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 static const char rcsid[] =
  45   "$FreeBSD$";
  46 #endif /* not lint */
  47
  48 /*
  49  * Inetd - Internet super-server
  50  *
  51  * This program invokes all internet services as needed.  Connection-oriented
  52  * services are invoked each time a connection is made, by creating a process.
  53  * This process is passed the connection as file descriptor 0 and is expected
  54  * to do a getpeername to find out the source host and port.
  55  *
  56  * Datagram oriented services are invoked when a datagram
  57  * arrives; a process is created and passed a pending message
  58  * on file descriptor 0.  Datagram servers may either connect
  59  * to their peer, freeing up the original socket for inetd
  60  * to receive further messages on, or ``take over the socket'',
  61  * processing all arriving datagrams and, eventually, timing
  62  * out.  The first type of server is said to be ``multi-threaded'';
  63  * the second type of server ``single-threaded''.
  64  *
  65  * Inetd uses a configuration file which is read at startup
  66  * and, possibly, at some later time in response to a hangup signal.
  67  * The configuration file is ``free format'' with fields given in the
  68  * order shown below.  Continuation lines for an entry must begin with
  69  * a space or tab.  All fields must be present in each entry.
  70  *
  71  *      service name                    must be in /etc/services
  72  *                                      or name a tcpmux service
  73  *                                      or specify a unix domain socket
  74  *      socket type                     stream/dgram/raw/rdm/seqpacket
  75  *      protocol                        tcp[4][6][/faith,ttcp], udp[4][6], unix
  76  *      wait/nowait                     single-threaded/multi-threaded
  77  *      user                            user to run daemon as
  78  *      server program                  full path name
  79  *      server program arguments        maximum of MAXARGS (20)
  80  *
  81  * TCP services without official port numbers are handled with the
  82  * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
  83  * requests. When a connection is made from a foreign host, the service
  84  * requested is passed to tcpmux, which looks it up in the servtab list
  85  * and returns the proper entry for the service. Tcpmux returns a
  86  * negative reply if the service doesn't exist, otherwise the invoked
  87  * server is expected to return the positive reply if the service type in
  88  * inetd.conf file has the prefix "tcpmux/". If the service type has the
  89  * prefix "tcpmux/+", tcpmux will return the positive reply for the
  90  * process; this is for compatibility with older server code, and also
  91  * allows you to invoke programs that use stdin/stdout without putting any
  92  * special server code in them. Services that use tcpmux are "nowait"
  93  * because they do not have a well-known port and hence cannot listen
  94  * for new requests.
  95  *
  96  * For RPC services
  97  *      service name/version            must be in /etc/rpc
  98  *      socket type                     stream/dgram/raw/rdm/seqpacket
  99  *      protocol                        rpc/tcp, rpc/udp
 100  *      wait/nowait                     single-threaded/multi-threaded
 101  *      user                            user to run daemon as
 102  *      server program                  full path name
 103  *      server program arguments        maximum of MAXARGS
 104  *
 105  * Comment lines are indicated by a `#' in column 1.
 106  *
 107  * #ifdef IPSEC
 108  * Comment lines that start with "#@" denote IPsec policy string, as described
 109  * in ipsec_set_policy(3).  This will affect all the following items in
 110  * inetd.conf(8).  To reset the policy, just use "#@" line.  By default,
 111  * there's no IPsec policy.
 112  * #endif
 113  */
 114 #include <sys/param.h>
 115 #include <sys/ioctl.h>
 116 #include <sys/wait.h>
 117 #include <sys/time.h>
 118 #include <sys/resource.h>
 119 #include <sys/stat.h>
 120 #include <sys/un.h>
 121
 122 #include <netinet/in.h>
 123 #include <netinet/tcp.h>
 124 #include <arpa/inet.h>
 125 #include <rpc/rpc.h>
 126 #include <rpc/pmap_clnt.h>
 127
 128 #include <errno.h>
 129 #include <err.h>
 130 #include <fcntl.h>
 131 #include <grp.h>
 132 #include <netdb.h>
 133 #include <pwd.h>
 134 #include <signal.h>
 135 #include <stdio.h>
 136 #include <stdlib.h>
 137 #include <string.h>
 138 #include <syslog.h>
 139 #include <tcpd.h>
 140 #include <unistd.h>
 141 #include <libutil.h>
 142 #include <sysexits.h>
 143 #include <ctype.h>
 144
 145 #include "inetd.h"
 146 #include "pathnames.h"
 147
 148 #ifdef IPSEC
 149 #include <netinet6/ipsec.h>
 150 #ifndef IPSEC_POLICY_IPSEC      /* no ipsec support on old ipsec */
 151 #undef IPSEC
 152 #endif
 153 #endif
 154
 155 /* wrapper for KAME-special getnameinfo() */
 156 #ifndef NI_WITHSCOPEID
 157 #define NI_WITHSCOPEID  0
 158 #endif
 159
 160 #ifndef LIBWRAP_ALLOW_FACILITY
 161 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
 162 #endif
 163 #ifndef LIBWRAP_ALLOW_SEVERITY
 164 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
 165 #endif
 166 #ifndef LIBWRAP_DENY_FACILITY
 167 # define LIBWRAP_DENY_FACILITY LOG_AUTH
 168 #endif
 169 #ifndef LIBWRAP_DENY_SEVERITY
 170 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
 171 #endif
 172
 173 #define ISWRAP(sep)     \
 174            ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
 175         && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
 176         && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
 177             || (sep)->se_socktype == SOCK_DGRAM))
 178
 179 #ifdef LOGIN_CAP
 180 #include <login_cap.h>
 181
 182 /* see init.c */
 183 #define RESOURCE_RC "daemon"
 184
 185 #endif
 186
 187 #ifndef MAXCHILD
 188 #define MAXCHILD        -1              /* maximum number of this service
 189                                            < 0 = no limit */
 190 #endif
 191
 192 #ifndef MAXCPM
 193 #define MAXCPM          -1              /* rate limit invocations from a
 194                                            single remote address,
 195                                            < 0 = no limit */
 196 #endif
 197
 198 #ifndef TOOMANY
 199 #define TOOMANY         256             /* don't start more than TOOMANY */
 200 #endif
 201 #define CNT_INTVL       60              /* servers in CNT_INTVL sec. */
 202 #define RETRYTIME       (60*10)         /* retry after bind or server fail */
 203 #define MAX_MAXCHLD     32767           /* max allowable max children */
 204
 205 #define SIGBLOCK        (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
 206
 207 void            close_sep __P((struct servtab *));
 208 void            flag_signal __P((int));
 209 void            flag_config __P((int));
 210 void            config __P((void));
 211 int             cpmip __P((const struct servtab *, int));
 212 void            endconfig __P((void));
 213 struct servtab *enter __P((struct servtab *));
 214 void            freeconfig __P((struct servtab *));
 215 struct servtab *getconfigent __P((void));
 216 int             matchservent __P((const char *, const char *, const char *));
 217 char           *nextline __P((FILE *));
 218 void            addchild __P((struct servtab *, int));
 219 void            flag_reapchild __P((int));
 220 void            reapchild __P((void));
 221 void            enable __P((struct servtab *));
 222 void            disable __P((struct servtab *));
 223 void            flag_retry __P((int));
 224 void            retry __P((void));
 225 int             setconfig __P((void));
 226 void            setup __P((struct servtab *));
 227 #ifdef IPSEC
 228 void            ipsecsetup __P((struct servtab *));
 229 #endif
 230 void            unregisterrpc __P((register struct servtab *sep));
 231
 232 int     allow_severity;
 233 int     deny_severity;
 234 int     wrap_ex = 0;
 235 int     wrap_bi = 0;
 236 int     debug = 0;
 237 int     log = 0;
 238 int     maxsock;                        /* highest-numbered descriptor */
 239 fd_set  allsock;
 240 int     options;
 241 int     timingout;
 242 int     toomany = TOOMANY;
 243 int     maxchild = MAXCHILD;
 244 int     maxcpm = MAXCPM;
 245 struct  servent *sp;
 246 struct  rpcent *rpc;
 247 char    *hostname = NULL;
 248 struct  sockaddr_in *bind_sa4;
 249 int     no_v4bind = 1;
 250 #ifdef INET6
 251 struct  sockaddr_in6 *bind_sa6;
 252 int     no_v6bind = 1;
 253 #endif
 254 int     signalpipe[2];
 255 #ifdef SANITY_CHECK
 256 int     nsock;
 257 #endif
 258 uid_t   euid;
 259 gid_t   egid;
 260 mode_t  mask;
 261
 262 struct  servtab *servtab;
 263
 264 extern struct biltin biltins[];
 265
 266 #define NUMINT  (sizeof(intab) / sizeof(struct inent))
 267 const char      *CONFIG = _PATH_INETDCONF;
 268 const char      *pid_file = _PATH_INETDPID;
 269
 270 int
 271 getvalue(arg, value, whine)
 272         const char *arg, *whine;
 273         int  *value;
 274 {
 275         int  tmp;
 276         char *p;
 277
 278         tmp = strtol(arg, &p, 0);
 279         if (tmp < 0 || *p) {
 280                 syslog(LOG_ERR, whine, arg);
 281                 return 1;                       /* failure */
 282         }
 283         *value = tmp;
 284         return 0;                               /* success */
 285 }
 286
 287 int
 288 main(argc, argv)
 289         int argc;
 290         char *argv[];
 291 {
 292         struct servtab *sep;
 293         struct passwd *pwd;
 294         struct group *grp;
 295         struct sigaction sa, saalrm, sachld, sahup, sapipe;
 296         int tmpint, ch, dofork;
 297         pid_t pid;
 298         char buf[50];
 299 #ifdef LOGIN_CAP
 300         login_cap_t *lc = NULL;
 301 #endif
 302         struct request_info req;
 303         int denied;
 304         char *service = NULL;
 305         union {
 306                 struct sockaddr peer_un;
 307                 struct sockaddr_in peer_un4;
 308                 struct sockaddr_in6 peer_un6;
 309                 struct sockaddr_storage peer_max;
 310         } p_un;
 311 #define peer    p_un.peer_un
 312 #define peer4   p_un.peer_un4
 313 #define peer6   p_un.peer_un6
 314 #define peermax p_un.peer_max
 315         int i;
 316         struct addrinfo hints, *res;
 317         const char *servname;
 318         int error;
 319
 320         openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
 321
 322         while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:")) != -1)
 323                 switch(ch) {
 324                 case 'd':
 325                         debug = 1;
 326                         options |= SO_DEBUG;
 327                         break;
 328                 case 'l':
 329                         log = 1;
 330                         break;
 331                 case 'R':
 332                         getvalue(optarg, &toomany,
 333                                 "-R %s: bad value for service invocation rate");
 334                         break;
 335                 case 'c':
 336                         getvalue(optarg, &maxchild,
 337                                 "-c %s: bad value for maximum children");
 338                         break;
 339                 case 'C':
 340                         getvalue(optarg, &maxcpm,
 341                                 "-C %s: bad value for maximum children/minute");
 342                         break;
 343                 case 'a':
 344                         hostname = optarg;
 345                         break;
 346                 case 'p':
 347                         pid_file = optarg;
 348                         break;
 349                 case 'w':
 350                         wrap_ex++;
 351                         break;
 352                 case 'W':
 353                         wrap_bi++;
 354                         break;
 355                 case '?':
 356                 default:
 357                         syslog(LOG_ERR,
 358                                 "usage: inetd [-dlwW] [-a address] [-R rate]"
 359                                 " [-c maximum] [-C rate]"
 360                                 " [-p pidfile] [conf-file]");
 361                         exit(EX_USAGE);
 362                 }
 363         /*
 364          * Initialize Bind Addrs.
 365          *   When hostname is NULL, wild card bind addrs are obtained from
 366          *   getaddrinfo(). But getaddrinfo() requires at least one of
 367          *   hostname or servname is non NULL.
 368          *   So when hostname is NULL, set dummy value to servname.
 369          */
 370         servname = (hostname == NULL) ? "discard" /* dummy */ : NULL;
 371
 372         bzero(&hints, sizeof(struct addrinfo));
 373         hints.ai_flags = AI_PASSIVE;
 374         hints.ai_family = AF_UNSPEC;
 375         error = getaddrinfo(hostname, servname, &hints, &res);
 376         if (error != 0) {
 377                 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
 378                 if (error == EAI_SYSTEM)
 379                         syslog(LOG_ERR, "%s", strerror(errno));
 380                 exit(EX_USAGE);
 381         }
 382         do {
 383                 if (res->ai_addr == NULL) {
 384                         syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
 385                         exit(EX_USAGE);
 386                 }
 387                 switch (res->ai_addr->sa_family) {
 388                 case AF_INET:
 389                         if (no_v4bind == 0)
 390                                 continue;
 391                         bind_sa4 = (struct sockaddr_in *)res->ai_addr;
 392                         /* init port num in case servname is dummy */
 393                         bind_sa4->sin_port = 0;
 394                         no_v4bind = 0;
 395                         continue;
 396 #ifdef INET6
 397                 case AF_INET6:
 398                         if (no_v6bind == 0)
 399                                 continue;
 400                         bind_sa6 = (struct sockaddr_in6 *)res->ai_addr;
 401                         /* init port num in case servname is dummy */
 402                         bind_sa6->sin6_port = 0;
 403                         no_v6bind = 0;
 404                         continue;
 405 #endif
 406                 }
 407                 if (no_v4bind == 0
 408 #ifdef INET6
 409                     && no_v6bind == 0
 410 #endif
 411                     )
 412                         break;
 413         } while ((res = res->ai_next) != NULL);
 414         if (no_v4bind != 0
 415 #ifdef INET6
 416             && no_v6bind != 0
 417 #endif
 418             ) {
 419                 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
 420                 exit(EX_USAGE);
 421         }
 422
 423         euid = geteuid();
 424         egid = getegid();
 425         umask(mask = umask(0777));
 426
 427         argc -= optind;
 428         argv += optind;
 429
 430         if (argc > 0)
 431                 CONFIG = argv[0];
 432         if (debug == 0) {
 433                 FILE *fp;
 434                 if (daemon(0, 0) < 0) {
 435                         syslog(LOG_WARNING, "daemon(0,0) failed: %m");
 436                 }
 437                 /*
 438                  * In case somebody has started inetd manually, we need to
 439                  * clear the logname, so that old servers run as root do not
 440                  * get the user's logname..
 441                  */
 442                 if (setlogin("") < 0) {
 443                         syslog(LOG_WARNING, "cannot clear logname: %m");
 444                         /* no big deal if it fails.. */
 445                 }
 446                 pid = getpid();
 447                 fp = fopen(pid_file, "w");
 448                 if (fp) {
 449                         fprintf(fp, "%ld\n", (long)pid);
 450                         fclose(fp);
 451                 } else {
 452                         syslog(LOG_WARNING, "%s: %m", pid_file);
 453                 }
 454         }
 455         sa.sa_flags = 0;
 456         sigemptyset(&sa.sa_mask);
 457         sigaddset(&sa.sa_mask, SIGALRM);
 458         sigaddset(&sa.sa_mask, SIGCHLD);
 459         sigaddset(&sa.sa_mask, SIGHUP);
 460         sa.sa_handler = flag_retry;
 461         sigaction(SIGALRM, &sa, &saalrm);
 462         config();
 463         sa.sa_handler = flag_config;
 464         sigaction(SIGHUP, &sa, &sahup);
 465         sa.sa_handler = flag_reapchild;
 466         sigaction(SIGCHLD, &sa, &sachld);
 467         sa.sa_handler = SIG_IGN;
 468         sigaction(SIGPIPE, &sa, &sapipe);
 469
 470         {
 471                 /* space for daemons to overwrite environment for ps */
 472 #define DUMMYSIZE       100
 473                 char dummy[DUMMYSIZE];
 474
 475                 (void)memset(dummy, 'x', DUMMYSIZE - 1);
 476                 dummy[DUMMYSIZE - 1] = '\0';
 477                 (void)setenv("inetd_dummy", dummy, 1);
 478         }
 479
 480         if (pipe(signalpipe) != 0) {
 481                 syslog(LOG_ERR, "pipe: %m");
 482                 exit(EX_OSERR);
 483         }
 484         FD_SET(signalpipe[0], &allsock);
 485 #ifdef SANITY_CHECK
 486         nsock++;
 487 #endif
 488         if (signalpipe[0] > maxsock)
 489             maxsock = signalpipe[0];
 490         if (signalpipe[1] > maxsock)
 491             maxsock = signalpipe[1];
 492
 493         for (;;) {
 494             int n, ctrl;
 495             fd_set readable;
 496
 497 #ifdef SANITY_CHECK
 498             if (nsock == 0) {
 499                 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__);
 500                 exit(EX_SOFTWARE);
 501             }
 502 #endif
 503             readable = allsock;
 504             if ((n = select(maxsock + 1, &readable, (fd_set *)0,
 505                 (fd_set *)0, (struct timeval *)0)) <= 0) {
 506                     if (n < 0 && errno != EINTR) {
 507                         syslog(LOG_WARNING, "select: %m");
 508                         sleep(1);
 509                     }
 510                     continue;
 511             }
 512             /* handle any queued signal flags */
 513             if (FD_ISSET(signalpipe[0], &readable)) {
 514                 int nsig;
 515                 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
 516                     syslog(LOG_ERR, "ioctl: %m");
 517                     exit(EX_OSERR);
 518                 }
 519                 while (--nsig >= 0) {
 520                     char c;
 521                     if (read(signalpipe[0], &c, 1) != 1) {
 522                         syslog(LOG_ERR, "read: %m");
 523                         exit(EX_OSERR);
 524                     }
 525                     if (debug)
 526                         warnx("handling signal flag %c", c);
 527                     switch(c) {
 528                     case 'A': /* sigalrm */
 529                         retry();
 530                         break;
 531                     case 'C': /* sigchld */
 532                         reapchild();
 533                         break;
 534                     case 'H': /* sighup */
 535                         config();
 536                         break;
 537                     }
 538                 }
 539             }
 540             for (sep = servtab; n && sep; sep = sep->se_next)
 541                 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
 542                     n--;
 543                     if (debug)
 544                             warnx("someone wants %s", sep->se_service);
 545                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
 546                             i = 1;
 547                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 548                                     syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
 549                             ctrl = accept(sep->se_fd, (struct sockaddr *)0,
 550                                 (socklen_t *)0);
 551                             if (debug)
 552                                     warnx("accept, ctrl %d", ctrl);
 553                             if (ctrl < 0) {
 554                                     if (errno != EINTR)
 555                                             syslog(LOG_WARNING,
 556                                                 "accept (for %s): %m",
 557                                                 sep->se_service);
 558                                       if (sep->se_accept &&
 559                                           sep->se_socktype == SOCK_STREAM)
 560                                               close(ctrl);
 561                                     continue;
 562                             }
 563                             i = 0;
 564                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 565                                     syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
 566                             if (ioctl(ctrl, FIONBIO, &i) < 0)
 567                                     syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
 568                             if (cpmip(sep, ctrl) < 0) {
 569                                 close(ctrl);
 570                                 continue;
 571                             }
 572                     } else
 573                             ctrl = sep->se_fd;
 574                     if (log && !ISWRAP(sep)) {
 575                             char pname[INET6_ADDRSTRLEN] = "unknown";
 576                             socklen_t sl;
 577                             sl = sizeof peermax;
 578                             if (getpeername(ctrl, (struct sockaddr *)
 579                                             &peermax, &sl)) {
 580                                     sl = sizeof peermax;
 581                                     if (recvfrom(ctrl, buf, sizeof(buf),
 582                                         MSG_PEEK,
 583                                         (struct sockaddr *)&peermax,
 584                                         &sl) >= 0) {
 585                                       getnameinfo((struct sockaddr *)&peermax,
 586                                                   peer.sa_len,
 587                                                   pname, sizeof(pname),
 588                                                   NULL, 0,
 589                                                   NI_NUMERICHOST|
 590                                                   NI_WITHSCOPEID);
 591                                     }
 592                             } else {
 593                                     getnameinfo((struct sockaddr *)&peermax,
 594                                                 peer.sa_len,
 595                                                 pname, sizeof(pname),
 596                                                 NULL, 0,
 597                                                 NI_NUMERICHOST|
 598                                                 NI_WITHSCOPEID);
 599                             }
 600                             syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
 601                     }
 602                     (void) sigblock(SIGBLOCK);
 603                     pid = 0;
 604                     /*
 605                      * Fork for all external services, builtins which need to
 606                      * fork and anything we're wrapping (as wrapping might
 607                      * block or use hosts_options(5) twist).
