implement down

cmd/dsnet.go

@@ -31,6 +31,7 @@ func main() {
 	case "report":
 
 	case "down":
+		dsnet.Down()
 
 	default:
 		help()

down.go

@@ -0,0 +1,24 @@
+package dsnet
+
+import (
+	"github.com/vishvananda/netlink"
+)
+
+func Down() {
+	conf := MustLoadDsnetConfig()
+	DelLink(conf)
+}
+
+func DelLink(conf *DsnetConfig) {
+	linkAttrs := netlink.NewLinkAttrs()
+	linkAttrs.Name = conf.InterfaceName
+
+	link := &netlink.GenericLink{
+		LinkAttrs: linkAttrs,
+	}
+
+	err := netlink.LinkDel(link)
+	if err != nil {
+		ExitFail("Could not delete interface '%s' (%v)", conf.InterfaceName, err)
+	}
+}