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   int 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;
 324     size_t len;
 325     int fd;
 326
 327     if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_TRUNC, 0644)) != -1) {
 328       len = strlen(ipcp->ns.resolv);
 329       if ((got = write(fd, ipcp->ns.resolv, len)) != len) {
 330         if (got == -1)
 331           log_Printf(LogERROR, "Failed rewriting %s: write: %s\n",
 332                      _PATH_RESCONF, strerror(errno));
 333         else
 334           log_Printf(LogERROR, "Failed rewriting %s: wrote %lu of %lu\n",
 335                      _PATH_RESCONF, (unsigned long)got, (unsigned long)len);
 336       }
 337       close(fd);
 338     } else
 339       log_Printf(LogERROR, "Failed rewriting %s: open: %s\n", _PATH_RESCONF,
 340                  strerror(errno));
 341   } else if (remove(_PATH_RESCONF) == -1)
 342     log_Printf(LogERROR, "Failed removing %s: %s\n", _PATH_RESCONF,
 343                strerror(errno));
 344
 345 }
 346
 347 int
 348 ipcp_Show(struct cmdargs const *arg)
 349 {
 350   struct ipcp *ipcp = &arg->bundle->ncp.ipcp;
 351
 352   prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name,
 353                 State2Nam(ipcp->fsm.state));
 354   if (ipcp->fsm.state == ST_OPENED) {
 355     prompt_Printf(arg->prompt, " His side:        %s, %s\n",
 356                   inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto));
 357     prompt_Printf(arg->prompt, " My side:         %s, %s\n",
 358                   inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto));
 359     prompt_Printf(arg->prompt, " Queued packets:  %lu\n",
 360                   (unsigned long)ipcp_QueueLen(ipcp));
 361   }
 362
 363   prompt_Printf(arg->prompt, "\nDefaults:\n");
 364   prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config"
 365                 " REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout,
 366                 ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s",
 367                 ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s");
 368   prompt_Printf(arg->prompt, " My Address:      %s\n",
 369                 ncprange_ntoa(&ipcp->cfg.my_range));
 370   if (ipcp->cfg.HaveTriggerAddress)
 371     prompt_Printf(arg->prompt, " Trigger address: %s\n",
 372                   inet_ntoa(ipcp->cfg.TriggerAddress));
 373
 374   prompt_Printf(arg->prompt, " VJ compression:  %s (%d slots %s slot "
 375                 "compression)\n", command_ShowNegval(ipcp->cfg.vj.neg),
 376                 ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without");
 377
 378   if (iplist_isvalid(&ipcp->cfg.peer_list))
 379     prompt_Printf(arg->prompt, " His Address:     %s\n",
 380                   ipcp->cfg.peer_list.src);
 381   else
 382     prompt_Printf(arg->prompt, " His Address:     %s\n",
 383                   ncprange_ntoa(&ipcp->cfg.peer_range));
 384
 385   prompt_Printf(arg->prompt, " DNS:             %s",
 386                 ipcp->cfg.ns.dns[0].s_addr == INADDR_NONE ?
 387                 "none" : inet_ntoa(ipcp->cfg.ns.dns[0]));
 388   if (ipcp->cfg.ns.dns[1].s_addr != INADDR_NONE)
 389     prompt_Printf(arg->prompt, ", %s",
 390                   inet_ntoa(ipcp->cfg.ns.dns[1]));
 391   prompt_Printf(arg->prompt, ", %s\n",
 392                 command_ShowNegval(ipcp->cfg.ns.dns_neg));
 393   prompt_Printf(arg->prompt, " Resolver DNS:    %s",
 394                 ipcp->ns.dns[0].s_addr == INADDR_NONE ?
