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
  11 #include <ac/socket.h>
  12 #include <ac/errno.h>
  13 #include <ac/signal.h>
  14 #include <ac/string.h>
  15 #include <ac/time.h>
  16
  17 #include "slap.h"
  18
  19 /* protected by connections_mutex */
  20 static ldap_pvt_thread_mutex_t connections_mutex;
  21 static Connection *connections = NULL;
  22 static unsigned long conn_nextid = 0;
  23
  24 /* structure state (protected by connections_mutex) */
  25 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  26 #define SLAP_C_UNUSED                   0x01
  27 #define SLAP_C_USED                             0x02
  28
  29 /* connection state (protected by c_mutex ) */
  30 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  31 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  32 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  33 #define SLAP_C_BINDING                  0x03    /* binding */
  34 #define SLAP_C_CLOSING                  0x04    /* closing */
  35
  36 const char *
  37 connection_state2str( int state )
  38 {
  39         switch( state ) {
  40         case SLAP_C_INVALID:    return "!";
  41         case SLAP_C_INACTIVE:   return "|";
  42         case SLAP_C_ACTIVE:             return "";
  43         case SLAP_C_BINDING:    return "B";
  44         case SLAP_C_CLOSING:    return "C";
  45         }
  46
  47         return "?";
  48 }
  49
  50 static Connection* connection_get( ber_socket_t s );
  51
  52 static int connection_input( Connection *c );
  53 static void connection_close( Connection *c );
  54
  55 static int connection_op_activate( Connection *conn, Operation *op );
  56 static int connection_resched( Connection *conn );
  57 static void connection_abandon( Connection *conn );
  58 static void connection_destroy( Connection *c );
  59
  60 struct co_arg {
  61         Connection      *co_conn;
  62         Operation       *co_op;
  63 };
  64
  65 /*
  66  * Initialize connection management infrastructure.
  67  */
  68 int connections_init(void)
  69 {
  70         assert( connections == NULL );
  71
  72         if( connections != NULL) {
  73                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  74                         0, 0, 0 );
  75                 return -1;
  76         }
  77
  78         /* should check return of every call */
  79         ldap_pvt_thread_mutex_init( &connections_mutex );
  80
  81         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  82
  83         if( connections == NULL ) {
  84                 Debug( LDAP_DEBUG_ANY,
  85                         "connections_init: allocation (%d*%ld) of connection array failed\n",
  86                         dtblsize, (long) sizeof(Connection), 0 );
  87                 return -1;
  88         }
  89
  90     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  91     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  92
  93         /*
  94          * per entry initialization of the Connection array initialization
  95          * will be done by connection_init()
  96          */
  97
  98         return 0;
  99 }
 100
 101 /*
 102  * Destroy connection management infrastructure.
 103  */
 104 int connections_destroy(void)
 105 {
 106         ber_socket_t i;
 107
 108         /* should check return of every call */
 109
 110         if( connections == NULL) {
 111                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 112                         0, 0, 0 );
 113                 return -1;
 114         }
 115
 116         for ( i = 0; i < dtblsize; i++ ) {
 117                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 118                         ber_sockbuf_free( connections[i].c_sb );
 119                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 120                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 121                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 122                 }
 123         }
 124
 125         free( connections );
 126         connections = NULL;
 127
 128         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 129         return 0;
 130 }
 131
 132 /*
 133  * shutdown all connections
 134  */
 135 int connections_shutdown(void)
 136 {
 137         ber_socket_t i;
 138
 139         ldap_pvt_thread_mutex_lock( &connections_mutex );
 140
 141         for ( i = 0; i < dtblsize; i++ ) {
 142                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 143                         continue;
 144                 }
 145
 146                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 147
 148                 /* connections_mutex and c_mutex are locked */
 149                 connection_closing( &connections[i] );
 150                 connection_close( &connections[i] );
 151
 152                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 153         }
 154
 155         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 156
 157         return 0;
 158 }
 159
 160 /*
 161  * Timeout idle connections.
