Date: Thu, 17 Aug 2006 20:05:21 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Shriek <shriek.007@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Is it possible to trace the routing socket messages going from the kernel to a particular daemon Message-ID: <20060817200357.C45647@fledge.watson.org> In-Reply-To: <3ce33f6c0608170606o2f8542fcn15355a5afe3307a5@mail.gmail.com> References: <3ce33f6c0608170606o2f8542fcn15355a5afe3307a5@mail.gmail.com>
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On Thu, 17 Aug 2006, Shriek wrote:
> Is it possible that we can add some loadable module into the kernel to get a
> pid of a daemon-process and then somehow trace routing socket messages
> coming in / going out from the kernel to that particular daemon ? The thing
> why I am in need of this is that there are two daemons , one daemon is
> responsible for configuring the interfaces ...and the second is actually
> awaiting the updates from the kernel ( that it should send in case it sees
> that there is a change in the ifstate for the interface ---IFD update) ...
> any resources / material would be of great help.Thanks and regards.
This won't give you exactly what you want, but if you don't know about it
already, you probably will find it useful. "route monitor" monitors routing
socket messages generated by the kernel, and includes the pid of the process
they are destined for. It doesn't include messages sent to the kernel. As an
exampl:
TTY 1:
peppercorn# route monitor
got message of size 200 on Thu Aug 17 20:03:20 2006
RTM_GET: Report Metrics: len 200, pid: 784, seq 1, errno 0,
flags:<UP,GATEWAY,DONE,STATIC>
locks: inits:
sockaddrs: <DST,GATEWAY,NETMASK,IFP,IFA>
default 192.168.100.1 default fxp0:0.3.47.d3.46.47 192.168.100.198
TTY 2 after running route monitor on the first tty:
peppercorn:~> route -n get www.watson.org
route to: 209.31.154.41
destination: default
mask: default
gateway: 192.168.100.1
interface: fxp0
flags: <UP,GATEWAY,DONE,STATIC>
recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu
expire
0 0 0 0 0 0 1500 0
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