datalink.c revision 36928 
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: datalink.c,v 1.7 1998/05/29 18:32:10 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 <sys/un.h>
34
35#include <ctype.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <string.h>
39#include <sys/uio.h>
40#include <termios.h>
41#include <unistd.h>
42
43#include "mbuf.h"
44#include "log.h"
45#include "defs.h"
46#include "timer.h"
47#include "fsm.h"
48#include "lcp.h"
49#include "descriptor.h"
50#include "lqr.h"
51#include "hdlc.h"
52#include "async.h"
53#include "throughput.h"
54#include "ccp.h"
55#include "link.h"
56#include "physical.h"
57#include "iplist.h"
58#include "slcompress.h"
59#include "ipcp.h"
60#include "filter.h"
61#include "mp.h"
62#include "bundle.h"
63#include "chat.h"
64#include "auth.h"
65#include "modem.h"
66#include "prompt.h"
67#include "lcpproto.h"
68#include "pap.h"
69#include "chap.h"
70#include "command.h"
71#include "datalink.h"
72
73static void datalink_LoginDone(struct datalink *);
74static void datalink_NewState(struct datalink *, int);
75
76static void
77datalink_OpenTimeout(void *v)
78{
79  struct datalink *dl = (struct datalink *)v;
80
81  timer_Stop(&dl->dial_timer);
82  if (dl->state == DATALINK_OPENING)
83    log_Printf(LogPHASE, "%s: Redial timer expired.\n", dl->name);
84}
85
86static void
87datalink_StartDialTimer(struct datalink *dl, int Timeout)
88{
89  timer_Stop(&dl->dial_timer);
90
91  if (Timeout) {
92    if (Timeout > 0)
93      dl->dial_timer.load = Timeout * SECTICKS;
94    else
95      dl->dial_timer.load = (random() % DIAL_TIMEOUT) * SECTICKS;
96    dl->dial_timer.func = datalink_OpenTimeout;
97    dl->dial_timer.name = "dial";
98    dl->dial_timer.arg = dl;
99    timer_Start(&dl->dial_timer);
100    if (dl->state == DATALINK_OPENING)
101      log_Printf(LogPHASE, "%s: Enter pause (%d) for redialing.\n",
102                dl->name, Timeout);
103  }
104}
105
106static void
107datalink_HangupDone(struct datalink *dl)
108{
109  if (dl->physical->type == PHYS_DEDICATED && !dl->bundle->CleaningUp &&
110      physical_GetFD(dl->physical) != -1) {
111    /* Don't close our modem if the link is dedicated */
112    datalink_LoginDone(dl);
113    return;
114  }
115
116  modem_Close(dl->physical);
117  dl->phone.chosen = "N/A";
118
119  if (dl->bundle->CleaningUp ||
120      (dl->physical->type == PHYS_DIRECT) ||
121      ((!dl->dial_tries || (dl->dial_tries < 0 && !dl->reconnect_tries)) &&
122       !(dl->physical->type & (PHYS_DDIAL|PHYS_DEDICATED)))) {
123    datalink_NewState(dl, DATALINK_CLOSED);
124    dl->dial_tries = -1;
125    dl->reconnect_tries = 0;
126    bundle_LinkClosed(dl->bundle, dl);
127    if (!dl->bundle->CleaningUp)
128      datalink_StartDialTimer(dl, dl->cfg.dial.timeout);
129  } else {
130    datalink_NewState(dl, DATALINK_OPENING);
131    if (dl->dial_tries < 0) {
132      datalink_StartDialTimer(dl, dl->cfg.reconnect.timeout);
133      dl->dial_tries = dl->cfg.dial.max;
134      dl->reconnect_tries--;
135    } else {
136      if (dl->phone.next == NULL)
137        datalink_StartDialTimer(dl, dl->cfg.dial.timeout);
138      else
139        datalink_StartDialTimer(dl, dl->cfg.dial.next_timeout);
140    }
141  }
142}
143
144static const char *
145datalink_ChoosePhoneNumber(struct datalink *dl)
146{
147  char *phone;
148
149  if (dl->phone.alt == NULL) {
150    if (dl->phone.next == NULL) {
151      strncpy(dl->phone.list, dl->cfg.phone.list, sizeof dl->phone.list - 1);
152      dl->phone.list[sizeof dl->phone.list - 1] = '\0';
153      dl->phone.next = dl->phone.list;
154    }
155    dl->phone.alt = strsep(&dl->phone.next, ":");
156  }
157  phone = strsep(&dl->phone.alt, "|");
158  dl->phone.chosen = *phone ? phone : "[NONE]";
159  if (*phone)
160    log_Printf(LogPHASE, "Phone: %s\n", phone);
161  return phone;
162}
163
164static void
165datalink_LoginDone(struct datalink *dl)
166{
167  if (!dl->script.packetmode) {
168    dl->dial_tries = -1;
169    datalink_NewState(dl, DATALINK_READY);
170  } else if (modem_Raw(dl->physical, dl->bundle) < 0) {
171    dl->dial_tries = 0;
172    log_Printf(LogWARN, "datalink_LoginDone: Not connected.\n");
173    if (dl->script.run) {
174      datalink_NewState(dl, DATALINK_HANGUP);
175      modem_Offline(dl->physical);
176      chat_Init(&dl->chat, dl->physical, dl->cfg.script.hangup, 1, NULL);
177    } else {
178      if (dl->physical->type == PHYS_DEDICATED)
179        /* force a redial timeout */
180        modem_Close(dl->physical);
181      datalink_HangupDone(dl);
182    }
183  } else {
184    dl->dial_tries = -1;
185
186    hdlc_Init(&dl->physical->hdlc, &dl->physical->link.lcp);
187    async_Init(&dl->physical->async);
188
189    lcp_Setup(&dl->physical->link.lcp, dl->state == DATALINK_READY ?
