Generating and printing a range of ip addresses

[Stephen Briley]

Hi all,

I would like to write a python script that takes input
of 2 ip address, one a start address and the other the
end address and prints a list of all ip address in
between in dotted-decimal format. I've attempted to
use the ipv4 module
(http://pynms.sourceforge.net/ipv4.html) ,but I am
unable to get past this error "AttributeError : 'str'
object has no attribute '_address".

Can any suggest a solution to this problem? Is there a
better way than using the ipv4 module?

Thanks,

Steve
[color=blue][color=green][color=darkred]
>>> from ipv4 import *
>>> ip = IPv4('10.0.0.1' )
>>> startadd = ip.nexthost()
>>> endadd = ('10.0.3.0')
>>> print startadd[/color][/color][/color]
10.0.0.2[color=blue][color=green][color=darkred]
>>> print endadd[/color][/color][/color]
10.0.3.0
[color=blue][color=green][color=darkred]
>>> while startadd != endadd:[/color][/color][/color]
.... startadd = ip.nexthost()
.... print startadd
....
Traceback (most recent call last):
File "<interacti ve input>", line 1, in ?
File "C:\Python23\li b\ipv4.py", line 250, in __cmp__
return cmp(self._addre ss, other._address)
AttributeError: 'str' object has no attribute '_address'

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[Peter Otten]

Re: Generating and printing a range of ip addresses

Stephen Briley wrote:
[color=blue]
> Hi all,
>
> I would like to write a python script that takes input
> of 2 ip address, one a start address and the other the
> end address and prints a list of all ip address in
> between in dotted-decimal format. I've attempted to
> use the ipv4 module
> (http://pynms.sourceforge.net/ipv4.html) ,but I am
> unable to get past this error "AttributeError : 'str'
> object has no attribute '_address".
>
> Can any suggest a solution to this problem? Is there a
> better way than using the ipv4 module?
>
> Thanks,
>
> Steve
>[color=green][color=darkred]
>>>> from ipv4 import *
>>>> ip = IPv4('10.0.0.1' )
>>>> startadd = ip.nexthost()
>>>> endadd = ('10.0.3.0')[/color][/color][/color]

I don't known pynms, but it seems the above shoud be

endadd = IPv4('10.0.3.0' )

instead.
[color=blue][color=green][color=darkred]
>>>> print startadd[/color][/color]
> 10.0.0.2[color=green][color=darkred]
>>>> print endadd[/color][/color]
> 10.0.3.0
>[color=green][color=darkred]
>>>> while startadd != endadd:[/color][/color]
> ... startadd = ip.nexthost()
> ... print startadd
> ...
> Traceback (most recent call last):
> File "<interacti ve input>", line 1, in ?
> File "C:\Python23\li b\ipv4.py", line 250, in __cmp__
> return cmp(self._addre ss, other._address)
> AttributeError: 'str' object has no attribute '_address'[/color]

Reading the traceback carefully should give the right clue. A str object
occurs where you would expect an IPv4 instance.

Peter

[Bart Nessux]

Re: Generating and printing a range of ip addresses

Stephen Briley wrote:
[color=blue]
> Hi all,
>
> I would like to write a python script that takes input
> of 2 ip address, one a start address and the other the
> end address and prints a list of all ip address in
> between in dotted-decimal format. I've attempted to
> use the ipv4 module
> (http://pynms.sourceforge.net/ipv4.html) ,but I am
> unable to get past this error "AttributeError : 'str'
> object has no attribute '_address".
>
> Can any suggest a solution to this problem? Is there a
> better way than using the ipv4 module?[/color]

I did it like this:

def gen_and_write_i ps():
output_File = file('ips.txt', 'w')
# Generate and write our 120 IP range to a file
# Produces 128.173.120.50-80
x = 49
while x < 80:
x = x + 1
print>> output_File, "128.173.120.%d " %x

# IP Addresses that are not part of a range
# These are in the 128.173.120.0 network
lone_IP = [121, 140, 248]

# Write the lone IPs into the file
for i in lone_IP:
print>> output_File, "128.173.120.%d " %i

# Generate and write our 122 IP range to a file
# Produces 128.173.122.1-90
x = 0
while x < 90:
x = x + 1
print>> output_File, "128.173.122.%d " %x
output_File.clo se()

Your needs sound different, but it's something you could start with.

[Paul McGuire]

Re: Generating and printing a range of ip addresses

"Stephen Briley" <sdb1031@yahoo. com> wrote in message
news:mailman.26 .1076744175.313 98.python-list@python.org ...[color=blue]
> Hi all,
>
> I would like to write a python script that takes input
> of 2 ip address, one a start address and the other the
> end address and prints a list of all ip address in
> between in dotted-decimal format. I've attempted to
> use the ipv4 module
> (http://pynms.sourceforge.net/ipv4.html) ,but I am
> unable to get past this error "AttributeError : 'str'
> object has no attribute '_address".
>
> Can any suggest a solution to this problem? Is there a
> better way than using the ipv4 module?
>
> Thanks,
>
> Steve
>[/color]
Here's a generator function that works with two strings containing valid IP
addresses.
(Note: no error checking, such as verifying that endAddr > startAddr,
endAddr < 255.255.255.255 , etc.)

def ipAddrRange(sta rtAddr, endAddr):
def incrAddr(addrLi st):
addrList[3] += 1
for i in (3,2,1):
if addrList[i] == 256:
addrList[i] = 0
addrList[i-1] += 1

def asString(addrLi st):
return ".".join(map(st r,addrList))

startAddrList = map(int,startAd dr.split("."))
endAddrList = map(int,endAddr .split("."))

curAddrList = startAddrList[:]
yield asString(curAdd rList)
for i in range(4):
while curAddrList[i] < endAddrList[i]:
incrAddr(curAdd rList)
yield asString(curAdd rList)

for addr in ipAddrRange("10 .255.255.250"," 11.0.0.20"):
print addr