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path: root/0001-Enabled-mastersrv-and-versionsrv-as-they-are-require.patch
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From b560395a680471426dc2e93a68eb3be79bb1b8f9 Mon Sep 17 00:00:00 2001
From: Rafael Ferreira <rafael.f.f1@gmail.com>
Date: Fri, 22 Aug 2014 06:14:03 -0300
Subject: [PATCH] Enabled mastersrv and versionsrv as they are required

---
 .gitignore                    |   3 +-
 src/mastersrv/mastersrv.cpp   | 542 ++++++++++++++++++++++++++++++++++++++++++
 src/mastersrv/mastersrv.h     |  52 ++++
 src/versionsrv/mapversions.h  |  22 ++
 src/versionsrv/versionsrv.cpp | 133 +++++++++++
 src/versionsrv/versionsrv.h   |  19 ++
 6 files changed, 769 insertions(+), 2 deletions(-)
 create mode 100644 src/mastersrv/mastersrv.cpp
 create mode 100644 src/mastersrv/mastersrv.h
 create mode 100644 src/versionsrv/mapversions.h
 create mode 100644 src/versionsrv/versionsrv.cpp
 create mode 100644 src/versionsrv/versionsrv.h

diff --git a/.gitignore b/.gitignore
index 4b1a4ad..93efac2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,9 +16,8 @@ dilate*
 fake_server*
 map_resave*
 map_version*
-mastersrv*
 packetgen*
 teeworlds*
 teeworlds_srv*
 tileset_border*
-versionsrv*
+
diff --git a/src/mastersrv/mastersrv.cpp b/src/mastersrv/mastersrv.cpp
new file mode 100644
index 0000000..954650a
--- /dev/null
+++ b/src/mastersrv/mastersrv.cpp
@@ -0,0 +1,542 @@
+/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
+/* If you are missing that file, acquire a complete release at teeworlds.com.                */
+#include <base/system.h>
+
+#include <engine/config.h>
+#include <engine/console.h>
+#include <engine/kernel.h>
+#include <engine/storage.h>
+
+#include <engine/shared/config.h>
+#include <engine/shared/netban.h>
+#include <engine/shared/network.h>
+
+#include "mastersrv.h"
+
+
+enum {
+	MTU = 1400,
+	MAX_SERVERS_PER_PACKET=75,
+	MAX_PACKETS=16,
+	MAX_SERVERS=MAX_SERVERS_PER_PACKET*MAX_PACKETS,
+	EXPIRE_TIME = 90
+};
+
+struct CCheckServer
+{
+	enum ServerType m_Type;
+	NETADDR m_Address;
+	NETADDR m_AltAddress;
+	int m_TryCount;
+	int64 m_TryTime;
+};
+
+static CCheckServer m_aCheckServers[MAX_SERVERS];
+static int m_NumCheckServers = 0;
+
+struct CServerEntry
+{
+	enum ServerType m_Type;
+	NETADDR m_Address;
+	int64 m_Expire;
+};
+
+static CServerEntry m_aServers[MAX_SERVERS];
+static int m_NumServers = 0;
+
+struct CPacketData
+{
+	int m_Size;
+	struct {
+		unsigned char m_aHeader[sizeof(SERVERBROWSE_LIST)];
+		CMastersrvAddr m_aServers[MAX_SERVERS_PER_PACKET];
+	} m_Data;
+};
+
+CPacketData m_aPackets[MAX_PACKETS];
+static int m_NumPackets = 0;
+
+// legacy code
+struct CPacketDataLegacy
+{
+	int m_Size;
+	struct {
+		unsigned char m_aHeader[sizeof(SERVERBROWSE_LIST_LEGACY)];
+		CMastersrvAddrLegacy m_aServers[MAX_SERVERS_PER_PACKET];
+	} m_Data;
+};
+
+CPacketDataLegacy m_aPacketsLegacy[MAX_PACKETS];
+static int m_NumPacketsLegacy = 0;
+
+
+struct CCountPacketData
+{
+	unsigned char m_Header[sizeof(SERVERBROWSE_COUNT)];
+	unsigned char m_High;
+	unsigned char m_Low;
+};
+
+static CCountPacketData m_CountData;
