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
  49 static BerElement *re_encode_request LDAP_P((
  50         LDAP *ld,
  51         BerElement *origber,
  52     ber_int_t msgid,
  53         char **dnp,
  54         int      *type));
  55
  56
  57 BerElement *
  58 ldap_alloc_ber_with_options( LDAP *ld )
  59 {
  60         BerElement      *ber;
  61
  62     if (( ber = ber_alloc_t( ld->ld_lberoptions )) == NULL ) {
  63                 ld->ld_errno = LDAP_NO_MEMORY;
  64         }
  65
  66         return( ber );
  67 }
  68
  69
  70 void
  71 ldap_set_ber_options( LDAP *ld, BerElement *ber )
  72 {
  73         ber->ber_options = ld->ld_lberoptions;
  74 }
  75
  76
  77 ber_int_t
  78 ldap_send_initial_request(
  79         LDAP *ld,
  80         ber_tag_t msgtype,
  81         const char *dn,
  82         BerElement *ber )
  83 {
  84         LDAPURLDesc     *servers;
  85         int rc;
  86
  87         Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
  88
  89         if ( ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, NULL ) == -1 ) {
  90                 /* not connected yet */
  91                 int rc = ldap_open_defconn( ld );
  92
  93                 if( rc < 0 ) {
  94                         ber_free( ber, 1 );
  95                         return( -1 );
  96                 }
  97
  98                 Debug( LDAP_DEBUG_TRACE,
  99                         "ldap_delayed_open successful, ld_host is %s\n",
 100                         ( ld->ld_host == NULL ) ? "(null)" : ld->ld_host, 0, 0 );
 101         }
 102
 103         {
 104                 /*
 105                  * use of DNS is turned off or this is an X.500 DN...
 106                  * use our default connection
 107                  */
 108                 servers = NULL;
 109         }
 110
 111         rc = ldap_send_server_request( ld, ber, ld->ld_msgid, NULL,
 112                                                                         servers, NULL, NULL );
 113         if (servers)
 114                 ldap_free_urllist(servers);
 115         return(rc);
 116 }
 117
 118
 119
 120 int
 121 ldap_send_server_request(
 122         LDAP *ld,
 123         BerElement *ber,
 124         ber_int_t msgid,
 125         LDAPRequest *parentreq,
 126         LDAPURLDesc *srvlist,
 127         LDAPConn *lc,
 128         LDAPreqinfo *bind )
 129 {
 130         LDAPRequest     *lr;
 131         int incparent;
 132
 133         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 134
 135         incparent = 0;
 136         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 137
 138         if ( lc == NULL ) {
 139                 if ( srvlist == NULL ) {
 140                         lc = ld->ld_defconn;
 141                 } else {
 142                         if (( lc = find_connection( ld, srvlist, 1 )) ==
 143                             NULL ) {
 144                                 if ( (bind != NULL) && (parentreq != NULL) ) {
 145                                         /* Remember the bind in the parent */
 146                                         incparent = 1;
 147                                         ++parentreq->lr_outrefcnt;
 148                                 }
 149                                 lc = ldap_new_connection( ld, srvlist, 0, 1, bind );
 150                         }
 151                 }
 152         }
 153
 154         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 155                 ber_free( ber, 1 );
 156                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 157                         ld->ld_errno = LDAP_SERVER_DOWN;
 158                 }
 159                 if ( incparent ) {
 160                         /* Forget about the bind */
 161                         --parentreq->lr_outrefcnt;
 162                 }
 163                 return( -1 );
 164         }
 165
 166         use_connection( ld, lc );
 167         if (( lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ))) ==
 168             NULL ) {
 169                 ld->ld_errno = LDAP_NO_MEMORY;
 170                 ldap_free_connection( ld, lc, 0, 0 );
 171                 ber_free( ber, 1 );
 172                 if ( incparent ) {
 173                         /* Forget about the bind */
