usr.sbin/ppp/iface.c

   1 /*-
   2  * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/usr.sbin/ppp/iface.c,v 1.13.2.9 2003/04/29 16:04:41 ume Exp $
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/socket.h>
  31 #include <netinet/in.h>
  32 #include <net/if.h>
  33 #include <net/if_dl.h>
  34 #ifdef __DragonFly__
  35 #include <net/if_var.h>
  36 #endif
  37 #include <net/route.h>
  38 #include <netinet/in_systm.h>
  39 #include <netinet/in_var.h>
  40 #include <netinet/ip.h>
  41 #ifndef NOINET6
  42 #include <netinet6/nd6.h>
  43 #endif
  44 #include <sys/un.h>
  45
  46 #include <errno.h>
  47 #include <string.h>
  48 #include <stdarg.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <sys/ioctl.h>
  52 #include <sys/sysctl.h>
  53 #include <termios.h>
  54 #include <unistd.h>
  55
  56 #include "layer.h"
  57 #include "defs.h"
  58 #include "command.h"
  59 #include "mbuf.h"
  60 #include "log.h"
  61 #include "id.h"
  62 #include "timer.h"
  63 #include "fsm.h"
  64 #include "iplist.h"
  65 #include "lqr.h"
  66 #include "hdlc.h"
  67 #include "throughput.h"
  68 #include "slcompress.h"
  69 #include "descriptor.h"
  70 #include "ncpaddr.h"
  71 #include "ipcp.h"
  72 #include "filter.h"
  73 #include "lcp.h"
  74 #include "ccp.h"
  75 #include "link.h"
  76 #include "mp.h"
  77 #ifndef NORADIUS
  78 #include "radius.h"
  79 #endif
  80 #include "ipv6cp.h"
  81 #include "ncp.h"
  82 #include "bundle.h"
  83 #include "prompt.h"
  84 #include "iface.h"
  85
  86 #define IN6MASK128      {{{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, \
  87                             0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }}}
  88 static const struct in6_addr in6mask128 = IN6MASK128;
  89
  90
  91 struct iface *
  92 iface_Create(const char *name)
  93 {
  94   int mib[6], maxtries, err;
  95   size_t needed, namelen;
  96   char *buf, *ptr, *end;
  97   struct if_msghdr *ifm;
  98   struct ifa_msghdr *ifam;
  99   struct sockaddr_dl *dl;
 100   struct sockaddr *sa[RTAX_MAX];
 101   struct iface *iface;
 102   struct iface_addr *addr;
 103
 104   mib[0] = CTL_NET;
 105   mib[1] = PF_ROUTE;
 106   mib[2] = 0;
 107   mib[3] = 0;
 108   mib[4] = NET_RT_IFLIST;
 109   mib[5] = 0;
 110
 111   maxtries = 20;
 112   err = 0;
 113   do {
 114     if (maxtries-- == 0 || (err && err != ENOMEM)) {
 115       fprintf(stderr, "iface_Create: sysctl: %s\n", strerror(err));
 116       return NULL;
 117     }
 118
 119     if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
 120       fprintf(stderr, "iface_Create: sysctl: estimate: %s\n",
 121                 strerror(errno));
 122       return NULL;
 123     }
 124
 125     if ((buf = (char *)malloc(needed)) == NULL) {
 126       fprintf(stderr, "iface_Create: malloc failed: %s\n", strerror(errno));
 127       return NULL;
 128     }
 129
 130     if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
 131       err = errno;
 132       free(buf);
 133       buf = NULL;
 134     }
 135   } while (buf == NULL);
 136
 137   ptr = buf;
 138   end = buf + needed;
