-/* ttt.c - client-server tic-tac-toe game
+/* ttt-client.c - client handling code for tic-tac-toe game server
*
* Copyright © 2005 Carl Worth
*
* Author: Carl Worth <cworth@cworth.org>
*/
-#include "ttt.h"
+#include "ttt-client.h"
+#include "ttt-error.h"
+#include "ttt-server.h"
+#include "ttt-socket.h"
+#include "ttt-token.h"
-int
-main (int argc, char **argv)
+#define YY_DECL int yylex (yyscan_t yyscanner, ttt_token_t *token)
+#include "ttt-lex.h"
+YY_DECL;
+
+struct _ttt_client {
+ pthread_mutex_t mutex;
+ pthread_t thread;
+
+ ttt_server_t *server;
+ int socket;
+ yyscan_t scanner;
+
+ char **request_strings;
+ int num_request_strings;
+
+ char *username;
+ ttt_bool_t registered;
+ int num_wins;
+};
+
+typedef ttt_error_t (*ttt_command_func_t) (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_helo (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_who (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_statistics (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_message (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_help (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_version (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_quit (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_invite (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_accept (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_retract (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+static ttt_error_t
+_ttt_client_execute_decline (ttt_client_t *client,
+ char **args,
+ int num_args);
+
+typedef struct _ttt_command_description {
+ const char *command;
+ int args_min;
+ int args_max;
+ ttt_command_func_t execute;
+ const char *usage;
+ const char *description;
+} ttt_command_description_t;
+
+ttt_command_description_t command_descriptions[] = {
+ {"HELO", 1, 1, _ttt_client_execute_helo,
+ "HELO <username> ", "Register."},
+
+ {"HELP", 0, 1, _ttt_client_execute_help,
+ "HELP <command> ", "Display help for a command."},
+
+ {"INVITE", 1, 1, _ttt_client_execute_invite,
+ "INVITE <username> ", "Invite a player to play a game."},
+
+ {"ACCEPT", 1, 1, _ttt_client_execute_accept,
+ "ACCEPT <username> ", "Accept a game invitation."},
+
+ {"RETRACT", 1, 1, _ttt_client_execute_retract,
+ "RETRACT <username> ", "Retract a game invitation."},
+
+ {"DECLINE", 1, 1, _ttt_client_execute_decline,
+ "DECLINE <username> ", "Decline a game invitation."},
+
+ {"MESSAGE", 1, 1, _ttt_client_execute_message,
+ "MESSAGE <message> ", "Send a message to everyone."},
+
+ {"STATISTICS", 1, 1, _ttt_client_execute_statistics,
+ "STATISTICS <username> ", "Lists the statistics for the specified user."},
+
+ {"QUIT", 0, 0, _ttt_client_execute_quit,
+ "QUIT ", "Quit session."},
+
+ {"VERSION", 1, 1, _ttt_client_execute_version,
+ "VERSION <client-version>", "Negotiate protocol version."},
+
+ {"WHO", 0, 0, _ttt_client_execute_who,
+ "WHO ", "List registered users."}
+};
+
+#define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0]))
+
+static ttt_error_t
+_ttt_client_execute_helo (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ char *response;
+ char *notice;
+ ttt_error_t error;
+
+ assert (num_args == 1);
+
+ if (!(client->registered))
+ {
+ ttt_client_set_username (client, args[0]);
+
+ error = ttt_server_register_client (client->server, client);
+ if (error)
+ return error;
+ client->registered = TRUE;
+
+ xasprintf (¬ice, "NOTICE USER %s\r\n",
+ ttt_client_get_username (client));
+ ttt_server_broadcast (client->server, notice);
+
+ free (notice);
+ }
+
+ xasprintf (&response, "HELO %s %s %s\r\n",
+ ttt_client_get_username (client),
+ ttt_server_get_host (client->server),
+ ttt_server_get_port (client->server));
+ ttt_client_send (client, response);
+
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_who (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ char *response;
+
+ assert (num_args == 0);
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ response = xstrdup (ttt_server_who (client->server));
