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], 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 (pipe2(signalpipe, O_CLOEXEC) != 0) {
 543                 syslog(LOG_ERR, "pipe: %m");
 544                 exit(EX_OSERR);
 545         }
 546         FD_SET(signalpipe[0], &allsock);
 547 #ifdef SANITY_CHECK
 548         nsock++;
 549 #endif
 550         if (signalpipe[0] > maxsock)
 551             maxsock = signalpipe[0];
 552         if (signalpipe[1] > maxsock)
 553             maxsock = signalpipe[1];
 554
 555         for (;;) {
 556             int n, ctrl;
 557             fd_set readable;
 558
 559 #ifdef SANITY_CHECK
 560             if (nsock == 0) {
 561                 syslog(LOG_ERR, "%s: nsock=0", __func__);
 562                 exit(EX_SOFTWARE);
 563             }
 564 #endif
 565             readable = allsock;
 566             if ((n = select(maxsock + 1, &readable, (fd_set *)0,
 567                 (fd_set *)0, (struct timeval *)0)) <= 0) {
 568                     if (n < 0 && errno != EINTR) {
 569                         syslog(LOG_WARNING, "select: %m");
 570                         sleep(1);
 571                     }
 572                     continue;
 573             }
 574             /* handle any queued signal flags */
 575             if (FD_ISSET(signalpipe[0], &readable)) {
 576                 int nsig;
 577                 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
 578                     syslog(LOG_ERR, "ioctl: %m");
 579                     exit(EX_OSERR);
 580                 }
 581                 while (--nsig >= 0) {
 582                     char c;
 583                     if (read(signalpipe[0], &c, 1) != 1) {
 584                         syslog(LOG_ERR, "read: %m");
 585                         exit(EX_OSERR);
 586                     }
 587                     if (debug)
 588                         warnx("handling signal flag %c", c);
 589                     switch(c) {
 590                     case 'A': /* sigalrm */
 591                         retry();
 592                         break;
 593                     case 'C': /* sigchld */
 594                         reapchild();
 595                         break;
 596                     case 'H': /* sighup */
 597                         config();
 598                         break;
 599                     }
 600                 }
 601             }
 602             for (sep = servtab; n && sep; sep = sep->se_next)
 603                 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
 604                     n--;
 605                     if (debug)
 606                             warnx("someone wants %s", sep->se_service);
 607                     dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
 608                     conn = NULL;
 609                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
 610                             i = 1;
 611                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 612                                     syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
 613                             ctrl = accept(sep->se_fd, (struct sockaddr *)0,
 614                                 (socklen_t *)0);
 615                             if (debug)
 616                                     warnx("accept, ctrl %d", ctrl);
 617                             if (ctrl < 0) {
 618                                     if (errno != EINTR)
 619                                             syslog(LOG_WARNING,
 620                                                 "accept (for %s): %m",
 621                                                 sep->se_service);
 622                                       if (sep->se_accept &&
 623                                           sep->se_socktype == SOCK_STREAM)
 624                                               close(ctrl);
 625                                     continue;
 626                             }
 627                             i = 0;
 628                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 629                                     syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
 630                             if (ioctl(ctrl, FIONBIO, &i) < 0)
 631                                     syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
 632                             if (cpmip(sep, ctrl) < 0) {
 633                                 close(ctrl);
 634                                 continue;
 635                             }
 636                             if (dofork &&
 637                                 (conn = search_conn(sep, ctrl)) != NULL &&
 638                                 !room_conn(sep, conn)) {
 639                                 close(ctrl);
 640                                 continue;
 641                             }
 642                     } else
 643                             ctrl = sep->se_fd;
 644                     if (dolog && !ISWRAP(sep)) {
 645                             char pname[NI_MAXHOST] = "unknown";
 646                             socklen_t sl;
 647                             sl = sizeof(peer);
 648                             if (getpeername(ctrl, (struct sockaddr *)
 649                                             &peer, &sl)) {
 650                                     sl = sizeof(peer);
 651                                     if (recvfrom(ctrl, buf, sizeof(buf),
 652                                         MSG_PEEK,
 653                                         (struct sockaddr *)&peer,
 654                                         &sl) >= 0) {
 655                                       getnameinfo((struct sockaddr *)&peer,
 656                                                   peer.ss_len,
 657                                                   pname, sizeof(pname),
 658                                                   NULL, 0, NI_NUMERICHOST);
 659                                     }
 660                             } else {
 661                                     getnameinfo((struct sockaddr *)&peer,
 662                                                 peer.ss_len,
 663                                                 pname, sizeof(pname),
 664                                                 NULL, 0, NI_NUMERICHOST);
 665                             }
 666                             syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
 667                     }
 668                     (void) sigblock(SIGBLOCK);
 669                     pid = 0;
 670                     /*
 671                      * Fork for all external services, builtins which need to
 672                      * fork and anything we're wrapping (as wrapping might
 673                      * block or use hosts_options(5) twist).
 674                      */
 675                     if (dofork) {
 676                             if (sep->se_count++ == 0)
 677                                 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time);
 678                             else if (toomany > 0 && sep->se_count >= toomany) {
 679                                 struct timespec now;
 680
 681                                 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 682                                 if (now.tv_sec - sep->se_time.tv_sec >
 683                                     CNT_INTVL) {
 684                                         sep->se_time = now;
 685                                         sep->se_count = 1;
 686                                 } else {
 687                                         syslog(LOG_ERR,
 688                         "%s/%s server failing (looping), service terminated",
 689                                             sep->se_service, sep->se_proto);
 690                                         if (sep->se_accept &&
 691                                             sep->se_socktype == SOCK_STREAM)
 692                                                 close(ctrl);
 693                                         close_sep(sep);
 694                                         free_conn(conn);
 695                                         sigsetmask(0L);
 696                                         if (!timingout) {
 697                                                 timingout = 1;
 698                                                 alarm(RETRYTIME);
 699                                         }
 700                                         continue;
 701                                 }
 702                             }
 703                             pid = fork();
 704                     }
 705                     if (pid < 0) {
 706                             syslog(LOG_ERR, "fork: %m");
 707                             if (sep->se_accept &&
 708                                 sep->se_socktype == SOCK_STREAM)
 709                                     close(ctrl);
 710                             free_conn(conn);
 711                             sigsetmask(0L);
 712                             sleep(1);
 713                             continue;
 714                     }
 715                     if (pid) {
 716                         addchild_conn(conn, pid);
 717                         addchild(sep, pid);
 718                     }
 719                     sigsetmask(0L);
 720                     if (pid == 0) {
 721                             pidfile_close(pfh);
 722                             if (dofork) {
 723                                 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
 724                                 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
 725                                 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
 726                                 /* SIGPIPE reset before exec */
 727                             }
 728                             /*
 729                              * Call tcpmux to find the real service to exec.
 730                              */
 731                             if (sep->se_bi &&
 732                                 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
 733                                     sep = tcpmux(ctrl);
 734                                     if (sep == NULL) {
 735                                             close(ctrl);
 736                                             _exit(0);
 737                                     }
 738                             }
 739                             if (ISWRAP(sep)) {
 740                                 inetd_setproctitle("wrapping", ctrl);
 741                                 service = sep->se_server_name ?
