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 char* connection_state2str( int state ) {
  34         switch( state ) {
  35         case SLAP_C_INVALID:    return "!";
  36         case SLAP_C_INACTIVE:   return "|";
  37         case SLAP_C_ACTIVE:             return "";
  38         case SLAP_C_BINDING:    return "B";
  39         case SLAP_C_CLOSING:    return "C";
  40         }
  41
  42         return "?";
  43 }
  44
  45 static Connection* connection_get( ber_socket_t s );
  46
  47 static int connection_input( Connection *c );
  48 static void connection_close( Connection *c );
  49
  50 static int connection_op_activate( Connection *conn, Operation *op );
  51 static int connection_resched( Connection *conn );
  52 static void connection_abandon( Connection *conn );
  53 static void connection_destroy( Connection *c );
  54
  55 struct co_arg {
  56         Connection      *co_conn;
  57         Operation       *co_op;
  58 };
  59
  60 /*
  61  * Initialize connection management infrastructure.
  62  */
  63 int connections_init(void)
  64 {
  65         assert( connections == NULL );
  66
  67         if( connections != NULL) {
  68                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  69                         0, 0, 0 );
  70                 return -1;
  71         }
  72
  73         /* should check return of every call */
  74         ldap_pvt_thread_mutex_init( &connections_mutex );
  75
  76         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  77
  78         if( connections == NULL ) {
  79                 Debug( LDAP_DEBUG_ANY,
  80                         "connections_init: allocation (%d*%ld) of connection array failed.\n",
  81                         dtblsize, (long) sizeof(Connection), 0 );
  82                 return -1;
  83         }
  84
  85     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  86     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  87
  88         /*
  89          * per entry initialization of the Connection array initialization
  90          * will be done by connection_init()
  91          */
  92
  93         return 0;
  94 }
  95
  96 /*
  97  * Destroy connection management infrastructure.
  98  */
  99 int connections_destroy(void)
 100 {
 101         ber_socket_t i;
 102
 103         /* should check return of every call */
 104
 105         if( connections == NULL) {
 106                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 107                         0, 0, 0 );
 108                 return -1;
 109         }
 110
 111         for ( i = 0; i < dtblsize; i++ ) {
 112                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 113                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 114                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 115                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 116                 }
 117         }
 118
 119         free( connections );
 120         connections = NULL;
 121
 122         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 123         return 0;
 124 }
 125
 126 /*
 127  * shutdown all connections
 128  */
 129 int connections_shutdown(void)
 130 {
 131         ber_socket_t i;
 132
 133         ldap_pvt_thread_mutex_lock( &connections_mutex );
 134
 135         for ( i = 0; i < dtblsize; i++ ) {
 136                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 137                         continue;
 138                 }
 139
 140                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 141
 142                 /* connections_mutex and c_mutex are locked */
 143                 connection_closing( &connections[i] );
 144                 connection_close( &connections[i] );
 145
 146                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 147         }
 148
 149         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 150
 151         return 0;
 152 }
 153
 154 /*
 155  * Timeout idle connections.
 156  */
 157 int connections_timeout_idle(time_t now)
 158 {
 159         int i = 0;
 160         int connindex;
 161         Connection* c;
 162
 163         ldap_pvt_thread_mutex_lock( &connections_mutex );
 164
 165         for( c = connection_first( &connindex );
 166                 c != NULL;
 167                 c = connection_next( c, &connindex ) )
 168         {
 169                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 170                         /* close it */
 171                         connection_closing( c );
 172                         connection_close( c );
 173                         i++;
 174                 }
 175         }
 176         connection_done( c );
 177
 178         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 179
 180         return i;
 181 }
 182
 183 static Connection* connection_get( ber_socket_t s )
 184 {
 185         /* connections_mutex should be locked by caller */
 186
 187         Connection *c;
 188
 189         Debug( LDAP_DEBUG_ARGS,
 190                 "connection_get(%ld)\n",
 191                 (long) s, 0, 0 );
 192
 193         assert( connections != NULL );
 194
 195         if(s == AC_SOCKET_INVALID) {
 196                 return NULL;
 197         }
 198
 199 #ifndef HAVE_WINSOCK
 200         c = &connections[s];
 201
 202         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 203
 204 #else
 205         c = NULL;
 206         {
 207                 ber_socket_t i;
 208
 209                 for(i=0; i<dtblsize; i++) {
 210                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 211                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 212                                 assert( connections[i].c_sb == 0 );
 213                                 break;
 214                         }
 215
 216                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 217                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 218                                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ) );
 219                                 continue;
 220                         }
 221
 222                         /* state can actually change from used -> unused by resched,
 223                          * so don't assert details here.
