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Date: Wed, 19 Nov 2003 13:14:21 -0800 (PST)
From: John Polstra <jdp@polstra.com>
To: "Crist J. Clark" <cjc@freebsd.org>
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cc: net@freebsd.org
Subject: RE: netgraph(3) NGM_KSOCKET_BIND
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On 19-Nov-2003 Crist J. Clark wrote:
> OK, an easy one. I am trying to do some netgraph(3) coding in
> userland. From how I read the documentation, this should work. Before
> I go learn all of the netraph(4) kernel code to understand the error
> message, could someone tell me how this is supposed to look? I'm sure
> it's something obvious that I have missed.
> 
> The attached test program returns,
> 
>   # ./ngtest 
>   ngtest: failed to bind ksocket: Invalid argument
[...]
>         bzero(&laddr, sizeof laddr);
>         laddr.sin_family = AF_INET;
>         laddr.sin_addr.s_addr = INADDR_ANY;
>         laddr.sin_port = htons(DEFAULT_PORT);
>         if (NgSendMsg(cs, OUR_HOOK_CTL, NGM_KSOCKET_COOKIE, NGM_KSOCKET_BIND,
>             &laddr, sizeof laddr) == -1)
>                 err(errno, "failed to bind ksocket");

I think the problem might be that you forgot to set the "sin_len"
member of the sockaddr_in struct.  I don't see anything else
glaringly wrong.

John