 742                                     sep->se_server_name : sep->se_service;
 743                                 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0);
 744                                 fromhost(&req);
 745                                 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
 746                                 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
 747                                 denied = !hosts_access(&req);
 748                                 if (denied) {
 749                                     syslog(deny_severity,
 750                                         "refused connection from %.500s, service %s (%s%s)",
 751                                         eval_client(&req), service, sep->se_proto,
 752                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 753                                     if (sep->se_socktype != SOCK_STREAM)
 754                                         recv(ctrl, buf, sizeof (buf), 0);
 755                                     if (dofork) {
 756                                         sleep(1);
 757                                         _exit(0);
 758                                     }
 759                                 }
 760                                 if (dolog) {
 761                                     syslog(allow_severity,
 762                                         "connection from %.500s, service %s (%s%s)",
 763                                         eval_client(&req), service, sep->se_proto,
 764                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 765                                 }
 766                             }
 767                             if (sep->se_bi) {
 768                                 (*sep->se_bi->bi_fn)(ctrl, sep);
 769                             } else {
 770                                 if (debug)
 771                                         warnx("%d execl %s",
 772                                                 getpid(), sep->se_server);
 773                                 /* Clear close-on-exec. */
 774                                 if (fcntl(ctrl, F_SETFD, 0) < 0) {
 775                                         syslog(LOG_ERR,
 776                                             "%s/%s: fcntl (F_SETFD, 0): %m",
 777                                                 sep->se_service, sep->se_proto);
 778                                         _exit(EX_OSERR);
 779                                 }
 780                                 if (ctrl != 0) {
 781                                         dup2(ctrl, 0);
 782                                         close(ctrl);
 783                                 }
 784                                 dup2(0, 1);
 785                                 dup2(0, 2);
 786                                 if ((pwd = getpwnam(sep->se_user)) == NULL) {
 787                                         syslog(LOG_ERR,
 788                                             "%s/%s: %s: no such user",
 789                                                 sep->se_service, sep->se_proto,
 790                                                 sep->se_user);
 791                                         if (sep->se_socktype != SOCK_STREAM)
 792                                                 recv(0, buf, sizeof (buf), 0);
 793                                         _exit(EX_NOUSER);
 794                                 }
 795                                 grp = NULL;
 796                                 if (   sep->se_group != NULL
 797                                     && (grp = getgrnam(sep->se_group)) == NULL
 798                                    ) {
 799                                         syslog(LOG_ERR,
 800                                             "%s/%s: %s: no such group",
 801                                                 sep->se_service, sep->se_proto,
 802                                                 sep->se_group);
 803                                         if (sep->se_socktype != SOCK_STREAM)
 804                                                 recv(0, buf, sizeof (buf), 0);
 805                                         _exit(EX_NOUSER);
 806                                 }
 807                                 if (grp != NULL)
 808                                         pwd->pw_gid = grp->gr_gid;
 809 #ifdef LOGIN_CAP
 810                                 if ((lc = login_getclass(sep->se_class)) == NULL) {
 811                                         /* error syslogged by getclass */
 812                                         syslog(LOG_ERR,
 813                                             "%s/%s: %s: login class error",
 814                                                 sep->se_service, sep->se_proto,
 815                                                 sep->se_class);
 816                                         if (sep->se_socktype != SOCK_STREAM)
 817                                                 recv(0, buf, sizeof (buf), 0);
 818                                         _exit(EX_NOUSER);
 819                                 }
 820 #endif
 821                                 if (setsid() < 0) {
 822                                         syslog(LOG_ERR,
 823                                                 "%s: can't setsid(): %m",
 824                                                  sep->se_service);
 825                                         /* _exit(EX_OSERR); not fatal yet */
 826                                 }
 827 #ifdef LOGIN_CAP
 828                                 if (setusercontext(lc, pwd, pwd->pw_uid,
 829                                     LOGIN_SETALL & ~LOGIN_SETMAC)
 830                                     != 0) {
 831                                         syslog(LOG_ERR,
 832                                          "%s: can't setusercontext(..%s..): %m",
 833                                          sep->se_service, sep->se_user);
 834                                         _exit(EX_OSERR);
 835                                 }
 836                                 login_close(lc);
 837 #else
 838                                 if (pwd->pw_uid) {
 839                                         if (setlogin(sep->se_user) < 0) {
 840                                                 syslog(LOG_ERR,
 841                                                  "%s: can't setlogin(%s): %m",
 842                                                  sep->se_service, sep->se_user);
 843                                                 /* _exit(EX_OSERR); not yet */
 844                                         }
 845                                         if (setgid(pwd->pw_gid) < 0) {
 846                                                 syslog(LOG_ERR,
 847                                                   "%s: can't set gid %d: %m",
 848                                                   sep->se_service, pwd->pw_gid);
 849                                                 _exit(EX_OSERR);
 850                                         }
 851                                         (void) initgroups(pwd->pw_name,
 852                                                         pwd->pw_gid);
 853                                         if (setuid(pwd->pw_uid) < 0) {
 854                                                 syslog(LOG_ERR,
 855                                                   "%s: can't set uid %d: %m",
 856                                                   sep->se_service, pwd->pw_uid);
 857                                                 _exit(EX_OSERR);
 858                                         }
 859                                 }
 860 #endif
 861                                 sigaction(SIGPIPE, &sapipe,
 862                                     (struct sigaction *)0);
 863                                 execv(sep->se_server, sep->se_argv);
 864                                 syslog(LOG_ERR,
 865                                     "cannot execute %s: %m", sep->se_server);
 866                                 if (sep->se_socktype != SOCK_STREAM)
 867                                         recv(0, buf, sizeof (buf), 0);
 868                             }
 869                             if (dofork)
 870                                 _exit(0);
 871                     }
 872                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
 873                             close(ctrl);
 874                 }
 875         }
 876 }
 877
 878 /*
 879  * Add a signal flag to the signal flag queue for later handling
 880  */
 881
 882 void
 883 flag_signal(int c)
 884 {
 885         char ch = c;
 886
 887         if (write(signalpipe[1], &ch, 1) != 1) {
 888                 syslog(LOG_ERR, "write: %m");
 889                 _exit(EX_OSERR);
 890         }
 891 }
 892
 893 /*
 894  * Record a new child pid for this service. If we've reached the
 895  * limit on children, then stop accepting incoming requests.
 896  */
 897
 898 void
 899 addchild(struct servtab *sep, pid_t pid)
 900 {
 901         if (sep->se_maxchild <= 0)
 902                 return;
 903 #ifdef SANITY_CHECK
 904         if (sep->se_numchild >= sep->se_maxchild) {
 905                 syslog(LOG_ERR, "%s: %d >= %d",
 906                     __func__, sep->se_numchild, sep->se_maxchild);
 907                 exit(EX_SOFTWARE);
 908         }
 909 #endif
 910         sep->se_pids[sep->se_numchild++] = pid;
 911         if (sep->se_numchild == sep->se_maxchild)
 912                 disable(sep);
 913 }
 914
 915 /*
 916  * Some child process has exited. See if it's on somebody's list.
 917  */
 918
 919 void
 920 flag_reapchild(int signo __unused)
 921 {
 922         flag_signal('C');
 923 }
 924
 925 void
 926 reapchild(void)
 927 {
 928         int k, status;
 929         pid_t pid;
 930         struct servtab *sep;
 931
 932         for (;;) {
 933                 pid = wait3(&status, WNOHANG, (struct rusage *)0);
 934                 if (pid <= 0)
 935                         break;
 936                 if (debug)
 937                         warnx("%d reaped, %s %u", pid,
 938                             WIFEXITED(status) ? "status" : "signal",
 939                             WIFEXITED(status) ? WEXITSTATUS(status)
 940                                 : WTERMSIG(status));
 941                 for (sep = servtab; sep; sep = sep->se_next) {
 942                         for (k = 0; k < sep->se_numchild; k++)
 943                                 if (sep->se_pids[k] == pid)
 944                                         break;
 945                         if (k == sep->se_numchild)
 946                                 continue;
 947                         if (sep->se_numchild == sep->se_maxchild)
 948                                 enable(sep);
 949                         sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
 950                         if (WIFSIGNALED(status) || WEXITSTATUS(status))
 951                                 syslog(LOG_WARNING,
 952                                     "%s[%d]: exited, %s %u",
 953                                     sep->se_server, pid,
 954                                     WIFEXITED(status) ? "status" : "signal",
 955                                     WIFEXITED(status) ? WEXITSTATUS(status)
