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

   1 #include "portable.h"
   2
   3 #include <stdio.h>
   4
   5 #include <ac/errno.h>
   6 #include <ac/signal.h>
   7 #include <ac/socket.h>
   8 #include <ac/string.h>
   9 #include <ac/time.h>
  10
  11 #include "slap.h"
  12
  13 #ifdef HAVE_WINSOCK
  14 #define EWOULDBLOCK WSAEWOULDBLOCK
  15 #endif
  16
  17 /* protected by connections_mutex */
  18 static ldap_pvt_thread_mutex_t connections_mutex;
  19 static Connection *connections = NULL;
  20 static int conn_index = -1;
  21 static long conn_nextid = 0;
  22
  23 /* structure state (protected by connections_mutex) */
  24 #define SLAP_C_UNINITIALIZED    0x0     /* MUST BE ZERO (0) */
  25 #define SLAP_C_UNUSED                   0x1
  26 #define SLAP_C_USED                             0x2
  27
  28 /* connection state (protected by c_mutex ) */
  29 #define SLAP_C_INVALID                  0x0     /* MUST BE ZERO (0) */
  30 #define SLAP_C_INACTIVE                 0x1     /* zero threads */
  31 #define SLAP_C_ACTIVE                   0x2 /* one or more threads */
  32 #define SLAP_C_BINDING                  0x3     /* binding */
  33 #define SLAP_C_CLOSING                  0x4     /* closing */
  34
  35 void slapd_remove(int s);
  36 static Connection* connection_get( int s );
  37
  38 static int connection_input( Connection *c );
  39
  40 static int connection_op_activate( Connection *conn, Operation *op );
  41 static int connection_resched( Connection *conn );
  42
  43 struct co_arg {
  44         Connection      *co_conn;
  45         Operation       *co_op;
  46 };
  47
  48 /*
  49  * Initialize connection management infrastructure.
  50  */
  51 int connections_init(void)
  52 {
  53         int i;
  54
  55         assert( connections == NULL );
  56
  57         if( connections != NULL) { /* probably should assert this */
  58                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  59                         0, 0, 0 );
  60                 return -1;
  61         }
  62
  63         /* should check return of every call */
  64         ldap_pvt_thread_mutex_init( &connections_mutex );
  65
  66         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  67
  68         if( connections == NULL ) {
  69                 Debug( LDAP_DEBUG_ANY,
  70                         "connections_init: allocation (%d*%ld) of connection array failed.\n",
  71                         dtblsize, (long) sizeof(Connection), 0 );
  72                 return -1;
  73         }
  74
  75         for ( i = 0; i < dtblsize; i++ )
  76                 memset( &connections[i], 0, sizeof(Connection) );
  77
  78         /*
  79          * per entry initialization of the Connection array initialization
  80          * will be done by connection_init()
  81          */
  82
  83         return 0;
  84 }
  85
  86 static Connection* connection_get( int s )
  87 {
  88         Connection *c = NULL;
  89
  90         assert( connections != NULL );
  91
  92         if(s < 0) {
  93                 return NULL;
  94         }
  95
  96 #ifndef HAVE_WINSOCK
  97         assert( connections[s].c_struct_state == SLAP_C_USED );
  98         assert( connections[s].c_conn_state != SLAP_C_INVALID );
  99         assert( connections[s].c_sb.sb_sd != -1 );
 100
 101         c = &connections[s];
 102 #else
 103         {
 104                 int i;
 105
 106                 for(i=0; i<dtblsize; i++) {
 107                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 108                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 109                                 assert( connections[i].c_sb.sb_sd == 0 );
 110                                 break;
 111                         }
 112
 113                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 114                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 115                                 assert( connections[i].c_sb.sb_sd == -1 );
 116                                 continue;
 117                         }
 118
 119                         assert( connections[i].c_struct_state == SLAP_C_USED );
 120                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 121                         assert( connections[i].c_sb.sb_sd != -1 );
 122
 123                         if( connections[i].c_sb.sb_sd == s ) {
 124                                 c = &connections[i];
 125                                 break;
 126                         }
 127                 }
 128         }
 129 #endif
 130
