From e04f3b36accccb590a2d51b4829256b9964ac3fd Mon Sep 17 00:00:00 2001
From: Emma Miler <emma.pi@protonmail.com>
Date: Mon, 19 Dec 2022 19:32:16 +0100
Subject: Restructuring (#365)

* Remove launcher proxy

* Restructuring

* More restructuring

* Fix include dirs

* Fix merge

* Remove clang thing

* Filters

* Oops
---
 NorthstarDLL/shared/playlist.cpp | 130 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 NorthstarDLL/shared/playlist.cpp

(limited to 'NorthstarDLL/shared/playlist.cpp')

diff --git a/NorthstarDLL/shared/playlist.cpp b/NorthstarDLL/shared/playlist.cpp
new file mode 100644
index 00000000..2fb856b3
--- /dev/null
+++ b/NorthstarDLL/shared/playlist.cpp
@@ -0,0 +1,130 @@
+#include "pch.h"
+#include "playlist.h"
+#include "core/convar/concommand.h"
+#include "core/convar/convar.h"
+#include "squirrel/squirrel.h"
+#include "engine/hoststate.h"
+#include "server/serverpresence.h"
+
+AUTOHOOK_INIT()
+
+// use the R2 namespace for game funcs
+namespace R2
+{
+	const char* (*GetCurrentPlaylistName)();
+	void (*SetCurrentPlaylist)(const char* pPlaylistName);
+	void (*SetPlaylistVarOverride)(const char* pVarName, const char* pValue);
+	const char* (*GetCurrentPlaylistVar)(const char* pVarName, bool bUseOverrides);
+} // namespace R2
+
+ConVar* Cvar_ns_use_clc_SetPlaylistVarOverride;
+
+// clang-format off
+AUTOHOOK(clc_SetPlaylistVarOverride__Process, engine.dll + 0x222180,
+char, __fastcall, (void* a1, void* a2))
+// clang-format on
+{
+	// the private_match playlist on mp_lobby is the only situation where there should be any legitimate sending of this netmessage
+	if (!Cvar_ns_use_clc_SetPlaylistVarOverride->GetBool() || strcmp(R2::GetCurrentPlaylistName(), "private_match") ||
+		strcmp(R2::g_pHostState->m_levelName, "mp_lobby"))
+		return 1;
+
+	return clc_SetPlaylistVarOverride__Process(a1, a2);
+}
+
+// clang-format off
+AUTOHOOK(SetCurrentPlaylist, engine.dll + 0x18EB20,
+bool, __fastcall, (const char* pPlaylistName))
+// clang-format on
+{
+	bool bSuccess = SetCurrentPlaylist(pPlaylistName);
+
+	if (bSuccess)
+	{
+		spdlog::info("Set playlist to {}", R2::GetCurrentPlaylistName());
+		g_pServerPresence->SetPlaylist(R2::GetCurrentPlaylistName());
+	}
+
+	return bSuccess;
+}
+
+// clang-format off
+AUTOHOOK(SetPlaylistVarOverride, engine.dll + 0x18ED00,
+void, __fastcall, (const char* pVarName, const char* pValue))
+// clang-format on
+{
+	if (strlen(pValue) >= 64)
+		return;
+
+	SetPlaylistVarOverride(pVarName, pValue);
+}
+
+// clang-format off
+AUTOHOOK(GetCurrentPlaylistVar, engine.dll + 0x18C680,
+const char*, __fastcall, (const char* pVarName, bool bUseOverrides))
+// clang-format on
+{
+	if (!bUseOverrides && !strcmp(pVarName, "max_players"))
+		bUseOverrides = true;
+
+	return GetCurrentPlaylistVar(pVarName, bUseOverrides);
+}
+
+// clang-format off
+AUTOHOOK(GetCurrentGamemodeMaxPlayers, engine.dll + 0x18C430,
+int, __fastcall, ())
+// clang-format on
+{
+	const char* pMaxPlayers = R2::GetCurrentPlaylistVar("max_players", 0);
+	if (!pMaxPlayers)
+		return GetCurrentGamemodeMaxPlayers();
+
+	int iMaxPlayers = atoi(pMaxPlayers);
+	return iMaxPlayers;
+}
+
+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));
+}
+
+ON_DLL_LOAD_RELIESON("engine.dll", PlaylistHooks, (ConCommand, ConVar), (CModule module))
+{
+	AUTOHOOK_DISPATCH()
+
+	R2::GetCurrentPlaylistName = module.Offset(0x18C640).As<const char* (*)()>();
+	R2::SetCurrentPlaylist = module.Offset(0x18EB20).As<void (*)(const char*)>();
+	R2::SetPlaylistVarOverride = module.Offset(0x18ED00).As<void (*)(const char*, const char*)>();
+	R2::GetCurrentPlaylistVar = module.Offset(0x18C680).As<const char* (*)(const char*, bool)>();
+
+	// 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");
+
+	// 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
+	module.Offset(0x18ED8D).Patch("C3");
+
+	// patch to allow setplaylistvaroverride to be called before map init on dedicated and private match launched through the game
+	module.Offset(0x18ED17).NOP(6);
+}
-- 
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