git.sur5r.net Git - openldap/blob - servers/slapd/connection.c

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6
   7 #include "portable.h"
   8
   9 #include <stdio.h>
  10 #include <limits.h>
  11
  12 #include <ac/socket.h>
  13 #include <ac/errno.h>
  14 #include <ac/signal.h>
  15 #include <ac/string.h>
  16 #include <ac/time.h>
  17 #include <ac/unistd.h>
  18
  19 #include "ldap_pvt.h"
  20 #include "lutil.h"
  21 #include "slap.h"
  22
  23 /* protected by connections_mutex */
  24 static ldap_pvt_thread_mutex_t connections_mutex;
  25 static Connection *connections = NULL;
  26 static unsigned long conn_nextid = 0;
  27
  28 /* structure state (protected by connections_mutex) */
  29 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  30 #define SLAP_C_UNUSED                   0x01
  31 #define SLAP_C_USED                             0x02
  32
  33 /* connection state (protected by c_mutex ) */
  34 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  35 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  36 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  37 #define SLAP_C_BINDING                  0x03    /* binding */
  38 #define SLAP_C_CLOSING                  0x04    /* closing */
  39
  40 const char *
  41 connection_state2str( int state )
  42 {
  43         switch( state ) {
  44         case SLAP_C_INVALID:    return "!";
  45         case SLAP_C_INACTIVE:   return "|";
  46         case SLAP_C_ACTIVE:             return "";
  47         case SLAP_C_BINDING:    return "B";
  48         case SLAP_C_CLOSING:    return "C";
  49         }
  50
  51         return "?";
  52 }
  53
  54 static Connection* connection_get( ber_socket_t s );
  55
  56 static int connection_input( Connection *c );
  57 static void connection_close( Connection *c );
  58
  59 static int connection_op_activate( Connection *conn, Operation *op );
  60 static int connection_resched( Connection *conn );
  61 static void connection_abandon( Connection *conn );
  62 static void connection_destroy( Connection *c );
  63
  64 struct co_arg {
  65         Connection      *co_conn;
  66         Operation       *co_op;
  67 };
  68
  69 /*
  70  * Initialize connection management infrastructure.
  71  */
  72 int connections_init(void)
  73 {
  74         assert( connections == NULL );
  75
  76         if( connections != NULL) {
  77 #ifdef NEW_LOGGING
  78                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
  79                            "connections_init:  already initialized.\n" ));
  80 #else
  81                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  82                         0, 0, 0 );
  83 #endif
  84                 return -1;
  85         }
  86
  87         /* should check return of every call */
  88         ldap_pvt_thread_mutex_init( &connections_mutex );
  89
  90         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  91
  92         if( connections == NULL ) {
  93 #ifdef NEW_LOGGING
  94                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
  95                            "connections_init: allocation (%d * %ld) of connection array failed\n",
  96                            dtblsize, (long) sizeof(Connection) ));
  97 #else
  98                 Debug( LDAP_DEBUG_ANY,
  99                         "connections_init: allocation (%d*%ld) of connection array failed\n",
 100                         dtblsize, (long) sizeof(Connection), 0 );
 101 #endif
 102                 return -1;
 103         }
 104
 105     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 106     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 107
 108         /*
 109          * per entry initialization of the Connection array initialization
 110          * will be done by connection_init()
 111          */
 112
 113         return 0;
 114 }
 115
 116 /*
 117  * Destroy connection management infrastructure.
 118  */
 119 int connections_destroy(void)
 120 {
 121         ber_socket_t i;
 122
 123         /* should check return of every call */
 124
 125         if( connections == NULL) {
 126 #ifdef NEW_LOGGING
 127                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 128                            "connections_destroy: nothing to destroy.\n"));
 129 #else
 130                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 131                         0, 0, 0 );
 132 #endif
 133                 return -1;
 134         }
 135
 136         for ( i = 0; i < dtblsize; i++ ) {
 137                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 138                         ber_sockbuf_free( connections[i].c_sb );
 139                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 140                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 141                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 142                 }
 143         }
 144
 145         free( connections );
 146         connections = NULL;
 147
 148         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 149         return 0;
 150 }
 151
 152 /*
 153  * shutdown all connections
 154  */
 155 int connections_shutdown(void)
 156 {
 157         ber_socket_t i;
 158
 159         ldap_pvt_thread_mutex_lock( &connections_mutex );
 160
 161         for ( i = 0; i < dtblsize; i++ ) {
 162                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 163                         continue;
 164                 }
 165
 166                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 167
 168                 /* connections_mutex and c_mutex are locked */
 169                 connection_closing( &connections[i] );
 170                 connection_close( &connections[i] );
 171
 172                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 173         }
 174
 175         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 176
 177         return 0;
 178 }
 179
 180 /*
 181  * Timeout idle connections.
 182  */
 183 int connections_timeout_idle(time_t now)
 184 {
 185         int i = 0;
 186         int connindex;
 187         Connection* c;
 188
 189         for( c = connection_first( &connindex );
 190                 c != NULL;
 191                 c = connection_next( c, &connindex ) )
 192         {
 193                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 194                         /* close it */
 195                         connection_closing( c );
 196                         connection_close( c );
 197                         i++;
 198                 }
 199         }
 200         connection_done( c );
 201
 202         return i;
 203 }
 204
 205 static Connection* connection_get( ber_socket_t s )
 206 {
 207         /* connections_mutex should be locked by caller */
 208
 209         Connection *c;
 210
 211 #ifdef NEW_LOGGING
 212         LDAP_LOG(( "connection", LDAP_LEVEL_ENTRY,
 213                    "connection_get: socket %ld\n", (long)s ));
 214 #else
 215         Debug( LDAP_DEBUG_ARGS,
 216                 "connection_get(%ld)\n",
 217                 (long) s, 0, 0 );
 218 #endif
 219
 220         assert( connections != NULL );
 221
 222         if(s == AC_SOCKET_INVALID) {
 223                 return NULL;
 224         }
 225
 226 #ifndef HAVE_WINSOCK
 227         c = &connections[s];
 228
 229         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 230
 231 #else
 232         c = NULL;
 233         {
 234                 ber_socket_t i, sd;
 235
 236                 for(i=0; i<dtblsize; i++) {
 237                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 238                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 239                                 assert( connections[i].c_sb == 0 );
 240                                 break;
 241                         }
 242
 243                         ber_sockbuf_ctrl( connections[i].c_sb,
 244                                 LBER_SB_OPT_GET_FD, &sd );
 245
 246                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 247                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 248                                 assert( sd == AC_SOCKET_INVALID );
 249                                 continue;
 250                         }
 251
 252                         /* state can actually change from used -> unused by resched,
 253                          * so don't assert details here.
