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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
// Package main implements an example DTLS client using a pre-shared key.
package main
import (
"context"
"fmt"
"net"
"time"
"github.com/pion/dtls/v3"
"github.com/pion/dtls/v3/examples/util"
)
func main() {
// Prepare the IP to connect to
addr := &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 4444}
//
// Everything below is the pion-DTLS API! Thanks for using it ❤️.
//
// Prepare the configuration of the DTLS connection
config := &dtls.Config{
PSK: func(hint []byte) ([]byte, error) {
fmt.Printf("Server's hint: %s \n", hint)
return []byte{0xAB, 0xC1, 0x23}, nil
},
PSKIdentityHint: []byte{},
CipherSuites: []dtls.CipherSuiteID{dtls.TLS_PSK_WITH_AES_128_CCM_8},
ExtendedMasterSecret: dtls.RequireExtendedMasterSecret,
}
// Connect to a DTLS server
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
dtlsConn, err := dtls.Dial("udp", addr, config)
util.Check(err)
defer func() {
util.Check(dtlsConn.Close())
}()
if err := dtlsConn.HandshakeContext(ctx); err != nil {
fmt.Printf("Failed to handshake with server: %v\n", err)
return
}
fmt.Println("Connected; type 'exit' to shutdown gracefully")
// Simulate a chat session
util.Chat(dtlsConn)
}
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