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openldap/libraries/libldap/request.c
Pierangelo Masarati eb005a9872 allow to muck with referrals while chasing...
2005-05-28 14:29:08 +00:00

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/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2005 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* Portions Copyright (c) 1995 Regents of the University of Michigan.
* All rights reserved.
*/
/* This notice applies to changes, created by or for Novell, Inc.,
* to preexisting works for which notices appear elsewhere in this file.
*
* Copyright (C) 1999, 2000 Novell, Inc. All Rights Reserved.
*
* THIS WORK IS SUBJECT TO U.S. AND INTERNATIONAL COPYRIGHT LAWS AND TREATIES.
* USE, MODIFICATION, AND REDISTRIBUTION OF THIS WORK IS SUBJECT TO VERSION
* 2.0.1 OF THE OPENLDAP PUBLIC LICENSE, A COPY OF WHICH IS AVAILABLE AT
* HTTP://WWW.OPENLDAP.ORG/LICENSE.HTML OR IN THE FILE "LICENSE" IN THE
* TOP-LEVEL DIRECTORY OF THE DISTRIBUTION. ANY USE OR EXPLOITATION OF THIS
* WORK OTHER THAN AS AUTHORIZED IN VERSION 2.0.1 OF THE OPENLDAP PUBLIC
* LICENSE, OR OTHER PRIOR WRITTEN CONSENT FROM NOVELL, COULD SUBJECT THE
* PERPETRATOR TO CRIMINAL AND CIVIL LIABILITY.
*---
* Modification to OpenLDAP source by Novell, Inc.
* April 2000 sfs Added code to chase V3 referrals
* request.c - sending of ldap requests; handling of referrals
*---
* Note: A verbatim copy of version 2.0.1 of the OpenLDAP Public License
* can be found in the file "build/LICENSE-2.0.1" in this distribution
* of OpenLDAP Software.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/stdlib.h>
#include <ac/errno.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/time.h>
#include <ac/unistd.h>
#include "ldap-int.h"
#include "lber.h"
static LDAPConn *find_connection LDAP_P(( LDAP *ld, LDAPURLDesc *srv, int any ));
static void use_connection LDAP_P(( LDAP *ld, LDAPConn *lc ));
static BerElement *
re_encode_request( LDAP *ld,
BerElement *origber,
ber_int_t msgid,
int sref,
LDAPURLDesc *srv,
int *type );
BerElement *
ldap_alloc_ber_with_options( LDAP *ld )
{
BerElement *ber;
if (( ber = ber_alloc_t( ld->ld_lberoptions )) == NULL ) {
ld->ld_errno = LDAP_NO_MEMORY;
}
return( ber );
}
void
ldap_set_ber_options( LDAP *ld, BerElement *ber )
{
ber->ber_options = ld->ld_lberoptions;
}
ber_int_t
ldap_send_initial_request(
LDAP *ld,
ber_tag_t msgtype,
const char *dn,
BerElement *ber,
ber_int_t msgid)
{
LDAPURLDesc *servers;
int rc;
Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
if ( ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, NULL ) == -1 ) {
/* not connected yet */
int rc = ldap_open_defconn( ld );
if( rc < 0 ) {
ber_free( ber, 1 );
return( -1 );
}
Debug( LDAP_DEBUG_TRACE,
"ldap_open_defconn: successful\n",
0, 0, 0 );
}
{
/*
* use of DNS is turned off or this is an X.500 DN...