 608                      */
 609                     dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
 610                     if (dofork) {
 611                             if (sep->se_count++ == 0)
 612                                 (void)gettimeofday(&sep->se_time, (struct timezone *)NULL);
 613                             else if (toomany > 0 && sep->se_count >= toomany) {
 614                                 struct timeval now;
 615
 616                                 (void)gettimeofday(&now, (struct timezone *)NULL);
 617                                 if (now.tv_sec - sep->se_time.tv_sec >
 618                                     CNT_INTVL) {
 619                                         sep->se_time = now;
 620                                         sep->se_count = 1;
 621                                 } else {
 622                                         syslog(LOG_ERR,
 623                         "%s/%s server failing (looping), service terminated",
 624                                             sep->se_service, sep->se_proto);
 625                                         if (sep->se_accept &&
 626                                             sep->se_socktype == SOCK_STREAM)
 627                                                 close(ctrl);
 628                                         close_sep(sep);
 629                                         sigsetmask(0L);
 630                                         if (!timingout) {
 631                                                 timingout = 1;
 632                                                 alarm(RETRYTIME);
 633                                         }
 634                                         continue;
 635                                 }
 636                             }
 637                             pid = fork();
 638                     }
 639                     if (pid < 0) {
 640                             syslog(LOG_ERR, "fork: %m");
 641                             if (sep->se_accept &&
 642                                 sep->se_socktype == SOCK_STREAM)
 643                                     close(ctrl);
 644                             sigsetmask(0L);
 645                             sleep(1);
 646                             continue;
 647                     }
 648                     if (pid)
 649                         addchild(sep, pid);
 650                     sigsetmask(0L);
 651                     if (pid == 0) {
 652                             if (dofork) {
 653                                 if (debug)
 654                                         warnx("+ closing from %d", maxsock);
 655                                 for (tmpint = maxsock; tmpint > 2; tmpint--)
 656                                         if (tmpint != ctrl)
 657                                                 (void) close(tmpint);
 658                                 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
 659                                 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
 660                                 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
 661                                 /* SIGPIPE reset before exec */
 662                             }
 663                             /*
 664                              * Call tcpmux to find the real service to exec.
 665                              */
 666                             if (sep->se_bi &&
 667                                 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
 668                                     sep = tcpmux(ctrl);
 669                                     if (sep == NULL) {
 670                                             close(ctrl);
 671                                             _exit(0);
 672                                     }
 673                             }
 674                             if (ISWRAP(sep)) {
 675                                 inetd_setproctitle("wrapping", ctrl);
 676                                 service = sep->se_server_name ?
 677                                     sep->se_server_name : sep->se_service;
 678                                 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL);
 679                                 fromhost(&req);
 680                                 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
 681                                 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
 682                                 denied = !hosts_access(&req);
 683                                 if (denied) {
 684                                     syslog(deny_severity,
 685                                         "refused connection from %.500s, service %s (%s)",
 686                                         eval_client(&req), service, sep->se_proto);
 687                                     if (sep->se_socktype != SOCK_STREAM)
 688                                         recv(ctrl, buf, sizeof (buf), 0);
 689                                     if (dofork) {
 690                                         sleep(1);
 691                                         _exit(0);
 692                                     }
 693                                 }
 694                                 if (log) {
 695                                     syslog(allow_severity,
 696                                         "connection from %.500s, service %s (%s)",
 697                                         eval_client(&req), service, sep->se_proto);
 698                                 }
 699                             }
 700                             if (sep->se_bi) {
 701                                 (*sep->se_bi->bi_fn)(ctrl, sep);
 702                             } else {
 703                                 if (debug)
 704                                         warnx("%d execl %s",
 705                                                 getpid(), sep->se_server);
 706                                 dup2(ctrl, 0);
 707                                 close(ctrl);
 708                                 dup2(0, 1);
 709                                 dup2(0, 2);
 710                                 if ((pwd = getpwnam(sep->se_user)) == NULL) {
 711                                         syslog(LOG_ERR,
 712                                             "%s/%s: %s: no such user",
 713                                                 sep->se_service, sep->se_proto,
 714                                                 sep->se_user);
 715                                         if (sep->se_socktype != SOCK_STREAM)
 716                                                 recv(0, buf, sizeof (buf), 0);
 717                                         _exit(EX_NOUSER);
 718                                 }
 719                                 grp = NULL;
 720                                 if (   sep->se_group != NULL
 721                                     && (grp = getgrnam(sep->se_group)) == NULL
 722                                    ) {
 723                                         syslog(LOG_ERR,
 724                                             "%s/%s: %s: no such group",
 725                                                 sep->se_service, sep->se_proto,
 726                                                 sep->se_group);
 727                                         if (sep->se_socktype != SOCK_STREAM)
 728                                                 recv(0, buf, sizeof (buf), 0);
 729                                         _exit(EX_NOUSER);
 730                                 }
 731                                 if (grp != NULL)
 732                                         pwd->pw_gid = grp->gr_gid;
 733 #ifdef LOGIN_CAP
 734                                 if ((lc = login_getclass(sep->se_class)) == NULL) {
 735                                         /* error syslogged by getclass */
 736                                         syslog(LOG_ERR,
 737                                             "%s/%s: %s: login class error",
 738                                                 sep->se_service, sep->se_proto,
 739                                                 sep->se_class);
 740                                         if (sep->se_socktype != SOCK_STREAM)
 741                                                 recv(0, buf, sizeof (buf), 0);
 742                                         _exit(EX_NOUSER);
 743                                 }
 744 #endif
 745                                 if (setsid() < 0) {
 746                                         syslog(LOG_ERR,
 747                                                 "%s: can't setsid(): %m",
 748                                                  sep->se_service);
 749                                         /* _exit(EX_OSERR); not fatal yet */
 750                                 }
 751 #ifdef LOGIN_CAP
 752                                 if (setusercontext(lc, pwd, pwd->pw_uid,
 753                                     LOGIN_SETALL) != 0) {
 754                                         syslog(LOG_ERR,
 755                                          "%s: can't setusercontext(..%s..): %m",
 756                                          sep->se_service, sep->se_user);
 757                                         _exit(EX_OSERR);
 758                                 }
 759 #else
 760                                 if (pwd->pw_uid) {
 761                                         if (setlogin(sep->se_user) < 0) {
 762                                                 syslog(LOG_ERR,
 763                                                  "%s: can't setlogin(%s): %m",
 764                                                  sep->se_service, sep->se_user);
 765                                                 /* _exit(EX_OSERR); not yet */
 766                                         }
 767                                         if (setgid(pwd->pw_gid) < 0) {
 768                                                 syslog(LOG_ERR,
 769                                                   "%s: can't set gid %d: %m",
 770                                                   sep->se_service, pwd->pw_gid);
 771                                                 _exit(EX_OSERR);
 772                                         }
 773                                         (void) initgroups(pwd->pw_name,
 774                                                         pwd->pw_gid);
 775                                         if (setuid(pwd->pw_uid) < 0) {
 776                                                 syslog(LOG_ERR,
 777                                                   "%s: can't set uid %d: %m",
 778                                                   sep->se_service, pwd->pw_uid);
 779                                                 _exit(EX_OSERR);
 780                                         }
 781                                 }
 782 #endif
 783                                 sigaction(SIGPIPE, &sapipe,
 784                                     (struct sigaction *)0);
 785                                 execv(sep->se_server, sep->se_argv);
 786                                 syslog(LOG_ERR,
 787                                     "cannot execute %s: %m", sep->se_server);
 788                                 if (sep->se_socktype != SOCK_STREAM)
 789                                         recv(0, buf, sizeof (buf), 0);
 790                             }
 791                             if (dofork)
 792                                 _exit(0);
 793                     }
 794                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
 795                             close(ctrl);
 796                 }
 797         }
 798 }
 799
 800 /*
 801  * Add a signal flag to the signal flag queue for later handling
 802  */
 803
 804 void
 805 flag_signal(c)
 806         int c;
 807 {
 808         char ch = c;
 809
 810         if (write(signalpipe[1], &ch, 1) != 1) {
 811                 syslog(LOG_ERR, "write: %m");
 812                 _exit(EX_OSERR);
 813         }
 814 }
 815
 816 /*
 817  * Record a new child pid for this service. If we've reached the
 818  * limit on children, then stop accepting incoming requests.
