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_UNINITIALIZED );
 160
 161         if( c->c_struct_state != SLAP_C_USED ) {
 162                 /* connection must have been closed */
 163                 assert( c->c_conn_state == SLAP_C_INVALID );
 164                 assert( !ber_pvt_sb_in_use( c->c_sb ) );
 165
 166                 return NULL;
 167         }
 168
 169 #else
 170         c = NULL;
 171         {
 172                 int i;
 173
 174                 for(i=0; i<dtblsize; i++) {
 175                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 176                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 177                                 assert( connections[i].c_sb == 0 );
 178                                 break;
 179                         }
 180
 181                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 182                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 183                                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ) );
 184                                 continue;
 185                         }
 186
 187                         assert( connections[i].c_struct_state == SLAP_C_USED );
 188                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 189                         assert( ber_pvt_sb_in_use( connections[i].c_sb ) );
 190
 191                         if( ber_pvt_sb_get_desc( connections[i].c_sb ) == s ) {
 192                                 c = &connections[i];
 193                                 break;
 194                         }
 195                 }
 196         }
 197 #endif
 198
 199         if( c != NULL ) {
 200                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 201
 202                 /* we do this AFTER locking to aid in debugging */
 203                 Debug( LDAP_DEBUG_TRACE,
 204                         "connection_get(%d): got connid=%ld\n",
 205                         s, c->c_connid, 0 );
 206
 207                 assert( c->c_struct_state == SLAP_C_USED );
 208                 assert( c->c_conn_state != SLAP_C_INVALID );
 209                 assert( ber_pvt_sb_in_use( c->c_sb ) );
 210         }
 211
 212         return c;
 213 }
 214
 215 static void connection_return( Connection *c )
 216 {
 217         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 218 }
 219
 220 long connection_init(
 221         int s,
 222         const char* name,
 223         const char* addr)
 224 {
 225         long id;
 226         Connection *c;
 227         assert( connections != NULL );
 228
 229         if( s < 0 ) {
 230         Debug( LDAP_DEBUG_ANY,
 231                         "connection_init(%d): invalid.\n",
 232                         s, 0, 0 );
 233                 return -1;
 234         }
 235
 236         assert( s >= 0 );
 237 #ifndef HAVE_WINSOCK
 238         assert( s < dtblsize );
 239 #endif
 240
 241         ldap_pvt_thread_mutex_lock( &connections_mutex );
 242
 243 #ifndef HAVE_WINSOCK
 244         c = &connections[s];
 245
 246 #else
 247         {
 248                 int i;
 249
 250                 c = NULL;
 251
 252         for( i=0; i < dtblsize; i++) {
 253             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 254                 assert( connections[i].c_sb == 0 );
 255                 c = &connections[i];
 256                 break;
 257             }
 258
 259             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 260                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
 261                 c = &connections[i];
 262                 break;
 263             }
 264
 265             assert( connections[i].c_struct_state == SLAP_C_USED );
 266             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 267             assert( ber_pvt_sb_in_use( connections[i].c_sb ));
 268         }
 269
 270         if( c == NULL ) {
 271                 Debug( LDAP_DEBUG_ANY,
 272                                 "connection_init(%d): connection table full (%d/%d).\n",
 273                                 s, i, dtblsize);
 274             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 275             return -1;
 276         }
 277     }
 278 #endif
 279
 280     assert( c != NULL );
 281     assert( c->c_struct_state != SLAP_C_USED );
 282     assert( c->c_conn_state == SLAP_C_INVALID );
 283
 284     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 285         c->c_dn = NULL;
 286         c->c_cdn = NULL;
 287         c->c_client_name = NULL;
 288         c->c_client_addr = NULL;
 289         c->c_ops = NULL;
 290         c->c_pending_ops = NULL;
 291
 292         c->c_sb = ber_sockbuf_alloc( );
 293
 294         /* should check status of thread calls */
 295         ldap_pvt_thread_mutex_init( &c->c_mutex );
 296         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 297         ldap_pvt_thread_cond_init( &c->c_write_cv );
 298
 299         c->c_struct_state = SLAP_C_UNUSED;
 300     }
 301
 302     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 303
 304     assert( c->c_struct_state == SLAP_C_UNUSED );
 305     assert(     c->c_dn == NULL );
