835 строки
24 KiB
C
835 строки
24 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 - 2007, 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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#ifdef NEED_MALLOC_H
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#include <malloc.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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#ifdef HAVE_SETJMP_H
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#include <setjmp.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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#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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#include "multiif.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#include "inet_ntop.h"
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#include "memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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#if defined(_MSC_VER) && defined(CURL_NO__BEGINTHREADEX)
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#pragma message ("No _beginthreadex() available in this RTL")
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#endif
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/***********************************************************************
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* Only for Windows threaded name resolves builds
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**********************************************************************/
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#ifdef CURLRES_THREADED
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/* This function is used to init a threaded resolve */
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static bool init_resolve_thread(struct connectdata *conn,
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const char *hostname, int port,
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const Curl_addrinfo *hints);
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#ifdef CURLRES_IPV4
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#define THREAD_FUNC gethostbyname_thread
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#define THREAD_NAME "gethostbyname_thread"
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#else
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#define THREAD_FUNC getaddrinfo_thread
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#define THREAD_NAME "getaddrinfo_thread"
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#endif
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#if defined(DEBUG_THREADING_GETHOSTBYNAME) || \
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defined(DEBUG_THREADING_GETADDRINFO)
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/* If this is defined, provide tracing */
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#define TRACE(args) \
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do { trace_it("%u: ", __LINE__); trace_it args; } while (0)
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static void trace_it (const char *fmt, ...)
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{
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static int do_trace = -1;
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va_list args;
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if (do_trace == -1) {
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const char *env = getenv("CURL_TRACE");
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do_trace = (env && atoi(env) > 0);
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}
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if (!do_trace)
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return;
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va_start (args, fmt);
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vfprintf (stderr, fmt, args);
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fflush (stderr);
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va_end (args);
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}
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#else
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#define TRACE(x)
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#endif
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#ifdef DEBUG_THREADING_GETADDRINFO
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static void dump_addrinfo (struct connectdata *conn, const struct addrinfo *ai)
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{
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TRACE(("dump_addrinfo:\n"));
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for ( ; ai; ai = ai->ai_next) {
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char buf [INET6_ADDRSTRLEN];
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trace_it(" fam %2d, CNAME %s, ",
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ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
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if (Curl_printable_address(ai, buf, sizeof(buf)))
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trace_it("%s\n", buf);
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else
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trace_it("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
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}
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}
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#endif
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struct thread_data {
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HANDLE thread_hnd;
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unsigned thread_id;
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DWORD thread_status;
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curl_socket_t dummy_sock; /* dummy for Curl_resolv_fdset() */
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HANDLE mutex_waiting; /* marks that we are still waiting for a resolve */
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HANDLE event_resolved; /* marks that the thread obtained the information */
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HANDLE event_thread_started; /* marks that the thread has initialized and
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started */
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HANDLE mutex_terminate; /* serializes access to flag_terminate */
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HANDLE event_terminate; /* flag for thread to terminate instead of calling
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callbacks */
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#ifdef CURLRES_IPV6
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struct addrinfo hints;
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#endif
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};
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/* Data for synchronization between resolver thread and its parent */
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struct thread_sync_data {
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HANDLE mutex_waiting; /* thread_data.mutex_waiting duplicate */
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HANDLE mutex_terminate; /* thread_data.mutex_terminate duplicate */
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HANDLE event_terminate; /* thread_data.event_terminate duplicate */
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char * hostname; /* hostname to resolve, Curl_async.hostname
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duplicate */
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};
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/* Destroy resolver thread synchronization data */
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static
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void destroy_thread_sync_data(struct thread_sync_data * tsd)
