usr.sbin/ppp/ipcp.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  * $FreeBSD$
  29  */
  30
  31 #include <sys/param.h>
  32 #include <netinet/in_systm.h>
  33 #include <netinet/in.h>
  34 #include <netinet/ip.h>
  35 #include <arpa/inet.h>
  36 #include <sys/socket.h>
  37 #include <net/if.h>
  38 #include <net/route.h>
  39 #include <netdb.h>
  40 #include <sys/un.h>
  41
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <resolv.h>
  45 #include <stdarg.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <sys/stat.h>
  49 #include <termios.h>
  50 #include <unistd.h>
  51
  52 #ifndef NONAT
  53 #ifdef LOCALNAT
  54 #include "alias.h"
  55 #else
  56 #include <alias.h>
  57 #endif
  58 #endif
  59
  60 #include "layer.h"
  61 #include "ua.h"
  62 #include "defs.h"
  63 #include "command.h"
  64 #include "mbuf.h"
  65 #include "log.h"
  66 #include "timer.h"
  67 #include "fsm.h"
  68 #include "proto.h"
  69 #include "iplist.h"
  70 #include "throughput.h"
  71 #include "slcompress.h"
  72 #include "lqr.h"
  73 #include "hdlc.h"
  74 #include "lcp.h"
  75 #include "ncpaddr.h"
  76 #include "ip.h"
  77 #include "ipcp.h"
  78 #include "filter.h"
  79 #include "descriptor.h"
  80 #include "vjcomp.h"
  81 #include "async.h"
  82 #include "ccp.h"
  83 #include "link.h"
  84 #include "physical.h"
  85 #include "mp.h"
  86 #ifndef NORADIUS
  87 #include "radius.h"
  88 #endif
  89 #include "ipv6cp.h"
  90 #include "ncp.h"
  91 #include "bundle.h"
  92 #include "id.h"
  93 #include "arp.h"
  94 #include "systems.h"
  95 #include "prompt.h"
  96 #include "route.h"
  97 #include "iface.h"
  98
  99 #undef REJECTED
 100 #define REJECTED(p, x)  ((p)->peer_reject & (1<<(x)))
 101 #define issep(ch) ((ch) == ' ' || (ch) == '\t')
 102 #define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.')
 103
 104 struct compreq {
 105   u_short proto;
 106   u_char slots;
 107   u_char compcid;
 108 };
 109
 110 static int IpcpLayerUp(struct fsm *);
 111 static void IpcpLayerDown(struct fsm *);
 112 static void IpcpLayerStart(struct fsm *);
 113 static void IpcpLayerFinish(struct fsm *);
 114 static void IpcpInitRestartCounter(struct fsm *, int);
 115 static void IpcpSendConfigReq(struct fsm *);
 116 static void IpcpSentTerminateReq(struct fsm *);
 117 static void IpcpSendTerminateAck(struct fsm *, u_char);
 118 static void IpcpDecodeConfig(struct fsm *, u_char *, u_char *, int,
 119                              struct fsm_decode *);
 120
 121 extern struct libalias *la;
 122
 123 static struct fsm_callbacks ipcp_Callbacks = {
 124   IpcpLayerUp,
 125   IpcpLayerDown,
 126   IpcpLayerStart,
 127   IpcpLayerFinish,
 128   IpcpInitRestartCounter,
 129   IpcpSendConfigReq,
 130   IpcpSentTerminateReq,
 131   IpcpSendTerminateAck,
 132   IpcpDecodeConfig,
 133   fsm_NullRecvResetReq,
 134   fsm_NullRecvResetAck
 135 };
 136
 137 static const char *
 138 protoname(int proto)
 139 {
 140   static struct {
 141     int id;
 142     const char *txt;
 143   } cftypes[] = {
 144     /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */
 145     { 1, "IPADDRS" },           /* IP-Addresses */      /* deprecated */
 146     { 2, "COMPPROTO" },         /* IP-Compression-Protocol */
 147     { 3, "IPADDR" },            /* IP-Address */
 148     { 129, "PRIDNS" },          /* 129: Primary DNS Server Address */
 149     { 130, "PRINBNS" },         /* 130: Primary NBNS Server Address */
 150     { 131, "SECDNS" },          /* 131: Secondary DNS Server Address */
 151     { 132, "SECNBNS" }          /* 132: Secondary NBNS Server Address */
 152   };
 153   unsigned f;
 154
 155   for (f = 0; f < sizeof cftypes / sizeof *cftypes; f++)
 156     if (cftypes[f].id == proto)
 157       return cftypes[f].txt;
 158
 159   return NumStr(proto, NULL, 0);
 160 }
 161
 162 void
 163 ipcp_AddInOctets(struct ipcp *ipcp, int n)
 164 {
 165   throughput_addin(&ipcp->throughput, n);
 166 }
 167
 168 void
 169 ipcp_AddOutOctets(struct ipcp *ipcp, int n)
 170 {
 171   throughput_addout(&ipcp->throughput, n);
 172 }
 173
 174 void
 175 ipcp_LoadDNS(struct ipcp *ipcp)
 176 {
 177   int fd;
 178
 179   ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr = INADDR_NONE;
 180
 181   if (ipcp->ns.resolv != NULL) {
 182     free(ipcp->ns.resolv);
 183     ipcp->ns.resolv = NULL;
 184   }
 185   if (ipcp->ns.resolv_nons != NULL) {
 186     free(ipcp->ns.resolv_nons);
 187     ipcp->ns.resolv_nons = NULL;
 188   }
 189   ipcp->ns.resolver = 0;
 190
 191   if ((fd = open(_PATH_RESCONF, O_RDONLY)) != -1) {
 192     struct stat st;
 193
 194     if (fstat(fd, &st) == 0) {
 195       ssize_t got;
 196
 197       /*
 198        * Note, ns.resolv and ns.resolv_nons are assumed to always point to
 199        * buffers of the same size!  See the strcpy() below.