 254                          */
 255
 256                         if( sd == s ) {
 257                                 c = &connections[i];
 258                                 break;
 259                         }
 260                 }
 261         }
 262 #endif
 263
 264         if( c != NULL ) {
 265                 ber_socket_t    sd;
 266
 267                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 268
 269                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 270                 if( c->c_struct_state != SLAP_C_USED ) {
 271                         /* connection must have been closed due to resched */
 272
 273                         assert( c->c_conn_state == SLAP_C_INVALID );
 274                         assert( sd == AC_SOCKET_INVALID );
 275
 276 #ifdef NEW_LOGGING
 277                         LDAP_LOG(( "connection", LDAP_LEVEL_ARGS,
 278                                    "connection_get:  connection %d not used\n", s ));
 279 #else
 280                         Debug( LDAP_DEBUG_TRACE,
 281                                 "connection_get(%d): connection not used\n",
 282                                 s, 0, 0 );
 283 #endif
 284
 285                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 286                         return NULL;
 287                 }
 288
 289 #ifdef NEW_LOGGING
 290                 LDAP_LOG(( "connection", LDAP_LEVEL_RESULTS,
 291                            "connection_get: get for %d got connid %lu\n", s, c->c_connid ));
 292 #else
 293                 Debug( LDAP_DEBUG_TRACE,
 294                         "connection_get(%d): got connid=%lu\n",
 295                         s, c->c_connid, 0 );
 296 #endif
 297
 298                 c->c_n_get++;
 299
 300                 assert( c->c_struct_state == SLAP_C_USED );
 301                 assert( c->c_conn_state != SLAP_C_INVALID );
 302                 assert( sd != AC_SOCKET_INVALID );
 303
 304 #ifdef SLAPD_MONITOR
 305                 c->c_activitytime = slap_get_time();
 306 #else
 307                 if( global_idletimeout > 0 ) {
 308                         c->c_activitytime = slap_get_time();
 309                 }
 310 #endif
 311         }
 312
 313         return c;
 314 }
 315
 316 static void connection_return( Connection *c )
 317 {
 318         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 319 }
 320
 321 long connection_init(
 322         ber_socket_t s,
 323         const char* url,
 324         const char* dnsname,
 325         const char* peername,
 326         const char* sockname,
 327         int tls_udp_option,
 328         slap_ssf_t ssf,
 329         const char *authid )
 330 {
 331         unsigned long id;
 332         Connection *c;
 333
 334         assert( connections != NULL );
 335
 336         assert( dnsname != NULL );
 337         assert( peername != NULL );
 338         assert( sockname != NULL );
 339
 340 #ifndef HAVE_TLS
 341         assert( tls_udp_option != 1 );
 342 #endif
 343
 344         if( s == AC_SOCKET_INVALID ) {
 345 #ifdef NEW_LOGGING
 346                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 347                            "connection_init: init of socket %ld invalid.\n", (long)s ));
 348 #else
 349                 Debug( LDAP_DEBUG_ANY,
 350                        "connection_init(%ld): invalid.\n",
 351                        (long) s, 0, 0 );
 352 #endif
 353                 return -1;
 354         }
 355
 356         assert( s >= 0 );
 357 #ifndef HAVE_WINSOCK
 358         assert( s < dtblsize );
 359 #endif
 360
 361         ldap_pvt_thread_mutex_lock( &connections_mutex );
 362
 363 #ifndef HAVE_WINSOCK
 364         c = &connections[s];
 365
 366 #else
 367         {
 368                 ber_socket_t    i;
 369
 370                 c = NULL;
 371
 372         for( i=0; i < dtblsize; i++) {
 373                 ber_socket_t    sd;
 374
 375             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 376                 assert( connections[i].c_sb == 0 );
 377                 c = &connections[i];
 378                 break;
 379             }
 380
 381                         sd = AC_SOCKET_INVALID;
 382                         if (connections[i].c_sb != NULL)
 383                         ber_sockbuf_ctrl( connections[i].c_sb, LBER_SB_OPT_GET_FD, &sd );
 384
 385             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 386                 assert( sd == AC_SOCKET_INVALID );
 387                 c = &connections[i];
 388                 break;
 389             }
 390
 391             assert( connections[i].c_struct_state == SLAP_C_USED );
 392             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 393             assert( sd != AC_SOCKET_INVALID );
 394         }
 395
 396         if( c == NULL ) {
 397 #ifdef NEW_LOGGING
 398                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 399                            "connection_init: skt %d      connection table full (%d/%d)\n",
 400                            s, i, dtblsize ));
 401 #else
 402                 Debug( LDAP_DEBUG_ANY,
 403                                 "connection_init(%d): connection table full (%d/%d)\n",
 404                                 s, i, dtblsize);
 405 #endif
 406             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 407             return -1;
 408         }
 409     }
 410 #endif
 411
 412     assert( c != NULL );
 413
 414         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 415                 c->c_authmech.bv_val = NULL;
 416                 c->c_authmech.bv_len = 0;
 417                 c->c_dn.bv_val = NULL;
 418                 c->c_dn.bv_len = 0;
 419                 c->c_ndn.bv_val = NULL;
 420                 c->c_ndn.bv_len = 0;
 421                 c->c_cdn.bv_val = NULL;
 422                 c->c_cdn.bv_len = 0;
 423                 c->c_groups = NULL;
 424
 425                 c->c_listener_url.bv_val = NULL;
 426                 c->c_listener_url.bv_len = 0;
 427                 c->c_peer_domain.bv_val = NULL;
 428                 c->c_peer_domain.bv_len = 0;
 429                 c->c_peer_name.bv_val = NULL;
 430                 c->c_peer_name.bv_len = 0;
 431                 c->c_sock_name.bv_val = NULL;
 432                 c->c_sock_name.bv_len = 0;
 433
 434                 LDAP_STAILQ_INIT(&c->c_ops);
 435                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 436
 437                 c->c_sasl_bind_mech.bv_val = NULL;
 438                 c->c_sasl_bind_mech.bv_len = 0;
 439                 c->c_sasl_context = NULL;
 440                 c->c_sasl_extra = NULL;
 441
 442                 c->c_sb = ber_sockbuf_alloc( );
 443
 444                 {
 445                         ber_len_t max = sockbuf_max_incoming;
 446                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 447                 }
 448
 449                 c->c_currentber = NULL;
 450
 451                 /* should check status of thread calls */