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{
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if (tsd->hostname)
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free(tsd->hostname);
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if (tsd->event_terminate)
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CloseHandle(tsd->event_terminate);
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if (tsd->mutex_terminate)
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CloseHandle(tsd->mutex_terminate);
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if (tsd->mutex_waiting)
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CloseHandle(tsd->mutex_waiting);
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memset(tsd,0,sizeof(*tsd));
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}
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/* Initialize resolver thread synchronization data */
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static
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BOOL init_thread_sync_data(struct thread_data * td,
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const char * hostname,
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struct thread_sync_data * tsd)
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{
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HANDLE curr_proc = GetCurrentProcess();
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memset(tsd, 0, sizeof(*tsd));
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if (!DuplicateHandle(curr_proc, td->mutex_waiting,
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curr_proc, &tsd->mutex_waiting, 0, FALSE,
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DUPLICATE_SAME_ACCESS)) {
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/* failed to duplicate the mutex, no point in continuing */
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destroy_thread_sync_data(tsd);
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return FALSE;
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}
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if (!DuplicateHandle(curr_proc, td->mutex_terminate,
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curr_proc, &tsd->mutex_terminate, 0, FALSE,
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DUPLICATE_SAME_ACCESS)) {
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/* failed to duplicate the mutex, no point in continuing */
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destroy_thread_sync_data(tsd);
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return FALSE;
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}
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if (!DuplicateHandle(curr_proc, td->event_terminate,
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curr_proc, &tsd->event_terminate, 0, FALSE,
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DUPLICATE_SAME_ACCESS)) {
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/* failed to duplicate the event, no point in continuing */
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destroy_thread_sync_data(tsd);
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return FALSE;
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}
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/* Copying hostname string because original can be destroyed by parent
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* thread during gethostbyname execution.
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*/
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tsd->hostname = strdup(hostname);
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if (!tsd->hostname) {
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/* Memory allocation failed */
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destroy_thread_sync_data(tsd);
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return FALSE;
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}
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return TRUE;
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}
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/* acquire resolver thread synchronization */
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static
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BOOL acquire_thread_sync(struct thread_sync_data * tsd)
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{
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/* is the thread initiator still waiting for us ? */
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if (WaitForSingleObject(tsd->mutex_waiting, 0) == WAIT_TIMEOUT) {
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/* yes, it is */
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/* Waiting access to event_terminate */
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if (WaitForSingleObject(tsd->mutex_terminate, INFINITE) != WAIT_OBJECT_0) {
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/* Something went wrong - now just ignoring */
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}
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else {
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if (WaitForSingleObject(tsd->event_terminate, 0) != WAIT_TIMEOUT) {
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/* Parent thread signaled us to terminate.
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* This means that all data in conn->async is now destroyed
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* and we cannot use it.
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*/
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}
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else {
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return TRUE;
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}
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}
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}
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return FALSE;
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}
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/* release resolver thread synchronization */
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static
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void release_thread_sync(struct thread_sync_data * tsd)
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{
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ReleaseMutex(tsd->mutex_terminate);
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}
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#if defined(CURLRES_IPV4)
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/*
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* gethostbyname_thread() resolves a name, calls the Curl_addrinfo4_callback
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* and then exits.
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*
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* For builds without ARES/ENABLE_IPV6, create a resolver thread and wait on
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* it.
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*/
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static unsigned __stdcall gethostbyname_thread (void *arg)
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{
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struct connectdata *conn = (struct connectdata*) arg;
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struct thread_data *td = (struct thread_data*) conn->async.os_specific;
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struct hostent *he;
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int rc = 0;
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/* Duplicate the passed mutex and event handles.
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* This allows us to use it even after the container gets destroyed
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* due to a resolver timeout.