 200        */
 201       if ((ipcp->ns.resolv_nons = (char *)malloc(st.st_size + 1)) == NULL)
 202         log_Printf(LogERROR, "Failed to malloc %lu for %s: %s\n",
 203                    (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno));
 204       else if ((ipcp->ns.resolv = (char *)malloc(st.st_size + 1)) == NULL) {
 205         log_Printf(LogERROR, "Failed(2) to malloc %lu for %s: %s\n",
 206                    (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno));
 207         free(ipcp->ns.resolv_nons);
 208         ipcp->ns.resolv_nons = NULL;
 209       } else if ((got = read(fd, ipcp->ns.resolv, st.st_size)) != st.st_size) {
 210         if (got == -1)
 211           log_Printf(LogERROR, "Failed to read %s: %s\n",
 212                      _PATH_RESCONF, strerror(errno));
 213         else
 214           log_Printf(LogERROR, "Failed to read %s, got %lu not %lu\n",
 215                      _PATH_RESCONF, (unsigned long)got,
 216                      (unsigned long)st.st_size);
 217         free(ipcp->ns.resolv_nons);
 218         ipcp->ns.resolv_nons = NULL;
 219         free(ipcp->ns.resolv);
 220         ipcp->ns.resolv = NULL;
 221       } else {
 222         char *cp, *cp_nons, *ncp, ch;
 223         int n;
 224
 225         ipcp->ns.resolv[st.st_size] = '\0';
 226         ipcp->ns.resolver = 1;
 227
 228         cp_nons = ipcp->ns.resolv_nons;
 229         cp = ipcp->ns.resolv;
 230         n = 0;
 231
 232         while ((ncp = strstr(cp, "nameserver")) != NULL) {
 233           if (ncp != cp) {
 234             memcpy(cp_nons, cp, ncp - cp);
 235             cp_nons += ncp - cp;
 236           }
 237           if ((ncp != cp && ncp[-1] != '\n') || !issep(ncp[10])) {
 238             memcpy(cp_nons, ncp, 9);
 239             cp_nons += 9;
 240             cp = ncp + 9;       /* Can't match "nameserver" at cp... */
 241             continue;
 242           }
 243
 244           for (cp = ncp + 11; issep(*cp); cp++) /* Skip whitespace */
 245             ;
 246
 247           for (ncp = cp; isip(*ncp); ncp++)             /* Jump over IP */
 248             ;
 249
 250           ch = *ncp;
 251           *ncp = '\0';
 252           if (n < 2 && inet_aton(cp, ipcp->ns.dns))
 253             n++;
 254           *ncp = ch;
 255
 256           if ((cp = strchr(ncp, '\n')) == NULL) /* Point at next line */
 257             cp = ncp + strlen(ncp);
 258           else
 259             cp++;
 260         }
 261         /*
 262          * Note, cp_nons and cp always point to buffers of the same size, so
 263          * strcpy is ok!
 264          */
 265         strcpy(cp_nons, cp);    /* Copy the end - including the NUL */
 266         cp_nons += strlen(cp_nons) - 1;
 267         while (cp_nons >= ipcp->ns.resolv_nons && *cp_nons == '\n')
 268           *cp_nons-- = '\0';
 269         if (n == 2 && ipcp->ns.dns[0].s_addr == INADDR_ANY) {
 270           ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr;
 271           ipcp->ns.dns[1].s_addr = INADDR_ANY;
 272         }
 273         bundle_AdjustDNS(ipcp->fsm.bundle);
 274       }
 275     } else
 276       log_Printf(LogERROR, "Failed to stat opened %s: %s\n",
 277                  _PATH_RESCONF, strerror(errno));
 278
 279     close(fd);
 280   }
 281 }
 282
 283 int
 284 ipcp_WriteDNS(struct ipcp *ipcp)
 285 {
 286   const char *paddr;
 287   mode_t mask;
 288   FILE *fp;
 289
 290   if (ipcp->ns.dns[0].s_addr == INADDR_ANY &&
 291       ipcp->ns.dns[1].s_addr == INADDR_ANY) {
 292     log_Printf(LogIPCP, "%s not modified: All nameservers NAKd\n",
 293               _PATH_RESCONF);
 294     return 0;
 295   }
 296
 297   if (ipcp->ns.dns[0].s_addr == INADDR_ANY) {
 298     ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr;
 299     ipcp->ns.dns[1].s_addr = INADDR_ANY;
 300   }
 301
 302   mask = umask(022);
 303   if ((fp = ID0fopen(_PATH_RESCONF, "w")) != NULL) {
 304     umask(mask);
 305     if (ipcp->ns.resolv_nons)
 306       fputs(ipcp->ns.resolv_nons, fp);
 307     paddr = inet_ntoa(ipcp->ns.dns[0]);
 308     log_Printf(LogIPCP, "Primary nameserver set to %s\n", paddr);
 309     fprintf(fp, "\nnameserver %s\n", paddr);
 310     if (ipcp->ns.dns[1].s_addr != INADDR_ANY &&
 311         ipcp->ns.dns[1].s_addr != INADDR_NONE &&
 312         ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) {
 313       paddr = inet_ntoa(ipcp->ns.dns[1]);
 314       log_Printf(LogIPCP, "Secondary nameserver set to %s\n", paddr);
 315       fprintf(fp, "nameserver %s\n", paddr);
 316     }
 317     if (fclose(fp) == EOF) {
 318       log_Printf(LogERROR, "write(): Failed updating %s: %s\n", _PATH_RESCONF,
 319                  strerror(errno));
 320       return 0;
 321     }
 322   } else
 323     umask(mask);
 324
 325   return 1;
 326 }
 327
 328 void
 329 ipcp_RestoreDNS(struct ipcp *ipcp)
 330 {
 331   if (ipcp->ns.resolver) {
 332     ssize_t got, len;
 333     int fd;
 334
 335     if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_TRUNC, 0644)) != -1) {
 336       len = strlen(ipcp->ns.resolv);
 337       if ((got = write(fd, ipcp->ns.resolv, len)) != len) {
 338         if (got == -1)
 339           log_Printf(LogERROR, "Failed rewriting %s: write: %s\n",
 340                      _PATH_RESCONF, strerror(errno));
 341         else
 342           log_Printf(LogERROR, "Failed rewriting %s: wrote %ld of %ld\n",
 343                      _PATH_RESCONF, (long)got, (long)len);
 344       }
 345       close(fd);
 346     } else
 347       log_Printf(LogERROR, "Failed rewriting %s: open: %s\n", _PATH_RESCONF,
 348                  strerror(errno));
 349   } else if (remove(_PATH_RESCONF) == -1)
 350     log_Printf(LogERROR, "Failed removing %s: %s\n", _PATH_RESCONF,
 351                strerror(errno));
 352
 353 }
 354
 355 int
 356 ipcp_Show(struct cmdargs const *arg)
 357 {
 358   struct ipcp *ipcp = &arg->bundle->ncp.ipcp;
 359
 360   prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name,
 361                 State2Nam(ipcp->fsm.state));
 362   if (ipcp->fsm.state == ST_OPENED) {
 363     prompt_Printf(arg->prompt, " His side:        %s, %s\n",
 364                   inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto));
 365     prompt_Printf(arg->prompt, " My side:         %s, %s\n",
 366                   inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto));
 367     prompt_Printf(arg->prompt, " Queued packets:  %lu\n",
 368                   (unsigned long)ipcp_QueueLen(ipcp));
 369   }
 370
 371   prompt_Printf(arg->prompt, "\nDefaults:\n");
 372   prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config"
 373                 " REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout,
 374                 ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s",
 375                 ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s");
 376   prompt_Printf(arg->prompt, " My Address:      %s\n",
 377                 ncprange_ntoa(&ipcp->cfg.my_range));
 378   if (ipcp->cfg.HaveTriggerAddress)
 379     prompt_Printf(arg->prompt, " Trigger address: %s\n",
 380                   inet_ntoa(ipcp->cfg.TriggerAddress));
 381
 382   prompt_Printf(arg->prompt, " VJ compression:  %s (%d slots %s slot "
 383                 "compression)\n", command_ShowNegval(ipcp->cfg.vj.neg),
 384                 ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without");
 385
 386   if (iplist_isvalid(&ipcp->cfg.peer_list))
 387     prompt_Printf(arg->prompt, " His Address:     %s\n",
 388                   ipcp->cfg.peer_list.src);
 389   else
 390     prompt_Printf(arg->prompt, " His Address:     %s\n",
 391                   ncprange_ntoa(&ipcp->cfg.peer_range));
 392
 393   prompt_Printf(arg->prompt, " DNS:             %s",
 394                 ipcp->cfg.ns.dns[0].s_addr == INADDR_NONE ?