 306     assert(     c->c_cdn == NULL );
 307     assert( c->c_client_name == NULL );
 308     assert( c->c_client_addr == NULL );
 309     assert( c->c_ops == NULL );
 310     assert( c->c_pending_ops == NULL );
 311
 312     c->c_client_name = ch_strdup( name == NULL ? "" : name );
 313     c->c_client_addr = ch_strdup( addr );
 314
 315     c->c_n_ops_received = 0;
 316 #ifdef LDAP_COUNTERS
 317     c->c_n_ops_executing = 0;
 318     c->c_n_ops_pending = 0;
 319     c->c_n_ops_completed = 0;
 320 #endif
 321
 322     c->c_starttime = slap_get_time();
 323
 324     ber_pvt_sb_set_desc( c->c_sb, s );
 325     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 326
 327     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 328         Debug( LDAP_DEBUG_ANY,
 329             "connection_init(%d, %s, %s): set nonblocking failed\n",
 330             s, c->c_client_name, c->c_client_addr);
 331     }
 332
 333     id = c->c_connid = conn_nextid++;
 334
 335     c->c_conn_state = SLAP_C_INACTIVE;
 336     c->c_struct_state = SLAP_C_USED;
 337
 338     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 339     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 340
 341     return id;
 342 }
 343
 344 static void
 345 connection_destroy( Connection *c )
 346 {
 347         /* note: connections_mutex should be locked by caller */
 348
 349     assert( connections != NULL );
 350     assert( c != NULL );
 351     assert( c->c_struct_state != SLAP_C_UNUSED );
 352     assert( c->c_conn_state != SLAP_C_INVALID );
 353     assert( c->c_ops == NULL );
 354
 355     c->c_struct_state = SLAP_C_UNUSED;
 356     c->c_conn_state = SLAP_C_INVALID;
 357
 358 #ifdef LDAP_COMPAT30
 359     c->c_version = 0;
 360 #endif
 361     c->c_protocol = 0;
 362
 363     c->c_starttime = 0;
 364
 365     if(c->c_dn != NULL) {
 366         free(c->c_dn);
 367         c->c_dn = NULL;
 368     }
 369         if(c->c_cdn != NULL) {
 370                 free(c->c_cdn);
 371                 c->c_cdn = NULL;
 372         }
 373         if(c->c_client_name != NULL) {
 374                 free(c->c_client_name);
 375                 c->c_client_name = NULL;
 376         }
 377         if(c->c_client_addr != NULL) {
 378                 free(c->c_client_addr);
 379                 c->c_client_addr = NULL;
 380         }
 381
 382         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 383                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 384
 385                 slapd_remove( sd, 0 );
 386                 ber_pvt_sb_close( c->c_sb );
 387
 388                 Statslog( LDAP_DEBUG_STATS,
 389                     "conn=%d fd=%d closed.\n",
 390                         c->c_connid, sd, 0, 0, 0 );
 391         }
 392
 393         ber_pvt_sb_destroy( c->c_sb );
 394 }
 395
 396 int connection_state_closing( Connection *c )
 397 {
 398         /* c_mutex must be locked by caller */
 399
 400         int state;
 401         assert( c != NULL );
 402         assert( c->c_struct_state == SLAP_C_USED );
 403
 404         state = c->c_conn_state;
 405
 406         assert( state != SLAP_C_INVALID );
 407
 408         return state == SLAP_C_CLOSING;
 409 }
 410
 411 void connection_closing( Connection *c )
 412 {
 413         assert( connections != NULL );
 414         assert( c != NULL );
 415         assert( c->c_struct_state == SLAP_C_USED );
 416         assert( c->c_conn_state != SLAP_C_INVALID );
 417
 418         /* c_mutex must be locked by caller */
 419
 420         if( c->c_conn_state != SLAP_C_CLOSING ) {
 421                 Operation *o;
 422
 423                 Debug( LDAP_DEBUG_TRACE,
 424                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 425                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 426
 427                 /* update state to closing */
 428                 c->c_conn_state = SLAP_C_CLOSING;
 429
 430                 /* don't listen on this port anymore */
 431                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 432
 433                 /* shutdown I/O -- not yet implemented */
 434
 435                 /* abandon active operations */
 436                 for( o = c->c_ops; o != NULL; o = o->o_next ) {
 437                         ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 438                         o->o_abandon = 1;
 439                         ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 440                 }
 441
 442                 /* remove pending operations */
 443                 for( o = slap_op_pop( &c->c_pending_ops );
 444                         o != NULL;
 445                         o = slap_op_pop( &c->c_pending_ops ) )
 446                 {
 447                         slap_op_free( o );
 448                 }
 449
 450                 /* wake write blocked operations */
 451                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 452                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 453         }
 454 }
 455
 456 static void connection_close( Connection *c )
 457 {
 458         assert( connections != NULL );
