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

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6
   7 #include "portable.h"
   8
   9 #include <stdio.h>
  10
  11 #include <ac/socket.h>
  12 #include <ac/errno.h>
  13 #include <ac/signal.h>
  14 #include <ac/string.h>
  15 #include <ac/time.h>
  16
  17 #include "slap.h"
  18
  19 /* we need LBER internals */
  20 #include "../../libraries/liblber/lber-int.h"
  21
  22 /* protected by connections_mutex */
  23 static ldap_pvt_thread_mutex_t connections_mutex;
  24 static Connection *connections = NULL;
  25 static unsigned long conn_nextid = 0;
  26
  27 /* structure state (protected by connections_mutex) */
  28 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  29 #define SLAP_C_UNUSED                   0x01
  30 #define SLAP_C_USED                             0x02
  31
  32 /* connection state (protected by c_mutex ) */
  33 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  34 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  35 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  36 #define SLAP_C_BINDING                  0x03    /* binding */
  37 #define SLAP_C_CLOSING                  0x04    /* closing */
  38
  39 const char *
  40 connection_state2str( int state )
  41 {
  42         switch( state ) {
  43         case SLAP_C_INVALID:    return "!";
  44         case SLAP_C_INACTIVE:   return "|";
  45         case SLAP_C_ACTIVE:             return "";
  46         case SLAP_C_BINDING:    return "B";
  47         case SLAP_C_CLOSING:    return "C";
  48         }
  49
  50         return "?";
  51 }
  52
  53 static Connection* connection_get( ber_socket_t s );
  54
  55 static int connection_input( Connection *c );
  56 static void connection_close( Connection *c );
  57
  58 static int connection_op_activate( Connection *conn, Operation *op );
  59 static int connection_resched( Connection *conn );
  60 static void connection_abandon( Connection *conn );
  61 static void connection_destroy( Connection *c );
  62
  63 struct co_arg {
  64         Connection      *co_conn;
  65         Operation       *co_op;
  66 };
  67
  68 /*
  69  * Initialize connection management infrastructure.
  70  */
  71 int connections_init(void)
  72 {
  73         assert( connections == NULL );
  74
  75         if( connections != NULL) {
  76                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  77                         0, 0, 0 );
  78                 return -1;
  79         }
  80
  81         /* should check return of every call */
  82         ldap_pvt_thread_mutex_init( &connections_mutex );
  83
  84         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  85
  86         if( connections == NULL ) {
  87                 Debug( LDAP_DEBUG_ANY,
  88                         "connections_init: allocation (%d*%ld) of connection array failed\n",
  89                         dtblsize, (long) sizeof(Connection), 0 );
  90                 return -1;
  91         }
  92
  93     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  94     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  95
  96         /*
  97          * per entry initialization of the Connection array initialization
  98          * will be done by connection_init()
  99          */
 100
 101         return 0;
 102 }
 103
 104 /*
 105  * Destroy connection management infrastructure.
 106  */
 107 int connections_destroy(void)
 108 {
 109         ber_socket_t i;
 110
 111         /* should check return of every call */
 112
 113         if( connections == NULL) {
 114                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 115                         0, 0, 0 );
 116                 return -1;
 117         }
 118
 119         for ( i = 0; i < dtblsize; i++ ) {
 120                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 121                         ber_sockbuf_free( connections[i].c_sb );
 122                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 123                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 124                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 125                 }
 126         }
 127
 128         free( connections );
 129         connections = NULL;
 130
 131         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 132         return 0;
 133 }
 134
 135 /*
 136  * shutdown all connections
 137  */
 138 int connections_shutdown(void)
 139 {
 140         ber_socket_t i;
 141
 142         ldap_pvt_thread_mutex_lock( &connections_mutex );
 143
 144         for ( i = 0; i < dtblsize; i++ ) {
 145                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 146                         continue;
 147                 }
 148
 149                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 150
 151                 /* connections_mutex and c_mutex are locked */
 152                 connection_closing( &connections[i] );
 153                 connection_close( &connections[i] );
 154
 155                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 156         }
 157
 158         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 159
 160         return 0;
 161 }
 162
 163 /*
 164  * Timeout idle connections.
