contrib/ntp/ntpd/ntp_io.c

   1 /*
   2  * ntp_io.c - input/output routines for ntpd.   The socket-opening code
   3  *                 was shamelessly stolen from ntpd.
   4  */
   5
   6 #ifdef HAVE_CONFIG_H
   7 # include <config.h>
   8 #endif
   9
  10 #include <stdio.h>
  11 #include <signal.h>
  12 #ifdef HAVE_FNMATCH_H
  13 # include <fnmatch.h>
  14 # if !defined(FNM_CASEFOLD) && defined(FNM_IGNORECASE)
  15 #  define FNM_CASEFOLD FNM_IGNORECASE
  16 # endif
  17 #endif
  18 #ifdef HAVE_SYS_PARAM_H
  19 # include <sys/param.h>
  20 #endif
  21 #ifdef HAVE_SYS_IOCTL_H
  22 # include <sys/ioctl.h>
  23 #endif
  24 #ifdef HAVE_SYS_SOCKIO_H        /* UXPV: SIOC* #defines (Frank Vance <fvance@waii.com>) */
  25 # include <sys/sockio.h>
  26 #endif
  27 #ifdef HAVE_SYS_UIO_H
  28 # include <sys/uio.h>
  29 #endif
  30
  31 #include "ntp_machine.h"
  32 #include "ntpd.h"
  33 #include "ntp_io.h"
  34 #include "iosignal.h"
  35 #include "ntp_lists.h"
  36 #include "ntp_refclock.h"
  37 #include "ntp_stdlib.h"
  38 #include "ntp_worker.h"
  39 #include "ntp_request.h"
  40 #include "ntp_assert.h"
  41 #include "timevalops.h"
  42 #include "timespecops.h"
  43 #include "ntpd-opts.h"
  44 #include "safecast.h"
  45
  46 /* Don't include ISC's version of IPv6 variables and structures */
  47 #define ISC_IPV6_H 1
  48 #include <isc/mem.h>
  49 #include <isc/interfaceiter.h>
  50 #include <isc/netaddr.h>
  51 #include <isc/result.h>
  52 #include <isc/sockaddr.h>
  53
  54 #ifdef SIM
  55 #include "ntpsim.h"
  56 #endif
  57
  58 #ifdef HAS_ROUTING_SOCKET
  59 # include <net/route.h>
  60 # ifdef HAVE_RTNETLINK
  61 #  include <linux/rtnetlink.h>
  62 # endif
  63 #endif
  64
  65 /*
  66  * setsockopt does not always have the same arg declaration
  67  * across all platforms. If it's not defined we make it empty
  68  */
  69
  70 #ifndef SETSOCKOPT_ARG_CAST
  71 #define SETSOCKOPT_ARG_CAST
  72 #endif
  73
  74 extern int listen_to_virtual_ips;
  75
  76 #ifndef IPTOS_DSCP_EF
  77 #define IPTOS_DSCP_EF 0xb8
  78 #endif
  79 int qos = IPTOS_DSCP_EF;        /* QoS RFC3246 */
  80
  81 #ifdef LEAP_SMEAR
  82 /* TODO burnicki: This should be moved to ntp_timer.c, but if we do so
  83  * we get a linker error. Since we're running out of time before the leap
  84  * second occurs, we let it here where it just works.
  85  */
  86 int leap_smear_intv;
  87 #endif
  88
  89 /*
  90  * NIC rule entry
  91  */
  92 typedef struct nic_rule_tag nic_rule;
  93
  94 struct nic_rule_tag {
  95         nic_rule *      next;
  96         nic_rule_action action;
  97         nic_rule_match  match_type;
  98         char *          if_name;
  99         sockaddr_u      addr;
 100         int             prefixlen;
 101 };
 102
 103 /*
 104  * NIC rule listhead.  Entries are added at the head so that the first
 105  * match in the list is the last matching rule specified.
 106  */
 107 nic_rule *nic_rule_list;
 108
 109
 110 #if defined(SO_BINTIME) && defined(SCM_BINTIME) && defined(CMSG_FIRSTHDR)
 111 #  define HAVE_PACKET_TIMESTAMP
 112 #  define HAVE_BINTIME
 113 #  ifdef BINTIME_CTLMSGBUF_SIZE
 114 #   define CMSG_BUFSIZE BINTIME_CTLMSGBUF_SIZE
 115 #  else
 116 #   define CMSG_BUFSIZE  1536 /* moderate default */
 117 #  endif
 118 #elif defined(SO_TIMESTAMPNS) && defined(SCM_TIMESTAMPNS) && defined(CMSG_FIRSTHDR)
 119 #  define HAVE_PACKET_TIMESTAMP
 120 #  define HAVE_TIMESTAMPNS
 121 #  ifdef TIMESTAMPNS_CTLMSGBUF_SIZE
 122 #   define CMSG_BUFSIZE TIMESTAMPNS_CTLMSGBUF_SIZE
 123 #  else
 124 #   define CMSG_BUFSIZE  1536 /* moderate default */
 125 #  endif
 126 #elif defined(SO_TIMESTAMP) && defined(SCM_TIMESTAMP) && defined(CMSG_FIRSTHDR)
 127 #  define HAVE_PACKET_TIMESTAMP
 128 #  define HAVE_TIMESTAMP
 129 #  ifdef TIMESTAMP_CTLMSGBUF_SIZE
 130 #   define CMSG_BUFSIZE TIMESTAMP_CTLMSGBUF_SIZE
 131 #  else
 132 #   define CMSG_BUFSIZE  1536 /* moderate default */
 133 #  endif
 134 #else
 135 /* fill in for old/other timestamp interfaces */
 136 #endif
 137
 138 #if defined(SYS_WINNT)
 139 #include "win32_io.h"
 140 #include <isc/win32os.h>
 141 #endif
 142
 143 /*
 144  * We do asynchronous input using the SIGIO facility.  A number of
 145  * recvbuf buffers are preallocated for input.  In the signal
 146  * handler we poll to see which sockets are ready and read the
 147  * packets from them into the recvbuf's along with a time stamp and
 148  * an indication of the source host and the interface it was received
 149  * through.  This allows us to get as accurate receive time stamps
 150  * as possible independent of other processing going on.
 151  *
 152  * We watch the number of recvbufs available to the signal handler
 153  * and allocate more when this number drops below the low water
 154  * mark.  If the signal handler should run out of buffers in the
 155  * interim it will drop incoming frames, the idea being that it is
 156  * better to drop a packet than to be inaccurate.
 157  */
 158
 159
 160 /*
 161  * Other statistics of possible interest
 162  */
 163 volatile u_long packets_dropped;        /* total number of packets dropped on reception */
 164 volatile u_long packets_ignored;        /* packets received on wild card interface */
 165 volatile u_long packets_received;       /* total number of packets received */
 166          u_long packets_sent;           /* total number of packets sent */
 167          u_long packets_notsent;        /* total number of packets which couldn't be sent */
 168
 169 volatile u_long handler_calls;  /* number of calls to interrupt handler */
 170 volatile u_long handler_pkts;   /* number of pkts received by handler */
 171 u_long io_timereset;            /* time counters were reset */
 172
 173 /*
 174  * Interface stuff
 175  */
 176 endpt * any_interface;          /* wildcard ipv4 interface */
 177 endpt * any6_interface;         /* wildcard ipv6 interface */
 178 endpt * loopback_interface;     /* loopback ipv4 interface */
 179
 180 isc_boolean_t broadcast_client_enabled; /* is broadcast client enabled */
 181 u_int sys_ifnum;                        /* next .ifnum to assign */
 182 int ninterfaces;                        /* Total number of interfaces */
 183
 184 int disable_dynamic_updates;            /* scan interfaces once only */
 185
 186 #ifdef REFCLOCK
 187 /*
 188  * Refclock stuff.      We keep a chain of structures with data concerning
 189  * the guys we are doing I/O for.
 190  */
 191 static  struct refclockio *refio;
 192 #endif /* REFCLOCK */
 193
 194 /*
 195  * File descriptor masks etc. for call to select
 196  * Not needed for I/O Completion Ports or anything outside this file
 197  */
 198 static fd_set activefds;
 199 static int maxactivefd;
 200
 201 /*
 202  * bit alternating value to detect verified interfaces during an update cycle
 203  */
 204 static  u_short         sys_interphase = 0;
 205
 206 static endpt *  new_interface(endpt *);
 207 static void     add_interface(endpt *);
 208 static int      update_interfaces(u_short, interface_receiver_t,
 209                                   void *);
 210 static void     remove_interface(endpt *);
 211 static endpt *  create_interface(u_short, endpt *);
 212
 213 static int      is_wildcard_addr        (const sockaddr_u *);
 214
 215 /*
 216  * Multicast functions
 217  */
 218 static  isc_boolean_t   addr_ismulticast        (sockaddr_u *);
 219 static  isc_boolean_t   is_anycast              (sockaddr_u *,
 220                                                  const char *);
 221
 222 /*
 223  * Not all platforms support multicast
 224  */
 225 #ifdef MCAST
 226 static  isc_boolean_t   socket_multicast_enable (endpt *, sockaddr_u *);
 227 static  isc_boolean_t   socket_multicast_disable(endpt *, sockaddr_u *);
 228 #endif
 229
 230 #ifdef DEBUG
 231 static void interface_dump      (const endpt *);
 232 static void sockaddr_dump       (const sockaddr_u *);
 233 static void print_interface     (const endpt *, const char *, const char *);
 234 #define DPRINT_INTERFACE(level, args) do { if (debug >= (level)) { print_interface args; } } while (0)
 235 #else
 236 #define DPRINT_INTERFACE(level, args) do {} while (0)
 237 #endif
 238
 239 typedef struct vsock vsock_t;
 240 enum desc_type { FD_TYPE_SOCKET, FD_TYPE_FILE };
 241
 242 struct vsock {
 243         vsock_t *       link;
 244         SOCKET          fd;
 245         enum desc_type  type;
 246 };
 247
 248 vsock_t *fd_list;
 249
 250 #if !defined(HAVE_IO_COMPLETION_PORT) && defined(HAS_ROUTING_SOCKET)
 251 /*
 252  * async notification processing (e. g. routing sockets)
 253  */
 254 /*
 255  * support for receiving data on fd that is not a refclock or a socket
 256  * like e. g. routing sockets
 257  */
 258 struct asyncio_reader {
 259         struct asyncio_reader *link;                /* the list this is being kept in */
 260         SOCKET fd;                                  /* fd to be read */
 261         void  *data;                                /* possibly local data */
 262         void (*receiver)(struct asyncio_reader *);  /* input handler */
 263 };
 264
 265 struct asyncio_reader *asyncio_reader_list;
 266
 267 static void delete_asyncio_reader (struct asyncio_reader *);
 268 static struct asyncio_reader *new_asyncio_reader (void);
 269 static void add_asyncio_reader (struct asyncio_reader *, enum desc_type);
 270 static void remove_asyncio_reader (struct asyncio_reader *);
 271
 272 #endif /* !defined(HAVE_IO_COMPLETION_PORT) && defined(HAS_ROUTING_SOCKET) */
 273
 274 static void init_async_notifications (void);
 275
 276 static  int     addr_eqprefix   (const sockaddr_u *, const sockaddr_u *,
 277                                  int);
 278 static int      addr_samesubnet (const sockaddr_u *, const sockaddr_u *,
 279                                  const sockaddr_u *, const sockaddr_u *);
 280 static  int     create_sockets  (u_short);
 281 static  SOCKET  open_socket     (sockaddr_u *, int, int, endpt *);
 282 static  void    set_reuseaddr   (int);
 283 static  isc_boolean_t   socket_broadcast_enable  (struct interface *, SOCKET, sockaddr_u *);
 284
 285 #if !defined(HAVE_IO_COMPLETION_PORT) && !defined(HAVE_SIGNALED_IO)
 286 static  char *  fdbits          (int, const fd_set *);
 287 #endif
 288 #ifdef  OS_MISSES_SPECIFIC_ROUTE_UPDATES
 289 static  isc_boolean_t   socket_broadcast_disable (struct interface *, sockaddr_u *);
 290 #endif
 291
 292 typedef struct remaddr remaddr_t;
 293
 294 struct remaddr {
 295         remaddr_t *             link;
 296         sockaddr_u              addr;
 297         endpt *                 ep;
 298 };
 299
 300 remaddr_t *     remoteaddr_list;
 301 endpt *         ep_list;        /* complete endpt list */
 302 endpt *         mc4_list;       /* IPv4 mcast-capable unicast endpts */
 303 endpt *         mc6_list;       /* IPv6 mcast-capable unicast endpts */
 304
 305 static endpt *  wildipv4;
 306 static endpt *  wildipv6;
 307
 308 #ifdef SYS_WINNT
 309 int accept_wildcard_if_for_winnt;
 310 #else
 311 const int accept_wildcard_if_for_winnt = FALSE;
 312 #endif
 313
 314 static void     add_fd_to_list          (SOCKET, enum desc_type);
 315 static endpt *  find_addr_in_list       (sockaddr_u *);
 316 static endpt *  find_flagged_addr_in_list(sockaddr_u *, u_int32);
 317 static void     delete_addr_from_list   (sockaddr_u *);
 318 static void     delete_interface_from_list(endpt *);
 319 static void     close_and_delete_fd_from_list(SOCKET);
 320 static void     add_addr_to_list        (sockaddr_u *, endpt *);
 321 static void     create_wildcards        (u_short);
 322 static endpt *  findlocalinterface      (sockaddr_u *, int, int);
 323 static endpt *  findclosestinterface    (sockaddr_u *, int);
 324 #ifdef DEBUG
 325 static const char *     action_text     (nic_rule_action);
 326 #endif
 327 static nic_rule_action  interface_action(char *, sockaddr_u *, u_int32);
 328 static void             convert_isc_if  (isc_interface_t *,
 329                                          endpt *, u_short);
 330 static void             calc_addr_distance(sockaddr_u *,
 331                                            const sockaddr_u *,
 332                                            const sockaddr_u *);
 333 static int              cmp_addr_distance(const sockaddr_u *,
 334                                           const sockaddr_u *);
 335
 336 /*
 337  * Routines to read the ntp packets
 338  */
 339 #if !defined(HAVE_IO_COMPLETION_PORT)
 340 static inline int       read_network_packet     (SOCKET, struct interface *, l_fp);
 341 static void             ntpd_addremove_io_fd    (int, int, int);
 342 static void             input_handler_scan      (const l_fp*, const fd_set*);
 343 static int/*BOOL*/      sanitize_fdset          (int errc);
 344 #ifdef REFCLOCK
 345 static inline int       read_refclock_packet    (SOCKET, struct refclockio *, l_fp);
 346 #endif
 347 #ifdef HAVE_SIGNALED_IO
 348 static void             input_handler           (l_fp*);
 349 #endif
 350 #endif
 351
 352
 353 #ifndef HAVE_IO_COMPLETION_PORT
 354 void
 355 maintain_activefds(
 356         int fd,
 357         int closing
 358         )
 359 {
 360         int i;
 361
 362         if (fd < 0 || fd >= FD_SETSIZE) {
 363                 msyslog(LOG_ERR,
 364                         "Too many sockets in use, FD_SETSIZE %d exceeded by fd %d",
 365                         FD_SETSIZE, fd);
 366                 exit(1);
 367         }
 368
 369         if (!closing) {
 370                 FD_SET(fd, &activefds);
 371                 maxactivefd = max(fd, maxactivefd);
 372         } else {
 373                 FD_CLR(fd, &activefds);
 374                 if (maxactivefd && fd == maxactivefd) {
 375                         for (i = maxactivefd - 1; i >= 0; i--)
 376                                 if (FD_ISSET(i, &activefds)) {
 377                                         maxactivefd = i;
 378                                         break;
 379                                 }
 380                         INSIST(fd != maxactivefd);
 381                 }
 382         }
 383 }
 384 #endif  /* !HAVE_IO_COMPLETION_PORT */
 385
 386
 387 #ifdef DEBUG_TIMING
 388 /*
 389  * collect timing information for various processing
 390  * paths. currently we only pass them on to the file
 391  * for later processing. this could also do histogram
 392  * based analysis in other to reduce the load (and skew)
 393  * dur to the file output
 394  */
 395 void
 396 collect_timing(struct recvbuf *rb, const char *tag, int count, l_fp *dts)
 397 {
 398         char buf[256];
 399
 400         snprintf(buf, sizeof(buf), "%s %d %s %s",
 401                  (rb != NULL)
 402                      ? ((rb->dstadr != NULL)
 403                             ? stoa(&rb->recv_srcadr)
 404                             : "-REFCLOCK-")
 405                      : "-",
 406                  count, lfptoa(dts, 9), tag);
 407         record_timing_stats(buf);
 408 }
 409 #endif
 410
 411 /*
 412  * About dynamic interfaces, sockets, reception and more...
 413  *
 414  * the code solves following tasks:
 415  *
 416  *   - keep a current list of active interfaces in order
 417  *     to bind to to the interface address on NTP_PORT so that
 418  *     all wild and specific bindings for NTP_PORT are taken by ntpd
 419  *     to avoid other daemons messing with the time or sockets.
 420  *   - all interfaces keep a list of peers that are referencing
 421  *     the interface in order to quickly re-assign the peers to
 422  *     new interface in case an interface is deleted (=> gone from system or
 423  *     down)
 424  *   - have a preconfigured socket ready with the right local address
 425  *     for transmission and reception
 426  *   - have an address list for all destination addresses used within ntpd
 427  *     to find the "right" preconfigured socket.
 428  *   - facilitate updating the internal interface list with respect to
 429  *     the current kernel state
 430  *
 431  * special issues:
 432  *
 433  *   - mapping of multicast addresses to the interface affected is not always
 434  *     one to one - especially on hosts with multiple interfaces
 435  *     the code here currently allocates a separate interface entry for those
 436  *     multicast addresses
 437  *     iff it is able to bind to a *new* socket with the multicast address (flags |= MCASTIF)
 438  *     in case of failure the multicast address is bound to an existing interface.
 439  *   - on some systems it is perfectly legal to assign the same address to
 440  *     multiple interfaces. Therefore this code does not keep a list of interfaces
 441  *     but a list of interfaces that represent a unique address as determined by the kernel
 442  *     by the procedure in findlocalinterface. Thus it is perfectly legal to see only
 443  *     one representative of a group of real interfaces if they share the same address.
 444  *
 445  * Frank Kardel 20050910
 446  */
 447
 448 /*
 449  * init_io - initialize I/O module.
 450  */
 451 void
 452 init_io(void)
 453 {
 454         /* Init buffer free list and stat counters */
 455         init_recvbuff(RECV_INIT);
 456         /* update interface every 5 minutes as default */
 457         interface_interval = 300;
 458
 459 #ifdef WORK_PIPE
 460         addremove_io_fd = &ntpd_addremove_io_fd;
 461 #endif
 462
 463 #if defined(SYS_WINNT)
 464         init_io_completion_port();
 465 #elif defined(HAVE_SIGNALED_IO)
 466         (void) set_signal(input_handler);
 467 #endif
 468 }
 469
 470
 471 static void
 472 ntpd_addremove_io_fd(
 473         int     fd,
 474         int     is_pipe,
 475         int     remove_it
 476         )
 477 {
 478         UNUSED_ARG(is_pipe);
 479
 480 #ifdef HAVE_SIGNALED_IO
 481         if (!remove_it)
 482                 init_socket_sig(fd);
 483 #endif /* not HAVE_SIGNALED_IO */
 484
 485         maintain_activefds(fd, remove_it);
 486 }
 487
 488
 489 /*
 490  * io_open_sockets - call socket creation routine
 491  */
 492 void
 493 io_open_sockets(void)
 494 {
 495         static int already_opened;
 496
 497         if (already_opened || HAVE_OPT( SAVECONFIGQUIT ))
 498                 return;
 499
 500         already_opened = 1;
 501
 502         /*
 503          * Create the sockets
 504          */
 505         BLOCKIO();
 506         create_sockets(NTP_PORT);
 507         UNBLOCKIO();
 508
 509         init_async_notifications();
 510
 511         DPRINTF(3, ("io_open_sockets: maxactivefd %d\n", maxactivefd));
 512 }
 513
 514
 515 #ifdef DEBUG
 516 /*
 517  * function to dump the contents of the interface structure
 518  * for debugging use only.
 519  * We face a dilemma here -- sockets are FDs under POSIX and
 520  * actually HANDLES under Windows. So we use '%lld' as format
 521  * and cast the value to 'long long'; this should not hurt
 522  * with UNIX-like systems and does not truncate values on Win64.