190              0 : dl->physical->link.lcp.cfg.openmode);
191    ccp_Setup(&dl->physical->link.ccp);
192
193    datalink_NewState(dl, DATALINK_LCP);
194    fsm_Up(&dl->physical->link.lcp.fsm);
195    fsm_Open(&dl->physical->link.lcp.fsm);
196  }
197}
198
199static int
200datalink_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e,
201                   int *n)
202{
203  struct datalink *dl = descriptor2datalink(d);
204  int result;
205
206  result = 0;
207  switch (dl->state) {
208    case DATALINK_CLOSED:
209      if ((dl->physical->type &
210           (PHYS_DIRECT|PHYS_DEDICATED|PHYS_BACKGROUND|PHYS_DDIAL)) &&
211          !bundle_IsDead(dl->bundle))
212        /*
213         * Our first time in - DEDICATED & DDIAL never come down, and
214         * DIRECT & BACKGROUND get deleted when they enter DATALINK_CLOSED.
215         * Go to DATALINK_OPENING via datalink_Up() and fall through.
216         */
217        datalink_Up(dl, 1, 1);
218      else
219        break;
220      /* fall through */
221
222    case DATALINK_OPENING:
223      if (dl->dial_timer.state != TIMER_RUNNING) {
224        if (--dl->dial_tries < 0)
225          dl->dial_tries = 0;
226        if (modem_Open(dl->physical, dl->bundle) >= 0) {
227          if (dl->script.run) {
228            datalink_NewState(dl, DATALINK_DIAL);
229            chat_Init(&dl->chat, dl->physical, dl->cfg.script.dial, 1,
230                      datalink_ChoosePhoneNumber(dl));
231            if (!(dl->physical->type & (PHYS_DDIAL|PHYS_DEDICATED)) &&
232                dl->cfg.dial.max)
233              log_Printf(LogCHAT, "%s: Dial attempt %u of %d\n",
234                        dl->name, dl->cfg.dial.max - dl->dial_tries,
235                        dl->cfg.dial.max);
236            return datalink_UpdateSet(d, r, w, e, n);
237          } else
238            datalink_LoginDone(dl);
239        } else {
240          if (!(dl->physical->type & (PHYS_DDIAL|PHYS_DEDICATED)) &&
241              dl->cfg.dial.max)
242            log_Printf(LogCHAT, "Failed to open modem (attempt %u of %d)\n",
243                      dl->cfg.dial.max - dl->dial_tries, dl->cfg.dial.max);
244          else
245            log_Printf(LogCHAT, "Failed to open modem\n");
246
247          if (dl->bundle->CleaningUp ||
248              (!(dl->physical->type & (PHYS_DDIAL|PHYS_DEDICATED)) &&
249               dl->cfg.dial.max && dl->dial_tries == 0)) {
250            datalink_NewState(dl, DATALINK_CLOSED);
251            dl->reconnect_tries = 0;
252            dl->dial_tries = -1;
253            bundle_LinkClosed(dl->bundle, dl);
254          }
255          if (!dl->bundle->CleaningUp)
256            datalink_StartDialTimer(dl, dl->cfg.dial.timeout);
257        }
258      }
259      break;
260
261    case DATALINK_HANGUP:
262    case DATALINK_DIAL:
263    case DATALINK_LOGIN:
264      result = descriptor_UpdateSet(&dl->chat.desc, r, w, e, n);
265      switch (dl->chat.state) {
266        case CHAT_DONE:
267          /* script succeeded */
268          chat_Destroy(&dl->chat);
269          switch(dl->state) {
270            case DATALINK_HANGUP:
271              datalink_HangupDone(dl);
272              break;
273            case DATALINK_DIAL:
274              datalink_NewState(dl, DATALINK_LOGIN);
275              chat_Init(&dl->chat, dl->physical, dl->cfg.script.login, 0, NULL);
276              return datalink_UpdateSet(d, r, w, e, n);
277            case DATALINK_LOGIN:
278              datalink_LoginDone(dl);
279              break;
280          }
281          break;
282        case CHAT_FAILED:
283          /* Going down - script failed */
284          log_Printf(LogWARN, "Chat script failed\n");
285          chat_Destroy(&dl->chat);
286          switch(dl->state) {
287            case DATALINK_HANGUP:
288              datalink_HangupDone(dl);
289              break;
290            case DATALINK_DIAL:
291            case DATALINK_LOGIN:
292              datalink_NewState(dl, DATALINK_HANGUP);
