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

   1 /*
   2  *  Copyright (c) 1995 Regents of the University of Michigan.
   3  *  All rights reserved.
   4  *
   5  *  request.c - sending of ldap requests; handling of referrals
   6  */
   7
   8 #include "portable.h"
   9
  10 #ifndef lint
  11 static char copyright[] = "@(#) Copyright (c) 1995 Regents of the University of Michigan.\nAll rights reserved.\n";
  12 #endif
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16
  17 #include <ac/errno.h>
  18 #include <ac/socket.h>
  19 #include <ac/string.h>
  20 #include <ac/time.h>
  21 #include <ac/unistd.h>
  22
  23 #include "ldap-int.h"
  24
  25 #if defined( LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS ) || defined( LDAP_API_FEATURE_X_OPENLDAP_V2_DNS )
  26 static LDAPConn *find_connection LDAP_P(( LDAP *ld, LDAPServer *srv, int any ));
  27 static void use_connection LDAP_P(( LDAP *ld, LDAPConn *lc ));
  28 static void free_servers LDAP_P(( LDAPServer *srvlist ));
  29 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS || LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
  30
  31
  32 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
  33 static LDAPServer *dn2servers LDAP_P(( LDAP *ld, char *dn ));
  34 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
  35
  36 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS
  37 static BerElement *re_encode_request LDAP_P(( LDAP *ld, BerElement *origber,
  38     int msgid, char **dnp ));
  39 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS */
  40
  41
  42 BerElement *
  43 ldap_alloc_ber_with_options( LDAP *ld )
  44 {
  45         BerElement      *ber;
  46
  47         if (( ber = ber_alloc_t( ld->ld_lberoptions )) == NULLBER ) {
  48                 ld->ld_errno = LDAP_NO_MEMORY;
  49 #ifdef STR_TRANSLATION
  50         } else {
  51                 ldap_set_ber_options( ld, ber );
  52 #endif /* STR_TRANSLATION */
  53         }
  54
  55         return( ber );
  56 }
  57
  58
  59 void
  60 ldap_set_ber_options( LDAP *ld, BerElement *ber )
  61 {
  62         ber->ber_options = ld->ld_lberoptions;
  63 #ifdef STR_TRANSLATION
  64         if (( ld->ld_lberoptions & LBER_TRANSLATE_STRINGS ) != 0 ) {
  65                 ber_set_string_translators( ber,
  66                     ld->ld_lber_encode_translate_proc,
  67                     ld->ld_lber_decode_translate_proc );
  68         }
  69 #endif /* STR_TRANSLATION */
  70 }
  71
  72
  73 int
  74 ldap_send_initial_request( LDAP *ld, unsigned long msgtype, char *dn,
  75         BerElement *ber )
  76 {
  77 #if defined( LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS ) || defined( LDAP_API_FEATURE_X_OPENLDAP_V2_DNS )
  78         LDAPServer      *servers;
  79 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS || LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
  80
  81         Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
  82
  83 #if !defined( LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS ) && !defined( LDAP_API_FEATURE_X_OPENLDAP_V2_DNS )
  84         if ( ber_flush( &ld->ld_sb, ber, 1 ) != 0 ) {
  85                 ld->ld_errno = LDAP_SERVER_DOWN;
  86                 return( -1 );
  87         }
  88
  89         ld->ld_errno = LDAP_SUCCESS;
  90         return( ld->ld_msgid );
  91 #else /* !LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS && !LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
  92
  93 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
  94         if (( LDAP_BOOL_GET(&ld->ld_options, LDAP_BOOL_DNS ) == LDAP_OPT_ON )
  95                 && ldap_is_dns_dn( dn ) )
  96         {
  97                 if (( servers = dn2servers( ld, dn )) == NULL ) {
  98                         ber_free( ber, 1 );
  99                         return( -1 );
 100                 }
 101
 102 #ifdef LDAP_DEBUG
 103                 if ( ldap_debug & LDAP_DEBUG_TRACE ) {
 104                         LDAPServer      *srv;
 105
 106                         for ( srv = servers; srv != NULL;
 107                             srv = srv->lsrv_next ) {
 108                                 fprintf( stderr,
 109                                     "LDAP server %s:  dn %s, port %d\n",
 110                                     srv->lsrv_host, ( srv->lsrv_dn == NULL ) ?
