Date: 09 Nov 2005 09:28:20 -0500 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: David Kelly <dkelly@hiwaay.net> Cc: FreeBSD-Questions@FreeBSD.org Subject: Re: devfs and bpf owner, group, and mode Message-ID: <44wtjhaoaj.fsf@be-well.ilk.org> In-Reply-To: <20051108150817.GA47825@Grumpy.DynDNS.org> References: <20051108150817.GA47825@Grumpy.DynDNS.org>
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David Kelly <dkelly@hiwaay.net> writes: > I'm having problems in 5.4 getting automatic ownership and mode correct > on /dev/bpf2. Added this to /etc/devfs.conf: > > # Allow group tcpdump to use bpf* > own bpf0 root:tcpdump > perm bpf0 0660 > own bpf1 root:tcpdump > perm bpf1 0660 > own bpf2 root:tcpdump > perm bpf2 0660 > > And this to /etc/devfs.rules: > > [devfsrules_bpf=5] > add path 'bpf*' mode 0660 group tcpdump > > The intent is to allow members of group "tcpdump" to use /dev/bpf2 > without being root. The above creates /dev/bpf[012] as desired at boot > but some time later /dev/bpf2 disappears. > > System has two NICs, xl0 and fxp0. At this time fxp0 is not being used. > Vlan0 is configured (as a VLAN of course) on xl0, and thats where I need > /dev/bpf2 for tcpdump to see what my stuff is doing. > > If missing, /dev/bpf2 is created automatically when tcpdump opens, but > its not created with the same ownership and mode as during reboot. > > Suspect my problem is related to [devfsrules_bpf=5] or the fact I > haven't informed the system to apply this rule to the /dev filesystem. Good guess. I'm still on my first cup of coffee, and might have taken a few more minutes to spot that. > So where is the 'i' that I've failed to dot? try adding 'devfs_system_ruleset="devfsrules_bpf"' to rc.conf. To apply it before reboot would be something roughly like 'devfs /dev ruleset devfsrules_bpf'. -- Lowell Gilbert, embedded/networking software engineer, Boston area http://be-well.ilk.org/~lowell/
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