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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
package dtls
import (
"net"
"github.com/pion/dtls/v3/internal/net/udp"
dtlsnet "github.com/pion/dtls/v3/pkg/net"
"github.com/pion/dtls/v3/pkg/protocol"
"github.com/pion/dtls/v3/pkg/protocol/recordlayer"
)
// Listen creates a DTLS listener.
func Listen(network string, laddr *net.UDPAddr, config *Config) (net.Listener, error) {
if err := validateConfig(config); err != nil {
return nil, err
}
lc := udp.ListenConfig{
AcceptFilter: func(packet []byte) bool {
pkts, err := recordlayer.UnpackDatagram(packet)
if err != nil || len(pkts) < 1 {
return false
}
h := &recordlayer.Header{}
if err := h.Unmarshal(pkts[0]); err != nil {
return false
}
return h.ContentType == protocol.ContentTypeHandshake
},
}
// If connection ID support is enabled, then they must be supported in
// routing.
if config.ConnectionIDGenerator != nil {
lc.DatagramRouter = cidDatagramRouter(len(config.ConnectionIDGenerator()))
lc.ConnectionIdentifier = cidConnIdentifier()
}
parent, err := lc.Listen(network, laddr)
if err != nil {
return nil, err
}
return &listener{
config: config,
parent: parent,
}, nil
}
// NewListener creates a DTLS listener which accepts connections from an inner Listener.
func NewListener(inner dtlsnet.PacketListener, config *Config) (net.Listener, error) {
if err := validateConfig(config); err != nil {
return nil, err
}
return &listener{
config: config,
parent: inner,
}, nil
}
// listener represents a DTLS listener.
type listener struct {
config *Config
parent dtlsnet.PacketListener
}
// Accept waits for and returns the next connection to the listener.
// You have to either close or read on all connection that are created.
func (l *listener) Accept() (net.Conn, error) {
c, raddr, err := l.parent.Accept()
if err != nil {
return nil, err
}
return Server(c, raddr, l.config)
}
// Close closes the listener.
// Any blocked Accept operations will be unblocked and return errors.
// Already Accepted connections are not closed.
func (l *listener) Close() error {
return l.parent.Close()
}
// Addr returns the listener's network address.
func (l *listener) Addr() net.Addr {
return l.parent.Addr()
}
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