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 1998-2006 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                         return 0;
 128                 }
 129                 if (msgtype != LDAP_REQ_ABANDON && msgtype != LDAP_REQ_SEARCH)
 130                         return LDAP_PARAM_ERROR;
 131         }
 132 #endif
 133 #ifdef LDAP_R_COMPILE
 134         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 135 #endif
 136         rc = ldap_send_server_request( ld, ber, msgid, NULL,
 137                 NULL, NULL, NULL );
 138 #ifdef LDAP_R_COMPILE
 139         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 140 #endif
 141         return(rc);
 142 }
 143
 144
 145 int
 146 ldap_int_flush_request(
 147         LDAP *ld,
 148         LDAPRequest *lr )
 149 {
 150         LDAPConn *lc = lr->lr_conn;
 151
 152         if ( ber_flush2( lc->lconn_sb, lr->lr_ber, LBER_FLUSH_FREE_NEVER ) != 0 ) {
 153                 if ( errno == EAGAIN ) {
 154                         /* need to continue write later */
 155                         lr->lr_status = LDAP_REQST_WRITING;
 156                         ldap_mark_select_write( ld, lc->lconn_sb );
 157                         ld->ld_errno = LDAP_BUSY;
 158                         return -2;
 159                 } else {
 160                         ld->ld_errno = LDAP_SERVER_DOWN;
 161                         ldap_free_request( ld, lr );
 162                         ldap_free_connection( ld, lc, 0, 0 );
 163                         return( -1 );
 164                 }
 165         } else {
 166                 if ( lr->lr_parent == NULL ) {
 167                         lr->lr_ber->ber_end = lr->lr_ber->ber_ptr;
 168                         lr->lr_ber->ber_ptr = lr->lr_ber->ber_buf;
 169                 }
 170                 lr->lr_status = LDAP_REQST_INPROGRESS;
 171
 172                 /* sent -- waiting for a response */
 173                 ldap_mark_select_read( ld, lc->lconn_sb );
 174         }
 175         return 0;
 176 }
 177
 178 int
 179 ldap_send_server_request(
 180         LDAP *ld,
 181         BerElement *ber,
 182         ber_int_t msgid,
 183         LDAPRequest *parentreq,
 184         LDAPURLDesc **srvlist,
 185         LDAPConn *lc,
 186         LDAPreqinfo *bind )
 187 {
 188         LDAPRequest     *lr;
 189         int             incparent, rc;
 190
 191         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 192
 193         incparent = 0;
 194         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 195
 196         if ( lc == NULL ) {
 197                 if ( srvlist == NULL ) {
 198                         lc = ld->ld_defconn;
 199                 } else {
 200                         lc = find_connection( ld, *srvlist, 1 );
 201                         if ( lc == NULL ) {
 202                                 if ( (bind != NULL) && (parentreq != NULL) ) {
 203                                         /* Remember the bind in the parent */
 204                                         incparent = 1;
 205                                         ++parentreq->lr_outrefcnt;
 206                                 }
 207                                 lc = ldap_new_connection( ld, srvlist, 0, 1, bind );
 208                         }
 209                 }
 210         }
 211
 212         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 213                 ber_free( ber, 1 );
 214                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 215                         ld->ld_errno = LDAP_SERVER_DOWN;
 216                 }
 217                 if ( incparent ) {
 218                         /* Forget about the bind */
 219                         --parentreq->lr_outrefcnt;
 220                 }
 221                 return( -1 );
 222         }
 223
 224         use_connection( ld, lc );
 225
 226         /* If we still have an incomplete write, try to finish it before
 227          * dealing with the new request. If we don't finish here, return
 228          * LDAP_BUSY and let the caller retry later. We only allow a single
 229          * request to be in WRITING state.
 230          */
 231         rc = 0;
 232         if ( ld->ld_requests &&
 233                 ld->ld_requests->lr_status == LDAP_REQST_WRITING &&
 234                 ldap_int_flush_request( ld, ld->ld_requests ) < 0 )
 235         {
 236                 rc = -1;
 237         }
 238         if ( rc ) return rc;
 239
 240         lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ) );
 241         if ( lr == NULL ) {
 242                 ld->ld_errno = LDAP_NO_MEMORY;
 243                 ldap_free_connection( ld, lc, 0, 0 );
 244                 ber_free( ber, 1 );
 245                 if ( incparent ) {
 246                         /* Forget about the bind */
 247                         --parentreq->lr_outrefcnt;
 248                 }
 249                 return( -1 );
 250         }
 251         lr->lr_msgid = msgid;
 252         lr->lr_status = LDAP_REQST_INPROGRESS;
 253         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 254         lr->lr_ber = ber;
 255         lr->lr_conn = lc;
 256         if ( parentreq != NULL ) {      /* sub-request */
 257                 if ( !incparent ) {
 258                         /* Increment if we didn't do it before the bind */
 259                         ++parentreq->lr_outrefcnt;
 260                 }
 261                 lr->lr_origid = parentreq->lr_origid;
 262                 lr->lr_parentcnt = ++parentreq->lr_parentcnt;
 263                 lr->lr_parent = parentreq;
 264                 lr->lr_refnext = parentreq->lr_child;
 265                 parentreq->lr_child = lr;
 266         } else {                        /* original request */
 267                 lr->lr_origid = lr->lr_msgid;
 268         }
 269
 270         /* Extract requestDN for future reference */
 271         {
 272                 BerElement tmpber = *ber;
 273                 ber_int_t       bint;
 274                 ber_tag_t       tag, rtag;
 275
 276                 ber_reset( &tmpber, 1 );
 277                 rtag = ber_scanf( &tmpber, "{it", /*}*/ &bint, &tag );
 278                 switch ( tag ) {
 279                 case LDAP_REQ_BIND:
 280                         rtag = ber_scanf( &tmpber, "{i" /*}*/, &bint );
 281                         break;
 282                 case LDAP_REQ_DELETE:
 283                         break;
 284                 default:
 285                         rtag = ber_scanf( &tmpber, "{" /*}*/ );
 286                 case LDAP_REQ_ABANDON:
 287                         break;
 288                 }
 289                 if ( tag != LDAP_REQ_ABANDON ) {
 290                         ber_skip_tag( &tmpber, &lr->lr_dn.bv_len );
 291                         lr->lr_dn.bv_val = tmpber.ber_ptr;
 292                 }
 293         }
 294
 295         lr->lr_prev = NULL;
 296         if (( lr->lr_next = ld->ld_requests ) != NULL ) {
 297                 lr->lr_next->lr_prev = lr;
 298         }
 299         ld->ld_requests = lr;
 300
 301         ld->ld_errno = LDAP_SUCCESS;
 302         if ( ldap_int_flush_request( ld, lr ) == -1 ) {
 303                 msgid = -1;
 304         }
 305
 306         return( msgid );
 307 }
 308
 309 LDAPConn *
 310 ldap_new_connection( LDAP *ld, LDAPURLDesc **srvlist, int use_ldsb,
 311         int connect, LDAPreqinfo *bind )
 312 {
 313         LDAPConn        *lc;
 314
 315         Debug( LDAP_DEBUG_TRACE, "ldap_new_connection %d %d %d\n",
 316                 use_ldsb, connect, (bind != NULL) );
 317         /*
 318          * make a new LDAP server connection
 319          * XXX open connection synchronously for now
 320          */
 321         lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ) );
 322         if ( lc == NULL ) {
 323                 ld->ld_errno = LDAP_NO_MEMORY;
 324                 return( NULL );
 325         }
 326
 327         if ( use_ldsb ) {
 328                 assert( ld->ld_sb != NULL );
 329                 lc->lconn_sb = ld->ld_sb;
 330
 331         } else {
 332                 lc->lconn_sb = ber_sockbuf_alloc();
 333                 if ( lc->lconn_sb == NULL ) {
 334                         LDAP_FREE( (char *)lc );
 335                         ld->ld_errno = LDAP_NO_MEMORY;
 336                         return( NULL );
 337                 }
 338         }
 339
 340         if ( connect ) {
 341                 LDAPURLDesc     **srvp, *srv = NULL;
 342
 343                 for ( srvp = srvlist; *srvp != NULL; srvp = &(*srvp)->lud_next ) {
 344                         if ( ldap_int_open_connection( ld, lc, *srvp, 0 ) != -1 )
 345                         {
 346                                 srv = *srvp;
 347
 348                                 if ( ld->ld_urllist_proc ) {
 349                                         ld->ld_urllist_proc( ld, srvlist, srvp, ld->ld_urllist_params );
 350                                 }
 351
 352                                 break;
 353                         }
 354                 }
 355
 356                 if ( srv == NULL ) {
 357                         if ( !use_ldsb ) {
 358                                 ber_sockbuf_free( lc->lconn_sb );
 359                         }
 360                         LDAP_FREE( (char *)lc );
 361                         ld->ld_errno = LDAP_SERVER_DOWN;
 362                         return( NULL );
 363                 }
 364
 365                 lc->lconn_server = ldap_url_dup( srv );
 366         }
 367
 368         lc->lconn_status = LDAP_CONNST_CONNECTED;
 369 #ifdef LDAP_R_COMPILE
 370         ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 371 #endif
 372         lc->lconn_next = ld->ld_conns;
 373         ld->ld_conns = lc;
 374 #ifdef LDAP_R_COMPILE
 375         ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 376 #endif
 377
 378         if ( bind != NULL ) {
 379                 int             err = 0;
 380                 LDAPConn        *savedefconn;
 381
 382                 /* Set flag to prevent additional referrals
 383                  * from being processed on this
 384                  * connection until the bind has completed
 385                  */
 386                 lc->lconn_rebind_inprogress = 1;
 387                 /* V3 rebind function */
 388                 if ( ld->ld_rebind_proc != NULL) {
 389                         LDAPURLDesc     *srvfunc;
 390
 391                         srvfunc = ldap_url_dup( *srvlist );
 392                         if ( srvfunc == NULL ) {
 393                                 ld->ld_errno = LDAP_NO_MEMORY;
 394                                 err = -1;
 395                         } else {
 396                                 savedefconn = ld->ld_defconn;
 397                                 ++lc->lconn_refcnt;     /* avoid premature free */
 398                                 ld->ld_defconn = lc;
 399
 400                                 Debug( LDAP_DEBUG_TRACE, "Call application rebind_proc\n", 0, 0, 0);
 401 #ifdef LDAP_R_COMPILE
 402                                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 403                                 ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 404 #endif
 405                                 err = (*ld->ld_rebind_proc)( ld,
 406                                         bind->ri_url, bind->ri_request, bind->ri_msgid,
 407                                         ld->ld_rebind_params );
 408 #ifdef LDAP_R_COMPILE
 409                                 ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 410                                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 411 #endif
 412
 413                                 ld->ld_defconn = savedefconn;
 414                                 --lc->lconn_refcnt;
 415
 416                                 if ( err != 0 ) {
 417                                         err = -1;
 418                                         ldap_free_connection( ld, lc, 1, 0 );
 419                                         lc = NULL;
 420                                 }
 421                                 ldap_free_urldesc( srvfunc );
 422                         }
 423
 424                 } else {
 425                         int             msgid, rc;
 426                         struct berval   passwd = BER_BVNULL;
 427
 428                         savedefconn = ld->ld_defconn;
 429                         ++lc->lconn_refcnt;     /* avoid premature free */
 430                         ld->ld_defconn = lc;
 431
 432                         Debug( LDAP_DEBUG_TRACE, "anonymous rebind via ldap_bind_s\n", 0, 0, 0);
 433 #ifdef LDAP_R_COMPILE
 434                         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 435                         ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 436 #endif
 437                         rc = ldap_sasl_bind( ld, "", LDAP_SASL_SIMPLE, &passwd,
 438                                 NULL, NULL, &msgid );
 439                         if ( rc != LDAP_SUCCESS ) {
 440                                 err = -1;
 441
 442                         } else {
