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Diffstat (limited to '')
| -rw-r--r-- | servers/slapd/connection.c | 2141 |
1 files changed, 2141 insertions, 0 deletions
diff --git a/servers/slapd/connection.c b/servers/slapd/connection.c new file mode 100644 index 0000000..44c3fc6 --- /dev/null +++ b/servers/slapd/connection.c @@ -0,0 +1,2141 @@ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 1998-2021 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>. + */ +/* Portions Copyright (c) 1995 Regents of the University of Michigan. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that this notice is preserved and that due credit is given + * to the University of Michigan at Ann Arbor. The name of the University + * may not be used to endorse or promote products derived from this + * software without specific prior written permission. This software + * is provided ``as is'' without express or implied warranty. + */ + +#include "portable.h" + +#include <stdio.h> +#ifdef HAVE_LIMITS_H +#include <limits.h> +#endif + +#include <ac/socket.h> +#include <ac/errno.h> +#include <ac/string.h> +#include <ac/time.h> +#include <ac/unistd.h> + +#include "lutil.h" +#include "slap.h" + +#ifdef LDAP_CONNECTIONLESS +#include "../../libraries/liblber/lber-int.h" /* ber_int_sb_read() */ +#endif + +#ifdef LDAP_SLAPI +#include "slapi/slapi.h" +#endif + +/* protected by connections_mutex */ +static ldap_pvt_thread_mutex_t connections_mutex; +static Connection *connections = NULL; + +static ldap_pvt_thread_mutex_t conn_nextid_mutex; +static unsigned long conn_nextid = SLAPD_SYNC_SYNCCONN_OFFSET; + +static const char conn_lost_str[] = "connection lost"; + +const char * +connection_state2str( int state ) +{ + switch( state ) { + case SLAP_C_INVALID: return "!"; + case SLAP_C_INACTIVE: return "|"; + case SLAP_C_CLOSING: return "C"; + case SLAP_C_ACTIVE: return ""; + case SLAP_C_BINDING: return "B"; + case SLAP_C_CLIENT: return "L"; + } + + return "?"; +} + +static Connection* connection_get( ber_socket_t s ); + +typedef struct conn_readinfo { + Operation *op; + ldap_pvt_thread_start_t *func; + void *arg; + void *ctx; + int nullop; +} conn_readinfo; + +static int connection_input( Connection *c, conn_readinfo *cri ); +static void connection_close( Connection *c ); + +static int connection_op_activate( Operation *op ); +static void connection_op_queue( Operation *op ); +static int connection_resched( Connection *conn ); +static void connection_abandon( Connection *conn ); +static void connection_destroy( Connection *c ); + +static ldap_pvt_thread_start_t connection_operation; + +/* + * Initialize connection management infrastructure. + */ +int connections_init(void) +{ + int i; + + assert( connections == NULL ); + + if( connections != NULL) { + Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n", + 0, 0, 0 ); + return -1; + } + + /* should check return of every call */ + ldap_pvt_thread_mutex_init( &connections_mutex ); + ldap_pvt_thread_mutex_init( &conn_nextid_mutex ); + + connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) ); + + if( connections == NULL ) { + Debug( LDAP_DEBUG_ANY, "connections_init: " + "allocation (%d*%ld) of connection array failed\n", + dtblsize, (long) sizeof(Connection), 0 ); + return -1; + } + + assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED ); + assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED ); + + for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i; + + /* + * per entry initialization of the Connection array initialization + * will be done by connection_init() + */ + + return 0; +} + +/* + * Destroy connection management infrastructure. + */ + +int connections_destroy(void) +{ + ber_socket_t i; + + /* should check return of every call */ + + if( connections == NULL) { + Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n", + 0, 0, 0 ); + return -1; + } + + for ( i = 0; i < dtblsize; i++ ) { + if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) { + ber_sockbuf_free( connections[i].c_sb ); + ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex ); + ldap_pvt_thread_mutex_destroy( &connections[i].c_write1_mutex ); + ldap_pvt_thread_mutex_destroy( &connections[i].c_write2_mutex ); + ldap_pvt_thread_cond_destroy( &connections[i].c_write1_cv ); + ldap_pvt_thread_cond_destroy( &connections[i].c_write2_cv ); +#ifdef LDAP_SLAPI + if ( slapi_plugins_used ) { + slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, + &connections[i] ); + } +#endif + } + } + + free( connections ); + connections = NULL; + + ldap_pvt_thread_mutex_destroy( &connections_mutex ); + ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex ); + return 0; +} + +/* + * shutdown all connections + */ +int connections_shutdown(void) +{ + ber_socket_t i; + + for ( i = 0; i < dtblsize; i++ ) { + if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) { + ldap_pvt_thread_mutex_lock( &connections[i].c_mutex ); + if( connections[i].c_struct_state == SLAP_C_USED ) { + + /* give persistent clients a chance to cleanup */ + if( connections[i].c_conn_state == SLAP_C_CLIENT ) { + ldap_pvt_thread_pool_submit( &connection_pool, + connections[i].c_clientfunc, connections[i].c_clientarg ); + } else { + /* c_mutex is locked */ + connection_closing( &connections[i], "slapd shutdown" ); + connection_close( &connections[i] ); + } + } + ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex ); + } + } + + return 0; +} + +/* + * Timeout idle connections. + */ +int connections_timeout_idle(time_t now) +{ + int i = 0, writers = 0; + ber_socket_t connindex; + Connection* c; + time_t old; + + old = slapd_get_writetime(); + + for( c = connection_first( &connindex ); + c != NULL; + c = connection_next( c, &connindex ) ) + { + /* Don't timeout a slow-running request or a persistent + * outbound connection. But if it has a writewaiter, see + * if the waiter has been there too long. + */ + if(( c->c_n_ops_executing && !c->c_writewaiter) + || c->c_conn_state == SLAP_C_CLIENT ) { + continue; + } + + if( global_idletimeout && + difftime( c->c_activitytime+global_idletimeout, now) < 0 ) { + /* close it */ + connection_closing( c, "idletimeout" ); + connection_close( c ); + i++; + continue; + } + if ( c->c_writewaiter && global_writetimeout ) { + writers = 1; + if( difftime( c->c_activitytime+global_writetimeout, now) < 0 ) { + /* close it */ + connection_closing( c, "writetimeout" ); + connection_close( c ); + i++; + continue; + } + } + } + connection_done( c ); + if ( old && !writers ) + slapd_clr_writetime( old ); + + return i; +} + +/* Drop all client connections */ +void connections_drop() +{ + Connection* c; + ber_socket_t connindex; + + for( c = connection_first( &connindex ); + c != NULL; + c = connection_next( c, &connindex ) ) + { + /* Don't close a slow-running request or a persistent + * outbound connection. + */ + if(( c->c_n_ops_executing && !c->c_writewaiter) + || c->c_conn_state == SLAP_C_CLIENT ) { + continue; + } + connection_closing( c, "dropping" ); + connection_close( c ); + } + connection_done( c ); +} + +static Connection* connection_get( ber_socket_t s ) +{ + Connection *c; + + Debug( LDAP_DEBUG_ARGS, + "connection_get(%ld)\n", + (long) s, 0, 0 ); + + assert( connections != NULL ); + + if(s == AC_SOCKET_INVALID) return NULL; + + assert( s < dtblsize ); + c = &connections[s]; + + if( c != NULL ) { + ldap_pvt_thread_mutex_lock( &c->c_mutex ); + + assert( c->c_struct_state != SLAP_C_UNINITIALIZED ); + + if( c->c_struct_state != SLAP_C_USED ) { + /* connection must have been closed due to resched */ + + Debug( LDAP_DEBUG_CONNS, + "connection_get(%d): connection not used\n", + s, 0, 0 ); + assert( c->c_conn_state == SLAP_C_INVALID ); + assert( c->c_sd == AC_SOCKET_INVALID ); + + ldap_pvt_thread_mutex_unlock( &c->c_mutex ); + return NULL; + } + + Debug( LDAP_DEBUG_TRACE, + "connection_get(%d): got connid=%lu\n", + s, c->c_connid, 0 ); + + c->c_n_get++; + + assert( c->c_struct_state == SLAP_C_USED ); + assert( c->c_conn_state != SLAP_C_INVALID ); + assert( c->c_sd != AC_SOCKET_INVALID ); + +#ifndef SLAPD_MONITOR + if ( global_idletimeout > 0 ) +#endif /* ! SLAPD_MONITOR */ + { + c->c_activitytime = slap_get_time(); + } + } + + return c; +} + +static void connection_return( Connection *c ) +{ + ldap_pvt_thread_mutex_unlock( &c->c_mutex ); +} + +Connection * connection_init( + ber_socket_t s, + Listener *listener, + const char* dnsname, + const char* peername, + int flags, + slap_ssf_t ssf, + struct berval *authid + LDAP_PF_LOCAL_SENDMSG_ARG(struct berval *peerbv)) +{ + unsigned long id; + Connection *c; + int doinit = 0; + ber_socket_t sfd = SLAP_FD2SOCK(s); + + assert( connections != NULL ); + + assert( listener != NULL ); + assert( dnsname != NULL ); + assert( peername != NULL ); + +#ifndef HAVE_TLS + assert( !( flags & CONN_IS_TLS )); +#endif + + if( s == AC_SOCKET_INVALID ) { + Debug( LDAP_DEBUG_ANY, + "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 ); + return NULL; + } + + assert( s >= 0 ); + assert( s < dtblsize ); + c = &connections[s]; + if( c->c_struct_state == SLAP_C_UNINITIALIZED ) { + doinit = 1; + } else { + assert( c->c_struct_state == SLAP_C_UNUSED ); + } + + if( doinit ) { + c->c_send_ldap_result = slap_send_ldap_result; + c->c_send_search_entry = slap_send_search_entry; + c->c_send_search_reference = slap_send_search_reference; + c->c_send_ldap_extended = slap_send_ldap_extended; + c->c_send_ldap_intermediate = slap_send_ldap_intermediate; + + BER_BVZERO( &c->c_authmech ); + BER_BVZERO( &c->c_dn ); + BER_BVZERO( &c->c_ndn ); + + c->c_listener = NULL; + BER_BVZERO( &c->c_peer_domain ); + BER_BVZERO( &c->c_peer_name ); + + LDAP_STAILQ_INIT(&c->c_ops); + LDAP_STAILQ_INIT(&c->c_pending_ops); + +#ifdef LDAP_X_TXN + c->c_txn = CONN_TXN_INACTIVE; + c->c_txn_backend = NULL; + LDAP_STAILQ_INIT(&c->c_txn_ops); +#endif + + BER_BVZERO( &c->c_sasl_bind_mech ); + c->c_sasl_done = 0; + c->c_sasl_authctx = NULL; + c->c_sasl_sockctx = NULL; + c->c_sasl_extra = NULL; + c->c_sasl_bindop = NULL; + + c->c_sb = ber_sockbuf_alloc( ); + + { + ber_len_t max = sockbuf_max_incoming; + ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max ); + } + + c->c_currentber = NULL; + + /* should check status of thread calls */ + ldap_pvt_thread_mutex_init( &c->c_mutex ); + ldap_pvt_thread_mutex_init( &c->c_write1_mutex ); + ldap_pvt_thread_mutex_init( &c->c_write2_mutex ); + ldap_pvt_thread_cond_init( &c->c_write1_cv ); + ldap_pvt_thread_cond_init( &c->c_write2_cv ); + +#ifdef LDAP_SLAPI + if ( slapi_plugins_used ) { + slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c ); + } +#endif + } + + ldap_pvt_thread_mutex_lock( &c->c_mutex ); + + assert( BER_BVISNULL( &c->c_authmech ) ); + assert( BER_BVISNULL( &c->c_dn ) ); + assert( BER_BVISNULL( &c->c_ndn ) ); + assert( c->c_listener == NULL ); + assert( BER_BVISNULL( &c->c_peer_domain ) ); + assert( BER_BVISNULL( &c->c_peer_name ) ); + assert( LDAP_STAILQ_EMPTY(&c->c_ops) ); + assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) ); +#ifdef LDAP_X_TXN + assert( c->c_txn == CONN_TXN_INACTIVE ); + assert( c->c_txn_backend == NULL ); + assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) ); +#endif + assert( BER_BVISNULL( &c->c_sasl_bind_mech ) ); + assert( c->c_sasl_done == 0 ); + assert( c->c_sasl_authctx == NULL ); + assert( c->c_sasl_sockctx == NULL ); + assert( c->c_sasl_extra == NULL ); + assert( c->c_sasl_bindop == NULL ); + assert( c->c_currentber == NULL ); + assert( c->c_writewaiter == 0); + assert( c->c_writers == 0); + + c->c_listener = listener; + c->c_sd = s; + + if ( flags & CONN_IS_CLIENT ) { + c->c_connid = 0; + ldap_pvt_thread_mutex_lock( &connections_mutex ); + c->c_conn_state = SLAP_C_CLIENT; + c->c_struct_state = SLAP_C_USED; + ldap_pvt_thread_mutex_unlock( &connections_mutex ); + c->c_close_reason = "?"; /* should never be needed */ + ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &sfd ); + ldap_pvt_thread_mutex_unlock( &c->c_mutex ); + + return c; + } + + ber_str2bv( dnsname, 0, 1, &c->c_peer_domain ); + ber_str2bv( peername, 0, 1, &c->c_peer_name ); + + c->c_n_ops_received = 0; + c->c_n_ops_executing = 0; + c->c_n_ops_pending = 0; + c->c_n_ops_completed = 0; + + c->c_n_get = 0; + c->c_n_read = 0; + c->c_n_write = 0; + + /* set to zero until bind, implies LDAP_VERSION3 */ + c->c_protocol = 0; + +#ifndef SLAPD_MONITOR + if ( global_idletimeout > 0 ) +#endif /* ! SLAPD_MONITOR */ + { + c->c_activitytime = c->c_starttime = slap_get_time(); + } + +#ifdef LDAP_CONNECTIONLESS + c->c_is_udp = 0; + if( flags & CONN_IS_UDP ) { + c->c_is_udp = 1; +#ifdef LDAP_DEBUG + ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug, + LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" ); +#endif + ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp, + LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd ); + ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead, + LBER_SBIOD_LEVEL_PROVIDER, NULL ); + } else +#endif /* LDAP_CONNECTIONLESS */ +#ifdef LDAP_PF_LOCAL + if ( flags & CONN_IS_IPC ) { +#ifdef LDAP_DEBUG + ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug, + LBER_SBIOD_LEVEL_PROVIDER, (void*)"ipc_" ); +#endif + ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_fd, + LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd ); +#ifdef LDAP_PF_LOCAL_SENDMSG + if ( !BER_BVISEMPTY( peerbv )) + ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_UNGET_BUF, peerbv ); +#endif + } else +#endif /* LDAP_PF_LOCAL */ + { +#ifdef LDAP_DEBUG + ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug, + LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" ); +#endif + ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp, + LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd ); + } + +#ifdef LDAP_DEBUG + ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug, + INT_MAX, (void*)"ldap_" ); +#endif + + if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK, + c /* non-NULL */ ) < 0 ) + { + Debug( LDAP_DEBUG_ANY, + "connection_init(%d, %s): set