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

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6
   7 #include "portable.h"
   8
   9 #include <stdio.h>
  10 #include <limits.h>
  11
  12 #include <ac/socket.h>
  13 #include <ac/errno.h>
  14 #include <ac/signal.h>
  15 #include <ac/string.h>
  16 #include <ac/time.h>
  17
  18 #include "ldap_pvt.h"
  19
  20 #include "slap.h"
  21
  22 /* protected by connections_mutex */
  23 static ldap_pvt_thread_mutex_t connections_mutex;
  24 static Connection *connections = NULL;
  25 static unsigned long conn_nextid = 0;
  26
  27 /* structure state (protected by connections_mutex) */
  28 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  29 #define SLAP_C_UNUSED                   0x01
  30 #define SLAP_C_USED                             0x02
  31
  32 /* connection state (protected by c_mutex ) */
  33 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  34 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  35 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  36 #define SLAP_C_BINDING                  0x03    /* binding */
  37 #define SLAP_C_CLOSING                  0x04    /* closing */
  38
  39 const char *
  40 connection_state2str( int state )
  41 {
  42         switch( state ) {
  43         case SLAP_C_INVALID:    return "!";
  44         case SLAP_C_INACTIVE:   return "|";
  45         case SLAP_C_ACTIVE:             return "";
  46         case SLAP_C_BINDING:    return "B";
  47         case SLAP_C_CLOSING:    return "C";
  48         }
  49
  50         return "?";
  51 }
  52
  53 static Connection* connection_get( ber_socket_t s );
  54
  55 static int connection_input( Connection *c );
  56 static void connection_close( Connection *c );
  57
  58 static int connection_op_activate( Connection *conn, Operation *op );
  59 static int connection_resched( Connection *conn );
  60 static void connection_abandon( Connection *conn );
  61 static void connection_destroy( Connection *c );
  62
  63 struct co_arg {
  64         Connection      *co_conn;
  65         Operation       *co_op;
  66 };
  67
  68 /*
  69  * Initialize connection management infrastructure.
  70  */
  71 int connections_init(void)
  72 {
  73         assert( connections == NULL );
  74
  75         if( connections != NULL) {
  76                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  77                         0, 0, 0 );
  78                 return -1;
  79         }
  80
  81         /* should check return of every call */
  82         ldap_pvt_thread_mutex_init( &connections_mutex );
  83
  84         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  85
  86         if( connections == NULL ) {
  87                 Debug( LDAP_DEBUG_ANY,
  88                         "connections_init: allocation (%d*%ld) of connection array failed\n",
  89                         dtblsize, (long) sizeof(Connection), 0 );
  90                 return -1;
  91         }
  92
  93     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  94     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  95
  96         /*
  97          * per entry initialization of the Connection array initialization
  98          * will be done by connection_init()
  99          */
 100
 101         return 0;
 102 }
 103
 104 /*
 105  * Destroy connection management infrastructure.
 106  */
 107 int connections_destroy(void)
 108 {
 109         ber_socket_t i;
 110
 111         /* should check return of every call */
 112
 113         if( connections == NULL) {
 114                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 115                         0, 0, 0 );
 116                 return -1;
 117         }
 118
 119         for ( i = 0; i < dtblsize; i++ ) {
 120                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 121                         ber_sockbuf_free( connections[i].c_sb );
 122                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 123                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 124                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 125                 }
 126         }
 127
 128         free( connections );
 129         connections = NULL;
 130
 131         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 132         return 0;
 133 }
 134
 135 /*
 136  * shutdown all connections
 137  */
 138 int connections_shutdown(void)
 139 {
 140         ber_socket_t i;
 141
 142         ldap_pvt_thread_mutex_lock( &connections_mutex );
 143
 144         for ( i = 0; i < dtblsize; i++ ) {
 145                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 146                         continue;
 147                 }
 148
 149                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 150
 151                 /* connections_mutex and c_mutex are locked */
 152                 connection_closing( &connections[i] );
 153                 connection_close( &connections[i] );
 154
 155                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 156         }
 157
 158         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 159
 160         return 0;
 161 }
 162
 163 /*
 164  * Timeout idle connections.