 165  */
 166 int connections_timeout_idle(time_t now)
 167 {
 168         int i = 0;
 169         int connindex;
 170         Connection* c;
 171
 172         ldap_pvt_thread_mutex_lock( &connections_mutex );
 173
 174         for( c = connection_first( &connindex );
 175                 c != NULL;
 176                 c = connection_next( c, &connindex ) )
 177         {
 178                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 179                         /* close it */
 180                         connection_closing( c );
 181                         connection_close( c );
 182                         i++;
 183                 }
 184         }
 185         connection_done( c );
 186
 187         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 188
 189         return i;
 190 }
 191
 192 static Connection* connection_get( ber_socket_t s )
 193 {
 194         /* connections_mutex should be locked by caller */
 195
 196         Connection *c;
 197
 198         Debug( LDAP_DEBUG_ARGS,
 199                 "connection_get(%ld)\n",
 200                 (long) s, 0, 0 );
 201
 202         assert( connections != NULL );
 203
 204         if(s == AC_SOCKET_INVALID) {
 205                 return NULL;
 206         }
 207
 208 #ifndef HAVE_WINSOCK
 209         c = &connections[s];
 210
 211         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 212
 213 #else
 214         c = NULL;
 215         {
 216                 ber_socket_t i;
 217
 218                 for(i=0; i<dtblsize; i++) {
 219                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 220                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 221                                 assert( connections[i].c_sb == 0 );
 222                                 break;
 223                         }
 224
 225                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 226                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 227                                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ) );
 228                                 continue;
 229                         }
 230
 231                         /* state can actually change from used -> unused by resched,
 232                          * so don't assert details here.
 233                          */
 234
 235                         if( ber_pvt_sb_get_desc( connections[i].c_sb ) == s ) {
 236                                 c = &connections[i];
 237                                 break;
 238                         }
 239                 }
 240         }
 241 #endif
 242
 243         if( c != NULL ) {
 244                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 245
 246                 if( c->c_struct_state != SLAP_C_USED ) {
 247                         /* connection must have been closed due to resched */
 248
 249                         assert( c->c_conn_state == SLAP_C_INVALID );
 250                         assert( !ber_pvt_sb_in_use( c->c_sb ) );
 251
 252                         Debug( LDAP_DEBUG_TRACE,
 253                                 "connection_get(%d): connection not used\n",
 254                                 s, 0, 0 );
 255
 256                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 257                         return NULL;
 258                 }
 259
 260                 Debug( LDAP_DEBUG_TRACE,
 261                         "connection_get(%d): got connid=%ld\n",
 262                         s, c->c_connid, 0 );
 263
 264                 c->c_n_get++;
 265
 266                 assert( c->c_struct_state == SLAP_C_USED );
 267                 assert( c->c_conn_state != SLAP_C_INVALID );
 268                 assert( ber_pvt_sb_in_use( c->c_sb ) );
 269
 270         c->c_activitytime = slap_get_time();
 271         }
 272
 273         return c;
 274 }
 275
 276 static void connection_return( Connection *c )
 277 {
 278         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 279 }
 280
 281 long connection_init(
 282         ber_socket_t s,
 283         const char* url,
 284         const char* dnsname,
 285         const char* peername,
 286         const char* sockname,
 287         int use_tls )
 288 {
 289         unsigned long id;
 290         Connection *c;
 291
 292         assert( connections != NULL );
 293
 294         assert( dnsname != NULL );
