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 #ifdef HAVE_CYRUS_SASL
 363                 c->c_sasl_context = NULL;
 364 #endif
 365
 366         c->c_sb = ber_sockbuf_alloc( );
 367
 368         /* should check status of thread calls */
 369         ldap_pvt_thread_mutex_init( &c->c_mutex );
 370         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 371         ldap_pvt_thread_cond_init( &c->c_write_cv );
 372
 373         c->c_struct_state = SLAP_C_UNUSED;
 374     }
 375
 376     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 377
 378     assert( c->c_struct_state == SLAP_C_UNUSED );
 379     assert(     c->c_dn == NULL );
 380     assert(     c->c_cdn == NULL );
 381     assert( c->c_listener_url == NULL );
 382     assert( c->c_peer_domain == NULL );
 383     assert( c->c_peer_name == NULL );
 384     assert( c->c_sock_name == NULL );
 385     assert( c->c_ops == NULL );
 386     assert( c->c_pending_ops == NULL );
 387         assert( c->c_authmech == NULL );
 388         assert( c->c_authstate == NULL );
 389 #ifdef HAVE_CYRUS_SASL
 390         assert( c->c_sasl_context == NULL );
 391 #endif
 392
 393         c->c_listener_url = ch_strdup( url  );
 394         c->c_peer_domain = ch_strdup( dnsname  );
 395     c->c_peer_name = ch_strdup( peername  );
 396     c->c_sock_name = ch_strdup( sockname );
 397
 398     c->c_n_ops_received = 0;
 399     c->c_n_ops_executing = 0;
 400     c->c_n_ops_pending = 0;
 401     c->c_n_ops_completed = 0;
 402
 403         c->c_n_get = 0;
 404         c->c_n_read = 0;
 405         c->c_n_write = 0;
 406
 407     c->c_activitytime = c->c_starttime = slap_get_time();
 408
 409     ber_pvt_sb_set_desc( c->c_sb, s );
 410     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 411
 412     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 413         Debug( LDAP_DEBUG_ANY,
 414             "connection_init(%d, %s): set nonblocking failed\n",
 415             s, c->c_peer_name,0 );
 416     }
 417
 418     id = c->c_connid = conn_nextid++;
 419
 420     c->c_conn_state = SLAP_C_INACTIVE;
 421     c->c_struct_state = SLAP_C_USED;
 422
 423 #ifdef HAVE_TLS
 424     if ( use_tls ) {
 425             c->c_is_tls = 1;
 426             c->c_needs_tls_accept = 1;
 427     }
 428 #endif
 429
 430     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 431     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 432
 433     backend_connection_init(c);
 434
 435     return id;
 436 }
 437
 438 static void
 439 connection_destroy( Connection *c )
 440 {
 441         /* note: connections_mutex should be locked by caller */
 442
 443     assert( connections != NULL );
 444     assert( c != NULL );
 445     assert( c->c_struct_state != SLAP_C_UNUSED );
 446     assert( c->c_conn_state != SLAP_C_INVALID );
 447     assert( c->c_ops == NULL );
 448
 449     backend_connection_destroy(c);
 450
 451     c->c_protocol = 0;
 452     c->c_connid = -1;
 453
 454     c->c_activitytime = c->c_starttime = 0;
 455
 456     if(c->c_dn != NULL) {
 457         free(c->c_dn);
 458         c->c_dn = NULL;
 459     }
 460         if(c->c_cdn != NULL) {
 461                 free(c->c_cdn);
 462                 c->c_cdn = NULL;
 463         }
 464         if(c->c_listener_url != NULL) {
 465                 free(c->c_listener_url);
 466                 c->c_listener_url = NULL;
 467         }
 468         if(c->c_peer_domain != NULL) {
 469                 free(c->c_peer_domain);
 470                 c->c_peer_domain = NULL;
 471         }
 472         if(c->c_peer_name != NULL) {
 473                 free(c->c_peer_name);
 474                 c->c_peer_name = NULL;
 475         }
 476         if(c->c_sock_name != NULL) {
 477                 free(c->c_sock_name);
 478                 c->c_sock_name = NULL;
 479         }
 480         if(c->c_authmech != NULL ) {
 481                 free(c->c_authmech);
 482                 c->c_authmech = NULL;
 483         }
 484         if(c->c_authstate != NULL ) {
 485                 free(c->c_authstate);
 486                 c->c_authstate = NULL;
 487         }
 488
 489 #ifdef HAVE_CYRUS_SASL
 490         if(c->c_sasl_context != NULL ) {
 491                 sasl_dispose( &c->c_sasl_context );
 492                 c->c_sasl_context = NULL;
 493         }
 494 #endif
 495
 496         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 497                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 498
 499                 slapd_remove( sd, 0 );
 500                 ber_pvt_sb_close( c->c_sb );
 501
 502                 Statslog( LDAP_DEBUG_STATS,
 503                     "conn=%d fd=%d closed.\n",
 504                         c->c_connid, sd, 0, 0, 0 );
 505         }
 506
 507         ber_pvt_sb_destroy( c->c_sb );
 508
 509     c->c_conn_state = SLAP_C_INVALID;
 510     c->c_struct_state = SLAP_C_UNUSED;
 511 }
 512
 513 int connection_state_closing( Connection *c )
 514 {
 515         /* c_mutex must be locked by caller */
 516
 517         int state;
 518         assert( c != NULL );
 519         assert( c->c_struct_state == SLAP_C_USED );
 520
 521         state = c->c_conn_state;
 522
 523         assert( state != SLAP_C_INVALID );
 524
