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  * @(#) Copyright (c) 1983, 1991, 1993, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)from: inetd.c    8.4 (Berkeley) 4/13/94
  35  * $FreeBSD: src/usr.sbin/inetd/inetd.c,v 1.80.2.11 2003/04/05 13:39:18 dwmalone Exp $
  36  */
  37
  38 /*
  39  * Inetd - Internet super-server
  40  *
  41  * This program invokes all internet services as needed.  Connection-oriented
  42  * services are invoked each time a connection is made, by creating a process.
  43  * This process is passed the connection as file descriptor 0 and is expected
  44  * to do a getpeername to find out the source host and port.
  45  *
  46  * Datagram oriented services are invoked when a datagram
  47  * arrives; a process is created and passed a pending message
  48  * on file descriptor 0.  Datagram servers may either connect
  49  * to their peer, freeing up the original socket for inetd
  50  * to receive further messages on, or ``take over the socket'',
  51  * processing all arriving datagrams and, eventually, timing
  52  * out.  The first type of server is said to be ``multi-threaded'';
  53  * the second type of server ``single-threaded''.
  54  *
  55  * Inetd uses a configuration file which is read at startup
  56  * and, possibly, at some later time in response to a hangup signal.
  57  * The configuration file is ``free format'' with fields given in the
  58  * order shown below.  Continuation lines for an entry must begin with
  59  * a space or tab.  All fields must be present in each entry.
  60  *
  61  *      service name                    must be in /etc/services
  62  *                                      or name a tcpmux service
  63  *                                      or specify a unix domain socket
  64  *      socket type                     stream/dgram/raw/rdm/seqpacket
  65  *      protocol                        tcp[4][6][/faith,ttcp], udp[4][6], unix
  66  *      wait/nowait                     single-threaded/multi-threaded
  67  *      user                            user to run daemon as
  68  *      server program                  full path name
  69  *      server program arguments        maximum of MAXARGS (20)
  70  *
  71  * TCP services without official port numbers are handled with the
  72  * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
  73  * requests. When a connection is made from a foreign host, the service
  74  * requested is passed to tcpmux, which looks it up in the servtab list
  75  * and returns the proper entry for the service. Tcpmux returns a
  76  * negative reply if the service doesn't exist, otherwise the invoked
  77  * server is expected to return the positive reply if the service type in
  78  * inetd.conf file has the prefix "tcpmux/". If the service type has the
  79  * prefix "tcpmux/+", tcpmux will return the positive reply for the
  80  * process; this is for compatibility with older server code, and also
  81  * allows you to invoke programs that use stdin/stdout without putting any
  82  * special server code in them. Services that use tcpmux are "nowait"
  83  * because they do not have a well-known port and hence cannot listen
  84  * for new requests.
  85  *
  86  * For RPC services
  87  *      service name/version            must be in /etc/rpc
  88  *      socket type                     stream/dgram/raw/rdm/seqpacket
  89  *      protocol                        rpc/tcp, rpc/udp
  90  *      wait/nowait                     single-threaded/multi-threaded
  91  *      user                            user to run daemon as
  92  *      server program                  full path name
  93  *      server program arguments        maximum of MAXARGS
  94  *
  95  * Comment lines are indicated by a `#' in column 1.
  96  *
  97  * #ifdef IPSEC
  98  * Comment lines that start with "#@" denote IPsec policy string, as described
  99  * in ipsec_set_policy(3).  This will affect all the following items in
 100  * inetd.conf(8).  To reset the policy, just use "#@" line.  By default,
 101  * there's no IPsec policy.
 102  * #endif
 103  */
 104 #include <sys/param.h>
 105 #include <sys/ioctl.h>
 106 #include <sys/wait.h>
 107 #include <sys/time.h>
 108 #include <sys/resource.h>
 109 #include <sys/stat.h>
 110 #include <sys/un.h>
 111
 112 #include <netinet/in.h>
 113 #include <netinet/tcp.h>
 114 #include <arpa/inet.h>
 115 #include <rpc/rpc.h>
 116 #include <rpc/pmap_clnt.h>
 117
 118 #include <errno.h>
 119 #include <err.h>
 120 #include <fcntl.h>
 121 #include <grp.h>
 122 #include <limits.h>
 123 #include <netdb.h>
 124 #include <pwd.h>
 125 #include <signal.h>
 126 #include <stdio.h>
 127 #include <stdlib.h>
 128 #include <string.h>
 129 #include <syslog.h>
 130 #include <tcpd.h>
 131 #include <unistd.h>
 132 #include <libutil.h>
 133 #include <sysexits.h>
 134 #include <ctype.h>
 135
 136 #include "inetd.h"
 137 #include "pathnames.h"
 138
 139 #ifdef IPSEC
 140 #include <netinet6/ipsec.h>
 141 #ifndef IPSEC_POLICY_IPSEC      /* no ipsec support on old ipsec */
 142 #undef IPSEC
 143 #endif
 144 #endif
 145
 146 /* wrapper for KAME-special getnameinfo() */
 147 #ifndef NI_WITHSCOPEID
 148 #define NI_WITHSCOPEID  0
 149 #endif
 150
 151 #ifndef LIBWRAP_ALLOW_FACILITY
 152 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
 153 #endif
 154 #ifndef LIBWRAP_ALLOW_SEVERITY
 155 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
 156 #endif
 157 #ifndef LIBWRAP_DENY_FACILITY
 158 # define LIBWRAP_DENY_FACILITY LOG_AUTH
 159 #endif
 160 #ifndef LIBWRAP_DENY_SEVERITY
 161 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
 162 #endif
 163
 164 #define ISWRAP(sep)     \
 165            ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
 166         && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
 167         && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
 168             || (sep)->se_socktype == SOCK_DGRAM))
 169
 170 #ifdef LOGIN_CAP
 171 #include <login_cap.h>
 172
 173 /* see init.c */
 174 #define RESOURCE_RC "daemon"
 175
 176 #endif
 177
 178 #ifndef MAXCHILD
 179 #define MAXCHILD        -1              /* maximum number of this service
 180                                            < 0 = no limit */
 181 #endif
 182
 183 #ifndef MAXCPM
 184 #define MAXCPM          -1              /* rate limit invocations from a
 185                                            single remote address,
 186                                            < 0 = no limit */
 187 #endif
 188
 189 #ifndef MAXPERIP
 190 #define MAXPERIP        -1              /* maximum number of this service
 191                                            from a single remote address,
 192                                            < 0 = no limit */
 193 #endif
 194
 195 #ifndef TOOMANY
 196 #define TOOMANY         256             /* don't start more than TOOMANY */
 197 #endif
 198 #define CNT_INTVL       60              /* servers in CNT_INTVL sec. */
 199 #define RETRYTIME       (60*10)         /* retry after bind or server fail */
 200 #define MAX_MAXCHLD     32767           /* max allowable max children */
 201
 202 #define SIGBLOCK        (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
 203
 204 void            close_sep(struct servtab *);
 205 void            flag_signal(int);
 206 void            flag_config(int);
 207 void            config(void);
 208 int             cpmip(const struct servtab *, int);
 209 void            endconfig(void);
 210 struct servtab *enter(struct servtab *);
 211 void            freeconfig(struct servtab *);
 212 struct servtab *getconfigent(void);
 213 int             matchservent(const char *, const char *, const char *);
 214 char           *nextline(FILE *);
 215 void            addchild(struct servtab *, int);
 216 void            flag_reapchild(int);
 217 void            reapchild(void);
 218 void            enable(struct servtab *);
 219 void            disable(struct servtab *);
 220 void            flag_retry(int);
 221 void            retry(void);
 222 int             setconfig(void);
 223 void            setup(struct servtab *);
 224 #ifdef IPSEC
 225 void            ipsecsetup(struct servtab *);
 226 #endif
 227 void            unregisterrpc(struct servtab *sep);
 228 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
 229 static int      room_conn(struct servtab *sep, struct conninfo *conn);
 230 static void     addchild_conn(struct conninfo *conn, pid_t pid);
 231 static void     reapchild_conn(pid_t pid);
 232 static void     free_conn(struct conninfo *conn);
 233 static void     resize_conn(struct servtab *sep, int maxperip);
 234 static void     free_connlist(struct servtab *sep);
 235 static void     free_proc(struct procinfo *);
 236 static struct procinfo *search_proc(pid_t pid, int add);
 237 static int      hashval(char *p, int len);
 238
 239 int     allow_severity;
 240 int     deny_severity;
 241 int     wrap_ex = 0;
 242 int     wrap_bi = 0;
 243 int     debug = 0;
 244 int     dolog = 0;
 245 int     maxsock;                        /* highest-numbered descriptor */
 246 fd_set  allsock;
 247 int     options;
 248 int     timingout;
 249 int     toomany = TOOMANY;
 250 int     maxchild = MAXCHILD;
 251 int     maxcpm = MAXCPM;
 252 int     maxperip = MAXPERIP;
 253 struct  servent *sp;
 254 struct  rpcent *rpc;
 255 char    *hostname = NULL;
 256 struct  sockaddr_in *bind_sa4;
 257 int     no_v4bind = 1;
 258 #ifdef INET6
 259 struct  sockaddr_in6 *bind_sa6;
 260 int     no_v6bind = 1;
 261 #endif
 262 int     signalpipe[2];
 263 #ifdef SANITY_CHECK
 264 int     nsock;
 265 #endif
 266 uid_t   euid;
 267 gid_t   egid;
 268 mode_t  mask;
 269
 270 struct  servtab *servtab;
 271
 272 extern struct biltin biltins[];
 273
 274 #define NUMINT  (sizeof(intab) / sizeof(struct inent))
 275 const char      *CONFIG = _PATH_INETDCONF;
 276 const char      *pid_file = _PATH_INETDPID;
 277
 278 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
 279
 280 int
 281 getvalue(const char *arg, int *value, const char *whine)
 282 {
 283         int  tmp;
 284         char *p;
 285
 286         tmp = strtol(arg, &p, 0);
 287         if (tmp < 0 || *p) {
 288                 syslog(LOG_ERR, whine, arg);
 289                 return 1;                       /* failure */
 290         }
 291         *value = tmp;
 292         return 0;                               /* success */
 293 }
 294
 295 static sa_family_t
 296 whichaf(struct request_info *req)
 297 {
 298         struct sockaddr *sa;
 299
 300         sa = (struct sockaddr *)req->client->sin;
 301         if (sa == NULL)
 302                 return AF_UNSPEC;
 303         if (sa->sa_family == AF_INET6 &&
 304             IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr))
 305                 return AF_INET;
 306         return sa->sa_family;
 307 }
 308
 309 int
 310 main(int argc, char **argv)
 311 {
 312         struct servtab *sep;
 313         struct passwd *pwd;
 314         struct group *grp;
 315         struct sigaction sa, saalrm, sachld, sahup, sapipe;
 316         int ch, dofork;
 317         pid_t pid;
 318         char buf[50];
 319 #ifdef LOGIN_CAP
 320         login_cap_t *lc = NULL;
 321 #endif
 322         struct request_info req;
 323         int denied;
 324         char *service = NULL;
 325         union {
 326                 struct sockaddr peer_un;
 327                 struct sockaddr_in peer_un4;
 328                 struct sockaddr_in6 peer_un6;
 329                 struct sockaddr_storage peer_max;
 330         } p_un;
 331 #define peer    p_un.peer_un
 332 #define peer4   p_un.peer_un4
 333 #define peer6   p_un.peer_un6
 334 #define peermax p_un.peer_max
 335         int i;
 336         struct addrinfo hints, *res;
 337         const char *servname;
 338         int error;
 339         struct conninfo *conn;
 340
 341         openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
 342
 343         while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
 344                 switch(ch) {
 345                 case 'd':
 346                         debug = 1;
 347                         options |= SO_DEBUG;
 348                         break;
 349                 case 'l':
 350                         dolog = 1;
 351                         break;
 352                 case 'R':
 353                         getvalue(optarg, &toomany,
 354                                 "-R %s: bad value for service invocation rate");
 355                         break;
 356                 case 'c':
 357                         getvalue(optarg, &maxchild,
 358                                 "-c %s: bad value for maximum children");
 359                         break;
 360                 case 'C':
 361                         getvalue(optarg, &maxcpm,
 362                                 "-C %s: bad value for maximum children/minute");
 363                         break;
 364                 case 'a':
 365                         hostname = optarg;
 366                         break;
 367                 case 'p':
 368                         pid_file = optarg;
 369                         break;
 370                 case 's':
 371                         getvalue(optarg, &maxperip,
 372                                 "-s %s: bad value for maximum children per source address");
 373                         break;
 374                 case 'w':
 375                         wrap_ex++;
 376                         break;
 377                 case 'W':
 378                         wrap_bi++;
 379                         break;
 380                 case '?':
 381                 default:
 382                         syslog(LOG_ERR,
 383                                 "usage: inetd [-dlwW] [-a address] [-R rate]"
 384                                 " [-c maximum] [-C rate]"
 385                                 " [-p pidfile] [conf-file]");
 386                         exit(EX_USAGE);
 387                 }
 388         /*
 389          * Initialize Bind Addrs.