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*/
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struct thread_sync_data tsd = { 0,0,0,NULL };
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if (!init_thread_sync_data(td, conn->async.hostname, &tsd)) {
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/* thread synchronization data initialization failed */
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return (unsigned)-1;
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}
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conn->async.status = NO_DATA; /* pending status */
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SET_SOCKERRNO(conn->async.status);
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/* Signaling that we have initialized all copies of data and handles we
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need */
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SetEvent(td->event_thread_started);
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he = gethostbyname (tsd.hostname);
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/* is parent thread waiting for us and are we able to access conn members? */
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if (acquire_thread_sync(&tsd)) {
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/* Mark that we have obtained the information, and that we are calling
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* back with it. */
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SetEvent(td->event_resolved);
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if (he) {
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rc = Curl_addrinfo4_callback(conn, CURL_ASYNC_SUCCESS, he);
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}
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else {
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rc = Curl_addrinfo4_callback(conn, SOCKERRNO, NULL);
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}
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TRACE(("Winsock-error %d, addr %s\n", conn->async.status,
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he ? inet_ntoa(*(struct in_addr*)he->h_addr) : "unknown"));
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release_thread_sync(&tsd);
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}
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/* clean up */
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destroy_thread_sync_data(&tsd);
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return (rc);
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/* An implicit _endthreadex() here */
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}
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#elif defined(CURLRES_IPV6)
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/*
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* getaddrinfo_thread() resolves a name, calls Curl_addrinfo6_callback and then
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* exits.
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*
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* For builds without ARES, but with ENABLE_IPV6, create a resolver thread
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* and wait on it.
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*/
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static unsigned __stdcall getaddrinfo_thread (void *arg)
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{
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struct connectdata *conn = (struct connectdata*) arg;
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struct thread_data *td = (struct thread_data*) conn->async.os_specific;
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struct addrinfo *res;
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char service [NI_MAXSERV];
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int rc;
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struct addrinfo hints = td->hints;
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/* Duplicate the passed mutex handle.
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* This allows us to use it even after the container gets destroyed
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* due to a resolver timeout.
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*/
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struct thread_sync_data tsd = { 0,0,0,NULL };
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if (!init_thread_sync_data(td, conn->async.hostname, &tsd)) {
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/* thread synchronization data initialization failed */
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return -1;
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}
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itoa(conn->async.port, service, 10);
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conn->async.status = NO_DATA; /* pending status */
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SET_SOCKERRNO(conn->async.status);
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/* Signaling that we have initialized all copies of data and handles we
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need */
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SetEvent(td->event_thread_started);
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rc = getaddrinfo(tsd.hostname, service, &hints, &res);
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/* is parent thread waiting for us and are we able to access conn members? */
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if (acquire_thread_sync(&tsd)) {
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/* Mark that we have obtained the information, and that we are calling
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back with it. */
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SetEvent(td->event_resolved);
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if (rc == 0) {
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#ifdef DEBUG_THREADING_GETADDRINFO
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dump_addrinfo (conn, res);
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#endif
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rc = Curl_addrinfo6_callback(conn, CURL_ASYNC_SUCCESS, res);
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}
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else {
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rc = Curl_addrinfo6_callback(conn, SOCKERRNO, NULL);
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TRACE(("Winsock-error %d, no address\n", conn->async.status));
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}
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release_thread_sync(&tsd);
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}
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/* clean up */
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destroy_thread_sync_data(&tsd);
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return (rc);
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/* An implicit _endthreadex() here */
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}
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#endif
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/*
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* Curl_destroy_thread_data() cleans up async resolver data and thread handle.
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* Complementary of ares_destroy.
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*/
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void Curl_destroy_thread_data (struct Curl_async *async)
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{
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if (async->hostname)
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free(async->hostname);
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if (async->os_specific) {
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struct thread_data *td = (struct thread_data*) async->os_specific;
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curl_socket_t sock = td->dummy_sock;
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if (td->mutex_terminate && td->event_terminate) {
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/* Signaling resolver thread to terminate */
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if (WaitForSingleObject(td->mutex_terminate, INFINITE) == WAIT_OBJECT_0) {
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SetEvent(td->event_terminate);
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ReleaseMutex(td->mutex_terminate);
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}
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else {
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/* Something went wrong - just ignoring it */
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}
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}
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if (td->mutex_terminate)
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CloseHandle(td->mutex_terminate);
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if (td->event_terminate)
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CloseHandle(td->event_terminate);
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if (td->event_thread_started)
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CloseHandle(td->event_thread_started);
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if (sock != CURL_SOCKET_BAD)
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sclose(sock);
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/* destroy the synchronization objects */
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if (td->mutex_waiting)
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CloseHandle(td->mutex_waiting);
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td->mutex_waiting = NULL;
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if (td->event_resolved)
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CloseHandle(td->event_resolved);
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if (td->thread_hnd)
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CloseHandle(td->thread_hnd);
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free(async->os_specific);
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}
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async->hostname = NULL;
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async->os_specific = NULL;
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}
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/*
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* init_resolve_thread() starts a new thread that performs the actual
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* resolve. This function returns before the resolve is done.
