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

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-1999 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 /* we need LBER internals */
  20 #include "../../libraries/liblber/lber-int.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;
 217
 218                 for(i=0; i<dtblsize; i++) {
 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( !ber_pvt_sb_in_use( connections[i].c_sb ) );
 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( ber_pvt_sb_get_desc( connections[i].c_sb ) == s ) {
 236                                 c = &connections[i];
 237                                 break;
 238                         }
 239                 }
 240         }
 241 #endif
 242
 243         if( c != NULL ) {
 244                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 245
 246                 if( c->c_struct_state != SLAP_C_USED ) {
 247                         /* connection must have been closed due to resched */
 248
 249                         assert( c->c_conn_state == SLAP_C_INVALID );
 250                         assert( !ber_pvt_sb_in_use( c->c_sb ) );
 251
 252                         Debug( LDAP_DEBUG_TRACE,
 253                                 "connection_get(%d): connection not used\n",
 254                                 s, 0, 0 );
 255
 256                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 257                         return NULL;
 258                 }
 259
 260                 Debug( LDAP_DEBUG_TRACE,
 261                         "connection_get(%d): got connid=%ld\n",
 262                         s, c->c_connid, 0 );
 263
 264                 c->c_n_get++;
 265
 266                 assert( c->c_struct_state == SLAP_C_USED );
 267                 assert( c->c_conn_state != SLAP_C_INVALID );
 268                 assert( ber_pvt_sb_in_use( c->c_sb ) );
 269
 270         c->c_activitytime = slap_get_time();
 271         }
 272
 273         return c;
 274 }
 275
 276 static void connection_return( Connection *c )
 277 {
 278         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 279 }
 280
 281 long connection_init(
 282         ber_socket_t s,
 283         const char* url,
 284         const char* dnsname,
 285         const char* peername,
 286         const char* sockname,
 287         int use_tls )
 288 {
 289         unsigned long id;
 290         Connection *c;
 291
 292         assert( connections != NULL );
 293
 294         assert( dnsname != NULL );
 295         assert( peername != NULL );
 296         assert( sockname != NULL );
 297
 298 #ifndef HAVE_TLS
 299         assert( !use_tls );
 300 #endif
 301
 302         if( s == AC_SOCKET_INVALID ) {
 303         Debug( LDAP_DEBUG_ANY,
 304                         "connection_init(%ld): invalid.\n",
 305                         (long) s, 0, 0 );
 306                 return -1;
 307         }
 308
 309         assert( s >= 0 );
 310 #ifndef HAVE_WINSOCK
 311         assert( s < dtblsize );
 312 #endif
 313
 314         ldap_pvt_thread_mutex_lock( &connections_mutex );
 315
 316 #ifndef HAVE_WINSOCK
 317         c = &connections[s];
 318
 319 #else
 320         {
 321                 unsigned int i;
 322
 323                 c = NULL;
 324
 325         for( i=0; i < dtblsize; i++) {
 326             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 327                 assert( connections[i].c_sb == 0 );
 328                 c = &connections[i];
 329                 break;
 330             }
 331
 332             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 333                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
 334                 c = &connections[i];
 335                 break;
 336             }
 337
 338             assert( connections[i].c_struct_state == SLAP_C_USED );
 339             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 340             assert( ber_pvt_sb_in_use( connections[i].c_sb ));
 341         }
 342
 343         if( c == NULL ) {
 344                 Debug( LDAP_DEBUG_ANY,
 345                                 "connection_init(%d): connection table full (%d/%d)\n",
 346                                 s, i, dtblsize);
 347             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 348             return -1;
 349         }
 350     }
 351 #endif
 352
 353     assert( c != NULL );
 354
 355     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 356                 c->c_authmech = NULL;
 357         c->c_dn = NULL;
