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 #include <ctype.h>
  41 #if defined(__sun__)
  42 #include <stropts.h>
  43 #include <sys/sockio.h>
  44 #include <net/if_tun.h>
  45 #ifndef TUNNEWPPA
  46 #error "Install TAP driver from http://www.whiteboard.ne.jp/~admin2/tuntap/"
  47 #endif
  48 #endif
  49
  50 #include "openconnect-internal.h"
  51
  52 /*
  53  * If an if_tun.h include file was found anywhere (by the Makefile), it's
  54  * included. Else, we end up assuming that we have BSD-style devices such
  55  * as /dev/tun0 etc.
  56  */
  57 #ifdef IF_TUN_HDR
  58 #include IF_TUN_HDR
  59 #endif
  60
  61 /*
  62  * The OS X tun/tap driver doesn't provide a header file; you're expected
  63  * to define this for yourself.
  64  */
  65 #ifdef __APPLE__
  66 #define TUNSIFHEAD  _IOW('t', 96, int)
  67 #endif
  68
  69 /*
  70  * OpenBSD always puts the protocol family prefix onto packets. Other
  71  * systems let us enable that with the TUNSIFHEAD ioctl, and some of them
  72  * (e.g. FreeBSD) _need_ it otherwise they'll interpret IPv6 packets as IPv4.
  73  */
  74 #if defined(__OpenBSD__) || defined(TUNSIFHEAD)
  75 #define TUN_HAS_AF_PREFIX 1
  76 #endif
  77
  78 #ifdef __sun__
  79 static int local_config_tun(struct openconnect_info *vpninfo, int mtu_only)
  80 {
  81         if (!mtu_only)
  82                 vpn_progress(vpninfo, PRG_ERR,
  83                              _("No vpnc-script configured. Need Solaris IP-setting code\n"));
  84         return 0;
  85 }
  86 #else
  87 static int local_config_tun(struct openconnect_info *vpninfo, int mtu_only)
  88 {
  89         struct ifreq ifr;
  90         int net_fd;
  91
  92         net_fd = socket(PF_INET, SOCK_DGRAM, 0);
  93         if (net_fd < 0) {
  94                 perror(_("open net"));
  95                 return -EINVAL;
  96         }
  97         memset(&ifr, 0, sizeof(ifr));
  98         strncpy(ifr.ifr_name, vpninfo->ifname, sizeof(ifr.ifr_name) - 1);
  99
 100         if (!mtu_only) {
 101                 struct sockaddr_in addr;
 102
 103                 if (ioctl(net_fd, SIOCGIFFLAGS, &ifr) < 0)
 104                         perror(_("SIOCGIFFLAGS"));
 105
 106                 ifr.ifr_flags |= IFF_UP | IFF_POINTOPOINT;
 107                 if (ioctl(net_fd, SIOCSIFFLAGS, &ifr) < 0)
 108                         perror(_("SIOCSIFFLAGS"));
 109
 110                 addr.sin_family = AF_INET;
 111                 addr.sin_addr.s_addr = inet_addr(vpninfo->vpn_addr);
 112                 memcpy(&ifr.ifr_addr, &addr, sizeof(addr));
 113                 if (ioctl(net_fd, SIOCSIFADDR, &ifr) < 0)
 114                         perror(_("SIOCSIFADDR"));
 115         }
 116
 117         ifr.ifr_mtu = vpninfo->mtu;
 118         if (ioctl(net_fd, SIOCSIFMTU, &ifr) < 0)
 119                 perror(_("SIOCSIFMTU"));
 120
 121         close(net_fd);
 122
 123         return 0;
 124 }
 125 #endif
 126
 127 static int setenv_int(const char *opt, int value)
 128 {
 129         char buf[16];
 130         sprintf(buf, "%d", value);
 131         return setenv(opt, buf, 1);
 132 }
 133
 134 static int netmasklen(struct in_addr addr)
 135 {
 136         int masklen;
 137
 138         for (masklen = 0; masklen < 32; masklen++) {
 139                 if (ntohl(addr.s_addr) >= (0xffffffff << masklen))
 140                         break;
 141         }
 142         return 32 - masklen;
 143 }
 144
 145 static int process_split_xxclude(struct openconnect_info *vpninfo,
 146                                  int include, const char *route, int *v4_incs,
 147                                  int *v6_incs)
 148 {
 149         struct in_addr addr;
 150         const char *in_ex = include?"IN":"EX";
 151         char envname[80];
 152         char *slash;
 153
 154         slash = strchr(route, '/');
 155         if (!slash) {
 156         badinc:
 157                 if (include)
 158                         vpn_progress(vpninfo, PRG_ERR,
 159                                      _("Discard bad split include: \"%s\"\n"),
 160                                      route);
 161                 else
 162                         vpn_progress(vpninfo, PRG_ERR,
