usr.sbin/inetd/inetd.c

   1 /*
   2  * Copyright (c) 1983, 1991, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)from: inetd.c       8.4 (Berkeley) 4/13/94";
  43 #endif
  44 #endif /* not lint */
  45
  46 #include <sys/cdefs.h>
  47 __FBSDID("$FreeBSD$");
  48
  49 /*
  50  * Inetd - Internet super-server
  51  *
  52  * This program invokes all internet services as needed.  Connection-oriented
  53  * services are invoked each time a connection is made, by creating a process.
  54  * This process is passed the connection as file descriptor 0 and is expected
  55  * to do a getpeername to find out the source host and port.
  56  *
  57  * Datagram oriented services are invoked when a datagram
  58  * arrives; a process is created and passed a pending message
  59  * on file descriptor 0.  Datagram servers may either connect
  60  * to their peer, freeing up the original socket for inetd
  61  * to receive further messages on, or ``take over the socket'',
  62  * processing all arriving datagrams and, eventually, timing
  63  * out.  The first type of server is said to be ``multi-threaded'';
  64  * the second type of server ``single-threaded''.
  65  *
  66  * Inetd uses a configuration file which is read at startup
  67  * and, possibly, at some later time in response to a hangup signal.
  68  * The configuration file is ``free format'' with fields given in the
  69  * order shown below.  Continuation lines for an entry must begin with
  70  * a space or tab.  All fields must be present in each entry.
  71  *
  72  *      service name                    must be in /etc/services
  73  *                                      or name a tcpmux service
  74  *                                      or specify a unix domain socket
  75  *      socket type                     stream/dgram/raw/rdm/seqpacket
  76  *      protocol                        tcp[4][6][/faith,ttcp], udp[4][6], unix
  77  *      wait/nowait                     single-threaded/multi-threaded
  78  *      user                            user to run daemon as
  79  *      server program                  full path name
  80  *      server program arguments        maximum of MAXARGS (20)
  81  *
  82  * TCP services without official port numbers are handled with the
  83  * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
  84  * requests. When a connection is made from a foreign host, the service
  85  * requested is passed to tcpmux, which looks it up in the servtab list
  86  * and returns the proper entry for the service. Tcpmux returns a
  87  * negative reply if the service doesn't exist, otherwise the invoked
  88  * server is expected to return the positive reply if the service type in
  89  * inetd.conf file has the prefix "tcpmux/". If the service type has the
  90  * prefix "tcpmux/+", tcpmux will return the positive reply for the
  91  * process; this is for compatibility with older server code, and also
  92  * allows you to invoke programs that use stdin/stdout without putting any
  93  * special server code in them. Services that use tcpmux are "nowait"
  94  * because they do not have a well-known port and hence cannot listen
  95  * for new requests.
  96  *
  97  * For RPC services
  98  *      service name/version            must be in /etc/rpc
  99  *      socket type                     stream/dgram/raw/rdm/seqpacket
 100  *      protocol                        rpc/tcp[4][6], rpc/udp[4][6]
 101  *      wait/nowait                     single-threaded/multi-threaded
 102  *      user                            user to run daemon as
 103  *      server program                  full path name
 104  *      server program arguments        maximum of MAXARGS
 105  *
 106  * Comment lines are indicated by a `#' in column 1.
 107  *
 108  * #ifdef IPSEC
 109  * Comment lines that start with "#@" denote IPsec policy string, as described
 110  * in ipsec_set_policy(3).  This will affect all the following items in
 111  * inetd.conf(8).  To reset the policy, just use "#@" line.  By default,
 112  * there's no IPsec policy.
 113  * #endif
 114  */
 115 #include <sys/param.h>
 116 #include <sys/ioctl.h>
 117 #include <sys/wait.h>
 118 #include <sys/time.h>
 119 #include <sys/resource.h>
 120 #include <sys/stat.h>
 121 #include <sys/un.h>
 122
 123 #include <netinet/in.h>
 124 #include <netinet/tcp.h>
 125 #include <arpa/inet.h>
 126 #include <rpc/rpc.h>
 127 #include <rpc/pmap_clnt.h>
 128
 129 #include <errno.h>
 130 #include <err.h>
 131 #include <fcntl.h>
 132 #include <grp.h>
 133 #include <netdb.h>
 134 #include <pwd.h>
 135 #include <signal.h>
 136 #include <stdio.h>
 137 #include <stdlib.h>
 138 #include <string.h>
 139 #include <syslog.h>
 140 #include <tcpd.h>
 141 #include <unistd.h>
 142 #include <libutil.h>
 143 #include <sysexits.h>
 144 #include <ctype.h>
 145
 146 #include "inetd.h"
 147 #include "pathnames.h"
 148
 149 #ifdef IPSEC
 150 #include <netinet6/ipsec.h>
 151 #ifndef IPSEC_POLICY_IPSEC      /* no ipsec support on old ipsec */
 152 #undef IPSEC
 153 #endif
 154 #endif
 155
 156 /* wrapper for KAME-special getnameinfo() */
 157 #ifndef NI_WITHSCOPEID
 158 #define NI_WITHSCOPEID  0
 159 #endif
 160
 161 #ifndef LIBWRAP_ALLOW_FACILITY
 162 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
 163 #endif
 164 #ifndef LIBWRAP_ALLOW_SEVERITY
 165 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
 166 #endif
 167 #ifndef LIBWRAP_DENY_FACILITY
 168 # define LIBWRAP_DENY_FACILITY LOG_AUTH
 169 #endif
 170 #ifndef LIBWRAP_DENY_SEVERITY
 171 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
 172 #endif
 173
 174 #define ISWRAP(sep)     \
 175            ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
 176         && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
 177         && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
 178             || (sep)->se_socktype == SOCK_DGRAM))
 179
 180 #ifdef LOGIN_CAP
 181 #include <login_cap.h>
 182
 183 /* see init.c */
 184 #define RESOURCE_RC "daemon"
 185
 186 #endif
 187
 188 #ifndef MAXCHILD
 189 #define MAXCHILD        -1              /* maximum number of this service
 190                                            < 0 = no limit */
 191 #endif
 192
 193 #ifndef MAXCPM
 194 #define MAXCPM          -1              /* rate limit invocations from a
 195                                            single remote address,
 196                                            < 0 = no limit */
 197 #endif
 198
 199 #ifndef MAXPERIP
 200 #define MAXPERIP        -1              /* maximum number of this service
 201                                            from a single remote address,
 202                                            < 0 = no limit */
 203 #endif
 204
 205 #ifndef TOOMANY
 206 #define TOOMANY         256             /* don't start more than TOOMANY */
 207 #endif
 208 #define CNT_INTVL       60              /* servers in CNT_INTVL sec. */
 209 #define RETRYTIME       (60*10)         /* retry after bind or server fail */
 210 #define MAX_MAXCHLD     32767           /* max allowable max children */
 211
 212 #define SIGBLOCK        (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
 213
 214 void            close_sep(struct servtab *);
 215 void            flag_signal(int);
 216 void            flag_config(int);
 217 void            config(void);
 218 int             cpmip(const struct servtab *, int);
 219 void            endconfig(void);
 220 struct servtab *enter(struct servtab *);
 221 void            freeconfig(struct servtab *);
 222 struct servtab *getconfigent(void);
 223 int             matchservent(const char *, const char *, const char *);
 224 char           *nextline(FILE *);
 225 void            addchild(struct servtab *, int);
 226 void            flag_reapchild(int);
 227 void            reapchild(void);
 228 void            enable(struct servtab *);
 229 void            disable(struct servtab *);
 230 void            flag_retry(int);
 231 void            retry(void);
 232 int             setconfig(void);
 233 void            setup(struct servtab *);
 234 #ifdef IPSEC
 235 void            ipsecsetup(struct servtab *);
 236 #endif
 237 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
 249 int     allow_severity;
 250 int     deny_severity;
 251 int     wrap_ex = 0;
 252 int     wrap_bi = 0;
 253 int     debug = 0;
 254 int     log = 0;
 255 int     maxsock;                        /* highest-numbered descriptor */
 256 fd_set  allsock;
 257 int     options;
 258 int     timingout;
 259 int     toomany = TOOMANY;
 260 int     maxchild = MAXCHILD;
 261 int     maxcpm = MAXCPM;
 262 int     maxperip = MAXPERIP;
 263 struct  servent *sp;
 264 struct  rpcent *rpc;
 265 char    *hostname = NULL;
 266 struct  sockaddr_in *bind_sa4;
 267 int     no_v4bind = 1;
 268 #ifdef INET6
 269 struct  sockaddr_in6 *bind_sa6;
 270 int     no_v6bind = 1;
 271 #endif
 272 int     signalpipe[2];
 273 #ifdef SANITY_CHECK
 274 int     nsock;
 275 #endif
 276 uid_t   euid;
 277 gid_t   egid;
 278 mode_t  mask;
 279
 280 struct  servtab *servtab;
 281
 282 extern struct biltin biltins[];
 283
 284 const char      *CONFIG = _PATH_INETDCONF;
 285 const char      *pid_file = _PATH_INETDPID;
 286
 287 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
 288
 289 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
 290
 291 int
 292 getvalue(const char *arg, int *value, const char *whine)
 293 {
 294         int  tmp;
 295         char *p;
 296
 297         tmp = strtol(arg, &p, 0);
 298         if (tmp < 0 || *p) {
 299                 syslog(LOG_ERR, whine, arg);
 300                 return 1;                       /* failure */
 301         }
 302         *value = tmp;
 303         return 0;                               /* success */
 304 }
 305
 306 int
 307 main(int argc, char **argv)
 308 {
 309         struct servtab *sep;
 310         struct passwd *pwd;
 311         struct group *grp;
 312         struct sigaction sa, saalrm, sachld, sahup, sapipe;
 313         int tmpint, ch, dofork;
 314         pid_t pid;
 315         char buf[50];
 316 #ifdef LOGIN_CAP
 317         login_cap_t *lc = NULL;
 318 #endif
 319         struct request_info req;
 320         int denied;
 321         char *service = NULL;
 322         union {
 323                 struct sockaddr peer_un;
 324                 struct sockaddr_in peer_un4;
 325                 struct sockaddr_in6 peer_un6;
 326                 struct sockaddr_storage peer_max;
 327         } p_un;
 328 #define peer    p_un.peer_un
 329 #define peer4   p_un.peer_un4
 330 #define peer6   p_un.peer_un6
 331 #define peermax p_un.peer_max
 332         int i;
 333         struct addrinfo hints, *res;
 334         const char *servname;
 335         int error;
 336         struct conninfo *conn;
 337
 338         openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
 339
 340         while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
 341                 switch(ch) {
 342                 case 'd':
 343                         debug = 1;
 344                         options |= SO_DEBUG;
 345                         break;
 346                 case 'l':
 347                         log = 1;
 348                         break;
 349                 case 'R':
 350                         getvalue(optarg, &toomany,
 351                                 "-R %s: bad value for service invocation rate");
 352                         break;
 353                 case 'c':
 354                         getvalue(optarg, &maxchild,
 355                                 "-c %s: bad value for maximum children");
 356                         break;
 357                 case 'C':
 358                         getvalue(optarg, &maxcpm,
 359                                 "-C %s: bad value for maximum children/minute");
 360                         break;
 361                 case 'a':
 362                         hostname = optarg;
 363                         break;
 364                 case 'p':
 365                         pid_file = optarg;
 366                         break;
 367                 case 's':
 368                         getvalue(optarg, &maxperip,
 369                                 "-s %s: bad value for maximum children per source address");
 370                         break;
 371                 case 'w':
 372                         wrap_ex++;
 373                         break;
 374                 case 'W':
 375                         wrap_bi++;
 376                         break;
 377                 case '?':
 378                 default:
 379                         syslog(LOG_ERR,
 380                                 "usage: inetd [-dlwW] [-a address] [-R rate]"
 381                                 " [-c maximum] [-C rate]"
 382                                 " [-p pidfile] [conf-file]");
 383                         exit(EX_USAGE);
 384                 }
 385         /*
 386          * Initialize Bind Addrs.
