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
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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)
60 struct sockaddr_un listen_sun;
61 static const int one = 1;
71 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
72 xasprintf(&device, LOCALSTATEDIR "/run/%s.umlsocket", identname);
74 get_config_string(lookup_config(config_tree, "Interface"), &iface);
76 device_info = _("UML network socket");
78 if((write_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
79 logger(LOG_ERR, _("Could not open write %s: %s"), device_info, strerror(errno));
84 setsockopt(write_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
86 if(fcntl(write_fd, F_SETFL, O_NONBLOCK) < 0) {
87 logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl", strerror(errno));
92 if((data_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
93 logger(LOG_ERR, _("Could not open data %s: %s"), device_info, strerror(errno));
98 setsockopt(data_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
100 if(fcntl(data_fd, F_SETFL, O_NONBLOCK) < 0) {
101 logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl", strerror(errno));
108 gettimeofday(&tv, NULL);
109 name.usecs = tv.tv_usec;
110 data_sun.sun_family = AF_UNIX;
111 memcpy(&data_sun.sun_path, &name, sizeof name);
113 if(bind(data_fd, (struct sockaddr *)&data_sun, sizeof data_sun) < 0) {
114 logger(LOG_ERR, _("Could not bind data %s: %s"), device_info, strerror(errno));
119 if((listen_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
120 logger(LOG_ERR, _("Could not open %s: %s"), device_info,
125 setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
127 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
128 logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl", strerror(errno));
132 listen_sun.sun_family = AF_UNIX;
133 strncpy(listen_sun.sun_path, device, sizeof listen_sun.sun_path);
134 if(bind(listen_fd, (struct sockaddr *)&listen_sun, sizeof listen_sun) < 0) {
135 logger(LOG_ERR, _("Could not bind %s to %s: %s"), device_info, device, strerror(errno));
139 if(listen(listen_fd, 1) < 0) {
140 logger(LOG_ERR, _("Could not listen on %s %s: %s"), device_info, device, strerror(errno));
144 device_fd = listen_fd;
147 logger(LOG_INFO, _("%s is a %s"), device, device_info);
149 if(routing_mode == RMODE_ROUTER)
150 overwrite_mac = true;
155 void close_device(void)
174 if(iface) free(iface);
177 bool read_packet(vpn_packet_t *packet)
186 int salen = sizeof sa;
188 request_fd = accept(listen_fd, &sa, &salen);
190 logger(LOG_ERR, _("Could not accept connection to %s %s: %s"), device_info, device, strerror(errno));
194 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
195 logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl", strerror(errno));
202 device_fd = request_fd;
209 if((lenin = read(request_fd, &request, sizeof request)) != sizeof request) {
210 logger(LOG_ERR, _("Error while reading request from %s %s: %s"), device_info,
211 device, strerror(errno));
216 if(request.magic != 0xfeedface || request.version != 3 || request.type != REQ_NEW_CONTROL) {
217 logger(LOG_ERR, _("Unknown magic %x, version %d, request type %d from %s %s"),
218 request.magic, request.version, request.type, device_info, device);
223 if(connect(write_fd, &request.sock, sizeof request.sock) < 0) {
224 logger(LOG_ERR, _("Could not bind write %s: %s"), device_info, strerror(errno));
229 write(request_fd, &data_sun, sizeof data_sun);
232 logger(LOG_INFO, _("Connection with UML established"));
239 if((lenin = read(data_fd, packet->data, MTU)) <= 0) {
240 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
241 device, strerror(errno));
248 device_total_in += packet->len;
250 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
258 bool write_packet(vpn_packet_t *packet)
263 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Dropping packet of %d bytes to %s: not connected to UML yet"),
264 packet->len, device_info);
268 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
269 packet->len, device_info);
271 if(write(write_fd, packet->data, packet->len) < 0) {
272 if(errno != EINTR && errno != EAGAIN) {
273 logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device, strerror(errno));
280 device_total_out += packet->len;
285 void dump_device_stats(void)
289 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
290 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
291 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);