(ITS#7157) UTF-8 support for "mail" attribute

[alfiej@opera.com]

Full_Name: Alfie John
Version: 2.4.23
OS: Debian Squeeze
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (220.245.36.226)


When searching for Chinese names in the "to:" field under Thunderbird, I see
asserted_value_validate_normalize() not returning LDAP_SUCCESS in filter.c. This
is because the "mail" attribute in core.schema is of type "IA5 String" but the
Chinese name falls outside the character set.

The work around I have is to modify the "mail" attributetype in the core.schema
from:

  attributetype ( 0.9.2342.19200300.100.1.3
    NAME ( 'mail' 'rfc822Mailbox' )
    DESC 'RFC1274: RFC822 Mailbox'
    EQUALITY caseIgnoreIA5Match
    SUBSTR caseIgnoreIA5SubstringsMatch
    SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{256} )

to:

  attributetype ( 0.9.2342.19200300.100.1.3
    NAME ( 'mail' 'rfc822Mailbox' )
    DESC 'RFC1274: RFC822 Mailbox'
    EQUALITY caseIgnoreMatch
    SUBSTR caseIgnoreSubstringsMatch
    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{256} )

Dieter Klünter pointed out on the openldap-technical mailing list that this
breaks RFC-5322. However Charles T. Brooks suggests:

  Non-english character sets are going to become part of
  hostnames and DNS.  That's inevitable.

  Mail addresses are based on DNS hostnames.

  Ergo, mail attributes will one day need to support all possible 
  characters.

Given that, I think the above changes to core.schema seem worthwhile.