 111                                     "(default)" : srv->lsrv_dn,
 112                                     srv->lsrv_port );
 113                         }
 114                 }
 115 #endif /* LDAP_DEBUG */
 116         } else {
 117 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 118                 /*
 119                  * use of DNS is turned off or this is an X.500 DN...
 120                  * use our default connection
 121                  */
 122                 servers = NULL;
 123 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 124         }
 125 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 126
 127         return( ldap_send_server_request( ld, ber, ld->ld_msgid, NULL, servers,
 128             NULL, 0 ));
 129 #endif /* !LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS && !LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 130 }
 131
 132
 133
 134 #if defined( LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS ) || defined( LDAP_API_FEATURE_X_OPENLDAP_V2_DNS )
 135 int
 136 ldap_send_server_request( LDAP *ld, BerElement *ber, int msgid, LDAPRequest
 137         *parentreq, LDAPServer *srvlist, LDAPConn *lc, int bind )
 138 {
 139         LDAPRequest     *lr;
 140         int incparent;
 141
 142         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 143
 144         incparent = 0;
 145         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 146
 147         if ( lc == NULL ) {
 148                 if ( srvlist == NULL ) {
 149                         lc = ld->ld_defconn;
 150                 } else {
 151                         if (( lc = find_connection( ld, srvlist, 1 )) ==
 152                             NULL ) {
 153                                 if ( bind && (parentreq != NULL) ) {
 154                                         /* Remember the bind in the parent */
 155                                         incparent = 1;
 156                                         ++parentreq->lr_outrefcnt;
 157                                 }
 158                                 lc = ldap_new_connection( ld, &srvlist, 0, 1, bind );
 159                         }
 160                         free_servers( srvlist );
 161                 }
 162         }
 163
 164         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 165                 ber_free( ber, 1 );
 166                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 167                         ld->ld_errno = LDAP_SERVER_DOWN;
 168                 }
 169                 if ( incparent ) {
 170                         /* Forget about the bind */
 171                         --parentreq->lr_outrefcnt;
 172                 }
 173                 return( -1 );
 174         }
 175
 176         use_connection( ld, lc );
 177         if (( lr = (LDAPRequest *)calloc( 1, sizeof( LDAPRequest ))) ==
 178             NULL ) {
 179                 ld->ld_errno = LDAP_NO_MEMORY;
 180                 ldap_free_connection( ld, lc, 0, 0 );
 181                 ber_free( ber, 1 );
 182                 if ( incparent ) {
 183                         /* Forget about the bind */
 184                         --parentreq->lr_outrefcnt;
 185                 }
 186                 return( -1 );
 187         }
 188         lr->lr_msgid = msgid;
 189         lr->lr_status = LDAP_REQST_INPROGRESS;
 190         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 191         lr->lr_ber = ber;
 192         lr->lr_conn = lc;
 193         if ( parentreq != NULL ) {      /* sub-request */
 194                 if ( !incparent ) {
 195                         /* Increment if we didn't do it before the bind */
 196                         ++parentreq->lr_outrefcnt;
 197                 }
 198                 lr->lr_origid = parentreq->lr_origid;
 199                 lr->lr_parentcnt = parentreq->lr_parentcnt + 1;