293              modem_Offline(dl->physical);
294              chat_Init(&dl->chat, dl->physical, dl->cfg.script.hangup, 1, NULL);
295              return datalink_UpdateSet(d, r, w, e, n);
296          }
297          break;
298      }
299      break;
300
301    case DATALINK_READY:
302    case DATALINK_LCP:
303    case DATALINK_AUTH:
304    case DATALINK_OPEN:
305      result = descriptor_UpdateSet(&dl->physical->desc, r, w, e, n);
306      break;
307  }
308  return result;
309}
310
311int
312datalink_RemoveFromSet(struct datalink *dl, fd_set *r, fd_set *w, fd_set *e)
313{
314  return physical_RemoveFromSet(dl->physical, r, w, e);
315}
316
317static int
318datalink_IsSet(struct descriptor *d, const fd_set *fdset)
319{
320  struct datalink *dl = descriptor2datalink(d);
321
322  switch (dl->state) {
323    case DATALINK_CLOSED:
324    case DATALINK_OPENING:
325      break;
326
327    case DATALINK_HANGUP:
328    case DATALINK_DIAL:
329    case DATALINK_LOGIN:
330      return descriptor_IsSet(&dl->chat.desc, fdset);
331
332    case DATALINK_READY:
333    case DATALINK_LCP:
334    case DATALINK_AUTH:
335    case DATALINK_OPEN:
336      return descriptor_IsSet(&dl->physical->desc, fdset);
337  }
338  return 0;
339}
340
341static void
342datalink_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
343{
344  struct datalink *dl = descriptor2datalink(d);
345
346  switch (dl->state) {
347    case DATALINK_CLOSED:
348    case DATALINK_OPENING:
349      break;
350
351    case DATALINK_HANGUP:
352    case DATALINK_DIAL:
353    case DATALINK_LOGIN:
354      descriptor_Read(&dl->chat.desc, bundle, fdset);
355      break;
356
357    case DATALINK_READY:
358    case DATALINK_LCP:
359    case DATALINK_AUTH:
360    case DATALINK_OPEN:
361      descriptor_Read(&dl->physical->desc, bundle, fdset);
362      break;
363  }
364}
365
366static void
367datalink_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
368{
369  struct datalink *dl = descriptor2datalink(d);
370
371  switch (dl->state) {
372    case DATALINK_CLOSED:
373    case DATALINK_OPENING:
374      break;
375
376    case DATALINK_HANGUP:
377    case DATALINK_DIAL:
378    case DATALINK_LOGIN:
379      descriptor_Write(&dl->chat.desc, bundle, fdset);
380      break;
381
382    case DATALINK_READY:
383    case DATALINK_LCP:
384    case DATALINK_AUTH:
385    case DATALINK_OPEN:
386      descriptor_Write(&dl->physical->desc, bundle, fdset);
387      break;
388  }
389}
390
391static void
392datalink_ComeDown(struct datalink *dl, int stay)
393{
394  if (stay) {
395    dl->dial_tries = -1;
396    dl->reconnect_tries = 0;
397  }
398
399  if (dl->state != DATALINK_CLOSED && dl->state != DATALINK_HANGUP) {
400    modem_Offline(dl->physical);
401    if (dl->script.run && dl->state != DATALINK_OPENING) {
402      datalink_NewState(dl, DATALINK_HANGUP);
403      chat_Init(&dl->chat, dl->physical, dl->cfg.script.hangup, 1, NULL);
404    } else
405      datalink_HangupDone(dl);
406  }
407}
408
409static void
410datalink_LayerStart(void *v, struct fsm *fp)
411{
412  /* The given FSM is about to start up ! */
413  struct datalink *dl = (struct datalink *)v;
414
415  if (fp->proto == PROTO_LCP)
416    (*dl->parent->LayerStart)(dl->parent->object, fp);
417}
418
419static void
420datalink_LayerUp(void *v, struct fsm *fp)
421{
422  /* The given fsm is now up */
423  struct datalink *dl = (struct datalink *)v;
424
425  if (fp->proto == PROTO_LCP) {
426    datalink_GotAuthname(dl, "", 0);
427    dl->physical->link.lcp.auth_ineed = dl->physical->link.lcp.want_auth;
428    dl->physical->link.lcp.auth_iwait = dl->physical->link.lcp.his_auth;
429    if (dl->physical->link.lcp.his_auth || dl->physical->link.lcp.want_auth) {
430      if (bundle_Phase(dl->bundle) == PHASE_ESTABLISH)
431        bundle_NewPhase(dl->bundle, PHASE_AUTHENTICATE);
432      log_Printf(LogPHASE, "%s: his = %s, mine = %s\n", dl->name,
433                Auth2Nam(dl->physical->link.lcp.his_auth),
434                Auth2Nam(dl->physical->link.lcp.want_auth));
