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_open_defconn: successful\n",
  99                         0, 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_rebind_proc != 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 rebind_proc\n", 0, 0, 0);
 303                                 err = (*ld->ld_rebind_proc)( ld,
 304                                         bind->ri_url, bind->ri_request, bind->ri_msgid,
 305                                         ld->ld_rebind_params );
 306
 307                                 ld->ld_defconn = savedefconn;
 308                                 --lc->lconn_refcnt;
 309
 310                                 if( err != 0) {
 311                                 err = -1;
 312                                         ldap_free_connection( ld, lc, 1, 0 );
 313                                         lc = NULL;
 314                         }
 315                                 ldap_free_urldesc( srvfunc);
 316                 }
 317                 } else {
 318                         savedefconn = ld->ld_defconn;
 319                         ++lc->lconn_refcnt;     /* avoid premature free */
 320                         ld->ld_defconn = lc;
 321
 322                         Debug( LDAP_DEBUG_TRACE, "anonymous rebind via ldap_bind_s\n", 0, 0, 0);
 323                         if ( ldap_bind_s( ld, "", "", LDAP_AUTH_SIMPLE ) != LDAP_SUCCESS ) {
 324                                 err = -1;
 325                         }
 326                         ld->ld_defconn = savedefconn;
 327                         --lc->lconn_refcnt;
 328
 329                 if ( err != 0 ) {
 330                         ldap_free_connection( ld, lc, 1, 0 );
 331                         lc = NULL;
 332                 }
 333         }
 334                 if( lc != NULL)
 335                         lc->lconn_rebind_inprogress = 0;
 336         }
 337
 338         return( lc );
 339 }
 340
 341
 342 static LDAPConn *
 343 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 344 /*
 345  * return an existing connection (if any) to the server srv
 346  * if "any" is non-zero, check for any server in the "srv" chain
 347  */
 348 {
 349         LDAPConn        *lc;
 350         LDAPURLDesc     *ls;
 351
 352         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 353                 for ( ls = srv; ls != NULL; ls = ls->lud_next ) {
 354                         if ( lc->lconn_server->lud_host != NULL &&
 355                                 *lc->lconn_server->lud_host != '\0' &&
 356                             ls->lud_host != NULL && *ls->lud_host != '\0' &&
 357                                 strcasecmp( ls->lud_host, lc->lconn_server->lud_host ) == 0
 358                             && ls->lud_port == lc->lconn_server->lud_port ) {
 359                                 return lc;
 360                         }
 361                         if ( !any ) {
 362                                 break;
 363                         }
 364                 }
 365         }
 366
 367         return NULL;
 368 }
 369
 370
 371
 372 static void
 373 use_connection( LDAP *ld, LDAPConn *lc )
 374 {
 375         ++lc->lconn_refcnt;
 376         lc->lconn_lastused = time( NULL );
 377 }
 378
 379
 380 void
 381 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 382 {
 383         LDAPConn        *tmplc, *prevlc;
 384
 385         Debug( LDAP_DEBUG_TRACE, "ldap_free_connection\n", 0, 0, 0 );
 386
 387         if ( force || --lc->lconn_refcnt <= 0 ) {
 388                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 389                         ldap_mark_select_clear( ld, lc->lconn_sb );
 390                         if ( unbind ) {
 391                                 ldap_send_unbind( ld, lc->lconn_sb, NULL, NULL );
 392                         }
 393                 }
 394
 395                 if( lc->lconn_ber != NULL ) {
 396                         ber_free( lc->lconn_ber, 1 );
 397                 }
 398
 399                 ldap_int_sasl_close( ld, lc );
 400
 401                 prevlc = NULL;
 402                 for ( tmplc = ld->ld_conns; tmplc != NULL;
 403                     tmplc = tmplc->lconn_next ) {
 404                         if ( tmplc == lc ) {
 405                                 if ( prevlc == NULL ) {
 406                                     ld->ld_conns = tmplc->lconn_next;
 407                                 } else {
 408                                     prevlc->lconn_next = tmplc->lconn_next;
 409                                 }
 410                                 break;
