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-rw-r--r--src/resolve/resolved-mdns.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/src/resolve/resolved-mdns.c b/src/resolve/resolved-mdns.c
index abe63d58c1..d6973a6999 100644
--- a/src/resolve/resolved-mdns.c
+++ b/src/resolve/resolved-mdns.c
@@ -86,7 +86,7 @@ static int on_mdns_packet(sd_event_source *s, int fd, uint32_t revents, void *us
}
if (dns_packet_validate_reply(p) > 0) {
- unsigned i;
+ DnsResourceRecord *rr;
log_debug("Got mDNS reply packet");
@@ -107,11 +107,15 @@ static int on_mdns_packet(sd_event_source *s, int fd, uint32_t revents, void *us
dns_scope_check_conflicts(scope, p);
- for (i = 0; i < p->answer->n_rrs; i++) {
- DnsResourceRecord *rr;
+ DNS_ANSWER_FOREACH(rr, p->answer) {
+ const char *name = DNS_RESOURCE_KEY_NAME(rr->key);
DnsTransaction *t;
- rr = p->answer->items[i].rr;
+ /* If the received reply packet contains ANY record that is not .local or .in-addr.arpa,
+ * we assume someone's playing tricks on us and discard the packet completely. */
+ if (!(dns_name_endswith(name, "in-addr.arpa") > 0 ||
+ dns_name_endswith(name, "local") > 0))
+ return 0;
t = dns_scope_find_transaction(scope, rr->key, false);
if (t)