96 lines
2.2 KiB
Go
96 lines
2.2 KiB
Go
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package main
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import (
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"encoding/binary"
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"gopkg.in/alecthomas/kingpin.v2"
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"fmt"
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"log"
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"net"
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"os"
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"time"
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)
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var (
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app = kingpin.New("tcpdelay", "Measure TCP delays")
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server = app.Command("server", "Run as server")
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listenAddress = server.Arg("address", "Address:port to listen on").String()
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client = app.Command("client", "Request measurement")
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serverAddress = client.Arg("address", "Address:port to connect to").String()
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)
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func tcpdelayServer() {
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ln, err := net.Listen("tcp", *listenAddress)
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if err != nil {
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log.Fatal("Cannot listen on ", *listenAddress, err)
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}
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log.Println("Listening on ", ln.Addr())
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for {
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conn, err := ln.Accept()
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log.Println("accepted connection")
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if err != nil {
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log.Fatal("Cannot accept on ", listenAddress, err)
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}
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o := 0
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t0 := time.Now()
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d, _ := time.ParseDuration("1s")
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te := t0.Add(d)
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buffer := make([]byte, 1024)
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for t := time.Now(); t.Before(te); t = time.Now() {
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copy(buffer[0:8], "tcpdelay")
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binary.BigEndian.PutUint64(buffer[8:], uint64(o))
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binary.BigEndian.PutUint64(buffer[16:], uint64(t.UnixNano()))
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n, err := conn.Write(buffer)
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if err != nil {
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log.Fatal("Cannot write on ", listenAddress, err)
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}
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if n != len(buffer) {
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log.Fatal("Wrote ", n, " bytes intead of ", len(buffer))
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}
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o += n
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}
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conn.Close()
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log.Println("closed connection")
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}
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}
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func tcpdelayClient() {
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conn, err := net.Dial("tcp", *serverAddress)
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if err != nil {
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log.Fatal("Cannot connect to ", *serverAddress, err)
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}
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o := 0
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buffer := make([]byte, 1024)
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for {
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n, err := conn.Read(buffer)
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if err != nil {
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log.Fatal("Cannot read from ", *serverAddress, err)
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}
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if n != len(buffer) {
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log.Fatal("Read ", n, " bytes intead of ", len(buffer))
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}
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tr := time.Now().UnixNano()
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if string(buffer[0:8]) != "tcpdelay" {
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log.Fatal("Unexpected magic ", buffer[0:8])
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}
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oSent := int(binary.BigEndian.Uint64(buffer[8:]))
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if oSent != o {
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log.Fatal("Unexpected offset ", oSent, " instead of ", o)
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}
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ts := binary.BigEndian.Uint64(buffer[16:])
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fmt.Println(o, ts, tr) // XXX - buffer for performance
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o += n
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}
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}
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func main() {
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switch kingpin.MustParse(app.Parse(os.Args[1:])) {
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case server.FullCommand():
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tcpdelayServer()
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case client.FullCommand():
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tcpdelayClient()
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}
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}
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