 523  */
 524 void
 525 interface_dump(const endpt *itf)
 526 {
 527         printf("Dumping interface: %p\n", itf);
 528         printf("fd = %lld\n", (long long)itf->fd);
 529         printf("bfd = %lld\n", (long long)itf->bfd);
 530         printf("sin = %s,\n", stoa(&itf->sin));
 531         sockaddr_dump(&itf->sin);
 532         printf("bcast = %s,\n", stoa(&itf->bcast));
 533         sockaddr_dump(&itf->bcast);
 534         printf("mask = %s,\n", stoa(&itf->mask));
 535         sockaddr_dump(&itf->mask);
 536         printf("name = %s\n", itf->name);
 537         printf("flags = 0x%08x\n", itf->flags);
 538         printf("last_ttl = %d\n", itf->last_ttl);
 539         printf("addr_refid = %08x\n", itf->addr_refid);
 540         printf("num_mcast = %d\n", itf->num_mcast);
 541         printf("received = %ld\n", itf->received);
 542         printf("sent = %ld\n", itf->sent);
 543         printf("notsent = %ld\n", itf->notsent);
 544         printf("ifindex = %u\n", itf->ifindex);
 545         printf("peercnt = %u\n", itf->peercnt);
 546         printf("phase = %u\n", itf->phase);
 547 }
 548
 549 /*
 550  * sockaddr_dump - hex dump the start of a sockaddr_u
 551  */
 552 static void
 553 sockaddr_dump(const sockaddr_u *psau)
 554 {
 555         /* Limit the size of the sockaddr_in6 hex dump */
 556         const int maxsize = min(32, sizeof(psau->sa6));
 557         const u_char *  cp;
 558         int             i;
 559
 560         /* XXX: Should we limit maxsize based on psau->saX.sin_family? */
 561         cp = (const void *)&psau->sa6;
 562
 563         for(i = 0; i < maxsize; i++) {
 564                 printf("%02x", *cp++);
 565                 if (!((i + 1) % 4))
 566                         printf(" ");
 567         }
 568         printf("\n");
 569 }
 570
 571 /*
 572  * print_interface - helper to output debug information
 573  */
 574 static void
 575 print_interface(const endpt *iface, const char *pfx, const char *sfx)
 576 {
 577         printf("%sinterface #%d: fd=%lld, bfd=%lld, name=%s, flags=0x%x, ifindex=%u, sin=%s",
 578                pfx,
 579                iface->ifnum,
 580                (long long)iface->fd,
 581                (long long)iface->bfd,
 582                iface->name,
 583                iface->flags,
 584                iface->ifindex,
 585                stoa(&iface->sin));
 586         if (AF_INET == iface->family) {
 587                 if (iface->flags & INT_BROADCAST)
 588                         printf(", bcast=%s", stoa(&iface->bcast));
 589                 printf(", mask=%s", stoa(&iface->mask));
 590         }
 591         printf(", %s:%s",
 592                (iface->ignore_packets)
 593                    ? "Disabled"
 594                    : "Enabled",
 595                sfx);
 596         if (debug > 4)  /* in-depth debugging only */
 597                 interface_dump(iface);
 598 }
 599 #endif
 600
 601 #if !defined(HAVE_IO_COMPLETION_PORT) && defined(HAS_ROUTING_SOCKET)
 602 /*
 603  * create an asyncio_reader structure
 604  */
 605 static struct asyncio_reader *
 606 new_asyncio_reader(void)
 607 {
 608         struct asyncio_reader *reader;
 609
 610         reader = emalloc_zero(sizeof(*reader));
 611         reader->fd = INVALID_SOCKET;
 612
 613         return reader;
 614 }
 615
 616 /*
 617  * delete a reader
 618  */
 619 static void
 620 delete_asyncio_reader(
 621         struct asyncio_reader *reader
 622         )
 623 {
 624         free(reader);
 625 }
 626
 627 /*
 628  * add asynchio_reader
 629  */
 630 static void
 631 add_asyncio_reader(
 632         struct asyncio_reader * reader,
 633         enum desc_type          type)
 634 {
 635         LINK_SLIST(asyncio_reader_list, reader, link);
 636         add_fd_to_list(reader->fd, type);
 637 }
 638
 639 /*
 640  * remove asynchio_reader
 641  */
 642 static void
 643 remove_asyncio_reader(
 644         struct asyncio_reader *reader
 645         )
 646 {
 647         struct asyncio_reader *unlinked;
 648
 649         UNLINK_SLIST(unlinked, asyncio_reader_list, reader, link,
 650             struct asyncio_reader);
 651
 652         if (reader->fd != INVALID_SOCKET)
 653                 close_and_delete_fd_from_list(reader->fd);
 654
 655         reader->fd = INVALID_SOCKET;
 656 }
 657 #endif /* !defined(HAVE_IO_COMPLETION_PORT) && defined(HAS_ROUTING_SOCKET) */
 658
 659
 660 /* compare two sockaddr prefixes */
 661 static int
 662 addr_eqprefix(
 663         const sockaddr_u *      a,
 664         const sockaddr_u *      b,
 665         int                     prefixlen
 666         )
 667 {
 668         isc_netaddr_t           isc_a;
 669         isc_netaddr_t           isc_b;
 670         isc_sockaddr_t          isc_sa;
 671
 672         ZERO(isc_sa);
 673         memcpy(&isc_sa.type, a, min(sizeof(isc_sa.type), sizeof(*a)));
 674         isc_netaddr_fromsockaddr(&isc_a, &isc_sa);
 675
 676         ZERO(isc_sa);
 677         memcpy(&isc_sa.type, b, min(sizeof(isc_sa.type), sizeof(*b)));
 678         isc_netaddr_fromsockaddr(&isc_b, &isc_sa);
 679
 680         return (int)isc_netaddr_eqprefix(&isc_a, &isc_b,
 681                                          (u_int)prefixlen);
 682 }
 683
 684
 685 static int
 686 addr_samesubnet(
 687         const sockaddr_u *      a,
 688         const sockaddr_u *      a_mask,
 689         const sockaddr_u *      b,
 690         const sockaddr_u *      b_mask
 691         )
 692 {
 693         const u_int32 * pa;
 694         const u_int32 * pa_limit;
 695         const u_int32 * pb;
 696         const u_int32 * pm;
 697         size_t          loops;
 698
 699         REQUIRE(AF(a) == AF(a_mask));
 700         REQUIRE(AF(b) == AF(b_mask));
 701         /*
 702          * With address and mask families verified to match, comparing
 703          * the masks also validates the address's families match.
 704          */
 705         if (!SOCK_EQ(a_mask, b_mask))
 706                 return FALSE;
 707
 708         if (IS_IPV6(a)) {
 709                 loops = sizeof(NSRCADR6(a)) / sizeof(*pa);
 710                 pa = (const void *)&NSRCADR6(a);
 711                 pb = (const void *)&NSRCADR6(b);
 712                 pm = (const void *)&NSRCADR6(a_mask);
 713         } else {
 714                 loops = sizeof(NSRCADR(a)) / sizeof(*pa);
 715                 pa = (const void *)&NSRCADR(a);
 716                 pb = (const void *)&NSRCADR(b);
 717                 pm = (const void *)&NSRCADR(a_mask);
 718         }
 719         for (pa_limit = pa + loops; pa < pa_limit; pa++, pb++, pm++)
 720                 if ((*pa & *pm) != (*pb & *pm))
 721                         return FALSE;
 722
 723         return TRUE;
 724 }
 725
 726
 727 /*
 728  * interface list enumerator - visitor pattern
 729  */
 730 void
 731 interface_enumerate(
 732         interface_receiver_t    receiver,
 733         void *                  data
 734         )
 735 {
 736         interface_info_t ifi;
 737
 738         ifi.action = IFS_EXISTS;
 739         for (ifi.ep = ep_list; ifi.ep != NULL; ifi.ep = ifi.ep->elink)
 740                 (*receiver)(data, &ifi);
 741 }
 742
 743 /*
 744  * do standard initialization of interface structure
 745  */
 746 static void
 747 init_interface(
 748         endpt *ep
 749         )
 750 {
 751         ZERO(*ep);
 752         ep->fd = INVALID_SOCKET;
 753         ep->bfd = INVALID_SOCKET;
 754         ep->phase = sys_interphase;
 755 }
 756
 757
 758 /*
 759  * create new interface structure initialize from
 760  * template structure or via standard initialization
 761  * function
 762  */
 763 static struct interface *
 764 new_interface(
 765         struct interface *interface
 766         )
 767 {
 768         struct interface *      iface;
 769
 770         iface = emalloc(sizeof(*iface));
 771
 772         if (NULL == interface)
 773                 init_interface(iface);
 774         else                            /* use the template */
 775                 memcpy(iface, interface, sizeof(*iface));
 776
 777         /* count every new instance of an interface in the system */
 778         iface->ifnum = sys_ifnum++;
 779         iface->starttime = current_time;
 780
 781 #   ifdef HAVE_IO_COMPLETION_PORT
 782         if (!io_completion_port_add_interface(iface)) {
 783                 msyslog(LOG_EMERG, "cannot register interface with IO engine -- will exit now");
 784                 exit(1);
 785         }
 786 #   endif
 787         return iface;
 788 }
 789
 790
 791 /*
 792  * return interface storage into free memory pool
 793  */
 794 static void
 795 delete_interface(
 796         endpt *ep
 797         )
 798 {
 799 #    ifdef HAVE_IO_COMPLETION_PORT
 800         io_completion_port_remove_interface(ep);
 801 #    endif
 802         free(ep);
 803 }
 804
 805
 806 /*
 807  * link interface into list of known interfaces
 808  */
 809 static void
 810 add_interface(
 811         endpt * ep
 812         )
 813 {
 814         endpt **        pmclisthead;
 815         endpt *         scan;
 816         endpt *         scan_next;
 817         endpt *         unlinked;
 818         sockaddr_u *    addr;
 819         int             ep_local;
 820         int             scan_local;
 821         int             same_subnet;
 822         int             ep_univ_iid;    /* iface ID from MAC address */
 823         int             scan_univ_iid;  /* see RFC 4291 */
 824         int             ep_privacy;     /* random local iface ID */
 825         int             scan_privacy;   /* see RFC 4941 */
 826         int             rc;
 827
 828         /* Calculate the refid */
 829         ep->addr_refid = addr2refid(&ep->sin);
 830         /* link at tail so ntpdc -c ifstats index increases each row */
 831         LINK_TAIL_SLIST(ep_list, ep, elink, endpt);
 832         ninterfaces++;
 833 #ifdef MCAST
 834         /* the rest is for enabled multicast-capable addresses only */
 835         if (ep->ignore_packets || !(INT_MULTICAST & ep->flags) ||
 836             INT_LOOPBACK & ep->flags)
 837                 return;
 838 # ifndef INCLUDE_IPV6_MULTICAST_SUPPORT
 839         if (AF_INET6 == ep->family)
 840                 return;
 841 # endif
 842         pmclisthead = (AF_INET == ep->family)
 843                          ? &mc4_list
 844                          : &mc6_list;
 845
 846         if (AF_INET6 == ep->family) {
 847                 ep_local =
 848                     IN6_IS_ADDR_LINKLOCAL(PSOCK_ADDR6(&ep->sin)) ||
 849                     IN6_IS_ADDR_SITELOCAL(PSOCK_ADDR6(&ep->sin));
 850                 ep_univ_iid = IS_IID_UNIV(&ep->sin);
 851                 ep_privacy = !!(INT_PRIVACY & ep->flags);
 852         } else {
 853                 ep_local = FALSE;
 854                 ep_univ_iid = FALSE;
 855                 ep_privacy = FALSE;
 856         }
 857         DPRINTF(4, ("add_interface mcast-capable %s%s%s%s\n",
 858                     stoa(&ep->sin),
 859                     (ep_local) ? " link/scope-local" : "",
 860                     (ep_univ_iid) ? " univ-IID" : "",
 861                     (ep_privacy) ? " privacy" : ""));
 862         /*
 863          * If we have multiple local addresses on the same network
 864          * interface, and some are link- or site-local, do not multicast
 865          * out from the link-/site-local addresses by default, to avoid
 866          * duplicate manycastclient associations between v6 peers using
 867          * link-local and global addresses.  link-local can still be
 868          * chosen using "nic ignore myv6globalprefix::/64".
 869          * Similarly, if we have multiple global addresses from the same
 870          * prefix on the same network interface, multicast from one,
 871          * preferring EUI-64, then static, then least RFC 4941 privacy
 872          * addresses.
 873          */
 874         for (scan = *pmclisthead; scan != NULL; scan = scan_next) {
 875                 scan_next = scan->mclink;
 876                 if (ep->family != scan->family)
 877                         continue;
 878                 if (strcmp(ep->name, scan->name))
 879                         continue;
 880                 same_subnet = addr_samesubnet(&ep->sin, &ep->mask,
 881                                               &scan->sin, &scan->mask);
 882                 if (AF_INET6 == ep->family) {
 883                         addr = &scan->sin;
 884                         scan_local =
 885                             IN6_IS_ADDR_LINKLOCAL(PSOCK_ADDR6(addr)) ||
 886                             IN6_IS_ADDR_SITELOCAL(PSOCK_ADDR6(addr));
 887                         scan_univ_iid = IS_IID_UNIV(addr);
 888                         scan_privacy = !!(INT_PRIVACY & scan->flags);
 889                 } else {
 890                         scan_local = FALSE;
 891                         scan_univ_iid = FALSE;
 892                         scan_privacy = FALSE;
 893                 }
 894                 DPRINTF(4, ("add_interface mcast-capable scan %s%s%s%s\n",
 895                             stoa(&scan->sin),
 896                             (scan_local) ? " link/scope-local" : "",
 897                             (scan_univ_iid) ? " univ-IID" : "",
 898                             (scan_privacy) ? " privacy" : ""));
 899                 if ((ep_local && !scan_local) || (same_subnet &&
 900                     ((ep_privacy && !scan_privacy) ||
 901                      (!ep_univ_iid && scan_univ_iid)))) {
 902                         DPRINTF(4, ("did not add %s to %s of IPv6 multicast-capable list which already has %s\n",
 903                                 stoa(&ep->sin),
 904                                 (ep_local)
 905                                     ? "tail"
 906                                     : "head",
 907                                 stoa(&scan->sin)));
 908                         return;
 909                 }
 910                 if ((scan_local && !ep_local) || (same_subnet &&
 911                     ((scan_privacy && !ep_privacy) ||
 912                      (!scan_univ_iid && ep_univ_iid)))) {
 913                         UNLINK_SLIST(unlinked, *pmclisthead,
 914                                      scan, mclink, endpt);
 915                         DPRINTF(4, ("%s %s from IPv6 multicast-capable list to add %s\n",
 916                                 (unlinked != scan)
 917                                     ? "Failed to remove"
 918                                     : "removed",
 919                                 stoa(&scan->sin), stoa(&ep->sin)));
 920                 }
 921         }
 922         /*
 923          * Add link/site local at the tail of the multicast-
 924          * capable unicast interfaces list, so that ntpd will
 925          * send from global addresses before link-/site-local
 926          * ones.
 927          */
 928         if (ep_local)
 929                 LINK_TAIL_SLIST(*pmclisthead, ep, mclink, endpt);
 930         else
 931                 LINK_SLIST(*pmclisthead, ep, mclink);
 932         DPRINTF(4, ("added %s to %s of IPv%s multicast-capable unicast local address list\n",
 933                 stoa(&ep->sin),
 934                 (ep_local)
 935                     ? "tail"
 936                     : "head",
 937                 (AF_INET == ep->family)
 938                     ? "4"
 939                     : "6"));
 940
 941         if (INVALID_SOCKET == ep->fd)
 942                 return;
 943
 944         /*
 945          * select the local address from which to send to multicast.
 946          */
 947         switch (AF(&ep->sin)) {
 948
 949         case AF_INET :
 950                 rc = setsockopt(ep->fd, IPPROTO_IP,
 951                                 IP_MULTICAST_IF,
 952                                 (void *)&NSRCADR(&ep->sin),
 953                                 sizeof(NSRCADR(&ep->sin)));
 954                 if (rc)
 955                         msyslog(LOG_ERR,
 956                                 "setsockopt IP_MULTICAST_IF %s fails: %m",
 957                                 stoa(&ep->sin));
 958                 break;
 959
 960 # ifdef INCLUDE_IPV6_MULTICAST_SUPPORT
 961         case AF_INET6 :
 962                 rc = setsockopt(ep->fd, IPPROTO_IPV6,
 963                                  IPV6_MULTICAST_IF,
 964                                  (void *)&ep->ifindex,
 965                                  sizeof(ep->ifindex));
 966                 /* do not complain if bound addr scope is ifindex */
 967                 if (rc && ep->ifindex != SCOPE(&ep->sin))
 968                         msyslog(LOG_ERR,
 969                                 "setsockopt IPV6_MULTICAST_IF %u for %s fails: %m",
 970                                 ep->ifindex, stoa(&ep->sin));
 971                 break;
 972 # endif
 973         }
 974 #endif  /* MCAST */
 975 }
 976
 977
 978 /*
 979  * remove interface from known interface list and clean up
 980  * associated resources
 981  */
 982 static void
 983 remove_interface(
 984         endpt * ep
 985         )
 986 {
 987         endpt *         unlinked;
 988         endpt **        pmclisthead;
 989         sockaddr_u      resmask;
 990
 991         UNLINK_SLIST(unlinked, ep_list, ep, elink, endpt);
 992         if (!ep->ignore_packets && INT_MULTICAST & ep->flags) {
 993                 pmclisthead = (AF_INET == ep->family)
 994                                  ? &mc4_list
 995                                  : &mc6_list;
 996                 UNLINK_SLIST(unlinked, *pmclisthead, ep, mclink, endpt);
 997                 DPRINTF(4, ("%s %s IPv%s multicast-capable unicast local address list\n",
 998                         stoa(&ep->sin),
 999                         (unlinked != NULL)
1000                             ? "removed from"
1001                             : "not found on",
1002                         (AF_INET == ep->family)
1003                             ? "4"
1004                             : "6"));
1005         }
1006         delete_interface_from_list(ep);
1007
1008         if (ep->fd != INVALID_SOCKET) {
1009                 msyslog(LOG_INFO,
1010                         "Deleting interface #%d %s, %s#%d, interface stats: received=%ld, sent=%ld, dropped=%ld, active_time=%ld secs",
1011                         ep->ifnum,
1012                         ep->name,
1013                         stoa(&ep->sin),
1014                         SRCPORT(&ep->sin),
1015                         ep->received,
1016                         ep->sent,
1017                         ep->notsent,
1018                         current_time - ep->starttime);
1019 #           ifdef HAVE_IO_COMPLETION_PORT
1020                 io_completion_port_remove_socket(ep->fd, ep);
1021 #           endif
1022                 close_and_delete_fd_from_list(ep->fd);
1023                 ep->fd = INVALID_SOCKET;
1024         }
1025
1026         if (ep->bfd != INVALID_SOCKET) {
1027                 msyslog(LOG_INFO,
1028                         "stop listening for broadcasts to %s on interface #%d %s",
1029                         stoa(&ep->bcast), ep->ifnum, ep->name);
1030 #           ifdef HAVE_IO_COMPLETION_PORT
1031                 io_completion_port_remove_socket(ep->bfd, ep);
1032 #           endif
1033                 close_and_delete_fd_from_list(ep->bfd);
1034                 ep->bfd = INVALID_SOCKET;
1035         }
1036 #   ifdef HAVE_IO_COMPLETION_PORT
1037         io_completion_port_remove_interface(ep);
1038 #   endif
1039
1040         ninterfaces--;
1041         mon_clearinterface(ep);
1042
1043         /* remove restrict interface entry */
1044         SET_HOSTMASK(&resmask, AF(&ep->sin));
1045         hack_restrict(RESTRICT_REMOVEIF, &ep->sin, &resmask,
1046                       -3, RESM_NTPONLY | RESM_INTERFACE, RES_IGNORE, 0);
1047 }
1048
1049
1050 static void
1051 log_listen_address(
1052         endpt * ep
1053         )
1054 {
1055         msyslog(LOG_INFO, "%s on %d %s %s",
1056                 (ep->ignore_packets)
1057                     ? "Listen and drop"
1058                     : "Listen normally",
1059                 ep->ifnum,
1060                 ep->name,
1061                 sptoa(&ep->sin));
1062 }
1063
1064
1065 static void
1066 create_wildcards(
1067         u_short port
1068         )
1069 {
1070         int                     v4wild;
1071 #ifdef INCLUDE_IPV6_SUPPORT
1072         int                     v6wild;
1073 #endif
1074         sockaddr_u              wildaddr;
1075         nic_rule_action         action;
1076         struct interface *      wildif;
1077
1078         /*
1079          * silence "potentially uninitialized" warnings from VC9
1080          * failing to follow the logic.  Ideally action could remain
1081          * uninitialized, and the memset be the first statement under
1082          * the first if (v4wild).
1083          */
1084         action = ACTION_LISTEN;
1085         ZERO(wildaddr);
1086
1087 #ifdef INCLUDE_IPV6_SUPPORT
1088         /*
1089          * create pseudo-interface with wildcard IPv6 address
1090          */
1091         v6wild = ipv6_works;
1092         if (v6wild) {
1093                 /* set wildaddr to the v6 wildcard address :: */
1094                 ZERO(wildaddr);
1095                 AF(&wildaddr) = AF_INET6;
1096                 SET_ADDR6N(&wildaddr, in6addr_any);
1097                 SET_PORT(&wildaddr, port);
1098                 SET_SCOPE(&wildaddr, 0);
1099
1100                 /* check for interface/nic rules affecting the wildcard */
1101                 action = interface_action(NULL, &wildaddr, 0);
1102                 v6wild = (ACTION_IGNORE != action);
1103         }
1104         if (v6wild) {
1105                 wildif = new_interface(NULL);
1106
1107                 strlcpy(wildif->name, "v6wildcard", sizeof(wildif->name));
1108                 memcpy(&wildif->sin, &wildaddr, sizeof(wildif->sin));
1109                 wildif->family = AF_INET6;
1110                 AF(&wildif->mask) = AF_INET6;
1111                 SET_ONESMASK(&wildif->mask);
1112
1113                 wildif->flags = INT_UP | INT_WILDCARD;
1114                 wildif->ignore_packets = (ACTION_DROP == action);
1115
1116                 wildif->fd = open_socket(&wildif->sin, 0, 1, wildif);
1117
1118                 if (wildif->fd != INVALID_SOCKET) {
1119                         wildipv6 = wildif;
1120                         any6_interface = wildif;
1121                         add_addr_to_list(&wildif->sin, wildif);
1122                         add_interface(wildif);
1123                         log_listen_address(wildif);
1124                 } else {
1125                         msyslog(LOG_ERR,
1126                                 "unable to bind to wildcard address %s - another process may be running - EXITING",
1127                                 stoa(&wildif->sin));
1128                         exit(1);
1129                 }
1130                 DPRINT_INTERFACE(2, (wildif, "created ", "\n"));
1131         }
1132 #endif
1133
1134         /*
1135          * create pseudo-interface with wildcard IPv4 address
1136          */
1137         v4wild = ipv4_works;
1138         if (v4wild) {
1139                 /* set wildaddr to the v4 wildcard address 0.0.0.0 */
1140                 AF(&wildaddr) = AF_INET;
1141                 SET_ADDR4N(&wildaddr, INADDR_ANY);
1142                 SET_PORT(&wildaddr, port);
1143
1144                 /* check for interface/nic rules affecting the wildcard */
1145                 action = interface_action(NULL, &wildaddr, 0);
1146                 v4wild = (ACTION_IGNORE != action);
1147         }
1148         if (v4wild) {
1149                 wildif = new_interface(NULL);
1150
1151                 strlcpy(wildif->name, "v4wildcard", sizeof(wildif->name));
1152                 memcpy(&wildif->sin, &wildaddr, sizeof(wildif->sin));
1153                 wildif->family = AF_INET;
1154                 AF(&wildif->mask) = AF_INET;
1155                 SET_ONESMASK(&wildif->mask);
1156
1157                 wildif->flags = INT_BROADCAST | INT_UP | INT_WILDCARD;
1158                 wildif->ignore_packets = (ACTION_DROP == action);
1159 #if defined(MCAST)
1160                 /*
1161                  * enable multicast reception on the broadcast socket
1162                  */
1163                 AF(&wildif->bcast) = AF_INET;
1164                 SET_ADDR4N(&wildif->bcast, INADDR_ANY);
1165                 SET_PORT(&wildif->bcast, port);
1166 #endif /* MCAST */
1167                 wildif->fd = open_socket(&wildif->sin, 0, 1, wildif);
1168
1169                 if (wildif->fd != INVALID_SOCKET) {
1170                         wildipv4 = wildif;
1171                         any_interface = wildif;
1172
1173                         add_addr_to_list(&wildif->sin, wildif);
1174                         add_interface(wildif);
1175                         log_listen_address(wildif);
1176                 } else {
1177                         msyslog(LOG_ERR,
1178                                 "unable to bind to wildcard address %s - another process may be running - EXITING",
1179                                 stoa(&wildif->sin));
1180                         exit(1);
1181                 }
1182                 DPRINT_INTERFACE(2, (wildif, "created ", "\n"));
1183         }
1184 }
1185
1186
1187 /*
1188  * add_nic_rule() -- insert a rule entry at the head of nic_rule_list.