 174                         --parentreq->lr_outrefcnt;
 175                 }
 176                 return( -1 );
 177         }
 178         lr->lr_msgid = msgid;
 179         lr->lr_status = LDAP_REQST_INPROGRESS;
 180         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 181         lr->lr_ber = ber;
 182         lr->lr_conn = lc;
 183         if ( parentreq != NULL ) {      /* sub-request */
 184                 if ( !incparent ) {
 185                         /* Increment if we didn't do it before the bind */
 186                         ++parentreq->lr_outrefcnt;
 187                 }
 188                 lr->lr_origid = parentreq->lr_origid;
 189                 lr->lr_parentcnt = parentreq->lr_parentcnt + 1;
 190                 lr->lr_parent = parentreq;
 191                 lr->lr_refnext = parentreq->lr_refnext;
 192                 parentreq->lr_refnext = lr;
 193         } else {                        /* original request */
 194                 lr->lr_origid = lr->lr_msgid;
 195         }
 196
 197         if (( lr->lr_next = ld->ld_requests ) != NULL ) {
 198                 lr->lr_next->lr_prev = lr;
 199         }
 200         ld->ld_requests = lr;
 201         lr->lr_prev = NULL;
 202
 203         if ( ber_flush( lc->lconn_sb, ber, 0 ) != 0 ) {
 204 #ifdef notyet
 205                 if ( errno == EWOULDBLOCK ) {
 206                         /* need to continue write later */
 207                         lr->lr_status = LDAP_REQST_WRITING;
 208                         ldap_mark_select_write( ld, lc->lconn_sb );
 209                 } else {
 210 #else /* notyet */
 211                         ld->ld_errno = LDAP_SERVER_DOWN;
 212                         ldap_free_request( ld, lr );
 213                         ldap_free_connection( ld, lc, 0, 0 );
 214                         return( -1 );
 215 #endif /* notyet */
 216 #ifdef notyet
 217                 }
 218 #endif /* notyet */
 219         } else {
 220                 if ( parentreq == NULL ) {
 221                         ber->ber_end = ber->ber_ptr;
 222                         ber->ber_ptr = ber->ber_buf;
 223                 }
 224
 225                 /* sent -- waiting for a response */
 226                 ldap_mark_select_read( ld, lc->lconn_sb );
 227         }
 228
 229         ld->ld_errno = LDAP_SUCCESS;
 230         return( msgid );
 231 }
 232
 233 LDAPConn *
 234 ldap_new_connection( LDAP *ld, LDAPURLDesc *srvlist, int use_ldsb,
 235         int connect, LDAPreqinfo *bind )
 236 {
 237         LDAPConn        *lc;
 238         LDAPURLDesc     *srv;
 239         Sockbuf         *sb = NULL;
 240
 241         Debug( LDAP_DEBUG_TRACE, "ldap_new_connection\n", 0, 0, 0 );
 242         /*
 243          * make a new LDAP server connection
 244          * XXX open connection synchronously for now
 245          */
 246         if (( lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ))) == NULL ||
 247             ( !use_ldsb && ( (sb = ber_sockbuf_alloc()) == NULL ))) {
 248                 if ( lc != NULL ) {
 249                         LDAP_FREE( (char *)lc );
 250                 }
 251                 ld->ld_errno = LDAP_NO_MEMORY;
 252                 return( NULL );
 253         }
 254
 255         lc->lconn_sb = ( use_ldsb ) ? ld->ld_sb : sb;
 256
 257         if ( connect ) {
 258                 for ( srv = srvlist; srv != NULL; srv = srv->lud_next ) {
 259                         if ( ldap_int_open_connection( ld, lc, srv, 0 ) != -1 ) {
 260                                 break;
 261                         }
 262                 }
 263
 264                 if ( srv == NULL ) {
 265                         if ( !use_ldsb ) {
 266                                 ber_sockbuf_free( lc->lconn_sb );
 267                         }
 268                     LDAP_FREE( (char *)lc );
 269                     ld->ld_errno = LDAP_SERVER_DOWN;
 270                     return( NULL );
 271                 }
 272
 273                 lc->lconn_server = ldap_url_dup(srv);
 274         }
 275
 276         lc->lconn_status = LDAP_CONNST_CONNECTED;
 277         lc->lconn_next = ld->ld_conns;
 278         ld->ld_conns = lc;
 279
 280         /*
 281          * XXX for now, we always do a synchronous bind.  This will have
 282          * to change in the long run...