 165  */
 166 int connections_timeout_idle(time_t now)
 167 {
 168         int i = 0;
 169         int connindex;
 170         Connection* c;
 171
 172         ldap_pvt_thread_mutex_lock( &connections_mutex );
 173
 174         for( c = connection_first( &connindex );
 175                 c != NULL;
 176                 c = connection_next( c, &connindex ) )
 177         {
 178                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 179                         /* close it */
 180                         connection_closing( c );
 181                         connection_close( c );
 182                         i++;
 183                 }
 184         }
 185         connection_done( c );
 186
 187         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 188
 189         return i;
 190 }
 191
 192 static Connection* connection_get( ber_socket_t s )
 193 {
 194         /* connections_mutex should be locked by caller */
 195
 196         Connection *c;
 197
 198         Debug( LDAP_DEBUG_ARGS,
 199                 "connection_get(%ld)\n",
 200                 (long) s, 0, 0 );
 201
 202         assert( connections != NULL );
 203
 204         if(s == AC_SOCKET_INVALID) {
 205                 return NULL;
 206         }
 207
 208 #ifndef HAVE_WINSOCK
 209         c = &connections[s];
 210
 211         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 212
 213 #else
 214         c = NULL;
 215         {
 216                 ber_socket_t i, sd;
 217
 218                 for(i=0; i<dtblsize; i++) {
 219                         ber_sockbuf_ctrl( connections[i].c_sb,
 220                                 LBER_SB_OPT_GET_FD, &sd );
 221
 222                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 223                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 224                                 assert( connections[i].c_sb == 0 );
 225                                 break;
 226                         }
 227
 228                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 229                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 230                                 assert( sd == AC_SOCKET_INVALID );
 231                                 continue;
 232                         }
 233
 234                         /* state can actually change from used -> unused by resched,
 235                          * so don't assert details here.
 236                          */
 237
 238                         if( sd == s ) {
 239                                 c = &connections[i];
 240                                 break;
 241                         }
 242                 }
 243         }
 244 #endif
 245
 246         if( c != NULL ) {
 247                 ber_socket_t    sd;
 248
 249                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 250
 251                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 252                 if( c->c_struct_state != SLAP_C_USED ) {
 253                         /* connection must have been closed due to resched */
 254
 255                         assert( c->c_conn_state == SLAP_C_INVALID );
 256                         assert( sd == AC_SOCKET_INVALID );
 257
 258                         Debug( LDAP_DEBUG_TRACE,
 259                                 "connection_get(%d): connection not used\n",
 260                                 s, 0, 0 );
 261
 262                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 263                         return NULL;
 264                 }
 265
 266                 Debug( LDAP_DEBUG_TRACE,
 267                         "connection_get(%d): got connid=%ld\n",
 268                         s, c->c_connid, 0 );
 269
 270                 c->c_n_get++;
 271
 272                 assert( c->c_struct_state == SLAP_C_USED );
 273                 assert( c->c_conn_state != SLAP_C_INVALID );
 274                 assert( sd != AC_SOCKET_INVALID );
 275
 276         c->c_activitytime = slap_get_time();
 277         }
 278
 279         return c;
 280 }
 281
 282 static void connection_return( Connection *c )
 283 {
 284         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 285 }
 286
 287 long connection_init(
 288         ber_socket_t s,
 289         const char* url,
 290         const char* dnsname,
 291         const char* peername,
 292         const char* sockname,
 293         int use_tls,
 294         slap_ssf_t ssf,
 295         char *authid )
 296 {
 297         unsigned long id;
 298         Connection *c;
 299
 300         assert( connections != NULL );
 301
 302         assert( dnsname != NULL );
 303         assert( peername != NULL );
 304         assert( sockname != NULL );
 305
 306 #ifndef HAVE_TLS
 307         assert( !use_tls );
