Mercurial > trustbridge

annotate cinst/mozilla.c @ 89:00f9b91f4039

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Do not leak a byte if the file is empty
author Andre Heinecke <aheinecke@intevation.de>
date Thu, 20 Mar 2014 18:40:15 +0000
parents b3e8e047bc2c
children bc1e6732f43c
rev   line source
44
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1
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2 #include <stdio.h>
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3 #include <stdlib.h>
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4 #include <sys/stat.h>
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5 #include <unistd.h>
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6 #include <string.h>
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7 #include <fcntl.h>
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8 #include <errno.h>
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9
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10 /* @brief IniParser for mozilla profiles.ini
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11 *
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12 * Parse data to find values formed in
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13 *
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14 * [Profile99]
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15 * IsRelative=1
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16 * Path=Profiles/fooo.bar
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17 *
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18 * or
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19 * [Profile0]
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20 * IsRelative=0
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21 * Path=c:\foo\bar\baz
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22 *
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23 * Mozilla also accepts the ini file on Windows even if it is UTF-16
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24 * encoded.
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25 * */
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26
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27
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28 /**
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29 * @brief Read a file into memory.
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30 *
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31 * @param[in] fileName Name of the file (UTF-8 encoded).
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32 * @param[out] data Newly allocated pointer to the file content.
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33 * @param[out] size Size in Bytes of the file content.
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34 * @param[in] maxSize the maximum size to read.
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35 *
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36 * @return 0 on success an error code otherwise.
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37 */
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38
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39 #define RAF_UNKNOWN -1
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40 #define RAF_UNREADABLE -2
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41 #define RAF_STATFAILED -3
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42 #define RAF_TOOLARGE -4
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43 #define RAF_OUTOFCORE -5
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44 int readFile(const char *fileName, char **data, size_t *size,
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45 const size_t maxSize)
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46 {
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47 int fd = -1;
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48 struct stat fileStat;
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49 int rc = 0;
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50 ssize_t bRead = 0;
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51 int retval = -1;
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52
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53 memset(&fileStat, 0, sizeof(fileStat));
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54
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55 fd = open(fileName, O_RDONLY);
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56 if (fd == -1) {
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57 printf("Error: %s \n", strerror(errno));
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58 retval = RAF_UNREADABLE;
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59 goto cleanup;
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60 }
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61
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62 rc = fstat(fd, &fileStat);
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63 if (rc < 0) {
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64 printf ("Stat failed with rc: %i\n", rc);
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65 retval = RAF_STATFAILED;
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66 goto cleanup;
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67 }
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68
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69 // Check the size of the file
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70 if (!fileStat.st_size) {
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71 printf("Size zero\n");
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72 retval = RAF_STATFAILED;
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73 goto cleanup;
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74 }
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75
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76 if (fileStat.st_size > maxSize &&
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77 fileStat.st_size > 0) {
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78 printf("File too large\n");
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79 retval = RAF_TOOLARGE;
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80 goto cleanup;
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81 }
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82
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83 *size = (size_t) fileStat.st_size;
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84
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85 *data = (char*) malloc(*size);
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86
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87 if (*data == NULL) {
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88 retval = RAF_OUTOFCORE;
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89 goto cleanup;
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90 }
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91
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92 bRead = read(fd, *data, *size);
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93
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94 if (bRead < 0 || (size_t) bRead != *size) {
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95 printf("Read failed\n");
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96 if (bRead == -1) {
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97 printf("Error: %s \n", strerror(errno));
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98 }
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99 retval = RAF_UNKNOWN;
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100 *size = 0;
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101 if (*data) {
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102 free(*data);
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103 printf("Nulling data\n");
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104 *data = NULL;
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105 }
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106 goto cleanup;
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107 }
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108
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109 cleanup:
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110
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111 if (fd && fd != -1) {
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112 close(fd);
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113 fd = -1;
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114 }
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115
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116 return retval;
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117 }
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118
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119
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120 #ifndef _WIN32
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121
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122 #define INI_LOCATIONS { \
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123 "/.mozilla/firefox/profiles.ini", \
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124 "/.mozilla/thunderbird/profiles.ini", \
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125 NULL }
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126
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127 /**
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128 * @brief Get a list of all mozilla profile directories for this user
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129 *
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130 * Read the profiles.ini and extract all profile paths from that.
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131 *
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132 * @return NULL terminated array of strings containing containing the
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133 * absolute path of the profile directories. The array needs to
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134 * be freed by the caller.
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135 */
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136 char **getProfilePaths() {
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137 char *homedir = NULL,
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138 **retval = NULL;
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139 const char* const iniLocations[] = INI_LOCATIONS;
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140 int i = 0;
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141
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142 homedir = getenv ("HOME");
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143
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144 if (!homedir) {
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145 printf ("Could not get HOME\n");
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146 return NULL;
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147 }
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148
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149 for (i = 0; iniLocations[i] != NULL; i++) {
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150 char *candidate[MAX_PATH_LEN],
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151 *fileContent = NULL;
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152 const size_t needed = strnlen (homedir, MAX_PATH_LEN) +
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153 strnlen (iniLocations[i], MAX_PATH_LEN);
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154 fileSize = 0;
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155 int err = 0;
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156
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157 memset (candidate, 0, MAX_PATH_LEN);
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158
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159 /* Verify that addition of strlen did not overflow and
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160 * that the buffer is large enough */
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161 if (needed < strnlen (homedir, MAX_PATH_LEN_LEN) || needed >= MAX_PATH - 1) {
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162 printf ("Error invalid HOME environment variable");
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163 return NULL;
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164 }
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165
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166 strncpy (candidate, homedir, MAX_PATH_LEN);
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167 /* Environment might have been modified */
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168 if (candidate[MAX_PATH_LEN - 1] != '\0') {
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169 printf ("Error invalid HOME");
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170 return NULL;
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171 }
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172 strncat (candidate, iniLocations[i], MAX_PATH_LEN - strnlen(candidate,
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173 MAX_PATH_LEN) - 1);
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174
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175 rc = readFile (candidate, &fileContent, &fileSize, MAX_FILESIZE);
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176
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177 if (err) {
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178 printf ("Failed to read file.\n");
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179 continue;
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180 }
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181 parseIni (fileContent, &retval);
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182 }
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183 }
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184 #else /* _WIN32 */
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185 char **getProfilePaths() {
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186 return NULL;
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187 }
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188 #endif
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189
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190 int main(int argc, char *argv) {
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191 }
http://wald.intevation.org/projects/trustbridge/