nonblocking failed\n", + s, c->c_peer_name.bv_val, 0 ); + + c->c_listener = NULL; + if(c->c_peer_domain.bv_val != NULL) { + free(c->c_peer_domain.bv_val); + } + BER_BVZERO( &c->c_peer_domain ); + if(c->c_peer_name.bv_val != NULL) { + free(c->c_peer_name.bv_val); + } + BER_BVZERO( &c->c_peer_name ); + + ber_sockbuf_free( c->c_sb ); + c->c_sb = NULL; + c->c_sd = AC_SOCKET_INVALID; + ldap_pvt_thread_mutex_unlock( &c->c_mutex ); + + return NULL; + } + + ldap_pvt_thread_mutex_lock( &conn_nextid_mutex ); + id = c->c_connid = conn_nextid++; + ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex ); + + ldap_pvt_thread_mutex_lock( &connections_mutex ); + c->c_conn_state = SLAP_C_INACTIVE; + c->c_struct_state = SLAP_C_USED; + ldap_pvt_thread_mutex_unlock( &connections_mutex ); + c->c_close_reason = "?"; /* should never be needed */ + + c->c_ssf = c->c_transport_ssf = ssf; + c->c_tls_ssf = c->c_sasl_ssf = 0; + +#ifdef HAVE_TLS + if ( flags & CONN_IS_TLS ) { + c->c_is_tls = 1; + c->c_needs_tls_accept = 1; + } else { + c->c_is_tls = 0; + c->c_needs_tls_accept = 0; + } +#endif + + slap_sasl_open( c, 0 ); + slap_sasl_external( c, ssf, authid ); + + slapd_add_internal( s, 1 ); + + backend_connection_init(c); + ldap_pvt_thread_mutex_unlock( &c->c_mutex ); + + if ( !(flags & CONN_IS_UDP )) + Statslog( LDAP_DEBUG_STATS, + "conn=%ld fd=%ld ACCEPT from %s (%s)\n", + id, (long) s, peername, listener->sl_name.bv_val, 0 ); + + return c; +} + +void connection2anonymous( Connection *c ) +{ + assert( connections != NULL ); + assert( c != NULL ); + + { + ber_len_t max = sockbuf_max_incoming; + ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max ); + } + + if ( !BER_BVISNULL( &c->c_authmech ) ) { + ch_free(c->c_authmech.bv_val); + } + BER_BVZERO( &c->c_authmech ); + + if ( !BER_BVISNULL( &c->c_dn ) ) { + ch_free(c->c_dn.bv_val); + } + BER_BVZERO( &c->c_dn ); + + if ( !BER_BVISNULL( &c->c_ndn ) ) { + ch_free(c->c_ndn.bv_val); + } + BER_BVZERO( &c->c_ndn ); + + if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) { + ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL ); + } + BER_BVZERO( &c->c_sasl_authz_dn ); + + c->c_authz_backend = NULL; +} + +static void +connection_destroy( Connection *c ) +{ + unsigned long connid; + const char *close_reason; + Sockbuf *sb; + ber_socket_t sd; + + assert( connections != NULL ); + assert( c != NULL ); + assert( c->c_struct_state != SLAP_C_UNUSED ); + assert( c->c_conn_state != SLAP_C_INVALID ); + assert( LDAP_STAILQ_EMPTY(&c->c_ops) ); + assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) ); +#ifdef LDAP_X_TXN + assert( c->c_txn == CONN_TXN_INACTIVE ); + assert( c->c_txn_backend == NULL ); + assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) ); +#endif + assert( c->c_writewaiter == 0); + assert( c->c_writers == 0); + + /* only for stats (print -1 as "%lu" may give unexpected results ;) */ + connid = c->c_connid; + close_reason = c->c_close_reason; + + ldap_pvt_thread_mutex_lock( &connections_mutex ); + c->c_struct_state = SLAP_C_PENDING; + ldap_pvt_thread_mutex_unlock( &connections_mutex ); + + backend_connection_destroy(c); + + c->c_protocol = 0; + c->c_connid = -1; + + c->c_activitytime = c->c_starttime = 0; + + connection2anonymous( c ); + c->c_listener = NULL; + + if(c->c_peer_domain.bv_val != NULL) { + free(c->c_peer_domain.bv_val); + } + BER_BVZERO( &c->c_peer_domain ); + if(c->c_peer_name.bv_val != NULL) { + free(c->c_peer_name.bv_val); + } + BER_BVZERO( &c->c_peer_name ); + + c->c_sasl_bind_in_progress = 0; + if(c->c_sasl_bind_mech.bv_val != NULL) { + free(c->c_sasl_bind_mech.bv_val); + } + BER_BVZERO( &c->c_sasl_bind_mech ); + + slap_sasl_close( c ); + + if ( c->c_currentber != NULL ) { + ber_free( c->c_currentber, 1 ); + c->c_currentber = NULL; + } + + +#ifdef LDAP_SLAPI + /* call destructors, then constructors; avoids unnecessary allocation */ + if ( slapi_plugins_used ) { + slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c ); + } +#endif + + sd = c->c_sd; + c->c_sd = AC_SOCKET_INVALID; + c->c_conn_state = SLAP_C_INVALID; + c->c_struct_state = SLAP_C_UNUSED; + c->c_close_reason = "?"; /* should never be needed */ + + sb = c->c_sb; + c->c_sb = ber_sockbuf_alloc( ); + { + ber_len_t max = sockbuf_max_incoming; + ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max ); + } + + /* c must be fully reset by this point; when we call slapd_remove + * it may get immediately reused by a new connection. + */ + if ( sd != AC_SOCKET_INVALID ) { + slapd_remove( sd, sb, 1, 0, 0 ); + + if ( close_reason == NULL ) { + Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n", + connid, (long) sd, 0, 0, 0 ); + } else { + Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n", + connid, (long) sd, close_reason, 0, 0 ); + } + } +} + +int connection_valid( Connection *c ) +{ + /* c_mutex must be locked by caller */ + + assert( c != NULL ); + + return c->c_struct_state == SLAP_C_USED && + c->c_conn_state >= SLAP_C_ACTIVE && + c->c_conn_state <= SLAP_C_CLIENT; +} + +static void connection_abandon( Connection *c ) +{ + /* c_mutex must be locked by caller */ + + Operation *o, *next, op = {0}; + Opheader ohdr = {0}; + + op.o_hdr = &ohdr; + op.o_conn = c; + op.o_connid = c->c_connid; + op.o_tag = LDAP_REQ_ABANDON; + + for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) { + SlapReply rs = {REP_RESULT}; + + next = LDAP_STAILQ_NEXT( o, o_next ); + /* don't abandon an op twice */ + if ( o->o_abandon ) + continue; + op.orn_msgid = o->o_msgid; + o->o_abandon = 1; + op.o_bd = frontendDB; + frontendDB->be_abandon( &op, &rs ); + } + +#ifdef LDAP_X_TXN + /* remove operations in pending transaction */ + while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) { + LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next ); + LDAP_STAILQ_NEXT(o, o_next) = NULL; + slap_op_free( o, NULL ); + } + + /* clear transaction */ + c->c_txn_backend = NULL; + c->c_txn = CONN_TXN_INACTIVE; +#endif + + /* remove pending operations */ + while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) { + LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next ); + LDAP_STAILQ_NEXT(o, o_next) = NULL; + slap_op_free( o, NULL ); + } +} + +static void +connection_wake_writers( Connection *c ) +{ + /* wake write blocked operations */ + ldap_pvt_thread_mutex_lock( &c->c_write1_mutex ); + if ( c->c_writers > 0 ) { + c->c_writers = -c->c_writers; + ldap_pvt_thread_cond_broadcast( &c->c_write1_cv ); + ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex ); + if ( c->c_writewaiter ) { + ldap_pvt_thread_mutex_lock( &c->c_write2_mutex ); + ldap_pvt_thread_cond_signal( &c->c_write2_cv ); + slapd_clr_write( c->c_sd, 1 ); + ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex ); + } + ldap_pvt_thread_mutex_lock( &c->c_write1_mutex ); + while ( c->c_writers ) { + ldap_pvt_thread_cond_wait( &c->c_write1_cv, &c->c_write1_mutex ); + } + ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex ); + } else { + ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex ); + slapd_clr_write( c->c_sd, 1 ); + } +} + +void connection_closing( Connection *c, const char *why ) +{ + assert( connections != NULL ); + assert( c != NULL ); + + if ( c->c_struct_state != SLAP_C_USED ) return; + + assert( c->c_conn_state != SLAP_C_INVALID ); + + /* c_mutex must be locked by caller */ + + if( c->c_conn_state != SLAP_C_CLOSING ) { + Debug( LDAP_DEBUG_CONNS, + "connection_closing: readying conn=%lu sd=%d for close\n", + c->c_connid, c->c_sd, 0 ); + /* update state to closing */ + c->c_conn_state = SLAP_C_CLOSING; + c->c_close_reason = why; + + /* don't listen on this port anymore */ + slapd_clr_read( c->c_sd, 0 ); + + /* abandon active operations */ + connection_abandon( c ); + + /* wake write blocked operations */ + connection_wake_writers( c ); + + } else if( why == NULL && c->c_close_reason == conn_lost_str ) { + /* Client closed connection after doing Unbind. */ + c->c_close_reason = NULL; + } +} + +static void +connection_close( Connection *c ) +{ + assert( connections != NULL ); + assert( c != NULL ); + + if ( c->c_struct_state != SLAP_C_USED ) return; + + assert( c->c_conn_state == SLAP_C_CLOSING ); + + /* NOTE: c_mutex should be locked by caller */ + + if ( !LDAP_STAILQ_EMPTY(&c->c_ops) || + !LDAP_STAILQ_EMPTY(&c->c_pending_ops) ) + { + Debug( LDAP_DEBUG_CONNS, + "connection_close: deferring conn=%lu sd=%d\n", + c->c_connid, c->c_sd, 0 ); + return; + } + + Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n", + c->c_connid, c->c_sd, 0 ); + + connection_destroy( c ); +} + +unsigned long connections_nextid(void) +{ + unsigned long id; + assert( connections != NULL ); + + ldap_pvt_thread_mutex_lock( &conn_nextid_mutex ); + + id = conn_nextid; + + ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex ); + + return id; +} + +/* + * Loop through the connections: + * + * for (c = connection_first(&i); c; c = connection_next(c, &i)) ...; + * connection_done(c); + * + * 'i' is the cursor, initialized by connection_first(). + * 'c_mutex' is locked in the returned connection. The functions must + * be passed the previous return value so they can unlock it again. + */ + +Connection* connection_first( ber_socket_t *index ) +{ + assert( connections != NULL ); + assert( index != NULL ); + + ldap_pvt_thread_mutex_lock( &connections_mutex ); + for( *index = 0; *index < dtblsize; (*index)++) { + if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) { + break; + } + } + ldap_pvt_thread_mutex_unlock( &connections_mutex ); + + return connection_next(NULL, index); +} + +/* Next connection in loop, see connection_first() */ +Connection* connection_next( Connection *c, ber_socket_t *index ) +{ + assert( connections != NULL ); + assert( index != NULL ); + assert( *index <= dtblsize ); + + if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex ); + + c = NULL; + + ldap_pvt_thread_mutex_lock( &connections_mutex ); + for(; *index < dtblsize; (*index)++) { + int c_struct; + if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) { + /* FIXME: accessing c_conn_state without locking c_mutex */ + assert( connections[*index].c_conn_state == SLAP_C_INVALID ); + continue; + } + + if( connections[*index].c_struct_state == SLAP_C_USED ) { + c = &connections[(*index)++]; + if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) { + /* avoid deadlock */ + ldap_pvt_thread_mutex_unlock( &connections_mutex ); + ldap_pvt_thread_mutex_lock( &c->c_mutex ); + ldap_pvt_thread_mutex_lock( &connections_mutex ); + if ( c->c_struct_state != SLAP_C_USED ) { + ldap_pvt_thread_mutex_unlock( &c->c_mutex ); + c = NULL; + continue; + } + } + assert( c->c_conn_state != SLAP_C_INVALID ); + break; + } + + c_struct = connections[*index].c_struct_state; + if ( c_struct == SLAP_C_PENDING ) + continue; + assert( c_struct == SLAP_C_UNUSED ); + /* FIXME: accessing c_conn_state without locking c_mutex */ + assert( connections[*index].c_conn_state == SLAP_C_INVALID ); + } + + ldap_pvt_thread_mutex_unlock( &connections_mutex ); + return c; +} + +/* End connection loop, see connection_first() */ +void connection_done( Connection *c ) +{ + assert( connections != NULL ); + + if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex ); +} + +/* + * connection_activity - handle the request operation op on connection + * conn. This routine figures out what kind of operation it is and + * calls the appropriate stub to handle it. + */ + +#ifdef SLAPD_MONITOR +/* FIXME: returns 0 in case of failure */ +#define INCR_OP_INITIATED(index) \ + do { \ + ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \ + ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated_[(index)], 1); \ + ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \ + } while (0) +#define INCR_OP_COMPLETED(index) \ + do { \ + ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \ + ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \ + ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed_[(index)], 1); \ + ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \ + } while (0) +#else /* !SLAPD_MONITOR */ +#define INCR_OP_INITIATED(index) do { } while (0) +#define INCR_OP_COMPLETED(index) \ + do { \ + ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \ + ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \ + ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \ + } while (0) +#endif /* !SLAPD_MONITOR */ + +/* + * NOTE: keep in sync with enum in slapd.h + */ +static BI_op_func *opfun[] = { + do_bind, + do_unbind, + do_search, + do_compare, + do_modify, + do_modrdn, + do_add, + do_delete, + do_abandon, + do_extended, + NULL +}; + +/* Counters are per-thread, not per-connection. + */ +static void +conn_counter_destroy( void *key, void *data ) +{ + slap_counters_t **prev, *sc; + + ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex ); + for ( prev = &slap_counters.sc_next, sc = slap_counters.sc_next; sc; + prev = &sc->sc_next, sc = sc->sc_next ) { + if ( sc == data ) { + int i; + + *prev = sc->sc_next; + /* Copy data to main counter */ + ldap_pvt_mp_add( slap_counters.sc_bytes, sc->sc_bytes ); + ldap_pvt_mp_add( slap_counters.sc_pdu, sc->sc_pdu ); + ldap_pvt_mp_add( slap_counters.sc_entries, sc->sc_entries ); + ldap_pvt_mp_add( slap_counters.sc_refs, sc->sc_refs ); + ldap_pvt_mp_add( slap_counters.sc_ops_initiated, sc->sc_ops_initiated ); + ldap_pvt_mp_add( slap_counters.sc_ops_completed, sc->sc_ops_completed ); +#ifdef SLAPD_MONITOR + for ( i = 0; i < SLAP_OP_LAST; i++ ) { + ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_initiated_[ i ] ); + ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_completed_[ i ] ); + } +#endif /* SLAPD_MONITOR */ + slap_counters_destroy( sc ); + ber_memfree_x( data, NULL ); + break; + } + } + ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex ); +} + +static void +conn_counter_init( Operation *op, void *ctx ) +{ + slap_counters_t *sc; + void *vsc = NULL; + + if ( ldap_pvt_thread_pool_getkey( + ctx, (void *)conn_counter_init, &vsc, NULL ) || !vsc ) { + vsc = ch_malloc( sizeof( slap_counters_t )); + sc = vsc; + slap_counters_init( sc ); + ldap_pvt_thread_pool_setkey( ctx, (void*)conn_counter_init, vsc, + conn_counter_destroy, NULL, NULL ); + + ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex ); + sc->sc_next = slap_counters.sc_next; + slap_counters.sc_next = sc; + ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex ); + } + op->o_counters = vsc; +} + +static void * +connection_operation( void *ctx, void *arg_v ) +{ + int rc = LDAP_OTHER, cancel; + Operation *op = arg_v; + SlapReply rs = {REP_RESULT}; + ber_tag_t tag = op->o_tag; + slap_op_t opidx = SLAP_OP_LAST; + Connection *conn = op->o_conn; + void *memctx = NULL; + void *memctx_null = NULL; + ber_len_t memsiz; + + conn_counter_init( op, ctx ); + ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); + /* FIXME: returns 0 in case of failure */ + ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated, 1); + ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); + + op->o_threadctx = ctx; + op->o_tid = ldap_pvt_thread_pool_tid( ctx ); + + switch ( tag ) { + case LDAP_REQ_BIND: + case LDAP_REQ_UNBIND: + case LDAP_REQ_ADD: + case LDAP_REQ_DELETE: + case LDAP_REQ_MODDN: + case LDAP_REQ_MODIFY: + case LDAP_REQ_COMPARE: + case LDAP_REQ_SEARCH: + case LDAP_REQ_ABANDON: + case LDAP_REQ_EXTENDED: + break; + default: + Debug( LDAP_DEBUG_ANY, "connection_operation: " + "conn %lu unknown LDAP request 0x%lx\n", + conn->c_connid, tag, 0 ); + op->o_tag = LBER_ERROR; + rs.sr_err = LDAP_PROTOCOL_ERROR; + rs.sr_text = "unknown LDAP request"; + send_ldap_disconnect( op, &rs ); + rc = SLAPD_DISCONNECT; + goto operations_error; + } + + if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) { + Debug( LDAP_DEBUG_ANY, "connection_operation: " + "error: SASL bind in progress (tag=%ld).\n", + (long) tag, 0, 0 ); + send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR, + "SASL bind in progress" ); + rc = LDAP_OPERATIONS_ERROR; + goto operations_error; + } + +#ifdef LDAP_X_TXN + if (( conn->c_txn == CONN_TXN_SPECIFY ) && ( + ( tag == LDAP_REQ_ADD ) || + ( tag == LDAP_REQ_DELETE ) || + ( tag == LDAP_REQ_MODIFY ) || + ( tag == LDAP_REQ_MODRDN ))) + { + /* Disable SLAB allocator for all update operations + issued inside of a transaction */ + op->o_tmpmemctx = NULL; + op->o_tmpmfuncs = &ch_mfuncs; + } else +#endif + { + /* We can use Thread-Local storage for most mallocs. We can + * also use TL for ber parsing, but not on Add or Modify. + */ +#if 0 + memsiz = ber_len( op->o_ber ) * 64; + if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE; +#endif + memsiz = SLAP_SLAB_SIZE; + + memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx, 1 ); + op->o_tmpmemctx = memctx; + op->o_tmpmfuncs = &slap_sl_mfuncs; + if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) { + /* Note - the ber and its buffer are already allocated from + * regular memory; this only affects subsequent mallocs that + * ber_scanf may invoke. + */ + ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx ); + } + } + + opidx = slap_req2op( tag ); + assert( opidx != SLAP_OP_LAST ); + INCR_OP_INITIATED( opidx ); + rc = (*(opfun[opidx]))( op, &rs ); + +operations_error: + if ( rc == SLAPD_DISCONNECT ) { + tag = LBER_ERROR; + + } else if ( opidx != SLAP_OP_LAST ) { + /* increment completed operations count + * only if operation was initiated + * and rc != SLAPD_DISCONNECT */ + INCR_OP_COMPLETED( opidx ); + } + + ldap_pvt_thread_mutex_lock( &conn->c_mutex ); + + if ( opidx == SLAP_OP_BIND && conn->c_conn_state == SLAP_C_BINDING ) + conn->c_conn_state = SLAP_C_ACTIVE; + + cancel = op->o_cancel; + if ( cancel != SLAP_CANCEL_NONE && cancel != SLAP_CANCEL_DONE ) { + if ( cancel == SLAP_CANCEL_REQ ) { + op->o_cancel = rc == SLAPD_ABANDON + ? SLAP_CANCEL_ACK : LDAP_TOO_LATE; + } + + do { + /* Fake a cond_wait with thread_yield, then + * verify the result properly mutex-protected. + */ + ldap_pvt_thread_mutex_unlock( &conn->c_mutex ); + do { + ldap_pvt_thread_yield(); + } while ( (cancel = op->o_cancel) != SLAP_CANCEL_NONE + && cancel != SLAP_CANCEL_DONE ); + ldap_pvt_thread_mutex_lock( &conn->c_mutex ); + } while ( (cancel = op->o_cancel) != SLAP_CANCEL_NONE + && cancel != SLAP_CANCEL_DONE ); + } + + ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null ); + + LDAP_STAILQ_REMOVE( &conn->c_ops, op, Operation, o_next); + LDAP_STAILQ_NEXT(op, o_next) = NULL; + conn->c_n_ops_executing--; + conn->c_n_ops_completed++; + + switch( tag ) { + case LBER_ERROR: + case LDAP_REQ_UNBIND: + /* c_mutex is locked */ + connection_closing( conn, + tag == LDAP_REQ_UNBIND ? NULL : "operations error" ); + break; + } + + connection_resched( conn ); + ldap_pvt_thread_mutex_unlock( &conn->c_mutex ); + slap_op_free( op, ctx ); + return NULL; +} + +static const Listener dummy_list = { BER_BVC(""), BER_BVC("") }; + +Connection *connection_client_setup( + ber_socket_t s, + ldap_pvt_thread_start_t *func, + void *arg ) +{ + Connection *c; + ber_socket_t sfd = SLAP_SOCKNEW( s ); + + c = connection_init( sfd, (Listener *)&dummy_list, "", "", + CONN_IS_CLIENT, 0, NULL + LDAP_PF_LOCAL_SENDMSG_ARG(NULL)); + if ( c ) { + c->c_clientfunc = func; + c->c_clientarg = arg; + + slapd_add_internal( sfd, 0 ); + } + return c; +} + +void connection_client_enable( + Connection *c ) +{ + slapd_set_read( c->c_sd, 1 ); +} + +void connection_client_stop( + Connection *c ) +{ + Sockbuf *sb; + ber_socket_t s = c->c_sd; + + /* get (locked) connection */ + c = connection_get( s ); + + assert( c->c_conn_state == SLAP_C_CLIENT ); + + c->c_listener = NULL; + c->c_conn_state = SLAP_C_INVALID; + c->c_struct_state = SLAP_C_UNUSED; + c->c_sd = AC_SOCKET_INVALID; + c->c_close_reason = "?"; /* should never be needed */ + sb = c->c_sb; + c->c_sb = ber_sockbuf_alloc( ); + { + ber_len_t max = sockbuf_max_incoming; + ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max ); + } + slapd_remove( s, sb, 0, 1, 0 ); + + connection_return( c ); +} + +static int connection_read( ber_socket_t s, conn_readinfo *cri ); + +static void* connection_read_thread( void* ctx, void* argv ) +{ + int rc ; + conn_readinfo cri = { NULL, NULL, NULL, NULL, 0 }; + ber_socket_t s = (long)argv; + + /* + * read incoming LDAP requests. If there is more than one, + * the first one is returned with new_op + */ + cri.ctx = ctx; + if( ( rc = connection_read( s, &cri ) ) < 0 ) { + Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 ); + return (void*)(long)rc; + } + + /* execute a single queued request in the same thread */ + if( cri.op && !cri.nullop ) { + rc = (long)connection_operation( ctx, cri.op ); + } else if ( cri.func ) { + rc = (long)cri.func( ctx, cri.arg ); + } + + return (void*)(long)rc; +} + +int connection_read_activate( ber_socket_t s ) +{ + int rc; + + /* + * suspend reading on this file descriptor until a connection processing + * thread reads data on it. Otherwise the listener thread will repeatedly + * submit the same event on it to the pool. + */ + rc = slapd_clr_read( s, 0 ); + if ( rc ) + return rc; + + /* Don't let blocked writers block a pause request */ + if ( connections[s].c_writewaiter && + ldap_pvt_thread_pool_pausing( &connection_pool )) + connection_wake_writers( &connections[s] ); + + rc = ldap_pvt_thread_pool_submit( &connection_pool, + connection_read_thread, (void *)(long)s ); + + if( rc != 0 ) { + Debug( LDAP_DEBUG_ANY, + "connection_read_activate(%d): submit failed (%d)\n", + s, rc, 0 ); + } + + return rc; +} + +static int +connection_read( ber_socket_t s, conn_readinfo *cri ) +{ + int rc = 0; + Connection *c; + + assert( connections != NULL ); + + /* get (locked) connection */ + c = connection_get( s ); + + if( c == NULL ) { + Debug( LDAP_DEBUG_ANY, + "connection_read(%ld): no connection!