 162  */
 163 int connections_timeout_idle(time_t now)
 164 {
 165         int i = 0;
 166         int connindex;
 167         Connection* c;
 168
 169         ldap_pvt_thread_mutex_lock( &connections_mutex );
 170
 171         for( c = connection_first( &connindex );
 172                 c != NULL;
 173                 c = connection_next( c, &connindex ) )
 174         {
 175                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 176                         /* close it */
 177                         connection_closing( c );
 178                         connection_close( c );
 179                         i++;
 180                 }
 181         }
 182         connection_done( c );
 183
 184         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 185
 186         return i;
 187 }
 188
 189 static Connection* connection_get( ber_socket_t s )
 190 {
 191         /* connections_mutex should be locked by caller */
 192
 193         Connection *c;
 194
 195         Debug( LDAP_DEBUG_ARGS,
 196                 "connection_get(%ld)\n",
 197                 (long) s, 0, 0 );
 198
 199         assert( connections != NULL );
 200
 201         if(s == AC_SOCKET_INVALID) {
 202                 return NULL;
 203         }
 204
 205 #ifndef HAVE_WINSOCK
 206         c = &connections[s];
 207
 208         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 209
 210 #else
 211         c = NULL;
 212         {
 213                 ber_socket_t i, sd;
 214
 215                 for(i=0; i<dtblsize; i++) {
 216                         ber_sockbuf_ctrl( connections[i].c_sb,
 217                                 LBER_SB_OPT_GET_FD, &sd );
 218
 219                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 220                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 221                                 assert( connections[i].c_sb == 0 );
 222                                 break;
 223                         }
 224
 225                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 226                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 227                                 assert( sd == AC_SOCKET_INVALID );
 228                                 continue;
 229                         }
 230
 231                         /* state can actually change from used -> unused by resched,
 232                          * so don't assert details here.
 233                          */
 234
 235                         if( sd == s ) {
 236                                 c = &connections[i];
 237                                 break;
 238                         }
 239                 }
 240         }
 241 #endif
 242
 243         if( c != NULL ) {
 244                 ber_socket_t    sd;
 245
 246                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 247
 248                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 249                 if( c->c_struct_state != SLAP_C_USED ) {
 250                         /* connection must have been closed due to resched */
 251
 252                         assert( c->c_conn_state == SLAP_C_INVALID );
 253                         assert( sd == AC_SOCKET_INVALID );
 254
 255                         Debug( LDAP_DEBUG_TRACE,
 256                                 "connection_get(%d): connection not used\n",
 257                                 s, 0, 0 );
 258
 259                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 260                         return NULL;
 261                 }
 262
 263                 Debug( LDAP_DEBUG_TRACE,
 264                         "connection_get(%d): got connid=%ld\n",
 265                         s, c->c_connid, 0 );
 266
 267                 c->c_n_get++;
 268
 269                 assert( c->c_struct_state == SLAP_C_USED );
 270                 assert( c->c_conn_state != SLAP_C_INVALID );
 271                 assert( sd != AC_SOCKET_INVALID );
 272
 273         c->c_activitytime = slap_get_time();
 274         }
 275
 276         return c;
 277 }
 278
 279 static void connection_return( Connection *c )
 280 {
 281         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 282 }
 283
 284 long connection_init(
 285         ber_socket_t s,
 286         const char* url,
 287         const char* dnsname,
 288         const char* peername,
 289         const char* sockname,
 290         int use_tls )
 291 {
 292         unsigned long id;
 293         Connection *c;
 294
 295         assert( connections != NULL );
 296
 297         assert( dnsname != NULL );
 298         assert( peername != NULL );
 299         assert( sockname != NULL );
 300
 301 #ifndef HAVE_TLS
 302         assert( !use_tls );
 303 #endif
