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: lib-stream.c 1730 2007-02-01 18:19:03Z 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 | * load-stream.c: loaded stream functions |
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17 | */ |
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18 | |
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19 | #include "config.h" |
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20 | |
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21 | #define _GNU_SOURCE /* for getline() and getdelim() */ |
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22 | |
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23 | #if defined HAVE_STDINT_H |
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24 | # include <stdint.h> |
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25 | #elif defined HAVE_INTTYPES_H |
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26 | # include <inttypes.h> |
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27 | #endif |
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28 | #include <stdlib.h> |
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29 | |
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30 | #include <stdio.h> |
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31 | #include <sys/types.h> |
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32 | #if defined HAVE___SREFILL && defined HAVE_UNISTD_H |
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33 | # include <unistd.h> /* Needed for __srefill’s lseek() call */ |
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34 | #endif |
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35 | |
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36 | #include "libzzuf.h" |
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37 | #include "lib-load.h" |
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38 | #include "debug.h" |
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39 | #include "fuzz.h" |
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40 | #include "fd.h" |
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41 | |
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42 | #if defined HAVE___SREFILL |
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43 | int NEW(__srefill)(FILE *fp); |
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44 | #endif |
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45 | |
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46 | /* Library functions that we divert */ |
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47 | static FILE * (*ORIG(fopen)) (const char *path, const char *mode); |
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48 | #if defined HAVE_FOPEN64 |
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49 | static FILE * (*ORIG(fopen64)) (const char *path, const char *mode); |
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50 | #endif |
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51 | static FILE * (*ORIG(freopen)) (const char *path, const char *mode, |
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52 | FILE *stream); |
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53 | static int (*ORIG(fseek)) (FILE *stream, long offset, int whence); |
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54 | #if defined HAVE_FSEEKO |
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55 | static int (*ORIG(fseeko)) (FILE *stream, off_t offset, int whence); |
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56 | #endif |
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57 | static void (*ORIG(rewind)) (FILE *stream); |
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58 | static size_t (*ORIG(fread)) (void *ptr, size_t size, size_t nmemb, |
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59 | FILE *stream); |
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60 | static int (*ORIG(getc)) (FILE *stream); |
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61 | static int (*ORIG(fgetc)) (FILE *stream); |
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62 | #if defined HAVE__IO_GETC |
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63 | static int (*ORIG(_IO_getc)) (FILE *stream); |
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64 | #endif |
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65 | static char * (*ORIG(fgets)) (char *s, int size, FILE *stream); |
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66 | static int (*ORIG(ungetc)) (int c, FILE *stream); |
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67 | static int (*ORIG(fclose)) (FILE *fp); |
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68 | |
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69 | /* Additional GNUisms */ |
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70 | #if defined HAVE_GETLINE |
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71 | static ssize_t (*ORIG(getline)) (char **lineptr, size_t *n, FILE *stream); |
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72 | #endif |
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73 | #if defined HAVE_GETDELIM |
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74 | static ssize_t (*ORIG(getdelim)) (char **lineptr, size_t *n, int delim, |
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75 | FILE *stream); |
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76 | #endif |
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77 | #if defined HAVE___GETDELIM |
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78 | static ssize_t (*ORIG(__getdelim)) (char **lineptr, size_t *n, int delim, |
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79 | FILE *stream); |
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80 | #endif |
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81 | |
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82 | /* Additional BSDisms */ |
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83 | #if defined HAVE_FGETLN |
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84 | static char * (*ORIG(fgetln)) (FILE *stream, size_t *len); |
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85 | #endif |
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86 | #if defined HAVE___SREFILL |
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87 | int (*ORIG(__srefill)) (FILE *fp); |
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88 | #endif |
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89 | |
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90 | /* Our function wrappers */ |
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91 | #define FOPEN(fn) \ |
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92 | do \ |
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93 | { \ |
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94 | LOADSYM(fn); \ |
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95 | if(!_zz_ready) \ |
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96 | return ORIG(fn)(path, mode); \ |
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97 | _zz_lock(-1); \ |
