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Dvar cheats

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Co-Authored-By: Skull Merlin <86374920+skkuull@users.noreply.github.com>
This commit is contained in:
Federico Cecchetto 2022-05-19 22:08:14 +02:00
parent 605f04fa8d
commit 139f3c44a0
2 changed files with 41 additions and 95 deletions
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132
src/client/component/dvar_cheats.cpp
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@ -83,92 +83,45 @@ namespace dvar_cheats
return true;
}
const auto dvar_flag_checks_stub = utils::hook::assemble([](utils::hook::assembler& a)
void* get_dvar_flag_checks_stub()
{
const auto can_set_value = a.newLabel();
const auto zero_source = a.newLabel();
a.pushad64();
a.mov(r8, rdi);
a.mov(edx, esi);
a.mov(rcx, rbx);
a.call_aligned(apply_sv_cheats); //check if we are setting sv_cheats
a.popad64();
a.cmp(esi, 0);
a.jz(zero_source); //if the SetSource is 0 (INTERNAL) ignore flag checks
a.pushad64();
a.mov(edx, esi); //source
a.mov(rcx, rbx); //dvar
a.call_aligned(dvar_flag_checks); //protect read/write/cheat/replicated dvars
a.cmp(al, 1);
a.jz(can_set_value);
// if we get here, we are non-zero source and CANNOT set values
a.popad64(); // if I do this before the jz it won't work. for some reason the popad64 is affecting the ZR flag
a.jmp(0x1404FDCAB);
// if we get here, we are non-zero source and CAN set values
a.bind(can_set_value);
a.popad64(); // if I do this before the jz it won't work. for some reason the popad64 is affecting the ZR flag
a.cmp(esi, 1);
a.jmp(0x1404FDA22);
// if we get here, we are zero source and ignore flags
a.bind(zero_source);
a.jmp(0x1404FDA62);
});
void cg_set_client_dvar_from_server(const int local_client_num, void* cg, const char* dvar_id, const char* value)
{
const auto* dvar = game::Dvar_FindVar(dvar_id);
if (dvar)
return utils::hook::assemble([](utils::hook::assembler& a)
{
// If we send as string, it can't be set with source SERVERCMD because the game only allows that source on real server cmd dvars.
// Just use external instead as if it was being set by the console
game::Dvar_SetFromStringByNameFromSource(dvar_id, value, game::DvarSetSource::DVAR_SOURCE_EXTERNAL);
}
else
{
// Not a dvar name, assume it is an id and the game will handle normally
game::CG_SetClientDvarFromServer(local_client_num, cg, dvar_id, value);
}
const auto can_set_value = a.newLabel();
const auto zero_source = a.newLabel();
a.pushad64();
a.mov(r8, rdi);
a.mov(edx, esi);
a.mov(rcx, rbx);
a.call_aligned(apply_sv_cheats); // check if we are setting sv_cheats
a.popad64();
a.cmp(esi, 0);
a.jz(zero_source); // if the SetSource is 0 (INTERNAL) ignore flag checks
a.pushad64();
a.mov(edx, esi); // source
a.mov(rcx, rbx); // dvar
a.call_aligned(dvar_flag_checks); // protect read/write/cheat/replicated dvars
a.cmp(al, 1);
a.jz(can_set_value);
// if we get here, we are non-zero source and CANNOT set values
a.popad64(); // if I do this before the jz it won't work. for some reason the popad64 is affecting the ZR flag
a.jmp(0x18655C_b);
// if we get here, we are non-zero source and CAN set values
a.bind(can_set_value);
a.popad64(); // if I do this before the jz it won't work. for some reason the popad64 is affecting the ZR flag
a.cmp(esi, 1);
a.jmp(0x1861EE_b);
// if we get here, we are zero source and ignore flags
a.bind(zero_source);
a.jmp(0x18628F_b);
});
}
void set_client_dvar_by_string(const int entity_num, const char* value)
{
const auto* dvar = game::Scr_GetString(0); // grab the original dvar again since it's never stored on stack
const auto* command = utils::string::va("q %s \"%s\"", dvar, value);
game::SV_GameSendServerCommand(entity_num, game::SV_CMD_RELIABLE, command);
}
const auto player_cmd_set_client_dvar = utils::hook::assemble([](utils::hook::assembler& a)
{
const auto set_by_string = a.newLabel();
a.pushad64();
// check if we didn't find a network dvar index
a.mov(ecx, dword_ptr(rsp, 0x8C8));
a.cmp(ecx, 0);
a.je(set_by_string);
// we found an index, handle normally
a.popad64();
a.mov(r8d, ptr(rsp, 0x848));
a.lea(r9, ptr(rsp, 0x30));
a.jmp(0x1402E2E57);
// no index, let's send the dvar as a string
a.bind(set_by_string);
a.movzx(ecx, word_ptr(rsp, 0x8C0)); //entity_num
a.lea(rdx, ptr(rsp, 0xB0)); //value
a.call_aligned(set_client_dvar_by_string);
a.popad64();
a.jmp(0x1402E2E7D);
});
class component final : public component_interface
{
public:
@ -179,23 +132,16 @@ namespace dvar_cheats
return;
}
utils::hook::nop(0x1404FDA0D, 4); // let our stub handle zero-source sets
utils::hook::jump(0x1404FDA14, dvar_flag_checks_stub, true); // check extra dvar flags when setting values
// utils::hook::nop(0x14032AACC, 5); // remove error in PlayerCmd_SetClientDvar if setting a non-network dvar
// utils::hook::set<uint8_t>(0x14032AA9B, 0xEB);
// don't check flags on the dvars, send any existing dvar instead
// utils::hook::jump(0x14032AB14, player_cmd_set_client_dvar, true); // send non-network dvars as string
// utils::hook::call(0x1401BB782, cg_set_client_dvar_from_server);
// check for dvars being sent as string before parsing ids
utils::hook::nop(0x1861D4_b, 8); // let our stub handle zero-source sets
utils::hook::jump(0x1861DF_b, get_dvar_flag_checks_stub(), true); // check extra dvar flags when setting values
scheduler::once([]()
{
dvars::register_bool("sv_cheats", false, game::DvarFlags::DVAR_FLAG_REPLICATED,
"Allow cheat commands and dvars on this server");
"Allow cheat commands and dvars on this server");
}, scheduler::pipeline::main);
}
};
}
//REGISTER_COMPONENT(dvar_cheats::component)
REGISTER_COMPONENT(dvar_cheats::component)

4
src/client/game/symbols.hpp
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@ -232,8 +232,8 @@ namespace game
WEAK symbol<GfxDrawMethod_s> gfxDrawMethod{0x0, 0x0};
WEAK symbol<int> dvarCount{0x0, 0x0};
WEAK symbol<dvar_t> dvarPool{0x0, 0x0};
WEAK symbol<int> dvarCount{0x0, 0x2999C34};
WEAK symbol<dvar_t> dvarPool{0x0, 0x344DF20};
WEAK symbol<void*> DB_XAssetPool{0x0, 0x0};
WEAK symbol<const char*> g_assetNames{0x0, 0x0};