 819  */
 820
 821 void
 822 addchild(struct servtab *sep, pid_t pid)
 823 {
 824         if (sep->se_maxchild <= 0)
 825                 return;
 826 #ifdef SANITY_CHECK
 827         if (sep->se_numchild >= sep->se_maxchild) {
 828                 syslog(LOG_ERR, "%s: %d >= %d",
 829                     __FUNCTION__, sep->se_numchild, sep->se_maxchild);
 830                 exit(EX_SOFTWARE);
 831         }
 832 #endif
 833         sep->se_pids[sep->se_numchild++] = pid;
 834         if (sep->se_numchild == sep->se_maxchild)
 835                 disable(sep);
 836 }
 837
 838 /*
 839  * Some child process has exited. See if it's on somebody's list.
 840  */
 841
 842 void
 843 flag_reapchild(signo)
 844         int signo __unused;
 845 {
 846         flag_signal('C');
 847 }
 848
 849 void
 850 reapchild()
 851 {
 852         int k, status;
 853         pid_t pid;
 854         struct servtab *sep;
 855
 856         for (;;) {
 857                 pid = wait3(&status, WNOHANG, (struct rusage *)0);
 858                 if (pid <= 0)
 859                         break;
 860                 if (debug)
 861                         warnx("%d reaped, status %#x", pid, status);
 862                 for (sep = servtab; sep; sep = sep->se_next) {
 863                         for (k = 0; k < sep->se_numchild; k++)
 864                                 if (sep->se_pids[k] == pid)
 865                                         break;
 866                         if (k == sep->se_numchild)
 867                                 continue;
 868                         if (sep->se_numchild == sep->se_maxchild)
 869                                 enable(sep);
 870                         sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
 871                         if (status)
 872                                 syslog(LOG_WARNING,
 873                                     "%s[%d]: exit status 0x%x",
 874                                     sep->se_server, pid, status);
 875                         break;
 876                 }
 877         }
 878 }
 879
 880 void
 881 flag_config(signo)
 882         int signo __unused;
 883 {
 884         flag_signal('H');
 885 }
 886
 887 void
 888 config()
 889 {
 890         struct servtab *sep, *new, **sepp;
 891         long omask;
 892
 893         if (!setconfig()) {
 894                 syslog(LOG_ERR, "%s: %m", CONFIG);
 895                 return;
 896         }
 897         for (sep = servtab; sep; sep = sep->se_next)
 898                 sep->se_checked = 0;
 899         while ((new = getconfigent())) {
 900                 if (getpwnam(new->se_user) == NULL) {
 901                         syslog(LOG_ERR,
 902                                 "%s/%s: no such user '%s', service ignored",
 903                                 new->se_service, new->se_proto, new->se_user);
 904                         continue;
 905                 }
 906                 if (new->se_group && getgrnam(new->se_group) == NULL) {
 907                         syslog(LOG_ERR,
 908                                 "%s/%s: no such group '%s', service ignored",
 909                                 new->se_service, new->se_proto, new->se_group);
 910                         continue;
 911                 }
 912 #ifdef LOGIN_CAP
 913                 if (login_getclass(new->se_class) == NULL) {
 914                         /* error syslogged by getclass */
 915                         syslog(LOG_ERR,
 916                                 "%s/%s: %s: login class error, service ignored",
 917                                 new->se_service, new->se_proto, new->se_class);
 918                         continue;
 919                 }
 920 #endif
 921                 for (sep = servtab; sep; sep = sep->se_next)
 922                         if (strcmp(sep->se_service, new->se_service) == 0 &&
 923                             strcmp(sep->se_proto, new->se_proto) == 0 &&
 924                             sep->se_socktype == new->se_socktype &&
 925                             sep->se_family == new->se_family)
 926                                 break;
 927                 if (sep != 0) {
 928                         int i;
 929
 930 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; }
 931                         omask = sigblock(SIGBLOCK);
 932                         if (sep->se_nomapped != new->se_nomapped) {
 933                                 sep->se_nomapped = new->se_nomapped;
 934                                 sep->se_reset = 1;
 935                         }
 936                         /* copy over outstanding child pids */
 937                         if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
 938                                 new->se_numchild = sep->se_numchild;
 939                                 if (new->se_numchild > new->se_maxchild)
 940                                         new->se_numchild = new->se_maxchild;
 941                                 memcpy(new->se_pids, sep->se_pids,
 942                                     new->se_numchild * sizeof(*new->se_pids));
 943                         }
 944                         SWAP(sep->se_pids, new->se_pids);
 945                         sep->se_maxchild = new->se_maxchild;
 946                         sep->se_numchild = new->se_numchild;
 947                         sep->se_maxcpm = new->se_maxcpm;
 948                         sep->se_bi = new->se_bi;
 949                         /* might need to turn on or off service now */
 950                         if (sep->se_fd >= 0) {
 951                               if (sep->se_maxchild > 0
 952                                   && sep->se_numchild == sep->se_maxchild) {
 953                                       if (FD_ISSET(sep->se_fd, &allsock))
 954                                           disable(sep);
 955                               } else {
 956                                       if (!FD_ISSET(sep->se_fd, &allsock))
 957                                           enable(sep);
 958                               }
 959                         }
 960                         sep->se_accept = new->se_accept;
 961                         SWAP(sep->se_user, new->se_user);
 962                         SWAP(sep->se_group, new->se_group);
 963 #ifdef LOGIN_CAP
 964                         SWAP(sep->se_class, new->se_class);
 965 #endif
 966                         SWAP(sep->se_server, new->se_server);
 967                         SWAP(sep->se_server_name, new->se_server_name);
 968                         for (i = 0; i < MAXARGV; i++)
 969                                 SWAP(sep->se_argv[i], new->se_argv[i]);
 970 #ifdef IPSEC
 971                         SWAP(sep->se_policy, new->se_policy);
 972                         ipsecsetup(sep);
 973 #endif
 974                         sigsetmask(omask);
 975                         freeconfig(new);
 976                         if (debug)
 977                                 print_service("REDO", sep);
 978                 } else {
 979                         sep = enter(new);
 980                         if (debug)
 981                                 print_service("ADD ", sep);
 982                 }
 983                 sep->se_checked = 1;
 984                 if (ISMUX(sep)) {
 985                         sep->se_fd = -1;
 986                         continue;
 987                 }
 988                 switch (sep->se_family) {
 989                 case AF_INET:
 990                         if (no_v4bind != 0) {
 991                                 sep->se_fd = -1;
 992                                 continue;
 993                         }
 994                         break;
 995 #ifdef INET6
 996                 case AF_INET6:
 997                         if (no_v6bind != 0) {
 998                                 sep->se_fd = -1;
 999                                 continue;
1000                         }
1001                         break;
1002 #endif
1003                 }
1004                 if (!sep->se_rpc) {
1005                         if (sep->se_family != AF_UNIX) {
1006                                 sp = getservbyname(sep->se_service, sep->se_proto);
1007                                 if (sp == 0) {
1008                                         syslog(LOG_ERR, "%s/%s: unknown service",
1009                                         sep->se_service, sep->se_proto);
1010                                         sep->se_checked = 0;
1011                                         continue;
1012                                 }
1013                         }
1014                         switch (sep->se_family) {
1015                         case AF_INET:
1016                                 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1017                                         sep->se_ctrladdr4.sin_port =
1018                                                 sp->s_port;
1019                                         sep->se_reset = 1;
1020                                 }
1021                                 break;
1022 #ifdef INET6
1023                         case AF_INET6:
1024                                 if (sp->s_port !=
1025                                     sep->se_ctrladdr6.sin6_port) {
1026                                         sep->se_ctrladdr6.sin6_port =
1027                                                 sp->s_port;
1028                                         sep->se_reset = 1;
1029                                 }
1030                                 break;
1031 #endif
1032                         }
1033                         if (sep->se_reset != 0 && sep->se_fd >= 0)
1034                                 close_sep(sep);
1035                 } else {
1036                         rpc = getrpcbyname(sep->se_service);
1037                         if (rpc == 0) {
1038                                 syslog(LOG_ERR, "%s/%s unknown RPC service",
1039                                         sep->se_service, sep->se_proto);
1040                                 if (sep->se_fd != -1)
1041                                         (void) close(sep->se_fd);
1042                                 sep->se_fd = -1;
1043                                         continue;
1044                         }
1045                         if (rpc->r_number != sep->se_rpc_prog) {
1046                                 if (sep->se_rpc_prog)
1047                                         unregisterrpc(sep);
1048                                 sep->se_rpc_prog = rpc->r_number;
1049                                 if (sep->se_fd != -1)
1050                                         (void) close(sep->se_fd);
1051                                 sep->se_fd = -1;
1052                         }
1053                 }
1054                 if (sep->se_fd == -1)
1055                         setup(sep);
1056         }
1057         endconfig();
1058         /*
1059          * Purge anything not looked at above.
