LDAP_GETFILTER(3) Library Functions Manual LDAP_GETFILTER(3)
NAME
ldap_init_getfilter, ldap_init_getfilter_buf, ldap_getfilter_free, ldap_getfirstfilter, ldap_getnextfilter, ldap_build_filter - LDAP filter
generating routines
SYNOPSIS
#include <ldap.h>
#define LDAP_FILT_MAXSIZ 1024
typedef struct ldap_filt_info {
char *lfi_filter;
char *lfi_desc;
int lfi_scope;
int lfi_isexact;
struct ldap_filt_info *lfi_next;
} LDAPFiltInfo;
typedef struct ldap_filt_list {
char *lfl_tag;
char *lfl_pattern;
char *lfl_delims;
LDAPFiltInfo *lfl_ilist;
struct ldap_filt_list *lfl_next;
} LDAPFiltList;
typedef struct ldap_filt_desc {
LDAPFiltList *lfd_filtlist;
LDAPFiltInfo *lfd_curfip;
LDAPFiltInfo lfd_retfi;
char lfd_filter[ LDAP_FILT_MAXSIZ ];
char *lfd_curval;
char *lfd_curvalcopy;
char **lfd_curvalwords;
char *lfd_filtprefix;
char *lfd_filtsuffix;
} LDAPFiltDesc;
LDAPFiltDesc *ldap_init_getfilter( file ) char *file;
LDAPFiltDesc *ldap_init_getfilter_buf( buf, buflen )
char *buf;
long buflen;
ldap_getfilter_free( lfdp )
LDAPFiltDesc *lfdp;
LDAPFiltInfo *ldap_getfirstfilter(lfdp, tagpat, value)
LDAPFiltDesc *lfdp;
char *tagpat;
char *value;
LDAPFiltInfo *ldap_getnextfilter(lfdp)
LDAPFiltDesc *lfdp;
void ldap_setfilteraffixes(lfdp, prefix, suffix)
LDAPFiltDesc *lfdp;
char *prefix;
char *suffix;
void ldap_build_filter( buf, buflen, pattern, prefix, suffix,
attr, value, valwords )
char *buf;
unsigned long buflen;
char *pattern;
char *prefix;
char *suffix;
char *attr;
char *value;
char **valwords;
DESCRIPTION
These routines are used to generate filters to be used in ldap_search(3) or ldap_search_s(3). Either ldap_init_getfilter or ldap_init_get-
filter_buf must be called prior to calling any of the other routines except ldap_build_filter.
ldap_init_getfilter() takes a file name as its only argument. The contents of the file must be a valid LDAP filter configuration file (see
ldapfilter.conf(5)). If the file is successfully read, a pointer to an LDAPFiltDesc is returned. This is an opaque object that is passed
in subsequent get filter calls.
ldap_init_getfilter_buf() reads from buf (whose length is buflen) the LDAP filter configuration information. buf must point to the con-
tents of a valid LDAP filter configuration file (see ldapfilter.conf(5)). If the filter configuration information is successfully read, a
pointer to an LDAPFiltDesc is returned. This is an opaque object that is passed in subsequent get filter calls.
ldap_getfilter_free() deallocates the memory consumed by ldap_init_getfilter. Once it is called, the LDAPFiltDesc is no longer valid and
cannot be used again.
ldap_getfirstfilter() retrieves the first filter that is appropriate for value. Only filter sets that have tags that match the regular
expession tagpat are considered. ldap_getfirstfilter returns a pointer to an LDAPFiltInfo structure, which contains a filter with value
inserted as appropriate in lfi_filter, a text match description in lfi_desc, lfi_scope set to indicate the search scope, and lfi_isexact
set to indicate the type of filter. NULL is returned if no matching filters are found. lfi_scope will be one of LDAP_SCOPE_BASE,
LDAP_SCOPE_ONELEVEL, or LDAP_SCOPE_SUBTREE. lfi_isexact will be zero if the filter has any '~' or '*' characters in it and non-zero other-
wise.
ldap_getnextfilter() retrieves the next appropriate filter in the filter set that was determined when ldap_getfirstfilter was called. It
returns NULL when the list has been exhausted.
ldap_setfilteraffixes() sets a prefix to be prepended and a suffix to be appended to all filters returned in the future.
ldap_build_filter() constructs an LDAP search filter in buf. buflen is the size, in bytes, of the largest filter buf can hold. A pattern
for the desired filter is passed in pattern. Where the string %a appears in the pattern it is replaced with attr. prefix is pre-pended to
the resulting filter, and suffix is appended. Either can be NULL (in which case they are not used). value and valwords are used when the
string %v appears in pattern. See ldapfilter.conf(5) for a description of how %v is handled.
ERRORS
NULL is returned by ldap_init_getfilter if there is an error reading file. NULL is returned by ldap_getfirstfilter and ldap_getnextfilter
when there are no more appropriate filters to return.
NOTES
The return values for all of these functions are declared in the <ldap.h> header file. Some routines may dynamically allocate memory which
the caller must free using the supplied deallocator routines.
FILES
/etc/openldap/ldapfilter.conf
SEE ALSO
ldap(3), ldapfilter.conf(5)
ACKNOWLEDGEMENTS
OpenLDAP is developed and maintained by The OpenLDAP Project (http://www.openldap.org/). OpenLDAP is derived from University of Michigan
LDAP 3.3 Release.
OpenLDAP 2.0.27-Release 22 September 1998 LDAP_GETFILTER(3)