 525         return state == SLAP_C_CLOSING;
 526 }
 527
 528 static void connection_abandon( Connection *c )
 529 {
 530         /* c_mutex must be locked by caller */
 531
 532         Operation *o;
 533
 534         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 535                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 536                 o->o_abandon = 1;
 537                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 538         }
 539
 540         /* remove pending operations */
 541         for( o = slap_op_pop( &c->c_pending_ops );
 542                 o != NULL;
 543                 o = slap_op_pop( &c->c_pending_ops ) )
 544         {
 545                 slap_op_free( o );
 546         }
 547 }
 548
 549 void connection_closing( Connection *c )
 550 {
 551         assert( connections != NULL );
 552         assert( c != NULL );
 553         assert( c->c_struct_state == SLAP_C_USED );
 554         assert( c->c_conn_state != SLAP_C_INVALID );
 555
 556         /* c_mutex must be locked by caller */
 557
 558         if( c->c_conn_state != SLAP_C_CLOSING ) {
 559
 560                 Debug( LDAP_DEBUG_TRACE,
 561                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 562                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 563
 564                 /* update state to closing */
 565                 c->c_conn_state = SLAP_C_CLOSING;
 566
 567                 /* don't listen on this port anymore */
 568                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 569
 570                 /* shutdown I/O -- not yet implemented */
 571
 572                 /* abandon active operations */
 573                 connection_abandon( c );
 574
 575                 /* wake write blocked operations */
 576                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 577                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 578         }
 579 }
 580
 581 static void connection_close( Connection *c )
 582 {
 583         assert( connections != NULL );
 584         assert( c != NULL );
 585         assert( c->c_struct_state == SLAP_C_USED );
 586         assert( c->c_conn_state == SLAP_C_CLOSING );
 587
 588         /* note: connections_mutex and c_mutex should be locked by caller */
 589
 590         if( c->c_ops != NULL ) {
 591                 Debug( LDAP_DEBUG_TRACE,
 592                         "connection_close: deferring conn=%ld sd=%d.\n",
 593                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 594
 595                 return;
 596         }
 597
 598         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 599                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 600
 601         connection_destroy( c );
 602 }
 603
 604 unsigned long connections_nextid(void)
 605 {
 606         unsigned long id;
 607         assert( connections != NULL );
 608
 609         ldap_pvt_thread_mutex_lock( &connections_mutex );
 610
 611         id = conn_nextid;
 612
 613         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 614
 615         return id;
 616 }
 617
 618 Connection* connection_first( ber_socket_t *index )
 619 {
 620         assert( connections != NULL );
 621         assert( index != NULL );
 622
 623         ldap_pvt_thread_mutex_lock( &connections_mutex );
 624
 625         *index = 0;
 626
 627         return connection_next(NULL, index);
 628 }
 629
 630 Connection* connection_next( Connection *c, ber_socket_t *index )
 631 {
 632         assert( connections != NULL );
 633         assert( index != NULL );
 634         assert( *index <= dtblsize );
 635
 636         if( c != NULL ) {
 637                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 638         }
 639
 640         c = NULL;
 641
 642         for(; *index < dtblsize; (*index)++) {
 643                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 644                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 645 #ifndef HAVE_WINSOCK
 646                         continue;
 647 #else
 648                         break;
 649 #endif
 650                 }
 651
 652                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 653                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 654                         c = &connections[(*index)++];
 655                         break;
 656                 }
 657
 658                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 659                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 660         }
 661
 662         if( c != NULL ) {
 663                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 664         }
 665
 666         return c;
 667 }
 668
 669 void connection_done( Connection *c )
 670 {
 671         assert( connections != NULL );
 672
 673         if( c != NULL ) {
 674                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 675         }
 676
 677         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 678 }
 679
 680 /*
 681  * connection_activity - handle the request operation op on connection
 682  * conn.  This routine figures out what kind of operation it is and
 683  * calls the appropriate stub to handle it.
