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LDAP_SCHEMA(3)                                                  LDAP_SCHEMA(3)

       ldap_str2syntax,  ldap_syntax2str,  ldap_syntax2name,  ldap_syntax_free,  ldap_str2matchingrule,  ldap_matchin-
       grule2str,  ldap_matchingrule2name,  ldap_matchingrule_free,  ldap_str2attributetype,   ldap_attributetype2str,
       ldap_attributetype2name,   ldap_attributetype_free,  ldap_str2objectclass,  ldap_objectclass2str,  ldap_object-
       class2name, ldap_objectclass_free, ldap_scherr2str - Schema definition handling routines

       OpenLDAP LDAP (libldap, -lldap)

       #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;

       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;

       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;

       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;

       LDAPObjectClass * oc;

       char * ldap_scherr2str(code)
       int code;

       These routines are used to parse schema definitions in the syntax defined in RFC 4512 into structs  and  handle
       these  structs.  These routines 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
       syntax recognized.  The following values are defined:

              strict parsing according to RFC 4512.

              permit definitions that do not contain an initial OID.

              permit quotes around some items that should not have them.

              permit a descr instead of a numeric OID in places where the syntax expect the latter.

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

              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:

              The answer to the question is no.

              The answer to the question is yes.

       For attribute types, the following usages are possible:

              the attribute type is non-operational.

              the attribute type is operational and is pertinent to the directory itself, i.e. it has the  same  value
              on all servers that master the entry containing this attribute type.

              the attribute type is operational and is pertinent to replication, shadowing or other distributed direc-
              tory aspect.  TBC.

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

       Object classes can be of three kinds:

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

              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.

              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 description 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 pars-
       ing routines and can adopt the following values:

              Out of memory.

              Unexpected token.

              Missing opening parenthesis.

              Missing closing parenthesis.

              Expecting digit.

              Expecting a name.

              Bad description.

              Bad superiors.

              Duplicate option.

              Unexpected end of data.


       OpenLDAP  Software  is  developed  and maintained by The OpenLDAP Project <>;.  OpenLDAP
       Software is derived from University of Michigan LDAP 3.3 Release.

OpenLDAP 2.4.40                   2014/09/20                    LDAP_SCHEMA(3)