335 lines
8.9 KiB
C
335 lines
8.9 KiB
C
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/* <DESC>
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* HTTP/2 server push
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* </DESC>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* somewhat unix-specific */
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#include <sys/time.h>
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#include <unistd.h>
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/* curl stuff */
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#include <curl/curl.h>
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#ifndef CURLPIPE_MULTIPLEX
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#error "too old libcurl, can't do HTTP/2 server push!"
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#endif
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static
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void dump(const char *text, unsigned char *ptr, size_t size,
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char nohex)
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{
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size_t i;
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size_t c;
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unsigned int width = 0x10;
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if(nohex)
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/* without the hex output, we can fit more on screen */
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width = 0x40;
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fprintf(stderr, "%s, %lu bytes (0x%lx)\n",
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text, (unsigned long)size, (unsigned long)size);
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for(i = 0; i<size; i += width) {
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fprintf(stderr, "%4.4lx: ", (unsigned long)i);
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if(!nohex) {
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/* hex not disabled, show it */
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for(c = 0; c < width; c++)
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if(i + c < size)
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fprintf(stderr, "%02x ", ptr[i + c]);
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else
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fputs(" ", stderr);
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}
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for(c = 0; (c < width) && (i + c < size); c++) {
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/* check for 0D0A; if found, skip past and start a new line of output */
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if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
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ptr[i + c + 1] == 0x0A) {
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i += (c + 2 - width);
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break;
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}
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fprintf(stderr, "%c",
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(ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
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/* check again for 0D0A, to avoid an extra \n if it's at width */
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if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
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ptr[i + c + 2] == 0x0A) {
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i += (c + 3 - width);
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break;
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}
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}
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fputc('\n', stderr); /* newline */
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}
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}
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static
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int my_trace(CURL *handle, curl_infotype type,
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char *data, size_t size,
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void *userp)
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{
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const char *text;
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(void)handle; /* prevent compiler warning */
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(void)userp;
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switch(type) {
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case CURLINFO_TEXT:
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fprintf(stderr, "== Info: %s", data);
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/* FALLTHROUGH */
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default: /* in case a new one is introduced to shock us */
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return 0;
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case CURLINFO_HEADER_OUT:
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text = "=> Send header";
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break;
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case CURLINFO_DATA_OUT:
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text = "=> Send data";
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break;
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case CURLINFO_SSL_DATA_OUT:
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text = "=> Send SSL data";
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break;
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case CURLINFO_HEADER_IN:
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text = "<= Recv header";
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break;
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case CURLINFO_DATA_IN:
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text = "<= Recv data";
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break;
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case CURLINFO_SSL_DATA_IN:
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text = "<= Recv SSL data";
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break;
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}
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dump(text, (unsigned char *)data, size, 1);
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return 0;
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}
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#define OUTPUTFILE "dl"
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static int setup(CURL *hnd)
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{
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FILE *out = fopen(OUTPUTFILE, "wb");
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if(!out)
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/* failed */
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return 1;
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/* write to this file */
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curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out);
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/* set the same URL */
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curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
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/* please be verbose */
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curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
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curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
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/* HTTP/2 please */
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curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
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/* we use a self-signed test server, skip verification during debugging */
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curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
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curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
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#if (CURLPIPE_MULTIPLEX > 0)
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/* wait for pipe connection to confirm */
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curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
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#endif
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return 0; /* all is good */
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}
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/* called when there's an incoming push */
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static int server_push_callback(CURL *parent,
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CURL *easy,
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size_t num_headers,
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struct curl_pushheaders *headers,
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void *userp)
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{
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char *headp;
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size_t i;
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int *transfers = (int *)userp;
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char filename[128];
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FILE *out;
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static unsigned int count = 0;
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(void)parent; /* we have no use for this */
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snprintf(filename, 128, "push%u", count++);
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/* here's a new stream, save it in a new file for each new push */
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out = fopen(filename, "wb");
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if(!out) {
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/* if we can't save it, deny it */
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fprintf(stderr, "Failed to create output file for push\n");
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return CURL_PUSH_DENY;
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}
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/* write to this file */
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curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);
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fprintf(stderr, "**** push callback approves stream %u, got %lu headers!\n",
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count, (unsigned long)num_headers);
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for(i = 0; i<num_headers; i++) {
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headp = curl_pushheader_bynum(headers, i);
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fprintf(stderr, "**** header %lu: %s\n", (unsigned long)i, headp);
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}
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headp = curl_pushheader_byname(headers, ":path");
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if(headp) {
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fprintf(stderr, "**** The PATH is %s\n", headp /* skip :path + colon */);
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}
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(*transfers)++; /* one more */
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return CURL_PUSH_OK;
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}
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/*
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* Download a file over HTTP/2, take care of server push.
