[337] | 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 |
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| 23 | #include "curl_setup.h"
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| 24 |
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| 25 | /***********************************************************************
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| 26 | * Only for threaded name resolves builds
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| 27 | **********************************************************************/
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| 28 | #ifdef CURLRES_THREADED
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| 29 |
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| 30 | #ifdef HAVE_NETINET_IN_H
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| 31 | #include <netinet/in.h>
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| 32 | #endif
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| 33 | #ifdef HAVE_NETDB_H
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| 34 | #include <netdb.h>
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| 35 | #endif
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| 36 | #ifdef HAVE_ARPA_INET_H
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| 37 | #include <arpa/inet.h>
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| 38 | #endif
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| 39 | #ifdef __VMS
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| 40 | #include <in.h>
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| 41 | #include <inet.h>
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| 42 | #endif
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| 43 |
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| 44 | #if defined(USE_THREADS_POSIX)
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| 45 | # ifdef HAVE_PTHREAD_H
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| 46 | # include <pthread.h>
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| 47 | # endif
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| 48 | #elif defined(USE_THREADS_WIN32)
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| 49 | # ifdef HAVE_PROCESS_H
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| 50 | # include <process.h>
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| 51 | # endif
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| 52 | #endif
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| 53 |
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| 54 | #if (defined(NETWARE) && defined(__NOVELL_LIBC__))
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| 55 | #undef in_addr_t
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| 56 | #define in_addr_t unsigned long
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| 57 | #endif
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| 58 |
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| 59 | #ifdef HAVE_GETADDRINFO
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| 60 | # define RESOLVER_ENOMEM EAI_MEMORY
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| 61 | #else
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| 62 | # define RESOLVER_ENOMEM ENOMEM
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| 63 | #endif
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| 64 |
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| 65 | #include "urldata.h"
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| 66 | #include "sendf.h"
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| 67 | #include "hostip.h"
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| 68 | #include "hash.h"
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| 69 | #include "share.h"
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| 70 | #include "strerror.h"
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| 71 | #include "url.h"
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| 72 | #include "multiif.h"
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| 73 | #include "inet_pton.h"
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| 74 | #include "inet_ntop.h"
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| 75 | #include "curl_threads.h"
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| 76 | #include "connect.h"
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| 77 | /* The last 3 #include files should be in this order */
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| 78 | #include "curl_printf.h"
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| 79 | #include "curl_memory.h"
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| 80 | #include "memdebug.h"
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| 81 |
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| 82 | /*
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| 83 | * Curl_resolver_global_init()
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| 84 | * Called from curl_global_init() to initialize global resolver environment.
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| 85 | * Does nothing here.
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| 86 | */
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| 87 | int Curl_resolver_global_init(void)
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| 88 | {
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| 89 | return CURLE_OK;
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| 90 | }
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| 91 |
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| 92 | /*
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| 93 | * Curl_resolver_global_cleanup()
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| 94 | * Called from curl_global_cleanup() to destroy global resolver environment.
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| 95 | * Does nothing here.
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| 96 | */
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| 97 | void Curl_resolver_global_cleanup(void)
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| 98 | {
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| 99 | }
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| 100 |
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| 101 | /*
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| 102 | * Curl_resolver_init()
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| 103 | * Called from curl_easy_init() -> Curl_open() to initialize resolver
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| 104 | * URL-state specific environment ('resolver' member of the UrlState
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| 105 | * structure). Does nothing here.
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| 106 | */
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| 107 | CURLcode Curl_resolver_init(void **resolver)
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| 108 | {
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| 109 | (void)resolver;
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| 110 | return CURLE_OK;
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| 111 | }
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| 112 |
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| 113 | /*
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| 114 | * Curl_resolver_cleanup()
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| 115 | * Called from curl_easy_cleanup() -> Curl_close() to cleanup resolver
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| 116 | * URL-state specific environment ('resolver' member of the UrlState
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| 117 | * structure). Does nothing here.
