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         switch ( tag ) {
 734         case LDAP_REQ_BIND:
 735                 rc = do_bind( conn, arg->co_op );
 736                 break;
 737
 738         case LDAP_REQ_UNBIND:
 739                 rc = do_unbind( conn, arg->co_op );
 740                 break;
 741
 742         case LDAP_REQ_ADD:
 743                 rc = do_add( conn, arg->co_op );
 744                 break;
 745
 746         case LDAP_REQ_DELETE:
 747                 rc = do_delete( conn, arg->co_op );
 748                 break;
 749
 750         case LDAP_REQ_MODRDN:
 751                 rc = do_modrdn( conn, arg->co_op );
 752                 break;
 753
 754         case LDAP_REQ_MODIFY:
 755                 rc = do_modify( conn, arg->co_op );
 756                 break;
 757
 758         case LDAP_REQ_COMPARE:
 759                 rc = do_compare( conn, arg->co_op );
 760                 break;
 761
 762         case LDAP_REQ_SEARCH:
 763                 rc = do_search( conn, arg->co_op );
 764                 break;
 765
 766         case LDAP_REQ_ABANDON:
 767                 rc = do_abandon( conn, arg->co_op );
 768                 break;
 769
 770         case LDAP_REQ_EXTENDED:
 771                 rc = do_extended( conn, arg->co_op );
 772                 break;
 773
 774         default:
 775                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 776                     tag, 0, 0 );
 777                 arg->co_op->o_tag = LBER_ERROR;
 778                 send_ldap_disconnect( conn, arg->co_op,
 779                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 780                 rc = -1;
 781                 break;
 782         }
 783
 784         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 785
 786         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 787         num_ops_completed++;
 788         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 789
 790         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 791
 792         conn->c_n_ops_executing--;
 793         conn->c_n_ops_completed++;
 794
 795         slap_op_remove( &conn->c_ops, arg->co_op );
 796         slap_op_free( arg->co_op );
 797         arg->co_op = NULL;
 798         arg->co_conn = NULL;
 799         free( (char *) arg );
 800         arg = NULL;
 801
 802         switch( tag ) {
 803         case LBER_ERROR:
 804         case LDAP_REQ_UNBIND:
 805                 /* c_mutex is locked */
 806                 connection_closing( conn );
 807                 break;
 808
 809         case LDAP_REQ_BIND:
 810                 if( conn->c_conn_state == SLAP_C_BINDING) {
 811                         conn->c_conn_state = SLAP_C_ACTIVE;
 812                 }
 813                 /*
 814                  * Is this ever the case? For now, rely on
 815                  * the backend to set this.
 816                  */
 817                 if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 818                         conn->c_bind_in_progress = 1;
 819                 }
 820         }
 821
 822         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 823         active_threads--;
 824         if( active_threads < 1 ) {
 825                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 826         }
 827         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 828
 829         connection_resched( conn );
 830
 831         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 832
 833         return NULL;
 834 }
 835
 836 int connection_read(ber_socket_t s)
 837 {
 838         int rc = 0;
 839         Connection *c;
 840         assert( connections != NULL );
 841
 842         ldap_pvt_thread_mutex_lock( &connections_mutex );
 843
 844         /* get (locked) connection */
 845         c = connection_get( s );
 846
 847         if( c == NULL ) {
 848                 Debug( LDAP_DEBUG_ANY,
 849                         "connection_read(%ld): no connection!\n",
 850                         (long) s, 0, 0 );
 851
 852                 slapd_remove(s, 0);
 853
 854                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 855                 return -1;
 856         }
 857
 858         c->c_n_read++;
 859
 860         if( c->c_conn_state == SLAP_C_CLOSING ) {
 861                 Debug( LDAP_DEBUG_TRACE,
 862                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 863                         s, c->c_connid, 0 );
 864
 865                 connection_return( c );
 866                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 867                 return 0;
 868         }
 869
 870         Debug( LDAP_DEBUG_TRACE,
 871                 "connection_read(%d): checking for input on id=%ld\n",
 872                 s, c->c_connid, 0 );
 873
 874 #ifdef HAVE_TLS
