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LDAP_SCHEMA(3)                                                  LDAP_SCHEMA(3)

NAME
       ldap_str2syntax,  ldap_syntax2str,  ldap_syntax2name, ldap_syntax_free,
       ldap_str2matchingrule,  ldap_matchingrule2str,  ldap_matchingrule2name,
       ldap_matchingrule_free, ldap_str2attributetype, ldap_attributetype2str,
       ldap_attributetype2name, ldap_attributetype_free, ldap_str2objectclass,
       ldap_objectclass2str,   ldap_objectclass2name,   ldap_objectclass_free,
       ldap_scherr2str - Schema definition handling routines

LIBRARY
       OpenLDAP LDAP (libldap, -lldap)

SYNOPSIS
       #include <ldap.h>
       #include <ldap_schema.h>

       LDAPSyntax * ldap_str2syntax(s, code, errp, flags)
       const char * s;
       int * code;
       const char ** errp;
       const int flags;

       char * ldap_syntax2str(syn)
       const LDAPSyntax * syn;

       const char * ldap_syntax2name(syn)
       LDAPSyntax * syn;

       ldap_syntax_free(syn)
       LDAPSyntax * syn;

       LDAPMatchingRule * ldap_str2matchingrule(s, code, errp, flags)
       const char * s;
       int * code;
       const char ** errp;
       const int flags;

       char * ldap_matchingrule2str(mr);
       const LDAPMatchingRule * mr;

       const char * ldap_matchingrule2name(mr)
       LDAPMatchingRule * mr;

       ldap_matchingrule_free(mr)
       LDAPMatchingRule * mr;

       LDAPAttributeType * ldap_str2attributetype(s, code, errp, flags)
       const char * s;
       int * code;
       const char ** errp;
       const int flags;

       char * ldap_attributetype2str(at)
       const LDAPAttributeType * at;

       const char * ldap_attributetype2name(at)
       LDAPAttributeType * at;

       ldap_attributetype_free(at)
       LDAPAttributeType * at;

       LDAPObjectClass * ldap_str2objectclass(s, code, errp, flags)
       const char * s;
       int * code;
       const char ** errp;
       const int flags;

       char * ldap_objectclass2str(oc)
       const LDAPObjectClass * oc;

       const char * ldap_objectclass2name(oc)
       LDAPObjectClass * oc;

       ldap_objectclass_free(oc)
       LDAPObjectClass * oc;

       char * ldap_scherr2str(code)
       int code;

DESCRIPTION
       These routines are used to  parse  schema  definitions  in  the  syntax
       defined  in RFC 4512 into structs and handle these structs.  These rou-
       tines handle four  kinds  of  definitions:  syntaxes,  matching  rules,
       attribute  types  and  object  classes.  For each definition kind, four
       routines are provided.

       ldap_str2xxx() takes a definition in RFC 4512 format in argument s as a
       NUL-terminated  string  and  returns, if possible, a pointer to a newly
       allocated struct of the appropriate kind.  The  caller  is  responsible
       for  freeing  the struct by calling ldap_xxx_free() when not needed any
       longer.  The routine returns NULL if some problem  happened.   In  this
       case,  the  integer  pointed  at by argument code will receive an error
       code (see below the description of ldap_scherr2str() for an explanation
       of  the values) and a pointer to a NUL-terminated string will be placed
       where requested by argument errp , indicating where in argument  s  the
       error  happened, so it must not be freed by the caller.  Argument flags
       is a bit mask of parsing options controlling the relaxation of the syn-
       tax recognized.  The following values are defined:

       LDAP_SCHEMA_ALLOW_NONE
              strict parsing according to RFC 4512.

       LDAP_SCHEMA_ALLOW_NO_OID
              permit definitions that do not contain an initial OID.

       LDAP_SCHEMA_ALLOW_QUOTED
              permit quotes around some items that should not have them.

       LDAP_SCHEMA_ALLOW_DESCR
              permit a descr instead of a numeric OID in places where the syn-
              tax expect the latter.

       LDAP_SCHEMA_ALLOW_DESCR_PREFIX
              permit that the initial numeric OID contains a prefix  in  descr
              format.

       LDAP_SCHEMA_ALLOW_ALL
              be very liberal, include all options.

