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

   1 #include "portable.h"
   2
   3 #include <stdio.h>
   4
   5 #include <ac/socket.h>
   6 #include <ac/errno.h>
   7 #include <ac/signal.h>
   8 #include <ac/string.h>
   9 #include <ac/time.h>
  10
  11 #include "slap.h"
  12
  13 /* we need LBER internals */
  14 #include "../../libraries/liblber/lber-int.h"
  15
  16 /* protected by connections_mutex */
  17 static ldap_pvt_thread_mutex_t connections_mutex;
  18 static Connection *connections = NULL;
  19 static unsigned long conn_nextid = 0;
  20
  21 /* structure state (protected by connections_mutex) */
  22 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  23 #define SLAP_C_UNUSED                   0x01
  24 #define SLAP_C_USED                             0x02
  25
  26 /* connection state (protected by c_mutex ) */
  27 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  28 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  29 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  30 #define SLAP_C_BINDING                  0x03    /* binding */
  31 #define SLAP_C_CLOSING                  0x04    /* closing */
  32
  33 static Connection* connection_get( ber_socket_t s );
  34
  35 static int connection_input( Connection *c );
  36 static void connection_close( Connection *c );
  37
  38 static int connection_op_activate( Connection *conn, Operation *op );
  39 static int connection_resched( Connection *conn );
  40
  41 struct co_arg {
  42         Connection      *co_conn;
  43         Operation       *co_op;
  44 };
  45
  46 /*
  47  * Initialize connection management infrastructure.
  48  */
  49 int connections_init(void)
  50 {
  51         assert( connections == NULL );
  52
  53         if( connections != NULL) {
  54                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  55                         0, 0, 0 );
  56                 return -1;
  57         }
  58
  59         /* should check return of every call */
  60         ldap_pvt_thread_mutex_init( &connections_mutex );
  61
  62         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  63
  64         if( connections == NULL ) {
  65                 Debug( LDAP_DEBUG_ANY,
  66                         "connections_init: allocation (%d*%ld) of connection array failed.\n",
  67                         dtblsize, (long) sizeof(Connection), 0 );
  68                 return -1;
  69         }
  70
  71     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  72     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  73
  74         /*
  75          * per entry initialization of the Connection array initialization
  76          * will be done by connection_init()
  77          */
  78
  79         return 0;
  80 }
  81
  82 /*
  83  * Destroy connection management infrastructure.
  84  */
  85 int connections_destroy(void)
  86 {
  87         ber_socket_t i;
  88
  89         /* should check return of every call */
  90
  91         if( connections == NULL) {
  92                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
  93                         0, 0, 0 );
  94                 return -1;
  95         }
  96
  97         for ( i = 0; i < dtblsize; i++ ) {
  98                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
  99                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 100                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 101                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 102                 }
 103         }
 104
 105         free( connections );
 106         connections = NULL;
 107
 108         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 109         return 0;
 110 }
 111
 112 /*
 113  * shutdown all connections
 114  */
 115 int connections_shutdown(void)
 116 {
 117         ber_socket_t i;
 118
 119         ldap_pvt_thread_mutex_lock( &connections_mutex );
 120
 121         for ( i = 0; i < dtblsize; i++ ) {
 122                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 123                         continue;
 124                 }
 125
 126                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 127
 128                 /* connections_mutex and c_mutex are locked */
 129                 connection_closing( &connections[i] );
 130                 connection_close( &connections[i] );
 131
 132                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 133         }
 134
 135         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 136
 137         return 0;
 138 }
 139
 140 /*
 141  * Timeout idle connections.
