usr.sbin/ppp/lcp.c

   1 /*-
   2  * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
   3  *          based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
   4  *                           Internet Initiative Japan, Inc (IIJ)
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/usr.sbin/ppp/lcp.c,v 1.81.2.13 2002/09/01 02:12:28 brian Exp $
  29  * $DragonFly: src/usr.sbin/ppp/lcp.c,v 1.2 2003/06/17 04:30:00 dillon Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <netinet/in.h>
  34 #include <netinet/in_systm.h>
  35 #include <netinet/ip.h>
  36 #include <sys/socket.h>
  37 #include <sys/un.h>
  38
  39 #include <signal.h>
  40 #include <stdarg.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <termios.h>
  45 #include <unistd.h>
  46
  47 #include "layer.h"
  48 #include "ua.h"
  49 #include "defs.h"
  50 #include "command.h"
  51 #include "mbuf.h"
  52 #include "log.h"
  53 #include "timer.h"
  54 #include "fsm.h"
  55 #include "iplist.h"
  56 #include "throughput.h"
  57 #include "proto.h"
  58 #include "descriptor.h"
  59 #include "lqr.h"
  60 #include "hdlc.h"
  61 #include "lcp.h"
  62 #include "ccp.h"
  63 #include "async.h"
  64 #include "link.h"
  65 #include "physical.h"
  66 #include "prompt.h"
  67 #include "slcompress.h"
  68 #include "ncpaddr.h"
  69 #include "ipcp.h"
  70 #include "filter.h"
  71 #include "mp.h"
  72 #include "chat.h"
  73 #include "auth.h"
  74 #include "chap.h"
  75 #include "cbcp.h"
  76 #include "datalink.h"
  77 #ifndef NORADIUS
  78 #include "radius.h"
  79 #endif
  80 #include "ipv6cp.h"
  81 #include "ncp.h"
  82 #include "bundle.h"
  83
  84 /* for received LQRs */
  85 struct lqrreq {
  86   struct fsm_opt_hdr hdr;
  87   u_short proto;                /* Quality protocol */
  88   u_int32_t period;             /* Reporting interval */
  89 };
  90
  91 static int LcpLayerUp(struct fsm *);
  92 static void LcpLayerDown(struct fsm *);
  93 static void LcpLayerStart(struct fsm *);
  94 static void LcpLayerFinish(struct fsm *);
  95 static void LcpInitRestartCounter(struct fsm *, int);
  96 static void LcpSendConfigReq(struct fsm *);
  97 static void LcpSentTerminateReq(struct fsm *);
  98 static void LcpSendTerminateAck(struct fsm *, u_char);
  99 static void LcpDecodeConfig(struct fsm *, u_char *, u_char *, int,
 100                             struct fsm_decode *);
 101
 102 static struct fsm_callbacks lcp_Callbacks = {
 103   LcpLayerUp,
 104   LcpLayerDown,
 105   LcpLayerStart,
 106   LcpLayerFinish,
 107   LcpInitRestartCounter,
 108   LcpSendConfigReq,
 109   LcpSentTerminateReq,
 110   LcpSendTerminateAck,
 111   LcpDecodeConfig,
 112   fsm_NullRecvResetReq,
 113   fsm_NullRecvResetAck
 114 };
 115
 116 static const char * const lcp_TimerNames[] =
 117   {"LCP restart", "LCP openmode", "LCP stopped"};
 118
 119 static const char *
 120 protoname(int proto)
 121 {
 122   static const char * const cftypes[] = {
 123     /* Check out the latest ``Assigned numbers'' rfc (1700) */
 124     NULL,
 125     "MRU",              /* 1: Maximum-Receive-Unit */
 126     "ACCMAP",           /* 2: Async-Control-Character-Map */
 127     "AUTHPROTO",        /* 3: Authentication-Protocol */
 128     "QUALPROTO",        /* 4: Quality-Protocol */
 129     "MAGICNUM",         /* 5: Magic-Number */
 130     "RESERVED",         /* 6: RESERVED */
 131     "PROTOCOMP",        /* 7: Protocol-Field-Compression */
 132     "ACFCOMP",          /* 8: Address-and-Control-Field-Compression */
 133     "FCSALT",           /* 9: FCS-Alternatives */
 134     "SDP",              /* 10: Self-Describing-Pad */
 135     "NUMMODE",          /* 11: Numbered-Mode */
 136     "MULTIPROC",        /* 12: Multi-Link-Procedure */
 137     "CALLBACK",         /* 13: Callback */
 138     "CONTIME",          /* 14: Connect-Time */
 139     "COMPFRAME",        /* 15: Compound-Frames */
 140     "NDE",              /* 16: Nominal-Data-Encapsulation */
 141     "MRRU",             /* 17: Multilink-MRRU */
 142     "SHORTSEQ",         /* 18: Multilink-Short-Sequence-Number-Header */
 143     "ENDDISC",          /* 19: Multilink-Endpoint-Discriminator */
 144     "PROPRIETRY",       /* 20: Proprietary */
 145     "DCEID",            /* 21: DCE-Identifier */
 146     "MULTIPP",          /* 22: Multi-Link-Plus-Procedure */
 147     "LDBACP",           /* 23: Link Discriminator for BACP */
 148   };
 149
 150   if (proto < 0 || proto > sizeof cftypes / sizeof *cftypes ||
 151       cftypes[proto] == NULL)
 152     return HexStr(proto, NULL, 0);
 153
 154   return cftypes[proto];
 155 }
 156
 157 int
 158 lcp_ReportStatus(struct cmdargs const *arg)
 159 {
 160   struct link *l;
 161   struct lcp *lcp;
 162
 163   l = command_ChooseLink(arg);
 164   lcp = &l->lcp;
 165
 166   prompt_Printf(arg->prompt, "%s: %s [%s]\n", l->name, lcp->fsm.name,
 167                 State2Nam(lcp->fsm.state));
 168   prompt_Printf(arg->prompt,
 169                 " his side: MRU %d, ACCMAP %08lx, PROTOCOMP %s, ACFCOMP %s,\n"
 170                 "           MAGIC %08lx, MRRU %u, SHORTSEQ %s, REJECT %04x\n",
 171                 lcp->his_mru, (u_long)lcp->his_accmap,
 172                 lcp->his_protocomp ? "on" : "off",
 173                 lcp->his_acfcomp ? "on" : "off",
 174                 (u_long)lcp->his_magic, lcp->his_mrru,
 175                 lcp->his_shortseq ? "on" : "off", lcp->his_reject);
 176   prompt_Printf(arg->prompt,
 177                 " my  side: MRU %d, ACCMAP %08lx, PROTOCOMP %s, ACFCOMP %s,\n"
 178                 "           MAGIC %08lx, MRRU %u, SHORTSEQ %s, REJECT %04x\n",
 179                 lcp->want_mru, (u_long)lcp->want_accmap,
 180                 lcp->want_protocomp ? "on" : "off",
 181                 lcp->want_acfcomp ? "on" : "off",
 182                 (u_long)lcp->want_magic, lcp->want_mrru,
 183                 lcp->want_shortseq ? "on" : "off", lcp->my_reject);
 184
 185   if (lcp->cfg.mru)
