git.sur5r.net Git - openldap/blob - libraries/libldap/request.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2010 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* Portions Copyright (c) 1995 Regents of the University of Michigan.
  16  * All rights reserved.
  17  */
  18 /* This notice applies to changes, created by or for Novell, Inc.,
  19  * to preexisting works for which notices appear elsewhere in this file.
  20  *
  21  * Copyright (C) 1999, 2000 Novell, Inc. All Rights Reserved.
  22  *
  23  * THIS WORK IS SUBJECT TO U.S. AND INTERNATIONAL COPYRIGHT LAWS AND TREATIES.
  24  * USE, MODIFICATION, AND REDISTRIBUTION OF THIS WORK IS SUBJECT TO VERSION
  25  * 2.0.1 OF THE OPENLDAP PUBLIC LICENSE, A COPY OF WHICH IS AVAILABLE AT
  26  * HTTP://WWW.OPENLDAP.ORG/LICENSE.HTML OR IN THE FILE "LICENSE" IN THE
  27  * TOP-LEVEL DIRECTORY OF THE DISTRIBUTION. ANY USE OR EXPLOITATION OF THIS
  28  * WORK OTHER THAN AS AUTHORIZED IN VERSION 2.0.1 OF THE OPENLDAP PUBLIC
  29  * LICENSE, OR OTHER PRIOR WRITTEN CONSENT FROM NOVELL, COULD SUBJECT THE
  30  * PERPETRATOR TO CRIMINAL AND CIVIL LIABILITY.
  31  *---
  32  * Modification to OpenLDAP source by Novell, Inc.
  33  * April 2000 sfs  Added code to chase V3 referrals
  34  *  request.c - sending of ldap requests; handling of referrals
  35  *---
  36  * Note: A verbatim copy of version 2.0.1 of the OpenLDAP Public License
  37  * can be found in the file "build/LICENSE-2.0.1" in this distribution
  38  * of OpenLDAP Software.
  39  */
  40
  41 #include "portable.h"
  42
  43 #include <stdio.h>
  44
  45 #include <ac/stdlib.h>
  46
  47 #include <ac/errno.h>
  48 #include <ac/socket.h>
  49 #include <ac/string.h>
  50 #include <ac/time.h>
  51 #include <ac/unistd.h>
  52
  53 #include "ldap-int.h"
  54 #include "lber.h"
  55
  56 static LDAPConn *find_connection LDAP_P(( LDAP *ld, LDAPURLDesc *srv, int any ));
  57 static void use_connection LDAP_P(( LDAP *ld, LDAPConn *lc ));
  58 static void ldap_free_request_int LDAP_P(( LDAP *ld, LDAPRequest *lr ));
  59
  60 static BerElement *
  61 re_encode_request( LDAP *ld,
  62         BerElement *origber,
  63         ber_int_t msgid,
  64         int sref,
  65         LDAPURLDesc *srv,
  66         int *type );
  67
  68 BerElement *
  69 ldap_alloc_ber_with_options( LDAP *ld )
  70 {
  71         BerElement      *ber;
  72
  73         ber = ber_alloc_t( ld->ld_lberoptions );
  74         if ( ber == NULL ) {
  75                 ld->ld_errno = LDAP_NO_MEMORY;
  76         }
  77
  78         return( ber );
  79 }
  80
  81
  82 void
  83 ldap_set_ber_options( LDAP *ld, BerElement *ber )
  84 {
  85         ber->ber_options = ld->ld_lberoptions;
  86 }
  87
  88
  89 ber_int_t
  90 ldap_send_initial_request(
  91         LDAP *ld,
  92         ber_tag_t msgtype,
  93         const char *dn,
  94         BerElement *ber,
  95         ber_int_t msgid)
  96 {
  97         int rc = 1;
  98
  99         Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
 100
 101 #ifdef LDAP_R_COMPILE
 102         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 103 #endif
 104         if ( ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, NULL ) == -1 ) {
 105                 /* not connected yet */
 106                 rc = ldap_open_defconn( ld );
 107
 108         }
 109 #ifdef LDAP_R_COMPILE
 110         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 111 #endif
 112         if( rc < 0 ) {
 113                 ber_free( ber, 1 );
 114                 return( -1 );
 115         } else if ( rc == 0 ) {
 116                 Debug( LDAP_DEBUG_TRACE,
 117                         "ldap_open_defconn: successful\n",
 118                         0, 0, 0 );
 119         }
 120
 121 #ifdef LDAP_CONNECTIONLESS
 122         if (LDAP_IS_UDP(ld)) {
 123                 if (msgtype == LDAP_REQ_BIND) {
 124                         if (ld->ld_options.ldo_cldapdn)
 125                                 ldap_memfree(ld->ld_options.ldo_cldapdn);
 126                         ld->ld_options.ldo_cldapdn = ldap_strdup(dn);
 127                         ber_free( ber, 1 );
 128                         return 0;
 129                 }
 130                 if (msgtype != LDAP_REQ_ABANDON && msgtype != LDAP_REQ_SEARCH)
 131                 {
 132                         ber_free( ber, 1 );
 133                         return LDAP_PARAM_ERROR;
 134                 }
 135         }
 136 #endif
 137 #ifdef LDAP_R_COMPILE
 138         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 139 #endif
 140         rc = ldap_send_server_request( ld, ber, msgid, NULL,
 141                 NULL, NULL, NULL );
 142 #ifdef LDAP_R_COMPILE
 143         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 144 #endif
 145         return(rc);
 146 }
 147
 148
 149 int
 150 ldap_int_flush_request(
 151         LDAP *ld,
 152         LDAPRequest *lr )
 153 {
 154         LDAPConn *lc = lr->lr_conn;
 155
 156         if ( ber_flush2( lc->lconn_sb, lr->lr_ber, LBER_FLUSH_FREE_NEVER ) != 0 ) {
 157                 if ( sock_errno() == EAGAIN ) {
 158                         /* need to continue write later */
 159                         lr->lr_status = LDAP_REQST_WRITING;
 160                         ldap_mark_select_write( ld, lc->lconn_sb );
 161                         ld->ld_errno = LDAP_BUSY;
 162                         return -2;
 163                 } else {
 164                         ld->ld_errno = LDAP_SERVER_DOWN;
 165                         ldap_free_request( ld, lr );
 166                         ldap_free_connection( ld, lc, 0, 0 );
 167                         return( -1 );
 168                 }
 169         } else {
 170                 if ( lr->lr_parent == NULL ) {
 171                         lr->lr_ber->ber_end = lr->lr_ber->ber_ptr;
 172                         lr->lr_ber->ber_ptr = lr->lr_ber->ber_buf;
 173                 }
 174                 lr->lr_status = LDAP_REQST_INPROGRESS;
 175
 176                 /* sent -- waiting for a response */
 177                 ldap_mark_select_read( ld, lc->lconn_sb );
 178         }
 179         return 0;
 180 }
 181
 182 int
 183 ldap_send_server_request(
 184         LDAP *ld,
 185         BerElement *ber,
 186         ber_int_t msgid,
 187         LDAPRequest *parentreq,
 188         LDAPURLDesc **srvlist,
 189         LDAPConn *lc,
 190         LDAPreqinfo *bind )
 191 {
 192         LDAPRequest     *lr;
 193         int             incparent, rc;
 194
 195         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 196
 197         incparent = 0;
 198         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 199
 200         if ( lc == NULL ) {
 201                 if ( srvlist == NULL ) {
 202                         lc = ld->ld_defconn;
 203                 } else {
 204                         lc = find_connection( ld, *srvlist, 1 );
 205                         if ( lc == NULL ) {
 206                                 if ( (bind != NULL) && (parentreq != NULL) ) {
 207                                         /* Remember the bind in the parent */
 208                                         incparent = 1;
 209                                         ++parentreq->lr_outrefcnt;
 210                                 }
 211                                 lc = ldap_new_connection( ld, srvlist, 0, 1, bind );
 212                         }
 213                 }
 214         }
 215
 216         /* async connect... */