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98 | ret = ORIG(fn)(path, mode); \ |
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99 | _zz_unlock(-1); \ |
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100 | if(ret && _zz_mustwatch(path)) \ |
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101 | { \ |
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102 | int fd = fileno(ret); \ |
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103 | _zz_register(fd); \ |
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104 | debug("%s(\"%s\", \"%s\") = [%i]", __func__, path, mode, fd); \ |
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105 | } \ |
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106 | } while(0) |
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107 | |
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108 | FILE *NEW(fopen)(const char *path, const char *mode) |
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109 | { |
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110 | FILE *ret; FOPEN(fopen); return ret; |
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111 | } |
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112 | |
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113 | #if defined HAVE_FOPEN64 |
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114 | FILE *NEW(fopen64)(const char *path, const char *mode) |
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115 | { |
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116 | FILE *ret; FOPEN(fopen64); return ret; |
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117 | } |
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118 | #endif |
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119 | |
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120 | FILE *NEW(freopen)(const char *path, const char *mode, FILE *stream) |
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121 | { |
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122 | FILE *ret; |
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123 | int fd0 = -1, fd1 = -1, disp = 0; |
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124 | |
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125 | LOADSYM(freopen); |
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126 | if(_zz_ready && (fd0 = fileno(stream)) >= 0 && _zz_iswatched(fd0)) |
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127 | { |
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128 | _zz_unregister(fd0); |
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129 | disp = 1; |
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130 | } |
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131 | |
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132 | _zz_lock(-1); |
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133 | ret = ORIG(freopen)(path, mode, stream); |
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134 | _zz_unlock(-1); |
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135 | |
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136 | if(ret && _zz_mustwatch(path)) |
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137 | { |
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138 | fd1 = fileno(ret); |
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139 | _zz_register(fd1); |
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140 | disp = 1; |
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141 | } |
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142 | |
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143 | if(disp) |
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144 | debug("%s(\"%s\", \"%s\", [%i]) = [%i]", __func__, |
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145 | path, mode, fd0, fd1); |
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146 | |
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147 | return ret; |
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148 | } |
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149 | |
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150 | #if defined HAVE___SREFILL /* Don't fuzz or seek if we have __srefill() */ |
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151 | # define FSEEK_FUZZ(fn2) |
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152 | #else |
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153 | # define FSEEK_FUZZ(fn2) \ |
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154 | if(ret == 0) \ |
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155 | { \ |
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156 | /* FIXME: check what happens when fseek()ing a pipe */ \ |
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157 | switch(whence) \ |
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158 | { \ |
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159 | case SEEK_END: \ |
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160 | offset = fn2(stream); \ |
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161 | /* fall through */ \ |
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162 | case SEEK_SET: \ |
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163 | _zz_setpos(fd, offset); \ |
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164 | break; \ |
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165 | case SEEK_CUR: \ |
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166 | _zz_addpos(fd, offset); \ |
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167 | break; \ |
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168 | } \ |
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169 | } |
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170 | #endif |
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171 | |
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172 | #define FSEEK(fn, fn2) \ |
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173 | do \ |
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174 | { \ |
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175 | int fd; \ |
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176 | LOADSYM(fn); \ |
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177 | fd = fileno(stream); \ |
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178 | if(!_zz_ready || !_zz_iswatched(fd)) \ |
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179 | return ORIG(fn)(stream, offset, whence); \ |
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180 | _zz_lock(fd); \ |
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181 | ret = ORIG(fn)(stream, offset, whence); \ |
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182 | _zz_unlock(fd); \ |
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183 | debug("%s([%i], %lli, %i) = %i", __func__, \ |
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184 | fd, (long long int)offset, whence, ret); \ |
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185 | FSEEK_FUZZ(fn2) \ |
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186 | } while(0) |
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187 | |
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188 | int NEW(fseek)(FILE *stream, long offset, int whence) |
