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curl

    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
    9:  *
   10:  * This software is licensed as described in the file COPYING, which
   11:  * you should have received as part of this distribution. The terms
   12:  * are also available at https://curl.haxx.se/docs/copyright.html.
   13:  *
   14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   15:  * copies of the Software, and permit persons to whom the Software is
   16:  * furnished to do so, under the terms of the COPYING file.
   17:  *
   18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   19:  * KIND, either express or implied.
   20:  *
   21:  ***************************************************************************/
   22: /* <DESC>
   23:  * Show how CURLOPT_DEBUGFUNCTION can be used.
   24:  * </DESC>
   25:  */
   26: #include <stdio.h>
   27: #include <curl/curl.h>
   28: 
   29: struct data {
   30:   char trace_ascii; /* 1 or 0 */
   31: };
   32: 
   33: static
   34: void dump(const char *text,
   35:           FILE *stream, unsigned char *ptr, size_t size,
   36:           char nohex)
   37: {
   38:   size_t i;
   39:   size_t c;
   40: 
   41:   unsigned int width = 0x10;
   42: 
   43:   if(nohex)
   44:     /* without the hex output, we can fit more on screen */
   45:     width = 0x40;
   46: 
   47:   fprintf(stream, "%s, %10.10lu bytes (0x%8.8lx)\n",
   48:           text, (unsigned long)size, (unsigned long)size);
   49: 
   50:   for(i = 0; i<size; i += width) {
   51: 
   52:     fprintf(stream, "%4.4lx: ", (unsigned long)i);
   53: 
   54:     if(!nohex) {
   55:       /* hex not disabled, show it */
   56:       for(c = 0; c < width; c++)
   57:         if(i + c < size)
   58:           fprintf(stream, "%02x ", ptr[i + c]);
   59:         else
   60:           fputs("   ", stream);
   61:     }
   62: 
   63:     for(c = 0; (c < width) && (i + c < size); c++) {
   64:       /* check for 0D0A; if found, skip past and start a new line of output */
   65:       if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
   66:          ptr[i + c + 1] == 0x0A) {
   67:         i += (c + 2 - width);
   68:         break;
   69:       }
   70:       fprintf(stream, "%c",
   71:               (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
   72:       /* check again for 0D0A, to avoid an extra \n if it's at width */
   73:       if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
   74:          ptr[i + c + 2] == 0x0A) {
   75:         i += (c + 3 - width);
   76:         break;
   77:       }
   78:     }
   79:     fputc('\n', stream); /* newline */
   80:   }
   81:   fflush(stream);
   82: }
   83: 
   84: static
   85: int my_trace(CURL *handle, curl_infotype type,
   86:              char *data, size_t size,
   87:              void *userp)
   88: {
   89:   struct data *config = (struct data *)userp;
   90:   const char *text;
   91:   (void)handle; /* prevent compiler warning */
   92: 
   93:   switch(type) {
   94:   case CURLINFO_TEXT:
   95:     fprintf(stderr, "== Info: %s", data);
   96:     /* FALLTHROUGH */
   97:   default: /* in case a new one is introduced to shock us */
   98:     return 0;
   99: 
  100:   case CURLINFO_HEADER_OUT:
  101:     text = "=> Send header";
  102:     break;
  103:   case CURLINFO_DATA_OUT:
  104:     text = "=> Send data";
  105:     break;
  106:   case CURLINFO_SSL_DATA_OUT:
  107:     text = "=> Send SSL data";
  108:     break;
  109:   case CURLINFO_HEADER_IN:
  110:     text = "<= Recv header";
  111:     break;
  112:   case CURLINFO_DATA_IN:
  113:     text = "<= Recv data";
  114:     break;
  115:   case CURLINFO_SSL_DATA_IN:
  116:     text = "<= Recv SSL data";
  117:     break;
  118:   }
  119: 
  120:   dump(text, stderr, (unsigned char *)data, size, config->trace_ascii);
  121:   return 0;
  122: }
  123: 
  124: int main(void)
  125: {
  126:   CURL *curl;
  127:   CURLcode res;
  128:   struct data config;
  129: 
  130:   config.trace_ascii = 1; /* enable ascii tracing */
  131: 
  132:   curl = curl_easy_init();
  133:   if(curl) {
  134:     curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace);
  135:     curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &config);
  136: 
  137:     /* the DEBUGFUNCTION has no effect until we enable VERBOSE */
  138:     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
  139: 
  140:     /* example.com is redirected, so we tell libcurl to follow redirection */
  141:     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
  142: 
  143:     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
  144:     res = curl_easy_perform(curl);
  145:     /* Check for errors */
  146:     if(res != CURLE_OK)
  147:       fprintf(stderr, "curl_easy_perform() failed: %s\n",
  148:               curl_easy_strerror(res));
  149: 
  150:     /* always cleanup */
  151:     curl_easy_cleanup(curl);
  152:   }
  153:   return 0;
  154: }