tun.c

   1 /*
   2  * OpenConnect (SSL + DTLS) VPN client
   3  *
   4  * Copyright © 2008-2010 Intel Corporation.
   5  *
   6  * Author: David Woodhouse <dwmw2@infradead.org>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * version 2.1, as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to:
  19  *
  20  *   Free Software Foundation, Inc.
  21  *   51 Franklin Street, Fifth Floor,
  22  *   Boston, MA 02110-1301 USA
  23  */
  24
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <sys/socket.h>
  28 #include <sys/ioctl.h>
  29 #include <string.h>
  30 #include <signal.h>
  31 #include <fcntl.h>
  32 #include <unistd.h>
  33 #include <netdb.h>
  34 #include <netinet/in_systm.h>
  35 #include <netinet/in.h>
  36 #include <netinet/ip.h>
  37 #include <net/if.h>
  38 #include <arpa/inet.h>
  39 #include <errno.h>
  40 #if defined(__sun__)
  41 #include <stropts.h>
  42 #include <sys/sockio.h>
  43 #endif
  44
  45 #include "openconnect.h"
  46
  47 /*
  48  * If an if_tun.h include file was found anywhere (by the Makefile), it's
  49  * included. Else, we end up assuming that we have BSD-style devices such
  50  * as /dev/tun0 etc.
  51  */
  52 #ifdef IF_TUN_HDR
  53 #include IF_TUN_HDR
  54 #endif
  55
  56 /*
  57  * The OS X tun/tap driver doesn't provide a header file; you're expected
  58  * to define this for yourself.
  59  */
  60 #ifdef __APPLE__
  61 #define TUNSIFHEAD  _IOW('t', 96, int)
  62 #endif
  63
  64 /*
  65  * OpenBSD always puts the protocol family prefix onto packets. Other
  66  * systems let us enable that with the TUNSIFHEAD ioctl, and some of them
  67  * (e.g. FreeBSD) _need_ it otherwise they'll interpret IPv6 packets as IPv4.
  68  */
  69 #if defined(__OpenBSD__) || defined(TUNSIFHEAD)
  70 #define TUN_HAS_AF_PREFIX 1
  71 #endif
  72
  73 #ifdef __sun__
  74 static int local_config_tun(struct openconnect_info *vpninfo, int mtu_only)
  75 {
  76         if (!mtu_only)
  77                 vpninfo->progress(vpninfo, PRG_ERR,
  78                                   "No vpnc-script configured. Need Solaris IP-setting code\n");
  79         return 0;
  80 }
  81 #else
  82 static int local_config_tun(struct openconnect_info *vpninfo, int mtu_only)
  83 {
  84         struct ifreq ifr;
  85         int net_fd;
  86
  87         net_fd = socket(PF_INET, SOCK_DGRAM, 0);
  88         if (net_fd < 0) {
  89                 perror("open net");
  90                 return -EINVAL;
  91         }
  92         memset(&ifr, 0, sizeof(ifr));
  93         strncpy(ifr.ifr_name, vpninfo->ifname, sizeof(ifr.ifr_name) - 1);
  94
  95         if (!mtu_only) {
  96                 struct sockaddr_in addr;
  97
  98                 if (ioctl(net_fd, SIOCGIFFLAGS, &ifr) < 0)
  99                         perror("SIOCGIFFLAGS");
 100
 101                 ifr.ifr_flags |= IFF_UP | IFF_POINTOPOINT;
 102                 if (ioctl(net_fd, SIOCSIFFLAGS, &ifr) < 0)
 103                         perror("SIOCSIFFLAGS");
 104
 105                 addr.sin_family = AF_INET;
 106                 addr.sin_addr.s_addr = inet_addr(vpninfo->vpn_addr);
 107                 memcpy(&ifr.ifr_addr, &addr, sizeof(addr));
 108                 if (ioctl(net_fd, SIOCSIFADDR, &ifr) < 0)
 109                         perror("SIOCSIFADDR");
 110         }
 111
 112         ifr.ifr_mtu = vpninfo->mtu;
 113         if (ioctl(net_fd, SIOCSIFMTU, &ifr) < 0)
 114                 perror("SIOCSIFMTU");
 115
 116         close(net_fd);
 117
 118         return 0;
 119 }
 120 #endif
 121
 122 static int setenv_int(const char *opt, int value)
 123 {
 124         char buf[16];
 125         sprintf(buf, "%d", value);
 126         return setenv(opt, buf, 1);
 127 }
 128
 129 static int netmasklen(struct in_addr addr)
 130 {
 131         int masklen;
 132
 133         for (masklen = 0; masklen < 32; masklen++) {
 134                 if (ntohl(addr.s_addr) >= (0xffffffff << masklen))
 135                         break;
 136         }
 137         return 32 - masklen;
 138 }
 139
 140 static int process_split_xxclude(struct openconnect_info *vpninfo,