 395                 "none" : inet_ntoa(ipcp->cfg.ns.dns[0]));
 396   if (ipcp->cfg.ns.dns[1].s_addr != INADDR_NONE)
 397     prompt_Printf(arg->prompt, ", %s",
 398                   inet_ntoa(ipcp->cfg.ns.dns[1]));
 399   prompt_Printf(arg->prompt, ", %s\n",
 400                 command_ShowNegval(ipcp->cfg.ns.dns_neg));
 401   prompt_Printf(arg->prompt, " Resolver DNS:    %s",
 402                 ipcp->ns.dns[0].s_addr == INADDR_NONE ?
 403                 "none" : inet_ntoa(ipcp->ns.dns[0]));
 404   if (ipcp->ns.dns[1].s_addr != INADDR_NONE &&
 405       ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr)
 406     prompt_Printf(arg->prompt, ", %s",
 407                   inet_ntoa(ipcp->ns.dns[1]));
 408   prompt_Printf(arg->prompt, "\n NetBIOS NS:      %s, ",
 409                 inet_ntoa(ipcp->cfg.ns.nbns[0]));
 410   prompt_Printf(arg->prompt, "%s\n\n",
 411                 inet_ntoa(ipcp->cfg.ns.nbns[1]));
 412
 413   throughput_disp(&ipcp->throughput, arg->prompt);
 414
 415   return 0;
 416 }
 417
 418 int
 419 ipcp_vjset(struct cmdargs const *arg)
 420 {
 421   if (arg->argc != arg->argn+2)
 422     return -1;
 423   if (!strcasecmp(arg->argv[arg->argn], "slots")) {
 424     int slots;
 425
 426     slots = atoi(arg->argv[arg->argn+1]);
 427     if (slots < 4 || slots > 16)
 428       return 1;
 429     arg->bundle->ncp.ipcp.cfg.vj.slots = slots;
 430     return 0;
 431   } else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) {
 432     if (!strcasecmp(arg->argv[arg->argn+1], "on"))
 433       arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1;
 434     else if (!strcasecmp(arg->argv[arg->argn+1], "off"))
 435       arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0;
 436     else
 437       return 2;
 438     return 0;
 439   }
 440   return -1;
 441 }
 442
 443 void
 444 ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l,
 445           const struct fsm_parent *parent)
 446 {
 447   struct hostent *hp;
 448   struct in_addr host;
 449   char name[MAXHOSTNAMELEN];
 450   static const char * const timer_names[] =
 451     {"IPCP restart", "IPCP openmode", "IPCP stopped"};
 452
 453   fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP,
 454            bundle, l, parent, &ipcp_Callbacks, timer_names);
 455
 456   ipcp->cfg.vj.slots = DEF_VJ_STATES;
 457   ipcp->cfg.vj.slotcomp = 1;
 458   memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range);
 459
 460   host.s_addr = htonl(INADDR_LOOPBACK);
 461   ipcp->cfg.netmask.s_addr = INADDR_ANY;
 462   if (gethostname(name, sizeof name) == 0) {
 463     hp = gethostbyname(name);
 464     if (hp && hp->h_addrtype == AF_INET && hp->h_length == sizeof host.s_addr)
 465       memcpy(&host.s_addr, hp->h_addr, sizeof host.s_addr);
 466   }
 467   ncprange_setip4(&ipcp->cfg.my_range, host, ipcp->cfg.netmask);
 468   ncprange_setip4(&ipcp->cfg.peer_range, ipcp->cfg.netmask, ipcp->cfg.netmask);
 469
 470   iplist_setsrc(&ipcp->cfg.peer_list, "");
 471   ipcp->cfg.HaveTriggerAddress = 0;
 472
 473   ipcp->cfg.ns.dns[0].s_addr = INADDR_NONE;
 474   ipcp->cfg.ns.dns[1].s_addr = INADDR_NONE;
 475   ipcp->cfg.ns.dns_neg = 0;
 476   ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY;
 477   ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY;
 478
 479   ipcp->cfg.fsm.timeout = DEF_FSMRETRY;
 480   ipcp->cfg.fsm.maxreq = DEF_FSMTRIES;
 481   ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES;
 482   ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED;
 483
 484   memset(&ipcp->vj, '\0', sizeof ipcp->vj);
 485
 486   ipcp->ns.resolv = NULL;
 487   ipcp->ns.resolv_nons = NULL;
 488   ipcp->ns.writable = 1;
 489   ipcp_LoadDNS(ipcp);
 490
 491   throughput_init(&ipcp->throughput, SAMPLE_PERIOD);
 492   memset(ipcp->Queue, '\0', sizeof ipcp->Queue);
 493   ipcp_Setup(ipcp, INADDR_NONE);
 494 }
 495
 496 void
 497 ipcp_Destroy(struct ipcp *ipcp)
 498 {
 499   throughput_destroy(&ipcp->throughput);
 500
 501   if (ipcp->ns.resolv != NULL) {
 502     free(ipcp->ns.resolv);
 503     ipcp->ns.resolv = NULL;
 504   }
 505   if (ipcp->ns.resolv_nons != NULL) {
 506     free(ipcp->ns.resolv_nons);
 507     ipcp->ns.resolv_nons = NULL;
 508   }
 509 }
 510
 511 void
 512 ipcp_SetLink(struct ipcp *ipcp, struct link *l)
 513 {
 514   ipcp->fsm.link = l;
 515 }
 516
 517 void
 518 ipcp_Setup(struct ipcp *ipcp, u_int32_t mask)
 519 {
 520   struct iface *iface = ipcp->fsm.bundle->iface;
 521   struct ncpaddr ipaddr;
 522   struct in_addr peer;
 523   int pos;
 524   unsigned n;
 525
 526   ipcp->fsm.open_mode = 0;
 527   ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask;
 528
 529   if (iplist_isvalid(&ipcp->cfg.peer_list)) {
 530     /* Try to give the peer a previously configured IP address */
 531     for (n = 0; n < iface->addrs; n++) {
 532       if (!ncpaddr_getip4(&iface->addr[n].peer, &peer))
 533         continue;
 534       if ((pos = iplist_ip2pos(&ipcp->cfg.peer_list, peer)) != -1) {
 535         ncpaddr_setip4(&ipaddr, iplist_setcurpos(&ipcp->cfg.peer_list, pos));
 536         break;
 537       }
 538     }
 539     if (n == iface->addrs)
 540       /* Ok, so none of 'em fit.... pick a random one */
 541       ncpaddr_setip4(&ipaddr, iplist_setrandpos(&ipcp->cfg.peer_list));
 542
 543     ncprange_sethost(&ipcp->cfg.peer_range, &ipaddr);
 544   }
 545
 546   ipcp->heis1172 = 0;
 547   ipcp->peer_req = 0;
 548   ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip);
 549   ipcp->peer_compproto = 0;
 550
 551   if (ipcp->cfg.HaveTriggerAddress) {
 552     /*
 553      * Some implementations of PPP require that we send a
 554      * *special* value as our address, even though the rfc specifies
 555      * full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0").