+static CCountPacketData m_CountDataLegacy;
+
+
+CNetBan m_NetBan;
+
+static CNetClient m_NetChecker; // NAT/FW checker
+static CNetClient m_NetOp; // main
+
+IConsole *m_pConsole;
+
+void BuildPackets()
+{
+	CServerEntry *pCurrent = &m_aServers[0];
+	int ServersLeft = m_NumServers;
+	m_NumPackets = 0;
+	m_NumPacketsLegacy = 0;
+	int PacketIndex = 0;
+	int PacketIndexLegacy = 0;
+	while(ServersLeft-- && (m_NumPackets + m_NumPacketsLegacy) < MAX_PACKETS)
+	{
+		if(pCurrent->m_Type == SERVERTYPE_NORMAL)
+		{
+			if(PacketIndex % MAX_SERVERS_PER_PACKET == 0)
+			{
+				PacketIndex = 0;
+				m_NumPackets++;
+			}
+
+			// copy header
+			mem_copy(m_aPackets[m_NumPackets-1].m_Data.m_aHeader, SERVERBROWSE_LIST, sizeof(SERVERBROWSE_LIST));
+
+			// copy server addresses
+			if(pCurrent->m_Address.type == NETTYPE_IPV6)
+			{
+				mem_copy(m_aPackets[m_NumPackets-1].m_Data.m_aServers[PacketIndex].m_aIp, pCurrent->m_Address.ip,
+					sizeof(m_aPackets[m_NumPackets-1].m_Data.m_aServers[PacketIndex].m_aIp));
+			}
+			else
+			{
+				static unsigned char s_aIPV4Mapping[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF};
+
+				mem_copy(m_aPackets[m_NumPackets-1].m_Data.m_aServers[PacketIndex].m_aIp, s_aIPV4Mapping, sizeof(s_aIPV4Mapping));
+				m_aPackets[m_NumPackets-1].m_Data.m_aServers[PacketIndex].m_aIp[12] = pCurrent->m_Address.ip[0];
+				m_aPackets[m_NumPackets-1].m_Data.m_aServers[PacketIndex].m_aIp[13] = pCurrent->m_Address.ip[1];
+				m_aPackets[m_NumPackets-1].m_Data.m_aServers[PacketIndex].m_aIp[14] = pCurrent->m_Address.ip[2];
+				m_aPackets[m_NumPackets-1].m_Data.m_aServers[PacketIndex].m_aIp[15] = pCurrent->m_Address.ip[3];
+			}
+
+			m_aPackets[m_NumPackets-1].m_Data.m_aServers[PacketIndex].m_aPort[0] = (pCurrent->m_Address.port>>8)&0xff;
+			m_aPackets[m_NumPackets-1].m_Data.m_aServers[PacketIndex].m_aPort[1] = pCurrent->m_Address.port&0xff;
+
+			PacketIndex++;
+
+			m_aPackets[m_NumPackets-1].m_Size = sizeof(SERVERBROWSE_LIST) + sizeof(CMastersrvAddr)*PacketIndex;
+
+			pCurrent++;
+		}
+		else if(pCurrent->m_Type == SERVERTYPE_LEGACY)
+		{
+			if(PacketIndexLegacy % MAX_SERVERS_PER_PACKET == 0)
+			{
+				PacketIndexLegacy = 0;
+				m_NumPacketsLegacy++;
+			}
+
+			// copy header
+			mem_copy(m_aPacketsLegacy[m_NumPacketsLegacy-1].m_Data.m_aHeader, SERVERBROWSE_LIST_LEGACY, sizeof(SERVERBROWSE_LIST_LEGACY));
+
+			// copy server addresses
+			mem_copy(m_aPacketsLegacy[m_NumPacketsLegacy-1].m_Data.m_aServers[PacketIndexLegacy].m_aIp, pCurrent->m_Address.ip,
+				sizeof(m_aPacketsLegacy[m_NumPacketsLegacy-1].m_Data.m_aServers[PacketIndexLegacy].m_aIp));
+			// 0.5 has the port in little endian on the network
+			m_aPacketsLegacy[m_NumPacketsLegacy-1].m_Data.m_aServers[PacketIndexLegacy].m_aPort[0] = pCurrent->m_Address.port&0xff;
+			m_aPacketsLegacy[m_NumPacketsLegacy-1].m_Data.m_aServers[PacketIndexLegacy].m_aPort[1] = (pCurrent->m_Address.port>>8)&0xff;
+
+			PacketIndexLegacy++;
+
+			m_aPacketsLegacy[m_NumPacketsLegacy-1].m_Size = sizeof(SERVERBROWSE_LIST_LEGACY) + sizeof(CMastersrvAddrLegacy)*PacketIndexLegacy;
+
+			pCurrent++;
+		}
+		else
+		{
+			*pCurrent = m_aServers[m_NumServers-1];
+			m_NumServers--;
+			dbg_msg("mastersrv", "error: server of invalid type, dropping it");
+		}
+	}
+}
+
+void SendOk(NETADDR *pAddr)
+{
+	CNetChunk p;
+	p.m_ClientID = -1;
+	p.m_Address = *pAddr;
+	p.m_Flags = NETSENDFLAG_CONNLESS;
+	p.m_DataSize = sizeof(SERVERBROWSE_FWOK);
+	p.m_pData = SERVERBROWSE_FWOK;
+
+	// send on both to be sure
+	m_NetChecker.Send(&p);
+	m_NetOp.Send(&p);
+}
+
+void SendError(NETADDR *pAddr)
+{
+	CNetChunk p;
+	p.m_ClientID = -1;
+	p.m_Address = *pAddr;
+	p.m_Flags = NETSENDFLAG_CONNLESS;
+	p.m_DataSize = sizeof(SERVERBROWSE_FWERROR);
+	p.m_pData = SERVERBROWSE_FWERROR;
+	m_NetOp.Send(&p);
+}
+
+void SendCheck(NETADDR *pAddr)
+{
+	CNetChunk p;
+	p.m_ClientID = -1;
+	p.m_Address = *pAddr;
+	p.m_Flags = NETSENDFLAG_CONNLESS;
+	p.m_DataSize = sizeof(SERVERBROWSE_FWCHECK);
+	p.m_pData = SERVERBROWSE_FWCHECK;
+	m_NetChecker.Send(&p);
+}
+
+void AddCheckserver(NETADDR *pInfo, NETADDR *pAlt, ServerType Type)
+{
+	// add server
+	if(m_NumCheckServers == MAX_SERVERS)
+	{
+		dbg_msg("mastersrv", "error: mastersrv is full");
+		return;
+	}
+
+	char aAddrStr[NETADDR_MAXSTRSIZE];
+	net_addr_str(pInfo, aAddrStr, sizeof(aAddrStr), true);
+	char aAltAddrStr[NETADDR_MAXSTRSIZE];
+	net_addr_str(pAlt, aAltAddrStr, sizeof(aAltAddrStr), true);
+	dbg_msg("mastersrv", "checking: %s (%s)", aAddrStr, aAltAddrStr);
+	m_aCheckServers[m_NumCheckServers].m_Address = *pInfo;
+	m_aCheckServers[m_NumCheckServers].m_AltAddress = *pAlt;
+	m_aCheckServers[m_NumCheckServers].m_TryCount = 0;
+	m_aCheckServers[m_NumCheckServers].m_TryTime = 0;
+	m_aCheckServers[m_NumCheckServers].m_Type = Type;
+	m_NumCheckServers++;
+}
+
+void AddServer(NETADDR *pInfo, ServerType Type)
+{
+	// see if server already exists in list
+	for(int i = 0; i < m_NumServers; i++)
+	{
+		if(net_addr_comp(&m_aServers[i].m_Address, pInfo) == 0)
+		{
+			char aAddrStr[NETADDR_MAXSTRSIZE];
+			net_addr_str(pInfo, aAddrStr, sizeof(aAddrStr), true);
+			dbg_msg("mastersrv", "updated: %s", aAddrStr);
+			m_aServers[i].m_Expire = time_get()+time_freq()*EXPIRE_TIME;
+			return;
+		}
+	}
+
+	// add server
+	if(m_NumServers == MAX_SERVERS)
+	{
+		dbg_msg("mastersrv", "error: mastersrv is full");
+		return;
+	}
+
+	char aAddrStr[NETADDR_MAXSTRSIZE];
+	net_addr_str(pInfo, aAddrStr, sizeof(aAddrStr), true);
+	dbg_msg("mastersrv", "added: %s", aAddrStr);
+	m_aServers[m_NumServers].m_Address = *pInfo;
+	m_aServers[m_NumServers].m_Expire = time_get()+time_freq()*EXPIRE_TIME;
+	m_aServers[m_NumServers].m_Type = Type;
+	m_NumServers++;
+}
+
+void UpdateServers()
+{
+	int64 Now = time_get();
+	int64 Freq = time_freq();
+	for(int i = 0; i < m_NumCheckServers; i++)
+	{
+		if(Now > m_aCheckServers[i].m_TryTime+Freq)
+		{
+			if(m_aCheckServers[i].m_TryCount == 10)
+			{
+				char aAddrStr[NETADDR_MAXSTRSIZE];
+				net_addr_str(&m_aCheckServers[i].m_Address, aAddrStr, sizeof(aAddrStr), true);
+				char aAltAddrStr[NETADDR_MAXSTRSIZE];
+				net_addr_str(&m_aCheckServers[i].m_AltAddress, aAltAddrStr, sizeof(aAltAddrStr), true);
+				dbg_msg("mastersrv", "check failed: %s (%s)", aAddrStr, aAltAddrStr);
+
+				// FAIL!!
