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 #include "lutil.h"
  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         const 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 void connection2anonymous( Connection *c )
 477 {
 478     assert( connections != NULL );
 479     assert( c != NULL );
 480
 481         if(c->c_authmech != NULL ) {
 482                 free(c->c_authmech);
 483                 c->c_authmech = NULL;
 484         }
 485
 486     if(c->c_dn != NULL) {
 487         free(c->c_dn);
 488         c->c_dn = NULL;
 489     }
 490
 491         if(c->c_cdn != NULL) {
 492                 free(c->c_cdn);
 493                 c->c_cdn = NULL;
 494         }
 495
 496         c->c_authc_backend = NULL;
 497         c->c_authz_backend = NULL;
 498 }
 499
 500 static void
 501 connection_destroy( Connection *c )
 502 {
 503         /* note: connections_mutex should be locked by caller */
 504     ber_socket_t        sd;
 505
 506     assert( connections != NULL );
 507     assert( c != NULL );
 508     assert( c->c_struct_state != SLAP_C_UNUSED );
 509     assert( c->c_conn_state != SLAP_C_INVALID );
 510     assert( c->c_ops == NULL );
 511
 512     backend_connection_destroy(c);
 513
 514     c->c_protocol = 0;
 515     c->c_connid = -1;
 516
 517     c->c_activitytime = c->c_starttime = 0;
 518
 519         connection2anonymous( c );
 520
 521         if(c->c_listener_url != NULL) {
 522                 free(c->c_listener_url);
 523                 c->c_listener_url = NULL;
 524         }
 525
 526         if(c->c_peer_domain != NULL) {
 527                 free(c->c_peer_domain);
 528                 c->c_peer_domain = NULL;
 529         }
 530         if(c->c_peer_name != NULL) {
 531 #ifdef LDAP_PF_lOCAL
 532                 /*
 533                  * If peer was a domain socket, unlink. Mind you,
 534                  * they may be un-named. Should we leave this to
 535                  * the client?
 536                  */
 537                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 538                         char *path = c->c_peer_name + 5;
 539                         if (path != '\0') {
 540                                 (void)unlink(path);
 541                         }
 542                 }
 543 #endif /* LDAP_PF_LOCAL */
 544
 545                 free(c->c_peer_name);
 546                 c->c_peer_name = NULL;
 547         }
 548         if(c->c_sock_name != NULL) {
 549                 free(c->c_sock_name);
 550                 c->c_sock_name = NULL;
 551         }
 552
 553         c->c_sasl_bind_in_progress = 0;
 554         if(c->c_sasl_bind_mech != NULL) {
 555                 free(c->c_sasl_bind_mech);
 556                 c->c_sasl_bind_mech = NULL;
 557         }
 558
 559         slap_sasl_close( c );
 560
 561         if ( c->c_currentber != NULL ) {
 562                 ber_free( c->c_currentber, 1 );
 563                 c->c_currentber = NULL;
 564         }
 565
 566         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 567         if ( sd != AC_SOCKET_INVALID ) {
 568                 slapd_remove( sd, 0 );
 569
 570                 Statslog( LDAP_DEBUG_STATS,
 571                     "conn=%ld fd=%d closed\n",
 572                         c->c_connid, sd, 0, 0, 0 );
 573         }
 574
 575         ber_sockbuf_free( c->c_sb );
 576         c->c_sb = ber_sockbuf_alloc( );
 577
 578     c->c_conn_state = SLAP_C_INVALID;
 579     c->c_struct_state = SLAP_C_UNUSED;
 580 }
 581
 582 int connection_state_closing( Connection *c )
 583 {
 584         /* c_mutex must be locked by caller */
 585
 586         int state;
 587         assert( c != NULL );
 588         assert( c->c_struct_state == SLAP_C_USED );
 589
 590         state = c->c_conn_state;
 591
 592         assert( state != SLAP_C_INVALID );
 593
 594         return state == SLAP_C_CLOSING;
 595 }
 596
 597 static void connection_abandon( Connection *c )
 598 {
 599         /* c_mutex must be locked by caller */
 600
 601         Operation *o;
 602
 603         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 604                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 605                 o->o_abandon = 1;
 606                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 607         }
 608
 609         /* remove pending operations */
 610         for( o = slap_op_pop( &c->c_pending_ops );
 611                 o != NULL;
 612                 o = slap_op_pop( &c->c_pending_ops ) )
 613         {
 614                 slap_op_free( o );
