git.sur5r.net Git - openldap/blob - servers/slapd/connection.c

   1 /*
   2  * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
   3  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   4  */
   5
   6 #include "portable.h"
   7
   8 #include <stdio.h>
   9
  10 #include <ac/socket.h>
  11 #include <ac/errno.h>
  12 #include <ac/signal.h>
  13 #include <ac/string.h>
  14 #include <ac/time.h>
  15
  16 #include "slap.h"
  17
  18 /* we need LBER internals */
  19 #include "../../libraries/liblber/lber-int.h"
  20
  21 /* protected by connections_mutex */
  22 static ldap_pvt_thread_mutex_t connections_mutex;
  23 static Connection *connections = NULL;
  24 static unsigned long conn_nextid = 0;
  25
  26 /* structure state (protected by connections_mutex) */
  27 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  28 #define SLAP_C_UNUSED                   0x01
  29 #define SLAP_C_USED                             0x02
  30
  31 /* connection state (protected by c_mutex ) */
  32 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  33 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  34 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  35 #define SLAP_C_BINDING                  0x03    /* binding */
  36 #define SLAP_C_CLOSING                  0x04    /* closing */
  37
  38 char* connection_state2str( int state ) {
  39         switch( state ) {
  40         case SLAP_C_INVALID:    return "!";
  41         case SLAP_C_INACTIVE:   return "|";
  42         case SLAP_C_ACTIVE:             return "";
  43         case SLAP_C_BINDING:    return "B";
  44         case SLAP_C_CLOSING:    return "C";
  45         }
  46
  47         return "?";
  48 }
  49
  50 static Connection* connection_get( ber_socket_t s );
  51
  52 static int connection_input( Connection *c );
  53 static void connection_close( Connection *c );
  54
  55 static int connection_op_activate( Connection *conn, Operation *op );
  56 static int connection_resched( Connection *conn );
  57 static void connection_abandon( Connection *conn );
  58 static void connection_destroy( Connection *c );
  59
  60 struct co_arg {
  61         Connection      *co_conn;
  62         Operation       *co_op;
  63 };
  64
  65 /*
  66  * Initialize connection management infrastructure.
  67  */
  68 int connections_init(void)
  69 {
  70         assert( connections == NULL );
  71
  72         if( connections != NULL) {
  73                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  74                         0, 0, 0 );
  75                 return -1;
  76         }
  77
  78         /* should check return of every call */
  79         ldap_pvt_thread_mutex_init( &connections_mutex );
  80
  81         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  82
  83         if( connections == NULL ) {
  84                 Debug( LDAP_DEBUG_ANY,
  85                         "connections_init: allocation (%d*%ld) of connection array failed.\n",
  86                         dtblsize, (long) sizeof(Connection), 0 );
  87                 return -1;
  88         }
  89
  90     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  91     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  92
  93         /*
  94          * per entry initialization of the Connection array initialization
  95          * will be done by connection_init()
  96          */
  97
  98         return 0;
  99 }
 100
 101 /*
 102  * Destroy connection management infrastructure.
 103  */
 104 int connections_destroy(void)
 105 {
 106         ber_socket_t i;
 107
 108         /* should check return of every call */
 109
 110         if( connections == NULL) {
 111                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 112                         0, 0, 0 );
 113                 return -1;
 114         }
 115
 116         for ( i = 0; i < dtblsize; i++ ) {
 117                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 118                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 119                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 120                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 121                 }
 122         }
 123
 124         free( connections );
 125         connections = NULL;
 126
 127         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 128         return 0;
 129 }
 130
 131 /*
 132  * shutdown all connections
 133  */
 134 int connections_shutdown(void)
 135 {
 136         ber_socket_t i;
 137
 138         ldap_pvt_thread_mutex_lock( &connections_mutex );
 139
 140         for ( i = 0; i < dtblsize; i++ ) {
 141                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 142                         continue;
 143                 }
 144
 145                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 146
 147                 /* connections_mutex and c_mutex are locked */
 148                 connection_closing( &connections[i] );
 149                 connection_close( &connections[i] );
 150
 151                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 152         }
 153
 154         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 155
 156         return 0;
 157 }
 158
 159 /*
 160  * Timeout idle connections.
 161  */
 162 int connections_timeout_idle(time_t now)
 163 {
 164         int i = 0;
 165         int connindex;
 166         Connection* c;
 167
 168         ldap_pvt_thread_mutex_lock( &connections_mutex );
 169
 170         for( c = connection_first( &connindex );
 171                 c != NULL;
 172                 c = connection_next( c, &connindex ) )
 173         {
 174                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 175                         /* close it */
 176                         connection_closing( c );
 177                         connection_close( c );
 178                         i++;
 179                 }
 180         }
 181         connection_done( c );
 182
 183         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 184
 185         return i;
 186 }
 187
 188 static Connection* connection_get( ber_socket_t s )
 189 {
 190         /* connections_mutex should be locked by caller */
 191
 192         Connection *c;
 193
 194         Debug( LDAP_DEBUG_ARGS,
 195                 "connection_get(%ld)\n",
 196                 (long) s, 0, 0 );
 197
 198         assert( connections != NULL );
 199
 200         if(s == AC_SOCKET_INVALID) {
 201                 return NULL;
 202         }
 203
 204 #ifndef HAVE_WINSOCK
 205         c = &connections[s];
 206
 207         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 208
 209 #else
 210         c = NULL;
 211         {
 212                 ber_socket_t i;
 213
 214                 for(i=0; i<dtblsize; i++) {
 215                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 216                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 217                                 assert( connections[i].c_sb == 0 );
 218                                 break;
 219                         }
 220
 221                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 222                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 223                                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ) );
 224                                 continue;
 225                         }
 226
 227                         /* state can actually change from used -> unused by resched,
 228                          * so don't assert details here.
 229                          */
 230
 231                         if( ber_pvt_sb_get_desc( connections[i].c_sb ) == s ) {
 232                                 c = &connections[i];
 233                                 break;
 234                         }
 235                 }
 236         }
 237 #endif
 238
 239         if( c != NULL ) {
 240                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 241
 242                 if( c->c_struct_state != SLAP_C_USED ) {
 243                         /* connection must have been closed due to resched */
 244
 245                         assert( c->c_conn_state == SLAP_C_INVALID );
 246                         assert( !ber_pvt_sb_in_use( c->c_sb ) );
 247
 248                         Debug( LDAP_DEBUG_TRACE,
 249                                 "connection_get(%d): connection not used.\n",
 250                                 s, c->c_connid, 0 );
 251
 252                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 253                         return NULL;
 254                 }
 255
 256                 Debug( LDAP_DEBUG_TRACE,
 257                         "connection_get(%d): got connid=%ld\n",
 258                         s, c->c_connid, 0 );
 259
 260                 c->c_n_get++;
 261
 262                 assert( c->c_struct_state == SLAP_C_USED );
 263                 assert( c->c_conn_state != SLAP_C_INVALID );
 264                 assert( ber_pvt_sb_in_use( c->c_sb ) );
 265
 266         c->c_activitytime = slap_get_time();
 267         }
 268
 269         return c;
 270 }
 271
 272 static void connection_return( Connection *c )
 273 {
 274         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 275 }
 276
 277 long connection_init(
 278         ber_socket_t s,
 279         const char* url,
 280         const char* dnsname,
 281         const char* peername,
 282         const char* sockname,
 283         int use_tls )
 284 {
 285         unsigned long id;
 286         Connection *c;
 287
 288         assert( connections != NULL );
 289
 290         assert( dnsname != NULL );
 291         assert( peername != NULL );
 292         assert( sockname != NULL );
 293
 294 #ifndef HAVE_TLS
 295         assert( !use_tls );
 296 #endif
 297
 298         if( s == AC_SOCKET_INVALID ) {
 299         Debug( LDAP_DEBUG_ANY,
 300                         "connection_init(%ld): invalid.\n",
 301                         (long) s, 0, 0 );
 302                 return -1;
 303         }
 304
 305         assert( s >= 0 );
 306 #ifndef HAVE_WINSOCK
 307         assert( s < dtblsize );
 308 #endif
 309
 310         ldap_pvt_thread_mutex_lock( &connections_mutex );
 311
 312 #ifndef HAVE_WINSOCK
 313         c = &connections[s];
 314
 315 #else
 316         {
 317                 unsigned int i;
 318
 319                 c = NULL;
 320
 321         for( i=0; i < dtblsize; i++) {
 322             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 323                 assert( connections[i].c_sb == 0 );
 324                 c = &connections[i];
 325                 break;
 326             }
 327
 328             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 329                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
 330                 c = &connections[i];
 331                 break;
 332             }
 333
 334             assert( connections[i].c_struct_state == SLAP_C_USED );
 335             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 336             assert( ber_pvt_sb_in_use( connections[i].c_sb ));
 337         }
 338
 339         if( c == NULL ) {
 340                 Debug( LDAP_DEBUG_ANY,
 341                                 "connection_init(%d): connection table full (%d/%d).\n",
 342                                 s, i, dtblsize);
 343             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 344             return -1;
 345         }
 346     }
 347 #endif
 348
 349     assert( c != NULL );
 350     assert( c->c_struct_state != SLAP_C_USED );
 351     assert( c->c_conn_state == SLAP_C_INVALID );
 352
 353     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 354         c->c_dn = NULL;
 355         c->c_cdn = NULL;
 356
 357                 c->c_listener_url = NULL;
 358                 c->c_peer_domain = NULL;
 359         c->c_peer_name = NULL;
 360         c->c_sock_name = NULL;
 361
 362         c->c_ops = NULL;
 363         c->c_pending_ops = NULL;
 364                 c->c_authmech = NULL;
 365                 c->c_authstate = NULL;
 366
 367 #ifdef HAVE_CYRUS_SASL
 368                 c->c_sasl_context = NULL;
 369 #endif
 370
 371         c->c_sb = ber_sockbuf_alloc( );
 372
 373         /* should check status of thread calls */
 374         ldap_pvt_thread_mutex_init( &c->c_mutex );
 375         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 376         ldap_pvt_thread_cond_init( &c->c_write_cv );
 377
 378         c->c_struct_state = SLAP_C_UNUSED;
 379     }
 380
 381     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 382
 383     assert( c->c_struct_state == SLAP_C_UNUSED );
 384     assert(     c->c_dn == NULL );
 385     assert(     c->c_cdn == NULL );
 386     assert( c->c_listener_url == NULL );
 387     assert( c->c_peer_domain == NULL );
 388     assert( c->c_peer_name == NULL );
 389     assert( c->c_sock_name == NULL );
 390     assert( c->c_ops == NULL );
 391     assert( c->c_pending_ops == NULL );
 392         assert( c->c_authmech == NULL );
 393         assert( c->c_authstate == NULL );
 394 #ifdef HAVE_CYRUS_SASL
 395         assert( c->c_sasl_context == NULL );
 396 #endif
 397
 398         c->c_listener_url = ch_strdup( url  );
 399         c->c_peer_domain = ch_strdup( dnsname  );
 400     c->c_peer_name = ch_strdup( peername  );
 401     c->c_sock_name = ch_strdup( sockname );
 402
 403     c->c_n_ops_received = 0;
 404     c->c_n_ops_executing = 0;
 405     c->c_n_ops_pending = 0;
 406     c->c_n_ops_completed = 0;
 407
 408         c->c_n_get = 0;
 409         c->c_n_read = 0;
 410         c->c_n_write = 0;
 411
 412     c->c_activitytime = c->c_starttime = slap_get_time();
 413
 414     ber_pvt_sb_set_desc( c->c_sb, s );
 415     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 416
 417     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 418         Debug( LDAP_DEBUG_ANY,
