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/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2000-2021 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* ACKNOWLEDGEMENT:
* This work was initially developed by Pierangelo Masarati for
* inclusion in OpenLDAP Software.
*/
#include <portable.h>
#include "rewrite-int.h"
/*
* Compares two cookies
*/
static int
rewrite_cookie_cmp(
const void *c1,
const void *c2
)
{
const struct rewrite_session *s1, *s2;
s1 = ( const struct rewrite_session * )c1;
s2 = ( const struct rewrite_session * )c2;
assert( s1 != NULL );
assert( s2 != NULL );
assert( s1->ls_cookie != NULL );
assert( s2->ls_cookie != NULL );
return ( ( s1->ls_cookie < s2->ls_cookie ) ? -1 :
( ( s1->ls_cookie > s2->ls_cookie ) ? 1 : 0 ) );
}
/*
* Duplicate cookies?
*/
static int
rewrite_cookie_dup(
void *c1,
void *c2
)
{
struct rewrite_session *s1, *s2;
s1 = ( struct rewrite_session * )c1;
s2 = ( struct rewrite_session * )c2;
assert( s1 != NULL );
assert( s2 != NULL );
assert( s1->ls_cookie != NULL );
assert( s2->ls_cookie != NULL );
assert( s1->ls_cookie != s2->ls_cookie );
return ( ( s1->ls_cookie == s2->ls_cookie ) ? -1 : 0 );
}
/*
* Inits a session
*/
struct rewrite_session *
rewrite_session_init(
struct rewrite_info *info,
const void *cookie
)
{
struct rewrite_session *session, tmp;
int rc;
assert( info != NULL );
assert( cookie != NULL );
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
tmp.ls_cookie = ( void * )cookie;
session = ( struct rewrite_session * )avl_find( info->li_cookies,
( caddr_t )&tmp, rewrite_cookie_cmp );
if ( session ) {
session->ls_count++;
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
return session;
}
session = calloc( sizeof( struct rewrite_session ), 1 );
if ( session == NULL ) {
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
return NULL;
}
session->ls_cookie = ( void * )cookie;
session->ls_count = 1;
#ifdef USE_REWRITE_LDAP_PVT_THREADS
if ( ldap_pvt_thread_mutex_init( &session->ls_mutex ) ) {
free( session );
ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
return NULL;
}
if ( ldap_pvt_thread_rdwr_init( &session->ls_vars_mutex ) ) {
ldap_pvt_thread_mutex_destroy( &session->ls_mutex );
free( session );
ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
return NULL;
}
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
rc = avl_insert( &info->li_cookies, ( caddr_t )session,
rewrite_cookie_cmp, rewrite_cookie_dup );
info->li_num_cookies++;
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
if ( rc != 0 ) {
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex );
ldap_pvt_thread_mutex_destroy( &session->ls_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
free( session );
return NULL;
}
return session;
}
/*
* Fetches a session
*/
struct rewrite_session *
rewrite_session_find(
struct rewrite_info *info,
const void *cookie
)
{
struct rewrite_session *session, tmp;
assert( info != NULL );
assert( cookie != NULL );
tmp.ls_cookie = ( void * )cookie;
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_rlock( &info->li_cookies_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
session = ( struct rewrite_session * )avl_find( info->li_cookies,
( caddr_t )&tmp, rewrite_cookie_cmp );
#ifdef USE_REWRITE_LDAP_PVT_THREADS
if ( session ) {
ldap_pvt_thread_mutex_lock( &session->ls_mutex );
session->ls_count++;
}
ldap_pvt_thread_rdwr_runlock( &info->li_cookies_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
return session;
}
/*
* Returns a session
*/
void
rewrite_session_return(
struct rewrite_info *info,
struct rewrite_session *session
)
{
assert( session != NULL );
session->ls_count--;
ldap_pvt_thread_mutex_unlock( &session->ls_mutex );
}
/*
* Defines and inits a var with session scope
*/
int
rewrite_session_var_set_f(
struct rewrite_info *info,
const void *cookie,
const char *name,
const char *value,
int flags
)
{
struct rewrite_session *session;
struct rewrite_var *var;
assert( info != NULL );
assert( cookie != NULL );
assert( name != NULL );
assert( value != NULL );
session = rewrite_session_find( info, cookie );
