usr.sbin/ppp/netgraph.c

   1 /*-
   2  * Copyright (c) 2000 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  * $FreeBSD$
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/socket.h>
  31 #include <sys/un.h>
  32 #include <netinet/in.h>
  33 #include <arpa/inet.h>
  34 #include <netdb.h>
  35 #include <netgraph.h>
  36 #include <net/ethernet.h>
  37 #include <netinet/in_systm.h>
  38 #include <netinet/ip.h>
  39 #include <netgraph/ng_ether.h>
  40 #include <netgraph/ng_message.h>
  41 #include <netgraph/ng_socket.h>
  42
  43 #include <errno.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <sysexits.h>
  48 #include <sys/fcntl.h>
  49 #include <sys/uio.h>
  50 #include <termios.h>
  51 #include <sys/time.h>
  52 #include <unistd.h>
  53
  54 #include "layer.h"
  55 #include "defs.h"
  56 #include "mbuf.h"
  57 #include "log.h"
  58 #include "timer.h"
  59 #include "lqr.h"
  60 #include "hdlc.h"
  61 #include "throughput.h"
  62 #include "fsm.h"
  63 #include "lcp.h"
  64 #include "ccp.h"
  65 #include "link.h"
  66 #include "async.h"
  67 #include "descriptor.h"
  68 #include "physical.h"
  69 #include "main.h"
  70 #include "mp.h"
  71 #include "chat.h"
  72 #include "auth.h"
  73 #include "chap.h"
  74 #include "cbcp.h"
  75 #include "datalink.h"
  76 #include "slcompress.h"
  77 #include "iplist.h"
  78 #include "ncpaddr.h"
  79 #include "ipcp.h"
  80 #include "ipv6cp.h"
  81 #include "ncp.h"
  82 #include "filter.h"
  83 #ifndef NORADIUS
  84 #include "radius.h"
  85 #endif
  86 #include "bundle.h"
  87 #include "id.h"
  88 #include "netgraph.h"
  89
  90
  91 struct ngdevice {
  92   struct device dev;                    /* What struct physical knows about */
  93   int cs;                               /* Control socket */
  94   char hook[NG_HOOKSIZ];                /* Our socket node hook */
  95 };
  96
  97 #define device2ng(d)    ((d)->type == NG_DEVICE ? (struct ngdevice *)d : NULL)
  98 #define NG_MSGBUFSZ     4096
  99 #define NETGRAPH_PREFIX "netgraph:"
 100
 101 unsigned
 102 ng_DeviceSize(void)
 103 {
 104   return sizeof(struct ngdevice);
 105 }
 106
 107 static int
 108 ng_MessageOut(struct ngdevice *dev, const char *data)
 109 {
 110   char path[NG_PATHSIZ];
 111   char *fmt;
 112   size_t len;
 113   int pos, dpos;
 114
 115   /*
 116    * We expect a node path, one or more spaces, a command, one or more
 117    * spaces and an ascii netgraph structure.
 118    */
 119   data += strspn(data, " \t");
 120   len = strcspn(data, " \t");
 121   if (len >= sizeof path) {
 122     log_Printf(LogWARN, "%s: %.*s: Node path too long\n",
 123                  dev->dev.name, len, data);
 124     return 0;
 125   }
 126   memcpy(path, data, len);
 127   path[len] = '\0';
 128   data += len;
 129
 130   data += strspn(data, " \t");
 131   len = strcspn(data, " \t");
 132   for (pos = len; pos >= 0; pos--)
 133     if (data[pos] == '%')
 134       len++;
 135   if ((fmt = alloca(len + 4)) == NULL) {
 136     log_Printf(LogWARN, "%s: alloca(%d) failure... %s\n",
 137                dev->dev.name, len + 4, strerror(errno));
 138     return 0;
 139   }
 140
 141   /*
 142    * This is probably a waste of time, but we really don't want to end
 143    * up stuffing unexpected % escapes into the kernel....
