usr.sbin/inetd/inetd.c

   1 /*
   2  * Copyright (c) 1983, 1991, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)from: inetd.c       8.4 (Berkeley) 4/13/94";
  39 #endif
  40 #endif /* not lint */
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 /*
  46  * Inetd - Internet super-server
  47  *
  48  * This program invokes all internet services as needed.  Connection-oriented
  49  * services are invoked each time a connection is made, by creating a process.
  50  * This process is passed the connection as file descriptor 0 and is expected
  51  * to do a getpeername to find out the source host and port.
  52  *
  53  * Datagram oriented services are invoked when a datagram
  54  * arrives; a process is created and passed a pending message
  55  * on file descriptor 0.  Datagram servers may either connect
  56  * to their peer, freeing up the original socket for inetd
  57  * to receive further messages on, or ``take over the socket'',
  58  * processing all arriving datagrams and, eventually, timing
  59  * out.  The first type of server is said to be ``multi-threaded'';
  60  * the second type of server ``single-threaded''.
  61  *
  62  * Inetd uses a configuration file which is read at startup
  63  * and, possibly, at some later time in response to a hangup signal.
  64  * The configuration file is ``free format'' with fields given in the
  65  * order shown below.  Continuation lines for an entry must begin with
  66  * a space or tab.  All fields must be present in each entry.
  67  *
  68  *      service name                    must be in /etc/services
  69  *                                      or name a tcpmux service
  70  *                                      or specify a unix domain socket
  71  *      socket type                     stream/dgram/raw/rdm/seqpacket
  72  *      protocol                        tcp[4][6], udp[4][6], unix
  73  *      wait/nowait                     single-threaded/multi-threaded
  74  *      user[:group][/login-class]      user/group/login-class to run daemon as
  75  *      server program                  full path name
  76  *      server program arguments        maximum of MAXARGS (20)
  77  *
  78  * TCP services without official port numbers are handled with the
  79  * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
  80  * requests. When a connection is made from a foreign host, the service
  81  * requested is passed to tcpmux, which looks it up in the servtab list
  82  * and returns the proper entry for the service. Tcpmux returns a
  83  * negative reply if the service doesn't exist, otherwise the invoked
  84  * server is expected to return the positive reply if the service type in
  85  * inetd.conf file has the prefix "tcpmux/". If the service type has the
  86  * prefix "tcpmux/+", tcpmux will return the positive reply for the
  87  * process; this is for compatibility with older server code, and also
  88  * allows you to invoke programs that use stdin/stdout without putting any
  89  * special server code in them. Services that use tcpmux are "nowait"
  90  * because they do not have a well-known port and hence cannot listen
  91  * for new requests.
  92  *
  93  * For RPC services
  94  *      service name/version            must be in /etc/rpc
  95  *      socket type                     stream/dgram/raw/rdm/seqpacket
  96  *      protocol                        rpc/tcp[4][6], rpc/udp[4][6]
  97  *      wait/nowait                     single-threaded/multi-threaded
  98  *      user[:group][/login-class]      user/group/login-class to run daemon as
  99  *      server program                  full path name
 100  *      server program arguments        maximum of MAXARGS
 101  *
 102  * Comment lines are indicated by a `#' in column 1.
 103  *
 104  * #ifdef IPSEC
 105  * Comment lines that start with "#@" denote IPsec policy string, as described
 106  * in ipsec_set_policy(3).  This will affect all the following items in
 107  * inetd.conf(8).  To reset the policy, just use "#@" line.  By default,
 108  * there's no IPsec policy.
 109  * #endif
 110  */
 111 #include <sys/param.h>
 112 #include <sys/ioctl.h>
 113 #include <sys/mman.h>
 114 #include <sys/wait.h>
 115 #include <sys/time.h>
 116 #include <sys/resource.h>
 117 #include <sys/stat.h>
 118 #include <sys/un.h>
 119
 120 #include <netinet/in.h>
 121 #include <netinet/tcp.h>
 122 #include <arpa/inet.h>
 123 #include <rpc/rpc.h>
 124 #include <rpc/pmap_clnt.h>
 125
 126 #include <ctype.h>
 127 #include <errno.h>
 128 #include <err.h>
 129 #include <fcntl.h>
 130 #include <grp.h>
 131 #include <libutil.h>
 132 #include <limits.h>
 133 #include <netdb.h>
 134 #include <pwd.h>
 135 #include <signal.h>
 136 #include <stdio.h>
 137 #include <stdlib.h>
 138 #include <string.h>
 139 #include <sysexits.h>
 140 #include <syslog.h>
 141 #ifdef LIBWRAP
 142 #include <tcpd.h>
 143 #endif
 144 #include <unistd.h>
 145
 146 #include "inetd.h"
 147 #include "pathnames.h"
 148
 149 #ifdef IPSEC
 150 #include <netipsec/ipsec.h>
 151 #ifndef IPSEC_POLICY_IPSEC      /* no ipsec support on old ipsec */
 152 #undef IPSEC
 153 #endif
 154 #endif
 155
 156 #ifndef LIBWRAP_ALLOW_FACILITY
 157 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
 158 #endif
 159 #ifndef LIBWRAP_ALLOW_SEVERITY
 160 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
 161 #endif
 162 #ifndef LIBWRAP_DENY_FACILITY
 163 # define LIBWRAP_DENY_FACILITY LOG_AUTH
 164 #endif
 165 #ifndef LIBWRAP_DENY_SEVERITY
 166 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
 167 #endif
 168
 169 #define ISWRAP(sep)     \
 170            ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
 171         && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
 172         && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
 173             || (sep)->se_socktype == SOCK_DGRAM))
 174
 175 #ifdef LOGIN_CAP
 176 #include <login_cap.h>
 177
 178 /* see init.c */
 179 #define RESOURCE_RC "daemon"
 180
 181 #endif
 182
 183 #ifndef MAXCHILD
 184 #define MAXCHILD        -1              /* maximum number of this service
 185                                            < 0 = no limit */
 186 #endif
 187
 188 #ifndef MAXCPM
 189 #define MAXCPM          -1              /* rate limit invocations from a
 190                                            single remote address,
 191                                            < 0 = no limit */
 192 #endif
 193
 194 #ifndef MAXPERIP
 195 #define MAXPERIP        -1              /* maximum number of this service
 196                                            from a single remote address,
 197                                            < 0 = no limit */
 198 #endif
 199
 200 #ifndef TOOMANY
 201 #define TOOMANY         256             /* don't start more than TOOMANY */
 202 #endif
 203 #define CNT_INTVL       60              /* servers in CNT_INTVL sec. */
 204 #define RETRYTIME       (60*10)         /* retry after bind or server fail */
 205 #define MAX_MAXCHLD     32767           /* max allowable max children */
 206
 207 #define SIGBLOCK        (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
 208
 209 #define satosin(sa)     ((struct sockaddr_in *)(void *)sa)
 210 #define csatosin(sa)    ((const struct sockaddr_in *)(const void *)sa)
 211 #ifdef INET6
 212 #define satosin6(sa)    ((struct sockaddr_in6 *)(void *)sa)
 213 #define csatosin6(sa)   ((const struct sockaddr_in6 *)(const void *)sa)
 214 #endif
 215 static void     close_sep(struct servtab *);
 216 static void     flag_signal(int);
 217 static void     flag_config(int);
 218 static void     config(void);
 219 static int      cpmip(const struct servtab *, int);
 220 static void     endconfig(void);
 221 static struct servtab *enter(struct servtab *);
 222 static void     freeconfig(struct servtab *);
 223 static struct servtab *getconfigent(void);
 224 static int      matchservent(const char *, const char *, const char *);
 225 static char     *nextline(FILE *);
 226 static void     addchild(struct servtab *, int);
 227 static void     flag_reapchild(int);
 228 static void     reapchild(void);
 229 static void     enable(struct servtab *);
 230 static void     disable(struct servtab *);
 231 static void     flag_retry(int);
 232 static void     retry(void);
 233 static int      setconfig(void);
 234 static void     setup(struct servtab *);
 235 #ifdef IPSEC
 236 static void     ipsecsetup(struct servtab *);
 237 #endif
 238 static void     unregisterrpc(register struct servtab *sep);
 239 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
 240 static int      room_conn(struct servtab *sep, struct conninfo *conn);
 241 static void     addchild_conn(struct conninfo *conn, pid_t pid);
 242 static void     reapchild_conn(pid_t pid);
 243 static void     free_conn(struct conninfo *conn);
 244 static void     resize_conn(struct servtab *sep, int maxperip);
 245 static void     free_connlist(struct servtab *sep);
 246 static void     free_proc(struct procinfo *);
 247 static struct procinfo *search_proc(pid_t pid, int add);
 248 static int      hashval(char *p, int len);
 249 static char     *skip(char **);
 250 static char     *sskip(char **);
 251 static char     *newstr(const char *);
 252 static void     print_service(const char *, const struct servtab *);
 253
 254 /* tcpd.h */
 255 int     allow_severity;
 256 int     deny_severity;
 257
 258 static int      wrap_ex = 0;
 259 static int      wrap_bi = 0;
 260 int     debug = 0;
 261 static int      dolog = 0;
 262 static int      maxsock;                /* highest-numbered descriptor */
 263 static fd_set   allsock;
 264 static int      options;
 265 static int      timingout;
 266 static int      toomany = TOOMANY;
 267 static int      maxchild = MAXCHILD;
 268 static int      maxcpm = MAXCPM;
 269 static int      maxperip = MAXPERIP;
 270 static struct   servent *sp;
 271 static struct   rpcent *rpc;
 272 static char     *hostname = NULL;
 273 static struct   sockaddr_in *bind_sa4;
 274 static int      v4bind_ok = 0;
 275 #ifdef INET6
 276 static struct   sockaddr_in6 *bind_sa6;
 277 static int      v6bind_ok = 0;
 278 #endif
 279 static int      signalpipe[2];
 280 #ifdef SANITY_CHECK
 281 static int      nsock;
 282 #endif
 283 static uid_t    euid;
 284 static gid_t    egid;
 285 static mode_t   mask;
 286
 287 struct servtab *servtab;
 288
 289 static const char       *CONFIG = _PATH_INETDCONF;
 290 static const char       *pid_file = _PATH_INETDPID;
 291 static struct pidfh     *pfh = NULL;
 292
 293 static struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
 294
 295 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
 296
 297 static int
 298 getvalue(const char *arg, int *value, const char *whine)
 299 {
 300         int  tmp;
 301         char *p;
 302
 303         tmp = strtol(arg, &p, 0);
 304         if (tmp < 0 || *p) {
 305                 syslog(LOG_ERR, whine, arg);
 306                 return 1;                       /* failure */
 307         }
 308         *value = tmp;
 309         return 0;                               /* success */
 310 }
 311
 312 #ifdef LIBWRAP
 313 static sa_family_t
 314 whichaf(struct request_info *req)
 315 {
 316         struct sockaddr *sa;
 317
 318         sa = (struct sockaddr *)req->client->sin;
 319         if (sa == NULL)
 320                 return AF_UNSPEC;
 321 #ifdef INET6
 322         if (sa->sa_family == AF_INET6 &&
 323             IN6_IS_ADDR_V4MAPPED(&satosin6(sa)->sin6_addr))
 324                 return AF_INET;
 325 #endif
 326         return sa->sa_family;
 327 }
 328 #endif
 329
 330 int
 331 main(int argc, char **argv)
 332 {
 333         struct servtab *sep;
 334         struct passwd *pwd;
 335         struct group *grp;
 336         struct sigaction sa, saalrm, sachld, sahup, sapipe;
 337         int ch, dofork;
 338         pid_t pid;
 339         char buf[50];
 340 #ifdef LOGIN_CAP
 341         login_cap_t *lc = NULL;
 342 #endif
 343 #ifdef LIBWRAP
 344         struct request_info req;
 345         int denied;
 346         char *service = NULL;
 347 #endif
 348         struct sockaddr_storage peer;
 349         int i;
 350         struct addrinfo hints, *res;
 351         const char *servname;
 352         int error;
 353         struct conninfo *conn;
 354
 355         openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
 356
 357         while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
 358                 switch(ch) {
 359                 case 'd':
 360                         debug = 1;
 361                         options |= SO_DEBUG;
 362                         break;
 363                 case 'l':
 364                         dolog = 1;
 365                         break;
 366                 case 'R':
 367                         getvalue(optarg, &toomany,
 368                                 "-R %s: bad value for service invocation rate");
 369                         break;
 370                 case 'c':
 371                         getvalue(optarg, &maxchild,
 372                                 "-c %s: bad value for maximum children");
 373                         break;
 374                 case 'C':
 375                         getvalue(optarg, &maxcpm,
 376                                 "-C %s: bad value for maximum children/minute");
 377                         break;
 378                 case 'a':
 379                         hostname = optarg;
 380                         break;
 381                 case 'p':
 382                         pid_file = optarg;
 383                         break;
 384                 case 's':
 385                         getvalue(optarg, &maxperip,
 386                                 "-s %s: bad value for maximum children per source address");
 387                         break;
 388                 case 'w':
 389                         wrap_ex++;
 390                         break;
 391                 case 'W':
 392                         wrap_bi++;
 393                         break;
 394                 case '?':
 395                 default:
 396                         syslog(LOG_ERR,
 397                                 "usage: inetd [-dlwW] [-a address] [-R rate]"
 398                                 " [-c maximum] [-C rate]"
 399                                 " [-p pidfile] [conf-file]");
 400                         exit(EX_USAGE);
 401                 }
 402         /*
 403          * Initialize Bind Addrs.