 452                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 453                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 454                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 455
 456                 c->c_struct_state = SLAP_C_UNUSED;
 457         }
 458
 459     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 460
 461     assert( c->c_struct_state == SLAP_C_UNUSED );
 462     assert( c->c_authmech.bv_val == NULL );
 463     assert( c->c_dn.bv_val == NULL );
 464     assert( c->c_ndn.bv_val == NULL );
 465     assert( c->c_cdn.bv_val == NULL );
 466     assert( c->c_groups == NULL );
 467     assert( c->c_listener_url.bv_val == NULL );
 468     assert( c->c_peer_domain.bv_val == NULL );
 469     assert( c->c_peer_name.bv_val == NULL );
 470     assert( c->c_sock_name.bv_val == NULL );
 471     assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 472     assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 473         assert( c->c_sasl_bind_mech.bv_val == NULL );
 474         assert( c->c_sasl_context == NULL );
 475         assert( c->c_sasl_extra == NULL );
 476         assert( c->c_currentber == NULL );
 477
 478         ber_str2bv( url, 0, 1, &c->c_listener_url );
 479         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 480         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 481         ber_str2bv( sockname, 0, 1, &c->c_sock_name );
 482
 483     c->c_n_ops_received = 0;
 484     c->c_n_ops_executing = 0;
 485     c->c_n_ops_pending = 0;
 486     c->c_n_ops_completed = 0;
 487
 488         c->c_n_get = 0;
 489         c->c_n_read = 0;
 490         c->c_n_write = 0;
 491
 492         /* set to zero until bind, implies LDAP_VERSION3 */
 493         c->c_protocol = 0;
 494
 495 #ifdef SLAPD_MONITOR
 496         c->c_activitytime = c->c_starttime = slap_get_time();
 497 #else
 498         if( global_idletimeout > 0 ) {
 499                 c->c_activitytime = c->c_starttime = slap_get_time();
 500         }
 501 #endif
 502
 503 #ifdef LDAP_CONNECTIONLESS
 504         c->c_is_udp = 0;
 505         if (tls_udp_option == 2)
 506         {
 507                 c->c_is_udp = 1;
 508 #ifdef LDAP_DEBUG
 509         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 510                 LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 511 #endif
 512         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 513                 LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 514         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 515                 LBER_SBIOD_LEVEL_PROVIDER, NULL );
 516         } else
 517 #endif
 518         {
 519 #ifdef LDAP_DEBUG
 520         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 521                 LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 522 #endif
 523         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 524                 LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 525         }
 526
 527 #ifdef LDAP_DEBUG
 528         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 529                 INT_MAX, (void*)"ldap_" );
 530 #endif
 531
 532         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 533                 c /* non-NULL */ ) < 0 )
 534         {
 535 #ifdef NEW_LOGGING
 536                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 537                            "connection_init: conn %lu  set nonblocking failed\n",
 538                            c->c_connid ));
 539 #else
 540                 Debug( LDAP_DEBUG_ANY,
 541                         "connection_init(%d, %s): set nonblocking failed\n",
 542                         s, c->c_peer_name.bv_val, 0 );
 543 #endif
 544         }
 545
 546     id = c->c_connid = conn_nextid++;
 547
 548     c->c_conn_state = SLAP_C_INACTIVE;
 549     c->c_struct_state = SLAP_C_USED;
 550
 551         c->c_ssf = c->c_transport_ssf = ssf;
 552         c->c_tls_ssf = 0;
 553
 554 #ifdef HAVE_TLS
 555     if ( tls_udp_option == 1 ) {
 556             c->c_is_tls = 1;
 557             c->c_needs_tls_accept = 1;
 558     } else {
 559             c->c_is_tls = 0;
 560             c->c_needs_tls_accept = 0;
 561     }
 562 #endif
 563
 564         slap_sasl_open( c );
 565         slap_sasl_external( c, ssf, authid );
 566
 567     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 568     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 569
 570     backend_connection_init(c);
 571
 572     return id;
 573 }
 574
 575 void connection2anonymous( Connection *c )
 576 {
 577     assert( connections != NULL );
 578     assert( c != NULL );
 579
 580         {
 581                 ber_len_t max = sockbuf_max_incoming;
 582                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 583         }
 584
 585         if(c->c_authmech.bv_val != NULL ) {
 586                 free(c->c_authmech.bv_val);
 587                 c->c_authmech.bv_val = NULL;
 588         }
 589         c->c_authmech.bv_len = 0;
 590
 591     if(c->c_dn.bv_val != NULL) {
 592         free(c->c_dn.bv_val);
 593         c->c_dn.bv_val = NULL;
 594     }
 595     c->c_dn.bv_len = 0;
 596     if(c->c_ndn.bv_val != NULL) {
 597         free(c->c_ndn.bv_val);
 598         c->c_ndn.bv_val = NULL;
 599     }
 600     c->c_ndn.bv_len = 0;
 601
 602         if(c->c_cdn.bv_val != NULL) {
 603                 free(c->c_cdn.bv_val);
 604                 c->c_cdn.bv_val = NULL;
 605         }
 606         c->c_cdn.bv_len = 0;
 607
 608         c->c_authc_backend = NULL;
 609         c->c_authz_backend = NULL;
 610
 611     {
 612         GroupAssertion *g, *n;
 613         for (g = c->c_groups; g; g=n)
 614         {
 615             n = g->ga_next;
 616             free(g);
 617         }
 618         c->c_groups = NULL;
 619     }
 620
 621 }
 622
 623 static void
 624 connection_destroy( Connection *c )
 625 {
 626         /* note: connections_mutex should be locked by caller */
 627     ber_socket_t        sd;
 628
 629     assert( connections != NULL );
 630     assert( c != NULL );
 631     assert( c->c_struct_state != SLAP_C_UNUSED );
 632     assert( c->c_conn_state != SLAP_C_INVALID );
 633     assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 634
 635     backend_connection_destroy(c);
 636
 637     c->c_protocol = 0;
 638     c->c_connid = -1;
 639
 640     c->c_activitytime = c->c_starttime = 0;
 641
 642         connection2anonymous( c );
 643
 644         if(c->c_listener_url.bv_val != NULL) {
 645                 free(c->c_listener_url.bv_val);
 646                 c->c_listener_url.bv_val = NULL;
 647         }
 648         c->c_listener_url.bv_len = 0;
 649
 650         if(c->c_peer_domain.bv_val != NULL) {
 651                 free(c->c_peer_domain.bv_val);
 652                 c->c_peer_domain.bv_val = NULL;
 653         }
 654         c->c_peer_domain.bv_len = 0;
 655         if(c->c_peer_name.bv_val != NULL) {
 656 #ifdef LDAP_PF_LOCAL
 657                 /*
 658                  * If peer was a domain socket, unlink. Mind you,