 144    */
 145   for (pos = dpos = 0; pos < (int)len;) {
 146     if (data[dpos] == '%')
 147       fmt[pos++] = '%';
 148     fmt[pos++] = data[dpos++];
 149   }
 150   strcpy(fmt + pos, " %s");
 151   data += dpos;
 152
 153   data += strspn(data, " \t");
 154   if (NgSendAsciiMsg(dev->cs, path, fmt, data) < 0) {
 155     log_Printf(LogDEBUG, "%s: NgSendAsciiMsg (to %s): \"%s\", \"%s\": %s\n",
 156                dev->dev.name, path, fmt, data, strerror(errno));
 157     return 0;
 158   }
 159
 160   return 1;
 161 }
 162
 163 /*
 164  * Get a netgraph message
 165  */
 166 static ssize_t
 167 ng_MessageIn(struct physical *p, char *buf, size_t sz)
 168 {
 169   char msgbuf[sizeof(struct ng_mesg) * 2 + NG_MSGBUFSZ];
 170   struct ngdevice *dev = device2ng(p->handler);
 171   struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
 172   char path[NG_PATHSIZ];
 173   size_t len;
 174
 175 #ifdef BROKEN_SELECT
 176   struct timeval t;
 177   fd_set *r;
 178   int ret;
 179
 180   if (dev->cs < 0)
 181     return 0;
 182
 183   if ((r = mkfdset()) == NULL) {
 184     log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
 185     return -1;
 186   }
 187   zerofdset(r);
 188   FD_SET(dev->cs, r);
 189   t.tv_sec = t.tv_usec = 0;
 190   ret = select(dev->cs + 1, r, NULL, NULL, &t);
 191   free(r);
 192
 193   if (ret <= 0)
 194     return 0;
 195 #endif
 196
 197   if (NgRecvAsciiMsg(dev->cs, rep, sizeof msgbuf, path)) {
 198     log_Printf(LogWARN, "%s: NgRecvAsciiMsg: %s\n",
 199                dev->dev.name, strerror(errno));
 200     return -1;
 201   }
 202
 203   /* XXX: Should we check rep->header.version ? */
 204
 205   if (sz == 0)
 206     log_Printf(LogWARN, "%s: Unexpected message: %s\n", dev->dev.name,
 207                rep->header.cmdstr);
 208   else {
 209     log_Printf(LogDEBUG, "%s: Received message: %s\n", dev->dev.name,
 210                rep->header.cmdstr);
 211     len = strlen(rep->header.cmdstr);
 212     if (sz > len)
 213       sz = len;
 214     memcpy(buf, rep->header.cmdstr, sz);
 215   }
 216
 217   return sz;
 218 }
 219
 220 static ssize_t
 221 ng_Write(struct physical *p, const void *v, size_t n)
 222 {
 223   struct ngdevice *dev = device2ng(p->handler);
 224
 225   switch (p->dl->state) {
 226     case DATALINK_DIAL:
 227     case DATALINK_LOGIN:
 228       return ng_MessageOut(dev, v) ? (ssize_t)n : -1;
 229   }
 230   return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : (ssize_t)n;
 231 }
 232
 233 static ssize_t
 234 ng_Read(struct physical *p, void *v, size_t n)
 235 {
 236   char hook[NG_HOOKSIZ];
 237
 238 log_Printf(LogDEBUG, "ng_Read\n");
 239   switch (p->dl->state) {
 240     case DATALINK_DIAL:
 241     case DATALINK_LOGIN:
 242       return ng_MessageIn(p, v, n);
 243   }
 244
 245   return NgRecvData(p->fd, v, n, hook);
 246 }
 247
 248 static int
 249 ng_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
 250 {
 251   struct ngdevice *dev = device2ng(p->handler);
 252   int result;
 253
 254   if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) {
 255     FD_CLR(dev->cs, r);
 256     log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs);
 257     result = 1;
 258   } else
 259     result = 0;
 260
 261   /* Careful... physical_RemoveFromSet() called us ! */
 262
 263   p->handler->removefromset = NULL;
 264   result += physical_RemoveFromSet(p, r, w, e);
 265   p->handler->removefromset = ng_RemoveFromSet;
 266
 267   return result;
 268 }
 269
 270 static void
 271 ng_Free(struct physical *p)
 272 {
 273   struct ngdevice *dev = device2ng(p->handler);
 274
 275   physical_SetDescriptor(p);
 276   if (dev->cs != -1)
 277     close(dev->cs);
 278   free(dev);
 279 }
 280
 281 static void
 282 ng_device2iov(struct device *d, struct iovec *iov, int *niov,