 131         if( c != NULL ) {
 132                 /* we do this BEFORE locking to aid in debugging */
 133                 Debug( LDAP_DEBUG_TRACE,
 134                         "connection_get(%d): got connid=%ld\n",
 135                         s, c->c_connid, 0 );
 136
 137                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 138         }
 139         return c;
 140 }
 141
 142 static void connection_return( Connection *c )
 143 {
 144         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 145 }
 146
 147 long connection_init(
 148         int s,
 149         const char* name,
 150         const char* addr)
 151 {
 152         long id;
 153         Connection *c;
 154         assert( connections != NULL );
 155
 156         if( s < 0 ) {
 157                 return -1;
 158         }
 159
 160         assert( s >= 0 );
 161 #ifndef HAVE_WINSOCK
 162         assert( s < dtblsize );
 163 #endif
 164
 165         ldap_pvt_thread_mutex_lock( &connections_mutex );
 166
 167 #ifndef HAVE_WINSOCK
 168         c = &connections[s];
 169
 170 #else
 171         {
 172                 int i;
 173
 174         for( i=0; i < dtblsize; i++) {
 175             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 176                 assert( connections[i].c_sb.sb_sd == 0 );
 177                 c = &connections[i];
 178                 break;
 179             }
 180
 181             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 182                 assert( connections[i].c_sb.sb_sd == -1 );
 183                 c = &connections[i];
 184                 break;
 185             }
 186
 187             assert( connections[i].c_struct_state == SLAP_C_USED );
 188             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 189             assert( connections[i].c_sb.sb_sd != -1 );
 190         }
 191
 192         if( c == NULL ) {
 193             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 194             return -1;
 195         }
 196     }
 197 #endif
 198
 199     assert( c != NULL );
 200     assert( c->c_struct_state != SLAP_C_USED );
 201     assert( c->c_conn_state == SLAP_C_INVALID );
 202
 203     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 204         c->c_dn = NULL;
 205         c->c_cdn = NULL;
 206         c->c_client_name = NULL;
 207         c->c_client_addr = NULL;
 208         c->c_ops = NULL;
 209         c->c_pending_ops = NULL;
 210
 211         lber_pvt_sb_init( &c->c_sb );
 212
 213         /* should check status of thread calls */
 214         ldap_pvt_thread_mutex_init( &c->c_mutex );
 215         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 216         ldap_pvt_thread_cond_init( &c->c_write_cv );
 217
 218         c->c_struct_state = SLAP_C_UNUSED;
 219     }
 220
 221     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 222
 223     assert( c->c_struct_state == SLAP_C_UNUSED );
 224     assert(     c->c_dn == NULL );
 225     assert(     c->c_cdn == NULL );
 226     assert( c->c_client_name == NULL );
 227     assert( c->c_client_addr == NULL );
 228     assert( c->c_ops == NULL );
 229     assert( c->c_pending_ops == NULL );
 230
 231     c->c_client_name = ch_strdup( name == NULL ? "" : name );
 232     c->c_client_addr = ch_strdup( addr );
 233
 234     c->c_n_ops_received = 0;
 235 #ifdef LDAP_COUNTERS
 236     c->c_n_ops_executing = 0;
 237     c->c_n_ops_pending = 0;
 238     c->c_n_ops_completed = 0;
 239 #endif
 240
 241     c->c_starttime = slap_get_time();
 242
 243     lber_pvt_sb_set_desc( &c->c_sb, s );
 244     lber_pvt_sb_set_io( &c->c_sb, &lber_pvt_sb_io_tcp, NULL );
 245
 246     if( lber_pvt_sb_set_nonblock( &c->c_sb, 1 ) < 0 ) {
 247         Debug( LDAP_DEBUG_ANY,
 248             "connection_init(%d, %s, %s): set nonblocking failed\n",
 249             s, c->c_client_name, c->c_client_addr);
 250     }
 251
 252     id = c->c_connid = conn_nextid++;
 253
 254     c->c_conn_state = SLAP_C_INACTIVE;
 255     c->c_struct_state = SLAP_C_USED;
 256
 257     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 258     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 259
 260     return id;
 261 }
 262
 263 static void
 264 connection_destroy( Connection *c )
 265 {
 266     assert( connections != NULL );
 267     assert( c != NULL );
 268     assert( c->c_struct_state != SLAP_C_UNUSED );
 269     assert( c->c_conn_state != SLAP_C_INVALID );
 270     assert( c->c_ops == NULL );
 271
 272     c->c_struct_state = SLAP_C_UNUSED;
 273     c->c_conn_state = SLAP_C_INVALID;
 274
 275     c->c_version = 0;