 304
 305         if( s == AC_SOCKET_INVALID ) {
 306         Debug( LDAP_DEBUG_ANY,
 307                         "connection_init(%ld): invalid.\n",
 308                         (long) s, 0, 0 );
 309                 return -1;
 310         }
 311
 312         assert( s >= 0 );
 313 #ifndef HAVE_WINSOCK
 314         assert( s < dtblsize );
 315 #endif
 316
 317         ldap_pvt_thread_mutex_lock( &connections_mutex );
 318
 319 #ifndef HAVE_WINSOCK
 320         c = &connections[s];
 321
 322 #else
 323         {
 324                 unsigned int i;
 325
 326                 c = NULL;
 327
 328         for( i=0; i < dtblsize; i++) {
 329             ber_socket_t        sd;
 330
 331             ber_sockbuf_ctrl( connections[i].c_sb, LBER_SB_OPT_GET_FD, &sd );
 332
 333             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 334                 assert( connections[i].c_sb == 0 );
 335                 c = &connections[i];
 336                 break;
 337             }
 338
 339             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 340                 assert( sd == AC_SOCKET_INVALID );
 341                 c = &connections[i];
 342                 break;
 343             }
 344
 345             assert( connections[i].c_struct_state == SLAP_C_USED );
 346             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 347             assert( sd != AC_SOCKET_INVALID );
 348         }
 349
 350         if( c == NULL ) {
 351                 Debug( LDAP_DEBUG_ANY,
 352                                 "connection_init(%d): connection table full (%d/%d)\n",
 353                                 s, i, dtblsize);
 354             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 355             return -1;
 356         }
 357     }
 358 #endif
 359
 360     assert( c != NULL );
 361
 362     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 363                 c->c_authmech = NULL;
 364         c->c_dn = NULL;
 365         c->c_cdn = NULL;
 366
 367                 c->c_listener_url = NULL;
 368                 c->c_peer_domain = NULL;
 369         c->c_peer_name = NULL;
 370         c->c_sock_name = NULL;
 371
 372         c->c_ops = NULL;
 373         c->c_pending_ops = NULL;
 374
 375                 c->c_sasl_bind_mech = NULL;
 376 #ifdef HAVE_CYRUS_SASL
 377                 c->c_sasl_bind_context = NULL;
 378 #endif
 379
 380         c->c_sb = ber_sockbuf_alloc( );
 381                 c->c_currentber = NULL;
 382
 383         /* should check status of thread calls */
 384         ldap_pvt_thread_mutex_init( &c->c_mutex );
 385         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 386         ldap_pvt_thread_cond_init( &c->c_write_cv );
 387
 388         c->c_struct_state = SLAP_C_UNUSED;
 389     }
 390
 391     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 392
 393     assert( c->c_struct_state == SLAP_C_UNUSED );
 394         assert( c->c_authmech == NULL );
 395     assert(     c->c_dn == NULL );
 396     assert(     c->c_cdn == NULL );
 397     assert( c->c_listener_url == NULL );
 398     assert( c->c_peer_domain == NULL );
 399     assert( c->c_peer_name == NULL );
 400     assert( c->c_sock_name == NULL );
 401     assert( c->c_ops == NULL );
 402     assert( c->c_pending_ops == NULL );
 403         assert( c->c_sasl_bind_mech == NULL );
 404 #ifdef HAVE_CYRUS_SASL
 405         assert( c->c_sasl_bind_context == NULL );
 406 #endif
 407         assert( c->c_currentber == NULL );
 408
 409         c->c_listener_url = ch_strdup( url  );
 410         c->c_peer_domain = ch_strdup( dnsname  );
 411     c->c_peer_name = ch_strdup( peername  );
 412     c->c_sock_name = ch_strdup( sockname );
 413
 414     c->c_n_ops_received = 0;
 415     c->c_n_ops_executing = 0;
 416     c->c_n_ops_pending = 0;
 417     c->c_n_ops_completed = 0;
 418
 419         c->c_n_get = 0;
 420         c->c_n_read = 0;
 421         c->c_n_write = 0;
 422
 423         /* assume LDAPv3 until bind */
 424         c->c_protocol = LDAP_VERSION3;
 425
 426     c->c_activitytime = c->c_starttime = slap_get_time();
 427
 428     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp, LBER_SBIOD_LEVEL_PROVIDER,
 429         (void *)&s );
 430     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 431         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 432 #ifdef LDAP_DEBUG
 433     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug, INT_MAX, NULL );
 434 #endif
 435     if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK, (void *)1 ) < 0 ) {
 436         Debug( LDAP_DEBUG_ANY,
 437             "connection_init(%d, %s): set nonblocking failed\n",
 438             s, c->c_peer_name,0 );
 439     }
 440