 295         assert( peername != NULL );
 296         assert( sockname != NULL );
 297
 298 #ifndef HAVE_TLS
 299         assert( !use_tls );
 300 #endif
 301
 302         if( s == AC_SOCKET_INVALID ) {
 303         Debug( LDAP_DEBUG_ANY,
 304                         "connection_init(%ld): invalid.\n",
 305                         (long) s, 0, 0 );
 306                 return -1;
 307         }
 308
 309         assert( s >= 0 );
 310 #ifndef HAVE_WINSOCK
 311         assert( s < dtblsize );
 312 #endif
 313
 314         ldap_pvt_thread_mutex_lock( &connections_mutex );
 315
 316 #ifndef HAVE_WINSOCK
 317         c = &connections[s];
 318
 319 #else
 320         {
 321                 unsigned int i;
 322
 323                 c = NULL;
 324
 325         for( i=0; i < dtblsize; i++) {
 326             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 327                 assert( connections[i].c_sb == 0 );
 328                 c = &connections[i];
 329                 break;
 330             }
 331
 332             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 333                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
 334                 c = &connections[i];
 335                 break;
 336             }
 337
 338             assert( connections[i].c_struct_state == SLAP_C_USED );
 339             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 340             assert( ber_pvt_sb_in_use( connections[i].c_sb ));
 341         }
 342
 343         if( c == NULL ) {
 344                 Debug( LDAP_DEBUG_ANY,
 345                                 "connection_init(%d): connection table full (%d/%d)\n",
 346                                 s, i, dtblsize);
 347             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 348             return -1;
 349         }
 350     }
 351 #endif
 352
 353     assert( c != NULL );
 354
 355     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 356         c->c_dn = NULL;
 357         c->c_cdn = NULL;
 358
 359                 c->c_listener_url = NULL;
 360                 c->c_peer_domain = NULL;
 361         c->c_peer_name = NULL;
 362         c->c_sock_name = NULL;
 363
 364         c->c_ops = NULL;
 365         c->c_pending_ops = NULL;
 366                 c->c_authmech = NULL;
 367                 c->c_authstate = NULL;
 368
 369 #ifdef HAVE_CYRUS_SASL
 370                 c->c_sasl_context = NULL;
 371 #endif
 372
 373         c->c_sb = ber_sockbuf_alloc( );
 374                 c->c_currentber = NULL;
 375
 376         /* should check status of thread calls */
 377         ldap_pvt_thread_mutex_init( &c->c_mutex );
 378         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 379         ldap_pvt_thread_cond_init( &c->c_write_cv );
 380
 381         c->c_struct_state = SLAP_C_UNUSED;
 382     }
 383
 384     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 385
 386     assert( c->c_struct_state == SLAP_C_UNUSED );
 387     assert(     c->c_dn == NULL );
 388     assert(     c->c_cdn == NULL );
 389     assert( c->c_listener_url == NULL );
 390     assert( c->c_peer_domain == NULL );
 391     assert( c->c_peer_name == NULL );
 392     assert( c->c_sock_name == NULL );
 393     assert( c->c_ops == NULL );
 394     assert( c->c_pending_ops == NULL );
 395         assert( c->c_authmech == NULL );
 396         assert( c->c_authstate == NULL );
 397 #ifdef HAVE_CYRUS_SASL
 398         assert( c->c_sasl_context == NULL );
 399 #endif
 400         assert( c->c_currentber == NULL );
 401
 402         c->c_listener_url = ch_strdup( url  );
 403         c->c_peer_domain = ch_strdup( dnsname  );
 404     c->c_peer_name = ch_strdup( peername  );
 405     c->c_sock_name = ch_strdup( sockname );
 406
 407     c->c_n_ops_received = 0;
 408     c->c_n_ops_executing = 0;
 409     c->c_n_ops_pending = 0;
 410     c->c_n_ops_completed = 0;
 411
 412         c->c_n_get = 0;
 413         c->c_n_read = 0;
 414         c->c_n_write = 0;
 415
 416         /* assume LDAPv3 until bind */
 417         c->c_protocol = LDAP_VERSION3;
 418
 419     c->c_activitytime = c->c_starttime = slap_get_time();
 420
 421     ber_pvt_sb_set_desc( c->c_sb, s );
 422     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 423
 424     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 425         Debug( LDAP_DEBUG_ANY,
