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: src/usr.sbin/ppp/ipcp.c,v 1.90.2.12 2002/09/28 10:16:25 brian Exp $
  29  * $DragonFly: src/usr.sbin/ppp/ipcp.c,v 1.2 2003/06/17 04:30:00 dillon Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <netinet/in_systm.h>
  34 #include <netinet/in.h>
  35 #include <netinet/ip.h>
  36 #include <arpa/inet.h>
  37 #include <sys/socket.h>
  38 #include <net/if.h>
  39 #include <net/route.h>
  40 #include <netdb.h>
  41 #include <sys/un.h>
  42
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <resolv.h>
  46 #include <stdarg.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <sys/stat.h>
  50 #include <termios.h>
  51 #include <unistd.h>
  52
  53 #ifndef NONAT
  54 #ifdef LOCALNAT
  55 #include "alias.h"
  56 #else
  57 #include <alias.h>
  58 #endif
  59 #endif
  60
  61 #include "layer.h"
  62 #include "ua.h"
  63 #include "defs.h"
  64 #include "command.h"
  65 #include "mbuf.h"
  66 #include "log.h"
  67 #include "timer.h"
  68 #include "fsm.h"
  69 #include "proto.h"
  70 #include "iplist.h"
  71 #include "throughput.h"
  72 #include "slcompress.h"
  73 #include "lqr.h"
  74 #include "hdlc.h"
  75 #include "lcp.h"
  76 #include "ncpaddr.h"
  77 #include "ip.h"
  78 #include "ipcp.h"
  79 #include "filter.h"
  80 #include "descriptor.h"
  81 #include "vjcomp.h"
  82 #include "async.h"
  83 #include "ccp.h"
  84 #include "link.h"
  85 #include "physical.h"
  86 #include "mp.h"
  87 #ifndef NORADIUS
  88 #include "radius.h"
  89 #endif
  90 #include "ipv6cp.h"
  91 #include "ncp.h"
  92 #include "bundle.h"
  93 #include "id.h"
  94 #include "arp.h"
  95 #include "systems.h"
  96 #include "prompt.h"
  97 #include "route.h"
  98 #include "iface.h"
  99
 100 #undef REJECTED
 101 #define REJECTED(p, x)  ((p)->peer_reject & (1<<(x)))
 102 #define issep(ch) ((ch) == ' ' || (ch) == '\t')
 103 #define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.')
 104
 105 struct compreq {
 106   u_short proto;
 107   u_char slots;
 108   u_char compcid;
 109 };
 110
 111 static int IpcpLayerUp(struct fsm *);
 112 static void IpcpLayerDown(struct fsm *);
 113 static void IpcpLayerStart(struct fsm *);
 114 static void IpcpLayerFinish(struct fsm *);
 115 static void IpcpInitRestartCounter(struct fsm *, int);
 116 static void IpcpSendConfigReq(struct fsm *);
 117 static void IpcpSentTerminateReq(struct fsm *);
 118 static void IpcpSendTerminateAck(struct fsm *, u_char);
 119 static void IpcpDecodeConfig(struct fsm *, u_char *, u_char *, int,
 120                              struct fsm_decode *);
 121
 122 static struct fsm_callbacks ipcp_Callbacks = {
 123   IpcpLayerUp,
 124   IpcpLayerDown,
 125   IpcpLayerStart,
 126   IpcpLayerFinish,
 127   IpcpInitRestartCounter,
 128   IpcpSendConfigReq,
 129   IpcpSentTerminateReq,
 130   IpcpSendTerminateAck,
 131   IpcpDecodeConfig,
 132   fsm_NullRecvResetReq,
 133   fsm_NullRecvResetAck
 134 };
 135
 136 static const char *
 137 protoname(int proto)
 138 {
 139   static struct {
 140     int id;
 141     const char *txt;
 142   } cftypes[] = {
 143     /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */
 144     { 1, "IPADDRS" },           /* IP-Addresses */      /* deprecated */
 145     { 2, "COMPPROTO" },         /* IP-Compression-Protocol */
 146     { 3, "IPADDR" },            /* IP-Address */
 147     { 129, "PRIDNS" },          /* 129: Primary DNS Server Address */
 148     { 130, "PRINBNS" },         /* 130: Primary NBNS Server Address */
 149     { 131, "SECDNS" },          /* 131: Secondary DNS Server Address */
 150     { 132, "SECNBNS" }          /* 132: Secondary NBNS Server Address */
 151   };
 152   unsigned f;
 153
 154   for (f = 0; f < sizeof cftypes / sizeof *cftypes; f++)
 155     if (cftypes[f].id == proto)
 156       return cftypes[f].txt;
 157
 158   return NumStr(proto, NULL, 0);
 159 }
 160
 161 void
 162 ipcp_AddInOctets(struct ipcp *ipcp, int n)
 163 {
 164   throughput_addin(&ipcp->throughput, n);
 165 }
 166
 167 void
 168 ipcp_AddOutOctets(struct ipcp *ipcp, int n)
 169 {
 170   throughput_addout(&ipcp->throughput, n);
 171 }
 172
 173 void
 174 ipcp_LoadDNS(struct ipcp *ipcp)
 175 {
 176   int fd;
 177
 178   ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr = INADDR_NONE;
 179
 180   if (ipcp->ns.resolv != NULL) {
 181     free(ipcp->ns.resolv);
 182     ipcp->ns.resolv = NULL;
 183   }
 184   if (ipcp->ns.resolv_nons != NULL) {
 185     free(ipcp->ns.resolv_nons);
 186     ipcp->ns.resolv_nons = NULL;
 187   }
 188   ipcp->ns.resolver = 0;
 189
 190   if ((fd = open(_PATH_RESCONF, O_RDONLY)) != -1) {
 191     struct stat st;
 192
 193     if (fstat(fd, &st) == 0) {
 194       ssize_t got;
 195
 196       if ((ipcp->ns.resolv_nons = (char *)malloc(st.st_size + 1)) == NULL)
 197         log_Printf(LogERROR, "Failed to malloc %lu for %s: %s\n",
 198                    (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno));
 199       else if ((ipcp->ns.resolv = (char *)malloc(st.st_size + 1)) == NULL) {
 200         log_Printf(LogERROR, "Failed(2) to malloc %lu for %s: %s\n",
 201                    (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno));
 202         free(ipcp->ns.resolv_nons);
 203         ipcp->ns.resolv_nons = NULL;
 204       } else if ((got = read(fd, ipcp->ns.resolv, st.st_size)) != st.st_size) {
 205         if (got == -1)
 206           log_Printf(LogERROR, "Failed to read %s: %s\n",
 207                      _PATH_RESCONF, strerror(errno));
 208         else
 209           log_Printf(LogERROR, "Failed to read %s, got %lu not %lu\n",
 210                      _PATH_RESCONF, (unsigned long)got,
 211                      (unsigned long)st.st_size);
 212         free(ipcp->ns.resolv_nons);
 213         ipcp->ns.resolv_nons = NULL;
 214         free(ipcp->ns.resolv);
 215         ipcp->ns.resolv = NULL;
 216       } else {
 217         char *cp, *cp_nons, *ncp, ch;
 218         int n;
 219
 220         ipcp->ns.resolv[st.st_size] = '\0';
 221         ipcp->ns.resolver = 1;
 222
 223         cp_nons = ipcp->ns.resolv_nons;
 224         cp = ipcp->ns.resolv;
 225         n = 0;
 226
 227         while ((ncp = strstr(cp, "nameserver")) != NULL) {