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| 118 | */
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| 119 | void Curl_resolver_cleanup(void *resolver)
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| 120 | {
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| 121 | (void)resolver;
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| 122 | }
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| 123 |
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| 124 | /*
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| 125 | * Curl_resolver_duphandle()
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| 126 | * Called from curl_easy_duphandle() to duplicate resolver URL state-specific
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| 127 | * environment ('resolver' member of the UrlState structure). Does nothing
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| 128 | * here.
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| 129 | */
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| 130 | int Curl_resolver_duphandle(void **to, void *from)
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| 131 | {
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| 132 | (void)to;
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| 133 | (void)from;
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| 134 | return CURLE_OK;
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| 135 | }
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| 136 |
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| 137 | static void destroy_async_data(struct Curl_async *);
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| 138 |
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| 139 | /*
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| 140 | * Cancel all possibly still on-going resolves for this connection.
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| 141 | */
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| 142 | void Curl_resolver_cancel(struct connectdata *conn)
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| 143 | {
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| 144 | destroy_async_data(&conn->async);
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| 145 | }
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| 146 |
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| 147 | /* This function is used to init a threaded resolve */
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| 148 | static bool init_resolve_thread(struct connectdata *conn,
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| 149 | const char *hostname, int port,
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| 150 | const struct addrinfo *hints);
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| 151 |
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| 152 |
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| 153 | /* Data for synchronization between resolver thread and its parent */
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| 154 | struct thread_sync_data {
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| 155 | curl_mutex_t * mtx;
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| 156 | int done;
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| 157 |
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| 158 | char *hostname; /* hostname to resolve, Curl_async.hostname
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| 159 | duplicate */
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| 160 | int port;
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| 161 | int sock_error;
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| 162 | Curl_addrinfo *res;
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| 163 | #ifdef HAVE_GETADDRINFO
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| 164 | struct addrinfo hints;
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| 165 | #endif
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| 166 | struct thread_data *td; /* for thread-self cleanup */
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| 167 | };
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| 168 |
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| 169 | struct thread_data {
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| 170 | curl_thread_t thread_hnd;
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| 171 | unsigned int poll_interval;
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| 172 | time_t interval_end;
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| 173 | struct thread_sync_data tsd;
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| 174 | };
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| 175 |
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| 176 | static struct thread_sync_data *conn_thread_sync_data(struct connectdata *conn)
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| 177 | {
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| 178 | return &(((struct thread_data *)conn->async.os_specific)->tsd);
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| 179 | }
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| 180 |
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| 181 | #define CONN_THREAD_SYNC_DATA(conn) &(((conn)->async.os_specific)->tsd);
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| 182 |
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| 183 | /* Destroy resolver thread synchronization data */
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| 184 | static
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| 185 | void destroy_thread_sync_data(struct thread_sync_data * tsd)
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| 186 | {
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| 187 | if(tsd->mtx) {
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| 188 | Curl_mutex_destroy(tsd->mtx);
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| 189 | free(tsd->mtx);
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| 190 | }
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| 191 |
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| 192 | free(tsd->hostname);
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| 193 |
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| 194 | if(tsd->res)
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| 195 | Curl_freeaddrinfo(tsd->res);
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| 196 |
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| 197 | memset(tsd, 0, sizeof(*tsd));
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| 198 | }
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| 199 |
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| 200 | /* Initialize resolver thread synchronization data */
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| 201 | static
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| 202 | int init_thread_sync_data(struct thread_data * td,
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| 203 | const char *hostname,
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| 204 | int port,
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| 205 | const struct addrinfo *hints)
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| 206 | {
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| 207 | struct thread_sync_data *tsd = &td->tsd;
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| 208 |
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| 209 | memset(tsd, 0, sizeof(*tsd));
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| 210 |
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| 211 | tsd->td = td;
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| 212 | tsd->port = port;
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| 213 | /* Treat the request as done until the thread actually starts so any early
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| 214 | * cleanup gets done properly.
