mp.c revision 37320 
1/*-
2 * Copyright (c) 1998 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 *	$Id: mp.c,v 1.11 1998/06/24 19:33:34 brian Exp $
27 */
28
29#include <sys/types.h>
30#include <netinet/in.h>
31#include <netinet/in_systm.h>
32#include <netinet/ip.h>
33#include <arpa/inet.h>
34#include <net/if_dl.h>
35#include <sys/socket.h>
36#include <sys/un.h>
37
38#include <errno.h>
39#include <paths.h>
40#include <stdlib.h>
41#include <stdio.h>
42#include <string.h>
43#include <sys/stat.h>
44#include <termios.h>
45#include <unistd.h>
46
47#include "defs.h"
48#include "command.h"
49#include "mbuf.h"
50#include "log.h"
51#include "timer.h"
52#include "fsm.h"
53#include "iplist.h"
54#include "throughput.h"
55#include "slcompress.h"
56#include "ipcp.h"
57#include "auth.h"
58#include "lcp.h"
59#include "lqr.h"
60#include "hdlc.h"
61#include "async.h"
62#include "ccp.h"
63#include "link.h"
64#include "descriptor.h"
65#include "physical.h"
66#include "chat.h"
67#include "lcpproto.h"
68#include "filter.h"
69#include "mp.h"
70#include "chap.h"
71#include "datalink.h"
72#include "bundle.h"
73#include "ip.h"
74#include "prompt.h"
75#include "id.h"
76#include "arp.h"
77
78void
79peerid_Init(struct peerid *peer)
80{
81  peer->enddisc.class = 0;
82  *peer->enddisc.address = '\0';
83  peer->enddisc.len = 0;
84  *peer->authname = '\0';
85}
86
87int
88peerid_Equal(const struct peerid *p1, const struct peerid *p2)
89{
90  return !strcmp(p1->authname, p2->authname) &&
91         p1->enddisc.class == p2->enddisc.class &&
92         p1->enddisc.len == p2->enddisc.len &&
93         !memcmp(p1->enddisc.address, p2->enddisc.address, p1->enddisc.len);
94}
95
96static u_int32_t
97inc_seq(unsigned is12bit, u_int32_t seq)
98{
99  seq++;
100  if (is12bit) {
101    if (seq & 0xfffff000)
102      seq = 0;
103  } else if (seq & 0xff000000)
104    seq = 0;
105  return seq;
106}
107
108static int
109isbefore(unsigned is12bit, u_int32_t seq1, u_int32_t seq2)
110{
111  u_int32_t max = (is12bit ? 0xfff : 0xffffff) - 0x200;
112
113  if (seq1 > max) {
114    if (seq2 < 0x200 || seq2 > seq1)
115      return 1;
116  } else if ((seq1 > 0x200 || seq2 <= max) && seq1 < seq2)
117    return 1;
118
119  return 0;
120}
121
122static int
123mp_ReadHeader(struct mp *mp, struct mbuf *m, struct mp_header *header)
124{
125  if (mp->local_is12bit) {
126    header->seq = ntohs(*(u_int16_t *)MBUF_CTOP(m));
127    if (header->seq & 0x3000) {
128      log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
129      return 0;
130    }
131    header->begin = header->seq & 0x8000 ? 1 : 0;
132    header->end = header->seq & 0x4000 ? 1 : 0;
133    header->seq &= 0x0fff;
134    return 2;
135  } else {
136    header->seq = ntohl(*(u_int32_t *)MBUF_CTOP(m));
137    if (header->seq & 0x3f000000) {
138      log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
139      return 0;
140    }
141    header->begin = header->seq & 0x80000000 ? 1 : 0;
142    header->end = header->seq & 0x40000000 ? 1 : 0;
143    header->seq &= 0x00ffffff;
144    return 4;
145  }
146}
147
148static void
149mp_LayerStart(void *v, struct fsm *fp)
150{
