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

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-2000 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
  18 #include "ldap_pvt.h"
  19 #include "lutil.h"
  20 #include "slap.h"
  21
  22 /* protected by connections_mutex */
  23 static ldap_pvt_thread_mutex_t connections_mutex;
  24 static Connection *connections = NULL;
  25 static unsigned long conn_nextid = 0;
  26
  27 /* structure state (protected by connections_mutex) */
  28 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  29 #define SLAP_C_UNUSED                   0x01
  30 #define SLAP_C_USED                             0x02
  31
  32 /* connection state (protected by c_mutex ) */
  33 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  34 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  35 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  36 #define SLAP_C_BINDING                  0x03    /* binding */
  37 #define SLAP_C_CLOSING                  0x04    /* closing */
  38
  39 const char *
  40 connection_state2str( int state )
  41 {
  42         switch( state ) {
  43         case SLAP_C_INVALID:    return "!";
  44         case SLAP_C_INACTIVE:   return "|";
  45         case SLAP_C_ACTIVE:             return "";
  46         case SLAP_C_BINDING:    return "B";
  47         case SLAP_C_CLOSING:    return "C";
  48         }
  49
  50         return "?";
  51 }
  52
  53 static Connection* connection_get( ber_socket_t s );
  54
  55 static int connection_input( Connection *c );
  56 static void connection_close( Connection *c );
  57
  58 static int connection_op_activate( Connection *conn, Operation *op );
  59 static int connection_resched( Connection *conn );
  60 static void connection_abandon( Connection *conn );
  61 static void connection_destroy( Connection *c );
  62
  63 struct co_arg {
  64         Connection      *co_conn;
  65         Operation       *co_op;
  66 };
  67
  68 /*
  69  * Initialize connection management infrastructure.
  70  */
  71 int connections_init(void)
  72 {
  73         assert( connections == NULL );
  74
  75         if( connections != NULL) {
  76 #ifdef NEW_LOGGING
  77                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
  78                            "connections_init:  already initialized.\n" ));
  79 #else
  80                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  81                         0, 0, 0 );
  82 #endif
  83                 return -1;
  84         }
  85
  86         /* should check return of every call */
  87         ldap_pvt_thread_mutex_init( &connections_mutex );
  88
  89         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  90
  91         if( connections == NULL ) {
  92 #ifdef NEW_LOGGING
  93                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
  94                            "connections_init: allocation (%d * %ld) of connection array failed\n",
  95                            dtblsize, (long) sizeof(Connection) ));
  96 #else
  97                 Debug( LDAP_DEBUG_ANY,
  98                         "connections_init: allocation (%d*%ld) of connection array failed\n",
  99                         dtblsize, (long) sizeof(Connection), 0 );
 100 #endif
 101                 return -1;
 102         }
 103
 104     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 105     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 106
 107         /*
 108          * per entry initialization of the Connection array initialization
 109          * will be done by connection_init()
 110          */
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * Destroy connection management infrastructure.
 117  */
 118 int connections_destroy(void)
 119 {
 120         ber_socket_t i;
 121
 122         /* should check return of every call */
 123
 124         if( connections == NULL) {
 125 #ifdef NEW_LOGGING
 126                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 127                            "connections_destroy: nothing to destroy.\n"));
 128 #else
 129                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 130                         0, 0, 0 );
 131 #endif
 132                 return -1;
 133         }
 134
 135         for ( i = 0; i < dtblsize; i++ ) {
 136                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 137                         ber_sockbuf_free( connections[i].c_sb );
 138                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 139                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 140                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 141                 }
 142         }
 143
 144         free( connections );
 145         connections = NULL;
 146
 147         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 148         return 0;
 149 }
 150
 151 /*
 152  * shutdown all connections
 153  */
 154 int connections_shutdown(void)
 155 {
 156         ber_socket_t i;
 157
 158         ldap_pvt_thread_mutex_lock( &connections_mutex );
 159
 160         for ( i = 0; i < dtblsize; i++ ) {
 161                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 162                         continue;
 163                 }
 164
 165                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 166
 167                 /* connections_mutex and c_mutex are locked */
 168                 connection_closing( &connections[i] );
 169                 connection_close( &connections[i] );
 170
 171                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 172         }
 173
 174         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 175
 176         return 0;
 177 }
 178
 179 /*
 180  * Timeout idle connections.
 181  */
 182 int connections_timeout_idle(time_t now)
 183 {
 184         int i = 0;
 185         int connindex;
 186         Connection* c;
 187
 188         for( c = connection_first( &connindex );
 189                 c != NULL;
 190                 c = connection_next( c, &connindex ) )
 191         {
 192                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 193                         /* close it */
 194                         connection_closing( c );
 195                         connection_close( c );
 196                         i++;
 197                 }
 198         }
 199         connection_done( c );
 200
 201         return i;
 202 }
 203
 204 static Connection* connection_get( ber_socket_t s )
 205 {
 206         /* connections_mutex should be locked by caller */
 207
 208         Connection *c;
 209
 210 #ifdef NEW_LOGGING
 211         LDAP_LOG(( "connection", LDAP_LEVEL_ENTRY,
 212                    "connection_get: socket %ld\n", (long)s ));
 213 #else
 214         Debug( LDAP_DEBUG_ARGS,
 215                 "connection_get(%ld)\n",
 216                 (long) s, 0, 0 );
 217 #endif
 218
 219         assert( connections != NULL );
 220
 221         if(s == AC_SOCKET_INVALID) {
 222                 return NULL;
 223         }
 224
 225 #ifndef HAVE_WINSOCK
 226         c = &connections[s];
 227
 228         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 229
 230 #else
 231         c = NULL;
 232         {
 233                 ber_socket_t i, sd;
 234
 235                 for(i=0; i<dtblsize; i++) {
 236                         ber_sockbuf_ctrl( connections[i].c_sb,
 237                                 LBER_SB_OPT_GET_FD, &sd );
 238
 239                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 240                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 241                                 assert( connections[i].c_sb == 0 );
 242                                 break;
 243                         }
 244
 245                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 246                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 247                                 assert( sd == AC_SOCKET_INVALID );
 248                                 continue;
 249                         }
 250
 251                         /* state can actually change from used -> unused by resched,
 252                          * so don't assert details here.