       The structures returned are as follows:

              typedef struct ldap_schema_extension_item {
                      char *lsei_name;        /* Extension name */
                      char **lsei_values;     /* Extension values */
              } LDAPSchemaExtensionItem;

              typedef struct ldap_syntax {
                      char *syn_oid;          /* OID */
                      char **syn_names;       /* Names */
                      char *syn_desc;         /* Description */
                      LDAPSchemaExtensionItem **syn_extensions; /* Extension */
              } LDAPSyntax;

              typedef struct ldap_matchingrule {
                      char *mr_oid;           /* OID */
                      char **mr_names;        /* Names */
                      char *mr_desc;          /* Description */
                      int  mr_obsolete;       /* Is obsolete? */
                      char *mr_syntax_oid;    /* Syntax of asserted values */
                      LDAPSchemaExtensionItem **mr_extensions; /* Extensions */
              } LDAPMatchingRule;

              typedef struct ldap_attributetype {
                      char *at_oid;           /* OID */
                      char **at_names;        /* Names */
                      char *at_desc;          /* Description */
                      int  at_obsolete;       /* Is obsolete? */
                      char *at_sup_oid;       /* OID of superior type */
                      char *at_equality_oid;  /* OID of equality matching rule */
                      char *at_ordering_oid;  /* OID of ordering matching rule */
                      char *at_substr_oid;    /* OID of substrings matching rule */
                      char *at_syntax_oid;    /* OID of syntax of values */
                      int  at_syntax_len;     /* Suggested minimum maximum length */
                      int  at_single_value;   /* Is single-valued?  */
                      int  at_collective;     /* Is collective? */
                      int  at_no_user_mod;    /* Are changes forbidden through LDAP? */
                      int  at_usage;          /* Usage, see below */
                      LDAPSchemaExtensionItem **at_extensions; /* Extensions */
              } LDAPAttributeType;

              typedef struct ldap_objectclass {
                      char *oc_oid;           /* OID */
                      char **oc_names;        /* Names */
                      char *oc_desc;          /* Description */
                      int  oc_obsolete;       /* Is obsolete? */
                      char **oc_sup_oids;     /* OIDs of superior classes */
                      int  oc_kind;           /* Kind, see below */
                      char **oc_at_oids_must; /* OIDs of required attribute types */
                      char **oc_at_oids_may;  /* OIDs of optional attribute types */
                      LDAPSchemaExtensionItem **oc_extensions; /* Extensions */
              } LDAPObjectClass;

       Some integer fields (those described with a question mark) have a truth
       value, for these fields the possible values are:

       LDAP_SCHEMA_NO
              The answer to the question is no.

       LDAP_SCHEMA_YES
              The answer to the question is yes.

       For attribute types, the following usages are possible:

       LDAP_SCHEMA_USER_APPLICATIONS
              the attribute type is non-operational.

       LDAP_SCHEMA_DIRECTORY_OPERATION
              the attribute type is operational and is pertinent to the direc-
              tory itself, i.e. it has the same value on all servers that mas-
              ter the entry containing this attribute type.

       LDAP_SCHEMA_DISTRIBUTED_OPERATION
              the attribute type is operational and is pertinent  to  replica-
              tion, shadowing or other distributed directory aspect.  TBC.

       LDAP_SCHEMA_DSA_OPERATION
              the attribute type is operational and is pertinent to the direc-
              tory server itself, i.e. it may have different  values  for  the
              same entry when retrieved from different servers that master the
              entry.

       Object classes can be of three kinds:

       LDAP_SCHEMA_ABSTRACT
              the object class is abstract, i.e. there cannot  be  entries  of
              this class alone.

       LDAP_SCHEMA_STRUCTURAL
              the  object class is structural, i.e. it describes the main role
              of the entry.  On some servers, once the entry  is  created  the
              set  of  structural  object  classes assigned cannot be changed:
              none of those present can be  removed  and  none  other  can  be
              added.

       LDAP_SCHEMA_AUXILIARY
              the  object  class  is auxiliary, i.e. it is intended to go with
              other, structural,  object  classes.   These  can  be  added  or
              removed  at  any time if attribute types are added or removed at
              the same time as needed by the set of object  classes  resulting
              from the operation.

       Routines ldap_xxx2name() return a canonical name for the definition.

       Routines  ldap_xxx2str()  return  a string representation in the format
       described by RFC 4512 of the struct passed in the argument.  The string
       is  a  newly  allocated string that must be freed by the caller.  These
       routines may return NULL if no memory can be allocated for the  string.

       ldap_scherr2str()  returns a NUL-terminated string with a text descrip-
       tion of the error found.  This is a pointer to a  static  area,  so  it
       must  not  be freed by the caller.  The argument code comes from one of
       the parsing routines and can adopt the following values:

       LDAP_SCHERR_OUTOFMEM
              Out of memory.

       LDAP_SCHERR_UNEXPTOKEN
              Unexpected token.

       LDAP_SCHERR_NOLEFTPAREN
              Missing opening parenthesis.

       LDAP_SCHERR_NORIGHTPAREN
              Missing closing parenthesis.

       LDAP_SCHERR_NODIGIT
              Expecting digit.

       LDAP_SCHERR_BADNAME
              Expecting a name.

       LDAP_SCHERR_BADDESC
              Bad description.

       LDAP_SCHERR_BADSUP
              Bad superiors.

       LDAP_SCHERR_DUPOPT
              Duplicate option.

       LDAP_SCHERR_EMPTY
              Unexpected end of data.

SEE ALSO
       ldap(3)

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

OpenLDAP 2.4.11                   2008/07/16                    LDAP_SCHEMA(3)

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