Use underscores in file names (#1620)

Underscore these names.

core/dnsserver/server_tls.go

@@ -0,0 +1,80 @@
+package dnsserver
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net"
+
+	"github.com/miekg/dns"
+	"golang.org/x/net/context"
+)
+
+// ServerTLS represents an instance of a TLS-over-DNS-server.
+type ServerTLS struct {
+	*Server
+	tlsConfig *tls.Config
+}
+
+// NewServerTLS returns a new CoreDNS TLS server and compiles all plugin in to it.
+func NewServerTLS(addr string, group []*Config) (*ServerTLS, error) {
+	s, err := NewServer(addr, group)
+	if err != nil {
+		return nil, err
+	}
+	// The *tls* plugin must make sure that multiple conflicting
+	// TLS configuration return an error: it can only be specified once.
+	var tlsConfig *tls.Config
+	for _, conf := range s.zones {
+		// Should we error if some configs *don't* have TLS?
+		tlsConfig = conf.TLSConfig
+	}
+
+	return &ServerTLS{Server: s, tlsConfig: tlsConfig}, nil
+}
+
+// Serve implements caddy.TCPServer interface.
+func (s *ServerTLS) Serve(l net.Listener) error {
+	s.m.Lock()
+
+	if s.tlsConfig != nil {
+		l = tls.NewListener(l, s.tlsConfig)
+	}
+
+	// Only fill out the TCP server for this one.
+	s.server[tcp] = &dns.Server{Listener: l, Net: "tcp-tls", Handler: dns.HandlerFunc(func(w dns.ResponseWriter, r *dns.Msg) {
+		ctx := context.Background()
+		s.ServeDNS(ctx, w, r)
+	})}
+	s.m.Unlock()
+
+	return s.server[tcp].ActivateAndServe()
+}
+
+// ServePacket implements caddy.UDPServer interface.
+func (s *ServerTLS) ServePacket(p net.PacketConn) error { return nil }
+
+// Listen implements caddy.TCPServer interface.
+func (s *ServerTLS) Listen() (net.Listener, error) {
+	l, err := net.Listen("tcp", s.Addr[len(TransportTLS+"://"):])
+	if err != nil {
+		return nil, err
+	}
+	return l, nil
+}
+
+// ListenPacket implements caddy.UDPServer interface.
+func (s *ServerTLS) ListenPacket() (net.PacketConn, error) { return nil, nil }
+
+// OnStartupComplete lists the sites served by this server
+// and any relevant information, assuming Quiet is false.
+func (s *ServerTLS) OnStartupComplete() {
+	if Quiet {
+		return
+	}
+
+	out := startUpZones(TransportTLS+"://", s.Addr, s.zones)
+	if out != "" {
+		fmt.Print(out)
+	}
+	return
+}