 387          *   When hostname is NULL, wild card bind addrs are obtained from
 388          *   getaddrinfo(). But getaddrinfo() requires at least one of
 389          *   hostname or servname is non NULL.
 390          *   So when hostname is NULL, set dummy value to servname.
 391          */
 392         servname = (hostname == NULL) ? "discard" /* dummy */ : NULL;
 393
 394         bzero(&hints, sizeof(struct addrinfo));
 395         hints.ai_flags = AI_PASSIVE;
 396         hints.ai_family = AF_UNSPEC;
 397         error = getaddrinfo(hostname, servname, &hints, &res);
 398         if (error != 0) {
 399                 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
 400                 if (error == EAI_SYSTEM)
 401                         syslog(LOG_ERR, "%s", strerror(errno));
 402                 exit(EX_USAGE);
 403         }
 404         do {
 405                 if (res->ai_addr == NULL) {
 406                         syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
 407                         exit(EX_USAGE);
 408                 }
 409                 switch (res->ai_addr->sa_family) {
 410                 case AF_INET:
 411                         if (no_v4bind == 0)
 412                                 continue;
 413                         bind_sa4 = (struct sockaddr_in *)res->ai_addr;
 414                         /* init port num in case servname is dummy */
 415                         bind_sa4->sin_port = 0;
 416                         no_v4bind = 0;
 417                         continue;
 418 #ifdef INET6
 419                 case AF_INET6:
 420                         if (no_v6bind == 0)
 421                                 continue;
 422                         bind_sa6 = (struct sockaddr_in6 *)res->ai_addr;
 423                         /* init port num in case servname is dummy */
 424                         bind_sa6->sin6_port = 0;
 425                         no_v6bind = 0;
 426                         continue;
 427 #endif
 428                 }
 429                 if (no_v4bind == 0
 430 #ifdef INET6
 431                     && no_v6bind == 0
 432 #endif
 433                     )
 434                         break;
 435         } while ((res = res->ai_next) != NULL);
 436         if (no_v4bind != 0
 437 #ifdef INET6
 438             && no_v6bind != 0
 439 #endif
 440             ) {
 441                 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
 442                 exit(EX_USAGE);
 443         }
 444
 445         euid = geteuid();
 446         egid = getegid();
 447         umask(mask = umask(0777));
 448
 449         argc -= optind;
 450         argv += optind;
 451
 452         if (argc > 0)
 453                 CONFIG = argv[0];
 454         if (debug == 0) {
 455                 FILE *fp;
 456                 if (daemon(0, 0) < 0) {
 457                         syslog(LOG_WARNING, "daemon(0,0) failed: %m");
 458                 }
 459                 /* From now on we don't want syslog messages going to stderr. */
 460                 closelog();
 461                 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
 462                 /*
 463                  * In case somebody has started inetd manually, we need to
 464                  * clear the logname, so that old servers run as root do not
 465                  * get the user's logname..
 466                  */
 467                 if (setlogin("") < 0) {
 468                         syslog(LOG_WARNING, "cannot clear logname: %m");
 469                         /* no big deal if it fails.. */
 470                 }
 471                 pid = getpid();
 472                 fp = fopen(pid_file, "w");
 473                 if (fp) {
 474                         fprintf(fp, "%ld\n", (long)pid);
 475                         fclose(fp);
 476                 } else {
 477                         syslog(LOG_WARNING, "%s: %m", pid_file);
 478                 }
 479         }
 480
 481         for (i = 0; i < PERIPSIZE; ++i)
 482                 LIST_INIT(&proctable[i]);
 483
 484         if (!no_v4bind) {
 485                 udpconf = getnetconfigent("udp");
 486                 tcpconf = getnetconfigent("tcp");
 487                 if (udpconf == NULL || tcpconf == NULL) {
 488                         syslog(LOG_ERR, "unknown rpc/udp or rpc/tpc");
 489                         exit(EX_USAGE);
 490                 }
 491         }
 492 #ifdef INET6
 493         if (!no_v6bind) {
 494                 udp6conf = getnetconfigent("udp6");
 495                 tcp6conf = getnetconfigent("tcp6");
 496                 if (udp6conf == NULL || tcp6conf == NULL) {
 497                         syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tpc6");
 498                         exit(EX_USAGE);
 499                 }
 500         }
 501 #endif
 502
 503         sa.sa_flags = 0;
 504         sigemptyset(&sa.sa_mask);
 505         sigaddset(&sa.sa_mask, SIGALRM);
 506         sigaddset(&sa.sa_mask, SIGCHLD);
 507         sigaddset(&sa.sa_mask, SIGHUP);
 508         sa.sa_handler = flag_retry;
 509         sigaction(SIGALRM, &sa, &saalrm);
 510         config();
 511         sa.sa_handler = flag_config;
 512         sigaction(SIGHUP, &sa, &sahup);
 513         sa.sa_handler = flag_reapchild;
 514         sigaction(SIGCHLD, &sa, &sachld);
 515         sa.sa_handler = SIG_IGN;
 516         sigaction(SIGPIPE, &sa, &sapipe);
 517
 518         {
 519                 /* space for daemons to overwrite environment for ps */
 520 #define DUMMYSIZE       100
 521                 char dummy[DUMMYSIZE];
 522
 523                 (void)memset(dummy, 'x', DUMMYSIZE - 1);
 524                 dummy[DUMMYSIZE - 1] = '\0';
 525                 (void)setenv("inetd_dummy", dummy, 1);
 526         }
 527
 528         if (pipe(signalpipe) != 0) {
 529                 syslog(LOG_ERR, "pipe: %m");
 530                 exit(EX_OSERR);
 531         }
 532         FD_SET(signalpipe[0], &allsock);
 533 #ifdef SANITY_CHECK
 534         nsock++;
 535 #endif
 536         if (signalpipe[0] > maxsock)
 537             maxsock = signalpipe[0];
 538         if (signalpipe[1] > maxsock)
 539             maxsock = signalpipe[1];
 540
 541         for (;;) {
 542             int n, ctrl;
 543             fd_set readable;
 544
 545 #ifdef SANITY_CHECK
 546             if (nsock == 0) {
 547                 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__);
 548                 exit(EX_SOFTWARE);
 549             }
 550 #endif
 551             readable = allsock;
 552             if ((n = select(maxsock + 1, &readable, (fd_set *)0,
 553                 (fd_set *)0, (struct timeval *)0)) <= 0) {
 554                     if (n < 0 && errno != EINTR) {
 555                         syslog(LOG_WARNING, "select: %m");
 556                         sleep(1);
 557                     }
 558                     continue;
 559             }
 560             /* handle any queued signal flags */
 561             if (FD_ISSET(signalpipe[0], &readable)) {
 562                 int nsig;
 563                 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
 564                     syslog(LOG_ERR, "ioctl: %m");
 565                     exit(EX_OSERR);
 566                 }
 567                 while (--nsig >= 0) {
 568                     char c;
 569                     if (read(signalpipe[0], &c, 1) != 1) {
 570                         syslog(LOG_ERR, "read: %m");
 571                         exit(EX_OSERR);
 572                     }
 573                     if (debug)
 574                         warnx("handling signal flag %c", c);
 575                     switch(c) {
 576                     case 'A': /* sigalrm */
 577                         retry();
 578                         break;
 579                     case 'C': /* sigchld */
 580                         reapchild();
 581                         break;
 582                     case 'H': /* sighup */
 583                         config();
 584                         break;
 585                     }
 586                 }
 587             }
 588             for (sep = servtab; n && sep; sep = sep->se_next)
 589                 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
 590                     n--;
 591                     if (debug)
 592                             warnx("someone wants %s", sep->se_service);
 593                     dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
 594                     conn = NULL;
 595                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
 596                             i = 1;
 597                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 598                                     syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
 599                             ctrl = accept(sep->se_fd, (struct sockaddr *)0,
 600                                 (socklen_t *)0);
 601                             if (debug)
 602                                     warnx("accept, ctrl %d", ctrl);
 603                             if (ctrl < 0) {
 604                                     if (errno != EINTR)
 605                                             syslog(LOG_WARNING,
 606                                                 "accept (for %s): %m",
 607                                                 sep->se_service);
 608                                       if (sep->se_accept &&
 609                                           sep->se_socktype == SOCK_STREAM)
 610                                               close(ctrl);
 611                                     continue;
 612                             }
 613                             i = 0;
 614                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 615                                     syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
 616                             if (ioctl(ctrl, FIONBIO, &i) < 0)
 617                                     syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
 618                             if (cpmip(sep, ctrl) < 0) {
 619                                 close(ctrl);
 620                                 continue;
 621                             }
 622                             if (dofork &&
 623                                 (conn = search_conn(sep, ctrl)) != NULL &&
 624                                 !room_conn(sep, conn)) {
 625                                 close(ctrl);
 626                                 continue;
 627                             }
 628                     } else
 629                             ctrl = sep->se_fd;
 630                     if (log && !ISWRAP(sep)) {
 631                             char pname[INET6_ADDRSTRLEN] = "unknown";
 632                             socklen_t sl;
 633                             sl = sizeof peermax;
 634                             if (getpeername(ctrl, (struct sockaddr *)
 635                                             &peermax, &sl)) {
 636                                     sl = sizeof peermax;
 637                                     if (recvfrom(ctrl, buf, sizeof(buf),
 638                                         MSG_PEEK,
 639                                         (struct sockaddr *)&peermax,
 640                                         &sl) >= 0) {
 641                                       getnameinfo((struct sockaddr *)&peermax,
 642                                                   peer.sa_len,
 643                                                   pname, sizeof(pname),
 644                                                   NULL, 0,
 645                                                   NI_NUMERICHOST|
 646                                                   NI_WITHSCOPEID);
 647                                     }
 648                             } else {
 649                                     getnameinfo((struct sockaddr *)&peermax,
 650                                                 peer.sa_len,
 651                                                 pname, sizeof(pname),
 652                                                 NULL, 0,
 653                                                 NI_NUMERICHOST|
 654                                                 NI_WITHSCOPEID);
 655                             }
 656                             syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
 657                     }
 658                     (void) sigblock(SIGBLOCK);
 659                     pid = 0;
 660                     /*
 661                      * Fork for all external services, builtins which need to
 662                      * fork and anything we're wrapping (as wrapping might
 663                      * block or use hosts_options(5) twist).
