Passing argument to setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,in tr)

[Richard Taylor]

Hi

Does anyone know the correct way to pass the 'device' argument to setsockopt
with the SO_BINDTODEVICE flag?

I have tried various methods:

setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,"e th0")
setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,in et_aton("eth0"))
setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,st ruct.pack("s","eth0"))
setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,st ruct.pack("p","eth0"))

None of these work. I just get a "socket.error: (19, 'No such device')".

I do have an "eth0" device :-)

Many thanks

Richard

[Richard Taylor]

Richard Taylor wrote:

Hi

Does anyone know the correct way to pass the 'device' argument to
setsockopt with the SO_BINDTODEVICE flag?

I have tried various methods:

setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,"e th0")
setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,in et_aton("eth0"))
setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,st ruct.pack("s","eth0"))
setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,st ruct.pack("p","eth0"))

None of these work. I just get a "socket.error: (19, 'No such device')".

I do have an "eth0" device :-)

Many thanks

Richard

Solved it!

So for others that find this in the news archive...

The answer is:

s.setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE, struct.pack("%ds" %
(len("eth0")+1,), "eth0"))

Richard

[Jeff Epler]

On Wed, Apr 21, 2004 at 12:22:41PM +0000, Richard Taylor wrote:

The answer is:

s.setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE, struct.pack("%ds" %
(len("eth0")+1,), "eth0"))
Richard Taylor wrote:

Maybe this is simpler:
#dev = "eth0"
s.setsockopt(..., dev + '\0')
I think it has the same effect as your code, but it is a little clearer
to me that the setsockopt call needs a zero-terminated C string as its
argument.

Jeff

[Richard Taylor]

Jeff Epler wrote:

On Wed, Apr 21, 2004 at 12:22:41PM +0000, Richard Taylor wrote:

The answer is:

s.setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE, struct.pack("%ds" %
(len("eth0")+1,), "eth0"))
Richard Taylor wrote:

Maybe this is simpler:
#dev = "eth0"
s.setsockopt(..., dev + '\0')
I think it has the same effect as your code, but it is a little clearer
to me that the setsockopt call needs a zero-terminated C string as its
argument.

Jeff

You are right. I did not realise that you could append a null in that way.

Thanks.

Richard

[дамјан г.]

> Does anyone know the correct way to pass the 'device' argument to

setsockopt with the SO_BINDTODEVICE flag?

I have tried various methods:

setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,"e th0")
setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,in et_aton("eth0"))
setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,st ruct.pack("s","eth0"))

I think you need
struct.pack("5s","eth0")
--
Дамјан (jabberID:da****@bagra.net.mk)

A: Because it reverses the logical flow of converstion.
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