2 * OpenConnect (SSL + DTLS) VPN client
4 * Copyright © 2008 Intel Corporation.
6 * Author: David Woodhouse <dwmw2@infradead.org>
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.
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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to:
20 * Free Software Foundation, Inc.
21 * 51 Franklin Street, Fifth Floor,
22 * Boston, MA 02110-1301 USA
26 #include <sys/socket.h>
28 #include <sys/ioctl.h>
30 #include <linux/if_tun.h>
32 #include <sys/types.h>
36 #include <netinet/in.h>
37 #include <arpa/inet.h>
40 #include "openconnect.h"
42 static int local_config_tun(struct openconnect_info *vpninfo, int mtu_only)
47 net_fd = socket(PF_INET, SOCK_DGRAM, 0);
52 memset(&ifr, 0, sizeof(ifr));
53 strncpy(ifr.ifr_name, vpninfo->ifname, sizeof(ifr.ifr_name) - 1);
56 struct sockaddr_in *addr = (struct sockaddr_in *) &ifr.ifr_addr;
58 if (ioctl(net_fd, SIOCGIFFLAGS, &ifr) < 0)
59 perror("SIOCGIFFLAGS");
61 ifr.ifr_flags |= IFF_UP | IFF_POINTOPOINT;
62 if (ioctl(net_fd, SIOCSIFFLAGS, &ifr) < 0)
63 perror("SIOCSIFFLAGS");
65 addr->sin_family = AF_INET;
66 addr->sin_addr.s_addr = inet_addr(vpninfo->vpn_addr);
67 if (ioctl(net_fd, SIOCSIFADDR, &ifr) < 0)
68 perror("SIOCSIFADDR");
71 ifr.ifr_mtu = vpninfo->mtu;
72 if (ioctl(net_fd, SIOCSIFMTU, &ifr) < 0)
80 static int setenv_int(const char *opt, int value)
83 sprintf(buf, "%d", value);
84 return setenv(opt, buf, 1);
87 static int process_split_include(struct openconnect_info *vpninfo,
88 char *route, int *nr_incs)
95 slash = strchr(route, '/');
98 vpninfo->progress(vpninfo, PRG_ERR,
99 "Discard bad split include: \"%s\"\n",
105 if (!inet_aton(route, &addr)) {
111 snprintf(envname, 79, "CISCO_SPLIT_INC_%d_ADDR", *nr_incs);
112 setenv(envname, route, 1);
114 /* Put it back how we found it */
117 if (!inet_aton(slash+1, &addr))
120 snprintf(envname, 79, "CISCO_SPLIT_INC_%d_MASK", *nr_incs);
121 setenv(envname, slash+1, 1);
123 for (masklen = 0; masklen < 32; masklen++) {
124 if (ntohl(addr.s_addr) >= (0xffffffff << masklen))
127 masklen = 32 - masklen;
129 snprintf(envname, 79, "CISCO_SPLIT_INC_%d_MASKLEN", *nr_incs);
130 setenv_int(envname, masklen);
136 static int appendenv(const char *opt, const char *new)
139 char *old = getenv(opt);
143 snprintf(buf, 1023, "%s %s", old, new);
145 snprintf(buf, 1023, "%s", new);
147 return setenv(opt, buf, 1);
150 static void set_script_env(struct openconnect_info *vpninfo)
152 struct sockaddr_in *sin = (void *)vpninfo->peer_addr;
154 setenv("VPNGATEWAY", inet_ntoa(sin->sin_addr), 1);
155 setenv("TUNDEV", vpninfo->ifname, 1);
156 setenv("reason", "connect", 1);
157 unsetenv("CISCO_BANNER");
158 unsetenv("CISCO_SPLIT_INC");
160 setenv_int("INTERNAL_IP4_MTU", vpninfo->mtu);
162 setenv("INTERNAL_IP4_ADDRESS", vpninfo->vpn_addr, 1);
163 setenv("INTERNAL_IP4_NETMASK", vpninfo->vpn_netmask, 1);
165 if (vpninfo->vpn_dns[0])
166 setenv("INTERNAL_IP4_DNS", vpninfo->vpn_dns[0], 1);
168 unsetenv("INTERNAL_IP4_DNS");
169 if (vpninfo->vpn_dns[1])
170 appendenv("INTERNAL_IP4_DNS", vpninfo->vpn_dns[1]);
171 if (vpninfo->vpn_dns[2])
172 appendenv("INTERNAL_IP4_DNS", vpninfo->vpn_dns[2]);
174 if (vpninfo->vpn_nbns[0])
175 setenv("INTERNAL_IP4_NBNS", vpninfo->vpn_nbns[0], 1);
177 unsetenv("INTERNAL_IP4_NBNS");
178 if (vpninfo->vpn_nbns[1])
