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: src/usr.sbin/ppp/netgraph.c,v 1.4.2.1 2002/09/01 02:12:29 brian Exp $
  27  * $DragonFly: src/usr.sbin/ppp/netgraph.c,v 1.3 2007/06/04 00:40:32 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 #ifdef WANT_NETGRAPH7
  41 #include <netgraph7/ng_ether.h>
  42 #include <netgraph7/ng_message.h>
  43 #include <netgraph7/ng_socket.h>
  44 #else
  45 #include <netgraph/ng_ether.h>
  46 #include <netgraph/ng_message.h>
  47 #include <netgraph/ng_socket.h>
  48 #endif
  49
  50 #include <errno.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <sysexits.h>
  55 #include <sys/fcntl.h>
  56 #include <sys/uio.h>
  57 #include <termios.h>
  58 #include <sys/time.h>
  59 #include <unistd.h>
  60
  61 #include "layer.h"
  62 #include "defs.h"
  63 #include "mbuf.h"
  64 #include "log.h"
  65 #include "timer.h"
  66 #include "lqr.h"
  67 #include "hdlc.h"
  68 #include "throughput.h"
  69 #include "fsm.h"
  70 #include "lcp.h"
  71 #include "ccp.h"
  72 #include "link.h"
  73 #include "async.h"
  74 #include "descriptor.h"
  75 #include "physical.h"
  76 #include "main.h"
  77 #include "mp.h"
  78 #include "chat.h"
  79 #include "auth.h"
  80 #include "chap.h"
  81 #include "cbcp.h"
  82 #include "datalink.h"
  83 #include "slcompress.h"
  84 #include "iplist.h"
  85 #include "ncpaddr.h"
  86 #include "ipcp.h"
  87 #include "ipv6cp.h"
  88 #include "ncp.h"
  89 #include "filter.h"
  90 #ifndef NORADIUS
  91 #include "radius.h"
  92 #endif
  93 #include "bundle.h"
  94 #include "id.h"
  95 #include "netgraph.h"
  96
  97
  98 struct ngdevice {
  99   struct device dev;                    /* What struct physical knows about */
 100   int cs;                               /* Control socket */
 101   char hook[NG_HOOKSIZ];                /* Our socket node hook */
 102 };
 103
 104 #define device2ng(d)    ((d)->type == NG_DEVICE ? (struct ngdevice *)d : NULL)
 105 #define NG_MSGBUFSZ     4096
 106 #define NETGRAPH_PREFIX "netgraph:"
 107
 108 unsigned
 109 ng_DeviceSize(void)
 110 {
 111   return sizeof(struct ngdevice);
 112 }
 113
 114 static int
 115 ng_MessageOut(struct ngdevice *dev, const char *data)
 116 {
 117   char path[NG_PATHSIZ];
 118   char *fmt;
 119   size_t len;
 120   int pos, dpos;
 121
 122   /*
 123    * We expect a node path, one or more spaces, a command, one or more
 124    * spaces and an ascii netgraph structure.
 125    */
 126   data += strspn(data, " \t");
 127   len = strcspn(data, " \t");
 128   if (len >= sizeof path) {
 129     log_Printf(LogWARN, "%s: %.*s: Node path too long\n",
 130                  dev->dev.name, len, data);
 131     return 0;
 132   }
 133   memcpy(path, data, len);
 134   path[len] = '\0';
 135   data += len;
 136
 137   data += strspn(data, " \t");
 138   len = strcspn(data, " \t");
 139   for (pos = len; pos >= 0; pos--)
 140     if (data[pos] == '%')
 141       len++;
 142   if ((fmt = alloca(len + 4)) == NULL) {
 143     log_Printf(LogWARN, "%s: alloca(%d) failure... %s\n",
 144                dev->dev.name, len + 4, strerror(errno));
 145     return 0;
 146   }
 147
 148   /*
 149    * This is probably a waste of time, but we really don't want to end
 150    * up stuffing unexpected % escapes into the kernel....
