libexec/pppoed/pppoed.c

   1 /*-
   2  * Copyright (c) 1999-2001 Brian Somers <brian@Awfulhak.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/libexec/pppoed/pppoed.c,v 1.2.6.8 2002/06/17 02:21:25 brian Exp $
  27  * $DragonFly: src/libexec/pppoed/pppoed.c,v 1.4 2007/06/04 00:40:31 swildner Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/socket.h>
  32 #include <sys/un.h>
  33 #include <netinet/in.h>
  34 #include <arpa/inet.h>
  35 #include <netdb.h>
  36 #include <netgraph.h>
  37 #include <net/ethernet.h>
  38 #include <netinet/in_systm.h>
  39 #include <netinet/ip.h>
  40 #include <netgraph/ether/ng_ether.h>
  41 #include <netgraph/ng_message.h>
  42 #include <netgraph/pppoe/ng_pppoe.h>
  43 #include <netgraph/socket/ng_socket.h>
  44
  45 #include <errno.h>
  46 #include <paths.h>
  47 #include <signal.h>
  48 #include <stdio.h>
  49 #include <stdarg.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <sysexits.h>
  53 #include <sys/fcntl.h>
  54 #ifndef NOKLDLOAD
  55 #include <sys/linker.h>
  56 #include <sys/module.h>
  57 #endif
  58 #include <sys/uio.h>
  59 #include <sys/wait.h>
  60 #include <syslog.h>
  61 #include <termios.h>
  62 #include <unistd.h>
  63
  64
  65 #define DEFAULT_EXEC_PREFIX     "exec /usr/sbin/ppp -direct "
  66 #define HISMACADDR              "HISMACADDR"
  67 #define SESSION_ID              "SESSION_ID"
  68
  69 static void nglogx(const char *, ...) __printflike(1, 2);
  70
  71 static int ReceivedSignal;
  72
  73 static int
  74 usage(const char *prog)
  75 {
  76   fprintf(stderr, "usage: %s [-Fd] [-P pidfile] [-a name] [-e exec | -l label]"
  77           " [-p provider] interface\n", prog);
  78   return EX_USAGE;
  79 }
  80
  81 static void
  82 Farewell(int sig)
  83 {
  84   ReceivedSignal = sig;
  85 }
  86
  87 static int
  88 ConfigureNode(const char *prog, const char *iface, const char *provider,
  89               int cs, int ds, int debug, struct ngm_connect *ngc)
  90 {
  91   /*
  92    * We're going to do this with the passed `ds' & `cs' descriptors:
  93    *
  94    * .---------.
  95    * |  ether  |
  96    * | <iface> |
  97    * `---------'
  98    *  (orphan)                                     ds    cs
  99    *     |                                         |     |
 100    *     |                                         |     |
 101    * (ethernet)                                    |     |
 102    * .---------.                                .-----------.
 103    * |  pppoe  |                                |  socket   |
 104    * | <iface> |(pppoe-<pid>)<---->(pppoe-<pid>)| <unnamed> |
 105    * `---------                                 `-----------'
 106    * (exec-<pid>)
 107    *     ^                .-----------.      .-------------.
 108    *     |                |   socket  |      | ppp -direct |
 109    *     `--->(exec-<pid>)| <unnamed> |--fd--|  provider   |
 110    *                      `-----------'      `-------------'
 111    *
 112    * where there are potentially many ppp processes running off of the
 113    * same PPPoE node.
 114    * The exec-<pid> hook isn't made 'till we Spawn().
