1 files changed, 42 insertions, 14 deletions
diff --git a/addr.go b/addr.go
index 080f11b..dc8c237 100644
--- a/addr.go
+++ b/addr.go
@@ -2,28 +2,56 @@ package main
 
 import (
 	"net"
-	"github.com/miekg/dns"
+	"github.com/vishvananda/netlink"
+	"fmt"
+	"log"
 )
 
-type Addr struct {
-	IP		net.IP
+type AddrSet struct {
+	addrs	map[string]net.IP
 }
 
-func (addr Addr) buildRR(name string, ttl int) dns.RR {
-	if ip4 := addr.IP.To4(); ip4 != nil {
-		return &dns.A{
-			Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: uint32(ttl)},
-			A:	 ip4,
-		}
+func (as *AddrSet) ScanInterface(iface string, family Family) error {
+	link, err := netlink.LinkByName(iface)
+	if err != nil {
+		return fmt.Errorf("netlink.LinkByName %v: %v", iface, err)
 	}
 
-	if ip6 := addr.IP.To16(); ip6 != nil {
-		return &dns.AAAA{
-			Hdr:  dns.RR_Header{Name: name, Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: uint32(ttl)},
-			AAAA: ip6,
-		}
+	addrList, err := netlink.AddrList(link, int(family))
+	if err != nil {
+		return fmt.Errorf("netlink.AddrList %v: %v", link, err)
+	}
+
+	// set
+	as.addrs = make(map[string]net.IP)
+
+	for _, addr := range addrList {
+		as.applyLinkAddr(link, addr)
 	}
 
 	return nil
 }
 
+func (as *AddrSet) applyLinkAddr(link netlink.Link, addr netlink.Addr) {
+	linkUp := link.Attrs().Flags & net.FlagUp != 0
+
+	if addr.Scope >= int(netlink.SCOPE_LINK) {
+		return
+	}
+
+	as.applyAddr(addr.IP, linkUp)
+}
+
+// Update state for address
+func (as *AddrSet) applyAddr(ip net.IP, up bool) {
+	if up {
+		log.Printf("update: up %v", ip)
+
+		as.addrs[ip.String()] = ip
+
+	} else {
+		log.Printf("update: down %v", ip)
+
+		delete(as.addrs, ip.String())
+	}
+}