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engFunc.cpp
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engFunc.cpp
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#include "engFunc.h"
#include <extdll.h>
#include <meta_api.h>
module swds = {NULL, 0, NULL};
#if defined _WIN32
int FindModuleByAddr (void *addr, module *lib)
{
MEMORY_BASIC_INFORMATION mem;
VirtualQuery(addr, &mem, sizeof(mem));
IMAGE_DOS_HEADER *dos = (IMAGE_DOS_HEADER*)mem.AllocationBase;
IMAGE_NT_HEADERS *pe = (IMAGE_NT_HEADERS*)((unsigned long)dos+(unsigned long)dos->e_lfanew);
if(pe->Signature != IMAGE_NT_SIGNATURE)
{
return FALSE;
}
else
{
lib->base = mem.AllocationBase;
lib->size = (size_t)pe->OptionalHeader.SizeOfImage;
lib->handler = lib->base;
return TRUE;
}
}
#else
// Code derived from code from David Anderson
// You're going to help us, Mr. Anderson whether you want to or not. (c)
long getBaseLen(void *baseAddress)
{
pid_t pid = getpid();
char file[255];
char buffer[2048];
snprintf(file, sizeof(file)-1, "/proc/%d/maps", pid);
FILE *fp = fopen(file, "rt");
if (fp)
{
long length = 0;
void *start = NULL;
void *end = NULL;
while (!feof(fp))
{
if (fgets(buffer, sizeof(buffer)-1, fp) == NULL)
return 0;
sscanf(buffer, "%lx-%lx", reinterpret_cast< long unsigned int * > (&start), reinterpret_cast< long unsigned int * > (&end));
if(start == baseAddress)
{
length = (unsigned long)end - (unsigned long)start;
char ignore[100];
int value;
while(!feof(fp))
{
if (fgets(buffer, sizeof(buffer)-1, fp) == NULL)
return 0;
sscanf
(
buffer,
"%lx-%lx %*s %*s %*s %d",
reinterpret_cast< long unsigned int * > (&start),
reinterpret_cast< long unsigned int * > (&end),
&value
);
if(!value)
{
break;
}
else
{
length += (unsigned long)end - (unsigned long)start;
}
}
break;
}
}
fclose(fp);
return length;
}
return 0;
}
int FindModuleByAddr (void *addr, module *lib)
{
if (!lib)
return FALSE;
Dl_info info;
if (!dladdr(addr, &info) && !info.dli_fbase || !info.dli_fname)
{
return FALSE;
}
else
{
lib->base = info.dli_fbase;
lib->size = (size_t)getBaseLen(lib->base);
lib->handler = dlopen(info.dli_fname, RTLD_NOW);
return TRUE;
}
}
#endif
void *FindFunction (module *lib, signature sig)
{
if (!lib)
return NULL;
if (!sig.text || !sig.mask || sig.size == 0)
return NULL;
unsigned char *pBuff = (unsigned char *)lib->base;
unsigned char *pEnd = (unsigned char *)lib->base+lib->size-sig.size;
unsigned long i;
while (pBuff < pEnd)
{
for (i = 0; i < sig.size; i++) {
if ((sig.mask[i] != '?') && ((unsigned char)(sig.text[i]) != pBuff[i]))
break;
}
if (i == sig.size)
return (void*)pBuff;
pBuff++;
}
return NULL;
}
void *FindFunction (module *lib, const char *name)
{
if (!lib)
return NULL;
return DLSYM((DLHANDLE)lib->handler, name);
}
void *FindFunction (function *func)
{
if (!func)
return NULL;
void *address = NULL;
if (NULL == (address = FindFunction(func->lib, func->name)))
{
return FindFunction(func->lib, func->sig);
}
if (CVAR_GET_FLOAT("developer") != 0.0)
ALERT(at_logged, "[Floodblocker]: Function %s founded by NAME\n", func->name);
return address;
}
void SetHook(function *func)
{
if(AllowWriteToMemory(func->address))
memcpy(func->address, func->patch, 5);
}
void UnsetHook(function *func)
{
if(AllowWriteToMemory(func->address))
memcpy(func->address, func->origin, 5);
}
int CreateFunctionHook(function *func)
{
if (!func)
return 0;
if (NULL != (func->address = (unsigned char*)FindFunction(func)))
{
memcpy(func->origin, func->address, 5);
func->patch[0]=0xE9;
*(unsigned long *)&func->patch[1] = (unsigned long)func->handler-(unsigned long)func->address-5;
if (CVAR_GET_FLOAT("developer") != 0.0)
ALERT(at_logged, "[Floodblocker]: Function %s founded at %08X\n", func->name, (unsigned long)func->address);
return (func->done = TRUE);
}
else
return (func->done = FALSE);
}
int AllowWriteToMemory(void *address)
{
#if defined _WIN32
DWORD OldProtection, NewProtection = PAGE_EXECUTE_READWRITE;
if (VirtualProtect(address, 5, NewProtection, &OldProtection))
#else
void* alignedAddress = Align(address);
if (!mprotect(alignedAddress, sysconf(_SC_PAGESIZE), (PROT_READ | PROT_WRITE | PROT_EXEC)))
#endif
return TRUE;
return FALSE;
}