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#include "pch.h"
#include "playlist.h"
#include "NSMem.h"
#include "hooks.h"
#include "concommand.h"
#include "convar.h"
#include "gameutils.h"
#include "hookutils.h"
#include "squirrel.h"
// use the R2 namespace for game funcs
namespace R2
{
GetCurrentPlaylistNameType GetCurrentPlaylistName;
SetCurrentPlaylistType SetCurrentPlaylist;
SetPlaylistVarOverrideType SetPlaylistVarOverride;
GetCurrentPlaylistVarType GetCurrentPlaylistVar;
} // namespace R2
void ConCommand_playlist(const CCommand& args)
{
if (args.ArgC() < 2)
return;
R2::SetCurrentPlaylist(args.Arg(1));
}
void ConCommand_setplaylistvaroverride(const CCommand& args)
{
if (args.ArgC() < 3)
return;
for (int i = 1; i < args.ArgC(); i += 2)
R2::SetPlaylistVarOverride(args.Arg(i), args.Arg(i + 1));
}
ConVar* Cvar_ns_use_clc_SetPlaylistVarOverride;
typedef char (*Onclc_SetPlaylistVarOverrideType)(void* a1, void* a2);
Onclc_SetPlaylistVarOverrideType Onclc_SetPlaylistVarOverride;
char Onclc_SetPlaylistVarOverrideHook(void* a1, void* a2)
{
// the private_match playlist is the only situation where there should be any legitimate sending of this netmessage
// todo: check mp_lobby here too
if (!Cvar_ns_use_clc_SetPlaylistVarOverride->GetBool() || strcmp(R2::GetCurrentPlaylistName(), "private_match"))
return 1;
return Onclc_SetPlaylistVarOverride(a1, a2);
}
void SetPlaylistVarOverrideHook(const char* varName, const char* value)
{
if (strlen(value) >= 64)
return;
R2::SetPlaylistVarOverride(varName, value);
}
const char* GetCurrentPlaylistVarHook(const char* varName, bool useOverrides)
{
if (!useOverrides && !strcmp(varName, "max_players"))
useOverrides = true;
return R2::GetCurrentPlaylistVar(varName, useOverrides);
}
typedef int (*GetCurrentGamemodeMaxPlayersType)();
GetCurrentGamemodeMaxPlayersType GetCurrentGamemodeMaxPlayers;
int GetCurrentGamemodeMaxPlayersHook()
{
char* maxPlayersStr = R2::GetCurrentPlaylistVar("max_players", 0);
if (!maxPlayersStr)
return GetCurrentGamemodeMaxPlayers();
int maxPlayers = atoi(maxPlayersStr);
return maxPlayers;
}
ON_DLL_LOAD_RELIESON("engine.dll", PlaylistHooks, ConCommand, [](HMODULE baseAddress)
{
// playlist is the name of the command on respawn servers, but we already use setplaylist so can't get rid of it
RegisterConCommand("playlist", ConCommand_playlist, "Sets the current playlist", FCVAR_NONE);
RegisterConCommand("setplaylist", ConCommand_playlist, "Sets the current playlist", FCVAR_NONE);
RegisterConCommand("setplaylistvaroverrides", ConCommand_setplaylistvaroverride, "sets a playlist var override", FCVAR_NONE);
// note: clc_SetPlaylistVarOverride is pretty insecure, since it allows for entirely arbitrary playlist var overrides to be sent to the
// server, this is somewhat restricted on custom servers to prevent it being done outside of private matches, but ideally it should be
// disabled altogether, since the custom menus won't use it anyway this should only really be accepted if you want vanilla client
// compatibility
Cvar_ns_use_clc_SetPlaylistVarOverride = new ConVar(
"ns_use_clc_SetPlaylistVarOverride", "0", FCVAR_GAMEDLL, "Whether the server should accept clc_SetPlaylistVarOverride messages");
R2::GetCurrentPlaylistName = (R2::GetCurrentPlaylistNameType)((char*)baseAddress + 0x18C640);
R2::SetCurrentPlaylist = (R2::SetCurrentPlaylistType)((char*)baseAddress + 0x18EB20);
R2::SetPlaylistVarOverride = (R2::SetPlaylistVarOverrideType)((char*)baseAddress + 0x18ED00);
R2::GetCurrentPlaylistVar = (R2::GetCurrentPlaylistVarType)((char*)baseAddress + 0x18C680);
HookEnabler hook;
ENABLER_CREATEHOOK(
hook, (char*)baseAddress + 0x222180, &Onclc_SetPlaylistVarOverrideHook, reinterpret_cast<LPVOID*>(&Onclc_SetPlaylistVarOverride));
ENABLER_CREATEHOOK(
hook, (char*)baseAddress + 0x18ED00, &SetPlaylistVarOverrideHook, reinterpret_cast<LPVOID*>(&R2::SetPlaylistVarOverride));
ENABLER_CREATEHOOK(
hook, (char*)baseAddress + 0x18C680, &GetCurrentPlaylistVarHook, reinterpret_cast<LPVOID*>(&R2::GetCurrentPlaylistVar));
ENABLER_CREATEHOOK(
hook,
(char*)baseAddress + 0x18C430,
&GetCurrentGamemodeMaxPlayersHook,
reinterpret_cast<LPVOID*>(&GetCurrentGamemodeMaxPlayers));
uintptr_t ba = (uintptr_t)baseAddress;
// patch to prevent clc_SetPlaylistVarOverride from being able to crash servers if we reach max overrides due to a call to Error (why is
// this possible respawn, wtf) todo: add a warning for this
NSMem::BytePatch(ba + 0x18ED8D, "C3");
// patch to allow setplaylistvaroverride to be called before map init on dedicated and private match launched through the game
NSMem::NOP(ba + 0x18ED17, 6);
})
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