 142  */
 143 int connections_timeout_idle(time_t now)
 144 {
 145         int i = 0;
 146         int connindex;
 147         Connection* c;
 148
 149         ldap_pvt_thread_mutex_lock( &connections_mutex );
 150
 151         for( c = connection_first( &connindex );
 152                 c != NULL;
 153                 c = connection_next( c, &connindex ) )
 154         {
 155                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 156                         /* close it */
 157                         connection_closing( c );
 158                         connection_close( c );
 159                         i++;
 160                 }
 161         }
 162         connection_done( c );
 163
 164         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 165
 166         return i;
 167 }
 168
 169 static Connection* connection_get( ber_socket_t s )
 170 {
 171         /* connections_mutex should be locked by caller */
 172
 173         Connection *c;
 174
 175         Debug( LDAP_DEBUG_ARGS,
 176                 "connection_get(%ld)\n",
 177                 (long) s, 0, 0 );
 178
 179         assert( connections != NULL );
 180
 181         if(s == AC_SOCKET_INVALID) {
 182                 return NULL;
 183         }
 184
 185 #ifndef HAVE_WINSOCK
 186         c = &connections[s];
 187
 188         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 189
 190 #else
 191         c = NULL;
 192         {
 193                 ber_socket_t i;
 194
 195                 for(i=0; i<dtblsize; i++) {
 196                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 197                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 198                                 assert( connections[i].c_sb == 0 );
 199                                 break;
 200                         }
 201
 202                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 203                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 204                                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ) );
 205                                 continue;
 206                         }
 207
 208                         /* state can actually change from used -> unused by resched,
 209                          * so don't assert details here.
 210                          */
 211
 212                         if( ber_pvt_sb_get_desc( connections[i].c_sb ) == s ) {
 213                                 c = &connections[i];
 214                                 break;
 215                         }
 216                 }
 217         }
 218 #endif
 219
 220         if( c != NULL ) {
 221                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 222
 223                 if( c->c_struct_state != SLAP_C_USED ) {
 224                         /* connection must have been closed due to resched */
 225
 226                         assert( c->c_conn_state == SLAP_C_INVALID );
 227                         assert( !ber_pvt_sb_in_use( c->c_sb ) );
 228
 229                         Debug( LDAP_DEBUG_TRACE,
 230                                 "connection_get(%d): connection not used.\n",
 231                                 s, c->c_connid, 0 );
 232
 233                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 234                         return NULL;
 235                 }
 236
 237                 Debug( LDAP_DEBUG_TRACE,
 238                         "connection_get(%d): got connid=%ld\n",
 239                         s, c->c_connid, 0 );
 240
 241                 assert( c->c_struct_state == SLAP_C_USED );
 242                 assert( c->c_conn_state != SLAP_C_INVALID );
 243                 assert( ber_pvt_sb_in_use( c->c_sb ) );
 244
 245         c->c_activitytime = slap_get_time();
 246         }
 247
 248         return c;
 249 }
 250
 251 static void connection_return( Connection *c )
 252 {
 253         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 254 }
 255
 256 long connection_init(
 257         ber_socket_t s,
 258         const char* name,
 259         const char* addr)
 260 {
 261         unsigned long id;
 262         Connection *c;
 263         assert( connections != NULL );
 264
 265         if( s == AC_SOCKET_INVALID ) {
 266         Debug( LDAP_DEBUG_ANY,
 267                         "connection_init(%ld): invalid.\n",
 268                         (long) s, 0, 0 );
 269                 return -1;
 270         }
 271
 272         assert( s >= 0 );
 273 #ifndef HAVE_WINSOCK
 274         assert( s < dtblsize );
 275 #endif
 276
 277         ldap_pvt_thread_mutex_lock( &connections_mutex );
 278
 279 #ifndef HAVE_WINSOCK
 280         c = &connections[s];
 281
 282 #else
 283         {
 284                 unsigned int i;
 285
 286                 c = NULL;
 287
 288         for( i=0; i < dtblsize; i++) {
 289             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 290                 assert( connections[i].c_sb == 0 );
 291                 c = &connections[i];
 292                 break;
 293             }
 294
