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DHCP query script not work.

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  DHCP query script not work. 不坏阿峰 <onlydebian@gmail.com> - 2014-06-19 05:56 -0700
    Re: DHCP query script not work. Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-19 13:14 +0000
    Re: DHCP query script not work. Peter Otten <__peter__@web.de> - 2014-06-19 15:23 +0200
      Re: DHCP query script not work. soneedu@gmail.com - 2014-06-19 06:30 -0700
      Re: DHCP query script not work. 不坏阿峰 <onlydebian@gmail.com> - 2014-06-19 06:32 -0700
    Re: DHCP query script not work. Anssi Saari <as@sci.fi> - 2014-06-19 16:49 +0300
      Re: DHCP query script not work. 不坏阿峰 <onlydebian@gmail.com> - 2014-06-19 06:56 -0700
        Re: DHCP query script not work. 不坏阿峰 <onlydebian@gmail.com> - 2014-06-25 03:53 -0700

#73419 — DHCP query script not work.

Dear all

i got code recipes from here. and i want to run it on win 7. 
http://code.activestate.com/recipes/577649-dhcp-query/

i have do some modify and use print to check how it is work, but i am stucked now. 

hope someone can help me. thanks a lot.

i meet this error:

Traceback (most recent call last):
  File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 138, in <module>
    offer = DHCPOffer(data, discoverPacket.transactionID)
  File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 82, in __init__
    self.unpack()
  File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 95, in unpack
    dnsNB = int(data[268] / 4)
TypeError: unsupported operand type(s) for /: 'str' and 'int'

########################################
__author__ = 'Administrator'

'''
Created on Mar 27, 2011

@author: hassane
'''
import socket
import struct
from uuid import getnode as get_mac
from random import randint


def getMacInBytes():
    print get_mac()
    mac = str(hex(get_mac()))
    print mac
    mac = mac[2:]
    mac = mac[:-1]  # i edited
    print mac, len(mac)
    while len(mac) < 12:
        mac = '0' + mac
        print mac
    macb = b''
    for i in range(0, 12, 2):
        print mac[i:i + 2]
        m = int(mac[i:i + 2], 16)
        #print m
        macb += struct.pack('!B', m)
        print repr(macb), struct.calcsize('!B'),"++"
    print macb,"=="
    return macb


class DHCPDiscover:
    def __init__(self):
        self.transactionID = b''
        for i in range(4):
            t = randint(0, 255)
            self.transactionID += struct.pack('!B', t)
            print self.transactionID, "=="
    def buildPacket(self):
        macb = getMacInBytes()
        print repr(macb)
        packet = b''
        packet += b'\x01'  # Message type: Boot Request (1)
        packet += b'\x01'  # Hardware type: Ethernet
        packet += b'\x06'  # Hardware address length: 6
        packet += b'\x00'  # Hops: 0
        packet += self.transactionID  # Transaction ID
        packet += b'\x00\x00'  # Seconds elapsed: 0
        packet += b'\x80\x00'  # Bootp flags: 0x8000 (Broadcast) + reserved flags
        packet += b'\x00\x00\x00\x00'  # Client IP address: 0.0.0.0
        packet += b'\x00\x00\x00\x00'  # Your (client) IP address: 0.0.0.0
        packet += b'\x00\x00\x00\x00'  # Next server IP address: 0.0.0.0
        packet += b'\x00\x00\x00\x00'  # Relay agent IP address: 0.0.0.0
        # packet += b'\x00\x26\x9e\x04\x1e\x9b'   #Client MAC address: 00:26:9e:04:1e:9b
        packet += macb
        packet += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'  #Client hardware address padding: 00000000000000000000
        packet += b'\x00' * 67  #Server host name not given
        packet += b'\x00' * 125  #Boot file name not given
        packet += b'\x63\x82\x53\x63'  #Magic cookie: DHCP
        packet += b'\x35\x01\x01'  #Option: (t=53,l=1) DHCP Message Type = DHCP Discover
        #packet += b'\x3d\x06\x00\x26\x9e\x04\x1e\x9b'   #Option: (t=61,l=6) Client identifier
        packet += b'\x3d\x06' + macb
        packet += b'\x37\x03\x03\x01\x06'  #Option: (t=55,l=3) Parameter Request List
        packet += b'\xff'  #End Option
        return packet

class DHCPOffer:
    def __init__(self, data, transID):
        self.data = data
        self.transID = transID
        self.offerIP = ''
        self.nextServerIP = ''
        self.DHCPServerIdentifier = ''
        self.leaseTime = ''
        self.router = ''
        self.subnetMask = ''
        self.DNS = []
        self.unpack()

