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 * Multiplexed HTTP/2 downloads over a single connection
24 * </DESC>
25 */
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29
30 /* somewhat unix-specific */
31 #include <sys/time.h>
32 #include <unistd.h>
33
34 /* curl stuff */
35 #include <curl/curl.h>
36
37 #ifndef CURLPIPE_MULTIPLEX
38 /* This little trick will just make sure that we don't enable pipelining for
39 libcurls old enough to not have this symbol. It is _not_ defined to zero in
40 a recent libcurl header. */
41 #define CURLPIPE_MULTIPLEX 0
42 #endif
43
44 #define NUM_HANDLES 1000
45
46 void *curl_hnd[NUM_HANDLES];
47 int num_transfers;
48
49 /* a handle to number lookup, highly ineffective when we do many
50 transfers... */
hnd2num(CURL * hnd)51 static int hnd2num(CURL *hnd)
52 {
53 int i;
54 for(i=0; i< num_transfers; i++) {
55 if(curl_hnd[i] == hnd)
56 return i;
57 }
58 return 0; /* weird, but just a fail-safe */
59 }
60
61 static
dump(const char * text,int num,unsigned char * ptr,size_t size,char nohex)62 void dump(const char *text, int num, unsigned char *ptr, size_t size,
63 char nohex)
64 {
65 size_t i;
66 size_t c;
67
68 unsigned int width=0x10;
69
70 if(nohex)
71 /* without the hex output, we can fit more on screen */
72 width = 0x40;
73
74 fprintf(stderr, "%d %s, %ld bytes (0x%lx)\n",
75 num, text, (long)size, (long)size);
76
77 for(i=0; i<size; i+= width) {
78
79 fprintf(stderr, "%4.4lx: ", (long)i);
80
81 if(!nohex) {
82 /* hex not disabled, show it */
83 for(c = 0; c < width; c++)
84 if(i+c < size)
85 fprintf(stderr, "%02x ", ptr[i+c]);
86 else
87 fputs(" ", stderr);
88 }
89
90 for(c = 0; (c < width) && (i+c < size); c++) {
91 /* check for 0D0A; if found, skip past and start a new line of output */
92 if(nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) {
93 i+=(c+2-width);
94 break;
95 }
96 fprintf(stderr, "%c",
97 (ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.');
98 /* check again for 0D0A, to avoid an extra \n if it's at width */
99 if(nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) {
100 i+=(c+3-width);
101 break;
102 }
103 }
104 fputc('\n', stderr); /* newline */
105 }
106 }
107
108 static
my_trace(CURL * handle,curl_infotype type,char * data,size_t size,void * userp)109 int my_trace(CURL *handle, curl_infotype type,
110 char *data, size_t size,
111 void *userp)
112 {
113 const char *text;
114 int num = hnd2num(handle);
115 (void)handle; /* prevent compiler warning */
116 (void)userp;
117 switch (type) {
118 case CURLINFO_TEXT:
119 fprintf(stderr, "== %d Info: %s", num, data);
120 default: /* in case a new one is introduced to shock us */
121 return 0;
122
123 case CURLINFO_HEADER_OUT:
124 text = "=> Send header";
125 break;
126 case CURLINFO_DATA_OUT:
127 text = "=> Send data";
128 break;
129 case CURLINFO_SSL_DATA_OUT:
130 text = "=> Send SSL data";
131 break;
132 case CURLINFO_HEADER_IN:
133 text = "<= Recv header";
134 break;
135 case CURLINFO_DATA_IN:
136 text = "<= Recv data";
137 break;
138 case CURLINFO_SSL_DATA_IN:
139 text = "<= Recv SSL data";
140 break;
141 }
142
143 dump(text, num, (unsigned char *)data, size, 1);
144 return 0;
145 }
146
setup(CURL * hnd,int num)147 static void setup(CURL *hnd, int num)
148 {
149 FILE *out;
150 char filename[128];
151
152 snprintf(filename, 128, "dl-%d", num);
153
154 out = fopen(filename, "wb");
155
156 /* write to this file */
157 curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out);
158
159 /* set the same URL */
160 curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
161
162 /* send it verbose for max debuggaility */
163 curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
164 curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
165
166 /* HTTP/2 please */
167 curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
168
169 /* we use a self-signed test server, skip verification during debugging */
170 curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
171 curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
172
173 #if (CURLPIPE_MULTIPLEX > 0)
174 /* wait for pipe connection to confirm */
175 curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
176 #endif
177
178 curl_hnd[num] = hnd;
179 }
180
181 /*
182 * Simply download two files over HTTP/2, using the same physical connection!
