/
ping.go
81 lines (71 loc) · 2.03 KB
/
ping.go
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/*
* lmap (LinuxHub's Nmap) is the nmap next generation pro plus max.
* Copyright (C) <2021> <LinuxHub-Group>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package lmap
import (
"bytes"
"encoding/binary"
"log"
"net"
"time"
)
func Ping(ip net.IP) bool {
var icmp ICMP
//开始填充数据包
icmp.Type = 8 //8->echo message 0->reply message
recvBuf := make([]byte, 32)
var buffer bytes.Buffer
//先在buffer中写入icmp数据报求去校验和
_ = binary.Write(&buffer, binary.BigEndian, icmp)
icmp.Checksum = checkSum(buffer.Bytes())
//然后清空buffer并把求完校验和的icmp数据报写入其中准备发送
buffer.Reset()
_ = binary.Write(&buffer, binary.BigEndian, icmp)
conn, err := net.DialTimeout("ip4:icmp", ip.String(), 1*time.Second)
if err != nil {
return false
}
_, err = conn.Write(buffer.Bytes())
if err != nil {
log.Println("conn.Write error:", err)
return false
}
_ = conn.SetReadDeadline(time.Now().Add(time.Second * 2))
num, err := conn.Read(recvBuf)
if err != nil {
return false
}
_ = conn.SetReadDeadline(time.Time{})
return string(recvBuf[0:num]) != ""
}
func checkSum(data []byte) uint16 {
var (
sum uint32
length = len(data)
index int
)
for length > 1 {
sum += uint32(data[index])<<8 + uint32(data[index+1])
index += 2
length -= 2
}
if length > 0 {
sum += uint32(data[index])
}
sum += sum >> 16
return uint16(^sum)
}