 139   iface = NULL;
 140   namelen = strlen(name);
 141
 142   while (ptr < end && iface == NULL) {
 143     ifm = (struct if_msghdr *)ptr;                      /* On if_msghdr */
 144     if (ifm->ifm_type != RTM_IFINFO)
 145       break;
 146     dl = (struct sockaddr_dl *)(ifm + 1);               /* Single _dl at end */
 147     if (dl->sdl_nlen == namelen && !strncmp(name, dl->sdl_data, namelen)) {
 148       iface = (struct iface *)malloc(sizeof *iface);
 149       if (iface == NULL) {
 150         fprintf(stderr, "iface_Create: malloc: %s\n", strerror(errno));
 151         return NULL;
 152       }
 153       iface->name = strdup(name);
 154       iface->index = ifm->ifm_index;
 155       iface->flags = ifm->ifm_flags;
 156       iface->mtu = 0;
 157       iface->addrs = 0;
 158       iface->addr = NULL;
 159     }
 160     ptr += ifm->ifm_msglen;                             /* First ifa_msghdr */
 161     for (; ptr < end; ptr += ifam->ifam_msglen) {
 162       ifam = (struct ifa_msghdr *)ptr;                  /* Next if address */
 163
 164       if (ifam->ifam_type != RTM_NEWADDR)               /* finished this if */
 165         break;
 166
 167       if (iface != NULL && ifam->ifam_addrs & RTA_IFA) {
 168         /* Found a configured interface ! */
 169         iface_ParseHdr(ifam, sa);
 170
 171         if (sa[RTAX_IFA] && (sa[RTAX_IFA]->sa_family == AF_INET
 172 #ifndef NOINET6
 173                              || sa[RTAX_IFA]->sa_family == AF_INET6
 174 #endif
 175                              )) {
 176           /* Record the address */
 177
 178           addr = (struct iface_addr *)
 179             realloc(iface->addr, (iface->addrs + 1) * sizeof iface->addr[0]);
 180           if (addr == NULL)
 181             break;
 182           iface->addr = addr;
 183
 184           addr += iface->addrs;
 185           iface->addrs++;
 186
 187           ncprange_setsa(&addr->ifa, sa[RTAX_IFA], sa[RTAX_NETMASK]);
 188           if (sa[RTAX_BRD])
 189             ncpaddr_setsa(&addr->peer, sa[RTAX_BRD]);
 190           else
 191             ncpaddr_init(&addr->peer);
 192         }
 193       }
 194     }
 195   }
 196
 197   free(buf);
 198
 199   return iface;
 200 }
 201
 202 static int
 203 iface_addr_Zap(const char *name, struct iface_addr *addr, int s)
 204 {
 205   struct ifaliasreq ifra;
 206 #ifndef NOINET6
 207   struct in6_aliasreq ifra6;
 208 #endif
 209   struct sockaddr_in *me4, *msk4, *peer4;
 210   struct sockaddr_storage ssme, sspeer, ssmsk;
 211   int res;
 212
 213   ncprange_getsa(&addr->ifa, &ssme, &ssmsk);
 214   ncpaddr_getsa(&addr->peer, &sspeer);
 215   res = 0;
 216
 217   switch (ncprange_family(&addr->ifa)) {
 218   case AF_INET:
 219     memset(&ifra, '\0', sizeof ifra);
 220     strncpy(ifra.ifra_name, name, sizeof ifra.ifra_name - 1);
 221
 222     me4 = (struct sockaddr_in *)&ifra.ifra_addr;
 223     memcpy(me4, &ssme, sizeof *me4);
 224
 225     msk4 = (struct sockaddr_in *)&ifra.ifra_mask;
 226     memcpy(msk4, &ssmsk, sizeof *msk4);
 227
 228     peer4 = (struct sockaddr_in *)&ifra.ifra_broadaddr;
 229     if (ncpaddr_family(&addr->peer) == AF_UNSPEC) {
 230       peer4->sin_family = AF_INET;
 231       peer4->sin_len = sizeof(*peer4);
 232       peer4->sin_addr.s_addr = INADDR_NONE;
 233     } else
 234       memcpy(peer4, &sspeer, sizeof *peer4);
 235
 236     res = ID0ioctl(s, SIOCDIFADDR, &ifra);
 237     if (log_IsKept(LogDEBUG)) {
 238       char buf[100];
 239
 240       snprintf(buf, sizeof buf, "%s", ncprange_ntoa(&addr->ifa));
 241       log_Printf(LogWARN, "%s: DIFADDR %s -> %s returns %d\n",
 242                  ifra.ifra_name, buf, ncpaddr_ntoa(&addr->peer), res);
 243     }
 244     break;
 245
 246 #ifndef NOINET6
 247   case AF_INET6:
 248     memset(&ifra6, '\0', sizeof ifra6);
 249     strncpy(ifra6.ifra_name, name, sizeof ifra6.ifra_name - 1);
 250
 251     memcpy(&ifra6.ifra_addr, &ssme, sizeof ifra6.ifra_addr);
 252     memcpy(&ifra6.ifra_prefixmask, &ssmsk, sizeof ifra6.ifra_prefixmask);
 253     ifra6.ifra_prefixmask.sin6_family = AF_UNSPEC;
 254     if (ncpaddr_family(&addr->peer) == AF_UNSPEC)
 255       ifra6.ifra_dstaddr.sin6_family = AF_UNSPEC;
 256     else
 257       memcpy(&ifra6.ifra_dstaddr, &sspeer, sizeof ifra6.ifra_dstaddr);
 258     ifra6.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
 259     ifra6.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
 260
 261     res = ID0ioctl(s, SIOCDIFADDR_IN6, &ifra6);
 262     break;
 263 #endif
 264   }
 265
 266   if (res == -1) {
 267     char dst[40];
 268     const char *end =
 269 #ifndef NOINET6
 270       ncprange_family(&addr->ifa) == AF_INET6 ? "_IN6" :
 271 #endif
 272       "";
 273
 274     if (ncpaddr_family(&addr->peer) == AF_UNSPEC)
 275       log_Printf(LogWARN, "iface rm: ioctl(SIOCDIFADDR%s, %s): %s\n",
 276                  end, ncprange_ntoa(&addr->ifa), strerror(errno));
 277     else {
 278       snprintf(dst, sizeof dst, "%s", ncpaddr_ntoa(&addr->peer));
 279       log_Printf(LogWARN, "iface rm: ioctl(SIOCDIFADDR%s, %s -> %s): %s\n",
 280                  end, ncprange_ntoa(&addr->ifa), dst, strerror(errno));
 281     }
 282   }
 283
 284   return res != -1;
 285 }
 286
 287 static int
 288 iface_addr_Add(const char *name, struct iface_addr *addr, int s)
 289 {
 290   struct ifaliasreq ifra;
 291 #ifndef NOINET6
 292   struct in6_aliasreq ifra6;
 293 #endif
 294   struct sockaddr_in *me4, *msk4, *peer4;
 295   struct sockaddr_storage ssme, sspeer, ssmsk;
 296   int res;
 297
 298   ncprange_getsa(&addr->ifa, &ssme, &ssmsk);
 299   ncpaddr_getsa(&addr->peer, &sspeer);
 300   res = 0;
 301
 302   switch (ncprange_family(&addr->ifa)) {
 303   case AF_INET:
 304     memset(&ifra, '\0', sizeof ifra);
 305     strncpy(ifra.ifra_name, name, sizeof ifra.ifra_name - 1);
 306
 307     me4 = (struct sockaddr_in *)&ifra.ifra_addr;
 308     memcpy(me4, &ssme, sizeof *me4);
 309
 310     msk4 = (struct sockaddr_in *)&ifra.ifra_mask;
 311     memcpy(msk4, &ssmsk, sizeof *msk4);
 312
 313     peer4 = (struct sockaddr_in *)&ifra.ifra_broadaddr;
 314     if (ncpaddr_family(&addr->peer) == AF_UNSPEC) {