 395                 "none" : inet_ntoa(ipcp->ns.dns[0]));
 396   if (ipcp->ns.dns[1].s_addr != INADDR_NONE &&
 397       ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr)
 398     prompt_Printf(arg->prompt, ", %s",
 399                   inet_ntoa(ipcp->ns.dns[1]));
 400   prompt_Printf(arg->prompt, "\n NetBIOS NS:      %s, ",
 401                 inet_ntoa(ipcp->cfg.ns.nbns[0]));
 402   prompt_Printf(arg->prompt, "%s\n\n",
 403                 inet_ntoa(ipcp->cfg.ns.nbns[1]));
 404
 405   throughput_disp(&ipcp->throughput, arg->prompt);
 406
 407   return 0;
 408 }
 409
 410 int
 411 ipcp_vjset(struct cmdargs const *arg)
 412 {
 413   if (arg->argc != arg->argn+2)
 414     return -1;
 415   if (!strcasecmp(arg->argv[arg->argn], "slots")) {
 416     int slots;
 417
 418     slots = atoi(arg->argv[arg->argn+1]);
 419     if (slots < 4 || slots > 16)
 420       return 1;
 421     arg->bundle->ncp.ipcp.cfg.vj.slots = slots;
 422     return 0;
 423   } else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) {
 424     if (!strcasecmp(arg->argv[arg->argn+1], "on"))
 425       arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1;
 426     else if (!strcasecmp(arg->argv[arg->argn+1], "off"))
 427       arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0;
 428     else
 429       return 2;
 430     return 0;
 431   }
 432   return -1;
 433 }
 434
 435 void
 436 ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l,
 437           const struct fsm_parent *parent)
 438 {
 439   struct hostent *hp;
 440   struct in_addr host;
 441   char name[MAXHOSTNAMELEN];
 442   static const char * const timer_names[] =
 443     {"IPCP restart", "IPCP openmode", "IPCP stopped"};
 444
 445   fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP,
 446            bundle, l, parent, &ipcp_Callbacks, timer_names);
 447
 448   ipcp->cfg.vj.slots = DEF_VJ_STATES;
 449   ipcp->cfg.vj.slotcomp = 1;
 450   memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range);
 451
 452   host.s_addr = htonl(INADDR_LOOPBACK);
 453   ipcp->cfg.netmask.s_addr = INADDR_ANY;
 454   if (gethostname(name, sizeof name) == 0) {
 455     hp = gethostbyname(name);
 456     if (hp && hp->h_addrtype == AF_INET && hp->h_length == sizeof host.s_addr)
 457       memcpy(&host.s_addr, hp->h_addr, sizeof host.s_addr);
 458   }
 459   ncprange_setip4(&ipcp->cfg.my_range, host, ipcp->cfg.netmask);
 460   ncprange_setip4(&ipcp->cfg.peer_range, ipcp->cfg.netmask, ipcp->cfg.netmask);
 461
 462   iplist_setsrc(&ipcp->cfg.peer_list, "");
 463   ipcp->cfg.HaveTriggerAddress = 0;
 464
 465   ipcp->cfg.ns.dns[0].s_addr = INADDR_NONE;
 466   ipcp->cfg.ns.dns[1].s_addr = INADDR_NONE;
 467   ipcp->cfg.ns.dns_neg = 0;
 468   ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY;
 469   ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY;
 470
 471   ipcp->cfg.fsm.timeout = DEF_FSMRETRY;
 472   ipcp->cfg.fsm.maxreq = DEF_FSMTRIES;
 473   ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES;
 474   ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED;
 475
 476   memset(&ipcp->vj, '\0', sizeof ipcp->vj);
 477
 478   ipcp->ns.resolv = NULL;
 479   ipcp->ns.resolv_nons = NULL;
 480   ipcp->ns.writable = 1;
 481   ipcp_LoadDNS(ipcp);
 482
 483   throughput_init(&ipcp->throughput, SAMPLE_PERIOD);
 484   memset(ipcp->Queue, '\0', sizeof ipcp->Queue);
 485   ipcp_Setup(ipcp, INADDR_NONE);
 486 }
 487
 488 void
 489 ipcp_Destroy(struct ipcp *ipcp)
 490 {
 491   throughput_destroy(&ipcp->throughput);
 492
 493   if (ipcp->ns.resolv != NULL) {
 494     free(ipcp->ns.resolv);
 495     ipcp->ns.resolv = NULL;
 496   }
 497   if (ipcp->ns.resolv_nons != NULL) {
 498     free(ipcp->ns.resolv_nons);
 499     ipcp->ns.resolv_nons = NULL;
 500   }
 501 }
 502
 503 void
 504 ipcp_SetLink(struct ipcp *ipcp, struct link *l)
 505 {
 506   ipcp->fsm.link = l;
 507 }
 508
 509 void
 510 ipcp_Setup(struct ipcp *ipcp, u_int32_t mask)
 511 {
 512   struct iface *iface = ipcp->fsm.bundle->iface;
 513   struct ncpaddr ipaddr;
 514   struct in_addr peer;
 515   int pos, 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, int),
 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, s;
 615
 616   if (!ncpaddr_getip4(&addr->peer, &peer)) {