1060          */
1061         omask = sigblock(SIGBLOCK);
1062         sepp = &servtab;
1063         while ((sep = *sepp)) {
1064                 if (sep->se_checked) {
1065                         sepp = &sep->se_next;
1066                         continue;
1067                 }
1068                 *sepp = sep->se_next;
1069                 if (sep->se_fd >= 0)
1070                         close_sep(sep);
1071                 if (debug)
1072                         print_service("FREE", sep);
1073                 if (sep->se_rpc && sep->se_rpc_prog > 0)
1074                         unregisterrpc(sep);
1075                 freeconfig(sep);
1076                 free(sep);
1077         }
1078         (void) sigsetmask(omask);
1079 }
1080
1081 void
1082 unregisterrpc(sep)
1083         struct servtab *sep;
1084 {
1085         u_int i;
1086         struct servtab *sepp;
1087         long omask;
1088
1089         omask = sigblock(SIGBLOCK);
1090         for (sepp = servtab; sepp; sepp = sepp->se_next) {
1091                 if (sepp == sep)
1092                         continue;
1093                 if (sep->se_checked == 0 ||
1094                     !sepp->se_rpc ||
1095                     sep->se_rpc_prog != sepp->se_rpc_prog)
1096                         continue;
1097                 return;
1098         }
1099         if (debug)
1100                 print_service("UNREG", sep);
1101         for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++)
1102                 pmap_unset(sep->se_rpc_prog, i);
1103         if (sep->se_fd != -1)
1104                 (void) close(sep->se_fd);
1105         sep->se_fd = -1;
1106         (void) sigsetmask(omask);
1107 }
1108
1109 void
1110 flag_retry(signo)
1111         int signo __unused;
1112 {
1113         flag_signal('A');
1114 }
1115
1116 void
1117 retry()
1118 {
1119         struct servtab *sep;
1120
1121         timingout = 0;
1122         for (sep = servtab; sep; sep = sep->se_next)
1123                 if (sep->se_fd == -1 && !ISMUX(sep))
1124                         setup(sep);
1125 }
1126
1127 void
1128 setup(sep)
1129         struct servtab *sep;
1130 {
1131         int on = 1;
1132
1133         if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1134                 if (debug)
1135                         warn("socket failed on %s/%s",
1136                                 sep->se_service, sep->se_proto);
1137                 syslog(LOG_ERR, "%s/%s: socket: %m",
1138                     sep->se_service, sep->se_proto);
1139                 return;
1140         }
1141 #define turnon(fd, opt) \
1142 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1143         if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1144             turnon(sep->se_fd, SO_DEBUG) < 0)
1145                 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1146         if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1147                 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1148 #ifdef SO_PRIVSTATE
1149         if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1150                 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1151 #endif
1152         /* tftpd opens a new connection then needs more infos */
1153         if ((sep->se_family == AF_INET6) &&
1154             (strcmp(sep->se_proto, "udp") == 0) &&
1155             (sep->se_accept == 0) &&
1156             (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO,
1157                         (char *)&on, sizeof (on)) < 0))
1158                 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1159 #ifdef IPV6_BINDV6ONLY
1160         if (sep->se_family == AF_INET6) {
1161                 int flag = sep->se_nomapped ? 1 : 0;
1162                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_BINDV6ONLY,
1163                                (char *)&flag, sizeof (flag)) < 0)
1164                         syslog(LOG_ERR, "setsockopt (IPV6_BINDV6ONLY): %m");
1165         }
1166 #endif /* IPV6_BINDV6ONLY */
1167 #undef turnon
1168         if (sep->se_type == TTCP_TYPE)
1169                 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH,
1170                     (char *)&on, sizeof (on)) < 0)
1171                         syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m");
1172 #ifdef IPV6_FAITH
1173         if (sep->se_type == FAITH_TYPE) {
1174                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on,
1175                                 sizeof(on)) < 0) {
1176                         syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m");
1177                 }
1178         }
1179 #endif
1180 #ifdef IPSEC
1181         ipsecsetup(sep);
1182 #endif
1183         if (sep->se_family == AF_UNIX) {
1184                 (void) unlink(sep->se_ctrladdr_un.sun_path);
1185                 umask(0777); /* Make socket with conservative permissions */
1186         }
1187         if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1188             sep->se_ctrladdr_size) < 0) {
1189                 if (debug)
1190                         warn("bind failed on %s/%s",
1191                                 sep->se_service, sep->se_proto);
1192                 syslog(LOG_ERR, "%s/%s: bind: %m",
1193                     sep->se_service, sep->se_proto);
1194                 (void) close(sep->se_fd);
1195                 sep->se_fd = -1;
1196                 if (!timingout) {
1197                         timingout = 1;
1198                         alarm(RETRYTIME);
1199                 }
1200                 if (sep->se_family == AF_UNIX)
1201                         umask(mask);
1202                 return;
1203         }
1204         if (sep->se_family == AF_UNIX) {
1205                 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1206                 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1207                         syslog(LOG_ERR, "chown socket: %m");
1208                 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1209                         syslog(LOG_ERR, "chmod socket: %m");
1210                 umask(mask);
1211         }
1212         if (sep->se_rpc) {
1213                 u_int i;
1214                 socklen_t len = sep->se_ctrladdr_size;
1215
1216                 if (sep->se_family != AF_INET) {
1217                         syslog(LOG_ERR,
1218                                "%s/%s: unsupported address family for rpc",
1219                                sep->se_service, sep->se_proto);
1220                         (void) close(sep->se_fd);
1221                         sep->se_fd = -1;
1222                         return;
1223                 }
1224                 if (getsockname(sep->se_fd,
1225                                 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1226                         syslog(LOG_ERR, "%s/%s: getsockname: %m",
1227                                sep->se_service, sep->se_proto);
1228                         (void) close(sep->se_fd);
1229                         sep->se_fd = -1;
1230                         return;
1231                 }
1232                 if (debug)
1233                         print_service("REG ", sep);
1234                 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1235                         pmap_unset(sep->se_rpc_prog, i);
1236                         pmap_set(sep->se_rpc_prog, i,
1237                                  (sep->se_socktype == SOCK_DGRAM)
1238                                  ? IPPROTO_UDP : IPPROTO_TCP,
1239                                  ntohs(sep->se_ctrladdr4.sin_port));
1240                 }
1241         }
1242         if (sep->se_socktype == SOCK_STREAM)
1243                 listen(sep->se_fd, 64);
1244         enable(sep);
1245         if (debug) {
1246                 warnx("registered %s on %d",
1247                         sep->se_server, sep->se_fd);
1248         }
1249 }
1250
1251 #ifdef IPSEC
1252 void
1253 ipsecsetup(sep)
1254         struct servtab *sep;
1255 {
1256         char *buf;
1257         char *policy_in = NULL;
1258         char *policy_out = NULL;
1259         int level;
1260         int opt;
1261
1262         switch (sep->se_family) {
1263         case AF_INET:
1264                 level = IPPROTO_IP;
1265                 opt = IP_IPSEC_POLICY;
1266                 break;
1267 #ifdef INET6
1268         case AF_INET6:
1269                 level = IPPROTO_IPV6;
1270                 opt = IPV6_IPSEC_POLICY;
1271                 break;
1272 #endif
1273         default:
1274                 return;
1275         }
1276
1277         if (!sep->se_policy || sep->se_policy[0] == '\0') {
1278                 static char def_in[] = "in entrust", def_out[] = "out entrust";
1279                 policy_in = def_in;
1280                 policy_out = def_out;
1281         } else {
1282                 if (!strncmp("in", sep->se_policy, 2))
1283                         policy_in = sep->se_policy;
1284                 else if (!strncmp("out", sep->se_policy, 3))
1285                         policy_out = sep->se_policy;
1286                 else {
1287                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1288                                 sep->se_policy);
1289                         return;
1290                 }
1291         }
1292
1293         if (policy_in != NULL) {
1294                 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1295                 if (buf != NULL) {
1296                         if (setsockopt(sep->se_fd, level, opt,
1297                                         buf, ipsec_get_policylen(buf)) < 0 &&
1298                             debug != 0)
1299                                 warnx("%s/%s: ipsec initialization failed; %s",
1300                                       sep->se_service, sep->se_proto,
1301                                       policy_in);
1302                         free(buf);
1303                 } else
1304                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1305                                 policy_in);
1306         }
1307         if (policy_out != NULL) {
1308                 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1309                 if (buf != NULL) {
1310                         if (setsockopt(sep->se_fd, level, opt,
1311                                         buf, ipsec_get_policylen(buf)) < 0 &&
1312                             debug != 0)
1313                                 warnx("%s/%s: ipsec initialization failed; %s",
1314                                       sep->se_service, sep->se_proto,
1315                                       policy_out);
1316                         free(buf);
1317                 } else
1318                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1319                                 policy_out);
1320         }
1321 }
1322 #endif
1323
1324 /*
1325  * Finish with a service and its socket.