 404          *   When hostname is NULL, wild card bind addrs are obtained from
 405          *   getaddrinfo(). But getaddrinfo() requires at least one of
 406          *   hostname or servname is non NULL.
 407          *   So when hostname is NULL, set dummy value to servname.
 408          *   Since getaddrinfo() doesn't accept numeric servname, and
 409          *   we doesn't use ai_socktype of struct addrinfo returned
 410          *   from getaddrinfo(), we set dummy value to ai_socktype.
 411          */
 412         servname = (hostname == NULL) ? "0" /* dummy */ : NULL;
 413
 414         bzero(&hints, sizeof(struct addrinfo));
 415         hints.ai_flags = AI_PASSIVE;
 416         hints.ai_family = AF_UNSPEC;
 417         hints.ai_socktype = SOCK_STREAM;        /* dummy */
 418         error = getaddrinfo(hostname, servname, &hints, &res);
 419         if (error != 0) {
 420                 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
 421                 if (error == EAI_SYSTEM)
 422                         syslog(LOG_ERR, "%s", strerror(errno));
 423                 exit(EX_USAGE);
 424         }
 425         do {
 426                 if (res->ai_addr == NULL) {
 427                         syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
 428                         exit(EX_USAGE);
 429                 }
 430                 switch (res->ai_addr->sa_family) {
 431                 case AF_INET:
 432                         if (v4bind_ok)
 433                                 continue;
 434                         bind_sa4 = satosin(res->ai_addr);
 435                         /* init port num in case servname is dummy */
 436                         bind_sa4->sin_port = 0;
 437                         v4bind_ok = 1;
 438                         continue;
 439 #ifdef INET6
 440                 case AF_INET6:
 441                         if (v6bind_ok)
 442                                 continue;
 443                         bind_sa6 = satosin6(res->ai_addr);
 444                         /* init port num in case servname is dummy */
 445                         bind_sa6->sin6_port = 0;
 446                         v6bind_ok = 1;
 447                         continue;
 448 #endif
 449                 }
 450                 if (v4bind_ok
 451 #ifdef INET6
 452                     && v6bind_ok
 453 #endif
 454                     )
 455                         break;
 456         } while ((res = res->ai_next) != NULL);
 457         if (!v4bind_ok
 458 #ifdef INET6
 459             && !v6bind_ok
 460 #endif
 461             ) {
 462                 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
 463                 exit(EX_USAGE);
 464         }
 465
 466         euid = geteuid();
 467         egid = getegid();
 468         umask(mask = umask(0777));
 469
 470         argc -= optind;
 471         argv += optind;
 472
 473         if (argc > 0)
 474                 CONFIG = argv[0];
 475         if (access(CONFIG, R_OK) < 0)
 476                 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG);
 477         if (debug == 0) {
 478                 pid_t otherpid;
 479
 480                 pfh = pidfile_open(pid_file, 0600, &otherpid);
 481                 if (pfh == NULL) {
 482                         if (errno == EEXIST) {
 483                                 syslog(LOG_ERR, "%s already running, pid: %d",
 484                                     getprogname(), otherpid);
 485                                 exit(EX_OSERR);
 486                         }
 487                         syslog(LOG_WARNING, "pidfile_open() failed: %m");
 488                 }
 489
 490                 if (daemon(0, 0) < 0) {
 491                         syslog(LOG_WARNING, "daemon(0,0) failed: %m");
 492                 }
 493                 /* From now on we don't want syslog messages going to stderr. */
 494                 closelog();
 495                 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
 496                 /*
 497                  * In case somebody has started inetd manually, we need to
 498                  * clear the logname, so that old servers run as root do not
 499                  * get the user's logname..
 500                  */
 501                 if (setlogin("") < 0) {
 502                         syslog(LOG_WARNING, "cannot clear logname: %m");
 503                         /* no big deal if it fails.. */
 504                 }
 505                 if (pfh != NULL && pidfile_write(pfh) == -1) {
 506                         syslog(LOG_WARNING, "pidfile_write(): %m");
 507                 }
 508         }
 509
 510         if (madvise(NULL, 0, MADV_PROTECT) != 0)
 511                 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno));
 512
 513         for (i = 0; i < PERIPSIZE; ++i)
 514                 LIST_INIT(&proctable[i]);
 515
 516         if (v4bind_ok) {
 517                 udpconf = getnetconfigent("udp");
 518                 tcpconf = getnetconfigent("tcp");
 519                 if (udpconf == NULL || tcpconf == NULL) {
 520                         syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp");
 521                         exit(EX_USAGE);
 522                 }
 523         }
 524 #ifdef INET6
 525         if (v6bind_ok) {
 526                 udp6conf = getnetconfigent("udp6");
 527                 tcp6conf = getnetconfigent("tcp6");
 528                 if (udp6conf == NULL || tcp6conf == NULL) {
 529                         syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6");
 530                         exit(EX_USAGE);
 531                 }
 532         }
 533 #endif
 534
 535         sa.sa_flags = 0;
 536         sigemptyset(&sa.sa_mask);
 537         sigaddset(&sa.sa_mask, SIGALRM);
 538         sigaddset(&sa.sa_mask, SIGCHLD);
 539         sigaddset(&sa.sa_mask, SIGHUP);
 540         sa.sa_handler = flag_retry;
 541         sigaction(SIGALRM, &sa, &saalrm);
 542         config();
 543         sa.sa_handler = flag_config;
 544         sigaction(SIGHUP, &sa, &sahup);
 545         sa.sa_handler = flag_reapchild;
 546         sigaction(SIGCHLD, &sa, &sachld);
 547         sa.sa_handler = SIG_IGN;
 548         sigaction(SIGPIPE, &sa, &sapipe);
 549
 550         {
 551                 /* space for daemons to overwrite environment for ps */
 552 #define DUMMYSIZE       100
 553                 char dummy[DUMMYSIZE];
 554
 555                 (void)memset(dummy, 'x', DUMMYSIZE - 1);
 556                 dummy[DUMMYSIZE - 1] = '\0';
 557                 (void)setenv("inetd_dummy", dummy, 1);
 558         }
 559
 560         if (pipe2(signalpipe, O_CLOEXEC) != 0) {
 561                 syslog(LOG_ERR, "pipe: %m");
 562                 exit(EX_OSERR);
 563         }
 564         FD_SET(signalpipe[0], &allsock);
 565 #ifdef SANITY_CHECK
 566         nsock++;
 567 #endif
 568         if (signalpipe[0] > maxsock)
 569             maxsock = signalpipe[0];
 570         if (signalpipe[1] > maxsock)
 571             maxsock = signalpipe[1];
 572
 573         for (;;) {
 574             int n, ctrl;
 575             fd_set readable;
 576
 577 #ifdef SANITY_CHECK
 578             if (nsock == 0) {
 579                 syslog(LOG_ERR, "%s: nsock=0", __func__);
 580                 exit(EX_SOFTWARE);
 581             }
 582 #endif
 583             readable = allsock;
 584             if ((n = select(maxsock + 1, &readable, (fd_set *)0,
 585                 (fd_set *)0, (struct timeval *)0)) <= 0) {
 586                     if (n < 0 && errno != EINTR) {
 587                         syslog(LOG_WARNING, "select: %m");
 588                         sleep(1);
 589                     }
 590                     continue;
 591             }
 592             /* handle any queued signal flags */
 593             if (FD_ISSET(signalpipe[0], &readable)) {
 594                 int nsig;
 595                 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
 596                     syslog(LOG_ERR, "ioctl: %m");
 597                     exit(EX_OSERR);
 598                 }
 599                 while (--nsig >= 0) {
 600                     char c;
 601                     if (read(signalpipe[0], &c, 1) != 1) {
 602                         syslog(LOG_ERR, "read: %m");
 603                         exit(EX_OSERR);
 604                     }
 605                     if (debug)
 606                         warnx("handling signal flag %c", c);
 607                     switch(c) {
 608                     case 'A': /* sigalrm */
 609                         retry();
 610                         break;
 611                     case 'C': /* sigchld */
 612                         reapchild();
 613                         break;
 614                     case 'H': /* sighup */
 615                         config();
 616                         break;
 617                     }
 618                 }
 619             }
 620             for (sep = servtab; n && sep; sep = sep->se_next)
 621                 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
 622                     n--;
 623                     if (debug)
 624                             warnx("someone wants %s", sep->se_service);
 625                     dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
 626                     conn = NULL;
 627                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
 628                             i = 1;
 629                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 630                                     syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
 631                             ctrl = accept(sep->se_fd, (struct sockaddr *)0,
 632                                 (socklen_t *)0);
 633                             if (debug)
 634                                     warnx("accept, ctrl %d", ctrl);
 635                             if (ctrl < 0) {
 636                                     if (errno != EINTR)
 637                                             syslog(LOG_WARNING,
 638                                                 "accept (for %s): %m",
 639                                                 sep->se_service);
 640                                       if (sep->se_accept &&
 641                                           sep->se_socktype == SOCK_STREAM)
 642                                               close(ctrl);
 643                                     continue;
 644                             }
 645                             i = 0;
 646                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 647                                     syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
 648                             if (ioctl(ctrl, FIONBIO, &i) < 0)
 649                                     syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
 650                             if (cpmip(sep, ctrl) < 0) {
 651                                 close(ctrl);
 652                                 continue;
 653                             }
 654                             if (dofork &&
 655                                 (conn = search_conn(sep, ctrl)) != NULL &&
 656                                 !room_conn(sep, conn)) {
 657                                 close(ctrl);
 658                                 continue;
 659                             }
 660                     } else
 661                             ctrl = sep->se_fd;
 662                     if (dolog && !ISWRAP(sep)) {
 663                             char pname[NI_MAXHOST] = "unknown";
 664                             socklen_t sl;
 665                             sl = sizeof(peer);
 666                             if (getpeername(ctrl, (struct sockaddr *)
 667                                             &peer, &sl)) {
 668                                     sl = sizeof(peer);
 669                                     if (recvfrom(ctrl, buf, sizeof(buf),
 670                                         MSG_PEEK,
 671                                         (struct sockaddr *)&peer,
 672                                         &sl) >= 0) {
 673                                       getnameinfo((struct sockaddr *)&peer,
 674                                                   peer.ss_len,
 675                                                   pname, sizeof(pname),
 676                                                   NULL, 0, NI_NUMERICHOST);
 677                                     }
 678                             } else {
 679                                     getnameinfo((struct sockaddr *)&peer,
 680                                                 peer.ss_len,
 681                                                 pname, sizeof(pname),
 682                                                 NULL, 0, NI_NUMERICHOST);
 683                             }
 684                             syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
 685                     }
 686                     (void) sigblock(SIGBLOCK);
 687                     pid = 0;
 688                     /*
 689                      * Fork for all external services, builtins which need to
 690                      * fork and anything we're wrapping (as wrapping might
 691                      * block or use hosts_options(5) twist).
