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irtt_client.go
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irtt_client.go
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package nlmt
import (
"compress/gzip"
"context"
"encoding/json"
"fmt"
"io"
"os"
"os/signal"
"path"
"strconv"
"strings"
"syscall"
"text/tabwriter"
"time"
flag "github.com/ogier/pflag"
)
func clientUsage() {
setBufio()
printf("Usage: client [flags] host|host:port (see Host formats below)")
printf("")
printf("Flags:")
printf("------")
printf("")
printf("-d duration total time to send (default %s, see Duration units below)", DefaultDuration)
printf("-p frame path frame number shared memory path (default none)", DefaultFrameSourcePath)
printf("-y frame duration one frame duration, only used if <frame path> is set (default %f)", DefaultFrameDuration)
printf("-i interval send interval, if <frame path> is set, it must be multiples of frame duration (default %s, see Duration units below)", DefaultInterval)
printf("-f offset forces a send interval offset (default random, see Duration units below)")
printf("-l length length of packet (including irtt headers, default %d)", DefaultLength)
printf(" increased as necessary for irtt headers, common values:")
printf(" 1472 (max unfragmented size of IPv4 datagram for 1500 byte MTU)")
printf(" 1452 (max unfragmented size of IPv6 datagram for 1500 byte MTU)")
printf("-o file write JSON output to file (use '-' for stdout, use 'd' for default filename)")
printf(" if file has no extension, .json.gz is added, output is gzipped")
printf(" if extension is .json.gz, output is gzipped")
printf(" if extension is .gz, it's changed to .json.gz, output is gzipped")
printf(" if extension is .json, output is not gzipped")
printf(" output to stdout is not gzipped, pipe to gzip if needed")
printf("--outdir=dir output files directory folder (default %s)", DefaultOutputDir)
printf(" only applies if default file name is used.")
printf("-g group maximum %d chars group name, to group measurements at server side (default: %s)", maxGroupLen, DefaultGroup)
printf(" only applies if default file name is used.")
printf("-q quiet, suppress per-packet output")
printf("-Q really quiet, suppress all output except errors to stderr")
printf("-n no test, connect to the server and validate test parameters")
printf(" but don't run the test")
printf("--stats=stats server stats on received packets (default %s)", DefaultReceivedStats.String())
printf(" none: no server stats on received packets")
printf(" count: total count of received packets")
printf(" window: receipt status of last 64 packets with each reply")
printf(" both: both count and window")
printf("--tstamp=mode server timestamp mode (default %s)", DefaultStampAt.String())
printf(" none: request no timestamps")
printf(" send: request timestamp at server send")
printf(" receive: request timestamp at server receive")
printf(" both: request both send and receive timestamps")
printf(" midpoint: request midpoint timestamp (send/receive avg)")
printf("--tripm=mode packets trip mode (default %s)", DefaultTripMode.String())
printf(" round: round-trip")
printf(" oneway: only uplink")
printf("-m multiply send multiple packets at every interval (default %s)", DefaultMultiply)
printf("--clock=clock clock/s used for server timestamps (default %s)", DefaultClock)
printf(" wall: wall clock only")
printf(" monotonic: monotonic clock only")
printf(" both: both clocks")
printf("--dscp=dscp DSCP (ToS) value (default %s, 0x for hex), common values:", strconv.Itoa(DefaultDSCP))
printf(" 0 (Best effort)")
printf(" 0x10 (CS1- Bulk)")
printf(" 0xa0 (CS5- Video)")
printf(" 0xb8 (EF- Expedited forwarding)")
printf(" https://www.tucny.com/Home/dscp-tos")
printf("--df=DF setting for do not fragment (DF) bit in all packets")
printf(" default: OS default")
printf(" false: DF bit not set")
printf(" true: DF bit set")
printf("--wait=wait wait time at end of test for unreceived replies (default %s)", DefaultWait.String())
printf(" - Valid formats -")
for _, wfac := range WaiterFactories {
printf(" %s", wfac.Usage)
}
printf(" - Examples -")
printf(" 3x4s: 3 times max RTT, or 4 seconds if no response")
printf(" 1500ms: fixed 1500 milliseconds")
printf("--timer=timer timer for waiting to send packets (default %s)", DefaultTimer.String())
for _, tfac := range TimerFactories {
printf(" %s", tfac.Usage)
}
printf("--tcomp=alg comp timer averaging algorithm (default %s)", DefaultCompTimerAverage.String())
for _, afac := range AveragerFactories {
printf(" %s", afac.Usage)
}
printf("--fill=fill fill payload with given data (default none)")
printf(" none: leave payload as all zeroes")
for _, ffac := range FillerFactories {
printf(" %s", ffac.Usage)
}
printf("--fill-one fill only once and repeat for all packets")
printf("--sfill=fill request server fill (default not specified)")
printf(" see options for --fill")
printf(" server must support and allow this fill with --allow-fills")
printf("--local=addr local address (default from OS), valid formats:")
printf(" :port (all IPv4/IPv6 addresses with port)")
printf(" host (host with dynamic port, see Host formats below)")
printf(" host:port (host with specified port, see Host formats below)")
printf("--hmac=key add HMAC with key (0x for hex) to all packets, provides:")
printf(" dropping of all packets without a correct HMAC")
printf(" protection for server against unauthorized discovery and use")
printf("-4 IPv4 only")
printf("-6 IPv6 only")
printf("--timeouts=drs timeouts used when connecting to server (default %s)", DefaultOpenTimeouts.String())
printf(" comma separated list of durations (see Duration units below)")
printf(" total wait time will be up to the sum of these Durations")
printf(" max packets sent is up to the number of Durations")
printf(" minimum timeout duration is %s", minOpenTimeout)
printf("--ttl=ttl time to live (default %d, meaning use OS default)", DefaultTTL)
printf("--loose accept and use any server restricted test parameters instead")
printf(" of exiting with nonzero status")
printf("--thread lock sending and receiving goroutines to OS threads")
printf("-h show help")
printf("-v show version")
printf("")
hostUsage()
printf("")
durationUsage()
}
func hostUsage() {
printf("Host formats:")
printf("-------------")
printf("")
printf("Hosts may be either hostnames (for IPv4 or IPv6) or IP addresses. IPv6")
printf("addresses must be surrounded by brackets and may include a zone after the %%")
printf("character. Examples:")
printf("")
printf("IPv4 IP: 192.168.1.10")
printf("IPv6 IP: [fe80::426c:8fff:fe13:9feb%%en0]")
printf("IPv4/6 hostname: localhost")
printf("")
printf("Note: IPv6 addresses must be quoted in most shells.")
}
func durationUsage() {
printf("Duration units:")
printf("---------------")
printf("")
printf("Durations are a sequence of decimal numbers, each with optional fraction, and")
printf("unit suffix, such as: \"300ms\", \"1m30s\" or \"2.5m\". Sanity not enforced.")
printf("")
printf("h hours")
printf("m minutes")
printf("s seconds")
printf("ms milliseconds")
printf("ns nanoseconds")
}
// runClientCLI runs the client command line interface.
func runClientCLI(args []string) {
// client flags
fs := flag.NewFlagSet("client", flag.ContinueOnError)
fs.Usage = func() {
usageAndExit(clientUsage, exitCodeBadCommandLine)
}
var durationStr = fs.StringP("d", "d", DefaultDuration.String(), "total time to send")
var frameDurationStr = fs.StringP("y", "y", DefaultFrameDuration.String(), "frame duration in ms")
var intervalStr = fs.StringP("i", "i", DefaultInterval.String(), "send interval")
var intervalOffsetStr = fs.StringP("f", "f", DefaultIntervalOffset.String(), "send interval offset")
var length = fs.IntP("l", "l", DefaultLength, "packet length")
var noTest = fs.BoolP("n", "n", false, "no test")
var rsStr = fs.String("stats", DefaultReceivedStats.String(), "received stats")
var tsatStr = fs.String("tstamp", DefaultStampAt.String(), "stamp at")
var tmStr = fs.String("tripm", DefaultTripMode.String(), "trip mode")
var multiply = fs.IntP("m", "m", DefaultMultiply, "multiply packets")
var clockStr = fs.String("clock", DefaultClock.String(), "clock")
var frameSourcePath = fs.StringP("p", "p", DefaultFrameSourcePath, "frame number shared memory path")
var outputStr = fs.StringP("o", "o", "", "output file")
var outputDirStr = fs.String("outdir", DefaultOutputDir, "output directory")
var groupStr = fs.StringP("g", "g", "", "group name")
var quiet = fs.BoolP("q", "q", defaultQuiet, "quiet")
var reallyQuiet = fs.BoolP("Q", "Q", defaultReallyQuiet, "really quiet")
var dscpStr = fs.String("dscp", strconv.Itoa(DefaultDSCP), "dscp value")
var dfStr = fs.String("df", DefaultDF.String(), "do not fragment")
var waitStr = fs.String("wait", DefaultWait.String(), "wait")
var timerStr = fs.String("timer", DefaultTimer.String(), "timer")
var tcompStr = fs.String("tcomp", DefaultCompTimerAverage.String(),
"timer compensation algorithm")
var fillStr = fs.String("fill", "none", "fill")
var fillOne = fs.Bool("fill-one", false, "fill one")
var sfillStr = fs.String("sfill", "", "sfill")
var laddrStr = fs.String("local", DefaultLocalAddress, "local address")
var hmacStr = fs.String("hmac", defaultHMACKey, "HMAC key")
var ipv4 = fs.BoolP("4", "4", false, "IPv4 only")
var ipv6 = fs.BoolP("6", "6", false, "IPv6 only")
var timeoutsStr = fs.String("timeouts", DefaultOpenTimeouts.String(), "open timeouts")
var ttl = fs.Int("ttl", DefaultTTL, "IP time to live")
var loose = fs.Bool("loose", DefaultLoose, "loose")
var threadLock = fs.Bool("thread", DefaultThreadLock, "thread")
var version = fs.BoolP("version", "v", false, "version")
err := fs.Parse(args)
// start profiling, if enabled in build
if profileEnabled {
defer startProfile("./client.pprof").Stop()
}
// version
if *version {
runVersion(args)
os.Exit(0)
}
// parse duration
duration, err := time.ParseDuration(*durationStr)
if err != nil {
exitOnError(fmt.Errorf("%s (use s for seconds)", err),
exitCodeBadCommandLine)
}
// parse interval
interval, err := time.ParseDuration(*intervalStr)
if err != nil {
exitOnError(fmt.Errorf("%s (use s for seconds)", err),
exitCodeBadCommandLine)
}
// create frame source if exists
var frameSource *FrameSource = nil
var durationFrames float64 = float64(DefaultDurationFrames)
var intervalFrames float64 = float64(DefaultIntervalFrames)
if *frameSourcePath != "" {
// obtain duration in frames
frameDuration, err := time.ParseDuration(*frameDurationStr)
if err != nil {
exitOnError(fmt.Errorf("%s (use s for seconds)", err),
exitCodeBadCommandLine)
}
frameSource, err = NewFrameSource(*frameSourcePath, frameDuration)
if err != nil {
exitOnError(fmt.Errorf("unable to create shared memory frame source %s", *frameSourcePath),
exitCodeBadCommandLine)
return
}
// obtain test duration in frames
durationFrames = float64(duration.Milliseconds()) / float64(frameDuration.Milliseconds())
if durationFrames < 1 {
exitOnError(fmt.Errorf("duration %f ms smaller than one frame %f ms", float32(duration.Milliseconds()), float32(frameDuration.Milliseconds())),
exitCodeBadCommandLine)
}
// obtain packet intervals in frames
intervalFrames = float64(interval.Milliseconds()) / float64(frameDuration.Milliseconds())
if intervalFrames != float64(int64(intervalFrames)) {
exitOnError(fmt.Errorf("interval %f ms must be a multiple of frame duration %f ms", float32(interval.Milliseconds()), float32(frameDuration.Milliseconds())),
exitCodeBadCommandLine)
}
}
// parse interval offset
intervalOffset, err := time.ParseDuration(*intervalOffsetStr)
if err != nil {
exitOnError(fmt.Errorf("%s (use s for seconds)", err),
exitCodeBadCommandLine)
}
// determine IP version
ipVer := IPVersionFromBooleans(*ipv4, *ipv6, DualStack)
// parse DSCP
dscp, err := strconv.ParseInt(*dscpStr, 0, 32)
exitOnError(err, exitCodeBadCommandLine)
// parse DF
df, err := ParseDF(*dfStr)
exitOnError(err, exitCodeBadCommandLine)
// parse wait
waiter, err := NewWaiter(*waitStr)
exitOnError(err, exitCodeBadCommandLine)
// parse received stats
rs, err := ParseReceivedStats(*rsStr)
exitOnError(err, exitCodeBadCommandLine)
// parse timestamp string
at, err := ParseStampAt(*tsatStr)
exitOnError(err, exitCodeBadCommandLine)
// parse trip mode string
tm, err := ParseTripMode(*tmStr)
exitOnError(err, exitCodeBadCommandLine)
// parse clock
clock, err := ParseClock(*clockStr)
exitOnError(err, exitCodeBadCommandLine)
// parse timer compensation
timerComp, err := NewAverager(*tcompStr)
exitOnError(err, exitCodeBadCommandLine)
// parse timer
timer, err := NewTimer(*timerStr, timerComp)
exitOnError(err, exitCodeBadCommandLine)
// parse fill
filler, err := NewFiller(*fillStr)
exitOnError(err, exitCodeBadCommandLine)
// parse open timeouts
timeouts, err := ParseDurations(*timeoutsStr)
if err != nil {
exitOnError(fmt.Errorf("%s (use s for seconds)", err),
exitCodeBadCommandLine)
}
// parse group string
group, err := ParseGroup(*groupStr)
if err != nil {
exitOnError(fmt.Errorf("%s", err),
exitCodeBadCommandLine)
}
// parse HMAC key
var hmacKey []byte
if *hmacStr != "" {
hmacKey, err = decodeHexOrNot(*hmacStr)
exitOnError(err, exitCodeBadCommandLine)
}
// check for remote address argument
if len(fs.Args()) != 1 {
usageAndExit(clientUsage, exitCodeBadCommandLine)
}
raddrStr := fs.Args()[0]
// send regular output to stderr if json going to stdout
if *outputStr == "-" {
printTo = os.Stderr
}
// create context
ctx, cancel := context.WithCancel(context.Background())
// install signal handler to cancel context, which stops the test
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, os.Interrupt, syscall.SIGTERM)
go func() {
sig := <-sigs
if !*reallyQuiet {
printf("%s", sig)
}
cancel()
sig = <-sigs
if !*reallyQuiet {
printf("second interrupt, exiting")
}
os.Exit(exitCodeDoubleSignal)
}()
// create config
cfg := NewClientConfig()
cfg.LocalAddress = *laddrStr
cfg.RemoteAddress = raddrStr
cfg.OpenTimeouts = timeouts
cfg.NoTest = *noTest
cfg.Duration = duration
cfg.Interval = interval
cfg.FrameSource = frameSource
cfg.DurationFrames = int(durationFrames)
cfg.IntervalFrames = int(intervalFrames)
cfg.Length = *length
cfg.ReceivedStats = rs
cfg.StampAt = at
cfg.TripMode = tm
cfg.Multiply = *multiply
cfg.Clock = clock
cfg.Group = group
cfg.DSCP = int(dscp)
cfg.ServerFill = *sfillStr
cfg.Loose = *loose
cfg.IPVersion = ipVer
cfg.DF = df
cfg.TTL = int(*ttl)
cfg.Timer = timer
cfg.Waiter = waiter
cfg.Filler = filler
cfg.FillOne = *fillOne
cfg.HMACKey = hmacKey
cfg.Handler = &clientHandler{*quiet, *reallyQuiet}
cfg.ThreadLock = *threadLock
cfg.IntervalOffset = intervalOffset
// run test
c := NewClient(cfg)
r, err := c.Run(ctx)
if err != nil {
exitOnError(err, exitCodeRuntimeError)
}
// exit if NoTest set
if cfg.NoTest {
return
}
// print results
if !*reallyQuiet {
printResult(r)
}
if *outputStr == "d" {
// check output directory, create it if it does not exist
_, err := os.Stat(*outputDirStr)
if os.IsNotExist(err) {
// Directory does not exist, so create it
err := os.MkdirAll(*outputDirStr, os.ModePerm)
if err != nil {
fmt.Println("Error creating output directory:", err)
return
}
fmt.Println("Output directory created successfully!")
} else if err != nil {
fmt.Println("Error checking output directory:", err)
return
} else {
fmt.Println("Output directory already exists.")
}
// create file address
// Combine directory and filename to form a complete file address
if cfg.TripMode == TMRound {
*outputStr = path.Join(*outputDirStr, replaceXWithIPPortDateTime(r.NetAddr, DefaultJSONAddrFormat, "rt"))
} else {
*outputStr = path.Join(*outputDirStr, replaceXWithIPPortDateTime(r.NetAddr, DefaultJSONAddrFormat, "cl"))
}
}
if *outputStr != "" {
if err := writeResultJSON(r, *outputStr, ctx.Err() != nil); err != nil {
exitOnError(err, exitCodeRuntimeError)
