mir/bind
2
0
Fork 0
mirror of https://gitlab.isc.org/isc-projects/bind9 synced 2025-08-30 22:15:20 +00:00
Code Issues Releases Wiki Activity

2564. [bug] Only take EDNS fallback steps when processing timeouts.

Browse Source 
[RT #19405]
This commit is contained in:
Mark Andrews
2009-02-27 23:01:48 +00:00
parent 92e4603c55
commit 549e34bbf4
2 changed files with 12 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
CHANGES
View File

@@ -2,9 +2,8 @@
dns_rdata_hip_first(), dns_rdata_hip_next()
and dns_rdata_hip_current(). [RT #19384]
2564. [bug] 'named' was treating a TCP retry as a timeout when
deciding whether to perform a EDNS fallback step.
[RT #19393]
2564. [bug] Only take EDNS fallback steps when processing timeouts.
[RT #19405]
2563. [bug] Dig could leak a socket causing it to wait forever
to exit. [RT #19359]

15
lib/dns/resolver.c
View File

@@ -15,7 +15,7 @@
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: resolver.c,v 1.392 2009/02/25 22:46:05 marka Exp $ */
/* $Id: resolver.c,v 1.393 2009/02/27 23:01:48 marka Exp $ */
/*! \file */
@@ -229,6 +229,7 @@ struct fetchctx {
* is used for EDNS0 black hole detection.
*/
unsigned int timeouts;
/*%
* Look aside state for DS lookups.
*/
@@ -270,6 +271,7 @@ struct fetchctx {
unsigned int adberr;
unsigned int findfail;
unsigned int valfail;
isc_boolean_t timeout;
};
#define FCTX_MAGIC ISC_MAGIC('F', '!', '!', '!')
@@ -1639,9 +1641,8 @@ resquery_send(resquery_t *query) {
query->options |= DNS_FETCHOPT_NOEDNS0;
/*
* Handle UDP timeouts by reducing the UDP response size to 512
* bytes then if that doesn't work disabling EDNS (includes DO)
* and CD.
* Handle timeouts by reducing the UDP response size to 512 bytes
* then if that doesn't work disabling EDNS (includes DO) and CD.
*
* These timeout can be due to:
* * broken nameservers that don't respond to EDNS queries.
@@ -1653,7 +1654,7 @@ resquery_send(resquery_t *query) {
* or CD.
* * packet loss / link outage.
*/
if ((query->options & DNS_FETCHOPT_TCP) == 0) {
if (fctx->timeout) {
if ((triededns512(fctx, &query->addrinfo->sockaddr) ||
fctx->timeouts >= (MAX_EDNS0_TIMEOUTS * 2)) &&
(query->options & DNS_FETCHOPT_NOEDNS0) == 0) {
@@ -1666,6 +1667,7 @@ resquery_send(resquery_t *query) {
fctx->reason = "reducing the advertised EDNS UDP "
"packet size to 512 octets";
}
fctx->timeout = ISC_FALSE;
}
/*
@@ -3012,6 +3014,7 @@ fctx_timeout(isc_task_t *task, isc_event_t *event) {
isc_result_t result;
fctx->timeouts++;
fctx->timeout = ISC_TRUE;
/*
* We could cancel the running queries here, or we could let
* them keep going. Since we normally use separate sockets for
@@ -3358,6 +3361,7 @@ fctx_create(dns_resolver_t *res, dns_name_t *name, dns_rdatatype_t type,
fctx->reason = NULL;
fctx->rand_buf = 0;
fctx->rand_bits = 0;
fctx->timeout = ISC_FALSE;
dns_name_init(&fctx->nsname, NULL);
fctx->nsfetch = NULL;
@@ -5888,6 +5892,7 @@ resquery_response(isc_task_t *task, isc_event_t *event) {
}
fctx->timeouts = 0;
fctx->timeout = ISC_FALSE;
/*
* XXXRTH We should really get the current time just once. We