2 /* ***** BEGIN LICENSE BLOCK *****
3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 * The contents of this file are subject to the Mozilla Public License Version
6 * 1.1 (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 * http://www.mozilla.org/MPL/
10 * Software distributed under the License is distributed on an "AS IS" basis,
11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 * for the specific language governing rights and limitations under the
15 * The Original Code is guacd.
17 * The Initial Developer of the Original Code is
19 * Portions created by the Initial Developer are Copyright (C) 2010
20 * the Initial Developer. All Rights Reserved.
24 * Alternatively, the contents of this file may be used under the terms of
25 * either the GNU General Public License Version 2 or later (the "GPL"), or
26 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 * in which case the provisions of the GPL or the LGPL are applicable instead
28 * of those above. If you wish to allow use of your version of this file only
29 * under the terms of either the GPL or the LGPL, and not to allow others to
30 * use your version of this file under the terms of the MPL, indicate your
31 * decision by deleting the provisions above and replace them with the notice
32 * and other provisions required by the GPL or the LGPL. If you do not delete
33 * the provisions above, a recipient may use your version of this file under
34 * the terms of any one of the MPL, the GPL or the LGPL.
36 * ***** END LICENSE BLOCK ***** */
43 #include <sys/types.h>
45 #include <sys/socket.h>
47 #include <netinet/in.h>
52 #include <guacamole/client.h>
53 #include <guacamole/error.h>
58 void guacd_handle_connection(int fd) {
61 guac_client_plugin* plugin;
62 guac_instruction* select;
63 guac_instruction* connect;
65 /* Open guac_socket */
66 guac_socket* socket = guac_socket_open(fd);
68 /* Get protocol from select instruction */
69 select = guac_protocol_expect_instruction(
70 socket, GUACD_USEC_TIMEOUT, "select");
74 guacd_log_guac_error("Error reading \"select\"");
77 guac_socket_close(socket);
81 /* Validate args to select */
82 if (select->argc != 1) {
85 syslog(LOG_ERR, "Bad number of arguments to \"select\" (%i)",
89 guac_socket_close(socket);
93 syslog(LOG_INFO, "Protocol \"%s\" selected", select->argv[0]);
95 /* Get plugin from protocol in select */
96 plugin = guac_client_plugin_open(select->argv[0]);
97 guac_instruction_free(select);
102 guacd_log_guac_error("Error loading client plugin");
105 guac_socket_close(socket);
109 /* Send args response */
110 if (guac_protocol_send_args(socket, plugin->args)
111 || guac_socket_flush(socket)) {
114 guacd_log_guac_error("Error sending \"args\"");
116 if (guac_client_plugin_close(plugin))
117 guacd_log_guac_error("Error closing client plugin");
119 guac_socket_close(socket);
123 /* Get args from connect instruction */
124 connect = guac_protocol_expect_instruction(
125 socket, GUACD_USEC_TIMEOUT, "connect");
126 if (connect == NULL) {
129 guacd_log_guac_error("Error reading \"connect\"");
131 if (guac_client_plugin_close(plugin))
132 guacd_log_guac_error("Error closing client plugin");
134 guac_socket_close(socket);
138 /* Load and init client */
139 client = guac_client_plugin_get_client(plugin, socket,
140 connect->argc, connect->argv);
141 guac_instruction_free(connect);
143 if (client == NULL) {
145 guacd_log_guac_error("Error instantiating client");
147 if (guac_client_plugin_close(plugin))
148 guacd_log_guac_error("Error closing client plugin");
150 guac_socket_close(socket);
154 /* Set up logging in client */
155 client->log_info_handler = guacd_log_info;
156 client->log_error_handler = guacd_log_error;
158 /* Start client threads */
159 syslog(LOG_INFO, "Starting client");
160 if (guacd_client_start(client))
161 syslog(LOG_ERR, "Client finished abnormally");
163 syslog(LOG_INFO, "Client finished normally");
166 guac_client_free(client);
167 if (guac_client_plugin_close(plugin))
168 syslog(LOG_ERR, "Error closing client plugin");
171 guac_socket_close(socket);
177 int main(int argc, char* argv[]) {
181 struct addrinfo* addresses;
182 struct addrinfo* current_address;
183 char bound_address[1024];
187 struct addrinfo hints = {
188 .ai_family = AF_UNSPEC,
189 .ai_socktype = SOCK_STREAM,
190 .ai_protocol = IPPROTO_TCP
194 struct sockaddr_in client_addr;
195 socklen_t client_addr_len;
