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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1983, 1991, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)from: inetd.c    8.4 (Berkeley) 4/13/94
  31  * $FreeBSD: src/usr.sbin/inetd/inetd.c,v 1.80.2.11 2003/04/05 13:39:18 dwmalone Exp $
  32  */
  33
  34 /*
  35  * Inetd - Internet super-server
  36  *
  37  * This program invokes all internet services as needed.  Connection-oriented
  38  * services are invoked each time a connection is made, by creating a process.
  39  * This process is passed the connection as file descriptor 0 and is expected
  40  * to do a getpeername to find out the source host and port.
  41  *
  42  * Datagram oriented services are invoked when a datagram
  43  * arrives; a process is created and passed a pending message
  44  * on file descriptor 0.  Datagram servers may either connect
  45  * to their peer, freeing up the original socket for inetd
  46  * to receive further messages on, or ``take over the socket'',
  47  * processing all arriving datagrams and, eventually, timing
  48  * out.  The first type of server is said to be ``multi-threaded'';
  49  * the second type of server ``single-threaded''.
  50  *
  51  * Inetd uses a configuration file which is read at startup
  52  * and, possibly, at some later time in response to a hangup signal.
  53  * The configuration file is ``free format'' with fields given in the
  54  * order shown below.  Continuation lines for an entry must begin with
  55  * a space or tab.  All fields must be present in each entry.
  56  *
  57  *      service name                    must be in /etc/services
  58  *                                      or name a tcpmux service
  59  *                                      or specify a unix domain socket
  60  *      socket type                     stream/dgram/raw/rdm/seqpacket
  61  *      protocol                        tcp[4][6][/ttcp], udp[4][6], unix
  62  *      wait/nowait                     single-threaded/multi-threaded
  63  *      user                            user to run daemon as
  64  *      server program                  full path name
  65  *      server program arguments        maximum of MAXARGS (20)
  66  *
  67  * TCP services without official port numbers are handled with the
  68  * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
  69  * requests. When a connection is made from a foreign host, the service
  70  * requested is passed to tcpmux, which looks it up in the servtab list
  71  * and returns the proper entry for the service. Tcpmux returns a
  72  * negative reply if the service doesn't exist, otherwise the invoked
  73  * server is expected to return the positive reply if the service type in
  74  * inetd.conf file has the prefix "tcpmux/". If the service type has the
  75  * prefix "tcpmux/+", tcpmux will return the positive reply for the
  76  * process; this is for compatibility with older server code, and also
  77  * allows you to invoke programs that use stdin/stdout without putting any
  78  * special server code in them. Services that use tcpmux are "nowait"
  79  * because they do not have a well-known port and hence cannot listen
  80  * for new requests.
  81  *
  82  * For RPC services
  83  *      service name/version            must be in /etc/rpc
  84  *      socket type                     stream/dgram/raw/rdm/seqpacket
  85  *      protocol                        rpc/tcp, rpc/udp
  86  *      wait/nowait                     single-threaded/multi-threaded
  87  *      user                            user to run daemon as
  88  *      server program                  full path name
  89  *      server program arguments        maximum of MAXARGS
  90  *
  91  * Comment lines are indicated by a `#' in column 1.
  92  */
  93 #include <sys/param.h>
  94 #include <sys/ioctl.h>
  95 #include <sys/wait.h>
  96 #include <sys/time.h>
  97 #include <sys/resource.h>
  98 #include <sys/stat.h>
  99 #include <sys/un.h>
 100
 101 #include <netinet/in.h>
 102 #include <netinet/tcp.h>
 103 #include <arpa/inet.h>
 104 #include <rpc/rpc.h>
 105 #include <rpc/pmap_clnt.h>
 106
 107 #include <errno.h>
 108 #include <err.h>
 109 #include <fcntl.h>
 110 #include <grp.h>
 111 #include <limits.h>
 112 #include <netdb.h>
 113 #include <pwd.h>
 114 #include <signal.h>
 115 #include <stdio.h>
 116 #include <stdlib.h>
 117 #include <string.h>
 118 #include <syslog.h>
 119 #include <tcpd.h>
 120 #include <unistd.h>
 121 #include <libutil.h>
 122 #include <sysexits.h>
 123 #include <ctype.h>
 124
 125 #include "inetd.h"
 126 #include "pathnames.h"
 127
 128 /* wrapper for KAME-special getnameinfo() */
 129 #ifndef NI_WITHSCOPEID
 130 #define NI_WITHSCOPEID  0
 131 #endif
 132
 133 #ifndef LIBWRAP_ALLOW_FACILITY
 134 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
 135 #endif
 136 #ifndef LIBWRAP_ALLOW_SEVERITY
 137 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
 138 #endif
 139 #ifndef LIBWRAP_DENY_FACILITY
 140 # define LIBWRAP_DENY_FACILITY LOG_AUTH
 141 #endif
 142 #ifndef LIBWRAP_DENY_SEVERITY
 143 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
 144 #endif
 145
 146 #define ISWRAP(sep)     \
 147            ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
 148         && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
 149         && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
 150             || (sep)->se_socktype == SOCK_DGRAM))
 151
 152 #ifdef LOGIN_CAP
 153 #include <login_cap.h>
 154
 155 /* see init.c */
 156 #define RESOURCE_RC "daemon"
 157
 158 #endif
 159
 160 #ifndef MAXCHILD
 161 #define MAXCHILD        -1              /* maximum number of this service
 162                                            < 0 = no limit */
 163 #endif
 164
 165 #ifndef MAXCPM
 166 #define MAXCPM          -1              /* rate limit invocations from a
 167                                            single remote address,
 168                                            < 0 = no limit */
 169 #endif
 170
 171 #ifndef MAXPERIP
 172 #define MAXPERIP        -1              /* maximum number of this service
 173                                            from a single remote address,
 174                                            < 0 = no limit */
 175 #endif
 176
 177 #ifndef TOOMANY
 178 #define TOOMANY         256             /* don't start more than TOOMANY */
 179 #endif
 180 #define CNT_INTVL       60              /* servers in CNT_INTVL sec. */
 181 #define RETRYTIME       (60*10)         /* retry after bind or server fail */
 182 #define MAX_MAXCHLD     32767           /* max allowable max children */
 183
 184 #define SIGBLOCK        (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
 185
 186 void            close_sep(struct servtab *);
 187 void            flag_signal(int);
 188 void            flag_config(int);
 189 void            config(void);
 190 int             cpmip(const struct servtab *, int);
 191 void            endconfig(void);
 192 struct servtab *enter(struct servtab *);
 193 void            freeconfig(struct servtab *);
 194 struct servtab *getconfigent(void);
 195 int             matchservent(const char *, const char *, const char *);
 196 char           *nextline(FILE *);
 197 void            addchild(struct servtab *, int);
 198 void            flag_reapchild(int);
 199 void            reapchild(void);
 200 void            enable(struct servtab *);
 201 void            disable(struct servtab *);
 202 void            flag_retry(int);
 203 void            retry(void);
 204 int             setconfig(void);
 205 void            setup(struct servtab *);
 206 void            unregisterrpc(struct servtab *sep);
 207 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
 208 static int      room_conn(struct servtab *sep, struct conninfo *conn);
 209 static void     addchild_conn(struct conninfo *conn, pid_t pid);
 210 static void     reapchild_conn(pid_t pid);
 211 static void     free_conn(struct conninfo *conn);
 212 static void     resize_conn(struct servtab *sep, int maxperip);
 213 static void     free_connlist(struct servtab *sep);
 214 static void     free_proc(struct procinfo *);
 215 static struct procinfo *search_proc(pid_t pid, int add);
 216 static int      hashval(char *p, int len);
 217
 218 int     allow_severity;
 219 int     deny_severity;
 220 int     wrap_ex = 0;
 221 int     wrap_bi = 0;
 222 int     debug = 0;
 223 int     dolog = 0;
 224 int     maxsock;                        /* highest-numbered descriptor */
 225 fd_set  allsock;
 226 int     options;
 227 int     timingout;
 228 int     toomany = TOOMANY;
 229 int     maxchild = MAXCHILD;
 230 int     maxcpm = MAXCPM;
 231 int     maxperip = MAXPERIP;
 232 struct  servent *sp;
 233 struct  rpcent *rpc;
 234 char    *hostname = NULL;
 235 struct  sockaddr_in *bind_sa4;
 236 int     no_v4bind = 1;
 237 #ifdef INET6
 238 struct  sockaddr_in6 *bind_sa6;
 239 int     no_v6bind = 1;
 240 #endif
 241 int     signalpipe[2];
 242 #ifdef SANITY_CHECK
 243 int     nsock;
 244 #endif
 245 uid_t   euid;
 246 gid_t   egid;
 247 mode_t  mask;
 248
 249 struct  servtab *servtab;
 250
 251 extern struct biltin biltins[];
 252
 253 #define NUMINT  (sizeof(intab) / sizeof(struct inent))
 254 const char      *CONFIG = _PATH_INETDCONF;
 255 const char      *pid_file = _PATH_INETDPID;
 256
 257 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
 258
 259 int
 260 getvalue(const char *arg, int *value, const char *whine)
 261 {
 262         int  tmp;
 263         char *p;
 264
 265         tmp = strtol(arg, &p, 0);
 266         if (tmp < 0 || *p) {
 267                 syslog(LOG_ERR, whine, arg);
 268                 return 1;                       /* failure */
 269         }
 270         *value = tmp;
 271         return 0;                               /* success */
 272 }
 273
 274 static sa_family_t
 275 whichaf(struct request_info *req)
 276 {
 277         struct sockaddr *sa;
 278
 279         sa = (struct sockaddr *)req->client->sin;
 280         if (sa == NULL)
 281                 return AF_UNSPEC;
 282         if (sa->sa_family == AF_INET6 &&
 283             IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr))
 284                 return AF_INET;
 285         return sa->sa_family;
 286 }
 287
 288 int
 289 main(int argc, char **argv)
 290 {
 291         struct servtab *sep;
 292         struct passwd *pwd;
 293         struct group *grp;
 294         struct sigaction sa, saalrm, sachld, sahup, sapipe;
 295         int ch, dofork;
 296         pid_t pid;
 297         char buf[50];
 298 #ifdef LOGIN_CAP
 299         login_cap_t *lc = NULL;
 300 #endif
 301         struct request_info req;
 302         int denied;
 303         char *service = NULL;
 304         union {
 305                 struct sockaddr peer_un;
 306                 struct sockaddr_in peer_un4;
 307                 struct sockaddr_in6 peer_un6;
 308                 struct sockaddr_storage peer_max;
 309         } p_un;
 310 #define peer    p_un.peer_un
 311 #define peer4   p_un.peer_un4
 312 #define peer6   p_un.peer_un6
 313 #define peermax p_un.peer_max
 314         int i;
 315         struct addrinfo hints, *res;
 316         const char *servname;
 317         int error;
 318         struct conninfo *conn;
 319
 320         openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
 321
 322         while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
 323                 switch(ch) {
 324                 case 'd':
 325                         debug = 1;
 326                         options |= SO_DEBUG;
 327                         break;
 328                 case 'l':
 329                         dolog = 1;
 330                         break;
 331                 case 'R':
 332                         getvalue(optarg, &toomany,
 333                                 "-R %s: bad value for service invocation rate");
 334                         break;
 335                 case 'c':
 336                         getvalue(optarg, &maxchild,
 337                                 "-c %s: bad value for maximum children");
 338                         break;
 339                 case 'C':
 340                         getvalue(optarg, &maxcpm,
 341                                 "-C %s: bad value for maximum children/minute");
 342                         break;
 343                 case 'a':
 344                         hostname = optarg;
 345                         break;
 346                 case 'p':
 347                         pid_file = optarg;
 348                         break;
 349                 case 's':
 350                         getvalue(optarg, &maxperip,
 351                                 "-s %s: bad value for maximum children per source address");
 352                         break;
 353                 case 'w':
 354                         wrap_ex++;
 355                         break;
 356                 case 'W':
 357                         wrap_bi++;
 358                         break;
 359                 case '?':
 360                 default:
 361                         syslog(LOG_ERR,
 362                                 "usage: inetd [-dlwW] [-a address] [-R rate]"
 363                                 " [-c maximum] [-C rate]"
 364                                 " [-p pidfile] [conf-file]");
 365                         exit(EX_USAGE);
 366                 }
 367         /*
 368          * Initialize Bind Addrs.