* use our default connection
*/
servers = NULL;
}
#ifdef LDAP_CONNECTIONLESS
if (LDAP_IS_UDP(ld)) {
if (msgtype == LDAP_REQ_BIND) {
if (ld->ld_options.ldo_cldapdn)
ldap_memfree(ld->ld_options.ldo_cldapdn);
ld->ld_options.ldo_cldapdn = ldap_strdup(dn);
return 0;
}
if (msgtype != LDAP_REQ_ABANDON && msgtype != LDAP_REQ_SEARCH)
return LDAP_PARAM_ERROR;
}
#endif
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
#endif
rc = ldap_send_server_request( ld, ber, msgid, NULL,
servers, NULL, NULL );
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
#endif
if (servers)
ldap_free_urllist(servers);
return(rc);
}
int
ldap_int_flush_request(
LDAP *ld,
LDAPRequest *lr )
{
LDAPConn *lc = lr->lr_conn;
if ( ber_flush( lc->lconn_sb, lr->lr_ber, 0 ) != 0 ) {
if ( errno == EAGAIN ) {
/* need to continue write later */
lr->lr_status = LDAP_REQST_WRITING;
ldap_mark_select_write( ld, lc->lconn_sb );
ld->ld_errno = LDAP_BUSY;
return -2;
} else {
ld->ld_errno = LDAP_SERVER_DOWN;
ldap_free_request( ld, lr );
ldap_free_connection( ld, lc, 0, 0 );
return( -1 );
}
} else {
if ( lr->lr_parent == NULL ) {
lr->lr_ber->ber_end = lr->lr_ber->ber_ptr;
lr->lr_ber->ber_ptr = lr->lr_ber->ber_buf;
}
lr->lr_status = LDAP_REQST_INPROGRESS;
/* sent -- waiting for a response */
ldap_mark_select_read( ld, lc->lconn_sb );
}
return 0;
}
int
ldap_send_server_request(
LDAP *ld,
BerElement *ber,
ber_int_t msgid,
LDAPRequest *parentreq,
LDAPURLDesc *srvlist,
LDAPConn *lc,
LDAPreqinfo *bind )
{
LDAPRequest *lr;
int incparent, rc;
Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
incparent = 0;
ld->ld_errno = LDAP_SUCCESS; /* optimistic */
if ( lc == NULL ) {
if ( srvlist == NULL ) {
lc = ld->ld_defconn;
} else {
if (( lc = find_connection( ld, srvlist, 1 )) ==
NULL ) {
if ( (bind != NULL) && (parentreq != NULL) ) {
/* Remember the bind in the parent */
incparent = 1;
++parentreq->lr_outrefcnt;
}
lc = ldap_new_connection( ld, srvlist, 0, 1, bind );
}
}
}
if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
ber_free( ber, 1 );
if ( ld->ld_errno == LDAP_SUCCESS ) {
ld->ld_errno = LDAP_SERVER_DOWN;
}
if ( incparent ) {
/* Forget about the bind */
--parentreq->lr_outrefcnt;
}
return( -1 );
}
use_connection( ld, lc );
/* If we still have an incomplete write, try to finish it before
* dealing with the new request. If we don't finish here, return
* LDAP_BUSY and let the caller retry later. We only allow a single
* request to be in WRITING state.
*/
rc = 0;
if ( ld->ld_requests &&
ld->ld_requests->lr_status == LDAP_REQST_WRITING &&
ldap_int_flush_request( ld, ld->ld_requests ) < 0 ) {
rc = -1;
}
if ( rc ) return rc;
if (( lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ))) ==
NULL ) {
ld->ld_errno = LDAP_NO_MEMORY;
ldap_free_connection( ld, lc, 0, 0 );
ber_free( ber, 1 );
if ( incparent ) {
/* Forget about the bind */
--parentreq->lr_outrefcnt;
}
return( -1 );
}
lr->lr_msgid = msgid;
lr->lr_status = LDAP_REQST_INPROGRESS;
lr->lr_res_errno = LDAP_SUCCESS; /* optimistic */
lr->lr_ber = ber;
lr->lr_conn = lc;
if ( parentreq != NULL ) { /* sub-request */
if ( !incparent ) {
/* Increment if we didn't do it before the bind */
++parentreq->lr_outrefcnt;
}
lr->lr_origid = parentreq->lr_origid;
lr->lr_parentcnt = parentreq->lr_parentcnt + 1;
lr->lr_parent = parentreq;
lr->lr_refnext = parentreq->lr_child;
parentreq->lr_child = lr;
} else { /* original request */
lr->lr_origid = lr->lr_msgid;
}
if (( lr->lr_next = ld->ld_requests ) != NULL ) {
lr->lr_next->lr_prev = lr;
}
ld->ld_requests = lr;
lr->lr_prev = NULL;
ld->ld_errno = LDAP_SUCCESS;
if ( ldap_int_flush_request( ld, lr ) == -1 ) {
msgid = -1;
}
return( msgid );
}
LDAPConn *
ldap_new_connection( LDAP *ld, LDAPURLDesc *srvlist, int use_ldsb,