 217         if ( lc != NULL && lc->lconn_status == LDAP_CONNST_CONNECTING ) {
 218                 ber_socket_t    sd = AC_SOCKET_ERROR;
 219                 struct timeval  tv = { 0 };
 220
 221                 ber_sockbuf_ctrl( lc->lconn_sb, LBER_SB_OPT_GET_FD, &sd );
 222
 223                 /* poll ... */
 224                 switch ( ldap_int_poll( ld, sd, &tv ) ) {
 225                 case 0:
 226                         /* go on! */
 227                         lc->lconn_status = LDAP_CONNST_CONNECTED;
 228                         break;
 229
 230                 case -2:
 231                         /* async only occurs if a network timeout is set */
 232
 233                         /* honor network timeout */
 234                         if ( time( NULL ) - lc->lconn_created <= ld->ld_options.ldo_tm_net.tv_sec )
 235                         {
 236                                 /* caller will have to call again */
 237                                 ld->ld_errno = LDAP_X_CONNECTING;
 238                         }
 239                         /* fallthru */
 240
 241                 default:
 242                         /* error */
 243                         break;
 244                 }
 245         }
 246
 247         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 248                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 249                         ld->ld_errno = LDAP_SERVER_DOWN;
 250                 }
 251
 252                 ber_free( ber, 1 );
 253                 if ( incparent ) {
 254                         /* Forget about the bind */
 255                         --parentreq->lr_outrefcnt;
 256                 }
 257                 return( -1 );
 258         }
 259
 260         use_connection( ld, lc );
 261
 262 #ifdef LDAP_CONNECTIONLESS
 263         if ( LDAP_IS_UDP( ld )) {
 264                 BerElement tmpber = *ber;
 265                 ber_rewind( &tmpber );
 266                 rc = ber_write( &tmpber, ld->ld_options.ldo_peer,
 267                         sizeof( struct sockaddr ), 0 );
 268                 if ( rc == -1 ) {
 269                         ld->ld_errno = LDAP_ENCODING_ERROR;
 270                         return rc;
 271                 }
 272         }
 273 #endif
 274
 275         /* If we still have an incomplete write, try to finish it before
 276          * dealing with the new request. If we don't finish here, return
 277          * LDAP_BUSY and let the caller retry later. We only allow a single
 278          * request to be in WRITING state.
 279          */
 280         rc = 0;
 281         if ( ld->ld_requests &&
 282                 ld->ld_requests->lr_status == LDAP_REQST_WRITING &&
 283                 ldap_int_flush_request( ld, ld->ld_requests ) < 0 )
 284         {
 285                 rc = -1;
 286         }
 287         if ( rc ) return rc;
 288
 289         lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ) );
 290         if ( lr == NULL ) {
 291                 ld->ld_errno = LDAP_NO_MEMORY;
 292                 ldap_free_connection( ld, lc, 0, 0 );
 293                 ber_free( ber, 1 );
 294                 if ( incparent ) {
 295                         /* Forget about the bind */
 296                         --parentreq->lr_outrefcnt;
 297                 }
 298                 return( -1 );
 299         }
 300         lr->lr_msgid = msgid;
 301         lr->lr_status = LDAP_REQST_INPROGRESS;
 302         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 303         lr->lr_ber = ber;
 304         lr->lr_conn = lc;
 305         if ( parentreq != NULL ) {      /* sub-request */
 306                 if ( !incparent ) {
 307                         /* Increment if we didn't do it before the bind */
 308                         ++parentreq->lr_outrefcnt;
 309                 }
 310                 lr->lr_origid = parentreq->lr_origid;
 311                 lr->lr_parentcnt = ++parentreq->lr_parentcnt;
 312                 lr->lr_parent = parentreq;
 313                 lr->lr_refnext = parentreq->lr_child;
 314                 parentreq->lr_child = lr;
 315         } else {                        /* original request */
 316                 lr->lr_origid = lr->lr_msgid;
 317         }
 318
 319         /* Extract requestDN for future reference */
 320         {
 321                 BerElement tmpber = *ber;
 322                 ber_int_t       bint;
 323                 ber_tag_t       tag, rtag;
 324
 325                 ber_reset( &tmpber, 1 );
 326                 rtag = ber_scanf( &tmpber, "{it", /*}*/ &bint, &tag );
 327                 switch ( tag ) {
 328                 case LDAP_REQ_BIND:
 329                         rtag = ber_scanf( &tmpber, "{i" /*}*/, &bint );
 330                         break;
 331                 case LDAP_REQ_DELETE:
 332                         break;
 333                 default:
 334                         rtag = ber_scanf( &tmpber, "{" /*}*/ );
 335                 case LDAP_REQ_ABANDON:
 336                         break;
 337                 }
 338                 if ( tag != LDAP_REQ_ABANDON ) {
 339                         ber_skip_tag( &tmpber, &lr->lr_dn.bv_len );
 340                         lr->lr_dn.bv_val = tmpber.ber_ptr;
 341                 }
 342         }
 343
 344         lr->lr_prev = NULL;
 345         lr->lr_next = ld->ld_requests;
 346         if ( lr->lr_next != NULL ) {
 347                 lr->lr_next->lr_prev = lr;
 348         }
 349         ld->ld_requests = lr;
 350
 351         ld->ld_errno = LDAP_SUCCESS;
 352         if ( ldap_int_flush_request( ld, lr ) == -1 ) {
 353                 msgid = -1;
 354         }
 355
 356         return( msgid );
 357 }
 358
 359 /* return 0 if no StartTLS ext, 1 if present, 2 if critical */
 360 static int
 361 find_tls_ext( LDAPURLDesc *srv )
 362 {
 363         int i, crit;
 364         char *ext;
 365
 366         if ( !srv->lud_exts )
 367                 return 0;
 368
 369         for (i=0; srv->lud_exts[i]; i++) {
 370                 crit = 0;
 371                 ext = srv->lud_exts[i];
 372                 if ( ext[0] == '!') {
 373                         ext++;
 374                         crit = 1;
 375                 }
 376                 if ( !strcasecmp( ext, "StartTLS" ) ||
 377                         !strcasecmp( ext, "X-StartTLS" ) ||
 378                         !strcmp( ext, LDAP_EXOP_START_TLS )) {
 379                         return crit + 1;
 380                 }
 381         }
 382         return 0;
 383 }
 384
 385 LDAPConn *
 386 ldap_new_connection( LDAP *ld, LDAPURLDesc **srvlist, int use_ldsb,
 387         int connect, LDAPreqinfo *bind )
 388 {
 389         LDAPConn        *lc;
 390         int             async = 0;
 391
 392         Debug( LDAP_DEBUG_TRACE, "ldap_new_connection %d %d %d\n",
 393                 use_ldsb, connect, (bind != NULL) );
 394         /*
 395          * make a new LDAP server connection
 396          * XXX open connection synchronously for now
 397          */
 398         lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ) );
 399         if ( lc == NULL ) {
 400                 ld->ld_errno = LDAP_NO_MEMORY;
 401                 return( NULL );
 402         }
 403
 404         if ( use_ldsb ) {
 405                 assert( ld->ld_sb != NULL );
 406                 lc->lconn_sb = ld->ld_sb;
 407
 408         } else {
 409                 lc->lconn_sb = ber_sockbuf_alloc();