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*
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* Returns FALSE in case of failure, otherwise TRUE.
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*/
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static bool init_resolve_thread (struct connectdata *conn,
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const char *hostname, int port,
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const Curl_addrinfo *hints)
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{
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struct thread_data *td = calloc(sizeof(*td), 1);
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HANDLE thread_and_event[2] = {0};
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if (!td) {
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SET_ERRNO(ENOMEM);
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return FALSE;
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}
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Curl_safefree(conn->async.hostname);
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conn->async.hostname = strdup(hostname);
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if (!conn->async.hostname) {
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free(td);
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SET_ERRNO(ENOMEM);
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return FALSE;
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}
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conn->async.port = port;
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conn->async.done = FALSE;
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conn->async.status = 0;
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conn->async.dns = NULL;
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conn->async.os_specific = (void*) td;
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td->dummy_sock = CURL_SOCKET_BAD;
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/* Create the mutex used to inform the resolver thread that we're
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* still waiting, and take initial ownership.
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*/
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td->mutex_waiting = CreateMutex(NULL, TRUE, NULL);
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if (td->mutex_waiting == NULL) {
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Curl_destroy_thread_data(&conn->async);
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SET_ERRNO(EAGAIN);
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return FALSE;
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}
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/* Create the event that the thread uses to inform us that it's
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* done resolving. Do not signal it.
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*/
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td->event_resolved = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (td->event_resolved == NULL) {
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Curl_destroy_thread_data(&conn->async);
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SET_ERRNO(EAGAIN);
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return FALSE;
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}
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/* Create the mutex used to serialize access to event_terminated
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* between us and resolver thread.
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*/
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td->mutex_terminate = CreateMutex(NULL, FALSE, NULL);
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if (td->mutex_terminate == NULL) {
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Curl_destroy_thread_data(&conn->async);
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SET_ERRNO(EAGAIN);
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return FALSE;
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}
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/* Create the event used to signal thread that it should terminate.
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*/
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td->event_terminate = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (td->event_terminate == NULL) {
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Curl_destroy_thread_data(&conn->async);
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SET_ERRNO(EAGAIN);
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return FALSE;
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}
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/* Create the event used by thread to inform it has initialized its own data.
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*/
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td->event_thread_started = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (td->event_thread_started == NULL) {
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Curl_destroy_thread_data(&conn->async);
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SET_ERRNO(EAGAIN);
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return FALSE;
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}
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#ifdef _WIN32_WCE
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td->thread_hnd = (HANDLE) CreateThread(NULL, 0,
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(LPTHREAD_START_ROUTINE) THREAD_FUNC,
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conn, 0, &td->thread_id);
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#else
|
|
td->thread_hnd = (HANDLE) _beginthreadex(NULL, 0, THREAD_FUNC,
|
|
conn, 0, &td->thread_id);
|
|
#endif
|
|
|
|
#ifdef CURLRES_IPV6
|
|
DEBUGASSERT(hints);
|
|
td->hints = *hints;
|
|
#else
|
|
(void) hints;
|
|
#endif
|
|
|
|
if (!td->thread_hnd) {
|
|
#ifdef _WIN32_WCE
|
|
TRACE(("CreateThread() failed; %s\n", Curl_strerror(conn, ERRNO)));
|
|
#else
|
|
SET_ERRNO(errno);
|
|
TRACE(("_beginthreadex() failed; %s\n", Curl_strerror(conn, ERRNO)));
|
|
#endif
|
|
Curl_destroy_thread_data(&conn->async);
|
|
return FALSE;
|
|
}
|
|
/* Waiting until the thread will initialize its data or it will exit due errors.