 358         c->c_cdn = NULL;
 359
 360                 c->c_listener_url = NULL;
 361                 c->c_peer_domain = NULL;
 362         c->c_peer_name = NULL;
 363         c->c_sock_name = NULL;
 364
 365         c->c_ops = NULL;
 366         c->c_pending_ops = NULL;
 367
 368                 c->c_sasl_bind_mech = NULL;
 369 #ifdef HAVE_CYRUS_SASL
 370                 c->c_sasl_bind_context = NULL;
 371 #endif
 372
 373         c->c_sb = ber_sockbuf_alloc( );
 374                 c->c_currentber = NULL;
 375
 376         /* should check status of thread calls */
 377         ldap_pvt_thread_mutex_init( &c->c_mutex );
 378         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 379         ldap_pvt_thread_cond_init( &c->c_write_cv );
 380
 381         c->c_struct_state = SLAP_C_UNUSED;
 382     }
 383
 384     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 385
 386     assert( c->c_struct_state == SLAP_C_UNUSED );
 387         assert( c->c_authmech == NULL );
 388     assert(     c->c_dn == NULL );
 389     assert(     c->c_cdn == NULL );
 390     assert( c->c_listener_url == NULL );
 391     assert( c->c_peer_domain == NULL );
 392     assert( c->c_peer_name == NULL );
 393     assert( c->c_sock_name == NULL );
 394     assert( c->c_ops == NULL );
 395     assert( c->c_pending_ops == NULL );
 396         assert( c->c_sasl_bind_mech == NULL );
 397 #ifdef HAVE_CYRUS_SASL
 398         assert( c->c_sasl_bind_context == NULL );
 399 #endif
 400         assert( c->c_currentber == NULL );
 401
 402         c->c_listener_url = ch_strdup( url  );
 403         c->c_peer_domain = ch_strdup( dnsname  );
 404     c->c_peer_name = ch_strdup( peername  );
 405     c->c_sock_name = ch_strdup( sockname );
 406
 407     c->c_n_ops_received = 0;
 408     c->c_n_ops_executing = 0;
 409     c->c_n_ops_pending = 0;
 410     c->c_n_ops_completed = 0;
 411
 412         c->c_n_get = 0;
 413         c->c_n_read = 0;
 414         c->c_n_write = 0;
 415
 416         /* assume LDAPv3 until bind */
 417         c->c_protocol = LDAP_VERSION3;
 418
 419     c->c_activitytime = c->c_starttime = slap_get_time();
 420
 421     ber_pvt_sb_set_desc( c->c_sb, s );
 422     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 423
 424     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 425         Debug( LDAP_DEBUG_ANY,
 426             "connection_init(%d, %s): set nonblocking failed\n",
 427             s, c->c_peer_name,0 );
 428     }
 429
 430     id = c->c_connid = conn_nextid++;
 431
 432     c->c_conn_state = SLAP_C_INACTIVE;
 433     c->c_struct_state = SLAP_C_USED;
 434
 435 #ifdef HAVE_TLS
 436     if ( use_tls ) {
 437             c->c_is_tls = 1;
 438             c->c_needs_tls_accept = 1;
 439     } else {
 440             c->c_is_tls = 0;
 441             c->c_needs_tls_accept = 0;
 442     }
 443 #endif
 444
 445     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 446     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 447
 448     backend_connection_init(c);
 449
 450     return id;
 451 }
 452
 453 static void
 454 connection_destroy( Connection *c )
 455 {
 456         /* note: connections_mutex should be locked by caller */
 457
 458     assert( connections != NULL );
 459     assert( c != NULL );
 460     assert( c->c_struct_state != SLAP_C_UNUSED );
 461     assert( c->c_conn_state != SLAP_C_INVALID );
 462     assert( c->c_ops == NULL );
 463
 464     backend_connection_destroy(c);
 465
 466     c->c_protocol = 0;
 467     c->c_connid = -1;
 468
 469     c->c_activitytime = c->c_starttime = 0;
 470
 471         if(c->c_authmech != NULL ) {
 472                 free(c->c_authmech);
 473                 c->c_authmech = NULL;
 474         }
 475     if(c->c_dn != NULL) {
 476         free(c->c_dn);
 477         c->c_dn = NULL;
 478     }
 479         if(c->c_cdn != NULL) {
 480                 free(c->c_cdn);
 481                 c->c_cdn = NULL;
 482         }
 483         if(c->c_listener_url != NULL) {
 484                 free(c->c_listener_url);
 485                 c->c_listener_url = NULL;
 486         }
 487         if(c->c_peer_domain != NULL) {
 488                 free(c->c_peer_domain);
 489                 c->c_peer_domain = NULL;
 490         }
 491         if(c->c_peer_name != NULL) {
 492 #ifdef LDAP_PF_LOCAL
 493                 /*
 494                  * If peer was a domain socket, unlink. Mind you,
 495                  * they may be un-named. Should we leave this to
 496                  * the client?
