/**
* [Server only]
* Handle a new connection from a client. Set up connection details and
* initialize sequence numbers.
*
* pkt: The SYN segment from the client.
* returns: The conn_t associated with the new connection.
*/
conn_t *tcp_new_connection(char *pkt) { ASSERT_SERVER_ONLY;
/* Ignore if too many clients are connected. */
if (num_connected >= MAX_NUM_CLIENTS) {
fprintf(stderr, "[ERROR] Maximum number of clients (%d) reached\n",
MAX_NUM_CLIENTS);
return NULL;
}
num_connected++;
iphdr_t *ip_hdr = (iphdr_t *) pkt;
tcphdr_t *syn = (tcphdr_t *) (pkt + IP_HDR_SIZE);
/* Set up connection details and add to list of connections. */
conn_t *conn = calloc(sizeof(conn_t), 1);
conn_setup(conn, ntohl(ip_hdr->saddr), ntohs(syn->th_sport), unix_socket);
conn->their_init_seqno = ntohl(syn->th_seq);
conn->ackno = conn->their_init_seqno + 1;
conn_add(conn);
/* Send a SYN-ACK to the client. */
send_synack(conn);
/* Get window size of the client. */
ctcp_cfg->send_window = ntohs(syn->window);
ctcp_config_t *config_copy = calloc(sizeof(ctcp_config_t), 1);
memcpy(config_copy, ctcp_cfg, sizeof(ctcp_config_t));
/* Student code. */
ctcp_state_t *state = ctcp_init(conn, config_copy);
conn->state = state;
fprintf(stderr, "[INFO] Client connected\n");
return conn;
}
void irc_core_init(void)
{
CHAT_PROTOCOL_REC *rec;
rec = g_new0(CHAT_PROTOCOL_REC, 1);
rec->name = "IRC";
rec->fullname = "Internet Relay Chat";
rec->chatnet = "ircnet";
rec->case_insensitive = TRUE;
rec->create_chatnet = create_chatnet;
rec->create_server_setup = create_server_setup;
rec->create_channel_setup = create_channel_setup;
rec->create_server_connect = create_server_connect;
rec->destroy_server_connect = destroy_server_connect;
rec->server_init_connect = irc_server_init_connect;
rec->server_connect = irc_server_connect;
rec->channel_create =
(CHANNEL_REC *(*) (SERVER_REC *, const char *,
const char *, int))
irc_channel_create;
rec->query_create =
(QUERY_REC *(*) (const char *, const char *, int))
irc_query_create;
chat_protocol_register(rec);
g_free(rec);
irc_session_init();
irc_chatnets_init();
irc_servers_init();
irc_channels_init();
irc_queries_init();
ctcp_init();
irc_commands_init();
irc_irc_init();
lag_init();
netsplit_init();
irc_expandos_init();
settings_check();
module_register("core", "irc");
}
/**
* Start a client.
*
* server: String containing the server to connect to.
* port: The port the client will run on.
*/
int start_client(char *server, char *port) {
if (do_config_server(server) < 0 || do_config(port) < 0)
return -1;
/* Initialize connection with server. Go to student code. */
conn_t *conn = tcp_handshake();
ctcp_config_t *config_copy = calloc(sizeof(ctcp_config_t), 1);
memcpy(config_copy, ctcp_cfg, sizeof(ctcp_config_t));
ctcp_state_t *state = ctcp_init(conn, config_copy);
if (state == NULL) {
fprintf(stderr, "[ERROR] Could not connect to server!\n");
return -1;
}
fprintf(stderr, "[INFO] Connected to server\n");
config->sconn->state = state;
setup_poll();
do_loop();
return 0;
}