 163                                      _("Discard bad split exclude: \"%s\"\n"),
 164                                      route);
 165                 return -EINVAL;
 166         }
 167
 168         *slash = 0;
 169
 170         if (strchr(route, ':')) {
 171                 snprintf(envname, 79, "CISCO_IPV6_SPLIT_%sC_%d_ADDR", in_ex,
 172                          *v6_incs);
 173                 setenv(envname, route, 1);
 174
 175                 snprintf(envname, 79, "CISCO_IPV6_SPLIT_%sC_%d_MASKLEN", in_ex,
 176                          *v6_incs);
 177                 setenv(envname, slash+1, 1);
 178
 179                 (*v6_incs)++;
 180                 return 0;
 181         }
 182
 183         if (!inet_aton(route, &addr)) {
 184                 *slash = '/';
 185                 goto badinc;
 186         }
 187
 188         envname[79] = 0;
 189         snprintf(envname, 79, "CISCO_SPLIT_%sC_%d_ADDR", in_ex, *v4_incs);
 190         setenv(envname, route, 1);
 191
 192         /* Put it back how we found it */
 193         *slash = '/';
 194
 195         if (!inet_aton(slash+1, &addr))
 196                 goto badinc;
 197
 198         snprintf(envname, 79, "CISCO_SPLIT_%sC_%d_MASK", in_ex, *v4_incs);
 199         setenv(envname, slash+1, 1);
 200
 201         snprintf(envname, 79, "CISCO_SPLIT_%sC_%d_MASKLEN", in_ex, *v4_incs);
 202         setenv_int(envname, netmasklen(addr));
 203
 204         (*v4_incs)++;
 205         return 0;
 206 }
 207
 208 static int appendenv(const char *opt, const char *new)
 209 {
 210         char buf[1024];
 211         char *old = getenv(opt);
 212
 213         buf[1023] = 0;
 214         if (old)
 215                 snprintf(buf, 1023, "%s %s", old, new);
 216         else
 217                 snprintf(buf, 1023, "%s", new);
 218
 219         return setenv(opt, buf, 1);
 220 }
 221
 222 static void setenv_cstp_opts(struct openconnect_info *vpninfo)
 223 {
 224         char *env_buf;
 225         int buflen = 0;
 226         int bufofs = 0;
 227         struct vpn_option *opt;
 228
 229         for (opt = vpninfo->cstp_options; opt; opt = opt->next)
 230                 buflen += 2 + strlen(opt->option) + strlen(opt->value);
 231
 232         env_buf = malloc(buflen + 1);
 233         if (!env_buf)
 234                 return;
 235
 236         env_buf[buflen] = 0;
 237
 238         for (opt = vpninfo->cstp_options; opt; opt = opt->next)
 239                 bufofs += snprintf(env_buf + bufofs, buflen - bufofs,
 240                                    "%s=%s\n", opt->option, opt->value);
 241
 242         setenv("CISCO_CSTP_OPTIONS", env_buf, 1);
 243         free(env_buf);
 244 }
 245
 246 static void set_banner(struct openconnect_info *vpninfo)
 247 {
 248         char *banner, *q;
 249         const char *p;
 250
 251         if (!vpninfo->banner || !(banner = malloc(strlen(vpninfo->banner)))) {
 252                 unsetenv("CISCO_BANNER");
 253                 return;
 254         }
 255         p = vpninfo->banner;
 256         q = banner;
 257
 258         while (*p) {
 259                 if (*p == '%' && isxdigit(p[1]) && isxdigit(p[2])) {
 260                         *(q++) = unhex(p + 1);
 261                         p += 3;
 262                 } else
 263                         *(q++) = *(p++);
 264         }
 265         *q = 0;
 266         setenv("CISCO_BANNER", banner, 1);
 267
 268         free(banner);
 269 }
 270
 271 static void set_script_env(struct openconnect_info *vpninfo)
 272 {
 273         char host[80];
 274         int ret = getnameinfo(vpninfo->peer_addr, vpninfo->peer_addrlen, host,
 275                               sizeof(host), NULL, 0, NI_NUMERICHOST);
 276         if (!ret)
 277                 setenv("VPNGATEWAY", host, 1);
 278
 279         setenv("reason", "connect", 1);
 280         set_banner(vpninfo);
 281         unsetenv("CISCO_SPLIT_INC");
 282         unsetenv("CISCO_SPLIT_EXC");
 283
 284         setenv_int("INTERNAL_IP4_MTU", vpninfo->mtu);
 285
 286         if (vpninfo->vpn_addr) {
 287                 setenv("INTERNAL_IP4_ADDRESS", vpninfo->vpn_addr, 1);
 288                 if (vpninfo->vpn_netmask) {
 289                         struct in_addr addr;
 290                         struct in_addr mask;
