[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 ares-enabled builds
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| 27 | * And only for functions that fulfill the asynch resolver backend API
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| 28 | * as defined in asyn.h, nothing else belongs in this file!
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| 29 | **********************************************************************/
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| 30 |
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| 31 | #ifdef CURLRES_ARES
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| 32 |
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| 33 | #ifdef HAVE_LIMITS_H
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| 34 | #include <limits.h>
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| 35 | #endif
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| 36 | #ifdef HAVE_NETINET_IN_H
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| 37 | #include <netinet/in.h>
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| 38 | #endif
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| 39 | #ifdef HAVE_NETDB_H
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| 40 | #include <netdb.h>
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| 41 | #endif
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| 42 | #ifdef HAVE_ARPA_INET_H
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| 43 | #include <arpa/inet.h>
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| 44 | #endif
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| 45 | #ifdef __VMS
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| 46 | #include <in.h>
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| 47 | #include <inet.h>
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| 48 | #endif
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| 49 |
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| 50 | #ifdef HAVE_PROCESS_H
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| 51 | #include <process.h>
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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 | #include "urldata.h"
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| 60 | #include "sendf.h"
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| 61 | #include "hostip.h"
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| 62 | #include "hash.h"
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| 63 | #include "share.h"
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| 64 | #include "strerror.h"
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| 65 | #include "url.h"
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| 66 | #include "multiif.h"
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| 67 | #include "inet_pton.h"
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| 68 | #include "connect.h"
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| 69 | #include "select.h"
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| 70 | #include "progress.h"
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| 71 |
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| 72 | # if defined(CURL_STATICLIB) && !defined(CARES_STATICLIB) && \
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| 73 | (defined(WIN32) || defined(_WIN32) || defined(__SYMBIAN32__))
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| 74 | # define CARES_STATICLIB
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| 75 | # endif
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| 76 | # include <ares.h>
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| 77 | # include <ares_version.h> /* really old c-ares didn't include this by
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| 78 | itself */
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| 79 |
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| 80 | #if ARES_VERSION >= 0x010500
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| 81 | /* c-ares 1.5.0 or later, the callback proto is modified */
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| 82 | #define HAVE_CARES_CALLBACK_TIMEOUTS 1
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| 83 | #endif
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| 84 |
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| 85 | /* The last 3 #include files should be in this order */
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| 86 | #include "curl_printf.h"
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| 87 | #include "curl_memory.h"
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| 88 | #include "memdebug.h"
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| 89 |
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| 90 | struct ResolverResults {
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| 91 | int num_pending; /* number of ares_gethostbyname() requests */
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| 92 | Curl_addrinfo *temp_ai; /* intermediary result while fetching c-ares parts */
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| 93 | int last_status;
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| 94 | };
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| 95 |
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| 96 | /*
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| 97 | * Curl_resolver_global_init() - the generic low-level asynchronous name
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| 98 | * resolve API. Called from curl_global_init() to initialize global resolver
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| 99 | * environment. Initializes ares library.
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| 100 | */
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| 101 | int Curl_resolver_global_init(void)
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| 102 | {
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| 103 | #ifdef CARES_HAVE_ARES_LIBRARY_INIT
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| 104 | if(ares_library_init(ARES_LIB_INIT_ALL)) {
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| 105 | return CURLE_FAILED_INIT;
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| 106 | }
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| 107 | #endif
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| 108 | return CURLE_OK;
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| 109 | }
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| 110 |
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| 111 | /*
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| 112 | * Curl_resolver_global_cleanup()
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| 113 | *
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| 114 | * Called from curl_global_cleanup() to destroy global resolver environment.
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| 115 | * Deinitializes ares library.
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| 116 | */
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| 117 | void Curl_resolver_global_cleanup(void)
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| 118 | {
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| 119 | #ifdef CARES_HAVE_ARES_LIBRARY_CLEANUP
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| 120 | ares_library_cleanup();
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| 121 | #endif
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| 122 | }
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| 123 |
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| 124 | /*
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| 125 | * Curl_resolver_init()
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| 126 | *
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| 127 | * Called from curl_easy_init() -> Curl_open() to initialize resolver
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| 128 | * URL-state specific environment ('resolver' member of the UrlState
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| 129 | * structure). Fills the passed pointer by the initialized ares_channel.