int connect, LDAPreqinfo *bind )
{
LDAPConn *lc;
LDAPURLDesc *srv;
Sockbuf *sb = NULL;
Debug( LDAP_DEBUG_TRACE, "ldap_new_connection\n", 0, 0, 0 );
/*
* make a new LDAP server connection
* XXX open connection synchronously for now
*/
if (( lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ))) == NULL ||
( !use_ldsb && ( (sb = ber_sockbuf_alloc()) == NULL ))) {
if ( lc != NULL ) {
LDAP_FREE( (char *)lc );
}
ld->ld_errno = LDAP_NO_MEMORY;
return( NULL );
}
lc->lconn_sb = ( use_ldsb ) ? ld->ld_sb : sb;
if ( connect ) {
for ( srv = srvlist; srv != NULL; srv = srv->lud_next ) {
if ( ldap_int_open_connection( ld, lc, srv, 0 ) != -1 ) {
break;
}
}
if ( srv == NULL ) {
if ( !use_ldsb ) {
ber_sockbuf_free( lc->lconn_sb );
}
LDAP_FREE( (char *)lc );
ld->ld_errno = LDAP_SERVER_DOWN;
return( NULL );
}
lc->lconn_server = ldap_url_dup(srv);
}
lc->lconn_status = LDAP_CONNST_CONNECTED;
lc->lconn_next = ld->ld_conns;
ld->ld_conns = lc;
/*
* XXX for now, we always do a synchronous bind. This will have
* to change in the long run...
*/
if ( bind != NULL) {
int err = 0;
LDAPConn *savedefconn;
/* Set flag to prevent additional referrals from being processed on this
* connection until the bind has completed
*/
lc->lconn_rebind_inprogress = 1;
/* V3 rebind function */
if ( ld->ld_rebind_proc != NULL) {
LDAPURLDesc *srvfunc;
if( ( srvfunc = ldap_url_dup( srvlist)) == NULL) {
ld->ld_errno = LDAP_NO_MEMORY;
err = -1;
} else {
savedefconn = ld->ld_defconn;
++lc->lconn_refcnt; /* avoid premature free */
ld->ld_defconn = lc;
Debug( LDAP_DEBUG_TRACE, "Call application rebind_proc\n", 0, 0, 0);
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
#endif
err = (*ld->ld_rebind_proc)( ld,
bind->ri_url, bind->ri_request, bind->ri_msgid,
ld->ld_rebind_params );
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
#endif
ld->ld_defconn = savedefconn;
--lc->lconn_refcnt;
if( err != 0) {
err = -1;
ldap_free_connection( ld, lc, 1, 0 );
lc = NULL;
}
ldap_free_urldesc( srvfunc);
}
} else {
savedefconn = ld->ld_defconn;
++lc->lconn_refcnt; /* avoid premature free */
ld->ld_defconn = lc;
Debug( LDAP_DEBUG_TRACE, "anonymous rebind via ldap_bind_s\n", 0, 0, 0);
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
#endif
if ( ldap_bind_s( ld, "", "", LDAP_AUTH_SIMPLE ) != LDAP_SUCCESS ) {
err = -1;
}
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
#endif
ld->ld_defconn = savedefconn;
--lc->lconn_refcnt;
if ( err != 0 ) {
ldap_free_connection( ld, lc, 1, 0 );
lc = NULL;
}
}
if( lc != NULL)
lc->lconn_rebind_inprogress = 0;
}
return( lc );
}
static LDAPConn *
find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
/*
* return an existing connection (if any) to the server srv
* if "any" is non-zero, check for any server in the "srv" chain
*/
{
LDAPConn *lc;
LDAPURLDesc *lcu, *lsu;
int lcu_port, lsu_port;
for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
lcu = lc->lconn_server;
lcu_port = ldap_pvt_url_scheme_port( lcu->lud_scheme,
lcu->lud_port );
for ( lsu = srv; lsu != NULL; lsu = lsu->lud_next ) {
lsu_port = ldap_pvt_url_scheme_port( lsu->lud_scheme,
lsu->lud_port );
if ( strcmp( lcu->lud_scheme, lsu->lud_scheme ) == 0
&& lcu->lud_host != NULL && *lcu->lud_host != '\0'
&& lsu->lud_host != NULL && *lsu->lud_host != '\0'
&& strcasecmp( lsu->lud_host, lcu->lud_host ) == 0
&& lsu_port == lcu_port )
{
return lc;
}
if ( !any ) break;
}
}
return NULL;
}
static void
use_connection( LDAP *ld, LDAPConn *lc )
{
++lc->lconn_refcnt;
lc->lconn_lastused = time( NULL );
}
void
ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
{
LDAPConn *tmplc, *prevlc;
Debug( LDAP_DEBUG_TRACE, "ldap_free_connection\n", 0, 0, 0 );
if ( force || --lc->lconn_refcnt <= 0 ) {
if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