 369          *   When hostname is NULL, wild card bind addrs are obtained from
 370          *   getaddrinfo(). But getaddrinfo() requires at least one of
 371          *   hostname or servname is non NULL.
 372          *   So when hostname is NULL, set dummy value to servname.
 373          */
 374         servname = (hostname == NULL) ? "discard" /* dummy */ : NULL;
 375
 376         bzero(&hints, sizeof(struct addrinfo));
 377         hints.ai_flags = AI_PASSIVE;
 378         hints.ai_family = AF_UNSPEC;
 379         error = getaddrinfo(hostname, servname, &hints, &res);
 380         if (error != 0) {
 381                 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
 382                 if (error == EAI_SYSTEM)
 383                         syslog(LOG_ERR, "%s", strerror(errno));
 384                 exit(EX_USAGE);
 385         }
 386         do {
 387                 if (res->ai_addr == NULL) {
 388                         syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
 389                         exit(EX_USAGE);
 390                 }
 391                 switch (res->ai_addr->sa_family) {
 392                 case AF_INET:
 393                         if (no_v4bind == 0)
 394                                 continue;
 395                         bind_sa4 = (struct sockaddr_in *)res->ai_addr;
 396                         /* init port num in case servname is dummy */
 397                         bind_sa4->sin_port = 0;
 398                         no_v4bind = 0;
 399                         continue;
 400 #ifdef INET6
 401                 case AF_INET6:
 402                         if (no_v6bind == 0)
 403                                 continue;
 404                         bind_sa6 = (struct sockaddr_in6 *)res->ai_addr;
 405                         /* init port num in case servname is dummy */
 406                         bind_sa6->sin6_port = 0;
 407                         no_v6bind = 0;
 408                         continue;
 409 #endif
 410                 }
 411                 if (no_v4bind == 0
 412 #ifdef INET6
 413                     && no_v6bind == 0
 414 #endif
 415                     )
 416                         break;
 417         } while ((res = res->ai_next) != NULL);
 418         if (no_v4bind != 0
 419 #ifdef INET6
 420             && no_v6bind != 0
 421 #endif
 422             ) {
 423                 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
 424                 exit(EX_USAGE);
 425         }
 426
 427         euid = geteuid();
 428         egid = getegid();
 429         umask(mask = umask(0777));
 430
 431         argc -= optind;
 432         argv += optind;
 433
 434         if (argc > 0)
 435                 CONFIG = argv[0];
 436         if (debug == 0) {
 437                 FILE *fp;
 438                 if (daemon(0, 0) < 0) {
 439                         syslog(LOG_WARNING, "daemon(0,0) failed: %m");
 440                 }
 441                 /* From now on we don't want syslog messages going to stderr. */
 442                 closelog();
 443                 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
 444                 /*
 445                  * In case somebody has started inetd manually, we need to
 446                  * clear the logname, so that old servers run as root do not
 447                  * get the user's logname..
 448                  */
 449                 if (setlogin("") < 0) {
 450                         syslog(LOG_WARNING, "cannot clear logname: %m");
 451                         /* no big deal if it fails.. */
 452                 }
 453                 pid = getpid();
 454                 fp = fopen(pid_file, "w");
 455                 if (fp) {
 456                         fprintf(fp, "%ld\n", (long)pid);
 457                         fclose(fp);
 458                 } else {
 459                         syslog(LOG_WARNING, "%s: %m", pid_file);
 460                 }
 461         }
 462         for (i = 0; i < PERIPSIZE; ++i)
 463                 LIST_INIT(&proctable[i]);
 464         sa.sa_flags = 0;
 465         sigemptyset(&sa.sa_mask);
 466         sigaddset(&sa.sa_mask, SIGALRM);
 467         sigaddset(&sa.sa_mask, SIGCHLD);
 468         sigaddset(&sa.sa_mask, SIGHUP);
 469         sa.sa_handler = flag_retry;
 470         sigaction(SIGALRM, &sa, &saalrm);
 471         config();
 472         sa.sa_handler = flag_config;
 473         sigaction(SIGHUP, &sa, &sahup);
 474         sa.sa_handler = flag_reapchild;
 475         sigaction(SIGCHLD, &sa, &sachld);
 476         sa.sa_handler = SIG_IGN;
 477         sigaction(SIGPIPE, &sa, &sapipe);
 478
 479         {
 480                 /* space for daemons to overwrite environment for ps */
 481 #define DUMMYSIZE       100
 482                 char dummy[DUMMYSIZE];
 483
 484                 memset(dummy, 'x', DUMMYSIZE - 1);
 485                 dummy[DUMMYSIZE - 1] = '\0';
 486                 if (setenv("inetd_dummy", dummy, 1) == -1)
 487                         syslog(LOG_WARNING, "setenv: cannot set inetd_dummy=%s: %m", dummy);
 488
 489         }
 490
 491         if (pipe2(signalpipe, O_CLOEXEC) != 0) {
 492                 syslog(LOG_ERR, "pipe2 (O_CLOEXEC): %m");
 493                 exit(EX_OSERR);
 494         }
 495         FD_SET(signalpipe[0], &allsock);
 496 #ifdef SANITY_CHECK
 497         nsock++;
 498 #endif
 499         if (signalpipe[0] > maxsock)
 500             maxsock = signalpipe[0];
 501         if (signalpipe[1] > maxsock)
 502             maxsock = signalpipe[1];
 503
 504         for (;;) {
 505             int n, ctrl;
 506             fd_set readable;
 507
 508 #ifdef SANITY_CHECK
 509             if (nsock == 0) {
 510                 syslog(LOG_ERR, "%s: nsock=0", __func__);
 511                 exit(EX_SOFTWARE);
 512             }
 513 #endif
 514             readable = allsock;
 515             if ((n = select(maxsock + 1, &readable, NULL, NULL, NULL)) <= 0) {
 516                     if (n < 0 && errno != EINTR) {
 517                         syslog(LOG_WARNING, "select: %m");
 518                         sleep(1);
 519                     }
 520                     continue;
 521             }
 522             /* handle any queued signal flags */
 523             if (FD_ISSET(signalpipe[0], &readable)) {
 524                 int nsig;
 525                 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
 526                     syslog(LOG_ERR, "ioctl: %m");
 527                     exit(EX_OSERR);
 528                 }
 529                 while (--nsig >= 0) {
 530                     char c;
 531                     if (read(signalpipe[0], &c, 1) != 1) {
 532                         syslog(LOG_ERR, "read: %m");
 533                         exit(EX_OSERR);
 534                     }
 535                     if (debug)
 536                         warnx("handling signal flag %c", c);
 537                     switch(c) {
 538                     case 'A': /* sigalrm */
 539                         retry();
 540                         break;
 541                     case 'C': /* sigchld */
 542                         reapchild();
 543                         break;
 544                     case 'H': /* sighup */
 545                         config();
 546                         break;
 547                     }
 548                 }
 549             }
 550             for (sep = servtab; n && sep; sep = sep->se_next)
 551                 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
 552                     n--;
 553                     if (debug)
 554                             warnx("someone wants %s", sep->se_service);
 555                     dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
 556                     conn = NULL;
 557                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
 558                             i = 1;
 559                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 560                                     syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
 561                             ctrl = accept(sep->se_fd, NULL, NULL);
 562                             if (debug)
 563                                     warnx("accept, ctrl %d", ctrl);
 564                             if (ctrl < 0) {
 565                                     if (errno != EINTR)
 566                                             syslog(LOG_WARNING,
 567                                                 "accept (for %s): %m",
 568                                                 sep->se_service);
 569                                       if (sep->se_accept &&
 570                                           sep->se_socktype == SOCK_STREAM)
 571                                               close(ctrl);
 572                                     continue;
 573                             }
 574                             i = 0;
 575                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 576                                     syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
 577                             if (ioctl(ctrl, FIONBIO, &i) < 0)
 578                                     syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
 579                             if (cpmip(sep, ctrl) < 0) {
 580                                 close(ctrl);
 581                                 continue;
 582                             }
 583                             if (dofork &&
 584                                 (conn = search_conn(sep, ctrl)) != NULL &&
 585                                 !room_conn(sep, conn)) {
 586                                 close(ctrl);
 587                                 continue;
 588                             }
 589                     } else
 590                             ctrl = sep->se_fd;
 591                     if (dolog && !ISWRAP(sep)) {
 592                             char pname[INET6_ADDRSTRLEN] = "unknown";
 593                             socklen_t sl;
 594                             sl = sizeof peermax;
 595                             if (getpeername(ctrl, (struct sockaddr *)
 596                                             &peermax, &sl)) {
 597                                     sl = sizeof peermax;
 598                                     if (recvfrom(ctrl, buf, sizeof(buf),
 599                                         MSG_PEEK,
 600                                         (struct sockaddr *)&peermax,
 601                                         &sl) >= 0) {
 602                                       getnameinfo((struct sockaddr *)&peermax,
 603                                                   peer.sa_len,
 604                                                   pname, sizeof(pname),
 605                                                   NULL, 0,
 606                                                   NI_NUMERICHOST|
 607                                                   NI_WITHSCOPEID);
 608                                     }
 609                             } else {
 610                                     getnameinfo((struct sockaddr *)&peermax,
 611                                                 peer.sa_len,
 612                                                 pname, sizeof(pname),
 613                                                 NULL, 0,
 614                                                 NI_NUMERICHOST|
 615                                                 NI_WITHSCOPEID);
 616                             }
 617                             syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
 618                     }
 619                     sigblock(SIGBLOCK);
 620                     pid = 0;
 621                     /*
 622                      * Fork for all external services, builtins which need to
 623                      * fork and anything we're wrapping (as wrapping might
 624                      * block or use hosts_options(5) twist).