 283               int maxiov __unused, int *auxfd, int *nauxfd)
 284 {
 285   struct ngdevice *dev = device2ng(d);
 286   int sz = physical_MaxDeviceSize();
 287
 288   iov[*niov].iov_base = realloc(d, sz);
 289   if (iov[*niov].iov_base == NULL) {
 290     log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
 291     AbortProgram(EX_OSERR);
 292   }
 293   iov[*niov].iov_len = sz;
 294   (*niov)++;
 295
 296   *auxfd = dev->cs;
 297   (*nauxfd)++;
 298 }
 299
 300 static const struct device basengdevice = {
 301   NG_DEVICE,
 302   "netgraph",
 303   0,
 304   { CD_REQUIRED, DEF_NGCDDELAY },
 305   NULL,
 306   ng_RemoveFromSet,
 307   NULL,
 308   NULL,
 309   NULL,
 310   NULL,
 311   NULL,
 312   ng_Free,
 313   ng_Read,
 314   ng_Write,
 315   ng_device2iov,
 316   NULL,
 317   NULL,
 318   NULL
 319 };
 320
 321 struct device *
 322 ng_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
 323               int maxiov __unused, int *auxfd, int *nauxfd)
 324 {
 325   if (type == NG_DEVICE) {
 326     struct ngdevice *dev = (struct ngdevice *)iov[(*niov)++].iov_base;
 327
 328     dev = realloc(dev, sizeof *dev);    /* Reduce to the correct size */
 329     if (dev == NULL) {
 330       log_Printf(LogALERT, "Failed to allocate memory: %d\n",
 331                  (int)(sizeof *dev));
 332       AbortProgram(EX_OSERR);
 333     }
 334
 335     if (*nauxfd) {
 336       dev->cs = *auxfd;
 337       (*nauxfd)--;
 338     } else
 339       dev->cs = -1;
 340
 341     /* Refresh function pointers etc */
 342     memcpy(&dev->dev, &basengdevice, sizeof dev->dev);
 343
 344     /* XXX: Are netgraph always synchronous ? */
 345     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
 346     return &dev->dev;
 347   }
 348
 349   return NULL;
 350 }
 351
 352 static int
 353 ng_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
 354 {
 355   struct physical *p = descriptor2physical(d);
 356   struct ngdevice *dev = device2ng(p->handler);
 357   int result;
 358
 359   switch (p->dl->state) {
 360     case DATALINK_DIAL:
 361     case DATALINK_LOGIN:
 362       if (r) {
 363         FD_SET(dev->cs, r);
 364         log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs);
 365         result = 1;
 366       } else
 367         result = 0;
 368       break;
 369
 370     default:
 371       result = physical_doUpdateSet(d, r, w, e, n, 0);
 372       break;
 373   }
 374
 375   return result;
 376 }
 377
 378 static int
 379 ng_IsSet(struct fdescriptor *d, const fd_set *fdset)
 380 {
 381   struct physical *p = descriptor2physical(d);
 382   struct ngdevice *dev = device2ng(p->handler);
 383   int result;
 384
 385   result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset);
 386   result += physical_IsSet(d, fdset);
 387
 388   return result;
 389 }
 390
 391 static void
 392 ng_DescriptorRead(struct fdescriptor *d, struct bundle *bundle,
 393                   const fd_set *fdset)
 394 {
 395   struct physical *p = descriptor2physical(d);
 396   struct ngdevice *dev = device2ng(p->handler);
 397
 398   if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset))
 399     ng_MessageIn(p, NULL, 0);
 400
 401   if (physical_IsSet(d, fdset))
 402     physical_DescriptorRead(d, bundle, fdset);
 403 }
 404
 405 static struct device *
 406 ng_Abandon(struct ngdevice *dev, struct physical *p)
 407 {
 408   /* Abandon our node construction */
 409   close(dev->cs);
 410   close(p->fd);
 411   p->fd = -2;   /* Nobody else need try.. */
 412   free(dev);
 413
 414   return NULL;
 415 }
 416
 417
 418 /*
 419  * Populate the ``word'' (of size ``sz'') named ``what'' from ``from''
 420  * ending with any character from ``sep''.  Point ``endp'' at the next
 421  * word.
