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_dn = NULL;
 357         c->c_cdn = NULL;
 358
 359                 c->c_listener_url = NULL;
 360                 c->c_peer_domain = NULL;
 361         c->c_peer_name = NULL;
 362         c->c_sock_name = NULL;
 363
 364         c->c_ops = NULL;
 365         c->c_pending_ops = NULL;
 366                 c->c_authmech = NULL;
 367                 c->c_authstate = NULL;
 368
 369 #ifdef HAVE_CYRUS_SASL
 370                 c->c_sasl_context = NULL;
 371 #endif /* HAVE_CYRUS_SASL */
 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_dn == NULL );
 388     assert(     c->c_cdn == NULL );
 389     assert( c->c_listener_url == NULL );
 390     assert( c->c_peer_domain == NULL );
 391     assert( c->c_peer_name == NULL );
 392     assert( c->c_sock_name == NULL );
 393     assert( c->c_ops == NULL );
 394     assert( c->c_pending_ops == NULL );
 395         assert( c->c_authmech == NULL );
 396         assert( c->c_authstate == NULL );
 397 #ifdef HAVE_CYRUS_SASL
 398         assert( c->c_sasl_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_dn != NULL) {
 472         free(c->c_dn);
 473         c->c_dn = NULL;
 474     }
 475         if(c->c_cdn != NULL) {
 476                 free(c->c_cdn);
 477                 c->c_cdn = NULL;
 478         }
 479         if(c->c_listener_url != NULL) {
 480                 free(c->c_listener_url);
 481                 c->c_listener_url = NULL;
 482         }
 483         if(c->c_peer_domain != NULL) {
 484                 free(c->c_peer_domain);
 485                 c->c_peer_domain = NULL;
 486         }
 487         if(c->c_peer_name != NULL) {
 488 #ifdef LDAP_PF_LOCAL
 489                 /*
 490                  * If peer was a domain socket, unlink. Mind you,
 491                  * they may be un-named. Should we leave this to
 492                  * the client?
 493                  */
 494                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 495                         char *path = c->c_peer_name + 5;
 496                         if (path != '\0') {
 497                                 (void)unlink(path);
 498                         }
 499                 }
 500 #endif /* LDAP_PF_LOCAL */
 501                 free(c->c_peer_name);
 502                 c->c_peer_name = NULL;
 503         }
 504         if(c->c_sock_name != NULL) {
 505                 free(c->c_sock_name);
 506                 c->c_sock_name = NULL;
 507         }
 508         if(c->c_authmech != NULL ) {
 509                 free(c->c_authmech);
 510                 c->c_authmech = NULL;
 511         }
 512         if(c->c_authstate != NULL ) {
 513                 free(c->c_authstate);
 514                 c->c_authstate = NULL;
 515         }
 516
 517 #ifdef HAVE_CYRUS_SASL
 518         if(c->c_sasl_context != NULL ) {
 519                 sasl_dispose( &c->c_sasl_context );
 520                 c->c_sasl_context = NULL;
 521         }
 522 #endif /* HAVE_CYRUS_SASL */
 523
 524         c->c_bind_in_progress = 0;
 525
 526         if ( c->c_currentber != NULL ) {
 527                 ber_free( c->c_currentber, 1 );
 528                 c->c_currentber = NULL;
 529         }
 530
 531         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 532                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 533
 534                 slapd_remove( sd, 0 );
 535                 ber_pvt_sb_close( c->c_sb );
 536
 537                 Statslog( LDAP_DEBUG_STATS,
 538                     "conn=%ld fd=%d closed\n",
 539                         c->c_connid, sd, 0, 0, 0 );
 540         }
 541
 542         ber_pvt_sb_destroy( c->c_sb );
 543
 544     c->c_conn_state = SLAP_C_INVALID;
 545     c->c_struct_state = SLAP_C_UNUSED;
 546 }
 547
 548 int connection_state_closing( Connection *c )
 549 {
 550         /* c_mutex must be locked by caller */
 551
 552         int state;
 553         assert( c != NULL );
 554         assert( c->c_struct_state == SLAP_C_USED );
 555
 556         state = c->c_conn_state;
 557
 558         assert( state != SLAP_C_INVALID );
 559
 560         return state == SLAP_C_CLOSING;
 561 }
 562
 563 static void connection_abandon( Connection *c )
 564 {
 565         /* c_mutex must be locked by caller */
 566
 567         Operation *o;
 568
 569         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 570                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 571                 o->o_abandon = 1;
 572                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 573         }
 574
 575         /* remove pending operations */
 576         for( o = slap_op_pop( &c->c_pending_ops );