 291
 292                         if (inet_aton(vpninfo->vpn_addr, &addr) &&
 293                             inet_aton(vpninfo->vpn_netmask, &mask)) {
 294                                 char *netaddr;
 295
 296                                 addr.s_addr &= mask.s_addr;
 297                                 netaddr = inet_ntoa(addr);
 298
 299                                 setenv("INTERNAL_IP4_NETADDR", netaddr, 1);
 300                                 setenv("INTERNAL_IP4_NETMASK", vpninfo->vpn_netmask, 1);
 301                                 setenv_int("INTERNAL_IP4_NETMASKLEN", netmasklen(mask));
 302                         }
 303                 }
 304         }
 305         if (vpninfo->vpn_addr6) {
 306                 setenv("INTERNAL_IP6_ADDRESS", vpninfo->vpn_addr6, 1);
 307                 setenv("INTERNAL_IP6_NETMASK", vpninfo->vpn_netmask6, 1);
 308         }
 309
 310         if (vpninfo->vpn_dns[0])
 311                 setenv("INTERNAL_IP4_DNS", vpninfo->vpn_dns[0], 1);
 312         else
 313                 unsetenv("INTERNAL_IP4_DNS");
 314         if (vpninfo->vpn_dns[1])
 315                 appendenv("INTERNAL_IP4_DNS", vpninfo->vpn_dns[1]);
 316         if (vpninfo->vpn_dns[2])
 317                 appendenv("INTERNAL_IP4_DNS", vpninfo->vpn_dns[2]);
 318
 319         if (vpninfo->vpn_nbns[0])
 320                 setenv("INTERNAL_IP4_NBNS", vpninfo->vpn_nbns[0], 1);
 321         else
 322                 unsetenv("INTERNAL_IP4_NBNS");
 323         if (vpninfo->vpn_nbns[1])
 324                 appendenv("INTERNAL_IP4_NBNS", vpninfo->vpn_nbns[1]);
 325         if (vpninfo->vpn_nbns[2])
 326                 appendenv("INTERNAL_IP4_NBNS", vpninfo->vpn_nbns[2]);
 327
 328         if (vpninfo->vpn_domain)
 329                 setenv("CISCO_DEF_DOMAIN", vpninfo->vpn_domain, 1);
 330         else unsetenv ("CISCO_DEF_DOMAIN");
 331
 332         if (vpninfo->vpn_proxy_pac)
 333                 setenv("CISCO_PROXY_PAC", vpninfo->vpn_proxy_pac, 1);
 334
 335         if (vpninfo->split_includes) {
 336                 struct split_include *this = vpninfo->split_includes;
 337                 int nr_split_includes = 0;
 338                 int nr_v6_split_includes = 0;
 339
 340                 while (this) {
 341                         process_split_xxclude(vpninfo, 1, this->route,
 342                                               &nr_split_includes,
 343                                               &nr_v6_split_includes);
 344                         this = this->next;
 345                 }
 346                 if (nr_split_includes)
 347                         setenv_int("CISCO_SPLIT_INC", nr_split_includes);
 348                 if (nr_v6_split_includes)
 349                         setenv_int("CISCO_IPV6_SPLIT_INC", nr_v6_split_includes);
 350         }
 351         if (vpninfo->split_excludes) {
 352                 struct split_include *this = vpninfo->split_excludes;
 353                 int nr_split_excludes = 0;
 354                 int nr_v6_split_excludes = 0;
 355
 356                 while (this) {
 357                         process_split_xxclude(vpninfo, 0, this->route,
 358                                               &nr_split_excludes,
 359                                               &nr_v6_split_excludes);
 360                         this = this->next;
 361                 }
 362                 if (nr_split_excludes)
 363                         setenv_int("CISCO_SPLIT_EXC", nr_split_excludes);
 364                 if (nr_v6_split_excludes)
 365                         setenv_int("CISCO_IPV6_SPLIT_EXC", nr_v6_split_excludes);
 366         }
 367         setenv_cstp_opts(vpninfo);
 368 }
 369
 370 static int script_config_tun(struct openconnect_info *vpninfo)
 371 {
 372         if (system(vpninfo->vpnc_script)) {
 373                 int e = errno;
 374                 vpn_progress(vpninfo, PRG_ERR,
 375                              _("Failed to spawn script '%s': %s\n"),
 376                              vpninfo->vpnc_script, strerror(e));
 377                 return -e;
 378         }
 379         return 0;
 380 }
 381
 382 void script_reconnect (struct openconnect_info *vpninfo)
 383 {
