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|
// Package main implements a TURN client with support for TCP
package main
import (
"flag"
"fmt"
"log"
"net"
"strings"
"time"
"github.com/pion/logging"
"github.com/pion/turn/v2"
)
func main() {
host := flag.String("host", "", "TURN Server name.")
port := flag.Int("port", 3478, "Listening port.")
user := flag.String("user", "", "A pair of username and password (e.g. \"user=pass\")")
realm := flag.String("realm", "pion.ly", "Realm (defaults to \"pion.ly\")")
ping := flag.Bool("ping", false, "Run ping test")
flag.Parse()
if len(*host) == 0 {
log.Fatalf("'host' is required")
}
if len(*user) == 0 {
log.Fatalf("'user' is required")
}
// Dial TURN Server
turnServerAddr := fmt.Sprintf("%s:%d", *host, *port)
conn, err := net.Dial("tcp", turnServerAddr)
if err != nil {
log.Panicf("Failed to connect to TURN server: %s", err)
}
cred := strings.SplitN(*user, "=", 2)
// Start a new TURN Client and wrap our net.Conn in a STUNConn
// This allows us to simulate datagram based communication over a net.Conn
cfg := &turn.ClientConfig{
STUNServerAddr: turnServerAddr,
TURNServerAddr: turnServerAddr,
Conn: turn.NewSTUNConn(conn),
Username: cred[0],
Password: cred[1],
Realm: *realm,
LoggerFactory: logging.NewDefaultLoggerFactory(),
}
client, err := turn.NewClient(cfg)
if err != nil {
log.Panicf("Failed to create TURN client: %s", err)
}
defer client.Close()
// Start listening on the conn provided.
err = client.Listen()
if err != nil {
log.Panicf("Failed to listen: %s", err)
}
// Allocate a relay socket on the TURN server. On success, it
// will return a net.PacketConn which represents the remote
// socket.
relayConn, err := client.Allocate()
if err != nil {
log.Panicf("Failed to allocate: %s", err)
}
defer func() {
if closeErr := relayConn.Close(); closeErr != nil {
log.Fatalf("Failed to close connection: %s", closeErr)
}
}()
// The relayConn's local address is actually the transport
// address assigned on the TURN server.
log.Printf("relayed-address=%s", relayConn.LocalAddr().String())
// If you provided `-ping`, perform a ping test against the
// relayConn we have just allocated.
if *ping {
err = doPingTest(client, relayConn)
if err != nil {
log.Panicf("Failed to ping: %s", err)
}
}
}
func doPingTest(client *turn.Client, relayConn net.PacketConn) error {
// Send BindingRequest to learn our external IP
mappedAddr, err := client.SendBindingRequest()
if err != nil {
return err
}
// Set up pinger socket (pingerConn)
pingerConn, err := net.ListenPacket("udp4", "0.0.0.0:0")
if err != nil {
log.Panicf("Failed to listen: %s", err)
}
defer func() {
if closeErr := pingerConn.Close(); closeErr != nil {
log.Panicf("Failed to close connection: %s", closeErr)
}
}()
// Punch a UDP hole for the relayConn by sending a data to the mappedAddr.
// This will trigger a TURN client to generate a permission request to the
// TURN server. After this, packets from the IP address will be accepted by
// the TURN server.
_, err = relayConn.WriteTo([]byte("Hello"), mappedAddr)
if err != nil {
return err
}
// Start read-loop on pingerConn
go func() {
buf := make([]byte, 1600)
for {
n, from, pingerErr := pingerConn.ReadFrom(buf)
if pingerErr != nil {
break
}
msg := string(buf[:n])
if sentAt, pingerErr := time.Parse(time.RFC3339Nano, msg); pingerErr == nil {
rtt := time.Since(sentAt)
log.Printf("%d bytes from from %s time=%d ms\n", n, from.String(), int(rtt.Seconds()*1000))
}
}
}()
// Start read-loop on relayConn
go func() {
buf := make([]byte, 1600)
for {
n, from, readerErr := relayConn.ReadFrom(buf)
if readerErr != nil {
break
}
// Echo back
if _, readerErr = relayConn.WriteTo(buf[:n], from); readerErr != nil {
break
}
}
}()
time.Sleep(500 * time.Millisecond)
// Send 10 packets from relayConn to the echo server
for i := 0; i < 10; i++ {
msg := time.Now().Format(time.RFC3339Nano)
_, err = pingerConn.WriteTo([]byte(msg), relayConn.LocalAddr())
if err != nil {
return err
}
// For simplicity, this example does not wait for the pong (reply).
// Instead, sleep 1 second.
time.Sleep(time.Second)
}
return nil
}
|
