static int
dlinfoack(int fd, char *bufp, char *ebuf)
{
return (recv_ack(fd, DL_INFO_ACK_SIZE, "info", bufp, ebuf, NULL));
}
static int
dlbindack(int fd, char *bufp, char *ebuf, int *uerror)
{
return (recv_ack(fd, DL_BIND_ACK_SIZE, "bind", bufp, ebuf, uerror));
}
static int
dlokack(int fd, const char *what, char *bufp, char *ebuf)
{
return (recv_ack(fd, DL_OK_ACK_SIZE, what, bufp, ebuf, NULL));
}
/**
* void process_dgram(char *dgram, struct sockaddr_in *addr)
*
* Processes accepted datagram. Checks if sequential ID is correct, if it's lower,
* we resend the ACK packet and dont bother with that datagram anymore, because
* it was already processed before.
*/
void process_dgram(char *dgram, struct sockaddr_in *addr) {
/* Protocol token */
char *token;
/* Token length */
int token_len;
/* Command */
char *type;
/* Generic char buffer */
char *generic_chbuff;
/* Sequential ID of received packet */
int packet_seq_id;
/* Client which we receive from */
client_t *client;
/* Generic unsigned int var */
unsigned int generic_uint;
/* String representation of address */
char addr_str[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &addr->sin_addr, addr_str, INET_ADDRSTRLEN);
/* Log */
sprintf(log_buffer,
"DATA_IN: %s <--- %s:%d",
dgram,
addr_str,
htons(addr->sin_port)
);
log_line(log_buffer, LOG_DEBUG);
token = strtok(dgram, ";");
token_len = strlen(token);
generic_chbuff = strtok(NULL, ";");
packet_seq_id = (int) strtol(generic_chbuff, NULL, 0);
/* Check if datagram belongs to us */
if( (token_len == strlen(STRINGIFY(APP_TOKEN))) &&
strncmp(token, STRINGIFY(APP_TOKEN), strlen(STRINGIFY(APP_TOKEN))) == 0 &&
packet_seq_id > 0) {
type = strtok(NULL, ";");
/* New client connection */
if(strncmp(type, "CONNECT", 7) == 0) {
add_client(addr);
client = get_client_by_addr(addr);
if(client) {
send_ack(client, 1, 0);
send_reconnect_code(client);
/* Release client */
release_client(client);
}
}
/* Reconnect */
else if(strncmp(type, "RECONNECT", 9) == 0) {
client = get_client_by_index(get_client_index_by_rcode(strtok(NULL, ";")));
if(client) {
/* Sends ACK aswell after resetting clients SEQ_ID */
reconnect_client(client, addr);
/* Release client */
release_client(client);
}
}
/* Client should already exist */
else {
client = get_client_by_addr(addr);
if(client != NULL) {
/* Check if expected seq ID matches */
if(packet_seq_id == client->pkt_recv_seq_id) {
/* Get command */
if(strncmp(type, "CREATE_GAME", 11) == 0) {
/* ACK client */
send_ack(client, packet_seq_id, 0);
create_game(client);
}
/* Receive ACK packet */
else if(strncmp(type, "ACK", 3) == 0) {
recv_ack(client,
(int) strtoul(strtok(NULL, ";"), NULL, 10));
update_client_timestamp(client);
}
/* Close client connection */
else if(strncmp(type, "CLOSE", 5) == 0) {
/* ACK client */
send_ack(client, packet_seq_id, 0);
leave_game(client);
remove_client(&client);
}
/* Keepalive loop */
else if(strncmp(type, "KEEPALIVE", 9) == 0) {
/* ACK client */
send_ack(client, packet_seq_id, 0);
}
/* Join existing game */
else if(strncmp(type, "JOIN_GAME", 9) == 0) {
/* ACK client */
send_ack(client, packet_seq_id, 0);
join_game(client, strtok(NULL, ";"));
}
/* Leave existing game */
else if(strncmp(type, "LEAVE_GAME", 10) == 0) {
/* ACK client */
send_ack(client, packet_seq_id, 0);
leave_game(client);
}
/* Start game */
else if(strncmp(type, "START_GAME", 10) == 0) {
/* ACK client */
send_ack(client, packet_seq_id, 0);
start_game(client);
}
/* Rolling die */
else if(strncmp(type, "DIE_ROLL", 8) == 0) {
/* ACK client */
send_ack(client, packet_seq_id, 0);
roll_die(client);
}
/* Moving figure */
else if(strncmp(type, "FIGURE_MOVE", 11) == 0) {
/* ACK client */
send_ack(client, packet_seq_id, 0);
/* Parse figure id */
generic_chbuff = strtok(NULL, ";");
generic_uint = (unsigned int) strtoul(generic_chbuff, NULL, 10);
move_figure(client, generic_uint);
}
else if(strncmp(type, "MESSAGE", 7) == 0) {
/* ACK client */
send_ack(client, packet_seq_id, 0);
broadcast_message(client, strtok(NULL, ";"));
}
}
/* Packet was already processed */
else if(packet_seq_id < client->pkt_recv_seq_id &&
strncmp(type, "ACK", 3) != 0) {
send_ack(client, packet_seq_id, 1);
}
/* If client didnt close conection */
if(client != NULL) {
/* Release client */
release_client(client);
}
}
}
}
}