 390          *   When hostname is NULL, wild card bind addrs are obtained from
 391          *   getaddrinfo(). But getaddrinfo() requires at least one of
 392          *   hostname or servname is non NULL.
 393          *   So when hostname is NULL, set dummy value to servname.
 394          */
 395         servname = (hostname == NULL) ? "discard" /* dummy */ : NULL;
 396
 397         bzero(&hints, sizeof(struct addrinfo));
 398         hints.ai_flags = AI_PASSIVE;
 399         hints.ai_family = AF_UNSPEC;
 400         error = getaddrinfo(hostname, servname, &hints, &res);
 401         if (error != 0) {
 402                 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
 403                 if (error == EAI_SYSTEM)
 404                         syslog(LOG_ERR, "%s", strerror(errno));
 405                 exit(EX_USAGE);
 406         }
 407         do {
 408                 if (res->ai_addr == NULL) {
 409                         syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
 410                         exit(EX_USAGE);
 411                 }
 412                 switch (res->ai_addr->sa_family) {
 413                 case AF_INET:
 414                         if (no_v4bind == 0)
 415                                 continue;
 416                         bind_sa4 = (struct sockaddr_in *)res->ai_addr;
 417                         /* init port num in case servname is dummy */
 418                         bind_sa4->sin_port = 0;
 419                         no_v4bind = 0;
 420                         continue;
 421 #ifdef INET6
 422                 case AF_INET6:
 423                         if (no_v6bind == 0)
 424                                 continue;
 425                         bind_sa6 = (struct sockaddr_in6 *)res->ai_addr;
 426                         /* init port num in case servname is dummy */
 427                         bind_sa6->sin6_port = 0;
 428                         no_v6bind = 0;
 429                         continue;
 430 #endif
 431                 }
 432                 if (no_v4bind == 0
 433 #ifdef INET6
 434                     && no_v6bind == 0
 435 #endif
 436                     )
 437                         break;
 438         } while ((res = res->ai_next) != NULL);
 439         if (no_v4bind != 0
 440 #ifdef INET6
 441             && no_v6bind != 0
 442 #endif
 443             ) {
 444                 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
 445                 exit(EX_USAGE);
 446         }
 447
 448         euid = geteuid();
 449         egid = getegid();
 450         umask(mask = umask(0777));
 451
 452         argc -= optind;
 453         argv += optind;
 454
 455         if (argc > 0)
 456                 CONFIG = argv[0];
 457         if (debug == 0) {
 458                 FILE *fp;
 459                 if (daemon(0, 0) < 0) {
 460                         syslog(LOG_WARNING, "daemon(0,0) failed: %m");
 461                 }
 462                 /* From now on we don't want syslog messages going to stderr. */
 463                 closelog();
 464                 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
 465                 /*
 466                  * In case somebody has started inetd manually, we need to
 467                  * clear the logname, so that old servers run as root do not
 468                  * get the user's logname..
 469                  */
 470                 if (setlogin("") < 0) {
 471                         syslog(LOG_WARNING, "cannot clear logname: %m");
 472                         /* no big deal if it fails.. */
 473                 }
 474                 pid = getpid();
 475                 fp = fopen(pid_file, "w");
 476                 if (fp) {
 477                         fprintf(fp, "%ld\n", (long)pid);
 478                         fclose(fp);
 479                 } else {
 480                         syslog(LOG_WARNING, "%s: %m", pid_file);
 481                 }
 482         }
 483         for (i = 0; i < PERIPSIZE; ++i)
 484                 LIST_INIT(&proctable[i]);
 485         sa.sa_flags = 0;
 486         sigemptyset(&sa.sa_mask);
 487         sigaddset(&sa.sa_mask, SIGALRM);
 488         sigaddset(&sa.sa_mask, SIGCHLD);
 489         sigaddset(&sa.sa_mask, SIGHUP);
 490         sa.sa_handler = flag_retry;
 491         sigaction(SIGALRM, &sa, &saalrm);
 492         config();
 493         sa.sa_handler = flag_config;
 494         sigaction(SIGHUP, &sa, &sahup);
 495         sa.sa_handler = flag_reapchild;
 496         sigaction(SIGCHLD, &sa, &sachld);
 497         sa.sa_handler = SIG_IGN;
 498         sigaction(SIGPIPE, &sa, &sapipe);
 499
 500         {
 501                 /* space for daemons to overwrite environment for ps */
 502 #define DUMMYSIZE       100
 503                 char dummy[DUMMYSIZE];
 504
 505                 memset(dummy, 'x', DUMMYSIZE - 1);
 506                 dummy[DUMMYSIZE - 1] = '\0';
 507                 if (setenv("inetd_dummy", dummy, 1) == -1)
 508                         syslog(LOG_WARNING, "setenv: cannot set inetd_dummy=%s: %m", dummy);
 509
 510         }
 511
 512         if (pipe(signalpipe) != 0) {
 513                 syslog(LOG_ERR, "pipe: %m");
 514                 exit(EX_OSERR);
 515         }
 516         if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 ||
 517             fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) {
 518                 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m");
 519                 exit(EX_OSERR);
 520         }
 521         FD_SET(signalpipe[0], &allsock);
 522 #ifdef SANITY_CHECK
 523         nsock++;
 524 #endif
 525         if (signalpipe[0] > maxsock)
 526             maxsock = signalpipe[0];
 527         if (signalpipe[1] > maxsock)
 528             maxsock = signalpipe[1];
 529
 530         for (;;) {
 531             int n, ctrl;
 532             fd_set readable;
 533
 534 #ifdef SANITY_CHECK
 535             if (nsock == 0) {
 536                 syslog(LOG_ERR, "%s: nsock=0", __func__);
 537                 exit(EX_SOFTWARE);
 538             }
 539 #endif
 540             readable = allsock;
 541             if ((n = select(maxsock + 1, &readable, NULL, NULL, NULL)) <= 0) {
 542                     if (n < 0 && errno != EINTR) {
 543                         syslog(LOG_WARNING, "select: %m");
 544                         sleep(1);
 545                     }
 546                     continue;
 547             }
 548             /* handle any queued signal flags */
 549             if (FD_ISSET(signalpipe[0], &readable)) {
 550                 int nsig;
 551                 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
 552                     syslog(LOG_ERR, "ioctl: %m");
 553                     exit(EX_OSERR);
 554                 }
 555                 while (--nsig >= 0) {
 556                     char c;
 557                     if (read(signalpipe[0], &c, 1) != 1) {
 558                         syslog(LOG_ERR, "read: %m");
 559                         exit(EX_OSERR);
 560                     }
 561                     if (debug)
 562                         warnx("handling signal flag %c", c);
 563                     switch(c) {
 564                     case 'A': /* sigalrm */
 565                         retry();
 566                         break;
 567                     case 'C': /* sigchld */
 568                         reapchild();
 569                         break;
 570                     case 'H': /* sighup */
 571                         config();
 572                         break;
 573                     }
 574                 }
 575             }
 576             for (sep = servtab; n && sep; sep = sep->se_next)
 577                 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
 578                     n--;
 579                     if (debug)
 580                             warnx("someone wants %s", sep->se_service);
 581                     dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
 582                     conn = NULL;
 583                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
 584                             i = 1;
 585                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 586                                     syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
 587                             ctrl = accept(sep->se_fd, NULL, NULL);
 588                             if (debug)
 589                                     warnx("accept, ctrl %d", ctrl);
 590                             if (ctrl < 0) {
 591                                     if (errno != EINTR)
 592                                             syslog(LOG_WARNING,
 593                                                 "accept (for %s): %m",
 594                                                 sep->se_service);
 595                                       if (sep->se_accept &&
 596                                           sep->se_socktype == SOCK_STREAM)
 597                                               close(ctrl);
 598                                     continue;
 599                             }
 600                             i = 0;
 601                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 602                                     syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
 603                             if (ioctl(ctrl, FIONBIO, &i) < 0)
 604                                     syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
 605                             if (cpmip(sep, ctrl) < 0) {
 606                                 close(ctrl);
 607                                 continue;
 608                             }
 609                             if (dofork &&
 610                                 (conn = search_conn(sep, ctrl)) != NULL &&
 611                                 !room_conn(sep, conn)) {
 612                                 close(ctrl);
 613                                 continue;
 614                             }
 615                     } else
 616                             ctrl = sep->se_fd;
 617                     if (dolog && !ISWRAP(sep)) {
 618                             char pname[INET6_ADDRSTRLEN] = "unknown";
 619                             socklen_t sl;
 620                             sl = sizeof peermax;
 621                             if (getpeername(ctrl, (struct sockaddr *)
 622                                             &peermax, &sl)) {
 623                                     sl = sizeof peermax;
 624                                     if (recvfrom(ctrl, buf, sizeof(buf),
 625                                         MSG_PEEK,
 626                                         (struct sockaddr *)&peermax,
 627                                         &sl) >= 0) {
 628                                       getnameinfo((struct sockaddr *)&peermax,
 629                                                   peer.sa_len,
 630                                                   pname, sizeof(pname),
 631                                                   NULL, 0,
 632                                                   NI_NUMERICHOST|
 633                                                   NI_WITHSCOPEID);
 634                                     }
 635                             } else {
 636                                     getnameinfo((struct sockaddr *)&peermax,
 637                                                 peer.sa_len,
 638                                                 pname, sizeof(pname),
 639                                                 NULL, 0,
 640                                                 NI_NUMERICHOST|
 641                                                 NI_WITHSCOPEID);
 642                             }
 643                             syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
 644                     }
 645                     sigblock(SIGBLOCK);
 646                     pid = 0;
 647                     /*
 648                      * Fork for all external services, builtins which need to
 649                      * fork and anything we're wrapping (as wrapping might
 650                      * block or use hosts_options(5) twist).