 253                          */
 254
 255                         if( sd == s ) {
 256                                 c = &connections[i];
 257                                 break;
 258                         }
 259                 }
 260         }
 261 #endif
 262
 263         if( c != NULL ) {
 264                 ber_socket_t    sd;
 265
 266                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 267
 268                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 269                 if( c->c_struct_state != SLAP_C_USED ) {
 270                         /* connection must have been closed due to resched */
 271
 272                         assert( c->c_conn_state == SLAP_C_INVALID );
 273                         assert( sd == AC_SOCKET_INVALID );
 274
 275 #ifdef NEW_LOGGING
 276                         LDAP_LOG(( "connection", LDAP_LEVEL_ARGS,
 277                                    "connection_get:  connection %d not used\n", s ));
 278 #else
 279                         Debug( LDAP_DEBUG_TRACE,
 280                                 "connection_get(%d): connection not used\n",
 281                                 s, 0, 0 );
 282 #endif
 283
 284                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 285                         return NULL;
 286                 }
 287
 288 #ifdef NEW_LOGGING
 289                 LDAP_LOG(( "connection", LDAP_LEVEL_RESULTS,
 290                            "connection_get: get for %d got connid %ld\n",s, c->c_connid ));
 291 #else
 292                 Debug( LDAP_DEBUG_TRACE,
 293                         "connection_get(%d): got connid=%ld\n",
 294                         s, c->c_connid, 0 );
 295 #endif
 296
 297                 c->c_n_get++;
 298
 299                 assert( c->c_struct_state == SLAP_C_USED );
 300                 assert( c->c_conn_state != SLAP_C_INVALID );
 301                 assert( sd != AC_SOCKET_INVALID );
 302
 303         c->c_activitytime = slap_get_time();
 304         }
 305
 306         return c;
 307 }
 308
 309 static void connection_return( Connection *c )
 310 {
 311         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 312 }
 313
 314 long connection_init(
 315         ber_socket_t s,
 316         const char* url,
 317         const char* dnsname,
 318         const char* peername,
 319         const char* sockname,
 320         int tls_udp_option,
 321         slap_ssf_t ssf,
 322         const char *authid )
 323 {
 324         unsigned long id;
 325         Connection *c;
 326
 327         assert( connections != NULL );
 328
 329         assert( dnsname != NULL );
 330         assert( peername != NULL );
 331         assert( sockname != NULL );
 332
 333 #ifndef HAVE_TLS
 334         assert( tls_udp_option != 1 );
 335 #endif
 336
 337         if( s == AC_SOCKET_INVALID ) {
 338 #ifdef NEW_LOGGING
 339                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 340                            "connection_init: init of socket %ld invalid.\n", (long)s ));
 341 #else
 342                 Debug( LDAP_DEBUG_ANY,
 343                        "connection_init(%ld): invalid.\n",
 344                        (long) s, 0, 0 );
 345 #endif
 346                 return -1;
 347         }
 348
 349         assert( s >= 0 );
 350 #ifndef HAVE_WINSOCK
 351         assert( s < dtblsize );
 352 #endif
 353
 354         ldap_pvt_thread_mutex_lock( &connections_mutex );
 355
 356 #ifndef HAVE_WINSOCK
 357         c = &connections[s];
 358
 359 #else
 360         {
 361                 unsigned int i;
 362
 363                 c = NULL;
 364
 365         for( i=0; i < dtblsize; i++) {
 366                 ber_socket_t    sd;
 367
 368             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 369                 assert( connections[i].c_sb == 0 );
 370                 c = &connections[i];
 371                 break;
 372             }
 373
 374                         sd = AC_SOCKET_INVALID;
 375                         if (connections[i].c_sb != NULL)
 376                         ber_sockbuf_ctrl( connections[i].c_sb, LBER_SB_OPT_GET_FD, &sd );
 377
 378             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 379                 assert( sd == AC_SOCKET_INVALID );
 380                 c = &connections[i];
 381                 break;
 382             }
 383
 384             assert( connections[i].c_struct_state == SLAP_C_USED );
 385             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 386             assert( sd != AC_SOCKET_INVALID );
 387         }
 388
 389         if( c == NULL ) {
 390 #ifdef NEW_LOGGING
 391                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 392                            "connection_init: skt %d      connection table full (%d/%d)\n",
 393                            s, i, dtblsize ));
 394 #else
 395                 Debug( LDAP_DEBUG_ANY,
 396                                 "connection_init(%d): connection table full (%d/%d)\n",
 397                                 s, i, dtblsize);
 398 #endif
 399             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 400             return -1;
 401         }
 402     }
 403 #endif
 404
 405     assert( c != NULL );
 406
 407         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 408                 c->c_authmech = NULL;
 409                 c->c_dn = NULL;
 410                 c->c_cdn = NULL;
 411
 412                 c->c_listener_url = NULL;
 413                 c->c_peer_domain = NULL;
 414                 c->c_peer_name = NULL;
 415                 c->c_sock_name = NULL;
 416
 417                 c->c_ops = NULL;
 418                 c->c_pending_ops = NULL;
 419
 420                 c->c_sasl_bind_mech = NULL;
 421                 c->c_sasl_context = NULL;
 422                 c->c_sasl_extra = NULL;
 423
 424                 c->c_sb = ber_sockbuf_alloc( );
 425
 426                 {
 427                         ber_len_t max = sockbuf_max_incoming;
 428                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 429                 }
 430
 431                 c->c_currentber = NULL;
 432
 433                 /* should check status of thread calls */
 434                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 435                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 436                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 437
 438                 c->c_struct_state = SLAP_C_UNUSED;
 439         }
 440
 441     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 442
 443     assert( c->c_struct_state == SLAP_C_UNUSED );
 444         assert( c->c_authmech == NULL );
 445     assert(     c->c_dn == NULL );
 446     assert(     c->c_cdn == NULL );
 447     assert( c->c_listener_url == NULL );
 448     assert( c->c_peer_domain == NULL );
 449     assert( c->c_peer_name == NULL );
 450     assert( c->c_sock_name == NULL );
 451     assert( c->c_ops == NULL );
 452     assert( c->c_pending_ops == NULL );
 453         assert( c->c_sasl_bind_mech == NULL );
 454         assert( c->c_sasl_context == NULL );
 455         assert( c->c_sasl_extra == NULL );
 456         assert( c->c_currentber == NULL );
 457
 458         c->c_listener_url = ch_strdup( url  );
 459         c->c_peer_domain = ch_strdup( dnsname  );
 460     c->c_peer_name = ch_strdup( peername  );
 461     c->c_sock_name = ch_strdup( sockname );
 462
 463     c->c_n_ops_received = 0;
 464     c->c_n_ops_executing = 0;
 465     c->c_n_ops_pending = 0;
 466     c->c_n_ops_completed = 0;
 467
 468         c->c_n_get = 0;
 469         c->c_n_read = 0;
 470         c->c_n_write = 0;
 471
 472         /* set to zero until bind, implies LDAP_VERSION3 */
 473         c->c_protocol = 0;
 474
 475     c->c_activitytime = c->c_starttime = slap_get_time();
 476
 477 #ifdef LDAP_CONNECTIONLESS
 478         c->c_is_udp = 0;
 479         if (tls_udp_option == 2)
 480         {
 481                 c->c_is_udp = 1;
 482                 c->c_protocol = LDAP_VERSION2;
 483 #ifdef LDAP_DEBUG
 484         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 485                 LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 486 #endif
 487         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 488                 LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 489         } else
 490 #endif
 491         {
 492 #ifdef LDAP_DEBUG
 493         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 494                 LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 495 #endif
 496         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 497                 LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 498         }
 499         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 500                 LBER_SBIOD_LEVEL_PROVIDER, NULL );
 501
 502 #ifdef LDAP_DEBUG
 503         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 504                 INT_MAX, (void*)"ldap_" );
 505 #endif
 506
 507         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 508                 c /* non-NULL */ ) < 0 )
 509         {
 510 #ifdef NEW_LOGGING
 511                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 512                            "connection_init: conn %d  set nonblocking failed\n",
 513                            c->c_connid ));
 514 #else
 515                 Debug( LDAP_DEBUG_ANY,
 516                         "connection_init(%d, %s): set nonblocking failed\n",
 517                         s, c->c_peer_name, 0 );
 518 #endif
 519         }
 520
 521     id = c->c_connid = conn_nextid++;
 522
 523     c->c_conn_state = SLAP_C_INACTIVE;
 524     c->c_struct_state = SLAP_C_USED;
 525
 526         c->c_ssf = c->c_transport_ssf = ssf;
 527         c->c_tls_ssf = 0;
 528
 529 #ifdef HAVE_TLS
 530     if ( tls_udp_option == 1 ) {
 531             c->c_is_tls = 1;
 532             c->c_needs_tls_accept = 1;
 533     } else {
 534             c->c_is_tls = 0;
 535             c->c_needs_tls_accept = 0;
 536     }
 537 #endif
 538
 539         slap_sasl_open( c );
 540         slap_sasl_external( c, ssf, authid );
 541
 542     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 543     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 544
 545     backend_connection_init(c);
 546
 547     return id;
 548 }
 549
 550 void connection2anonymous( Connection *c )
 551 {
 552     assert( connections != NULL );
 553     assert( c != NULL );
 554
 555         {
 556                 ber_len_t max = sockbuf_max_incoming;
 557                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 558         }
 559
 560         if(c->c_authmech != NULL ) {
 561                 free(c->c_authmech);
 562                 c->c_authmech = NULL;
 563         }
 564
 565     if(c->c_dn != NULL) {
 566         free(c->c_dn);
 567         c->c_dn = NULL;
 568     }
 569
 570         if(c->c_cdn != NULL) {
 571                 free(c->c_cdn);
 572                 c->c_cdn = NULL;
 573         }
 574
 575         c->c_authc_backend = NULL;
 576         c->c_authz_backend = NULL;
 577 }
 578
 579 static void
 580 connection_destroy( Connection *c )
 581 {
 582         /* note: connections_mutex should be locked by caller */
 583     ber_socket_t        sd;
 584
 585     assert( connections != NULL );
 586     assert( c != NULL );
 587     assert( c->c_struct_state != SLAP_C_UNUSED );
 588     assert( c->c_conn_state != SLAP_C_INVALID );
 589     assert( c->c_ops == NULL );
 590
 591     backend_connection_destroy(c);
 592
 593     c->c_protocol = 0;
 594     c->c_connid = -1;
 595
 596     c->c_activitytime = c->c_starttime = 0;
 597
 598         connection2anonymous( c );
 599
 600         if(c->c_listener_url != NULL) {
 601                 free(c->c_listener_url);
 602                 c->c_listener_url = NULL;
 603         }
 604
 605         if(c->c_peer_domain != NULL) {
 606                 free(c->c_peer_domain);
 607                 c->c_peer_domain = NULL;
 608         }
 609         if(c->c_peer_name != NULL) {
 610 #ifdef LDAP_PF_lOCAL
 611                 /*
 612                  * If peer was a domain socket, unlink. Mind you,
 613                  * they may be un-named. Should we leave this to
 614                  * the client?
 615                  */
 616                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 617                         char *path = c->c_peer_name + 5;
 618                         if (path != '\0') {
 619                                 (void)unlink(path);
 620                         }
 621                 }
 622 #endif /* LDAP_PF_LOCAL */
 623
 624                 free(c->c_peer_name);
 625                 c->c_peer_name = NULL;
 626         }
 627         if(c->c_sock_name != NULL) {
 628                 free(c->c_sock_name);
 629                 c->c_sock_name = NULL;
 630         }
 631
 632         c->c_sasl_bind_in_progress = 0;
 633         if(c->c_sasl_bind_mech != NULL) {
 634                 free(c->c_sasl_bind_mech);
 635                 c->c_sasl_bind_mech = NULL;
 636         }
 637
 638         slap_sasl_close( c );
 639
 640         if ( c->c_currentber != NULL ) {
 641                 ber_free( c->c_currentber, 1 );
 642                 c->c_currentber = NULL;
 643         }
 644
 645         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 646         if ( sd != AC_SOCKET_INVALID ) {
 647                 slapd_remove( sd, 0 );
 648
 649                 Statslog( LDAP_DEBUG_STATS,
 650                     "conn=%ld fd=%d closed\n",
 651                         c->c_connid, sd, 0, 0, 0 );
 652         }
 653
 654         ber_sockbuf_free( c->c_sb );
 655
 656         c->c_sb = ber_sockbuf_alloc( );
 657
 658         {
 659                 ber_len_t max = sockbuf_max_incoming;
 660                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 661         }
 662
 663     c->c_conn_state = SLAP_C_INVALID;
 664     c->c_struct_state = SLAP_C_UNUSED;
 665 }
 666
 667 int connection_state_closing( Connection *c )
 668 {
 669         /* c_mutex must be locked by caller */
 670
 671         int state;
 672         assert( c != NULL );
 673         assert( c->c_struct_state == SLAP_C_USED );
 674
 675         state = c->c_conn_state;
 676
 677         assert( state != SLAP_C_INVALID );
 678
 679         return state == SLAP_C_CLOSING;
 680 }
 681
 682 static void connection_abandon( Connection *c )
 683 {
 684         /* c_mutex must be locked by caller */
 685
 686         Operation *o;
 687
 688         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 689                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 690                 o->o_abandon = 1;
 691                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 692         }
 693
 694         /* remove pending operations */
 695         for( o = slap_op_pop( &c->c_pending_ops );
 696                 o != NULL;
 697                 o = slap_op_pop( &c->c_pending_ops ) )
 698         {
 699                 slap_op_free( o );
 700         }
 701 }
 702
 703 void connection_closing( Connection *c )
 704 {
 705         assert( connections != NULL );
 706         assert( c != NULL );
 707         assert( c->c_struct_state == SLAP_C_USED );
 708         assert( c->c_conn_state != SLAP_C_INVALID );
 709
 710         /* c_mutex must be locked by caller */
 711
 712         if( c->c_conn_state != SLAP_C_CLOSING ) {
 713                 ber_socket_t    sd;
 714
 715                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 716 #ifdef NEW_LOGGING
 717                 LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
 718                            "connection_closing: conn %d readying socket %d for close.\n",
 719                            c->c_connid, sd ));
 720 #else
 721                 Debug( LDAP_DEBUG_TRACE,
 722                         "connection_closing: readying conn=%ld sd=%d for close\n",
 723                         c->c_connid, sd, 0 );
 724 #endif
 725                 /* update state to closing */
 726                 c->c_conn_state = SLAP_C_CLOSING;
 727
 728                 /* don't listen on this port anymore */
 729                 slapd_clr_read( sd, 1 );
 730
 731                 /* abandon active operations */
 732                 connection_abandon( c );
 733
 734                 /* wake write blocked operations */
 735                 slapd_clr_write( sd, 1 );
 736                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 737         }
 738 }
 739
 740 static void connection_close( Connection *c )
 741 {
 742         ber_socket_t    sd;
 743
 744         assert( connections != NULL );
 745         assert( c != NULL );
 746         assert( c->c_struct_state == SLAP_C_USED );
 747         assert( c->c_conn_state == SLAP_C_CLOSING );
 748
 749         /* note: connections_mutex and c_mutex should be locked by caller */
 750
 751         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 752         if( c->c_ops != NULL ) {
 753 #ifdef NEW_LOGGING
 754                 LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
 755                            "connection_close: conn %d  deferring sd %d\n",
 756                            c->c_connid, sd ));
 757 #else
 758                 Debug( LDAP_DEBUG_TRACE,
 759                         "connection_close: deferring conn=%ld sd=%d\n",
 760                         c->c_connid, sd, 0 );
 761 #endif
 762                 return;
 763         }
 764
 765 #ifdef NEW_LOGGING
 766         LDAP_LOG(( "connection", LDAP_LEVEL_RESULTS,
 767                    "connection_close: conn %d  sd %d\n",
 768                    c->c_connid, sd ));
 769 #else
 770         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 771                 c->c_connid, sd, 0 );
 772 #endif
 773         connection_destroy( c );
 774 }
 775
 776 unsigned long connections_nextid(void)
 777 {
 778         unsigned long id;
 779         assert( connections != NULL );
 780
 781         ldap_pvt_thread_mutex_lock( &connections_mutex );
 782
 783         id = conn_nextid;
 784
 785         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 786
 787         return id;
 788 }
 789
 790 Connection* connection_first( ber_socket_t *index )
 791 {
 792         assert( connections != NULL );
 793         assert( index != NULL );
 794
 795         ldap_pvt_thread_mutex_lock( &connections_mutex );
 796
 797         *index = 0;
 798
 799         return connection_next(NULL, index);
 800 }
 801
 802 Connection* connection_next( Connection *c, ber_socket_t *index )
 803 {
 804         assert( connections != NULL );
 805         assert( index != NULL );
 806         assert( *index <= dtblsize );
 807
 808         if( c != NULL ) {
 809                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 810         }
 811
 812         c = NULL;
 813
 814         for(; *index < dtblsize; (*index)++) {
 815                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 816                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 817 #ifndef HAVE_WINSOCK
 818                         continue;
 819 #else
 820                         break;
 821 #endif
 822                 }
 823
 824                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 825                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 826                         c = &connections[(*index)++];
 827                         break;
 828                 }
 829
 830                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 831                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 832         }
 833
 834         if( c != NULL ) {
 835                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 836         }
 837
 838         return c;
 839 }
 840
 841 void connection_done( Connection *c )
 842 {
 843         assert( connections != NULL );
 844
 845         if( c != NULL ) {
 846                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 847         }
 848
 849         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 850 }
 851
 852 /*
 853  * connection_activity - handle the request operation op on connection
 854  * conn.  This routine figures out what kind of operation it is and
 855  * calls the appropriate stub to handle it.
 856  */
 857
 858 static void *
 859 connection_operation( void *arg_v )
 860 {
 861         int rc;
 862         struct co_arg   *arg = arg_v;
 863         ber_tag_t tag = arg->co_op->o_tag;
 864         Connection *conn = arg->co_conn;
 865
 866         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 867         num_ops_initiated++;
 868         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 869
 870         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 871 #ifdef NEW_LOGGING
 872                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
 873                            "connection_operation: conn %d  SASL bind in progress (tag=%ld).\n",
 874                            conn->c_connid, (long)tag ));
 875 #else
 876                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 877                         "error: SASL bind in progress (tag=%ld).\n",
 878                         (long) tag, 0, 0 );
 879 #endif
 880                 send_ldap_result( conn, arg->co_op,
 881                         rc = LDAP_OPERATIONS_ERROR,
 882                         NULL, "SASL bind in progress", NULL, NULL );
 883                 goto operations_error;
 884         }
 885
 886         switch ( tag ) {
 887         case LDAP_REQ_BIND:
 888                 rc = do_bind( conn, arg->co_op );
 889                 break;
 890
 891         case LDAP_REQ_UNBIND:
 892                 rc = do_unbind( conn, arg->co_op );
 893                 break;
 894
 895         case LDAP_REQ_ADD:
 896                 rc = do_add( conn, arg->co_op );
 897                 break;
 898
 899         case LDAP_REQ_DELETE:
 900                 rc = do_delete( conn, arg->co_op );
 901                 break;
 902
 903         case LDAP_REQ_MODRDN:
 904                 rc = do_modrdn( conn, arg->co_op );
 905                 break;
 906
 907         case LDAP_REQ_MODIFY:
 908                 rc = do_modify( conn, arg->co_op );
 909                 break;
 910
 911         case LDAP_REQ_COMPARE:
 912                 rc = do_compare( conn, arg->co_op );
 913                 break;
 914
 915         case LDAP_REQ_SEARCH:
 916                 rc = do_search( conn, arg->co_op );
 917                 break;
 918
 919         case LDAP_REQ_ABANDON:
 920                 rc = do_abandon( conn, arg->co_op );
 921                 break;
 922
 923         case LDAP_REQ_EXTENDED:
 924                 rc = do_extended( conn, arg->co_op );
 925                 break;
 926
 927         default:
 928 #ifdef NEW_LOGGING
 929                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 930                            "connection_operation: conn %d  unknown LDAP request 0x%lx\n",
 931                            conn->c_connid, tag ));
 932 #else
 933                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 934                     tag, 0, 0 );
 935 #endif
 936                 arg->co_op->o_tag = LBER_ERROR;
 937                 send_ldap_disconnect( conn, arg->co_op,
 938                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 939                 rc = -1;
 940                 break;
 941         }
 942
 943         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 944
 945 operations_error:
 946         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 947         num_ops_completed++;
 948         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 949
 950         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 951
 952         conn->c_n_ops_executing--;
 953         conn->c_n_ops_completed++;
 954
 955         slap_op_remove( &conn->c_ops, arg->co_op );
 956         slap_op_free( arg->co_op );
 957         arg->co_op = NULL;
 958         arg->co_conn = NULL;
 959         free( (char *) arg );
 960         arg = NULL;
 961
 962         switch( tag ) {
 963         case LBER_ERROR:
 964         case LDAP_REQ_UNBIND:
 965                 /* c_mutex is locked */
 966                 connection_closing( conn );
 967                 break;
 968
 969         case LDAP_REQ_BIND:
 970                 conn->c_sasl_bind_in_progress =
 971                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
 972
 973                 if( conn->c_conn_state == SLAP_C_BINDING) {
 974                         conn->c_conn_state = SLAP_C_ACTIVE;
 975                 }
 976         }
 977
 978         connection_resched( conn );
 979
 980         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 981
 982         return NULL;
 983 }
 984
 985 int connection_read(ber_socket_t s)
 986 {
 987         int rc = 0;
 988         Connection *c;
 989         assert( connections != NULL );
 990
 991         ldap_pvt_thread_mutex_lock( &connections_mutex );
 992
 993         /* get (locked) connection */
 994         c = connection_get( s );
 995
 996         if( c == NULL ) {
 997 #ifdef NEW_LOGGING
 998                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 999                            "connection_read: sock %ld no connection\n",
1000                            (long)s ));
1001 #else
1002                 Debug( LDAP_DEBUG_ANY,
1003                         "connection_read(%ld): no connection!\n",
1004                         (long) s, 0, 0 );
1005 #endif
1006                 slapd_remove(s, 0);
1007
1008                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1009                 return -1;
1010         }
1011
1012         c->c_n_read++;
1013
1014         if( c->c_conn_state == SLAP_C_CLOSING ) {
1015 #ifdef NEW_LOGGING
1016                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1017                            "connection_read: conn %d connection closing, ignoring input\n",
1018                            c->c_connid));
1019 #else
1020                 Debug( LDAP_DEBUG_TRACE,
1021                         "connection_read(%d): closing, ignoring input for id=%ld\n",
1022                         s, c->c_connid, 0 );
1023 #endif
1024                 connection_return( c );
1025                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1026                 return 0;
1027         }
1028
1029 #ifdef NEW_LOGGING
1030         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1031                    "connection_read: conn %d  checking for input.\n", c->c_connid ));
1032 #else
1033         Debug( LDAP_DEBUG_TRACE,
1034                 "connection_read(%d): checking for input on id=%ld\n",
1035                 s, c->c_connid, 0 );
1036 #endif
1037
1038 #ifdef HAVE_TLS
1039         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1040                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
1041                 if ( rc < 0 ) {
1042                         struct timeval tv;
1043                         fd_set rfd;
1044
1045 #ifdef NEW_LOGGING
1046                         LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1047                                    "connection_read: conn %d  TLS accept error, error %d\n",
1048                                    c->c_connid, rc ));
1049 #else
1050                         Debug( LDAP_DEBUG_TRACE,
1051                                 "connection_read(%d): TLS accept error "
1052                                 "error=%d id=%ld, closing\n",
1053                                 s, rc, c->c_connid );
1054 #endif
1055                         c->c_needs_tls_accept = 0;
1056                         /* connections_mutex and c_mutex are locked */
1057                         connection_closing( c );
1058
1059 #if 0
1060                         /* Drain input before close, to allow SSL error codes
1061                          * to propagate to client. */
1062                         FD_ZERO(&rfd);
1063                         FD_SET(s, &rfd);
1064                         for (rc=1; rc>0;)
1065                         {
1066                             tv.tv_sec = 1;
1067                             tv.tv_usec = 0;
1068                             rc = select(s+1, &rfd, NULL, NULL, &tv);
1069                             if (rc == 1)
1070                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN,
1071                                     NULL);
1072                         }
1073 #endif
1074                         connection_close( c );
1075
1076                 } else if ( rc == 0 ) {
1077                         void *ssl;
1078                         char *authid;
1079
1080                         c->c_needs_tls_accept = 0;
1081
1082                         /* we need to let SASL know */
1083                         ssl = (void *)ldap_pvt_tls_sb_ctx( c->c_sb );
1084
1085                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1086                         if( c->c_tls_ssf > c->c_ssf ) {
1087                                 c->c_ssf = c->c_tls_ssf;
1088                         }
1089
1090                         authid = (char *)ldap_pvt_tls_get_peer( ssl );
1091                         slap_sasl_external( c, c->c_tls_ssf, authid );
1092                 }
1093                 connection_return( c );
1094                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1095                 return 0;
1096         }
1097 #endif
1098
1099 #ifdef HAVE_CYRUS_SASL
1100         if ( c->c_sasl_layers ) {
1101                 c->c_sasl_layers = 0;
1102
1103                 rc = ldap_pvt_sasl_install( c->c_sb,  c->c_sasl_context );
1104
1105                 if( rc != LDAP_SUCCESS ) {
1106 #ifdef NEW_LOGGING
1107                         LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1108                                    "connection_read: conn %d SASL install error %d, closing\n",
1109                                    c->c_connid, rc ));
1110 #else
1111                         Debug( LDAP_DEBUG_TRACE,
1112                                 "connection_read(%d): SASL install error "
1113                                 "error=%d id=%ld, closing\n",
1114                                 s, rc, c->c_connid );
1115 #endif
1116                         /* connections_mutex and c_mutex are locked */
1117                         connection_closing( c );
1118                         connection_close( c );
1119                         connection_return( c );
1120                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1121                         return 0;
1122                 }
1123         }
1124 #endif
1125
1126 #define CONNECTION_INPUT_LOOP 1
1127
1128 #ifdef DATA_READY_LOOP
1129         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_DATA_READY, NULL ) )
1130 #elif CONNECTION_INPUT_LOOP
1131         while(!rc)
1132 #endif
1133         {
1134                 /* How do we do this without getting into a busy loop ? */
1135                 rc = connection_input( c );
1136         }
1137
1138         if( rc < 0 ) {
1139 #ifdef NEW_LOGGING
1140                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1141                            "connection_read: conn %d  input error %d, closing.\n",
1142                            c->c_connid, rc ));
1143 #else
1144                 Debug( LDAP_DEBUG_TRACE,
1145                         "connection_read(%d): input error=%d id=%ld, closing.\n",
1146                         s, rc, c->c_connid );
1147 #endif
1148                 /* connections_mutex and c_mutex are locked */
1149                 connection_closing( c );
1150                 connection_close( c );
1151                 connection_return( c );
1152                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1153                 return 0;
1154         }
1155
1156         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1157                 slapd_set_read( s, 1 );
1158         }
1159
1160         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1161                 slapd_set_write( s, 1 );
1162         }
1163
1164         connection_return( c );
1165         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1166         return 0;
1167 }
1168
1169 static int
1170 connection_input(
1171     Connection *conn
1172 )
1173 {
1174         Operation *op;
1175         ber_tag_t       tag;
1176         ber_len_t       len;
1177         ber_int_t       msgid;
1178         BerElement      *ber;
1179 #ifdef LDAP_CONNECTIONLESS
1180         Sockaddr        peeraddr;
1181         char            *cdn = NULL;
1182 #endif
1183
1184         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
1185             == NULL ) {
1186 #ifdef NEW_LOGGING
1187                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1188                            "connection_input: conn %d  ber_alloc failed.\n", conn->c_connid ));
1189 #else
1190                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1191 #endif
1192                 return -1;
1193         }
1194
1195         errno = 0;
1196
1197 #ifdef LDAP_CONNECTIONLESS
1198         if (conn->c_is_udp)
1199         {
1200                 char    peername[sizeof("IP=255.255.255.255:65336")];
1201                 len = ber_int_sb_read(conn->c_sb, &peeraddr,
1202                         sizeof(struct sockaddr));
1203                 sprintf( peername, "IP=%s:%d",
1204                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1205                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1206                 Statslog( LDAP_DEBUG_STATS,
1207                             "conn=%ld UDP request from %s (%s) accepted.\n",
1208                             conn->c_connid, peername,
1209                             conn->c_sock_name, 0, 0 );
1210         }
1211 #endif
1212         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1213         if ( tag != LDAP_TAG_MESSAGE ) {
1214                 int err = errno;
1215                 ber_socket_t    sd;
1216
1217                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1218
1219 #ifdef NEW_LOGGING
1220                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1221                            "connection_input: conn %d  ber_get_next failed, errno %d (%s).\n",
1222                            conn->c_connid, err, sock_errstr(err) ));
1223 #else
1224                 Debug( LDAP_DEBUG_TRACE,
1225                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1226                         sd, err, sock_errstr(err) );
1227 #endif
1228                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1229                         /* log, close and send error */
1230                         ber_free( conn->c_currentber, 1 );
1231                         conn->c_currentber = NULL;
1232
1233                         return -2;
1234                 }
1235                 return 1;
1236         }
1237
1238         ber = conn->c_currentber;
1239         conn->c_currentber = NULL;
1240
1241         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1242                 /* log, close and send error */
1243 #ifdef NEW_LOGGING
1244                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1245                            "connection_input: conn %d  ber_get_int returns 0x%lx.\n",
1246                            conn->c_connid, tag ));
1247 #else
1248                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
1249                     0 );
1250 #endif
1251                 ber_free( ber, 1 );
1252                 return -1;
1253         }
1254 #ifdef LDAP_CONNECTIONLESS
1255         if (conn->c_is_udp) {
1256                 tag = ber_get_stringa( ber, &cdn );
1257         }
1258 #endif
1259
1260         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1261                 /* log, close and send error */
1262 #ifdef NEW_LOGGING
1263                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1264                            "connection_input: conn %d  ber_peek_tag returns 0x%lx.\n",
1265                            conn->c_connid, tag ));
1266 #else
1267                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
1268                     0 );
1269 #endif
1270                 ber_free( ber, 1 );
1271
1272                 return -1;
1273         }
1274
1275 #ifdef LDAP_CONNECTIONLESS
1276         if (conn->c_is_udp && (tag != LDAP_REQ_ABANDON &&
1277                 tag != LDAP_REQ_SEARCH))
1278         {
1279 #ifdef NEW_LOGGING
1280                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1281                            "connection_input: conn %d  invalid req for UDP 0x%lx.\n",
1282                            conn->c_connid, tag ));
1283 #else
1284                 Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0,
1285                     0 );
1286 #endif
1287                 ber_free( ber, 1 );
1288                 return 0;
1289         }
1290 #endif
1291         if(tag == LDAP_REQ_BIND) {
1292                 /* immediately abandon all exiting operations upon BIND */
1293                 connection_abandon( conn );
1294         }
1295
1296         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1297
1298 #ifdef LDAP_CONNECTIONLESS
1299         op->o_peeraddr = peeraddr;
1300         op->o_dn = cdn;
1301 #endif
1302         if ( conn->c_conn_state == SLAP_C_BINDING
1303                 || conn->c_conn_state == SLAP_C_CLOSING )
1304         {
1305 #ifdef NEW_LOGGING
1306                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1307                            "connection_input: conn %d  deferring operation\n",
1308                            conn->c_connid ));
1309 #else
1310                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1311 #endif
1312                 conn->c_n_ops_pending++;
1313                 slap_op_add( &conn->c_pending_ops, op );
1314
1315         } else {
1316                 conn->c_n_ops_executing++;
1317                 connection_op_activate( conn, op );
1318         }
1319
1320 #ifdef NO_THREADS
1321         if ( conn->c_struct_state != SLAP_C_USED ) {
1322                 /* connection must have got closed underneath us */
1323                 return 1;
1324         }
1325 #endif
1326         assert( conn->c_struct_state == SLAP_C_USED );
1327
1328         return 0;
1329 }
1330
1331 static int
1332 connection_resched( Connection *conn )
1333 {
1334         Operation *op;
1335
1336         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1337                 int rc;
1338                 ber_socket_t    sd;
1339                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1340
1341                 /* us trylock to avoid possible deadlock */
1342                 rc = ldap_pvt_thread_mutex_trylock( &connections_mutex );
1343
1344                 if( rc ) {
1345 #ifdef NEW_LOGGING
1346                         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1347                                    "connection_resched: conn %d  reaquiring locks.\n",
1348                                    conn->c_connid ));
1349 #else
1350                         Debug( LDAP_DEBUG_TRACE,
1351                                 "connection_resched: reaquiring locks conn=%ld sd=%d\n",
1352                                 conn->c_connid, sd, 0 );
1353 #endif
1354                         /*
1355                          * reaquire locks in the right order...
1356                          * this may allow another thread to close this connection,
1357                          * so recheck state below.
1358                          */
1359                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1360                         ldap_pvt_thread_mutex_lock( &connections_mutex );
1361                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1362                 }
1363
1364                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1365 #ifdef NEW_LOGGING
1366                         LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1367                                    "connection_resched: conn %d  closed by other thread.\n",
1368                                    conn->c_connid ));
1369 #else
1370                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1371                                 "closed by other thread conn=%ld sd=%d\n",
1372                                 conn->c_connid, sd, 0 );
1373 #endif
1374                 } else {
1375 #ifdef NEW_LOGGING
1376                         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1377                                    "connection_resched: conn %d  attempting closing.\n",
1378                                    conn->c_connid ));
1379 #else
1380                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1381                                 "attempting closing conn=%ld sd=%d\n",
1382                                 conn->c_connid, sd, 0 );
1383 #endif
1384                         connection_close( conn );
1385                 }
1386
1387                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1388                 return 0;
1389         }
1390
1391         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1392                 /* other states need different handling */
1393                 return 0;
1394         }
1395
1396         for( op = slap_op_pop( &conn->c_pending_ops );
1397                 op != NULL;
1398                 op = slap_op_pop( &conn->c_pending_ops ) )
1399         {
1400                 /* pending operations should not be marked for abandonment */
1401                 assert(!op->o_abandon);
1402
1403                 conn->c_n_ops_pending--;
1404                 conn->c_n_ops_executing++;
1405
1406                 connection_op_activate( conn, op );
1407
1408                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1409                         break;
1410                 }
1411         }
1412         return 0;
1413 }
1414
1415 static int connection_op_activate( Connection *conn, Operation *op )
1416 {
1417         struct co_arg *arg;
1418         int status;
1419         ber_tag_t tag = op->o_tag;
1420
1421         if(tag == LDAP_REQ_BIND) {
1422                 conn->c_conn_state = SLAP_C_BINDING;
1423         }
1424
1425         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1426         arg->co_conn = conn;
1427         arg->co_op = op;
1428
1429         if (!arg->co_op->o_dn) {
1430             arg->co_op->o_authz = conn->c_authz;
1431             arg->co_op->o_dn = ch_strdup( conn->c_dn != NULL ? conn->c_dn : "" );
1432         }
1433         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1434         (void) dn_normalize( arg->co_op->o_ndn );
1435         arg->co_op->o_authtype = conn->c_authtype;
1436         arg->co_op->o_authmech = conn->c_authmech != NULL
1437                 ?  ch_strdup( conn->c_authmech ) : NULL;
1438
1439         arg->co_op->o_protocol = conn->c_protocol
1440                 ? conn->c_protocol : LDAP_VERSION3;
1441         arg->co_op->o_connid = conn->c_connid;
1442
1443         slap_op_add( &conn->c_ops, arg->co_op );
1444
1445         status = ldap_pvt_thread_pool_submit( &connection_pool,
1446                 connection_operation, (void *) arg );
1447
1448         if ( status != 0 ) {
1449 #ifdef NEW_LOGGING
1450                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1451                            "connection_op_activate: conn %d      thread pool submit failed.\n",
1452                            conn->c_connid ));
1453 #else
1454                 Debug( LDAP_DEBUG_ANY,
1455                 "ldap_pvt_thread_pool_submit failed (%d)\n", status, 0, 0 );
1456 #endif
1457                 /* should move op to pending list */
1458         }
1459
1460         return status;
1461 }
1462
1463 int connection_write(ber_socket_t s)
1464 {
1465         Connection *c;
1466         assert( connections != NULL );
1467
1468         ldap_pvt_thread_mutex_lock( &connections_mutex );
1469
1470         c = connection_get( s );
1471
1472         slapd_clr_write( s, 0);
1473
1474         if( c == NULL ) {
1475 #ifdef NEW_LOGGING
1476                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1477                            "connection_write: sock %ld  no connection!\n",(long)s));
1478 #else
1479                 Debug( LDAP_DEBUG_ANY,
1480                         "connection_write(%ld): no connection!\n",
1481                         (long) s, 0, 0 );
1482 #endif
1483                 slapd_remove(s, 0);
1484                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1485                 return -1;
1486         }
1487
1488         c->c_n_write++;
1489
1490 #ifdef NEW_LOGGING
1491         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1492                    "connection_write conn %d  waking output.\n",
1493                    c->c_connid ));
1494 #else
1495         Debug( LDAP_DEBUG_TRACE,
1496                 "connection_write(%d): waking output for id=%ld\n",
1497                 s, c->c_connid, 0 );
1498 #endif
1499         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1500
1501         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
1502                 slapd_set_read( s, 1 );
1503         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
1504                 slapd_set_write( s, 1 );
1505         connection_return( c );
1506         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1507         return 0;
1508 }
1509
1510
1511 /*
1512  * Create client side and server side connection structures, connected to
1513  * one another, for the front end to use for searches on arbitrary back ends.
1514  */
1515
1516 int connection_internal_open( Connection **conn, LDAP **ldp, const char *id )
1517 {
1518         int rc;
1519         ber_socket_t fd[2] = {-1,-1};
1520         Operation *op;
1521
1522         *conn=NULL;
1523         *ldp=NULL;
1524
1525         rc = lutil_pair( fd );
1526         if( rc == -1 ) {
1527                 return LDAP_OTHER;
1528         }
1529
1530         rc = connection_init( fd[1], "INT", "localhost",
1531       "localhost:0", "localhost:00", 0, 256, id );
1532         if( rc < 0 ) {
1533                 tcp_close( fd[0] );
1534                 tcp_close( fd[1] );
1535                 return LDAP_OTHER;
1536         }
1537         slapd_add_internal( fd[1] );
1538
1539         /* A search operation, number 0 */
1540         op = slap_op_alloc( NULL, 0, LDAP_REQ_SEARCH, 0);
1541         op->o_ndn = ch_strdup( id );
1542         op->o_protocol = LDAP_VERSION3;
1543
1544         (*conn) = connection_get( fd[1] );
1545         (*conn)->c_ops = op;
1546     (*conn)->c_conn_state = SLAP_C_ACTIVE;
1547
1548
1549         /* Create the client side of the connection */
1550         rc = ldap_open_internal_connection( ldp, &(fd[0]) );
1551         if( rc != LDAP_SUCCESS ) {
1552                 tcp_close( fd[0] );
1553                 return LDAP_OTHER;
1554         }
1555
1556         /* The connection_get() will have locked the connection's mutex */
1557         ldap_pvt_thread_mutex_unlock(  &((*conn)->c_mutex) );
1558
1559         return LDAP_SUCCESS;
1560 }
1561
1562
1563 void connection_internal_close( Connection *conn )
1564 {
1565         Operation *op = conn->c_ops;
1566
1567         slap_op_remove( &conn->c_ops, op );
1568         slap_op_free( op );
1569         connection_closing( conn );
1570         connection_close( conn );
1571 }