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 nglog(const char *, ...) __printflike(1, 2);
  70 static void nglogx(const char *, ...) __printflike(1, 2);
  71
  72 static int ReceivedSignal;
  73
  74 static int
  75 usage(const char *prog)
  76 {
  77   fprintf(stderr, "usage: %s [-Fd] [-P pidfile] [-a name] [-e exec | -l label]"
  78           " [-p provider] interface\n", prog);
  79   return EX_USAGE;
  80 }
  81
  82 static void
  83 Farewell(int sig)
  84 {
  85   ReceivedSignal = sig;
  86 }
  87
  88 static int
  89 ConfigureNode(const char *prog __unused, const char *iface, const char *provider,
  90               int cs, int ds __unused, int debug, struct ngm_connect *ngc)
  91 {
  92   /*
  93    * We're going to do this with the passed `ds' & `cs' descriptors:
  94    *
  95    * .---------.
  96    * |  ether  |
  97    * | <iface> |
  98    * `---------'
  99    *  (orphan)                                     ds    cs
 100    *     |                                         |     |
 101    *     |                                         |     |
 102    * (ethernet)                                    |     |
 103    * .---------.                                .-----------.
 104    * |  pppoe  |                                |  socket   |
 105    * | <iface> |(pppoe-<pid>)<---->(pppoe-<pid>)| <unnamed> |
 106    * `---------                                 `-----------'
 107    * (exec-<pid>)
 108    *     ^                .-----------.      .-------------.
 109    *     |                |   socket  |      | ppp -direct |
 110    *     `--->(exec-<pid>)| <unnamed> |--fd--|  provider   |
 111    *                      `-----------'      `-------------'
 112    *
 113    * where there are potentially many ppp processes running off of the
 114    * same PPPoE node.
 115    * The exec-<pid> hook isn't made 'till we Spawn().
 116    */
 117
 118   char *epath, *spath;
 119   struct ngpppoe_init_data *data;
 120   const struct hooklist *hlist;
 121   const struct nodeinfo *ninfo;
 122   const struct linkinfo *nlink;
 123   struct ngm_mkpeer mkp;
 124   struct ng_mesg *resp;
 125   u_char rbuf[2048];
 126   uint32_t f;
 127   int plen;
 128
 129   /*
 130    * Ask for a list of hooks attached to the "ether" node.  This node should
 131    * magically exist as a way of hooking stuff onto an ethernet device
 132    */
 133   epath = (char *)alloca(strlen(iface) + 2);
 134   sprintf(epath, "%s:", iface);
 135
 136   if (debug)
 137     fprintf(stderr, "Sending NGM_LISTHOOKS to %s\n", epath);
 138
 139   if (NgSendMsg(cs, epath, NGM_GENERIC_COOKIE, NGM_LISTHOOKS, NULL, 0) < 0) {
 140     if (errno == ENOENT)
 141       fprintf(stderr, "%s Cannot send a netgraph message: Invalid interface\n",
 142               epath);
 143     else
 144       fprintf(stderr, "%s Cannot send a netgraph message: %s\n",
 145               epath, strerror(errno));
 146     return EX_UNAVAILABLE;
 147   }
 148
 149   /* Get our list back */
 150   resp = (struct ng_mesg *)rbuf;
 151   if (NgRecvMsg(cs, resp, sizeof rbuf, NULL) <= 0) {
 152     perror("Cannot get netgraph response");
 153     return EX_UNAVAILABLE;
 154   }
 155
 156   hlist = (const struct hooklist *)resp->data;
 157   ninfo = &hlist->nodeinfo;
 158
 159   if (debug)
 160     fprintf(stderr, "Got reply from id [%x]: Type %s with %d hooks\n",
 161             ninfo->id, ninfo->type, ninfo->hooks);
 162
 163   /* Make sure we've got the right type of node */
 164   if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE, sizeof NG_ETHER_NODE_TYPE - 1)) {
 165     fprintf(stderr, "%s Unexpected node type ``%s'' (wanted ``"
 166             NG_ETHER_NODE_TYPE "'')\n", epath, ninfo->type);
 167     return EX_DATAERR;
 168   }
 169
 170   /* look for a hook already attached.  */
 171   for (f = 0; f < ninfo->hooks; f++) {
 172     nlink = &hlist->link[f];
 173
 174     if (debug)
 175       fprintf(stderr, "  Got [%x]:%s -> [%x]:%s\n", ninfo->id,
 176               nlink->ourhook, nlink->nodeinfo.id, nlink->peerhook);
 177
 178     if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) ||
 179         !strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) {
 180       /*
 181        * Something is using the data coming out of this `ether' node.
 182        * If it's a PPPoE node, we use that node, otherwise we complain that
 183        * someone else is using the node.
 184        */
 185       if (strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE)) {
 186         fprintf(stderr, "%s Node type %s is currently active\n",
 187                 epath, nlink->nodeinfo.type);
 188         return EX_UNAVAILABLE;
 189       }
 190       break;
 191     }
 192   }
 193
 194   if (f == ninfo->hooks) {
 195     /*
 196      * Create a new PPPoE node connected to the `ether' node using
 197      * the magic `orphan' and `ethernet' hooks
 198      */
 199     snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE);
 200     snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN);
 201     snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET);
 202
 203     if (debug)
 204       fprintf(stderr, "Send MKPEER: %s%s -> [type %s]:%s\n", epath,
 205               mkp.ourhook, mkp.type, mkp.peerhook);
 206
 207     if (NgSendMsg(cs, epath, NGM_GENERIC_COOKIE,
 208                   NGM_MKPEER, &mkp, sizeof mkp) < 0) {
 209       fprintf(stderr, "%s Cannot create a peer PPPoE node: %s\n",
 210               epath, strerror(errno));
 211       return EX_OSERR;
 212     }
 213   }
 214
 215   /* Connect the PPPoE node to our socket node.  */
 216   snprintf(ngc->path, sizeof ngc->path, "%s%s", epath, NG_ETHER_HOOK_ORPHAN);
 217   snprintf(ngc->ourhook, sizeof ngc->ourhook, "pppoe-%ld", (long)getpid());
 218   memcpy(ngc->peerhook, ngc->ourhook, sizeof ngc->peerhook);
 219
 220   if (NgSendMsg(cs, ".:", NGM_GENERIC_COOKIE,
 221                 NGM_CONNECT, ngc, sizeof *ngc) < 0) {
 222     perror("Cannot CONNECT PPPoE and socket nodes");
 223     return EX_OSERR;
 224   }
 225
 226   plen = strlen(provider);
 227
 228   data = (struct ngpppoe_init_data *)alloca(sizeof *data + plen);
 229   snprintf(data->hook, sizeof data->hook, "%s", ngc->peerhook);
 230   memcpy(data->data, provider, plen);
 231   data->data_len = plen;
 232
 233   spath = (char *)alloca(strlen(ngc->peerhook) + 3);
 234   strcpy(spath, ".:");
 235   strcpy(spath + 2, ngc->ourhook);
 236
 237   if (debug) {
 238     if (provider)
 239       fprintf(stderr, "Sending PPPOE_LISTEN to %s, provider %s\n",
 240               spath, provider);
 241     else
 242       fprintf(stderr, "Sending PPPOE_LISTEN to %s\n", spath);
 243   }
 244
 245   if (NgSendMsg(cs, spath, NGM_PPPOE_COOKIE, NGM_PPPOE_LISTEN,
 246                 data, sizeof *data + plen) == -1) {
 247     fprintf(stderr, "%s: Cannot LISTEN on netgraph node: %s\n",
 248             spath, strerror(errno));
 249     return EX_OSERR;
 250   }
 251
 252   return 0;
 253 }
 254
 255 static void
 256 Spawn(const char *prog __unused, const char *acname, const char *provider,
 257       const char *exec, struct ngm_connect ngc, int cs, int ds, void *request,
 258       size_t sz, int debug)
 259 {
 260   char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)];
 261   struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
 262   struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep);
 263   struct ngpppoe_init_data *data;
 264   char env[18], unknown[14], sessionid[5], *path;
 265   unsigned char *macaddr;
 266   const char *msg;
 267   int ret, slen;
 268
 269   switch ((ret = fork())) {
 270     case -1:
 271       syslog(LOG_ERR, "fork: %m");
 272       break;
 273
 274     case 0:
 275       switch (fork()) {
 276         case 0:
 277           break;
 278         case -1:
 279           _exit(errno);
 280         default:
 281           _exit(0);
 282       }
 283       close(cs);
 284       close(ds);
 285
 286       /* Create a new socket node */
 287       if (debug)
 288         syslog(LOG_INFO, "Creating a new socket node");
 289
 290       if (NgMkSockNode(NULL, &cs, &ds) == -1) {
 291         syslog(LOG_ERR, "Cannot create netgraph socket node: %m");
 292         _exit(EX_CANTCREAT);
 293       }
 294
 295       /* Connect the PPPoE node to our new socket node.  */
 296       snprintf(ngc.ourhook, sizeof ngc.ourhook, "exec-%ld", (long)getpid());
 297       memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
 298
 299       if (debug)
 300         syslog(LOG_INFO, "Sending CONNECT from .:%s -> %s.%s",
 301                ngc.ourhook, ngc.path, ngc.peerhook);
 302       if (NgSendMsg(cs, ".:", NGM_GENERIC_COOKIE,
 303                     NGM_CONNECT, &ngc, sizeof ngc) < 0) {
 304         syslog(LOG_ERR, "Cannot CONNECT PPPoE and socket nodes: %m");
 305         _exit(EX_OSERR);
 306       }
 307
 308       /*
 309        * If we tell the socket node not to LINGER, it will go away when
 310        * the last hook is removed.
 311        */
 312       if (debug)
 313         syslog(LOG_INFO, "Sending NGM_SOCK_CMD_NOLINGER to socket");
 314       if (NgSendMsg(cs, ".:", NGM_SOCKET_COOKIE,
 315                     NGM_SOCK_CMD_NOLINGER, NULL, 0) < 0) {
 316         syslog(LOG_ERR, "Cannot send NGM_SOCK_CMD_NOLINGER: %m");
 317         _exit(EX_OSERR);
 318       }
 319
 320       /* Put the PPPoE node into OFFER mode */
 321       slen = strlen(acname);
 322       data = (struct ngpppoe_init_data *)alloca(sizeof *data + slen);
 323       snprintf(data->hook, sizeof data->hook, "%s", ngc.ourhook);
 324       memcpy(data->data, acname, slen);
 325       data->data_len = slen;
 326
 327       path = (char *)alloca(strlen(ngc.ourhook) + 3);
 328       strcpy(path, ".:");
 329       strcpy(path + 2, ngc.ourhook);
 330
 331       syslog(LOG_INFO, "Offering to %s as access concentrator %s",
 332              path, acname);
 333       if (NgSendMsg(cs, path, NGM_PPPOE_COOKIE, NGM_PPPOE_OFFER,
 334                     data, sizeof *data + slen) == -1) {
 335         syslog(LOG_INFO, "%s: Cannot OFFER on netgraph node: %m", path);
 336         _exit(EX_OSERR);
 337       }
 338       /* If we have a provider code, set it */
 339       if (provider) {
 340         slen = strlen(provider);
 341         data = (struct ngpppoe_init_data *)alloca(sizeof *data + slen);
 342         snprintf(data->hook, sizeof data->hook, "%s", ngc.ourhook);
 343         memcpy(data->data, provider, slen);
 344         data->data_len = slen;
 345
 346         syslog(LOG_INFO, "adding to %s as offered service %s",
 347              path, acname);
 348         if (NgSendMsg(cs, path, NGM_PPPOE_COOKIE, NGM_PPPOE_SERVICE,
 349                     data, sizeof *data + slen) == -1) {
 350           syslog(LOG_INFO, "%s: Cannot add service on netgraph node: %m", path);
 351           _exit(EX_OSERR);
 352         }
 353       }
 354
 355       /* Put the peer's MAC address in the environment */
 356       if (sz >= sizeof(struct ether_header)) {
 357         macaddr = ((struct ether_header *)request)->ether_shost;
 358         snprintf(env, sizeof(env), "%x:%x:%x:%x:%x:%x",
 359                  macaddr[0], macaddr[1], macaddr[2], macaddr[3], macaddr[4],
 360                  macaddr[5]);
 361         if (setenv(HISMACADDR, env, 1) != 0)
 362           syslog(LOG_INFO, "setenv: cannot set %s: %m", HISMACADDR);
 363       }
 364
 365       /* And send our request data to the waiting node */
 366       if (debug)
 367         syslog(LOG_INFO, "Sending original request to %s (%zu bytes)", path, sz);
 368       if (NgSendData(ds, ngc.ourhook, request, sz) == -1) {
 369         syslog(LOG_ERR, "Cannot send original request to %s: %m", path);
 370         _exit(EX_OSERR);
 371       }
 372
 373       /* Then wait for a success indication */
 374
 375       if (debug)
 376         syslog(LOG_INFO, "Waiting for a SUCCESS reply %s", path);
 377
 378       do {
 379         if ((ret = NgRecvMsg(cs, rep, sizeof msgbuf, NULL)) < 0) {
 380           syslog(LOG_ERR, "%s: Cannot receive a message: %m", path);
 381           _exit(EX_OSERR);
 382         }
 383
 384         if (ret == 0) {
 385           /* The socket has been closed */
 386           syslog(LOG_INFO, "%s: Client timed out", path);
 387           _exit(EX_TEMPFAIL);
 388         }
 389
 390         if (rep->header.version != NG_VERSION) {
 391           syslog(LOG_ERR, "%ld: Unexpected netgraph version, expected %ld",
 392                  (long)rep->header.version, (long)NG_VERSION);
 393           _exit(EX_PROTOCOL);
 394         }
 395
 396         if (rep->header.typecookie != NGM_PPPOE_COOKIE) {
 397           syslog(LOG_INFO, "%ld: Unexpected netgraph cookie, expected %ld",
 398                  (long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE);
 399           continue;
 400         }
 401
 402         switch (rep->header.cmd) {
 403           case NGM_PPPOE_SET_FLAG:      msg = "SET_FLAG";       break;
 404           case NGM_PPPOE_CONNECT:       msg = "CONNECT";        break;
 405           case NGM_PPPOE_LISTEN:        msg = "LISTEN";         break;
 406           case NGM_PPPOE_OFFER:         msg = "OFFER";          break;
 407           case NGM_PPPOE_SUCCESS:       msg = "SUCCESS";        break;
 408           case NGM_PPPOE_FAIL:          msg = "FAIL";           break;
 409           case NGM_PPPOE_CLOSE:         msg = "CLOSE";          break;
 410           case NGM_PPPOE_GET_STATUS:    msg = "GET_STATUS";     break;
 411           case NGM_PPPOE_ACNAME:
 412             msg = "ACNAME";
 413             if (setenv("ACNAME", sts->hook, 1) != 0)
 414               syslog(LOG_WARNING, "setenv: cannot set ACNAME=%s: %m",
 415                      sts->hook);
 416             break;
 417           case NGM_PPPOE_SESSIONID:
 418             msg = "SESSIONID";
 419             snprintf(sessionid, sizeof sessionid, "%04x", *(u_int16_t *)sts);
 420             if (setenv("SESSIONID", sessionid, 1) != 0)
 421               syslog(LOG_WARNING, "setenv: cannot set SESSIONID=%s: %m",
 422                      sessionid);
 423             break;
 424           default:
 425             snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd);
 426             msg = unknown;
 427             break;
 428         }
 429
 430         switch (rep->header.cmd) {
 431           case NGM_PPPOE_FAIL:
 432           case NGM_PPPOE_CLOSE:
 433             syslog(LOG_ERR, "Received NGM_PPPOE_%s (hook \"%s\")",
 434                    msg, sts->hook);
 435             _exit(0);
 436         }
 437
 438         syslog(LOG_INFO, "Received NGM_PPPOE_%s (hook \"%s\")", msg, sts->hook);
 439       } while (rep->header.cmd != NGM_PPPOE_SUCCESS);
 440
 441       dup2(ds, STDIN_FILENO);
 442       dup2(ds, STDOUT_FILENO);
 443       close(ds);
 444       close(cs);
 445
 446       setsid();
 447       syslog(LOG_INFO, "Executing: %s", exec);
 448       execlp(_PATH_BSHELL, _PATH_BSHELL, "-c", exec, NULL);
 449       syslog(LOG_ERR, "execlp failed: %m");
 450       _exit(EX_OSFILE);
 451
 452     default:
 453       wait(&ret);
 454       errno = ret;
 455       if (errno)
 456         syslog(LOG_ERR, "Second fork failed: %m");
 457       break;
 458   }
 459 }
 460
 461 #ifndef NOKLDLOAD
 462 static int
 463 LoadModules(void)
 464 {
 465   const char *module[] = { "netgraph", "ng_socket", "ng_ether", "ng_pppoe" };
 466   size_t f;
 467
 468   for (f = 0; f < sizeof module / sizeof *module; f++)
 469     if (modfind(module[f]) == -1 && kldload(module[f]) == -1) {
 470       fprintf(stderr, "kldload: %s: %s\n", module[f], strerror(errno));
 471       return 0;
 472     }
 473
 474   return 1;
 475 }
 476 #endif
 477
 478 static void
 479 nglog(const char *fmt, ...)
 480 {
 481   char nfmt[256];
 482   va_list ap;
 483
 484   snprintf(nfmt, sizeof nfmt, "%s: %s", fmt, strerror(errno));
 485   va_start(ap, fmt);
 486   vsyslog(LOG_INFO, nfmt, ap);
 487   va_end(ap);
 488 }
 489
 490 static void
 491 nglogx(const char *fmt, ...)
 492 {
 493   va_list ap;
 494
 495   va_start(ap, fmt);
 496   vsyslog(LOG_INFO, fmt, ap);
 497   va_end(ap);
 498 }
 499
 500 int
 501 main(int argc, char *argv[])
 502 {
 503   char hostname[MAXHOSTNAMELEN], *exec, rhook[NG_HOOKSIZ];
 504   unsigned char response[1024];
 505   const char *label, *prog, *provider, *acname;
 506   struct ngm_connect ngc;
 507   struct sigaction act;
 508   int ch, cs, ds, ret, optF, optd, optn, sz, f;
 509   const char *pidfile;
 510
 511   prog = strrchr(argv[0], '/');
 512   prog = prog ? prog + 1 : argv[0];
 513   pidfile = NULL;
 514   exec = NULL;
 515   label = NULL;
 516   acname = NULL;
 517   provider = "";
 518   optF = optd = optn = 0;
 519
 520   while ((ch = getopt(argc, argv, "FP:a:de:l:n:p:")) != -1) {
 521     switch (ch) {
 522       case 'F':
 523         optF = 1;
 524         break;
 525
 526       case 'P':
 527         pidfile = optarg;
 528         break;
 529
 530       case 'a':
 531         acname = optarg;
 532         break;
 533
 534       case 'd':
 535         optd = 1;
 536         break;
 537
 538       case 'e':
 539         exec = optarg;
 540         break;
 541
 542       case 'l':
 543         label = optarg;
 544         break;
 545
 546       case 'n':
 547         optn = 1;
 548         NgSetDebug(atoi(optarg));
 549         break;
 550
 551       case 'p':
 552         provider = optarg;
 553         break;
 554
 555       default:
 556         return usage(prog);
 557     }
 558   }
 559
 560   if (optind >= argc || optind + 2 < argc)
 561     return usage(prog);
 562
 563   if (exec != NULL && label != NULL)
 564     return usage(prog);
 565
 566   if (exec == NULL) {
 567     if (label == NULL)
 568       label = provider;
 569     if (label == NULL) {
 570       fprintf(stderr, "%s: Either a provider, a label or an exec command"
 571               " must be given\n", prog);
 572       return usage(prog);
 573     }
 574     exec = (char *)alloca(sizeof DEFAULT_EXEC_PREFIX + strlen(label));
 575     if (exec == NULL) {
 576       fprintf(stderr, "%s: Cannot allocate %zu bytes\n", prog,
 577               sizeof DEFAULT_EXEC_PREFIX + strlen(label));
 578       return EX_OSERR;
 579     }
 580     strcpy(exec, DEFAULT_EXEC_PREFIX);
 581     strcpy(exec + sizeof DEFAULT_EXEC_PREFIX - 1, label);
 582   }
 583
 584   if (acname == NULL) {
 585     char *dot;
 586
 587     if (gethostname(hostname, sizeof hostname))
 588       strcpy(hostname, "localhost");
 589     else if ((dot = strchr(hostname, '.')))
 590       *dot = '\0';
 591
 592     acname = hostname;
 593   }
 594
 595 #ifndef NOKLDLOAD
 596   if (!LoadModules())
 597     return EX_UNAVAILABLE;
 598 #endif
 599
 600   /* Create a socket node */
 601   if (NgMkSockNode(NULL, &cs, &ds) == -1) {
 602     perror("Cannot create netgraph socket node");
 603     return EX_CANTCREAT;
 604   }
 605
 606   /* Connect it up (and fill in `ngc') */
 607   if ((ret = ConfigureNode(prog, argv[optind], provider, cs, ds,
 608                            optd, &ngc)) != 0) {
 609     close(cs);
 610     close(ds);
 611     return ret;
 612   }
 613
 614   if (!optF && daemon(1, 0) == -1) {
 615     perror("daemon()");
 616     close(cs);
 617     close(ds);
 618     return EX_OSERR;
 619   }
 620
 621
 622   if (pidfile != NULL) {
 623     FILE *fp;
 624
 625     if ((fp = fopen(pidfile, "w")) == NULL) {
 626       perror(pidfile);
 627       close(cs);
 628       close(ds);
 629       return EX_CANTCREAT;
 630     } else {
 631       fprintf(fp, "%d\n", (int)getpid());
 632       fclose(fp);
 633     }
 634   }
 635
 636   openlog(prog, LOG_PID | (optF ? LOG_PERROR : 0), LOG_DAEMON);
 637   if (!optF && optn)
 638     NgSetErrLog(nglog, nglogx);
 639
 640   memset(&act, '\0', sizeof act);
 641   act.sa_handler = Farewell;
 642   act.sa_flags = 0;
 643   sigemptyset(&act.sa_mask);
 644   sigaction(SIGHUP, &act, NULL);
 645   sigaction(SIGINT, &act, NULL);
 646   sigaction(SIGQUIT, &act, NULL);
 647   sigaction(SIGTERM, &act, NULL);
 648
 649   while (!ReceivedSignal) {
 650     if (*provider)
 651       syslog(LOG_INFO, "Listening as provider %s", provider);
 652     else
 653       syslog(LOG_INFO, "Listening");
 654
 655     switch (sz = NgRecvData(ds, response, sizeof response, rhook)) {
 656       case -1:
 657         syslog(LOG_INFO, "NgRecvData: %m");
 658         break;
 659       case 0:
 660         syslog(LOG_INFO, "NgRecvData: socket closed");
 661         break;
 662       default:
 663         if (optd) {
 664           char *dbuf, *ptr;
 665
 666           ptr = dbuf = alloca(sz * 2 + 1);
 667           for (f = 0; f < sz; f++, ptr += 2)
 668             sprintf(ptr, "%02x", (u_char)response[f]);
 669           *ptr = '\0';
 670           syslog(LOG_INFO, "Got %d bytes of data: %s", sz, dbuf);
 671         }
 672     }
 673     if (sz <= 0) {
 674       ret = EX_UNAVAILABLE;
 675       break;
 676     }
 677     Spawn(prog, acname, provider, exec, ngc, cs, ds, response, sz, optd);
 678   }
 679
 680   if (pidfile)
 681     remove(pidfile);
 682
 683   if (ReceivedSignal) {
 684     syslog(LOG_INFO, "Received signal %d, exiting", ReceivedSignal);
 685
 686     signal(ReceivedSignal, SIG_DFL);
 687     raise(ReceivedSignal);
 688
 689     /* NOTREACHED */
 690
 691     ret = -ReceivedSignal;
 692   }
 693
 694   return ret;
 695 }