usr.sbin/rpc.statd/statd.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-4-Clause
   3  *
   4  * Copyright (c) 1995
   5  *      A.R. Gordon (andrew.gordon@net-tel.co.uk).  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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed for the FreeBSD project
  18  * 4. Neither the name of the author nor the names of any co-contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  */
  35
  36 /* main() function for status monitor daemon.  Some of the code in this */
  37 /* file was generated by running rpcgen /usr/include/rpcsvc/sm_inter.x  */
  38 /* The actual program logic is in the file procs.c                      */
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 #include <err.h>
  44 #include <errno.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <rpc/rpc.h>
  48 #include <rpc/rpc_com.h>
  49 #include <string.h>
  50 #include <syslog.h>
  51 #include <sys/types.h>
  52 #include <sys/socket.h>
  53 #include <sys/wait.h>
  54 #include <netinet/in.h>
  55 #include <arpa/inet.h>
  56 #include <netdb.h>
  57 #include <signal.h>
  58 #include <unistd.h>
  59 #include "statd.h"
  60
  61 #define GETPORT_MAXTRY  20      /* Max tries to get a port # */
  62
  63 int debug = 0;          /* Controls syslog() calls for debug messages   */
  64
  65 static char **hosts, *svcport_str = NULL;
  66 static int nhosts = 0;
  67 static int xcreated = 0;
  68 static int      mallocd_svcport = 0;
  69 static int      *sock_fd;
  70 static int      sock_fdcnt;
  71 static int      sock_fdpos;
  72
  73 static int      create_service(struct netconfig *nconf);
  74 static void     complete_service(struct netconfig *nconf, char *port_str);
  75 static void     clearout_service(void);
  76 static void handle_sigchld(int sig);
  77 void out_of_mem(void) __dead2;
  78
  79 static void usage(void) __dead2;
  80
  81 int
  82 main(int argc, char **argv)
  83 {
  84   struct sigaction sa;
  85   struct netconfig *nconf;
  86   void *nc_handle;
  87   in_port_t svcport;
  88   int ch, i, s;
  89   char *endptr;
  90   char **hosts_bak;
  91   int have_v6 = 1;
  92   int maxrec = RPC_MAXDATASIZE;
  93   int attempt_cnt, port_len, port_pos, ret;
  94   char **port_list;
  95
  96   while ((ch = getopt(argc, argv, "dh:p:")) != -1)
  97     switch (ch) {
  98     case 'd':
  99       debug = 1;
 100       break;
 101     case 'h':
 102       ++nhosts;
 103       hosts_bak = hosts;
 104       hosts_bak = realloc(hosts, nhosts * sizeof(char *));
 105       if (hosts_bak == NULL) {
 106               if (hosts != NULL) {
 107                       for (i = 0; i < nhosts; i++)
 108                               free(hosts[i]);
 109                       free(hosts);
 110                       out_of_mem();
 111               }
 112       }
 113       hosts = hosts_bak;
 114       hosts[nhosts - 1] = strdup(optarg);
 115       if (hosts[nhosts - 1] == NULL) {
 116               for (i = 0; i < (nhosts - 1); i++)
 117                       free(hosts[i]);
 118               free(hosts);
 119               out_of_mem();
 120       }
 121       break;
 122     case 'p':
 123       endptr = NULL;
 124       svcport = (in_port_t)strtoul(optarg, &endptr, 10);
 125       if (endptr == NULL || *endptr != '\0' || svcport == 0 ||
 126           svcport >= IPPORT_MAX)
 127         usage();
 128
 129       svcport_str = strdup(optarg);
 130       break;
 131     default:
 132       usage();
 133     }
 134   argc -= optind;
 135   argv += optind;
 136
 137   (void)rpcb_unset(SM_PROG, SM_VERS, NULL);
 138
 139   /*
 140    * Check if IPv6 support is present.
 141    */
 142   s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 143   if (s < 0)
 144       have_v6 = 0;
 145   else
 146       close(s);
 147
 148   rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 149
 150   /*
 151    * If no hosts were specified, add a wildcard entry to bind to
 152    * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
 153    * list.