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| 215 | */
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| 216 | tsd->done = 1;
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| 217 | #ifdef HAVE_GETADDRINFO
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| 218 | DEBUGASSERT(hints);
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| 219 | tsd->hints = *hints;
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| 220 | #else
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| 221 | (void) hints;
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| 222 | #endif
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| 223 |
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| 224 | tsd->mtx = malloc(sizeof(curl_mutex_t));
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| 225 | if(tsd->mtx == NULL)
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| 226 | goto err_exit;
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| 227 |
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| 228 | Curl_mutex_init(tsd->mtx);
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| 229 |
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| 230 | tsd->sock_error = CURL_ASYNC_SUCCESS;
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| 231 |
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| 232 | /* Copying hostname string because original can be destroyed by parent
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| 233 | * thread during gethostbyname execution.
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| 234 | */
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| 235 | tsd->hostname = strdup(hostname);
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| 236 | if(!tsd->hostname)
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| 237 | goto err_exit;
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| 238 |
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| 239 | return 1;
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| 240 |
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| 241 | err_exit:
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| 242 | /* Memory allocation failed */
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| 243 | destroy_thread_sync_data(tsd);
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| 244 | return 0;
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| 245 | }
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| 246 |
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| 247 | static int getaddrinfo_complete(struct connectdata *conn)
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| 248 | {
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| 249 | struct thread_sync_data *tsd = conn_thread_sync_data(conn);
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| 250 | int rc;
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| 251 |
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| 252 | rc = Curl_addrinfo_callback(conn, tsd->sock_error, tsd->res);
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| 253 | /* The tsd->res structure has been copied to async.dns and perhaps the DNS
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| 254 | cache. Set our copy to NULL so destroy_thread_sync_data doesn't free it.
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| 255 | */
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| 256 | tsd->res = NULL;
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| 257 |
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| 258 | return rc;
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| 259 | }
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| 260 |
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| 261 |
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| 262 | #ifdef HAVE_GETADDRINFO
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| 263 |
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| 264 | /*
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| 265 | * getaddrinfo_thread() resolves a name and then exits.
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| 266 | *
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| 267 | * For builds without ARES, but with ENABLE_IPV6, create a resolver thread
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| 268 | * and wait on it.
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| 269 | */
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| 270 | static unsigned int CURL_STDCALL getaddrinfo_thread(void *arg)
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| 271 | {
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| 272 | struct thread_sync_data *tsd = (struct thread_sync_data*)arg;
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| 273 | struct thread_data *td = tsd->td;
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| 274 | char service[12];
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| 275 | int rc;
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| 276 |
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| 277 | snprintf(service, sizeof(service), "%d", tsd->port);
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| 278 |
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| 279 | rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);
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| 280 |
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| 281 | if(rc != 0) {
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| 282 | tsd->sock_error = SOCKERRNO?SOCKERRNO:rc;
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| 283 | if(tsd->sock_error == 0)
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| 284 | tsd->sock_error = RESOLVER_ENOMEM;
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| 285 | }
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| 286 | else {
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| 287 | Curl_addrinfo_set_port(tsd->res, tsd->port);
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| 288 | }
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| 289 |
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| 290 | Curl_mutex_acquire(tsd->mtx);
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| 291 | if(tsd->done) {
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| 292 | /* too late, gotta clean up the mess */
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| 293 | Curl_mutex_release(tsd->mtx);
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| 294 | destroy_thread_sync_data(tsd);
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| 295 | free(td);
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| 296 | }
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| 297 | else {
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| 298 | tsd->done = 1;
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| 299 | Curl_mutex_release(tsd->mtx);
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| 300 | }
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| 301 |
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| 302 | return 0;
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| 303 | }
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| 304 |
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| 305 | #else /* HAVE_GETADDRINFO */
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| 306 |
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| 307 | /*
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| 308 | * gethostbyname_thread() resolves a name and then exits.
