mp.c revision 43313 
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 1.17 1998/10/24 01:08:45 brian Exp $
27 */
28
29#include <sys/param.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 "ua.h"
48#include "defs.h"
49#include "command.h"
50#include "mbuf.h"
51#include "log.h"
52#include "timer.h"
53#include "fsm.h"
54#include "iplist.h"
55#include "throughput.h"
56#include "slcompress.h"
57#include "lqr.h"
58#include "hdlc.h"
59#include "ipcp.h"
60#include "auth.h"
61#include "lcp.h"
62#include "async.h"
63#include "ccp.h"
64#include "link.h"
65#include "descriptor.h"
66#include "physical.h"
67#include "chat.h"
68#include "lcpproto.h"
69#include "filter.h"
70#include "mp.h"
71#include "chap.h"
72#include "cbcp.h"
73#include "datalink.h"
74#ifndef NORADIUS
75#include "radius.h"
76#endif
77#include "bundle.h"
78#include "ip.h"
79#include "prompt.h"
80#include "id.h"
81#include "arp.h"
82
83void
84peerid_Init(struct peerid *peer)
85{
86  peer->enddisc.class = 0;
87  *peer->enddisc.address = '\0';
88  peer->enddisc.len = 0;
89  *peer->authname = '\0';
90}
91
92int
93peerid_Equal(const struct peerid *p1, const struct peerid *p2)
94{
95  return !strcmp(p1->authname, p2->authname) &&
96         p1->enddisc.class == p2->enddisc.class &&
97         p1->enddisc.len == p2->enddisc.len &&
98         !memcmp(p1->enddisc.address, p2->enddisc.address, p1->enddisc.len);
99}
100
101static u_int32_t
102inc_seq(unsigned is12bit, u_int32_t seq)
103{
104  seq++;
105  if (is12bit) {
106    if (seq & 0xfffff000)
107      seq = 0;
108  } else if (seq & 0xff000000)
109    seq = 0;
110  return seq;
111}
112
113static int
114isbefore(unsigned is12bit, u_int32_t seq1, u_int32_t seq2)
115{
116  u_int32_t max = (is12bit ? 0xfff : 0xffffff) - 0x200;
117
118  if (seq1 > max) {
119    if (seq2 < 0x200 || seq2 > seq1)
120      return 1;
121  } else if ((seq1 > 0x200 || seq2 <= max) && seq1 < seq2)
122    return 1;
123
124  return 0;
125}
126
127static int
128mp_ReadHeader(struct mp *mp, struct mbuf *m, struct mp_header *header)
129{
130  if (mp->local_is12bit) {
131    u_int16_t val;
132
133    ua_ntohs(MBUF_CTOP(m), &val);
134    if (val & 0x3000) {
135      log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
136      return 0;
137    }
138    header->begin = val & 0x8000 ? 1 : 0;
139    header->end = val & 0x4000 ? 1 : 0;
140    header->seq = val & 0x0fff;
141    return 2;
142  } else {
143    ua_ntohl(MBUF_CTOP(m), &header->seq);
144    if (header->seq & 0x3f000000) {
145      log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
146      return 0;
147    }
148    header->begin = header->seq & 0x80000000 ? 1 : 0;
149    header->end = header->seq & 0x40000000 ? 1 : 0;
150    header->seq &= 0x00ffffff;
151    return 4;
152  }
153}
154
155static void
156mp_LayerStart(void *v, struct fsm *fp)
157{
158  /* The given FSM (ccp) is about to start up ! */
159}
160
161static void
162mp_LayerUp(void *v, struct fsm *fp)
163{
164  /* The given fsm (ccp) is now up */
165}
166
167static void
168mp_LayerDown(void *v, struct fsm *fp)
169{
170  /* The given FSM (ccp) has been told to come down */
171}
172
173static void
174mp_LayerFinish(void *v, struct fsm *fp)
175{
176  /* The given fsm (ccp) is now down */
177  if (fp->state == ST_CLOSED && fp->open_mode == OPEN_PASSIVE)
178    fsm_Open(fp);		/* CCP goes to ST_STOPPED */
179}
180
181void
182mp_Init(struct mp *mp, struct bundle *bundle)
183{
184  mp->peer_is12bit = mp->local_is12bit = 0;
185  mp->peer_mrru = mp->local_mrru = 0;
186
187  peerid_Init(&mp->peer);
188
189  mp->out.seq = 0;
190  mp->out.link = 0;
191  mp->seq.min_in = 0;
192  mp->seq.next_in = 0;
193  mp->inbufs = NULL;
194  mp->bundle = bundle;
195
196  mp->link.type = MP_LINK;
197  mp->link.name = "mp";
198  mp->link.len = sizeof *mp;
199
200  throughput_init(&mp->link.throughput);
201  memset(mp->link.Queue, '\0', sizeof mp->link.Queue);
