2 device.c -- UML network socket
3 Copyright (C) 2002-2005 Ivo Timmermans,
4 2002-2009 Guus Sliepen <guus@tinc-vpn.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 static int listen_fd = -1;
33 static int request_fd = -1;
34 static int data_fd = -1;
35 static int write_fd = -1;
39 static char *device_info;
41 extern char *identname;
44 static int device_total_in = 0;
45 static int device_total_out = 0;
47 enum request_type { REQ_NEW_CONTROL };
49 static struct request {
52 enum request_type type;
53 struct sockaddr_un sock;
56 static struct sockaddr_un data_sun;
58 bool setup_device(void) {
59 struct sockaddr_un listen_sun;
60 static const int one = 1;
68 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
69 xasprintf(&device, LOCALSTATEDIR "/run/%s.umlsocket", identname);
71 get_config_string(lookup_config(config_tree, "Interface"), &iface);
73 device_info = "UML network socket";
75 if((write_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
76 logger(LOG_ERR, "Could not open write %s: %s", device_info, strerror(errno));
81 setsockopt(write_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
83 if(fcntl(write_fd, F_SETFL, O_NONBLOCK) < 0) {
84 logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
89 if((data_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
90 logger(LOG_ERR, "Could not open data %s: %s", device_info, strerror(errno));
95 setsockopt(data_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
97 if(fcntl(data_fd, F_SETFL, O_NONBLOCK) < 0) {
98 logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
105 gettimeofday(&tv, NULL);
106 name.usecs = tv.tv_usec;
107 data_sun.sun_family = AF_UNIX;
108 memcpy(&data_sun.sun_path, &name, sizeof name);
110 if(bind(data_fd, (struct sockaddr *)&data_sun, sizeof data_sun) < 0) {
111 logger(LOG_ERR, "Could not bind data %s: %s", device_info, strerror(errno));
116 if((listen_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
117 logger(LOG_ERR, "Could not open %s: %s", device_info,
122 setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
124 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
125 logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
129 listen_sun.sun_family = AF_UNIX;
130 strncpy(listen_sun.sun_path, device, sizeof listen_sun.sun_path);
131 if(bind(listen_fd, (struct sockaddr *)&listen_sun, sizeof listen_sun) < 0) {
132 logger(LOG_ERR, "Could not bind %s to %s: %s", device_info, device, strerror(errno));
136 if(listen(listen_fd, 1) < 0) {
137 logger(LOG_ERR, "Could not listen on %s %s: %s", device_info, device, strerror(errno));
141 device_fd = listen_fd;
144 logger(LOG_INFO, "%s is a %s", device, device_info);
146 if(routing_mode == RMODE_ROUTER)
147 overwrite_mac = true;
152 void close_device(void) {
168 if(iface) free(iface);
171 bool read_packet(vpn_packet_t *packet) {
177 int salen = sizeof sa;
179 request_fd = accept(listen_fd, &sa, &salen);
181 logger(LOG_ERR, "Could not accept connection to %s %s: %s", device_info, device, strerror(errno));
185 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
186 logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
193 device_fd = request_fd;
200 if((lenin = read(request_fd, &request, sizeof request)) != sizeof request) {
201 logger(LOG_ERR, "Error while reading request from %s %s: %s", device_info,
202 device, strerror(errno));
207 if(request.magic != 0xfeedface || request.version != 3 || request.type != REQ_NEW_CONTROL) {
208 logger(LOG_ERR, "Unknown magic %x, version %d, request type %d from %s %s",
209 request.magic, request.version, request.type, device_info, device);
214 if(connect(write_fd, &request.sock, sizeof request.sock) < 0) {
215 logger(LOG_ERR, "Could not bind write %s: %s", device_info, strerror(errno));
220 write(request_fd, &data_sun, sizeof data_sun);
223 logger(LOG_INFO, "Connection with UML established");
230 if((lenin = read(data_fd, packet->data, MTU)) <= 0) {
231 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
232 device, strerror(errno));
239 device_total_in += packet->len;
241 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
249 bool write_packet(vpn_packet_t *packet) {
251 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Dropping packet of %d bytes to %s: not connected to UML yet",
252 packet->len, device_info);
256 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
257 packet->len, device_info);
259 if(write(write_fd, packet->data, packet->len) < 0) {
260 if(errno != EINTR && errno != EAGAIN) {
261 logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
268 device_total_out += packet->len;
273 void dump_device_stats(void) {
274 logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
275 logger(LOG_DEBUG, " total bytes in: %10d", device_total_in);
276 logger(LOG_DEBUG, " total bytes out: %10d", device_total_out);