 151    */
 152   for (pos = dpos = 0; pos < (int)len;) {
 153     if (data[dpos] == '%')
 154       fmt[pos++] = '%';
 155     fmt[pos++] = data[dpos++];
 156   }
 157   strcpy(fmt + pos, " %s");
 158   data += dpos;
 159
 160   data += strspn(data, " \t");
 161   if (NgSendAsciiMsg(dev->cs, path, fmt, data) < 0) {
 162     log_Printf(LogDEBUG, "%s: NgSendAsciiMsg (to %s): \"%s\", \"%s\": %s\n",
 163                dev->dev.name, path, fmt, data, strerror(errno));
 164     return 0;
 165   }
 166
 167   return 1;
 168 }
 169
 170 /*
 171  * Get a netgraph message
 172  */
 173 static ssize_t
 174 ng_MessageIn(struct physical *p, char *buf, size_t sz)
 175 {
 176   char msgbuf[sizeof(struct ng_mesg) * 2 + NG_MSGBUFSZ];
 177   struct ngdevice *dev = device2ng(p->handler);
 178   struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
 179   char path[NG_PATHSIZ];
 180   size_t len;
 181
 182 #ifdef BROKEN_SELECT
 183   struct timeval t;
 184   fd_set *r;
 185   int ret;
 186
 187   if (dev->cs < 0)
 188     return 0;
 189
 190   if ((r = mkfdset()) == NULL) {
 191     log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
 192     return -1;
 193   }
 194   zerofdset(r);
 195   FD_SET(dev->cs, r);
 196   t.tv_sec = t.tv_usec = 0;
 197   ret = select(dev->cs + 1, r, NULL, NULL, &t);
 198   free(r);
 199
 200   if (ret <= 0)
 201     return 0;
 202 #endif
 203
 204   if (NgRecvAsciiMsg(dev->cs, rep, sizeof msgbuf, path)) {
 205     log_Printf(LogWARN, "%s: NgRecvAsciiMsg: %s\n",
 206                dev->dev.name, strerror(errno));
 207     return -1;
 208   }
 209
 210   /* XXX: Should we check rep->header.version ? */
 211
 212   if (sz == 0)
 213     log_Printf(LogWARN, "%s: Unexpected message: %s\n", dev->dev.name,
 214                rep->header.cmdstr);
 215   else {
 216     log_Printf(LogDEBUG, "%s: Received message: %s\n", dev->dev.name,
 217                rep->header.cmdstr);
 218     len = strlen(rep->header.cmdstr);
 219     if (sz > len)
 220       sz = len;
 221     memcpy(buf, rep->header.cmdstr, sz);
 222   }
 223
 224   return sz;
 225 }
 226
 227 static ssize_t
 228 ng_Write(struct physical *p, const void *v, size_t n)
 229 {
 230   struct ngdevice *dev = device2ng(p->handler);
 231
 232   switch (p->dl->state) {
 233     case DATALINK_DIAL:
 234     case DATALINK_LOGIN:
 235       return ng_MessageOut(dev, v) ? (ssize_t)n : -1;
 236   }
 237   return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : (ssize_t)n;
 238 }
 239
 240 static ssize_t
 241 ng_Read(struct physical *p, void *v, size_t n)
 242 {
 243   char hook[NG_HOOKSIZ];
 244
 245 log_Printf(LogDEBUG, "ng_Read\n");
 246   switch (p->dl->state) {
 247     case DATALINK_DIAL:
 248     case DATALINK_LOGIN:
 249       return ng_MessageIn(p, v, n);
 250   }
 251
 252   return NgRecvData(p->fd, v, n, hook);
 253 }
 254
 255 static int
 256 ng_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
 257 {
 258   struct ngdevice *dev = device2ng(p->handler);
 259   int result;
 260
 261   if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) {
 262     FD_CLR(dev->cs, r);
 263     log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs);
 264     result = 1;
 265   } else
 266     result = 0;
 267
 268   /* Careful... physical_RemoveFromSet() called us ! */
 269
 270   p->handler->removefromset = NULL;
 271   result += physical_RemoveFromSet(p, r, w, e);
 272   p->handler->removefromset = ng_RemoveFromSet;
 273
 274   return result;
 275 }
 276
 277 static void
 278 ng_Free(struct physical *p)
 279 {
 280   struct ngdevice *dev = device2ng(p->handler);
 281
 282   physical_SetDescriptor(p);
 283   if (dev->cs != -1)
 284     close(dev->cs);
 285   free(dev);
 286 }
 287
 288 static void
 289 ng_device2iov(struct device *d, struct iovec *iov, int *niov,
