source: zzuf/trunk/src/libzzuf.c @ 2336

Last change on this file since 2336 was 2336, checked in by sam, 6 years ago
  • Start working on the internal code documentation.
  • Property svn:keywords set to Id
File size: 4.6 KB
Line 
1/*
2 *  zzuf - general purpose fuzzer
3 *  Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
4 *                All Rights Reserved
5 *
6 *  $Id$
7 *
8 *  This program is free software. It comes without any warranty, to
9 *  the extent permitted by applicable law. You can redistribute it
10 *  and/or modify it under the terms of the Do What The Fuck You Want
11 *  To Public License, Version 2, as published by Sam Hocevar. See
12 *  http://sam.zoy.org/wtfpl/COPYING for more details.
13 */
14
15/*
16 *  libzzuf.c: preloaded wrapper library
17 */
18
19#include "config.h"
20#define _GNU_SOURCE
21
22#if defined HAVE_STDINT_H
23#   include <stdint.h>
24#elif defined HAVE_INTTYPES_H
25#   include <inttypes.h>
26#endif
27#if defined HAVE_WINDOWS_H
28#   include <windows.h>
29#endif
30#if defined HAVE_PROCESS_H
31#   include <process.h>
32#endif
33#include <stdio.h>
34#include <sys/types.h>
35#if defined HAVE_UNISTD_H
36#   include <unistd.h>
37#endif
38#include <stdlib.h>
39#include <string.h>
40#include <fcntl.h>
41
42#include <stdarg.h>
43
44#include "libzzuf.h"
45#include "debug.h"
46#include "fd.h"
47#include "sys.h"
48#include "fuzz.h"
49
50/* Library initialisation shit */
51void _zz_init(void) __attribute__((constructor));
52void _zz_fini(void) __attribute__((destructor));
53#if defined HAVE_WINDOWS_H
54BOOL WINAPI DllMain(HINSTANCE, DWORD, PVOID);
55#endif
56
57/**
58 * Is libzzuf fully initialised?
59 */
60int   _zz_ready    = 0;
61
62/**
63 * The file descriptor used by libzzuf for communication with the main
64 * zzuf program in debug mode. Its value is set by the ZZUF_DEBUG
65 * environment variable.
66 */
67int   _zz_debugfd  = -1;
68
69/**
70 * If set to 1, this boolean variable will prevent the called application
71 * from installing signal handlers that would prevent it from really crashing.
72 * SDL applications often do that when not using SDL_INIT_NOPARACHUTE, for
73 * instance. Its value is set by the ZZUF_SIGNAL environment variable.
74 */
75int   _zz_signal   = 0;
76
77/**
78 * If set to a positive value, this value will indicate the maximum number
79 * of megabytes that the called application will be allowed to allocate. Its
80 * value is set by the ZZUF_MEMORY environment variable.
81 */
82int   _zz_memory   = 0;
83
84/**
85 * If set to 1, this boolean will tell libzzuf to fuzz network file
86 * descriptors, too. Its value is set by the ZZUF_NETWORK environment
87 * variable.
88 */
89int   _zz_network  = 0;
90
91/**
92 * Library initialisation routine.
93 *
94 * This function reads all configuration variables put by zzuf in the
95 * called process's environment and initialises diversions for the three
96 * main function families: memory functions (initialised very early because
97 * other functions we need such as dlsym() require them), file descriptor
98 * functions and stream functions.
99 */
100void _zz_init(void)
101{
102    char *tmp, *tmp2;
103
104    /* We need this as soon as possible */
105    _zz_mem_init();
106
107    tmp = getenv("ZZUF_DEBUG");
108    if(tmp)
109        _zz_debugfd = atoi(tmp);
110
111    tmp = getenv("ZZUF_SEED");
112    if(tmp && *tmp)
113        _zz_setseed(atol(tmp));
114
115    tmp = getenv("ZZUF_MINRATIO");
116    tmp2 = getenv("ZZUF_MAXRATIO");
117    if(tmp && *tmp && tmp2 && *tmp2)
118        _zz_setratio(atof(tmp), atof(tmp2));
119
120    tmp = getenv("ZZUF_AUTOINC");
121    if(tmp && *tmp == '1')
122        _zz_setautoinc();
123
124    tmp = getenv("ZZUF_BYTES");
125    if(tmp && *tmp)
126        _zz_bytes(tmp);
127
128    tmp = getenv("ZZUF_LIST");
129    if(tmp && *tmp)
130        _zz_list(tmp);
131
132    tmp = getenv("ZZUF_PORTS");
133    if(tmp && *tmp)
134        _zz_ports(tmp);
135
136    tmp = getenv("ZZUF_PROTECT");
137    if(tmp && *tmp)
138        _zz_protect(tmp);
139
140    tmp = getenv("ZZUF_REFUSE");
141    if(tmp && *tmp)
142        _zz_refuse(tmp);
143
144    tmp = getenv("ZZUF_INCLUDE");
145    if(tmp && *tmp)
146        _zz_include(tmp);
147
148    tmp = getenv("ZZUF_EXCLUDE");
149    if(tmp && *tmp)
150        _zz_exclude(tmp);
151
152    tmp = getenv("ZZUF_SIGNAL");
153    if(tmp && *tmp == '1')
154        _zz_signal = 1;
155
156    tmp = getenv("ZZUF_MEMORY");
157    if(tmp && *tmp == '1')
158        _zz_memory = 1;
159
160    tmp = getenv("ZZUF_NETWORK");
161    if(tmp && *tmp == '1')
162        _zz_network = 1;
163
164    _zz_fd_init();
165    _zz_sys_init();
166
167    tmp = getenv("ZZUF_STDIN");
168    if(tmp && *tmp == '1')
169        _zz_register(0);
170
171    _zz_ready = 1;
172
173    debug("libzzuf initialised for PID %li", (long int)getpid());
174}
175
176/**
177 * Library deinitialisation routine.
178 *
179 * Free all the memory allocated by libzzuf during its lifetime.
180 */
181void _zz_fini(void)
182{
183    _zz_fd_fini();
184}
185
186#if defined HAVE_WINDOWS_H
187BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, PVOID impLoad)
188{
189    (void)hinst;   /* unused */
190    (void)impLoad; /* unused */
191
192    switch(reason)
193    {
194        case DLL_PROCESS_ATTACH:
195            _zz_init();
196            break;
197        case DLL_PROCESS_DETACH:
198            _zz_fini();
199            break;
200    }
201
202    return TRUE;
203}
204#endif
205
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