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 static BerElement *
  49 re_encode_request( LDAP *ld,
  50         BerElement *origber,
  51         ber_int_t msgid,
  52         int sref,
  53         LDAPURLDesc *srv,
  54         int *type );
  55
  56 BerElement *
  57 ldap_alloc_ber_with_options( LDAP *ld )
  58 {
  59         BerElement      *ber;
  60
  61     if (( ber = ber_alloc_t( ld->ld_lberoptions )) == NULL ) {
  62                 ld->ld_errno = LDAP_NO_MEMORY;
  63         }
  64
  65         return( ber );
  66 }
  67
  68
  69 void
  70 ldap_set_ber_options( LDAP *ld, BerElement *ber )
  71 {
  72         ber->ber_options = ld->ld_lberoptions;
  73 }
  74
  75
  76 ber_int_t
  77 ldap_send_initial_request(
  78         LDAP *ld,
  79         ber_tag_t msgtype,
  80         const char *dn,
  81         BerElement *ber )
  82 {
  83         LDAPURLDesc     *servers;
  84         int rc;
  85
  86         Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
  87
  88         if ( ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, NULL ) == -1 ) {
  89                 /* not connected yet */
  90                 int rc = ldap_open_defconn( ld );
  91
  92                 if( rc < 0 ) {
  93                         ber_free( ber, 1 );
  94                         return( -1 );
  95                 }
  96
  97                 Debug( LDAP_DEBUG_TRACE,
  98                         "ldap_delayed_open successful, ld_host is %s\n",
  99                         ( ld->ld_host == NULL ) ? "(null)" : ld->ld_host, 0, 0 );
 100         }
 101
 102         {
 103                 /*
 104                  * use of DNS is turned off or this is an X.500 DN...
 105                  * use our default connection
 106                  */
 107                 servers = NULL;
 108         }
 109
 110         rc = ldap_send_server_request( ld, ber, ld->ld_msgid, NULL,
 111                                                                         servers, NULL, NULL );
 112         if (servers)
 113                 ldap_free_urllist(servers);
 114         return(rc);
 115 }
 116
 117
 118
 119 int
 120 ldap_send_server_request(
 121         LDAP *ld,
 122         BerElement *ber,
 123         ber_int_t msgid,
 124         LDAPRequest *parentreq,
 125         LDAPURLDesc *srvlist,
 126         LDAPConn *lc,
 127         LDAPreqinfo *bind )
 128 {
 129         LDAPRequest     *lr;
 130         int incparent;
 131
 132         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 133
 134         incparent = 0;
 135         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 136
 137         if ( lc == NULL ) {
 138                 if ( srvlist == NULL ) {
 139                         lc = ld->ld_defconn;
 140                 } else {
 141                         if (( lc = find_connection( ld, srvlist, 1 )) ==
 142                             NULL ) {
 143                                 if ( (bind != NULL) && (parentreq != NULL) ) {
 144                                         /* Remember the bind in the parent */
 145                                         incparent = 1;
 146                                         ++parentreq->lr_outrefcnt;
 147                                 }
 148                                 lc = ldap_new_connection( ld, srvlist, 0, 1, bind );
 149                         }
 150                 }
 151         }
 152
 153         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 154                 ber_free( ber, 1 );
 155                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 156                         ld->ld_errno = LDAP_SERVER_DOWN;
 157                 }
 158                 if ( incparent ) {
 159                         /* Forget about the bind */
 160                         --parentreq->lr_outrefcnt;
 161                 }
 162                 return( -1 );
 163         }
 164
 165         use_connection( ld, lc );
 166         if (( lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ))) ==
 167             NULL ) {
 168                 ld->ld_errno = LDAP_NO_MEMORY;
 169                 ldap_free_connection( ld, lc, 0, 0 );
 170                 ber_free( ber, 1 );
 171                 if ( incparent ) {
 172                         /* Forget about the bind */
