Cstrike: Convert code to use CDetour and MemoryUtils.
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Arkshine
parent
d7b3b47aa4
commit
e4ff6853dd
@ -1,97 +1,66 @@
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#include <assert.h>
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#include <stdlib.h>
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#include "CstrikeDatas.h"
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#if defined(__linux__) || defined(__APPLE__)
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#include <sys/mman.h>
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#define PAGE_EXECUTE_READWRITE PROT_READ|PROT_WRITE|PROT_EXEC
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#if defined(__linux)
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#include <malloc.h>
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#endif
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#endif
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#include <MemoryUtils.h>
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#include "CDetour/detours.h"
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#if defined(__APPLE__)
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#include <mach-o/nlist.h>
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#include <mach-o/nlist.h>
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#endif
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/* Utils */
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unsigned char *UTIL_CodeAlloc(size_t size);
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void UTIL_CodeFree(unsigned char *addr);
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void UTIL_MemProtect(void *addr, int length, int prot);
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bool UTIL_GetLibraryOfAddress(void *memInBase, char *buffer, size_t maxlength, uintptr_t *base);
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/* Detours */
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void CtrlDetour_ClientCommand(bool set);
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int Detour_ClientCommand(edict_t *pEdict);
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int g_CSCliCmdFwd = -1;
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int *g_UseBotArgs = NULL;
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const char **g_BotArgs = NULL;
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CDetour *g_ClientCommandDetour = NULL;
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/* Called on startup */
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void InitializeHacks()
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{
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CtrlDetour_ClientCommand(true);
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}
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void OnPluginsLoaded()
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{
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g_CSCliCmdFwd = MF_RegisterForward("CS_InternalCommand", ET_STOP, FP_CELL, FP_STRING, FP_DONE);
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}
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void ShutdownHacks()
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{
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CtrlDetour_ClientCommand(false);
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}
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DETOUR_DECL_STATIC1(C_ClientCommand, void, edict_t*, pEdict)
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{
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if (*g_UseBotArgs)
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{
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int client = ENTINDEX(pEdict);
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const char *args = *g_BotArgs;
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if (MF_ExecuteForward(g_CSCliCmdFwd, static_cast<cell>(client), args) > 0)
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{
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return;
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}
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}
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DETOUR_STATIC_CALL(C_ClientCommand)(pEdict);
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}
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void CtrlDetour_ClientCommand(bool set)
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{
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#if defined AMD64
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#error UNSUPPORTED
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#error UNSUPPORTED
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#endif
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static unsigned char DetourOps[] =
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{
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0x50, /* push eax ; just for safety */
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0xff, 0x74, 0x24, 0x08, /* push [esp+0x8] ; push the edict pointer */
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0xe8, 0x00, 0x00, 0x00, 0x00, /* call <gate> ; call our function */
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0x83, 0xc4, 0x08, /* add esp, 8 ; correct stack */
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0x85, 0xc0, /* test eax, eax ; do != 0 test */
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0x74, 0x01, /* je <cont> ; if == 0, jump to where old func is saved */
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0xc3 /* ret ; return otherwise */
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};
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static unsigned char DetourJmp = '\xE9';
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const unsigned int DetourBytes = 18;
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const unsigned int DetourCallPos = 6;
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const unsigned int DetourJmpPos = DetourBytes + CS_DETOURCOPYBYTES_CLIENTCOMMAND;
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const unsigned int DetourJmpBytes = 5;
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static unsigned char *FullDetour = NULL;
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void *target = (void *)MDLL_ClientCommand;
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unsigned char *paddr;
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if (!g_UseBotArgs)
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{
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#if defined(__linux__) || defined(__APPLE__)
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/* Find the DLL */
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#if defined(__linux__)
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g_UseBotArgs = (int *)g_MemUtils.ResolveSymbol(target, "UseBotArgs");
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g_BotArgs = (const char **)g_MemUtils.ResolveSymbol(target, "BotArgs");
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#elif defined(__APPLE__)
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/* Using dlsym on OS X won't work because the symbols are hidden */
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char dll[256];
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uintptr_t base;
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if (!UTIL_GetLibraryOfAddress(target, dll, sizeof(dll), &base))
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{
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return;
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}
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#if defined(__linux__)
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void *handle = dlopen(dll, RTLD_NOW);
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if (!handle)
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{
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return;
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}
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g_UseBotArgs = (int *)dlsym(handle, "UseBotArgs");
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g_BotArgs = (const char **)dlsym(handle, "BotArgs");
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dlclose(handle);
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#elif defined(__APPLE__)
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/* Using dlsym on OS X won't work because the symbols are hidden */
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g_MemUtils.GetLibraryOfAddress(target, dll, sizeof(dll), &base);
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struct nlist symbols[3];
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memset(symbols, 0, sizeof(symbols));
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symbols[0].n_un.n_name = (char *)"_UseBotArgs";
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@ -102,136 +71,26 @@ void CtrlDetour_ClientCommand(bool set)
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}
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g_UseBotArgs = (int *)(base + symbols[0].n_value);
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g_BotArgs = (const char **)(base + symbols[1].n_value);
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#endif
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#else /* Windows */
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/* Find the bot args addresses */
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paddr = (unsigned char *)target + CS_CLICMD_OFFS_USEBOTARGS;
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g_UseBotArgs = *(int **)paddr;
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paddr = (unsigned char *)target + CS_CLICMD_OFFS_BOTARGS;
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g_BotArgs = (const char **)*(const char **)paddr;
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#elif defined(WIN32)
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g_UseBotArgs = *(int **)((unsigned char *)target + CS_CLICMD_OFFS_USEBOTARGS);
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g_BotArgs = (const char **)*(const char **)((unsigned char *)target + CS_CLICMD_OFFS_BOTARGS);
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#endif
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}
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if (set)
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{
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assert(FullDetour == NULL);
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FullDetour = UTIL_CodeAlloc(DetourBytes + CS_DETOURCOPYBYTES_CLIENTCOMMAND + DetourJmpBytes);
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/* Copy the main trampoline function */
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memcpy(FullDetour, DetourOps, DetourBytes);
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/* Copy our detour call into the trampoline */
