usr.sbin/inetd/inetd.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1983, 1991, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #ifndef lint
  36 __COPYRIGHT("@(#) Copyright (c) 1983, 1991, 1993, 1994\n\
  37         The Regents of the University of California.  All rights reserved.\n");
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)from: inetd.c       8.4 (Berkeley) 4/13/94";
  43 #endif
  44 #endif /* not lint */
  45
  46 /*
  47  * Inetd - Internet super-server
  48  *
  49  * This program invokes all internet services as needed.  Connection-oriented
  50  * services are invoked each time a connection is made, by creating a process.
  51  * This process is passed the connection as file descriptor 0 and is expected
  52  * to do a getpeername to find out the source host and port.
  53  *
  54  * Datagram oriented services are invoked when a datagram
  55  * arrives; a process is created and passed a pending message
  56  * on file descriptor 0.  Datagram servers may either connect
  57  * to their peer, freeing up the original socket for inetd
  58  * to receive further messages on, or ``take over the socket'',
  59  * processing all arriving datagrams and, eventually, timing
  60  * out.  The first type of server is said to be ``multi-threaded'';
  61  * the second type of server ``single-threaded''.
  62  *
  63  * Inetd uses a configuration file which is read at startup
  64  * and, possibly, at some later time in response to a hangup signal.
  65  * The configuration file is ``free format'' with fields given in the
  66  * order shown below.  Continuation lines for an entry must begin with
  67  * a space or tab.  All fields must be present in each entry.
  68  *
  69  *      service name                    must be in /etc/services
  70  *                                      or name a tcpmux service
  71  *                                      or specify a unix domain socket
  72  *      socket type                     stream/dgram/raw/rdm/seqpacket
  73  *      protocol                        tcp[4][6], udp[4][6], unix
  74  *      wait/nowait                     single-threaded/multi-threaded
  75  *      user[:group][/login-class]      user/group/login-class to run daemon as
  76  *      server program                  full path name
  77  *      server program arguments        maximum of MAXARGS (20)
  78  *
  79  * TCP services without official port numbers are handled with the
  80  * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
  81  * requests. When a connection is made from a foreign host, the service
  82  * requested is passed to tcpmux, which looks it up in the servtab list
  83  * and returns the proper entry for the service. Tcpmux returns a
  84  * negative reply if the service doesn't exist, otherwise the invoked
  85  * server is expected to return the positive reply if the service type in
  86  * inetd.conf file has the prefix "tcpmux/". If the service type has the
  87  * prefix "tcpmux/+", tcpmux will return the positive reply for the
  88  * process; this is for compatibility with older server code, and also
  89  * allows you to invoke programs that use stdin/stdout without putting any
  90  * special server code in them. Services that use tcpmux are "nowait"
  91  * because they do not have a well-known port and hence cannot listen
  92  * for new requests.
  93  *
  94  * For RPC services
  95  *      service name/version            must be in /etc/rpc
  96  *      socket type                     stream/dgram/raw/rdm/seqpacket
  97  *      protocol                        rpc/tcp[4][6], rpc/udp[4][6]
  98  *      wait/nowait                     single-threaded/multi-threaded
  99  *      user[:group][/login-class]      user/group/login-class to run daemon as
 100  *      server program                  full path name
 101  *      server program arguments        maximum of MAXARGS
 102  *
 103  * Comment lines are indicated by a `#' in column 1.
 104  *
 105  * #ifdef IPSEC
 106  * Comment lines that start with "#@" denote IPsec policy string, as described
 107  * in ipsec_set_policy(3).  This will affect all the following items in
 108  * inetd.conf(8).  To reset the policy, just use "#@" line.  By default,
 109  * there's no IPsec policy.
 110  * #endif
 111  */
 112 #include <sys/param.h>
 113 #include <sys/ioctl.h>
 114 #include <sys/mman.h>
 115 #include <sys/wait.h>
 116 #include <sys/time.h>
 117 #include <sys/resource.h>
 118 #include <sys/stat.h>
 119 #include <sys/un.h>
 120
 121 #include <netinet/in.h>
 122 #include <netinet/tcp.h>
 123 #include <arpa/inet.h>
 124 #include <rpc/rpc.h>
 125 #include <rpc/pmap_clnt.h>
 126
 127 #include <ctype.h>
 128 #include <errno.h>
 129 #include <err.h>
 130 #include <fcntl.h>
 131 #include <grp.h>
 132 #include <libutil.h>
 133 #include <limits.h>
 134 #include <netdb.h>
 135 #include <pwd.h>
 136 #include <signal.h>
 137 #include <stdio.h>
 138 #include <stdlib.h>
 139 #include <string.h>
 140 #include <sysexits.h>
 141 #include <syslog.h>
 142 #ifdef LIBWRAP
 143 #include <tcpd.h>
 144 #endif
 145 #include <unistd.h>
 146
 147 #include "inetd.h"
 148 #include "pathnames.h"
 149
 150 #ifdef IPSEC
 151 #include <netipsec/ipsec.h>
 152 #ifndef IPSEC_POLICY_IPSEC      /* no ipsec support on old ipsec */
 153 #undef IPSEC
 154 #endif
 155 #endif
 156
 157 #ifndef LIBWRAP_ALLOW_FACILITY
 158 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
 159 #endif
 160 #ifndef LIBWRAP_ALLOW_SEVERITY
 161 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
 162 #endif
 163 #ifndef LIBWRAP_DENY_FACILITY
 164 # define LIBWRAP_DENY_FACILITY LOG_AUTH
 165 #endif
 166 #ifndef LIBWRAP_DENY_SEVERITY
 167 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
 168 #endif
 169
 170 #define ISWRAP(sep)     \
 171            ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
 172         && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
 173         && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
 174             || (sep)->se_socktype == SOCK_DGRAM))
 175
 176 #ifdef LOGIN_CAP
 177 #include <login_cap.h>
 178
 179 /* see init.c */
 180 #define RESOURCE_RC "daemon"
 181
 182 #endif
 183
 184 #ifndef MAXCHILD
 185 #define MAXCHILD        -1              /* maximum number of this service
 186                                            < 0 = no limit */
 187 #endif
 188
 189 #ifndef MAXCPM
 190 #define MAXCPM          -1              /* rate limit invocations from a
 191                                            single remote address,
 192                                            < 0 = no limit */
 193 #endif
 194
 195 #ifndef MAXPERIP
 196 #define MAXPERIP        -1              /* maximum number of this service
 197                                            from a single remote address,
 198                                            < 0 = no limit */
 199 #endif
 200
 201 #ifndef TOOMANY
 202 #define TOOMANY         256             /* don't start more than TOOMANY */
 203 #endif
 204 #define CNT_INTVL       60              /* servers in CNT_INTVL sec. */
 205 #define RETRYTIME       (60*10)         /* retry after bind or server fail */
 206 #define MAX_MAXCHLD     32767           /* max allowable max children */
 207
 208 #define SIGBLOCK        (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
 209
 210 #define satosin(sa)     ((struct sockaddr_in *)(void *)sa)
 211 #define csatosin(sa)    ((const struct sockaddr_in *)(const void *)sa)
 212 #ifdef INET6
 213 #define satosin6(sa)    ((struct sockaddr_in6 *)(void *)sa)
 214 #define csatosin6(sa)   ((const struct sockaddr_in6 *)(const void *)sa)
 215 #endif
 216 static void     close_sep(struct servtab *);
 217 static void     flag_signal(int);
 218 static void     config(void);
 219 static int      cpmip(const struct servtab *, int);
 220 static void     endconfig(void);
 221 static struct servtab *enter(struct servtab *);
 222 static void     freeconfig(struct servtab *);
 223 static struct servtab *getconfigent(void);
 224 static int      matchservent(const char *, const char *, const char *);
 225 static char     *nextline(FILE *);
 226 static void     addchild(struct servtab *, int);
 227 static void     reapchild(void);
 228 static void     enable(struct servtab *);
 229 static void     disable(struct servtab *);
 230 static void     retry(void);
 231 static int      setconfig(void);
 232 static void     setup(struct servtab *);
 233 #ifdef IPSEC
 234 static void     ipsecsetup(struct servtab *);
 235 #endif
 236 static void     unregisterrpc(register struct servtab *sep);
 237 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
 238 static int      room_conn(struct servtab *sep, struct conninfo *conn);
 239 static void     addchild_conn(struct conninfo *conn, pid_t pid);
 240 static void     reapchild_conn(pid_t pid);
 241 static void     free_conn(struct conninfo *conn);
 242 static void     resize_conn(struct servtab *sep, int maxperip);
 243 static void     free_connlist(struct servtab *sep);
 244 static void     free_proc(struct procinfo *);
 245 static struct procinfo *search_proc(pid_t pid, int add);
 246 static int      hashval(char *p, int len);
 247 static char     *skip(char **);
 248 static char     *sskip(char **);
 249 static char     *newstr(const char *);
 250 static void     print_service(const char *, const struct servtab *);
 251
 252 #ifdef LIBWRAP
 253 /* tcpd.h */
 254 int     allow_severity;
 255 int     deny_severity;
 256 #endif
 257
 258 static int      wrap_ex = 0;
 259 static int      wrap_bi = 0;
 260 int     debug = 0;
 261 static int      dolog = 0;
 262 static int      maxsock;                /* highest-numbered descriptor */
 263 static fd_set   allsock;
 264 static int      options;
 265 static int      timingout;
 266 static int      toomany = TOOMANY;
 267 static int      maxchild = MAXCHILD;
 268 static int      maxcpm = MAXCPM;
 269 static int      maxperip = MAXPERIP;
 270 static struct   servent *sp;
 271 static struct   rpcent *rpc;
 272 static char     *hostname = NULL;
 273 static struct   sockaddr_in *bind_sa4;
 274 static int      v4bind_ok = 0;
 275 #ifdef INET6
 276 static struct   sockaddr_in6 *bind_sa6;
 277 static int      v6bind_ok = 0;
 278 #endif
 279 static int      signalpipe[2];
 280 #ifdef SANITY_CHECK
 281 static int      nsock;
 282 #endif
 283 static uid_t    euid;
 284 static gid_t    egid;
 285 static mode_t   mask;
 286
 287 struct servtab *servtab;
 288
 289 static const char       *CONFIG = _PATH_INETDCONF;
 290 static const char       *pid_file = _PATH_INETDPID;
 291 static struct pidfh     *pfh = NULL;
 292
 293 static struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
 294
 295 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
 296
 297 static int
 298 getvalue(const char *arg, int *value, const char *whine)
 299 {
 300         int  tmp;
 301         char *p;
 302
 303         tmp = strtol(arg, &p, 0);
 304         if (tmp < 0 || *p) {
 305                 syslog(LOG_ERR, whine, arg);
 306                 return 1;                       /* failure */
 307         }
 308         *value = tmp;
 309         return 0;                               /* success */
 310 }
 311
 312 #ifdef LIBWRAP
 313 static sa_family_t
 314 whichaf(struct request_info *req)
 315 {
 316         struct sockaddr *sa;
 317
 318         sa = (struct sockaddr *)req->client->sin;
 319         if (sa == NULL)
 320                 return AF_UNSPEC;
 321 #ifdef INET6
 322         if (sa->sa_family == AF_INET6 &&
 323             IN6_IS_ADDR_V4MAPPED(&satosin6(sa)->sin6_addr))
 324                 return AF_INET;
 325 #endif
 326         return sa->sa_family;
 327 }
 328 #endif
 329
 330 int
 331 main(int argc, char **argv)
 332 {
 333         struct servtab *sep;
 334         struct passwd *pwd;
 335         struct group *grp;
 336         struct sigaction sa, saalrm, sachld, sahup, sapipe;
 337         int ch, dofork;
 338         pid_t pid;
 339         char buf[50];
 340 #ifdef LOGIN_CAP
 341         login_cap_t *lc = NULL;
 342 #endif
 343 #ifdef LIBWRAP
 344         struct request_info req;
 345         int denied;
 346         char *service = NULL;
 347 #endif
 348         struct sockaddr_storage peer;
 349         int i;
 350         struct addrinfo hints, *res;
 351         const char *servname;
 352         int error;
 353         struct conninfo *conn;
 354
 355         openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
 356
 357         while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
 358                 switch(ch) {
 359                 case 'd':
 360                         debug = 1;
 361                         options |= SO_DEBUG;
 362                         break;
 363                 case 'l':
 364                         dolog = 1;
 365                         break;
 366                 case 'R':
 367                         getvalue(optarg, &toomany,
 368                                 "-R %s: bad value for service invocation rate");
 369                         break;
 370                 case 'c':
 371                         getvalue(optarg, &maxchild,
 372                                 "-c %s: bad value for maximum children");
 373                         break;
 374                 case 'C':
 375                         getvalue(optarg, &maxcpm,
 376                                 "-C %s: bad value for maximum children/minute");
 377                         break;
 378                 case 'a':
 379                         hostname = optarg;
 380                         break;
 381                 case 'p':
 382                         pid_file = optarg;
 383                         break;
 384                 case 's':
 385                         getvalue(optarg, &maxperip,
 386                                 "-s %s: bad value for maximum children per source address");
 387                         break;
 388                 case 'w':
 389                         wrap_ex++;
 390                         break;
 391                 case 'W':
 392                         wrap_bi++;
 393                         break;
 394                 case '?':
 395                 default:
 396                         syslog(LOG_ERR,
 397                                 "usage: inetd [-dlwW] [-a address] [-R rate]"
 398                                 " [-c maximum] [-C rate]"
 399                                 " [-p pidfile] [conf-file]");
 400                         exit(EX_USAGE);
 401                 }
 402         /*
 403          * Initialize Bind Addrs.