 615         }
 616 }
 617
 618 void connection_closing( Connection *c )
 619 {
 620         assert( connections != NULL );
 621         assert( c != NULL );
 622         assert( c->c_struct_state == SLAP_C_USED );
 623         assert( c->c_conn_state != SLAP_C_INVALID );
 624
 625         /* c_mutex must be locked by caller */
 626
 627         if( c->c_conn_state != SLAP_C_CLOSING ) {
 628                 ber_socket_t    sd;
 629
 630                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 631                 Debug( LDAP_DEBUG_TRACE,
 632                         "connection_closing: readying conn=%ld sd=%d for close\n",
 633                         c->c_connid, sd, 0 );
 634
 635                 /* update state to closing */
 636                 c->c_conn_state = SLAP_C_CLOSING;
 637
 638                 /* don't listen on this port anymore */
 639                 slapd_clr_read( sd, 1 );
 640
 641                 /* abandon active operations */
 642                 connection_abandon( c );
 643
 644                 /* wake write blocked operations */
 645                 slapd_clr_write( sd, 1 );
 646                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 647         }
 648 }
 649
 650 static void connection_close( Connection *c )
 651 {
 652         ber_socket_t    sd;
 653
 654         assert( connections != NULL );
 655         assert( c != NULL );
 656         assert( c->c_struct_state == SLAP_C_USED );
 657         assert( c->c_conn_state == SLAP_C_CLOSING );
 658
 659         /* note: connections_mutex and c_mutex should be locked by caller */
 660
 661         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 662         if( c->c_ops != NULL ) {
 663                 Debug( LDAP_DEBUG_TRACE,
 664                         "connection_close: deferring conn=%ld sd=%d\n",
 665                         c->c_connid, sd, 0 );
 666
 667                 return;
 668         }
 669
 670         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 671                 c->c_connid, sd, 0 );
 672
 673         connection_destroy( c );
 674 }
 675
 676 unsigned long connections_nextid(void)
 677 {
 678         unsigned long id;
 679         assert( connections != NULL );
 680
 681         ldap_pvt_thread_mutex_lock( &connections_mutex );
 682
 683         id = conn_nextid;
 684
 685         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 686
 687         return id;
 688 }
 689
 690 Connection* connection_first( ber_socket_t *index )
 691 {
 692         assert( connections != NULL );
 693         assert( index != NULL );
 694
 695         ldap_pvt_thread_mutex_lock( &connections_mutex );
 696
 697         *index = 0;
 698
 699         return connection_next(NULL, index);
 700 }
 701
 702 Connection* connection_next( Connection *c, ber_socket_t *index )
 703 {
 704         assert( connections != NULL );
 705         assert( index != NULL );
 706         assert( *index <= dtblsize );
 707
 708         if( c != NULL ) {
 709                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 710         }
 711
 712         c = NULL;
 713
 714         for(; *index < dtblsize; (*index)++) {
 715                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 716                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 717 #ifndef HAVE_WINSOCK
 718                         continue;
 719 #else
 720                         break;
 721 #endif
 722                 }
 723
 724                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 725                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 726                         c = &connections[(*index)++];
 727                         break;
 728                 }
 729
 730                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 731                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 732         }
 733
 734         if( c != NULL ) {
 735                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 736         }
 737
 738         return c;
 739 }
 740
 741 void connection_done( Connection *c )
 742 {
 743         assert( connections != NULL );
 744
 745         if( c != NULL ) {
 746                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 747         }
 748
 749         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 750 }
 751
 752 /*
 753  * connection_activity - handle the request operation op on connection
 754  * conn.  This routine figures out what kind of operation it is and
 755  * calls the appropriate stub to handle it.