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| 309 | */
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| 310 | static unsigned int CURL_STDCALL gethostbyname_thread(void *arg)
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| 311 | {
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| 312 | struct thread_sync_data *tsd = (struct thread_sync_data *)arg;
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| 313 | struct thread_data *td = tsd->td;
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| 314 |
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| 315 | tsd->res = Curl_ipv4_resolve_r(tsd->hostname, tsd->port);
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| 316 |
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| 317 | if(!tsd->res) {
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| 318 | tsd->sock_error = SOCKERRNO;
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| 319 | if(tsd->sock_error == 0)
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| 320 | tsd->sock_error = RESOLVER_ENOMEM;
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| 321 | }
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| 322 |
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| 323 | Curl_mutex_acquire(tsd->mtx);
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| 324 | if(tsd->done) {
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| 325 | /* too late, gotta clean up the mess */
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| 326 | Curl_mutex_release(tsd->mtx);
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| 327 | destroy_thread_sync_data(tsd);
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| 328 | free(td);
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| 329 | }
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| 330 | else {
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| 331 | tsd->done = 1;
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| 332 | Curl_mutex_release(tsd->mtx);
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| 333 | }
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| 334 |
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| 335 | return 0;
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| 336 | }
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| 337 |
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| 338 | #endif /* HAVE_GETADDRINFO */
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| 339 |
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| 340 | /*
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| 341 | * destroy_async_data() cleans up async resolver data and thread handle.
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| 342 | */
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| 343 | static void destroy_async_data(struct Curl_async *async)
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| 344 | {
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| 345 | if(async->os_specific) {
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| 346 | struct thread_data *td = (struct thread_data*) async->os_specific;
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| 347 | int done;
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| 348 |
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| 349 | /*
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| 350 | * if the thread is still blocking in the resolve syscall, detach it and
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| 351 | * let the thread do the cleanup...
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| 352 | */
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| 353 | Curl_mutex_acquire(td->tsd.mtx);
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| 354 | done = td->tsd.done;
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| 355 | td->tsd.done = 1;
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| 356 | Curl_mutex_release(td->tsd.mtx);
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| 357 |
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| 358 | if(!done) {
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| 359 | Curl_thread_destroy(td->thread_hnd);
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| 360 | }
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| 361 | else {
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| 362 | if(td->thread_hnd != curl_thread_t_null)
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| 363 | Curl_thread_join(&td->thread_hnd);
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| 364 |
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| 365 | destroy_thread_sync_data(&td->tsd);
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| 366 |
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| 367 | free(async->os_specific);
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| 368 | }
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| 369 | }
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| 370 | async->os_specific = NULL;
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| 371 |
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| 372 | free(async->hostname);
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| 373 | async->hostname = NULL;
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| 374 | }
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| 375 |
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| 376 | /*
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| 377 | * init_resolve_thread() starts a new thread that performs the actual
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| 378 | * resolve. This function returns before the resolve is done.
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| 379 | *
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| 380 | * Returns FALSE in case of failure, otherwise TRUE.