 173                         --parentreq->lr_outrefcnt;
 174                 }
 175                 return( -1 );
 176         }
 177         lr->lr_msgid = msgid;
 178         lr->lr_status = LDAP_REQST_INPROGRESS;
 179         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 180         lr->lr_ber = ber;
 181         lr->lr_conn = lc;
 182         if ( parentreq != NULL ) {      /* sub-request */
 183                 if ( !incparent ) {
 184                         /* Increment if we didn't do it before the bind */
 185                         ++parentreq->lr_outrefcnt;
 186                 }
 187                 lr->lr_origid = parentreq->lr_origid;
 188                 lr->lr_parentcnt = parentreq->lr_parentcnt + 1;
 189                 lr->lr_parent = parentreq;
 190                 lr->lr_refnext = parentreq->lr_refnext;
 191                 parentreq->lr_refnext = lr;
 192         } else {                        /* original request */
 193                 lr->lr_origid = lr->lr_msgid;
 194         }
 195
 196         if (( lr->lr_next = ld->ld_requests ) != NULL ) {
 197                 lr->lr_next->lr_prev = lr;
 198         }
 199         ld->ld_requests = lr;
 200         lr->lr_prev = NULL;
 201
 202         if ( ber_flush( lc->lconn_sb, ber, 0 ) != 0 ) {
 203 #ifdef notyet
 204                 if ( errno == EWOULDBLOCK ) {
 205                         /* need to continue write later */
 206                         lr->lr_status = LDAP_REQST_WRITING;
 207                         ldap_mark_select_write( ld, lc->lconn_sb );
 208                 } else {
 209 #else /* notyet */
 210                         ld->ld_errno = LDAP_SERVER_DOWN;
 211                         ldap_free_request( ld, lr );
 212                         ldap_free_connection( ld, lc, 0, 0 );
 213                         return( -1 );
 214 #endif /* notyet */
 215 #ifdef notyet
 216                 }
 217 #endif /* notyet */
 218         } else {
 219                 if ( parentreq == NULL ) {
 220                         ber->ber_end = ber->ber_ptr;
 221                         ber->ber_ptr = ber->ber_buf;
 222                 }
 223
 224                 /* sent -- waiting for a response */
 225                 ldap_mark_select_read( ld, lc->lconn_sb );
 226         }
 227
 228         ld->ld_errno = LDAP_SUCCESS;
 229         return( msgid );
 230 }
 231
 232 LDAPConn *
 233 ldap_new_connection( LDAP *ld, LDAPURLDesc *srvlist, int use_ldsb,
 234         int connect, LDAPreqinfo *bind )
 235 {
 236         LDAPConn        *lc;
 237         LDAPURLDesc     *srv;
 238         Sockbuf         *sb = NULL;
 239
 240         Debug( LDAP_DEBUG_TRACE, "ldap_new_connection\n", 0, 0, 0 );
 241         /*
 242          * make a new LDAP server connection
 243          * XXX open connection synchronously for now
 244          */
 245         if (( lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ))) == NULL ||
 246             ( !use_ldsb && ( (sb = ber_sockbuf_alloc()) == NULL ))) {
 247                 if ( lc != NULL ) {
 248                         LDAP_FREE( (char *)lc );
 249                 }
 250                 ld->ld_errno = LDAP_NO_MEMORY;
 251                 return( NULL );
 252         }
 253
 254         lc->lconn_sb = ( use_ldsb ) ? ld->ld_sb : sb;
 255
 256         if ( connect ) {
 257                 for ( srv = srvlist; srv != NULL; srv = srv->lud_next ) {
 258                         if ( ldap_int_open_connection( ld, lc, srv, 0 ) != -1 ) {
 259                                 break;
 260                         }
 261                 }
 262
 263                 if ( srv == NULL ) {
 264                         if ( !use_ldsb ) {
 265                                 ber_sockbuf_free( lc->lconn_sb );
 266                         }
 267                     LDAP_FREE( (char *)lc );
 268                     ld->ld_errno = LDAP_SERVER_DOWN;
 269                     return( NULL );
 270                 }
 271
 272                 lc->lconn_server = ldap_url_dup(srv);
 273         }
 274
 275         lc->lconn_status = LDAP_CONNST_CONNECTED;
 276         lc->lconn_next = ld->ld_conns;
 277         ld->ld_conns = lc;
 278
 279         /*
 280          * XXX for now, we always do a synchronous bind.  This will have
 281          * to change in the long run...