|
|
*/
|
|
thread_and_event[0] = td->thread_hnd;
|
|
thread_and_event[1] = td->event_thread_started;
|
|
if (WaitForMultipleObjects(sizeof(thread_and_event) /
|
|
sizeof(thread_and_event[0]),
|
|
(const HANDLE*)thread_and_event, FALSE,
|
|
INFINITE) == WAIT_FAILED) {
|
|
/* The resolver thread has been created,
|
|
* most probably it works now - ignoring this "minor" error
|
|
*/
|
|
}
|
|
/* This socket is only to keep Curl_resolv_fdset() and select() happy;
|
|
* should never become signalled for read/write since it's unbound but
|
|
* Windows needs atleast 1 socket in select().
|
|
*/
|
|
td->dummy_sock = socket(AF_INET, SOCK_DGRAM, 0);
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/*
|
|
* Curl_wait_for_resolv() waits for a resolve to finish. This function should
|
|
* be avoided since using this risk getting the multi interface to "hang".
|
|
*
|
|
* If 'entry' is non-NULL, make it point to the resolved dns entry
|
|
*
|
|
* This is the version for resolves-in-a-thread.
|
|
*/
|
|
CURLcode Curl_wait_for_resolv(struct connectdata *conn,
|
|
struct Curl_dns_entry **entry)
|
|
{
|
|
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
|
|
struct SessionHandle *data = conn->data;
|
|
long timeout;
|
|
DWORD status, ticks;
|
|
CURLcode rc;
|
|
|
|
DEBUGASSERT(conn && td);
|
|
|
|
/* now, see if there's a connect timeout or a regular timeout to
|
|
use instead of the default one */
|
|
timeout =
|
|
conn->data->set.connecttimeout ? conn->data->set.connecttimeout :
|
|
conn->data->set.timeout ? conn->data->set.timeout :
|
|
CURL_TIMEOUT_RESOLVE * 1000; /* default name resolve timeout */
|
|
ticks = GetTickCount();
|
|
|
|
/* wait for the thread to resolve the name */
|
|
status = WaitForSingleObject(td->event_resolved, timeout);
|
|
|
|
/* mark that we are now done waiting */
|
|
ReleaseMutex(td->mutex_waiting);
|
|
|
|
/* close our handle to the mutex, no point in hanging on to it */
|
|
CloseHandle(td->mutex_waiting);
|
|
td->mutex_waiting = NULL;
|
|
|
|
/* close the event handle, it's useless now */
|
|
CloseHandle(td->event_resolved);
|
|
td->event_resolved = NULL;
|
|
|
|
/* has the resolver thread succeeded in resolving our query ? */
|
|
if (status == WAIT_OBJECT_0) {
|
|
/* wait for the thread to exit, it's in the callback sequence */
|
|
if (WaitForSingleObject(td->thread_hnd, 5000) == WAIT_TIMEOUT) {
|
|
TerminateThread(td->thread_hnd, 0);
|
|
conn->async.done = TRUE;
|
|
td->thread_status = (DWORD)-1;
|
|
TRACE(("%s() thread stuck?!, ", THREAD_NAME));
|
|
}
|
|
else {
|
|
/* Thread finished before timeout; propagate Winsock error to this
|
|
* thread. 'conn->async.done = TRUE' is set in
|
|
* Curl_addrinfo4/6_callback().
