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===== Query un serveur mumble en C =====
==== Doc ====
mirroir de http://mumble.sourceforge.net/Protocol :

The Mumble Protocol is Open Source, just like Mumble itself. The source code for the current version can be found in the Git repository in the file [[https://github.com/mumble-voip/mumble/blob/master/src/Mumble.proto Mumble.proto]].

=== Protocol documentation ====

A complete documentation about the protocol can be found at 
[[https://github.com/mumble-voip/mumble/raw/master/doc/mumble-protocol.pdf mumble-protocol.pdf]].

=== UDP Ping packet ===

Mumble supports querying the following data by sending a ping packet to the target server. Both the request and the response packets are formatted in Big Endian.

The ping request packet contains the following data:

^ Width ^ Data type ^ Value ^ Comment ^
| 4 bytes | int | 0 | Denotes the request type |
| 8 bytes | long long | ident | Used to identify the reponse. |


The response will then contain the following data: 

^ Width ^ Data type ^ Value ^ Comment ^
| 4 bytes | int | Version | e.g., \x0\x1\x2\x3 for 1.2.3. Can be interpreted as one single int or four signed chars. | 
| 8 bytes | long long | ident | the ident value sent with the request | 
| 4 bytes | int | Currently connected users count | | 
| 4 bytes | int | Maximum users (slot count) | | 
| 4 bytes | int | Allowed bandwidth | | 


The response will then contain the following data: [[https://gitorious.org/mumble-scripts/mumble-scripts/blobs/master/Non-RPC/mumble-ping.py|mumble-ping.py]]

==== Source ====
<file c qmumble.c>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>

#define MUM_QUERY_LENGTH 12
#define MUM_ANSWER_LENGTH 24
#define MUMBLE_DEF_PORT 64738

int query_mumble(char *ip, int port, int *client_nb, int *slots_nb) {
	struct sockaddr_in addr;
	int s;
	
	char query[] = "\0\0\0\0z2f4590h";
	char answer[24];
	
	if (client_nb == NULL || slots_nb == NULL) return 0;
	if (port == 0) port = MUMBLE_DEF_PORT;
	
	addr.sin_family = AF_INET;
	addr.sin_port = htons(port);
	if (inet_aton(ip, &addr.sin_addr)==0) return -1;
	if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1) return -2;
	
	if (sendto(s, query, MUM_QUERY_LENGTH, 0, &addr, sizeof(addr))==-1) return -3;
	if (recv(s, answer, MUM_ANSWER_LENGTH, 0)==-1) return -4;
	close(s);
	
	*client_nb  = *(answer+12) & 0xFF; *client_nb = *client_nb << 8;
	*client_nb += *(answer+13) & 0xFF; *client_nb = *client_nb << 8;
	*client_nb += *(answer+14) & 0xFF; *client_nb = *client_nb << 8;
	*client_nb += *(answer+15) & 0xFF;
	
	*slots_nb  = *(answer+16) & 0xFF; *slots_nb = *slots_nb << 8;
	*slots_nb += *(answer+17) & 0xFF; *slots_nb = *slots_nb << 8;
	*slots_nb += *(answer+18) & 0xFF; *slots_nb = *slots_nb << 8;
	*slots_nb += *(answer+19) & 0xFF;
	return 1;
}

int main(int argc, char *argv[]) {
	int res, a, b;
	res = query_mumble("88.191.129.216", 0, &a, &b);
	printf("%d/%d connectés\n", a, b);
	return res == 1 ? 0 : -1;
}

</file>
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