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#include "check_openvpn.h"
using namespace std;
char *servicename = (char*)"OpenVPN";
void printVersion()
{
cout << "check_openvpn v" << VERSION << endl << endl;
}
void printHelp(bool longVersion)
{
if(longVersion)
{
printVersion();
cout << "Check OpenVPN server" << 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 UPnP server is running" << endl;
cout << " -p PORT" << endl;
cout << " OpenVPN Administration port" << endl;
cout << " -P PASSWORD" << endl;
cout << " OpenVPN Administration password" << endl;
return;
}
cout << "Usage: " << endl << "check_openvpn [-hV] -H HOSTADDRESS -p PORT -P PASSWORD" << endl << endl;
}
int check_openvpn(uint16_t port, char *hostname, char *password, string *serverinfo)
{
size_t numClients = 0;
string ipList = "";
char buffer[MAX_TCP+1];
int s;
int timeout = 10;
int bytes = 0;
string output = "";
s = createSocket();
connect(s,port,hostname,timeout);
while(output != "ENTER PASSWORD:")
{
recvMsg(s,buffer,MAX_TCP);
output += buffer;
memset(buffer,0x00,MAX_TCP+1);
}
sendMsg(s,strcat(password,"\n"),strlen(password)+1);
output = "";
do
{
bytes = recvMsg(s,buffer,MAX_TCP);
output += buffer;
memset(buffer,0x00,MAX_TCP+1);
}while(bytes);
if(output == "ENTER PASSWORD:")
{
*serverinfo = "Incorrect password";
close(s);
return 3;
}
output = "";
sendMsg(s,(char*)"status 2\n",9);
do
{
bytes = recvMsg(s,buffer,MAX_TCP);
output += buffer;
memset(buffer,0x00,MAX_TCP+1);
}while(output.rfind("END") != output.size()-5);
vector<string> splitstr;
vector<string> fields;
split(output,"\n",splitstr);
for(vector<string>::iterator it = splitstr.begin() ; it != splitstr.end(); ++it)
{
if(it->substr(0,11) == "CLIENT_LIST")
{
split(*it,",",fields);
ipList += fields[3] + ",";
numClients++;
}
}
if(numClients)
{
ipList.pop_back();
}
*serverinfo = int2str(numClients) + " clients connected (" + ipList + ")" ;
close(s);
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 = 1195;
char *hostname = NULL;
char *password = NULL;
int c;
while ((c = getopt (argc, argv, "H:p:P:Vh")) != -1)
{
switch(c)
{
case 'H':
hostname = optarg;
break;
case 'p':
port = (uint16_t) str2int(optarg);
break;
case 'P':
password = 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;
}
if(password == NULL)
{
cout << "No PASSWORD specified. Exiting." << endl;
return 3;
}
string serverinfo = "";
int returnCode = check_openvpn(port,hostname,password,&serverinfo);
cout << servicename;
switch(returnCode)
{
case 0:
cout << " OK - " << serverinfo << endl ;
break;
case 2:
cout << " CRITICAL - No response" << endl;
break;
case 3:
cout << " UNKNOWN - " << serverinfo << endl;
}
return returnCode;
}
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