 141                                  char *in_ex, char *route, int *v4_incs,
 142                                  int *v6_incs)
 143 {
 144         struct in_addr addr;
 145         char envname[80];
 146         char *slash;
 147
 148         slash = strchr(route, '/');
 149         if (!slash) {
 150         badinc:
 151                 vpninfo->progress(vpninfo, PRG_ERR,
 152                                   "Discard bad split %sclude: \"%s\"\n",
 153                                   in_ex, route);
 154                 return -EINVAL;
 155         }
 156
 157         *slash = 0;
 158
 159         if (strchr(route, ':')) {
 160                 snprintf(envname, 79, "CISCO_IPV6_SPLIT_%sC_%d_ADDR", in_ex,
 161                          *v6_incs);
 162                 setenv(envname, route, 1);
 163
 164                 snprintf(envname, 79, "CISCO_IPV6_SPLIT_%sC_%d_MASKLEN", in_ex,
 165                          *v6_incs);
 166                 setenv(envname, slash+1, 1);
 167
 168                 (*v6_incs)++;
 169                 return 0;
 170         }
 171
 172         if (!inet_aton(route, &addr)) {
 173                 *slash = '/';
 174                 goto badinc;
 175         }
 176
 177         envname[79] = 0;
 178         snprintf(envname, 79, "CISCO_SPLIT_%sC_%d_ADDR", in_ex, *v4_incs);
 179         setenv(envname, route, 1);
 180
 181         /* Put it back how we found it */
 182         *slash = '/';
 183
 184         if (!inet_aton(slash+1, &addr))
 185                 goto badinc;
 186
 187         snprintf(envname, 79, "CISCO_SPLIT_%sC_%d_MASK", in_ex, *v4_incs);
 188         setenv(envname, slash+1, 1);
 189
 190         snprintf(envname, 79, "CISCO_SPLIT_%sC_%d_MASKLEN", in_ex, *v4_incs);
 191         setenv_int(envname, netmasklen(addr));
 192
 193         (*v4_incs)++;
 194         return 0;
 195 }
 196
 197 static int appendenv(const char *opt, const char *new)
 198 {
 199         char buf[1024];
 200         char *old = getenv(opt);
 201
 202         buf[1023] = 0;
 203         if (old)
 204                 snprintf(buf, 1023, "%s %s", old, new);
 205         else
 206                 snprintf(buf, 1023, "%s", new);
 207
 208         return setenv(opt, buf, 1);
 209 }
 210
 211 static void setenv_cstp_opts(struct openconnect_info *vpninfo)
 212 {
 213         char *env_buf;
 214         int buflen = 0;
 215         int bufofs = 0;
 216         struct vpn_option *opt;
 217
 218         for (opt = vpninfo->cstp_options; opt; opt = opt->next)
 219                 buflen += 2 + strlen(opt->option) + strlen(opt->value);
 220
 221         env_buf = malloc(buflen + 1);
 222         if (!env_buf)
 223                 return;
 224
 225         env_buf[buflen] = 0;
 226
 227         for (opt = vpninfo->cstp_options; opt; opt = opt->next)
 228                 bufofs += snprintf(env_buf + bufofs, buflen - bufofs,
 229                                    "%s=%s\n", opt->option, opt->value);
 230
 231         setenv("CISCO_CSTP_OPTIONS", env_buf, 1);
 232         free(env_buf);
 233 }
 234
 235 static void set_banner(struct openconnect_info *vpninfo)
 236 {
 237         char *banner, *q;
 238         const char *p;
 239
 240         if (!vpninfo->banner || !(banner = malloc(strlen(vpninfo->banner)))) {
 241                 unsetenv("CISCO_BANNER");
 242                 return;
 243         }
 244         p = vpninfo->banner;
 245         q = banner;
 246
 247         while (*p) {
 248                 if (*p == '%' && isxdigit(p[1]) && isxdigit(p[2])) {
 249                         *(q++) = unhex(p + 1);
 250                         p += 3;
 251                 } else
 252                         *(q++) = *(p++);
 253         }
 254         *q = 0;
 255         setenv("CISCO_BANNER", banner, 1);
 256
 257         free(banner);
 258 }
 259
 260 static void set_script_env(struct openconnect_info *vpninfo)
 261 {
 262         char host[80];
 263         int ret = getnameinfo(vpninfo->peer_addr, vpninfo->peer_addrlen, host,
 264                               sizeof(host), NULL, 0, NI_NUMERICHOST);