 295             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 296                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
 297                 c = &connections[i];
 298                 break;
 299             }
 300
 301             assert( connections[i].c_struct_state == SLAP_C_USED );
 302             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 303             assert( ber_pvt_sb_in_use( connections[i].c_sb ));
 304         }
 305
 306         if( c == NULL ) {
 307                 Debug( LDAP_DEBUG_ANY,
 308                                 "connection_init(%d): connection table full (%d/%d).\n",
 309                                 s, i, dtblsize);
 310             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 311             return -1;
 312         }
 313     }
 314 #endif
 315
 316     assert( c != NULL );
 317     assert( c->c_struct_state != SLAP_C_USED );
 318     assert( c->c_conn_state == SLAP_C_INVALID );
 319
 320     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 321         c->c_dn = NULL;
 322         c->c_cdn = NULL;
 323         c->c_client_name = NULL;
 324         c->c_client_addr = NULL;
 325         c->c_ops = NULL;
 326         c->c_pending_ops = NULL;
 327
 328         c->c_sb = ber_sockbuf_alloc( );
 329
 330         /* should check status of thread calls */
 331         ldap_pvt_thread_mutex_init( &c->c_mutex );
 332         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 333         ldap_pvt_thread_cond_init( &c->c_write_cv );
 334
 335         c->c_struct_state = SLAP_C_UNUSED;
 336     }
 337
 338     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 339
 340     assert( c->c_struct_state == SLAP_C_UNUSED );
 341     assert(     c->c_dn == NULL );
 342     assert(     c->c_cdn == NULL );
 343     assert( c->c_client_name == NULL );
 344     assert( c->c_client_addr == NULL );
 345     assert( c->c_ops == NULL );
 346     assert( c->c_pending_ops == NULL );
 347
 348     c->c_client_name = ch_strdup( name == NULL ? "" : name );
 349     c->c_client_addr = ch_strdup( addr );
 350
 351     c->c_n_ops_received = 0;
 352 #ifdef LDAP_COUNTERS
 353     c->c_n_ops_executing = 0;
 354     c->c_n_ops_pending = 0;
 355     c->c_n_ops_completed = 0;
 356 #endif
 357
 358     c->c_activitytime = c->c_starttime = slap_get_time();
 359
 360     ber_pvt_sb_set_desc( c->c_sb, s );
 361     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 362
 363     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 364         Debug( LDAP_DEBUG_ANY,
 365             "connection_init(%d, %s, %s): set nonblocking failed\n",
 366             s, c->c_client_name, c->c_client_addr);
 367     }
 368
 369     id = c->c_connid = conn_nextid++;
 370
 371     c->c_conn_state = SLAP_C_INACTIVE;
 372     c->c_struct_state = SLAP_C_USED;
 373
 374     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 375     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 376
 377     backend_connection_init(c);
 378
 379     return id;
 380 }
 381
 382 static void
 383 connection_destroy( Connection *c )
 384 {
 385         /* note: connections_mutex should be locked by caller */
 386
 387     assert( connections != NULL );
 388     assert( c != NULL );
 389     assert( c->c_struct_state != SLAP_C_UNUSED );
 390     assert( c->c_conn_state != SLAP_C_INVALID );
 391     assert( c->c_ops == NULL );
 392
 393     backend_connection_destroy(c);
 394
 395 #ifdef LDAP_COMPAT30
 396     c->c_version = 0;
 397 #endif
 398     c->c_protocol = 0;
 399
 400     c->c_activitytime = c->c_starttime = 0;
 401
 402     if(c->c_dn != NULL) {
 403         free(c->c_dn);
 404         c->c_dn = NULL;
 405     }
 406         if(c->c_cdn != NULL) {
 407                 free(c->c_cdn);
 408                 c->c_cdn = NULL;
 409         }
 410         if(c->c_client_name != NULL) {
 411                 free(c->c_client_name);
 412                 c->c_client_name = NULL;
 413         }
 414         if(c->c_client_addr != NULL) {
 415                 free(c->c_client_addr);
 416                 c->c_client_addr = NULL;
 417         }
 418
 419         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 420                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 421
 422                 slapd_remove( sd, 0 );
 423                 ber_pvt_sb_close( c->c_sb );
 424
 425                 Statslog( LDAP_DEBUG_STATS,
 426                     "conn=%d fd=%d closed.\n",
 427                         c->c_connid, sd, 0, 0, 0 );
 428         }
 429
 430         ber_pvt_sb_destroy( c->c_sb );
 431
 432     c->c_conn_state = SLAP_C_INVALID;
 433     c->c_struct_state = SLAP_C_UNUSED;
 434 }
 435
 436 int connection_state_closing( Connection *c )
 437 {
 438         /* c_mutex must be locked by caller */
 439
 440         int state;
 441         assert( c != NULL );
 442         assert( c->c_struct_state == SLAP_C_USED );
 443
 444         state = c->c_conn_state;
 445
 446         assert( state != SLAP_C_INVALID );
 447
 448         return state == SLAP_C_CLOSING;
 449 }
 450
 451 void connection_closing( Connection *c )