 756  */
 757
 758 static void *
 759 connection_operation( void *arg_v )
 760 {
 761         int rc;
 762         struct co_arg   *arg = arg_v;
 763         ber_tag_t tag = arg->co_op->o_tag;
 764         Connection *conn = arg->co_conn;
 765
 766         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 767         num_ops_initiated++;
 768         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 769
 770         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 771                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 772                         "error: SASL bind in progress (tag=%ld).\n",
 773                         (long) tag, 0, 0 );
 774                 send_ldap_result( conn, arg->co_op,
 775                         rc = LDAP_OPERATIONS_ERROR,
 776                         NULL, "SASL bind in progress", NULL, NULL );
 777                 goto operations_error;
 778         }
 779
 780         switch ( tag ) {
 781         case LDAP_REQ_BIND:
 782                 rc = do_bind( conn, arg->co_op );
 783                 break;
 784
 785         case LDAP_REQ_UNBIND:
 786                 rc = do_unbind( conn, arg->co_op );
 787                 break;
 788
 789         case LDAP_REQ_ADD:
 790                 rc = do_add( conn, arg->co_op );
 791                 break;
 792
 793         case LDAP_REQ_DELETE:
 794                 rc = do_delete( conn, arg->co_op );
 795                 break;
 796
 797         case LDAP_REQ_MODRDN:
 798                 rc = do_modrdn( conn, arg->co_op );
 799                 break;
 800
 801         case LDAP_REQ_MODIFY:
 802                 rc = do_modify( conn, arg->co_op );
 803                 break;
 804
 805         case LDAP_REQ_COMPARE:
 806                 rc = do_compare( conn, arg->co_op );
 807                 break;
 808
 809         case LDAP_REQ_SEARCH:
 810                 rc = do_search( conn, arg->co_op );
 811                 break;
 812
 813         case LDAP_REQ_ABANDON:
 814                 rc = do_abandon( conn, arg->co_op );
 815                 break;
 816
 817         case LDAP_REQ_EXTENDED:
 818                 rc = do_extended( conn, arg->co_op );
 819                 break;
 820
 821         default:
 822                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 823                     tag, 0, 0 );
 824                 arg->co_op->o_tag = LBER_ERROR;
 825                 send_ldap_disconnect( conn, arg->co_op,
 826                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 827                 rc = -1;
 828                 break;
 829         }
 830
 831         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 832
 833 operations_error:
 834         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 835         num_ops_completed++;
 836         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 837
 838         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 839
 840         conn->c_n_ops_executing--;
 841         conn->c_n_ops_completed++;
 842
 843         slap_op_remove( &conn->c_ops, arg->co_op );
 844         slap_op_free( arg->co_op );
 845         arg->co_op = NULL;
 846         arg->co_conn = NULL;
 847         free( (char *) arg );
 848         arg = NULL;
 849
 850         switch( tag ) {
 851         case LBER_ERROR:
 852         case LDAP_REQ_UNBIND:
 853                 /* c_mutex is locked */
 854                 connection_closing( conn );
 855                 break;
 856
 857         case LDAP_REQ_BIND:
 858                 conn->c_sasl_bind_in_progress =
 859                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
 860
 861                 if( conn->c_conn_state == SLAP_C_BINDING) {
 862                         conn->c_conn_state = SLAP_C_ACTIVE;
 863                 }
 864         }
 865
 866         connection_resched( conn );
 867
 868         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 869
 870         return NULL;
 871 }
 872
 873 int connection_read(ber_socket_t s)
 874 {
 875         int rc = 0;
 876         Connection *c;
 877         assert( connections != NULL );
 878
 879         ldap_pvt_thread_mutex_lock( &connections_mutex );
 880
 881         /* get (locked) connection */
 882         c = connection_get( s );
 883
 884         if( c == NULL ) {
 885                 Debug( LDAP_DEBUG_ANY,
 886                         "connection_read(%ld): no connection!\n",
 887                         (long) s, 0, 0 );
 888
 889                 slapd_remove(s, 0);
 890
 891                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 892                 return -1;
 893         }
 894
 895         c->c_n_read++;
 896
 897         if( c->c_conn_state == SLAP_C_CLOSING ) {
 898                 Debug( LDAP_DEBUG_TRACE,
 899                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 900                         s, c->c_connid, 0 );
 901
 902                 connection_return( c );
 903                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 904                 return 0;
 905         }
 906
 907         Debug( LDAP_DEBUG_TRACE,