 443                                 for ( err = 1; err > 0; ) {
 444                                         struct timeval  tv = { 0, 100000 };
 445                                         LDAPMessage     *res = NULL;
 446
 447                                         switch ( ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res ) ) {
 448                                         case -1:
 449                                                 err = -1;
 450                                                 break;
 451
 452                                         case 0:
 453 #ifdef LDAP_R_COMPILE
 454                                                 ldap_pvt_thread_yield();
 455 #endif
 456                                                 break;
 457
 458                                         case LDAP_RES_BIND:
 459                                                 rc = ldap_parse_result( ld, res, &err, NULL, NULL, NULL, NULL, 1 );
 460                                                 if ( rc != LDAP_SUCCESS ) {
 461                                                         err = -1;
 462
 463                                                 } else if ( err != LDAP_SUCCESS ) {
 464                                                         err = -1;
 465                                                 }
 466                                                 /* else err == LDAP_SUCCESS == 0 */
 467                                                 break;
 468
 469                                         default:
 470                                                 assert( 0 );
 471                                         }
 472                                 }
 473                         }
 474 #ifdef LDAP_R_COMPILE
 475                         ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 476                         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 477 #endif
 478                         ld->ld_defconn = savedefconn;
 479                         --lc->lconn_refcnt;
 480
 481                         if ( err != 0 ) {
 482                                 ldap_free_connection( ld, lc, 1, 0 );
 483                                 lc = NULL;
 484                         }
 485                 }
 486                 if ( lc != NULL )
 487                         lc->lconn_rebind_inprogress = 0;
 488         }
 489
 490         return( lc );
 491 }
 492
 493
 494 static LDAPConn *
 495 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 496 /*
 497  * return an existing connection (if any) to the server srv
 498  * if "any" is non-zero, check for any server in the "srv" chain
 499  */
 500 {
 501         LDAPConn        *lc;
 502         LDAPURLDesc     *lcu, *lsu;
 503         int lcu_port, lsu_port;
 504         int found = 0;
 505
 506 #ifdef LDAP_R_COMPILE
 507         ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 508 #endif
 509         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 510                 lcu = lc->lconn_server;
 511                 lcu_port = ldap_pvt_url_scheme_port( lcu->lud_scheme,
 512                         lcu->lud_port );
 513
 514                 for ( lsu = srv; lsu != NULL; lsu = lsu->lud_next ) {
 515                         lsu_port = ldap_pvt_url_scheme_port( lsu->lud_scheme,
 516                                 lsu->lud_port );
 517
 518                         if ( lsu_port == lcu_port
 519                                 && strcmp( lcu->lud_scheme, lsu->lud_scheme ) == 0
 520                                 && lcu->lud_host != NULL && *lcu->lud_host != '\0'
 521                                 && lsu->lud_host != NULL && *lsu->lud_host != '\0'
 522                                 && strcasecmp( lsu->lud_host, lcu->lud_host ) == 0 )
 523                         {
 524                                 found = 1;
 525                                 break;
 526                         }
 527
 528                         if ( !any ) break;
 529                 }
 530                 if ( found )
 531                         break;
 532         }
 533 #ifdef LDAP_R_COMPILE
 534         ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 535 #endif
 536         return lc;
 537 }
 538
 539
 540
 541 static void
 542 use_connection( LDAP *ld, LDAPConn *lc )
 543 {
 544         ++lc->lconn_refcnt;
 545         lc->lconn_lastused = time( NULL );
 546 }
 547
 548
 549 void
 550 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 551 {
 552         LDAPConn        *tmplc, *prevlc;
 553
 554         Debug( LDAP_DEBUG_TRACE,
 555                 "ldap_free_connection %d %d\n",
 556                 force, unbind, 0 );
 557
 558         if ( force || --lc->lconn_refcnt <= 0 ) {
 559                 /* remove from connections list first */
 560 #ifdef LDAP_R_COMPILE
 561                 ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 562 #endif
 563
 564                 for ( prevlc = NULL, tmplc = ld->ld_conns;
 565                         tmplc != NULL;
 566                         tmplc = tmplc->lconn_next )
 567                 {
 568                         if ( tmplc == lc ) {
 569                                 if ( prevlc == NULL ) {
 570                                     ld->ld_conns = tmplc->lconn_next;
 571                                 } else {
 572                                     prevlc->lconn_next = tmplc->lconn_next;
 573                                 }
 574                                 break;
 575                         }
 576                         prevlc = tmplc;
 577                 }
 578 #ifdef LDAP_R_COMPILE
 579                 ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 580 #endif
 581
 582                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 583                         ldap_mark_select_clear( ld, lc->lconn_sb );
 584                         if ( unbind ) {
 585                                 ldap_send_unbind( ld, lc->lconn_sb,
 586                                                 NULL, NULL );
 587                         }
 588                 }
 589
 590                 if ( lc->lconn_ber != NULL ) {
 591                         ber_free( lc->lconn_ber, 1 );
 592                 }
 593
 594                 ldap_int_sasl_close( ld, lc );
 595
 596                 ldap_free_urllist( lc->lconn_server );
 597 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 598                 if ( lc->lconn_krbinstance != NULL ) {
 599                         LDAP_FREE( lc->lconn_krbinstance );
 600                 }
 601 #endif
 602
 603                 /* FIXME: is this at all possible?
 604                  * ldap_ld_free() in unbind.c calls ldap_free_connection()
 605                  * with force == 1 __after__ explicitly calling
 606                  * ldap_free_request() on all requests */
 607                 if ( force ) {
 608                         LDAPRequest     *lr;
 609
 610                         for ( lr = ld->ld_requests; lr; ) {
 611                                 LDAPRequest     *lr_next = lr->lr_next;
 612
 613                                 if ( lr->lr_conn == lc ) {
 614                                         ldap_free_request_int( ld, lr );
 615                                 }
 616
 617                                 lr = lr_next;
 618                         }
 619                 }
 620
 621                 if ( lc->lconn_sb != ld->ld_sb ) {
 622                         ber_sockbuf_free( lc->lconn_sb );
 623                 }
 624
 625                 if ( lc->lconn_rebind_queue != NULL) {
 626                         int i;
 627                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 628                                 LDAP_VFREE( lc->lconn_rebind_queue[i] );
 629                         }
 630                         LDAP_FREE( lc->lconn_rebind_queue );
 631                 }
 632
 633                 LDAP_FREE( lc );
 634
 635                 Debug( LDAP_DEBUG_TRACE,
 636                         "ldap_free_connection: actually freed\n",
 637                         0, 0, 0 );
 638
 639         } else {
 640                 lc->lconn_lastused = time( NULL );
 641                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 642                                 lc->lconn_refcnt, 0, 0 );
 643         }
 644 }
 645
 646
 647 #ifdef LDAP_DEBUG
 648 void
 649 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 650 {
 651         LDAPConn        *lc;
 652         char            timebuf[32];
 653
 654         Debug( LDAP_DEBUG_TRACE, "** ld %p Connection%s:\n", (void *)ld, all ? "s" : "", 0 );
 655         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 656                 if ( lc->lconn_server != NULL ) {
 657                         Debug( LDAP_DEBUG_TRACE, "* host: %s  port: %d%s\n",
 658                                 ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 659                                 : lc->lconn_server->lud_host,
 660                                 lc->lconn_server->lud_port, ( lc->lconn_sb ==
 661                                 ld->ld_sb ) ? "  (default)" : "" );
 662                 }
 663                 Debug( LDAP_DEBUG_TRACE, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 664                         ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET )
 665                         ?  "NeedSocket" : ( lc->lconn_status == LDAP_CONNST_CONNECTING )
 666                         ? "Connecting" : "Connected", 0 );
 667                 Debug( LDAP_DEBUG_TRACE, "  last used: %s%s\n",
 668                         ldap_pvt_ctime( &lc->lconn_lastused, timebuf ),
 669                         lc->lconn_rebind_inprogress ? "  rebind in progress" : "", 0 );
 670                 if ( lc->lconn_rebind_inprogress ) {
 671                         if ( lc->lconn_rebind_queue != NULL) {
 672                                 int     i;
 673
 674                                 for ( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 675                                         int     j;
 676                                         for( j = 0; lc->lconn_rebind_queue[i][j] != 0; j++ ) {
 677                                                 Debug( LDAP_DEBUG_TRACE, "    queue %d entry %d - %s\n",
 678                                                         i, j, lc->lconn_rebind_queue[i][j] );
 679                                         }
 680                                 }
 681                         } else {
 682                                 Debug( LDAP_DEBUG_TRACE, "    queue is empty\n", 0, 0, 0 );
 683                         }
 684                 }
 685                 Debug( LDAP_DEBUG_TRACE, "\n", 0, 0, 0 );
 686                 if ( !all ) {
 687                         break;
 688                 }
 689         }
 690 }
 691
 692
 693 void
 694 ldap_dump_requests_and_responses( LDAP *ld )
 695 {
 696         LDAPRequest     *lr;
 697         LDAPMessage     *lm, *l;
 698         int             i;
 699
 700         Debug( LDAP_DEBUG_TRACE, "** ld %p Outstanding Requests:\n",
 701                 (void *)ld, 0, 0 );
 702         lr = ld->ld_requests;
 703         if ( lr == NULL ) {
 704                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 705         }
 706         for ( i = 0; lr != NULL; lr = lr->lr_next, i++ ) {
 707                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  origid %d, status %s\n",
 708                         lr->lr_msgid, lr->lr_origid,
 709                         ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 710                         ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 711                         ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 712                         ( lr->lr_status == LDAP_REQST_WRITING ) ? "Writing" :
 713                         ( lr->lr_status == LDAP_REQST_COMPLETED ) ? "RequestCompleted"
 714                                 : "InvalidStatus" );
 715                 Debug( LDAP_DEBUG_TRACE, "   outstanding referrals %d, parent count %d\n",
 716                         lr->lr_outrefcnt, lr->lr_parentcnt, 0 );
 717         }
 718         Debug( LDAP_DEBUG_TRACE, "  ld %p request count %d\n", (void *)ld, i, 0 );
 719         Debug( LDAP_DEBUG_TRACE, "** ld %p Response Queue:\n", (void *)ld, 0, 0 );
 720         if ( ( lm = ld->ld_responses ) == NULL ) {
 721                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 722         }
 723         for ( i = 0; lm != NULL; lm = lm->lm_next, i++ ) {
 724                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  type %lu\n",
 725                     lm->lm_msgid, (unsigned long)lm->lm_msgtype, 0 );
 726                 if ( ( l = lm->lm_chain ) != NULL ) {
 727                         Debug( LDAP_DEBUG_TRACE, "   chained responses:\n", 0, 0, 0 );
 728                         for ( ; l != NULL; l = l->lm_chain ) {
 729                                 Debug( LDAP_DEBUG_TRACE,
 730                                         "  * msgid %d,  type %lu\n",
 731                                         l->lm_msgid,
 732                                         (unsigned long)l->lm_msgtype, 0 );
 733                         }
 734                 }
 735         }
 736         Debug( LDAP_DEBUG_TRACE, "  ld %p response count %d\n", (void *)ld, i, 0 );
 737 }
 738 #endif /* LDAP_DEBUG */
 739
 740 static void
 741 ldap_free_request_int( LDAP *ld, LDAPRequest *lr )
 742 {
 743         if ( lr->lr_prev == NULL ) {
 744                 /* free'ing the first request? */
 745                 assert( ld->ld_requests == lr );
 746                 ld->ld_requests = lr->lr_next;
 747
 748         } else {
 749                 lr->lr_prev->lr_next = lr->lr_next;
 750         }
 751
 752         if ( lr->lr_next != NULL ) {
 753                 lr->lr_next->lr_prev = lr->lr_prev;
 754         }
 755
 756         if ( lr->lr_ber != NULL ) {
 757                 ber_free( lr->lr_ber, 1 );
 758                 lr->lr_ber = NULL;
 759         }
 760
 761         if ( lr->lr_res_error != NULL ) {
 762                 LDAP_FREE( lr->lr_res_error );
 763                 lr->lr_res_error = NULL;
 764         }
