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Check TTL in known-answers list and only reply if it's less than half.

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This ensures we still update responders that do not remove records that are about to expire (with less than half of the actual TTL).
This commit is contained in:
Darell Tan 2012-10-17 21:57:15 +08:00
parent c821cdcbe4
commit ac1908875b
1 changed files with 3 additions and 1 deletions
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4
mdnsd.c
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@ -280,8 +280,10 @@ static int process_mdns_pkt(struct mdnsd *svr, struct mdns_pkt *pkt, struct mdns
struct rr_list *ans = NULL, *prev_ans = NULL;
for (ans = reply->rr_ans; ans; ) {
struct rr_list *next_ans = ans->next;
struct rr_entry *known_ans = rr_entry_match(pkt->rr_ans, ans->e);
if (rr_entry_match(pkt->rr_ans, ans->e)) {
// discard answers that have at least half of the actual TTL
if (known_ans != NULL && known_ans->ttl >= ans->e->ttl / 2) {
char *namestr = nlabel_to_str(ans->e->name);
DEBUG_PRINTF("removing answer for %s\n", namestr);
free(namestr);