202  memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in);
203  memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out);
204
205  mp->fsmp.LayerStart = mp_LayerStart;
206  mp->fsmp.LayerUp = mp_LayerUp;
207  mp->fsmp.LayerDown = mp_LayerDown;
208  mp->fsmp.LayerFinish = mp_LayerFinish;
209  mp->fsmp.object = mp;
210
211  mpserver_Init(&mp->server);
212
213  mp->cfg.mrru = 0;
214  mp->cfg.shortseq = NEG_ENABLED|NEG_ACCEPTED;
215  mp->cfg.enddisc.class = 0;
216  *mp->cfg.enddisc.address = '\0';
217  mp->cfg.enddisc.len = 0;
218
219  lcp_Init(&mp->link.lcp, mp->bundle, &mp->link, NULL);
220  ccp_Init(&mp->link.ccp, mp->bundle, &mp->link, &mp->fsmp);
221}
222
223int
224mp_Up(struct mp *mp, struct datalink *dl)
225{
226  struct lcp *lcp = &dl->physical->link.lcp;
227
228  if (mp->active) {
229    /* We're adding a link - do a last validation on our parameters */
230    if (!peerid_Equal(&dl->peer, &mp->peer)) {
231      log_Printf(LogPHASE, "%s: Inappropriate peer !\n", dl->name);
232      return MP_FAILED;
233    }
234    if (mp->local_mrru != lcp->want_mrru ||
235        mp->peer_mrru != lcp->his_mrru ||
236        mp->local_is12bit != lcp->want_shortseq ||
237        mp->peer_is12bit != lcp->his_shortseq) {
238      log_Printf(LogPHASE, "%s: Invalid MRRU/SHORTSEQ MP parameters !\n",
239                dl->name);
240      return MP_FAILED;
241    }
242    return MP_ADDED;
243  } else {
244    /* First link in multilink mode */
245
246    mp->local_mrru = lcp->want_mrru;
247    mp->peer_mrru = lcp->his_mrru;
248    mp->local_is12bit = lcp->want_shortseq;
249    mp->peer_is12bit = lcp->his_shortseq;
250    mp->peer = dl->peer;
251
252    throughput_init(&mp->link.throughput);
253    memset(mp->link.Queue, '\0', sizeof mp->link.Queue);
254    memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in);
255    memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out);
256
257    mp->out.seq = 0;
258    mp->out.link = 0;
259    mp->seq.min_in = 0;
260    mp->seq.next_in = 0;
261
262    /*
263     * Now we create our server socket.
264     * If it already exists, join it.  Otherwise, create and own it
265     */
266    switch (mpserver_Open(&mp->server, &mp->peer)) {
267    case MPSERVER_CONNECTED:
268      log_Printf(LogPHASE, "mp: Transfer link on %s\n",
269                mp->server.socket.sun_path);
270      mp->server.send.dl = dl;		/* Defer 'till it's safe to send */
271      return MP_LINKSENT;
272    case MPSERVER_FAILED:
273      return MP_FAILED;
274    case MPSERVER_LISTENING:
275      log_Printf(LogPHASE, "mp: Listening on %s\n", mp->server.socket.sun_path);
276      log_Printf(LogPHASE, "    First link: %s\n", dl->name);
277
278      /* Re-point our IPCP layer at our MP link */
279      ipcp_SetLink(&mp->bundle->ncp.ipcp, &mp->link);
280
281      /* Our lcp's already up 'cos of the NULL parent */
282      if (ccp_SetOpenMode(&mp->link.ccp)) {
283        fsm_Up(&mp->link.ccp.fsm);
284        fsm_Open(&mp->link.ccp.fsm);
285      }
286
287      mp->active = 1;
288      break;
289    }
290  }
291
292  return MP_UP;
293}
294
295void
296mp_Down(struct mp *mp)
297{
298  if (mp->active) {
299    struct mbuf *next;
300
301    /* Don't want any more of these */
302    mpserver_Close(&mp->server);
303
304    /* CCP goes down with a bang */
305    fsm2initial(&mp->link.ccp.fsm);
306
307    /* Received fragments go in the bit-bucket */
308    while (mp->inbufs) {
309      next = mp->inbufs->pnext;
310      mbuf_Free(mp->inbufs);
311      mp->inbufs = next;
312    }
313
314    peerid_Init(&mp->peer);
315    mp->active = 0;
316  }
317}
318
319void
320mp_linkInit(struct mp_link *mplink)
321{
322  mplink->seq = 0;
323  mplink->weight = 1500;
324}
325
326void
327mp_Input(struct mp *mp, struct mbuf *m, struct physical *p)
328{
329  struct mp_header mh, h;
330  struct mbuf *q, *last;
331  int32_t seq;
332
333  /*
334   * When `m' and `p' are NULL, it means our oldest link has gone down.