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*/
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int main(void)
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{
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CURL *easy;
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CURLM *multi_handle;
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int still_running; /* keep number of running handles */
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int transfers = 1; /* we start with one */
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struct CURLMsg *m;
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/* init a multi stack */
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multi_handle = curl_multi_init();
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easy = curl_easy_init();
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/* set options */
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if(setup(easy)) {
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fprintf(stderr, "failed\n");
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return 1;
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}
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/* add the easy transfer */
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curl_multi_add_handle(multi_handle, easy);
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curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
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curl_multi_setopt(multi_handle, CURLMOPT_PUSHFUNCTION, server_push_callback);
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curl_multi_setopt(multi_handle, CURLMOPT_PUSHDATA, &transfers);
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/* we start some action by calling perform right away */
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curl_multi_perform(multi_handle, &still_running);
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do {
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struct timeval timeout;
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int rc; /* select() return code */
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CURLMcode mc; /* curl_multi_fdset() return code */
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fd_set fdread;
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fd_set fdwrite;
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fd_set fdexcep;
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int maxfd = -1;
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long curl_timeo = -1;
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FD_ZERO(&fdread);
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FD_ZERO(&fdwrite);
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FD_ZERO(&fdexcep);
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/* set a suitable timeout to play around with */
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timeout.tv_sec = 1;
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timeout.tv_usec = 0;
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curl_multi_timeout(multi_handle, &curl_timeo);
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if(curl_timeo >= 0) {
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timeout.tv_sec = curl_timeo / 1000;
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if(timeout.tv_sec > 1)
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timeout.tv_sec = 1;
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else
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timeout.tv_usec = (curl_timeo % 1000) * 1000;
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}
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/* get file descriptors from the transfers */
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mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
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if(mc != CURLM_OK) {
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fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
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break;
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}
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/* On success the value of maxfd is guaranteed to be >= -1. We call
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select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
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no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
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to sleep 100ms, which is the minimum suggested value in the
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curl_multi_fdset() doc. */
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if(maxfd == -1) {
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#ifdef _WIN32
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Sleep(100);
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rc = 0;
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#else
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/* Portable sleep for platforms other than Windows. */
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struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
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rc = select(0, NULL, NULL, NULL, &wait);
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#endif
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}
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else {
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/* Note that on some platforms 'timeout' may be modified by select().
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If you need access to the original value save a copy beforehand. */
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rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
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}
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switch(rc) {
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case -1:
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/* select error */
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break;
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case 0:
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default:
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/* timeout or readable/writable sockets */
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curl_multi_perform(multi_handle, &still_running);
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break;
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}
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/*
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* A little caution when doing server push is that libcurl itself has
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* created and added one or more easy handles but we need to clean them up
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* when we are done.
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*/
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do {
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int msgq = 0;;
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m = curl_multi_info_read(multi_handle, &msgq);
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if(m && (m->msg == CURLMSG_DONE)) {
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CURL *e = m->easy_handle;
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transfers--;
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curl_multi_remove_handle(multi_handle, e);
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curl_easy_cleanup(e);
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}
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} while(m);
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} while(transfers); /* as long as we have transfers going */
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curl_multi_cleanup(multi_handle);
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return 0;
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}
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