 617     log_Printf(LogERROR, "Oops, ipcp_proxyarp() called with unexpected addr\n");
 618     return 0;
 619   }
 620
 621   if ((s = ID0socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
 622     log_Printf(LogERROR, "ipcp_proxyarp: socket: %s\n",
 623                strerror(errno));
 624     return 0;
 625   }
 626
 627   ret = 0;
 628
 629   if (Enabled(bundle, OPT_PROXYALL)) {
 630     ncprange_getip4mask(&addr->ifa, &mask);
 631     if ((n = numaddresses(mask)) > 256) {
 632       log_Printf(LogWARN, "%s: Too many addresses for proxyall\n",
 633                  ncprange_ntoa(&addr->ifa));
 634       return 0;
 635     }
 636     ip.s_addr = peer.s_addr & mask.s_addr;
 637     if (n >= 4) {
 638       ip.s_addr = htonl(ntohl(ip.s_addr) + 1);
 639       n -= 2;
 640     }
 641     while (n) {
 642       if (!((ip.s_addr ^ peer.s_addr) & mask.s_addr)) {
 643         if (!(ret = (*proxyfun)(bundle, ip, s)))
 644           break;
 645         n--;
 646       }
 647       ip.s_addr = htonl(ntohl(ip.s_addr) + 1);
 648     }
 649     ret = !n;
 650   } else if (Enabled(bundle, OPT_PROXY))
 651     ret = (*proxyfun)(bundle, peer, s);
 652
 653   close(s);
 654
 655   return ret;
 656 }
 657
 658 static int
 659 ipcp_SetIPaddress(struct ipcp *ipcp, struct in_addr myaddr,
 660                   struct in_addr hisaddr)
 661 {
 662   struct bundle *bundle = ipcp->fsm.bundle;
 663   struct ncpaddr myncpaddr, hisncpaddr;
 664   struct ncprange myrange;
 665   struct in_addr mask;
 666   struct sockaddr_storage ssdst, ssgw, ssmask;
 667   struct sockaddr *sadst, *sagw, *samask;
 668
 669   sadst = (struct sockaddr *)&ssdst;
 670   sagw = (struct sockaddr *)&ssgw;
 671   samask = (struct sockaddr *)&ssmask;
 672
 673   ncpaddr_setip4(&hisncpaddr, hisaddr);
 674   ncpaddr_setip4(&myncpaddr, myaddr);
 675   ncprange_sethost(&myrange, &myncpaddr);
 676
 677   mask = addr2mask(myaddr);
 678
 679   if (ipcp->ifmask.s_addr != INADDR_ANY &&
 680       (ipcp->ifmask.s_addr & mask.s_addr) == mask.s_addr)
 681     ncprange_setip4mask(&myrange, ipcp->ifmask);
 682
 683   if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &hisncpaddr,
 684                  IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM))
 685     return 0;
 686
 687   if (!Enabled(bundle, OPT_IFACEALIAS))
 688     iface_Clear(bundle->iface, &bundle->ncp, AF_INET,
 689                 IFACE_CLEAR_ALIASES|IFACE_SYSTEM);
 690
 691   if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) {
 692     ncprange_getsa(&myrange, &ssgw, &ssmask);
 693     ncpaddr_getsa(&hisncpaddr, &ssdst);
 694     rt_Update(bundle, sadst, sagw, samask);
 695   }
 696
 697   if (Enabled(bundle, OPT_SROUTES))
 698     route_Change(bundle, bundle->ncp.route, &myncpaddr, &hisncpaddr);
 699
 700 #ifndef NORADIUS
 701   if (bundle->radius.valid)
 702     route_Change(bundle, bundle->radius.routes, &myncpaddr, &hisncpaddr);
 703 #endif
 704
 705   return 1;     /* Ok */
 706 }
 707
 708 static struct in_addr
 709 ChooseHisAddr(struct bundle *bundle, struct in_addr gw)
 710 {
 711   struct in_addr try;
 712   u_long f;
 713
 714   for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) {
 715     try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list);
 716     log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n",
 717               f, inet_ntoa(try));
 718     if (ipcp_SetIPaddress(&bundle->ncp.ipcp, gw, try)) {
 719       log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try));
 720       break;
 721     }
 722   }
 723
 724   if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) {
 725     log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n");
 726     try.s_addr = INADDR_ANY;
 727   }
 728
 729   return try;
 730 }
 731
 732 static void
 733 IpcpInitRestartCounter(struct fsm *fp, int what)
 734 {
 735   /* Set fsm timer load */
 736   struct ipcp *ipcp = fsm2ipcp(fp);
 737
 738   fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS;
 739   switch (what) {
 740     case FSM_REQ_TIMER:
 741       fp->restart = ipcp->cfg.fsm.maxreq;
 742       break;
 743     case FSM_TRM_TIMER:
 744       fp->restart = ipcp->cfg.fsm.maxtrm;
 745       break;
 746     default:
 747       fp->restart = 1;
 748       break;
 749   }
 750 }
 751