+				SendError(&m_aCheckServers[i].m_Address);
+				m_aCheckServers[i] = m_aCheckServers[m_NumCheckServers-1];
+				m_NumCheckServers--;
+				i--;
+			}
+			else
+			{
+				m_aCheckServers[i].m_TryCount++;
+				m_aCheckServers[i].m_TryTime = Now;
+				if(m_aCheckServers[i].m_TryCount&1)
+					SendCheck(&m_aCheckServers[i].m_Address);
+				else
+					SendCheck(&m_aCheckServers[i].m_AltAddress);
+			}
+		}
+	}
+}
+
+void PurgeServers()
+{
+	int64 Now = time_get();
+	int i = 0;
+	while(i < m_NumServers)
+	{
+		if(m_aServers[i].m_Expire < Now)
+		{
+			// remove server
+			char aAddrStr[NETADDR_MAXSTRSIZE];
+			net_addr_str(&m_aServers[i].m_Address, aAddrStr, sizeof(aAddrStr), true);
+			dbg_msg("mastersrv", "expired: %s", aAddrStr);
+			m_aServers[i] = m_aServers[m_NumServers-1];
+			m_NumServers--;
+		}
+		else
+			i++;
+	}
+}
+
+void ReloadBans()
+{
+	m_NetBan.UnbanAll();
+	m_pConsole->ExecuteFile("master.cfg");
+}
+
+int main(int argc, const char **argv) // ignore_convention
+{
+	int64 LastBuild = 0, LastBanReload = 0;
+	ServerType Type = SERVERTYPE_INVALID;
+	NETADDR BindAddr;
+
+	dbg_logger_stdout();
+	net_init();
+
+	mem_copy(m_CountData.m_Header, SERVERBROWSE_COUNT, sizeof(SERVERBROWSE_COUNT));
+	mem_copy(m_CountDataLegacy.m_Header, SERVERBROWSE_COUNT_LEGACY, sizeof(SERVERBROWSE_COUNT_LEGACY));
+
+	IKernel *pKernel = IKernel::Create();
+	IStorage *pStorage = CreateStorage("Teeworlds", IStorage::STORAGETYPE_BASIC, argc, argv);
+	IConfig *pConfig = CreateConfig();
+	m_pConsole = CreateConsole(CFGFLAG_MASTER);
+	
+	bool RegisterFail = !pKernel->RegisterInterface(pStorage);
+	RegisterFail |= !pKernel->RegisterInterface(m_pConsole);
+	RegisterFail |= !pKernel->RegisterInterface(pConfig);
+
+	if(RegisterFail)
+		return -1;
+
+	pConfig->Init();
+	m_NetBan.Init(m_pConsole, pStorage);
+	if(argc > 1) // ignore_convention
+		m_pConsole->ParseArguments(argc-1, &argv[1]); // ignore_convention
+
+	if(g_Config.m_Bindaddr[0] && net_host_lookup(g_Config.m_Bindaddr, &BindAddr, NETTYPE_ALL) == 0)
+	{
+		// got bindaddr
+		BindAddr.type = NETTYPE_ALL;
+		BindAddr.port = MASTERSERVER_PORT;
+	}
+	else
+	{
+		mem_zero(&BindAddr, sizeof(BindAddr));
+		BindAddr.type = NETTYPE_ALL;
+		BindAddr.port = MASTERSERVER_PORT;
+	}
+
+	if(!m_NetOp.Open(BindAddr, 0))
+	{
+		dbg_msg("mastersrv", "couldn't start network (op)");
+		return -1;
+	}
+	BindAddr.port = MASTERSERVER_PORT+1;
+	if(!m_NetChecker.Open(BindAddr, 0))
+	{
+		dbg_msg("mastersrv", "couldn't start network (checker)");
+		return -1;
+	}
+
+	// process pending commands
+	m_pConsole->StoreCommands(false);
+
+	dbg_msg("mastersrv", "started");
+
+	while(1)
+	{
+		m_NetOp.Update();
+		m_NetChecker.Update();
+
+		// process m_aPackets
+		CNetChunk Packet;
+		while(m_NetOp.Recv(&Packet))
+		{
+			// check if the server is banned
+			if(m_NetBan.IsBanned(&Packet.m_Address, 0, 0))
+				continue;
+
+			if(Packet.m_DataSize == sizeof(SERVERBROWSE_HEARTBEAT)+2 &&
+				mem_comp(Packet.m_pData, SERVERBROWSE_HEARTBEAT, sizeof(SERVERBROWSE_HEARTBEAT)) == 0)
+			{
+				NETADDR Alt;
