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treat SERVERFAILED as a timeout; from tor cvs via Nick Mathewson

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svn:r359
This commit is contained in:
Niels Provos 2007-05-28 21:17:35 +00:00
parent 5be24333ae
commit 28246587c0
1 changed files with 8 additions and 1 deletions
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9
evdns.c
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@ -698,7 +698,6 @@ reply_handle(struct request *const req, u16 flags, u32 ttl, struct reply *reply)
} }
switch(error) { switch(error) {
case DNS_ERR_SERVERFAILED:
case DNS_ERR_NOTIMPL: case DNS_ERR_NOTIMPL:
case DNS_ERR_REFUSED: case DNS_ERR_REFUSED:
// we regard these errors as marking a bad nameserver // we regard these errors as marking a bad nameserver
@ -710,6 +709,14 @@ reply_handle(struct request *const req, u16 flags, u32 ttl, struct reply *reply)
if (!request_reissue(req)) return; if (!request_reissue(req)) return;
} }
break; break;
case DNS_ERR_SERVERFAILED:
// rcode 2 (servfailed) sometimes means "we are broken" and
// sometimes (with some binds) means "that request was very
// confusing." Treat this as a timeout, not a failure.
log(EVDNS_LOG_DEBUG, "Got a SERVERFAILED from nameserver %s; "
"will allow the request to time out.",
debug_ntoa(req->ns->address));
break;
default: default:
// we got a good reply from the nameserver // we got a good reply from the nameserver
nameserver_up(req->ns); nameserver_up(req->ns);