 186     prompt_Printf(arg->prompt, "\n Defaults: MRU = %d (max %d), ",
 187                   lcp->cfg.mru, lcp->cfg.max_mru);
 188   else
 189     prompt_Printf(arg->prompt, "\n Defaults: MRU = any (max %d), ",
 190                   lcp->cfg.max_mru);
 191   if (lcp->cfg.mtu)
 192     prompt_Printf(arg->prompt, "MTU = %d (max %d), ",
 193                   lcp->cfg.mtu, lcp->cfg.max_mtu);
 194   else
 195     prompt_Printf(arg->prompt, "MTU = any (max %d), ", lcp->cfg.max_mtu);
 196   prompt_Printf(arg->prompt, "ACCMAP = %08lx\n", (u_long)lcp->cfg.accmap);
 197   prompt_Printf(arg->prompt, "           LQR period = %us, ",
 198                 lcp->cfg.lqrperiod);
 199   prompt_Printf(arg->prompt, "Open Mode = %s",
 200                 lcp->cfg.openmode == OPEN_PASSIVE ? "passive" : "active");
 201   if (lcp->cfg.openmode > 0)
 202     prompt_Printf(arg->prompt, " (delay %ds)", lcp->cfg.openmode);
 203   prompt_Printf(arg->prompt, "\n           FSM retry = %us, max %u Config"
 204                 " REQ%s, %u Term REQ%s\n", lcp->cfg.fsm.timeout,
 205                 lcp->cfg.fsm.maxreq, lcp->cfg.fsm.maxreq == 1 ? "" : "s",
 206                 lcp->cfg.fsm.maxtrm, lcp->cfg.fsm.maxtrm == 1 ? "" : "s");
 207   prompt_Printf(arg->prompt, "    Ident: %s\n", lcp->cfg.ident);
 208   prompt_Printf(arg->prompt, "\n Negotiation:\n");
 209   prompt_Printf(arg->prompt, "           ACFCOMP =   %s\n",
 210                 command_ShowNegval(lcp->cfg.acfcomp));
 211   prompt_Printf(arg->prompt, "           CHAP =      %s\n",
 212                 command_ShowNegval(lcp->cfg.chap05));
 213 #ifndef NODES
 214   prompt_Printf(arg->prompt, "           CHAP80 =    %s\n",
 215                 command_ShowNegval(lcp->cfg.chap80nt));
 216   prompt_Printf(arg->prompt, "           LANMan =    %s\n",
 217                 command_ShowNegval(lcp->cfg.chap80lm));
 218   prompt_Printf(arg->prompt, "           CHAP81 =    %s\n",
 219                 command_ShowNegval(lcp->cfg.chap81));
 220 #endif
 221   prompt_Printf(arg->prompt, "           LQR =       %s\n",
 222                 command_ShowNegval(lcp->cfg.lqr));
 223   prompt_Printf(arg->prompt, "           PAP =       %s\n",
 224                 command_ShowNegval(lcp->cfg.pap));
 225   prompt_Printf(arg->prompt, "           PROTOCOMP = %s\n",
 226                 command_ShowNegval(lcp->cfg.protocomp));
 227
 228   return 0;
 229 }
 230
 231 static u_int32_t
 232 GenerateMagic(void)
 233 {
 234   /* Generate random number which will be used as magic number */
 235   randinit();
 236   return random();
 237 }
 238
 239 void
 240 lcp_SetupCallbacks(struct lcp *lcp)
 241 {
 242   lcp->fsm.fn = &lcp_Callbacks;
 243   lcp->fsm.FsmTimer.name = lcp_TimerNames[0];
 244   lcp->fsm.OpenTimer.name = lcp_TimerNames[1];
 245   lcp->fsm.StoppedTimer.name = lcp_TimerNames[2];
 246 }
 247
 248 void
 249 lcp_Init(struct lcp *lcp, struct bundle *bundle, struct link *l,
 250          const struct fsm_parent *parent)
 251 {
 252   /* Initialise ourselves */
 253   int mincode = parent ? 1 : LCP_MINMPCODE;
 254
 255   fsm_Init(&lcp->fsm, "LCP", PROTO_LCP, mincode, LCP_MAXCODE, LogLCP,
 256            bundle, l, parent, &lcp_Callbacks, lcp_TimerNames);
 257
 258   lcp->cfg.mru = 0;
 259   lcp->cfg.max_mru = MAX_MRU;
 260   lcp->cfg.mtu = 0;
 261   lcp->cfg.max_mtu = MAX_MTU;
 262   lcp->cfg.accmap = 0;
 263   lcp->cfg.openmode = 1;
 264   lcp->cfg.lqrperiod = DEF_LQRPERIOD;
 265   lcp->cfg.fsm.timeout = DEF_FSMRETRY;
 266   lcp->cfg.fsm.maxreq = DEF_FSMTRIES;
 267   lcp->cfg.fsm.maxtrm = DEF_FSMTRIES;
 268
 269   lcp->cfg.acfcomp = NEG_ENABLED|NEG_ACCEPTED;
 270   lcp->cfg.chap05 = NEG_ACCEPTED;
 271 #ifndef NODES
 272   lcp->cfg.chap80nt = NEG_ACCEPTED;
 273   lcp->cfg.chap80lm = 0;
 274   lcp->cfg.chap81 = NEG_ACCEPTED;
 275 #endif
 276   lcp->cfg.lqr = NEG_ACCEPTED;
 277   lcp->cfg.pap = NEG_ACCEPTED;
 278   lcp->cfg.protocomp = NEG_ENABLED|NEG_ACCEPTED;
 279   *lcp->cfg.ident = '\0';
 280
 281   lcp_Setup(lcp, lcp->cfg.openmode);
 282 }
 283
 284 void
 285 lcp_Setup(struct lcp *lcp, int openmode)
 286 {
 287   struct physical *p = link2physical(lcp->fsm.link);
 288
 289   lcp->fsm.open_mode = openmode;
 290
 291   lcp->his_mru = DEF_MRU;
 292   lcp->his_mrru = 0;
 293   lcp->his_magic = 0;
 294   lcp->his_lqrperiod = 0;
 295   lcp->his_acfcomp = 0;
 296   lcp->his_auth = 0;
 297   lcp->his_authtype = 0;
 298   lcp->his_callback.opmask = 0;
 299   lcp->his_shortseq = 0;
 300   lcp->mru_req = 0;
 301
 302   if ((lcp->want_mru = lcp->cfg.mru) == 0)
 303     lcp->want_mru = DEF_MRU;
 304   lcp->want_mrru = lcp->fsm.bundle->ncp.mp.cfg.mrru;
 305   lcp->want_shortseq = IsEnabled(lcp->fsm.bundle->ncp.mp.cfg.shortseq) ? 1 : 0;
 306   lcp->want_acfcomp = IsEnabled(lcp->cfg.acfcomp) ? 1 : 0;
 307
 308   if (lcp->fsm.parent) {
 309     lcp->his_accmap = 0xffffffff;
 310     lcp->want_accmap = lcp->cfg.accmap;
 311     lcp->his_protocomp = 0;
 312     lcp->want_protocomp = IsEnabled(lcp->cfg.protocomp) ? 1 : 0;
 313     lcp->want_magic = GenerateMagic();
 314
 315     if (IsEnabled(lcp->cfg.chap05)) {
 316       lcp->want_auth = PROTO_CHAP;
 317       lcp->want_authtype = 0x05;
 318 #ifndef NODES
 319     } else if (IsEnabled(lcp->cfg.chap80nt) ||
 320                IsEnabled(lcp->cfg.chap80lm)) {
 321       lcp->want_auth = PROTO_CHAP;
 322       lcp->want_authtype = 0x80;
 323     } else if (IsEnabled(lcp->cfg.chap81)) {
 324       lcp->want_auth = PROTO_CHAP;
 325       lcp->want_authtype = 0x81;
 326 #endif
 327     } else if (IsEnabled(lcp->cfg.pap)) {
 328       lcp->want_auth = PROTO_PAP;
 329       lcp->want_authtype = 0;
 330     } else {
 331       lcp->want_auth = 0;
 332       lcp->want_authtype = 0;
 333     }
 334
 335     if (p->type != PHYS_DIRECT)
 336       memcpy(&lcp->want_callback, &p->dl->cfg.callback,
 337              sizeof(struct callback));
 338     else
 339       lcp->want_callback.opmask = 0;
 340     lcp->want_lqrperiod = IsEnabled(lcp->cfg.lqr) ?