 556      */
 557     ipcp->my_ip = ipcp->cfg.TriggerAddress;
 558     log_Printf(LogIPCP, "Using trigger address %s\n",
 559               inet_ntoa(ipcp->cfg.TriggerAddress));
 560   } else {
 561     /*
 562      * Otherwise, if we've used an IP number before and it's still within
 563      * the network specified on the ``set ifaddr'' line, we really
 564      * want to keep that IP number so that we can keep any existing
 565      * connections that are bound to that IP.
 566      */
 567     for (n = 0; n < iface->addrs; n++) {
 568       ncprange_getaddr(&iface->addr[n].ifa, &ipaddr);
 569       if (ncprange_contains(&ipcp->cfg.my_range, &ipaddr)) {
 570         ncpaddr_getip4(&ipaddr, &ipcp->my_ip);
 571         break;
 572       }
 573     }
 574     if (n == iface->addrs)
 575       ncprange_getip4addr(&ipcp->cfg.my_range, &ipcp->my_ip);
 576   }
 577
 578   if (IsEnabled(ipcp->cfg.vj.neg)
 579 #ifndef NORADIUS
 580       || (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj)
 581 #endif
 582      )
 583     ipcp->my_compproto = (PROTO_VJCOMP << 16) +
 584                          ((ipcp->cfg.vj.slots - 1) << 8) +
 585                          ipcp->cfg.vj.slotcomp;
 586   else
 587     ipcp->my_compproto = 0;
 588   sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1);
 589
 590   ipcp->peer_reject = 0;
 591   ipcp->my_reject = 0;
 592
 593   /* Copy startup values into ipcp->ns.dns */
 594   if (ipcp->cfg.ns.dns[0].s_addr != INADDR_NONE)
 595     memcpy(ipcp->ns.dns, ipcp->cfg.ns.dns, sizeof ipcp->ns.dns);
 596 }
 597
 598 static int
 599 numaddresses(struct in_addr mask)
 600 {
 601   u_int32_t bit, haddr;
 602   int n;
 603
 604   haddr = ntohl(mask.s_addr);
 605   bit = 1;
 606   n = 1;
 607
 608   do {
 609     if (!(haddr & bit))
 610       n <<= 1;
 611   } while (bit <<= 1);
 612
 613   return n;
 614 }
 615
 616 static int
 617 ipcp_proxyarp(struct ipcp *ipcp,
 618               int (*proxyfun)(struct bundle *, struct in_addr),
 619               const struct iface_addr *addr)
 620 {
 621   struct bundle *bundle = ipcp->fsm.bundle;
 622   struct in_addr peer, mask, ip;
 623   int n, ret;
 624
 625   if (!ncpaddr_getip4(&addr->peer, &peer)) {
 626     log_Printf(LogERROR, "Oops, ipcp_proxyarp() called with unexpected addr\n");
 627     return 0;
 628   }
 629
 630   ret = 0;
 631
 632   if (Enabled(bundle, OPT_PROXYALL)) {
 633     ncprange_getip4mask(&addr->ifa, &mask);
 634     if ((n = numaddresses(mask)) > 256) {
 635       log_Printf(LogWARN, "%s: Too many addresses for proxyall\n",
 636                  ncprange_ntoa(&addr->ifa));
 637       return 0;
 638     }
 639     ip.s_addr = peer.s_addr & mask.s_addr;
 640     if (n >= 4) {
 641       ip.s_addr = htonl(ntohl(ip.s_addr) + 1);
 642       n -= 2;
 643     }
 644     while (n) {
 645       if (!((ip.s_addr ^ peer.s_addr) & mask.s_addr)) {
 646         if (!(ret = (*proxyfun)(bundle, ip)))
 647           break;
 648         n--;
 649       }
 650       ip.s_addr = htonl(ntohl(ip.s_addr) + 1);
 651     }
 652     ret = !n;
 653   } else if (Enabled(bundle, OPT_PROXY))
 654     ret = (*proxyfun)(bundle, peer);
 655
 656   return ret;
 657 }
 658
 659 static int
 660 ipcp_SetIPaddress(struct ipcp *ipcp, struct in_addr myaddr,
 661                   struct in_addr hisaddr)
 662 {
 663   struct bundle *bundle = ipcp->fsm.bundle;
 664   struct ncpaddr myncpaddr, hisncpaddr;
 665   struct ncprange myrange;
 666   struct in_addr mask;
 667   struct sockaddr_storage ssdst, ssgw, ssmask;
 668   struct sockaddr *sadst, *sagw, *samask;
 669
 670   sadst = (struct sockaddr *)&ssdst;
 671   sagw = (struct sockaddr *)&ssgw;
 672   samask = (struct sockaddr *)&ssmask;
 673
 674   ncpaddr_setip4(&hisncpaddr, hisaddr);
 675   ncpaddr_setip4(&myncpaddr, myaddr);
 676   ncprange_sethost(&myrange, &myncpaddr);
 677
 678   mask = addr2mask(myaddr);
 679
 680   if (ipcp->ifmask.s_addr != INADDR_ANY &&
 681       (ipcp->ifmask.s_addr & mask.s_addr) == mask.s_addr)
 682     ncprange_setip4mask(&myrange, ipcp->ifmask);
 683
 684   if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &hisncpaddr,
 685                  IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM))
 686     return 0;
 687
 688   if (!Enabled(bundle, OPT_IFACEALIAS))
 689     iface_Clear(bundle->iface, &bundle->ncp, AF_INET,
 690                 IFACE_CLEAR_ALIASES|IFACE_SYSTEM);
 691
 692   if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) {
 693     ncprange_getsa(&myrange, &ssgw, &ssmask);
 694     ncpaddr_getsa(&hisncpaddr, &ssdst);
 695     rt_Update(bundle, sadst, sagw, samask);
 696   }
 697
 698   if (Enabled(bundle, OPT_SROUTES))
 699     route_Change(bundle, bundle->ncp.route, &myncpaddr, &hisncpaddr);
 700
 701 #ifndef NORADIUS
 702   if (bundle->radius.valid)
 703     route_Change(bundle, bundle->radius.routes, &myncpaddr, &hisncpaddr);
 704 #endif
 705
 706   return 1;     /* Ok */
 707 }
 708
 709 static struct in_addr
 710 ChooseHisAddr(struct bundle *bundle, struct in_addr gw)
 711 {
 712   struct in_addr try;
 713   u_long f;
 714
 715   for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) {
 716     try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list);
 717     log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n",