 875         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 876                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 877                 if ( rc < 0 ) {
 878                         Debug( LDAP_DEBUG_TRACE,
 879                                "connection_read(%d): TLS accept error error=%d id=%ld, closing\n",
 880                                s, rc, c->c_connid );
 881
 882                         c->c_needs_tls_accept = 0;
 883                         /* connections_mutex and c_mutex are locked */
 884                         connection_closing( c );
 885                         connection_close( c );
 886                 } else if ( rc == 0 ) {
 887                         c->c_needs_tls_accept = 0;
 888                 }
 889                 connection_return( c );
 890                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 891                 return 0;
 892         }
 893 #endif
 894
 895 #define CONNECTION_INPUT_LOOP 1
 896
 897 #ifdef DATA_READY_LOOP
 898         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 899 #elif CONNECTION_INPUT_LOOP
 900         while(!rc)
 901 #endif
 902         {
 903                 /* How do we do this without getting into a busy loop ? */
 904                 rc = connection_input( c );
 905         }
 906
 907         if( rc < 0 ) {
 908                 Debug( LDAP_DEBUG_TRACE,
 909                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 910                         s, rc, c->c_connid );
 911
 912                 /* connections_mutex and c_mutex are locked */
 913                 connection_closing( c );
 914                 connection_close( c );
 915         }
 916
 917         if ( ber_pvt_sb_needs_read( c->c_sb ) )
 918                 slapd_set_read( s, 1 );
 919         if ( ber_pvt_sb_needs_write( c->c_sb ) )
 920                 slapd_set_write( s, 1 );
 921         connection_return( c );
 922         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 923         return 0;
 924 }
 925
 926 static int
 927 connection_input(
 928     Connection *conn
 929 )
 930 {
 931         Operation *op;
 932         ber_tag_t       tag;
 933         ber_len_t       len;
 934         ber_int_t       msgid;
 935         BerElement      *ber;
 936
 937         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 938             == NULL ) {
 939                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 940                 return -1;
 941         }
 942
 943         errno = 0;
 944         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 945             != LDAP_TAG_MESSAGE )
 946         {
 947                 int err = errno;
 948
 949                 Debug( LDAP_DEBUG_TRACE,
 950                         "ber_get_next on fd %d failed errno=%d (%s)\n",
 951                         ber_pvt_sb_get_desc( conn->c_sb ), err, STRERROR(err) );
 952                 Debug( LDAP_DEBUG_TRACE,
 953                         "\t*** got %ld of %lu so far\n",
 954                         (long) ( conn->c_currentber->ber_buf
 955                                 ?  conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf
 956                                 : 0 ),
 957                         (long) conn->c_currentber->ber_len, 0 );
 958
 959                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 960                         /* log, close and send error */
 961                         ber_free( conn->c_currentber, 1 );
 962                         conn->c_currentber = NULL;
 963
 964                         return -2;
 965                 }
 966                 return 1;
 967         }
 968
 969         ber = conn->c_currentber;
 970         conn->c_currentber = NULL;
 971
 972         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 973                 /* log, close and send error */
 974                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 975                     0 );
 976                 ber_free( ber, 1 );
 977                 return -1;
 978         }
 979
 980         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 981                 /* log, close and send error */
 982                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 983                     0 );
 984                 ber_free( ber, 1 );
 985
 986                 return -1;
 987         }
 988
 989         if(tag == LDAP_REQ_BIND) {
 990                 /* immediately abandon all exiting operations upon BIND */
 991                 connection_abandon( conn );
 992         }
 993
 994         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 995
 996         if ( conn->c_conn_state == SLAP_C_BINDING
 997                 || conn->c_conn_state == SLAP_C_CLOSING )
 998         {
 999                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1000                 conn->c_n_ops_pending++;
1001                 slap_op_add( &conn->c_pending_ops, op );
1002
1003         } else {