435      if (dl->physical->link.lcp.his_auth == PROTO_PAP)
436        auth_StartChallenge(&dl->pap, dl->physical, pap_SendChallenge);
437      if (dl->physical->link.lcp.want_auth == PROTO_CHAP)
438        auth_StartChallenge(&dl->chap.auth, dl->physical, chap_SendChallenge);
439    } else
440      datalink_AuthOk(dl);
441  }
442}
443
444void
445datalink_GotAuthname(struct datalink *dl, const char *name, int len)
446{
447  if (len >= sizeof dl->peer.authname)
448    len = sizeof dl->peer.authname - 1;
449  strncpy(dl->peer.authname, name, len);
450  dl->peer.authname[len] = '\0';
451}
452
453void
454datalink_AuthOk(struct datalink *dl)
455{
456  ccp_SetOpenMode(&dl->physical->link.ccp);
457
458  if (dl->physical->link.lcp.want_mrru && dl->physical->link.lcp.his_mrru) {
459    /* we've authenticated in multilink mode ! */
460    switch (mp_Up(&dl->bundle->ncp.mp, dl)) {
461      case MP_LINKSENT:
462        /* We've handed the link off to another ppp (well, we will soon) ! */
463        return;
464      case MP_UP:
465        /* First link in the bundle */
466        auth_Select(dl->bundle, dl->peer.authname, dl->physical);
467        /* fall through */
468      case MP_ADDED:
469        /* We're in multilink mode ! */
470        dl->physical->link.ccp.fsm.open_mode = OPEN_PASSIVE;	/* override */
471        break;
472      case MP_FAILED:
473        datalink_AuthNotOk(dl);
474        return;
475    }
476  } else if (bundle_Phase(dl->bundle) == PHASE_NETWORK) {
477    log_Printf(LogPHASE, "%s: Already in NETWORK phase\n", dl->name);
478    datalink_AuthNotOk(dl);
479    return;
480  } else {
481    dl->bundle->ncp.mp.peer = dl->peer;
482    ipcp_SetLink(&dl->bundle->ncp.ipcp, &dl->physical->link);
483    auth_Select(dl->bundle, dl->peer.authname, dl->physical);
484  }
485
486  fsm_Up(&dl->physical->link.ccp.fsm);
487  fsm_Open(&dl->physical->link.ccp.fsm);
488  datalink_NewState(dl, DATALINK_OPEN);
489  bundle_NewPhase(dl->bundle, PHASE_NETWORK);
490  (*dl->parent->LayerUp)(dl->parent->object, &dl->physical->link.lcp.fsm);
491}
492
493void
494datalink_AuthNotOk(struct datalink *dl)
495{
496  datalink_NewState(dl, DATALINK_LCP);
497  fsm_Close(&dl->physical->link.lcp.fsm);
498}
499
500static void
501datalink_LayerDown(void *v, struct fsm *fp)
502{
503  /* The given FSM has been told to come down */
504  struct datalink *dl = (struct datalink *)v;
505
506  if (fp->proto == PROTO_LCP) {
507    switch (dl->state) {
508      case DATALINK_OPEN:
509        peerid_Init(&dl->peer);
510        fsm_Down(&dl->physical->link.ccp.fsm);
511        fsm_Close(&dl->physical->link.ccp.fsm);
512        datalink_NewState(dl, DATALINK_LCP);  /* before parent TLD */
513        (*dl->parent->LayerDown)(dl->parent->object, fp);
514        /* fall through */
515
516      case DATALINK_AUTH:
517        timer_Stop(&dl->pap.authtimer);
518        timer_Stop(&dl->chap.auth.authtimer);
519    }
520    datalink_NewState(dl, DATALINK_LCP);
521  }
522}
523
524static void
525datalink_LayerFinish(void *v, struct fsm *fp)
526{
527  /* The given fsm is now down */
528  struct datalink *dl = (struct datalink *)v;
529
530  if (fp->proto == PROTO_LCP) {
531    if (fp->state == ST_STOPPED)
532      fsm_Close(fp);			/* back to CLOSED */
533    fsm_Down(fp);			/* Bring us to INITIAL or STARTING */
534    (*dl->parent->LayerFinish)(dl->parent->object, fp);
535    datalink_ComeDown(dl, 0);
536  } else if (fp->state == ST_CLOSED && fp->open_mode == OPEN_PASSIVE)
537    fsm_Open(fp);		/* CCP goes to ST_STOPPED */
538}
539
540struct datalink *
541datalink_Create(const char *name, struct bundle *bundle, int type)
542{
543  struct datalink *dl;
544
545  dl = (struct datalink *)malloc(sizeof(struct datalink));
546  if (dl == NULL)
547    return dl;
548
549  dl->desc.type = DATALINK_DESCRIPTOR;
550  dl->desc.UpdateSet = datalink_UpdateSet;
551  dl->desc.IsSet = datalink_IsSet;
552  dl->desc.Read = datalink_Read;
553  dl->desc.Write = datalink_Write;
554
555  dl->state = DATALINK_CLOSED;
556