 765
 766         if ( lr->lr_res_matched != NULL ) {
 767                 LDAP_FREE( lr->lr_res_matched );
 768                 lr->lr_res_matched = NULL;
 769         }
 770
 771         LDAP_FREE( lr );
 772 }
 773
 774 void
 775 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 776 {
 777         LDAPRequest     **ttmplr;
 778 #ifdef LDAP_R_COMPILE
 779         LDAP_PVT_THREAD_ASSERT_MUTEX_OWNER( &ld->ld_req_mutex );
 780 #endif
 781
 782         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 783                 lr->lr_origid, lr->lr_msgid, 0 );
 784
 785         /* free all referrals (child requests) */
 786         while ( lr->lr_child )
 787                 ldap_free_request( ld, lr->lr_child );
 788
 789         if ( lr->lr_parent != NULL ) {
 790                 --lr->lr_parent->lr_outrefcnt;
 791                 for ( ttmplr = &lr->lr_parent->lr_child; *ttmplr && *ttmplr != lr; ttmplr = &(*ttmplr)->lr_refnext );
 792                 if ( *ttmplr == lr )
 793                         *ttmplr = lr->lr_refnext;
 794         }
 795         ldap_free_request_int( ld, lr );
 796 }
 797
 798 /*
 799  * call first time with *cntp = -1
 800  * when returns *cntp == -1, no referrals are left
 801  *
 802  * NOTE: may replace *refsp, or shuffle the contents
 803  * of the original array.
 804  */
 805 static int ldap_int_nextref(
 806         LDAP                    *ld,
 807         char                    ***refsp,
 808         int                     *cntp,
 809         void                    *params )
 810 {
 811         assert( refsp != NULL );
 812         assert( *refsp != NULL );
 813         assert( cntp != NULL );
 814
 815         if ( *cntp < -1 ) {
 816                 *cntp = -1;
 817                 return -1;
 818         }
 819
 820         (*cntp)++;
 821
 822         if ( (*refsp)[ *cntp ] == NULL ) {
 823                 *cntp = -1;
 824         }
 825
 826         return 0;
 827 }
 828
 829 /*
 830  * Chase v3 referrals
 831  *
 832  * Parameters:
 833  *  (IN) ld = LDAP connection handle
 834  *  (IN) lr = LDAP Request structure
 835  *  (IN) refs = array of pointers to referral strings that we will chase
 836  *              The array will be free'd by this function when no longer needed
 837  *  (IN) sref != 0 if following search reference
 838  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
 839  *  (OUT) hadrefp = 1 if sucessfully followed referral
 840  *
 841  * Return value - number of referrals followed
 842  */
 843 int
 844 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
 845 {
 846         char            *unfollowed;
 847         int              unfollowedcnt = 0;
 848         LDAPRequest     *origreq;
 849         LDAPURLDesc     *srv = NULL;
 850         BerElement      *ber;
 851         char            **refarray = NULL;
 852         LDAPConn        *lc;
 853         int                      rc, count, i, j, id;
 854         LDAPreqinfo  rinfo;
 855
 856         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 857         *hadrefp = 0;
 858
 859         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
 860
 861         unfollowed = NULL;
 862         rc = count = 0;
 863
 864         /* If no referrals in array, return */
 865         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
 866                 rc = 0;
 867                 goto done;
 868         }
 869
 870         /* Check for hop limit exceeded */
 871         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 872                 Debug( LDAP_DEBUG_ANY,
 873                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
 874                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
 875                 rc = -1;
 876                 goto done;
 877         }
 878
 879         /* find original request */
 880         for ( origreq = lr;
 881                 origreq->lr_parent != NULL;
 882                 origreq = origreq->lr_parent )
 883         {
 884                 /* empty */ ;
 885         }
 886
 887         refarray = refs;
 888         refs = NULL;
 889
 890         if ( ld->ld_nextref_proc == NULL ) {
 891                 ld->ld_nextref_proc = ldap_int_nextref;
 892         }
 893
 894         /* parse out & follow referrals */
 895         i = -1;
 896         for ( ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params );
 897                         i != -1;
 898                         ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params ) )
 899         {
 900
 901                 /* Parse the referral URL */
 902                 rc = ldap_url_parse_ext( refarray[i], &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
 903                 if ( rc != LDAP_URL_SUCCESS ) {
 904                         /* ldap_url_parse_ext() returns LDAP_URL_* errors
 905                          * which do not map on API errors */
 906                         ld->ld_errno = LDAP_PARAM_ERROR;
 907                         rc = -1;
 908                         goto done;
 909                 }
 910
 911                 if( srv->lud_crit_exts ) {
 912                         /* we do not support any extensions */
 913                         ld->ld_errno = LDAP_NOT_SUPPORTED;
 914                         rc = -1;
 915                         goto done;
 916                 }
 917
 918                 /* check connection for re-bind in progress */
 919                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
 920                         /* See if we've already requested this DN with this conn */
 921                         LDAPRequest *lp;
 922                         int looped = 0;
 923                         int len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
 924                         for ( lp = origreq; lp; ) {
 925                                 if ( lp->lr_conn == lc
 926                                         && len == lp->lr_dn.bv_len
 927                                         && len
 928                                         && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) == 0 )
 929                                 {
 930                                         looped = 1;
 931                                         break;
 932                                 }
 933                                 if ( lp == origreq ) {
 934                                         lp = lp->lr_child;
 935                                 } else {
 936                                         lp = lr->lr_refnext;
 937                                 }
 938                         }
 939                         if ( looped ) {
 940                                 ldap_free_urllist( srv );
 941                                 srv = NULL;
 942                                 ld->ld_errno = LDAP_CLIENT_LOOP;
 943                                 rc = -1;
 944                                 continue;
 945                         }
 946
 947                         if ( lc->lconn_rebind_inprogress ) {
 948                                 /* We are already chasing a referral or search reference and a
 949                                  * bind on that connection is in progress.  We must queue
 950                                  * referrals on that connection, so we don't get a request
 951                                  * going out before the bind operation completes. This happens
 952                                  * if two search references come in one behind the other
 953                                  * for the same server with different contexts.