 651                      */
 652                     if (dofork) {
 653                             if (sep->se_count++ == 0)
 654                                 gettimeofday(&sep->se_time, NULL);
 655                             else if (toomany > 0 && sep->se_count >= toomany) {
 656                                 struct timeval now;
 657
 658                                 gettimeofday(&now, NULL);
 659                                 if (now.tv_sec - sep->se_time.tv_sec >
 660                                     CNT_INTVL) {
 661                                         sep->se_time = now;
 662                                         sep->se_count = 1;
 663                                 } else {
 664                                         syslog(LOG_ERR,
 665                         "%s/%s server failing (looping), service terminated",
 666                                             sep->se_service, sep->se_proto);
 667                                         if (sep->se_accept &&
 668                                             sep->se_socktype == SOCK_STREAM)
 669                                                 close(ctrl);
 670                                         close_sep(sep);
 671                                         free_conn(conn);
 672                                         sigsetmask(0L);
 673                                         if (!timingout) {
 674                                                 timingout = 1;
 675                                                 alarm(RETRYTIME);
 676                                         }
 677                                         continue;
 678                                 }
 679                             }
 680                             pid = fork();
 681                     }
 682                     if (pid < 0) {
 683                             syslog(LOG_ERR, "fork: %m");
 684                             if (sep->se_accept &&
 685                                 sep->se_socktype == SOCK_STREAM)
 686                                     close(ctrl);
 687                             free_conn(conn);
 688                             sigsetmask(0L);
 689                             sleep(1);
 690                             continue;
 691                     }
 692                     if (pid) {
 693                         addchild_conn(conn, pid);
 694                         addchild(sep, pid);
 695                     }
 696                     sigsetmask(0L);
 697                     if (pid == 0) {
 698                             if (dofork) {
 699                                 sigaction(SIGALRM, &saalrm, NULL);
 700                                 sigaction(SIGCHLD, &sachld, NULL);
 701                                 sigaction(SIGHUP, &sahup, NULL);
 702                                 /* SIGPIPE reset before exec */
 703                             }
 704                             /*
 705                              * Call tcpmux to find the real service to exec.
 706                              */
 707                             if (sep->se_bi &&
 708                                 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
 709                                     sep = tcpmux(ctrl);
 710                                     if (sep == NULL) {
 711                                             close(ctrl);
 712                                             _exit(0);
 713                                     }
 714                             }
 715                             if (ISWRAP(sep)) {
 716                                 inetd_setproctitle("wrapping", ctrl);
 717                                 service = sep->se_server_name ?
 718                                     sep->se_server_name : sep->se_service;
 719                                 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL);
 720                                 fromhost(&req);
 721                                 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
 722                                 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
 723                                 denied = !hosts_access(&req);
 724                                 if (denied) {
 725                                     syslog(deny_severity,
 726                                         "refused connection from %.500s, service %s (%s%s)",
 727                                         eval_client(&req), service, sep->se_proto,
 728                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 729                                     if (sep->se_socktype != SOCK_STREAM)
 730                                         recv(ctrl, buf, sizeof (buf), 0);
 731                                     if (dofork) {
 732                                         sleep(1);
 733                                         _exit(0);
 734                                     }
 735                                 }
 736                                 if (dolog) {
 737                                     syslog(allow_severity,
 738                                         "connection from %.500s, service %s (%s%s)",
 739                                         eval_client(&req), service, sep->se_proto,
 740                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 741                                 }
 742                             }
 743                             if (sep->se_bi) {
 744                                 (*sep->se_bi->bi_fn)(ctrl, sep);
 745                             } else {
 746                                 if (debug)
 747                                         warnx("%d execl %s",
 748                                                 getpid(), sep->se_server);
 749                                 /* Clear close-on-exec. */
 750                                 if (fcntl(ctrl, F_SETFD, 0) < 0) {
 751                                         syslog(LOG_ERR,
 752                                             "%s/%s: fcntl (F_SETFD, 0): %m",
 753                                                 sep->se_service, sep->se_proto);
 754                                         _exit(EX_OSERR);
 755                                 }
 756                                 if (ctrl != 0) {
 757                                         dup2(ctrl, 0);
 758                                         close(ctrl);
 759                                 }
 760                                 dup2(0, 1);
 761                                 dup2(0, 2);
 762                                 if ((pwd = getpwnam(sep->se_user)) == NULL) {
 763                                         syslog(LOG_ERR,
 764                                             "%s/%s: %s: no such user",
 765                                                 sep->se_service, sep->se_proto,
 766                                                 sep->se_user);
 767                                         if (sep->se_socktype != SOCK_STREAM)
 768                                                 recv(0, buf, sizeof (buf), 0);
 769                                         _exit(EX_NOUSER);
 770                                 }
 771                                 grp = NULL;
 772                                 if (   sep->se_group != NULL
 773                                     && (grp = getgrnam(sep->se_group)) == NULL
 774                                    ) {
 775                                         syslog(LOG_ERR,
 776                                             "%s/%s: %s: no such group",
 777                                                 sep->se_service, sep->se_proto,
 778                                                 sep->se_group);
 779                                         if (sep->se_socktype != SOCK_STREAM)
 780                                                 recv(0, buf, sizeof (buf), 0);
 781                                         _exit(EX_NOUSER);
 782                                 }
 783                                 if (grp != NULL)
 784                                         pwd->pw_gid = grp->gr_gid;
 785 #ifdef LOGIN_CAP
 786                                 if ((lc = login_getclass(sep->se_class)) == NULL) {
 787                                         /* error syslogged by getclass */
 788                                         syslog(LOG_ERR,
 789                                             "%s/%s: %s: login class error",
 790                                                 sep->se_service, sep->se_proto,
 791                                                 sep->se_class);
 792                                         if (sep->se_socktype != SOCK_STREAM)
 793                                                 recv(0, buf, sizeof (buf), 0);
 794                                         _exit(EX_NOUSER);
 795                                 }
 796 #endif
 797                                 if (setsid() < 0) {
 798                                         syslog(LOG_ERR,
 799                                                 "%s: can't setsid(): %m",
 800                                                  sep->se_service);
 801                                         /* _exit(EX_OSERR); not fatal yet */
 802                                 }
 803 #ifdef LOGIN_CAP
 804                                 if (setusercontext(lc, pwd, pwd->pw_uid,
 805                                     LOGIN_SETALL) != 0) {
 806                                         syslog(LOG_ERR,
 807                                          "%s: can't setusercontext(..%s..): %m",
 808                                          sep->se_service, sep->se_user);
 809                                         _exit(EX_OSERR);
 810                                 }
 811                                 login_close(lc);
 812 #else
 813                                 if (pwd->pw_uid) {
 814                                         if (setlogin(sep->se_user) < 0) {
 815                                                 syslog(LOG_ERR,
 816                                                  "%s: can't setlogin(%s): %m",
 817                                                  sep->se_service, sep->se_user);
 818                                                 /* _exit(EX_OSERR); not yet */
 819                                         }
 820                                         if (setgid(pwd->pw_gid) < 0) {
 821                                                 syslog(LOG_ERR,
 822                                                   "%s: can't set gid %d: %m",
 823                                                   sep->se_service, pwd->pw_gid);
 824                                                 _exit(EX_OSERR);
 825                                         }
 826                                         initgroups(pwd->pw_name,
 827                                                         pwd->pw_gid);
 828                                         if (setuid(pwd->pw_uid) < 0) {
 829                                                 syslog(LOG_ERR,
 830                                                   "%s: can't set uid %d: %m",
 831                                                   sep->se_service, pwd->pw_uid);
 832                                                 _exit(EX_OSERR);
 833                                         }
 834                                 }
 835 #endif
 836                                 sigaction(SIGPIPE, &sapipe, NULL);
 837                                 execv(sep->se_server, sep->se_argv);
 838                                 syslog(LOG_ERR,
 839                                     "cannot execute %s: %m", sep->se_server);
 840                                 if (sep->se_socktype != SOCK_STREAM)
 841                                         recv(0, buf, sizeof (buf), 0);
 842                             }
 843                             if (dofork)
 844                                 _exit(0);
 845                     }
 846                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
 847                             close(ctrl);
 848                 }
 849         }
 850 }
 851
 852 /*
 853  * Add a signal flag to the signal flag queue for later handling
 854  */
 855
 856 void
 857 flag_signal(int c)
 858 {
 859         char ch = c;
 860
 861         if (write(signalpipe[1], &ch, 1) != 1) {
 862                 syslog(LOG_ERR, "write: %m");
 863                 _exit(EX_OSERR);
 864         }
 865 }
 866
 867 /*
 868  * Record a new child pid for this service. If we've reached the
 869  * limit on children, then stop accepting incoming requests.
 870  */
 871
 872 void
 873 addchild(struct servtab *sep, pid_t pid)
 874 {
 875         if (sep->se_maxchild <= 0)
 876                 return;
 877 #ifdef SANITY_CHECK
 878         if (sep->se_numchild >= sep->se_maxchild) {
 879                 syslog(LOG_ERR, "%s: %d >= %d",
 880                     __func__, sep->se_numchild, sep->se_maxchild);
 881                 exit(EX_SOFTWARE);
 882         }
 883 #endif
 884         sep->se_pids[sep->se_numchild++] = pid;
 885         if (sep->se_numchild == sep->se_maxchild)
 886                 disable(sep);
 887 }
 888
 889 /*
 890  * Some child process has exited. See if it's on somebody's list.