183 */
main(int argc,char ** argv)184 int main(int argc, char **argv)
185 {
186 CURL *easy[NUM_HANDLES];
187 CURLM *multi_handle;
188 int i;
189 int still_running; /* keep number of running handles */
190
191 if(argc > 1)
192 /* if given a number, do that many transfers */
193 num_transfers = atoi(argv[1]);
194
195 if(!num_transfers || (num_transfers > NUM_HANDLES))
196 num_transfers = 3; /* a suitable low default */
197
198 /* init a multi stack */
199 multi_handle = curl_multi_init();
200
201 for(i=0; i<num_transfers; i++) {
202 easy[i] = curl_easy_init();
203 /* set options */
204 setup(easy[i], i);
205
206 /* add the individual transfer */
207 curl_multi_add_handle(multi_handle, easy[i]);
208 }
209
210 curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
211
212 /* we start some action by calling perform right away */
213 curl_multi_perform(multi_handle, &still_running);
214
215 do {
216 struct timeval timeout;
217 int rc; /* select() return code */
218 CURLMcode mc; /* curl_multi_fdset() return code */
219
220 fd_set fdread;
221 fd_set fdwrite;
222 fd_set fdexcep;
223 int maxfd = -1;
224
225 long curl_timeo = -1;
226
227 FD_ZERO(&fdread);
228 FD_ZERO(&fdwrite);
229 FD_ZERO(&fdexcep);
230
231 /* set a suitable timeout to play around with */
232 timeout.tv_sec = 1;
233 timeout.tv_usec = 0;
234
235 curl_multi_timeout(multi_handle, &curl_timeo);
236 if(curl_timeo >= 0) {
237 timeout.tv_sec = curl_timeo / 1000;
238 if(timeout.tv_sec > 1)
239 timeout.tv_sec = 1;
240 else
241 timeout.tv_usec = (curl_timeo % 1000) * 1000;
242 }
243
244 /* get file descriptors from the transfers */
245 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
246
247 if(mc != CURLM_OK) {
248 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
249 break;
250 }
251
252 /* On success the value of maxfd is guaranteed to be >= -1. We call
253 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
254 no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
255 to sleep 100ms, which is the minimum suggested value in the
256 curl_multi_fdset() doc. */
257
258 if(maxfd == -1) {
259 #ifdef _WIN32
260 Sleep(100);
261 rc = 0;
262 #else
263 /* Portable sleep for platforms other than Windows. */
264 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
265 rc = select(0, NULL, NULL, NULL, &wait);
266 #endif
267 }
268 else {
269 /* Note that on some platforms 'timeout' may be modified by select().
270 If you need access to the original value save a copy beforehand. */
271 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
272 }
273
274 switch(rc) {
275 case -1:
276 /* select error */
277 break;
278 case 0:
279 default:
280 /* timeout or readable/writable sockets */
281 curl_multi_perform(multi_handle, &still_running);
282 break;
283 }
284 } while(still_running);
285
286 curl_multi_cleanup(multi_handle);
287
288 for(i=0; i<num_transfers; i++)
289 curl_easy_cleanup(easy[i]);
290
291 return 0;
292 }
293