 954                                  */
 955                                 Debug( LDAP_DEBUG_TRACE,
 956                                         "ldap_chase_v3referrals: queue referral \"%s\"\n",
 957                                         refarray[i], 0, 0);
 958                                 if( lc->lconn_rebind_queue == NULL ) {
 959                                         /* Create a referral list */
 960                                         lc->lconn_rebind_queue =
 961                                                 (char ***) LDAP_MALLOC( sizeof(void *) * 2);
 962
 963                                         if( lc->lconn_rebind_queue == NULL) {
 964                                                 ld->ld_errno = LDAP_NO_MEMORY;
 965                                                 rc = -1;
 966                                                 goto done;
 967                                         }
 968
 969                                         lc->lconn_rebind_queue[0] = refarray;
 970                                         lc->lconn_rebind_queue[1] = NULL;
 971                                         refarray = NULL;
 972
 973                                 } else {
 974                                         /* Count how many referral arrays we already have */
 975                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 976                                                 /* empty */;
 977                                         }
 978
 979                                         /* Add the new referral to the list */
 980                                         lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
 981                                                 lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
 982
 983                                         if( lc->lconn_rebind_queue == NULL ) {
 984                                                 ld->ld_errno = LDAP_NO_MEMORY;
 985                                                 rc = -1;
 986                                                 goto done;
 987                                         }
 988                                         lc->lconn_rebind_queue[j] = refarray;
 989                                         lc->lconn_rebind_queue[j+1] = NULL;
 990                                         refarray = NULL;
 991                                 }
 992
 993                                 /* We have queued the referral/reference, now just return */
 994                                 rc = 0;
 995                                 *hadrefp = 1;
 996                                 count = 1; /* Pretend we already followed referral */
 997                                 goto done;
 998                         }
 999                 }
1000                 /* Re-encode the request with the new starting point of the search.
1001                  * Note: In the future we also need to replace the filter if one
1002                  * was provided with the search reference
1003                  */
1004
1005                 /* For references we don't want old dn if new dn empty */
1006                 if ( sref && srv->lud_dn == NULL ) {
1007                         srv->lud_dn = LDAP_STRDUP( "" );
1008                 }
1009
1010                 LDAP_NEXT_MSGID( ld, id );
1011                 ber = re_encode_request( ld, origreq->lr_ber, id,
1012                         sref, srv, &rinfo.ri_request );
1013
1014                 if( ber == NULL ) {
1015                         ld->ld_errno = LDAP_ENCODING_ERROR;
1016                         rc = -1;
1017                         goto done;
1018                 }
1019
1020                 Debug( LDAP_DEBUG_TRACE,
1021                         "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
1022                         lr->lr_msgid, refarray[i], 0);
1023
1024                 /* Send the new request to the server - may require a bind */
1025                 rinfo.ri_msgid = origreq->lr_origid;
1026                 rinfo.ri_url = refarray[i];
1027 #ifdef LDAP_R_COMPILE
1028                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1029 #endif
1030                 rc = ldap_send_server_request( ld, ber, id,
1031                         origreq, &srv, NULL, &rinfo );
1032 #ifdef LDAP_R_COMPILE
1033                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1034 #endif
1035                 if ( rc < 0 ) {
1036                         /* Failure, try next referral in the list */
1037                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%d: %s)\n",
1038                                 refarray[i], ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1039                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i] );
1040                         ldap_free_urllist( srv );
1041                         srv = NULL;
1042                         ld->ld_errno = LDAP_REFERRAL;
1043                 } else {
1044                         /* Success, no need to try this referral list further */
1045                         rc = 0;
1046                         ++count;
1047                         *hadrefp = 1;
1048
1049                         /* check if there is a queue of referrals that came in during bind */
1050                         if ( lc == NULL) {
1051                                 lc = find_connection( ld, srv, 1 );
1052                                 if ( lc == NULL ) {
1053                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
1054                                         rc = -1;
1055                                         goto done;
1056                                 }
1057                         }
1058
1059                         if ( lc->lconn_rebind_queue != NULL ) {
1060                                 /* Release resources of previous list */
1061                                 LDAP_VFREE( refarray );
1062                                 refarray = NULL;
1063                                 ldap_free_urllist( srv );
1064                                 srv = NULL;
1065
1066                                 /* Pull entries off end of queue so list always null terminated */
1067                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++ )
1068                                         ;
1069                                 refarray = lc->lconn_rebind_queue[j - 1];
1070                                 lc->lconn_rebind_queue[j-1] = NULL;
1071                                 /* we pulled off last entry from queue, free queue */
1072                                 if ( j == 1 ) {
1073                                         LDAP_FREE( lc->lconn_rebind_queue );
1074                                         lc->lconn_rebind_queue = NULL;
1075                                 }
1076                                 /* restart the loop the with new referral list */
1077                                 i = -1;
1078                                 continue;
1079                         }
1080                         break; /* referral followed, break out of for loop */
1081                 }
1082         } /* end for loop */
1083 done:
1084         LDAP_VFREE( refarray );
1085         ldap_free_urllist( srv );
1086         LDAP_FREE( *errstrp );
1087
1088         if( rc == 0 ) {
1089                 *errstrp = NULL;
1090                 LDAP_FREE( unfollowed );
1091                 return count;
1092         } else {
1093                 *errstrp = unfollowed;
1094                 return rc;
1095         }
1096 }
1097
1098 /*
1099  * XXX merging of errors in this routine needs to be improved
1100  */
1101 int
1102 ldap_chase_referrals( LDAP *ld,
1103         LDAPRequest *lr,
1104         char **errstrp,
1105         int sref,
1106         int *hadrefp )
1107 {
1108         int             rc, count, id;
1109         unsigned        len;
1110         char            *p, *ref, *unfollowed;
1111         LDAPRequest     *origreq;
1112         LDAPURLDesc     *srv;
1113         BerElement      *ber;
1114         LDAPreqinfo  rinfo;
1115         LDAPConn        *lc;
1116
1117         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
1118
1119         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
1120         *hadrefp = 0;
1121
1122         if ( *errstrp == NULL ) {
1123                 return( 0 );
1124         }
1125
1126         len = strlen( *errstrp );
1127         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
1128                 if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
1129                         *p = '\0';
1130                         p += LDAP_REF_STR_LEN;
1131                         break;
1132                 }
1133         }
1134
1135         if ( len < LDAP_REF_STR_LEN ) {
1136                 return( 0 );
1137         }
1138
1139         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
1140                 Debug( LDAP_DEBUG_ANY,
1141                     "more than %d referral hops (dropping)\n",
1142                     ld->ld_refhoplimit, 0, 0 );
1143                     /* XXX report as error in ld->ld_errno? */
1144                     return( 0 );
1145         }
1146
1147         /* find original request */
1148         for ( origreq = lr; origreq->lr_parent != NULL;
1149              origreq = origreq->lr_parent ) {
1150                 /* empty */;
1151         }
1152
1153         unfollowed = NULL;
1154         rc = count = 0;
1155
1156         /* parse out & follow referrals */
1157         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
1158                 p = strchr( ref, '\n' );
1159                 if ( p != NULL ) {
1160                         *p++ = '\0';
1161                 }
1162
1163                 rc = ldap_url_parse_ext( ref, &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
1164                 if ( rc != LDAP_URL_SUCCESS ) {
1165                         Debug( LDAP_DEBUG_TRACE,
1166                                 "ignoring %s referral <%s>\n",
1167                                 ref, rc == LDAP_URL_ERR_BADSCHEME ? "unknown" : "incorrect", 0 );
1168                         rc = ldap_append_referral( ld, &unfollowed, ref );
1169                         *hadrefp = 1;
1170                         continue;
1171                 }
1172
1173                 Debug( LDAP_DEBUG_TRACE,
1174                     "chasing LDAP referral: <%s>\n", ref, 0, 0 );
1175
1176                 *hadrefp = 1;
1177
1178                 /* See if we've already been here */
1179                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1180                         LDAPRequest *lp;
1181                         int looped = 0;
1182                         int len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1183                         for ( lp = lr; lp; lp = lp->lr_parent ) {
1184                                 if ( lp->lr_conn == lc
1185                                         && len == lp->lr_dn.bv_len )
1186                                 {
1187                                         if ( len && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) )
1188                                                         continue;
1189                                         looped = 1;
1190                                         break;
1191                                 }
1192                         }
1193                         if ( looped ) {
1194                                 ldap_free_urllist(srv);
1195                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1196                                 rc = -1;
1197                                 continue;
1198                         }
1199                 }
1200
1201                 LDAP_NEXT_MSGID( ld, id );
1202                 ber = re_encode_request( ld, origreq->lr_ber,
1203                     id, sref, srv, &rinfo.ri_request );
1204
1205                 if ( ber == NULL ) {
1206                         return -1 ;
1207                 }
1208
1209                 /* copy the complete referral for rebind process */
1210                 rinfo.ri_url = LDAP_STRDUP( ref );
1211
1212                 rinfo.ri_msgid = origreq->lr_origid;
1213
1214 #ifdef LDAP_R_COMPILE
1215                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1216 #endif
1217                 rc = ldap_send_server_request( ld, ber, id,
1218                         lr, &srv, NULL, &rinfo );
1219 #ifdef LDAP_R_COMPILE
1220                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1221 #endif
1222
1223                 LDAP_FREE( rinfo.ri_url );
1224
1225                 if( rc >= 0 ) {
1226                         ++count;
1227                 } else {
1228                         Debug( LDAP_DEBUG_ANY,
1229                                 "Unable to chase referral \"%s\" (%d: %s)\n",
1230                                 ref, ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1231                         rc = ldap_append_referral( ld, &unfollowed, ref );
1232                 }
1233
1234                 ldap_free_urllist(srv);
1235         }
1236
1237         LDAP_FREE( *errstrp );
1238         *errstrp = unfollowed;
1239
1240         return(( rc == 0 ) ? count : rc );
1241 }
1242
1243
1244 int
1245 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
1246 {
1247         int     first;
1248
1249         if ( *referralsp == NULL ) {
1250                 first = 1;
1251                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
1252                     + 1 );
1253         } else {
1254                 first = 0;
1255                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
1256                     strlen( *referralsp ) + strlen( s ) + 2 );
1257         }
1258
1259         if ( *referralsp == NULL ) {
1260                 ld->ld_errno = LDAP_NO_MEMORY;
1261                 return( -1 );
1262         }
1263
1264         if ( first ) {
1265                 strcpy( *referralsp, LDAP_REF_STR );
1266         } else {
1267                 strcat( *referralsp, "\n" );
1268         }
1269         strcat( *referralsp, s );
1270
1271         return( 0 );
1272 }
1273
1274
1275
1276 static BerElement *
1277 re_encode_request( LDAP *ld,
1278         BerElement *origber,
1279         ber_int_t msgid,
1280         int sref,
1281         LDAPURLDesc *srv,
1282         int *type )
1283 {
1284         /*
1285          * XXX this routine knows way too much about how the lber library works!
1286          */
1287         ber_int_t       along;
1288         ber_tag_t       tag;
1289         ber_tag_t       rtag;
1290         ber_int_t       ver;
1291         ber_int_t       scope;
1292         int             rc;
1293         BerElement      tmpber, *ber;
1294         struct berval           dn;
1295
1296         Debug( LDAP_DEBUG_TRACE,
1297             "re_encode_request: new msgid %ld, new dn <%s>\n",
1298             (long) msgid,
1299                 ( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
1300
1301         tmpber = *origber;
1302
1303         /*
1304          * all LDAP requests are sequences that start with a message id.
1305          * For all except delete, this is followed by a sequence that is
1306          * tagged with the operation code.  For delete, the provided DN
1307          * is not wrapped by a sequence.
1308          */
1309         rtag = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
1310
1311         if ( rtag == LBER_ERROR ) {
1312                 ld->ld_errno = LDAP_DECODING_ERROR;
1313                 return( NULL );
1314         }
1315
1316         assert( tag != 0);
1317         if ( tag == LDAP_REQ_BIND ) {
1318                 /* bind requests have a version number before the DN & other stuff */
1319                 rtag = ber_scanf( &tmpber, "{im" /*}*/, &ver, &dn );
1320
1321         } else if ( tag == LDAP_REQ_DELETE ) {
1322                 /* delete requests don't have a DN wrapping sequence */
1323                 rtag = ber_scanf( &tmpber, "m", &dn );
1324
1325         } else if ( tag == LDAP_REQ_SEARCH ) {
1326                 /* search requests need to be re-scope-ed */
1327                 rtag = ber_scanf( &tmpber, "{me" /*"}"*/, &dn, &scope );
1328
1329                 if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
1330                         /* use the scope provided in reference */
1331                         scope = srv->lud_scope;
1332
1333                 } else if ( sref ) {
1334                         /* use scope implied by previous operation
1335                          *   base -> base
1336                          *   one -> base
1337                          *   subtree -> subtree
1338                          *   subordinate -> subtree
1339                          */
1340                         switch( scope ) {
1341                         default:
1342                         case LDAP_SCOPE_BASE:
1343                         case LDAP_SCOPE_ONELEVEL:
1344                                 scope = LDAP_SCOPE_BASE;
1345                                 break;
1346                         case LDAP_SCOPE_SUBTREE:
1347                         case LDAP_SCOPE_SUBORDINATE:
1348                                 scope = LDAP_SCOPE_SUBTREE;
1349                                 break;
1350                         }
1351                 }
1352
1353         } else {
1354                 rtag = ber_scanf( &tmpber, "{m" /*}*/, &dn );
1355         }
1356
1357         if( rtag == LBER_ERROR ) {
1358                 ld->ld_errno = LDAP_DECODING_ERROR;
1359                 return NULL;
1360         }
1361
1362         /* restore character zero'd out by ber_scanf*/
1363         dn.bv_val[dn.bv_len] = tmpber.ber_tag;
1364
1365         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1366                 return NULL;
1367         }
1368
1369         if ( srv->lud_dn ) {
1370                 ber_str2bv( srv->lud_dn, 0, 0, &dn );
1371         }
1372
1373         if ( tag == LDAP_REQ_BIND ) {
1374                 rc = ber_printf( ber, "{it{iO" /*}}*/, msgid, tag, ver, &dn );
1375         } else if ( tag == LDAP_REQ_DELETE ) {
1376                 rc = ber_printf( ber, "{itON}", msgid, tag, &dn );
1377         } else if ( tag == LDAP_REQ_SEARCH ) {
1378                 rc = ber_printf( ber, "{it{Oe" /*}}*/, msgid, tag, &dn, scope );
1379         } else {
1380                 rc = ber_printf( ber, "{it{O" /*}}*/, msgid, tag, &dn );
1381         }
1382
1383         if ( rc == -1 ) {
1384                 ld->ld_errno = LDAP_ENCODING_ERROR;
1385                 ber_free( ber, 1 );
1386                 return NULL;
1387         }
1388
1389         if ( tag != LDAP_REQ_DELETE && (
1390                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1391                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1392             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1393         {
1394                 ld->ld_errno = LDAP_ENCODING_ERROR;
1395                 ber_free( ber, 1 );
1396                 return NULL;
1397         }
1398
1399 #ifdef LDAP_DEBUG
1400         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1401                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1402                     0, 0, 0 );
1403                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1404         }
1405 #endif /* LDAP_DEBUG */
1406
1407         *type = tag;    /* return request type */
1408         return ber;
1409 }
1410
1411
1412 LDAPRequest *
1413 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1414 {
1415         LDAPRequest     *lr;
1416
1417 #ifdef LDAP_R_COMPILE
1418         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1419 #endif
1420         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1421                 if ( lr->lr_status == LDAP_REQST_COMPLETED ) {
1422                         continue;       /* Skip completed requests */
1423                 }
1424                 if ( msgid == lr->lr_msgid ) {
1425                         break;
1426                 }
1427         }
1428 #ifdef LDAP_R_COMPILE
1429         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1430 #endif
1431
1432         return( lr );
1433 }
1434
1435