 200                 lr->lr_parent = parentreq;
 201                 lr->lr_refnext = parentreq->lr_refnext;
 202                 parentreq->lr_refnext = lr;
 203         } else {                        /* original request */
 204                 lr->lr_origid = lr->lr_msgid;
 205         }
 206
 207         if (( lr->lr_next = ld->ld_requests ) != NULL ) {
 208                 lr->lr_next->lr_prev = lr;
 209         }
 210         ld->ld_requests = lr;
 211         lr->lr_prev = NULL;
 212
 213         if ( ber_flush( lc->lconn_sb, ber, 0 ) != 0 ) {
 214 #ifdef notyet
 215                 if ( errno == EWOULDBLOCK ) {
 216                         /* need to continue write later */
 217                         lr->lr_status = LDAP_REQST_WRITING;
 218                         ldap_mark_select_write( ld, lc->lconn_sb );
 219                 } else {
 220 #else /* notyet */
 221                         ld->ld_errno = LDAP_SERVER_DOWN;
 222                         ldap_free_request( ld, lr );
 223                         ldap_free_connection( ld, lc, 0, 0 );
 224                         return( -1 );
 225 #endif /* notyet */
 226 #ifdef notyet
 227                 }
 228 #endif /* notyet */
 229         } else {
 230                 if ( parentreq == NULL ) {
 231                         ber->ber_end = ber->ber_ptr;
 232                         ber->ber_ptr = ber->ber_buf;
 233                 }
 234
 235                 /* sent -- waiting for a response */
 236                 ldap_mark_select_read( ld, lc->lconn_sb );
 237         }
 238
 239         ld->ld_errno = LDAP_SUCCESS;
 240         return( msgid );
 241 }
 242
 243
 244 LDAPConn *
 245 ldap_new_connection( LDAP *ld, LDAPServer **srvlistp, int use_ldsb,
 246         int connect, int bind )
 247 {
 248         LDAPConn        *lc;
 249         LDAPServer      *prevsrv, *srv;
 250         Sockbuf         *sb;
 251
 252         /*
 253          * make a new LDAP server connection
 254          * XXX open connection synchronously for now
 255          */
 256         if (( lc = (LDAPConn *)calloc( 1, sizeof( LDAPConn ))) == NULL ||
 257             ( !use_ldsb && ( sb = (Sockbuf *)calloc( 1, sizeof( Sockbuf )))
 258             == NULL )) {
 259                 if ( lc != NULL ) {
 260                         free( (char *)lc );
 261                 }
 262                 ld->ld_errno = LDAP_NO_MEMORY;
 263                 return( NULL );
 264         }
 265
 266         lc->lconn_sb = ( use_ldsb ) ? &ld->ld_sb : sb;
 267
 268         if ( connect ) {
 269                 prevsrv = NULL;
 270
 271                 for ( srv = *srvlistp; srv != NULL; srv = srv->lsrv_next ) {
 272                         if ( open_ldap_connection( ld, lc->lconn_sb,
 273                             srv->lsrv_host, srv->lsrv_port,
 274                             &lc->lconn_krbinstance, 0 ) != -1 ) {
 275                                 break;
 276                         }
 277                         prevsrv = srv;
 278                 }
 279
 280                 if ( srv == NULL ) {
 281                     if ( !use_ldsb ) {
 282                         free( (char *)lc->lconn_sb );
 283                     }
 284                     free( (char *)lc );
 285                     ld->ld_errno = LDAP_SERVER_DOWN;
 286                     return( NULL );
 287                 }
 288
 289                 if ( prevsrv == NULL ) {
 290                     *srvlistp = srv->lsrv_next;
 291                 } else {
 292                     prevsrv->lsrv_next = srv->lsrv_next;
 293                 }
 294                 lc->lconn_server = srv;
 295         }
 296
 297         lc->lconn_status = LDAP_CONNST_CONNECTED;
 298         lc->lconn_next = ld->ld_conns;
 299         ld->ld_conns = lc;
 300
 301         /*
 302          * XXX for now, we always do a synchronous bind.  This will have
 303          * to change in the long run...