 908                 "connection_read(%d): checking for input on id=%ld\n",
 909                 s, c->c_connid, 0 );
 910
 911 #ifdef HAVE_TLS
 912         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 913                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 914                 if ( rc < 0 ) {
 915                         struct timeval tv;
 916                         fd_set rfd;
 917
 918                         Debug( LDAP_DEBUG_TRACE,
 919                                 "connection_read(%d): TLS accept error "
 920                                 "error=%d id=%ld, closing\n",
 921                                 s, rc, c->c_connid );
 922
 923                         c->c_needs_tls_accept = 0;
 924                         /* connections_mutex and c_mutex are locked */
 925                         connection_closing( c );
 926
 927 #if 0
 928                         /* Drain input before close, to allow SSL error codes
 929                          * to propagate to client. */
 930                         FD_ZERO(&rfd);
 931                         FD_SET(s, &rfd);
 932                         for (rc=1; rc>0;)
 933                         {
 934                             tv.tv_sec = 1;
 935                             tv.tv_usec = 0;
 936                             rc = select(s+1, &rfd, NULL, NULL, &tv);
 937                             if (rc == 1)
 938                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN,
 939                                     NULL);
 940                         }
 941 #endif
 942                         connection_close( c );
 943
 944                 } else if ( rc == 0 ) {
 945                         void *ssl;
 946                         char *authid;
 947
 948                         c->c_needs_tls_accept = 0;
 949
 950                         /* we need to let SASL know */
 951                         ssl = (void *)ldap_pvt_tls_sb_handle( c->c_sb );
 952
 953                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
 954                         if( c->c_tls_ssf > c->c_ssf ) {
 955                                 c->c_ssf = c->c_tls_ssf;
 956                         }
 957
 958                         authid = (char *)ldap_pvt_tls_get_peer( ssl );
 959                         slap_sasl_external( c, c->c_tls_ssf, authid );
 960                 }
 961                 connection_return( c );
 962                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 963                 return 0;
 964         }
 965 #endif
 966
 967 #ifdef HAVE_CYRUS_SASL
 968         if ( c->c_sasl_layers ) {
 969                 c->c_sasl_layers = 0;
 970
 971                 rc = ldap_pvt_sasl_install( c->c_sb,  c->c_sasl_context );
 972
 973                 if( rc != LDAP_SUCCESS ) {
 974                         Debug( LDAP_DEBUG_TRACE,
 975                                 "connection_read(%d): SASL install error "
 976                                 "error=%d id=%ld, closing\n",
 977                                 s, rc, c->c_connid );
 978
 979                         /* connections_mutex and c_mutex are locked */
 980                         connection_closing( c );
 981                         connection_close( c );
 982                         connection_return( c );
 983                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 984                         return 0;
 985                 }
 986         }
 987 #endif
 988
 989 #define CONNECTION_INPUT_LOOP 1
 990
 991 #ifdef DATA_READY_LOOP
 992         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_DATA_READY, NULL ) )
 993 #elif CONNECTION_INPUT_LOOP
 994         while(!rc)
 995 #endif
 996         {
 997                 /* How do we do this without getting into a busy loop ? */
 998                 rc = connection_input( c );
 999         }
1000
1001         if( rc < 0 ) {
1002                 Debug( LDAP_DEBUG_TRACE,
1003                         "connection_read(%d): input error=%d id=%ld, closing.\n",
1004                         s, rc, c->c_connid );
1005
1006                 /* connections_mutex and c_mutex are locked */
1007                 connection_closing( c );
1008                 connection_close( c );
1009                 connection_return( c );
1010                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1011                 return 0;
1012         }
1013
1014         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1015                 slapd_set_read( s, 1 );
1016         }
1017
1018         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1019                 slapd_set_write( s, 1 );
1020         }
1021
1022         connection_return( c );
1023         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1024         return 0;
1025 }
1026
1027 static int
1028 connection_input(
1029     Connection *conn
1030 )
1031 {
1032         Operation *op;
1033         ber_tag_t       tag;
1034         ber_len_t       len;
1035         ber_int_t       msgid;
1036         BerElement      *ber;
1037
1038         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