 956                                         : WTERMSIG(status));
 957                         break;
 958                 }
 959                 reapchild_conn(pid);
 960         }
 961 }
 962
 963 void
 964 flag_config(int signo __unused)
 965 {
 966         flag_signal('H');
 967 }
 968
 969 void
 970 config(void)
 971 {
 972         struct servtab *sep, *new, **sepp;
 973         long omask;
 974         int new_nomapped;
 975 #ifdef LOGIN_CAP
 976         login_cap_t *lc = NULL;
 977 #endif
 978
 979         if (!setconfig()) {
 980                 syslog(LOG_ERR, "%s: %m", CONFIG);
 981                 return;
 982         }
 983         for (sep = servtab; sep; sep = sep->se_next)
 984                 sep->se_checked = 0;
 985         while ((new = getconfigent())) {
 986                 if (getpwnam(new->se_user) == NULL) {
 987                         syslog(LOG_ERR,
 988                                 "%s/%s: no such user '%s', service ignored",
 989                                 new->se_service, new->se_proto, new->se_user);
 990                         continue;
 991                 }
 992                 if (new->se_group && getgrnam(new->se_group) == NULL) {
 993                         syslog(LOG_ERR,
 994                                 "%s/%s: no such group '%s', service ignored",
 995                                 new->se_service, new->se_proto, new->se_group);
 996                         continue;
 997                 }
 998 #ifdef LOGIN_CAP
 999                 if ((lc = login_getclass(new->se_class)) == NULL) {
1000                         /* error syslogged by getclass */
1001                         syslog(LOG_ERR,
1002                                 "%s/%s: %s: login class error, service ignored",
1003                                 new->se_service, new->se_proto, new->se_class);
1004                         continue;
1005                 }
1006                 login_close(lc);
1007 #endif
1008                 new_nomapped = new->se_nomapped;
1009                 for (sep = servtab; sep; sep = sep->se_next)
1010                         if (strcmp(sep->se_service, new->se_service) == 0 &&
1011                             strcmp(sep->se_proto, new->se_proto) == 0 &&
1012                             sep->se_rpc == new->se_rpc &&
1013                             sep->se_socktype == new->se_socktype &&
1014                             sep->se_family == new->se_family)
1015                                 break;
1016                 if (sep != 0) {
1017                         int i;
1018
1019 #define SWAP(t,a, b) { t c = a; a = b; b = c; }
1020                         omask = sigblock(SIGBLOCK);
1021                         if (sep->se_nomapped != new->se_nomapped) {
1022                                 /* for rpc keep old nommaped till unregister */
1023                                 if (!sep->se_rpc)
1024                                         sep->se_nomapped = new->se_nomapped;
1025                                 sep->se_reset = 1;
1026                         }
1027                         /* copy over outstanding child pids */
1028                         if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
1029                                 new->se_numchild = sep->se_numchild;
1030                                 if (new->se_numchild > new->se_maxchild)
1031                                         new->se_numchild = new->se_maxchild;
1032                                 memcpy(new->se_pids, sep->se_pids,
1033                                     new->se_numchild * sizeof(*new->se_pids));
1034                         }
1035                         SWAP(pid_t *, sep->se_pids, new->se_pids);
1036                         sep->se_maxchild = new->se_maxchild;
1037                         sep->se_numchild = new->se_numchild;
1038                         sep->se_maxcpm = new->se_maxcpm;
1039                         resize_conn(sep, new->se_maxperip);
1040                         sep->se_maxperip = new->se_maxperip;
1041                         sep->se_bi = new->se_bi;
1042                         /* might need to turn on or off service now */
1043                         if (sep->se_fd >= 0) {
1044                               if (sep->se_maxchild > 0
1045                                   && sep->se_numchild == sep->se_maxchild) {
1046                                       if (FD_ISSET(sep->se_fd, &allsock))
1047                                           disable(sep);
1048                               } else {
1049                                       if (!FD_ISSET(sep->se_fd, &allsock))
1050                                           enable(sep);
1051                               }
1052                         }
1053                         sep->se_accept = new->se_accept;
1054                         SWAP(char *, sep->se_user, new->se_user);
1055                         SWAP(char *, sep->se_group, new->se_group);
1056 #ifdef LOGIN_CAP
1057                         SWAP(char *, sep->se_class, new->se_class);
1058 #endif
1059                         SWAP(char *, sep->se_server, new->se_server);
1060                         SWAP(char *, sep->se_server_name, new->se_server_name);
1061                         for (i = 0; i < MAXARGV; i++)
1062                                 SWAP(char *, sep->se_argv[i], new->se_argv[i]);
1063 #ifdef IPSEC
1064                         SWAP(char *, sep->se_policy, new->se_policy);
1065                         ipsecsetup(sep);
1066 #endif
1067                         sigsetmask(omask);
1068                         freeconfig(new);
1069                         if (debug)
1070                                 print_service("REDO", sep);
1071                 } else {
1072                         sep = enter(new);
1073                         if (debug)
1074                                 print_service("ADD ", sep);
1075                 }
1076                 sep->se_checked = 1;
1077                 if (ISMUX(sep)) {
1078                         sep->se_fd = -1;
1079                         continue;
1080                 }
1081                 switch (sep->se_family) {
1082                 case AF_INET:
1083                         if (!v4bind_ok) {
1084                                 sep->se_fd = -1;
1085                                 continue;
1086                         }
1087                         break;
1088 #ifdef INET6
1089                 case AF_INET6:
1090                         if (!v6bind_ok) {
1091                                 sep->se_fd = -1;
1092                                 continue;
1093                         }
1094                         break;
1095 #endif
1096                 }
1097                 if (!sep->se_rpc) {
1098                         if (sep->se_family != AF_UNIX) {
1099                                 sp = getservbyname(sep->se_service, sep->se_proto);
1100                                 if (sp == 0) {
1101                                         syslog(LOG_ERR, "%s/%s: unknown service",
1102                                         sep->se_service, sep->se_proto);
1103                                         sep->se_checked = 0;
1104                                         continue;
1105                                 }
1106                         }
1107                         switch (sep->se_family) {
1108                         case AF_INET:
1109                                 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1110                                         sep->se_ctrladdr4.sin_port =
1111                                                 sp->s_port;
1112                                         sep->se_reset = 1;
1113                                 }
1114                                 break;
1115 #ifdef INET6
1116                         case AF_INET6:
1117                                 if (sp->s_port !=
1118                                     sep->se_ctrladdr6.sin6_port) {
1119                                         sep->se_ctrladdr6.sin6_port =
1120                                                 sp->s_port;
1121                                         sep->se_reset = 1;
1122                                 }
1123                                 break;
1124 #endif
1125                         }
1126                         if (sep->se_reset != 0 && sep->se_fd >= 0)
1127                                 close_sep(sep);
1128                 } else {
1129                         rpc = getrpcbyname(sep->se_service);
1130                         if (rpc == 0) {
1131                                 syslog(LOG_ERR, "%s/%s unknown RPC service",
1132                                         sep->se_service, sep->se_proto);
1133                                 if (sep->se_fd != -1)
1134                                         (void) close(sep->se_fd);
1135                                 sep->se_fd = -1;
1136                                         continue;
1137                         }
1138                         if (sep->se_reset != 0 ||
1139                             rpc->r_number != sep->se_rpc_prog) {
1140                                 if (sep->se_rpc_prog)
1141                                         unregisterrpc(sep);
1142                                 sep->se_rpc_prog = rpc->r_number;
1143                                 if (sep->se_fd != -1)
1144                                         (void) close(sep->se_fd);
1145                                 sep->se_fd = -1;
1146                         }
1147                         sep->se_nomapped = new_nomapped;
1148                 }
1149                 sep->se_reset = 0;
1150                 if (sep->se_fd == -1)
1151                         setup(sep);
1152         }
1153         endconfig();
1154         /*
1155          * Purge anything not looked at above.
1156          */
1157         omask = sigblock(SIGBLOCK);
1158         sepp = &servtab;
1159         while ((sep = *sepp)) {
1160                 if (sep->se_checked) {
1161                         sepp = &sep->se_next;
1162                         continue;
1163                 }
1164                 *sepp = sep->se_next;
1165                 if (sep->se_fd >= 0)
1166                         close_sep(sep);
1167                 if (debug)
1168                         print_service("FREE", sep);
1169                 if (sep->se_rpc && sep->se_rpc_prog > 0)
1170                         unregisterrpc(sep);
1171                 freeconfig(sep);
1172                 free(sep);
1173         }
1174         (void) sigsetmask(omask);
1175 }
1176
1177 void
1178 unregisterrpc(struct servtab *sep)
1179 {
1180         u_int i;
1181         struct servtab *sepp;
1182         long omask;
1183         struct netconfig *netid4, *netid6;
1184
1185         omask = sigblock(SIGBLOCK);
1186         netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf;
1187         netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf;
1188         if (sep->se_family == AF_INET)
1189                 netid6 = NULL;
1190         else if (sep->se_nomapped)
1191                 netid4 = NULL;
1192         /*
1193          * Conflict if same prog and protocol - In that case one should look
1194          * to versions, but it is not interesting: having separate servers for
1195          * different versions does not work well.
1196          * Therefore one do not unregister if there is a conflict.
