LDAP_GET_DN(3)             Library Functions Manual             LDAP_GET_DN(3)

       ldap_get_dn,  ldap_explode_dn,  ldap_explode_rdn, ldap_dn2ufn - LDAP DN
       handling routines

       OpenLDAP LDAP (libldap, -lldap)

       #include <ldap.h>

       char *ldap_get_dn( LDAP *ld, LDAPMessage *entry )

       int ldap_str2dn( const char *str, LDAPDN *dn, unsigned flags )

       void ldap_dnfree( LDAPDN dn )

       int ldap_dn2str( LDAPDN dn, char **str, unsigned flags )

       char **ldap_explode_dn( const char *dn, int notypes )

       char **ldap_explode_rdn( const char *rdn, int notypes )

       char *ldap_dn2ufn( const char * dn )

       char *ldap_dn2dcedn( const char * dn )

       char *ldap_dcedn2dn( const char * dn )

       char *ldap_dn2ad_canonical( const char * dn )

       These routines allow LDAP entry names (Distinguished Names, or DNs)  to
       be  obtained, parsed, converted to a user-friendly form, and tested.  A
       DN has the form described in RFC  4414  "Lightweight  Directory  Access
       Protocol (LDAP): String Representation of Distinguished Names".

       The  ldap_get_dn() routine takes an entry as returned by ldap_first_en-
       try(3) or ldap_next_entry(3) and returns a  copy  of  the  entry's  DN.
       Space  for  the  DN will be obtained dynamically and should be freed by
       the caller using ldap_memfree(3).

       ldap_str2dn() parses a string representation of  a  distinguished  name
       contained  in  str  into  its  components,  which  are  stored in dn as
       ldap_ava structures, arranged in LDAPAVA, LDAPRDN,  and  LDAPDN  terms.
       Space  for  dn  will be obtained dynamically and should be freed by the
       caller using ldap_dnfree(3).  The LDAPDN is defined as:

       typedef struct ldap_ava {
           struct berval la_attr;
           struct berval la_value;
           unsigned la_flags;
       } LDAPAVA;

       typedef LDAPAVA** LDAPRDN;
       typedef LDAPRDN* LDAPDN;

       The attribute types and the attribute values are not  normalized.   The
       la_flags  can  be either LDAP_AVA_STRING or LDAP_AVA_BINARY, the latter
       meaning that the value is BER/DER encoded and thus must be  represented
       as, quoting from RFC 4514, " ... an octothorpe character ('#' ASCII 35)
       followed by the hexadecimal representation of each of the bytes of  the
       BER  encoding  of  the  X.500  AttributeValue."  The flags parameter to
       ldap_str2dn() can be


       which defines what DN syntax is expected (according to  RFC  4514,  RFC
       1779 and DCE, respectively).  The format can be ORed to the flags


       The latter is a shortcut for all the previous limitations.

       LDAP_DN_P_NO_SPACES  does not allow extra spaces in the dn; the default
       is to silently eliminate spaces around AVA separators ('='), RDN compo-
       nent  separators ('+' for LDAPv3/LDAPv2 or ',' for DCE) and RDN separa-
       tors (',' LDAPv3/LDAPv2 or '/' for DCE).

       LDAP_DN_P_NO_SPACE_AFTER_RDN does not allow a single  space  after  RDN

       ldap_dn2str()  performs the inverse operation, yielding in str a string
       representation  of  dn.   It  allows  the  same  values  for  flags  as
       ldap_str2dn(), plus


       for user-friendly naming (RFC 1781) and AD canonical.

       The   following   routines   are  viewed  as  deprecated  in  favor  of
       ldap_str2dn() and ldap_dn2str().  They are provided to  support  legacy

       The  ldap_explode_dn()  routine takes a DN as returned by ldap_get_dn()
       and breaks it up into its component parts.  Each part  is  known  as  a
       Relative Distinguished Name, or RDN.  ldap_explode_dn() returns a NULL-
       terminated array, each component of which contains an RDN from the  DN.
       The  notypes  parameter  is used to request that only the RDN values be
       returned, not their types.  For example, the DN  "cn=Bob,  c=US"  would
       return  as  either { "cn=Bob", "c=US", NULL } or { "Bob", "US", NULL },
       depending on whether notypes was 0 or 1, respectively.  Assertion  val-
       ues  in RDN strings may included escaped characters.  The result can be
       freed by calling ldap_value_free(3).

       Similarly, the ldap_explode_rdn() routine takes an RDN as  returned  by
       ldap_explode_dn(dn,0)  and breaks it up into its "type=value" component
       parts (or just "value", if the notypes parameter  is  set).   Note  the
       value   is   not  unescaped.   The  result  can  be  freed  by  calling

       ldap_dn2ufn() is used to turn a DN as returned by ldap_get_dn(3) into a
       more  user-friendly form, stripping off all type names.  See "Using the
       Directory to Achieve User Friendly Naming" (RFC 1781) for more  details
       on  the  UFN  format.  Due to the ambiguous nature of the format, it is
       generally only used for display purposes.  The space for  the  UFN  re-
       turned  is obtained dynamically and the user is responsible for freeing
       it via a call to ldap_memfree(3).

       ldap_dn2dcedn() is used to turn a DN as returned by ldap_get_dn(3) into
       a  DCE-style  DN, e.g. a string with most-significant to least signifi-
       cant rdns separated by slashes ('/'); rdn components are  separated  by
       commas  (',').  Only printable chars (e.g. LDAPv2 printable string) are
       allowed, at least in this implementation.  ldap_dcedn2dn() performs the
       opposite operation.  ldap_dn2ad_canonical() turns a DN into a AD canon-
       ical name, which is basically a DCE dn with  attribute  types  omitted.
       The  trailing  domain, if present, is turned in a DNS-like domain.  The
       space for the returned value is obtained dynamically and  the  user  is
       responsible for freeing it via a call to ldap_memfree(3).

       If  an error occurs in ldap_get_dn(), NULL is returned and the ld_errno
       field in the ld parameter is set to indicate the error.   See  ldap_er-
       ror(3)  for  a description of possible error codes.  ldap_explode_dn(),
       ldap_explode_rdn(),  ldap_dn2ufn(),  ldap_dn2dcedn(),  ldap_dcedn2dn(),
       and ldap_dn2ad_canonical() will return NULL with errno(3) set appropri-
       ately in case of trouble.

       These routines dynamically allocate memory that the caller must free.

       ldap(3),    ldap_error(3),    ldap_first_entry(3),     ldap_memfree(3),

       OpenLDAP  Software  is developed and maintained by The OpenLDAP Project
       <http://www.openldap.org/>.  OpenLDAP Software is derived from the Uni-
       versity of Michigan LDAP 3.3 Release.

OpenLDAP                          2020/01/30                    LDAP_GET_DN(3)
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