335   * We want to determine a new min, and process any intermediate stuff
336   * as normal
337   */
338
339  if (m && mp_ReadHeader(mp, m, &mh) == 0) {
340    mbuf_Free(m);
341    return;
342  }
343
344  if (p) {
345    seq = p->dl->mp.seq;
346    p->dl->mp.seq = mh.seq;
347  } else
348    seq = mp->seq.min_in;
349
350  if (mp->seq.min_in == seq) {
351    /*
352     * We've received new data on the link that has our min (oldest) seq.
353     * Figure out which link now has the smallest (oldest) seq.
354     */
355    struct datalink *dl;
356
357    mp->seq.min_in = (u_int32_t)-1;
358    for (dl = mp->bundle->links; dl; dl = dl->next)
359      if (dl->state == DATALINK_OPEN &&
360          (mp->seq.min_in == -1 ||
361           isbefore(mp->local_is12bit, dl->mp.seq, mp->seq.min_in)))
362        mp->seq.min_in = dl->mp.seq;
363  }
364
365  /*
366   * Now process as many of our fragments as we can, adding our new
367   * fragment in as we go, and ordering with the oldest at the top of
368   * the queue.
369   */
370
371  if (!mp->inbufs) {
372    mp->inbufs = m;
373    m = NULL;
374  }
375
376  last = NULL;
377  seq = mp->seq.next_in;
378  q = mp->inbufs;
379  while (q) {
380    mp_ReadHeader(mp, q, &h);
381    if (m && isbefore(mp->local_is12bit, mh.seq, h.seq)) {
382      /* Our received fragment fits in before this one, so link it in */
383      if (last)
384        last->pnext = m;
385      else
386        mp->inbufs = m;
387      m->pnext = q;
388      q = m;
389      h = mh;
390      m = NULL;
391    }
392
393    if (h.seq != seq) {
394      /* we're missing something :-( */
395      if (mp->seq.min_in > seq) {
396        /* we're never gonna get it */
397        struct mbuf *next;
398
399        /* Zap all older fragments */
400        while (mp->inbufs != q) {
401          log_Printf(LogDEBUG, "Drop frag\n");
402          next = mp->inbufs->pnext;
403          mbuf_Free(mp->inbufs);
404          mp->inbufs = next;
405        }
406
407        /*
408         * Zap everything until the next `end' fragment OR just before
409         * the next `begin' fragment OR 'till seq.min_in - whichever
410         * comes first.
411         */
412        do {
413          mp_ReadHeader(mp, mp->inbufs, &h);
414          if (h.begin) {
415            /* We might be able to process this ! */
416            h.seq--;  /* We're gonna look for fragment with h.seq+1 */
417            break;
418          }
419          next = mp->inbufs->pnext;
420          log_Printf(LogDEBUG, "Drop frag %u\n", h.seq);
421          mbuf_Free(mp->inbufs);
422          mp->inbufs = next;
423        } while (mp->inbufs && (h.seq >= mp->seq.min_in || h.end));
424
425        /*
426         * Continue processing things from here.
427         * This deals with the possibility that we received a fragment
428         * on the slowest link that invalidates some of our data (because
429         * of the hole at `q'), but where there are subsequent `whole'
430         * packets that have already been received.