 684  */
 685
 686 static void *
 687 connection_operation( void *arg_v )
 688 {
 689         int rc;
 690         struct co_arg   *arg = arg_v;
 691         ber_tag_t tag = arg->co_op->o_tag;
 692         Connection *conn = arg->co_conn;
 693
 694         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 695         num_ops_initiated++;
 696         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 697
 698         switch ( tag ) {
 699         case LDAP_REQ_BIND:
 700                 rc = do_bind( conn, arg->co_op );
 701                 break;
 702
 703         case LDAP_REQ_UNBIND:
 704                 rc = do_unbind( conn, arg->co_op );
 705                 break;
 706
 707         case LDAP_REQ_ADD:
 708                 rc = do_add( conn, arg->co_op );
 709                 break;
 710
 711         case LDAP_REQ_DELETE:
 712                 rc = do_delete( conn, arg->co_op );
 713                 break;
 714
 715         case LDAP_REQ_MODRDN:
 716                 rc = do_modrdn( conn, arg->co_op );
 717                 break;
 718
 719         case LDAP_REQ_MODIFY:
 720                 rc = do_modify( conn, arg->co_op );
 721                 break;
 722
 723         case LDAP_REQ_COMPARE:
 724                 rc = do_compare( conn, arg->co_op );
 725                 break;
 726
 727         case LDAP_REQ_SEARCH:
 728                 rc = do_search( conn, arg->co_op );
 729                 break;
 730
 731         case LDAP_REQ_ABANDON:
 732                 rc = do_abandon( conn, arg->co_op );
 733                 break;
 734
 735         case LDAP_REQ_EXTENDED:
 736                 rc = do_extended( conn, arg->co_op );
 737                 break;
 738
 739         default:
 740                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 741                     tag, 0, 0 );
 742                 arg->co_op->o_tag = LBER_ERROR;
 743                 send_ldap_disconnect( conn, arg->co_op,
 744                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 745                 rc = -1;
 746                 break;
 747         }
 748
 749         if( rc == -1 ) tag = LBER_ERROR;
 750
 751         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 752         num_ops_completed++;
 753         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 754
 755         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 756
 757         conn->c_n_ops_executing--;
 758         conn->c_n_ops_completed++;
 759
 760         slap_op_remove( &conn->c_ops, arg->co_op );
 761         slap_op_free( arg->co_op );
 762         arg->co_op = NULL;
 763         arg->co_conn = NULL;
 764         free( (char *) arg );
 765         arg = NULL;
 766
 767         switch( tag ) {
 768         case LBER_ERROR:
 769         case LDAP_REQ_UNBIND:
 770                 /* c_mutex is locked */
 771                 connection_closing( conn );
 772                 break;
 773
 774         case LDAP_REQ_BIND:
 775                 if( conn->c_conn_state == SLAP_C_BINDING) {
 776                         conn->c_conn_state = SLAP_C_ACTIVE;
 777                 }
 778                 conn->c_bind_in_progress = ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 779         }
 780
 781         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 782         active_threads--;
 783         if( active_threads < 1 ) {
 784                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 785         }
 786         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 787
 788         connection_resched( conn );
 789
 790         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 791
 792         return NULL;
 793 }
 794
 795 int connection_read(ber_socket_t s)
 796 {
 797         int rc = 0;
 798         Connection *c;
 799         assert( connections != NULL );
 800
 801         ldap_pvt_thread_mutex_lock( &connections_mutex );
 802
 803         /* get (locked) connection */
 804         c = connection_get( s );
 805
 806         if( c == NULL ) {
 807                 Debug( LDAP_DEBUG_ANY,
 808                         "connection_read(%ld): no connection!\n",
 809                         (long) s, 0, 0 );
 810
 811                 slapd_remove(s, 0);
 812
 813                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 814                 return -1;
 815         }
 816
 817         c->c_n_read++;
 818
 819         if( c->c_conn_state == SLAP_C_CLOSING ) {
 820                 Debug( LDAP_DEBUG_TRACE,
 821                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 822                         s, c->c_connid, 0 );
 823
 824                 connection_return( c );
 825                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 826                 return 0;
 827         }
 828
 829         Debug( LDAP_DEBUG_TRACE,
 830                 "connection_read(%d): checking for input on id=%ld\n",
 831                 s, c->c_connid, 0 );