 426             "connection_init(%d, %s): set nonblocking failed\n",
 427             s, c->c_peer_name,0 );
 428     }
 429
 430     id = c->c_connid = conn_nextid++;
 431
 432     c->c_conn_state = SLAP_C_INACTIVE;
 433     c->c_struct_state = SLAP_C_USED;
 434
 435 #ifdef HAVE_TLS
 436     if ( use_tls ) {
 437             c->c_is_tls = 1;
 438             c->c_needs_tls_accept = 1;
 439     }
 440 #endif
 441
 442     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 443     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 444
 445     backend_connection_init(c);
 446
 447     return id;
 448 }
 449
 450 static void
 451 connection_destroy( Connection *c )
 452 {
 453         /* note: connections_mutex should be locked by caller */
 454
 455     assert( connections != NULL );
 456     assert( c != NULL );
 457     assert( c->c_struct_state != SLAP_C_UNUSED );
 458     assert( c->c_conn_state != SLAP_C_INVALID );
 459     assert( c->c_ops == NULL );
 460
 461     backend_connection_destroy(c);
 462
 463     c->c_protocol = 0;
 464     c->c_connid = -1;
 465
 466     c->c_activitytime = c->c_starttime = 0;
 467
 468     if(c->c_dn != NULL) {
 469         free(c->c_dn);
 470         c->c_dn = NULL;
 471     }
 472         if(c->c_cdn != NULL) {
 473                 free(c->c_cdn);
 474                 c->c_cdn = NULL;
 475         }
 476         if(c->c_listener_url != NULL) {
 477                 free(c->c_listener_url);
 478                 c->c_listener_url = NULL;
 479         }
 480         if(c->c_peer_domain != NULL) {
 481                 free(c->c_peer_domain);
 482                 c->c_peer_domain = NULL;
 483         }
 484         if(c->c_peer_name != NULL) {
 485                 free(c->c_peer_name);
 486                 c->c_peer_name = NULL;
 487         }
 488         if(c->c_sock_name != NULL) {
 489                 free(c->c_sock_name);
 490                 c->c_sock_name = NULL;
 491         }
 492         if(c->c_authmech != NULL ) {
 493                 free(c->c_authmech);
 494                 c->c_authmech = NULL;
 495         }
 496         if(c->c_authstate != NULL ) {
 497                 free(c->c_authstate);
 498                 c->c_authstate = NULL;
 499         }
 500
 501 #ifdef HAVE_CYRUS_SASL
 502         if(c->c_sasl_context != NULL ) {
 503                 sasl_dispose( &c->c_sasl_context );
 504                 c->c_sasl_context = NULL;
 505         }
 506 #endif
 507
 508         if ( c->c_currentber != NULL ) {
 509                 ber_free( c->c_currentber, 1 );
 510                 c->c_currentber = NULL;
 511         }
 512
 513         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 514                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 515
 516                 slapd_remove( sd, 0 );
 517                 ber_pvt_sb_close( c->c_sb );
 518
 519                 Statslog( LDAP_DEBUG_STATS,
 520                     "conn=%ld fd=%d closed\n",
 521                         c->c_connid, sd, 0, 0, 0 );
 522         }
 523
 524         ber_pvt_sb_destroy( c->c_sb );
 525
 526     c->c_conn_state = SLAP_C_INVALID;
 527     c->c_struct_state = SLAP_C_UNUSED;
 528 }
 529
 530 int connection_state_closing( Connection *c )
 531 {
 532         /* c_mutex must be locked by caller */
 533
 534         int state;
 535         assert( c != NULL );
 536         assert( c->c_struct_state == SLAP_C_USED );
 537
 538         state = c->c_conn_state;
 539
 540         assert( state != SLAP_C_INVALID );
 541
 542         return state == SLAP_C_CLOSING;
 543 }
 544
 545 static void connection_abandon( Connection *c )
 546 {
 547         /* c_mutex must be locked by caller */
 548
 549         Operation *o;
 550
 551         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 552                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 553                 o->o_abandon = 1;
 554                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 555         }
 556
 557         /* remove pending operations */
 558         for( o = slap_op_pop( &c->c_pending_ops );
 559                 o != NULL;
 560                 o = slap_op_pop( &c->c_pending_ops ) )
 561         {
 562                 slap_op_free( o );
 563         }
 564 }
 565
 566 void connection_closing( Connection *c )
 567 {
 568         assert( connections != NULL );
 569         assert( c != NULL );
