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 static uint64_t device_total_in = 0;
42 static uint64_t device_total_out = 0;
44 enum request_type { REQ_NEW_CONTROL };
46 static struct request {
49 enum request_type type;
50 struct sockaddr_un sock;
53 static struct sockaddr_un data_sun;
55 static bool setup_device(void) {
56 struct sockaddr_un listen_sun;
57 static const int one = 1;
65 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
66 xasprintf(&device, LOCALSTATEDIR "/run/%s.umlsocket", identname);
68 get_config_string(lookup_config(config_tree, "Interface"), &iface);
70 device_info = "UML network socket";
72 if((write_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
73 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open write %s: %s", device_info, strerror(errno));
79 fcntl(write_fd, F_SETFD, FD_CLOEXEC);
82 setsockopt(write_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
84 if(fcntl(write_fd, F_SETFL, O_NONBLOCK) < 0) {
85 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
90 if((data_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
91 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open data %s: %s", device_info, strerror(errno));
97 fcntl(data_fd, F_SETFD, FD_CLOEXEC);
100 setsockopt(data_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
102 if(fcntl(data_fd, F_SETFL, O_NONBLOCK) < 0) {
103 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
110 gettimeofday(&tv, NULL);
111 name.usecs = tv.tv_usec;
112 data_sun.sun_family = AF_UNIX;
113 memcpy(&data_sun.sun_path, &name, sizeof name);
115 if(bind(data_fd, (struct sockaddr *)&data_sun, sizeof data_sun) < 0) {
116 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind data %s: %s", device_info, strerror(errno));
121 if((listen_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
122 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", device_info,
128 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
131 setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
133 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
134 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
138 listen_sun.sun_family = AF_UNIX;
139 strncpy(listen_sun.sun_path, device, sizeof listen_sun.sun_path);
140 if(bind(listen_fd, (struct sockaddr *)&listen_sun, sizeof listen_sun) < 0) {
141 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind %s to %s: %s", device_info, device, strerror(errno));
145 if(listen(listen_fd, 1) < 0) {
146 logger(DEBUG_ALWAYS, LOG_ERR, "Could not listen on %s %s: %s", device_info, device, strerror(errno));
150 device_fd = listen_fd;
153 logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
155 if(routing_mode == RMODE_ROUTER)
156 overwrite_mac = true;
161 void close_device(void) {
177 if(iface) free(iface);
180 static bool read_packet(vpn_packet_t *packet) {
186 socklen_t salen = sizeof sa;
188 request_fd = accept(listen_fd, &sa, &salen);
190 logger(DEBUG_ALWAYS, LOG_ERR, "Could not accept connection to %s %s: %s", device_info, device, strerror(errno));
195 fcntl(request_fd, F_SETFD, FD_CLOEXEC);
198 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
199 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
206 device_fd = request_fd;
213 if((inlen = read(request_fd, &request, sizeof request)) != sizeof request) {
214 logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading request from %s %s: %s", device_info,
215 device, strerror(errno));
220 if(request.magic != 0xfeedface || request.version != 3 || request.type != REQ_NEW_CONTROL) {
221 logger(DEBUG_ALWAYS, LOG_ERR, "Unknown magic %x, version %d, request type %d from %s %s",
222 request.magic, request.version, request.type, device_info, device);
227 if(connect(write_fd, &request.sock, sizeof request.sock) < 0) {
228 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind write %s: %s", device_info, strerror(errno));
233 write(request_fd, &data_sun, sizeof data_sun);
236 logger(DEBUG_ALWAYS, LOG_INFO, "Connection with UML established");
243 if((inlen = read(data_fd, packet->data, MTU)) <= 0) {
244 logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
245 device, strerror(errno));
252 device_total_in += packet->len;
254 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
261 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid value for state variable in " __FILE__);
266 static bool write_packet(vpn_packet_t *packet) {
268 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Dropping packet of %d bytes to %s: not connected to UML yet",
269 packet->len, device_info);
273 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s",
274 packet->len, device_info);
276 if(write(write_fd, packet->data, packet->len) < 0) {
277 if(errno != EINTR && errno != EAGAIN) {
278 logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
285 device_total_out += packet->len;
290 static void dump_device_stats(void) {
291 logger(DEBUG_ALWAYS, LOG_DEBUG, "Statistics for %s %s:", device_info, device);
292 logger(DEBUG_ALWAYS, LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
293 logger(DEBUG_ALWAYS, LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
296 const devops_t uml_devops = {
297 .setup = setup_device,
298 .close = close_device,
300 .write = write_packet,
301 .dump_stats = dump_device_stats,