431         */
432
433        mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq);
434        last = NULL;
435        q = mp->inbufs;
436      } else
437        /* we may still receive the missing fragment */
438        break;
439    } else if (h.end) {
440      /* We've got something, reassemble */
441      struct mbuf **frag = &q;
442      int len;
443      u_long first = -1;
444
445      do {
446        *frag = mp->inbufs;
447        mp->inbufs = mp->inbufs->pnext;
448        len = mp_ReadHeader(mp, *frag, &h);
449        if (first == -1)
450          first = h.seq;
451        (*frag)->offset += len;
452        (*frag)->cnt -= len;
453        (*frag)->pnext = NULL;
454        if (frag == &q && !h.begin) {
455          log_Printf(LogWARN, "Oops - MP frag %lu should have a begin flag\n",
456                    (u_long)h.seq);
457          mbuf_Free(q);
458          q = NULL;
459        } else if (frag != &q && h.begin) {
460          log_Printf(LogWARN, "Oops - MP frag %lu should have an end flag\n",
461                    (u_long)h.seq - 1);
462          /*
463           * Stuff our fragment back at the front of the queue and zap
464           * our half-assembed packet.
465           */
466          (*frag)->pnext = mp->inbufs;
467          mp->inbufs = *frag;
468          *frag = NULL;
469          mbuf_Free(q);
470          q = NULL;
471          frag = &q;
472          h.end = 0;	/* just in case it's a whole packet */
473        } else
474          do
475            frag = &(*frag)->next;
476          while (*frag != NULL);
477      } while (!h.end);
478
479      if (q) {
480        u_short proto;
481        u_char ch;
482
483        q = mbuf_Read(q, &ch, 1);
484        proto = ch;
485        if (!(proto & 1)) {
486          q = mbuf_Read(q, &ch, 1);
487          proto <<= 8;
488          proto += ch;
489        }
490        if (log_IsKept(LogDEBUG))
491          log_Printf(LogDEBUG, "MP: Reassembled frags %ld-%lu, length %d\n",
492                    first, (u_long)h.seq, mbuf_Length(q));
493        hdlc_DecodePacket(mp->bundle, proto, q, &mp->link);
494      }
495
496      mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq);
497      last = NULL;
498      q = mp->inbufs;
499    } else {
500      /* Look for the next fragment */
501      seq = inc_seq(mp->local_is12bit, seq);
502      last = q;
503      q = q->pnext;
504    }
505  }
506
507  if (m) {
508    /* We still have to find a home for our new fragment */
509    last = NULL;
510    for (q = mp->inbufs; q; last = q, q = q->pnext) {
511      mp_ReadHeader(mp, q, &h);
512      if (isbefore(mp->local_is12bit, mh.seq, h.seq))
513        break;
514    }
515    /* Our received fragment fits in here */
516    if (last)
517      last->pnext = m;
518    else
519      mp->inbufs = m;
520    m->pnext = q;
521  }
522}
523
524static void
525mp_Output(struct mp *mp, struct link *l, struct mbuf *m, u_int32_t begin,
526          u_int32_t end)
527{
528  struct mbuf *mo;
529
530  /* Stuff an MP header on the front of our packet and send it */
531  mo = mbuf_Alloc(4, MB_MP);
532  mo->next = m;
533  if (mp->peer_is12bit) {
534    u_int16_t val;
535
536    val = (begin << 15) | (end << 14) | (u_int16_t)mp->out.seq;
537    ua_htons(&val, MBUF_CTOP(mo));
538    mo->cnt = 2;
539  } else {
540    u_int32_t val;
541
542    val = (begin << 31) | (end << 30) | (u_int32_t)mp->out.seq;
543    ua_htonl(&val, MBUF_CTOP(mo));
544    mo->cnt = 4;
545  }
546  if (log_IsKept(LogDEBUG))
547    log_Printf(LogDEBUG, "MP[frag %d]: Send %d bytes on link `%s'\n",
548              mp->out.seq, mbuf_Length(mo), l->name);
549  mp->out.seq = inc_seq(mp->peer_is12bit, mp->out.seq);
550
551  if (!ccp_Compress(&l->ccp, l, PRI_NORMAL, PROTO_MP, mo))
552    hdlc_Output(l, PRI_NORMAL, PROTO_MP, mo);
553}
