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package main
import (
"crypto/sha1"
"io"
"log"
"time"
"github.com/xtaci/kcp-go/v5"
"golang.org/x/crypto/pbkdf2"
)
func main() {
key := pbkdf2.Key([]byte("demo pass"), []byte("demo salt"), 1024, 32, sha1.New)
block, _ := kcp.NewAESBlockCrypt(key)
if listener, err := kcp.ListenWithOptions("127.0.0.1:12345", block, 10, 3); err == nil {
// spin-up the client
go client()
for {
s, err := listener.AcceptKCP()
if err != nil {
log.Fatal(err)
}
go handleEcho(s)
}
} else {
log.Fatal(err)
}
}
// handleEcho send back everything it received
func handleEcho(conn *kcp.UDPSession) {
buf := make([]byte, 4096)
for {
n, err := conn.Read(buf)
if err != nil {
log.Println(err)
return
}
n, err = conn.Write(buf[:n])
if err != nil {
log.Println(err)
return
}
}
}
func client() {
key := pbkdf2.Key([]byte("demo pass"), []byte("demo salt"), 1024, 32, sha1.New)
block, _ := kcp.NewAESBlockCrypt(key)
// wait for server to become ready
time.Sleep(time.Second)
// dial to the echo server
if sess, err := kcp.DialWithOptions("127.0.0.1:12345", block, 10, 3); err == nil {
for {
data := time.Now().String()
buf := make([]byte, len(data))
log.Println("sent:", data)
if _, err := sess.Write([]byte(data)); err == nil {
// read back the data
if _, err := io.ReadFull(sess, buf); err == nil {
log.Println("recv:", string(buf))
} else {
log.Fatal(err)
}
} else {
log.Fatal(err)
}
time.Sleep(time.Second)
}
} else {
log.Fatal(err)
}
}
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