 452 {
 453         assert( connections != NULL );
 454         assert( c != NULL );
 455         assert( c->c_struct_state == SLAP_C_USED );
 456         assert( c->c_conn_state != SLAP_C_INVALID );
 457
 458         /* c_mutex must be locked by caller */
 459
 460         if( c->c_conn_state != SLAP_C_CLOSING ) {
 461                 Operation *o;
 462
 463                 Debug( LDAP_DEBUG_TRACE,
 464                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 465                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 466
 467                 /* update state to closing */
 468                 c->c_conn_state = SLAP_C_CLOSING;
 469
 470                 /* don't listen on this port anymore */
 471                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 472
 473                 /* shutdown I/O -- not yet implemented */
 474
 475                 /* abandon active operations */
 476                 for( o = c->c_ops; o != NULL; o = o->o_next ) {
 477                         ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 478                         o->o_abandon = 1;
 479                         ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 480                 }
 481
 482                 /* remove pending operations */
 483                 for( o = slap_op_pop( &c->c_pending_ops );
 484                         o != NULL;
 485                         o = slap_op_pop( &c->c_pending_ops ) )
 486                 {
 487                         slap_op_free( o );
 488                 }
 489
 490                 /* wake write blocked operations */
 491                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 492                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 493         }
 494 }
 495
 496 static void connection_close( Connection *c )
 497 {
 498         assert( connections != NULL );
 499         assert( c != NULL );
 500         assert( c->c_struct_state == SLAP_C_USED );
 501         assert( c->c_conn_state == SLAP_C_CLOSING );
 502
 503         /* note: connections_mutex and c_mutex should be locked by caller */
 504
 505         if( c->c_ops != NULL ) {
 506                 Debug( LDAP_DEBUG_TRACE,
 507                         "connection_close: deferring conn=%ld sd=%d.\n",
 508                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 509
 510                 return;
 511         }
 512
 513         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 514                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 515
 516         connection_destroy( c );
 517 }
 518
 519 unsigned long connections_nextid(void)
 520 {
 521         unsigned long id;
 522         assert( connections != NULL );
 523
 524         ldap_pvt_thread_mutex_lock( &connections_mutex );
 525
 526         id = conn_nextid;
 527
 528         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 529
 530         return id;
 531 }
 532
 533 Connection* connection_first( ber_socket_t *index )
 534 {
 535         assert( connections != NULL );
 536         assert( index != NULL );
 537
 538         ldap_pvt_thread_mutex_lock( &connections_mutex );
 539
 540         *index = 0;
 541
 542         return connection_next(NULL, index);
 543 }
 544
 545 Connection* connection_next( Connection *c, ber_socket_t *index )
 546 {
 547         assert( connections != NULL );
 548         assert( index != NULL );
 549         assert( *index <= dtblsize );
 550
 551         if( c != NULL ) {
 552                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 553         }
 554
 555         c = NULL;
 556
 557         for(; *index < dtblsize; (*index)++) {
 558                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 559                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 560 #ifndef HAVE_WINSOCK
 561                         continue;
 562 #else
 563                         break;
 564 #endif
 565                 }
 566
 567                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 568                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 569                         c = &connections[(*index)++];
 570                         break;
 571                 }
 572
 573                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 574                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 575         }
 576
 577         if( c != NULL ) {
 578                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 579         }
 580
 581         return c;
 582 }
 583
 584 void connection_done( Connection *c )
 585 {
 586         assert( connections != NULL );
 587
 588         if( c != NULL ) {
 589                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 590         }
 591
 592         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 593 }
 594
 595 /*
 596  * connection_activity - handle the request operation op on connection
 597  * conn.  This routine figures out what kind of operation it is and
 598  * calls the appropriate stub to handle it.
