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e14e053d3d
* create pkg/reuseport Move the core server listening functions to a new package so plugins can use them. Also make *all* servers use the functions here; as only the udp/tcp listeners where using SO_REUSEPORT (if available). This is the only actual change in this PR; in it's core it's just a move of 2 files. This can also be used to cleanup the dance we're doing now for re-acquiring the sockets in e.g. the metrics plugins and the ready plugin. Signed-off-by: Miek Gieben <miek@miek.nl> * Also push a small doc update Signed-off-by: Miek Gieben <miek@miek.nl>
83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
package dnsserver
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import (
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"context"
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"crypto/tls"
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"fmt"
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"net"
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"github.com/coredns/coredns/plugin/pkg/reuseport"
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"github.com/coredns/coredns/plugin/pkg/transport"
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"github.com/miekg/dns"
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)
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// ServerTLS represents an instance of a TLS-over-DNS-server.
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type ServerTLS struct {
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*Server
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tlsConfig *tls.Config
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}
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// NewServerTLS returns a new CoreDNS TLS server and compiles all plugin in to it.
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func NewServerTLS(addr string, group []*Config) (*ServerTLS, error) {
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s, err := NewServer(addr, group)
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if err != nil {
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return nil, err
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}
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// The *tls* plugin must make sure that multiple conflicting
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// TLS configuration return an error: it can only be specified once.
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var tlsConfig *tls.Config
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for _, conf := range s.zones {
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// Should we error if some configs *don't* have TLS?
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tlsConfig = conf.TLSConfig
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}
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return &ServerTLS{Server: s, tlsConfig: tlsConfig}, nil
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}
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// Serve implements caddy.TCPServer interface.
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func (s *ServerTLS) Serve(l net.Listener) error {
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s.m.Lock()
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if s.tlsConfig != nil {
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l = tls.NewListener(l, s.tlsConfig)
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}
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// Only fill out the TCP server for this one.
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s.server[tcp] = &dns.Server{Listener: l, Net: "tcp-tls", Handler: dns.HandlerFunc(func(w dns.ResponseWriter, r *dns.Msg) {
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ctx := context.WithValue(context.Background(), Key{}, s.Server)
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s.ServeDNS(ctx, w, r)
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})}
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s.m.Unlock()
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return s.server[tcp].ActivateAndServe()
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}
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// ServePacket implements caddy.UDPServer interface.
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func (s *ServerTLS) ServePacket(p net.PacketConn) error { return nil }
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// Listen implements caddy.TCPServer interface.
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func (s *ServerTLS) Listen() (net.Listener, error) {
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l, err := reuseport.Listen("tcp", s.Addr[len(transport.TLS+"://"):])
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if err != nil {
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return nil, err
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}
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return l, nil
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}
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// ListenPacket implements caddy.UDPServer interface.
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func (s *ServerTLS) ListenPacket() (net.PacketConn, error) { return nil, nil }
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// OnStartupComplete lists the sites served by this server
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// and any relevant information, assuming Quiet is false.
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func (s *ServerTLS) OnStartupComplete() {
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if Quiet {
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return
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}
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out := startUpZones(transport.TLS+"://", s.Addr, s.zones)
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if out != "" {
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fmt.Print(out)
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}
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}
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