 283          */
 284         if ( bind != NULL) {
 285                 int             err = 0;
 286                 LDAPConn        *savedefconn;
 287
 288                 /* Set flag to prevent additional referrals from being processed on this
 289                  * connection until the bind has completed
 290                  */
 291                 lc->lconn_rebind_inprogress = 1;
 292                 /* V3 rebind function */
 293                 if ( ld->ld_rebindproc != NULL) {
 294                         LDAPURLDesc     *srvfunc;
 295                         if( ( srvfunc = ldap_url_dup( srvlist)) == NULL) {
 296                                 ld->ld_errno = LDAP_NO_MEMORY;
 297                                 err = -1;
 298                         } else {
 299                                 savedefconn = ld->ld_defconn;
 300                                 ++lc->lconn_refcnt;     /* avoid premature free */
 301                                 ld->ld_defconn = lc;
 302
 303                                 Debug( LDAP_DEBUG_TRACE, "Call application rebindproc\n", 0, 0, 0);
 304                                 err = (*ld->ld_rebindproc)( ld, bind->ri_url, bind->ri_request, bind->ri_msgid);
 305
 306                                 ld->ld_defconn = savedefconn;
 307                                 --lc->lconn_refcnt;
 308
 309                                 if( err != 0) {
 310                                 err = -1;
 311                                         ldap_free_connection( ld, lc, 1, 0 );
 312                                         lc = NULL;
 313                         }
 314                                 ldap_free_urldesc( srvfunc);
 315                 }
 316                 } else {
 317                         savedefconn = ld->ld_defconn;
 318                         ++lc->lconn_refcnt;     /* avoid premature free */
 319                         ld->ld_defconn = lc;
 320
 321                         Debug( LDAP_DEBUG_TRACE, "anonymous rebind via ldap_bind_s\n", 0, 0, 0);
 322                         if ( ldap_bind_s( ld, "", "", LDAP_AUTH_SIMPLE ) != LDAP_SUCCESS ) {
 323                                 err = -1;
 324                         }
 325                         ld->ld_defconn = savedefconn;
 326                         --lc->lconn_refcnt;
 327
 328                 if ( err != 0 ) {
 329                         ldap_free_connection( ld, lc, 1, 0 );
 330                         lc = NULL;
 331                 }
 332         }
 333                 if( lc != NULL)
 334                         lc->lconn_rebind_inprogress = 0;
 335         }
 336
 337         return( lc );
 338 }
 339
 340
 341 static LDAPConn *
 342 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 343 /*
 344  * return an existing connection (if any) to the server srv
 345  * if "any" is non-zero, check for any server in the "srv" chain
 346  */
 347 {
 348         LDAPConn        *lc;
 349         LDAPURLDesc     *ls;
 350
 351         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 352                 for ( ls = srv; ls != NULL; ls = ls->lud_next ) {
 353                         if ( lc->lconn_server->lud_host != NULL &&
 354                             ls->lud_host != NULL && strcasecmp(
 355                             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  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
 579  *  (OUT) hadrefp = 1 if sucessfully followed referral
 580  *
 581  * Return value - number of referrals followed
 582  */
 583 int
 584 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, char **errstrp, int *hadrefp )
 585 {
 586         char            *unfollowed;
 587         int                      unfollowedcnt = 0;
 588         LDAPRequest     *origreq;
 589         LDAPURLDesc     *srv = NULL;
 590         BerElement      *ber;
 591         char            **refarray = NULL;
 592         LDAPConn        *lc;
 593         int                      rc, count, i, j;
 594         LDAPreqinfo  rinfo;
 595
 596         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 597         *hadrefp = 0;
 598
 599         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
 600
 601         unfollowed = NULL;
 602         rc = count = 0;
 603
 604         /* If no referrals in array, return */
 605         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
 606                 rc = 0;
 607                 goto done;
 608         }
 609
 610         /* Check for hop limit exceeded */
 611         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 612                 Debug( LDAP_DEBUG_ANY,
 613                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
 614                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
 615             rc = -1;
 616                 goto done;
 617         }
 618
 619         /* find original request */
 620         for ( origreq = lr; origreq->lr_parent != NULL; origreq = origreq->lr_parent ) {
 621                 ;
 622         }
 623
 624         refarray = refs;
 625         refs = NULL;
 626         /* parse out & follow referrals */
 627         for( i=0; refarray[i] != NULL; i++) {
 628                 /* Parse the referral URL */
 629                 if (( rc = ldap_url_parse( refarray[i], &srv)) != LDAP_SUCCESS) {
 630                         ld->ld_errno = rc;
 631                         rc = -1;
 632                         goto done;
 633                 }
 634
 635                 /* treat ldap://hostpart and ldap://hostpart/ the same */
 636                 if ( srv->lud_dn && srv->lud_dn[0] == '\0' ) {
 637                         LDAP_FREE( srv->lud_dn );
 638                         srv->lud_dn = NULL;
 639                 }
 640
 641                 /* check connection for re-bind in progress */
 642                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
 643                         if( lc->lconn_rebind_inprogress) {
 644                                 /* We are already chasing a referral or search reference and a
 645                                  * bind on that connection is in progress.  We must queue
 646                                  * referrals on that connection, so we don't get a request
 647                                  * going out before the bind operation completes. This happens
 648                                  * if two search references come in one behind the other
 649                                  * for the same server with different contexts.