 441     id = c->c_connid = conn_nextid++;
 442
 443     c->c_conn_state = SLAP_C_INACTIVE;
 444     c->c_struct_state = SLAP_C_USED;
 445
 446 #ifdef HAVE_TLS
 447     if ( use_tls ) {
 448             c->c_is_tls = 1;
 449             c->c_needs_tls_accept = 1;
 450     } else {
 451             c->c_is_tls = 0;
 452             c->c_needs_tls_accept = 0;
 453     }
 454 #endif
 455
 456     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 457     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 458
 459     backend_connection_init(c);
 460
 461     return id;
 462 }
 463
 464 static void
 465 connection_destroy( Connection *c )
 466 {
 467         /* note: connections_mutex should be locked by caller */
 468     ber_socket_t        sd;
 469
 470     assert( connections != NULL );
 471     assert( c != NULL );
 472     assert( c->c_struct_state != SLAP_C_UNUSED );
 473     assert( c->c_conn_state != SLAP_C_INVALID );
 474     assert( c->c_ops == NULL );
 475
 476     backend_connection_destroy(c);
 477
 478     c->c_protocol = 0;
 479     c->c_connid = -1;
 480
 481     c->c_activitytime = c->c_starttime = 0;
 482
 483         if(c->c_authmech != NULL ) {
 484                 free(c->c_authmech);
 485                 c->c_authmech = NULL;
 486         }
 487     if(c->c_dn != NULL) {
 488         free(c->c_dn);
 489         c->c_dn = NULL;
 490     }
 491         if(c->c_cdn != NULL) {
 492                 free(c->c_cdn);
 493                 c->c_cdn = NULL;
 494         }
 495         if(c->c_listener_url != NULL) {
 496                 free(c->c_listener_url);
 497                 c->c_listener_url = NULL;
 498         }
 499         if(c->c_peer_domain != NULL) {
 500                 free(c->c_peer_domain);
 501                 c->c_peer_domain = NULL;
 502         }
 503         if(c->c_peer_name != NULL) {
 504 #ifdef LDAP_PF_LOCAL
 505                 /*
 506                  * If peer was a domain socket, unlink. Mind you,
 507                  * they may be un-named. Should we leave this to
 508                  * the client?
 509                  */
 510                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 511                         char *path = c->c_peer_name + 5;
 512                         if (path != '\0') {
 513                                 (void)unlink(path);
 514                         }
 515                 }
 516 #endif /* LDAP_PF_LOCAL */
 517                 free(c->c_peer_name);
 518                 c->c_peer_name = NULL;
 519         }
 520         if(c->c_sock_name != NULL) {
 521                 free(c->c_sock_name);
 522                 c->c_sock_name = NULL;
 523         }
 524
 525         c->c_sasl_bind_in_progress = 0;
 526         if(c->c_sasl_bind_mech != NULL) {
 527                 free(c->c_sasl_bind_mech);
 528                 c->c_sasl_bind_mech = NULL;
 529         }
 530 #ifdef HAVE_CYRUS_SASL
 531         if(c->c_sasl_bind_context != NULL ) {
 532                 sasl_dispose( &c->c_sasl_bind_context );
 533                 c->c_sasl_bind_context = NULL;
 534         }
 535 #endif
 536
 537         if ( c->c_currentber != NULL ) {
 538                 ber_free( c->c_currentber, 1 );
 539                 c->c_currentber = NULL;
 540         }
 541
 542         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 543         if ( sd != AC_SOCKET_INVALID ) {
 544                 slapd_remove( sd, 0 );
 545
 546                 Statslog( LDAP_DEBUG_STATS,
 547                     "conn=%ld fd=%d closed\n",
 548                         c->c_connid, sd, 0, 0, 0 );
 549         }
 550
 551         ber_sockbuf_free( c->c_sb );
 552         c->c_sb = ber_sockbuf_alloc( );
 553
 554     c->c_conn_state = SLAP_C_INVALID;
 555     c->c_struct_state = SLAP_C_UNUSED;
 556 }
 557
 558 int connection_state_closing( Connection *c )
 559 {
 560         /* c_mutex must be locked by caller */
 561
 562         int state;
 563         assert( c != NULL );
 564         assert( c->c_struct_state == SLAP_C_USED );
 565
 566         state = c->c_conn_state;
 567
 568         assert( state != SLAP_C_INVALID );
 569
 570         return state == SLAP_C_CLOSING;
 571 }
 572
 573 static void connection_abandon( Connection *c )
 574 {
 575         /* c_mutex must be locked by caller */
 576
 577         Operation *o;
 578
 579         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 580                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 581                 o->o_abandon = 1;
 582                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 583         }
 584
 585         /* remove pending operations */
 586         for( o = slap_op_pop( &c->c_pending_ops );