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| 130 | */
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| 131 | CURLcode Curl_resolver_init(void **resolver)
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| 132 | {
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| 133 | int status = ares_init((ares_channel*)resolver);
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| 134 | if(status != ARES_SUCCESS) {
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| 135 | if(status == ARES_ENOMEM)
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| 136 | return CURLE_OUT_OF_MEMORY;
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| 137 | else
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| 138 | return CURLE_FAILED_INIT;
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| 139 | }
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| 140 | return CURLE_OK;
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| 141 | /* make sure that all other returns from this function should destroy the
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| 142 | ares channel before returning error! */
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| 143 | }
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| 144 |
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| 145 | /*
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| 146 | * Curl_resolver_cleanup()
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| 147 | *
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| 148 | * Called from curl_easy_cleanup() -> Curl_close() to cleanup resolver
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| 149 | * URL-state specific environment ('resolver' member of the UrlState
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| 150 | * structure). Destroys the ares channel.
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| 151 | */
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| 152 | void Curl_resolver_cleanup(void *resolver)
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| 153 | {
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| 154 | ares_destroy((ares_channel)resolver);
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| 155 | }
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| 156 |
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| 157 | /*
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| 158 | * Curl_resolver_duphandle()
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| 159 | *
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| 160 | * Called from curl_easy_duphandle() to duplicate resolver URL-state specific
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| 161 | * environment ('resolver' member of the UrlState structure). Duplicates the
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| 162 | * 'from' ares channel and passes the resulting channel to the 'to' pointer.
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| 163 | */
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| 164 | int Curl_resolver_duphandle(void **to, void *from)
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| 165 | {
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| 166 | /* Clone the ares channel for the new handle */
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| 167 | if(ARES_SUCCESS != ares_dup((ares_channel*)to, (ares_channel)from))
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| 168 | return CURLE_FAILED_INIT;
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| 169 | return CURLE_OK;
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| 170 | }
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| 171 |
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| 172 | static void destroy_async_data(struct Curl_async *async);
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| 173 |
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| 174 | /*
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| 175 | * Cancel all possibly still on-going resolves for this connection.
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| 176 | */
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| 177 | void Curl_resolver_cancel(struct connectdata *conn)
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| 178 | {
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| 179 | if(conn->data && conn->data->state.resolver)
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| 180 | ares_cancel((ares_channel)conn->data->state.resolver);
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| 181 | destroy_async_data(&conn->async);
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| 182 | }
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| 183 |
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| 184 | /*
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| 185 | * destroy_async_data() cleans up async resolver data.
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| 186 | */
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| 187 | static void destroy_async_data(struct Curl_async *async)
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| 188 | {
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| 189 | free(async->hostname);
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| 190 |
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| 191 | if(async->os_specific) {
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| 192 | struct ResolverResults *res = (struct ResolverResults *)async->os_specific;
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| 193 | if(res) {
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| 194 | if(res->temp_ai) {
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| 195 | Curl_freeaddrinfo(res->temp_ai);
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| 196 | res->temp_ai = NULL;
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| 197 | }
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| 198 | free(res);
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| 199 | }
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| 200 | async->os_specific = NULL;
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| 201 | }
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| 202 |
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| 203 | async->hostname = NULL;
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| 204 | }
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| 205 |
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| 206 | /*
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| 207 | * Curl_resolver_getsock() is called when someone from the outside world
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| 208 | * (using curl_multi_fdset()) wants to get our fd_set setup and we're talking
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| 209 | * with ares. The caller must make sure that this function is only called when
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| 210 | * we have a working ares channel.
