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;
42 if(EVBUFFER_LENGTH(event->input) < sizeof(tinc_ctl_request_t))
45 /* Copy the structure to ensure alignment */
46 memcpy(&req, EVBUFFER_DATA(event->input), sizeof(tinc_ctl_request_t));
48 if(EVBUFFER_LENGTH(event->input) < req.length)
51 if(req.length < sizeof(tinc_ctl_request_t))
54 memset(&res, 0, sizeof res);
58 res_data = evbuffer_new();
59 if (res_data == NULL) {
60 res.res_errno = ENOMEM;
64 if(req.type == REQ_STOP) {
65 logger(LOG_NOTICE, _("Got '%s' command"), "stop");
70 if(req.type == REQ_DUMP_NODES) {
71 logger(LOG_NOTICE, _("Got '%s' command"), "dump nodes");
72 res.res_errno = dump_nodes(res_data);
76 if(req.type == REQ_DUMP_EDGES) {
77 logger(LOG_NOTICE, _("Got '%s' command"), "dump edges");
78 res.res_errno = dump_edges(res_data);
82 if(req.type == REQ_DUMP_SUBNETS) {
83 logger(LOG_NOTICE, _("Got '%s' command"), "dump subnets");
84 res.res_errno = dump_subnets(res_data);
88 if(req.type == REQ_DUMP_CONNECTIONS) {
89 logger(LOG_NOTICE, _("Got '%s' command"), "dump connections");
90 res.res_errno = dump_connections(res_data);
94 if(req.type == REQ_DUMP_GRAPH) {
95 logger(LOG_NOTICE, _("Got '%s' command"), "dump graph");
96 res.res_errno = dump_graph(res_data);
100 logger(LOG_DEBUG, _("Malformed control command received"));
101 res.res_errno = EINVAL;
104 res.length = (sizeof res)
105 + ((res_data == NULL) ? 0 : EVBUFFER_LENGTH(res_data));
106 evbuffer_drain(event->input, req.length);
107 if(bufferevent_write(event, &res, sizeof res) == -1)
109 if(res_data != NULL) {
110 if(bufferevent_write_buffer(event, res_data) == -1)
112 evbuffer_free(res_data);
117 logger(LOG_INFO, _("Closing control socket on error"));
118 evbuffer_free(res_data);
119 close(event->ev_read.ev_fd);
120 splay_delete(control_socket_tree, event);
123 static void handle_control_error(struct bufferevent *event, short what, void *data) {
124 if(what & EVBUFFER_EOF)
125 logger(LOG_DEBUG, _("Control socket connection closed by peer"));
127 logger(LOG_DEBUG, _("Error while reading from control socket: %s"), strerror(errno));
129 close(event->ev_read.ev_fd);
130 splay_delete(control_socket_tree, event);
133 static void handle_new_control_socket(int fd, short events, void *data) {
135 struct bufferevent *ev;
136 tinc_ctl_greeting_t greeting;
138 newfd = accept(fd, NULL, NULL);
141 logger(LOG_ERR, _("Accepting a new connection failed: %s"), strerror(errno));
142 event_del(&control_event);
146 ev = bufferevent_new(newfd, handle_control_data, NULL, handle_control_error, NULL);
148 logger(LOG_ERR, _("Could not create bufferevent for new control connection: %s"), strerror(errno));
153 memset(&greeting, 0, sizeof greeting);
154 greeting.version = TINC_CTL_VERSION_CURRENT;
155 if(bufferevent_write(ev, &greeting, sizeof greeting) == -1) {
157 _("Cannot send greeting for new control connection: %s"),
159 bufferevent_free(ev);
164 bufferevent_enable(ev, EV_READ);
165 splay_insert(control_socket_tree, ev);
167 logger(LOG_DEBUG, _("Control socket connection accepted"));
170 static int control_compare(const struct event *a, const struct event *b) {
171 return a < b ? -1 : a > b ? 1 : 0;
174 bool init_control() {
176 struct sockaddr_un addr;
178 if(strlen(controlsocketname) >= sizeof addr.sun_path) {
179 logger(LOG_ERR, _("Control socket filename too long!"));
183 memset(&addr, 0, sizeof addr);
184 addr.sun_family = AF_UNIX;
185 strncpy(addr.sun_path, controlsocketname, sizeof addr.sun_path - 1);
187 control_socket = socket(PF_UNIX, SOCK_STREAM, 0);
189 if(control_socket < 0) {
190 logger(LOG_ERR, _("Creating UNIX socket failed: %s"), strerror(errno));
194 //unlink(controlsocketname);
195 result = bind(control_socket, (struct sockaddr *)&addr, sizeof addr);
197 if(result < 0 && errno == EADDRINUSE) {
198 result = connect(control_socket, (struct sockaddr *)&addr, sizeof addr);
200 logger(LOG_WARNING, _("Removing old control socket."));
201 unlink(controlsocketname);
202 result = bind(control_socket, (struct sockaddr *)&addr, sizeof addr);
204 close(control_socket);
206 logger(LOG_ERR, _("Another tincd is already running for net `%s'."), netname);
208 logger(LOG_ERR, _("Another tincd is already running."));
214 logger(LOG_ERR, _("Can't bind to %s: %s\n"), controlsocketname, strerror(errno));
215 close(control_socket);
219 if(listen(control_socket, 3) < 0) {
220 logger(LOG_ERR, _("Can't listen on %s: %s\n"), controlsocketname, strerror(errno));
221 close(control_socket);
225 control_socket_tree = splay_alloc_tree((splay_compare_t)control_compare, (splay_action_t)bufferevent_free);
227 event_set(&control_event, control_socket, EV_READ | EV_PERSIST, handle_new_control_socket, NULL);
228 event_add(&control_event, NULL);
233 void exit_control() {
234 event_del(&control_event);
235 close(control_socket);
236 unlink(controlsocketname);