 341                           lcp->cfg.lqrperiod * 100 : 0;
 342   } else {
 343     lcp->his_accmap = lcp->want_accmap = 0;
 344     lcp->his_protocomp = lcp->want_protocomp = 1;
 345     lcp->want_magic = 0;
 346     lcp->want_auth = 0;
 347     lcp->want_authtype = 0;
 348     lcp->want_callback.opmask = 0;
 349     lcp->want_lqrperiod = 0;
 350   }
 351
 352   lcp->his_reject = lcp->my_reject = 0;
 353   lcp->auth_iwait = lcp->auth_ineed = 0;
 354   lcp->LcpFailedMagic = 0;
 355 }
 356
 357 static void
 358 LcpInitRestartCounter(struct fsm *fp, int what)
 359 {
 360   /* Set fsm timer load */
 361   struct lcp *lcp = fsm2lcp(fp);
 362
 363   fp->FsmTimer.load = lcp->cfg.fsm.timeout * SECTICKS;
 364   switch (what) {
 365     case FSM_REQ_TIMER:
 366       fp->restart = lcp->cfg.fsm.maxreq;
 367       break;
 368     case FSM_TRM_TIMER:
 369       fp->restart = lcp->cfg.fsm.maxtrm;
 370       break;
 371     default:
 372       fp->restart = 1;
 373       break;
 374   }
 375 }
 376
 377 static void
 378 LcpSendConfigReq(struct fsm *fp)
 379 {
 380   /* Send config REQ please */
 381   struct physical *p = link2physical(fp->link);
 382   struct lcp *lcp = fsm2lcp(fp);
 383   u_char buff[200];
 384   struct fsm_opt *o;
 385   struct mp *mp;
 386   u_int16_t proto;
 387   u_short maxmru;
 388
 389   if (!p) {
 390     log_Printf(LogERROR, "%s: LcpSendConfigReq: Not a physical link !\n",
 391               fp->link->name);
 392     return;
 393   }
 394
 395   o = (struct fsm_opt *)buff;
 396   if (!physical_IsSync(p)) {
 397     if (lcp->want_acfcomp && !REJECTED(lcp, TY_ACFCOMP))
 398       INC_FSM_OPT(TY_ACFCOMP, 2, o);
 399
 400     if (lcp->want_protocomp && !REJECTED(lcp, TY_PROTOCOMP))
 401       INC_FSM_OPT(TY_PROTOCOMP, 2, o);
 402
 403     if (!REJECTED(lcp, TY_ACCMAP)) {
 404       ua_htonl(&lcp->want_accmap, o->data);
 405       INC_FSM_OPT(TY_ACCMAP, 6, o);
 406     }
 407   }
 408
 409   maxmru = p ? physical_DeviceMTU(p) : 0;
 410   if (lcp->cfg.max_mru && (!maxmru || maxmru > lcp->cfg.max_mru))
 411     maxmru = lcp->cfg.max_mru;
 412   if (maxmru && lcp->want_mru > maxmru) {
 413     log_Printf(LogWARN, "%s: Reducing configured MRU from %u to %u\n",
 414                fp->link->name, lcp->want_mru, maxmru);
 415     lcp->want_mru = maxmru;
 416   }
 417   if (!REJECTED(lcp, TY_MRU)) {
 418     ua_htons(&lcp->want_mru, o->data);
 419     INC_FSM_OPT(TY_MRU, 4, o);
 420   }
 421
 422   if (lcp->want_magic && !REJECTED(lcp, TY_MAGICNUM)) {
 423     ua_htonl(&lcp->want_magic, o->data);
 424     INC_FSM_OPT(TY_MAGICNUM, 6, o);
 425   }
 426
 427   if (lcp->want_lqrperiod && !REJECTED(lcp, TY_QUALPROTO)) {
 428     proto = PROTO_LQR;
 429     ua_htons(&proto, o->data);
 430     ua_htonl(&lcp->want_lqrperiod, o->data + 2);
 431     INC_FSM_OPT(TY_QUALPROTO, 8, o);
 432   }
 433
 434   switch (lcp->want_auth) {
 435   case PROTO_PAP:
 436     proto = PROTO_PAP;
 437     ua_htons(&proto, o->data);
 438     INC_FSM_OPT(TY_AUTHPROTO, 4, o);
 439     break;
 440
 441   case PROTO_CHAP:
 442     proto = PROTO_CHAP;
 443     ua_htons(&proto, o->data);
 444     o->data[2] = lcp->want_authtype;
 445     INC_FSM_OPT(TY_AUTHPROTO, 5, o);
 446     break;
 447   }
 448
 449   if (!REJECTED(lcp, TY_CALLBACK)) {
 450     if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) {
 451       *o->data = CALLBACK_AUTH;
 452       INC_FSM_OPT(TY_CALLBACK, 3, o);
 453     } else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_CBCP)) {
 454       *o->data = CALLBACK_CBCP;
 455       INC_FSM_OPT(TY_CALLBACK, 3, o);
 456     } else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_E164)) {
 457       int sz = strlen(lcp->want_callback.msg);
 458
 459       if (sz > sizeof o->data - 1) {
 460         sz = sizeof o->data - 1;
 461         log_Printf(LogWARN, "Truncating E164 data to %d octets (oops!)\n", sz);
 462       }
 463       *o->data = CALLBACK_E164;
 464       memcpy(o->data + 1, lcp->want_callback.msg, sz);
 465       INC_FSM_OPT(TY_CALLBACK, sz + 3, o);
 466     }
 467   }
 468
 469   if (lcp->want_mrru && !REJECTED(lcp, TY_MRRU)) {
 470     ua_htons(&lcp->want_mrru, o->data);
 471     INC_FSM_OPT(TY_MRRU, 4, o);
 472
 473     if (lcp->want_shortseq && !REJECTED(lcp, TY_SHORTSEQ))
 474       INC_FSM_OPT(TY_SHORTSEQ, 2, o);
 475   }
 476
 477   mp = &lcp->fsm.bundle->ncp.mp;
 478   if (mp->cfg.enddisc.class != 0 && IsEnabled(mp->cfg.negenddisc) &&
 479       !REJECTED(lcp, TY_ENDDISC)) {
 480     *o->data = mp->cfg.enddisc.class;
 481     memcpy(o->data+1, mp->cfg.enddisc.address, mp->cfg.enddisc.len);
 482     INC_FSM_OPT(TY_ENDDISC, mp->cfg.enddisc.len + 3, o);
 483   }
 484
 485   fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff,
 486              MB_LCPOUT);
 487 }
 488
 489 void
 490 lcp_SendProtoRej(struct lcp *lcp, u_char *option, int count)
 491 {
 492   /* Don't understand `option' */
 493   fsm_Output(&lcp->fsm, CODE_PROTOREJ, lcp->fsm.reqid, option, count,
 494              MB_LCPOUT);
 495 }
 496
 497 int
 498 lcp_SendIdentification(struct lcp *lcp)
 499 {
 500   static u_char id;             /* Use a private id */
 501   u_char msg[DEF_MRU - 3];
 502   const char *argv[2];
 503   char *exp[2];
 504
 505   if (*lcp->cfg.ident == '\0')
 506     return 0;
 507
 508   argv[0] = lcp->cfg.ident;
 509   argv[1] = NULL;
 510
 511   command_Expand(exp, 1, argv, lcp->fsm.bundle, 1, getpid());
 512
 513   ua_htonl(&lcp->want_magic, msg);
 514   strncpy(msg + 4, exp[0], sizeof msg - 5);
 515   msg[sizeof msg - 1] = '\0';
 516
 517   fsm_Output(&lcp->fsm, CODE_IDENT, id++, msg, 4 + strlen(msg + 4), MB_LCPOUT);
 518   log_Printf(LogLCP, " MAGICNUM %08x\n", lcp->want_magic);