 404          *   When hostname is NULL, wild card bind addrs are obtained from
 405          *   getaddrinfo(). But getaddrinfo() requires at least one of
 406          *   hostname or servname is non NULL.
 407          *   So when hostname is NULL, set dummy value to servname.
 408          *   Since getaddrinfo() doesn't accept numeric servname, and
 409          *   we doesn't use ai_socktype of struct addrinfo returned
 410          *   from getaddrinfo(), we set dummy value to ai_socktype.
 411          */
 412         servname = (hostname == NULL) ? "0" /* dummy */ : NULL;
 413
 414         memset(&hints, 0, sizeof(struct addrinfo));
 415         hints.ai_flags = AI_PASSIVE;
 416         hints.ai_family = AF_UNSPEC;
 417         hints.ai_socktype = SOCK_STREAM;        /* dummy */
 418         error = getaddrinfo(hostname, servname, &hints, &res);
 419         if (error != 0) {
 420                 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
 421                 if (error == EAI_SYSTEM)
 422                         syslog(LOG_ERR, "%s", strerror(errno));
 423                 exit(EX_USAGE);
 424         }
 425         do {
 426                 if (res->ai_addr == NULL) {
 427                         syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
 428                         exit(EX_USAGE);
 429                 }
 430                 switch (res->ai_addr->sa_family) {
 431                 case AF_INET:
 432                         if (v4bind_ok)
 433                                 continue;
 434                         bind_sa4 = satosin(res->ai_addr);
 435                         /* init port num in case servname is dummy */
 436                         bind_sa4->sin_port = 0;
 437                         v4bind_ok = 1;
 438                         continue;
 439 #ifdef INET6
 440                 case AF_INET6:
 441                         if (v6bind_ok)
 442                                 continue;
 443                         bind_sa6 = satosin6(res->ai_addr);
 444                         /* init port num in case servname is dummy */
 445                         bind_sa6->sin6_port = 0;
 446                         v6bind_ok = 1;
 447                         continue;
 448 #endif
 449                 }
 450                 if (v4bind_ok
 451 #ifdef INET6
 452                     && v6bind_ok
 453 #endif
 454                     )
 455                         break;
 456         } while ((res = res->ai_next) != NULL);
 457         if (!v4bind_ok
 458 #ifdef INET6
 459             && !v6bind_ok
 460 #endif
 461             ) {
 462                 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
 463                 exit(EX_USAGE);
 464         }
 465
 466         euid = geteuid();
 467         egid = getegid();
 468         umask(mask = umask(0777));
 469
 470         argc -= optind;
 471         argv += optind;
 472
 473         if (argc > 0)
 474                 CONFIG = argv[0];
 475         if (access(CONFIG, R_OK) < 0)
 476                 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG);
 477         if (debug == 0) {
 478                 pid_t otherpid;
 479
 480                 pfh = pidfile_open(pid_file, 0600, &otherpid);
 481                 if (pfh == NULL) {
 482                         if (errno == EEXIST) {
 483                                 syslog(LOG_ERR, "%s already running, pid: %d",
 484                                     getprogname(), otherpid);
 485                                 exit(EX_OSERR);
 486                         }
 487                         syslog(LOG_WARNING, "pidfile_open() failed: %m");
 488                 }
 489
 490                 if (daemon(0, 0) < 0) {
 491                         syslog(LOG_WARNING, "daemon(0,0) failed: %m");
 492                 }
 493                 /* From now on we don't want syslog messages going to stderr. */
 494                 closelog();
 495                 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
 496                 /*
 497                  * In case somebody has started inetd manually, we need to
 498                  * clear the logname, so that old servers run as root do not
 499                  * get the user's logname..
 500                  */
 501                 if (setlogin("") < 0) {
 502                         syslog(LOG_WARNING, "cannot clear logname: %m");
 503                         /* no big deal if it fails.. */
 504                 }
 505                 if (pfh != NULL && pidfile_write(pfh) == -1) {
 506                         syslog(LOG_WARNING, "pidfile_write(): %m");
 507                 }
 508         }
 509
 510         if (madvise(NULL, 0, MADV_PROTECT) != 0)
 511                 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno));
 512
 513         for (i = 0; i < PERIPSIZE; ++i)
 514                 LIST_INIT(&proctable[i]);
 515
 516         if (v4bind_ok) {
 517                 udpconf = getnetconfigent("udp");
 518                 tcpconf = getnetconfigent("tcp");
 519                 if (udpconf == NULL || tcpconf == NULL) {
 520                         syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp");
 521                         exit(EX_USAGE);
 522                 }
 523         }
 524 #ifdef INET6
 525         if (v6bind_ok) {
 526                 udp6conf = getnetconfigent("udp6");
 527                 tcp6conf = getnetconfigent("tcp6");
 528                 if (udp6conf == NULL || tcp6conf == NULL) {
 529                         syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6");
 530                         exit(EX_USAGE);
 531                 }
 532         }
 533 #endif
 534
 535         sa = (struct sigaction){
 536             .sa_flags = 0,
 537             .sa_handler = flag_signal,
 538         };
 539         sigemptyset(&sa.sa_mask);
 540         sigaddset(&sa.sa_mask, SIGALRM);
 541         sigaddset(&sa.sa_mask, SIGCHLD);
 542         sigaddset(&sa.sa_mask, SIGHUP);
 543         sigaction(SIGALRM, &sa, &saalrm);
 544         config();
 545         sigaction(SIGHUP, &sa, &sahup);
 546         sigaction(SIGCHLD, &sa, &sachld);
 547         sa.sa_handler = SIG_IGN;
 548         sigaction(SIGPIPE, &sa, &sapipe);
 549
 550         {
 551                 /* space for daemons to overwrite environment for ps */
 552 #define DUMMYSIZE       100
 553                 char dummy[DUMMYSIZE];
 554
 555                 (void)memset(dummy, 'x', DUMMYSIZE - 1);
 556                 dummy[DUMMYSIZE - 1] = '\0';
 557                 (void)setenv("inetd_dummy", dummy, 1);
 558         }
 559
 560         if (pipe2(signalpipe, O_CLOEXEC) != 0) {
 561                 syslog(LOG_ERR, "pipe: %m");
 562                 exit(EX_OSERR);
 563         }
 564         FD_SET(signalpipe[0], &allsock);
 565 #ifdef SANITY_CHECK
 566         nsock++;
 567 #endif
 568         maxsock = MAX(MAX(maxsock, signalpipe[0]), signalpipe[1]);
 569
 570         for (;;) {
 571             int n, ctrl;
 572             fd_set readable;
 573
 574 #ifdef SANITY_CHECK
 575             if (nsock == 0) {
 576                 syslog(LOG_ERR, "%s: nsock=0", __func__);
 577                 exit(EX_SOFTWARE);
 578             }
 579 #endif
 580             readable = allsock;
 581             if ((n = select(maxsock + 1, &readable, (fd_set *)0,
 582                 (fd_set *)0, (struct timeval *)0)) <= 0) {
 583                     if (n < 0 && errno != EINTR) {
 584                         syslog(LOG_WARNING, "select: %m");
 585                         sleep(1);
 586                     }
 587                     continue;
 588             }
 589             /* handle any queued signal flags */
 590             if (FD_ISSET(signalpipe[0], &readable)) {
 591                 int nsig, signo;
 592
 593                 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
 594                         syslog(LOG_ERR, "ioctl: %m");
 595                         exit(EX_OSERR);
 596                 }
 597                 nsig /= sizeof(signo);
 598                 while (--nsig >= 0) {
 599                         size_t len;
 600
 601                         len = read(signalpipe[0], &signo, sizeof(signo));
 602                         if (len != sizeof(signo)) {
 603                                 syslog(LOG_ERR, "read: %m");
 604                                 exit(EX_OSERR);
 605                         }
 606                         if (debug)
 607                                 warnx("handling signal flag %d", signo);
 608                         switch (signo) {
 609                         case SIGALRM:
 610                                 retry();
 611                                 break;
 612                         case SIGCHLD:
 613                                 reapchild();
 614                                 break;
 615                         case SIGHUP:
 616                                 config();
 617                                 break;
 618                         }
 619                 }
 620             }
 621             for (sep = servtab; n && sep; sep = sep->se_next)
 622                 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
 623                     n--;
 624                     if (debug)
 625                             warnx("someone wants %s", sep->se_service);
 626                     dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
 627                     conn = NULL;
 628                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
 629                             i = 1;
 630                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 631                                     syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
 632                             ctrl = accept(sep->se_fd, (struct sockaddr *)0,
 633                                 (socklen_t *)0);
 634                             if (debug)
 635                                     warnx("accept, ctrl %d", ctrl);
 636                             if (ctrl < 0) {
 637                                     if (errno != EINTR)
 638                                             syslog(LOG_WARNING,
 639                                                 "accept (for %s): %m",
 640                                                 sep->se_service);
 641                                       if (sep->se_accept &&
 642                                           sep->se_socktype == SOCK_STREAM)
 643                                               close(ctrl);
 644                                     continue;
 645                             }
 646                             i = 0;
 647                             if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
 648                                     syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
 649                             if (ioctl(ctrl, FIONBIO, &i) < 0)
 650                                     syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
 651                             if (cpmip(sep, ctrl) < 0) {
 652                                 close(ctrl);
 653                                 continue;
 654                             }
 655                             if (dofork &&
 656                                 (conn = search_conn(sep, ctrl)) != NULL &&
 657                                 !room_conn(sep, conn)) {
 658                                 close(ctrl);
 659                                 continue;
 660                             }
 661                     } else
 662                             ctrl = sep->se_fd;
 663                     if (dolog && !ISWRAP(sep)) {
 664                             char pname[NI_MAXHOST] = "unknown";
 665                             socklen_t sl;
 666                             sl = sizeof(peer);
 667                             if (getpeername(ctrl, (struct sockaddr *)
 668                                             &peer, &sl)) {
 669                                     sl = sizeof(peer);
 670                                     if (recvfrom(ctrl, buf, sizeof(buf),
 671                                         MSG_PEEK,
 672                                         (struct sockaddr *)&peer,
 673                                         &sl) >= 0) {
 674                                       getnameinfo((struct sockaddr *)&peer,
 675                                                   peer.ss_len,
 676                                                   pname, sizeof(pname),
 677                                                   NULL, 0, NI_NUMERICHOST);
 678                                     }
 679                             } else {
 680                                     getnameinfo((struct sockaddr *)&peer,
 681                                                 peer.ss_len,
 682                                                 pname, sizeof(pname),
 683                                                 NULL, 0, NI_NUMERICHOST);
 684                             }
 685                             syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
 686                     }
 687                     (void) sigblock(SIGBLOCK);
 688                     pid = 0;
 689                     /*
 690                      * Fork for all external services, builtins which need to
 691                      * fork and anything we're wrapping (as wrapping might
 692                      * block or use hosts_options(5) twist).