 891  */
 892
 893 void
 894 flag_reapchild(int signo __unused)
 895 {
 896         flag_signal('C');
 897 }
 898
 899 void
 900 reapchild(void)
 901 {
 902         int k, status;
 903         pid_t pid;
 904         struct servtab *sep;
 905
 906         for (;;) {
 907                 pid = wait3(&status, WNOHANG, NULL);
 908                 if (pid <= 0)
 909                         break;
 910                 if (debug)
 911                         warnx("%d reaped, %s %u", pid,
 912                             WIFEXITED(status) ? "status" : "signal",
 913                             WIFEXITED(status) ? WEXITSTATUS(status)
 914                                 : WTERMSIG(status));
 915                 for (sep = servtab; sep; sep = sep->se_next) {
 916                         for (k = 0; k < sep->se_numchild; k++)
 917                                 if (sep->se_pids[k] == pid)
 918                                         break;
 919                         if (k == sep->se_numchild)
 920                                 continue;
 921                         if (sep->se_numchild == sep->se_maxchild)
 922                                 enable(sep);
 923                         sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
 924                         if (WIFSIGNALED(status) || WEXITSTATUS(status))
 925                                 syslog(LOG_WARNING,
 926                                     "%s[%d]: exited, %s %u",
 927                                     sep->se_server, pid,
 928                                     WIFEXITED(status) ? "status" : "signal",
 929                                     WIFEXITED(status) ? WEXITSTATUS(status)
 930                                         : WTERMSIG(status));
 931                         break;
 932                 }
 933                 reapchild_conn(pid);
 934         }
 935 }
 936
 937 void
 938 flag_config(int signo __unused)
 939 {
 940         flag_signal('H');
 941 }
 942
 943 void
 944 config(void)
 945 {
 946         struct servtab *sep, *new, **sepp;
 947         long omask;
 948 #ifdef LOGIN_CAP
 949         login_cap_t *lc = NULL;
 950 #endif
 951
 952
 953         if (!setconfig()) {
 954                 syslog(LOG_ERR, "%s: %m", CONFIG);
 955                 return;
 956         }
 957         for (sep = servtab; sep; sep = sep->se_next)
 958                 sep->se_checked = 0;
 959         while ((new = getconfigent())) {
 960                 if (getpwnam(new->se_user) == NULL) {
 961                         syslog(LOG_ERR,
 962                                 "%s/%s: no such user '%s', service ignored",
 963                                 new->se_service, new->se_proto, new->se_user);
 964                         continue;
 965                 }
 966                 if (new->se_group && getgrnam(new->se_group) == NULL) {
 967                         syslog(LOG_ERR,
 968                                 "%s/%s: no such group '%s', service ignored",
 969                                 new->se_service, new->se_proto, new->se_group);
 970                         continue;
 971                 }
 972 #ifdef LOGIN_CAP
 973                 if ((lc = login_getclass(new->se_class)) == NULL) {
 974                         /* error syslogged by getclass */
 975                         syslog(LOG_ERR,
 976                                 "%s/%s: %s: login class error, service ignored",
 977                                 new->se_service, new->se_proto, new->se_class);
 978                         continue;
 979                 }
 980                 login_close(lc);
 981 #endif
 982                 for (sep = servtab; sep; sep = sep->se_next)
 983                         if (strcmp(sep->se_service, new->se_service) == 0 &&
 984                             strcmp(sep->se_proto, new->se_proto) == 0 &&
 985                             sep->se_socktype == new->se_socktype &&
 986                             sep->se_family == new->se_family)
 987                                 break;
 988                 if (sep != NULL) {
 989                         int i;
 990
 991 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; }
 992                         omask = sigblock(SIGBLOCK);
 993                         if (sep->se_nomapped != new->se_nomapped) {
 994                                 sep->se_nomapped = new->se_nomapped;
 995                                 sep->se_reset = 1;
 996                         }
 997                         /* copy over outstanding child pids */
 998                         if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
 999                                 new->se_numchild = sep->se_numchild;
1000                                 if (new->se_numchild > new->se_maxchild)
1001                                         new->se_numchild = new->se_maxchild;
1002                                 memcpy(new->se_pids, sep->se_pids,
1003                                     new->se_numchild * sizeof(*new->se_pids));
1004                         }
1005                         SWAP(sep->se_pids, new->se_pids);
1006                         sep->se_maxchild = new->se_maxchild;
1007                         sep->se_numchild = new->se_numchild;
1008                         sep->se_maxcpm = new->se_maxcpm;
1009                         resize_conn(sep, new->se_maxperip);
1010                         sep->se_maxperip = new->se_maxperip;
1011                         sep->se_bi = new->se_bi;
1012                         /* might need to turn on or off service now */
1013                         if (sep->se_fd >= 0) {
1014                               if (sep->se_maxchild > 0
1015                                   && sep->se_numchild == sep->se_maxchild) {
1016                                       if (FD_ISSET(sep->se_fd, &allsock))
1017                                           disable(sep);
1018                               } else {
1019                                       if (!FD_ISSET(sep->se_fd, &allsock))
1020                                           enable(sep);
1021                               }
1022                         }
1023                         sep->se_accept = new->se_accept;
1024                         SWAP(sep->se_user, new->se_user);
1025                         SWAP(sep->se_group, new->se_group);
1026 #ifdef LOGIN_CAP
1027                         SWAP(sep->se_class, new->se_class);
1028 #endif
1029                         SWAP(sep->se_server, new->se_server);
1030                         SWAP(sep->se_server_name, new->se_server_name);
1031                         for (i = 0; i < MAXARGV; i++)
1032                                 SWAP(sep->se_argv[i], new->se_argv[i]);
1033 #ifdef IPSEC
1034                         SWAP(sep->se_policy, new->se_policy);
1035                         ipsecsetup(sep);
1036 #endif
1037                         sigsetmask(omask);
1038                         freeconfig(new);
1039                         if (debug)
1040                                 print_service("REDO", sep);
1041                 } else {
1042                         sep = enter(new);
1043                         if (debug)
1044                                 print_service("ADD ", sep);
1045                 }
1046                 sep->se_checked = 1;
1047                 if (ISMUX(sep)) {
1048                         sep->se_fd = -1;
1049                         continue;
1050                 }
1051                 switch (sep->se_family) {
1052                 case AF_INET:
1053                         if (no_v4bind != 0) {
1054                                 sep->se_fd = -1;
1055                                 continue;
1056                         }
1057                         break;
1058 #ifdef INET6
1059                 case AF_INET6:
1060                         if (no_v6bind != 0) {
1061                                 sep->se_fd = -1;
1062                                 continue;
1063                         }
1064                         break;
1065 #endif
1066                 }
1067                 if (!sep->se_rpc) {
1068                         if (sep->se_family != AF_UNIX) {
1069                                 sp = getservbyname(sep->se_service, sep->se_proto);
1070                                 if (sp == NULL) {
1071                                         syslog(LOG_ERR, "%s/%s: unknown service",
1072                                         sep->se_service, sep->se_proto);
1073                                         sep->se_checked = 0;
1074                                         continue;
1075                                 }
1076                         }
1077                         switch (sep->se_family) {
1078                         case AF_INET:
1079                                 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1080                                         sep->se_ctrladdr4.sin_port =
1081                                                 sp->s_port;
1082                                         sep->se_reset = 1;
1083                                 }
1084                                 break;
1085 #ifdef INET6
1086                         case AF_INET6:
1087                                 if (sp->s_port !=
1088                                     sep->se_ctrladdr6.sin6_port) {
1089                                         sep->se_ctrladdr6.sin6_port =
1090                                                 sp->s_port;
1091                                         sep->se_reset = 1;
1092                                 }
1093                                 break;
1094 #endif
1095                         }
1096                         if (sep->se_reset != 0 && sep->se_fd >= 0)
1097                                 close_sep(sep);
1098                 } else {
1099                         rpc = getrpcbyname(sep->se_service);
1100                         if (rpc == NULL) {
1101                                 syslog(LOG_ERR, "%s/%s unknown RPC service",
1102                                         sep->se_service, sep->se_proto);
1103                                 if (sep->se_fd != -1)
1104                                         close(sep->se_fd);
1105                                 sep->se_fd = -1;
1106                                         continue;
1107                         }
1108                         if (rpc->r_number != sep->se_rpc_prog) {
1109                                 if (sep->se_rpc_prog)
1110                                         unregisterrpc(sep);
1111                                 sep->se_rpc_prog = rpc->r_number;
1112                                 if (sep->se_fd != -1)
1113                                         close(sep->se_fd);
1114                                 sep->se_fd = -1;
1115                         }
1116                 }
1117                 if (sep->se_fd == -1)
1118                         setup(sep);
1119         }
1120         endconfig();
1121         /*
1122          * Purge anything not looked at above.