 519   log_Printf(LogLCP, " TEXT %s\n", msg + 4);
 520
 521   command_Free(1, exp);
 522   return 1;
 523 }
 524
 525 void
 526 lcp_RecvIdentification(struct lcp *lcp, char *data)
 527 {
 528   log_Printf(LogLCP, " MAGICNUM %08x\n", lcp->his_magic);
 529   log_Printf(LogLCP, " TEXT %s\n", data);
 530 }
 531
 532 static void
 533 LcpSentTerminateReq(struct fsm *fp)
 534 {
 535   /* Term REQ just sent by FSM */
 536 }
 537
 538 static void
 539 LcpSendTerminateAck(struct fsm *fp, u_char id)
 540 {
 541   /* Send Term ACK please */
 542   struct physical *p = link2physical(fp->link);
 543
 544   if (p && p->dl->state == DATALINK_CBCP)
 545     cbcp_ReceiveTerminateReq(p);
 546
 547   fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_LCPOUT);
 548 }
 549
 550 static void
 551 LcpLayerStart(struct fsm *fp)
 552 {
 553   /* We're about to start up ! */
 554   struct lcp *lcp = fsm2lcp(fp);
 555
 556   log_Printf(LogLCP, "%s: LayerStart\n", fp->link->name);
 557   lcp->LcpFailedMagic = 0;
 558   fp->more.reqs = fp->more.naks = fp->more.rejs = lcp->cfg.fsm.maxreq * 3;
 559   lcp->mru_req = 0;
 560 }
 561
 562 static void
 563 LcpLayerFinish(struct fsm *fp)
 564 {
 565   /* We're now down */
 566   log_Printf(LogLCP, "%s: LayerFinish\n", fp->link->name);
 567 }
 568
 569 static int
 570 LcpLayerUp(struct fsm *fp)
 571 {
 572   /* We're now up */
 573   struct physical *p = link2physical(fp->link);
 574   struct lcp *lcp = fsm2lcp(fp);
 575
 576   log_Printf(LogLCP, "%s: LayerUp\n", fp->link->name);
 577   physical_SetAsyncParams(p, lcp->want_accmap, lcp->his_accmap);
 578   lqr_Start(lcp);
 579   hdlc_StartTimer(&p->hdlc);
 580   fp->more.reqs = fp->more.naks = fp->more.rejs = lcp->cfg.fsm.maxreq * 3;
 581
 582   lcp_SendIdentification(lcp);
 583
 584   return 1;
 585 }
 586
 587 static void
 588 LcpLayerDown(struct fsm *fp)
 589 {
 590   /* About to come down */
 591   struct physical *p = link2physical(fp->link);
 592
 593   log_Printf(LogLCP, "%s: LayerDown\n", fp->link->name);
 594   hdlc_StopTimer(&p->hdlc);
 595   lqr_StopTimer(p);
 596   lcp_Setup(fsm2lcp(fp), 0);
 597 }
 598
 599 static int
 600 E164ok(struct callback *cb, char *req, int sz)
 601 {
 602   char list[sizeof cb->msg], *next;
 603   int len;
 604
 605   if (!strcmp(cb->msg, "*"))
 606     return 1;
 607
 608   strncpy(list, cb->msg, sizeof list - 1);
 609   list[sizeof list - 1] = '\0';
 610   for (next = strtok(list, ","); next; next = strtok(NULL, ",")) {
 611     len = strlen(next);
 612     if (sz == len && !memcmp(list, req, sz))
 613       return 1;
 614   }
 615   return 0;
 616 }
 617
 618 static int
 619 lcp_auth_nak(struct lcp *lcp, struct fsm_decode *dec)
 620 {
 621   struct fsm_opt nak;
 622
 623   nak.hdr.id = TY_AUTHPROTO;
 624
 625   if (IsAccepted(lcp->cfg.pap)) {
 626     nak.hdr.len = 4;
 627     nak.data[0] = (unsigned char)(PROTO_PAP >> 8);
 628     nak.data[1] = (unsigned char)PROTO_PAP;
 629     fsm_nak(dec, &nak);
 630     return 1;
 631   }
 632
 633   nak.hdr.len = 5;
 634   nak.data[0] = (unsigned char)(PROTO_CHAP >> 8);
 635   nak.data[1] = (unsigned char)PROTO_CHAP;
 636
 637   if (IsAccepted(lcp->cfg.chap05)) {
 638     nak.data[2] = 0x05;
 639     fsm_nak(dec, &nak);
 640 #ifndef NODES
 641   } else if (IsAccepted(lcp->cfg.chap80nt) ||
 642              IsAccepted(lcp->cfg.chap80lm)) {
 643     nak.data[2] = 0x80;
 644     fsm_nak(dec, &nak);
 645   } else if (IsAccepted(lcp->cfg.chap81)) {
 646     nak.data[2] = 0x81;
 647     fsm_nak(dec, &nak);
 648 #endif
 649   } else {
 650     return 0;
 651   }
 652
 653   return 1;
 654 }
 655
 656 static void
 657 LcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type,
 658                 struct fsm_decode *dec)
 659 {
 660   /* Deal with incoming PROTO_LCP */
 661   struct lcp *lcp = fsm2lcp(fp);
 662   int sz, pos, op, callback_req, chap_type;
 663   u_int32_t magic, accmap;
 664   u_short mru, phmtu, maxmtu, maxmru, wantmtu, wantmru, proto;
 665   struct lqrreq *req;
 666   char request[20], desc[22];
 667   struct mp *mp;
 668   struct physical *p = link2physical(fp->link);
 669   struct fsm_opt *opt, nak;
 670
 671   sz = op = callback_req = 0;
 672
 673   while (end - cp >= sizeof(opt->hdr)) {
 674     if ((opt = fsm_readopt(&cp)) == NULL)
 675       break;
 676
 677     snprintf(request, sizeof request, " %s[%d]", protoname(opt->hdr.id),
 678              opt->hdr.len);
 679
 680     switch (opt->hdr.id) {
 681     case TY_MRRU:
 682       mp = &lcp->fsm.bundle->ncp.mp;
 683       ua_ntohs(opt->data, &mru);
 684       log_Printf(LogLCP, "%s %u\n", request, mru);
 685
 686       switch (mode_type) {
 687       case MODE_REQ:
 688         if (mp->cfg.mrru) {
 689           if (REJECTED(lcp, TY_MRRU))
 690             /* Ignore his previous reject so that we REQ next time */
 691             lcp->his_reject &= ~(1 << opt->hdr.id);
 692
 693           if (mru > MAX_MRU) {
 694             /* Push him down to MAX_MRU */
 695             lcp->his_mrru = MAX_MRU;
 696             nak.hdr.id = TY_MRRU;
 697             nak.hdr.len = 4;
 698             ua_htons(&lcp->his_mrru, nak.data);
 699             fsm_nak(dec, &nak);
 700           } else if (mru < MIN_MRU) {
 701             /* Push him up to MIN_MRU */
 702             lcp->his_mrru = MIN_MRU;
 703             nak.hdr.id = TY_MRRU;
 704             nak.hdr.len = 4;
 705             ua_htons(&lcp->his_mrru, nak.data);
 706             fsm_nak(dec, &nak);
 707           } else {
 708             lcp->his_mrru = mru;
 709             fsm_ack(dec, opt);
 710           }
 711           break;
 712         } else {
 713           fsm_rej(dec, opt);
 714           lcp->my_reject |= (1 << opt->hdr.id);
 715         }
 716         break;
 717       case MODE_NAK:
 718         if (mp->cfg.mrru) {
 719           if (REJECTED(lcp, TY_MRRU))
 720             /* Must have changed his mind ! */
 721             lcp->his_reject &= ~(1 << opt->hdr.id);
 722
 723           if (mru > MAX_MRU)
 724             lcp->want_mrru = MAX_MRU;
 725           else if (mru < MIN_MRU)
 726             lcp->want_mrru = MIN_MRU;
 727           else
 728             lcp->want_mrru = mru;
 729         }
 730         /* else we honour our config and don't send the suggested REQ */
 731         break;
 732       case MODE_REJ:
 733         lcp->his_reject |= (1 << opt->hdr.id);
 734         lcp->want_mrru = 0;             /* Ah well, no multilink :-( */
 735         break;
 736       }
 737       break;
 738
 739     case TY_MRU:
 740       lcp->mru_req = 1;
 741       ua_ntohs(opt->data, &mru);
 742       log_Printf(LogLCP, "%s %d\n", request, mru);
 743
 744       switch (mode_type) {
 745       case MODE_REQ:
 746         maxmtu = p ? physical_DeviceMTU(p) : 0;
 747         if (lcp->cfg.max_mtu && (!maxmtu || maxmtu > lcp->cfg.max_mtu))
 748           maxmtu = lcp->cfg.max_mtu;
 749         wantmtu = lcp->cfg.mtu;
 750         if (maxmtu && wantmtu > maxmtu) {
 751           log_Printf(LogWARN, "%s: Reducing configured MTU from %u to %u\n",
 752                      fp->link->name, wantmtu, maxmtu);
 753           wantmtu = maxmtu;
 754         }
 755
 756         if (maxmtu && mru > maxmtu) {
 757           lcp->his_mru = maxmtu;
 758           nak.hdr.id = TY_MRU;
 759           nak.hdr.len = 4;
 760           ua_htons(&lcp->his_mru, nak.data);
 761           fsm_nak(dec, &nak);
 762         } else if (wantmtu && mru < wantmtu) {
 763           /* Push him up to MTU or MIN_MRU */
 764           lcp->his_mru = wantmtu;
 765           nak.hdr.id = TY_MRU;
 766           nak.hdr.len = 4;
 767           ua_htons(&lcp->his_mru, nak.data);
 768           fsm_nak(dec, &nak);
 769         } else {
 770           lcp->his_mru = mru;
 771           fsm_ack(dec, opt);
 772         }
 773         break;
 774       case MODE_NAK:
 775         maxmru = p ? physical_DeviceMTU(p) : 0;
 776         if (lcp->cfg.max_mru && (!maxmru || maxmru > lcp->cfg.max_mru))
 777           maxmru = lcp->cfg.max_mru;
 778         wantmru = lcp->cfg.mru > maxmru ? maxmru : lcp->cfg.mru;
 779
 780         if (wantmru && mru > wantmru)
 781           lcp->want_mru = wantmru;
 782         else if (mru > maxmru)
 783           lcp->want_mru = maxmru;
 784         else if (mru < MIN_MRU)
 785           lcp->want_mru = MIN_MRU;
 786         else
 787           lcp->want_mru = mru;
 788         break;
 789       case MODE_REJ:
 790         lcp->his_reject |= (1 << opt->hdr.id);
 791         break;
 792       }
 793       break;
 794
 795     case TY_ACCMAP:
 796       ua_ntohl(opt->data, &accmap);
 797       log_Printf(LogLCP, "%s 0x%08lx\n", request, (u_long)accmap);
 798
 799       switch (mode_type) {
 800       case MODE_REQ:
 801         lcp->his_accmap = accmap;
 802         fsm_ack(dec, opt);
 803         break;
 804       case MODE_NAK:
 805         lcp->want_accmap = accmap;
 806         break;
 807       case MODE_REJ:
 808         lcp->his_reject |= (1 << opt->hdr.id);
 809         break;
 810       }
 811       break;
 812
 813     case TY_AUTHPROTO:
 814       ua_ntohs(opt->data, &proto);
 815       chap_type = opt->hdr.len == 5 ? opt->data[2] : 0;
 816
 817       log_Printf(LogLCP, "%s 0x%04x (%s)\n", request, proto,
 818                  Auth2Nam(proto, chap_type));
 819
 820       switch (mode_type) {
 821       case MODE_REQ:
 822         switch (proto) {
 823         case PROTO_PAP:
 824           if (opt->hdr.len == 4 && IsAccepted(lcp->cfg.pap)) {
 825             lcp->his_auth = proto;
 826             lcp->his_authtype = 0;
 827             fsm_ack(dec, opt);
 828           } else if (!lcp_auth_nak(lcp, dec)) {
 829             lcp->my_reject |= (1 << opt->hdr.id);
 830             fsm_rej(dec, opt);
 831           }
 832           break;
 833
 834         case PROTO_CHAP:
 835           if ((chap_type == 0x05 && IsAccepted(lcp->cfg.chap05))
 836 #ifndef NODES
 837               || (chap_type == 0x80 && (IsAccepted(lcp->cfg.chap80nt) ||
 838                                    (IsAccepted(lcp->cfg.chap80lm))))
 839               || (chap_type == 0x81 && IsAccepted(lcp->cfg.chap81))
 840 #endif
 841              ) {
 842             lcp->his_auth = proto;
 843             lcp->his_authtype = chap_type;
 844             fsm_ack(dec, opt);
 845           } else {
 846 #ifdef NODES
 847             if (chap_type == 0x80) {
 848               log_Printf(LogWARN, "CHAP 0x80 not available without DES\n");
 849             } else if (chap_type == 0x81) {
 850               log_Printf(LogWARN, "CHAP 0x81 not available without DES\n");
 851             } else
 852 #endif
 853             if (chap_type != 0x05)
 854               log_Printf(LogWARN, "%s not supported\n",
 855                          Auth2Nam(PROTO_CHAP, chap_type));
 856
 857             if (!lcp_auth_nak(lcp, dec)) {
 858               lcp->my_reject |= (1 << opt->hdr.id);
 859               fsm_rej(dec, opt);
 860             }
 861           }
 862           break;
 863
 864         default:
 865           log_Printf(LogLCP, "%s 0x%04x - not recognised\n",
 866                     request, proto);
 867           if (!lcp_auth_nak(lcp, dec)) {
 868             lcp->my_reject |= (1 << opt->hdr.id);
 869             fsm_rej(dec, opt);
 870           }
 871           break;
 872         }
 873         break;
 874
 875       case MODE_NAK:
 876         switch (proto) {
 877         case PROTO_PAP:
 878           if (IsEnabled(lcp->cfg.pap)) {
 879             lcp->want_auth = PROTO_PAP;
 880             lcp->want_authtype = 0;
 881           } else {
 882             log_Printf(LogLCP, "Peer will only send PAP (not enabled)\n");
 883             lcp->his_reject |= (1 << opt->hdr.id);
 884           }
 885           break;
 886         case PROTO_CHAP:
 887           if (chap_type == 0x05 && IsEnabled(lcp->cfg.chap05)) {
 888             lcp->want_auth = PROTO_CHAP;
 889             lcp->want_authtype = 0x05;
 890 #ifndef NODES
 891           } else if (chap_type == 0x80 && (IsEnabled(lcp->cfg.chap80nt) ||
 892                                            IsEnabled(lcp->cfg.chap80lm))) {
 893             lcp->want_auth = PROTO_CHAP;
 894             lcp->want_authtype = 0x80;
 895           } else if (chap_type == 0x81 && IsEnabled(lcp->cfg.chap81)) {
 896             lcp->want_auth = PROTO_CHAP;
 897             lcp->want_authtype = 0x81;
 898 #endif
 899           } else {
 900 #ifdef NODES
 901             if (chap_type == 0x80) {
 902               log_Printf(LogLCP, "Peer will only send MSCHAP (not available"
 903                          " without DES)\n");
 904             } else if (chap_type == 0x81) {
 905               log_Printf(LogLCP, "Peer will only send MSCHAPV2 (not available"
 906                          " without DES)\n");
 907             } else
 908 #endif
 909             log_Printf(LogLCP, "Peer will only send %s (not %s)\n",
 910                        Auth2Nam(PROTO_CHAP, chap_type),
 911 #ifndef NODES
 912                        (chap_type == 0x80 || chap_type == 0x81) ? "configured" :
 913 #endif
 914                        "supported");
 915             lcp->his_reject |= (1 << opt->hdr.id);
 916           }
 917           break;
 918         default:
 919           /* We've been NAK'd with something we don't understand :-( */
 920           lcp->his_reject |= (1 << opt->hdr.id);
 921           break;
 922         }
 923         break;
 924
 925       case MODE_REJ:
 926         lcp->his_reject |= (1 << opt->hdr.id);
 927         break;
 928       }
 929       break;
 930
 931     case TY_QUALPROTO:
 932       req = (struct lqrreq *)opt;
 933       log_Printf(LogLCP, "%s proto %x, interval %lums\n",
 934                 request, ntohs(req->proto), (u_long)ntohl(req->period) * 10);
 935       switch (mode_type) {
 936       case MODE_REQ:
 937         if (ntohs(req->proto) != PROTO_LQR || !IsAccepted(lcp->cfg.lqr)) {
 938           fsm_rej(dec, opt);
 939           lcp->my_reject |= (1 << opt->hdr.id);
 940         } else {
 941           lcp->his_lqrperiod = ntohl(req->period);
 942           if (lcp->his_lqrperiod < MIN_LQRPERIOD * 100)
 943             lcp->his_lqrperiod = MIN_LQRPERIOD * 100;
 944           req->period = htonl(lcp->his_lqrperiod);
 945           fsm_ack(dec, opt);
 946         }
 947         break;
 948       case MODE_NAK:
 949         lcp->want_lqrperiod = ntohl(req->period);
 950         break;
 951       case MODE_REJ:
 952         lcp->his_reject |= (1 << opt->hdr.id);
 953         break;
 954       }
 955       break;
 956
 957     case TY_MAGICNUM:
 958       ua_ntohl(opt->data, &magic);
 959       log_Printf(LogLCP, "%s 0x%08lx\n", request, (u_long)magic);
 960
 961       switch (mode_type) {
 962       case MODE_REQ:
 963         if (lcp->want_magic) {
 964           /* Validate magic number */
 965           if (magic == lcp->want_magic) {
 966             sigset_t emptyset;
 967
 968             log_Printf(LogLCP, "Magic is same (%08lx) - %d times\n",
 969                       (u_long)magic, ++lcp->LcpFailedMagic);
 970             lcp->want_magic = GenerateMagic();
 971             fsm_nak(dec, opt);
 972             ualarm(TICKUNIT * (4 + 4 * lcp->LcpFailedMagic), 0);
 973             sigemptyset(&emptyset);
 974             sigsuspend(&emptyset);
 975           } else {
 976             lcp->his_magic = magic;
 977             lcp->LcpFailedMagic = 0;
 978             fsm_ack(dec, opt);
 979           }
 980         } else {
 981           lcp->my_reject |= (1 << opt->hdr.id);
 982           fsm_rej(dec, opt);
 983         }
 984         break;
 985       case MODE_NAK:
 986         log_Printf(LogLCP, " Magic 0x%08lx is NAKed!\n", (u_long)magic);
 987         lcp->want_magic = GenerateMagic();
 988         break;
 989       case MODE_REJ:
 990         log_Printf(LogLCP, " Magic 0x%08x is REJected!\n", magic);
 991         lcp->want_magic = 0;
 992         lcp->his_reject |= (1 << opt->hdr.id);
 993         break;
 994       }
 995       break;
 996
 997     case TY_PROTOCOMP:
 998       log_Printf(LogLCP, "%s\n", request);
 999
1000       switch (mode_type) {
1001       case MODE_REQ:
1002         if (IsAccepted(lcp->cfg.protocomp)) {
1003           lcp->his_protocomp = 1;
1004           fsm_ack(dec, opt);
1005         } else {
1006 #ifdef OLDMST
1007           /* MorningStar before v1.3 needs NAK */
1008           fsm_nak(dec, opt);
1009 #else
1010           fsm_rej(dec, opt);
1011           lcp->my_reject |= (1 << opt->hdr.id);
1012 #endif
1013         }
1014         break;
1015       case MODE_NAK:
1016       case MODE_REJ:
1017         lcp->want_protocomp = 0;
1018         lcp->his_reject |= (1 << opt->hdr.id);
1019         break;
1020       }
1021       break;
1022
1023     case TY_ACFCOMP:
1024       log_Printf(LogLCP, "%s\n", request);
1025       switch (mode_type) {
1026       case MODE_REQ:
1027         if (IsAccepted(lcp->cfg.acfcomp)) {
1028           lcp->his_acfcomp = 1;
1029           fsm_ack(dec, opt);
1030         } else {
1031 #ifdef OLDMST