 282          */
 283         if ( bind != NULL) {
 284                 int             err = 0;
 285                 LDAPConn        *savedefconn;
 286
 287                 /* Set flag to prevent additional referrals from being processed on this
 288                  * connection until the bind has completed
 289                  */
 290                 lc->lconn_rebind_inprogress = 1;
 291                 /* V3 rebind function */
 292                 if ( ld->ld_rebindproc != NULL) {
 293                         LDAPURLDesc     *srvfunc;
 294                         if( ( srvfunc = ldap_url_dup( srvlist)) == NULL) {
 295                                 ld->ld_errno = LDAP_NO_MEMORY;
 296                                 err = -1;
 297                         } else {
 298                                 savedefconn = ld->ld_defconn;
 299                                 ++lc->lconn_refcnt;     /* avoid premature free */
 300                                 ld->ld_defconn = lc;
 301
 302                                 Debug( LDAP_DEBUG_TRACE, "Call application rebindproc\n", 0, 0, 0);
 303                                 err = (*ld->ld_rebindproc)( ld, bind->ri_url, bind->ri_request, bind->ri_msgid);
 304
 305                                 ld->ld_defconn = savedefconn;
 306                                 --lc->lconn_refcnt;
 307
 308                                 if( err != 0) {
 309                                 err = -1;
 310                                         ldap_free_connection( ld, lc, 1, 0 );
 311                                         lc = NULL;
 312                         }
 313                                 ldap_free_urldesc( srvfunc);
 314                 }
 315                 } else {
 316                         savedefconn = ld->ld_defconn;
 317                         ++lc->lconn_refcnt;     /* avoid premature free */
 318                         ld->ld_defconn = lc;
 319
 320                         Debug( LDAP_DEBUG_TRACE, "anonymous rebind via ldap_bind_s\n", 0, 0, 0);
 321                         if ( ldap_bind_s( ld, "", "", LDAP_AUTH_SIMPLE ) != LDAP_SUCCESS ) {
 322                                 err = -1;
 323                         }
 324                         ld->ld_defconn = savedefconn;
 325                         --lc->lconn_refcnt;
 326
 327                 if ( err != 0 ) {
 328                         ldap_free_connection( ld, lc, 1, 0 );
 329                         lc = NULL;
 330                 }
 331         }
 332                 if( lc != NULL)
 333                         lc->lconn_rebind_inprogress = 0;
 334         }
 335
 336         return( lc );
 337 }
 338
 339
 340 static LDAPConn *
 341 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 342 /*
 343  * return an existing connection (if any) to the server srv
 344  * if "any" is non-zero, check for any server in the "srv" chain
 345  */
 346 {
 347         LDAPConn        *lc;
 348         LDAPURLDesc     *ls;
 349
 350         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 351                 for ( ls = srv; ls != NULL; ls = ls->lud_next ) {
 352                         if ( lc->lconn_server->lud_host != NULL &&
 353                                 *lc->lconn_server->lud_host != '\0' &&
 354                             ls->lud_host != NULL && *ls->lud_host != '\0' &&
 355                                 strcasecmp( ls->lud_host, lc->lconn_server->lud_host ) == 0
 356                             && ls->lud_port == lc->lconn_server->lud_port ) {
 357                                 return lc;
 358                         }
 359                         if ( !any ) {
 360                                 break;
 361                         }
 362                 }
 363         }
 364
 365         return NULL;
 366 }
 367
 368
 369
 370 static void
 371 use_connection( LDAP *ld, LDAPConn *lc )
 372 {
 373         ++lc->lconn_refcnt;
 374         lc->lconn_lastused = time( NULL );
 375 }
 376
 377
 378 void
 379 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 380 {
 381         LDAPConn        *tmplc, *prevlc;
 382
 383         Debug( LDAP_DEBUG_TRACE, "ldap_free_connection\n", 0, 0, 0 );
 384
 385         if ( force || --lc->lconn_refcnt <= 0 ) {
 386                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 387                         ldap_mark_select_clear( ld, lc->lconn_sb );
 388                         if ( unbind ) {
 389                                 ldap_send_unbind( ld, lc->lconn_sb, NULL, NULL );
 390                         }
 391                 }
 392
 393                 if( lc->lconn_ber != NULL ) {
 394                         ber_free( lc->lconn_ber, 1 );
 395                 }
 396
 397                 ldap_int_sasl_close( ld, lc );
 398
 399                 prevlc = NULL;
 400                 for ( tmplc = ld->ld_conns; tmplc != NULL;
 401                     tmplc = tmplc->lconn_next ) {
 402                         if ( tmplc == lc ) {
 403                                 if ( prevlc == NULL ) {
 404                                     ld->ld_conns = tmplc->lconn_next;
 405                                 } else {
 406                                     prevlc->lconn_next = tmplc->lconn_next;
 407                                 }
 408                                 break;
 409                         }
 410                         prevlc = tmplc;
 411                 }
 412                 ldap_free_urllist( lc->lconn_server );
 413 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 414                 if ( lc->lconn_krbinstance != NULL ) {
 415                         LDAP_FREE( lc->lconn_krbinstance );
 416                 }
 417 #endif
 418                 if ( lc->lconn_sb != ld->ld_sb ) {
 419                         ber_sockbuf_free( lc->lconn_sb );
 420                 }
 421                 if( lc->lconn_rebind_queue != NULL) {
 422                         int i;
 423                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++) {
 424                                 LDAP_VFREE(lc->lconn_rebind_queue[i]);
 425                         }
 426                         LDAP_FREE( lc->lconn_rebind_queue);
 427                 }
 428                 LDAP_FREE( lc );
 429                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: actually freed\n",
 430                     0, 0, 0 );
 431         } else {
 432                 lc->lconn_lastused = time( NULL );
 433                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 434                     lc->lconn_refcnt, 0, 0 );
 435         }
 436 }
 437
 438
 439 #ifdef LDAP_DEBUG
 440 void
 441 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 442 {
 443         LDAPConn        *lc;
 444         char            timebuf[32];
 445
 446         fprintf( stderr, "** Connection%s:\n", all ? "s" : "" );
 447         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 448                 if ( lc->lconn_server != NULL ) {
 449                         fprintf( stderr, "* host: %s  port: %d%s\n",
 450                             ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 451                             : lc->lconn_server->lud_host,
 452                             lc->lconn_server->lud_port, ( lc->lconn_sb ==
 453                             ld->ld_sb ) ? "  (default)" : "" );
 454                 }
 455                 fprintf( stderr, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 456                     ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET ) ?