 570         assert( c->c_struct_state == SLAP_C_USED );
 571         assert( c->c_conn_state != SLAP_C_INVALID );
 572
 573         /* c_mutex must be locked by caller */
 574
 575         if( c->c_conn_state != SLAP_C_CLOSING ) {
 576
 577                 Debug( LDAP_DEBUG_TRACE,
 578                         "connection_closing: readying conn=%ld sd=%d for close\n",
 579                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 580
 581                 /* update state to closing */
 582                 c->c_conn_state = SLAP_C_CLOSING;
 583
 584                 /* don't listen on this port anymore */
 585                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 586
 587                 /* shutdown I/O -- not yet implemented */
 588
 589                 /* abandon active operations */
 590                 connection_abandon( c );
 591
 592                 /* wake write blocked operations */
 593                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 594                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 595         }
 596 }
 597
 598 static void connection_close( Connection *c )
 599 {
 600         assert( connections != NULL );
 601         assert( c != NULL );
 602         assert( c->c_struct_state == SLAP_C_USED );
 603         assert( c->c_conn_state == SLAP_C_CLOSING );
 604
 605         /* note: connections_mutex and c_mutex should be locked by caller */
 606
 607         if( c->c_ops != NULL ) {
 608                 Debug( LDAP_DEBUG_TRACE,
 609                         "connection_close: deferring conn=%ld sd=%d\n",
 610                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 611
 612                 return;
 613         }
 614
 615         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 616                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 617
 618         connection_destroy( c );
 619 }
 620
 621 unsigned long connections_nextid(void)
 622 {
 623         unsigned long id;
 624         assert( connections != NULL );
 625
 626         ldap_pvt_thread_mutex_lock( &connections_mutex );
 627
 628         id = conn_nextid;
 629
 630         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 631
 632         return id;
 633 }
 634
 635 Connection* connection_first( ber_socket_t *index )
 636 {
 637         assert( connections != NULL );
 638         assert( index != NULL );
 639
 640         ldap_pvt_thread_mutex_lock( &connections_mutex );
 641
 642         *index = 0;
 643
 644         return connection_next(NULL, index);
 645 }
 646
 647 Connection* connection_next( Connection *c, ber_socket_t *index )
 648 {
 649         assert( connections != NULL );
 650         assert( index != NULL );
 651         assert( *index <= dtblsize );
 652
 653         if( c != NULL ) {
 654                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 655         }
 656
 657         c = NULL;
 658
 659         for(; *index < dtblsize; (*index)++) {
 660                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 661                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 662 #ifndef HAVE_WINSOCK
 663                         continue;
 664 #else
 665                         break;
 666 #endif
 667                 }
 668
 669                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 670                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 671                         c = &connections[(*index)++];
 672                         break;
 673                 }
 674
 675                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 676                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 677         }
 678
 679         if( c != NULL ) {
 680                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 681         }
 682
 683         return c;
 684 }
 685
 686 void connection_done( Connection *c )
 687 {
 688         assert( connections != NULL );
 689
 690         if( c != NULL ) {
 691                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 692         }
 693
 694         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 695 }
 696
 697 /*
 698  * connection_activity - handle the request operation op on connection
 699  * conn.  This routine figures out what kind of operation it is and
 700  * calls the appropriate stub to handle it.