 228           if (ncp != cp) {
 229             memcpy(cp_nons, cp, ncp - cp);
 230             cp_nons += ncp - cp;
 231           }
 232           if ((ncp != cp && ncp[-1] != '\n') || !issep(ncp[10])) {
 233             memcpy(cp_nons, ncp, 9);
 234             cp_nons += 9;
 235             cp = ncp + 9;       /* Can't match "nameserver" at cp... */
 236             continue;
 237           }
 238
 239           for (cp = ncp + 11; issep(*cp); cp++) /* Skip whitespace */
 240             ;
 241
 242           for (ncp = cp; isip(*ncp); ncp++)             /* Jump over IP */
 243             ;
 244
 245           ch = *ncp;
 246           *ncp = '\0';
 247           if (n < 2 && inet_aton(cp, ipcp->ns.dns))
 248             n++;
 249           *ncp = ch;
 250
 251           if ((cp = strchr(ncp, '\n')) == NULL) /* Point at next line */
 252             cp = ncp + strlen(ncp);
 253           else
 254             cp++;
 255         }
 256         strcpy(cp_nons, cp);    /* Copy the end - including the NUL */
 257         cp_nons += strlen(cp_nons) - 1;
 258         while (cp_nons >= ipcp->ns.resolv_nons && *cp_nons == '\n')
 259           *cp_nons-- = '\0';
 260         if (n == 2 && ipcp->ns.dns[0].s_addr == INADDR_ANY) {
 261           ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr;
 262           ipcp->ns.dns[1].s_addr = INADDR_ANY;
 263         }
 264         bundle_AdjustDNS(ipcp->fsm.bundle);
 265       }
 266     } else
 267       log_Printf(LogERROR, "Failed to stat opened %s: %s\n",
 268                  _PATH_RESCONF, strerror(errno));
 269
 270     close(fd);
 271   }
 272 }
 273
 274 int
 275 ipcp_WriteDNS(struct ipcp *ipcp)
 276 {
 277   const char *paddr;
 278   mode_t mask;
 279   FILE *fp;
 280
 281   if (ipcp->ns.dns[0].s_addr == INADDR_ANY &&
 282       ipcp->ns.dns[1].s_addr == INADDR_ANY) {
 283     log_Printf(LogIPCP, "%s not modified: All nameservers NAKd\n",
 284               _PATH_RESCONF);
 285     return 0;
 286   }
 287
 288   if (ipcp->ns.dns[0].s_addr == INADDR_ANY) {
 289     ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr;
 290     ipcp->ns.dns[1].s_addr = INADDR_ANY;
 291   }
 292
 293   mask = umask(022);
 294   if ((fp = ID0fopen(_PATH_RESCONF, "w")) != NULL) {
 295     umask(mask);
 296     if (ipcp->ns.resolv_nons)
 297       fputs(ipcp->ns.resolv_nons, fp);
 298     paddr = inet_ntoa(ipcp->ns.dns[0]);
 299     log_Printf(LogIPCP, "Primary nameserver set to %s\n", paddr);
 300     fprintf(fp, "\nnameserver %s\n", paddr);
 301     if (ipcp->ns.dns[1].s_addr != INADDR_ANY &&
 302         ipcp->ns.dns[1].s_addr != INADDR_NONE &&
 303         ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) {
 304       paddr = inet_ntoa(ipcp->ns.dns[1]);
 305       log_Printf(LogIPCP, "Secondary nameserver set to %s\n", paddr);
 306       fprintf(fp, "nameserver %s\n", paddr);
 307     }
 308     if (fclose(fp) == EOF) {
 309       log_Printf(LogERROR, "write(): Failed updating %s: %s\n", _PATH_RESCONF,
 310                  strerror(errno));
 311       return 0;
 312     }
 313   } else
 314     umask(mask);
 315
 316   return 1;
 317 }
 318
 319 void
 320 ipcp_RestoreDNS(struct ipcp *ipcp)
 321 {
 322   if (ipcp->ns.resolver) {
 323     ssize_t got, len;
 324     int fd;
 325
 326     if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_TRUNC, 0644)) != -1) {
 327       len = strlen(ipcp->ns.resolv);
 328       if ((got = write(fd, ipcp->ns.resolv, len)) != len) {
 329         if (got == -1)
 330           log_Printf(LogERROR, "Failed rewriting %s: write: %s\n",
 331                      _PATH_RESCONF, strerror(errno));
 332         else
 333           log_Printf(LogERROR, "Failed rewriting %s: wrote %ld of %ld\n",
 334                      _PATH_RESCONF, (long)got, (long)len);
 335       }
 336       close(fd);
 337     } else
 338       log_Printf(LogERROR, "Failed rewriting %s: open: %s\n", _PATH_RESCONF,
 339                  strerror(errno));
 340   } else if (remove(_PATH_RESCONF) == -1)
 341     log_Printf(LogERROR, "Failed removing %s: %s\n", _PATH_RESCONF,
 342                strerror(errno));
 343
 344 }
 345
 346 int
 347 ipcp_Show(struct cmdargs const *arg)
 348 {
 349   struct ipcp *ipcp = &arg->bundle->ncp.ipcp;
 350
 351   prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name,
 352                 State2Nam(ipcp->fsm.state));
 353   if (ipcp->fsm.state == ST_OPENED) {
 354     prompt_Printf(arg->prompt, " His side:        %s, %s\n",
 355                   inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto));
 356     prompt_Printf(arg->prompt, " My side:         %s, %s\n",
 357                   inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto));
 358     prompt_Printf(arg->prompt, " Queued packets:  %lu\n",
 359                   (unsigned long)ipcp_QueueLen(ipcp));
 360   }
 361
 362   prompt_Printf(arg->prompt, "\nDefaults:\n");
 363   prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config"
 364                 " REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout,
 365                 ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s",
 366                 ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s");
 367   prompt_Printf(arg->prompt, " My Address:      %s\n",
 368                 ncprange_ntoa(&ipcp->cfg.my_range));
 369   if (ipcp->cfg.HaveTriggerAddress)
 370     prompt_Printf(arg->prompt, " Trigger address: %s\n",
 371                   inet_ntoa(ipcp->cfg.TriggerAddress));
 372
 373   prompt_Printf(arg->prompt, " VJ compression:  %s (%d slots %s slot "
 374                 "compression)\n", command_ShowNegval(ipcp->cfg.vj.neg),
 375                 ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without");
 376
 377   if (iplist_isvalid(&ipcp->cfg.peer_list))
 378     prompt_Printf(arg->prompt, " His Address:     %s\n",
 379                   ipcp->cfg.peer_list.src);
 380   else
 381     prompt_Printf(arg->prompt, " His Address:     %s\n",
 382                   ncprange_ntoa(&ipcp->cfg.peer_range));
 383
 384   prompt_Printf(arg->prompt, " DNS:             %s",
 385                 ipcp->cfg.ns.dns[0].s_addr == INADDR_NONE ?
