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Handle some DDNS corner cases better. Maintain the DDNS transaction

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information when updating a lease and cancel any existing transactions
when removing the ddns information.
[ISC-Bugs #23103]
This commit is contained in:
Shawn Routhier 2011-02-18 18:18:20 +00:00
parent ef86959bc0
commit 919f14071d
3 changed files with 35 additions and 6 deletions
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5
RELNOTES
View File

@ -198,6 +198,11 @@ work on other platforms. Please report any problems and suggested fixes to
option 6rd 16 10 2001:: 1.2.3.4, 5.6.7.8;
- Handle some DDNS corner cases better. Maintain the DDNS transaction
information when updating a lease and cancel any existing transactions
when removing the ddns information.
[ISC-Bugs #23103]
Changes since 4.2.0b2
- Add declaration for variable in debug code in alloc.c. [ISC-Bugs #21472]

22
server/ddns.c
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@ -4,7 +4,7 @@
/*
*
* Copyright (c) 2009-2010 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 2009-2011 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 2004-2007 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 2000-2003 by Internet Software Consortium
*
@ -109,7 +109,7 @@ ddns_updates(struct packet *packet, struct lease *lease, struct lease *old,
}
} else if (lease6 != NULL) {
if ((old6 != NULL) && (old6->ddns_cb != NULL)) {
ddns_cancel(old->ddns_cb);
ddns_cancel(old6->ddns_cb);
old6->ddns_cb = NULL;
}
} else {
@ -1304,9 +1304,24 @@ ddns_removals(struct lease *lease,
isc_result_t rcode, execute_add = ISC_R_FAILURE;
struct binding_scope **scope = NULL;
int result = 0;
dhcp_ddns_cb_t *ddns_cb;
dhcp_ddns_cb_t *ddns_cb = NULL;
struct data_string leaseid;
/*
* Cancel any outstanding requests. When called
* from within the DNS code we probably will have
* already done the cancel but if called from outside
* - for example as part of a lease expiry - we won't.
*/
if ((lease != NULL) && (lease->ddns_cb != NULL)) {
ddns_cancel(lease->ddns_cb);
lease->ddns_cb = NULL;
} else if ((lease6 != NULL) && (lease6->ddns_cb != NULL)) {
ddns_cancel(lease6->ddns_cb);
lease6->ddns_cb = NULL;
} else
goto cleanup;
/* allocate our control block */
ddns_cb = ddns_cb_alloc(MDL);
if (ddns_cb == NULL) {
@ -1467,6 +1482,7 @@ ddns_removals(struct lease *lease,
* we allocated here.
*/
ddns_fwd_srv_connector(lease, lease6, scope, add_ddns_cb, execute_add);
if (ddns_cb != NULL)
ddns_cb_free(ddns_cb, MDL);
return(result);

10
server/mdb.c
View File

@ -3,6 +3,7 @@
Server-specific in-memory database support. */
/*
* Copyright (c) 2011 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 2004-2009 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996-2003 by Internet Software Consortium
*
@ -1225,7 +1226,14 @@ int supersede_lease (comp, lease, commit, propogate, pimmediate)
comp->ends = lease->ends;
comp->next_binding_state = lease->next_binding_state;
/* move the ddns control block information */
/*
* If we have a control block pointer copy it in.
* We don't zero out an older ponter as it is still
* in use. We shouldn't need to overwrite an
* old pointer with a new one as the old transaction
* should have been cancelled before getting here.
*/
if (lease->ddns_cb != NULL)
comp->ddns_cb = lease->ddns_cb;
just_move_it: