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

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6 /*  Portions
   7  *  Copyright (c) 1995 Regents of the University of Michigan.
   8  *  All rights reserved.
   9  */
  10 /*---
  11  * This notice applies to changes, created by or for Novell, Inc.,
  12  * to preexisting works for which notices appear elsewhere in this file.
  13  *
  14  * Copyright (C) 1999, 2000 Novell, Inc. All Rights Reserved.
  15  *
  16  * THIS WORK IS SUBJECT TO U.S. AND INTERNATIONAL COPYRIGHT LAWS AND TREATIES.
  17  * USE, MODIFICATION, AND REDISTRIBUTION OF THIS WORK IS SUBJECT TO VERSION
  18  * 2.0.1 OF THE OPENLDAP PUBLIC LICENSE, A COPY OF WHICH IS AVAILABLE AT
  19  * HTTP://WWW.OPENLDAP.ORG/LICENSE.HTML OR IN THE FILE "LICENSE" IN THE
  20  * TOP-LEVEL DIRECTORY OF THE DISTRIBUTION. ANY USE OR EXPLOITATION OF THIS
  21  * WORK OTHER THAN AS AUTHORIZED IN VERSION 2.0.1 OF THE OPENLDAP PUBLIC
  22  * LICENSE, OR OTHER PRIOR WRITTEN CONSENT FROM NOVELL, COULD SUBJECT THE
  23  * PERPETRATOR TO CRIMINAL AND CIVIL LIABILITY.
  24  *---
  25  * Modification to OpenLDAP source by Novell, Inc.
  26  * April 2000 sfs  Added code to chase V3 referrals
  27  *  request.c - sending of ldap requests; handling of referrals
  28  */
  29
  30 #include "portable.h"
  31
  32 #include <stdio.h>
  33
  34 #include <ac/stdlib.h>
  35
  36 #include <ac/errno.h>
  37 #include <ac/socket.h>
  38 #include <ac/string.h>
  39 #include <ac/time.h>
  40 #include <ac/unistd.h>
  41
  42 #include "ldap-int.h"
  43 #include "lber.h"
  44
  45 static LDAPConn *find_connection LDAP_P(( LDAP *ld, LDAPURLDesc *srv, int any ));
  46 static void use_connection LDAP_P(( LDAP *ld, LDAPConn *lc ));
  47
  48 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
  49 static LDAPURLDesc *dn2servers LDAP_P(( LDAP *ld, const char *dn ));
  50 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
  51
  52 static BerElement *re_encode_request LDAP_P((
  53         LDAP *ld,
  54         BerElement *origber,
  55     ber_int_t msgid,
  56         char **dnp,
  57         int      *type));
  58
  59
  60 BerElement *
  61 ldap_alloc_ber_with_options( LDAP *ld )
  62 {
  63         BerElement      *ber;
  64
  65     if (( ber = ber_alloc_t( ld->ld_lberoptions )) == NULL ) {
  66                 ld->ld_errno = LDAP_NO_MEMORY;
  67 #ifdef STR_TRANSLATION
  68         } else {
  69                 ldap_set_ber_options( ld, ber );
  70 #endif /* STR_TRANSLATION */
  71         }
  72
  73         return( ber );
  74 }
  75
  76
  77 void
  78 ldap_set_ber_options( LDAP *ld, BerElement *ber )
  79 {
  80         ber->ber_options = ld->ld_lberoptions;
  81 #ifdef STR_TRANSLATION
  82         if (( ld->ld_lberoptions & LBER_TRANSLATE_STRINGS ) != 0 ) {
  83                 ber_set_string_translators( ber,
  84                     ld->ld_lber_encode_translate_proc,
  85                     ld->ld_lber_decode_translate_proc );
  86         }
  87 #endif /* STR_TRANSLATION */
  88 }
  89
  90
  91 ber_int_t
  92 ldap_send_initial_request(
  93         LDAP *ld,
  94         ber_tag_t msgtype,
  95         const char *dn,
  96         BerElement *ber )
  97 {
  98         LDAPURLDesc     *servers;
  99         int rc;
 100
 101         Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
 102
 103         if ( ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, NULL ) == -1 ) {
 104                 /* not connected yet */
 105                 int rc = ldap_open_defconn( ld );
 106
 107                 if( rc < 0 ) {
 108                         ber_free( ber, 1 );
 109                         return( -1 );
 110                 }
 111
 112                 Debug( LDAP_DEBUG_TRACE,
 113                         "ldap_delayed_open successful, ld_host is %s\n",
 114                         ( ld->ld_host == NULL ) ? "(null)" : ld->ld_host, 0, 0 );
 115         }
 116
 117 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 118         if ( LDAP_BOOL_GET(&ld->ld_options, LDAP_BOOL_DNS )
 119                 && ldap_is_dns_dn( dn ) )
 120         {
 121                 if (( servers = dn2servers( ld, dn )) == NULL ) {
 122                         ber_free( ber, 1 );
 123                         return( -1 );
 124                 }
 125
 126 #ifdef LDAP_DEBUG
 127                 if ( ldap_debug & LDAP_DEBUG_TRACE ) {
 128                         LDAPURLDesc     *srv;
 129
 130                         for (   srv = servers;
 131                                         srv != NULL;
 132                                 srv = srv->lud_next )
 133                         {
 134                                 fprintf( stderr,
 135                                     "LDAP server %s:  dn %s, port %d\n",
 136                                     srv->lud_host, ( srv->lud_dn == NULL ) ?
 137                                     "(default)" : srv->lud_dn,
 138                                     srv->lud_port );
 139                         }
 140                 }
 141 #endif /* LDAP_DEBUG */
 142         } else
 143 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 144         {
 145                 /*
 146                  * use of DNS is turned off or this is an X.500 DN...
 147                  * use our default connection
 148                  */
 149                 servers = NULL;
 150         }
 151
 152         rc = ldap_send_server_request( ld, ber, ld->ld_msgid, NULL,
 153                                                                         servers, NULL, NULL );
 154         if (servers)
 155                 ldap_free_urllist(servers);
 156         return(rc);
 157 }
 158
 159
 160
 161 int
 162 ldap_send_server_request(
 163         LDAP *ld,
 164         BerElement *ber,
 165         ber_int_t msgid,
 166         LDAPRequest *parentreq,
 167         LDAPURLDesc *srvlist,
 168         LDAPConn *lc,
 169         LDAPreqinfo *bind )
 170 {
 171         LDAPRequest     *lr;
 172         int incparent;
 173
 174         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 175
 176         incparent = 0;
 177         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 178
 179         if ( lc == NULL ) {
 180                 if ( srvlist == NULL ) {
 181                         lc = ld->ld_defconn;
 182                 } else {
 183                         if (( lc = find_connection( ld, srvlist, 1 )) ==
 184                             NULL ) {
 185                                 if ( (bind != NULL) && (parentreq != NULL) ) {
 186                                         /* Remember the bind in the parent */
 187                                         incparent = 1;
 188                                         ++parentreq->lr_outrefcnt;
 189                                 }
 190                                 lc = ldap_new_connection( ld, srvlist, 0, 1, bind );
 191                         }
 192                 }
 193         }
 194
 195         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 196                 ber_free( ber, 1 );
 197                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 198                         ld->ld_errno = LDAP_SERVER_DOWN;
 199                 }
 200                 if ( incparent ) {
 201                         /* Forget about the bind */
 202                         --parentreq->lr_outrefcnt;
 203                 }
 204                 return( -1 );
 205         }
 206
 207         use_connection( ld, lc );
 208         if (( lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ))) ==
 209             NULL ) {
 210                 ld->ld_errno = LDAP_NO_MEMORY;
 211                 ldap_free_connection( ld, lc, 0, 0 );
 212                 ber_free( ber, 1 );
 213                 if ( incparent ) {
 214                         /* Forget about the bind */
 215                         --parentreq->lr_outrefcnt;
 216                 }
 217                 return( -1 );
 218         }
 219         lr->lr_msgid = msgid;
 220         lr->lr_status = LDAP_REQST_INPROGRESS;
 221         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 222         lr->lr_ber = ber;
 223         lr->lr_conn = lc;
 224         if ( parentreq != NULL ) {      /* sub-request */
 225                 if ( !incparent ) {
 226                         /* Increment if we didn't do it before the bind */
 227                         ++parentreq->lr_outrefcnt;
 228                 }
 229                 lr->lr_origid = parentreq->lr_origid;
 230                 lr->lr_parentcnt = parentreq->lr_parentcnt + 1;
 231                 lr->lr_parent = parentreq;
 232                 lr->lr_refnext = parentreq->lr_refnext;
 233                 parentreq->lr_refnext = lr;
 234         } else {                        /* original request */
 235                 lr->lr_origid = lr->lr_msgid;
 236         }
 237
 238         if (( lr->lr_next = ld->ld_requests ) != NULL ) {
 239                 lr->lr_next->lr_prev = lr;
 240         }
 241         ld->ld_requests = lr;
 242         lr->lr_prev = NULL;
 243
 244         if ( ber_flush( lc->lconn_sb, ber, 0 ) != 0 ) {
 245 #ifdef notyet
 246                 if ( errno == EWOULDBLOCK ) {
 247                         /* need to continue write later */
 248                         lr->lr_status = LDAP_REQST_WRITING;
 249                         ldap_mark_select_write( ld, lc->lconn_sb );
 250                 } else {
 251 #else /* notyet */
 252                         ld->ld_errno = LDAP_SERVER_DOWN;
 253                         ldap_free_request( ld, lr );
 254                         ldap_free_connection( ld, lc, 0, 0 );
 255                         return( -1 );
 256 #endif /* notyet */
 257 #ifdef notyet
 258                 }
 259 #endif /* notyet */
 260         } else {
 261                 if ( parentreq == NULL ) {
 262                         ber->ber_end = ber->ber_ptr;
 263                         ber->ber_ptr = ber->ber_buf;
 264                 }
 265
 266                 /* sent -- waiting for a response */
 267                 ldap_mark_select_read( ld, lc->lconn_sb );
 268         }
 269
 270         ld->ld_errno = LDAP_SUCCESS;
 271         return( msgid );
 272 }
 273
 274 LDAPConn *
 275 ldap_new_connection( LDAP *ld, LDAPURLDesc *srvlist, int use_ldsb,
 276         int connect, LDAPreqinfo *bind )
 277 {
 278         LDAPConn        *lc;
 279         LDAPURLDesc     *srv;
 280         Sockbuf         *sb;
 281
 282         Debug( LDAP_DEBUG_TRACE, "ldap_new_connection\n", 0, 0, 0 );
 283         /*
 284          * make a new LDAP server connection
 285          * XXX open connection synchronously for now
 286          */
 287         if (( lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ))) == NULL ||
 288             ( !use_ldsb && ( (sb = ber_sockbuf_alloc()) == NULL ))) {
 289                 if ( lc != NULL ) {
 290                         LDAP_FREE( (char *)lc );
 291                 }
 292                 ld->ld_errno = LDAP_NO_MEMORY;
 293                 return( NULL );
 294         }
 295
 296         lc->lconn_sb = ( use_ldsb ) ? ld->ld_sb : sb;
 297
 298         if ( connect ) {
 299                 for ( srv = srvlist; srv != NULL; srv = srv->lud_next ) {
 300                         if ( open_ldap_connection( ld, lc->lconn_sb,
 301                                         srv, &lc->lconn_krbinstance, 0 ) != -1 )
 302                         {
 303                                 break;
 304                         }
 305                 }
 306
 307                 if ( srv == NULL ) {
 308                         if ( !use_ldsb ) {
 309                                 ber_sockbuf_free( lc->lconn_sb );
 310                         }
 311                     LDAP_FREE( (char *)lc );
 312                     ld->ld_errno = LDAP_SERVER_DOWN;
 313                     return( NULL );
 314                 }
 315
 316                 lc->lconn_server = ldap_url_dup(srv);
 317         }
 318
 319         lc->lconn_status = LDAP_CONNST_CONNECTED;
 320         lc->lconn_next = ld->ld_conns;
 321         ld->ld_conns = lc;
 322
 323         /*
 324          * XXX for now, we always do a synchronous bind.  This will have
 325          * to change in the long run...
 326          */
 327         if ( bind != NULL) {
 328                 int             err = 0;
 329                 LDAPConn        *savedefconn;
 330
 331                 /* Set flag to prevent additional referrals from being processed on this
 332                  * connection until the bind has completed
 333                  */
 334                 lc->lconn_rebind_inprogress = 1;
 335                 /* V3 rebind function */
 336                 if ( ld->ld_rebindproc != NULL) {
 337                         LDAPURLDesc     *srvfunc;
 338                         if( ( srvfunc = ldap_url_dup( srvlist)) == NULL) {
 339                                 ld->ld_errno = LDAP_NO_MEMORY;
 340                                 err = -1;
 341                         } else {
 342                                 savedefconn = ld->ld_defconn;
 343                                 ++lc->lconn_refcnt;     /* avoid premature free */
 344                                 ld->ld_defconn = lc;
 345
 346                                 Debug( LDAP_DEBUG_TRACE, "Call application rebindproc\n", 0, 0, 0);
 347                                 err = (*ld->ld_rebindproc)( ld, bind->ri_url, bind->ri_request, bind->ri_msgid);
 348
 349                                 ld->ld_defconn = savedefconn;
 350                                 --lc->lconn_refcnt;
 351
 352                                 if( err != 0) {
 353                                 err = -1;
 354                                         ldap_free_connection( ld, lc, 1, 0 );
 355                                         lc = NULL;
 356                         }
 357                                 ldap_free_urldesc( srvfunc);
 358                 }
 359                 } else {
 360                         savedefconn = ld->ld_defconn;
 361                         ++lc->lconn_refcnt;     /* avoid premature free */
 362                         ld->ld_defconn = lc;
 363
 364                         Debug( LDAP_DEBUG_TRACE, "anonymous rebind via ldap_bind_s\n", 0, 0, 0);
 365                         if ( ldap_bind_s( ld, "", "", LDAP_AUTH_SIMPLE ) != LDAP_SUCCESS ) {
 366                                 err = -1;
 367                         }
 368                         ld->ld_defconn = savedefconn;
 369                         --lc->lconn_refcnt;
 370
 371                 if ( err != 0 ) {
 372                         ldap_free_connection( ld, lc, 1, 0 );
 373                         lc = NULL;
 374                 }
 375         }
 376                 if( lc != NULL)
 377                         lc->lconn_rebind_inprogress = 0;
 378         }
 379
 380         return( lc );
 381 }
 382
 383
 384 static LDAPConn *
 385 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 386 /*
 387  * return an existing connection (if any) to the server srv
 388  * if "any" is non-zero, check for any server in the "srv" chain
 389  */
 390 {
 391         LDAPConn        *lc;
 392         LDAPURLDesc     *ls;
 393
 394         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 395                 for ( ls = srv; ls != NULL; ls = ls->lud_next ) {
 396                         if ( lc->lconn_server->lud_host != NULL &&
 397                             ls->lud_host != NULL && strcasecmp(
 398                             ls->lud_host, lc->lconn_server->lud_host ) == 0
 399                             && ls->lud_port == lc->lconn_server->lud_port ) {
 400                                 return( lc );
 401                         }
 402                         if ( !any ) {
 403                                 break;
 404                         }
 405                 }
 406         }
 407
 408         return( NULL );
 409 }
 410
 411
 412
 413 static void
 414 use_connection( LDAP *ld, LDAPConn *lc )
 415 {
 416         ++lc->lconn_refcnt;
 417         lc->lconn_lastused = time( NULL );
 418 }
 419
 420
 421 void
 422 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 423 {
 424         LDAPConn        *tmplc, *prevlc;
 425
 426         Debug( LDAP_DEBUG_TRACE, "ldap_free_connection\n", 0, 0, 0 );
 427
 428         if ( force || --lc->lconn_refcnt <= 0 ) {
 429                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 430                         ldap_mark_select_clear( ld, lc->lconn_sb );
 431                         if ( unbind ) {
 432                                 ldap_send_unbind( ld, lc->lconn_sb, NULL, NULL );
 433                         }
 434                 }
 435
 436                 if( lc->lconn_ber != NULL ) {
 437                         ber_free( lc->lconn_ber, 1 );
 438                 }
 439
 440                 prevlc = NULL;
 441                 for ( tmplc = ld->ld_conns; tmplc != NULL;
 442                     tmplc = tmplc->lconn_next ) {
 443                         if ( tmplc == lc ) {
 444                                 if ( prevlc == NULL ) {
 445                                     ld->ld_conns = tmplc->lconn_next;
 446                                 } else {
 447                                     prevlc->lconn_next = tmplc->lconn_next;
 448                                 }
 449                                 break;
 450                         }
 451                         prevlc = tmplc;
 452                 }
 453                 ldap_free_urllist( lc->lconn_server );
 454                 if ( lc->lconn_krbinstance != NULL ) {
 455                         LDAP_FREE( lc->lconn_krbinstance );
 456                 }
 457                 if ( lc->lconn_sb != ld->ld_sb ) {
 458                         ber_sockbuf_free( lc->lconn_sb );
 459                 }
 460                 if( lc->lconn_rebind_queue != NULL) {
 461                         int i;
 462                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++) {
 463                                 free_strarray(lc->lconn_rebind_queue[i]);
 464                         }
 465                         LDAP_FREE( lc->lconn_rebind_queue);
 466                 }
 467                 LDAP_FREE( lc );
 468                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: actually freed\n",
 469                     0, 0, 0 );
 470         } else {
 471                 lc->lconn_lastused = time( NULL );
 472                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 473                     lc->lconn_refcnt, 0, 0 );
 474         }
 475 }
 476
 477
 478 #ifdef LDAP_DEBUG
 479 void
 480 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 481 {
 482         LDAPConn        *lc;
 483         char            timebuf[32];
 484
 485         fprintf( stderr, "** Connection%s:\n", all ? "s" : "" );
 486         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 487                 if ( lc->lconn_server != NULL ) {
 488                         fprintf( stderr, "* host: %s  port: %d%s\n",
 489                             ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 490                             : lc->lconn_server->lud_host,
 491                             lc->lconn_server->lud_port, ( lc->lconn_sb ==
 492                             ld->ld_sb ) ? "  (default)" : "" );
 493                 }
 494                 fprintf( stderr, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 495                     ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET ) ?
 496                     "NeedSocket" : ( lc->lconn_status ==
 497                     LDAP_CONNST_CONNECTING ) ? "Connecting" : "Connected" );
 498                 fprintf( stderr, "  last used: %s",
 499                     ldap_pvt_ctime( &lc->lconn_lastused, timebuf ));
 500                 if( lc->lconn_rebind_inprogress ) {
 501                         fprintf( stderr, "  rebind in progress\n");
 502                         if( lc->lconn_rebind_queue != NULL) {
 503                                 int i = 0;
 504                                 for( ;lc->lconn_rebind_queue[i] != NULL; i++) {
 505                                         int j = 0;
 506                                         for( ;lc->lconn_rebind_queue[i][j] != 0; j++) {
 507                                                 fprintf( stderr, "    queue %d entry %d - %s\n",
 508                                                         i, j, lc->lconn_rebind_queue[i][j]);
 509                                         }
 510                                 }
 511                         } else {
 512                                 fprintf( stderr, "    queue is empty\n");
 513                         }
 514                 }
 515                 fprintf(stderr, "\n");
 516                 if ( !all ) {
 517                         break;
 518                 }
 519         }
 520 }
 521
 522
 523 void
 524 ldap_dump_requests_and_responses( LDAP *ld )
 525 {
 526         LDAPRequest     *lr;
 527         LDAPMessage     *lm, *l;
 528
 529         fprintf( stderr, "** Outstanding Requests:\n" );
 530         if (( lr = ld->ld_requests ) == NULL ) {
 531                 fprintf( stderr, "   Empty\n" );
 532         }
 533         for ( ; lr != NULL; lr = lr->lr_next ) {
 534             fprintf( stderr, " * msgid %d,  origid %d, status %s\n",
 535                 lr->lr_msgid, lr->lr_origid,
 536                 ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 537                 ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 538                 ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 539                 ( lr->lr_status == LDAP_REQST_WRITING) ? "Writing" :
 540                 ( lr->lr_status == LDAP_REQST_COMPLETED ? "Request Completed" : "Invalid Status"));
 541             fprintf( stderr, "   outstanding referrals %d, parent count %d\n",
 542                     lr->lr_outrefcnt, lr->lr_parentcnt );
 543         }
 544
 545         fprintf( stderr, "** Response Queue:\n" );
 546         if (( lm = ld->ld_responses ) == NULL ) {
 547                 fprintf( stderr, "   Empty\n" );
 548         }
 549         for ( ; lm != NULL; lm = lm->lm_next ) {
 550                 fprintf( stderr, " * msgid %d,  type %lu\n",
 551                     lm->lm_msgid, (unsigned long) lm->lm_msgtype );
 552                 if (( l = lm->lm_chain ) != NULL ) {
 553                         fprintf( stderr, "   chained responses:\n" );
 554                         for ( ; l != NULL; l = l->lm_chain ) {
 555                                 fprintf( stderr,
 556                                     "  * msgid %d,  type %lu\n",
 557                                     l->lm_msgid,
 558                                     (unsigned long) l->lm_msgtype );
 559                         }
 560                 }
 561         }
 562 }
 563 #endif /* LDAP_DEBUG */
 564
 565
 566 void
 567 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 568 {
 569         LDAPRequest     *tmplr, *nextlr;
 570
 571         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 572                 lr->lr_origid, lr->lr_msgid, 0 );
 573
 574         if ( lr->lr_parent != NULL ) {
 575                 --lr->lr_parent->lr_outrefcnt;
 576         } else {
 577                 /* free all referrals (child requests) */
 578                 for ( tmplr = lr->lr_refnext; tmplr != NULL; tmplr = nextlr ) {
 579                         nextlr = tmplr->lr_refnext;
 580                         ldap_free_request( ld, tmplr );
 581                 }
 582         }
 583
 584         if ( lr->lr_prev == NULL ) {
 585                 ld->ld_requests = lr->lr_next;
 586         } else {
 587                 lr->lr_prev->lr_next = lr->lr_next;
 588         }
 589
 590         if ( lr->lr_next != NULL ) {
 591                 lr->lr_next->lr_prev = lr->lr_prev;
 592         }
 593
 594         if ( lr->lr_ber != NULL ) {
 595                 ber_free( lr->lr_ber, 1 );
 596         }
 597
 598         if ( lr->lr_res_error != NULL ) {
 599                 LDAP_FREE( lr->lr_res_error );
 600         }
 601
 602         if ( lr->lr_res_matched != NULL ) {
 603                 LDAP_FREE( lr->lr_res_matched );
 604         }
 605
 606         LDAP_FREE( lr );
 607 }
 608
 609 /*
 610  * Chase v3 referrals
 611  *
 612  * Parameters:
 613  *  (IN) ld = LDAP connection handle
 614  *  (IN) lr = LDAP Request structure
 615  *  (IN) refs = array of pointers to referral strings that we will chase
 616  *              The array will be free'd by this function when no longer needed
 617  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
 618  *  (OUT) hadrefp = 1 if sucessfully followed referral
 619  *
 620  * Return value - number of referrals followed
 621  */
 622 LIBLDAP_F(int)
 623 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, char **errstrp, int *hadrefp )
 624 {
 625         char            *unfollowed;
 626         int                      unfollowedcnt = 0;
 627         LDAPRequest     *origreq;
 628         LDAPURLDesc     *srv = NULL;
 629         BerElement      *ber;
 630         char            **refarray = NULL;
 631         LDAPConn        *lc;
 632         int                      rc, count, i, j;
 633         LDAPreqinfo  rinfo;
 634
 635         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 636         *hadrefp = 0;
 637
 638         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
 639
 640         unfollowed = NULL;
 641         rc = count = 0;
 642
 643         /* If no referrals in array, return */
 644         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
 645                 rc = 0;
 646                 goto done;
 647         }
 648
 649         /* Check for hop limit exceeded */
 650         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 651                 Debug( LDAP_DEBUG_ANY,
 652                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
 653                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
 654             rc = -1;
 655                 goto done;
 656         }
 657
 658         /* find original request */
 659         for ( origreq = lr; origreq->lr_parent != NULL; origreq = origreq->lr_parent ) {
 660                 ;
 661         }
 662
 663         refarray = refs;
 664         refs = NULL;
 665         /* parse out & follow referrals */
 666         for( i=0; refarray[i] != NULL; i++) {
 667                 /* Parse the referral URL */
 668                 if (( rc = ldap_url_parse( refarray[i], &srv)) != LDAP_SUCCESS) {
 669                         ld->ld_errno = rc;
 670                         rc = -1;
 671                         goto done;
 672                 }
 673
 674                 /* treat ldap://hostpart and ldap://hostpart/ the same */
 675                 if ( srv->lud_dn && srv->lud_dn[0] == '\0' ) {
 676                         LDAP_FREE( srv->lud_dn );
 677                         srv->lud_dn = NULL;
 678                 }
 679
 680                 /* check connection for re-bind in progress */
 681                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
 682                         if( lc->lconn_rebind_inprogress) {
 683                                 /* We are already chasing a referral or search reference and a
 684                                  * bind on that connection is in progress.  We must queue
 685                                  * referrals on that connection, so we don't get a request
 686                                  * going out before the bind operation completes. This happens
 687                                  * if two search references come in one behind the other
 688                                  * for the same server with different contexts.
 689                                  */
 690                                 Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals: queue referral \"%s\"\n",
 691                                         refarray[i], 0, 0);
 692                                 if( lc->lconn_rebind_queue == NULL ) {
 693                                         /* Create a referral list */
 694                                         if( (lc->lconn_rebind_queue = (char ***)LDAP_MALLOC( sizeof(void *) * 2)) == NULL) {
 695                                                 ld->ld_errno = LDAP_NO_MEMORY;
 696                                                 rc = -1;
 697                                                 goto done;
 698                                         }
 699                                         lc->lconn_rebind_queue[0] = refarray;
 700                                         lc->lconn_rebind_queue[1] = NULL;
 701                                         refarray = NULL;
 702                                 } else {
 703                                         /* Count how many referral arrays we already have */
 704                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 705                                                 ;
 706                                         }
 707                                         /* Add the new referral to the list */
 708                                         if( (lc->lconn_rebind_queue = (char ***)LDAP_REALLOC(
 709                                                         lc->lconn_rebind_queue, sizeof(void *) * (j + 2))) == NULL) {
 710                                                 ld->ld_errno = LDAP_NO_MEMORY;
 711                                                 rc = -1;
 712                                                 goto done;
 713                                         }
 714                                         lc->lconn_rebind_queue[j] = refarray;
 715                                         lc->lconn_rebind_queue[j+1] = NULL;
 716                                         refarray = NULL;
 717                                 }
 718                                 /* We have queued the referral/reference, now just return */
 719                                 rc = 0;
 720                                 *hadrefp = 1;
 721                                 count = 1; /* Pretend we already followed referral */
 722                                 goto done;
 723                         }
 724                 }
 725                 /* Re-encode the request with the new starting point of the search.
 726                  * Note: In the future we also need to replace the filter if one
 727                  * was provided with the search reference
 728                  */
 729                 if (( ber = re_encode_request( ld, origreq->lr_ber,
 730                             ++ld->ld_msgid, &srv->lud_dn, &rinfo.ri_request )) == NULL ) {
 731                         ld->ld_errno = LDAP_ENCODING_ERROR;
 732                         rc = -1;
 733                         goto done;
 734                 }
 735
 736                 Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
 737                         lr->lr_msgid, refarray[i], 0);
 738
 739                 /* Send the new request to the server - may require a bind */
 740                 rinfo.ri_msgid = origreq->lr_origid;
 741                 rinfo.ri_url = refarray[i];
 742                 if ( (rc = ldap_send_server_request( ld, ber, ld->ld_msgid,
 743                         origreq, srv, NULL, &rinfo )) < 0 ) {
 744                         /* Failure, try next referral in the list */
 745                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%s)\n",
 746                                 refarray[i], ldap_err2string( ld->ld_errno ), 0);
 747                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i]);
 748                         ldap_free_urllist(srv);
 749                         srv = NULL;
 750                 } else {
 751                         /* Success, no need to try this referral list further */
 752                         rc = 0;
 753                         ++count;
 754                         *hadrefp = 1;
 755
 756                         /* check if there is a queue of referrals that came in during bind */
 757                         if( lc == NULL) {
 758                                 if (( lc = find_connection( ld, srv, 1 )) == NULL ) {
 759                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
 760                                         rc = -1;
 761                                         goto done;
 762                                 }
 763                         }
 764
 765                         if( lc->lconn_rebind_queue != NULL) {
 766                                 /* Release resources of previous list */
 767                                 free_strarray(refarray);
 768                                 refarray = NULL;
 769                                 ldap_free_urllist(srv);
 770                                 srv = NULL;
 771
 772                                 /* Pull entries off end of queue so list always null terminated */
 773                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 774                                         ;
 775                                 }
 776                                 refarray = lc->lconn_rebind_queue[j-1];
 777                                 lc->lconn_rebind_queue[j-1] = NULL;
 778                                 /* we pulled off last entry from queue, free queue */
 779                                 if ( j == 1 ) {
 780                                         LDAP_FREE( lc->lconn_rebind_queue);
 781                                         lc->lconn_rebind_queue = NULL;
 782                                 }
 783                                 /* restart the loop the with new referral list */
 784                                 i = -1;
 785                                 continue;
 786                         }
 787                         break; /* referral followed, break out of for loop */
 788                 }
 789         } /* end for loop */
 790 done:
 791         free_strarray(refarray);
 792         ldap_free_urllist(srv);
 793         LDAP_FREE( *errstrp );
 794
 795         if( rc == 0) {
 796                 *errstrp = NULL;
 797                 LDAP_FREE( unfollowed );
 798                 return count;
 799         } else {
 800                 ld->ld_errno = LDAP_REFERRAL;
 801                 *errstrp = unfollowed;
 802                 return rc;
 803         }
 804 }
 805
 806 /*
 807  * XXX merging of errors in this routine needs to be improved
 808  */
 809 int
 810 ldap_chase_referrals( LDAP *ld, LDAPRequest *lr, char **errstrp, int *hadrefp )
 811 {
 812         int             rc, count, len, newdn;
 813 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 814         int             ldapref;
 815 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 816         char            *p, *ports, *ref, *tmpref, *refdn, *unfollowed;
 817         LDAPRequest     *origreq;
 818         LDAPURLDesc     *srv;
 819         BerElement      *ber;
 820         LDAPreqinfo  rinfo;
 821
 822         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
 823
 824         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 825         *hadrefp = 0;
 826
 827         if ( *errstrp == NULL ) {
 828                 return( 0 );
 829         }
 830
 831         len = strlen( *errstrp );
 832         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
 833                 if (( *p == 'R' || *p == 'r' ) && strncasecmp( p,
 834                     LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
 835                         *p = '\0';
 836                         p += LDAP_REF_STR_LEN;
 837                         break;
 838                 }
 839         }
 840
 841         if ( len < LDAP_REF_STR_LEN ) {
 842                 return( 0 );
 843         }
 844
 845         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 846                 Debug( LDAP_DEBUG_ANY,
 847                     "more than %d referral hops (dropping)\n",
 848                     ld->ld_refhoplimit, 0, 0 );
 849                     /* XXX report as error in ld->ld_errno? */
 850                     return( 0 );
 851         }
 852
 853         /* find original request */
 854         for ( origreq = lr; origreq->lr_parent != NULL;
 855              origreq = origreq->lr_parent ) {
 856                 ;
 857         }
 858
 859         unfollowed = NULL;
 860         rc = count = 0;
 861
 862         /* parse out & follow referrals */
 863         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
 864 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 865                 ldapref = 0;
 866 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 867
 868                 if (( p = strchr( ref, '\n' )) != NULL ) {
 869                         *p++ = '\0';
 870                 } else {
 871                         p = NULL;
 872                 }
 873
 874                 ldap_pvt_hex_unescape( ref );
 875                 len = strlen( ref );
 876
 877                 if ( len > LDAP_LDAP_REF_STR_LEN && strncasecmp( ref,
 878                     LDAP_LDAP_REF_STR, LDAP_LDAP_REF_STR_LEN ) == 0 ) {
 879                         Debug( LDAP_DEBUG_TRACE,
 880                             "chasing LDAP referral: <%s>\n", ref, 0, 0 );
 881 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 882                         ldapref = 1;
 883 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 884                         tmpref = ref + LDAP_LDAP_REF_STR_LEN;
 885 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 886                 } else if ( len > LDAP_DX_REF_STR_LEN && strncasecmp( ref,
 887                     LDAP_DX_REF_STR, LDAP_DX_REF_STR_LEN ) == 0 ) {
 888                         Debug( LDAP_DEBUG_TRACE,
 889                             "chasing DX referral: <%s>\n", ref, 0, 0 );
 890                         tmpref = ref + LDAP_DX_REF_STR_LEN;
 891 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 892                 } else {
 893                         Debug( LDAP_DEBUG_TRACE,
 894                             "ignoring unknown referral <%s>\n", ref, 0, 0 );
 895                         rc = ldap_append_referral( ld, &unfollowed, ref );
 896                         *hadrefp = 1;
 897                         continue;
 898                 }
 899
 900                 /* copy the complete referral for rebind process */
 901                 rinfo.ri_url = LDAP_STRDUP( ref );
 902
 903                 *hadrefp = 1;
 904
 905                 if (( refdn = strchr( tmpref, '/' )) != NULL ) {
 906                         *refdn++ = '\0';
 907                         newdn = refdn[0] != '?' && refdn[0] != '\0';
 908                         if( !newdn ) refdn = NULL;
 909                 } else {
 910                         newdn = 0;
 911                 }
 912
 913                 if (( ber = re_encode_request( ld, origreq->lr_ber,
 914                     ++ld->ld_msgid, &refdn, &rinfo.ri_request )) == NULL ) {
 915                         return( -1 );
 916                 }
 917
 918 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 919                 if ( ldapref ) {
 920 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 921                         if (( srv = (LDAPURLDesc *)LDAP_CALLOC( 1,
 922                             sizeof( LDAPURLDesc ))) == NULL ) {
 923                                 ber_free( ber, 1 );
 924                                 ld->ld_errno = LDAP_NO_MEMORY;
 925                                 return( -1 );
 926                         }
 927
 928                         if (( srv->lud_host = LDAP_STRDUP( tmpref )) == NULL ) {
 929                                 LDAP_FREE( (char *)srv );
 930                                 ber_free( ber, 1 );
 931                                 ld->ld_errno = LDAP_NO_MEMORY;
 932                                 return( -1 );
 933                         }
 934
 935                         if (( ports = strchr( srv->lud_host, ':' )) != NULL ) {
 936                                 *ports++ = '\0';
 937                                 srv->lud_port = atoi( ports );
 938                         } else {
 939                                 srv->lud_port = ldap_int_global_options.ldo_defport;
 940                         }
 941 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 942                 } else {
 943                         srv = dn2servers( ld, tmpref );
 944                 }
 945 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 946
 947                 rinfo.ri_msgid = origreq->lr_origid;
 948                 if ( srv != NULL && ldap_send_server_request( ld, ber, ld->ld_msgid,
 949                     lr, srv, NULL, &rinfo ) >= 0 ) {
 950                         ++count;
 951                 } else {
 952                         Debug( LDAP_DEBUG_ANY,
 953                             "Unable to chase referral (%s)\n",
 954                             ldap_err2string( ld->ld_errno ), 0, 0 );
 955                         rc = ldap_append_referral( ld, &unfollowed, ref );
 956                 }
 957                 LDAP_FREE( rinfo.ri_url);
 958
 959                 if (srv != NULL)
 960                         ldap_free_urllist(srv);
 961
 962                 if ( !newdn && refdn != NULL ) {
 963                         LDAP_FREE( refdn );
 964                 }
 965         }
 966
 967         LDAP_FREE( *errstrp );
 968         *errstrp = unfollowed;
 969
 970         return(( rc == 0 ) ? count : rc );
 971 }
 972
 973
 974 int
 975 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
 976 {
 977         int     first;
 978
 979         if ( *referralsp == NULL ) {
 980                 first = 1;
 981                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
 982                     + 1 );
 983         } else {
 984                 first = 0;
 985                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
 986                     strlen( *referralsp ) + strlen( s ) + 2 );
 987         }
 988
 989         if ( *referralsp == NULL ) {
 990                 ld->ld_errno = LDAP_NO_MEMORY;
 991                 return( -1 );
 992         }
 993
 994         if ( first ) {
 995                 strcpy( *referralsp, LDAP_REF_STR );
 996         } else {
 997                 strcat( *referralsp, "\n" );
 998         }
 999         strcat( *referralsp, s );
1000
1001         return( 0 );
1002 }
1003
1004
1005
1006 static BerElement *
1007 re_encode_request( LDAP *ld, BerElement *origber, ber_int_t msgid, char **dnp, int *type )
1008 {
1009 /*
1010  * XXX this routine knows way too much about how the lber library works!
1011  */
1012         ber_int_t       along;
1013         ber_tag_t       tag;
1014         ber_int_t       ver;
1015         int             rc;
1016         BerElement      tmpber, *ber;
1017         char            *orig_dn;
1018
1019         Debug( LDAP_DEBUG_TRACE,
1020             "re_encode_request: new msgid %ld, new dn <%s>\n",
1021             (long) msgid, ( *dnp == NULL ) ? "NONE" : *dnp, 0 );
1022
1023         tmpber = *origber;
1024
1025         /*
1026          * all LDAP requests are sequences that start with a message id.
1027          * For all except delete, this is followed by a sequence that is
1028          * tagged with the operation code.  For delete, the provided DN
1029          * is not wrapped by a sequence.
1030          */
1031         rc = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
1032
1033         if ( rc == LBER_ERROR ) {
1034                 ld->ld_errno = LDAP_DECODING_ERROR;
1035                 return( NULL );
1036         }
1037
1038         assert( tag != 0);
1039         if ( tag == LDAP_REQ_BIND ) {
1040                 /* bind requests have a version number before the DN & other stuff */
1041                 rc = ber_scanf( &tmpber, "{ia" /*}*/, &ver, &orig_dn );
1042
1043         } else if ( tag == LDAP_REQ_DELETE ) {
1044                 /* delete requests don't have a DN wrapping sequence */
1045                 rc = ber_scanf( &tmpber, "a", &orig_dn );
1046
1047         } else {
1048                 rc = ber_scanf( &tmpber, "{a" /*}*/, &orig_dn );
1049         }
1050
1051         if( rc == LBER_ERROR ) {
1052                 ld->ld_errno = LDAP_DECODING_ERROR;
1053                 return NULL;
1054         }
1055
1056         if ( *dnp == NULL ) {
1057                 *dnp = orig_dn;
1058         } else {
1059                 LDAP_FREE( orig_dn );
1060         }
1061
1062         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1063                 return( NULL );
1064         }
1065
1066         if ( tag == LDAP_REQ_BIND ) {
1067                 rc = ber_printf( ber, "{it{is" /*}}*/, msgid, tag, ver, *dnp );
1068         } else if ( tag == LDAP_REQ_DELETE ) {
1069                 rc = ber_printf( ber, "{its}", msgid, tag, *dnp );
1070         } else {
1071                 rc = ber_printf( ber, "{it{s" /*}}*/, msgid, tag, *dnp );
1072         }
1073
1074         if ( rc == -1 ) {
1075                 ld->ld_errno = LDAP_ENCODING_ERROR;
1076                 ber_free( ber, 1 );
1077                 return( NULL );
1078         }
1079
1080         if ( tag != LDAP_REQ_DELETE && (
1081                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1082                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1083             ber_printf( ber, /*{{*/ "}}" ) == -1 ) )
1084         {
1085                 ld->ld_errno = LDAP_ENCODING_ERROR;
1086                 ber_free( ber, 1 );
1087                 return( NULL );
1088         }
1089
1090 #ifdef LDAP_DEBUG
1091         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1092                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1093                     0, 0, 0 );
1094                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1095         }
1096 #endif /* LDAP_DEBUG */
1097
1098         *type = tag;    /* return request type */
1099         return( ber );
1100 }
1101
1102
1103 LDAPRequest *
1104 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1105 {
1106         LDAPRequest     *lr;
1107
1108         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1109                 if( lr->lr_status == LDAP_REQST_COMPLETED ) {
1110                         continue;       /* Skip completed requests */
1111                 }
1112                 if ( msgid == lr->lr_msgid ) {
1113                         break;
1114                 }
1115         }
1116
1117         return( lr );
1118 }
1119
1120
1121 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
1122 static LDAPURLDesc *
1123 dn2servers( LDAP *ld, const char *dn )  /* dn can also be a domain.... */
1124 {
1125         char            *p, *host, *server_dn, **dxs;
1126         const char *domain;
1127         int             i, port;
1128         LDAPURLDesc     *srvlist, *prevsrv, *srv;
1129
1130         if (( domain = strrchr( dn, '@' )) != NULL ) {
1131                 ++domain;
1132         } else {
1133                 domain = dn;
1134         }
1135
1136         if (( dxs = ldap_getdxbyname( domain )) == NULL ) {
1137                 ld->ld_errno = LDAP_NO_MEMORY;
1138                 return( NULL );
1139         }
1140
1141         srvlist = NULL;
1142         for ( i = 0; dxs[ i ] != NULL; ++i ) {
1143                 if (ldap_url_parselist(&srv, dxs[i]) == LDAP_SUCCESS
1144                         || ldap_url_parsehosts(&srv, dxs[i]) == LDAP_SUCCESS)
1145                 {
1146                         /* add to end of list of servers */
1147                         if ( srvlist == NULL ) {
1148                                 srvlist = srv;
1149                         } else {
1150                                 prevsrv->lud_next = srv;
1151                         }
1152                         prevsrv = srv;
1153                 }
1154         }
1155
1156         ldap_value_free( dxs );
1157
1158         if ( srvlist == NULL ) {
1159                 ld->ld_errno = LDAP_SERVER_DOWN;
1160         }
1161
1162         return( srvlist );
1163 }
1164 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */