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RedHat 9 (Linux i386) - man page for ldap_build_filter (redhat section 3)

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)

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