+				unsigned char *d = (unsigned char *)Packet.m_pData;
+				Alt = Packet.m_Address;
+				Alt.port =
+					(d[sizeof(SERVERBROWSE_HEARTBEAT)]<<8) |
+					d[sizeof(SERVERBROWSE_HEARTBEAT)+1];
+
+				// add it
+				AddCheckserver(&Packet.m_Address, &Alt, SERVERTYPE_NORMAL);
+			}
+			else if(Packet.m_DataSize == sizeof(SERVERBROWSE_HEARTBEAT_LEGACY)+2 &&
+				mem_comp(Packet.m_pData, SERVERBROWSE_HEARTBEAT_LEGACY, sizeof(SERVERBROWSE_HEARTBEAT_LEGACY)) == 0)
+			{
+				NETADDR Alt;
+				unsigned char *d = (unsigned char *)Packet.m_pData;
+				Alt = Packet.m_Address;
+				Alt.port =
+					(d[sizeof(SERVERBROWSE_HEARTBEAT)]<<8) |
+					d[sizeof(SERVERBROWSE_HEARTBEAT)+1];
+
+				// add it
+				AddCheckserver(&Packet.m_Address, &Alt, SERVERTYPE_LEGACY);
+			}
+
+			else if(Packet.m_DataSize == sizeof(SERVERBROWSE_GETCOUNT) &&
+				mem_comp(Packet.m_pData, SERVERBROWSE_GETCOUNT, sizeof(SERVERBROWSE_GETCOUNT)) == 0)
+			{
+				dbg_msg("mastersrv", "count requested, responding with %d", m_NumServers);
+
+				CNetChunk p;
+				p.m_ClientID = -1;
+				p.m_Address = Packet.m_Address;
+				p.m_Flags = NETSENDFLAG_CONNLESS;
+				p.m_DataSize = sizeof(m_CountData);
+				p.m_pData = &m_CountData;
+				m_CountData.m_High = (m_NumServers>>8)&0xff;
+				m_CountData.m_Low = m_NumServers&0xff;
+				m_NetOp.Send(&p);
+			}
+			else if(Packet.m_DataSize == sizeof(SERVERBROWSE_GETCOUNT_LEGACY) &&
+				mem_comp(Packet.m_pData, SERVERBROWSE_GETCOUNT_LEGACY, sizeof(SERVERBROWSE_GETCOUNT_LEGACY)) == 0)
+			{
+				dbg_msg("mastersrv", "count requested, responding with %d", m_NumServers);
+
+				CNetChunk p;
+				p.m_ClientID = -1;
+				p.m_Address = Packet.m_Address;
+				p.m_Flags = NETSENDFLAG_CONNLESS;
+				p.m_DataSize = sizeof(m_CountData);
+				p.m_pData = &m_CountDataLegacy;
+				m_CountDataLegacy.m_High = (m_NumServers>>8)&0xff;
+				m_CountDataLegacy.m_Low = m_NumServers&0xff;
+				m_NetOp.Send(&p);
+			}
+			else if(Packet.m_DataSize == sizeof(SERVERBROWSE_GETLIST) &&
+				mem_comp(Packet.m_pData, SERVERBROWSE_GETLIST, sizeof(SERVERBROWSE_GETLIST)) == 0)
+			{
+				// someone requested the list
+				dbg_msg("mastersrv", "requested, responding with %d m_aServers", m_NumServers);
+
+				CNetChunk p;
+				p.m_ClientID = -1;
+				p.m_Address = Packet.m_Address;
+				p.m_Flags = NETSENDFLAG_CONNLESS;
+
+				for(int i = 0; i < m_NumPackets; i++)
+				{
+					p.m_DataSize = m_aPackets[i].m_Size;
+					p.m_pData = &m_aPackets[i].m_Data;
+					m_NetOp.Send(&p);
+				}
+			}
+			else if(Packet.m_DataSize == sizeof(SERVERBROWSE_GETLIST_LEGACY) &&
+				mem_comp(Packet.m_pData, SERVERBROWSE_GETLIST_LEGACY, sizeof(SERVERBROWSE_GETLIST_LEGACY)) == 0)
+			{
+				// someone requested the list
+				dbg_msg("mastersrv", "requested, responding with %d m_aServers", m_NumServers);
+
+				CNetChunk p;
+				p.m_ClientID = -1;
+				p.m_Address = Packet.m_Address;
+				p.m_Flags = NETSENDFLAG_CONNLESS;
+
+				for(int i = 0; i < m_NumPacketsLegacy; i++)
+				{
+					p.m_DataSize = m_aPacketsLegacy[i].m_Size;
+					p.m_pData = &m_aPacketsLegacy[i].m_Data;
+					m_NetOp.Send(&p);
+				}