 224                          */
 225
 226                         if( ber_pvt_sb_get_desc( connections[i].c_sb ) == s ) {
 227                                 c = &connections[i];
 228                                 break;
 229                         }
 230                 }
 231         }
 232 #endif
 233
 234         if( c != NULL ) {
 235                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 236
 237                 if( c->c_struct_state != SLAP_C_USED ) {
 238                         /* connection must have been closed due to resched */
 239
 240                         assert( c->c_conn_state == SLAP_C_INVALID );
 241                         assert( !ber_pvt_sb_in_use( c->c_sb ) );
 242
 243                         Debug( LDAP_DEBUG_TRACE,
 244                                 "connection_get(%d): connection not used.\n",
 245                                 s, c->c_connid, 0 );
 246
 247                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 248                         return NULL;
 249                 }
 250
 251                 Debug( LDAP_DEBUG_TRACE,
 252                         "connection_get(%d): got connid=%ld\n",
 253                         s, c->c_connid, 0 );
 254
 255                 c->c_n_get++;
 256
 257                 assert( c->c_struct_state == SLAP_C_USED );
 258                 assert( c->c_conn_state != SLAP_C_INVALID );
 259                 assert( ber_pvt_sb_in_use( c->c_sb ) );
 260
 261         c->c_activitytime = slap_get_time();
 262         }
 263
 264         return c;
 265 }
 266
 267 static void connection_return( Connection *c )
 268 {
 269         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 270 }
 271
 272 long connection_init(
 273         ber_socket_t s,
 274         const char* url,
 275         const char* dnsname,
 276         const char* peername,
 277         const char* sockname,
 278         int use_tls )
 279 {
 280         unsigned long id;
 281         Connection *c;
 282
 283         assert( connections != NULL );
 284
 285         assert( dnsname != NULL );
 286         assert( peername != NULL );
 287         assert( sockname != NULL );
 288
 289 #ifndef HAVE_TLS
 290         assert( !use_tls );
 291 #endif
 292
 293         if( s == AC_SOCKET_INVALID ) {
 294         Debug( LDAP_DEBUG_ANY,
 295                         "connection_init(%ld): invalid.\n",
 296                         (long) s, 0, 0 );
 297                 return -1;
 298         }
 299
 300         assert( s >= 0 );
 301 #ifndef HAVE_WINSOCK
 302         assert( s < dtblsize );
 303 #endif
 304
 305         ldap_pvt_thread_mutex_lock( &connections_mutex );
 306
 307 #ifndef HAVE_WINSOCK
 308         c = &connections[s];
 309
 310 #else
 311         {
 312                 unsigned int i;
 313
 314                 c = NULL;
 315
 316         for( i=0; i < dtblsize; i++) {
 317             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 318                 assert( connections[i].c_sb == 0 );
 319                 c = &connections[i];
 320                 break;
 321             }
 322
 323             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 324                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
 325                 c = &connections[i];
 326                 break;
 327             }
 328
 329             assert( connections[i].c_struct_state == SLAP_C_USED );
 330             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 331             assert( ber_pvt_sb_in_use( connections[i].c_sb ));
 332         }
 333
 334         if( c == NULL ) {
 335                 Debug( LDAP_DEBUG_ANY,
 336                                 "connection_init(%d): connection table full (%d/%d).\n",
 337                                 s, i, dtblsize);
 338             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 339             return -1;
 340         }
 341     }
 342 #endif
 343
 344     assert( c != NULL );
 345     assert( c->c_struct_state != SLAP_C_USED );
 346     assert( c->c_conn_state == SLAP_C_INVALID );
 347
 348     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 349         c->c_dn = NULL;
 350         c->c_cdn = NULL;
 351
 352                 c->c_listener_url = NULL;
 353                 c->c_peer_domain = NULL;
 354         c->c_peer_name = NULL;
 355         c->c_sock_name = NULL;
 356
 357         c->c_ops = NULL;
 358         c->c_pending_ops = NULL;
 359                 c->c_authmech = NULL;
 360                 c->c_authstate = NULL;
 361
 362         c->c_sb = ber_sockbuf_alloc( );
 363
 364         /* should check status of thread calls */
 365         ldap_pvt_thread_mutex_init( &c->c_mutex );
 366         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 367         ldap_pvt_thread_cond_init( &c->c_write_cv );
 368
 369         c->c_struct_state = SLAP_C_UNUSED;
