git.m6w6.name Git - awesomized/libmemcached/blob - libtest/dns.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Data Differential YATL (i.e. libtest)  library
   4  *
   5  *  Copyright (C) 2012 Data Differential, http://datadifferential.com/
   6  *
   7  *  Redistribution and use in source and binary forms, with or without
   8  *  modification, are permitted provided that the following conditions are
   9  *  met:
  10  *
  11  *      * Redistributions of source code must retain the above copyright
  12  *  notice, this list of conditions and the following disclaimer.
  13  *
  14  *      * Redistributions in binary form must reproduce the above
  15  *  copyright notice, this list of conditions and the following disclaimer
  16  *  in the documentation and/or other materials provided with the
  17  *  distribution.
  18  *
  19  *      * The names of its contributors may not be used to endorse or
  20  *  promote products derived from this software without specific prior
  21  *  written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  29  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  30  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  33  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  */
  36
  37 #include "libtest/yatlcon.h"
  38 #include <libtest/common.h>
  39
  40 #include <sys/types.h>
  41 #include <sys/socket.h>
  42 #include <netdb.h>
  43
  44 namespace libtest {
  45
  46 bool lookup(const char* host)
  47 {
  48   bool success= false;
  49   if (host)
  50   {
  51     assert(host);
  52     struct addrinfo *addrinfo= NULL;
  53
  54     int limit= 5;
  55     while (--limit and success == false)
  56     {
  57       if (addrinfo)
  58       {
  59         freeaddrinfo(addrinfo);
  60         addrinfo= NULL;
  61       }
  62
  63       int ret;
  64       if ((ret= getaddrinfo(host, NULL, NULL, &addrinfo)) == 0)
  65       {
  66         success= true;
  67         break;
  68       }
  69
  70       switch (ret)
  71       {
  72       case EAI_AGAIN:
  73         continue;
  74
  75       case EAI_NONAME:
  76       default:
  77         break;
  78       }
  79
  80       break;
  81     }
  82
  83     if (addrinfo)
  84     {
  85       freeaddrinfo(addrinfo);
  86     }
  87   }
  88
  89   return success;
  90 }
  91
  92
  93 bool check_dns()
  94 {
  95   if (lookup("exist.gearman.info") == false)
  96   {
  97     return false;
  98   }
  99
 100   if (lookup("does_not_exist.gearman.info")) // This should fail, if it passes,...
 101   {
 102     fatal_assert("Your service provider sucks and is providing bogus DNS. You might be in an airport.");
 103   }
 104
 105   return true;
 106 }
 107
 108 } // namespace libtest
 109