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Newsgroups: comp.lang.python
Date: Wed, 22 Aug 2012 00:29:37 -0700 (PDT)
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Subject: Re: How to set the socket type and the protocol of a socket using create_connection?
From: Guillaume Comte <guillaume.comte10@gmail.com>
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Xref: csiph.com comp.lang.python:27612

Le mercredi 22 ao=FBt 2012 04:10:43 UTC+2, Dennis Lee Bieber a =E9crit=A0:
> On Tue, 21 Aug 2012 10:00:28 -0700 (PDT), Guillaume Comte
>=20
> <guillaume.comte10@gmail.com> declaimed the following in
>=20
> gmane.comp.python.general:
>=20
>=20
>=20
> 	A later follow-up
>=20
> > Unfortunatly, my_socket.bind((src_addr, 1)) doesn't work. I get the err=
or message: "socket.error: [Errno 49] Can't assign requested address"...
>=20
> >=20
>=20
>=20
>=20
> 	Since .bind() is used to set up a /listener/, the network stack
>=20
> (LINK layer) probably has to be tied to the IP address; that is, a valid
>=20
> "source" address needs to be supplied to .bind.
>=20
Do you mean that an alias is not a valid source address? Because ping.c can=
 do it...

I've also tried changing the port to 3333 or 8080 but the same error happen=
s.
>=20
>=20
>=20
>=20
> > But when I try to set a source address, I still get the same error mess=
age...
>=20
> >=20
>=20
> > Does anyone know how I could build the IP header (I don't even know if =
it can be the solution but it's worth a try...)?
>=20
>=20
>=20
> 	Based upon http://linux.die.net/man/7/raw "Raw sockets allow new
>=20
> IPv4 protocols to be implemented in user space. A raw socket receives or
>=20
> sends the raw datagram not including link level headers. " implies that
>=20
> you need to build the entire IP packet for your ICMP message... That
>=20
> means you do NOT use socket methods to set fields -- you'll probably
>=20
> have to use something like the struct module to lay out the entire IP
>=20
> packet /including/ header contents, and then pass that as-is to the
>=20
> socket.
>=20
>=20
>=20
> --=20
>=20
> 	Wulfraed                 Dennis Lee Bieber         AF6VN
>=20
>         wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/