 692                      */
 693                     if (dofork) {
 694                             if (sep->se_count++ == 0)
 695                                 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time);
 696                             else if (toomany > 0 && sep->se_count >= toomany) {
 697                                 struct timespec now;
 698
 699                                 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 700                                 if (now.tv_sec - sep->se_time.tv_sec >
 701                                     CNT_INTVL) {
 702                                         sep->se_time = now;
 703                                         sep->se_count = 1;
 704                                 } else {
 705                                         syslog(LOG_ERR,
 706                         "%s/%s server failing (looping), service terminated",
 707                                             sep->se_service, sep->se_proto);
 708                                         if (sep->se_accept &&
 709                                             sep->se_socktype == SOCK_STREAM)
 710                                                 close(ctrl);
 711                                         close_sep(sep);
 712                                         free_conn(conn);
 713                                         sigsetmask(0L);
 714                                         if (!timingout) {
 715                                                 timingout = 1;
 716                                                 alarm(RETRYTIME);
 717                                         }
 718                                         continue;
 719                                 }
 720                             }
 721                             pid = fork();
 722                     }
 723                     if (pid < 0) {
 724                             syslog(LOG_ERR, "fork: %m");
 725                             if (sep->se_accept &&
 726                                 sep->se_socktype == SOCK_STREAM)
 727                                     close(ctrl);
 728                             free_conn(conn);
 729                             sigsetmask(0L);
 730                             sleep(1);
 731                             continue;
 732                     }
 733                     if (pid) {
 734                         addchild_conn(conn, pid);
 735                         addchild(sep, pid);
 736                     }
 737                     sigsetmask(0L);
 738                     if (pid == 0) {
 739                             pidfile_close(pfh);
 740                             if (dofork) {
 741                                 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
 742                                 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
 743                                 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
 744                                 /* SIGPIPE reset before exec */
 745                             }
 746                             /*
 747                              * Call tcpmux to find the real service to exec.
 748                              */
 749                             if (sep->se_bi &&
 750                                 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
 751                                     sep = tcpmux(ctrl);
 752                                     if (sep == NULL) {
 753                                             close(ctrl);
 754                                             _exit(0);
 755                                     }
 756                             }
 757 #ifdef LIBWRAP
 758                             if (ISWRAP(sep)) {
 759                                 inetd_setproctitle("wrapping", ctrl);
 760                                 service = sep->se_server_name ?
 761                                     sep->se_server_name : sep->se_service;
 762                                 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0);
 763                                 fromhost(&req);
 764                                 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
 765                                 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
 766                                 denied = !hosts_access(&req);
 767                                 if (denied) {
 768                                     syslog(deny_severity,
 769                                         "refused connection from %.500s, service %s (%s%s)",
 770                                         eval_client(&req), service, sep->se_proto,
 771                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 772                                     if (sep->se_socktype != SOCK_STREAM)
 773                                         recv(ctrl, buf, sizeof (buf), 0);
 774                                     if (dofork) {
 775                                         sleep(1);
 776                                         _exit(0);
 777                                     }
 778                                 }
 779                                 if (dolog) {
 780                                     syslog(allow_severity,
 781                                         "connection from %.500s, service %s (%s%s)",
 782                                         eval_client(&req), service, sep->se_proto,
 783                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 784                                 }
 785                             }
 786 #endif
 787                             if (sep->se_bi) {
 788                                 (*sep->se_bi->bi_fn)(ctrl, sep);
 789                             } else {
 790                                 if (debug)
 791                                         warnx("%d execl %s",
 792                                                 getpid(), sep->se_server);
 793                                 /* Clear close-on-exec. */
 794                                 if (fcntl(ctrl, F_SETFD, 0) < 0) {
 795                                         syslog(LOG_ERR,
 796                                             "%s/%s: fcntl (F_SETFD, 0): %m",
 797                                                 sep->se_service, sep->se_proto);
 798                                         _exit(EX_OSERR);
 799                                 }
 800                                 if (ctrl != 0) {
 801                                         dup2(ctrl, 0);
 802                                         close(ctrl);
 803                                 }
 804                                 dup2(0, 1);
 805                                 dup2(0, 2);
 806                                 if ((pwd = getpwnam(sep->se_user)) == NULL) {
 807                                         syslog(LOG_ERR,
 808                                             "%s/%s: %s: no such user",
 809                                                 sep->se_service, sep->se_proto,
 810                                                 sep->se_user);
 811                                         if (sep->se_socktype != SOCK_STREAM)
 812                                                 recv(0, buf, sizeof (buf), 0);
 813                                         _exit(EX_NOUSER);
 814                                 }
 815                                 grp = NULL;
 816                                 if (   sep->se_group != NULL
 817                                     && (grp = getgrnam(sep->se_group)) == NULL
 818                                    ) {
 819                                         syslog(LOG_ERR,
 820                                             "%s/%s: %s: no such group",
 821                                                 sep->se_service, sep->se_proto,
 822                                                 sep->se_group);
 823                                         if (sep->se_socktype != SOCK_STREAM)
 824                                                 recv(0, buf, sizeof (buf), 0);
 825                                         _exit(EX_NOUSER);
 826                                 }
 827                                 if (grp != NULL)
 828                                         pwd->pw_gid = grp->gr_gid;
 829 #ifdef LOGIN_CAP
 830                                 if ((lc = login_getclass(sep->se_class)) == NULL) {
 831                                         /* error syslogged by getclass */
 832                                         syslog(LOG_ERR,
 833                                             "%s/%s: %s: login class error",
 834                                                 sep->se_service, sep->se_proto,
 835                                                 sep->se_class);
 836                                         if (sep->se_socktype != SOCK_STREAM)
 837                                                 recv(0, buf, sizeof (buf), 0);
 838                                         _exit(EX_NOUSER);
 839                                 }
 840 #endif
 841                                 if (setsid() < 0) {
 842                                         syslog(LOG_ERR,
 843                                                 "%s: can't setsid(): %m",
 844                                                  sep->se_service);
 845                                         /* _exit(EX_OSERR); not fatal yet */
 846                                 }
 847 #ifdef LOGIN_CAP
 848                                 if (setusercontext(lc, pwd, pwd->pw_uid,
 849                                     LOGIN_SETALL & ~LOGIN_SETMAC)
 850                                     != 0) {
 851                                         syslog(LOG_ERR,
 852                                          "%s: can't setusercontext(..%s..): %m",
 853                                          sep->se_service, sep->se_user);
 854                                         _exit(EX_OSERR);
 855                                 }
 856                                 login_close(lc);
 857 #else
 858                                 if (pwd->pw_uid) {
 859                                         if (setlogin(sep->se_user) < 0) {
 860                                                 syslog(LOG_ERR,
 861                                                  "%s: can't setlogin(%s): %m",
 862                                                  sep->se_service, sep->se_user);
 863                                                 /* _exit(EX_OSERR); not yet */
 864                                         }
 865                                         if (setgid(pwd->pw_gid) < 0) {
 866                                                 syslog(LOG_ERR,
 867                                                   "%s: can't set gid %d: %m",
 868                                                   sep->se_service, pwd->pw_gid);
 869                                                 _exit(EX_OSERR);
 870                                         }
 871                                         (void) initgroups(pwd->pw_name,
 872                                                         pwd->pw_gid);
 873                                         if (setuid(pwd->pw_uid) < 0) {
 874                                                 syslog(LOG_ERR,
 875                                                   "%s: can't set uid %d: %m",
 876                                                   sep->se_service, pwd->pw_uid);
 877                                                 _exit(EX_OSERR);
 878                                         }
 879                                 }
 880 #endif
 881                                 sigaction(SIGPIPE, &sapipe,
 882                                     (struct sigaction *)0);
 883                                 execv(sep->se_server, sep->se_argv);
 884                                 syslog(LOG_ERR,
 885                                     "cannot execute %s: %m", sep->se_server);
 886                                 if (sep->se_socktype != SOCK_STREAM)
 887                                         recv(0, buf, sizeof (buf), 0);
 888                             }
 889                             if (dofork)
 890                                 _exit(0);
 891                     }
 892                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
 893                             close(ctrl);
 894                 }
 895         }
 896 }
 897
 898 /*
 899  * Add a signal flag to the signal flag queue for later handling
 900  */
 901
 902 static void
 903 flag_signal(int c)
 904 {
 905         char ch = c;
 906
 907         if (write(signalpipe[1], &ch, 1) != 1) {
 908                 syslog(LOG_ERR, "write: %m");
 909                 _exit(EX_OSERR);
 910         }
 911 }
 912
 913 /*
 914  * Record a new child pid for this service. If we've reached the
 915  * limit on children, then stop accepting incoming requests.
 916  */
 917
 918 static void
 919 addchild(struct servtab *sep, pid_t pid)
 920 {
 921         if (sep->se_maxchild <= 0)
 922                 return;
 923 #ifdef SANITY_CHECK
 924         if (sep->se_numchild >= sep->se_maxchild) {
 925                 syslog(LOG_ERR, "%s: %d >= %d",
 926                     __func__, sep->se_numchild, sep->se_maxchild);
 927                 exit(EX_SOFTWARE);
 928         }
 929 #endif
 930         sep->se_pids[sep->se_numchild++] = pid;
 931         if (sep->se_numchild == sep->se_maxchild)
 932                 disable(sep);
 933 }
 934
 935 /*
 936  * Some child process has exited. See if it's on somebody's list.
