Source.Python/src/core/modules/memory/memory_scanner.cpp at Data-Update · srpg/Source.Python · GitHub

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/**

* =============================================================================

* Source Python

* =============================================================================

* This program is free software; you can redistribute it and/or modify it under

* the terms of the GNU General Public License, version 3.0, as published by the

* Free Software Foundation.

* This program is distributed in the hope that it will be useful, but WITHOUT

* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more

* details.

* You should have received a copy of the GNU General Public License along with

* this program. If not, see <http://www.gnu.org/licenses/>.

* As a special exception, the Source Python Team gives you permission

* to link the code of this program (as well as its derivative works) to

* "Half-Life 2," the "Source Engine," and any Game MODs that run on software

* by the Valve Corporation. You must obey the GNU General Public License in

* all respects for all other code used. Additionally, the Source.Python

* Development Team grants this exception to all derivative works.

//-----------------------------------------------------------------------------

// Includes

//-----------------------------------------------------------------------------

#include <stdio.h>

#ifdef _WIN32

#include <windows.h>

#else

#include <fcntl.h>

#include <link.h>

#include <sys/mman.h>

extern int PAGE_SIZE;

#define PAGE_ALIGN_UP(x) ((x + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1))

#endif

#include "dynload.h"

#include "memory_scanner.h"

#include "utilities/sp_util.h"

#include "utilities/call_python.h"

#include "sp_main.h"

#include "eiface.h"

//-----------------------------------------------------------------------------

// Externals.

//-----------------------------------------------------------------------------

extern IVEngineServer* engine;

//-----------------------------------------------------------------------------

// BinaryFile class

//-----------------------------------------------------------------------------

CBinaryFile::CBinaryFile(unsigned long ulModule, unsigned long ulBase, unsigned long ulSize)

{

m_ulModule = ulModule;

m_ulBase = ulBase;

m_ulSize = ulSize;

}

CPointer* CBinaryFile::FindSignatureRaw(object oSignature)

{

unsigned char* sigstr = (unsigned char *) PyBytes_AsString(oSignature.ptr());

if (!sigstr)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Failed to read the given signature.");

int iLength = len(oSignature);

unsigned char* base = (unsigned char *) m_ulBase;

unsigned char* end = (unsigned char *) (base + m_ulSize - iLength);

while(base < end)

{

int i = 0;

for(; i < iLength; i++)

{

if (sigstr[i] == '\x2A')

continue;

if (sigstr[i] != base[i])

break;

}

if (i == iLength)

{

return new CPointer((unsigned long) base);

}

base++;

}

return new CPointer();

}

void CBinaryFile::AddSignatureToCache(unsigned char* sigstr, int iLength, unsigned int ulAddr)

{

Signature_t sig_t = {new unsigned char[iLength+1], ulAddr};

strcpy((char*) sig_t.m_szSignature, (char*) sigstr);

m_Signatures.push_back(sig_t);

}

bool CBinaryFile::SearchSigInCache(unsigned char* sigstr, CPointer*& result)

{

PythonLog(4, "Searching for a cached signature...");

for (std::list<Signature_t>::iterator iter=m_Signatures.begin(); iter != m_Signatures.end(); ++iter)

{

Signature_t sig = *iter;

if (strcmp((const char *) sig.m_szSignature, (const char *) sigstr) == 0)

{

PythonLog(4, "Found a cached signature!");

result = new CPointer(sig.m_ulAddr);

return true;

}

PythonLog(4, "Could not find a cached signature.");

return false;

}

bool CBinaryFile::SearchSigInBinary(object oSignature, int iLength, unsigned char* sigstr, CPointer*& result)

{

PythonLog(4, "Searching in the binary...");

CPointer* pPtr = FindSignatureRaw(oSignature);

if (pPtr->IsValid())

{

PythonLog(4, "Found a signature in the binary!");

AddSignatureToCache(sigstr, iLength, pPtr->m_ulAddr);

result = pPtr;

return true;

}

delete pPtr;

PythonLog(4, "Could not find the signature in the binary.");

return false;

}

bool CBinaryFile::SearchSigHooked(object oSignature, int iLength, unsigned char* sigstr, CPointer*& result)

{

CPointer* pPtr = FindSignatureRaw(oSignature);

if (!pPtr->IsValid())

{

PythonLog(4, "Could not find a hooked signature.");

delete pPtr;

return false;

}

PythonLog(4, "Found a hooked signature!");

PythonLog(4, "Checking if it's unique...");

// Add iLength, so we start searching after the match

CPointer new_ptr = CPointer(pPtr->m_ulAddr + len(oSignature));

// Got another match after the first one?

