Adding upstream version 2.4.57+dfsg.upstream/2.4.57+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 423 insertions, 0 deletions

diff --git a/libraries/librewrite/session.c b/libraries/librewrite/session.c
new file mode 100644
index 0000000..6e2e048
--- /dev/null
+++ b/libraries/librewrite/session.c
@@ -0,0 +1,423 @@
+/* $OpenLDAP$ */
+/* 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;
+}
+