    def unpack(self):
        if self.data[4:8] == self.transID:
            self.offerIP = '.'.join(map(lambda x: str(x), data[16:20]))
            self.nextServerIP = '.'.join(map(lambda x: str(x), data[20:24]))  # c'est une option
            self.DHCPServerIdentifier = '.'.join(map(lambda x: str(x), data[245:249]))
            self.leaseTime = str(struct.unpack('!L', data[251:255])[0])
            self.router = '.'.join(map(lambda x: str(x), data[257:261]))
            self.subnetMask = '.'.join(map(lambda x: str(x), data[263:267]))
            #print self.router, self.subnetMask, self.leaseTime, self.DHCPServerIdentifier, repr(self.offerIP)
            print repr(data)
            print repr(data[268])
            dnsNB = int(data[268] / 4)
            for i in range(0, 4 * dnsNB, 4):
                self.DNS.append('.'.join(map(lambda x: str(x), data[269 + i:269 + i + 4])))

    def printOffer(self):
        key = ['DHCP Server', 'Offered IP address', 'subnet mask', 'lease time (s)', 'default gateway']
        val = [self.DHCPServerIdentifier, self.offerIP, self.subnetMask, self.leaseTime, self.router]
        for i in range(4):
            print('{0:20s} : {1:15s}'.format(key[i], val[i]))

        print('{0:20s}'.format('DNS Servers') + ' : ', ) #end=''   here also have error.
        if self.DNS:
            print('{0:15s}'.format(self.DNS[0]))
        if len(self.DNS) > 1:
            for i in range(1, len(self.DNS)):
                print('{0:22s} {1:15s}'.format(' ', self.DNS[i]))


if __name__ == '__main__':
    # defining the socket
    dhcps = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  #internet, UDP
    dhcps.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)  #broadcast

    try:
        dhcps.bind(('', 68))  #we want to send from port 68
    except Exception as e:
        print('port 68 in use...')
        dhcps.close()
        input('press any key to quit...')
        exit()

    #buiding and sending the DHCPDiscover packet
    discoverPacket = DHCPDiscover()
    dhcps.sendto(discoverPacket.buildPacket(), ('<broadcast>', 67))

    print('DHCP Discover sent waiting for reply...\n')

    #receiving DHCPOffer packet
    dhcps.settimeout(3)
    try:
        while True:
            data = dhcps.recv(1024)
            print "here",repr(discoverPacket.transactionID), ">>>", len(data)
            offer = DHCPOffer(data, discoverPacket.transactionID)
            if offer.offerIP:
                offer.printOffer()
                break
    except socket.timeout as e:
        print(e)

    dhcps.close()  #we close the socket

    input('press any key to quit...')
    exit()

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#73421

On Thu, 19 Jun 2014 05:56:57 -0700, 不坏阿峰 wrote:


> Traceback (most recent call last):
>   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 138, in <module>
>     offer = DHCPOffer(data, discoverPacket.transactionID)
>   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 82, in __init__
>     self.unpack()
>   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 95, in unpack
>     dnsNB = int(data[268] / 4)
> TypeError: unsupported operand type(s) for /: 'str' and 'int'


data[268] returns a string. You cannot divide a string by an int.

Perhaps you need to change the line to this?

dnsNB = int(data[268]) / 4



-- 
Steven D'Aprano

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#73424

不坏阿峰 wrote:

> i got code recipes from here. and i want to run it on win 7.
> http://code.activestate.com/recipes/577649-dhcp-query/
> 
> i have do some modify and use print to check how it is work, but i am
> stucked now.
> 
> hope someone can help me. thanks a lot.
> 
> i meet this error:
> 
> Traceback (most recent call last):
>   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 138, in <module>
>     offer = DHCPOffer(data, discoverPacket.transactionID)
>   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 82, in __init__
>     self.unpack()
>   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 95, in unpack
>     dnsNB = int(data[268] / 4)
> TypeError: unsupported operand type(s) for /: 'str' and 'int'

The script is written for Python 3, and you seem to be using a Python 2 
interpreter. While

dnsNB = int(data[268]/4)

would become

dnsNB = ord(data[268])/4

in Python 2 that's probably not the only change that needs to be made. For 
someone not familiar with Python the easiest fix is to install Python 3.4 
(you don't need to unistall Python 2) and to run the script as is.

