int ICMPSocketImpl::receiveFrom(void*, int, SocketAddress& address, int flags)
{
int maxPacketSize = _icmpPacket.maxPacketSize();
unsigned char* buffer = new unsigned char[maxPacketSize];
try
{
Poco::Timestamp ts;
do
{
if (ts.isElapsed(_timeout))
{
// This guards against a possible DoS attack, where sending
// fake ping responses will cause an endless loop.
throw TimeoutException();
}
SocketImpl::receiveFrom(buffer, maxPacketSize, address, flags);
}
while (!_icmpPacket.validReplyID(buffer, maxPacketSize));
}
catch (TimeoutException&)
{
delete [] buffer;
throw;
}
catch (Exception&)
{
std::string err = _icmpPacket.errorDescription(buffer, maxPacketSize);
delete [] buffer;
if (!err.empty())
throw ICMPException(err);
else
throw;
}
struct timeval then = _icmpPacket.time(buffer, maxPacketSize);
struct timeval now = _icmpPacket.time();
int elapsed = (((now.tv_sec * 1000000) + now.tv_usec) - ((then.tv_sec * 1000000) + then.tv_usec))/1000;
delete[] buffer;
return elapsed;
}
int ICMPSocketImpl::receiveFrom(void*, int, SocketAddress& address, int flags)
{
int maxPacketSize = _icmpPacket.maxPacketSize();
unsigned char* buffer = new unsigned char[maxPacketSize];
try
{
do
{
SocketImpl::receiveFrom(buffer, maxPacketSize, address, flags);
}
while(!_icmpPacket.validReplyID(buffer, maxPacketSize));
}
catch (TimeoutException&)
{
delete[] buffer;
throw;
}
catch (Exception&)
{
std::string err = _icmpPacket.errorDescription(buffer, maxPacketSize);
delete[] buffer;
if (!err.empty())
throw ICMPException(err);
else
throw;
}
struct timeval then = _icmpPacket.time(buffer, maxPacketSize);
struct timeval now = _icmpPacket.time();
int elapsed = (((now.tv_sec * 1000000) + now.tv_usec) - ((then.tv_sec * 1000000) + then.tv_usec))/1000;
delete[] buffer;
return elapsed;
}