Annotation of embedaddon/curl/docs/examples/http2-serverpush.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2019, 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: * HTTP/2 server push
! 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: #error "too old libcurl, can't do HTTP/2 server push!"
! 39: #endif
! 40:
! 41: static
! 42: void dump(const char *text, unsigned char *ptr, size_t size,
! 43: char nohex)
! 44: {
! 45: size_t i;
! 46: size_t c;
! 47:
! 48: unsigned int width = 0x10;
! 49:
! 50: if(nohex)
! 51: /* without the hex output, we can fit more on screen */
! 52: width = 0x40;
! 53:
! 54: fprintf(stderr, "%s, %lu bytes (0x%lx)\n",
! 55: text, (unsigned long)size, (unsigned long)size);
! 56:
! 57: for(i = 0; i<size; i += width) {
! 58:
! 59: fprintf(stderr, "%4.4lx: ", (unsigned long)i);
! 60:
! 61: if(!nohex) {
! 62: /* hex not disabled, show it */
! 63: for(c = 0; c < width; c++)
! 64: if(i + c < size)
! 65: fprintf(stderr, "%02x ", ptr[i + c]);
! 66: else
! 67: fputs(" ", stderr);
! 68: }
! 69:
! 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) {
! 74: i += (c + 2 - width);
! 75: break;
! 76: }
! 77: fprintf(stderr, "%c",
! 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) {
! 82: i += (c + 3 - width);
! 83: break;
! 84: }
! 85: }
! 86: fputc('\n', stderr); /* newline */
! 87: }
! 88: }
! 89:
! 90: static
! 91: int my_trace(CURL *handle, curl_infotype type,
! 92: char *data, size_t size,
! 93: void *userp)
! 94: {
! 95: const char *text;
! 96: (void)handle; /* prevent compiler warning */
! 97: (void)userp;
! 98: switch(type) {
! 99: case CURLINFO_TEXT:
! 100: fprintf(stderr, "== Info: %s", data);
! 101: /* FALLTHROUGH */
! 102: default: /* in case a new one is introduced to shock us */
! 103: return 0;
! 104:
! 105: case CURLINFO_HEADER_OUT:
! 106: text = "=> Send header";
! 107: break;
! 108: case CURLINFO_DATA_OUT:
! 109: text = "=> Send data";
! 110: break;
! 111: case CURLINFO_SSL_DATA_OUT:
! 112: text = "=> Send SSL data";
! 113: break;
! 114: case CURLINFO_HEADER_IN:
! 115: text = "<= Recv header";
! 116: break;
! 117: case CURLINFO_DATA_IN:
! 118: text = "<= Recv data";
! 119: break;
! 120: case CURLINFO_SSL_DATA_IN:
! 121: text = "<= Recv SSL data";
! 122: break;
! 123: }
! 124:
! 125: dump(text, (unsigned char *)data, size, 1);
! 126: return 0;
! 127: }
! 128:
! 129: #define OUTPUTFILE "dl"
! 130:
! 131: static int setup(CURL *hnd)
! 132: {
! 133: FILE *out = fopen(OUTPUTFILE, "wb");
! 134: if(!out)
! 135: /* failed */
! 136: return 1;
! 137:
! 138: /* write to this file */
! 139: curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out);
! 140:
! 141: /* set the same URL */
! 142: curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
! 143:
! 144: /* please be verbose */
! 145: curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
! 146: curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
! 147:
! 148: /* HTTP/2 please */
! 149: curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
! 150:
! 151: /* we use a self-signed test server, skip verification during debugging */
! 152: curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
! 153: curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
! 154:
! 155: #if (CURLPIPE_MULTIPLEX > 0)
! 156: /* wait for pipe connection to confirm */
! 157: curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
! 158: #endif
! 159: return 0; /* all is good */
! 160: }
! 161:
! 162: /* called when there's an incoming push */
! 163: static int server_push_callback(CURL *parent,
! 164: CURL *easy,
! 165: size_t num_headers,
! 166: struct curl_pushheaders *headers,
! 167: void *userp)
! 168: {
! 169: char *headp;
! 170: size_t i;
! 171: int *transfers = (int *)userp;
! 172: char filename[128];
! 173: FILE *out;
! 174: static unsigned int count = 0;
! 175:
! 176: (void)parent; /* we have no use for this */
! 177:
! 178: snprintf(filename, 128, "push%u", count++);
! 179:
! 180: /* here's a new stream, save it in a new file for each new push */
! 181: out = fopen(filename, "wb");
! 182: if(!out) {
! 183: /* if we can't save it, deny it */
! 184: fprintf(stderr, "Failed to create output file for push\n");
! 185: return CURL_PUSH_DENY;
! 186: }
! 187:
! 188: /* write to this file */
! 189: curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);
! 190:
! 191: fprintf(stderr, "**** push callback approves stream %u, got %lu headers!\n",
! 192: count, (unsigned long)num_headers);
! 193:
! 194: for(i = 0; i<num_headers; i++) {
! 195: headp = curl_pushheader_bynum(headers, i);
! 196: fprintf(stderr, "**** header %lu: %s\n", (unsigned long)i, headp);
! 197: }
! 198:
! 199: headp = curl_pushheader_byname(headers, ":path");
! 200: if(headp) {
! 201: fprintf(stderr, "**** The PATH is %s\n", headp /* skip :path + colon */);
! 202: }
! 203:
! 204: (*transfers)++; /* one more */
! 205: return CURL_PUSH_OK;
! 206: }
! 207:
! 208:
! 209: /*
! 210: * Download a file over HTTP/2, take care of server push.
