299 строки
8.4 KiB
C
299 строки
8.4 KiB
C
/***************************************************************************
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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 - 2004, 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 http://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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* $Id$
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***************************************************************************/
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#include "setup.h"
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#include <string.h>
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#include <errno.h>
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#define _REENTRANT
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#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
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#include <malloc.h>
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#else
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h> /* required for free() prototypes */
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h> /* for the close() proto */
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#endif
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#ifdef VMS
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#include <in.h>
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#include <inet.h>
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#include <stdlib.h>
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#endif
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#endif
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#ifdef HAVE_SETJMP_H
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#include <setjmp.h>
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#endif
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#ifdef WIN32
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#include <process.h>
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#endif
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#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
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#undef in_addr_t
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#define in_addr_t unsigned long
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#endif
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#include "urldata.h"
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#include "sendf.h"
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#include "hostip.h"
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#include "hash.h"
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#include "share.h"
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#include "strerror.h"
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#include "url.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
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#include "inet_ntoa_r.h"
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#endif
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/* The last #include file should be: */
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#ifdef CURLDEBUG
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#include "memdebug.h"
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#endif
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/***********************************************************************
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* Only for ares-enabled builds
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**********************************************************************/
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#ifdef CURLRES_ARES
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/*
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* Curl_fdset() is called when someone from the outside world (using
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* curl_multi_fdset()) wants to get our fd_set setup and we're talking with
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* ares. The caller must make sure that this function is only called when we
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* have a working ares channel.
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*
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* Returns: CURLE_OK always!
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*/
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CURLcode Curl_fdset(struct connectdata *conn,
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fd_set *read_fd_set,
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fd_set *write_fd_set,
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int *max_fdp)
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{
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int max = ares_fds(conn->data->state.areschannel,
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read_fd_set, write_fd_set);
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*max_fdp = max;
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return CURLE_OK;
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}
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/*
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* Curl_is_resolved() is called repeatedly to check if a previous name resolve
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* request has completed. It should also make sure to time-out if the
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* operation seems to take too long.
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*
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* Returns normal CURLcode errors.
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*/
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CURLcode Curl_is_resolved(struct connectdata *conn,
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struct Curl_dns_entry **dns)
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{
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fd_set read_fds, write_fds;
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struct timeval tv={0,0};
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int count;
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struct SessionHandle *data = conn->data;
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int nfds;
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FD_ZERO(&read_fds);
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FD_ZERO(&write_fds);
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nfds = ares_fds(data->state.areschannel, &read_fds, &write_fds);
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count = select(nfds, &read_fds, &write_fds, NULL,
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(struct timeval *)&tv);
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/* Call ares_process() unconditonally here, even if we simply timed out
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above, as otherwise the ares name resolve won't timeout! */
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ares_process(data->state.areschannel, &read_fds, &write_fds);
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*dns = NULL;
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if(conn->async.done) {
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/* we're done, kill the ares handle */
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if(!conn->async.dns)
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return CURLE_COULDNT_RESOLVE_HOST;
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*dns = conn->async.dns;
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}
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return CURLE_OK;
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}
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/*
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* Curl_wait_for_resolv() waits for a resolve to finish. This function should
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* be avoided since using this risk getting the multi interface to "hang".
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*
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* If 'entry' is non-NULL, make it point to the resolved dns entry
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*
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* Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved, and
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* CURLE_OPERATION_TIMEDOUT if a time-out occurred.
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*/
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CURLcode Curl_wait_for_resolv(struct connectdata *conn,
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struct Curl_dns_entry **entry)
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{
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CURLcode rc=CURLE_OK;
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struct SessionHandle *data = conn->data;
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long timeout = CURL_TIMEOUT_RESOLVE; /* default name resolve timeout */
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/* now, see if there's a connect timeout or a regular timeout to
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use instead of the default one */
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if(conn->data->set.connecttimeout)
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timeout = conn->data->set.connecttimeout;
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else if(conn->data->set.timeout)
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timeout = conn->data->set.timeout;
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/* We convert the number of seconds into number of milliseconds here: */
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if(timeout < 2147483)
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/* maximum amount of seconds that can be multiplied with 1000 and
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still fit within 31 bits */
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timeout *= 1000;
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else
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timeout = 0x7fffffff; /* ridiculous amount of time anyway */
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/* Wait for the name resolve query to complete. */
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while (1) {
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int nfds=0;
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fd_set read_fds, write_fds;
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struct timeval *tvp, tv, store;
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int count;
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struct timeval now = Curl_tvnow();
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long timediff;
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store.tv_sec = (int)timeout/1000;
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store.tv_usec = (timeout%1000)*1000;
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FD_ZERO(&read_fds);
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FD_ZERO(&write_fds);
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nfds = ares_fds(data->state.areschannel, &read_fds, &write_fds);
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if (nfds == 0)
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/* no file descriptors means we're done waiting */
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break;
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tvp = ares_timeout(data->state.areschannel, &store, &tv);
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count = select(nfds, &read_fds, &write_fds, NULL, tvp);
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if (count < 0 && errno != EINVAL)
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break;
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ares_process(data->state.areschannel, &read_fds, &write_fds);
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timediff = Curl_tvdiff(Curl_tvnow(), now); /* spent time */
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timeout -= timediff?timediff:1; /* always deduct at least 1 */
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if (timeout < 0) {
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/* our timeout, so we cancel the ares operation */
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ares_cancel(data->state.areschannel);
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break;
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}
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}
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/* Operation complete, if the lookup was successful we now have the entry
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in the cache. */
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if(entry)
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*entry = conn->async.dns;
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if(!conn->async.dns) {
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/* a name was not resolved */
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if((timeout < 0) || (conn->async.status == ARES_ETIMEOUT)) {
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failf(data, "Resolving host timed out: %s", conn->hostname);
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rc = CURLE_OPERATION_TIMEDOUT;
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}
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else if(conn->async.done) {
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failf(data, "Could not resolve host: %s (%s)", conn->hostname,
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ares_strerror(conn->async.status));
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rc = CURLE_COULDNT_RESOLVE_HOST;
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}
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else
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rc = CURLE_OPERATION_TIMEDOUT;
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/* close the connection, since we can't return failure here without
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cleaning up this connection properly */
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Curl_disconnect(conn);
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}
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return rc;
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}
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/*
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* Curl_getaddrinfo() - when using ares
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*
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* Returns name information about the given hostname and port number. If
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* successful, the 'hostent' is returned and the forth argument will point to
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* memory we need to free after use. That memory *MUST* be freed with
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* Curl_freeaddrinfo(), nothing else.
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*/
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Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
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char *hostname,
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int port,
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int *waitp)
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{
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char *bufp;
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struct SessionHandle *data = conn->data;
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in_addr_t in = inet_addr(hostname);
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*waitp = FALSE;
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if (in != CURL_INADDR_NONE)
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/* This is a dotted IP address 123.123.123.123-style */
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return Curl_ip2addr(in, hostname);
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bufp = strdup(hostname);
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if(bufp) {
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Curl_safefree(conn->async.hostname);
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conn->async.hostname = bufp;
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conn->async.port = port;
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conn->async.done = FALSE; /* not done */
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conn->async.status = 0; /* clear */
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conn->async.dns = NULL; /* clear */
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/* areschannel is already setup in the Curl_open() function */
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ares_gethostbyname(data->state.areschannel, hostname, PF_INET,
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Curl_addrinfo_callback, conn);
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*waitp = TRUE; /* please wait for the response */
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}
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return NULL; /* no struct yet */
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}
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#endif /* CURLRES_ARES */
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