 625                      */
 626                     if (dofork) {
 627                             if (sep->se_count++ == 0)
 628                                 gettimeofday(&sep->se_time, NULL);
 629                             else if (toomany > 0 && sep->se_count >= toomany) {
 630                                 struct timeval now;
 631
 632                                 gettimeofday(&now, NULL);
 633                                 if (now.tv_sec - sep->se_time.tv_sec >
 634                                     CNT_INTVL) {
 635                                         sep->se_time = now;
 636                                         sep->se_count = 1;
 637                                 } else {
 638                                         syslog(LOG_ERR,
 639                         "%s/%s server failing (looping), service terminated",
 640                                             sep->se_service, sep->se_proto);
 641                                         if (sep->se_accept &&
 642                                             sep->se_socktype == SOCK_STREAM)
 643                                                 close(ctrl);
 644                                         close_sep(sep);
 645                                         free_conn(conn);
 646                                         sigsetmask(0L);
 647                                         if (!timingout) {
 648                                                 timingout = 1;
 649                                                 alarm(RETRYTIME);
 650                                         }
 651                                         continue;
 652                                 }
 653                             }
 654                             pid = fork();
 655                     }
 656                     if (pid < 0) {
 657                             syslog(LOG_ERR, "fork: %m");
 658                             if (sep->se_accept &&
 659                                 sep->se_socktype == SOCK_STREAM)
 660                                     close(ctrl);
 661                             free_conn(conn);
 662                             sigsetmask(0L);
 663                             sleep(1);
 664                             continue;
 665                     }
 666                     if (pid) {
 667                         addchild_conn(conn, pid);
 668                         addchild(sep, pid);
 669                     }
 670                     sigsetmask(0L);
 671                     if (pid == 0) {
 672                             if (dofork) {
 673                                 sigaction(SIGALRM, &saalrm, NULL);
 674                                 sigaction(SIGCHLD, &sachld, NULL);
 675                                 sigaction(SIGHUP, &sahup, NULL);
 676                                 /* SIGPIPE reset before exec */
 677                             }
 678                             /*
 679                              * Call tcpmux to find the real service to exec.
 680                              */
 681                             if (sep->se_bi &&
 682                                 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
 683                                     sep = tcpmux(ctrl);
 684                                     if (sep == NULL) {
 685                                             close(ctrl);
 686                                             _exit(0);
 687                                     }
 688                             }
 689                             if (ISWRAP(sep)) {
 690                                 inetd_setproctitle("wrapping", ctrl);
 691                                 service = sep->se_server_name ?
 692                                     sep->se_server_name : sep->se_service;
 693                                 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL);
 694                                 fromhost(&req);
 695                                 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
 696                                 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
 697                                 denied = !hosts_access(&req);
 698                                 if (denied) {
 699                                     syslog(deny_severity,
 700                                         "refused connection from %.500s, service %s (%s%s)",
 701                                         eval_client(&req), service, sep->se_proto,
 702                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 703                                     if (sep->se_socktype != SOCK_STREAM)
 704                                         recv(ctrl, buf, sizeof (buf), 0);
 705                                     if (dofork) {
 706                                         sleep(1);
 707                                         _exit(0);
 708                                     }
 709                                 }
 710                                 if (dolog) {
 711                                     syslog(allow_severity,
 712                                         "connection from %.500s, service %s (%s%s)",
 713                                         eval_client(&req), service, sep->se_proto,
 714                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 715                                 }
 716                             }
 717                             if (sep->se_bi) {
 718                                 (*sep->se_bi->bi_fn)(ctrl, sep);
 719                             } else {
 720                                 if (debug)
 721                                         warnx("%d execl %s",
 722                                                 getpid(), sep->se_server);
 723                                 /* Clear close-on-exec. */
 724                                 if (fcntl(ctrl, F_SETFD, 0) < 0) {
 725                                         syslog(LOG_ERR,
 726                                             "%s/%s: fcntl (F_SETFD, 0): %m",
 727                                                 sep->se_service, sep->se_proto);
 728                                         _exit(EX_OSERR);
 729                                 }
 730                                 if (ctrl != 0) {
 731                                         dup2(ctrl, 0);
 732                                         close(ctrl);
 733                                 }
 734                                 dup2(0, 1);
 735                                 dup2(0, 2);
 736                                 if ((pwd = getpwnam(sep->se_user)) == NULL) {
 737                                         syslog(LOG_ERR,
 738                                             "%s/%s: %s: no such user",
 739                                                 sep->se_service, sep->se_proto,
 740                                                 sep->se_user);
 741                                         if (sep->se_socktype != SOCK_STREAM)
 742                                                 recv(0, buf, sizeof (buf), 0);
 743                                         _exit(EX_NOUSER);
 744                                 }
 745                                 grp = NULL;
 746                                 if (   sep->se_group != NULL
 747                                     && (grp = getgrnam(sep->se_group)) == NULL
 748                                    ) {
 749                                         syslog(LOG_ERR,
 750                                             "%s/%s: %s: no such group",
 751                                                 sep->se_service, sep->se_proto,
 752                                                 sep->se_group);
 753                                         if (sep->se_socktype != SOCK_STREAM)
 754                                                 recv(0, buf, sizeof (buf), 0);
 755                                         _exit(EX_NOUSER);
 756                                 }
 757                                 if (grp != NULL)
 758                                         pwd->pw_gid = grp->gr_gid;
 759 #ifdef LOGIN_CAP
 760                                 if ((lc = login_getclass(sep->se_class)) == NULL) {
 761                                         /* error syslogged by getclass */
 762                                         syslog(LOG_ERR,
 763                                             "%s/%s: %s: login class error",
 764                                                 sep->se_service, sep->se_proto,
 765                                                 sep->se_class);
 766                                         if (sep->se_socktype != SOCK_STREAM)
 767                                                 recv(0, buf, sizeof (buf), 0);
 768                                         _exit(EX_NOUSER);
 769                                 }
 770 #endif
 771                                 if (setsid() < 0) {
 772                                         syslog(LOG_ERR,
 773                                                 "%s: can't setsid(): %m",
 774                                                  sep->se_service);
 775                                         /* _exit(EX_OSERR); not fatal yet */
 776                                 }
 777 #ifdef LOGIN_CAP
 778                                 if (setusercontext(lc, pwd, pwd->pw_uid,
 779                                     LOGIN_SETALL) != 0) {
 780                                         syslog(LOG_ERR,
 781                                          "%s: can't setusercontext(..%s..): %m",
 782                                          sep->se_service, sep->se_user);
 783                                         _exit(EX_OSERR);
 784                                 }
 785                                 login_close(lc);
 786 #else
 787                                 if (pwd->pw_uid) {
 788                                         if (setlogin(sep->se_user) < 0) {
 789                                                 syslog(LOG_ERR,
 790                                                  "%s: can't setlogin(%s): %m",
 791                                                  sep->se_service, sep->se_user);
 792                                                 /* _exit(EX_OSERR); not yet */
 793                                         }
 794                                         if (setgid(pwd->pw_gid) < 0) {
 795                                                 syslog(LOG_ERR,
 796                                                   "%s: can't set gid %d: %m",
 797                                                   sep->se_service, pwd->pw_gid);
 798                                                 _exit(EX_OSERR);
 799                                         }
 800                                         initgroups(pwd->pw_name,
 801                                                         pwd->pw_gid);
 802                                         if (setuid(pwd->pw_uid) < 0) {
 803                                                 syslog(LOG_ERR,
 804                                                   "%s: can't set uid %d: %m",
 805                                                   sep->se_service, pwd->pw_uid);
 806                                                 _exit(EX_OSERR);
 807                                         }
 808                                 }
 809 #endif
 810                                 sigaction(SIGPIPE, &sapipe, NULL);
 811                                 execv(sep->se_server, sep->se_argv);
 812                                 syslog(LOG_ERR,
 813                                     "cannot execute %s: %m", sep->se_server);
 814                                 if (sep->se_socktype != SOCK_STREAM)
 815                                         recv(0, buf, sizeof (buf), 0);
 816                             }
 817                             if (dofork)
 818                                 _exit(0);
 819                     }
 820                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
 821                             close(ctrl);
 822                 }
 823         }
 824 }
 825
 826 /*
 827  * Add a signal flag to the signal flag queue for later handling
 828  */
 829
 830 void
 831 flag_signal(int c)
 832 {
 833         char ch = c;
 834
 835         if (write(signalpipe[1], &ch, 1) != 1) {
 836                 syslog(LOG_ERR, "write: %m");
 837                 _exit(EX_OSERR);
 838         }
 839 }
 840
 841 /*
 842  * Record a new child pid for this service. If we've reached the
 843  * limit on children, then stop accepting incoming requests.
