Bug 108345 – dhcpcd should execute /etc/dhcpc/dhcpcd.exe if it's going to override -c

• Status: VERIFIED TEST-REQUEST
• Product: Gentoo Linux

[Description Daniel Ceregatti 2005-10-06 20:51:30 UTC]

man dhcpcd

-- snip --

       -c <ExecFilePath>
              dhcpcd  will  try  to  execute <ExecFilePath> script instead of
default /etc/dhcpc/dhcpcd.exe script every time it configures or brings down the
interface. See the description of dhcpcd.exe script in FILES section below.

ps auxww | grep dhcpcd

/sbin/dhcpcd -h bubba -R -N -d -o -m 0 -c
/lib/rcscripts/net.modules.d/helpers.d/dhcpcd-wrapper -e
/var/lib/net-scripts/state/eth0 eth0

grep exe /lib/rcscripts/net.modules.d/helpers.d/dhcpcd-wrapper

Unless I missed something here, the expected behavior of dhcpcd executing
/etc/dhcpc/dhcpcd.exe just isn't happening.

Perhaps something needs to happen in /etc/conf.d/net? Perhaps
/lib/rcscripts/net.modules.d/helpers.d/dhcpcd-wrapper should call the default
dhcpcd exe script?

[Comment 1 Jakub Moc (RETIRED) 2005-10-07 00:14:23 UTC]

I've really missed the point of this bug... the wrapper script is in
/lib/rcscripts/net.modules.d/helpers.d/dhcpcd-wrapper and dhcpcd calls it w/ -c
option as per man page.

Closing INVALID.

[Comment 2 Daniel Ceregatti 2005-10-07 13:31:02 UTC]

It seems that you've missed my point. Let me give you a real world scenario:

My machine at home uses dhcp to get its IP address from my cable modem provider.
In the past, I've used the dhcpcd.exe file (per the man page) to 1) update my
host name against my dyndns, 2) setup my somewhat complicated ipsec tunnel to my
office, and 3) run my iptables script to reflect the new IP.

This was actually working in gentoo, but then suddenly stopped working, because
of the bug I've reported here.

So, unless gentoo provides me the ability to always run a script when my dhcp
comes up, I'm going to insist that this is a bug.

So how about a few suggestions:

1) Make /lib/rcscripts/net.modules.d/helpers.d/dhcpcd-wrapper shell out to
/etc/dhcpc/dhcpcd.exe, if present and executable, with the expected arguments.

2) Provide some sort of facility in /etc/conf.d/net to execute an arbitrary
script when dhcp, be it dhcpcd or dhclient or whatever, obtains a new IP address.

Thoughts?

[Comment 3 Roy Marples (RETIRED) 2005-10-09 08:02:14 UTC]

http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=4&chap=5#doc_chap1

You can write a postup() function in /etc/conf.d/net which would work just as
well and would work for all dhcp clients (dhcpcd isn't the only choice). Example

postup() {
   local ip=$( interface_get_address "${IFACE}" )
   # Strip the CIDR part returned by baselayout-1.12.0
   ip="${ip%%/*}"
   register_dns_program "${ip}" $( hostname )
}

Of course, we can always let the dhcpcd wrapper run a script as well

[Comment 4 Roy Marples (RETIRED) 2005-10-09 08:31:40 UTC]

Created attachment 70227 [details, diff]
allows the use of the -c dhcpcd option

[Comment 5 Roy Marples (RETIRED) 2005-10-09 08:32:15 UTC]

Please test the above patch against baselayout-1.12.0_pre8 and tell me if it
works or not.

Thanks!

[Comment 6 Daniel Ceregatti 2005-10-11 12:29:00 UTC]

The patch didn't apply cleanly to baselayout-1.12.0_pre8-r2, which seems to be
the latest ~x86. If you provide such a patch, I'll gladly test it.

[Comment 7 Roy Marples (RETIRED) 2005-10-11 15:49:59 UTC]

pre9 is now in portage with this patch included

[Comment 8 Daniel Ceregatti 2005-10-11 18:08:02 UTC]

I'll test it once baselayout-1.12.0_pre9 hits portage and report back here.

[Comment 9 Daniel Ceregatti 2005-10-26 18:11:00 UTC]

Works great. Thanks.

[Comment 10 Daniel Ceregatti 2005-10-26 18:14:11 UTC]

Oops, clicked the wrong radio button.