 659                  * they may be un-named. Should we leave this to
 660                  * the client?
 661                  */
 662                 if (strncmp(c->c_peer_name.bv_val, "PATH=",
 663                                         sizeof("PATH=") - 1) == 0) {
 664                         char *path = c->c_peer_name.bv_val
 665                                 + sizeof("PATH=") - 1;
 666                         if (path[0] != '\0') {
 667                                 (void)unlink(path);
 668                         }
 669                 }
 670 #endif /* LDAP_PF_LOCAL */
 671
 672                 free(c->c_peer_name.bv_val);
 673                 c->c_peer_name.bv_val = NULL;
 674         }
 675         c->c_peer_name.bv_len = 0;
 676         if(c->c_sock_name.bv_val != NULL) {
 677                 free(c->c_sock_name.bv_val);
 678                 c->c_sock_name.bv_val = NULL;
 679         }
 680         c->c_sock_name.bv_len = 0;
 681
 682         c->c_sasl_bind_in_progress = 0;
 683         if(c->c_sasl_bind_mech.bv_val != NULL) {
 684                 free(c->c_sasl_bind_mech.bv_val);
 685                 c->c_sasl_bind_mech.bv_val = NULL;
 686         }
 687         c->c_sasl_bind_mech.bv_len = 0;
 688
 689         slap_sasl_close( c );
 690
 691         if ( c->c_currentber != NULL ) {
 692                 ber_free( c->c_currentber, 1 );
 693                 c->c_currentber = NULL;
 694         }
 695
 696         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 697         if ( sd != AC_SOCKET_INVALID ) {
 698                 slapd_remove( sd, 0 );
 699
 700                 Statslog( LDAP_DEBUG_STATS,
 701                     "conn=%lu fd=%d closed\n",
 702                         c->c_connid, sd, 0, 0, 0 );
 703         }
 704
 705         ber_sockbuf_free( c->c_sb );
 706
 707         c->c_sb = ber_sockbuf_alloc( );
 708
 709         {
 710                 ber_len_t max = sockbuf_max_incoming;
 711                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 712         }
 713
 714     c->c_conn_state = SLAP_C_INVALID;
 715     c->c_struct_state = SLAP_C_UNUSED;
 716 }
 717
 718 int connection_state_closing( Connection *c )
 719 {
 720         /* c_mutex must be locked by caller */
 721
 722         int state;
 723         assert( c != NULL );
 724         assert( c->c_struct_state == SLAP_C_USED );
 725
 726         state = c->c_conn_state;
 727
 728         assert( state != SLAP_C_INVALID );
 729
 730         return state == SLAP_C_CLOSING;
 731 }
 732
 733 static void connection_abandon( Connection *c )
 734 {
 735         /* c_mutex must be locked by caller */
 736
 737         Operation *o;
 738
 739         LDAP_STAILQ_FOREACH(o, &c->c_ops, o_next) {
 740                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 741                 o->o_abandon = 1;
 742                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 743         }
 744
 745         /* remove pending operations */
 746         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 747                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 748                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 749                 slap_op_free( o );
 750         }
 751 }
 752
 753 void connection_closing( Connection *c )
 754 {
 755         assert( connections != NULL );
 756         assert( c != NULL );
 757         assert( c->c_struct_state == SLAP_C_USED );
 758         assert( c->c_conn_state != SLAP_C_INVALID );
 759
 760         /* c_mutex must be locked by caller */
 761
 762         if( c->c_conn_state != SLAP_C_CLOSING ) {
 763                 ber_socket_t    sd;
 764
 765                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 766 #ifdef NEW_LOGGING
 767                 LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
 768                            "connection_closing: conn %lu readying socket %d for close.\n",
 769                            c->c_connid, sd ));
 770 #else
 771                 Debug( LDAP_DEBUG_TRACE,
 772                         "connection_closing: readying conn=%lu sd=%d for close\n",
 773                         c->c_connid, sd, 0 );
 774 #endif
 775                 /* update state to closing */
 776                 c->c_conn_state = SLAP_C_CLOSING;
 777
 778                 /* don't listen on this port anymore */
 779                 slapd_clr_read( sd, 1 );
 780
 781                 /* abandon active operations */
 782                 connection_abandon( c );
 783
 784                 /* wake write blocked operations */
 785                 slapd_clr_write( sd, 1 );
 786                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 787         }
 788 }
 789
 790 static void connection_close( Connection *c )
 791 {
 792         ber_socket_t    sd;
 793
 794         assert( connections != NULL );
 795         assert( c != NULL );
 796         assert( c->c_struct_state == SLAP_C_USED );
 797         assert( c->c_conn_state == SLAP_C_CLOSING );
 798
 799         /* note: connections_mutex and c_mutex should be locked by caller */
 800
 801         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 802         if( !LDAP_STAILQ_EMPTY(&c->c_ops) ) {
 803 #ifdef NEW_LOGGING
 804                 LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
 805                            "connection_close: conn %lu  deferring sd %d\n",
 806                            c->c_connid, sd ));
 807 #else
 808                 Debug( LDAP_DEBUG_TRACE,
 809                         "connection_close: deferring conn=%lu sd=%d\n",
 810                         c->c_connid, sd, 0 );
 811 #endif
 812                 return;
 813         }
 814
 815 #ifdef NEW_LOGGING
 816         LDAP_LOG(( "connection", LDAP_LEVEL_RESULTS,
 817                    "connection_close: conn %lu  sd %d\n",
 818                    c->c_connid, sd ));
 819 #else
 820         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 821                 c->c_connid, sd, 0 );
 822 #endif
 823         connection_destroy( c );
 824 }
 825
 826 unsigned long connections_nextid(void)
 827 {
 828         unsigned long id;
 829         assert( connections != NULL );
 830
 831         ldap_pvt_thread_mutex_lock( &connections_mutex );
 832
 833         id = conn_nextid;
 834
 835         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 836
 837         return id;
 838 }
 839
 840 Connection* connection_first( ber_socket_t *index )
 841 {
 842         assert( connections != NULL );
 843         assert( index != NULL );
 844
 845         ldap_pvt_thread_mutex_lock( &connections_mutex );
 846
 847         *index = 0;
 848
 849         return connection_next(NULL, index);
 850 }
 851
 852 Connection* connection_next( Connection *c, ber_socket_t *index )
 853 {
 854         assert( connections != NULL );
 855         assert( index != NULL );
 856         assert( *index <= dtblsize );
 857
 858         if( c != NULL ) {
 859                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 860         }
 861
 862         c = NULL;
