python实现加强版ping

#!/usr/bin/env python
# -*- coding: utf8 -*-

import socket, os,struct,select,time
import sys,IPy

ICMP_ECHO_REQUEST = 8 # Platform specific
DEFAULT_TIMEOUT = 2
DEFAULT_COUNT = 4

class Pinger(object):
    """ Pings to a host -- the Pythonic way"""

    def __init__(self, target_host, count=DEFAULT_COUNT, timeout=DEFAULT_TIMEOUT):
        self.target_host = target_host
        self.count = count
        self.timeout = timeout


    def do_checksum(self, source_string):
        """  Verify the packet integritity """
        sum = 0
        max_count = (len(source_string)/2)*2
        count = 0
        while count < max_count:

            val = source_string[count + 1]*256 + source_string[count]
            sum = sum + val
            sum = sum & 0xffffffff
            count = count + 2

        if max_count<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 receive_pong(self, sock, ID, timeout):
        """
        Receive ping from the socket.
        """
        time_remaining = timeout
        while True:
            start_time = time.time()
            readable = select.select([sock], [], [], time_remaining)
            time_spent = (time.time() - start_time)
            if readable[0] == []: # Timeout
                return

            time_received = time.time()
            recv_packet, addr = sock.recvfrom(1024)
            icmp_header = recv_packet[20:28]
            type, code, checksum, packet_ID, sequence = struct.unpack(
       "bbHHh", icmp_header
   )
            if packet_ID == ID:
                bytes_In_double = struct.calcsize("d")
                time_sent = struct.unpack("d", recv_packet[28:28 + bytes_In_double])[0]
                return time_received - time_sent

            time_remaining = time_remaining - time_spent
            if time_remaining <= 0:
                return


    def send_ping(self, sock,  ID):
        """
        Send ping to the target host
        """
        target_addr  =  socket.gethostbyname(self.target_host)

        my_checksum = 0

        # Create a dummy heder with a 0 checksum.
        header = struct.pack("bbHHh", ICMP_ECHO_REQUEST, 0, my_checksum, ID, 1)
        bytes_In_double = struct.calcsize("d")
        data = (192 - bytes_In_double) * "Q"
        data = struct.pack("d", time.time()) + bytes(data.encode('utf-8'))

        # Get the checksum on the data and the dummy header.
        my_checksum = self.do_checksum(header + data)
        header = struct.pack(
      "bbHHh", ICMP_ECHO_REQUEST, 0, socket.htons(my_checksum), ID, 1
  )
        packet = header + data
        sock.sendto(packet, (target_addr, 1))


    def ping_once(self):
        """
        Returns the delay (in seconds) or none on timeout.
        """
        icmp = socket.getprotobyname("icmp")
        try:
            sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, icmp)
        except socket.error as e:
            if e.errno == 1:
                # Not superuser, so operation not permitted
                e.msg +=  "ICMP messages can only be sent from root user processes"
                raise socket.error(e.msg)
        except Exception as e:
            print ("Exception: %s" %(e))

        my_ID = os.getpid() & 0xFFFF

        self.send_ping(sock, my_ID)
        delay = self.receive_pong(sock, my_ID, self.timeout)
        sock.close()
        return delay



    def ping(self):
        """
        Run the ping process
        """
        for i in range(self.count):
            try:
                delay  =  self.ping_once()
            except socket.gaierror as e:
                print ("Ping failed. (socket error: '%s')" % e[1])
                break

            if delay  ==  None:
                print ("Ping failed. (timeout within %ssec.)" % self.timeout)
            else:
                delay  =  delay * 1000
                print ("Get pong in %0.4fms" % delay)


if __name__ == '__main__':

    def check_ip(ip):
        # try:
        #     IPy.IP(ip)
        #     return True
        # except:
        #     return False

        sep = ip.split('.')
        if len(sep) != 4:
            return False
        for i, x in enumerate(sep):
            try:
                int_x = int(x)
                if int_x < 0 or int_x > 255:
                    return False
            except Exception as e:
                return False
        return True

    def is_port(port):
        try:
            if 0<int(port)<=65535:
                return True
            else:
                return False
        except:
            return False


    def check_port(ip, port):
        if check_ip(ip) == False:
            print("Input ip is not valid.")
            sys.exit()
        if is_port(port)==False and port!='all':
            print("Port is not valid.")
            sys.exit()
        '''socket检测端口连通性'''
        if not port:
            return True
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(3)
        try:
            s.connect((ip, int(port)))
            s.shutdown(socket.SHUT_RDWR)
            print("Connect successfully!")
            return True
        except:
            print("Connect failed!")
            return False

    def check_vip(target_host):
        if check_ip(target_host) == False:
            print("Input ip is not valid.")
            sys.exit()
        '''检测vip是否可以ping通'''
        pinger = Pinger(target_host=target_host)
        try:
            delay = pinger.ping_once()
            status = True
            if delay == None:
                status = False
        except socket.gaierror as e:
            status = False
        if status == True:
            print("Ping successfully!")
        else:
            print("Ping failed!")
        return status

    if len(sys.argv) == 2:
        check_vip(str(sys.argv[1]))
    #
    # elif sys.argv[2] == 'all':
    #     for port in range(21,20000):


    elif len(sys.argv) == 3:
        check_port(str(sys.argv[1]),sys.argv[2])

    else:
        print("Usage:pingtest [ip|ip port]")