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330 lines
7.3 KiB
C
330 lines
7.3 KiB
C
/* This is general enough to break out into capnhook eventually.
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Don't introduce util/ dependencies here. */
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#include <windows.h>
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#include <assert.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include "hook/table.h"
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#include "hooklib/dll.h"
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struct dll_hook_reg {
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const wchar_t *name;
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HMODULE redir_mod;
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const struct hook_symbol *syms;
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size_t nsyms;
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};
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/* Helper functions */
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static void dll_hook_init(void);
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static HMODULE dll_hook_search_dll(const wchar_t *name);
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/* Hook functions */
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static HMODULE WINAPI hook_GetModuleHandleA(const char *name);
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static HMODULE WINAPI hook_GetModuleHandleW(const wchar_t *name);
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static HMODULE WINAPI hook_LoadLibraryA(const char *name);
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static HMODULE WINAPI hook_LoadLibraryW(const wchar_t *name);
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static void * WINAPI hook_GetProcAddress(HMODULE mod, const char *name);
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/* Link pointers */
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static HMODULE WINAPI (*next_GetModuleHandleA)(const char *name);
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static HMODULE WINAPI (*next_GetModuleHandleW)(const wchar_t *name);
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static HMODULE WINAPI (*next_LoadLibraryA)(const char *name);
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static HMODULE WINAPI (*next_LoadLibraryW)(const wchar_t *name);
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static void * WINAPI (*next_GetProcAddress)(HMODULE mod, const char *name);
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static const struct hook_symbol dll_loader_syms[] = {
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{
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.name = "GetModuleHandleA",
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.patch = hook_GetModuleHandleA,
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.link = (void **) &next_GetModuleHandleA,
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}, {
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.name = "GetModuleHandleW",
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.patch = hook_GetModuleHandleW,
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.link = (void **) &next_GetModuleHandleW,
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}, {
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.name = "LoadLibraryA",
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.patch = hook_LoadLibraryA,
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.link = (void **) &next_LoadLibraryA,
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}, {
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.name = "LoadLibraryW",
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.patch = hook_LoadLibraryW,
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.link = (void **) &next_LoadLibraryW,
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}, {
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.name = "GetProcAddress",
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.patch = hook_GetProcAddress,
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.link = (void **) &next_GetProcAddress,
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}
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};
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static bool dll_hook_initted;
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static CRITICAL_SECTION dll_hook_lock;
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static struct dll_hook_reg *dll_hook_list;
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static size_t dll_hook_count;
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HRESULT dll_hook_push(
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HMODULE redir_mod,
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const wchar_t *name,
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const struct hook_symbol *syms,
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size_t nsyms)
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{
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struct dll_hook_reg *new_item;
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struct dll_hook_reg *new_mem;
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HRESULT hr;
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assert(name != NULL);
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assert(syms != NULL);
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dll_hook_init();
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EnterCriticalSection(&dll_hook_lock);
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new_mem = realloc(
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dll_hook_list,
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(dll_hook_count + 1) * sizeof(struct dll_hook_reg));
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if (new_mem == NULL) {
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hr = E_OUTOFMEMORY;
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goto end;
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}
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new_item = &new_mem[dll_hook_count];
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new_item->name = name;
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new_item->syms = syms;
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new_item->nsyms = nsyms;
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dll_hook_list = new_mem;
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dll_hook_count++;
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hr = S_OK;
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end:
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LeaveCriticalSection(&dll_hook_lock);
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return hr;
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}
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static void dll_hook_init(void)
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{
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HMODULE kernel32;
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/* Init is not thread safe, because API hooking is not thread safe. */
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if (dll_hook_initted) {
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return;
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}
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dll_hook_initted = true;
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InitializeCriticalSection(&dll_hook_lock);
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/* Protect against the (probably impossible) scenario where nothing in the
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process imports LoadLibraryW but something imports LoadLibraryA.
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We know something imports GetModuleHandleW because we do, right here.
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(we're about to hook these APIs of course, so we have to set this up
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before the hooks go in) */
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kernel32 = GetModuleHandleW(L"kernel32.dll");
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next_LoadLibraryW = (void *) GetProcAddress(kernel32, "LoadLibraryW");
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/* Now we can apply the hook table */
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hook_table_apply(
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NULL,
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"kernel32.dll",
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dll_loader_syms,
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_countof(dll_loader_syms));
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}
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static HMODULE dll_hook_search_dll(const wchar_t *name)
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{
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HMODULE result;
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size_t i;
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result = NULL;
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EnterCriticalSection(&dll_hook_lock);
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for (i = 0 ; i < dll_hook_count ; i++) {
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if (wcsicmp(name, dll_hook_list[i].name) == 0) {
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result = dll_hook_list[i].redir_mod;
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break;
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}
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}
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LeaveCriticalSection(&dll_hook_lock);
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return result;
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}
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static HMODULE WINAPI hook_GetModuleHandleA(const char *name)
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{
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HMODULE result;
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wchar_t *name_w;
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size_t name_c;
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if (name == NULL) {
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return next_GetModuleHandleA(NULL);
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}
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mbstowcs_s(&name_c, NULL, 0, name, 0);
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name_w = malloc(name_c * sizeof(wchar_t));
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if (name_w == NULL) {
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SetLastError(ERROR_OUTOFMEMORY);
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return NULL;
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}
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mbstowcs_s(NULL, name_w, name_c, name, name_c - 1);
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result = hook_GetModuleHandleW(name_w);
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free(name_w);
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return result;
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}
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static HMODULE WINAPI hook_GetModuleHandleW(const wchar_t *name)
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{
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HMODULE result;
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if (name == NULL) {
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return next_GetModuleHandleW(NULL);
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}
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result = dll_hook_search_dll(name);
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if (result != NULL) {
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SetLastError(ERROR_SUCCESS);
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} else {
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result = next_GetModuleHandleW(name);
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}
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return result;
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}
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static HMODULE WINAPI hook_LoadLibraryA(const char *name)
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{
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HMODULE result;
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wchar_t *name_w;
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size_t name_c;
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if (name == NULL) {
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SetLastError(ERROR_INVALID_PARAMETER);
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return NULL;
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}
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mbstowcs_s(&name_c, NULL, 0, name, 0);
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name_w = malloc(name_c * sizeof(wchar_t));
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if (name_w == NULL) {
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SetLastError(ERROR_OUTOFMEMORY);
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return NULL;
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}
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mbstowcs_s(NULL, name_w, name_c, name, name_c - 1);
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result = hook_LoadLibraryW(name_w);
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free(name_w);
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return result;
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}
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static HMODULE WINAPI hook_LoadLibraryW(const wchar_t *name)
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{
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HMODULE result;
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if (name == NULL) {
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SetLastError(ERROR_INVALID_PARAMETER);
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return NULL;
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}
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result = dll_hook_search_dll(name);
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if (result != NULL) {
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SetLastError(ERROR_SUCCESS);
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} else {
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result = next_LoadLibraryW(name);
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}
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return result;
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}
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/* TODO LoadLibraryExA, LoadLibraryExW */
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static void * WINAPI hook_GetProcAddress(HMODULE mod, const char *name)
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{
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const struct hook_symbol *syms;
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uintptr_t ordinal;
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size_t nsyms;
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size_t i;
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if (name == NULL) {
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SetLastError(ERROR_INVALID_PARAMETER);
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return NULL;
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}
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syms = NULL;
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nsyms = 0;
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EnterCriticalSection(&dll_hook_lock);
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for (i = 0 ; i < dll_hook_count ; i++) {
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if (dll_hook_list[i].redir_mod == mod) {
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syms = dll_hook_list[i].syms;
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nsyms = dll_hook_list[i].nsyms;
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break;
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}
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}
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LeaveCriticalSection(&dll_hook_lock);
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if (syms == NULL) {
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return next_GetProcAddress(mod, name);
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}
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ordinal = (uintptr_t) name;
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if (ordinal > 0xFFFF) {
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/* Import by name */
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for (i = 0 ; i < nsyms ; i++) {
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if (strcmp(name, syms[i].name) == 0) {
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break;
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}
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}
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} else {
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/* Import by ordinal (and name != NULL so ordinal != 0) */
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for (i = 0 ; i < nsyms ; i++) {
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if (ordinal == syms[i].ordinal) {
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break;
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}
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}
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}
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if (i < nsyms) {
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SetLastError(ERROR_SUCCESS);
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return syms[i].patch;
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} else {
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/* GetProcAddress sets this error on failure, although of course MSDN
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does not see fit to document the exact error code. */
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SetLastError(ERROR_PROC_NOT_FOUND);
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return NULL;
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}
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}
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