 863
 864         for(; *index < dtblsize; (*index)++) {
 865                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 866                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 867 #ifndef HAVE_WINSOCK
 868                         continue;
 869 #else
 870                         break;
 871 #endif
 872                 }
 873
 874                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 875                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 876                         c = &connections[(*index)++];
 877                         break;
 878                 }
 879
 880                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 881                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 882         }
 883
 884         if( c != NULL ) {
 885                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 886         }
 887
 888         return c;
 889 }
 890
 891 void connection_done( Connection *c )
 892 {
 893         assert( connections != NULL );
 894
 895         if( c != NULL ) {
 896                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 897         }
 898
 899         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 900 }
 901
 902 /*
 903  * connection_activity - handle the request operation op on connection
 904  * conn.  This routine figures out what kind of operation it is and
 905  * calls the appropriate stub to handle it.
 906  */
 907
 908 static void *
 909 connection_operation( void *arg_v )
 910 {
 911         int rc;
 912         struct co_arg   *arg = arg_v;
 913         ber_tag_t tag = arg->co_op->o_tag;
 914         Connection *conn = arg->co_conn;
 915
 916         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 917         num_ops_initiated++;
 918         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 919
 920         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 921 #ifdef NEW_LOGGING
 922                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
 923                            "connection_operation: conn %lu  SASL bind in progress (tag=%ld).\n",
 924                            conn->c_connid, (long)tag ));
 925 #else
 926                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 927                         "error: SASL bind in progress (tag=%ld).\n",
 928                         (long) tag, 0, 0 );
 929 #endif
 930                 send_ldap_result( conn, arg->co_op,
 931                         rc = LDAP_OPERATIONS_ERROR,
 932                         NULL, "SASL bind in progress", NULL, NULL );
 933                 goto operations_error;
 934         }
 935
 936         switch ( tag ) {
 937         case LDAP_REQ_BIND:
 938                 rc = do_bind( conn, arg->co_op );
 939                 break;
 940
 941         case LDAP_REQ_UNBIND:
 942                 rc = do_unbind( conn, arg->co_op );
 943                 break;
 944
 945         case LDAP_REQ_ADD:
 946                 rc = do_add( conn, arg->co_op );
 947                 break;
 948
 949         case LDAP_REQ_DELETE:
 950                 rc = do_delete( conn, arg->co_op );
 951                 break;
 952
 953         case LDAP_REQ_MODRDN:
 954                 rc = do_modrdn( conn, arg->co_op );
 955                 break;
 956
 957         case LDAP_REQ_MODIFY:
 958                 rc = do_modify( conn, arg->co_op );
 959                 break;
 960
 961         case LDAP_REQ_COMPARE:
 962                 rc = do_compare( conn, arg->co_op );
 963                 break;
 964
 965         case LDAP_REQ_SEARCH:
 966                 rc = do_search( conn, arg->co_op );
 967                 break;
 968
 969         case LDAP_REQ_ABANDON:
 970                 rc = do_abandon( conn, arg->co_op );
 971                 break;
 972
 973         case LDAP_REQ_EXTENDED:
 974                 rc = do_extended( conn, arg->co_op );
 975                 break;
 976
 977         default:
 978 #ifdef NEW_LOGGING
 979                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 980                            "connection_operation: conn %lu  unknown LDAP request 0x%lx\n",
 981                            conn->c_connid, tag ));
 982 #else
 983                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 984                     tag, 0, 0 );
 985 #endif
 986                 arg->co_op->o_tag = LBER_ERROR;
 987                 send_ldap_disconnect( conn, arg->co_op,
 988                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 989                 rc = -1;
 990                 break;
 991         }
 992
 993         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 994
 995 operations_error:
 996         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 997         num_ops_completed++;
 998         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 999
1000         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1001
1002         conn->c_n_ops_executing--;
1003         conn->c_n_ops_completed++;
1004
1005         LDAP_STAILQ_REMOVE( &conn->c_ops, arg->co_op, slap_op, o_next);
1006         LDAP_STAILQ_NEXT(arg->co_op, o_next) = NULL;
1007         slap_op_free( arg->co_op );
1008         arg->co_op = NULL;
1009         arg->co_conn = NULL;
1010         free( (char *) arg );
1011         arg = NULL;
1012
1013         switch( tag ) {
1014         case LBER_ERROR:
1015         case LDAP_REQ_UNBIND:
1016                 /* c_mutex is locked */
1017                 connection_closing( conn );
1018                 break;
1019
1020         case LDAP_REQ_BIND:
1021                 conn->c_sasl_bind_in_progress =
1022                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
1023
1024                 if( conn->c_conn_state == SLAP_C_BINDING) {
1025                         conn->c_conn_state = SLAP_C_ACTIVE;
1026                 }
1027         }
1028
1029         connection_resched( conn );
1030
1031         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1032
1033         return NULL;
1034 }
1035
1036 int connection_read(ber_socket_t s)
1037 {
1038         int rc = 0;
1039         Connection *c;
1040         assert( connections != NULL );
1041
1042         ldap_pvt_thread_mutex_lock( &connections_mutex );
1043
1044         /* get (locked) connection */
1045         c = connection_get( s );
1046
1047         if( c == NULL ) {
1048 #ifdef NEW_LOGGING
1049                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1050                            "connection_read: sock %ld no connection\n",
1051                            (long)s ));
1052 #else
1053                 Debug( LDAP_DEBUG_ANY,
1054                         "connection_read(%ld): no connection!\n",
1055                         (long) s, 0, 0 );
1056 #endif
1057                 slapd_remove(s, 0);
1058
1059                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1060                 return -1;
1061         }
1062
1063         c->c_n_read++;
1064
1065         if( c->c_conn_state == SLAP_C_CLOSING ) {
