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

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