+			}
+		}
+
+		// process m_aPackets
+		while(m_NetChecker.Recv(&Packet))
+		{
+			// check if the server is banned
+			if(m_NetBan.IsBanned(&Packet.m_Address, 0, 0))
+				continue;
+
+			if(Packet.m_DataSize == sizeof(SERVERBROWSE_FWRESPONSE) &&
+				mem_comp(Packet.m_pData, SERVERBROWSE_FWRESPONSE, sizeof(SERVERBROWSE_FWRESPONSE)) == 0)
+			{
+				Type = SERVERTYPE_INVALID;
+				// remove it from checking
+				for(int i = 0; i < m_NumCheckServers; i++)
+				{
+					if(net_addr_comp(&m_aCheckServers[i].m_Address, &Packet.m_Address) == 0 ||
+						net_addr_comp(&m_aCheckServers[i].m_AltAddress, &Packet.m_Address) == 0)
+					{
+						Type = m_aCheckServers[i].m_Type;
+						m_NumCheckServers--;
+						m_aCheckServers[i] = m_aCheckServers[m_NumCheckServers];
+						break;
+					}
+				}
+
+				// drops servers that were not in the CheckServers list
+				if(Type == SERVERTYPE_INVALID)
+					continue;
+
+				AddServer(&Packet.m_Address, Type);
+				SendOk(&Packet.m_Address);
+			}
+		}
+
+		if(time_get()-LastBanReload > time_freq()*300)
+		{
+			LastBanReload = time_get();
+
+			ReloadBans();
+		}
+
+		if(time_get()-LastBuild > time_freq()*5)
+		{
+			LastBuild = time_get();
+
+			PurgeServers();
+			UpdateServers();
+			BuildPackets();
+		}
+
+		// be nice to the CPU
+		thread_sleep(1);
+	}
+
+	return 0;
+}
diff --git a/src/mastersrv/mastersrv.h b/src/mastersrv/mastersrv.h
new file mode 100644
index 0000000..38e5ab2
--- /dev/null
+++ b/src/mastersrv/mastersrv.h
@@ -0,0 +1,52 @@
+/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
+/* If you are missing that file, acquire a complete release at teeworlds.com.                */
+#ifndef MASTERSRV_MASTERSRV_H
+#define MASTERSRV_MASTERSRV_H
+static const int MASTERSERVER_PORT = 8300;
+
+enum ServerType
+{
+	SERVERTYPE_INVALID = -1,
+	SERVERTYPE_NORMAL,
+	SERVERTYPE_LEGACY
+};
+
+struct CMastersrvAddr
+{
+	unsigned char m_aIp[16];
+	unsigned char m_aPort[2];
+};
+
+static const unsigned char SERVERBROWSE_HEARTBEAT[] = {255, 255, 255, 255, 'b', 'e', 'a', '2'};
+
+static const unsigned char SERVERBROWSE_GETLIST[] = {255, 255, 255, 255, 'r', 'e', 'q', '2'};
+static const unsigned char SERVERBROWSE_LIST[] = {255, 255, 255, 255, 'l', 'i', 's', '2'};
+
+static const unsigned char SERVERBROWSE_GETCOUNT[] = {255, 255, 255, 255, 'c', 'o', 'u', '2'};
+static const unsigned char SERVERBROWSE_COUNT[] = {255, 255, 255, 255, 's', 'i', 'z', '2'};
+
+static const unsigned char SERVERBROWSE_GETINFO[] = {255, 255, 255, 255, 'g', 'i', 'e', '3'};
+static const unsigned char SERVERBROWSE_INFO[] = {255, 255, 255, 255, 'i', 'n', 'f', '3'};
+
+static const unsigned char SERVERBROWSE_FWCHECK[] = {255, 255, 255, 255, 'f', 'w', '?', '?'};
+static const unsigned char SERVERBROWSE_FWRESPONSE[] = {255, 255, 255, 255, 'f', 'w', '!', '!'};
+static const unsigned char SERVERBROWSE_FWOK[] = {255, 255, 255, 255, 'f', 'w', 'o', 'k'};
+static const unsigned char SERVERBROWSE_FWERROR[] = {255, 255, 255, 255, 'f', 'w', 'e', 'r'};
+
+
+// packet headers for the 0.5 branch
+
+struct CMastersrvAddrLegacy
+{