 752 static void
 753 IpcpSendConfigReq(struct fsm *fp)
 754 {
 755   /* Send config REQ please */
 756   struct physical *p = link2physical(fp->link);
 757   struct ipcp *ipcp = fsm2ipcp(fp);
 758   u_char buff[24];
 759   struct fsm_opt *o;
 760
 761   o = (struct fsm_opt *)buff;
 762
 763   if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) {
 764     memcpy(o->data, &ipcp->my_ip.s_addr, 4);
 765     INC_FSM_OPT(TY_IPADDR, 6, o);
 766   }
 767
 768   if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) {
 769     if (ipcp->heis1172) {
 770       u_int16_t proto = PROTO_VJCOMP;
 771
 772       ua_htons(&proto, o->data);
 773       INC_FSM_OPT(TY_COMPPROTO, 4, o);
 774     } else {
 775       struct compreq req;
 776
 777       req.proto = htons(ipcp->my_compproto >> 16);
 778       req.slots = (ipcp->my_compproto >> 8) & 255;
 779       req.compcid = ipcp->my_compproto & 1;
 780       memcpy(o->data, &req, 4);
 781       INC_FSM_OPT(TY_COMPPROTO, 6, o);
 782     }
 783   }
 784
 785   if (IsEnabled(ipcp->cfg.ns.dns_neg)) {
 786     if (!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) {
 787       memcpy(o->data, &ipcp->ns.dns[0].s_addr, 4);
 788       INC_FSM_OPT(TY_PRIMARY_DNS, 6, o);
 789     }
 790
 791     if (!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) {
 792       memcpy(o->data, &ipcp->ns.dns[1].s_addr, 4);
 793       INC_FSM_OPT(TY_SECONDARY_DNS, 6, o);
 794     }
 795   }
 796
 797   fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff,
 798              MB_IPCPOUT);
 799 }
 800
 801 static void
 802 IpcpSentTerminateReq(struct fsm *fp)
 803 {
 804   /* Term REQ just sent by FSM */
 805 }
 806
 807 static void
 808 IpcpSendTerminateAck(struct fsm *fp, u_char id)
 809 {
 810   /* Send Term ACK please */
 811   fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT);
 812 }
 813
 814 static void
 815 IpcpLayerStart(struct fsm *fp)
 816 {
 817   /* We're about to start up ! */
 818   struct ipcp *ipcp = fsm2ipcp(fp);
 819
 820   log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name);
 821   throughput_start(&ipcp->throughput, "IPCP throughput",
 822                    Enabled(fp->bundle, OPT_THROUGHPUT));
 823   fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
 824   ipcp->peer_req = 0;
 825 }
 826
 827 static void
 828 IpcpLayerFinish(struct fsm *fp)
 829 {
 830   /* We're now down */
 831   struct ipcp *ipcp = fsm2ipcp(fp);
 832
 833   log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name);
 834   throughput_stop(&ipcp->throughput);
 835   throughput_log(&ipcp->throughput, LogIPCP, NULL);
 836 }
 837
 838 /*
 839  * Called from iface_Add() via ncp_IfaceAddrAdded()
 840  */
 841 void
 842 ipcp_IfaceAddrAdded(struct ipcp *ipcp, const struct iface_addr *addr)
 843 {
 844   struct bundle *bundle = ipcp->fsm.bundle;
 845
 846   if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL))
 847     ipcp_proxyarp(ipcp, arp_SetProxy, addr);
 848 }
 849
 850 /*
 851  * Called from iface_Clear() and iface_Delete() via ncp_IfaceAddrDeleted()
 852  */
 853 void
 854 ipcp_IfaceAddrDeleted(struct ipcp *ipcp, const struct iface_addr *addr)
 855 {
 856   struct bundle *bundle = ipcp->fsm.bundle;
 857
 858   if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL))
 859     ipcp_proxyarp(ipcp, arp_ClearProxy, addr);
 860 }
 861
 862 static void
 863 IpcpLayerDown(struct fsm *fp)
 864 {
 865   /* About to come down */
 866   struct ipcp *ipcp = fsm2ipcp(fp);
 867   static int recursing;
 868   char addr[16];
 869
 870   if (!recursing++) {
 871     snprintf(addr, sizeof addr, "%s", inet_ntoa(ipcp->my_ip));
 872     log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, addr);
 873
 874 #ifndef NORADIUS
 875     radius_Account(&fp->bundle->radius, &fp->bundle->radacct,
 876                    fp->bundle->links, RAD_STOP, &ipcp->peer_ip, &ipcp->ifmask,
 877                    &ipcp->throughput);
 878
 879   if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid)
 880     system_Select(fp->bundle, fp->bundle->radius.filterid, LINKDOWNFILE,
 881                   NULL, NULL);
 882 #endif
 883
 884     /*
 885      * XXX this stuff should really live in the FSM.  Our config should
 886      * associate executable sections in files with events.