 276     c->c_protocol = 0;
 277
 278     c->c_starttime = 0;
 279
 280     if(c->c_dn != NULL) {
 281         free(c->c_dn);
 282         c->c_dn = NULL;
 283     }
 284         if(c->c_cdn != NULL) {
 285                 free(c->c_cdn);
 286                 c->c_cdn = NULL;
 287         }
 288         if(c->c_client_name != NULL) {
 289                 free(c->c_client_name);
 290                 c->c_client_name = NULL;
 291         }
 292         if(c->c_client_addr != NULL) {
 293                 free(c->c_client_addr);
 294                 c->c_client_addr = NULL;
 295         }
 296
 297         if ( lber_pvt_sb_in_use(&c->c_sb) ) {
 298                 int sd = lber_pvt_sb_get_desc(&c->c_sb);
 299
 300                 slapd_remove( sd );
 301                 lber_pvt_sb_close( &c->c_sb );
 302
 303                 Statslog( LDAP_DEBUG_STATS,
 304                     "conn=%d fd=%d closed.\n",
 305                         c->c_connid, sd, 0, 0, 0 );
 306         }
 307
 308         lber_pvt_sb_destroy( &c->c_sb );
 309 }
 310
 311 int connection_state_closing( Connection *c )
 312 {
 313         assert( c != NULL );
 314         assert( c->c_struct_state == SLAP_C_USED );
 315         assert( c->c_conn_state != SLAP_C_INVALID );
 316
 317         return c->c_conn_state == SLAP_C_CLOSING;
 318 }
 319
 320 void connection_closing( Connection *c )
 321 {
 322         assert( connections != NULL );
 323         assert( c != NULL );
 324         assert( c->c_struct_state == SLAP_C_USED );
 325         assert( c->c_conn_state != SLAP_C_INVALID );
 326
 327         if( c->c_conn_state != SLAP_C_CLOSING ) {
 328                 Operation *o;
 329
 330                 Debug( LDAP_DEBUG_TRACE,
 331                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 332                         c->c_connid, c->c_sb.sb_sd, 0 );
 333
 334                 /* don't listen on this port anymore */
 335                 slapd_clr_read( c->c_sb.sb_sd, 1 );
 336                 c->c_conn_state = SLAP_C_CLOSING;
 337
 338                 /* shutdown I/O -- not yet implemented */
 339
 340                 /* abandon active operations */
 341                 for( o = c->c_ops; o != NULL; o = o->o_next ) {
 342                         ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 343                         o->o_abandon = 1;
 344                         ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 345                 }
 346
 347                 /* remove pending operations */
 348                 for( o = slap_op_pop( &c->c_pending_ops );
 349                         o != NULL;
 350                         o = slap_op_pop( &c->c_pending_ops ) )
 351                 {
 352                         slap_op_free( o );
 353                 }
 354
 355                 /* wake write blocked operations */
 356                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 357         }
 358 }
 359
 360 static void connection_close( Connection *c )
 361 {
 362         assert( connections != NULL );
 363         assert( c != NULL );
 364         assert( c->c_struct_state == SLAP_C_USED );
 365         assert( c->c_conn_state == SLAP_C_CLOSING );
 366
 367         if( c->c_ops != NULL ) {
 368                 Debug( LDAP_DEBUG_TRACE,
 369                         "connection_close: deferring conn=%ld sd=%d.\n",
 370                         c->c_connid, c->c_sb.sb_sd, 0 );
 371
 372                 return;
 373         }
 374
 375         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 376                 c->c_connid, c->c_sb.sb_sd, 0 );
 377
 378         connection_destroy( c );
 379 }
 380
 381 long connections_nextid(void)
 382 {
 383         long id;
 384         assert( connections != NULL );
 385
 386         ldap_pvt_thread_mutex_lock( &connections_mutex );
 387
 388         id = conn_nextid;
 389
 390         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 391
 392         return id;
 393 }
 394
 395 Connection* connection_first(void)
 396 {
 397         assert( connections != NULL );
 398
 399         ldap_pvt_thread_mutex_lock( &connections_mutex );
 400
 401         assert( conn_index == -1 );
 402         conn_index = 0;
 403
 404         return connection_next(NULL);
 405 }
 406
 407 Connection* connection_next(Connection *c)
 408 {
 409         assert( connections != NULL );
 410         assert( conn_index != -1 );
 411         assert( conn_index <= dtblsize );
 412
 413         if( c != NULL ) {
 414                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 415         }
 416
