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-rw-r--r--libraries/libldap/abandon.c460
1 files changed, 460 insertions, 0 deletions
diff --git a/libraries/libldap/abandon.c b/libraries/libldap/abandon.c
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+/* abandon.c */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 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) 1990 Regents of the University of Michigan.
+ * All rights reserved.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/stdlib.h>
+
+#include <ac/socket.h>
+#include <ac/string.h>
+#include <ac/time.h>
+
+#include "ldap-int.h"
+
+/*
+ * An abandon request looks like this:
+ * AbandonRequest ::= [APPLICATION 16] MessageID
+ * and has no response. (Source: RFC 4511)
+ */
+#include "lutil.h"
+
+static int
+do_abandon(
+ LDAP *ld,
+ ber_int_t origid,
+ ber_int_t msgid,
+ LDAPControl **sctrls,
+ int sendabandon );
+
+/*
+ * ldap_abandon_ext - perform an ldap extended abandon operation.
+ *
+ * Parameters:
+ * ld LDAP descriptor
+ * msgid The message id of the operation to abandon
+ * scntrls Server Controls
+ * ccntrls Client Controls
+ *
+ * ldap_abandon_ext returns a LDAP error code.
+ * (LDAP_SUCCESS if everything went ok)
+ *
+ * Example:
+ * ldap_abandon_ext( ld, msgid, scntrls, ccntrls );
+ */
+int
+ldap_abandon_ext(
+ LDAP *ld,
+ int msgid,
+ LDAPControl **sctrls,
+ LDAPControl **cctrls )
+{
+ int rc;
+
+ Debug( LDAP_DEBUG_TRACE, "ldap_abandon_ext %d\n", msgid, 0, 0 );
+
+ /* check client controls */
+ LDAP_MUTEX_LOCK( &ld->ld_req_mutex );
+
+ rc = ldap_int_client_controls( ld, cctrls );
+ if ( rc == LDAP_SUCCESS ) {
+ rc = do_abandon( ld, msgid, msgid, sctrls, 1 );
+ }
+
+ LDAP_MUTEX_UNLOCK( &ld->ld_req_mutex );
+
+ return rc;
+}
+
+
+/*
+ * ldap_abandon - perform an ldap abandon operation. Parameters:
+ *
+ * ld LDAP descriptor
+ * msgid The message id of the operation to abandon
+ *
+ * ldap_abandon returns 0 if everything went ok, -1 otherwise.
+ *
+ * Example:
+ * ldap_abandon( ld, msgid );
+ */
+int
+ldap_abandon( LDAP *ld, int msgid )
+{
+ Debug( LDAP_DEBUG_TRACE, "ldap_abandon %d\n", msgid, 0, 0 );
+ return ldap_abandon_ext( ld, msgid, NULL, NULL ) == LDAP_SUCCESS
+ ? 0 : -1;
+}
+
+
+int
+ldap_pvt_discard(
+ LDAP *ld,
+ ber_int_t msgid )
+{
+ int rc;
+
+ LDAP_MUTEX_LOCK( &ld->ld_req_mutex );
+ rc = do_abandon( ld, msgid, msgid, NULL, 0 );
+ LDAP_MUTEX_UNLOCK( &ld->ld_req_mutex );
+ return rc;
+}
+
+static int
+do_abandon(
+ LDAP *ld,
+ ber_int_t origid,
+ ber_int_t msgid,
+ LDAPControl **sctrls,
+ int sendabandon )
+{
+ BerElement *ber;
+ int i, err;
+ Sockbuf *sb;
+ LDAPRequest *lr;
+
+ Debug( LDAP_DEBUG_TRACE, "do_abandon origid %d, msgid %d\n",
+ origid, msgid, 0 );
+
+ /* find the request that we are abandoning */
+start_again:;
+ lr = ld->ld_requests;
+ while ( lr != NULL ) {
+ /* this message */
+ if ( lr->lr_msgid == msgid ) {
+ break;
+ }
+
+ /* child: abandon it */
+ if ( lr->lr_origid == msgid && !lr->lr_abandoned ) {
+ (void)do_abandon( ld, lr->lr_origid, lr->lr_msgid,
+ sctrls, sendabandon );
+
+ /* restart, as lr may now be dangling... */
+ goto start_again;
+ }
+
+ lr = lr->lr_next;
+ }
+
+ if ( lr != NULL ) {
+ if ( origid == msgid && lr->lr_parent != NULL ) {
+ /* don't let caller abandon child requests! */
+ ld->ld_errno = LDAP_PARAM_ERROR;
+ return( LDAP_PARAM_ERROR );
+ }
+ if ( lr->lr_status != LDAP_REQST_INPROGRESS ) {
+ /* no need to send abandon message */
+ sendabandon = 0;
+ }
+ }
+
+ /* ldap_msgdelete locks the res_mutex. Give up the req_mutex
+ * while we're in there.
