[Patches] [ python-Patches-574707 ] makesockaddr, use addrlen with AF_UNIX

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Patches item #574707, was opened at 2002-06-27 20:21
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Category: Modules
Group: Python 2.1.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Donn Cave (donnc)
Assigned to: Nobody/Anonymous (nobody)
Summary: makesockaddr, use addrlen with AF_UNIX

Initial Comment:
makesockaddr(), in 2.1 source, expects a NUL terminated string 
in sockaddr_un.sun_path.  That expectation is routinely not 
met on some platforms - NetBSD 1.5.2, AIX 4.3.3, probably 
others.  This patch shows how to use addrlen to determine the 
correct length of the value of sun_path.

Here's the diff (I have no idea what it means to "attach"
a file from my web browser), against 2.1 source.

*** socketmodule.c.dist Sun Apr 15 17:21:33 2001
--- socketmodule.c      Thu Jun 27 11:09:57 2002
***************
*** 597,603 ****
        case AF_UNIX:
        {
                struct sockaddr_un *a = (struct sockaddr_un *) 
addr;
!               return PyString_FromString(a->sun_path);
        }
  #endif

--- 597,605 ----
        case AF_UNIX:
        {
                struct sockaddr_un *a = (struct sockaddr_un *) 
addr;
!               return PyString_FromStringAndSize(a->sun_path,
!                       addrlen -
!                       (sizeof(struct sockaddr_un) - sizeof(a
->sun_path)));
        }
  #endif

----------------------------------------------------------------------

>Comment By: Martin v. Löwis (loewis)
Date: 2002-07-28 18:25

Message:
Logged In: YES 
user_id=21627

This patch does not work. On systems where a NUL is
returned, this NUL is also accounted-for in addrlen, and
hence included in the string.

Would you like to revise your patch to support both cases?
Feel free to use the offsetof macro, btw.

Attaching a file is done by checking "Check to Upload and
Attach a File:" and adding a file name in the field below.

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