 154    */
 155   if (nhosts == 0) {
 156           hosts = malloc(sizeof(char *));
 157           if (hosts == NULL)
 158                   out_of_mem();
 159
 160           hosts[0] = strdup("*");
 161           nhosts = 1;
 162   } else {
 163           hosts_bak = hosts;
 164           if (have_v6) {
 165                   hosts_bak = realloc(hosts, (nhosts + 2) *
 166                       sizeof(char *));
 167                   if (hosts_bak == NULL) {
 168                           for (i = 0; i < nhosts; i++)
 169                                   free(hosts[i]);
 170                           free(hosts);
 171                           out_of_mem();
 172                   } else
 173                           hosts = hosts_bak;
 174
 175                   nhosts += 2;
 176                   hosts[nhosts - 2] = strdup("::1");
 177           } else {
 178                   hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
 179                   if (hosts_bak == NULL) {
 180                           for (i = 0; i < nhosts; i++)
 181                                   free(hosts[i]);
 182
 183                           free(hosts);
 184                           out_of_mem();
 185                   } else {
 186                           nhosts += 1;
 187                           hosts = hosts_bak;
 188                   }
 189           }
 190           hosts[nhosts - 1] = strdup("127.0.0.1");
 191   }
 192
 193   attempt_cnt = 1;
 194   sock_fdcnt = 0;
 195   sock_fd = NULL;
 196   port_list = NULL;
 197   port_len = 0;
 198   nc_handle = setnetconfig();
 199   while ((nconf = getnetconfig(nc_handle))) {
 200           /* We want to listen only on udp6, tcp6, udp, tcp transports */
 201           if (nconf->nc_flag & NC_VISIBLE) {
 202                   /* Skip if there's no IPv6 support */
 203                   if (have_v6 == 0 && strcmp(nconf->nc_protofmly, "inet6") == 0) {
 204               /* DO NOTHING */
 205                   } else {
 206                         ret = create_service(nconf);
 207                         if (ret == 1)
 208                                 /* Ignore this call */
 209                                 continue;
 210                         if (ret < 0) {
 211                                 /*
 212                                  * Failed to bind port, so close off
 213                                  * all sockets created and try again
 214                                  * if the port# was dynamically
 215                                  * assigned via bind(2).
 216                                  */
 217                                 clearout_service();
 218                                 if (mallocd_svcport != 0 &&
 219                                     attempt_cnt < GETPORT_MAXTRY) {
 220                                         free(svcport_str);
 221                                         svcport_str = NULL;
 222                                         mallocd_svcport = 0;
 223                                 } else {
 224                                         errno = EADDRINUSE;
 225                                         syslog(LOG_ERR,
 226                                             "bindresvport_sa: %m");
 227                                         exit(1);
 228                                 }
 229
 230                                 /* Start over at the first service. */
 231                                 free(sock_fd);
 232                                 sock_fdcnt = 0;
 233                                 sock_fd = NULL;
 234                                 nc_handle = setnetconfig();
 235                                 attempt_cnt++;
 236                         } else if (mallocd_svcport != 0 &&
 237                             attempt_cnt == GETPORT_MAXTRY) {
 238                                 /*
 239                                  * For the last attempt, allow
 240                                  * different port #s for each nconf
 241                                  * by saving the svcport_str and
 242                                  * setting it back to NULL.
 243                                  */
 244                                 port_list = realloc(port_list,
 245                                     (port_len + 1) * sizeof(char *));
 246                                 if (port_list == NULL)
 247                                         out_of_mem();
 248                                 port_list[port_len++] = svcport_str;
 249                                 svcport_str = NULL;
 250                                 mallocd_svcport = 0;
 251                         }
 252                   }
 253           }
 254   }
 255
 256   /*
 257    * Successfully bound the ports, so call complete_service() to
 258    * do the rest of the setup on the service(s).