 693                      */
 694                     if (dofork) {
 695                             if (sep->se_count++ == 0)
 696                                 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time);
 697                             else if (toomany > 0 && sep->se_count >= toomany) {
 698                                 struct timespec now;
 699
 700                                 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 701                                 if (now.tv_sec - sep->se_time.tv_sec >
 702                                     CNT_INTVL) {
 703                                         sep->se_time = now;
 704                                         sep->se_count = 1;
 705                                 } else {
 706                                         syslog(LOG_ERR,
 707                         "%s/%s server failing (looping), service terminated",
 708                                             sep->se_service, sep->se_proto);
 709                                         if (sep->se_accept &&
 710                                             sep->se_socktype == SOCK_STREAM)
 711                                                 close(ctrl);
 712                                         close_sep(sep);
 713                                         free_conn(conn);
 714                                         sigsetmask(0L);
 715                                         if (!timingout) {
 716                                                 timingout = 1;
 717                                                 alarm(RETRYTIME);
 718                                         }
 719                                         continue;
 720                                 }
 721                             }
 722                             pid = fork();
 723                     }
 724                     if (pid < 0) {
 725                             syslog(LOG_ERR, "fork: %m");
 726                             if (sep->se_accept &&
 727                                 sep->se_socktype == SOCK_STREAM)
 728                                     close(ctrl);
 729                             free_conn(conn);
 730                             sigsetmask(0L);
 731                             sleep(1);
 732                             continue;
 733                     }
 734                     if (pid) {
 735                         addchild_conn(conn, pid);
 736                         addchild(sep, pid);
 737                     }
 738                     sigsetmask(0L);
 739                     if (pid == 0) {
 740                             pidfile_close(pfh);
 741                             if (dofork) {
 742                                 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
 743                                 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
 744                                 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
 745                                 /* SIGPIPE reset before exec */
 746                             }
 747                             /*
 748                              * Call tcpmux to find the real service to exec.
 749                              */
 750                             if (sep->se_bi &&
 751                                 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
 752                                     sep = tcpmux(ctrl);
 753                                     if (sep == NULL) {
 754                                             close(ctrl);
 755                                             _exit(0);
 756                                     }
 757                             }
 758 #ifdef LIBWRAP
 759                             if (ISWRAP(sep)) {
 760                                 inetd_setproctitle("wrapping", ctrl);
 761                                 service = sep->se_server_name ?
 762                                     sep->se_server_name : sep->se_service;
 763                                 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0);
 764                                 fromhost(&req);
 765                                 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
 766                                 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
 767                                 denied = !hosts_access(&req);
 768                                 if (denied) {
 769                                     syslog(deny_severity,
 770                                         "refused connection from %.500s, service %s (%s%s)",
 771                                         eval_client(&req), service, sep->se_proto,
 772                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 773                                     if (sep->se_socktype != SOCK_STREAM)
 774                                         recv(ctrl, buf, sizeof (buf), 0);
 775                                     if (dofork) {
 776                                         sleep(1);
 777                                         _exit(0);
 778                                     }
 779                                 }
 780                                 if (dolog) {
 781                                     syslog(allow_severity,
 782                                         "connection from %.500s, service %s (%s%s)",
 783                                         eval_client(&req), service, sep->se_proto,
 784                                         (whichaf(&req) == AF_INET6) ? "6" : "");
 785                                 }
 786                             }
 787 #endif
 788                             if (sep->se_bi) {
 789                                 (*sep->se_bi->bi_fn)(ctrl, sep);
 790                             } else {
 791                                 if (debug)
 792                                         warnx("%d execl %s",
 793                                                 getpid(), sep->se_server);
 794                                 /* Clear close-on-exec. */
 795                                 if (fcntl(ctrl, F_SETFD, 0) < 0) {
 796                                         syslog(LOG_ERR,
 797                                             "%s/%s: fcntl (F_SETFD, 0): %m",
 798                                                 sep->se_service, sep->se_proto);
 799                                         _exit(EX_OSERR);
 800                                 }
 801                                 if (ctrl != 0) {
 802                                         dup2(ctrl, 0);
 803                                         close(ctrl);
 804                                 }
 805                                 dup2(0, 1);
 806                                 dup2(0, 2);
 807                                 if ((pwd = getpwnam(sep->se_user)) == NULL) {
 808                                         syslog(LOG_ERR,
 809                                             "%s/%s: %s: no such user",
 810                                                 sep->se_service, sep->se_proto,
 811                                                 sep->se_user);
 812                                         if (sep->se_socktype != SOCK_STREAM)
 813                                                 recv(0, buf, sizeof (buf), 0);
 814                                         _exit(EX_NOUSER);
 815                                 }
 816                                 grp = NULL;
 817                                 if (   sep->se_group != NULL
 818                                     && (grp = getgrnam(sep->se_group)) == NULL
 819                                    ) {
 820                                         syslog(LOG_ERR,
 821                                             "%s/%s: %s: no such group",
 822                                                 sep->se_service, sep->se_proto,
 823                                                 sep->se_group);
 824                                         if (sep->se_socktype != SOCK_STREAM)
 825                                                 recv(0, buf, sizeof (buf), 0);
 826                                         _exit(EX_NOUSER);
 827                                 }
 828                                 if (grp != NULL)
 829                                         pwd->pw_gid = grp->gr_gid;
 830 #ifdef LOGIN_CAP
 831                                 if ((lc = login_getclass(sep->se_class)) == NULL) {
 832                                         /* error syslogged by getclass */
 833                                         syslog(LOG_ERR,
 834                                             "%s/%s: %s: login class error",
 835                                                 sep->se_service, sep->se_proto,
 836                                                 sep->se_class);
 837                                         if (sep->se_socktype != SOCK_STREAM)
 838                                                 recv(0, buf, sizeof (buf), 0);
 839                                         _exit(EX_NOUSER);
 840                                 }
 841 #endif
 842                                 if (setsid() < 0) {
 843                                         syslog(LOG_ERR,
 844                                                 "%s: can't setsid(): %m",
 845                                                  sep->se_service);
 846                                         /* _exit(EX_OSERR); not fatal yet */
 847                                 }
 848 #ifdef LOGIN_CAP
 849                                 if (setusercontext(lc, pwd, pwd->pw_uid,
 850                                     LOGIN_SETALL & ~LOGIN_SETMAC)
 851                                     != 0) {
 852                                         syslog(LOG_ERR,
 853                                          "%s: can't setusercontext(..%s..): %m",
 854                                          sep->se_service, sep->se_user);
 855                                         _exit(EX_OSERR);
 856                                 }
 857                                 login_close(lc);
 858 #else
 859                                 if (pwd->pw_uid) {
 860                                         if (setlogin(sep->se_user) < 0) {
 861                                                 syslog(LOG_ERR,
 862                                                  "%s: can't setlogin(%s): %m",
 863                                                  sep->se_service, sep->se_user);
 864                                                 /* _exit(EX_OSERR); not yet */
 865                                         }
 866                                         if (setgid(pwd->pw_gid) < 0) {
 867                                                 syslog(LOG_ERR,
 868                                                   "%s: can't set gid %d: %m",
 869                                                   sep->se_service, pwd->pw_gid);
 870                                                 _exit(EX_OSERR);
 871                                         }
 872                                         (void) initgroups(pwd->pw_name,
 873                                                         pwd->pw_gid);
 874                                         if (setuid(pwd->pw_uid) < 0) {
 875                                                 syslog(LOG_ERR,
 876                                                   "%s: can't set uid %d: %m",
 877                                                   sep->se_service, pwd->pw_uid);
 878                                                 _exit(EX_OSERR);
 879                                         }
 880                                 }
 881 #endif
 882                                 sigaction(SIGPIPE, &sapipe,
 883                                     (struct sigaction *)0);
 884                                 execv(sep->se_server, sep->se_argv);
 885                                 syslog(LOG_ERR,
 886                                     "cannot execute %s: %m", sep->se_server);
 887                                 if (sep->se_socktype != SOCK_STREAM)
 888                                         recv(0, buf, sizeof (buf), 0);
 889                             }
 890                             if (dofork)
 891                                 _exit(0);
 892                     }
 893                     if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
 894                             close(ctrl);
 895                 }
 896         }
 897 }
 898
 899 /*
 900  * Add a signal flag to the signal flag queue for later handling
 901  */
 902
 903 static void
 904 flag_signal(int signo)
 905 {
 906         size_t len;
 907
 908         len = write(signalpipe[1], &signo, sizeof(signo));
 909         if (len != sizeof(signo)) {
 910                 syslog(LOG_ERR, "write: %m");
 911                 _exit(EX_OSERR);
 912         }
 913 }
 914
 915 /*
 916  * Record a new child pid for this service. If we've reached the
 917  * limit on children, then stop accepting incoming requests.