 701  */
 702
 703 static void *
 704 connection_operation( void *arg_v )
 705 {
 706         int rc;
 707         struct co_arg   *arg = arg_v;
 708         ber_tag_t tag = arg->co_op->o_tag;
 709         Connection *conn = arg->co_conn;
 710
 711         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 712         num_ops_initiated++;
 713         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 714
 715         switch ( tag ) {
 716         case LDAP_REQ_BIND:
 717                 rc = do_bind( conn, arg->co_op );
 718                 break;
 719
 720         case LDAP_REQ_UNBIND:
 721                 rc = do_unbind( conn, arg->co_op );
 722                 break;
 723
 724         case LDAP_REQ_ADD:
 725                 rc = do_add( conn, arg->co_op );
 726                 break;
 727
 728         case LDAP_REQ_DELETE:
 729                 rc = do_delete( conn, arg->co_op );
 730                 break;
 731
 732         case LDAP_REQ_MODRDN:
 733                 rc = do_modrdn( conn, arg->co_op );
 734                 break;
 735
 736         case LDAP_REQ_MODIFY:
 737                 rc = do_modify( conn, arg->co_op );
 738                 break;
 739
 740         case LDAP_REQ_COMPARE:
 741                 rc = do_compare( conn, arg->co_op );
 742                 break;
 743
 744         case LDAP_REQ_SEARCH:
 745                 rc = do_search( conn, arg->co_op );
 746                 break;
 747
 748         case LDAP_REQ_ABANDON:
 749                 rc = do_abandon( conn, arg->co_op );
 750                 break;
 751
 752         case LDAP_REQ_EXTENDED:
 753                 rc = do_extended( conn, arg->co_op );
 754                 break;
 755
 756         default:
 757                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 758                     tag, 0, 0 );
 759                 arg->co_op->o_tag = LBER_ERROR;
 760                 send_ldap_disconnect( conn, arg->co_op,
 761                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 762                 rc = -1;
 763                 break;
 764         }
 765
 766         if( rc == -1 ) tag = LBER_ERROR;
 767
 768         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 769         num_ops_completed++;
 770         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 771
 772         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 773
 774         conn->c_n_ops_executing--;
 775         conn->c_n_ops_completed++;
 776
 777         slap_op_remove( &conn->c_ops, arg->co_op );
 778         slap_op_free( arg->co_op );
 779         arg->co_op = NULL;
 780         arg->co_conn = NULL;
 781         free( (char *) arg );
 782         arg = NULL;
 783
 784         switch( tag ) {
 785         case LBER_ERROR:
 786         case LDAP_REQ_UNBIND:
 787                 /* c_mutex is locked */
 788                 connection_closing( conn );
 789                 break;
 790
 791         case LDAP_REQ_BIND:
 792                 if( conn->c_conn_state == SLAP_C_BINDING) {
 793                         conn->c_conn_state = SLAP_C_ACTIVE;
 794                 }
 795                 conn->c_bind_in_progress = ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 796         }
 797
 798         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 799         active_threads--;
 800         if( active_threads < 1 ) {
 801                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 802         }
 803         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 804
 805         connection_resched( conn );
 806
 807         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 808
 809         return NULL;
 810 }
 811
 812 int connection_read(ber_socket_t s)
 813 {
 814         int rc = 0;
 815         Connection *c;
 816         assert( connections != NULL );
 817
 818         ldap_pvt_thread_mutex_lock( &connections_mutex );
 819
 820         /* get (locked) connection */
 821         c = connection_get( s );
 822
 823         if( c == NULL ) {
 824                 Debug( LDAP_DEBUG_ANY,
 825                         "connection_read(%ld): no connection!\n",
 826                         (long) s, 0, 0 );
 827
 828                 slapd_remove(s, 0);
 829
 830                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 831                 return -1;
 832         }
 833
 834         c->c_n_read++;
 835
 836         if( c->c_conn_state == SLAP_C_CLOSING ) {
 837                 Debug( LDAP_DEBUG_TRACE,
 838                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 839                         s, c->c_connid, 0 );
 840
 841                 connection_return( c );
 842                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 843                 return 0;
 844         }
 845
 846         Debug( LDAP_DEBUG_TRACE,
 847                 "connection_read(%d): checking for input on id=%ld\n",