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189 | { |
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190 | int ret; FSEEK(fseek, ftell); return ret; |
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191 | } |
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192 | |
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193 | #if defined HAVE_FSEEKO |
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194 | int NEW(fseeko)(FILE *stream, off_t offset, int whence) |
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195 | { |
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196 | int ret; FSEEK(fseeko, ftello); return ret; |
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197 | } |
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198 | #endif |
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199 | |
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200 | void NEW(rewind)(FILE *stream) |
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201 | { |
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202 | int fd; |
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203 | |
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204 | LOADSYM(rewind); |
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205 | fd = fileno(stream); |
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206 | if(!_zz_ready || !_zz_iswatched(fd)) |
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207 | { |
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208 | ORIG(rewind)(stream); |
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209 | return; |
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210 | } |
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211 | |
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212 | _zz_lock(fd); |
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213 | ORIG(rewind)(stream); |
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214 | _zz_unlock(fd); |
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215 | debug("%s([%i])", __func__, fd); |
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216 | |
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217 | #if defined HAVE___SREFILL /* Don't fuzz or seek if we have __srefill() */ |
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218 | #else |
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219 | /* FIXME: check what happens when rewind()ing a pipe */ |
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220 | _zz_setpos(fd, 0); |
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221 | #endif |
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222 | } |
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223 | |
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224 | size_t NEW(fread)(void *ptr, size_t size, size_t nmemb, FILE *stream) |
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225 | { |
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226 | int64_t pos; |
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227 | #if defined HAVE___SREFILL /* Don't fuzz or seek if we have __srefill() */ |
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228 | #else |
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229 | int64_t newpos; |
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230 | #endif |
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231 | size_t ret; |
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232 | int fd; |
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233 | |
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234 | LOADSYM(fread); |
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235 | fd = fileno(stream); |
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236 | if(!_zz_ready || !_zz_iswatched(fd)) |
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237 | return ORIG(fread)(ptr, size, nmemb, stream); |
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238 | |
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239 | pos = ftell(stream); |
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240 | _zz_lock(fd); |
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241 | ret = ORIG(fread)(ptr, size, nmemb, stream); |
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242 | _zz_unlock(fd); |
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243 | |
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244 | #if defined HAVE___SREFILL /* Don't fuzz or seek if we have __srefill() */ |
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245 | #else |
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246 | newpos = ftell(stream); |
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247 | /* XXX: the number of bytes read is not ret * size, because |
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248 | * a partial read may have advanced the stream pointer. However, |
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249 | * when reading from a pipe ftell() will return 0, and ret * size |
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250 | * is then better than nothing. */ |
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251 | if(newpos <= 0) |
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252 | { |
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253 | pos = _zz_getpos(fd); |
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254 | newpos = pos + ret * size; |
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255 | } |
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256 | if(newpos != pos) |
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257 | { |
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258 | char *b = ptr; |
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259 | |
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260 | _zz_fuzz(fd, ptr, newpos - pos); |
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261 | _zz_setpos(fd, newpos); |
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262 | |
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263 | if(newpos >= pos + 4) |
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264 | debug("%s(%p, %li, %li, [%i]) = %li \"%c%c%c%c...", __func__, ptr, |
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265 | (long int)size, (long int)nmemb, fd, (long int)ret, |
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266 | b[0], b[1], b[2], b[3]); |
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267 | else |
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268 | debug("%s(%p, %li, %li, [%i]) = %li \"%c...", __func__, ptr, |
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269 | (long int)size, (long int)nmemb, fd, (long int)ret, b[0]); |
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270 | } |
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271 | else |
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272 | #endif |
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273 | debug("%s(%p, %li, %li, [%i]) = %li", __func__, ptr, |
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274 | (long int)size, (long int)nmemb, fd, (long int)ret); |