 308 #endif
 309
 310         if( s == AC_SOCKET_INVALID ) {
 311         Debug( LDAP_DEBUG_ANY,
 312                         "connection_init(%ld): invalid.\n",
 313                         (long) s, 0, 0 );
 314                 return -1;
 315         }
 316
 317         assert( s >= 0 );
 318 #ifndef HAVE_WINSOCK
 319         assert( s < dtblsize );
 320 #endif
 321
 322         ldap_pvt_thread_mutex_lock( &connections_mutex );
 323
 324 #ifndef HAVE_WINSOCK
 325         c = &connections[s];
 326
 327 #else
 328         {
 329                 unsigned int i;
 330
 331                 c = NULL;
 332
 333         for( i=0; i < dtblsize; i++) {
 334                 ber_socket_t    sd;
 335
 336             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 337                 assert( connections[i].c_sb == 0 );
 338                 c = &connections[i];
 339                 break;
 340             }
 341
 342                         sd = AC_SOCKET_INVALID;
 343                         if (connections[i].c_sb != NULL)
 344                         ber_sockbuf_ctrl( connections[i].c_sb, LBER_SB_OPT_GET_FD, &sd );
 345
 346             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 347                 assert( sd == AC_SOCKET_INVALID );
 348                 c = &connections[i];
 349                 break;
 350             }
 351
 352             assert( connections[i].c_struct_state == SLAP_C_USED );
 353             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 354             assert( sd != AC_SOCKET_INVALID );
 355         }
 356
 357         if( c == NULL ) {
 358                 Debug( LDAP_DEBUG_ANY,
 359                                 "connection_init(%d): connection table full (%d/%d)\n",
 360                                 s, i, dtblsize);
 361             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 362             return -1;
 363         }
 364     }
 365 #endif
 366
 367     assert( c != NULL );
 368
 369     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 370                 c->c_authmech = NULL;
 371         c->c_dn = NULL;
 372         c->c_cdn = NULL;
 373
 374                 c->c_listener_url = NULL;
 375                 c->c_peer_domain = NULL;
 376         c->c_peer_name = NULL;
 377         c->c_sock_name = NULL;
 378
 379         c->c_ops = NULL;
 380         c->c_pending_ops = NULL;
 381
 382                 c->c_sasl_bind_mech = NULL;
 383                 c->c_sasl_context = NULL;
 384                 c->c_sasl_extra = NULL;
 385
 386         c->c_sb = ber_sockbuf_alloc( );
 387                 c->c_currentber = NULL;
 388
 389         /* should check status of thread calls */
 390         ldap_pvt_thread_mutex_init( &c->c_mutex );
 391         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 392         ldap_pvt_thread_cond_init( &c->c_write_cv );
 393
 394         c->c_struct_state = SLAP_C_UNUSED;
 395     }
 396
 397     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 398
 399     assert( c->c_struct_state == SLAP_C_UNUSED );
 400         assert( c->c_authmech == NULL );
 401     assert(     c->c_dn == NULL );
 402     assert(     c->c_cdn == NULL );
 403     assert( c->c_listener_url == NULL );
 404     assert( c->c_peer_domain == NULL );
 405     assert( c->c_peer_name == NULL );
 406     assert( c->c_sock_name == NULL );
 407     assert( c->c_ops == NULL );
 408     assert( c->c_pending_ops == NULL );
 409         assert( c->c_sasl_bind_mech == NULL );
 410         assert( c->c_sasl_context == NULL );
 411         assert( c->c_sasl_extra == NULL );
 412         assert( c->c_currentber == NULL );
 413
 414         c->c_listener_url = ch_strdup( url  );
 415         c->c_peer_domain = ch_strdup( dnsname  );
 416     c->c_peer_name = ch_strdup( peername  );
 417     c->c_sock_name = ch_strdup( sockname );
 418
 419     c->c_n_ops_received = 0;
 420     c->c_n_ops_executing = 0;
 421     c->c_n_ops_pending = 0;
 422     c->c_n_ops_completed = 0;
 423
 424         c->c_n_get = 0;
 425         c->c_n_read = 0;
 426         c->c_n_write = 0;
 427
 428         /* set to zero until bind, implies LDAP_VERSION3 */
 429         c->c_protocol = 0;
 430
 431     c->c_activitytime = c->c_starttime = slap_get_time();
 432
 433     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp, LBER_SBIOD_LEVEL_PROVIDER,
 434         (void *)&s );
 435     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 436         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 437 #ifdef LDAP_DEBUG
 438     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug, INT_MAX, NULL );
 439 #endif
 440     if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK, c /* non-NULL */ ) < 0 ) {
 441         Debug( LDAP_DEBUG_ANY,