1197          * There is also transport conflict if destroying INET when INET46
1198          * exists, or destroying INET46 when INET exists
1199          */
1200         for (sepp = servtab; sepp; sepp = sepp->se_next) {
1201                 if (sepp == sep)
1202                         continue;
1203                 if (sepp->se_checked == 0 ||
1204                     !sepp->se_rpc ||
1205                     strcmp(sep->se_proto, sepp->se_proto) != 0 ||
1206                     sep->se_rpc_prog != sepp->se_rpc_prog)
1207                         continue;
1208                 if (sepp->se_family == AF_INET)
1209                         netid4 = NULL;
1210                 if (sepp->se_family == AF_INET6) {
1211                         netid6 = NULL;
1212                         if (!sep->se_nomapped)
1213                                 netid4 = NULL;
1214                 }
1215                 if (netid4 == NULL && netid6 == NULL)
1216                         return;
1217         }
1218         if (debug)
1219                 print_service("UNREG", sep);
1220         for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1221                 if (netid4)
1222                         rpcb_unset(sep->se_rpc_prog, i, netid4);
1223                 if (netid6)
1224                         rpcb_unset(sep->se_rpc_prog, i, netid6);
1225         }
1226         if (sep->se_fd != -1)
1227                 (void) close(sep->se_fd);
1228         sep->se_fd = -1;
1229         (void) sigsetmask(omask);
1230 }
1231
1232 void
1233 flag_retry(int signo __unused)
1234 {
1235         flag_signal('A');
1236 }
1237
1238 void
1239 retry(void)
1240 {
1241         struct servtab *sep;
1242
1243         timingout = 0;
1244         for (sep = servtab; sep; sep = sep->se_next)
1245                 if (sep->se_fd == -1 && !ISMUX(sep))
1246                         setup(sep);
1247 }
1248
1249 void
1250 setup(struct servtab *sep)
1251 {
1252         int on = 1;
1253
1254         /* Set all listening sockets to close-on-exec. */
1255         if ((sep->se_fd = socket(sep->se_family,
1256             sep->se_socktype | SOCK_CLOEXEC, 0)) < 0) {
1257                 if (debug)
1258                         warn("socket failed on %s/%s",
1259                                 sep->se_service, sep->se_proto);
1260                 syslog(LOG_ERR, "%s/%s: socket: %m",
1261                     sep->se_service, sep->se_proto);
1262                 return;
1263         }
1264 #define turnon(fd, opt) \
1265 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1266         if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1267             turnon(sep->se_fd, SO_DEBUG) < 0)
1268                 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1269         if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1270                 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1271 #ifdef SO_PRIVSTATE
1272         if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1273                 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1274 #endif
1275         /* tftpd opens a new connection then needs more infos */
1276         if ((sep->se_family == AF_INET6) &&
1277             (strcmp(sep->se_proto, "udp") == 0) &&
1278             (sep->se_accept == 0) &&
1279             (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
1280                         (char *)&on, sizeof (on)) < 0))
1281                 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1282         if (sep->se_family == AF_INET6) {
1283                 int flag = sep->se_nomapped ? 1 : 0;
1284                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1285                                (char *)&flag, sizeof (flag)) < 0)
1286                         syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1287         }
1288 #undef turnon
1289 #ifdef IPSEC
1290         ipsecsetup(sep);
1291 #endif
1292         if (sep->se_family == AF_UNIX) {
1293                 (void) unlink(sep->se_ctrladdr_un.sun_path);
1294                 umask(0777); /* Make socket with conservative permissions */
1295         }
1296         if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1297             sep->se_ctrladdr_size) < 0) {
1298                 if (debug)
1299                         warn("bind failed on %s/%s",
1300                                 sep->se_service, sep->se_proto);
1301                 syslog(LOG_ERR, "%s/%s: bind: %m",
1302                     sep->se_service, sep->se_proto);
1303                 (void) close(sep->se_fd);
1304                 sep->se_fd = -1;
1305                 if (!timingout) {
1306                         timingout = 1;
1307                         alarm(RETRYTIME);
1308                 }
1309                 if (sep->se_family == AF_UNIX)
1310                         umask(mask);
1311                 return;
1312         }
1313         if (sep->se_family == AF_UNIX) {
1314                 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1315                 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1316                         syslog(LOG_ERR, "chown socket: %m");
1317                 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1318                         syslog(LOG_ERR, "chmod socket: %m");
1319                 umask(mask);
1320         }
1321         if (sep->se_rpc) {
1322                 u_int i;
1323                 socklen_t len = sep->se_ctrladdr_size;
1324                 struct netconfig *netid, *netid2 = NULL;
1325                 struct sockaddr_in sock;
1326                 struct netbuf nbuf, nbuf2;
1327
1328                 if (getsockname(sep->se_fd,
1329                                 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1330                         syslog(LOG_ERR, "%s/%s: getsockname: %m",
1331                                sep->se_service, sep->se_proto);
1332                         (void) close(sep->se_fd);
1333                         sep->se_fd = -1;
1334                         return;
1335                 }
1336                 nbuf.buf = &sep->se_ctrladdr;
1337                 nbuf.len = sep->se_ctrladdr.sa_len;
1338                 if (sep->se_family == AF_INET)
1339                         netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf;
1340                 else  {
1341                         netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf;
1342                         if (!sep->se_nomapped) { /* INET and INET6 */
1343                                 netid2 = netid==udp6conf? udpconf:tcpconf;
1344                                 memset(&sock, 0, sizeof sock);  /* ADDR_ANY */
1345                                 nbuf2.buf = &sock;
1346                                 nbuf2.len = sock.sin_len = sizeof sock;
1347                                 sock.sin_family = AF_INET;
1348                                 sock.sin_port = sep->se_ctrladdr6.sin6_port;
1349                         }
1350                 }
1351                 if (debug)
1352                         print_service("REG ", sep);
1353                 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1354                         rpcb_unset(sep->se_rpc_prog, i, netid);
1355                         rpcb_set(sep->se_rpc_prog, i, netid, &nbuf);
1356                         if (netid2) {
1357                                 rpcb_unset(sep->se_rpc_prog, i, netid2);
1358                                 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2);
1359                         }
1360                 }
1361         }
1362         if (sep->se_socktype == SOCK_STREAM)
1363                 listen(sep->se_fd, -1);
1364         enable(sep);
1365         if (debug) {
1366                 warnx("registered %s on %d",
1367                         sep->se_server, sep->se_fd);
1368         }
1369 }
1370
1371 #ifdef IPSEC
1372 void
1373 ipsecsetup(struct servtab *sep)
1374 {
1375         char *buf;
1376         char *policy_in = NULL;
1377         char *policy_out = NULL;
1378         int level;
1379         int opt;
1380
1381         switch (sep->se_family) {
1382         case AF_INET:
1383                 level = IPPROTO_IP;
1384                 opt = IP_IPSEC_POLICY;
1385                 break;
1386 #ifdef INET6
1387         case AF_INET6:
1388                 level = IPPROTO_IPV6;
1389                 opt = IPV6_IPSEC_POLICY;
1390                 break;
1391 #endif
1392         default:
1393                 return;
1394         }
1395
1396         if (!sep->se_policy || sep->se_policy[0] == '\0') {
1397                 static char def_in[] = "in entrust", def_out[] = "out entrust";
1398                 policy_in = def_in;
1399                 policy_out = def_out;
1400         } else {
1401                 if (!strncmp("in", sep->se_policy, 2))
1402                         policy_in = sep->se_policy;
1403                 else if (!strncmp("out", sep->se_policy, 3))
1404                         policy_out = sep->se_policy;
1405                 else {
1406                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1407                                 sep->se_policy);
1408                         return;
1409                 }
1410         }
1411
1412         if (policy_in != NULL) {
1413                 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1414                 if (buf != NULL) {
1415                         if (setsockopt(sep->se_fd, level, opt,
1416                                         buf, ipsec_get_policylen(buf)) < 0 &&
1417                             debug != 0)
1418                                 warnx("%s/%s: ipsec initialization failed; %s",
1419                                       sep->se_service, sep->se_proto,
1420                                       policy_in);
1421                         free(buf);
1422                 } else
1423                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1424                                 policy_in);
1425         }
1426         if (policy_out != NULL) {
1427                 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1428                 if (buf != NULL) {
1429                         if (setsockopt(sep->se_fd, level, opt,
1430                                         buf, ipsec_get_policylen(buf)) < 0 &&
1431                             debug != 0)
1432                                 warnx("%s/%s: ipsec initialization failed; %s",
1433                                       sep->se_service, sep->se_proto,
1434                                       policy_out);
1435                         free(buf);
1436                 } else
1437                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1438                                 policy_out);
1439         }
1440 }
1441 #endif
1442
1443 /*
1444  * Finish with a service and its socket.