1066 #ifdef NEW_LOGGING
1067                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1068                            "connection_read: conn %lu connection closing, ignoring input\n",
1069                            c->c_connid));
1070 #else
1071                 Debug( LDAP_DEBUG_TRACE,
1072                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1073                         s, c->c_connid, 0 );
1074 #endif
1075                 connection_return( c );
1076                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1077                 return 0;
1078         }
1079
1080 #ifdef NEW_LOGGING
1081         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1082                    "connection_read: conn %lu  checking for input.\n", c->c_connid ));
1083 #else
1084         Debug( LDAP_DEBUG_TRACE,
1085                 "connection_read(%d): checking for input on id=%lu\n",
1086                 s, c->c_connid, 0 );
1087 #endif
1088
1089 #ifdef HAVE_TLS
1090         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1091                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
1092                 if ( rc < 0 ) {
1093 #if 0 /* required by next #if 0 */
1094                         struct timeval tv;
1095                         fd_set rfd;
1096 #endif
1097
1098 #ifdef NEW_LOGGING
1099                         LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1100                                    "connection_read: conn %lu  TLS accept error, error %d\n",
1101                                    c->c_connid, rc ));
1102 #else
1103                         Debug( LDAP_DEBUG_TRACE,
1104                                 "connection_read(%d): TLS accept error "
1105                                 "error=%d id=%lu, closing\n",
1106                                 s, rc, c->c_connid );
1107 #endif
1108                         c->c_needs_tls_accept = 0;
1109                         /* connections_mutex and c_mutex are locked */
1110                         connection_closing( c );
1111
1112 #if 0
1113                         /* Drain input before close, to allow SSL error codes
1114                          * to propagate to client. */
1115                         FD_ZERO(&rfd);
1116                         FD_SET(s, &rfd);
1117                         for (rc=1; rc>0;)
1118                         {
1119                             tv.tv_sec = 1;
1120                             tv.tv_usec = 0;
1121                             rc = select(s+1, &rfd, NULL, NULL, &tv);
1122                             if (rc == 1)
1123                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN,
1124                                     NULL);
1125                         }
1126 #endif
1127                         connection_close( c );
1128
1129                 } else if ( rc == 0 ) {
1130                         void *ssl;
1131                         char *authid;
1132
1133                         c->c_needs_tls_accept = 0;
1134
1135                         /* we need to let SASL know */
1136                         ssl = (void *)ldap_pvt_tls_sb_ctx( c->c_sb );
1137
1138                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1139                         if( c->c_tls_ssf > c->c_ssf ) {
1140                                 c->c_ssf = c->c_tls_ssf;
1141                         }
1142
1143                         authid = (char *)ldap_pvt_tls_get_peer( ssl );
1144                         slap_sasl_external( c, c->c_tls_ssf, authid );
1145                 }
1146                 connection_return( c );
1147                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1148                 return 0;
1149         }
1150 #endif
1151
1152 #ifdef HAVE_CYRUS_SASL
1153         if ( c->c_sasl_layers ) {
1154                 c->c_sasl_layers = 0;
1155
1156                 rc = ldap_pvt_sasl_install( c->c_sb,  c->c_sasl_context );
1157
1158                 if( rc != LDAP_SUCCESS ) {
1159 #ifdef NEW_LOGGING
1160                         LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1161                                    "connection_read: conn %lu SASL install error %d, closing\n",
1162                                    c->c_connid, rc ));
1163 #else
1164                         Debug( LDAP_DEBUG_TRACE,
1165                                 "connection_read(%d): SASL install error "
1166                                 "error=%d id=%lu, closing\n",
1167                                 s, rc, c->c_connid );
1168 #endif
1169                         /* connections_mutex and c_mutex are locked */
1170                         connection_closing( c );
1171                         connection_close( c );
1172                         connection_return( c );
1173                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1174                         return 0;
1175                 }
1176         }
1177 #endif
1178
1179 #define CONNECTION_INPUT_LOOP 1
1180
1181 #ifdef DATA_READY_LOOP
1182         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_DATA_READY, NULL ) )
1183 #elif CONNECTION_INPUT_LOOP
1184         while(!rc)
1185 #endif
1186         {
1187                 /* How do we do this without getting into a busy loop ? */
1188                 rc = connection_input( c );
1189         }
1190
1191         if( rc < 0 ) {
1192 #ifdef NEW_LOGGING
1193                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1194                            "connection_read: conn %lu  input error %d, closing.\n",
1195                            c->c_connid, rc ));
1196 #else
1197                 Debug( LDAP_DEBUG_TRACE,
1198                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1199                         s, rc, c->c_connid );
1200 #endif
1201                 /* connections_mutex and c_mutex are locked */
1202                 connection_closing( c );
1203                 connection_close( c );
1204                 connection_return( c );
1205                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1206                 return 0;
1207         }
1208
1209         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1210                 slapd_set_read( s, 1 );
1211         }
1212
1213         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1214                 slapd_set_write( s, 1 );
1215         }
1216
1217         connection_return( c );
1218         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1219         return 0;
1220 }
1221
1222 static int
1223 connection_input(
1224     Connection *conn
1225 )
1226 {
1227         Operation *op;
1228         ber_tag_t       tag;
1229         ber_len_t       len;
1230         ber_int_t       msgid;
1231         BerElement      *ber;
1232 #ifdef LDAP_CONNECTIONLESS
1233         Sockaddr        peeraddr;
1234         char            *cdn = NULL;
1235 #endif
1236
1237         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
1238             == NULL ) {
1239 #ifdef NEW_LOGGING
