mirror of
https://github.com/moparisthebest/curl
synced 2024-11-16 14:35:03 -05:00
335 lines
8.9 KiB
C
335 lines
8.9 KiB
C
/***************************************************************************
|
|
* _ _ ____ _
|
|
* 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
|
|
* </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>
|
|
|
|
#ifndef CURLPIPE_MULTIPLEX
|
|
#error "too old libcurl, can't do HTTP/2 server push!"
|
|
#endif
|
|
|
|
static
|
|
void dump(const char *text, unsigned char *ptr, size_t size,
|
|
char nohex)
|
|
{
|
|
size_t i;
|
|
size_t c;
|
|
|
|
unsigned int width = 0x10;
|
|
|
|
if(nohex)
|
|
/* without the hex output, we can fit more on screen */
|
|
width = 0x40;
|
|
|
|
fprintf(stderr, "%s, %lu bytes (0x%lx)\n",
|
|
text, (unsigned long)size, (unsigned long)size);
|
|
|
|
for(i = 0; i<size; i += width) {
|
|
|
|
fprintf(stderr, "%4.4lx: ", (unsigned long)i);
|
|
|
|
if(!nohex) {
|
|
/* hex not disabled, show it */
|
|
for(c = 0; c < width; c++)
|
|
if(i + c < size)
|
|
fprintf(stderr, "%02x ", ptr[i + c]);
|
|
else
|
|
fputs(" ", stderr);
|
|
}
|
|
|
|
for(c = 0; (c < width) && (i + c < size); c++) {
|
|
/* check for 0D0A; if found, skip past and start a new line of output */
|
|
if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
|
|
ptr[i + c + 1] == 0x0A) {
|
|
i += (c + 2 - width);
|
|
break;
|
|
}
|
|
fprintf(stderr, "%c",
|
|
(ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
|
|
/* check again for 0D0A, to avoid an extra \n if it's at width */
|
|
if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
|
|
ptr[i + c + 2] == 0x0A) {
|
|
i += (c + 3 - width);
|
|
break;
|
|
}
|
|
}
|
|
fputc('\n', stderr); /* newline */
|
|
}
|
|
}
|
|
|
|
static
|
|
int my_trace(CURL *handle, curl_infotype type,
|
|
char *data, size_t size,
|
|
void *userp)
|
|
{
|
|
const char *text;
|
|
(void)handle; /* prevent compiler warning */
|
|
(void)userp;
|
|
switch(type) {
|
|
case CURLINFO_TEXT:
|
|
fprintf(stderr, "== Info: %s", data);
|
|
/* FALLTHROUGH */
|
|
default: /* in case a new one is introduced to shock us */
|
|
return 0;
|
|
|
|
case CURLINFO_HEADER_OUT:
|
|
text = "=> Send header";
|
|
break;
|
|
case CURLINFO_DATA_OUT:
|
|
text = "=> Send data";
|
|
break;
|
|
case CURLINFO_SSL_DATA_OUT:
|
|
text = "=> Send SSL data";
|
|
break;
|
|
case CURLINFO_HEADER_IN:
|
|
text = "<= Recv header";
|
|
break;
|
|
case CURLINFO_DATA_IN:
|
|
text = "<= Recv data";
|
|
break;
|
|
case CURLINFO_SSL_DATA_IN:
|
|
text = "<= Recv SSL data";
|
|
break;
|
|
}
|
|
|
|
dump(text, (unsigned char *)data, size, 1);
|
|
return 0;
|
|
}
|
|
|
|
#define OUTPUTFILE "dl"
|
|
|
|
static int setup(CURL *hnd)
|
|
{
|
|
FILE *out = fopen(OUTPUTFILE, "wb");
|
|
if(!out)
|
|
/* failed */
|
|
return 1;
|
|
|
|
/* write to this file */
|
|
curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out);
|
|
|
|
/* set the same URL */
|
|
curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
|
|
|
|
/* please be verbose */
|
|
curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
|
|
curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
|
|
|
|
/* 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);
|
|
|
|
#if (CURLPIPE_MULTIPLEX > 0)
|
|
/* wait for pipe connection to confirm */
|
|
curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
|
|
#endif
|
|
return 0; /* all is good */
|
|
}
|
|
|
|
/* 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;
|
|
size_t i;
|
|
int *transfers = (int *)userp;
|
|
char filename[128];
|
|
FILE *out;
|
|
static unsigned int count = 0;
|
|
|
|
(void)parent; /* we have no use for this */
|
|
|
|
snprintf(filename, 128, "push%u", count++);
|
|
|
|
/* here's a new stream, save it in a new file for each new push */
|
|
out = fopen(filename, "wb");
|
|
if(!out) {
|
|
/* if we can't save it, deny it */
|
|
fprintf(stderr, "Failed to create output file for push\n");
