Date: Wed, 19 Nov 2003 18:42:32 -0800 From: "Crist J. Clark" <cristjc@comcast.net> To: John Polstra <jdp@polstra.com> Cc: net@freebsd.org Subject: Re: netgraph(3) NGM_KSOCKET_BIND Message-ID: <20031120024232.GB48914@blossom.cjclark.org> In-Reply-To: <XFMail.20031119131421.jdp@polstra.com> References: <20031119070745.GE10828@blossom.cjclark.org> <XFMail.20031119131421.jdp@polstra.com>
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On Wed, Nov 19, 2003 at 01:14:21PM -0800, John Polstra wrote:
> 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.
Duh. That was it. Thanks.
I didn't think I had messed up the sockaddr_in because I stuck a plain
ol' bind(2) call in there as a test, and it worked. It didn't seem to
care I forgot to set sin_len.
--
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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