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  * 4. 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
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)from: inetd.c       8.4 (Berkeley) 4/13/94";
  39 #endif
  40 #endif /* not lint */
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 /*
  46  * Inetd - Internet super-server
  47  *
  48  * This program invokes all internet services as needed.  Connection-oriented
  49  * services are invoked each time a connection is made, by creating a process.
  50  * This process is passed the connection as file descriptor 0 and is expected
  51  * to do a getpeername to find out the source host and port.
  52  *
  53  * Datagram oriented services are invoked when a datagram
  54  * arrives; a process is created and passed a pending message
  55  * on file descriptor 0.  Datagram servers may either connect
  56  * to their peer, freeing up the original socket for inetd
  57  * to receive further messages on, or ``take over the socket'',
  58  * processing all arriving datagrams and, eventually, timing
  59  * out.  The first type of server is said to be ``multi-threaded'';
  60  * the second type of server ``single-threaded''.
  61  *
  62  * Inetd uses a configuration file which is read at startup
  63  * and, possibly, at some later time in response to a hangup signal.
  64  * The configuration file is ``free format'' with fields given in the
  65  * order shown below.  Continuation lines for an entry must begin with
  66  * a space or tab.  All fields must be present in each entry.
  67  *
  68  *      service name                    must be in /etc/services
  69  *                                      or name a tcpmux service
  70  *                                      or specify a unix domain socket
  71  *      socket type                     stream/dgram/raw/rdm/seqpacket
  72  *      protocol                        tcp[4][6][/faith], udp[4][6], unix
  73  *      wait/nowait                     single-threaded/multi-threaded
  74  *      user[:group][/login-class]      user/group/login-class to run daemon as
  75  *      server program                  full path name
  76  *      server program arguments        maximum of MAXARGS (20)
  77  *
  78  * TCP services without official port numbers are handled with the
  79  * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
  80  * requests. When a connection is made from a foreign host, the service
  81  * requested is passed to tcpmux, which looks it up in the servtab list
  82  * and returns the proper entry for the service. Tcpmux returns a
  83  * negative reply if the service doesn't exist, otherwise the invoked
  84  * server is expected to return the positive reply if the service type in
  85  * inetd.conf file has the prefix "tcpmux/". If the service type has the
  86  * prefix "tcpmux/+", tcpmux will return the positive reply for the
  87  * process; this is for compatibility with older server code, and also
  88  * allows you to invoke programs that use stdin/stdout without putting any
  89  * special server code in them. Services that use tcpmux are "nowait"
  90  * because they do not have a well-known port and hence cannot listen
  91  * for new requests.
  92  *
  93  * For RPC services
  94  *      service name/version            must be in /etc/rpc
  95  *      socket type                     stream/dgram/raw/rdm/seqpacket
  96  *      protocol                        rpc/tcp[4][6], rpc/udp[4][6]
  97  *      wait/nowait                     single-threaded/multi-threaded
  98  *      user[:group][/login-class]      user/group/login-class to run daemon as
  99  *      server program                  full path name
 100  *      server program arguments        maximum of MAXARGS
 101  *
 102  * Comment lines are indicated by a `#' in column 1.
 103  *
 104  * #ifdef IPSEC
 105  * Comment lines that start with "#@" denote IPsec policy string, as described
 106  * in ipsec_set_policy(3).  This will affect all the following items in
 107  * inetd.conf(8).  To reset the policy, just use "#@" line.  By default,
 108  * there's no IPsec policy.
 109  * #endif
 110  */
 111 #include <sys/param.h>
 112 #include <sys/ioctl.h>
 113 #include <sys/mman.h>
 114 #include <sys/wait.h>
 115 #include <sys/time.h>
 116 #include <sys/resource.h>
 117 #include <sys/stat.h>
 118 #include <sys/un.h>
 119
 120 #include <netinet/in.h>
 121 #include <netinet/tcp.h>
 122 #include <arpa/inet.h>
 123 #include <rpc/rpc.h>
 124 #include <rpc/pmap_clnt.h>
 125
 126 #include <ctype.h>
 127 #include <errno.h>
 128 #include <err.h>
 129 #include <fcntl.h>
 130 #include <grp.h>
 131 #include <libutil.h>
 132 #include <limits.h>
 133 #include <netdb.h>
 134 #include <pwd.h>
 135 #include <signal.h>
 136 #include <stdio.h>
 137 #include <stdlib.h>
 138 #include <string.h>
 139 #include <sysexits.h>
 140 #include <syslog.h>
 141 #include <tcpd.h>
 142 #include <unistd.h>
 143
 144 #include "inetd.h"
 145 #include "pathnames.h"
 146
 147 #ifdef IPSEC
 148 #include <netipsec/ipsec.h>
 149 #ifndef IPSEC_POLICY_IPSEC      /* no ipsec support on old ipsec */
 150 #undef IPSEC
 151 #endif
 152 #endif
 153
 154 #ifndef LIBWRAP_ALLOW_FACILITY
 155 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
 156 #endif
 157 #ifndef LIBWRAP_ALLOW_SEVERITY
 158 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
 159 #endif
 160 #ifndef LIBWRAP_DENY_FACILITY
 161 # define LIBWRAP_DENY_FACILITY LOG_AUTH
 162 #endif
 163 #ifndef LIBWRAP_DENY_SEVERITY
 164 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
 165 #endif
 166
 167 #define ISWRAP(sep)     \
 168            ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
 169         && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
 170         && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
 171             || (sep)->se_socktype == SOCK_DGRAM))
 172
 173 #ifdef LOGIN_CAP
 174 #include <login_cap.h>
 175
 176 /* see init.c */
 177 #define RESOURCE_RC "daemon"
 178
 179 #endif
 180
 181 #ifndef MAXCHILD
 182 #define MAXCHILD        -1              /* maximum number of this service
 183                                            < 0 = no limit */
 184 #endif
 185
 186 #ifndef MAXCPM
 187 #define MAXCPM          -1              /* rate limit invocations from a
 188                                            single remote address,
 189                                            < 0 = no limit */
 190 #endif
 191
 192 #ifndef MAXPERIP
 193 #define MAXPERIP        -1              /* maximum number of this service
 194                                            from a single remote address,
 195                                            < 0 = no limit */
 196 #endif
 197
 198 #ifndef TOOMANY
 199 #define TOOMANY         256             /* don't start more than TOOMANY */
 200 #endif
 201 #define CNT_INTVL       60              /* servers in CNT_INTVL sec. */
 202 #define RETRYTIME       (60*10)         /* retry after bind or server fail */
 203 #define MAX_MAXCHLD     32767           /* max allowable max children */
 204
 205 #define SIGBLOCK        (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
 206
 207 void            close_sep(struct servtab *);
 208 void            flag_signal(int);
 209 void            flag_config(int);
 210 void            config(void);
 211 int             cpmip(const struct servtab *, int);
 212 void            endconfig(void);
 213 struct servtab *enter(struct servtab *);
 214 void            freeconfig(struct servtab *);
 215 struct servtab *getconfigent(void);
 216 int             matchservent(const char *, const char *, const char *);
 217 char           *nextline(FILE *);
 218 void            addchild(struct servtab *, int);
 219 void            flag_reapchild(int);
 220 void            reapchild(void);
 221 void            enable(struct servtab *);
 222 void            disable(struct servtab *);
 223 void            flag_retry(int);
 224 void            retry(void);
 225 int             setconfig(void);
 226 void            setup(struct servtab *);
 227 #ifdef IPSEC
 228 void            ipsecsetup(struct servtab *);
 229 #endif
 230 void            unregisterrpc(register struct servtab *sep);
 231 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
 232 static int      room_conn(struct servtab *sep, struct conninfo *conn);
 233 static void     addchild_conn(struct conninfo *conn, pid_t pid);
 234 static void     reapchild_conn(pid_t pid);
 235 static void     free_conn(struct conninfo *conn);
 236 static void     resize_conn(struct servtab *sep, int maxperip);
 237 static void     free_connlist(struct servtab *sep);
 238 static void     free_proc(struct procinfo *);
 239 static struct procinfo *search_proc(pid_t pid, int add);
 240 static int      hashval(char *p, int len);
 241
 242 int     allow_severity;
 243 int     deny_severity;
 244 int     wrap_ex = 0;
 245 int     wrap_bi = 0;
 246 int     debug = 0;
 247 int     dolog = 0;
 248 int     maxsock;                        /* highest-numbered descriptor */
 249 fd_set  allsock;
 250 int     options;
 251 int     timingout;
 252 int     toomany = TOOMANY;
 253 int     maxchild = MAXCHILD;
 254 int     maxcpm = MAXCPM;
 255 int     maxperip = MAXPERIP;
 256 struct  servent *sp;
 257 struct  rpcent *rpc;
 258 char    *hostname = NULL;
 259 struct  sockaddr_in *bind_sa4;
 260 int     v4bind_ok = 0;
 261 #ifdef INET6
 262 struct  sockaddr_in6 *bind_sa6;
 263 int     v6bind_ok = 0;
 264 #endif
 265 int     signalpipe[2];
 266 #ifdef SANITY_CHECK
 267 int     nsock;
 268 #endif
 269 uid_t   euid;
 270 gid_t   egid;
 271 mode_t  mask;
 272
 273 struct  servtab *servtab;
 274
 275 extern struct biltin biltins[];
 276
 277 const char      *CONFIG = _PATH_INETDCONF;
 278 const char      *pid_file = _PATH_INETDPID;
 279 struct pidfh    *pfh = NULL;
 280
 281 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
 282
 283 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
 284
 285 int
 286 getvalue(const char *arg, int *value, const char *whine)
 287 {
 288         int  tmp;
 289         char *p;
 290
 291         tmp = strtol(arg, &p, 0);
 292         if (tmp < 0 || *p) {
 293                 syslog(LOG_ERR, whine, arg);
 294                 return 1;                       /* failure */
 295         }
 296         *value = tmp;
 297         return 0;                               /* success */
 298 }
 299
 300 static sa_family_t
 301 whichaf(struct request_info *req)
 302 {
 303         struct sockaddr *sa;
 304
 305         sa = (struct sockaddr *)req->client->sin;
 306         if (sa == NULL)
 307                 return AF_UNSPEC;
 308         if (sa->sa_family == AF_INET6 &&
 309             IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr))
 310                 return AF_INET;
 311         return sa->sa_family;
 312 }
 313
 314 int
 315 main(int argc, char **argv)
 316 {
 317         struct servtab *sep;
 318         struct passwd *pwd;
 319         struct group *grp;
 320         struct sigaction sa, saalrm, sachld, sahup, sapipe;
 321         int ch, dofork;
 322         pid_t pid;
 323         char buf[50];
 324 #ifdef LOGIN_CAP
 325         login_cap_t *lc = NULL;
 326 #endif
 327         struct request_info req;
 328         int denied;
 329         char *service = NULL;
 330         struct sockaddr_storage peer;
 331         int i;
 332         struct addrinfo hints, *res;
 333         const char *servname;
 334         int error;
 335         struct conninfo *conn;
 336
 337         openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
 338
 339         while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
 340                 switch(ch) {
 341                 case 'd':
 342                         debug = 1;
 343                         options |= SO_DEBUG;
 344                         break;
 345                 case 'l':
 346                         dolog = 1;
 347                         break;
 348                 case 'R':
 349                         getvalue(optarg, &toomany,
 350                                 "-R %s: bad value for service invocation rate");
 351                         break;
 352                 case 'c':
 353                         getvalue(optarg, &maxchild,
 354                                 "-c %s: bad value for maximum children");
 355                         break;
 356                 case 'C':
 357                         getvalue(optarg, &maxcpm,
 358                                 "-C %s: bad value for maximum children/minute");
 359                         break;
 360                 case 'a':
 361                         hostname = optarg;
 362                         break;
 363                 case 'p':
 364                         pid_file = optarg;
 365                         break;
 366                 case 's':
 367                         getvalue(optarg, &maxperip,
 368                                 "-s %s: bad value for maximum children per source address");
 369                         break;
 370                 case 'w':
 371                         wrap_ex++;
 372                         break;
 373                 case 'W':
 374                         wrap_bi++;
 375                         break;
 376                 case '?':
 377                 default:
 378                         syslog(LOG_ERR,
 379                                 "usage: inetd [-dlwW] [-a address] [-R rate]"
 380                                 " [-c maximum] [-C rate]"
 381                                 " [-p pidfile] [conf-file]");
 382                         exit(EX_USAGE);
 383                 }
 384         /*
 385          * Initialize Bind Addrs.