+	unsigned char m_aIp[4];
+	unsigned char m_aPort[2];
+};
+
+static const unsigned char SERVERBROWSE_HEARTBEAT_LEGACY[] = {255, 255, 255, 255, 'b', 'e', 'a', 't'};
+
+static const unsigned char SERVERBROWSE_GETLIST_LEGACY[] = {255, 255, 255, 255, 'r', 'e', 'q', 't'};
+static const unsigned char SERVERBROWSE_LIST_LEGACY[] = {255, 255, 255, 255, 'l', 'i', 's', 't'};
+
+static const unsigned char SERVERBROWSE_GETCOUNT_LEGACY[] = {255, 255, 255, 255, 'c', 'o', 'u', 'n'};
+static const unsigned char SERVERBROWSE_COUNT_LEGACY[] = {255, 255, 255, 255, 's', 'i', 'z', 'e'};
+#endif
diff --git a/src/versionsrv/mapversions.h b/src/versionsrv/mapversions.h
new file mode 100644
index 0000000..1d62681
--- /dev/null
+++ b/src/versionsrv/mapversions.h
@@ -0,0 +1,22 @@
+/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
+/* If you are missing that file, acquire a complete release at teeworlds.com.                */
+#ifndef VERSIONSRV_MAPVERSIONS_H
+#define VERSIONSRV_MAPVERSIONS_H
+
+static CMapVersion s_aMapVersionList[] = {
+	{"ctf1", {0x06, 0xb5, 0xf1, 0x17}, {0x00, 0x00, 0x12, 0x38}},
+	{"ctf2", {0x27, 0xbc, 0x5e, 0xac}, {0x00, 0x00, 0x64, 0x1a}},
+	{"ctf3", {0xa3, 0x73, 0x9d, 0x41}, {0x00, 0x00, 0x17, 0x0f}},
+	{"ctf4", {0xbe, 0x7c, 0x4d, 0xb9}, {0x00, 0x00, 0x2e, 0xfe}},
+	{"ctf5", {0xd9, 0x21, 0x29, 0xa0}, {0x00, 0x00, 0x2f, 0x4c}},
+	{"ctf6", {0x28, 0xc8, 0x43, 0x51}, {0x00, 0x00, 0x69, 0x2f}},
+	{"ctf7", {0x1d, 0x35, 0x98, 0x72}, {0x00, 0x00, 0x15, 0x87}},
+	{"dm1", {0xf2, 0x15, 0x9e, 0x6e}, {0x00, 0x00, 0x16, 0xad}},
+	{"dm2", {0x71, 0x83, 0x98, 0x78}, {0x00, 0x00, 0x21, 0xdf}},
+	{"dm6", {0x47, 0x4d, 0xa2, 0x35}, {0x00, 0x00, 0x1e, 0x95}},
+	{"dm7", {0x42, 0x6d, 0xa1, 0x67}, {0x00, 0x00, 0x27, 0x2a}},
+	{"dm8", {0x2f, 0x74, 0xd9, 0x18}, {0x00, 0x00, 0xa1, 0xa1}},
+	{"dm9", {0x42, 0xd4, 0x77, 0x7e}, {0x00, 0x00, 0x20, 0x11}},
+};
+static const int s_NumMapVersionItems = sizeof(s_aMapVersionList)/sizeof(CMapVersion);
+#endif
diff --git a/src/versionsrv/versionsrv.cpp b/src/versionsrv/versionsrv.cpp
new file mode 100644
index 0000000..9d6e296
--- /dev/null
+++ b/src/versionsrv/versionsrv.cpp
@@ -0,0 +1,133 @@
+/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
+/* If you are missing that file, acquire a complete release at teeworlds.com.                */
+#include <base/system.h>
+
+#include <engine/shared/network.h>
+
+#include <game/version.h>
+
+#include "versionsrv.h"
+#include "mapversions.h"
+
+enum {
+	MAX_MAPS_PER_PACKET=48,
+	MAX_PACKETS=16,
+	MAX_MAPS=MAX_MAPS_PER_PACKET*MAX_PACKETS,
+};
+
+struct CPacketData
+{
+	int m_Size;
+	struct {
+		unsigned char m_aHeader[sizeof(VERSIONSRV_MAPLIST)];
+		CMapVersion m_aMaplist[MAX_MAPS_PER_PACKET];
+	} m_Data;
+};
+
+CPacketData m_aPackets[MAX_PACKETS];
+static int m_NumPackets = 0;
+
+static CNetClient g_NetOp; // main
+
+void BuildPackets()
+{
+	CMapVersion *pCurrent = &s_aMapVersionList[0];
+	int ServersLeft = s_NumMapVersionItems;
+	m_NumPackets = 0;
+	while(ServersLeft && m_NumPackets < MAX_PACKETS)
+	{
+		int Chunk = ServersLeft;
+		if(Chunk > MAX_MAPS_PER_PACKET)
