1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2011, 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 http://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#include <stdio.h>
23#include <curl/curl.h>
24
25struct data {
26  char trace_ascii; /* 1 or 0 */
27};
28
29static
30void dump(const char *text,
31          FILE *stream, unsigned char *ptr, size_t size,
32          char nohex)
33{
34  size_t i;
35  size_t c;
36
37  unsigned int width=0x10;
38
39  if(nohex)
40    /* without the hex output, we can fit more on screen */
41    width = 0x40;
42
43  fprintf(stream, "%s, %10.10ld bytes (0x%8.8lx)\n",
44          text, (long)size, (long)size);
45
46  for(i=0; i<size; i+= width) {
47
48    fprintf(stream, "%4.4lx: ", (long)i);
49
50    if(!nohex) {
51      /* hex not disabled, show it */
52      for(c = 0; c < width; c++)
53        if(i+c < size)
54          fprintf(stream, "%02x ", ptr[i+c]);
55        else
56          fputs("   ", stream);
57    }
58
59    for(c = 0; (c < width) && (i+c < size); c++) {
60      /* check for 0D0A; if found, skip past and start a new line of output */
61      if (nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) {
62        i+=(c+2-width);
63        break;
64      }
65      fprintf(stream, "%c",
66              (ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.');
67      /* check again for 0D0A, to avoid an extra \n if it's at width */
68      if (nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) {
69        i+=(c+3-width);
70        break;
71      }
72    }
73    fputc('\n', stream); /* newline */
74  }
75  fflush(stream);
76}
77
78static
79int my_trace(CURL *handle, curl_infotype type,
80             char *data, size_t size,
81             void *userp)
82{
83  struct data *config = (struct data *)userp;
84  const char *text;
85  (void)handle; /* prevent compiler warning */
86
87  switch (type) {
88  case CURLINFO_TEXT:
89    fprintf(stderr, "== Info: %s", data);
90  default: /* in case a new one is introduced to shock us */
91    return 0;
92
93  case CURLINFO_HEADER_OUT:
94    text = "=> Send header";
95    break;
96  case CURLINFO_DATA_OUT:
97    text = "=> Send data";
98    break;
99  case CURLINFO_SSL_DATA_OUT:
100    text = "=> Send SSL data";
101    break;
102  case CURLINFO_HEADER_IN:
103    text = "<= Recv header";
104    break;
105  case CURLINFO_DATA_IN:
106    text = "<= Recv data";
107    break;
108  case CURLINFO_SSL_DATA_IN:
109    text = "<= Recv SSL data";
110    break;
111  }
112
113  dump(text, stderr, (unsigned char *)data, size, config->trace_ascii);
114  return 0;
115}
116
117int main(void)
118{
119  CURL *curl;
120  CURLcode res;
121  struct data config;
122
123  config.trace_ascii = 1; /* enable ascii tracing */
124
125  curl = curl_easy_init();
126  if(curl) {
127    curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace);
128    curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &config);
129
130    /* the DEBUGFUNCTION has no effect until we enable VERBOSE */
131    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
132
133    curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/");
134    res = curl_easy_perform(curl);
135
136    /* always cleanup */
137    curl_easy_cleanup(curl);
138  }
139  return 0;
140}
141