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