ldap_mark_select_clear( ld, lc->lconn_sb );
if ( unbind ) {
ldap_send_unbind( ld, lc->lconn_sb, NULL, NULL );
}
}
if( lc->lconn_ber != NULL ) {
ber_free( lc->lconn_ber, 1 );
}
ldap_int_sasl_close( ld, lc );
prevlc = NULL;
for ( tmplc = ld->ld_conns; tmplc != NULL;
tmplc = tmplc->lconn_next ) {
if ( tmplc == lc ) {
if ( prevlc == NULL ) {
ld->ld_conns = tmplc->lconn_next;
} else {
prevlc->lconn_next = tmplc->lconn_next;
}
break;
}
prevlc = tmplc;
}
ldap_free_urllist( lc->lconn_server );
#ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
if ( lc->lconn_krbinstance != NULL ) {
LDAP_FREE( lc->lconn_krbinstance );
}
#endif
if ( lc->lconn_sb != ld->ld_sb ) {
ber_sockbuf_free( lc->lconn_sb );
}
if( lc->lconn_rebind_queue != NULL) {
int i;
for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++) {
LDAP_VFREE(lc->lconn_rebind_queue[i]);
}
LDAP_FREE( lc->lconn_rebind_queue);
}
LDAP_FREE( lc );
Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: actually freed\n",
0, 0, 0 );
} else {
lc->lconn_lastused = time( NULL );
Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
lc->lconn_refcnt, 0, 0 );
}
}
#ifdef LDAP_DEBUG
void
ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
{
LDAPConn *lc;
char timebuf[32];
fprintf( stderr, "** Connection%s:\n", all ? "s" : "" );
for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
if ( lc->lconn_server != NULL ) {
fprintf( stderr, "* host: %s port: %d%s\n",
( lc->lconn_server->lud_host == NULL ) ? "(null)"
: lc->lconn_server->lud_host,
lc->lconn_server->lud_port, ( lc->lconn_sb ==
ld->ld_sb ) ? " (default)" : "" );
}
fprintf( stderr, " refcnt: %d status: %s\n", lc->lconn_refcnt,
( lc->lconn_status == LDAP_CONNST_NEEDSOCKET ) ?
"NeedSocket" : ( lc->lconn_status ==
LDAP_CONNST_CONNECTING ) ? "Connecting" : "Connected" );
fprintf( stderr, " last used: %s",
ldap_pvt_ctime( &lc->lconn_lastused, timebuf ));
if( lc->lconn_rebind_inprogress ) {
fprintf( stderr, " rebind in progress\n");
if( lc->lconn_rebind_queue != NULL) {
int i = 0;
for( ;lc->lconn_rebind_queue[i] != NULL; i++) {
int j = 0;
for( ;lc->lconn_rebind_queue[i][j] != 0; j++) {
fprintf( stderr, " queue %d entry %d - %s\n",
i, j, lc->lconn_rebind_queue[i][j]);
}
}
} else {
fprintf( stderr, " queue is empty\n");
}
}
fprintf(stderr, "\n");
if ( !all ) {
break;
}
}
}
void
ldap_dump_requests_and_responses( LDAP *ld )
{
LDAPRequest *lr;
LDAPMessage *lm, *l;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
#endif
fprintf( stderr, "** Outstanding Requests:\n" );
if (( lr = ld->ld_requests ) == NULL ) {
fprintf( stderr, " Empty\n" );
}
for ( ; lr != NULL; lr = lr->lr_next ) {
fprintf( stderr, " * msgid %d, origid %d, status %s\n",
lr->lr_msgid, lr->lr_origid,
( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
( lr->lr_status == LDAP_REQST_WRITING) ? "Writing" :
( lr->lr_status == LDAP_REQST_COMPLETED ? "Request Completed" : "Invalid Status"));
fprintf( stderr, " outstanding referrals %d, parent count %d\n",
lr->lr_outrefcnt, lr->lr_parentcnt );
}
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
#endif
fprintf( stderr, "** Response Queue:\n" );
if (( lm = ld->ld_responses ) == NULL ) {
fprintf( stderr, " Empty\n" );
}
for ( ; lm != NULL; lm = lm->lm_next ) {
fprintf( stderr, " * msgid %d, type %lu\n",
lm->lm_msgid, (unsigned long) lm->lm_msgtype );
if (( l = lm->lm_chain ) != NULL ) {
fprintf( stderr, " chained responses:\n" );
for ( ; l != NULL; l = l->lm_chain ) {
fprintf( stderr,
" * msgid %d, type %lu\n",
l->lm_msgid,
(unsigned long) l->lm_msgtype );
}
}
}
}
#endif /* LDAP_DEBUG */
void
ldap_free_request_int( LDAP *ld, LDAPRequest *lr )
{
if ( lr->lr_prev == NULL ) {
ld->ld_requests = lr->lr_next;
} else {
lr->lr_prev->lr_next = lr->lr_next;
}
if ( lr->lr_next != NULL ) {
