check_csgo.cpp
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#include "check_csgo.h"
#include <vector>
using namespace std;
char *servicename = (char*)"CS:GO";
void printVersion() {
cout << "check_csgo v" << VERSION << endl << endl;
}
void printHelp(bool longVersion) {
if(longVersion) {
printVersion();
cout << "Check CS:GO DS instance." << endl << endl;
printHelp(false);
cout << "Options:" << endl;
cout << " -h" << endl;
cout << " Print detailed help screen" << endl;
cout << " -V" << endl;
cout << " Print version information" << endl;
cout << " -H HOSTADDRESS" << endl;
cout << " Host where the Source DS is running" << endl;
cout << " -p" << endl;
cout << " Port where the Source DS is listening. Default is 27015." << endl << endl;
return;
}
cout << "Usage: " << endl << "check_csgo [-hV] -H HOSTADDRESS [-p PORT]" << endl << endl;
}
SOURCEDS_PACKET* getSourceDSResponse(int s, sockaddr_in *server) {
char *data = new char[DATAGRAM_LENGTH];
int dataLength = recvMsg(s, data, DATAGRAM_LENGTH, server);
if(dataLength == -1) {
return NULL;
}
char *header = (char*) "\xFF\xFF\xFF\xFF";
if(memcmp(data,header,HDR_SIZE)) {
//Invalid response, or non-supported multi-packet response format
return NULL;
}
SOURCEDS_PACKET *response = new SOURCEDS_PACKET;
response->data = data+HDR_SIZE;
response->length = dataLength;
return response;
}
int check_csgo(char *hostname, uint16_t port, SERVERINFO *server_info) {
struct sockaddr_in si;
struct hostent *host = NULL;
int s;
int timeout = 10;
setupSocket(port,hostname,host,timeout,&si,&s);
string discard;
std::vector<uint8_t> info_query;
info_query.resize(25);
memcpy(info_query.data(), "\xFF\xFF\xFF\xFF\x54Source Engine Query\x00", 25);
sendMsg(s, reinterpret_cast<char*>(info_query.data()), info_query.size(), &si);
SOURCEDS_PACKET *response = getSourceDSResponse(s,&si);
if(response == NULL) {
return 2;
}
if(response->data[0] == 'A') {
// Challenge response mechanism
uint32_t challenge;
size_t current_pkt_size = info_query.size();
info_query.resize(current_pkt_size + 4);
memcpy(info_query.data() + current_pkt_size, response->data+1, 4);
delete[] (response->data-HDR_SIZE);
delete response;
sendMsg(s, reinterpret_cast<char*>(info_query.data()), info_query.size(), &si);
response = getSourceDSResponse(s, &si);
if(response == NULL) {
return 2;
}
}
ssize_t offset = 2;
server_info->name = string(response->data+offset,strlen(response->data+offset));
offset += server_info->name.size()+1;
server_info->map = string(response->data+offset,strlen(response->data+offset));
offset += server_info->map.size()+1;
discard = string(response->data+offset,strlen(response->data+offset));
offset += discard.size() + 1;
server_info->game = string(response->data+offset,strlen(response->data+offset));
offset += server_info->game.size()+1;
offset += 2;
server_info->players = (uint8_t) *((response->data)+offset);
server_info->max_players = (uint8_t) *((response->data)+(++offset));
delete[] (response->data-HDR_SIZE);
delete response;
if(server_info->players == server_info->max_players) {
return 1;
}
return 0;
}
int main(int argc, char **argv) {
struct itimerval timer;
timer.it_value.tv_sec = 10;
timer.it_value.tv_usec = 0;
timer.it_interval.tv_sec = 0;
timer.it_interval.tv_usec = 0;
setitimer (ITIMER_VIRTUAL, &timer, 0);
struct sigaction sa;
memset (&sa, 0, sizeof (sa));
sa.sa_handler = &timer_handler;
sigaction (SIGVTALRM, &sa, 0);
uint16_t port = 27015;
char *hostname = NULL;
int c;
while ((c = getopt (argc, argv, "H:p:Vh")) != -1) {
switch(c) {
case 'H':
hostname = optarg;
break;
case 'p':
port = (uint16_t) str2int(optarg);
break;
case 'V':
printVersion();
return 0;
case 'h':
printHelp(true);
return 0;
case '?':
printHelp(false);
return 3;
}
}
if(hostname == NULL) {
cout << "No HOSTADDRESS specified. Exiting." << endl;
return 3;
}
SERVERINFO server_info;
int returnCode = check_csgo(hostname,port,&server_info);
cout << servicename;
switch(returnCode) {
case 0:
cout << " OK";
cout << " - " << hostname << " " << server_info.name << " " << server_info.game << " " << server_info.map
<< " " << (int)server_info.players << "/" << (int)server_info.max_players << " players" << endl ;
break;
case 1:
cout << " WARNING - Server is full";
break;
case 2:
cout << " CRITICAL - No response";
break;
}
return returnCode;
}