1189  */
1190 void
1191 add_nic_rule(
1192         nic_rule_match  match_type,
1193         const char *    if_name,        /* interface name or numeric address */
1194         int             prefixlen,
1195         nic_rule_action action
1196         )
1197 {
1198         nic_rule *      rule;
1199         isc_boolean_t   is_ip;
1200
1201         rule = emalloc_zero(sizeof(*rule));
1202         rule->match_type = match_type;
1203         rule->prefixlen = prefixlen;
1204         rule->action = action;
1205
1206         if (MATCH_IFNAME == match_type) {
1207                 REQUIRE(NULL != if_name);
1208                 rule->if_name = estrdup(if_name);
1209         } else if (MATCH_IFADDR == match_type) {
1210                 REQUIRE(NULL != if_name);
1211                 /* set rule->addr */
1212                 is_ip = is_ip_address(if_name, AF_UNSPEC, &rule->addr);
1213                 REQUIRE(is_ip);
1214         } else
1215                 REQUIRE(NULL == if_name);
1216
1217         LINK_SLIST(nic_rule_list, rule, next);
1218 }
1219
1220
1221 #ifdef DEBUG
1222 static const char *
1223 action_text(
1224         nic_rule_action action
1225         )
1226 {
1227         const char *t;
1228
1229         switch (action) {
1230
1231         default:
1232                 t = "ERROR";    /* quiet uninit warning */
1233                 DPRINTF(1, ("fatal: unknown nic_rule_action %d\n",
1234                             action));
1235                 ENSURE(0);
1236                 break;
1237
1238         case ACTION_LISTEN:
1239                 t = "listen";
1240                 break;
1241
1242         case ACTION_IGNORE:
1243                 t = "ignore";
1244                 break;
1245
1246         case ACTION_DROP:
1247                 t = "drop";
1248                 break;
1249         }
1250
1251         return t;
1252 }
1253 #endif  /* DEBUG */
1254
1255
1256 static nic_rule_action
1257 interface_action(
1258         char *          if_name,
1259         sockaddr_u *    if_addr,
1260         u_int32         if_flags
1261         )
1262 {
1263         nic_rule *      rule;
1264         int             isloopback;
1265         int             iswildcard;
1266
1267         DPRINTF(4, ("interface_action: interface %s ",
1268                     (if_name != NULL) ? if_name : "wildcard"));
1269
1270         iswildcard = is_wildcard_addr(if_addr);
1271         isloopback = !!(INT_LOOPBACK & if_flags);
1272
1273         /*
1274          * Find any matching NIC rule from --interface / -I or ntp.conf
1275          * interface/nic rules.
1276          */
1277         for (rule = nic_rule_list; rule != NULL; rule = rule->next) {
1278
1279                 switch (rule->match_type) {
1280
1281                 case MATCH_ALL:
1282                         /* loopback and wildcard excluded from "all" */
1283                         if (isloopback || iswildcard)
1284                                 break;
1285                         DPRINTF(4, ("nic all %s\n",
1286                             action_text(rule->action)));
1287                         return rule->action;
1288
1289                 case MATCH_IPV4:
1290                         if (IS_IPV4(if_addr)) {
1291                                 DPRINTF(4, ("nic ipv4 %s\n",
1292                                     action_text(rule->action)));
1293                                 return rule->action;
1294                         }
1295                         break;
1296
1297                 case MATCH_IPV6:
1298                         if (IS_IPV6(if_addr)) {
1299                                 DPRINTF(4, ("nic ipv6 %s\n",
1300                                     action_text(rule->action)));
1301                                 return rule->action;
1302                         }
1303                         break;
1304
1305                 case MATCH_WILDCARD:
1306                         if (iswildcard) {
1307                                 DPRINTF(4, ("nic wildcard %s\n",
1308                                     action_text(rule->action)));
1309                                 return rule->action;
1310                         }
1311                         break;
1312
1313                 case MATCH_IFADDR:
1314                         if (rule->prefixlen != -1) {
1315                                 if (addr_eqprefix(if_addr, &rule->addr,
1316                                                   rule->prefixlen)) {
1317
1318                                         DPRINTF(4, ("subnet address match - %s\n",
1319                                             action_text(rule->action)));
1320                                         return rule->action;
1321                                 }
1322                         } else
1323                                 if (SOCK_EQ(if_addr, &rule->addr)) {
1324
1325                                         DPRINTF(4, ("address match - %s\n",
1326                                             action_text(rule->action)));
1327                                         return rule->action;
1328                                 }
1329                         break;
1330
1331                 case MATCH_IFNAME:
1332                         if (if_name != NULL
1333 #if defined(HAVE_FNMATCH) && defined(FNM_CASEFOLD)
1334                             && !fnmatch(rule->if_name, if_name, FNM_CASEFOLD)
1335 #else
1336                             && !strcasecmp(if_name, rule->if_name)
1337 #endif
1338                             ) {
1339
1340                                 DPRINTF(4, ("interface name match - %s\n",
1341                                     action_text(rule->action)));
1342                                 return rule->action;
1343                         }
1344                         break;
1345                 }
1346         }
1347
1348         /*
1349          * Unless explicitly disabled such as with "nic ignore ::1"
1350          * listen on loopback addresses.  Since ntpq and ntpdc query
1351          * "localhost" by default, which typically resolves to ::1 and
1352          * 127.0.0.1, it's useful to default to listening on both.
1353          */
1354         if (isloopback) {
1355                 DPRINTF(4, ("default loopback listen\n"));
1356                 return ACTION_LISTEN;
1357         }
1358
1359         /*
1360          * Treat wildcard addresses specially.  If there is no explicit
1361          * "nic ... wildcard" or "nic ... 0.0.0.0" or "nic ... ::" rule
1362          * default to drop.
1363          */
1364         if (iswildcard) {
1365                 DPRINTF(4, ("default wildcard drop\n"));
1366                 return ACTION_DROP;
1367         }
1368
1369         /*
1370          * Check for "virtual IP" (colon in the interface name) after
1371          * the rules so that "ntpd --interface eth0:1 -novirtualips"
1372          * does indeed listen on eth0:1's addresses.
1373          */
1374         if (!listen_to_virtual_ips && if_name != NULL
1375             && (strchr(if_name, ':') != NULL)) {
1376
1377                 DPRINTF(4, ("virtual ip - ignore\n"));
1378                 return ACTION_IGNORE;
1379         }
1380
1381         /*
1382          * If there are no --interface/-I command-line options and no
1383          * interface/nic rules in ntp.conf, the default action is to
1384          * listen.  In the presence of rules from either, the default
1385          * is to ignore.  This implements ntpd's traditional listen-
1386          * every default with no interface listen configuration, and
1387          * ensures a single -I eth0 or "nic listen eth0" means do not
1388          * listen on any other addresses.
1389          */
1390         if (NULL == nic_rule_list) {
1391                 DPRINTF(4, ("default listen\n"));
1392                 return ACTION_LISTEN;
1393         }
1394
1395         DPRINTF(4, ("implicit ignore\n"));
1396         return ACTION_IGNORE;
1397 }
1398
1399
1400 static void
1401 convert_isc_if(
1402         isc_interface_t *isc_if,
1403         endpt *itf,
1404         u_short port
1405         )
1406 {
1407         const u_char v6loop[16] = {0, 0, 0, 0, 0, 0, 0, 0,
1408                                    0, 0, 0, 0, 0, 0, 0, 1};
1409
1410         strlcpy(itf->name, isc_if->name, sizeof(itf->name));
1411         itf->ifindex = isc_if->ifindex;
1412         itf->family = (u_short)isc_if->af;
1413         AF(&itf->sin) = itf->family;
1414         AF(&itf->mask) = itf->family;
1415         AF(&itf->bcast) = itf->family;
1416         SET_PORT(&itf->sin, port);
1417         SET_PORT(&itf->mask, port);
1418         SET_PORT(&itf->bcast, port);
1419
1420         if (IS_IPV4(&itf->sin)) {
1421                 NSRCADR(&itf->sin) = isc_if->address.type.in.s_addr;
1422                 NSRCADR(&itf->mask) = isc_if->netmask.type.in.s_addr;
1423
1424                 if (isc_if->flags & INTERFACE_F_BROADCAST) {
1425                         itf->flags |= INT_BROADCAST;
1426                         NSRCADR(&itf->bcast) =
1427                             isc_if->broadcast.type.in.s_addr;
1428                 }
1429         }
1430 #ifdef INCLUDE_IPV6_SUPPORT
1431         else if (IS_IPV6(&itf->sin)) {
1432                 SET_ADDR6N(&itf->sin, isc_if->address.type.in6);
1433                 SET_ADDR6N(&itf->mask, isc_if->netmask.type.in6);
1434
1435                 SET_SCOPE(&itf->sin, isc_if->address.zone);
1436         }
1437 #endif /* INCLUDE_IPV6_SUPPORT */
1438
1439
1440         /* Process the rest of the flags */
1441
1442         itf->flags |=
1443                   ((INTERFACE_F_UP & isc_if->flags)
1444                         ? INT_UP : 0)
1445                 | ((INTERFACE_F_LOOPBACK & isc_if->flags)
1446                         ? INT_LOOPBACK : 0)
1447                 | ((INTERFACE_F_POINTTOPOINT & isc_if->flags)
1448                         ? INT_PPP : 0)
1449                 | ((INTERFACE_F_MULTICAST & isc_if->flags)
1450                         ? INT_MULTICAST : 0)
1451                 | ((INTERFACE_F_PRIVACY & isc_if->flags)
1452                         ? INT_PRIVACY : 0)
1453                 ;
1454
1455         /*
1456          * Clear the loopback flag if the address is not localhost.
1457          * http://bugs.ntp.org/1683
1458          */
1459         if (INT_LOOPBACK & itf->flags) {
1460                 if (AF_INET == itf->family) {
1461                         if (127 != (SRCADR(&itf->sin) >> 24))
1462                                 itf->flags &= ~INT_LOOPBACK;
1463                 } else {
1464                         if (memcmp(v6loop, NSRCADR6(&itf->sin),
1465                                    sizeof(NSRCADR6(&itf->sin))))
1466                                 itf->flags &= ~INT_LOOPBACK;
1467                 }
1468         }
1469 }
1470
1471
1472 /*
1473  * refresh_interface
1474  *
1475  * some OSes have been observed to keep
1476  * cached routes even when more specific routes
1477  * become available.
1478  * this can be mitigated by re-binding
1479  * the socket.
1480  */
1481 static int
1482 refresh_interface(
1483         struct interface * interface
1484         )
1485 {
1486 #ifdef  OS_MISSES_SPECIFIC_ROUTE_UPDATES
1487         if (interface->fd != INVALID_SOCKET) {
1488                 int bcast = (interface->flags & INT_BCASTXMIT) != 0;
1489                 /* as we forcibly close() the socket remove the
1490                    broadcast permission indication */
1491                 if (bcast)
1492                         socket_broadcast_disable(interface, &interface->sin);
1493
1494                 close_and_delete_fd_from_list(interface->fd);
1495
1496                 /* create new socket picking up a new first hop binding
1497                    at connect() time */
1498                 interface->fd = open_socket(&interface->sin,
1499                                             bcast, 0, interface);
1500                  /*
1501                   * reset TTL indication so TTL is is set again
1502                   * next time around
1503                   */
1504                 interface->last_ttl = 0;
1505                 return (interface->fd != INVALID_SOCKET);
1506         } else
1507                 return 0;       /* invalid sockets are not refreshable */
1508 #else /* !OS_MISSES_SPECIFIC_ROUTE_UPDATES */
1509         return (interface->fd != INVALID_SOCKET);
1510 #endif /* !OS_MISSES_SPECIFIC_ROUTE_UPDATES */
1511 }
1512
1513 /*
1514  * interface_update - externally callable update function
1515  */
1516 void
1517 interface_update(
1518         interface_receiver_t    receiver,
1519         void *                  data)
1520 {
1521         int new_interface_found;
1522
1523         if (disable_dynamic_updates)
1524                 return;
1525
1526         BLOCKIO();
1527         new_interface_found = update_interfaces(NTP_PORT, receiver, data);
1528         UNBLOCKIO();
1529
1530         if (!new_interface_found)
1531                 return;
1532
1533 #ifdef DEBUG
1534         msyslog(LOG_DEBUG, "new interface(s) found: waking up resolver");
1535 #endif
1536         interrupt_worker_sleep();
1537 }
1538
1539
1540 /*
1541  * sau_from_netaddr() - convert network address on-wire formats.
1542  * Convert from libisc's isc_netaddr_t to NTP's sockaddr_u
1543  */
1544 void
1545 sau_from_netaddr(
1546         sockaddr_u *psau,
1547         const isc_netaddr_t *pna
1548         )
1549 {
1550         ZERO_SOCK(psau);
1551         AF(psau) = (u_short)pna->family;
1552         switch (pna->family) {
1553
1554         case AF_INET:
1555                 memcpy(&psau->sa4.sin_addr, &pna->type.in,
1556                        sizeof(psau->sa4.sin_addr));
1557                 break;
1558
1559         case AF_INET6:
1560                 memcpy(&psau->sa6.sin6_addr, &pna->type.in6,
1561                        sizeof(psau->sa6.sin6_addr));
1562                 break;
1563         }
1564 }
1565
1566
1567 static int
1568 is_wildcard_addr(
1569         const sockaddr_u *psau
1570         )
1571 {
1572         if (IS_IPV4(psau) && !NSRCADR(psau))
1573                 return 1;
1574
1575 #ifdef INCLUDE_IPV6_SUPPORT
1576         if (IS_IPV6(psau) && S_ADDR6_EQ(psau, &in6addr_any))
1577                 return 1;
1578 #endif
1579
1580         return 0;
1581 }
1582
1583
1584 #ifdef OS_NEEDS_REUSEADDR_FOR_IFADDRBIND
1585 /*
1586  * enable/disable re-use of wildcard address socket
1587  */
1588 static void
1589 set_wildcard_reuse(
1590         u_short family,
1591         int     on
1592         )
1593 {
1594         struct interface *any;
1595         SOCKET fd = INVALID_SOCKET;
1596
1597         any = ANY_INTERFACE_BYFAM(family);
1598         if (any != NULL)
1599                 fd = any->fd;
1600
1601         if (fd != INVALID_SOCKET) {
1602                 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
1603                                (void *)&on, sizeof(on)))
1604                         msyslog(LOG_ERR,
1605                                 "set_wildcard_reuse: setsockopt(SO_REUSEADDR, %s) failed: %m",
1606                                 on ? "on" : "off");
1607
1608                 DPRINTF(4, ("set SO_REUSEADDR to %s on %s\n",
1609                             on ? "on" : "off",
1610                             stoa(&any->sin)));
1611         }
1612 }
1613 #endif /* OS_NEEDS_REUSEADDR_FOR_IFADDRBIND */
1614
1615 static isc_boolean_t
1616 check_flags(
1617         sockaddr_u *psau,
1618         const char *name,
1619         u_int32 flags
1620         )
1621 {
1622 #if defined(SIOCGIFAFLAG_IN)
1623         struct ifreq ifr;
1624         int fd;
1625
1626         if (psau->sa.sa_family != AF_INET)
1627                 return ISC_FALSE;
1628         if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
1629                 return ISC_FALSE;
1630         ZERO(ifr);
1631         memcpy(&ifr.ifr_addr, &psau->sa, sizeof(ifr.ifr_addr));
1632         strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1633         if (ioctl(fd, SIOCGIFAFLAG_IN, &ifr) < 0) {
1634                 close(fd);
1635                 return ISC_FALSE;
1636         }
1637         close(fd);
1638         if ((ifr.ifr_addrflags & flags) != 0)
1639                 return ISC_TRUE;
1640 #endif  /* SIOCGIFAFLAG_IN */
1641         return ISC_FALSE;
1642 }
1643
1644 static isc_boolean_t
1645 check_flags6(
1646         sockaddr_u *psau,
1647         const char *name,
1648         u_int32 flags6
1649         )
1650 {
1651 #if defined(INCLUDE_IPV6_SUPPORT) && defined(SIOCGIFAFLAG_IN6)
1652         struct in6_ifreq ifr6;
1653         int fd;
1654
1655         if (psau->sa.sa_family != AF_INET6)
1656                 return ISC_FALSE;
1657         if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
1658                 return ISC_FALSE;
1659         ZERO(ifr6);
1660         memcpy(&ifr6.ifr_addr, &psau->sa6, sizeof(ifr6.ifr_addr));
1661         strlcpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
1662         if (ioctl(fd, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
1663                 close(fd);
1664                 return ISC_FALSE;
1665         }
1666         close(fd);
1667         if ((ifr6.ifr_ifru.ifru_flags6 & flags6) != 0)
1668                 return ISC_TRUE;
1669 #endif  /* INCLUDE_IPV6_SUPPORT && SIOCGIFAFLAG_IN6 */
1670         return ISC_FALSE;
1671 }
1672
1673 static isc_boolean_t
1674 is_anycast(
1675         sockaddr_u *psau,
1676         const char *name
1677         )
1678 {
1679 #ifdef IN6_IFF_ANYCAST
1680         return check_flags6(psau, name, IN6_IFF_ANYCAST);
1681 #else
1682         return ISC_FALSE;
1683 #endif
1684 }
1685
1686 static isc_boolean_t
1687 is_valid(
1688         sockaddr_u *psau,
1689         const char *name
1690         )
1691 {
1692         u_int32 flags;
1693
1694         flags = 0;
1695         switch (psau->sa.sa_family) {
1696         case AF_INET:
1697 #ifdef IN_IFF_DETACHED
1698                 flags |= IN_IFF_DETACHED;
1699 #endif
1700 #ifdef IN_IFF_TENTATIVE
1701                 flags |= IN_IFF_TENTATIVE;
1702 #endif
1703                 return check_flags(psau, name, flags) ? ISC_FALSE : ISC_TRUE;
1704         case AF_INET6:
1705 #ifdef IN6_IFF_DEPARTED
1706                 flags |= IN6_IFF_DEPARTED;
1707 #endif
1708 #ifdef IN6_IFF_DETACHED
1709                 flags |= IN6_IFF_DETACHED;
1710 #endif
1711 #ifdef IN6_IFF_TENTATIVE
1712                 flags |= IN6_IFF_TENTATIVE;
1713 #endif
1714                 return check_flags6(psau, name, flags) ? ISC_FALSE : ISC_TRUE;
1715         default:
1716                 return ISC_FALSE;
1717         }
1718 }
1719
1720 /*
1721  * update_interface strategy
1722  *
1723  * toggle configuration phase
1724  *
1725  * Phase 1:
1726  * forall currently existing interfaces
1727  *   if address is known:
1728  *      drop socket - rebind again
1729  *
1730  *   if address is NOT known:
1731  *      attempt to create a new interface entry
1732  *
1733  * Phase 2:
1734  * forall currently known non MCAST and WILDCARD interfaces
1735  *   if interface does not match configuration phase (not seen in phase 1):
1736  *      remove interface from known interface list
1737  *      forall peers associated with this interface
1738  *         disconnect peer from this interface
1739  *
1740  * Phase 3:
1741  *   attempt to re-assign interfaces to peers
1742  *
1743  */
1744
1745 static int
1746 update_interfaces(
1747         u_short                 port,
1748         interface_receiver_t    receiver,
1749         void *                  data
1750         )
1751 {
1752         isc_mem_t *             mctx = (void *)-1;
1753         interface_info_t        ifi;
1754         isc_interfaceiter_t *   iter;
1755         isc_result_t            result;
1756         isc_interface_t         isc_if;
1757         int                     new_interface_found;
1758         unsigned int            family;
1759         endpt                   enumep;
1760         endpt *                 ep;
1761         endpt *                 next_ep;
1762
1763         DPRINTF(3, ("update_interfaces(%d)\n", port));
1764
1765         /*
1766          * phase one - scan interfaces
1767          * - create those that are not found
1768          * - update those that are found
1769          */
1770
1771         new_interface_found = FALSE;
1772         iter = NULL;
1773         result = isc_interfaceiter_create(mctx, &iter);
1774
1775         if (result != ISC_R_SUCCESS)
1776                 return 0;
1777
1778         /*
1779          * Toggle system interface scan phase to find untouched
1780          * interfaces to be deleted.
