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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
/* <DESC>
* HTTP/2 server push. Receive all data in memory.
* </DESC>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* somewhat unix-specific */
#include <sys/time.h>
#include <unistd.h>
/* curl stuff */
#include <curl/curl.h>
struct Memory {
char *memory;
size_t size;
};
static size_t
write_cb(void *contents, size_t size, size_t nmemb, void *userp)
{
size_t realsize = size * nmemb;
struct Memory *mem = (struct Memory *)userp;
char *ptr = realloc(mem->memory, mem->size + realsize + 1);
if(!ptr) {
/* out of memory! */
printf("not enough memory (realloc returned NULL)\n");
return 0;
}
mem->memory = ptr;
memcpy(&(mem->memory[mem->size]), contents, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
return realsize;
}
#define MAX_FILES 10
static struct Memory files[MAX_FILES];
static int pushindex = 1;
static void init_memory(struct Memory *chunk)
{
chunk->memory = malloc(1); /* grown as needed with realloc */
chunk->size = 0; /* no data at this point */
}
static void setup(CURL *hnd)
{
/* set the same URL */
curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
/* HTTP/2 please */
curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
/* we use a self-signed test server, skip verification during debugging */
curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
/* write data to a struct */
curl_easy_setopt(hnd, CURLOPT_WRITEFUNCTION, write_cb);
init_memory(&files[0]);
curl_easy_setopt(hnd, CURLOPT_WRITEDATA, &files[0]);
/* wait for pipe connection to confirm */
curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
}
/* called when there's an incoming push */
static int server_push_callback(CURL *parent,
CURL *easy,
size_t num_headers,
struct curl_pushheaders *headers,
void *userp)
{
char *headp;
int *transfers = (int *)userp;
(void)parent; /* we have no use for this */
(void)num_headers; /* unused */
if(pushindex == MAX_FILES)
/* can't fit anymore */
return CURL_PUSH_DENY;
/* write to this buffer */
init_memory(&files[pushindex]);
curl_easy_setopt(easy, CURLOPT_WRITEDATA, &files[pushindex]);
pushindex++;
headp = curl_pushheader_byname(headers, ":path");
if(headp)
fprintf(stderr, "* Pushed :path '%s'\n", headp /* skip :path + colon */);
(*transfers)++; /* one more */
return CURL_PUSH_OK;
}
/*
* Download a file over HTTP/2, take care of server push.
*/
int main(void)
{
CURL *easy;
CURLM *multi;
int still_running; /* keep number of running handles */
int transfers = 1; /* we start with one */
int i;
struct CURLMsg *m;
/* init a multi stack */
multi = curl_multi_init();
easy = curl_easy_init();
/* set options */
setup(easy);
/* add the easy transfer */
curl_multi_add_handle(multi, easy);
curl_multi_setopt(multi, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, server_push_callback);
curl_multi_setopt(multi, CURLMOPT_PUSHDATA, &transfers);
while(transfers) {
int rc;
CURLMcode mcode = curl_multi_perform(multi, &still_running);
if(mcode)
break;
mcode = curl_multi_wait(multi, NULL, 0, 1000, &rc);
if(mcode)
break;
/*
* When doing server push, libcurl itself created and added one or more
* easy handles but *we* need to clean them up when they are done.
*/
do {
int msgq = 0;;
m = curl_multi_info_read(multi, &msgq);
if(m && (m->msg == CURLMSG_DONE)) {
CURL *e = m->easy_handle;
transfers--;
curl_multi_remove_handle(multi, e);
curl_easy_cleanup(e);
}
} while(m);
}
curl_multi_cleanup(multi);
/* 'pushindex' is now the number of received transfers */
for(i = 0; i < pushindex; i++) {
/* do something fun with the data, and then free it when done */
free(files[i].memory);
}
return 0;
}
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