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| 211 | *
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| 212 | * Returns: sockets-in-use-bitmap
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| 213 | */
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| 214 |
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| 215 | int Curl_resolver_getsock(struct connectdata *conn,
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| 216 | curl_socket_t *socks,
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| 217 | int numsocks)
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| 218 |
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| 219 | {
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| 220 | struct timeval maxtime;
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| 221 | struct timeval timebuf;
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| 222 | struct timeval *timeout;
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| 223 | long milli;
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| 224 | int max = ares_getsock((ares_channel)conn->data->state.resolver,
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| 225 | (ares_socket_t *)socks, numsocks);
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| 226 |
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| 227 | maxtime.tv_sec = CURL_TIMEOUT_RESOLVE;
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| 228 | maxtime.tv_usec = 0;
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| 229 |
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| 230 | timeout = ares_timeout((ares_channel)conn->data->state.resolver, &maxtime,
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| 231 | &timebuf);
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| 232 | milli = (timeout->tv_sec * 1000) + (timeout->tv_usec/1000);
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| 233 | if(milli == 0)
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| 234 | milli += 10;
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| 235 | Curl_expire(conn->data, milli, EXPIRE_ASYNC_NAME);
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| 236 |
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| 237 | return max;
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| 238 | }
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| 239 |
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| 240 | /*
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| 241 | * waitperform()
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| 242 | *
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| 243 | * 1) Ask ares what sockets it currently plays with, then
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| 244 | * 2) wait for the timeout period to check for action on ares' sockets.
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| 245 | * 3) tell ares to act on all the sockets marked as "with action"
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| 246 | *
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| 247 | * return number of sockets it worked on
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| 248 | */
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| 249 |
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| 250 | static int waitperform(struct connectdata *conn, int timeout_ms)
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| 251 | {
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| 252 | struct Curl_easy *data = conn->data;
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| 253 | int nfds;
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| 254 | int bitmask;
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| 255 | ares_socket_t socks[ARES_GETSOCK_MAXNUM];
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| 256 | struct pollfd pfd[ARES_GETSOCK_MAXNUM];
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| 257 | int i;
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| 258 | int num = 0;
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| 259 |
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| 260 | bitmask = ares_getsock((ares_channel)data->state.resolver, socks,
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| 261 | ARES_GETSOCK_MAXNUM);
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| 262 |
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| 263 | for(i = 0; i < ARES_GETSOCK_MAXNUM; i++) {
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| 264 | pfd[i].events = 0;
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| 265 | pfd[i].revents = 0;
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| 266 | if(ARES_GETSOCK_READABLE(bitmask, i)) {
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| 267 | pfd[i].fd = socks[i];
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| 268 | pfd[i].events |= POLLRDNORM|POLLIN;
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| 269 | }
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| 270 | if(ARES_GETSOCK_WRITABLE(bitmask, i)) {
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| 271 | pfd[i].fd = socks[i];
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| 272 | pfd[i].events |= POLLWRNORM|POLLOUT;
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| 273 | }
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| 274 | if(pfd[i].events != 0)
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| 275 | num++;
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| 276 | else
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| 277 | break;
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| 278 | }
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| 279 |
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| 280 | if(num)
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| 281 | nfds = Curl_poll(pfd, num, timeout_ms);
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| 282 | else
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| 283 | nfds = 0;
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| 284 |
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| 285 | if(!nfds)
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| 286 | /* Call ares_process() unconditonally here, even if we simply timed out
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| 287 | above, as otherwise the ares name resolve won't timeout! */
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| 288 | ares_process_fd((ares_channel)data->state.resolver, ARES_SOCKET_BAD,
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| 289 | ARES_SOCKET_BAD);
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| 290 | else {
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| 291 | /* move through the descriptors and ask for processing on them */
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| 292 | for(i = 0; i < num; i++)
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| 293 | ares_process_fd((ares_channel)data->state.resolver,
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| 294 | pfd[i].revents & (POLLRDNORM|POLLIN)?
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| 295 | pfd[i].fd:ARES_SOCKET_BAD,
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| 296 | pfd[i].revents & (POLLWRNORM|POLLOUT)?
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| 297 | pfd[i].fd:ARES_SOCKET_BAD);
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| 298 | }
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| 299 | return nfds;
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| 300 | }
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| 301 |
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| 302 | /*
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| 303 | * Curl_resolver_is_resolved() is called repeatedly to check if a previous
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| 304 | * name resolve request has completed. It should also make sure to time-out if
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| 305 | * the operation seems to take too long.