 315       peer4->sin_family = AF_INET;
 316       peer4->sin_len = sizeof(*peer4);
 317       peer4->sin_addr.s_addr = INADDR_NONE;
 318     } else
 319       memcpy(peer4, &sspeer, sizeof *peer4);
 320
 321     res = ID0ioctl(s, SIOCAIFADDR, &ifra);
 322     if (log_IsKept(LogDEBUG)) {
 323       char buf[100];
 324
 325       snprintf(buf, sizeof buf, "%s", ncprange_ntoa(&addr->ifa));
 326       log_Printf(LogWARN, "%s: AIFADDR %s -> %s returns %d\n",
 327                  ifra.ifra_name, buf, ncpaddr_ntoa(&addr->peer), res);
 328     }
 329     break;
 330
 331 #ifndef NOINET6
 332   case AF_INET6:
 333     memset(&ifra6, '\0', sizeof ifra6);
 334     strncpy(ifra6.ifra_name, name, sizeof ifra6.ifra_name - 1);
 335
 336     memcpy(&ifra6.ifra_addr, &ssme, sizeof ifra6.ifra_addr);
 337     memcpy(&ifra6.ifra_prefixmask, &ssmsk, sizeof ifra6.ifra_prefixmask);
 338     if (ncpaddr_family(&addr->peer) == AF_UNSPEC)
 339       ifra6.ifra_dstaddr.sin6_family = AF_UNSPEC;
 340     else if (memcmp(&((struct sockaddr_in6 *)&ssmsk)->sin6_addr, &in6mask128,
 341                     sizeof in6mask128) == 0)
 342       memcpy(&ifra6.ifra_dstaddr, &sspeer, sizeof ifra6.ifra_dstaddr);
 343     ifra6.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
 344     ifra6.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
 345
 346     res = ID0ioctl(s, SIOCAIFADDR_IN6, &ifra6);
 347     break;
 348 #endif
 349   }
 350
 351   if (res == -1) {
 352     char dst[40];
 353     const char *end =
 354 #ifndef NOINET6
 355       ncprange_family(&addr->ifa) == AF_INET6 ? "_IN6" :
 356 #endif
 357       "";
 358
 359     if (ncpaddr_family(&addr->peer) == AF_UNSPEC)
 360       log_Printf(LogWARN, "iface add: ioctl(SIOCAIFADDR%s, %s): %s\n",
 361                  end, ncprange_ntoa(&addr->ifa), strerror(errno));
 362     else {
 363       snprintf(dst, sizeof dst, "%s", ncpaddr_ntoa(&addr->peer));
 364       log_Printf(LogWARN, "iface add: ioctl(SIOCAIFADDR%s, %s -> %s): %s\n",
 365                  end, ncprange_ntoa(&addr->ifa), dst, strerror(errno));
 366     }
 367   }
 368
 369   return res != -1;
 370 }
 371
 372
 373 void
 374 iface_Clear(struct iface *iface, struct ncp *ncp, int family, int how)
 375 {
 376   int af, inskip, in6skip, s4 = -1, s6 = -1, *s;
 377   unsigned n;
 378
 379   if (iface->addrs) {
 380     inskip = in6skip = how == IFACE_CLEAR_ALL ? 0 : 1;
 381
 382     for (n = 0; n < iface->addrs; n++) {
 383       af = ncprange_family(&iface->addr[n].ifa);
 384       if (family == 0 || family == af) {
 385         if (!iface->addr[n].system && (how & IFACE_SYSTEM))
 386           continue;
 387         switch (af) {
 388         case AF_INET:
 389           if (inskip) {
 390             inskip = 0;
 391             continue;
 392           }
 393           s = &s4;
 394           break;
 395
 396 #ifndef NOINET6
 397         case AF_INET6:
 398           if (in6skip) {
 399             in6skip = 0;
 400             continue;
 401           }
 402           s = &s6;
 403           break;