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| 381 | */
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| 382 | static bool init_resolve_thread(struct connectdata *conn,
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| 383 | const char *hostname, int port,
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| 384 | const struct addrinfo *hints)
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| 385 | {
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| 386 | struct thread_data *td = calloc(1, sizeof(struct thread_data));
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| 387 | int err = ENOMEM;
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| 388 |
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| 389 | conn->async.os_specific = (void *)td;
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| 390 | if(!td)
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| 391 | goto errno_exit;
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| 392 |
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| 393 | conn->async.port = port;
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| 394 | conn->async.done = FALSE;
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| 395 | conn->async.status = 0;
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| 396 | conn->async.dns = NULL;
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| 397 | td->thread_hnd = curl_thread_t_null;
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| 398 |
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| 399 | if(!init_thread_sync_data(td, hostname, port, hints)) {
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| 400 | conn->async.os_specific = NULL;
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| 401 | free(td);
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| 402 | goto errno_exit;
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| 403 | }
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| 404 |
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| 405 | free(conn->async.hostname);
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| 406 | conn->async.hostname = strdup(hostname);
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| 407 | if(!conn->async.hostname)
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| 408 | goto err_exit;
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| 409 |
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| 410 | /* The thread will set this to 1 when complete. */
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| 411 | td->tsd.done = 0;
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| 412 |
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| 413 | #ifdef HAVE_GETADDRINFO
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| 414 | td->thread_hnd = Curl_thread_create(getaddrinfo_thread, &td->tsd);
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| 415 | #else
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| 416 | td->thread_hnd = Curl_thread_create(gethostbyname_thread, &td->tsd);
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| 417 | #endif
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| 418 |
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| 419 | if(!td->thread_hnd) {
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| 420 | /* The thread never started, so mark it as done here for proper cleanup. */
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| 421 | td->tsd.done = 1;
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| 422 | err = errno;
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| 423 | goto err_exit;
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| 424 | }
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| 425 |
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| 426 | return TRUE;
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| 427 |
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| 428 | err_exit:
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| 429 | destroy_async_data(&conn->async);
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| 430 |
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| 431 | errno_exit:
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| 432 | errno = err;
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| 433 | return FALSE;
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| 434 | }
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| 435 |
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| 436 | /*
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| 437 | * resolver_error() calls failf() with the appropriate message after a resolve
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| 438 | * error
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| 439 | */
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| 440 |
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| 441 | static CURLcode resolver_error(struct connectdata *conn)
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| 442 | {
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| 443 | const char *host_or_proxy;
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| 444 | CURLcode result;
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| 445 |
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| 446 | if(conn->bits.httpproxy) {
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| 447 | host_or_proxy = "proxy";
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| 448 | result = CURLE_COULDNT_RESOLVE_PROXY;
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| 449 | }
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| 450 | else {
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| 451 | host_or_proxy = "host";
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| 452 | result = CURLE_COULDNT_RESOLVE_HOST;
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| 453 | }
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| 454 |
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| 455 | failf(conn->data, "Could not resolve %s: %s", host_or_proxy,
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| 456 | conn->async.hostname);
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| 457 |
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| 458 | return result;
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| 459 | }
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| 460 |
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| 461 | /*
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| 462 | * Curl_resolver_wait_resolv()
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| 463 | *
|
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| 464 | * waits for a resolve to finish. This function should be avoided since using
|
---|
| 465 | * this risk getting the multi interface to "hang".
|
---|
| 466 | *
|
---|
| 467 | * If 'entry' is non-NULL, make it point to the resolved dns entry
|
---|
| 468 | *
|
---|
| 469 | * This is the version for resolves-in-a-thread.
|
---|
| 470 | */
|
---|
| 471 | CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
|
---|
| 472 | struct Curl_dns_entry **entry)
|
---|
| 473 | {
|
---|
| 474 | struct thread_data *td = (struct thread_data*) conn->async.os_specific;
|
---|
| 475 | CURLcode result = CURLE_OK;
|
---|
| 476 |
|
---|
| 477 | DEBUGASSERT(conn && td);
|
---|
| 478 |
|
---|
| 479 | /* wait for the thread to resolve the name */
|
---|
| 480 | if(Curl_thread_join(&td->thread_hnd))
|
---|
| 481 | result = getaddrinfo_complete(conn);
|
---|
| 482 | else
|
---|
| 483 | DEBUGASSERT(0);
|
---|
| 484 |
|
---|
| 485 | conn->async.done = TRUE;
|
---|
| 486 |
|
---|
| 487 | if(entry)
|
---|
| 488 | *entry = conn->async.dns;
|
---|
| 489 |
|
---|
| 490 | if(!conn->async.dns)
|
---|
| 491 | /* a name was not resolved, report error */
|
---|
| 492 | result = resolver_error(conn);
|
---|
| 493 |
|
---|
| 494 | destroy_async_data(&conn->async);
|
---|
| 495 |
|
---|
| 496 | if(!conn->async.dns)
|
---|
| 497 | connclose(conn, "asynch resolve failed");
|
---|
| 498 |
|
---|
| 499 | return result;
|
---|
| 500 | }
|
---|
| 501 |
|
---|
| 502 | /*
|
---|
| 503 | * Curl_resolver_is_resolved() is called repeatedly to check if a previous
|
---|
| 504 | * name resolve request has completed. It should also make sure to time-out if
|
---|
| 505 | * the operation seems to take too long.