 664                      */
 665                     if (dofork) {
 666                             if (sep->se_count++ == 0)
 667                                 (void)gettimeofday(&sep->se_time, (struct timezone *)NULL);
 668                             else if (toomany > 0 && sep->se_count >= toomany) {
 669                                 struct timeval now;
 670
 671                                 (void)gettimeofday(&now, (struct timezone *)NULL);
 672                                 if (now.tv_sec - sep->se_time.tv_sec >
 673                                     CNT_INTVL) {
 674                                         sep->se_time = now;
 675                                         sep->se_count = 1;
 676                                 } else {
 677                                         syslog(LOG_ERR,
 678                         "%s/%s server failing (looping), service terminated",
 679                                             sep->se_service, sep->se_proto);
 680                                         if (sep->se_accept &&
 681                                             sep->se_socktype == SOCK_STREAM)
 682                                                 close(ctrl);
 683                                         close_sep(sep);
 684                                         free_conn(conn);
 685                                         sigsetmask(0L);
 686                                         if (!timingout) {
 687                                                 timingout = 1;
 688                                                 alarm(RETRYTIME);
 689                                         }
 690                                         continue;
 691                                 }
 692                             }
 693                             pid = fork();
 694                     }
 695                     if (pid < 0) {
 696                             syslog(LOG_ERR, "fork: %m");
 697                             if (sep->se_accept &&
 698                                 sep->se_socktype == SOCK_STREAM)
 699                                     close(ctrl);
 700                             free_conn(conn);
 701                             sigsetmask(0L);
 702                             sleep(1);
 703                             continue;
 704                     }
 705                     if (pid) {
 706                         addchild_conn(conn, pid);
 707                         addchild(sep, pid);
 708                     }
 709                     sigsetmask(0L);
 710                     if (pid == 0) {
 711                             if (dofork) {
 712                                 if (debug)
 713                                         warnx("+ closing from %d", maxsock);
 714                                 for (tmpint = maxsock; tmpint > 2; tmpint--)
 715                                         if (tmpint != ctrl)
 716                                                 (void) close(tmpint);
 717                                 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
 718                                 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
 719                                 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
 720                                 /* SIGPIPE reset before exec */
 721                             }
 722                             /*
 723                              * Call tcpmux to find the real service to exec.
 724                              */
 725                             if (sep->se_bi &&
 726                                 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
 727                                     sep = tcpmux(ctrl);
 728                                     if (sep == NULL) {
 729                                             close(ctrl);
 730                                             _exit(0);
 731                                     }
 732                             }
 733                             if (ISWRAP(sep)) {
 734                                 inetd_setproctitle("wrapping", ctrl);
 735                                 service = sep->se_server_name ?
 736                                     sep->se_server_name : sep->se_service;
 737                                 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL);
 738                                 fromhost(&req);
 739                                 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
 740                                 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
 741                                 denied = !hosts_access(&req);
 742                                 if (denied) {
 743                                     syslog(deny_severity,
 744                                         "refused connection from %.500s, service %s (%s%s)",
 745                                         eval_client(&req), service, sep->se_proto,
 746                                         (((struct sockaddr *)req.client->sin)->sa_family == AF_INET6 && !IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)req.client->sin)->sin6_addr)) ? "6" : "");
 747                                     if (sep->se_socktype != SOCK_STREAM)
 748                                         recv(ctrl, buf, sizeof (buf), 0);
 749                                     if (dofork) {
 750                                         sleep(1);
 751                                         _exit(0);
 752                                     }
 753                                 }
 754                                 if (log) {
 755                                     syslog(allow_severity,
 756                                         "connection from %.500s, service %s (%s%s)",
 757                                         eval_client(&req), service, sep->se_proto,
 758                                         (((struct sockaddr *)req.client->sin)->sa_family == AF_INET6 && !IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)req.client->sin)->sin6_addr)) ? "6" : "");
 759                                 }
 760                             }
 761                             if (sep->se_bi) {
 762                                 (*sep->se_bi->bi_fn)(ctrl, sep);
 763                             } else {
 764                                 if (debug)
 765                                         warnx("%d execl %s",
 766                                                 getpid(), sep->se_server);
 767                                 dup2(ctrl, 0);
 768                                 close(ctrl);
 769                                 dup2(0, 1);
 770                                 dup2(0, 2);
 771                                 if ((pwd = getpwnam(sep->se_user)) == NULL) {
 772                                         syslog(LOG_ERR,
 773                                             "%s/%s: %s: no such user",
 774                                                 sep->se_service, sep->se_proto,
 775                                                 sep->se_user);
 776                                         if (sep->se_socktype != SOCK_STREAM)
 777                                                 recv(0, buf, sizeof (buf), 0);
 778                                         _exit(EX_NOUSER);
 779                                 }
 780                                 grp = NULL;
 781                                 if (   sep->se_group != NULL
 782                                     && (grp = getgrnam(sep->se_group)) == NULL
 783                                    ) {
 784                                         syslog(LOG_ERR,
 785                                             "%s/%s: %s: no such group",
 786                                                 sep->se_service, sep->se_proto,
 787                                                 sep->se_group);
 788                                         if (sep->se_socktype != SOCK_STREAM)
 789                                                 recv(0, buf, sizeof (buf), 0);
 790                                         _exit(EX_NOUSER);
 791                                 }
 792                                 if (grp != NULL)
 793                                         pwd->pw_gid = grp->gr_gid;
 794 #ifdef LOGIN_CAP
 795                                 if ((lc = login_getclass(sep->se_class)) == NULL) {
 796                                         /* error syslogged by getclass */
 797                                         syslog(LOG_ERR,
 798                                             "%s/%s: %s: login class error",
 799                                                 sep->se_service, sep->se_proto,
 800                                                 sep->se_class);
 801                                         if (sep->se_socktype != SOCK_STREAM)
 802                                                 recv(0, buf, sizeof (buf), 0);
 803                                         _exit(EX_NOUSER);
 804                                 }
 805 #endif
 806                                 if (setsid() < 0) {
 807                                         syslog(LOG_ERR,
 808                                                 "%s: can't setsid(): %m",
 809                                                  sep->se_service);
 810                                         /* _exit(EX_OSERR); not fatal yet */
 811                                 }
 812 #ifdef LOGIN_CAP
 813                                 if (setusercontext(lc, pwd, pwd->pw_uid,
 814                                     LOGIN_SETALL) != 0) {
 815                                         syslog(LOG_ERR,
 816                                          "%s: can't setusercontext(..%s..): %m",
 817                                          sep->se_service, sep->se_user);
 818                                         _exit(EX_OSERR);
 819                                 }
 820 #else
 821                                 if (pwd->pw_uid) {
 822                                         if (setlogin(sep->se_user) < 0) {
 823                                                 syslog(LOG_ERR,
 824                                                  "%s: can't setlogin(%s): %m",
 825                                                  sep->se_service, sep->se_user);
 826                                                 /* _exit(EX_OSERR); not yet */
 827                                         }
 828                                         if (setgid(pwd->pw_gid) < 0) {
 829                                                 syslog(LOG_ERR,
 830                                                   "%s: can't set gid %d: %m",
 831                                                   sep->se_service, pwd->pw_gid);
 832                                                 _exit(EX_OSERR);
 833                                         }
 834                                         (void) initgroups(pwd->pw_name,
 835                                                         pwd->pw_gid);
 836                                         if (setuid(pwd->pw_uid) < 0) {
 837                                                 syslog(LOG_ERR,
 838                                                   "%s: can't set uid %d: %m",
 839                                                   sep->se_service, pwd->pw_uid);
 840                                                 _exit(EX_OSERR);
 841                                         }
 842                                 }
 843 #endif
 844                                 sigaction(SIGPIPE, &sapipe,
 845                                     (struct sigaction *)0);
 846                                 execv(sep->se_server, sep->se_argv);
 847                                 syslog(LOG_ERR,
 848                                     "cannot execute %s: %m", sep->se_server);
 849                                 if (sep->se_socktype != SOCK_STREAM)
 850                                         recv(0, buf, sizeof (buf), 0);
 851                             }
 852                             if (dofork)
 853                                 _exit(0);
 854                     }
 855                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
 856                             close(ctrl);
 857                 }
 858         }
 859 }
 860
 861 /*
 862  * Add a signal flag to the signal flag queue for later handling
 863  */
 864
 865 void
 866 flag_signal(int c)
 867 {
 868         char ch = c;
 869
 870         if (write(signalpipe[1], &ch, 1) != 1) {
 871                 syslog(LOG_ERR, "write: %m");
 872                 _exit(EX_OSERR);
 873         }
 874 }
 875
 876 /*
 877  * Record a new child pid for this service. If we've reached the
 878  * limit on children, then stop accepting incoming requests.
 879  */
 880
 881 void
 882 addchild(struct servtab *sep, pid_t pid)
 883 {
 884         if (sep->se_maxchild <= 0)
 885                 return;
 886 #ifdef SANITY_CHECK
 887         if (sep->se_numchild >= sep->se_maxchild) {
 888                 syslog(LOG_ERR, "%s: %d >= %d",
 889                     __FUNCTION__, sep->se_numchild, sep->se_maxchild);
 890                 exit(EX_SOFTWARE);
 891         }
 892 #endif
 893         sep->se_pids[sep->se_numchild++] = pid;
 894         if (sep->se_numchild == sep->se_maxchild)
 895                 disable(sep);
 896 }
 897
 898 /*
 899  * Some child process has exited. See if it's on somebody's list.