1445  */
1446 void
1447 close_sep(struct servtab *sep)
1448 {
1449         if (sep->se_fd >= 0) {
1450                 if (FD_ISSET(sep->se_fd, &allsock))
1451                         disable(sep);
1452                 (void) close(sep->se_fd);
1453                 sep->se_fd = -1;
1454         }
1455         sep->se_count = 0;
1456         sep->se_numchild = 0;   /* forget about any existing children */
1457 }
1458
1459 int
1460 matchservent(const char *name1, const char *name2, const char *proto)
1461 {
1462         char **alias, *p;
1463         struct servent *se;
1464
1465         if (strcmp(proto, "unix") == 0) {
1466                 if ((p = strrchr(name1, '/')) != NULL)
1467                         name1 = p + 1;
1468                 if ((p = strrchr(name2, '/')) != NULL)
1469                         name2 = p + 1;
1470         }
1471         if (strcmp(name1, name2) == 0)
1472                 return(1);
1473         if ((se = getservbyname(name1, proto)) != NULL) {
1474                 if (strcmp(name2, se->s_name) == 0)
1475                         return(1);
1476                 for (alias = se->s_aliases; *alias; alias++)
1477                         if (strcmp(name2, *alias) == 0)
1478                                 return(1);
1479         }
1480         return(0);
1481 }
1482
1483 struct servtab *
1484 enter(struct servtab *cp)
1485 {
1486         struct servtab *sep;
1487         long omask;
1488
1489         sep = (struct servtab *)malloc(sizeof (*sep));
1490         if (sep == (struct servtab *)0) {
1491                 syslog(LOG_ERR, "malloc: %m");
1492                 exit(EX_OSERR);
1493         }
1494         *sep = *cp;
1495         sep->se_fd = -1;
1496         omask = sigblock(SIGBLOCK);
1497         sep->se_next = servtab;
1498         servtab = sep;
1499         sigsetmask(omask);
1500         return (sep);
1501 }
1502
1503 void
1504 enable(struct servtab *sep)
1505 {
1506         if (debug)
1507                 warnx(
1508                     "enabling %s, fd %d", sep->se_service, sep->se_fd);
1509 #ifdef SANITY_CHECK
1510         if (sep->se_fd < 0) {
1511                 syslog(LOG_ERR,
1512                     "%s: %s: bad fd", __func__, sep->se_service);
1513                 exit(EX_SOFTWARE);
1514         }
1515         if (ISMUX(sep)) {
1516                 syslog(LOG_ERR,
1517                     "%s: %s: is mux", __func__, sep->se_service);
1518                 exit(EX_SOFTWARE);
1519         }
1520         if (FD_ISSET(sep->se_fd, &allsock)) {
1521                 syslog(LOG_ERR,
1522                     "%s: %s: not off", __func__, sep->se_service);
1523                 exit(EX_SOFTWARE);
1524         }
1525         nsock++;
1526 #endif
1527         FD_SET(sep->se_fd, &allsock);
1528         if (sep->se_fd > maxsock)
1529                 maxsock = sep->se_fd;
1530 }
1531
1532 void
1533 disable(struct servtab *sep)
1534 {
1535         if (debug)
1536                 warnx(
1537                     "disabling %s, fd %d", sep->se_service, sep->se_fd);
1538 #ifdef SANITY_CHECK
1539         if (sep->se_fd < 0) {
1540                 syslog(LOG_ERR,
1541                     "%s: %s: bad fd", __func__, sep->se_service);
1542                 exit(EX_SOFTWARE);
1543         }
1544         if (ISMUX(sep)) {
1545                 syslog(LOG_ERR,
1546                     "%s: %s: is mux", __func__, sep->se_service);
1547                 exit(EX_SOFTWARE);
1548         }
1549         if (!FD_ISSET(sep->se_fd, &allsock)) {
1550                 syslog(LOG_ERR,
1551                     "%s: %s: not on", __func__, sep->se_service);
1552                 exit(EX_SOFTWARE);
1553         }
1554         if (nsock == 0) {
1555                 syslog(LOG_ERR, "%s: nsock=0", __func__);
1556                 exit(EX_SOFTWARE);
1557         }
1558         nsock--;
1559 #endif
1560         FD_CLR(sep->se_fd, &allsock);
1561         if (sep->se_fd == maxsock)
1562                 maxsock--;
1563 }
1564
1565 FILE    *fconfig = NULL;
1566 struct  servtab serv;
1567 char    line[LINE_MAX];
1568
1569 int
1570 setconfig(void)
1571 {
1572
1573         if (fconfig != NULL) {
1574                 fseek(fconfig, 0L, SEEK_SET);
1575                 return (1);
1576         }
1577         fconfig = fopen(CONFIG, "r");
1578         return (fconfig != NULL);
1579 }
1580
1581 void
1582 endconfig(void)
1583 {
1584         if (fconfig) {
1585                 (void) fclose(fconfig);
1586                 fconfig = NULL;
1587         }
1588 }
1589
1590 struct servtab *
1591 getconfigent(void)
1592 {
1593         struct servtab *sep = &serv;
1594         int argc;
1595         char *cp, *arg, *s;
1596         char *versp;
1597         static char TCPMUX_TOKEN[] = "tcpmux/";
1598 #define MUX_LEN         (sizeof(TCPMUX_TOKEN)-1)
1599 #ifdef IPSEC
1600         char *policy;
1601 #endif
1602         int v4bind;
1603 #ifdef INET6
1604         int v6bind;
1605 #endif
1606         int i;
1607
1608 #ifdef IPSEC
1609         policy = NULL;
1610 #endif
1611 more:
1612         v4bind = 0;
1613 #ifdef INET6
1614         v6bind = 0;
1615 #endif
1616         while ((cp = nextline(fconfig)) != NULL) {
1617 #ifdef IPSEC
1618                 /* lines starting with #@ is not a comment, but the policy */
1619                 if (cp[0] == '#' && cp[1] == '@') {
1620                         char *p;
1621                         for (p = cp + 2; p && *p && isspace(*p); p++)
1622                                 ;
1623                         if (*p == '\0') {
1624                                 if (policy)
1625                                         free(policy);
1626                                 policy = NULL;
1627                         } else if (ipsec_get_policylen(p) >= 0) {
1628                                 if (policy)
1629                                         free(policy);
1630                                 policy = newstr(p);
1631                         } else {
1632                                 syslog(LOG_ERR,
1633                                         "%s: invalid ipsec policy \"%s\"",
1634                                         CONFIG, p);
1635                                 exit(EX_CONFIG);
1636                         }
1637                 }
1638 #endif
1639                 if (*cp == '#' || *cp == '\0')
1640                         continue;
1641                 break;
1642         }
1643         if (cp == NULL)
1644                 return ((struct servtab *)0);
1645         /*
1646          * clear the static buffer, since some fields (se_ctrladdr,
1647          * for example) don't get initialized here.
1648          */
1649         memset(sep, 0, sizeof *sep);
1650         arg = skip(&cp);
1651         if (cp == NULL) {
1652                 /* got an empty line containing just blanks/tabs. */
1653                 goto more;
1654         }
1655         if (arg[0] == ':') { /* :user:group:perm: */
1656                 char *user, *group, *perm;
1657                 struct passwd *pw;
1658                 struct group *gr;
1659                 user = arg+1;
1660                 if ((group = strchr(user, ':')) == NULL) {
1661                         syslog(LOG_ERR, "no group after user '%s'", user);
1662                         goto more;
1663                 }
1664                 *group++ = '\0';
1665                 if ((perm = strchr(group, ':')) == NULL) {
1666                         syslog(LOG_ERR, "no mode after group '%s'", group);
1667                         goto more;
1668                 }
1669                 *perm++ = '\0';
1670                 if ((pw = getpwnam(user)) == NULL) {
1671                         syslog(LOG_ERR, "no such user '%s'", user);
1672                         goto more;
1673                 }
1674                 sep->se_sockuid = pw->pw_uid;
1675                 if ((gr = getgrnam(group)) == NULL) {
1676                         syslog(LOG_ERR, "no such user '%s'", group);
1677                         goto more;
1678                 }
1679                 sep->se_sockgid = gr->gr_gid;
1680                 sep->se_sockmode = strtol(perm, &arg, 8);
1681                 if (*arg != ':') {
1682                         syslog(LOG_ERR, "bad mode '%s'", perm);
1683                         goto more;
1684                 }
1685                 *arg++ = '\0';
1686         } else {
1687                 sep->se_sockuid = euid;
1688                 sep->se_sockgid = egid;
1689                 sep->se_sockmode = 0200;
1690         }
1691         if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1692                 char *c = arg + MUX_LEN;
1693                 if (*c == '+') {
1694                         sep->se_type = MUXPLUS_TYPE;
1695                         c++;
1696                 } else
1697                         sep->se_type = MUX_TYPE;
1698                 sep->se_service = newstr(c);
1699         } else {
1700                 sep->se_service = newstr(arg);
1701                 sep->se_type = NORM_TYPE;
1702         }
1703         arg = sskip(&cp);
1704         if (strcmp(arg, "stream") == 0)
1705                 sep->se_socktype = SOCK_STREAM;
1706         else if (strcmp(arg, "dgram") == 0)
1707                 sep->se_socktype = SOCK_DGRAM;
1708         else if (strcmp(arg, "rdm") == 0)
1709                 sep->se_socktype = SOCK_RDM;
1710         else if (strcmp(arg, "seqpacket") == 0)
1711                 sep->se_socktype = SOCK_SEQPACKET;
1712         else if (strcmp(arg, "raw") == 0)
1713                 sep->se_socktype = SOCK_RAW;
1714         else
1715                 sep->se_socktype = -1;
1716
1717         arg = sskip(&cp);
1718         if (strncmp(arg, "tcp", 3) == 0) {
1719                 sep->se_proto = newstr(strsep(&arg, "/"));
1720                 if (arg != NULL && (strcmp(arg, "faith") == 0)) {
1721                         syslog(LOG_ERR, "faith has been deprecated");
1722                         goto more;
1723                 }
1724         } else {
1725                 if (sep->se_type == NORM_TYPE &&
1726                     strncmp(arg, "faith/", 6) == 0) {
1727                         syslog(LOG_ERR, "faith has been deprecated");
1728                         goto more;
1729                 }
1730                 sep->se_proto = newstr(arg);
1731         }
1732         if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1733                 memmove(sep->se_proto, sep->se_proto + 4,
1734                     strlen(sep->se_proto) + 1 - 4);
1735                 sep->se_rpc = 1;
1736                 sep->se_rpc_prog = sep->se_rpc_lowvers =
1737                         sep->se_rpc_highvers = 0;
1738                 if ((versp = strrchr(sep->se_service, '/'))) {
1739                         *versp++ = '\0';
1740                         switch (sscanf(versp, "%u-%u",
1741                                        &sep->se_rpc_lowvers,
1742                                        &sep->se_rpc_highvers)) {
1743                         case 2:
1744                                 break;
1745                         case 1:
1746                                 sep->se_rpc_highvers =
1747                                         sep->se_rpc_lowvers;