1781          */
1782         sys_interphase ^= 0x1;
1783
1784         for (result = isc_interfaceiter_first(iter);
1785              ISC_R_SUCCESS == result;
1786              result = isc_interfaceiter_next(iter)) {
1787
1788                 result = isc_interfaceiter_current(iter, &isc_if);
1789
1790                 if (result != ISC_R_SUCCESS)
1791                         break;
1792
1793                 /* See if we have a valid family to use */
1794                 family = isc_if.address.family;
1795                 if (AF_INET != family && AF_INET6 != family)
1796                         continue;
1797                 if (AF_INET == family && !ipv4_works)
1798                         continue;
1799                 if (AF_INET6 == family && !ipv6_works)
1800                         continue;
1801
1802                 /* create prototype */
1803                 init_interface(&enumep);
1804
1805                 convert_isc_if(&isc_if, &enumep, port);
1806
1807                 DPRINT_INTERFACE(4, (&enumep, "examining ", "\n"));
1808
1809                 /*
1810                  * Check if and how we are going to use the interface.
1811                  */
1812                 switch (interface_action(enumep.name, &enumep.sin,
1813                                          enumep.flags)) {
1814
1815                 case ACTION_IGNORE:
1816                         DPRINTF(4, ("ignoring interface %s (%s) - by nic rules\n",
1817                                     enumep.name, stoa(&enumep.sin)));
1818                         continue;
1819
1820                 case ACTION_LISTEN:
1821                         DPRINTF(4, ("listen interface %s (%s) - by nic rules\n",
1822                                     enumep.name, stoa(&enumep.sin)));
1823                         enumep.ignore_packets = ISC_FALSE;
1824                         break;
1825
1826                 case ACTION_DROP:
1827                         DPRINTF(4, ("drop on interface %s (%s) - by nic rules\n",
1828                                     enumep.name, stoa(&enumep.sin)));
1829                         enumep.ignore_packets = ISC_TRUE;
1830                         break;
1831                 }
1832
1833                  /* interfaces must be UP to be usable */
1834                 if (!(enumep.flags & INT_UP)) {
1835                         DPRINTF(4, ("skipping interface %s (%s) - DOWN\n",
1836                                     enumep.name, stoa(&enumep.sin)));
1837                         continue;
1838                 }
1839
1840                 /*
1841                  * skip any interfaces UP and bound to a wildcard
1842                  * address - some dhcp clients produce that in the
1843                  * wild
1844                  */
1845                 if (is_wildcard_addr(&enumep.sin))
1846                         continue;
1847
1848                 if (is_anycast(&enumep.sin, isc_if.name))
1849                         continue;
1850
1851                 /*
1852                  * skip any address that is an invalid state to be used
1853                  */
1854                 if (!is_valid(&enumep.sin, isc_if.name))
1855                         continue;
1856
1857                 /*
1858                  * map to local *address* in order to map all duplicate
1859                  * interfaces to an endpt structure with the appropriate
1860                  * socket.  Our name space is (ip-address), NOT
1861                  * (interface name, ip-address).
1862                  */
1863                 ep = getinterface(&enumep.sin, INT_WILDCARD);
1864
1865                 if (ep != NULL && refresh_interface(ep)) {
1866                         /*
1867                          * found existing and up to date interface -
1868                          * mark present.
1869                          */
1870                         if (ep->phase != sys_interphase) {
1871                                 /*
1872                                  * On a new round we reset the name so
1873                                  * the interface name shows up again if
1874                                  * this address is no longer shared.
1875                                  * We reset ignore_packets from the
1876                                  * new prototype to respect any runtime
1877                                  * changes to the nic rules.
1878                                  */
1879                                 strlcpy(ep->name, enumep.name,
1880                                         sizeof(ep->name));
1881                                 ep->ignore_packets =
1882                                             enumep.ignore_packets;
1883                         } else {
1884                                 /* name collision - rename interface */
1885                                 strlcpy(ep->name, "*multiple*",
1886                                         sizeof(ep->name));
1887                         }
1888
1889                         DPRINT_INTERFACE(4, (ep, "updating ",
1890                                              " present\n"));
1891
1892                         if (ep->ignore_packets !=
1893                             enumep.ignore_packets) {
1894                                 /*
1895                                  * We have conflicting configurations
1896                                  * for the interface address. This is
1897                                  * caused by using -I <interfacename>
1898                                  * for an interface that shares its
1899                                  * address with other interfaces. We
1900                                  * can not disambiguate incoming
1901                                  * packets delivered to this socket
1902                                  * without extra syscalls/features.
1903                                  * These are not (commonly) available.
1904                                  * Note this is a more unusual
1905                                  * configuration where several
1906                                  * interfaces share an address but
1907                                  * filtering via interface name is
1908                                  * attempted.  We resolve the
1909                                  * configuration conflict by disabling
1910                                  * the processing of received packets.
1911                                  * This leads to no service on the
1912                                  * interface address where the conflict
1913                                  * occurs.
1914                                  */
1915                                 msyslog(LOG_ERR,
1916                                         "WARNING: conflicting enable configuration for interfaces %s and %s for address %s - unsupported configuration - address DISABLED",
1917                                         enumep.name, ep->name,
1918                                         stoa(&enumep.sin));
1919
1920                                 ep->ignore_packets = ISC_TRUE;
1921                         }
1922
1923                         ep->phase = sys_interphase;
1924
1925                         ifi.action = IFS_EXISTS;
1926                         ifi.ep = ep;
1927                         if (receiver != NULL)
1928                                 (*receiver)(data, &ifi);
1929                 } else {
1930                         /*
1931                          * This is new or refreshing failed - add to
1932                          * our interface list.  If refreshing failed we
1933                          * will delete the interface structure in phase
1934                          * 2 as the interface was not marked current.
1935                          * We can bind to the address as the refresh
1936                          * code already closed the offending socket
1937                          */
1938                         ep = create_interface(port, &enumep);
1939
1940                         if (ep != NULL) {
1941                                 ifi.action = IFS_CREATED;
1942                                 ifi.ep = ep;
1943                                 if (receiver != NULL)
1944                                         (*receiver)(data, &ifi);
1945
1946                                 new_interface_found = TRUE;
1947                                 DPRINT_INTERFACE(3,
1948                                         (ep, "updating ",
1949                                          " new - created\n"));
1950                         } else {
1951                                 DPRINT_INTERFACE(3,
1952                                         (&enumep, "updating ",
1953                                          " new - creation FAILED"));
1954
1955                                 msyslog(LOG_INFO,
1956                                         "failed to init interface for address %s",
1957                                         stoa(&enumep.sin));
1958                                 continue;
1959                         }
1960                 }
1961         }
1962
1963         isc_interfaceiter_destroy(&iter);
1964
1965         /*
1966          * phase 2 - delete gone interfaces - reassigning peers to
1967          * other interfaces
1968          */
1969         for (ep = ep_list; ep != NULL; ep = next_ep) {
1970                 next_ep = ep->elink;
1971
1972                 /*
1973                  * if phase does not match sys_phase this interface was
1974                  * not enumerated during the last interface scan - so it
1975                  * is gone and will be deleted here unless it did not
1976                  * originate from interface enumeration (INT_WILDCARD,
1977                  * INT_MCASTIF).
1978                  */
1979                 if (((INT_WILDCARD | INT_MCASTIF) & ep->flags) ||
1980                     ep->phase == sys_interphase)
1981                         continue;
1982
1983                 DPRINT_INTERFACE(3, (ep, "updating ",
1984                                      "GONE - deleting\n"));
1985                 remove_interface(ep);
1986
1987                 ifi.action = IFS_DELETED;
1988                 ifi.ep = ep;
1989                 if (receiver != NULL)
1990                         (*receiver)(data, &ifi);
1991
1992                 /* disconnect peers from deleted endpt. */
1993                 while (ep->peers != NULL)
1994                         set_peerdstadr(ep->peers, NULL);
1995
1996                 /*
1997                  * update globals in case we lose
1998                  * a loopback interface
1999                  */
2000                 if (ep == loopback_interface)
2001                         loopback_interface = NULL;
2002
2003                 delete_interface(ep);
2004         }
2005
2006         /*
2007          * phase 3 - re-configure as the world has possibly changed
2008          *
2009          * never ever make this conditional again - it is needed to track
2010          * routing updates. see bug #2506
2011          */
2012         refresh_all_peerinterfaces();
2013
2014         if (broadcast_client_enabled)
2015                 io_setbclient();
2016
2017         if (sys_bclient)
2018                 io_setbclient();
2019
2020 #ifdef MCAST
2021         /*
2022          * Check multicast interfaces and try to join multicast groups if
2023          * not joined yet.
2024          */
2025         for (ep = ep_list; ep != NULL; ep = ep->elink) {
2026                 remaddr_t *entry;
2027
2028                 if (!(INT_MCASTIF & ep->flags) || (INT_MCASTOPEN & ep->flags))
2029                         continue;
2030
2031                 /* Find remote address that was linked to this interface */
2032                 for (entry = remoteaddr_list;
2033                      entry != NULL;
2034                      entry = entry->link) {
2035                         if (entry->ep == ep) {
2036                                 if (socket_multicast_enable(ep, &entry->addr)) {
2037                                         msyslog(LOG_INFO,
2038                                                 "Joined %s socket to multicast group %s",
2039                                                 stoa(&ep->sin),
2040                                                 stoa(&entry->addr));
2041                                 }
2042                                 break;
2043                         }
2044                 }
2045         }
2046 #endif /* MCAST */
2047
2048         return new_interface_found;
2049 }
2050
2051
2052 /*
2053  * create_sockets - create a socket for each interface plus a default
2054  *                      socket for when we don't know where to send
2055  */
2056 static int
2057 create_sockets(
2058         u_short port
2059         )
2060 {
2061 #ifndef HAVE_IO_COMPLETION_PORT
2062         /*
2063          * I/O Completion Ports don't care about the select and FD_SET
2064          */
2065         maxactivefd = 0;
2066         FD_ZERO(&activefds);
2067 #endif
2068
2069         DPRINTF(2, ("create_sockets(%d)\n", port));
2070
2071         create_wildcards(port);
2072
2073         update_interfaces(port, NULL, NULL);
2074
2075         /*
2076          * Now that we have opened all the sockets, turn off the reuse
2077          * flag for security.
2078          */
2079         set_reuseaddr(0);
2080
2081         DPRINTF(2, ("create_sockets: Total interfaces = %d\n", ninterfaces));
2082
2083         return ninterfaces;
2084 }
2085
2086 /*
2087  * create_interface - create a new interface for a given prototype
2088  *                    binding the socket.
2089  */
2090 static struct interface *
2091 create_interface(
2092         u_short                 port,
2093         struct interface *      protot
2094         )
2095 {
2096         sockaddr_u      resmask;
2097         endpt *         iface;
2098 #if defined(MCAST) && defined(MULTICAST_NONEWSOCKET)
2099         remaddr_t *     entry;
2100         remaddr_t *     next_entry;
2101 #endif
2102         DPRINTF(2, ("create_interface(%s#%d)\n", stoa(&protot->sin),
2103                     port));
2104
2105         /* build an interface */
2106         iface = new_interface(protot);
2107
2108         /*
2109          * create socket
2110          */
2111         iface->fd = open_socket(&iface->sin, 0, 0, iface);
2112
2113         if (iface->fd != INVALID_SOCKET)
2114                 log_listen_address(iface);
2115
2116         if ((INT_BROADCAST & iface->flags)
2117             && iface->bfd != INVALID_SOCKET)
2118                 msyslog(LOG_INFO, "Listening on broadcast address %s#%d",
2119                         stoa((&iface->bcast)), port);
2120
2121         if (INVALID_SOCKET == iface->fd
2122             && INVALID_SOCKET == iface->bfd) {
2123                 msyslog(LOG_ERR, "unable to create socket on %s (%d) for %s#%d",
2124                         iface->name,
2125                         iface->ifnum,
2126                         stoa((&iface->sin)),
2127                         port);
2128                 delete_interface(iface);
2129                 return NULL;
2130         }
2131
2132         /*
2133          * Blacklist our own addresses, no use talking to ourself
2134          */
2135         SET_HOSTMASK(&resmask, AF(&iface->sin));
2136         hack_restrict(RESTRICT_FLAGS, &iface->sin, &resmask,
2137                       -4, RESM_NTPONLY | RESM_INTERFACE, RES_IGNORE, 0);
2138
2139         /*
2140          * set globals with the first found
2141          * loopback interface of the appropriate class
2142          */
2143         if (NULL == loopback_interface && AF_INET == iface->family
2144             && (INT_LOOPBACK & iface->flags))
2145                 loopback_interface = iface;
2146
2147         /*
2148          * put into our interface list
2149          */
2150         add_addr_to_list(&iface->sin, iface);
2151         add_interface(iface);
2152
2153 #if defined(MCAST) && defined(MULTICAST_NONEWSOCKET)
2154         /*
2155          * Join any previously-configured compatible multicast groups.
2156          */
2157         if (INT_MULTICAST & iface->flags &&
2158             !((INT_LOOPBACK | INT_WILDCARD) & iface->flags) &&
2159             !iface->ignore_packets) {
2160                 for (entry = remoteaddr_list;
2161                      entry != NULL;
2162                      entry = next_entry) {
2163                         next_entry = entry->link;
2164                         if (AF(&iface->sin) != AF(&entry->addr) ||
2165                             !IS_MCAST(&entry->addr))
2166                                 continue;
2167                         if (socket_multicast_enable(iface,
2168                                                     &entry->addr))
2169                                 msyslog(LOG_INFO,
2170                                         "Joined %s socket to multicast group %s",
2171                                         stoa(&iface->sin),
2172                                         stoa(&entry->addr));
2173                         else
2174                                 msyslog(LOG_ERR,
2175                                         "Failed to join %s socket to multicast group %s",
2176                                         stoa(&iface->sin),
2177                                         stoa(&entry->addr));
2178                 }
2179         }
2180 #endif  /* MCAST && MCAST_NONEWSOCKET */
2181
2182         DPRINT_INTERFACE(2, (iface, "created ", "\n"));
2183         return iface;
2184 }
2185
2186
2187 #ifdef SO_EXCLUSIVEADDRUSE
2188 static void
2189 set_excladdruse(
2190         SOCKET fd
2191         )
2192 {
2193         int one = 1;
2194         int failed;
2195 #ifdef SYS_WINNT
2196         DWORD err;
2197 #endif
2198
2199         failed = setsockopt(fd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE,
2200                             (void *)&one, sizeof(one));
2201
2202         if (!failed)
2203                 return;
2204
2205 #ifdef SYS_WINNT
2206         /*
2207          * Prior to Windows XP setting SO_EXCLUSIVEADDRUSE can fail with
2208          * error WSAINVAL depending on service pack level and whether
2209          * the user account is in the Administrators group.  Do not
2210          * complain if it fails that way on versions prior to XP (5.1).
2211          */
2212         err = GetLastError();
2213
2214         if (isc_win32os_versioncheck(5, 1, 0, 0) < 0    /* < 5.1/XP */
2215             && WSAEINVAL == err)
2216                 return;
2217
2218         SetLastError(err);
2219 #endif
2220         msyslog(LOG_ERR,
2221                 "setsockopt(%d, SO_EXCLUSIVEADDRUSE, on): %m",
2222                 (int)fd);
2223 }
2224 #endif  /* SO_EXCLUSIVEADDRUSE */
2225
2226
2227 /*
2228  * set_reuseaddr() - set/clear REUSEADDR on all sockets
2229  *                      NB possible hole - should we be doing this on broadcast
2230  *                      fd's also?
2231  */
2232 static void
2233 set_reuseaddr(
2234         int flag
2235         )
2236 {
2237 #ifndef SO_EXCLUSIVEADDRUSE
2238         endpt *ep;
2239
2240         for (ep = ep_list; ep != NULL; ep = ep->elink) {
2241                 if (ep->flags & INT_WILDCARD)
2242                         continue;
2243
2244                 /*
2245                  * if ep->fd  is INVALID_SOCKET, we might have a adapter
2246                  * configured but not present
2247                  */
2248                 DPRINTF(4, ("setting SO_REUSEADDR on %.16s@%s to %s\n",
2249                             ep->name, stoa(&ep->sin),
2250                             flag ? "on" : "off"));
2251
2252                 if (ep->fd != INVALID_SOCKET) {
2253                         if (setsockopt(ep->fd, SOL_SOCKET, SO_REUSEADDR,
2254                                        (void *)&flag, sizeof(flag))) {
2255                                 msyslog(LOG_ERR, "set_reuseaddr: setsockopt(%s, SO_REUSEADDR, %s) failed: %m",
2256                                         stoa(&ep->sin), flag ? "on" : "off");
2257                         }
2258                 }
2259         }
2260 #endif /* ! SO_EXCLUSIVEADDRUSE */
2261 }
2262
2263 /*
2264  * This is just a wrapper around an internal function so we can
2265  * make other changes as necessary later on
2266  */
2267 void
2268 enable_broadcast(
2269         struct interface *      iface,
2270         sockaddr_u *            baddr
2271         )
2272 {
2273 #ifdef OPEN_BCAST_SOCKET
2274         socket_broadcast_enable(iface, iface->fd, baddr);
2275 #endif
2276 }
2277
2278 #ifdef OPEN_BCAST_SOCKET
2279 /*
2280  * Enable a broadcast address to a given socket
2281  * The socket is in the ep_list all we need to do is enable
2282  * broadcasting. It is not this function's job to select the socket
2283  */
2284 static isc_boolean_t
2285 socket_broadcast_enable(
2286         struct interface *      iface,
2287         SOCKET                  fd,
2288         sockaddr_u *            baddr
2289         )
2290 {
2291 #ifdef SO_BROADCAST
2292         int on = 1;
2293
2294         if (IS_IPV4(baddr)) {
2295                 /* if this interface can support broadcast, set SO_BROADCAST */
2296                 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST,
2297                                (void *)&on, sizeof(on)))
2298                         msyslog(LOG_ERR,
2299                                 "setsockopt(SO_BROADCAST) enable failure on address %s: %m",
2300                                 stoa(baddr));
2301                 else
2302                         DPRINTF(2, ("Broadcast enabled on socket %d for address %s\n",
2303                                     fd, stoa(baddr)));
2304         }
2305         iface->flags |= INT_BCASTXMIT;
2306         return ISC_TRUE;
2307 #else
2308         return ISC_FALSE;
2309 #endif /* SO_BROADCAST */
2310 }
2311
2312 #ifdef  OS_MISSES_SPECIFIC_ROUTE_UPDATES
2313 /*
2314  * Remove a broadcast address from a given socket
2315  * The socket is in the ep_list all we need to do is disable
2316  * broadcasting. It is not this function's job to select the socket
2317  */
2318 static isc_boolean_t
2319 socket_broadcast_disable(
2320         struct interface *      iface,
2321         sockaddr_u *            baddr
2322         )
2323 {
2324 #ifdef SO_BROADCAST
2325         int off = 0;    /* This seems to be OK as an int */
2326
2327         if (IS_IPV4(baddr) && setsockopt(iface->fd, SOL_SOCKET,
2328             SO_BROADCAST, (void *)&off, sizeof(off)))
2329                 msyslog(LOG_ERR,
2330                         "setsockopt(SO_BROADCAST) disable failure on address %s: %m",
2331                         stoa(baddr));
2332
2333         iface->flags &= ~INT_BCASTXMIT;
2334         return ISC_TRUE;
2335 #else
2336         return ISC_FALSE;
2337 #endif /* SO_BROADCAST */
2338 }
2339 #endif /* OS_MISSES_SPECIFIC_ROUTE_UPDATES */
2340
2341 #endif /* OPEN_BCAST_SOCKET */
2342
2343 /*
2344  * return the broadcast client flag value
2345  */
2346 isc_boolean_t
2347 get_broadcastclient_flag(void)
2348 {
2349         return (broadcast_client_enabled);
2350 }
2351
2352 /*
2353  * Check to see if the address is a multicast address
2354  */
2355 static isc_boolean_t
2356 addr_ismulticast(
2357         sockaddr_u *maddr
2358         )
2359 {
2360         isc_boolean_t result;
2361
2362 #ifndef INCLUDE_IPV6_MULTICAST_SUPPORT
2363         /*
2364          * If we don't have IPV6 support any IPV6 addr is not multicast
2365          */
2366         if (IS_IPV6(maddr))
2367                 result = ISC_FALSE;
2368         else
2369 #endif
2370                 result = IS_MCAST(maddr);
2371
2372         if (!result)
2373                 DPRINTF(4, ("address %s is not multicast\n",
2374                             stoa(maddr)));
2375
2376         return result;
2377 }
2378
2379 /*
2380  * Multicast servers need to set the appropriate Multicast interface
2381  * socket option in order for it to know which interface to use for
2382  * send the multicast packet.