 457                     "NeedSocket" : ( lc->lconn_status ==
 458                     LDAP_CONNST_CONNECTING ) ? "Connecting" : "Connected" );
 459                 fprintf( stderr, "  last used: %s",
 460                     ldap_pvt_ctime( &lc->lconn_lastused, timebuf ));
 461                 if( lc->lconn_rebind_inprogress ) {
 462                         fprintf( stderr, "  rebind in progress\n");
 463                         if( lc->lconn_rebind_queue != NULL) {
 464                                 int i = 0;
 465                                 for( ;lc->lconn_rebind_queue[i] != NULL; i++) {
 466                                         int j = 0;
 467                                         for( ;lc->lconn_rebind_queue[i][j] != 0; j++) {
 468                                                 fprintf( stderr, "    queue %d entry %d - %s\n",
 469                                                         i, j, lc->lconn_rebind_queue[i][j]);
 470                                         }
 471                                 }
 472                         } else {
 473                                 fprintf( stderr, "    queue is empty\n");
 474                         }
 475                 }
 476                 fprintf(stderr, "\n");
 477                 if ( !all ) {
 478                         break;
 479                 }
 480         }
 481 }
 482
 483
 484 void
 485 ldap_dump_requests_and_responses( LDAP *ld )
 486 {
 487         LDAPRequest     *lr;
 488         LDAPMessage     *lm, *l;
 489
 490         fprintf( stderr, "** Outstanding Requests:\n" );
 491         if (( lr = ld->ld_requests ) == NULL ) {
 492                 fprintf( stderr, "   Empty\n" );
 493         }
 494         for ( ; lr != NULL; lr = lr->lr_next ) {
 495             fprintf( stderr, " * msgid %d,  origid %d, status %s\n",
 496                 lr->lr_msgid, lr->lr_origid,
 497                 ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 498                 ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 499                 ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 500                 ( lr->lr_status == LDAP_REQST_WRITING) ? "Writing" :
 501                 ( lr->lr_status == LDAP_REQST_COMPLETED ? "Request Completed" : "Invalid Status"));
 502             fprintf( stderr, "   outstanding referrals %d, parent count %d\n",
 503                     lr->lr_outrefcnt, lr->lr_parentcnt );
 504         }
 505
 506         fprintf( stderr, "** Response Queue:\n" );
 507         if (( lm = ld->ld_responses ) == NULL ) {
 508                 fprintf( stderr, "   Empty\n" );
 509         }
 510         for ( ; lm != NULL; lm = lm->lm_next ) {
 511                 fprintf( stderr, " * msgid %d,  type %lu\n",
 512                     lm->lm_msgid, (unsigned long) lm->lm_msgtype );
 513                 if (( l = lm->lm_chain ) != NULL ) {
 514                         fprintf( stderr, "   chained responses:\n" );
 515                         for ( ; l != NULL; l = l->lm_chain ) {
 516                                 fprintf( stderr,
 517                                     "  * msgid %d,  type %lu\n",
 518                                     l->lm_msgid,
 519                                     (unsigned long) l->lm_msgtype );
 520                         }
 521                 }
 522         }
 523 }
 524 #endif /* LDAP_DEBUG */
 525
 526
 527 void
 528 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 529 {
 530         LDAPRequest     *tmplr, *nextlr;
 531
 532         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 533                 lr->lr_origid, lr->lr_msgid, 0 );
 534
 535         if ( lr->lr_parent != NULL ) {
 536                 --lr->lr_parent->lr_outrefcnt;
 537         } else {
 538                 /* free all referrals (child requests) */
 539                 for ( tmplr = lr->lr_refnext; tmplr != NULL; tmplr = nextlr ) {
 540                         nextlr = tmplr->lr_refnext;
 541                         ldap_free_request( ld, tmplr );
 542                 }
 543         }
 544
 545         if ( lr->lr_prev == NULL ) {
 546                 ld->ld_requests = lr->lr_next;
 547         } else {
 548                 lr->lr_prev->lr_next = lr->lr_next;
 549         }
 550
 551         if ( lr->lr_next != NULL ) {
