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