2383  */
2384 void
2385 enable_multicast_if(
2386         struct interface *      iface,
2387         sockaddr_u *            maddr
2388         )
2389 {
2390 #ifdef MCAST
2391 #ifdef IP_MULTICAST_LOOP
2392         TYPEOF_IP_MULTICAST_LOOP off = 0;
2393 #endif
2394 #if defined(INCLUDE_IPV6_MULTICAST_SUPPORT) && defined(IPV6_MULTICAST_LOOP)
2395         u_int off6 = 0;
2396 #endif
2397
2398         REQUIRE(AF(maddr) == AF(&iface->sin));
2399
2400         switch (AF(&iface->sin)) {
2401
2402         case AF_INET:
2403 #ifdef IP_MULTICAST_LOOP
2404                 /*
2405                  * Don't send back to itself, but allow failure to set
2406                  */
2407                 if (setsockopt(iface->fd, IPPROTO_IP,
2408                                IP_MULTICAST_LOOP,
2409                                (void *)&off,
2410                                sizeof(off))) {
2411
2412                         msyslog(LOG_ERR,
2413                                 "setsockopt IP_MULTICAST_LOOP failed: %m on socket %d, addr %s for multicast address %s",
2414                                 iface->fd, stoa(&iface->sin),
2415                                 stoa(maddr));
2416                 }
2417 #endif
2418                 break;
2419
2420         case AF_INET6:
2421 #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT
2422 #ifdef IPV6_MULTICAST_LOOP
2423                 /*
2424                  * Don't send back to itself, but allow failure to set
2425                  */
2426                 if (setsockopt(iface->fd, IPPROTO_IPV6,
2427                                IPV6_MULTICAST_LOOP,
2428                                (void *) &off6, sizeof(off6))) {
2429
2430                         msyslog(LOG_ERR,
2431                                 "setsockopt IPV6_MULTICAST_LOOP failed: %m on socket %d, addr %s for multicast address %s",
2432                                 iface->fd, stoa(&iface->sin),
2433                                 stoa(maddr));
2434                 }
2435 #endif
2436                 break;
2437 #else
2438                 return;
2439 #endif  /* INCLUDE_IPV6_MULTICAST_SUPPORT */
2440         }
2441         return;
2442 #endif
2443 }
2444
2445 /*
2446  * Add a multicast address to a given socket
2447  * The socket is in the ep_list all we need to do is enable
2448  * multicasting. It is not this function's job to select the socket
2449  */
2450 #if defined(MCAST)
2451 static isc_boolean_t
2452 socket_multicast_enable(
2453         endpt *         iface,
2454         sockaddr_u *    maddr
2455         )
2456 {
2457         struct ip_mreq          mreq;
2458 # ifdef INCLUDE_IPV6_MULTICAST_SUPPORT
2459         struct ipv6_mreq        mreq6;
2460 # endif
2461         switch (AF(maddr)) {
2462
2463         case AF_INET:
2464                 ZERO(mreq);
2465                 mreq.imr_multiaddr = SOCK_ADDR4(maddr);
2466                 mreq.imr_interface.s_addr = htonl(INADDR_ANY);
2467                 if (setsockopt(iface->fd,
2468                                IPPROTO_IP,
2469                                IP_ADD_MEMBERSHIP,
2470                                (void *)&mreq,
2471                                sizeof(mreq))) {
2472                         DPRINTF(2, (
2473                                 "setsockopt IP_ADD_MEMBERSHIP failed: %m on socket %d, addr %s for %x / %x (%s)",
2474                                 iface->fd, stoa(&iface->sin),
2475                                 mreq.imr_multiaddr.s_addr,
2476                                 mreq.imr_interface.s_addr,
2477                                 stoa(maddr)));
2478                         return ISC_FALSE;
2479                 }
2480                 DPRINTF(4, ("Added IPv4 multicast membership on socket %d, addr %s for %x / %x (%s)\n",
2481                             iface->fd, stoa(&iface->sin),
2482                             mreq.imr_multiaddr.s_addr,
2483                             mreq.imr_interface.s_addr, stoa(maddr)));
2484                 break;
2485
2486         case AF_INET6:
2487 # ifdef INCLUDE_IPV6_MULTICAST_SUPPORT
2488                 /*
2489                  * Enable reception of multicast packets.
2490                  * If the address is link-local we can get the
2491                  * interface index from the scope id. Don't do this
2492                  * for other types of multicast addresses. For now let
2493                  * the kernel figure it out.
2494                  */
2495                 ZERO(mreq6);
2496                 mreq6.ipv6mr_multiaddr = SOCK_ADDR6(maddr);
2497                 mreq6.ipv6mr_interface = iface->ifindex;
2498
2499                 if (setsockopt(iface->fd, IPPROTO_IPV6,
2500                                IPV6_JOIN_GROUP, (void *)&mreq6,
2501                                sizeof(mreq6))) {
2502                         DPRINTF(2, (
2503                                 "setsockopt IPV6_JOIN_GROUP failed: %m on socket %d, addr %s for interface %u (%s)",
2504                                 iface->fd, stoa(&iface->sin),
2505                                 mreq6.ipv6mr_interface, stoa(maddr)));
2506                         return ISC_FALSE;
2507                 }
2508                 DPRINTF(4, ("Added IPv6 multicast group on socket %d, addr %s for interface %u (%s)\n",
2509                             iface->fd, stoa(&iface->sin),
2510                             mreq6.ipv6mr_interface, stoa(maddr)));
2511 # else
2512                 return ISC_FALSE;
2513 # endif /* INCLUDE_IPV6_MULTICAST_SUPPORT */
2514         }
2515         iface->flags |= INT_MCASTOPEN;
2516         iface->num_mcast++;
2517
2518         return ISC_TRUE;
2519 }
2520 #endif  /* MCAST */
2521
2522
2523 /*
2524  * Remove a multicast address from a given socket
2525  * The socket is in the ep_list all we need to do is disable
2526  * multicasting. It is not this function's job to select the socket
2527  */
2528 #ifdef MCAST
2529 static isc_boolean_t
2530 socket_multicast_disable(
2531         struct interface *      iface,
2532         sockaddr_u *            maddr
2533         )
2534 {
2535 # ifdef INCLUDE_IPV6_MULTICAST_SUPPORT
2536         struct ipv6_mreq mreq6;
2537 # endif
2538         struct ip_mreq mreq;
2539
2540         ZERO(mreq);
2541
2542         if (find_addr_in_list(maddr) == NULL) {
2543                 DPRINTF(4, ("socket_multicast_disable(%s): not found\n",
2544                             stoa(maddr)));
2545                 return ISC_TRUE;
2546         }
2547
2548         switch (AF(maddr)) {
2549
2550         case AF_INET:
2551                 mreq.imr_multiaddr = SOCK_ADDR4(maddr);
2552                 mreq.imr_interface = SOCK_ADDR4(&iface->sin);
2553                 if (setsockopt(iface->fd, IPPROTO_IP,
2554                                IP_DROP_MEMBERSHIP, (void *)&mreq,
2555                                sizeof(mreq))) {
2556
2557                         msyslog(LOG_ERR,
2558                                 "setsockopt IP_DROP_MEMBERSHIP failed: %m on socket %d, addr %s for %x / %x (%s)",
2559                                 iface->fd, stoa(&iface->sin),
2560                                 SRCADR(maddr), SRCADR(&iface->sin),
2561                                 stoa(maddr));
2562                         return ISC_FALSE;
2563                 }
2564                 break;
2565         case AF_INET6:
2566 # ifdef INCLUDE_IPV6_MULTICAST_SUPPORT
2567                 /*
2568                  * Disable reception of multicast packets
2569                  * If the address is link-local we can get the
2570                  * interface index from the scope id.  Don't do this
2571                  * for other types of multicast addresses. For now let
2572                  * the kernel figure it out.
2573                  */
2574                 mreq6.ipv6mr_multiaddr = SOCK_ADDR6(maddr);
2575                 mreq6.ipv6mr_interface = iface->ifindex;
2576
2577                 if (setsockopt(iface->fd, IPPROTO_IPV6,
2578                                IPV6_LEAVE_GROUP, (void *)&mreq6,
2579                                sizeof(mreq6))) {
2580
2581                         msyslog(LOG_ERR,
2582                                 "setsockopt IPV6_LEAVE_GROUP failure: %m on socket %d, addr %s for %d (%s)",
2583                                 iface->fd, stoa(&iface->sin),
2584                                 iface->ifindex, stoa(maddr));
2585                         return ISC_FALSE;
2586                 }
2587                 break;
2588 # else
2589                 return ISC_FALSE;
2590 # endif /* INCLUDE_IPV6_MULTICAST_SUPPORT */
2591         }
2592
2593         iface->num_mcast--;
2594         if (!iface->num_mcast)
2595                 iface->flags &= ~INT_MCASTOPEN;
2596
2597         return ISC_TRUE;
2598 }
2599 #endif  /* MCAST */
2600
2601 /*
2602  * io_setbclient - open the broadcast client sockets
2603  */
2604 void
2605 io_setbclient(void)
2606 {
2607 #ifdef OPEN_BCAST_SOCKET
2608         struct interface *      interf;
2609         unsigned int            nif;
2610
2611         nif = 0;
2612         set_reuseaddr(1);
2613
2614         for (interf = ep_list;
2615              interf != NULL;
2616              interf = interf->elink) {
2617
2618                 if (interf->flags & (INT_WILDCARD | INT_LOOPBACK))
2619                         continue;
2620
2621                 /* use only allowed addresses */
2622                 if (interf->ignore_packets)
2623                         continue;
2624
2625                 /* Need a broadcast-capable interface */
2626                 if (!(interf->flags & INT_BROADCAST))
2627                         continue;
2628
2629                 /* Only IPv4 addresses are valid for broadcast */
2630                 REQUIRE(IS_IPV4(&interf->bcast));
2631
2632                 /* Do we already have the broadcast address open? */
2633                 if (interf->flags & INT_BCASTOPEN) {
2634                         /*
2635                          * account for already open interfaces to avoid
2636                          * misleading warning below
2637                          */
2638                         nif++;
2639                         continue;
2640                 }
2641
2642                 /*
2643                  * Try to open the broadcast address
2644                  */
2645                 interf->family = AF_INET;
2646                 interf->bfd = open_socket(&interf->bcast, 1, 0, interf);
2647
2648                 /*
2649                  * If we succeeded then we use it otherwise enable
2650                  * broadcast on the interface address
2651                  */
2652                 if (interf->bfd != INVALID_SOCKET) {
2653                         nif++;
2654                         interf->flags |= INT_BCASTOPEN;
2655                         msyslog(LOG_INFO,
2656                                 "Listen for broadcasts to %s on interface #%d %s",
2657                                 stoa(&interf->bcast), interf->ifnum, interf->name);
2658                 } else switch (errno) {
2659                         /* Silently ignore EADDRINUSE as we probably
2660                          * opened the socket already for an address in
2661                          * the same network */
2662                 case EADDRINUSE:
2663                         /* Some systems cannot bind a socket to a broadcast
2664                          * address, as that is not a valid host address. */
2665                 case EADDRNOTAVAIL:
2666 #                   ifdef SYS_WINNT     /*TODO: use for other systems, too? */
2667                         /* avoid recurrence here -- if we already have a
2668                          * regular socket, it's quite useless to try this
2669                          * again.
2670                          */
2671                         if (interf->fd != INVALID_SOCKET) {
2672                                 interf->flags |= INT_BCASTOPEN;
2673                                 nif++;
2674                         }
2675 #                   endif
2676                         break;
2677
2678                 default:
2679                         msyslog(LOG_INFO,
2680                                 "failed to listen for broadcasts to %s on interface #%d %s",
2681                                 stoa(&interf->bcast), interf->ifnum, interf->name);
2682                         break;
2683                 }
2684         }
2685         set_reuseaddr(0);
2686         if (nif != 0) {
2687                 broadcast_client_enabled = ISC_TRUE;
2688                 DPRINTF(1, ("io_setbclient: listening to %d broadcast addresses\n", nif));
2689         } else {
2690                 broadcast_client_enabled = ISC_FALSE;
2691                 msyslog(LOG_ERR,
2692                         "Unable to listen for broadcasts, no broadcast interfaces available");
2693         }
2694 #else
2695         msyslog(LOG_ERR,
2696                 "io_setbclient: Broadcast Client disabled by build");
2697 #endif  /* OPEN_BCAST_SOCKET */
2698 }
2699
2700 /*
2701  * io_unsetbclient - close the broadcast client sockets
2702  */
2703 void
2704 io_unsetbclient(void)
2705 {
2706         endpt *ep;
2707
2708         for (ep = ep_list; ep != NULL; ep = ep->elink) {
2709                 if (INT_WILDCARD & ep->flags)
2710                         continue;
2711                 if (!(INT_BCASTOPEN & ep->flags))
2712                         continue;
2713
2714                 if (ep->bfd != INVALID_SOCKET) {
2715                         /* destroy broadcast listening socket */
2716                         msyslog(LOG_INFO,
2717                                 "stop listening for broadcasts to %s on interface #%d %s",
2718                                 stoa(&ep->bcast), ep->ifnum, ep->name);
2719 #                   ifdef HAVE_IO_COMPLETION_PORT
2720                         io_completion_port_remove_socket(ep->bfd, ep);
2721 #                   endif
2722                         close_and_delete_fd_from_list(ep->bfd);
2723                         ep->bfd = INVALID_SOCKET;
2724                 }
2725                 ep->flags &= ~INT_BCASTOPEN;
2726         }
2727         broadcast_client_enabled = ISC_FALSE;
2728 }
2729
2730 /*
2731  * io_multicast_add() - add multicast group address
2732  */
2733 void
2734 io_multicast_add(
2735         sockaddr_u *addr
2736         )
2737 {
2738 #ifdef MCAST
2739         endpt * ep;
2740         endpt * one_ep;
2741
2742         /*
2743          * Check to see if this is a multicast address
2744          */
2745         if (!addr_ismulticast(addr))
2746                 return;
2747
2748         /* If we already have it we can just return */
2749         if (NULL != find_flagged_addr_in_list(addr, INT_MCASTOPEN)) {
2750                 msyslog(LOG_INFO,
2751                         "Duplicate request found for multicast address %s",
2752                         stoa(addr));
2753                 return;
2754         }
2755
2756 # ifndef MULTICAST_NONEWSOCKET
2757         ep = new_interface(NULL);
2758
2759         /*
2760          * Open a new socket for the multicast address
2761          */
2762         ep->sin = *addr;
2763         SET_PORT(&ep->sin, NTP_PORT);
2764         ep->family = AF(&ep->sin);
2765         AF(&ep->mask) = ep->family;
2766         SET_ONESMASK(&ep->mask);
2767
2768         set_reuseaddr(1);
2769         ep->bfd = INVALID_SOCKET;
2770         ep->fd = open_socket(&ep->sin, 0, 0, ep);
2771         if (ep->fd != INVALID_SOCKET) {
2772                 ep->ignore_packets = ISC_FALSE;
2773                 ep->flags |= INT_MCASTIF;
2774                 ep->ifindex = SCOPE(addr);
2775
2776                 strlcpy(ep->name, "multicast", sizeof(ep->name));
2777                 DPRINT_INTERFACE(2, (ep, "multicast add ", "\n"));
2778                 add_interface(ep);
2779                 log_listen_address(ep);
2780         } else {
2781                 /* bind failed, re-use wildcard interface */
2782                 delete_interface(ep);
2783
2784                 if (IS_IPV4(addr))
2785                         ep = wildipv4;
2786                 else if (IS_IPV6(addr))
2787                         ep = wildipv6;
2788                 else
2789                         ep = NULL;
2790
2791                 if (ep != NULL) {
2792                         /* HACK ! -- stuff in an address */
2793                         /* because we don't bind addr? DH */
2794                         ep->bcast = *addr;
2795                         msyslog(LOG_ERR,
2796                                 "multicast address %s using wildcard interface #%d %s",
2797                                 stoa(addr), ep->ifnum, ep->name);
2798                 } else {
2799                         msyslog(LOG_ERR,
2800                                 "No multicast socket available to use for address %s",
2801                                 stoa(addr));
2802                         return;
2803                 }
2804         }
2805         {       /* in place of the { following for in #else clause */
2806                 one_ep = ep;
2807 # else  /* MULTICAST_NONEWSOCKET follows */
2808         /*
2809          * For the case where we can't use a separate socket (Windows)
2810          * join each applicable endpoint socket to the group address.
2811          */
2812         if (IS_IPV4(addr))
2813                 one_ep = wildipv4;
2814         else
2815                 one_ep = wildipv6;
2816         for (ep = ep_list; ep != NULL; ep = ep->elink) {
2817                 if (ep->ignore_packets || AF(&ep->sin) != AF(addr) ||
2818                     !(INT_MULTICAST & ep->flags) ||
2819                     (INT_LOOPBACK | INT_WILDCARD) & ep->flags)
2820                         continue;
2821                 one_ep = ep;
2822 # endif /* MULTICAST_NONEWSOCKET */
2823                 if (socket_multicast_enable(ep, addr))
2824                         msyslog(LOG_INFO,
2825                                 "Joined %s socket to multicast group %s",
2826                                 stoa(&ep->sin),
2827                                 stoa(addr));
2828         }
2829
2830         add_addr_to_list(addr, one_ep);
2831 #else   /* !MCAST  follows*/
2832         msyslog(LOG_ERR,
2833                 "Can not add multicast address %s: no multicast support",
2834                 stoa(addr));
2835 #endif
2836         return;
2837 }
2838
2839
2840 /*
2841  * io_multicast_del() - delete multicast group address
2842  */
2843 void
2844 io_multicast_del(
2845         sockaddr_u *    addr
2846         )
2847 {
2848 #ifdef MCAST
2849         endpt *iface;
2850
2851         /*
2852          * Check to see if this is a multicast address
2853          */
2854         if (!addr_ismulticast(addr)) {
2855                 msyslog(LOG_ERR, "invalid multicast address %s",
2856                         stoa(addr));
2857                 return;
2858         }
2859
2860         /*
2861          * Disable reception of multicast packets
2862          */
2863         while ((iface = find_flagged_addr_in_list(addr, INT_MCASTOPEN))
2864                != NULL)
2865                 socket_multicast_disable(iface, addr);
2866
2867         delete_addr_from_list(addr);
2868
2869 #else /* not MCAST */
2870         msyslog(LOG_ERR,
2871                 "Can not delete multicast address %s: no multicast support",
2872                 stoa(addr));
2873 #endif /* not MCAST */
2874 }
2875
2876
2877 /*
2878  * open_socket - open a socket, returning the file descriptor
2879  */
2880
2881 static SOCKET
2882 open_socket(
2883         sockaddr_u *    addr,
2884         int             bcast,
2885         int             turn_off_reuse,
2886         endpt *         interf
2887         )
2888 {
2889         SOCKET  fd;
2890         int     errval;
2891         /*
2892          * int is OK for REUSEADR per
2893          * http://www.kohala.com/start/mcast.api.txt
2894          */
2895         int     on = 1;
2896         int     off = 0;
2897
2898         if (IS_IPV6(addr) && !ipv6_works)
2899                 return INVALID_SOCKET;
2900
2901         /* create a datagram (UDP) socket */
2902         fd = socket(AF(addr), SOCK_DGRAM, 0);
2903         if (INVALID_SOCKET == fd) {
2904                 errval = socket_errno();
2905                 msyslog(LOG_ERR,
2906                         "socket(AF_INET%s, SOCK_DGRAM, 0) failed on address %s: %m",
2907                         IS_IPV6(addr) ? "6" : "", stoa(addr));
2908
2909                 if (errval == EPROTONOSUPPORT ||
2910                     errval == EAFNOSUPPORT ||
2911                     errval == EPFNOSUPPORT)
2912                         return (INVALID_SOCKET);
2913
2914                 errno = errval;
2915                 msyslog(LOG_ERR,
2916                         "unexpected socket() error %m code %d (not EPROTONOSUPPORT nor EAFNOSUPPORT nor EPFNOSUPPORT) - exiting",
2917                         errno);
2918                 exit(1);
2919         }
2920
2921 #ifdef SYS_WINNT
2922         connection_reset_fix(fd, addr);
2923 #endif
2924         /*
2925          * Fixup the file descriptor for some systems
2926          * See bug #530 for details of the issue.
2927          */
2928         fd = move_fd(fd);
2929
2930         /*
2931          * set SO_REUSEADDR since we will be binding the same port
2932          * number on each interface according to turn_off_reuse.
2933          * This is undesirable on Windows versions starting with
2934          * Windows XP (numeric version 5.1).
2935          */
2936 #ifdef SYS_WINNT
2937         if (isc_win32os_versioncheck(5, 1, 0, 0) < 0)  /* before 5.1 */
2938 #endif
2939                 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
2940                                (void *)((turn_off_reuse)
2941                                             ? &off
2942                                             : &on),
2943                                sizeof(on))) {
2944
2945                         msyslog(LOG_ERR,
2946                                 "setsockopt SO_REUSEADDR %s fails for address %s: %m",
2947                                 (turn_off_reuse)
2948                                     ? "off"
2949                                     : "on",
2950                                 stoa(addr));
2951                         closesocket(fd);
2952                         return INVALID_SOCKET;
2953                 }
2954 #ifdef SO_EXCLUSIVEADDRUSE
2955         /*
2956          * setting SO_EXCLUSIVEADDRUSE on the wildcard we open
2957          * first will cause more specific binds to fail.
2958          */
2959         if (!(interf->flags & INT_WILDCARD))
2960                 set_excladdruse(fd);
2961 #endif
2962
2963         /*
2964          * IPv4 specific options go here
2965          */
2966         if (IS_IPV4(addr)) {
2967 #if defined(IPPROTO_IP) && defined(IP_TOS)
2968                 if (setsockopt(fd, IPPROTO_IP, IP_TOS, (void *)&qos,
2969                                sizeof(qos)))
2970                         msyslog(LOG_ERR,
2971                                 "setsockopt IP_TOS (%02x) fails on address %s: %m",
2972                                 qos, stoa(addr));
2973 #endif /* IPPROTO_IP && IP_TOS */
2974                 if (bcast)
2975                         socket_broadcast_enable(interf, fd, addr);
2976         }
2977
2978         /*
2979          * IPv6 specific options go here
2980          */
2981         if (IS_IPV6(addr)) {
2982 #if defined(IPPROTO_IPV6) && defined(IPV6_TCLASS)
2983                 if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, (void *)&qos,
2984                                sizeof(qos)))
2985                         msyslog(LOG_ERR,
2986                                 "setsockopt IPV6_TCLASS (%02x) fails on address %s: %m",
2987                                 qos, stoa(addr));
2988 #endif /* IPPROTO_IPV6 && IPV6_TCLASS */
2989 #ifdef IPV6_V6ONLY
2990                 if (isc_net_probe_ipv6only() == ISC_R_SUCCESS
2991                     && setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY,
2992                     (void *)&on, sizeof(on)))
2993                         msyslog(LOG_ERR,
2994                                 "setsockopt IPV6_V6ONLY on fails on address %s: %m",
2995                                 stoa(addr));
2996 #endif
2997 #ifdef IPV6_BINDV6ONLY
2998                 if (setsockopt(fd, IPPROTO_IPV6, IPV6_BINDV6ONLY,
2999                     (void *)&on, sizeof(on)))
3000                         msyslog(LOG_ERR,
3001                                 "setsockopt IPV6_BINDV6ONLY on fails on address %s: %m",
3002                                 stoa(addr));
3003 #endif
3004         }
3005
3006 #ifdef OS_NEEDS_REUSEADDR_FOR_IFADDRBIND
3007         /*
3008          * some OSes don't allow binding to more specific
3009          * addresses if a wildcard address already bound
3010          * to the port and SO_REUSEADDR is not set
3011          */
3012         if (!is_wildcard_addr(addr))
3013                 set_wildcard_reuse(AF(addr), 1);
3014 #endif
3015
3016         /*
3017          * bind the local address.