 844  */
 845
 846 void
 847 addchild(struct servtab *sep, pid_t pid)
 848 {
 849         if (sep->se_maxchild <= 0)
 850                 return;
 851 #ifdef SANITY_CHECK
 852         if (sep->se_numchild >= sep->se_maxchild) {
 853                 syslog(LOG_ERR, "%s: %d >= %d",
 854                     __func__, sep->se_numchild, sep->se_maxchild);
 855                 exit(EX_SOFTWARE);
 856         }
 857 #endif
 858         sep->se_pids[sep->se_numchild++] = pid;
 859         if (sep->se_numchild == sep->se_maxchild)
 860                 disable(sep);
 861 }
 862
 863 /*
 864  * Some child process has exited. See if it's on somebody's list.
 865  */
 866
 867 void
 868 flag_reapchild(int signo __unused)
 869 {
 870         flag_signal('C');
 871 }
 872
 873 void
 874 reapchild(void)
 875 {
 876         int k, status;
 877         pid_t pid;
 878         struct servtab *sep;
 879
 880         for (;;) {
 881                 pid = wait3(&status, WNOHANG, NULL);
 882                 if (pid <= 0)
 883                         break;
 884                 if (debug)
 885                         warnx("%d reaped, %s %u", pid,
 886                             WIFEXITED(status) ? "status" : "signal",
 887                             WIFEXITED(status) ? WEXITSTATUS(status)
 888                                 : WTERMSIG(status));
 889                 for (sep = servtab; sep; sep = sep->se_next) {
 890                         for (k = 0; k < sep->se_numchild; k++)
 891                                 if (sep->se_pids[k] == pid)
 892                                         break;
 893                         if (k == sep->se_numchild)
 894                                 continue;
 895                         if (sep->se_numchild == sep->se_maxchild)
 896                                 enable(sep);
 897                         sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
 898                         if (WIFSIGNALED(status) || WEXITSTATUS(status))
 899                                 syslog(LOG_WARNING,
 900                                     "%s[%d]: exited, %s %u",
 901                                     sep->se_server, pid,
 902                                     WIFEXITED(status) ? "status" : "signal",
 903                                     WIFEXITED(status) ? WEXITSTATUS(status)
 904                                         : WTERMSIG(status));
 905                         break;
 906                 }
 907                 reapchild_conn(pid);
 908         }
 909 }
 910
 911 void
 912 flag_config(int signo __unused)
 913 {
 914         flag_signal('H');
 915 }
 916
 917 void
 918 config(void)
 919 {
 920         struct servtab *sep, *new, **sepp;
 921         long omask;
 922 #ifdef LOGIN_CAP
 923         login_cap_t *lc = NULL;
 924 #endif
 925
 926
 927         if (!setconfig()) {
 928                 syslog(LOG_ERR, "%s: %m", CONFIG);
 929                 return;
 930         }
 931         for (sep = servtab; sep; sep = sep->se_next)
 932                 sep->se_checked = 0;
 933         while ((new = getconfigent())) {
 934                 if (getpwnam(new->se_user) == NULL) {
 935                         syslog(LOG_ERR,
 936                                 "%s/%s: no such user '%s', service ignored",
 937                                 new->se_service, new->se_proto, new->se_user);
 938                         continue;
 939                 }
 940                 if (new->se_group && getgrnam(new->se_group) == NULL) {
 941                         syslog(LOG_ERR,
 942                                 "%s/%s: no such group '%s', service ignored",
 943                                 new->se_service, new->se_proto, new->se_group);
 944                         continue;
 945                 }
 946 #ifdef LOGIN_CAP
 947                 if ((lc = login_getclass(new->se_class)) == NULL) {
 948                         /* error syslogged by getclass */
 949                         syslog(LOG_ERR,
 950                                 "%s/%s: %s: login class error, service ignored",
 951                                 new->se_service, new->se_proto, new->se_class);
 952                         continue;
 953                 }
 954                 login_close(lc);
 955 #endif
 956                 for (sep = servtab; sep; sep = sep->se_next)
 957                         if (strcmp(sep->se_service, new->se_service) == 0 &&
 958                             strcmp(sep->se_proto, new->se_proto) == 0 &&
 959                             sep->se_socktype == new->se_socktype &&
 960                             sep->se_family == new->se_family)
 961                                 break;
 962                 if (sep != NULL) {
 963                         int i;
 964
 965 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; }
 966                         omask = sigblock(SIGBLOCK);
 967                         if (sep->se_nomapped != new->se_nomapped) {
 968                                 sep->se_nomapped = new->se_nomapped;
 969                                 sep->se_reset = 1;
 970                         }
 971                         /* copy over outstanding child pids */
 972                         if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
 973                                 new->se_numchild = sep->se_numchild;
 974                                 if (new->se_numchild > new->se_maxchild)
 975                                         new->se_numchild = new->se_maxchild;
 976                                 memcpy(new->se_pids, sep->se_pids,
 977                                     new->se_numchild * sizeof(*new->se_pids));
 978                         }
 979                         SWAP(sep->se_pids, new->se_pids);
 980                         sep->se_maxchild = new->se_maxchild;
 981                         sep->se_numchild = new->se_numchild;
 982                         sep->se_maxcpm = new->se_maxcpm;
 983                         resize_conn(sep, new->se_maxperip);
 984                         sep->se_maxperip = new->se_maxperip;
 985                         sep->se_bi = new->se_bi;
 986                         /* might need to turn on or off service now */
 987                         if (sep->se_fd >= 0) {
 988                               if (sep->se_maxchild > 0
 989                                   && sep->se_numchild == sep->se_maxchild) {
 990                                       if (FD_ISSET(sep->se_fd, &allsock))
 991                                           disable(sep);
 992                               } else {
 993                                       if (!FD_ISSET(sep->se_fd, &allsock))
 994                                           enable(sep);
 995                               }
 996                         }
 997                         sep->se_accept = new->se_accept;
 998                         SWAP(sep->se_user, new->se_user);
 999                         SWAP(sep->se_group, new->se_group);
1000 #ifdef LOGIN_CAP
1001                         SWAP(sep->se_class, new->se_class);
1002 #endif
1003                         SWAP(sep->se_server, new->se_server);
1004                         SWAP(sep->se_server_name, new->se_server_name);
1005                         for (i = 0; i < MAXARGV; i++)
1006                                 SWAP(sep->se_argv[i], new->se_argv[i]);
1007                         sigsetmask(omask);
1008                         freeconfig(new);
1009                         if (debug)
1010                                 print_service("REDO", sep);
1011                 } else {
1012                         sep = enter(new);
1013                         if (debug)
1014                                 print_service("ADD ", sep);
1015                 }
1016                 sep->se_checked = 1;
1017                 if (ISMUX(sep)) {
1018                         sep->se_fd = -1;
1019                         continue;
1020                 }
1021                 switch (sep->se_family) {
1022                 case AF_INET:
1023                         if (no_v4bind != 0) {
1024                                 sep->se_fd = -1;
1025                                 continue;
1026                         }
1027                         break;
1028 #ifdef INET6
1029                 case AF_INET6:
1030                         if (no_v6bind != 0) {
1031                                 sep->se_fd = -1;
1032                                 continue;
1033                         }
1034                         break;
1035 #endif
1036                 }
1037                 if (!sep->se_rpc) {
1038                         if (sep->se_family != AF_UNIX) {
1039                                 sp = getservbyname(sep->se_service, sep->se_proto);
1040                                 if (sp == NULL) {
1041                                         syslog(LOG_ERR, "%s/%s: unknown service",
1042                                         sep->se_service, sep->se_proto);
1043                                         sep->se_checked = 0;
1044                                         continue;
1045                                 }
1046                         }
1047                         switch (sep->se_family) {
1048                         case AF_INET:
1049                                 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1050                                         sep->se_ctrladdr4.sin_port =
1051                                                 sp->s_port;
1052                                         sep->se_reset = 1;
1053                                 }
1054                                 break;
1055 #ifdef INET6
1056                         case AF_INET6:
1057                                 if (sp->s_port !=
1058                                     sep->se_ctrladdr6.sin6_port) {
1059                                         sep->se_ctrladdr6.sin6_port =
1060                                                 sp->s_port;
1061                                         sep->se_reset = 1;
1062                                 }
1063                                 break;
1064 #endif
1065                         }
1066                         if (sep->se_reset != 0 && sep->se_fd >= 0)
1067                                 close_sep(sep);
1068                 } else {
1069                         rpc = getrpcbyname(sep->se_service);
1070                         if (rpc == NULL) {
1071                                 syslog(LOG_ERR, "%s/%s unknown RPC service",
1072                                         sep->se_service, sep->se_proto);
1073                                 if (sep->se_fd != -1)
1074                                         close(sep->se_fd);
1075                                 sep->se_fd = -1;
1076                                         continue;
1077                         }
1078                         if (rpc->r_number != sep->se_rpc_prog) {
1079                                 if (sep->se_rpc_prog)
1080                                         unregisterrpc(sep);
1081                                 sep->se_rpc_prog = rpc->r_number;
1082                                 if (sep->se_fd != -1)
1083                                         close(sep->se_fd);
1084                                 sep->se_fd = -1;
1085                         }
1086                 }
1087                 if (sep->se_fd == -1)
1088                         setup(sep);
1089         }
1090         endconfig();
1091         /*
1092          * Purge anything not looked at above.
