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Re: Question about ldap_init()/ldap_initialize() behavior with OpenLDAP

Frank Crow wrote:

Well, I have answered some of the questions with a look at the OpenLDAP source
code.   Under the hood, the ldap_init() does:

ldap_set_option(ld, LDAP_OPT_HOST_NAME, defhost);

And the ldap_initailize() does:

ldap_set_option(ld, LDAP_OPT_URI, url);

The man page for ldap_set_option() clearly states that both of those settings
take multiple host names.   The former (albeit deprecated) takes a list
separated by whitespace whereas the latter takes a "comma- or space-separated
list of URIs".

However either case call determines the default host, I'm not yet sure.   It
may be that the ldap.conf file (or the environment variables) are only used by
the ldap command line tools and not the underlying API itself.
The ldap.conf(5) man page is quite explicit already. "Environmental variables may also be used to augment the file based defaults." 

Read more carefully.


Still looking... feel free to save me some time if you know!   ;-)

-Frank


On Wed, Mar 30, 2016 at 2:09 PM, Frank Crow <fjcrow2008@gmail.com
<mailto:fjcrow2008@gmail.com>> wrote:

    Well, I'll have to retract the "apology in advance".  LOL   According the
    owner of the OpenLDAP-devel list, this question belongs here.

    So, any help on the matter is appreciated.   I'm currently digging through
    the OpenLDAP source code.   If I figure it out, I'll post it.


    Thanks,
    Frank


    On Wed, Mar 30, 2016 at 10:41 AM, Frank Crow <fjcrow2008@gmail.com
    <mailto:fjcrow2008@gmail.com>> wrote:

        I understand the order, which I have read in the man page that you
        have mentioned.   What I'm not clear on, and what is not detailed in
        the respective man page, is whether or not
        ldap_init()/ldap_initailize() will use ldap.conf or the respective
        environment variables.


        Thanks,
        Frank


        On Wed, Mar 30, 2016 at 10:37 AM, Dan White <dwhite@cafedemocracy.org
        <mailto:dwhite@cafedemocracy.org>> wrote:

            On 03/30/16 10:19 -0400, Frank Crow wrote:

                I'm not clear on whether I'm allowed to ask "C" API questions
                here.   If
                not, I apologize in advance and please disregard in that
                case.   However,
                the question is more about configuration than coding.

                I'm seeing that the ldap_init() function allows the hostname
                parameter to
                be null or a list of hosts.    If it is null, the function
                attempts to
                determine the default ldap host.

                How does it determine the default LDAP host when the hostname
                parameter is
                null?   Does it load the list of hosts from the ldap.conf URI
                parameter?
                And/or does it use the LDAPURI environment variable?


            The order is detailed in the ldap.conf manpage, within the DESCRIPTION
            section.

            --
            Dan White




        --
        Frank




    --
    Frank




--
Frank



--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/