554
555int
556mp_FillQueues(struct bundle *bundle)
557{
558  struct mp *mp = &bundle->ncp.mp;
559  struct datalink *dl, *fdl;
560  int total, add, len, thislink, nlinks;
561  u_int32_t begin, end;
562  struct mbuf *m, *mo;
563
564  thislink = nlinks = 0;
565  for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) {
566    /* Include non-open links here as mp->out.link will stay more correct */
567    if (!fdl) {
568      if (thislink == mp->out.link)
569        fdl = dl;
570      else
571        thislink++;
572    }
573    nlinks++;
574  }
575
576  if (!fdl) {
577    fdl = bundle->links;
578    if (!fdl)
579      return 0;
580    thislink = 0;
581  }
582
583  total = 0;
584  for (dl = fdl; nlinks > 0; dl = dl->next, nlinks--, thislink++) {
585    if (!dl) {
586      dl = bundle->links;
587      thislink = 0;
588    }
589
590    if (dl->state != DATALINK_OPEN)
591      continue;
592
593    if (dl->physical->out)
594      /* this link has suffered a short write.  Let it continue */
595      continue;
596
597    add = link_QueueLen(&dl->physical->link);
598    total += add;
599    if (add)
600      /* this link has got stuff already queued.  Let it continue */
601      continue;
602
603    if (!link_QueueLen(&mp->link) && !ip_FlushPacket(&mp->link, bundle))
604      /* Nothing else to send */
605      break;
606
607    m = link_Dequeue(&mp->link);
608    len = mbuf_Length(m);
609    begin = 1;
610    end = 0;
611
612    while (!end) {
613      if (dl->state == DATALINK_OPEN) {
614        if (len <= dl->mp.weight + LINK_MINWEIGHT) {
615          /*
616           * XXX: Should we remember how much of our `weight' wasn't sent
617           *      so that we can compensate next time ?
618           */
619          mo = m;
620          end = 1;
621        } else {
622          mo = mbuf_Alloc(dl->mp.weight, MB_MP);
623          mo->cnt = dl->mp.weight;
624          len -= mo->cnt;
625          m = mbuf_Read(m, MBUF_CTOP(mo), mo->cnt);
626        }
627        mp_Output(mp, &dl->physical->link, mo, begin, end);
628        begin = 0;
629      }
630
631      if (!end) {
632        nlinks--;
633        dl = dl->next;
634        if (!dl) {
635          dl = bundle->links;
636          thislink = 0;
637        } else
638          thislink++;
639      }
640    }
641  }
642  mp->out.link = thislink;		/* Start here next time */
643
644  return total;
645}
646
647int
648mp_SetDatalinkWeight(struct cmdargs const *arg)
649{
650  int val;
651
652  if (arg->argc != arg->argn+1)
653    return -1;
654
655  val = atoi(arg->argv[arg->argn]);
656  if (val < LINK_MINWEIGHT) {
657    log_Printf(LogWARN, "Link weights must not be less than %d\n",
658              LINK_MINWEIGHT);
659    return 1;
660  }
661  arg->cx->mp.weight = val;
662  return 0;
663}
664
665int
666mp_ShowStatus(struct cmdargs const *arg)
667{
668  struct mp *mp = &arg->bundle->ncp.mp;
669
670  prompt_Printf(arg->prompt, "Multilink is %sactive\n", mp->active ? "" : "in");
671  if (mp->active) {
672    struct mbuf *m;
673    int bufs = 0;
674
675    prompt_Printf(arg->prompt, "Socket:         %s\n",
676                  mp->server.socket.sun_path);
677    for (m = mp->inbufs; m; m = m->pnext)
678      bufs++;
679    prompt_Printf(arg->prompt, "Pending frags:  %d\n", bufs);
680  }
681
682  prompt_Printf(arg->prompt, "\nMy Side:\n");
683  if (mp->active) {
684    prompt_Printf(arg->prompt, " MRRU:          %u\n", mp->local_mrru);
685    prompt_Printf(arg->prompt, " Short Seq:     %s\n",
686                  mp->local_is12bit ? "on" : "off");
687  }
688  prompt_Printf(arg->prompt, " Discriminator: %s\n",
689                mp_Enddisc(mp->cfg.enddisc.class, mp->cfg.enddisc.address,
690                           mp->cfg.enddisc.len));
691
692  prompt_Printf(arg->prompt, "\nHis Side:\n");