 650                                  */
 651                                 Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals: queue referral \"%s\"\n",
 652                                         refarray[i], 0, 0);
 653                                 if( lc->lconn_rebind_queue == NULL ) {
 654                                         /* Create a referral list */
 655                                         if( (lc->lconn_rebind_queue = (char ***)LDAP_MALLOC( sizeof(void *) * 2)) == NULL) {
 656                                                 ld->ld_errno = LDAP_NO_MEMORY;
 657                                                 rc = -1;
 658                                                 goto done;
 659                                         }
 660                                         lc->lconn_rebind_queue[0] = refarray;
 661                                         lc->lconn_rebind_queue[1] = NULL;
 662                                         refarray = NULL;
 663                                 } else {
 664                                         /* Count how many referral arrays we already have */
 665                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 666                                                 ;
 667                                         }
 668                                         /* Add the new referral to the list */
 669                                         if( (lc->lconn_rebind_queue = (char ***)LDAP_REALLOC(
 670                                                         lc->lconn_rebind_queue, sizeof(void *) * (j + 2))) == NULL) {
 671                                                 ld->ld_errno = LDAP_NO_MEMORY;
 672                                                 rc = -1;
 673                                                 goto done;
 674                                         }
 675                                         lc->lconn_rebind_queue[j] = refarray;
 676                                         lc->lconn_rebind_queue[j+1] = NULL;
 677                                         refarray = NULL;
 678                                 }
 679                                 /* We have queued the referral/reference, now just return */
 680                                 rc = 0;
 681                                 *hadrefp = 1;
 682                                 count = 1; /* Pretend we already followed referral */
 683                                 goto done;
 684                         }
 685                 }
 686                 /* Re-encode the request with the new starting point of the search.