 265         if (!ret)
 266                 setenv("VPNGATEWAY", host, 1);
 267
 268         setenv("reason", "connect", 1);
 269         set_banner(vpninfo);
 270         unsetenv("CISCO_SPLIT_INC");
 271         unsetenv("CISCO_SPLIT_EXC");
 272
 273         setenv_int("INTERNAL_IP4_MTU", vpninfo->mtu);
 274
 275         if (vpninfo->vpn_addr) {
 276                 setenv("INTERNAL_IP4_ADDRESS", vpninfo->vpn_addr, 1);
 277                 if (vpninfo->vpn_netmask) {
 278                         struct in_addr addr;
 279                         struct in_addr mask;
 280
 281                         if (inet_aton(vpninfo->vpn_addr, &addr) &&
 282                             inet_aton(vpninfo->vpn_netmask, &mask)) {
 283                                 char *netaddr;
 284
 285                                 addr.s_addr &= mask.s_addr;
 286                                 netaddr = inet_ntoa(addr);
 287
 288                                 setenv("INTERNAL_IP4_NETADDR", netaddr, 1);
 289                                 setenv("INTERNAL_IP4_NETMASK", vpninfo->vpn_netmask, 1);
 290                                 setenv_int("INTERNAL_IP4_NETMASKLEN", netmasklen(mask));
 291                         }
 292                 }
 293         }
 294         if (vpninfo->vpn_addr6) {
 295                 setenv("INTERNAL_IP6_ADDRESS", vpninfo->vpn_addr6, 1);
 296                 setenv("INTERNAL_IP6_NETMASK", vpninfo->vpn_netmask6, 1);
 297         }
 298
 299         if (vpninfo->vpn_dns[0])
 300                 setenv("INTERNAL_IP4_DNS", vpninfo->vpn_dns[0], 1);
 301         else
 302                 unsetenv("INTERNAL_IP4_DNS");
 303         if (vpninfo->vpn_dns[1])
 304                 appendenv("INTERNAL_IP4_DNS", vpninfo->vpn_dns[1]);
 305         if (vpninfo->vpn_dns[2])
 306                 appendenv("INTERNAL_IP4_DNS", vpninfo->vpn_dns[2]);
 307
 308         if (vpninfo->vpn_nbns[0])
 309                 setenv("INTERNAL_IP4_NBNS", vpninfo->vpn_nbns[0], 1);
 310         else
 311                 unsetenv("INTERNAL_IP4_NBNS");
 312         if (vpninfo->vpn_nbns[1])
 313                 appendenv("INTERNAL_IP4_NBNS", vpninfo->vpn_nbns[1]);
 314         if (vpninfo->vpn_nbns[2])
 315                 appendenv("INTERNAL_IP4_NBNS", vpninfo->vpn_nbns[2]);
 316
 317         if (vpninfo->vpn_domain)
 318                 setenv("CISCO_DEF_DOMAIN", vpninfo->vpn_domain, 1);
 319         else unsetenv ("CISCO_DEF_DOMAIN");
 320
 321         if (vpninfo->vpn_proxy_pac)
 322                 setenv("CISCO_PROXY_PAC", vpninfo->vpn_proxy_pac, 1);
 323
 324         if (vpninfo->split_includes) {
 325                 struct split_include *this = vpninfo->split_includes;
 326                 int nr_split_includes = 0;
 327                 int nr_v6_split_includes = 0;
 328
 329                 while (this) {
 330                         process_split_xxclude(vpninfo, "IN", this->route,
 331                                               &nr_split_includes,
 332                                               &nr_v6_split_includes);
 333                         this = this->next;
 334                 }
 335                 if (nr_split_includes)
 336                         setenv_int("CISCO_SPLIT_INC", nr_split_includes);
 337                 if (nr_v6_split_includes)
 338                         setenv_int("CISCO_IPV6_SPLIT_INC", nr_v6_split_includes);
 339         }
 340         if (vpninfo->split_excludes) {
 341                 struct split_include *this = vpninfo->split_excludes;
 342                 int nr_split_excludes = 0;
 343                 int nr_v6_split_excludes = 0;
 344
 345                 while (this) {
 346                         process_split_xxclude(vpninfo, "EX", this->route,
 347                                               &nr_split_excludes,
 348                                               &nr_v6_split_excludes);
 349                         this = this->next;
 350                 }
 351                 if (nr_split_excludes)
 352                         setenv_int("CISCO_SPLIT_EXC", nr_split_excludes);