 442             "connection_init(%d, %s): set nonblocking failed\n",
 443             s, c->c_peer_name, 0 );
 444     }
 445
 446
 447     id = c->c_connid = conn_nextid++;
 448
 449     c->c_conn_state = SLAP_C_INACTIVE;
 450     c->c_struct_state = SLAP_C_USED;
 451
 452         c->c_ssf = c->c_transport_ssf = ssf;
 453         c->c_tls_ssf = 0;
 454
 455 #ifdef HAVE_TLS
 456     if ( use_tls ) {
 457             c->c_is_tls = 1;
 458             c->c_needs_tls_accept = 1;
 459     } else {
 460             c->c_is_tls = 0;
 461             c->c_needs_tls_accept = 0;
 462     }
 463 #endif
 464
 465         slap_sasl_open( c );
 466         slap_sasl_external( c, ssf, authid );
 467
 468     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 469     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 470
 471     backend_connection_init(c);
 472
 473     return id;
 474 }
 475
 476 static void
 477 connection_destroy( Connection *c )
 478 {
 479         /* note: connections_mutex should be locked by caller */
 480     ber_socket_t        sd;
 481
 482     assert( connections != NULL );
 483     assert( c != NULL );
 484     assert( c->c_struct_state != SLAP_C_UNUSED );
 485     assert( c->c_conn_state != SLAP_C_INVALID );
 486     assert( c->c_ops == NULL );
 487
 488     backend_connection_destroy(c);
 489
 490     c->c_protocol = 0;
 491     c->c_connid = -1;
 492
 493     c->c_activitytime = c->c_starttime = 0;
 494
 495         if(c->c_authmech != NULL ) {
 496                 free(c->c_authmech);
 497                 c->c_authmech = NULL;
 498         }
 499     if(c->c_dn != NULL) {
 500         free(c->c_dn);
 501         c->c_dn = NULL;
 502     }
 503         if(c->c_cdn != NULL) {
 504                 free(c->c_cdn);
 505                 c->c_cdn = NULL;
 506         }
 507         if(c->c_listener_url != NULL) {
 508                 free(c->c_listener_url);
 509                 c->c_listener_url = NULL;
 510         }
 511         if(c->c_peer_domain != NULL) {
 512                 free(c->c_peer_domain);
 513                 c->c_peer_domain = NULL;
 514         }
 515         if(c->c_peer_name != NULL) {
 516 #ifdef LDAP_PF_lOCAL
 517                 /*
 518                  * If peer was a domain socket, unlink. Mind you,
 519                  * they may be un-named. Should we leave this to
 520                  * the client?
 521                  */
 522                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 523                         char *path = c->c_peer_name + 5;
 524                         if (path != '\0') {
 525                                 (void)unlink(path);
 526                         }
 527                 }
 528 #endif /* LDAP_PF_LOCAL */
 529
 530                 free(c->c_peer_name);
 531                 c->c_peer_name = NULL;
 532         }
 533         if(c->c_sock_name != NULL) {
 534                 free(c->c_sock_name);
 535                 c->c_sock_name = NULL;
 536         }
 537
 538         c->c_sasl_bind_in_progress = 0;
 539         if(c->c_sasl_bind_mech != NULL) {
 540                 free(c->c_sasl_bind_mech);
 541                 c->c_sasl_bind_mech = NULL;
 542         }
 543
 544         slap_sasl_close( c );
 545
 546         if ( c->c_currentber != NULL ) {
 547                 ber_free( c->c_currentber, 1 );
 548                 c->c_currentber = NULL;
 549         }
 550
 551         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 552         if ( sd != AC_SOCKET_INVALID ) {
 553                 slapd_remove( sd, 0 );
 554
 555                 Statslog( LDAP_DEBUG_STATS,
 556                     "conn=%ld fd=%d closed\n",
 557                         c->c_connid, sd, 0, 0, 0 );
 558         }
 559
 560         ber_sockbuf_free( c->c_sb );
 561         c->c_sb = ber_sockbuf_alloc( );
 562
 563     c->c_conn_state = SLAP_C_INVALID;
 564     c->c_struct_state = SLAP_C_UNUSED;
 565 }
 566
 567 int connection_state_closing( Connection *c )
 568 {
 569         /* c_mutex must be locked by caller */
 570
 571         int state;
 572         assert( c != NULL );
 573         assert( c->c_struct_state == SLAP_C_USED );
 574
 575         state = c->c_conn_state;
 576
 577         assert( state != SLAP_C_INVALID );
 578
 579         return state == SLAP_C_CLOSING;
 580 }
 581
 582 static void connection_abandon( Connection *c )
 583 {
 584         /* c_mutex must be locked by caller */
 585
 586         Operation *o;
 587
 588         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 589                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 590                 o->o_abandon = 1;
 591                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 592         }
 593
 594         /* remove pending operations */