 259    */
 260   sock_fdpos = 0;
 261   port_pos = 0;
 262   nc_handle = setnetconfig();
 263   while ((nconf = getnetconfig(nc_handle))) {
 264           /* We want to listen only on udp6, tcp6, udp, tcp transports */
 265           if (nconf->nc_flag & NC_VISIBLE) {
 266                   /* Skip if there's no IPv6 support */
 267                   if (have_v6 == 0 && strcmp(nconf->nc_protofmly, "inet6") == 0) {
 268               /* DO NOTHING */
 269                   } else if (port_list != NULL) {
 270                         if (port_pos >= port_len) {
 271                                 syslog(LOG_ERR, "too many port#s");
 272                                 exit(1);
 273                         }
 274                         complete_service(nconf, port_list[port_pos++]);
 275                   } else
 276                         complete_service(nconf, svcport_str);
 277           }
 278   }
 279   endnetconfig(nc_handle);
 280   free(sock_fd);
 281   if (port_list != NULL) {
 282         for (port_pos = 0; port_pos < port_len; port_pos++)
 283                 free(port_list[port_pos]);
 284         free(port_list);
 285   }
 286
 287   init_file("/var/db/statd.status");
 288
 289   /* Note that it is NOT sensible to run this program from inetd - the  */
 290   /* protocol assumes that it will run immediately at boot time.        */
 291   daemon(0, 0);
 292   openlog("rpc.statd", 0, LOG_DAEMON);
 293   if (debug) syslog(LOG_INFO, "Starting - debug enabled");
 294   else syslog(LOG_INFO, "Starting");
 295
 296   /* Install signal handler to collect exit status of child processes   */
 297   sa.sa_handler = handle_sigchld;
 298   sigemptyset(&sa.sa_mask);
 299   sigaddset(&sa.sa_mask, SIGCHLD);
 300   sa.sa_flags = SA_RESTART;
 301   sigaction(SIGCHLD, &sa, NULL);
 302
 303   /* Initialisation now complete - start operating                      */
 304   notify_hosts();       /* Forks a process (if necessary) to do the     */
 305                         /* SM_NOTIFY calls, which may be slow.          */
 306
 307   svc_run();    /* Should never return                                  */
 308   exit(1);
 309 }
 310
 311 /*
 312  * This routine creates and binds sockets on the appropriate
 313  * addresses. It gets called one time for each transport.
 314  * It returns 0 upon success, 1 for ingore the call and -1 to indicate
 315  * bind failed with EADDRINUSE.
 316  * Any file descriptors that have been created are stored in sock_fd and
 317  * the total count of them is maintained in sock_fdcnt.
 318  */
 319 static int
 320 create_service(struct netconfig *nconf)
 321 {
 322         struct addrinfo hints, *res = NULL;
 323         struct sockaddr_in *sin;
 324         struct sockaddr_in6 *sin6;
 325         struct __rpc_sockinfo si;
 326         int aicode;
 327         int fd;
 328         int nhostsbak;
 329         int r;
 330         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 331         int mallocd_res;
 332
 333         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 334             (nconf->nc_semantics != NC_TPI_COTS) &&
 335             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 336                 return (1);     /* not my type */
 337
 338         /*
 339          * XXX - using RPC library internal functions.
 340          */
 341         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 342                 syslog(LOG_ERR, "cannot get information for %s",
 343                     nconf->nc_netid);
 344                 return (1);
 345         }
 346
 347         /* Get rpc.statd's address on this transport */
 348         memset(&hints, 0, sizeof hints);
 349         hints.ai_family = si.si_af;
 350         hints.ai_socktype = si.si_socktype;
 351         hints.ai_protocol = si.si_proto;
 352
 353         /*
 354          * Bind to specific IPs if asked to
 355          */
 356         nhostsbak = nhosts;
 357         while (nhostsbak > 0) {
 358                 --nhostsbak;
 359                 sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
 360                 if (sock_fd == NULL)
 361                         out_of_mem();
 362                 sock_fd[sock_fdcnt++] = -1;     /* Set invalid for now. */
 363                 mallocd_res = 0;
 364                 hints.ai_flags = AI_PASSIVE;
 365
 366                 /*
 367                  * XXX - using RPC library internal functions.
 368                  */
 369                 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
 370                         syslog(LOG_ERR, "cannot create socket for %s",
 371                             nconf->nc_netid);
 372                         continue;
 373                 }
 374                 switch (hints.ai_family) {
 375                 case AF_INET:
 376                         if (inet_pton(AF_INET, hosts[nhostsbak],
 377                             host_addr) == 1) {
 378                                 hints.ai_flags |= AI_NUMERICHOST;
 379                         } else {
 380                                 /*
 381                                  * Skip if we have an AF_INET6 address.
 382                                  */
 383                                 if (inet_pton(AF_INET6, hosts[nhostsbak],
 384                                     host_addr) == 1) {
 385                                         close(fd);
 386                                         continue;
 387                                 }
 388                         }
 389                         break;
 390                 case AF_INET6:
 391                         if (inet_pton(AF_INET6, hosts[nhostsbak],
 392                             host_addr) == 1) {
 393                                 hints.ai_flags |= AI_NUMERICHOST;
 394                         } else {
 395                                 /*
 396                                  * Skip if we have an AF_INET address.