+			Chunk = MAX_MAPS_PER_PACKET;
+		ServersLeft -= Chunk;
+
+		// copy header
+		mem_copy(m_aPackets[m_NumPackets].m_Data.m_aHeader, VERSIONSRV_MAPLIST, sizeof(VERSIONSRV_MAPLIST));
+
+		// copy map versions
+		for(int i = 0; i < Chunk; i++)
+		{
+			m_aPackets[m_NumPackets].m_Data.m_aMaplist[i] = *pCurrent;
+			pCurrent++;
+		}
+
+		m_aPackets[m_NumPackets].m_Size = sizeof(VERSIONSRV_MAPLIST) + sizeof(CMapVersion)*Chunk;
+
+		m_NumPackets++;
+	}
+}
+
+void SendVer(NETADDR *pAddr)
+{
+	CNetChunk p;
+	unsigned char aData[sizeof(VERSIONSRV_VERSION) + sizeof(GAME_RELEASE_VERSION)];
+
+	mem_copy(aData, VERSIONSRV_VERSION, sizeof(VERSIONSRV_VERSION));
+	mem_copy(aData + sizeof(VERSIONSRV_VERSION), GAME_RELEASE_VERSION, sizeof(GAME_RELEASE_VERSION));
+
+	p.m_ClientID = -1;
+	p.m_Address = *pAddr;
+	p.m_Flags = NETSENDFLAG_CONNLESS;
+	p.m_pData = aData;
+	p.m_DataSize = sizeof(aData);
+
+	g_NetOp.Send(&p);
+}
+
+int main(int argc, char **argv) // ignore_convention
+{
+	NETADDR BindAddr;
+
+	dbg_logger_stdout();
+	net_init();
+
+	mem_zero(&BindAddr, sizeof(BindAddr));
+	BindAddr.type = NETTYPE_ALL;
+	BindAddr.port = VERSIONSRV_PORT;
+	if(!g_NetOp.Open(BindAddr, 0))
+	{
+		dbg_msg("mastersrv", "couldn't start network");
+		return -1;
+	}
+
+	BuildPackets();
+
+	dbg_msg("versionsrv", "started");
+
+	while(1)
+	{
+		g_NetOp.Update();
+
+		// process packets
+		CNetChunk Packet;
+		while(g_NetOp.Recv(&Packet))
+		{
+			if(Packet.m_DataSize == sizeof(VERSIONSRV_GETVERSION) &&
+				mem_comp(Packet.m_pData, VERSIONSRV_GETVERSION, sizeof(VERSIONSRV_GETVERSION)) == 0)
+			{
+				SendVer(&Packet.m_Address);
+			}
+
+			if(Packet.m_DataSize == sizeof(VERSIONSRV_GETMAPLIST) &&
+				mem_comp(Packet.m_pData, VERSIONSRV_GETMAPLIST, sizeof(VERSIONSRV_GETMAPLIST)) == 0)
+			{
+				CNetChunk p;
+				p.m_ClientID = -1;
+				p.m_Address = Packet.m_Address;
+				p.m_Flags = NETSENDFLAG_CONNLESS;
+
+				for(int i = 0; i < m_NumPackets; i++)
+				{
+					p.m_DataSize = m_aPackets[i].m_Size;
+					p.m_pData = &m_aPackets[i].m_Data;
+					g_NetOp.Send(&p);
+				}
+			}
+		}
+
+		// be nice to the CPU
+		thread_sleep(1);
+	}
+
+	return 0;
+}
diff --git a/src/versionsrv/versionsrv.h b/src/versionsrv/versionsrv.h
new file mode 100644
index 0000000..46f6425
--- /dev/null
+++ b/src/versionsrv/versionsrv.h
@@ -0,0 +1,19 @@
+/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
+/* If you are missing that file, acquire a complete release at teeworlds.com.                */
+#ifndef VERSIONSRV_VERSIONSRV_H
+#define VERSIONSRV_VERSIONSRV_H
+static const int VERSIONSRV_PORT = 8302;
+
+struct CMapVersion
+{
+	char m_aName[8];
+	unsigned char m_aCrc[4];
+	unsigned char m_aSize[4];
+};
+
+static const unsigned char VERSIONSRV_GETVERSION[] = {255, 255, 255, 255, 'v', 'e', 'r', 'g'};
+static const unsigned char VERSIONSRV_VERSION[] = {255, 255, 255, 255, 'v', 'e', 'r', 's'};
+
+static const unsigned char VERSIONSRV_GETMAPLIST[] = {255, 255, 255, 255, 'v', 'm', 'l', 'g'};
+static const unsigned char VERSIONSRV_MAPLIST[] = {255, 255, 255, 255, 'v', 'm', 'l', 's'};
+#endif
-- 
2.1.0