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Re: [PATCH]:bindresvport should check /etc/services
- From: Thorsten Kukuk <kukuk at suse dot de>
- To: Rajasekhar Inguva <irajasek at in dot ibm dot com>,libc-alpha at sources dot redhat dot com
- Date: Sun, 1 Dec 2002 13:04:02 +0100
- Subject: Re: [PATCH]:bindresvport should check /etc/services
- Organization: SuSE Linux AG, Nuernberg, Germany
- References: <OFA82AF8B8.E909DEF3-ON65256C7D.001EF2F7@in.ibm.com>
On Tue, Nov 26, Rajasekhar Inguva wrote:
> Hi All,
>
> The glibc routine bindresvport(), in it's current implementation, randomly
> tries to a bind to a port number in the range 600-1023. It does not check
> if the selected port number has an entry in /etc/services. Due to this a
> server using bindresvport() might grab a port which belongs to a well
> known
> service as described in /etc/services. And should the well known service
> start later it would fail to bind to it's port.
>
> The patch below would take care of this situation by making bindresvport()
> ignore all ports which have an entry in /etc/services. This is achieved by
> calling getservbyport() which returns NULL if a specified port number does
> not have an entry in /etc/services.
With this patch applied, no port will be found, if somebody uses
the /etc/services file from IANA. All ports below 1023 are official
registered. There is no port reserved for RPC, so you have to find
another solution.
Thorsten
--
Thorsten Kukuk http://www.suse.de/~kukuk/ kukuk@suse.de
SuSE Linux AG Deutschherrnstr. 15-19 D-90429 Nuernberg
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