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Cstrike: Convert code to use CDetour and MemoryUtils.

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This commit is contained in:
Arkshine
2014-05-28 23:59:34 +02:00
parent d7b3b47aa4
commit e4ff6853dd
3 changed files with 55 additions and 191 deletions
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233
dlls/cstrike/cstrike/CstrikeHacks.cpp
View File

@@ -1,97 +1,66 @@
#include <assert.h>
#include <stdlib.h>
#include "CstrikeDatas.h"
#if defined(__linux__) || defined(__APPLE__)
#include <sys/mman.h>
#define PAGE_EXECUTE_READWRITE PROT_READ|PROT_WRITE|PROT_EXEC
#if defined(__linux)
#include <malloc.h>
#endif
#endif
#include <MemoryUtils.h>
#include "CDetour/detours.h"
#if defined(__APPLE__)
#include <mach-o/nlist.h>
#include <mach-o/nlist.h>
#endif
/* Utils */
unsigned char *UTIL_CodeAlloc(size_t size);
void UTIL_CodeFree(unsigned char *addr);
void UTIL_MemProtect(void *addr, int length, int prot);
bool UTIL_GetLibraryOfAddress(void *memInBase, char *buffer, size_t maxlength, uintptr_t *base);
/* Detours */
void CtrlDetour_ClientCommand(bool set);
int Detour_ClientCommand(edict_t *pEdict);
int g_CSCliCmdFwd = -1;
int *g_UseBotArgs = NULL;
const char **g_BotArgs = NULL;
CDetour *g_ClientCommandDetour = NULL;
/* Called on startup */
void InitializeHacks()
{
CtrlDetour_ClientCommand(true);
}
void OnPluginsLoaded()
{
g_CSCliCmdFwd = MF_RegisterForward("CS_InternalCommand", ET_STOP, FP_CELL, FP_STRING, FP_DONE);
}
void ShutdownHacks()
{
CtrlDetour_ClientCommand(false);
}
DETOUR_DECL_STATIC1(C_ClientCommand, void, edict_t*, pEdict)
{
if (*g_UseBotArgs)
{
int client = ENTINDEX(pEdict);
const char *args = *g_BotArgs;
if (MF_ExecuteForward(g_CSCliCmdFwd, static_cast<cell>(client), args) > 0)
{
return;
}
}
DETOUR_STATIC_CALL(C_ClientCommand)(pEdict);
}
void CtrlDetour_ClientCommand(bool set)
{
#if defined AMD64
#error UNSUPPORTED
#error UNSUPPORTED
#endif
static unsigned char DetourOps[] =
{
0x50, /* push eax ; just for safety */
0xff, 0x74, 0x24, 0x08, /* push [esp+0x8] ; push the edict pointer */
0xe8, 0x00, 0x00, 0x00, 0x00, /* call <gate> ; call our function */
0x83, 0xc4, 0x08, /* add esp, 8 ; correct stack */
0x85, 0xc0, /* test eax, eax ; do != 0 test */
0x74, 0x01, /* je <cont> ; if == 0, jump to where old func is saved */
0xc3 /* ret ; return otherwise */
};
static unsigned char DetourJmp = '\xE9';
const unsigned int DetourBytes = 18;
const unsigned int DetourCallPos = 6;
const unsigned int DetourJmpPos = DetourBytes + CS_DETOURCOPYBYTES_CLIENTCOMMAND;
const unsigned int DetourJmpBytes = 5;
static unsigned char *FullDetour = NULL;
void *target = (void *)MDLL_ClientCommand;
unsigned char *paddr;
if (!g_UseBotArgs)
{
#if defined(__linux__) || defined(__APPLE__)
/* Find the DLL */
#if defined(__linux__)
g_UseBotArgs = (int *)g_MemUtils.ResolveSymbol(target, "UseBotArgs");
g_BotArgs = (const char **)g_MemUtils.ResolveSymbol(target, "BotArgs");
#elif defined(__APPLE__)
/* Using dlsym on OS X won't work because the symbols are hidden */
char dll[256];
uintptr_t base;
if (!UTIL_GetLibraryOfAddress(target, dll, sizeof(dll), &base))
{
return;
}
#if defined(__linux__)
void *handle = dlopen(dll, RTLD_NOW);
if (!handle)
{
return;
}
g_UseBotArgs = (int *)dlsym(handle, "UseBotArgs");
g_BotArgs = (const char **)dlsym(handle, "BotArgs");
dlclose(handle);
#elif defined(__APPLE__)
/* Using dlsym on OS X won't work because the symbols are hidden */
g_MemUtils.GetLibraryOfAddress(target, dll, sizeof(dll), &base);
struct nlist symbols[3];
memset(symbols, 0, sizeof(symbols));
symbols[0].n_un.n_name = (char *)"_UseBotArgs";
@@ -102,136 +71,26 @@ void CtrlDetour_ClientCommand(bool set)
}
g_UseBotArgs = (int *)(base + symbols[0].n_value);
g_BotArgs = (const char **)(base + symbols[1].n_value);
#endif
#else /* Windows */
/* Find the bot args addresses */
paddr = (unsigned char *)target + CS_CLICMD_OFFS_USEBOTARGS;
g_UseBotArgs = *(int **)paddr;
paddr = (unsigned char *)target + CS_CLICMD_OFFS_BOTARGS;
g_BotArgs = (const char **)*(const char **)paddr;
#elif defined(WIN32)
g_UseBotArgs = *(int **)((unsigned char *)target + CS_CLICMD_OFFS_USEBOTARGS);
g_BotArgs = (const char **)*(const char **)((unsigned char *)target + CS_CLICMD_OFFS_BOTARGS);
#endif
}
if (set)
{
assert(FullDetour == NULL);
FullDetour = UTIL_CodeAlloc(DetourBytes + CS_DETOURCOPYBYTES_CLIENTCOMMAND + DetourJmpBytes);
/* Copy the main trampoline function */
memcpy(FullDetour, DetourOps, DetourBytes);
/* Copy our detour call into the trampoline */
paddr = &FullDetour[DetourCallPos];
*(unsigned long *)paddr = (unsigned long)Detour_ClientCommand - (unsigned long)(paddr + 4);
/* Copy original bytes onto the end of the function */
memcpy(&FullDetour[DetourBytes], target, CS_DETOURCOPYBYTES_CLIENTCOMMAND);
/* Patch and copy the final jmp */
paddr = &FullDetour[DetourJmpPos];
*paddr++ = DetourJmp;
*(unsigned long *)paddr = ((unsigned long)target + CS_DETOURCOPYBYTES_CLIENTCOMMAND)
- (unsigned long)(paddr + 4);
/* Now overwrite the target function with our trampoline */
UTIL_MemProtect(target, CS_DETOURCOPYBYTES_CLIENTCOMMAND + 10, PAGE_EXECUTE_READWRITE);
paddr = (unsigned char *)target;
*paddr++ = DetourJmp;
*(unsigned long *)paddr = (unsigned long)FullDetour - (unsigned long)(paddr + 4);
} else {
assert(FullDetour != NULL);
g_ClientCommandDetour = DETOUR_CREATE_STATIC_FIXED(C_ClientCommand, target);
/* Copy back the original function bytes */
memcpy(target, &FullDetour[DetourBytes], CS_DETOURCOPYBYTES_CLIENTCOMMAND);
/* Free memory used */
UTIL_CodeFree(FullDetour);
FullDetour = NULL;
if (g_ClientCommandDetour != NULL)
{
g_ClientCommandDetour->EnableDetour();
}
}
else
{
g_ClientCommandDetour->Destroy();
}
}
int Detour_ClientCommand(edict_t *pEdict)
{
if (*g_UseBotArgs)
{
int client = ENTINDEX(pEdict);
const char *args = *g_BotArgs;
return MF_ExecuteForward(g_CSCliCmdFwd, (cell)client, args);
}
return 0;
}
unsigned char *UTIL_CodeAlloc(size_t size)
{
#if defined WIN32
return (unsigned char *)VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
#elif defined __GNUC__
#if defined __APPLE__
unsigned char *addr = (unsigned char *)valloc(size);
#else
unsigned char *addr = (unsigned char *)memalign(sysconf(_SC_PAGESIZE), size);
#endif
mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
return addr;
#endif
}
void UTIL_CodeFree(unsigned char *addr)
{
#if defined WIN32
VirtualFree(addr, 0, MEM_RELEASE);
#else
free(addr);
#endif
}
void UTIL_MemProtect(void *addr, int length, int prot)
{
#if defined(__linux__) || defined(__APPLE__)
#define ALIGN(ar) ((long)ar & ~(sysconf(_SC_PAGESIZE)-1))
void *addr2 = (void *)ALIGN(addr);
mprotect(addr2, sysconf(_SC_PAGESIZE), prot);
#else
DWORD old_prot;
VirtualProtect(addr, length, prot, &old_prot);
#endif
}
bool UTIL_GetLibraryOfAddress(void *memInBase, char *buffer, size_t maxlength, uintptr_t *base)
{
#if defined(__linux__) || defined(__APPLE__)
Dl_info info;
if (!dladdr(memInBase, &info))
{
return false;
}
if (!info.dli_fbase || !info.dli_fname)
{
return false;
}
const char *dllpath = info.dli_fname;
snprintf(buffer, maxlength, "%s", dllpath);
if (base)
{
*base = (uintptr_t)info.dli_fbase;
}
#else
MEMORY_BASIC_INFORMATION mem;
if (!VirtualQuery(memInBase, &mem, sizeof(mem)))
{
return false;
}
if (mem.AllocationBase == NULL)
{
return false;
}
HMODULE dll = (HMODULE)mem.AllocationBase;
GetModuleFileName(dll, (LPTSTR)buffer, maxlength);
if (base)
{
*base = (uintptr_t)mem.AllocationBase;
}
#endif
return true;
}

3
dlls/cstrike/cstrike/CstrikeNatives.h
View File

@@ -48,9 +48,6 @@ extern bool g_precachedknife;
extern bool g_noknives;
// Globals above
void InitializeHacks();
void ShutdownHacks();
#define CHECK_ENTITY(x) \
if (x < 0 || x > gpGlobals->maxEntities) { \
MF_LogError(amx, AMX_ERR_NATIVE, "Entity out of range (%d)", x); \

10
dlls/cstrike/cstrike/amxx_api.cpp
View File

@@ -31,9 +31,12 @@
* version.
*/
#include "amxxmodule.h"
#include "CstrikeNatives.h"
extern AMX_NATIVE_INFO cstrikeNatives[];
extern int g_CSCliCmdFwd;
void InitializeHacks();
void ShutdownHacks();
int AmxxCheckGame(const char *game)
{
@@ -51,6 +54,11 @@ void OnAmxxAttach()
InitializeHacks();
}
void OnPluginsLoaded()
{
g_CSCliCmdFwd = MF_RegisterForward("CS_InternalCommand", ET_STOP, FP_CELL, FP_STRING, FP_DONE);
}
void OnAmxxDetach()
{
ShutdownHacks();