 687                  * Note: In the future we also need to replace the filter if one
 688                  * was provided with the search reference
 689                  */
 690                 if (( ber = re_encode_request( ld, origreq->lr_ber,
 691                             ++ld->ld_msgid, &srv->lud_dn, &rinfo.ri_request )) == NULL ) {
 692                         ld->ld_errno = LDAP_ENCODING_ERROR;
 693                         rc = -1;
 694                         goto done;
 695                 }
 696
 697                 Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
 698                         lr->lr_msgid, refarray[i], 0);
 699
 700                 /* Send the new request to the server - may require a bind */
 701                 rinfo.ri_msgid = origreq->lr_origid;
 702                 rinfo.ri_url = refarray[i];
 703                 if ( (rc = ldap_send_server_request( ld, ber, ld->ld_msgid,
 704                         origreq, srv, NULL, &rinfo )) < 0 ) {
 705                         /* Failure, try next referral in the list */
 706                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%s)\n",
 707                                 refarray[i], ldap_err2string( ld->ld_errno ), 0);
 708                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i]);
 709                         ldap_free_urllist(srv);
 710                         srv = NULL;
 711                 } else {
 712                         /* Success, no need to try this referral list further */
 713                         rc = 0;
 714                         ++count;
 715                         *hadrefp = 1;
 716
 717                         /* check if there is a queue of referrals that came in during bind */
 718                         if( lc == NULL) {
 719                                 if (( lc = find_connection( ld, srv, 1 )) == NULL ) {
 720                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
 721                                         rc = -1;
 722                                         goto done;
 723                                 }
 724                         }
 725
 726                         if( lc->lconn_rebind_queue != NULL) {
 727                                 /* Release resources of previous list */
 728                                 LDAP_VFREE(refarray);
 729                                 refarray = NULL;
 730                                 ldap_free_urllist(srv);
 731                                 srv = NULL;
 732
 733                                 /* Pull entries off end of queue so list always null terminated */
 734                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 735                                         ;
 736                                 }
 737                                 refarray = lc->lconn_rebind_queue[j-1];
 738                                 lc->lconn_rebind_queue[j-1] = NULL;
 739                                 /* we pulled off last entry from queue, free queue */
 740                                 if ( j == 1 ) {
 741                                         LDAP_FREE( lc->lconn_rebind_queue);
 742                                         lc->lconn_rebind_queue = NULL;
 743                                 }
 744                                 /* restart the loop the with new referral list */
 745                                 i = -1;
 746                                 continue;
 747                         }
 748                         break; /* referral followed, break out of for loop */
 749                 }
 750         } /* end for loop */
 751 done:
 752         LDAP_VFREE(refarray);
 753         ldap_free_urllist(srv);
 754         LDAP_FREE( *errstrp );
 755
 756         if( rc == 0) {
 757                 *errstrp = NULL;
 758                 LDAP_FREE( unfollowed );
 759                 return count;
 760         } else {
 761                 ld->ld_errno = LDAP_REFERRAL;
 762                 *errstrp = unfollowed;
 763                 return rc;
 764         }
 765 }
 766
 767 /*
 768  * XXX merging of errors in this routine needs to be improved
 769  */
 770 int
 771 ldap_chase_referrals( LDAP *ld, LDAPRequest *lr, char **errstrp, int *hadrefp )
 772 {
 773         int             rc, count, len, newdn;
 774         char            *p, *ports, *ref, *tmpref, *refdn, *unfollowed;
 775         LDAPRequest     *origreq;
 776         LDAPURLDesc     *srv;
 777         BerElement      *ber;
 778         LDAPreqinfo  rinfo;
 779
 780         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
 781
 782         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 783         *hadrefp = 0;
 784
 785         if ( *errstrp == NULL ) {
 786                 return( 0 );
 787         }
 788
 789         len = strlen( *errstrp );
 790         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
 791                 if (( *p == 'R' || *p == 'r' ) && strncasecmp( p,
 792                     LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
 793                         *p = '\0';
 794                         p += LDAP_REF_STR_LEN;
 795                         break;
 796                 }
 797         }
 798
 799         if ( len < LDAP_REF_STR_LEN ) {
 800                 return( 0 );
 801         }
 802
 803         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 804                 Debug( LDAP_DEBUG_ANY,
 805                     "more than %d referral hops (dropping)\n",
 806                     ld->ld_refhoplimit, 0, 0 );
 807                     /* XXX report as error in ld->ld_errno? */
 808                     return( 0 );
 809         }
 810
 811         /* find original request */
