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 * Multiplexed HTTP/2 downloads over a single connection
26 * </DESC>
27 */
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <errno.h>
32
33 /* curl stuff */
34 #include <curl/curl.h>
35 #include <curl/mprintf.h>
36
37 #ifndef CURLPIPE_MULTIPLEX
38 /* This little trick makes sure that we do not enable pipelining for libcurls
39 old enough to not have this symbol. It is _not_ defined to zero in a recent
40 libcurl header. */
41 #define CURLPIPE_MULTIPLEX 0
42 #endif
43
44 struct transfer {
45 CURL *easy;
46 unsigned int num;
47 FILE *out;
48 };
49
50 #define NUM_HANDLES 1000
51
52 static
dump(const char * text,unsigned int num,unsigned char * ptr,size_t size,char nohex)53 void dump(const char *text, unsigned int num, unsigned char *ptr, size_t size,
54 char nohex)
55 {
56 size_t i;
57 size_t c;
58
59 unsigned int width = 0x10;
60
61 if(nohex)
62 /* without the hex output, we can fit more on screen */
63 width = 0x40;
64
65 fprintf(stderr, "%u %s, %lu bytes (0x%lx)\n",
66 num, text, (unsigned long)size, (unsigned long)size);
67
68 for(i = 0; i<size; i += width) {
69
70 fprintf(stderr, "%4.4lx: ", (unsigned long)i);
71
72 if(!nohex) {
73 /* hex not disabled, show it */
74 for(c = 0; c < width; c++)
75 if(i + c < size)
76 fprintf(stderr, "%02x ", ptr[i + c]);
77 else
78 fputs(" ", stderr);
79 }
80
81 for(c = 0; (c < width) && (i + c < size); c++) {
82 /* check for 0D0A; if found, skip past and start a new line of output */
83 if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
84 ptr[i + c + 1] == 0x0A) {
85 i += (c + 2 - width);
86 break;
87 }
88 fprintf(stderr, "%c",
89 (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
90 /* check again for 0D0A, to avoid an extra \n if it's at width */
91 if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
92 ptr[i + c + 2] == 0x0A) {
93 i += (c + 3 - width);
94 break;
95 }
96 }
97 fputc('\n', stderr); /* newline */
98 }
99 }
100
101 static
my_trace(CURL * handle,curl_infotype type,char * data,size_t size,void * userp)102 int my_trace(CURL *handle, curl_infotype type,
103 char *data, size_t size,
104 void *userp)
105 {
106 const char *text;
107 struct transfer *t = (struct transfer *)userp;
108 unsigned int num = t->num;
109 (void)handle; /* prevent compiler warning */
110
111 switch(type) {
112 case CURLINFO_TEXT:
113 fprintf(stderr, "== %u Info: %s", num, data);
114 return 0;
115 case CURLINFO_HEADER_OUT:
116 text = "=> Send header";
117 break;
118 case CURLINFO_DATA_OUT:
119 text = "=> Send data";
120 break;
121 case CURLINFO_SSL_DATA_OUT:
122 text = "=> Send SSL data";
123 break;
124 case CURLINFO_HEADER_IN:
125 text = "<= Recv header";
126 break;
127 case CURLINFO_DATA_IN:
128 text = "<= Recv data";
129 break;
130 case CURLINFO_SSL_DATA_IN:
131 text = "<= Recv SSL data";
132 break;
133 default: /* in case a new one is introduced to shock us */
134 return 0;
135 }
136
137 dump(text, num, (unsigned char *)data, size, 1);
138 return 0;
139 }
140
setup(struct transfer * t,int num)141 static void setup(struct transfer *t, int num)
142 {
143 char filename[128];
144 CURL *hnd;
145
146 hnd = t->easy = curl_easy_init();
147
148 curl_msnprintf(filename, 128, "dl-%d", num);
149
150 t->out = fopen(filename, "wb");
151 if(!t->out) {
152 fprintf(stderr, "error: could not open file %s for writing: %s\n",
153 filename, strerror(errno));
154 exit(1);
155 }
156
157 /* write to this file */
158 curl_easy_setopt(hnd, CURLOPT_WRITEDATA, t->out);
159
160 /* set the same URL */
161 curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
162
163 /* please be verbose */
164 curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
165 curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
166 curl_easy_setopt(hnd, CURLOPT_DEBUGDATA, t);
167
168 /* enlarge the receive buffer for potentially higher transfer speeds */
169 curl_easy_setopt(hnd, CURLOPT_BUFFERSIZE, 100000L);
170
171 /* HTTP/2 please */
172 curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
173
174 #if (CURLPIPE_MULTIPLEX > 0)
175 /* wait for pipe connection to confirm */
176 curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
177 #endif
178 }
179
180 /*
181 * Download many transfers over HTTP/2, using the same connection!
182 */
main(int argc,char ** argv)183 int main(int argc, char **argv)
184 {
185 struct transfer trans[NUM_HANDLES];
186 CURLM *multi_handle;
187 int i;
188 int still_running = 0; /* keep number of running handles */
189 int num_transfers;
190 if(argc > 1) {
191 /* if given a number, do that many transfers */
192 num_transfers = atoi(argv[1]);
193 if((num_transfers < 1) || (num_transfers > NUM_HANDLES))
194 num_transfers = 3; /* a suitable low default */
195 }
196 else
197 num_transfers = 3; /* suitable default */
198
199 /* init a multi stack */
200 multi_handle = curl_multi_init();
201
202 for(i = 0; i < num_transfers; i++) {
203 setup(&trans[i], i);
204
205 /* add the individual transfer */
206 curl_multi_add_handle(multi_handle, trans[i].easy);
207 }
208
209 curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
210
211 do {
212 CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
213
214 if(still_running)
215 /* wait for activity, timeout or "nothing" */
216 mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
217
218 if(mc)
219 break;
220 } while(still_running);
221
222 for(i = 0; i < num_transfers; i++) {
223 curl_multi_remove_handle(multi_handle, trans[i].easy);
224 curl_easy_cleanup(trans[i].easy);
225 }
226
227 curl_multi_cleanup(multi_handle);
228
229 return 0;
230 }
231
