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111 lines
2.0 KiB
Go
111 lines
2.0 KiB
Go
package starnet
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import (
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"bytes"
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"encoding/binary"
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"net"
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"time"
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)
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type ICMP struct {
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Type uint8
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Code uint8
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CheckSum uint16
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Identifier uint16
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SequenceNum uint16
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}
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func getICMP(seq uint16) ICMP {
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icmp := ICMP{
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Type: 8,
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Code: 0,
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CheckSum: 0,
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Identifier: 0,
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SequenceNum: seq,
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}
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var buffer bytes.Buffer
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binary.Write(&buffer, binary.BigEndian, icmp)
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icmp.CheckSum = checkSum(buffer.Bytes())
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buffer.Reset()
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return icmp
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}
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func sendICMPRequest(icmp ICMP, destAddr *net.IPAddr, timeout time.Duration) (PingResult, error) {
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var res PingResult
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res.RemoteIP = destAddr.String()
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conn, err := net.DialIP("ip:icmp", nil, destAddr)
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if err != nil {
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return res, err
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}
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defer conn.Close()
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var buffer bytes.Buffer
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binary.Write(&buffer, binary.BigEndian, icmp)
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if _, err := conn.Write(buffer.Bytes()); err != nil {
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return res, err
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}
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tStart := time.Now()
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conn.SetReadDeadline((time.Now().Add(timeout)))
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recv := make([]byte, 1024)
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res.RecvCount, err = conn.Read(recv)
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if err != nil {
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return res, err
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}
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tEnd := time.Now()
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res.Duration = tEnd.Sub(tStart)
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return res, err
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}
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func checkSum(data []byte) uint16 {
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var (
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sum uint32
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length int = len(data)
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index int
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)
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for length > 1 {
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sum += uint32(data[index])<<8 + uint32(data[index+1])
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index += 2
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length -= 2
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}
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if length > 0 {
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sum += uint32(data[index])
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}
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sum += (sum >> 16)
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return uint16(^sum)
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}
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type PingResult struct {
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Duration time.Duration
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RecvCount int
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RemoteIP string
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}
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func Ping(ip string, seq int, timeout time.Duration) (PingResult, error) {
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var res PingResult
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ipAddr, err := net.ResolveIPAddr("ip", ip)
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if err != nil {
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return res, err
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}
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icmp := getICMP(uint16(seq))
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return sendICMPRequest(icmp, ipAddr, timeout)
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}
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func IsIpPingable(ip string, timeout time.Duration, retryLimit int) bool {
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for i := 0; i < retryLimit; i++ {
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_, err := Ping(ip, 29, timeout)
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if err != nil {
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continue
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}
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return true
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}
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return false
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}
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