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main.go
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main.go
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package main
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"net"
"time"
"github.com/pion/dtls/v2"
"github.com/pion/dtls/v2/examples/util"
)
func main() {
// Prepare the IP to connect to
addr := &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 4444}
// Create parent context to cleanup handshaking connections on exit.
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
//
// Everything below is the pion-DTLS API! Thanks for using it ❤️.
//
certificate, err := util.LoadKeyAndCertificate("examples/certificates/server.pem",
"examples/certificates/server.pub.pem")
util.Check(err)
rootCertificate, err := util.LoadCertificate("examples/certificates/server.pub.pem")
util.Check(err)
certPool := x509.NewCertPool()
cert, err := x509.ParseCertificate(rootCertificate.Certificate[0])
util.Check(err)
certPool.AddCert(cert)
// Prepare the configuration of the DTLS connection
config := &dtls.Config{
Certificates: []tls.Certificate{certificate},
ExtendedMasterSecret: dtls.RequireExtendedMasterSecret,
ClientAuth: dtls.RequireAndVerifyClientCert,
ClientCAs: certPool,
// Create timeout context for accepted connection.
ConnectContextMaker: func() (context.Context, func()) {
return context.WithTimeout(ctx, 30*time.Second)
},
}
// 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.
// Register the connection with the chat hub
hub.Register(conn)
}
}()
// Start chatting
hub.Chat()
}