151  /* The given FSM (ccp) is about to start up ! */
152}
153
154static void
155mp_LayerUp(void *v, struct fsm *fp)
156{
157  /* The given fsm (ccp) is now up */
158}
159
160static void
161mp_LayerDown(void *v, struct fsm *fp)
162{
163  /* The given FSM (ccp) has been told to come down */
164}
165
166static void
167mp_LayerFinish(void *v, struct fsm *fp)
168{
169  /* The given fsm (ccp) is now down */
170  if (fp->state == ST_CLOSED && fp->open_mode == OPEN_PASSIVE)
171    fsm_Open(fp);		/* CCP goes to ST_STOPPED */
172}
173
174void
175mp_Init(struct mp *mp, struct bundle *bundle)
176{
177  mp->peer_is12bit = mp->local_is12bit = 0;
178  mp->peer_mrru = mp->local_mrru = 0;
179
180  peerid_Init(&mp->peer);
181
182  mp->out.seq = 0;
183  mp->out.link = 0;
184  mp->seq.min_in = 0;
185  mp->seq.next_in = 0;
186  mp->inbufs = NULL;
187  mp->bundle = bundle;
188
189  mp->link.type = MP_LINK;
190  mp->link.name = "mp";
191  mp->link.len = sizeof *mp;
192
193  throughput_init(&mp->link.throughput);
194  memset(mp->link.Queue, '\0', sizeof mp->link.Queue);
195  memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in);
196  memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out);
197
198  mp->fsmp.LayerStart = mp_LayerStart;
199  mp->fsmp.LayerUp = mp_LayerUp;
200  mp->fsmp.LayerDown = mp_LayerDown;
201  mp->fsmp.LayerFinish = mp_LayerFinish;
202  mp->fsmp.object = mp;
203
204  mpserver_Init(&mp->server);
205
206  mp->cfg.mrru = 0;
207  mp->cfg.shortseq = NEG_ENABLED|NEG_ACCEPTED;
208  mp->cfg.enddisc.class = 0;
209  *mp->cfg.enddisc.address = '\0';
210  mp->cfg.enddisc.len = 0;
211
212  lcp_Init(&mp->link.lcp, mp->bundle, &mp->link, NULL);
213  ccp_Init(&mp->link.ccp, mp->bundle, &mp->link, &mp->fsmp);
214}
215
216int
217mp_Up(struct mp *mp, struct datalink *dl)
218{
219  struct lcp *lcp = &dl->physical->link.lcp;
220
221  if (mp->active) {
222    /* We're adding a link - do a last validation on our parameters */
223    if (!peerid_Equal(&dl->peer, &mp->peer)) {
224      log_Printf(LogPHASE, "%s: Inappropriate peer !\n", dl->name);
225      return MP_FAILED;
226    }
227    if (mp->local_mrru != lcp->want_mrru ||
228        mp->peer_mrru != lcp->his_mrru ||
229        mp->local_is12bit != lcp->want_shortseq ||
230        mp->peer_is12bit != lcp->his_shortseq) {
231      log_Printf(LogPHASE, "%s: Invalid MRRU/SHORTSEQ MP parameters !\n",
232                dl->name);
233      return MP_FAILED;
234    }
235    return MP_ADDED;
236  } else {
237    /* First link in multilink mode */
238
239    mp->local_mrru = lcp->want_mrru;
240    mp->peer_mrru = lcp->his_mrru;
241    mp->local_is12bit = lcp->want_shortseq;
242    mp->peer_is12bit = lcp->his_shortseq;
243    mp->peer = dl->peer;
244
245    throughput_init(&mp->link.throughput);
246    memset(mp->link.Queue, '\0', sizeof mp->link.Queue);
247    memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in);
248    memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out);
249
250    mp->out.seq = 0;
251    mp->out.link = 0;
252    mp->seq.min_in = 0;
253    mp->seq.next_in = 0;
254
255    /*
256     * Now we create our server socket.