! 211: */
! 212: int main(void)
! 213: {
! 214: CURL *easy;
! 215: CURLM *multi_handle;
! 216: int still_running; /* keep number of running handles */
! 217: int transfers = 1; /* we start with one */
! 218: struct CURLMsg *m;
! 219:
! 220: /* init a multi stack */
! 221: multi_handle = curl_multi_init();
! 222:
! 223: easy = curl_easy_init();
! 224:
! 225: /* set options */
! 226: if(setup(easy)) {
! 227: fprintf(stderr, "failed\n");
! 228: return 1;
! 229: }
! 230:
! 231: /* add the easy transfer */
! 232: curl_multi_add_handle(multi_handle, easy);
! 233:
! 234: curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
! 235: curl_multi_setopt(multi_handle, CURLMOPT_PUSHFUNCTION, server_push_callback);
! 236: curl_multi_setopt(multi_handle, CURLMOPT_PUSHDATA, &transfers);
! 237:
! 238: /* we start some action by calling perform right away */
! 239: curl_multi_perform(multi_handle, &still_running);
! 240:
! 241: do {
! 242: struct timeval timeout;
! 243: int rc; /* select() return code */
! 244: CURLMcode mc; /* curl_multi_fdset() return code */
! 245:
! 246: fd_set fdread;
! 247: fd_set fdwrite;
! 248: fd_set fdexcep;
! 249: int maxfd = -1;
! 250:
! 251: long curl_timeo = -1;
! 252:
! 253: FD_ZERO(&fdread);
! 254: FD_ZERO(&fdwrite);
! 255: FD_ZERO(&fdexcep);
! 256:
! 257: /* set a suitable timeout to play around with */
! 258: timeout.tv_sec = 1;
! 259: timeout.tv_usec = 0;
! 260:
! 261: curl_multi_timeout(multi_handle, &curl_timeo);
! 262: if(curl_timeo >= 0) {
! 263: timeout.tv_sec = curl_timeo / 1000;
! 264: if(timeout.tv_sec > 1)
! 265: timeout.tv_sec = 1;
! 266: else
! 267: timeout.tv_usec = (curl_timeo % 1000) * 1000;
! 268: }
! 269:
! 270: /* get file descriptors from the transfers */
! 271: mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
! 272:
! 273: if(mc != CURLM_OK) {
! 274: fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
! 275: break;
! 276: }
! 277:
! 278: /* On success the value of maxfd is guaranteed to be >= -1. We call
! 279: select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
! 280: no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
! 281: to sleep 100ms, which is the minimum suggested value in the
! 282: curl_multi_fdset() doc. */
! 283:
! 284: if(maxfd == -1) {
! 285: #ifdef _WIN32
! 286: Sleep(100);
! 287: rc = 0;
! 288: #else
! 289: /* Portable sleep for platforms other than Windows. */
! 290: struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
! 291: rc = select(0, NULL, NULL, NULL, &wait);
! 292: #endif
! 293: }
! 294: else {
! 295: /* Note that on some platforms 'timeout' may be modified by select().
! 296: If you need access to the original value save a copy beforehand. */
! 297: rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
! 298: }
! 299:
! 300: switch(rc) {
! 301: case -1:
! 302: /* select error */
! 303: break;
! 304: case 0:
! 305: default:
! 306: /* timeout or readable/writable sockets */
! 307: curl_multi_perform(multi_handle, &still_running);
! 308: break;
! 309: }
! 310:
! 311: /*
! 312: * A little caution when doing server push is that libcurl itself has
! 313: * created and added one or more easy handles but we need to clean them up
! 314: * when we are done.
! 315: */
! 316:
! 317: do {
! 318: int msgq = 0;;
! 319: m = curl_multi_info_read(multi_handle, &msgq);
! 320: if(m && (m->msg == CURLMSG_DONE)) {
! 321: CURL *e = m->easy_handle;
! 322: transfers--;
! 323: curl_multi_remove_handle(multi_handle, e);
! 324: curl_easy_cleanup(e);
! 325: }
! 326: } while(m);
! 327:
! 328: } while(transfers); /* as long as we have transfers going */
! 329:
! 330: curl_multi_cleanup(multi_handle);
! 331:
! 332:
! 333: return 0;
! 334: }
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