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| 306 | *
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| 307 | * Returns normal CURLcode errors.
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| 308 | */
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| 309 | CURLcode Curl_resolver_is_resolved(struct connectdata *conn,
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| 310 | struct Curl_dns_entry **dns)
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| 311 | {
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| 312 | struct Curl_easy *data = conn->data;
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| 313 | struct ResolverResults *res = (struct ResolverResults *)
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| 314 | conn->async.os_specific;
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| 315 | CURLcode result = CURLE_OK;
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| 316 |
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| 317 | *dns = NULL;
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| 318 |
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| 319 | waitperform(conn, 0);
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| 320 |
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| 321 | if(res && !res->num_pending) {
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| 322 | (void)Curl_addrinfo_callback(conn, res->last_status, res->temp_ai);
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| 323 | /* temp_ai ownership is moved to the connection, so we need not free-up
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| 324 | them */
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| 325 | res->temp_ai = NULL;
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| 326 | if(!conn->async.dns) {
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| 327 | failf(data, "Could not resolve: %s (%s)",
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| 328 | conn->async.hostname, ares_strerror(conn->async.status));
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| 329 | result = conn->bits.proxy?CURLE_COULDNT_RESOLVE_PROXY:
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| 330 | CURLE_COULDNT_RESOLVE_HOST;
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| 331 | }
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| 332 | else
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| 333 | *dns = conn->async.dns;
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| 334 |
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| 335 | destroy_async_data(&conn->async);
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| 336 | }
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| 337 |
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| 338 | return result;
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| 339 | }
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| 340 |
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| 341 | /*
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| 342 | * Curl_resolver_wait_resolv()
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| 343 | *
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| 344 | * waits for a resolve to finish. This function should be avoided since using
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| 345 | * this risk getting the multi interface to "hang".
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| 346 | *
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| 347 | * If 'entry' is non-NULL, make it point to the resolved dns entry
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| 348 | *
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| 349 | * Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved, and
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| 350 | * CURLE_OPERATION_TIMEDOUT if a time-out occurred.
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| 351 | */
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| 352 | CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
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| 353 | struct Curl_dns_entry **entry)
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| 354 | {
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| 355 | CURLcode result = CURLE_OK;
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| 356 | struct Curl_easy *data = conn->data;
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| 357 | timediff_t timeout;
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| 358 | struct curltime now = Curl_now();
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| 359 | struct Curl_dns_entry *temp_entry;
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| 360 |
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| 361 | if(entry)
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| 362 | *entry = NULL; /* clear on entry */
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| 363 |
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| 364 | timeout = Curl_timeleft(data, &now, TRUE);
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| 365 | if(timeout < 0) {
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| 366 | /* already expired! */
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| 367 | connclose(conn, "Timed out before name resolve started");
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| 368 | return CURLE_OPERATION_TIMEDOUT;
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| 369 | }
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| 370 | if(!timeout)
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| 371 | timeout = CURL_TIMEOUT_RESOLVE * 1000; /* default name resolve timeout */
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| 372 |
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| 373 | /* Wait for the name resolve query to complete. */
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| 374 | while(!result) {
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| 375 | struct timeval *tvp, tv, store;
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| 376 | int itimeout;
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| 377 | int timeout_ms;
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| 378 |
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| 379 | itimeout = (timeout > (long)INT_MAX) ? INT_MAX : (int)timeout;
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| 380 |
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| 381 | store.tv_sec = itimeout/1000;
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| 382 | store.tv_usec = (itimeout%1000)*1000;
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| 383 |
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| 384 | tvp = ares_timeout((ares_channel)data->state.resolver, &store, &tv);