+ ttt_client_send (client, response);
+
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_statistics (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ const char *argusername;
+ ttt_client_t *argclient;
+ char *response;
+ ttt_error_t error;
+
+ assert (num_args == 1);
+
+ argusername = args[0];
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ error = ttt_server_get_client_from_username (client->server,
+ argusername,
+ &argclient);
+ if (error)
+ return error;
+
+ xasprintf (&response, "STATISTICS %s \"\r\n"
+ "TICTACTOE WINS %d\r\n"
+ "\"\r\n",
+ ttt_client_get_username(argclient),
+ ttt_client_get_num_wins(argclient));
+
+ ttt_client_send (client, response);
+
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_message (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ const char *argmessage;
+ char *response;
+ char *notice;
+
+ assert (num_args == 1);
+
+ argmessage = args[0];
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ xasprintf (&response, "MESSAGE\r\n");
+ ttt_client_send (client, response);
+
+ xasprintf (¬ice, "NOTICE MESSAGE %s \"%s\"\r\n",
+ ttt_client_get_username(client),
+ argmessage);
+ ttt_server_broadcast (client->server, notice);
+
+ free (notice);
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_help (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ char *response;
+ char *argcommand;
+ ttt_command_description_t *desc;
+ ttt_bool_t is_command = FALSE;
+ int i;
+
+ if (num_args == 0) {
+ xasprintf (&response, "HELP \"\r\n"
+ "Available Commands:\r\n");
+ for (i = 0; i < ARRAY_SIZE(command_descriptions); i++) {
+ desc = &command_descriptions[i];
+ xasprintf (&response, "%s\r\n %s - %s\r\n",
+ response,
+ desc->usage,
+ desc->description);
+ }
+ xasprintf (&response, "%s\"\r\n", response);
+ } else {
+ argcommand = args[0];
+ for (i = 0; i < ARRAY_SIZE(command_descriptions); i++) {
+ desc = &command_descriptions[i];
+ if (strcasecmp (desc->command, argcommand) == 0) {
+ is_command = TRUE;
+ xasprintf (&response, "HELP %s \"\r\n"
+ "%s\r\n"
+ "\r\n"
+ "Usage:\r\n"
+ " %s\r\n"
+ "\"\r\n",
+ desc->command,
+ desc->description,
+ desc->usage);
+ /* XXX: Add detailed help. */
+ }
+ }
+ }
+
+ if ((num_args == 1) && (!is_command))
+ return TTT_ERROR_SYNTAX;
+
+ ttt_client_send (client, response);
+
+ free (response);
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_version (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ char *response;
+ char *argversion;
+ int version;
+ int i;
+
+ assert (num_args == 1);
+
+ argversion = args[0];
+
+ /* Verify that provided version arg is a positive integer */
+ for (i = 0; i < strlen(argversion); i++)
+ if (!isdigit (argversion[i]))
+ return TTT_ERROR_SYNTAX;
+
+ version = atoi (argversion);
+
+ if (version < 1)
+ return TTT_ERROR_SYNTAX;
+
+ if (version > TTT_SERVER_PROTOCOL_VERSION)
+ version = TTT_SERVER_PROTOCOL_VERSION;
+
+ xasprintf (&response, "VERSION %d\r\n",
+ version);
+ ttt_client_send (client, response);
+
+ free (response);
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_quit (ttt_client_t *client,
+ char **args,
+ int num_args)
{
- ttt_args_t args;
- int args_first;
+ char *notice;
- ttt_args_parse (&args, argc, argv, &args_first);
+ assert (num_args == 0);
- /* XXX: insert code here */
+ if (!client->registered)
+ return TTT_ERROR_QUIT_REQUESTED;
+
+ xasprintf (¬ice, "NOTICE QUIT %s\r\n",
+ ttt_client_get_username(client));
+ ttt_server_broadcast (client->server, notice);
+
+ free (notice);
- return 0;
+ return TTT_ERROR_QUIT_REQUESTED;
}
+
+static ttt_error_t
+_ttt_client_execute_invite (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ const char *invitee_username;
+ ttt_client_t *invitee;
+ char *response;
+ char *notice;
+ ttt_error_t error;
+
+ assert (num_args == 1);
+
+ invitee_username = args[0];
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ error = ttt_server_get_client_from_username (client->server,
+ invitee_username,
+ &invitee);
+ if (error)
+ return error;
+
+ ttt_server_add_invite (client->server,
+ client,
+ invitee);
+
+ xasprintf (&response, "INVITE\r\n");
+ ttt_client_send (client, response);
+
+ xasprintf (¬ice, "NOTICE INVITE %s %s\r\n",
+ ttt_client_get_username(client),
+ ttt_client_get_username(invitee));
+ ttt_server_broadcast (client->server, notice);
+
+ free (notice);
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_accept (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ const char *actor_username;
+ ttt_client_t *actor;
+ char *response;
+ char *notice;
+ ttt_error_t error;
+
+ assert (num_args == 1);
+
+ actor_username = args[0];
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ error = ttt_server_get_client_from_username (client->server,
+ actor_username,
+ &actor);
+ if (error)
+ return error;
+
+ error = ttt_server_remove_invite (client->server,
+ actor,
+ client);
+ if (error)
+ return error;
+
+ xasprintf (&response, "ACCEPT\r\n");
+ ttt_client_send (client, response);
+
+ xasprintf (¬ice, "NOTICE ACCEPT %s %s\r\n",
+ ttt_client_get_username(client),
+ ttt_client_get_username(actor));
+ ttt_server_broadcast (client->server, notice);
+
+ /* XXX: Start a new game */
+
+ free (notice);
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_retract (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ const char *invitee_username;
+ ttt_client_t *invitee;
+ char *response;
+ char *notice;
+ ttt_error_t error;
+
+ assert (num_args == 1);
+
+ invitee_username = args[0];
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ error = ttt_server_get_client_from_username (client->server,
+ invitee_username,
+ &invitee);
+ if (error)
+ return error;
+
+ error = ttt_server_remove_invite (client->server,
+ client,
+ invitee);
+ if (error)
+ return error;
+
+ xasprintf (&response, "RETRACT\r\n");
+ ttt_client_send (client, response);
+
+ xasprintf (¬ice, "NOTICE RETRACT %s %s\r\n",
+ ttt_client_get_username(client),
+ ttt_client_get_username(invitee));
+ ttt_server_broadcast (client->server, notice);
+
+ free (notice);
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_decline (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ const char *actor_username;
+ ttt_client_t *actor;
+ char *response;
+ char *notice;
+ ttt_error_t error;
+
+ assert (num_args == 1);
+
+ actor_username = args[0];
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ error = ttt_server_get_client_from_username (client->server,
+ actor_username,
+ &actor);
+ if (error)
+ return error;
+
+ error = ttt_server_remove_invite (client->server,
+ actor,
+ client);
+ if (error)
+ return error;
+
+ xasprintf (&response, "DECLINE\r\n");
+ ttt_client_send (client, response);
+
+ xasprintf (¬ice, "NOTICE DECLINE %s %s\r\n",
+ ttt_client_get_username(client),
+ ttt_client_get_username(actor));
+ ttt_server_broadcast (client->server, notice);
+
+ free (notice);
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static void
+_free_request (ttt_client_t *client);
+
+static void
+_ttt_client_init (ttt_client_t *client,
+ ttt_server_t *server,
+ int socket)
+{
+ FILE *file;
+
+ pthread_mutex_init (&client->mutex, NULL);
+
+ client->server = server;
+ client->socket = socket;
+
+ file = xfdopen (socket, "r");
+ yylex_init (&client->scanner);
+ yyset_in (file, client->scanner);
+
+ client->request_strings = NULL;
+ client->num_request_strings = 0;
+
+ client->username = NULL;
+ client->registered = FALSE;
+ client->num_wins = 0;
+}
+
+static void
+_ttt_client_fini (ttt_client_t *client)
+{
+ pthread_mutex_lock (&client->mutex);
+
+ if (client->registered)
+ ttt_server_unregister_client (client->server, client);
+
+ free (client->username);
+ client->username = NULL;
+
+ yylex_destroy (client->scanner);
+ shutdown (client->socket, SHUT_RDWR);
+
+ _free_request (client);
+
+ pthread_mutex_unlock (&client->mutex);
+
+ pthread_mutex_destroy (&client->mutex);
+}
+
+/* XXX: The memory management for the request strings is pretty cheesy. */
