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647. [bug] Resolver queries sent after following multiple

Browse Source 
referrals had excessively long retransmission
                        timeouts due to incorrectly counting the referrals
                        as "restarts".
This commit is contained in:
Andreas Gustafsson
2001-01-02 20:46:07 +00:00
parent be171be179
commit 22dbaf9ad8
2 changed files with 24 additions and 7 deletions
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5
CHANGES
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@@ -1,4 +1,9 @@
647. [bug] Resolver queries sent after following multiple
referrals had excessively long retransmission
timeouts due to incorrectly counting the referrals
as "restarts".
646. [bug] The UnixWare ISC_PLATFORM_FIXIN6INADDR fix in isc/net.h
didn't _cleanly_ fix the problem it was trying to fix.

26
lib/dns/resolver.c
View File

@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: resolver.c,v 1.190 2001/01/02 18:51:07 gson Exp $ */
/* $Id: resolver.c,v 1.191 2001/01/02 20:46:07 gson Exp $ */
#include <config.h>
@@ -173,19 +173,26 @@ struct fetchctx {
dns_fwdpolicy_t fwdpolicy;
isc_sockaddrlist_t bad;
ISC_LIST(dns_validator_t) validators;
/*
* # of events we're waiting for.
* The number of events we're waiting for.
*/
unsigned int pending;
/*
* # of times we have started from the beginning
* of the name server set.
* The number of times we've "restarted" the current
* nameserver set. This acts as a failsafe to prevent
* us from pounding constantly on a particular set of
* servers that, for whatever reason, are not giving
* us useful responses, but are responding in such a
* way that they are not marked "bad".
*/
unsigned int restarts;
/*
* # of timeouts that have occurred since we last
* successfully received a response packet. This
* is used for EDNS0 black hole detectino.
* The number of timeouts that have occurred since we
* last successfully received a response packet. This
* is used for EDNS0 black hole detection.
*/
unsigned int timeouts;
};
@@ -4195,6 +4202,11 @@ resquery_response(isc_task_t *task, isc_event_t *event) {
*/
get_nameservers = ISC_TRUE;
keep_trying = ISC_TRUE;
/*
* We have a new set of name servers, and it
* has not experienced any restarts yet.
*/
fctx->restarts = 0;
result = ISC_R_SUCCESS;
} else if (result != ISC_R_SUCCESS) {
/*