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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif
#ifdef USE_ARES
#include <ares.h>
#include <ares_version.h> /* really old c-ares did not include this by
itself */
#endif
#include "urldata.h"
#include "asyn.h"
#include "sendf.h"
#include "hostip.h"
#include "hash.h"
#include "multiif.h"
#include "select.h"
#include "share.h"
#include "url.h"
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
/***********************************************************************
* Only for builds using asynchronous name resolves
**********************************************************************/
#ifdef CURLRES_ASYNCH
#ifdef USE_ARES
#if ARES_VERSION < 0x010600
#error "requires c-ares 1.6.0 or newer"
#endif
/*
* Curl_ares_pollset() is called when the outside world (using
* curl_multi_fdset()) wants to get our fd_set setup and we are talking with
* ares. The caller must make sure that this function is only called when we
* have a working ares channel.
*
* Returns: sockets-in-use-bitmap
*/
CURLcode Curl_ares_pollset(struct Curl_easy *data,
ares_channel channel,
struct easy_pollset *ps)
{
struct timeval maxtime = { CURL_TIMEOUT_RESOLVE, 0 };
struct timeval timebuf;
curl_socket_t sockets[16]; /* ARES documented limit */
unsigned int bitmap, i;
struct timeval *timeout;
timediff_t milli;
CURLcode result = CURLE_OK;
DEBUGASSERT(channel);
if(!channel)
return CURLE_FAILED_INIT;
bitmap = ares_getsock(channel, (ares_socket_t *)sockets,
CURL_ARRAYSIZE(sockets));
for(i = 0; i < CURL_ARRAYSIZE(sockets); ++i) {
int flags = 0;
if(ARES_GETSOCK_READABLE(bitmap, i))
flags |= CURL_POLL_IN;
if(ARES_GETSOCK_WRITABLE(bitmap, i))
flags |= CURL_POLL_OUT;
if(!flags)
break;
result = Curl_pollset_change(data, ps, sockets[i], flags, 0);
if(result)
return result;
}
timeout = ares_timeout(channel, &maxtime, &timebuf);
if(!timeout)
timeout = &maxtime;
milli = curlx_tvtoms(timeout);
Curl_expire(data, milli, EXPIRE_ASYNC_NAME);
return result;
}
/*
* Curl_ares_perform()
*
* 1) Ask ares what sockets it currently plays with, then
* 2) wait for the timeout period to check for action on ares' sockets.
* 3) tell ares to act on all the sockets marked as "with action"
*
* return number of sockets it worked on, or -1 on error
*/
int Curl_ares_perform(ares_channel channel,
timediff_t timeout_ms)
{
int nfds;
int bitmask;
ares_socket_t socks[ARES_GETSOCK_MAXNUM];
struct pollfd pfd[ARES_GETSOCK_MAXNUM];
int i;
int num = 0;
if(!channel)
return 0;
bitmask = ares_getsock(channel, socks, ARES_GETSOCK_MAXNUM);
for(i = 0; i < ARES_GETSOCK_MAXNUM; i++) {
pfd[i].events = 0;
pfd[i].revents = 0;
if(ARES_GETSOCK_READABLE(bitmask, i)) {
pfd[i].fd = socks[i];
pfd[i].events |= POLLRDNORM|POLLIN;
}
if(ARES_GETSOCK_WRITABLE(bitmask, i)) {
pfd[i].fd = socks[i];
pfd[i].events |= POLLWRNORM|POLLOUT;
}
if(pfd[i].events)
num++;
else
break;
}
if(num) {
nfds = Curl_poll(pfd, (unsigned int)num, timeout_ms);
if(nfds < 0)
return -1;
}
else
nfds = 0;
if(!nfds)
/* Call ares_process() unconditionally here, even if we simply timed out
above, as otherwise the ares name resolve will not timeout! */
ares_process_fd(channel, ARES_SOCKET_BAD, ARES_SOCKET_BAD);
else {
/* move through the descriptors and ask for processing on them */
for(i = 0; i < num; i++)
ares_process_fd(channel,
(pfd[i].revents & (POLLRDNORM|POLLIN)) ?
pfd[i].fd : ARES_SOCKET_BAD,
(pfd[i].revents & (POLLWRNORM|POLLOUT)) ?
pfd[i].fd : ARES_SOCKET_BAD);
}
return nfds;
}
#endif
#endif /* CURLRES_ASYNCH */
#ifdef USE_CURL_ASYNC
#include "doh.h"
void Curl_async_shutdown(struct Curl_easy *data)
{
#ifdef CURLRES_ARES
Curl_async_ares_shutdown(data);
#endif
#ifdef CURLRES_THREADED
Curl_async_thrdd_shutdown(data);
#endif
#ifndef CURL_DISABLE_DOH
Curl_doh_cleanup(data);
#endif
Curl_safefree(data->state.async.hostname);
}
void Curl_async_destroy(struct Curl_easy *data)
{
#ifdef CURLRES_ARES
Curl_async_ares_destroy(data);
#endif
#ifdef CURLRES_THREADED
Curl_async_thrdd_destroy(data);
#endif
#ifndef CURL_DISABLE_DOH
Curl_doh_cleanup(data);
#endif
Curl_safefree(data->state.async.hostname);
}
#endif /* USE_CURL_ASYNC */