TCP socket - how to get rid?

Hello!

Have Linux means to enforce some TCP socket to close?
e.g. send to the peer CLOSE, or maybe simply destroy filehandle.
If the proccess waits for "read" or "recv" on such socket,
it would get a normal closure or an error, not waits forever.

Of course, I ask not about socket API,
but about how to destroy a socket owned by another process.


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Innocenti Maresin wrote:

> Hello!
>
> Have Linux means to enforce some TCP socket to close?
> e.g. send to the peer CLOSE, or maybe simply destroy filehandle.
> If the proccess waits for "read" or "recv" on such socket,
> it would get a normal closure or an error, not waits forever.
>
> Of course, I ask not about socket API,
> but about how to destroy a socket owned by another process.
>
>

I guess with a raw socket you can do *whatever* you want.
I do not see no reason why you could not construct a
TCP packet that can be sent to the signaling a close. Seems
reasonable to me.

Chris Fowler wrote:
> I guess with a raw socket you can do *whatever* you want.
> I do not see no reason why you could not construct a
> TCP packet that can be sent to the signaling a close.

Yes, theoretically it is possible to sent to peer a packet imitating normal TCP CLOSE,
but how to get proper Acknowledgement number? compute a Sequence number?
Who will set the state of TCP socket in the kernel to FIN-WAIT-1?

I suppose that some techniques of socket manipulating are _already_ developped,
at least some experience exists,
and I will happy to get some information on it,
not man-known things that raw socket can send arbitrary IP data.


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