 410                 if ( lc->lconn_sb == NULL ) {
 411                         LDAP_FREE( (char *)lc );
 412                         ld->ld_errno = LDAP_NO_MEMORY;
 413                         return( NULL );
 414                 }
 415         }
 416
 417         if ( connect ) {
 418                 LDAPURLDesc     **srvp, *srv = NULL;
 419
 420                 async = LDAP_BOOL_GET( &ld->ld_options, LDAP_BOOL_CONNECT_ASYNC );
 421
 422                 for ( srvp = srvlist; *srvp != NULL; srvp = &(*srvp)->lud_next ) {
 423                         int             rc;
 424
 425                         rc = ldap_int_open_connection( ld, lc, *srvp, async );
 426                         if ( rc != -1 ) {
 427                                 srv = *srvp;
 428
 429                                 if ( ld->ld_urllist_proc && ( !async || rc != -2 ) ) {
 430                                         ld->ld_urllist_proc( ld, srvlist, srvp, ld->ld_urllist_params );
 431                                 }
 432
 433                                 break;
 434                         }
 435                 }
 436
 437                 if ( srv == NULL ) {
 438                         if ( !use_ldsb ) {
 439                                 ber_sockbuf_free( lc->lconn_sb );
 440                         }
 441                         LDAP_FREE( (char *)lc );
 442                         ld->ld_errno = LDAP_SERVER_DOWN;
 443                         return( NULL );
 444                 }
 445
 446                 lc->lconn_server = ldap_url_dup( srv );
 447         }
 448
 449         lc->lconn_status = async ? LDAP_CONNST_CONNECTING : LDAP_CONNST_CONNECTED;
 450 #ifdef LDAP_R_COMPILE
 451         ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 452 #endif
 453         lc->lconn_next = ld->ld_conns;
 454         ld->ld_conns = lc;
 455 #ifdef LDAP_R_COMPILE
 456         ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 457 #endif
 458
 459         if ( connect ) {
 460 #ifdef HAVE_TLS
 461                 if ( lc->lconn_server->lud_exts ) {
 462                         int rc, ext = find_tls_ext( lc->lconn_server );
 463                         if ( ext ) {
 464                                 LDAPConn        *savedefconn;
 465
 466                                 savedefconn = ld->ld_defconn;
 467                                 ++lc->lconn_refcnt;     /* avoid premature free */
 468                                 ld->ld_defconn = lc;
 469
 470 #ifdef LDAP_R_COMPILE
 471                                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 472                                 ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 473 #endif
 474                                 rc = ldap_start_tls_s( ld, NULL, NULL );
 475 #ifdef LDAP_R_COMPILE
 476                                 ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 477                                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 478 #endif
 479                                 ld->ld_defconn = savedefconn;
 480                                 --lc->lconn_refcnt;
 481
 482                                 if ( rc != LDAP_SUCCESS && ext == 2 ) {
 483                                         ldap_free_connection( ld, lc, 1, 0 );
 484                                         return NULL;
 485                                 }
 486                         }
 487                 }
 488 #endif
 489         }
 490
 491         if ( bind != NULL ) {
 492                 int             err = 0;
 493                 LDAPConn        *savedefconn;
 494
 495                 /* Set flag to prevent additional referrals
 496                  * from being processed on this
 497                  * connection until the bind has completed
 498                  */
 499                 lc->lconn_rebind_inprogress = 1;
 500                 /* V3 rebind function */
 501                 if ( ld->ld_rebind_proc != NULL) {
 502                         LDAPURLDesc     *srvfunc;
 503
 504                         srvfunc = ldap_url_dup( *srvlist );
 505                         if ( srvfunc == NULL ) {
 506                                 ld->ld_errno = LDAP_NO_MEMORY;
 507                                 err = -1;
 508                         } else {
 509                                 savedefconn = ld->ld_defconn;
 510                                 ++lc->lconn_refcnt;     /* avoid premature free */
 511                                 ld->ld_defconn = lc;
 512
 513                                 Debug( LDAP_DEBUG_TRACE, "Call application rebind_proc\n", 0, 0, 0);
 514 #ifdef LDAP_R_COMPILE
 515                                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 516                                 ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 517 #endif
 518                                 err = (*ld->ld_rebind_proc)( ld,
 519                                         bind->ri_url, bind->ri_request, bind->ri_msgid,
 520                                         ld->ld_rebind_params );
 521 #ifdef LDAP_R_COMPILE
 522                                 ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 523                                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 524 #endif
 525
 526                                 ld->ld_defconn = savedefconn;
 527                                 --lc->lconn_refcnt;
 528
 529                                 if ( err != 0 ) {
 530                                         err = -1;
 531                                         ldap_free_connection( ld, lc, 1, 0 );
 532                                         lc = NULL;
 533                                 }
 534                                 ldap_free_urldesc( srvfunc );
 535                         }
 536
 537                 } else {
 538                         int             msgid, rc;
 539                         struct berval   passwd = BER_BVNULL;
 540
 541                         savedefconn = ld->ld_defconn;
 542                         ++lc->lconn_refcnt;     /* avoid premature free */
 543                         ld->ld_defconn = lc;
 544
 545                         Debug( LDAP_DEBUG_TRACE,
 546                                 "anonymous rebind via ldap_sasl_bind(\"\")\n",
 547                                 0, 0, 0);
 548
 549 #ifdef LDAP_R_COMPILE
 550                         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 551                         ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 552 #endif
 553                         rc = ldap_sasl_bind( ld, "", LDAP_SASL_SIMPLE, &passwd,
 554                                 NULL, NULL, &msgid );
 555                         if ( rc != LDAP_SUCCESS ) {
 556                                 err = -1;
 557
 558                         } else {
 559                                 for ( err = 1; err > 0; ) {
 560                                         struct timeval  tv = { 0, 100000 };
 561                                         LDAPMessage     *res = NULL;
 562
 563                                         switch ( ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res ) ) {
 564                                         case -1:
 565                                                 err = -1;
 566                                                 break;
 567
 568                                         case 0:
 569 #ifdef LDAP_R_COMPILE
 570                                                 ldap_pvt_thread_yield();
 571 #endif
 572                                                 break;
 573
 574                                         case LDAP_RES_BIND:
 575                                                 rc = ldap_parse_result( ld, res, &err, NULL, NULL, NULL, NULL, 1 );
 576                                                 if ( rc != LDAP_SUCCESS ) {
 577                                                         err = -1;
 578
 579                                                 } else if ( err != LDAP_SUCCESS ) {
 580                                                         err = -1;
 581                                                 }
 582                                                 /* else err == LDAP_SUCCESS == 0 */
 583                                                 break;
 584
 585                                         default:
 586                                                 Debug( LDAP_DEBUG_TRACE,
 587                                                         "ldap_new_connection %p: "
 588                                                         "unexpected response %d "
 589                                                         "from BIND request id=%d\n",
 590                                                         (void *) ld, ldap_msgtype( res ), msgid );
 591                                                 err = -1;
 592                                                 break;
 593                                         }
 594                                 }
 595                         }
 596 #ifdef LDAP_R_COMPILE
 597                         ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 598                         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 599 #endif
 600                         ld->ld_defconn = savedefconn;
 601                         --lc->lconn_refcnt;
 602
 603                         if ( err != 0 ) {
 604                                 ldap_free_connection( ld, lc, 1, 0 );
 605                                 lc = NULL;
 606                         }
 607                 }
 608                 if ( lc != NULL )
 609                         lc->lconn_rebind_inprogress = 0;
 610         }
 611
 612         return( lc );
 613 }
 614
 615
 616 static LDAPConn *
 617 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 618 /*
 619  * return an existing connection (if any) to the server srv
 620  * if "any" is non-zero, check for any server in the "srv" chain
 621  */
 622 {
 623         LDAPConn        *lc;
 624         LDAPURLDesc     *lcu, *lsu;
 625         int lcu_port, lsu_port;
 626         int found = 0;
 627
 628 #ifdef LDAP_R_COMPILE
 629         ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 630 #endif
 631         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 632                 lcu = lc->lconn_server;
 633                 lcu_port = ldap_pvt_url_scheme_port( lcu->lud_scheme,
 634                         lcu->lud_port );
 635
 636                 for ( lsu = srv; lsu != NULL; lsu = lsu->lud_next ) {
 637                         lsu_port = ldap_pvt_url_scheme_port( lsu->lud_scheme,
 638                                 lsu->lud_port );
 639
 640                         if ( lsu_port == lcu_port
 641                                 && strcmp( lcu->lud_scheme, lsu->lud_scheme ) == 0
 642                                 && lcu->lud_host != NULL && lsu->lud_host != NULL
 643                                 && strcasecmp( lsu->lud_host, lcu->lud_host ) == 0 )
 644                         {
 645                                 found = 1;
 646                                 break;
 647                         }
 648
 649                         if ( !any ) break;
 650                 }
 651                 if ( found )
 652                         break;
 653         }
 654 #ifdef LDAP_R_COMPILE
 655         ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 656 #endif
 657         return lc;
 658 }
 659
 660
 661
 662 static void
 663 use_connection( LDAP *ld, LDAPConn *lc )
 664 {
 665         ++lc->lconn_refcnt;
 666         lc->lconn_lastused = time( NULL );
 667 }
 668
 669
 670 void
 671 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 672 {
 673         LDAPConn        *tmplc, *prevlc;
 674
 675         Debug( LDAP_DEBUG_TRACE,
 676                 "ldap_free_connection %d %d\n",
 677                 force, unbind, 0 );
 678
 679         if ( force || --lc->lconn_refcnt <= 0 ) {
 680                 /* remove from connections list first */
 681 #ifdef LDAP_R_COMPILE
 682                 ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 683 #endif
 684
 685                 for ( prevlc = NULL, tmplc = ld->ld_conns;
 686                         tmplc != NULL;
 687                         tmplc = tmplc->lconn_next )
 688                 {
 689                         if ( tmplc == lc ) {
 690                                 if ( prevlc == NULL ) {
 691                                     ld->ld_conns = tmplc->lconn_next;
 692                                 } else {
 693                                     prevlc->lconn_next = tmplc->lconn_next;
 694                                 }
 695                                 if ( ld->ld_defconn == lc ) {
 696                                         ld->ld_defconn = NULL;
 697                                 }
 698                                 break;
 699                         }
 700                         prevlc = tmplc;
 701                 }
 702 #ifdef LDAP_R_COMPILE
 703                 ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 704 #endif
 705
 706                 /* process connection callbacks */
 707                 {
 708                         struct ldapoptions *lo;
 709                         ldaplist *ll;
 710                         ldap_conncb *cb;
 711
 712                         lo = &ld->ld_options;
 713                         if ( lo->ldo_conn_cbs ) {
 714                                 for ( ll=lo->ldo_conn_cbs; ll; ll=ll->ll_next ) {
 715                                         cb = ll->ll_data;
 716                                         cb->lc_del( ld, lc->lconn_sb, cb );
 717                                 }
 718                         }
 719                         lo = LDAP_INT_GLOBAL_OPT();
 720                         if ( lo->ldo_conn_cbs ) {
 721                                 for ( ll=lo->ldo_conn_cbs; ll; ll=ll->ll_next ) {
 722                                         cb = ll->ll_data;
 723                                         cb->lc_del( ld, lc->lconn_sb, cb );
 724                                 }
 725                         }
 726                 }
 727
 728                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 729                         ldap_mark_select_clear( ld, lc->lconn_sb );
 730                         if ( unbind ) {
 731                                 ldap_send_unbind( ld, lc->lconn_sb,
 732                                                 NULL, NULL );
 733                         }
 734                 }
 735
 736                 if ( lc->lconn_ber != NULL ) {
 737                         ber_free( lc->lconn_ber, 1 );
 738                 }
 739
 740                 ldap_int_sasl_close( ld, lc );
 741 #ifdef HAVE_GSSAPI
 742                 ldap_int_gssapi_close( ld, lc );
 743 #endif
 744
 745                 ldap_free_urllist( lc->lconn_server );
 746
 747                 /* FIXME: is this at all possible?
