/**
* @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() );
}
}
int main(int argc, char** argv)
{
/**
* Argument Wrangling
*
*/
boost::program_options::options_description desc( "TestClient" );
boost::program_options::variables_map vm;
boost::asio::io_service io_service;
std::array<char, MAX_PACKET_BYTES> recvBuffer;
boost::asio::ip::udp::endpoint sender_endpoint;
size_t bytes_recvd;
/**
* Note: options inside the configuration file that are NOT listed here
* become ignored and are not accessible.
*/
desc.add_options()
( "help,h", "Display help message" )
( "server", boost::program_options::value<std::string>()->default_value("localhost"), "MetaServer host. \nDefault:localhost" )
( "port", boost::program_options::value<int>()->default_value(8453), "MetaServer port. \nDefault:8453" )
( "attribute", boost::program_options::value<attribute_list>(), "Set client attribute.\nDefault: none" )
( "filter", boost::program_options::value<attribute_list>(), "Set client filters.\nDefault: none" )
( "keepalives", boost::program_options::value<int>()->default_value(3), "Number of Keepalives. \nDefault:3" )
;
try
{
boost::program_options::store(
boost::program_options::parse_command_line(argc, argv, desc),
vm
);
boost::program_options::notify(vm);
/**
* Special case for help
*/
if ( vm.count("help") )
{
std::cout << desc << std::endl;
return 0;
}
std::cout << "Server : " << vm["server"].as<std::string>() << std::endl;
std::cout << "Port : " << vm["port"].as<int>() << std::endl;
std::cout << "Keepalives : " << vm["keepalives"].as<int>() << std::endl;
std::cout << "---------------" << std::endl;
for (boost::program_options::variables_map::iterator it=vm.begin(); it!=vm.end(); ++it )
{
if ( it->second.value().type() == typeid(int) )
{
std::cout << it->first.c_str() << "=" << it->second.as<int>() << std::endl;
}
else if (it->second.value().type() == typeid(std::string) )
{
std::cout << it->first.c_str() << "=" << it->second.as<std::string>().c_str() << std::endl;
}
else if (it->second.value().type() == typeid(attribute_list) )
{
std::cout << it->first.c_str() << "=Attribute List" << std::endl;
}
}
std::cout << "-------------------------" << std::endl;
/**
* because boost query is too stupid to take port as an int
*/
std::stringstream port_str;
port_str << vm["port"].as<int>();
boost::asio::ip::udp::socket s(io_service, boost::asio::ip::udp::endpoint(boost::asio::ip::udp::v4(), 0));
boost::asio::ip::udp::resolver resolver(io_service);
boost::asio::ip::udp::resolver::query query(boost::asio::ip::udp::v4(), vm["server"].as<std::string>(), port_str.str() );
boost::asio::ip::udp::resolver::iterator iterator = resolver.resolve(query);
/**
* Step 1 : keepalive x3 w/ sleep
*/
/**
* 1.1 - send keepalive
*/
for ( int i=0 ; i < vm["keepalives"].as<int>() ; ++i )
{
MetaServerPacket keep;
keep.setPacketType(NMT_CLIENTKEEPALIVE);
std::cout << "Sending keepalive ... ";
s.send_to(boost::asio::buffer(keep.getBuffer(), keep.getSize()), *iterator );
/**
* 1.2 - receive handshake
*/
bytes_recvd = s.receive_from( boost::asio::buffer(recvBuffer), sender_endpoint );
MetaServerPacket shake( recvBuffer, bytes_recvd );
shake.setAddress(sender_endpoint.address().to_string());
shake.setPort(sender_endpoint.port());
std::cout << "Got handshake ... ";
unsigned int shake_key = shake.getIntData(4);
/**
* 1.3 - send clientshake
*/
MetaServerPacket clientshake;
clientshake.setPacketType(NMT_CLIENTSHAKE);
clientshake.addPacketData(shake_key);
clientshake.setAddress( shake.getAddress() );
s.send_to(boost::asio::buffer(clientshake.getBuffer(), clientshake.getSize()), *iterator );
