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Annotation of embedaddon/curl/lib/hostasyn.c, revision 1.1.1.1

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 */