usr.sbin/inetd/inetd.c

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