1039             == NULL ) {
1040                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1041                 return -1;
1042         }
1043
1044         errno = 0;
1045
1046         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1047         if ( tag != LDAP_TAG_MESSAGE ) {
1048                 int err = errno;
1049                 ber_socket_t    sd;
1050
1051                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1052
1053                 Debug( LDAP_DEBUG_TRACE,
1054                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1055                         sd, err, sock_errstr(err) );
1056
1057                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1058                         /* log, close and send error */
1059                         ber_free( conn->c_currentber, 1 );
1060                         conn->c_currentber = NULL;
1061
1062                         return -2;
1063                 }
1064                 return 1;
1065         }
1066
1067         ber = conn->c_currentber;
1068         conn->c_currentber = NULL;
1069
1070         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1071                 /* log, close and send error */
1072                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
1073                     0 );
1074                 ber_free( ber, 1 );
1075                 return -1;
1076         }
1077
1078         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1079                 /* log, close and send error */
1080                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
1081                     0 );
1082                 ber_free( ber, 1 );
1083
1084                 return -1;
1085         }
1086
1087         if(tag == LDAP_REQ_BIND) {
1088                 /* immediately abandon all exiting operations upon BIND */
1089                 connection_abandon( conn );
1090         }
1091
1092         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1093
1094         if ( conn->c_conn_state == SLAP_C_BINDING
1095                 || conn->c_conn_state == SLAP_C_CLOSING )
1096         {
1097                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1098                 conn->c_n_ops_pending++;
1099                 slap_op_add( &conn->c_pending_ops, op );
1100
1101         } else {
1102                 conn->c_n_ops_executing++;
1103                 connection_op_activate( conn, op );
1104         }
1105
1106 #ifdef NO_THREADS
1107         if ( conn->c_struct_state != SLAP_C_USED ) {
1108                 /* connection must have got closed underneath us */
1109                 return 1;
1110         }
1111 #endif
1112         assert( conn->c_struct_state == SLAP_C_USED );
1113
1114         return 0;
1115 }
1116
1117 static int
1118 connection_resched( Connection *conn )
1119 {
1120         Operation *op;
1121
1122         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1123                 int rc;
1124                 ber_socket_t    sd;
1125                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1126
1127                 /* us trylock to avoid possible deadlock */
1128                 rc = ldap_pvt_thread_mutex_trylock( &connections_mutex );
1129
1130                 if( rc ) {
1131                         Debug( LDAP_DEBUG_TRACE,
1132                                 "connection_resched: reaquiring locks conn=%ld sd=%d\n",
1133                                 conn->c_connid, sd, 0 );
1134                         /*
1135                          * reaquire locks in the right order...
1136                          * this may allow another thread to close this connection,
1137                          * so recheck state below.
1138                          */
1139                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1140                         ldap_pvt_thread_mutex_lock( &connections_mutex );
1141                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1142                 }
1143
1144                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1145                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1146                                 "closed by other thread conn=%ld sd=%d\n",
1147                                 conn->c_connid, sd, 0 );
1148
1149                 } else {
1150                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1151                                 "attempting closing conn=%ld sd=%d\n",
1152                                 conn->c_connid, sd, 0 );
1153
1154                         connection_close( conn );
1155                 }
1156
1157                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1158                 return 0;
1159         }
1160
1161         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1162                 /* other states need different handling */
1163                 return 0;
1164         }
1165
1166         for( op = slap_op_pop( &conn->c_pending_ops );
1167                 op != NULL;
1168                 op = slap_op_pop( &conn->c_pending_ops ) )
1169         {