1123          */
1124         omask = sigblock(SIGBLOCK);
1125         sepp = &servtab;
1126         while ((sep = *sepp)) {
1127                 if (sep->se_checked) {
1128                         sepp = &sep->se_next;
1129                         continue;
1130                 }
1131                 *sepp = sep->se_next;
1132                 if (sep->se_fd >= 0)
1133                         close_sep(sep);
1134                 if (debug)
1135                         print_service("FREE", sep);
1136                 if (sep->se_rpc && sep->se_rpc_prog > 0)
1137                         unregisterrpc(sep);
1138                 freeconfig(sep);
1139                 free(sep);
1140         }
1141         sigsetmask(omask);
1142 }
1143
1144 void
1145 unregisterrpc(struct servtab *sep)
1146 {
1147         u_int i;
1148         struct servtab *sepp;
1149         long omask;
1150
1151         omask = sigblock(SIGBLOCK);
1152         for (sepp = servtab; sepp; sepp = sepp->se_next) {
1153                 if (sepp == sep)
1154                         continue;
1155                 if (sep->se_checked == 0 ||
1156                     !sepp->se_rpc ||
1157                     sep->se_rpc_prog != sepp->se_rpc_prog)
1158                         continue;
1159                 return;
1160         }
1161         if (debug)
1162                 print_service("UNREG", sep);
1163         for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++)
1164                 pmap_unset(sep->se_rpc_prog, i);
1165         if (sep->se_fd != -1)
1166                 close(sep->se_fd);
1167         sep->se_fd = -1;
1168         sigsetmask(omask);
1169 }
1170
1171 void
1172 flag_retry(int signo __unused)
1173 {
1174         flag_signal('A');
1175 }
1176
1177 void
1178 retry(void)
1179 {
1180         struct servtab *sep;
1181
1182         timingout = 0;
1183         for (sep = servtab; sep; sep = sep->se_next)
1184                 if (sep->se_fd == -1 && !ISMUX(sep))
1185                         setup(sep);
1186 }
1187
1188 void
1189 setup(struct servtab *sep)
1190 {
1191         int on = 1;
1192
1193         if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1194                 if (debug)
1195                         warn("socket failed on %s/%s",
1196                                 sep->se_service, sep->se_proto);
1197                 syslog(LOG_ERR, "%s/%s: socket: %m",
1198                     sep->se_service, sep->se_proto);
1199                 return;
1200         }
1201         /* Set all listening sockets to close-on-exec. */
1202         if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) {
1203                 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m",
1204                     sep->se_service, sep->se_proto);
1205                 close(sep->se_fd);
1206                 return;
1207         }
1208 #define turnon(fd, opt) \
1209 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1210         if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1211             turnon(sep->se_fd, SO_DEBUG) < 0)
1212                 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1213         if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1214                 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1215 #ifdef SO_PRIVSTATE
1216         if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1217                 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1218 #endif
1219         /* tftpd opens a new connection then needs more infos */
1220         if ((sep->se_family == AF_INET6) &&
1221             (strcmp(sep->se_proto, "udp") == 0) &&
1222             (sep->se_accept == 0) &&
1223             (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO,
1224                         (char *)&on, sizeof (on)) < 0))
1225                 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1226         if (sep->se_family == AF_INET6) {
1227                 int flag = sep->se_nomapped ? 1 : 0;
1228                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1229                                (char *)&flag, sizeof (flag)) < 0)
1230                         syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1231         }
1232 #undef turnon
1233         if (sep->se_type == TTCP_TYPE)
1234                 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH,
1235                     (char *)&on, sizeof (on)) < 0)
1236                         syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m");
1237 #ifdef IPV6_FAITH
1238         if (sep->se_type == FAITH_TYPE) {
1239                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on,
1240                                 sizeof(on)) < 0) {
1241                         syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m");
1242                 }
1243         }
1244 #endif
1245 #ifdef IPSEC
1246         ipsecsetup(sep);
1247 #endif
1248         if (sep->se_family == AF_UNIX) {
1249                 unlink(sep->se_ctrladdr_un.sun_path);
1250                 umask(0777); /* Make socket with conservative permissions */
1251         }
1252         if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1253             sep->se_ctrladdr_size) < 0) {
1254                 if (debug)
1255                         warn("bind failed on %s/%s",
1256                                 sep->se_service, sep->se_proto);
1257                 syslog(LOG_ERR, "%s/%s: bind: %m",
1258                     sep->se_service, sep->se_proto);
1259                 close(sep->se_fd);
1260                 sep->se_fd = -1;
1261                 if (!timingout) {
1262                         timingout = 1;
1263                         alarm(RETRYTIME);
1264                 }
1265                 if (sep->se_family == AF_UNIX)
1266                         umask(mask);
1267                 return;
1268         }
1269         if (sep->se_family == AF_UNIX) {
1270                 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1271                 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1272                         syslog(LOG_ERR, "chown socket: %m");
1273                 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1274                         syslog(LOG_ERR, "chmod socket: %m");
1275                 umask(mask);
1276         }
1277         if (sep->se_rpc) {
1278                 u_int i;
1279                 socklen_t len = sep->se_ctrladdr_size;
1280
1281                 if (sep->se_family != AF_INET) {
1282                         syslog(LOG_ERR,
1283                                "%s/%s: unsupported address family for rpc",
1284                                sep->se_service, sep->se_proto);
1285                         close(sep->se_fd);
1286                         sep->se_fd = -1;
1287                         return;
1288                 }
1289                 if (getsockname(sep->se_fd,
1290                                 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1291                         syslog(LOG_ERR, "%s/%s: getsockname: %m",
1292                                sep->se_service, sep->se_proto);
1293                         close(sep->se_fd);
1294                         sep->se_fd = -1;
1295                         return;
1296                 }
1297                 if (debug)
1298                         print_service("REG ", sep);
1299                 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1300                         pmap_unset(sep->se_rpc_prog, i);
1301                         pmap_set(sep->se_rpc_prog, i,
1302                                  (sep->se_socktype == SOCK_DGRAM)
1303                                  ? IPPROTO_UDP : IPPROTO_TCP,
1304                                  ntohs(sep->se_ctrladdr4.sin_port));
1305                 }
1306         }
1307         if (sep->se_socktype == SOCK_STREAM)
1308                 listen(sep->se_fd, 64);
1309         enable(sep);
1310         if (debug) {
1311                 warnx("registered %s on %d",
1312                         sep->se_server, sep->se_fd);
1313         }
1314 }
1315
1316 #ifdef IPSEC
1317 void
1318 ipsecsetup(struct servtab *sep)
1319 {
1320         char *buf;
1321         char *policy_in = NULL;
1322         char *policy_out = NULL;
1323         int level;
1324         int opt;
1325
1326         switch (sep->se_family) {
1327         case AF_INET:
1328                 level = IPPROTO_IP;
1329                 opt = IP_IPSEC_POLICY;
1330                 break;
1331 #ifdef INET6
1332         case AF_INET6:
1333                 level = IPPROTO_IPV6;
1334                 opt = IPV6_IPSEC_POLICY;
1335                 break;
1336 #endif
1337         default:
1338                 return;
1339         }
1340
1341         if (!sep->se_policy || sep->se_policy[0] == '\0') {
1342                 static char def_in[] = "in entrust", def_out[] = "out entrust";
1343                 policy_in = def_in;
1344                 policy_out = def_out;
1345         } else {
1346                 if (!strncmp("in", sep->se_policy, 2))
1347                         policy_in = sep->se_policy;
1348                 else if (!strncmp("out", sep->se_policy, 3))
1349                         policy_out = sep->se_policy;
1350                 else {
1351                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1352                                 sep->se_policy);
1353                         return;
1354                 }
1355         }
1356
1357         if (policy_in != NULL) {
1358                 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1359                 if (buf != NULL) {
1360                         if (setsockopt(sep->se_fd, level, opt,
1361                                         buf, ipsec_get_policylen(buf)) < 0 &&
1362                             debug != 0)
1363                                 warnx("%s/%s: ipsec initialization failed; %s",
1364                                       sep->se_service, sep->se_proto,
1365                                       policy_in);
1366                         free(buf);
1367                 } else
1368                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1369                                 policy_in);
1370         }
1371         if (policy_out != NULL) {
1372                 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1373                 if (buf != NULL) {
1374                         if (setsockopt(sep->se_fd, level, opt,
1375                                         buf, ipsec_get_policylen(buf)) < 0 &&
1376                             debug != 0)
1377                                 warnx("%s/%s: ipsec initialization failed; %s",
1378                                       sep->se_service, sep->se_proto,
1379                                       policy_out);
1380                         free(buf);
1381                 } else
1382                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1383                                 policy_out);
1384         }
1385 }
1386 #endif
1387
1388 /*
1389  * Finish with a service and its socket.
1390  */
1391 void
1392 close_sep(struct servtab *sep)
1393 {
1394         if (sep->se_fd >= 0) {
1395                 if (FD_ISSET(sep->se_fd, &allsock))
1396                         disable(sep);
1397                 close(sep->se_fd);
1398                 sep->se_fd = -1;
1399         }
1400         sep->se_count = 0;
1401         sep->se_numchild = 0;   /* forget about any existing children */
1402 }
1403
1404 int
1405 matchservent(const char *name1, const char *name2, const char *proto)
1406 {
1407         char **alias, *p;
1408         struct servent *se;
1409
1410         if (strcmp(proto, "unix") == 0) {
1411                 if ((p = strrchr(name1, '/')) != NULL)
1412                         name1 = p + 1;
1413                 if ((p = strrchr(name2, '/')) != NULL)
1414                         name2 = p + 1;
1415         }
1416         if (strcmp(name1, name2) == 0)
1417                 return(1);
1418         if ((se = getservbyname(name1, proto)) != NULL) {
1419                 if (strcmp(name2, se->s_name) == 0)
1420                         return(1);
1421                 for (alias = se->s_aliases; *alias; alias++)
1422                         if (strcmp(name2, *alias) == 0)
1423                                 return(1);
1424         }
1425         return(0);
1426 }
1427
1428 struct servtab *
1429 enter(struct servtab *cp)
1430 {
1431         struct servtab *sep;
1432         long omask;
1433
1434         sep = (struct servtab *)malloc(sizeof (*sep));
1435         if (sep == NULL) {
1436                 syslog(LOG_ERR, "malloc: %m");
1437                 exit(EX_OSERR);
1438         }
1439         *sep = *cp;
1440         sep->se_fd = -1;
1441         omask = sigblock(SIGBLOCK);
1442         sep->se_next = servtab;
1443         servtab = sep;
1444         sigsetmask(omask);
1445         return (sep);
1446 }
1447
1448 void
1449 enable(struct servtab *sep)
1450 {
1451         if (debug)
1452                 warnx(
1453                     "enabling %s, fd %d", sep->se_service, sep->se_fd);
1454 #ifdef SANITY_CHECK
1455         if (sep->se_fd < 0) {
1456                 syslog(LOG_ERR,
1457                     "%s: %s: bad fd", __func__, sep->se_service);
1458                 exit(EX_SOFTWARE);
1459         }
1460         if (ISMUX(sep)) {
1461                 syslog(LOG_ERR,
1462                     "%s: %s: is mux", __func__, sep->se_service);
1463                 exit(EX_SOFTWARE);
1464         }
1465         if (FD_ISSET(sep->se_fd, &allsock)) {
1466                 syslog(LOG_ERR,
1467                     "%s: %s: not off", __func__, sep->se_service);
1468                 exit(EX_SOFTWARE);
1469         }
1470         nsock++;
1471 #endif
1472         FD_SET(sep->se_fd, &allsock);
1473         if (sep->se_fd > maxsock)
1474                 maxsock = sep->se_fd;
1475 }
1476
1477 void
1478 disable(struct servtab *sep)
1479 {
1480         if (debug)
1481                 warnx(
1482                     "disabling %s, fd %d", sep->se_service, sep->se_fd);
1483 #ifdef SANITY_CHECK
1484         if (sep->se_fd < 0) {
1485                 syslog(LOG_ERR,
1486                     "%s: %s: bad fd", __func__, sep->se_service);
1487                 exit(EX_SOFTWARE);
1488         }
1489         if (ISMUX(sep)) {
1490                 syslog(LOG_ERR,
1491                     "%s: %s: is mux", __func__, sep->se_service);
1492                 exit(EX_SOFTWARE);
1493         }
1494         if (!FD_ISSET(sep->se_fd, &allsock)) {
1495                 syslog(LOG_ERR,
1496                     "%s: %s: not on", __func__, sep->se_service);
1497                 exit(EX_SOFTWARE);
1498         }
1499         if (nsock == 0) {
1500                 syslog(LOG_ERR, "%s: nsock=0", __func__);
1501                 exit(EX_SOFTWARE);
1502         }
1503         nsock--;
1504 #endif
1505         FD_CLR(sep->se_fd, &allsock);
1506         if (sep->se_fd == maxsock)
1507                 maxsock--;
1508 }
1509
1510 FILE    *fconfig = NULL;
1511 struct  servtab serv;
1512 char    line[LINE_MAX];
1513
1514 int
1515 setconfig(void)
1516 {
1517
1518         if (fconfig != NULL) {
1519                 fseek(fconfig, 0L, SEEK_SET);
1520                 return (1);
1521         }
1522         fconfig = fopen(CONFIG, "r");
1523         return (fconfig != NULL);
1524 }
1525
1526 void
1527 endconfig(void)
1528 {
1529         if (fconfig) {
1530                 fclose(fconfig);
1531                 fconfig = NULL;
1532         }
1533 }
1534
1535 struct servtab *
1536 getconfigent(void)
1537 {
1538         struct servtab *sep = &serv;
1539         int argc;
1540         char *cp, *arg, *s;
1541         char *versp;
1542         static char TCPMUX_TOKEN[] = "tcpmux/";
1543 #define MUX_LEN         (sizeof(TCPMUX_TOKEN)-1)
1544 #ifdef IPSEC
1545         char *policy = NULL;
1546 #endif
1547         int v4bind = 0;
1548 #ifdef INET6
1549         int v6bind = 0;
1550 #endif
1551         int i;
1552
1553 more:
1554         while ((cp = nextline(fconfig)) != NULL) {
1555 #ifdef IPSEC
1556                 /* lines starting with #@ is not a comment, but the policy */
1557                 if (cp[0] == '#' && cp[1] == '@') {
1558                         char *p;
1559                         for (p = cp + 2; p && *p && isspace(*p); p++)
1560                                 ;
1561                         if (*p == '\0') {
1562                                 if (policy)
1563                                         free(policy);
1564                                 policy = NULL;
1565                         } else if (ipsec_get_policylen(p) >= 0) {
1566                                 if (policy)
1567                                         free(policy);
1568                                 policy = newstr(p);
1569                         } else {
1570                                 syslog(LOG_ERR,
1571                                         "%s: invalid ipsec policy \"%s\"",
1572                                         CONFIG, p);
1573                                 exit(EX_CONFIG);
1574                         }
1575                 }
1576 #endif
1577                 if (*cp == '#' || *cp == '\0')
1578                         continue;
1579                 break;
1580         }
1581         if (cp == NULL)
1582                 return (NULL);
1583         /*
1584          * clear the static buffer, since some fields (se_ctrladdr,
1585          * for example) don't get initialized here.
