1 | /* |
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2 | * zzuf - general purpose fuzzer |
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3 | * Copyright (c) 2006 Sam Hocevar <sam@zoy.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * $Id: libzzuf.c 2345 2008-05-19 11:25:05Z sam $ |
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7 | * |
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8 | * This program is free software. It comes without any warranty, to |
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9 | * the extent permitted by applicable law. You can redistribute it |
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10 | * and/or modify it under the terms of the Do What The Fuck You Want |
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11 | * To Public License, Version 2, as published by Sam Hocevar. See |
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12 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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13 | */ |
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14 | |
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15 | /* |
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16 | * libzzuf.c: preloaded wrapper library |
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17 | */ |
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18 | |
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19 | #include "config.h" |
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20 | #define _GNU_SOURCE |
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21 | |
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22 | #if defined HAVE_STDINT_H |
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23 | # include <stdint.h> |
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24 | #elif defined HAVE_INTTYPES_H |
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25 | # include <inttypes.h> |
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26 | #endif |
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27 | #if defined HAVE_WINDOWS_H |
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28 | # include <windows.h> |
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29 | #endif |
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30 | #if defined HAVE_PROCESS_H |
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31 | # include <process.h> |
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32 | #endif |
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33 | #include <stdio.h> |
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34 | #include <sys/types.h> |
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35 | #if defined HAVE_UNISTD_H |
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36 | # include <unistd.h> |
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37 | #endif |
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38 | #include <stdlib.h> |
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39 | #include <string.h> |
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40 | #include <fcntl.h> |
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41 | |
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42 | #include <stdarg.h> |
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43 | |
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44 | #include "libzzuf.h" |
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45 | #include "debug.h" |
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46 | #include "fd.h" |
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47 | #include "sys.h" |
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48 | #include "fuzz.h" |
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49 | |
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50 | /* Library initialisation shit */ |
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51 | void _zz_init(void) __attribute__((constructor)); |
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52 | void _zz_fini(void) __attribute__((destructor)); |
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53 | #if defined HAVE_WINDOWS_H |
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54 | BOOL WINAPI DllMain(HINSTANCE, DWORD, PVOID); |
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55 | #endif |
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56 | |
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57 | /** |
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58 | * Is libzzuf fully initialised? |
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59 | */ |
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60 | int _zz_ready = 0; |
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61 | |
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62 | /** |
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63 | * The file descriptor used by libzzuf for communication with the main |
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64 | * zzuf program in debug mode. Its value is set by the ZZUF_DEBUG |
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65 | * environment variable. |
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66 | */ |
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67 | int _zz_debugfd = -1; |
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68 | |
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69 | /** |
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70 | * If set to 1, this boolean variable will prevent the called application |
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71 | * from installing signal handlers that would prevent it from really crashing. |
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72 | * SDL applications often do that when not using SDL_INIT_NOPARACHUTE, for |
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73 | * instance. Its value is set by the ZZUF_SIGNAL environment variable. |
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74 | */ |
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75 | int _zz_signal = 0; |
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76 | |
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77 | /** |
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78 | * If set to a positive value, this value will indicate the maximum number |
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79 | * of mebibytes (1 MiB = 1,048,576 bytes) that the called application will be |
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80 | * allowed to allocate. Its value is set by the ZZUF_MEMORY environment |
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81 | * variable. |
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82 | */ |
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83 | int _zz_memory = 0; |
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84 | |
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85 | /** |
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86 | * If set to 1, this boolean will tell libzzuf to fuzz network file |
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87 | * descriptors, too. Its value is set by the ZZUF_NETWORK environment |
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88 | * variable. |
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89 | */ |
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90 | int _zz_network = 0; |
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91 | |
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92 | /** |
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93 | * Library initialisation routine. |
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94 | * |
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95 | * This function reads all configuration variables put by zzuf in the |
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96 | * called process's environment and initialises diversions for the three |
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97 | * main function families: memory functions (initialised very early because |
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98 | * other functions we need such as dlsym() require them), file descriptor |
