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dualstack-selection: force IPV4 when not found IPV6 in cache

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This commit is contained in:
Nick Peng
2020-02-15 19:00:46 +08:00
parent 8990446411
commit 3cf2d35c13
1 changed files with 9 additions and 0 deletions
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9
src/dns_server.c
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@@ -1962,6 +1962,15 @@ static int _dns_server_process_cache(struct dns_request *request)
dns_cache = dns_cache_lookup(request->domain, request->qtype);
if (dns_cache == NULL) {
if (request->dualstack_selection && request->qtype == DNS_T_AAAA) {
dns_cache_A = dns_cache_lookup(request->domain, DNS_T_A);
if (dns_cache_A) {
tlog(TLOG_DEBUG, "No IPV6 Found, Force IPV4 perfered.");
dns_cache_release(dns_cache_A);
dns_cache_release(dns_cache);
return _dns_server_reply_SOA(DNS_RC_NOERROR, request);
}
}
goto errout;
}