Utilities/cmcurl/hostasyn.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2006, 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 http://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  * $Id: hostasyn.c,v 1.2 2007-03-15 19:22:13 andy Exp $
  22  ***************************************************************************/
  23
  24 #include "setup.h"
  25
  26 #include <string.h>
  27
  28 #ifdef NEED_MALLOC_H
  29 #include <malloc.h>
  30 #endif
  31 #ifdef HAVE_SYS_TYPES_H
  32 #include <sys/types.h>
  33 #endif
  34 #ifdef HAVE_SYS_SOCKET_H
  35 #include <sys/socket.h>
  36 #endif
  37 #ifdef HAVE_NETINET_IN_H
  38 #include <netinet/in.h>
  39 #endif
  40 #ifdef HAVE_NETDB_H
  41 #include <netdb.h>
  42 #endif
  43 #ifdef HAVE_ARPA_INET_H
  44 #include <arpa/inet.h>
  45 #endif
  46 #ifdef HAVE_STDLIB_H
  47 #include <stdlib.h>     /* required for free() prototypes */
  48 #endif
  49 #ifdef HAVE_UNISTD_H
  50 #include <unistd.h>     /* for the close() proto */
  51 #endif
  52 #ifdef  VMS
  53 #include <in.h>
  54 #include <inet.h>
  55 #include <stdlib.h>
  56 #endif
  57
  58 #ifdef HAVE_SETJMP_H
  59 #include <setjmp.h>
  60 #endif
  61
  62 #ifdef HAVE_PROCESS_H
  63 #include <process.h>
  64 #endif
  65
  66 #include "urldata.h"
  67 #include "sendf.h"
  68 #include "hostip.h"
  69 #include "hash.h"
  70 #include "share.h"
  71 #include "strerror.h"
  72 #include "url.h"
  73
  74 #define _MPRINTF_REPLACE /* use our functions only */
  75 #include <curl/mprintf.h>
  76
  77 #if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
  78 #include "inet_ntoa_r.h"
  79 #endif
  80
  81 #include "memory.h"
  82 /* The last #include file should be: */
  83 #include "memdebug.h"
  84
  85 /***********************************************************************
  86  * Only for builds using asynchronous name resolves
  87  **********************************************************************/
  88 #ifdef CURLRES_ASYNCH
  89 /*
  90  * addrinfo_callback() gets called by ares, gethostbyname_thread() or
  91  * getaddrinfo_thread() when we got the name resolved (or not!).
  92  *
  93  * If the status argument is CURL_ASYNC_SUCCESS, we might need to copy the
  94  * address field since it might be freed when this function returns. This
  95  * operation stores the resolved data in the DNS cache.
  96  *
  97  * NOTE: for IPv6 operations, Curl_addrinfo_copy() returns the same
  98  * pointer it is given as argument!
  99  *
 100  * The storage operation locks and unlocks the DNS cache.
 101  */
 102 static CURLcode addrinfo_callback(void *arg, /* "struct connectdata *" */
 103                                   int status,
 104                                   void *addr)
 105 {
 106   struct connectdata *conn = (struct connectdata *)arg;
 107   struct Curl_dns_entry *dns = NULL;
 108   CURLcode rc = CURLE_OK;
 109
 110   conn->async.status = status;
 111
 112   if(CURL_ASYNC_SUCCESS == status) {
 113
 114     /*
 115      * IPv4/ares: Curl_addrinfo_copy() copies the address and returns an
 116      * allocated version.
 117      *
 118      * IPv6: Curl_addrinfo_copy() returns the input pointer!
 119      */
 120     Curl_addrinfo *ai = Curl_addrinfo_copy(addr, conn->async.port);
 121     if(ai) {
 122       struct SessionHandle *data = conn->data;
 123
 124       if(data->share)
 125         Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
 126
 127       dns = Curl_cache_addr(data, ai,
 128                             conn->async.hostname,
 129                             conn->async.port);
 130       if(!dns) {
 131         /* failed to store, cleanup and return error */
 132         Curl_freeaddrinfo(ai);
 133         rc = CURLE_OUT_OF_MEMORY;
 134       }
 135
 136       if(data->share)
 137         Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
 138     }
 139     else
 140       rc = CURLE_OUT_OF_MEMORY;
 141   }
 142
 143   conn->async.dns = dns;
 144
 145  /* Set async.done TRUE last in this function since it may be used multi-
 146     threaded and once this is TRUE the other thread may read fields from the
 147     async struct */
 148   conn->async.done = TRUE;
 149
 150   /* ipv4: The input hostent struct will be freed by ares when we return from
 151      this function */
 152   return rc;
 153 }
 154
 155 CURLcode Curl_addrinfo4_callback(void *arg, /* "struct connectdata *" */
 156                                  int status,
 157                                  struct hostent *hostent)
 158 {
 159   return addrinfo_callback(arg, status, hostent);
 160 }
 161
 162 #ifdef CURLRES_IPV6
 163 CURLcode Curl_addrinfo6_callback(void *arg, /* "struct connectdata *" */
 164                                  int status,
 165                                  struct addrinfo *ai)
 166 {
 167  /* NOTE: for CURLRES_ARES, the 'ai' argument is really a
 168   * 'struct hostent' pointer.
 169   */
 170   return addrinfo_callback(arg, status, ai);
 171 }
 172 #endif
 173
 174 #endif /* CURLRES_ASYNC */