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https://github.com/FWGS/xash3d-fwgs.git
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130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*
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cl_steam.c - steam(tm) broker implementation
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Copyright (C) 2026 Xash3D FWGS contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include <inttypes.h>
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#include "common.h"
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#include "client.h"
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// What is a broker?
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// From Wikipedia, the free encyclopedia:
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// "The broker pattern is an architecture pattern that involves the use of an
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// intermediary software entity, called a "broker", to facilitate communication
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// between two or more software components. The broker acts as a "middleman"
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// between the components, allowing them to communicate without being aware of
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// each other's existence.
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//
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// Due to proprietary nature of Steamworks SDK, it cannot be run on same amount
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// of platforms supported by Xash3D FWGS, neither we can link directly due to
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// GNU GPLv3 license. However, here comes the broker, by running it (in trusted
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// network, preferrably) on a machine that has Steam client installed, the
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// engine can communicate with it, acquiring needed information to log-in into
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// Steam protected multiplayer servers.
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static CVAR_DEFINE_AUTO( cl_steam_broker_addr, "127.0.0.1:27420", FCVAR_ARCHIVE, "address of steam broker instance" );
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static struct
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{
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netadr_t adr;
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int challenge;
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netadr_t serveradr;
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} broker;
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qboolean SteamBroker_InitiateGameConnection( netadr_t serveradr, int challenge )
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{
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if( NET_NetadrType( &broker.adr ) == NA_UNDEFINED )
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{
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if( !NET_StringToAdr( cl_steam_broker_addr.string, &broker.adr ))
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{
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Con_Printf( "%s: NET_StringToAdr( %s ) failed\n", __func__, cl_steam_broker_addr.string );
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return false;
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}
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}
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// only ipv4 supported
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if( NET_NetadrType( &serveradr ) != NA_IP )
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return false;
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broker.challenge = challenge;
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broker.serveradr = serveradr;
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// sb_connect <ip:port> <server's steam id> <secure> <challenge>
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// the message calls
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char buf[512];
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int len = Q_snprintf( buf, sizeof( buf ), "sb_connect %s %"PRIu64" %s %d", NET_AdrToString( serveradr ), cls.server_steamid, cls.vac2_secure ? "true" : "false", broker.challenge );
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NET_SendPacket( NS_CLIENT, len, buf, broker.adr );
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return true;
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}
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void SteamBroker_TerminateGameConnection( void )
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{
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if( NET_NetadrType( &broker.adr ) == NA_UNDEFINED )
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return;
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if( NET_NetadrType( &cls.serveradr ) != NA_IP )
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return;
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if( cls.legacymode != PROTO_GOLDSRC )
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return;
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// sb_terminate <ip:port> <challenge>quitйгше
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char buf[512];
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int len = Q_snprintf( buf, sizeof( buf ), "sb_terminate %s %d", NET_AdrToString( cls.serveradr ), broker.challenge );
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NET_SendPacket( NS_CLIENT, len, buf, broker.adr );
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}
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void SteamBroker_HandlePacket( netadr_t from, sizebuf_t *msg )
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{
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// message format
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// sb_connect\n<4 byte challenge><8 byte steamid><unsigned 4 byte len><len bytes ticket>
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int challenge;
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uint32_t len;
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uint8_t ticket[2048]; // 2048 bytes according to SDK docs
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if( !NET_CompareAdr( from, broker.adr ))
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return;
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challenge = MSG_ReadLong( msg );
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if( broker.challenge != challenge ) // TODO: print error
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return;
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MSG_ReadBytes( msg, cls.steamid, sizeof( cls.steamid ));
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len = MSG_ReadDword( msg );
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if( len > sizeof( ticket )) // TODO: print error, proceed without ticket?
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return;
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MSG_ReadBytes( msg, ticket, len );
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Con_Printf( "%s: SteamID: %"PRIu64", ticket: [%d, %d, %d, %d...]\n", __func__, *(uint64_t *)cls.steamid, ticket[0], ticket[1], ticket[2], ticket[3] );
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CL_SendGoldSrcConnectPacket( broker.serveradr, challenge, ticket, len );
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cls.broker_wait = false;
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}
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void SteamBroker_Init( void )
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{
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Cvar_RegisterVariable( &cl_steam_broker_addr );
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NET_NetadrSetType( &broker.adr, NA_UNDEFINED );
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}
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void SteamBroker_Shutdown( void )
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{
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}
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