1748                                 break;
1749                         default:
1750                                 syslog(LOG_ERR,
1751                                         "bad RPC version specifier; %s",
1752                                         sep->se_service);
1753                                 freeconfig(sep);
1754                                 goto more;
1755                         }
1756                 }
1757                 else {
1758                         sep->se_rpc_lowvers =
1759                                 sep->se_rpc_highvers = 1;
1760                 }
1761         }
1762         sep->se_nomapped = 0;
1763         if (strcmp(sep->se_proto, "unix") == 0) {
1764                 sep->se_family = AF_UNIX;
1765         } else {
1766                 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1767 #ifdef INET6
1768                         if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1769                                 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1770                                 v6bind = 1;
1771                                 continue;
1772                         }
1773 #endif
1774                         if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1775                                 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1776                                 v4bind = 1;
1777                                 continue;
1778                         }
1779                         /* illegal version num */
1780                         syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1781                         freeconfig(sep);
1782                         goto more;
1783                 }
1784 #ifdef INET6
1785                 if (v6bind && !v6bind_ok) {
1786                         syslog(LOG_INFO, "IPv6 bind is ignored for %s",
1787                                sep->se_service);
1788                         if (v4bind && v4bind_ok)
1789                                 v6bind = 0;
1790                         else {
1791                                 freeconfig(sep);
1792                                 goto more;
1793                         }
1794                 }
1795                 if (v6bind) {
1796                         sep->se_family = AF_INET6;
1797                         if (!v4bind || !v4bind_ok)
1798                                 sep->se_nomapped = 1;
1799                 } else
1800 #endif
1801                 { /* default to v4 bind if not v6 bind */
1802                         if (!v4bind_ok) {
1803                                 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1804                                        sep->se_service);
1805                                 freeconfig(sep);
1806                                 goto more;
1807                         }
1808                         sep->se_family = AF_INET;
1809                 }
1810         }
1811         /* init ctladdr */
1812         switch(sep->se_family) {
1813         case AF_INET:
1814                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1815                        sizeof(sep->se_ctrladdr4));
1816                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1817                 break;
1818 #ifdef INET6
1819         case AF_INET6:
1820                 memcpy(&sep->se_ctrladdr6, bind_sa6,
1821                        sizeof(sep->se_ctrladdr6));
1822                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1823                 break;
1824 #endif
1825         case AF_UNIX:
1826                 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1827                         syslog(LOG_ERR,
1828                             "domain socket pathname too long for service %s",
1829                             sep->se_service);
1830                         goto more;
1831                 }
1832                 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1833                 sep->se_ctrladdr_un.sun_family = sep->se_family;
1834                 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1835                 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1836                 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1837         }
1838         arg = sskip(&cp);
1839         if (!strncmp(arg, "wait", 4))
1840                 sep->se_accept = 0;
1841         else if (!strncmp(arg, "nowait", 6))
1842                 sep->se_accept = 1;
1843         else {
1844                 syslog(LOG_ERR,
1845                         "%s: bad wait/nowait for service %s",
1846                         CONFIG, sep->se_service);
1847                 goto more;
1848         }
1849         sep->se_maxchild = -1;
1850         sep->se_maxcpm = -1;
1851         sep->se_maxperip = -1;
1852         if ((s = strchr(arg, '/')) != NULL) {
1853                 char *eptr;
1854                 u_long val;
1855
1856                 val = strtoul(s + 1, &eptr, 10);
1857                 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1858                         syslog(LOG_ERR,
1859                                 "%s: bad max-child for service %s",
1860                                 CONFIG, sep->se_service);
1861                         goto more;
1862                 }
1863                 if (debug)
1864                         if (!sep->se_accept && val != 1)
1865                                 warnx("maxchild=%lu for wait service %s"
1866                                     " not recommended", val, sep->se_service);
1867                 sep->se_maxchild = val;
1868                 if (*eptr == '/')
1869                         sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1870                 if (*eptr == '/')
1871                         sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1872                 /*
1873                  * explicitly do not check for \0 for future expansion /
1874                  * backwards compatibility
1875                  */
1876         }
1877         if (ISMUX(sep)) {
1878                 /*
1879                  * Silently enforce "nowait" mode for TCPMUX services
1880                  * since they don't have an assigned port to listen on.
1881                  */
1882                 sep->se_accept = 1;
1883                 if (strcmp(sep->se_proto, "tcp")) {
1884                         syslog(LOG_ERR,
1885                                 "%s: bad protocol for tcpmux service %s",
1886                                 CONFIG, sep->se_service);
1887                         goto more;
1888                 }
1889                 if (sep->se_socktype != SOCK_STREAM) {
1890                         syslog(LOG_ERR,
1891                                 "%s: bad socket type for tcpmux service %s",
1892                                 CONFIG, sep->se_service);
1893                         goto more;
1894                 }
1895         }
1896         sep->se_user = newstr(sskip(&cp));
1897 #ifdef LOGIN_CAP
1898         if ((s = strrchr(sep->se_user, '/')) != NULL) {
1899                 *s = '\0';
1900                 sep->se_class = newstr(s + 1);
1901         } else
1902                 sep->se_class = newstr(RESOURCE_RC);
1903 #endif
1904         if ((s = strrchr(sep->se_user, ':')) != NULL) {
1905                 *s = '\0';
1906                 sep->se_group = newstr(s + 1);
1907         } else
1908                 sep->se_group = NULL;
1909         sep->se_server = newstr(sskip(&cp));
1910         if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1911                 sep->se_server_name++;
1912         if (strcmp(sep->se_server, "internal") == 0) {
1913                 struct biltin *bi;
1914
1915                 for (bi = biltins; bi->bi_service; bi++)
1916                         if (bi->bi_socktype == sep->se_socktype &&
1917                             matchservent(bi->bi_service, sep->se_service,
1918                             sep->se_proto))
1919                                 break;
1920                 if (bi->bi_service == 0) {
1921                         syslog(LOG_ERR, "internal service %s unknown",
1922                                 sep->se_service);
1923                         goto more;
1924                 }
1925                 sep->se_accept = 1;     /* force accept mode for built-ins */
1926                 sep->se_bi = bi;
1927         } else
1928                 sep->se_bi = NULL;
1929         if (sep->se_maxperip < 0)
1930                 sep->se_maxperip = maxperip;
1931         if (sep->se_maxcpm < 0)
1932                 sep->se_maxcpm = maxcpm;
1933         if (sep->se_maxchild < 0) {     /* apply default max-children */
1934                 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1935                         sep->se_maxchild = sep->se_bi->bi_maxchild;
1936                 else if (sep->se_accept)
1937                         sep->se_maxchild = MAX(maxchild, 0);
1938                 else
1939                         sep->se_maxchild = 1;
1940         }
1941         if (sep->se_maxchild > 0) {
1942                 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1943                 if (sep->se_pids == NULL) {
1944                         syslog(LOG_ERR, "malloc: %m");
1945                         exit(EX_OSERR);
1946                 }
1947         }
1948         argc = 0;
1949         for (arg = skip(&cp); cp; arg = skip(&cp))
1950                 if (argc < MAXARGV) {
1951                         sep->se_argv[argc++] = newstr(arg);
1952                 } else {
1953                         syslog(LOG_ERR,
1954                                 "%s: too many arguments for service %s",
1955                                 CONFIG, sep->se_service);
1956                         goto more;
1957                 }
1958         while (argc <= MAXARGV)
1959                 sep->se_argv[argc++] = NULL;
1960         for (i = 0; i < PERIPSIZE; ++i)
1961                 LIST_INIT(&sep->se_conn[i]);
1962 #ifdef IPSEC
1963         sep->se_policy = policy ? newstr(policy) : NULL;
1964 #endif
1965         return (sep);
1966 }
1967
1968 void
1969 freeconfig(struct servtab *cp)
1970 {
1971         int i;
1972
1973         if (cp->se_service)
1974                 free(cp->se_service);
1975         if (cp->se_proto)
1976                 free(cp->se_proto);
1977         if (cp->se_user)
1978                 free(cp->se_user);
1979         if (cp->se_group)
1980                 free(cp->se_group);
1981 #ifdef LOGIN_CAP
1982         if (cp->se_class)
1983                 free(cp->se_class);
1984 #endif
1985         if (cp->se_server)
1986                 free(cp->se_server);
1987         if (cp->se_pids)
1988                 free(cp->se_pids);
1989         for (i = 0; i < MAXARGV; i++)
1990                 if (cp->se_argv[i])
1991                         free(cp->se_argv[i]);
1992         free_connlist(cp);
1993 #ifdef IPSEC
1994         if (cp->se_policy)
1995                 free(cp->se_policy);
1996 #endif
1997 }
1998
1999
2000 /*
2001  * Safe skip - if skip returns null, log a syntax error in the
2002  * configuration file and exit.