 577                 o != NULL;
 578                 o = slap_op_pop( &c->c_pending_ops ) )
 579         {
 580                 slap_op_free( o );
 581         }
 582 }
 583
 584 void connection_closing( Connection *c )
 585 {
 586         assert( connections != NULL );
 587         assert( c != NULL );
 588         assert( c->c_struct_state == SLAP_C_USED );
 589         assert( c->c_conn_state != SLAP_C_INVALID );
 590
 591         /* c_mutex must be locked by caller */
 592
 593         if( c->c_conn_state != SLAP_C_CLOSING ) {
 594
 595                 Debug( LDAP_DEBUG_TRACE,
 596                         "connection_closing: readying conn=%ld sd=%d for close\n",
 597                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 598
 599                 /* update state to closing */
 600                 c->c_conn_state = SLAP_C_CLOSING;
 601
 602                 /* don't listen on this port anymore */
 603                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 604
 605                 /* shutdown I/O -- not yet implemented */
 606
 607                 /* abandon active operations */
 608                 connection_abandon( c );
 609
 610                 /* wake write blocked operations */
 611                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 612                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 613         }
 614 }
 615
 616 static void connection_close( Connection *c )
 617 {
 618         assert( connections != NULL );
 619         assert( c != NULL );
 620         assert( c->c_struct_state == SLAP_C_USED );
 621         assert( c->c_conn_state == SLAP_C_CLOSING );
 622
 623         /* note: connections_mutex and c_mutex should be locked by caller */
 624
 625         if( c->c_ops != NULL ) {
 626                 Debug( LDAP_DEBUG_TRACE,
 627                         "connection_close: deferring conn=%ld sd=%d\n",
 628                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 629
 630                 return;
 631         }
 632
 633         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 634                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 635
 636         connection_destroy( c );
 637 }
 638
 639 unsigned long connections_nextid(void)
 640 {
 641         unsigned long id;
 642         assert( connections != NULL );
 643
 644         ldap_pvt_thread_mutex_lock( &connections_mutex );
 645
 646         id = conn_nextid;
 647
 648         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 649
 650         return id;
 651 }
 652
 653 Connection* connection_first( ber_socket_t *index )
 654 {
 655         assert( connections != NULL );
 656         assert( index != NULL );
 657
 658         ldap_pvt_thread_mutex_lock( &connections_mutex );
 659
 660         *index = 0;
 661
 662         return connection_next(NULL, index);
 663 }
 664
 665 Connection* connection_next( Connection *c, ber_socket_t *index )
 666 {
 667         assert( connections != NULL );
 668         assert( index != NULL );
 669         assert( *index <= dtblsize );
 670
 671         if( c != NULL ) {
 672                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 673         }
 674
 675         c = NULL;
 676
 677         for(; *index < dtblsize; (*index)++) {
 678                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 679                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 680 #ifndef HAVE_WINSOCK
 681                         continue;
 682 #else
 683                         break;
 684 #endif
 685                 }
 686
 687                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 688                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 689                         c = &connections[(*index)++];
 690                         break;
 691                 }
 692
 693                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 694                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 695         }
 696
 697         if( c != NULL ) {
 698                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 699         }
 700
 701         return c;
 702 }
 703
 704 void connection_done( Connection *c )
 705 {
 706         assert( connections != NULL );
 707
 708         if( c != NULL ) {
 709                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 710         }
 711
 712         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 713 }
 714
 715 /*
 716  * connection_activity - handle the request operation op on connection
 717  * conn.  This routine figures out what kind of operation it is and
 718  * calls the appropriate stub to handle it.