 587                 o != NULL;
 588                 o = slap_op_pop( &c->c_pending_ops ) )
 589         {
 590                 slap_op_free( o );
 591         }
 592 }
 593
 594 void connection_closing( Connection *c )
 595 {
 596         assert( connections != NULL );
 597         assert( c != NULL );
 598         assert( c->c_struct_state == SLAP_C_USED );
 599         assert( c->c_conn_state != SLAP_C_INVALID );
 600
 601         /* c_mutex must be locked by caller */
 602
 603         if( c->c_conn_state != SLAP_C_CLOSING ) {
 604                 ber_socket_t    sd;
 605
 606                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 607                 Debug( LDAP_DEBUG_TRACE,
 608                         "connection_closing: readying conn=%ld sd=%d for close\n",
 609                         c->c_connid, sd, 0 );
 610
 611                 /* update state to closing */
 612                 c->c_conn_state = SLAP_C_CLOSING;
 613
 614                 /* don't listen on this port anymore */
 615                 slapd_clr_read( sd, 1 );
 616
 617                 /* abandon active operations */
 618                 connection_abandon( c );
 619
 620                 /* wake write blocked operations */
 621                 slapd_clr_write( sd, 1 );
 622                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 623         }
 624 }
 625
 626 static void connection_close( Connection *c )
 627 {
 628         ber_socket_t    sd;
 629
 630         assert( connections != NULL );
 631         assert( c != NULL );
 632         assert( c->c_struct_state == SLAP_C_USED );
 633         assert( c->c_conn_state == SLAP_C_CLOSING );
 634
 635         /* note: connections_mutex and c_mutex should be locked by caller */
 636
 637         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 638         if( c->c_ops != NULL ) {
 639                 Debug( LDAP_DEBUG_TRACE,
 640                         "connection_close: deferring conn=%ld sd=%d\n",
 641                         c->c_connid, sd, 0 );
 642
 643                 return;
 644         }
 645
 646         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 647                 c->c_connid, sd, 0 );
 648
 649         connection_destroy( c );
 650 }
 651
 652 unsigned long connections_nextid(void)
 653 {
 654         unsigned long id;
 655         assert( connections != NULL );
 656
 657         ldap_pvt_thread_mutex_lock( &connections_mutex );
 658
 659         id = conn_nextid;
 660
 661         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 662
 663         return id;
 664 }
 665
 666 Connection* connection_first( ber_socket_t *index )
 667 {
 668         assert( connections != NULL );
 669         assert( index != NULL );
 670
 671         ldap_pvt_thread_mutex_lock( &connections_mutex );
 672
 673         *index = 0;
 674
 675         return connection_next(NULL, index);
 676 }
 677
 678 Connection* connection_next( Connection *c, ber_socket_t *index )
 679 {
 680         assert( connections != NULL );
 681         assert( index != NULL );
 682         assert( *index <= dtblsize );
 683
 684         if( c != NULL ) {
 685                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 686         }
 687
 688         c = NULL;
 689
 690         for(; *index < dtblsize; (*index)++) {
 691                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 692                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 693 #ifndef HAVE_WINSOCK
 694                         continue;
 695 #else
 696                         break;
 697 #endif
 698                 }
 699
 700                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 701                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 702                         c = &connections[(*index)++];
 703                         break;
 704                 }
 705
 706                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 707                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 708         }
 709
 710         if( c != NULL ) {
 711                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 712         }
 713
 714         return c;
 715 }
 716
 717 void connection_done( Connection *c )
 718 {
 719         assert( connections != NULL );
 720
 721         if( c != NULL ) {
 722                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 723         }
 724
 725         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 726 }
 727
 728 /*
 729  * connection_activity - handle the request operation op on connection
 730  * conn.  This routine figures out what kind of operation it is and
 731  * calls the appropriate stub to handle it.