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275 | |
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276 | return ret; |
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277 | } |
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278 | |
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279 | #if defined HAVE___SREFILL /* Don't fuzz or seek if we have __srefill() */ |
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280 | # define FGETC_FUZZ |
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281 | #else |
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282 | # define FGETC_FUZZ \ |
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283 | if(ret != EOF) \ |
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284 | { \ |
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285 | uint8_t ch = ret; \ |
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286 | _zz_fuzz(fd, &ch, 1); \ |
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287 | _zz_addpos(fd, 1); \ |
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288 | ret = ch; \ |
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289 | } |
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290 | #endif |
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291 | |
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292 | #define FGETC(fn) \ |
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293 | do { \ |
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294 | int fd; \ |
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295 | LOADSYM(fn); \ |
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296 | fd = fileno(stream); \ |
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297 | if(!_zz_ready || !_zz_iswatched(fd)) \ |
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298 | return ORIG(fn)(stream); \ |
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299 | _zz_lock(fd); \ |
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300 | ret = ORIG(fn)(stream); \ |
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301 | _zz_unlock(fd); \ |
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302 | FGETC_FUZZ \ |
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303 | if(ret == EOF) \ |
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304 | debug("%s([%i]) = EOF", __func__, fd); \ |
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305 | else \ |
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306 | debug("%s([%i]) = '%c'", __func__, fd, ret); \ |
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307 | } while(0) |
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308 | |
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309 | #undef getc /* can be a macro; we don’t want that */ |
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310 | int NEW(getc)(FILE *stream) |
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311 | { |
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312 | int ret; FGETC(getc); return ret; |
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313 | } |
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314 | |
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315 | int NEW(fgetc)(FILE *stream) |
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316 | { |
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317 | int ret; FGETC(fgetc); return ret; |
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318 | } |
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319 | |
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320 | #if defined HAVE__IO_GETC |
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321 | int NEW(_IO_getc)(FILE *stream) |
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322 | { |
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323 | int ret; FGETC(_IO_getc); return ret; |
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324 | } |
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325 | #endif |
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326 | |
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327 | char *NEW(fgets)(char *s, int size, FILE *stream) |
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328 | { |
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329 | char *ret = s; |
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330 | int fd; |
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331 | |
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332 | LOADSYM(fgets); |
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333 | LOADSYM(fgetc); |
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334 | fd = fileno(stream); |
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335 | if(!_zz_ready || !_zz_iswatched(fd)) |
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336 | return ORIG(fgets)(s, size, stream); |
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337 | |
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338 | #if defined HAVE___SREFILL /* Don't fuzz or seek if we have __srefill() */ |
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339 | _zz_lock(fd); |
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340 | ret = ORIG(fgets)(s, size, stream); |
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341 | _zz_unlock(fd); |
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342 | #else |
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343 | if(size <= 0) |
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344 | ret = NULL; |
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345 | else if(size == 1) |
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346 | s[0] = '\0'; |
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347 | else |
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348 | { |
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349 | int i; |
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350 | |
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351 | for(i = 0; i < size - 1; i++) |
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352 | { |
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353 | int ch; |
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354 | |
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355 | _zz_lock(fd); |
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356 | ch = ORIG(fgetc)(stream); |
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357 | _zz_unlock(fd); |
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358 | |
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359 | if(ch == EOF) |
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360 | { |
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361 | s[i] = '\0'; |
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362 | if(!i) |
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363 | ret = NULL; |
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364 | break; |
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365 | } |
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366 | s[i] = (char)(unsigned char)ch; |
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367 | _zz_fuzz(fd, (uint8_t *)s + i, 1); /* rather inefficient */ |