 370     }
 371
 372     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 373
 374     assert( c->c_struct_state == SLAP_C_UNUSED );
 375     assert(     c->c_dn == NULL );
 376     assert(     c->c_cdn == NULL );
 377     assert( c->c_listener_url == NULL );
 378     assert( c->c_peer_domain == NULL );
 379     assert( c->c_peer_name == NULL );
 380     assert( c->c_sock_name == NULL );
 381     assert( c->c_ops == NULL );
 382     assert( c->c_pending_ops == NULL );
 383         assert( c->c_authmech == NULL );
 384         assert( c->c_authstate == NULL );
 385
 386         c->c_listener_url = ch_strdup( url  );
 387         c->c_peer_domain = ch_strdup( dnsname  );
 388     c->c_peer_name = ch_strdup( peername  );
 389     c->c_sock_name = ch_strdup( sockname );
 390
 391     c->c_n_ops_received = 0;
 392     c->c_n_ops_executing = 0;
 393     c->c_n_ops_pending = 0;
 394     c->c_n_ops_completed = 0;
 395
 396         c->c_n_get = 0;
 397         c->c_n_read = 0;
 398         c->c_n_write = 0;
 399
 400     c->c_activitytime = c->c_starttime = slap_get_time();
 401
 402     ber_pvt_sb_set_desc( c->c_sb, s );
 403     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 404
 405     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 406         Debug( LDAP_DEBUG_ANY,
 407             "connection_init(%d, %s): set nonblocking failed\n",
 408             s, c->c_peer_name,0 );
 409     }
 410
 411     id = c->c_connid = conn_nextid++;
 412
 413     c->c_conn_state = SLAP_C_INACTIVE;
 414     c->c_struct_state = SLAP_C_USED;
 415
 416 #ifdef HAVE_TLS
 417     if ( use_tls ) {
 418             c->c_is_tls = 1;
 419             c->c_needs_tls_accept = 1;
 420     }
 421 #endif
 422
 423     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 424     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 425
 426     backend_connection_init(c);
 427
 428     return id;
 429 }
 430
 431 static void
 432 connection_destroy( Connection *c )
 433 {
 434         /* note: connections_mutex should be locked by caller */
 435
 436     assert( connections != NULL );
 437     assert( c != NULL );
 438     assert( c->c_struct_state != SLAP_C_UNUSED );
 439     assert( c->c_conn_state != SLAP_C_INVALID );
 440     assert( c->c_ops == NULL );
 441
 442     backend_connection_destroy(c);
 443
 444     c->c_protocol = 0;
 445     c->c_connid = -1;
 446
 447     c->c_activitytime = c->c_starttime = 0;
 448
 449     if(c->c_dn != NULL) {
 450         free(c->c_dn);
 451         c->c_dn = NULL;
 452     }
 453         if(c->c_cdn != NULL) {
 454                 free(c->c_cdn);
 455                 c->c_cdn = NULL;
 456         }
 457         if(c->c_listener_url != NULL) {
 458                 free(c->c_listener_url);
 459                 c->c_listener_url = NULL;
 460         }
 461         if(c->c_peer_domain != NULL) {
 462                 free(c->c_peer_domain);
 463                 c->c_peer_domain = NULL;
 464         }
 465         if(c->c_peer_name != NULL) {
 466                 free(c->c_peer_name);
 467                 c->c_peer_name = NULL;
 468         }
 469         if(c->c_sock_name != NULL) {
 470                 free(c->c_sock_name);
 471                 c->c_sock_name = NULL;
 472         }
 473         if(c->c_authmech != NULL ) {
 474                 free(c->c_authmech);
 475                 c->c_authmech = NULL;
 476         }
 477         if(c->c_authstate != NULL ) {
 478                 free(c->c_authstate);
 479                 c->c_authstate = NULL;
 480         }
 481
 482         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 483                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 484
 485                 slapd_remove( sd, 0 );
 486                 ber_pvt_sb_close( c->c_sb );
 487
 488                 Statslog( LDAP_DEBUG_STATS,
 489                     "conn=%d fd=%d closed.\n",
 490                         c->c_connid, sd, 0, 0, 0 );
 491         }
 492
 493         ber_pvt_sb_destroy( c->c_sb );
 494
 495     c->c_conn_state = SLAP_C_INVALID;
 496     c->c_struct_state = SLAP_C_UNUSED;
 497 }
 498
 499 int connection_state_closing( Connection *c )
 500 {
 501         /* c_mutex must be locked by caller */
 502
 503         int state;
 504         assert( c != NULL );
 505         assert( c->c_struct_state == SLAP_C_USED );
 506
 507         state = c->c_conn_state;
 508
 509         assert( state != SLAP_C_INVALID );
 510
 511         return state == SLAP_C_CLOSING;
 512 }
 513
 514 static void connection_abandon( Connection *c )
 515 {
 516         /* c_mutex must be locked by caller */
 517
 518         Operation *o;
 519
 520         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 521                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 522                 o->o_abandon = 1;
 523                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 524         }
 525
 526         /* remove pending operations */
 527         for( o = slap_op_pop( &c->c_pending_ops );
 528                 o != NULL;
 529                 o = slap_op_pop( &c->c_pending_ops ) )
 530         {
 531                 slap_op_free( o );
 532         }
 533 }
 534
 535 void connection_closing( Connection *c )
 536 {
 537         assert( connections != NULL );
 538         assert( c != NULL );
 539         assert( c->c_struct_state == SLAP_C_USED );
 540         assert( c->c_conn_state != SLAP_C_INVALID );
 541
 542         /* c_mutex must be locked by caller */
 543
 544         if( c->c_conn_state != SLAP_C_CLOSING ) {
 545
 546                 Debug( LDAP_DEBUG_TRACE,
 547                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 548                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 549
 550                 /* update state to closing */
 551                 c->c_conn_state = SLAP_C_CLOSING;
 552
 553                 /* don't listen on this port anymore */
 554                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 555
 556                 /* shutdown I/O -- not yet implemented */
 557
 558                 /* abandon active operations */
 559                 connection_abandon( c );
 560
 561                 /* wake write blocked operations */
 562                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 563                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 564         }
 565 }
 566
 567 static void connection_close( Connection *c )
 568 {
 569         assert( connections != NULL );
 570         assert( c != NULL );
 571         assert( c->c_struct_state == SLAP_C_USED );
 572         assert( c->c_conn_state == SLAP_C_CLOSING );
 573
 574         /* note: connections_mutex and c_mutex should be locked by caller */
 575
 576         if( c->c_ops != NULL ) {
 577                 Debug( LDAP_DEBUG_TRACE,
 578                         "connection_close: deferring conn=%ld sd=%d.\n",
 579                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 580
 581                 return;
 582         }
 583
 584         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 585                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 586
 587         connection_destroy( c );
 588 }
 589
 590 unsigned long connections_nextid(void)
 591 {
 592         unsigned long id;
 593         assert( connections != NULL );
 594
 595         ldap_pvt_thread_mutex_lock( &connections_mutex );
 596
 597         id = conn_nextid;
 598
 599         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 600
 601         return id;
 602 }
 603
 604 Connection* connection_first( ber_socket_t *index )
 605 {
 606         assert( connections != NULL );
 607         assert( index != NULL );
 608
 609         ldap_pvt_thread_mutex_lock( &connections_mutex );
 610
 611         *index = 0;
 612
 613         return connection_next(NULL, index);
 614 }
 615
 616 Connection* connection_next( Connection *c, ber_socket_t *index )
 617 {
 618         assert( connections != NULL );
 619         assert( index != NULL );
 620         assert( *index <= dtblsize );
 621
 622         if( c != NULL ) {
 623                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 624         }
 625
 626         c = NULL;
 627
 628         for(; *index < dtblsize; (*index)++) {
 629                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 630                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 631 #ifndef HAVE_WINSOCK
 632                         continue;
 633 #else
 634                         break;
 635 #endif
 636                 }
 637
 638                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 639                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 640                         c = &connections[(*index)++];
 641                         break;
 642                 }
 643
 644                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 645                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 646         }
 647
 648         if( c != NULL ) {
 649                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 650         }
 651
 652         return c;
 653 }
 654
 655 void connection_done( Connection *c )
 656 {
 657         assert( connections != NULL );
 658
 659         if( c != NULL ) {
 660                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 661         }
 662
 663         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 664 }
 665
 666 /*
 667  * connection_activity - handle the request operation op on connection
 668  * conn.  This routine figures out what kind of operation it is and
 669  * calls the appropriate stub to handle it.
 670  */
 671
 672 static void *
 673 connection_operation( void *arg_v )
 674 {
 675         int rc;
 676         struct co_arg   *arg = arg_v;
 677         ber_tag_t tag = arg->co_op->o_tag;
 678         Connection *conn = arg->co_conn;
 679
 680         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 681         num_ops_initiated++;
 682         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 683
 684         switch ( tag ) {
 685         case LDAP_REQ_BIND:
 686                 rc = do_bind( conn, arg->co_op );
 687                 break;
 688
 689         case LDAP_REQ_UNBIND:
 690                 rc = do_unbind( conn, arg->co_op );
 691                 break;
 692
 693         case LDAP_REQ_ADD:
 694                 rc = do_add( conn, arg->co_op );
 695                 break;
 696
 697         case LDAP_REQ_DELETE:
 698                 rc = do_delete( conn, arg->co_op );
 699                 break;
 700
 701         case LDAP_REQ_MODRDN:
 702                 rc = do_modrdn( conn, arg->co_op );
 703                 break;
 704
 705         case LDAP_REQ_MODIFY:
 706                 rc = do_modify( conn, arg->co_op );
 707                 break;
 708
 709         case LDAP_REQ_COMPARE:
 710                 rc = do_compare( conn, arg->co_op );
 711                 break;
 712
 713         case LDAP_REQ_SEARCH:
 714                 rc = do_search( conn, arg->co_op );
 715                 break;
 716
 717         case LDAP_REQ_ABANDON:
 718                 rc = do_abandon( conn, arg->co_op );
 719                 break;
 720
 721         case LDAP_REQ_EXTENDED:
 722                 rc = do_extended( conn, arg->co_op );
 723                 break;
 724
 725         default:
 726                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 727                     tag, 0, 0 );
 728                 arg->co_op->o_tag = LBER_ERROR;
 729                 send_ldap_disconnect( conn, arg->co_op,
 730                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 731                 rc = -1;
 732                 break;
 733         }
 734
 735         if( rc == -1 ) tag = LBER_ERROR;
 736
 737         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 738         num_ops_completed++;
 739         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 740
 741         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 742
 743         conn->c_n_ops_executing--;
 744         conn->c_n_ops_completed++;
 745
 746         slap_op_remove( &conn->c_ops, arg->co_op );
 747         slap_op_free( arg->co_op );
 748         arg->co_op = NULL;
 749         arg->co_conn = NULL;
 750         free( (char *) arg );
 751         arg = NULL;
 752
 753         switch( tag ) {
 754         case LBER_ERROR:
 755         case LDAP_REQ_UNBIND:
 756                 /* c_mutex is locked */
 757                 connection_closing( conn );
 758                 break;
 759
 760         case LDAP_REQ_BIND:
 761                 if( conn->c_conn_state == SLAP_C_BINDING) {
 762                         conn->c_conn_state = SLAP_C_ACTIVE;
 763                 }
 764                 conn->c_bind_in_progress = ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 765         }
 766
 767         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 768         active_threads--;
 769         if( active_threads < 1 ) {
 770                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 771         }
 772         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 773
 774         connection_resched( conn );
 775
 776         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 777
 778         return NULL;
 779 }
 780
 781 int connection_read(ber_socket_t s)
 782 {
 783         int rc = 0;
 784         Connection *c;
 785         assert( connections != NULL );
 786
 787         ldap_pvt_thread_mutex_lock( &connections_mutex );
 788
 789         /* get (locked) connection */
 790         c = connection_get( s );
 791
 792         if( c == NULL ) {
 793                 Debug( LDAP_DEBUG_ANY,
 794                         "connection_read(%ld): no connection!\n",
 795                         (long) s, 0, 0 );
 796
 797                 slapd_remove(s, 0);
 798
 799                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 800                 return -1;
 801         }
 802
 803         c->c_n_read++;
 804
 805         if( c->c_conn_state == SLAP_C_CLOSING ) {
 806                 Debug( LDAP_DEBUG_TRACE,
 807                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 808                         s, c->c_connid, 0 );
 809
 810                 connection_return( c );
 811                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 812                 return 0;
 813         }
 814
 815         Debug( LDAP_DEBUG_TRACE,
 816                 "connection_read(%d): checking for input on id=%ld\n",
 817                 s, c->c_connid, 0 );
 818
 819 #ifdef HAVE_TLS
 820         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 821                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 822                 if ( rc < 0 ) {
 823                         Debug( LDAP_DEBUG_TRACE,
 824                                "connection_read(%d): TLS accept error error=%d id=%ld, closing.\n",
 825                                s, rc, c->c_connid );
 826
 827                         c->c_needs_tls_accept = 0;
 828                         /* connections_mutex and c_mutex are locked */
 829                         connection_closing( c );
 830                         connection_close( c );
 831                 } else if ( rc == 0 ) {
 832                         c->c_needs_tls_accept = 0;
 833                 }
 834                 connection_return( c );
 835                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 836                 return 0;
 837         }
 838 #endif
 839
 840 #define CONNECTION_INPUT_LOOP 1
 841
 842 #ifdef DATA_READY_LOOP
 843         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 844 #elif CONNECTION_INPUT_LOOP
 845         while(!rc)
 846 #endif
 847         {
 848                 /* How do we do this without getting into a busy loop ? */
 849                 rc = connection_input( c );
 850         }
 851
 852         if( rc < 0 ) {
 853                 Debug( LDAP_DEBUG_TRACE,
 854                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 855                         s, rc, c->c_connid );
 856
 857                 /* connections_mutex and c_mutex are locked */
 858                 connection_closing( c );
 859                 connection_close( c );
 860         }
 861
 862         if ( ber_pvt_sb_needs_read( c->c_sb ) )
 863                 slapd_set_read( s, 1 );
 864         if ( ber_pvt_sb_needs_write( c->c_sb ) )
 865                 slapd_set_write( s, 1 );
 866         connection_return( c );
 867         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 868         return 0;
 869 }
 870
 871 static int
 872 connection_input(
 873     Connection *conn
 874 )
 875 {
 876         Operation *op;
 877         ber_tag_t       tag;
 878         ber_len_t       len;
 879         ber_int_t       msgid;
 880         BerElement      *ber;
 881
 882         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 883             == NULL ) {
 884                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 885                 return -1;
 886         }
 887
 888         errno = 0;
 889         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 890             != LDAP_TAG_MESSAGE )
 891         {
 892                 int err = errno;
 893
 894                 Debug( LDAP_DEBUG_TRACE,
 895                         "ber_get_next on fd %d failed errno %d (%s)\n",
 896                         ber_pvt_sb_get_desc( conn->c_sb ), err,
 897                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 898                 Debug( LDAP_DEBUG_TRACE,
 899                         "\t*** got %ld of %lu so far\n",
 900                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 901                         conn->c_currentber->ber_len, 0 );
 902
 903                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 904                         /* log, close and send error */
 905                         ber_free( conn->c_currentber, 1 );
 906                         conn->c_currentber = NULL;
 907
 908                         return -2;
 909                 }
 910                 return 1;
 911         }
 912
 913         ber = conn->c_currentber;
 914         conn->c_currentber = NULL;
 915
 916         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 917                 /* log, close and send error */
 918                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 919                     0 );
 920                 ber_free( ber, 1 );
 921                 return -1;
 922         }
 923
 924         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 925                 /* log, close and send error */
 926                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 927                     0 );
 928                 ber_free( ber, 1 );
 929
 930                 return -1;
 931         }
 932
 933         if(tag == LDAP_REQ_BIND) {
 934                 /* immediately abandon all exiting operations upon BIND */
 935                 connection_abandon( conn );
 936         }
 937
 938         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 939
 940         if ( conn->c_conn_state == SLAP_C_BINDING
 941                 || conn->c_conn_state == SLAP_C_CLOSING )
 942         {
 943                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 944                 conn->c_n_ops_pending++;
 945                 slap_op_add( &conn->c_pending_ops, op );
 946
 947         } else {
 948                 conn->c_n_ops_executing++;
 949                 connection_op_activate( conn, op );
 950         }
 951
 952 #ifdef NO_THREADS
 953         if ( conn->c_struct_state != SLAP_C_USED ) {
 954                 /* connection must have got closed underneath us */
 955                 return 1;
 956         }
 957 #endif
 958         assert( conn->c_struct_state == SLAP_C_USED );
 959
 960         return 0;
 961 }
 962
 963 static int
 964 connection_resched( Connection *conn )
 965 {
 966         Operation *op;
 967
 968         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 969                 Debug( LDAP_DEBUG_TRACE,
 970                         "connection_resched: attempting closing conn=%ld sd=%d.\n",
 971                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
 972
 973                 connection_close( conn );
 974                 return 0;
 975         }
 976
 977         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 978                 /* other states need different handling */
 979                 return 0;
 980         }
 981
 982         for( op = slap_op_pop( &conn->c_pending_ops );
 983                 op != NULL;
 984                 op = slap_op_pop( &conn->c_pending_ops ) )
 985         {
 986                 /* pending operations should not be marked for abandonment */
 987                 assert(!op->o_abandon);
 988
 989                 conn->c_n_ops_pending--;
 990                 conn->c_n_ops_executing++;
 991
 992                 connection_op_activate( conn, op );
 993
 994                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 995                         break;
 996                 }
 997         }
 998         return 0;
 999 }
1000
1001 static int connection_op_activate( Connection *conn, Operation *op )
1002 {
1003         struct co_arg *arg;
1004         char *tmpdn;
1005         int status;
1006         ber_tag_t tag = op->o_tag;
1007
1008         if(tag == LDAP_REQ_BIND) {
1009                 conn->c_conn_state = SLAP_C_BINDING;
1010         }
1011
1012         if ( conn->c_dn != NULL ) {
1013                 tmpdn = ch_strdup( conn->c_dn );
1014         } else {
1015                 tmpdn = NULL;
1016         }
1017
1018         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1019         arg->co_conn = conn;
1020         arg->co_op = op;
1021
1022         arg->co_op->o_bind_in_progress = conn->c_bind_in_progress;
1023
1024         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1025         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
1026
1027         arg->co_op->o_protocol = conn->c_protocol;
1028         arg->co_op->o_connid = conn->c_connid;
1029
1030         arg->co_op->o_authtype = conn->c_authtype;
1031         arg->co_op->o_authmech = conn->c_authmech != NULL
1032                 ?  ch_strdup( conn->c_authmech ) : NULL;
1033
1034         slap_op_add( &conn->c_ops, arg->co_op );
1035
1036         if( tmpdn != NULL ) {
1037                 free( tmpdn );
1038         }
1039
1040         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1041         active_threads++;
1042         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1043
1044         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
1045                                          connection_operation, (void *) arg );
1046
1047         if ( status != 0 ) {
1048                 Debug( LDAP_DEBUG_ANY,
1049                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1050
1051                 /* should move op to pending list */
1052         }
1053
1054         return status;
1055 }
1056
1057 int connection_write(ber_socket_t s)
1058 {
1059         Connection *c;
1060         assert( connections != NULL );
1061
1062         ldap_pvt_thread_mutex_lock( &connections_mutex );
1063
1064         c = connection_get( s );
1065
1066         slapd_clr_write( s, 0);
1067
1068         if( c == NULL ) {
1069                 Debug( LDAP_DEBUG_ANY,
1070                         "connection_write(%ld): no connection!\n",
1071                         (long) s, 0, 0 );
1072                 slapd_remove(s, 0);
1073                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1074                 return -1;
1075         }
1076
1077         c->c_n_write++;
1078
1079         Debug( LDAP_DEBUG_TRACE,
1080                 "connection_write(%d): waking output for id=%ld\n",
1081                 s, c->c_connid, 0 );
1082
1083         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1084
1085         if ( ber_pvt_sb_needs_read( c->c_sb ) )
1086                 slapd_set_read( s, 1 );
1087         if ( ber_pvt_sb_needs_write( c->c_sb ) )
1088                 slapd_set_write( s, 1 );
1089         connection_return( c );
1090         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1091         return 0;
1092 }