 386          *   When hostname is NULL, wild card bind addrs are obtained from
 387          *   getaddrinfo(). But getaddrinfo() requires at least one of
 388          *   hostname or servname is non NULL.
 389          *   So when hostname is NULL, set dummy value to servname.
 390          *   Since getaddrinfo() doesn't accept numeric servname, and
 391          *   we doesn't use ai_socktype of struct addrinfo returned
 392          *   from getaddrinfo(), we set dummy value to ai_socktype.
 393          */
 394         servname = (hostname == NULL) ? "0" /* dummy */ : NULL;
 395
 396         bzero(&hints, sizeof(struct addrinfo));
 397         hints.ai_flags = AI_PASSIVE;
 398         hints.ai_family = AF_UNSPEC;
 399         hints.ai_socktype = SOCK_STREAM;        /* dummy */
 400         error = getaddrinfo(hostname, servname, &hints, &res);
 401         if (error != 0) {
 402                 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
 403                 if (error == EAI_SYSTEM)
 404                         syslog(LOG_ERR, "%s", strerror(errno));
 405                 exit(EX_USAGE);
 406         }
 407         do {
 408                 if (res->ai_addr == NULL) {
 409                         syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
 410                         exit(EX_USAGE);
 411                 }
 412                 switch (res->ai_addr->sa_family) {
 413                 case AF_INET:
 414                         if (v4bind_ok)
 415                                 continue;
 416                         bind_sa4 = (struct sockaddr_in *)res->ai_addr;
 417                         /* init port num in case servname is dummy */
 418                         bind_sa4->sin_port = 0;
 419                         v4bind_ok = 1;
 420                         continue;
 421 #ifdef INET6
 422                 case AF_INET6:
 423                         if (v6bind_ok)
 424                                 continue;
 425                         bind_sa6 = (struct sockaddr_in6 *)res->ai_addr;
 426                         /* init port num in case servname is dummy */
 427                         bind_sa6->sin6_port = 0;
 428                         v6bind_ok = 1;
 429                         continue;
 430 #endif
 431                 }
 432                 if (v4bind_ok
 433 #ifdef INET6
 434                     && v6bind_ok
 435 #endif
 436                     )
 437                         break;
 438         } while ((res = res->ai_next) != NULL);
 439         if (!v4bind_ok
 440 #ifdef INET6
 441             && !v6bind_ok
 442 #endif
 443             ) {
 444                 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
 445                 exit(EX_USAGE);
 446         }
 447
 448         euid = geteuid();
 449         egid = getegid();
 450         umask(mask = umask(0777));
 451
 452         argc -= optind;
 453         argv += optind;
 454
 455         if (argc > 0)
 456                 CONFIG = argv[0];
 457         if (access(CONFIG, R_OK) < 0)
 458                 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG);
 459         if (debug == 0) {
 460                 pid_t otherpid;
 461
 462                 pfh = pidfile_open(pid_file, 0600, &otherpid);
 463                 if (pfh == NULL) {
 464                         if (errno == EEXIST) {
 465                                 syslog(LOG_ERR, "%s already running, pid: %d",
 466                                     getprogname(), otherpid);
 467                                 exit(EX_OSERR);
 468                         }
 469                         syslog(LOG_WARNING, "pidfile_open() failed: %m");
 470                 }
 471
 472                 if (daemon(0, 0) < 0) {
 473                         syslog(LOG_WARNING, "daemon(0,0) failed: %m");
 474                 }
 475                 /* From now on we don't want syslog messages going to stderr. */
 476                 closelog();
 477                 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
 478                 /*
 479                  * In case somebody has started inetd manually, we need to
 480                  * clear the logname, so that old servers run as root do not
 481                  * get the user's logname..
 482                  */
 483                 if (setlogin("") < 0) {
 484                         syslog(LOG_WARNING, "cannot clear logname: %m");
 485                         /* no big deal if it fails.. */
 486                 }
 487                 if (pfh != NULL && pidfile_write(pfh) == -1) {
 488                         syslog(LOG_WARNING, "pidfile_write(): %m");
 489                 }
 490         }
 491
 492         if (madvise(NULL, 0, MADV_PROTECT) != 0)
 493                 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno));
 494
 495         for (i = 0; i < PERIPSIZE; ++i)
 496                 LIST_INIT(&proctable[i]);
 497
 498         if (v4bind_ok) {
 499                 udpconf = getnetconfigent("udp");
 500                 tcpconf = getnetconfigent("tcp");
 501                 if (udpconf == NULL || tcpconf == NULL) {
 502                         syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp");
 503                         exit(EX_USAGE);
 504                 }
 505         }
 506 #ifdef INET6
 507         if (v6bind_ok) {
 508                 udp6conf = getnetconfigent("udp6");
 509                 tcp6conf = getnetconfigent("tcp6");
 510                 if (udp6conf == NULL || tcp6conf == NULL) {
 511                         syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6");
 512                         exit(EX_USAGE);
 513                 }
 514         }
 515 #endif
 516
 517         sa.sa_flags = 0;
 518         sigemptyset(&sa.sa_mask);
 519         sigaddset(&sa.sa_mask, SIGALRM);
 520         sigaddset(&sa.sa_mask, SIGCHLD);
 521         sigaddset(&sa.sa_mask, SIGHUP);
 522         sa.sa_handler = flag_retry;
 523         sigaction(SIGALRM, &sa, &saalrm);
 524         config();
 525         sa.sa_handler = flag_config;
 526         sigaction(SIGHUP, &sa, &sahup);
 527         sa.sa_handler = flag_reapchild;
 528         sigaction(SIGCHLD, &sa, &sachld);
 529         sa.sa_handler = SIG_IGN;
 530         sigaction(SIGPIPE, &sa, &sapipe);
 531
 532         {
 533                 /* space for daemons to overwrite environment for ps */
 534 #define DUMMYSIZE       100
 535                 char dummy[DUMMYSIZE];
 536
 537                 (void)memset(dummy, 'x', DUMMYSIZE - 1);
 538                 dummy[DUMMYSIZE - 1] = '\0';
 539                 (void)setenv("inetd_dummy", dummy, 1);
 540         }
 541
 542         if (pipe(signalpipe) != 0) {
 543                 syslog(LOG_ERR, "pipe: %m");
 544                 exit(EX_OSERR);
 545         }
 546         if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 ||
 547             fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) {
 548                 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m");
 549                 exit(EX_OSERR);
 550         }
 551         FD_SET(signalpipe[0], &allsock);
 552 #ifdef SANITY_CHECK
 553         nsock++;
 554 #endif
 555         if (signalpipe[0] > maxsock)
 556             maxsock = signalpipe[0];
 557         if (signalpipe[1] > maxsock)
 558             maxsock = signalpipe[1];
 559
 560         for (;;) {
 561             int n, ctrl;
 562             fd_set readable;
 563
 564 #ifdef SANITY_CHECK
 565             if (nsock == 0) {
 566                 syslog(LOG_ERR, "%s: nsock=0", __func__);
 567                 exit(EX_SOFTWARE);
 568             }
 569 #endif
 570             readable = allsock;
 571             if ((n = select(maxsock + 1, &readable, (fd_set *)0,
 572                 (fd_set *)0, (struct timeval *)0)) <= 0) {
 573                     if (n < 0 && errno != EINTR) {
 574                         syslog(LOG_WARNING, "select: %m");
 575                         sleep(1);
 576                     }
 577                     continue;
 578             }
 579             /* handle any queued signal flags */
 580             if (FD_ISSET(signalpipe[0], &readable)) {
 581                 int nsig;
 582                 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
 583                     syslog(LOG_ERR, "ioctl: %m");
 584                     exit(EX_OSERR);
 585                 }
 586                 while (--nsig >= 0) {
 587                     char c;
 588                     if (read(signalpipe[0], &c, 1) != 1) {
 589                         syslog(LOG_ERR, "read: %m");
 590                         exit(EX_OSERR);
 591                     }
 592                     if (debug)
 593                         warnx("handling signal flag %c", c);
 594                     switch(c) {
 595                     case 'A': /* sigalrm */
 596                         retry();
 597                         break;
 598                     case 'C': /* sigchld */
 599                         reapchild();
 600                         break;
 601                     case 'H': /* sighup */
 602                         config();
 603                         break;
 604                     }
 605                 }
 606             }
 607             for (sep = servtab; n && sep; sep = sep->se_next)
 608                 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
 609                     n--;
 610                     if (debug)
 611                             warnx("someone wants %s", sep->se_service);
 612                     dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
 613                     conn = NULL;
 614                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
 615                             i = 1;
 616                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 617                                     syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
 618                             ctrl = accept(sep->se_fd, (struct sockaddr *)0,
 619                                 (socklen_t *)0);
 620                             if (debug)
 621                                     warnx("accept, ctrl %d", ctrl);
 622                             if (ctrl < 0) {
 623                                     if (errno != EINTR)
 624                                             syslog(LOG_WARNING,
 625                                                 "accept (for %s): %m",
 626                                                 sep->se_service);
 627                                       if (sep->se_accept &&
 628                                           sep->se_socktype == SOCK_STREAM)
 629                                               close(ctrl);
 630                                     continue;
 631                             }
 632                             i = 0;
 633                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 634                                     syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
 635                             if (ioctl(ctrl, FIONBIO, &i) < 0)
 636                                     syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
 637                             if (cpmip(sep, ctrl) < 0) {
 638                                 close(ctrl);
 639                                 continue;
 640                             }
 641                             if (dofork &&
 642                                 (conn = search_conn(sep, ctrl)) != NULL &&
 643                                 !room_conn(sep, conn)) {
 644                                 close(ctrl);
 645                                 continue;
 646                             }
 647                     } else
 648                             ctrl = sep->se_fd;
 649                     if (dolog && !ISWRAP(sep)) {
 650                             char pname[NI_MAXHOST] = "unknown";
 651                             socklen_t sl;
 652                             sl = sizeof(peer);
 653                             if (getpeername(ctrl, (struct sockaddr *)
 654                                             &peer, &sl)) {
 655                                     sl = sizeof(peer);
 656                                     if (recvfrom(ctrl, buf, sizeof(buf),
 657                                         MSG_PEEK,
 658                                         (struct sockaddr *)&peer,
 659                                         &sl) >= 0) {
 660                                       getnameinfo((struct sockaddr *)&peer,
 661                                                   peer.ss_len,
 662                                                   pname, sizeof(pname),
 663                                                   NULL, 0, NI_NUMERICHOST);
 664                                     }
 665                             } else {
 666                                     getnameinfo((struct sockaddr *)&peer,
 667                                                 peer.ss_len,
 668                                                 pname, sizeof(pname),
 669                                                 NULL, 0, NI_NUMERICHOST);
 670                             }
 671                             syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
 672                     }
 673                     (void) sigblock(SIGBLOCK);
 674                     pid = 0;
 675                     /*
 676                      * Fork for all external services, builtins which need to
 677                      * fork and anything we're wrapping (as wrapping might
 678                      * block or use hosts_options(5) twist).