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368 | _zz_addpos(fd, 1); |
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369 | if(s[i] == '\n') |
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370 | { |
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371 | s[i + 1] = '\0'; |
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372 | break; |
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373 | } |
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374 | } |
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375 | } |
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376 | #endif |
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377 | |
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378 | debug("%s(%p, %i, [%i]) = %p", __func__, s, size, fd, ret); |
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379 | return ret; |
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380 | } |
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381 | |
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382 | int NEW(ungetc)(int c, FILE *stream) |
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383 | { |
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384 | int ret, fd; |
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385 | |
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386 | LOADSYM(ungetc); |
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387 | fd = fileno(stream); |
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388 | if(!_zz_ready || !_zz_iswatched(fd)) |
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389 | return ORIG(ungetc)(c, stream); |
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390 | |
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391 | _zz_lock(fd); |
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392 | ret = ORIG(ungetc)(c, stream); |
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393 | _zz_unlock(fd); |
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394 | |
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395 | if(ret != EOF) |
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396 | { |
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397 | struct fuzz *fuzz = _zz_getfuzz(fd); |
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398 | fuzz->uflag = 1; |
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399 | fuzz->upos = _zz_getpos(fd) - 1; |
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400 | fuzz->uchar = c; |
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401 | #if defined HAVE___SREFILL /* Don't fuzz or seek if we have __srefill() */ |
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402 | #else |
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403 | _zz_addpos(fd, -1); |
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404 | #endif |
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405 | } |
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406 | |
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407 | if(ret == EOF) |
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408 | debug("%s(0x%02x, [%i]) = EOF", __func__, c, fd); |
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409 | else |
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410 | debug("%s(0x%02x, [%i]) = '%c'", __func__, c, fd, ret); |
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411 | |
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412 | return ret; |
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413 | } |
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414 | |
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415 | int NEW(fclose)(FILE *fp) |
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416 | { |
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417 | int ret, fd; |
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418 | |
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419 | LOADSYM(fclose); |
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420 | fd = fileno(fp); |
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421 | if(!_zz_ready || !_zz_iswatched(fd)) |
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422 | return ORIG(fclose)(fp); |
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423 | |
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424 | _zz_lock(fd); |
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425 | ret = ORIG(fclose)(fp); |
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426 | _zz_unlock(fd); |
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427 | debug("%s([%i]) = %i", __func__, fd, ret); |
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428 | _zz_unregister(fd); |
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429 | |
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430 | return ret; |
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431 | } |
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432 | |
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433 | #define GETDELIM(fn, delim, need_delim) \ |
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434 | do { \ |
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435 | char *line; \ |
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436 | ssize_t done, size; \ |
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437 | int fd, finished = 0; \ |
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438 | LOADSYM(fn); \ |
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439 | LOADSYM(getdelim); \ |
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440 | LOADSYM(fgetc); \ |
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441 | fd = fileno(stream); \ |
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442 | if(!_zz_ready || !_zz_iswatched(fd)) \ |
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443 | return ORIG(getdelim)(lineptr, n, delim, stream); \ |
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444 | line = *lineptr; \ |
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445 | size = line ? *n : 0; \ |
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446 | ret = done = finished = 0; \ |
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447 | for(;;) \ |
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448 | { \ |
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449 | int ch; \ |
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450 | if(done >= size) /* highly inefficient but I don't care */ \ |
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451 | line = realloc(line, size = done + 1); \ |
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452 | if(finished) \ |
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453 | { \ |
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454 | line[done] = '\0'; \ |
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455 | *n = size; \ |
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456 | *lineptr = line; \ |
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457 | break; \ |
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458 | } \ |
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459 | _zz_lock(fd); \ |
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460 | ch = ORIG(fgetc)(stream); \ |
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461 | _zz_unlock(fd); \ |
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462 | if(ch == EOF) \ |
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463 | { \ |
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464 | finished = 1; \ |
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465 | ret = done; \ |
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466 | } \ |
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467 | else \ |
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468 | { \ |
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469 | unsigned char c = ch; \ |
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470 | _zz_fuzz(fd, &c, 1); /* even more inefficient */ \ |
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471 | line[done++] = c; \ |
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472 | _zz_addpos(fd, 1); \ |
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473 | if(c == delim) \ |
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474 | { \ |
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475 | finished = 1; \ |
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476 | ret = done; \ |
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477 | } \ |
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478 | } \ |
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479 | } \ |
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480 | if(need_delim) \ |
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481 | debug("%s(%p, %p, '%c', [%i]) = %li", __func__, \ |
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482 | lineptr, n, delim, fd, (long int)ret); \ |
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483 | else \ |
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484 | debug("%s(%p, %p, [%i]) = %li", __func__, \ |
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485 | lineptr, n, fd, (long int)ret); \ |
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486 | return ret; \ |
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487 | } while(0) |
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488 | |
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489 | #if defined HAVE_GETLINE |
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490 | ssize_t NEW(getline)(char **lineptr, size_t *n, FILE *stream) |
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491 | { |
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492 | ssize_t ret; GETDELIM(getline, '\n', 0); return ret; |
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493 | } |
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494 | #endif |
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495 | |
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496 | #if defined HAVE_GETDELIM |
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497 | ssize_t NEW(getdelim)(char **lineptr, size_t *n, int delim, FILE *stream) |
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498 | { |
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499 | ssize_t ret; GETDELIM(getdelim, delim, 1); return ret; |
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500 | } |
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501 | #endif |
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502 | |
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503 | #if defined HAVE___GETDELIM |
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504 | ssize_t NEW(__getdelim)(char **lineptr, size_t *n, int delim, FILE *stream) |
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505 | { |
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506 | ssize_t ret; GETDELIM(__getdelim, delim, 1); return ret; |
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507 | } |
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508 | #endif |
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509 | |
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510 | #if defined HAVE_FGETLN |
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511 | char *NEW(fgetln)(FILE *stream, size_t *len) |
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512 | { |
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513 | char *ret; |
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514 | #if defined HAVE___SREFILL /* Don't fuzz or seek if we have __srefill() */ |
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515 | #else |
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516 | struct fuzz *fuzz; |
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517 | size_t i, size; |
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518 | #endif |
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519 | int fd; |
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520 | |
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521 | LOADSYM(fgetln); |
---|
522 | LOADSYM(fgetc); |
---|
523 | fd = fileno(stream); |
---|
524 | if(!_zz_ready || !_zz_iswatched(fd)) |
---|
525 | return ORIG(fgetln)(stream, len); |
---|
526 | |
---|
527 | #if defined HAVE___SREFILL /* Don't fuzz or seek if we have __srefill() */ |
---|
528 | _zz_lock(fd); |
---|
529 | ret = ORIG(fgetln)(stream, len); |
---|
530 | _zz_unlock(fd); |
---|
531 | #else |
---|
532 | fuzz = _zz_getfuzz(fd); |
---|
533 | |
---|
534 | for(i = size = 0; ; /* i is incremented below */) |
---|
535 | { |
---|
536 | int ch; |
---|
537 | |
---|
538 | _zz_lock(fd); |
---|
539 | ch = ORIG(fgetc)(stream); |
---|
540 | _zz_unlock(fd); |
---|
541 | |
---|
542 | if(ch == EOF) |
---|
543 | break; |
---|
544 | |
---|
545 | if(i >= size) |
---|
546 | fuzz->tmp = realloc(fuzz->tmp, (size += 80)); |
---|
547 | |
---|
548 | fuzz->tmp[i] = (char)(unsigned char)ch; |
---|
549 | _zz_fuzz(fd, (uint8_t *)fuzz->tmp + i, 1); /* rather inefficient */ |
---|
550 | _zz_addpos(fd, 1); |
---|
551 | |
---|
552 | if(fuzz->tmp[i++] == '\n') |
---|
553 | break; |
---|
554 | } |
---|
555 | |
---|
556 | *len = i; |
---|
557 | ret = fuzz->tmp; |
---|
558 | #endif |
---|
559 | |
---|
560 | debug("%s([%i], &%li) = %p", __func__, fd, (long int)*len, ret); |
---|
561 | return ret; |
---|
562 | } |
---|
563 | #endif |
---|
564 | |
---|
565 | #if defined HAVE___SREFILL |
---|
566 | int NEW(__srefill)(FILE *fp) |
---|
567 | { |
---|
568 | off_t newpos; |
---|
569 | int ret, fd, tmp; |
---|
570 | |
---|
571 | LOADSYM(__srefill); |
---|
572 | fd = fileno(fp); |
---|
573 | if(!_zz_ready || !_zz_iswatched(fd)) |
---|
574 | return ORIG(__srefill)(fp); |
---|
575 | |
---|
576 | _zz_lock(fd); |
---|
577 | ret = ORIG(__srefill)(fp); |
---|
578 | newpos = lseek(fd, 0, SEEK_CUR); |
---|
579 | _zz_unlock(fd); |
---|
580 | if(ret != EOF) |
---|
581 | { |
---|
582 | if(newpos != -1) |
---|
583 | _zz_setpos(fd, newpos - fp->_r); |
---|
584 | _zz_fuzz(fd, fp->_p, fp->_r); |
---|
585 | _zz_addpos(fd, fp->_r); |
---|
586 | } |
---|
587 | |
---|
588 | if(!_zz_islocked(fd)) |
---|
589 | debug("%s([%i]) = %i", __func__, fd, ret); |
---|
590 | |
---|
591 | return ret; |
---|
592 | } |
---|
593 | #endif |
---|
594 | |
---|