 918  */
 919
 920 static void
 921 addchild(struct servtab *sep, pid_t pid)
 922 {
 923         struct stabchild *sc;
 924
 925 #ifdef SANITY_CHECK
 926         if (SERVTAB_EXCEEDS_LIMIT(sep)) {
 927                 syslog(LOG_ERR, "%s: %d >= %d",
 928                     __func__, sep->se_numchild, sep->se_maxchild);
 929                 exit(EX_SOFTWARE);
 930         }
 931 #endif
 932         sc = calloc(1, sizeof(*sc));
 933         if (sc == NULL) {
 934                 syslog(LOG_ERR, "calloc: %m");
 935                 exit(EX_OSERR);
 936         }
 937         sc->sc_pid = pid;
 938         LIST_INSERT_HEAD(&sep->se_children, sc, sc_link);
 939         ++sep->se_numchild;
 940         if (SERVTAB_AT_LIMIT(sep))
 941                 disable(sep);
 942 }
 943
 944 static void
 945 reapchild(void)
 946 {
 947         int status;
 948         pid_t pid;
 949         struct stabchild *sc;
 950         struct servtab *sep;
 951
 952         for (;;) {
 953                 pid = wait3(&status, WNOHANG, (struct rusage *)0);
 954                 if (pid <= 0)
 955                         break;
 956                 if (debug)
 957                         warnx("%d reaped, %s %u", pid,
 958                             WIFEXITED(status) ? "status" : "signal",
 959                             WIFEXITED(status) ? WEXITSTATUS(status)
 960                                 : WTERMSIG(status));
 961                 for (sep = servtab; sep; sep = sep->se_next) {
 962                         LIST_FOREACH(sc, &sep->se_children, sc_link) {
 963                                 if (sc->sc_pid == pid)
 964                                         break;
 965                         }
 966                         if (sc == NULL)
 967                                 continue;
 968                         if (SERVTAB_AT_LIMIT(sep))
 969                                 enable(sep);
 970                         LIST_REMOVE(sc, sc_link);
 971                         free(sc);
 972                         --sep->se_numchild;
 973                         if (WIFSIGNALED(status) || WEXITSTATUS(status))
 974                                 syslog(LOG_WARNING,
 975                                     "%s[%d]: exited, %s %u",
 976                                     sep->se_server, pid,
 977                                     WIFEXITED(status) ? "status" : "signal",
 978                                     WIFEXITED(status) ? WEXITSTATUS(status)
 979                                         : WTERMSIG(status));
 980                         break;
 981                 }
 982                 reapchild_conn(pid);
 983         }
 984 }
 985
 986 static void
 987 config(void)
 988 {
 989         struct servtab *sep, *new, **sepp;
 990         long omask;
 991         int new_nomapped;
 992 #ifdef LOGIN_CAP
 993         login_cap_t *lc = NULL;
 994 #endif
 995
 996         if (!setconfig()) {
 997                 syslog(LOG_ERR, "%s: %m", CONFIG);
 998                 return;
 999         }
1000         for (sep = servtab; sep; sep = sep->se_next)
1001                 sep->se_checked = 0;
1002         while ((new = getconfigent())) {
1003                 if (getpwnam(new->se_user) == NULL) {
1004                         syslog(LOG_ERR,
1005                                 "%s/%s: no such user '%s', service ignored",
1006                                 new->se_service, new->se_proto, new->se_user);
1007                         continue;
1008                 }
1009                 if (new->se_group && getgrnam(new->se_group) == NULL) {
1010                         syslog(LOG_ERR,
1011                                 "%s/%s: no such group '%s', service ignored",
1012                                 new->se_service, new->se_proto, new->se_group);
1013                         continue;
1014                 }
1015 #ifdef LOGIN_CAP
1016                 if ((lc = login_getclass(new->se_class)) == NULL) {
1017                         /* error syslogged by getclass */
1018                         syslog(LOG_ERR,
1019                                 "%s/%s: %s: login class error, service ignored",
1020                                 new->se_service, new->se_proto, new->se_class);
1021                         continue;
1022                 }
1023                 login_close(lc);
1024 #endif
1025                 new_nomapped = new->se_nomapped;
1026                 for (sep = servtab; sep; sep = sep->se_next)
1027                         if (strcmp(sep->se_service, new->se_service) == 0 &&
1028                             strcmp(sep->se_proto, new->se_proto) == 0 &&
1029                             sep->se_rpc == new->se_rpc &&
1030                             sep->se_socktype == new->se_socktype &&
1031                             sep->se_family == new->se_family)
1032                                 break;
1033                 if (sep != 0) {
1034                         int i;
1035
1036 #define SWAP(t,a, b) { t c = a; a = b; b = c; }
1037                         omask = sigblock(SIGBLOCK);
1038                         if (sep->se_nomapped != new->se_nomapped) {
1039                                 /* for rpc keep old nommaped till unregister */
1040                                 if (!sep->se_rpc)
1041                                         sep->se_nomapped = new->se_nomapped;
1042                                 sep->se_reset = 1;
1043                         }
1044
1045                         /*
1046                          * The children tracked remain; we want numchild to
1047                          * still reflect how many jobs are running so we don't
1048                          * throw off our accounting.
1049                          */
1050                         sep->se_maxcpm = new->se_maxcpm;
1051                         sep->se_maxchild = new->se_maxchild;
1052                         resize_conn(sep, new->se_maxperip);
1053                         sep->se_maxperip = new->se_maxperip;
1054                         sep->se_bi = new->se_bi;
1055                         /* might need to turn on or off service now */
1056                         if (sep->se_fd >= 0) {
1057                               if (SERVTAB_EXCEEDS_LIMIT(sep)) {
1058                                       if (FD_ISSET(sep->se_fd, &allsock))
1059                                           disable(sep);
1060                               } else {
1061                                       if (!FD_ISSET(sep->se_fd, &allsock))
1062                                           enable(sep);
1063                               }
1064                         }
1065                         sep->se_accept = new->se_accept;
1066                         SWAP(char *, sep->se_user, new->se_user);
1067                         SWAP(char *, sep->se_group, new->se_group);
1068 #ifdef LOGIN_CAP
1069                         SWAP(char *, sep->se_class, new->se_class);
1070 #endif
1071                         SWAP(char *, sep->se_server, new->se_server);
1072                         SWAP(char *, sep->se_server_name, new->se_server_name);
1073                         for (i = 0; i < MAXARGV; i++)
1074                                 SWAP(char *, sep->se_argv[i], new->se_argv[i]);
1075 #ifdef IPSEC
1076                         SWAP(char *, sep->se_policy, new->se_policy);
1077                         ipsecsetup(sep);
1078 #endif
1079                         sigsetmask(omask);
1080                         freeconfig(new);
1081                         if (debug)
1082                                 print_service("REDO", sep);
1083                 } else {
1084                         sep = enter(new);
1085                         if (debug)
1086                                 print_service("ADD ", sep);
1087                 }
1088                 sep->se_checked = 1;
1089                 if (ISMUX(sep)) {
1090                         sep->se_fd = -1;
1091                         continue;
1092                 }
1093                 switch (sep->se_family) {
1094                 case AF_INET:
1095                         if (!v4bind_ok) {
1096                                 sep->se_fd = -1;
1097                                 continue;
1098                         }
1099                         break;
1100 #ifdef INET6
1101                 case AF_INET6:
1102                         if (!v6bind_ok) {
1103                                 sep->se_fd = -1;
1104                                 continue;
1105                         }
1106                         break;
1107 #endif
1108                 }
1109                 if (!sep->se_rpc) {
1110                         if (sep->se_family != AF_UNIX) {
1111                                 sp = getservbyname(sep->se_service, sep->se_proto);
1112                                 if (sp == 0) {
1113                                         syslog(LOG_ERR, "%s/%s: unknown service",
1114                                         sep->se_service, sep->se_proto);
1115                                         sep->se_checked = 0;
1116                                         continue;
1117                                 }
1118                         }
1119                         switch (sep->se_family) {
1120                         case AF_INET:
1121                                 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1122                                         sep->se_ctrladdr4.sin_port =
1123                                                 sp->s_port;
1124                                         sep->se_reset = 1;
1125                                 }
1126                                 break;
1127 #ifdef INET6
1128                         case AF_INET6:
1129                                 if (sp->s_port !=
1130                                     sep->se_ctrladdr6.sin6_port) {
1131                                         sep->se_ctrladdr6.sin6_port =
1132                                                 sp->s_port;
1133                                         sep->se_reset = 1;
1134                                 }
1135                                 break;
1136 #endif
1137                         }
1138                         if (sep->se_reset != 0 && sep->se_fd >= 0)
1139                                 close_sep(sep);
1140                 } else {
1141                         rpc = getrpcbyname(sep->se_service);
1142                         if (rpc == 0) {
1143                                 syslog(LOG_ERR, "%s/%s unknown RPC service",
1144                                         sep->se_service, sep->se_proto);
1145                                 if (sep->se_fd != -1)
1146                                         (void) close(sep->se_fd);
1147                                 sep->se_fd = -1;
1148                                         continue;
1149                         }
1150                         if (sep->se_reset != 0 ||
1151                             rpc->r_number != sep->se_rpc_prog) {
1152                                 if (sep->se_rpc_prog)
1153                                         unregisterrpc(sep);
1154                                 sep->se_rpc_prog = rpc->r_number;
1155                                 if (sep->se_fd != -1)
1156                                         (void) close(sep->se_fd);
1157                                 sep->se_fd = -1;
1158                         }
1159                         sep->se_nomapped = new_nomapped;
1160                 }
1161                 sep->se_reset = 0;
1162                 if (sep->se_fd == -1)
1163                         setup(sep);
1164         }
1165         endconfig();
1166         /*
1167          * Purge anything not looked at above.
1168          */
1169         omask = sigblock(SIGBLOCK);
1170         sepp = &servtab;
1171         while ((sep = *sepp)) {
1172                 if (sep->se_checked) {
1173                         sepp = &sep->se_next;
1174                         continue;
1175                 }
1176                 *sepp = sep->se_next;
1177                 if (sep->se_fd >= 0)
1178                         close_sep(sep);
1179                 if (debug)
1180                         print_service("FREE", sep);
1181                 if (sep->se_rpc && sep->se_rpc_prog > 0)
1182                         unregisterrpc(sep);
1183                 freeconfig(sep);
1184                 free(sep);
1185         }
1186         (void) sigsetmask(omask);
1187 }
1188
1189 static void
1190 unregisterrpc(struct servtab *sep)
1191 {
1192         u_int i;
1193         struct servtab *sepp;
1194         long omask;
1195         struct netconfig *netid4, *netid6;
1196
1197         omask = sigblock(SIGBLOCK);
1198         netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf;
1199         netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf;
1200         if (sep->se_family == AF_INET)
1201                 netid6 = NULL;
1202         else if (sep->se_nomapped)
1203                 netid4 = NULL;
1204         /*
1205          * Conflict if same prog and protocol - In that case one should look
1206          * to versions, but it is not interesting: having separate servers for
1207          * different versions does not work well.
1208          * Therefore one do not unregister if there is a conflict.