 732  */
 733
 734 static void *
 735 connection_operation( void *arg_v )
 736 {
 737         int rc;
 738         struct co_arg   *arg = arg_v;
 739         ber_tag_t tag = arg->co_op->o_tag;
 740         Connection *conn = arg->co_conn;
 741
 742         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 743         num_ops_initiated++;
 744         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 745
 746         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 747                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 748                         "error: SASL bind in progress (tag=%ld).\n",
 749                         (long) tag, 0, 0 );
 750                 send_ldap_result( conn, arg->co_op,
 751                         rc = LDAP_OPERATIONS_ERROR,
 752                         NULL, "SASL bind in progress", NULL, NULL );
 753                 goto operations_error;
 754         }
 755
 756         switch ( tag ) {
 757         case LDAP_REQ_BIND:
 758                 rc = do_bind( conn, arg->co_op );
 759                 break;
 760
 761         case LDAP_REQ_UNBIND:
 762                 rc = do_unbind( conn, arg->co_op );
 763                 break;
 764
 765         case LDAP_REQ_ADD:
 766                 rc = do_add( conn, arg->co_op );
 767                 break;
 768
 769         case LDAP_REQ_DELETE:
 770                 rc = do_delete( conn, arg->co_op );
 771                 break;
 772
 773         case LDAP_REQ_MODRDN:
 774                 rc = do_modrdn( conn, arg->co_op );
 775                 break;
 776
 777         case LDAP_REQ_MODIFY:
 778                 rc = do_modify( conn, arg->co_op );
 779                 break;
 780
 781         case LDAP_REQ_COMPARE:
 782                 rc = do_compare( conn, arg->co_op );
 783                 break;
 784
 785         case LDAP_REQ_SEARCH:
 786                 rc = do_search( conn, arg->co_op );
 787                 break;
 788
 789         case LDAP_REQ_ABANDON:
 790                 rc = do_abandon( conn, arg->co_op );
 791                 break;
 792
 793         case LDAP_REQ_EXTENDED:
 794                 rc = do_extended( conn, arg->co_op );
 795                 break;
 796
 797         default:
 798                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 799                     tag, 0, 0 );
 800                 arg->co_op->o_tag = LBER_ERROR;
 801                 send_ldap_disconnect( conn, arg->co_op,
 802                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 803                 rc = -1;
 804                 break;
 805         }
 806
 807         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 808
 809 operations_error:
 810         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 811         num_ops_completed++;
 812         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 813
 814         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 815
 816         conn->c_n_ops_executing--;
 817         conn->c_n_ops_completed++;
 818
 819         slap_op_remove( &conn->c_ops, arg->co_op );
 820         slap_op_free( arg->co_op );
 821         arg->co_op = NULL;
 822         arg->co_conn = NULL;
 823         free( (char *) arg );
 824         arg = NULL;
 825
 826         switch( tag ) {
 827         case LBER_ERROR:
 828         case LDAP_REQ_UNBIND:
 829                 /* c_mutex is locked */
 830                 connection_closing( conn );
 831                 break;
 832
 833         case LDAP_REQ_BIND:
 834                 conn->c_sasl_bind_in_progress =
 835                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
 836
 837                 if( conn->c_conn_state == SLAP_C_BINDING) {
 838                         conn->c_conn_state = SLAP_C_ACTIVE;
 839                 }
 840         }
 841
 842         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 843         active_threads--;
 844         if( active_threads < 1 ) {
 845                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 846         }
 847         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 848
 849         connection_resched( conn );
 850
 851         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 852
 853         return NULL;
 854 }
 855
 856 int connection_read(ber_socket_t s)
 857 {
 858         int rc = 0;
 859         Connection *c;
 860         assert( connections != NULL );
 861
 862         ldap_pvt_thread_mutex_lock( &connections_mutex );
 863
 864         /* get (locked) connection */
 865         c = connection_get( s );
 866
 867         if( c == NULL ) {
 868                 Debug( LDAP_DEBUG_ANY,
 869                         "connection_read(%ld): no connection!\n",
 870                         (long) s, 0, 0 );
 871
 872                 slapd_remove(s, 0);
 873
 874                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 875                 return -1;
 876         }
 877
 878         c->c_n_read++;
 879
 880         if( c->c_conn_state == SLAP_C_CLOSING ) {
 881                 Debug( LDAP_DEBUG_TRACE,
 882                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 883                         s, c->c_connid, 0 );
 884
 885                 connection_return( c );
 886                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 887                 return 0;