 832
 833 #ifdef HAVE_TLS
 834         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 835                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 836                 if ( rc < 0 ) {
 837                         Debug( LDAP_DEBUG_TRACE,
 838                                "connection_read(%d): TLS accept error error=%d id=%ld, closing.\n",
 839                                s, rc, c->c_connid );
 840
 841                         c->c_needs_tls_accept = 0;
 842                         /* connections_mutex and c_mutex are locked */
 843                         connection_closing( c );
 844                         connection_close( c );
 845                 } else if ( rc == 0 ) {
 846                         c->c_needs_tls_accept = 0;
 847                 }
 848                 connection_return( c );
 849                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 850                 return 0;
 851         }
 852 #endif
 853
 854 #define CONNECTION_INPUT_LOOP 1
 855
 856 #ifdef DATA_READY_LOOP
 857         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 858 #elif CONNECTION_INPUT_LOOP
 859         while(!rc)
 860 #endif
 861         {
 862                 /* How do we do this without getting into a busy loop ? */
 863                 rc = connection_input( c );
 864         }
 865
 866         if( rc < 0 ) {
 867                 Debug( LDAP_DEBUG_TRACE,
 868                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 869                         s, rc, c->c_connid );
 870
 871                 /* connections_mutex and c_mutex are locked */
 872                 connection_closing( c );
 873                 connection_close( c );
 874         }
 875
 876         if ( ber_pvt_sb_needs_read( c->c_sb ) )
 877                 slapd_set_read( s, 1 );
 878         if ( ber_pvt_sb_needs_write( c->c_sb ) )
 879                 slapd_set_write( s, 1 );
 880         connection_return( c );
 881         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 882         return 0;
 883 }
 884
 885 static int
 886 connection_input(
 887     Connection *conn
 888 )
 889 {
 890         Operation *op;
 891         ber_tag_t       tag;
 892         ber_len_t       len;
 893         ber_int_t       msgid;
 894         BerElement      *ber;
 895
 896         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 897             == NULL ) {
 898                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 899                 return -1;
 900         }
 901
 902         errno = 0;
 903         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 904             != LDAP_TAG_MESSAGE )
 905         {
 906                 int err = errno;
 907
 908                 Debug( LDAP_DEBUG_TRACE,
 909                         "ber_get_next on fd %d failed errno %d (%s)\n",
 910                         ber_pvt_sb_get_desc( conn->c_sb ), err,
 911                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 912                 Debug( LDAP_DEBUG_TRACE,
 913                         "\t*** got %ld of %lu so far\n",
 914                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 915                         conn->c_currentber->ber_len, 0 );
 916
 917                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 918                         /* log, close and send error */
 919                         ber_free( conn->c_currentber, 1 );
 920                         conn->c_currentber = NULL;
 921
 922                         return -2;
 923                 }
 924                 return 1;
 925         }
 926
 927         ber = conn->c_currentber;
 928         conn->c_currentber = NULL;
 929
 930         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 931                 /* log, close and send error */
 932                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 933                     0 );
 934                 ber_free( ber, 1 );
 935                 return -1;
 936         }
 937
 938         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 939                 /* log, close and send error */
 940                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 941                     0 );
 942                 ber_free( ber, 1 );
 943
 944                 return -1;
 945         }
 946
 947         if(tag == LDAP_REQ_BIND) {
 948                 /* immediately abandon all exiting operations upon BIND */
 949                 connection_abandon( conn );
 950         }
 951
 952         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 953
 954         if ( conn->c_conn_state == SLAP_C_BINDING
 955                 || conn->c_conn_state == SLAP_C_CLOSING )
 956         {
 957                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 958                 conn->c_n_ops_pending++;
 959                 slap_op_add( &conn->c_pending_ops, op );
 960
 961         } else {