3018          */
3019         errval = bind(fd, &addr->sa, SOCKLEN(addr));
3020
3021 #ifdef OS_NEEDS_REUSEADDR_FOR_IFADDRBIND
3022         if (!is_wildcard_addr(addr))
3023                 set_wildcard_reuse(AF(addr), 0);
3024 #endif
3025
3026         if (errval < 0) {
3027                 /*
3028                  * Don't log this under all conditions
3029                  */
3030                 if (turn_off_reuse == 0
3031 #ifdef DEBUG
3032                     || debug > 1
3033 #endif
3034                     ) {
3035                         msyslog(LOG_ERR,
3036                                 "bind(%d) AF_INET%s %s#%d%s flags 0x%x failed: %m",
3037                                 fd, IS_IPV6(addr) ? "6" : "",
3038                                 stoa(addr), SRCPORT(addr),
3039                                 IS_MCAST(addr) ? " (multicast)" : "",
3040                                 interf->flags);
3041                 }
3042
3043                 closesocket(fd);
3044
3045                 return INVALID_SOCKET;
3046         }
3047
3048 #ifdef HAVE_TIMESTAMP
3049         {
3050                 if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMP,
3051                                (void *)&on, sizeof(on)))
3052                         msyslog(LOG_DEBUG,
3053                                 "setsockopt SO_TIMESTAMP on fails on address %s: %m",
3054                                 stoa(addr));
3055                 else
3056                         DPRINTF(4, ("setsockopt SO_TIMESTAMP enabled on fd %d address %s\n",
3057                                     fd, stoa(addr)));
3058         }
3059 #endif
3060 #ifdef HAVE_TIMESTAMPNS
3061         {
3062                 if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPNS,
3063                                (void *)&on, sizeof(on)))
3064                         msyslog(LOG_DEBUG,
3065                                 "setsockopt SO_TIMESTAMPNS on fails on address %s: %m",
3066                                 stoa(addr));
3067                 else
3068                         DPRINTF(4, ("setsockopt SO_TIMESTAMPNS enabled on fd %d address %s\n",
3069                                     fd, stoa(addr)));
3070         }
3071 #endif
3072 #ifdef HAVE_BINTIME
3073         {
3074                 if (setsockopt(fd, SOL_SOCKET, SO_BINTIME,
3075                                (void *)&on, sizeof(on)))
3076                         msyslog(LOG_DEBUG,
3077                                 "setsockopt SO_BINTIME on fails on address %s: %m",
3078                                 stoa(addr));
3079                 else
3080                         DPRINTF(4, ("setsockopt SO_BINTIME enabled on fd %d address %s\n",
3081                                     fd, stoa(addr)));
3082         }
3083 #endif
3084
3085         DPRINTF(4, ("bind(%d) AF_INET%s, addr %s%%%d#%d, flags 0x%x\n",
3086                    fd, IS_IPV6(addr) ? "6" : "", stoa(addr),
3087                    SCOPE(addr), SRCPORT(addr), interf->flags));
3088
3089         make_socket_nonblocking(fd);
3090
3091 #ifdef HAVE_SIGNALED_IO
3092         init_socket_sig(fd);
3093 #endif /* not HAVE_SIGNALED_IO */
3094
3095         add_fd_to_list(fd, FD_TYPE_SOCKET);
3096
3097 #if !defined(SYS_WINNT) && !defined(VMS)
3098         DPRINTF(4, ("flags for fd %d: 0x%x\n", fd,
3099                     fcntl(fd, F_GETFL, 0)));
3100 #endif /* SYS_WINNT || VMS */
3101
3102 #if defined(HAVE_IO_COMPLETION_PORT)
3103 /*
3104  * Add the socket to the completion port
3105  */
3106         if (!io_completion_port_add_socket(fd, interf, bcast)) {
3107                 msyslog(LOG_ERR, "unable to set up io completion port - EXITING");
3108                 exit(1);
3109         }
3110 #endif
3111         return fd;
3112 }
3113
3114
3115
3116 /* XXX ELIMINATE sendpkt similar in ntpq.c, ntpdc.c, ntp_io.c, ntptrace.c */
3117 /*
3118  * sendpkt - send a packet to the specified destination. Maintain a
3119  * send error cache so that only the first consecutive error for a
3120  * destination is logged.
3121  */
3122 void
3123 sendpkt(
3124         sockaddr_u *            dest,
3125         struct interface *      ep,
3126         int                     ttl,
3127         struct pkt *            pkt,
3128         int                     len
3129         )
3130 {
3131         endpt * src;
3132         int     ismcast;
3133         int     cc;
3134         int     rc;
3135         u_char  cttl;
3136         l_fp    fp_zero = { { 0 }, 0 };
3137
3138         ismcast = IS_MCAST(dest);
3139         if (!ismcast)
3140                 src = ep;
3141         else
3142                 src = (IS_IPV4(dest))
3143                           ? mc4_list
3144                           : mc6_list;
3145
3146         if (NULL == src) {
3147                 /*
3148                  * unbound peer - drop request and wait for better
3149                  * network conditions
3150                  */
3151                 DPRINTF(2, ("%ssendpkt(dst=%s, ttl=%d, len=%d): no interface - IGNORED\n",
3152                             ismcast ? "\tMCAST\t***** " : "",
3153                             stoa(dest), ttl, len));
3154                 return;
3155         }
3156
3157         do {
3158                 DPRINTF(2, ("%ssendpkt(%d, dst=%s, src=%s, ttl=%d, len=%d)\n",
3159                             ismcast ? "\tMCAST\t***** " : "", src->fd,
3160                             stoa(dest), stoa(&src->sin), ttl, len));
3161 #ifdef MCAST
3162                 /*
3163                  * for the moment we use the bcast option to set multicast ttl
3164                  */
3165                 if (ismcast && ttl > 0 && ttl != src->last_ttl) {
3166                         /*
3167                          * set the multicast ttl for outgoing packets
3168                          */
3169                         switch (AF(&src->sin)) {
3170
3171                         case AF_INET :
3172                                 cttl = (u_char)ttl;
3173                                 rc = setsockopt(src->fd, IPPROTO_IP,
3174                                                 IP_MULTICAST_TTL,
3175                                                 (void *)&cttl,
3176                                                 sizeof(cttl));
3177                                 break;
3178
3179 # ifdef INCLUDE_IPV6_SUPPORT
3180                         case AF_INET6 :
3181                                 rc = setsockopt(src->fd, IPPROTO_IPV6,
3182                                                  IPV6_MULTICAST_HOPS,
3183                                                  (void *)&ttl,
3184                                                  sizeof(ttl));
3185                                 break;
3186 # endif /* INCLUDE_IPV6_SUPPORT */
3187
3188                         default:
3189                                 rc = 0;
3190                         }
3191
3192                         if (!rc)
3193                                 src->last_ttl = ttl;
3194                         else
3195                                 msyslog(LOG_ERR,
3196                                         "setsockopt IP_MULTICAST_TTL/IPV6_MULTICAST_HOPS fails on address %s: %m",
3197                                         stoa(&src->sin));
3198                 }
3199 #endif  /* MCAST */
3200
3201 #ifdef SIM
3202                 cc = simulate_server(dest, src, pkt);
3203 #elif defined(HAVE_IO_COMPLETION_PORT)
3204                 cc = io_completion_port_sendto(src, src->fd, pkt,
3205                         (size_t)len, (sockaddr_u *)&dest->sa);
3206 #else
3207                 cc = sendto(src->fd, (char *)pkt, (u_int)len, 0,
3208                             &dest->sa, SOCKLEN(dest));
3209 #endif
3210                 if (cc == -1) {
3211                         src->notsent++;
3212                         packets_notsent++;
3213                 } else  {
3214                         src->sent++;
3215                         packets_sent++;
3216                 }
3217                 if (ismcast)
3218                         src = src->mclink;
3219         } while (ismcast && src != NULL);
3220
3221         /* HMS: pkt->rootdisp is usually random here */
3222         record_raw_stats(src ? &src->sin : NULL, dest,
3223                         &pkt->org, &pkt->rec, &pkt->xmt, &fp_zero,
3224                         PKT_MODE(pkt->li_vn_mode),
3225                         PKT_VERSION(pkt->li_vn_mode),
3226                         PKT_LEAP(pkt->li_vn_mode),
3227                         pkt->stratum,
3228                         pkt->ppoll, pkt->precision,
3229                         pkt->rootdelay, pkt->rootdisp, pkt->refid,
3230                         len - MIN_V4_PKT_LEN, (u_char *)&pkt->exten);
3231
3232         return;
3233 }
3234
3235
3236 #if !defined(HAVE_IO_COMPLETION_PORT)
3237 #if !defined(HAVE_SIGNALED_IO)
3238 /*
3239  * fdbits - generate ascii representation of fd_set (FAU debug support)
3240  * HFDF format - highest fd first.
3241  */
3242 static char *
3243 fdbits(
3244         int             count,
3245         const fd_set*   set
3246         )
3247 {
3248         static char buffer[256];
3249         char * buf = buffer;
3250
3251         count = min(count,  255);
3252
3253         while (count >= 0) {
3254                 *buf++ = FD_ISSET(count, set) ? '#' : '-';
3255                 count--;
3256         }
3257         *buf = '\0';
3258
3259         return buffer;
3260 }
3261 #endif
3262
3263 #ifdef REFCLOCK
3264 /*
3265  * Routine to read the refclock packets for a specific interface
3266  * Return the number of bytes read. That way we know if we should
3267  * read it again or go on to the next one if no bytes returned
3268  */
3269 static inline int
3270 read_refclock_packet(
3271         SOCKET                  fd,
3272         struct refclockio *     rp,
3273         l_fp                    ts
3274         )
3275 {
3276         u_int                   read_count;
3277         int                     buflen;
3278         int                     saved_errno;
3279         int                     consumed;
3280         struct recvbuf *        rb;
3281
3282         rb = get_free_recv_buffer();
3283
3284         if (NULL == rb) {
3285                 /*
3286                  * No buffer space available - just drop the packet
3287                  */
3288                 char buf[RX_BUFF_SIZE];
3289
3290                 buflen = read(fd, buf, sizeof buf);
3291                 packets_dropped++;
3292                 return (buflen);
3293         }
3294
3295         /* TALOS-CAN-0064: avoid signed/unsigned clashes that can lead
3296          * to buffer overrun and memory corruption
3297          */
3298         if (rp->datalen <= 0 || (size_t)rp->datalen > sizeof(rb->recv_space))
3299                 read_count = sizeof(rb->recv_space);
3300         else
3301                 read_count = (u_int)rp->datalen;
3302         do {
3303                 buflen = read(fd, (char *)&rb->recv_space, read_count);
3304         } while (buflen < 0 && EINTR == errno);
3305
3306         if (buflen <= 0) {
3307                 saved_errno = errno;
3308                 freerecvbuf(rb);
3309                 errno = saved_errno;
3310                 return buflen;
3311         }
3312
3313         /*
3314          * Got one. Mark how and when it got here,
3315          * put it on the full list and do bookkeeping.
3316          */
3317         rb->recv_length = buflen;
3318         rb->recv_peer = rp->srcclock;
3319         rb->dstadr = 0;
3320         rb->fd = fd;
3321         rb->recv_time = ts;
3322         rb->receiver = rp->clock_recv;
3323
3324         consumed = indicate_refclock_packet(rp, rb);
3325         if (!consumed) {
3326                 rp->recvcount++;
3327                 packets_received++;
3328         }
3329
3330         return buflen;
3331 }
3332 #endif  /* REFCLOCK */
3333
3334
3335 #ifdef HAVE_PACKET_TIMESTAMP
3336 /*
3337  * extract timestamps from control message buffer
3338  */
3339 static l_fp
3340 fetch_timestamp(
3341         struct recvbuf *        rb,
3342         struct msghdr *         msghdr,
3343         l_fp                    ts
3344         )
3345 {
3346         struct cmsghdr *        cmsghdr;
3347         unsigned long           ticks;
3348         double                  fuzz;
3349         l_fp                    lfpfuzz;
3350         l_fp                    nts;
3351 #ifdef DEBUG_TIMING
3352         l_fp                    dts;
3353 #endif
3354
3355         cmsghdr = CMSG_FIRSTHDR(msghdr);
3356         while (cmsghdr != NULL) {
3357                 switch (cmsghdr->cmsg_type)
3358                 {
3359 #ifdef HAVE_BINTIME
3360                 case SCM_BINTIME:
3361 #endif  /* HAVE_BINTIME */
3362 #ifdef HAVE_TIMESTAMPNS
3363                 case SCM_TIMESTAMPNS:
3364 #endif  /* HAVE_TIMESTAMPNS */
3365 #ifdef HAVE_TIMESTAMP
3366                 case SCM_TIMESTAMP:
3367 #endif  /* HAVE_TIMESTAMP */
3368 #if defined(HAVE_BINTIME) || defined (HAVE_TIMESTAMPNS) || defined(HAVE_TIMESTAMP)
3369                         switch (cmsghdr->cmsg_type)
3370                         {
3371 #ifdef HAVE_BINTIME
3372                         case SCM_BINTIME:
3373                                 {
3374                                         struct bintime  pbt;
3375                                         memcpy(&pbt, CMSG_DATA(cmsghdr), sizeof(pbt));
3376                                         /*
3377                                          * bintime documentation is at http://phk.freebsd.dk/pubs/timecounter.pdf
3378                                          */
3379                                         nts.l_i = pbt.sec + JAN_1970;
3380                                         nts.l_uf = (u_int32)(pbt.frac >> 32);
3381                                         if (sys_tick > measured_tick &&
3382                                             sys_tick > 1e-9) {
3383                                                 ticks = (unsigned long)(nts.l_uf / (unsigned long)(sys_tick * FRAC));
3384                                                 nts.l_uf = (unsigned long)(ticks * (unsigned long)(sys_tick * FRAC));
3385                                         }
3386                                         DPRINTF(4, ("fetch_timestamp: system bintime network time stamp: %ld.%09lu\n",
3387                                                     pbt.sec, (unsigned long)((nts.l_uf / FRAC) * 1e9)));
3388                                 }
3389                                 break;
3390 #endif  /* HAVE_BINTIME */
3391 #ifdef HAVE_TIMESTAMPNS
3392                         case SCM_TIMESTAMPNS:
3393                                 {
3394                                         struct timespec pts;
3395                                         memcpy(&pts, CMSG_DATA(cmsghdr), sizeof(pts));
3396                                         if (sys_tick > measured_tick &&
3397                                             sys_tick > 1e-9) {
3398                                                 ticks = (unsigned long)((pts.tv_nsec * 1e-9) /
3399                                                                         sys_tick);
3400                                                 pts.tv_nsec = (long)(ticks * 1e9 *
3401                                                                      sys_tick);
3402                                         }
3403                                         DPRINTF(4, ("fetch_timestamp: system nsec network time stamp: %ld.%09ld\n",
3404                                                     pts.tv_sec, pts.tv_nsec));
3405                                         nts = tspec_stamp_to_lfp(pts);
3406                                 }
3407                                 break;
3408 #endif  /* HAVE_TIMESTAMPNS */
3409 #ifdef HAVE_TIMESTAMP
3410                         case SCM_TIMESTAMP:
3411                                 {
3412                                         struct timeval  ptv;
3413                                         memcpy(&ptv, CMSG_DATA(cmsghdr), sizeof(ptv));
3414                                         if (sys_tick > measured_tick &&
3415                                             sys_tick > 1e-6) {
3416                                                 ticks = (unsigned long)((ptv.tv_usec * 1e-6) /
3417                                                                         sys_tick);
3418                                                 ptv.tv_usec = (long)(ticks * 1e6 *
3419                                                                     sys_tick);
3420                                         }
3421                                         DPRINTF(4, ("fetch_timestamp: system usec network time stamp: %jd.%06ld\n",
3422                                                     (intmax_t)ptv.tv_sec, (long)ptv.tv_usec));
3423                                         nts = tval_stamp_to_lfp(ptv);
3424                                 }
3425                                 break;
3426 #endif  /* HAVE_TIMESTAMP */
3427                         }
3428                         fuzz = ntp_random() * 2. / FRAC * sys_fuzz;
3429                         DTOLFP(fuzz, &lfpfuzz);
3430                         L_ADD(&nts, &lfpfuzz);
3431 #ifdef DEBUG_TIMING
3432                         dts = ts;
3433                         L_SUB(&dts, &nts);
3434                         collect_timing(rb, "input processing delay", 1,
3435                                        &dts);
3436                         DPRINTF(4, ("fetch_timestamp: timestamp delta: %s (incl. fuzz)\n",
3437                                     lfptoa(&dts, 9)));
3438 #endif  /* DEBUG_TIMING */
3439                         ts = nts;  /* network time stamp */
3440                         break;
3441 #endif  /* HAVE_BINTIME || HAVE_TIMESTAMPNS || HAVE_TIMESTAMP */
3442
3443                 default:
3444                         DPRINTF(4, ("fetch_timestamp: skipping control message 0x%x\n",
3445                                     cmsghdr->cmsg_type));
3446                 }
3447                 cmsghdr = CMSG_NXTHDR(msghdr, cmsghdr);
3448         }
3449         return ts;
3450 }
3451 #endif  /* HAVE_PACKET_TIMESTAMP */
3452
3453
3454 /*
3455  * Routine to read the network NTP packets for a specific interface
3456  * Return the number of bytes read. That way we know if we should
3457  * read it again or go on to the next one if no bytes returned
3458  */
3459 static inline int
3460 read_network_packet(
3461         SOCKET                  fd,
3462         struct interface *      itf,
3463         l_fp                    ts
3464         )
3465 {
3466         GETSOCKNAME_SOCKLEN_TYPE fromlen;
3467         int buflen;
3468         register struct recvbuf *rb;
3469 #ifdef HAVE_PACKET_TIMESTAMP
3470         struct msghdr msghdr;
3471         struct iovec iovec;
3472         char control[CMSG_BUFSIZE];
3473 #endif
3474
3475         /*
3476          * Get a buffer and read the frame.  If we
3477          * haven't got a buffer, or this is received
3478          * on a disallowed socket, just dump the
3479          * packet.
3480          */
3481
3482         rb = get_free_recv_buffer();
3483         if (NULL == rb || itf->ignore_packets) {
3484                 char buf[RX_BUFF_SIZE];
3485                 sockaddr_u from;
3486
3487                 if (rb != NULL)
3488                         freerecvbuf(rb);
3489
3490                 fromlen = sizeof(from);
3491                 buflen = recvfrom(fd, buf, sizeof(buf), 0,
3492                                   &from.sa, &fromlen);
3493                 DPRINTF(4, ("%s on (%lu) fd=%d from %s\n",
3494                         (itf->ignore_packets)
3495                             ? "ignore"
3496                             : "drop",
3497                         free_recvbuffs(), fd, stoa(&from)));
3498                 if (itf->ignore_packets)
3499                         packets_ignored++;
3500                 else
3501                         packets_dropped++;
3502                 return (buflen);
3503         }
3504
3505         fromlen = sizeof(rb->recv_srcadr);
3506
3507 #ifndef HAVE_PACKET_TIMESTAMP
3508         rb->recv_length = recvfrom(fd, (char *)&rb->recv_space,
3509                                    sizeof(rb->recv_space), 0,
3510                                    &rb->recv_srcadr.sa, &fromlen);
3511 #else
3512         iovec.iov_base        = &rb->recv_space;
3513         iovec.iov_len         = sizeof(rb->recv_space);
3514         msghdr.msg_name       = &rb->recv_srcadr;
3515         msghdr.msg_namelen    = fromlen;
3516         msghdr.msg_iov        = &iovec;
3517         msghdr.msg_iovlen     = 1;
3518         msghdr.msg_control    = (void *)&control;
3519         msghdr.msg_controllen = sizeof(control);
3520         msghdr.msg_flags      = 0;
3521         rb->recv_length       = recvmsg(fd, &msghdr, 0);
3522 #endif
3523
3524         buflen = rb->recv_length;
3525
3526         if (buflen == 0 || (buflen == -1 &&
3527             (EWOULDBLOCK == errno
3528 #ifdef EAGAIN
3529              || EAGAIN == errno
3530 #endif
3531              ))) {
3532                 freerecvbuf(rb);
3533                 return (buflen);
3534         } else if (buflen < 0) {
3535                 msyslog(LOG_ERR, "recvfrom(%s) fd=%d: %m",
3536                         stoa(&rb->recv_srcadr), fd);
3537                 DPRINTF(5, ("read_network_packet: fd=%d dropped (bad recvfrom)\n",
3538                             fd));
3539                 freerecvbuf(rb);
3540                 return (buflen);
3541         }
3542
3543         DPRINTF(3, ("read_network_packet: fd=%d length %d from %s\n",
3544                     fd, buflen, stoa(&rb->recv_srcadr)));
3545
3546 #ifdef ENABLE_BUG3020_FIX
3547         if (ISREFCLOCKADR(&rb->recv_srcadr)) {
3548                 msyslog(LOG_ERR, "recvfrom(%s) fd=%d: refclock srcadr on a network interface!",
3549                         stoa(&rb->recv_srcadr), fd);
3550                 DPRINTF(1, ("read_network_packet: fd=%d dropped (refclock srcadr))\n",
3551                             fd));
3552                 packets_dropped++;
3553                 freerecvbuf(rb);
3554                 return (buflen);
3555         }
3556 #endif
3557
3558         /*
3559         ** Bug 2672: Some OSes (MacOSX and Linux) don't block spoofed ::1
3560         */
3561
3562         if (AF_INET6 == itf->family) {
3563                 DPRINTF(2, ("Got an IPv6 packet, from <%s> (%d) to <%s> (%d)\n",
3564                         stoa(&rb->recv_srcadr),
3565                         IN6_IS_ADDR_LOOPBACK(PSOCK_ADDR6(&rb->recv_srcadr)),
3566                         stoa(&itf->sin),
3567                         !IN6_IS_ADDR_LOOPBACK(PSOCK_ADDR6(&itf->sin))
3568                         ));
3569
3570                 if (   IN6_IS_ADDR_LOOPBACK(PSOCK_ADDR6(&rb->recv_srcadr))
3571                     && !IN6_IS_ADDR_LOOPBACK(PSOCK_ADDR6(&itf->sin))
3572                    ) {
3573                         packets_dropped++;
3574                         DPRINTF(2, ("DROPPING that packet\n"));
3575                         freerecvbuf(rb);
3576                         return buflen;
3577                 }
3578                 DPRINTF(2, ("processing that packet\n"));
3579         }
3580
3581         /*
3582          * Got one.  Mark how and when it got here,
3583          * put it on the full list and do bookkeeping.
