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e5d574c54f
There is no benefit to holding the data sharelock when freeing the addrinfo in case it fails, so ensure releaseing it as soon as we can rather than holding on to it. This also aligns the code with other consumers of sharelocks. Closes #3516 Reviewed-by: Daniel Stenberg <daniel@haxx.se>
129 lines
3.8 KiB
C
129 lines
3.8 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 - 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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#include "curl_setup.h"
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/***********************************************************************
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* Only for builds using asynchronous name resolves
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**********************************************************************/
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#ifdef CURLRES_ASYNCH
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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 __VMS
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#include <in.h>
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#include <inet.h>
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#endif
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#ifdef HAVE_PROCESS_H
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#include <process.h>
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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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#include "curl_memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/*
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* Curl_addrinfo_callback() gets called by ares, gethostbyname_thread()
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* or getaddrinfo_thread() when we got the name resolved (or not!).
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*
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* If the status argument is CURL_ASYNC_SUCCESS, this function takes
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* ownership of the Curl_addrinfo passed, storing the resolved data
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* in the DNS cache.
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*
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* The storage operation locks and unlocks the DNS cache.
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*/
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CURLcode Curl_addrinfo_callback(struct connectdata *conn,
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int status,
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struct Curl_addrinfo *ai)
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{
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struct Curl_dns_entry *dns = NULL;
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CURLcode result = CURLE_OK;
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conn->async.status = status;
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if(CURL_ASYNC_SUCCESS == status) {
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if(ai) {
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struct Curl_easy *data = conn->data;
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if(data->share)
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Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
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dns = Curl_cache_addr(data, ai,
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conn->async.hostname,
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conn->async.port);
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if(data->share)
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Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
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if(!dns) {
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/* failed to store, cleanup and return error */
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Curl_freeaddrinfo(ai);
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result = CURLE_OUT_OF_MEMORY;
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}
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}
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else {
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result = CURLE_OUT_OF_MEMORY;
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}
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}
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conn->async.dns = dns;
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/* Set async.done TRUE last in this function since it may be used multi-
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threaded and once this is TRUE the other thread may read fields from the
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async struct */
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conn->async.done = TRUE;
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/* IPv4: The input hostent struct will be freed by ares when we return from
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this function */
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return result;
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}
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/*
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* Curl_getaddrinfo() is the generic low-level name resolve API within this
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* source file. There are several versions of this function - for different
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* name resolve layers (selected at build-time). They all take this same set
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* of arguments
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*/
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Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
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const char *hostname,
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int port,
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int *waitp)
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{
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return Curl_resolver_getaddrinfo(conn, hostname, port, waitp);
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}
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#endif /* CURLRES_ASYNCH */
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