693  if (mp->active) {
694    prompt_Printf(arg->prompt, " Auth Name:     %s\n", mp->peer.authname);
695    prompt_Printf(arg->prompt, " Next SEQ:      %u\n", mp->out.seq);
696    prompt_Printf(arg->prompt, " MRRU:          %u\n", mp->peer_mrru);
697    prompt_Printf(arg->prompt, " Short Seq:     %s\n",
698                  mp->peer_is12bit ? "on" : "off");
699  }
700  prompt_Printf(arg->prompt,   " Discriminator: %s\n",
701                mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address,
702                           mp->peer.enddisc.len));
703
704  prompt_Printf(arg->prompt, "\nDefaults:\n");
705
706  prompt_Printf(arg->prompt, " MRRU:          ");
707  if (mp->cfg.mrru)
708    prompt_Printf(arg->prompt, "%d (multilink enabled)\n", mp->cfg.mrru);
709  else
710    prompt_Printf(arg->prompt, "disabled\n");
711  prompt_Printf(arg->prompt, " Short Seq:     %s\n",
712                  command_ShowNegval(mp->cfg.shortseq));
713
714  return 0;
715}
716
717const char *
718mp_Enddisc(u_char c, const char *address, int len)
719{
720  static char result[100];	/* Used immediately after it's returned */
721  int f, header;
722
723  switch (c) {
724    case ENDDISC_NULL:
725      sprintf(result, "Null Class");
726      break;
727
728    case ENDDISC_LOCAL:
729      snprintf(result, sizeof result, "Local Addr: %.*s", len, address);
730      break;
731
732    case ENDDISC_IP:
733      if (len == 4)
734        snprintf(result, sizeof result, "IP %s",
735                 inet_ntoa(*(const struct in_addr *)address));
736      else
737        sprintf(result, "IP[%d] ???", len);
738      break;
739
740    case ENDDISC_MAC:
741      if (len == 6) {
742        const u_char *m = (const u_char *)address;
743        snprintf(result, sizeof result, "MAC %02x:%02x:%02x:%02x:%02x:%02x",
744                 m[0], m[1], m[2], m[3], m[4], m[5]);
745      } else
746        sprintf(result, "MAC[%d] ???", len);
747      break;
748
749    case ENDDISC_MAGIC:
750      sprintf(result, "Magic: 0x");
751      header = strlen(result);
752      if (len > sizeof result - header - 1)
753        len = sizeof result - header - 1;
754      for (f = 0; f < len; f++)
755        sprintf(result + header + 2 * f, "%02x", address[f]);
756      break;
757
758    case ENDDISC_PSN:
759      snprintf(result, sizeof result, "PSN: %.*s", len, address);
760      break;
761
762     default:
763      sprintf(result, "%d: ", (int)c);
764      header = strlen(result);
765      if (len > sizeof result - header - 1)
766        len = sizeof result - header - 1;
767      for (f = 0; f < len; f++)
768        sprintf(result + header + 2 * f, "%02x", address[f]);
769      break;
770  }
771  return result;
772}
773
774int
775mp_SetEnddisc(struct cmdargs const *arg)
776{
777  struct mp *mp = &arg->bundle->ncp.mp;
778  struct in_addr addr;
779
780  switch (bundle_Phase(arg->bundle)) {
781    case PHASE_DEAD:
782      break;
783    case PHASE_ESTABLISH:
784      /* Make sure none of our links are DATALINK_LCP or greater */
785      if (bundle_HighestState(arg->bundle) >= DATALINK_LCP) {
786        log_Printf(LogWARN, "enddisc: Only changable before"
787                   " LCP negotiations\n");
788        return 1;
789      }
790      break;
791    default:
792      log_Printf(LogWARN, "enddisc: Only changable at phase DEAD/ESTABLISH\n");
793      return 1;
794  }
795
796  if (arg->argc == arg->argn) {
797    mp->cfg.enddisc.class = 0;
798    *mp->cfg.enddisc.address = '\0';
799    mp->cfg.enddisc.len = 0;
800  } else if (arg->argc > arg->argn) {
801    if (!strcasecmp(arg->argv[arg->argn], "label")) {
802      mp->cfg.enddisc.class = ENDDISC_LOCAL;
803      strcpy(mp->cfg.enddisc.address, arg->bundle->cfg.label);
804      mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address);