 497                  */
 498                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 499                         char *path = c->c_peer_name + 5;
 500                         if (path != '\0') {
 501                                 (void)unlink(path);
 502                         }
 503                 }
 504 #endif /* LDAP_PF_LOCAL */
 505                 free(c->c_peer_name);
 506                 c->c_peer_name = NULL;
 507         }
 508         if(c->c_sock_name != NULL) {
 509                 free(c->c_sock_name);
 510                 c->c_sock_name = NULL;
 511         }
 512
 513         c->c_sasl_bind_in_progress = 0;
 514         if(c->c_sasl_bind_mech != NULL) {
 515                 free(c->c_sasl_bind_mech);
 516                 c->c_sasl_bind_mech = NULL;
 517         }
 518 #ifdef HAVE_CYRUS_SASL
 519         if(c->c_sasl_bind_context != NULL ) {
 520                 sasl_dispose( &c->c_sasl_bind_context );
 521                 c->c_sasl_bind_context = NULL;
 522         }
 523 #endif
 524
 525         if ( c->c_currentber != NULL ) {
 526                 ber_free( c->c_currentber, 1 );
 527                 c->c_currentber = NULL;
 528         }
 529
 530         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 531                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 532
 533                 slapd_remove( sd, 0 );
 534                 ber_pvt_sb_close( c->c_sb );
 535
 536                 Statslog( LDAP_DEBUG_STATS,
 537                     "conn=%ld fd=%d closed\n",
 538                         c->c_connid, sd, 0, 0, 0 );
 539         }
 540
 541         ber_pvt_sb_destroy( c->c_sb );
 542
 543     c->c_conn_state = SLAP_C_INVALID;
 544     c->c_struct_state = SLAP_C_UNUSED;
 545 }
 546
 547 int connection_state_closing( Connection *c )
 548 {
 549         /* c_mutex must be locked by caller */
 550
 551         int state;
 552         assert( c != NULL );
 553         assert( c->c_struct_state == SLAP_C_USED );
 554
 555         state = c->c_conn_state;
 556
 557         assert( state != SLAP_C_INVALID );
 558
 559         return state == SLAP_C_CLOSING;
 560 }
 561
 562 static void connection_abandon( Connection *c )
 563 {
 564         /* c_mutex must be locked by caller */
 565
 566         Operation *o;
 567
 568         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 569                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 570                 o->o_abandon = 1;
 571                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 572         }
 573
 574         /* remove pending operations */
 575         for( o = slap_op_pop( &c->c_pending_ops );
 576                 o != NULL;
 577                 o = slap_op_pop( &c->c_pending_ops ) )
 578         {
 579                 slap_op_free( o );
 580         }
 581 }
 582
 583 void connection_closing( Connection *c )
 584 {
 585         assert( connections != NULL );
 586         assert( c != NULL );
 587         assert( c->c_struct_state == SLAP_C_USED );
 588         assert( c->c_conn_state != SLAP_C_INVALID );
 589
 590         /* c_mutex must be locked by caller */
 591
 592         if( c->c_conn_state != SLAP_C_CLOSING ) {
 593
 594                 Debug( LDAP_DEBUG_TRACE,
 595                         "connection_closing: readying conn=%ld sd=%d for close\n",
 596                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 597
 598                 /* update state to closing */
 599                 c->c_conn_state = SLAP_C_CLOSING;
 600
 601                 /* don't listen on this port anymore */
 602                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 603