 679                      */
 680                     if (dofork) {
 681                             if (sep->se_count++ == 0)
 682                                 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time);
 683                             else if (toomany > 0 && sep->se_count >= toomany) {
 684                                 struct timespec now;
 685
 686                                 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 687                                 if (now.tv_sec - sep->se_time.tv_sec >
 688                                     CNT_INTVL) {
 689                                         sep->se_time = now;
 690                                         sep->se_count = 1;
 691                                 } else {
 692                                         syslog(LOG_ERR,
 693                         "%s/%s server failing (looping), service terminated",
 694                                             sep->se_service, sep->se_proto);
 695                                         if (sep->se_accept &&
 696                                             sep->se_socktype == SOCK_STREAM)
 697                                                 close(ctrl);
 698                                         close_sep(sep);
 699                                         free_conn(conn);
 700                                         sigsetmask(0L);
 701                                         if (!timingout) {
 702                                                 timingout = 1;
 703                                                 alarm(RETRYTIME);
 704                                         }
 705                                         continue;
 706                                 }
 707                             }
 708                             pid = fork();
 709                     }
 710                     if (pid < 0) {
 711                             syslog(LOG_ERR, "fork: %m");
 712                             if (sep->se_accept &&
 713                                 sep->se_socktype == SOCK_STREAM)
 714                                     close(ctrl);
 715                             free_conn(conn);
 716                             sigsetmask(0L);
 717                             sleep(1);
 718                             continue;
 719                     }
 720                     if (pid) {
 721                         addchild_conn(conn, pid);
 722                         addchild(sep, pid);
 723                     }
 724                     sigsetmask(0L);
 725                     if (pid == 0) {
 726                             pidfile_close(pfh);
 727                             if (dofork) {
 728                                 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
 729                                 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
 730                                 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
 731                                 /* SIGPIPE reset before exec */
 732                             }
 733                             /*
 734                              * Call tcpmux to find the real service to exec.
 735                              */
 736                             if (sep->se_bi &&
 737                                 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
 738                                     sep = tcpmux(ctrl);
 739                                     if (sep == NULL) {
 740                                             close(ctrl);
 741                                             _exit(0);
 742                                     }
 743                             }
 744                             if (ISWRAP(sep)) {
 745                                 inetd_setproctitle("wrapping", ctrl);
 746                                 service = sep->se_server_name ?
 747                                     sep->se_server_name : sep->se_service;
 748                                 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0);
 749                                 fromhost(&req);
 750                                 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
 751                                 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
 752                                 denied = !hosts_access(&req);
 753                                 if (denied) {
 754                                     syslog(deny_severity,
 755                                         "refused connection from %.500s, service %s (%s%s)",
 756                                         eval_client(&req), service, sep->se_proto,
 757                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 758                                     if (sep->se_socktype != SOCK_STREAM)
 759                                         recv(ctrl, buf, sizeof (buf), 0);
 760                                     if (dofork) {
 761                                         sleep(1);
 762                                         _exit(0);
 763                                     }
 764                                 }
 765                                 if (dolog) {
 766                                     syslog(allow_severity,
 767                                         "connection from %.500s, service %s (%s%s)",
 768                                         eval_client(&req), service, sep->se_proto,
 769                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 770                                 }
 771                             }
 772                             if (sep->se_bi) {
 773                                 (*sep->se_bi->bi_fn)(ctrl, sep);
 774                             } else {
 775                                 if (debug)
 776                                         warnx("%d execl %s",
 777                                                 getpid(), sep->se_server);
 778                                 /* Clear close-on-exec. */
 779                                 if (fcntl(ctrl, F_SETFD, 0) < 0) {
 780                                         syslog(LOG_ERR,
 781                                             "%s/%s: fcntl (F_SETFD, 0): %m",
 782                                                 sep->se_service, sep->se_proto);
 783                                         _exit(EX_OSERR);
 784                                 }
 785                                 if (ctrl != 0) {
 786                                         dup2(ctrl, 0);
 787                                         close(ctrl);
 788                                 }
 789                                 dup2(0, 1);
 790                                 dup2(0, 2);
 791                                 if ((pwd = getpwnam(sep->se_user)) == NULL) {
 792                                         syslog(LOG_ERR,
 793                                             "%s/%s: %s: no such user",
 794                                                 sep->se_service, sep->se_proto,
 795                                                 sep->se_user);
 796                                         if (sep->se_socktype != SOCK_STREAM)
 797                                                 recv(0, buf, sizeof (buf), 0);
 798                                         _exit(EX_NOUSER);
 799                                 }
 800                                 grp = NULL;
 801                                 if (   sep->se_group != NULL
 802                                     && (grp = getgrnam(sep->se_group)) == NULL
 803                                    ) {
 804                                         syslog(LOG_ERR,
 805                                             "%s/%s: %s: no such group",
 806                                                 sep->se_service, sep->se_proto,
 807                                                 sep->se_group);
 808                                         if (sep->se_socktype != SOCK_STREAM)
 809                                                 recv(0, buf, sizeof (buf), 0);
 810                                         _exit(EX_NOUSER);
 811                                 }
 812                                 if (grp != NULL)
 813                                         pwd->pw_gid = grp->gr_gid;
 814 #ifdef LOGIN_CAP
 815                                 if ((lc = login_getclass(sep->se_class)) == NULL) {
 816                                         /* error syslogged by getclass */
 817                                         syslog(LOG_ERR,
 818                                             "%s/%s: %s: login class error",
 819                                                 sep->se_service, sep->se_proto,
 820                                                 sep->se_class);
 821                                         if (sep->se_socktype != SOCK_STREAM)
 822                                                 recv(0, buf, sizeof (buf), 0);
 823                                         _exit(EX_NOUSER);
 824                                 }
 825 #endif
 826                                 if (setsid() < 0) {
 827                                         syslog(LOG_ERR,
 828                                                 "%s: can't setsid(): %m",
 829                                                  sep->se_service);
 830                                         /* _exit(EX_OSERR); not fatal yet */
 831                                 }
 832 #ifdef LOGIN_CAP
 833                                 if (setusercontext(lc, pwd, pwd->pw_uid,
 834                                     LOGIN_SETALL & ~LOGIN_SETMAC)
 835                                     != 0) {
 836                                         syslog(LOG_ERR,
 837                                          "%s: can't setusercontext(..%s..): %m",
 838                                          sep->se_service, sep->se_user);
 839                                         _exit(EX_OSERR);
 840                                 }
 841                                 login_close(lc);
 842 #else
 843                                 if (pwd->pw_uid) {
 844                                         if (setlogin(sep->se_user) < 0) {
 845                                                 syslog(LOG_ERR,
 846                                                  "%s: can't setlogin(%s): %m",
 847                                                  sep->se_service, sep->se_user);
 848                                                 /* _exit(EX_OSERR); not yet */
 849                                         }
 850                                         if (setgid(pwd->pw_gid) < 0) {
 851                                                 syslog(LOG_ERR,
 852                                                   "%s: can't set gid %d: %m",
 853                                                   sep->se_service, pwd->pw_gid);
 854                                                 _exit(EX_OSERR);
 855                                         }
 856                                         (void) initgroups(pwd->pw_name,
 857                                                         pwd->pw_gid);
 858                                         if (setuid(pwd->pw_uid) < 0) {
 859                                                 syslog(LOG_ERR,
 860                                                   "%s: can't set uid %d: %m",
 861                                                   sep->se_service, pwd->pw_uid);
 862                                                 _exit(EX_OSERR);
 863                                         }
 864                                 }
 865 #endif
 866                                 sigaction(SIGPIPE, &sapipe,
 867                                     (struct sigaction *)0);
 868                                 execv(sep->se_server, sep->se_argv);
 869                                 syslog(LOG_ERR,
 870                                     "cannot execute %s: %m", sep->se_server);
 871                                 if (sep->se_socktype != SOCK_STREAM)
 872                                         recv(0, buf, sizeof (buf), 0);
 873                             }
 874                             if (dofork)
 875                                 _exit(0);
 876                     }
 877                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
 878                             close(ctrl);
 879                 }
 880         }
 881 }
 882
 883 /*
 884  * Add a signal flag to the signal flag queue for later handling
 885  */
 886
 887 void
 888 flag_signal(int c)
 889 {
 890         char ch = c;
 891
 892         if (write(signalpipe[1], &ch, 1) != 1) {
 893                 syslog(LOG_ERR, "write: %m");
 894                 _exit(EX_OSERR);
 895         }
 896 }
 897
 898 /*
 899  * Record a new child pid for this service. If we've reached the
 900  * limit on children, then stop accepting incoming requests.
 901  */
 902
 903 void
 904 addchild(struct servtab *sep, pid_t pid)
 905 {
 906         if (sep->se_maxchild <= 0)
 907                 return;
 908 #ifdef SANITY_CHECK
 909         if (sep->se_numchild >= sep->se_maxchild) {
 910                 syslog(LOG_ERR, "%s: %d >= %d",
 911                     __func__, sep->se_numchild, sep->se_maxchild);
 912                 exit(EX_SOFTWARE);
 913         }
 914 #endif
 915         sep->se_pids[sep->se_numchild++] = pid;
 916         if (sep->se_numchild == sep->se_maxchild)
 917                 disable(sep);
 918 }
 919
 920 /*
 921  * Some child process has exited. See if it's on somebody's list.