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| 385 |
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| 386 | /* use the timeout period ares returned to us above if less than one
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| 387 | second is left, otherwise just use 1000ms to make sure the progress
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| 388 | callback gets called frequent enough */
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| 389 | if(!tvp->tv_sec)
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| 390 | timeout_ms = (int)(tvp->tv_usec/1000);
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| 391 | else
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| 392 | timeout_ms = 1000;
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| 393 |
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| 394 | waitperform(conn, timeout_ms);
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| 395 | result = Curl_resolver_is_resolved(conn, &temp_entry);
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| 396 |
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| 397 | if(result || conn->async.done)
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| 398 | break;
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| 399 |
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| 400 | if(Curl_pgrsUpdate(conn))
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| 401 | result = CURLE_ABORTED_BY_CALLBACK;
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| 402 | else {
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| 403 | struct curltime now2 = Curl_now();
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| 404 | timediff_t timediff = Curl_timediff(now2, now); /* spent time */
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| 405 | if(timediff <= 0)
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| 406 | timeout -= 1; /* always deduct at least 1 */
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| 407 | else if(timediff > timeout)
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| 408 | timeout = -1;
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| 409 | else
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| 410 | timeout -= (long)timediff;
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| 411 | now = now2; /* for next loop */
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| 412 | }
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| 413 | if(timeout < 0)
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| 414 | result = CURLE_OPERATION_TIMEDOUT;
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| 415 | }
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| 416 | if(result)
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| 417 | /* failure, so we cancel the ares operation */
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| 418 | ares_cancel((ares_channel)data->state.resolver);
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| 419 |
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| 420 | /* Operation complete, if the lookup was successful we now have the entry
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| 421 | in the cache. */
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| 422 | if(entry)
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| 423 | *entry = conn->async.dns;
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| 424 |
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| 425 | if(result)
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| 426 | /* close the connection, since we can't return failure here without
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| 427 | cleaning up this connection properly.
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| 428 | TODO: remove this action from here, it is not a name resolver decision.
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| 429 | */
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| 430 | connclose(conn, "c-ares resolve failed");
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| 431 |
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| 432 | return result;
|
---|
| 433 | }
|
---|
| 434 |
|
---|
| 435 | /* Connects results to the list */
|
---|
| 436 | static void compound_results(struct ResolverResults *res,
|
---|
| 437 | Curl_addrinfo *ai)
|
---|
| 438 | {
|
---|
| 439 | Curl_addrinfo *ai_tail;
|
---|
| 440 | if(!ai)
|
---|
| 441 | return;
|
---|
| 442 | ai_tail = ai;
|
---|
| 443 |
|
---|
| 444 | while(ai_tail->ai_next)
|
---|
| 445 | ai_tail = ai_tail->ai_next;
|
---|
| 446 |
|
---|
| 447 | /* Add the new results to the list of old results. */
|
---|
| 448 | ai_tail->ai_next = res->temp_ai;
|
---|
| 449 | res->temp_ai = ai;
|
---|
| 450 | }
|
---|
| 451 |
|
---|
| 452 | /*
|
---|
| 453 | * ares_query_completed_cb() is the callback that ares will call when
|
---|
| 454 | * the host query initiated by ares_gethostbyname() from Curl_getaddrinfo(),
|
---|
| 455 | * when using ares, is completed either successfully or with failure.
|
---|
| 456 | */
|
---|
| 457 | static void query_completed_cb(void *arg, /* (struct connectdata *) */
|
---|
| 458 | int status,
|
---|
| 459 | #ifdef HAVE_CARES_CALLBACK_TIMEOUTS
|
---|
| 460 | int timeouts,
|
---|
| 461 | #endif
|
---|
| 462 | struct hostent *hostent)
|
---|
| 463 | {
|
---|
| 464 | struct connectdata *conn = (struct connectdata *)arg;
|
---|
| 465 | struct ResolverResults *res;
|
---|
| 466 |
|
---|
| 467 | #ifdef HAVE_CARES_CALLBACK_TIMEOUTS
|
---|
| 468 | (void)timeouts; /* ignored */
|
---|
| 469 | #endif
|
---|
| 470 |
|
---|
| 471 | if(ARES_EDESTRUCTION == status)
|
---|
| 472 | /* when this ares handle is getting destroyed, the 'arg' pointer may not
|
---|
| 473 | be valid so only defer it when we know the 'status' says its fine! */
|
---|
| 474 | return;
|
---|
| 475 |
|
---|
| 476 | res = (struct ResolverResults *)conn->async.os_specific;
|
---|
| 477 | res->num_pending--;
|
---|
| 478 |
|
---|
| 479 | if(CURL_ASYNC_SUCCESS == status) {
|
---|
| 480 | Curl_addrinfo *ai = Curl_he2ai(hostent, conn->async.port);
|
---|
| 481 | if(ai) {
|
---|
| 482 | compound_results(res, ai);
|
---|
| 483 | }
|
---|
| 484 | }
|
---|
| 485 | /* A successful result overwrites any previous error */
|
---|
| 486 | if(res->last_status != ARES_SUCCESS)
|
---|
| 487 | res->last_status = status;
|
---|
| 488 | }
|
---|
| 489 |
|
---|
| 490 | /*
|
---|
| 491 | * Curl_resolver_getaddrinfo() - when using ares
|
---|
| 492 | *
|
---|
| 493 | * Returns name information about the given hostname and port number. If
|
---|
| 494 | * successful, the 'hostent' is returned and the forth argument will point to
|
---|
| 495 | * memory we need to free after use. That memory *MUST* be freed with
|
---|
| 496 | * Curl_freeaddrinfo(), nothing else.
|
---|
| 497 | */
|
---|
| 498 | Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
|
---|
| 499 | const char *hostname,
|
---|
| 500 | int port,
|
---|
| 501 | int *waitp)
|
---|
| 502 | {
|
---|
| 503 | char *bufp;
|
---|
| 504 | struct Curl_easy *data = conn->data;
|
---|
| 505 | struct in_addr in;
|
---|
| 506 | int family = PF_INET;
|
---|
| 507 | #ifdef ENABLE_IPV6 /* CURLRES_IPV6 */
|
---|
| 508 | struct in6_addr in6;
|
---|
| 509 | #endif /* CURLRES_IPV6 */
|
---|
| 510 |
|
---|
| 511 | *waitp = 0; /* default to synchronous response */
|
---|
| 512 |
|
---|
| 513 | /* First check if this is an IPv4 address string */
|
---|
| 514 | if(Curl_inet_pton(AF_INET, hostname, &in) > 0) {
|
---|
| 515 | /* This is a dotted IP address 123.123.123.123-style */
|
---|
| 516 | return Curl_ip2addr(AF_INET, &in, hostname, port);
|
---|
| 517 | }
|
---|
| 518 |
|
---|
| 519 | #ifdef ENABLE_IPV6 /* CURLRES_IPV6 */
|
---|
| 520 | /* Otherwise, check if this is an IPv6 address string */
|
---|
| 521 | if(Curl_inet_pton (AF_INET6, hostname, &in6) > 0)
|
---|
| 522 | /* This must be an IPv6 address literal. */
|
---|
| 523 | return Curl_ip2addr(AF_INET6, &in6, hostname, port);
|
---|
| 524 |
|
---|
| 525 | switch(conn->ip_version) {
|
---|
| 526 | default:
|
---|
| 527 | #if ARES_VERSION >= 0x010601
|
---|
| 528 | family = PF_UNSPEC; /* supported by c-ares since 1.6.1, so for older
|
---|
| 529 | c-ares versions this just falls through and defaults
|
---|
| 530 | to PF_INET */
|
---|
| 531 | break;
|
---|
| 532 | #endif
|
---|
| 533 | case CURL_IPRESOLVE_V4:
|
---|
| 534 | family = PF_INET;
|
---|
| 535 | break;
|
---|
| 536 | case CURL_IPRESOLVE_V6:
|
---|
| 537 | family = PF_INET6;
|
---|
| 538 | break;
|
---|
| 539 | }
|
---|
| 540 | #endif /* CURLRES_IPV6 */
|
---|
| 541 |
|
---|
| 542 | bufp = strdup(hostname);
|
---|
| 543 | if(bufp) {
|
---|
| 544 | struct ResolverResults *res = NULL;
|
---|
| 545 | free(conn->async.hostname);
|
---|
| 546 | conn->async.hostname = bufp;
|
---|
| 547 | conn->async.port = port;
|
---|
| 548 | conn->async.done = FALSE; /* not done */
|
---|
| 549 | conn->async.status = 0; /* clear */
|
---|
| 550 | conn->async.dns = NULL; /* clear */
|
---|
| 551 | res = calloc(sizeof(struct ResolverResults), 1);
|
---|
| 552 | if(!res) {
|
---|
