2 control.c -- Control socket handling.
3 Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include "control_common.h"
31 static int control_socket = -1;
32 static struct event control_event;
33 static splay_tree_t *control_socket_tree;
34 extern char *controlsocketname;
36 static void handle_control_data(struct bufferevent *event, void *data) {
37 tinc_ctl_request_t req;
39 tinc_ctl_request_t res;
40 struct evbuffer *res_data = NULL;
43 if(EVBUFFER_LENGTH(event->input) < sizeof(tinc_ctl_request_t))
46 /* Copy the structure to ensure alignment */
47 memcpy(&req, EVBUFFER_DATA(event->input), sizeof(tinc_ctl_request_t));
49 if(EVBUFFER_LENGTH(event->input) < req.length)
51 req_data = EVBUFFER_DATA(event->input) + sizeof(tinc_ctl_request_t);
53 if(req.length < sizeof(tinc_ctl_request_t))
56 memset(&res, 0, sizeof res);
60 res_data = evbuffer_new();
61 if (res_data == NULL) {
62 res.res_errno = ENOMEM;
66 if(req.type == REQ_STOP) {
67 logger(LOG_NOTICE, _("Got '%s' command"), "stop");
72 if(req.type == REQ_DUMP_NODES) {
73 logger(LOG_NOTICE, _("Got '%s' command"), "dump nodes");
74 res.res_errno = dump_nodes(res_data);
78 if(req.type == REQ_DUMP_EDGES) {
79 logger(LOG_NOTICE, _("Got '%s' command"), "dump edges");
80 res.res_errno = dump_edges(res_data);
84 if(req.type == REQ_DUMP_SUBNETS) {
85 logger(LOG_NOTICE, _("Got '%s' command"), "dump subnets");
86 res.res_errno = dump_subnets(res_data);
90 if(req.type == REQ_DUMP_CONNECTIONS) {
91 logger(LOG_NOTICE, _("Got '%s' command"), "dump connections");
92 res.res_errno = dump_connections(res_data);
96 if(req.type == REQ_DUMP_GRAPH) {
97 logger(LOG_NOTICE, _("Got '%s' command"), "dump graph");
98 res.res_errno = dump_graph(res_data);
102 if(req.type == REQ_PURGE) {
103 logger(LOG_NOTICE, _("Got '%s' command"), "purge");
108 if(req.type == REQ_SET_DEBUG) {
109 debug_t new_debug_level;
111 logger(LOG_NOTICE, _("Got '%s' command"), "debug");
112 if(req.length != sizeof(req) + sizeof debug_level)
113 res.res_errno = EINVAL;
115 memcpy(&new_debug_level, req_data, sizeof(debug_t));
116 logger(LOG_NOTICE, _("Changing debug level from %d to %d"),
117 debug_level, new_debug_level);
118 if(evbuffer_add_printf(res_data,
119 _("Changing debug level from %d to %d\n"),
120 debug_level, new_debug_level) == -1)
121 res.res_errno = errno;
122 debug_level = new_debug_level;
127 if(req.type == REQ_RETRY) {
128 logger(LOG_NOTICE, _("Got '%s' command"), "retry");
133 logger(LOG_DEBUG, _("Malformed control command received"));
134 res.res_errno = EINVAL;
137 res.length = (sizeof res)
138 + ((res_data == NULL) ? 0 : EVBUFFER_LENGTH(res_data));
139 evbuffer_drain(event->input, req.length);
140 if(bufferevent_write(event, &res, sizeof res) == -1)
142 if(res_data != NULL) {
143 if(bufferevent_write_buffer(event, res_data) == -1)
145 evbuffer_free(res_data);
150 logger(LOG_INFO, _("Closing control socket on error"));
151 evbuffer_free(res_data);
152 close(event->ev_read.ev_fd);
153 splay_delete(control_socket_tree, event);
156 static void handle_control_error(struct bufferevent *event, short what, void *data) {
157 if(what & EVBUFFER_EOF)
158 logger(LOG_DEBUG, _("Control socket connection closed by peer"));
160 logger(LOG_DEBUG, _("Error while reading from control socket: %s"), strerror(errno));
162 close(event->ev_read.ev_fd);
163 splay_delete(control_socket_tree, event);
166 static void handle_new_control_socket(int fd, short events, void *data) {
168 struct bufferevent *ev;
169 tinc_ctl_greeting_t greeting;
171 newfd = accept(fd, NULL, NULL);
174 logger(LOG_ERR, _("Accepting a new connection failed: %s"), strerror(errno));
175 event_del(&control_event);
179 ev = bufferevent_new(newfd, handle_control_data, NULL, handle_control_error, NULL);
181 logger(LOG_ERR, _("Could not create bufferevent for new control connection: %s"), strerror(errno));
186 memset(&greeting, 0, sizeof greeting);
187 greeting.version = TINC_CTL_VERSION_CURRENT;
188 if(bufferevent_write(ev, &greeting, sizeof greeting) == -1) {
190 _("Cannot send greeting for new control connection: %s"),
192 bufferevent_free(ev);
197 bufferevent_enable(ev, EV_READ);
198 splay_insert(control_socket_tree, ev);
200 logger(LOG_DEBUG, _("Control socket connection accepted"));
203 static int control_compare(const struct event *a, const struct event *b) {
204 return a < b ? -1 : a > b ? 1 : 0;
207 bool init_control() {
209 struct sockaddr_un addr;
211 if(strlen(controlsocketname) >= sizeof addr.sun_path) {
212 logger(LOG_ERR, _("Control socket filename too long!"));
216 memset(&addr, 0, sizeof addr);
217 addr.sun_family = AF_UNIX;
218 strncpy(addr.sun_path, controlsocketname, sizeof addr.sun_path - 1);
220 control_socket = socket(PF_UNIX, SOCK_STREAM, 0);
222 if(control_socket < 0) {
223 logger(LOG_ERR, _("Creating UNIX socket failed: %s"), strerror(errno));
227 //unlink(controlsocketname);
228 result = bind(control_socket, (struct sockaddr *)&addr, sizeof addr);
230 if(result < 0 && errno == EADDRINUSE) {
231 result = connect(control_socket, (struct sockaddr *)&addr, sizeof addr);
233 logger(LOG_WARNING, _("Removing old control socket."));
234 unlink(controlsocketname);
235 result = bind(control_socket, (struct sockaddr *)&addr, sizeof addr);
237 close(control_socket);
239 logger(LOG_ERR, _("Another tincd is already running for net `%s'."), netname);
241 logger(LOG_ERR, _("Another tincd is already running."));
247 logger(LOG_ERR, _("Can't bind to %s: %s\n"), controlsocketname, strerror(errno));
248 close(control_socket);
252 if(listen(control_socket, 3) < 0) {
253 logger(LOG_ERR, _("Can't listen on %s: %s\n"), controlsocketname, strerror(errno));
254 close(control_socket);
258 control_socket_tree = splay_alloc_tree((splay_compare_t)control_compare, (splay_action_t)bufferevent_free);
260 event_set(&control_event, control_socket, EV_READ | EV_PERSIST, handle_new_control_socket, NULL);
261 event_add(&control_event, NULL);
266 void exit_control() {
267 event_del(&control_event);
268 close(control_socket);
269 unlink(controlsocketname);