 304          */
 305         if ( bind ) {
 306                 int             err, freepasswd, authmethod;
 307                 char            *binddn, *passwd;
 308                 LDAPConn        *savedefconn;
 309
 310                 freepasswd = err = 0;
 311
 312                 if ( ld->ld_rebindproc == NULL ) {
 313                         binddn = passwd = "";
 314                         authmethod = LDAP_AUTH_SIMPLE;
 315                 } else {
 316                         if (( err = (*ld->ld_rebindproc)( ld, &binddn, &passwd,
 317                             &authmethod, 0 )) == LDAP_SUCCESS ) {
 318                                 freepasswd = 1;
 319                         } else {
 320                                 ld->ld_errno = err;
 321                                 err = -1;
 322                         }
 323                 }
 324
 325
 326                 if ( err == 0 ) {
 327                         savedefconn = ld->ld_defconn;
 328                         ld->ld_defconn = lc;
 329                         ++lc->lconn_refcnt;     /* avoid premature free */
 330
 331                         if ( ldap_bind_s( ld, binddn, passwd, authmethod ) !=
 332                             LDAP_SUCCESS ) {
 333                                 err = -1;
 334                         }
 335                         --lc->lconn_refcnt;
 336                         ld->ld_defconn = savedefconn;
 337                 }
 338
 339                 if ( freepasswd ) {
 340                         (*ld->ld_rebindproc)( ld, &binddn, &passwd,
 341                                 &authmethod, 1 );
 342                 }
 343
 344                 if ( err != 0 ) {
 345                         ldap_free_connection( ld, lc, 1, 0 );
 346                         lc = NULL;
 347                 }
 348         }
 349
 350         return( lc );
 351 }
 352
 353
 354 static LDAPConn *
 355 find_connection( LDAP *ld, LDAPServer *srv, int any )
 356 /*
 357  * return an existing connection (if any) to the server srv
 358  * if "any" is non-zero, check for any server in the "srv" chain
 359  */
 360 {
 361         LDAPConn        *lc;
 362         LDAPServer      *ls;
 363
 364         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 365                 for ( ls = srv; ls != NULL; ls = ls->lsrv_next ) {
 366                         if ( lc->lconn_server->lsrv_host != NULL &&
 367                             ls->lsrv_host != NULL && strcasecmp(
 368                             ls->lsrv_host, lc->lconn_server->lsrv_host ) == 0
 369                             && ls->lsrv_port == lc->lconn_server->lsrv_port ) {
 370                                 return( lc );
 371                         }
 372                         if ( !any ) {
 373                                 break;
 374                         }
 375                 }
 376         }
 377
 378         return( NULL );
 379 }
 380
 381
 382
 383 static void
 384 use_connection( LDAP *ld, LDAPConn *lc )
 385 {
 386         ++lc->lconn_refcnt;
 387         lc->lconn_lastused = time( 0 );
 388 }
 389
 390
 391 void
 392 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 393 {
 394         LDAPConn        *tmplc, *prevlc;
 395
 396         Debug( LDAP_DEBUG_TRACE, "ldap_free_connection\n", 0, 0, 0 );
 397
 398         if ( force || --lc->lconn_refcnt <= 0 ) {
 399                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 400                         ldap_mark_select_clear( ld, lc->lconn_sb );
 401                         if ( unbind ) {
 402                                 ldap_send_unbind( ld, lc->lconn_sb );
 403                         }
 404                         ldap_close_connection( lc->lconn_sb );
 405                         if ( lc->lconn_sb->sb_ber.ber_buf != NULL ) {
 406                                 free( lc->lconn_sb->sb_ber.ber_buf );
 407                         }
 408                 }
 409                 prevlc = NULL;
 410                 for ( tmplc = ld->ld_conns; tmplc != NULL;
 411                     tmplc = tmplc->lconn_next ) {
 412                         if ( tmplc == lc ) {
 413                                 if ( prevlc == NULL ) {
 414                                     ld->ld_conns = tmplc->lconn_next;
 415                                 } else {
 416                                     prevlc->lconn_next = tmplc->lconn_next;
 417                                 }
 418                                 break;
 419                         }
 420                         prevlc = tmplc;
 421                 }
 422                 free_servers( lc->lconn_server );
 423                 if ( lc->lconn_krbinstance != NULL ) {
 424                         free( lc->lconn_krbinstance );
 425                 }
 426                 if ( lc->lconn_sb != &ld->ld_sb ) {
