2 * Open AnyConnect (SSL + DTLS) client
4 * © 2008 David Woodhouse <dwmw2@infradead.org>
6 * Permission to use, copy, modify, and/or distribute this software
7 * for any purpose with or without fee is hereby granted, provided
8 * that the above copyright notice and this permission notice appear
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
12 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
13 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
14 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
15 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
16 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
17 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
18 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 #include <sys/ioctl.h>
24 #include <linux/if_tun.h>
25 #include <sys/types.h>
29 #include <netinet/in.h>
30 #include <arpa/inet.h>
32 #include "anyconnect.h"
34 /* Set up a tuntap device. */
35 int setup_tun(struct anyconnect_info *vpninfo)
37 struct vpn_option *cstp_opt = vpninfo->cstp_options;
39 struct sockaddr_in *addr;
43 tun_fd = open("/dev/net/tun", O_RDWR);
48 memset(&ifr, 0, sizeof(ifr));
49 ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
50 strncpy(ifr.ifr_name, vpninfo->ifname, sizeof(ifr.ifr_name) - 1);
51 if (ioctl(tun_fd, TUNSETIFF, (void *) &ifr) < 0) {
56 fcntl(tun_fd, F_SETFD, FD_CLOEXEC);
58 net_fd = socket(PF_INET, SOCK_DGRAM, 0);
63 memset(&ifr, 0, sizeof(ifr));
64 strncpy(ifr.ifr_name, vpninfo->ifname, sizeof(ifr.ifr_name) - 1);
65 if (ioctl(net_fd, SIOCGIFFLAGS, &ifr) < 0)
66 perror("SIOCGIFFLAGS");
67 ifr.ifr_flags |= IFF_UP;
68 if (ioctl(net_fd, SIOCSIFFLAGS, &ifr) < 0)
69 perror("SIOCSIFFLAGS");
71 addr = (struct sockaddr_in *) &ifr.ifr_addr;
73 printf("CSTP option %s : %s\n", cstp_opt->option, cstp_opt->value);
74 if (!strcmp(cstp_opt->option, "X-CSTP-Address")) {
75 addr->sin_family = AF_INET;
76 addr->sin_addr.s_addr = inet_addr(cstp_opt->value);
77 if (ioctl(net_fd, SIOCSIFADDR, &ifr) < 0)
78 perror("SIOCSIFADDR");
79 } else if (!strcmp(cstp_opt->option, "X-CSTP-Netmask")) {
80 addr->sin_family = AF_INET;
81 addr->sin_addr.s_addr = inet_addr(cstp_opt->value);
82 if (ioctl(net_fd, SIOCSIFNETMASK, &ifr) < 0)
83 perror("SIOCSIFNETMASK");
84 } else if (!strcmp(cstp_opt->option, "X-CSTP-MTU")) {
85 ifr.ifr_mtu = atol(cstp_opt->value);
86 if (ioctl(net_fd, SIOCSIFMTU, &ifr) < 0)
89 cstp_opt = cstp_opt->next;
94 /* Better still, use lwip and just provide a SOCKS server rather than
95 telling the kernel about it at all */
96 vpninfo->tun_fd = tun_fd;
97 pfd = vpn_add_pollfd(vpninfo, vpninfo->tun_fd, POLLIN);
99 fcntl(vpninfo->tun_fd, F_SETFL, fcntl(vpninfo->tun_fd, F_GETFL) | O_NONBLOCK);
104 int tun_mainloop(struct anyconnect_info *vpninfo, int *timeout)
110 while ( (len = read(vpninfo->tun_fd, buf, sizeof(buf))) > 0) {
111 queue_new_packet(&vpninfo->outgoing_queue, AF_INET, buf, len);
115 /* The kernel returns -ENOMEM when the queue is full, so theoretically
116 we could handle that and retry... but it doesn't let us poll() for
117 the no-longer-full situation, so let's not bother. */
118 while (vpninfo->incoming_queue) {
119 struct pkt *this = vpninfo->incoming_queue;
120 vpninfo->incoming_queue = this->next;
121 write(vpninfo->tun_fd, this->data, this->len);
123 /* Work is not done if we just got rid of packets off the queue */