 812         for ( origreq = lr; origreq->lr_parent != NULL;
 813              origreq = origreq->lr_parent ) {
 814                 ;
 815         }
 816
 817         unfollowed = NULL;
 818         rc = count = 0;
 819
 820         /* parse out & follow referrals */
 821         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
 822
 823                 if (( p = strchr( ref, '\n' )) != NULL ) {
 824                         *p++ = '\0';
 825                 } else {
 826                         p = NULL;
 827                 }
 828
 829                 ldap_pvt_hex_unescape( ref );
 830                 len = strlen( ref );
 831
 832                 /* FIXME: we should use the URL Parser */
 833
 834                 if ( len > LDAP_LDAP_REF_STR_LEN && strncasecmp( ref,
 835                     LDAP_LDAP_REF_STR, LDAP_LDAP_REF_STR_LEN ) == 0 ) {
 836                         Debug( LDAP_DEBUG_TRACE,
 837                             "chasing LDAP referral: <%s>\n", ref, 0, 0 );
 838                         tmpref = ref + LDAP_LDAP_REF_STR_LEN;
 839                 } else {
 840                         Debug( LDAP_DEBUG_TRACE,
 841                             "ignoring unknown referral <%s>\n", ref, 0, 0 );
 842                         rc = ldap_append_referral( ld, &unfollowed, ref );
 843                         *hadrefp = 1;
 844                         continue;
 845                 }
 846
 847                 /* copy the complete referral for rebind process */
 848                 rinfo.ri_url = LDAP_STRDUP( ref );
 849
 850                 *hadrefp = 1;
 851
 852                 if (( refdn = strchr( tmpref, '/' )) != NULL ) {
 853                         *refdn++ = '\0';
 854                         newdn = refdn[0] != '?' && refdn[0] != '\0';
 855                         if( !newdn ) refdn = NULL;
 856                 } else {
 857                         newdn = 0;
 858                 }
 859
 860                 if (( ber = re_encode_request( ld, origreq->lr_ber,
 861                     ++ld->ld_msgid, &refdn, &rinfo.ri_request )) == NULL ) {
 862                         return( -1 );
 863                 }
 864
 865                         if (( srv = (LDAPURLDesc *)LDAP_CALLOC( 1,
 866                             sizeof( LDAPURLDesc ))) == NULL ) {
 867                                 ber_free( ber, 1 );
 868                                 ld->ld_errno = LDAP_NO_MEMORY;
 869                                 return( -1 );
 870                         }
 871
 872                         if (( srv->lud_scheme = LDAP_STRDUP("ldap")) == NULL ) {
 873                                 LDAP_FREE( (char *)srv );
 874                                 ber_free( ber, 1 );
 875                                 ld->ld_errno = LDAP_NO_MEMORY;
 876                                 return( -1 );
 877                         }
 878
 879                         if (( srv->lud_host = LDAP_STRDUP( tmpref )) == NULL ) {
 880                                 LDAP_FREE( (char *)srv );
 881                                 ber_free( ber, 1 );
 882                                 ld->ld_errno = LDAP_NO_MEMORY;
 883                                 return( -1 );
 884                         }
 885
 886                         if (( ports = strchr( srv->lud_host, ':' )) != NULL ) {
 887                                 *ports++ = '\0';
 888                                 srv->lud_port = atoi( ports );
 889                         } else {
 890                                 srv->lud_port = (LDAP_INT_GLOBAL_OPT())->ldo_defport;
 891                         }
 892
 893                 rinfo.ri_msgid = origreq->lr_origid;
 894                 if ( srv != NULL && ldap_send_server_request( ld, ber, ld->ld_msgid,
 895                     lr, srv, NULL, &rinfo ) >= 0 ) {
 896                         ++count;
 897                 } else {
 898                         Debug( LDAP_DEBUG_ANY,
 899                             "Unable to chase referral (%s)\n",
 900                             ldap_err2string( ld->ld_errno ), 0, 0 );
 901                         rc = ldap_append_referral( ld, &unfollowed, ref );
 902                 }
 903                 LDAP_FREE( rinfo.ri_url);
 904
 905                 if (srv != NULL)
 906                         ldap_free_urllist(srv);
 907
 908                 if ( !newdn && refdn != NULL ) {
 909                         LDAP_FREE( refdn );
 910                 }
 911         }
 912
 913         LDAP_FREE( *errstrp );
 914         *errstrp = unfollowed;
 915
 916         return(( rc == 0 ) ? count : rc );
 917 }
 918
 919
 920 int
 921 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
 922 {
 923         int     first;
 924
 925         if ( *referralsp == NULL ) {
 926                 first = 1;
 927                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
 928                     + 1 );
 929         } else {
 930                 first = 0;
 931                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
 932                     strlen( *referralsp ) + strlen( s ) + 2 );
 933         }
 934
 935         if ( *referralsp == NULL ) {
 936                 ld->ld_errno = LDAP_NO_MEMORY;
 937                 return( -1 );
 938         }
 939
 940         if ( first ) {
 941                 strcpy( *referralsp, LDAP_REF_STR );
 942         } else {
 943                 strcat( *referralsp, "\n" );
 944         }
 945         strcat( *referralsp, s );
 946
 947         return( 0 );
 948 }
 949
 950
 951
 952 static BerElement *
 953 re_encode_request( LDAP *ld, BerElement *origber, ber_int_t msgid, char **dnp, int *type )
 954 {
 955 /*
 956  * XXX this routine knows way too much about how the lber library works!