1004                 conn->c_n_ops_executing++;
1005                 connection_op_activate( conn, op );
1006         }
1007
1008 #ifdef NO_THREADS
1009         if ( conn->c_struct_state != SLAP_C_USED ) {
1010                 /* connection must have got closed underneath us */
1011                 return 1;
1012         }
1013 #endif
1014         assert( conn->c_struct_state == SLAP_C_USED );
1015
1016         return 0;
1017 }
1018
1019 static int
1020 connection_resched( Connection *conn )
1021 {
1022         Operation *op;
1023
1024         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1025                 Debug( LDAP_DEBUG_TRACE,
1026                         "connection_resched: attempting closing conn=%ld sd=%d\n",
1027                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
1028
1029                 connection_close( conn );
1030                 return 0;
1031         }
1032
1033         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1034                 /* other states need different handling */
1035                 return 0;
1036         }
1037
1038         for( op = slap_op_pop( &conn->c_pending_ops );
1039                 op != NULL;
1040                 op = slap_op_pop( &conn->c_pending_ops ) )
1041         {
1042                 /* pending operations should not be marked for abandonment */
1043                 assert(!op->o_abandon);
1044
1045                 conn->c_n_ops_pending--;
1046                 conn->c_n_ops_executing++;
1047
1048                 connection_op_activate( conn, op );
1049
1050                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1051                         break;
1052                 }
1053         }
1054         return 0;
1055 }
1056
1057 static int connection_op_activate( Connection *conn, Operation *op )
1058 {
1059         struct co_arg *arg;
1060         char *tmpdn;
1061         int status;
1062         ber_tag_t tag = op->o_tag;
1063
1064         if(tag == LDAP_REQ_BIND) {
1065                 conn->c_conn_state = SLAP_C_BINDING;
1066         }
1067
1068         if ( conn->c_dn != NULL ) {
1069                 tmpdn = ch_strdup( conn->c_dn );
1070         } else {
1071                 tmpdn = NULL;
1072         }
1073
1074         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1075         arg->co_conn = conn;
1076         arg->co_op = op;
1077
1078         arg->co_op->o_bind_in_progress = conn->c_bind_in_progress;
1079
1080         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1081         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1082         (void) dn_normalize( arg->co_op->o_ndn );
1083
1084         arg->co_op->o_protocol = conn->c_protocol;
1085         arg->co_op->o_connid = conn->c_connid;
1086
1087         arg->co_op->o_authtype = conn->c_authtype;
1088         arg->co_op->o_authmech = conn->c_authmech != NULL
1089                 ?  ch_strdup( conn->c_authmech ) : NULL;
1090
1091         slap_op_add( &conn->c_ops, arg->co_op );
1092
1093         if( tmpdn != NULL ) {
1094                 free( tmpdn );
1095         }
1096
1097         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1098         active_threads++;
1099         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1100
1101         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
1102                                          connection_operation, (void *) arg );
1103
1104         if ( status != 0 ) {
1105                 Debug( LDAP_DEBUG_ANY,
1106                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1107
1108                 /* should move op to pending list */
1109         }
1110
1111         return status;
1112 }
1113
1114 int connection_write(ber_socket_t s)
1115 {
1116         Connection *c;
1117         assert( connections != NULL );
1118
1119         ldap_pvt_thread_mutex_lock( &connections_mutex );
1120
1121         c = connection_get( s );
1122
1123         slapd_clr_write( s, 0);
1124
1125         if( c == NULL ) {
1126                 Debug( LDAP_DEBUG_ANY,
1127                         "connection_write(%ld): no connection!\n",
1128                         (long) s, 0, 0 );
1129                 slapd_remove(s, 0);
1130                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1131                 return -1;
1132         }
1133
1134         c->c_n_write++;
1135
1136         Debug( LDAP_DEBUG_TRACE,
1137                 "connection_write(%d): waking output for id=%ld\n",
1138                 s, c->c_connid, 0 );
1139
1140         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1141
1142         if ( ber_pvt_sb_needs_read( c->c_sb ) )
1143                 slapd_set_read( s, 1 );
1144         if ( ber_pvt_sb_needs_write( c->c_sb ) )
1145                 slapd_set_write( s, 1 );
1146         connection_return( c );
1147         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1148         return 0;
1149 }