1586          */
1587         memset(sep, 0, sizeof *sep);
1588         arg = skip(&cp);
1589         if (cp == NULL) {
1590                 /* got an empty line containing just blanks/tabs. */
1591                 goto more;
1592         }
1593         if (arg[0] == ':') { /* :user:group:perm: */
1594                 char *user, *group, *perm;
1595                 struct passwd *pw;
1596                 struct group *gr;
1597                 user = arg+1;
1598                 if ((group = strchr(user, ':')) == NULL) {
1599                         syslog(LOG_ERR, "no group after user '%s'", user);
1600                         goto more;
1601                 }
1602                 *group++ = '\0';
1603                 if ((perm = strchr(group, ':')) == NULL) {
1604                         syslog(LOG_ERR, "no mode after group '%s'", group);
1605                         goto more;
1606                 }
1607                 *perm++ = '\0';
1608                 if ((pw = getpwnam(user)) == NULL) {
1609                         syslog(LOG_ERR, "no such user '%s'", user);
1610                         goto more;
1611                 }
1612                 sep->se_sockuid = pw->pw_uid;
1613                 if ((gr = getgrnam(group)) == NULL) {
1614                         syslog(LOG_ERR, "no such user '%s'", group);
1615                         goto more;
1616                 }
1617                 sep->se_sockgid = gr->gr_gid;
1618                 sep->se_sockmode = strtol(perm, &arg, 8);
1619                 if (*arg != ':') {
1620                         syslog(LOG_ERR, "bad mode '%s'", perm);
1621                         goto more;
1622                 }
1623                 *arg++ = '\0';
1624         } else {
1625                 sep->se_sockuid = euid;
1626                 sep->se_sockgid = egid;
1627                 sep->se_sockmode = 0200;
1628         }
1629         if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1630                 char *c = arg + MUX_LEN;
1631                 if (*c == '+') {
1632                         sep->se_type = MUXPLUS_TYPE;
1633                         c++;
1634                 } else
1635                         sep->se_type = MUX_TYPE;
1636                 sep->se_service = newstr(c);
1637         } else {
1638                 sep->se_service = newstr(arg);
1639                 sep->se_type = NORM_TYPE;
1640         }
1641         arg = sskip(&cp);
1642         if (strcmp(arg, "stream") == 0)
1643                 sep->se_socktype = SOCK_STREAM;
1644         else if (strcmp(arg, "dgram") == 0)
1645                 sep->se_socktype = SOCK_DGRAM;
1646         else if (strcmp(arg, "rdm") == 0)
1647                 sep->se_socktype = SOCK_RDM;
1648         else if (strcmp(arg, "seqpacket") == 0)
1649                 sep->se_socktype = SOCK_SEQPACKET;
1650         else if (strcmp(arg, "raw") == 0)
1651                 sep->se_socktype = SOCK_RAW;
1652         else
1653                 sep->se_socktype = -1;
1654
1655         arg = sskip(&cp);
1656         if (strncmp(arg, "tcp", 3) == 0) {
1657                 sep->se_proto = newstr(strsep(&arg, "/"));
1658                 if (arg != NULL) {
1659                         if (strcmp(arg, "ttcp") == 0)
1660                                 sep->se_type = TTCP_TYPE;
1661                         else if (strcmp(arg, "faith") == 0)
1662                                 sep->se_type = FAITH_TYPE;
1663                 }
1664         } else {
1665                 if (sep->se_type == NORM_TYPE &&
1666                     strncmp(arg, "faith/", 6) == 0) {
1667                         arg += 6;
1668                         sep->se_type = FAITH_TYPE;
1669                 }
1670                 sep->se_proto = newstr(arg);
1671         }
1672         if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1673                 if (no_v4bind != 0) {
1674                         syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1675                                sep->se_service);
1676                         freeconfig(sep);
1677                         goto more;
1678                 }
1679                 memmove(sep->se_proto, sep->se_proto + 4,
1680                     strlen(sep->se_proto) + 1 - 4);
1681                 sep->se_rpc = 1;
1682                 sep->se_rpc_prog = sep->se_rpc_lowvers =
1683                         sep->se_rpc_highvers = 0;
1684                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1685                        sizeof(sep->se_ctrladdr4));
1686                 if ((versp = strrchr(sep->se_service, '/'))) {
1687                         *versp++ = '\0';
1688                         switch (sscanf(versp, "%u-%u",
1689                                        &sep->se_rpc_lowvers,
1690                                        &sep->se_rpc_highvers)) {
1691                         case 2:
1692                                 break;
1693                         case 1:
1694                                 sep->se_rpc_highvers =
1695                                         sep->se_rpc_lowvers;
1696                                 break;
1697                         default:
1698                                 syslog(LOG_ERR,
1699                                         "bad RPC version specifier; %s",
1700                                         sep->se_service);
1701                                 freeconfig(sep);
1702                                 goto more;
1703                         }
1704                 }
1705                 else {
1706                         sep->se_rpc_lowvers =
1707                                 sep->se_rpc_highvers = 1;
1708                 }
1709         }
1710         sep->se_nomapped = 0;
1711         while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1712 #ifdef INET6
1713                 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1714                         if (no_v6bind != 0) {
1715                                 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s",
1716                                        sep->se_service);
1717                                 freeconfig(sep);
1718                                 goto more;
1719                         }
1720                         sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1721                         v6bind = 1;
1722                         continue;
1723                 }
1724 #endif
1725                 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1726                         sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1727                         v4bind = 1;
1728                         continue;
1729                 }
1730                 /* illegal version num */
1731                 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1732                 freeconfig(sep);
1733                 goto more;
1734         }
1735         if (strcmp(sep->se_proto, "unix") == 0) {
1736                 sep->se_family = AF_UNIX;
1737         } else
1738 #ifdef INET6
1739         if (v6bind != 0) {
1740                 sep->se_family = AF_INET6;
1741                 if (v4bind == 0 || no_v4bind != 0)
1742                         sep->se_nomapped = 1;
1743         } else
1744 #endif
1745         { /* default to v4 bind if not v6 bind */
1746                 if (no_v4bind != 0) {
1747                         syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1748                                sep->se_service);
1749                         freeconfig(sep);
1750                         goto more;
1751                 }
1752                 sep->se_family = AF_INET;
1753         }
1754         /* init ctladdr */
1755         switch(sep->se_family) {
1756         case AF_INET:
1757                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1758                        sizeof(sep->se_ctrladdr4));
1759                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1760                 break;
1761 #ifdef INET6
1762         case AF_INET6:
1763                 memcpy(&sep->se_ctrladdr6, bind_sa6,
1764                        sizeof(sep->se_ctrladdr6));
1765                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1766                 break;
1767 #endif
1768         case AF_UNIX:
1769                 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1770                         syslog(LOG_ERR,
1771                             "domain socket pathname too long for service %s",
1772                             sep->se_service);
1773                         goto more;
1774                 }
1775                 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1776                 sep->se_ctrladdr_un.sun_family = sep->se_family;
1777                 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1778                 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1779                 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1780         }
1781         arg = sskip(&cp);
1782         if (!strncmp(arg, "wait", 4))
1783                 sep->se_accept = 0;
1784         else if (!strncmp(arg, "nowait", 6))
1785                 sep->se_accept = 1;
1786         else {
1787                 syslog(LOG_ERR,
1788                         "%s: bad wait/nowait for service %s",
1789                         CONFIG, sep->se_service);
1790                 goto more;
1791         }
1792         sep->se_maxchild = -1;
1793         sep->se_maxcpm = -1;
1794         sep->se_maxperip = -1;
1795         if ((s = strchr(arg, '/')) != NULL) {
1796                 char *eptr;
1797                 u_long val;
1798
1799                 val = strtoul(s + 1, &eptr, 10);
1800                 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1801                         syslog(LOG_ERR,
1802                                 "%s: bad max-child for service %s",
1803                                 CONFIG, sep->se_service);
1804                         goto more;
1805                 }
1806                 if (debug)
1807                         if (!sep->se_accept && val != 1)
1808                                 warnx("maxchild=%lu for wait service %s"
1809                                     " not recommended", val, sep->se_service);
1810                 sep->se_maxchild = val;
1811                 if (*eptr == '/')
1812                         sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1813                 if (*eptr == '/')
1814                         sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1815                 /*
1816                  * explicitly do not check for \0 for future expansion /
1817                  * backwards compatibility
1818                  */
1819         }
1820         if (ISMUX(sep)) {
1821                 /*
1822                  * Silently enforce "nowait" mode for TCPMUX services
1823                  * since they don't have an assigned port to listen on.