 748                  * ldap_ld_free() in unbind.c calls ldap_free_connection()
 749                  * with force == 1 __after__ explicitly calling
 750                  * ldap_free_request() on all requests */
 751                 if ( force ) {
 752                         LDAPRequest     *lr;
 753
 754                         for ( lr = ld->ld_requests; lr; ) {
 755                                 LDAPRequest     *lr_next = lr->lr_next;
 756
 757                                 if ( lr->lr_conn == lc ) {
 758                                         ldap_free_request_int( ld, lr );
 759                                 }
 760
 761                                 lr = lr_next;
 762                         }
 763                 }
 764
 765                 if ( lc->lconn_sb != ld->ld_sb ) {
 766                         ber_sockbuf_free( lc->lconn_sb );
 767                 } else {
 768                         ber_int_sb_close( lc->lconn_sb );
 769                 }
 770
 771                 if ( lc->lconn_rebind_queue != NULL) {
 772                         int i;
 773                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 774                                 LDAP_VFREE( lc->lconn_rebind_queue[i] );
 775                         }
 776                         LDAP_FREE( lc->lconn_rebind_queue );
 777                 }
 778
 779                 LDAP_FREE( lc );
 780
 781                 Debug( LDAP_DEBUG_TRACE,
 782                         "ldap_free_connection: actually freed\n",
 783                         0, 0, 0 );
 784
 785         } else {
 786                 lc->lconn_lastused = time( NULL );
 787                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 788                                 lc->lconn_refcnt, 0, 0 );
 789         }
 790 }
 791
 792
 793 #ifdef LDAP_DEBUG
 794 void
 795 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 796 {
 797         LDAPConn        *lc;
 798         char            timebuf[32];
 799
 800         Debug( LDAP_DEBUG_TRACE, "** ld %p Connection%s:\n", (void *)ld, all ? "s" : "", 0 );
 801         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 802                 if ( lc->lconn_server != NULL ) {
 803                         Debug( LDAP_DEBUG_TRACE, "* host: %s  port: %d%s\n",
 804                                 ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 805                                 : lc->lconn_server->lud_host,
 806                                 lc->lconn_server->lud_port, ( lc->lconn_sb ==
 807                                 ld->ld_sb ) ? "  (default)" : "" );
 808                 }
 809                 Debug( LDAP_DEBUG_TRACE, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 810                         ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET )
 811                                 ? "NeedSocket" :
 812                                 ( lc->lconn_status == LDAP_CONNST_CONNECTING )
 813                                         ? "Connecting" : "Connected", 0 );
 814                 Debug( LDAP_DEBUG_TRACE, "  last used: %s%s\n",
 815                         ldap_pvt_ctime( &lc->lconn_lastused, timebuf ),
 816                         lc->lconn_rebind_inprogress ? "  rebind in progress" : "", 0 );
 817                 if ( lc->lconn_rebind_inprogress ) {
 818                         if ( lc->lconn_rebind_queue != NULL) {
 819                                 int     i;
 820
 821                                 for ( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 822                                         int     j;
 823                                         for( j = 0; lc->lconn_rebind_queue[i][j] != 0; j++ ) {
 824                                                 Debug( LDAP_DEBUG_TRACE, "    queue %d entry %d - %s\n",
 825                                                         i, j, lc->lconn_rebind_queue[i][j] );
 826                                         }
 827                                 }
 828                         } else {
 829                                 Debug( LDAP_DEBUG_TRACE, "    queue is empty\n", 0, 0, 0 );
 830                         }
 831                 }
 832                 Debug( LDAP_DEBUG_TRACE, "\n", 0, 0, 0 );
 833                 if ( !all ) {
 834                         break;
 835                 }
 836         }
 837 }
 838
 839
 840 void
 841 ldap_dump_requests_and_responses( LDAP *ld )
 842 {
 843         LDAPRequest     *lr;
 844         LDAPMessage     *lm, *l;
 845         int             i;
 846
 847         Debug( LDAP_DEBUG_TRACE, "** ld %p Outstanding Requests:\n",
 848                 (void *)ld, 0, 0 );
 849         lr = ld->ld_requests;
 850         if ( lr == NULL ) {
 851                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 852         }
 853         for ( i = 0; lr != NULL; lr = lr->lr_next, i++ ) {
 854                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  origid %d, status %s\n",
 855                         lr->lr_msgid, lr->lr_origid,
 856                         ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 857                         ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 858                         ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 859                         ( lr->lr_status == LDAP_REQST_WRITING ) ? "Writing" :
 860                         ( lr->lr_status == LDAP_REQST_COMPLETED ) ? "RequestCompleted"
 861                                 : "InvalidStatus" );
 862                 Debug( LDAP_DEBUG_TRACE, "   outstanding referrals %d, parent count %d\n",
 863                         lr->lr_outrefcnt, lr->lr_parentcnt, 0 );
 864         }
 865         Debug( LDAP_DEBUG_TRACE, "  ld %p request count %d (abandoned %lu)\n",
 866                 (void *)ld, i, ld->ld_nabandoned );
 867         Debug( LDAP_DEBUG_TRACE, "** ld %p Response Queue:\n", (void *)ld, 0, 0 );
 868         if ( ( lm = ld->ld_responses ) == NULL ) {
 869                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 870         }
 871         for ( i = 0; lm != NULL; lm = lm->lm_next, i++ ) {
 872                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  type %lu\n",
 873                     lm->lm_msgid, (unsigned long)lm->lm_msgtype, 0 );
 874                 if ( lm->lm_chain != NULL ) {
 875                         Debug( LDAP_DEBUG_TRACE, "   chained responses:\n", 0, 0, 0 );
 876                         for ( l = lm->lm_chain; l != NULL; l = l->lm_chain ) {
 877                                 Debug( LDAP_DEBUG_TRACE,
 878                                         "  * msgid %d,  type %lu\n",
 879                                         l->lm_msgid,
 880                                         (unsigned long)l->lm_msgtype, 0 );
 881                         }
 882                 }
 883         }
 884         Debug( LDAP_DEBUG_TRACE, "  ld %p response count %d\n", (void *)ld, i, 0 );
 885 }
 886 #endif /* LDAP_DEBUG */
 887
 888 static void
 889 ldap_free_request_int( LDAP *ld, LDAPRequest *lr )
 890 {
 891         /* if lr_refcnt > 0, the request has been looked up
 892          * by ldap_find_request_by_msgid(); if in the meanwhile
 893          * the request is free()'d by someone else, just decrease
 894          * the reference count and extract it from the request
 895          * list; later on, it will be freed. */
 896         if ( lr->lr_prev == NULL ) {
 897                 if ( lr->lr_refcnt == 0 ) {
 898                         /* free'ing the first request? */
 899                         assert( ld->ld_requests == lr );
 900                 }
 901
 902                 if ( ld->ld_requests == lr ) {
 903                         ld->ld_requests = lr->lr_next;
 904                 }
 905
 906         } else {
 907                 lr->lr_prev->lr_next = lr->lr_next;
 908         }
 909
 910         if ( lr->lr_next != NULL ) {
 911                 lr->lr_next->lr_prev = lr->lr_prev;
 912         }
 913
 914         if ( lr->lr_refcnt > 0 ) {
 915                 lr->lr_refcnt = -lr->lr_refcnt;
 916
 917                 lr->lr_prev = NULL;
 918                 lr->lr_next = NULL;
 919
 920                 return;
 921         }
 922
 923         if ( lr->lr_ber != NULL ) {
 924                 ber_free( lr->lr_ber, 1 );
 925                 lr->lr_ber = NULL;
 926         }
 927
 928         if ( lr->lr_res_error != NULL ) {
 929                 LDAP_FREE( lr->lr_res_error );
 930                 lr->lr_res_error = NULL;
 931         }
 932
 933         if ( lr->lr_res_matched != NULL ) {
 934                 LDAP_FREE( lr->lr_res_matched );
 935                 lr->lr_res_matched = NULL;
 936         }
 937
 938         LDAP_FREE( lr );
 939 }
 940
 941 void
 942 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 943 {
 944 #ifdef LDAP_R_COMPILE
 945         LDAP_PVT_THREAD_ASSERT_MUTEX_OWNER( &ld->ld_req_mutex );
 946 #endif
 947
 948         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 949                 lr->lr_origid, lr->lr_msgid, 0 );
 950
 951         /* free all referrals (child requests) */
 952         while ( lr->lr_child ) {
 953                 ldap_free_request( ld, lr->lr_child );
 954         }
 955
 956         if ( lr->lr_parent != NULL ) {
 957                 LDAPRequest     **lrp;
 958
 959                 --lr->lr_parent->lr_outrefcnt;
 960                 for ( lrp = &lr->lr_parent->lr_child;
 961                         *lrp && *lrp != lr;
 962                         lrp = &(*lrp)->lr_refnext );
 963
 964                 if ( *lrp == lr ) {
 965                         *lrp = lr->lr_refnext;
 966                 }
 967         }
 968         ldap_free_request_int( ld, lr );
 969 }
 970
 971 /*
 972  * call first time with *cntp = -1
 973  * when returns *cntp == -1, no referrals are left
 974  *
 975  * NOTE: may replace *refsp, or shuffle the contents
 976  * of the original array.