 353                 if (nr_v6_split_excludes)
 354                         setenv_int("CISCO_IPV6_SPLIT_EXC", nr_v6_split_excludes);
 355         }
 356         setenv_cstp_opts(vpninfo);
 357 }
 358
 359 static int script_config_tun(struct openconnect_info *vpninfo)
 360 {
 361         if (system(vpninfo->vpnc_script)) {
 362                 int e = errno;
 363                 vpninfo->progress(vpninfo, PRG_ERR,
 364                                   "Failed to spawn script '%s': %s\n",
 365                                   vpninfo->vpnc_script, strerror(e));
 366                 return -e;
 367         }
 368         return 0;
 369 }
 370
 371
 372 /* Set up a tuntap device. */
 373 int setup_tun(struct openconnect_info *vpninfo)
 374 {
 375         int tun_fd;
 376
 377         set_script_env(vpninfo);
 378
 379         if (vpninfo->script_tun) {
 380                 pid_t child;
 381                 int fds[2];
 382
 383                 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, fds)) {
 384                         perror("socketpair");
 385                         exit(1);
 386                 }
 387                 tun_fd = fds[0];
 388                 child = fork();
 389                 if (child < 0) {
 390                         perror("fork");
 391                         exit(1);
 392                 } else if (!child) {
 393                         close(tun_fd);
 394                         setenv_int("VPNFD", fds[1]);
 395                         execl("/bin/sh", "/bin/sh", "-c", vpninfo->vpnc_script, NULL);
 396                         perror("execl");
 397                         exit(1);
 398                 }
 399                 close(fds[1]);
 400                 vpninfo->script_tun = child;
 401                 vpninfo->ifname = "(script)";
 402         } else {
 403 #ifdef IFF_TUN /* Linux */
 404                 struct ifreq ifr;
 405
 406                 tun_fd = open("/dev/net/tun", O_RDWR);
 407                 if (tun_fd < 0) {
 408                         vpninfo->progress(vpninfo, PRG_ERR,
 409                                           "Failed to open tun device: %s\n",
 410                                           strerror(errno));
 411                         exit(1);
 412                 }
 413                 memset(&ifr, 0, sizeof(ifr));
 414                 ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
 415                 if (vpninfo->ifname)
 416                         strncpy(ifr.ifr_name, vpninfo->ifname,
 417                                 sizeof(ifr.ifr_name) - 1);
 418                 if (ioctl(tun_fd, TUNSETIFF, (void *) &ifr) < 0) {
 419                         vpninfo->progress(vpninfo, PRG_ERR,
 420                                           "TUNSETIFF failed: %s\n",
 421                                           strerror(errno));
 422                         exit(1);
 423                 }
 424                 if (!vpninfo->ifname)
 425                         vpninfo->ifname = strdup(ifr.ifr_name);
 426 #elif defined (__sun__)
 427                 static char tun_name[80];
 428                 int tun2_fd, ip_fd = open("/dev/ip", O_RDWR);
 429                 int unit_nr, mux_id;
 430                 struct ifreq ifr;
 431
 432                 if (ip_fd < 0) {
 433                         perror("open /dev/ip");
 434                         return -EIO;
 435                 }
 436
 437                 tun_fd = open("/dev/tun", O_RDWR);
 438                 if (tun_fd < 0) {
 439                         perror("open /dev/tun");
 440                         close(ip_fd);
 441                         return -EIO;
 442                 }
 443
 444                 unit_nr = ioctl(tun_fd, TUNNEWPPA, -1);
 445                 if (unit_nr < 0) {
 446                         perror("Failed to create new tun");
 447                         close(tun_fd);
 448                         close(ip_fd);
 449                         return -EIO;
 450                 }
 451
 452                 tun2_fd = open("/dev/tun", O_RDWR);
