My interpretation, from the way the question is phrased, is that you are looking for the DC that logged you in.

That info is in the environment variable "LOGONSERVER". in perl, you can get the info by querying 

  $ENV{LOGONSERVER}

[download]
In case you are looking for more generic info on how to find all DC's for a domain, here is my code for that: 
use strict;
use Net::DNS;
use Win32::OLE;
# Specify the domain name on the command line
# or use the default.
my $domain = $ARGV[0] || 'YourDomainName.com';

print "====Querying for Domain Controllers in $domain====\n";

my %dcinfo = DNS_SRV_Query($domain, "_ldap._tcp.dc._msdcs");
while (my ($n,$IP) = each %dcinfo){
  print "  DC: $n  [$IP]\n";
}

my $forest = $ARGV[0] || 'YourForestName.com';

print "====Querying for Global Catalog servers in $forest====\n";
%dcinfo = DNS_SRV_Query($forest, "_ldap._tcp.gc._msdcs");
while (my ($n,$IP) = each %dcinfo){
  print "  GC: $n  [$IP]\n";
}
print "====Querying FSMO, Infrastrasturcture master servers in $domain
+====\n";
FSMO_Query($domain);

##########################
sub DNS_SRV_Query{
 my ($name,$DNSPrefix) = @_;
 my %results;
 my $DNS = Net::DNS::Resolver->new();

 my $query = $DNS->search("$DNSPrefix.$domain",  "SRV")
    or die "DNS SRV query ($DNSPrefix.$domain) failed: ", $DNS->errors
+tring, "\n";

 foreach my $rr ($query->answer) {
    next unless $rr->type eq "SRV";
    my $query2 = $DNS->search($rr->target, "A");
    if ($query2) {
       foreach my $rr2 ($query2->answer) {
          next unless $rr2->type eq "A";
          $results{$rr->target} .= $rr2->address . " ";
       }
    }
 }
 return %results;
}

######################################
sub FSMO_Query{
  my $strDomain = shift or die "No domain name specified";  # e.g. eme
+a.rallencorp.com

  $Win32::OLE::Warn = 3;
  my $objRootDSE = Win32::OLE->GetObject("LDAP://$strDomain/RootDSE");
  my $strDomainDN  = $objRootDSE->Get("defaultNamingContext");
  my $strSchemaDN = $objRootDSE->Get("schemaNamingContext");
  my $strConfigDN = $objRootDSE->Get("configurationNamingContext");


  PrintMasterName($strDomainDN,"PDC Emulator");
  PrintMasterName("cn=RID Manager\$,cn=system","RID Master", $strDomai
+nDN);
  PrintMasterName($strSchemaDN,"Schema Master");
  PrintMasterName("cn=Partitions","Domain Naming Master",$strConfigDN)
+;
  PrintMasterName("cn=Infrastructure","Infrastructure Master",$strDoma
+inDN);
  # PDC Emulator
  my $objPDCFsmo = Win32::OLE->GetObject("LDAP://" . $strDomainDN);
  print "PDC Emulator: ", $objPDCFsmo->fsmoroleowner,"\n";

  my $PDC =  $objPDCFsmo->fsmoroleowner;
  print "I think the PDC name is :" . ExtractName($PDC,$strDomain) . "
+\n";

  # RID Master
  my $objRIDFsmo = Win32::OLE->GetObject("LDAP://cn=RID Manager\$,cn=s
+ystem,$strDomainDN");
  print "RID Master: ", $objRIDFsmo->fsmoroleowner, "\n";
  print "I think the RID Master is :" . ExtractName($objRIDFsmo->fsmor
+oleowner,$strDomain) . "\n";
  # Schema Master
  my $objSchemaFsmo = Win32::OLE->GetObject("LDAP://" . $strSchemaDN);
  print "Schema Master: ", $objSchemaFsmo->fsmoroleowner,"\n";
  print "I think the Schema Master is :" . ExtractName($objSchemaFsmo-
+>fsmoroleowner,$strDomain) . "\n";
  # Infrastructure Master
  my $objInfraFsmo = Win32::OLE->GetObject("LDAP://cn=Infrastructure,"
+ . $strDomainDN);
  print "Infrastructure Master: ", $objInfraFsmo->fsmoroleowner,"\n";
  
  # Domain Naming Master
  my $objDNFsmo = Win32::OLE->GetObject("LDAP://cn=Partitions," . $str
+ConfigDN);
  print "Domain Naming Master: ", $objDNFsmo->fsmoroleowner,"\n";
  print "I think the Domain Naming Master is :" . ExtractName($objDNFs
+mo->fsmoroleowner,$strDomain) . "\n";
}
##################################3
sub PrintMasterName{
   my ($FetchDN, $Type, $SourceDN) = @_;
  my $obj = Win32::OLE->GetObject("LDAP://$FetchDN"
           .      ($SourceDN ? ",$SourceDN" : "") );
 # print "==$Type DN: ", $obj->fsmoroleowner, "\n";
  print "==I think the $Type is :" . ExtractName($obj->fsmoroleowner,$
+domain) . "\n";
}
##################################3
sub ExtractName{
   my $str=shift;
   my @dom = split /\./, shift;
   STRINGPIECE:
     for (split /,/, $str){
        m/Settings$/i and next;
        m/Servers$/i and next;
        m/Sites$/i and next;
        m/Configuration$/i and next;
        for my $domain_piece(@dom){
           m/$domain_piece/ and next STRINGPIECE;
        }
        m/CN=(\w+)/;
        return $1; # Passed all tests !
   }
}

[download]

    Earth first! (We'll rob the other planets later)

In reply to Re: Get Domain Controller by NetWallah
in thread Get Domain Controller by slloyd

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