 957  */
 958         ber_int_t       along;
 959         ber_tag_t       tag;
 960         ber_int_t       ver;
 961         int             rc;
 962         BerElement      tmpber, *ber;
 963         char            *orig_dn;
 964
 965         Debug( LDAP_DEBUG_TRACE,
 966             "re_encode_request: new msgid %ld, new dn <%s>\n",
 967             (long) msgid, ( *dnp == NULL ) ? "NONE" : *dnp, 0 );
 968
 969         tmpber = *origber;
 970
 971         /*
 972          * all LDAP requests are sequences that start with a message id.
 973          * For all except delete, this is followed by a sequence that is
 974          * tagged with the operation code.  For delete, the provided DN
 975          * is not wrapped by a sequence.
 976          */
 977         rc = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
 978
 979         if ( rc == LBER_ERROR ) {
 980                 ld->ld_errno = LDAP_DECODING_ERROR;
 981                 return( NULL );
 982         }
 983
 984         assert( tag != 0);
 985         if ( tag == LDAP_REQ_BIND ) {
 986                 /* bind requests have a version number before the DN & other stuff */
 987                 rc = ber_scanf( &tmpber, "{ia" /*}*/, &ver, &orig_dn );
 988
 989         } else if ( tag == LDAP_REQ_DELETE ) {
 990                 /* delete requests don't have a DN wrapping sequence */
 991                 rc = ber_scanf( &tmpber, "a", &orig_dn );
 992
 993         } else {
 994                 rc = ber_scanf( &tmpber, "{a" /*}*/, &orig_dn );
 995         }
 996
 997         if( rc == LBER_ERROR ) {
 998                 ld->ld_errno = LDAP_DECODING_ERROR;
 999                 return NULL;
1000         }
1001
1002         if ( *dnp == NULL ) {
1003                 *dnp = orig_dn;
1004         } else {
1005                 LDAP_FREE( orig_dn );
1006         }
1007
1008         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1009                 return( NULL );
1010         }
1011
1012         if ( tag == LDAP_REQ_BIND ) {
1013                 rc = ber_printf( ber, "{it{is" /*}}*/, msgid, tag, ver, *dnp );
1014         } else if ( tag == LDAP_REQ_DELETE ) {
1015                 rc = ber_printf( ber, "{itsN}", msgid, tag, *dnp );
1016         } else {
1017                 rc = ber_printf( ber, "{it{s" /*}}*/, msgid, tag, *dnp );
1018         }
1019
1020         if ( rc == -1 ) {
1021                 ld->ld_errno = LDAP_ENCODING_ERROR;
1022                 ber_free( ber, 1 );
1023                 return( NULL );
1024         }
1025
1026         if ( tag != LDAP_REQ_DELETE && (
1027                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1028                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1029             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1030         {
1031                 ld->ld_errno = LDAP_ENCODING_ERROR;
1032                 ber_free( ber, 1 );
1033                 return( NULL );
1034         }
1035
1036 #ifdef LDAP_DEBUG
1037         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1038                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1039                     0, 0, 0 );
1040                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1041         }
1042 #endif /* LDAP_DEBUG */
1043
1044         *type = tag;    /* return request type */
1045         return( ber );
1046 }
1047
1048
1049 LDAPRequest *
1050 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1051 {
1052         LDAPRequest     *lr;
1053
1054         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1055                 if( lr->lr_status == LDAP_REQST_COMPLETED ) {
1056                         continue;       /* Skip completed requests */
1057                 }
1058                 if ( msgid == lr->lr_msgid ) {
1059                         break;
1060                 }
1061         }
1062
1063         return( lr );
1064 }
1065
1066