 718               f, inet_ntoa(try));
 719     if (ipcp_SetIPaddress(&bundle->ncp.ipcp, gw, try)) {
 720       log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try));
 721       break;
 722     }
 723   }
 724
 725   if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) {
 726     log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n");
 727     try.s_addr = INADDR_ANY;
 728   }
 729
 730   return try;
 731 }
 732
 733 static void
 734 IpcpInitRestartCounter(struct fsm *fp, int what)
 735 {
 736   /* Set fsm timer load */
 737   struct ipcp *ipcp = fsm2ipcp(fp);
 738
 739   fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS;
 740   switch (what) {
 741     case FSM_REQ_TIMER:
 742       fp->restart = ipcp->cfg.fsm.maxreq;
 743       break;
 744     case FSM_TRM_TIMER:
 745       fp->restart = ipcp->cfg.fsm.maxtrm;
 746       break;
 747     default:
 748       fp->restart = 1;
 749       break;
 750   }
 751 }
 752
 753 static void
 754 IpcpSendConfigReq(struct fsm *fp)
 755 {
 756   /* Send config REQ please */
 757   struct physical *p = link2physical(fp->link);
 758   struct ipcp *ipcp = fsm2ipcp(fp);
 759   u_char buff[MAX_FSM_OPT_LEN];
 760   struct fsm_opt *o;
 761
 762   o = (struct fsm_opt *)buff;
 763
 764   if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) {
 765     memcpy(o->data, &ipcp->my_ip.s_addr, 4);
 766     INC_FSM_OPT(TY_IPADDR, 6, o);
 767   }
 768
 769   if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) {
 770     if (ipcp->heis1172) {
 771       u_int16_t proto = PROTO_VJCOMP;
 772
 773       ua_htons(&proto, o->data);
 774       INC_FSM_OPT(TY_COMPPROTO, 4, o);
 775     } else {
 776       struct compreq req;
 777
 778       req.proto = htons(ipcp->my_compproto >> 16);
 779       req.slots = (ipcp->my_compproto >> 8) & 255;
 780       req.compcid = ipcp->my_compproto & 1;
 781       memcpy(o->data, &req, 4);
 782       INC_FSM_OPT(TY_COMPPROTO, 6, o);
 783     }
 784   }
 785
 786   if (IsEnabled(ipcp->cfg.ns.dns_neg)) {
 787     if (!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) {
 788       memcpy(o->data, &ipcp->ns.dns[0].s_addr, 4);
 789       INC_FSM_OPT(TY_PRIMARY_DNS, 6, o);
 790     }
 791
 792     if (!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) {
 793       memcpy(o->data, &ipcp->ns.dns[1].s_addr, 4);
 794       INC_FSM_OPT(TY_SECONDARY_DNS, 6, o);
 795     }
 796   }
 797
 798   fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff,
 799              MB_IPCPOUT);
 800 }
 801
 802 static void
 803 IpcpSentTerminateReq(struct fsm *fp __unused)
 804 {
 805   /* Term REQ just sent by FSM */
 806 }
 807
 808 static void
 809 IpcpSendTerminateAck(struct fsm *fp, u_char id)
 810 {
 811   /* Send Term ACK please */
 812   fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT);
 813 }
 814
 815 static void
 816 IpcpLayerStart(struct fsm *fp)
 817 {
 818   /* We're about to start up ! */
 819   struct ipcp *ipcp = fsm2ipcp(fp);
 820
 821   log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name);
 822   throughput_start(&ipcp->throughput, "IPCP throughput",
 823                    Enabled(fp->bundle, OPT_THROUGHPUT));
 824   fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
 825   ipcp->peer_req = 0;
 826 }
 827
 828 static void
 829 IpcpLayerFinish(struct fsm *fp)
 830 {
 831   /* We're now down */
 832   struct ipcp *ipcp = fsm2ipcp(fp);
 833
 834   log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name);
 835   throughput_stop(&ipcp->throughput);
 836   throughput_log(&ipcp->throughput, LogIPCP, NULL);
 837 }
 838
 839 /*
 840  * Called from iface_Add() via ncp_IfaceAddrAdded()
 841  */
 842 void
 843 ipcp_IfaceAddrAdded(struct ipcp *ipcp, const struct iface_addr *addr)
 844 {
 845   struct bundle *bundle = ipcp->fsm.bundle;
 846
 847   if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL))
 848     ipcp_proxyarp(ipcp, arp_SetProxy, addr);
 849 }
 850
 851 /*
 852  * Called from iface_Clear() and iface_Delete() via ncp_IfaceAddrDeleted()
 853  */
 854 void
 855 ipcp_IfaceAddrDeleted(struct ipcp *ipcp, const struct iface_addr *addr)
 856 {
 857   struct bundle *bundle = ipcp->fsm.bundle;
 858
 859   if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL))
 860     ipcp_proxyarp(ipcp, arp_ClearProxy, addr);
 861 }
 862
 863 static void
 864 IpcpLayerDown(struct fsm *fp)
 865 {
 866   /* About to come down */
 867   struct ipcp *ipcp = fsm2ipcp(fp);
 868   static int recursing;
 869   char addr[16];
 870
 871   if (!recursing++) {
 872     snprintf(addr, sizeof addr, "%s", inet_ntoa(ipcp->my_ip));
 873     log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, addr);
 874
 875 #ifndef NORADIUS
 876     radius_Flush(&fp->bundle->radius);
 877     radius_Account(&fp->bundle->radius, &fp->bundle->radacct,
 878                    fp->bundle->links, RAD_STOP, &ipcp->throughput);
 879
 880     if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid)
 881       system_Select(fp->bundle, fp->bundle->radius.filterid, LINKDOWNFILE,
 882                     NULL, NULL);
 883     radius_StopTimer(&fp->bundle->radius);
 884 #endif
 885
 886     /*
 887      * XXX this stuff should really live in the FSM.  Our config should
 888      * associate executable sections in files with events.
