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     c->c_protocol = 0;
 396
 397     c->c_activitytime = c->c_starttime = 0;
 398
 399     if(c->c_dn != NULL) {
 400         free(c->c_dn);
 401         c->c_dn = NULL;
 402     }
 403         if(c->c_cdn != NULL) {
 404                 free(c->c_cdn);
 405                 c->c_cdn = NULL;
 406         }
 407         if(c->c_client_name != NULL) {
 408                 free(c->c_client_name);
 409                 c->c_client_name = NULL;
 410         }
 411         if(c->c_client_addr != NULL) {
 412                 free(c->c_client_addr);
 413                 c->c_client_addr = NULL;
 414         }
 415
 416         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 417                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 418
 419                 slapd_remove( sd, 0 );
 420                 ber_pvt_sb_close( c->c_sb );
 421
 422                 Statslog( LDAP_DEBUG_STATS,
 423                     "conn=%d fd=%d closed.\n",
 424                         c->c_connid, sd, 0, 0, 0 );
 425         }
 426
 427         ber_pvt_sb_destroy( c->c_sb );
 428
 429     c->c_conn_state = SLAP_C_INVALID;
 430     c->c_struct_state = SLAP_C_UNUSED;
 431 }
 432
 433 int connection_state_closing( Connection *c )
 434 {
 435         /* c_mutex must be locked by caller */
 436
 437         int state;
 438         assert( c != NULL );
 439         assert( c->c_struct_state == SLAP_C_USED );
 440
 441         state = c->c_conn_state;
 442
 443         assert( state != SLAP_C_INVALID );
 444
 445         return state == SLAP_C_CLOSING;
 446 }
 447
 448 void connection_closing( 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_INVALID );
 454
 455         /* c_mutex must be locked by caller */
 456
 457         if( c->c_conn_state != SLAP_C_CLOSING ) {
 458                 Operation *o;
 459
 460                 Debug( LDAP_DEBUG_TRACE,
 461                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 462                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 463
 464                 /* update state to closing */
 465                 c->c_conn_state = SLAP_C_CLOSING;
 466
 467                 /* don't listen on this port anymore */
 468                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 469
 470                 /* shutdown I/O -- not yet implemented */
 471
 472                 /* abandon active operations */
 473                 for( o = c->c_ops; o != NULL; o = o->o_next ) {
 474                         ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 475                         o->o_abandon = 1;
 476                         ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 477                 }
 478
 479                 /* remove pending operations */
 480                 for( o = slap_op_pop( &c->c_pending_ops );
 481                         o != NULL;
 482                         o = slap_op_pop( &c->c_pending_ops ) )
 483                 {
 484                         slap_op_free( o );
 485                 }
 486
 487                 /* wake write blocked operations */
 488                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 489                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 490         }
 491 }
 492
 493 static void connection_close( Connection *c )
 494 {
 495         assert( connections != NULL );
 496         assert( c != NULL );
 497         assert( c->c_struct_state == SLAP_C_USED );
 498         assert( c->c_conn_state == SLAP_C_CLOSING );
 499
 500         /* note: connections_mutex and c_mutex should be locked by caller */
 501
 502         if( c->c_ops != NULL ) {
 503                 Debug( LDAP_DEBUG_TRACE,
 504                         "connection_close: deferring conn=%ld sd=%d.\n",
 505                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 506
 507                 return;
 508         }
 509
 510         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 511                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 512
 513         connection_destroy( c );
 514 }
 515
 516 unsigned long connections_nextid(void)
 517 {
 518         unsigned long id;
 519         assert( connections != NULL );
 520
 521         ldap_pvt_thread_mutex_lock( &connections_mutex );
 522
 523         id = conn_nextid;
 524
 525         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 526
 527         return id;
 528 }
 529
 530 Connection* connection_first( ber_socket_t *index )
 531 {
 532         assert( connections != NULL );
 533         assert( index != NULL );
 534
 535         ldap_pvt_thread_mutex_lock( &connections_mutex );
 536
 537         *index = 0;
 538
 539         return connection_next(NULL, index);
 540 }
 541
 542 Connection* connection_next( Connection *c, ber_socket_t *index )
 543 {
 544         assert( connections != NULL );
 545         assert( index != NULL );
 546         assert( *index <= dtblsize );
 547
 548         if( c != NULL ) {
 549                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 550         }
 551
 552         c = NULL;
 553
 554         for(; *index < dtblsize; (*index)++) {
 555                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 556                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 557 #ifndef HAVE_WINSOCK
 558                         continue;
 559 #else
 560                         break;
 561 #endif
 562                 }
 563
 564                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 565                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 566                         c = &connections[(*index)++];
 567                         break;
 568                 }
 569
 570                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 571                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 572         }
 573
 574         if( c != NULL ) {
 575                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 576         }
 577
 578         return c;
 579 }
 580
 581 void connection_done( Connection *c )
 582 {
 583         assert( connections != NULL );
 584
 585         if( c != NULL ) {
 586                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 587         }
 588
 589         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 590 }
 591
 592 /*
 593  * connection_activity - handle the request operation op on connection
 594  * conn.  This routine figures out what kind of operation it is and
 595  * calls the appropriate stub to handle it.
