imapsync/W/learn/resolvme

#!/usr/bin/perl 


use strict ;
use warnings ;
use English ;

use Socket qw( SOCK_STREAM AI_CANONNAME NI_NUMERICHOST NIx_NOSERV getaddrinfo getnameinfo );
#use Socket::GetAddrInfo qw( getaddrinfo getnameinfo );
use IO::Socket;


check_name_and_service( @ARGV ) ;

sub check_name_and_service {

my ( $name, $service ) = @ARG ;

my %hints = ( socktype => SOCK_STREAM, flags => AI_CANONNAME );
my ( $err, @res ) = getaddrinfo(  $name, $service, \%hints );
 
print "Cannot resolve name - $err\n" if $err;
 
my $sock;
 
foreach my $ai ( @res ) {
   my $candidate = IO::Socket->new();
   $candidate->timeout( 2 ) ;
   
   print "family: ", $ai->{family}, 
       "\nsocktype: ", $ai->{socktype}, 
	   "\nprotocol: ", $ai->{protocol}, 
	   "\ncanonname: ", $ai->{canonname},
	   "\ntimeout: ", $candidate->timeout,
	   "\n" ;
   $candidate->socket( $ai->{family}, $ai->{socktype}, $ai->{protocol} )
      or next ;
 
   $candidate->connect( $ai->{addr} ) or next ;
 
   $sock = $candidate;
   
   if( $sock ) {
      my ( $err, $host, $service ) = getnameinfo( $sock->peername );
      print "Connected to $host:$service\n" if !$err;
	  my ($err, $ipaddr) = getnameinfo($ai->{addr}, NI_NUMERICHOST, NIx_NOSERV);
	  print "ipaddr: $ipaddr\n";
	  $sock->close ;
	  #last ;
   }
}
 
}