 552                 lr->lr_next->lr_prev = lr->lr_prev;
 553         }
 554
 555         if ( lr->lr_ber != NULL ) {
 556                 ber_free( lr->lr_ber, 1 );
 557         }
 558
 559         if ( lr->lr_res_error != NULL ) {
 560                 LDAP_FREE( lr->lr_res_error );
 561         }
 562
 563         if ( lr->lr_res_matched != NULL ) {
 564                 LDAP_FREE( lr->lr_res_matched );
 565         }
 566
 567         LDAP_FREE( lr );
 568 }
 569
 570 /*
 571  * Chase v3 referrals
 572  *
 573  * Parameters:
 574  *  (IN) ld = LDAP connection handle
 575  *  (IN) lr = LDAP Request structure
 576  *  (IN) refs = array of pointers to referral strings that we will chase
 577  *              The array will be free'd by this function when no longer needed
 578  *  (IN) sref != 0 if following search reference
 579  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
 580  *  (OUT) hadrefp = 1 if sucessfully followed referral
 581  *
 582  * Return value - number of referrals followed
 583  */
 584 int
 585 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
 586 {
 587         char            *unfollowed;
 588         int                      unfollowedcnt = 0;
 589         LDAPRequest     *origreq;
 590         LDAPURLDesc     *srv = NULL;
 591         BerElement      *ber;
 592         char            **refarray = NULL;
 593         LDAPConn        *lc;
 594         int                      rc, count, i, j;
 595         LDAPreqinfo  rinfo;
 596
 597         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 598         *hadrefp = 0;
 599
 600         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
 601
 602         unfollowed = NULL;
 603         rc = count = 0;
 604
 605         /* If no referrals in array, return */
 606         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
 607                 rc = 0;
 608                 goto done;
 609         }
 610
 611         /* Check for hop limit exceeded */
 612         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 613                 Debug( LDAP_DEBUG_ANY,
 614                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
 615                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
 616             rc = -1;
 617                 goto done;
 618         }
 619
 620         /* find original request */
 621         for ( origreq = lr;
 622                 origreq->lr_parent != NULL;
 623                 origreq = origreq->lr_parent )
 624         {
 625                 /* empty */ ;
 626         }
 627
 628         refarray = refs;
 629         refs = NULL;
 630         /* parse out & follow referrals */
 631         for( i=0; refarray[i] != NULL; i++) {
 632                 /* Parse the referral URL */
 633                 if (( rc = ldap_url_parse_ext( refarray[i], &srv)) != LDAP_SUCCESS) {
 634                         ld->ld_errno = rc;
 635                         rc = -1;
 636                         goto done;
 637                 }
 638
 639                 if( srv->lud_crit_exts ) {
 640                         /* we do not support any extensions */
 641                         ld->ld_errno = LDAP_NOT_SUPPORTED;
 642                         rc = -1;
 643                         goto done;
 644                 }
 645
 646                 /* treat ldap://hostpart and ldap://hostpart/ the same */
 647                 if ( srv->lud_dn && srv->lud_dn[0] == '\0' ) {
 648                         LDAP_FREE( srv->lud_dn );
 649                         srv->lud_dn = NULL;
 650                 }
 651
 652                 /* check connection for re-bind in progress */
 653                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
 654                         if( lc->lconn_rebind_inprogress) {
 655                                 /* We are already chasing a referral or search reference and a
 656                                  * bind on that connection is in progress.  We must queue
 657                                  * referrals on that connection, so we don't get a request
 658                                  * going out before the bind operation completes. This happens
 659                                  * if two search references come in one behind the other
 660                                  * for the same server with different contexts.