 411                         }
 412                         prevlc = tmplc;
 413                 }
 414                 ldap_free_urllist( lc->lconn_server );
 415 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 416                 if ( lc->lconn_krbinstance != NULL ) {
 417                         LDAP_FREE( lc->lconn_krbinstance );
 418                 }
 419 #endif
 420                 if ( lc->lconn_sb != ld->ld_sb ) {
 421                         ber_sockbuf_free( lc->lconn_sb );
 422                 }
 423                 if( lc->lconn_rebind_queue != NULL) {
 424                         int i;
 425                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++) {
 426                                 LDAP_VFREE(lc->lconn_rebind_queue[i]);
 427                         }
 428                         LDAP_FREE( lc->lconn_rebind_queue);
 429                 }
 430                 LDAP_FREE( lc );
 431                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: actually freed\n",
 432                     0, 0, 0 );
 433         } else {
 434                 lc->lconn_lastused = time( NULL );
 435                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 436                     lc->lconn_refcnt, 0, 0 );
 437         }
 438 }
 439
 440
 441 #ifdef LDAP_DEBUG
 442 void
 443 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 444 {
 445         LDAPConn        *lc;
 446         char            timebuf[32];
 447
 448         fprintf( stderr, "** Connection%s:\n", all ? "s" : "" );
 449         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 450                 if ( lc->lconn_server != NULL ) {
 451                         fprintf( stderr, "* host: %s  port: %d%s\n",
 452                             ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 453                             : lc->lconn_server->lud_host,
 454                             lc->lconn_server->lud_port, ( lc->lconn_sb ==
 455                             ld->ld_sb ) ? "  (default)" : "" );
 456                 }
 457                 fprintf( stderr, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 458                     ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET ) ?
 459                     "NeedSocket" : ( lc->lconn_status ==
 460                     LDAP_CONNST_CONNECTING ) ? "Connecting" : "Connected" );
 461                 fprintf( stderr, "  last used: %s",
 462                     ldap_pvt_ctime( &lc->lconn_lastused, timebuf ));
 463                 if( lc->lconn_rebind_inprogress ) {
 464                         fprintf( stderr, "  rebind in progress\n");
 465                         if( lc->lconn_rebind_queue != NULL) {
 466                                 int i = 0;
 467                                 for( ;lc->lconn_rebind_queue[i] != NULL; i++) {
 468                                         int j = 0;
 469                                         for( ;lc->lconn_rebind_queue[i][j] != 0; j++) {
 470                                                 fprintf( stderr, "    queue %d entry %d - %s\n",
 471                                                         i, j, lc->lconn_rebind_queue[i][j]);
 472                                         }
 473                                 }
 474                         } else {
 475                                 fprintf( stderr, "    queue is empty\n");
 476                         }
 477                 }
 478                 fprintf(stderr, "\n");
 479                 if ( !all ) {
 480                         break;
 481                 }
 482         }
 483 }
 484
 485
 486 void
 487 ldap_dump_requests_and_responses( LDAP *ld )
 488 {
 489         LDAPRequest     *lr;
 490         LDAPMessage     *lm, *l;
 491
 492         fprintf( stderr, "** Outstanding Requests:\n" );
 493         if (( lr = ld->ld_requests ) == NULL ) {
 494                 fprintf( stderr, "   Empty\n" );
 495         }
 496         for ( ; lr != NULL; lr = lr->lr_next ) {
 497             fprintf( stderr, " * msgid %d,  origid %d, status %s\n",
 498                 lr->lr_msgid, lr->lr_origid,
 499                 ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 500                 ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 501                 ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 502                 ( lr->lr_status == LDAP_REQST_WRITING) ? "Writing" :
 503                 ( lr->lr_status == LDAP_REQST_COMPLETED ? "Request Completed" : "Invalid Status"));
 504             fprintf( stderr, "   outstanding referrals %d, parent count %d\n",