CPointer* pNext = new_ptr.SearchBytes(oSignature, (m_ulBase + m_ulSize) - new_ptr.m_ulAddr);

bool bIsValid = pNext->IsValid();

delete pNext;

if (bIsValid)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Found more than one hooked signatures. Please pass more bytes.");

PythonLog(4, "Signature is unique!");

AddSignatureToCache(sigstr, iLength, pPtr->m_ulAddr);

result = pPtr;

return true;

}

CPointer* CBinaryFile::FindSignature(object oSignature)

{

unsigned char* sigstr = (unsigned char *) PyBytes_AsString(oSignature.ptr());

if (!sigstr)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Failed to read the given signature.");

CPointer* result = NULL;

if (SearchSigInCache(sigstr, result))

return result;

int iLength = len(oSignature);

if (SearchSigInBinary(oSignature, iLength, sigstr, result))

return result;

object oHexSig = oSignature.attr("hex")();

const char* szHexSig = extract<const char*>(oHexSig);

PythonLog(4, "Searching for a hooked signature (relative jump)...");

if (iLength <= 6)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Signature is too short to search for a hooked signature (relative jump): %s", szHexSig);

static object unhexlify = import("binascii").attr("unhexlify");

oSignature = unhexlify("E92A2A2A2A") + oSignature.slice(5, _);

if (SearchSigHooked(oSignature, iLength, sigstr, result))

return result;

PythonLog(4, "Searching for a hooked signature (absolute jump)...");

if (iLength <= 7)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Signature is too short to search for a hooked signature (absolute jump): %s", szHexSig);

oSignature = import("binascii").attr("unhexlify")("FF252A2A2A2A") + oSignature.slice(6, _);

if (SearchSigHooked(oSignature, iLength, sigstr, result))

return result;

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Could not find signature: %s", szHexSig);

return new CPointer(); // To fix a warning. This will never get called.

}

CPointer* CBinaryFile::FindSymbol(char* szSymbol)

{

#ifdef _WIN32

void* pAddr = GetProcAddress((HMODULE) m_ulModule, szSymbol);

if (!pAddr)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Could not find symbol: %s", szSymbol)

return new CPointer((unsigned long) pAddr);

#elif defined(__linux__)

dlerror();

void* pResult = dlsym((void*) m_ulModule, szSymbol);

if (!dlerror())

return new CPointer((unsigned long) pResult);

// -----------------------------------------

// We need to use mmap now that VALVe has

// made them all private!

// Thank you to DamagedSoul from AlliedMods

// for the following code.

// It can be found at:

// http://hg.alliedmods.net/sourcemod-central/file/dc361050274d/core/logic/MemoryUtils.cpp

// -----------------------------------------

struct link_map *dlmap;

struct stat dlstat;

int dlfile;

uintptr_t map_base;

Elf32_Ehdr *file_hdr;

Elf32_Shdr *sections, *shstrtab_hdr, *symtab_hdr, *strtab_hdr;

Elf32_Sym *symtab;

const char *shstrtab, *strtab;

uint16_t section_count;

uint32_t symbol_count;

dlmap = (struct link_map *) m_ulModule;

symtab_hdr = NULL;

strtab_hdr = NULL;

dlfile = open(dlmap->l_name, O_RDONLY);

if (dlfile == -1 || fstat(dlfile, &dlstat) == -1)

{

close(dlfile);

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Failed to open file. Symbol: %s", szSymbol)

}

/* Map library file into memory */

file_hdr = (Elf32_Ehdr *)mmap(NULL, dlstat.st_size, PROT_READ, MAP_PRIVATE, dlfile, 0);

map_base = (uintptr_t)file_hdr;

close(dlfile);

if (file_hdr == MAP_FAILED)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Failed to map file. Symbol: %s", szSymbol)

if (file_hdr->e_shoff == 0 || file_hdr->e_shstrndx == SHN_UNDEF)

{

munmap(file_hdr, dlstat.st_size);

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "No section header string table has been found. Symbol: %s", szSymbol)