1326  */
1327 void
1328 close_sep(sep)
1329         struct servtab *sep;
1330 {
1331         if (sep->se_fd >= 0) {
1332                 if (FD_ISSET(sep->se_fd, &allsock))
1333                         disable(sep);
1334                 (void) close(sep->se_fd);
1335                 sep->se_fd = -1;
1336         }
1337         sep->se_count = 0;
1338         sep->se_numchild = 0;   /* forget about any existing children */
1339 }
1340
1341 int
1342 matchservent(name1, name2, proto)
1343         const char *name1, *name2, *proto;
1344 {
1345         char **alias, *p;
1346         struct servent *se;
1347
1348         if (strcmp(proto, "unix") == 0) {
1349                 if ((p = strrchr(name1, '/')) != NULL)
1350                         name1 = p + 1;
1351                 if ((p = strrchr(name2, '/')) != NULL)
1352                         name2 = p + 1;
1353         }
1354         if (strcmp(name1, name2) == 0)
1355                 return(1);
1356         if ((se = getservbyname(name1, proto)) != NULL) {
1357                 if (strcmp(name2, se->s_name) == 0)
1358                         return(1);
1359                 for (alias = se->s_aliases; *alias; alias++)
1360                         if (strcmp(name2, *alias) == 0)
1361                                 return(1);
1362         }
1363         return(0);
1364 }
1365
1366 struct servtab *
1367 enter(cp)
1368         struct servtab *cp;
1369 {
1370         struct servtab *sep;
1371         long omask;
1372
1373         sep = (struct servtab *)malloc(sizeof (*sep));
1374         if (sep == (struct servtab *)0) {
1375                 syslog(LOG_ERR, "malloc: %m");
1376                 exit(EX_OSERR);
1377         }
1378         *sep = *cp;
1379         sep->se_fd = -1;
1380         omask = sigblock(SIGBLOCK);
1381         sep->se_next = servtab;
1382         servtab = sep;
1383         sigsetmask(omask);
1384         return (sep);
1385 }
1386
1387 void
1388 enable(sep)
1389         struct servtab *sep;
1390 {
1391         if (debug)
1392                 warnx(
1393                     "enabling %s, fd %d", sep->se_service, sep->se_fd);
1394 #ifdef SANITY_CHECK
1395         if (sep->se_fd < 0) {
1396                 syslog(LOG_ERR,
1397                     "%s: %s: bad fd", __FUNCTION__, sep->se_service);
1398                 exit(EX_SOFTWARE);
1399         }
1400         if (ISMUX(sep)) {
1401                 syslog(LOG_ERR,
1402                     "%s: %s: is mux", __FUNCTION__, sep->se_service);
1403                 exit(EX_SOFTWARE);
1404         }
1405         if (FD_ISSET(sep->se_fd, &allsock)) {
1406                 syslog(LOG_ERR,
1407                     "%s: %s: not off", __FUNCTION__, sep->se_service);
1408                 exit(EX_SOFTWARE);
1409         }
1410         nsock++;
1411 #endif
1412         FD_SET(sep->se_fd, &allsock);
1413         if (sep->se_fd > maxsock)
1414                 maxsock = sep->se_fd;
1415 }
1416
1417 void
1418 disable(sep)
1419         struct servtab *sep;
1420 {
1421         if (debug)
1422                 warnx(
1423                     "disabling %s, fd %d", sep->se_service, sep->se_fd);
1424 #ifdef SANITY_CHECK
1425         if (sep->se_fd < 0) {
1426                 syslog(LOG_ERR,
1427                     "%s: %s: bad fd", __FUNCTION__, sep->se_service);
1428                 exit(EX_SOFTWARE);
1429         }
1430         if (ISMUX(sep)) {
1431                 syslog(LOG_ERR,
1432                     "%s: %s: is mux", __FUNCTION__, sep->se_service);
1433                 exit(EX_SOFTWARE);
1434         }
1435         if (!FD_ISSET(sep->se_fd, &allsock)) {
1436                 syslog(LOG_ERR,
1437                     "%s: %s: not on", __FUNCTION__, sep->se_service);
1438                 exit(EX_SOFTWARE);
1439         }
1440         if (nsock == 0) {
1441                 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__);
1442                 exit(EX_SOFTWARE);
1443         }
1444         nsock--;
1445 #endif
1446         FD_CLR(sep->se_fd, &allsock);
1447         if (sep->se_fd == maxsock)
1448                 maxsock--;
1449 }
1450
1451 FILE    *fconfig = NULL;
1452 struct  servtab serv;
1453 char    line[LINE_MAX];
1454
1455 int
1456 setconfig()
1457 {
1458
1459         if (fconfig != NULL) {
1460                 fseek(fconfig, 0L, SEEK_SET);
1461                 return (1);
1462         }
1463         fconfig = fopen(CONFIG, "r");
1464         return (fconfig != NULL);
1465 }
1466
1467 void
1468 endconfig()
1469 {
1470         if (fconfig) {
1471                 (void) fclose(fconfig);
1472                 fconfig = NULL;
1473         }
1474 }
1475
1476 struct servtab *
1477 getconfigent()
1478 {
1479         struct servtab *sep = &serv;
1480         int argc;
1481         char *cp, *arg, *s;
1482         char *versp;
1483         static char TCPMUX_TOKEN[] = "tcpmux/";
1484 #define MUX_LEN         (sizeof(TCPMUX_TOKEN)-1)
1485 #ifdef IPSEC
1486         char *policy = NULL;
1487 #endif
1488         int v4bind = 0;
1489 #ifdef INET6
1490         int v6bind = 0;
1491 #endif
1492
1493 more:
1494         while ((cp = nextline(fconfig)) != NULL) {
1495 #ifdef IPSEC
1496                 /* lines starting with #@ is not a comment, but the policy */
1497                 if (cp[0] == '#' && cp[1] == '@') {
1498                         char *p;
1499                         for (p = cp + 2; p && *p && isspace(*p); p++)
1500                                 ;
1501                         if (*p == '\0') {
1502                                 if (policy)
1503                                         free(policy);
1504                                 policy = NULL;
1505                         } else if (ipsec_get_policylen(p) >= 0) {
1506                                 if (policy)
1507                                         free(policy);
1508                                 policy = newstr(p);
1509                         } else {
1510                                 syslog(LOG_ERR,
1511                                         "%s: invalid ipsec policy \"%s\"",
1512                                         CONFIG, p);
1513                                 exit(EX_CONFIG);
1514                         }
1515                 }
1516 #endif
1517                 if (*cp == '#' || *cp == '\0')
1518                         continue;
1519                 break;
1520         }
1521         if (cp == NULL)
1522                 return ((struct servtab *)0);
1523         /*
1524          * clear the static buffer, since some fields (se_ctrladdr,
1525          * for example) don't get initialized here.
1526          */
1527         memset(sep, 0, sizeof *sep);
1528         arg = skip(&cp);
1529         if (cp == NULL) {
1530                 /* got an empty line containing just blanks/tabs. */
1531                 goto more;
1532         }
1533         if (arg[0] == ':') { /* :user:group:perm: */
1534                 char *user, *group, *perm;
1535                 struct passwd *pw;
1536                 struct group *gr;
1537                 user = arg+1;
1538                 if ((group = strchr(user, ':')) == NULL) {
1539                         syslog(LOG_ERR, "no group after user '%s'", user);
1540                         goto more;
1541                 }
1542                 *group++ = '\0';
1543                 if ((perm = strchr(group, ':')) == NULL) {
1544                         syslog(LOG_ERR, "no mode after group '%s'", group);
1545                         goto more;
1546                 }
1547                 *perm++ = '\0';
1548                 if ((pw = getpwnam(user)) == NULL) {
1549                         syslog(LOG_ERR, "no such user '%s'", user);
1550                         goto more;
1551                 }
1552                 sep->se_sockuid = pw->pw_uid;
1553                 if ((gr = getgrnam(group)) == NULL) {
1554                         syslog(LOG_ERR, "no such user '%s'", group);
1555                         goto more;
1556                 }
1557                 sep->se_sockgid = gr->gr_gid;
1558                 sep->se_sockmode = strtol(perm, &arg, 8);
1559                 if (*arg != ':') {
1560                         syslog(LOG_ERR, "bad mode '%s'", perm);
1561                         goto more;
1562                 }
1563                 *arg++ = '\0';
1564         } else {
1565                 sep->se_sockuid = euid;
1566                 sep->se_sockgid = egid;
1567                 sep->se_sockmode = 0200;
1568         }
1569         if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1570                 char *c = arg + MUX_LEN;
1571                 if (*c == '+') {
1572                         sep->se_type = MUXPLUS_TYPE;
1573                         c++;
1574                 } else
1575                         sep->se_type = MUX_TYPE;
1576                 sep->se_service = newstr(c);
1577         } else {
1578                 sep->se_service = newstr(arg);
1579                 sep->se_type = NORM_TYPE;
1580         }
1581         arg = sskip(&cp);
1582         if (strcmp(arg, "stream") == 0)
1583                 sep->se_socktype = SOCK_STREAM;
1584         else if (strcmp(arg, "dgram") == 0)
1585                 sep->se_socktype = SOCK_DGRAM;
1586         else if (strcmp(arg, "rdm") == 0)
1587                 sep->se_socktype = SOCK_RDM;
1588         else if (strcmp(arg, "seqpacket") == 0)
1589                 sep->se_socktype = SOCK_SEQPACKET;
1590         else if (strcmp(arg, "raw") == 0)
1591                 sep->se_socktype = SOCK_RAW;
1592         else
1593                 sep->se_socktype = -1;
1594
1595         arg = sskip(&cp);
1596         if (strncmp(arg, "tcp", 3) == 0) {
1597                 sep->se_proto = newstr(strsep(&arg, "/"));
1598                 if (arg != NULL) {
1599                         if (strcmp(arg, "ttcp") == 0)
1600                                 sep->se_type = TTCP_TYPE;
1601                         else if (strcmp(arg, "faith") == 0)
1602                                 sep->se_type = FAITH_TYPE;
1603                 }
1604         } else {
1605                 if (sep->se_type == NORM_TYPE &&
1606                     strncmp(arg, "faith/", 6) == 0) {
1607                         arg += 6;
1608                         sep->se_type = FAITH_TYPE;
1609                 }
1610                 sep->se_proto = newstr(arg);
1611         }
1612         if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1613                 if (no_v4bind != 0) {
1614                         syslog(LOG_INFO, "IPv4 bind is ignored for %s",
1615                                sep->se_service);
1616                         freeconfig(sep);
1617                         goto more;
1618                 }
1619                 memmove(sep->se_proto, sep->se_proto + 4,
1620                     strlen(sep->se_proto) + 1 - 4);
1621                 sep->se_rpc = 1;
1622                 sep->se_rpc_prog = sep->se_rpc_lowvers =
1623                         sep->se_rpc_lowvers = 0;