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paddr = &FullDetour[DetourCallPos];
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*(unsigned long *)paddr = (unsigned long)Detour_ClientCommand - (unsigned long)(paddr + 4);
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/* Copy original bytes onto the end of the function */
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memcpy(&FullDetour[DetourBytes], target, CS_DETOURCOPYBYTES_CLIENTCOMMAND);
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/* Patch and copy the final jmp */
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paddr = &FullDetour[DetourJmpPos];
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*paddr++ = DetourJmp;
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*(unsigned long *)paddr = ((unsigned long)target + CS_DETOURCOPYBYTES_CLIENTCOMMAND)
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- (unsigned long)(paddr + 4);
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/* Now overwrite the target function with our trampoline */
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UTIL_MemProtect(target, CS_DETOURCOPYBYTES_CLIENTCOMMAND + 10, PAGE_EXECUTE_READWRITE);
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paddr = (unsigned char *)target;
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*paddr++ = DetourJmp;
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*(unsigned long *)paddr = (unsigned long)FullDetour - (unsigned long)(paddr + 4);
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} else {
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assert(FullDetour != NULL);
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g_ClientCommandDetour = DETOUR_CREATE_STATIC_FIXED(C_ClientCommand, target);
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/* Copy back the original function bytes */
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memcpy(target, &FullDetour[DetourBytes], CS_DETOURCOPYBYTES_CLIENTCOMMAND);
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/* Free memory used */
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UTIL_CodeFree(FullDetour);
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FullDetour = NULL;
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if (g_ClientCommandDetour != NULL)
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{
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g_ClientCommandDetour->EnableDetour();
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}
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}
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else
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{
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g_ClientCommandDetour->Destroy();
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}
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}
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int Detour_ClientCommand(edict_t *pEdict)
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{
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if (*g_UseBotArgs)
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{
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int client = ENTINDEX(pEdict);
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const char *args = *g_BotArgs;
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return MF_ExecuteForward(g_CSCliCmdFwd, (cell)client, args);
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}
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return 0;
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}
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unsigned char *UTIL_CodeAlloc(size_t size)
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{
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#if defined WIN32
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return (unsigned char *)VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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#elif defined __GNUC__
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#if defined __APPLE__
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unsigned char *addr = (unsigned char *)valloc(size);
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#else
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unsigned char *addr = (unsigned char *)memalign(sysconf(_SC_PAGESIZE), size);
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#endif
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mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
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return addr;
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#endif
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}
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void UTIL_CodeFree(unsigned char *addr)
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{
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#if defined WIN32
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VirtualFree(addr, 0, MEM_RELEASE);
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#else
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free(addr);
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#endif
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}
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void UTIL_MemProtect(void *addr, int length, int prot)
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{
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#if defined(__linux__) || defined(__APPLE__)
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#define ALIGN(ar) ((long)ar & ~(sysconf(_SC_PAGESIZE)-1))
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void *addr2 = (void *)ALIGN(addr);
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mprotect(addr2, sysconf(_SC_PAGESIZE), prot);
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#else
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DWORD old_prot;
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VirtualProtect(addr, length, prot, &old_prot);
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#endif
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}
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bool UTIL_GetLibraryOfAddress(void *memInBase, char *buffer, size_t maxlength, uintptr_t *base)
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{
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#if defined(__linux__) || defined(__APPLE__)
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Dl_info info;
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if (!dladdr(memInBase, &info))
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{
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return false;
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}
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if (!info.dli_fbase || !info.dli_fname)
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{
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return false;
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}
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const char *dllpath = info.dli_fname;
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snprintf(buffer, maxlength, "%s", dllpath);
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if (base)
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{
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*base = (uintptr_t)info.dli_fbase;
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}
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#else
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MEMORY_BASIC_INFORMATION mem;
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if (!VirtualQuery(memInBase, &mem, sizeof(mem)))
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{
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return false;
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}
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if (mem.AllocationBase == NULL)
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{
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return false;
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}
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HMODULE dll = (HMODULE)mem.AllocationBase;
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GetModuleFileName(dll, (LPTSTR)buffer, maxlength);
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if (base)
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{
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*base = (uintptr_t)mem.AllocationBase;
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}
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#endif
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return true;
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}
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@ -48,9 +48,6 @@ extern bool g_precachedknife;
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extern bool g_noknives;
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// Globals above
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void InitializeHacks();
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void ShutdownHacks();
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#define CHECK_ENTITY(x) \
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if (x < 0 || x > gpGlobals->maxEntities) { \
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MF_LogError(amx, AMX_ERR_NATIVE, "Entity out of range (%d)", x); \
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@ -31,9 +31,12 @@
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* version.
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*/
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#include "amxxmodule.h"
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#include "CstrikeNatives.h"
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extern AMX_NATIVE_INFO cstrikeNatives[];
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extern int g_CSCliCmdFwd;
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void InitializeHacks();
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void ShutdownHacks();
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int AmxxCheckGame(const char *game)
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{
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@ -51,6 +54,11 @@ void OnAmxxAttach()
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InitializeHacks();
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}
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void OnPluginsLoaded()
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{
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g_CSCliCmdFwd = MF_RegisterForward("CS_InternalCommand", ET_STOP, FP_CELL, FP_STRING, FP_DONE);
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}
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void OnAmxxDetach()
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{
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ShutdownHacks();
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