Thread: Re: canonical_dn

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Sorry,=20

a few small errors in my last mail's listings.
Here's the corrected version

Yours
Peter

----------  Forwarded Message  ----------

Subject: canonical_dn
Date: Sun, 6 Jan 2002 13:45:17 +0100
From: Peter Marschall <pet...@ma...>
To: per...@li...

Hi,

i have tried to use canonical_dn with UTF 8 and I think
it treats strings with UTF8 encoded values wrong.
Characters with codes > 127 have UTF8 encodings that
consist of 2 or more bytes that have all codes > 127.
Since these characters are legal in LDAPv3 DNs they should
not get escaped.
So line 310 of Net/LDAP/Util.pm should read

  $val =3D~ s/([\x00-\x1f])/sprintf("\\%02x",ord($1))/eg;

instead of the current version:

    $val =3D~ s/([\x00-\x1f\x7f-\xff])/sprintf("\\%02x",ord($1))/eg;

When changing canonical_dn() anyway, maybe changing the
implementation into three functions would be helpful.
It would give users of Net::LDAP a standardized way of dealing with
DNs and parts of it (very helpful when moving entries, ..) without having
to reimplement the wheel themselves.

Here is my idea:

## split a DN string into its parts; code stolen from canonical_dn() ##
# Synopsis:  @rdns =3D splitDN($dn, %optionHash)
# allowed options:
#  * lowercase: convert attribute names to lower case
#  * uppercase: convert attribute names to upper case
#  * sortRDN: sort RDN values
#  * splitRDN: split multi part RDNs into their parts
sub splitDN($%)
{
my $dn =3D shift;
my %opt =3D @_;
my @dn;
my @rdn;

 $dn =3D $dn->dn if ref($dn);

  while ($dn =3D~ /\G(?:
                \s*
                ([a-zA-Z][-a-zA-Z0-9]*|(?:[Oo][Ii][Dd]\.)?\d+(?:\.\d+)*)
                \s*
                =3D
                \s*
                (
                  (?:[^\\",=3D+<>\#;]*[^\\",=3D+<>\#;\s]|\\(?:[\\
",=3D+<>#;]|[0-9a-fA-F]{2}))*

                  \#(?:[0-9a-fA-F]{2})+

                  "(?:[^\\"]+|\\(?:[\\",=3D+<>#;]|[0-9a-fA-F]{2}))*"
                )
                \s*
                (?:([;,+])\s*(?=3D\S)|$)
                )\s*/gcx)
  {
  my ($type,$val,$sep) =3D ($1,$2,$3);

    $type =3D~ s/^oid\.(\d+(\.\d+)*)$/$1/i;
    $type =3D lc($type)  if ($opt{lowercase});
    $type =3D uc($type)  if ($opt{uppercase});

    if ($val !~ /^#/)
    {
      $val =3D~ s/^"(.*)"$/$1/;
      $val =3D~ s/\\([\\ ",=3D+<>#;]|[0-9a-fA-F]{2})
               /length($1)=3D=3D1 ? $1 : chr(hex($1))
               /xeg;
      $val =3D~ s/([\\",=3D+<>#;])/\\$1/g;
      $val =3D~ s/([\x00-\x1F])/sprintf("\\%02x",ord($1))/eg;

      $val =3D~ s/(^\s+|\s+$)/"\\20" x length $1/ge;
    }

    push @rdn, "$type=3D$val";

    unless (defined $sep and $sep eq '+')
    {
      @rdn =3D sort(@rdn)  if ($opt{sortRDN});
      push @dn, ($opt{splitRDN}) ?
                  ((scalar(@rdn) > 1) ? [ @rdn ] : ($rdn[0] || '')) :
                  join('+', @rdn);
      @rdn =3D ();
    }
  }

  return((length($dn) !=3D (pos($dn) || 0)) ? () : @dn);
}

## join RDNs and RDN parts into a DN string ##
# Synopsis:  $dn =3D joinDN(@dnpartref, %optionhash)
sub joinDN(\@%)
{
my @dnparts =3D @i{+shift};
my %opt =3D @_;
my $dn =3D '';

  @dnparts =3D reverse(@dnparts)  if ($opt{reversed});

  foreach my $part (@dnparts)
  {
    $dn .=3D (($opt{reversed}) ? '\000' : ',')  if ($dn);

    if (ref($part))     # multi part RDN
    {
    my $rdn;

      foreach my $rdnpart (@$part)
      {
        return  if (!$rdnpart);

        $rdn .=3D (($opt{reversed}) ? '\001' : '+')  if ($rdn);
        $rdn .=3D $rdnpart;
      }
      $dn .=3D $rdn;
    }
    else                # single part RDN
    {
      return  if (!$part);

      $dn .=3D $part;
    }
  }

  return($dn);
}

These two basic functions now allow to implement
canonical_dn() with only a few lines:

sub canonical_dn($;$) {
  my ($dn, $rev) =3D @_;

  $dn =3D $dn->dn if ref($dn);

  my @dnparts =3D splitDN($dn, uppercase =3D> 1, splitRDN =3D> 1, sortRDN=
 =3D> 1);

  joinDN(@dnparts, reversed =3D> ($rev||0));
}

Yours
Peter

--
Peter Marschall     |   eMail: pet...@ma...
Scheffelstra=DFe 15   |          pet...@is...
97072 W=FCrzburg      |   Tel:   0931/14721
PGP:  D7 FF 20 FE E6 6B 31 74  D1 10 88 E0 3C FE 28 35

-------------------------------------------------------

--=20
Peter Marschall     |   eMail: pet...@ma...
Scheffelstra=DFe 15   |          pet...@is...
97072 W=FCrzburg      |   Tel:   0931/14721
PGP:  D7 FF 20 FE E6 6B 31 74  D1 10 88 E0 3C FE 28 35

Thread: Re: canonical_dn

perl-ldap-dev