 386                 "none" : inet_ntoa(ipcp->cfg.ns.dns[0]));
 387   if (ipcp->cfg.ns.dns[1].s_addr != INADDR_NONE)
 388     prompt_Printf(arg->prompt, ", %s",
 389                   inet_ntoa(ipcp->cfg.ns.dns[1]));
 390   prompt_Printf(arg->prompt, ", %s\n",
 391                 command_ShowNegval(ipcp->cfg.ns.dns_neg));
 392   prompt_Printf(arg->prompt, " Resolver DNS:    %s",
 393                 ipcp->ns.dns[0].s_addr == INADDR_NONE ?
 394                 "none" : inet_ntoa(ipcp->ns.dns[0]));
 395   if (ipcp->ns.dns[1].s_addr != INADDR_NONE &&
 396       ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr)
 397     prompt_Printf(arg->prompt, ", %s",
 398                   inet_ntoa(ipcp->ns.dns[1]));
 399   prompt_Printf(arg->prompt, "\n NetBIOS NS:      %s, ",
 400                 inet_ntoa(ipcp->cfg.ns.nbns[0]));
 401   prompt_Printf(arg->prompt, "%s\n\n",
 402                 inet_ntoa(ipcp->cfg.ns.nbns[1]));
 403
 404   throughput_disp(&ipcp->throughput, arg->prompt);
 405
 406   return 0;
 407 }
 408
 409 int
 410 ipcp_vjset(struct cmdargs const *arg)
 411 {
 412   if (arg->argc != arg->argn+2)
 413     return -1;
 414   if (!strcasecmp(arg->argv[arg->argn], "slots")) {
 415     int slots;
 416
 417     slots = atoi(arg->argv[arg->argn+1]);
 418     if (slots < 4 || slots > 16)
 419       return 1;
 420     arg->bundle->ncp.ipcp.cfg.vj.slots = slots;
 421     return 0;
 422   } else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) {
 423     if (!strcasecmp(arg->argv[arg->argn+1], "on"))
 424       arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1;
 425     else if (!strcasecmp(arg->argv[arg->argn+1], "off"))
 426       arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0;
 427     else
 428       return 2;
 429     return 0;
 430   }
 431   return -1;
 432 }
 433
 434 void
 435 ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l,
 436           const struct fsm_parent *parent)
 437 {
 438   struct hostent *hp;
 439   struct in_addr host;
 440   char name[MAXHOSTNAMELEN];
 441   static const char * const timer_names[] =
 442     {"IPCP restart", "IPCP openmode", "IPCP stopped"};
 443
 444   fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP,
 445            bundle, l, parent, &ipcp_Callbacks, timer_names);
 446
 447   ipcp->cfg.vj.slots = DEF_VJ_STATES;
 448   ipcp->cfg.vj.slotcomp = 1;
 449   memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range);
 450
 451   host.s_addr = htonl(INADDR_LOOPBACK);
 452   ipcp->cfg.netmask.s_addr = INADDR_ANY;
 453   if (gethostname(name, sizeof name) == 0) {
 454     hp = gethostbyname(name);
 455     if (hp && hp->h_addrtype == AF_INET && hp->h_length == sizeof host.s_addr)
 456       memcpy(&host.s_addr, hp->h_addr, sizeof host.s_addr);
 457   }
 458   ncprange_setip4(&ipcp->cfg.my_range, host, ipcp->cfg.netmask);
 459   ncprange_setip4(&ipcp->cfg.peer_range, ipcp->cfg.netmask, ipcp->cfg.netmask);
 460
 461   iplist_setsrc(&ipcp->cfg.peer_list, "");
 462   ipcp->cfg.HaveTriggerAddress = 0;
 463
 464   ipcp->cfg.ns.dns[0].s_addr = INADDR_NONE;
 465   ipcp->cfg.ns.dns[1].s_addr = INADDR_NONE;
 466   ipcp->cfg.ns.dns_neg = 0;
 467   ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY;
 468   ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY;
 469
 470   ipcp->cfg.fsm.timeout = DEF_FSMRETRY;
 471   ipcp->cfg.fsm.maxreq = DEF_FSMTRIES;
 472   ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES;
 473   ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED;
 474
 475   memset(&ipcp->vj, '\0', sizeof ipcp->vj);
 476
 477   ipcp->ns.resolv = NULL;
 478   ipcp->ns.resolv_nons = NULL;
 479   ipcp->ns.writable = 1;
 480   ipcp_LoadDNS(ipcp);
 481
 482   throughput_init(&ipcp->throughput, SAMPLE_PERIOD);
 483   memset(ipcp->Queue, '\0', sizeof ipcp->Queue);
 484   ipcp_Setup(ipcp, INADDR_NONE);
 485 }
 486
 487 void
 488 ipcp_Destroy(struct ipcp *ipcp)
 489 {
 490   throughput_destroy(&ipcp->throughput);
 491
 492   if (ipcp->ns.resolv != NULL) {
 493     free(ipcp->ns.resolv);
 494     ipcp->ns.resolv = NULL;
 495   }
 496   if (ipcp->ns.resolv_nons != NULL) {
 497     free(ipcp->ns.resolv_nons);
 498     ipcp->ns.resolv_nons = NULL;
 499   }
 500 }
 501
 502 void
 503 ipcp_SetLink(struct ipcp *ipcp, struct link *l)
 504 {
 505   ipcp->fsm.link = l;
 506 }
 507
 508 void
 509 ipcp_Setup(struct ipcp *ipcp, u_int32_t mask)
 510 {
 511   struct iface *iface = ipcp->fsm.bundle->iface;
 512   struct ncpaddr ipaddr;
 513   struct in_addr peer;
 514   int pos;
 515   unsigned n;
 516
 517   ipcp->fsm.open_mode = 0;
 518   ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask;
 519
 520   if (iplist_isvalid(&ipcp->cfg.peer_list)) {
 521     /* Try to give the peer a previously configured IP address */
 522     for (n = 0; n < iface->addrs; n++) {
 523       if (!ncpaddr_getip4(&iface->addr[n].peer, &peer))
 524         continue;
 525       if ((pos = iplist_ip2pos(&ipcp->cfg.peer_list, peer)) != -1) {
 526         ncpaddr_setip4(&ipaddr, iplist_setcurpos(&ipcp->cfg.peer_list, pos));
 527         break;
 528       }
 529     }
 530     if (n == iface->addrs)
 531       /* Ok, so none of 'em fit.... pick a random one */
 532       ncpaddr_setip4(&ipaddr, iplist_setrandpos(&ipcp->cfg.peer_list));
 533
 534     ncprange_sethost(&ipcp->cfg.peer_range, &ipaddr);
 535   }
 536
 537   ipcp->heis1172 = 0;
 538   ipcp->peer_req = 0;
 539   ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip);
 540   ipcp->peer_compproto = 0;
 541
 542   if (ipcp->cfg.HaveTriggerAddress) {
 543     /*
 544      * Some implementations of PPP require that we send a
 545      * *special* value as our address, even though the rfc specifies
 546      * full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0").