 719  */
 720
 721 static void *
 722 connection_operation( void *arg_v )
 723 {
 724         int rc;
 725         struct co_arg   *arg = arg_v;
 726         ber_tag_t tag = arg->co_op->o_tag;
 727         Connection *conn = arg->co_conn;
 728
 729         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 730         num_ops_initiated++;
 731         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 732
 733         if( conn->c_bind_in_progress == 1 && tag != LDAP_REQ_BIND ) {
 734                 Debug( LDAP_DEBUG_ANY,
 735                         "connection_operation: SASL bind in progress.\n",
 736                         0, 0, 0 );
 737                 send_ldap_result( conn, arg->co_op, LDAP_OPERATIONS_ERROR,
 738                         NULL, "SASL bind in progress", NULL, NULL );
 739                 rc = LDAP_OPERATIONS_ERROR;
 740                 goto operations_error;
 741         }
 742
 743         switch ( tag ) {
 744         case LDAP_REQ_BIND:
 745                 rc = do_bind( conn, arg->co_op );
 746                 break;
 747
 748         case LDAP_REQ_UNBIND:
 749                 rc = do_unbind( conn, arg->co_op );
 750                 break;
 751
 752         case LDAP_REQ_ADD:
 753                 rc = do_add( conn, arg->co_op );
 754                 break;
 755
 756         case LDAP_REQ_DELETE:
 757                 rc = do_delete( conn, arg->co_op );
 758                 break;
 759
 760         case LDAP_REQ_MODRDN:
 761                 rc = do_modrdn( conn, arg->co_op );
 762                 break;
 763
 764         case LDAP_REQ_MODIFY:
 765                 rc = do_modify( conn, arg->co_op );
 766                 break;
 767
 768         case LDAP_REQ_COMPARE:
 769                 rc = do_compare( conn, arg->co_op );
 770                 break;
 771
 772         case LDAP_REQ_SEARCH:
 773                 rc = do_search( conn, arg->co_op );
 774                 break;
 775
 776         case LDAP_REQ_ABANDON:
 777                 rc = do_abandon( conn, arg->co_op );
 778                 break;
 779
 780         case LDAP_REQ_EXTENDED:
 781                 rc = do_extended( conn, arg->co_op );
 782                 break;
 783
 784         default:
 785                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 786                     tag, 0, 0 );
 787                 arg->co_op->o_tag = LBER_ERROR;
 788                 send_ldap_disconnect( conn, arg->co_op,
 789                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 790                 rc = -1;
 791                 break;
 792         }
 793
 794         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 795
 796 operations_error:
 797         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 798         num_ops_completed++;
 799         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 800
 801         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 802
 803         conn->c_n_ops_executing--;
 804         conn->c_n_ops_completed++;
 805
 806         slap_op_remove( &conn->c_ops, arg->co_op );
 807         slap_op_free( arg->co_op );
 808         arg->co_op = NULL;
 809         arg->co_conn = NULL;
 810         free( (char *) arg );
 811         arg = NULL;
 812
 813         switch( tag ) {
 814         case LBER_ERROR:
 815         case LDAP_REQ_UNBIND:
 816                 /* c_mutex is locked */
 817                 connection_closing( conn );
 818                 break;
 819
 820         case LDAP_REQ_BIND:
 821                 if( conn->c_conn_state == SLAP_C_BINDING) {
 822                         conn->c_conn_state = SLAP_C_ACTIVE;
 823                 }
 824                 /*
 825                  * Is this ever the case? For now, rely on
 826                  * the backend to set this.
