/**
* @param in incoming metaserver packet
*
* NMT_SERVERKEEPALIVE indicates a keep alive for a server, also serves as a "registration"
* Response Packet Type: NMT_HANDSHAKE
* - pack packet type
* - pack random number
*/
void
MetaServer::processSERVERKEEPALIVE(const MetaServerPacket& in, MetaServerPacket& out)
{
uint32_t i = msdo.addHandshake();
if ( i > 0 )
{
m_Logger.debug("processSERVERKEEPALIVE(%u)", i);
out.setPacketType(NMT_HANDSHAKE);
out.addPacketData(i);
out.setAddress( in.getAddress() );
}
}
/**
* NMT_LISTREQ:
* 4 bytes type
* 4 bytes start index
*
* Response:
*
* NMT_LISTRESP
*
* 4 bytes type
* 4 bytes total servers in list
* 4 bytes servers in this packet ( triggering client to have another REQ with total-servers offset )
* 4 bytes per server in this packet
*
*/
void
MetaServer::processLISTREQ( const MetaServerPacket& in, MetaServerPacket& out)
{
uint32_t server_index = in.getIntData(4);
uint32_t total = msdo.getServerSessionCount();
uint32_t packed_max = total;
uint32_t packed = 0;
std::list<uint32_t> resp_list;
/*
* If we are unable to pack the entire list into 1 packet
*/
if ( (total*sizeof(uint32_t) - (server_index*sizeof(uint32_t)) ) > (MAX_UDP_OUT_BYTES-4-4-4) )
{
/*
* We want it to round ... just like the price is right, the goal is not to go over
*/
packed_max = (MAX_UDP_OUT_BYTES-4-4-4) / sizeof(uint32_t);
}
/*
* We hide the craziness of what goes on here inside the single method.
* The goal, is to get the list of servers constrained by packed_max
*/
std::list<std::string> sess_list = msdo.getServerSessionList(server_index,packed_max);
std::list<std::string>::iterator list_itr;
for ( list_itr = sess_list.begin(); list_itr != sess_list.end() ; list_itr++ )
{
/*
* Defensive to make sure we're not going to exceed our max
*/
if ( packed >= packed_max )
break;
/*
* Defensive to make sure that the item in the list is
* actually a valid data item we can send ( orthogonal processes
* such as expiry could invalidate at any time ).
*
* Thus we can iterate over as much of the server list as we need to
* and dead items won't count, only those added to the response packet.
*/
if ( msdo.serverSessionExists( *list_itr ))
{
/*
* Note: see if there is a way to do this without atoi
*/
resp_list.push_back( atoi( msdo.getServerSession(*list_itr)["ip_int"].c_str() ) );
++packed;
}
}
if ( packed != resp_list.size() )
{
m_Logger.warn("Packed (%u) vs Response(%u) MISMATCH!", packed, resp_list.size() );
}
out.setAddress( in.getAddress() );
out.setPacketType(NMT_LISTRESP);
/**
* If the list is empty, just send a 0,0 to indicate completion.
* NOTE: I think this logic is a bug in the protocol, as the
* original MS code looks as if this was just not working correctly.
*/
if ( resp_list.size() > 0 )
{
out.addPacketData( msdo.getServerSessionCount() );
out.addPacketData( (uint32_t)resp_list.size() );
while ( ! resp_list.empty() )
{
m_Logger.debug("processLISTRESP(%d) - Adding", resp_list.front() );
out.addPacketData(resp_list.front());
resp_list.pop_front();
}
}
else
{
/*
* For the record, I think this is a stupid protocol construct
*/
m_Logger.debug("processLISTRESP(0,0) - Empty");
out.addPacketData( 0 );
out.addPacketData( 0 );
}
}