mirror of
https://git.openldap.org/openldap/openldap.git
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138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 1998-2020 The OpenLDAP Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#include "portable.h"
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#include <ac/socket.h>
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#include <ac/errno.h>
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#include <ac/string.h>
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#include <ac/time.h>
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#include <ac/unistd.h>
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#include "lutil.h"
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#include "slap.h"
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static void upstream_destroy( Connection *c );
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void
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upstream_read_cb( evutil_socket_t s, short what, void *arg )
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{
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Connection *c = arg;
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ldap_pvt_thread_mutex_lock( &c->c_mutex );
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upstream_destroy( c );
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}
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void
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upstream_write_cb( evutil_socket_t s, short what, void *arg )
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{
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Connection *c = arg;
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ldap_pvt_thread_mutex_lock( &c->c_io_mutex );
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Debug( LDAP_DEBUG_CONNS, "upstream_write_cb: "
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"have something to write to upstream %lu\n",
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c->c_connid );
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if ( ber_flush( c->c_sb, c->c_pendingber, 1 ) ) {
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int err = sock_errno();
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if ( err != EWOULDBLOCK && err != EAGAIN ) {
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ldap_pvt_thread_mutex_lock( &c->c_mutex );
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Debug( LDAP_DEBUG_ANY, "upstream_write_cb: "
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"error writing to connection %ld\n",
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c->c_connid );
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ldap_pvt_thread_mutex_unlock( &c->c_io_mutex );
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upstream_destroy( c );
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return;
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}
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event_add( c->c_write_event, 0 );
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}
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c->c_pendingber = NULL;
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ldap_pvt_thread_mutex_unlock( &c->c_io_mutex );
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}
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Connection *
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upstream_init( ber_socket_t s, Backend *backend )
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{
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Connection *c;
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struct event_base *base = slap_get_base( s );
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struct event *event;
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int flags = (backend->b_tls == LLOAD_LDAPS) ? CONN_IS_TLS : 0;
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assert( backend != NULL );
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c = connection_init( s, backend->b_host, flags );
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event = event_new( base, s, EV_READ|EV_PERSIST, upstream_read_cb, c );
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if ( !event ) {
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Debug( LDAP_DEBUG_ANY, "Read event could not be allocated\n" );
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goto fail;
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}
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event_add( event, NULL );
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c->c_read_event = event;
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event = event_new( base, s, EV_WRITE, upstream_write_cb, c );
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if ( !event ) {
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Debug( LDAP_DEBUG_ANY, "Write event could not be allocated\n" );
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goto fail;
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}
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/* We only register the write event when we have data pending */
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c->c_write_event = event;
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c->c_private = backend;
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ldap_pvt_thread_mutex_unlock( &c->c_mutex );
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return c;
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fail:
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if ( c->c_write_event ) {
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event_del( c->c_write_event );
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event_free( c->c_write_event );
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}
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if ( c->c_read_event ) {
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event_del( c->c_read_event );
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event_free( c->c_read_event );
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}
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connection_destroy( c );
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return NULL;
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}
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static void
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upstream_destroy( Connection *c )
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{
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Backend *b = c->c_private;
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c->c_struct_state = SLAP_C_UNINITIALIZED;
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ldap_pvt_thread_mutex_unlock( &c->c_mutex );
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ldap_pvt_thread_mutex_lock( &b->b_lock );
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if ( !(b->b_conns == c) ) {
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ldap_pvt_thread_mutex_unlock( &b->b_lock );
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return;
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}
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b->b_conns = NULL;
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ldap_pvt_thread_mutex_unlock( &b->b_lock );
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ldap_pvt_thread_pool_submit( &connection_pool, backend_connect, b );
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ldap_pvt_thread_mutex_lock( &c->c_mutex );
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event_del( c->c_read_event );
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event_free( c->c_read_event );
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event_del( c->c_write_event );
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event_free( c->c_write_event );
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connection_destroy( c );
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}
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