1093          */
1094         omask = sigblock(SIGBLOCK);
1095         sepp = &servtab;
1096         while ((sep = *sepp)) {
1097                 if (sep->se_checked) {
1098                         sepp = &sep->se_next;
1099                         continue;
1100                 }
1101                 *sepp = sep->se_next;
1102                 if (sep->se_fd >= 0)
1103                         close_sep(sep);
1104                 if (debug)
1105                         print_service("FREE", sep);
1106                 if (sep->se_rpc && sep->se_rpc_prog > 0)
1107                         unregisterrpc(sep);
1108                 freeconfig(sep);
1109                 free(sep);
1110         }
1111         sigsetmask(omask);
1112 }
1113
1114 void
1115 unregisterrpc(struct servtab *sep)
1116 {
1117         u_int i;
1118         struct servtab *sepp;
1119         long omask;
1120
1121         omask = sigblock(SIGBLOCK);
1122         for (sepp = servtab; sepp; sepp = sepp->se_next) {
1123                 if (sepp == sep)
1124                         continue;
1125                 if (sep->se_checked == 0 ||
1126                     !sepp->se_rpc ||
1127                     sep->se_rpc_prog != sepp->se_rpc_prog)
1128                         continue;
1129                 return;
1130         }
1131         if (debug)
1132                 print_service("UNREG", sep);
1133         for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++)
1134                 pmap_unset(sep->se_rpc_prog, i);
1135         if (sep->se_fd != -1)
1136                 close(sep->se_fd);
1137         sep->se_fd = -1;
1138         sigsetmask(omask);
1139 }
1140
1141 void
1142 flag_retry(int signo __unused)
1143 {
1144         flag_signal('A');
1145 }
1146
1147 void
1148 retry(void)
1149 {
1150         struct servtab *sep;
1151
1152         timingout = 0;
1153         for (sep = servtab; sep; sep = sep->se_next)
1154                 if (sep->se_fd == -1 && !ISMUX(sep))
1155                         setup(sep);
1156 }
1157
1158 void
1159 setup(struct servtab *sep)
1160 {
1161         int on = 1;
1162
1163         if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1164                 if (debug)
1165                         warn("socket failed on %s/%s",
1166                                 sep->se_service, sep->se_proto);
1167                 syslog(LOG_ERR, "%s/%s: socket: %m",
1168                     sep->se_service, sep->se_proto);
1169                 return;
1170         }
1171         /* Set all listening sockets to close-on-exec. */
1172         if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) {
1173                 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m",
1174                     sep->se_service, sep->se_proto);
1175                 close(sep->se_fd);
1176                 return;
1177         }
1178 #define turnon(fd, opt) \
1179 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1180         if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1181             turnon(sep->se_fd, SO_DEBUG) < 0)
1182                 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1183         if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1184                 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1185 #ifdef SO_PRIVSTATE
1186         if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1187                 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1188 #endif
1189         /* tftpd opens a new connection then needs more infos */
1190         if ((sep->se_family == AF_INET6) &&
1191             (strcmp(sep->se_proto, "udp") == 0) &&
1192             (sep->se_accept == 0) &&
1193             (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO,
1194                         (char *)&on, sizeof (on)) < 0))
1195                 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1196         if (sep->se_family == AF_INET6) {
1197                 int flag = sep->se_nomapped ? 1 : 0;
1198                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1199                                (char *)&flag, sizeof (flag)) < 0)
1200                         syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1201         }
1202 #undef turnon
1203         if (sep->se_type == TTCP_TYPE)
1204                 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH,
1205                     (char *)&on, sizeof (on)) < 0)
1206                         syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m");
1207         if (sep->se_family == AF_UNIX) {
1208                 unlink(sep->se_ctrladdr_un.sun_path);
1209                 umask(0777); /* Make socket with conservative permissions */
1210         }
1211         if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1212             sep->se_ctrladdr_size) < 0) {
1213                 if (debug)
1214                         warn("bind failed on %s/%s",
1215                                 sep->se_service, sep->se_proto);
1216                 syslog(LOG_ERR, "%s/%s: bind: %m",
1217                     sep->se_service, sep->se_proto);
1218                 close(sep->se_fd);
1219                 sep->se_fd = -1;
1220                 if (!timingout) {
1221                         timingout = 1;
1222                         alarm(RETRYTIME);
1223                 }
1224                 if (sep->se_family == AF_UNIX)
1225                         umask(mask);
1226                 return;
1227         }
1228         if (sep->se_family == AF_UNIX) {
1229                 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1230                 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1231                         syslog(LOG_ERR, "chown socket: %m");
1232                 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1233                         syslog(LOG_ERR, "chmod socket: %m");
1234                 umask(mask);
1235         }
1236         if (sep->se_rpc) {
1237                 u_int i;
1238                 socklen_t len = sep->se_ctrladdr_size;
1239
1240                 if (sep->se_family != AF_INET) {
1241                         syslog(LOG_ERR,
1242                                "%s/%s: unsupported address family for rpc",
1243                                sep->se_service, sep->se_proto);
1244                         close(sep->se_fd);
1245                         sep->se_fd = -1;
1246                         return;
1247                 }
1248                 if (getsockname(sep->se_fd,
1249                                 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1250                         syslog(LOG_ERR, "%s/%s: getsockname: %m",
1251                                sep->se_service, sep->se_proto);
1252                         close(sep->se_fd);
1253                         sep->se_fd = -1;
1254                         return;
1255                 }
1256                 if (debug)
1257                         print_service("REG ", sep);
1258                 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1259                         pmap_unset(sep->se_rpc_prog, i);
1260                         pmap_set(sep->se_rpc_prog, i,
1261                                  (sep->se_socktype == SOCK_DGRAM)
1262                                  ? IPPROTO_UDP : IPPROTO_TCP,
1263                                  ntohs(sep->se_ctrladdr4.sin_port));
1264                 }
1265         }
1266         if (sep->se_socktype == SOCK_STREAM)
1267                 listen(sep->se_fd, 64);
1268         enable(sep);
1269         if (debug) {
1270                 warnx("registered %s on %d",
1271                         sep->se_server, sep->se_fd);
1272         }
1273 }
1274
1275 /*
1276  * Finish with a service and its socket.
1277  */
1278 void
1279 close_sep(struct servtab *sep)
1280 {
1281         if (sep->se_fd >= 0) {
1282                 if (FD_ISSET(sep->se_fd, &allsock))
1283                         disable(sep);
1284                 close(sep->se_fd);
1285                 sep->se_fd = -1;
1286         }
1287         sep->se_count = 0;
1288         sep->se_numchild = 0;   /* forget about any existing children */
1289 }
1290
1291 int
1292 matchservent(const char *name1, const char *name2, const char *proto)
1293 {
1294         char **alias, *p;
1295         struct servent *se;
1296
1297         if (strcmp(proto, "unix") == 0) {
1298                 if ((p = strrchr(name1, '/')) != NULL)
1299                         name1 = p + 1;
1300                 if ((p = strrchr(name2, '/')) != NULL)
1301                         name2 = p + 1;
1302         }
1303         if (strcmp(name1, name2) == 0)
1304                 return(1);
1305         if ((se = getservbyname(name1, proto)) != NULL) {
1306                 if (strcmp(name2, se->s_name) == 0)
1307                         return(1);
1308                 for (alias = se->s_aliases; *alias; alias++)
1309                         if (strcmp(name2, *alias) == 0)
1310                                 return(1);
1311         }
1312         return(0);
1313 }
1314
1315 struct servtab *
1316 enter(struct servtab *cp)
1317 {
1318         struct servtab *sep;
1319         long omask;
1320
1321         sep = (struct servtab *)malloc(sizeof (*sep));
1322         if (sep == NULL) {
1323                 syslog(LOG_ERR, "malloc: %m");
1324                 exit(EX_OSERR);
1325         }
1326         *sep = *cp;
1327         sep->se_fd = -1;
1328         omask = sigblock(SIGBLOCK);
1329         sep->se_next = servtab;
1330         servtab = sep;
1331         sigsetmask(omask);
1332         return (sep);
1333 }
1334
1335 void
1336 enable(struct servtab *sep)
1337 {
1338         if (debug)
1339                 warnx(
1340                     "enabling %s, fd %d", sep->se_service, sep->se_fd);
1341 #ifdef SANITY_CHECK
1342         if (sep->se_fd < 0) {
1343                 syslog(LOG_ERR,
1344                     "%s: %s: bad fd", __func__, sep->se_service);
1345                 exit(EX_SOFTWARE);
1346         }
1347         if (ISMUX(sep)) {
1348                 syslog(LOG_ERR,
1349                     "%s: %s: is mux", __func__, sep->se_service);
1350                 exit(EX_SOFTWARE);
1351         }
1352         if (FD_ISSET(sep->se_fd, &allsock)) {
1353                 syslog(LOG_ERR,
1354                     "%s: %s: not off", __func__, sep->se_service);
1355                 exit(EX_SOFTWARE);
1356         }
1357         nsock++;
1358 #endif
1359         FD_SET(sep->se_fd, &allsock);
1360         if (sep->se_fd > maxsock)
1361                 maxsock = sep->se_fd;
1362 }
1363
1364 void
1365 disable(struct servtab *sep)
1366 {
1367         if (debug)
1368                 warnx(
1369                     "disabling %s, fd %d", sep->se_service, sep->se_fd);
1370 #ifdef SANITY_CHECK
1371         if (sep->se_fd < 0) {
1372                 syslog(LOG_ERR,
1373                     "%s: %s: bad fd", __func__, sep->se_service);
1374                 exit(EX_SOFTWARE);
1375         }
1376         if (ISMUX(sep)) {
1377                 syslog(LOG_ERR,
1378                     "%s: %s: is mux", __func__, sep->se_service);
1379                 exit(EX_SOFTWARE);
1380         }
1381         if (!FD_ISSET(sep->se_fd, &allsock)) {
1382                 syslog(LOG_ERR,
1383                     "%s: %s: not on", __func__, sep->se_service);
1384                 exit(EX_SOFTWARE);
1385         }
1386         if (nsock == 0) {
1387                 syslog(LOG_ERR, "%s: nsock=0", __func__);
1388                 exit(EX_SOFTWARE);
1389         }
1390         nsock--;
1391 #endif
1392         FD_CLR(sep->se_fd, &allsock);
1393         if (sep->se_fd == maxsock)
1394                 maxsock--;
1395 }
1396
1397 FILE    *fconfig = NULL;
1398 struct  servtab serv;
1399 char    line[LINE_MAX];
1400
1401 int
1402 setconfig(void)
1403 {
1404
1405         if (fconfig != NULL) {
1406                 fseek(fconfig, 0L, SEEK_SET);
1407                 return (1);
1408         }
1409         fconfig = fopen(CONFIG, "r");
1410         return (fconfig != NULL);
1411 }
1412
1413 void
1414 endconfig(void)
1415 {
1416         if (fconfig) {
1417                 fclose(fconfig);
1418                 fconfig = NULL;
1419         }
1420 }
1421
1422 struct servtab *
1423 getconfigent(void)
1424 {
1425         struct servtab *sep = &serv;
1426         int argc;
1427         char *cp, *arg, *s;
1428         char *versp;
1429         static char TCPMUX_TOKEN[] = "tcpmux/";
1430 #define MUX_LEN         (sizeof(TCPMUX_TOKEN)-1)
1431         int v4bind = 0;
1432 #ifdef INET6
1433         int v6bind = 0;
1434 #endif
1435         int i;
1436
1437 more:
1438         while ((cp = nextline(fconfig)) != NULL) {
1439                 if (*cp == '#' || *cp == '\0')
1440                         continue;
1441                 break;
1442         }
1443         if (cp == NULL)
1444                 return (NULL);
1445         /*
1446          * clear the static buffer, since some fields (se_ctrladdr,
1447          * for example) don't get initialized here.