 419             "connection_init(%d, %s): set nonblocking failed\n",
 420             s, c->c_peer_name,0 );
 421     }
 422
 423     id = c->c_connid = conn_nextid++;
 424
 425     c->c_conn_state = SLAP_C_INACTIVE;
 426     c->c_struct_state = SLAP_C_USED;
 427
 428 #ifdef HAVE_TLS
 429     if ( use_tls ) {
 430             c->c_is_tls = 1;
 431             c->c_needs_tls_accept = 1;
 432     }
 433 #endif
 434
 435     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 436     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 437
 438     backend_connection_init(c);
 439
 440     return id;
 441 }
 442
 443 static void
 444 connection_destroy( Connection *c )
 445 {
 446         /* note: connections_mutex should be locked by caller */
 447
 448     assert( connections != NULL );
 449     assert( c != NULL );
 450     assert( c->c_struct_state != SLAP_C_UNUSED );
 451     assert( c->c_conn_state != SLAP_C_INVALID );
 452     assert( c->c_ops == NULL );
 453
 454     backend_connection_destroy(c);
 455
 456     c->c_protocol = 0;
 457     c->c_connid = -1;
 458
 459     c->c_activitytime = c->c_starttime = 0;
 460
 461     if(c->c_dn != NULL) {
 462         free(c->c_dn);
 463         c->c_dn = NULL;
 464     }
 465         if(c->c_cdn != NULL) {
 466                 free(c->c_cdn);
 467                 c->c_cdn = NULL;
 468         }
 469         if(c->c_listener_url != NULL) {
 470                 free(c->c_listener_url);
 471                 c->c_listener_url = NULL;
 472         }
 473         if(c->c_peer_domain != NULL) {
 474                 free(c->c_peer_domain);
 475                 c->c_peer_domain = NULL;
 476         }
 477         if(c->c_peer_name != NULL) {
 478                 free(c->c_peer_name);
 479                 c->c_peer_name = NULL;
 480         }
 481         if(c->c_sock_name != NULL) {
 482                 free(c->c_sock_name);
 483                 c->c_sock_name = NULL;
 484         }
 485         if(c->c_authmech != NULL ) {
 486                 free(c->c_authmech);
 487                 c->c_authmech = NULL;
 488         }
 489         if(c->c_authstate != NULL ) {
 490                 free(c->c_authstate);
 491                 c->c_authstate = NULL;
 492         }
 493
 494 #ifdef HAVE_CYRUS_SASL
 495         if(c->c_sasl_context != NULL ) {
 496                 sasl_dispose( &c->c_sasl_context );
 497                 c->c_sasl_context = NULL;
 498         }
 499 #endif
 500
 501         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 502                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 503
 504                 slapd_remove( sd, 0 );
 505                 ber_pvt_sb_close( c->c_sb );
 506
 507                 Statslog( LDAP_DEBUG_STATS,
 508                     "conn=%ld fd=%d closed.\n",
 509                         c->c_connid, sd, 0, 0, 0 );
 510         }
 511
 512         ber_pvt_sb_destroy( c->c_sb );
 513
 514     c->c_conn_state = SLAP_C_INVALID;
 515     c->c_struct_state = SLAP_C_UNUSED;
 516 }
 517
 518 int connection_state_closing( Connection *c )
 519 {
 520         /* c_mutex must be locked by caller */
 521
 522         int state;
 523         assert( c != NULL );
 524         assert( c->c_struct_state == SLAP_C_USED );
 525
 526         state = c->c_conn_state;
 527
 528         assert( state != SLAP_C_INVALID );
 529
 530         return state == SLAP_C_CLOSING;
 531 }
 532
 533 static void connection_abandon( Connection *c )
 534 {
 535         /* c_mutex must be locked by caller */
 536
 537         Operation *o;
 538
 539         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 540                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 541                 o->o_abandon = 1;
 542                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 543         }
 544
 545         /* remove pending operations */
 546         for( o = slap_op_pop( &c->c_pending_ops );
 547                 o != NULL;
 548                 o = slap_op_pop( &c->c_pending_ops ) )
 549         {
 550                 slap_op_free( o );
 551         }
 552 }
 553
 554 void connection_closing( Connection *c )
 555 {
 556         assert( connections != NULL );
 557         assert( c != NULL );
 558         assert( c->c_struct_state == SLAP_C_USED );