 547      */
 548     ipcp->my_ip = ipcp->cfg.TriggerAddress;
 549     log_Printf(LogIPCP, "Using trigger address %s\n",
 550               inet_ntoa(ipcp->cfg.TriggerAddress));
 551   } else {
 552     /*
 553      * Otherwise, if we've used an IP number before and it's still within
 554      * the network specified on the ``set ifaddr'' line, we really
 555      * want to keep that IP number so that we can keep any existing
 556      * connections that are bound to that IP.
 557      */
 558     for (n = 0; n < iface->addrs; n++) {
 559       ncprange_getaddr(&iface->addr[n].ifa, &ipaddr);
 560       if (ncprange_contains(&ipcp->cfg.my_range, &ipaddr)) {
 561         ncpaddr_getip4(&ipaddr, &ipcp->my_ip);
 562         break;
 563       }
 564     }
 565     if (n == iface->addrs)
 566       ncprange_getip4addr(&ipcp->cfg.my_range, &ipcp->my_ip);
 567   }
 568
 569   if (IsEnabled(ipcp->cfg.vj.neg)
 570 #ifndef NORADIUS
 571       || (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj)
 572 #endif
 573      )
 574     ipcp->my_compproto = (PROTO_VJCOMP << 16) +
 575                          ((ipcp->cfg.vj.slots - 1) << 8) +
 576                          ipcp->cfg.vj.slotcomp;
 577   else
 578     ipcp->my_compproto = 0;
 579   sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1);
 580
 581   ipcp->peer_reject = 0;
 582   ipcp->my_reject = 0;
 583
 584   /* Copy startup values into ipcp->ns.dns */
 585   if (ipcp->cfg.ns.dns[0].s_addr != INADDR_NONE)
 586     memcpy(ipcp->ns.dns, ipcp->cfg.ns.dns, sizeof ipcp->ns.dns);
 587 }
 588
 589 static int
 590 numaddresses(struct in_addr mask)
 591 {
 592   u_int32_t bit, haddr;
 593   int n;
 594
 595   haddr = ntohl(mask.s_addr);
 596   bit = 1;
 597   n = 1;
 598
 599   do {
 600     if (!(haddr & bit))
 601       n <<= 1;
 602   } while (bit <<= 1);
 603
 604   return n;
 605 }
 606
 607 static int
 608 ipcp_proxyarp(struct ipcp *ipcp,
 609               int (*proxyfun)(struct bundle *, struct in_addr),
 610               const struct iface_addr *addr)
 611 {
 612   struct bundle *bundle = ipcp->fsm.bundle;
 613   struct in_addr peer, mask, ip;
 614   int n, ret;
 615
 616   mask.s_addr = 0;      /* avoid gcc warnings */
 617
 618   if (!ncpaddr_getip4(&addr->peer, &peer)) {
 619     log_Printf(LogERROR, "Oops, ipcp_proxyarp() called with unexpected addr\n");
 620     return 0;
 621   }
 622
 623   ret = 0;
 624
 625   if (Enabled(bundle, OPT_PROXYALL)) {
 626     ncprange_getip4mask(&addr->ifa, &mask);
 627     if ((n = numaddresses(mask)) > 256) {
 628       log_Printf(LogWARN, "%s: Too many addresses for proxyall\n",
 629                  ncprange_ntoa(&addr->ifa));
 630       return 0;
 631     }
 632     ip.s_addr = peer.s_addr & mask.s_addr;
 633     if (n >= 4) {
 634       ip.s_addr = htonl(ntohl(ip.s_addr) + 1);
 635       n -= 2;
 636     }
 637     while (n) {
 638       if (!((ip.s_addr ^ peer.s_addr) & mask.s_addr)) {
 639         if (!(ret = (*proxyfun)(bundle, ip)))
 640           break;
 641         n--;
 642       }
 643       ip.s_addr = htonl(ntohl(ip.s_addr) + 1);
 644     }
 645     ret = !n;
 646   } else if (Enabled(bundle, OPT_PROXY))
 647     ret = (*proxyfun)(bundle, peer);
 648
 649   return ret;
 650 }
 651
 652 static int
 653 ipcp_SetIPaddress(struct ipcp *ipcp, struct in_addr myaddr,
 654                   struct in_addr hisaddr)
 655 {
 656   struct bundle *bundle = ipcp->fsm.bundle;
 657   struct ncpaddr myncpaddr, hisncpaddr;
 658   struct ncprange myrange;
 659   struct in_addr mask;
 660   struct sockaddr_storage ssdst, ssgw, ssmask;
 661   struct sockaddr *sadst, *sagw, *samask;
 662
 663   sadst = (struct sockaddr *)&ssdst;
 664   sagw = (struct sockaddr *)&ssgw;
 665   samask = (struct sockaddr *)&ssmask;
 666
 667   ncpaddr_setip4(&hisncpaddr, hisaddr);
 668   ncpaddr_setip4(&myncpaddr, myaddr);
 669   ncprange_sethost(&myrange, &myncpaddr);
 670
 671   mask = addr2mask(myaddr);
 672
 673   if (ipcp->ifmask.s_addr != INADDR_ANY &&
 674       (ipcp->ifmask.s_addr & mask.s_addr) == mask.s_addr)
 675     ncprange_setip4mask(&myrange, ipcp->ifmask);
 676
 677   if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &hisncpaddr,
 678                  IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM))
 679     return 0;
 680
 681   if (!Enabled(bundle, OPT_IFACEALIAS))
 682     iface_Clear(bundle->iface, &bundle->ncp, AF_INET,
 683                 IFACE_CLEAR_ALIASES|IFACE_SYSTEM);
 684
 685   if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) {
 686     ncprange_getsa(&myrange, &ssgw, &ssmask);
 687     ncpaddr_getsa(&hisncpaddr, &ssdst);
 688     rt_Update(bundle, sadst, sagw, samask);
 689   }
 690
 691   if (Enabled(bundle, OPT_SROUTES))
 692     route_Change(bundle, bundle->ncp.route, &myncpaddr, &hisncpaddr);
 693
 694 #ifndef NORADIUS
 695   if (bundle->radius.valid)
 696     route_Change(bundle, bundle->radius.routes, &myncpaddr, &hisncpaddr);
 697 #endif
 698
 699   return 1;     /* Ok */
 700 }
 701
 702 static struct in_addr
 703 ChooseHisAddr(struct bundle *bundle, struct in_addr gw)
 704 {
 705   struct in_addr try;
 706   u_long f;
 707
 708   for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) {
 709     try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list);
 710     log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n",
 711               f, inet_ntoa(try));
 712     if (ipcp_SetIPaddress(&bundle->ncp.ipcp, gw, try)) {
 713       log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try));
 714       break;
 715     }
 716   }
 717
 718   if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) {
 719     log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n");
 720     try.s_addr = INADDR_ANY;
 721   }
 722
 723   return try;
 724 }
 725
 726 static void
 727 IpcpInitRestartCounter(struct fsm *fp, int what)
 728 {
 729   /* Set fsm timer load */
 730   struct ipcp *ipcp = fsm2ipcp(fp);
 731
 732   fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS;
 733   switch (what) {
 734     case FSM_REQ_TIMER:
 735       fp->restart = ipcp->cfg.fsm.maxreq;
 736       break;
 737     case FSM_TRM_TIMER:
 738       fp->restart = ipcp->cfg.fsm.maxtrm;
 739       break;
 740     default:
 741       fp->restart = 1;
 742       break;
 743   }
 744 }
 745
 746 static void
 747 IpcpSendConfigReq(struct fsm *fp)
 748 {
 749   /* Send config REQ please */
 750   struct physical *p = link2physical(fp->link);
 751   struct ipcp *ipcp = fsm2ipcp(fp);
 752   u_char buff[24];
 753   struct fsm_opt *o;
 754
 755   o = (struct fsm_opt *)buff;
 756
 757   if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) {
 758     memcpy(o->data, &ipcp->my_ip.s_addr, 4);
 759     INC_FSM_OPT(TY_IPADDR, 6, o);
 760   }
 761
 762   if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) {
 763     if (ipcp->heis1172) {
 764       u_int16_t proto = PROTO_VJCOMP;
 765
 766       ua_htons(&proto, o->data);
 767       INC_FSM_OPT(TY_COMPPROTO, 4, o);
 768     } else {
 769       struct compreq req;
 770
 771       req.proto = htons(ipcp->my_compproto >> 16);
 772       req.slots = (ipcp->my_compproto >> 8) & 255;
 773       req.compcid = ipcp->my_compproto & 1;
 774       memcpy(o->data, &req, 4);
 775       INC_FSM_OPT(TY_COMPPROTO, 6, o);
 776     }
 777   }
 778
 779   if (IsEnabled(ipcp->cfg.ns.dns_neg)) {
 780     if (!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) {
 781       memcpy(o->data, &ipcp->ns.dns[0].s_addr, 4);
 782       INC_FSM_OPT(TY_PRIMARY_DNS, 6, o);
 783     }
 784
 785     if (!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) {
 786       memcpy(o->data, &ipcp->ns.dns[1].s_addr, 4);
 787       INC_FSM_OPT(TY_SECONDARY_DNS, 6, o);
 788     }
 789   }
 790
 791   fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff,
 792              MB_IPCPOUT);
 793 }
 794
 795 static void
 796 IpcpSentTerminateReq(struct fsm *fp __unused)
 797 {
 798   /* Term REQ just sent by FSM */
 799 }
 800
 801 static void
 802 IpcpSendTerminateAck(struct fsm *fp, u_char id)
 803 {
 804   /* Send Term ACK please */
 805   fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT);
 806 }
 807
 808 static void
 809 IpcpLayerStart(struct fsm *fp)
 810 {
 811   /* We're about to start up ! */
 812   struct ipcp *ipcp = fsm2ipcp(fp);
 813
 814   log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name);
 815   throughput_start(&ipcp->throughput, "IPCP throughput",
 816                    Enabled(fp->bundle, OPT_THROUGHPUT));
 817   fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
 818   ipcp->peer_req = 0;
 819 }
 820
 821 static void
 822 IpcpLayerFinish(struct fsm *fp)
 823 {
 824   /* We're now down */
 825   struct ipcp *ipcp = fsm2ipcp(fp);
 826
 827   log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name);
 828   throughput_stop(&ipcp->throughput);
 829   throughput_log(&ipcp->throughput, LogIPCP, NULL);
 830 }
 831
 832 /*
 833  * Called from iface_Add() via ncp_IfaceAddrAdded()
 834  */
 835 void
 836 ipcp_IfaceAddrAdded(struct ipcp *ipcp, const struct iface_addr *addr)
 837 {
 838   struct bundle *bundle = ipcp->fsm.bundle;
 839
 840   if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL))
 841     ipcp_proxyarp(ipcp, arp_SetProxy, addr);
 842 }
 843
 844 /*
 845  * Called from iface_Clear() and iface_Delete() via ncp_IfaceAddrDeleted()
 846  */
 847 void
 848 ipcp_IfaceAddrDeleted(struct ipcp *ipcp, const struct iface_addr *addr)
 849 {
 850   struct bundle *bundle = ipcp->fsm.bundle;
 851
 852   if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL))
 853     ipcp_proxyarp(ipcp, arp_ClearProxy, addr);
 854 }
 855
 856 static void
 857 IpcpLayerDown(struct fsm *fp)
 858 {
 859   /* About to come down */
 860   struct ipcp *ipcp = fsm2ipcp(fp);
 861   static int recursing;
 862   char addr[16];
 863
 864   if (!recursing++) {
 865     snprintf(addr, sizeof addr, "%s", inet_ntoa(ipcp->my_ip));
 866     log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, addr);
 867
 868 #ifndef NORADIUS
 869     radius_Account(&fp->bundle->radius, &fp->bundle->radacct,
 870                    fp->bundle->links, RAD_STOP, &ipcp->peer_ip, &ipcp->ifmask,
 871                    &ipcp->throughput);
 872
 873   if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid)
 874     system_Select(fp->bundle, fp->bundle->radius.filterid, LINKDOWNFILE,
 875                   NULL, NULL);
 876 #endif
 877
 878     /*
 879      * XXX this stuff should really live in the FSM.  Our config should
 880      * associate executable sections in files with events.
