1 /* ttt-server.c - tic-tac-toe game server
3 * Copyright © 2005 Carl Worth
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, or (at your option)
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 Foundation,
17 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 * Author: Carl Worth <cworth@cworth.org>
22 #include "ttt-server.h"
25 #include "ttt-client.h"
26 #include "ttt-error.h"
27 #include "ttt-socket.h"
30 pthread_mutex_t mutex;
37 ttt_client_t **clients;
43 ttt_server_init (ttt_server_t *server, const char *host, const char *port)
45 pthread_mutex_init (&server->mutex, NULL);
50 server->next_client_id = 0;
52 server->clients = NULL;
53 server->clients_size = 0;
54 server->num_clients = 0;
57 /* Exported: See ttt-server.h for documentation. */
59 ttt_server_register_client (ttt_server_t *server, ttt_client_t *client)
62 ttt_error_t error = TTT_ERROR_NONE;
65 pthread_mutex_lock (&server->mutex);
67 name = xstrdup (ttt_client_get_name (client));
70 xasprintf(&name, "user%03d", server->next_client_id++);
71 ttt_client_set_name (client, name);
74 /* XXX: If generated name is not unique, this will return an error,
75 which violates the protocol. */
76 for (i = 0; i < server->num_clients; i++) {
77 if (strcmp (ttt_client_get_name (server->clients[i]), name) == 0) {
78 error = TTT_ERROR_INVALIDNAME;
83 printf ("Client %s has joined.\n", name);
86 server->num_clients++;
88 if (server->num_clients > server->clients_size) {
89 if (server->clients_size == 0)
90 server->clients_size = 1;
92 server->clients_size *= 2;
94 server->clients = xrealloc (server->clients,
95 server->clients_size * sizeof (ttt_client_t *));
98 server->clients [server->num_clients - 1] = client;
101 pthread_mutex_unlock (&server->mutex);
106 /* Exported: See ttt-server.h for documentation. */
108 ttt_server_unregister_client (ttt_server_t *server, ttt_client_t *client)
112 pthread_mutex_lock (&server->mutex);
114 for (i = 0; i < server->num_clients; i++)
115 if (server->clients[i] == client)
118 assert (i < server->num_clients);
120 printf ("Client %s has left.\n", ttt_client_get_name (client));
122 memmove (&server->clients[i], &server->clients[i+1],
123 (server->num_clients - i - 1) * sizeof (ttt_client_t *));
125 server->num_clients--;
127 pthread_mutex_unlock (&server->mutex);
131 ttt_server_broadcast (ttt_server_t *server, const char *message)
135 pthread_mutex_lock (&server->mutex);
137 for (i = 0; i < server->num_clients; i++)
138 ttt_client_send (server->clients[i], message);
140 pthread_mutex_unlock (&server->mutex);
143 /* Exported: See ttt-server.h for documentation. */
145 ttt_server_get_host (ttt_server_t *server)
150 /* Exported: See ttt-server.h for documentation. */
152 ttt_server_get_port (ttt_server_t *server)
157 static const char *WELCOME_MESSAGE =
158 "Welcome to ttt-server. So far, this program is still a demonstration\n"
159 "TCP/IP server, acting something like a rather braindead chat server.\n"
160 "The server is currently listening on:\n"
162 "\nTo test this, simply connect one or more clients to that host and port.\n"
165 "\nOnce you have connected a client, the server will send each line of text\n"
166 "it receives to all connected clients. The server reports client joins and\n"
167 "departures on stdout.\n"
168 "\nNote that to terminate the telnet client you type Control-], then\n"
169 "<Enter>, then \"close\" (and <Enter>) at the \"telnet> \" prompt.\n"
172 "\nPS. At this point we're ready to leave the demonstration phase and to\n"
173 "begin implementing TTTP (tic-tac-toe protocol) as well as fixing the\n"
174 "protocol specifcation. We don't need a custom client to move forward on\n"
175 "the server (that is one of the ideas behind using a telnet-compatible\n"
176 "protocol), but a custom client would still be a fine project for a\n"
177 "motivated beginning programmer.\n\n";
180 _ttt_server_accept (void *closure, int client_socket)
182 ttt_server_t *server = closure;
184 ttt_client_new (server, client_socket);
188 main (int argc, char **argv)
194 ttt_args_parse (&args, argc, argv);
197 xfreopen (args.log_file, "a", stderr);
199 socket = ttt_socket_create_server (args.host, args.port);
201 printf (WELCOME_MESSAGE, args.host, args.port, args.host, args.port);
203 ttt_server_init (&server, args.host, args.port);
206 ttt_socket_accept (socket, _ttt_server_accept, &server);
208 /* We only reach here if something bad happened. */