 848                 s, c->c_connid, 0 );
 849
 850 #ifdef HAVE_TLS
 851         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 852                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 853                 if ( rc < 0 ) {
 854                         Debug( LDAP_DEBUG_TRACE,
 855                                "connection_read(%d): TLS accept error error=%d id=%ld, closing\n",
 856                                s, rc, c->c_connid );
 857
 858                         c->c_needs_tls_accept = 0;
 859                         /* connections_mutex and c_mutex are locked */
 860                         connection_closing( c );
 861                         connection_close( c );
 862                 } else if ( rc == 0 ) {
 863                         c->c_needs_tls_accept = 0;
 864                 }
 865                 connection_return( c );
 866                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 867                 return 0;
 868         }
 869 #endif
 870
 871 #define CONNECTION_INPUT_LOOP 1
 872
 873 #ifdef DATA_READY_LOOP
 874         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 875 #elif CONNECTION_INPUT_LOOP
 876         while(!rc)
 877 #endif
 878         {
 879                 /* How do we do this without getting into a busy loop ? */
 880                 rc = connection_input( c );
 881         }
 882
 883         if( rc < 0 ) {
 884                 Debug( LDAP_DEBUG_TRACE,
 885                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 886                         s, rc, c->c_connid );
 887
 888                 /* connections_mutex and c_mutex are locked */
 889                 connection_closing( c );
 890                 connection_close( c );
 891         }
 892
 893         if ( ber_pvt_sb_needs_read( c->c_sb ) )
 894                 slapd_set_read( s, 1 );
 895         if ( ber_pvt_sb_needs_write( c->c_sb ) )
 896                 slapd_set_write( s, 1 );
 897         connection_return( c );
 898         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 899         return 0;
 900 }
 901
 902 static int
 903 connection_input(
 904     Connection *conn
 905 )
 906 {
 907         Operation *op;
 908         ber_tag_t       tag;
 909         ber_len_t       len;
 910         ber_int_t       msgid;
 911         BerElement      *ber;
 912
 913         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 914             == NULL ) {
 915                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 916                 return -1;
 917         }
 918
 919         errno = 0;
 920         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 921             != LDAP_TAG_MESSAGE )
 922         {
 923                 int err = errno;
 924
 925                 Debug( LDAP_DEBUG_TRACE,
 926                         "ber_get_next on fd %d failed errno=%d (%s)\n",
 927                         ber_pvt_sb_get_desc( conn->c_sb ), err, STRERROR(err) );
 928                 Debug( LDAP_DEBUG_TRACE,
 929                         "\t*** got %ld of %lu so far\n",
 930                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 931                         conn->c_currentber->ber_len, 0 );
 932
 933                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 934                         /* log, close and send error */
 935                         ber_free( conn->c_currentber, 1 );
 936                         conn->c_currentber = NULL;
 937
 938                         return -2;
 939                 }
 940                 return 1;
 941         }
 942
 943         ber = conn->c_currentber;
 944         conn->c_currentber = NULL;
 945
 946         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 947                 /* log, close and send error */
 948                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 949                     0 );
 950                 ber_free( ber, 1 );
 951                 return -1;
 952         }
 953
 954         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 955                 /* log, close and send error */
 956                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 957                     0 );
 958                 ber_free( ber, 1 );
 959
 960                 return -1;
 961         }
 962
 963         if(tag == LDAP_REQ_BIND) {
 964                 /* immediately abandon all exiting operations upon BIND */
 965                 connection_abandon( conn );
 966         }
 967
 968         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 969
 970         if ( conn->c_conn_state == SLAP_C_BINDING
 971                 || conn->c_conn_state == SLAP_C_CLOSING )
 972         {
 973                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 974                 conn->c_n_ops_pending++;
 975                 slap_op_add( &conn->c_pending_ops, op );
 976
 977         } else {