 417         c = NULL;
 418
 419         for(; conn_index < dtblsize; conn_index++) {
 420                 if( connections[conn_index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 421                         assert( connections[conn_index].c_conn_state == SLAP_C_INVALID );
 422 #ifndef HAVE_WINSOCK
 423                         continue;
 424 #else
 425                         break;
 426 #endif
 427                 }
 428
 429                 if( connections[conn_index].c_struct_state == SLAP_C_USED ) {
 430                         assert( connections[conn_index].c_conn_state != SLAP_C_INVALID );
 431                         c = &connections[conn_index++];
 432                         break;
 433                 }
 434
 435                 assert( connections[conn_index].c_struct_state == SLAP_C_UNUSED );
 436                 assert( connections[conn_index].c_conn_state == SLAP_C_INVALID );
 437         }
 438
 439         if( c != NULL ) {
 440                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 441         }
 442
 443         return c;
 444 }
 445
 446 void connection_done(Connection *c)
 447 {
 448         assert( connections != NULL );
 449         assert( conn_index != -1 );
 450         assert( conn_index <= dtblsize );
 451
 452         if( c != NULL ) {
 453                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 454         }
 455
 456         conn_index = -1;
 457         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 458 }
 459
 460 /*
 461  * connection_activity - handle the request operation op on connection
 462  * conn.  This routine figures out what kind of operation it is and
 463  * calls the appropriate stub to handle it.
 464  */
 465
 466 static void *
 467 connection_operation( void *arg_v )
 468 {
 469         struct co_arg   *arg = arg_v;
 470         int tag = arg->co_op->o_tag;
 471         Connection *conn = arg->co_conn;
 472
 473 #ifdef LDAP_COUNTERS
 474         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 475         num_ops_initiated++;
 476         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 477 #endif
 478
 479         switch ( tag ) {
 480         case LDAP_REQ_BIND:
 481                 do_bind( conn, arg->co_op );
 482                 break;
 483
 484 #ifdef LDAP_COMPAT30
 485         case LDAP_REQ_UNBIND_30:
 486 #endif
 487         case LDAP_REQ_UNBIND:
 488                 do_unbind( conn, arg->co_op );
 489                 break;
 490
 491         case LDAP_REQ_ADD:
 492                 do_add( conn, arg->co_op );
 493                 break;
 494
 495 #ifdef LDAP_COMPAT30
 496         case LDAP_REQ_DELETE_30:
 497 #endif
 498         case LDAP_REQ_DELETE:
 499                 do_delete( conn, arg->co_op );
 500                 break;
 501
 502         case LDAP_REQ_MODRDN:
 503                 do_modrdn( conn, arg->co_op );
 504                 break;
 505
 506         case LDAP_REQ_MODIFY:
 507                 do_modify( conn, arg->co_op );
 508                 break;
 509
 510         case LDAP_REQ_COMPARE:
 511                 do_compare( conn, arg->co_op );
 512                 break;
 513
 514         case LDAP_REQ_SEARCH:
 515                 do_search( conn, arg->co_op );
 516                 break;
 517
 518 #ifdef LDAP_COMPAT30
 519         case LDAP_REQ_ABANDON_30:
 520 #endif
 521         case LDAP_REQ_ABANDON:
 522                 do_abandon( conn, arg->co_op );
 523                 break;
 524
 525         default:
 526                 Debug( LDAP_DEBUG_ANY, "unknown request 0x%lx\n",
 527                     arg->co_op->o_tag, 0, 0 );
 528                 break;
 529         }
 530
 531 #ifdef LDAP_COUNTERS
 532         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 533         num_ops_completed++;
 534         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 535 #endif
 536
 537         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 538
 539 #ifdef LDAP_COUNTERS
 540         conn->c_n_ops_completed++;
 541 #endif
 542
 543         slap_op_remove( &conn->c_ops, arg->co_op );
 544         slap_op_free( arg->co_op );
 545         arg->co_op = NULL;
 546         arg->co_conn = NULL;
 547         free( (char *) arg );
 548         arg = NULL;
 549
 550         switch( tag ) {
 551 #ifdef LDAP_COMPAT30
 552         case LDAP_REQ_UNBIND_30:
 553 #endif
 554         case LDAP_REQ_UNBIND:
 555                 connection_closing( conn );
 556                 break;
 557
 558         case LDAP_REQ_BIND:
 559                 if( conn->c_conn_state == SLAP_C_BINDING) {