}

sections = (Elf32_Shdr *)(map_base + file_hdr->e_shoff);

section_count = file_hdr->e_shnum;

/* Get ELF section header string table */

shstrtab_hdr = &sections[file_hdr->e_shstrndx];

shstrtab = (const char *)(map_base + shstrtab_hdr->sh_offset);

/* Iterate sections while looking for ELF symbol table and string table */

for (uint16_t i = 0; i < section_count; i++)

{

Elf32_Shdr &hdr = sections[i];

const char *section_name = shstrtab + hdr.sh_name;

if (strcmp(section_name, ".symtab") == 0)

symtab_hdr = &hdr;

else if (strcmp(section_name, ".strtab") == 0)

strtab_hdr = &hdr;

}

/* Uh oh, we don't have a symbol table or a string table */

if (symtab_hdr == NULL || strtab_hdr == NULL)

{

munmap(file_hdr, dlstat.st_size);

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "No symbol table or string table found. Symbol: %s", szSymbol)

}

symtab = (Elf32_Sym *)(map_base + symtab_hdr->sh_offset);

strtab = (const char *)(map_base + strtab_hdr->sh_offset);

symbol_count = symtab_hdr->sh_size / symtab_hdr->sh_entsize;

/* Iterate symbol table starting from the position we were at last time */

for (uint32_t i = 0; i < symbol_count; i++)

{

Elf32_Sym &sym = symtab[i];

unsigned char sym_type = ELF32_ST_TYPE(sym.st_info);

const char *sym_name = strtab + sym.st_name;

/* Skip symbols that are undefined or do not refer to functions or objects */

if (sym.st_shndx == SHN_UNDEF || (sym_type != STT_FUNC && sym_type != STT_OBJECT))

continue;

if (strcmp(szSymbol, sym_name) == 0)

{

pResult = (void *)(dlmap->l_addr + sym.st_value);

break;

}

// Unmap the file now.

munmap(file_hdr, dlstat.st_size);

if (!pResult)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Could not find symbol: %s", szSymbol)

return new CPointer((unsigned long) pResult);

#else

#error "BinaryFile::FindSymbol() is not implemented on this OS"

#endif

}

CPointer* CBinaryFile::FindPointer(object oIdentifier, int iOffset, unsigned int iLevel)

{

CPointer* ptr = FindAddress(oIdentifier);

if (ptr->IsValid())

{

ptr->m_ulAddr += iOffset;

while (iLevel > 0)

{

ptr->m_ulAddr = GetPtrHelper(ptr->m_ulAddr);

iLevel = iLevel - 1;

}

return ptr;

}

CPointer* CBinaryFile::FindAddress(object oIdentifier)

{

if(CheckClassname(oIdentifier, "bytes"))

return FindSignature(oIdentifier);

return FindSymbol(extract<char*>(oIdentifier));

}

dict CBinaryFile::GetSymbols()

{

dict result;

#ifdef _WIN32

PIMAGE_DOS_HEADER dos_header = (PIMAGE_DOS_HEADER) m_ulModule;

if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Unable to retrieve DOS header.")

PIMAGE_NT_HEADERS nt_headers = (PIMAGE_NT_HEADERS) ((BYTE *) m_ulModule + dos_header->e_lfanew);

if (nt_headers->Signature != IMAGE_NT_SIGNATURE)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Unable to retrieve NT headers.")

if (nt_headers->OptionalHeader.NumberOfRvaAndSizes <= 0)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Invalid number of directories in the optional header.")

PIMAGE_EXPORT_DIRECTORY exports = (PIMAGE_EXPORT_DIRECTORY) (

(BYTE *) m_ulModule

+ nt_headers->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress);

if (exports->AddressOfNames == NULL)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Address of names is NULL.")