 887      */
 888     if (system_Select(fp->bundle, addr, LINKDOWNFILE, NULL, NULL) < 0) {
 889       if (bundle_GetLabel(fp->bundle)) {
 890          if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
 891                           LINKDOWNFILE, NULL, NULL) < 0)
 892          system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
 893       } else
 894         system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
 895     }
 896
 897     ipcp_Setup(ipcp, INADDR_NONE);
 898   }
 899   recursing--;
 900 }
 901
 902 int
 903 ipcp_InterfaceUp(struct ipcp *ipcp)
 904 {
 905   if (!ipcp_SetIPaddress(ipcp, ipcp->my_ip, ipcp->peer_ip)) {
 906     log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n");
 907     return 0;
 908   }
 909
 910   if (!iface_SetFlags(ipcp->fsm.bundle->iface->name, IFF_UP)) {
 911     log_Printf(LogERROR, "ipcp_InterfaceUp: Can't set the IFF_UP flag on %s\n",
 912                ipcp->fsm.bundle->iface->name);
 913     return 0;
 914   }
 915
 916 #ifndef NONAT
 917   if (ipcp->fsm.bundle->NatEnabled)
 918     PacketAliasSetAddress(ipcp->my_ip);
 919 #endif
 920
 921   return 1;
 922 }
 923
 924 static int
 925 IpcpLayerUp(struct fsm *fp)
 926 {
 927   /* We're now up */
 928   struct ipcp *ipcp = fsm2ipcp(fp);
 929   char tbuff[16];
 930
 931   log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name);
 932   snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip));
 933   log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n",
 934              tbuff, inet_ntoa(ipcp->peer_ip));
 935
 936   if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP)
 937     sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255);
 938
 939   if (!ipcp_InterfaceUp(ipcp))
 940     return 0;
 941
 942 #ifndef NORADIUS
 943   radius_Account(&fp->bundle->radius, &fp->bundle->radacct, fp->bundle->links,
 944                  RAD_START, &ipcp->peer_ip, &ipcp->ifmask, &ipcp->throughput);
 945
 946   if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid)
 947     system_Select(fp->bundle, fp->bundle->radius.filterid, LINKUPFILE,
 948                   NULL, NULL);
 949 #endif
 950
 951   /*
 952    * XXX this stuff should really live in the FSM.  Our config should
 953    * associate executable sections in files with events.
 954    */
 955   if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) {
 956     if (bundle_GetLabel(fp->bundle)) {
 957       if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
 958                        LINKUPFILE, NULL, NULL) < 0)
 959         system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
 960     } else
 961       system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
 962   }
 963
 964   fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
 965   log_DisplayPrompts();
 966
 967   return 1;
 968 }
 969
 970 static void
 971 ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec)
 972 {
 973   struct bundle *bundle = ipcp->fsm.bundle;
 974   struct iface *iface = bundle->iface;
 975   struct in_addr myaddr, peer;
 976   int n;
 977
 978   if (iplist_isvalid(&ipcp->cfg.peer_list)) {
 979     ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
 980     if (ip.s_addr == INADDR_ANY ||
 981         iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 ||
 982         !ipcp_SetIPaddress(ipcp, myaddr, ip)) {
 983       log_Printf(LogIPCP, "%s: Address invalid or already in use\n",
 984                  inet_ntoa(ip));
 985       /*
 986        * If we've already had a valid address configured for the peer,
 987        * try NAKing with that so that we don't have to upset things
 988        * too much.
 989        */
 990       for (n = 0; n < iface->addrs; n++) {
 991         if (!ncpaddr_getip4(&iface->addr[n].peer, &peer))
 992           continue;
 993         if (iplist_ip2pos(&ipcp->cfg.peer_list, peer) >= 0) {
 994           ipcp->peer_ip = peer;
 995           break;
 996         }
 997       }
 998
 999       if (n == iface->addrs) {
1000         /* Just pick an IP number from our list */
1001         ipcp->peer_ip = ChooseHisAddr(bundle, myaddr);
1002       }
1003
1004       if (ipcp->peer_ip.s_addr == INADDR_ANY) {
1005         *dec->rejend++ = TY_IPADDR;
1006         *dec->rejend++ = 6;
1007         memcpy(dec->rejend, &ip.s_addr, 4);
1008         dec->rejend += 4;
1009       } else {
1010         *dec->nakend++ = TY_IPADDR;
1011         *dec->nakend++ = 6;
1012         memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
1013         dec->nakend += 4;
1014       }
1015       return;
1016     }
1017   } else if (ip.s_addr == INADDR_ANY ||
1018              !ncprange_containsip4(&ipcp->cfg.peer_range, ip)) {
1019     /*
1020      * If the destination address is not acceptable, NAK with what we
1021      * want to use.