 427                         free( (char *)lc->lconn_sb );
 428                 }
 429                 free( lc );
 430                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: actually freed\n",
 431                     0, 0, 0 );
 432         } else {
 433                 lc->lconn_lastused = time( 0 );
 434                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 435                     lc->lconn_refcnt, 0, 0 );
 436         }
 437 }
 438
 439
 440 #ifdef LDAP_DEBUG
 441 void
 442 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 443 {
 444         LDAPConn        *lc;
 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->lsrv_host == NULL ) ? "(null)"
 451                             : lc->lconn_server->lsrv_host,
 452                             lc->lconn_server->lsrv_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\n",
 460                     ctime( &lc->lconn_lastused ));
 461                 if ( !all ) {
 462                         break;
 463                 }
 464         }
 465 }
 466
 467
 468 void
 469 ldap_dump_requests_and_responses( LDAP *ld )
 470 {
 471         LDAPRequest     *lr;
 472         LDAPMessage     *lm, *l;
 473
 474         fprintf( stderr, "** Outstanding Requests:\n" );
 475         if (( lr = ld->ld_requests ) == NULL ) {
 476                 fprintf( stderr, "   Empty\n" );
 477         }
 478         for ( ; lr != NULL; lr = lr->lr_next ) {
 479             fprintf( stderr, " * msgid %d,  origid %d, status %s\n",
 480                 lr->lr_msgid, lr->lr_origid, ( lr->lr_status ==
 481                 LDAP_REQST_INPROGRESS ) ? "InProgress" :
 482                 ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 483                 ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 484                 "Writing" );
 485             fprintf( stderr, "   outstanding referrals %d, parent count %d\n",
 486                     lr->lr_outrefcnt, lr->lr_parentcnt );
 487         }
 488
 489         fprintf( stderr, "** Response Queue:\n" );
 490         if (( lm = ld->ld_responses ) == NULLMSG ) {
 491                 fprintf( stderr, "   Empty\n" );
 492         }
 493         for ( ; lm != NULLMSG; lm = lm->lm_next ) {
 494                 fprintf( stderr, " * msgid %d,  type %d\n",
 495                     lm->lm_msgid, lm->lm_msgtype );
 496                 if (( l = lm->lm_chain ) != NULL ) {
 497                         fprintf( stderr, "   chained responses:\n" );
 498                         for ( ; l != NULLMSG; l = l->lm_chain ) {
 499                                 fprintf( stderr,
 500                                     "  * msgid %d,  type %d\n",
 501                                     l->lm_msgid, l->lm_msgtype );
 502                         }
 503                 }
 504         }
 505 }
 506 #endif /* LDAP_DEBUG */
 507
 508
 509 void
 510 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 511 {
 512         LDAPRequest     *tmplr, *nextlr;
 513
 514         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 515                 lr->lr_origid, lr->lr_msgid, 0 );
 516
 517         if ( lr->lr_parent != NULL ) {
 518                 --lr->lr_parent->lr_outrefcnt;
 519         } else {
 520                 /* free all referrals (child requests) */
 521                 for ( tmplr = lr->lr_refnext; tmplr != NULL; tmplr = nextlr ) {
 522                         nextlr = tmplr->lr_refnext;
 523                         ldap_free_request( ld, tmplr );
 524                 }
 525         }
 526
 527         if ( lr->lr_prev == NULL ) {
 528                 ld->ld_requests = lr->lr_next;
 529         } else {
 530                 lr->lr_prev->lr_next = lr->lr_next;
 531         }
 532
 533         if ( lr->lr_next != NULL ) {
 534                 lr->lr_next->lr_prev = lr->lr_prev;
 535         }
 536
 537         if ( lr->lr_ber != NULL ) {
 538                 ber_free( lr->lr_ber, 1 );
 539         }
 540
 541         if ( lr->lr_res_error != NULL ) {
 542                 free( lr->lr_res_error );
 543         }
 544
 545         if ( lr->lr_res_matched != NULL ) {
 546                 free( lr->lr_res_matched );
 547         }
 548
 549         free( lr );
 550 }
 551
 552
 553 static void
 554 free_servers( LDAPServer *srvlist )
 555 {
 556     LDAPServer  *nextsrv;
 557
 558     while ( srvlist != NULL ) {
 559         nextsrv = srvlist->lsrv_next;
 560         if ( srvlist->lsrv_dn != NULL ) {
 561                 free( srvlist->lsrv_dn );
 562         }
 563         if ( srvlist->lsrv_host != NULL ) {
 564                 free( srvlist->lsrv_host );
 565         }
 566         free( srvlist );
 567         srvlist = nextsrv;
 568     }
 569 }
 570 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS || LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 571