BYTE** symbols = (BYTE**)(m_ulModule + exports->AddressOfNames);

for (DWORD i=0; i < exports->NumberOfNames; i++)

{

const char* name = (const char*) (m_ulModule + symbols[i]);

// TODO: Don't use GetProcAddress. There is probably a faster way

result[name] = CPointer((unsigned long) GetProcAddress((HMODULE) m_ulModule, name));

}

#elif __linux__

// TODO: Remove duplicated code. See also: FindSymbol()

struct link_map *dlmap;

struct stat dlstat;

int dlfile;

uintptr_t map_base;

Elf32_Ehdr *file_hdr;

Elf32_Shdr *sections, *shstrtab_hdr, *symtab_hdr, *strtab_hdr;

Elf32_Sym *symtab;

const char *shstrtab, *strtab;

uint16_t section_count;

uint32_t symbol_count;

dlmap = (struct link_map *) m_ulModule;

symtab_hdr = NULL;

strtab_hdr = NULL;

dlfile = open(dlmap->l_name, O_RDONLY);

if (dlfile == -1 || fstat(dlfile, &dlstat) == -1)

{

close(dlfile);

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Failed to open file.")

}

/* Map library file into memory */

file_hdr = (Elf32_Ehdr *)mmap(NULL, dlstat.st_size, PROT_READ, MAP_PRIVATE, dlfile, 0);

map_base = (uintptr_t)file_hdr;

close(dlfile);

if (file_hdr == MAP_FAILED)

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Failed to map file.")

if (file_hdr->e_shoff == 0 || file_hdr->e_shstrndx == SHN_UNDEF)

{

munmap(file_hdr, dlstat.st_size);

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "No section header string table has been found.")

}

sections = (Elf32_Shdr *)(map_base + file_hdr->e_shoff);

section_count = file_hdr->e_shnum;

/* Get ELF section header string table */

shstrtab_hdr = &sections[file_hdr->e_shstrndx];

shstrtab = (const char *)(map_base + shstrtab_hdr->sh_offset);

/* Iterate sections while looking for ELF symbol table and string table */

for (uint16_t i = 0; i < section_count; i++)

{

Elf32_Shdr &hdr = sections[i];

const char *section_name = shstrtab + hdr.sh_name;

if (strcmp(section_name, ".symtab") == 0)

symtab_hdr = &hdr;

else if (strcmp(section_name, ".strtab") == 0)

strtab_hdr = &hdr;

}

/* Uh oh, we don't have a symbol table or a string table */

if (symtab_hdr == NULL || strtab_hdr == NULL)

{

munmap(file_hdr, dlstat.st_size);

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "No symbol table or string table found.")

}

symtab = (Elf32_Sym *)(map_base + symtab_hdr->sh_offset);

strtab = (const char *)(map_base + strtab_hdr->sh_offset);

symbol_count = symtab_hdr->sh_size / symtab_hdr->sh_entsize;

/* Iterate symbol table starting from the position we were at last time */

for (uint32_t i = 0; i < symbol_count; i++)

{

Elf32_Sym &sym = symtab[i];

unsigned char sym_type = ELF32_ST_TYPE(sym.st_info);

const char *sym_name = strtab + sym.st_name;

/* Skip symbols that are undefined or do not refer to functions or objects */

if (sym.st_shndx == SHN_UNDEF || (sym_type != STT_FUNC && sym_type != STT_OBJECT))

continue;

result[sym_name] = CPointer((unsigned long)(dlmap->l_addr + sym.st_value));

}

// Unmap the file now.

munmap(file_hdr, dlstat.st_size);

#else

#error Unsupported platform.

#endif

return result;

}

//-----------------------------------------------------------------------------

// CBinaryManager class

//-----------------------------------------------------------------------------

// Small helper function

bool str_ends_with(const char *szString, const char *szSuffix)

{

int stringlen = strlen(szString);

int suffixlen = strlen(szSuffix);

if (suffixlen > stringlen)

return false;

return strncmp(szString + stringlen - suffixlen, szSuffix, suffixlen) == 0;

}

CBinaryFile* CBinaryManager::FindBinary(char* szPath, bool bSrvCheck /* = true */, bool bCheckExtension /* = true */)

{

std::string szBinaryPath = szPath;

#ifdef __linux__

if (bCheckExtension) {

if (bSrvCheck && !str_ends_with(szBinaryPath.data(), "_srv") && !str_ends_with(szBinaryPath.data(), ".so"))

szBinaryPath += "_srv.so";

else if (!str_ends_with(szBinaryPath.data(), ".so"))

szBinaryPath += ".so";

}

#endif

unsigned long ulModule = (unsigned long) dlLoadLibrary(szBinaryPath.data());

unsigned long ulBase = 0;

#ifdef __linux__

if (!ulModule)

{

char szGameDir[MAX_PATH_LENGTH];

engine->GetGameDir(szGameDir, MAX_PATH_LENGTH);

// If the previous path failed, try the "bin" folder of the game.

// This will allow passing e.g. "server" to this function.

szBinaryPath = std::string(szGameDir) + "/bin/" + szBinaryPath;

ulModule = (unsigned long) dlLoadLibrary(szBinaryPath.data());

}

#endif

if (!ulModule)

{

szBinaryPath = "Unable to find " + szBinaryPath;

#ifdef _WIN32

if (bCheckExtension && !str_ends_with(szBinaryPath.data(), ".dll"))

szBinaryPath += ".dll";

#endif

BOOST_RAISE_EXCEPTION(PyExc_IOError, szBinaryPath.data())

}

// Search for an existing BinaryFile object

for (std::list<CBinaryFile *>::iterator iter=m_Binaries.begin(); iter != m_Binaries.end(); ++iter)

{

CBinaryFile* binary = *iter;

if (binary->m_ulModule == ulModule)

{

// We don't need to open it several times

dlFreeLibrary((DLLib *) ulModule);

return binary;

}

unsigned long ulSize;

#ifdef _WIN32

IMAGE_DOS_HEADER* dos = (IMAGE_DOS_HEADER *) ulModule;

IMAGE_NT_HEADERS* nt = (IMAGE_NT_HEADERS *) ((BYTE *) dos + dos->e_lfanew);

ulSize = nt->OptionalHeader.SizeOfImage;

ulBase = ulModule;

#elif defined(__linux__)

// Copied from here. Thanks!

// https://github.com/alliedmodders/sourcemod/blob/237db0504c7a59e394828446af3e8ca3d53ef647/core/logic/MemoryUtils.cpp#L486

Elf32_Ehdr *file;

Elf32_Phdr *phdr;

uint16_t phdrCount;

struct link_map *lm = (struct link_map*) ulModule;

ulBase = reinterpret_cast<uintptr_t>(lm->l_addr);

file = reinterpret_cast<Elf32_Ehdr *>(ulBase);

/* Check ELF magic */

if (memcmp(ELFMAG, file->e_ident, SELFMAG) != 0)

{

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "ELF magic check failed.");

}

/* Check ELF version */

if (file->e_ident[EI_VERSION] != EV_CURRENT)

{

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "ELF version check failed.");

}

/* Check ELF architecture, which is 32-bit/x86 right now

* Should change this for 64-bit if Valve gets their act together

if (file->e_ident[EI_CLASS] != ELFCLASS32 || file->e_machine != EM_386 || file->e_ident[EI_DATA] != ELFDATA2LSB)

{

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "ELF architecture check failed.");

}

/* For our purposes, this must be a dynamic library/shared object */

if (file->e_type != ET_DYN)

{

BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Library is not a dynamic or shared object.");

}

phdrCount = file->e_phnum;

phdr = reinterpret_cast<Elf32_Phdr *>(ulBase + file->e_phoff);

for (uint16_t i = 0; i < phdrCount; i++)

{

Elf32_Phdr &hdr = phdr[i];

/* We only really care about the segment with executable code */

if (hdr.p_type == PT_LOAD && hdr.p_flags == (PF_X|PF_R))

{

/* From glibc, elf/dl-load.c:

* c->mapend = ((ph->p_vaddr + ph->p_filesz + GLRO(dl_pagesize) - 1)

* & ~(GLRO(dl_pagesize) - 1));

* In glibc, the segment file size is aligned up to the nearest page size and

* added to the virtual address of the segment. We just want the size here.

ulSize = PAGE_ALIGN_UP(hdr.p_filesz);

break;

}

#else

#error "BinaryManager::FindBinary() is not implemented on this OS"

#endif

// Create a new Binary object and add it to the list

CBinaryFile* binary = new CBinaryFile(ulModule, ulBase, ulSize);

m_Binaries.push_front(binary);

return binary;

}

//-----------------------------------------------------------------------------

// Functions

//-----------------------------------------------------------------------------

CBinaryFile* FindBinary(char* szPath, bool bSrvCheck /* = true */, bool bCheckExtension /* = true */)

{

return s_pBinaryManager->FindBinary(szPath, bSrvCheck, bCheckExtension);

}

Source.Python/src/core/modules/memory/memory_scanner.cpp at Data-Update · srpg/Source.Python · GitHub

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