\n", + (long) s, 0, 0 ); + + return -1; + } + + c->c_n_read++; + + if( c->c_conn_state == SLAP_C_CLOSING ) { + Debug( LDAP_DEBUG_CONNS, + "connection_read(%d): closing, ignoring input for id=%lu\n", + s, c->c_connid, 0 ); + connection_return( c ); + return 0; + } + + if ( c->c_conn_state == SLAP_C_CLIENT ) { + cri->func = c->c_clientfunc; + cri->arg = c->c_clientarg; + /* read should already be cleared */ + connection_return( c ); + return 0; + } + + Debug( LDAP_DEBUG_TRACE, + "connection_read(%d): checking for input on id=%lu\n", + s, c->c_connid, 0 ); + +#ifdef HAVE_TLS + if ( c->c_is_tls && c->c_needs_tls_accept ) { + rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx ); + if ( rc < 0 ) { + Debug( LDAP_DEBUG_TRACE, + "connection_read(%d): TLS accept failure " + "error=%d id=%lu, closing\n", + s, rc, c->c_connid ); + + c->c_needs_tls_accept = 0; + /* c_mutex is locked */ + connection_closing( c, "TLS negotiation failure" ); + connection_close( c ); + connection_return( c ); + return 0; + + } else if ( rc == 0 ) { + void *ssl; + struct berval authid = BER_BVNULL; + + c->c_needs_tls_accept = 0; + + /* we need to let SASL know */ + ssl = ldap_pvt_tls_sb_ctx( c->c_sb ); + + c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl ); + if( c->c_tls_ssf > c->c_ssf ) { + c->c_ssf = c->c_tls_ssf; + } + + rc = dnX509peerNormalize( ssl, &authid ); + if ( rc != LDAP_SUCCESS ) { + Debug( LDAP_DEBUG_TRACE, "connection_read(%d): " + "unable to get TLS client DN, error=%d id=%lu\n", + s, rc, c->c_connid ); + } + Statslog( LDAP_DEBUG_STATS, + "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n", + c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 ); + slap_sasl_external( c, c->c_tls_ssf, &authid ); + if ( authid.bv_val ) free( authid.bv_val ); + } else if ( rc == 1 && ber_sockbuf_ctrl( c->c_sb, + LBER_SB_OPT_NEEDS_WRITE, NULL )) { /* need to retry */ + slapd_set_write( s, 1 ); + connection_return( c ); + return 0; + } + + /* if success and data is ready, fall thru to data input loop */ + if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) ) + { + slapd_set_read( s, 1 ); + connection_return( c ); + return 0; + } + } +#endif + +#ifdef HAVE_CYRUS_SASL + if ( c->c_sasl_layers ) { + /* If previous layer is not removed yet, give up for now */ + if ( !c->c_sasl_sockctx ) { + slapd_set_read( s, 1 ); + connection_return( c ); + return 0; + } + + c->c_sasl_layers = 0; + + rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx ); + if( rc != LDAP_SUCCESS ) { + Debug( LDAP_DEBUG_TRACE, + "connection_read(%d): SASL install error " + "error=%d id=%lu, closing\n", + s, rc, c->c_connid ); + + /* c_mutex is locked */ + connection_closing( c, "SASL layer install failure" ); + connection_close( c ); + connection_return( c ); + return 0; + } + } +#endif + +#define CONNECTION_INPUT_LOOP 1 +/* #define DATA_READY_LOOP 1 */ + + do { + /* How do we do this without getting into a busy loop ? */ + rc = connection_input( c, cri ); + } +#ifdef DATA_READY_LOOP + while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL )); +#elif defined CONNECTION_INPUT_LOOP + while(!rc); +#else + while(0); +#endif + + if( rc < 0 ) { + Debug( LDAP_DEBUG_CONNS, + "connection_read(%d): input error=%d id=%lu, closing.\n", + s, rc, c->c_connid ); + + /* c_mutex is locked */ + connection_closing( c, conn_lost_str ); + connection_close( c ); + connection_return( c ); + return 0; + } + + if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) { + slapd_set_write( s, 0 ); + } + + slapd_set_read( s, 1 ); + connection_return( c ); + + return 0; +} + +static int +connection_input( Connection *conn , conn_readinfo *cri ) +{ + Operation *op; + ber_tag_t tag; + ber_len_t len; + ber_int_t msgid; + BerElement *ber; + int rc; +#ifdef LDAP_CONNECTIONLESS + Sockaddr peeraddr; + char *cdn = NULL; +#endif + char *defer = NULL; + void *ctx; + + if ( conn->c_currentber == NULL && + ( conn->c_currentber = ber_alloc()) == NULL ) + { + Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 ); + return -1; + } + + sock_errset(0); + +#ifdef LDAP_CONNECTIONLESS + if ( conn->c_is_udp ) { +#if defined(LDAP_PF_INET6) + char peername[sizeof("IP=[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]:65535")]; + char addr[INET6_ADDRSTRLEN]; +#else + char peername[sizeof("IP=255.255.255.255:65336")]; + char addr[INET_ADDRSTRLEN]; +#endif + const char *peeraddr_string = NULL; + + len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(Sockaddr)); + if (len != sizeof(Sockaddr)) return 1; + +#if defined(LDAP_PF_INET6) + if (peeraddr.sa_addr.sa_family == AF_INET6) { + if ( IN6_IS_ADDR_V4MAPPED(&peeraddr.sa_in6_addr.sin6_addr) ) { +#if defined( HAVE_GETADDRINFO ) && defined( HAVE_INET_NTOP ) + peeraddr_string = inet_ntop( AF_INET, + ((struct in_addr *)&peeraddr.sa_in6_addr.sin6_addr.s6_addr[12]), + addr, sizeof(addr) ); +#else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */ + peeraddr_string = inet_ntoa( *((struct in_addr *) + &peeraddr.sa_in6_addr.sin6_addr.s6_addr[12]) ); +#endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */ + if ( !peeraddr_string ) peeraddr_string = SLAP_STRING_UNKNOWN; + sprintf( peername, "IP=%s:%d", peeraddr_string, + (unsigned) ntohs( peeraddr.sa_in6_addr.sin6_port ) ); + } else { + peeraddr_string = inet_ntop( AF_INET6, + &peeraddr.sa_in6_addr.sin6_addr, + addr, sizeof addr ); + if ( !peeraddr_string ) peeraddr_string = SLAP_STRING_UNKNOWN; + sprintf( peername, "IP=[%s]:%d", peeraddr_string, + (unsigned) ntohs( peeraddr.sa_in6_addr.sin6_port ) ); + } + } else +#endif +#if defined( HAVE_GETADDRINFO ) && defined( HAVE_INET_NTOP ) + { + peeraddr_string = inet_ntop( AF_INET, &peeraddr.sa_in_addr.sin_addr, + addr, sizeof(addr) ); +#else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */ + peeraddr_string = inet_ntoa( peeraddr.sa_in_addr.sin_addr ); +#endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */ + sprintf( peername, "IP=%s:%d", + peeraddr_string, + (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) ); + } + Statslog( LDAP_DEBUG_STATS, + "conn=%lu UDP request from %s (%s) accepted.