 459         assert( c != NULL );
 460         assert( c->c_struct_state == SLAP_C_USED );
 461         assert( c->c_conn_state == SLAP_C_CLOSING );
 462
 463         /* note: connections_mutex and c_mutex should be locked by caller */
 464
 465         if( c->c_ops != NULL ) {
 466                 Debug( LDAP_DEBUG_TRACE,
 467                         "connection_close: deferring conn=%ld sd=%d.\n",
 468                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 469
 470                 return;
 471         }
 472
 473         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 474                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 475
 476         connection_destroy( c );
 477 }
 478
 479 long connections_nextid(void)
 480 {
 481         long id;
 482         assert( connections != NULL );
 483
 484         ldap_pvt_thread_mutex_lock( &connections_mutex );
 485
 486         id = conn_nextid;
 487
 488         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 489
 490         return id;
 491 }
 492
 493 Connection* connection_first( int *index )
 494 {
 495         assert( connections != NULL );
 496         assert( index != NULL );
 497
 498         ldap_pvt_thread_mutex_lock( &connections_mutex );
 499
 500         *index = 0;
 501
 502         return connection_next(NULL, index);
 503 }
 504
 505 Connection* connection_next( Connection *c, int *index )
 506 {
 507         assert( connections != NULL );
 508         assert( index != NULL );
 509         assert( *index <= dtblsize );
 510
 511         if( c != NULL ) {
 512                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 513         }
 514
 515         c = NULL;
 516
 517         for(; *index < dtblsize; (*index)++) {
 518                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 519                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 520 #ifndef HAVE_WINSOCK
 521                         continue;
 522 #else
 523                         break;
 524 #endif
 525                 }
 526
 527                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 528                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 529                         c = &connections[(*index)++];
 530                         break;
 531                 }
 532
 533                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 534                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 535         }
 536
 537         if( c != NULL ) {
 538                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 539         }
 540
 541         return c;
 542 }
 543
 544 void connection_done( Connection *c )
 545 {
 546         assert( connections != NULL );
 547
 548         if( c != NULL ) {
 549                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 550         }
 551
 552         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 553 }
 554
 555 /*
 556  * connection_activity - handle the request operation op on connection
 557  * conn.  This routine figures out what kind of operation it is and
 558  * calls the appropriate stub to handle it.
 559  */
 560
 561 static void *
 562 connection_operation( void *arg_v )
 563 {
 564         struct co_arg   *arg = arg_v;
 565         int tag = arg->co_op->o_tag;
 566         Connection *conn = arg->co_conn;
 567
 568 #ifdef LDAP_COUNTERS
 569         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 570         num_ops_initiated++;
 571         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 572 #endif
 573
 574         switch ( tag ) {
 575         case LDAP_REQ_BIND:
 576                 do_bind( conn, arg->co_op );
 577                 break;
 578
 579 #ifdef LDAP_COMPAT30
 580         case LDAP_REQ_UNBIND_30:
 581 #endif
 582         case LDAP_REQ_UNBIND:
 583                 do_unbind( conn, arg->co_op );
 584                 break;
 585
 586         case LDAP_REQ_ADD:
 587                 do_add( conn, arg->co_op );
 588                 break;
 589
 590 #ifdef LDAP_COMPAT30
 591         case LDAP_REQ_DELETE_30:
 592 #endif
 593         case LDAP_REQ_DELETE:
 594                 do_delete( conn, arg->co_op );
 595                 break;
 596
 597         case LDAP_REQ_MODRDN:
 598                 do_modrdn( conn, arg->co_op );
 599                 break;
 600
 601         case LDAP_REQ_MODIFY:
 602                 do_modify( conn, arg->co_op );
 603                 break;
 604
 605         case LDAP_REQ_COMPARE:
 606                 do_compare( conn, arg->co_op );
 607                 break;
 608
 609         case LDAP_REQ_SEARCH:
 610                 do_search( conn, arg->co_op );
 611                 break;
 612
 613 #ifdef LDAP_COMPAT30
 614         case LDAP_REQ_ABANDON_30:
 615 #endif
 616         case LDAP_REQ_ABANDON:
 617                 do_abandon( conn, arg->co_op );
 618                 break;
 619
 620         default:
 621                 Debug( LDAP_DEBUG_ANY, "unknown request 0x%lx\n",
 622                     arg->co_op->o_tag, 0, 0 );
 623                 break;
 624         }
 625
 626 #ifdef LDAP_COUNTERS