 115    */
 116
 117   char *epath, *spath;
 118   struct ngpppoe_init_data *data;
 119   const struct hooklist *hlist;
 120   const struct nodeinfo *ninfo;
 121   const struct linkinfo *nlink;
 122   struct ngm_mkpeer mkp;
 123   struct ng_mesg *resp;
 124   u_char rbuf[2048];
 125   int f, plen;
 126
 127   /*
 128    * Ask for a list of hooks attached to the "ether" node.  This node should
 129    * magically exist as a way of hooking stuff onto an ethernet device
 130    */
 131   epath = (char *)alloca(strlen(iface) + 2);
 132   sprintf(epath, "%s:", iface);
 133
 134   if (debug)
 135     fprintf(stderr, "Sending NGM_LISTHOOKS to %s\n", epath);
 136
 137   if (NgSendMsg(cs, epath, NGM_GENERIC_COOKIE, NGM_LISTHOOKS, NULL, 0) < 0) {
 138     if (errno == ENOENT)
 139       fprintf(stderr, "%s Cannot send a netgraph message: Invalid interface\n",
 140               epath);
 141     else
 142       fprintf(stderr, "%s Cannot send a netgraph message: %s\n",
 143               epath, strerror(errno));
 144     return EX_UNAVAILABLE;
 145   }
 146
 147   /* Get our list back */
 148   resp = (struct ng_mesg *)rbuf;
 149   if (NgRecvMsg(cs, resp, sizeof rbuf, NULL) <= 0) {
 150     perror("Cannot get netgraph response");
 151     return EX_UNAVAILABLE;
 152   }
 153
 154   hlist = (const struct hooklist *)resp->data;
 155   ninfo = &hlist->nodeinfo;
 156
 157   if (debug)
 158     fprintf(stderr, "Got reply from id [%x]: Type %s with %d hooks\n",
 159             ninfo->id, ninfo->type, ninfo->hooks);
 160
 161   /* Make sure we've got the right type of node */
 162   if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE, sizeof NG_ETHER_NODE_TYPE - 1)) {
 163     fprintf(stderr, "%s Unexpected node type ``%s'' (wanted ``"
 164             NG_ETHER_NODE_TYPE "'')\n", epath, ninfo->type);
 165     return EX_DATAERR;
 166   }
 167
 168   /* look for a hook already attached.  */
 169   for (f = 0; f < ninfo->hooks; f++) {
 170     nlink = &hlist->link[f];
 171
 172     if (debug)
 173       fprintf(stderr, "  Got [%x]:%s -> [%x]:%s\n", ninfo->id,
 174               nlink->ourhook, nlink->nodeinfo.id, nlink->peerhook);
 175
 176     if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) ||
 177         !strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) {
 178       /*
 179        * Something is using the data coming out of this `ether' node.
 180        * If it's a PPPoE node, we use that node, otherwise we complain that
 181        * someone else is using the node.
 182        */
 183       if (strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE)) {
 184         fprintf(stderr, "%s Node type %s is currently active\n",
 185                 epath, nlink->nodeinfo.type);
 186         return EX_UNAVAILABLE;
 187       }
 188       break;
 189     }
 190   }
 191
 192   if (f == ninfo->hooks) {
 193     /*
 194      * Create a new PPPoE node connected to the `ether' node using
 195      * the magic `orphan' and `ethernet' hooks
 196      */
 197     snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE);
 198     snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN);
 199     snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET);
 200
 201     if (debug)
 202       fprintf(stderr, "Send MKPEER: %s%s -> [type %s]:%s\n", epath,
 203               mkp.ourhook, mkp.type, mkp.peerhook);
 204
 205     if (NgSendMsg(cs, epath, NGM_GENERIC_COOKIE,
 206                   NGM_MKPEER, &mkp, sizeof mkp) < 0) {
 207       fprintf(stderr, "%s Cannot create a peer PPPoE node: %s\n",
 208               epath, strerror(errno));
 209       return EX_OSERR;
 210     }
 211   }
 212
 213   /* Connect the PPPoE node to our socket node.  */
 214   snprintf(ngc->path, sizeof ngc->path, "%s%s", epath, NG_ETHER_HOOK_ORPHAN);
 215   snprintf(ngc->ourhook, sizeof ngc->ourhook, "pppoe-%ld", (long)getpid());
 216   memcpy(ngc->peerhook, ngc->ourhook, sizeof ngc->peerhook);
 217
 218   if (NgSendMsg(cs, ".:", NGM_GENERIC_COOKIE,
 219                 NGM_CONNECT, ngc, sizeof *ngc) < 0) {
 220     perror("Cannot CONNECT PPPoE and socket nodes");
 221     return EX_OSERR;
 222   }
 223