1448          */
1449         memset(sep, 0, sizeof *sep);
1450         arg = skip(&cp);
1451         if (cp == NULL) {
1452                 /* got an empty line containing just blanks/tabs. */
1453                 goto more;
1454         }
1455         if (arg[0] == ':') { /* :user:group:perm: */
1456                 char *user, *group, *perm;
1457                 struct passwd *pw;
1458                 struct group *gr;
1459                 user = arg+1;
1460                 if ((group = strchr(user, ':')) == NULL) {
1461                         syslog(LOG_ERR, "no group after user '%s'", user);
1462                         goto more;
1463                 }
1464                 *group++ = '\0';
1465                 if ((perm = strchr(group, ':')) == NULL) {
1466                         syslog(LOG_ERR, "no mode after group '%s'", group);
1467                         goto more;
1468                 }
1469                 *perm++ = '\0';
1470                 if ((pw = getpwnam(user)) == NULL) {
1471                         syslog(LOG_ERR, "no such user '%s'", user);
1472                         goto more;
1473                 }
1474                 sep->se_sockuid = pw->pw_uid;
1475                 if ((gr = getgrnam(group)) == NULL) {
1476                         syslog(LOG_ERR, "no such user '%s'", group);
1477                         goto more;
1478                 }
1479                 sep->se_sockgid = gr->gr_gid;
1480                 sep->se_sockmode = strtol(perm, &arg, 8);
1481                 if (*arg != ':') {
1482                         syslog(LOG_ERR, "bad mode '%s'", perm);
1483                         goto more;
1484                 }
1485                 *arg++ = '\0';
1486         } else {
1487                 sep->se_sockuid = euid;
1488                 sep->se_sockgid = egid;
1489                 sep->se_sockmode = 0200;
1490         }
1491         if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1492                 char *c = arg + MUX_LEN;
1493                 if (*c == '+') {
1494                         sep->se_type = MUXPLUS_TYPE;
1495                         c++;
1496                 } else
1497                         sep->se_type = MUX_TYPE;
1498                 sep->se_service = newstr(c);
1499         } else {
1500                 sep->se_service = newstr(arg);
1501                 sep->se_type = NORM_TYPE;
1502         }
1503         arg = sskip(&cp);
1504         if (strcmp(arg, "stream") == 0)
1505                 sep->se_socktype = SOCK_STREAM;
1506         else if (strcmp(arg, "dgram") == 0)
1507                 sep->se_socktype = SOCK_DGRAM;
1508         else if (strcmp(arg, "rdm") == 0)
1509                 sep->se_socktype = SOCK_RDM;
1510         else if (strcmp(arg, "seqpacket") == 0)
1511                 sep->se_socktype = SOCK_SEQPACKET;
1512         else if (strcmp(arg, "raw") == 0)
1513                 sep->se_socktype = SOCK_RAW;
1514         else
1515                 sep->se_socktype = -1;
1516
1517         arg = sskip(&cp);
1518         if (strncmp(arg, "tcp", 3) == 0) {
1519                 sep->se_proto = newstr(strsep(&arg, "/"));
1520                 if (arg != NULL) {
1521                         if (strcmp(arg, "ttcp") == 0)
1522                                 sep->se_type = TTCP_TYPE;
1523                 }
1524         } else {
1525                 sep->se_proto = newstr(arg);
1526         }
1527         if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1528                 if (no_v4bind != 0) {
1529                         syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1530                                sep->se_service);
1531                         freeconfig(sep);
1532                         goto more;
1533                 }
1534                 memmove(sep->se_proto, sep->se_proto + 4,
1535                     strlen(sep->se_proto) + 1 - 4);
1536                 sep->se_rpc = 1;
1537                 sep->se_rpc_prog = sep->se_rpc_lowvers =
1538                         sep->se_rpc_highvers = 0;
1539                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1540                        sizeof(sep->se_ctrladdr4));
1541                 if ((versp = strrchr(sep->se_service, '/'))) {
1542                         *versp++ = '\0';
1543                         switch (sscanf(versp, "%u-%u",
1544                                        &sep->se_rpc_lowvers,
1545                                        &sep->se_rpc_highvers)) {
1546                         case 2:
1547                                 break;
1548                         case 1:
1549                                 sep->se_rpc_highvers =
1550                                         sep->se_rpc_lowvers;
1551                                 break;
1552                         default:
1553                                 syslog(LOG_ERR,
1554                                         "bad RPC version specifier; %s",
1555                                         sep->se_service);
1556                                 freeconfig(sep);
1557                                 goto more;
1558                         }
1559                 }
1560                 else {
1561                         sep->se_rpc_lowvers =
1562                                 sep->se_rpc_highvers = 1;
1563                 }
1564         }
1565         sep->se_nomapped = 0;
1566         while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1567 #ifdef INET6
1568                 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1569                         if (no_v6bind != 0) {
1570                                 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s",
1571                                        sep->se_service);
1572                                 freeconfig(sep);
1573                                 goto more;
1574                         }
1575                         sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1576                         v6bind = 1;
1577                         continue;
1578                 }
1579 #endif
1580                 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1581                         sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1582                         v4bind = 1;
1583                         continue;
1584                 }
1585                 /* illegal version num */
1586                 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1587                 freeconfig(sep);
1588                 goto more;
1589         }
1590         if (strcmp(sep->se_proto, "unix") == 0) {
1591                 sep->se_family = AF_UNIX;
1592         } else
1593 #ifdef INET6
1594         if (v6bind != 0) {
1595                 sep->se_family = AF_INET6;
1596                 if (v4bind == 0 || no_v4bind != 0)
1597                         sep->se_nomapped = 1;
1598         } else
1599 #endif
1600         { /* default to v4 bind if not v6 bind */
1601                 if (no_v4bind != 0) {
1602                         syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1603                                sep->se_service);
1604                         freeconfig(sep);
1605                         goto more;
1606                 }
1607                 sep->se_family = AF_INET;
1608         }
1609         /* init ctladdr */
1610         switch(sep->se_family) {
1611         case AF_INET:
1612                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1613                        sizeof(sep->se_ctrladdr4));
1614                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1615                 break;
1616 #ifdef INET6
1617         case AF_INET6:
1618                 memcpy(&sep->se_ctrladdr6, bind_sa6,
1619                        sizeof(sep->se_ctrladdr6));
1620                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1621                 break;
1622 #endif
1623         case AF_UNIX:
1624                 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1625                         syslog(LOG_ERR,
1626                             "domain socket pathname too long for service %s",
1627                             sep->se_service);
1628                         goto more;
1629                 }
1630                 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1631                 sep->se_ctrladdr_un.sun_family = sep->se_family;
1632                 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1633                 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1634                 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1635         }
1636         arg = sskip(&cp);
1637         if (!strncmp(arg, "wait", 4))
1638                 sep->se_accept = 0;
1639         else if (!strncmp(arg, "nowait", 6))
1640                 sep->se_accept = 1;
1641         else {
1642                 syslog(LOG_ERR,
1643                         "%s: bad wait/nowait for service %s",
1644                         CONFIG, sep->se_service);
1645                 goto more;
1646         }
1647         sep->se_maxchild = -1;
1648         sep->se_maxcpm = -1;
1649         sep->se_maxperip = -1;
1650         if ((s = strchr(arg, '/')) != NULL) {
1651                 char *eptr;
1652                 u_long val;
1653
1654                 val = strtoul(s + 1, &eptr, 10);
1655                 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1656                         syslog(LOG_ERR,
1657                                 "%s: bad max-child for service %s",
1658                                 CONFIG, sep->se_service);
1659                         goto more;
1660                 }
1661                 if (debug)
1662                         if (!sep->se_accept && val != 1)
1663                                 warnx("maxchild=%lu for wait service %s"
1664                                     " not recommended", val, sep->se_service);
1665                 sep->se_maxchild = val;
1666                 if (*eptr == '/')
1667                         sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1668                 if (*eptr == '/')
1669                         sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1670                 /*
1671                  * explicitly do not check for \0 for future expansion /
1672                  * backwards compatibility
1673                  */
1674         }
1675         if (ISMUX(sep)) {
1676                 /*
1677                  * Silently enforce "nowait" mode for TCPMUX services
1678                  * since they don't have an assigned port to listen on.