1022      */
1023     *dec->nakend++ = TY_IPADDR;
1024     *dec->nakend++ = 6;
1025     for (n = 0; n < iface->addrs; n++)
1026       if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) {
1027         /* We prefer the already-configured address */
1028         ncpaddr_getip4addr(&iface->addr[n].peer, (u_int32_t *)dec->nakend);
1029         break;
1030       }
1031
1032     if (n == iface->addrs)
1033       memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
1034
1035     dec->nakend += 4;
1036     return;
1037   }
1038
1039   ipcp->peer_ip = ip;
1040   *dec->ackend++ = TY_IPADDR;
1041   *dec->ackend++ = 6;
1042   memcpy(dec->ackend, &ip.s_addr, 4);
1043   dec->ackend += 4;
1044 }
1045
1046 static void
1047 IpcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type,
1048                  struct fsm_decode *dec)
1049 {
1050   /* Deal with incoming PROTO_IPCP */
1051   struct ncpaddr ncpaddr;
1052   struct ipcp *ipcp = fsm2ipcp(fp);
1053   int gotdnsnak;
1054   u_int32_t compproto;
1055   struct compreq *pcomp;
1056   struct in_addr ipaddr, dstipaddr, have_ip;
1057   char tbuff[100], tbuff2[100];
1058   struct fsm_opt *opt, nak;
1059
1060   gotdnsnak = 0;
1061
1062   while (end - cp >= sizeof(opt->hdr)) {
1063     if ((opt = fsm_readopt(&cp)) == NULL)
1064       break;
1065
1066     snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id),
1067              opt->hdr.len);
1068
1069     switch (opt->hdr.id) {
1070     case TY_IPADDR:             /* RFC1332 */
1071       memcpy(&ipaddr.s_addr, opt->data, 4);
1072       log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1073
1074       switch (mode_type) {
1075       case MODE_REQ:
1076         ipcp->peer_req = 1;
1077         ipcp_ValidateReq(ipcp, ipaddr, dec);
1078         break;
1079
1080       case MODE_NAK:
1081         if (ncprange_containsip4(&ipcp->cfg.my_range, ipaddr)) {
1082           /* Use address suggested by peer */
1083           snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff,
1084                    inet_ntoa(ipcp->my_ip));
1085           log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr));
1086           ipcp->my_ip = ipaddr;
1087           ncpaddr_setip4(&ncpaddr, ipcp->my_ip);
1088           bundle_AdjustFilters(fp->bundle, &ncpaddr, NULL);
1089         } else {
1090           log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE,
1091                     "%s: Unacceptable address!\n", inet_ntoa(ipaddr));
1092           fsm_Close(&ipcp->fsm);
1093         }
1094         break;
1095
1096       case MODE_REJ:
1097         ipcp->peer_reject |= (1 << opt->hdr.id);
1098         break;
1099       }
1100       break;
1101
1102     case TY_COMPPROTO:
1103       pcomp = (struct compreq *)opt->data;
1104       compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) +
1105                   pcomp->compcid;
1106       log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto));
1107
1108       switch (mode_type) {
1109       case MODE_REQ:
1110         if (!IsAccepted(ipcp->cfg.vj.neg))
1111           fsm_rej(dec, opt);
1112         else {
1113           switch (opt->hdr.len) {
1114           case 4:               /* RFC1172 */
1115             if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
1116               log_Printf(LogWARN, "Peer is speaking RFC1172 compression "
1117                          "protocol !\n");
1118               ipcp->heis1172 = 1;
1119               ipcp->peer_compproto = compproto;
1120               fsm_ack(dec, opt);
1121             } else {
1122               pcomp->proto = htons(PROTO_VJCOMP);
1123               nak.hdr.id = TY_COMPPROTO;
1124               nak.hdr.len = 4;
1125               memcpy(nak.data, &pcomp, 2);
1126               fsm_nak(dec, &nak);
1127             }
1128             break;
1129           case 6:               /* RFC1332 */
1130             if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
1131               if (pcomp->slots >= MIN_VJ_STATES) {
1132                 /* Ok, we can do that */
1133                 ipcp->peer_compproto = compproto;
1134                 ipcp->heis1172 = 0;
1135                 fsm_ack(dec, opt);
1136               } else {
1137                 /* Get as close as we can to what he wants */
1138                 ipcp->heis1172 = 0;
1139                 pcomp->slots = pcomp->slots < MIN_VJ_STATES ?
1140                                MIN_VJ_STATES : MAX_VJ_STATES;
1141                 nak.hdr.id = TY_COMPPROTO;
1142                 nak.hdr.len = 4;
1143                 memcpy(nak.data, &pcomp, 2);
1144                 fsm_nak(dec, &nak);
1145               }
1146             } else {
1147               /* What we really want */
1148               pcomp->proto = htons(PROTO_VJCOMP);
1149               pcomp->slots = DEF_VJ_STATES;
1150               pcomp->compcid = 1;
1151               nak.hdr.id = TY_COMPPROTO;
1152               nak.hdr.len = 6;
1153               memcpy(nak.data, &pcomp, sizeof pcomp);
1154               fsm_nak(dec, &nak);
1155             }
1156             break;
1157           default:
1158             fsm_rej(dec, opt);
1159             break;
1160           }
1161         }
1162         break;
1163
1164       case MODE_NAK:
1165         if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
1166           if (pcomp->slots < MIN_VJ_STATES)
1167             pcomp->slots = MIN_VJ_STATES;
1168           compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) +
