inet_aton and struct issue

[David Bear]

I found this simple recipe for converting a dotted quad ip address to a
string of a long int.

struct.unpack('L',socket.inet_aton(ip))[0]

trouble is when I use this, I get

struct.error: unpack str size does not match format

I thought ip addresses were unsigned 32 bit integers.

Is there a better way to take a dotted quad and convert it to a string
representation of an long int?

 

[Diez B. Roggisch]

I found this simple recipe for converting a dotted quad ip address to a
string of a long int.

struct.unpack('L',socket.inet_aton(ip))[0]

trouble is when I use this, I get

struct.error: unpack str size does not match format

I thought ip addresses were unsigned 32 bit integers.

Is there a better way to take a dotted quad and convert it to a string
representation of an long int?

Works for me:

>>> import socket
>>> import struct
>>> ip = "127.0.0.1"
>>> struct.unpack('L',socket.inet_aton(ip))[0]

2130706433L


Diez

 

[David Bear]

I found this simple recipe for converting a dotted quad ip address to a
string of a long int.

struct.unpack('L',socket.inet_aton(ip))[0]

trouble is when I use this, I get

struct.error: unpack str size does not match format

I thought ip addresses were unsigned 32 bit integers.

Is there a better way to take a dotted quad and convert it to a string
representation of an long int?

Works for me:

import socket
import struct
ip = "127.0.0.1"
struct.unpack('L',socket.inet_aton(ip))[0]

2130706433L

I really wish it worked for me:
Traceback (most recent call last):
File "<stdin>", line 1, in ?
struct.error: unpack str size does not match format

This is python packaged with Suse 9.3.

dir(struct) ['__doc__', '__file__', '__name__', 'calcsize', 'error', 'pack', 'unpack']
print struct.__file__

/usr/lib64/python2.4/lib-dynload/struct.so

could I have a broken python?

 

[David Bear]

I found this simple recipe for converting a dotted quad ip address to a
string of a long int.

struct.unpack('L',socket.inet_aton(ip))[0]

trouble is when I use this, I get

struct.error: unpack str size does not match format

I thought ip addresses were unsigned 32 bit integers.

Is there a better way to take a dotted quad and convert it to a string
representation of an long int?

Works for me:

import socket
import struct
ip = "127.0.0.1"
struct.unpack('L',socket.inet_aton(ip))[0]

2130706433L

I really wish it worked for me:
Traceback (most recent call last):
File "<stdin>", line 1, in ?
struct.error: unpack str size does not match format

This is python packaged with Suse 9.3.

dir(struct) ['__doc__', '__file__', '__name__', 'calcsize', 'error', 'pack', 'unpack']
print struct.__file__

/usr/lib64/python2.4/lib-dynload/struct.so

could I have a broken python?

Diez

I played around with format size and here are some results. (they don't make
sense)
Traceback (most recent call last):
Traceback (most recent call last):
Traceback (most recent call last):

So, ip1s really should be a long unsigned int.. but it doesn't decode as
that. Is this the way to interpret this?