+static void
+_append_to_request (ttt_client_t *client,
+ const char *string)
+{
+ client->num_request_strings++;
+ client->request_strings =
+ xrealloc (client->request_strings,
+ client->num_request_strings * sizeof (char *));
+
+ client->request_strings[client->num_request_strings - 1] = xstrdup (string);
+}
+
+static void
+_free_request (ttt_client_t *client)
+{
+ int i;
+
+ for (i = 0; i < client->num_request_strings; i++)
+ free (client->request_strings[i]);
+
+ free (client->request_strings);
+
+ client->request_strings = NULL;
+ client->num_request_strings = 0;
+}
+
+static ttt_status_t
+_read_request (ttt_client_t *client)
+{
+ ttt_token_t token;
+ ttt_token_type_t token_type;
+
+ _free_request (client);
+
+ while (1) {
+ token_type = yylex (client->scanner, &token);
+ /* Yes, EOF in two different enums is pretty ugly. */
+ if (token_type == TTT_TOKEN_TYPE_EOF)
+ return TTT_STATUS_EOF;
+
+ if (token_type == TTT_TOKEN_TYPE_NEWLINE) {
+ if (client->num_request_strings)
+ return TTT_STATUS_SUCCESS;
+ else
+ continue;
+ }
+
+ assert (token_type == TTT_TOKEN_TYPE_STRING);
+
+ _append_to_request (client, token.u.string);
+
+ free (token.u.string);
+ }
+}
+
+static ttt_error_t
+_execute_request (ttt_client_t *client)
+{
+ char *command = client->request_strings[0];
+ int num_args = client->num_request_strings - 1;
+ ttt_command_description_t *desc;
+ int i;
+
+ for (i = 0; i < strlen (command); i++)
+ command[i] = toupper (command[i]);
+
+ for (i = 0; i < ARRAY_SIZE(command_descriptions); i++) {
+ desc = &command_descriptions[i];
+ if (strcmp (command, desc->command) == 0) {
+ if ((num_args < desc->args_min) || (num_args > desc->args_max))
+ return TTT_ERROR_SYNTAX;
+ return (desc->execute) (client,
+ &client->request_strings[1],
+ num_args);
+ }
+ }
+
+ return TTT_ERROR_COMMAND;
+}
+
+static void *
+_handle_requests_thread (void *closure)
+{
+ ttt_status_t status;
+ ttt_client_t *client = closure;
+ ttt_error_t error;
+
+ while (1) {
+ status = _read_request (client);
+ if (status == TTT_STATUS_EOF)
+ break;
+ if (status)
+ ASSERT_NOT_REACHED;
+
+ error = _execute_request (client);
+ if (error == TTT_ERROR_QUIT_REQUESTED)
+ break;
+ if (error)
+ ttt_client_send (client, ttt_error_string (error));
+ }
+
+ _ttt_client_fini (client);
+ free (client);
+
+ return (void *) 0;
+}
+
+/* Exported: See ttt-client.h for documentation. */
+void
+ttt_client_new (void *closure, int client_socket)
+{
+ ttt_server_t *server = closure;
+ ttt_client_t *client;
+ int err;
+
+ client = xmalloc (sizeof (ttt_client_t));
+
+ _ttt_client_init (client, server, client_socket);
+
+ err = pthread_create (&client->thread, NULL,
+ _handle_requests_thread, client);
+ if (err != 0) {
+ fprintf (stderr, "Error: pthread_create failed: %s. Aborting.\r\n",
+ strerror (err));
+ exit (1);
+ }
+}
+
+/* Exported: See ttt-client.h for documentation. */
+void
+ttt_client_send (ttt_client_t *client, const char *message)
+{
+ pthread_mutex_lock (&client->mutex);
+
+ ttt_socket_write (client->socket, message, strlen (message));
+
+ pthread_mutex_unlock (&client->mutex);
+}
+
+/* Exported: See ttt-client.h for documentation. */
+const char*
+ttt_client_get_username (ttt_client_t *client)
+{
+ return client->username;
+}
+
+/* Exported: See ttt-client.h for documentation. */
+void
+ttt_client_set_username (ttt_client_t *client, const char *username)
+{
+ free (client->username);
+ client->username = xstrdup (username);
+}
+
+/* Exported: See ttt-client.h for documentation. */
+int
+ttt_client_get_num_wins (ttt_client_t *client)
+{
+ return client->num_wins;
+}
+
+/* This is just to keep the compiler quiet about a function declared
+ * static but never defined. Just an annoying bug in flex's output. */
+static int yy_init_globals (yyscan_t yyscanner) {return 0;}
+void use_yy_init_globals (void);
+void use_yy_init_globals (void) {yyscan_t scan; yy_init_globals(scan);}
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