 937  */
 938
 939 static void
 940 flag_reapchild(int signo __unused)
 941 {
 942         flag_signal('C');
 943 }
 944
 945 static void
 946 reapchild(void)
 947 {
 948         int k, status;
 949         pid_t pid;
 950         struct servtab *sep;
 951
 952         for (;;) {
 953                 pid = wait3(&status, WNOHANG, (struct rusage *)0);
 954                 if (pid <= 0)
 955                         break;
 956                 if (debug)
 957                         warnx("%d reaped, %s %u", pid,
 958                             WIFEXITED(status) ? "status" : "signal",
 959                             WIFEXITED(status) ? WEXITSTATUS(status)
 960                                 : WTERMSIG(status));
 961                 for (sep = servtab; sep; sep = sep->se_next) {
 962                         for (k = 0; k < sep->se_numchild; k++)
 963                                 if (sep->se_pids[k] == pid)
 964                                         break;
 965                         if (k == sep->se_numchild)
 966                                 continue;
 967                         if (sep->se_numchild == sep->se_maxchild)
 968                                 enable(sep);
 969                         sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
 970                         if (WIFSIGNALED(status) || WEXITSTATUS(status))
 971                                 syslog(LOG_WARNING,
 972                                     "%s[%d]: exited, %s %u",
 973                                     sep->se_server, pid,
 974                                     WIFEXITED(status) ? "status" : "signal",
 975                                     WIFEXITED(status) ? WEXITSTATUS(status)
 976                                         : WTERMSIG(status));
 977                         break;
 978                 }
 979                 reapchild_conn(pid);
 980         }
 981 }
 982
 983 static void
 984 flag_config(int signo __unused)
 985 {
 986         flag_signal('H');
 987 }
 988
 989 static void
 990 config(void)
 991 {
 992         struct servtab *sep, *new, **sepp;
 993         long omask;
 994         int new_nomapped;
 995 #ifdef LOGIN_CAP
 996         login_cap_t *lc = NULL;
 997 #endif
 998
 999         if (!setconfig()) {
1000                 syslog(LOG_ERR, "%s: %m", CONFIG);
1001                 return;
1002         }
1003         for (sep = servtab; sep; sep = sep->se_next)
1004                 sep->se_checked = 0;
1005         while ((new = getconfigent())) {
1006                 if (getpwnam(new->se_user) == NULL) {
1007                         syslog(LOG_ERR,
1008                                 "%s/%s: no such user '%s', service ignored",
1009                                 new->se_service, new->se_proto, new->se_user);
1010                         continue;
1011                 }
1012                 if (new->se_group && getgrnam(new->se_group) == NULL) {
1013                         syslog(LOG_ERR,
1014                                 "%s/%s: no such group '%s', service ignored",
1015                                 new->se_service, new->se_proto, new->se_group);
1016                         continue;
1017                 }
1018 #ifdef LOGIN_CAP
1019                 if ((lc = login_getclass(new->se_class)) == NULL) {
1020                         /* error syslogged by getclass */
1021                         syslog(LOG_ERR,
1022                                 "%s/%s: %s: login class error, service ignored",
1023                                 new->se_service, new->se_proto, new->se_class);
1024                         continue;
1025                 }
1026                 login_close(lc);
1027 #endif
1028                 new_nomapped = new->se_nomapped;
1029                 for (sep = servtab; sep; sep = sep->se_next)
1030                         if (strcmp(sep->se_service, new->se_service) == 0 &&
1031                             strcmp(sep->se_proto, new->se_proto) == 0 &&
1032                             sep->se_rpc == new->se_rpc &&
1033                             sep->se_socktype == new->se_socktype &&
1034                             sep->se_family == new->se_family)
1035                                 break;
1036                 if (sep != 0) {
1037                         int i;
1038
1039 #define SWAP(t,a, b) { t c = a; a = b; b = c; }
1040                         omask = sigblock(SIGBLOCK);
1041                         if (sep->se_nomapped != new->se_nomapped) {
1042                                 /* for rpc keep old nommaped till unregister */
1043                                 if (!sep->se_rpc)
1044                                         sep->se_nomapped = new->se_nomapped;
1045                                 sep->se_reset = 1;
1046                         }
1047                         /* copy over outstanding child pids */
1048                         if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
1049                                 new->se_numchild = sep->se_numchild;
1050                                 if (new->se_numchild > new->se_maxchild)
1051                                         new->se_numchild = new->se_maxchild;
1052                                 memcpy(new->se_pids, sep->se_pids,
1053                                     new->se_numchild * sizeof(*new->se_pids));
1054                         }
1055                         SWAP(pid_t *, sep->se_pids, new->se_pids);
1056                         sep->se_maxchild = new->se_maxchild;
1057                         sep->se_numchild = new->se_numchild;
1058                         sep->se_maxcpm = new->se_maxcpm;
1059                         resize_conn(sep, new->se_maxperip);
1060                         sep->se_maxperip = new->se_maxperip;
1061                         sep->se_bi = new->se_bi;
1062                         /* might need to turn on or off service now */
1063                         if (sep->se_fd >= 0) {
1064                               if (sep->se_maxchild > 0
1065                                   && sep->se_numchild == sep->se_maxchild) {
1066                                       if (FD_ISSET(sep->se_fd, &allsock))
1067                                           disable(sep);
1068                               } else {
1069                                       if (!FD_ISSET(sep->se_fd, &allsock))
1070                                           enable(sep);
1071                               }
1072                         }
1073                         sep->se_accept = new->se_accept;
1074                         SWAP(char *, sep->se_user, new->se_user);
1075                         SWAP(char *, sep->se_group, new->se_group);
1076 #ifdef LOGIN_CAP
1077                         SWAP(char *, sep->se_class, new->se_class);
1078 #endif
1079                         SWAP(char *, sep->se_server, new->se_server);
1080                         SWAP(char *, sep->se_server_name, new->se_server_name);
1081                         for (i = 0; i < MAXARGV; i++)
1082                                 SWAP(char *, sep->se_argv[i], new->se_argv[i]);
1083 #ifdef IPSEC
1084                         SWAP(char *, sep->se_policy, new->se_policy);
1085                         ipsecsetup(sep);
1086 #endif
1087                         sigsetmask(omask);
1088                         freeconfig(new);
1089                         if (debug)
1090                                 print_service("REDO", sep);
1091                 } else {
1092                         sep = enter(new);
1093                         if (debug)
1094                                 print_service("ADD ", sep);
1095                 }
1096                 sep->se_checked = 1;
1097                 if (ISMUX(sep)) {
1098                         sep->se_fd = -1;
1099                         continue;
1100                 }
1101                 switch (sep->se_family) {
1102                 case AF_INET:
1103                         if (!v4bind_ok) {
1104                                 sep->se_fd = -1;
1105                                 continue;
1106                         }
1107                         break;
1108 #ifdef INET6
1109                 case AF_INET6:
1110                         if (!v6bind_ok) {
1111                                 sep->se_fd = -1;
1112                                 continue;
1113                         }
1114                         break;
1115 #endif
1116                 }
1117                 if (!sep->se_rpc) {
1118                         if (sep->se_family != AF_UNIX) {
1119                                 sp = getservbyname(sep->se_service, sep->se_proto);
1120                                 if (sp == 0) {
1121                                         syslog(LOG_ERR, "%s/%s: unknown service",
1122                                         sep->se_service, sep->se_proto);
1123                                         sep->se_checked = 0;
1124                                         continue;
1125                                 }
1126                         }
1127                         switch (sep->se_family) {
1128                         case AF_INET:
1129                                 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1130                                         sep->se_ctrladdr4.sin_port =
1131                                                 sp->s_port;
1132                                         sep->se_reset = 1;
1133                                 }
1134                                 break;
1135 #ifdef INET6
1136                         case AF_INET6:
1137                                 if (sp->s_port !=
1138                                     sep->se_ctrladdr6.sin6_port) {
1139                                         sep->se_ctrladdr6.sin6_port =
1140                                                 sp->s_port;
1141                                         sep->se_reset = 1;
1142                                 }
1143                                 break;
1144 #endif
1145                         }
1146                         if (sep->se_reset != 0 && sep->se_fd >= 0)
1147                                 close_sep(sep);
1148                 } else {
1149                         rpc = getrpcbyname(sep->se_service);
1150                         if (rpc == 0) {
1151                                 syslog(LOG_ERR, "%s/%s unknown RPC service",
1152                                         sep->se_service, sep->se_proto);
1153                                 if (sep->se_fd != -1)
1154                                         (void) close(sep->se_fd);
1155                                 sep->se_fd = -1;
1156                                         continue;
1157                         }
1158                         if (sep->se_reset != 0 ||
1159                             rpc->r_number != sep->se_rpc_prog) {
1160                                 if (sep->se_rpc_prog)
1161                                         unregisterrpc(sep);
1162                                 sep->se_rpc_prog = rpc->r_number;
1163                                 if (sep->se_fd != -1)
1164                                         (void) close(sep->se_fd);
1165                                 sep->se_fd = -1;
1166                         }
1167                         sep->se_nomapped = new_nomapped;
1168                 }
1169                 sep->se_reset = 0;
1170                 if (sep->se_fd == -1)
1171                         setup(sep);
1172         }
1173         endconfig();
1174         /*
1175          * Purge anything not looked at above.
1176          */
1177         omask = sigblock(SIGBLOCK);
1178         sepp = &servtab;
1179         while ((sep = *sepp)) {
1180                 if (sep->se_checked) {
1181                         sepp = &sep->se_next;
1182                         continue;
1183                 }
1184                 *sepp = sep->se_next;
1185                 if (sep->se_fd >= 0)
1186                         close_sep(sep);
1187                 if (debug)
1188                         print_service("FREE", sep);
1189                 if (sep->se_rpc && sep->se_rpc_prog > 0)
1190                         unregisterrpc(sep);
1191                 freeconfig(sep);
1192                 free(sep);
1193         }
1194         (void) sigsetmask(omask);
1195 }
1196
1197 static void
1198 unregisterrpc(struct servtab *sep)
1199 {
1200         u_int i;
1201         struct servtab *sepp;
1202         long omask;
1203         struct netconfig *netid4, *netid6;
1204
1205         omask = sigblock(SIGBLOCK);
1206         netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf;
1207         netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf;
1208         if (sep->se_family == AF_INET)
1209                 netid6 = NULL;
1210         else if (sep->se_nomapped)
1211                 netid4 = NULL;
1212         /*
1213          * Conflict if same prog and protocol - In that case one should look
1214          * to versions, but it is not interesting: having separate servers for
1215          * different versions does not work well.
1216          * Therefore one do not unregister if there is a conflict.