 559         assert( c->c_conn_state != SLAP_C_INVALID );
 560
 561         /* c_mutex must be locked by caller */
 562
 563         if( c->c_conn_state != SLAP_C_CLOSING ) {
 564
 565                 Debug( LDAP_DEBUG_TRACE,
 566                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 567                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 568
 569                 /* update state to closing */
 570                 c->c_conn_state = SLAP_C_CLOSING;
 571
 572                 /* don't listen on this port anymore */
 573                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 574
 575                 /* shutdown I/O -- not yet implemented */
 576
 577                 /* abandon active operations */
 578                 connection_abandon( c );
 579
 580                 /* wake write blocked operations */
 581                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 582                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 583         }
 584 }
 585
 586 static void connection_close( Connection *c )
 587 {
 588         assert( connections != NULL );
 589         assert( c != NULL );
 590         assert( c->c_struct_state == SLAP_C_USED );
 591         assert( c->c_conn_state == SLAP_C_CLOSING );
 592
 593         /* note: connections_mutex and c_mutex should be locked by caller */
 594
 595         if( c->c_ops != NULL ) {
 596                 Debug( LDAP_DEBUG_TRACE,
 597                         "connection_close: deferring conn=%ld sd=%d.\n",
 598                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 599
 600                 return;
 601         }
 602
 603         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 604                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 605
 606         connection_destroy( c );
 607 }
 608
 609 unsigned long connections_nextid(void)
 610 {
 611         unsigned long id;
 612         assert( connections != NULL );
 613
 614         ldap_pvt_thread_mutex_lock( &connections_mutex );
 615
 616         id = conn_nextid;
 617
 618         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 619
 620         return id;
 621 }
 622
 623 Connection* connection_first( ber_socket_t *index )
 624 {
 625         assert( connections != NULL );
 626         assert( index != NULL );
 627
 628         ldap_pvt_thread_mutex_lock( &connections_mutex );
 629
 630         *index = 0;
 631
 632         return connection_next(NULL, index);
 633 }
 634
 635 Connection* connection_next( Connection *c, ber_socket_t *index )
 636 {
 637         assert( connections != NULL );
 638         assert( index != NULL );
 639         assert( *index <= dtblsize );
 640
 641         if( c != NULL ) {
 642                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 643         }
 644
 645         c = NULL;
 646
 647         for(; *index < dtblsize; (*index)++) {
 648                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 649                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 650 #ifndef HAVE_WINSOCK
 651                         continue;
 652 #else
 653                         break;
 654 #endif
 655                 }
 656
 657                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 658                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 659                         c = &connections[(*index)++];
 660                         break;
 661                 }
 662
 663                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 664                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 665         }
 666
 667         if( c != NULL ) {
 668                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 669         }
 670
 671         return c;
 672 }
 673
 674 void connection_done( Connection *c )
 675 {
 676         assert( connections != NULL );
 677
 678         if( c != NULL ) {
 679                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 680         }
 681
 682         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 683 }
 684
 685 /*
 686  * connection_activity - handle the request operation op on connection
 687  * conn.  This routine figures out what kind of operation it is and
 688  * calls the appropriate stub to handle it.
