1 | /***************************************************************************
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2 | * _ _ ____ _
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3 | * Project ___| | | | _ \| |
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4 | * / __| | | | |_) | |
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5 | * | (__| |_| | _ <| |___
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6 | * \___|\___/|_| \_\_____|
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7 | *
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8 | * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 | *
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10 | * This software is licensed as described in the file COPYING, which
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11 | * you should have received as part of this distribution. The terms
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12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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13 | *
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14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 | * copies of the Software, and permit persons to whom the Software is
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16 | * furnished to do so, under the terms of the COPYING file.
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17 | *
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18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 | * KIND, either express or implied.
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20 | *
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21 | ***************************************************************************/
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22 | #include "tool_setup.h"
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23 |
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24 | #include "strcase.h"
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25 |
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26 | #define ENABLE_CURLX_PRINTF
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27 | /* use our own printf() functions */
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28 | #include "curlx.h"
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29 |
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30 | #include "tool_cfgable.h"
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31 | #include "tool_doswin.h"
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32 | #include "tool_msgs.h"
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33 | #include "tool_cb_hdr.h"
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34 |
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35 | #include "memdebug.h" /* keep this as LAST include */
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36 |
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37 | static char *parse_filename(const char *ptr, size_t len);
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38 |
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39 | /*
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40 | ** callback for CURLOPT_HEADERFUNCTION
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41 | */
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42 |
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43 | size_t tool_header_cb(char *ptr, size_t size, size_t nmemb, void *userdata)
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44 | {
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45 | struct HdrCbData *hdrcbdata = userdata;
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46 | struct OutStruct *outs = hdrcbdata->outs;
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47 | struct OutStruct *heads = hdrcbdata->heads;
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48 | const char *str = ptr;
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49 | const size_t cb = size * nmemb;
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50 | const char *end = (char *)ptr + cb;
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51 | char *url = NULL;
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52 |
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53 | /*
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54 | * Once that libcurl has called back tool_header_cb() the returned value
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55 | * is checked against the amount that was intended to be written, if
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56 | * it does not match then it fails with CURLE_WRITE_ERROR. So at this
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57 | * point returning a value different from sz*nmemb indicates failure.
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58 | */
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59 | size_t failure = (size && nmemb) ? 0 : 1;
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60 |
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61 | if(!heads->config)
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62 | return failure;
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63 |
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64 | #ifdef DEBUGBUILD
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65 | if(size * nmemb > (size_t)CURL_MAX_HTTP_HEADER) {
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66 | warnf(heads->config->global, "Header data exceeds single call write "
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67 | "limit!\n");
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68 | return failure;
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69 | }
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70 | #endif
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71 |
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72 | /*
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73 | * Write header data when curl option --dump-header (-D) is given.
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74 | */
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75 |
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76 | if(heads->config->headerfile && heads->stream) {
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77 | size_t rc = fwrite(ptr, size, nmemb, heads->stream);
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78 | if(rc != cb)
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79 | return rc;
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80 | /* flush the stream to send off what we got earlier */
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81 | (void)fflush(heads->stream);
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82 | }
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83 |
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84 | /*
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85 | * This callback sets the filename where output shall be written when
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86 | * curl options --remote-name (-O) and --remote-header-name (-J) have
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87 | * been simultaneously given and additionally server returns an HTTP
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88 | * Content-Disposition header specifying a filename property.
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89 | */
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90 |
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91 | if(hdrcbdata->honor_cd_filename &&
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92 | (cb > 20) && checkprefix("Content-disposition:", str) &&
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93 | !curl_easy_getinfo(outs->config->easy, CURLINFO_EFFECTIVE_URL, &url) &&
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94 | url && (checkprefix("http://", url) || checkprefix("https://", url))) {
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95 | const char *p = str + 20;
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96 |
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97 | /* look for the 'filename=' parameter
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98 | (encoded filenames (*=) are not supported) */
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99 | for(;;) {
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100 | char *filename;
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101 | size_t len;
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102 |
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103 | while(*p && (p < end) && !ISALPHA(*p))
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104 | p++;
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105 | if(p > end - 9)
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106 | break;
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107 |
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108 | if(memcmp(p, "filename=", 9)) {
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109 | /* no match, find next parameter */
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110 | while((p < end) && (*p != ';'))
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111 | p++;
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112 | continue;
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113 | }
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114 | p += 9;
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115 |
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116 | /* this expression below typecasts 'cb' only to avoid
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117 | warning: signed and unsigned type in conditional expression
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118 | */
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119 | len = (ssize_t)cb - (p - str);
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120 | filename = parse_filename(p, len);
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121 | if(filename) {
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122 | outs->filename = filename;
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123 | outs->alloc_filename = TRUE;
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124 | outs->is_cd_filename = TRUE;
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125 | outs->s_isreg = TRUE;
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126 | outs->fopened = FALSE;
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127 | outs->stream = NULL;
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128 | hdrcbdata->honor_cd_filename = FALSE;
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129 | break;
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130 | }
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131 | return failure;
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132 | }
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133 | }
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134 |
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135 | return cb;
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136 | }
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137 |
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138 | /*
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139 | * Copies a file name part and returns an ALLOCATED data buffer.
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140 | */
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141 | static char *parse_filename(const char *ptr, size_t len)
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142 | {
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143 | char *copy;
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144 | char *p;
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145 | char *q;
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146 | char stop = '\0';
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147 |
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148 | /* simple implementation of strndup() */
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149 | copy = malloc(len + 1);
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150 | if(!copy)
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151 | return NULL;
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152 | memcpy(copy, ptr, len);
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153 | copy[len] = '\0';
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154 |
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155 | p = copy;
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156 | if(*p == '\'' || *p == '"') {
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157 | /* store the starting quote */
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158 | stop = *p;
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159 | p++;
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160 | }
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161 | else
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162 | stop = ';';
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163 |
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164 | /* scan for the end letter and stop there */
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165 | q = strchr(p, stop);
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166 | if(q)
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167 | *q = '\0';
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168 |
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169 | /* if the filename contains a path, only use filename portion */
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170 | q = strrchr(p, '/');
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171 | if(q) {
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172 | p = q + 1;
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173 | if(!*p) {
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174 | Curl_safefree(copy);
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175 | return NULL;
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176 | }
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177 | }
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178 |
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179 | /* If the filename contains a backslash, only use filename portion. The idea
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180 | is that even systems that don't handle backslashes as path separators
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181 | probably want the path removed for convenience. */
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182 | q = strrchr(p, '\\');
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183 | if(q) {
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184 | p = q + 1;
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185 | if(!*p) {
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186 | Curl_safefree(copy);
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187 | return NULL;
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188 | }
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189 | }
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190 |
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191 | /* make sure the file name doesn't end in \r or \n */
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192 | q = strchr(p, '\r');
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193 | if(q)
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194 | *q = '\0';
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195 |
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196 | q = strchr(p, '\n');
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197 | if(q)
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198 | *q = '\0';
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199 |
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200 | if(copy != p)
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201 | memmove(copy, p, strlen(p) + 1);
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202 |
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203 | #if defined(MSDOS) || defined(WIN32)
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204 | {
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205 | char *sanitized;
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206 | SANITIZEcode sc = sanitize_file_name(&sanitized, copy, 0);
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207 | Curl_safefree(copy);
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208 | if(sc)
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209 | return NULL;
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210 | copy = sanitized;
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211 | }
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212 | #endif /* MSDOS || WIN32 */
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213 |
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214 | /* in case we built debug enabled, we allow an environment variable
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215 | * named CURL_TESTDIR to prefix the given file name to put it into a
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216 | * specific directory
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217 | */
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218 | #ifdef DEBUGBUILD
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219 | {
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220 | char *tdir = curlx_getenv("CURL_TESTDIR");
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221 | if(tdir) {
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222 | char buffer[512]; /* suitably large */
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223 | snprintf(buffer, sizeof(buffer), "%s/%s", tdir, copy);
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224 | Curl_safefree(copy);
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225 | copy = strdup(buffer); /* clone the buffer, we don't use the libcurl
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226 | aprintf() or similar since we want to use the
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227 | same memory code as the "real" parse_filename
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228 | function */
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229 | curl_free(tdir);
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230 | }
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231 | }
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232 | #endif
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233 |
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234 | return copy;
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235 | }
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236 |
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