if ( session == NULL ) {
session = rewrite_session_init( info, cookie );
if ( session == NULL ) {
return REWRITE_ERR;
}
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_mutex_lock( &session->ls_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
}
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
var = rewrite_var_find( session->ls_vars, name );
if ( var != NULL ) {
assert( var->lv_value.bv_val != NULL );
(void)rewrite_var_replace( var, value, flags );
} else {
var = rewrite_var_insert_f( &session->ls_vars, name, value, flags );
if ( var == NULL ) {
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
rewrite_session_return( info, session );
return REWRITE_ERR;
}
}
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
rewrite_session_return( info, session );
return REWRITE_SUCCESS;
}
/*
* Gets a var with session scope
*/
int
rewrite_session_var_get(
struct rewrite_info *info,
const void *cookie,
const char *name,
struct berval *value
)
{
struct rewrite_session *session;
struct rewrite_var *var;
int rc = REWRITE_SUCCESS;
assert( info != NULL );
assert( cookie != NULL );
assert( name != NULL );
assert( value != NULL );
value->bv_val = NULL;
value->bv_len = 0;
if ( cookie == NULL ) {
return REWRITE_ERR;
}
session = rewrite_session_find( info, cookie );
if ( session == NULL ) {
return REWRITE_ERR;
}
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_rlock( &session->ls_vars_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
var = rewrite_var_find( session->ls_vars, name );
if ( var != NULL ) {
value->bv_val = strdup( var->lv_value.bv_val );
value->bv_len = var->lv_value.bv_len;
}
if ( var == NULL || value->bv_val == NULL ) {
rc = REWRITE_ERR;
}
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_runlock( &session->ls_vars_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
rewrite_session_return( info, session );
return rc;
}
static void
rewrite_session_clean( void *v_session )
{
struct rewrite_session *session = (struct rewrite_session *)v_session;
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
rewrite_var_delete( session->ls_vars );
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex );
ldap_pvt_thread_mutex_unlock( &session->ls_mutex );
ldap_pvt_thread_mutex_destroy( &session->ls_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
}
static void
rewrite_session_free( void *v_session )
{
struct rewrite_session *session = (struct rewrite_session *)v_session;
ldap_pvt_thread_mutex_lock( &session->ls_mutex );
rewrite_session_clean( v_session );
free( v_session );
}
/*
* Deletes a session
*/
int
rewrite_session_delete(
struct rewrite_info *info,
const void *cookie
)
{
struct rewrite_session *session, tmp = { 0 };
assert( info != NULL );
assert( cookie != NULL );
session = rewrite_session_find( info, cookie );
if ( session == NULL ) {
return REWRITE_SUCCESS;
}
if ( --session->ls_count > 0 ) {
rewrite_session_return( info, session );
return REWRITE_SUCCESS;
}
rewrite_session_clean( session );
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
assert( info->li_num_cookies > 0 );
info->li_num_cookies--;
/*
* There is nothing to delete in the return value
*/
tmp.ls_cookie = ( void * )cookie;
avl_delete( &info->li_cookies, ( caddr_t )&tmp, rewrite_cookie_cmp );
free( session );
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
return REWRITE_SUCCESS;
}
/*
* Destroys the cookie tree
*/
int
rewrite_session_destroy(
struct rewrite_info *info
)
{
int count;
assert( info != NULL );
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
/*
* Should call per-session destruction routine ...
*/
count = avl_free( info->li_cookies, rewrite_session_free );
info->li_cookies = NULL;
#if 0
fprintf( stderr, "count = %d; num_cookies = %d\n",
count, info->li_num_cookies );
#endif
assert( count == info->li_num_cookies );
info->li_num_cookies = 0;
#ifdef USE_REWRITE_LDAP_PVT_THREADS
ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
#endif /* USE_REWRITE_LDAP_PVT_THREADS */
return REWRITE_SUCCESS;
}
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