 595         for( o = slap_op_pop( &c->c_pending_ops );
 596                 o != NULL;
 597                 o = slap_op_pop( &c->c_pending_ops ) )
 598         {
 599                 slap_op_free( o );
 600         }
 601 }
 602
 603 void connection_closing( Connection *c )
 604 {
 605         assert( connections != NULL );
 606         assert( c != NULL );
 607         assert( c->c_struct_state == SLAP_C_USED );
 608         assert( c->c_conn_state != SLAP_C_INVALID );
 609
 610         /* c_mutex must be locked by caller */
 611
 612         if( c->c_conn_state != SLAP_C_CLOSING ) {
 613                 ber_socket_t    sd;
 614
 615                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 616                 Debug( LDAP_DEBUG_TRACE,
 617                         "connection_closing: readying conn=%ld sd=%d for close\n",
 618                         c->c_connid, sd, 0 );
 619
 620                 /* update state to closing */
 621                 c->c_conn_state = SLAP_C_CLOSING;
 622
 623                 /* don't listen on this port anymore */
 624                 slapd_clr_read( sd, 1 );
 625
 626                 /* abandon active operations */
 627                 connection_abandon( c );
 628
 629                 /* wake write blocked operations */
 630                 slapd_clr_write( sd, 1 );
 631                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 632         }
 633 }
 634
 635 static void connection_close( Connection *c )
 636 {
 637         ber_socket_t    sd;
 638
 639         assert( connections != NULL );
 640         assert( c != NULL );
 641         assert( c->c_struct_state == SLAP_C_USED );
 642         assert( c->c_conn_state == SLAP_C_CLOSING );
 643
 644         /* note: connections_mutex and c_mutex should be locked by caller */
 645
 646         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 647         if( c->c_ops != NULL ) {
 648                 Debug( LDAP_DEBUG_TRACE,
 649                         "connection_close: deferring conn=%ld sd=%d\n",
 650                         c->c_connid, sd, 0 );
 651
 652                 return;
 653         }
 654
 655         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 656                 c->c_connid, sd, 0 );
 657
 658         connection_destroy( c );
 659 }
 660
 661 unsigned long connections_nextid(void)
 662 {
 663         unsigned long id;
 664         assert( connections != NULL );
 665
 666         ldap_pvt_thread_mutex_lock( &connections_mutex );
 667
 668         id = conn_nextid;
 669
 670         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 671
 672         return id;
 673 }
 674
 675 Connection* connection_first( ber_socket_t *index )
 676 {
 677         assert( connections != NULL );
 678         assert( index != NULL );
 679
 680         ldap_pvt_thread_mutex_lock( &connections_mutex );
 681
 682         *index = 0;
 683
 684         return connection_next(NULL, index);
 685 }
 686
 687 Connection* connection_next( Connection *c, ber_socket_t *index )
 688 {
 689         assert( connections != NULL );
 690         assert( index != NULL );
 691         assert( *index <= dtblsize );
 692
 693         if( c != NULL ) {
 694                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 695         }
 696
 697         c = NULL;
 698
 699         for(; *index < dtblsize; (*index)++) {
 700                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 701                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 702 #ifndef HAVE_WINSOCK
 703                         continue;
 704 #else
 705                         break;
 706 #endif
 707                 }
 708
 709                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 710                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 711                         c = &connections[(*index)++];
 712                         break;
 713                 }
 714
 715                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 716                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 717         }
 718
 719         if( c != NULL ) {
 720                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 721         }
 722
 723         return c;
 724 }
 725
 726 void connection_done( Connection *c )
 727 {
 728         assert( connections != NULL );
 729
 730         if( c != NULL ) {
 731                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 732         }
 733
 734         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 735 }
 736
 737 /*
 738  * connection_activity - handle the request operation op on connection
 739  * conn.  This routine figures out what kind of operation it is and
 740  * calls the appropriate stub to handle it.
