1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 /* <DESC>
25 * multi interface and debug callback
26 * </DESC>
27 */
28
29 #include <stdio.h>
30 #include <string.h>
31
32 /* somewhat unix-specific */
33 #include <sys/time.h>
34 #include <unistd.h>
35
36 /* curl stuff */
37 #include <curl/curl.h>
38
39 typedef char bool;
40 #define TRUE 1
41
42 static
dump(const char * text,FILE * stream,unsigned char * ptr,size_t size,bool nohex)43 void dump(const char *text,
44 FILE *stream, unsigned char *ptr, size_t size,
45 bool nohex)
46 {
47 size_t i;
48 size_t c;
49
50 unsigned int width = 0x10;
51
52 if(nohex)
53 /* without the hex output, we can fit more on screen */
54 width = 0x40;
55
56 fprintf(stream, "%s, %10.10lu bytes (0x%8.8lx)\n",
57 text, (unsigned long)size, (unsigned long)size);
58
59 for(i = 0; i<size; i += width) {
60
61 fprintf(stream, "%4.4lx: ", (unsigned long)i);
62
63 if(!nohex) {
64 /* hex not disabled, show it */
65 for(c = 0; c < width; c++)
66 if(i + c < size)
67 fprintf(stream, "%02x ", ptr[i + c]);
68 else
69 fputs(" ", stream);
70 }
71
72 for(c = 0; (c < width) && (i + c < size); c++) {
73 /* check for 0D0A; if found, skip past and start a new line of output */
74 if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
75 ptr[i + c + 1] == 0x0A) {
76 i += (c + 2 - width);
77 break;
78 }
79 fprintf(stream, "%c",
80 (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
81 /* check again for 0D0A, to avoid an extra \n if it's at width */
82 if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
83 ptr[i + c + 2] == 0x0A) {
84 i += (c + 3 - width);
85 break;
86 }
87 }
88 fputc('\n', stream); /* newline */
89 }
90 fflush(stream);
91 }
92
93 static
my_trace(CURL * handle,curl_infotype type,unsigned char * data,size_t size,void * userp)94 int my_trace(CURL *handle, curl_infotype type,
95 unsigned char *data, size_t size,
96 void *userp)
97 {
98 const char *text;
99
100 (void)userp;
101 (void)handle; /* prevent compiler warning */
102
103 switch(type) {
104 case CURLINFO_TEXT:
105 fprintf(stderr, "== Info: %s", data);
106 /* FALLTHROUGH */
107 default: /* in case a new one is introduced to shock us */
108 return 0;
109
110 case CURLINFO_HEADER_OUT:
111 text = "=> Send header";
112 break;
113 case CURLINFO_DATA_OUT:
114 text = "=> Send data";
115 break;
116 case CURLINFO_HEADER_IN:
117 text = "<= Recv header";
118 break;
119 case CURLINFO_DATA_IN:
120 text = "<= Recv data";
121 break;
122 }
123
124 dump(text, stderr, data, size, TRUE);
125 return 0;
126 }
127
128 /*
129 * Simply download an HTTP file.
130 */
main(void)131 int main(void)
132 {
133 CURL *http_handle;
134 CURLM *multi_handle;
135
136 int still_running = 0; /* keep number of running handles */
137
138 http_handle = curl_easy_init();
139
140 /* set the options (I left out a few, you will get the point anyway) */
141 curl_easy_setopt(http_handle, CURLOPT_URL, "https://www.example.com/");
142
143 curl_easy_setopt(http_handle, CURLOPT_DEBUGFUNCTION, my_trace);
144 curl_easy_setopt(http_handle, CURLOPT_VERBOSE, 1L);
145
146 /* init a multi stack */
147 multi_handle = curl_multi_init();
148
149 /* add the individual transfers */
150 curl_multi_add_handle(multi_handle, http_handle);
151
152 do {
153 CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
154
155 if(still_running)
156 /* wait for activity, timeout or "nothing" */
157 mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
158
159 if(mc)
160 break;
161
162 } while(still_running);
163
164 curl_multi_cleanup(multi_handle);
165
166 curl_easy_cleanup(http_handle);
167
168 return 0;
169 }
170