 404 #endif
 405         default:
 406           continue;
 407         }
 408
 409         if (*s == -1 && (*s = ID0socket(af, SOCK_DGRAM, 0)) == -1)
 410           log_Printf(LogERROR, "iface_Clear: socket(): %s\n", strerror(errno));
 411         else if (iface_addr_Zap(iface->name, iface->addr + n, *s)) {
 412           ncp_IfaceAddrDeleted(ncp, iface->addr + n);
 413           bcopy(iface->addr + n + 1, iface->addr + n,
 414                 (iface->addrs - n - 1) * sizeof *iface->addr);
 415           iface->addrs--;
 416           n--;
 417         }
 418       }
 419     }
 420
 421     /* Don't bother realloc()ing - we have little to gain */
 422
 423     if (s4)
 424       close(s4);
 425     if (s6)
 426       close(s6);
 427   }
 428 }
 429
 430 int
 431 iface_Add(struct iface *iface, struct ncp *ncp, const struct ncprange *ifa,
 432           const struct ncpaddr *peer, int how)
 433 {
 434   int af, removed, s;
 435   unsigned n;
 436   struct ncpaddr ncplocal;
 437   struct iface_addr *addr, newaddr;
 438
 439   af = ncprange_family(ifa);
 440   if ((s = ID0socket(af, SOCK_DGRAM, 0)) == -1) {
 441     log_Printf(LogERROR, "iface_Add: socket(): %s\n", strerror(errno));
 442     return 0;
 443   }
 444   ncprange_getaddr(ifa, &ncplocal);
 445
 446   for (n = 0; n < iface->addrs; n++) {
 447     if (ncprange_contains(&iface->addr[n].ifa, &ncplocal) ||
 448         ncpaddr_equal(&iface->addr[n].peer, peer)) {
 449       /* Replace this sockaddr */
 450       if (!(how & IFACE_FORCE_ADD)) {
 451         close(s);
 452         return 0;       /* errno = EEXIST; */
 453       }
 454
 455       if (ncprange_equal(&iface->addr[n].ifa, ifa) &&
 456           ncpaddr_equal(&iface->addr[n].peer, peer)) {
 457         close(s);
 458         return 1;       /* Already there */
 459       }
 460
 461       removed = iface_addr_Zap(iface->name, iface->addr + n, s);
 462       if (removed)
 463         ncp_IfaceAddrDeleted(ncp, iface->addr + n);
 464       ncprange_copy(&iface->addr[n].ifa, ifa);
 465       ncpaddr_copy(&iface->addr[n].peer, peer);
 466       if (!iface_addr_Add(iface->name, iface->addr + n, s)) {
 467         if (removed) {
 468           bcopy(iface->addr + n + 1, iface->addr + n,
 469                 (iface->addrs - n - 1) * sizeof *iface->addr);
 470           iface->addrs--;
 471           n--;
 472         }
 473         close(s);
 474         return 0;
 475       }
 476       close(s);
 477       ncp_IfaceAddrAdded(ncp, iface->addr + n);
 478       return 1;
 479     }
 480   }
 481
 482   addr = (struct iface_addr *)realloc
 483     (iface->addr, (iface->addrs + 1) * sizeof iface->addr[0]);
 484   if (addr == NULL) {
 485     log_Printf(LogERROR, "iface_inAdd: realloc: %s\n", strerror(errno));
 486     close(s);
 487     return 0;
 488   }
 489   iface->addr = addr;
 490
 491   ncprange_copy(&newaddr.ifa, ifa);
 492   ncpaddr_copy(&newaddr.peer, peer);
 493   newaddr.system = !!(how & IFACE_SYSTEM);
 494   if (!iface_addr_Add(iface->name, &newaddr, s)) {
 495     close(s);
 496     return 0;
