Rename project to umdns

[project/mdnsd.git] / dns.c

diff --git a/dns.c b/dns.c
index 63788f7..91434f2 100644 (file)
--- a/dns.c
+++ b/dns.c
@@ -15,6 +15,7 @@
 #include <sys/stat.h>
 
 #include <fcntl.h>
+#include <ifaddrs.h>
 #include <time.h>
 #include <stdio.h>
 #include <unistd.h>
@@ -180,6 +181,35 @@ dns_send_answer(struct interface *iface, const char *answer)
                fprintf(stderr, "failed to send question\n");
 }
 
+void
+dns_reply_a(struct interface *iface, int ttl)
+{
+       struct ifaddrs *ifap, *ifa;
+       struct sockaddr_in *sa;
+       struct sockaddr_in6 *sa6;
+
+       getifaddrs(&ifap);
+
+       dns_init_answer();
+       for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
+               if (strcmp(ifa->ifa_name, iface->name))
+                       continue;
+               if (ifa->ifa_addr->sa_family == AF_INET) {
+                       sa = (struct sockaddr_in *) ifa->ifa_addr;
+                       dns_add_answer(TYPE_A, (uint8_t *) &sa->sin_addr, 4, ttl);
+               }
+               if (ifa->ifa_addr->sa_family == AF_INET6) {
+                       uint8_t ll_prefix[] = {0xfe, 0x80 };
+                       sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
+                       if (!memcmp(&sa6->sin6_addr, &ll_prefix, 2))
+                               dns_add_answer(TYPE_AAAA, (uint8_t *) &sa6->sin6_addr, 16, ttl);
+               }
+       }
+       dns_send_answer(iface, mdns_hostname_local);
+
+       freeifaddrs(ifap);
+}
+
 static int
 scan_name(const uint8_t *buffer, int len)
 {
@@ -330,12 +360,15 @@ parse_question(struct interface *iface, char *name, struct dns_question *q)
 
        switch (q->type) {
        case TYPE_ANY:
-               if (!strcmp(name, mdns_hostname_local))
+               if (!strcmp(name, mdns_hostname_local)) {
                        service_reply(iface, NULL, announce_ttl);
+                       dns_reply_a(iface, announce_ttl);
+               }
                break;
 
        case TYPE_PTR:
-               service_announce_services(iface, name, announce_ttl);
+               if (!strcmp(name, sdudp))
+                       service_announce_services(iface, announce_ttl);
                service_reply(iface, name, announce_ttl);
                break;
 
@@ -345,7 +378,7 @@ parse_question(struct interface *iface, char *name, struct dns_question *q)
                if (host)
                        *host = '\0';
                if (!strcmp(mdns_hostname, name))
-                       service_reply_a(iface, announce_ttl);
+                       dns_reply_a(iface, announce_ttl);
                break;
        };
 }
@@ -364,7 +397,7 @@ dns_handle_packet(struct interface *iface, struct sockaddr *s, uint16_t port, ui
        }
 
        if (h->questions && !iface->multicast && port != 5353)
-               // silently drop unicast questions that dont originate from port 5353  
+               /* silently drop unicast questions that dont originate from port 5353 */
                return;
 
        while (h->questions-- > 0) {