 661                                  */
 662                                 Debug( LDAP_DEBUG_TRACE,
 663                                         "ldap_chase_v3referrals: queue referral \"%s\"\n",
 664                                         refarray[i], 0, 0);
 665                                 if( lc->lconn_rebind_queue == NULL ) {
 666                                         /* Create a referral list */
 667                                         lc->lconn_rebind_queue =
 668                                                 (char ***) LDAP_MALLOC( sizeof(void *) * 2));
 669
 670                                         if( lc->lconn_rebind_queue == NULL) {
 671                                                 ld->ld_errno = LDAP_NO_MEMORY;
 672                                                 rc = -1;
 673                                                 goto done;
 674                                         }
 675
 676                                         lc->lconn_rebind_queue[0] = refarray;
 677                                         lc->lconn_rebind_queue[1] = NULL;
 678                                         refarray = NULL;
 679
 680                                 } else {
 681                                         /* Count how many referral arrays we already have */
 682                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 683                                                 /* empty */;
 684                                         }
 685
 686                                         /* Add the new referral to the list */
 687                                         lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
 688                                                 lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
 689
 690                                         if( lc->lconn_rebind_queue == NULL ) {
 691                                                 ld->ld_errno = LDAP_NO_MEMORY;
 692                                                 rc = -1;
 693                                                 goto done;
 694                                         }
 695                                         lc->lconn_rebind_queue[j] = refarray;
 696                                         lc->lconn_rebind_queue[j+1] = NULL;
 697                                         refarray = NULL;
 698                                 }
 699
 700                                 /* We have queued the referral/reference, now just return */
 701                                 rc = 0;
 702                                 *hadrefp = 1;
 703                                 count = 1; /* Pretend we already followed referral */
 704                                 goto done;
 705                         }
 706                 }
 707                 /* Re-encode the request with the new starting point of the search.
 708                  * Note: In the future we also need to replace the filter if one
 709                  * was provided with the search reference
 710                  */
 711
 712                 /* For references we don't want old dn if new dn empty */
 713                 if ( sref && srv->lud_dn == NULL ) {
 714                         srv->lud_dn = LDAP_STRDUP( "" );
 715                 }
 716
 717                 ber = re_encode_request( ld, origreq->lr_ber, ++ld->ld_msgid,
 718                         sref, srv, &rinfo.ri_request );
 719
 720                 if( ber == NULL ) {
 721                         ld->ld_errno = LDAP_ENCODING_ERROR;
 722                         rc = -1;
 723                         goto done;
 724                 }
 725
 726                 Debug( LDAP_DEBUG_TRACE,
 727                         "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
 728                         lr->lr_msgid, refarray[i], 0);
 729
 730                 /* Send the new request to the server - may require a bind */
 731                 rinfo.ri_msgid = origreq->lr_origid;
 732                 rinfo.ri_url = refarray[i];
 733                 if ( (rc = ldap_send_server_request( ld, ber, ld->ld_msgid,
 734                         origreq, srv, NULL, &rinfo )) < 0 ) {
 735                         /* Failure, try next referral in the list */
 736                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%s)\n",
 737                                 refarray[i], ldap_err2string( ld->ld_errno ), 0);
 738                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i]);
 739                         ldap_free_urllist(srv);
 740                         srv = NULL;
 741                 } else {
 742                         /* Success, no need to try this referral list further */
 743                         rc = 0;
 744                         ++count;
 745                         *hadrefp = 1;
 746
 747                         /* check if there is a queue of referrals that came in during bind */
 748                         if( lc == NULL) {
 749                                 if (( lc = find_connection( ld, srv, 1 )) == NULL ) {
 750                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
 751                                         rc = -1;
 752                                         goto done;
 753                                 }
 754                         }
 755
 756                         if( lc->lconn_rebind_queue != NULL) {
 757                                 /* Release resources of previous list */
 758                                 LDAP_VFREE(refarray);
 759                                 refarray = NULL;
 760                                 ldap_free_urllist(srv);
 761                                 srv = NULL;
 762
 763                                 /* Pull entries off end of queue so list always null terminated */
 764                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 765                                         ;
 766                                 }
 767                                 refarray = lc->lconn_rebind_queue[j-1];
 768                                 lc->lconn_rebind_queue[j-1] = NULL;
 769                                 /* we pulled off last entry from queue, free queue */
 770                                 if ( j == 1 ) {
 771                                         LDAP_FREE( lc->lconn_rebind_queue);