 977  */
 978 static int ldap_int_nextref(
 979         LDAP                    *ld,
 980         char                    ***refsp,
 981         int                     *cntp,
 982         void                    *params )
 983 {
 984         assert( refsp != NULL );
 985         assert( *refsp != NULL );
 986         assert( cntp != NULL );
 987
 988         if ( *cntp < -1 ) {
 989                 *cntp = -1;
 990                 return -1;
 991         }
 992
 993         (*cntp)++;
 994
 995         if ( (*refsp)[ *cntp ] == NULL ) {
 996                 *cntp = -1;
 997         }
 998
 999         return 0;
1000 }
1001
1002 /*
1003  * Chase v3 referrals
1004  *
1005  * Parameters:
1006  *  (IN) ld = LDAP connection handle
1007  *  (IN) lr = LDAP Request structure
1008  *  (IN) refs = array of pointers to referral strings that we will chase
1009  *              The array will be free'd by this function when no longer needed
1010  *  (IN) sref != 0 if following search reference
1011  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
1012  *  (OUT) hadrefp = 1 if sucessfully followed referral
1013  *
1014  * Return value - number of referrals followed
1015  */
1016 int
1017 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
1018 {
1019         char            *unfollowed;
1020         int              unfollowedcnt = 0;
1021         LDAPRequest     *origreq;
1022         LDAPURLDesc     *srv = NULL;
1023         BerElement      *ber;
1024         char            **refarray = NULL;
1025         LDAPConn        *lc;
1026         int                      rc, count, i, j, id;
1027         LDAPreqinfo  rinfo;
1028
1029         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
1030         *hadrefp = 0;
1031
1032         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
1033
1034         unfollowed = NULL;
1035         rc = count = 0;
1036
1037         /* If no referrals in array, return */
1038         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
1039                 rc = 0;
1040                 goto done;
1041         }
1042
1043         /* Check for hop limit exceeded */
1044         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
1045                 Debug( LDAP_DEBUG_ANY,
1046                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
1047                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
1048                 rc = -1;
1049                 goto done;
1050         }
1051
1052         /* find original request */
1053         for ( origreq = lr;
1054                 origreq->lr_parent != NULL;
1055                 origreq = origreq->lr_parent )
1056         {
1057                 /* empty */ ;
1058         }
1059
1060         refarray = refs;
1061         refs = NULL;
1062
1063         if ( ld->ld_nextref_proc == NULL ) {
1064                 ld->ld_nextref_proc = ldap_int_nextref;
1065         }
1066
1067         /* parse out & follow referrals */
1068         i = -1;
1069         for ( ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params );
1070                         i != -1;
1071                         ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params ) )
1072         {
1073
1074                 /* Parse the referral URL */
1075                 rc = ldap_url_parse_ext( refarray[i], &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
1076                 if ( rc != LDAP_URL_SUCCESS ) {
1077                         /* ldap_url_parse_ext() returns LDAP_URL_* errors
1078                          * which do not map on API errors */
1079                         ld->ld_errno = LDAP_PARAM_ERROR;
1080                         rc = -1;
1081                         goto done;
1082                 }
1083
1084                 if( srv->lud_crit_exts ) {
1085                         int ok = 0;
1086 #ifdef HAVE_TLS
1087                         /* If StartTLS is the only critical ext, OK. */
1088                         if ( find_tls_ext( srv ) == 2 && srv->lud_crit_exts == 1 )
1089                                 ok = 1;
1090 #endif
1091                         if ( !ok ) {
1092                                 /* we do not support any other extensions */
1093                                 ld->ld_errno = LDAP_NOT_SUPPORTED;
1094                                 rc = -1;
1095                                 goto done;
1096                         }
1097                 }
1098
1099                 /* check connection for re-bind in progress */
1100                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1101                         /* See if we've already requested this DN with this conn */
1102                         LDAPRequest *lp;
1103                         int looped = 0;
1104                         ber_len_t len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1105                         for ( lp = origreq; lp; ) {
1106                                 if ( lp->lr_conn == lc
1107                                         && len == lp->lr_dn.bv_len
1108                                         && len
1109                                         && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) == 0 )
1110                                 {
1111                                         looped = 1;
1112                                         break;
1113                                 }
1114                                 if ( lp == origreq ) {
1115                                         lp = lp->lr_child;
1116                                 } else {
1117                                         lp = lp->lr_refnext;
1118                                 }
1119                         }
1120                         if ( looped ) {
1121                                 ldap_free_urllist( srv );
1122                                 srv = NULL;
1123                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1124                                 rc = -1;
1125                                 continue;
1126                         }
1127
1128                         if ( lc->lconn_rebind_inprogress ) {
1129                                 /* We are already chasing a referral or search reference and a
1130                                  * bind on that connection is in progress.  We must queue
1131                                  * referrals on that connection, so we don't get a request
1132                                  * going out before the bind operation completes. This happens
1133                                  * if two search references come in one behind the other
1134                                  * for the same server with different contexts.
1135                                  */
1136                                 Debug( LDAP_DEBUG_TRACE,
1137                                         "ldap_chase_v3referrals: queue referral \"%s\"\n",
1138                                         refarray[i], 0, 0);
1139                                 if( lc->lconn_rebind_queue == NULL ) {
1140                                         /* Create a referral list */
1141                                         lc->lconn_rebind_queue =
1142                                                 (char ***) LDAP_MALLOC( sizeof(void *) * 2);
1143
1144                                         if( lc->lconn_rebind_queue == NULL) {
1145                                                 ld->ld_errno = LDAP_NO_MEMORY;
1146                                                 rc = -1;
1147                                                 goto done;
1148                                         }
1149
1150                                         lc->lconn_rebind_queue[0] = refarray;
1151                                         lc->lconn_rebind_queue[1] = NULL;
1152                                         refarray = NULL;
1153
1154                                 } else {
1155                                         /* Count how many referral arrays we already have */
1156                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
1157                                                 /* empty */;
1158                                         }
1159
1160                                         /* Add the new referral to the list */
1161                                         lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
1162                                                 lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
1163
1164                                         if( lc->lconn_rebind_queue == NULL ) {
1165                                                 ld->ld_errno = LDAP_NO_MEMORY;
1166                                                 rc = -1;
1167                                                 goto done;
1168                                         }
1169                                         lc->lconn_rebind_queue[j] = refarray;
1170                                         lc->lconn_rebind_queue[j+1] = NULL;
1171                                         refarray = NULL;
1172                                 }
1173
1174                                 /* We have queued the referral/reference, now just return */
1175                                 rc = 0;
1176                                 *hadrefp = 1;
1177                                 count = 1; /* Pretend we already followed referral */
1178                                 goto done;
1179                         }
1180                 }
1181                 /* Re-encode the request with the new starting point of the search.