 497   }
 498
 499   if (how & IFACE_ADD_FIRST) {
 500     /* Stuff it at the start of our list */
 501     n = 0;
 502     bcopy(iface->addr, iface->addr + 1, iface->addrs * sizeof *iface->addr);
 503   } else
 504     n = iface->addrs;
 505
 506   iface->addrs++;
 507   memcpy(iface->addr + n, &newaddr, sizeof(*iface->addr));
 508
 509   close(s);
 510   ncp_IfaceAddrAdded(ncp, iface->addr + n);
 511
 512   return 1;
 513 }
 514
 515 int
 516 iface_Delete(struct iface *iface, struct ncp *ncp, const struct ncpaddr *del)
 517 {
 518   struct ncpaddr found;
 519   unsigned n;
 520   int res, s;
 521
 522   if ((s = ID0socket(ncpaddr_family(del), SOCK_DGRAM, 0)) == -1) {
 523     log_Printf(LogERROR, "iface_Delete: socket(): %s\n", strerror(errno));
 524     return 0;
 525   }
 526
 527   for (n = res = 0; n < iface->addrs; n++) {
 528     ncprange_getaddr(&iface->addr[n].ifa, &found);
 529     if (ncpaddr_equal(&found, del)) {
 530       if (iface_addr_Zap(iface->name, iface->addr + n, s)) {
 531         ncp_IfaceAddrDeleted(ncp, iface->addr + n);
 532         bcopy(iface->addr + n + 1, iface->addr + n,
 533               (iface->addrs - n - 1) * sizeof *iface->addr);
 534         iface->addrs--;
 535         res = 1;
 536       }
 537       break;
 538     }
 539   }
 540
 541   close(s);
 542
 543   return res;
 544 }
 545
 546 #define IFACE_ADDFLAGS 1
 547 #define IFACE_DELFLAGS 2
 548
 549 static int
 550 iface_ChangeFlags(const char *ifname, int flags, int how)
 551 {
 552   struct ifreq ifrq;
 553   int s;
 554
 555   s = ID0socket(PF_INET, SOCK_DGRAM, 0);
 556   if (s < 0) {
 557     log_Printf(LogERROR, "iface_ChangeFlags: socket: %s\n", strerror(errno));
 558     return 0;
 559   }
 560
 561   memset(&ifrq, '\0', sizeof ifrq);
 562   strncpy(ifrq.ifr_name, ifname, sizeof ifrq.ifr_name - 1);
 563   ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0';
 564   if (ID0ioctl(s, SIOCGIFFLAGS, &ifrq) < 0) {
 565     log_Printf(LogERROR, "iface_ChangeFlags: ioctl(SIOCGIFFLAGS): %s\n",
 566        strerror(errno));
 567     close(s);
 568     return 0;
 569   }
 570
 571   if (how == IFACE_ADDFLAGS)
 572     ifrq.ifr_flags |= flags;
 573   else
 574     ifrq.ifr_flags &= ~flags;
 575
 576   if (ID0ioctl(s, SIOCSIFFLAGS, &ifrq) < 0) {
 577     log_Printf(LogERROR, "iface_ChangeFlags: ioctl(SIOCSIFFLAGS): %s\n",
 578        strerror(errno));
 579     close(s);
 580     return 0;
 581   }
 582   close(s);
 583
 584   return 1;     /* Success */
 585 }
 586
 587 int
 588 iface_SetFlags(const char *ifname, int flags)
 589 {
 590   return iface_ChangeFlags(ifname, flags, IFACE_ADDFLAGS);
 591 }
 592
 593 int
 594 iface_ClearFlags(const char *ifname, int flags)
 595 {
 596   return iface_ChangeFlags(ifname, flags, IFACE_DELFLAGS);
 597 }
 598
 599 void
 600 iface_Destroy(struct iface *iface)
 601 {
 602   /*
 603    * iface_Clear(iface, IFACE_CLEAR_ALL) must be called manually
 604    * if that's what the user wants.  It's better to leave the interface
 605    * allocated so that existing connections can continue to work.
