2 device.c -- UML network socket
3 Copyright (C) 2002-2005 Ivo Timmermans,
4 2002-2017 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, RUNSTATEDIR "/%s.umlsocket", identname);
66 get_config_string(lookup_config(config_tree, "Interface"), &iface);
68 device_info = "UML network socket";
70 if((write_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
71 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open write %s: %s", device_info, strerror(errno));
77 fcntl(write_fd, F_SETFD, FD_CLOEXEC);
80 setsockopt(write_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
82 if(fcntl(write_fd, F_SETFL, O_NONBLOCK) < 0) {
83 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
88 if((data_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
89 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open data %s: %s", device_info, strerror(errno));
95 fcntl(data_fd, F_SETFD, FD_CLOEXEC);
98 setsockopt(data_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
100 if(fcntl(data_fd, F_SETFL, O_NONBLOCK) < 0) {
101 logger(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", device_info,
126 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
129 setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
131 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
132 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
136 listen_sun.sun_family = AF_UNIX;
137 strncpy(listen_sun.sun_path, device, sizeof(listen_sun.sun_path));
139 if(bind(listen_fd, (struct sockaddr *)&listen_sun, sizeof(listen_sun)) < 0) {
140 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind %s to %s: %s", device_info, device, strerror(errno));
144 if(listen(listen_fd, 1) < 0) {
145 logger(DEBUG_ALWAYS, LOG_ERR, "Could not listen on %s %s: %s", device_info, device, strerror(errno));
149 device_fd = listen_fd;
152 logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
154 if(routing_mode == RMODE_ROUTER) {
155 overwrite_mac = true;
161 void close_device(void) {
167 if(request_fd >= 0) {
195 static bool read_packet(vpn_packet_t *packet) {
201 socklen_t salen = sizeof(sa);
203 request_fd = accept(listen_fd, &sa, &salen);
206 logger(DEBUG_ALWAYS, LOG_ERR, "Could not accept connection to %s %s: %s", device_info, device, strerror(errno));
211 fcntl(request_fd, F_SETFD, FD_CLOEXEC);
214 if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
215 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
222 device_fd = request_fd;
229 if((inlen = read(request_fd, &request, sizeof(request))) != sizeof(request)) {
230 logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading request from %s %s: %s", device_info,
231 device, strerror(errno));
236 if(request.magic != 0xfeedface || request.version != 3 || request.type != REQ_NEW_CONTROL) {
237 logger(DEBUG_ALWAYS, LOG_ERR, "Unknown magic %x, version %d, request type %d from %s %s",
238 request.magic, request.version, request.type, device_info, device);
243 if(connect(write_fd, (struct sockkadr *)&request.sock, sizeof(request.sock)) < 0) {
244 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind write %s: %s", device_info, strerror(errno));
249 write(request_fd, &data_sun, sizeof(data_sun));
252 logger(DEBUG_ALWAYS, LOG_INFO, "Connection with UML established");
259 if((inlen = read(data_fd, DATA(packet), MTU)) <= 0) {
260 logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
261 device, strerror(errno));
268 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
275 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid value for state variable in " __FILE__);
280 static bool write_packet(vpn_packet_t *packet) {
282 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Dropping packet of %d bytes to %s: not connected to UML yet",
283 packet->len, device_info);
287 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s",
288 packet->len, device_info);
290 if(write(write_fd, DATA(packet), packet->len) < 0) {
291 if(errno != EINTR && errno != EAGAIN) {
292 logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
302 const devops_t uml_devops = {
303 .setup = setup_device,
304 .close = close_device,
306 .write = write_packet,