| 553 | free(conn->async.hostname);
|
---|
| 554 | conn->async.hostname = NULL;
|
---|
| 555 | return NULL;
|
---|
| 556 | }
|
---|
| 557 | conn->async.os_specific = res;
|
---|
| 558 |
|
---|
| 559 | /* initial status - failed */
|
---|
| 560 | res->last_status = ARES_ENOTFOUND;
|
---|
| 561 | #ifdef ENABLE_IPV6 /* CURLRES_IPV6 */
|
---|
| 562 | if(family == PF_UNSPEC) {
|
---|
| 563 | if(Curl_ipv6works()) {
|
---|
| 564 | res->num_pending = 2;
|
---|
| 565 |
|
---|
| 566 | /* areschannel is already setup in the Curl_open() function */
|
---|
| 567 | ares_gethostbyname((ares_channel)data->state.resolver, hostname,
|
---|
| 568 | PF_INET, query_completed_cb, conn);
|
---|
| 569 | ares_gethostbyname((ares_channel)data->state.resolver, hostname,
|
---|
| 570 | PF_INET6, query_completed_cb, conn);
|
---|
| 571 | }
|
---|
| 572 | else {
|
---|
| 573 | res->num_pending = 1;
|
---|
| 574 |
|
---|
| 575 | /* areschannel is already setup in the Curl_open() function */
|
---|
| 576 | ares_gethostbyname((ares_channel)data->state.resolver, hostname,
|
---|
| 577 | PF_INET, query_completed_cb, conn);
|
---|
| 578 | }
|
---|
| 579 | }
|
---|
| 580 | else
|
---|
| 581 | #endif /* CURLRES_IPV6 */
|
---|
| 582 | {
|
---|
| 583 | res->num_pending = 1;
|
---|
| 584 |
|
---|
| 585 | /* areschannel is already setup in the Curl_open() function */
|
---|
| 586 | ares_gethostbyname((ares_channel)data->state.resolver, hostname, family,
|
---|
| 587 | query_completed_cb, conn);
|
---|
| 588 | }
|
---|
| 589 |
|
---|
| 590 | *waitp = 1; /* expect asynchronous response */
|
---|
| 591 | }
|
---|
| 592 | return NULL; /* no struct yet */
|
---|
| 593 | }
|
---|
| 594 |
|
---|
| 595 | CURLcode Curl_set_dns_servers(struct Curl_easy *data,
|
---|
| 596 | char *servers)
|
---|
| 597 | {
|
---|
| 598 | CURLcode result = CURLE_NOT_BUILT_IN;
|
---|
| 599 | int ares_result;
|
---|
| 600 |
|
---|
| 601 | /* If server is NULL or empty, this would purge all DNS servers
|
---|
| 602 | * from ares library, which will cause any and all queries to fail.
|
---|
| 603 | * So, just return OK if none are configured and don't actually make
|
---|
| 604 | * any changes to c-ares. This lets c-ares use it's defaults, which
|
---|
| 605 | * it gets from the OS (for instance from /etc/resolv.conf on Linux).