 772                                         lc->lconn_rebind_queue = NULL;
 773                                 }
 774                                 /* restart the loop the with new referral list */
 775                                 i = -1;
 776                                 continue;
 777                         }
 778                         break; /* referral followed, break out of for loop */
 779                 }
 780         } /* end for loop */
 781 done:
 782         LDAP_VFREE(refarray);
 783         ldap_free_urllist(srv);
 784         LDAP_FREE( *errstrp );
 785
 786         if( rc == 0) {
 787                 *errstrp = NULL;
 788                 LDAP_FREE( unfollowed );
 789                 return count;
 790         } else {
 791                 ld->ld_errno = LDAP_REFERRAL;
 792                 *errstrp = unfollowed;
 793                 return rc;
 794         }
 795 }
 796
 797 /*
 798  * XXX merging of errors in this routine needs to be improved
 799  */
 800 int
 801 ldap_chase_referrals( LDAP *ld,
 802         LDAPRequest *lr,
 803         char **errstrp,
 804         int sref,
 805         int *hadrefp )
 806 {
 807         int             rc, count, len;
 808         char            *p, *ref, *unfollowed;
 809         LDAPRequest     *origreq;
 810         LDAPURLDesc     *srv;
 811         BerElement      *ber;
 812         LDAPreqinfo  rinfo;
 813
 814         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
 815
 816         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 817         *hadrefp = 0;
 818
 819         if ( *errstrp == NULL ) {
 820                 return( 0 );
 821         }
 822
 823         len = strlen( *errstrp );
 824         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
 825                 if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
 826                         *p = '\0';
 827                         p += LDAP_REF_STR_LEN;
 828                         break;
 829                 }
 830         }
 831
 832         if ( len < LDAP_REF_STR_LEN ) {
 833                 return( 0 );
 834         }
 835
 836         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 837                 Debug( LDAP_DEBUG_ANY,
 838                     "more than %d referral hops (dropping)\n",
 839                     ld->ld_refhoplimit, 0, 0 );
 840                     /* XXX report as error in ld->ld_errno? */
 841                     return( 0 );
 842         }
 843
 844         /* find original request */
 845         for ( origreq = lr; origreq->lr_parent != NULL;
 846              origreq = origreq->lr_parent ) {
 847                 /* empty */;
 848         }
 849
 850         unfollowed = NULL;
 851         rc = count = 0;
 852
 853         /* parse out & follow referrals */
 854         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
 855                 if (( p = strchr( ref, '\n' )) != NULL ) {
 856                         *p++ = '\0';
 857                 } else {
 858                         p = NULL;
 859                 }
 860
 861                 rc = ldap_url_parse_ext( ref, &srv );
 862
 863                 if ( rc != LDAP_URL_SUCCESS ) {
 864                         Debug( LDAP_DEBUG_TRACE,
 865                             "ignoring unknown referral <%s>\n", ref, 0, 0 );
 866                         rc = ldap_append_referral( ld, &unfollowed, ref );
 867                         *hadrefp = 1;
 868                         continue;
 869                 }
 870
 871                 if( srv->lud_dn != NULL && srv->lud_dn == '\0' ) {
 872                         LDAP_FREE( srv->lud_dn );
 873                         srv->lud_dn = NULL;
 874                 }
 875
 876                 Debug( LDAP_DEBUG_TRACE,
 877                     "chasing LDAP referral: <%s>\n", ref, 0, 0 );
 878
 879                 *hadrefp = 1;
 880
 881                 ber = re_encode_request( ld, origreq->lr_ber,
 882                     ++ld->ld_msgid, sref, srv, &rinfo.ri_request );
 883
 884                 if( ber == NULL ) {
 885                         return -1 ;
 886                 }
 887
 888                 /* copy the complete referral for rebind process */
 889                 rinfo.ri_url = LDAP_STRDUP( ref );
 890
 891                 rinfo.ri_msgid = origreq->lr_origid;
 892
 893                 rc = ldap_send_server_request( ld, ber, ld->ld_msgid,
 894                     lr, srv, NULL, &rinfo );
 895
 896                 LDAP_FREE( rinfo.ri_url );
 897
 898                 if( rc >= 0 ) {
 899                         ++count;
 900                 } else {
 901                         Debug( LDAP_DEBUG_ANY,
 902                             "Unable to chase referral (%s)\n",
 903                             ldap_err2string( ld->ld_errno ), 0, 0 );
 904                         rc = ldap_append_referral( ld, &unfollowed, ref );
 905                 }
 906
 907                 ldap_free_urllist(srv);
 908         }
 909
 910         LDAP_FREE( *errstrp );
 911         *errstrp = unfollowed;
 912
 913         return(( rc == 0 ) ? count : rc );
 914 }
 915
 916
 917 int
 918 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
 919 {
 920         int     first;
 921
 922         if ( *referralsp == NULL ) {
 923                 first = 1;
 924                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
 925                     + 1 );
 926         } else {
 927                 first = 0;
 928                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
 929                     strlen( *referralsp ) + strlen( s ) + 2 );
 930         }
 931
 932         if ( *referralsp == NULL ) {
 933                 ld->ld_errno = LDAP_NO_MEMORY;
 934                 return( -1 );
 935         }
 936
 937         if ( first ) {
 938                 strcpy( *referralsp, LDAP_REF_STR );
 939         } else {
 940                 strcat( *referralsp, "\n" );
 941         }
 942         strcat( *referralsp, s );
 943
 944         return( 0 );
 945 }
 946
 947
 948
 949 static BerElement *
 950 re_encode_request( LDAP *ld,
 951         BerElement *origber,
 952         ber_int_t msgid,
 953         int sref,
 954         LDAPURLDesc *srv,
 955         int *type )
 956 {
 957         /*
 958          * XXX this routine knows way too much about how the lber library works!