 560                         conn->c_conn_state = SLAP_C_ACTIVE;
 561                 }
 562         }
 563
 564         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 565                 Debug( LDAP_DEBUG_TRACE,
 566                         "connection_operation: attempting closing conn=%ld sd=%d.\n",
 567                         conn->c_connid, conn->c_sb.sb_sd, 0 );
 568
 569                 connection_close( conn );
 570         }
 571
 572         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 573         active_threads--;
 574         if( active_threads < 1 ) {
 575                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 576         }
 577         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 578
 579         connection_resched( conn );
 580
 581         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 582
 583         return NULL;
 584 }
 585
 586 int connection_read(int s)
 587 {
 588         int rc = 0;
 589         Connection *c;
 590         assert( connections != NULL );
 591
 592         ldap_pvt_thread_mutex_lock( &connections_mutex );
 593
 594         c = connection_get( s );
 595         if( c == NULL ) {
 596                 Debug( LDAP_DEBUG_ANY,
 597                         "connection_read(%d): no connection!\n",
 598                         s, 0, 0 );
 599                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 600                 return -1;
 601         }
 602
 603         if( c->c_conn_state == SLAP_C_CLOSING ) {
 604                 Debug( LDAP_DEBUG_TRACE,
 605                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 606                         s, c->c_connid, 0 );
 607
 608                 connection_return( c );
 609                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 610                 return 0;
 611         }
 612
 613         Debug( LDAP_DEBUG_TRACE,
 614                 "connection_read(%d): checking for input on id=%ld\n",
 615                 s, c->c_connid, 0 );
 616
 617 #define CONNECTION_INPUT_LOOP 1
 618
 619 #ifdef DATA_READY_LOOP
 620         while(!rc && lber_pvt_sb_data_ready(&c->c_sb))
 621 #elif CONNECTION_INPUT_LOOP
 622         while(!rc)
 623 #endif
 624         {
 625                 rc = connection_input( c );
 626         }
 627
 628         if( rc < 0 ) {
 629                 Debug( LDAP_DEBUG_TRACE,
 630                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 631                         s, rc, c->c_connid );
 632
 633                 connection_closing( c );
 634                 connection_close( c );
 635         }
 636
 637         connection_return( c );
 638         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 639         return 0;
 640 }
 641
 642 static int
 643 connection_input(
 644     Connection *conn
 645 )
 646 {
 647         Operation *op;
 648         unsigned long   tag, len;
 649         long            msgid;
 650         BerElement      *ber;
 651
 652         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 653             == NULL ) {
 654                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 655                 return -1;
 656         }
 657
 658         errno = 0;
 659         if ( (tag = ber_get_next( &conn->c_sb, &len, conn->c_currentber ))
 660             != LDAP_TAG_MESSAGE )
 661         {
 662                 int err = errno;
 663
 664                 Debug( LDAP_DEBUG_TRACE,
 665                         "ber_get_next on fd %d failed errno %d (%s)\n",
 666                         lber_pvt_sb_get_desc(&conn->c_sb), err,
 667                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 668                 Debug( LDAP_DEBUG_TRACE,
 669                         "\t*** got %ld of %lu so far\n",
 670                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 671                         conn->c_currentber->ber_len, 0 );
 672
 673                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 674                         /* log, close and send error */
 675                         ber_free( conn->c_currentber, 1 );
 676                         conn->c_currentber = NULL;
 677
 678                         return -2;
 679                 }
 680                 return 1;
 681         }
 682
 683         ber = conn->c_currentber;
 684         conn->c_currentber = NULL;
 685
 686         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 687                 /* log, close and send error */
 688                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 689                     0 );