 978                 conn->c_n_ops_executing++;
 979                 connection_op_activate( conn, op );
 980         }
 981
 982 #ifdef NO_THREADS
 983         if ( conn->c_struct_state != SLAP_C_USED ) {
 984                 /* connection must have got closed underneath us */
 985                 return 1;
 986         }
 987 #endif
 988         assert( conn->c_struct_state == SLAP_C_USED );
 989
 990         return 0;
 991 }
 992
 993 static int
 994 connection_resched( Connection *conn )
 995 {
 996         Operation *op;
 997
 998         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 999                 Debug( LDAP_DEBUG_TRACE,
1000                         "connection_resched: attempting closing conn=%ld sd=%d\n",
1001                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
1002
1003                 connection_close( conn );
1004                 return 0;
1005         }
1006
1007         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1008                 /* other states need different handling */
1009                 return 0;
1010         }
1011
1012         for( op = slap_op_pop( &conn->c_pending_ops );
1013                 op != NULL;
1014                 op = slap_op_pop( &conn->c_pending_ops ) )
1015         {
1016                 /* pending operations should not be marked for abandonment */
1017                 assert(!op->o_abandon);
1018
1019                 conn->c_n_ops_pending--;
1020                 conn->c_n_ops_executing++;
1021
1022                 connection_op_activate( conn, op );
1023
1024                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1025                         break;
1026                 }
1027         }
1028         return 0;
1029 }
1030
1031 static int connection_op_activate( Connection *conn, Operation *op )
1032 {
1033         struct co_arg *arg;
1034         char *tmpdn;
1035         int status;
1036         ber_tag_t tag = op->o_tag;
1037
1038         if(tag == LDAP_REQ_BIND) {
1039                 conn->c_conn_state = SLAP_C_BINDING;
1040         }
1041
1042         if ( conn->c_dn != NULL ) {
1043                 tmpdn = ch_strdup( conn->c_dn );
1044         } else {
1045                 tmpdn = NULL;
1046         }
1047
1048         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1049         arg->co_conn = conn;
1050         arg->co_op = op;
1051
1052         arg->co_op->o_bind_in_progress = conn->c_bind_in_progress;
1053
1054         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1055         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1056         (void) dn_normalize( arg->co_op->o_ndn );
1057
1058         arg->co_op->o_protocol = conn->c_protocol;
1059         arg->co_op->o_connid = conn->c_connid;
1060
1061         arg->co_op->o_authtype = conn->c_authtype;
1062         arg->co_op->o_authmech = conn->c_authmech != NULL
1063                 ?  ch_strdup( conn->c_authmech ) : NULL;
1064
1065         slap_op_add( &conn->c_ops, arg->co_op );
1066
1067         if( tmpdn != NULL ) {
1068                 free( tmpdn );
1069         }
1070
1071         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1072         active_threads++;
1073         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1074
1075         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
1076                                          connection_operation, (void *) arg );
1077
1078         if ( status != 0 ) {
1079                 Debug( LDAP_DEBUG_ANY,
1080                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1081
1082                 /* should move op to pending list */
1083         }
1084
1085         return status;
1086 }
1087
1088 int connection_write(ber_socket_t s)
1089 {
1090         Connection *c;
1091         assert( connections != NULL );
1092
1093         ldap_pvt_thread_mutex_lock( &connections_mutex );
1094
1095         c = connection_get( s );
1096
1097         slapd_clr_write( s, 0);
1098
1099         if( c == NULL ) {
1100                 Debug( LDAP_DEBUG_ANY,
1101                         "connection_write(%ld): no connection!\n",
1102                         (long) s, 0, 0 );
1103                 slapd_remove(s, 0);
1104                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1105                 return -1;
1106         }
1107
1108         c->c_n_write++;
1109
1110         Debug( LDAP_DEBUG_TRACE,
1111                 "connection_write(%d): waking output for id=%ld\n",
1112                 s, c->c_connid, 0 );
1113
1114         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1115
1116         if ( ber_pvt_sb_needs_read( c->c_sb ) )
1117                 slapd_set_read( s, 1 );
1118         if ( ber_pvt_sb_needs_write( c->c_sb ) )
1119                 slapd_set_write( s, 1 );
1120         connection_return( c );
1121         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1122         return 0;
1123 }