Re: About named port binding

From: Blazej Kantak (
Date: 01/04/02

Date: Fri, 4 Jan 2002 16:49:12 +0100 (CET)
From: Blazej Kantak <>
To: chulmin <>

On Thu, 3 Jan 2002, chulmin wrote:

> Hello, all.
> I know that only root account bind a port below 1024.
> and anyuser except root can bind or use a port above 1024.
> But named process uses udp port 53 with named uid.
> How can it be possible?
> and is it illegal or exception?

not at all. I assume that U starts named with -u option.
After named port binding, it runs seteuid function to change
process EUID. But when U send SIGHUP to named, it won't rescan active
interfaces, because it's euid is not equal 0. Process will just terminate.

                                        b. Parowka K.

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