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[bug-inetutils] bug: inetd does not map IPv6 to IPv4

From: Ferruccio Fantozzi
Subject: [bug-inetutils] bug: inetd does not map IPv6 to IPv4
Date: Thu, 4 Jan 2018 12:36:36 +0100

Hi all,

I think I found a problem in the way inetd maps IPv4/IPv6 connections.

When protocol in inetd.conf is set as
'tcp': inetd accepts IPv4 connections only
'tcp4': same as above
'tcp6only': inetd accepts IPv6 connections only
'tcp6': same as above.

The problem is with the latter 'tcp6': I think
inetd should accept both IPv6 and IPv4 in this case.

In inetd.c function getconfigent() line 1119, we have

      if (sep->se_proto[3] == '6')
          sep->se_family = AF_INET6;
          sep->se_v4mapped = 0;
          /* Check for tcp6only and udp6only.  */
          if (strcmp (&sep->se_proto[3], "6only") == 0)
            sep->se_v4mapped = 0;

se_v4mapped is set to 0 for both 'tcp6' and 'tcp6only'.
I do not think this is what was intended?
Or is there another way to set se_v4mapped=1 when se_family=AF_INET6?

Proposed patch attached... There is no need to set se_v4mapped=1 here,
because it is the default (line 1114).


Ferruccio Fantozzi

Attachment: 0004-fix-ipv6-mapped-to-ipv4.patch
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