3584          */
3585         rb->dstadr = itf;
3586         rb->fd = fd;
3587 #ifdef HAVE_PACKET_TIMESTAMP
3588         /* pick up a network time stamp if possible */
3589         ts = fetch_timestamp(rb, &msghdr, ts);
3590 #endif
3591         rb->recv_time = ts;
3592         rb->receiver = receive;
3593
3594         add_full_recv_buffer(rb);
3595
3596         itf->received++;
3597         packets_received++;
3598         return (buflen);
3599 }
3600
3601 /*
3602  * attempt to handle io (select()/signaled IO)
3603  */
3604 void
3605 io_handler(void)
3606 {
3607 #  ifndef HAVE_SIGNALED_IO
3608         fd_set rdfdes;
3609         int nfound;
3610
3611         /*
3612          * Use select() on all on all input fd's for unlimited
3613          * time.  select() will terminate on SIGALARM or on the
3614          * reception of input.  Using select() means we can't do
3615          * robust signal handling and we get a potential race
3616          * between checking for alarms and doing the select().
3617          * Mostly harmless, I think.
3618          */
3619         /*
3620          * On VMS, I suspect that select() can't be interrupted
3621          * by a "signal" either, so I take the easy way out and
3622          * have select() time out after one second.
3623          * System clock updates really aren't time-critical,
3624          * and - lacking a hardware reference clock - I have
3625          * yet to learn about anything else that is.
3626          */
3627         ++handler_calls;
3628         rdfdes = activefds;
3629 #   if !defined(VMS) && !defined(SYS_VXWORKS)
3630         nfound = select(maxactivefd + 1, &rdfdes, NULL,
3631                         NULL, NULL);
3632 #   else        /* VMS, VxWorks */
3633         /* make select() wake up after one second */
3634         {
3635                 struct timeval t1;
3636                 t1.tv_sec  = 1;
3637                 t1.tv_usec = 0;
3638                 nfound = select(maxactivefd + 1,
3639                                 &rdfdes, NULL, NULL,
3640                                 &t1);
3641         }
3642 #   endif       /* VMS, VxWorks */
3643         if (nfound < 0 && sanitize_fdset(errno)) {
3644                 struct timeval t1;
3645                 t1.tv_sec  = 0;
3646                 t1.tv_usec = 0;
3647                 rdfdes = activefds;
3648                 nfound = select(maxactivefd + 1,
3649                                 &rdfdes, NULL, NULL,
3650                                 &t1);
3651         }
3652
3653         if (nfound > 0) {
3654                 l_fp ts;
3655
3656                 get_systime(&ts);
3657
3658                 input_handler_scan(&ts, &rdfdes);
3659         } else if (nfound == -1 && errno != EINTR) {
3660                 msyslog(LOG_ERR, "select() error: %m");
3661         }
3662 #   ifdef DEBUG
3663         else if (debug > 4) {
3664                 msyslog(LOG_DEBUG, "select(): nfound=%d, error: %m", nfound);
3665         } else {
3666                 DPRINTF(3, ("select() returned %d: %m\n", nfound));
3667         }
3668 #   endif /* DEBUG */
3669 #  else /* HAVE_SIGNALED_IO */
3670         wait_for_signal();
3671 #  endif /* HAVE_SIGNALED_IO */
3672 }
3673
3674 #ifdef HAVE_SIGNALED_IO
3675 /*
3676  * input_handler - receive packets asynchronously
3677  *
3678  * ALWAYS IN SIGNAL HANDLER CONTEXT -- only async-safe functions allowed!
3679  */
3680 static RETSIGTYPE
3681 input_handler(
3682         l_fp *  cts
3683         )
3684 {
3685         int             n;
3686         struct timeval  tvzero;
3687         fd_set          fds;
3688
3689         ++handler_calls;
3690
3691         /*
3692          * Do a poll to see who has data
3693          */
3694
3695         fds = activefds;
3696         tvzero.tv_sec = tvzero.tv_usec = 0;
3697
3698         n = select(maxactivefd + 1, &fds, NULL, NULL, &tvzero);
3699         if (n < 0 && sanitize_fdset(errno)) {
3700                 fds = activefds;
3701                 tvzero.tv_sec = tvzero.tv_usec = 0;
3702                 n = select(maxactivefd + 1, &fds, NULL, NULL, &tvzero);
3703         }
3704         if (n > 0)
3705                 input_handler_scan(cts, &fds);
3706 }
3707 #endif /* HAVE_SIGNALED_IO */
3708
3709
3710 /*
3711  * Try to sanitize the global FD set
3712  *
3713  * SIGNAL HANDLER CONTEXT if HAVE_SIGNALED_IO, ordinary userspace otherwise
3714  */
3715 static int/*BOOL*/
3716 sanitize_fdset(
3717         int     errc
3718         )
3719 {
3720         int j, b, maxscan;
3721
3722 #  ifndef HAVE_SIGNALED_IO
3723         /*
3724          * extended FAU debugging output
3725          */
3726         if (errc != EINTR) {
3727                 msyslog(LOG_ERR,
3728                         "select(%d, %s, 0L, 0L, &0.0) error: %m",
3729                         maxactivefd + 1,
3730                         fdbits(maxactivefd, &activefds));
3731         }
3732 #   endif
3733
3734         if (errc != EBADF)
3735                 return FALSE;
3736
3737         /* if we have oviously bad FDs, try to sanitize the FD set. */
3738         for (j = 0, maxscan = 0; j <= maxactivefd; j++) {
3739                 if (FD_ISSET(j, &activefds)) {
3740                         if (-1 != read(j, &b, 0)) {
3741                                 maxscan = j;
3742                                 continue;
3743                         }
3744 #                   ifndef HAVE_SIGNALED_IO
3745                         msyslog(LOG_ERR,
3746                                 "Removing bad file descriptor %d from select set",
3747                                 j);
3748 #                   endif
3749                         FD_CLR(j, &activefds);
3750                 }
3751         }
3752         if (maxactivefd != maxscan)
3753                 maxactivefd = maxscan;
3754         return TRUE;
3755 }
3756
3757 /*
3758  * scan the known FDs (clocks, servers, ...) for presence in a 'fd_set'.
3759  *
3760  * SIGNAL HANDLER CONTEXT if HAVE_SIGNALED_IO, ordinary userspace otherwise
3761  */
3762 static void
3763 input_handler_scan(
3764         const l_fp *    cts,
3765         const fd_set *  pfds
3766         )
3767 {
3768         int             buflen;
3769         u_int           idx;
3770         int             doing;
3771         SOCKET          fd;
3772         blocking_child *c;
3773         l_fp            ts;     /* Timestamp at BOselect() gob */
3774
3775 #if defined(DEBUG_TIMING)
3776         l_fp            ts_e;   /* Timestamp at EOselect() gob */
3777 #endif
3778         endpt *         ep;
3779 #ifdef REFCLOCK
3780         struct refclockio *rp;
3781         int             saved_errno;
3782         const char *    clk;
3783 #endif
3784 #ifdef HAS_ROUTING_SOCKET
3785         struct asyncio_reader * asyncio_reader;
3786         struct asyncio_reader * next_asyncio_reader;
3787 #endif
3788
3789         ++handler_pkts;
3790         ts = *cts;
3791
3792 #ifdef REFCLOCK
3793         /*
3794          * Check out the reference clocks first, if any
3795          */
3796
3797         for (rp = refio; rp != NULL; rp = rp->next) {
3798                 fd = rp->fd;
3799
3800                 if (!FD_ISSET(fd, pfds))
3801                         continue;
3802                 buflen = read_refclock_packet(fd, rp, ts);
3803                 /*
3804                  * The first read must succeed after select() indicates
3805                  * readability, or we've reached a permanent EOF.
3806                  * http://bugs.ntp.org/1732 reported ntpd munching CPU
3807                  * after a USB GPS was unplugged because select was
3808                  * indicating EOF but ntpd didn't remove the descriptor
3809                  * from the activefds set.
3810                  */
3811                 if (buflen < 0 && EAGAIN != errno) {
3812                         saved_errno = errno;
3813                         clk = refnumtoa(&rp->srcclock->srcadr);
3814                         errno = saved_errno;
3815                         msyslog(LOG_ERR, "%s read: %m", clk);
3816                         maintain_activefds(fd, TRUE);
3817                 } else if (0 == buflen) {
3818                         clk = refnumtoa(&rp->srcclock->srcadr);
3819                         msyslog(LOG_ERR, "%s read EOF", clk);
3820                         maintain_activefds(fd, TRUE);
3821                 } else {
3822                         /* drain any remaining refclock input */
3823                         do {
3824                                 buflen = read_refclock_packet(fd, rp, ts);
3825                         } while (buflen > 0);
3826                 }
3827         }
3828 #endif /* REFCLOCK */
3829
3830         /*
3831          * Loop through the interfaces looking for data to read.
3832          */
3833         for (ep = ep_list; ep != NULL; ep = ep->elink) {
3834                 for (doing = 0; doing < 2; doing++) {
3835                         if (!doing) {
3836                                 fd = ep->fd;
3837                         } else {
3838                                 if (!(ep->flags & INT_BCASTOPEN))
3839                                         break;
3840                                 fd = ep->bfd;
3841                         }
3842                         if (fd < 0)
3843                                 continue;
3844                         if (FD_ISSET(fd, pfds))
3845                                 do {
3846                                         buflen = read_network_packet(
3847                                                         fd, ep, ts);
3848                                 } while (buflen > 0);
3849                         /* Check more interfaces */
3850                 }
3851         }
3852
3853 #ifdef HAS_ROUTING_SOCKET
3854         /*
3855          * scan list of asyncio readers - currently only used for routing sockets
3856          */
3857         asyncio_reader = asyncio_reader_list;
3858
3859         while (asyncio_reader != NULL) {
3860                 /* callback may unlink and free asyncio_reader */
3861                 next_asyncio_reader = asyncio_reader->link;
3862                 if (FD_ISSET(asyncio_reader->fd, pfds))
3863                         (*asyncio_reader->receiver)(asyncio_reader);
3864                 asyncio_reader = next_asyncio_reader;
3865         }
3866 #endif /* HAS_ROUTING_SOCKET */
3867
3868         /*
3869          * Check for a response from a blocking child
3870          */
3871         for (idx = 0; idx < blocking_children_alloc; idx++) {
3872                 c = blocking_children[idx];
3873                 if (NULL == c || -1 == c->resp_read_pipe)
3874                         continue;
3875                 if (FD_ISSET(c->resp_read_pipe, pfds)) {
3876                         ++c->resp_ready_seen;
3877                         ++blocking_child_ready_seen;
3878                 }
3879         }
3880
3881         /* We've done our work */
3882 #if defined(DEBUG_TIMING)
3883         get_systime(&ts_e);
3884         /*
3885          * (ts_e - ts) is the amount of time we spent
3886          * processing this gob of file descriptors.  Log
3887          * it.
3888          */
3889         L_SUB(&ts_e, &ts);
3890         collect_timing(NULL, "input handler", 1, &ts_e);
3891         if (debug > 3)
3892                 msyslog(LOG_DEBUG,
3893                         "input_handler: Processed a gob of fd's in %s msec",
3894                         lfptoms(&ts_e, 6));
3895 #endif /* DEBUG_TIMING */
3896 }
3897 #endif /* !HAVE_IO_COMPLETION_PORT */
3898
3899 /*
3900  * find an interface suitable for the src address
3901  */
3902 endpt *
3903 select_peerinterface(
3904         struct peer *   peer,
3905         sockaddr_u *    srcadr,
3906         endpt *         dstadr
3907         )
3908 {
3909         endpt *ep;
3910 #ifndef SIM
3911         endpt *wild;
3912
3913         wild = ANY_INTERFACE_CHOOSE(srcadr);
3914
3915         /*
3916          * Initialize the peer structure and dance the interface jig.
3917          * Reference clocks step the loopback waltz, the others
3918          * squaredance around the interface list looking for a buddy. If
3919          * the dance peters out, there is always the wildcard interface.
3920          * This might happen in some systems and would preclude proper
3921          * operation with public key cryptography.
3922          */
3923         if (ISREFCLOCKADR(srcadr)) {
3924                 ep = loopback_interface;
3925         } else if (peer->cast_flags &
3926                    (MDF_BCLNT | MDF_ACAST | MDF_MCAST | MDF_BCAST)) {
3927                 ep = findbcastinter(srcadr);
3928                 if (ep != NULL)
3929                         DPRINTF(4, ("Found *-cast interface %s for address %s\n",
3930                                 stoa(&ep->sin), stoa(srcadr)));
3931                 else
3932                         DPRINTF(4, ("No *-cast local address found for address %s\n",
3933                                 stoa(srcadr)));
3934         } else {
3935                 ep = dstadr;
3936                 if (NULL == ep)
3937                         ep = wild;
3938         }
3939         /*
3940          * If it is a multicast address, findbcastinter() may not find
3941          * it.  For unicast, we get to find the interface when dstadr is
3942          * given to us as the wildcard (ANY_INTERFACE_CHOOSE).  Either
3943          * way, try a little harder.
3944          */
3945         if (wild == ep)
3946                 ep = findinterface(srcadr);
3947         /*
3948          * we do not bind to the wildcard interfaces for output
3949          * as our (network) source address would be undefined and
3950          * crypto will not work without knowing the own transmit address
3951          */
3952         if (ep != NULL && INT_WILDCARD & ep->flags)
3953                 if (!accept_wildcard_if_for_winnt)
3954                         ep = NULL;
3955 #else   /* SIM follows */
3956         ep = loopback_interface;
3957 #endif
3958
3959         return ep;
3960 }
3961
3962
3963 /*
3964  * findinterface - find local interface corresponding to address
3965  */
3966 endpt *
3967 findinterface(
3968         sockaddr_u *addr
3969         )
3970 {
3971         endpt *iface;
3972
3973         iface = findlocalinterface(addr, INT_WILDCARD, 0);
3974
3975         if (NULL == iface) {
3976                 DPRINTF(4, ("Found no interface for address %s - returning wildcard\n",
3977                             stoa(addr)));
3978
3979                 iface = ANY_INTERFACE_CHOOSE(addr);
3980         } else
3981                 DPRINTF(4, ("Found interface #%d %s for address %s\n",
3982                             iface->ifnum, iface->name, stoa(addr)));
3983
3984         return iface;
3985 }
3986
3987 /*
3988  * findlocalinterface - find local interface corresponding to addr,
3989  * which does not have any of flags set.  If bast is nonzero, addr is
3990  * a broadcast address.
3991  *
3992  * This code attempts to find the local sending address for an outgoing
3993  * address by connecting a new socket to destinationaddress:NTP_PORT
3994  * and reading the sockname of the resulting connect.
3995  * the complicated sequence simulates the routing table lookup
3996  * for to first hop without duplicating any of the routing logic into
3997  * ntpd. preferably we would have used an API call - but its not there -
3998  * so this is the best we can do here short of duplicating to entire routing
3999  * logic in ntpd which would be a silly and really unportable thing to do.
4000  *
4001  */
4002 static endpt *
4003 findlocalinterface(
4004         sockaddr_u *    addr,
4005         int             flags,
4006         int             bcast
4007         )
4008 {
4009         GETSOCKNAME_SOCKLEN_TYPE        sockaddrlen;
4010         endpt *                         iface;
4011         sockaddr_u                      saddr;
4012         SOCKET                          s;
4013         int                             rtn;
4014         int                             on;
4015
4016         DPRINTF(4, ("Finding interface for addr %s in list of addresses\n",
4017                     stoa(addr)));
4018
4019         /* [Bug 3437] The dummy POOL peer comes in with an AF of
4020          * zero. This is bound to fail, but on the way to nowhere it
4021          * triggers a security incident on SELinux.
4022          *
4023          * Checking the condition and failing early is probably a good
4024          * advice, and even saves us some syscalls in that case.
4025          * Thanks to Miroslav Lichvar for finding this.
4026          */
4027         if (AF_UNSPEC == AF(addr))
4028                 return NULL;
4029
4030         s = socket(AF(addr), SOCK_DGRAM, 0);
4031         if (INVALID_SOCKET == s)
4032                 return NULL;
4033
4034         /*
4035          * If we are looking for broadcast interface we need to set this
4036          * socket to allow broadcast
4037          */
4038         if (bcast) {
4039                 on = 1;
4040                 if (SOCKET_ERROR == setsockopt(s, SOL_SOCKET,
4041                                                 SO_BROADCAST,
4042                                                 (void *)&on,
4043                                                 sizeof(on))) {
4044                         closesocket(s);
4045                         return NULL;
4046                 }
4047         }
4048
4049         rtn = connect(s, &addr->sa, SOCKLEN(addr));
4050         if (SOCKET_ERROR == rtn) {
4051                 closesocket(s);
4052                 return NULL;
4053         }
4054
4055         sockaddrlen = sizeof(saddr);
4056         rtn = getsockname(s, &saddr.sa, &sockaddrlen);
4057         closesocket(s);
4058         if (SOCKET_ERROR == rtn)
4059                 return NULL;
4060
4061         DPRINTF(4, ("findlocalinterface: kernel maps %s to %s\n",
4062                     stoa(addr), stoa(&saddr)));
4063
4064         iface = getinterface(&saddr, flags);
4065
4066         /*
4067          * if we didn't find an exact match on saddr, find the closest
4068          * available local address.  This handles the case of the
4069          * address suggested by the kernel being excluded by nic rules
4070          * or the user's -I and -L options to ntpd.
4071          * See http://bugs.ntp.org/1184 and http://bugs.ntp.org/1683
4072          * for more background.
4073          */
4074         if (NULL == iface || iface->ignore_packets)
4075                 iface = findclosestinterface(&saddr,
4076                                              flags | INT_LOOPBACK);
4077
4078         /* Don't use an interface which will ignore replies */
4079         if (iface != NULL && iface->ignore_packets)
4080                 iface = NULL;
4081
4082         return iface;
4083 }
4084
4085
4086 /*
4087  * findclosestinterface
4088  *
4089  * If there are -I/--interface or -L/novirtualips command-line options,
4090  * or "nic" or "interface" rules in ntp.conf, findlocalinterface() may
4091  * find the kernel's preferred local address for a given peer address is
4092  * administratively unavailable to ntpd, and punt to this routine's more
4093  * expensive search.
4094  *
4095  * Find the numerically closest local address to the one connect()
4096  * suggested.  This matches an address on the same subnet first, as
4097  * needed by Bug 1184, and provides a consistent choice if there are
4098  * multiple feasible local addresses, regardless of the order ntpd
4099  * enumerated them.
4100  */
4101 endpt *
4102 findclosestinterface(
4103         sockaddr_u *    addr,
4104         int             flags
4105         )
4106 {
4107         endpt *         ep;
4108         endpt *         winner;
4109         sockaddr_u      addr_dist;
4110         sockaddr_u      min_dist;
4111
4112         ZERO_SOCK(&min_dist);
4113         winner = NULL;
4114
4115         for (ep = ep_list; ep != NULL; ep = ep->elink) {
4116                 if (ep->ignore_packets ||
4117                     AF(addr) != ep->family ||
4118                     flags & ep->flags)
4119                         continue;
4120
4121                 calc_addr_distance(&addr_dist, addr, &ep->sin);
4122                 if (NULL == winner ||
4123                     -1 == cmp_addr_distance(&addr_dist, &min_dist)) {
4124                         min_dist = addr_dist;
4125                         winner = ep;
4126                 }
4127         }
4128         if (NULL == winner)
4129                 DPRINTF(4, ("findclosestinterface(%s) failed\n",
4130                             stoa(addr)));
4131         else
4132                 DPRINTF(4, ("findclosestinterface(%s) -> %s\n",
4133                             stoa(addr), stoa(&winner->sin)));
4134
4135         return winner;
4136 }
4137
4138
4139 /*
4140  * calc_addr_distance - calculate the distance between two addresses,
4141  *                      the absolute value of the difference between
4142  *                      the addresses numerically, stored as an address.