 606    */
 607
 608   if (iface != NULL) {
 609     free(iface->name);
 610     free(iface->addr);
 611     free(iface);
 612   }
 613 }
 614
 615 #define if_entry(x) { IFF_##x, #x }
 616
 617 struct {
 618   int flag;
 619   const char *value;
 620 } if_flags[] = {
 621   if_entry(UP),
 622   if_entry(BROADCAST),
 623   if_entry(DEBUG),
 624   if_entry(LOOPBACK),
 625   if_entry(POINTOPOINT),
 626   if_entry(RUNNING),
 627   if_entry(NOARP),
 628   if_entry(PROMISC),
 629   if_entry(ALLMULTI),
 630   if_entry(OACTIVE),
 631   if_entry(SIMPLEX),
 632   if_entry(LINK0),
 633   if_entry(LINK1),
 634   if_entry(LINK2),
 635   if_entry(MULTICAST),
 636   { 0, "???" }
 637 };
 638
 639 int
 640 iface_Show(struct cmdargs const *arg)
 641 {
 642   struct ncpaddr ncpaddr;
 643   struct iface *iface = arg->bundle->iface, *current;
 644   unsigned f;
 645   int flags;
 646 #ifndef NOINET6
 647   int scopeid, width;
 648 #endif
 649   struct in_addr mask;
 650
 651   mask.s_addr = 0;      /* avoid gcc warnings */
 652
 653   current = iface_Create(iface->name);
 654   flags = iface->flags = current->flags;
 655   iface_Destroy(current);
 656
 657   prompt_Printf(arg->prompt, "%s (idx %d) <", iface->name, iface->index);
 658   for (f = 0; f < sizeof if_flags / sizeof if_flags[0]; f++)
 659     if ((if_flags[f].flag & flags)) {
 660       prompt_Printf(arg->prompt, "%s%s", flags == iface->flags ? "" : ",",
 661                     if_flags[f].value);
 662       flags &= ~if_flags[f].flag;
 663     }
 664
 665 #if 0
 666   if (flags)
 667     prompt_Printf(arg->prompt, "%s0x%x", flags == iface->flags ? "" : ",",
 668                   flags);
 669 #endif
 670
 671   prompt_Printf(arg->prompt, "> mtu %lu has %d address%s:\n", iface->mtu,
 672                 iface->addrs, iface->addrs == 1 ? "" : "es");
 673
 674   for (f = 0; f < iface->addrs; f++) {
 675     ncprange_getaddr(&iface->addr[f].ifa, &ncpaddr);
 676     switch (ncprange_family(&iface->addr[f].ifa)) {
 677     case AF_INET:
 678       prompt_Printf(arg->prompt, "  inet %s --> ", ncpaddr_ntoa(&ncpaddr));
 679       if (ncpaddr_family(&iface->addr[f].peer) == AF_UNSPEC)
 680         prompt_Printf(arg->prompt, "255.255.255.255");
 681       else
 682         prompt_Printf(arg->prompt, "%s", ncpaddr_ntoa(&iface->addr[f].peer));
 683       ncprange_getip4mask(&iface->addr[f].ifa, &mask);
 684       prompt_Printf(arg->prompt, " netmask 0x%08lx", (long)ntohl(mask.s_addr));
 685       break;
 686
 687 #ifndef NOINET6
 688     case AF_INET6:
 689       prompt_Printf(arg->prompt, "  inet6 %s", ncpaddr_ntoa(&ncpaddr));
 690       if (ncpaddr_family(&iface->addr[f].peer) != AF_UNSPEC)
 691         prompt_Printf(arg->prompt, " --> %s",
 692                       ncpaddr_ntoa(&iface->addr[f].peer));
 693       ncprange_getwidth(&iface->addr[f].ifa, &width);
 694       if (ncpaddr_family(&iface->addr[f].peer) == AF_UNSPEC)
 695         prompt_Printf(arg->prompt, " prefixlen %d", width);
 696       if ((scopeid = ncprange_scopeid(&iface->addr[f].ifa)) != -1)
 697         prompt_Printf(arg->prompt, " scopeid 0x%x", (unsigned)scopeid);
 698       break;
 699 #endif
 700     }
 701     prompt_Printf(arg->prompt, "\n");
 702   }
 703
 704   return 0;
 705 }
 706
 707 void
 708 iface_ParseHdr(struct ifa_msghdr *ifam, struct sockaddr *sa[RTAX_MAX])
 709 {
 710   char *wp;
 711   int rtax;
 712
 713   wp = (char *)(ifam + 1);
 714
 715   for (rtax = 0; rtax < RTAX_MAX; rtax++)
 716     if (ifam->ifam_addrs & (1 << rtax)) {
 717       sa[rtax] = (struct sockaddr *)wp;
 718       wp += RT_ROUNDUP(sa[rtax]->sa_len);
 719     } else
 720       sa[rtax] = NULL;
 721 }