 889      */
 890     if (system_Select(fp->bundle, addr, LINKDOWNFILE, NULL, NULL) < 0) {
 891       if (bundle_GetLabel(fp->bundle)) {
 892          if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
 893                           LINKDOWNFILE, NULL, NULL) < 0)
 894          system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
 895       } else
 896         system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
 897     }
 898
 899     ipcp_Setup(ipcp, INADDR_NONE);
 900   }
 901   recursing--;
 902 }
 903
 904 int
 905 ipcp_InterfaceUp(struct ipcp *ipcp)
 906 {
 907   if (!ipcp_SetIPaddress(ipcp, ipcp->my_ip, ipcp->peer_ip)) {
 908     log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n");
 909     return 0;
 910   }
 911
 912   if (!iface_SetFlags(ipcp->fsm.bundle->iface->name, IFF_UP)) {
 913     log_Printf(LogERROR, "ipcp_InterfaceUp: Can't set the IFF_UP flag on %s\n",
 914                ipcp->fsm.bundle->iface->name);
 915     return 0;
 916   }
 917
 918 #ifndef NONAT
 919   if (ipcp->fsm.bundle->NatEnabled)
 920     LibAliasSetAddress(la, ipcp->my_ip);
 921 #endif
 922
 923   return 1;
 924 }
 925
 926 static int
 927 IpcpLayerUp(struct fsm *fp)
 928 {
 929   /* We're now up */
 930   struct ipcp *ipcp = fsm2ipcp(fp);
 931   char tbuff[16];
 932
 933   log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name);
 934   snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip));
 935   log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n",
 936              tbuff, inet_ntoa(ipcp->peer_ip));
 937
 938   if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP)
 939     sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255);
 940
 941   if (!ipcp_InterfaceUp(ipcp))
 942     return 0;
 943
 944 #ifndef NORADIUS
 945   radius_Account_Set_Ip(&fp->bundle->radacct, &ipcp->peer_ip, &ipcp->ifmask);
 946   radius_Account(&fp->bundle->radius, &fp->bundle->radacct, fp->bundle->links,
 947                  RAD_START, &ipcp->throughput);
 948
 949   if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid)
 950     system_Select(fp->bundle, fp->bundle->radius.filterid, LINKUPFILE,
 951                   NULL, NULL);
 952   radius_StartTimer(fp->bundle);
 953 #endif
 954
 955   /*
 956    * XXX this stuff should really live in the FSM.  Our config should
 957    * associate executable sections in files with events.
 958    */
 959   if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) {
 960     if (bundle_GetLabel(fp->bundle)) {
 961       if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
 962                        LINKUPFILE, NULL, NULL) < 0)
 963         system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
 964     } else
 965       system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
 966   }
 967
 968   fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
 969   log_DisplayPrompts();
 970
 971   return 1;
 972 }
 973
 974 static void
 975 ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec)
 976 {
 977   struct bundle *bundle = ipcp->fsm.bundle;
 978   struct iface *iface = bundle->iface;
 979   struct in_addr myaddr, peer;
 980   unsigned n;
 981
 982   if (iplist_isvalid(&ipcp->cfg.peer_list)) {
 983     ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
 984     if (ip.s_addr == INADDR_ANY ||
 985         iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 ||
 986         !ipcp_SetIPaddress(ipcp, myaddr, ip)) {
 987       log_Printf(LogIPCP, "%s: Address invalid or already in use\n",
 988                  inet_ntoa(ip));
 989       /*
 990        * If we've already had a valid address configured for the peer,
 991        * try NAKing with that so that we don't have to upset things
 992        * too much.
 993        */
 994       for (n = 0; n < iface->addrs; n++) {
 995         if (!ncpaddr_getip4(&iface->addr[n].peer, &peer))
 996           continue;
 997         if (iplist_ip2pos(&ipcp->cfg.peer_list, peer) >= 0) {
 998           ipcp->peer_ip = peer;
 999           break;
1000         }
1001       }
1002
1003       if (n == iface->addrs) {
1004         /* Just pick an IP number from our list */
1005         ipcp->peer_ip = ChooseHisAddr(bundle, myaddr);
1006       }
1007
1008       if (ipcp->peer_ip.s_addr == INADDR_ANY) {
1009         *dec->rejend++ = TY_IPADDR;
1010         *dec->rejend++ = 6;
1011         memcpy(dec->rejend, &ip.s_addr, 4);
1012         dec->rejend += 4;
1013       } else {
1014         *dec->nakend++ = TY_IPADDR;
1015         *dec->nakend++ = 6;
1016         memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
1017         dec->nakend += 4;
1018       }
1019       return;
1020     }
1021   } else if (ip.s_addr == INADDR_ANY ||
1022              !ncprange_containsip4(&ipcp->cfg.peer_range, ip)) {
1023     /*
1024      * If the destination address is not acceptable, NAK with what we
1025      * want to use.
1026      */
1027     *dec->nakend++ = TY_IPADDR;
1028     *dec->nakend++ = 6;
1029     for (n = 0; n < iface->addrs; n++)
1030       if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) {
1031         /* We prefer the already-configured address */
1032         ncpaddr_getip4addr(&iface->addr[n].peer, (u_int32_t *)dec->nakend);
1033         break;
1034       }
1035
1036     if (n == iface->addrs)
1037       memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
1038
1039     dec->nakend += 4;
1040     return;
1041   }
1042
1043   ipcp->peer_ip = ip;
1044   *dec->ackend++ = TY_IPADDR;
1045   *dec->ackend++ = 6;
1046   memcpy(dec->ackend, &ip.s_addr, 4);
1047   dec->ackend += 4;
1048 }
1049
1050 static void
1051 IpcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type,
1052                  struct fsm_decode *dec)
1053 {
1054   /* Deal with incoming PROTO_IPCP */
1055   struct ncpaddr ncpaddr;
1056   struct ipcp *ipcp = fsm2ipcp(fp);
1057   int gotdnsnak;
1058   u_int32_t compproto;
1059   struct compreq pcomp;
1060   struct in_addr ipaddr, dstipaddr, have_ip;
1061   char tbuff[100], tbuff2[100];
1062   struct fsm_opt *opt, nak;
1063
1064   gotdnsnak = 0;
1065
1066   while (end - cp >= (int)sizeof(opt->hdr)) {
1067     if ((opt = fsm_readopt(&cp)) == NULL)
1068       break;
1069
1070     snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id),
1071              opt->hdr.len);
1072
1073     switch (opt->hdr.id) {
1074     case TY_IPADDR:             /* RFC1332 */
1075       memcpy(&ipaddr.s_addr, opt->data, 4);
1076       log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1077
1078       switch (mode_type) {
1079       case MODE_REQ:
1080         ipcp->peer_req = 1;
1081         ipcp_ValidateReq(ipcp, ipaddr, dec);
1082         break;
1083
1084       case MODE_NAK:
1085         if (ncprange_containsip4(&ipcp->cfg.my_range, ipaddr)) {
1086           /* Use address suggested by peer */
1087           snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff,
1088                    inet_ntoa(ipcp->my_ip));
1089           log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr));
1090           ipcp->my_ip = ipaddr;
1091           ncpaddr_setip4(&ncpaddr, ipcp->my_ip);
1092           bundle_AdjustFilters(fp->bundle, &ncpaddr, NULL);
1093         } else {
1094           log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE,
1095                     "%s: Unacceptable address!\n", inet_ntoa(ipaddr));
1096           fsm_Close(&ipcp->fsm);
1097         }
1098         break;
1099
1100       case MODE_REJ:
1101         ipcp->peer_reject |= (1 << opt->hdr.id);
1102         break;
1103       }
1104       break;
1105
1106     case TY_COMPPROTO:
1107       memcpy(&pcomp, opt->data, sizeof pcomp);
1108       compproto = (ntohs(pcomp.proto) << 16) + ((int)pcomp.slots << 8) +
1109                   pcomp.compcid;