1217          * There is also transport conflict if destroying INET when INET46
1218          * exists, or destroying INET46 when INET exists
1219          */
1220         for (sepp = servtab; sepp; sepp = sepp->se_next) {
1221                 if (sepp == sep)
1222                         continue;
1223                 if (sepp->se_checked == 0 ||
1224                     !sepp->se_rpc ||
1225                     strcmp(sep->se_proto, sepp->se_proto) != 0 ||
1226                     sep->se_rpc_prog != sepp->se_rpc_prog)
1227                         continue;
1228                 if (sepp->se_family == AF_INET)
1229                         netid4 = NULL;
1230                 if (sepp->se_family == AF_INET6) {
1231                         netid6 = NULL;
1232                         if (!sep->se_nomapped)
1233                                 netid4 = NULL;
1234                 }
1235                 if (netid4 == NULL && netid6 == NULL)
1236                         return;
1237         }
1238         if (debug)
1239                 print_service("UNREG", sep);
1240         for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1241                 if (netid4)
1242                         rpcb_unset(sep->se_rpc_prog, i, netid4);
1243                 if (netid6)
1244                         rpcb_unset(sep->se_rpc_prog, i, netid6);
1245         }
1246         if (sep->se_fd != -1)
1247                 (void) close(sep->se_fd);
1248         sep->se_fd = -1;
1249         (void) sigsetmask(omask);
1250 }
1251
1252 static void
1253 flag_retry(int signo __unused)
1254 {
1255         flag_signal('A');
1256 }
1257
1258 static void
1259 retry(void)
1260 {
1261         struct servtab *sep;
1262
1263         timingout = 0;
1264         for (sep = servtab; sep; sep = sep->se_next)
1265                 if (sep->se_fd == -1 && !ISMUX(sep))
1266                         setup(sep);
1267 }
1268
1269 static void
1270 setup(struct servtab *sep)
1271 {
1272         int on = 1;
1273
1274         /* Set all listening sockets to close-on-exec. */
1275         if ((sep->se_fd = socket(sep->se_family,
1276             sep->se_socktype | SOCK_CLOEXEC, 0)) < 0) {
1277                 if (debug)
1278                         warn("socket failed on %s/%s",
1279                                 sep->se_service, sep->se_proto);
1280                 syslog(LOG_ERR, "%s/%s: socket: %m",
1281                     sep->se_service, sep->se_proto);
1282                 return;
1283         }
1284 #define turnon(fd, opt) \
1285 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1286         if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1287             turnon(sep->se_fd, SO_DEBUG) < 0)
1288                 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1289         if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1290                 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1291 #ifdef SO_PRIVSTATE
1292         if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1293                 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1294 #endif
1295         /* tftpd opens a new connection then needs more infos */
1296 #ifdef INET6
1297         if ((sep->se_family == AF_INET6) &&
1298             (strcmp(sep->se_proto, "udp") == 0) &&
1299             (sep->se_accept == 0) &&
1300             (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
1301                         (char *)&on, sizeof (on)) < 0))
1302                 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1303         if (sep->se_family == AF_INET6) {
1304                 int flag = sep->se_nomapped ? 1 : 0;
1305                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1306                                (char *)&flag, sizeof (flag)) < 0)
1307                         syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1308         }
1309 #endif
1310 #undef turnon
1311 #ifdef IPSEC
1312         ipsecsetup(sep);
1313 #endif
1314         if (sep->se_family == AF_UNIX) {
1315                 (void) unlink(sep->se_ctrladdr_un.sun_path);
1316                 umask(0777); /* Make socket with conservative permissions */
1317         }
1318         if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1319             sep->se_ctrladdr_size) < 0) {
1320                 if (debug)
1321                         warn("bind failed on %s/%s",
1322                                 sep->se_service, sep->se_proto);
1323                 syslog(LOG_ERR, "%s/%s: bind: %m",
1324                     sep->se_service, sep->se_proto);
1325                 (void) close(sep->se_fd);
1326                 sep->se_fd = -1;
1327                 if (!timingout) {
1328                         timingout = 1;
1329                         alarm(RETRYTIME);
1330                 }
1331                 if (sep->se_family == AF_UNIX)
1332                         umask(mask);
1333                 return;
1334         }
1335         if (sep->se_family == AF_UNIX) {
1336                 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1337                 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1338                         syslog(LOG_ERR, "chown socket: %m");
1339                 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1340                         syslog(LOG_ERR, "chmod socket: %m");
1341                 umask(mask);
1342         }
1343         if (sep->se_rpc) {
1344                 u_int i;
1345                 socklen_t len = sep->se_ctrladdr_size;
1346                 struct netconfig *netid, *netid2 = NULL;
1347 #ifdef INET6
1348                 struct sockaddr_in sock;
1349 #endif
1350                 struct netbuf nbuf, nbuf2;
1351
1352                 if (getsockname(sep->se_fd,
1353                                 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1354                         syslog(LOG_ERR, "%s/%s: getsockname: %m",
1355                                sep->se_service, sep->se_proto);
1356                         (void) close(sep->se_fd);
1357                         sep->se_fd = -1;
1358                         return;
1359                 }
1360                 nbuf.buf = &sep->se_ctrladdr;
1361                 nbuf.len = sep->se_ctrladdr.sa_len;
1362                 if (sep->se_family == AF_INET)
1363                         netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf;
1364 #ifdef INET6
1365                 else  {
1366                         netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf;
1367                         if (!sep->se_nomapped) { /* INET and INET6 */
1368                                 netid2 = netid==udp6conf? udpconf:tcpconf;
1369                                 memset(&sock, 0, sizeof sock);  /* ADDR_ANY */
1370                                 nbuf2.buf = &sock;
1371                                 nbuf2.len = sock.sin_len = sizeof sock;
1372                                 sock.sin_family = AF_INET;
1373                                 sock.sin_port = sep->se_ctrladdr6.sin6_port;
1374                         }
1375                 }
1376 #endif
1377                 if (debug)
1378                         print_service("REG ", sep);
1379                 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1380                         rpcb_unset(sep->se_rpc_prog, i, netid);
1381                         rpcb_set(sep->se_rpc_prog, i, netid, &nbuf);
1382                         if (netid2) {
1383                                 rpcb_unset(sep->se_rpc_prog, i, netid2);
1384                                 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2);
1385                         }
1386                 }
1387         }
1388         if (sep->se_socktype == SOCK_STREAM)
1389                 listen(sep->se_fd, -1);
1390         enable(sep);
1391         if (debug) {
1392                 warnx("registered %s on %d",
1393                         sep->se_server, sep->se_fd);
1394         }
1395 }
1396
1397 #ifdef IPSEC
1398 static void
1399 ipsecsetup(struct servtab *sep)
1400 {
1401         char *buf;
1402         char *policy_in = NULL;
1403         char *policy_out = NULL;
1404         int level;
1405         int opt;
1406
1407         switch (sep->se_family) {
1408         case AF_INET:
1409                 level = IPPROTO_IP;
1410                 opt = IP_IPSEC_POLICY;
1411                 break;
1412 #ifdef INET6
1413         case AF_INET6:
1414                 level = IPPROTO_IPV6;
1415                 opt = IPV6_IPSEC_POLICY;
1416                 break;
1417 #endif
1418         default:
1419                 return;
1420         }
1421
1422         if (!sep->se_policy || sep->se_policy[0] == '\0') {
1423                 static char def_in[] = "in entrust", def_out[] = "out entrust";
1424                 policy_in = def_in;
1425                 policy_out = def_out;
1426         } else {
1427                 if (!strncmp("in", sep->se_policy, 2))
1428                         policy_in = sep->se_policy;
1429                 else if (!strncmp("out", sep->se_policy, 3))
1430                         policy_out = sep->se_policy;
1431                 else {
1432                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1433                                 sep->se_policy);
1434                         return;
1435                 }
1436         }
1437
1438         if (policy_in != NULL) {
1439                 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1440                 if (buf != NULL) {
1441                         if (setsockopt(sep->se_fd, level, opt,
1442                                         buf, ipsec_get_policylen(buf)) < 0 &&
1443                             debug != 0)
1444                                 warnx("%s/%s: ipsec initialization failed; %s",
1445                                       sep->se_service, sep->se_proto,
1446                                       policy_in);
1447                         free(buf);
1448                 } else
1449                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1450                                 policy_in);
1451         }
1452         if (policy_out != NULL) {
1453                 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1454                 if (buf != NULL) {
1455                         if (setsockopt(sep->se_fd, level, opt,
1456                                         buf, ipsec_get_policylen(buf)) < 0 &&
1457                             debug != 0)
1458                                 warnx("%s/%s: ipsec initialization failed; %s",
1459                                       sep->se_service, sep->se_proto,
1460                                       policy_out);
1461                         free(buf);
1462                 } else
1463                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1464                                 policy_out);
1465         }
1466 }
1467 #endif
1468
1469 /*
1470  * Finish with a service and its socket.
