'\" te
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.TH LDAP_URL 3LDAP "Dec 02, 2003"
.SH NAME
ldap_url, ldap_is_ldap_url, ldap_url_parse, ldap_url_parse_nodn,
ldap_free_urldesc, ldap_url_search, ldap_url_search_s, ldap_url_search_st,
ldap_dns_to_url, ldap_dn_to_url \- LDAP Uniform Resource Locator functions
.SH SYNOPSIS
.LP
.nf
cc[ \fIflag\fR... ] \fIfile\fR... -lldap[ \fIlibrary\fR... ]
#include <lber.h>
#include <ldap.h>

\fBint\fR \fBldap_is_ldap_url\fR(\fBchar\fR \fI*url\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_url_parse\fR(\fBchar\fR \fI*url\fR, \fBLDAPURLDesc\fR \fI**ludpp\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_url_parse_nodn\fR(\fBchar\fR \fI*url\fR, \fBLDAPURLDesc\fR \fI**ludpp\fR);
.fi

.LP
.nf
\fB\fR\fBldap_free_urldesc\fR(\fBLDAPURLDesc\fR \fI*ludp\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_url_search\fR(\fBLDAP\fR \fI*ld\fR, \fBchar\fR \fI*url\fR, \fBint\fR \fIattrsonly\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_url_search_s\fR(\fBLDAP\fR \fI*ld\fR, \fBchar\fR \fI*url\fR,
     \fBint\fR \fIattrsonly\fR, \fBLDAPMessage\fR \fI**res\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_url_search_st\fR(\fBLDAP\fR \fI*ld\fR, \fBchar\fR \fI*url\fR, \fBint\fR \fIattrsonly\fR,
     \fBstruct timeval\fR \fI*timeout\fR, \fBLDAPMessage\fR \fI**res\fR);
.fi

.LP
.nf
\fBchar *\fR\fBldap_dns_to_url\fR(\fBLDAP\fR \fI*ld\fR, \fBchar\fR \fI*dns_name\fR, \fBchar\fR \fI*attrs\fR,
     \fBchar\fR \fI*scope\fR, \fBchar\fR \fI*filter\fR);
.fi

.LP
.nf
\fBchar *\fR\fBldap_dn_to_url\fR(\fBLDAP\fR \fI*ld\fR, \fBchar\fR \fI*dn\fR, \fBint\fR \fInameparts\fR);
.fi

.SH DESCRIPTION
.sp
.LP
These functions support the use of LDAP URLs (Uniform Resource Locators). The
following shows the formatting used for LDAP URLs.
.sp
.in +2
.nf
\fBldap://\fR\fIhostport\fR\fB/\fR\fIdn\fR[\fB?\fR\fIattributes\fR[\fB?\fR\fIscope\fR[\fB?\fR\fIfilter\fR]]]
.fi
.in -2

.sp
.LP
where:
.sp
.ne 2
.na
\fB\fIhostport\fR\fR
.ad
.RS 14n
Host name with an optional \fB:portnumber\fR.
.RE

.sp
.ne 2
.na
\fB\fIdn\fR\fR
.ad
.RS 14n
Base DN to be used for an LDAP search operation.
.RE

.sp
.ne 2
.na
\fB\fIattributes\fR\fR
.ad
.RS 14n
Comma separated list of attributes to be retrieved.
.RE

.sp
.ne 2
.na
\fB\fIscope\fR\fR
.ad
.RS 14n
One of these three strings: base one sub (default=base).
.RE

.sp
.ne 2
.na
\fB\fIfilter\fR\fR
.ad
.RS 14n
LDAP search filter as used in a call to \fBldap_search\fR(3LDAP).
.RE

.sp
.LP
The following is an example of an LDAP URL:
.sp
.in +2
.nf
ldap://ldap.itd.umich.edu/c=US?o,description?one?o=umich
.fi
.in -2