4143  */
4144 static void
4145 calc_addr_distance(
4146         sockaddr_u *            dist,
4147         const sockaddr_u *      a1,
4148         const sockaddr_u *      a2
4149         )
4150 {
4151         u_int32 a1val;
4152         u_int32 a2val;
4153         u_int32 v4dist;
4154         int     found_greater;
4155         int     a1_greater;
4156         int     i;
4157
4158         REQUIRE(AF(a1) == AF(a2));
4159
4160         ZERO_SOCK(dist);
4161         AF(dist) = AF(a1);
4162
4163         /* v4 can be done a bit simpler */
4164         if (IS_IPV4(a1)) {
4165                 a1val = SRCADR(a1);
4166                 a2val = SRCADR(a2);
4167                 v4dist = (a1val > a2val)
4168                              ? a1val - a2val
4169                              : a2val - a1val;
4170                 SET_ADDR4(dist, v4dist);
4171
4172                 return;
4173         }
4174
4175         found_greater = FALSE;
4176         a1_greater = FALSE;     /* suppress pot. uninit. warning */
4177         for (i = 0; i < (int)sizeof(NSRCADR6(a1)); i++) {
4178                 if (!found_greater &&
4179                     NSRCADR6(a1)[i] != NSRCADR6(a2)[i]) {
4180                         found_greater = TRUE;
4181                         a1_greater = (NSRCADR6(a1)[i] > NSRCADR6(a2)[i]);
4182                 }
4183                 if (!found_greater) {
4184                         NSRCADR6(dist)[i] = 0;
4185                 } else {
4186                         if (a1_greater)
4187                                 NSRCADR6(dist)[i] = NSRCADR6(a1)[i] -
4188                                                     NSRCADR6(a2)[i];
4189                         else
4190                                 NSRCADR6(dist)[i] = NSRCADR6(a2)[i] -
4191                                                     NSRCADR6(a1)[i];
4192                 }
4193         }
4194 }
4195
4196
4197 /*
4198  * cmp_addr_distance - compare two address distances, returning -1, 0,
4199  *                     1 to indicate their relationship.
4200  */
4201 static int
4202 cmp_addr_distance(
4203         const sockaddr_u *      d1,
4204         const sockaddr_u *      d2
4205         )
4206 {
4207         int     i;
4208
4209         REQUIRE(AF(d1) == AF(d2));
4210
4211         if (IS_IPV4(d1)) {
4212                 if (SRCADR(d1) < SRCADR(d2))
4213                         return -1;
4214                 else if (SRCADR(d1) == SRCADR(d2))
4215                         return 0;
4216                 else
4217                         return 1;
4218         }
4219
4220         for (i = 0; i < (int)sizeof(NSRCADR6(d1)); i++) {
4221                 if (NSRCADR6(d1)[i] < NSRCADR6(d2)[i])
4222                         return -1;
4223                 else if (NSRCADR6(d1)[i] > NSRCADR6(d2)[i])
4224                         return 1;
4225         }
4226
4227         return 0;
4228 }
4229
4230
4231
4232 /*
4233  * fetch an interface structure the matches the
4234  * address and has the given flags NOT set
4235  */
4236 endpt *
4237 getinterface(
4238         sockaddr_u *    addr,
4239         u_int32         flags
4240         )
4241 {
4242         endpt *iface;
4243
4244         iface = find_addr_in_list(addr);
4245
4246         if (iface != NULL && (iface->flags & flags))
4247                 iface = NULL;
4248
4249         return iface;
4250 }
4251
4252
4253 /*
4254  * findbcastinter - find broadcast interface corresponding to address
4255  */
4256 endpt *
4257 findbcastinter(
4258         sockaddr_u *addr
4259         )
4260 {
4261         endpt * iface;
4262
4263         iface = NULL;
4264 #if !defined(MPE) && (defined(SIOCGIFCONF) || defined(SYS_WINNT))
4265         DPRINTF(4, ("Finding broadcast/multicast interface for addr %s in list of addresses\n",
4266                     stoa(addr)));
4267
4268         iface = findlocalinterface(addr, INT_LOOPBACK | INT_WILDCARD,
4269                                    1);
4270         if (iface != NULL) {
4271                 DPRINTF(4, ("Easily found bcast-/mcast- interface index #%d %s\n",
4272                             iface->ifnum, iface->name));
4273                 return iface;
4274         }
4275
4276         /*
4277          * plan B - try to find something reasonable in our lists in
4278          * case kernel lookup doesn't help
4279          */
4280         for (iface = ep_list; iface != NULL; iface = iface->elink) {
4281                 if (iface->flags & INT_WILDCARD)
4282                         continue;
4283
4284                 /* Don't bother with ignored interfaces */
4285                 if (iface->ignore_packets)
4286                         continue;
4287
4288                 /*
4289                  * First look if this is the correct family
4290                  */
4291                 if(AF(&iface->sin) != AF(addr))
4292                         continue;
4293
4294                 /* Skip the loopback addresses */
4295                 if (iface->flags & INT_LOOPBACK)
4296                         continue;
4297
4298                 /*
4299                  * If we are looking to match a multicast address and
4300                  * this interface is one...
4301                  */
4302                 if (addr_ismulticast(addr)
4303                     && (iface->flags & INT_MULTICAST)) {
4304 #ifdef INCLUDE_IPV6_SUPPORT
4305                         /*
4306                          * ...it is the winner unless we're looking for
4307                          * an interface to use for link-local multicast
4308                          * and its address is not link-local.
4309                          */
4310                         if (IS_IPV6(addr)
4311                             && IN6_IS_ADDR_MC_LINKLOCAL(PSOCK_ADDR6(addr))
4312                             && !IN6_IS_ADDR_LINKLOCAL(PSOCK_ADDR6(&iface->sin)))
4313                                 continue;
4314 #endif
4315                         break;
4316                 }
4317
4318                 /*
4319                  * We match only those interfaces marked as
4320                  * broadcastable and either the explicit broadcast
4321                  * address or the network portion of the IP address.
4322                  * Sloppy.
4323                  */
4324                 if (IS_IPV4(addr)) {
4325                         if (SOCK_EQ(&iface->bcast, addr))
4326                                 break;
4327
4328                         if ((NSRCADR(&iface->sin) & NSRCADR(&iface->mask))
4329                             == (NSRCADR(addr)     & NSRCADR(&iface->mask)))
4330                                 break;
4331                 }
4332 #ifdef INCLUDE_IPV6_SUPPORT
4333                 else if (IS_IPV6(addr)) {
4334                         if (SOCK_EQ(&iface->bcast, addr))
4335                                 break;
4336
4337                         if (SOCK_EQ(netof(&iface->sin), netof(addr)))
4338                                 break;
4339                 }
4340 #endif
4341         }
4342 #endif /* SIOCGIFCONF */
4343         if (NULL == iface) {
4344                 DPRINTF(4, ("No bcast interface found for %s\n",
4345                             stoa(addr)));
4346                 iface = ANY_INTERFACE_CHOOSE(addr);
4347         } else {
4348                 DPRINTF(4, ("Found bcast-/mcast- interface index #%d %s\n",
4349                             iface->ifnum, iface->name));
4350         }
4351
4352         return iface;
4353 }
4354
4355
4356 /*
4357  * io_clr_stats - clear I/O module statistics
4358  */
4359 void
4360 io_clr_stats(void)
4361 {
4362         packets_dropped = 0;
4363         packets_ignored = 0;
4364         packets_received = 0;
4365         packets_sent = 0;
4366         packets_notsent = 0;
4367
4368         handler_calls = 0;
4369         handler_pkts = 0;
4370         io_timereset = current_time;
4371 }
4372
4373
4374 #ifdef REFCLOCK
4375 /*
4376  * io_addclock - add a reference clock to the list and arrange that we
4377  *                               get SIGIO interrupts from it.
4378  */
4379 int
4380 io_addclock(
4381         struct refclockio *rio
4382         )
4383 {
4384         BLOCKIO();
4385
4386         /*
4387          * Stuff the I/O structure in the list and mark the descriptor
4388          * in use.  There is a harmless (I hope) race condition here.
4389          */
4390         rio->active = TRUE;
4391
4392 # ifdef HAVE_SIGNALED_IO
4393         if (init_clock_sig(rio)) {
4394                 UNBLOCKIO();
4395                 return 0;
4396         }
4397 # elif defined(HAVE_IO_COMPLETION_PORT)
4398         if (!io_completion_port_add_clock_io(rio)) {
4399                 UNBLOCKIO();
4400                 return 0;
4401         }
4402 # endif
4403
4404         /*
4405          * enqueue
4406          */
4407         LINK_SLIST(refio, rio, next);
4408
4409         /*
4410          * register fd
4411          */
4412         add_fd_to_list(rio->fd, FD_TYPE_FILE);
4413
4414         UNBLOCKIO();
4415         return 1;
4416 }
4417
4418
4419 /*
4420  * io_closeclock - close the clock in the I/O structure given
4421  */
4422 void
4423 io_closeclock(
4424         struct refclockio *rio
4425         )
4426 {
4427         struct refclockio *unlinked;
4428
4429         BLOCKIO();
4430
4431         /*
4432          * Remove structure from the list
4433          */
4434         rio->active = FALSE;
4435         UNLINK_SLIST(unlinked, refio, rio, next, struct refclockio);
4436         if (NULL != unlinked) {
4437                 /* Close the descriptor. The order of operations is
4438                  * important here in case of async / overlapped IO:
4439                  * only after we have removed the clock from the
4440                  * IO completion port we can be sure no further
4441                  * input is queued. So...
4442                  *  - we first disable feeding to the queu by removing
4443                  *    the clock from the IO engine
4444                  *  - close the file (which brings down any IO on it)
4445                  *  - clear the buffer from results for this fd
4446                  */
4447 #           ifdef HAVE_IO_COMPLETION_PORT
4448                 io_completion_port_remove_clock_io(rio);
4449 #           endif
4450                 close_and_delete_fd_from_list(rio->fd);
4451                 purge_recv_buffers_for_fd(rio->fd);
4452                 rio->fd = -1;
4453         }
4454
4455         UNBLOCKIO();
4456 }
4457 #endif  /* REFCLOCK */
4458
4459
4460 /*
4461  * On NT a SOCKET is an unsigned int so we cannot possibly keep it in
4462  * an array. So we use one of the ISC_LIST functions to hold the
4463  * socket value and use that when we want to enumerate it.
4464  *
4465  * This routine is called by the forked intres child process to close
4466  * all open sockets.  On Windows there's no need as intres runs in
4467  * the same process as a thread.
4468  */
4469 #ifndef SYS_WINNT
4470 void
4471 kill_asyncio(
4472         int     startfd
4473         )
4474 {
4475         BLOCKIO();
4476
4477         /*
4478          * In the child process we do not maintain activefds and
4479          * maxactivefd.  Zeroing maxactivefd disables code which
4480          * maintains it in close_and_delete_fd_from_list().
4481          */
4482         maxactivefd = 0;
4483
4484         while (fd_list != NULL)
4485                 close_and_delete_fd_from_list(fd_list->fd);
4486
4487         UNBLOCKIO();
4488 }
4489 #endif  /* !SYS_WINNT */
4490
4491
4492 /*
4493  * Add and delete functions for the list of open sockets
4494  */
4495 static void
4496 add_fd_to_list(
4497         SOCKET fd,
4498         enum desc_type type
4499         )
4500 {
4501         vsock_t *lsock = emalloc(sizeof(*lsock));
4502
4503         lsock->fd = fd;
4504         lsock->type = type;
4505
4506         LINK_SLIST(fd_list, lsock, link);
4507         maintain_activefds(fd, 0);
4508 }
4509
4510
4511 static void
4512 close_and_delete_fd_from_list(
4513         SOCKET fd
4514         )
4515 {
4516         vsock_t *lsock;
4517
4518         UNLINK_EXPR_SLIST(lsock, fd_list, fd ==
4519             UNLINK_EXPR_SLIST_CURRENT()->fd, link, vsock_t);
4520
4521         if (NULL == lsock)
4522                 return;
4523
4524         switch (lsock->type) {
4525
4526         case FD_TYPE_SOCKET:
4527                 closesocket(lsock->fd);
4528                 break;
4529
4530         case FD_TYPE_FILE:
4531                 closeserial((int)lsock->fd);
4532                 break;
4533
4534         default:
4535                 msyslog(LOG_ERR,
4536                         "internal error - illegal descriptor type %d - EXITING",
4537                         (int)lsock->type);
4538                 exit(1);
4539         }
4540
4541         free(lsock);
4542         /*
4543          * remove from activefds
4544          */
4545         maintain_activefds(fd, 1);
4546 }
4547
4548
4549 static void
4550 add_addr_to_list(
4551         sockaddr_u *    addr,
4552         endpt *         ep
4553         )
4554 {
4555         remaddr_t *laddr;
4556
4557 #ifdef DEBUG
4558         if (find_addr_in_list(addr) == NULL) {
4559 #endif
4560                 /* not there yet - add to list */
4561                 laddr = emalloc(sizeof(*laddr));
4562                 laddr->addr = *addr;
4563                 laddr->ep = ep;
4564
4565                 LINK_SLIST(remoteaddr_list, laddr, link);
4566
4567                 DPRINTF(4, ("Added addr %s to list of addresses\n",
4568                             stoa(addr)));
4569 #ifdef DEBUG
4570         } else
4571                 DPRINTF(4, ("WARNING: Attempt to add duplicate addr %s to address list\n",
4572                             stoa(addr)));
4573 #endif
4574 }
4575
4576
4577 static void
4578 delete_addr_from_list(
4579         sockaddr_u *addr
4580         )
4581 {
4582         remaddr_t *unlinked;
4583
4584         UNLINK_EXPR_SLIST(unlinked, remoteaddr_list, SOCK_EQ(addr,
4585                 &(UNLINK_EXPR_SLIST_CURRENT()->addr)), link, remaddr_t);
4586
4587         if (unlinked != NULL) {
4588                 DPRINTF(4, ("Deleted addr %s from list of addresses\n",
4589                         stoa(addr)));
4590                 free(unlinked);
4591         }
4592 }
4593
4594
4595 static void
4596 delete_interface_from_list(
4597         endpt *iface
4598         )
4599 {
4600         remaddr_t *unlinked;
4601
4602         for (;;) {
4603                 UNLINK_EXPR_SLIST(unlinked, remoteaddr_list, iface ==
4604                     UNLINK_EXPR_SLIST_CURRENT()->ep, link,
4605                     remaddr_t);
4606
4607                 if (unlinked == NULL)
4608                         break;
4609                 DPRINTF(4, ("Deleted addr %s for interface #%d %s from list of addresses\n",
4610                             stoa(&unlinked->addr), iface->ifnum,
4611                             iface->name));
4612                 free(unlinked);
4613         }
4614 }
4615
4616
4617 static struct interface *
4618 find_addr_in_list(
4619         sockaddr_u *addr
4620         )
4621 {
4622         remaddr_t *entry;
4623
4624         DPRINTF(4, ("Searching for addr %s in list of addresses - ",
4625                     stoa(addr)));
4626
4627         for (entry = remoteaddr_list;
4628              entry != NULL;
4629              entry = entry->link)
4630                 if (SOCK_EQ(&entry->addr, addr)) {
4631                         DPRINTF(4, ("FOUND\n"));
4632                         return entry->ep;
4633                 }
4634
4635         DPRINTF(4, ("NOT FOUND\n"));
4636         return NULL;
4637 }
4638
4639
4640 /*
4641  * Find the given address with the all given flags set in the list
4642  */
4643 static endpt *
4644 find_flagged_addr_in_list(
4645         sockaddr_u *    addr,
4646         u_int32         flags
4647         )
4648 {
4649         remaddr_t *entry;
4650
4651         DPRINTF(4, ("Finding addr %s with flags %d in list: ",
4652                     stoa(addr), flags));
4653
4654         for (entry = remoteaddr_list;
4655              entry != NULL;
4656              entry = entry->link)
4657
4658                 if (SOCK_EQ(&entry->addr, addr)
4659                     && (entry->ep->flags & flags) == flags) {
4660
4661                         DPRINTF(4, ("FOUND\n"));
4662                         return entry->ep;
4663                 }
4664
4665         DPRINTF(4, ("NOT FOUND\n"));
4666         return NULL;
4667 }
4668
4669
4670 const char *
4671 localaddrtoa(
4672         endpt *la
4673         )
4674 {
4675         return (NULL == la)
4676                    ? "<null>"
4677                    : stoa(&la->sin);
4678 }
4679
4680
4681 #ifdef HAS_ROUTING_SOCKET
4682 # ifndef UPDATE_GRACE
4683 #  define UPDATE_GRACE  2       /* wait UPDATE_GRACE seconds before scanning */
4684 # endif
4685
4686 static void
4687 process_routing_msgs(struct asyncio_reader *reader)
4688 {
4689         char buffer[5120];
4690         int cnt, msg_type;
4691 #ifdef HAVE_RTNETLINK
4692         struct nlmsghdr *nh;
4693 #else
4694         struct rt_msghdr rtm;
4695         char *p;
4696 #endif
4697
4698         if (disable_dynamic_updates) {
4699                 /*
4700                  * discard ourselves if we are not needed any more
4701                  * usually happens when running unprivileged
4702                  */
4703                 remove_asyncio_reader(reader);
4704                 delete_asyncio_reader(reader);
4705                 return;
4706         }
4707
4708         cnt = read(reader->fd, buffer, sizeof(buffer));
4709
4710         if (cnt < 0) {
4711                 if (errno == ENOBUFS) {
4712                         msyslog(LOG_ERR,
4713                                 "routing socket reports: %m");
4714                 } else {
4715                         msyslog(LOG_ERR,
4716                                 "routing socket reports: %m - disabling");
4717                         remove_asyncio_reader(reader);
4718                         delete_asyncio_reader(reader);
4719                 }
4720                 return;
4721         }
4722
4723         /*
4724          * process routing message
4725          */
4726 #ifdef HAVE_RTNETLINK
4727         for (nh = UA_PTR(struct nlmsghdr, buffer);
4728              NLMSG_OK(nh, cnt);
4729              nh = NLMSG_NEXT(nh, cnt)) {
4730                 msg_type = nh->nlmsg_type;
4731 #else
4732         for (p = buffer;
4733              (p + sizeof(struct rt_msghdr)) <= (buffer + cnt);
4734              p += rtm.rtm_msglen) {
4735                 memcpy(&rtm, p, sizeof(rtm));
4736                 if (rtm.rtm_version != RTM_VERSION) {
4737                         msyslog(LOG_ERR,
4738                                 "version mismatch (got %d - expected %d) on routing socket - disabling",
4739                                 rtm.rtm_version, RTM_VERSION);
4740
4741                         remove_asyncio_reader(reader);
4742                         delete_asyncio_reader(reader);
4743                         return;
4744                 }
4745                 msg_type = rtm.rtm_type;
4746 #endif
4747                 switch (msg_type) {
4748 #ifdef RTM_NEWADDR
4749                 case RTM_NEWADDR:
4750 #endif
4751 #ifdef RTM_DELADDR
4752                 case RTM_DELADDR:
4753 #endif
4754 #ifdef RTM_ADD
4755                 case RTM_ADD:
4756 #endif
4757 #ifdef RTM_DELETE
4758                 case RTM_DELETE:
4759 #endif
4760 #ifdef RTM_REDIRECT
4761                 case RTM_REDIRECT:
4762 #endif
4763 #ifdef RTM_CHANGE
4764                 case RTM_CHANGE:
4765 #endif
4766 #ifdef RTM_LOSING
4767                 case RTM_LOSING:
4768 #endif
4769 #ifdef RTM_IFINFO
4770                 case RTM_IFINFO:
4771 #endif
4772 #ifdef RTM_IFANNOUNCE
4773                 case RTM_IFANNOUNCE:
4774 #endif
4775 #ifdef RTM_NEWLINK
4776                 case RTM_NEWLINK:
4777 #endif
4778 #ifdef RTM_DELLINK
4779                 case RTM_DELLINK:
4780 #endif
4781 #ifdef RTM_NEWROUTE
4782                 case RTM_NEWROUTE:
4783 #endif
4784 #ifdef RTM_DELROUTE
4785                 case RTM_DELROUTE:
4786 #endif
4787                         /*
4788                          * we are keen on new and deleted addresses and
4789                          * if an interface goes up and down or routing
4790                          * changes
4791                          */
4792                         DPRINTF(3, ("routing message op = %d: scheduling interface update\n",
4793                                     msg_type));
4794                         timer_interfacetimeout(current_time + UPDATE_GRACE);
4795                         break;
4796 #ifdef HAVE_RTNETLINK
4797                 case NLMSG_DONE:
4798                         /* end of multipart message */
4799                         return;
4800 #endif
4801                 default:
4802                         /*
4803                          * the rest doesn't bother us.
4804                          */
4805                         DPRINTF(4, ("routing message op = %d: ignored\n",
4806                                     msg_type));
4807                         break;
4808                 }
4809         }
4810 }
4811
4812 /*
4813  * set up routing notifications
4814  */
4815 static void
4816 init_async_notifications()
4817 {
4818         struct asyncio_reader *reader;
4819 #ifdef HAVE_RTNETLINK
4820         int fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
4821         struct sockaddr_nl sa;
4822 #else
4823         int fd = socket(PF_ROUTE, SOCK_RAW, 0);
4824 #endif
4825         if (fd < 0) {
4826                 msyslog(LOG_ERR,
4827                         "unable to open routing socket (%m) - using polled interface update");
4828                 return;
4829         }
4830
4831         fd = move_fd(fd);
4832 #ifdef HAVE_RTNETLINK
4833         ZERO(sa);
4834         sa.nl_family = PF_NETLINK;
4835         sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR
4836                        | RTMGRP_IPV6_IFADDR | RTMGRP_IPV4_ROUTE
4837                        | RTMGRP_IPV4_MROUTE | RTMGRP_IPV6_ROUTE
4838                        | RTMGRP_IPV6_MROUTE;
4839         if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
4840                 msyslog(LOG_ERR,
4841                         "bind failed on routing socket (%m) - using polled interface update");
4842                 return;
4843         }
4844 #endif
4845         make_socket_nonblocking(fd);
4846 #if defined(HAVE_SIGNALED_IO)
4847         init_socket_sig(fd);
4848 #endif /* HAVE_SIGNALED_IO */
4849
4850         reader = new_asyncio_reader();
4851
4852         reader->fd = fd;
4853         reader->receiver = process_routing_msgs;
4854
4855         add_asyncio_reader(reader, FD_TYPE_SOCKET);
4856         msyslog(LOG_INFO,
4857                 "Listening on routing socket on fd #%d for interface updates",
4858                 fd);
4859 }
4860 #else
4861 /* HAS_ROUTING_SOCKET not defined */
4862 static void
4863 init_async_notifications(void)
4864 {
4865 }
4866 #endif
4867