* TCP port numbers
@ 2004-11-01 3:33 ych43
2004-11-01 10:39 ` Jan Engelhardt
2004-11-01 12:38 ` Neil Horman
0 siblings, 2 replies; 3+ messages in thread
From: ych43 @ 2004-11-01 3:33 UTC (permalink / raw)
To: linux-kernel
Hi,
I got one question about unix socket functions. I have two machines (called A
and B). I use A to telnet B, get the root password of B. Is there any unix
socket function I can use to get the port number of A on B. Obviously, the
port number of B is 23. I want to use a socket function implemented on B to
get the port number of A because a TCP connection is established between them.
I greatly appreciate it if you help me. Thank you in advance.
Xue
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: TCP port numbers
2004-11-01 3:33 TCP port numbers ych43
@ 2004-11-01 10:39 ` Jan Engelhardt
2004-11-01 12:38 ` Neil Horman
1 sibling, 0 replies; 3+ messages in thread
From: Jan Engelhardt @ 2004-11-01 10:39 UTC (permalink / raw)
To: ych43; +Cc: linux-kernel
>Hi,
> I got one question about unix socket functions. I have two machines (called A
>and B). I use A to telnet B, get the root password of B. Is there any unix
>socket function I can use to get the port number of A on B. Obviously, the
The 'struct sockaddr_in' you're filling in on B's site with the call with
accept() also fills in the port number.
>port number of B is 23. I want to use a socket function implemented on B to
>get the port number of A because a TCP connection is established between them.
> I greatly appreciate it if you help me. Thank you in advance.
> Xue
Jan Engelhardt
--
Gesellschaft für Wissenschaftliche Datenverarbeitung
Am Fassberg, 37077 Göttingen, www.gwdg.de
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: TCP port numbers
2004-11-01 3:33 TCP port numbers ych43
2004-11-01 10:39 ` Jan Engelhardt
@ 2004-11-01 12:38 ` Neil Horman
1 sibling, 0 replies; 3+ messages in thread
From: Neil Horman @ 2004-11-01 12:38 UTC (permalink / raw)
To: ych43; +Cc: linux-kernel
ych43 wrote:
> Hi,
> I got one question about unix socket functions. I have two machines (called A
> and B). I use A to telnet B, get the root password of B. Is there any unix
> socket function I can use to get the port number of A on B. Obviously, the
> port number of B is 23. I want to use a socket function implemented on B to
> get the port number of A because a TCP connection is established between them.
> I greatly appreciate it if you help me. Thank you in advance.
> Xue
>
I think getpeername is the library call you are looking for
HTH
Neil
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/***************************************************
*Neil Horman
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*Red Hat, Inc.
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^ permalink raw reply [flat|nested] 3+ messages in thread
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