|
---|
| 606 | */
|
---|
| 607 | if(!(servers && servers[0]))
|
---|
| 608 | return CURLE_OK;
|
---|
| 609 |
|
---|
| 610 | #if (ARES_VERSION >= 0x010704)
|
---|
| 611 | ares_result = ares_set_servers_csv(data->state.resolver, servers);
|
---|
| 612 | switch(ares_result) {
|
---|
| 613 | case ARES_SUCCESS:
|
---|
| 614 | result = CURLE_OK;
|
---|
| 615 | break;
|
---|
| 616 | case ARES_ENOMEM:
|
---|
| 617 | result = CURLE_OUT_OF_MEMORY;
|
---|
| 618 | break;
|
---|
| 619 | case ARES_ENOTINITIALIZED:
|
---|
| 620 | case ARES_ENODATA:
|
---|
| 621 | case ARES_EBADSTR:
|
---|
| 622 | default:
|
---|
| 623 | result = CURLE_BAD_FUNCTION_ARGUMENT;
|
---|
| 624 | break;
|
---|
| 625 | }
|
---|
| 626 | #else /* too old c-ares version! */
|
---|
| 627 | (void)data;
|
---|
| 628 | (void)(ares_result);
|
---|
| 629 | #endif
|
---|
| 630 | return result;
|
---|
| 631 | }
|
---|
| 632 |
|
---|
| 633 | CURLcode Curl_set_dns_interface(struct Curl_easy *data,
|
---|
| 634 | const char *interf)
|
---|
| 635 | {
|
---|
| 636 | #if (ARES_VERSION >= 0x010704)
|
---|
| 637 | if(!interf)
|
---|
| 638 | interf = "";
|
---|
| 639 |
|
---|
| 640 | ares_set_local_dev((ares_channel)data->state.resolver, interf);
|
---|
| 641 |
|
---|
| 642 | return CURLE_OK;
|
---|
| 643 | #else /* c-ares version too old! */
|
---|
| 644 | (void)data;
|
---|
| 645 | (void)interf;
|
---|
| 646 | return CURLE_NOT_BUILT_IN;
|
---|
| 647 | #endif
|
---|
| 648 | }
|
---|
| 649 |
|
---|
| 650 | CURLcode Curl_set_dns_local_ip4(struct Curl_easy *data,
|
---|
| 651 | const char *local_ip4)
|
---|
| 652 | {
|
---|
| 653 | #if (ARES_VERSION >= 0x010704)
|
---|
| 654 | struct in_addr a4;
|
---|
| 655 |
|
---|
| 656 | if((!local_ip4) || (local_ip4[0] == 0)) {
|
---|
| 657 | a4.s_addr = 0; /* disabled: do not bind to a specific address */
|
---|
| 658 | }
|
---|
| 659 | else {
|
---|
| 660 | if(Curl_inet_pton(AF_INET, local_ip4, &a4) != 1) {
|
---|
| 661 | return CURLE_BAD_FUNCTION_ARGUMENT;
|
---|
| 662 | }
|
---|
| 663 | }
|
---|
| 664 |
|
---|
| 665 | ares_set_local_ip4((ares_channel)data->state.resolver, ntohl(a4.s_addr));
|
---|
| 666 |
|
---|
| 667 | return CURLE_OK;
|
---|
| 668 | #else /* c-ares version too old! */
|
---|
| 669 | (void)data;
|
---|
| 670 | (void)local_ip4;
|
---|
| 671 | return CURLE_NOT_BUILT_IN;
|
---|
| 672 | #endif
|
---|
| 673 | }
|
---|
| 674 |
|
---|
| 675 | CURLcode Curl_set_dns_local_ip6(struct Curl_easy *data,
|
---|
| 676 | const char *local_ip6)
|
---|
| 677 | {
|
---|
| 678 | #if (ARES_VERSION >= 0x010704) && defined(ENABLE_IPV6)
|
---|
| 679 | unsigned char a6[INET6_ADDRSTRLEN];
|
---|
| 680 |
|
---|
| 681 | if((!local_ip6) || (local_ip6[0] == 0)) {
|
---|
| 682 | /* disabled: do not bind to a specific address */
|
---|
| 683 | memset(a6, 0, sizeof(a6));
|
---|
| 684 | }
|
---|
| 685 | else {
|
---|
| 686 | if(Curl_inet_pton(AF_INET6, local_ip6, a6) != 1) {
|
---|
| 687 | return CURLE_BAD_FUNCTION_ARGUMENT;
|
---|
| 688 | }
|
---|
| 689 | }
|
---|
| 690 |
|
---|
| 691 | ares_set_local_ip6((ares_channel)data->state.resolver, a6);
|
---|
| 692 |
|
---|
| 693 | return CURLE_OK;
|
---|
| 694 | #else /* c-ares version too old! */
|
---|
| 695 | (void)data;
|
---|
| 696 | (void)local_ip6;
|
---|
| 697 | return CURLE_NOT_BUILT_IN;
|
---|
| 698 | #endif
|
---|
| 699 | }
|
---|
| 700 | #endif /* CURLRES_ARES */
|
---|