805    } else if (!strcasecmp(arg->argv[arg->argn], "ip")) {
806      if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY)
807        addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr;
808      else
809        addr = arg->bundle->ncp.ipcp.my_ip;
810      memcpy(mp->cfg.enddisc.address, &addr.s_addr, sizeof addr.s_addr);
811      mp->cfg.enddisc.class = ENDDISC_IP;
812      mp->cfg.enddisc.len = sizeof arg->bundle->ncp.ipcp.my_ip.s_addr;
813    } else if (!strcasecmp(arg->argv[arg->argn], "mac")) {
814      struct sockaddr_dl hwaddr;
815      int s;
816
817      if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY)
818        addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr;
819      else
820        addr = arg->bundle->ncp.ipcp.my_ip;
821
822      s = ID0socket(AF_INET, SOCK_DGRAM, 0);
823      if (s < 0) {
824        log_Printf(LogERROR, "set enddisc: socket(): %s\n", strerror(errno));
825        return 2;
826      }
827      if (get_ether_addr(s, addr, &hwaddr)) {
828        mp->cfg.enddisc.class = ENDDISC_MAC;
829        memcpy(mp->cfg.enddisc.address, hwaddr.sdl_data + hwaddr.sdl_nlen,
830               hwaddr.sdl_alen);
831        mp->cfg.enddisc.len = hwaddr.sdl_alen;
832      } else {
833        log_Printf(LogWARN, "set enddisc: Can't locate MAC address for %s\n",
834                  inet_ntoa(addr));
835        close(s);
836        return 4;
837      }
838      close(s);
839    } else if (!strcasecmp(arg->argv[arg->argn], "magic")) {
840      int f;
841
842      randinit();
843      for (f = 0; f < 20; f += sizeof(long))
844        *(long *)(mp->cfg.enddisc.address + f) = random();
845      mp->cfg.enddisc.class = ENDDISC_MAGIC;
846      mp->cfg.enddisc.len = 20;
847    } else if (!strcasecmp(arg->argv[arg->argn], "psn")) {
848      if (arg->argc > arg->argn+1) {
849        mp->cfg.enddisc.class = ENDDISC_PSN;
850        strcpy(mp->cfg.enddisc.address, arg->argv[arg->argn+1]);
851        mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address);
852      } else {
853        log_Printf(LogWARN, "PSN endpoint requires additional data\n");
854        return 5;
855      }
856    } else {
857      log_Printf(LogWARN, "%s: Unrecognised endpoint type\n",
858                arg->argv[arg->argn]);
859      return 6;
860    }
861  }
862
863  return 0;
864}
865
866static int
867mpserver_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e,
868                   int *n)
869{
870  struct mpserver *s = descriptor2mpserver(d);
871  int result;
872
873  result = 0;
874  if (s->send.dl != NULL) {
875    /* We've connect()ed */
876    if (!link_QueueLen(&s->send.dl->physical->link) &&
877        !s->send.dl->physical->out) {
878      /* Only send if we've transmitted all our data (i.e. the ConfigAck) */
879      result -= datalink_RemoveFromSet(s->send.dl, r, w, e);
880      bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
881      s->send.dl = NULL;
882      s->fd = -1;
883    } else
884      /* Never read from a datalink that's on death row ! */
885      result -= datalink_RemoveFromSet(s->send.dl, r, NULL, NULL);
886  } else if (r && s->fd >= 0) {
887    if (*n < s->fd + 1)
888      *n = s->fd + 1;
889    FD_SET(s->fd, r);
890    log_Printf(LogTIMER, "mp: fdset(r) %d\n", s->fd);
891    result++;
892  }
893  return result;
894}
895
896static int
897mpserver_IsSet(struct descriptor *d, const fd_set *fdset)
898{
899  struct mpserver *s = descriptor2mpserver(d);
900  return s->fd >= 0 && FD_ISSET(s->fd, fdset);
901}
902
903static void
904mpserver_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
905{
906  struct mpserver *s = descriptor2mpserver(d);
907  struct sockaddr in;
908  int fd, size;
909
910  size = sizeof in;
911  fd = accept(s->fd, &in, &size);
912  if (fd < 0) {