 599  */
 600
 601 static void *
 602 connection_operation( void *arg_v )
 603 {
 604         struct co_arg   *arg = arg_v;
 605         ber_tag_t tag = arg->co_op->o_tag;
 606         Connection *conn = arg->co_conn;
 607
 608 #ifdef LDAP_COUNTERS
 609         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 610         num_ops_initiated++;
 611         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 612 #endif
 613
 614         switch ( tag ) {
 615         case LDAP_REQ_BIND:
 616                 do_bind( conn, arg->co_op );
 617                 break;
 618
 619 #ifdef LDAP_COMPAT30
 620         case LDAP_REQ_UNBIND_30:
 621 #endif
 622         case LDAP_REQ_UNBIND:
 623                 do_unbind( conn, arg->co_op );
 624                 break;
 625
 626         case LDAP_REQ_ADD:
 627                 do_add( conn, arg->co_op );
 628                 break;
 629
 630 #ifdef LDAP_COMPAT30
 631         case LDAP_REQ_DELETE_30:
 632 #endif
 633         case LDAP_REQ_DELETE:
 634                 do_delete( conn, arg->co_op );
 635                 break;
 636
 637         case LDAP_REQ_MODRDN:
 638                 do_modrdn( conn, arg->co_op );
 639                 break;
 640
 641         case LDAP_REQ_MODIFY:
 642                 do_modify( conn, arg->co_op );
 643                 break;
 644
 645         case LDAP_REQ_COMPARE:
 646                 do_compare( conn, arg->co_op );
 647                 break;
 648
 649         case LDAP_REQ_SEARCH:
 650                 do_search( conn, arg->co_op );
 651                 break;
 652
 653 #ifdef LDAP_COMPAT30
 654         case LDAP_REQ_ABANDON_30:
 655 #endif
 656         case LDAP_REQ_ABANDON:
 657                 do_abandon( conn, arg->co_op );
 658                 break;
 659
 660         default:
 661                 Debug( LDAP_DEBUG_ANY, "unknown request 0x%lx\n",
 662                     arg->co_op->o_tag, 0, 0 );
 663                 break;
 664         }
 665
 666 #ifdef LDAP_COUNTERS
 667         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 668         num_ops_completed++;
 669         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 670 #endif
 671
 672         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 673
 674 #ifdef LDAP_COUNTERS
 675         conn->c_n_ops_completed++;
 676 #endif
 677
 678         slap_op_remove( &conn->c_ops, arg->co_op );
 679         slap_op_free( arg->co_op );
 680         arg->co_op = NULL;
 681         arg->co_conn = NULL;
 682         free( (char *) arg );
 683         arg = NULL;
 684
 685         switch( tag ) {
 686 #ifdef LDAP_COMPAT30
 687         case LDAP_REQ_UNBIND_30:
 688 #endif
 689         case LDAP_REQ_UNBIND:
 690                 /* c_mutex is locked */
 691                 connection_closing( conn );
 692                 break;
 693
 694         case LDAP_REQ_BIND:
 695                 if( conn->c_conn_state == SLAP_C_BINDING) {
 696                         conn->c_conn_state = SLAP_C_ACTIVE;
 697                 }
 698         }
 699
 700         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 701         active_threads--;
 702         if( active_threads < 1 ) {
 703                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 704         }
 705         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 706
 707         connection_resched( conn );
 708
 709         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 710
 711         return NULL;
 712 }
 713
 714 int connection_read(ber_socket_t s)
 715 {
 716         int rc = 0;
 717         Connection *c;
 718         assert( connections != NULL );
 719
 720         ldap_pvt_thread_mutex_lock( &connections_mutex );
 721
 722         /* get (locked) connection */
 723         c = connection_get( s );
 724
 725         if( c == NULL ) {
 726                 Debug( LDAP_DEBUG_ANY,
 727                         "connection_read(%ld): no connection!\n",
 728                         (long) s, 0, 0 );
 729
 730                 slapd_remove(s, 0);
 731
 732                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 733                 return -1;
 734         }