lr->lr_next->lr_prev = lr->lr_prev;
}
if ( lr->lr_ber != NULL ) {
ber_free( lr->lr_ber, 1 );
}
if ( lr->lr_res_error != NULL ) {
LDAP_FREE( lr->lr_res_error );
}
if ( lr->lr_res_matched != NULL ) {
LDAP_FREE( lr->lr_res_matched );
}
LDAP_FREE( lr );
}
void
ldap_free_request( LDAP *ld, LDAPRequest *lr )
{
LDAPRequest **ttmplr;
Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
lr->lr_origid, lr->lr_msgid, 0 );
/* free all referrals (child requests) */
while ( lr->lr_child )
ldap_free_request( ld, lr->lr_child );
if ( lr->lr_parent != NULL ) {
--lr->lr_parent->lr_outrefcnt;
for ( ttmplr = &lr->lr_parent->lr_child; *ttmplr && *ttmplr != lr; ttmplr = &(*ttmplr)->lr_refnext );
if ( *ttmplr == lr )
*ttmplr = lr->lr_refnext;
}
ldap_free_request_int( ld, lr );
}
/*
* call first time with *cntp = -1
* when returns *cntp == -1, no referrals are left
*
* NOTE: may replace *refsp, or shuffle the contents
* of the original array.
*/
static int ldap_int_nextref(
LDAP *ld,
char ***refsp,
int *cntp,
void *params )
{
assert( refsp != NULL );
assert( *refsp != NULL );
assert( cntp != NULL );
if ( *cntp < -1 ) {
*cntp = -1;
return -1;
}
(*cntp)++;
if ( (*refsp)[ *cntp ] == NULL ) {
*cntp = -1;
}
return 0;
}
/*
* Chase v3 referrals
*
* Parameters:
* (IN) ld = LDAP connection handle
* (IN) lr = LDAP Request structure
* (IN) refs = array of pointers to referral strings that we will chase
* The array will be free'd by this function when no longer needed
* (IN) sref != 0 if following search reference
* (OUT) errstrp = Place to return a string of referrals which could not be followed
* (OUT) hadrefp = 1 if sucessfully followed referral
*
* Return value - number of referrals followed
*/
int
ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
{
char *unfollowed;
int unfollowedcnt = 0;
LDAPRequest *origreq;
LDAPURLDesc *srv = NULL;
BerElement *ber;
char **refarray = NULL;
LDAPConn *lc;
int rc, count, i, j, id;
LDAPreqinfo rinfo;
ld->ld_errno = LDAP_SUCCESS; /* optimistic */
*hadrefp = 0;
Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
unfollowed = NULL;
rc = count = 0;
/* If no referrals in array, return */
if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
rc = 0;
goto done;
}
/* Check for hop limit exceeded */
if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
Debug( LDAP_DEBUG_ANY,
"more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
rc = -1;
goto done;
}
/* find original request */
for ( origreq = lr;
origreq->lr_parent != NULL;
origreq = origreq->lr_parent )
{
/* empty */ ;
}
refarray = refs;
refs = NULL;
if ( ld->ld_nextref_proc == NULL ) {
ld->ld_nextref_proc = ldap_int_nextref;
}
/* parse out & follow referrals */
i = -1;
for ( ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params );
i != -1;
ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params ) )
{
/* Parse the referral URL */
if (( rc = ldap_url_parse_ext( refarray[i], &srv)) != LDAP_SUCCESS) {
ld->ld_errno = rc;
rc = -1;
goto done;
}
if( srv->lud_crit_exts ) {
/* we do not support any extensions */
ld->ld_errno = LDAP_NOT_SUPPORTED;
rc = -1;
goto done;
}
/* treat ldap://hostpart and ldap://hostpart/ the same */
if ( srv->lud_dn && srv->lud_dn[0] == '\0' ) {
LDAP_FREE( srv->lud_dn );
srv->lud_dn = NULL;
}
/* check connection for re-bind in progress */
if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
if( lc->lconn_rebind_inprogress) {
/* We are already chasing a referral or search reference and a
* bind on that connection is in progress. We must queue
* referrals on that connection, so we don't get a request
* going out before the bind operation completes. This happens
* if two search references come in one behind the other
* for the same server with different contexts.