1240                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1241                            "connection_input: conn %lu  ber_alloc failed.\n",
1242                            conn->c_connid ));
1243 #else
1244                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1245 #endif
1246                 return -1;
1247         }
1248
1249         errno = 0;
1250
1251 #ifdef LDAP_CONNECTIONLESS
1252         if (conn->c_is_udp)
1253         {
1254                 char    peername[sizeof("IP=255.255.255.255:65336")];
1255                 len = ber_int_sb_read(conn->c_sb, &peeraddr,
1256                         sizeof(struct sockaddr));
1257                 if (len != sizeof(struct sockaddr))
1258                         return 1;
1259                 sprintf( peername, "IP=%s:%d",
1260                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1261                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1262                 Statslog( LDAP_DEBUG_STATS,
1263                         "conn=%lu UDP request from %s (%s) accepted.\n",
1264                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1265         }
1266 #endif
1267         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1268         if ( tag != LDAP_TAG_MESSAGE ) {
1269                 int err = errno;
1270                 ber_socket_t    sd;
1271
1272                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1273
1274 #ifdef NEW_LOGGING
1275                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1276                            "connection_input: conn %lu  ber_get_next failed, errno %d (%s).\n",
1277                            conn->c_connid, err, sock_errstr(err) ));
1278 #else
1279                 Debug( LDAP_DEBUG_TRACE,
1280                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1281                         sd, err, sock_errstr(err) );
1282 #endif
1283                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1284                         /* log, close and send error */
1285                         ber_free( conn->c_currentber, 1 );
1286                         conn->c_currentber = NULL;
1287
1288                         return -2;
1289                 }
1290                 return 1;
1291         }
1292
1293         ber = conn->c_currentber;
1294         conn->c_currentber = NULL;
1295
1296         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1297                 /* log, close and send error */
1298 #ifdef NEW_LOGGING
1299                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1300                            "connection_input: conn %lu  ber_get_int returns 0x%lx.\n",
1301                            conn->c_connid, tag ));
1302 #else
1303                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
1304                     0 );
1305 #endif
1306                 ber_free( ber, 1 );
1307                 return -1;
1308         }
1309
1310         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1311                 /* log, close and send error */
1312 #ifdef NEW_LOGGING
1313                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1314                            "connection_input: conn %lu  ber_peek_tag returns 0x%lx.\n",
1315                            conn->c_connid, tag ));
1316 #else
1317                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
1318                     0 );
1319 #endif
1320                 ber_free( ber, 1 );
1321
1322                 return -1;
1323         }
1324
1325 #ifdef LDAP_CONNECTIONLESS
1326         if (conn->c_is_udp) {
1327                 if (tag == LBER_OCTETSTRING) {
1328                         ber_get_stringa( ber, &cdn );
1329                         tag = ber_peek_tag(ber, &len);
1330                 }
1331                 if (tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH) {
1332 #ifdef NEW_LOGGING
1333                     LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1334                                "connection_input: conn %lu  invalid req for UDP 0x%lx.\n",
1335                                conn->c_connid, tag ));
1336 #else
1337                     Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0,
1338                         0 );
1339 #endif
1340                     ber_free( ber, 1 );
1341                     return 0;
1342                 }
1343         }
1344 #endif
1345         if(tag == LDAP_REQ_BIND) {
1346                 /* immediately abandon all exiting operations upon BIND */
1347                 connection_abandon( conn );
1348         }
1349
1350         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1351
1352         op->o_pagedresults_state = conn->c_pagedresults_state;
1353
1354 #ifdef LDAP_CONNECTIONLESS
1355         op->o_peeraddr = peeraddr;
1356         if (cdn) {
1357             ber_str2bv( cdn, 0, 1, &op->o_dn );
1358             op->o_protocol = LDAP_VERSION2;
1359         }
1360 #endif
1361         if ( conn->c_conn_state == SLAP_C_BINDING
1362                 || conn->c_conn_state == SLAP_C_CLOSING )
1363         {
1364 #ifdef NEW_LOGGING
1365                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1366                            "connection_input: conn %lu  deferring operation\n",
1367                            conn->c_connid ));
1368 #else
1369                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1370 #endif
1371                 conn->c_n_ops_pending++;
1372                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1373
1374         } else {
1375                 conn->c_n_ops_executing++;
1376                 connection_op_activate( conn, op );
1377         }
1378
1379 #ifdef NO_THREADS
1380         if ( conn->c_struct_state != SLAP_C_USED ) {
1381                 /* connection must have got closed underneath us */
1382                 return 1;
1383         }
1384 #endif
1385         assert( conn->c_struct_state == SLAP_C_USED );
1386
1387         return 0;
1388 }
1389
1390 static int
1391 connection_resched( Connection *conn )
1392 {
1393         Operation *op;
1394
1395         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1396                 int rc;
1397                 ber_socket_t    sd;
1398                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1399
1400                 /* us trylock to avoid possible deadlock */
1401                 rc = ldap_pvt_thread_mutex_trylock( &connections_mutex );
1402
1403                 if( rc ) {
1404 #ifdef NEW_LOGGING
1405                         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1406                                    "connection_resched: conn %lu  reaquiring locks.\n",
1407                                    conn->c_connid ));
1408 #else
1409                         Debug( LDAP_DEBUG_TRACE,
1410                                 "connection_resched: reaquiring locks conn=%lu sd=%d\n",
1411                                 conn->c_connid, sd, 0 );
1412 #endif
1413                         /*
1414                          * reaquire locks in the right order...