 505                     lr->lr_outrefcnt, lr->lr_parentcnt );
 506         }
 507
 508         fprintf( stderr, "** Response Queue:\n" );
 509         if (( lm = ld->ld_responses ) == NULL ) {
 510                 fprintf( stderr, "   Empty\n" );
 511         }
 512         for ( ; lm != NULL; lm = lm->lm_next ) {
 513                 fprintf( stderr, " * msgid %d,  type %lu\n",
 514                     lm->lm_msgid, (unsigned long) lm->lm_msgtype );
 515                 if (( l = lm->lm_chain ) != NULL ) {
 516                         fprintf( stderr, "   chained responses:\n" );
 517                         for ( ; l != NULL; l = l->lm_chain ) {
 518                                 fprintf( stderr,
 519                                     "  * msgid %d,  type %lu\n",
 520                                     l->lm_msgid,
 521                                     (unsigned long) l->lm_msgtype );
 522                         }
 523                 }
 524         }
 525 }
 526 #endif /* LDAP_DEBUG */
 527
 528
 529 void
 530 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 531 {
 532         LDAPRequest     *tmplr, *nextlr;
 533
 534         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 535                 lr->lr_origid, lr->lr_msgid, 0 );
 536
 537         if ( lr->lr_parent != NULL ) {
 538                 --lr->lr_parent->lr_outrefcnt;
 539         } else {
 540                 /* free all referrals (child requests) */
 541                 for ( tmplr = lr->lr_refnext; tmplr != NULL; tmplr = nextlr ) {
 542                         nextlr = tmplr->lr_refnext;
 543                         ldap_free_request( ld, tmplr );
 544                 }
 545         }
 546
 547         if ( lr->lr_prev == NULL ) {
 548                 ld->ld_requests = lr->lr_next;
 549         } else {
 550                 lr->lr_prev->lr_next = lr->lr_next;
 551         }
 552
 553         if ( lr->lr_next != NULL ) {
 554                 lr->lr_next->lr_prev = lr->lr_prev;
 555         }
 556
 557         if ( lr->lr_ber != NULL ) {
 558                 ber_free( lr->lr_ber, 1 );
 559         }
 560
 561         if ( lr->lr_res_error != NULL ) {
 562                 LDAP_FREE( lr->lr_res_error );
 563         }
 564
 565         if ( lr->lr_res_matched != NULL ) {
 566                 LDAP_FREE( lr->lr_res_matched );
 567         }
 568
 569         LDAP_FREE( lr );
 570 }
 571
 572 /*
 573  * Chase v3 referrals
 574  *
 575  * Parameters:
 576  *  (IN) ld = LDAP connection handle
 577  *  (IN) lr = LDAP Request structure
 578  *  (IN) refs = array of pointers to referral strings that we will chase
 579  *              The array will be free'd by this function when no longer needed
 580  *  (IN) sref != 0 if following search reference
 581  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
 582  *  (OUT) hadrefp = 1 if sucessfully followed referral
 583  *
 584  * Return value - number of referrals followed
 585  */
 586 int
 587 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
 588 {
 589         char            *unfollowed;
 590         int                      unfollowedcnt = 0;
 591         LDAPRequest     *origreq;
 592         LDAPURLDesc     *srv = NULL;
 593         BerElement      *ber;
 594         char            **refarray = NULL;
 595         LDAPConn        *lc;
 596         int                      rc, count, i, j;
 597         LDAPreqinfo  rinfo;
 598
 599         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 600         *hadrefp = 0;
 601
 602         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
 603
 604         unfollowed = NULL;
 605         rc = count = 0;
 606
 607         /* If no referrals in array, return */
 608         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
 609                 rc = 0;
 610                 goto done;
 611         }
 612
 613         /* Check for hop limit exceeded */
 614         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 615                 Debug( LDAP_DEBUG_ANY,
 616                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
 617                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
 618             rc = -1;
 619                 goto done;
 620         }
 621
 622         /* find original request */
 623         for ( origreq = lr;
 624                 origreq->lr_parent != NULL;
 625                 origreq = origreq->lr_parent )
 626         {
 627                 /* empty */ ;
 628         }
 629
 630         refarray = refs;
 631         refs = NULL;