 596  */
 597
 598 static void *
 599 connection_operation( void *arg_v )
 600 {
 601         struct co_arg   *arg = arg_v;
 602         ber_tag_t tag = arg->co_op->o_tag;
 603         Connection *conn = arg->co_conn;
 604
 605 #ifdef LDAP_COUNTERS
 606         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 607         num_ops_initiated++;
 608         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 609 #endif
 610
 611         switch ( tag ) {
 612         case LDAP_REQ_BIND:
 613                 do_bind( conn, arg->co_op );
 614                 break;
 615
 616         case LDAP_REQ_UNBIND:
 617                 do_unbind( conn, arg->co_op );
 618                 break;
 619
 620         case LDAP_REQ_ADD:
 621                 do_add( conn, arg->co_op );
 622                 break;
 623
 624         case LDAP_REQ_DELETE:
 625                 do_delete( conn, arg->co_op );
 626                 break;
 627
 628         case LDAP_REQ_MODRDN:
 629                 do_modrdn( conn, arg->co_op );
 630                 break;
 631
 632         case LDAP_REQ_MODIFY:
 633                 do_modify( conn, arg->co_op );
 634                 break;
 635
 636         case LDAP_REQ_COMPARE:
 637                 do_compare( conn, arg->co_op );
 638                 break;
 639
 640         case LDAP_REQ_SEARCH:
 641                 do_search( conn, arg->co_op );
 642                 break;
 643
 644         case LDAP_REQ_ABANDON:
 645                 do_abandon( conn, arg->co_op );
 646                 break;
 647
 648         default:
 649                 Debug( LDAP_DEBUG_ANY, "unknown request 0x%lx\n",
 650                     arg->co_op->o_tag, 0, 0 );
 651                 break;
 652         }
 653
 654 #ifdef LDAP_COUNTERS
 655         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 656         num_ops_completed++;
 657         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 658 #endif
 659
 660         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 661
 662 #ifdef LDAP_COUNTERS
 663         conn->c_n_ops_completed++;
 664 #endif
 665
 666         slap_op_remove( &conn->c_ops, arg->co_op );
 667         slap_op_free( arg->co_op );
 668         arg->co_op = NULL;
 669         arg->co_conn = NULL;
 670         free( (char *) arg );
 671         arg = NULL;
 672
 673         switch( tag ) {
 674         case LDAP_REQ_UNBIND:
 675                 /* c_mutex is locked */
 676                 connection_closing( conn );
 677                 break;
 678
 679         case LDAP_REQ_BIND:
 680                 if( conn->c_conn_state == SLAP_C_BINDING) {
 681                         conn->c_conn_state = SLAP_C_ACTIVE;
 682                 }
 683         }
 684
 685         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 686         active_threads--;
 687         if( active_threads < 1 ) {
 688                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 689         }
 690         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 691
 692         connection_resched( conn );
 693
 694         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 695
 696         return NULL;
 697 }
 698
 699 int connection_read(ber_socket_t s)
 700 {
 701         int rc = 0;
 702         Connection *c;
 703         assert( connections != NULL );
 704
 705         ldap_pvt_thread_mutex_lock( &connections_mutex );
 706
 707         /* get (locked) connection */
 708         c = connection_get( s );
 709
 710         if( c == NULL ) {
 711                 Debug( LDAP_DEBUG_ANY,
 712                         "connection_read(%ld): no connection!\n",
 713                         (long) s, 0, 0 );
 714
 715                 slapd_remove(s, 0);
 716
 717                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 718                 return -1;
 719         }
 720
 721         if( c->c_conn_state == SLAP_C_CLOSING ) {
 722                 Debug( LDAP_DEBUG_TRACE,
 723                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 724                         s, c->c_connid, 0 );
 725
 726                 connection_return( c );
 727                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 728                 return 0;
 729         }
 730
 731         Debug( LDAP_DEBUG_TRACE,
 732                 "connection_read(%d): checking for input on id=%ld\n",
 733                 s, c->c_connid, 0 );
 734
 735 #define CONNECTION_INPUT_LOOP 1
 736
 737 #ifdef DATA_READY_LOOP
 738         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 739 #elif CONNECTION_INPUT_LOOP
 740         while(!rc)
 741 #endif
 742         {
 743                 rc = connection_input( c );
 744         }
 745
 746         if( rc < 0 ) {
 747                 Debug( LDAP_DEBUG_TRACE,
 748                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 749                         s, rc, c->c_connid );
 750
 751                 /* connections_mutex and c_mutex are locked */
 752                 connection_closing( c );
 753                 connection_close( c );
 754         }
 755
 756         connection_return( c );
 757         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 758         return 0;
 759 }
 760
 761 static int
 762 connection_input(
 763     Connection *conn
 764 )
 765 {
 766         Operation *op;
 767         ber_tag_t       tag;
 768         ber_len_t       len;
 769         ber_int_t       msgid;
 770         BerElement      *ber;
 771
 772         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 773             == NULL ) {
 774                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 775                 return -1;
 776         }
 777
 778         errno = 0;
 779         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 780             != LDAP_TAG_MESSAGE )
 781         {
 782                 int err = errno;
 783
 784                 Debug( LDAP_DEBUG_TRACE,
 785                         "ber_get_next on fd %d failed errno %d (%s)\n",