 900  */
 901
 902 void
 903 flag_reapchild(int signo __unused)
 904 {
 905         flag_signal('C');
 906 }
 907
 908 void
 909 reapchild(void)
 910 {
 911         int k, status;
 912         pid_t pid;
 913         struct servtab *sep;
 914
 915         for (;;) {
 916                 pid = wait3(&status, WNOHANG, (struct rusage *)0);
 917                 if (pid <= 0)
 918                         break;
 919                 if (debug)
 920                         warnx("%d reaped, status %#x", pid, status);
 921                 for (sep = servtab; sep; sep = sep->se_next) {
 922                         for (k = 0; k < sep->se_numchild; k++)
 923                                 if (sep->se_pids[k] == pid)
 924                                         break;
 925                         if (k == sep->se_numchild)
 926                                 continue;
 927                         if (sep->se_numchild == sep->se_maxchild)
 928                                 enable(sep);
 929                         sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
 930                         if (status)
 931                                 syslog(LOG_WARNING,
 932                                     "%s[%d]: exit status 0x%x",
 933                                     sep->se_server, pid, status);
 934                         break;
 935                 }
 936                 reapchild_conn(pid);
 937         }
 938 }
 939
 940 void
 941 flag_config(int signo __unused)
 942 {
 943         flag_signal('H');
 944 }
 945
 946 void
 947 config(void)
 948 {
 949         struct servtab *sep, *new, **sepp;
 950         struct conninfo *conn;
 951         long omask;
 952         int new_nomapped;
 953
 954         if (!setconfig()) {
 955                 syslog(LOG_ERR, "%s: %m", CONFIG);
 956                 return;
 957         }
 958         for (sep = servtab; sep; sep = sep->se_next)
 959                 sep->se_checked = 0;
 960         while ((new = getconfigent())) {
 961                 if (getpwnam(new->se_user) == NULL) {
 962                         syslog(LOG_ERR,
 963                                 "%s/%s: no such user '%s', service ignored",
 964                                 new->se_service, new->se_proto, new->se_user);
 965                         continue;
 966                 }
 967                 if (new->se_group && getgrnam(new->se_group) == NULL) {
 968                         syslog(LOG_ERR,
 969                                 "%s/%s: no such group '%s', service ignored",
 970                                 new->se_service, new->se_proto, new->se_group);
 971                         continue;
 972                 }
 973 #ifdef LOGIN_CAP
 974                 if (login_getclass(new->se_class) == NULL) {
 975                         /* error syslogged by getclass */
 976                         syslog(LOG_ERR,
 977                                 "%s/%s: %s: login class error, service ignored",
 978                                 new->se_service, new->se_proto, new->se_class);
 979                         continue;
 980                 }
 981 #endif
 982                 new_nomapped = new->se_nomapped;
 983                 for (sep = servtab; sep; sep = sep->se_next)
 984                         if (strcmp(sep->se_service, new->se_service) == 0 &&
 985                             strcmp(sep->se_proto, new->se_proto) == 0 &&
 986                             sep->se_rpc == new->se_rpc &&
 987                             sep->se_socktype == new->se_socktype &&
 988                             sep->se_family == new->se_family)
 989                                 break;
 990                 if (sep != 0) {
 991                         int i;
 992
 993 #define SWAP(t,a, b) { t c = a; a = b; b = c; }
 994                         omask = sigblock(SIGBLOCK);
 995                         if (sep->se_nomapped != new->se_nomapped) {
 996                                 /* for rpc keep old nommaped till unregister */
 997                                 if (!sep->se_rpc)
 998                                         sep->se_nomapped = new->se_nomapped;
 999                                 sep->se_reset = 1;
1000                         }
1001                         /* copy over outstanding child pids */
1002                         if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
1003                                 new->se_numchild = sep->se_numchild;
1004                                 if (new->se_numchild > new->se_maxchild)
1005                                         new->se_numchild = new->se_maxchild;
1006                                 memcpy(new->se_pids, sep->se_pids,
1007                                     new->se_numchild * sizeof(*new->se_pids));
1008                         }
1009                         SWAP(pid_t *, sep->se_pids, new->se_pids);
1010                         sep->se_maxchild = new->se_maxchild;
1011                         sep->se_numchild = new->se_numchild;
1012                         sep->se_maxcpm = new->se_maxcpm;
1013                         resize_conn(sep, new->se_maxperip);
1014                         sep->se_maxperip = new->se_maxperip;
1015                         sep->se_bi = new->se_bi;
1016                         /* might need to turn on or off service now */
1017                         if (sep->se_fd >= 0) {
1018                               if (sep->se_maxchild > 0
1019                                   && sep->se_numchild == sep->se_maxchild) {
1020                                       if (FD_ISSET(sep->se_fd, &allsock))
1021                                           disable(sep);
1022                               } else {
1023                                       if (!FD_ISSET(sep->se_fd, &allsock))
1024                                           enable(sep);
1025                               }
1026                         }
1027                         sep->se_accept = new->se_accept;
1028                         SWAP(char *, sep->se_user, new->se_user);
1029                         SWAP(char *, sep->se_group, new->se_group);
1030 #ifdef LOGIN_CAP
1031                         SWAP(char *, sep->se_class, new->se_class);
1032 #endif
1033                         SWAP(char *, sep->se_server, new->se_server);
1034                         SWAP(char *, sep->se_server_name, new->se_server_name);
1035                         for (i = 0; i < MAXARGV; i++)
1036                                 SWAP(char *, sep->se_argv[i], new->se_argv[i]);
1037 #ifdef IPSEC
1038                         SWAP(char *, sep->se_policy, new->se_policy);
1039                         ipsecsetup(sep);
1040 #endif
1041                         sigsetmask(omask);
1042                         freeconfig(new);
1043                         if (debug)
1044                                 print_service("REDO", sep);
1045                 } else {
1046                         sep = enter(new);
1047                         if (debug)
1048                                 print_service("ADD ", sep);
1049                 }
1050                 sep->se_checked = 1;
1051                 if (ISMUX(sep)) {
1052                         sep->se_fd = -1;
1053                         continue;
1054                 }
1055                 switch (sep->se_family) {
1056                 case AF_INET:
1057                         if (no_v4bind != 0) {
1058                                 sep->se_fd = -1;
1059                                 continue;
1060                         }
1061                         break;
1062 #ifdef INET6
1063                 case AF_INET6:
1064                         if (no_v6bind != 0) {
1065                                 sep->se_fd = -1;
1066                                 continue;
1067                         }
1068                         break;
1069 #endif
1070                 }
1071                 if (!sep->se_rpc) {
1072                         if (sep->se_family != AF_UNIX) {
1073                                 sp = getservbyname(sep->se_service, sep->se_proto);
1074                                 if (sp == 0) {
1075                                         syslog(LOG_ERR, "%s/%s: unknown service",
1076                                         sep->se_service, sep->se_proto);
1077                                         sep->se_checked = 0;
1078                                         continue;
1079                                 }
1080                         }
1081                         switch (sep->se_family) {
1082                         case AF_INET:
1083                                 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1084                                         sep->se_ctrladdr4.sin_port =
1085                                                 sp->s_port;
1086                                         sep->se_reset = 1;
1087                                 }
1088                                 break;
1089 #ifdef INET6
1090                         case AF_INET6:
1091                                 if (sp->s_port !=
1092                                     sep->se_ctrladdr6.sin6_port) {
1093                                         sep->se_ctrladdr6.sin6_port =
1094                                                 sp->s_port;
1095                                         sep->se_reset = 1;
1096                                 }
1097                                 break;
1098 #endif
1099                         }
1100                         if (sep->se_reset != 0 && sep->se_fd >= 0)
1101                                 close_sep(sep);
1102                 } else {
1103                         rpc = getrpcbyname(sep->se_service);
1104                         if (rpc == 0) {
1105                                 syslog(LOG_ERR, "%s/%s unknown RPC service",
1106                                         sep->se_service, sep->se_proto);
1107                                 if (sep->se_fd != -1)
1108                                         (void) close(sep->se_fd);
1109                                 sep->se_fd = -1;
1110                                         continue;
1111                         }
1112                         if (sep->se_reset != 0 ||
1113                             rpc->r_number != sep->se_rpc_prog) {
1114                                 if (sep->se_rpc_prog)
1115                                         unregisterrpc(sep);
1116                                 sep->se_rpc_prog = rpc->r_number;
1117                                 if (sep->se_fd != -1)
1118                                         (void) close(sep->se_fd);
1119                                 sep->se_fd = -1;
1120                         }
1121                         sep->se_nomapped = new_nomapped;
1122                 }
1123                 sep->se_reset = 0;
1124                 if (sep->se_fd == -1)
1125                         setup(sep);
1126         }
1127         endconfig();
1128         /*
1129          * Purge anything not looked at above.
1130          */
1131         omask = sigblock(SIGBLOCK);
1132         sepp = &servtab;
1133         while ((sep = *sepp)) {
1134                 if (sep->se_checked) {
1135                         sepp = &sep->se_next;
1136                         continue;
1137                 }
1138                 *sepp = sep->se_next;
1139                 if (sep->se_fd >= 0)
1140                         close_sep(sep);
1141                 if (debug)
1142                         print_service("FREE", sep);
1143                 if (sep->se_rpc && sep->se_rpc_prog > 0)
1144                         unregisterrpc(sep);
1145                 freeconfig(sep);
1146                 free(sep);
1147         }
1148         (void) sigsetmask(omask);
1149 }
1150
1151 void
1152 unregisterrpc(struct servtab *sep)
1153 {
1154         u_int i;
1155         struct servtab *sepp;
1156         long omask;
1157         struct netconfig *netid4, *netid6;
1158
1159         omask = sigblock(SIGBLOCK);
1160         netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf;
1161         netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf;
1162         if (sep->se_family == AF_INET)
1163                 netid6 = NULL;
1164         else if (sep->se_nomapped)
1165                 netid4 = NULL;
1166         /*
1167          * Conflict if same prog and protocol - In that case one should look
1168          * to versions, but it is not interesting: having separate servers for
1169          * different versions does not work well.
1170          * Therefore one do not unregister if there is a conflict.
