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// Cyphesis Online RPG Server and AI Engine
// Copyright (C) 2000,2001 Alistair Riddoch
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
// $Id: CommMetaClient.cpp,v 1.19 2007-08-20 16:35:56 alriddoch Exp $
#include "CommMetaClient.h"
#include "common/debug.h"
#include "common/log.h"
#include "common/globals.h"
#include <cstring>
#include <iostream>
static const bool debug_flag = false;
static const uint32_t SKEEP_ALIVE = 1;
static const uint32_t CKEEP_ALIVE = 2;
static const uint32_t HANDSHAKE = 3;
static const uint32_t SERVERSHAKE = 4;
static const uint32_t CLIENTSHAKE = 5;
static const uint32_t TERMINATE = 6;
static const uint32_t LIST_REQ = 7;
static const uint32_t LIST_RESP = 8;
static const uint32_t PROTO_ERANGE = 9;
static inline char *pack_uint32(uint32_t data, char *buffer, unsigned int *size)
{
uint32_t netorder;
netorder = htonl(data);
memcpy(buffer, &netorder, sizeof(uint32_t));
*size += sizeof(uint32_t);
return buffer+sizeof(uint32_t);
}
static inline char *unpack_uint32(uint32_t *dest, char *buffer)
{
uint32_t netorder;
memcpy(&netorder, buffer, sizeof(uint32_t));
*dest = ntohl(netorder);
return buffer+sizeof(uint32_t);
}
/// \brief Constructor for metaserver communication socket object.
///
/// @param svr Reference to the object that manages all socket communication.
CommMetaClient::CommMetaClient(CommServer & svr) : Idle(svr), CommSocket(svr),
m_lastTime(-1)
{
}
CommMetaClient::~CommMetaClient()
{
metaserverTerminate();
}
int CommMetaClient::getFd() const
{
return m_clientIos.getSocket();
}
bool CommMetaClient::eof()
{
return m_clientIos.peek() == EOF;
}
bool CommMetaClient::isOpen() const
{
return true;
}
int CommMetaClient::read()
{
metaserverReply();
return 0;
}
void CommMetaClient::dispatch()
{
}
/// \brief Set the target address if the communication socket.
///
/// @param mserver String address of the metaserver,
int CommMetaClient::setup(const std::string & mserver)
{
// Establish socket for communication with the metaserver
bool success = m_clientIos.setTarget(mserver, m_metaserverPort);
return success ? 0 : -1;
}
static const int MAXLINE = 4096;
/// \brief Send a keepalive packet to the metaserver.
///
/// This should be called periodically to send a packet notifying the
/// metaserver that this server is still alive.
void CommMetaClient::metaserverKeepalive()
{
char mesg[MAXLINE];
unsigned int packet_size = 0;
pack_uint32(SKEEP_ALIVE, mesg, &packet_size);
m_clientIos.write(mesg, packet_size);
m_clientIos << std::flush;
}
/// \brief Read a reply from the metaserver.
///
/// Read the data sent by the metaserver. If the packet received is
/// a handshake, respond with the required response to verify that
/// we are alive.
void CommMetaClient::metaserverReply()
{
char mesg[MAXLINE];
char *mesg_ptr;
uint32_t handshake = 0, command = 0;
unsigned int packet_size;
if (m_clientIos.readsome(mesg, MAXLINE) < (std::streamsize)sizeof(command)) {
log(WARNING, "WARNING: Reply from metaserver too short");
return;
}
mesg_ptr = unpack_uint32(&command, mesg);
if(command == HANDSHAKE)
{
mesg_ptr = unpack_uint32(&handshake, mesg_ptr);
debug(std::cout << "MetaServer contacted successfully."
<< std::endl << std::flush;);
packet_size = 0;
mesg_ptr = pack_uint32(SERVERSHAKE, mesg, &packet_size);
mesg_ptr = pack_uint32(handshake, mesg_ptr, &packet_size);
m_clientIos.write(mesg, packet_size);
m_clientIos << std::flush;
}
}
/// \brief Send a terminate packet to the metaserver.
///
/// This should be called to indicate that this server is going down,
/// and should no longer be listed.
void CommMetaClient::metaserverTerminate()
{
char mesg[MAXLINE];
unsigned int packet_size = 0;
pack_uint32(TERMINATE, mesg, &packet_size);
m_clientIos.write(mesg, packet_size);
m_clientIos << std::flush;
}
void CommMetaClient::idle(time_t t)
{
if (t > (m_lastTime + 5 * 60)) {
m_lastTime = t;
metaserverKeepalive();
}
}
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