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resolved: fix RR key reduction logic

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Fixes #2380.
This commit is contained in:
Lennart Poettering 2016-01-20 20:30:03 +01:00
parent cf7d1a30e4
commit ebc8a1066a
1 changed files with 12 additions and 7 deletions
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19
src/resolve/resolved-dns-packet.c
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@ -2094,7 +2094,7 @@ int dns_packet_extract(DnsPacket *p) {
n = DNS_PACKET_RRCOUNT(p);
if (n > 0) {
DnsResourceRecord *previous = NULL;
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *previous = NULL;
bool bad_opt = false;
answer = dns_answer_new(n);
@ -2150,12 +2150,12 @@ int dns_packet_extract(DnsPacket *p) {
}
if (has_rfc6975) {
/* OPT RR contains RFC6975 algorithm data, then this is indication that the
* server just copied the OPT it got from us (which contained that data) back
* into the reply. If so, then it doesn't properly support EDNS, as RFC6975
* makes it very clear that the algorithm data should only be contained in
* questions, never in replies. Crappy Belkin copy the OPT data for example,
* hence let's detect this so that we downgrade early. */
/* If the OPT RR contains RFC6975 algorithm data, then this is indication that
* the server just copied the OPT it got from us (which contained that data)
* back into the reply. If so, then it doesn't properly support EDNS, as
* RFC6975 makes it very clear that the algorithm data should only be contained
* in questions, never in replies. Crappy Belkin routers copy the OPT data for
* example, hence let's detect this so that we downgrade early. */
log_debug("OPT RR contained RFC6975 data, ignoring.");
bad_opt = true;
continue;
@ -2174,6 +2174,11 @@ int dns_packet_extract(DnsPacket *p) {
if (r < 0)
goto finish;
}
/* Remember this RR, so that we potentically can merge it's ->key object with the next RR. Note
* that we only do this if we actually decided to keep the RR around. */
dns_resource_record_unref(previous);
previous = dns_resource_record_ref(rr);
}
if (bad_opt)