2003  */
2004 char *
2005 sskip(char **cpp)
2006 {
2007         char *cp;
2008
2009         cp = skip(cpp);
2010         if (cp == NULL) {
2011                 syslog(LOG_ERR, "%s: syntax error", CONFIG);
2012                 exit(EX_DATAERR);
2013         }
2014         return (cp);
2015 }
2016
2017 char *
2018 skip(char **cpp)
2019 {
2020         char *cp = *cpp;
2021         char *start;
2022         char quote = '\0';
2023
2024 again:
2025         while (*cp == ' ' || *cp == '\t')
2026                 cp++;
2027         if (*cp == '\0') {
2028                 int c;
2029
2030                 c = getc(fconfig);
2031                 (void) ungetc(c, fconfig);
2032                 if (c == ' ' || c == '\t')
2033                         if ((cp = nextline(fconfig)))
2034                                 goto again;
2035                 *cpp = (char *)0;
2036                 return ((char *)0);
2037         }
2038         if (*cp == '"' || *cp == '\'')
2039                 quote = *cp++;
2040         start = cp;
2041         if (quote)
2042                 while (*cp && *cp != quote)
2043                         cp++;
2044         else
2045                 while (*cp && *cp != ' ' && *cp != '\t')
2046                         cp++;
2047         if (*cp != '\0')
2048                 *cp++ = '\0';
2049         *cpp = cp;
2050         return (start);
2051 }
2052
2053 char *
2054 nextline(FILE *fd)
2055 {
2056         char *cp;
2057
2058         if (fgets(line, sizeof (line), fd) == NULL)
2059                 return ((char *)0);
2060         cp = strchr(line, '\n');
2061         if (cp)
2062                 *cp = '\0';
2063         return (line);
2064 }
2065
2066 char *
2067 newstr(const char *cp)
2068 {
2069         char *cr;
2070
2071         if ((cr = strdup(cp != NULL ? cp : "")))
2072                 return (cr);
2073         syslog(LOG_ERR, "strdup: %m");
2074         exit(EX_OSERR);
2075 }
2076
2077 void
2078 inetd_setproctitle(const char *a, int s)
2079 {
2080         socklen_t size;
2081         struct sockaddr_storage ss;
2082         char buf[80], pbuf[NI_MAXHOST];
2083
2084         size = sizeof(ss);
2085         if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2086                 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2087                             NULL, 0, NI_NUMERICHOST);
2088                 (void) sprintf(buf, "%s [%s]", a, pbuf);
2089         } else
2090                 (void) sprintf(buf, "%s", a);
2091         setproctitle("%s", buf);
2092 }
2093
2094 int
2095 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2096 {
2097         struct servtab *se2;
2098         char pname[NI_MAXHOST];
2099
2100         for (se2 = servtab; se2; se2 = se2->se_next) {
2101                 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2102                         continue;
2103
2104                 switch (se2->se_family) {
2105                 case AF_INET:
2106                         if (((const struct sockaddr_in *)sa)->sin_port ==
2107                             se2->se_ctrladdr4.sin_port)
2108                                 goto isloop;
2109                         continue;
2110 #ifdef INET6
2111                 case AF_INET6:
2112                         if (((const struct sockaddr_in6 *)sa)->sin6_port ==
2113                             se2->se_ctrladdr6.sin6_port)
2114                                 goto isloop;
2115                         continue;
2116 #endif
2117                 default:
2118                         continue;
2119                 }
2120         isloop:
2121                 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2122                             NI_NUMERICHOST);
2123                 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2124                        sep->se_service, sep->se_proto,
2125                        se2->se_service, se2->se_proto,
2126                        pname);
2127                 return 1;
2128         }
2129         return 0;
2130 }
2131
2132 /*
2133  * print_service:
2134  *      Dump relevant information to stderr
2135  */
2136 void
2137 print_service(const char *action, const struct servtab *sep)
2138 {
2139         fprintf(stderr,
2140             "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2141 #ifdef LOGIN_CAP
2142             "class=%s"
2143 #endif
2144             " builtin=%p server=%s"
2145 #ifdef IPSEC
2146             " policy=\"%s\""
2147 #endif
2148             "\n",
2149             action, sep->se_service, sep->se_proto,
2150             sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2151 #ifdef LOGIN_CAP
2152             sep->se_class,
2153 #endif
2154             (void *) sep->se_bi, sep->se_server
2155 #ifdef IPSEC
2156             , (sep->se_policy ? sep->se_policy : "")
2157 #endif
2158             );
2159 }
2160
2161 #define CPMHSIZE        256
2162 #define CPMHMASK        (CPMHSIZE-1)
2163 #define CHTGRAN         10
2164 #define CHTSIZE         6
2165
2166 typedef struct CTime {
2167         unsigned long   ct_Ticks;
2168         int             ct_Count;
2169 } CTime;
2170
2171 typedef struct CHash {
2172         union {
2173                 struct in_addr  c4_Addr;
2174                 struct in6_addr c6_Addr;
2175         } cu_Addr;
2176 #define ch_Addr4        cu_Addr.c4_Addr
2177 #define ch_Addr6        cu_Addr.c6_Addr
2178         int             ch_Family;
2179         time_t          ch_LTime;
2180         char            *ch_Service;
2181         CTime           ch_Times[CHTSIZE];
2182 } CHash;
2183
2184 CHash   CHashAry[CPMHSIZE];
2185
2186 int
2187 cpmip(const struct servtab *sep, int ctrl)
2188 {
2189         struct sockaddr_storage rss;
2190         socklen_t rssLen = sizeof(rss);
2191         int r = 0;
2192
2193         /*
2194          * If getpeername() fails, just let it through (if logging is
2195          * enabled the condition is caught elsewhere)
2196          */
2197
2198         if (sep->se_maxcpm > 0 &&
2199            (sep->se_family == AF_INET || sep->se_family == AF_INET6) &&
2200             getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2201                 time_t t = time(NULL);
2202                 int hv = 0xABC3D20F;
2203                 int i;
2204                 int cnt = 0;
2205                 CHash *chBest = NULL;
2206                 unsigned int ticks = t / CHTGRAN;
2207                 struct sockaddr_in *sin4;
2208 #ifdef INET6
2209                 struct sockaddr_in6 *sin6;
2210 #endif
2211
2212                 sin4 = (struct sockaddr_in *)&rss;
2213 #ifdef INET6
2214                 sin6 = (struct sockaddr_in6 *)&rss;
2215 #endif
2216                 {
2217                         char *p;
2218                         int addrlen;
2219
2220                         switch (rss.ss_family) {
2221                         case AF_INET:
2222                                 p = (char *)&sin4->sin_addr;
2223                                 addrlen = sizeof(struct in_addr);
2224                                 break;
2225 #ifdef INET6
2226                         case AF_INET6:
2227                                 p = (char *)&sin6->sin6_addr;
2228                                 addrlen = sizeof(struct in6_addr);
2229                                 break;
2230 #endif
2231                         default:
2232                                 /* should not happen */
2233                                 return -1;
2234                         }
2235
2236                         for (i = 0; i < addrlen; ++i, ++p) {
2237                                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2238                         }
2239                         hv = (hv ^ (hv >> 16));
2240                 }
2241                 for (i = 0; i < 5; ++i) {
2242                         CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2243
2244                         if (rss.ss_family == AF_INET &&
2245                             ch->ch_Family == AF_INET &&
2246                             sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2247                             ch->ch_Service && strcmp(sep->se_service,
2248                             ch->ch_Service) == 0) {
2249                                 chBest = ch;
2250                                 break;
2251                         }
2252 #ifdef INET6
2253                         if (rss.ss_family == AF_INET6 &&
2254                             ch->ch_Family == AF_INET6 &&
2255                             IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2256                                                &ch->ch_Addr6) != 0 &&
2257                             ch->ch_Service && strcmp(sep->se_service,
2258                             ch->ch_Service) == 0) {
2259                                 chBest = ch;
2260                                 break;
2261                         }
2262 #endif
2263                         if (chBest == NULL || ch->ch_LTime == 0 ||
2264                             ch->ch_LTime < chBest->ch_LTime) {
2265                                 chBest = ch;
2266                         }
2267                 }
2268                 if ((rss.ss_family == AF_INET &&
2269                      (chBest->ch_Family != AF_INET ||
2270                       sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2271                     chBest->ch_Service == NULL ||
2272                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2273                         chBest->ch_Family = sin4->sin_family;
2274                         chBest->ch_Addr4 = sin4->sin_addr;
2275                         if (chBest->ch_Service)
2276                                 free(chBest->ch_Service);
2277                         chBest->ch_Service = strdup(sep->se_service);
2278                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2279                 }
2280 #ifdef INET6
2281                 if ((rss.ss_family == AF_INET6 &&
2282                      (chBest->ch_Family != AF_INET6 ||
2283                       IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2284                                          &chBest->ch_Addr6) == 0)) ||