*/
Debug( LDAP_DEBUG_TRACE,
"ldap_chase_v3referrals: queue referral \"%s\"\n",
refarray[i], 0, 0);
if( lc->lconn_rebind_queue == NULL ) {
/* Create a referral list */
lc->lconn_rebind_queue =
(char ***) LDAP_MALLOC( sizeof(void *) * 2);
if( lc->lconn_rebind_queue == NULL) {
ld->ld_errno = LDAP_NO_MEMORY;
rc = -1;
goto done;
}
lc->lconn_rebind_queue[0] = refarray;
lc->lconn_rebind_queue[1] = NULL;
refarray = NULL;
} else {
/* Count how many referral arrays we already have */
for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
/* empty */;
}
/* Add the new referral to the list */
lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
if( lc->lconn_rebind_queue == NULL ) {
ld->ld_errno = LDAP_NO_MEMORY;
rc = -1;
goto done;
}
lc->lconn_rebind_queue[j] = refarray;
lc->lconn_rebind_queue[j+1] = NULL;
refarray = NULL;
}
/* We have queued the referral/reference, now just return */
rc = 0;
*hadrefp = 1;
count = 1; /* Pretend we already followed referral */
goto done;
}
}
/* Re-encode the request with the new starting point of the search.
* Note: In the future we also need to replace the filter if one
* was provided with the search reference
*/
/* For references we don't want old dn if new dn empty */
if ( sref && srv->lud_dn == NULL ) {
srv->lud_dn = LDAP_STRDUP( "" );
}
LDAP_NEXT_MSGID( ld, id );
ber = re_encode_request( ld, origreq->lr_ber, id,
sref, srv, &rinfo.ri_request );
if( ber == NULL ) {
ld->ld_errno = LDAP_ENCODING_ERROR;
rc = -1;
goto done;
}
Debug( LDAP_DEBUG_TRACE,
"ldap_chase_v3referral: msgid %d, url \"%s\"\n",
lr->lr_msgid, refarray[i], 0);
/* Send the new request to the server - may require a bind */
rinfo.ri_msgid = origreq->lr_origid;
rinfo.ri_url = refarray[i];
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
#endif
rc = ldap_send_server_request( ld, ber, id,
origreq, srv, NULL, &rinfo );
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
#endif
if ( rc < 0 ) {
/* Failure, try next referral in the list */
Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%s)\n",
refarray[i], ldap_err2string( ld->ld_errno ), 0);
unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i]);
ldap_free_urllist(srv);
srv = NULL;
} else {
/* Success, no need to try this referral list further */
rc = 0;
++count;
*hadrefp = 1;
/* check if there is a queue of referrals that came in during bind */
if( lc == NULL) {
if (( lc = find_connection( ld, srv, 1 )) == NULL ) {
ld->ld_errno = LDAP_OPERATIONS_ERROR;
rc = -1;
goto done;
}
}
if( lc->lconn_rebind_queue != NULL) {
/* Release resources of previous list */
LDAP_VFREE(refarray);
refarray = NULL;
ldap_free_urllist(srv);
srv = NULL;
/* Pull entries off end of queue so list always null terminated */
for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
;
}
refarray = lc->lconn_rebind_queue[j-1];
lc->lconn_rebind_queue[j-1] = NULL;
/* we pulled off last entry from queue, free queue */
if ( j == 1 ) {
LDAP_FREE( lc->lconn_rebind_queue);
lc->lconn_rebind_queue = NULL;
}
/* restart the loop the with new referral list */
i = -1;
continue;
}
break; /* referral followed, break out of for loop */
}
} /* end for loop */
done:
LDAP_VFREE(refarray);
ldap_free_urllist(srv);
LDAP_FREE( *errstrp );
if( rc == 0) {
