cache: cache rdata of SRV-records as well

[project/mdnsd.git] / dns.c

diff --git a/dns.c b/dns.c
index 1ff5d53..c5323e5 100644 (file)
--- a/dns.c
+++ b/dns.c
@@ -299,6 +299,9 @@ parse_answer(struct interface *iface, uint8_t *buffer, int len, uint8_t **b, int
                return -1;
        }
 
+       if ((a->class & ~CLASS_FLUSH) != CLASS_IN)
+               return -1;
+
        rdata = *b;
        if (a->rdlength > *rlen) {
                fprintf(stderr, "dropping: bad question\n");
@@ -309,7 +312,7 @@ parse_answer(struct interface *iface, uint8_t *buffer, int len, uint8_t **b, int
        *b += a->rdlength;
 
        if (cache)
-               cache_answer(iface, buffer, len, name, a, rdata);
+               cache_answer(iface, buffer, len, name, a, rdata, a->class & CLASS_FLUSH);
 
        return 0;
 }
@@ -331,7 +334,7 @@ parse_question(struct interface *iface, char *name, struct dns_question *q)
                break;
 
        case TYPE_PTR:
-               service_announce_services(iface, name);
+               service_announce_services(iface, name, announce_ttl);
                service_reply(iface, name, announce_ttl);
                break;
 
@@ -341,13 +344,13 @@ parse_question(struct interface *iface, char *name, struct dns_question *q)
                if (host)
                        *host = '\0';
                if (!strcmp(mdns_hostname, name))
-                       service_reply_a(iface, q->type, announce_ttl);
+                       service_reply_a(iface, announce_ttl);
                break;
        };
 }
 
 void
-dns_handle_packet(struct interface *iface, uint8_t *buffer, int len, int unicast)
+dns_handle_packet(struct interface *iface, struct sockaddr *s, uint16_t port, uint8_t *buffer, int len)
 {
        struct dns_header *h;
        uint8_t *b = buffer;
@@ -359,6 +362,10 @@ dns_handle_packet(struct interface *iface, uint8_t *buffer, int len, int unicast
                return;
        }
 
+       if (h->questions && !iface->multicast && port != 5353)
+               // silently drop unicast questions that dont originate from port 5353  
+               return;
+
        while (h->questions-- > 0) {
                char *name = dns_consume_name(buffer, len, &b, &rlen);
                struct dns_question *q;