2285                     chBest->ch_Service == NULL ||
2286                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2287                         chBest->ch_Family = sin6->sin6_family;
2288                         chBest->ch_Addr6 = sin6->sin6_addr;
2289                         if (chBest->ch_Service)
2290                                 free(chBest->ch_Service);
2291                         chBest->ch_Service = strdup(sep->se_service);
2292                         bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2293                 }
2294 #endif
2295                 chBest->ch_LTime = t;
2296                 {
2297                         CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2298                         if (ct->ct_Ticks != ticks) {
2299                                 ct->ct_Ticks = ticks;
2300                                 ct->ct_Count = 0;
2301                         }
2302                         ++ct->ct_Count;
2303                 }
2304                 for (i = 0; i < CHTSIZE; ++i) {
2305                         CTime *ct = &chBest->ch_Times[i];
2306                         if (ct->ct_Ticks <= ticks &&
2307                             ct->ct_Ticks >= ticks - CHTSIZE) {
2308                                 cnt += ct->ct_Count;
2309                         }
2310                 }
2311                 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) {
2312                         char pname[NI_MAXHOST];
2313
2314                         getnameinfo((struct sockaddr *)&rss,
2315                                     ((struct sockaddr *)&rss)->sa_len,
2316                                     pname, sizeof(pname), NULL, 0,
2317                                     NI_NUMERICHOST);
2318                         r = -1;
2319                         syslog(LOG_ERR,
2320                             "%s from %s exceeded counts/min (limit %d/min)",
2321                             sep->se_service, pname,
2322                             sep->se_maxcpm);
2323                 }
2324         }
2325         return(r);
2326 }
2327
2328 static struct conninfo *
2329 search_conn(struct servtab *sep, int ctrl)
2330 {
2331         struct sockaddr_storage ss;
2332         socklen_t sslen = sizeof(ss);
2333         struct conninfo *conn;
2334         int hv;
2335         char pname[NI_MAXHOST],  pname2[NI_MAXHOST];
2336
2337         if (sep->se_maxperip <= 0)
2338                 return NULL;
2339
2340         /*
2341          * If getpeername() fails, just let it through (if logging is
2342          * enabled the condition is caught elsewhere)
2343          */
2344         if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2345                 return NULL;
2346
2347         switch (ss.ss_family) {
2348         case AF_INET:
2349                 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2350                     sizeof(struct in_addr));
2351                 break;
2352 #ifdef INET6
2353         case AF_INET6:
2354                 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2355                     sizeof(struct in6_addr));
2356                 break;
2357 #endif
2358         default:
2359                 /*
2360                  * Since we only support AF_INET and AF_INET6, just
2361                  * let other than AF_INET and AF_INET6 through.
2362                  */
2363                 return NULL;
2364         }
2365
2366         if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2367             NULL, 0, NI_NUMERICHOST) != 0)
2368                 return NULL;
2369
2370         LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2371                 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2372                     conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2373                     NI_NUMERICHOST) == 0 &&
2374                     strcmp(pname, pname2) == 0)
2375                         break;
2376         }
2377
2378         if (conn == NULL) {
2379                 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2380                         syslog(LOG_ERR, "malloc: %m");
2381                         exit(EX_OSERR);
2382                 }
2383                 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2384                 if (conn->co_proc == NULL) {
2385                         syslog(LOG_ERR, "malloc: %m");
2386                         exit(EX_OSERR);
2387                 }
2388                 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2389                 conn->co_numchild = 0;
2390                 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2391         }
2392
2393         /*
2394          * Since a child process is not invoked yet, we cannot
2395          * determine a pid of a child.  So, co_proc and co_numchild
2396          * should be filled leter.
2397          */
2398
2399         return conn;
2400 }
2401
2402 static int
2403 room_conn(struct servtab *sep, struct conninfo *conn)
2404 {
2405         char pname[NI_MAXHOST];
2406
2407         if (conn->co_numchild >= sep->se_maxperip) {
2408                 getnameinfo((struct sockaddr *)&conn->co_addr,
2409                     conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2410                     NI_NUMERICHOST);
2411                 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2412                     sep->se_service, pname, sep->se_maxperip);
2413                 return 0;
2414         }
2415         return 1;
2416 }
2417
2418 static void
2419 addchild_conn(struct conninfo *conn, pid_t pid)
2420 {
2421         struct procinfo *proc;
2422
2423         if (conn == NULL)
2424                 return;
2425
2426         if ((proc = search_proc(pid, 1)) != NULL) {
2427                 if (proc->pr_conn != NULL) {
2428                         syslog(LOG_ERR,
2429                             "addchild_conn: child already on process list");
2430                         exit(EX_OSERR);
2431                 }
2432                 proc->pr_conn = conn;
2433         }
2434
2435         conn->co_proc[conn->co_numchild++] = proc;
2436 }
2437
2438 static void
2439 reapchild_conn(pid_t pid)
2440 {
2441         struct procinfo *proc;
2442         struct conninfo *conn;
2443         int i;
2444
2445         if ((proc = search_proc(pid, 0)) == NULL)
2446                 return;
2447         if ((conn = proc->pr_conn) == NULL)
2448                 return;
2449         for (i = 0; i < conn->co_numchild; ++i)
2450                 if (conn->co_proc[i] == proc) {
2451                         conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2452                         break;
2453                 }
2454         free_proc(proc);
2455         free_conn(conn);
2456 }
2457
2458 static void
2459 resize_conn(struct servtab *sep, int maxpip)
2460 {
2461         struct conninfo *conn;
2462         int i, j;
2463
2464         if (sep->se_maxperip <= 0)
2465                 return;
2466         if (maxpip <= 0) {
2467                 free_connlist(sep);
2468                 return;
2469         }
2470         for (i = 0; i < PERIPSIZE; ++i) {
2471                 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2472                         for (j = maxpip; j < conn->co_numchild; ++j)
2473                                 free_proc(conn->co_proc[j]);
2474                         conn->co_proc = realloc(conn->co_proc,
2475                             maxpip * sizeof(*conn->co_proc));
2476                         if (conn->co_proc == NULL) {
2477                                 syslog(LOG_ERR, "realloc: %m");
2478                                 exit(EX_OSERR);
2479                         }
2480                         if (conn->co_numchild > maxpip)
2481                                 conn->co_numchild = maxpip;
2482                 }
2483         }
2484 }
2485
2486 static void
2487 free_connlist(struct servtab *sep)
2488 {
2489         struct conninfo *conn;
2490         int i, j;
2491
2492         for (i = 0; i < PERIPSIZE; ++i) {
2493                 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2494                         for (j = 0; j < conn->co_numchild; ++j)
2495                                 free_proc(conn->co_proc[j]);
2496                         conn->co_numchild = 0;
2497                         free_conn(conn);
2498                 }
2499         }
2500 }
2501
2502 static void
2503 free_conn(struct conninfo *conn)
2504 {
2505         if (conn == NULL)
2506                 return;
2507         if (conn->co_numchild <= 0) {
2508                 LIST_REMOVE(conn, co_link);
2509                 free(conn->co_proc);
2510                 free(conn);
2511         }
2512 }
2513
2514 static struct procinfo *
2515 search_proc(pid_t pid, int add)
2516 {
2517         struct procinfo *proc;
2518         int hv;
2519
2520         hv = hashval((char *)&pid, sizeof(pid));
2521         LIST_FOREACH(proc, &proctable[hv], pr_link) {
2522                 if (proc->pr_pid == pid)
2523                         break;
2524         }
2525         if (proc == NULL && add) {
2526                 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2527                         syslog(LOG_ERR, "malloc: %m");
2528                         exit(EX_OSERR);
2529                 }
2530                 proc->pr_pid = pid;
2531                 proc->pr_conn = NULL;
2532                 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2533         }
2534         return proc;
2535 }
2536
2537 static void
2538 free_proc(struct procinfo *proc)
2539 {
2540         if (proc == NULL)
2541                 return;
2542         LIST_REMOVE(proc, pr_link);
2543         free(proc);
2544 }
2545
2546 static int
2547 hashval(char *p, int len)
2548 {
2549         int i, hv = 0xABC3D20F;
2550
2551         for (i = 0; i < len; ++i, ++p)
2552                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2553         hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2554         return hv;
2555 }