+ */
+ LDAP_MUTEX_UNLOCK( &ld->ld_req_mutex );
+ err = ldap_msgdelete( ld, msgid );
+ LDAP_MUTEX_LOCK( &ld->ld_req_mutex );
+ if ( err == 0 ) {
+ ld->ld_errno = LDAP_SUCCESS;
+ return LDAP_SUCCESS;
+ }
+
+ /* fetch again the request that we are abandoning */
+ if ( lr != NULL ) {
+ for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
+ /* this message */
+ if ( lr->lr_msgid == msgid ) {
+ break;
+ }
+ }
+ }
+
+ err = 0;
+ if ( sendabandon ) {
+ if ( ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, NULL ) == -1 ) {
+ /* not connected */
+ err = -1;
+ ld->ld_errno = LDAP_SERVER_DOWN;
+
+ } else if ( ( ber = ldap_alloc_ber_with_options( ld ) ) == NULL ) {
+ /* BER element allocation failed */
+ err = -1;
+ ld->ld_errno = LDAP_NO_MEMORY;
+
+ } else {
+ /*
+ * We already have the mutex in LDAP_R_COMPILE, so
+ * don't try to get it again.
+ * LDAP_NEXT_MSGID(ld, i);
+ */
+
+ LDAP_NEXT_MSGID(ld, i);
+#ifdef LDAP_CONNECTIONLESS
+ if ( LDAP_IS_UDP(ld) ) {
+ struct sockaddr_storage sa = {0};
+ /* dummy, filled with ldo_peer in request.c */
+ err = ber_write( ber, (char *) &sa, sizeof(sa), 0 );
+ }
+ if ( LDAP_IS_UDP(ld) && ld->ld_options.ldo_version ==
+ LDAP_VERSION2 )
+ {
+ char *dn;
+ LDAP_MUTEX_LOCK( &ld->ld_options.ldo_mutex );
+ dn = ld->ld_options.ldo_cldapdn;
+ if (!dn) dn = "";
+ err = ber_printf( ber, "{isti", /* '}' */
+ i, dn,
+ LDAP_REQ_ABANDON, msgid );
+ LDAP_MUTEX_UNLOCK( &ld->ld_options.ldo_mutex );
+ } else
+#endif
+ {
+ /* create a message to send */
+ err = ber_printf( ber, "{iti", /* '}' */
+ i,
+ LDAP_REQ_ABANDON, msgid );
+ }
+
+ if ( err == -1 ) {
+ /* encoding error */
+ ld->ld_errno = LDAP_ENCODING_ERROR;
+
+ } else {
+ /* Put Server Controls */
+ if ( ldap_int_put_controls( ld, sctrls, ber )
+ != LDAP_SUCCESS )
+ {
+ err = -1;
+
+ } else {
+ /* close '{' */
+ err = ber_printf( ber, /*{*/ "N}" );
+
+ if ( err == -1 ) {
+ /* encoding error */
+ ld->ld_errno = LDAP_ENCODING_ERROR;
+ }
+ }
+ }
+
+ if ( err == -1 ) {
+ ber_free( ber, 1 );
+
+ } else {
+ /* send the message */
+ if ( lr != NULL ) {
+ assert( lr->lr_conn != NULL );
+ sb = lr->lr_conn->lconn_sb;
+ } else {
+ sb = ld->ld_sb;
+ }
+
+ if ( ber_flush2( sb, ber, LBER_FLUSH_FREE_ALWAYS ) != 0 ) {
+ ld->ld_errno = LDAP_SERVER_DOWN;
+ err = -1;
+ } else {
+ err = 0;
+ }
+ }
+ }
+ }
+
+ if ( lr != NULL ) {
+ LDAPConn *lc;
+ int freeconn = 0;
+ if ( sendabandon || lr->lr_status == LDAP_REQST_WRITING ) {
+ freeconn = 1;
+ lc = lr->lr_conn;
+ }
+ if ( origid == msgid ) {
+ ldap_free_request( ld, lr );
+
+ } else {
+ lr->lr_abandoned = 1;
+ }
+
+ if ( freeconn ) {
+ /* release ld_req_mutex while grabbing ld_conn_mutex to
+ * prevent deadlock.