 888         }
 889
 890         Debug( LDAP_DEBUG_TRACE,
 891                 "connection_read(%d): checking for input on id=%ld\n",
 892                 s, c->c_connid, 0 );
 893
 894 #ifdef HAVE_TLS
 895         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 896                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 897                 if ( rc < 0 ) {
 898                         struct timeval tv;
 899                         fd_set rfd;
 900
 901                         Debug( LDAP_DEBUG_TRACE,
 902                                "connection_read(%d): TLS accept error error=%d id=%ld, closing\n",
 903                                s, rc, c->c_connid );
 904
 905                         c->c_needs_tls_accept = 0;
 906                         /* connections_mutex and c_mutex are locked */
 907                         connection_closing( c );
 908
 909                         /* Drain input before close, to allow SSL error codes
 910                          * to propagate to client. */
 911                         FD_ZERO(&rfd);
 912                         FD_SET(s, &rfd);
 913                         for (rc=1; rc>0;)
 914                         {
 915                             tv.tv_sec = 1;
 916                             tv.tv_usec = 0;
 917                             rc = select(s+1, &rfd, NULL, NULL, &tv);
 918                             if (rc == 1)
 919                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN,
 920                                     NULL);
 921                         }
 922                         connection_close( c );
 923                 } else if ( rc == 0 ) {
 924                         c->c_needs_tls_accept = 0;
 925                 }
 926                 connection_return( c );
 927                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 928                 return 0;
 929         }
 930 #endif
 931
 932 #define CONNECTION_INPUT_LOOP 1
 933
 934 #ifdef DATA_READY_LOOP
 935         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_DATA_READY, NULL ) )
 936 #elif CONNECTION_INPUT_LOOP
 937         while(!rc)
 938 #endif
 939         {
 940                 /* How do we do this without getting into a busy loop ? */
 941                 rc = connection_input( c );
 942         }
 943
 944         if( rc < 0 ) {
 945                 Debug( LDAP_DEBUG_TRACE,
 946                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 947                         s, rc, c->c_connid );
 948
 949                 /* connections_mutex and c_mutex are locked */
 950                 connection_closing( c );
 951                 connection_close( c );
 952         }
 953
 954         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
 955                 slapd_set_read( s, 1 );
 956         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
 957                 slapd_set_write( s, 1 );
 958         connection_return( c );
 959         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 960         return 0;
 961 }
 962
 963 static int
 964 connection_input(
 965     Connection *conn
 966 )
 967 {
 968         Operation *op;
 969         ber_tag_t       tag;
 970         ber_len_t       len;
 971         ber_int_t       msgid;
 972         BerElement      *ber;
 973
 974         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 975             == NULL ) {
 976                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 977                 return -1;
 978         }
 979
 980         errno = 0;
 981         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 982             != LDAP_TAG_MESSAGE )
 983         {
 984                 int err = errno;
 985                 ber_socket_t    sd;
 986
 987                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
 988
 989                 Debug( LDAP_DEBUG_TRACE,
 990                         "ber_get_next on fd %d failed errno=%d (%s)\n",
 991                         sd, err, sock_errstr(err) );
 992
 993                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 994                         /* log, close and send error */
 995                         ber_free( conn->c_currentber, 1 );
 996                         conn->c_currentber = NULL;
 997
 998                         return -2;
 999                 }
1000                 return 1;
1001         }
1002
1003         ber = conn->c_currentber;
1004         conn->c_currentber = NULL;
1005
1006         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1007                 /* log, close and send error */
1008                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
1009                     0 );
1010                 ber_free( ber, 1 );
1011                 return -1;
1012         }
1013
1014         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1015                 /* log, close and send error */
1016                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
1017                     0 );
1018                 ber_free( ber, 1 );
1019
1020                 return -1;
1021         }
1022
1023         if(tag == LDAP_REQ_BIND) {
1024                 /* immediately abandon all exiting operations upon BIND */
1025                 connection_abandon( conn );
1026         }
1027
1028         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1029