1182                  * Note: In the future we also need to replace the filter if one
1183                  * was provided with the search reference
1184                  */
1185
1186                 /* For references we don't want old dn if new dn empty */
1187                 if ( sref && srv->lud_dn == NULL ) {
1188                         srv->lud_dn = LDAP_STRDUP( "" );
1189                 }
1190
1191                 LDAP_NEXT_MSGID( ld, id );
1192                 ber = re_encode_request( ld, origreq->lr_ber, id,
1193                         sref, srv, &rinfo.ri_request );
1194
1195                 if( ber == NULL ) {
1196                         ld->ld_errno = LDAP_ENCODING_ERROR;
1197                         rc = -1;
1198                         goto done;
1199                 }
1200
1201                 Debug( LDAP_DEBUG_TRACE,
1202                         "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
1203                         lr->lr_msgid, refarray[i], 0);
1204
1205                 /* Send the new request to the server - may require a bind */
1206                 rinfo.ri_msgid = origreq->lr_origid;
1207                 rinfo.ri_url = refarray[i];
1208 #ifdef LDAP_R_COMPILE
1209                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1210 #endif
1211                 rc = ldap_send_server_request( ld, ber, id,
1212                         origreq, &srv, NULL, &rinfo );
1213 #ifdef LDAP_R_COMPILE
1214                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1215 #endif
1216                 if ( rc < 0 ) {
1217                         /* Failure, try next referral in the list */
1218                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%d: %s)\n",
1219                                 refarray[i], ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1220                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i] );
1221                         ldap_free_urllist( srv );
1222                         srv = NULL;
1223                         ld->ld_errno = LDAP_REFERRAL;
1224                 } else {
1225                         /* Success, no need to try this referral list further */
1226                         rc = 0;
1227                         ++count;
1228                         *hadrefp = 1;
1229
1230                         /* check if there is a queue of referrals that came in during bind */
1231                         if ( lc == NULL) {
1232                                 lc = find_connection( ld, srv, 1 );
1233                                 if ( lc == NULL ) {
1234                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
1235                                         rc = -1;
1236                                         goto done;
1237                                 }
1238                         }
1239
1240                         if ( lc->lconn_rebind_queue != NULL ) {
1241                                 /* Release resources of previous list */
1242                                 LDAP_VFREE( refarray );
1243                                 refarray = NULL;
1244                                 ldap_free_urllist( srv );
1245                                 srv = NULL;
1246
1247                                 /* Pull entries off end of queue so list always null terminated */
1248                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++ )
1249                                         ;
1250                                 refarray = lc->lconn_rebind_queue[j - 1];
1251                                 lc->lconn_rebind_queue[j-1] = NULL;
1252                                 /* we pulled off last entry from queue, free queue */
1253                                 if ( j == 1 ) {
1254                                         LDAP_FREE( lc->lconn_rebind_queue );
1255                                         lc->lconn_rebind_queue = NULL;
1256                                 }
1257                                 /* restart the loop the with new referral list */
1258                                 i = -1;
1259                                 continue;
1260                         }
1261                         break; /* referral followed, break out of for loop */
1262                 }
1263         } /* end for loop */
1264 done:
1265         LDAP_VFREE( refarray );
1266         ldap_free_urllist( srv );
1267         LDAP_FREE( *errstrp );
1268
1269         if( rc == 0 ) {
1270                 *errstrp = NULL;
1271                 LDAP_FREE( unfollowed );
1272                 return count;
1273         } else {
1274                 *errstrp = unfollowed;
1275                 return rc;
1276         }
1277 }
1278
1279 /*
1280  * XXX merging of errors in this routine needs to be improved
1281  */
1282 int
1283 ldap_chase_referrals( LDAP *ld,
1284         LDAPRequest *lr,
1285         char **errstrp,
1286         int sref,
1287         int *hadrefp )
1288 {
1289         int             rc, count, id;
1290         unsigned        len;
1291         char            *p, *ref, *unfollowed;
1292         LDAPRequest     *origreq;
1293         LDAPURLDesc     *srv;
1294         BerElement      *ber;
1295         LDAPreqinfo  rinfo;
1296         LDAPConn        *lc;
1297
1298         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
1299
1300         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
1301         *hadrefp = 0;
1302
1303         if ( *errstrp == NULL ) {
1304                 return( 0 );
1305         }
1306
1307         len = strlen( *errstrp );
1308         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
1309                 if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
1310                         *p = '\0';
1311                         p += LDAP_REF_STR_LEN;
1312                         break;
1313                 }
1314         }
1315
1316         if ( len < LDAP_REF_STR_LEN ) {
1317                 return( 0 );
1318         }
1319
1320         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
1321                 Debug( LDAP_DEBUG_ANY,
1322                     "more than %d referral hops (dropping)\n",
1323                     ld->ld_refhoplimit, 0, 0 );
1324                     /* XXX report as error in ld->ld_errno? */
1325                     return( 0 );
1326         }
1327
1328         /* find original request */
1329         for ( origreq = lr; origreq->lr_parent != NULL;
1330              origreq = origreq->lr_parent ) {
1331                 /* empty */;
1332         }
1333
1334         unfollowed = NULL;
1335         rc = count = 0;
1336
1337         /* parse out & follow referrals */
1338         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
1339                 p = strchr( ref, '\n' );
1340                 if ( p != NULL ) {
1341                         *p++ = '\0';
1342                 }
1343
1344                 rc = ldap_url_parse_ext( ref, &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
1345                 if ( rc != LDAP_URL_SUCCESS ) {
1346                         Debug( LDAP_DEBUG_TRACE,
1347                                 "ignoring %s referral <%s>\n",
1348                                 ref, rc == LDAP_URL_ERR_BADSCHEME ? "unknown" : "incorrect", 0 );
1349                         rc = ldap_append_referral( ld, &unfollowed, ref );
1350                         *hadrefp = 1;
1351                         continue;
1352                 }
1353
1354                 Debug( LDAP_DEBUG_TRACE,
1355                     "chasing LDAP referral: <%s>\n", ref, 0, 0 );
1356
1357                 *hadrefp = 1;
1358
1359                 /* See if we've already been here */
1360                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1361                         LDAPRequest *lp;
1362                         int looped = 0;
1363                         ber_len_t len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1364                         for ( lp = lr; lp; lp = lp->lr_parent ) {
1365                                 if ( lp->lr_conn == lc
1366                                         && len == lp->lr_dn.bv_len )
1367                                 {
1368                                         if ( len && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) )
1369                                                         continue;
1370                                         looped = 1;
1371                                         break;
1372                                 }
1373                         }
1374                         if ( looped ) {
1375                                 ldap_free_urllist( srv );
1376                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1377                                 rc = -1;
1378                                 continue;
1379                         }
1380                 }
1381
1382                 LDAP_NEXT_MSGID( ld, id );
1383                 ber = re_encode_request( ld, origreq->lr_ber,
1384                     id, sref, srv, &rinfo.ri_request );
1385
1386                 if ( ber == NULL ) {
1387                         return -1 ;
1388                 }
1389
1390                 /* copy the complete referral for rebind process */
1391                 rinfo.ri_url = LDAP_STRDUP( ref );
1392
1393                 rinfo.ri_msgid = origreq->lr_origid;
1394
1395 #ifdef LDAP_R_COMPILE
1396                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1397 #endif
1398                 rc = ldap_send_server_request( ld, ber, id,
1399                         lr, &srv, NULL, &rinfo );
1400 #ifdef LDAP_R_COMPILE
1401                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1402 #endif
1403
1404                 LDAP_FREE( rinfo.ri_url );
1405
1406                 if( rc >= 0 ) {
1407                         ++count;
1408                 } else {
1409                         Debug( LDAP_DEBUG_ANY,
1410                                 "Unable to chase referral \"%s\" (%d: %s)\n",
1411                                 ref, ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1412                         rc = ldap_append_referral( ld, &unfollowed, ref );
1413                 }
1414
1415                 ldap_free_urllist(srv);
1416         }
1417
1418         LDAP_FREE( *errstrp );
1419         *errstrp = unfollowed;
1420
1421         return(( rc == 0 ) ? count : rc );
1422 }
1423
1424
1425 int
1426 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
1427 {
1428         int     first;
1429
1430         if ( *referralsp == NULL ) {
1431                 first = 1;
1432                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
1433                     + 1 );
1434         } else {
1435                 first = 0;
1436                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
1437                     strlen( *referralsp ) + strlen( s ) + 2 );
1438         }
1439
1440         if ( *referralsp == NULL ) {
1441                 ld->ld_errno = LDAP_NO_MEMORY;
1442                 return( -1 );
1443         }
1444
1445         if ( first ) {
1446                 strcpy( *referralsp, LDAP_REF_STR );
1447         } else {
1448                 strcat( *referralsp, "\n" );
1449         }
1450         strcat( *referralsp, s );
1451
1452         return( 0 );
1453 }
1454
1455
1456
1457 static BerElement *
1458 re_encode_request( LDAP *ld,
1459         BerElement *origber,
1460         ber_int_t msgid,
1461         int sref,
1462         LDAPURLDesc *srv,
1463         int *type )
1464 {
1465         /*
1466          * XXX this routine knows way too much about how the lber library works!