|
---|
| 506 | */
|
---|
| 507 | CURLcode Curl_resolver_is_resolved(struct connectdata *conn,
|
---|
| 508 | struct Curl_dns_entry **entry)
|
---|
| 509 | {
|
---|
| 510 | struct Curl_easy *data = conn->data;
|
---|
| 511 | struct thread_data *td = (struct thread_data*) conn->async.os_specific;
|
---|
| 512 | int done = 0;
|
---|
| 513 |
|
---|
| 514 | *entry = NULL;
|
---|
| 515 |
|
---|
| 516 | if(!td) {
|
---|
| 517 | DEBUGASSERT(td);
|
---|
| 518 | return CURLE_COULDNT_RESOLVE_HOST;
|
---|
| 519 | }
|
---|
| 520 |
|
---|
| 521 | Curl_mutex_acquire(td->tsd.mtx);
|
---|
| 522 | done = td->tsd.done;
|
---|
| 523 | Curl_mutex_release(td->tsd.mtx);
|
---|
| 524 |
|
---|
| 525 | if(done) {
|
---|
| 526 | getaddrinfo_complete(conn);
|
---|
| 527 |
|
---|
| 528 | if(!conn->async.dns) {
|
---|
| 529 | CURLcode result = resolver_error(conn);
|
---|
| 530 | destroy_async_data(&conn->async);
|
---|
| 531 | return result;
|
---|
| 532 | }
|
---|
| 533 | destroy_async_data(&conn->async);
|
---|
| 534 | *entry = conn->async.dns;
|
---|
| 535 | }
|
---|
| 536 | else {
|
---|
| 537 | /* poll for name lookup done with exponential backoff up to 250ms */
|
---|
| 538 | timediff_t elapsed = Curl_timediff(Curl_now(),
|
---|
| 539 | data->progress.t_startsingle);
|
---|
| 540 | if(elapsed < 0)
|
---|
| 541 | elapsed = 0;
|
---|
| 542 |
|
---|
| 543 | if(td->poll_interval == 0)
|
---|
| 544 | /* Start at 1ms poll interval */
|
---|
| 545 | td->poll_interval = 1;
|
---|
| 546 | else if(elapsed >= td->interval_end)
|
---|
| 547 | /* Back-off exponentially if last interval expired */
|
---|
| 548 | td->poll_interval *= 2;
|
---|
| 549 |
|
---|
| 550 | if(td->poll_interval > 250)
|
---|
| 551 | td->poll_interval = 250;
|
---|
| 552 |
|
---|
| 553 | td->interval_end = elapsed + td->poll_interval;
|
---|
| 554 | Curl_expire(conn->data, td->poll_interval, EXPIRE_ASYNC_NAME);
|
---|
| 555 | }
|
---|
| 556 |
|
---|
| 557 | return CURLE_OK;
|
---|
| 558 | }
|
---|
| 559 |
|
---|
| 560 | int Curl_resolver_getsock(struct connectdata *conn,
|
---|
| 561 | curl_socket_t *socks,
|
---|
| 562 | int numsocks)
|
---|
| 563 | {
|
---|
| 564 | (void)conn;
|
---|
| 565 | (void)socks;
|
---|
| 566 | (void)numsocks;
|
---|
| 567 | return 0;
|
---|
| 568 | }
|
---|
| 569 |
|
---|
| 570 | #ifndef HAVE_GETADDRINFO
|
---|
| 571 | /*
|
---|
| 572 | * Curl_getaddrinfo() - for platforms without getaddrinfo
|
---|
| 573 | */
|
---|
| 574 | Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
|
---|
| 575 | const char *hostname,
|
---|
| 576 | int port,
|
---|
| 577 | int *waitp)
|
---|
| 578 | {
|
---|
| 579 | struct in_addr in;
|
---|
| 580 |
|
---|
| 581 | *waitp = 0; /* default to synchronous response */
|
---|
| 582 |
|
---|
| 583 | if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
|
---|
| 584 | /* This is a dotted IP address 123.123.123.123-style */
|
---|
| 585 | return Curl_ip2addr(AF_INET, &in, hostname, port);
|
---|
| 586 |
|
---|
| 587 | /* fire up a new resolver thread! */
|
---|
| 588 | if(init_resolve_thread(conn, hostname, port, NULL)) {
|
---|
| 589 | *waitp = 1; /* expect asynchronous response */
|
---|
| 590 | return NULL;
|
---|
| 591 | }
|
---|
| 592 |
|
---|
| 593 | /* fall-back to blocking version */
|
---|
| 594 | return Curl_ipv4_resolve_r(hostname, port);
|
---|
| 595 | }
|
---|
| 596 |
|
---|
| 597 | #else /* !HAVE_GETADDRINFO */
|
---|
| 598 |
|
---|
| 599 | /*
|
---|
| 600 | * Curl_resolver_getaddrinfo() - for getaddrinfo
|
---|
| 601 | */
|
---|
| 602 | Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
|
---|
| 603 | const char *hostname,
|
---|
| 604 | int port,
|
---|
| 605 | int *waitp)
|
---|
| 606 | {
|
---|
| 607 | struct addrinfo hints;
|
---|
| 608 | Curl_addrinfo *res;
|
---|
| 609 | int error;
|
---|
| 610 | char sbuf[12];
|
---|
| 611 | int pf = PF_INET;
|
---|
| 612 |
|
---|
| 613 | *waitp = 0; /* default to synchronous response */
|
---|
| 614 |
|
---|
| 615 | #ifndef USE_RESOLVE_ON_IPS
|
---|
| 616 | {
|
---|
| 617 | struct in_addr in;
|
---|
| 618 | /* First check if this is an IPv4 address string */
|
---|
| 619 | if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
|
---|
| 620 | /* This is a dotted IP address 123.123.123.123-style */
|
---|
| 621 | return Curl_ip2addr(AF_INET, &in, hostname, port);
|
---|
| 622 | }
|
---|
| 623 | #ifdef CURLRES_IPV6
|
---|
| 624 | {
|
---|
| 625 | struct in6_addr in6;
|
---|
| 626 | /* check if this is an IPv6 address string */
|
---|
| 627 | if(Curl_inet_pton(AF_INET6, hostname, &in6) > 0)
|
---|
| 628 | /* This is an IPv6 address literal */
|
---|
| 629 | return Curl_ip2addr(AF_INET6, &in6, hostname, port);
|
---|
| 630 | }
|
---|
| 631 | #endif /* CURLRES_IPV6 */
|
---|
| 632 | #endif /* !USE_RESOLVE_ON_IPS */
|
---|
| 633 |
|
---|
| 634 | #ifdef CURLRES_IPV6
|
---|
| 635 | /*
|
---|
| 636 | * Check if a limited name resolve has been requested.
