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main.go
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main.go
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package main
import (
"context"
"crypto/tls"
"fmt"
"log"
"net"
"os"
"strconv"
"strings"
"time"
"github.com/codepher/turn-dtls-client/util"
"github.com/pion/dtls/v2"
"github.com/pion/dtls/v2/pkg/crypto/selfsign"
"github.com/pion/logging"
"github.com/pion/turn/v2"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Name = "turn-dtls-client"
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "host",
Value: "192.168.21.4",
Usage: "TURN Server name.",
//Required: true,
},
cli.IntFlag{
Name: "port,p",
Value: 3478,
Usage: "Listening port.",
//Required: true,
},
cli.StringFlag{
Name: "user,u",
Value: "lg=123",
Usage: "A pair of username and password (e.g. \"user=pass\")",
},
cli.StringFlag{
Name: "realm",
Value: "pion.ly",
Usage: "Realm (defaults to \"pion.ly\")",
},
cli.BoolFlag{
Name: "ping",
},
}
app.Action = func(cli *cli.Context) {
cred := strings.SplitN(cli.String("user"), "=", 2)
host := cli.String("host")
port := cli.Int("port")
realm := cli.String("realm")
ping := cli.Bool("ping")
// 初始化 dtls
// Prepare the IP to connect to
addr := &net.UDPAddr{IP: net.ParseIP(host), Port: port}
// Generate a certificate and private key to secure the connection
certificate, genErr := selfsign.GenerateSelfSigned()
util.Check(genErr)
//
// Everything below is the pion-DTLS API! Thanks for using it ❤️.
//
// Prepare the configuration of the DTLS connection
config := &dtls.Config{
Certificates: []tls.Certificate{certificate},
InsecureSkipVerify: true,
ExtendedMasterSecret: dtls.RequestExtendedMasterSecret,
LoggerFactory: logging.NewDefaultLoggerFactory(),
}
// Connect to a DTLS server
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
dtlsConn, err := dtls.DialWithContext(ctx, "udp", addr, config)
util.Check(err)
defer func() {
util.Check(dtlsConn.Close())
}()
// 初始化 turn
turnServerAddr := fmt.Sprintf("%s:%d", host, port)
cfg := &turn.ClientConfig{
STUNServerAddr: turnServerAddr,
TURNServerAddr: turnServerAddr,
Conn: NewUdpDtls(dtlsConn),
Username: cred[0],
Password: cred[1],
Realm: realm,
LoggerFactory: logging.NewDefaultLoggerFactory(),
}
client, err := turn.NewClient(cfg)
if err != nil {
panic(err)
}
defer client.Close()
// Start listening on the conn provided.
err = client.Listen()
if err != nil {
panic(err)
}
// Allocate a relay socket on the TURN server. On success, it
// will return a net.PacketConn which represents the remote
// socket.
// turn server 返回的链接通道
relayConn, err := client.Allocate()
if err != nil {
panic(err)
}
defer func() {
if closeErr := relayConn.Close(); closeErr != nil {
panic(closeErr)
}
}()
// The relayConn's local address is actually the transport
// address assigned on the TURN server.
log.Printf("relayed-address=%s", relayConn.LocalAddr().String())
mappedAddr, err := client.SendBindingRequest()
util.Check(err)
_, err = relayConn.WriteTo([]byte("Hello world"), mappedAddr)
util.Check(err)
if !ping {
util.WriteFile("relay.port", relayConn.LocalAddr().String())
go ReadBind(relayConn, "relayc.port")
util.Check(err)
} else {
util.WriteFile("relayc.port", relayConn.LocalAddr().String())
relay, err := os.ReadFile("relay.port")
if err != nil {
util.Check(err)
}
addr := Bind(relayConn, string(relay))
go pingTo(addr, relayConn)
}
if !ping {
buf := make([]byte, 1600)
log.Println("relayConn:", relayConn.LocalAddr())
for {
n, from, readerErr := relayConn.ReadFrom(buf)
if readerErr != nil {
log.Println("readerErr:", readerErr)
break
}
log.Println("relayConn:msg:", string(buf[:n]))
log.Println("relayConn:from:", from.String())
// Echo back
if _, readerErr = relayConn.WriteTo(buf[:n], from); readerErr != nil {
log.Println("err:", readerErr)
break
}
}
} else {
buf := make([]byte, 1600)
i := 0
for {
i++
n, from, pingerErr := relayConn.ReadFrom(buf)
if pingerErr != nil {
break
}
msg := string(buf[:n])
fmt.Println("get msg", msg)
if sentAt, pingerErr := time.Parse(time.RFC3339Nano, msg); pingerErr == nil {
rtt := time.Since(sentAt)
log.Printf("%d:%d bytes from from %s time=%d ms\n", i, n, from.String(), int(rtt.Seconds()*1000))
}
}
}
}
err := app.Run(os.Args)
if err != nil {
fmt.Println("app run error:", err)
}
}
func pingTo(addr net.Addr, relayConn net.PacketConn) {
for i := 0; i < 10; i++ {
msg := time.Now().Format(time.RFC3339Nano)
fmt.Println("send msg:", msg)
fmt.Println("add:", addr.Network(), addr.String())
_, err := relayConn.WriteTo([]byte(msg), addr)
if err != nil {
panic(err)
}
// For simplicity, this example does not wait for the pong (reply).
// Instead, sleep 1 second.
time.Sleep(time.Second)
}
return
}
// 动态绑定
func ReadBind(relayConn net.PacketConn, filename string) {
oldRelay := ""
for {
relay, err := os.ReadFile(filename)
util.Check(err)
if oldRelay != string(relay) {
fmt.Println("new relay", string(relay))
oldRelay = string(relay)
Bind(relayConn, oldRelay)
}
time.Sleep(time.Second)
}
}
func Bind(relayConn net.PacketConn, relay string) net.Addr {
cred := strings.SplitN(relay, ":", 2)
port, _ := strconv.Atoi(cred[1])
fmt.Println("port", port)
add := &net.UDPAddr{IP: net.ParseIP(cred[0]), Port: port}
fmt.Println("add", add.String())
_, err := relayConn.WriteTo([]byte("Hello world"), add)
util.Check(err)
return add
}