1824                  */
1825                 sep->se_accept = 1;
1826                 if (strcmp(sep->se_proto, "tcp")) {
1827                         syslog(LOG_ERR,
1828                                 "%s: bad protocol for tcpmux service %s",
1829                                 CONFIG, sep->se_service);
1830                         goto more;
1831                 }
1832                 if (sep->se_socktype != SOCK_STREAM) {
1833                         syslog(LOG_ERR,
1834                                 "%s: bad socket type for tcpmux service %s",
1835                                 CONFIG, sep->se_service);
1836                         goto more;
1837                 }
1838         }
1839         sep->se_user = newstr(sskip(&cp));
1840 #ifdef LOGIN_CAP
1841         if ((s = strrchr(sep->se_user, '/')) != NULL) {
1842                 *s = '\0';
1843                 sep->se_class = newstr(s + 1);
1844         } else
1845                 sep->se_class = newstr(RESOURCE_RC);
1846 #endif
1847         if ((s = strrchr(sep->se_user, ':')) != NULL) {
1848                 *s = '\0';
1849                 sep->se_group = newstr(s + 1);
1850         } else
1851                 sep->se_group = NULL;
1852         sep->se_server = newstr(sskip(&cp));
1853         if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1854                 sep->se_server_name++;
1855         if (strcmp(sep->se_server, "internal") == 0) {
1856                 struct biltin *bi;
1857
1858                 for (bi = biltins; bi->bi_service; bi++)
1859                         if (bi->bi_socktype == sep->se_socktype &&
1860                             matchservent(bi->bi_service, sep->se_service,
1861                             sep->se_proto))
1862                                 break;
1863                 if (bi->bi_service == 0) {
1864                         syslog(LOG_ERR, "internal service %s unknown",
1865                                 sep->se_service);
1866                         goto more;
1867                 }
1868                 sep->se_accept = 1;     /* force accept mode for built-ins */
1869                 sep->se_bi = bi;
1870         } else
1871                 sep->se_bi = NULL;
1872         if (sep->se_maxperip < 0)
1873                 sep->se_maxperip = maxperip;
1874         if (sep->se_maxcpm < 0)
1875                 sep->se_maxcpm = maxcpm;
1876         if (sep->se_maxchild < 0) {     /* apply default max-children */
1877                 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1878                         sep->se_maxchild = sep->se_bi->bi_maxchild;
1879                 else if (sep->se_accept)
1880                         sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1881                 else
1882                         sep->se_maxchild = 1;
1883         }
1884         if (sep->se_maxchild > 0) {
1885                 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1886                 if (sep->se_pids == NULL) {
1887                         syslog(LOG_ERR, "malloc: %m");
1888                         exit(EX_OSERR);
1889                 }
1890         }
1891         argc = 0;
1892         for (arg = skip(&cp); cp; arg = skip(&cp))
1893                 if (argc < MAXARGV) {
1894                         sep->se_argv[argc++] = newstr(arg);
1895                 } else {
1896                         syslog(LOG_ERR,
1897                                 "%s: too many arguments for service %s",
1898                                 CONFIG, sep->se_service);
1899                         goto more;
1900                 }
1901         while (argc <= MAXARGV)
1902                 sep->se_argv[argc++] = NULL;
1903         for (i = 0; i < PERIPSIZE; ++i)
1904                 LIST_INIT(&sep->se_conn[i]);
1905 #ifdef IPSEC
1906         sep->se_policy = policy ? newstr(policy) : NULL;
1907 #endif
1908         return (sep);
1909 }
1910
1911 void
1912 freeconfig(struct servtab *cp)
1913 {
1914         int i;
1915
1916         if (cp->se_service)
1917                 free(cp->se_service);
1918         if (cp->se_proto)
1919                 free(cp->se_proto);
1920         if (cp->se_user)
1921                 free(cp->se_user);
1922         if (cp->se_group)
1923                 free(cp->se_group);
1924 #ifdef LOGIN_CAP
1925         if (cp->se_class)
1926                 free(cp->se_class);
1927 #endif
1928         if (cp->se_server)
1929                 free(cp->se_server);
1930         if (cp->se_pids)
1931                 free(cp->se_pids);
1932         for (i = 0; i < MAXARGV; i++)
1933                 if (cp->se_argv[i])
1934                         free(cp->se_argv[i]);
1935         free_connlist(cp);
1936 #ifdef IPSEC
1937         if (cp->se_policy)
1938                 free(cp->se_policy);
1939 #endif
1940 }
1941
1942
1943 /*
1944  * Safe skip - if skip returns null, log a syntax error in the
1945  * configuration file and exit.
1946  */
1947 char *
1948 sskip(char **cpp)
1949 {
1950         char *cp;
1951
1952         cp = skip(cpp);
1953         if (cp == NULL) {
1954                 syslog(LOG_ERR, "%s: syntax error", CONFIG);
1955                 exit(EX_DATAERR);
1956         }
1957         return (cp);
1958 }
1959
1960 char *
1961 skip(char **cpp)
1962 {
1963         char *cp = *cpp;
1964         char *start;
1965         char quote = '\0';
1966
1967 again:
1968         while (*cp == ' ' || *cp == '\t')
1969                 cp++;
1970         if (*cp == '\0') {
1971                 int c;
1972
1973                 c = getc(fconfig);
1974                 ungetc(c, fconfig);
1975                 if (c == ' ' || c == '\t')
1976                         if ((cp = nextline(fconfig)))
1977                                 goto again;
1978                 *cpp = NULL;
1979                 return (NULL);
1980         }
1981         if (*cp == '"' || *cp == '\'')
1982                 quote = *cp++;
1983         start = cp;
1984         if (quote)
1985                 while (*cp && *cp != quote)
1986                         cp++;
1987         else
1988                 while (*cp && *cp != ' ' && *cp != '\t')
1989                         cp++;
1990         if (*cp != '\0')
1991                 *cp++ = '\0';
1992         *cpp = cp;
1993         return (start);
1994 }
1995
1996 char *
1997 nextline(FILE *fd)
1998 {
1999         char *cp;
2000
2001         if (fgets(line, sizeof (line), fd) == NULL)
2002                 return (NULL);
2003         cp = strchr(line, '\n');
2004         if (cp)
2005                 *cp = '\0';
2006         return (line);
2007 }
2008
2009 char *
2010 newstr(const char *cp)
2011 {
2012         char *cr;
2013
2014         if ((cr = strdup(cp != NULL ? cp : "")))
2015                 return (cr);
2016         syslog(LOG_ERR, "strdup: %m");
2017         exit(EX_OSERR);
2018 }
2019
2020 void
2021 inetd_setproctitle(const char *a, int s)
2022 {
2023         socklen_t size;
2024         struct sockaddr_storage ss;
2025         char buf[80], pbuf[INET6_ADDRSTRLEN];
2026
2027         size = sizeof(ss);
2028         if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2029                 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2030                             NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID);
2031                 sprintf(buf, "%s [%s]", a, pbuf);
2032         } else
2033                 sprintf(buf, "%s", a);
2034         setproctitle("%s", buf);
2035 }
2036
2037 int
2038 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2039 {
2040         struct servtab *se2;
2041         char pname[INET6_ADDRSTRLEN];
2042
2043         for (se2 = servtab; se2; se2 = se2->se_next) {
2044                 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2045                         continue;
2046
2047                 switch (se2->se_family) {
2048                 case AF_INET:
2049                         if (((const struct sockaddr_in *)sa)->sin_port ==
2050                             se2->se_ctrladdr4.sin_port)
2051                                 goto isloop;
2052                         continue;
2053 #ifdef INET6
2054                 case AF_INET6:
2055                         if (((const struct sockaddr_in *)sa)->sin_port ==
2056                             se2->se_ctrladdr4.sin_port)
2057                                 goto isloop;
2058                         continue;
2059 #endif
2060                 default:
2061                         continue;
2062                 }
2063         isloop:
2064                 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2065                             NI_NUMERICHOST|NI_WITHSCOPEID);
2066                 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2067                        sep->se_service, sep->se_proto,
2068                        se2->se_service, se2->se_proto,
2069                        pname);
2070                 return 1;
2071         }
2072         return 0;
2073 }
2074
2075 /*
2076  * print_service:
2077  *      Dump relevant information to stderr
2078  */
2079 void
2080 print_service(const char *action, const struct servtab *sep)
2081 {
2082         fprintf(stderr,
2083             "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2084 #ifdef LOGIN_CAP
2085             "class=%s"
2086 #endif
2087             " builtin=%p server=%s"
2088 #ifdef IPSEC
2089             " policy=\"%s\""
2090 #endif
2091             "\n",
2092             action, sep->se_service, sep->se_proto,
2093             sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2094 #ifdef LOGIN_CAP
2095             sep->se_class,
2096 #endif
2097             (void *) sep->se_bi, sep->se_server
2098 #ifdef IPSEC
2099             , (sep->se_policy ? sep->se_policy : "")
2100 #endif
2101             );
2102 }
2103
2104 #define CPMHSIZE        256
2105 #define CPMHMASK        (CPMHSIZE-1)
2106 #define CHTGRAN         10
2107 #define CHTSIZE         6
2108
2109 typedef struct CTime {
2110         unsigned long   ct_Ticks;
2111         int             ct_Count;
2112 } CTime;
2113
2114 typedef struct CHash {
2115         union {
2116                 struct in_addr  c4_Addr;
2117                 struct in6_addr c6_Addr;
2118         } cu_Addr;
2119 #define ch_Addr4        cu_Addr.c4_Addr
2120 #define ch_Addr6        cu_Addr.c6_Addr
2121         int             ch_Family;
2122         time_t          ch_LTime;
2123         char            *ch_Service;
2124         CTime           ch_Times[CHTSIZE];
2125 } CHash;
2126
2127 CHash   CHashAry[CPMHSIZE];
2128
2129 int
2130 cpmip(const struct servtab *sep, int ctrl)
2131 {
2132         struct sockaddr_storage rss;
2133         socklen_t rssLen = sizeof(rss);
2134         int r = 0;
2135
2136         /*
2137          * If getpeername() fails, just let it through (if logging is
2138          * enabled the condition is caught elsewhere)
2139          */
2140
2141         if (sep->se_maxcpm > 0 &&
2142             getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2143                 time_t t = time(NULL);
2144                 int hv = 0xABC3D20F;
2145                 int i;
2146                 int cnt = 0;
2147                 CHash *chBest = NULL;
2148                 unsigned int ticks = t / CHTGRAN;
2149                 struct sockaddr_in *sin4;
2150 #ifdef INET6
2151                 struct sockaddr_in6 *sin6;
2152 #endif
2153
2154                 sin4 = (struct sockaddr_in *)&rss;
2155 #ifdef INET6
2156                 sin6 = (struct sockaddr_in6 *)&rss;
2157 #endif
2158                 {
2159                         char *p;
2160                         int addrlen;
2161
2162                         switch (rss.ss_family) {
2163                         case AF_INET:
2164                                 p = (char *)&sin4->sin_addr;
2165                                 addrlen = sizeof(struct in_addr);
2166                                 break;
2167 #ifdef INET6
2168                         case AF_INET6:
2169                                 p = (char *)&sin6->sin6_addr;
2170                                 addrlen = sizeof(struct in6_addr);
2171                                 break;
2172 #endif
2173                         default:
2174                                 /* should not happen */
2175                                 return -1;
2176                         }
2177
2178                         for (i = 0; i < addrlen; ++i, ++p) {
2179                                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2180                         }
2181                         hv = (hv ^ (hv >> 16));