 627         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 628         num_ops_completed++;
 629         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 630 #endif
 631
 632         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 633
 634 #ifdef LDAP_COUNTERS
 635         conn->c_n_ops_completed++;
 636 #endif
 637
 638         slap_op_remove( &conn->c_ops, arg->co_op );
 639         slap_op_free( arg->co_op );
 640         arg->co_op = NULL;
 641         arg->co_conn = NULL;
 642         free( (char *) arg );
 643         arg = NULL;
 644
 645         switch( tag ) {
 646 #ifdef LDAP_COMPAT30
 647         case LDAP_REQ_UNBIND_30:
 648 #endif
 649         case LDAP_REQ_UNBIND:
 650                 /* c_mutex is locked */
 651                 connection_closing( conn );
 652                 break;
 653
 654         case LDAP_REQ_BIND:
 655                 if( conn->c_conn_state == SLAP_C_BINDING) {
 656                         conn->c_conn_state = SLAP_C_ACTIVE;
 657                 }
 658         }
 659
 660         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 661         active_threads--;
 662         if( active_threads < 1 ) {
 663                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 664         }
 665         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 666
 667         connection_resched( conn );
 668
 669         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 670
 671         return NULL;
 672 }
 673
 674 int connection_read(int s)
 675 {
 676         int rc = 0;
 677         Connection *c;
 678         assert( connections != NULL );
 679
 680         ldap_pvt_thread_mutex_lock( &connections_mutex );
 681
 682         /* get (locked) connection */
 683         c = connection_get( s );
 684
 685         if( c == NULL ) {
 686                 Debug( LDAP_DEBUG_ANY,
 687                         "connection_read(%d): no connection!\n",
 688                         s, 0, 0 );
 689
 690                 slapd_remove(s, 0);
 691
 692                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 693                 return -1;
 694         }
 695
 696         if( c->c_conn_state == SLAP_C_CLOSING ) {
 697                 Debug( LDAP_DEBUG_TRACE,
 698                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 699                         s, c->c_connid, 0 );
 700
 701                 connection_return( c );
 702                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 703                 return 0;
 704         }
 705
 706         Debug( LDAP_DEBUG_TRACE,
 707                 "connection_read(%d): checking for input on id=%ld\n",
 708                 s, c->c_connid, 0 );
 709
 710 #define CONNECTION_INPUT_LOOP 1
 711
 712 #ifdef DATA_READY_LOOP
 713         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 714 #elif CONNECTION_INPUT_LOOP
 715         while(!rc)
 716 #endif
 717         {
 718                 rc = connection_input( c );
 719         }
 720
 721         if( rc < 0 ) {
 722                 Debug( LDAP_DEBUG_TRACE,
 723                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 724                         s, rc, c->c_connid );
 725
 726                 /* connections_mutex and c_mutex are locked */
 727                 connection_closing( c );
 728                 connection_close( c );
 729         }
 730
 731         connection_return( c );
 732         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 733         return 0;
 734 }
 735
 736 static int
 737 connection_input(
 738     Connection *conn
 739 )
 740 {
 741         Operation *op;
 742         unsigned long   tag, len;
 743         long            msgid;
 744         BerElement      *ber;
 745
 746         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 747             == NULL ) {
 748                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 749                 return -1;
 750         }
 751
 752         errno = 0;
 753         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 754             != LDAP_TAG_MESSAGE )
 755         {
 756                 int err = errno;
 757
 758                 Debug( LDAP_DEBUG_TRACE,
 759                         "ber_get_next on fd %d failed errno %d (%s)\n",
 760                         ber_pvt_sb_get_desc( conn->c_sb ), err,
 761                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 762                 Debug( LDAP_DEBUG_TRACE,
 763                         "\t*** got %ld of %lu so far\n",
 764                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 765                         conn->c_currentber->ber_len, 0 );
 766
 767                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 768                         /* log, close and send error */
 769                         ber_free( conn->c_currentber, 1 );
 770                         conn->c_currentber = NULL;
 771
 772                         return -2;
 773                 }
 774                 return 1;
 775         }
 776
 777         ber = conn->c_currentber;
 778         conn->c_currentber = NULL;
 779
 780         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 781                 /* log, close and send error */