1467          */
1468         ber_int_t       along;
1469         ber_tag_t       tag;
1470         ber_tag_t       rtag;
1471         ber_int_t       ver;
1472         ber_int_t       scope;
1473         int             rc;
1474         BerElement      tmpber, *ber;
1475         struct berval           dn;
1476
1477         Debug( LDAP_DEBUG_TRACE,
1478             "re_encode_request: new msgid %ld, new dn <%s>\n",
1479             (long) msgid,
1480                 ( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
1481
1482         tmpber = *origber;
1483
1484         /*
1485          * all LDAP requests are sequences that start with a message id.
1486          * For all except delete, this is followed by a sequence that is
1487          * tagged with the operation code.  For delete, the provided DN
1488          * is not wrapped by a sequence.
1489          */
1490         rtag = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
1491
1492         if ( rtag == LBER_ERROR ) {
1493                 ld->ld_errno = LDAP_DECODING_ERROR;
1494                 return( NULL );
1495         }
1496
1497         assert( tag != 0);
1498         if ( tag == LDAP_REQ_BIND ) {
1499                 /* bind requests have a version number before the DN & other stuff */
1500                 rtag = ber_scanf( &tmpber, "{im" /*}*/, &ver, &dn );
1501
1502         } else if ( tag == LDAP_REQ_DELETE ) {
1503                 /* delete requests don't have a DN wrapping sequence */
1504                 rtag = ber_scanf( &tmpber, "m", &dn );
1505
1506         } else if ( tag == LDAP_REQ_SEARCH ) {
1507                 /* search requests need to be re-scope-ed */
1508                 rtag = ber_scanf( &tmpber, "{me" /*"}"*/, &dn, &scope );
1509
1510                 if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
1511                         /* use the scope provided in reference */
1512                         scope = srv->lud_scope;
1513
1514                 } else if ( sref ) {
1515                         /* use scope implied by previous operation
1516                          *   base -> base
1517                          *   one -> base
1518                          *   subtree -> subtree
1519                          *   subordinate -> subtree
1520                          */
1521                         switch( scope ) {
1522                         default:
1523                         case LDAP_SCOPE_BASE:
1524                         case LDAP_SCOPE_ONELEVEL:
1525                                 scope = LDAP_SCOPE_BASE;
1526                                 break;
1527                         case LDAP_SCOPE_SUBTREE:
1528                         case LDAP_SCOPE_SUBORDINATE:
1529                                 scope = LDAP_SCOPE_SUBTREE;
1530                                 break;
1531                         }
1532                 }
1533
1534         } else {
1535                 rtag = ber_scanf( &tmpber, "{m" /*}*/, &dn );
1536         }
1537
1538         if( rtag == LBER_ERROR ) {
1539                 ld->ld_errno = LDAP_DECODING_ERROR;
1540                 return NULL;
1541         }
1542
1543         /* restore character zero'd out by ber_scanf*/
1544         dn.bv_val[dn.bv_len] = tmpber.ber_tag;
1545
1546         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1547                 return NULL;
1548         }
1549
1550         if ( srv->lud_dn ) {
1551                 ber_str2bv( srv->lud_dn, 0, 0, &dn );
1552         }
1553
1554         if ( tag == LDAP_REQ_BIND ) {
1555                 rc = ber_printf( ber, "{it{iO" /*}}*/, msgid, tag, ver, &dn );
1556         } else if ( tag == LDAP_REQ_DELETE ) {
1557                 rc = ber_printf( ber, "{itON}", msgid, tag, &dn );
1558         } else if ( tag == LDAP_REQ_SEARCH ) {
1559                 rc = ber_printf( ber, "{it{Oe" /*}}*/, msgid, tag, &dn, scope );
1560         } else {
1561                 rc = ber_printf( ber, "{it{O" /*}}*/, msgid, tag, &dn );
1562         }
1563
1564         if ( rc == -1 ) {
1565                 ld->ld_errno = LDAP_ENCODING_ERROR;
1566                 ber_free( ber, 1 );
1567                 return NULL;
1568         }
1569
1570         if ( tag != LDAP_REQ_DELETE && (
1571                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1572                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1573             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1574         {
1575                 ld->ld_errno = LDAP_ENCODING_ERROR;
1576                 ber_free( ber, 1 );
1577                 return NULL;
1578         }
1579
1580 #ifdef LDAP_DEBUG
1581         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1582                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1583                     0, 0, 0 );
1584                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1585         }
1586 #endif /* LDAP_DEBUG */
1587
1588         *type = tag;    /* return request type */
1589         return ber;
1590 }
1591
1592
1593 LDAPRequest *
1594 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1595 {
1596         LDAPRequest     *lr;
1597
1598 #ifdef LDAP_R_COMPILE
1599         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1600 #endif
1601         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1602                 if ( lr->lr_status == LDAP_REQST_COMPLETED ) {
1603                         continue;       /* Skip completed requests */
1604                 }
1605                 if ( msgid == lr->lr_msgid ) {
1606                         lr->lr_refcnt++;
1607                         break;
1608                 }
1609         }
1610 #ifdef LDAP_R_COMPILE
1611         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1612 #endif
1613
1614         return( lr );
1615 }
1616
1617 void
1618 ldap_return_request( LDAP *ld, LDAPRequest *lrx, int freeit )
1619 {
1620         LDAPRequest     *lr;
1621
1622 #ifdef LDAP_R_COMPILE
1623         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1624 #endif
1625         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1626                 if ( lr == lrx ) {
1627                         if ( lr->lr_refcnt > 0 ) {
1628                                 lr->lr_refcnt--;
1629
1630                         } else if ( lr->lr_refcnt < 0 ) {
1631                                 lr->lr_refcnt++;
1632                                 if ( lr->lr_refcnt == 0 ) {
1633                                         lr = NULL;
1634                                 }
1635                         }
1636                         break;
1637                 }
1638         }
1639         if ( lr == NULL ) {
1640                 ldap_free_request_int( ld, lrx );
1641
1642         } else if ( freeit ) {
1643                 ldap_free_request( ld, lrx );
1644         }
1645 #ifdef LDAP_R_COMPILE
1646         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1647 #endif
1648 }