1171          * There is also transport conflict if destroying INET when INET46
1172          * exists, or destroying INET46 when INET exists
1173          */
1174         for (sepp = servtab; sepp; sepp = sepp->se_next) {
1175                 if (sepp == sep)
1176                         continue;
1177                 if (sepp->se_checked == 0 ||
1178                     !sepp->se_rpc ||
1179                     strcmp(sep->se_proto, sepp->se_proto) != 0 ||
1180                     sep->se_rpc_prog != sepp->se_rpc_prog)
1181                         continue;
1182                 if (sepp->se_family == AF_INET)
1183                         netid4 = NULL;
1184                 if (sepp->se_family == AF_INET6) {
1185                         netid6 = NULL;
1186                         if (!sep->se_nomapped)
1187                                 netid4 = NULL;
1188                 }
1189                 if (netid4 == NULL && netid6 == NULL)
1190                         return;
1191         }
1192         if (debug)
1193                 print_service("UNREG", sep);
1194         for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1195                 if (netid4)
1196                         rpcb_unset(sep->se_rpc_prog, i, netid4);
1197                 if (netid6)
1198                         rpcb_unset(sep->se_rpc_prog, i, netid6);
1199         }
1200         if (sep->se_fd != -1)
1201                 (void) close(sep->se_fd);
1202         sep->se_fd = -1;
1203         (void) sigsetmask(omask);
1204 }
1205
1206 void
1207 flag_retry(int signo __unused)
1208 {
1209         flag_signal('A');
1210 }
1211
1212 void
1213 retry(void)
1214 {
1215         struct servtab *sep;
1216
1217         timingout = 0;
1218         for (sep = servtab; sep; sep = sep->se_next)
1219                 if (sep->se_fd == -1 && !ISMUX(sep))
1220                         setup(sep);
1221 }
1222
1223 void
1224 setup(struct servtab *sep)
1225 {
1226         int on = 1;
1227
1228         if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1229                 if (debug)
1230                         warn("socket failed on %s/%s",
1231                                 sep->se_service, sep->se_proto);
1232                 syslog(LOG_ERR, "%s/%s: socket: %m",
1233                     sep->se_service, sep->se_proto);
1234                 return;
1235         }
1236 #define turnon(fd, opt) \
1237 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1238         if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1239             turnon(sep->se_fd, SO_DEBUG) < 0)
1240                 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1241         if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1242                 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1243 #ifdef SO_PRIVSTATE
1244         if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1245                 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1246 #endif
1247         /* tftpd opens a new connection then needs more infos */
1248         if ((sep->se_family == AF_INET6) &&
1249             (strcmp(sep->se_proto, "udp") == 0) &&
1250             (sep->se_accept == 0) &&
1251             (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO,
1252                         (char *)&on, sizeof (on)) < 0))
1253                 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1254         if (sep->se_family == AF_INET6) {
1255                 int flag = sep->se_nomapped ? 1 : 0;
1256                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1257                                (char *)&flag, sizeof (flag)) < 0)
1258                         syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1259         }
1260 #undef turnon
1261         if (sep->se_type == TTCP_TYPE)
1262                 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH,
1263                     (char *)&on, sizeof (on)) < 0)
1264                         syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m");
1265 #ifdef IPV6_FAITH
1266         if (sep->se_type == FAITH_TYPE) {
1267                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on,
1268                                 sizeof(on)) < 0) {
1269                         syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m");
1270                 }
1271         }
1272 #endif
1273 #ifdef IPSEC
1274         ipsecsetup(sep);
1275 #endif
1276         if (sep->se_family == AF_UNIX) {
1277                 (void) unlink(sep->se_ctrladdr_un.sun_path);
1278                 umask(0777); /* Make socket with conservative permissions */
1279         }
1280         if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1281             sep->se_ctrladdr_size) < 0) {
1282                 if (debug)
1283                         warn("bind failed on %s/%s",
1284                                 sep->se_service, sep->se_proto);
1285                 syslog(LOG_ERR, "%s/%s: bind: %m",
1286                     sep->se_service, sep->se_proto);
1287                 (void) close(sep->se_fd);
1288                 sep->se_fd = -1;
1289                 if (!timingout) {
1290                         timingout = 1;
1291                         alarm(RETRYTIME);
1292                 }
1293                 if (sep->se_family == AF_UNIX)
1294                         umask(mask);
1295                 return;
1296         }
1297         if (sep->se_family == AF_UNIX) {
1298                 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1299                 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1300                         syslog(LOG_ERR, "chown socket: %m");
1301                 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1302                         syslog(LOG_ERR, "chmod socket: %m");
1303                 umask(mask);
1304         }
1305         if (sep->se_rpc) {
1306                 u_int i;
1307                 socklen_t len = sep->se_ctrladdr_size;
1308                 struct netconfig *netid, *netid2 = NULL;
1309                 struct sockaddr_in sock;
1310                 struct netbuf nbuf, nbuf2;
1311
1312                 if (getsockname(sep->se_fd,
1313                                 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1314                         syslog(LOG_ERR, "%s/%s: getsockname: %m",
1315                                sep->se_service, sep->se_proto);
1316                         (void) close(sep->se_fd);
1317                         sep->se_fd = -1;
1318                         return;
1319                 }
1320                 nbuf.buf = &sep->se_ctrladdr;
1321                 nbuf.len = sep->se_ctrladdr.sa_len;
1322                 if (sep->se_family == AF_INET)
1323                         netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf;
1324                 else  {
1325                         netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf;
1326                         if (!sep->se_nomapped) { /* INET and INET6 */
1327                                 netid2 = netid==udp6conf? udpconf:tcpconf;
1328                                 memset(&sock, 0, sizeof sock);  /* ADDR_ANY */
1329                                 nbuf2.buf = &sock;
1330                                 nbuf2.len = sock.sin_len = sizeof sock;
1331                                 sock.sin_family = AF_INET;
1332                                 sock.sin_port = sep->se_ctrladdr6.sin6_port;
1333                         }
1334                 }
1335                 if (debug)
1336                         print_service("REG ", sep);
1337                 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1338                         rpcb_unset(sep->se_rpc_prog, i, netid);
1339                         rpcb_set(sep->se_rpc_prog, i, netid, &nbuf);
1340                         if (netid2) {
1341                                 rpcb_unset(sep->se_rpc_prog, i, netid2);
1342                                 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2);
1343                         }
1344                 }
1345         }
1346         if (sep->se_socktype == SOCK_STREAM)
1347                 listen(sep->se_fd, 64);
1348         enable(sep);
1349         if (debug) {
1350                 warnx("registered %s on %d",
1351                         sep->se_server, sep->se_fd);
1352         }
1353 }
1354
1355 #ifdef IPSEC
1356 void
1357 ipsecsetup(sep)
1358         struct servtab *sep;
1359 {
1360         char *buf;
1361         char *policy_in = NULL;
1362         char *policy_out = NULL;
1363         int level;
1364         int opt;
1365
1366         switch (sep->se_family) {
1367         case AF_INET:
1368                 level = IPPROTO_IP;
1369                 opt = IP_IPSEC_POLICY;
1370                 break;
1371 #ifdef INET6
1372         case AF_INET6:
1373                 level = IPPROTO_IPV6;
1374                 opt = IPV6_IPSEC_POLICY;
1375                 break;
1376 #endif
1377         default:
1378                 return;
1379         }
1380
1381         if (!sep->se_policy || sep->se_policy[0] == '\0') {
1382                 static char def_in[] = "in entrust", def_out[] = "out entrust";
1383                 policy_in = def_in;
1384                 policy_out = def_out;
1385         } else {
1386                 if (!strncmp("in", sep->se_policy, 2))
1387                         policy_in = sep->se_policy;
1388                 else if (!strncmp("out", sep->se_policy, 3))
1389                         policy_out = sep->se_policy;
1390                 else {
1391                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1392                                 sep->se_policy);
1393                         return;
1394                 }
1395         }
1396
1397         if (policy_in != NULL) {
1398                 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1399                 if (buf != NULL) {
1400                         if (setsockopt(sep->se_fd, level, opt,
1401                                         buf, ipsec_get_policylen(buf)) < 0 &&
1402                             debug != 0)
1403                                 warnx("%s/%s: ipsec initialization failed; %s",
1404                                       sep->se_service, sep->se_proto,
1405                                       policy_in);
1406                         free(buf);
1407                 } else
1408                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1409                                 policy_in);
1410         }
1411         if (policy_out != NULL) {
1412                 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1413                 if (buf != NULL) {
1414                         if (setsockopt(sep->se_fd, level, opt,
1415                                         buf, ipsec_get_policylen(buf)) < 0 &&
1416                             debug != 0)
1417                                 warnx("%s/%s: ipsec initialization failed; %s",
1418                                       sep->se_service, sep->se_proto,
1419                                       policy_out);
1420                         free(buf);
1421                 } else
1422                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1423                                 policy_out);
1424         }
1425 }
1426 #endif
1427
1428 /*
1429  * Finish with a service and its socket.
1430  */
1431 void
1432 close_sep(struct servtab *sep)
1433 {
1434         if (sep->se_fd >= 0) {
1435                 if (FD_ISSET(sep->se_fd, &allsock))
1436                         disable(sep);
1437                 (void) close(sep->se_fd);
1438                 sep->se_fd = -1;
1439         }
1440         sep->se_count = 0;
1441         sep->se_numchild = 0;   /* forget about any existing children */
1442 }
1443
1444 int
1445 matchservent(const char *name1, const char *name2, const char *proto)
1446 {
1447         char **alias, *p;
1448         struct servent *se;
1449
1450         if (strcmp(proto, "unix") == 0) {
1451                 if ((p = strrchr(name1, '/')) != NULL)
1452                         name1 = p + 1;
1453                 if ((p = strrchr(name2, '/')) != NULL)
1454                         name2 = p + 1;
1455         }
1456         if (strcmp(name1, name2) == 0)
1457                 return(1);
1458         if ((se = getservbyname(name1, proto)) != NULL) {
1459                 if (strcmp(name2, se->s_name) == 0)
1460                         return(1);
1461                 for (alias = se->s_aliases; *alias; alias++)
1462                         if (strcmp(name2, *alias) == 0)
1463                                 return(1);
1464         }
1465         return(0);
1466 }
1467
1468 struct servtab *
1469 enter(struct servtab *cp)
1470 {
1471         struct servtab *sep;
1472         long omask;
1473
1474         sep = (struct servtab *)malloc(sizeof (*sep));
1475         if (sep == (struct servtab *)0) {
1476                 syslog(LOG_ERR, "malloc: %m");
1477                 exit(EX_OSERR);
1478         }
1479         *sep = *cp;
1480         sep->se_fd = -1;
1481         omask = sigblock(SIGBLOCK);
1482         sep->se_next = servtab;
1483         servtab = sep;
1484         sigsetmask(omask);
1485         return (sep);
1486 }
1487
1488 void
1489 enable(struct servtab *sep)
1490 {
1491         if (debug)
1492                 warnx(
1493                     "enabling %s, fd %d", sep->se_service, sep->se_fd);
1494 #ifdef SANITY_CHECK
1495         if (sep->se_fd < 0) {
1496                 syslog(LOG_ERR,
1497                     "%s: %s: bad fd", __FUNCTION__, sep->se_service);
1498                 exit(EX_SOFTWARE);
1499         }
1500         if (ISMUX(sep)) {
1501                 syslog(LOG_ERR,
1502                     "%s: %s: is mux", __FUNCTION__, sep->se_service);
1503                 exit(EX_SOFTWARE);
1504         }
1505         if (FD_ISSET(sep->se_fd, &allsock)) {
1506                 syslog(LOG_ERR,
1507                     "%s: %s: not off", __FUNCTION__, sep->se_service);
1508                 exit(EX_SOFTWARE);
1509         }
1510         nsock++;
1511 #endif
1512         FD_SET(sep->se_fd, &allsock);
1513         if (sep->se_fd > maxsock)
1514                 maxsock = sep->se_fd;
1515 }
1516
1517 void
1518 disable(struct servtab *sep)
1519 {
1520         if (debug)
1521                 warnx(
1522                     "disabling %s, fd %d", sep->se_service, sep->se_fd);
1523 #ifdef SANITY_CHECK
1524         if (sep->se_fd < 0) {
1525                 syslog(LOG_ERR,
1526                     "%s: %s: bad fd", __FUNCTION__, sep->se_service);
1527                 exit(EX_SOFTWARE);
1528         }
1529         if (ISMUX(sep)) {
1530                 syslog(LOG_ERR,
1531                     "%s: %s: is mux", __FUNCTION__, sep->se_service);
1532                 exit(EX_SOFTWARE);
1533         }
1534         if (!FD_ISSET(sep->se_fd, &allsock)) {
1535                 syslog(LOG_ERR,
1536                     "%s: %s: not on", __FUNCTION__, sep->se_service);
1537                 exit(EX_SOFTWARE);
1538         }
1539         if (nsock == 0) {
1540                 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__);
1541                 exit(EX_SOFTWARE);
1542         }
1543         nsock--;
1544 #endif
1545         FD_CLR(sep->se_fd, &allsock);
1546         if (sep->se_fd == maxsock)
1547                 maxsock--;
1548 }
1549
1550 FILE    *fconfig = NULL;
1551 struct  servtab serv;
1552 char    line[LINE_MAX];
1553
1554 int
1555 setconfig(void)
1556 {
1557
1558         if (fconfig != NULL) {
1559                 fseek(fconfig, 0L, SEEK_SET);
1560                 return (1);
1561         }
1562         fconfig = fopen(CONFIG, "r");
1563         return (fconfig != NULL);
1564 }
1565
1566 void
1567 endconfig(void)
1568 {
1569         if (fconfig) {
1570                 (void) fclose(fconfig);
1571                 fconfig = NULL;
1572         }
1573 }
1574
1575 struct servtab *
1576 getconfigent(void)
1577 {
1578         struct servtab *sep = &serv;
1579         int argc;
1580         char *cp, *arg, *s;
1581         char *versp;
1582         static char TCPMUX_TOKEN[] = "tcpmux/";
1583 #define MUX_LEN         (sizeof(TCPMUX_TOKEN)-1)
1584 #ifdef IPSEC
1585         char *policy = NULL;
1586 #endif
1587         int v4bind = 0;
1588 #ifdef INET6
1589         int v6bind = 0;
1590 #endif
1591         int i;
1592
1593 more:
1594         while ((cp = nextline(fconfig)) != NULL) {
1595 #ifdef IPSEC
1596                 /* lines starting with #@ is not a comment, but the policy */
1597                 if (cp[0] == '#' && cp[1] == '@') {
1598                         char *p;
1599                         for (p = cp + 2; p && *p && isspace(*p); p++)
1600                                 ;
1601                         if (*p == '\0') {
1602                                 if (policy)
1603                                         free(policy);
1604                                 policy = NULL;
1605                         } else if (ipsec_get_policylen(p) >= 0) {
1606                                 if (policy)
1607                                         free(policy);
1608                                 policy = newstr(p);
1609                         } else {
1610                                 syslog(LOG_ERR,
1611                                         "%s: invalid ipsec policy \"%s\"",
1612                                         CONFIG, p);
1613                                 exit(EX_CONFIG);
1614                         }
1615                 }
1616 #endif
1617                 if (*cp == '#' || *cp == '\0')
1618                         continue;
1619                 break;
1620         }
1621         if (cp == NULL)
1622                 return ((struct servtab *)0);
1623         /*
1624          * clear the static buffer, since some fields (se_ctrladdr,
1625          * for example) don't get initialized here.