1169                       pcomp->compcid;
1170         } else
1171           compproto = 0;
1172         log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n",
1173                    tbuff, ipcp->my_compproto, compproto);
1174         ipcp->my_compproto = compproto;
1175         break;
1176
1177       case MODE_REJ:
1178         ipcp->peer_reject |= (1 << opt->hdr.id);
1179         break;
1180       }
1181       break;
1182
1183     case TY_IPADDRS:            /* RFC1172 */
1184       memcpy(&ipaddr.s_addr, opt->data, 4);
1185       memcpy(&dstipaddr.s_addr, opt->data + 4, 4);
1186       snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr));
1187       log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr));
1188
1189       switch (mode_type) {
1190       case MODE_REQ:
1191         fsm_rej(dec, opt);
1192         break;
1193
1194       case MODE_NAK:
1195       case MODE_REJ:
1196         break;
1197       }
1198       break;
1199
1200     case TY_PRIMARY_DNS:        /* DNS negotiation (rfc1877) */
1201     case TY_SECONDARY_DNS:
1202       memcpy(&ipaddr.s_addr, opt->data, 4);
1203       log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1204
1205       switch (mode_type) {
1206       case MODE_REQ:
1207         if (!IsAccepted(ipcp->cfg.ns.dns_neg)) {
1208           ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1209           fsm_rej(dec, opt);
1210           break;
1211         }
1212         have_ip = ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1];
1213
1214         if (opt->hdr.id == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr &&
1215             ipaddr.s_addr == ipcp->ns.dns[1].s_addr) {
1216           /* Swap 'em 'round */
1217           ipcp->ns.dns[0] = ipcp->ns.dns[1];
1218           ipcp->ns.dns[1] = have_ip;
1219           have_ip = ipcp->ns.dns[0];
1220         }
1221
1222         if (ipaddr.s_addr != have_ip.s_addr) {
1223           /*
1224            * The client has got the DNS stuff wrong (first request) so
1225            * we'll tell 'em how it is
1226            */
1227           nak.hdr.id = opt->hdr.id;
1228           nak.hdr.len = 6;
1229           memcpy(nak.data, &have_ip.s_addr, 4);
1230           fsm_nak(dec, &nak);
1231         } else {
1232           /*
1233            * Otherwise they have it right (this time) so we send a ack packet
1234            * back confirming it... end of story
1235            */
1236           fsm_ack(dec, opt);
1237         }
1238         break;
1239
1240       case MODE_NAK:
1241         if (IsEnabled(ipcp->cfg.ns.dns_neg)) {
1242           gotdnsnak = 1;
1243           memcpy(&ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1].s_addr,
1244                  opt->data, 4);
1245         }
1246         break;
1247
1248       case MODE_REJ:            /* Can't do much, stop asking */
1249         ipcp->peer_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1250         break;
1251       }
1252       break;
1253
1254     case TY_PRIMARY_NBNS:       /* M$ NetBIOS nameserver hack (rfc1877) */
1255     case TY_SECONDARY_NBNS:
1256       memcpy(&ipaddr.s_addr, opt->data, 4);
1257       log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1258
1259       switch (mode_type) {
1260       case MODE_REQ:
1261         have_ip.s_addr =
1262           ipcp->cfg.ns.nbns[opt->hdr.id == TY_PRIMARY_NBNS ? 0 : 1].s_addr;
1263
1264         if (have_ip.s_addr == INADDR_ANY) {
1265           log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n");
1266           ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1267           fsm_rej(dec, opt);
1268           break;
1269         }
1270
1271         if (ipaddr.s_addr != have_ip.s_addr) {
1272           nak.hdr.id = opt->hdr.id;
1273           nak.hdr.len = 6;
1274           memcpy(nak.data, &have_ip.s_addr, 4);
1275           fsm_nak(dec, &nak);
1276         } else
1277           fsm_ack(dec, opt);
1278         break;
1279
1280       case MODE_NAK:
1281         log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", opt->hdr.id);
1282         break;
1283
1284       case MODE_REJ:
1285         log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", opt->hdr.id);
1286         break;
1287       }
1288       break;
1289
1290     default:
1291       if (mode_type != MODE_NOP) {
1292         ipcp->my_reject |= (1 << opt->hdr.id);
1293         fsm_rej(dec, opt);
1294       }
1295       break;
1296     }
1297   }
1298
1299   if (gotdnsnak) {
1300     if (ipcp->ns.writable) {
1301       log_Printf(LogDEBUG, "Updating resolver\n");
1302       if (!ipcp_WriteDNS(ipcp)) {
1303         ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS));
1304         ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS));
1305       } else
1306         bundle_AdjustDNS(fp->bundle);
1307     } else {
1308       log_Printf(LogDEBUG, "Not updating resolver (readonly)\n");
1309       bundle_AdjustDNS(fp->bundle);
1310     }
1311   }
1312
1313   if (mode_type != MODE_NOP) {
1314     if (mode_type == MODE_REQ && !ipcp->peer_req) {
1315       if (dec->rejend == dec->rej && dec->nakend == dec->nak) {
1316         /*
1317          * Pretend the peer has requested an IP.
1318          * We do this to ensure that we only send one NAK if the only
1319          * reason for the NAK is because the peer isn't sending a
1320          * TY_IPADDR REQ.  This stops us from repeatedly trying to tell
1321          * the peer that we have to have an IP address on their end.