1209          * There is also transport conflict if destroying INET when INET46
1210          * exists, or destroying INET46 when INET exists
1211          */
1212         for (sepp = servtab; sepp; sepp = sepp->se_next) {
1213                 if (sepp == sep)
1214                         continue;
1215                 if (sepp->se_checked == 0 ||
1216                     !sepp->se_rpc ||
1217                     strcmp(sep->se_proto, sepp->se_proto) != 0 ||
1218                     sep->se_rpc_prog != sepp->se_rpc_prog)
1219                         continue;
1220                 if (sepp->se_family == AF_INET)
1221                         netid4 = NULL;
1222                 if (sepp->se_family == AF_INET6) {
1223                         netid6 = NULL;
1224                         if (!sep->se_nomapped)
1225                                 netid4 = NULL;
1226                 }
1227                 if (netid4 == NULL && netid6 == NULL)
1228                         return;
1229         }
1230         if (debug)
1231                 print_service("UNREG", sep);
1232         for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1233                 if (netid4)
1234                         rpcb_unset(sep->se_rpc_prog, i, netid4);
1235                 if (netid6)
1236                         rpcb_unset(sep->se_rpc_prog, i, netid6);
1237         }
1238         if (sep->se_fd != -1)
1239                 (void) close(sep->se_fd);
1240         sep->se_fd = -1;
1241         (void) sigsetmask(omask);
1242 }
1243
1244 static void
1245 retry(void)
1246 {
1247         struct servtab *sep;
1248
1249         timingout = 0;
1250         for (sep = servtab; sep; sep = sep->se_next)
1251                 if (sep->se_fd == -1 && !ISMUX(sep))
1252                         setup(sep);
1253 }
1254
1255 static void
1256 setup(struct servtab *sep)
1257 {
1258         int on = 1;
1259
1260         /* Set all listening sockets to close-on-exec. */
1261         if ((sep->se_fd = socket(sep->se_family,
1262             sep->se_socktype | SOCK_CLOEXEC, 0)) < 0) {
1263                 if (debug)
1264                         warn("socket failed on %s/%s",
1265                                 sep->se_service, sep->se_proto);
1266                 syslog(LOG_ERR, "%s/%s: socket: %m",
1267                     sep->se_service, sep->se_proto);
1268                 return;
1269         }
1270 #define turnon(fd, opt) \
1271 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1272         if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1273             turnon(sep->se_fd, SO_DEBUG) < 0)
1274                 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1275         if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1276                 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1277 #ifdef SO_PRIVSTATE
1278         if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1279                 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1280 #endif
1281         /* tftpd opens a new connection then needs more infos */
1282 #ifdef INET6
1283         if ((sep->se_family == AF_INET6) &&
1284             (strcmp(sep->se_proto, "udp") == 0) &&
1285             (sep->se_accept == 0) &&
1286             (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
1287                         (char *)&on, sizeof (on)) < 0))
1288                 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1289         if (sep->se_family == AF_INET6) {
1290                 int flag = sep->se_nomapped ? 1 : 0;
1291                 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1292                                (char *)&flag, sizeof (flag)) < 0)
1293                         syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1294         }
1295 #endif
1296 #undef turnon
1297 #ifdef IPSEC
1298         ipsecsetup(sep);
1299 #endif
1300         if (sep->se_family == AF_UNIX) {
1301                 (void) unlink(sep->se_ctrladdr_un.sun_path);
1302                 umask(0777); /* Make socket with conservative permissions */
1303         }
1304         if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1305             sep->se_ctrladdr_size) < 0) {
1306                 if (debug)
1307                         warn("bind failed on %s/%s",
1308                                 sep->se_service, sep->se_proto);
1309                 syslog(LOG_ERR, "%s/%s: bind: %m",
1310                     sep->se_service, sep->se_proto);
1311                 (void) close(sep->se_fd);
1312                 sep->se_fd = -1;
1313                 if (!timingout) {
1314                         timingout = 1;
1315                         alarm(RETRYTIME);
1316                 }
1317                 if (sep->se_family == AF_UNIX)
1318                         umask(mask);
1319                 return;
1320         }
1321         if (sep->se_family == AF_UNIX) {
1322                 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1323                 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1324                         syslog(LOG_ERR, "chown socket: %m");
1325                 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1326                         syslog(LOG_ERR, "chmod socket: %m");
1327                 umask(mask);
1328         }
1329         if (sep->se_rpc) {
1330                 u_int i;
1331                 socklen_t len = sep->se_ctrladdr_size;
1332                 struct netconfig *netid, *netid2 = NULL;
1333 #ifdef INET6
1334                 struct sockaddr_in sock;
1335 #endif
1336                 struct netbuf nbuf, nbuf2;
1337
1338                 if (getsockname(sep->se_fd,
1339                                 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1340                         syslog(LOG_ERR, "%s/%s: getsockname: %m",
1341                                sep->se_service, sep->se_proto);
1342                         (void) close(sep->se_fd);
1343                         sep->se_fd = -1;
1344                         return;
1345                 }
1346                 nbuf.buf = &sep->se_ctrladdr;
1347                 nbuf.len = sep->se_ctrladdr.sa_len;
1348                 if (sep->se_family == AF_INET)
1349                         netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf;
1350 #ifdef INET6
1351                 else  {
1352                         netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf;
1353                         if (!sep->se_nomapped) { /* INET and INET6 */
1354                                 netid2 = netid==udp6conf? udpconf:tcpconf;
1355                                 memset(&sock, 0, sizeof sock);  /* ADDR_ANY */
1356                                 nbuf2.buf = &sock;
1357                                 nbuf2.len = sock.sin_len = sizeof sock;
1358                                 sock.sin_family = AF_INET;
1359                                 sock.sin_port = sep->se_ctrladdr6.sin6_port;
1360                         }
1361                 }
1362 #else
1363                 else {
1364                         syslog(LOG_ERR,
1365                             "%s/%s: inetd compiled without inet6 support\n",
1366                             sep->se_service, sep->se_proto);
1367                         (void) close(sep->se_fd);
1368                         sep->se_fd = -1;
1369                         return;
1370                 }
1371 #endif
1372                 if (debug)
1373                         print_service("REG ", sep);
1374                 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1375                         rpcb_unset(sep->se_rpc_prog, i, netid);
1376                         rpcb_set(sep->se_rpc_prog, i, netid, &nbuf);
1377                         if (netid2) {
1378                                 rpcb_unset(sep->se_rpc_prog, i, netid2);
1379                                 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2);
1380                         }
1381                 }
1382         }
1383         if (sep->se_socktype == SOCK_STREAM)
1384                 listen(sep->se_fd, -1);
1385         enable(sep);
1386         if (debug) {
1387                 warnx("registered %s on %d",
1388                         sep->se_server, sep->se_fd);
1389         }
1390 }
1391
1392 #ifdef IPSEC
1393 static void
1394 ipsecsetup(struct servtab *sep)
1395 {
1396         char *buf;
1397         char *policy_in = NULL;
1398         char *policy_out = NULL;
1399         int level;
1400         int opt;
1401
1402         switch (sep->se_family) {
1403         case AF_INET:
1404                 level = IPPROTO_IP;
1405                 opt = IP_IPSEC_POLICY;
1406                 break;
1407 #ifdef INET6
1408         case AF_INET6:
1409                 level = IPPROTO_IPV6;
1410                 opt = IPV6_IPSEC_POLICY;
1411                 break;
1412 #endif
1413         default:
1414                 return;
1415         }
1416
1417         if (!sep->se_policy || sep->se_policy[0] == '\0') {
1418                 static char def_in[] = "in entrust", def_out[] = "out entrust";
1419                 policy_in = def_in;
1420                 policy_out = def_out;
1421         } else {
1422                 if (!strncmp("in", sep->se_policy, 2))
1423                         policy_in = sep->se_policy;
1424                 else if (!strncmp("out", sep->se_policy, 3))
1425                         policy_out = sep->se_policy;
1426                 else {
1427                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1428                                 sep->se_policy);
1429                         return;
1430                 }
1431         }
1432
1433         if (policy_in != NULL) {
1434                 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1435                 if (buf != NULL) {
1436                         if (setsockopt(sep->se_fd, level, opt,
1437                                         buf, ipsec_get_policylen(buf)) < 0 &&
1438                             debug != 0)
1439                                 warnx("%s/%s: ipsec initialization failed; %s",
1440                                       sep->se_service, sep->se_proto,
1441                                       policy_in);
1442                         free(buf);
1443                 } else
1444                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1445                                 policy_in);
1446         }
1447         if (policy_out != NULL) {
1448                 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1449                 if (buf != NULL) {
1450                         if (setsockopt(sep->se_fd, level, opt,
1451                                         buf, ipsec_get_policylen(buf)) < 0 &&
1452                             debug != 0)
1453                                 warnx("%s/%s: ipsec initialization failed; %s",
1454                                       sep->se_service, sep->se_proto,
1455                                       policy_out);
1456                         free(buf);
1457                 } else
1458                         syslog(LOG_ERR, "invalid security policy \"%s\"",
1459                                 policy_out);
1460         }
1461 }
1462 #endif
1463
1464 /*
1465  * Finish with a service and its socket.