1032           /* MorningStar before v1.3 needs NAK */
1033           fsm_nak(dec, opt);
1034 #else
1035           fsm_rej(dec, opt);
1036           lcp->my_reject |= (1 << opt->hdr.id);
1037 #endif
1038         }
1039         break;
1040       case MODE_NAK:
1041       case MODE_REJ:
1042         lcp->want_acfcomp = 0;
1043         lcp->his_reject |= (1 << opt->hdr.id);
1044         break;
1045       }
1046       break;
1047
1048     case TY_SDP:
1049       log_Printf(LogLCP, "%s\n", request);
1050       switch (mode_type) {
1051       case MODE_REQ:
1052       case MODE_NAK:
1053       case MODE_REJ:
1054         break;
1055       }
1056       break;
1057
1058     case TY_CALLBACK:
1059       if (opt->hdr.len == 2)
1060         op = CALLBACK_NONE;
1061       else
1062         op = (int)opt->data[0];
1063       sz = opt->hdr.len - 3;
1064       switch (op) {
1065         case CALLBACK_AUTH:
1066           log_Printf(LogLCP, "%s Auth\n", request);
1067           break;
1068         case CALLBACK_DIALSTRING:
1069           log_Printf(LogLCP, "%s Dialstring %.*s\n", request, sz,
1070                      opt->data + 1);
1071           break;
1072         case CALLBACK_LOCATION:
1073           log_Printf(LogLCP, "%s Location %.*s\n", request, sz, opt->data + 1);
1074           break;
1075         case CALLBACK_E164:
1076           log_Printf(LogLCP, "%s E.164 (%.*s)\n", request, sz, opt->data + 1);
1077           break;
1078         case CALLBACK_NAME:
1079           log_Printf(LogLCP, "%s Name %.*s\n", request, sz, opt->data + 1);
1080           break;
1081         case CALLBACK_CBCP:
1082           log_Printf(LogLCP, "%s CBCP\n", request);
1083           break;
1084         default:
1085           log_Printf(LogLCP, "%s ???\n", request);
1086           break;
1087       }
1088
1089       switch (mode_type) {
1090       case MODE_REQ:
1091         callback_req = 1;
1092         if (p->type != PHYS_DIRECT) {
1093           fsm_rej(dec, opt);
1094           lcp->my_reject |= (1 << opt->hdr.id);
1095         }
1096         nak.hdr.id = opt->hdr.id;
1097         nak.hdr.len = 3;
1098         if ((p->dl->cfg.callback.opmask & CALLBACK_BIT(op)) &&
1099             (op != CALLBACK_AUTH || p->link.lcp.want_auth) &&
1100             (op != CALLBACK_E164 ||
1101              E164ok(&p->dl->cfg.callback, opt->data + 1, sz))) {
1102           lcp->his_callback.opmask = CALLBACK_BIT(op);
1103           if (sz > sizeof lcp->his_callback.msg - 1) {
1104             sz = sizeof lcp->his_callback.msg - 1;
1105             log_Printf(LogWARN, "Truncating option arg to %d octets\n", sz);
1106           }
1107           memcpy(lcp->his_callback.msg, opt->data + 1, sz);
1108           lcp->his_callback.msg[sz] = '\0';
1109           fsm_ack(dec, opt);
1110         } else if ((p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) &&
1111                     p->link.lcp.auth_ineed) {
1112           nak.data[0] = CALLBACK_AUTH;
1113           fsm_nak(dec, &nak);
1114         } else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_CBCP)) {
1115           nak.data[0] = CALLBACK_CBCP;
1116           fsm_nak(dec, &nak);
1117         } else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_E164)) {
1118           nak.data[0] = CALLBACK_E164;
1119           fsm_nak(dec, &nak);
1120         } else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) {
1121           log_Printf(LogWARN, "Cannot insist on auth callback without"
1122                      " PAP or CHAP enabled !\n");
1123           nak.data[0] = 2;
1124           fsm_nak(dec, &nak);
1125         } else {
1126           lcp->my_reject |= (1 << opt->hdr.id);
1127           fsm_rej(dec, opt);
1128         }
1129         break;
1130       case MODE_NAK:
1131         /* We don't do what he NAKs with, we do things in our preferred order */
1132         if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_AUTH))
1133           lcp->want_callback.opmask &= ~CALLBACK_BIT(CALLBACK_AUTH);
1134         else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_CBCP))
1135           lcp->want_callback.opmask &= ~CALLBACK_BIT(CALLBACK_CBCP);
1136         else if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_E164))
1137           lcp->want_callback.opmask &= ~CALLBACK_BIT(CALLBACK_E164);
1138         if (lcp->want_callback.opmask == CALLBACK_BIT(CALLBACK_NONE)) {
1139           log_Printf(LogPHASE, "Peer NAKd all callbacks, trying none\n");
1140           lcp->want_callback.opmask = 0;
1141         } else if (!lcp->want_callback.opmask) {
1142           log_Printf(LogPHASE, "Peer NAKd last configured callback\n");
1143           fsm_Close(&lcp->fsm);
1144         }
1145         break;
1146       case MODE_REJ:
1147         if (lcp->want_callback.opmask & CALLBACK_BIT(CALLBACK_NONE)) {
1148           lcp->his_reject |= (1 << opt->hdr.id);
1149           lcp->want_callback.opmask = 0;
1150         } else {
1151           log_Printf(LogPHASE, "Peer rejected *required* callback\n");
1152           fsm_Close(&lcp->fsm);
1153         }
1154         break;
1155       }
1156       break;
1157
1158     case TY_SHORTSEQ:
1159       mp = &lcp->fsm.bundle->ncp.mp;
1160       log_Printf(LogLCP, "%s\n", request);
1161
1162       switch (mode_type) {
1163       case MODE_REQ:
1164         if (lcp->want_mrru && IsAccepted(mp->cfg.shortseq)) {
1165           lcp->his_shortseq = 1;
1166           fsm_ack(dec, opt);
1167         } else {
1168           fsm_rej(dec, opt);
1169           lcp->my_reject |= (1 << opt->hdr.id);
1170         }
1171         break;
1172       case MODE_NAK:
1173         /*
1174          * He's trying to get us to ask for short sequence numbers.