 827                  */
 828                 if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 829                         conn->c_bind_in_progress = 1;
 830                 }
 831         }
 832
 833         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 834         active_threads--;
 835         if( active_threads < 1 ) {
 836                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 837         }
 838         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 839
 840         connection_resched( conn );
 841
 842         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 843
 844         return NULL;
 845 }
 846
 847 int connection_read(ber_socket_t s)
 848 {
 849         int rc = 0;
 850         Connection *c;
 851         assert( connections != NULL );
 852
 853         ldap_pvt_thread_mutex_lock( &connections_mutex );
 854
 855         /* get (locked) connection */
 856         c = connection_get( s );
 857
 858         if( c == NULL ) {
 859                 Debug( LDAP_DEBUG_ANY,
 860                         "connection_read(%ld): no connection!\n",
 861                         (long) s, 0, 0 );
 862
 863                 slapd_remove(s, 0);
 864
 865                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 866                 return -1;
 867         }
 868
 869         c->c_n_read++;
 870
 871         if( c->c_conn_state == SLAP_C_CLOSING ) {
 872                 Debug( LDAP_DEBUG_TRACE,
 873                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 874                         s, c->c_connid, 0 );
 875
 876                 connection_return( c );
 877                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 878                 return 0;
 879         }
 880
 881         Debug( LDAP_DEBUG_TRACE,
 882                 "connection_read(%d): checking for input on id=%ld\n",
 883                 s, c->c_connid, 0 );
 884
 885 #ifdef HAVE_TLS
 886         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 887                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 888                 if ( rc < 0 ) {
 889                         Debug( LDAP_DEBUG_TRACE,
 890                                "connection_read(%d): TLS accept error error=%d id=%ld, closing\n",
 891                                s, rc, c->c_connid );
 892
 893                         c->c_needs_tls_accept = 0;
 894                         /* connections_mutex and c_mutex are locked */
 895                         connection_closing( c );
 896                         connection_close( c );
 897                 } else if ( rc == 0 ) {
 898                         c->c_needs_tls_accept = 0;
 899                 }
 900                 connection_return( c );
 901                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 902                 return 0;
 903         }
 904 #endif
 905
 906 #define CONNECTION_INPUT_LOOP 1
 907
 908 #ifdef DATA_READY_LOOP
 909         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 910 #elif CONNECTION_INPUT_LOOP
 911         while(!rc)
 912 #endif
 913         {
 914                 /* How do we do this without getting into a busy loop ? */
 915                 rc = connection_input( c );
 916         }
 917
 918         if( rc < 0 ) {
 919                 Debug( LDAP_DEBUG_TRACE,
 920                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 921                         s, rc, c->c_connid );
 922
 923                 /* connections_mutex and c_mutex are locked */
 924                 connection_closing( c );
 925                 connection_close( c );
 926         }
 927
 928         if ( ber_pvt_sb_needs_read( c->c_sb ) )
 929                 slapd_set_read( s, 1 );
 930         if ( ber_pvt_sb_needs_write( c->c_sb ) )
 931                 slapd_set_write( s, 1 );
 932         connection_return( c );
 933         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 934         return 0;
 935 }
 936
 937 static int
 938 connection_input(
 939     Connection *conn
 940 )
 941 {
 942         Operation *op;
 943         ber_tag_t       tag;
 944         ber_len_t       len;
 945         ber_int_t       msgid;
 946         BerElement      *ber;
 947
 948         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 949             == NULL ) {
 950                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 951                 return -1;
 952         }
 953
 954         errno = 0;
 955         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 956             != LDAP_TAG_MESSAGE )
 957         {
 958                 int err = errno;
 959
 960                 Debug( LDAP_DEBUG_TRACE,
 961                         "ber_get_next on fd %d failed errno=%d (%s)\n",
 962                         ber_pvt_sb_get_desc( conn->c_sb ), err, STRERROR(err) );
 963                 Debug( LDAP_DEBUG_TRACE,
 964                         "\t*** got %ld of %lu so far\n",
 965                         (long) ( conn->c_currentber->ber_buf
 966                                 ?  conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf
 967                                 : 0 ),
 968                         (long) conn->c_currentber->ber_len, 0 );
 969
 970                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 971                         /* log, close and send error */
 972                         ber_free( conn->c_currentber, 1 );
 973                         conn->c_currentber = NULL;
 974
 975                         return -2;
 976                 }
 977                 return 1;
 978         }
 979
 980         ber = conn->c_currentber;
 981         conn->c_currentber = NULL;
 982
 983         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 984                 /* log, close and send error */
 985                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 986                     0 );
 987                 ber_free( ber, 1 );
 988                 return -1;
 989         }
 990
 991         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 992                 /* log, close and send error */
 993                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 994                     0 );
 995                 ber_free( ber, 1 );
 996
 997                 return -1;
 998         }
 999
1000         if(tag == LDAP_REQ_BIND) {
1001                 /* immediately abandon all exiting operations upon BIND */
1002                 connection_abandon( conn );
1003         }
1004
1005         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1006
1007         if ( conn->c_conn_state == SLAP_C_BINDING
1008                 || conn->c_conn_state == SLAP_C_CLOSING )
1009         {
1010                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1011                 conn->c_n_ops_pending++;
1012                 slap_op_add( &conn->c_pending_ops, op );
1013
1014         } else {
1015                 conn->c_n_ops_executing++;
1016                 connection_op_activate( conn, op );
1017         }
1018
1019 #ifdef NO_THREADS
1020         if ( conn->c_struct_state != SLAP_C_USED ) {
1021                 /* connection must have got closed underneath us */
1022                 return 1;
1023         }
1024 #endif
1025         assert( conn->c_struct_state == SLAP_C_USED );
1026
1027         return 0;
1028 }
1029
1030 static int
1031 connection_resched( Connection *conn )
1032 {
1033         Operation *op;
1034
1035         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1036                 Debug( LDAP_DEBUG_TRACE,
1037                         "connection_resched: attempting closing conn=%ld sd=%d\n",
1038                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
1039
1040                 connection_close( conn );
1041                 return 0;
1042         }
1043
1044         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1045                 /* other states need different handling */
1046                 return 0;
1047         }
1048
1049         for( op = slap_op_pop( &conn->c_pending_ops );
1050                 op != NULL;
1051                 op = slap_op_pop( &conn->c_pending_ops ) )
1052         {
1053                 /* pending operations should not be marked for abandonment */
1054                 assert(!op->o_abandon);
1055
1056                 conn->c_n_ops_pending--;
1057                 conn->c_n_ops_executing++;
1058
1059                 connection_op_activate( conn, op );
1060
1061                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1062                         break;
1063                 }
1064         }
1065         return 0;
1066 }
1067
1068 static int connection_op_activate( Connection *conn, Operation *op )
1069 {
1070         struct co_arg *arg;
1071         char *tmpdn;
1072         int status;
1073         ber_tag_t tag = op->o_tag;
1074
1075         if(tag == LDAP_REQ_BIND) {
1076                 conn->c_conn_state = SLAP_C_BINDING;
1077         }
1078
1079         if ( conn->c_dn != NULL ) {
1080                 tmpdn = ch_strdup( conn->c_dn );
1081         } else {
1082                 tmpdn = NULL;
1083         }
1084
1085         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1086         arg->co_conn = conn;
1087         arg->co_op = op;
1088
1089         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1090         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1091         (void) dn_normalize( arg->co_op->o_ndn );
1092
1093         arg->co_op->o_protocol = conn->c_protocol;
1094         arg->co_op->o_connid = conn->c_connid;
1095
1096         arg->co_op->o_authtype = conn->c_authtype;
1097         arg->co_op->o_authmech = conn->c_authmech != NULL
1098                 ?  ch_strdup( conn->c_authmech ) : NULL;
1099
1100         slap_op_add( &conn->c_ops, arg->co_op );
1101
1102         if( tmpdn != NULL ) {
1103                 free( tmpdn );
1104         }
1105
1106         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1107         active_threads++;
1108         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1109
1110         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
1111                                          connection_operation, (void *) arg );
1112
1113         if ( status != 0 ) {
1114                 Debug( LDAP_DEBUG_ANY,
1115                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1116
1117                 /* should move op to pending list */
1118         }
1119
1120         return status;
1121 }
1122
1123 int connection_write(ber_socket_t s)
1124 {
1125         Connection *c;
1126         assert( connections != NULL );
1127
1128         ldap_pvt_thread_mutex_lock( &connections_mutex );
1129
1130         c = connection_get( s );
1131
1132         slapd_clr_write( s, 0);
1133
1134         if( c == NULL ) {
1135                 Debug( LDAP_DEBUG_ANY,
1136                         "connection_write(%ld): no connection!\n",
1137                         (long) s, 0, 0 );
1138                 slapd_remove(s, 0);
1139                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1140                 return -1;
1141         }
1142
1143         c->c_n_write++;
1144
1145         Debug( LDAP_DEBUG_TRACE,
1146                 "connection_write(%d): waking output for id=%ld\n",
1147                 s, c->c_connid, 0 );
1148
1149         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1150
1151         if ( ber_pvt_sb_needs_read( c->c_sb ) )
1152                 slapd_set_read( s, 1 );
1153         if ( ber_pvt_sb_needs_write( c->c_sb ) )
1154                 slapd_set_write( s, 1 );
1155         connection_return( c );
1156         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1157         return 0;
1158 }