2 device.c -- UML network socket
3 Copyright (C) 2002-2005 Ivo Timmermans,
4 2002-2012 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.
33 static int listen_fd = -1;
34 static int request_fd = -1;
35 static int data_fd = -1;
36 static int write_fd = -1;
38 static char *device_info;
40 extern char *identname;
41 extern volatile bool running;
43 static uint64_t device_total_in = 0;
44 static uint64_t device_total_out = 0;
46 enum request_type { REQ_NEW_CONTROL };
48 static struct request {
51 enum request_type type;
52 struct sockaddr_un sock;
55 static struct sockaddr_un data_sun;
57 static bool setup_device(void) {
58 struct sockaddr_un listen_sun;
59 static const int one = 1;
67 if(!get_config_string(lookup_config(config_tree, "Device"), &device)) {
68 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));
82 fcntl(write_fd, F_SETFD, FD_CLOEXEC);
85 setsockopt(write_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
87 if(fcntl(write_fd, F_SETFL, O_NONBLOCK) < 0) {
88 logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
93 if((data_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
94 logger(LOG_ERR, "Could not open data %s: %s", device_info, strerror(errno));
100 fcntl(data_fd, F_SETFD, FD_CLOEXEC);
103 setsockopt(data_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
105 if(fcntl(data_fd, F_SETFL, O_NONBLOCK) < 0) {
106 logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
113 gettimeofday(&tv, NULL);
114 name.usecs = tv.tv_usec;
115 data_sun.sun_family = AF_UNIX;
116 memcpy(&data_sun.sun_path, &name, sizeof(name));
118 if(bind(data_fd, (struct sockaddr *)&data_sun, sizeof(data_sun)) < 0) {
119 logger(LOG_ERR, "Could not bind data %s: %s", device_info, strerror(errno));
124 if((listen_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
125 logger(LOG_ERR, "Could not open %s: %s", device_info,
131 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
134 setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
136 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
137 logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
141 listen_sun.sun_family = AF_UNIX;
142 strncpy(listen_sun.sun_path, device, sizeof(listen_sun.sun_path));
144 if(bind(listen_fd, (struct sockaddr *)&listen_sun, sizeof(listen_sun)) < 0) {
145 logger(LOG_ERR, "Could not bind %s to %s: %s", device_info, device, strerror(errno));
149 if(listen(listen_fd, 1) < 0) {
150 logger(LOG_ERR, "Could not listen on %s %s: %s", device_info, device, strerror(errno));
154 device_fd = listen_fd;
157 logger(LOG_INFO, "%s is a %s", device, device_info);
159 if(routing_mode == RMODE_ROUTER) {
160 overwrite_mac = true;
166 void close_device(void) {
171 if(request_fd >= 0) {
192 static bool read_packet(vpn_packet_t *packet) {
198 socklen_t salen = sizeof(sa);
200 request_fd = accept(listen_fd, &sa, &salen);
203 logger(LOG_ERR, "Could not accept connection to %s %s: %s", device_info, device, strerror(errno));
208 fcntl(request_fd, F_SETFD, FD_CLOEXEC);
211 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
212 logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
219 device_fd = request_fd;
226 if((lenin = read(request_fd, &request, sizeof(request))) != sizeof request) {
227 logger(LOG_ERR, "Error while reading request from %s %s: %s", device_info,
228 device, strerror(errno));
233 if(request.magic != 0xfeedface || request.version != 3 || request.type != REQ_NEW_CONTROL) {
234 logger(LOG_ERR, "Unknown magic %x, version %d, request type %d from %s %s",
235 request.magic, request.version, request.type, device_info, device);
240 if(connect(write_fd, &request.sock, sizeof(request.sock)) < 0) {
241 logger(LOG_ERR, "Could not bind write %s: %s", device_info, strerror(errno));
246 write(request_fd, &data_sun, sizeof(data_sun));
249 logger(LOG_INFO, "Connection with UML established");
256 if((lenin = read(data_fd, packet->data, MTU)) <= 0) {
257 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
258 device, strerror(errno));
265 device_total_in += packet->len;
267 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
274 logger(LOG_ERR, "Invalid value for state variable in " FILE);
279 static bool write_packet(vpn_packet_t *packet) {
281 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Dropping packet of %d bytes to %s: not connected to UML yet",
282 packet->len, device_info);
286 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
287 packet->len, device_info);
289 if(write(write_fd, packet->data, packet->len) < 0) {
290 if(errno != EINTR && errno != EAGAIN) {
291 logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
298 device_total_out += packet->len;
303 static void dump_device_stats(void) {
304 logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
305 logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
306 logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
309 const devops_t uml_devops = {
310 .setup = setup_device,
311 .close = close_device,
313 .write = write_packet,
314 .dump_stats = dump_device_stats,