 962                 conn->c_n_ops_executing++;
 963                 connection_op_activate( conn, op );
 964         }
 965
 966 #ifdef NO_THREADS
 967         if ( conn->c_struct_state != SLAP_C_USED ) {
 968                 /* connection must have got closed underneath us */
 969                 return 1;
 970         }
 971 #endif
 972         assert( conn->c_struct_state == SLAP_C_USED );
 973
 974         return 0;
 975 }
 976
 977 static int
 978 connection_resched( Connection *conn )
 979 {
 980         Operation *op;
 981
 982         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 983                 Debug( LDAP_DEBUG_TRACE,
 984                         "connection_resched: attempting closing conn=%ld sd=%d.\n",
 985                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
 986
 987                 connection_close( conn );
 988                 return 0;
 989         }
 990
 991         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 992                 /* other states need different handling */
 993                 return 0;
 994         }
 995
 996         for( op = slap_op_pop( &conn->c_pending_ops );
 997                 op != NULL;
 998                 op = slap_op_pop( &conn->c_pending_ops ) )
 999         {
1000                 /* pending operations should not be marked for abandonment */
1001                 assert(!op->o_abandon);
1002
1003                 conn->c_n_ops_pending--;
1004                 conn->c_n_ops_executing++;
1005
1006                 connection_op_activate( conn, op );
1007
1008                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1009                         break;
1010                 }
1011         }
1012         return 0;
1013 }
1014
1015 static int connection_op_activate( Connection *conn, Operation *op )
1016 {
1017         struct co_arg *arg;
1018         char *tmpdn;
1019         int status;
1020         ber_tag_t tag = op->o_tag;
1021
1022         if(tag == LDAP_REQ_BIND) {
1023                 conn->c_conn_state = SLAP_C_BINDING;
1024         }
1025
1026         if ( conn->c_dn != NULL ) {
1027                 tmpdn = ch_strdup( conn->c_dn );
1028         } else {
1029                 tmpdn = NULL;
1030         }
1031
1032         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1033         arg->co_conn = conn;
1034         arg->co_op = op;
1035
1036         arg->co_op->o_bind_in_progress = conn->c_bind_in_progress;
1037
1038         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1039         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1040         (void) dn_normalize_case( arg->co_op->o_ndn );
1041
1042         arg->co_op->o_protocol = conn->c_protocol;
1043         arg->co_op->o_connid = conn->c_connid;
1044
1045         arg->co_op->o_authtype = conn->c_authtype;
1046         arg->co_op->o_authmech = conn->c_authmech != NULL
1047                 ?  ch_strdup( conn->c_authmech ) : NULL;
1048
1049         slap_op_add( &conn->c_ops, arg->co_op );
1050
1051         if( tmpdn != NULL ) {
1052                 free( tmpdn );
1053         }
1054
1055         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1056         active_threads++;
1057         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1058
1059         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
1060                                          connection_operation, (void *) arg );
1061
1062         if ( status != 0 ) {
1063                 Debug( LDAP_DEBUG_ANY,
1064                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1065
1066                 /* should move op to pending list */
1067         }
1068
1069         return status;
1070 }
1071
1072 int connection_write(ber_socket_t s)
1073 {
1074         Connection *c;
1075         assert( connections != NULL );
1076
1077         ldap_pvt_thread_mutex_lock( &connections_mutex );
1078
1079         c = connection_get( s );
1080
1081         slapd_clr_write( s, 0);
1082
1083         if( c == NULL ) {
1084                 Debug( LDAP_DEBUG_ANY,
1085                         "connection_write(%ld): no connection!\n",
1086                         (long) s, 0, 0 );
1087                 slapd_remove(s, 0);
1088                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1089                 return -1;
1090         }
1091
1092         c->c_n_write++;
1093
1094         Debug( LDAP_DEBUG_TRACE,
1095                 "connection_write(%d): waking output for id=%ld\n",
1096                 s, c->c_connid, 0 );
1097
1098         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1099
1100         if ( ber_pvt_sb_needs_read( c->c_sb ) )
1101                 slapd_set_read( s, 1 );
1102         if ( ber_pvt_sb_needs_write( c->c_sb ) )
1103                 slapd_set_write( s, 1 );
1104         connection_return( c );
1105         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1106         return 0;
1107 }