 632         /* parse out & follow referrals */
 633         for( i=0; refarray[i] != NULL; i++) {
 634                 /* Parse the referral URL */
 635                 if (( rc = ldap_url_parse_ext( refarray[i], &srv)) != LDAP_SUCCESS) {
 636                         ld->ld_errno = rc;
 637                         rc = -1;
 638                         goto done;
 639                 }
 640
 641                 if( srv->lud_crit_exts ) {
 642                         /* we do not support any extensions */
 643                         ld->ld_errno = LDAP_NOT_SUPPORTED;
 644                         rc = -1;
 645                         goto done;
 646                 }
 647
 648                 /* treat ldap://hostpart and ldap://hostpart/ the same */
 649                 if ( srv->lud_dn && srv->lud_dn[0] == '\0' ) {
 650                         LDAP_FREE( srv->lud_dn );
 651                         srv->lud_dn = NULL;
 652                 }
 653
 654                 /* check connection for re-bind in progress */
 655                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
 656                         if( lc->lconn_rebind_inprogress) {
 657                                 /* We are already chasing a referral or search reference and a
 658                                  * bind on that connection is in progress.  We must queue
 659                                  * referrals on that connection, so we don't get a request
 660                                  * going out before the bind operation completes. This happens
 661                                  * if two search references come in one behind the other
 662                                  * for the same server with different contexts.
 663                                  */
 664                                 Debug( LDAP_DEBUG_TRACE,
 665                                         "ldap_chase_v3referrals: queue referral \"%s\"\n",
 666                                         refarray[i], 0, 0);
 667                                 if( lc->lconn_rebind_queue == NULL ) {
 668                                         /* Create a referral list */
 669                                         lc->lconn_rebind_queue =
 670                                                 (char ***) LDAP_MALLOC( sizeof(void *) * 2);
 671
 672                                         if( lc->lconn_rebind_queue == NULL) {
 673                                                 ld->ld_errno = LDAP_NO_MEMORY;
 674                                                 rc = -1;
 675                                                 goto done;
 676                                         }
 677
 678                                         lc->lconn_rebind_queue[0] = refarray;
 679                                         lc->lconn_rebind_queue[1] = NULL;
 680                                         refarray = NULL;
 681
 682                                 } else {
 683                                         /* Count how many referral arrays we already have */
 684                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 685                                                 /* empty */;
 686                                         }
 687
 688                                         /* Add the new referral to the list */
 689                                         lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
 690                                                 lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
 691
 692                                         if( lc->lconn_rebind_queue == NULL ) {
 693                                                 ld->ld_errno = LDAP_NO_MEMORY;
 694                                                 rc = -1;
 695                                                 goto done;
 696                                         }
 697                                         lc->lconn_rebind_queue[j] = refarray;
 698                                         lc->lconn_rebind_queue[j+1] = NULL;
 699                                         refarray = NULL;
 700                                 }
 701
 702                                 /* We have queued the referral/reference, now just return */
 703                                 rc = 0;
 704                                 *hadrefp = 1;
 705                                 count = 1; /* Pretend we already followed referral */
 706                                 goto done;
 707                         }
 708                 }
 709                 /* Re-encode the request with the new starting point of the search.
