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

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