1 /* ttt-client.c - client handling code for 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-client.h"
24 #include "ttt-error.h"
26 #include "ttt-server.h"
27 #include "ttt-socket.h"
28 #include "ttt-token.h"
31 pthread_mutex_t mutex;
39 ttt_bool_t registered;
41 char **request_strings;
42 int num_request_strings;
45 typedef ttt_error_t (*ttt_command_func_t) (ttt_client_t *client,
50 _ttt_client_execute_helo (ttt_client_t *client,
55 _ttt_client_execute_quit (ttt_client_t *client,
59 typedef struct _ttt_command_description {
62 ttt_command_func_t execute;
63 } ttt_command_description_t;
65 ttt_command_description_t command_descriptions[] = {
66 {"HELO", 1, _ttt_client_execute_helo},
67 {"QUIT", 0, _ttt_client_execute_quit}
69 #define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0]))
72 _ttt_client_execute_helo (ttt_client_t *client,
79 assert (num_args == 1);
81 ttt_client_set_name (client, args[0]);
83 error = ttt_server_register_client (client->server, client);
87 client->registered = TRUE;
89 xasprintf (&response, "HELO %s %s %s\n", client->name,
90 ttt_server_get_host (client->server),
91 ttt_server_get_port (client->server));
93 ttt_client_send (client, response);
97 return TTT_ERROR_NONE;
101 _ttt_client_execute_quit (ttt_client_t *client,
105 assert (num_args == 0);
107 return TTT_ERROR_QUIT_REQUESTED;
111 _free_request (ttt_client_t *client);
114 _ttt_client_init (ttt_client_t *client,
115 ttt_server_t *server,
120 pthread_mutex_init (&client->mutex, NULL);
122 client->server = server;
123 client->socket = socket;
125 file = xfdopen (socket, "r");
126 yylex_init(&client->scanner);
127 yyset_in (file, client->scanner);
129 client->request_strings = NULL;
130 client->num_request_strings = 0;
133 client->registered = FALSE;
137 _ttt_client_fini (ttt_client_t *client)
139 pthread_mutex_lock (&client->mutex);
141 if (client->registered)
142 ttt_server_unregister_client (client->server, client);
147 yylex_destroy (client->scanner);
148 shutdown (client->socket, SHUT_RDWR);
150 _free_request (client);
152 pthread_mutex_unlock (&client->mutex);
154 pthread_mutex_destroy (&client->mutex);
157 /* XXX: The memory management for the request strings is pretty cheesy. */
159 _append_to_request (ttt_client_t *client,
162 client->num_request_strings++;
163 client->request_strings =
164 xrealloc (client->request_strings,
165 client->num_request_strings * sizeof (char *));
167 client->request_strings[client->num_request_strings - 1] = xstrdup (string);
171 _free_request (ttt_client_t *client)
175 for (i = 0; i < client->num_request_strings; i++)
176 free (client->request_strings[i]);
178 free (client->request_strings);
180 client->request_strings = NULL;
181 client->num_request_strings = 0;
185 _read_request (ttt_client_t *client)
189 _free_request (client);
192 token = yylex (client->scanner);
193 /* Yes, EOF in two different enums is pretty ugly. */
194 if (token == TTT_TOKEN_EOF)
195 return TTT_STATUS_EOF;
197 if (token == TTT_TOKEN_NEWLINE) {
198 if (client->num_request_strings)
199 return TTT_STATUS_SUCCESS;
204 assert (token == TTT_TOKEN_STRING);
206 _append_to_request (client, yyget_text (client->scanner));
211 _execute_request (ttt_client_t *client)
215 char *command = client->request_strings[0];
216 int num_args = client->num_request_strings-1;
217 ttt_command_description_t *desc;
219 for (i=0; i < strlen (command); i++)
220 command[i] = toupper (command[i]);
222 for (i=0; i < ARRAY_SIZE(command_descriptions); i++) {
223 desc = &command_descriptions[i];
224 if (strcmp(command, desc->command) == 0) {
225 if (num_args != desc->args_required)
226 return TTT_ERROR_SYNTAX;
227 return (desc->execute) (client, &client->request_strings[1], num_args);
231 return TTT_ERROR_COMMAND;
235 _handle_requests_thread (void *closure)
239 ttt_client_t *client = closure;
243 status = _read_request (client);
244 if (status == TTT_STATUS_EOF)
249 error = _execute_request (client);
250 if (error == TTT_ERROR_QUIT_REQUESTED)
253 ttt_client_send (client, ttt_error_string (error));
256 _ttt_client_fini (client);
262 /* Exported: See ttt-client.h for documentation. */
264 ttt_client_new (void *closure, int client_socket)
266 ttt_server_t *server = closure;
267 ttt_client_t *client;
270 client = xmalloc (sizeof (ttt_client_t));
272 _ttt_client_init (client, server, client_socket);
274 err = pthread_create (&client->thread, NULL,
275 _handle_requests_thread, client);
277 fprintf (stderr, "Error: pthread_create failed: %s. Aborting.\n",
283 /* Exported: See ttt-client.h for documentation. */
285 ttt_client_send (ttt_client_t *client, const char *message)
287 pthread_mutex_lock (&client->mutex);
289 ttt_socket_write (client->socket, message, strlen (message));
291 pthread_mutex_unlock (&client->mutex);
294 /* Exported: See ttt-client.h for documentation. */
296 ttt_client_get_name (ttt_client_t *client)
301 /* Exported: See ttt-client.h for documentation. */
303 ttt_client_set_name (ttt_client_t *client, const char *name)
306 client->name = xstrdup (name);