|
|
*/
|
|
SET_SOCKERRNO(conn->async.status);
|
|
GetExitCodeThread(td->thread_hnd, &td->thread_status);
|
|
TRACE(("%s() status %lu, thread retval %lu, ",
|
|
THREAD_NAME, status, td->thread_status));
|
|
}
|
|
}
|
|
else {
|
|
conn->async.done = TRUE;
|
|
td->thread_status = (DWORD)-1;
|
|
TRACE(("%s() timeout, ", THREAD_NAME));
|
|
}
|
|
|
|
TRACE(("elapsed %lu ms\n", GetTickCount()-ticks));
|
|
|
|
if(entry)
|
|
*entry = conn->async.dns;
|
|
|
|
rc = CURLE_OK;
|
|
|
|
if (!conn->async.dns) {
|
|
/* a name was not resolved */
|
|
if (td->thread_status == CURLE_OUT_OF_MEMORY) {
|
|
rc = CURLE_OUT_OF_MEMORY;
|
|
failf(data, "Could not resolve host: %s", curl_easy_strerror(rc));
|
|
}
|
|
else if(conn->async.done) {
|
|
if(conn->bits.httpproxy) {
|
|
failf(data, "Could not resolve proxy: %s; %s",
|
|
conn->proxy.dispname, Curl_strerror(conn, conn->async.status));
|
|
rc = CURLE_COULDNT_RESOLVE_PROXY;
|
|
}
|
|
else {
|
|
failf(data, "Could not resolve host: %s; %s",
|
|
conn->host.name, Curl_strerror(conn, conn->async.status));
|
|
rc = CURLE_COULDNT_RESOLVE_HOST;
|
|
}
|
|
}
|
|
else if (td->thread_status == (DWORD)-1 || conn->async.status == NO_DATA) {
|
|
failf(data, "Resolving host timed out: %s", conn->host.name);
|
|
rc = CURLE_OPERATION_TIMEDOUT;
|
|
}
|
|
else
|
|
rc = CURLE_OPERATION_TIMEDOUT;
|
|
}
|
|
|
|
Curl_destroy_thread_data(&conn->async);
|
|
|
|
if(!conn->async.dns)
|
|
conn->bits.close = TRUE;
|
|
|
|
return (rc);
|
|
}
|
|
|
|
/*
|
|
* Curl_is_resolved() is called repeatedly to check if a previous name resolve
|
|
* request has completed. It should also make sure to time-out if the
|
|
* operation seems to take too long.
|
|
*/
|
|
CURLcode Curl_is_resolved(struct connectdata *conn,
|
|
struct Curl_dns_entry **entry)
|
|
{
|
|
*entry = NULL;
|
|
|
|
if (conn->async.done) {
|
|
/* we're done */
|
|
Curl_destroy_thread_data(&conn->async);
|
|
if (!conn->async.dns) {
|
|
TRACE(("Curl_is_resolved(): CURLE_COULDNT_RESOLVE_HOST\n"));
|
|
return CURLE_COULDNT_RESOLVE_HOST;
|
|
}
|
|
*entry = conn->async.dns;
|
|
TRACE(("resolved okay, dns %p\n", *entry));
|
|
}
|
|
return CURLE_OK;
|
|
}
|
|
|
|
int Curl_resolv_getsock(struct connectdata *conn,
|
|
curl_socket_t *socks,
|
|
int numsocks)
|
|
{
|
|
const struct thread_data *td =
|
|
(const struct thread_data *) conn->async.os_specific;
|
|
|
|
if (td && td->dummy_sock != CURL_SOCKET_BAD) {
|
|
if(numsocks) {
|
|
/* return one socket waiting for writable, even though this is just
|
|
a dummy */
|
|
socks[0] = td->dummy_sock;
|
|
return GETSOCK_WRITESOCK(0);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CURLRES_IPV4
|
|
/*
|
|
* Curl_getaddrinfo() - for Windows threading without ENABLE_IPV6.
|
|
*/
|
|
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
|
|
const char *hostname,
|
|
int port,
|
|
int *waitp)
|
|
{
|
|
struct hostent *h = NULL;
|
|
struct SessionHandle *data = conn->data;
|
|
in_addr_t in;
|
|
|
|
*waitp = 0; /* don't wait, we act synchronously */
|
|
|
|
in = inet_addr(hostname);
|
|
if (in != CURL_INADDR_NONE)
|
|
/* This is a dotted IP address 123.123.123.123-style */
|
|
return Curl_ip2addr(in, hostname, port);
|
|
|
|
/* fire up a new resolver thread! */
|
|
if (init_resolve_thread(conn, hostname, port, NULL)) {
|
|
*waitp = TRUE; /* please wait for the response */
|
|
return NULL;
|
|
}
|
|
|
|
/* fall-back to blocking version */
|
|
infof(data, "init_resolve_thread() failed for %s; %s\n",
|
|
hostname, Curl_strerror(conn, ERRNO));
|
|
|
|
h = gethostbyname(hostname);
|
|
if (!h) {
|
|
infof(data, "gethostbyname(2) failed for %s:%d; %s\n",
|
|
hostname, port, Curl_strerror(conn, SOCKERRNO));
|
|
return NULL;
|
|
}
|
|
return Curl_he2ai(h, port);
|
|
}
|
|
#endif /* CURLRES_IPV4 */
|
|
|
|
#ifdef CURLRES_IPV6
|
|
/*
|
|
* Curl_getaddrinfo() - for Windows threading IPv6 enabled
|
|
*/
|
|
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
|
|
const char *hostname,
|
|
int port,
|
|
int *waitp)
|
|
{
|
|
struct addrinfo hints, *res;
|
|
int error;
|
|
char sbuf[NI_MAXSERV];
|
|
curl_socket_t s;
|
|
int pf;
|
|
struct SessionHandle *data = conn->data;
|
|
|
|
*waitp = FALSE; /* default to synch response */
|
|
|
|
/* see if we have an IPv6 stack */
|
|
s = socket(PF_INET6, SOCK_DGRAM, 0);
|
|
if (s == CURL_SOCKET_BAD) {
|
|
/* Some non-IPv6 stacks have been found to make very slow name resolves
|
|
* when PF_UNSPEC is used, so thus we switch to a mere PF_INET lookup if
|
|
* the stack seems to be a non-ipv6 one. */
|
|
|
|
pf = PF_INET;
|
|
}
|
|
else {
|
|
/* This seems to be an IPv6-capable stack, use PF_UNSPEC for the widest
|
|
* possible checks. And close the socket again.
|
|
*/
|
|
sclose(s);
|
|
|
|
/*
|
|
* Check if a more limited name resolve has been requested.
|
|
*/
|
|
switch(data->set.ip_version) {
|
|
case CURL_IPRESOLVE_V4:
|
|
pf = PF_INET;
|
|
break;
|
|
case CURL_IPRESOLVE_V6:
|
|
pf = PF_INET6;
|
|
break;
|
|
default:
|
|
pf = PF_UNSPEC;
|
|
break;
|
|
}
|
|
}
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = pf;
|
|
hints.ai_socktype = conn->socktype;
|
|
#if 0 /* removed nov 8 2005 before 7.15.1 */
|
|
hints.ai_flags = AI_CANONNAME;
|
|
#endif
|
|
itoa(port, sbuf, 10);
|
|
|
|
/* fire up a new resolver thread! */
|
|
if (init_resolve_thread(conn, hostname, port, &hints)) {
|
|
*waitp = TRUE; /* please wait for the response */
|
|
return NULL;
|
|
}
|
|
|
|
/* fall-back to blocking version */
|
|
infof(data, "init_resolve_thread() failed for %s; %s\n",
|
|
hostname, Curl_strerror(conn, ERRNO));
|
|
|
|
error = getaddrinfo(hostname, sbuf, &hints, &res);
|
|
if (error) {
|
|
infof(data, "getaddrinfo() failed for %s:%d; %s\n",
|
|
hostname, port, Curl_strerror(conn, SOCKERRNO));
|
|
return NULL;
|
|
}
|
|
return res;
|
|
}
|
|
#endif /* CURLRES_IPV6 */
|
|
#endif /* CURLRES_THREADED */
|