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99 | * functions and stream functions. |
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100 | */ |
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101 | void _zz_init(void) |
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102 | { |
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103 | char *tmp, *tmp2; |
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104 | |
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105 | /* We need this as soon as possible */ |
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106 | _zz_mem_init(); |
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107 | |
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108 | tmp = getenv("ZZUF_DEBUG"); |
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109 | if(tmp) |
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110 | _zz_debugfd = atoi(tmp); |
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111 | |
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112 | tmp = getenv("ZZUF_SEED"); |
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113 | if(tmp && *tmp) |
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114 | _zz_setseed(atol(tmp)); |
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115 | |
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116 | tmp = getenv("ZZUF_MINRATIO"); |
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117 | tmp2 = getenv("ZZUF_MAXRATIO"); |
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118 | if(tmp && *tmp && tmp2 && *tmp2) |
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119 | _zz_setratio(atof(tmp), atof(tmp2)); |
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120 | |
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121 | tmp = getenv("ZZUF_AUTOINC"); |
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122 | if(tmp && *tmp == '1') |
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123 | _zz_setautoinc(); |
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124 | |
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125 | tmp = getenv("ZZUF_BYTES"); |
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126 | if(tmp && *tmp) |
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127 | _zz_bytes(tmp); |
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128 | |
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129 | tmp = getenv("ZZUF_LIST"); |
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130 | if(tmp && *tmp) |
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131 | _zz_list(tmp); |
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132 | |
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133 | tmp = getenv("ZZUF_PORTS"); |
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134 | if(tmp && *tmp) |
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135 | _zz_ports(tmp); |
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136 | |
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137 | tmp = getenv("ZZUF_PROTECT"); |
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138 | if(tmp && *tmp) |
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139 | _zz_protect(tmp); |
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140 | |
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141 | tmp = getenv("ZZUF_REFUSE"); |
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142 | if(tmp && *tmp) |
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143 | _zz_refuse(tmp); |
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144 | |
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145 | tmp = getenv("ZZUF_INCLUDE"); |
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146 | if(tmp && *tmp) |
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147 | _zz_include(tmp); |
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148 | |
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149 | tmp = getenv("ZZUF_EXCLUDE"); |
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150 | if(tmp && *tmp) |
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151 | _zz_exclude(tmp); |
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152 | |
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153 | tmp = getenv("ZZUF_SIGNAL"); |
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154 | if(tmp && *tmp == '1') |
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155 | _zz_signal = 1; |
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156 | |
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157 | tmp = getenv("ZZUF_MEMORY"); |
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158 | if(tmp && *tmp == '1') |
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159 | _zz_memory = 1; |
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160 | |
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161 | tmp = getenv("ZZUF_NETWORK"); |
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162 | if(tmp && *tmp == '1') |
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163 | _zz_network = 1; |
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164 | |
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165 | _zz_fd_init(); |
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166 | _zz_sys_init(); |
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167 | |
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168 | tmp = getenv("ZZUF_STDIN"); |
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169 | if(tmp && *tmp == '1') |
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170 | _zz_register(0); |
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171 | |
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172 | _zz_ready = 1; |
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173 | |
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174 | debug("libzzuf initialised for PID %li", (long int)getpid()); |
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175 | } |
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176 | |
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177 | /** |
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178 | * Library deinitialisation routine. |
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179 | * |
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180 | * Free all the memory allocated by libzzuf during its lifetime. |
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181 | */ |
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182 | void _zz_fini(void) |
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183 | { |
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184 | _zz_fd_fini(); |
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185 | } |
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186 | |
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187 | #if defined HAVE_WINDOWS_H |
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188 | BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, PVOID impLoad) |
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189 | { |
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190 | (void)hinst; /* unused */ |
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191 | (void)impLoad; /* unused */ |
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192 | |
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193 | switch(reason) |
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194 | { |
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195 | case DLL_PROCESS_ATTACH: |
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196 | _zz_init(); |
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197 | break; |
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198 | case DLL_PROCESS_DETACH: |
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199 | _zz_fini(); |
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200 | break; |
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201 | } |
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202 | |
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203 | return TRUE; |
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204 | } |
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205 | #endif |
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206 | |
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