 881      */
 882     if (system_Select(fp->bundle, addr, LINKDOWNFILE, NULL, NULL) < 0) {
 883       if (bundle_GetLabel(fp->bundle)) {
 884          if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
 885                           LINKDOWNFILE, NULL, NULL) < 0)
 886          system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
 887       } else
 888         system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
 889     }
 890
 891     ipcp_Setup(ipcp, INADDR_NONE);
 892   }
 893   recursing--;
 894 }
 895
 896 int
 897 ipcp_InterfaceUp(struct ipcp *ipcp)
 898 {
 899   if (!ipcp_SetIPaddress(ipcp, ipcp->my_ip, ipcp->peer_ip)) {
 900     log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n");
 901     return 0;
 902   }
 903
 904   if (!iface_SetFlags(ipcp->fsm.bundle->iface->name, IFF_UP)) {
 905     log_Printf(LogERROR, "ipcp_InterfaceUp: Can't set the IFF_UP flag on %s\n",
 906                ipcp->fsm.bundle->iface->name);
 907     return 0;
 908   }
 909
 910 #ifndef NONAT
 911   if (ipcp->fsm.bundle->NatEnabled)
 912     PacketAliasSetAddress(ipcp->my_ip);
 913 #endif
 914
 915   return 1;
 916 }
 917
 918 static int
 919 IpcpLayerUp(struct fsm *fp)
 920 {
 921   /* We're now up */
 922   struct ipcp *ipcp = fsm2ipcp(fp);
 923   char tbuff[16];
 924
 925   log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name);
 926   snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip));
 927   log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n",
 928              tbuff, inet_ntoa(ipcp->peer_ip));
 929
 930   if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP)
 931     sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255);
 932
 933   if (!ipcp_InterfaceUp(ipcp))
 934     return 0;
 935
 936 #ifndef NORADIUS
 937   radius_Account(&fp->bundle->radius, &fp->bundle->radacct, fp->bundle->links,
 938                  RAD_START, &ipcp->peer_ip, &ipcp->ifmask, &ipcp->throughput);
 939
 940   if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid)
 941     system_Select(fp->bundle, fp->bundle->radius.filterid, LINKUPFILE,
 942                   NULL, NULL);
 943 #endif
 944
 945   /*
 946    * XXX this stuff should really live in the FSM.  Our config should
 947    * associate executable sections in files with events.
 948    */
 949   if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) {
 950     if (bundle_GetLabel(fp->bundle)) {
 951       if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
 952                        LINKUPFILE, NULL, NULL) < 0)
 953         system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
 954     } else
 955       system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
 956   }
 957
 958   fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
 959   log_DisplayPrompts();
 960
 961   return 1;
 962 }
 963
 964 static void
 965 ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec)
 966 {
 967   struct bundle *bundle = ipcp->fsm.bundle;
 968   struct iface *iface = bundle->iface;
 969   struct in_addr myaddr, peer;
 970   unsigned n;
 971
 972   if (iplist_isvalid(&ipcp->cfg.peer_list)) {
 973     ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
 974     if (ip.s_addr == INADDR_ANY ||
 975         iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 ||
 976         !ipcp_SetIPaddress(ipcp, myaddr, ip)) {
 977       log_Printf(LogIPCP, "%s: Address invalid or already in use\n",
 978                  inet_ntoa(ip));
 979       /*
 980        * If we've already had a valid address configured for the peer,
 981        * try NAKing with that so that we don't have to upset things
 982        * too much.
 983        */
 984       for (n = 0; n < iface->addrs; n++) {
 985         if (!ncpaddr_getip4(&iface->addr[n].peer, &peer))
 986           continue;
 987         if (iplist_ip2pos(&ipcp->cfg.peer_list, peer) >= 0) {
 988           ipcp->peer_ip = peer;
 989           break;
 990         }
 991       }
 992
 993       if (n == iface->addrs) {
 994         /* Just pick an IP number from our list */
 995         ipcp->peer_ip = ChooseHisAddr(bundle, myaddr);
 996       }
 997
 998       if (ipcp->peer_ip.s_addr == INADDR_ANY) {
 999         *dec->rejend++ = TY_IPADDR;
1000         *dec->rejend++ = 6;
1001         memcpy(dec->rejend, &ip.s_addr, 4);
1002         dec->rejend += 4;
1003       } else {
1004         *dec->nakend++ = TY_IPADDR;
1005         *dec->nakend++ = 6;
1006         memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
1007         dec->nakend += 4;
1008       }
1009       return;
1010     }
1011   } else if (ip.s_addr == INADDR_ANY ||
1012              !ncprange_containsip4(&ipcp->cfg.peer_range, ip)) {
1013     /*
1014      * If the destination address is not acceptable, NAK with what we
1015      * want to use.
1016      */
1017     *dec->nakend++ = TY_IPADDR;
1018     *dec->nakend++ = 6;
1019     for (n = 0; n < iface->addrs; n++)
1020       if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) {
1021         /* We prefer the already-configured address */
1022         ncpaddr_getip4addr(&iface->addr[n].peer, (u_int32_t *)dec->nakend);
1023         break;
1024       }
1025
1026     if (n == iface->addrs)
1027       memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
1028
1029     dec->nakend += 4;
1030     return;
1031   }
1032
1033   ipcp->peer_ip = ip;
1034   *dec->ackend++ = TY_IPADDR;
1035   *dec->ackend++ = 6;
1036   memcpy(dec->ackend, &ip.s_addr, 4);
1037   dec->ackend += 4;
1038 }
1039
1040 static void
1041 IpcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type,
1042                  struct fsm_decode *dec)
1043 {
1044   /* Deal with incoming PROTO_IPCP */
1045   struct ncpaddr ncpaddr;
1046   struct ipcp *ipcp = fsm2ipcp(fp);
1047   int gotdnsnak;
1048   u_int32_t compproto;
1049   struct compreq *pcomp;
1050   struct in_addr ipaddr, dstipaddr, have_ip;
1051   char tbuff[100], tbuff2[100];
1052   struct fsm_opt *opt, nak;
1053
1054   gotdnsnak = 0;
1055
1056   while (end - cp >= (int)sizeof(opt->hdr)) {
1057     if ((opt = fsm_readopt(&cp)) == NULL)
1058       break;
1059
1060     snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id),
1061              opt->hdr.len);
1062
1063     switch (opt->hdr.id) {
1064     case TY_IPADDR:             /* RFC1332 */
1065       memcpy(&ipaddr.s_addr, opt->data, 4);
1066       log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1067
1068       switch (mode_type) {
1069       case MODE_REQ:
1070         ipcp->peer_req = 1;
1071         ipcp_ValidateReq(ipcp, ipaddr, dec);
1072         break;
1073
1074       case MODE_NAK:
1075         if (ncprange_containsip4(&ipcp->cfg.my_range, ipaddr)) {
1076           /* Use address suggested by peer */
1077           snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff,
1078                    inet_ntoa(ipcp->my_ip));
1079           log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr));
1080           ipcp->my_ip = ipaddr;
1081           ncpaddr_setip4(&ncpaddr, ipcp->my_ip);
1082           bundle_AdjustFilters(fp->bundle, &ncpaddr, NULL);
1083         } else {
1084           log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE,
1085                     "%s: Unacceptable address!\n", inet_ntoa(ipaddr));
1086           fsm_Close(&ipcp->fsm);
1087         }
1088         break;
1089
1090       case MODE_REJ:
1091         ipcp->peer_reject |= (1 << opt->hdr.id);
1092         break;
1093       }
1094       break;
1095
1096     case TY_COMPPROTO:
1097       pcomp = (struct compreq *)opt->data;
1098       compproto = (ntohs(pcomp->proto) << 16) + ((int)pcomp->slots << 8) +
1099                   pcomp->compcid;
1100       log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto));
1101
1102       switch (mode_type) {