1030         if ( conn->c_conn_state == SLAP_C_BINDING
1031                 || conn->c_conn_state == SLAP_C_CLOSING )
1032         {
1033                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1034                 conn->c_n_ops_pending++;
1035                 slap_op_add( &conn->c_pending_ops, op );
1036
1037         } else {
1038                 conn->c_n_ops_executing++;
1039                 connection_op_activate( conn, op );
1040         }
1041
1042 #ifdef NO_THREADS
1043         if ( conn->c_struct_state != SLAP_C_USED ) {
1044                 /* connection must have got closed underneath us */
1045                 return 1;
1046         }
1047 #endif
1048         assert( conn->c_struct_state == SLAP_C_USED );
1049
1050         return 0;
1051 }
1052
1053 static int
1054 connection_resched( Connection *conn )
1055 {
1056         Operation *op;
1057
1058         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1059                 ber_socket_t    sd;
1060
1061                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1062                 Debug( LDAP_DEBUG_TRACE,
1063                         "connection_resched: attempting closing conn=%ld sd=%d\n",
1064                         conn->c_connid, sd, 0 );
1065
1066                 connection_close( conn );
1067                 return 0;
1068         }
1069
1070         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1071                 /* other states need different handling */
1072                 return 0;
1073         }
1074
1075         for( op = slap_op_pop( &conn->c_pending_ops );
1076                 op != NULL;
1077                 op = slap_op_pop( &conn->c_pending_ops ) )
1078         {
1079                 /* pending operations should not be marked for abandonment */
1080                 assert(!op->o_abandon);
1081
1082                 conn->c_n_ops_pending--;
1083                 conn->c_n_ops_executing++;
1084
1085                 connection_op_activate( conn, op );
1086
1087                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1088                         break;
1089                 }
1090         }
1091         return 0;
1092 }
1093
1094 static int connection_op_activate( Connection *conn, Operation *op )
1095 {
1096         struct co_arg *arg;
1097         char *tmpdn;
1098         int status;
1099         ber_tag_t tag = op->o_tag;
1100
1101         if(tag == LDAP_REQ_BIND) {
1102                 conn->c_conn_state = SLAP_C_BINDING;
1103         }
1104
1105         if ( conn->c_dn != NULL ) {
1106                 tmpdn = ch_strdup( conn->c_dn );
1107         } else {
1108                 tmpdn = NULL;
1109         }
1110
1111         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1112         arg->co_conn = conn;
1113         arg->co_op = op;
1114
1115         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1116         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1117         (void) dn_normalize( arg->co_op->o_ndn );
1118
1119         arg->co_op->o_protocol = conn->c_protocol;
1120         arg->co_op->o_connid = conn->c_connid;
1121
1122         arg->co_op->o_authtype = conn->c_authtype;
1123         arg->co_op->o_authmech = conn->c_authmech != NULL
1124                 ?  ch_strdup( conn->c_authmech ) : NULL;
1125
1126         slap_op_add( &conn->c_ops, arg->co_op );
1127
1128         if( tmpdn != NULL ) {
1129                 free( tmpdn );
1130         }
1131
1132         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1133         active_threads++;
1134         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1135
1136         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
1137                                          connection_operation, (void *) arg );
1138
1139         if ( status != 0 ) {
1140                 Debug( LDAP_DEBUG_ANY,
1141                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1142
1143                 /* should move op to pending list */
1144         }
1145
1146         return status;
1147 }
1148
1149 int connection_write(ber_socket_t s)
1150 {
1151         Connection *c;
1152         assert( connections != NULL );
1153
1154         ldap_pvt_thread_mutex_lock( &connections_mutex );
1155
1156         c = connection_get( s );
1157
1158         slapd_clr_write( s, 0);
1159
1160         if( c == NULL ) {
1161                 Debug( LDAP_DEBUG_ANY,
1162                         "connection_write(%ld): no connection!\n",
1163                         (long) s, 0, 0 );
1164                 slapd_remove(s, 0);
1165                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1166                 return -1;
1167         }
1168
1169         c->c_n_write++;
1170
1171         Debug( LDAP_DEBUG_TRACE,
1172                 "connection_write(%d): waking output for id=%ld\n",
1173                 s, c->c_connid, 0 );
1174
1175         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1176
1177         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
1178                 slapd_set_read( s, 1 );
1179         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
1180                 slapd_set_write( s, 1 );
1181         connection_return( c );
1182         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1183         return 0;
1184 }