std::cout << "Sending registration." << std::endl;
//std::cout << "Sleeping between keepalives : 2s" << std::endl;
//sleep(2);
}
/**
* Step 2 : register attributes if any
*/
if ( vm.count("attribute") )
{
std::cout << "Registering Client Attributes: " << std::endl;
attribute_list v = vm["attribute"].as<attribute_list>();
while(!v.empty())
{
std::string ele = v.back();
size_t pos = ele.find_first_of("=");
if( pos != std::string::npos )
{
std::string n = ele.substr(0,pos);
std::string v = ele.substr(pos+1);
std::cout << " register: " << n << std::endl;
std::cout << " value: " << v << std::endl;
MetaServerPacket a;
a.setPacketType(NMT_CLIENTATTR);
a.addPacketData(n.length());
a.addPacketData(v.length());
a.addPacketData(n);
a.addPacketData(v);
s.send_to(boost::asio::buffer(a.getBuffer(), a.getSize()), *iterator );
}
else
{
std::cout << " Attribute Ignored : " << ele << std::endl;
}
v.pop_back();
}
}
/**
* Step 3 : register filters
*/
if ( vm.count("filter") )
{
std::cout << "Registering Client Filters: " << std::endl;
attribute_list v = vm["filter"].as<attribute_list>();
while(!v.empty())
{
std::string ele = v.back();
size_t pos = ele.find_first_of("=");
if( pos != std::string::npos )
{
std::string n = ele.substr(0,pos);
std::string v = ele.substr(pos+1);
std::cout << " register: " << n << std::endl;
std::cout << " value: " << v << std::endl;
MetaServerPacket a;
a.setPacketType(NMT_CLIENTFILTER);
a.addPacketData(n.length());
a.addPacketData(v.length());
a.addPacketData(n);
a.addPacketData(v);
s.send_to(boost::asio::buffer(a.getBuffer(), a.getSize()), *iterator );
}
else
{
std::cout << " Filter Ignored : " << ele << std::endl;
}
v.pop_back();
}
}
/**
* Step 4 : send listreq
*/
unsigned int total=1;
unsigned int from=0;
unsigned int packed=0;
unsigned int count=0;
while(1)
{
if ( from > total || total == 0 )
break;
std::cout << "List Request: " << std::endl;
MetaServerPacket req;
req.setPacketType(NMT_LISTREQ);
req.addPacketData(from);
req.setAddress( sender_endpoint.address().to_string() );
req.setPort( sender_endpoint.port() );
s.send_to(boost::asio::buffer(req.getBuffer(), req.getSize()), *iterator );
bytes_recvd = s.receive_from( boost::asio::buffer(recvBuffer), sender_endpoint );
MetaServerPacket resp( recvBuffer, bytes_recvd );
resp.setAddress(sender_endpoint.address().to_string());
resp.setPort(sender_endpoint.port());
if ( resp.getPacketType() != NMT_LISTRESP || resp.getPacketType() == NMT_PROTO_ERANGE )
break;
std::cout << "Received server list packet";
total = resp.getIntData(sizeof(uint32_t)*1); // 4
packed = resp.getIntData(sizeof(uint32_t)*2); // 8
std::cout << " Received " << packed << " / " << total << " servers." << std::endl;
for ( count = 1 ; count <= packed; count++ )
{
unsigned int offset = (sizeof(uint32_t)*2) + (sizeof(uint32_t)*count);
//std::cout << " " << count << " / " << offset << " == ";
uint32_t ip = resp.getIntData(offset);
//std::cout << ip << std::endl;
std::cout << "Server: " << resp.IpNetToAscii(ip) << std::endl;
}
from += packed;
}
/**
* Step 4: send terminate
*/
std::cout << "Sending Terminate: " << std::endl;
MetaServerPacket term;
term.setPacketType(NMT_TERMINATE);
term.addPacketData(0); // increase size of term packet to indicate client
term.setAddress( sender_endpoint.address().to_string() );
term.setPort( sender_endpoint.port() );
s.send_to(boost::asio::buffer(term.getBuffer(), term.getSize()), *iterator );
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << std::endl;
}
std::cout << "All Done!" << std::endl;
return 0;
}
/**
* 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 );
}
}