557  *dl->cfg.script.dial = '\0';
558  *dl->cfg.script.login = '\0';
559  *dl->cfg.script.hangup = '\0';
560  *dl->cfg.phone.list = '\0';
561  *dl->phone.list = '\0';
562  dl->phone.next = NULL;
563  dl->phone.alt = NULL;
564  dl->phone.chosen = "N/A";
565  dl->script.run = 1;
566  dl->script.packetmode = 1;
567  mp_linkInit(&dl->mp);
568
569  dl->bundle = bundle;
570  dl->next = NULL;
571
572  memset(&dl->dial_timer, '\0', sizeof dl->dial_timer);
573
574  dl->dial_tries = 0;
575  dl->cfg.dial.max = 1;
576  dl->cfg.dial.next_timeout = DIAL_NEXT_TIMEOUT;
577  dl->cfg.dial.timeout = DIAL_TIMEOUT;
578
579  dl->reconnect_tries = 0;
580  dl->cfg.reconnect.max = 0;
581  dl->cfg.reconnect.timeout = RECONNECT_TIMEOUT;
582
583  dl->name = strdup(name);
584  peerid_Init(&dl->peer);
585  dl->parent = &bundle->fsm;
586  dl->fsmp.LayerStart = datalink_LayerStart;
587  dl->fsmp.LayerUp = datalink_LayerUp;
588  dl->fsmp.LayerDown = datalink_LayerDown;
589  dl->fsmp.LayerFinish = datalink_LayerFinish;
590  dl->fsmp.object = dl;
591
592  auth_Init(&dl->pap);
593  auth_Init(&dl->chap.auth);
594
595  if ((dl->physical = modem_Create(dl, type)) == NULL) {
596    free(dl->name);
597    free(dl);
598    return NULL;
599  }
600  chat_Init(&dl->chat, dl->physical, NULL, 1, NULL);
601
602  log_Printf(LogPHASE, "%s: Created in %s state\n",
603             dl->name, datalink_State(dl));
604
605  return dl;
606}
607
608struct datalink *
609datalink_Clone(struct datalink *odl, const char *name)
610{
611  struct datalink *dl;
612
613  dl = (struct datalink *)malloc(sizeof(struct datalink));
614  if (dl == NULL)
615    return dl;
616
617  dl->desc.type = DATALINK_DESCRIPTOR;
618  dl->desc.UpdateSet = datalink_UpdateSet;
619  dl->desc.IsSet = datalink_IsSet;
620  dl->desc.Read = datalink_Read;
621  dl->desc.Write = datalink_Write;
622
623  dl->state = DATALINK_CLOSED;
624
625  memcpy(&dl->cfg, &odl->cfg, sizeof dl->cfg);
626  mp_linkInit(&dl->mp);
627  *dl->phone.list = '\0';
628  dl->phone.next = NULL;
629  dl->phone.alt = NULL;
630  dl->phone.chosen = "N/A";
631  dl->bundle = odl->bundle;
632  dl->next = NULL;
633  memset(&dl->dial_timer, '\0', sizeof dl->dial_timer);
634  dl->dial_tries = 0;
635  dl->reconnect_tries = 0;
636  dl->name = strdup(name);
637  peerid_Init(&dl->peer);
638  dl->parent = odl->parent;
639  memcpy(&dl->fsmp, &odl->fsmp, sizeof dl->fsmp);
640  dl->fsmp.object = dl;
641  auth_Init(&dl->pap);
642  dl->pap.cfg.fsmretry = odl->pap.cfg.fsmretry;
643
644  auth_Init(&dl->chap.auth);
645  dl->chap.auth.cfg.fsmretry = odl->chap.auth.cfg.fsmretry;
646
647  if ((dl->physical = modem_Create(dl, PHYS_INTERACTIVE)) == NULL) {
648    free(dl->name);
649    free(dl);
650    return NULL;
651  }
652  memcpy(&dl->physical->cfg, &odl->physical->cfg, sizeof dl->physical->cfg);
653  memcpy(&dl->physical->link.lcp.cfg, &odl->physical->link.lcp.cfg,
654         sizeof dl->physical->link.lcp.cfg);
655  memcpy(&dl->physical->link.ccp.cfg, &odl->physical->link.ccp.cfg,
656         sizeof dl->physical->link.ccp.cfg);
657  memcpy(&dl->physical->async.cfg, &odl->physical->async.cfg,
658         sizeof dl->physical->async.cfg);
659
660  chat_Init(&dl->chat, dl->physical, NULL, 1, NULL);
661
662  log_Printf(LogPHASE, "%s: Cloned in %s state\n",
663             dl->name, datalink_State(dl));
664
665  return dl;
666}
667
668struct datalink *
669datalink_Destroy(struct datalink *dl)
670{
671  struct datalink *result;
672
673  if (dl->state != DATALINK_CLOSED) {
674    log_Printf(LogERROR, "Oops, destroying a datalink in state %s\n",
675              datalink_State(dl));
676    switch (dl->state) {
677      case DATALINK_HANGUP:
678      case DATALINK_DIAL:
679      case DATALINK_LOGIN:
680        chat_Destroy(&dl->chat);	/* Gotta blat the timers ! */
681        break;
682    }
683  }
684
685  result = dl->next;
686  modem_Destroy(dl->physical);
687  free(dl->name);
688  free(dl);
689
690  return result;
691}
692
693void
694datalink_Up(struct datalink *dl, int runscripts, int packetmode)