 735
 736         if( c->c_conn_state == SLAP_C_CLOSING ) {
 737                 Debug( LDAP_DEBUG_TRACE,
 738                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 739                         s, c->c_connid, 0 );
 740
 741                 connection_return( c );
 742                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 743                 return 0;
 744         }
 745
 746         Debug( LDAP_DEBUG_TRACE,
 747                 "connection_read(%d): checking for input on id=%ld\n",
 748                 s, c->c_connid, 0 );
 749
 750 #define CONNECTION_INPUT_LOOP 1
 751
 752 #ifdef DATA_READY_LOOP
 753         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 754 #elif CONNECTION_INPUT_LOOP
 755         while(!rc)
 756 #endif
 757         {
 758                 rc = connection_input( c );
 759         }
 760
 761         if( rc < 0 ) {
 762                 Debug( LDAP_DEBUG_TRACE,
 763                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 764                         s, rc, c->c_connid );
 765
 766                 /* connections_mutex and c_mutex are locked */
 767                 connection_closing( c );
 768                 connection_close( c );
 769         }
 770
 771         connection_return( c );
 772         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 773         return 0;
 774 }
 775
 776 static int
 777 connection_input(
 778     Connection *conn
 779 )
 780 {
 781         Operation *op;
 782         ber_tag_t       tag;
 783         ber_len_t       len;
 784         ber_int_t       msgid;
 785         BerElement      *ber;
 786
 787         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 788             == NULL ) {
 789                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 790                 return -1;
 791         }
 792
 793         errno = 0;
 794         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 795             != LDAP_TAG_MESSAGE )
 796         {
 797                 int err = errno;
 798
 799                 Debug( LDAP_DEBUG_TRACE,
 800                         "ber_get_next on fd %d failed errno %d (%s)\n",
 801                         ber_pvt_sb_get_desc( conn->c_sb ), err,
 802                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 803                 Debug( LDAP_DEBUG_TRACE,
 804                         "\t*** got %ld of %lu so far\n",
 805                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 806                         conn->c_currentber->ber_len, 0 );
 807
 808                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 809                         /* log, close and send error */
 810                         ber_free( conn->c_currentber, 1 );
 811                         conn->c_currentber = NULL;
 812
 813                         return -2;
 814                 }
 815                 return 1;
 816         }
 817
 818         ber = conn->c_currentber;
 819         conn->c_currentber = NULL;
 820
 821         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 822                 /* log, close and send error */
 823                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 824                     0 );
 825                 ber_free( ber, 1 );
 826                 return -1;
 827         }
 828
 829         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 830                 /* log, close and send error */
 831                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 832                     0 );
 833                 ber_free( ber, 1 );
 834
 835                 return -1;
 836         }
 837
 838 #ifdef LDAP_COMPAT30
 839         if ( conn->c_version == 30 ) {
 840                 (void) ber_skip_tag( ber, &len );
 841         }
 842 #endif
 843
 844         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 845
 846         if ( conn->c_conn_state == SLAP_C_BINDING
 847                 || conn->c_conn_state == SLAP_C_CLOSING )
 848         {
 849                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 850                 slap_op_add( &conn->c_pending_ops, op );
 851
