From: Rafał Miłecki <ra...@milecki.pl>
When we receive PTR question it includes hostname (instance), e.g.:
mdnsd: parse_question (391): Q -> PTR lede._http._tcp.local
First of all we should check if it matches hostname we use before trying
to reply. Secondly service_reply expects service with domain appended
(without hostname/instance) so we need to strip received string out of
hostname before passing it.
Signed-off-by: Rafał Miłecki <ra...@milecki.pl>
---
dns.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/dns.c b/dns.c
index 91434f2..dac6f2c 100644
--- a/dns.c
+++ b/dns.c
@@ -367,9 +367,19 @@ parse_question(struct interface *iface, char *name, struct
dns_question *q)
break;
case TYPE_PTR:
- if (!strcmp(name, sdudp))
+ if (!strcmp(name, sdudp)) {
service_announce_services(iface, announce_ttl);
- service_reply(iface, name, announce_ttl);
+ } else {
+ /* First dot separates instance name from the rest */
+ char *dot = strchr(name, '.');
+ /* Length of queried instance */
+ size_t len = dot ? dot - name : 0;
+
+ /* Make sure it's query for the instance name we use */
+ if (len && len == strlen(mdns_hostname) &&
+ !strncmp(name, mdns_hostname, len))
+ service_reply(iface, dot + 1, announce_ttl);
+ }
break;
case TYPE_AAAA:
--
2.11.0
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