 689  */
 690
 691 static void *
 692 connection_operation( void *arg_v )
 693 {
 694         int rc;
 695         struct co_arg   *arg = arg_v;
 696         ber_tag_t tag = arg->co_op->o_tag;
 697         Connection *conn = arg->co_conn;
 698
 699         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 700         num_ops_initiated++;
 701         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 702
 703         switch ( tag ) {
 704         case LDAP_REQ_BIND:
 705                 rc = do_bind( conn, arg->co_op );
 706                 break;
 707
 708         case LDAP_REQ_UNBIND:
 709                 rc = do_unbind( conn, arg->co_op );
 710                 break;
 711
 712         case LDAP_REQ_ADD:
 713                 rc = do_add( conn, arg->co_op );
 714                 break;
 715
 716         case LDAP_REQ_DELETE:
 717                 rc = do_delete( conn, arg->co_op );
 718                 break;
 719
 720         case LDAP_REQ_MODRDN:
 721                 rc = do_modrdn( conn, arg->co_op );
 722                 break;
 723
 724         case LDAP_REQ_MODIFY:
 725                 rc = do_modify( conn, arg->co_op );
 726                 break;
 727
 728         case LDAP_REQ_COMPARE:
 729                 rc = do_compare( conn, arg->co_op );
 730                 break;
 731
 732         case LDAP_REQ_SEARCH:
 733                 rc = do_search( conn, arg->co_op );
 734                 break;
 735
 736         case LDAP_REQ_ABANDON:
 737                 rc = do_abandon( conn, arg->co_op );
 738                 break;
 739
 740         case LDAP_REQ_EXTENDED:
 741                 rc = do_extended( conn, arg->co_op );
 742                 break;
 743
 744         default:
 745                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 746                     tag, 0, 0 );
 747                 arg->co_op->o_tag = LBER_ERROR;
 748                 send_ldap_disconnect( conn, arg->co_op,
 749                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 750                 rc = -1;
 751                 break;
 752         }
 753
 754         if( rc == -1 ) tag = LBER_ERROR;
 755
 756         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 757         num_ops_completed++;
 758         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 759
 760         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 761
 762         conn->c_n_ops_executing--;
 763         conn->c_n_ops_completed++;
 764
 765         slap_op_remove( &conn->c_ops, arg->co_op );
 766         slap_op_free( arg->co_op );
 767         arg->co_op = NULL;
 768         arg->co_conn = NULL;
 769         free( (char *) arg );
 770         arg = NULL;
 771
 772         switch( tag ) {
 773         case LBER_ERROR:
 774         case LDAP_REQ_UNBIND:
 775                 /* c_mutex is locked */
 776                 connection_closing( conn );
 777                 break;
 778
 779         case LDAP_REQ_BIND:
 780                 if( conn->c_conn_state == SLAP_C_BINDING) {
 781                         conn->c_conn_state = SLAP_C_ACTIVE;
 782                 }
 783                 conn->c_bind_in_progress = ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 784         }
 785
 786         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 787         active_threads--;
 788         if( active_threads < 1 ) {
 789                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 790         }
 791         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 792
 793         connection_resched( conn );
 794
 795         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 796
 797         return NULL;
 798 }
 799
 800 int connection_read(ber_socket_t s)
 801 {
 802         int rc = 0;
 803         Connection *c;
 804         assert( connections != NULL );
 805
 806         ldap_pvt_thread_mutex_lock( &connections_mutex );
 807
 808         /* get (locked) connection */
 809         c = connection_get( s );
 810
 811         if( c == NULL ) {
 812                 Debug( LDAP_DEBUG_ANY,
 813                         "connection_read(%ld): no connection!\n",
 814                         (long) s, 0, 0 );
 815
 816                 slapd_remove(s, 0);
 817
 818                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 819                 return -1;
 820         }
 821
 822         c->c_n_read++;
 823
 824         if( c->c_conn_state == SLAP_C_CLOSING ) {
 825                 Debug( LDAP_DEBUG_TRACE,
 826                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 827                         s, c->c_connid, 0 );
 828
 829                 connection_return( c );
 830                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 831                 return 0;
 832         }
 833
 834         Debug( LDAP_DEBUG_TRACE,
 835                 "connection_read(%d): checking for input on id=%ld\n",
 836                 s, c->c_connid, 0 );
 837
 838 #ifdef HAVE_TLS
 839         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 840                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 841                 if ( rc < 0 ) {
 842                         Debug( LDAP_DEBUG_TRACE,
 843                                "connection_read(%d): TLS accept error error=%d id=%ld, closing.\n",
 844                                s, rc, c->c_connid );
 845
 846                         c->c_needs_tls_accept = 0;
 847                         /* connections_mutex and c_mutex are locked */
 848                         connection_closing( c );
 849                         connection_close( c );
 850                 } else if ( rc == 0 ) {
 851                         c->c_needs_tls_accept = 0;
 852                 }
 853                 connection_return( c );
 854                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 855                 return 0;
 856         }
 857 #endif
 858
 859 #define CONNECTION_INPUT_LOOP 1
 860
 861 #ifdef DATA_READY_LOOP
 862         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 863 #elif CONNECTION_INPUT_LOOP
 864         while(!rc)
 865 #endif
 866         {
 867                 /* How do we do this without getting into a busy loop ? */
 868                 rc = connection_input( c );
 869         }
 870
 871         if( rc < 0 ) {
 872                 Debug( LDAP_DEBUG_TRACE,
 873                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 874                         s, rc, c->c_connid );
 875
 876                 /* connections_mutex and c_mutex are locked */
 877                 connection_closing( c );
 878                 connection_close( c );
 879         }
 880
 881         if ( ber_pvt_sb_needs_read( c->c_sb ) )
 882                 slapd_set_read( s, 1 );
 883         if ( ber_pvt_sb_needs_write( c->c_sb ) )
 884                 slapd_set_write( s, 1 );
 885         connection_return( c );
 886         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 887         return 0;
 888 }
 889
 890 static int
 891 connection_input(
 892     Connection *conn
 893 )
 894 {
 895         Operation *op;
 896         ber_tag_t       tag;
 897         ber_len_t       len;
 898         ber_int_t       msgid;
 899         BerElement      *ber;
 900
 901         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 902             == NULL ) {
 903                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 904                 return -1;
 905         }
 906
 907         errno = 0;
 908         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 909             != LDAP_TAG_MESSAGE )
 910         {
 911                 int err = errno;
 912
 913                 Debug( LDAP_DEBUG_TRACE,
 914                         "ber_get_next on fd %d failed errno %d (%s)\n",
 915                         ber_pvt_sb_get_desc( conn->c_sb ), err,
 916                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 917                 Debug( LDAP_DEBUG_TRACE,
 918                         "\t*** got %ld of %lu so far\n",
 919                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 920                         conn->c_currentber->ber_len, 0 );
 921
 922                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 923                         /* log, close and send error */
 924                         ber_free( conn->c_currentber, 1 );
 925                         conn->c_currentber = NULL;
 926
 927                         return -2;
 928                 }
 929                 return 1;
 930         }
 931
 932         ber = conn->c_currentber;
 933         conn->c_currentber = NULL;
 934
 935         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 936                 /* log, close and send error */
 937                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 938                     0 );
 939                 ber_free( ber, 1 );
 940                 return -1;
 941         }
 942
 943         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 944                 /* log, close and send error */
 945                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 946                     0 );
 947                 ber_free( ber, 1 );
 948
 949                 return -1;
 950         }
 951
 952         if(tag == LDAP_REQ_BIND) {
 953                 /* immediately abandon all exiting operations upon BIND */
 954                 connection_abandon( conn );
 955         }
 956
 957         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 958
 959         if ( conn->c_conn_state == SLAP_C_BINDING
 960                 || conn->c_conn_state == SLAP_C_CLOSING )
 961         {
 962                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 963                 conn->c_n_ops_pending++;
 964                 slap_op_add( &conn->c_pending_ops, op );
 965
 966         } else {
