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74fa239a20
- librewrite, for string rewriting; it may be used in back-ldap
by configuring with '--enable-rewrite'. It must be used in
back-meta. There's a text file, 'libraries/librewrite/RATIONALE',
that explains the usage and the features. More comprehensive
documentation will follow.
- enhancements of back-ldap (ITS#989,ITS#998,ITS#1002,ITS#1054 and ITS#1137)
including dn rewriting, a fix to group acl matching and so
- back-meta: a new backend that proxies a set of remote servers
by spawning queries. It uses portions of back-ldap and the rewrite
capabilities of librewrite. It can be compiled by configuring
with `--enable-ldap --enable-rewrite --enable-meta'.
There's a text file, 'servers/slapd/back-meta/Documentation', that
describes the main features and config statements.
Note: someone (Kurt?) should run 'autoconf' and commit 'configure' as
my autoconf version must be different: my configures contain a number
of differences and I didn't feel comfortable in adding them :)
331 lines
7.6 KiB
C
331 lines
7.6 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2000 Pierangelo Masarati, <ando@sys-net.it>
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* All rights reserved.
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*
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* Permission is granted to anyone to use this software for any purpose
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* on any computer system, and to alter it and redistribute it, subject
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* to the following restrictions:
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*
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* 1. The author is not responsible for the consequences of use of this
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* software, no matter how awful, even if they arise from flaws in it.
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*
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* 2. The origin of this software must not be misrepresented, either by
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* explicit claim or by omission. Since few users ever read sources,
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* credits should appear in the documentation.
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*
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* 3. Altered versions must be plainly marked as such, and must not be
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* misrepresented as being the original software. Since few users
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* ever read sources, credits should appear in the documentation.
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*
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* 4. This notice may not be removed or altered.
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*
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******************************************************************************/
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#include <portable.h>
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#include "rewrite-int.h"
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/*
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* Compares two cookies
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*/
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static int
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rewrite_cookie_cmp(
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const void *c1,
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const void *c2
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)
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{
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struct rewrite_session *s1, *s2;
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s1 = ( struct rewrite_session * )c1;
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s2 = ( struct rewrite_session * )c2;
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assert( s1 != NULL );
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assert( s2 != NULL );
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assert( s1->ls_cookie != NULL );
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assert( s2->ls_cookie != NULL );
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return ( ( s1->ls_cookie < s2->ls_cookie ) ? -1 :
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( ( s1->ls_cookie > s2->ls_cookie ) ? 1 : 0 ) );
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}
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/*
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* Duplicate cookies?
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*/
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static int
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rewrite_cookie_dup(
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void *c1,
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void *c2
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)
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{
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struct rewrite_session *s1, *s2;
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s1 = ( struct rewrite_session * )c1;
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s2 = ( struct rewrite_session * )c2;
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assert( s1 != NULL );
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assert( s2 != NULL );
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assert( s1->ls_cookie != NULL );
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assert( s2->ls_cookie != NULL );
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return ( ( s1->ls_cookie == s2->ls_cookie ) ? -1 : 0 );
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}
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/*
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* Inits a session
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*/
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struct rewrite_session *
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rewrite_session_init(
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struct rewrite_info *info,
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const void *cookie
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)
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{
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struct rewrite_session *session;
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int rc;
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assert( info != NULL );
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assert( cookie != NULL );
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session = calloc( sizeof( struct rewrite_session ), 1 );
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if ( session == NULL ) {
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return NULL;
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}
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session->ls_cookie = ( void * )cookie;
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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if ( ldap_pvt_thread_rdwr_init( &session->ls_vars_mutex ) ) {
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free( session );
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return NULL;
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}
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ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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rc = avl_insert( &info->li_cookies, ( caddr_t )session,
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rewrite_cookie_cmp, rewrite_cookie_dup );
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info->li_num_cookies++;
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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if ( rc != 0 ) {
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free( session );
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return NULL;
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}
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return session;
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}
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/*
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* Fetches a session
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*/
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struct rewrite_session *
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rewrite_session_find(
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struct rewrite_info *info,
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const void *cookie
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)
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{
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struct rewrite_session *session, tmp;
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assert( info != NULL );
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assert( cookie != NULL );
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tmp.ls_cookie = ( void * )cookie;
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_rlock( &info->li_cookies_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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session = ( struct rewrite_session * )avl_find( info->li_cookies,
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( caddr_t )&tmp, rewrite_cookie_cmp );
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_runlock( &info->li_cookies_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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return session;
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}
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/*
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* Defines and inits a var with session scope
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*/
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int
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rewrite_session_var_set(
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struct rewrite_info *info,
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const void *cookie,
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const char *name,
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const char *value
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)
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{
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struct rewrite_session *session;
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struct rewrite_var *var;
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assert( info != NULL );
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assert( cookie != NULL );
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assert( name != NULL );
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assert( value != NULL );
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session = rewrite_session_find( info, cookie );
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if ( session == NULL ) {
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session = rewrite_session_init( info, cookie );
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}
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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var = rewrite_var_find( session->ls_vars, name );
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if ( var != NULL ) {
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assert( var->lv_value.bv_val != NULL );
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free( var->lv_value.bv_val );
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var->lv_value.bv_val = strdup( value );
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var->lv_value.bv_len = strlen( value );
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} else {
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var = rewrite_var_insert( &session->ls_vars, name, value );
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if ( var == NULL ) {
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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return REWRITE_ERR;
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}
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}
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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return REWRITE_SUCCESS;
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}
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/*
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* Gets a var with session scope
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*/
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int
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rewrite_session_var_get(
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struct rewrite_info *info,
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const void *cookie,
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const char *name,
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struct berval *value
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)
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{
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struct rewrite_session *session;
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struct rewrite_var *var;
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assert( info != NULL );
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assert( cookie != NULL );
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assert( name != NULL );
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assert( value != NULL );
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value->bv_val = NULL;
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value->bv_len = 0;
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if ( cookie == NULL ) {
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return REWRITE_ERR;
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}
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session = rewrite_session_find( info, cookie );
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if ( session == NULL ) {
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return REWRITE_ERR;
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}
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_rlock( &session->ls_vars_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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var = rewrite_var_find( session->ls_vars, name );
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if ( var == NULL ) {
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_runlock( &session->ls_vars_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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return REWRITE_ERR;
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} else {
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value->bv_val = strdup( var->lv_value.bv_val );
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value->bv_len = var->lv_value.bv_len;
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}
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_runlock( &session->ls_vars_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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return REWRITE_SUCCESS;
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}
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/*
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* Deletes a session
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*/
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int
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rewrite_session_delete(
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struct rewrite_info *info,
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const void *cookie
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)
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{
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struct rewrite_session *session, tmp;
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assert( info != NULL );
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assert( cookie != NULL );
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tmp.ls_cookie = ( void * )cookie;
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session = rewrite_session_find( info, cookie );
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if ( session != NULL ) {
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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rewrite_var_delete( session->ls_vars );
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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}
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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assert( info->li_num_cookies > 0 );
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info->li_num_cookies--;
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/*
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* There is nothing to delete in the return value
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*/
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avl_delete( &info->li_cookies, ( caddr_t )&tmp, rewrite_cookie_cmp );
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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return REWRITE_SUCCESS;
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}
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/*
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* Destroys the cookie tree
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*/
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int
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rewrite_session_destroy(
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struct rewrite_info *info
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)
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{
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int count;
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assert( info != NULL );
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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/*
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* Should call per-session destruction routine ...
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*/
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count = avl_free( info->li_cookies, NULL );
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info->li_cookies = NULL;
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assert( count == info->li_num_cookies );
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info->li_num_cookies = 0;
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#ifdef USE_REWRITE_LDAP_PVT_THREADS
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ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
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#endif /* USE_REWRITE_LDAP_PVT_THREADS */
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return REWRITE_SUCCESS;
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}
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