 782                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 783                     0 );
 784                 ber_free( ber, 1 );
 785                 return -1;
 786         }
 787
 788         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 789                 /* log, close and send error */
 790                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 791                     0 );
 792                 ber_free( ber, 1 );
 793
 794                 return -1;
 795         }
 796
 797 #ifdef LDAP_COMPAT30
 798         if ( conn->c_version == 30 ) {
 799                 (void) ber_skip_tag( ber, &len );
 800         }
 801 #endif
 802
 803         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 804
 805         if ( conn->c_conn_state == SLAP_C_BINDING
 806                 || conn->c_conn_state == SLAP_C_CLOSING )
 807         {
 808                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 809                 slap_op_add( &conn->c_pending_ops, op );
 810
 811         } else {
 812                 connection_op_activate( conn, op );
 813         }
 814
 815 #ifdef NO_THREADS
 816         if ( conn->c_struct_state != SLAP_C_USED ) {
 817                 /* connection must have got closed underneath us */
 818                 return 1;
 819         }
 820 #endif
 821         assert( conn->c_struct_state == SLAP_C_USED );
 822
 823         return 0;
 824 }
 825
 826 static int
 827 connection_resched( Connection *conn )
 828 {
 829         Operation *op;
 830
 831         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 832                 Debug( LDAP_DEBUG_TRACE,
 833                         "connection_resched: attempting closing conn=%ld sd=%d.\n",
 834                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
 835
 836                 connection_close( conn );
 837                 return 0;
 838         }
 839
 840         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 841                 /* other states need different handling */
 842                 return 0;
 843         }
 844
 845         for( op = slap_op_pop( &conn->c_pending_ops );
 846                 op != NULL;
 847                 op = slap_op_pop( &conn->c_pending_ops ) )
 848         {
 849                 /* pending operations should not be marked for abandonment */
 850                 assert(!op->o_abandon);
 851
 852                 connection_op_activate( conn, op );
 853
 854                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 855                         break;
 856                 }
 857         }
 858         return 0;
 859 }
 860
 861 static int connection_op_activate( Connection *conn, Operation *op )
 862 {
 863         struct co_arg *arg;
 864         char *tmpdn;
 865         int status;
 866         unsigned long tag = op->o_tag;
 867
 868         if ( conn->c_dn != NULL ) {
 869                 tmpdn = ch_strdup( conn->c_dn );
 870         } else {
 871                 tmpdn = NULL;
 872         }
 873
 874         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
 875         arg->co_conn = conn;
 876         arg->co_op = op;
 877
 878         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
 879         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
 880
 881         slap_op_add( &conn->c_ops, arg->co_op );
 882
 883         if(tag == LDAP_REQ_BIND) {
 884                 conn->c_conn_state = SLAP_C_BINDING;
 885         }
 886
 887         if ( tmpdn != NULL ) {
 888                 free( tmpdn );
 889         }
 890
 891         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 892         active_threads++;
 893         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 894
 895         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
 896                                          connection_operation, (void *) arg );
 897
 898         if ( status != 0 ) {
 899                 Debug( LDAP_DEBUG_ANY,
 900                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
 901
 902                 /* should move op to pending list */
 903         }
 904
 905         return status;
 906 }
 907
 908 int connection_write(int s)
 909 {
 910         Connection *c;
 911         assert( connections != NULL );
 912
 913         ldap_pvt_thread_mutex_lock( &connections_mutex );
 914
 915         c = connection_get( s );
 916
 917         slapd_clr_write( s, 0);
 918
 919         if( c == NULL ) {
 920                 Debug( LDAP_DEBUG_ANY,
 921                         "connection_write(%d): no connection!\n",
 922                         s, 0, 0 );
 923                 slapd_remove(s, 0);
 924                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 925                 return -1;
 926         }
 927
 928         Debug( LDAP_DEBUG_TRACE,
 929                 "connection_write(%d): waking output for id=%ld\n",
 930                 s, c->c_connid, 0 );
 931
 932         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 933
 934         connection_return( c );
 935         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 936         return 0;
 937 }