 397                                  */
 398                                 if (inet_pton(AF_INET, hosts[nhostsbak],
 399                                     host_addr) == 1) {
 400                                         close(fd);
 401                                         continue;
 402                                 }
 403                         }
 404                         break;
 405                 default:
 406                         break;
 407                 }
 408
 409                 /*
 410                  * If no hosts were specified, just bind to INADDR_ANY
 411                  */
 412                 if (strcmp("*", hosts[nhostsbak]) == 0) {
 413                         if (svcport_str == NULL) {
 414                                 res = malloc(sizeof(struct addrinfo));
 415                                 if (res == NULL)
 416                                         out_of_mem();
 417                                 mallocd_res = 1;
 418                                 res->ai_flags = hints.ai_flags;
 419                                 res->ai_family = hints.ai_family;
 420                                 res->ai_protocol = hints.ai_protocol;
 421                                 switch (res->ai_family) {
 422                                 case AF_INET:
 423                                         sin = malloc(sizeof(struct sockaddr_in));
 424                                         if (sin == NULL)
 425                                                 out_of_mem();
 426                                         sin->sin_family = AF_INET;
 427                                         sin->sin_port = htons(0);
 428                                         sin->sin_addr.s_addr = htonl(INADDR_ANY);
 429                                         res->ai_addr = (struct sockaddr*) sin;
 430                                         res->ai_addrlen = (socklen_t)
 431                                             sizeof(struct sockaddr_in);
 432                                         break;
 433                                 case AF_INET6:
 434                                         sin6 = malloc(sizeof(struct sockaddr_in6));
 435                                         if (sin6 == NULL)
 436                                                 out_of_mem();
 437                                         sin6->sin6_family = AF_INET6;
 438                                         sin6->sin6_port = htons(0);
 439                                         sin6->sin6_addr = in6addr_any;
 440                                         res->ai_addr = (struct sockaddr*) sin6;
 441                                         res->ai_addrlen = (socklen_t)
 442                                             sizeof(struct sockaddr_in6);
 443                                         break;
 444                                 default:
 445                                         syslog(LOG_ERR, "bad addr fam %d",
 446                                             res->ai_family);
 447                                         exit(1);
 448                                 }
 449                         } else {
 450                                 if ((aicode = getaddrinfo(NULL, svcport_str,
 451                                     &hints, &res)) != 0) {
 452                                         syslog(LOG_ERR,
 453                                             "cannot get local address for %s: %s",
 454                                             nconf->nc_netid,
 455                                             gai_strerror(aicode));
 456                                         close(fd);
 457                                         continue;
 458                                 }
 459                         }
 460                 } else {
 461                         if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
 462                             &hints, &res)) != 0) {
 463                                 syslog(LOG_ERR,
 464                                     "cannot get local address for %s: %s",
 465                                     nconf->nc_netid, gai_strerror(aicode));
 466                                 close(fd);
 467                                 continue;
 468                         }
 469                 }
 470
 471                 /* Store the fd. */
 472                 sock_fd[sock_fdcnt - 1] = fd;
 473
 474                 /* Now, attempt the bind. */
 475                 r = bindresvport_sa(fd, res->ai_addr);
 476                 if (r != 0) {
 477                         if (errno == EADDRINUSE && mallocd_svcport != 0) {
 478                                 if (mallocd_res != 0) {
 479                                         free(res->ai_addr);
 480                                         free(res);
 481                                 } else
 482                                         freeaddrinfo(res);
 483                                 return (-1);
 484                         }
 485                         syslog(LOG_ERR, "bindresvport_sa: %m");
 486                         exit(1);
 487                 }
 488
 489                 if (svcport_str == NULL) {
 490                         svcport_str = malloc(NI_MAXSERV * sizeof(char));
 491                         if (svcport_str == NULL)
 492                                 out_of_mem();
 493                         mallocd_svcport = 1;
 494
 495                         if (getnameinfo(res->ai_addr,
 496                             res->ai_addr->sa_len, NULL, NI_MAXHOST,
 497                             svcport_str, NI_MAXSERV * sizeof(char),
 498                             NI_NUMERICHOST | NI_NUMERICSERV))
 499                                 errx(1, "Cannot get port number");
 500                 }
 501                 if (mallocd_res != 0) {
 502                         free(res->ai_addr);
 503                         free(res);
 504                 } else
 505                         freeaddrinfo(res);
 506                 res = NULL;
 507         }
 508         return (0);
 509 }
 510
 511 /*
 512  * Called after all the create_service() calls have succeeded, to complete
 513  * the setup and registration.
 514  */
 515 static void
 516 complete_service(struct netconfig *nconf, char *port_str)
 517 {
 518         struct addrinfo hints, *res = NULL;
 519         struct __rpc_sockinfo si;
 520         struct netbuf servaddr;
 521         SVCXPRT *transp = NULL;
 522         int aicode, fd, nhostsbak;
 523         int registered = 0;
 524
 525         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 526             (nconf->nc_semantics != NC_TPI_COTS) &&
 527             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 528                 return; /* not my type */
 529
 530         /*
 531          * XXX - using RPC library internal functions.