257     * If it already exists, join it.  Otherwise, create and own it
258     */
259    switch (mpserver_Open(&mp->server, &mp->peer)) {
260    case MPSERVER_CONNECTED:
261      log_Printf(LogPHASE, "mp: Transfer link on %s\n",
262                mp->server.socket.sun_path);
263      mp->server.send.dl = dl;		/* Defer 'till it's safe to send */
264      return MP_LINKSENT;
265    case MPSERVER_FAILED:
266      return MP_FAILED;
267    case MPSERVER_LISTENING:
268      log_Printf(LogPHASE, "mp: Listening on %s\n", mp->server.socket.sun_path);
269      log_Printf(LogPHASE, "    First link: %s\n", dl->name);
270
271      /* Re-point our IPCP layer at our MP link */
272      ipcp_SetLink(&mp->bundle->ncp.ipcp, &mp->link);
273
274      /* Our lcp's already up 'cos of the NULL parent */
275      if (ccp_SetOpenMode(&mp->link.ccp)) {
276        fsm_Up(&mp->link.ccp.fsm);
277        fsm_Open(&mp->link.ccp.fsm);
278      }
279
280      mp->active = 1;
281      break;
282    }
283  }
284
285  return MP_UP;
286}
287
288void
289mp_Down(struct mp *mp)
290{
291  if (mp->active) {
292    struct mbuf *next;
293
294    /* Don't want any more of these */
295    mpserver_Close(&mp->server);
296
297    /* CCP goes down with a bang */
298    fsm2initial(&mp->link.ccp.fsm);
299
300    /* Received fragments go in the bit-bucket */
301    while (mp->inbufs) {
302      next = mp->inbufs->pnext;
303      mbuf_Free(mp->inbufs);
304      mp->inbufs = next;
305    }
306
307    peerid_Init(&mp->peer);
308    mp->active = 0;
309  }
310}
311
312void
313mp_linkInit(struct mp_link *mplink)
314{
315  mplink->seq = 0;
316  mplink->weight = 1500;
317}
318
319void
320mp_Input(struct mp *mp, struct mbuf *m, struct physical *p)
321{
322  struct mp_header mh, h;
323  struct mbuf *q, *last;
324  int32_t seq;
325
326  /*
327   * When `m' and `p' are NULL, it means our oldest link has gone down.
328   * We want to determine a new min, and process any intermediate stuff
329   * as normal
330   */
331
332  if (m && mp_ReadHeader(mp, m, &mh) == 0) {
333    mbuf_Free(m);
334    return;
335  }
336
337  if (p) {
338    seq = p->dl->mp.seq;
339    p->dl->mp.seq = mh.seq;
340  } else
341    seq = mp->seq.min_in;
342
343  if (mp->seq.min_in == seq) {
344    /*
345     * We've received new data on the link that has our min (oldest) seq.
346     * Figure out which link now has the smallest (oldest) seq.
347     */
348    struct datalink *dl;
349
350    mp->seq.min_in = (u_int32_t)-1;
351    for (dl = mp->bundle->links; dl; dl = dl->next)
352      if (dl->state == DATALINK_OPEN &&
353          (mp->seq.min_in == -1 ||
354           isbefore(mp->local_is12bit, dl->mp.seq, mp->seq.min_in)))
355        mp->seq.min_in = dl->mp.seq;
356  }
357
358  /*
359   * Now process as many of our fragments as we can, adding our new
360   * fragment in as we go, and ordering with the oldest at the top of
361   * the queue.
362   */
363
364  if (!mp->inbufs) {
365    mp->inbufs = m;
366    m = NULL;
367  }
368
369  last = NULL;
370  seq = mp->seq.next_in;
371  q = mp->inbufs;
372  while (q) {
373    mp_ReadHeader(mp, q, &h);
374    if (m && isbefore(mp->local_is12bit, mh.seq, h.seq)) {
375      /* Our received fragment fits in before this one, so link it in */
376      if (last)
377        last->pnext = m;
378      else
379        mp->inbufs = m;
380      m->pnext = q;
381      q = m;
382      h = mh;
383      m = NULL;
384    }
385
386    if (h.seq != seq) {
387      /* we're missing something :-( */
388      if (mp->seq.min_in > seq) {
389        /* we're never gonna get it */
390        struct mbuf *next;
391
392        /* Zap all older fragments */
393        while (mp->inbufs != q) {
394          log_Printf(LogDEBUG, "Drop frag\n");
395          next = mp->inbufs->pnext;
396          mbuf_Free(mp->inbufs);
397          mp->inbufs = next;
398        }
399
400        /*
401         * Zap everything until the next `end' fragment OR just before
402         * the next `begin' fragment OR 'till seq.min_in - whichever
403         * comes first.
404         */
405        do {
406          mp_ReadHeader(mp, mp->inbufs, &h);
407          if (h.begin) {
408            /* We might be able to process this ! */
409            h.seq--;  /* We're gonna look for fragment with h.seq+1 */
410            break;
411          }
412          next = mp->inbufs->pnext;
413          log_Printf(LogDEBUG, "Drop frag %u\n", h.seq);
414          mbuf_Free(mp->inbufs);
415          mp->inbufs = next;
416        } while (mp->inbufs && (h.seq >= mp->seq.min_in || h.end));
417
418        /*
419         * Continue processing things from here.