 922  */
 923
 924 void
 925 flag_reapchild(int signo __unused)
 926 {
 927         flag_signal('C');
 928 }
 929
 930 void
 931 reapchild(void)
 932 {
 933         int k, status;
 934         pid_t pid;
 935         struct servtab *sep;
 936
 937         for (;;) {
 938                 pid = wait3(&status, WNOHANG, (struct rusage *)0);
 939                 if (pid <= 0)
 940                         break;
 941                 if (debug)
 942                         warnx("%d reaped, %s %u", pid,
 943                             WIFEXITED(status) ? "status" : "signal",
 944                             WIFEXITED(status) ? WEXITSTATUS(status)
 945                                 : WTERMSIG(status));
 946                 for (sep = servtab; sep; sep = sep->se_next) {
 947                         for (k = 0; k < sep->se_numchild; k++)
 948                                 if (sep->se_pids[k] == pid)
 949                                         break;
 950                         if (k == sep->se_numchild)
 951                                 continue;
 952                         if (sep->se_numchild == sep->se_maxchild)
 953                                 enable(sep);
 954                         sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
 955                         if (WIFSIGNALED(status) || WEXITSTATUS(status))
 956                                 syslog(LOG_WARNING,
 957                                     "%s[%d]: exited, %s %u",
 958                                     sep->se_server, pid,
 959                                     WIFEXITED(status) ? "status" : "signal",
 960                                     WIFEXITED(status) ? WEXITSTATUS(status)
 961                                         : WTERMSIG(status));
 962                         break;
 963                 }
 964                 reapchild_conn(pid);
 965         }
 966 }
 967
 968 void
 969 flag_config(int signo __unused)
 970 {
 971         flag_signal('H');
 972 }
 973
 974 void
 975 config(void)
 976 {
 977         struct servtab *sep, *new, **sepp;
 978         long omask;
 979         int new_nomapped;
 980 #ifdef LOGIN_CAP
 981         login_cap_t *lc = NULL;
 982 #endif
 983
 984         if (!setconfig()) {
 985                 syslog(LOG_ERR, "%s: %m", CONFIG);
 986                 return;
 987         }
 988         for (sep = servtab; sep; sep = sep->se_next)
 989                 sep->se_checked = 0;
 990         while ((new = getconfigent())) {
 991                 if (getpwnam(new->se_user) == NULL) {
 992                         syslog(LOG_ERR,
 993                                 "%s/%s: no such user '%s', service ignored",
 994                                 new->se_service, new->se_proto, new->se_user);
 995                         continue;
 996                 }
 997                 if (new->se_group && getgrnam(new->se_group) == NULL) {
 998                         syslog(LOG_ERR,
 999                                 "%s/%s: no such group '%s', service ignored",
1000                                 new->se_service, new->se_proto, new->se_group);
1001                         continue;
1002                 }
1003 #ifdef LOGIN_CAP
1004                 if ((lc = login_getclass(new->se_class)) == NULL) {
1005                         /* error syslogged by getclass */
1006                         syslog(LOG_ERR,
1007                                 "%s/%s: %s: login class error, service ignored",
1008                                 new->se_service, new->se_proto, new->se_class);
1009                         continue;
1010                 }
1011                 login_close(lc);
1012 #endif
1013                 new_nomapped = new->se_nomapped;
1014                 for (sep = servtab; sep; sep = sep->se_next)
1015                         if (strcmp(sep->se_service, new->se_service) == 0 &&
1016                             strcmp(sep->se_proto, new->se_proto) == 0 &&
1017                             sep->se_rpc == new->se_rpc &&
1018                             sep->se_socktype == new->se_socktype &&
1019                             sep->se_family == new->se_family)
1020                                 break;
1021                 if (sep != 0) {
1022                         int i;
1023
1024 #define SWAP(t,a, b) { t c = a; a = b; b = c; }
1025                         omask = sigblock(SIGBLOCK);
1026                         if (sep->se_nomapped != new->se_nomapped) {
1027                                 /* for rpc keep old nommaped till unregister */
1028                                 if (!sep->se_rpc)
1029                                         sep->se_nomapped = new->se_nomapped;
1030                                 sep->se_reset = 1;
1031                         }
1032                         /* copy over outstanding child pids */
1033                         if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
1034                                 new->se_numchild = sep->se_numchild;
1035                                 if (new->se_numchild > new->se_maxchild)
1036                                         new->se_numchild = new->se_maxchild;
1037                                 memcpy(new->se_pids, sep->se_pids,
1038                                     new->se_numchild * sizeof(*new->se_pids));
1039                         }
1040                         SWAP(pid_t *, sep->se_pids, new->se_pids);
1041                         sep->se_maxchild = new->se_maxchild;
1042                         sep->se_numchild = new->se_numchild;
1043                         sep->se_maxcpm = new->se_maxcpm;
1044                         resize_conn(sep, new->se_maxperip);
1045                         sep->se_maxperip = new->se_maxperip;
1046                         sep->se_bi = new->se_bi;
1047                         /* might need to turn on or off service now */
1048                         if (sep->se_fd >= 0) {
1049                               if (sep->se_maxchild > 0
1050                                   && sep->se_numchild == sep->se_maxchild) {
1051                                       if (FD_ISSET(sep->se_fd, &allsock))
1052                                           disable(sep);
1053                               } else {
1054                                       if (!FD_ISSET(sep->se_fd, &allsock))
1055                                           enable(sep);
1056                               }
1057                         }
1058                         sep->se_accept = new->se_accept;
1059                         SWAP(char *, sep->se_user, new->se_user);
1060                         SWAP(char *, sep->se_group, new->se_group);
1061 #ifdef LOGIN_CAP
1062                         SWAP(char *, sep->se_class, new->se_class);
1063 #endif
1064                         SWAP(char *, sep->se_server, new->se_server);
1065                         SWAP(char *, sep->se_server_name, new->se_server_name);
1066                         for (i = 0; i < MAXARGV; i++)
1067                                 SWAP(char *, sep->se_argv[i], new->se_argv[i]);
1068 #ifdef IPSEC
1069                         SWAP(char *, sep->se_policy, new->se_policy);
1070                         ipsecsetup(sep);
1071 #endif
1072                         sigsetmask(omask);
1073                         freeconfig(new);
1074                         if (debug)
1075                                 print_service("REDO", sep);
1076                 } else {
1077                         sep = enter(new);
1078                         if (debug)
1079                                 print_service("ADD ", sep);
1080                 }
1081                 sep->se_checked = 1;
1082                 if (ISMUX(sep)) {
1083                         sep->se_fd = -1;
1084                         continue;
1085                 }
1086                 switch (sep->se_family) {
1087                 case AF_INET:
1088                         if (!v4bind_ok) {
1089                                 sep->se_fd = -1;
1090                                 continue;
1091                         }
1092                         break;
1093 #ifdef INET6
1094                 case AF_INET6:
1095                         if (!v6bind_ok) {
1096                                 sep->se_fd = -1;
1097                                 continue;
1098                         }
1099                         break;
1100 #endif
1101                 }
1102                 if (!sep->se_rpc) {
1103                         if (sep->se_family != AF_UNIX) {
1104                                 sp = getservbyname(sep->se_service, sep->se_proto);
1105                                 if (sp == 0) {
1106                                         syslog(LOG_ERR, "%s/%s: unknown service",
1107                                         sep->se_service, sep->se_proto);
1108                                         sep->se_checked = 0;
1109                                         continue;
1110                                 }
1111                         }
1112                         switch (sep->se_family) {
1113                         case AF_INET:
1114                                 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1115                                         sep->se_ctrladdr4.sin_port =
1116                                                 sp->s_port;
1117                                         sep->se_reset = 1;
1118                                 }
1119                                 break;
1120 #ifdef INET6
1121                         case AF_INET6:
1122                                 if (sp->s_port !=
1123                                     sep->se_ctrladdr6.sin6_port) {
1124                                         sep->se_ctrladdr6.sin6_port =
1125                                                 sp->s_port;
1126                                         sep->se_reset = 1;
1127                                 }
1128                                 break;
1129 #endif
1130                         }
1131                         if (sep->se_reset != 0 && sep->se_fd >= 0)
1132                                 close_sep(sep);
1133                 } else {
1134                         rpc = getrpcbyname(sep->se_service);
1135                         if (rpc == 0) {
1136                                 syslog(LOG_ERR, "%s/%s unknown RPC service",
1137                                         sep->se_service, sep->se_proto);
1138                                 if (sep->se_fd != -1)
1139                                         (void) close(sep->se_fd);
1140                                 sep->se_fd = -1;
1141                                         continue;
1142                         }
1143                         if (sep->se_reset != 0 ||
1144                             rpc->r_number != sep->se_rpc_prog) {
1145                                 if (sep->se_rpc_prog)
1146                                         unregisterrpc(sep);
1147                                 sep->se_rpc_prog = rpc->r_number;
1148                                 if (sep->se_fd != -1)
1149                                         (void) close(sep->se_fd);
1150                                 sep->se_fd = -1;
1151                         }
1152                         sep->se_nomapped = new_nomapped;
1153                 }
1154                 sep->se_reset = 0;
1155                 if (sep->se_fd == -1)
1156                         setup(sep);
1157         }
1158         endconfig();
1159         /*
1160          * Purge anything not looked at above.
1161          */
1162         omask = sigblock(SIGBLOCK);
1163         sepp = &servtab;
1164         while ((sep = *sepp)) {
1165                 if (sep->se_checked) {
1166                         sepp = &sep->se_next;
1167                         continue;
1168                 }
1169                 *sepp = sep->se_next;
1170                 if (sep->se_fd >= 0)
1171                         close_sep(sep);
1172                 if (debug)
1173                         print_service("FREE", sep);
1174                 if (sep->se_rpc && sep->se_rpc_prog > 0)
1175                         unregisterrpc(sep);
1176                 freeconfig(sep);
1177                 free(sep);
1178         }
1179         (void) sigsetmask(omask);
1180 }
1181
1182 void
1183 unregisterrpc(struct servtab *sep)
1184 {
1185         u_int i;
1186         struct servtab *sepp;
1187         long omask;
1188         struct netconfig *netid4, *netid6;
1189
1190         omask = sigblock(SIGBLOCK);
1191         netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf;
1192         netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf;
1193         if (sep->se_family == AF_INET)
1194                 netid6 = NULL;
1195         else if (sep->se_nomapped)
1196                 netid4 = NULL;
1197         /*
1198          * Conflict if same prog and protocol - In that case one should look
1199          * to versions, but it is not interesting: having separate servers for
1200          * different versions does not work well.
1201          * Therefore one do not unregister if there is a conflict.
1202          * There is also transport conflict if destroying INET when INET46
1203          * exists, or destroying INET46 when INET exists
1204          */
1205         for (sepp = servtab; sepp; sepp = sepp->se_next) {
1206                 if (sepp == sep)
1207                         continue;
1208                 if (sepp->se_checked == 0 ||
1209                     !sepp->se_rpc ||
1210                     strcmp(sep->se_proto, sepp->se_proto) != 0 ||
1211                     sep->se_rpc_prog != sepp->se_rpc_prog)
1212                         continue;
1213                 if (sepp->se_family == AF_INET)
1214                         netid4 = NULL;
1215                 if (sepp->se_family == AF_INET6) {
1216                         netid6 = NULL;
1217                         if (!sep->se_nomapped)
1218                                 netid4 = NULL;
1219                 }
1220                 if (netid4 == NULL && netid6 == NULL)
1221                         return;
1222         }
1223         if (debug)
1224                 print_service("UNREG", sep);
1225         for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1226                 if (netid4)
1227                         rpcb_unset(sep->se_rpc_prog, i, netid4);
1228                 if (netid6)
1229                         rpcb_unset(sep->se_rpc_prog, i, netid6);
1230         }
1231         if (sep->se_fd != -1)
1232                 (void) close(sep->se_fd);
1233         sep->se_fd = -1;
1234         (void) sigsetmask(omask);
1235 }
1236
1237 void
1238 flag_retry(int signo __unused)
1239 {
1240         flag_signal('A');
1241 }
1242
1243 void
1244 retry(void)
1245 {
1246         struct servtab *sep;
1247
1248         timingout = 0;
1249         for (sep = servtab; sep; sep = sep->se_next)
1250                 if (sep->se_fd == -1 && !ISMUX(sep))
1251                         setup(sep);
1252 }
1253
1254 void
1255 setup(struct servtab *sep)
1256 {
1257         int on = 1;
1258
1259         if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1260                 if (debug)
1261                         warn("socket failed on %s/%s",
1262                                 sep->se_service, sep->se_proto);
1263                 syslog(LOG_ERR, "%s/%s: socket: %m",
1264                     sep->se_service, sep->se_proto);
1265                 return;
1266         }
1267         /* Set all listening sockets to close-on-exec. */
1268         if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) {
1269                 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m",
1270                     sep->se_service, sep->se_proto);
1271                 close(sep->se_fd);
1272                 return;
1273         }
1274 #define turnon(fd, opt) \
1275 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1276         if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1277             turnon(sep->se_fd, SO_DEBUG) < 0)
1278                 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1279         if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1280                 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1281 #ifdef SO_PRIVSTATE
1282         if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1283                 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1284 #endif
1285         /* tftpd opens a new connection then needs more infos */
1286         if ((sep->se_family == AF_INET6) &&
1287             (strcmp(sep->se_proto, "udp") == 0) &&
1288             (sep->se_accept == 0) &&
1289             (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
1290                         (char *)&on, sizeof (on)) < 0))
1291                 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1292         if (sep->se_family == AF_INET6) {
1293                 int flag = sep->se_nomapped ? 1 : 0;
1294                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1295                                (char *)&flag, sizeof (flag)) < 0)
1296                         syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1297         }
1298 #undef turnon
1299 #ifdef IPV6_FAITH
1300         if (sep->se_type == FAITH_TYPE) {
1301                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on,
1302                                 sizeof(on)) < 0) {
1303                         syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m");
1304                 }
1305         }
1306 #endif
1307 #ifdef IPSEC
1308         ipsecsetup(sep);
1309 #endif
1310         if (sep->se_family == AF_UNIX) {
1311                 (void) unlink(sep->se_ctrladdr_un.sun_path);
1312                 umask(0777); /* Make socket with conservative permissions */
1313         }
1314         if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1315             sep->se_ctrladdr_size) < 0) {
1316                 if (debug)
1317                         warn("bind failed on %s/%s",
1318                                 sep->se_service, sep->se_proto);
1319                 syslog(LOG_ERR, "%s/%s: bind: %m",
1320                     sep->se_service, sep->se_proto);
1321                 (void) close(sep->se_fd);
1322                 sep->se_fd = -1;
1323                 if (!timingout) {
1324                         timingout = 1;
1325                         alarm(RETRYTIME);
1326                 }
1327                 if (sep->se_family == AF_UNIX)
1328                         umask(mask);
1329                 return;
1330         }
1331         if (sep->se_family == AF_UNIX) {
1332                 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1333                 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1334                         syslog(LOG_ERR, "chown socket: %m");
1335                 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1336                         syslog(LOG_ERR, "chmod socket: %m");
1337                 umask(mask);
1338         }
1339         if (sep->se_rpc) {
1340                 u_int i;
1341                 socklen_t len = sep->se_ctrladdr_size;
1342                 struct netconfig *netid, *netid2 = NULL;
1343                 struct sockaddr_in sock;
1344                 struct netbuf nbuf, nbuf2;
1345
1346                 if (getsockname(sep->se_fd,
1347                                 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1348                         syslog(LOG_ERR, "%s/%s: getsockname: %m",
1349                                sep->se_service, sep->se_proto);
1350                         (void) close(sep->se_fd);
1351                         sep->se_fd = -1;
1352                         return;
1353                 }
1354                 nbuf.buf = &sep->se_ctrladdr;
1355                 nbuf.len = sep->se_ctrladdr.sa_len;
1356                 if (sep->se_family == AF_INET)
1357                         netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf;
1358                 else  {
1359                         netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf;
1360                         if (!sep->se_nomapped) { /* INET and INET6 */
1361                                 netid2 = netid==udp6conf? udpconf:tcpconf;
1362                                 memset(&sock, 0, sizeof sock);  /* ADDR_ANY */
1363                                 nbuf2.buf = &sock;
1364                                 nbuf2.len = sock.sin_len = sizeof sock;
1365                                 sock.sin_family = AF_INET;
1366                                 sock.sin_port = sep->se_ctrladdr6.sin6_port;
1367                         }
1368                 }
1369                 if (debug)
1370                         print_service("REG ", sep);
1371                 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1372                         rpcb_unset(sep->se_rpc_prog, i, netid);
1373                         rpcb_set(sep->se_rpc_prog, i, netid, &nbuf);
1374                         if (netid2) {
1375                                 rpcb_unset(sep->se_rpc_prog, i, netid2);
1376                                 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2);
1377                         }
1378                 }
1379         }
1380         if (sep->se_socktype == SOCK_STREAM)
1381                 listen(sep->se_fd, -1);
1382         enable(sep);
1383         if (debug) {
1384                 warnx("registered %s on %d",
1385                         sep->se_server, sep->se_fd);
1386         }
1387 }
1388
1389 #ifdef IPSEC
1390 void
1391 ipsecsetup(struct servtab *sep)
1392 {
1393         char *buf;
1394         char *policy_in = NULL;
1395         char *policy_out = NULL;
1396         int level;
1397         int opt;
1398
1399         switch (sep->se_family) {
1400         case AF_INET:
1401                 level = IPPROTO_IP;
1402                 opt = IP_IPSEC_POLICY;
1403                 break;
1404 #ifdef INET6
1405         case AF_INET6:
1406                 level = IPPROTO_IPV6;
1407                 opt = IPV6_IPSEC_POLICY;
1408                 break;
1409 #endif
1410         default:
1411                 return;
1412         }
1413
1414         if (!sep->se_policy || sep->se_policy[0] == '\0') {
1415                 static char def_in[] = "in entrust", def_out[] = "out entrust";
1416                 policy_in = def_in;
1417                 policy_out = def_out;
1418         } else {
1419                 if (!strncmp("in", sep->se_policy, 2))
1420                         policy_in = sep->se_policy;
1421                 else if (!strncmp("out", sep->se_policy, 3))
1422                         policy_out = sep->se_policy;
1423                 else {
1424                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1425                                 sep->se_policy);
1426                         return;
1427                 }
1428         }
1429
1430         if (policy_in != NULL) {
1431                 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1432                 if (buf != NULL) {
1433                         if (setsockopt(sep->se_fd, level, opt,
1434                                         buf, ipsec_get_policylen(buf)) < 0 &&
1435                             debug != 0)
1436                                 warnx("%s/%s: ipsec initialization failed; %s",
1437                                       sep->se_service, sep->se_proto,
1438                                       policy_in);
1439                         free(buf);
1440                 } else
1441                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1442                                 policy_in);
1443         }
1444         if (policy_out != NULL) {
1445                 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1446                 if (buf != NULL) {
1447                         if (setsockopt(sep->se_fd, level, opt,
1448                                         buf, ipsec_get_policylen(buf)) < 0 &&
1449                             debug != 0)
1450                                 warnx("%s/%s: ipsec initialization failed; %s",
1451                                       sep->se_service, sep->se_proto,
1452                                       policy_out);
1453                         free(buf);
1454                 } else
1455                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1456                                 policy_out);
1457         }
1458 }
1459 #endif
1460
1461 /*
1462  * Finish with a service and its socket.
1463  */
1464 void
1465 close_sep(struct servtab *sep)
1466 {
1467         if (sep->se_fd >= 0) {
1468                 if (FD_ISSET(sep->se_fd, &allsock))
1469                         disable(sep);
1470                 (void) close(sep->se_fd);
1471                 sep->se_fd = -1;
1472         }
1473         sep->se_count = 0;
1474         sep->se_numchild = 0;   /* forget about any existing children */
1475 }
1476
1477 int
1478 matchservent(const char *name1, const char *name2, const char *proto)
1479 {
1480         char **alias, *p;
1481         struct servent *se;
1482
1483         if (strcmp(proto, "unix") == 0) {
1484                 if ((p = strrchr(name1, '/')) != NULL)
1485                         name1 = p + 1;
1486                 if ((p = strrchr(name2, '/')) != NULL)
1487                         name2 = p + 1;
1488         }
1489         if (strcmp(name1, name2) == 0)
1490                 return(1);
1491         if ((se = getservbyname(name1, proto)) != NULL) {
1492                 if (strcmp(name2, se->s_name) == 0)
1493                         return(1);
1494                 for (alias = se->s_aliases; *alias; alias++)
1495                         if (strcmp(name2, *alias) == 0)
1496                                 return(1);
1497         }
1498         return(0);
1499 }
1500
1501 struct servtab *
1502 enter(struct servtab *cp)
1503 {
1504         struct servtab *sep;
1505         long omask;
1506
1507         sep = (struct servtab *)malloc(sizeof (*sep));
1508         if (sep == (struct servtab *)0) {
1509                 syslog(LOG_ERR, "malloc: %m");
1510                 exit(EX_OSERR);
1511         }
1512         *sep = *cp;
1513         sep->se_fd = -1;
1514         omask = sigblock(SIGBLOCK);
1515         sep->se_next = servtab;
1516         servtab = sep;
1517         sigsetmask(omask);
1518         return (sep);
1519 }
1520
1521 void
1522 enable(struct servtab *sep)
1523 {
1524         if (debug)
1525                 warnx(
1526                     "enabling %s, fd %d", sep->se_service, sep->se_fd);
1527 #ifdef SANITY_CHECK
1528         if (sep->se_fd < 0) {
1529                 syslog(LOG_ERR,
1530                     "%s: %s: bad fd", __func__, sep->se_service);
1531                 exit(EX_SOFTWARE);
1532         }
1533         if (ISMUX(sep)) {
1534                 syslog(LOG_ERR,
1535                     "%s: %s: is mux", __func__, sep->se_service);
1536                 exit(EX_SOFTWARE);
1537         }
1538         if (FD_ISSET(sep->se_fd, &allsock)) {
1539                 syslog(LOG_ERR,
1540                     "%s: %s: not off", __func__, sep->se_service);
1541                 exit(EX_SOFTWARE);
1542         }
1543         nsock++;
1544 #endif
1545         FD_SET(sep->se_fd, &allsock);
1546         if (sep->se_fd > maxsock)
1547                 maxsock = sep->se_fd;
1548 }
1549
1550 void
1551 disable(struct servtab *sep)
1552 {
1553         if (debug)
1554                 warnx(
1555                     "disabling %s, fd %d", sep->se_service, sep->se_fd);
1556 #ifdef SANITY_CHECK
1557         if (sep->se_fd < 0) {
1558                 syslog(LOG_ERR,
1559                     "%s: %s: bad fd", __func__, sep->se_service);
1560                 exit(EX_SOFTWARE);
1561         }
1562         if (ISMUX(sep)) {
1563                 syslog(LOG_ERR,
1564                     "%s: %s: is mux", __func__, sep->se_service);
1565                 exit(EX_SOFTWARE);
1566         }
1567         if (!FD_ISSET(sep->se_fd, &allsock)) {
1568                 syslog(LOG_ERR,
1569                     "%s: %s: not on", __func__, sep->se_service);
1570                 exit(EX_SOFTWARE);
1571         }
1572         if (nsock == 0) {
1573                 syslog(LOG_ERR, "%s: nsock=0", __func__);
1574                 exit(EX_SOFTWARE);
1575         }
1576         nsock--;
1577 #endif
1578         FD_CLR(sep->se_fd, &allsock);
1579         if (sep->se_fd == maxsock)
1580                 maxsock--;
1581 }
1582
1583 FILE    *fconfig = NULL;
1584 struct  servtab serv;
1585 char    line[LINE_MAX];
1586
1587 int
1588 setconfig(void)
1589 {
1590
1591         if (fconfig != NULL) {
1592                 fseek(fconfig, 0L, SEEK_SET);
1593                 return (1);
1594         }
1595         fconfig = fopen(CONFIG, "r");
1596         return (fconfig != NULL);
1597 }
1598
1599 void
1600 endconfig(void)
1601 {
1602         if (fconfig) {
1603                 (void) fclose(fconfig);
1604                 fconfig = NULL;
1605         }
1606 }
1607
1608 struct servtab *
1609 getconfigent(void)
1610 {
1611         struct servtab *sep = &serv;
1612         int argc;
1613         char *cp, *arg, *s;
1614         char *versp;
1615         static char TCPMUX_TOKEN[] = "tcpmux/";
1616 #define MUX_LEN         (sizeof(TCPMUX_TOKEN)-1)
1617 #ifdef IPSEC
1618         char *policy;
1619 #endif
1620         int v4bind;
1621 #ifdef INET6
1622         int v6bind;
1623 #endif
1624         int i;
1625
1626 #ifdef IPSEC
1627         policy = NULL;
1628 #endif
1629 more:
1630         v4bind = 0;
1631 #ifdef INET6
1632         v6bind = 0;
1633 #endif
1634         while ((cp = nextline(fconfig)) != NULL) {
1635 #ifdef IPSEC
1636                 /* lines starting with #@ is not a comment, but the policy */
1637                 if (cp[0] == '#' && cp[1] == '@') {
1638                         char *p;
1639                         for (p = cp + 2; p && *p && isspace(*p); p++)
1640                                 ;
1641                         if (*p == '\0') {
1642                                 if (policy)
1643                                         free(policy);
1644                                 policy = NULL;
1645                         } else if (ipsec_get_policylen(p) >= 0) {
1646                                 if (policy)
1647                                         free(policy);
1648                                 policy = newstr(p);
1649                         } else {
1650                                 syslog(LOG_ERR,
1651                                         "%s: invalid ipsec policy \"%s\"",
1652                                         CONFIG, p);
1653                                 exit(EX_CONFIG);
1654                         }
1655                 }
1656 #endif
1657                 if (*cp == '#' || *cp == '\0')
1658                         continue;
1659                 break;
1660         }
1661         if (cp == NULL)
1662                 return ((struct servtab *)0);
1663         /*
1664          * clear the static buffer, since some fields (se_ctrladdr,
1665          * for example) don't get initialized here.
1666          */
1667         memset(sep, 0, sizeof *sep);
1668         arg = skip(&cp);
1669         if (cp == NULL) {
1670                 /* got an empty line containing just blanks/tabs. */
1671                 goto more;
1672         }
1673         if (arg[0] == ':') { /* :user:group:perm: */
1674                 char *user, *group, *perm;
1675                 struct passwd *pw;
1676                 struct group *gr;
1677                 user = arg+1;
1678                 if ((group = strchr(user, ':')) == NULL) {
1679                         syslog(LOG_ERR, "no group after user '%s'", user);
1680                         goto more;
1681                 }
1682                 *group++ = '\0';
1683                 if ((perm = strchr(group, ':')) == NULL) {
1684                         syslog(LOG_ERR, "no mode after group '%s'", group);
1685                         goto more;
1686                 }
1687                 *perm++ = '\0';
1688                 if ((pw = getpwnam(user)) == NULL) {
1689                         syslog(LOG_ERR, "no such user '%s'", user);
1690                         goto more;
1691                 }
1692                 sep->se_sockuid = pw->pw_uid;
1693                 if ((gr = getgrnam(group)) == NULL) {
1694                         syslog(LOG_ERR, "no such user '%s'", group);
1695                         goto more;
1696                 }
1697                 sep->se_sockgid = gr->gr_gid;
1698                 sep->se_sockmode = strtol(perm, &arg, 8);
1699                 if (*arg != ':') {
1700                         syslog(LOG_ERR, "bad mode '%s'", perm);
1701                         goto more;
1702                 }
1703                 *arg++ = '\0';
1704         } else {
1705                 sep->se_sockuid = euid;
1706                 sep->se_sockgid = egid;
1707                 sep->se_sockmode = 0200;
1708         }
1709         if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1710                 char *c = arg + MUX_LEN;
1711                 if (*c == '+') {
1712                         sep->se_type = MUXPLUS_TYPE;
1713                         c++;
1714                 } else
1715                         sep->se_type = MUX_TYPE;
1716                 sep->se_service = newstr(c);
1717         } else {
1718                 sep->se_service = newstr(arg);
1719                 sep->se_type = NORM_TYPE;
1720         }
1721         arg = sskip(&cp);
1722         if (strcmp(arg, "stream") == 0)
1723                 sep->se_socktype = SOCK_STREAM;
1724         else if (strcmp(arg, "dgram") == 0)
1725                 sep->se_socktype = SOCK_DGRAM;
1726         else if (strcmp(arg, "rdm") == 0)
1727                 sep->se_socktype = SOCK_RDM;
1728         else if (strcmp(arg, "seqpacket") == 0)
1729                 sep->se_socktype = SOCK_SEQPACKET;
1730         else if (strcmp(arg, "raw") == 0)
1731                 sep->se_socktype = SOCK_RAW;
1732         else
1733                 sep->se_socktype = -1;
1734
1735         arg = sskip(&cp);
1736         if (strncmp(arg, "tcp", 3) == 0) {
1737                 sep->se_proto = newstr(strsep(&arg, "/"));
1738                 if (arg != NULL) {
1739                         if (strcmp(arg, "faith") == 0)
1740                                 sep->se_type = FAITH_TYPE;
1741                 }
1742         } else {
1743                 if (sep->se_type == NORM_TYPE &&
1744                     strncmp(arg, "faith/", 6) == 0) {
1745                         arg += 6;
1746                         sep->se_type = FAITH_TYPE;
1747                 }
1748                 sep->se_proto = newstr(arg);
1749         }
1750         if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1751                 memmove(sep->se_proto, sep->se_proto + 4,
1752                     strlen(sep->se_proto) + 1 - 4);
1753                 sep->se_rpc = 1;
1754                 sep->se_rpc_prog = sep->se_rpc_lowvers =
1755                         sep->se_rpc_highvers = 0;
1756                 if ((versp = strrchr(sep->se_service, '/'))) {
1757                         *versp++ = '\0';
1758                         switch (sscanf(versp, "%u-%u",
1759                                        &sep->se_rpc_lowvers,
1760                                        &sep->se_rpc_highvers)) {
1761                         case 2:
1762                                 break;
1763                         case 1:
1764                                 sep->se_rpc_highvers =
1765                                         sep->se_rpc_lowvers;
1766                                 break;
1767                         default:
1768                                 syslog(LOG_ERR,
1769                                         "bad RPC version specifier; %s",
1770                                         sep->se_service);
1771                                 freeconfig(sep);
1772                                 goto more;
1773                         }
1774                 }
1775                 else {
1776                         sep->se_rpc_lowvers =
1777                                 sep->se_rpc_highvers = 1;
1778                 }
1779         }
1780         sep->se_nomapped = 0;
1781         if (strcmp(sep->se_proto, "unix") == 0) {
1782                 sep->se_family = AF_UNIX;
1783         } else {
1784                 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1785 #ifdef INET6
1786                         if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1787                                 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1788                                 v6bind = 1;
1789                                 continue;
1790                         }
1791 #endif
1792                         if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1793                                 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1794                                 v4bind = 1;
1795                                 continue;
1796                         }
1797                         /* illegal version num */
1798                         syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1799                         freeconfig(sep);
1800                         goto more;
1801                 }
1802 #ifdef INET6
1803                 if (v6bind && !v6bind_ok) {
1804                         syslog(LOG_INFO, "IPv6 bind is ignored for %s",
1805                                sep->se_service);
1806                         if (v4bind && v4bind_ok)
1807                                 v6bind = 0;
1808                         else {
1809                                 freeconfig(sep);
1810                                 goto more;
1811                         }
1812                 }
1813                 if (v6bind) {
1814                         sep->se_family = AF_INET6;
1815                         if (!v4bind || !v4bind_ok)
1816                                 sep->se_nomapped = 1;
1817                 } else
1818 #endif
1819                 { /* default to v4 bind if not v6 bind */
1820                         if (!v4bind_ok) {
1821                                 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1822                                        sep->se_service);
1823                                 freeconfig(sep);
1824                                 goto more;
1825                         }
1826                         sep->se_family = AF_INET;
1827                 }
1828         }
1829         /* init ctladdr */
1830         switch(sep->se_family) {
1831         case AF_INET:
1832                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1833                        sizeof(sep->se_ctrladdr4));
1834                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1835                 break;
1836 #ifdef INET6
1837         case AF_INET6:
1838                 memcpy(&sep->se_ctrladdr6, bind_sa6,
1839                        sizeof(sep->se_ctrladdr6));
1840                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1841                 break;
1842 #endif
1843         case AF_UNIX:
1844                 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1845                         syslog(LOG_ERR,
1846                             "domain socket pathname too long for service %s",
1847                             sep->se_service);
1848                         goto more;
1849                 }
1850                 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1851                 sep->se_ctrladdr_un.sun_family = sep->se_family;
1852                 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1853                 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1854                 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1855         }
1856         arg = sskip(&cp);
1857         if (!strncmp(arg, "wait", 4))
1858                 sep->se_accept = 0;
1859         else if (!strncmp(arg, "nowait", 6))
1860                 sep->se_accept = 1;
1861         else {
1862                 syslog(LOG_ERR,
1863                         "%s: bad wait/nowait for service %s",
1864                         CONFIG, sep->se_service);
1865                 goto more;
1866         }
1867         sep->se_maxchild = -1;
1868         sep->se_maxcpm = -1;
1869         sep->se_maxperip = -1;
1870         if ((s = strchr(arg, '/')) != NULL) {
1871                 char *eptr;
1872                 u_long val;
1873
1874                 val = strtoul(s + 1, &eptr, 10);
1875                 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1876                         syslog(LOG_ERR,
1877                                 "%s: bad max-child for service %s",
1878                                 CONFIG, sep->se_service);
1879                         goto more;
1880                 }
1881                 if (debug)
1882                         if (!sep->se_accept && val != 1)
1883                                 warnx("maxchild=%lu for wait service %s"
1884                                     " not recommended", val, sep->se_service);
1885                 sep->se_maxchild = val;
1886                 if (*eptr == '/')
1887                         sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1888                 if (*eptr == '/')
1889                         sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1890                 /*
1891                  * explicitly do not check for \0 for future expansion /
1892                  * backwards compatibility
1893                  */
1894         }
1895         if (ISMUX(sep)) {
1896                 /*
1897                  * Silently enforce "nowait" mode for TCPMUX services
1898                  * since they don't have an assigned port to listen on.
1899                  */
1900                 sep->se_accept = 1;
1901                 if (strcmp(sep->se_proto, "tcp")) {
1902                         syslog(LOG_ERR,
1903                                 "%s: bad protocol for tcpmux service %s",
1904                                 CONFIG, sep->se_service);
1905                         goto more;
1906                 }
1907                 if (sep->se_socktype != SOCK_STREAM) {
1908                         syslog(LOG_ERR,
1909                                 "%s: bad socket type for tcpmux service %s",
1910                                 CONFIG, sep->se_service);
1911                         goto more;
1912                 }
1913         }
1914         sep->se_user = newstr(sskip(&cp));
1915 #ifdef LOGIN_CAP
1916         if ((s = strrchr(sep->se_user, '/')) != NULL) {
1917                 *s = '\0';
1918                 sep->se_class = newstr(s + 1);
1919         } else
1920                 sep->se_class = newstr(RESOURCE_RC);
1921 #endif
1922         if ((s = strrchr(sep->se_user, ':')) != NULL) {
1923                 *s = '\0';
1924                 sep->se_group = newstr(s + 1);
1925         } else
1926                 sep->se_group = NULL;
1927         sep->se_server = newstr(sskip(&cp));
1928         if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1929                 sep->se_server_name++;
1930         if (strcmp(sep->se_server, "internal") == 0) {
1931                 struct biltin *bi;
1932
1933                 for (bi = biltins; bi->bi_service; bi++)
1934                         if (bi->bi_socktype == sep->se_socktype &&
1935                             matchservent(bi->bi_service, sep->se_service,
1936                             sep->se_proto))
1937                                 break;
1938                 if (bi->bi_service == 0) {
1939                         syslog(LOG_ERR, "internal service %s unknown",
1940                                 sep->se_service);
1941                         goto more;
1942                 }
1943                 sep->se_accept = 1;     /* force accept mode for built-ins */
1944                 sep->se_bi = bi;
1945         } else
1946                 sep->se_bi = NULL;
1947         if (sep->se_maxperip < 0)
1948                 sep->se_maxperip = maxperip;
1949         if (sep->se_maxcpm < 0)
1950                 sep->se_maxcpm = maxcpm;
1951         if (sep->se_maxchild < 0) {     /* apply default max-children */
1952                 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1953                         sep->se_maxchild = sep->se_bi->bi_maxchild;
1954                 else if (sep->se_accept)
1955                         sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1956                 else
1957                         sep->se_maxchild = 1;
1958         }
1959         if (sep->se_maxchild > 0) {
1960                 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1961                 if (sep->se_pids == NULL) {
1962                         syslog(LOG_ERR, "malloc: %m");
1963                         exit(EX_OSERR);
1964                 }
1965         }
1966         argc = 0;
1967         for (arg = skip(&cp); cp; arg = skip(&cp))
1968                 if (argc < MAXARGV) {
1969                         sep->se_argv[argc++] = newstr(arg);
1970                 } else {
1971                         syslog(LOG_ERR,
1972                                 "%s: too many arguments for service %s",
1973                                 CONFIG, sep->se_service);
1974                         goto more;
1975                 }
1976         while (argc <= MAXARGV)
1977                 sep->se_argv[argc++] = NULL;
1978         for (i = 0; i < PERIPSIZE; ++i)
1979                 LIST_INIT(&sep->se_conn[i]);
1980 #ifdef IPSEC
1981         sep->se_policy = policy ? newstr(policy) : NULL;
1982 #endif
1983         return (sep);
1984 }
1985
1986 void
1987 freeconfig(struct servtab *cp)
1988 {
1989         int i;
1990
1991         if (cp->se_service)
1992                 free(cp->se_service);
1993         if (cp->se_proto)
1994                 free(cp->se_proto);
1995         if (cp->se_user)
1996                 free(cp->se_user);
1997         if (cp->se_group)
1998                 free(cp->se_group);
1999 #ifdef LOGIN_CAP
2000         if (cp->se_class)
2001                 free(cp->se_class);
2002 #endif
2003         if (cp->se_server)
2004                 free(cp->se_server);
2005         if (cp->se_pids)
2006                 free(cp->se_pids);
2007         for (i = 0; i < MAXARGV; i++)
2008                 if (cp->se_argv[i])
2009                         free(cp->se_argv[i]);
2010         free_connlist(cp);
2011 #ifdef IPSEC
2012         if (cp->se_policy)
2013                 free(cp->se_policy);
2014 #endif
2015 }
2016
2017
2018 /*
2019  * Safe skip - if skip returns null, log a syntax error in the
2020  * configuration file and exit.
2021  */
2022 char *
2023 sskip(char **cpp)
2024 {
2025         char *cp;
2026
2027         cp = skip(cpp);
2028         if (cp == NULL) {
2029                 syslog(LOG_ERR, "%s: syntax error", CONFIG);
2030                 exit(EX_DATAERR);
2031         }
2032         return (cp);
2033 }
2034
2035 char *
2036 skip(char **cpp)
2037 {
2038         char *cp = *cpp;
2039         char *start;
2040         char quote = '\0';
2041
2042 again:
2043         while (*cp == ' ' || *cp == '\t')
2044                 cp++;
2045         if (*cp == '\0') {
2046                 int c;
2047
2048                 c = getc(fconfig);
2049                 (void) ungetc(c, fconfig);
2050                 if (c == ' ' || c == '\t')
2051                         if ((cp = nextline(fconfig)))
2052                                 goto again;
2053                 *cpp = (char *)0;
2054                 return ((char *)0);
2055         }
2056         if (*cp == '"' || *cp == '\'')
2057                 quote = *cp++;
2058         start = cp;
2059         if (quote)
2060                 while (*cp && *cp != quote)
2061                         cp++;
2062         else
2063                 while (*cp && *cp != ' ' && *cp != '\t')
2064                         cp++;
2065         if (*cp != '\0')
2066                 *cp++ = '\0';
2067         *cpp = cp;
2068         return (start);
2069 }
2070
2071 char *
2072 nextline(FILE *fd)
2073 {
2074         char *cp;
2075
2076         if (fgets(line, sizeof (line), fd) == NULL)
2077                 return ((char *)0);
2078         cp = strchr(line, '\n');
2079         if (cp)
2080                 *cp = '\0';
2081         return (line);
2082 }
2083
2084 char *
2085 newstr(const char *cp)
2086 {
2087         char *cr;
2088
2089         if ((cr = strdup(cp != NULL ? cp : "")))
2090                 return (cr);
2091         syslog(LOG_ERR, "strdup: %m");
2092         exit(EX_OSERR);
2093 }
2094
2095 void
2096 inetd_setproctitle(const char *a, int s)
2097 {
2098         socklen_t size;
2099         struct sockaddr_storage ss;
2100         char buf[80], pbuf[NI_MAXHOST];
2101
2102         size = sizeof(ss);
2103         if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2104                 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2105                             NULL, 0, NI_NUMERICHOST);
2106                 (void) sprintf(buf, "%s [%s]", a, pbuf);
2107         } else
2108                 (void) sprintf(buf, "%s", a);
2109         setproctitle("%s", buf);
2110 }
2111
2112 int
2113 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2114 {
2115         struct servtab *se2;
2116         char pname[NI_MAXHOST];
2117
2118         for (se2 = servtab; se2; se2 = se2->se_next) {
2119                 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2120                         continue;
2121
2122                 switch (se2->se_family) {
2123                 case AF_INET:
2124                         if (((const struct sockaddr_in *)sa)->sin_port ==
2125                             se2->se_ctrladdr4.sin_port)
2126                                 goto isloop;
2127                         continue;
2128 #ifdef INET6
2129                 case AF_INET6:
2130                         if (((const struct sockaddr_in6 *)sa)->sin6_port ==
2131                             se2->se_ctrladdr6.sin6_port)
2132                                 goto isloop;
2133                         continue;
2134 #endif
2135                 default:
2136                         continue;
2137                 }
2138         isloop:
2139                 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2140                             NI_NUMERICHOST);
2141                 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2142                        sep->se_service, sep->se_proto,
2143                        se2->se_service, se2->se_proto,
2144                        pname);
2145                 return 1;
2146         }
2147         return 0;
2148 }
2149
2150 /*
2151  * print_service:
2152  *      Dump relevant information to stderr
2153  */
2154 void
2155 print_service(const char *action, const struct servtab *sep)
2156 {
2157         fprintf(stderr,
2158             "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2159 #ifdef LOGIN_CAP
2160             "class=%s"
2161 #endif
2162             " builtin=%p server=%s"
2163 #ifdef IPSEC
2164             " policy=\"%s\""
2165 #endif
2166             "\n",
2167             action, sep->se_service, sep->se_proto,
2168             sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2169 #ifdef LOGIN_CAP
2170             sep->se_class,
2171 #endif
2172             (void *) sep->se_bi, sep->se_server
2173 #ifdef IPSEC
2174             , (sep->se_policy ? sep->se_policy : "")
2175 #endif
2176             );
2177 }
2178
2179 #define CPMHSIZE        256
2180 #define CPMHMASK        (CPMHSIZE-1)
2181 #define CHTGRAN         10
2182 #define CHTSIZE         6
2183
2184 typedef struct CTime {
2185         unsigned long   ct_Ticks;
2186         int             ct_Count;
2187 } CTime;
2188
2189 typedef struct CHash {
2190         union {
2191                 struct in_addr  c4_Addr;
2192                 struct in6_addr c6_Addr;
2193         } cu_Addr;
2194 #define ch_Addr4        cu_Addr.c4_Addr
2195 #define ch_Addr6        cu_Addr.c6_Addr
2196         int             ch_Family;
2197         time_t          ch_LTime;
2198         char            *ch_Service;
2199         CTime           ch_Times[CHTSIZE];
2200 } CHash;
2201
2202 CHash   CHashAry[CPMHSIZE];
2203
2204 int
2205 cpmip(const struct servtab *sep, int ctrl)
2206 {
2207         struct sockaddr_storage rss;
2208         socklen_t rssLen = sizeof(rss);
2209         int r = 0;
2210
2211         /*
2212          * If getpeername() fails, just let it through (if logging is
2213          * enabled the condition is caught elsewhere)
2214          */
2215
2216         if (sep->se_maxcpm > 0 &&
2217            (sep->se_family == AF_INET || sep->se_family == AF_INET6) &&
2218             getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2219                 time_t t = time(NULL);
2220                 int hv = 0xABC3D20F;
2221                 int i;
2222                 int cnt = 0;
2223                 CHash *chBest = NULL;
2224                 unsigned int ticks = t / CHTGRAN;
2225                 struct sockaddr_in *sin4;
2226 #ifdef INET6
2227                 struct sockaddr_in6 *sin6;
2228 #endif
2229
2230                 sin4 = (struct sockaddr_in *)&rss;
2231 #ifdef INET6
2232                 sin6 = (struct sockaddr_in6 *)&rss;
2233 #endif
2234                 {
2235                         char *p;
2236                         int addrlen;
2237
2238                         switch (rss.ss_family) {
2239                         case AF_INET:
2240                                 p = (char *)&sin4->sin_addr;
2241                                 addrlen = sizeof(struct in_addr);
2242                                 break;
2243 #ifdef INET6
2244                         case AF_INET6:
2245                                 p = (char *)&sin6->sin6_addr;
2246                                 addrlen = sizeof(struct in6_addr);
2247                                 break;
2248 #endif
2249                         default:
2250                                 /* should not happen */
2251                                 return -1;
2252                         }
2253
2254                         for (i = 0; i < addrlen; ++i, ++p) {
2255                                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2256                         }
2257                         hv = (hv ^ (hv >> 16));
2258                 }
2259                 for (i = 0; i < 5; ++i) {
2260                         CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2261
2262                         if (rss.ss_family == AF_INET &&
2263                             ch->ch_Family == AF_INET &&
2264                             sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2265                             ch->ch_Service && strcmp(sep->se_service,
2266                             ch->ch_Service) == 0) {
2267                                 chBest = ch;
2268                                 break;
2269                         }
2270 #ifdef INET6
2271                         if (rss.ss_family == AF_INET6 &&
2272                             ch->ch_Family == AF_INET6 &&
2273                             IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2274                                                &ch->ch_Addr6) != 0 &&
2275                             ch->ch_Service && strcmp(sep->se_service,
2276                             ch->ch_Service) == 0) {
2277                                 chBest = ch;
2278                                 break;
2279                         }
2280 #endif
2281                         if (chBest == NULL || ch->ch_LTime == 0 ||
2282                             ch->ch_LTime < chBest->ch_LTime) {
2283                                 chBest = ch;
2284                         }
2285                 }
2286                 if ((rss.ss_family == AF_INET &&
2287                      (chBest->ch_Family != AF_INET ||
2288                       sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2289                     chBest->ch_Service == NULL ||
2290                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2291                         chBest->ch_Family = sin4->sin_family;
2292                         chBest->ch_Addr4 = sin4->sin_addr;
2293                         if (chBest->ch_Service)
2294                                 free(chBest->ch_Service);
2295                         chBest->ch_Service = strdup(sep->se_service);
2296                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2297                 }
2298 #ifdef INET6
2299                 if ((rss.ss_family == AF_INET6 &&
2300                      (chBest->ch_Family != AF_INET6 ||
2301                       IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2302                                          &chBest->ch_Addr6) == 0)) ||
2303                     chBest->ch_Service == NULL ||
2304                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2305                         chBest->ch_Family = sin6->sin6_family;
2306                         chBest->ch_Addr6 = sin6->sin6_addr;
2307                         if (chBest->ch_Service)
2308                                 free(chBest->ch_Service);
2309                         chBest->ch_Service = strdup(sep->se_service);
2310                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2311                 }
2312 #endif
2313                 chBest->ch_LTime = t;
2314                 {
2315                         CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2316                         if (ct->ct_Ticks != ticks) {
2317                                 ct->ct_Ticks = ticks;
2318                                 ct->ct_Count = 0;
2319                         }
2320                         ++ct->ct_Count;
2321                 }
2322                 for (i = 0; i < CHTSIZE; ++i) {
2323                         CTime *ct = &chBest->ch_Times[i];
2324                         if (ct->ct_Ticks <= ticks &&
2325                             ct->ct_Ticks >= ticks - CHTSIZE) {
2326                                 cnt += ct->ct_Count;
2327                         }
2328                 }
2329                 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) {
2330                         char pname[NI_MAXHOST];
2331
2332                         getnameinfo((struct sockaddr *)&rss,
2333                                     ((struct sockaddr *)&rss)->sa_len,
2334                                     pname, sizeof(pname), NULL, 0,
2335                                     NI_NUMERICHOST);
2336                         r = -1;
2337                         syslog(LOG_ERR,
2338                             "%s from %s exceeded counts/min (limit %d/min)",
2339                             sep->se_service, pname,
2340                             sep->se_maxcpm);
2341                 }
2342         }
2343         return(r);
2344 }
2345
2346 static struct conninfo *
2347 search_conn(struct servtab *sep, int ctrl)
2348 {
2349         struct sockaddr_storage ss;
2350         socklen_t sslen = sizeof(ss);
2351         struct conninfo *conn;
2352         int hv;
2353         char pname[NI_MAXHOST],  pname2[NI_MAXHOST];
2354
2355         if (sep->se_maxperip <= 0)
2356                 return NULL;
2357
2358         /*
2359          * If getpeername() fails, just let it through (if logging is
2360          * enabled the condition is caught elsewhere)
2361          */
2362         if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2363                 return NULL;
2364
2365         switch (ss.ss_family) {
2366         case AF_INET:
2367                 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2368                     sizeof(struct in_addr));
2369                 break;
2370 #ifdef INET6
2371         case AF_INET6:
2372                 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2373                     sizeof(struct in6_addr));
2374                 break;
2375 #endif
2376         default:
2377                 /*
2378                  * Since we only support AF_INET and AF_INET6, just
2379                  * let other than AF_INET and AF_INET6 through.
2380                  */
2381                 return NULL;
2382         }
2383
2384         if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2385             NULL, 0, NI_NUMERICHOST) != 0)
2386                 return NULL;
2387
2388         LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2389                 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2390                     conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2391                     NI_NUMERICHOST) == 0 &&
2392                     strcmp(pname, pname2) == 0)
2393                         break;
2394         }
2395
2396         if (conn == NULL) {
2397                 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2398                         syslog(LOG_ERR, "malloc: %m");
2399                         exit(EX_OSERR);
2400                 }
2401                 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2402                 if (conn->co_proc == NULL) {
2403                         syslog(LOG_ERR, "malloc: %m");
2404                         exit(EX_OSERR);
2405                 }
2406                 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2407                 conn->co_numchild = 0;
2408                 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2409         }
2410
2411         /*
2412          * Since a child process is not invoked yet, we cannot
2413          * determine a pid of a child.  So, co_proc and co_numchild
2414          * should be filled leter.
2415          */
2416
2417         return conn;
2418 }
2419
2420 static int
2421 room_conn(struct servtab *sep, struct conninfo *conn)
2422 {
2423         char pname[NI_MAXHOST];
2424
2425         if (conn->co_numchild >= sep->se_maxperip) {
2426                 getnameinfo((struct sockaddr *)&conn->co_addr,
2427                     conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2428                     NI_NUMERICHOST);
2429                 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2430                     sep->se_service, pname, sep->se_maxperip);
2431                 return 0;
2432         }
2433         return 1;
2434 }
2435
2436 static void
2437 addchild_conn(struct conninfo *conn, pid_t pid)
2438 {
2439         struct procinfo *proc;
2440
2441         if (conn == NULL)
2442                 return;
2443
2444         if ((proc = search_proc(pid, 1)) != NULL) {
2445                 if (proc->pr_conn != NULL) {
2446                         syslog(LOG_ERR,
2447                             "addchild_conn: child already on process list");
2448                         exit(EX_OSERR);
2449                 }
2450                 proc->pr_conn = conn;
2451         }
2452
2453         conn->co_proc[conn->co_numchild++] = proc;
2454 }
2455
2456 static void
2457 reapchild_conn(pid_t pid)
2458 {
2459         struct procinfo *proc;
2460         struct conninfo *conn;
2461         int i;
2462
2463         if ((proc = search_proc(pid, 0)) == NULL)
2464                 return;
2465         if ((conn = proc->pr_conn) == NULL)
2466                 return;
2467         for (i = 0; i < conn->co_numchild; ++i)
2468                 if (conn->co_proc[i] == proc) {
2469                         conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2470                         break;
2471                 }
2472         free_proc(proc);
2473         free_conn(conn);
2474 }
2475
2476 static void
2477 resize_conn(struct servtab *sep, int maxpip)
2478 {
2479         struct conninfo *conn;
2480         int i, j;
2481
2482         if (sep->se_maxperip <= 0)
2483                 return;
2484         if (maxpip <= 0) {
2485                 free_connlist(sep);
2486                 return;
2487         }
2488         for (i = 0; i < PERIPSIZE; ++i) {
2489                 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2490                         for (j = maxpip; j < conn->co_numchild; ++j)
2491                                 free_proc(conn->co_proc[j]);
2492                         conn->co_proc = realloc(conn->co_proc,
2493                             maxpip * sizeof(*conn->co_proc));
2494                         if (conn->co_proc == NULL) {
2495                                 syslog(LOG_ERR, "realloc: %m");
2496                                 exit(EX_OSERR);
2497                         }
2498                         if (conn->co_numchild > maxpip)
2499                                 conn->co_numchild = maxpip;
2500                 }
2501         }
2502 }
2503
2504 static void
2505 free_connlist(struct servtab *sep)
2506 {
2507         struct conninfo *conn;
2508         int i, j;
2509
2510         for (i = 0; i < PERIPSIZE; ++i) {
2511                 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2512                         for (j = 0; j < conn->co_numchild; ++j)
2513                                 free_proc(conn->co_proc[j]);
2514                         conn->co_numchild = 0;
2515                         free_conn(conn);
2516                 }
2517         }
2518 }
2519
2520 static void
2521 free_conn(struct conninfo *conn)
2522 {
2523         if (conn == NULL)
2524                 return;
2525         if (conn->co_numchild <= 0) {
2526                 LIST_REMOVE(conn, co_link);
2527                 free(conn->co_proc);
2528                 free(conn);
2529         }
2530 }
2531
2532 static struct procinfo *
2533 search_proc(pid_t pid, int add)
2534 {
2535         struct procinfo *proc;
2536         int hv;
2537
2538         hv = hashval((char *)&pid, sizeof(pid));
2539         LIST_FOREACH(proc, &proctable[hv], pr_link) {
2540                 if (proc->pr_pid == pid)
2541                         break;
2542         }
2543         if (proc == NULL && add) {
2544                 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2545                         syslog(LOG_ERR, "malloc: %m");
2546                         exit(EX_OSERR);
2547                 }
2548                 proc->pr_pid = pid;
2549                 proc->pr_conn = NULL;
2550                 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2551         }
2552         return proc;
2553 }
2554
2555 static void
2556 free_proc(struct procinfo *proc)
2557 {
2558         if (proc == NULL)
2559                 return;
2560         LIST_REMOVE(proc, pr_link);
2561         free(proc);
2562 }
2563
2564 static int
2565 hashval(char *p, int len)
2566 {
2567         int i, hv = 0xABC3D20F;
2568
2569         for (i = 0; i < len; ++i, ++p)
2570                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2571         hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2572         return hv;
2573 }