"server-tcpip-sockets" and ports

[aotto1968]

Hi,

question about "server-tcpip-sockets" and ports

1. I wrote a small programm to isolate the problem
2. I send the source-code to you
3. the problem is that on Interix !!more!! than on
server-process can listen on the !!same!! port
4. first the output of the test-tool as introduction

LINUX
-----

dev1usr@linux02:> ./socket.run localhost 5001
M> MSG start server on host=localhost with port=5001
M> MSG start 1. server
M> MSG start 2. server
M> ERR main: Address already in use

INTERIX
-------

noadmin@win01:> ./socket.run localhost 5001
M> MSG start server on host=localhost with port=5001
M> MSG start 1. server
M> MSG start 2. server
M> MSG netstat -a | grep 5001
TCP win01:5001 win01:0 ABHREN
TCP win01:5001 win01:0 ABHREN

5. Linux: the starting of the second listener fails with
"Address already in use"
Interix: everything seems to be ok

6. question: why does this happen?


mfg

aotto

[markfunk]

how many network connections (ie network drivers, ...) do you have installed on your Windows box ?

How did you do the bind() on the socket before the listen() ?
What parameters did you use ?

[aotto1968]

Hi,

if you ave an email-adress I can send the test-tool to you


mfg

aotto

[aotto1968]

Hi,

the code as email
(save as email and open it)

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
From aotto@t-online.de Thu Apr 22 16:49:22 2004
From: Andreas Otto NOSPAM
Organization: IPN
To: tools@interopsystems.com
Subject: "server-tcpip-sockets" and ports
Date: Thu, 22 Apr 2004 16:49:22 0200
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Hi,

the test-tool for you


mfg

aotto

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[aotto1968]

Hi,

this is an additional "socket" problem
every!! user kann open a listen-socket on low-ports
use the "socket-test-tool", post befor, to test

LINUX:

dev1usr@linux02:> ./socket.run localhost 24
M> MSG start server on host=localhost with port=24
M> MSG start 1. server
M> ERR main: Permission denied

INTERIX:

noadmin@win01:> ./socket.run localhost 24
M> MSG start server on host=localhost with port=24
M> MSG start 1. server
M> MSG start 2. server
M> MSG netstat -a | grep 24
TCP win01:24 win01:0 ABHREN
TCP win01:24 win01:0 ABHREN


mfg

aotto

[markfunk]

every!! user kann open a listen-socket on low-ports

Correct. WinSock does not restrict access to ports.

[markfunk]

the code as email
(save as email and open it)

Sorry, we don't have time to do support/porting for free.
A good Winsock programming book should explain the differences
between Winsock and UNIX implementations. This may help you.

[rodney]

Mark is right that you should reference a Winsock book for some
background information. The reason for this is that the WinSock
TcpIp driver is used by both Interix and Windows. This allows for
coordination between the two. So the underlying rules apply to
both Interix and Windows because of how the driver is implemented.

On Unix machines ports 1024 and lower are restricted to root.
Winsock doesn't make this distinction because of it's mis-spent youth.
So this is not an error. It's just the way it is.

For multiple processes camping on the same port this too is allowed.
The rule is first there gets the port. You have more than one process
listed as camped there, but the first one wins. To protect against this
to a certain degree I extended inetd to do port camping to prevent spoofing
by an ordinary user. There are comments in the file "/etc/inetd.conf" which
you can read.

[aotto1968]

Hi,

thanks for the answer ...
yes you are right, I have no "winsock" background
even I have not as mutch windows backgroud too.

but this was was answer I need:

1) multiple listeners on same port are allowed ...
even if the first on wins but the second
one does not get an "error" message.
-> the process just wait forever

2) low ports are allowed, ok
I have only done a comparison between Interix
and Linux

mfg

aotto