 290               int maxiov __unused, int *auxfd, int *nauxfd)
 291 {
 292   struct ngdevice *dev = device2ng(d);
 293   int sz = physical_MaxDeviceSize();
 294
 295   iov[*niov].iov_base = realloc(d, sz);
 296   if (iov[*niov].iov_base == NULL) {
 297     log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
 298     AbortProgram(EX_OSERR);
 299   }
 300   iov[*niov].iov_len = sz;
 301   (*niov)++;
 302
 303   *auxfd = dev->cs;
 304   (*nauxfd)++;
 305 }
 306
 307 static const struct device basengdevice = {
 308   NG_DEVICE,
 309   "netgraph",
 310   0,
 311   { CD_REQUIRED, DEF_NGCDDELAY },
 312   NULL,
 313   ng_RemoveFromSet,
 314   NULL,
 315   NULL,
 316   NULL,
 317   NULL,
 318   NULL,
 319   ng_Free,
 320   ng_Read,
 321   ng_Write,
 322   ng_device2iov,
 323   NULL,
 324   NULL,
 325   NULL
 326 };
 327
 328 struct device *
 329 ng_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
 330               int maxiov __unused, int *auxfd, int *nauxfd)
 331 {
 332   if (type == NG_DEVICE) {
 333     struct ngdevice *dev = (struct ngdevice *)iov[(*niov)++].iov_base;
 334
 335     dev = realloc(dev, sizeof *dev);    /* Reduce to the correct size */
 336     if (dev == NULL) {
 337       log_Printf(LogALERT, "Failed to allocate memory: %d\n",
 338                  (int)(sizeof *dev));
 339       AbortProgram(EX_OSERR);
 340     }
 341
 342     if (*nauxfd) {
 343       dev->cs = *auxfd;
 344       (*nauxfd)--;
 345     } else
 346       dev->cs = -1;
 347
 348     /* Refresh function pointers etc */
 349     memcpy(&dev->dev, &basengdevice, sizeof dev->dev);
 350
 351     /* XXX: Are netgraph always synchronous ? */
 352     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
 353     return &dev->dev;
 354   }
 355
 356   return NULL;
 357 }
 358
 359 static int
 360 ng_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
 361 {
 362   struct physical *p = descriptor2physical(d);
 363   struct ngdevice *dev = device2ng(p->handler);
 364   int result;
 365
 366   switch (p->dl->state) {
 367     case DATALINK_DIAL:
 368     case DATALINK_LOGIN:
 369       if (r) {
 370         FD_SET(dev->cs, r);
 371         log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs);
 372         result = 1;
 373       } else
 374         result = 0;
 375       break;
 376
 377     default:
 378       result = physical_doUpdateSet(d, r, w, e, n, 0);
 379       break;
 380   }
 381
 382   return result;
 383 }
 384
 385 static int
 386 ng_IsSet(struct fdescriptor *d, const fd_set *fdset)
 387 {
 388   struct physical *p = descriptor2physical(d);
 389   struct ngdevice *dev = device2ng(p->handler);
 390   int result;
 391
 392   result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset);
 393   result += physical_IsSet(d, fdset);
 394
 395   return result;
 396 }
 397
 398 static void
 399 ng_DescriptorRead(struct fdescriptor *d, struct bundle *bundle,
 400                   const fd_set *fdset)
 401 {
 402   struct physical *p = descriptor2physical(d);
 403   struct ngdevice *dev = device2ng(p->handler);
 404
 405   if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset))
 406     ng_MessageIn(p, NULL, 0);
 407
 408   if (physical_IsSet(d, fdset))
 409     physical_DescriptorRead(d, bundle, fdset);
 410 }
 411
 412 static struct device *
 413 ng_Abandon(struct ngdevice *dev, struct physical *p)
 414 {
 415   /* Abandon our node construction */
 416   close(dev->cs);
 417   close(p->fd);
 418   p->fd = -2;   /* Nobody else need try.. */
 419   free(dev);
 420
 421   return NULL;
 422 }
 423
 424
 425 /*
 426  * Populate the ``word'' (of size ``sz'') named ``what'' from ``from''
 427  * ending with any character from ``sep''.  Point ``endp'' at the next
 428  * word.
 429  */
 430
 431 #define GETSEGMENT(what, from, sep, endp) \
 432         getsegment(#what, (what), sizeof(what), from, sep, endp)
 433
 434 static int
 435 getsegment(const char *what, char *word, size_t sz, const char *from,
 436            const char *sep, const char **endp)
 437 {
 438   size_t len;
 439
 440   if ((len = strcspn(from, sep)) == 0) {
 441     log_Printf(LogWARN, "%s name should not be empty !\n", what);
 442     return 0;
 443   }
 444
 445   if (len >= sz) {
 446     log_Printf(LogWARN, "%s name too long, max %d !\n", what, sz - 1);
 447     return 0;
 448   }
 449
 450   strncpy(word, from, len);
 451   word[len] = '\0';
 452
 453   *endp = from + len;
 454   *endp += strspn(*endp, sep);
 455
 456   return 1;
 457 }
 458
 459 struct device *
 460 ng_Create(struct physical *p)
 461 {
 462   struct sockaddr_ng ngsock;
 463   u_char rbuf[2048];
 464   struct sockaddr *sock = (struct sockaddr *)&ngsock;
 465   const struct hooklist *hlist;
 466   const struct nodeinfo *ninfo;
 467   const struct linkinfo *nlink;
 468   struct ngdevice *dev;
 469   struct ng_mesg *resp;
 470   struct ngm_mkpeer mkp;
 471   struct ngm_connect ngc;
 472   const char *devp, *endp;
 473   char lasthook[NG_HOOKSIZ];
 474   char hook[NG_HOOKSIZ];
 475   char nodetype[NG_TYPESIZ + NG_NODESIZ];
 476   char modname[NG_TYPESIZ + 3];
 477   char path[NG_PATHSIZ];
 478   char *nodename;
 479   int len, sz, done;
 480   unsigned f;
 481
 482   dev = NULL;
 483   if (p->fd < 0 && !strncasecmp(p->name.full, NETGRAPH_PREFIX,
 484                                 sizeof NETGRAPH_PREFIX - 1)) {
 485     p->fd--;                            /* We own the device - change fd */
 486
 487     if ((dev = malloc(sizeof *dev)) == NULL)
 488       return NULL;
 489
 490     loadmodules(LOAD_VERBOSLY, "netgraph", "ng_socket", NULL);
 491
 492     /* Create a socket node */
 493     if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) {
 494       log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n",
 495                  strerror(errno));
 496       free(dev);
 497       p->fd = -2;
 498       return NULL;
 499     }
 500
 501     devp = p->name.full + sizeof NETGRAPH_PREFIX - 1;
 502     *lasthook = *path = '\0';
 503     log_Printf(LogDEBUG, "%s: Opening netgraph device \"%s\"\n",
 504                p->link.name, devp);
 505     done = 0;
 506
 507     while (*devp != '\0' && !done) {
 508       if (*devp != '[') {
 509         if (*lasthook == '\0') {
 510           log_Printf(LogWARN, "%s: Netgraph devices must start with"
 511                      " [nodetype:nodename]\n", p->link.name);
 512           return ng_Abandon(dev, p);
 513         }
 514
 515         /* Get the hook name of the new node */
 516         if (!GETSEGMENT(hook, devp, ".[", &endp))
 517           return ng_Abandon(dev, p);
 518         log_Printf(LogDEBUG, "%s: Got hook \"%s\"\n", p->link.name, hook);
 519         devp = endp;
 520         if (*devp == '\0') {
 521           log_Printf(LogWARN, "%s: Netgraph device must not end with a second"
 522                      " hook\n", p->link.name);
 523           return ng_Abandon(dev, p);
 524         }
 525         if (devp[-1] != '[') {
 526           log_Printf(LogWARN, "%s: Expected a [nodetype:nodename] at device"
 527                      " pos %d\n", p->link.name, devp - p->link.name - 1);
 528           return ng_Abandon(dev, p);
 529         }
 530       } else {
 531         /* Use lasthook as the hook name */
 532         strcpy(hook, lasthook);
 533         devp++;
 534       }
 535
 536       /* We've got ``lasthook'' and ``hook'', get the node type */
 537       if (!GETSEGMENT(nodetype, devp, "]", &endp))
 538         return ng_Abandon(dev, p);
 539       log_Printf(LogDEBUG, "%s: Got node \"%s\"\n", p->link.name, nodetype);
 540
 541       if ((nodename = strchr(nodetype, ':')) != NULL) {
 542         *nodename++ = '\0';
 543         if (*nodename == '\0' && *nodetype == '\0') {
 544           log_Printf(LogWARN, "%s: Empty [nodetype:nodename] at device"
 545                      " pos %d\n", p->link.name, devp - p->link.name - 1);
 546           return ng_Abandon(dev, p);
 547         }
 548       }
 549
 550       /* Ignore optional colons after nodes */
 551       devp = *endp == ':' ? endp + 1 : endp;
 552       if (*devp == '.')
 553         devp++;
 554
 555       if (*lasthook == '\0') {
 556         /* This is the first node in the chain */
 557         if (nodename == NULL || *nodename == '\0') {
 558           log_Printf(LogWARN, "%s: %s: No initial device nodename\n",
 559                      p->link.name, devp);
 560           return ng_Abandon(dev, p);
 561         }
 562
 563         if (*nodetype != '\0') {
 564           /* Attempt to load the module */
 565           snprintf(modname, sizeof modname, "ng_%s", nodetype);
 566           log_Printf(LogDEBUG, "%s: Attempting to load %s.ko\n",
 567                      p->link.name, modname);
 568           loadmodules(LOAD_QUIETLY, modname, NULL);
 569         }
 570
 571         snprintf(path, sizeof path, "%s:", nodename);
 572         /* XXX: If we have a node type, ensure it's correct */
 573       } else {
 574         /*
 575          * Ask for a list of hooks attached to the previous node.  If we
 576          * find the one we're interested in, and if it's connected to a
 577          * node of the right type using the correct hook, use that.
 578          * If we find the hook connected to something else, fail.
 579          * If we find no match, mkpeer the new node.
 580          */
 581         if (*nodetype == '\0') {
 582           log_Printf(LogWARN, "%s: Nodetype missing at device offset %d\n",
 583                      p->link.name,
 584                      devp - p->name.full + sizeof NETGRAPH_PREFIX - 1);
 585           return ng_Abandon(dev, p);
 586         }
 587
 588         /* Get a list of node hooks */
 589         if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
 590                       NULL, 0) < 0) {
 591           log_Printf(LogWARN, "%s: %s Cannot send a LISTHOOOKS message: %s\n",
 592                      p->link.name, path, strerror(errno));
 593           return ng_Abandon(dev, p);
 594         }
 595
 596         /* Get our list back */
 597         resp = (struct ng_mesg *)rbuf;
 598         if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) <= 0) {
 599           log_Printf(LogWARN, "%s: Cannot get netgraph response: %s\n",
 600                      p->link.name, strerror(errno));
 601           return ng_Abandon(dev, p);
 602         }
 603
 604         hlist = (const struct hooklist *)resp->data;
 605         ninfo = &hlist->nodeinfo;
 606
 607         log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n",
 608                    path, ninfo->id);
 609
 610         /* look for a hook already attached.  */
 611         for (f = 0; f < ninfo->hooks; f++) {
 612           nlink = &hlist->link[f];
 613
 614           log_Printf(LogDEBUG, "  Found %s -> %s (type %s)\n", nlink->ourhook,
 615                      nlink->peerhook, nlink->nodeinfo.type);
 616
 617           if (!strcmp(nlink->ourhook, lasthook)) {
 618             if (strcmp(nlink->peerhook, hook) ||
 619                 strcmp(nlink->nodeinfo.type, nodetype)) {
 620               log_Printf(LogWARN, "%s: hook %s:%s is already in use\n",
 621                          p->link.name, nlink->ourhook, path);
 622               return ng_Abandon(dev, p);
 623             }
 624             /* The node is already hooked up nicely.... reuse it */
 625             break;
 626           }
 627         }
 628
 629         if (f == ninfo->hooks) {
 630           /* Attempt to load the module */
 631           snprintf(modname, sizeof modname, "ng_%s", nodetype);
 632           log_Printf(LogDEBUG, "%s: Attempting to load %s.ko\n",
 633                      p->link.name, modname);
 634           loadmodules(LOAD_QUIETLY, modname, NULL);
 635
 636           /* Create (mkpeer) the new node */
 637
 638           snprintf(mkp.type, sizeof mkp.type, "%s", nodetype);
 639           snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", lasthook);
 640           snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", hook);
 641
 642           log_Printf(LogDEBUG, "%s: Doing MKPEER %s%s -> %s (type %s)\n",
 643                      p->link.name, path, mkp.ourhook, mkp.peerhook, nodetype);
 644