1466  */
1467 static void
1468 close_sep(struct servtab *sep)
1469 {
1470         if (sep->se_fd >= 0) {
1471                 if (FD_ISSET(sep->se_fd, &allsock))
1472                         disable(sep);
1473                 (void) close(sep->se_fd);
1474                 sep->se_fd = -1;
1475         }
1476         sep->se_count = 0;
1477         sep->se_numchild = 0;   /* forget about any existing children */
1478 }
1479
1480 static int
1481 matchservent(const char *name1, const char *name2, const char *proto)
1482 {
1483         char **alias, *p;
1484         struct servent *se;
1485
1486         if (strcmp(proto, "unix") == 0) {
1487                 if ((p = strrchr(name1, '/')) != NULL)
1488                         name1 = p + 1;
1489                 if ((p = strrchr(name2, '/')) != NULL)
1490                         name2 = p + 1;
1491         }
1492         if (strcmp(name1, name2) == 0)
1493                 return(1);
1494         if ((se = getservbyname(name1, proto)) != NULL) {
1495                 if (strcmp(name2, se->s_name) == 0)
1496                         return(1);
1497                 for (alias = se->s_aliases; *alias; alias++)
1498                         if (strcmp(name2, *alias) == 0)
1499                                 return(1);
1500         }
1501         return(0);
1502 }
1503
1504 static struct servtab *
1505 enter(struct servtab *cp)
1506 {
1507         struct servtab *sep;
1508         long omask;
1509
1510         sep = malloc(sizeof(*sep));
1511         if (sep == NULL) {
1512                 syslog(LOG_ERR, "malloc: %m");
1513                 exit(EX_OSERR);
1514         }
1515         *sep = *cp;
1516         sep->se_fd = -1;
1517         omask = sigblock(SIGBLOCK);
1518         sep->se_next = servtab;
1519         servtab = sep;
1520         sigsetmask(omask);
1521         return (sep);
1522 }
1523
1524 static void
1525 enable(struct servtab *sep)
1526 {
1527         if (debug)
1528                 warnx(
1529                     "enabling %s, fd %d", sep->se_service, sep->se_fd);
1530 #ifdef SANITY_CHECK
1531         if (sep->se_fd < 0) {
1532                 syslog(LOG_ERR,
1533                     "%s: %s: bad fd", __func__, sep->se_service);
1534                 exit(EX_SOFTWARE);
1535         }
1536         if (ISMUX(sep)) {
1537                 syslog(LOG_ERR,
1538                     "%s: %s: is mux", __func__, sep->se_service);
1539                 exit(EX_SOFTWARE);
1540         }
1541         if (FD_ISSET(sep->se_fd, &allsock)) {
1542                 syslog(LOG_ERR,
1543                     "%s: %s: not off", __func__, sep->se_service);
1544                 exit(EX_SOFTWARE);
1545         }
1546         nsock++;
1547 #endif
1548         FD_SET(sep->se_fd, &allsock);
1549         maxsock = MAX(maxsock, sep->se_fd);
1550 }
1551
1552 static void
1553 disable(struct servtab *sep)
1554 {
1555         if (debug)
1556                 warnx(
1557                     "disabling %s, fd %d", sep->se_service, sep->se_fd);
1558 #ifdef SANITY_CHECK
1559         if (sep->se_fd < 0) {
1560                 syslog(LOG_ERR,
1561                     "%s: %s: bad fd", __func__, sep->se_service);
1562                 exit(EX_SOFTWARE);
1563         }
1564         if (ISMUX(sep)) {
1565                 syslog(LOG_ERR,
1566                     "%s: %s: is mux", __func__, sep->se_service);
1567                 exit(EX_SOFTWARE);
1568         }
1569         if (!FD_ISSET(sep->se_fd, &allsock)) {
1570                 syslog(LOG_ERR,
1571                     "%s: %s: not on", __func__, sep->se_service);
1572                 exit(EX_SOFTWARE);
1573         }
1574         if (nsock == 0) {
1575                 syslog(LOG_ERR, "%s: nsock=0", __func__);
1576                 exit(EX_SOFTWARE);
1577         }
1578         nsock--;
1579 #endif
1580         FD_CLR(sep->se_fd, &allsock);
1581         if (sep->se_fd == maxsock)
1582                 maxsock--;
1583 }
1584
1585 static FILE     *fconfig = NULL;
1586 static struct   servtab serv;
1587 static char     line[LINE_MAX];
1588
1589 static int
1590 setconfig(void)
1591 {
1592
1593         if (fconfig != NULL) {
1594                 fseek(fconfig, 0L, SEEK_SET);
1595                 return (1);
1596         }
1597         fconfig = fopen(CONFIG, "r");
1598         return (fconfig != NULL);
1599 }
1600
1601 static void
1602 endconfig(void)
1603 {
1604         if (fconfig) {
1605                 (void) fclose(fconfig);
1606                 fconfig = NULL;
1607         }
1608 }
1609
1610 static struct servtab *
1611 getconfigent(void)
1612 {
1613         struct servtab *sep = &serv;
1614         int argc;
1615         char *cp, *arg, *s;
1616         char *versp;
1617         static char TCPMUX_TOKEN[] = "tcpmux/";
1618 #define MUX_LEN         (sizeof(TCPMUX_TOKEN)-1)
1619 #ifdef IPSEC
1620         char *policy;
1621 #endif
1622 #ifdef INET6
1623         int v4bind;
1624         int v6bind;
1625 #endif
1626         int i;
1627         size_t unsz;
1628
1629 #ifdef IPSEC
1630         policy = NULL;
1631 #endif
1632 more:
1633 #ifdef INET6
1634         v4bind = 0;
1635         v6bind = 0;
1636 #endif
1637         while ((cp = nextline(fconfig)) != NULL) {
1638 #ifdef IPSEC
1639                 /* lines starting with #@ is not a comment, but the policy */
1640                 if (cp[0] == '#' && cp[1] == '@') {
1641                         char *p;
1642                         for (p = cp + 2; p && *p && isspace(*p); p++)
1643                                 ;
1644                         if (*p == '\0') {
1645                                 free(policy);
1646                                 policy = NULL;
1647                         } else if (ipsec_get_policylen(p) >= 0) {
1648                                 free(policy);
1649                                 policy = newstr(p);
1650                         } else {
1651                                 syslog(LOG_ERR,
1652                                         "%s: invalid ipsec policy \"%s\"",
1653                                         CONFIG, p);
1654                                 exit(EX_CONFIG);
1655                         }
1656                 }
1657 #endif
1658                 if (*cp == '#' || *cp == '\0')
1659                         continue;
1660                 break;
1661         }
1662         if (cp == NULL) {
1663 #ifdef IPSEC
1664                 free(policy);
1665 #endif
1666                 return (NULL);
1667         }
1668
1669         /*
1670          * clear the static buffer, since some fields (se_ctrladdr,
1671          * for example) don't get initialized here.
1672          */
1673         memset(sep, 0, sizeof *sep);
1674         arg = skip(&cp);
1675         if (cp == NULL) {
1676                 /* got an empty line containing just blanks/tabs. */
1677                 goto more;
1678         }
1679         if (arg[0] == ':') { /* :user:group:perm: */
1680                 char *user, *group, *perm;
1681                 struct passwd *pw;
1682                 struct group *gr;
1683                 user = arg+1;
1684                 if ((group = strchr(user, ':')) == NULL) {
1685                         syslog(LOG_ERR, "no group after user '%s'", user);
1686                         goto more;
1687                 }
1688                 *group++ = '\0';
1689                 if ((perm = strchr(group, ':')) == NULL) {
1690                         syslog(LOG_ERR, "no mode after group '%s'", group);
1691                         goto more;
1692                 }
1693                 *perm++ = '\0';
1694                 if ((pw = getpwnam(user)) == NULL) {
1695                         syslog(LOG_ERR, "no such user '%s'", user);
1696                         goto more;
1697                 }
1698                 sep->se_sockuid = pw->pw_uid;
1699                 if ((gr = getgrnam(group)) == NULL) {
1700                         syslog(LOG_ERR, "no such user '%s'", group);
1701                         goto more;
1702                 }
1703                 sep->se_sockgid = gr->gr_gid;
1704                 sep->se_sockmode = strtol(perm, &arg, 8);
1705                 if (*arg != ':') {
1706                         syslog(LOG_ERR, "bad mode '%s'", perm);
1707                         goto more;
1708                 }
1709                 *arg++ = '\0';
1710         } else {
1711                 sep->se_sockuid = euid;
1712                 sep->se_sockgid = egid;
1713                 sep->se_sockmode = 0200;
1714         }
1715         if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1716                 char *c = arg + MUX_LEN;
1717                 if (*c == '+') {
1718                         sep->se_type = MUXPLUS_TYPE;
1719                         c++;
1720                 } else
1721                         sep->se_type = MUX_TYPE;
1722                 sep->se_service = newstr(c);
1723         } else {
1724                 sep->se_service = newstr(arg);
1725                 sep->se_type = NORM_TYPE;
1726         }
1727         arg = sskip(&cp);
1728         if (strcmp(arg, "stream") == 0)
1729                 sep->se_socktype = SOCK_STREAM;
1730         else if (strcmp(arg, "dgram") == 0)
1731                 sep->se_socktype = SOCK_DGRAM;
1732         else if (strcmp(arg, "rdm") == 0)
1733                 sep->se_socktype = SOCK_RDM;
1734         else if (strcmp(arg, "seqpacket") == 0)
1735                 sep->se_socktype = SOCK_SEQPACKET;
1736         else if (strcmp(arg, "raw") == 0)
1737                 sep->se_socktype = SOCK_RAW;
1738         else
1739                 sep->se_socktype = -1;
1740
1741         arg = sskip(&cp);
1742         if (strncmp(arg, "tcp", 3) == 0) {
1743                 sep->se_proto = newstr(strsep(&arg, "/"));
1744                 if (arg != NULL && (strcmp(arg, "faith") == 0)) {
1745                         syslog(LOG_ERR, "faith has been deprecated");
1746                         goto more;
1747                 }
1748         } else {
1749                 if (sep->se_type == NORM_TYPE &&
1750                     strncmp(arg, "faith/", 6) == 0) {
1751                         syslog(LOG_ERR, "faith has been deprecated");
1752                         goto more;
1753                 }
1754                 sep->se_proto = newstr(arg);
1755         }
1756         if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1757                 memmove(sep->se_proto, sep->se_proto + 4,
1758                     strlen(sep->se_proto) + 1 - 4);
1759                 sep->se_rpc = 1;
1760                 sep->se_rpc_prog = sep->se_rpc_lowvers =
1761                         sep->se_rpc_highvers = 0;
1762                 if ((versp = strrchr(sep->se_service, '/'))) {
1763                         *versp++ = '\0';
1764                         switch (sscanf(versp, "%u-%u",
1765                                        &sep->se_rpc_lowvers,
1766                                        &sep->se_rpc_highvers)) {
1767                         case 2:
1768                                 break;
1769                         case 1:
1770                                 sep->se_rpc_highvers =
1771                                         sep->se_rpc_lowvers;
1772                                 break;
1773                         default:
1774                                 syslog(LOG_ERR,
1775                                         "bad RPC version specifier; %s",
1776                                         sep->se_service);
1777                                 freeconfig(sep);
1778                                 goto more;
1779                         }
1780                 }
1781                 else {
1782                         sep->se_rpc_lowvers =
1783                                 sep->se_rpc_highvers = 1;
1784                 }
1785         }
1786         sep->se_nomapped = 0;
1787         if (strcmp(sep->se_proto, "unix") == 0) {
1788                 sep->se_family = AF_UNIX;
1789         } else {
1790                 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1791 #ifdef INET6
1792                         if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1793                                 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1794                                 v6bind = 1;
1795                                 continue;
1796                         }
1797 #endif
1798                         if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1799                                 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1800 #ifdef INET6
1801                                 v4bind = 1;
1802 #endif
1803                                 continue;
1804                         }
1805                         /* illegal version num */
1806                         syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1807                         freeconfig(sep);
1808                         goto more;
1809                 }
1810 #ifdef INET6
1811                 if (v6bind && !v6bind_ok) {
1812                         syslog(LOG_INFO, "IPv6 bind is ignored for %s",
1813                                sep->se_service);
1814                         if (v4bind && v4bind_ok)
1815                                 v6bind = 0;
1816                         else {
1817                                 freeconfig(sep);
1818                                 goto more;
1819                         }
1820                 }
1821                 if (v6bind) {
1822                         sep->se_family = AF_INET6;
1823                         if (!v4bind || !v4bind_ok)
1824                                 sep->se_nomapped = 1;
1825                 } else
1826 #endif
1827                 { /* default to v4 bind if not v6 bind */
1828                         if (!v4bind_ok) {
1829                                 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1830                                        sep->se_service);
1831                                 freeconfig(sep);
1832                                 goto more;
1833                         }
1834                         sep->se_family = AF_INET;
1835                 }
1836         }
1837         /* init ctladdr */
1838         switch(sep->se_family) {
1839         case AF_INET:
1840                 memcpy(&sep->se_ctrladdr4, bind_sa4,
1841                        sizeof(sep->se_ctrladdr4));
1842                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1843                 break;
1844 #ifdef INET6
1845         case AF_INET6:
1846                 memcpy(&sep->se_ctrladdr6, bind_sa6,
1847                        sizeof(sep->se_ctrladdr6));
1848                 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1849                 break;
1850 #endif
1851         case AF_UNIX:
1852 #define SUN_PATH_MAXSIZE        sizeof(sep->se_ctrladdr_un.sun_path)
1853                 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1854                 sep->se_ctrladdr_un.sun_family = sep->se_family;
1855                 if ((unsz = strlcpy(sep->se_ctrladdr_un.sun_path,
1856                     sep->se_service, SUN_PATH_MAXSIZE) >= SUN_PATH_MAXSIZE)) {
1857                         syslog(LOG_ERR,
1858                             "domain socket pathname too long for service %s",
1859                             sep->se_service);
1860                         goto more;
1861                 }
1862                 sep->se_ctrladdr_un.sun_len = unsz;
1863 #undef SUN_PATH_MAXSIZE
1864                 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1865         }
1866         arg = sskip(&cp);
1867         if (!strncmp(arg, "wait", 4))
1868                 sep->se_accept = 0;
1869         else if (!strncmp(arg, "nowait", 6))
1870                 sep->se_accept = 1;
1871         else {
1872                 syslog(LOG_ERR,
1873                         "%s: bad wait/nowait for service %s",
1874                         CONFIG, sep->se_service);
1875                 goto more;
1876         }
1877         sep->se_maxchild = -1;
1878         sep->se_maxcpm = -1;
1879         sep->se_maxperip = -1;
1880         if ((s = strchr(arg, '/')) != NULL) {
1881                 char *eptr;
1882                 u_long val;
1883
1884                 val = strtoul(s + 1, &eptr, 10);
1885                 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1886                         syslog(LOG_ERR,
1887                                 "%s: bad max-child for service %s",
1888                                 CONFIG, sep->se_service);
1889                         goto more;
1890                 }
1891                 if (debug)
1892                         if (!sep->se_accept && val != 1)
1893                                 warnx("maxchild=%lu for wait service %s"
1894                                     " not recommended", val, sep->se_service);
1895                 sep->se_maxchild = val;
1896                 if (*eptr == '/')
1897                         sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1898                 if (*eptr == '/')
1899                         sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1900                 /*
1901                  * explicitly do not check for \0 for future expansion /
1902                  * backwards compatibility
1903                  */
1904         }
1905         if (ISMUX(sep)) {
1906                 /*
1907                  * Silently enforce "nowait" mode for TCPMUX services
1908                  * since they don't have an assigned port to listen on.
