1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel (at) 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 static void *curl_hnd[NUM_HANDLES]; 47 static int num_transfers; 48 49 /* a handle to number lookup, highly ineffective when we do many 50 transfers... */ 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 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 && 93 ptr[i + c + 1] == 0x0A) { 94 i += (c + 2 - width); 95 break; 96 } 97 fprintf(stderr, "%c", 98 (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.'); 99 /* check again for 0D0A, to avoid an extra \n if it's at width */ 100 if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D && 101 ptr[i + c + 2] == 0x0A) { 102 i += (c + 3 - width); 103 break; 104 } 105 } 106 fputc('\n', stderr); /* newline */ 107 } 108 } 109 110 static 111 int my_trace(CURL *handle, curl_infotype type, 112 char *data, size_t size, 113 void *userp) 114 { 115 const char *text; 116 int num = hnd2num(handle); 117 (void)handle; /* prevent compiler warning */ 118 (void)userp; 119 switch(type) { 120 case CURLINFO_TEXT: 121 fprintf(stderr, "== %d Info: %s", num, data); 122 /* FALLTHROUGH */ 123 default: /* in case a new one is introduced to shock us */ 124 return 0; 125 126 case CURLINFO_HEADER_OUT: 127 text = "=> Send header"; 128 break; 129 case CURLINFO_DATA_OUT: 130 text = "=> Send data"; 131 break; 132 case CURLINFO_SSL_DATA_OUT: 133 text = "=> Send SSL data"; 134 break; 135 case CURLINFO_HEADER_IN: 136 text = "<= Recv header"; 137 break; 138 case CURLINFO_DATA_IN: 139 text = "<= Recv data"; 140 break; 141 case CURLINFO_SSL_DATA_IN: 142 text = "<= Recv SSL data"; 143 break; 144 } 145 146 dump(text, num, (unsigned char *)data, size, 1); 147 return 0; 148 } 149 150 static void setup(CURL *hnd, int num) 151 { 152 FILE *out; 153 char filename[128]; 154 155 snprintf(filename, 128, "dl-%d", num); 156 157 out = fopen(filename, "wb"); 158 159 /* write to this file */ 160 curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out); 161 162 /* set the same URL */ 163 curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html"); 164 165 /* please be verbose */ 166 curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); 167 curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace); 168 169 /* HTTP/2 please */ 170 curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0); 171 172 /* we use a self-signed test server, skip verification during debugging */ 173 curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L); 174 curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L); 175 176 #if (CURLPIPE_MULTIPLEX > 0) 177 /* wait for pipe connection to confirm */ 178 curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L); 179 #endif 180 181 curl_hnd[num] = hnd; 182 } 183 184 /* 185 * Simply download two files over HTTP/2, using the same physical connection! 186 */ 187 int main(int argc, char **argv) 188 { 189 CURL *easy[NUM_HANDLES]; 190 CURLM *multi_handle; 191 int i; 192 int still_running; /* keep number of running handles */ 193 194 if(argc > 1) 195 /* if given a number, do that many transfers */ 196 num_transfers = atoi(argv[1]); 197 198 if(!num_transfers || (num_transfers > NUM_HANDLES)) 199 num_transfers = 3; /* a suitable low default */ 200 201 /* init a multi stack */ 202 multi_handle = curl_multi_init(); 203 204 for(i = 0; i<num_transfers; i++) { 205 easy[i] = curl_easy_init(); 206 /* set options */ 207 setup(easy[i], i); 208 209 /* add the individual transfer */ 210 curl_multi_add_handle(multi_handle, easy[i]); 211 } 212 213 curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX); 214 215 /* we start some action by calling perform right away */ 216 curl_multi_perform(multi_handle, &still_running); 217 218 do { 219 struct timeval timeout; 220 int rc; /* select() return code */ 221 CURLMcode mc; /* curl_multi_fdset() return code */ 222 223 fd_set fdread; 224 fd_set fdwrite; 225 fd_set fdexcep; 226 int maxfd = -1; 227 228 long curl_timeo = -1; 229 230 FD_ZERO(&fdread); 231 FD_ZERO(&fdwrite); 232 FD_ZERO(&fdexcep); 233 234 /* set a suitable timeout to play around with */ 235 timeout.tv_sec = 1; 236 timeout.tv_usec = 0; 237 238 curl_multi_timeout(multi_handle, &curl_timeo); 239 if(curl_timeo >= 0) { 240 timeout.tv_sec = curl_timeo / 1000; 241 if(timeout.tv_sec > 1) 242 timeout.tv_sec = 1; 243 else 244 timeout.tv_usec = (curl_timeo % 1000) * 1000; 245 } 246 247 /* get file descriptors from the transfers */ 248 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); 249 250 if(mc != CURLM_OK) { 251 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); 252 break; 253 } 254 255 /* On success the value of maxfd is guaranteed to be >= -1. We call 256 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are 257 no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- 258 to sleep 100ms, which is the minimum suggested value in the 259 curl_multi_fdset() doc. */ 260 261 if(maxfd == -1) { 262 #ifdef _WIN32 263 Sleep(100); 264 rc = 0; 265 #else 266 /* Portable sleep for platforms other than Windows. */ 267 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ 268 rc = select(0, NULL, NULL, NULL, &wait); 269 #endif 270 } 271 else { 272 /* Note that on some platforms 'timeout' may be modified by select(). 273 If you need access to the original value save a copy beforehand. */ 274 rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout); 275 } 276 277 switch(rc) { 278 case -1: 279 /* select error */ 280 break; 281 case 0: 282 default: 283 /* timeout or readable/writable sockets */ 284 curl_multi_perform(multi_handle, &still_running); 285 break; 286 } 287 } while(still_running); 288 289 curl_multi_cleanup(multi_handle); 290 291 for(i = 0; i<num_transfers; i++) 292 curl_easy_cleanup(easy[i]); 293 294 return 0; 295 } 296
