1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2016, 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
dump(const char * text,FILE * stream,unsigned char * ptr,size_t size,char nohex)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, %10.10ld bytes (0x%8.8lx)\n",
48 text, (long)size, (long)size);
49
50 for(i=0; i<size; i+= width) {
51
52 fprintf(stream, "%4.4lx: ", (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 && ptr[i+c+1]==0x0A) {
66 i+=(c+2-width);
67 break;
68 }
69 fprintf(stream, "%c",
70 (ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.');
71 /* check again for 0D0A, to avoid an extra \n if it's at width */
72 if(nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) {
73 i+=(c+3-width);
74 break;
75 }
76 }
77 fputc('\n', stream); /* newline */
78 }
79 fflush(stream);
80 }
81
82 static
my_trace(CURL * handle,curl_infotype type,char * data,size_t size,void * userp)83 int my_trace(CURL *handle, curl_infotype type,
84 char *data, size_t size,
85 void *userp)
86 {
87 struct data *config = (struct data *)userp;
88 const char *text;
89 (void)handle; /* prevent compiler warning */
90
91 switch (type) {
92 case CURLINFO_TEXT:
93 fprintf(stderr, "== Info: %s", data);
94 default: /* in case a new one is introduced to shock us */
95 return 0;
96
97 case CURLINFO_HEADER_OUT:
98 text = "=> Send header";
99 break;
100 case CURLINFO_DATA_OUT:
101 text = "=> Send data";
102 break;
103 case CURLINFO_SSL_DATA_OUT:
104 text = "=> Send SSL data";
105 break;
106 case CURLINFO_HEADER_IN:
107 text = "<= Recv header";
108 break;
109 case CURLINFO_DATA_IN:
110 text = "<= Recv data";
111 break;
112 case CURLINFO_SSL_DATA_IN:
113 text = "<= Recv SSL data";
114 break;
115 }
116
117 dump(text, stderr, (unsigned char *)data, size, config->trace_ascii);
118 return 0;
119 }
120
main(void)121 int main(void)
122 {
123 CURL *curl;
124 CURLcode res;
125 struct data config;
126
127 config.trace_ascii = 1; /* enable ascii tracing */
128
129 curl = curl_easy_init();
130 if(curl) {
131 curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace);
132 curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &config);
133
134 /* the DEBUGFUNCTION has no effect until we enable VERBOSE */
135 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
136
137 /* example.com is redirected, so we tell libcurl to follow redirection */
138 curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
139
140 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/");
141 res = curl_easy_perform(curl);
142 /* Check for errors */
143 if(res != CURLE_OK)
144 fprintf(stderr, "curl_easy_perform() failed: %s\n",
145 curl_easy_strerror(res));
146
147 /* always cleanup */
148 curl_easy_cleanup(curl);
149 }
150 return 0;
151 }
152