695{
696  if (dl->physical->type & (PHYS_DIRECT|PHYS_DEDICATED))
697    /* Ignore scripts */
698    runscripts = 0;
699
700  switch (dl->state) {
701    case DATALINK_CLOSED:
702      if (bundle_Phase(dl->bundle) == PHASE_DEAD ||
703          bundle_Phase(dl->bundle) == PHASE_TERMINATE)
704        bundle_NewPhase(dl->bundle, PHASE_ESTABLISH);
705      datalink_NewState(dl, DATALINK_OPENING);
706      dl->reconnect_tries =
707        dl->physical->type == PHYS_DIRECT ? 0 : dl->cfg.reconnect.max;
708      dl->dial_tries = dl->cfg.dial.max;
709      dl->script.run = runscripts;
710      dl->script.packetmode = packetmode;
711      break;
712
713    case DATALINK_OPENING:
714      if (!dl->script.run && runscripts)
715        dl->script.run = 1;
716      /* fall through */
717
718    case DATALINK_DIAL:
719    case DATALINK_LOGIN:
720    case DATALINK_READY:
721      if (!dl->script.packetmode && packetmode) {
722        dl->script.packetmode = 1;
723        if (dl->state == DATALINK_READY)
724          datalink_LoginDone(dl);
725      }
726      break;
727  }
728}
729
730void
731datalink_Close(struct datalink *dl, int stay)
732{
733  /* Please close */
734  switch (dl->state) {
735    case DATALINK_OPEN:
736      peerid_Init(&dl->peer);
737      fsm_Down(&dl->physical->link.ccp.fsm);
738      fsm_Close(&dl->physical->link.ccp.fsm);
739      /* fall through */
740
741    case DATALINK_AUTH:
742    case DATALINK_LCP:
743      fsm_Close(&dl->physical->link.lcp.fsm);
744      if (stay) {
745        dl->dial_tries = -1;
746        dl->reconnect_tries = 0;
747      }
748      break;
749
750    default:
751      datalink_ComeDown(dl, stay);
752  }
753}
754
755void
756datalink_Down(struct datalink *dl, int stay)
757{
758  /* Carrier is lost */
759  switch (dl->state) {
760    case DATALINK_OPEN:
761      peerid_Init(&dl->peer);
762      fsm_Down(&dl->physical->link.ccp.fsm);
763      fsm_Close(&dl->physical->link.ccp.fsm);
764      /* fall through */
765
766    case DATALINK_AUTH:
767    case DATALINK_LCP:
768      if (dl->physical->link.lcp.fsm.state == ST_STOPPED)
769        fsm_Close(&dl->physical->link.lcp.fsm);		/* back to CLOSED */
770      fsm_Down(&dl->physical->link.lcp.fsm);
771      if (stay)
772        fsm_Close(&dl->physical->link.lcp.fsm);
773      else
774        fsm_Open(&dl->physical->link.ccp.fsm);
775      /* fall through */
776
777    default:
778      datalink_ComeDown(dl, stay);
779  }
780}
781
782void
783datalink_StayDown(struct datalink *dl)
784{
785  dl->reconnect_tries = 0;
786}
787
788int
789datalink_Show(struct cmdargs const *arg)
790{
791  prompt_Printf(arg->prompt, "Name: %s\n", arg->cx->name);
792  prompt_Printf(arg->prompt, " State:            %s\n",
793                datalink_State(arg->cx));
794  prompt_Printf(arg->prompt, " CHAP Encryption:  %s\n",
795                arg->cx->chap.using_MSChap ? "MSChap" : "MD5" );
796  prompt_Printf(arg->prompt, " Peer name:        ");
797  if (*arg->cx->peer.authname)
798    prompt_Printf(arg->prompt, "%s\n", arg->cx->peer.authname);
799  else if (arg->cx->state == DATALINK_OPEN)
800    prompt_Printf(arg->prompt, "None requested\n");
801  else
802    prompt_Printf(arg->prompt, "N/A\n");
803  prompt_Printf(arg->prompt, " Discriminator:    %s\n",
804                mp_Enddisc(arg->cx->peer.enddisc.class,
805                           arg->cx->peer.enddisc.address,
806                           arg->cx->peer.enddisc.len));
807
808  prompt_Printf(arg->prompt, "\nDefaults:\n");
809  prompt_Printf(arg->prompt, " Phone List:       %s\n",
810                arg->cx->cfg.phone.list);
811  if (arg->cx->cfg.dial.max)
812    prompt_Printf(arg->prompt, " Dial tries:       %d, delay ",
813                  arg->cx->cfg.dial.max);
814  else
815    prompt_Printf(arg->prompt, " Dial tries:       infinite, delay ");
816  if (arg->cx->cfg.dial.next_timeout > 0)
817    prompt_Printf(arg->prompt, "%ds/", arg->cx->cfg.dial.next_timeout);
818  else
819    prompt_Printf(arg->prompt, "random/");