 532          */
 533         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 534                 syslog(LOG_ERR, "cannot get information for %s",
 535                     nconf->nc_netid);
 536                 return;
 537         }
 538
 539         nhostsbak = nhosts;
 540         while (nhostsbak > 0) {
 541                 --nhostsbak;
 542                 if (sock_fdpos >= sock_fdcnt) {
 543                         /* Should never happen. */
 544                         syslog(LOG_ERR, "Ran out of socket fd's");
 545                         return;
 546                 }
 547                 fd = sock_fd[sock_fdpos++];
 548                 if (fd < 0)
 549                         continue;
 550
 551                 if (nconf->nc_semantics != NC_TPI_CLTS)
 552                         listen(fd, SOMAXCONN);
 553
 554                 transp = svc_tli_create(fd, nconf, NULL,
 555                 RPC_MAXDATASIZE, RPC_MAXDATASIZE);
 556
 557                 if (transp != (SVCXPRT *) NULL) {
 558                         if (!svc_register(transp, SM_PROG, SM_VERS,
 559                             sm_prog_1, 0)) {
 560                                 syslog(LOG_ERR, "can't register on %s",
 561                                     nconf->nc_netid);
 562                         } else {
 563                                 if (!svc_reg(transp, SM_PROG, SM_VERS,
 564                                     sm_prog_1, NULL))
 565                                         syslog(LOG_ERR,
 566                                             "can't register %s SM_PROG service",
 567                                             nconf->nc_netid);
 568                         }
 569                 } else
 570                         syslog(LOG_WARNING, "can't create %s services",
 571                             nconf->nc_netid);
 572
 573                 if (registered == 0) {
 574                         registered = 1;
 575                         memset(&hints, 0, sizeof hints);
 576                         hints.ai_flags = AI_PASSIVE;
 577                         hints.ai_family = si.si_af;
 578                         hints.ai_socktype = si.si_socktype;
 579                         hints.ai_protocol = si.si_proto;
 580
 581
 582                         if ((aicode = getaddrinfo(NULL, port_str, &hints,
 583                             &res)) != 0) {
 584                                 syslog(LOG_ERR, "cannot get local address: %s",
 585                                     gai_strerror(aicode));
 586                                 exit(1);
 587                         }
 588
 589                         servaddr.buf = malloc(res->ai_addrlen);
 590                         memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
 591                         servaddr.len = res->ai_addrlen;
 592
 593                         rpcb_set(SM_PROG, SM_VERS, nconf, &servaddr);
 594
 595                         xcreated++;
 596                         freeaddrinfo(res);
 597                 }
 598         } /* end while */
 599 }
 600
 601 /*
 602  * Clear out sockets after a failure to bind one of them, so that the
 603  * cycle of socket creation/binding can start anew.
 604  */
 605 static void
 606 clearout_service(void)
 607 {
 608         int i;
 609
 610         for (i = 0; i < sock_fdcnt; i++) {
 611                 if (sock_fd[i] >= 0) {
 612                         shutdown(sock_fd[i], SHUT_RDWR);
 613                         close(sock_fd[i]);
 614                 }
 615         }
 616 }
 617
 618 static void
 619 usage(void)
 620 {
 621       fprintf(stderr, "usage: rpc.statd [-d] [-h <bindip>] [-p <port>]\n");
 622       exit(1);
 623 }
 624
 625 /* handle_sigchld ---------------------------------------------------------- */
 626 /*
 627    Purpose:     Catch SIGCHLD and collect process status
 628    Retruns:     Nothing.
 629    Notes:       No special action required, other than to collect the
 630                 process status and hence allow the child to die:
 631                 we only use child processes for asynchronous transmission
 632                 of SM_NOTIFY to other systems, so it is normal for the
 633                 children to exit when they have done their work.
 634 */
 635
 636 static void handle_sigchld(int sig __unused)
 637 {
 638   int pid, status;
 639   pid = wait4(-1, &status, WNOHANG, (struct rusage*)0);
 640   if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??");
 641   else if (status == 0)
 642   {
 643     if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid);
 644   }
 645   else syslog(LOG_ERR, "Child %d failed with status %d", pid,
 646     WEXITSTATUS(status));
 647 }
 648
 649 /*
 650  * Out of memory, fatal
 651  */
 652 void
 653 out_of_mem(void)
 654 {
 655
 656         syslog(LOG_ERR, "out of memory");
 657         exit(2);
 658 }