1909                  */
1910                 sep->se_accept = 1;
1911                 if (strcmp(sep->se_proto, "tcp")) {
1912                         syslog(LOG_ERR,
1913                                 "%s: bad protocol for tcpmux service %s",
1914                                 CONFIG, sep->se_service);
1915                         goto more;
1916                 }
1917                 if (sep->se_socktype != SOCK_STREAM) {
1918                         syslog(LOG_ERR,
1919                                 "%s: bad socket type for tcpmux service %s",
1920                                 CONFIG, sep->se_service);
1921                         goto more;
1922                 }
1923         }
1924         sep->se_user = newstr(sskip(&cp));
1925 #ifdef LOGIN_CAP
1926         if ((s = strrchr(sep->se_user, '/')) != NULL) {
1927                 *s = '\0';
1928                 sep->se_class = newstr(s + 1);
1929         } else
1930                 sep->se_class = newstr(RESOURCE_RC);
1931 #endif
1932         if ((s = strrchr(sep->se_user, ':')) != NULL) {
1933                 *s = '\0';
1934                 sep->se_group = newstr(s + 1);
1935         } else
1936                 sep->se_group = NULL;
1937         sep->se_server = newstr(sskip(&cp));
1938         if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1939                 sep->se_server_name++;
1940         if (strcmp(sep->se_server, "internal") == 0) {
1941                 struct biltin *bi;
1942
1943                 for (bi = biltins; bi->bi_service; bi++)
1944                         if (bi->bi_socktype == sep->se_socktype &&
1945                             matchservent(bi->bi_service, sep->se_service,
1946                             sep->se_proto))
1947                                 break;
1948                 if (bi->bi_service == 0) {
1949                         syslog(LOG_ERR, "internal service %s unknown",
1950                                 sep->se_service);
1951                         goto more;
1952                 }
1953                 sep->se_accept = 1;     /* force accept mode for built-ins */
1954                 sep->se_bi = bi;
1955         } else
1956                 sep->se_bi = NULL;
1957         if (sep->se_maxperip < 0)
1958                 sep->se_maxperip = maxperip;
1959         if (sep->se_maxcpm < 0)
1960                 sep->se_maxcpm = maxcpm;
1961         if (sep->se_maxchild < 0) {     /* apply default max-children */
1962                 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1963                         sep->se_maxchild = sep->se_bi->bi_maxchild;
1964                 else if (sep->se_accept)
1965                         sep->se_maxchild = MAX(maxchild, 0);
1966                 else
1967                         sep->se_maxchild = 1;
1968         }
1969         LIST_INIT(&sep->se_children);
1970         argc = 0;
1971         for (arg = skip(&cp); cp; arg = skip(&cp))
1972                 if (argc < MAXARGV) {
1973                         sep->se_argv[argc++] = newstr(arg);
1974                 } else {
1975                         syslog(LOG_ERR,
1976                                 "%s: too many arguments for service %s",
1977                                 CONFIG, sep->se_service);
1978                         goto more;
1979                 }
1980         while (argc <= MAXARGV)
1981                 sep->se_argv[argc++] = NULL;
1982         for (i = 0; i < PERIPSIZE; ++i)
1983                 LIST_INIT(&sep->se_conn[i]);
1984 #ifdef IPSEC
1985         sep->se_policy = policy ? newstr(policy) : NULL;
1986         free(policy);
1987 #endif
1988         return (sep);
1989 }
1990
1991 static void
1992 freeconfig(struct servtab *cp)
1993 {
1994         struct stabchild *sc;
1995         int i;
1996
1997         free(cp->se_service);
1998         free(cp->se_proto);
1999         free(cp->se_user);
2000         free(cp->se_group);
2001 #ifdef LOGIN_CAP
2002         free(cp->se_class);
2003 #endif
2004         free(cp->se_server);
2005         while (!LIST_EMPTY(&cp->se_children)) {
2006                 sc = LIST_FIRST(&cp->se_children);
2007                 LIST_REMOVE(sc, sc_link);
2008                 free(sc);
2009         }
2010         for (i = 0; i < MAXARGV; i++)
2011                 if (cp->se_argv[i])
2012                         free(cp->se_argv[i]);
2013         free_connlist(cp);
2014 #ifdef IPSEC
2015         free(cp->se_policy);
2016 #endif
2017 }
2018
2019
2020 /*
2021  * Safe skip - if skip returns null, log a syntax error in the
2022  * configuration file and exit.
2023  */
2024 static char *
2025 sskip(char **cpp)
2026 {
2027         char *cp;
2028
2029         cp = skip(cpp);
2030         if (cp == NULL) {
2031                 syslog(LOG_ERR, "%s: syntax error", CONFIG);
2032                 exit(EX_DATAERR);
2033         }
2034         return (cp);
2035 }
2036
2037 static char *
2038 skip(char **cpp)
2039 {
2040         char *cp = *cpp;
2041         char *start;
2042         char quote = '\0';
2043
2044 again:
2045         while (*cp == ' ' || *cp == '\t')
2046                 cp++;
2047         if (*cp == '\0') {
2048                 int c;
2049
2050                 c = getc(fconfig);
2051                 (void) ungetc(c, fconfig);
2052                 if (c == ' ' || c == '\t')
2053                         if ((cp = nextline(fconfig)))
2054                                 goto again;
2055                 *cpp = (char *)0;
2056                 return ((char *)0);
2057         }
2058         if (*cp == '"' || *cp == '\'')
2059                 quote = *cp++;
2060         start = cp;
2061         if (quote)
2062                 while (*cp && *cp != quote)
2063                         cp++;
2064         else
2065                 while (*cp && *cp != ' ' && *cp != '\t')
2066                         cp++;
2067         if (*cp != '\0')
2068                 *cp++ = '\0';
2069         *cpp = cp;
2070         return (start);
2071 }
2072
2073 static char *
2074 nextline(FILE *fd)
2075 {
2076         char *cp;
2077
2078         if (fgets(line, sizeof (line), fd) == NULL)
2079                 return ((char *)0);
2080         cp = strchr(line, '\n');
2081         if (cp)
2082                 *cp = '\0';
2083         return (line);
2084 }
2085
2086 static char *
2087 newstr(const char *cp)
2088 {
2089         char *cr;
2090
2091         if ((cr = strdup(cp != NULL ? cp : "")))
2092                 return (cr);
2093         syslog(LOG_ERR, "strdup: %m");
2094         exit(EX_OSERR);
2095 }
2096
2097 void
2098 inetd_setproctitle(const char *a, int s)
2099 {
2100         socklen_t size;
2101         struct sockaddr_storage ss;
2102         char buf[80], pbuf[NI_MAXHOST];
2103
2104         size = sizeof(ss);
2105         if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2106                 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2107                             NULL, 0, NI_NUMERICHOST);
2108                 (void) sprintf(buf, "%s [%s]", a, pbuf);
2109         } else
2110                 (void) sprintf(buf, "%s", a);
2111         setproctitle("%s", buf);
2112 }
2113
2114 int
2115 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2116 {
2117         struct servtab *se2;
2118         char pname[NI_MAXHOST];
2119
2120         for (se2 = servtab; se2; se2 = se2->se_next) {
2121                 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2122                         continue;
2123
2124                 switch (se2->se_family) {
2125                 case AF_INET:
2126                         if (csatosin(sa)->sin_port ==
2127                             se2->se_ctrladdr4.sin_port)
2128                                 goto isloop;
2129                         continue;
2130 #ifdef INET6
2131                 case AF_INET6:
2132                         if (csatosin6(sa)->sin6_port ==
2133                             se2->se_ctrladdr6.sin6_port)
2134                                 goto isloop;
2135                         continue;
2136 #endif
2137                 default:
2138                         continue;
2139                 }
2140         isloop:
2141                 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2142                             NI_NUMERICHOST);
2143                 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2144                        sep->se_service, sep->se_proto,
2145                        se2->se_service, se2->se_proto,
2146                        pname);
2147                 return 1;
2148         }
2149         return 0;
2150 }
2151
2152 /*
2153  * print_service:
2154  *      Dump relevant information to stderr
2155  */
2156 static void
2157 print_service(const char *action, const struct servtab *sep)
2158 {
2159         fprintf(stderr,
2160             "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2161 #ifdef LOGIN_CAP
2162             "class=%s"
2163 #endif
2164             " builtin=%p server=%s"
2165 #ifdef IPSEC
2166             " policy=\"%s\""
2167 #endif
2168             "\n",
2169             action, sep->se_service, sep->se_proto,
2170             sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2171 #ifdef LOGIN_CAP
2172             sep->se_class,
2173 #endif
2174             (void *) sep->se_bi, sep->se_server
2175 #ifdef IPSEC
2176             , (sep->se_policy ? sep->se_policy : "")
2177 #endif
2178             );
2179 }
2180
2181 #define CPMHSIZE        256
2182 #define CPMHMASK        (CPMHSIZE-1)
2183 #define CHTGRAN         10
2184 #define CHTSIZE         6
2185
2186 typedef struct CTime {
2187         unsigned long   ct_Ticks;
2188         int             ct_Count;
2189 } CTime;
2190
2191 typedef struct CHash {
2192         union {
2193                 struct in_addr  c4_Addr;
2194                 struct in6_addr c6_Addr;
2195         } cu_Addr;
2196 #define ch_Addr4        cu_Addr.c4_Addr
2197 #define ch_Addr6        cu_Addr.c6_Addr
2198         int             ch_Family;
2199         time_t          ch_LTime;
2200         char            *ch_Service;
2201         CTime           ch_Times[CHTSIZE];
2202 } CHash;
2203
2204 static CHash    CHashAry[CPMHSIZE];
2205
2206 static int
2207 cpmip(const struct servtab *sep, int ctrl)
2208 {
2209         struct sockaddr_storage rss;
2210         socklen_t rssLen = sizeof(rss);
2211         int r = 0;
2212
2213         /*
2214          * If getpeername() fails, just let it through (if logging is
2215          * enabled the condition is caught elsewhere)
2216          */
2217
2218         if (sep->se_maxcpm > 0 &&
2219            (sep->se_family == AF_INET || sep->se_family == AF_INET6) &&
2220             getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2221                 time_t t = time(NULL);
2222                 unsigned int hv = 0xABC3D20F;
2223                 int i;
2224                 int cnt = 0;
2225                 CHash *chBest = NULL;
2226                 unsigned int ticks = t / CHTGRAN;
2227                 struct sockaddr_in *sin4;
2228 #ifdef INET6
2229                 struct sockaddr_in6 *sin6;
2230 #endif
2231
2232                 sin4 = (struct sockaddr_in *)&rss;
2233 #ifdef INET6
2234                 sin6 = (struct sockaddr_in6 *)&rss;
2235 #endif
2236                 {
2237                         char *p;
2238                         int addrlen;
2239
2240                         switch (rss.ss_family) {
2241                         case AF_INET:
2242                                 p = (char *)&sin4->sin_addr;
2243                                 addrlen = sizeof(struct in_addr);
2244                                 break;
2245 #ifdef INET6
2246                         case AF_INET6:
2247                                 p = (char *)&sin6->sin6_addr;
2248                                 addrlen = sizeof(struct in6_addr);
2249                                 break;
2250 #endif
2251                         default:
2252                                 /* should not happen */
2253                                 return -1;
2254                         }
2255
2256                         for (i = 0; i < addrlen; ++i, ++p) {
2257                                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2258                         }
2259                         hv = (hv ^ (hv >> 16));
2260                 }
2261                 for (i = 0; i < 5; ++i) {
2262                         CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2263
2264                         if (rss.ss_family == AF_INET &&
