func (r *RipRouter) ifClose(i int) {
p := r.ports[i]
log.Printf("RipRouter.ifDel: %s", p.iface.Name)
if err := sock.Leave(p.msock, r.group, p.iface); err != nil {
// warning only
log.Printf("RipRouter.ifClose: leave group error: %v", err)
}
sock.Close(p.msock) // break reader goroutine
}
func (r *RipRouter) Join(ifi *net.Interface) error {
ripPort := RIP_PORT
m, err1 := sock.MulticastListener(ripPort, ifi.Name)
if err1 != nil {
return fmt.Errorf("RipRouter.Join: open: %v", err1)
}
if err := sock.Join(m, r.group, ifi.Name); err != nil {
sock.Close(m)
return fmt.Errorf("RipRouter.Join: join: %v", err)
}
newPort := &port{iface: ifi, msock: m}
r.ports = append(r.ports, newPort)
go udpReader(m.P, r.input, ifi.Name, r.readerDone, ripPort)
r.readerCount++
return nil
}