python构造icmp echo请求和实现网络探测器功能代码分享

python发送icmp echo requesy请求

import socket
import struct

def checksum(source_string):
    sum = 0
    countto = (len(source_string)/2)*2
    count = 0
    while count<countto:
        thisval = ord(source_string[count + 1])*256 + ord(source_string[count])
        sum = sum + thisval
        sum = sum & 0xffffffff
        count = count + 2
    if countto<len(source_string):
        sum = sum + ord(source_string[len(source_string) - 1])
        sum = sum & 0xffffffff
    sum = (sum >> 16)  +  (sum & 0xffff)
    sum = sum + (sum >> 16)
    answer = ~sum
    answer = answer & 0xffff
    answer = answer >> 8 | (answer << 8 & 0xff00)
    return answer

def ping(ip):
    s = socket.socket(socket.af_inet, socket.sock_raw, 1)
    packet = struct.pack(
            "!bbhhh", 8, 0, 0, 0, 0
    )
    chksum=checksum(packet)
    packet = struct.pack(
            "!bbhhh", 8, 0, chksum, 0, 0
    )
    s.sendto(packet, (ip, 1))

if __name__=='__main__':
    ping('192.168.41.56')

扫描探测网络功能(网络探测器)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

'''
探测网络主机存活。
'''

import os
import struct
import array
import time
import socket
import ipy
import threading

class sendpingthr(threading.thread):
    '''
    发送icmp请求报文的线程。

    参数：
        ippool      -- 可迭代的ip地址池
        icmppacket  -- 构造的icmp报文
        icmpsocket  -- icmp套字接
        timeout     -- 设置发送超时
    '''
    def __init__(self, ippool, icmppacket, icmpsocket, timeout=3):
        threading.thread.__init__(self)
        self.sock = icmpsocket
        self.ippool = ippool
        self.packet = icmppacket
        self.timeout = timeout
        self.sock.settimeout( timeout + 3 )

    def run(self):
        time.sleep(0.01)  #等待接收线程启动
        for ip in self.ippool:
            try:
                self.sock.sendto(self.packet, (ip, 0))
            except socket.timeout:
                break
        time.sleep(self.timeout)

class nscan:
    '''
    参数：
        timeout    -- socket超时，默认3秒
        ipv6       -- 是否是ipv6，默认为false
    '''
    def __init__(self, timeout=3, ipv6=false):
        self.timeout = timeout
        self.ipv6 = ipv6

        self.__data = struct.pack('d', time.time())   #用于icmp报文的负荷字节（8bit）
        self.__id = os.getpid()   #构造icmp报文的id字段，无实际意义

    @property   #属性装饰器
    def __icmpsocket(self):
        '''创建icmp socket'''
        if not self.ipv6:
            sock = socket.socket(socket.af_inet, socket.sock_raw, socket.getprotobyname("icmp"))
        else:
            sock = socket.socket(socket.af_inet6, socket.sock_raw, socket.getprotobyname("ipv6-icmp"))
        return sock

    def __incksum(self, packet):
        '''icmp 报文效验和计算方法'''
        if len(packet) & 1:
            packet = packet + '\0'
        words = array.array('h', packet)
        sum = 0
        for word in words:
            sum += (word & 0xffff)
        sum = (sum >> 16) + (sum & 0xffff)
        sum = sum + (sum >> 16)

        return (~sum) & 0xffff

    @property
    def __icmppacket(self):
        '''构造 icmp 报文'''
        if not self.ipv6:
            header = struct.pack('bbhhh', 8, 0, 0, self.__id, 0) # type、code、chksum、id、seq
        else:
            header = struct.pack('bbhhh', 128, 0, 0, self.__id, 0)

        packet = header + self.__data     # packet without checksum
        chksum = self.__incksum(packet) # make checksum

        if not self.ipv6:
            header = struct.pack('bbhhh', 8, 0, chksum, self.__id, 0)
        else:
            header = struct.pack('bbhhh', 128, 0, chksum, self.__id, 0)

        return header + self.__data   # packet *with* checksum

    def isunip(self, ip):
        '''判断ip是否是一个合法的单播地址'''
        ip = [int(x) for x in ip.split('.') if x.isdigit()]
        if len(ip) == 4:
            if (0 < ip[0] < 223 and ip[0] != 127 and ip[1] < 256 and ip[2] < 256 and 0 < ip[3] < 255):
                return true
        return false

    def makeippool(self, startip, lastip):
        '''生产 ip 地址池'''
        ipver = 6 if self.ipv6 else 4
        intip = lambda ip: ipy.ip(ip).int()
        ippool = {ipy.inttoip(ip, ipver) for ip in range(intip(startip), intip(lastip)+1)}

        return {ip for ip in ippool if self.isunip(ip)}

    def mping(self, ippool):
        '''利用icmp报文探测网络主机存活

        参数：
            ippool  -- 可迭代的ip地址池
        '''
        sock = self.__icmpsocket
        sock.settimeout(self.timeout)
        packet = self.__icmppacket
        recvfroms = set()   #接收线程的来源ip地址容器

        sendthr = sendpingthr(ippool, packet, sock, self.timeout)
        sendthr.start()

        while true:
            try:
                recvfroms.add(sock.recvfrom(1024)[1][0])
            except exception:
                pass
            finally:
                if not sendthr.isalive():
                    break
        return recvfroms & ippool

if __name__=='__main__':
    s = nscan()
    ippool = s.makeippool('192.168.0.1', '192.168.0.254')
    print( s.mping(ippool) )