1415                          * this may allow another thread to close this connection,
1416                          * so recheck state below.
1417                          */
1418                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1419                         ldap_pvt_thread_mutex_lock( &connections_mutex );
1420                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1421                 }
1422
1423                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1424 #ifdef NEW_LOGGING
1425                         LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1426                                    "connection_resched: conn %lu  closed by other thread.\n",
1427                                    conn->c_connid ));
1428 #else
1429                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1430                                 "closed by other thread conn=%lu sd=%d\n",
1431                                 conn->c_connid, sd, 0 );
1432 #endif
1433                 } else {
1434 #ifdef NEW_LOGGING
1435                         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1436                                    "connection_resched: conn %lu  attempting closing.\n",
1437                                    conn->c_connid ));
1438 #else
1439                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1440                                 "attempting closing conn=%lu sd=%d\n",
1441                                 conn->c_connid, sd, 0 );
1442 #endif
1443                         connection_close( conn );
1444                 }
1445
1446                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1447                 return 0;
1448         }
1449
1450         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1451                 /* other states need different handling */
1452                 return 0;
1453         }
1454
1455         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1456                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1457                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1458                 /* pending operations should not be marked for abandonment */
1459                 assert(!op->o_abandon);
1460
1461                 conn->c_n_ops_pending--;
1462                 conn->c_n_ops_executing++;
1463
1464                 connection_op_activate( conn, op );
1465
1466                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1467                         break;
1468                 }
1469         }
1470         return 0;
1471 }
1472
1473 static int connection_op_activate( Connection *conn, Operation *op )
1474 {
1475         struct co_arg *arg;
1476         int status;
1477         ber_tag_t tag = op->o_tag;
1478
1479         if(tag == LDAP_REQ_BIND) {
1480                 conn->c_conn_state = SLAP_C_BINDING;
1481         }
1482
1483         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1484         arg->co_conn = conn;
1485         arg->co_op = op;
1486
1487         if (!arg->co_op->o_dn.bv_len) {
1488             arg->co_op->o_authz = conn->c_authz;
1489             arg->co_op->o_dn.bv_val = ch_strdup( conn->c_dn.bv_val ?
1490                 conn->c_dn.bv_val : "" );
1491             arg->co_op->o_ndn.bv_val = ch_strdup( conn->c_ndn.bv_val ?
1492                 conn->c_ndn.bv_val : "" );
1493         }
1494         arg->co_op->o_authtype = conn->c_authtype;
1495         ber_dupbv( &arg->co_op->o_authmech, &conn->c_authmech );
1496
1497         if (!arg->co_op->o_protocol) {
1498             arg->co_op->o_protocol = conn->c_protocol
1499                 ? conn->c_protocol : LDAP_VERSION3;
1500         }
1501         arg->co_op->o_connid = conn->c_connid;
1502
1503         LDAP_STAILQ_INSERT_TAIL( &conn->c_ops, arg->co_op, o_next );
1504
1505         status = ldap_pvt_thread_pool_submit( &connection_pool,
1506                 connection_operation, (void *) arg );
1507
1508         if ( status != 0 ) {
1509 #ifdef NEW_LOGGING
1510                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1511                            "connection_op_activate: conn %lu     thread pool submit failed.\n",
1512                            conn->c_connid ));
1513 #else
1514                 Debug( LDAP_DEBUG_ANY,
1515                 "ldap_pvt_thread_pool_submit failed (%d)\n", status, 0, 0 );
1516 #endif
1517                 /* should move op to pending list */
1518         }
1519
1520         return status;
1521 }
1522
1523 int connection_write(ber_socket_t s)
1524 {
1525         Connection *c;
1526         assert( connections != NULL );
1527
1528         ldap_pvt_thread_mutex_lock( &connections_mutex );
1529
1530         c = connection_get( s );
1531
1532         slapd_clr_write( s, 0);
1533
1534         if( c == NULL ) {
1535 #ifdef NEW_LOGGING
1536                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1537                            "connection_write: sock %ld  no connection!\n",(long)s));
1538 #else
1539                 Debug( LDAP_DEBUG_ANY,
1540                         "connection_write(%ld): no connection!\n",
1541                         (long) s, 0, 0 );
1542 #endif
1543                 slapd_remove(s, 0);
1544                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1545                 return -1;
1546         }
1547
1548         c->c_n_write++;
1549
1550 #ifdef NEW_LOGGING
1551         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1552                    "connection_write conn %lu  waking output.\n",
1553                    c->c_connid ));
1554 #else
1555         Debug( LDAP_DEBUG_TRACE,
1556                 "connection_write(%d): waking output for id=%lu\n",
1557                 s, c->c_connid, 0 );
1558 #endif
1559         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1560
1561         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
1562                 slapd_set_read( s, 1 );
1563         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
1564                 slapd_set_write( s, 1 );
1565         connection_return( c );
1566         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1567         return 0;
1568 }
1569