source: zzuf/trunk/src/libzzuf/sys.c @ 4672

Last change on this file since 4672 was 4672, checked in by Sam Hocevar, 11 years ago

Get the debug channel to work on Win32.

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File size: 3.6 KB
Line 
1/*
2 *  zzuf - general purpose fuzzer
3 *  Copyright (c) 2006-2010 Sam Hocevar <sam@hocevar.net>
4 *                All Rights Reserved
5 *
6 *  This program is free software. It comes without any warranty, to
7 *  the extent permitted by applicable law. You can redistribute it
8 *  and/or modify it under the terms of the Do What The Fuck You Want
9 *  To Public License, Version 2, as published by Sam Hocevar. See
10 *  http://sam.zoy.org/wtfpl/COPYING for more details.
11 */
12
13/*
14 *  sys.c: system-dependent initialisation
15 */
16
17#include "config.h"
18
19#if defined HAVE_STDINT_H
20#   include <stdint.h>
21#elif defined HAVE_INTTYPES_H
22#   include <inttypes.h>
23#endif
24
25#if defined HAVE_WINDOWS_H
26#   include <windows.h>
27#   include <imagehlp.h>
28#   include <tlhelp32.h>
29#   define import_t PIMAGE_IMPORT_DESCRIPTOR
30#   define thunk_t PIMAGE_THUNK_DATA
31#endif
32
33#include <stdio.h>
34
35#include "sys.h"
36#include "lib-load.h"
37
38#if defined HAVE_WINDOWS_H
39static void insert_funcs(void *);
40
41/* TODO: get rid of this later */
42HINSTANCE (WINAPI *LoadLibraryA_orig)(LPCSTR);
43HINSTANCE WINAPI LoadLibraryA_new(LPCSTR path)
44{
45    return LoadLibraryA_orig(path);
46}
47
48BOOL (WINAPI *AllocConsole_orig)(void);
49BOOL WINAPI AllocConsole_new(void)
50{
51    return AllocConsole_orig();
52}
53
54BOOL (WINAPI *AttachConsole_orig)(DWORD);
55BOOL WINAPI AttachConsole_new(DWORD d)
56{
57    return AttachConsole_orig(d);
58}
59#endif
60
61void _zz_sys_init(void)
62{
63#if defined HAVE_WINDOWS_H
64    MEMORY_BASIC_INFORMATION mbi;
65    MODULEENTRY32 entry;
66    void *list;
67    int k;
68
69    VirtualQuery(_zz_sys_init, &mbi, sizeof(mbi));
70    list = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, GetCurrentProcessId());
71    entry.dwSize = sizeof(entry);
72    for(k = Module32First(list, &entry); k; k = Module32Next(list, &entry))
73    {
74        if(entry.hModule == mbi.AllocationBase)
75            continue; /* Don't replace our own functions */
76
77        insert_funcs(entry.hModule);
78    }
79    CloseHandle(list);
80#else
81    /* Nothing to do on our platform */
82#endif
83}
84
85#if defined HAVE_WINDOWS_H
86static void insert_funcs(void *module)
87{
88    static zzuf_table_t *list[] =
89    {
90        table_win32,
91    };
92
93    zzuf_table_t *diversion;
94    void *lib;
95    unsigned long dummy;
96    import_t import;
97    thunk_t thunk;
98    int k, j, i;
99
100    import = (import_t)
101        ImageDirectoryEntryToData(module, TRUE,
102                                  IMAGE_DIRECTORY_ENTRY_IMPORT, &dummy);
103    if(!import)
104        return;
105
106    for (k = 0, diversion = NULL; k < sizeof(list) / sizeof(*list); )
107    {
108        if (!diversion)
109            diversion = list[k];
110
111        if (!diversion->lib)
112        {
113            k++;
114            diversion = NULL;
115            continue;
116        }
117
118        lib = GetModuleHandleA(diversion->lib);
119        *diversion->old = (void *)GetProcAddress(lib, diversion->name);
120
121        for(j = 0; import[j].Name; j++)
122        {
123            char *name = (char *)module + import[j].Name;
124            if(lstrcmpiA(name, diversion->lib) != 0)
125                continue;
126
127            thunk = (thunk_t)((char *)module + import->FirstThunk);
128            for(i = 0; thunk[i].u1.Function; i++)
129            {
130                void **func = (void **)&thunk[i].u1.Function;
131                if(*func != *diversion->old)
132                    continue;
133
134                /* FIXME: The StarCraft 2 hack uses two methods for function
135                 * diversion. See HookSsdt() and HookHotPatch(). */
136                VirtualProtect(func, sizeof(func), PAGE_EXECUTE_READWRITE, &dummy);
137                WriteProcessMemory(GetCurrentProcess(), func, &diversion->new,
138                                    sizeof(diversion->new), NULL);
139            }
140        }
141
142        diversion++;
143    }
144}
145#endif
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