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Subject: Re: java-server-socket-binding-multiple-domain-host-names
From: Elgs Chen <elgs1980@hotmail.com>
In-Reply-To: <51A10661.7080407@gmail.com>
Date: Sun, 26 May 2013 02:52:08 +0800
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To: "Tomcat Developers List" <dev@tomcat.apache.org>

Yes, .getLocalAddress().getHostName() is not reliable. I don't assume =
the connection to be an HTTP connection. Probably I will set a new flag =
like allowPeep: true to request peeping into the header information if =
the users know that they are using HTTP for this connection. However, =
I'm afraid it's not possible to peep if the users are using HTTPS.

Thanks for the info, Enrico.
Elgs

On May 26, 2013, at 2:43 AM, Enrico Olivelli <eolivelli@gmail.com> =
wrote:

> If you are using HTTP then clients will politely tell you which DNS =
name they are tryning to connect to using the "host:" header.
> TCP does not give any info about "hostnames", but only about "IP =
Addresses"
> I think .getLocalAddress().getHostName() will simply try to resolve =
back the IP address to  a DNS name
>=20
> I hope that helps
> Enrico
>=20
> Il 25/05/2013 18:23, Elgs Chen ha scritto:
>> Hi Mark,
>>=20
>> I'm very sorry I know this is not related to the Tomcat project. =
However, I cannot find anyone who I think has more expertise in java =
networking programming than you.
>>=20
>> I have a java server socket problem and I have no way to find the =
answer. I'm really hoping I can get some insights from you. Thanks in =
advance.
>>=20
>> And here's the URL to this question:
>> =
http://stackoverflow.com/questions/16751062/java-server-socket-binding-mul=
tiple-domain-host-names
>>=20
>> I have a java nio server with ip address 192.168.0.1 listening on =
port 80. I configured this server to bind to multiple domain/host names, =
let's say server1, server2, server3 are all resolved as 192.168.0.1.
>>=20
>> Now I'm hoping if the client connects to server1, on the server side, =
I can recognize that the client is connecting to server1 instead of =
other names or direct ip address, so that I can do something special, =
and if the client is connecting to server2, I can recognize that the =
client is requesting server2, so I can do something else special, and so =
on.
>>=20
>> Now the question is: seems on the server side, I cannot easily get =
the correct information which server name my clients are connecting to.
>>=20
>> I have the follow code:
>>=20
>> ServerSocketChannel ssChannel =3D (ServerSocketChannel) =
selKey.channel();
>> String boundHost =3D =
sChannel.socket().getLocalAddress().getHostName();
>> But it does not work, the boundHost is always the server1 even if =
clients connect to server2 or server3.
>>=20
>> Thanks,
>> Elgs
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>>=20
>=20
>=20
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: dev-unsubscribe@tomcat.apache.org
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>=20
>=20


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