 741  */
 742
 743 static void *
 744 connection_operation( void *arg_v )
 745 {
 746         int rc;
 747         struct co_arg   *arg = arg_v;
 748         ber_tag_t tag = arg->co_op->o_tag;
 749         Connection *conn = arg->co_conn;
 750
 751         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 752         num_ops_initiated++;
 753         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 754
 755         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 756                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 757                         "error: SASL bind in progress (tag=%ld).\n",
 758                         (long) tag, 0, 0 );
 759                 send_ldap_result( conn, arg->co_op,
 760                         rc = LDAP_OPERATIONS_ERROR,
 761                         NULL, "SASL bind in progress", NULL, NULL );
 762                 goto operations_error;
 763         }
 764
 765         switch ( tag ) {
 766         case LDAP_REQ_BIND:
 767                 rc = do_bind( conn, arg->co_op );
 768                 break;
 769
 770         case LDAP_REQ_UNBIND:
 771                 rc = do_unbind( conn, arg->co_op );
 772                 break;
 773
 774         case LDAP_REQ_ADD:
 775                 rc = do_add( conn, arg->co_op );
 776                 break;
 777
 778         case LDAP_REQ_DELETE:
 779                 rc = do_delete( conn, arg->co_op );
 780                 break;
 781
 782         case LDAP_REQ_MODRDN:
 783                 rc = do_modrdn( conn, arg->co_op );
 784                 break;
 785
 786         case LDAP_REQ_MODIFY:
 787                 rc = do_modify( conn, arg->co_op );
 788                 break;
 789
 790         case LDAP_REQ_COMPARE:
 791                 rc = do_compare( conn, arg->co_op );
 792                 break;
 793
 794         case LDAP_REQ_SEARCH:
 795                 rc = do_search( conn, arg->co_op );
 796                 break;
 797
 798         case LDAP_REQ_ABANDON:
 799                 rc = do_abandon( conn, arg->co_op );
 800                 break;
 801
 802         case LDAP_REQ_EXTENDED:
 803                 rc = do_extended( conn, arg->co_op );
 804                 break;
 805
 806         default:
 807                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 808                     tag, 0, 0 );
 809                 arg->co_op->o_tag = LBER_ERROR;
 810                 send_ldap_disconnect( conn, arg->co_op,
 811                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 812                 rc = -1;
 813                 break;
 814         }
 815
 816         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 817
 818 operations_error:
 819         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 820         num_ops_completed++;
 821         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 822
 823         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 824
 825         conn->c_n_ops_executing--;
 826         conn->c_n_ops_completed++;
 827
 828         slap_op_remove( &conn->c_ops, arg->co_op );
 829         slap_op_free( arg->co_op );
 830         arg->co_op = NULL;
 831         arg->co_conn = NULL;
 832         free( (char *) arg );
 833         arg = NULL;
 834
 835         switch( tag ) {
 836         case LBER_ERROR:
 837         case LDAP_REQ_UNBIND:
 838                 /* c_mutex is locked */
 839                 connection_closing( conn );
 840                 break;
 841
 842         case LDAP_REQ_BIND:
 843                 conn->c_sasl_bind_in_progress =
 844                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
 845
 846                 if( conn->c_conn_state == SLAP_C_BINDING) {
 847                         conn->c_conn_state = SLAP_C_ACTIVE;
 848                 }
 849         }
 850
 851         connection_resched( conn );
 852
 853         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 854
 855         return NULL;
 856 }
 857
 858 int connection_read(ber_socket_t s)
 859 {
 860         int rc = 0;
 861         Connection *c;
 862         assert( connections != NULL );
 863
 864         ldap_pvt_thread_mutex_lock( &connections_mutex );
 865
 866         /* get (locked) connection */
 867         c = connection_get( s );
 868
 869         if( c == NULL ) {
 870                 Debug( LDAP_DEBUG_ANY,
 871                         "connection_read(%ld): no connection!\n",
 872                         (long) s, 0, 0 );
 873
 874                 slapd_remove(s, 0);
 875
 876                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 877                 return -1;
 878         }
 879
 880         c->c_n_read++;
 881
 882         if( c->c_conn_state == SLAP_C_CLOSING ) {
 883                 Debug( LDAP_DEBUG_TRACE,
 884                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 885                         s, c->c_connid, 0 );
 886
 887                 connection_return( c );
 888                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 889                 return 0;
 890         }
 891
 892         Debug( LDAP_DEBUG_TRACE,
 893                 "connection_read(%d): checking for input on id=%ld\n",
 894                 s, c->c_connid, 0 );
 895
 896 #ifdef HAVE_TLS
 897         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 898                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 899                 if ( rc < 0 ) {
 900                         struct timeval tv;
 901                         fd_set rfd;
 902
 903                         Debug( LDAP_DEBUG_TRACE,
 904                                 "connection_read(%d): TLS accept error "