2182                 }
2183                 for (i = 0; i < 5; ++i) {
2184                         CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2185
2186                         if (rss.ss_family == AF_INET &&
2187                             ch->ch_Family == AF_INET &&
2188                             sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2189                             ch->ch_Service && strcmp(sep->se_service,
2190                             ch->ch_Service) == 0) {
2191                                 chBest = ch;
2192                                 break;
2193                         }
2194 #ifdef INET6
2195                         if (rss.ss_family == AF_INET6 &&
2196                             ch->ch_Family == AF_INET6 &&
2197                             IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2198                                                &ch->ch_Addr6) != 0 &&
2199                             ch->ch_Service && strcmp(sep->se_service,
2200                             ch->ch_Service) == 0) {
2201                                 chBest = ch;
2202                                 break;
2203                         }
2204 #endif
2205                         if (chBest == NULL || ch->ch_LTime == 0 ||
2206                             ch->ch_LTime < chBest->ch_LTime) {
2207                                 chBest = ch;
2208                         }
2209                 }
2210                 if ((rss.ss_family == AF_INET &&
2211                      (chBest->ch_Family != AF_INET ||
2212                       sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2213                     chBest->ch_Service == NULL ||
2214                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2215                         chBest->ch_Family = sin4->sin_family;
2216                         chBest->ch_Addr4 = sin4->sin_addr;
2217                         if (chBest->ch_Service)
2218                                 free(chBest->ch_Service);
2219                         chBest->ch_Service = strdup(sep->se_service);
2220                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2221                 }
2222 #ifdef INET6
2223                 if ((rss.ss_family == AF_INET6 &&
2224                      (chBest->ch_Family != AF_INET6 ||
2225                       IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2226                                          &chBest->ch_Addr6) == 0)) ||
2227                     chBest->ch_Service == NULL ||
2228                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2229                         chBest->ch_Family = sin6->sin6_family;
2230                         chBest->ch_Addr6 = sin6->sin6_addr;
2231                         if (chBest->ch_Service)
2232                                 free(chBest->ch_Service);
2233                         chBest->ch_Service = strdup(sep->se_service);
2234                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2235                 }
2236 #endif
2237                 chBest->ch_LTime = t;
2238                 {
2239                         CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2240                         if (ct->ct_Ticks != ticks) {
2241                                 ct->ct_Ticks = ticks;
2242                                 ct->ct_Count = 0;
2243                         }
2244                         ++ct->ct_Count;
2245                 }
2246                 for (i = 0; i < CHTSIZE; ++i) {
2247                         CTime *ct = &chBest->ch_Times[i];
2248                         if (ct->ct_Ticks <= ticks &&
2249                             ct->ct_Ticks >= ticks - CHTSIZE) {
2250                                 cnt += ct->ct_Count;
2251                         }
2252                 }
2253                 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) {
2254                         char pname[INET6_ADDRSTRLEN];
2255
2256                         getnameinfo((struct sockaddr *)&rss,
2257                                     ((struct sockaddr *)&rss)->sa_len,
2258                                     pname, sizeof(pname), NULL, 0,
2259                                     NI_NUMERICHOST|NI_WITHSCOPEID);
2260                         r = -1;
2261                         syslog(LOG_ERR,
2262                             "%s from %s exceeded counts/min (limit %d/min)",
2263                             sep->se_service, pname,
2264                             sep->se_maxcpm);
2265                 }
2266         }
2267         return(r);
2268 }
2269
2270 static struct conninfo *
2271 search_conn(struct servtab *sep, int ctrl)
2272 {
2273         struct sockaddr_storage ss;
2274         socklen_t sslen = sizeof(ss);
2275         struct conninfo *conn;
2276         int hv;
2277         char pname[NI_MAXHOST],  pname2[NI_MAXHOST];
2278
2279         if (sep->se_maxperip <= 0)
2280                 return NULL;
2281
2282         /*
2283          * If getpeername() fails, just let it through (if logging is
2284          * enabled the condition is caught elsewhere)
2285          */
2286         if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2287                 return NULL;
2288
2289         switch (ss.ss_family) {
2290         case AF_INET:
2291                 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2292                     sizeof(struct in_addr));
2293                 break;
2294 #ifdef INET6
2295         case AF_INET6:
2296                 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2297                     sizeof(struct in6_addr));
2298                 break;
2299 #endif
2300         default:
2301                 /*
2302                  * Since we only support AF_INET and AF_INET6, just
2303                  * let other than AF_INET and AF_INET6 through.
2304                  */
2305                 return NULL;
2306         }
2307
2308         if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2309             NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
2310                 return NULL;
2311
2312         LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2313                 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2314                     conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2315                     NI_NUMERICHOST | NI_WITHSCOPEID) == 0 &&
2316                     strcmp(pname, pname2) == 0)
2317                         break;
2318         }
2319
2320         if (conn == NULL) {
2321                 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2322                         syslog(LOG_ERR, "malloc: %m");
2323                         exit(EX_OSERR);
2324                 }
2325                 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2326                 if (conn->co_proc == NULL) {
2327                         syslog(LOG_ERR, "malloc: %m");
2328                         exit(EX_OSERR);
2329                 }
2330                 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2331                 conn->co_numchild = 0;
2332                 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2333         }
2334
2335         /*
2336          * Since a child process is not invoked yet, we cannot
2337          * determine a pid of a child.  So, co_proc and co_numchild
2338          * should be filled leter.
2339          */
2340
2341         return conn;
2342 }
2343
2344 static int
2345 room_conn(struct servtab *sep, struct conninfo *conn)
2346 {
2347         char pname[NI_MAXHOST];
2348
2349         if (conn->co_numchild >= sep->se_maxperip) {
2350                 getnameinfo((struct sockaddr *)&conn->co_addr,
2351                     conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2352                     NI_NUMERICHOST | NI_WITHSCOPEID);
2353                 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2354                     sep->se_service, pname, sep->se_maxperip);
2355                 return 0;
2356         }
2357         return 1;
2358 }
2359
2360 static void
2361 addchild_conn(struct conninfo *conn, pid_t pid)
2362 {
2363         struct procinfo *proc;
2364
2365         if (conn == NULL)
2366                 return;
2367
2368         if ((proc = search_proc(pid, 1)) != NULL) {
2369                 if (proc->pr_conn != NULL) {
2370                         syslog(LOG_ERR,
2371                             "addchild_conn: child already on process list");
2372                         exit(EX_OSERR);
2373                 }
2374                 proc->pr_conn = conn;
2375         }
2376
2377         conn->co_proc[conn->co_numchild++] = proc;
2378 }
2379
2380 static void
2381 reapchild_conn(pid_t pid)
2382 {
2383         struct procinfo *proc;
2384         struct conninfo *conn;
2385         int i;
2386
2387         if ((proc = search_proc(pid, 0)) == NULL)
2388                 return;
2389         if ((conn = proc->pr_conn) == NULL)
2390                 return;
2391         for (i = 0; i < conn->co_numchild; ++i)
2392                 if (conn->co_proc[i] == proc) {
2393                         conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2394                         break;
2395                 }
2396         free_proc(proc);
2397         free_conn(conn);
2398 }
2399
2400 static void
2401 resize_conn(struct servtab *sep, int maxpip)
2402 {
2403         struct conninfo *conn;
2404         int i, j;
2405
2406         if (sep->se_maxperip <= 0)
2407                 return;
2408         if (maxpip <= 0) {
2409                 free_connlist(sep);
2410                 return;
2411         }
2412         for (i = 0; i < PERIPSIZE; ++i) {
2413                 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2414                         for (j = maxpip; j < conn->co_numchild; ++j)
2415                                 free_proc(conn->co_proc[j]);
2416                         conn->co_proc = realloc(conn->co_proc,
2417                             maxpip * sizeof(*conn->co_proc));
2418                         if (conn->co_proc == NULL) {
2419                                 syslog(LOG_ERR, "realloc: %m");
2420                                 exit(EX_OSERR);
2421                         }
2422                         if (conn->co_numchild > maxpip)
2423                                 conn->co_numchild = maxpip;
2424                 }
2425         }
2426 }
2427
2428 static void
2429 free_connlist(struct servtab *sep)
2430 {
2431         struct conninfo *conn;
2432         int i, j;
2433
2434         for (i = 0; i < PERIPSIZE; ++i) {
2435                 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2436                         for (j = 0; j < conn->co_numchild; ++j)
2437                                 free_proc(conn->co_proc[j]);
2438                         conn->co_numchild = 0;
2439                         free_conn(conn);
2440                 }
2441         }
2442 }
2443
2444 static void
2445 free_conn(struct conninfo *conn)
2446 {
2447         if (conn == NULL)
2448                 return;
2449         if (conn->co_numchild <= 0) {
2450                 LIST_REMOVE(conn, co_link);
2451                 free(conn->co_proc);
2452                 free(conn);
2453         }
2454 }
2455
2456 static struct procinfo *
2457 search_proc(pid_t pid, int add)
2458 {
2459         struct procinfo *proc;
2460         int hv;
2461
2462         hv = hashval((char *)&pid, sizeof(pid));
2463         LIST_FOREACH(proc, &proctable[hv], pr_link) {
2464                 if (proc->pr_pid == pid)
2465                         break;
2466         }
2467         if (proc == NULL && add) {
2468                 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2469                         syslog(LOG_ERR, "malloc: %m");
2470                         exit(EX_OSERR);
2471                 }
2472                 proc->pr_pid = pid;
2473                 proc->pr_conn = NULL;
2474                 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2475         }
2476         return proc;
2477 }
2478
2479 static void
2480 free_proc(struct procinfo *proc)
2481 {
2482         if (proc == NULL)
2483                 return;
2484         LIST_REMOVE(proc, pr_link);
2485         free(proc);
2486 }
2487
2488 static int
2489 hashval(char *p, int len)
2490 {
2491         int i, hv = 0xABC3D20F;
2492
2493         for (i = 0; i < len; ++i, ++p)
2494                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2495         hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2496         return hv;
2497 }