913    log_Printf(LogERROR, "mpserver_Read: accept(): %s\n", strerror(errno));
914    return;
915  }
916
917  if (in.sa_family == AF_LOCAL)
918    bundle_ReceiveDatalink(bundle, fd, (struct sockaddr_un *)&in);
919  else
920    close(fd);
921}
922
923static int
924mpserver_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
925{
926  /* We never want to write here ! */
927  log_Printf(LogALERT, "mpserver_Write: Internal error: Bad call !\n");
928  return 0;
929}
930
931void
932mpserver_Init(struct mpserver *s)
933{
934  s->desc.type = MPSERVER_DESCRIPTOR;
935  s->desc.UpdateSet = mpserver_UpdateSet;
936  s->desc.IsSet = mpserver_IsSet;
937  s->desc.Read = mpserver_Read;
938  s->desc.Write = mpserver_Write;
939  s->send.dl = NULL;
940  s->fd = -1;
941  memset(&s->socket, '\0', sizeof s->socket);
942}
943
944int
945mpserver_Open(struct mpserver *s, struct peerid *peer)
946{
947  int f, l;
948  mode_t mask;
949
950  if (s->fd != -1) {
951    log_Printf(LogALERT, "Internal error !  mpserver already open\n");
952    mpserver_Close(s);
953  }
954
955  l = snprintf(s->socket.sun_path, sizeof s->socket.sun_path, "%sppp-%s-%02x-",
956               _PATH_VARRUN, peer->authname, peer->enddisc.class);
957
958  for (f = 0; f < peer->enddisc.len && l < sizeof s->socket.sun_path - 2; f++) {
959    snprintf(s->socket.sun_path + l, sizeof s->socket.sun_path - l,
960             "%02x", *(u_char *)(peer->enddisc.address+f));
961    l += 2;
962  }
963
964  s->socket.sun_family = AF_LOCAL;
965  s->socket.sun_len = sizeof s->socket;
966  s->fd = ID0socket(PF_LOCAL, SOCK_STREAM, 0);
967  if (s->fd < 0) {
968    log_Printf(LogERROR, "mpserver: socket: %s\n", strerror(errno));
969    return MPSERVER_FAILED;
970  }
971
972  setsockopt(s->fd, SOL_SOCKET, SO_REUSEADDR, (struct sockaddr *)&s->socket,
973             sizeof s->socket);
974  mask = umask(0177);
975  if (ID0bind_un(s->fd, &s->socket) < 0) {
976    if (errno != EADDRINUSE) {
977      log_Printf(LogPHASE, "mpserver: can't create bundle socket %s (%s)\n",
978                s->socket.sun_path, strerror(errno));
979      umask(mask);
980      close(s->fd);
981      s->fd = -1;
982      return MPSERVER_FAILED;
983    }
984    umask(mask);
985    if (ID0connect_un(s->fd, &s->socket) < 0) {
986      log_Printf(LogPHASE, "mpserver: can't connect to bundle socket %s (%s)\n",
987                s->socket.sun_path, strerror(errno));
988      if (errno == ECONNREFUSED)
989        log_Printf(LogPHASE, "          Has the previous server died badly ?\n");
990      close(s->fd);
991      s->fd = -1;
992      return MPSERVER_FAILED;
993    }
994
995    /* Donate our link to the other guy */
996    return MPSERVER_CONNECTED;
997  }
998
999  /* Listen for other ppp invocations that want to donate links */
1000  if (listen(s->fd, 5) != 0) {
1001    log_Printf(LogERROR, "mpserver: Unable to listen to socket"
1002              " - BUNDLE overload?\n");
1003    mpserver_Close(s);
1004  }
1005
1006  return MPSERVER_LISTENING;
1007}
1008
1009void
1010mpserver_Close(struct mpserver *s)
1011{
1012  if (s->send.dl != NULL) {
1013    bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
1014    s->send.dl = NULL;
1015    s->fd = -1;
1016  } else if (s->fd >= 0) {
1017    close(s->fd);
1018    if (ID0unlink(s->socket.sun_path) == -1)
1019      log_Printf(LogERROR, "%s: Failed to remove: %s\n", s->socket.sun_path,
1020                strerror(errno));
1021    memset(&s->socket, '\0', sizeof s->socket);
1022    s->fd = -1;
1023  }
1024}
1025
1026void
1027mp_LinkLost(struct mp *mp, struct datalink *dl)
1028{
1029  if (mp->seq.min_in == dl->mp.seq)
1030    /* We've lost the link that's holding everything up ! */
1031    mp_Input(mp, NULL, NULL);
1032}
1033
1034void
1035mp_DeleteQueue(struct mp *mp)
1036{
1037  link_DeleteQueue(&mp->link);
1038}
1039