 384         setenv("reason", "reconnect", 1);
 385         script_config_tun(vpninfo);
 386 }
 387
 388 /* Set up a tuntap device. */
 389 int setup_tun(struct openconnect_info *vpninfo)
 390 {
 391         int tun_fd;
 392
 393         set_script_env(vpninfo);
 394
 395         if (vpninfo->script_tun) {
 396                 pid_t child;
 397                 int fds[2];
 398
 399                 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, fds)) {
 400                         perror(_("socketpair"));
 401                         exit(1);
 402                 }
 403                 tun_fd = fds[0];
 404                 child = fork();
 405                 if (child < 0) {
 406                         perror(_("fork"));
 407                         exit(1);
 408                 } else if (!child) {
 409                         close(tun_fd);
 410                         setenv_int("VPNFD", fds[1]);
 411                         execl("/bin/sh", "/bin/sh", "-c", vpninfo->vpnc_script, NULL);
 412                         perror(_("execl"));
 413                         exit(1);
 414                 }
 415                 close(fds[1]);
 416                 vpninfo->script_tun = child;
 417                 vpninfo->ifname = strdup(_("(script)"));
 418         } else {
 419 #ifdef IFF_TUN /* Linux */
 420                 struct ifreq ifr;
 421                 int tunerr;
 422
 423                 tun_fd = open("/dev/net/tun", O_RDWR);
 424                 if (tun_fd < 0) {
 425                         /* Android has /dev/tun instead of /dev/net/tun
 426                            Since other systems might have too, just try it
 427                            as a fallback instead of using ifdef __ANDROID__ */
 428                         tunerr = errno;
 429                         tun_fd = open("/dev/tun", O_RDWR);
 430                 }
 431                 if (tun_fd < 0) {
 432                         /* If the error on /dev/tun is ENOENT, that's boring.
 433                            Use the error we got on /dev/net/tun instead */
 434                         if (errno != -ENOENT)
 435                                 tunerr = errno;
 436
 437                         vpn_progress(vpninfo, PRG_ERR,
 438                                      _("Failed to open tun device: %s\n"),
 439                                      strerror(tunerr));
 440                         exit(1);
 441                 }
 442                 memset(&ifr, 0, sizeof(ifr));
 443                 ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
 444                 if (vpninfo->ifname)
 445                         strncpy(ifr.ifr_name, vpninfo->ifname,
 446                                 sizeof(ifr.ifr_name) - 1);
 447                 if (ioctl(tun_fd, TUNSETIFF, (void *) &ifr) < 0) {
 448                         vpn_progress(vpninfo, PRG_ERR,
 449                                      _("TUNSETIFF failed: %s\n"),
 450                                      strerror(errno));
 451                         exit(1);
 452                 }
 453                 if (!vpninfo->ifname)
 454                         vpninfo->ifname = strdup(ifr.ifr_name);
 455 #elif defined (__sun__)
 456                 static char tun_name[80];
 457                 int tun2_fd, ip_fd = open("/dev/ip", O_RDWR);
 458                 int unit_nr, mux_id;
 459                 struct ifreq ifr;
 460
 461                 if (ip_fd < 0) {
 462                         perror(_("open /dev/ip"));
 463                         return -EIO;
 464                 }
 465
 466                 tun_fd = open("/dev/tun", O_RDWR);
 467                 if (tun_fd < 0) {
 468                         perror(_("open /dev/tun"));
 469                         close(ip_fd);
 470                         return -EIO;
 471                 }
 472
 473                 unit_nr = ioctl(tun_fd, TUNNEWPPA, -1);
 474                 if (unit_nr < 0) {
 475                         perror(_("Failed to create new tun"));
 476                         close(tun_fd);
 477                         close(ip_fd);
 478                         return -EIO;
 479                 }
 480
 481                 tun2_fd = open("/dev/tun", O_RDWR);
