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Annotation of embedaddon/curl/lib/hostasyn.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
        !             9:  *
        !            10:  * This software is licensed as described in the file COPYING, which
        !            11:  * you should have received as part of this distribution. The terms
        !            12:  * are also available at https://curl.haxx.se/docs/copyright.html.
        !            13:  *
        !            14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
        !            15:  * copies of the Software, and permit persons to whom the Software is
        !            16:  * furnished to do so, under the terms of the COPYING file.
        !            17:  *
        !            18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
        !            19:  * KIND, either express or implied.
        !            20:  *
        !            21:  ***************************************************************************/
        !            22: 
        !            23: #include "curl_setup.h"
        !            24: 
        !            25: /***********************************************************************
        !            26:  * Only for builds using asynchronous name resolves
        !            27:  **********************************************************************/
        !            28: #ifdef CURLRES_ASYNCH
        !            29: 
        !            30: #ifdef HAVE_NETINET_IN_H
        !            31: #include <netinet/in.h>
        !            32: #endif
        !            33: #ifdef HAVE_NETDB_H
        !            34: #include <netdb.h>
        !            35: #endif
        !            36: #ifdef HAVE_ARPA_INET_H
        !            37: #include <arpa/inet.h>
        !            38: #endif
        !            39: #ifdef __VMS
        !            40: #include <in.h>
        !            41: #include <inet.h>
        !            42: #endif
        !            43: 
        !            44: #ifdef HAVE_PROCESS_H
        !            45: #include <process.h>
        !            46: #endif
        !            47: 
        !            48: #include "urldata.h"
        !            49: #include "sendf.h"
        !            50: #include "hostip.h"
        !            51: #include "hash.h"
        !            52: #include "share.h"
        !            53: #include "strerror.h"
        !            54: #include "url.h"
        !            55: #include "curl_memory.h"
        !            56: /* The last #include file should be: */
        !            57: #include "memdebug.h"
        !            58: 
        !            59: /*
        !            60:  * Curl_addrinfo_callback() gets called by ares, gethostbyname_thread()
        !            61:  * or getaddrinfo_thread() when we got the name resolved (or not!).
        !            62:  *
        !            63:  * If the status argument is CURL_ASYNC_SUCCESS, this function takes
        !            64:  * ownership of the Curl_addrinfo passed, storing the resolved data
        !            65:  * in the DNS cache.
        !            66:  *
        !            67:  * The storage operation locks and unlocks the DNS cache.
        !            68:  */
        !            69: CURLcode Curl_addrinfo_callback(struct connectdata *conn,
        !            70:                                 int status,
        !            71:                                 struct Curl_addrinfo *ai)
        !            72: {
        !            73:   struct Curl_dns_entry *dns = NULL;
        !            74:   CURLcode result = CURLE_OK;
        !            75: 
        !            76:   conn->async.status = status;
        !            77: 
        !            78:   if(CURL_ASYNC_SUCCESS == status) {
        !            79:     if(ai) {
        !            80:       struct Curl_easy *data = conn->data;
        !            81: 
        !            82:       if(data->share)
        !            83:         Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
        !            84: 
        !            85:       dns = Curl_cache_addr(data, ai,
        !            86:                             conn->async.hostname,
        !            87:                             conn->async.port);
        !            88:       if(data->share)
        !            89:         Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
        !            90: 
        !            91:       if(!dns) {
        !            92:         /* failed to store, cleanup and return error */
        !            93:         Curl_freeaddrinfo(ai);
        !            94:         result = CURLE_OUT_OF_MEMORY;
        !            95:       }
        !            96:     }
        !            97:     else {
        !            98:       result = CURLE_OUT_OF_MEMORY;
        !            99:     }
        !           100:   }
        !           101: 
        !           102:   conn->async.dns = dns;
        !           103: 
        !           104:  /* Set async.done TRUE last in this function since it may be used multi-
        !           105:     threaded and once this is TRUE the other thread may read fields from the
        !           106:     async struct */
        !           107:   conn->async.done = TRUE;
        !           108: 
        !           109:   /* IPv4: The input hostent struct will be freed by ares when we return from
        !           110:      this function */
        !           111:   return result;
        !           112: }
        !           113: 
        !           114: /*
        !           115:  * Curl_getaddrinfo() is the generic low-level name resolve API within this
        !           116:  * source file. There are several versions of this function - for different
        !           117:  * name resolve layers (selected at build-time). They all take this same set
        !           118:  * of arguments
        !           119:  */
        !           120: Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
        !           121:                                 const char *hostname,
        !           122:                                 int port,
        !           123:                                 int *waitp)
        !           124: {
        !           125:   return Curl_resolver_getaddrinfo(conn, hostname, port, waitp);
        !           126: }
        !           127: 
        !           128: #endif /* CURLRES_ASYNCH */