 604                 /* shutdown I/O -- not yet implemented */
 605
 606                 /* abandon active operations */
 607                 connection_abandon( c );
 608
 609                 /* wake write blocked operations */
 610                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 611                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 612         }
 613 }
 614
 615 static void connection_close( Connection *c )
 616 {
 617         assert( connections != NULL );
 618         assert( c != NULL );
 619         assert( c->c_struct_state == SLAP_C_USED );
 620         assert( c->c_conn_state == SLAP_C_CLOSING );
 621
 622         /* note: connections_mutex and c_mutex should be locked by caller */
 623
 624         if( c->c_ops != NULL ) {
 625                 Debug( LDAP_DEBUG_TRACE,
 626                         "connection_close: deferring conn=%ld sd=%d\n",
 627                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 628
 629                 return;
 630         }
 631
 632         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 633                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 634
 635         connection_destroy( c );
 636 }
 637
 638 unsigned long connections_nextid(void)
 639 {
 640         unsigned long id;
 641         assert( connections != NULL );
 642
 643         ldap_pvt_thread_mutex_lock( &connections_mutex );
 644
 645         id = conn_nextid;
 646
 647         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 648
 649         return id;
 650 }
 651
 652 Connection* connection_first( ber_socket_t *index )
 653 {
 654         assert( connections != NULL );
 655         assert( index != NULL );
 656
 657         ldap_pvt_thread_mutex_lock( &connections_mutex );
 658
 659         *index = 0;
 660
 661         return connection_next(NULL, index);
 662 }
 663
 664 Connection* connection_next( Connection *c, ber_socket_t *index )
 665 {
 666         assert( connections != NULL );
 667         assert( index != NULL );
 668         assert( *index <= dtblsize );
 669
 670         if( c != NULL ) {
 671                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 672         }
 673
 674         c = NULL;
 675
 676         for(; *index < dtblsize; (*index)++) {
 677                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 678                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 679 #ifndef HAVE_WINSOCK
 680                         continue;
 681 #else
 682                         break;
 683 #endif
 684                 }
 685
 686                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 687                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 688                         c = &connections[(*index)++];
 689                         break;
 690                 }
 691
 692                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 693                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 694         }
 695
 696         if( c != NULL ) {
 697                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 698         }
 699
 700         return c;
 701 }
 702
 703 void connection_done( Connection *c )
 704 {
 705         assert( connections != NULL );
 706
 707         if( c != NULL ) {
 708                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 709         }
 710
 711         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 712 }
 713
 714 /*
 715  * connection_activity - handle the request operation op on connection
 716  * conn.  This routine figures out what kind of operation it is and
 717  * calls the appropriate stub to handle it.
 718  */
 719
 720 static void *
 721 connection_operation( void *arg_v )
 722 {
 723         int rc;
 724         struct co_arg   *arg = arg_v;
 725         ber_tag_t tag = arg->co_op->o_tag;
 726         Connection *conn = arg->co_conn;
 727
 728         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 729         num_ops_initiated++;
 730         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 731
 732         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 733                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 734                         "error: SASL bind in progress (tag=%ld).\n",
 735                         (long) tag, 0, 0 );
 736                 send_ldap_result( conn, arg->co_op,
 737                         rc = LDAP_OPERATIONS_ERROR,
 738                         NULL, "SASL bind in progress", NULL, NULL );
 739                 goto operations_error;
 740         }
 741
 742         switch ( tag ) {
 743         case LDAP_REQ_BIND:
 744                 rc = do_bind( conn, arg->co_op );
 745                 break;
 746
 747         case LDAP_REQ_UNBIND:
 748                 rc = do_unbind( conn, arg->co_op );
 749                 break;
 750
 751         case LDAP_REQ_ADD:
 752                 rc = do_add( conn, arg->co_op );
 753                 break;
 754
 755         case LDAP_REQ_DELETE:
 756                 rc = do_delete( conn, arg->co_op );
 757                 break;
 758
 759         case LDAP_REQ_MODRDN:
 760                 rc = do_modrdn( conn, arg->co_op );
 761                 break;
 762
 763         case LDAP_REQ_MODIFY:
 764                 rc = do_modify( conn, arg->co_op );
 765                 break;
 766
 767         case LDAP_REQ_COMPARE:
 768                 rc = do_compare( conn, arg->co_op );
 769                 break;
 770
 771         case LDAP_REQ_SEARCH:
 772                 rc = do_search( conn, arg->co_op );
 773                 break;
 774
 775         case LDAP_REQ_ABANDON:
 776                 rc = do_abandon( conn, arg->co_op );
 777                 break;
 778
 779         case LDAP_REQ_EXTENDED:
 780                 rc = do_extended( conn, arg->co_op );
 781                 break;
 782
 783         default:
 784                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 785                     tag, 0, 0 );
 786                 arg->co_op->o_tag = LBER_ERROR;
 787                 send_ldap_disconnect( conn, arg->co_op,
 788                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 789                 rc = -1;
 790                 break;
 791         }
 792
 793         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 794
 795 operations_error:
 796         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 797         num_ops_completed++;
 798         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 799
 800         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 801
 802         conn->c_n_ops_executing--;
 803         conn->c_n_ops_completed++;
 804
 805         slap_op_remove( &conn->c_ops, arg->co_op );
 806         slap_op_free( arg->co_op );
 807         arg->co_op = NULL;
 808         arg->co_conn = NULL;
 809         free( (char *) arg );
 810         arg = NULL;
 811
 812         switch( tag ) {
 813         case LBER_ERROR:
 814         case LDAP_REQ_UNBIND:
 815                 /* c_mutex is locked */
 816                 connection_closing( conn );
 817                 break;
 818
 819         case LDAP_REQ_BIND:
 820                 if( conn->c_conn_state == SLAP_C_BINDING) {
 821                         conn->c_conn_state = SLAP_C_ACTIVE;
 822                 }
 823                 /*
 824                  * Is this ever the case? For now, rely on
 825                  * the backend to set this.
 826                  */
 827                 if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 828                         conn->c_sasl_bind_in_progress = 1;
 829                 }
 830         }
 831
 832         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 833         active_threads--;
 834         if( active_threads < 1 ) {
 835                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 836         }
 837         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 838
 839         connection_resched( conn );
 840
 841         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 842
 843         return NULL;
 844 }
 845
 846 int connection_read(ber_socket_t s)
 847 {
 848         int rc = 0;
 849         Connection *c;
 850         assert( connections != NULL );
 851
 852         ldap_pvt_thread_mutex_lock( &connections_mutex );
 853
 854         /* get (locked) connection */
 855         c = connection_get( s );
 856
 857         if( c == NULL ) {
 858                 Debug( LDAP_DEBUG_ANY,
 859                         "connection_read(%ld): no connection!\n",
 860                         (long) s, 0, 0 );
 861
 862                 slapd_remove(s, 0);
 863
 864                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 865                 return -1;
 866         }
 867
 868         c->c_n_read++;
 869
 870         if( c->c_conn_state == SLAP_C_CLOSING ) {
 871                 Debug( LDAP_DEBUG_TRACE,
 872                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 873                         s, c->c_connid, 0 );
 874
 875                 connection_return( c );
 876                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 877                 return 0;
 878         }
 879
 880         Debug( LDAP_DEBUG_TRACE,
 881                 "connection_read(%d): checking for input on id=%ld\n",
 882                 s, c->c_connid, 0 );
 883
 884 #ifdef HAVE_TLS
 885         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 886                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 887                 if ( rc < 0 ) {
 888                         Debug( LDAP_DEBUG_TRACE,
 889                                "connection_read(%d): TLS accept error error=%d id=%ld, closing\n",
 890                                s, rc, c->c_connid );
 891
 892                         c->c_needs_tls_accept = 0;
 893                         /* connections_mutex and c_mutex are locked */
 894                         connection_closing( c );
 895                         connection_close( c );
 896                 } else if ( rc == 0 ) {
 897                         c->c_needs_tls_accept = 0;
 898                 }
 899                 connection_return( c );
 900                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 901                 return 0;
 902         }
 903 #endif
 904
 905 #define CONNECTION_INPUT_LOOP 1
 906
 907 #ifdef DATA_READY_LOOP
 908         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 909 #elif CONNECTION_INPUT_LOOP
 910         while(!rc)
 911 #endif
 912         {
 913                 /* How do we do this without getting into a busy loop ? */
 914                 rc = connection_input( c );
 915         }
 916
 917         if( rc < 0 ) {
 918                 Debug( LDAP_DEBUG_TRACE,
 919                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 920                         s, rc, c->c_connid );
 921
 922                 /* connections_mutex and c_mutex are locked */
 923                 connection_closing( c );
 924                 connection_close( c );
 925         }
 926
 927         if ( ber_pvt_sb_needs_read( c->c_sb ) )
 928                 slapd_set_read( s, 1 );
 929         if ( ber_pvt_sb_needs_write( c->c_sb ) )
 930                 slapd_set_write( s, 1 );
 931         connection_return( c );
 932         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 933         return 0;
 934 }
 935
 936 static int
 937 connection_input(
 938     Connection *conn
 939 )
 940 {
 941         Operation *op;
 942         ber_tag_t       tag;
 943         ber_len_t       len;
 944         ber_int_t       msgid;
 945         BerElement      *ber;
 946
 947         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 948             == NULL ) {
 949                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 950                 return -1;
 951         }
 952
 953         errno = 0;
 954         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 955             != LDAP_TAG_MESSAGE )
 956         {
 957                 int err = errno;
 958
 959                 Debug( LDAP_DEBUG_TRACE,
 960                         "ber_get_next on fd %d failed errno=%d (%s)\n",
 961                         ber_pvt_sb_get_desc( conn->c_sb ), err, STRERROR(err) );
 962                 Debug( LDAP_DEBUG_TRACE,
 963                         "\t*** got %ld of %lu so far\n",
 964                         (long) ( conn->c_currentber->ber_buf
 965                                 ?  conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf
 966                                 : 0 ),
 967                         (long) conn->c_currentber->ber_len, 0 );
 968
 969                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 970                         /* log, close and send error */
 971                         ber_free( conn->c_currentber, 1 );
 972                         conn->c_currentber = NULL;
 973
 974                         return -2;
 975                 }
 976                 return 1;
 977         }
 978
 979         ber = conn->c_currentber;
 980         conn->c_currentber = NULL;
 981
 982         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 983                 /* log, close and send error */
 984                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 985                     0 );
 986                 ber_free( ber, 1 );
 987                 return -1;
 988         }
 989
 990         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 991                 /* log, close and send error */
 992                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 993                     0 );
 994                 ber_free( ber, 1 );
 995
 996                 return -1;
 997         }
 998
 999         if(tag == LDAP_REQ_BIND) {
1000                 /* immediately abandon all exiting operations upon BIND */
1001                 connection_abandon( conn );
1002         }
1003
1004         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1005
1006         if ( conn->c_conn_state == SLAP_C_BINDING
1007                 || conn->c_conn_state == SLAP_C_CLOSING )
1008         {
1009                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1010                 conn->c_n_ops_pending++;
1011                 slap_op_add( &conn->c_pending_ops, op );
1012
1013         } else {
1014                 conn->c_n_ops_executing++;
1015                 connection_op_activate( conn, op );
1016         }
1017
1018 #ifdef NO_THREADS
1019         if ( conn->c_struct_state != SLAP_C_USED ) {
1020                 /* connection must have got closed underneath us */
1021                 return 1;
1022         }
1023 #endif
1024         assert( conn->c_struct_state == SLAP_C_USED );
1025
1026         return 0;
1027 }
1028
1029 static int
1030 connection_resched( Connection *conn )
1031 {
1032         Operation *op;
1033
1034         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1035                 Debug( LDAP_DEBUG_TRACE,
1036                         "connection_resched: attempting closing conn=%ld sd=%d\n",
1037                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
1038
1039                 connection_close( conn );
1040                 return 0;
1041         }
1042
1043         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1044                 /* other states need different handling */
1045                 return 0;
1046         }
1047
1048         for( op = slap_op_pop( &conn->c_pending_ops );
1049                 op != NULL;
1050                 op = slap_op_pop( &conn->c_pending_ops ) )
1051         {
1052                 /* pending operations should not be marked for abandonment */
1053                 assert(!op->o_abandon);
1054
1055                 conn->c_n_ops_pending--;
1056                 conn->c_n_ops_executing++;
1057
1058                 connection_op_activate( conn, op );
1059
1060                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1061                         break;
1062                 }
1063         }
1064         return 0;
1065 }
1066
1067 static int connection_op_activate( Connection *conn, Operation *op )
1068 {
1069         struct co_arg *arg;
1070         char *tmpdn;
1071         int status;
1072         ber_tag_t tag = op->o_tag;
1073
1074         if(tag == LDAP_REQ_BIND) {
1075                 conn->c_conn_state = SLAP_C_BINDING;
1076         }
1077
1078         if ( conn->c_dn != NULL ) {
1079                 tmpdn = ch_strdup( conn->c_dn );
1080         } else {
1081                 tmpdn = NULL;
1082         }
1083
1084         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1085         arg->co_conn = conn;
1086         arg->co_op = op;
1087
1088         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1089         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1090         (void) dn_normalize( arg->co_op->o_ndn );
1091
1092         arg->co_op->o_protocol = conn->c_protocol;
1093         arg->co_op->o_connid = conn->c_connid;
1094
1095         arg->co_op->o_authtype = conn->c_authtype;
1096         arg->co_op->o_authmech = conn->c_authmech != NULL
1097                 ?  ch_strdup( conn->c_authmech ) : NULL;
1098
1099         slap_op_add( &conn->c_ops, arg->co_op );
1100
1101         if( tmpdn != NULL ) {
1102                 free( tmpdn );
1103         }
1104
1105         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1106         active_threads++;
1107         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1108
1109         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
1110                                          connection_operation, (void *) arg );
1111
1112         if ( status != 0 ) {
1113                 Debug( LDAP_DEBUG_ANY,
1114                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1115
1116                 /* should move op to pending list */
1117         }
1118
1119         return status;
1120 }
1121
1122 int connection_write(ber_socket_t s)
1123 {
1124         Connection *c;
1125         assert( connections != NULL );
1126
1127         ldap_pvt_thread_mutex_lock( &connections_mutex );
1128
1129         c = connection_get( s );
1130
1131         slapd_clr_write( s, 0);
1132
1133         if( c == NULL ) {
1134                 Debug( LDAP_DEBUG_ANY,
1135                         "connection_write(%ld): no connection!\n",
1136                         (long) s, 0, 0 );
1137                 slapd_remove(s, 0);
1138                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1139                 return -1;
1140         }
1141
1142         c->c_n_write++;
1143
1144         Debug( LDAP_DEBUG_TRACE,
1145                 "connection_write(%d): waking output for id=%ld\n",
1146                 s, c->c_connid, 0 );
1147
1148         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1149
1150         if ( ber_pvt_sb_needs_read( c->c_sb ) )
1151                 slapd_set_read( s, 1 );
1152         if ( ber_pvt_sb_needs_write( c->c_sb ) )
1153                 slapd_set_write( s, 1 );
1154         connection_return( c );
1155         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1156         return 0;
1157 }