1626          */
1627         memset(sep, 0, sizeof *sep);
1628         arg = skip(&cp);
1629         if (cp == NULL) {
1630                 /* got an empty line containing just blanks/tabs. */
1631                 goto more;
1632         }
1633         if (arg[0] == ':') { /* :user:group:perm: */
1634                 char *user, *group, *perm;
1635                 struct passwd *pw;
1636                 struct group *gr;
1637                 user = arg+1;
1638                 if ((group = strchr(user, ':')) == NULL) {
1639                         syslog(LOG_ERR, "no group after user '%s'", user);
1640                         goto more;
1641                 }
1642                 *group++ = '\0';
1643                 if ((perm = strchr(group, ':')) == NULL) {
1644                         syslog(LOG_ERR, "no mode after group '%s'", group);
1645                         goto more;
1646                 }
1647                 *perm++ = '\0';
1648                 if ((pw = getpwnam(user)) == NULL) {
1649                         syslog(LOG_ERR, "no such user '%s'", user);
1650                         goto more;
1651                 }
1652                 sep->se_sockuid = pw->pw_uid;
1653                 if ((gr = getgrnam(group)) == NULL) {
1654                         syslog(LOG_ERR, "no such user '%s'", group);
1655                         goto more;
1656                 }
1657                 sep->se_sockgid = gr->gr_gid;
1658                 sep->se_sockmode = strtol(perm, &arg, 8);
1659                 if (*arg != ':') {
1660                         syslog(LOG_ERR, "bad mode '%s'", perm);
1661                         goto more;
1662                 }
1663                 *arg++ = '\0';
1664         } else {
1665                 sep->se_sockuid = euid;
1666                 sep->se_sockgid = egid;
1667                 sep->se_sockmode = 0200;
1668         }
1669         if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1670                 char *c = arg + MUX_LEN;
1671                 if (*c == '+') {
1672                         sep->se_type = MUXPLUS_TYPE;
1673                         c++;
1674                 } else
1675                         sep->se_type = MUX_TYPE;
1676                 sep->se_service = newstr(c);
1677         } else {
1678                 sep->se_service = newstr(arg);
1679                 sep->se_type = NORM_TYPE;
1680         }
1681         arg = sskip(&cp);
1682         if (strcmp(arg, "stream") == 0)
1683                 sep->se_socktype = SOCK_STREAM;
1684         else if (strcmp(arg, "dgram") == 0)
1685                 sep->se_socktype = SOCK_DGRAM;
1686         else if (strcmp(arg, "rdm") == 0)
1687                 sep->se_socktype = SOCK_RDM;
1688         else if (strcmp(arg, "seqpacket") == 0)
1689                 sep->se_socktype = SOCK_SEQPACKET;
1690         else if (strcmp(arg, "raw") == 0)
1691                 sep->se_socktype = SOCK_RAW;
1692         else
1693                 sep->se_socktype = -1;
1694
1695         arg = sskip(&cp);
1696         if (strncmp(arg, "tcp", 3) == 0) {
1697                 sep->se_proto = newstr(strsep(&arg, "/"));
1698                 if (arg != NULL) {
1699                         if (strcmp(arg, "ttcp") == 0)
1700                                 sep->se_type = TTCP_TYPE;
1701                         else if (strcmp(arg, "faith") == 0)
1702                                 sep->se_type = FAITH_TYPE;
1703                 }
1704         } else {
1705                 if (sep->se_type == NORM_TYPE &&
1706                     strncmp(arg, "faith/", 6) == 0) {
1707                         arg += 6;
1708                         sep->se_type = FAITH_TYPE;
1709                 }
1710                 sep->se_proto = newstr(arg);
1711         }
1712         if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1713                 memmove(sep->se_proto, sep->se_proto + 4,
1714                     strlen(sep->se_proto) + 1 - 4);
1715                 sep->se_rpc = 1;
1716                 sep->se_rpc_prog = sep->se_rpc_lowvers =
1717                         sep->se_rpc_lowvers = 0;
1718                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1719                        sizeof(sep->se_ctrladdr4));
1720                 if ((versp = rindex(sep->se_service, '/'))) {
1721                         *versp++ = '\0';
1722                         switch (sscanf(versp, "%d-%d",
1723                                        &sep->se_rpc_lowvers,
1724                                        &sep->se_rpc_highvers)) {
1725                         case 2:
1726                                 break;
1727                         case 1:
1728                                 sep->se_rpc_highvers =
1729                                         sep->se_rpc_lowvers;
1730                                 break;
1731                         default:
1732                                 syslog(LOG_ERR,
1733                                         "bad RPC version specifier; %s",
1734                                         sep->se_service);
1735                                 freeconfig(sep);
1736                                 goto more;
1737                         }
1738                 }
1739                 else {
1740                         sep->se_rpc_lowvers =
1741                                 sep->se_rpc_highvers = 1;
1742                 }
1743         }
1744         sep->se_nomapped = 0;
1745         while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1746 #ifdef INET6
1747                 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1748                         sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1749                         v6bind = 1;
1750                         continue;
1751                 }
1752 #endif
1753                 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1754                         sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1755                         v4bind = 1;
1756                         continue;
1757                 }
1758                 /* illegal version num */
1759                 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1760                 freeconfig(sep);
1761                 goto more;
1762         }
1763         if (strcmp(sep->se_proto, "unix") == 0) {
1764                 sep->se_family = AF_UNIX;
1765         } else
1766 #ifdef INET6
1767         if (v6bind != 0 && no_v6bind != 0) {
1768                 syslog(LOG_INFO, "IPv6 bind is ignored for %s",
1769                        sep->se_service);
1770                 if (v4bind && no_v4bind == 0)
1771                         v6bind = 0;
1772                 else {
1773                         freeconfig(sep);
1774                         goto more;
1775                 }
1776         }
1777         if (v6bind != 0) {
1778                 sep->se_family = AF_INET6;
1779                 if (v4bind == 0 || no_v4bind != 0)
1780                         sep->se_nomapped = 1;
1781         } else
1782 #endif
1783         { /* default to v4 bind if not v6 bind */
1784                 if (no_v4bind != 0) {
1785                         syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1786                                sep->se_service);
1787                         freeconfig(sep);
1788                         goto more;
1789                 }
1790                 sep->se_family = AF_INET;
1791         }
1792         /* init ctladdr */
1793         switch(sep->se_family) {
1794         case AF_INET:
1795                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1796                        sizeof(sep->se_ctrladdr4));
1797                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1798                 break;
1799 #ifdef INET6
1800         case AF_INET6:
1801                 memcpy(&sep->se_ctrladdr6, bind_sa6,
1802                        sizeof(sep->se_ctrladdr6));
1803                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1804                 break;
1805 #endif
1806         case AF_UNIX:
1807                 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1808                         syslog(LOG_ERR,
1809                             "domain socket pathname too long for service %s",
1810                             sep->se_service);
1811                         goto more;
1812                 }
1813                 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1814                 sep->se_ctrladdr_un.sun_family = sep->se_family;
1815                 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1816                 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1817                 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1818         }
1819         arg = sskip(&cp);
1820         if (!strncmp(arg, "wait", 4))
1821                 sep->se_accept = 0;
1822         else if (!strncmp(arg, "nowait", 6))
1823                 sep->se_accept = 1;
1824         else {
1825                 syslog(LOG_ERR,
1826                         "%s: bad wait/nowait for service %s",
1827                         CONFIG, sep->se_service);
1828                 goto more;
1829         }
1830         sep->se_maxchild = -1;
1831         sep->se_maxcpm = -1;
1832         sep->se_maxperip = -1;
1833         if ((s = strchr(arg, '/')) != NULL) {
1834                 char *eptr;
1835                 u_long val;
1836
1837                 val = strtoul(s + 1, &eptr, 10);
1838                 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1839                         syslog(LOG_ERR,
1840                                 "%s: bad max-child for service %s",
1841                                 CONFIG, sep->se_service);
1842                         goto more;
1843                 }
1844                 if (debug)
1845                         if (!sep->se_accept && val != 1)
1846                                 warnx("maxchild=%lu for wait service %s"
1847                                     " not recommended", val, sep->se_service);
1848                 sep->se_maxchild = val;
1849                 if (*eptr == '/')
1850                         sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1851                 if (*eptr == '/')
1852                         sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1853                 /*
1854                  * explicitly do not check for \0 for future expansion /
1855                  * backwards compatibility
1856                  */
1857         }
1858         if (ISMUX(sep)) {
1859                 /*
1860                  * Silently enforce "nowait" mode for TCPMUX services
1861                  * since they don't have an assigned port to listen on.