 482                 if (tun2_fd < 0) {
 483                         perror(_("open /dev/tun again"));
 484                         close(tun_fd);
 485                         close(ip_fd);
 486                         return -EIO;
 487                 }
 488                 if (ioctl(tun2_fd, I_PUSH, "ip") < 0) {
 489                         perror(_("Can't push IP"));
 490                         close(tun2_fd);
 491                         close(tun_fd);
 492                         close(ip_fd);
 493                         return -EIO;
 494                 }
 495                 if (ioctl(tun2_fd, IF_UNITSEL, &unit_nr) < 0) {
 496                         perror(_("Can't select unit"));
 497                         close(tun2_fd);
 498                         close(tun_fd);
 499                         close(ip_fd);
 500                         return -EIO;
 501                 }
 502                 mux_id = ioctl(ip_fd, I_PLINK, tun2_fd);
 503                 if (mux_id < 0) {
 504                         perror(_("Can't link tun to IP"));
 505                         close(tun2_fd);
 506                         close(tun_fd);
 507                         close(ip_fd);
 508                         return -EIO;
 509                 }
 510                 close(tun2_fd);
 511
 512                 sprintf(tun_name, "tun%d", unit_nr);
 513                 vpninfo->ifname = strdup(tun_name);
 514
 515                 memset(&ifr, 0, sizeof(ifr));
 516                 strcpy(ifr.ifr_name, tun_name);
 517                 ifr.ifr_ip_muxid = mux_id;
 518
 519                 if (ioctl(ip_fd, SIOCSIFMUXID, &ifr) < 0) {
 520                         perror(_("Set mux id"));
 521                         close(tun_fd);
 522                         ioctl(ip_fd, I_PUNLINK, mux_id);
 523                         close(ip_fd);
 524                         return -EIO;
 525                 }
 526                 /* Solaris tunctl needs this in order to tear it down */
 527                 vpn_progress(vpninfo, PRG_DEBUG, _("mux id is %d\n"), mux_id);
 528                 vpninfo->tun_muxid = mux_id;
 529                 vpninfo->ip_fd = ip_fd;
 530
 531 #else /* BSD et al have /dev/tun$x devices */
 532                 static char tun_name[80];
 533                 int i;
 534                 for (i = 0; i < 255; i++) {
 535                         sprintf(tun_name, "/dev/tun%d", i);
 536                         tun_fd = open(tun_name, O_RDWR);
 537                         if (tun_fd >= 0)
 538                                 break;
 539                 }
 540                 if (tun_fd < 0) {
 541                         perror(_("open tun"));
 542                         exit(1);
 543                 }
 544                 vpninfo->ifname = strdup(tun_name + 5);
 545 #ifdef TUNSIFHEAD
 546                 i = 1;
 547                 if (ioctl(tun_fd, TUNSIFHEAD, &i) < 0) {
 548                         perror(_("TUNSIFHEAD"));
 549                         exit(1);
 550                 }
 551 #endif
 552 #endif
 553                 if (vpninfo->vpnc_script) {
 554                         setenv("TUNDEV", vpninfo->ifname, 1);
 555                         script_config_tun(vpninfo);
 556                         /* We have to set the MTU for ourselves, because the script doesn't */
 557                         local_config_tun(vpninfo, 1);
 558                 } else
 559                         local_config_tun(vpninfo, 0);
 560         }
 561
 562         fcntl(tun_fd, F_SETFD, FD_CLOEXEC);
 563
 564         vpninfo->tun_fd = tun_fd;
 565
 566         if (vpninfo->select_nfds <= tun_fd)
 567                 vpninfo->select_nfds = tun_fd + 1;
 568
 569         FD_SET(tun_fd, &vpninfo->select_rfds);
 570
 571         fcntl(vpninfo->tun_fd, F_SETFL, fcntl(vpninfo->tun_fd, F_GETFL) | O_NONBLOCK);
 572
 573         return 0;
 574 }
 575
 576 int tun_mainloop(struct openconnect_info *vpninfo, int *timeout)
 577 {
 578         unsigned char buf[2000];
 579         int len;
 580         int work_done = 0;
 581
 582         if (FD_ISSET(vpninfo->tun_fd, &vpninfo->select_rfds)) {
 583                 while ((len = read(vpninfo->tun_fd, buf, sizeof(buf))) > 0) {
 584                         unsigned char *pkt = buf;