1170                 /* pending operations should not be marked for abandonment */
1171                 assert(!op->o_abandon);
1172
1173                 conn->c_n_ops_pending--;
1174                 conn->c_n_ops_executing++;
1175
1176                 connection_op_activate( conn, op );
1177
1178                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1179                         break;
1180                 }
1181         }
1182         return 0;
1183 }
1184
1185 static int connection_op_activate( Connection *conn, Operation *op )
1186 {
1187         struct co_arg *arg;
1188         int status;
1189         ber_tag_t tag = op->o_tag;
1190
1191         if(tag == LDAP_REQ_BIND) {
1192                 conn->c_conn_state = SLAP_C_BINDING;
1193         }
1194
1195         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1196         arg->co_conn = conn;
1197         arg->co_op = op;
1198
1199         arg->co_op->o_authz = conn->c_authz;
1200         arg->co_op->o_dn = ch_strdup( conn->c_dn != NULL ? conn->c_dn : "" );
1201         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1202         (void) dn_normalize( arg->co_op->o_ndn );
1203         arg->co_op->o_authtype = conn->c_authtype;
1204         arg->co_op->o_authmech = conn->c_authmech != NULL
1205                 ?  ch_strdup( conn->c_authmech ) : NULL;
1206
1207         arg->co_op->o_protocol = conn->c_protocol
1208                 ? conn->c_protocol : LDAP_VERSION3;
1209         arg->co_op->o_connid = conn->c_connid;
1210
1211         slap_op_add( &conn->c_ops, arg->co_op );
1212
1213         status = ldap_pvt_thread_pool_submit( &connection_pool,
1214                 connection_operation, (void *) arg );
1215
1216         if ( status != 0 ) {
1217                 Debug( LDAP_DEBUG_ANY,
1218                 "ldap_pvt_thread_pool_submit failed (%d)\n", status, 0, 0 );
1219                 /* should move op to pending list */
1220         }
1221
1222         return status;
1223 }
1224
1225 int connection_write(ber_socket_t s)
1226 {
1227         Connection *c;
1228         assert( connections != NULL );
1229
1230         ldap_pvt_thread_mutex_lock( &connections_mutex );
1231
1232         c = connection_get( s );
1233
1234         slapd_clr_write( s, 0);
1235
1236         if( c == NULL ) {
1237                 Debug( LDAP_DEBUG_ANY,
1238                         "connection_write(%ld): no connection!\n",
1239                         (long) s, 0, 0 );
1240                 slapd_remove(s, 0);
1241                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1242                 return -1;
1243         }
1244
1245         c->c_n_write++;
1246
1247         Debug( LDAP_DEBUG_TRACE,
1248                 "connection_write(%d): waking output for id=%ld\n",
1249                 s, c->c_connid, 0 );
1250
1251         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1252
1253         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
1254                 slapd_set_read( s, 1 );
1255         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
1256                 slapd_set_write( s, 1 );
1257         connection_return( c );
1258         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1259         return 0;
1260 }
1261
1262
1263 /*
1264  * Create client side and server side connection structures, connected to
1265  * one another, for the front end to use for searches on arbitrary back ends.
1266  */
1267
1268 int connection_internal_open( Connection **conn, LDAP **ldp, const char *id )
1269 {
1270         int rc;
1271         ber_socket_t fd[2] = {-1,-1};
1272         Operation *op;
1273
1274         *conn=NULL;
1275         *ldp=NULL;
1276
1277         rc = lutil_pair( fd );
1278         if( rc == -1 ) {
1279                 return LDAP_OTHER;
1280         }
1281
1282         rc = connection_init( fd[1], "INT", "localhost",
1283       "localhost:0", "localhost:00", 0, 256, id );
1284         if( rc < 0 ) {
1285                 tcp_close( fd[0] );
1286                 tcp_close( fd[1] );
1287                 return LDAP_OTHER;
1288         }
1289         slapd_add_internal( fd[1] );
1290
1291         /* A search operation, number 0 */
1292         op = slap_op_alloc( NULL, 0, LDAP_REQ_SEARCH, 0);
1293         op->o_ndn = ch_strdup( id );
1294         op->o_protocol = LDAP_VERSION3;
1295
1296         (*conn) = connection_get( fd[1] );
1297         (*conn)->c_ops = op;
1298     (*conn)->c_conn_state = SLAP_C_ACTIVE;
1299
1300
1301         /* Create the client side of the connection */
1302         rc = ldap_open_internal_connection( ldp, &(fd[0]) );
1303         if( rc != LDAP_SUCCESS ) {
1304                 tcp_close( fd[0] );
1305                 return LDAP_OTHER;
1306         }
1307
1308         /* The connection_get() will have locked the connection's mutex */
1309         ldap_pvt_thread_mutex_unlock(  &((*conn)->c_mutex) );
1310
1311         return LDAP_SUCCESS;
1312 }
1313
1314
1315 void connection_internal_close( Connection *conn )
1316 {
1317         connection_closing( conn );
1318         connection_close( conn );
1319 }