 710                  * Note: In the future we also need to replace the filter if one
 711                  * was provided with the search reference
 712                  */
 713
 714                 /* For references we don't want old dn if new dn empty */
 715                 if ( sref && srv->lud_dn == NULL ) {
 716                         srv->lud_dn = LDAP_STRDUP( "" );
 717                 }
 718
 719                 ber = re_encode_request( ld, origreq->lr_ber, ++ld->ld_msgid,
 720                         sref, srv, &rinfo.ri_request );
 721
 722                 if( ber == NULL ) {
 723                         ld->ld_errno = LDAP_ENCODING_ERROR;
 724                         rc = -1;
 725                         goto done;
 726                 }
 727
 728                 Debug( LDAP_DEBUG_TRACE,
 729                         "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
 730                         lr->lr_msgid, refarray[i], 0);
 731
 732                 /* Send the new request to the server - may require a bind */
 733                 rinfo.ri_msgid = origreq->lr_origid;
 734                 rinfo.ri_url = refarray[i];
 735                 if ( (rc = ldap_send_server_request( ld, ber, ld->ld_msgid,
 736                         origreq, srv, NULL, &rinfo )) < 0 ) {
 737                         /* Failure, try next referral in the list */
 738                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%s)\n",
 739                                 refarray[i], ldap_err2string( ld->ld_errno ), 0);
 740                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i]);
 741                         ldap_free_urllist(srv);
 742                         srv = NULL;
 743                 } else {
 744                         /* Success, no need to try this referral list further */
 745                         rc = 0;
 746                         ++count;
 747                         *hadrefp = 1;
 748
 749                         /* check if there is a queue of referrals that came in during bind */
 750                         if( lc == NULL) {
 751                                 if (( lc = find_connection( ld, srv, 1 )) == NULL ) {
 752                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
 753                                         rc = -1;
 754                                         goto done;
 755                                 }
 756                         }
 757
 758                         if( lc->lconn_rebind_queue != NULL) {
 759                                 /* Release resources of previous list */
 760                                 LDAP_VFREE(refarray);
 761                                 refarray = NULL;
 762                                 ldap_free_urllist(srv);
 763                                 srv = NULL;
 764
 765                                 /* Pull entries off end of queue so list always null terminated */
 766                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 767                                         ;
 768                                 }
 769                                 refarray = lc->lconn_rebind_queue[j-1];
 770                                 lc->lconn_rebind_queue[j-1] = NULL;
 771                                 /* we pulled off last entry from queue, free queue */
 772                                 if ( j == 1 ) {
 773                                         LDAP_FREE( lc->lconn_rebind_queue);
 774                                         lc->lconn_rebind_queue = NULL;
 775                                 }
 776                                 /* restart the loop the with new referral list */
 777                                 i = -1;
 778                                 continue;
 779                         }
 780                         break; /* referral followed, break out of for loop */
 781                 }
 782         } /* end for loop */
 783 done:
 784         LDAP_VFREE(refarray);
 785         ldap_free_urllist(srv);
 786         LDAP_FREE( *errstrp );
 787
 788         if( rc == 0) {
 789                 *errstrp = NULL;
 790                 LDAP_FREE( unfollowed );
 791                 return count;
 792         } else {
 793                 ld->ld_errno = LDAP_REFERRAL;
 794                 *errstrp = unfollowed;
 795                 return rc;
 796         }
 797 }
 798
 799 /*
 800  * XXX merging of errors in this routine needs to be improved
 801  */
 802 int
 803 ldap_chase_referrals( LDAP *ld,
 804         LDAPRequest *lr,
 805         char **errstrp,
 806         int sref,
 807         int *hadrefp )
 808 {
 809         int             rc, count, len;
 810         char            *p, *ref, *unfollowed;
 811         LDAPRequest     *origreq;
 812         LDAPURLDesc     *srv;
 813         BerElement      *ber;
 814         LDAPreqinfo  rinfo;
 815
 816         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
 817
 818         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 819         *hadrefp = 0;
 820
 821         if ( *errstrp == NULL ) {
 822                 return( 0 );
 823         }
 824
 825         len = strlen( *errstrp );
 826         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
