73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
package main
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import (
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"context"
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"fmt"
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"net"
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"time"
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"github.com/pion/dtls/v2"
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"github.com/pion/dtls/v2/examples/util"
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)
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func main() {
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// Prepare the IP to connect to
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addr := &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 4444}
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// Create parent context to cleanup handshaking connections on exit.
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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//
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// Everything below is the pion-DTLS API! Thanks for using it ❤️.
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//
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// Prepare the configuration of the DTLS connection
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config := &dtls.Config{
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PSK: func(hint []byte) ([]byte, error) {
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fmt.Printf("Client's hint: %s \n", hint)
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return []byte{0xAB, 0xC1, 0x23}, nil
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},
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PSKIdentityHint: []byte("Pion DTLS Client"),
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CipherSuites: []dtls.CipherSuiteID{dtls.TLS_PSK_WITH_AES_128_CCM_8},
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ExtendedMasterSecret: dtls.RequireExtendedMasterSecret,
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// Create timeout context for accepted connection.
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ConnectContextMaker: func() (context.Context, func()) {
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return context.WithTimeout(ctx, 30*time.Second)
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},
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}
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// Connect to a DTLS server
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listener, err := dtls.Listen("udp", addr, config)
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util.Check(err)
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defer func() {
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util.Check(listener.Close())
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}()
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fmt.Println("Listening")
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// Simulate a chat session
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hub := util.NewHub()
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go func() {
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for {
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// Wait for a connection.
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conn, err := listener.Accept()
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util.Check(err)
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// defer conn.Close() // TODO: graceful shutdown
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// `conn` is of type `net.Conn` but may be casted to `dtls.Conn`
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// using `dtlsConn := conn.(*dtls.Conn)` in order to to expose
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// functions like `ConnectionState` etc.
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// Register the connection with the chat hub
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if err == nil {
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hub.Register(conn)
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}
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}
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}()
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// Start chatting
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hub.Chat()
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}
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