.sp
.LP
URLs preceded \fBURL:\fR or wrapped in angle-brackets are tolerated. URLs can
also be preceded by \fBURL:\fR and wrapped in angle-brackets.
.sp
.LP
\fBldap_is_ldap_url()\fR returns a non-zero value if \fIurl\fR looks like an
LDAP URL (as opposed to some other kind of URL). It can be used as a quick
check for an LDAP URL; the \fBldap_url_parse()\fR function should be used if a
more thorough check is needed.
.sp
.LP
\fBldap_url_parse()\fR breaks down an LDAP URL passed in \fIurl\fR into its
component pieces. If successful, zero is returned, an LDAP URL description is
allocated, filled in, and \fIludpp\fR is set to point to it. See \fBRETURN
VALUES\fR for values returned upon error.
.sp
.LP
\fBldap_url_parse_nodn()\fR acts just like \fBldap_url_parse()\fR but does not
require \fIdn\fR in the LDAP URL.
.sp
.LP
\fBldap_free_urldesc()\fR should be called to free an LDAP URL description that
was obtained from a call to \fBldap_url_parse()\fR.
.sp
.LP
\fBldap_url_search()\fR initiates an asynchronous LDAP search based on the
contents of the \fIurl\fR string. This function acts just like
\fBldap_search\fR(3LDAP) except that many search parameters are pulled out of
the URL.
.sp
.LP
\fBldap_url_search_s()\fR performs a synchronous LDAP search based on the
contents of the \fIurl\fR string. This function acts just like
\fBldap_search_s\fR(3LDAP) except that many search parameters are pulled out of
the URL.
.sp
.LP
\fBldap_url_search_st()\fR performs a synchronous LDAP URL search with a
specified \fItimeout\fR. This function acts just like
\fBldap_search_st\fR(3LDAP) except that many search parameters are pulled out
of the URL.
.sp
.LP
\fBldap_dns_to_url()\fR locates the LDAP URL associated with a DNS domain name.
The supplied DNS domain name is converted into a distinguished name. The
directory entry specified by that distinguished name is searched for a labeled
URI attribute. If successful then the corresponding LDAP URL is returned. If
unsuccessful then that entry's parent is searched and so on until the target
distinguished name is reduced to only two nameparts. If \fIdns_name\fR is
\fINULL\fR then the environment variable LOCALDOMAIN is used. If \fIattrs\fR is
not \fINULL\fR then it is appended to the URL's attribute list. If \fIscope\fR
is not NULL then it overrides the URL's scope. If \fIfilter\fR is not
\fINULL\fR then it is merged with the URL's filter. If an error is encountered
then zero is returned, otherwise a string URL is returned. The caller should
free the returned string if it is non-zero.
.sp
.LP
\fBldap_dn_to_url()\fR locates the LDAP URL associated with a distinguished
name. The number of nameparts in the supplied distinguished name must be
provided. The specified directory entry is searched for a labeledURI attribute.
If successful then the LDAP URL is returned. If unsuccessful then that entry's
parent is searched and so on until the target distinguished name is reduced to
only two nameparts. If an error is encountered then zero is returned, otherwise
a string URL is returned. The caller should free the returned string if it is
non-zero.
.SH RETURN VALUES
.sp
.LP
Upon error, one of these values is returned for \fBldap_url_parse()\fR:
.sp
.ne 2
.na
\fB\fBLDAP_URL_ERR_BADSCOPE\fR\fR
.ad
.RS 25n
URL scope string is invalid.
.RE

.sp
.ne 2
.na
\fB\fBLDAP_URL_ERR_HOSTPORT\fR\fR
.ad
.RS 25n
URL hostport is invalid.
.RE

.sp
.ne 2
.na
\fB\fBLDAP_URL_ERR_MEM\fR\fR
.ad
.RS 25n
Can't allocate memory space.
.RE

.sp
.ne 2
.na
\fB\fBLDAP_URL_ERR_NODN\fR\fR
.ad
.RS 25n
URL has no DN (required).
.RE

.sp
.ne 2
.na
\fB\fBLDAP_URL_ERR_NOTLDAP\fR\fR
.ad
.RS 25n
URL doesn't begin with \fBldap://\fR.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for a description of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Evolving
.TE

.SH SEE ALSO
.sp
.LP
.BR ldap (3LDAP),
.BR ldap_search (3LDAP),
.BR attributes (7)
.sp
.LP
\fBAn\fR \fBLDAP\fR \fBURL\fR \fBFormat,\fR Tim Howes and Mark Smith, December
1995. Internet Draft (work in progress). Currently available at this URL.
.sp
.in +2
.nf
ftp://ds.internic.net/internet-drafts/draft-ietf-asid-ldap-format-03.txt
.fi
.in -2