 224   plen = strlen(provider);
 225
 226   data = (struct ngpppoe_init_data *)alloca(sizeof *data + plen);
 227   snprintf(data->hook, sizeof data->hook, "%s", ngc->peerhook);
 228   memcpy(data->data, provider, plen);
 229   data->data_len = plen;
 230
 231   spath = (char *)alloca(strlen(ngc->peerhook) + 3);
 232   strcpy(spath, ".:");
 233   strcpy(spath + 2, ngc->ourhook);
 234
 235   if (debug) {
 236     if (provider)
 237       fprintf(stderr, "Sending PPPOE_LISTEN to %s, provider %s\n",
 238               spath, provider);
 239     else
 240       fprintf(stderr, "Sending PPPOE_LISTEN to %s\n", spath);
 241   }
 242
 243   if (NgSendMsg(cs, spath, NGM_PPPOE_COOKIE, NGM_PPPOE_LISTEN,
 244                 data, sizeof *data + plen) == -1) {
 245     fprintf(stderr, "%s: Cannot LISTEN on netgraph node: %s\n",
 246             spath, strerror(errno));
 247     return EX_OSERR;
 248   }
 249
 250   return 0;
 251 }
 252
 253 static void
 254 Spawn(const char *prog, const char *acname, const char *provider,
 255       const char *exec, struct ngm_connect ngc, int cs, int ds, void *request,
 256       int sz, int debug)
 257 {
 258   char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)];
 259   struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
 260   struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep);
 261   struct ngpppoe_init_data *data;
 262   char env[sizeof(HISMACADDR)+18], unknown[14], sessionid[5], *path;
 263   unsigned char *macaddr;
 264   const char *msg;
 265   int ret, slen;
 266
 267   switch ((ret = fork())) {
 268     case -1:
 269       syslog(LOG_ERR, "fork: %m");
 270       break;
 271
 272     case 0:
 273       switch (fork()) {
 274         case 0:
 275           break;
 276         case -1:
 277           _exit(errno);
 278         default:
 279           _exit(0);
 280       }
 281       close(cs);
 282       close(ds);
 283
 284       /* Create a new socket node */
 285       if (debug)
 286         syslog(LOG_INFO, "Creating a new socket node");
 287
 288       if (NgMkSockNode(NULL, &cs, &ds) == -1) {
 289         syslog(LOG_ERR, "Cannot create netgraph socket node: %m");
 290         _exit(EX_CANTCREAT);
 291       }
 292
 293       /* Connect the PPPoE node to our new socket node.  */
 294       snprintf(ngc.ourhook, sizeof ngc.ourhook, "exec-%ld", (long)getpid());
 295       memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
 296
 297       if (debug)
 298         syslog(LOG_INFO, "Sending CONNECT from .:%s -> %s.%s",
 299                ngc.ourhook, ngc.path, ngc.peerhook);
 300       if (NgSendMsg(cs, ".:", NGM_GENERIC_COOKIE,
 301                     NGM_CONNECT, &ngc, sizeof ngc) < 0) {
 302         syslog(LOG_ERR, "Cannot CONNECT PPPoE and socket nodes: %m");
 303         _exit(EX_OSERR);
 304       }
 305
 306       /*
 307        * If we tell the socket node not to LINGER, it will go away when
 308        * the last hook is removed.
 309        */
 310       if (debug)
 311         syslog(LOG_INFO, "Sending NGM_SOCK_CMD_NOLINGER to socket");
 312       if (NgSendMsg(cs, ".:", NGM_SOCKET_COOKIE,
 313                     NGM_SOCK_CMD_NOLINGER, NULL, 0) < 0) {
 314         syslog(LOG_ERR, "Cannot send NGM_SOCK_CMD_NOLINGER: %m");
 315         _exit(EX_OSERR);
 316       }
 317
 318       /* Put the PPPoE node into OFFER mode */
 319       slen = strlen(acname);
 320       data = (struct ngpppoe_init_data *)alloca(sizeof *data + slen);
 321       snprintf(data->hook, sizeof data->hook, "%s", ngc.ourhook);
 322       memcpy(data->data, acname, slen);
 323       data->data_len = slen;
 324
 325       path = (char *)alloca(strlen(ngc.ourhook) + 3);
 326       strcpy(path, ".:");
 327       strcpy(path + 2, ngc.ourhook);
 328
 329       syslog(LOG_INFO, "Offering to %s as access concentrator %s",
 330              path, acname);
 331       if (NgSendMsg(cs, path, NGM_PPPOE_COOKIE, NGM_PPPOE_OFFER,
 332                     data, sizeof *data + slen) == -1) {
 333         syslog(LOG_INFO, "%s: Cannot OFFER on netgraph node: %m", path);
 334         _exit(EX_OSERR);
 335       }
 336       /* If we have a provider code, set it */
 337       if (provider) {