 453                 if (tun2_fd < 0) {
 454                         perror("open /dev/tun again");
 455                         close(tun_fd);
 456                         close(ip_fd);
 457                         return -EIO;
 458                 }
 459                 if (ioctl(tun2_fd, I_PUSH, "ip") < 0) {
 460                         perror("Can't push IP");
 461                         close(tun2_fd);
 462                         close(tun_fd);
 463                         close(ip_fd);
 464                         return -EIO;
 465                 }
 466                 if (ioctl(tun2_fd, IF_UNITSEL, &unit_nr) < 0) {
 467                         perror("Can't select unit");
 468                         close(tun2_fd);
 469                         close(tun_fd);
 470                         close(ip_fd);
 471                         return -EIO;
 472                 }
 473                 mux_id = ioctl(ip_fd, I_PLINK, tun2_fd);
 474                 if (mux_id < 0) {
 475                         perror("Can't link tun to IP");
 476                         close(tun2_fd);
 477                         close(tun_fd);
 478                         close(ip_fd);
 479                         return -EIO;
 480                 }
 481                 close(tun2_fd);
 482
 483                 sprintf(tun_name, "tun%d", unit_nr);
 484                 vpninfo->ifname = tun_name;
 485
 486                 memset(&ifr, 0, sizeof(ifr));
 487                 strcpy(ifr.ifr_name, tun_name);
 488                 ifr.ifr_ip_muxid = mux_id;
 489
 490                 if (ioctl(ip_fd, SIOCSIFMUXID, &ifr) < 0) {
 491                         perror("Set mux id");
 492                         close(tun_fd);
 493                         ioctl(ip_fd, I_PUNLINK, mux_id);
 494                         close(ip_fd);
 495                         return -EIO;
 496                 }
 497                 /* Solaris tunctl needs this in order to tear it down */
 498                 vpninfo->progress(vpninfo, PRG_DEBUG, "mux id is %d\n", mux_id);
 499                 vpninfo->tun_muxid = mux_id;
 500                 vpninfo->ip_fd = ip_fd;
 501
 502 #else /* BSD et al have /dev/tun$x devices */
 503                 static char tun_name[80];
 504                 int i;
 505                 for (i = 0; i < 255; i++) {
 506                         sprintf(tun_name, "/dev/tun%d", i);
 507                         tun_fd = open(tun_name, O_RDWR);
 508                         if (tun_fd >= 0)
 509                                 break;
 510                 }
 511                 if (tun_fd < 0) {
 512                         perror("open tun");
 513                         exit(1);
 514                 }
 515                 vpninfo->ifname = tun_name + 5;
 516 #ifdef TUNSIFHEAD
 517                 i = 1;
 518                 if (ioctl(tun_fd, TUNSIFHEAD, &i) < 0) {
 519                         perror("TUNSIFHEAD");
 520                         exit(1);
 521                 }
 522 #endif
 523 #endif
 524                 if (vpninfo->vpnc_script) {
 525                         setenv("TUNDEV", vpninfo->ifname, 1);
 526                         script_config_tun(vpninfo);
 527                         /* We have to set the MTU for ourselves, because the script doesn't */
 528                         local_config_tun(vpninfo, 1);
 529                 } else
 530                         local_config_tun(vpninfo, 0);
 531         }
 532
 533         fcntl(tun_fd, F_SETFD, FD_CLOEXEC);
 534
 535         vpninfo->tun_fd = tun_fd;
 536
 537         if (vpninfo->select_nfds <= tun_fd)
 538                 vpninfo->select_nfds = tun_fd + 1;
 539
 540         FD_SET(tun_fd, &vpninfo->select_rfds);
 541
 542         fcntl(vpninfo->tun_fd, F_SETFL, fcntl(vpninfo->tun_fd, F_GETFL) | O_NONBLOCK);
 543
 544         return 0;
 545 }
 546
 547 int tun_mainloop(struct openconnect_info *vpninfo, int *timeout)
 548 {
 549         unsigned char buf[2000];
 550         int len;
 551         int work_done = 0;
 552