|
|
return CURL_PUSH_DENY;
|
|
}
|
|
|
|
/* write to this file */
|
|
curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);
|
|
|
|
fprintf(stderr, "**** push callback approves stream %u, got %lu headers!\n",
|
|
count, (unsigned long)num_headers);
|
|
|
|
for(i = 0; i<num_headers; i++) {
|
|
headp = curl_pushheader_bynum(headers, i);
|
|
fprintf(stderr, "**** header %lu: %s\n", (unsigned long)i, headp);
|
|
}
|
|
|
|
headp = curl_pushheader_byname(headers, ":path");
|
|
if(headp) {
|
|
fprintf(stderr, "**** The PATH is %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_handle;
|
|
int still_running; /* keep number of running handles */
|
|
int transfers = 1; /* we start with one */
|
|
struct CURLMsg *m;
|
|
|
|
/* init a multi stack */
|
|
multi_handle = curl_multi_init();
|
|
|
|
easy = curl_easy_init();
|
|
|
|
/* set options */
|
|
if(setup(easy)) {
|
|
fprintf(stderr, "failed\n");
|
|
return 1;
|
|
}
|
|
|
|
/* add the easy transfer */
|
|
curl_multi_add_handle(multi_handle, easy);
|
|
|
|
curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
|
|
curl_multi_setopt(multi_handle, CURLMOPT_PUSHFUNCTION, server_push_callback);
|
|
curl_multi_setopt(multi_handle, CURLMOPT_PUSHDATA, &transfers);
|
|
|
|
/* we start some action by calling perform right away */
|
|
curl_multi_perform(multi_handle, &still_running);
|
|
|
|
do {
|
|
struct timeval timeout;
|
|
int rc; /* select() return code */
|
|
CURLMcode mc; /* curl_multi_fdset() return code */
|
|
|
|
fd_set fdread;
|
|
fd_set fdwrite;
|
|
fd_set fdexcep;
|
|
int maxfd = -1;
|
|
|
|
long curl_timeo = -1;
|
|
|
|
FD_ZERO(&fdread);
|
|
FD_ZERO(&fdwrite);
|
|
FD_ZERO(&fdexcep);
|
|
|
|
/* set a suitable timeout to play around with */
|
|
timeout.tv_sec = 1;
|
|
timeout.tv_usec = 0;
|
|
|
|
curl_multi_timeout(multi_handle, &curl_timeo);
|
|
if(curl_timeo >= 0) {
|
|
timeout.tv_sec = curl_timeo / 1000;
|
|
if(timeout.tv_sec > 1)
|
|
timeout.tv_sec = 1;
|
|
else
|
|
timeout.tv_usec = (curl_timeo % 1000) * 1000;
|
|
}
|
|
|
|
/* get file descriptors from the transfers */
|
|
mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
|
|
|
|
if(mc != CURLM_OK) {
|
|
fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
|
|
break;
|
|
}
|
|
|
|
/* On success the value of maxfd is guaranteed to be >= -1. We call
|
|
select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
|
|
no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
|
|
to sleep 100ms, which is the minimum suggested value in the
|
|
curl_multi_fdset() doc. */
|
|
|
|
if(maxfd == -1) {
|
|
#ifdef _WIN32
|
|
Sleep(100);
|
|
rc = 0;
|
|
#else
|
|
/* Portable sleep for platforms other than Windows. */
|
|
struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
|
|
rc = select(0, NULL, NULL, NULL, &wait);
|
|
#endif
|
|
}
|
|
else {
|
|
/* Note that on some platforms 'timeout' may be modified by select().
|
|
If you need access to the original value save a copy beforehand. */
|
|
rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
|
|
}
|
|
|
|
switch(rc) {
|
|
case -1:
|
|
/* select error */
|
|
break;
|
|
case 0:
|
|
default:
|
|
/* timeout or readable/writable sockets */
|
|
curl_multi_perform(multi_handle, &still_running);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* A little caution when doing server push is that libcurl itself has
|
|
* created and added one or more easy handles but we need to clean them up
|
|
* when we are done.
|
|
*/
|
|
|
|
do {
|
|
int msgq = 0;
|
|
m = curl_multi_info_read(multi_handle, &msgq);
|
|
if(m && (m->msg == CURLMSG_DONE)) {
|
|
CURL *e = m->easy_handle;
|
|
transfers--;
|
|
curl_multi_remove_handle(multi_handle, e);
|
|
curl_easy_cleanup(e);
|
|
}
|
|
} while(m);
|
|
|
|
} while(transfers); /* as long as we have transfers going */
|
|
|
|
curl_multi_cleanup(multi_handle);
|
|
|
|
|
|
return 0;
|
|
}
|