 827                 if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
 828                         *p = '\0';
 829                         p += LDAP_REF_STR_LEN;
 830                         break;
 831                 }
 832         }
 833
 834         if ( len < LDAP_REF_STR_LEN ) {
 835                 return( 0 );
 836         }
 837
 838         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 839                 Debug( LDAP_DEBUG_ANY,
 840                     "more than %d referral hops (dropping)\n",
 841                     ld->ld_refhoplimit, 0, 0 );
 842                     /* XXX report as error in ld->ld_errno? */
 843                     return( 0 );
 844         }
 845
 846         /* find original request */
 847         for ( origreq = lr; origreq->lr_parent != NULL;
 848              origreq = origreq->lr_parent ) {
 849                 /* empty */;
 850         }
 851
 852         unfollowed = NULL;
 853         rc = count = 0;
 854
 855         /* parse out & follow referrals */
 856         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
 857                 if (( p = strchr( ref, '\n' )) != NULL ) {
 858                         *p++ = '\0';
 859                 } else {
 860                         p = NULL;
 861                 }
 862
 863                 rc = ldap_url_parse_ext( ref, &srv );
 864
 865                 if ( rc != LDAP_URL_SUCCESS ) {
 866                         Debug( LDAP_DEBUG_TRACE,
 867                             "ignoring unknown referral <%s>\n", ref, 0, 0 );
 868                         rc = ldap_append_referral( ld, &unfollowed, ref );
 869                         *hadrefp = 1;
 870                         continue;
 871                 }
 872
 873                 if( srv->lud_dn != NULL && srv->lud_dn == '\0' ) {
 874                         LDAP_FREE( srv->lud_dn );
 875                         srv->lud_dn = NULL;
 876                 }
 877
 878                 Debug( LDAP_DEBUG_TRACE,
 879                     "chasing LDAP referral: <%s>\n", ref, 0, 0 );
 880
 881                 *hadrefp = 1;
 882
 883                 ber = re_encode_request( ld, origreq->lr_ber,
 884                     ++ld->ld_msgid, sref, srv, &rinfo.ri_request );
 885
 886                 if( ber == NULL ) {
 887                         return -1 ;
 888                 }
 889
 890                 /* copy the complete referral for rebind process */
 891                 rinfo.ri_url = LDAP_STRDUP( ref );
 892
 893                 rinfo.ri_msgid = origreq->lr_origid;
 894
 895                 rc = ldap_send_server_request( ld, ber, ld->ld_msgid,
 896                     lr, srv, NULL, &rinfo );
 897
 898                 LDAP_FREE( rinfo.ri_url );
 899
 900                 if( rc >= 0 ) {
 901                         ++count;
 902                 } else {
 903                         Debug( LDAP_DEBUG_ANY,
 904                             "Unable to chase referral (%s)\n",
 905                             ldap_err2string( ld->ld_errno ), 0, 0 );
 906                         rc = ldap_append_referral( ld, &unfollowed, ref );
 907                 }
 908
 909                 ldap_free_urllist(srv);
 910         }
 911
 912         LDAP_FREE( *errstrp );
 913         *errstrp = unfollowed;
 914
 915         return(( rc == 0 ) ? count : rc );
 916 }
 917
 918
 919 int
 920 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
 921 {
 922         int     first;
 923
 924         if ( *referralsp == NULL ) {
 925                 first = 1;
 926                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
 927                     + 1 );
 928         } else {
 929                 first = 0;
 930                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
 931                     strlen( *referralsp ) + strlen( s ) + 2 );
 932         }
 933
 934         if ( *referralsp == NULL ) {
 935                 ld->ld_errno = LDAP_NO_MEMORY;
 936                 return( -1 );
 937         }
 938
 939         if ( first ) {
 940                 strcpy( *referralsp, LDAP_REF_STR );
 941         } else {
 942                 strcat( *referralsp, "\n" );
 943         }
 944         strcat( *referralsp, s );
 945
 946         return( 0 );
 947 }
 948
 949
 950
 951 static BerElement *
 952 re_encode_request( LDAP *ld,
 953         BerElement *origber,
 954         ber_int_t msgid,
 955         int sref,
 956         LDAPURLDesc *srv,
 957         int *type )
 958 {
 959         /*
 960          * XXX this routine knows way too much about how the lber library works!
 961          */
 962         ber_int_t       along;
 963         ber_tag_t       tag;
 964         ber_int_t       ver;
 965         ber_int_t       scope;
 966         int             rc;
 967         BerElement      tmpber, *ber;
 968         char            *orig_dn;
 969         char            *dn;
 970
 971         Debug( LDAP_DEBUG_TRACE,
 972             "re_encode_request: new msgid %ld, new dn <%s>\n",
 973             (long) msgid,
 974                 ( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
 975
 976         tmpber = *origber;
 977
 978         /*
 979          * all LDAP requests are sequences that start with a message id.