 959          */
 960         ber_int_t       along;
 961         ber_tag_t       tag;
 962         ber_int_t       ver;
 963         ber_int_t       scope;
 964         int             rc;
 965         BerElement      tmpber, *ber;
 966         char            *orig_dn;
 967         char            *dn;
 968
 969         Debug( LDAP_DEBUG_TRACE,
 970             "re_encode_request: new msgid %ld, new dn <%s>\n",
 971             (long) msgid,
 972                 ( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
 973
 974         tmpber = *origber;
 975
 976         /*
 977          * all LDAP requests are sequences that start with a message id.
 978          * For all except delete, this is followed by a sequence that is
 979          * tagged with the operation code.  For delete, the provided DN
 980          * is not wrapped by a sequence.
 981          */
 982         rc = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
 983
 984         if ( rc == LBER_ERROR ) {
 985                 ld->ld_errno = LDAP_DECODING_ERROR;
 986                 return( NULL );
 987         }
 988
 989         assert( tag != 0);
 990         if ( tag == LDAP_REQ_BIND ) {
 991                 /* bind requests have a version number before the DN & other stuff */
 992                 rc = ber_scanf( &tmpber, "{ia" /*}*/, &ver, &orig_dn );
 993
 994         } else if ( tag == LDAP_REQ_DELETE ) {
 995                 /* delete requests don't have a DN wrapping sequence */
 996                 rc = ber_scanf( &tmpber, "a", &orig_dn );
 997
 998         } else if ( tag == LDAP_REQ_SEARCH ) {
 999                 /* search requests need to be re-scope-ed */
1000                 rc = ber_scanf( &tmpber, "{ae" /*"}"*/, &orig_dn, &scope );
1001
1002                 if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
1003                         /* use the scope provided in reference */
1004                         scope = srv->lud_scope;
1005
1006                 } else if ( sref && scope != LDAP_SCOPE_SUBTREE ) {
1007                         /* use scope implied by previous operation */
1008                         /*   base -> base */
1009                         /*   one -> base */
1010                         /*   subtree -> subtree */
1011                         scope = LDAP_SCOPE_BASE;
1012                 }
1013
1014         } else {
1015                 rc = ber_scanf( &tmpber, "{a" /*}*/, &orig_dn );
1016         }
1017
1018         if( rc == LBER_ERROR ) {
1019                 ld->ld_errno = LDAP_DECODING_ERROR;
1020                 return NULL;
1021         }
1022
1023         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1024                 return NULL;
1025         }
1026
1027         if ( srv->lud_dn == NULL ) {
1028                 dn = orig_dn;
1029         } else {
1030                 dn = srv->lud_dn;
1031         }
1032
1033         if ( tag == LDAP_REQ_BIND ) {
1034                 rc = ber_printf( ber, "{it{is" /*}}*/, msgid, tag, ver, dn );
1035         } else if ( tag == LDAP_REQ_DELETE ) {
1036                 rc = ber_printf( ber, "{itsN}", msgid, tag, dn );
1037         } else if ( tag == LDAP_REQ_SEARCH ) {
1038                 rc = ber_printf( ber, "{it{se" /*}}*/, msgid, tag, dn, scope );
1039         } else {
1040                 rc = ber_printf( ber, "{it{s" /*}}*/, msgid, tag, dn );
1041         }
1042
1043         LDAP_FREE( orig_dn );
1044
1045         if ( rc == -1 ) {
1046                 ld->ld_errno = LDAP_ENCODING_ERROR;
1047                 ber_free( ber, 1 );
1048                 return NULL;
1049         }
1050
1051         if ( tag != LDAP_REQ_DELETE && (
1052                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1053                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1054             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1055         {
1056                 ld->ld_errno = LDAP_ENCODING_ERROR;
1057                 ber_free( ber, 1 );
1058                 return NULL;
1059         }
1060
1061 #ifdef LDAP_DEBUG
1062         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1063                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1064                     0, 0, 0 );
1065                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1066         }
1067 #endif /* LDAP_DEBUG */
1068
1069         *type = tag;    /* return request type */
1070         return ber;
1071 }
1072
1073
1074 LDAPRequest *
1075 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1076 {
1077         LDAPRequest     *lr;
1078
1079         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1080                 if( lr->lr_status == LDAP_REQST_COMPLETED ) {
1081                         continue;       /* Skip completed requests */
1082                 }
1083                 if ( msgid == lr->lr_msgid ) {
1084                         break;
1085                 }
1086         }
1087
1088         return( lr );
1089 }
1090
1091