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main.go
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main.go
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package main
import (
"bufio"
"dhcptest/connection"
"dhcptest/layers"
"dhcptest/utility"
"fmt"
"github.com/pinterest/bender"
"log"
"math/rand"
"net"
"os"
"strconv"
"strings"
"time"
)
var (
intervalC chan int
loggerC chan int
clientMacs []net.HardwareAddr
)
func init() {
intervalC = make(chan int)
loggerC = make(chan int)
fmt.Println("dhcptest tool Created by WRD, based on gopacket")
fmt.Println("Run with --help for a list of command-line options")
}
func main() {
//bind ip
iface, err :=utility.GetInterfaceByName(utility.BindIface, utility.ValidIface)
if err != nil {
fmt.Println(err)
return
}
//mac
for _, mac := range utility.BindMac {
clientMac, err := net.ParseMAC(mac)
if err != nil {
fmt.Println(err)
return
}
clientMacs = append(clientMacs, clientMac)
}
//option
parser := &utility.Parser{}
parser.Init()
utility.DhcpOptions, err = parser.Parse(utility.Option)
if err != nil {
fmt.Println(err)
return
}
//dhcpOptions = append(dhcpOptions, layers.NewDHCPOption(layers.DHCPOptRequestIP, requestIPByte), layers.NewDHCPOption(layers.DHCPOptClientID, clientID))
//dhcpOptions = append(dhcpOptions, layers.NewDHCPOption(layers.DHCPOptClientID, clientID))
fmt.Printf("dhcpOptions: %+v\n", utility.DhcpOptions)
/*
hostname, err := os.Hostname()
if err != nil {
fmt.Println(err)
return
}
*/
dc := &connection.DhcpClient{
//ClientMac: clientMac,
Iface: iface,
}
err = dc.Open()
if err != nil {
fmt.Println(err)
return
}
defer dc.Close()
inputReader := bufio.NewReader(os.Stdin)
fmt.Println("Type \"d\" to broadcast a DHCP discover packet, or \"help\" for details")
for {
input, err := inputReader.ReadString('\n')
if err != nil {
log.Println(err)
}
input = strings.TrimSpace(input)
params := strings.Split(input, " ")
//fmt.Printf("str: %+v", params)
if len(params) == 0 || len(params[0]) == 0 {
continue
}
command := params[0]
switch command {
case "q", "quit":
return
case "h", "help":
fmt.Println("Commands:")
fmt.Printf("\t d / discover\n" +
"\t\t Broadcasts a DHCP discover packet.\n" +
"\t\t You can optionally specify the device num and request rate\n" +
"\t\t to use for the throughput testing, e.g.\n" +
"\t\t \"d 5 100\" will pretend 5 terminals and request\n" +
"\t\t 100 times per second.\n" +
"\t\t You can also only specify the device num to use for one-time request\n" +
"\t\t dhcp packet message will be printed.The default value is 1 when the device num is omitted\n")
fmt.Printf("\t r / request\n" +
"\t\t Broadcast a DHCP discover.Then broadcast a DHCP request packet when you gen an offer packet.\n" +
"\t\t You can also specify parameters as d command does.\n")
fmt.Printf("\t s / stop used for stop the dhcp client\n")
fmt.Printf("\t h / help\n" +
"\t\t Print this message.\n")
fmt.Printf("\t q / quit\n" +
"\t\t Quits the program\n")
case "d", "discover":
err = sendDHCP(params, dc, false)
if err != nil {
log.Println(err)
}
case "r", "request":
err = sendDHCP(params, dc, true)
if err != nil {
log.Println(err)
}
case "s", "stop":
intervalC <- 1
loggerC <- 1
default:
fmt.Println("Enter a supported command, Type \"help\" for details")
}
}
}
func sendDHCP(params []string, dc *connection.DhcpClient, ifRequest bool) error {
//init deviceNum
deviceNum := 1
var err error
if len(params) >= 2 {
deviceNum, err = strconv.Atoi(params[1])
if err != nil {
return err
}
}
fmt.Printf("the %d device mac is: ", deviceNum)
var macList []net.HardwareAddr
for i:=0; i< deviceNum; i++ {
var mac net.HardwareAddr
if i < len(clientMacs) {
mac = clientMacs[i]
} else {
mac, err = net.ParseMAC(utility.RandomMac())
time.Sleep(time.Millisecond) //only ensure time seed different
if err != nil {
return err
}
}
macList = append(macList, mac)
fmt.Printf("%s ", mac)
}
fmt.Println()
//init rate
if len(params) == 3 {
rate, err := strconv.Atoi(params[2])
if err != nil {
return err
}
//send func
go func() {
/* cpu or memory test
fc, err := os.OpenFile("./cpu.prof", os.O_RDWR | os.O_CREATE, 0644)
if err != nil {
log.Fatal(err)
}
defer fc.Close()
pprof.StartCPUProfile(fc)
defer pprof.StopCPUProfile()
fm, err := os.OpenFile("./memory.prof", os.O_RDWR | os.O_CREATE, 0644)
if err != nil {
log.Fatal(err)
}
defer fm.Close()
pprof.WriteHeapProfile(fm)
*/
dc.Start(rate * 3, ifRequest, false)
defer dc.Stop()
requests := make(chan interface{}, rate * 3)
ticker := time.NewTicker(time.Second)
//countTicker测试用
//countTicker := time.NewTicker(time.Second)
//windows下的ticker精度是ms级(本次测试2ms) 所以在1s的ticker内循环rate次
go func() {
defer close(requests)
index := 0
//request := 0
for {
select {
case <-ticker.C:
for i:=0; i < rate; i++ {
mac := macList[index]
packet := connection.NewPacket(utility.DhcpOptions...)
connection.WithHWType(layers.LinkTypeEthernet)(packet)
connection.WithHwAddr(mac)(packet)
connection.WithMessageType(layers.DHCPMsgTypeDiscover)(packet)
requests <- packet
//request = request + 1
if index = index +1 ; index == deviceNum {
index = 0
}
}
case <-intervalC:
log.Println("ticker stop")
return
}
/*
select {
case <-countTicker.C:
log.Printf("produce request count : %d\n", request)
default:
}
*/
}
}()
intervals := bender.ExponentialIntervalGenerator(float64(rate))
exec := connection.CreateExecutor(dc)
bender.LoadTestThroughput(intervals, requests, exec)
}()
//低延迟读取 不要使用共享数据来通信;使用通信来共享数据
go func() {
ticker := time.NewTicker(time.Second * 5)
current_time := time.Now()
for {
select {
case <-ticker.C:
request, response := dc.GetRequestAndResponse()
now_time := time.Now()
during := now_time.Sub(current_time).Seconds()
log.Printf("request: %d, response: %d, during: %d, qSpeed: %.2f, pSpeed: %.2f", request, response, int(during), float64(request) / during, float64(response)/during)
case <-loggerC:
log.Println("logger stop")
return
}
}
}()
} else {
go func() {
dc.Start(deviceNum, ifRequest, true)
defer dc.Stop()
for i:=0; i < deviceNum; i++ {
mac := macList[i]
packet := connection.NewPacket(utility.DhcpOptions...)
connection.WithHWType(layers.LinkTypeEthernet)(packet)
connection.WithHwAddr(mac)(packet)
connection.WithMessageType(layers.DHCPMsgTypeDiscover)(packet)
dc.Send(packet, connection.WithTransactionID(rand.Uint32()))
}
select {
case <- intervalC:
<-loggerC
return
}
}()
}
return nil
}