]> git.sur5r.net Git - openldap/blob - servers/slapd/cancel.c
ITS#6137: Fail Cancel(pending operation) instead of discarding the operation.
[openldap] / servers / slapd / cancel.c
1 /* cancel.c - LDAP cancel extended operation */
2 /* $OpenLDAP$ */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4  *
5  * Copyright 1998-2009 The OpenLDAP Foundation.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted only as authorized by the OpenLDAP
10  * Public License.
11  *
12  * A copy of this license is available in the file LICENSE in the
13  * top-level directory of the distribution or, alternatively, at
14  * <http://www.OpenLDAP.org/license.html>.
15  */
16
17 #include "portable.h"
18
19 #include <stdio.h>
20
21 #include <ac/socket.h>
22 #include <ac/string.h>
23 #include <ac/unistd.h>
24
25 #include "slap.h"
26
27 #include <lber_pvt.h>
28 #include <lutil.h>
29
30 const struct berval slap_EXOP_CANCEL = BER_BVC(LDAP_EXOP_CANCEL);
31
32 int cancel_extop( Operation *op, SlapReply *rs )
33 {
34         Operation *o;
35         int rc;
36         int opid;
37         BerElement *ber;
38
39         assert( ber_bvcmp( &slap_EXOP_CANCEL, &op->ore_reqoid ) == 0 );
40
41         if ( op->ore_reqdata == NULL ) {
42                 rs->sr_text = "no message ID supplied";
43                 return LDAP_PROTOCOL_ERROR;
44         }
45
46         ber = ber_init( op->ore_reqdata );
47         if ( ber == NULL ) {
48                 rs->sr_text = "internal error";
49                 return LDAP_OTHER;
50         }
51
52         if ( ber_scanf( ber, "{i}", &opid ) == LBER_ERROR ) {
53                 rs->sr_text = "message ID parse failed";
54                 return LDAP_PROTOCOL_ERROR;
55         }
56
57         (void) ber_free( ber, 1 );
58
59         Statslog( LDAP_DEBUG_STATS, "%s CANCEL msg=%d\n",
60                 op->o_log_prefix, opid, 0, 0, 0 );
61
62         if ( opid < 0 ) {
63                 rs->sr_text = "message ID invalid";
64                 return LDAP_PROTOCOL_ERROR;
65         }
66
67         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
68
69         LDAP_STAILQ_FOREACH( o, &op->o_conn->c_pending_ops, o_next ) {
70                 if ( o->o_msgid == opid ) {
71                         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
72                         /* TODO: We could instead remove the cancelled operation
73                          * from c_pending_ops like Abandon does, and send its
74                          * response here.  Not if it is pending because of a
75                          * congested connection though.
76                          */
77                         rs->sr_text = "too busy for Cancel, try Abandon instead";
78                         return LDAP_CANNOT_CANCEL;
79                 }
80         }
81
82         LDAP_STAILQ_FOREACH( o, &op->o_conn->c_ops, o_next ) {
83                 if ( o->o_msgid == opid ) {
84                         break;
85                 }
86         }
87
88         if ( o == NULL ) {
89                 rc = LDAP_NO_SUCH_OPERATION;
90                 rs->sr_text = "message ID not found";
91         } else if ( o->o_cancel != SLAP_CANCEL_NONE ) {
92                 rc = LDAP_PROTOCOL_ERROR;
93                 rs->sr_text = "message ID already being cancelled";
94         } else {
95                 rc = LDAP_SUCCESS;
96                 o->o_cancel = SLAP_CANCEL_REQ;
97                 o->o_abandon = 1;
98         }
99
100         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
101
102         if ( rc == LDAP_SUCCESS ) {
103                 LDAP_STAILQ_FOREACH( op->o_bd, &backendDB, be_next ) {
104                         if( !op->o_bd->be_cancel ) continue;
105
106                         op->oq_cancel.rs_msgid = opid;
107                         if ( op->o_bd->be_cancel( op, rs ) == LDAP_SUCCESS ) {
108                                 return LDAP_SUCCESS;
109                         }
110                 }
111
112                 while ( o->o_cancel == SLAP_CANCEL_REQ ) {
113                         ldap_pvt_thread_yield();
114                 }
115
116                 if ( o->o_cancel == SLAP_CANCEL_ACK ) {
117                         rc = LDAP_SUCCESS;
118                 } else {
119                         rc = o->o_cancel;
120                 }
121
122                 o->o_cancel = SLAP_CANCEL_DONE;
123         }
124
125         return rc;
126 }