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main.go
183 lines (180 loc) · 4.44 KB
/
main.go
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package main
import (
"fmt"
"net"
"time"
"bytes"
"encoding/binary"
"errors"
)
const chapLen = 8
var (
errChapPasswordForm = errors.New("ChapPassword form is error!")
errNotReplyPackage = errors.New("Wrong Package!")
errPaseWrong = errors.New("Pase Error!")
errNullPointer = errors.New("NullPointer!")
)
type State struct {
alive bool
}
func (this State) Bytes()([]byte){
if this.alive{
return []byte{0x01}
}else{
return []byte{0x00}
}
}
func main() {
rAddr, err := net.ResolveUDPAddr("udp", "192.168.1.242:6007")
if err != nil {
fmt.Println(err.Error())
return
}
udpConn, err := net.DialUDP("udp", nil, rAddr)
if err != nil {
fmt.Println(err.Error())
return
}
defer udpConn.Close()
sendUDP(udpConn)
if err!=nil{
fmt.Println(err.Error())
}
receiveUDP(udpConn,rAddr)
}
func heartBeat(udpConn *net.UDPConn,rAddr *net.UDPAddr,duration time.Duration) (t time.Duration,err error){
chap:=[]byte{0x11,0x22,0x33,0x44,0xaa,0xbb,0xcc,0xdd}
sn:=uint32(1)
diTime:=time.Now()
_,err=di(udpConn,rAddr,chap,sn,getState())
if err!=nil{
return 0,err
}
rState,err:=dong(udpConn,rAddr,chap,sn,1*time.Second)
t=time.Now().Sub(diTime)
setState(rState)
return t,err
}
func getState()State{
return State{alive:true}
}
func setState(rState *State)error{
return nil
}
func di(udpConn *net.UDPConn,rAddr *net.UDPAddr,chap []byte,sn uint32,state State)(n int,err error){
sendBytesBuffer:=bytes.NewBuffer([]byte{})
binary.Write(sendBytesBuffer,binary.BigEndian,n)
len,_:=sendBytesBuffer.Write(chap)
if len!=chapLen{
return 0,errChapPasswordForm
}
len,_=sendBytesBuffer.Write(state.Bytes())
return udpConn.Write(sendBytesBuffer.Bytes())
}
func dong(udpConn *net.UDPConn,rAddr *net.UDPAddr,chap []byte,sn uint32,timeout time.Duration)(state *State,err error){
b:=make([]byte,1024)
udpConn.SetReadDeadline(time.Now().Add(timeout))
n,Addr,err:=udpConn.ReadFromUDP(b)
if err!=nil{
return nil,err
}
if (udpAddrEqual(Addr,rAddr)==false)||(checkReply(b[:n],chap,sn)) {
return nil, errNotReplyPackage
}
return getStateFromBytes(b)
}
func getStateFromBytes(b []byte)(state *State,err error){
if (b==nil){
return nil,errNullPointer
}
if (len(b)<1){
return nil,errPaseWrong
}
if b[0]==0x01{
return &State{alive:true},nil
}else if b[0]==0x02{
return &State{alive:false},nil
}
return nil,errPaseWrong
}
func checkReply(replyBuf []byte,chap []byte,sn uint32)bool{
return true
}
func sendUDP(udpConn *net.UDPConn) {
sendString:=`Hello World!/usr/local/go/bin/go build -o /Users/jiaxun/IdeaProjects/socketTest/MacPing /Users/jiaxun/IdeaProjects/socketTest/main.go /Users/jiaxun/IdeaProjects/socketTest/MacPing`
_, err := udpConn.Write([]byte(sendString))
if err != nil {
fmt.Println(err.Error())
return
}
}
func udpAddrEqual(addr1 *net.UDPAddr,addr2 *net.UDPAddr)bool{
if addr1==nil||addr2==nil{
return false
}
return addr1.IP.Equal(addr2.IP)&&(addr1.Port==addr2.Port)
}
func receiveUDP(udpConn *net.UDPConn,rAddr *net.UDPAddr) {
b := make([]byte, 1024)
udpConn.SetReadDeadline(time.Now().Add(5*time.Second))
n, Addr, err := udpConn.ReadFromUDP(b)
// n,err:=udpConn.Read(b)
if err != nil {
fmt.Println(err.Error())
return
}
if n > 1024 {
fmt.Println("Buff out!")
return
}
fmt.Println(udpConn.RemoteAddr().Network())
if !Addr.IP.Equal(rAddr.IP){
fmt.Println("IP diff:%s-%s",Addr.IP.String(),rAddr.IP.String())
return
}else if Addr.Port!=rAddr.Port{
fmt.Println("Port diff:%d-%d",Addr.Port,rAddr.Port)
return
}
fmt.Printf("Receive from %s:%s", udpConn.RemoteAddr().String(),b[:n])
}
func sendIPPacket() {
fmt.Println("go!")
ipaddr, err := net.ResolveIPAddr("ip", "192.168.1.254")
if err != nil {
fmt.Println("IP address is wrong!")
return
}
localAddrs, err := net.InterfaceAddrs()
if err != nil {
fmt.Println("Local interface is null!")
return
}
lIPAddrs := getSendLocalIP(localAddrs, ipaddr)
if lIPAddrs == nil {
fmt.Println("Local interface is null!")
return
}
fmt.Println(lIPAddrs.String())
ipConn, err := net.DialIP("ip", &net.IPAddr{IP: lIPAddrs.IP, Zone: ""}, ipaddr)
if err != nil {
fmt.Println(err.Error())
return
}
b := []byte{0xAA, 0xBB, 0xCC}
_, err = ipConn.Write(b)
if err != nil {
fmt.Println(err.Error())
return
}
defer ipConn.Close()
}
func getSendLocalIP(localAddrs []net.Addr, rIPAddr *net.IPAddr) *net.IPNet {
for _, lAddr := range localAddrs {
if lIPNet, ok := lAddr.(*net.IPNet); ok && !lIPNet.IP.IsLoopback() {
if lIPNet.Contains(rIPAddr.IP) {
return lIPNet
}
}
}
return nil
}