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Safe Memory Patching

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Using `baseserver.h` (https://github.com/L4D-Community/Left4Downtown2/blob/master/extension/l4d2sdk/baseserver.h) instead of hardcoded offsets. Thanks @A1mDev
This commit is contained in:
Accelerator
2025-07-12 17:08:37 +03:00
parent e235106c86
commit 11ab6e1e54
7 changed files with 299 additions and 71 deletions
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l4dtoolz_mm.cpp
+20 -19
View File
@@ -1,5 +1,6 @@
#include "l4dtoolz_mm.h"
#include "game_offsets.h"
#include "baseserver.h"
#include "memutils.h"
#include "icommandline.h"
#include "server_class.h"
@@ -14,14 +15,14 @@ IMatchFramework* g_pMatchFramework = NULL;
ICvar* g_pCVar = NULL;
IServer* g_pGameIServer = NULL;
void* g_pGameRules = nullptr;
int m_numGameSlots = -1;
int g_nGameSlots = -1;
SH_DECL_HOOK1_void(IServerGameDLL, ApplyGameSettings, SH_NOATTRIB, 0, KeyValues*);
SH_DECL_HOOK0(IMatchTitle, GetTotalNumPlayersSupported, SH_NOATTRIB, 0, int);
SH_DECL_HOOK6(IServerGameDLL, LevelInit, SH_NOATTRIB, 0, bool, char const *, char const *, char const *, char const *, bool, bool);
SH_DECL_HOOK0_void(IServerGameDLL, LevelShutdown, SH_NOATTRIB, 0);
SH_DECL_MANUALHOOK0(CTerrorGameRules_GetMaxHumanPlayers, maxhuman_idx, 0, 0, int);
SH_DECL_MANUALHOOK2_void(CBaseServer_ReplyReservationRequest, reservation_idx, 0, 0, netadr_s&, CBitRead&);
SH_DECL_HOOK2_void(IServer, ReplyReservationRequest, 0, 0, netadr_s&, bf_read&);
ConVar sv_maxplayers("sv_maxplayers", "-1", FCVAR_SPONLY|FCVAR_NOTIFY, "Max Human Players", true, -1, true, 32, l4dtoolz::OnChangeMaxplayers);
ConVar sv_force_unreserved("sv_force_unreserved", "0", FCVAR_SPONLY|FCVAR_NOTIFY, "Disallow lobby reservation cookie", true, 0, true, 1, l4dtoolz::OnChangeUnreserved);
@@ -36,10 +37,10 @@ void l4dtoolz::OnChangeMaxplayers ( IConVar *var, const char *pOldValue, float f
}
if(new_value != old_value) {
if(new_value >= 0) {
m_numGameSlots = new_value;
*(int*)(((uint**)g_pGameIServer)+slots_offs) = m_numGameSlots;
g_nGameSlots = new_value;
g_pGameIServer->m_numGameSlots = g_nGameSlots;
} else {
m_numGameSlots = -1;
g_nGameSlots = -1;
}
}
}
@@ -64,18 +65,18 @@ void Hook_ApplyGameSettings(KeyValues *pKV)
if (!pKV) {
return;
}
m_numGameSlots = sv_maxplayers.GetInt();
if (m_numGameSlots == -1) {
g_nGameSlots = sv_maxplayers.GetInt();
if (g_nGameSlots == -1) {
return;
}
pKV->SetInt("members/numSlots", m_numGameSlots);
pKV->SetInt("members/numSlots", g_nGameSlots);
}
void Hook_ReplyReservationRequest(netadr_s& adr, CBitRead& inmsg)
void Hook_ReplyReservationRequest(netadr_s& adr, bf_read& inmsg)
{
if (sv_force_unreserved.GetInt()) {
if (g_pGameIServer != NULL) {
if (*(uint64_t*)(((char*)g_pGameIServer)+reserved_offs) != 0)
if (g_pGameIServer->m_nReservationCookie != 0)
RETURN_META(MRES_IGNORED);
}
RETURN_META(MRES_SUPERCEDE);
@@ -85,10 +86,10 @@ void Hook_ReplyReservationRequest(netadr_s& adr, CBitRead& inmsg)
int Hook_GetMaxHumanPlayers()
{
if (m_numGameSlots > 0) {
RETURN_META_VALUE(MRES_SUPERCEDE, m_numGameSlots);
if (g_nGameSlots > 0) {
RETURN_META_VALUE(MRES_SUPERCEDE, g_nGameSlots);
}
RETURN_META_VALUE(MRES_IGNORED, m_numGameSlots);
RETURN_META_VALUE(MRES_IGNORED, g_nGameSlots);
}
PLUGIN_EXPOSE(l4dtoolz, g_l4dtoolz);
@@ -116,14 +117,14 @@ bool l4dtoolz::Load(PluginId id, ISmmAPI *ismm, char *error, size_t maxlen, bool
g_pGameIServer = (IServer *)g_MemUtils.ResolveSymbol(handle, "sv");
dlclose(handle);
#endif
int* m_nMaxClientsLimit = (int*)(((uint**)g_pGameIServer)+maxplayers_offs);
if (*m_nMaxClientsLimit != 0x12) {
int* m_nMaxClientsLimit = reinterpret_cast<int*>(reinterpret_cast<uintptr_t>(g_pGameIServer)+maxplayers_offs);
if (*m_nMaxClientsLimit != 18) {
Warning("Couldn't patch maxplayers\n");
if (!late) {
g_pGameIServer = NULL;
}
} else {
*m_nMaxClientsLimit = 0x20;
*m_nMaxClientsLimit = 32;
const char *pszCmdLineMax;
if(CommandLine()->CheckParm("-maxplayers", &pszCmdLineMax) || CommandLine()->CheckParm("+maxplayers", &pszCmdLineMax)) {
char command[32];
@@ -142,7 +143,7 @@ bool l4dtoolz::Load(PluginId id, ISmmAPI *ismm, char *error, size_t maxlen, bool
SH_ADD_HOOK_MEMFUNC(IServerGameDLL, LevelShutdown, gamedll, this, &l4dtoolz::LevelShutdown, false);
if (g_pGameIServer) {
SH_ADD_MANUALHOOK(CBaseServer_ReplyReservationRequest, g_pGameIServer, SH_STATIC(Hook_ReplyReservationRequest), false);
SH_ADD_HOOK(IServer, ReplyReservationRequest, g_pGameIServer, SH_STATIC(Hook_ReplyReservationRequest), false);
} else {
Warning("g_pGameIServer pointer is not available\n");
}
@@ -160,7 +161,7 @@ bool l4dtoolz::Unload(char *error, size_t maxlen)
SH_REMOVE_HOOK_MEMFUNC(IServerGameDLL, LevelShutdown, gamedll, this, &l4dtoolz::LevelShutdown, false);
if (g_pGameIServer) {
SH_REMOVE_MANUALHOOK(CBaseServer_ReplyReservationRequest, g_pGameIServer, SH_STATIC(Hook_ReplyReservationRequest), false);
SH_REMOVE_HOOK(IServer, ReplyReservationRequest, g_pGameIServer, SH_STATIC(Hook_ReplyReservationRequest), false);
}
LevelShutdown();
@@ -241,7 +242,7 @@ const char *l4dtoolz::GetLicense()
const char *l4dtoolz::GetVersion()
{
return "2.0.1";
return "2.0.2";
}
const char *l4dtoolz::GetDate()