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
46void *curl_hnd[NUM_HANDLES];
47int num_transfers;
48
49/* a handle to number lookup, highly ineffective when we do many
50   transfers... */
51static 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
61static
62void 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
108static
109int 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
147static 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 */
184int 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