}
}
// close the frame source
if c.FrameSource != nil {
c.FrameSource.Close()
}
}
func printResult(r *Result) {
// set some stat variables for later brevity
rtts := r.RTTStats
rttvs := r.RoundTripIPDVStats
sds := r.SendDelayStats
svs := r.SendIPDVStats
rds := r.ReceiveDelayStats
rvs := r.ReceiveIPDVStats
ss := r.SendCallStats
tes := r.TimerErrorStats
sps := r.ServerProcessingTimeStats
if r.SendErr != nil {
if r.SendErr != context.Canceled {
printf("\nTerminated due to send error: %s", r.SendErr)
}
}
if r.ReceiveErr != nil {
printf("\nTerminated due to receive error: %s", r.ReceiveErr)
}
printf("")
printStats := func(title string, s DurationStats) {
if s.N > 0 {
var med string
if m, ok := s.Median(); ok {
med = rdur(m).String()
}
printf("%s\t%s\t%s\t%s\t%s\t%s\t", title, rdur(s.Min), rdur(s.Mean()),
med, rdur(s.Max), rdur(s.Stddev()))
}
}
setTabWriter(tabwriter.AlignRight)
printf("\tMin\tMean\tMedian\tMax\tStddev\t")
printf("\t---\t----\t------\t---\t------\t")
printStats("RTT", rtts)
printStats("send delay", sds)
printStats("receive delay", rds)
printf("\t\t\t\t\t\t")
printStats("IPDV (jitter)", rttvs)
printStats("send IPDV", svs)
printStats("receive IPDV", rvs)
printf("\t\t\t\t\t\t")
printStats("send call time", ss)
printStats("timer error", tes)
printStats("server proc. time", sps)
printf("")
printf(" duration: %s (wait %s)", rdur(r.Duration), rdur(r.Wait))
printf(" packets sent/received: %d/%d (%.2f%% loss)", r.PacketsSent,
r.PacketsReceived, r.PacketLossPercent)
if r.PacketsReceived > 0 && r.ServerPacketsReceived > 0 {
printf(" server packets received: %d/%d (%.2f%%/%.2f%% loss up/down)",
r.ServerPacketsReceived, r.PacketsSent, r.UpstreamLossPercent,
r.DownstreamLossPercent)
}
if r.Duplicates > 0 {
printf(" *** DUPLICATES: %d (%.2f%%)", r.Duplicates,
r.DuplicatePercent)
}
if r.LatePackets > 0 {
printf("late (out-of-order) pkts: %d (%.2f%%)", r.LatePackets,
r.LatePacketsPercent)
}
printf(" bytes sent/received: %d/%d", r.BytesSent, r.BytesReceived)
printf(" send/receive rate: %s / %s", r.SendRate, r.ReceiveRate)
printf(" packet length: %d bytes", r.Config.Length)
printf(" timer stats: %d/%d (%.2f%%) missed, %.2f%% error",
r.TimerMisses, r.ExpectedPacketsSent, r.TimerMissPercent,
r.TimerErrPercent)
flush()
}
func writeResultJSON(r *Result, output string, cancelled bool) error {
var jout io.Writer
var gz bool
if output == "-" {
if cancelled {
return nil
}
jout = os.Stdout
} else {
gz = true
if strings.HasSuffix(output, ".json") {
gz = false
} else if !strings.HasSuffix(output, ".json.gz") {
if strings.HasSuffix(output, ".gz") {
output = output[:len(output)-3] + ".json.gz"
} else {
output = output + ".json.gz"
}
}
of, err := os.Create(output)
if err != nil {
exitOnError(err, exitCodeRuntimeError)
}
defer of.Close()
jout = of
}
if gz {
gzw := gzip.NewWriter(jout)
defer func() {
gzw.Flush()
gzw.Close()
}()
jout = gzw
}
e := json.NewEncoder(jout)
e.SetIndent("", " ")
return e.Encode(r)
}
type clientHandler struct {
quiet bool
reallyQuiet bool
}
func (c *clientHandler) OnSent(seqno Seqno, rtd *RoundTripData) {
}
func (c *clientHandler) OnReceived(seqno Seqno, rtd *RoundTripData,
prtd *RoundTripData, late bool, dup bool) {
if !c.reallyQuiet {
if dup {
printf("DUP! seq=%d", seqno)
return
}
if !c.quiet {
ipdv := "n/a"
if prtd != nil {
dv := rtd.IPDVSince(prtd)
if dv != InvalidDuration {
ipdv = rdur(AbsDuration(dv)).String()
}
}
rd := ""
rt := ""
if rtd.ReceiveDelay() != InvalidDuration {
rd = fmt.Sprintf(" rd=%s", rdur(rtd.ReceiveDelay()))
rt = fmt.Sprintf(" rt=%d", rtd.Client.Receive.Wall)
}
sd := ""
st := ""
if rtd.SendDelay() != InvalidDuration {
sd = fmt.Sprintf(" sd=%s", rdur(rtd.SendDelay()))
st = fmt.Sprintf(" st=%d", rtd.Client.Send.Wall)
}
sl := ""
if late {
sl = " (LATE)"
}
printf("seq=%d rtt=%s%s%s%s%s ipdv=%s%s", seqno, rdur(rtd.RTT()),
rd, sd, rt, st, ipdv, sl)
}
}
}
func (c *clientHandler) OnEvent(e *Event) {
if !c.reallyQuiet {
printf("%s", e)
}
}