 980          * For all except delete, this is followed by a sequence that is
 981          * tagged with the operation code.  For delete, the provided DN
 982          * is not wrapped by a sequence.
 983          */
 984         rc = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
 985
 986         if ( rc == LBER_ERROR ) {
 987                 ld->ld_errno = LDAP_DECODING_ERROR;
 988                 return( NULL );
 989         }
 990
 991         assert( tag != 0);
 992         if ( tag == LDAP_REQ_BIND ) {
 993                 /* bind requests have a version number before the DN & other stuff */
 994                 rc = ber_scanf( &tmpber, "{ia" /*}*/, &ver, &orig_dn );
 995
 996         } else if ( tag == LDAP_REQ_DELETE ) {
 997                 /* delete requests don't have a DN wrapping sequence */
 998                 rc = ber_scanf( &tmpber, "a", &orig_dn );
 999
1000         } else if ( tag == LDAP_REQ_SEARCH ) {
1001                 /* search requests need to be re-scope-ed */
1002                 rc = ber_scanf( &tmpber, "{ae" /*"}"*/, &orig_dn, &scope );
1003
1004                 if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
1005                         /* use the scope provided in reference */
1006                         scope = srv->lud_scope;
1007
1008                 } else if ( sref && scope != LDAP_SCOPE_SUBTREE ) {
1009                         /* use scope implied by previous operation */
1010                         /*   base -> base */
1011                         /*   one -> base */
1012                         /*   subtree -> subtree */
1013                         scope = LDAP_SCOPE_BASE;
1014                 }
1015
1016         } else {
1017                 rc = ber_scanf( &tmpber, "{a" /*}*/, &orig_dn );
1018         }
1019
1020         if( rc == LBER_ERROR ) {
1021                 ld->ld_errno = LDAP_DECODING_ERROR;
1022                 return NULL;
1023         }
1024
1025         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1026                 return NULL;
1027         }
1028
1029         if ( srv->lud_dn == NULL ) {
1030                 dn = orig_dn;
1031         } else {
1032                 dn = srv->lud_dn;
1033         }
1034
1035         if ( tag == LDAP_REQ_BIND ) {
1036                 rc = ber_printf( ber, "{it{is" /*}}*/, msgid, tag, ver, dn );
1037         } else if ( tag == LDAP_REQ_DELETE ) {
1038                 rc = ber_printf( ber, "{itsN}", msgid, tag, dn );
1039         } else if ( tag == LDAP_REQ_SEARCH ) {
1040                 rc = ber_printf( ber, "{it{se" /*}}*/, msgid, tag, dn, scope );
1041         } else {
1042                 rc = ber_printf( ber, "{it{s" /*}}*/, msgid, tag, dn );
1043         }
1044
1045         LDAP_FREE( orig_dn );
1046
1047         if ( rc == -1 ) {
1048                 ld->ld_errno = LDAP_ENCODING_ERROR;
1049                 ber_free( ber, 1 );
1050                 return NULL;
1051         }
1052
1053         if ( tag != LDAP_REQ_DELETE && (
1054                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1055                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1056             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1057         {
1058                 ld->ld_errno = LDAP_ENCODING_ERROR;
1059                 ber_free( ber, 1 );
1060                 return NULL;
1061         }
1062
1063 #ifdef LDAP_DEBUG
1064         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1065                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1066                     0, 0, 0 );
1067                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1068         }
1069 #endif /* LDAP_DEBUG */
1070
1071         *type = tag;    /* return request type */
1072         return ber;
1073 }
1074
1075
1076 LDAPRequest *
1077 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1078 {
1079         LDAPRequest     *lr;
1080
1081         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1082                 if( lr->lr_status == LDAP_REQST_COMPLETED ) {
1083                         continue;       /* Skip completed requests */
1084                 }
1085                 if ( msgid == lr->lr_msgid ) {
1086                         break;
1087                 }
1088         }
1089
1090         return( lr );
1091 }
1092
1093