+
+gboolean avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
+ AvahiInterfaceAddress *ia;
+
+ g_assert(i);
+ g_assert(a);
+
+ if (a->family != i->protocol)
+ return FALSE;
+
+ for (ia = i->addresses; ia; ia = ia->address_next) {
+
+ if (a->family == AVAHI_PROTO_INET) {
+ guint32 m;
+
+ m = ~(((guint32) -1) >> ia->prefix_len);
+
+ if ((g_ntohl(a->data.ipv4.address) & m) == (g_ntohl(ia->address.data.ipv4.address) & m))
+ return TRUE;
+ } else {
+ guint i;
+ guchar pl;
+ g_assert(a->family == AVAHI_PROTO_INET6);
+
+ pl = ia->prefix_len;
+
+ for (i = 0; i < 16; i++) {
+ guint8 m;
+
+ if (pl == 0)
+ return TRUE;
+
+ if (pl >= 8) {
+ m = 0xFF;
+ pl -= 8;
+ } else {
+ m = ~(0xFF >> pl);
+ pl = 0;
+ }
+
+ if ((a->data.ipv6.address[i] & m) != (ia->address.data.ipv6.address[i] & m))
+ break;
+ }
+ }
+ }
+
+ return FALSE;
+}