1862                  */
1863                 sep->se_accept = 1;
1864                 if (strcmp(sep->se_proto, "tcp")) {
1865                         syslog(LOG_ERR,
1866                                 "%s: bad protocol for tcpmux service %s",
1867                                 CONFIG, sep->se_service);
1868                         goto more;
1869                 }
1870                 if (sep->se_socktype != SOCK_STREAM) {
1871                         syslog(LOG_ERR,
1872                                 "%s: bad socket type for tcpmux service %s",
1873                                 CONFIG, sep->se_service);
1874                         goto more;
1875                 }
1876         }
1877         sep->se_user = newstr(sskip(&cp));
1878 #ifdef LOGIN_CAP
1879         if ((s = strrchr(sep->se_user, '/')) != NULL) {
1880                 *s = '\0';
1881                 sep->se_class = newstr(s + 1);
1882         } else
1883                 sep->se_class = newstr(RESOURCE_RC);
1884 #endif
1885         if ((s = strrchr(sep->se_user, ':')) != NULL) {
1886                 *s = '\0';
1887                 sep->se_group = newstr(s + 1);
1888         } else
1889                 sep->se_group = NULL;
1890         sep->se_server = newstr(sskip(&cp));
1891         if ((sep->se_server_name = rindex(sep->se_server, '/')))
1892                 sep->se_server_name++;
1893         if (strcmp(sep->se_server, "internal") == 0) {
1894                 struct biltin *bi;
1895
1896                 for (bi = biltins; bi->bi_service; bi++)
1897                         if (bi->bi_socktype == sep->se_socktype &&
1898                             matchservent(bi->bi_service, sep->se_service,
1899                             sep->se_proto))
1900                                 break;
1901                 if (bi->bi_service == 0) {
1902                         syslog(LOG_ERR, "internal service %s unknown",
1903                                 sep->se_service);
1904                         goto more;
1905                 }
1906                 sep->se_accept = 1;     /* force accept mode for built-ins */
1907                 sep->se_bi = bi;
1908         } else
1909                 sep->se_bi = NULL;
1910         if (sep->se_maxperip < 0)
1911                 sep->se_maxperip = maxperip;
1912         if (sep->se_maxcpm < 0)
1913                 sep->se_maxcpm = maxcpm;
1914         if (sep->se_maxchild < 0) {     /* apply default max-children */
1915                 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1916                         sep->se_maxchild = sep->se_bi->bi_maxchild;
1917                 else if (sep->se_accept)
1918                         sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1919                 else
1920                         sep->se_maxchild = 1;
1921         }
1922         if (sep->se_maxchild > 0) {
1923                 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1924                 if (sep->se_pids == NULL) {
1925                         syslog(LOG_ERR, "malloc: %m");
1926                         exit(EX_OSERR);
1927                 }
1928         }
1929         argc = 0;
1930         for (arg = skip(&cp); cp; arg = skip(&cp))
1931                 if (argc < MAXARGV) {
1932                         sep->se_argv[argc++] = newstr(arg);
1933                 } else {
1934                         syslog(LOG_ERR,
1935                                 "%s: too many arguments for service %s",
1936                                 CONFIG, sep->se_service);
1937                         goto more;
1938                 }
1939         while (argc <= MAXARGV)
1940                 sep->se_argv[argc++] = NULL;
1941         for (i = 0; i < PERIPSIZE; ++i)
1942                 LIST_INIT(&sep->se_conn[i]);
1943 #ifdef IPSEC
1944         sep->se_policy = policy ? newstr(policy) : NULL;
1945 #endif
1946         return (sep);
1947 }
1948
1949 void
1950 freeconfig(struct servtab *cp)
1951 {
1952         int i;
1953
1954         if (cp->se_service)
1955                 free(cp->se_service);
1956         if (cp->se_proto)
1957                 free(cp->se_proto);
1958         if (cp->se_user)
1959                 free(cp->se_user);
1960         if (cp->se_group)
1961                 free(cp->se_group);
1962 #ifdef LOGIN_CAP
1963         if (cp->se_class)
1964                 free(cp->se_class);
1965 #endif
1966         if (cp->se_server)
1967                 free(cp->se_server);
1968         if (cp->se_pids)
1969                 free(cp->se_pids);
1970         for (i = 0; i < MAXARGV; i++)
1971                 if (cp->se_argv[i])
1972                         free(cp->se_argv[i]);
1973         free_connlist(cp);
1974 #ifdef IPSEC
1975         if (cp->se_policy)
1976                 free(cp->se_policy);
1977 #endif
1978 }
1979
1980
1981 /*
1982  * Safe skip - if skip returns null, log a syntax error in the
1983  * configuration file and exit.
1984  */
1985 char *
1986 sskip(char **cpp)
1987 {
1988         char *cp;
1989
1990         cp = skip(cpp);
1991         if (cp == NULL) {
1992                 syslog(LOG_ERR, "%s: syntax error", CONFIG);
1993                 exit(EX_DATAERR);
1994         }
1995         return (cp);
1996 }
1997
1998 char *
1999 skip(char **cpp)
2000 {
2001         char *cp = *cpp;
2002         char *start;
2003         char quote = '\0';
2004
2005 again:
2006         while (*cp == ' ' || *cp == '\t')
2007                 cp++;
2008         if (*cp == '\0') {
2009                 int c;
2010
2011                 c = getc(fconfig);
2012                 (void) ungetc(c, fconfig);
2013                 if (c == ' ' || c == '\t')
2014                         if ((cp = nextline(fconfig)))
2015                                 goto again;
2016                 *cpp = (char *)0;
2017                 return ((char *)0);
2018         }
2019         if (*cp == '"' || *cp == '\'')
2020                 quote = *cp++;
2021         start = cp;
2022         if (quote)
2023                 while (*cp && *cp != quote)
2024                         cp++;
2025         else
2026                 while (*cp && *cp != ' ' && *cp != '\t')
2027                         cp++;
2028         if (*cp != '\0')
2029                 *cp++ = '\0';
2030         *cpp = cp;
2031         return (start);
2032 }
2033
2034 char *
2035 nextline(FILE *fd)
2036 {
2037         char *cp;
2038
2039         if (fgets(line, sizeof (line), fd) == NULL)
2040                 return ((char *)0);
2041         cp = strchr(line, '\n');
2042         if (cp)
2043                 *cp = '\0';
2044         return (line);
2045 }
2046
2047 char *
2048 newstr(const char *cp)
2049 {
2050         char *cr;
2051
2052         if ((cr = strdup(cp != NULL ? cp : "")))
2053                 return (cr);
2054         syslog(LOG_ERR, "strdup: %m");
2055         exit(EX_OSERR);
2056 }
2057
2058 void
2059 inetd_setproctitle(const char *a, int s)
2060 {
2061         socklen_t size;
2062         struct sockaddr_storage ss;
2063         char buf[80], pbuf[INET6_ADDRSTRLEN];
2064
2065         size = sizeof(ss);
2066         if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2067                 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2068                             NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID);
2069                 (void) sprintf(buf, "%s [%s]", a, pbuf);
2070         } else
2071                 (void) sprintf(buf, "%s", a);
2072         setproctitle("%s", buf);
2073 }
2074
2075 int
2076 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2077 {
2078         struct servtab *se2;
2079         char pname[INET6_ADDRSTRLEN];
2080
2081         for (se2 = servtab; se2; se2 = se2->se_next) {
2082                 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2083                         continue;
2084
2085                 switch (se2->se_family) {
2086                 case AF_INET:
2087                         if (((const struct sockaddr_in *)sa)->sin_port ==
2088                             se2->se_ctrladdr4.sin_port)
2089                                 goto isloop;
2090                         continue;
2091 #ifdef INET6
2092                 case AF_INET6:
2093                         if (((const struct sockaddr_in *)sa)->sin_port ==
2094                             se2->se_ctrladdr4.sin_port)
2095                                 goto isloop;
2096                         continue;
2097 #endif
2098                 default:
2099                         continue;
2100                 }
2101         isloop:
2102                 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2103                             NI_NUMERICHOST|NI_WITHSCOPEID);
2104                 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2105                        sep->se_service, sep->se_proto,
2106                        se2->se_service, se2->se_proto,
2107                        pname);
2108                 return 1;
2109         }
2110         return 0;
2111 }
2112
2113 /*
2114  * print_service:
2115  *      Dump relevant information to stderr
2116  */
2117 void
2118 print_service(const char *action, const struct servtab *sep)
2119 {
2120         fprintf(stderr,
2121             "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2122 #ifdef LOGIN_CAP
2123             "class=%s"
2124 #endif
2125             " builtin=%p server=%s"
2126 #ifdef IPSEC
2127             " policy=\"%s\""
2128 #endif
2129             "\n",
2130             action, sep->se_service, sep->se_proto,
2131             sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2132 #ifdef LOGIN_CAP
2133             sep->se_class,
2134 #endif
2135             (void *) sep->se_bi, sep->se_server
2136 #ifdef IPSEC
2137             , (sep->se_policy ? sep->se_policy : "")
2138 #endif
2139             );
2140 }
2141
2142 #define CPMHSIZE        256
2143 #define CPMHMASK        (CPMHSIZE-1)
2144 #define CHTGRAN         10
2145 #define CHTSIZE         6
2146
2147 typedef struct CTime {
2148         unsigned long   ct_Ticks;
2149         int             ct_Count;
2150 } CTime;
2151
2152 typedef struct CHash {
2153         union {
2154                 struct in_addr  c4_Addr;
2155                 struct in6_addr c6_Addr;
2156         } cu_Addr;
2157 #define ch_Addr4        cu_Addr.c4_Addr
2158 #define ch_Addr6        cu_Addr.c6_Addr
2159         int             ch_Family;
2160         time_t          ch_LTime;
2161         char            *ch_Service;
2162         CTime           ch_Times[CHTSIZE];
2163 } CHash;
2164
2165 CHash   CHashAry[CPMHSIZE];
2166
2167 int
2168 cpmip(const struct servtab *sep, int ctrl)
2169 {
2170         struct sockaddr_storage rss;
2171         socklen_t rssLen = sizeof(rss);
2172         int r = 0;
2173
2174         /*
2175          * If getpeername() fails, just let it through (if logging is
2176          * enabled the condition is caught elsewhere)
2177          */
2178
2179         if (sep->se_maxcpm > 0 &&
2180             getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2181                 time_t t = time(NULL);
2182                 int hv = 0xABC3D20F;
2183                 int i;
2184                 int cnt = 0;
2185                 CHash *chBest = NULL;
2186                 unsigned int ticks = t / CHTGRAN;
2187                 struct sockaddr_in *sin4;
2188 #ifdef INET6
2189                 struct sockaddr_in6 *sin6;
2190 #endif
2191
2192                 sin4 = (struct sockaddr_in *)&rss;
2193 #ifdef INET6
2194                 sin6 = (struct sockaddr_in6 *)&rss;
2195 #endif
2196                 {
2197                         char *p;
2198                         int addrlen;
2199
2200                         switch (rss.ss_family) {
2201                         case AF_INET:
2202                                 p = (char *)&sin4->sin_addr;
2203                                 addrlen = sizeof(struct in_addr);
2204                                 break;
2205 #ifdef INET6
2206                         case AF_INET6:
2207                                 p = (char *)&sin6->sin6_addr;
2208                                 addrlen = sizeof(struct in6_addr);
2209                                 break;
2210 #endif
2211                         default:
2212                                 /* should not happen */
2213                                 return -1;
2214                         }
2215
2216                         for (i = 0; i < addrlen; ++i, ++p) {
2217                                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2218                         }
2219                         hv = (hv ^ (hv >> 16));
