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