1322          */
1323         ipcp->peer_req = 1;
1324       }
1325       ipaddr.s_addr = INADDR_ANY;
1326       ipcp_ValidateReq(ipcp, ipaddr, dec);
1327     }
1328     fsm_opt_normalise(dec);
1329   }
1330 }
1331
1332 extern struct mbuf *
1333 ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
1334 {
1335   /* Got PROTO_IPCP from link */
1336   m_settype(bp, MB_IPCPIN);
1337   if (bundle_Phase(bundle) == PHASE_NETWORK)
1338     fsm_Input(&bundle->ncp.ipcp.fsm, bp);
1339   else {
1340     if (bundle_Phase(bundle) < PHASE_NETWORK)
1341       log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n",
1342                  l->name, bundle_PhaseName(bundle));
1343     m_freem(bp);
1344   }
1345   return NULL;
1346 }
1347
1348 int
1349 ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr)
1350 {
1351   struct ipcp *ipcp = &bundle->ncp.ipcp;
1352   struct in_addr myaddr;
1353
1354   memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
1355   iplist_reset(&ipcp->cfg.peer_list);
1356   ipcp->peer_ip = hisaddr;
1357   ncprange_setip4host(&ipcp->cfg.peer_range, hisaddr);
1358   ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
1359
1360   return ipcp_SetIPaddress(ipcp, myaddr, hisaddr);
1361 }
1362
1363 int
1364 ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr)
1365 {
1366   struct in_addr myaddr;
1367   struct ncp *ncp = &bundle->ncp;
1368   struct ipcp *ipcp = &ncp->ipcp;
1369   struct ncpaddr ncpaddr;
1370
1371   /* Use `hisaddr' for the peers address (set iface if `setaddr') */
1372   memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
1373   iplist_reset(&ipcp->cfg.peer_list);
1374   if (strpbrk(hisaddr, ",-")) {
1375     iplist_setsrc(&ipcp->cfg.peer_list, hisaddr);
1376     if (iplist_isvalid(&ipcp->cfg.peer_list)) {
1377       iplist_setrandpos(&ipcp->cfg.peer_list);
1378       ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip);
1379       if (ipcp->peer_ip.s_addr == INADDR_ANY) {
1380         log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src);
1381         return 0;
1382       }
1383       ncprange_setip4host(&ipcp->cfg.peer_range, ipcp->peer_ip);
1384     } else {
1385       log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr);
1386       return 0;
1387     }
1388   } else if (ncprange_aton(&ipcp->cfg.peer_range, ncp, hisaddr) != 0) {
1389     if (ncprange_family(&ipcp->cfg.my_range) != AF_INET) {
1390       log_Printf(LogWARN, "%s: Not an AF_INET address !\n", hisaddr);
1391       return 0;
1392     }
1393     ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
1394     ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip);
1395
1396     if (setaddr && !ipcp_SetIPaddress(ipcp, myaddr, ipcp->peer_ip))
1397       return 0;
1398   } else
1399     return 0;
1400
1401   ncpaddr_setip4(&ncpaddr, ipcp->peer_ip);
1402   bundle_AdjustFilters(bundle, NULL, &ncpaddr);
1403
1404   return 1;     /* Ok */
1405 }
1406
1407 struct in_addr
1408 addr2mask(struct in_addr addr)
1409 {
1410   u_int32_t haddr = ntohl(addr.s_addr);
1411
1412   haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET :
1413           IN_CLASSB(haddr) ? IN_CLASSB_NET :
1414           IN_CLASSC_NET;
1415   addr.s_addr = htonl(haddr);
1416
1417   return addr;
1418 }
1419
1420 size_t
1421 ipcp_QueueLen(struct ipcp *ipcp)
1422 {
1423   struct mqueue *q;
1424   size_t result;
1425
1426   result = 0;
1427   for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++)
1428     result += q->len;
1429
1430   return result;
1431 }
1432
1433 int
1434 ipcp_PushPacket(struct ipcp *ipcp, struct link *l)
1435 {
1436   struct bundle *bundle = ipcp->fsm.bundle;
1437   struct mqueue *queue;
1438   struct mbuf *bp;
1439   int m_len;
1440   u_int32_t secs = 0;
1441   unsigned alivesecs = 0;
1442
1443   if (ipcp->fsm.state != ST_OPENED)
1444     return 0;
1445
1446   /*
1447    * If ccp is not open but is required, do nothing.
1448    */
1449   if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) {
1450     log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name);
1451     return 0;
1452   }
1453
1454   queue = ipcp->Queue + IPCP_QUEUES(ipcp) - 1;
1455   do {
1456     if (queue->top) {
1457       bp = m_dequeue(queue);
1458       bp = mbuf_Read(bp, &secs, sizeof secs);
1459       bp = m_pullup(bp);
1460       m_len = m_length(bp);
1461       if (!FilterCheck(MBUF_CTOP(bp), AF_INET, &bundle->filter.alive,
1462                        &alivesecs)) {
1463         if (secs == 0)
1464           secs = alivesecs;
1465         bundle_StartIdleTimer(bundle, secs);
1466       }
1467       link_PushPacket(l, bp, bundle, 0, PROTO_IP);
1468       ipcp_AddOutOctets(ipcp, m_len);
1469       return 1;
1470     }
1471   } while (queue-- != ipcp->Queue);
1472
1473   return 0;
1474 }