1624                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1625                        sizeof(sep->se_ctrladdr4));
1626                 if ((versp = rindex(sep->se_service, '/'))) {
1627                         *versp++ = '\0';
1628                         switch (sscanf(versp, "%d-%d",
1629                                        &sep->se_rpc_lowvers,
1630                                        &sep->se_rpc_highvers)) {
1631                         case 2:
1632                                 break;
1633                         case 1:
1634                                 sep->se_rpc_highvers =
1635                                         sep->se_rpc_lowvers;
1636                                 break;
1637                         default:
1638                                 syslog(LOG_ERR,
1639                                         "bad RPC version specifier; %s",
1640                                         sep->se_service);
1641                                 freeconfig(sep);
1642                                 goto more;
1643                         }
1644                 }
1645                 else {
1646                         sep->se_rpc_lowvers =
1647                                 sep->se_rpc_highvers = 1;
1648                 }
1649         }
1650         sep->se_nomapped = 0;
1651         while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1652 #ifdef INET6
1653                 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1654                         if (no_v6bind != 0) {
1655                                 syslog(LOG_INFO, "IPv6 bind is ignored for %s",
1656                                        sep->se_service);
1657                                 freeconfig(sep);
1658                                 goto more;
1659                         }
1660                         sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1661                         v6bind = 1;
1662                         continue;
1663                 }
1664 #endif
1665                 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1666                         sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1667                         v4bind = 1;
1668                         continue;
1669                 }
1670                 /* illegal version num */
1671                 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1672                 freeconfig(sep);
1673                 goto more;
1674         }
1675         if (strcmp(sep->se_proto, "unix") == 0) {
1676                 sep->se_family = AF_UNIX;
1677         } else
1678 #ifdef INET6
1679         if (v6bind != 0) {
1680                 sep->se_family = AF_INET6;
1681                 if (v4bind == 0 || no_v4bind != 0)
1682                         sep->se_nomapped = 1;
1683         } else
1684 #endif
1685         { /* default to v4 bind if not v6 bind */
1686                 if (no_v4bind != 0) {
1687                         syslog(LOG_INFO, "IPv4 bind is ignored for %s",
1688                                sep->se_service);
1689                         freeconfig(sep);
1690                         goto more;
1691                 }
1692                 sep->se_family = AF_INET;
1693         }
1694         /* init ctladdr */
1695         switch(sep->se_family) {
1696         case AF_INET:
1697                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1698                        sizeof(sep->se_ctrladdr4));
1699                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1700                 break;
1701 #ifdef INET6
1702         case AF_INET6:
1703                 memcpy(&sep->se_ctrladdr6, bind_sa6,
1704                        sizeof(sep->se_ctrladdr6));
1705                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1706                 break;
1707 #endif
1708         case AF_UNIX:
1709                 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1710                         syslog(LOG_ERR,
1711                             "domain socket pathname too long for service %s",
1712                             sep->se_service);
1713                         goto more;
1714                 }
1715                 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1716                 sep->se_ctrladdr_un.sun_family = sep->se_family;
1717                 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1718                 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1719                 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1720         }
1721         arg = sskip(&cp);
1722         if (!strncmp(arg, "wait", 4))
1723                 sep->se_accept = 0;
1724         else if (!strncmp(arg, "nowait", 6))
1725                 sep->se_accept = 1;
1726         else {
1727                 syslog(LOG_ERR,
1728                         "%s: bad wait/nowait for service %s",
1729                         CONFIG, sep->se_service);
1730                 goto more;
1731         }
1732         sep->se_maxchild = -1;
1733         sep->se_maxcpm = -1;
1734         if ((s = strchr(arg, '/')) != NULL) {
1735                 char *eptr;
1736                 u_long val;
1737
1738                 val = strtoul(s + 1, &eptr, 10);
1739                 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1740                         syslog(LOG_ERR,
1741                                 "%s: bad max-child for service %s",
1742                                 CONFIG, sep->se_service);
1743                         goto more;
1744                 }
1745                 if (debug)
1746                         if (!sep->se_accept && val != 1)
1747                                 warnx("maxchild=%lu for wait service %s"
1748                                     " not recommended", val, sep->se_service);
1749                 sep->se_maxchild = val;
1750                 if (*eptr == '/')
1751                         sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1752                 /*
1753                  * explicitly do not check for \0 for future expansion /
1754                  * backwards compatibility
1755                  */
1756         }
1757         if (ISMUX(sep)) {
1758                 /*
1759                  * Silently enforce "nowait" mode for TCPMUX services
1760                  * since they don't have an assigned port to listen on.
1761                  */
1762                 sep->se_accept = 1;
1763                 if (strcmp(sep->se_proto, "tcp")) {
1764                         syslog(LOG_ERR,
1765                                 "%s: bad protocol for tcpmux service %s",
1766                                 CONFIG, sep->se_service);
1767                         goto more;
1768                 }
1769                 if (sep->se_socktype != SOCK_STREAM) {
1770                         syslog(LOG_ERR,
1771                                 "%s: bad socket type for tcpmux service %s",
1772                                 CONFIG, sep->se_service);
1773                         goto more;
1774                 }
1775         }
1776         sep->se_user = newstr(sskip(&cp));
1777 #ifdef LOGIN_CAP
1778         if ((s = strrchr(sep->se_user, '/')) != NULL) {
1779                 *s = '\0';
1780                 sep->se_class = newstr(s + 1);
1781         } else
1782                 sep->se_class = newstr(RESOURCE_RC);
1783 #endif
1784         if ((s = strrchr(sep->se_user, ':')) != NULL) {
1785                 *s = '\0';
1786                 sep->se_group = newstr(s + 1);
1787         } else
1788                 sep->se_group = NULL;
1789         sep->se_server = newstr(sskip(&cp));
1790         if ((sep->se_server_name = rindex(sep->se_server, '/')))
1791                 sep->se_server_name++;
1792         if (strcmp(sep->se_server, "internal") == 0) {
1793                 struct biltin *bi;
1794
1795                 for (bi = biltins; bi->bi_service; bi++)
1796                         if (bi->bi_socktype == sep->se_socktype &&
1797                             matchservent(bi->bi_service, sep->se_service,
1798                             sep->se_proto))
1799                                 break;
1800                 if (bi->bi_service == 0) {
1801                         syslog(LOG_ERR, "internal service %s unknown",
1802                                 sep->se_service);
1803                         goto more;
1804                 }
1805                 sep->se_accept = 1;     /* force accept mode for built-ins */
1806                 sep->se_bi = bi;
1807         } else
1808                 sep->se_bi = NULL;
1809         if (sep->se_maxcpm < 0)
1810                 sep->se_maxcpm = maxcpm;
1811         if (sep->se_maxchild < 0) {     /* apply default max-children */
1812                 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1813                         sep->se_maxchild = sep->se_bi->bi_maxchild;
1814                 else if (sep->se_accept)
1815                         sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1816                 else
1817                         sep->se_maxchild = 1;
1818         }
1819         if (sep->se_maxchild > 0) {
1820                 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1821                 if (sep->se_pids == NULL) {
1822                         syslog(LOG_ERR, "malloc: %m");
1823                         exit(EX_OSERR);
1824                 }
1825         }
1826         argc = 0;
1827         for (arg = skip(&cp); cp; arg = skip(&cp))
1828                 if (argc < MAXARGV) {
1829                         sep->se_argv[argc++] = newstr(arg);
1830                 } else {
1831                         syslog(LOG_ERR,
1832                                 "%s: too many arguments for service %s",
1833                                 CONFIG, sep->se_service);
1834                         goto more;
1835                 }
1836         while (argc <= MAXARGV)
1837                 sep->se_argv[argc++] = NULL;
1838 #ifdef IPSEC
1839         sep->se_policy = policy ? newstr(policy) : NULL;
1840 #endif
1841         return (sep);
1842 }
1843
1844 void
1845 freeconfig(cp)
1846         struct servtab *cp;
1847 {
1848         int i;
1849
1850         if (cp->se_service)
1851                 free(cp->se_service);
1852         if (cp->se_proto)
1853                 free(cp->se_proto);
1854         if (cp->se_user)
1855                 free(cp->se_user);
1856         if (cp->se_group)
1857                 free(cp->se_group);
1858 #ifdef LOGIN_CAP
1859         if (cp->se_class)
1860                 free(cp->se_class);
1861 #endif
1862         if (cp->se_server)
1863                 free(cp->se_server);
1864         if (cp->se_pids)
1865                 free(cp->se_pids);
1866         for (i = 0; i < MAXARGV; i++)
1867                 if (cp->se_argv[i])
1868                         free(cp->se_argv[i]);
1869 #ifdef IPSEC
1870         if (cp->se_policy)
1871                 free(cp->se_policy);
1872 #endif
1873 }
1874
1875
1876 /*
1877  * Safe skip - if skip returns null, log a syntax error in the
1878  * configuration file and exit.