820  if (arg->cx->cfg.dial.timeout > 0)
821    prompt_Printf(arg->prompt, "%ds\n", arg->cx->cfg.dial.timeout);
822  else
823    prompt_Printf(arg->prompt, "random\n");
824  prompt_Printf(arg->prompt, " Reconnect tries:  %d, delay ",
825                arg->cx->cfg.reconnect.max);
826  if (arg->cx->cfg.reconnect.timeout > 0)
827    prompt_Printf(arg->prompt, "%ds\n", arg->cx->cfg.reconnect.timeout);
828  else
829    prompt_Printf(arg->prompt, "random\n");
830  prompt_Printf(arg->prompt, " Dial Script:      %s\n",
831                arg->cx->cfg.script.dial);
832  prompt_Printf(arg->prompt, " Login Script:     %s\n",
833                arg->cx->cfg.script.login);
834  prompt_Printf(arg->prompt, " Hangup Script:    %s\n",
835                arg->cx->cfg.script.hangup);
836  return 0;
837}
838
839int
840datalink_SetReconnect(struct cmdargs const *arg)
841{
842  if (arg->argc == arg->argn+2) {
843    arg->cx->cfg.reconnect.timeout = atoi(arg->argv[arg->argn]);
844    arg->cx->cfg.reconnect.max = atoi(arg->argv[arg->argn+1]);
845    return 0;
846  }
847  return -1;
848}
849
850int
851datalink_SetRedial(struct cmdargs const *arg)
852{
853  int timeout;
854  int tries;
855  char *dot;
856
857  if (arg->argc == arg->argn+1 || arg->argc == arg->argn+2) {
858    if (strncasecmp(arg->argv[arg->argn], "random", 6) == 0 &&
859	(arg->argv[arg->argn][6] == '\0' || arg->argv[arg->argn][6] == '.')) {
860      arg->cx->cfg.dial.timeout = -1;
861      randinit();
862    } else {
863      timeout = atoi(arg->argv[arg->argn]);
864
865      if (timeout >= 0)
866	arg->cx->cfg.dial.timeout = timeout;
867      else {
868	log_Printf(LogWARN, "Invalid redial timeout\n");
869	return -1;
870      }
871    }
872
873    dot = strchr(arg->argv[arg->argn], '.');
874    if (dot) {
875      if (strcasecmp(++dot, "random") == 0) {
876	arg->cx->cfg.dial.next_timeout = -1;
877	randinit();
878      } else {
879	timeout = atoi(dot);
880	if (timeout >= 0)
881	  arg->cx->cfg.dial.next_timeout = timeout;
882	else {
883	  log_Printf(LogWARN, "Invalid next redial timeout\n");
884	  return -1;
885	}
886      }
887    } else
888      /* Default next timeout */
889      arg->cx->cfg.dial.next_timeout = DIAL_NEXT_TIMEOUT;
890
891    if (arg->argc == arg->argn+2) {
892      tries = atoi(arg->argv[arg->argn+1]);
893
894      if (tries >= 0) {
895	arg->cx->cfg.dial.max = tries;
896      } else {
897	log_Printf(LogWARN, "Invalid retry value\n");
898	return 1;
899      }
900    }
901    return 0;
902  }
903  return -1;
904}
905
906static const char *states[] = {
907  "closed",
908  "opening",
909  "hangup",
910  "dial",
911  "login",
912  "ready",
913  "lcp",
914  "auth",
915  "open"
916};
917
918const char *
919datalink_State(struct datalink *dl)
920{
921  if (dl->state < 0 || dl->state >= sizeof states / sizeof states[0])
922    return "unknown";
923  return states[dl->state];
924}
925
926static void
927datalink_NewState(struct datalink *dl, int state)
928{
929  if (state != dl->state) {
930    if (state >= 0 && state < sizeof states / sizeof states[0]) {
931      log_Printf(LogPHASE, "%s: %s -> %s\n", dl->name, datalink_State(dl),
932                 states[state]);
933      dl->state = state;
934    } else
935      log_Printf(LogERROR, "%s: Can't enter state %d !\n", dl->name, state);
936  }
937}
938
939struct datalink *
940iov2datalink(struct bundle *bundle, struct iovec *iov, int *niov, int maxiov,
941             int fd)
942{
943  struct datalink *dl, *cdl;
944  u_int retry;
945  char *oname;
946
947  dl = (struct datalink *)iov[(*niov)++].iov_base;
948  dl->name = iov[*niov].iov_base;
949
950  if (dl->name[DATALINK_MAXNAME-1]) {
951    dl->name[DATALINK_MAXNAME-1] = '\0';
952    if (strlen(dl->name) == DATALINK_MAXNAME - 1)
953      log_Printf(LogWARN, "Datalink name truncated to \"%s\"\n", dl->name);
954  }
955
956  /* Make sure the name is unique ! */
957  oname = NULL;
958  do {
959    for (cdl = bundle->links; cdl; cdl = cdl->next)
960      if (!strcasecmp(dl->name, cdl->name)) {