*errstrp = NULL;
LDAP_FREE( unfollowed );
return count;
} else {
ld->ld_errno = LDAP_REFERRAL;
*errstrp = unfollowed;
return rc;
}
}
/*
* XXX merging of errors in this routine needs to be improved
*/
int
ldap_chase_referrals( LDAP *ld,
LDAPRequest *lr,
char **errstrp,
int sref,
int *hadrefp )
{
int rc, count, id;
unsigned len;
char *p, *ref, *unfollowed;
LDAPRequest *origreq;
LDAPURLDesc *srv;
BerElement *ber;
LDAPreqinfo rinfo;
Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
ld->ld_errno = LDAP_SUCCESS; /* optimistic */
*hadrefp = 0;
if ( *errstrp == NULL ) {
return( 0 );
}
len = strlen( *errstrp );
for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
*p = '\0';
p += LDAP_REF_STR_LEN;
break;
}
}
if ( len < LDAP_REF_STR_LEN ) {
return( 0 );
}
if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
Debug( LDAP_DEBUG_ANY,
"more than %d referral hops (dropping)\n",
ld->ld_refhoplimit, 0, 0 );
/* XXX report as error in ld->ld_errno? */
return( 0 );
}
/* find original request */
for ( origreq = lr; origreq->lr_parent != NULL;
origreq = origreq->lr_parent ) {
/* empty */;
}
unfollowed = NULL;
rc = count = 0;
/* parse out & follow referrals */
for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
if (( p = strchr( ref, '\n' )) != NULL ) {
*p++ = '\0';
} else {
p = NULL;
}
rc = ldap_url_parse_ext( ref, &srv );
if ( rc != LDAP_URL_SUCCESS ) {
Debug( LDAP_DEBUG_TRACE,
"ignoring unknown referral <%s>\n", ref, 0, 0 );
rc = ldap_append_referral( ld, &unfollowed, ref );
*hadrefp = 1;
continue;
}
if( srv->lud_dn != NULL && srv->lud_dn == '\0' ) {
LDAP_FREE( srv->lud_dn );
srv->lud_dn = NULL;
}
Debug( LDAP_DEBUG_TRACE,
"chasing LDAP referral: <%s>\n", ref, 0, 0 );
*hadrefp = 1;
LDAP_NEXT_MSGID( ld, id );
ber = re_encode_request( ld, origreq->lr_ber,
id, sref, srv, &rinfo.ri_request );
if( ber == NULL ) {
return -1 ;
}
/* copy the complete referral for rebind process */
rinfo.ri_url = LDAP_STRDUP( ref );
rinfo.ri_msgid = origreq->lr_origid;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
#endif
rc = ldap_send_server_request( ld, ber, id,
lr, srv, NULL, &rinfo );
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
#endif
LDAP_FREE( rinfo.ri_url );
if( rc >= 0 ) {
++count;
} else {
Debug( LDAP_DEBUG_ANY,
"Unable to chase referral (%s)\n",
ldap_err2string( ld->ld_errno ), 0, 0 );
rc = ldap_append_referral( ld, &unfollowed, ref );
}
ldap_free_urllist(srv);
}
LDAP_FREE( *errstrp );
*errstrp = unfollowed;
return(( rc == 0 ) ? count : rc );
}
int
ldap_append_referral( LDAP *ld, char **referralsp, char *s )
{
int first;
if ( *referralsp == NULL ) {
first = 1;
*referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
+ 1 );
} else {
first = 0;
*referralsp = (char *)LDAP_REALLOC( *referralsp,
strlen( *referralsp ) + strlen( s ) + 2 );
}
if ( *referralsp == NULL ) {
ld->ld_errno = LDAP_NO_MEMORY;
return( -1 );
}
if ( first ) {
strcpy( *referralsp, LDAP_REF_STR );
} else {
strcat( *referralsp, "\n" );
}
strcat( *referralsp, s );
return( 0 );
}
static BerElement *
re_encode_request( LDAP *ld,
BerElement *origber,
ber_int_t msgid,
int sref,
LDAPURLDesc *srv,
int *type )
{
/*
* XXX this routine knows way too much about how the lber library works!
