1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2017, 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 &&
73 ptr[i + c + 1] == 0x0A) {
78 (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
79 /* check again for 0D0A, to avoid an extra \n if it's at width */
80 if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
81 ptr[i + c + 2] == 0x0A) {
86 fputc('\n', stderr); /* newline */
91 int my_trace(CURL *handle, curl_infotype type,
92 char *data, size_t size,
96 (void)handle; /* prevent compiler warning */
100 fprintf(stderr, "== Info: %s", data);
102 default: /* in case a new one is introduced to shock us */
105 case CURLINFO_HEADER_OUT:
106 text = "=> Send header";
108 case CURLINFO_DATA_OUT:
109 text = "=> Send data";
111 case CURLINFO_SSL_DATA_OUT:
112 text = "=> Send SSL data";
114 case CURLINFO_HEADER_IN:
115 text = "<= Recv header";
117 case CURLINFO_DATA_IN:
118 text = "<= Recv data";
120 case CURLINFO_SSL_DATA_IN:
121 text = "<= Recv SSL data";
125 dump(text, (unsigned char *)data, size, 1);
129 #define OUTPUTFILE "dl"
131 static void setup(CURL *hnd)
133 FILE *out = fopen(OUTPUTFILE, "wb");
135 /* write to this file */
136 curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out);
138 /* set the same URL */
139 curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
141 /* please be verbose */
142 curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
143 curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
146 curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
148 /* we use a self-signed test server, skip verification during debugging */
149 curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
150 curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
152 #if (CURLPIPE_MULTIPLEX > 0)
153 /* wait for pipe connection to confirm */
154 curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
159 /* called when there's an incoming push */
160 static int server_push_callback(CURL *parent,
163 struct curl_pushheaders *headers,
168 int *transfers = (int *)userp;
171 static unsigned int count = 0;
173 (void)parent; /* we have no use for this */
175 snprintf(filename, 128, "push%u", count++);
177 /* here's a new stream, save it in a new file for each new push */
178 out = fopen(filename, "wb");
180 /* write to this file */
181 curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);
183 fprintf(stderr, "**** push callback approves stream %u, got %d headers!\n",
184 count, (int)num_headers);
186 for(i = 0; i<num_headers; i++) {
187 headp = curl_pushheader_bynum(headers, i);
188 fprintf(stderr, "**** header %u: %s\n", (int)i, headp);
191 headp = curl_pushheader_byname(headers, ":path");
193 fprintf(stderr, "**** The PATH is %s\n", headp /* skip :path + colon */);
196 (*transfers)++; /* one more */
202 * Download a file over HTTP/2, take care of server push.
208 int still_running; /* keep number of running handles */
209 int transfers = 1; /* we start with one */
212 /* init a multi stack */
213 multi_handle = curl_multi_init();
215 easy = curl_easy_init();
220 /* add the easy transfer */
221 curl_multi_add_handle(multi_handle, easy);
223 curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
224 curl_multi_setopt(multi_handle, CURLMOPT_PUSHFUNCTION, server_push_callback);
225 curl_multi_setopt(multi_handle, CURLMOPT_PUSHDATA, &transfers);
227 /* we start some action by calling perform right away */
228 curl_multi_perform(multi_handle, &still_running);
231 struct timeval timeout;
232 int rc; /* select() return code */
233 CURLMcode mc; /* curl_multi_fdset() return code */
240 long curl_timeo = -1;
246 /* set a suitable timeout to play around with */
250 curl_multi_timeout(multi_handle, &curl_timeo);
251 if(curl_timeo >= 0) {
252 timeout.tv_sec = curl_timeo / 1000;
253 if(timeout.tv_sec > 1)
256 timeout.tv_usec = (curl_timeo % 1000) * 1000;
259 /* get file descriptors from the transfers */
260 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
263 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
267 /* On success the value of maxfd is guaranteed to be >= -1. We call
268 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
269 no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
270 to sleep 100ms, which is the minimum suggested value in the
271 curl_multi_fdset() doc. */
278 /* Portable sleep for platforms other than Windows. */
279 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
280 rc = select(0, NULL, NULL, NULL, &wait);
284 /* Note that on some platforms 'timeout' may be modified by select().
285 If you need access to the original value save a copy beforehand. */
286 rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
295 /* timeout or readable/writable sockets */
296 curl_multi_perform(multi_handle, &still_running);
301 * A little caution when doing server push is that libcurl itself has
302 * created and added one or more easy handles but we need to clean them up
308 m = curl_multi_info_read(multi_handle, &msgq);
309 if(m && (m->msg == CURLMSG_DONE)) {
310 CURL *e = m->easy_handle;
312 curl_multi_remove_handle(multi_handle, e);
313 curl_easy_cleanup(e);
317 } while(transfers); /* as long as we have transfers going */
319 curl_multi_cleanup(multi_handle);