 553         if (FD_ISSET(vpninfo->tun_fd, &vpninfo->select_rfds)) {
 554                 while ((len = read(vpninfo->tun_fd, buf, sizeof(buf))) > 0) {
 555                         unsigned char *pkt = buf;
 556 #ifdef TUN_HAS_AF_PREFIX
 557                         pkt += 4;
 558                         len -= 4;
 559 #endif
 560                         if (queue_new_packet(&vpninfo->outgoing_queue, pkt,
 561                                              len))
 562                                 break;
 563
 564                         work_done = 1;
 565                         vpninfo->outgoing_qlen++;
 566                         if (vpninfo->outgoing_qlen == vpninfo->max_qlen) {
 567                                 FD_CLR(vpninfo->tun_fd, &vpninfo->select_rfds);
 568                                 break;
 569                         }
 570                 }
 571         } else if (vpninfo->outgoing_qlen < vpninfo->max_qlen) {
 572                 FD_SET(vpninfo->tun_fd, &vpninfo->select_rfds);
 573         }
 574
 575         /* The kernel returns -ENOMEM when the queue is full, so theoretically
 576            we could handle that and retry... but it doesn't let us poll() for
 577            the no-longer-full situation, so let's not bother. */
 578         while (vpninfo->incoming_queue) {
 579                 struct pkt *this = vpninfo->incoming_queue;
 580                 unsigned char *data = this->data;
 581                 int len = this->len;
 582
 583 #ifdef TUN_HAS_AF_PREFIX
 584                 struct ip *iph = (void *)data;
 585                 int type;
 586
 587                 if (iph->ip_v == 6)
 588                         type = AF_INET6;
 589                 else if (iph->ip_v == 4)
 590                         type = AF_INET;
 591                 else {
 592                         static int complained = 0;
 593                         if (!complained) {
 594                                 complained = 1;
 595                                 vpninfo->progress(vpninfo, PRG_ERR,
 596                                                   "Unknown packet (len %d) received: %02x %02x %02x %02x...\n",
 597                                                   len, data[0], data[1], data[2], data[3]);
 598                         }
 599                         free(this);
 600                         continue;
 601                 }
 602                 data -= 4;
 603                 len += 4;
 604                 *(int *)data = htonl(type);
 605 #endif
 606                 vpninfo->incoming_queue = this->next;
 607
 608                 if (write(vpninfo->tun_fd, data, len) < 0 &&
 609                     errno == ENOTCONN) {
 610                         vpninfo->quit_reason = "Client connection terminated";
 611                         return 1;
 612                 }
 613                 free(this);
 614         }
 615         /* Work is not done if we just got rid of packets off the queue */
 616         return work_done;
 617 }
 618
 619 void shutdown_tun(struct openconnect_info *vpninfo)
 620 {
 621         if (vpninfo->script_tun) {
 622                 kill(vpninfo->script_tun, SIGHUP);
 623         } else {
 624                 if (vpninfo->vpnc_script) {
 625                         setenv("reason", "disconnect", 1);
 626                         if (system(vpninfo->vpnc_script) == -1) {
 627                                 vpninfo->progress(vpninfo, PRG_ERR,
 628                                                   "Failed to spawn script '%s': %s\n",
 629                                                   vpninfo->vpnc_script,
 630                                                   strerror(errno));
 631                         }
 632                 }
 633 #ifdef __sun__
 634                 if (ioctl(vpninfo->ip_fd, I_PUNLINK, vpninfo->tun_muxid) < 0)
 635                         perror("ioctl(I_PUNLINK)");
 636
 637                 close(vpninfo->ip_fd);
 638                 vpninfo->ip_fd = -1;
 639 #endif
 640         }
 641
 642         close(vpninfo->tun_fd);
 643         vpninfo->tun_fd = -1;
 644 }