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#73426

On Thursday, June 19, 2014 8:23:17 PM UTC+7, Peter Otten wrote:
> 不坏阿峰 wrote:
> 
> 
> 
> > i got code recipes from here. and i want to run it on win 7.
> 
> > http://code.activestate.com/recipes/577649-dhcp-query/
> 
> > 
> 
> > i have do some modify and use print to check how it is work, but i am
> 
> > stucked now.
> 
> > 
> 
> > hope someone can help me. thanks a lot.
> 
> > 
> 
> > i meet this error:
> 
> > 
> 
> > Traceback (most recent call last):
> 
> >   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 138, in <module>
> 
> >     offer = DHCPOffer(data, discoverPacket.transactionID)
> 
> >   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 82, in __init__
> 
> >     self.unpack()
> 
> >   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 95, in unpack
> 
> >     dnsNB = int(data[268] / 4)
> 
> > TypeError: unsupported operand type(s) for /: 'str' and 'int'
> 
> 
> 
> The script is written for Python 3, and you seem to be using a Python 2 
> 
> interpreter. While
> 
> 
> 
> dnsNB = int(data[268]/4)
> 
> 
> 
> would become
> 
> 
> 
> dnsNB = ord(data[268])/4
> 
> 
> 
> in Python 2 that's probably not the only change that needs to be made. For 
> 
> someone not familiar with Python the easiest fix is to install Python 3.4 
> 
> (you don't need to unistall Python 2) and to run the script as is.

yes, i use Python 2.7. i am a beginner learn network program part.  i can not modify it myself now, i have trid some days.  hope some expert can help me correct this code in Python 2.7.

many thanks in advanced.

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#73427

在 2014年6月19日星期四UTC+7下午8时23分17秒，Peter Otten写道：
> 不坏阿峰 wrote:
> 
> 
> 
> > i got code recipes from here. and i want to run it on win 7.
> 
> > http://code.activestate.com/recipes/577649-dhcp-query/
> 
> > 
> 
> > i have do some modify and use print to check how it is work, but i am
> 
> > stucked now.
> 
> > 
> 
> > hope someone can help me. thanks a lot.
> 
> > 
> 
> > i meet this error:
> 
> > 
> 
> > Traceback (most recent call last):
> 
> >   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 138, in <module>
> 
> >     offer = DHCPOffer(data, discoverPacket.transactionID)
> 
> >   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 82, in __init__
> 
> >     self.unpack()
> 
> >   File "D:/Workspace/TestExcel/Test/test_DHCP.py", line 95, in unpack
> 
> >     dnsNB = int(data[268] / 4)
> 
> > TypeError: unsupported operand type(s) for /: 'str' and 'int'
> 
> 
> 
> The script is written for Python 3, and you seem to be using a Python 2 
> 
> interpreter. While
> 
> 
> 
> dnsNB = int(data[268]/4)
> 
> 
> 
> would become
> 
> 
> 
> dnsNB = ord(data[268])/4
> 
> 
> 
> in Python 2 that's probably not the only change that needs to be made. For 
> 
> someone not familiar with Python the easiest fix is to install Python 3.4 
> 
> (you don't need to unistall Python 2) and to run the script as is.

yes, i use Python 2.7. i am a beginner learn network program part.  i can not modify it myself now, i have trid some days.  hope some expert can help me correct this code in Python 2.7. 

many thanks in advanced.

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#73429

不坏阿峰 <onlydebian@gmail.com> writes:

> Dear all
>
> i got code recipes from here. and i want to run it on win 7. 
> http://code.activestate.com/recipes/577649-dhcp-query/

It works for me as is in Windows 7. It's a Python 3 script though which
might be your problem.

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#73430

On Thursday, June 19, 2014 8:49:21 PM UTC+7, Anssi Saari wrote:
> 不坏阿峰 <onlydebian@gmail.com> writes:
> 
> 
> 
> > Dear all
> 
> >
> 
> > i got code recipes from here. and i want to run it on win 7. 
> 
> > http://code.activestate.com/recipes/577649-dhcp-query/
> 
> 
> 
> It works for me as is in Windows 7. It's a Python 3 script though which
> 
> might be your problem.


i got that my issue is the Python version , my is 2.7. i am not familiar with 3.and my tools coded by 2.7.   

i am stucked on this script.  tks for ur reply.  hope have someone change this script work on 2.7

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#73569

anyone can help ?

在 2014年6月19日星期四UTC+7下午8时56分06秒，不坏阿峰写道：
> On Thursday, June 19, 2014 8:49:21 PM UTC+7, Anssi Saari wrote:
> 
> > 不坏阿峰 <onlydebian@gmail.com> writes:
> 
> > 
> 
> > 
> 
> > 
> 
> > > Dear all
> 
> > 
> 
> > >
> 
> > 
> 
> > > i got code recipes from here. and i want to run it on win 7. 
> 
> > 
> 
> > > http://code.activestate.com/recipes/577649-dhcp-query/
> 
> > 
> 
> > 
> 
> > 
> 
> > It works for me as is in Windows 7. It's a Python 3 script though which
> 
> > 
> 
> > might be your problem.
> 
> 
> 
> 
> 
> i got that my issue is the Python version , my is 2.7. i am not familiar with 3.and my tools coded by 2.7.   
> 
> 
> 
> i am stucked on this script.  tks for ur reply.  hope have someone change this script work on 2.7

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