[Patches] [ python-Patches-658327 ] Add inet_pton and inet_ntop to socket

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Patches item #658327, was opened at 2002-12-24 22:00
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Category: Core (C code)
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Jp Calderone (kuran)
>Assigned to: Neal Norwitz (nnorwitz)
Summary: Add inet_pton and inet_ntop to socket

Initial Comment:
Patch is against current CVS and adds two socket module
functions, inet_pton and inet_ntop.  Both of these
should be available on all platforms (because of other
dependancies in the code) so I don't think portability
is a problem.  inet_ntop converts a packed IP address
to a human-readable '.' or ':' separated string
representation of the IP.  inet_pton performs the
reverse operation.

(Potential) problems: inet_pton sets errno to ENOSPC,
which may lead to a confusing error message.


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>Comment By: Martin v. Löwis (loewis)
Date: 2002-12-31 14:17

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I agree that such a change should be added. Neal, you have
given this patch more attention than I did - please check it
in when you consider it complete. I just like to point out
that it is missing documentation changes (libsocket.tex), a
NEWS entry, and a test case. kuran, please provide those as
a single patch file.

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Comment By: Neal Norwitz (nnorwitz)
Date: 2002-12-31 01:11

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ISTM that in socket_inet_ntop() you need to verify the size
of the packed value passed in.  If the user passes an empty
string, inet_ntop() could read beyond the buffer passed in,
potentially causing a core dump.

The checks could be something like this:

  if (af == AF_INET && len != sizeof(struct in_addr))
  else if (af == AF_INET6 && len != sizeof(struct in6_addr))

Do this make sense?

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Comment By: Jp Calderone (kuran)
Date: 2002-12-27 16:39

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The use case I have for it at the moment is a DNS server
(Twisted.names).  inet_pton allows me to handle IPv6
addresses, so it allows me to support AAAA and A6 records. 
I believe an IPv6 capable socks proxy would find this useful
as well.  Basically, low level network stuff.


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Comment By: Martin v. Löwis (loewis)
Date: 2002-12-27 11:23

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What is the rationale for providing this functionality?

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Comment By: Jp Calderone (kuran)
Date: 2002-12-26 19:32

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Ooops, I made two, and uploaded the wrong one >:O  Sorry. 
Dunno if it's still helpful, but here's the unified diff.


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Comment By: Neal Norwitz (nnorwitz)
Date: 2002-12-26 19:10

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Next time, please use context or unified diff.  -c or -u
option to cvs diff:  cvs diff -c ...

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Comment By: Jp Calderone (kuran)
Date: 2002-12-24 22:05

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Sourceforge decided not to attach the file the first time...
 Here it is.

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