1679                  */
1680                 sep->se_accept = 1;
1681                 if (strcmp(sep->se_proto, "tcp")) {
1682                         syslog(LOG_ERR,
1683                                 "%s: bad protocol for tcpmux service %s",
1684                                 CONFIG, sep->se_service);
1685                         goto more;
1686                 }
1687                 if (sep->se_socktype != SOCK_STREAM) {
1688                         syslog(LOG_ERR,
1689                                 "%s: bad socket type for tcpmux service %s",
1690                                 CONFIG, sep->se_service);
1691                         goto more;
1692                 }
1693         }
1694         sep->se_user = newstr(sskip(&cp));
1695 #ifdef LOGIN_CAP
1696         if ((s = strrchr(sep->se_user, '/')) != NULL) {
1697                 *s = '\0';
1698                 sep->se_class = newstr(s + 1);
1699         } else
1700                 sep->se_class = newstr(RESOURCE_RC);
1701 #endif
1702         if ((s = strrchr(sep->se_user, ':')) != NULL) {
1703                 *s = '\0';
1704                 sep->se_group = newstr(s + 1);
1705         } else
1706                 sep->se_group = NULL;
1707         sep->se_server = newstr(sskip(&cp));
1708         if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1709                 sep->se_server_name++;
1710         if (strcmp(sep->se_server, "internal") == 0) {
1711                 struct biltin *bi;
1712
1713                 for (bi = biltins; bi->bi_service; bi++)
1714                         if (bi->bi_socktype == sep->se_socktype &&
1715                             matchservent(bi->bi_service, sep->se_service,
1716                             sep->se_proto))
1717                                 break;
1718                 if (bi->bi_service == 0) {
1719                         syslog(LOG_ERR, "internal service %s unknown",
1720                                 sep->se_service);
1721                         goto more;
1722                 }
1723                 sep->se_accept = 1;     /* force accept mode for built-ins */
1724                 sep->se_bi = bi;
1725         } else
1726                 sep->se_bi = NULL;
1727         if (sep->se_maxperip < 0)
1728                 sep->se_maxperip = maxperip;
1729         if (sep->se_maxcpm < 0)
1730                 sep->se_maxcpm = maxcpm;
1731         if (sep->se_maxchild < 0) {     /* apply default max-children */
1732                 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1733                         sep->se_maxchild = sep->se_bi->bi_maxchild;
1734                 else if (sep->se_accept)
1735                         sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1736                 else
1737                         sep->se_maxchild = 1;
1738         }
1739         if (sep->se_maxchild > 0) {
1740                 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1741                 if (sep->se_pids == NULL) {
1742                         syslog(LOG_ERR, "malloc: %m");
1743                         exit(EX_OSERR);
1744                 }
1745         }
1746         argc = 0;
1747         for (arg = skip(&cp); cp; arg = skip(&cp))
1748                 if (argc < MAXARGV) {
1749                         sep->se_argv[argc++] = newstr(arg);
1750                 } else {
1751                         syslog(LOG_ERR,
1752                                 "%s: too many arguments for service %s",
1753                                 CONFIG, sep->se_service);
1754                         goto more;
1755                 }
1756         while (argc <= MAXARGV)
1757                 sep->se_argv[argc++] = NULL;
1758         for (i = 0; i < PERIPSIZE; ++i)
1759                 LIST_INIT(&sep->se_conn[i]);
1760         return (sep);
1761 }
1762
1763 void
1764 freeconfig(struct servtab *cp)
1765 {
1766         int i;
1767
1768         if (cp->se_service)
1769                 free(cp->se_service);
1770         if (cp->se_proto)
1771                 free(cp->se_proto);
1772         if (cp->se_user)
1773                 free(cp->se_user);
1774         if (cp->se_group)
1775                 free(cp->se_group);
1776 #ifdef LOGIN_CAP
1777         if (cp->se_class)
1778                 free(cp->se_class);
1779 #endif
1780         if (cp->se_server)
1781                 free(cp->se_server);
1782         if (cp->se_pids)
1783                 free(cp->se_pids);
1784         for (i = 0; i < MAXARGV; i++)
1785                 if (cp->se_argv[i])
1786                         free(cp->se_argv[i]);
1787         free_connlist(cp);
1788 }
1789
1790
1791 /*
1792  * Safe skip - if skip returns null, log a syntax error in the
1793  * configuration file and exit.
1794  */
1795 char *
1796 sskip(char **cpp)
1797 {
1798         char *cp;
1799
1800         cp = skip(cpp);
1801         if (cp == NULL) {
1802                 syslog(LOG_ERR, "%s: syntax error", CONFIG);
1803                 exit(EX_DATAERR);
1804         }
1805         return (cp);
1806 }
1807
1808 char *
1809 skip(char **cpp)
1810 {
1811         char *cp = *cpp;
1812         char *start;
1813         char quote = '\0';
1814
1815 again:
1816         while (*cp == ' ' || *cp == '\t')
1817                 cp++;
1818         if (*cp == '\0') {
1819                 int c;
1820
1821                 c = getc(fconfig);
1822                 ungetc(c, fconfig);
1823                 if (c == ' ' || c == '\t')
1824                         if ((cp = nextline(fconfig)))
1825                                 goto again;
1826                 *cpp = NULL;
1827                 return (NULL);
1828         }
1829         if (*cp == '"' || *cp == '\'')
1830                 quote = *cp++;
1831         start = cp;
1832         if (quote)
1833                 while (*cp && *cp != quote)
1834                         cp++;
1835         else
1836                 while (*cp && *cp != ' ' && *cp != '\t')
1837                         cp++;
1838         if (*cp != '\0')
1839                 *cp++ = '\0';
1840         *cpp = cp;
1841         return (start);
1842 }
1843
1844 char *
1845 nextline(FILE *fd)
1846 {
1847         char *cp;
1848
1849         if (fgets(line, sizeof (line), fd) == NULL)
1850                 return (NULL);
1851         cp = strchr(line, '\n');
1852         if (cp)
1853                 *cp = '\0';
1854         return (line);
1855 }
1856
1857 char *
1858 newstr(const char *cp)
1859 {
1860         char *cr;
1861
1862         if ((cr = strdup(cp != NULL ? cp : "")))
1863                 return (cr);
1864         syslog(LOG_ERR, "strdup: %m");
1865         exit(EX_OSERR);
1866 }
1867
1868 void
1869 inetd_setproctitle(const char *a, int s)
1870 {
1871         socklen_t size;
1872         struct sockaddr_storage ss;
1873         char buf[80], pbuf[INET6_ADDRSTRLEN];
1874
1875         size = sizeof(ss);
1876         if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
1877                 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
1878                             NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID);
1879                 sprintf(buf, "%s [%s]", a, pbuf);
1880         } else
1881                 sprintf(buf, "%s", a);
1882         setproctitle("%s", buf);
1883 }
1884
1885 int
1886 check_loop(const struct sockaddr *sa, const struct servtab *sep)
1887 {
1888         struct servtab *se2;
1889         char pname[INET6_ADDRSTRLEN];
1890
1891         for (se2 = servtab; se2; se2 = se2->se_next) {
1892                 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
1893                         continue;
1894
1895                 switch (se2->se_family) {
1896                 case AF_INET:
1897                         if (((const struct sockaddr_in *)sa)->sin_port ==
1898                             se2->se_ctrladdr4.sin_port)
1899                                 goto isloop;
1900                         continue;
1901 #ifdef INET6
1902                 case AF_INET6:
1903                         if (((const struct sockaddr_in *)sa)->sin_port ==
1904                             se2->se_ctrladdr4.sin_port)
1905                                 goto isloop;
1906                         continue;
1907 #endif
1908                 default:
1909                         continue;
1910                 }
1911         isloop:
1912                 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
1913                             NI_NUMERICHOST|NI_WITHSCOPEID);
1914                 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
1915                        sep->se_service, sep->se_proto,
1916                        se2->se_service, se2->se_proto,
1917                        pname);
1918                 return 1;
1919         }
1920         return 0;
1921 }
1922
1923 /*
1924  * print_service:
1925  *      Dump relevant information to stderr
1926  */
1927 void
1928 print_service(const char *action, const struct servtab *sep)
1929 {
1930         fprintf(stderr,
1931             "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
1932 #ifdef LOGIN_CAP
1933             "class=%s"
1934 #endif
1935             " builtin=%p server=%s"
1936             "\n",
1937             action, sep->se_service, sep->se_proto,
1938             sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
1939 #ifdef LOGIN_CAP
1940             sep->se_class,
1941 #endif
1942             (void *) sep->se_bi, sep->se_server
1943             );
1944 }
1945
1946 #define CPMHSIZE        256
1947 #define CPMHMASK        (CPMHSIZE-1)
1948 #define CHTGRAN         10
1949 #define CHTSIZE         6
1950
1951 typedef struct CTime {
1952         unsigned long   ct_Ticks;
1953         int             ct_Count;
1954 } CTime;
1955
1956 typedef struct CHash {
1957         union {
1958                 struct in_addr  c4_Addr;
1959                 struct in6_addr c6_Addr;
1960         } cu_Addr;
1961 #define ch_Addr4        cu_Addr.c4_Addr
1962 #define ch_Addr6        cu_Addr.c6_Addr
1963         int             ch_Family;
1964         time_t          ch_LTime;
1965         char            *ch_Service;
1966         CTime           ch_Times[CHTSIZE];
1967 } CHash;
1968
1969 CHash   CHashAry[CPMHSIZE];
1970
1971 int
1972 cpmip(const struct servtab *sep, int ctrl)
1973 {
1974         struct sockaddr_storage rss;
1975         socklen_t rssLen = sizeof(rss);
1976         int r = 0;
1977
1978         /*
1979          * If getpeername() fails, just let it through (if logging is
1980          * enabled the condition is caught elsewhere)
1981          */
1982
1983         if (sep->se_maxcpm > 0 &&
1984             getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
1985                 time_t t = time(NULL);
1986                 int hv = 0xABC3D20F;
1987                 int i;
1988                 int cnt = 0;
1989                 CHash *chBest = NULL;
1990                 unsigned int ticks = t / CHTGRAN;
1991                 struct sockaddr_in *sin4;
1992 #ifdef INET6
1993                 struct sockaddr_in6 *sin6;
1994 #endif
1995
1996                 sin4 = (struct sockaddr_in *)&rss;
1997 #ifdef INET6
1998                 sin6 = (struct sockaddr_in6 *)&rss;
1999 #endif
2000                 {
2001                         char *p;
2002                         int addrlen;
2003
2004                         switch (rss.ss_family) {
2005                         case AF_INET:
2006                                 p = (char *)&sin4->sin_addr;
2007                                 addrlen = sizeof(struct in_addr);
2008                                 break;
2009 #ifdef INET6
2010                         case AF_INET6:
2011                                 p = (char *)&sin6->sin6_addr;
2012                                 addrlen = sizeof(struct in6_addr);
2013                                 break;
2014 #endif
2015                         default:
2016                                 /* should not happen */
2017                                 return -1;
2018                         }
2019
2020                         for (i = 0; i < addrlen; ++i, ++p) {
2021                                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2022                         }
2023                         hv = (hv ^ (hv >> 16));
2024                 }
2025                 for (i = 0; i < 5; ++i) {
2026                         CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2027