1103       case MODE_REQ:
1104         if (!IsAccepted(ipcp->cfg.vj.neg))
1105           fsm_rej(dec, opt);
1106         else {
1107           switch (opt->hdr.len) {
1108           case 4:               /* RFC1172 */
1109             if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
1110               log_Printf(LogWARN, "Peer is speaking RFC1172 compression "
1111                          "protocol !\n");
1112               ipcp->heis1172 = 1;
1113               ipcp->peer_compproto = compproto;
1114               fsm_ack(dec, opt);
1115             } else {
1116               pcomp->proto = htons(PROTO_VJCOMP);
1117               nak.hdr.id = TY_COMPPROTO;
1118               nak.hdr.len = 4;
1119               memcpy(nak.data, &pcomp, 2);
1120               fsm_nak(dec, &nak);
1121             }
1122             break;
1123           case 6:               /* RFC1332 */
1124             if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
1125               /* We know pcomp->slots' max value == MAX_VJ_STATES */
1126               if (pcomp->slots >= MIN_VJ_STATES) {
1127                 /* Ok, we can do that */
1128                 ipcp->peer_compproto = compproto;
1129                 ipcp->heis1172 = 0;
1130                 fsm_ack(dec, opt);
1131               } else {
1132                 /* Get as close as we can to what he wants */
1133                 ipcp->heis1172 = 0;
1134                 pcomp->slots = MIN_VJ_STATES;
1135                 nak.hdr.id = TY_COMPPROTO;
1136                 nak.hdr.len = 4;
1137                 memcpy(nak.data, &pcomp, 2);
1138                 fsm_nak(dec, &nak);
1139               }
1140             } else {
1141               /* What we really want */
1142               pcomp->proto = htons(PROTO_VJCOMP);
1143               pcomp->slots = DEF_VJ_STATES;
1144               pcomp->compcid = 1;
1145               nak.hdr.id = TY_COMPPROTO;
1146               nak.hdr.len = 6;
1147               memcpy(nak.data, &pcomp, sizeof pcomp);
1148               fsm_nak(dec, &nak);
1149             }
1150             break;
1151           default:
1152             fsm_rej(dec, opt);
1153             break;
1154           }
1155         }
1156         break;
1157
1158       case MODE_NAK:
1159         if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
1160           /* We know pcomp->slots' max value == MAX_VJ_STATES */
1161           if (pcomp->slots < MIN_VJ_STATES)
1162             pcomp->slots = MIN_VJ_STATES;
1163           compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) +
1164                       pcomp->compcid;
1165         } else
1166           compproto = 0;
1167         log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n",
1168                    tbuff, ipcp->my_compproto, compproto);
1169         ipcp->my_compproto = compproto;
1170         break;
1171
1172       case MODE_REJ:
1173         ipcp->peer_reject |= (1 << opt->hdr.id);
1174         break;
1175       }
1176       break;
1177
1178     case TY_IPADDRS:            /* RFC1172 */
1179       memcpy(&ipaddr.s_addr, opt->data, 4);
1180       memcpy(&dstipaddr.s_addr, opt->data + 4, 4);
1181       snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr));
1182       log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr));
1183
1184       switch (mode_type) {
1185       case MODE_REQ:
1186         fsm_rej(dec, opt);
1187         break;
1188
1189       case MODE_NAK:
1190       case MODE_REJ:
1191         break;
1192       }
1193       break;
1194
1195     case TY_PRIMARY_DNS:        /* DNS negotiation (rfc1877) */
1196     case TY_SECONDARY_DNS:
1197       memcpy(&ipaddr.s_addr, opt->data, 4);
1198       log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1199
1200       switch (mode_type) {
1201       case MODE_REQ:
1202         if (!IsAccepted(ipcp->cfg.ns.dns_neg)) {
1203           ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1204           fsm_rej(dec, opt);
1205           break;
1206         }
1207         have_ip = ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1];
1208
1209         if (opt->hdr.id == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr &&
1210             ipaddr.s_addr == ipcp->ns.dns[1].s_addr) {
1211           /* Swap 'em 'round */
1212           ipcp->ns.dns[0] = ipcp->ns.dns[1];
1213           ipcp->ns.dns[1] = have_ip;
1214           have_ip = ipcp->ns.dns[0];
1215         }
1216
1217         if (ipaddr.s_addr != have_ip.s_addr) {
1218           /*
1219            * The client has got the DNS stuff wrong (first request) so
1220            * we'll tell 'em how it is
1221            */
1222           nak.hdr.id = opt->hdr.id;
1223           nak.hdr.len = 6;
1224           memcpy(nak.data, &have_ip.s_addr, 4);
1225           fsm_nak(dec, &nak);
1226         } else {
1227           /*
1228            * Otherwise they have it right (this time) so we send a ack packet
1229            * back confirming it... end of story
1230            */
1231           fsm_ack(dec, opt);
1232         }
1233         break;
1234
1235       case MODE_NAK:
1236         if (IsEnabled(ipcp->cfg.ns.dns_neg)) {
1237           gotdnsnak = 1;
1238           memcpy(&ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1].s_addr,
1239                  opt->data, 4);
1240         }
1241         break;
1242
1243       case MODE_REJ:            /* Can't do much, stop asking */
1244         ipcp->peer_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1245         break;
1246       }
1247       break;
1248
1249     case TY_PRIMARY_NBNS:       /* M$ NetBIOS nameserver hack (rfc1877) */
1250     case TY_SECONDARY_NBNS:
1251       memcpy(&ipaddr.s_addr, opt->data, 4);
1252       log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1253
1254       switch (mode_type) {
1255       case MODE_REQ:
1256         have_ip.s_addr =
1257           ipcp->cfg.ns.nbns[opt->hdr.id == TY_PRIMARY_NBNS ? 0 : 1].s_addr;
1258
1259         if (have_ip.s_addr == INADDR_ANY) {
1260           log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n");
1261           ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1262           fsm_rej(dec, opt);
1263           break;
1264         }
1265
1266         if (ipaddr.s_addr != have_ip.s_addr) {
1267           nak.hdr.id = opt->hdr.id;
1268           nak.hdr.len = 6;
1269           memcpy(nak.data, &have_ip.s_addr, 4);
1270           fsm_nak(dec, &nak);
1271         } else
1272           fsm_ack(dec, opt);
1273         break;
1274
1275       case MODE_NAK:
1276         log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", opt->hdr.id);
1277         break;
1278
1279       case MODE_REJ:
1280         log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", opt->hdr.id);
1281         break;
1282       }
1283       break;
1284
1285     default:
1286       if (mode_type != MODE_NOP) {
1287         ipcp->my_reject |= (1 << opt->hdr.id);
1288         fsm_rej(dec, opt);
1289       }
1290       break;
1291     }
1292   }
1293
1294   if (gotdnsnak) {
1295     if (ipcp->ns.writable) {
1296       log_Printf(LogDEBUG, "Updating resolver\n");
1297       if (!ipcp_WriteDNS(ipcp)) {
1298         ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS));
1299         ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS));
1300       } else
1301         bundle_AdjustDNS(fp->bundle);
1302     } else {
1303       log_Printf(LogDEBUG, "Not updating resolver (readonly)\n");
1304       bundle_AdjustDNS(fp->bundle);
1305     }
1306   }
1307
1308   if (mode_type != MODE_NOP) {
1309     if (mode_type == MODE_REQ && !ipcp->peer_req) {
1310       if (dec->rejend == dec->rej && dec->nakend == dec->nak) {
1311         /*
1312          * Pretend the peer has requested an IP.