 338         slen = strlen(provider);
 339         data = (struct ngpppoe_init_data *)alloca(sizeof *data + slen);
 340         snprintf(data->hook, sizeof data->hook, "%s", ngc.ourhook);
 341         memcpy(data->data, provider, slen);
 342         data->data_len = slen;
 343
 344         syslog(LOG_INFO, "adding to %s as offered service %s",
 345              path, acname);
 346         if (NgSendMsg(cs, path, NGM_PPPOE_COOKIE, NGM_PPPOE_SERVICE,
 347                     data, sizeof *data + slen) == -1) {
 348           syslog(LOG_INFO, "%s: Cannot add service on netgraph node: %m", path);
 349           _exit(EX_OSERR);
 350         }
 351       }
 352
 353       /* Put the peer's MAC address in the environment */
 354       if (sz >= sizeof(struct ether_header)) {
 355         macaddr = ((struct ether_header *)request)->ether_shost;
 356         snprintf(env, sizeof(env), "%s=%x:%x:%x:%x:%x:%x", HISMACADDR,
 357                  macaddr[0], macaddr[1], macaddr[2], macaddr[3], macaddr[4],
 358                  macaddr[5]);
 359         if (putenv(env) != 0)
 360           syslog(LOG_INFO, "putenv: cannot set %s: %m", env);
 361       }
 362
 363       /* And send our request data to the waiting node */
 364       if (debug)
 365         syslog(LOG_INFO, "Sending original request to %s (%d bytes)", path, sz);
 366       if (NgSendData(ds, ngc.ourhook, request, sz) == -1) {
 367         syslog(LOG_ERR, "Cannot send original request to %s: %m", path);
 368         _exit(EX_OSERR);
 369       }
 370
 371       /* Then wait for a success indication */
 372
 373       if (debug)
 374         syslog(LOG_INFO, "Waiting for a SUCCESS reply %s", path);
 375
 376       do {
 377         if ((ret = NgRecvMsg(cs, rep, sizeof msgbuf, NULL)) < 0) {
 378           syslog(LOG_ERR, "%s: Cannot receive a message: %m", path);
 379           _exit(EX_OSERR);
 380         }
 381
 382         if (ret == 0) {
 383           /* The socket has been closed */
 384           syslog(LOG_INFO, "%s: Client timed out", path);
 385           _exit(EX_TEMPFAIL);
 386         }
 387
 388         if (rep->header.version != NG_VERSION) {
 389           syslog(LOG_ERR, "%ld: Unexpected netgraph version, expected %ld",
 390                  (long)rep->header.version, (long)NG_VERSION);
 391           _exit(EX_PROTOCOL);
 392         }
 393
 394         if (rep->header.typecookie != NGM_PPPOE_COOKIE) {
 395           syslog(LOG_INFO, "%ld: Unexpected netgraph cookie, expected %ld",
 396                  (long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE);
 397           continue;
 398         }
 399
 400         switch (rep->header.cmd) {
 401           case NGM_PPPOE_SET_FLAG:      msg = "SET_FLAG";       break;
 402           case NGM_PPPOE_CONNECT:       msg = "CONNECT";        break;
 403           case NGM_PPPOE_LISTEN:        msg = "LISTEN";         break;
 404           case NGM_PPPOE_OFFER:         msg = "OFFER";          break;
 405           case NGM_PPPOE_SUCCESS:       msg = "SUCCESS";        break;
 406           case NGM_PPPOE_FAIL:          msg = "FAIL";           break;
 407           case NGM_PPPOE_CLOSE:         msg = "CLOSE";          break;
 408           case NGM_PPPOE_GET_STATUS:    msg = "GET_STATUS";     break;
 409           case NGM_PPPOE_ACNAME:
 410             msg = "ACNAME";
 411             if (setenv("ACNAME", sts->hook, 1) != 0)
 412               syslog(LOG_WARNING, "setenv: cannot set ACNAME=%s: %m",
 413                      sts->hook);
 414             break;
 415           case NGM_PPPOE_SESSIONID:
 416             msg = "SESSIONID";
 417             snprintf(sessionid, sizeof sessionid, "%04x", *(u_int16_t *)sts);
 418             if (setenv("SESSIONID", sessionid, 1) != 0)
 419               syslog(LOG_WARNING, "setenv: cannot set SESSIONID=%s: %m",
 420                      sessionid);
 421             break;
 422           default:
 423             snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd);
 424             msg = unknown;
 425             break;
 426         }
 427
 428         switch (rep->header.cmd) {
 429           case NGM_PPPOE_FAIL:
 430           case NGM_PPPOE_CLOSE:
 431             syslog(LOG_ERR, "Received NGM_PPPOE_%s (hook \"%s\")",
 432                    msg, sts->hook);
 433             _exit(0);
 434         }
 435
 436         syslog(LOG_INFO, "Received NGM_PPPOE_%s (hook \"%s\")", msg, sts->hook);
 437       } while (rep->header.cmd != NGM_PPPOE_SUCCESS);
 438
 439       dup2(ds, STDIN_FILENO);
 440       dup2(ds, STDOUT_FILENO);
 441       close(ds);
 442       close(cs);
 443
 444       setsid();
 445       syslog(LOG_INFO, "Executing: %s", exec);
 446       execlp(_PATH_BSHELL, _PATH_BSHELL, "-c", exec, (char *)NULL);
 447       syslog(LOG_ERR, "execlp failed: %m");
 448       _exit(EX_OSFILE);
 449
 450     default:
 451       wait(&ret);
 452       errno = ret;
 453       if (errno)
 454         syslog(LOG_ERR, "Second fork failed: %m");
 455       break;
 456   }
 457 }
 458
 459 #ifndef NOKLDLOAD
 460 static int
 461 LoadModules(void)
 462 {
 463   const char *module[] = { "netgraph", "ng_socket", "ng_ether", "ng_pppoe" };
 464   int f;
 465
 466   for (f = 0; f < sizeof module / sizeof *module; f++)
 467     if (modfind(module[f]) == -1 && kldload(module[f]) == -1) {
 468       fprintf(stderr, "kldload: %s: %s\n", module[f], strerror(errno));
 469       return 0;
 470     }
 471
 472   return 1;
 473 }
 474 #endif
 475
 476 static void
 477 nglog(const char *fmt, ...)
 478 {
 479   char nfmt[256];
 480   va_list ap;
 481
 482   snprintf(nfmt, sizeof nfmt, "%s: %s", fmt, strerror(errno));
 483   va_start(ap, fmt);
 484   vsyslog(LOG_INFO, nfmt, ap);
 485   va_end(ap);
 486 }
 487
 488 static void
 489 nglogx(const char *fmt, ...)
 490 {
 491   va_list ap;
 492
 493   va_start(ap, fmt);
 494   vsyslog(LOG_INFO, fmt, ap);
 495   va_end(ap);
 496 }
 497
 498 int
 499 main(int argc, char *argv[])
 500 {
 501   char hostname[MAXHOSTNAMELEN], *exec, rhook[NG_HOOKSIZ];
 502   unsigned char response[1024];
 503   const char *label, *prog, *provider, *acname;
 504   struct ngm_connect ngc;
 505   struct sigaction act;
 506   int ch, cs, ds, ret, optF, optd, optn, sz, f;
 507   const char *pidfile;
 508
 509   prog = strrchr(argv[0], '/');
 510   prog = prog ? prog + 1 : argv[0];
 511   pidfile = NULL;
 512   exec = NULL;
 513   label = NULL;
 514   acname = NULL;
 515   provider = "";
 516   optF = optd = optn = 0;
 517
 518   while ((ch = getopt(argc, argv, "FP:a:de:l:n:p:")) != -1) {
 519     switch (ch) {
 520       case 'F':
 521         optF = 1;
 522         break;
 523
 524       case 'P':
 525         pidfile = optarg;
 526         break;
 527
 528       case 'a':
 529         acname = optarg;
 530         break;
 531
 532       case 'd':
 533         optd = 1;
 534         break;
 535
 536       case 'e':
 537         exec = optarg;
 538         break;
 539
 540       case 'l':
 541         label = optarg;
 542         break;
 543
 544       case 'n':
 545         optn = 1;
 546         NgSetDebug(atoi(optarg));
 547         break;
 548
 549       case 'p':
 550         provider = optarg;
 551         break;
 552
 553       default:
 554         return usage(prog);
 555     }
 556   }
 557
 558   if (optind >= argc || optind + 2 < argc)
 559     return usage(prog);
 560
 561   if (exec != NULL && label != NULL)
 562     return usage(prog);
 563
 564   if (exec == NULL) {
 565     if (label == NULL)
 566       label = provider;
 567     if (label == NULL) {
 568       fprintf(stderr, "%s: Either a provider, a label or an exec command"
 569               " must be given\n", prog);
 570       return usage(prog);
 571     }
 572     exec = (char *)alloca(sizeof DEFAULT_EXEC_PREFIX + strlen(label));
 573     if (exec == NULL) {
 574       fprintf(stderr, "%s: Cannot allocate %d bytes\n", prog,
 575               (int)(sizeof DEFAULT_EXEC_PREFIX) + strlen(label));
 576       return EX_OSERR;
 577     }
 578     strcpy(exec, DEFAULT_EXEC_PREFIX);
 579     strcpy(exec + sizeof DEFAULT_EXEC_PREFIX - 1, label);
 580   }
 581
 582   if (acname == NULL) {
 583     char *dot;
 584
 585     if (gethostname(hostname, sizeof hostname))
 586       strcpy(hostname, "localhost");
 587     else if ((dot = strchr(hostname, '.')))
