2 device.c -- UML network socket
3 Copyright (C) 2002-2005 Ivo Timmermans,
4 2002-2013 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.
34 static int listen_fd = -1;
35 static int request_fd = -1;
36 static int data_fd = -1;
37 static int write_fd = -1;
39 static char *device_info;
41 enum request_type { REQ_NEW_CONTROL };
43 static struct request {
46 enum request_type type;
47 struct sockaddr_un sock;
50 static struct sockaddr_un data_sun;
52 static bool setup_device(void) {
53 struct sockaddr_un listen_sun;
54 static const int one = 1;
62 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
63 xasprintf(&device, LOCALSTATEDIR "/run/%s.umlsocket", identname);
65 get_config_string(lookup_config(config_tree, "Interface"), &iface);
67 device_info = "UML network socket";
69 if((write_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
70 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open write %s: %s", device_info, strerror(errno));
76 fcntl(write_fd, F_SETFD, FD_CLOEXEC);
79 setsockopt(write_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
81 if(fcntl(write_fd, F_SETFL, O_NONBLOCK) < 0) {
82 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
87 if((data_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
88 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open data %s: %s", device_info, strerror(errno));
94 fcntl(data_fd, F_SETFD, FD_CLOEXEC);
97 setsockopt(data_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
99 if(fcntl(data_fd, F_SETFL, O_NONBLOCK) < 0) {
100 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
107 gettimeofday(&tv, NULL);
108 name.usecs = tv.tv_usec;
109 data_sun.sun_family = AF_UNIX;
110 memcpy(&data_sun.sun_path, &name, sizeof name);
112 if(bind(data_fd, (struct sockaddr *)&data_sun, sizeof data_sun) < 0) {
113 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind data %s: %s", device_info, strerror(errno));
118 if((listen_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
119 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", device_info,
125 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
128 setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
130 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
131 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
135 listen_sun.sun_family = AF_UNIX;
136 strncpy(listen_sun.sun_path, device, sizeof listen_sun.sun_path);
137 if(bind(listen_fd, (struct sockaddr *)&listen_sun, sizeof listen_sun) < 0) {
138 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind %s to %s: %s", device_info, device, strerror(errno));
142 if(listen(listen_fd, 1) < 0) {
143 logger(DEBUG_ALWAYS, LOG_ERR, "Could not listen on %s %s: %s", device_info, device, strerror(errno));
147 device_fd = listen_fd;
150 logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
152 if(routing_mode == RMODE_ROUTER)
153 overwrite_mac = true;
158 void close_device(void) {
160 close(listen_fd); listen_fd = -1;
163 if(request_fd >= 0) {
164 close(request_fd); request_fd = -1;
168 close(data_fd); data_fd = -1;
172 close(write_fd); write_fd = -1;
177 free(device); device = NULL;
179 free(iface); iface = NULL;
184 static bool read_packet(vpn_packet_t *packet) {
190 socklen_t salen = sizeof sa;
192 request_fd = accept(listen_fd, &sa, &salen);
194 logger(DEBUG_ALWAYS, LOG_ERR, "Could not accept connection to %s %s: %s", device_info, device, strerror(errno));
199 fcntl(request_fd, F_SETFD, FD_CLOEXEC);
202 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
203 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
210 device_fd = request_fd;
217 if((inlen = read(request_fd, &request, sizeof request)) != sizeof request) {
218 logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading request from %s %s: %s", device_info,
219 device, strerror(errno));
224 if(request.magic != 0xfeedface || request.version != 3 || request.type != REQ_NEW_CONTROL) {
225 logger(DEBUG_ALWAYS, LOG_ERR, "Unknown magic %x, version %d, request type %d from %s %s",
226 request.magic, request.version, request.type, device_info, device);
231 if(connect(write_fd, &request.sock, sizeof request.sock) < 0) {
232 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind write %s: %s", device_info, strerror(errno));
237 write(request_fd, &data_sun, sizeof data_sun);
240 logger(DEBUG_ALWAYS, LOG_INFO, "Connection with UML established");
247 if((inlen = read(data_fd, packet->data, MTU)) <= 0) {
248 logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
249 device, strerror(errno));
256 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
263 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid value for state variable in " __FILE__);
268 static bool write_packet(vpn_packet_t *packet) {
270 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Dropping packet of %d bytes to %s: not connected to UML yet",
271 packet->len, device_info);
275 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s",
276 packet->len, device_info);
278 if(write(write_fd, packet->data, packet->len) < 0) {
279 if(errno != EINTR && errno != EAGAIN) {
280 logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
290 const devops_t uml_devops = {
291 .setup = setup_device,
292 .close = close_device,
294 .write = write_packet,