+ */
+ LDAP_MUTEX_UNLOCK( &ld->ld_req_mutex );
+ LDAP_MUTEX_LOCK( &ld->ld_conn_mutex );
+ ldap_free_connection( ld, lc, 0, 1 );
+ LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex );
+ LDAP_MUTEX_LOCK( &ld->ld_req_mutex );
+ }
+ }
+
+ LDAP_MUTEX_LOCK( &ld->ld_abandon_mutex );
+
+ /* use bisection */
+ i = 0;
+ if ( ld->ld_nabandoned == 0 ||
+ ldap_int_bisect_find( ld->ld_abandoned, ld->ld_nabandoned, msgid, &i ) == 0 )
+ {
+ ldap_int_bisect_insert( &ld->ld_abandoned, &ld->ld_nabandoned, msgid, i );
+ }
+
+ if ( err != -1 ) {
+ ld->ld_errno = LDAP_SUCCESS;
+ }
+
+ LDAP_MUTEX_UNLOCK( &ld->ld_abandon_mutex );
+ return( ld->ld_errno );
+}
+
+/*
+ * ldap_int_bisect_find
+ *
+ * args:
+ * v: array of length n (in)
+ * n: length of array v (in)
+ * id: value to look for (in)
+ * idxp: pointer to location of value/insert point
+ *
+ * return:
+ * 0: not found
+ * 1: found
+ * -1: error
+ */
+int
+ldap_int_bisect_find( ber_int_t *v, ber_len_t n, ber_int_t id, int *idxp )
+{
+ int begin,
+ end,
+ rc = 0;
+
+ assert( id >= 0 );
+
+ begin = 0;
+ end = n - 1;
+
+ if ( n <= 0 || id < v[ begin ] ) {
+ *idxp = 0;
+
+ } else if ( id > v[ end ] ) {
+ *idxp = n;
+
+ } else {
+ int pos;
+ ber_int_t curid;
+
+ do {
+ pos = (begin + end)/2;
+ curid = v[ pos ];
+
+ if ( id < curid ) {
+ end = pos - 1;
+
+ } else if ( id > curid ) {
+ begin = ++pos;
+
+ } else {
+ /* already abandoned? */
+ rc = 1;
+ break;
+ }
+ } while ( end >= begin );
+
+ *idxp = pos;
+ }
+
+ return rc;
+}
+
+/*
+ * ldap_int_bisect_insert
+ *
+ * args:
+ * vp: pointer to array of length *np (in/out)
+ * np: pointer to length of array *vp (in/out)
+ * id: value to insert (in)
+ * idx: location of insert point (as computed by ldap_int_bisect_find())
+ *
+ * return:
+ * 0: inserted
+ * -1: error
+ */
+int
+ldap_int_bisect_insert( ber_int_t **vp, ber_len_t *np, int id, int idx )
+{
+ ber_int_t *v;
+ ber_len_t n;
+ int i;
+
+ assert( vp != NULL );
+ assert( np != NULL );
+ assert( idx >= 0 );
+ assert( (unsigned) idx <= *np );
+
+ n = *np;
+
+ v = ber_memrealloc( *vp, sizeof( ber_int_t ) * ( n + 1 ) );
+ if ( v == NULL ) {
+ return -1;
+ }
+ *vp = v;
+
+ for ( i = n; i > idx; i-- ) {
+ v[ i ] = v[ i - 1 ];
+ }
+ v[ idx ] = id;
+ ++(*np);
+
+ return 0;
+}
+
+/*
+ * ldap_int_bisect_delete
+ *
+ * args:
+ * vp: pointer to array of length *np (in/out)
+ * np: pointer to length of array *vp (in/out)
+ * id: value to delete (in)
+ * idx: location of value to delete (as computed by ldap_int_bisect_find())
+ *
+ * return:
+ * 0: deleted
+ */
+int
+ldap_int_bisect_delete( ber_int_t **vp, ber_len_t *np, int id, int idx )
+{
+ ber_int_t *v;
+ ber_len_t i, n;
+
+ assert( vp != NULL );
+ assert( np != NULL );
+ assert( idx >= 0 );
+ assert( (unsigned) idx < *np );
+
+ v = *vp;
+
+ assert( v[ idx ] == id );
+
+ --(*np);
+ n = *np;
+
+ for ( i = idx; i < n; i++ ) {
+ v[ i ] = v[ i + 1 ];
+ }
+
+ return 0;
+}
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