 852         } else {
 853                 connection_op_activate( conn, op );
 854         }
 855
 856 #ifdef NO_THREADS
 857         if ( conn->c_struct_state != SLAP_C_USED ) {
 858                 /* connection must have got closed underneath us */
 859                 return 1;
 860         }
 861 #endif
 862         assert( conn->c_struct_state == SLAP_C_USED );
 863
 864         return 0;
 865 }
 866
 867 static int
 868 connection_resched( Connection *conn )
 869 {
 870         Operation *op;
 871
 872         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 873                 Debug( LDAP_DEBUG_TRACE,
 874                         "connection_resched: attempting closing conn=%ld sd=%d.\n",
 875                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
 876
 877                 connection_close( conn );
 878                 return 0;
 879         }
 880
 881         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 882                 /* other states need different handling */
 883                 return 0;
 884         }
 885
 886         for( op = slap_op_pop( &conn->c_pending_ops );
 887                 op != NULL;
 888                 op = slap_op_pop( &conn->c_pending_ops ) )
 889         {
 890                 /* pending operations should not be marked for abandonment */
 891                 assert(!op->o_abandon);
 892
 893                 connection_op_activate( conn, op );
 894
 895                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 896                         break;
 897                 }
 898         }
 899         return 0;
 900 }
 901
 902 static int connection_op_activate( Connection *conn, Operation *op )
 903 {
 904         struct co_arg *arg;
 905         char *tmpdn;
 906         int status;
 907         ber_tag_t tag = op->o_tag;
 908
 909         if ( conn->c_dn != NULL ) {
 910                 tmpdn = ch_strdup( conn->c_dn );
 911         } else {
 912                 tmpdn = NULL;
 913         }
 914
 915         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
 916         arg->co_conn = conn;
 917         arg->co_op = op;
 918
 919         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
 920         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
 921
 922         slap_op_add( &conn->c_ops, arg->co_op );
 923
 924         if(tag == LDAP_REQ_BIND) {
 925                 conn->c_conn_state = SLAP_C_BINDING;
 926         }
 927
 928         if ( tmpdn != NULL ) {
 929                 free( tmpdn );
 930         }
 931
 932         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 933         active_threads++;
 934         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 935
 936         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
 937                                          connection_operation, (void *) arg );
 938
 939         if ( status != 0 ) {
 940                 Debug( LDAP_DEBUG_ANY,
 941                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
 942
 943                 /* should move op to pending list */
 944         }
 945
 946         return status;
 947 }
 948
 949 int connection_write(ber_socket_t s)
 950 {
 951         Connection *c;
 952         assert( connections != NULL );
 953
 954         ldap_pvt_thread_mutex_lock( &connections_mutex );
 955
 956         c = connection_get( s );
 957
 958         slapd_clr_write( s, 0);
 959
 960         if( c == NULL ) {
 961                 Debug( LDAP_DEBUG_ANY,
 962                         "connection_write(%ld): no connection!\n",
 963                         (long) s, 0, 0 );
 964                 slapd_remove(s, 0);
 965                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 966                 return -1;
 967         }
 968
 969         Debug( LDAP_DEBUG_TRACE,
 970                 "connection_write(%d): waking output for id=%ld\n",
 971                 s, c->c_connid, 0 );
 972
 973         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 974
 975         connection_return( c );
 976         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 977         return 0;
 978 }