1110       log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto));
1111
1112       switch (mode_type) {
1113       case MODE_REQ:
1114         if (!IsAccepted(ipcp->cfg.vj.neg))
1115           fsm_rej(dec, opt);
1116         else {
1117           switch (opt->hdr.len) {
1118           case 4:               /* RFC1172 */
1119             if (ntohs(pcomp.proto) == PROTO_VJCOMP) {
1120               log_Printf(LogWARN, "Peer is speaking RFC1172 compression "
1121                          "protocol !\n");
1122               ipcp->heis1172 = 1;
1123               ipcp->peer_compproto = compproto;
1124               fsm_ack(dec, opt);
1125             } else {
1126               pcomp.proto = htons(PROTO_VJCOMP);
1127               nak.hdr.id = TY_COMPPROTO;
1128               nak.hdr.len = 4;
1129               memcpy(nak.data, &pcomp, 2);
1130               fsm_nak(dec, &nak);
1131             }
1132             break;
1133           case 6:               /* RFC1332 */
1134             if (ntohs(pcomp.proto) == PROTO_VJCOMP) {
1135               /* We know pcomp.slots' max value == MAX_VJ_STATES */
1136               if (pcomp.slots >= MIN_VJ_STATES) {
1137                 /* Ok, we can do that */
1138                 ipcp->peer_compproto = compproto;
1139                 ipcp->heis1172 = 0;
1140                 fsm_ack(dec, opt);
1141               } else {
1142                 /* Get as close as we can to what he wants */
1143                 ipcp->heis1172 = 0;
1144                 pcomp.slots = MIN_VJ_STATES;
1145                 nak.hdr.id = TY_COMPPROTO;
1146                 nak.hdr.len = 4;
1147                 memcpy(nak.data, &pcomp, 2);
1148                 fsm_nak(dec, &nak);
1149               }
1150             } else {
1151               /* What we really want */
1152               pcomp.proto = htons(PROTO_VJCOMP);
1153               pcomp.slots = DEF_VJ_STATES;
1154               pcomp.compcid = 1;
1155               nak.hdr.id = TY_COMPPROTO;
1156               nak.hdr.len = 6;
1157               memcpy(nak.data, &pcomp, sizeof pcomp);
1158               fsm_nak(dec, &nak);
1159             }
1160             break;
1161           default:
1162             fsm_rej(dec, opt);
1163             break;
1164           }
1165         }
1166         break;
1167
1168       case MODE_NAK:
1169         if (ntohs(pcomp.proto) == PROTO_VJCOMP) {
1170           /* We know pcomp.slots' max value == MAX_VJ_STATES */
1171           if (pcomp.slots < MIN_VJ_STATES)
1172             pcomp.slots = MIN_VJ_STATES;
1173           compproto = (ntohs(pcomp.proto) << 16) + (pcomp.slots << 8) +
1174                       pcomp.compcid;
1175         } else
1176           compproto = 0;
1177         log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n",
1178                    tbuff, ipcp->my_compproto, compproto);
1179         ipcp->my_compproto = compproto;
1180         break;
1181
1182       case MODE_REJ:
1183         ipcp->peer_reject |= (1 << opt->hdr.id);
1184         break;
1185       }
1186       break;
1187
1188     case TY_IPADDRS:            /* RFC1172 */
1189       memcpy(&ipaddr.s_addr, opt->data, 4);
1190       memcpy(&dstipaddr.s_addr, opt->data + 4, 4);
1191       snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr));
1192       log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr));
1193
1194       switch (mode_type) {
1195       case MODE_REQ:
1196         fsm_rej(dec, opt);
1197         break;
1198
1199       case MODE_NAK:
1200       case MODE_REJ:
1201         break;
1202       }
1203       break;
1204
1205     case TY_PRIMARY_DNS:        /* DNS negotiation (rfc1877) */
1206     case TY_SECONDARY_DNS:
1207       memcpy(&ipaddr.s_addr, opt->data, 4);
1208       log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1209
1210       switch (mode_type) {
1211       case MODE_REQ:
1212         if (!IsAccepted(ipcp->cfg.ns.dns_neg)) {
1213           ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1214           fsm_rej(dec, opt);
1215           break;
1216         }
1217         have_ip = ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1];
1218
1219         if (opt->hdr.id == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr &&
1220             ipaddr.s_addr == ipcp->ns.dns[1].s_addr) {
1221           /* Swap 'em 'round */
1222           ipcp->ns.dns[0] = ipcp->ns.dns[1];
1223           ipcp->ns.dns[1] = have_ip;
1224           have_ip = ipcp->ns.dns[0];
1225         }
1226
1227         if (ipaddr.s_addr != have_ip.s_addr) {
1228           /*
1229            * The client has got the DNS stuff wrong (first request) so
1230            * we'll tell 'em how it is
1231            */
1232           nak.hdr.id = opt->hdr.id;
1233           nak.hdr.len = 6;
1234           memcpy(nak.data, &have_ip.s_addr, 4);
1235           fsm_nak(dec, &nak);
1236         } else {
1237           /*
1238            * Otherwise they have it right (this time) so we send an ack packet
1239            * back confirming it... end of story
1240            */
1241           fsm_ack(dec, opt);
1242         }
1243         break;
1244
1245       case MODE_NAK:
1246         if (IsEnabled(ipcp->cfg.ns.dns_neg)) {
1247           gotdnsnak = 1;
1248           memcpy(&ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1].s_addr,
1249                  opt->data, 4);
1250         }
1251         break;
1252
1253       case MODE_REJ:            /* Can't do much, stop asking */
1254         ipcp->peer_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1255         break;
1256       }
1257       break;
1258
1259     case TY_PRIMARY_NBNS:       /* M$ NetBIOS nameserver hack (rfc1877) */
1260     case TY_SECONDARY_NBNS:
1261       memcpy(&ipaddr.s_addr, opt->data, 4);
1262       log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1263
1264       switch (mode_type) {
1265       case MODE_REQ:
1266         have_ip.s_addr =
1267           ipcp->cfg.ns.nbns[opt->hdr.id == TY_PRIMARY_NBNS ? 0 : 1].s_addr;
1268
1269         if (have_ip.s_addr == INADDR_ANY) {
1270           log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n");
1271           ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1272           fsm_rej(dec, opt);
1273           break;
1274         }
1275
1276         if (ipaddr.s_addr != have_ip.s_addr) {
1277           nak.hdr.id = opt->hdr.id;
1278           nak.hdr.len = 6;
1279           memcpy(nak.data, &have_ip.s_addr, 4);
1280           fsm_nak(dec, &nak);
1281         } else
1282           fsm_ack(dec, opt);
1283         break;
1284
1285       case MODE_NAK:
1286         log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", opt->hdr.id);
1287         break;
1288
1289       case MODE_REJ:
1290         log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", opt->hdr.id);
1291         break;
1292       }
1293       break;
1294
1295     default:
1296       if (mode_type != MODE_NOP) {
1297         ipcp->my_reject |= (1 << opt->hdr.id);
1298         fsm_rej(dec, opt);
1299       }
1300       break;
1301     }
1302   }
1303
1304   if (gotdnsnak) {
1305     if (ipcp->ns.writable) {
1306       log_Printf(LogDEBUG, "Updating resolver\n");
1307       if (!ipcp_WriteDNS(ipcp)) {
1308         ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS));
1309         ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS));
1310       } else
1311         bundle_AdjustDNS(fp->bundle);
1312     } else {
1313       log_Printf(LogDEBUG, "Not updating resolver (readonly)\n");
1314       bundle_AdjustDNS(fp->bundle);
1315     }
1316   }
1317
1318   if (mode_type != MODE_NOP) {
1319     if (mode_type == MODE_REQ && !ipcp->peer_req) {
1320       if (dec->rejend == dec->rej && dec->nakend == dec->nak) {
1321         /*
1322          * Pretend the peer has requested an IP.
