linux-kernel - Re: [PATCH 10/17] Tools: hv: Gather ipv[4,6] gateway information

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Date:	Tue, 24 Jul 2012 13:36:50 -0500
From:	Dan Williams <dcbw@...hat.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Olaf Hering <olaf@...fle.de>,
	"K. Y. Srinivasan" <kys@...rosoft.com>, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	virtualization@...ts.osdl.org, apw@...onical.com,
	netdev@...r.kernel.org, ben@...adent.org.uk
Subject: Re: [PATCH 10/17] Tools: hv: Gather ipv[4,6] gateway information

On Tue, 2012-07-24 at 09:56 -0700, Stephen Hemminger wrote:
> On Tue, 24 Jul 2012 18:53:59 +0200
> Olaf Hering <olaf@...fle.de> wrote:
> 
> > On Tue, Jul 24, Stephen Hemminger wrote:
> > 
> > > On Tue, 24 Jul 2012 09:01:34 -0700
> > > "K. Y. Srinivasan" <kys@...rosoft.com> wrote:
> > > 
> > > > +	memset(cmd, 0, sizeof(cmd));
> > > > +	strcat(cmd, "/sbin/ip -f inet  route | grep -w ");
> > > > +	strcat(cmd, if_name);
> > > > +	strcat(cmd, " | awk '/default/ {print $3 }'");
> > > 
> > > 
> > > Much simpler method:
> > > 
> > > ip route show match 0/0
> > 
> > This also has the benefit that ip is not called with absolute path, now
> > that distros move binaries around.
> > 
> > Olaf
> 
> It is also not hard to do the same thing with a little function
> using libmnl

Yeah seriously, netlink anyone?  You'll even get nicer error reporting
that way.

Dan

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