 572
 573 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS
 574 /*
 575  * XXX merging of errors in this routine needs to be improved
 576  */
 577 int
 578 ldap_chase_referrals( LDAP *ld, LDAPRequest *lr, char **errstrp, int *hadrefp )
 579 {
 580         int             rc, count, len, newdn;
 581 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 582         int             ldapref;
 583 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 584         char            *p, *ports, *ref, *tmpref, *refdn, *unfollowed;
 585         LDAPRequest     *origreq;
 586         LDAPServer      *srv;
 587         BerElement      *ber;
 588
 589         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
 590
 591         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 592         *hadrefp = 0;
 593
 594         if ( *errstrp == NULL ) {
 595                 return( 0 );
 596         }
 597
 598         len = strlen( *errstrp );
 599         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
 600                 if (( *p == 'R' || *p == 'r' ) && strncasecmp( p,
 601                     LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
 602                         *p = '\0';
 603                         p += LDAP_REF_STR_LEN;
 604                         break;
 605                 }
 606         }
 607
 608         if ( len < LDAP_REF_STR_LEN ) {
 609                 return( 0 );
 610         }
 611
 612         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 613                 Debug( LDAP_DEBUG_ANY,
 614                     "more than %d referral hops (dropping)\n",
 615                     ld->ld_refhoplimit, 0, 0 );
 616                     /* XXX report as error in ld->ld_errno? */
 617                     return( 0 );
 618         }
 619
 620         /* find original request */
 621         for ( origreq = lr; origreq->lr_parent != NULL;
 622              origreq = origreq->lr_parent ) {
 623                 ;
 624         }
 625
 626         unfollowed = NULL;
 627         rc = count = 0;
 628
 629         /* parse out & follow referrals */
 630         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
 631 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 632                 ldapref = 0;
 633 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 634
 635                 if (( p = strchr( ref, '\n' )) != NULL ) {
 636                         *p++ = '\0';
 637                 } else {
 638                         p = NULL;
 639                 }
 640
 641                 len = strlen( ref );
 642                 if ( len > LDAP_LDAP_REF_STR_LEN && strncasecmp( ref,
 643                     LDAP_LDAP_REF_STR, LDAP_LDAP_REF_STR_LEN ) == 0 ) {
 644                         Debug( LDAP_DEBUG_TRACE,
 645                             "chasing LDAP referral: <%s>\n", ref, 0, 0 );
 646 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 647                         ldapref = 1;
 648 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 649                         tmpref = ref + LDAP_LDAP_REF_STR_LEN;
 650 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 651                 } else if ( len > LDAP_DX_REF_STR_LEN && strncasecmp( ref,
 652                     LDAP_DX_REF_STR, LDAP_DX_REF_STR_LEN ) == 0 ) {
 653                         Debug( LDAP_DEBUG_TRACE,
 654                             "chasing DX referral: <%s>\n", ref, 0, 0 );
 655                         tmpref = ref + LDAP_DX_REF_STR_LEN;
 656 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 657                 } else {
 658                         Debug( LDAP_DEBUG_TRACE,
 659                             "ignoring unknown referral <%s>\n", ref, 0, 0 );
 660                         rc = ldap_append_referral( ld, &unfollowed, ref );
 661                         *hadrefp = 1;
 662                         continue;
 663                 }
 664
 665                 *hadrefp = 1;
 666                 if (( refdn = strchr( tmpref, '/' )) != NULL ) {
 667                         *refdn++ = '\0';
 668                         newdn = 1;
 669                 } else {
 670                         newdn = 0;
 671                 }
 672
 673                 if (( ber = re_encode_request( ld, origreq->lr_ber,
 674                     ++ld->ld_msgid, &refdn )) == NULL ) {
 675                         return( -1 );
 676                 }
 677
 678 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 679                 if ( ldapref ) {
 680 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 681                         if (( srv = (LDAPServer *)calloc( 1,
 682                             sizeof( LDAPServer ))) == NULL ) {
 683                                 ber_free( ber, 1 );
 684                                 ld->ld_errno = LDAP_NO_MEMORY;
 685                                 return( -1 );
 686                         }
 687
 688                         if (( srv->lsrv_host = ldap_strdup( tmpref )) == NULL ) {
 689                                 free( (char *)srv );
 690                                 ber_free( ber, 1 );
 691                                 ld->ld_errno = LDAP_NO_MEMORY;
 692                                 return( -1 );
 693                         }
 694
 695                         if (( ports = strchr( srv->lsrv_host, ':' )) != NULL ) {
 696                                 *ports++ = '\0';
 697                                 srv->lsrv_port = atoi( ports );
 698                         } else {
 699                                 srv->lsrv_port = openldap_ldap_global_options.ldo_defport;
 700                         }
 701 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 702                 } else {
 703                         srv = dn2servers( ld, tmpref );
 704                 }
 705 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 706
 707                 if ( srv != NULL && ldap_send_server_request( ld, ber, ld->ld_msgid,
 708                     lr, srv, NULL, 1 ) >= 0 ) {
 709                         ++count;
 710                 } else {
 711                         Debug( LDAP_DEBUG_ANY,
 712                             "Unable to chase referral (%s)\n",
 713                             ldap_err2string( ld->ld_errno ), 0, 0 );
 714                         rc = ldap_append_referral( ld, &unfollowed, ref );
 715                 }
 716
 717                 if ( !newdn && refdn != NULL ) {
 718                         free( refdn );
 719                 }
 720         }
 721
 722         free( *errstrp );
 723         *errstrp = unfollowed;
 724
 725         return(( rc == 0 ) ? count : rc );
 726 }
 727
 728
 729 int
 730 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
 731 {
 732         int     first;
 733
 734         if ( *referralsp == NULL ) {
 735                 first = 1;
 736                 *referralsp = (char *)malloc( strlen( s ) + LDAP_REF_STR_LEN
 737                     + 1 );
 738         } else {
 739                 first = 0;
 740                 *referralsp = (char *)realloc( *referralsp,
 741                     strlen( *referralsp ) + strlen( s ) + 2 );
 742         }
 743
 744         if ( *referralsp == NULL ) {
 745                 ld->ld_errno = LDAP_NO_MEMORY;
 746                 return( -1 );
 747         }
 748
 749         if ( first ) {
 750                 strcpy( *referralsp, LDAP_REF_STR );
 751         } else {
 752                 strcat( *referralsp, "\n" );
 753         }
 754         strcat( *referralsp, s );
 755
 756         return( 0 );
 757 }
 758
 759
 760
 761 static BerElement *
 762 re_encode_request( LDAP *ld, BerElement *origber, int msgid, char **dnp )
 763 {
 764 /*
 765  * XXX this routine knows way too much about how the lber library works!
 766  */
 767         unsigned long   along, tag;
 768         long            ver;
 769         int             rc;
 770         BerElement      tmpber, *ber;
 771         char            *orig_dn;
 772
 773         Debug( LDAP_DEBUG_TRACE,
 774             "re_encode_request: new msgid %d, new dn <%s>\n",
 775             msgid, ( *dnp == NULL ) ? "NONE" : *dnp, 0 );
 776
 777         tmpber = *origber;
 778
 779         /*
 780          * all LDAP requests are sequences that start with a message id,
 781          * followed by a sequence that is tagged with the operation code
 782          */
 783         if ( ber_scanf( &tmpber, "{i", &along ) != LDAP_TAG_MSGID ||
 784             ( tag = ber_skip_tag( &tmpber, &along )) == LBER_DEFAULT ) {
 785                 ld->ld_errno = LDAP_DECODING_ERROR;
 786                 return( NULL );
 787         }
 788
 789         if (( ber = ldap_alloc_ber_with_options( ld )) == NULLBER ) {
 790                 return( NULL );
 791         }
 792
 793         /* bind requests have a version number before the DN & other stuff */
 794         if ( tag == LDAP_REQ_BIND && ber_get_int( &tmpber, (long *)&ver ) ==
 795             LBER_DEFAULT ) {
 796                 ld->ld_errno = LDAP_DECODING_ERROR;
 797                 ber_free( ber, 1 );
 798                 return( NULL );
 799         }
 800
 801         /* the rest of the request is the DN followed by other stuff */
 802         if ( ber_get_stringa( &tmpber, &orig_dn ) == LBER_DEFAULT ) {
 803                 ber_free( ber, 1 );
 804                 return( NULL );
 805         }
 806
 807         if ( *dnp == NULL ) {
 808                 *dnp = orig_dn;
 809         } else {
 810                 free( orig_dn );
 811         }
 812
 813         if ( tag == LDAP_REQ_BIND ) {
 814                 rc = ber_printf( ber, "{it{is", msgid, tag, ver, *dnp );
 815         } else {
