netgraph.c revision 267654 
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: releng/9.3/usr.sbin/ppp/netgraph.c 196513 2009-08-24 17:18:17Z brian $
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
91struct 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
101unsigned
102ng_DeviceSize(void)
103{
104  return sizeof(struct ngdevice);
105}
106
107static int
108ng_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 */
166static ssize_t
167ng_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
220static ssize_t
221ng_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
233static ssize_t
234ng_Read(struct physical *p, void *v, size_t n)
235{
236  char hook[NG_HOOKSIZ];
237
238  switch (p->dl->state) {
239    case DATALINK_DIAL:
240    case DATALINK_LOGIN:
241      return ng_MessageIn(p, v, n);
242  }
243
244  return NgRecvData(p->fd, v, n, hook);
245}
246
247static int
248ng_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
249{
250  struct ngdevice *dev = device2ng(p->handler);
251  int result;
252
253  if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) {
254    FD_CLR(dev->cs, r);
255    log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs);
256    result = 1;
257  } else
258    result = 0;
259
260  /* Careful... physical_RemoveFromSet() called us ! */
261
262  p->handler->removefromset = NULL;
263  result += physical_RemoveFromSet(p, r, w, e);
264  p->handler->removefromset = ng_RemoveFromSet;
265
266  return result;
267}
268
269static void
270ng_Free(struct physical *p)
271{
272  struct ngdevice *dev = device2ng(p->handler);
273
274  physical_SetDescriptor(p);
275  if (dev->cs != -1)
276    close(dev->cs);
277  free(dev);
278}
279
280static void
281ng_device2iov(struct device *d, struct iovec *iov, int *niov,
282              int maxiov __unused, int *auxfd, int *nauxfd)
283{
284  struct ngdevice *dev;
285  int sz = physical_MaxDeviceSize();
286
287  iov[*niov].iov_base = d = realloc(d, sz);
288  if (d == NULL) {
289    log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
290    AbortProgram(EX_OSERR);
291  }
292  iov[*niov].iov_len = sz;
293  (*niov)++;
294
295  dev = device2ng(d);
296  *auxfd = dev->cs;
297  (*nauxfd)++;
298}
299
300static 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
321struct device *
322ng_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
352static int
353ng_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
378static int
379ng_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
391static void
392ng_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
405static struct device *
406ng_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
427static int
428getsegment(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
452struct device *
453ng_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}
744