420         * This deals with the possibility that we received a fragment
421         * on the slowest link that invalidates some of our data (because
422         * of the hole at `q'), but where there are subsequent `whole'
423         * packets that have already been received.
424         */
425
426        mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq);
427        last = NULL;
428        q = mp->inbufs;
429      } else
430        /* we may still receive the missing fragment */
431        break;
432    } else if (h.end) {
433      /* We've got something, reassemble */
434      struct mbuf **frag = &q;
435      int len;
436      u_long first = -1;
437
438      do {
439        *frag = mp->inbufs;
440        mp->inbufs = mp->inbufs->pnext;
441        len = mp_ReadHeader(mp, *frag, &h);
442        if (first == -1)
443          first = h.seq;
444        (*frag)->offset += len;
445        (*frag)->cnt -= len;
446        (*frag)->pnext = NULL;
447        if (frag == &q && !h.begin) {
448          log_Printf(LogWARN, "Oops - MP frag %lu should have a begin flag\n",
449                    (u_long)h.seq);
450          mbuf_Free(q);
451          q = NULL;
452        } else if (frag != &q && h.begin) {
453          log_Printf(LogWARN, "Oops - MP frag %lu should have an end flag\n",
454                    (u_long)h.seq - 1);
455          /*
456           * Stuff our fragment back at the front of the queue and zap
457           * our half-assembed packet.
458           */
459          (*frag)->pnext = mp->inbufs;
460          mp->inbufs = *frag;
461          *frag = NULL;
462          mbuf_Free(q);
463          q = NULL;
464          frag = &q;
465          h.end = 0;	/* just in case it's a whole packet */
466        } else
467          do
468            frag = &(*frag)->next;
469          while (*frag != NULL);
470      } while (!h.end);
471
472      if (q) {
473        u_short proto;
474        u_char ch;
475
476        q = mbuf_Read(q, &ch, 1);
477        proto = ch;
478        if (!(proto & 1)) {
479          q = mbuf_Read(q, &ch, 1);
480          proto <<= 8;
481          proto += ch;
482        }
483        if (log_IsKept(LogDEBUG))
484          log_Printf(LogDEBUG, "MP: Reassembled frags %ld-%lu, length %d\n",
485                    first, (u_long)h.seq, mbuf_Length(q));
486        hdlc_DecodePacket(mp->bundle, proto, q, &mp->link);
487      }
488
489      mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq);
490      last = NULL;
491      q = mp->inbufs;
492    } else {
493      /* Look for the next fragment */
494      seq = inc_seq(mp->local_is12bit, seq);
495      last = q;
496      q = q->pnext;
497    }
498  }
499
500  if (m) {
501    /* We still have to find a home for our new fragment */
502    last = NULL;
503    for (q = mp->inbufs; q; last = q, q = q->pnext) {
504      mp_ReadHeader(mp, q, &h);
505      if (isbefore(mp->local_is12bit, mh.seq, h.seq))
506        break;
507    }
508    /* Our received fragment fits in here */
509    if (last)
510      last->pnext = m;
511    else
512      mp->inbufs = m;
513    m->pnext = q;
514  }
515}
516
517static void
518mp_Output(struct mp *mp, struct link *l, struct mbuf *m, u_int32_t begin,
519          u_int32_t end)
520{
521  struct mbuf *mo;
522
523  /* Stuff an MP header on the front of our packet and send it */
524  mo = mbuf_Alloc(4, MB_MP);
525  mo->next = m;
526  if (mp->peer_is12bit) {
527    u_int16_t *seq16;
528
529    seq16 = (u_int16_t *)MBUF_CTOP(mo);
530    *seq16 = htons((begin << 15) | (end << 14) | (u_int16_t)mp->out.seq);
531    mo->cnt = 2;
532  } else {
533    u_int32_t *seq32;
534
535    seq32 = (u_int32_t *)MBUF_CTOP(mo);
536    *seq32 = htonl((begin << 31) | (end << 30) | (u_int32_t)mp->out.seq);
537    mo->cnt = 4;