\n", + conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 ); + } +#endif + + tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ); + if ( tag != LDAP_TAG_MESSAGE ) { + int err = sock_errno(); + + if ( err != EWOULDBLOCK && err != EAGAIN ) { + /* log, close and send error */ + Debug( LDAP_DEBUG_TRACE, + "ber_get_next on fd %d failed errno=%d (%s)\n", + conn->c_sd, err, sock_errstr(err) ); + ber_free( conn->c_currentber, 1 ); + conn->c_currentber = NULL; + + return -2; + } + return 1; + } + + ber = conn->c_currentber; + conn->c_currentber = NULL; + + if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) { + /* log, close and send error */ + Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 ); + ber_free( ber, 1 ); + return -1; + } + + if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) { + /* log, close and send error */ + Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 ); + ber_free( ber, 1 ); + + return -1; + } + +#ifdef LDAP_CONNECTIONLESS + if( conn->c_is_udp ) { + if( tag == LBER_OCTETSTRING ) { + if ( (tag = ber_get_stringa( ber, &cdn )) != LBER_ERROR ) + tag = ber_peek_tag( ber, &len ); + } + if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) { + Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 ); + ber_free( ber, 1 ); + return 0; + } + } +#endif + + if(tag == LDAP_REQ_BIND) { + /* immediately abandon all existing operations upon BIND */ + connection_abandon( conn ); + } + + ctx = cri->ctx; + op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++, ctx ); + + Debug( LDAP_DEBUG_TRACE, "op tag 0x%lx, time %ld\n", tag, + (long) op->o_time, 0); + + op->o_conn = conn; + /* clear state if the connection is being reused from inactive */ + if ( conn->c_conn_state == SLAP_C_INACTIVE ) { + memset( &conn->c_pagedresults_state, 0, + sizeof( conn->c_pagedresults_state ) ); + } + + op->o_res_ber = NULL; + +#ifdef LDAP_CONNECTIONLESS + if (conn->c_is_udp) { + if ( cdn ) { + ber_str2bv( cdn, 0, 1, &op->o_dn ); + op->o_protocol = LDAP_VERSION2; + } + op->o_res_ber = ber_alloc_t( LBER_USE_DER ); + if (op->o_res_ber == NULL) return 1; + + rc = ber_write( op->o_res_ber, (char *)&peeraddr, + sizeof(struct sockaddr), 0 ); + + if (rc != sizeof(struct sockaddr)) { + Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 ); + return 1; + } + + if (op->o_protocol == LDAP_VERSION2) { + rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, ""); + if (rc == -1) { + Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 ); + return rc; + } + } + } +#endif /* LDAP_CONNECTIONLESS */ + + rc = 0; + + /* Don't process requests when the conn is in the middle of a + * Bind, or if it's closing. Also, don't let any single conn + * use up all the available threads, and don't execute if we're + * currently blocked on output. And don't execute if there are + * already pending ops, let them go first. Abandon operations + * get exceptions to some, but not all, cases. + */ + switch( tag ){ + default: + /* Abandon and Unbind are exempt from these checks */ + if (conn->c_conn_state == SLAP_C_CLOSING) { + defer = "closing"; + break; + } else if (conn->c_writewaiter) { + defer = "awaiting write"; + break; + } else if (conn->c_n_ops_pending) { + defer = "pending operations"; + break; + } + /* FALLTHRU */ + case LDAP_REQ_ABANDON: + /* Unbind is exempt from these checks */ + if (conn->c_n_ops_executing >= connection_pool_max/2) { + defer = "too many executing"; + break; + } else if (conn->c_conn_state == SLAP_C_BINDING) { + defer = "binding"; + break; + } + /* FALLTHRU */ + case LDAP_REQ_UNBIND: + break; + } + + if( defer ) { + int max = conn->c_dn.bv_len + ? slap_conn_max_pending_auth + : slap_conn_max_pending; + + Debug( LDAP_DEBUG_ANY, + "connection_input: conn=%lu deferring operation: %s\n", + conn->c_connid, defer, 0 ); + conn->c_n_ops_pending++; + LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next ); + rc = ( conn->c_n_ops_pending > max ) ? -1 : 0; + + } else { + conn->c_n_ops_executing++; + + /* + * The first op will be processed in the same thread context, + * as long as there is only one op total. + * Subsequent ops will be submitted to the pool by + * calling connection_op_activate() + */ + if ( cri->op == NULL ) { + /* the first incoming request */ + connection_op_queue( op ); + cri->op = op; + } else { + if ( !cri->nullop ) { + cri->nullop = 1; + rc = ldap_pvt_thread_pool_submit( &connection_pool, + connection_operation, (void *) cri->op ); + } + connection_op_activate( op ); + } + } + +#ifdef NO_THREADS + if ( conn->c_struct_state != SLAP_C_USED ) { + /* connection must have got closed underneath us */ + return 1; + } +#endif + + assert( conn->c_struct_state == SLAP_C_USED ); + return rc; +} + +static int +connection_resched( Connection *conn ) +{ + Operation *op; + + if( conn->c_writewaiter ) + return 0; + + if( conn->c_conn_state == SLAP_C_CLOSING ) { + Debug( LDAP_DEBUG_CONNS, "connection_resched: " + "attempting closing conn=%lu sd=%d\n", + conn->c_connid, conn->c_sd, 0 ); + connection_close( conn ); + return 0; + } + + if( conn->c_conn_state != SLAP_C_ACTIVE ) { + /* other states need different handling */ + return 0; + } + + while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) { + if ( conn->c_n_ops_executing > connection_pool_max/2 ) break; + + LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next ); + LDAP_STAILQ_NEXT(op, o_next) = NULL; + + /* pending operations should not be marked for abandonment */ + assert(!op->o_abandon); + + conn->c_n_ops_pending--; + conn->c_n_ops_executing++; + + connection_op_activate( op ); + + if ( conn->c_conn_state == SLAP_C_BINDING ) break; + } + return 0; +} + +static void +connection_init_log_prefix( Operation *op ) +{ + if ( op->o_connid == (unsigned long)(-1) ) { + snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ), + "conn=-1 op=%lu", op->o_opid ); + + } else { + snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ), + "conn=%lu op=%lu", op->o_connid, op->o_opid ); + } +} + +static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs ) +{ + op->o_conn->c_sasl_bindop = NULL; + + ch_free( op->o_callback ); + op->o_callback = NULL; + + return SLAP_CB_CONTINUE; +} + +static int connection_bind_cb( Operation *op, SlapReply *rs ) +{ + ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex ); + op->o_conn->c_sasl_bind_in_progress = + ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS ); + + /* Moved here from bind.c due to ITS#4158 */ + op->o_conn->c_sasl_bindop = NULL; + if ( op->orb_method == LDAP_AUTH_SASL ) { + if( rs->sr_err == LDAP_SUCCESS ) { + ber_dupbv(&op->o_conn->c_dn, &op->orb_edn); + if( !BER_BVISEMPTY( &op->orb_edn ) ) { + /* edn is always normalized already */ + ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn ); + } + op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx ); + BER_BVZERO( &op->orb_edn ); + op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech; + BER_BVZERO( &op->o_conn->c_sasl_bind_mech ); + + op->o_conn->c_sasl_ssf = op->orb_ssf; + if( op->orb_ssf > op->o_conn->c_ssf ) { + op->o_conn->c_ssf = op->orb_ssf; + } + + if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) { + ber_len_t max = sockbuf_max_incoming_auth; + ber_sockbuf_ctrl( op->o_conn->c_sb, + LBER_SB_OPT_SET_MAX_INCOMING, &max ); + } + + /* log authorization identity */ + Statslog( LDAP_DEBUG_STATS, + "%s BIND dn=\"%s\" mech=%s sasl_ssf=%d ssf=%d\n", + op->o_log_prefix, + BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val, + op->o_conn->c_authmech.bv_val, + op->orb_ssf, op->o_conn->c_ssf ); + + Debug( LDAP_DEBUG_TRACE, + "do_bind: SASL/%s bind: dn=\"%s\" sasl_ssf=%d\n", + op->o_conn->c_authmech.bv_val, + BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val, + op->orb_ssf ); + + } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) { + if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) { + free( op->o_conn->c_sasl_bind_mech.bv_val ); + BER_BVZERO( &op->o_conn->c_sasl_bind_mech ); + } + } + } + ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex ); + + ch_free( op->o_callback ); + op->o_callback = NULL; + + return SLAP_CB_CONTINUE; +} + +static void connection_op_queue( Operation *op ) +{ + ber_tag_t tag = op->o_tag; + + if (tag == LDAP_REQ_BIND) { + slap_callback *sc = ch_calloc( 1, sizeof( slap_callback )); + sc->sc_response = connection_bind_cb; + sc->sc_cleanup = connection_bind_cleanup_cb; + sc->sc_next = op->o_callback; + op->o_callback = sc; + op->o_conn->c_conn_state = SLAP_C_BINDING; + } + + if (!op->o_dn.bv_len) { + op->o_authz = op->o_conn->c_authz; + if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) { + ber_dupbv( &op->o_dn, &op->o_conn->c_dn ); + ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn ); + } else { + ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn ); + ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn ); + } + } + + op->o_authtype = op->o_conn->c_authtype; + ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech ); + + if (!op->o_protocol) { + op->o_protocol = op->o_conn->c_protocol + ? op->o_conn->c_protocol : LDAP_VERSION3; + } + + if (op->o_conn->c_conn_state == SLAP_C_INACTIVE && + op->o_protocol > LDAP_VERSION2) + { + op->o_conn->c_conn_state = SLAP_C_ACTIVE; + } + + op->o_connid = op->o_conn->c_connid; + connection_init_log_prefix( op ); + + LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next ); +} + +static int connection_op_activate( Operation *op ) +{ + int rc; + + connection_op_queue( op ); + + rc = ldap_pvt_thread_pool_submit( &connection_pool, + connection_operation, (void *) op ); + + if ( rc != 0 ) { + Debug( LDAP_DEBUG_ANY, + "connection_op_activate: submit failed (%d) for conn=%lu\n", + rc, op->o_connid, 0 ); + /* should move op to pending list */ + } + + return rc; +} + +int connection_write(ber_socket_t s) +{ + Connection *c; + Operation *op; + + assert( connections != NULL ); + + c = connection_get( s ); + if( c == NULL ) { + Debug( LDAP_DEBUG_ANY, + "connection_write(%ld): no connection!\n", + (long)s, 0, 0 ); + return -1; + } + + slapd_clr_write( s, 0 ); + +#ifdef HAVE_TLS + if ( c->c_is_tls && c->c_needs_tls_accept ) { + connection_return( c ); + connection_read_activate( s ); + return 0; + } +#endif + + c->c_n_write++; + + Debug( LDAP_DEBUG_TRACE, + "connection_write(%d): waking output for id=%lu\n", + s, c->c_connid, 0 ); + ldap_pvt_thread_mutex_lock( &c->c_write2_mutex ); + ldap_pvt_thread_cond_signal( &c->c_write2_cv ); + ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex ); + + if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) { + slapd_set_read( s, 1 ); + } + if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) { + slapd_set_write( s, 1 ); + } + + /* If there are ops pending because of a writewaiter, + * start one up. + */ + while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) { + if ( !c->c_writewaiter ) break; + if ( c->c_n_ops_executing > connection_pool_max/2 ) break; + + LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next ); + LDAP_STAILQ_NEXT(op, o_next) = NULL; + + /* pending operations should not be marked for abandonment */ + assert(!op->o_abandon); + + c->c_n_ops_pending--; + c->c_n_ops_executing++; + + connection_op_activate( op ); + + break; + } + + connection_return( c ); + return 0; +} + +#ifdef LDAP_SLAPI +typedef struct conn_fake_extblock { + void *eb_conn; + void *eb_op; +} conn_fake_extblock; + +static void +connection_fake_destroy( + void *key, + void *data ) +{ + Connection conn = {0}; + Operation op = {0}; + Opheader ohdr = {0}; + + conn_fake_extblock *eb = data; + + op.o_hdr = &ohdr; + op.o_hdr->oh_extensions = eb->eb_op; + conn.c_extensions = eb->eb_conn; + op.o_conn = &conn; + conn.c_connid = -1; + op.o_connid = -1; + + ber_memfree_x( eb, NULL ); + slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, &op ); + slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &conn ); +} +#endif + +void +connection_fake_init( + Connection *conn, + OperationBuffer *opbuf, + void *ctx ) +{ + connection_fake_init2( conn, opbuf, ctx, 1 ); +} + +void +operation_fake_init( + Connection *conn, + Operation *op, + void *ctx, + int newmem ) +{ + /* set memory context */ + op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, + newmem ); + op->o_tmpmfuncs = &slap_sl_mfuncs; + op->o_threadctx = ctx; + op->o_tid = ldap_pvt_thread_pool_tid( ctx ); + + op->o_counters = &slap_counters; + op->o_conn = conn; + op->o_connid = op->o_conn->c_connid; + connection_init_log_prefix( op ); +} + + +void +connection_fake_init2( + Connection *conn, + OperationBuffer *opbuf, + void *ctx, + int newmem ) +{ + Operation *op = (Operation *) opbuf; + + conn->c_connid = -1; + conn->c_conn_idx = -1; + conn->c_send_ldap_result = slap_send_ldap_result; + conn->c_send_search_entry = slap_send_search_entry; + conn->c_send_search_reference = slap_send_search_reference; + conn->c_send_ldap_extended = slap_send_ldap_extended; + conn->c_send_ldap_intermediate = slap_send_ldap_intermediate; + conn->c_listener = (Listener *)&dummy_list; + conn->c_peer_domain = slap_empty_bv; + conn->c_peer_name = slap_empty_bv; + + memset( opbuf, 0, sizeof( *opbuf )); + op->o_hdr = &opbuf->ob_hdr; + op->o_controls = opbuf->ob_controls; + + operation_fake_init( conn, op, ctx, newmem ); + +#ifdef LDAP_SLAPI + if ( slapi_plugins_used ) { + conn_fake_extblock *eb; + void *ebx = NULL; + + /* Use thread keys to make sure these eventually get cleaned up */ + if ( ldap_pvt_thread_pool_getkey( ctx, (void *)connection_fake_init, + &ebx, NULL )) { + eb = ch_malloc( sizeof( *eb )); + slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn ); + slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op ); + eb->eb_conn = conn->c_extensions; + eb->eb_op = op->o_hdr->oh_extensions; + ldap_pvt_thread_pool_setkey( ctx, (void *)connection_fake_init, + eb, connection_fake_destroy, NULL, NULL ); + } else { + eb = ebx; + conn->c_extensions = eb->eb_conn; + op->o_hdr->oh_extensions = eb->eb_op; + } + } +#endif /* LDAP_SLAPI */ + + slap_op_time( &op->o_time, &op->o_tincr ); +} + +void +connection_assign_nextid( Connection *conn ) +{ + ldap_pvt_thread_mutex_lock( &conn_nextid_mutex ); + conn->c_connid = conn_nextid++; + ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex ); +} |