// Pack the dns.Msg and write to available connections (multicast)
func (c *client) sendQuery(msg *dns.Msg) error {
buf, err := msg.Pack()
if err != nil {
return err
}
if c.ipv4conn != nil {
c.ipv4conn.WriteTo(buf, ipv4Addr)
}
if c.ipv4conn != nil {
c.ipv4conn.WriteTo(buf, ipv6Addr)
}
return nil
}
// multicastResponse us used to send a multicast response packet
func (c *server) multicastResponse(msg *dns.Msg) error {
buf, err := msg.Pack()
if err != nil {
log.Println("Failed to pack message!")
return err
}
if c.ipv4conn != nil {
c.ipv4conn.WriteTo(buf, ipv4Addr)
}
if c.ipv6conn != nil {
c.ipv6conn.WriteTo(buf, ipv6Addr)
}
return nil
}
// sendResponse is used to send a unicast response packet
func (s *server) sendResponse(resp *dns.Msg, from net.Addr) error {
buf, err := resp.Pack()
if err != nil {
return err
}
addr := from.(*net.UDPAddr)
if addr.IP.To4() != nil {
_, err = s.ipv4conn.WriteToUDP(buf, addr)
return err
} else {
_, err = s.ipv6conn.WriteToUDP(buf, addr)
return err
}
}