1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
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.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
30 /* somewhat unix-specific */
35 #include <curl/curl.h>
37 #ifndef CURLPIPE_MULTIPLEX
38 #error "too old libcurl, can't do HTTP/2 server push!"
42 void dump(const char *text, unsigned char *ptr, size_t size,
48 unsigned int width=0x10;
51 /* without the hex output, we can fit more on screen */
54 fprintf(stderr, "%s, %ld bytes (0x%lx)\n",
55 text, (long)size, (long)size);
57 for(i=0; i<size; i+= width) {
59 fprintf(stderr, "%4.4lx: ", (long)i);
62 /* hex not disabled, show it */
63 for(c = 0; c < width; c++)
65 fprintf(stderr, "%02x ", ptr[i+c]);
70 for(c = 0; (c < width) && (i+c < size); c++) {
71 /* check for 0D0A; if found, skip past and start a new line of output */
72 if(nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) {
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 && ptr[i+c+2]==0x0A) {
84 fputc('\n', stderr); /* newline */
89 int my_trace(CURL *handle, curl_infotype type,
90 char *data, size_t size,
94 (void)handle; /* prevent compiler warning */
98 fprintf(stderr, "== Info: %s", data);
99 default: /* in case a new one is introduced to shock us */
102 case CURLINFO_HEADER_OUT:
103 text = "=> Send header";
105 case CURLINFO_DATA_OUT:
106 text = "=> Send data";
108 case CURLINFO_SSL_DATA_OUT:
109 text = "=> Send SSL data";
111 case CURLINFO_HEADER_IN:
112 text = "<= Recv header";
114 case CURLINFO_DATA_IN:
115 text = "<= Recv data";
117 case CURLINFO_SSL_DATA_IN:
118 text = "<= Recv SSL data";
122 dump(text, (unsigned char *)data, size, 1);
126 #define OUTPUTFILE "dl"
128 static void setup(CURL *hnd)
130 FILE *out = fopen(OUTPUTFILE, "wb");
132 /* write to this file */
133 curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out);
135 /* set the same URL */
136 curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
138 /* send it verbose for max debuggaility */
139 curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
140 curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
143 curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
145 /* we use a self-signed test server, skip verification during debugging */
146 curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
147 curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
149 #if (CURLPIPE_MULTIPLEX > 0)
150 /* wait for pipe connection to confirm */
151 curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
156 /* called when there's an incoming push */
157 static int server_push_callback(CURL *parent,
160 struct curl_pushheaders *headers,
165 int *transfers = (int *)userp;
168 static unsigned int count = 0;
170 (void)parent; /* we have no use for this */
172 snprintf(filename, 128, "push%u", count++);
174 /* here's a new stream, save it in a new file for each new push */
175 out = fopen(filename, "wb");
177 /* write to this file */
178 curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);
180 fprintf(stderr, "**** push callback approves stream %u, got %d headers!\n",
181 count, (int)num_headers);
183 for(i=0; i<num_headers; i++) {
184 headp = curl_pushheader_bynum(headers, i);
185 fprintf(stderr, "**** header %u: %s\n", (int)i, headp);
188 headp = curl_pushheader_byname(headers, ":path");
190 fprintf(stderr, "**** The PATH is %s\n", headp /* skip :path + colon */ );
193 (*transfers)++; /* one more */
199 * Download a file over HTTP/2, take care of server push.
205 int still_running; /* keep number of running handles */
206 int transfers=1; /* we start with one */
209 /* init a multi stack */
210 multi_handle = curl_multi_init();
212 easy = curl_easy_init();
217 /* add the easy transfer */
218 curl_multi_add_handle(multi_handle, easy);
220 curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
221 curl_multi_setopt(multi_handle, CURLMOPT_PUSHFUNCTION, server_push_callback);
222 curl_multi_setopt(multi_handle, CURLMOPT_PUSHDATA, &transfers);
224 /* we start some action by calling perform right away */
225 curl_multi_perform(multi_handle, &still_running);
228 struct timeval timeout;
229 int rc; /* select() return code */
230 CURLMcode mc; /* curl_multi_fdset() return code */
237 long curl_timeo = -1;
243 /* set a suitable timeout to play around with */
247 curl_multi_timeout(multi_handle, &curl_timeo);
248 if(curl_timeo >= 0) {
249 timeout.tv_sec = curl_timeo / 1000;
250 if(timeout.tv_sec > 1)
253 timeout.tv_usec = (curl_timeo % 1000) * 1000;
256 /* get file descriptors from the transfers */
257 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
260 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
264 /* On success the value of maxfd is guaranteed to be >= -1. We call
265 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
266 no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
267 to sleep 100ms, which is the minimum suggested value in the
268 curl_multi_fdset() doc. */
275 /* Portable sleep for platforms other than Windows. */
276 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
277 rc = select(0, NULL, NULL, NULL, &wait);
281 /* Note that on some platforms 'timeout' may be modified by select().
282 If you need access to the original value save a copy beforehand. */
283 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
292 /* timeout or readable/writable sockets */
293 curl_multi_perform(multi_handle, &still_running);
298 * A little caution when doing server push is that libcurl itself has
299 * created and added one or more easy handles but we need to clean them up
305 m = curl_multi_info_read(multi_handle, &msgq);
306 if(m && (m->msg == CURLMSG_DONE)) {
307 CURL *e = m->easy_handle;
309 curl_multi_remove_handle(multi_handle, e);
310 curl_easy_cleanup(e);
314 } while(transfers); /* as long as we have transfers going */
316 curl_multi_cleanup(multi_handle);