196 int connected_socket_fd;
199 char* listen_address = NULL; /* Default address of INADDR_ANY */
200 char* listen_port = "4822"; /* Default port */
201 char* pidfile = NULL;
210 /* Parse arguments */
211 while ((opt = getopt(argc, argv, "l:b:p:")) != -1) {
213 listen_port = strdup(optarg);
215 else if (opt == 'b') {
216 listen_address = strdup(optarg);
218 else if (opt == 'p') {
219 pidfile = strdup(optarg);
223 fprintf(stderr, "USAGE: %s"
225 " [-b LISTENADDRESS]"
226 " [-p PIDFILE]\n", argv[0]);
232 /* Get addresses for binding */
233 if ((retval = getaddrinfo(listen_address, listen_port, &hints, &addresses))) {
234 fprintf(stderr, "Error parsing given address or port: %s\n",
235 gai_strerror(retval));
240 socket_fd = socket(AF_INET, SOCK_STREAM, 0);
242 fprintf(stderr, "Error opening socket: %s\n", strerror(errno));
246 /* Allow socket reuse */
247 if (setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, (void*) &opt_on, sizeof(opt_on))) {
248 fprintf(stderr, "Warning: Unable to set socket options for reuse: %s\n", strerror(errno));
251 /* Attempt binding of each address until success */
252 current_address = addresses;
253 while (current_address != NULL) {
257 /* Resolve hostname */
258 if ((retval = getnameinfo(current_address->ai_addr,
259 current_address->ai_addrlen,
260 bound_address, sizeof(bound_address),
261 bound_port, sizeof(bound_port),
262 NI_NUMERICHOST | NI_NUMERICSERV)))
263 fprintf(stderr, "Unable to resolve host: %s\n",
264 gai_strerror(retval));
266 /* Attempt to bind socket to address */
268 current_address->ai_addr,
269 current_address->ai_addrlen) == 0) {
271 fprintf(stderr, "Successfully bound socket to "
272 "host %s, port %s\n", bound_address, bound_port);
274 /* Done if successful bind */
279 /* Otherwise log error */
281 fprintf(stderr, "Error binding socket to "
282 "host %s, port %s: %s\n",
283 bound_address, bound_port, strerror(errno));
285 current_address = current_address->ai_next;
289 /* If unable to bind to anything, fail */
290 if (current_address == NULL) {
291 fprintf(stderr, "Unable to bind socket to any addresses.\n");
295 /* Fork into background */
299 if (daemon_pid == -1) {
300 fprintf(stderr, "Error forking daemon process: %s\n", strerror(errno));
304 /* If parent, write PID file and exit */
305 else if (daemon_pid != 0) {
307 if (pidfile != NULL) {
309 /* Attempt to open pidfile and write PID */
310 FILE* pidf = fopen(pidfile, "w");
312 fprintf(pidf, "%d\n", daemon_pid);
316 /* Warn on failure */
318 fprintf(stderr, "WARNING: Could not write PID file: %s\n", strerror(errno));
328 openlog(NULL, LOG_PID, LOG_DAEMON);
331 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
332 syslog(LOG_ERR, "Could not set handler for SIGPIPE to ignore. SIGPIPE may cause termination of the daemon.");
335 /* Ignore SIGCHLD (force automatic removal of children) */
336 if (signal(SIGCHLD, SIG_IGN) == SIG_ERR) {
337 syslog(LOG_ERR, "Could not set handler for SIGCHLD to ignore. Child processes may pile up in the process table.");
340 /* Log listening status */
342 "Listening on host %s, port %s", bound_address, bound_port);
345 freeaddrinfo(addresses);
352 /* Listen for connections */
353 if (listen(socket_fd, 5) < 0) {
354 syslog(LOG_ERR, "Could not listen on socket: %s", strerror(errno));
358 /* Accept connection */
359 client_addr_len = sizeof(client_addr);
360 connected_socket_fd = accept(socket_fd, (struct sockaddr*) &client_addr, &client_addr_len);
361 if (connected_socket_fd < 0) {
362 syslog(LOG_ERR, "Could not accept client connection: %s", strerror(errno));
367 * Once connection is accepted, send child into background.
369 * Note that we prefer fork() over threads for connection-handling
370 * processes as they give each connection its own memory area, and
371 * isolate the main daemon and other connections from errors in any
372 * particular client plugin.
379 syslog(LOG_ERR, "Error forking child process: %s\n", strerror(errno));
381 /* If child, start client, and exit when finished */
382 else if (child_pid == 0) {
383 guacd_handle_connection(connected_socket_fd);
384 close(connected_socket_fd);
388 /* If parent, close reference to child's descriptor */
389 else if (close(connected_socket_fd) < 0) {
390 syslog(LOG_ERR, "Error closing daemon reference to child descriptor: %s", strerror(errno));
396 if (close(socket_fd) < 0) {
397 syslog(LOG_ERR, "Could not close socket: %s", strerror(errno));