 690                 ber_free( ber, 1 );
 691                 return -1;
 692         }
 693
 694         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 695                 /* log, close and send error */
 696                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 697                     0 );
 698                 ber_free( ber, 1 );
 699
 700                 return -1;
 701         }
 702
 703 #ifdef LDAP_COMPAT30
 704         if ( conn->c_version == 30 ) {
 705                 (void) ber_skip_tag( ber, &len );
 706         }
 707 #endif
 708
 709         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 710
 711         if ( conn->c_conn_state == SLAP_C_BINDING
 712                 || conn->c_conn_state == SLAP_C_CLOSING )
 713         {
 714                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 715                 slap_op_add( &conn->c_pending_ops, op );
 716
 717         } else {
 718                 connection_op_activate( conn, op );
 719         }
 720
 721 #ifdef NO_THREADS
 722         if ( conn->c_struct_state != SLAP_C_USED ) {
 723                 /* connection must have got closed underneath us */
 724                 return 1;
 725         }
 726 #endif
 727         assert( conn->c_struct_state == SLAP_C_USED );
 728
 729         return 0;
 730 }
 731
 732 static int
 733 connection_resched( Connection *conn )
 734 {
 735         Operation *op;
 736
 737         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 738                 /* other states need different handling */
 739                 return 0;
 740         }
 741
 742         for( op = slap_op_pop( &conn->c_pending_ops );
 743                 op != NULL;
 744                 op = slap_op_pop( &conn->c_pending_ops ) )
 745         {
 746                 /* pending operations should not be marked for abandonment */
 747                 assert(!op->o_abandon);
 748
 749                 connection_op_activate( conn, op );
 750
 751                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 752                         break;
 753                 }
 754         }
 755         return 0;
 756 }
 757
 758 static int connection_op_activate( Connection *conn, Operation *op )
 759 {
 760         struct co_arg *arg;
 761         char *tmpdn;
 762         int status;
 763         unsigned long tag = op->o_tag;
 764
 765         if ( conn->c_dn != NULL ) {
 766                 tmpdn = ch_strdup( conn->c_dn );
 767         } else {
 768                 tmpdn = NULL;
 769         }
 770
 771         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
 772         arg->co_conn = conn;
 773         arg->co_op = op;
 774
 775         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
 776         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
 777
 778         slap_op_add( &conn->c_ops, arg->co_op );
 779
 780         if(tag == LDAP_REQ_BIND) {
 781                 conn->c_conn_state = SLAP_C_BINDING;
 782         }
 783
 784         if ( tmpdn != NULL ) {
 785                 free( tmpdn );
 786         }
 787
 788         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 789         active_threads++;
 790         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 791
 792         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
 793                                          connection_operation, (void *) arg );
 794
 795         if ( status != 0 ) {
 796                 Debug( LDAP_DEBUG_ANY,
 797                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
 798
 799                 /* should move op to pending list */
 800         }
 801
 802         return status;
 803 }
 804
 805 int connection_write(int s)
 806 {
 807         Connection *c;
 808         assert( connections != NULL );
 809
 810         ldap_pvt_thread_mutex_lock( &connections_mutex );
 811
 812         c = connection_get( s );
 813         if( c == NULL ) {
 814                 Debug( LDAP_DEBUG_ANY,
 815                         "connection_write(%d): no connection!\n",
 816                         s, 0, 0 );
 817                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 818                 return -1;
 819         }
 820
 821         Debug( LDAP_DEBUG_TRACE,
 822                 "connection_write(%d): waking output for id=%ld\n",
 823                 s, c->c_connid, 0 );
 824
 825         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 826
 827         connection_return( c );
 828         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 829         return 0;
 830 }