 816                 rc = ber_printf( ber, "{it{s", msgid, tag, *dnp );
 817         }
 818
 819         if ( rc == -1 ) {
 820                 ber_free( ber, 1 );
 821                 return( NULL );
 822         }
 823
 824         if ( ber_write( ber, tmpber.ber_ptr, ( tmpber.ber_end -
 825             tmpber.ber_ptr ), 0 ) != ( tmpber.ber_end - tmpber.ber_ptr ) ||
 826             ber_printf( ber, "}}" ) == -1 ) {
 827                 ld->ld_errno = LDAP_ENCODING_ERROR;
 828                 ber_free( ber, 1 );
 829                 return( NULL );
 830         }
 831
 832 #ifdef LDAP_DEBUG
 833         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
 834                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
 835                     0, 0, 0 );
 836                 ber_dump( ber, 0 );
 837         }
 838 #endif /* LDAP_DEBUG */
 839
 840         return( ber );
 841 }
 842
 843
 844 LDAPRequest *
 845 ldap_find_request_by_msgid( LDAP *ld, int msgid )
 846 {
 847         LDAPRequest     *lr;
 848
 849         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
 850                 if ( msgid == lr->lr_msgid ) {
 851                         break;
 852                 }
 853         }
 854
 855         return( lr );
 856 }
 857 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS */
 858
 859
 860 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 861 static LDAPServer *
 862 dn2servers( LDAP *ld, char *dn )        /* dn can also be a domain.... */
 863 {
 864         char            *p, *domain, *host, *server_dn, **dxs;
 865         int             i, port;
 866         LDAPServer      *srvlist, *prevsrv, *srv;
 867
 868         if (( domain = strrchr( dn, '@' )) != NULL ) {
 869                 ++domain;
 870         } else {
 871                 domain = dn;
 872         }
 873
 874         if (( dxs = ldap_getdxbyname( domain )) == NULL ) {
 875                 ld->ld_errno = LDAP_NO_MEMORY;
 876                 return( NULL );
 877         }
 878
 879         srvlist = NULL;
 880
 881         for ( i = 0; dxs[ i ] != NULL; ++i ) {
 882                 port = openldap_ldap_global_options.ldo_defport;
 883                 server_dn = NULL;
 884                 if ( strchr( dxs[ i ], ':' ) == NULL ) {
 885                         host = dxs[ i ];
 886                 } else if ( strlen( dxs[ i ] ) >= 7 &&
 887                     strncmp( dxs[ i ], "ldap://", 7 ) == 0 ) {
 888                         host = dxs[ i ] + 7;
 889                         if (( p = strchr( host, ':' )) == NULL ) {
 890                                 p = host;
 891                         } else {
 892                                 *p++ = '\0';
 893                                 port = atoi( p );
 894                         }
 895                         if (( p = strchr( p, '/' )) != NULL ) {
 896                                 server_dn = ++p;
 897                                 if ( *server_dn == '\0' ) {
 898                                         server_dn = NULL;
 899                                 }
 900                         }
 901                 } else {
 902                         host = NULL;
 903                 }
 904
 905                 if ( host != NULL ) {   /* found a server we can use */
 906                         if (( srv = (LDAPServer *)calloc( 1,
 907                             sizeof( LDAPServer ))) == NULL ) {
 908                                 free_servers( srvlist );
 909                                 srvlist = NULL;
 910                                 break;          /* exit loop & return */
 911                         }
 912
 913                         /* add to end of list of servers */
 914                         if ( srvlist == NULL ) {
 915                                 srvlist = srv;
 916                         } else {
 917                                 prevsrv->lsrv_next = srv;
 918                         }
 919                         prevsrv = srv;
 920
 921                         /* copy in info. */
 922                         if (( srv->lsrv_host = ldap_strdup( host )) == NULL ||
 923                             ( server_dn != NULL && ( srv->lsrv_dn =
 924                             ldap_strdup( server_dn )) == NULL )) {
 925                                 free_servers( srvlist );
 926                                 srvlist = NULL;
 927                                 break;          /* exit loop & return */
 928                         }
 929                         srv->lsrv_port = port;
 930                 }
 931         }
 932
 933         ldap_value_free( dxs );
 934
 935         if ( srvlist == NULL ) {
 936                 ld->ld_errno = LDAP_SERVER_DOWN;
 937         }
 938
 939         return( srvlist );
 940 }
 941 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */