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annotate fuzz-wrapfd.c @ 1356:3677a510f545 fuzz

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add wrapfd. improve fuzzer in makefile
author Matt Johnston <matt@ucc.asn.au>
date Fri, 19 May 2017 00:48:46 +0800
parents
children 08f4fa4dc6a0
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1356
3677a510f545 add wrapfd. improve fuzzer in makefile
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1 #include "includes.h"
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2 #include "fuzz-wrapfd.h"
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3
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4 static const int IOWRAP_MAXFD = FD_SETSIZE-1;
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5 static const int MAX_RANDOM_IN = 50000;
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6 static const double CHANCE_CLOSE = 1.0 / 300;
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7 static const double CHANCE_INTR = 1.0 / 200;
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8 static const double CHANCE_READ1 = 0.6;
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9 static const double CHANCE_READ2 = 0.3;
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10 static const double CHANCE_WRITE1 = 0.8;
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11 static const double CHANCE_WRITE2 = 0.3;
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12
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13 struct fdwrap {
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14 enum wrapfd_mode mode;
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15 buffer *buf;
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16 };
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17
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18 static struct fdwrap wrap_fds[IOWRAP_MAXFD+1];
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19 // for quick selection of in-use descriptors
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20 static int wrap_used[IOWRAP_MAXFD+1];
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21 static unsigned int nused;
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22 static unsigned short rand_state[3];
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23
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24 void wrapfd_setup(uint32_t seed) {
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25 nused = 0;
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26 memset(wrap_fds, 0x0, sizeof(wrap_fds));
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27
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28 *((uint32_t*)rand_state) = seed;
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29 nrand48(rand_state);
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30 }
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31
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32 void wrapfd_add(int fd, buffer *buf, enum wrapfd_mode mode) {
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33 assert(fd >= 0);
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34 assert(fd <= IOWRAP_MAXFD);
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35 assert(wrap_fds[fd].mode == UNUSED);
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36 assert(buf || mode == RANDOMIN);
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37
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38 wrap_fds[fd].mode = mode;
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39 wrap_fds[fd].buf = buf;
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40 wrap_used[nused] = fd;
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41
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42 nused++;
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43 }
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44
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45 void wrapfd_remove(int fd) {
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46 unsigned int i, j;
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47 assert(fd >= 0);
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48 assert(fd <= IOWRAP_MAXFD);
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49 assert(wrap_fds[fd].mode != UNUSED);
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50 wrap_fds[fd].mode = UNUSED;
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51
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52 // remove from used list
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53 for (i = 0, j = 0; i < nused; i++) {
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54 if (wrap_used[i] != fd) {
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55 wrap_used[j] = wrap_used[i];
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56 j++;
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57 }
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58 }
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59 nused--;
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60 }
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61
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62
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63 int wrapfd_read(int fd, void *out, size_t count) {
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64 size_t maxread;
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65 buffer *buf;
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66
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67 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode != UNUSED) {
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68 TRACE(("Bad read descriptor %d\n", fd))
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69 errno = EBADF;
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70 return -1;
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71 }
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72
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73 assert(count != 0);
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74
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75 if (erand48(rand_state) < CHANCE_CLOSE) {
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76 wrapfd_remove(fd);
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77 return 0;
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78 }
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79
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80 if (erand48(rand_state) < CHANCE_INTR) {
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81 errno = EINTR;
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82 return -1;
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83 }
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84
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85 buf = wrap_fds[fd].buf;
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86 if (buf) {
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87 maxread = MIN(buf->len - buf->pos, count);
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88 // returns 0 if buf is EOF, as intended
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89 maxread = nrand48(rand_state) % maxread + 1;
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90 memcpy(out, buf_getptr(buf, maxread), maxread);
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91 buf_incrpos(buf, maxread);
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92 return maxread;
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93 }
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94
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95 maxread = MIN(MAX_RANDOM_IN, count);
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96 maxread = nrand48(rand_state) % maxread + 1;
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97 memset(out, 0xef, maxread);
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98 return maxread;
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99 }
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100
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101 int wrapfd_write(int fd, const void* in, size_t count) {
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102 unsigned const volatile char* volin = in;
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103 unsigned int i;
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104 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode != UNUSED) {
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105 TRACE(("Bad read descriptor %d\n", fd))
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106 errno = EBADF;
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107 return -1;
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108 }
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109
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110 assert(count != 0);
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111
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112 // force read to exercise sanitisers
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113 for (i = 0; i < count; i++) {
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114 (void)volin[i];
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115 }
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116
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117 if (erand48(rand_state) < CHANCE_CLOSE) {
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118 wrapfd_remove(fd);
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119 return 0;
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120 }
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121
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122 if (erand48(rand_state) < CHANCE_INTR) {
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123 errno = EINTR;
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124 return -1;
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125 }
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126
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127 return nrand48(rand_state) % (count+1);
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128 }
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129
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130 int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds,
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131 fd_set *UNUSED(exceptfds), struct timeval *UNUSED(timeout)) {
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132 int i, nset;
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133 int ret = 0;
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134 int fdlist[IOWRAP_MAXFD+1] = {0};
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135
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136 assert(nfds <= IOWRAP_MAXFD+1);
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137
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138 if (erand48(rand_state) < CHANCE_INTR) {
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139 errno = EINTR;
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140 return -1;
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141 }
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142
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143 // read
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144 if (erand48(rand_state) < CHANCE_READ1) {
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145 for (i = 0, nset = 0; i < nfds; i++) {
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146 if (FD_ISSET(i, readfds)) {
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147 assert(wrap_fds[i].mode != UNUSED);
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148 fdlist[nset] = i;
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149 }
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150 }
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151 FD_ZERO(readfds);
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152
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153 if (nset > 0) {
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154 // set one
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155 FD_SET(fdlist[random() % nset], readfds);
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156 ret++;
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157
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158 if (erand48(rand_state) < CHANCE_READ2) {
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159 i = fdlist[random() % nset];
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160 if (!FD_ISSET(i, readfds)) {
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161 FD_SET(i, readfds);
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162 ret++;
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163 }
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164 }
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165 }
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166 }
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167
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168 // write
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169 if (erand48(rand_state) < CHANCE_WRITE1) {
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170 for (i = 0, nset = 0; i < nfds; i++) {
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171 if (FD_ISSET(i, writefds)) {
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172 assert(wrap_fds[i].mode != UNUSED);
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173 fdlist[nset] = i;
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174 }
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175 }
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176 FD_ZERO(writefds);
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177
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178 // set one
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179 if (nset > 0) {
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180 FD_SET(fdlist[nrand48(rand_state) % nset], writefds);
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181 ret++;
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182
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183 if (erand48(rand_state) < CHANCE_WRITE2) {
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184 i = fdlist[nrand48(rand_state) % nset];
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185 if (!FD_ISSET(i, writefds)) {
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186 FD_SET(i, writefds);
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187 ret++;
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188 }
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189 }
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190 }
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191 }
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192 return ret;
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193 }