1323          * We do this to ensure that we only send one NAK if the only
1324          * reason for the NAK is because the peer isn't sending a
1325          * TY_IPADDR REQ.  This stops us from repeatedly trying to tell
1326          * the peer that we have to have an IP address on their end.
1327          */
1328         ipcp->peer_req = 1;
1329       }
1330       ipaddr.s_addr = INADDR_ANY;
1331       ipcp_ValidateReq(ipcp, ipaddr, dec);
1332     }
1333     fsm_opt_normalise(dec);
1334   }
1335 }
1336
1337 extern struct mbuf *
1338 ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
1339 {
1340   /* Got PROTO_IPCP from link */
1341   m_settype(bp, MB_IPCPIN);
1342   if (bundle_Phase(bundle) == PHASE_NETWORK)
1343     fsm_Input(&bundle->ncp.ipcp.fsm, bp);
1344   else {
1345     if (bundle_Phase(bundle) < PHASE_NETWORK)
1346       log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n",
1347                  l->name, bundle_PhaseName(bundle));
1348     m_freem(bp);
1349   }
1350   return NULL;
1351 }
1352
1353 int
1354 ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr)
1355 {
1356   struct ipcp *ipcp = &bundle->ncp.ipcp;
1357   struct in_addr myaddr;
1358
1359   memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
1360   iplist_reset(&ipcp->cfg.peer_list);
1361   ipcp->peer_ip = hisaddr;
1362   ncprange_setip4host(&ipcp->cfg.peer_range, hisaddr);
1363   ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
1364
1365   return ipcp_SetIPaddress(ipcp, myaddr, hisaddr);
1366 }
1367
1368 int
1369 ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr)
1370 {
1371   struct in_addr myaddr;
1372   struct ncp *ncp = &bundle->ncp;
1373   struct ipcp *ipcp = &ncp->ipcp;
1374   struct ncpaddr ncpaddr;
1375
1376   /* Use `hisaddr' for the peers address (set iface if `setaddr') */
1377   memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
1378   iplist_reset(&ipcp->cfg.peer_list);
1379   if (strpbrk(hisaddr, ",-")) {
1380     iplist_setsrc(&ipcp->cfg.peer_list, hisaddr);
1381     if (iplist_isvalid(&ipcp->cfg.peer_list)) {
1382       iplist_setrandpos(&ipcp->cfg.peer_list);
1383       ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip);
1384       if (ipcp->peer_ip.s_addr == INADDR_ANY) {
1385         log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src);
1386         return 0;
1387       }
1388       ncprange_setip4host(&ipcp->cfg.peer_range, ipcp->peer_ip);
1389     } else {
1390       log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr);
1391       return 0;
1392     }
1393   } else if (ncprange_aton(&ipcp->cfg.peer_range, ncp, hisaddr) != 0) {
1394     if (ncprange_family(&ipcp->cfg.my_range) != AF_INET) {
1395       log_Printf(LogWARN, "%s: Not an AF_INET address !\n", hisaddr);
1396       return 0;
1397     }
1398     ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
1399     ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip);
1400
1401     if (setaddr && !ipcp_SetIPaddress(ipcp, myaddr, ipcp->peer_ip))
1402       return 0;
1403   } else
1404     return 0;
1405
1406   ncpaddr_setip4(&ncpaddr, ipcp->peer_ip);
1407   bundle_AdjustFilters(bundle, NULL, &ncpaddr);
1408
1409   return 1;     /* Ok */
1410 }
1411
1412 struct in_addr
1413 addr2mask(struct in_addr addr)
1414 {
1415   u_int32_t haddr = ntohl(addr.s_addr);
1416
1417   haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET :
1418           IN_CLASSB(haddr) ? IN_CLASSB_NET :
1419           IN_CLASSC_NET;
1420   addr.s_addr = htonl(haddr);
1421
1422   return addr;
1423 }
1424
1425 size_t
1426 ipcp_QueueLen(struct ipcp *ipcp)
1427 {
1428   struct mqueue *q;
1429   size_t result;
1430
1431   result = 0;
1432   for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++)
1433     result += q->len;
1434
1435   return result;
1436 }
1437
1438 int
1439 ipcp_PushPacket(struct ipcp *ipcp, struct link *l)
1440 {
1441   struct bundle *bundle = ipcp->fsm.bundle;
1442   struct mqueue *queue;
1443   struct mbuf *bp;
1444   int m_len;
1445   u_int32_t secs = 0;
1446   unsigned alivesecs = 0;
1447
1448   if (ipcp->fsm.state != ST_OPENED)
1449     return 0;
1450
1451   /*
1452    * If ccp is not open but is required, do nothing.
1453    */
1454   if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) {
1455     log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name);
1456     return 0;
1457   }
1458
1459   queue = ipcp->Queue + IPCP_QUEUES(ipcp) - 1;
1460   do {
1461     if (queue->top) {
1462       bp = m_dequeue(queue);
1463       bp = mbuf_Read(bp, &secs, sizeof secs);
1464       bp = m_pullup(bp);
1465       m_len = m_length(bp);
1466       if (!FilterCheck(MBUF_CTOP(bp), AF_INET, &bundle->filter.alive,
1467                        &alivesecs)) {
1468         if (secs == 0)
1469           secs = alivesecs;
1470         bundle_StartIdleTimer(bundle, secs);
1471       }
1472       link_PushPacket(l, bp, bundle, 0, PROTO_IP);
1473       ipcp_AddOutOctets(ipcp, m_len);
1474       return 1;
1475     }
1476   } while (queue-- != ipcp->Queue);
1477
1478   return 0;
1479 }