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
28 #include <sys/select.h>
30 #include <arpa/inet.h>
33 #include "openconnect.h"
35 void queue_packet(struct pkt **q, struct pkt *new)
44 int queue_new_packet(struct pkt **q, int type, void *buf, int len)
46 struct pkt *new = malloc(sizeof(struct pkt) + len);
53 memcpy(new->data, buf, len);
60 static void handle_sigint(int sig)
65 int vpn_mainloop(struct openconnect_info *vpninfo)
68 memset(&sa, 0, sizeof(sa));
69 sa.sa_handler = handle_sigint;
71 sigaction(SIGINT, &sa, NULL);
72 sigaction(SIGHUP, &sa, NULL);
74 while (!vpninfo->quit_reason) {
76 int timeout = INT_MAX;
78 fd_set rfds, wfds, efds;
80 if (vpninfo->new_dtls_ssl)
81 dtls_try_handshake(vpninfo);
83 if (vpninfo->dtls_attempt_period && !vpninfo->dtls_ssl && !vpninfo->new_dtls_ssl &&
84 vpninfo->new_dtls_started + vpninfo->dtls_attempt_period < time(NULL)) {
85 vpninfo->progress(vpninfo, PRG_TRACE, "Attempt new DTLS connection\n");
86 connect_dtls_socket(vpninfo);
88 if (vpninfo->dtls_ssl)
89 did_work += dtls_mainloop(vpninfo, &timeout);
91 if (vpninfo->quit_reason)
94 did_work += cstp_mainloop(vpninfo, &timeout);
95 if (vpninfo->quit_reason)
98 /* Tun must be last because it will set/clear its bit
99 in the select_rfds according to the queue length */
100 did_work += tun_mainloop(vpninfo, &timeout);
101 if (vpninfo->quit_reason)
105 if (killed == SIGHUP)
106 vpninfo->quit_reason = "Client received SIGHUP";
107 else if (killed == SIGINT)
108 vpninfo->quit_reason = "Client received SIGINT";
110 vpninfo->quit_reason = "Client killed";
117 vpninfo->progress(vpninfo, PRG_TRACE,
118 "Did no work; sleeping for %d ms...\n", timeout);
119 memcpy(&rfds, &vpninfo->select_rfds, sizeof(rfds));
120 memcpy(&wfds, &vpninfo->select_wfds, sizeof(wfds));
121 memcpy(&efds, &vpninfo->select_efds, sizeof(efds));
123 tv.tv_sec = timeout / 1000;
124 tv.tv_usec = (timeout % 1000) * 1000;
125 if (select(vpninfo->select_nfds, &rfds, &wfds, &efds, &tv) >= 0
126 && FD_ISSET(vpninfo->ssl_fd, &efds)) {
127 /* OpenSSL doesn't seem to cope properly with this... */
128 vpninfo->progress(vpninfo, PRG_ERR, "Server closed connection!\n");
133 cstp_bye(vpninfo, vpninfo->quit_reason);
135 if (vpninfo->vpnc_script) {
136 if (vpninfo->script_tun) {
137 kill(vpninfo->script_tun, SIGHUP);
138 close(vpninfo->tun_fd);
140 setenv("TUNDEV", vpninfo->ifname, 1);
141 setenv("reason", "disconnect", 1);
142 system(vpninfo->vpnc_script);
149 /* Called when the socket is unwritable, to get the deadline for DPD.
150 Returns 1 if DPD deadline has already arrived. */
151 int ka_stalled_dpd_time(struct keepalive_info *ka, int *timeout)
159 due = ka->last_rx + (2 * ka->dpd);
164 if (*timeout > (due - now) * 1000)
165 *timeout = (due - now) * 1000;
171 int keepalive_action(struct keepalive_info *ka, int *timeout)
173 time_t now = time(NULL);
176 time_t due = ka->last_rekey + ka->rekey;
181 if (*timeout > (due - now) * 1000)
182 *timeout = (due - now) * 1000;
185 /* DPD is bidirectional -- PKT 3 out, PKT 4 back */
187 time_t due = ka->last_rx + ka->dpd;
188 time_t overdue = ka->last_rx + (2 * ka->dpd);
190 /* Peer didn't respond */
194 /* If we already have DPD outstanding, don't flood. Repeat by
195 all means, but only after half the DPD period. */
196 if (ka->last_dpd > ka->last_rx)
197 due = ka->last_dpd + ka->dpd / 2;
199 /* We haven't seen a packet from this host for $DPD seconds.
200 Prod it to see if it's still alive */
205 if (*timeout > (due - now) * 1000)
206 *timeout = (due - now) * 1000;
209 /* Keepalive is just client -> server */
211 time_t due = ka->last_tx + ka->keepalive;
213 /* If we haven't sent anything for $KEEPALIVE seconds, send a
214 dummy packet (which the server will discard) */
218 if (*timeout > (due - now) * 1000)
219 *timeout = (due - now) * 1000;