 588       *dot = '\0';
 589
 590     acname = hostname;
 591   }
 592
 593 #ifndef NOKLDLOAD
 594   if (!LoadModules())
 595     return EX_UNAVAILABLE;
 596 #endif
 597
 598   /* Create a socket node */
 599   if (NgMkSockNode(NULL, &cs, &ds) == -1) {
 600     perror("Cannot create netgraph socket node");
 601     return EX_CANTCREAT;
 602   }
 603
 604   /* Connect it up (and fill in `ngc') */
 605   if ((ret = ConfigureNode(prog, argv[optind], provider, cs, ds,
 606                            optd, &ngc)) != 0) {
 607     close(cs);
 608     close(ds);
 609     return ret;
 610   }
 611
 612   if (!optF && daemon(1, 0) == -1) {
 613     perror("daemon()");
 614     close(cs);
 615     close(ds);
 616     return EX_OSERR;
 617   }
 618
 619
 620   if (pidfile != NULL) {
 621     FILE *fp;
 622
 623     if ((fp = fopen(pidfile, "w")) == NULL) {
 624       perror(pidfile);
 625       close(cs);
 626       close(ds);
 627       return EX_CANTCREAT;
 628     } else {
 629       fprintf(fp, "%d\n", (int)getpid());
 630       fclose(fp);
 631     }
 632   }
 633
 634   openlog(prog, LOG_PID | (optF ? LOG_PERROR : 0), LOG_DAEMON);
 635   if (!optF && optn)
 636     NgSetErrLog(nglog, nglogx);
 637
 638   memset(&act, '\0', sizeof act);
 639   act.sa_handler = Farewell;
 640   act.sa_flags = 0;
 641   sigemptyset(&act.sa_mask);
 642   sigaction(SIGHUP, &act, NULL);
 643   sigaction(SIGINT, &act, NULL);
 644   sigaction(SIGQUIT, &act, NULL);
 645   sigaction(SIGTERM, &act, NULL);
 646
 647   while (!ReceivedSignal) {
 648     if (*provider)
 649       syslog(LOG_INFO, "Listening as provider %s", provider);
 650     else
 651       syslog(LOG_INFO, "Listening");
 652
 653     switch (sz = NgRecvData(ds, response, sizeof response, rhook)) {
 654       case -1:
 655         syslog(LOG_INFO, "NgRecvData: %m");
 656         break;
 657       case 0:
 658         syslog(LOG_INFO, "NgRecvData: socket closed");
 659         break;
 660       default:
 661         if (optd) {
 662           char *dbuf, *ptr;
 663
 664           ptr = dbuf = alloca(sz * 2 + 1);
 665           for (f = 0; f < sz; f++, ptr += 2)
 666             sprintf(ptr, "%02x", (u_char)response[f]);
 667           *ptr = '\0';
 668           syslog(LOG_INFO, "Got %d bytes of data: %s", sz, dbuf);
 669         }
 670     }
 671     if (sz <= 0) {
 672       ret = EX_UNAVAILABLE;
 673       break;
 674     }
 675     Spawn(prog, acname, provider, exec, ngc, cs, ds, response, sz, optd);
 676   }
 677
 678   if (pidfile)
 679     remove(pidfile);
 680
 681   if (ReceivedSignal) {
 682     syslog(LOG_INFO, "Received signal %d, exiting", ReceivedSignal);
 683
 684     signal(ReceivedSignal, SIG_DFL);
 685     raise(ReceivedSignal);
 686
 687     /* NOTREACHED */
 688
 689     ret = -ReceivedSignal;
 690   }
 691
 692   return ret;
 693 }