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When retransmitting a timed-out DNS request, pick a fresh nameserver.

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Otherwise, requests initially sent to a failing nameserver would
stay there indefinitely, even if other nameservers would work.

Fix for sourceforge bug 3518439
This commit is contained in:
Nick Mathewson 2012-05-01 19:52:55 -04:00
parent d873d6787c
commit 3d9e52ac56
1 changed files with 4 additions and 0 deletions
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4
evdns.c
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@ -2161,9 +2161,13 @@ evdns_request_timeout_callback(evutil_socket_t fd, short events, void *arg) {
request_finished(req, &REQ_HEAD(req->base, req->trans_id), 1); request_finished(req, &REQ_HEAD(req->base, req->trans_id), 1);
} else { } else {
/* retransmit it */ /* retransmit it */
struct nameserver *new_ns;
log(EVDNS_LOG_DEBUG, "Retransmitting request %p; tx_count==%d", log(EVDNS_LOG_DEBUG, "Retransmitting request %p; tx_count==%d",
arg, req->tx_count); arg, req->tx_count);
(void) evtimer_del(&req->timeout_event); (void) evtimer_del(&req->timeout_event);
new_ns = nameserver_pick(base);
if (new_ns)
req->ns = new_ns;
evdns_request_transmit(req); evdns_request_transmit(req);
} }
EVDNS_UNLOCK(base); EVDNS_UNLOCK(base);