538  }
539  if (log_IsKept(LogDEBUG))
540    log_Printf(LogDEBUG, "MP[frag %d]: Send %d bytes on link `%s'\n",
541              mp->out.seq, mbuf_Length(mo), l->name);
542  mp->out.seq = inc_seq(mp->peer_is12bit, mp->out.seq);
543
544  if (!ccp_Compress(&l->ccp, l, PRI_NORMAL, PROTO_MP, mo))
545    hdlc_Output(l, PRI_NORMAL, PROTO_MP, mo);
546}
547
548int
549mp_FillQueues(struct bundle *bundle)
550{
551  struct mp *mp = &bundle->ncp.mp;
552  struct datalink *dl, *fdl;
553  int total, add, len, thislink, nlinks;
554  u_int32_t begin, end;
555  struct mbuf *m, *mo;
556
557  thislink = nlinks = 0;
558  for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) {
559    /* Include non-open links here as mp->out.link will stay more correct */
560    if (!fdl) {
561      if (thislink == mp->out.link)
562        fdl = dl;
563      else
564        thislink++;
565    }
566    nlinks++;
567  }
568
569  if (!fdl) {
570    fdl = bundle->links;
571    if (!fdl)
572      return 0;
573    thislink = 0;
574  }
575
576  total = 0;
577  for (dl = fdl; nlinks > 0; dl = dl->next, nlinks--, thislink++) {
578    if (!dl) {
579      dl = bundle->links;
580      thislink = 0;
581    }
582
583    if (dl->state != DATALINK_OPEN)
584      continue;
585
586    if (dl->physical->out)
587      /* this link has suffered a short write.  Let it continue */
588      continue;
589
590    add = link_QueueLen(&dl->physical->link);
591    total += add;
592    if (add)
593      /* this link has got stuff already queued.  Let it continue */
594      continue;
595
596    if (!link_QueueLen(&mp->link) && !ip_FlushPacket(&mp->link, bundle))
597      /* Nothing else to send */
598      break;
599
600    m = link_Dequeue(&mp->link);
601    len = mbuf_Length(m);
602    begin = 1;
603    end = 0;
604
605    while (!end) {
606      if (dl->state == DATALINK_OPEN) {
607        if (len <= dl->mp.weight + LINK_MINWEIGHT) {
608          /*
609           * XXX: Should we remember how much of our `weight' wasn't sent
610           *      so that we can compensate next time ?
611           */
612          mo = m;
613          end = 1;
614        } else {
615          mo = mbuf_Alloc(dl->mp.weight, MB_MP);
616          mo->cnt = dl->mp.weight;
617          len -= mo->cnt;
618          m = mbuf_Read(m, MBUF_CTOP(mo), mo->cnt);
619        }
620        mp_Output(mp, &dl->physical->link, mo, begin, end);
621        begin = 0;
622      }
623
624      if (!end) {
625        nlinks--;
626        dl = dl->next;
627        if (!dl) {
628          dl = bundle->links;
629          thislink = 0;
630        } else
631          thislink++;
632      }
633    }
634  }
635  mp->out.link = thislink;		/* Start here next time */
636
637  return total;
638}
639
640int
641mp_SetDatalinkWeight(struct cmdargs const *arg)
642{
643  int val;
644
645  if (arg->argc != arg->argn+1)
646    return -1;
647
648  val = atoi(arg->argv[arg->argn]);
649  if (val < LINK_MINWEIGHT) {
650    log_Printf(LogWARN, "Link weights must not be less than %d\n",
651              LINK_MINWEIGHT);
652    return 1;
653  }
654  arg->cx->mp.weight = val;
655  return 0;
656}
657
658int
659mp_ShowStatus(struct cmdargs const *arg)
660{
661  struct mp *mp = &arg->bundle->ncp.mp;
662
663  prompt_Printf(arg->prompt, "Multilink is %sactive\n", mp->active ? "" : "in");
664  if (mp->active) {
665    struct mbuf *m;
666    int bufs = 0;
667
668    prompt_Printf(arg->prompt, "Socket:         %s\n",
669                  mp->server.socket.sun_path);
670    for (m = mp->inbufs; m; m = m->pnext)
671      bufs++;
672    prompt_Printf(arg->prompt, "Pending frags:  %d\n", bufs);
673  }
674
675  prompt_Printf(arg->prompt, "\nMy Side:\n");
676  if (mp->active) {
677    prompt_Printf(arg->prompt, " MRRU:          %u\n", mp->local_mrru);
