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