1471  */
1472 static void
1473 close_sep(struct servtab *sep)
1474 {
1475         if (sep->se_fd >= 0) {
1476                 if (FD_ISSET(sep->se_fd, &allsock))
1477                         disable(sep);
1478                 (void) close(sep->se_fd);
1479                 sep->se_fd = -1;
1480         }
1481         sep->se_count = 0;
1482         sep->se_numchild = 0;   /* forget about any existing children */
1483 }
1484
1485 static int
1486 matchservent(const char *name1, const char *name2, const char *proto)
1487 {
1488         char **alias, *p;
1489         struct servent *se;
1490
1491         if (strcmp(proto, "unix") == 0) {
1492                 if ((p = strrchr(name1, '/')) != NULL)
1493                         name1 = p + 1;
1494                 if ((p = strrchr(name2, '/')) != NULL)
1495                         name2 = p + 1;
1496         }
1497         if (strcmp(name1, name2) == 0)
1498                 return(1);
1499         if ((se = getservbyname(name1, proto)) != NULL) {
1500                 if (strcmp(name2, se->s_name) == 0)
1501                         return(1);
1502                 for (alias = se->s_aliases; *alias; alias++)
1503                         if (strcmp(name2, *alias) == 0)
1504                                 return(1);
1505         }
1506         return(0);
1507 }
1508
1509 static struct servtab *
1510 enter(struct servtab *cp)
1511 {
1512         struct servtab *sep;
1513         long omask;
1514
1515         sep = (struct servtab *)malloc(sizeof (*sep));
1516         if (sep == (struct servtab *)0) {
1517                 syslog(LOG_ERR, "malloc: %m");
1518                 exit(EX_OSERR);
1519         }
1520         *sep = *cp;
1521         sep->se_fd = -1;
1522         omask = sigblock(SIGBLOCK);
1523         sep->se_next = servtab;
1524         servtab = sep;
1525         sigsetmask(omask);
1526         return (sep);
1527 }
1528
1529 static void
1530 enable(struct servtab *sep)
1531 {
1532         if (debug)
1533                 warnx(
1534                     "enabling %s, fd %d", sep->se_service, sep->se_fd);
1535 #ifdef SANITY_CHECK
1536         if (sep->se_fd < 0) {
1537                 syslog(LOG_ERR,
1538                     "%s: %s: bad fd", __func__, sep->se_service);
1539                 exit(EX_SOFTWARE);
1540         }
1541         if (ISMUX(sep)) {
1542                 syslog(LOG_ERR,
1543                     "%s: %s: is mux", __func__, sep->se_service);
1544                 exit(EX_SOFTWARE);
1545         }
1546         if (FD_ISSET(sep->se_fd, &allsock)) {
1547                 syslog(LOG_ERR,
1548                     "%s: %s: not off", __func__, sep->se_service);
1549                 exit(EX_SOFTWARE);
1550         }
1551         nsock++;
1552 #endif
1553         FD_SET(sep->se_fd, &allsock);
1554         if (sep->se_fd > maxsock)
1555                 maxsock = sep->se_fd;
1556 }
1557
1558 static void
1559 disable(struct servtab *sep)
1560 {
1561         if (debug)
1562                 warnx(
1563                     "disabling %s, fd %d", sep->se_service, sep->se_fd);
1564 #ifdef SANITY_CHECK
1565         if (sep->se_fd < 0) {
1566                 syslog(LOG_ERR,
1567                     "%s: %s: bad fd", __func__, sep->se_service);
1568                 exit(EX_SOFTWARE);
1569         }
1570         if (ISMUX(sep)) {
1571                 syslog(LOG_ERR,
1572                     "%s: %s: is mux", __func__, sep->se_service);
1573                 exit(EX_SOFTWARE);
1574         }
1575         if (!FD_ISSET(sep->se_fd, &allsock)) {
1576                 syslog(LOG_ERR,
1577                     "%s: %s: not on", __func__, sep->se_service);
1578                 exit(EX_SOFTWARE);
1579         }
1580         if (nsock == 0) {
1581                 syslog(LOG_ERR, "%s: nsock=0", __func__);
1582                 exit(EX_SOFTWARE);
1583         }
1584         nsock--;
1585 #endif
1586         FD_CLR(sep->se_fd, &allsock);
1587         if (sep->se_fd == maxsock)
1588                 maxsock--;
1589 }
1590
1591 static FILE     *fconfig = NULL;
1592 static struct   servtab serv;
1593 static char     line[LINE_MAX];
1594
1595 static int
1596 setconfig(void)
1597 {
1598
1599         if (fconfig != NULL) {
1600                 fseek(fconfig, 0L, SEEK_SET);
1601                 return (1);
1602         }
1603         fconfig = fopen(CONFIG, "r");
1604         return (fconfig != NULL);
1605 }
1606
1607 static void
1608 endconfig(void)
1609 {
1610         if (fconfig) {
1611                 (void) fclose(fconfig);
1612                 fconfig = NULL;
1613         }
1614 }
1615
1616 static struct servtab *
1617 getconfigent(void)
1618 {
1619         struct servtab *sep = &serv;
1620         int argc;
1621         char *cp, *arg, *s;
1622         char *versp;
1623         static char TCPMUX_TOKEN[] = "tcpmux/";
1624 #define MUX_LEN         (sizeof(TCPMUX_TOKEN)-1)
1625 #ifdef IPSEC
1626         char *policy;
1627 #endif
1628         int v4bind;
1629 #ifdef INET6
1630         int v6bind;
1631 #endif
1632         int i;
1633
1634 #ifdef IPSEC
1635         policy = NULL;
1636 #endif
1637 more:
1638         v4bind = 0;
1639 #ifdef INET6
1640         v6bind = 0;
1641 #endif
1642         while ((cp = nextline(fconfig)) != NULL) {
1643 #ifdef IPSEC
1644                 /* lines starting with #@ is not a comment, but the policy */
1645                 if (cp[0] == '#' && cp[1] == '@') {
1646                         char *p;
1647                         for (p = cp + 2; p && *p && isspace(*p); p++)
1648                                 ;
1649                         if (*p == '\0') {
1650                                 if (policy)
1651                                         free(policy);
1652                                 policy = NULL;
1653                         } else if (ipsec_get_policylen(p) >= 0) {
1654                                 if (policy)
1655                                         free(policy);
1656                                 policy = newstr(p);
1657                         } else {
1658                                 syslog(LOG_ERR,
1659                                         "%s: invalid ipsec policy \"%s\"",
1660                                         CONFIG, p);
1661                                 exit(EX_CONFIG);
1662                         }
1663                 }
1664 #endif
1665                 if (*cp == '#' || *cp == '\0')
1666                         continue;
1667                 break;
1668         }
1669         if (cp == NULL)
1670                 return ((struct servtab *)0);
1671         /*
1672          * clear the static buffer, since some fields (se_ctrladdr,
1673          * for example) don't get initialized here.
1674          */
1675         memset(sep, 0, sizeof *sep);
1676         arg = skip(&cp);
1677         if (cp == NULL) {
1678                 /* got an empty line containing just blanks/tabs. */
1679                 goto more;
1680         }
1681         if (arg[0] == ':') { /* :user:group:perm: */
1682                 char *user, *group, *perm;
1683                 struct passwd *pw;
1684                 struct group *gr;
1685                 user = arg+1;
1686                 if ((group = strchr(user, ':')) == NULL) {
1687                         syslog(LOG_ERR, "no group after user '%s'", user);
1688                         goto more;
1689                 }
1690                 *group++ = '\0';
1691                 if ((perm = strchr(group, ':')) == NULL) {
1692                         syslog(LOG_ERR, "no mode after group '%s'", group);
1693                         goto more;
1694                 }
1695                 *perm++ = '\0';
1696                 if ((pw = getpwnam(user)) == NULL) {
1697                         syslog(LOG_ERR, "no such user '%s'", user);
1698                         goto more;
1699                 }
1700                 sep->se_sockuid = pw->pw_uid;
1701                 if ((gr = getgrnam(group)) == NULL) {
1702                         syslog(LOG_ERR, "no such user '%s'", group);
1703                         goto more;
1704                 }
1705                 sep->se_sockgid = gr->gr_gid;
1706                 sep->se_sockmode = strtol(perm, &arg, 8);
1707                 if (*arg != ':') {
1708                         syslog(LOG_ERR, "bad mode '%s'", perm);
1709                         goto more;
1710                 }
1711                 *arg++ = '\0';
1712         } else {
1713                 sep->se_sockuid = euid;
1714                 sep->se_sockgid = egid;
1715                 sep->se_sockmode = 0200;
1716         }
1717         if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1718                 char *c = arg + MUX_LEN;
1719                 if (*c == '+') {
1720                         sep->se_type = MUXPLUS_TYPE;
1721                         c++;
1722                 } else
1723                         sep->se_type = MUX_TYPE;
1724                 sep->se_service = newstr(c);
1725         } else {
1726                 sep->se_service = newstr(arg);
1727                 sep->se_type = NORM_TYPE;
1728         }
1729         arg = sskip(&cp);
1730         if (strcmp(arg, "stream") == 0)
1731                 sep->se_socktype = SOCK_STREAM;
1732         else if (strcmp(arg, "dgram") == 0)
1733                 sep->se_socktype = SOCK_DGRAM;
1734         else if (strcmp(arg, "rdm") == 0)
1735                 sep->se_socktype = SOCK_RDM;
1736         else if (strcmp(arg, "seqpacket") == 0)
1737                 sep->se_socktype = SOCK_SEQPACKET;
1738         else if (strcmp(arg, "raw") == 0)
1739                 sep->se_socktype = SOCK_RAW;
1740         else
1741                 sep->se_socktype = -1;
1742
1743         arg = sskip(&cp);
1744         if (strncmp(arg, "tcp", 3) == 0) {
1745                 sep->se_proto = newstr(strsep(&arg, "/"));
1746                 if (arg != NULL && (strcmp(arg, "faith") == 0)) {
1747                         syslog(LOG_ERR, "faith has been deprecated");
1748                         goto more;
1749                 }
1750         } else {
1751                 if (sep->se_type == NORM_TYPE &&
1752                     strncmp(arg, "faith/", 6) == 0) {
1753                         syslog(LOG_ERR, "faith has been deprecated");
1754                         goto more;
1755                 }
1756                 sep->se_proto = newstr(arg);
1757         }
1758         if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1759                 memmove(sep->se_proto, sep->se_proto + 4,
1760                     strlen(sep->se_proto) + 1 - 4);
1761                 sep->se_rpc = 1;
1762                 sep->se_rpc_prog = sep->se_rpc_lowvers =
1763                         sep->se_rpc_highvers = 0;
1764                 if ((versp = strrchr(sep->se_service, '/'))) {
1765                         *versp++ = '\0';
1766                         switch (sscanf(versp, "%u-%u",
1767                                        &sep->se_rpc_lowvers,
1768                                        &sep->se_rpc_highvers)) {
1769                         case 2:
1770                                 break;
1771                         case 1:
1772                                 sep->se_rpc_highvers =
1773                                         sep->se_rpc_lowvers;
1774                                 break;
1775                         default:
1776                                 syslog(LOG_ERR,
1777                                         "bad RPC version specifier; %s",
1778                                         sep->se_service);
1779                                 freeconfig(sep);
1780                                 goto more;
1781                         }
1782                 }
1783                 else {
1784                         sep->se_rpc_lowvers =
1785                                 sep->se_rpc_highvers = 1;
1786                 }
1787         }
1788         sep->se_nomapped = 0;
1789         if (strcmp(sep->se_proto, "unix") == 0) {
1790                 sep->se_family = AF_UNIX;
1791         } else {
1792                 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1793 #ifdef INET6
1794                         if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1795                                 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1796                                 v6bind = 1;
1797                                 continue;
1798                         }
1799 #endif
1800                         if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1801                                 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1802                                 v4bind = 1;
1803                                 continue;
1804                         }
1805                         /* illegal version num */
1806                         syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1807                         freeconfig(sep);
1808                         goto more;
1809                 }
1810 #ifdef INET6
1811                 if (v6bind && !v6bind_ok) {
1812                         syslog(LOG_INFO, "IPv6 bind is ignored for %s",
1813                                sep->se_service);
1814                         if (v4bind && v4bind_ok)
1815                                 v6bind = 0;
1816                         else {
1817                                 freeconfig(sep);
1818                                 goto more;
1819                         }
1820                 }
1821                 if (v6bind) {
1822                         sep->se_family = AF_INET6;
1823                         if (!v4bind || !v4bind_ok)
1824                                 sep->se_nomapped = 1;
1825                 } else
1826 #endif
1827                 { /* default to v4 bind if not v6 bind */
1828                         if (!v4bind_ok) {
1829                                 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1830                                        sep->se_service);
1831                                 freeconfig(sep);
1832                                 goto more;
1833                         }
1834                         sep->se_family = AF_INET;
1835                 }
1836         }
1837         /* init ctladdr */
1838         switch(sep->se_family) {
1839         case AF_INET:
1840                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1841                        sizeof(sep->se_ctrladdr4));
1842                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1843                 break;
1844 #ifdef INET6
1845         case AF_INET6:
1846                 memcpy(&sep->se_ctrladdr6, bind_sa6,
1847                        sizeof(sep->se_ctrladdr6));
1848                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1849                 break;
1850 #endif
1851         case AF_UNIX:
1852                 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1853                         syslog(LOG_ERR,
1854                             "domain socket pathname too long for service %s",
1855                             sep->se_service);
1856                         goto more;
1857                 }
1858                 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1859                 sep->se_ctrladdr_un.sun_family = sep->se_family;
1860                 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1861                 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1862                 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1863         }
1864         arg = sskip(&cp);
1865         if (!strncmp(arg, "wait", 4))
1866                 sep->se_accept = 0;
1867         else if (!strncmp(arg, "nowait", 6))
1868                 sep->se_accept = 1;
1869         else {
1870                 syslog(LOG_ERR,
1871                         "%s: bad wait/nowait for service %s",
1872                         CONFIG, sep->se_service);
1873                 goto more;
1874         }
1875         sep->se_maxchild = -1;
1876         sep->se_maxcpm = -1;
1877         sep->se_maxperip = -1;
1878         if ((s = strchr(arg, '/')) != NULL) {
1879                 char *eptr;
1880                 u_long val;
1881
1882                 val = strtoul(s + 1, &eptr, 10);
1883                 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1884                         syslog(LOG_ERR,
1885                                 "%s: bad max-child for service %s",
1886                                 CONFIG, sep->se_service);
1887                         goto more;
1888                 }
1889                 if (debug)
1890                         if (!sep->se_accept && val != 1)
1891                                 warnx("maxchild=%lu for wait service %s"
1892                                     " not recommended", val, sep->se_service);
1893                 sep->se_maxchild = val;
1894                 if (*eptr == '/')
1895                         sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1896                 if (*eptr == '/')
1897                         sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1898                 /*
1899                  * explicitly do not check for \0 for future expansion /
1900                  * backwards compatibility
1901                  */
1902         }
1903         if (ISMUX(sep)) {
1904                 /*
1905                  * Silently enforce "nowait" mode for TCPMUX services
1906                  * since they don't have an assigned port to listen on.