961        if (oname)
962          free(datalink_NextName(dl));
963        else
964          oname = datalink_NextName(dl);
965        break;	/* Keep renaming 'till we have no conflicts */
966      }
967  } while (cdl);
968
969  if (oname) {
970    log_Printf(LogPHASE, "Rename link %s to %s\n", oname, dl->name);
971    free(oname);
972  } else {
973    dl->name = strdup(dl->name);
974    free(iov[*niov].iov_base);
975  }
976  (*niov)++;
977
978  dl->desc.type = DATALINK_DESCRIPTOR;
979  dl->desc.UpdateSet = datalink_UpdateSet;
980  dl->desc.IsSet = datalink_IsSet;
981  dl->desc.Read = datalink_Read;
982  dl->desc.Write = datalink_Write;
983
984  mp_linkInit(&dl->mp);
985  *dl->phone.list = '\0';
986  dl->phone.next = NULL;
987  dl->phone.alt = NULL;
988  dl->phone.chosen = "N/A";
989
990  dl->bundle = bundle;
991  dl->next = NULL;
992  memset(&dl->dial_timer, '\0', sizeof dl->dial_timer);
993  dl->dial_tries = 0;
994  dl->reconnect_tries = 0;
995  dl->parent = &bundle->fsm;
996  dl->fsmp.LayerStart = datalink_LayerStart;
997  dl->fsmp.LayerUp = datalink_LayerUp;
998  dl->fsmp.LayerDown = datalink_LayerDown;
999  dl->fsmp.LayerFinish = datalink_LayerFinish;
1000  dl->fsmp.object = dl;
1001
1002  retry = dl->pap.cfg.fsmretry;
1003  auth_Init(&dl->pap);
1004  dl->pap.cfg.fsmretry = retry;
1005
1006  retry = dl->chap.auth.cfg.fsmretry;
1007  auth_Init(&dl->chap.auth);
1008  dl->chap.auth.cfg.fsmretry = retry;
1009
1010  dl->physical = iov2modem(dl, iov, niov, maxiov, fd);
1011
1012  if (!dl->physical) {
1013    free(dl->name);
1014    free(dl);
1015    dl = NULL;
1016  } else {
1017    chat_Init(&dl->chat, dl->physical, NULL, 1, NULL);
1018
1019    log_Printf(LogPHASE, "%s: Transferred in %s state\n",
1020              dl->name, datalink_State(dl));
1021  }
1022
1023  return dl;
1024}
1025
1026int
1027datalink2iov(struct datalink *dl, struct iovec *iov, int *niov, int maxiov,
1028             pid_t newpid)
1029{
1030  /* If `dl' is NULL, we're allocating before a Fromiov() */
1031  int link_fd;
1032
1033  if (dl) {
1034    timer_Stop(&dl->dial_timer);
1035    timer_Stop(&dl->pap.authtimer);
1036    timer_Stop(&dl->chap.auth.authtimer);
1037  }
1038
1039  if (*niov >= maxiov - 1) {
1040    log_Printf(LogERROR, "Toiov: No room for datalink !\n");
1041    if (dl) {
1042      free(dl->name);
1043      free(dl);
1044    }
1045    return -1;
1046  }
1047
1048  iov[*niov].iov_base = dl ? dl : malloc(sizeof *dl);
1049  iov[(*niov)++].iov_len = sizeof *dl;
1050  iov[*niov].iov_base =
1051    dl ? realloc(dl->name, DATALINK_MAXNAME) : malloc(DATALINK_MAXNAME);
1052  iov[(*niov)++].iov_len = DATALINK_MAXNAME;
1053
1054  link_fd = modem2iov(dl ? dl->physical : NULL, iov, niov, maxiov, newpid);
1055
1056  if (link_fd == -1 && dl) {
1057    free(dl->name);
1058    free(dl);
1059  }
1060
1061  return link_fd;
1062}
1063
1064void
1065datalink_Rename(struct datalink *dl, const char *name)
1066{
1067  free(dl->name);
1068  dl->physical->link.name = dl->name = strdup(name);
1069}
1070
1071char *
1072datalink_NextName(struct datalink *dl)
1073{
1074  int f, n;
1075  char *name, *oname;
1076
1077  n = strlen(dl->name);
1078  name = (char *)malloc(n+3);
1079  for (f = n - 1; f >= 0; f--)
1080    if (!isdigit(dl->name[f]))
1081      break;
1082  n = sprintf(name, "%.*s-", dl->name[f] == '-' ? f : f + 1, dl->name);
1083  sprintf(name + n, "%d", atoi(dl->name + f + 1) + 1);
1084  oname = dl->name;
1085  dl->name = name;
1086  /* our physical link name isn't updated (it probably isn't created yet) */
1087  return oname;
1088}
1089
1090int
1091datalink_SetMode(struct datalink *dl, int mode)
1092{
1093  if (!physical_SetMode(dl->physical, mode))
1094    return 0;
1095  if (dl->physical->type & (PHYS_DIRECT|PHYS_DEDICATED))
1096    dl->script.run = 0;
1097  if (dl->physical->type == PHYS_DIRECT)
1098    dl->reconnect_tries = 0;
1099  if (mode & (PHYS_DDIAL|PHYS_BACKGROUND) && dl->state <= DATALINK_READY)
1100    datalink_Up(dl, 1, 1);
1101  return 1;
1102}
1103