1313          * We do this to ensure that we only send one NAK if the only
1314          * reason for the NAK is because the peer isn't sending a
1315          * TY_IPADDR REQ.  This stops us from repeatedly trying to tell
1316          * the peer that we have to have an IP address on their end.
1317          */
1318         ipcp->peer_req = 1;
1319       }
1320       ipaddr.s_addr = INADDR_ANY;
1321       ipcp_ValidateReq(ipcp, ipaddr, dec);
1322     }
1323     fsm_opt_normalise(dec);
1324   }
1325 }
1326
1327 extern struct mbuf *
1328 ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
1329 {
1330   /* Got PROTO_IPCP from link */
1331   m_settype(bp, MB_IPCPIN);
1332   if (bundle_Phase(bundle) == PHASE_NETWORK)
1333     fsm_Input(&bundle->ncp.ipcp.fsm, bp);
1334   else {
1335     if (bundle_Phase(bundle) < PHASE_NETWORK)
1336       log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n",
1337                  l->name, bundle_PhaseName(bundle));
1338     m_freem(bp);
1339   }
1340   return NULL;
1341 }
1342
1343 int
1344 ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr)
1345 {
1346   struct ipcp *ipcp = &bundle->ncp.ipcp;
1347   struct in_addr myaddr;
1348
1349   memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
1350   iplist_reset(&ipcp->cfg.peer_list);
1351   ipcp->peer_ip = hisaddr;
1352   ncprange_setip4host(&ipcp->cfg.peer_range, hisaddr);
1353   ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
1354
1355   return ipcp_SetIPaddress(ipcp, myaddr, hisaddr);
1356 }
1357
1358 int
1359 ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr)
1360 {
1361   struct in_addr myaddr;
1362   struct ncp *ncp = &bundle->ncp;
1363   struct ipcp *ipcp = &ncp->ipcp;
1364   struct ncpaddr ncpaddr;
1365
1366   /* Use `hisaddr' for the peers address (set iface if `setaddr') */
1367   memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
1368   iplist_reset(&ipcp->cfg.peer_list);
1369   if (strpbrk(hisaddr, ",-")) {
1370     iplist_setsrc(&ipcp->cfg.peer_list, hisaddr);
1371     if (iplist_isvalid(&ipcp->cfg.peer_list)) {
1372       iplist_setrandpos(&ipcp->cfg.peer_list);
1373       ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip);
1374       if (ipcp->peer_ip.s_addr == INADDR_ANY) {
1375         log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src);
1376         return 0;
1377       }
1378       ncprange_setip4host(&ipcp->cfg.peer_range, ipcp->peer_ip);
1379     } else {
1380       log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr);
1381       return 0;
1382     }
1383   } else if (ncprange_aton(&ipcp->cfg.peer_range, ncp, hisaddr) != 0) {
1384     if (ncprange_family(&ipcp->cfg.my_range) != AF_INET) {
1385       log_Printf(LogWARN, "%s: Not an AF_INET address !\n", hisaddr);
1386       return 0;
1387     }
1388     ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
1389     ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip);
1390
1391     if (setaddr && !ipcp_SetIPaddress(ipcp, myaddr, ipcp->peer_ip))
1392       return 0;
1393   } else
1394     return 0;
1395
1396   ncpaddr_setip4(&ncpaddr, ipcp->peer_ip);
1397   bundle_AdjustFilters(bundle, NULL, &ncpaddr);
1398
1399   return 1;     /* Ok */
1400 }
1401
1402 struct in_addr
1403 addr2mask(struct in_addr addr)
1404 {
1405   u_int32_t haddr = ntohl(addr.s_addr);
1406
1407   haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET :
1408           IN_CLASSB(haddr) ? IN_CLASSB_NET :
1409           IN_CLASSC_NET;
1410   addr.s_addr = htonl(haddr);
1411
1412   return addr;
1413 }
1414
1415 size_t
1416 ipcp_QueueLen(struct ipcp *ipcp)
1417 {
1418   struct mqueue *q;
1419   size_t result;
1420
1421   result = 0;
1422   for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++)
1423     result += q->len;
1424
1425   return result;
1426 }
1427
1428 int
1429 ipcp_PushPacket(struct ipcp *ipcp, struct link *l)
1430 {
1431   struct bundle *bundle = ipcp->fsm.bundle;
1432   struct mqueue *queue;
1433   struct mbuf *bp;
1434   int m_len;
1435   u_int32_t secs = 0;
1436   unsigned alivesecs = 0;
1437
1438   if (ipcp->fsm.state != ST_OPENED)
1439     return 0;
1440
1441   /*
1442    * If ccp is not open but is required, do nothing.
1443    */
1444   if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) {
1445     log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name);
1446     return 0;
1447   }
1448
1449   queue = ipcp->Queue + IPCP_QUEUES(ipcp) - 1;
1450   do {
1451     if (queue->top) {
1452       bp = m_dequeue(queue);
1453       bp = mbuf_Read(bp, &secs, sizeof secs);
1454       bp = m_pullup(bp);
1455       m_len = m_length(bp);
1456       if (!FilterCheck(MBUF_CTOP(bp), AF_INET, &bundle->filter.alive,
1457                        &alivesecs)) {
1458         if (secs == 0)
1459           secs = alivesecs;
1460         bundle_StartIdleTimer(bundle, secs);
1461       }
1462       link_PushPacket(l, bp, bundle, 0, PROTO_IP);
1463       ipcp_AddOutOctets(ipcp, m_len);
1464       return 1;
1465     }
1466   } while (queue-- != ipcp->Queue);
1467
1468   return 0;
1469 }