1907                  */
1908                 sep->se_accept = 1;
1909                 if (strcmp(sep->se_proto, "tcp")) {
1910                         syslog(LOG_ERR,
1911                                 "%s: bad protocol for tcpmux service %s",
1912                                 CONFIG, sep->se_service);
1913                         goto more;
1914                 }
1915                 if (sep->se_socktype != SOCK_STREAM) {
1916                         syslog(LOG_ERR,
1917                                 "%s: bad socket type for tcpmux service %s",
1918                                 CONFIG, sep->se_service);
1919                         goto more;
1920                 }
1921         }
1922         sep->se_user = newstr(sskip(&cp));
1923 #ifdef LOGIN_CAP
1924         if ((s = strrchr(sep->se_user, '/')) != NULL) {
1925                 *s = '\0';
1926                 sep->se_class = newstr(s + 1);
1927         } else
1928                 sep->se_class = newstr(RESOURCE_RC);
1929 #endif
1930         if ((s = strrchr(sep->se_user, ':')) != NULL) {
1931                 *s = '\0';
1932                 sep->se_group = newstr(s + 1);
1933         } else
1934                 sep->se_group = NULL;
1935         sep->se_server = newstr(sskip(&cp));
1936         if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1937                 sep->se_server_name++;
1938         if (strcmp(sep->se_server, "internal") == 0) {
1939                 struct biltin *bi;
1940
1941                 for (bi = biltins; bi->bi_service; bi++)
1942                         if (bi->bi_socktype == sep->se_socktype &&
1943                             matchservent(bi->bi_service, sep->se_service,
1944                             sep->se_proto))
1945                                 break;
1946                 if (bi->bi_service == 0) {
1947                         syslog(LOG_ERR, "internal service %s unknown",
1948                                 sep->se_service);
1949                         goto more;
1950                 }
1951                 sep->se_accept = 1;     /* force accept mode for built-ins */
1952                 sep->se_bi = bi;
1953         } else
1954                 sep->se_bi = NULL;
1955         if (sep->se_maxperip < 0)
1956                 sep->se_maxperip = maxperip;
1957         if (sep->se_maxcpm < 0)
1958                 sep->se_maxcpm = maxcpm;
1959         if (sep->se_maxchild < 0) {     /* apply default max-children */
1960                 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1961                         sep->se_maxchild = sep->se_bi->bi_maxchild;
1962                 else if (sep->se_accept)
1963                         sep->se_maxchild = MAX(maxchild, 0);
1964                 else
1965                         sep->se_maxchild = 1;
1966         }
1967         if (sep->se_maxchild > 0) {
1968                 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1969                 if (sep->se_pids == NULL) {
1970                         syslog(LOG_ERR, "malloc: %m");
1971                         exit(EX_OSERR);
1972                 }
1973         }
1974         argc = 0;
1975         for (arg = skip(&cp); cp; arg = skip(&cp))
1976                 if (argc < MAXARGV) {
1977                         sep->se_argv[argc++] = newstr(arg);
1978                 } else {
1979                         syslog(LOG_ERR,
1980                                 "%s: too many arguments for service %s",
1981                                 CONFIG, sep->se_service);
1982                         goto more;
1983                 }
1984         while (argc <= MAXARGV)
1985                 sep->se_argv[argc++] = NULL;
1986         for (i = 0; i < PERIPSIZE; ++i)
1987                 LIST_INIT(&sep->se_conn[i]);
1988 #ifdef IPSEC
1989         sep->se_policy = policy ? newstr(policy) : NULL;
1990 #endif
1991         return (sep);
1992 }
1993
1994 static void
1995 freeconfig(struct servtab *cp)
1996 {
1997         int i;
1998
1999         if (cp->se_service)
2000                 free(cp->se_service);
2001         if (cp->se_proto)
2002                 free(cp->se_proto);
2003         if (cp->se_user)
2004                 free(cp->se_user);
2005         if (cp->se_group)
2006                 free(cp->se_group);
2007 #ifdef LOGIN_CAP
2008         if (cp->se_class)
2009                 free(cp->se_class);
2010 #endif
2011         if (cp->se_server)
2012                 free(cp->se_server);
2013         if (cp->se_pids)
2014                 free(cp->se_pids);
2015         for (i = 0; i < MAXARGV; i++)
2016                 if (cp->se_argv[i])
2017                         free(cp->se_argv[i]);
2018         free_connlist(cp);
2019 #ifdef IPSEC
2020         if (cp->se_policy)
2021                 free(cp->se_policy);
2022 #endif
2023 }
2024
2025
2026 /*
2027  * Safe skip - if skip returns null, log a syntax error in the
2028  * configuration file and exit.
2029  */
2030 static char *
2031 sskip(char **cpp)
2032 {
2033         char *cp;
2034
2035         cp = skip(cpp);
2036         if (cp == NULL) {
2037                 syslog(LOG_ERR, "%s: syntax error", CONFIG);
2038                 exit(EX_DATAERR);
2039         }
2040         return (cp);
2041 }
2042
2043 static char *
2044 skip(char **cpp)
2045 {
2046         char *cp = *cpp;
2047         char *start;
2048         char quote = '\0';
2049
2050 again:
2051         while (*cp == ' ' || *cp == '\t')
2052                 cp++;
2053         if (*cp == '\0') {
2054                 int c;
2055
2056                 c = getc(fconfig);
2057                 (void) ungetc(c, fconfig);
2058                 if (c == ' ' || c == '\t')
2059                         if ((cp = nextline(fconfig)))
2060                                 goto again;
2061                 *cpp = (char *)0;
2062                 return ((char *)0);
2063         }
2064         if (*cp == '"' || *cp == '\'')
2065                 quote = *cp++;
2066         start = cp;
2067         if (quote)
2068                 while (*cp && *cp != quote)
2069                         cp++;
2070         else
2071                 while (*cp && *cp != ' ' && *cp != '\t')
2072                         cp++;
2073         if (*cp != '\0')
2074                 *cp++ = '\0';
2075         *cpp = cp;
2076         return (start);
2077 }
2078
2079 static char *
2080 nextline(FILE *fd)
2081 {
2082         char *cp;
2083
2084         if (fgets(line, sizeof (line), fd) == NULL)
2085                 return ((char *)0);
2086         cp = strchr(line, '\n');
2087         if (cp)
2088                 *cp = '\0';
2089         return (line);
2090 }
2091
2092 static char *
2093 newstr(const char *cp)
2094 {
2095         char *cr;
2096
2097         if ((cr = strdup(cp != NULL ? cp : "")))
2098                 return (cr);
2099         syslog(LOG_ERR, "strdup: %m");
2100         exit(EX_OSERR);
2101 }
2102
2103 void
2104 inetd_setproctitle(const char *a, int s)
2105 {
2106         socklen_t size;
2107         struct sockaddr_storage ss;
2108         char buf[80], pbuf[NI_MAXHOST];
2109
2110         size = sizeof(ss);
2111         if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2112                 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2113                             NULL, 0, NI_NUMERICHOST);
2114                 (void) sprintf(buf, "%s [%s]", a, pbuf);
2115         } else
2116                 (void) sprintf(buf, "%s", a);
2117         setproctitle("%s", buf);
2118 }
2119
2120 int
2121 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2122 {
2123         struct servtab *se2;
2124         char pname[NI_MAXHOST];
2125
2126         for (se2 = servtab; se2; se2 = se2->se_next) {
2127                 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2128                         continue;
2129
2130                 switch (se2->se_family) {
2131                 case AF_INET:
2132                         if (csatosin(sa)->sin_port ==
2133                             se2->se_ctrladdr4.sin_port)
2134                                 goto isloop;
2135                         continue;
2136 #ifdef INET6
2137                 case AF_INET6:
2138                         if (csatosin6(sa)->sin6_port ==
2139                             se2->se_ctrladdr6.sin6_port)
2140                                 goto isloop;
2141                         continue;
2142 #endif
2143                 default:
2144                         continue;
2145                 }
2146         isloop:
2147                 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2148                             NI_NUMERICHOST);
2149                 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2150                        sep->se_service, sep->se_proto,
2151                        se2->se_service, se2->se_proto,
2152                        pname);
2153                 return 1;
2154         }
2155         return 0;
2156 }
2157
2158 /*
2159  * print_service:
2160  *      Dump relevant information to stderr
2161  */
2162 static void
2163 print_service(const char *action, const struct servtab *sep)
2164 {
2165         fprintf(stderr,
2166             "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2167 #ifdef LOGIN_CAP
2168             "class=%s"
2169 #endif
2170             " builtin=%p server=%s"
2171 #ifdef IPSEC
2172             " policy=\"%s\""
2173 #endif
2174             "\n",
2175             action, sep->se_service, sep->se_proto,
2176             sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2177 #ifdef LOGIN_CAP
2178             sep->se_class,
2179 #endif
2180             (void *) sep->se_bi, sep->se_server
2181 #ifdef IPSEC
2182             , (sep->se_policy ? sep->se_policy : "")
2183 #endif
2184             );
2185 }
2186
2187 #define CPMHSIZE        256
2188 #define CPMHMASK        (CPMHSIZE-1)
2189 #define CHTGRAN         10
2190 #define CHTSIZE         6
2191
2192 typedef struct CTime {
2193         unsigned long   ct_Ticks;
2194         int             ct_Count;
2195 } CTime;
2196
2197 typedef struct CHash {
2198         union {
2199                 struct in_addr  c4_Addr;
2200                 struct in6_addr c6_Addr;
2201         } cu_Addr;
2202 #define ch_Addr4        cu_Addr.c4_Addr
2203 #define ch_Addr6        cu_Addr.c6_Addr
2204         int             ch_Family;
2205         time_t          ch_LTime;
2206         char            *ch_Service;
2207         CTime           ch_Times[CHTSIZE];
2208 } CHash;
2209
2210 static CHash    CHashAry[CPMHSIZE];
2211
2212 static int
2213 cpmip(const struct servtab *sep, int ctrl)
2214 {
2215         struct sockaddr_storage rss;
2216         socklen_t rssLen = sizeof(rss);
2217         int r = 0;
2218
2219         /*
2220          * If getpeername() fails, just let it through (if logging is
2221          * enabled the condition is caught elsewhere)
2222          */
2223
2224         if (sep->se_maxcpm > 0 &&
2225            (sep->se_family == AF_INET || sep->se_family == AF_INET6) &&
2226             getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2227                 time_t t = time(NULL);
2228                 int hv = 0xABC3D20F;
2229                 int i;
2230                 int cnt = 0;
2231                 CHash *chBest = NULL;
2232                 unsigned int ticks = t / CHTGRAN;
2233                 struct sockaddr_in *sin4;
2234 #ifdef INET6
2235                 struct sockaddr_in6 *sin6;
2236 #endif
2237
2238                 sin4 = (struct sockaddr_in *)&rss;
2239 #ifdef INET6
2240                 sin6 = (struct sockaddr_in6 *)&rss;
2241 #endif
2242                 {
2243                         char *p;
2244                         int addrlen;
2245
2246                         switch (rss.ss_family) {
2247                         case AF_INET:
2248                                 p = (char *)&sin4->sin_addr;
2249                                 addrlen = sizeof(struct in_addr);
2250                                 break;
2251 #ifdef INET6
2252                         case AF_INET6:
2253                                 p = (char *)&sin6->sin6_addr;
2254                                 addrlen = sizeof(struct in6_addr);
2255                                 break;
2256 #endif
2257                         default:
2258                                 /* should not happen */
2259                                 return -1;
2260                         }
2261
2262                         for (i = 0; i < addrlen; ++i, ++p) {
2263                                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2264                         }