1175          * We ignore the NAK and honour our configuration file instead.
1176          */
1177         break;
1178       case MODE_REJ:
1179         lcp->his_reject |= (1 << opt->hdr.id);
1180         lcp->want_shortseq = 0;         /* For when we hit MP */
1181         break;
1182       }
1183       break;
1184
1185     case TY_ENDDISC:
1186       mp = &lcp->fsm.bundle->ncp.mp;
1187       log_Printf(LogLCP, "%s %s\n", request,
1188                  mp_Enddisc(opt->data[0], opt->data + 1, opt->hdr.len - 3));
1189       switch (mode_type) {
1190       case MODE_REQ:
1191         if (!p) {
1192           log_Printf(LogLCP, " ENDDISC rejected - not a physical link\n");
1193           fsm_rej(dec, opt);
1194           lcp->my_reject |= (1 << opt->hdr.id);
1195         } else if (!IsAccepted(mp->cfg.negenddisc)) {
1196           lcp->my_reject |= (1 << opt->hdr.id);
1197           fsm_rej(dec, opt);
1198         } else if (opt->hdr.len - 3 < sizeof p->dl->peer.enddisc.address &&
1199                    opt->data[0] <= MAX_ENDDISC_CLASS) {
1200           p->dl->peer.enddisc.class = opt->data[0];
1201           p->dl->peer.enddisc.len = opt->hdr.len - 3;
1202           memcpy(p->dl->peer.enddisc.address, opt->data + 1, opt->hdr.len - 3);
1203           p->dl->peer.enddisc.address[opt->hdr.len - 3] = '\0';
1204           /* XXX: If mp->active, compare and NAK with mp->peer ? */
1205           fsm_ack(dec, opt);
1206         } else {
1207           if (opt->data[0] > MAX_ENDDISC_CLASS)
1208             log_Printf(LogLCP, " ENDDISC rejected - unrecognised class %d\n",
1209                       opt->data[0]);
1210           else
1211             log_Printf(LogLCP, " ENDDISC rejected - local max length is %ld\n",
1212                       (long)(sizeof p->dl->peer.enddisc.address - 1));
1213           fsm_rej(dec, opt);
1214           lcp->my_reject |= (1 << opt->hdr.id);
1215         }
1216         break;
1217
1218       case MODE_NAK:    /* Treat this as a REJ, we don't vary our disc (yet) */
1219       case MODE_REJ:
1220         lcp->his_reject |= (1 << opt->hdr.id);
1221         break;
1222       }
1223       break;
1224
1225     default:
1226       sz = (sizeof desc - 2) / 2;
1227       if (sz > opt->hdr.len - 2)
1228         sz = opt->hdr.len - 2;
1229       pos = 0;
1230       desc[0] = sz ? ' ' : '\0';
1231       for (pos = 0; sz--; pos++)
1232         sprintf(desc+(pos<<1)+1, "%02x", opt->data[pos]);
1233
1234       log_Printf(LogLCP, "%s%s\n", request, desc);
1235
1236       if (mode_type == MODE_REQ) {
1237         fsm_rej(dec, opt);
1238         lcp->my_reject |= (1 << opt->hdr.id);
1239       }
1240       break;
1241     }
1242   }
1243
1244   if (mode_type != MODE_NOP) {
1245     if (mode_type == MODE_REQ && p && p->type == PHYS_DIRECT &&
1246         p->dl->cfg.callback.opmask && !callback_req &&
1247         !(p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_NONE))) {
1248       /* We *REQUIRE* that the peer requests callback */
1249       nak.hdr.id = TY_CALLBACK;
1250       nak.hdr.len = 3;
1251       if ((p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_AUTH)) &&
1252           p->link.lcp.want_auth)
1253         nak.data[0] = CALLBACK_AUTH;
1254       else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_CBCP))
1255         nak.data[0] = CALLBACK_CBCP;
1256       else if (p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_E164))
1257         nak.data[0] = CALLBACK_E164;
1258       else {
1259         log_Printf(LogWARN, "Cannot insist on auth callback without"
1260                    " PAP or CHAP enabled !\n");
1261         nak.hdr.len = 2;        /* XXX: Silly ! */
1262       }
1263       fsm_nak(dec, &nak);
1264     }
1265     if (mode_type == MODE_REQ && !lcp->mru_req) {
1266       mru = DEF_MRU;
1267       phmtu = p ? physical_DeviceMTU(p) : 0;
1268       if (phmtu && mru > phmtu)
1269         mru = phmtu;
1270       if (mru > lcp->cfg.max_mtu)
1271         mru = lcp->cfg.max_mtu;
1272       if (mru < DEF_MRU) {
1273         /* Don't let the peer use the default MRU */
1274         lcp->his_mru = lcp->cfg.mtu && lcp->cfg.mtu < mru ? lcp->cfg.mtu : mru;
1275         nak.hdr.id = TY_MRU;
1276         nak.hdr.len = 4;
1277         ua_htons(&lcp->his_mru, nak.data);
1278         fsm_nak(dec, &nak);
1279         lcp->mru_req = 1;       /* Don't keep NAK'ing this */
1280       }
1281     }
1282     fsm_opt_normalise(dec);
1283   }
1284 }
1285
1286 extern struct mbuf *
1287 lcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
1288 {
1289   /* Got PROTO_LCP from link */
1290   m_settype(bp, MB_LCPIN);
1291   fsm_Input(&l->lcp.fsm, bp);
1292   return NULL;
1293 }