1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2016, 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 void *curl_hnd[NUM_HANDLES]; 47 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 && 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 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 } 146 147 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 */ 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