1879  */
1880 char *
1881 sskip(cpp)
1882         char **cpp;
1883 {
1884         char *cp;
1885
1886         cp = skip(cpp);
1887         if (cp == NULL) {
1888                 syslog(LOG_ERR, "%s: syntax error", CONFIG);
1889                 exit(EX_DATAERR);
1890         }
1891         return (cp);
1892 }
1893
1894 char *
1895 skip(cpp)
1896         char **cpp;
1897 {
1898         char *cp = *cpp;
1899         char *start;
1900         char quote = '\0';
1901
1902 again:
1903         while (*cp == ' ' || *cp == '\t')
1904                 cp++;
1905         if (*cp == '\0') {
1906                 int c;
1907
1908                 c = getc(fconfig);
1909                 (void) ungetc(c, fconfig);
1910                 if (c == ' ' || c == '\t')
1911                         if ((cp = nextline(fconfig)))
1912                                 goto again;
1913                 *cpp = (char *)0;
1914                 return ((char *)0);
1915         }
1916         if (*cp == '"' || *cp == '\'')
1917                 quote = *cp++;
1918         start = cp;
1919         if (quote)
1920                 while (*cp && *cp != quote)
1921                         cp++;
1922         else
1923                 while (*cp && *cp != ' ' && *cp != '\t')
1924                         cp++;
1925         if (*cp != '\0')
1926                 *cp++ = '\0';
1927         *cpp = cp;
1928         return (start);
1929 }
1930
1931 char *
1932 nextline(fd)
1933         FILE *fd;
1934 {
1935         char *cp;
1936
1937         if (fgets(line, sizeof (line), fd) == NULL)
1938                 return ((char *)0);
1939         cp = strchr(line, '\n');
1940         if (cp)
1941                 *cp = '\0';
1942         return (line);
1943 }
1944
1945 char *
1946 newstr(cp)
1947         const char *cp;
1948 {
1949         char *cr;
1950
1951         if ((cr = strdup(cp != NULL ? cp : "")))
1952                 return (cr);
1953         syslog(LOG_ERR, "strdup: %m");
1954         exit(EX_OSERR);
1955 }
1956
1957 void
1958 inetd_setproctitle(a, s)
1959         const char *a;
1960         int s;
1961 {
1962         socklen_t size;
1963         struct sockaddr_storage ss;
1964         char buf[80], pbuf[INET6_ADDRSTRLEN];
1965
1966         size = sizeof(ss);
1967         if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
1968                 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
1969                             NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID);
1970                 (void) sprintf(buf, "%s [%s]", a, pbuf);
1971         } else
1972                 (void) sprintf(buf, "%s", a);
1973         setproctitle("%s", buf);
1974 }
1975
1976 int
1977 check_loop(sa, sep)
1978         const struct sockaddr *sa;
1979         const struct servtab *sep;
1980 {
1981         struct servtab *se2;
1982         char pname[INET6_ADDRSTRLEN];
1983
1984         for (se2 = servtab; se2; se2 = se2->se_next) {
1985                 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
1986                         continue;
1987
1988                 switch (se2->se_family) {
1989                 case AF_INET:
1990                         if (((const struct sockaddr_in *)sa)->sin_port ==
1991                             se2->se_ctrladdr4.sin_port)
1992                                 goto isloop;
1993                         continue;
1994 #ifdef INET6
1995                 case AF_INET6:
1996                         if (((const struct sockaddr_in *)sa)->sin_port ==
1997                             se2->se_ctrladdr4.sin_port)
1998                                 goto isloop;
1999                         continue;
2000 #endif
2001                 default:
2002                         continue;
2003                 }
2004         isloop:
2005                 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2006                             NI_NUMERICHOST|NI_WITHSCOPEID);
2007                 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2008                        sep->se_service, sep->se_proto,
2009                        se2->se_service, se2->se_proto,
2010                        pname);
2011                 return 1;
2012         }
2013         return 0;
2014 }
2015
2016 /*
2017  * print_service:
2018  *      Dump relevant information to stderr
2019  */
2020 void
2021 print_service(action, sep)
2022         const char *action;
2023         const struct servtab *sep;
2024 {
2025         fprintf(stderr,
2026             "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2027 #ifdef LOGIN_CAP
2028             "class=%s"
2029 #endif
2030             " builtin=%p server=%s"
2031 #ifdef IPSEC
2032             " policy=\"%s\""
2033 #endif
2034             "\n",
2035             action, sep->se_service, sep->se_proto,
2036             sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2037 #ifdef LOGIN_CAP
2038             sep->se_class,
2039 #endif
2040             (void *) sep->se_bi, sep->se_server
2041 #ifdef IPSEC
2042             , (sep->se_policy ? sep->se_policy : "")
2043 #endif
2044             );
2045 }
2046
2047 #define CPMHSIZE        256
2048 #define CPMHMASK        (CPMHSIZE-1)
2049 #define CHTGRAN         10
2050 #define CHTSIZE         6
2051
2052 typedef struct CTime {
2053         unsigned long   ct_Ticks;
2054         int             ct_Count;
2055 } CTime;
2056
2057 typedef struct CHash {
2058         union {
2059                 struct in_addr  c4_Addr;
2060                 struct in6_addr c6_Addr;
2061         } cu_Addr;
2062 #define ch_Addr4        cu_Addr.c4_Addr
2063 #define ch_Addr6        cu_Addr.c6_Addr
2064         int             ch_Family;
2065         time_t          ch_LTime;
2066         char            *ch_Service;
2067         CTime           ch_Times[CHTSIZE];
2068 } CHash;
2069
2070 CHash   CHashAry[CPMHSIZE];
2071
2072 int
2073 cpmip(sep, ctrl)
2074         const struct servtab *sep;
2075         int ctrl;
2076 {
2077         struct sockaddr_storage rss;
2078         socklen_t rssLen = sizeof(rss);
2079         int r = 0;
2080
2081         /*
2082          * If getpeername() fails, just let it through (if logging is
2083          * enabled the condition is caught elsewhere)
2084          */
2085
2086         if (sep->se_maxcpm > 0 &&
2087             getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2088                 time_t t = time(NULL);
2089                 int hv = 0xABC3D20F;
2090                 int i;
2091                 int cnt = 0;
2092                 CHash *chBest = NULL;
2093                 unsigned int ticks = t / CHTGRAN;
2094                 struct sockaddr_in *sin4;
2095 #ifdef INET6
2096                 struct sockaddr_in6 *sin6;
2097 #endif
2098
2099                 sin4 = (struct sockaddr_in *)&rss;
2100 #ifdef INET6
2101                 sin6 = (struct sockaddr_in6 *)&rss;
2102 #endif
2103                 {
2104                         char *p;
2105                         int addrlen;
2106
2107                         switch (rss.ss_family) {
2108                         case AF_INET:
2109                                 p = (char *)&sin4->sin_addr;
2110                                 addrlen = sizeof(struct in_addr);
2111                                 break;
2112 #ifdef INET6
2113                         case AF_INET6:
2114                                 p = (char *)&sin6->sin6_addr;
2115                                 addrlen = sizeof(struct in6_addr);
2116                                 break;
2117 #endif
2118                         default:
2119                                 /* should not happen */
2120                                 return -1;
2121                         }
2122
2123                         for (i = 0; i < addrlen; ++i, ++p) {
2124                                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2125                         }
2126                         hv = (hv ^ (hv >> 16));
2127                 }
2128                 for (i = 0; i < 5; ++i) {
2129                         CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2130
2131                         if (rss.ss_family == AF_INET &&
2132                             ch->ch_Family == AF_INET &&
2133                             sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2134                             ch->ch_Service && strcmp(sep->se_service,
2135                             ch->ch_Service) == 0) {
2136                                 chBest = ch;
2137                                 break;
2138                         }
2139 #ifdef INET6
2140                         if (rss.ss_family == AF_INET6 &&
2141                             ch->ch_Family == AF_INET6 &&
2142                             IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2143                                                &ch->ch_Addr6) != 0 &&
2144                             ch->ch_Service && strcmp(sep->se_service,
2145                             ch->ch_Service) == 0) {
2146                                 chBest = ch;
2147                                 break;
2148                         }
2149 #endif
2150                         if (chBest == NULL || ch->ch_LTime == 0 ||
2151                             ch->ch_LTime < chBest->ch_LTime) {
2152                                 chBest = ch;
2153                         }
2154                 }
2155                 if ((rss.ss_family == AF_INET &&
2156                      (chBest->ch_Family != AF_INET ||
2157                       sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2158                     chBest->ch_Service == NULL ||
2159                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2160                         chBest->ch_Family = sin4->sin_family;
2161                         chBest->ch_Addr4 = sin4->sin_addr;
2162                         if (chBest->ch_Service)
2163                                 free(chBest->ch_Service);
2164                         chBest->ch_Service = strdup(sep->se_service);
2165                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2166                 }
2167 #ifdef INET6
2168                 if ((rss.ss_family == AF_INET6 &&
2169                      (chBest->ch_Family != AF_INET6 ||
2170                       IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2171                                          &chBest->ch_Addr6) == 0)) ||
2172                     chBest->ch_Service == NULL ||
2173                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2174                         chBest->ch_Family = sin6->sin6_family;
2175                         chBest->ch_Addr6 = sin6->sin6_addr;
2176                         if (chBest->ch_Service)
2177                                 free(chBest->ch_Service);
2178                         chBest->ch_Service = strdup(sep->se_service);
2179                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2180                 }
2181 #endif
2182                 chBest->ch_LTime = t;
2183                 {
2184                         CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2185                         if (ct->ct_Ticks != ticks) {
2186                                 ct->ct_Ticks = ticks;
2187                                 ct->ct_Count = 0;
2188                         }
2189                         ++ct->ct_Count;
2190                 }
2191                 for (i = 0; i < CHTSIZE; ++i) {
2192                         CTime *ct = &chBest->ch_Times[i];
2193                         if (ct->ct_Ticks <= ticks &&
2194                             ct->ct_Ticks >= ticks - CHTSIZE) {
2195                                 cnt += ct->ct_Count;
2196                         }
2197                 }
2198                 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) {
2199                         char pname[INET6_ADDRSTRLEN];
2200
2201                         getnameinfo((struct sockaddr *)&rss,
2202                                     ((struct sockaddr *)&rss)->sa_len,
2203                                     pname, sizeof(pname), NULL, 0,
2204                                     NI_NUMERICHOST|NI_WITHSCOPEID);
2205                         r = -1;
2206                         syslog(LOG_ERR,
2207                             "%s from %s exceeded counts/min (limit %d/min)",
2208                             sep->se_service, pname,
2209                             sep->se_maxcpm);
2210                 }
2211         }
2212         return(r);
2213 }