 786                         ber_pvt_sb_get_desc( conn->c_sb ), err,
 787                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 788                 Debug( LDAP_DEBUG_TRACE,
 789                         "\t*** got %ld of %lu so far\n",
 790                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 791                         conn->c_currentber->ber_len, 0 );
 792
 793                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 794                         /* log, close and send error */
 795                         ber_free( conn->c_currentber, 1 );
 796                         conn->c_currentber = NULL;
 797
 798                         return -2;
 799                 }
 800                 return 1;
 801         }
 802
 803         ber = conn->c_currentber;
 804         conn->c_currentber = NULL;
 805
 806         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 807                 /* log, close and send error */
 808                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 809                     0 );
 810                 ber_free( ber, 1 );
 811                 return -1;
 812         }
 813
 814         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 815                 /* log, close and send error */
 816                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 817                     0 );
 818                 ber_free( ber, 1 );
 819
 820                 return -1;
 821         }
 822
 823         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 824
 825         if ( conn->c_conn_state == SLAP_C_BINDING
 826                 || conn->c_conn_state == SLAP_C_CLOSING )
 827         {
 828                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 829                 slap_op_add( &conn->c_pending_ops, op );
 830
 831         } else {
 832                 connection_op_activate( conn, op );
 833         }
 834
 835 #ifdef NO_THREADS
 836         if ( conn->c_struct_state != SLAP_C_USED ) {
 837                 /* connection must have got closed underneath us */
 838                 return 1;
 839         }
 840 #endif
 841         assert( conn->c_struct_state == SLAP_C_USED );
 842
 843         return 0;
 844 }
 845
 846 static int
 847 connection_resched( Connection *conn )
 848 {
 849         Operation *op;
 850
 851         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 852                 Debug( LDAP_DEBUG_TRACE,
 853                         "connection_resched: attempting closing conn=%ld sd=%d.\n",
 854                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
 855
 856                 connection_close( conn );
 857                 return 0;
 858         }
 859
 860         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 861                 /* other states need different handling */
 862                 return 0;
 863         }
 864
 865         for( op = slap_op_pop( &conn->c_pending_ops );
 866                 op != NULL;
 867                 op = slap_op_pop( &conn->c_pending_ops ) )
 868         {
 869                 /* pending operations should not be marked for abandonment */
 870                 assert(!op->o_abandon);
 871
 872                 connection_op_activate( conn, op );
 873
 874                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 875                         break;
 876                 }
 877         }
 878         return 0;
 879 }
 880
 881 static int connection_op_activate( Connection *conn, Operation *op )
 882 {
 883         struct co_arg *arg;
 884         char *tmpdn;
 885         int status;
 886         ber_tag_t tag = op->o_tag;
 887
 888         if ( conn->c_dn != NULL ) {
 889                 tmpdn = ch_strdup( conn->c_dn );
 890         } else {
 891                 tmpdn = NULL;
 892         }
 893
 894         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
 895         arg->co_conn = conn;
 896         arg->co_op = op;
 897
 898         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
 899         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
 900
 901         slap_op_add( &conn->c_ops, arg->co_op );
 902
 903         if(tag == LDAP_REQ_BIND) {
 904                 conn->c_conn_state = SLAP_C_BINDING;
 905         }
 906
 907         if ( tmpdn != NULL ) {
 908                 free( tmpdn );
 909         }
 910
 911         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 912         active_threads++;
 913         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 914
 915         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
 916                                          connection_operation, (void *) arg );
 917
 918         if ( status != 0 ) {
 919                 Debug( LDAP_DEBUG_ANY,
 920                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
 921
 922                 /* should move op to pending list */
 923         }
 924
 925         return status;
 926 }
 927
 928 int connection_write(ber_socket_t s)
 929 {
 930         Connection *c;
 931         assert( connections != NULL );
 932
 933         ldap_pvt_thread_mutex_lock( &connections_mutex );
 934
 935         c = connection_get( s );
 936
 937         slapd_clr_write( s, 0);
 938
 939         if( c == NULL ) {
 940                 Debug( LDAP_DEBUG_ANY,
 941                         "connection_write(%ld): no connection!\n",
 942                         (long) s, 0, 0 );
 943                 slapd_remove(s, 0);
 944                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 945                 return -1;
 946         }
 947
 948         Debug( LDAP_DEBUG_TRACE,
 949                 "connection_write(%d): waking output for id=%ld\n",
 950                 s, c->c_connid, 0 );
 951
 952         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 953
 954         connection_return( c );
 955         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 956         return 0;
 957 }