 905                                 "error=%d id=%ld, closing\n",
 906                                 s, rc, c->c_connid );
 907
 908                         c->c_needs_tls_accept = 0;
 909                         /* connections_mutex and c_mutex are locked */
 910                         connection_closing( c );
 911
 912                         /* Drain input before close, to allow SSL error codes
 913                          * to propagate to client. */
 914                         FD_ZERO(&rfd);
 915                         FD_SET(s, &rfd);
 916                         for (rc=1; rc>0;)
 917                         {
 918                             tv.tv_sec = 1;
 919                             tv.tv_usec = 0;
 920                             rc = select(s+1, &rfd, NULL, NULL, &tv);
 921                             if (rc == 1)
 922                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN,
 923                                     NULL);
 924                         }
 925                         connection_close( c );
 926
 927                 } else if ( rc == 0 ) {
 928                         void *ssl;
 929                         char *authid;
 930
 931                         c->c_needs_tls_accept = 0;
 932
 933                         /* we need to let SASL know */
 934                         ssl = (void *)ldap_pvt_tls_sb_handle( c->c_sb );
 935
 936                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
 937                         if( c->c_tls_ssf > c->c_ssf ) {
 938                                 c->c_ssf = c->c_tls_ssf;
 939                         }
 940
 941                         authid = (char *)ldap_pvt_tls_get_peer( ssl );
 942                         slap_sasl_external( c, c->c_tls_ssf, authid );
 943                 }
 944                 connection_return( c );
 945                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 946                 return 0;
 947         }
 948 #endif
 949
 950 #ifdef HAVE_CYRUS_SASL
 951         if ( c->c_sasl_layers ) {
 952                 c->c_sasl_layers = 0;
 953
 954                 rc = ldap_pvt_sasl_install( c->c_sb,  c->c_sasl_context );
 955
 956                 if( rc != LDAP_SUCCESS ) {
 957                         Debug( LDAP_DEBUG_TRACE,
 958                                 "connection_read(%d): SASL install error "
 959                                 "error=%d id=%ld, closing\n",
 960                                 s, rc, c->c_connid );
 961
 962                         /* connections_mutex and c_mutex are locked */
 963                         connection_closing( c );
 964                         connection_close( c );
 965                         connection_return( c );
 966                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 967                         return 0;
 968                 }
 969         }
 970 #endif
 971
 972 #define CONNECTION_INPUT_LOOP 1
 973
 974 #ifdef DATA_READY_LOOP
 975         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_DATA_READY, NULL ) )
 976 #elif CONNECTION_INPUT_LOOP
 977         while(!rc)
 978 #endif
 979         {
 980                 /* How do we do this without getting into a busy loop ? */
 981                 rc = connection_input( c );
 982         }
 983
 984         if( rc < 0 ) {
 985                 Debug( LDAP_DEBUG_TRACE,
 986                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 987                         s, rc, c->c_connid );
 988
 989                 /* connections_mutex and c_mutex are locked */
 990                 connection_closing( c );
 991                 connection_close( c );
 992         }
 993
 994         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
 995                 slapd_set_read( s, 1 );
 996         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
 997                 slapd_set_write( s, 1 );
 998         connection_return( c );
 999         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1000         return 0;
1001 }
1002
1003 static int
1004 connection_input(
1005     Connection *conn
1006 )
1007 {
1008         Operation *op;
1009         ber_tag_t       tag;
1010         ber_len_t       len;
1011         ber_int_t       msgid;
1012         BerElement      *ber;
1013
1014         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
1015             == NULL ) {
1016                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1017                 return -1;
1018         }
1019
1020         errno = 0;
1021
1022         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1023         if ( tag != LDAP_TAG_MESSAGE ) {
1024                 int err = errno;
1025                 ber_socket_t    sd;
1026
1027                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1028
1029                 Debug( LDAP_DEBUG_TRACE,
1030                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1031                         sd, err, sock_errstr(err) );
1032
1033                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1034                         /* log, close and send error */
1035                         ber_free( conn->c_currentber, 1 );
1036                         conn->c_currentber = NULL;
1037
1038                         return -2;
1039                 }
1040                 return 1;
1041         }
1042
1043         ber = conn->c_currentber;
1044         conn->c_currentber = NULL;
1045
1046         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1047                 /* log, close and send error */
1048                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
1049                     0 );
1050                 ber_free( ber, 1 );