2265                             ch->ch_Family == AF_INET &&
2266                             sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2267                             ch->ch_Service && strcmp(sep->se_service,
2268                             ch->ch_Service) == 0) {
2269                                 chBest = ch;
2270                                 break;
2271                         }
2272 #ifdef INET6
2273                         if (rss.ss_family == AF_INET6 &&
2274                             ch->ch_Family == AF_INET6 &&
2275                             IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2276                                                &ch->ch_Addr6) != 0 &&
2277                             ch->ch_Service && strcmp(sep->se_service,
2278                             ch->ch_Service) == 0) {
2279                                 chBest = ch;
2280                                 break;
2281                         }
2282 #endif
2283                         if (chBest == NULL || ch->ch_LTime == 0 ||
2284                             ch->ch_LTime < chBest->ch_LTime) {
2285                                 chBest = ch;
2286                         }
2287                 }
2288                 if ((rss.ss_family == AF_INET &&
2289                      (chBest->ch_Family != AF_INET ||
2290                       sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2291                     chBest->ch_Service == NULL ||
2292                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2293                         chBest->ch_Family = sin4->sin_family;
2294                         chBest->ch_Addr4 = sin4->sin_addr;
2295                         free(chBest->ch_Service);
2296                         chBest->ch_Service = strdup(sep->se_service);
2297                         memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times));
2298                 }
2299 #ifdef INET6
2300                 if ((rss.ss_family == AF_INET6 &&
2301                      (chBest->ch_Family != AF_INET6 ||
2302                       IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2303                                          &chBest->ch_Addr6) == 0)) ||
2304                     chBest->ch_Service == NULL ||
2305                     strcmp(sep->se_service, chBest->ch_Service) != 0) {
2306                         chBest->ch_Family = sin6->sin6_family;
2307                         chBest->ch_Addr6 = sin6->sin6_addr;
2308                         free(chBest->ch_Service);
2309                         chBest->ch_Service = strdup(sep->se_service);
2310                         memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times));
2311                 }
2312 #endif
2313                 chBest->ch_LTime = t;
2314                 {
2315                         CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2316                         if (ct->ct_Ticks != ticks) {
2317                                 ct->ct_Ticks = ticks;
2318                                 ct->ct_Count = 0;
2319                         }
2320                         ++ct->ct_Count;
2321                 }
2322                 for (i = 0; i < CHTSIZE; ++i) {
2323                         CTime *ct = &chBest->ch_Times[i];
2324                         if (ct->ct_Ticks <= ticks &&
2325                             ct->ct_Ticks >= ticks - CHTSIZE) {
2326                                 cnt += ct->ct_Count;
2327                         }
2328                 }
2329                 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) {
2330                         char pname[NI_MAXHOST];
2331
2332                         getnameinfo((struct sockaddr *)&rss,
2333                                     ((struct sockaddr *)&rss)->sa_len,
2334                                     pname, sizeof(pname), NULL, 0,
2335                                     NI_NUMERICHOST);
2336                         r = -1;
2337                         syslog(LOG_ERR,
2338                             "%s from %s exceeded counts/min (limit %d/min)",
2339                             sep->se_service, pname,
2340                             sep->se_maxcpm);
2341                 }
2342         }
2343         return(r);
2344 }
2345
2346 static struct conninfo *
2347 search_conn(struct servtab *sep, int ctrl)
2348 {
2349         struct sockaddr_storage ss;
2350         socklen_t sslen = sizeof(ss);
2351         struct conninfo *conn;
2352         int hv;
2353         char pname[NI_MAXHOST],  pname2[NI_MAXHOST];
2354
2355         if (sep->se_maxperip <= 0)
2356                 return NULL;
2357
2358         /*
2359          * If getpeername() fails, just let it through (if logging is
2360          * enabled the condition is caught elsewhere)
2361          */
2362         if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2363                 return NULL;
2364
2365         switch (ss.ss_family) {
2366         case AF_INET:
2367                 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2368                     sizeof(struct in_addr));
2369                 break;
2370 #ifdef INET6
2371         case AF_INET6:
2372                 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2373                     sizeof(struct in6_addr));
2374                 break;
2375 #endif
2376         default:
2377                 /*
2378                  * Since we only support AF_INET and AF_INET6, just
2379                  * let other than AF_INET and AF_INET6 through.
2380                  */
2381                 return NULL;
2382         }
2383
2384         if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2385             NULL, 0, NI_NUMERICHOST) != 0)
2386                 return NULL;
2387
2388         LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2389                 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2390                     conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2391                     NI_NUMERICHOST) == 0 &&
2392                     strcmp(pname, pname2) == 0)
2393                         break;
2394         }
2395
2396         if (conn == NULL) {
2397                 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2398                         syslog(LOG_ERR, "malloc: %m");
2399                         exit(EX_OSERR);
2400                 }
2401                 conn->co_proc = reallocarray(NULL, sep->se_maxperip,
2402                     sizeof(*conn->co_proc));
2403                 if (conn->co_proc == NULL) {
2404                         syslog(LOG_ERR, "reallocarray: %m");
2405                         exit(EX_OSERR);
2406                 }
2407                 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2408                 conn->co_numchild = 0;
2409                 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2410         }
2411
2412         /*
2413          * Since a child process is not invoked yet, we cannot
2414          * determine a pid of a child.  So, co_proc and co_numchild
2415          * should be filled leter.
2416          */
2417
2418         return conn;
2419 }
2420
2421 static int
2422 room_conn(struct servtab *sep, struct conninfo *conn)
2423 {
2424         char pname[NI_MAXHOST];
2425
2426         if (conn->co_numchild >= sep->se_maxperip) {
2427                 getnameinfo((struct sockaddr *)&conn->co_addr,
2428                     conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2429                     NI_NUMERICHOST);
2430                 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2431                     sep->se_service, pname, sep->se_maxperip);
2432                 return 0;
2433         }
2434         return 1;
2435 }
2436
2437 static void
2438 addchild_conn(struct conninfo *conn, pid_t pid)
2439 {
2440         struct procinfo *proc;
2441
2442         if (conn == NULL)
2443                 return;
2444
2445         if ((proc = search_proc(pid, 1)) != NULL) {
2446                 if (proc->pr_conn != NULL) {
2447                         syslog(LOG_ERR,
2448                             "addchild_conn: child already on process list");
2449                         exit(EX_OSERR);
2450                 }
2451                 proc->pr_conn = conn;
2452         }
2453
2454         conn->co_proc[conn->co_numchild++] = proc;
2455 }
2456
2457 static void
2458 reapchild_conn(pid_t pid)
2459 {
2460         struct procinfo *proc;
2461         struct conninfo *conn;
2462         int i;
2463
2464         if ((proc = search_proc(pid, 0)) == NULL)
2465                 return;
2466         if ((conn = proc->pr_conn) == NULL)
2467                 return;
2468         for (i = 0; i < conn->co_numchild; ++i)
2469                 if (conn->co_proc[i] == proc) {
2470                         conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2471                         break;
2472                 }
2473         free_proc(proc);
2474         free_conn(conn);
2475 }
2476
2477 static void
2478 resize_conn(struct servtab *sep, int maxpip)
2479 {
2480         struct conninfo *conn;
2481         int i, j;
2482
2483         if (sep->se_maxperip <= 0)
2484                 return;
2485         if (maxpip <= 0) {
2486                 free_connlist(sep);
2487                 return;
2488         }
2489         for (i = 0; i < PERIPSIZE; ++i) {
2490                 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2491                         for (j = maxpip; j < conn->co_numchild; ++j)
2492                                 free_proc(conn->co_proc[j]);
2493                         conn->co_proc = reallocarray(conn->co_proc, maxpip,
2494                             sizeof(*conn->co_proc));
2495                         if (conn->co_proc == NULL) {
2496                                 syslog(LOG_ERR, "reallocarray: %m");
2497                                 exit(EX_OSERR);
2498                         }
2499                         if (conn->co_numchild > maxpip)
2500                                 conn->co_numchild = maxpip;
2501                 }
2502         }
2503 }
2504
2505 static void
2506 free_connlist(struct servtab *sep)
2507 {
2508         struct conninfo *conn, *conn_temp;
2509         int i, j;
2510
2511         for (i = 0; i < PERIPSIZE; ++i) {
2512                 LIST_FOREACH_SAFE(conn, &sep->se_conn[i], co_link, conn_temp) {
2513                         if (conn == NULL) {
2514                                 LIST_REMOVE(conn, co_link);
2515                                 continue;
2516                         }
2517                         for (j = 0; j < conn->co_numchild; ++j)
2518                                 free_proc(conn->co_proc[j]);
2519                         conn->co_numchild = 0;
2520                         free_conn(conn);
2521                 }
2522         }
2523 }
2524
2525 static void
2526 free_conn(struct conninfo *conn)
2527 {
2528         if (conn == NULL)
2529                 return;
2530         if (conn->co_numchild <= 0) {
2531                 LIST_REMOVE(conn, co_link);
2532                 free(conn->co_proc);
2533                 free(conn);
2534         }
2535 }
2536
2537 static struct procinfo *
2538 search_proc(pid_t pid, int add)
2539 {
2540         struct procinfo *proc;
2541         int hv;
2542
2543         hv = hashval((char *)&pid, sizeof(pid));
2544         LIST_FOREACH(proc, &proctable[hv], pr_link) {
2545                 if (proc->pr_pid == pid)
2546                         break;
2547         }
2548         if (proc == NULL && add) {
2549                 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2550                         syslog(LOG_ERR, "malloc: %m");
2551                         exit(EX_OSERR);
2552                 }
2553                 proc->pr_pid = pid;
2554                 proc->pr_conn = NULL;
2555                 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2556         }
2557         return proc;
2558 }
2559
2560 static void
2561 free_proc(struct procinfo *proc)
2562 {
2563         if (proc == NULL)
2564                 return;
2565         LIST_REMOVE(proc, pr_link);
2566         free(proc);
2567 }
2568
2569 static int
2570 hashval(char *p, int len)
2571 {
2572         unsigned int hv = 0xABC3D20F;
2573         int i;
2574
2575         for (i = 0; i < len; ++i, ++p)
2576                 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2577         hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2578         return hv;
2579 }