2265                         hv = (hv ^ (hv >> 16));
2266                 }
2267                 for (i = 0; i < 5; ++i) {
2268                         CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2269
2270                         if (rss.ss_family == AF_INET &&
2271                             ch->ch_Family == AF_INET &&
2272                             sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2273                             ch->ch_Service && strcmp(sep->se_service,
2274                             ch->ch_Service) == 0) {
2275                                 chBest = ch;
2276                                 break;
2277                         }
2278 #ifdef INET6
2279                         if (rss.ss_family == AF_INET6 &&
2280                             ch->ch_Family == AF_INET6 &&
2281                             IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2282                                                &ch->ch_Addr6) != 0 &&
2283                             ch->ch_Service && strcmp(sep->se_service,
2284                             ch->ch_Service) == 0) {
2285                                 chBest = ch;
2286                                 break;
2287                         }
2288 #endif
2289                         if (chBest == NULL || ch->ch_LTime == 0 ||
2290                             ch->ch_LTime < chBest->ch_LTime) {
2291                                 chBest = ch;
2292                         }
2293                 }
2294                 if ((rss.ss_family == AF_INET &&
2295                      (chBest->ch_Family != AF_INET ||
2296                       sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2297                     chBest->ch_Service == NULL ||
2298                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2299                         chBest->ch_Family = sin4->sin_family;
2300                         chBest->ch_Addr4 = sin4->sin_addr;
2301                         if (chBest->ch_Service)
2302                                 free(chBest->ch_Service);
2303                         chBest->ch_Service = strdup(sep->se_service);
2304                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2305                 }
2306 #ifdef INET6
2307                 if ((rss.ss_family == AF_INET6 &&
2308                      (chBest->ch_Family != AF_INET6 ||
2309                       IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2310                                          &chBest->ch_Addr6) == 0)) ||
2311                     chBest->ch_Service == NULL ||
2312                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2313                         chBest->ch_Family = sin6->sin6_family;
2314                         chBest->ch_Addr6 = sin6->sin6_addr;
2315                         if (chBest->ch_Service)
2316                                 free(chBest->ch_Service);
2317                         chBest->ch_Service = strdup(sep->se_service);
2318                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2319                 }
2320 #endif
2321                 chBest->ch_LTime = t;
2322                 {
2323                         CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2324                         if (ct->ct_Ticks != ticks) {
2325                                 ct->ct_Ticks = ticks;
2326                                 ct->ct_Count = 0;
2327                         }
2328                         ++ct->ct_Count;
2329                 }
2330                 for (i = 0; i < CHTSIZE; ++i) {
2331                         CTime *ct = &chBest->ch_Times[i];
2332                         if (ct->ct_Ticks <= ticks &&
2333                             ct->ct_Ticks >= ticks - CHTSIZE) {
2334                                 cnt += ct->ct_Count;
2335                         }
2336                 }
2337                 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) {
2338                         char pname[NI_MAXHOST];
2339
2340                         getnameinfo((struct sockaddr *)&rss,
2341                                     ((struct sockaddr *)&rss)->sa_len,
2342                                     pname, sizeof(pname), NULL, 0,
2343                                     NI_NUMERICHOST);
2344                         r = -1;
2345                         syslog(LOG_ERR,
2346                             "%s from %s exceeded counts/min (limit %d/min)",
2347                             sep->se_service, pname,
2348                             sep->se_maxcpm);
2349                 }
2350         }
2351         return(r);
2352 }
2353
2354 static struct conninfo *
2355 search_conn(struct servtab *sep, int ctrl)
2356 {
2357         struct sockaddr_storage ss;
2358         socklen_t sslen = sizeof(ss);
2359         struct conninfo *conn;
2360         int hv;
2361         char pname[NI_MAXHOST],  pname2[NI_MAXHOST];
2362
2363         if (sep->se_maxperip <= 0)
2364                 return NULL;
2365
2366         /*
2367          * If getpeername() fails, just let it through (if logging is
2368          * enabled the condition is caught elsewhere)
2369          */
2370         if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2371                 return NULL;
2372
2373         switch (ss.ss_family) {
2374         case AF_INET:
2375                 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2376                     sizeof(struct in_addr));
2377                 break;
2378 #ifdef INET6
2379         case AF_INET6:
2380                 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2381                     sizeof(struct in6_addr));
2382                 break;
2383 #endif
2384         default:
2385                 /*
2386                  * Since we only support AF_INET and AF_INET6, just
2387                  * let other than AF_INET and AF_INET6 through.
2388                  */
2389                 return NULL;
2390         }
2391
2392         if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2393             NULL, 0, NI_NUMERICHOST) != 0)
2394                 return NULL;
2395
2396         LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2397                 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2398                     conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2399                     NI_NUMERICHOST) == 0 &&
2400                     strcmp(pname, pname2) == 0)
2401                         break;
2402         }
2403
2404         if (conn == NULL) {
2405                 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2406                         syslog(LOG_ERR, "malloc: %m");
2407                         exit(EX_OSERR);
2408                 }
2409                 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2410                 if (conn->co_proc == NULL) {
2411                         syslog(LOG_ERR, "malloc: %m");
2412                         exit(EX_OSERR);
2413                 }
2414                 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2415                 conn->co_numchild = 0;
2416                 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2417         }
2418
2419         /*
2420          * Since a child process is not invoked yet, we cannot
2421          * determine a pid of a child.  So, co_proc and co_numchild
2422          * should be filled leter.
2423          */
2424
2425         return conn;
2426 }
2427
2428 static int
2429 room_conn(struct servtab *sep, struct conninfo *conn)
2430 {
2431         char pname[NI_MAXHOST];
2432
2433         if (conn->co_numchild >= sep->se_maxperip) {
2434                 getnameinfo((struct sockaddr *)&conn->co_addr,
2435                     conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2436                     NI_NUMERICHOST);
2437                 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2438                     sep->se_service, pname, sep->se_maxperip);
2439                 return 0;
2440         }
2441         return 1;
2442 }
2443
2444 static void
2445 addchild_conn(struct conninfo *conn, pid_t pid)
2446 {
2447         struct procinfo *proc;
2448
2449         if (conn == NULL)
2450                 return;
2451
2452         if ((proc = search_proc(pid, 1)) != NULL) {
2453                 if (proc->pr_conn != NULL) {
2454                         syslog(LOG_ERR,
2455                             "addchild_conn: child already on process list");
2456                         exit(EX_OSERR);
2457                 }
2458                 proc->pr_conn = conn;
2459         }
2460
2461         conn->co_proc[conn->co_numchild++] = proc;
2462 }
2463
2464 static void
2465 reapchild_conn(pid_t pid)
2466 {
2467         struct procinfo *proc;
2468         struct conninfo *conn;
2469         int i;
2470
2471         if ((proc = search_proc(pid, 0)) == NULL)
2472                 return;
2473         if ((conn = proc->pr_conn) == NULL)
2474                 return;
2475         for (i = 0; i < conn->co_numchild; ++i)
2476                 if (conn->co_proc[i] == proc) {
2477                         conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2478                         break;
2479                 }
2480         free_proc(proc);
2481         free_conn(conn);
2482 }
2483
2484 static void
2485 resize_conn(struct servtab *sep, int maxpip)
2486 {
2487         struct conninfo *conn;
2488         int i, j;
2489
2490         if (sep->se_maxperip <= 0)
2491                 return;
2492         if (maxpip <= 0) {
2493                 free_connlist(sep);
2494                 return;
2495         }
2496         for (i = 0; i < PERIPSIZE; ++i) {
2497                 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2498                         for (j = maxpip; j < conn->co_numchild; ++j)
2499                                 free_proc(conn->co_proc[j]);
2500                         conn->co_proc = realloc(conn->co_proc,
2501                             maxpip * sizeof(*conn->co_proc));
2502                         if (conn->co_proc == NULL) {
2503                                 syslog(LOG_ERR, "realloc: %m");
2504                                 exit(EX_OSERR);
2505                         }
2506                         if (conn->co_numchild > maxpip)
2507                                 conn->co_numchild = maxpip;
2508                 }
2509         }
2510 }
2511
2512 static void
2513 free_connlist(struct servtab *sep)
2514 {
2515         struct conninfo *conn;
2516         int i, j;
2517
2518         for (i = 0; i < PERIPSIZE; ++i) {
2519                 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2520                         for (j = 0; j < conn->co_numchild; ++j)
2521                                 free_proc(conn->co_proc[j]);
2522                         conn->co_numchild = 0;
2523                         free_conn(conn);
2524                 }
2525         }
2526 }
2527
2528 static void
2529 free_conn(struct conninfo *conn)
2530 {
2531         if (conn == NULL)
2532                 return;
2533         if (conn->co_numchild <= 0) {
2534                 LIST_REMOVE(conn, co_link);
2535                 free(conn->co_proc);
2536                 free(conn);
2537         }
2538 }
2539
2540 static struct procinfo *
2541 search_proc(pid_t pid, int add)
2542 {
2543         struct procinfo *proc;
2544         int hv;
2545
2546         hv = hashval((char *)&pid, sizeof(pid));
2547         LIST_FOREACH(proc, &proctable[hv], pr_link) {
2548                 if (proc->pr_pid == pid)
2549                         break;
2550         }
2551         if (proc == NULL && add) {
2552                 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2553                         syslog(LOG_ERR, "malloc: %m");
2554                         exit(EX_OSERR);
2555                 }
2556                 proc->pr_pid = pid;
2557                 proc->pr_conn = NULL;
2558                 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2559         }
2560         return proc;
2561 }
2562
2563 static void
2564 free_proc(struct procinfo *proc)
2565 {
2566         if (proc == NULL)
2567                 return;
2568         LIST_REMOVE(proc, pr_link);
2569         free(proc);
2570 }
2571
2572 static int
2573 hashval(char *p, int len)
2574 {
2575         int i, hv = 0xABC3D20F;
2576
2577         for (i = 0; i < len; ++i, ++p)
2578                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2579         hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2580         return hv;
2581 }