1051                 return -1;
1052         }
1053
1054         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1055                 /* log, close and send error */
1056                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
1057                     0 );
1058                 ber_free( ber, 1 );
1059
1060                 return -1;
1061         }
1062
1063         if(tag == LDAP_REQ_BIND) {
1064                 /* immediately abandon all exiting operations upon BIND */
1065                 connection_abandon( conn );
1066         }
1067
1068         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1069
1070         if ( conn->c_conn_state == SLAP_C_BINDING
1071                 || conn->c_conn_state == SLAP_C_CLOSING )
1072         {
1073                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1074                 conn->c_n_ops_pending++;
1075                 slap_op_add( &conn->c_pending_ops, op );
1076
1077         } else {
1078                 conn->c_n_ops_executing++;
1079                 connection_op_activate( conn, op );
1080         }
1081
1082 #ifdef NO_THREADS
1083         if ( conn->c_struct_state != SLAP_C_USED ) {
1084                 /* connection must have got closed underneath us */
1085                 return 1;
1086         }
1087 #endif
1088         assert( conn->c_struct_state == SLAP_C_USED );
1089
1090         return 0;
1091 }
1092
1093 static int
1094 connection_resched( Connection *conn )
1095 {
1096         Operation *op;
1097
1098         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1099                 ber_socket_t    sd;
1100
1101                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1102                 Debug( LDAP_DEBUG_TRACE,
1103                         "connection_resched: attempting closing conn=%ld sd=%d\n",
1104                         conn->c_connid, sd, 0 );
1105
1106                 ldap_pvt_thread_mutex_lock( &connections_mutex );
1107                 connection_close( conn );
1108                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1109                 return 0;
1110         }
1111
1112         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1113                 /* other states need different handling */
1114                 return 0;
1115         }
1116
1117         for( op = slap_op_pop( &conn->c_pending_ops );
1118                 op != NULL;
1119                 op = slap_op_pop( &conn->c_pending_ops ) )
1120         {
1121                 /* pending operations should not be marked for abandonment */
1122                 assert(!op->o_abandon);
1123
1124                 conn->c_n_ops_pending--;
1125                 conn->c_n_ops_executing++;
1126
1127                 connection_op_activate( conn, op );
1128
1129                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1130                         break;
1131                 }
1132         }
1133         return 0;
1134 }
1135
1136 static int connection_op_activate( Connection *conn, Operation *op )
1137 {
1138         struct co_arg *arg;
1139         int status;
1140         ber_tag_t tag = op->o_tag;
1141
1142         if(tag == LDAP_REQ_BIND) {
1143                 conn->c_conn_state = SLAP_C_BINDING;
1144         }
1145
1146         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1147         arg->co_conn = conn;
1148         arg->co_op = op;
1149
1150         arg->co_op->o_dn = ch_strdup( conn->c_dn != NULL ? conn->c_dn : "" );
1151         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1152         (void) dn_normalize( arg->co_op->o_ndn );
1153
1154         arg->co_op->o_protocol = conn->c_protocol
1155                 ? conn->c_protocol : LDAP_VERSION3;
1156         arg->co_op->o_connid = conn->c_connid;
1157
1158         arg->co_op->o_authtype = conn->c_authtype;
1159         arg->co_op->o_authmech = conn->c_authmech != NULL
1160                 ?  ch_strdup( conn->c_authmech ) : NULL;
1161
1162         slap_op_add( &conn->c_ops, arg->co_op );
1163
1164         status = ldap_pvt_thread_pool_submit( &connection_pool,
1165                 connection_operation, (void *) arg );
1166
1167         if ( status != 0 ) {
1168                 Debug( LDAP_DEBUG_ANY,
1169                 "ldap_pvt_thread_pool_submit failed (%d)\n", status, 0, 0 );
1170                 /* should move op to pending list */
1171         }
1172
1173         return status;
1174 }
1175
1176 int connection_write(ber_socket_t s)
1177 {
1178         Connection *c;
1179         assert( connections != NULL );
1180
1181         ldap_pvt_thread_mutex_lock( &connections_mutex );
1182
1183         c = connection_get( s );
1184
1185         slapd_clr_write( s, 0);
1186
1187         if( c == NULL ) {
1188                 Debug( LDAP_DEBUG_ANY,
1189                         "connection_write(%ld): no connection!\n",
1190                         (long) s, 0, 0 );
1191                 slapd_remove(s, 0);
1192                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1193                 return -1;
1194         }
1195
1196         c->c_n_write++;
1197
1198         Debug( LDAP_DEBUG_TRACE,
1199                 "connection_write(%d): waking output for id=%ld\n",
1200                 s, c->c_connid, 0 );
1201
1202         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1203
1204         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
1205                 slapd_set_read( s, 1 );
1206         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
1207                 slapd_set_write( s, 1 );
1208         connection_return( c );
1209         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1210         return 0;
1211 }