73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
|
package main
|
||
|
|
||
|
import (
|
||
|
"context"
|
||
|
"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 ❤️.
|
||
|
//
|
||
|
|
||
|
// Prepare the configuration of the DTLS connection
|
||
|
config := &dtls.Config{
|
||
|
PSK: func(hint []byte) ([]byte, error) {
|
||
|
fmt.Printf("Client's hint: %s \n", hint)
|
||
|
return []byte{0xAB, 0xC1, 0x23}, nil
|
||
|
},
|
||
|
PSKIdentityHint: []byte("Pion DTLS Client"),
|
||
|
CipherSuites: []dtls.CipherSuiteID{dtls.TLS_PSK_WITH_AES_128_CCM_8},
|
||
|
ExtendedMasterSecret: dtls.RequireExtendedMasterSecret,
|
||
|
// 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
|
||
|
if err == nil {
|
||
|
hub.Register(conn)
|
||
|
}
|
||
|
}
|
||
|
}()
|
||
|
|
||
|
// Start chatting
|
||
|
hub.Chat()
|
||
|
}
|