Re: netgraph(3) NGM_KSOCKET_BIND

From: Crist J. Clark (cristjc_at_comcast.net)
Date: 11/20/03

  • Next message: Benjamin Lauzière: "Simple Routing" 
    Date: Wed, 19 Nov 2003 18:42:32 -0800
To: John Polstra <jdp@polstra.com>

    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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