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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
// Package main implements an example DTLS server using self-signed certificates.
package main
import (
"context"
"crypto/tls"
"fmt"
"net"
"time"
"github.com/pion/dtls/v3"
"github.com/pion/dtls/v3/examples/util"
"github.com/pion/dtls/v3/pkg/crypto/selfsign"
)
func main() {
// Prepare the IP to connect to
addr := &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 4444}
// Generate a certificate and private key to secure the connection
certificate, genErr := selfsign.GenerateSelfSigned()
util.Check(genErr)
//
// Everything below is the pion-DTLS API! Thanks for using it ❤️.
//
// Prepare the configuration of the DTLS connection
config := &dtls.Config{
Certificates: []tls.Certificate{certificate},
ExtendedMasterSecret: dtls.RequireExtendedMasterSecret,
}
// Connect to a DTLS server
listener, err := dtls.Listen("udp", addr, config)
util.Check(err)
defer func() {
util.Check(listener.Close())
}()
fmt.Println("Listening")
// Simulate a chat session
hub := util.NewHub()
go func() {
for {
// Wait for a connection.
conn, err := listener.Accept()
util.Check(err)
// defer conn.Close() // TODO: graceful shutdown
// `conn` is of type `net.Conn` but may be casted to `dtls.Conn`
// using `dtlsConn := conn.(*dtls.Conn)` in order to to expose
// functions like `ConnectionState` etc.
// Perform the handshake with a 30-second timeout
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
dtlsConn, ok := conn.(*dtls.Conn)
if ok {
util.Check(dtlsConn.HandshakeContext(ctx))
}
cancel()
// Register the connection with the chat hub
if err == nil {
hub.Register(conn)
}
}
}()
// Start chatting
hub.Chat()
}
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