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