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Date: Tue, 18 Aug 2015 13:24:16 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: getent services enumeration glitch
Message-ID: <20150818112416.GN17917@calimero.vinschen.de>
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References: <loom.20150818T113145-139@post.gmane.org>
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Hi Mark,

On Aug 18 09:40, Mark Geisert wrote:
> There is a glitch when getent enumerates all services; it shows an incorr=
ect
> port number.  Providing a service name on invocation shows the correct po=
rt
> number.  Examples:
>=20
> $ getent services man
> man                   9535/tcp
>=20
> $ getent services | grep man
> man                   16165/tcp
>=20
> It looks like when all services are enumerated there is an extra or missi=
ng
> byte swap call to htons() or ntohs().  This can be observed by comparing =
the
> hex values of the two port numbers shown above, giving 0x253F and 0x3F25.

Congratulations!  You found a 13 years old bug in Cygwin's getservent
implementation, which returned the port number in host byte order
instead of in network byte order for all this time.  Makes me wonder
how often getservent is used in the wild...

Since I uploaded 2.2.1-0.2 just before your bug report, I quickly
created a new snapshot with the patch on https://cygwin.com/snapshots/
Please give it a try.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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