 585 #ifdef TUN_HAS_AF_PREFIX
 586                         if (!vpninfo->script_tun) {
 587                                 pkt += 4;
 588                                 len -= 4;
 589                         }
 590 #endif
 591                         if (queue_new_packet(&vpninfo->outgoing_queue, pkt,
 592                                              len))
 593                                 break;
 594
 595                         work_done = 1;
 596                         vpninfo->outgoing_qlen++;
 597                         if (vpninfo->outgoing_qlen == vpninfo->max_qlen) {
 598                                 FD_CLR(vpninfo->tun_fd, &vpninfo->select_rfds);
 599                                 break;
 600                         }
 601                 }
 602         } else if (vpninfo->outgoing_qlen < vpninfo->max_qlen) {
 603                 FD_SET(vpninfo->tun_fd, &vpninfo->select_rfds);
 604         }
 605
 606         /* The kernel returns -ENOMEM when the queue is full, so theoretically
 607            we could handle that and retry... but it doesn't let us poll() for
 608            the no-longer-full situation, so let's not bother. */
 609         while (vpninfo->incoming_queue) {
 610                 struct pkt *this = vpninfo->incoming_queue;
 611                 unsigned char *data = this->data;
 612                 int len = this->len;
 613
 614 #ifdef TUN_HAS_AF_PREFIX
 615                 if (!vpninfo->script_tun) {
 616                         struct ip *iph = (void *)data;
 617                         int type;
 618
 619                         if (iph->ip_v == 6)
 620                                 type = AF_INET6;
 621                         else if (iph->ip_v == 4)
 622                                 type = AF_INET;
 623                         else {
 624                                 static int complained = 0;
 625                                 if (!complained) {
 626                                         complained = 1;
 627                                         vpn_progress(vpninfo, PRG_ERR,
 628                                                      _("Unknown packet (len %d) received: %02x %02x %02x %02x...\n"),
 629                                                      len, data[0], data[1], data[2], data[3]);
 630                                 }
 631                                 free(this);
 632                                 continue;
 633                         }
 634                         data -= 4;
 635                         len += 4;
 636                         *(int *)data = htonl(type);
 637                 }
 638 #endif
 639                 vpninfo->incoming_queue = this->next;
 640
 641                 if (write(vpninfo->tun_fd, data, len) < 0 &&
 642                     errno == ENOTCONN) {
 643                         vpninfo->quit_reason = "Client connection terminated";
 644                         return 1;
 645                 }
 646                 free(this);
 647         }
 648         /* Work is not done if we just got rid of packets off the queue */
 649         return work_done;
 650 }
 651
 652 void shutdown_tun(struct openconnect_info *vpninfo)
 653 {
 654         if (vpninfo->script_tun) {
 655                 kill(vpninfo->script_tun, SIGHUP);
 656         } else {
 657                 if (vpninfo->vpnc_script) {
 658                         setenv("reason", "disconnect", 1);
 659                         if (system(vpninfo->vpnc_script) == -1) {
 660                                 vpn_progress(vpninfo, PRG_ERR,
 661                                              _("Failed to spawn script '%s': %s\n"),
 662                                              vpninfo->vpnc_script,
 663                                              strerror(errno));
 664                         }
 665                 }
 666 #ifdef __sun__
 667                 if (ioctl(vpninfo->ip_fd, I_PUNLINK, vpninfo->tun_muxid) < 0)
 668                         perror(_("ioctl(I_PUNLINK)"));
 669
 670                 close(vpninfo->ip_fd);
 671                 vpninfo->ip_fd = -1;
 672 #endif
 673         }
 674
 675         close(vpninfo->tun_fd);
 676         vpninfo->tun_fd = -1;
 677 }