678    prompt_Printf(arg->prompt, " Short Seq:     %s\n",
679                  mp->local_is12bit ? "on" : "off");
680  }
681  prompt_Printf(arg->prompt, " Discriminator: %s\n",
682                mp_Enddisc(mp->cfg.enddisc.class, mp->cfg.enddisc.address,
683                           mp->cfg.enddisc.len));
684
685  prompt_Printf(arg->prompt, "\nHis Side:\n");
686  if (mp->active) {
687    prompt_Printf(arg->prompt, " Auth Name:     %s\n", mp->peer.authname);
688    prompt_Printf(arg->prompt, " Next SEQ:      %u\n", mp->out.seq);
689    prompt_Printf(arg->prompt, " MRRU:          %u\n", mp->peer_mrru);
690    prompt_Printf(arg->prompt, " Short Seq:     %s\n",
691                  mp->peer_is12bit ? "on" : "off");
692  }
693  prompt_Printf(arg->prompt,   " Discriminator: %s\n",
694                mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address,
695                           mp->peer.enddisc.len));
696
697  prompt_Printf(arg->prompt, "\nDefaults:\n");
698
699  prompt_Printf(arg->prompt, " MRRU:          ");
700  if (mp->cfg.mrru)
701    prompt_Printf(arg->prompt, "%d (multilink enabled)\n", mp->cfg.mrru);
702  else
703    prompt_Printf(arg->prompt, "disabled\n");
704  prompt_Printf(arg->prompt, " Short Seq:     %s\n",
705                  command_ShowNegval(mp->cfg.shortseq));
706
707  return 0;
708}
709
710const char *
711mp_Enddisc(u_char c, const char *address, int len)
712{
713  static char result[100];	/* Used immediately after it's returned */
714  int f, header;
715
716  switch (c) {
717    case ENDDISC_NULL:
718      sprintf(result, "Null Class");
719      break;
720
721    case ENDDISC_LOCAL:
722      snprintf(result, sizeof result, "Local Addr: %.*s", len, address);
723      break;
724
725    case ENDDISC_IP:
726      if (len == 4)
727        snprintf(result, sizeof result, "IP %s",
728                 inet_ntoa(*(const struct in_addr *)address));
729      else
730        sprintf(result, "IP[%d] ???", len);
731      break;
732
733    case ENDDISC_MAC:
734      if (len == 6) {
735        const u_char *m = (const u_char *)address;
736        snprintf(result, sizeof result, "MAC %02x:%02x:%02x:%02x:%02x:%02x",
737                 m[0], m[1], m[2], m[3], m[4], m[5]);
738      } else
739        sprintf(result, "MAC[%d] ???", len);
740      break;
741
742    case ENDDISC_MAGIC:
743      sprintf(result, "Magic: 0x");
744      header = strlen(result);
745      if (len > sizeof result - header - 1)
746        len = sizeof result - header - 1;
747      for (f = 0; f < len; f++)
748        sprintf(result + header + 2 * f, "%02x", address[f]);
749      break;
750
751    case ENDDISC_PSN:
752      snprintf(result, sizeof result, "PSN: %.*s", len, address);
753      break;
754
755     default:
756      sprintf(result, "%d: ", (int)c);
757      header = strlen(result);
758      if (len > sizeof result - header - 1)
759        len = sizeof result - header - 1;
760      for (f = 0; f < len; f++)
761        sprintf(result + header + 2 * f, "%02x", address[f]);
762      break;
763  }
764  return result;
765}
766
767int
768mp_SetEnddisc(struct cmdargs const *arg)
769{
770  struct mp *mp = &arg->bundle->ncp.mp;
771  struct in_addr addr;
772
773  if (bundle_Phase(arg->bundle) != PHASE_DEAD) {
774    log_Printf(LogWARN, "set enddisc: Only available at phase DEAD\n");
775    return 1;
776  }
777
778  if (arg->argc == arg->argn) {
779    mp->cfg.enddisc.class = 0;
780    *mp->cfg.enddisc.address = '\0';
781    mp->cfg.enddisc.len = 0;
782  } else if (arg->argc > arg->argn) {
783    if (!strcasecmp(arg->argv[arg->argn], "label")) {
784      mp->cfg.enddisc.class = ENDDISC_LOCAL;
785      strcpy(mp->cfg.enddisc.address, arg->bundle->cfg.label);
786      mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address);
787    } else if (!strcasecmp(arg->argv[arg->argn], "ip")) {
788      if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY)
789        addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr;
790      else
791        addr = arg->bundle->ncp.ipcp.my_ip;
792      memcpy(mp->cfg.enddisc.address, &addr.s_addr, sizeof addr.s_addr);
793      mp->cfg.enddisc.class = ENDDISC_IP;
794      mp->cfg.enddisc.len = sizeof arg->bundle->ncp.ipcp.my_ip.s_addr;
795    } else if (!strcasecmp(arg->argv[arg->argn], "mac")) {
796      struct sockaddr_dl hwaddr;
797      int s;
798
799      if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY)
800        addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr;
801      else
802        addr = arg->bundle->ncp.ipcp.my_ip;
803
804      s = ID0socket(AF_INET, SOCK_DGRAM, 0);
805      if (s < 0) {
806        log_Printf(LogERROR, "set enddisc: socket(): %s\n", strerror(errno));
807        return 2;
808      }
809      if (get_ether_addr(s, addr, &hwaddr)) {
810        mp->cfg.enddisc.class = ENDDISC_MAC;
811        memcpy(mp->cfg.enddisc.address, hwaddr.sdl_data + hwaddr.sdl_nlen,
812               hwaddr.sdl_alen);
813        mp->cfg.enddisc.len = hwaddr.sdl_alen;
814      } else {
815        log_Printf(LogWARN, "set enddisc: Can't locate MAC address for %s\n",
816                  inet_ntoa(addr));
817        close(s);
818        return 4;
819      }
820      close(s);
821    } else if (!strcasecmp(arg->argv[arg->argn], "magic")) {
822      int f;
823
824      randinit();
825      for (f = 0; f < 20; f += sizeof(long))
826        *(long *)(mp->cfg.enddisc.address + f) = random();
827      mp->cfg.enddisc.class = ENDDISC_MAGIC;
828      mp->cfg.enddisc.len = 20;
829    } else if (!strcasecmp(arg->argv[arg->argn], "psn")) {
830      if (arg->argc > arg->argn+1) {
831        mp->cfg.enddisc.class = ENDDISC_PSN;
832        strcpy(mp->cfg.enddisc.address, arg->argv[arg->argn+1]);
833        mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address);
834      } else {
835        log_Printf(LogWARN, "PSN endpoint requires additional data\n");
836        return 5;
837      }
838    } else {
839      log_Printf(LogWARN, "%s: Unrecognised endpoint type\n",
840                arg->argv[arg->argn]);
841      return 6;
842    }
843  }
844
845  return 0;
846}
847
848static int
849mpserver_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e,
850                   int *n)
851{
852  struct mpserver *s = descriptor2mpserver(d);
853  int result;
854
855  result = 0;
856  if (s->send.dl != NULL) {
857    /* We've connect()ed */
858    if (!link_QueueLen(&s->send.dl->physical->link) &&
859        !s->send.dl->physical->out) {
860      /* Only send if we've transmitted all our data (i.e. the ConfigAck) */
861      result -= datalink_RemoveFromSet(s->send.dl, r, w, e);
862      bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
863      s->send.dl = NULL;
864      s->fd = -1;
865    } else
866      /* Never read from a datalink that's on death row ! */
867      result -= datalink_RemoveFromSet(s->send.dl, r, NULL, NULL);
868  } else if (r && s->fd >= 0) {
869    if (*n < s->fd + 1)
870      *n = s->fd + 1;
871    FD_SET(s->fd, r);
872    log_Printf(LogTIMER, "mp: fdset(r) %d\n", s->fd);
873    result++;
874  }
875  return result;
876}
877
878static int
879mpserver_IsSet(struct descriptor *d, const fd_set *fdset)
880{
881  struct mpserver *s = descriptor2mpserver(d);
882  return s->fd >= 0 && FD_ISSET(s->fd, fdset);
883}
884
885static void
886mpserver_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
887{
888  struct mpserver *s = descriptor2mpserver(d);
889  struct sockaddr in;
890  int fd, size;
891
892  size = sizeof in;
893  fd = accept(s->fd, &in, &size);
894  if (fd < 0) {
895    log_Printf(LogERROR, "mpserver_Read: accept(): %s\n", strerror(errno));
896    return;
897  }
898
899  if (in.sa_family == AF_LOCAL)
900    bundle_ReceiveDatalink(bundle, fd, (struct sockaddr_un *)&in);
901  else
902    close(fd);
903}
904
905static int
906mpserver_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
907{
908  /* We never want to write here ! */
909  log_Printf(LogALERT, "mpserver_Write: Internal error: Bad call !\n");
910  return 0;
911}
912
913void
914mpserver_Init(struct mpserver *s)
915{
916  s->desc.type = MPSERVER_DESCRIPTOR;
917  s->desc.UpdateSet = mpserver_UpdateSet;
918  s->desc.IsSet = mpserver_IsSet;
919  s->desc.Read = mpserver_Read;
920  s->desc.Write = mpserver_Write;
921  s->send.dl = NULL;
922  s->fd = -1;
923  memset(&s->socket, '\0', sizeof s->socket);
924}
925
926int
927mpserver_Open(struct mpserver *s, struct peerid *peer)
928{
929  int f, l;
930  mode_t mask;
931
932  if (s->fd != -1) {
933    log_Printf(LogALERT, "Internal error !  mpserver already open\n");
934    mpserver_Close(s);
935  }
936
937  l = snprintf(s->socket.sun_path, sizeof s->socket.sun_path, "%sppp-%s-%02x-",
938               _PATH_VARRUN, peer->authname, peer->enddisc.class);
939
940  for (f = 0; f < peer->enddisc.len && l < sizeof s->socket.sun_path - 2; f++) {
941    snprintf(s->socket.sun_path + l, sizeof s->socket.sun_path - l,
942             "%02x", *(u_char *)(peer->enddisc.address+f));
943    l += 2;
944  }
945
946  s->socket.sun_family = AF_LOCAL;
947  s->socket.sun_len = sizeof s->socket;
948  s->fd = ID0socket(PF_LOCAL, SOCK_STREAM, 0);
949  if (s->fd < 0) {
950    log_Printf(LogERROR, "mpserver: socket: %s\n", strerror(errno));
951    return MPSERVER_FAILED;
952  }
953
954  setsockopt(s->fd, SOL_SOCKET, SO_REUSEADDR, (struct sockaddr *)&s->socket,
955             sizeof s->socket);
956  mask = umask(0177);
957  if (ID0bind_un(s->fd, &s->socket) < 0) {
958    if (errno != EADDRINUSE) {
959      log_Printf(LogPHASE, "mpserver: can't create bundle socket %s (%s)\n",
960                s->socket.sun_path, strerror(errno));
961      umask(mask);
962      close(s->fd);
963      s->fd = -1;
964      return MPSERVER_FAILED;
965    }
966    umask(mask);
967    if (ID0connect_un(s->fd, &s->socket) < 0) {
968      log_Printf(LogPHASE, "mpserver: can't connect to bundle socket %s (%s)\n",
969                s->socket.sun_path, strerror(errno));
970      if (errno == ECONNREFUSED)
971        log_Printf(LogPHASE, "          Has the previous server died badly ?\n");
972      close(s->fd);
973      s->fd = -1;
974      return MPSERVER_FAILED;
975    }
976
977    /* Donate our link to the other guy */
978    return MPSERVER_CONNECTED;
979  }
980
981  /* Listen for other ppp invocations that want to donate links */
982  if (listen(s->fd, 5) != 0) {
983    log_Printf(LogERROR, "mpserver: Unable to listen to socket"
984              " - BUNDLE overload?\n");
985    mpserver_Close(s);
986  }
987
988  return MPSERVER_LISTENING;
989}
990
991void
992mpserver_Close(struct mpserver *s)
993{
994  if (s->send.dl != NULL) {
995    bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
996    s->send.dl = NULL;
997    s->fd = -1;
998  } else if (s->fd >= 0) {
999    close(s->fd);
1000    if (ID0unlink(s->socket.sun_path) == -1)
1001      log_Printf(LogERROR, "%s: Failed to remove: %s\n", s->socket.sun_path,
1002                strerror(errno));
1003    memset(&s->socket, '\0', sizeof s->socket);
1004    s->fd = -1;
1005  }
1006}
1007
1008void
1009mp_LinkLost(struct mp *mp, struct datalink *dl)
1010{
1011  if (mp->seq.min_in == dl->mp.seq)
1012    /* We've lost the link that's holding everything up ! */
1013    mp_Input(mp, NULL, NULL);
1014}
1015