|
---|
| 637 | */
|
---|
| 638 | switch(conn->ip_version) {
|
---|
| 639 | case CURL_IPRESOLVE_V4:
|
---|
| 640 | pf = PF_INET;
|
---|
| 641 | break;
|
---|
| 642 | case CURL_IPRESOLVE_V6:
|
---|
| 643 | pf = PF_INET6;
|
---|
| 644 | break;
|
---|
| 645 | default:
|
---|
| 646 | pf = PF_UNSPEC;
|
---|
| 647 | break;
|
---|
| 648 | }
|
---|
| 649 |
|
---|
| 650 | if((pf != PF_INET) && !Curl_ipv6works())
|
---|
| 651 | /* The stack seems to be a non-IPv6 one */
|
---|
| 652 | pf = PF_INET;
|
---|
| 653 | #endif /* CURLRES_IPV6 */
|
---|
| 654 |
|
---|
| 655 | memset(&hints, 0, sizeof(hints));
|
---|
| 656 | hints.ai_family = pf;
|
---|
| 657 | hints.ai_socktype = conn->socktype;
|
---|
| 658 |
|
---|
| 659 | snprintf(sbuf, sizeof(sbuf), "%d", port);
|
---|
| 660 |
|
---|
| 661 | /* fire up a new resolver thread! */
|
---|
| 662 | if(init_resolve_thread(conn, hostname, port, &hints)) {
|
---|
| 663 | *waitp = 1; /* expect asynchronous response */
|
---|
| 664 | return NULL;
|
---|
| 665 | }
|
---|
| 666 |
|
---|
| 667 | /* fall-back to blocking version */
|
---|
| 668 | infof(conn->data, "init_resolve_thread() failed for %s; %s\n",
|
---|
| 669 | hostname, Curl_strerror(conn, errno));
|
---|
| 670 |
|
---|
| 671 | error = Curl_getaddrinfo_ex(hostname, sbuf, &hints, &res);
|
---|
| 672 | if(error) {
|
---|
| 673 | infof(conn->data, "getaddrinfo() failed for %s:%d; %s\n",
|
---|
| 674 | hostname, port, Curl_strerror(conn, SOCKERRNO));
|
---|
| 675 | return NULL;
|
---|
| 676 | }
|
---|
| 677 | else {
|
---|
| 678 | Curl_addrinfo_set_port(res, port);
|
---|
| 679 | }
|
---|
| 680 |
|
---|
| 681 | return res;
|
---|
| 682 | }
|
---|
| 683 |
|
---|
| 684 | #endif /* !HAVE_GETADDRINFO */
|
---|
| 685 |
|
---|
| 686 | CURLcode Curl_set_dns_servers(struct Curl_easy *data,
|
---|
| 687 | char *servers)
|
---|
| 688 | {
|
---|
| 689 | (void)data;
|
---|
| 690 | (void)servers;
|
---|
| 691 | return CURLE_NOT_BUILT_IN;
|
---|
| 692 |
|
---|
| 693 | }
|
---|
| 694 |
|
---|
| 695 | CURLcode Curl_set_dns_interface(struct Curl_easy *data,
|
---|
| 696 | const char *interf)
|
---|
| 697 | {
|
---|
| 698 | (void)data;
|
---|
| 699 | (void)interf;
|
---|
| 700 | return CURLE_NOT_BUILT_IN;
|
---|
| 701 | }
|
---|
| 702 |
|
---|
| 703 | CURLcode Curl_set_dns_local_ip4(struct Curl_easy *data,
|
---|
| 704 | const char *local_ip4)
|
---|
| 705 | {
|
---|
| 706 | (void)data;
|
---|
| 707 | (void)local_ip4;
|
---|
| 708 | return CURLE_NOT_BUILT_IN;
|
---|
| 709 | }
|
---|
| 710 |
|
---|
| 711 | CURLcode Curl_set_dns_local_ip6(struct Curl_easy *data,
|
---|
| 712 | const char *local_ip6)
|
---|
| 713 | {
|
---|
| 714 | (void)data;
|
---|
| 715 | (void)local_ip6;
|
---|
| 716 | return CURLE_NOT_BUILT_IN;
|
---|
| 717 | }
|
---|
| 718 |
|
---|
| 719 | #endif /* CURLRES_THREADED */
|
---|