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