 967                 conn->c_n_ops_executing++;
 968                 connection_op_activate( conn, op );
 969         }
 970
 971 #ifdef NO_THREADS
 972         if ( conn->c_struct_state != SLAP_C_USED ) {
 973                 /* connection must have got closed underneath us */
 974                 return 1;
 975         }
 976 #endif
 977         assert( conn->c_struct_state == SLAP_C_USED );
 978
 979         return 0;
 980 }
 981
 982 static int
 983 connection_resched( Connection *conn )
 984 {
 985         Operation *op;
 986
 987         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 988                 Debug( LDAP_DEBUG_TRACE,
 989                         "connection_resched: attempting closing conn=%ld sd=%d.\n",
 990                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
 991
 992                 connection_close( conn );
 993                 return 0;
 994         }
 995
 996         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 997                 /* other states need different handling */
 998                 return 0;
 999         }
1000
1001         for( op = slap_op_pop( &conn->c_pending_ops );
1002                 op != NULL;
1003                 op = slap_op_pop( &conn->c_pending_ops ) )
1004         {
1005                 /* pending operations should not be marked for abandonment */
1006                 assert(!op->o_abandon);
1007
1008                 conn->c_n_ops_pending--;
1009                 conn->c_n_ops_executing++;
1010
1011                 connection_op_activate( conn, op );
1012
1013                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1014                         break;
1015                 }
1016         }
1017         return 0;
1018 }
1019
1020 static int connection_op_activate( Connection *conn, Operation *op )
1021 {
1022         struct co_arg *arg;
1023         char *tmpdn;
1024         int status;
1025         ber_tag_t tag = op->o_tag;
1026
1027         if(tag == LDAP_REQ_BIND) {
1028                 conn->c_conn_state = SLAP_C_BINDING;
1029         }
1030
1031         if ( conn->c_dn != NULL ) {
1032                 tmpdn = ch_strdup( conn->c_dn );
1033         } else {
1034                 tmpdn = NULL;
1035         }
1036
1037         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1038         arg->co_conn = conn;
1039         arg->co_op = op;
1040
1041         arg->co_op->o_bind_in_progress = conn->c_bind_in_progress;
1042
1043         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1044         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1045         (void) dn_normalize_case( arg->co_op->o_ndn );
1046
1047         arg->co_op->o_protocol = conn->c_protocol;
1048         arg->co_op->o_connid = conn->c_connid;
1049
1050         arg->co_op->o_authtype = conn->c_authtype;
1051         arg->co_op->o_authmech = conn->c_authmech != NULL
1052                 ?  ch_strdup( conn->c_authmech ) : NULL;
1053
1054         slap_op_add( &conn->c_ops, arg->co_op );
1055
1056         if( tmpdn != NULL ) {
1057                 free( tmpdn );
1058         }
1059
1060         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1061         active_threads++;
1062         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1063
1064         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
1065                                          connection_operation, (void *) arg );
1066
1067         if ( status != 0 ) {
1068                 Debug( LDAP_DEBUG_ANY,
1069                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1070
1071                 /* should move op to pending list */
1072         }
1073
1074         return status;
1075 }
1076
1077 int connection_write(ber_socket_t s)
1078 {
1079         Connection *c;
1080         assert( connections != NULL );
1081
1082         ldap_pvt_thread_mutex_lock( &connections_mutex );
1083
1084         c = connection_get( s );
1085
1086         slapd_clr_write( s, 0);
1087
1088         if( c == NULL ) {
1089                 Debug( LDAP_DEBUG_ANY,
1090                         "connection_write(%ld): no connection!\n",
1091                         (long) s, 0, 0 );
1092                 slapd_remove(s, 0);
1093                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1094                 return -1;
1095         }
1096
1097         c->c_n_write++;
1098
1099         Debug( LDAP_DEBUG_TRACE,
1100                 "connection_write(%d): waking output for id=%ld\n",
1101                 s, c->c_connid, 0 );
1102
1103         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1104
1105         if ( ber_pvt_sb_needs_read( c->c_sb ) )
1106                 slapd_set_read( s, 1 );
1107         if ( ber_pvt_sb_needs_write( c->c_sb ) )
1108                 slapd_set_write( s, 1 );
1109         connection_return( c );
1110         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1111         return 0;
1112 }