 422  */
 423
 424 #define GETSEGMENT(what, from, sep, endp) \
 425         getsegment(#what, (what), sizeof(what), from, sep, endp)
 426
 427 static int
 428 getsegment(const char *what, char *word, size_t sz, const char *from,
 429            const char *sep, const char **endp)
 430 {
 431   size_t len;
 432
 433   if ((len = strcspn(from, sep)) == 0) {
 434     log_Printf(LogWARN, "%s name should not be empty !\n", what);
 435     return 0;
 436   }
 437
 438   if (len >= sz) {
 439     log_Printf(LogWARN, "%s name too long, max %d !\n", what, sz - 1);
 440     return 0;
 441   }
 442
 443   strncpy(word, from, len);
 444   word[len] = '\0';
 445
 446   *endp = from + len;
 447   *endp += strspn(*endp, sep);
 448
 449   return 1;
 450 }
 451
 452 struct device *
 453 ng_Create(struct physical *p)
 454 {
 455   struct sockaddr_ng ngsock;
 456   u_char rbuf[2048];
 457   struct sockaddr *sock = (struct sockaddr *)&ngsock;
 458   const struct hooklist *hlist;
 459   const struct nodeinfo *ninfo;
 460   const struct linkinfo *nlink;
 461   struct ngdevice *dev;
 462   struct ng_mesg *resp;
 463   struct ngm_mkpeer mkp;
 464   struct ngm_connect ngc;
 465   const char *devp, *endp;
 466   char lasthook[NG_HOOKSIZ];
 467   char hook[NG_HOOKSIZ];
 468   char nodetype[NG_TYPESIZ + NG_NODESIZ];
 469   char modname[NG_TYPESIZ + 3];
 470   char path[NG_PATHSIZ];
 471   char *nodename;
 472   int len, sz, done;
 473   unsigned f;
 474
 475   dev = NULL;
 476   if (p->fd < 0 && !strncasecmp(p->name.full, NETGRAPH_PREFIX,
 477                                 sizeof NETGRAPH_PREFIX - 1)) {
 478     p->fd--;                            /* We own the device - change fd */
 479
 480     if ((dev = malloc(sizeof *dev)) == NULL)
 481       return NULL;
 482
 483     loadmodules(LOAD_VERBOSLY, "netgraph", "ng_socket", NULL);
 484
 485     /* Create a socket node */
 486     if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) {
 487       log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n",
 488                  strerror(errno));
 489       free(dev);
 490       p->fd = -2;
 491       return NULL;
 492     }
 493
 494     devp = p->name.full + sizeof NETGRAPH_PREFIX - 1;
 495     *lasthook = *path = '\0';
 496     log_Printf(LogDEBUG, "%s: Opening netgraph device \"%s\"\n",
 497                p->link.name, devp);
 498     done = 0;
 499
 500     while (*devp != '\0' && !done) {
 501       if (*devp != '[') {
 502         if (*lasthook == '\0') {
 503           log_Printf(LogWARN, "%s: Netgraph devices must start with"
 504                      " [nodetype:nodename]\n", p->link.name);
 505           return ng_Abandon(dev, p);
 506         }
 507
 508         /* Get the hook name of the new node */
 509         if (!GETSEGMENT(hook, devp, ".[", &endp))
 510           return ng_Abandon(dev, p);
 511         log_Printf(LogDEBUG, "%s: Got hook \"%s\"\n", p->link.name, hook);
 512         devp = endp;
 513         if (*devp == '\0') {
 514           log_Printf(LogWARN, "%s: Netgraph device must not end with a second"
 515                      " hook\n", p->link.name);
 516           return ng_Abandon(dev, p);
 517         }
 518         if (devp[-1] != '[') {
 519           log_Printf(LogWARN, "%s: Expected a [nodetype:nodename] at device"
 520                      " pos %d\n", p->link.name, devp - p->link.name - 1);
 521           return ng_Abandon(dev, p);
 522         }
 523       } else {
 524         /* Use lasthook as the hook name */
 525         strcpy(hook, lasthook);
 526         devp++;
 527       }
 528
 529       /* We've got ``lasthook'' and ``hook'', get the node type */
 530       if (!GETSEGMENT(nodetype, devp, "]", &endp))
 531         return ng_Abandon(dev, p);
 532       log_Printf(LogDEBUG, "%s: Got node \"%s\"\n", p->link.name, nodetype);
 533
 534       if ((nodename = strchr(nodetype, ':')) != NULL) {
 535         *nodename++ = '\0';
 536         if (*nodename == '\0' && *nodetype == '\0') {
 537           log_Printf(LogWARN, "%s: Empty [nodetype:nodename] at device"
 538                      " pos %d\n", p->link.name, devp - p->link.name - 1);
 539           return ng_Abandon(dev, p);
 540         }
 541       }
 542
 543       /* Ignore optional colons after nodes */
 544       devp = *endp == ':' ? endp + 1 : endp;
 545       if (*devp == '.')
 546         devp++;
 547
 548       if (*lasthook == '\0') {
 549         /* This is the first node in the chain */
 550         if (nodename == NULL || *nodename == '\0') {
 551           log_Printf(LogWARN, "%s: %s: No initial device nodename\n",
 552                      p->link.name, devp);
 553           return ng_Abandon(dev, p);
 554         }
 555
 556         if (*nodetype != '\0') {
 557           /* Attempt to load the module */
 558           snprintf(modname, sizeof modname, "ng_%s", nodetype);
 559           log_Printf(LogDEBUG, "%s: Attempting to load %s.ko\n",
 560                      p->link.name, modname);
 561           loadmodules(LOAD_QUIETLY, modname, NULL);
 562         }
 563
 564         snprintf(path, sizeof path, "%s:", nodename);
 565         /* XXX: If we have a node type, ensure it's correct */
 566       } else {
 567         /*
 568          * Ask for a list of hooks attached to the previous node.  If we
 569          * find the one we're interested in, and if it's connected to a
 570          * node of the right type using the correct hook, use that.
 571          * If we find the hook connected to something else, fail.
 572          * If we find no match, mkpeer the new node.
 573          */
 574         if (*nodetype == '\0') {
 575           log_Printf(LogWARN, "%s: Nodetype missing at device offset %d\n",
 576                      p->link.name,
 577                      devp - p->name.full + sizeof NETGRAPH_PREFIX - 1);
 578           return ng_Abandon(dev, p);
 579         }
 580
 581         /* Get a list of node hooks */
 582         if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
 583                       NULL, 0) < 0) {
 584           log_Printf(LogWARN, "%s: %s Cannot send a LISTHOOOKS message: %s\n",
 585                      p->link.name, path, strerror(errno));
 586           return ng_Abandon(dev, p);
 587         }
 588
 589         /* Get our list back */
 590         resp = (struct ng_mesg *)rbuf;
 591         if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) <= 0) {
 592           log_Printf(LogWARN, "%s: Cannot get netgraph response: %s\n",
 593                      p->link.name, strerror(errno));
 594           return ng_Abandon(dev, p);
 595         }
 596
 597         hlist = (const struct hooklist *)resp->data;
 598         ninfo = &hlist->nodeinfo;
 599
 600         log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n",
 601                    path, ninfo->id);
 602
 603         /* look for a hook already attached.  */
 604         for (f = 0; f < ninfo->hooks; f++) {
 605           nlink = &hlist->link[f];
 606
 607           log_Printf(LogDEBUG, "  Found %s -> %s (type %s)\n", nlink->ourhook,
 608                      nlink->peerhook, nlink->nodeinfo.type);
 609
 610           if (!strcmp(nlink->ourhook, lasthook)) {
 611             if (strcmp(nlink->peerhook, hook) ||
 612                 strcmp(nlink->nodeinfo.type, nodetype)) {
 613               log_Printf(LogWARN, "%s: hook %s:%s is already in use\n",
 614                          p->link.name, nlink->ourhook, path);
 615               return ng_Abandon(dev, p);
 616             }
 617             /* The node is already hooked up nicely.... reuse it */
 618             break;
 619           }
 620         }
 621
 622         if (f == ninfo->hooks) {
 623           /* Attempt to load the module */
 624           snprintf(modname, sizeof modname, "ng_%s", nodetype);
 625           log_Printf(LogDEBUG, "%s: Attempting to load %s.ko\n",
 626                      p->link.name, modname);
 627           loadmodules(LOAD_QUIETLY, modname, NULL);
 628
 629           /* Create (mkpeer) the new node */
 630
 631           snprintf(mkp.type, sizeof mkp.type, "%s", nodetype);
 632           snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", lasthook);
 633           snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", hook);
 634
 635           log_Printf(LogDEBUG, "%s: Doing MKPEER %s%s -> %s (type %s)\n",
 636                      p->link.name, path, mkp.ourhook, mkp.peerhook, nodetype);
 637