 645           if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE,
 646                         NGM_MKPEER, &mkp, sizeof mkp) < 0) {
 647             log_Printf(LogWARN, "%s Cannot create %s netgraph node: %s\n",
 648                        path, nodetype, strerror(errno));
 649             return ng_Abandon(dev, p);
 650           }
 651         }
 652         len = strlen(path);
 653         snprintf(path + len, sizeof path - len, "%s%s",
 654                  path[len - 1] == ':' ? "" : ".", lasthook);
 655       }
 656
 657       /* Get a list of node hooks */
 658       if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
 659                     NULL, 0) < 0) {
 660         log_Printf(LogWARN, "%s: %s Cannot send a LISTHOOOKS message: %s\n",
 661                    p->link.name, path, strerror(errno));
 662         return ng_Abandon(dev, p);
 663       }
 664
 665       /* Get our list back */
 666       resp = (struct ng_mesg *)rbuf;
 667       if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) <= 0) {
 668         log_Printf(LogWARN, "%s: Cannot get netgraph response: %s\n",
 669                    p->link.name, strerror(errno));
 670         return ng_Abandon(dev, p);
 671       }
 672
 673       hlist = (const struct hooklist *)resp->data;
 674       ninfo = &hlist->nodeinfo;
 675
 676       if (*lasthook != '\0' && nodename != NULL && *nodename != '\0' &&
 677           strcmp(ninfo->name, nodename) &&
 678           NgNameNode(dev->cs, path, "%s", nodename) < 0) {
 679         log_Printf(LogWARN, "%s: %s: Cannot name netgraph node: %s\n",
 680                    p->link.name, path, strerror(errno));
 681         return ng_Abandon(dev, p);
 682       }
 683
 684       if (!GETSEGMENT(lasthook, devp, " \t.[", &endp))
 685         return ng_Abandon(dev, p);
 686       log_Printf(LogDEBUG, "%s: Got hook \"%s\"\n", p->link.name, lasthook);
 687
 688       len = strlen(lasthook);
 689       done = strchr(" \t", devp[len]) ? 1 : 0;
 690       devp = endp;
 691
 692       if (*devp != '\0') {
 693         if (devp[-1] == '[')
 694           devp--;
 695       } /* else should moan about devp[-1] being '[' ? */
 696     }
 697
 698     snprintf(dev->hook, sizeof dev->hook, "%s", lasthook);
 699
 700     /* Connect the node to our socket node */
 701     snprintf(ngc.path, sizeof ngc.path, "%s", path);
 702     snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook);
 703     memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
 704
 705     log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s.%s\n",
 706                ngc.ourhook, ngc.path, ngc.peerhook);
 707     if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE,
 708                   NGM_CONNECT, &ngc, sizeof ngc) < 0) {
 709       log_Printf(LogWARN, "Cannot connect %s and socket netgraph "
 710                  "nodes: %s\n", path, strerror(errno));
 711       return ng_Abandon(dev, p);
 712     }
 713
 714     /* Hook things up so that we monitor dev->cs */
 715     p->desc.UpdateSet = ng_UpdateSet;
 716     p->desc.IsSet = ng_IsSet;
 717     p->desc.Read = ng_DescriptorRead;
 718
 719     memcpy(&dev->dev, &basengdevice, sizeof dev->dev);
 720
 721   } else {
 722     /* See if we're a netgraph socket */
 723
 724     sz = sizeof ngsock;
 725     if (getsockname(p->fd, sock, &sz) != -1 && sock->sa_family == AF_NETGRAPH) {
 726       /*
 727        * It's a netgraph node... We can't determine hook names etc, so we
 728        * stay pretty impartial....
 729        */
 730       log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name);
 731
 732       if ((dev = malloc(sizeof *dev)) == NULL) {
 733         log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n",
 734                    p->link.name, strerror(errno));
 735         return NULL;
 736       }
 737
 738       memcpy(&dev->dev, &basengdevice, sizeof dev->dev);
 739       dev->cs = -1;
 740       *dev->hook = '\0';
 741     }
 742   }
 743
 744   if (dev) {
 745     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
 746     return &dev->dev;
 747   }
 748
 749   return NULL;
 750 }