*/
ber_int_t along;
ber_tag_t tag;
ber_tag_t rtag;
ber_int_t ver;
ber_int_t scope;
int rc;
BerElement tmpber, *ber;
char *orig_dn;
char *dn;
Debug( LDAP_DEBUG_TRACE,
"re_encode_request: new msgid %ld, new dn <%s>\n",
(long) msgid,
( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
tmpber = *origber;
/*
* all LDAP requests are sequences that start with a message id.
* For all except delete, this is followed by a sequence that is
* tagged with the operation code. For delete, the provided DN
* is not wrapped by a sequence.
*/
rtag = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
if ( rtag == LBER_ERROR ) {
ld->ld_errno = LDAP_DECODING_ERROR;
return( NULL );
}
assert( tag != 0);
if ( tag == LDAP_REQ_BIND ) {
/* bind requests have a version number before the DN & other stuff */
rtag = ber_scanf( &tmpber, "{ia" /*}*/, &ver, &orig_dn );
} else if ( tag == LDAP_REQ_DELETE ) {
/* delete requests don't have a DN wrapping sequence */
rtag = ber_scanf( &tmpber, "a", &orig_dn );
} else if ( tag == LDAP_REQ_SEARCH ) {
/* search requests need to be re-scope-ed */
rtag = ber_scanf( &tmpber, "{ae" /*"}"*/, &orig_dn, &scope );
if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
/* use the scope provided in reference */
scope = srv->lud_scope;
} else if ( sref ) {
/* use scope implied by previous operation
* base -> base
* one -> base
* subtree -> subtree
* subordinate -> subtree
*/
switch( scope ) {
default:
case LDAP_SCOPE_BASE:
case LDAP_SCOPE_ONELEVEL:
scope = LDAP_SCOPE_BASE;
break;
case LDAP_SCOPE_SUBTREE:
#ifdef LDAP_SCOPE_SUBORDINATE
case LDAP_SCOPE_SUBORDINATE:
#endif
scope = LDAP_SCOPE_SUBTREE;
break;
}
}
} else {
rtag = ber_scanf( &tmpber, "{a" /*}*/, &orig_dn );
}
if( rtag == LBER_ERROR ) {
ld->ld_errno = LDAP_DECODING_ERROR;
return NULL;
}
if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
return NULL;
}
if ( srv->lud_dn == NULL ) {
dn = orig_dn;
} else {
dn = srv->lud_dn;
}
if ( tag == LDAP_REQ_BIND ) {
rc = ber_printf( ber, "{it{is" /*}}*/, msgid, tag, ver, dn );
} else if ( tag == LDAP_REQ_DELETE ) {
rc = ber_printf( ber, "{itsN}", msgid, tag, dn );
} else if ( tag == LDAP_REQ_SEARCH ) {
rc = ber_printf( ber, "{it{se" /*}}*/, msgid, tag, dn, scope );
} else {
rc = ber_printf( ber, "{it{s" /*}}*/, msgid, tag, dn );
}
LDAP_FREE( orig_dn );
if ( rc == -1 ) {
ld->ld_errno = LDAP_ENCODING_ERROR;
ber_free( ber, 1 );
return NULL;
}
if ( tag != LDAP_REQ_DELETE && (
ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
!= ( tmpber.ber_end - tmpber.ber_ptr ) ||
ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
{
ld->ld_errno = LDAP_ENCODING_ERROR;
ber_free( ber, 1 );
return NULL;
}
#ifdef LDAP_DEBUG
if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
0, 0, 0 );
ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
}
#endif /* LDAP_DEBUG */
*type = tag; /* return request type */
return ber;
}
LDAPRequest *
ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
{
LDAPRequest *lr;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
#endif
for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
if( lr->lr_status == LDAP_REQST_COMPLETED ) {
continue; /* Skip completed requests */
}
if ( msgid == lr->lr_msgid ) {
break;
}
}
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
#endif
return( lr );
}
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