 638           if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE,
 639                         NGM_MKPEER, &mkp, sizeof mkp) < 0) {
 640             log_Printf(LogWARN, "%s Cannot create %s netgraph node: %s\n",
 641                        path, nodetype, strerror(errno));
 642             return ng_Abandon(dev, p);
 643           }
 644         }
 645         len = strlen(path);
 646         snprintf(path + len, sizeof path - len, "%s%s",
 647                  path[len - 1] == ':' ? "" : ".", lasthook);
 648       }
 649
 650       /* Get a list of node hooks */
 651       if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
 652                     NULL, 0) < 0) {
 653         log_Printf(LogWARN, "%s: %s Cannot send a LISTHOOOKS message: %s\n",
 654                    p->link.name, path, strerror(errno));
 655         return ng_Abandon(dev, p);
 656       }
 657
 658       /* Get our list back */
 659       resp = (struct ng_mesg *)rbuf;
 660       if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) <= 0) {
 661         log_Printf(LogWARN, "%s: Cannot get netgraph response: %s\n",
 662                    p->link.name, strerror(errno));
 663         return ng_Abandon(dev, p);
 664       }
 665
 666       hlist = (const struct hooklist *)resp->data;
 667       ninfo = &hlist->nodeinfo;
 668
 669       if (*lasthook != '\0' && nodename != NULL && *nodename != '\0' &&
 670           strcmp(ninfo->name, nodename) &&
 671           NgNameNode(dev->cs, path, "%s", nodename) < 0) {
 672         log_Printf(LogWARN, "%s: %s: Cannot name netgraph node: %s\n",
 673                    p->link.name, path, strerror(errno));
 674         return ng_Abandon(dev, p);
 675       }
 676
 677       if (!GETSEGMENT(lasthook, devp, " \t.[", &endp))
 678         return ng_Abandon(dev, p);
 679       log_Printf(LogDEBUG, "%s: Got hook \"%s\"\n", p->link.name, lasthook);
 680
 681       len = strlen(lasthook);
 682       done = strchr(" \t", devp[len]) ? 1 : 0;
 683       devp = endp;
 684
 685       if (*devp != '\0') {
 686         if (devp[-1] == '[')
 687           devp--;
 688       } /* else should moan about devp[-1] being '[' ? */
 689     }
 690
 691     snprintf(dev->hook, sizeof dev->hook, "%s", lasthook);
 692
 693     /* Connect the node to our socket node */
 694     snprintf(ngc.path, sizeof ngc.path, "%s", path);
 695     snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook);
 696     memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
 697
 698     log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s.%s\n",
 699                ngc.ourhook, ngc.path, ngc.peerhook);
 700     if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE,
 701                   NGM_CONNECT, &ngc, sizeof ngc) < 0) {
 702       log_Printf(LogWARN, "Cannot connect %s and socket netgraph "
 703                  "nodes: %s\n", path, strerror(errno));
 704       return ng_Abandon(dev, p);
 705     }
 706
 707     /* Hook things up so that we monitor dev->cs */
 708     p->desc.UpdateSet = ng_UpdateSet;
 709     p->desc.IsSet = ng_IsSet;
 710     p->desc.Read = ng_DescriptorRead;
 711
 712     memcpy(&dev->dev, &basengdevice, sizeof dev->dev);
 713
 714   } else {
 715     /* See if we're a netgraph socket */
 716
 717     sz = sizeof ngsock;
 718     if (getsockname(p->fd, sock, &sz) != -1 && sock->sa_family == AF_NETGRAPH) {
 719       /*
 720        * It's a netgraph node... We can't determine hook names etc, so we
 721        * stay pretty impartial....
 722        */
 723       log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name);
 724
 725       if ((dev = malloc(sizeof *dev)) == NULL) {
 726         log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n",
 727                    p->link.name, strerror(errno));
 728         return NULL;
 729       }
 730
 731       memcpy(&dev->dev, &basengdevice, sizeof dev->dev);
 732       dev->cs = -1;
 733       *dev->hook = '\0';
 734     }
 735   }
 736
 737   if (dev) {
 738     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
 739     return &dev->dev;
 740   }
 741
 742   return NULL;
 743 }