2220                 }
2221                 for (i = 0; i < 5; ++i) {
2222                         CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2223
2224                         if (rss.ss_family == AF_INET &&
2225                             ch->ch_Family == AF_INET &&
2226                             sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2227                             ch->ch_Service && strcmp(sep->se_service,
2228                             ch->ch_Service) == 0) {
2229                                 chBest = ch;
2230                                 break;
2231                         }
2232 #ifdef INET6
2233                         if (rss.ss_family == AF_INET6 &&
2234                             ch->ch_Family == AF_INET6 &&
2235                             IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2236                                                &ch->ch_Addr6) != 0 &&
2237                             ch->ch_Service && strcmp(sep->se_service,
2238                             ch->ch_Service) == 0) {
2239                                 chBest = ch;
2240                                 break;
2241                         }
2242 #endif
2243                         if (chBest == NULL || ch->ch_LTime == 0 ||
2244                             ch->ch_LTime < chBest->ch_LTime) {
2245                                 chBest = ch;
2246                         }
2247                 }
2248                 if ((rss.ss_family == AF_INET &&
2249                      (chBest->ch_Family != AF_INET ||
2250                       sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2251                     chBest->ch_Service == NULL ||
2252                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2253                         chBest->ch_Family = sin4->sin_family;
2254                         chBest->ch_Addr4 = sin4->sin_addr;
2255                         if (chBest->ch_Service)
2256                                 free(chBest->ch_Service);
2257                         chBest->ch_Service = strdup(sep->se_service);
2258                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2259                 }
2260 #ifdef INET6
2261                 if ((rss.ss_family == AF_INET6 &&
2262                      (chBest->ch_Family != AF_INET6 ||
2263                       IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2264                                          &chBest->ch_Addr6) == 0)) ||
2265                     chBest->ch_Service == NULL ||
2266                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2267                         chBest->ch_Family = sin6->sin6_family;
2268                         chBest->ch_Addr6 = sin6->sin6_addr;
2269                         if (chBest->ch_Service)
2270                                 free(chBest->ch_Service);
2271                         chBest->ch_Service = strdup(sep->se_service);
2272                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2273                 }
2274 #endif
2275                 chBest->ch_LTime = t;
2276                 {
2277                         CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2278                         if (ct->ct_Ticks != ticks) {
2279                                 ct->ct_Ticks = ticks;
2280                                 ct->ct_Count = 0;
2281                         }
2282                         ++ct->ct_Count;
2283                 }
2284                 for (i = 0; i < CHTSIZE; ++i) {
2285                         CTime *ct = &chBest->ch_Times[i];
2286                         if (ct->ct_Ticks <= ticks &&
2287                             ct->ct_Ticks >= ticks - CHTSIZE) {
2288                                 cnt += ct->ct_Count;
2289                         }
2290                 }
2291                 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) {
2292                         char pname[INET6_ADDRSTRLEN];
2293
2294                         getnameinfo((struct sockaddr *)&rss,
2295                                     ((struct sockaddr *)&rss)->sa_len,
2296                                     pname, sizeof(pname), NULL, 0,
2297                                     NI_NUMERICHOST|NI_WITHSCOPEID);
2298                         r = -1;
2299                         syslog(LOG_ERR,
2300                             "%s from %s exceeded counts/min (limit %d/min)",
2301                             sep->se_service, pname,
2302                             sep->se_maxcpm);
2303                 }
2304         }
2305         return(r);
2306 }
2307
2308 static struct conninfo *
2309 search_conn(struct servtab *sep, int ctrl)
2310 {
2311         struct sockaddr_storage ss;
2312         socklen_t sslen = sizeof(ss);
2313         struct conninfo *conn;
2314         int hv;
2315         char pname[NI_MAXHOST],  pname2[NI_MAXHOST];
2316
2317         if (sep->se_maxperip <= 0)
2318                 return NULL;
2319
2320         /*
2321          * If getpeername() fails, just let it through (if logging is
2322          * enabled the condition is caught elsewhere)
2323          */
2324         if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2325                 return NULL;
2326
2327         switch (ss.ss_family) {
2328         case AF_INET:
2329                 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2330                     sizeof(struct in_addr));
2331                 break;
2332 #ifdef INET6
2333         case AF_INET6:
2334                 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2335                     sizeof(struct in6_addr));
2336                 break;
2337 #endif
2338         default:
2339                 /*
2340                  * Since we only support AF_INET and AF_INET6, just
2341                  * let other than AF_INET and AF_INET6 through.
2342                  */
2343                 return NULL;
2344         }
2345
2346         if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2347             NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
2348                 return NULL;
2349
2350         LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2351                 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2352                     conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2353                     NI_NUMERICHOST | NI_WITHSCOPEID) == 0 &&
2354                     strcmp(pname, pname2) == 0)
2355                         break;
2356         }
2357
2358         if (conn == NULL) {
2359                 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2360                         syslog(LOG_ERR, "malloc: %m");
2361                         exit(EX_OSERR);
2362                 }
2363                 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2364                 if (conn->co_proc == NULL) {
2365                         syslog(LOG_ERR, "malloc: %m");
2366                         exit(EX_OSERR);
2367                 }
2368                 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2369                 conn->co_numchild = 0;
2370                 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2371         }
2372
2373         /*
2374          * Since a child process is not invoked yet, we cannot
2375          * determine a pid of a child.  So, co_proc and co_numchild
2376          * should be filled leter.
2377          */
2378
2379         return conn;
2380 }
2381
2382 static int
2383 room_conn(struct servtab *sep, struct conninfo *conn)
2384 {
2385         char pname[NI_MAXHOST];
2386
2387         if (conn->co_numchild >= sep->se_maxperip) {
2388                 getnameinfo((struct sockaddr *)&conn->co_addr,
2389                     conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2390                     NI_NUMERICHOST | NI_WITHSCOPEID);
2391                 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2392                     sep->se_service, pname, sep->se_maxperip);
2393                 return 0;
2394         }
2395         return 1;
2396 }
2397
2398 static void
2399 addchild_conn(struct conninfo *conn, pid_t pid)
2400 {
2401         struct procinfo *proc;
2402
2403         if (conn == NULL)
2404                 return;
2405
2406         if ((proc = search_proc(pid, 1)) != NULL) {
2407                 if (proc->pr_conn != NULL) {
2408                         syslog(LOG_ERR,
2409                             "addchild_conn: child already on process list");
2410                         exit(EX_OSERR);
2411                 }
2412                 proc->pr_conn = conn;
2413         }
2414
2415         conn->co_proc[conn->co_numchild++] = proc;
2416 }
2417
2418 static void
2419 reapchild_conn(pid_t pid)
2420 {
2421         struct procinfo *proc;
2422         struct conninfo *conn;
2423         int i;
2424
2425         if ((proc = search_proc(pid, 0)) == NULL)
2426                 return;
2427         if ((conn = proc->pr_conn) == NULL)
2428                 return;
2429         for (i = 0; i < conn->co_numchild; ++i)
2430                 if (conn->co_proc[i] == proc) {
2431                         conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2432                         break;
2433                 }
2434         free_proc(proc);
2435         free_conn(conn);
2436 }
2437
2438 static void
2439 resize_conn(struct servtab *sep, int maxperip)
2440 {
2441         struct conninfo *conn;
2442         int i, j;
2443
2444         if (sep->se_maxperip <= 0)
2445                 return;
2446         if (maxperip <= 0) {
2447                 free_connlist(sep);
2448                 return;
2449         }
2450         for (i = 0; i < PERIPSIZE; ++i) {
2451                 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2452                         for (j = maxperip; j < conn->co_numchild; ++j)
2453                                 free_proc(conn->co_proc[j]);
2454                         conn->co_proc = realloc(conn->co_proc,
2455                             maxperip * sizeof(*conn->co_proc));
2456                         if (conn->co_proc == NULL) {
2457                                 syslog(LOG_ERR, "realloc: %m");
2458                                 exit(EX_OSERR);
2459                         }
2460                         if (conn->co_numchild > maxperip)
2461                                 conn->co_numchild = maxperip;
2462                 }
2463         }
2464 }
2465
2466 static void
2467 free_connlist(struct servtab *sep)
2468 {
2469         struct conninfo *conn;
2470         int i, j;
2471
2472         for (i = 0; i < PERIPSIZE; ++i) {
2473                 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2474                         for (j = 0; j < conn->co_numchild; ++j)
2475                                 free_proc(conn->co_proc[j]);
2476                         conn->co_numchild = 0;
2477                         free_conn(conn);
2478                 }
2479         }
2480 }
2481
2482 static void
2483 free_conn(struct conninfo *conn)
2484 {
2485         if (conn == NULL)
2486                 return;
2487         if (conn->co_numchild <= 0) {
2488                 LIST_REMOVE(conn, co_link);
2489                 free(conn->co_proc);
2490                 free(conn);
2491         }
2492 }
2493
2494 static struct procinfo *
2495 search_proc(pid_t pid, int add)
2496 {
2497         struct procinfo *proc;
2498         int hv;
2499
2500         hv = hashval((char *)&pid, sizeof(pid));
2501         LIST_FOREACH(proc, &proctable[hv], pr_link) {
2502                 if (proc->pr_pid == pid)
2503                         break;
2504         }
2505         if (proc == NULL && add) {
2506                 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2507                         syslog(LOG_ERR, "malloc: %m");
2508                         exit(EX_OSERR);
2509                 }
2510                 proc->pr_pid = pid;
2511                 proc->pr_conn = NULL;
2512                 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2513         }
2514         return proc;
2515 }
2516
2517 static void
2518 free_proc(struct procinfo *proc)
2519 {
2520         if (proc == NULL)
2521                 return;
2522         LIST_REMOVE(proc, pr_link);
2523         free(proc);
2524 }
2525
2526 static int
2527 hashval(char *p, int len)
2528 {
2529         int i, hv = 0xABC3D20F;
2530
2531         for (i = 0; i < len; ++i, ++p)
2532                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2533         hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2534         return hv;
2535 }