2028                         if (rss.ss_family == AF_INET &&
2029                             ch->ch_Family == AF_INET &&
2030                             sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2031                             ch->ch_Service && strcmp(sep->se_service,
2032                             ch->ch_Service) == 0) {
2033                                 chBest = ch;
2034                                 break;
2035                         }
2036 #ifdef INET6
2037                         if (rss.ss_family == AF_INET6 &&
2038                             ch->ch_Family == AF_INET6 &&
2039                             IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2040                                                &ch->ch_Addr6) != 0 &&
2041                             ch->ch_Service && strcmp(sep->se_service,
2042                             ch->ch_Service) == 0) {
2043                                 chBest = ch;
2044                                 break;
2045                         }
2046 #endif
2047                         if (chBest == NULL || ch->ch_LTime == 0 ||
2048                             ch->ch_LTime < chBest->ch_LTime) {
2049                                 chBest = ch;
2050                         }
2051                 }
2052                 if ((rss.ss_family == AF_INET &&
2053                      (chBest->ch_Family != AF_INET ||
2054                       sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2055                     chBest->ch_Service == NULL ||
2056                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2057                         chBest->ch_Family = sin4->sin_family;
2058                         chBest->ch_Addr4 = sin4->sin_addr;
2059                         if (chBest->ch_Service)
2060                                 free(chBest->ch_Service);
2061                         chBest->ch_Service = strdup(sep->se_service);
2062                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2063                 }
2064 #ifdef INET6
2065                 if ((rss.ss_family == AF_INET6 &&
2066                      (chBest->ch_Family != AF_INET6 ||
2067                       IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2068                                          &chBest->ch_Addr6) == 0)) ||
2069                     chBest->ch_Service == NULL ||
2070                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2071                         chBest->ch_Family = sin6->sin6_family;
2072                         chBest->ch_Addr6 = sin6->sin6_addr;
2073                         if (chBest->ch_Service)
2074                                 free(chBest->ch_Service);
2075                         chBest->ch_Service = strdup(sep->se_service);
2076                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2077                 }
2078 #endif
2079                 chBest->ch_LTime = t;
2080                 {
2081                         CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2082                         if (ct->ct_Ticks != ticks) {
2083                                 ct->ct_Ticks = ticks;
2084                                 ct->ct_Count = 0;
2085                         }
2086                         ++ct->ct_Count;
2087                 }
2088                 for (i = 0; i < CHTSIZE; ++i) {
2089                         CTime *ct = &chBest->ch_Times[i];
2090                         if (ct->ct_Ticks <= ticks &&
2091                             ct->ct_Ticks >= ticks - CHTSIZE) {
2092                                 cnt += ct->ct_Count;
2093                         }
2094                 }
2095                 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) {
2096                         char pname[INET6_ADDRSTRLEN];
2097
2098                         getnameinfo((struct sockaddr *)&rss,
2099                                     ((struct sockaddr *)&rss)->sa_len,
2100                                     pname, sizeof(pname), NULL, 0,
2101                                     NI_NUMERICHOST|NI_WITHSCOPEID);
2102                         r = -1;
2103                         syslog(LOG_ERR,
2104                             "%s from %s exceeded counts/min (limit %d/min)",
2105                             sep->se_service, pname,
2106                             sep->se_maxcpm);
2107                 }
2108         }
2109         return(r);
2110 }
2111
2112 static struct conninfo *
2113 search_conn(struct servtab *sep, int ctrl)
2114 {
2115         struct sockaddr_storage ss;
2116         socklen_t sslen = sizeof(ss);
2117         struct conninfo *conn;
2118         int hv;
2119         char pname[NI_MAXHOST],  pname2[NI_MAXHOST];
2120
2121         if (sep->se_maxperip <= 0)
2122                 return NULL;
2123
2124         /*
2125          * If getpeername() fails, just let it through (if logging is
2126          * enabled the condition is caught elsewhere)
2127          */
2128         if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2129                 return NULL;
2130
2131         switch (ss.ss_family) {
2132         case AF_INET:
2133                 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2134                     sizeof(struct in_addr));
2135                 break;
2136 #ifdef INET6
2137         case AF_INET6:
2138                 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2139                     sizeof(struct in6_addr));
2140                 break;
2141 #endif
2142         default:
2143                 /*
2144                  * Since we only support AF_INET and AF_INET6, just
2145                  * let other than AF_INET and AF_INET6 through.
2146                  */
2147                 return NULL;
2148         }
2149
2150         if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2151             NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
2152                 return NULL;
2153
2154         LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2155                 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2156                     conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2157                     NI_NUMERICHOST | NI_WITHSCOPEID) == 0 &&
2158                     strcmp(pname, pname2) == 0)
2159                         break;
2160         }
2161
2162         if (conn == NULL) {
2163                 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2164                         syslog(LOG_ERR, "malloc: %m");
2165                         exit(EX_OSERR);
2166                 }
2167                 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2168                 if (conn->co_proc == NULL) {
2169                         syslog(LOG_ERR, "malloc: %m");
2170                         exit(EX_OSERR);
2171                 }
2172                 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2173                 conn->co_numchild = 0;
2174                 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2175         }
2176
2177         /*
2178          * Since a child process is not invoked yet, we cannot
2179          * determine a pid of a child.  So, co_proc and co_numchild
2180          * should be filled leter.
2181          */
2182
2183         return conn;
2184 }
2185
2186 static int
2187 room_conn(struct servtab *sep, struct conninfo *conn)
2188 {
2189         char pname[NI_MAXHOST];
2190
2191         if (conn->co_numchild >= sep->se_maxperip) {
2192                 getnameinfo((struct sockaddr *)&conn->co_addr,
2193                     conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2194                     NI_NUMERICHOST | NI_WITHSCOPEID);
2195                 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2196                     sep->se_service, pname, sep->se_maxperip);
2197                 return 0;
2198         }
2199         return 1;
2200 }
2201
2202 static void
2203 addchild_conn(struct conninfo *conn, pid_t pid)
2204 {
2205         struct procinfo *proc;
2206
2207         if (conn == NULL)
2208                 return;
2209
2210         if ((proc = search_proc(pid, 1)) != NULL) {
2211                 if (proc->pr_conn != NULL) {
2212                         syslog(LOG_ERR,
2213                             "addchild_conn: child already on process list");
2214                         exit(EX_OSERR);
2215                 }
2216                 proc->pr_conn = conn;
2217         }
2218
2219         conn->co_proc[conn->co_numchild++] = proc;
2220 }
2221
2222 static void
2223 reapchild_conn(pid_t pid)
2224 {
2225         struct procinfo *proc;
2226         struct conninfo *conn;
2227         int i;
2228
2229         if ((proc = search_proc(pid, 0)) == NULL)
2230                 return;
2231         if ((conn = proc->pr_conn) == NULL)
2232                 return;
2233         for (i = 0; i < conn->co_numchild; ++i)
2234                 if (conn->co_proc[i] == proc) {
2235                         conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2236                         break;
2237                 }
2238         free_proc(proc);
2239         free_conn(conn);
2240 }
2241
2242 static void
2243 resize_conn(struct servtab *sep, int maxpip)
2244 {
2245         struct conninfo *conn;
2246         int i, j;
2247
2248         if (sep->se_maxperip <= 0)
2249                 return;
2250         if (maxpip <= 0) {
2251                 free_connlist(sep);
2252                 return;
2253         }
2254         for (i = 0; i < PERIPSIZE; ++i) {
2255                 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2256                         for (j = maxpip; j < conn->co_numchild; ++j)
2257                                 free_proc(conn->co_proc[j]);
2258                         conn->co_proc = realloc(conn->co_proc,
2259                             maxpip * sizeof(*conn->co_proc));
2260                         if (conn->co_proc == NULL) {
2261                                 syslog(LOG_ERR, "realloc: %m");
2262                                 exit(EX_OSERR);
2263                         }
2264                         if (conn->co_numchild > maxpip)
2265                                 conn->co_numchild = maxpip;
2266                 }
2267         }
2268 }
2269
2270 static void
2271 free_connlist(struct servtab *sep)
2272 {
2273         struct conninfo *conn;
2274         int i, j;
2275
2276         for (i = 0; i < PERIPSIZE; ++i) {
2277                 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2278                         for (j = 0; j < conn->co_numchild; ++j)
2279                                 free_proc(conn->co_proc[j]);
2280                         conn->co_numchild = 0;
2281                         free_conn(conn);
2282                 }
2283         }
2284 }
2285
2286 static void
2287 free_conn(struct conninfo *conn)
2288 {
2289         if (conn == NULL)
2290                 return;
2291         if (conn->co_numchild <= 0) {
2292                 LIST_REMOVE(conn, co_link);
2293                 free(conn->co_proc);
2294                 free(conn);
2295         }
2296 }
2297
2298 static struct procinfo *
2299 search_proc(pid_t pid, int add)
2300 {
2301         struct procinfo *proc;
2302         int hv;
2303
2304         hv = hashval((char *)&pid, sizeof(pid));
2305         LIST_FOREACH(proc, &proctable[hv], pr_link) {
2306                 if (proc->pr_pid == pid)
2307                         break;
2308         }
2309         if (proc == NULL && add) {
2310                 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2311                         syslog(LOG_ERR, "malloc: %m");
2312                         exit(EX_OSERR);
2313                 }
2314                 proc->pr_pid = pid;
2315                 proc->pr_conn = NULL;
2316                 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2317         }
2318         return proc;
2319 }
2320
2321 static void
2322 free_proc(struct procinfo *proc)
2323 {
2324         if (proc == NULL)
2325                 return;
2326         LIST_REMOVE(proc, pr_link);
2327         free(proc);
2328 }
2329
2330 static int
2331 hashval(char *p, int len)
2332 {
2333         int i, hv = 0xABC3D20F;
2334
2335         for (i = 0; i < len; ++i, ++p)
2336                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2337         hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2338         return hv;
2339 }