179 appendenv("INTERNAL_IP4_NBNS", vpninfo->vpn_nbns[1]);
180 if (vpninfo->vpn_nbns[2])
181 appendenv("INTERNAL_IP4_NBNS", vpninfo->vpn_nbns[2]);
183 if (vpninfo->vpn_domain)
184 setenv("CISCO_DEF_DOMAIN", vpninfo->vpn_domain, 1);
185 else unsetenv ("CISCO_DEF_DOMAIN");
187 if (vpninfo->split_includes) {
188 struct split_include *this = vpninfo->split_includes;
189 int nr_split_includes = 0;
192 process_split_include(vpninfo, this->route,
196 setenv_int("CISCO_SPLIT_INC", nr_split_includes);
202 static int script_config_tun(struct openconnect_info *vpninfo)
204 if (vpninfo->peer_addr->sa_family != AF_INET) {
205 vpninfo->progress(vpninfo, PRG_ERR, "Script cannot handle anything but Legacy IP\n");
209 set_script_env(vpninfo);
211 system(vpninfo->vpnc_script);
216 /* Set up a tuntap device. */
217 int setup_tun(struct openconnect_info *vpninfo)
222 if (vpninfo->script_tun) {
226 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, fds)) {
227 perror("socketpair");
237 setenv_int("VPNFD", fds[1]);
238 execl("/bin/sh", "/bin/sh", "-c", vpninfo->vpnc_script, NULL);
243 vpninfo->script_tun = child;
244 vpninfo->ifname = "(script)";
247 static char tun_name[80];
249 for (i=0; i < 255; i++) {
250 sprintf(tun_name, "/dev/tun%d", i);
251 tun_fd = open(tun_name, O_RDWR);
259 vpninfo->ifname = tun_name + 5;
262 tun_fd = open("/dev/net/tun", O_RDWR);
264 vpninfo->progress(vpninfo, PRG_ERR,
265 "Failed to open tun device: %s\n",
269 memset(&ifr, 0, sizeof(ifr));
270 ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
272 strncpy(ifr.ifr_name, vpninfo->ifname,
273 sizeof(ifr.ifr_name) - 1);
274 if (ioctl(tun_fd, TUNSETIFF, (void *) &ifr) < 0) {
275 vpninfo->progress(vpninfo, PRG_ERR,
276 "TUNSETIFF failed: %s\n",
280 if (!vpninfo->ifname)
281 vpninfo->ifname = strdup(ifr.ifr_name);
284 if (vpninfo->vpnc_script) {
285 script_config_tun(vpninfo);
286 /* We have to set the MTU for ourselves, because the script doesn't */
287 local_config_tun(vpninfo, 1);
289 local_config_tun(vpninfo, 0);
292 fcntl(tun_fd, F_SETFD, FD_CLOEXEC);
294 vpninfo->tun_fd = tun_fd;
296 if (vpninfo->select_nfds <= tun_fd)
297 vpninfo->select_nfds = tun_fd + 1;
299 FD_SET(tun_fd, &vpninfo->select_rfds);
301 fcntl(vpninfo->tun_fd, F_SETFL, fcntl(vpninfo->tun_fd, F_GETFL) | O_NONBLOCK);
306 int tun_mainloop(struct openconnect_info *vpninfo, int *timeout)
312 if (FD_ISSET(vpninfo->tun_fd, &vpninfo->select_rfds)) {
313 while ((len = read(vpninfo->tun_fd, buf, sizeof(buf))) > 0) {
314 if (queue_new_packet(&vpninfo->outgoing_queue, AF_INET, buf, len))
318 vpninfo->outgoing_qlen++;
319 if (vpninfo->outgoing_qlen == vpninfo->max_qlen) {
320 FD_CLR(vpninfo->tun_fd, &vpninfo->select_rfds);
324 } else if (vpninfo->outgoing_qlen < vpninfo->max_qlen) {
325 FD_SET(vpninfo->tun_fd, &vpninfo->select_rfds);
328 /* The kernel returns -ENOMEM when the queue is full, so theoretically
329 we could handle that and retry... but it doesn't let us poll() for
330 the no-longer-full situation, so let's not bother. */
331 while (vpninfo->incoming_queue) {
332 struct pkt *this = vpninfo->incoming_queue;
333 vpninfo->incoming_queue = this->next;
334 if (write(vpninfo->tun_fd, this->data, this->len) < 0 &&
336 vpninfo->quit_reason = "Client connection terminated";
340 /* Work is not done if we just got rid of packets off the queue */