Hi
I was writing a policy to do some fixups on my laptop when I'm on the
VPN, but weird things were happening. After narrowing down the problem
with a test policy, it seems that cfengine doesn't read the IPv4 address
of the tun0 device. Maybe a bug?
If I list the ip addresses on the machine, I get:
>
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> inet 127.0.0.1/8 scope host lo
> inet6 ::1/128 scope host
> valid_lft forever preferred_lft forever
> 2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN
> qlen 1000
> link/ether 00:27:13:65:69:4e brd ff:ff:ff:ff:ff:ff
> 3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen
> 1000
> link/ether 00:26:c6:4c:35:b2 brd ff:ff:ff:ff:ff:ff
> inet 192.168.0.5/24 brd 192.168.0.255 scope global wlan0
> inet6 fe80::226:c6ff:fe4c:35b2/64 scope link
> valid_lft forever preferred_lft forever
> 7: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1400 qdisc pfifo_fast
> state UNKNOWN qlen 500
> link/[65534]
> inet 10.20.18.160/32 scope global tun0
(used quoting to avoid line breaks)
However, this policy:
> body common control
> {
> inputs => {
> "cfengine_stdlib.cf",
> } ;
>
> bundlesequence => {"test"} ;
> }
>
> bundle agent test
> {
> vars:
> "octets" slist => { "1", "2", "3" } ;
> "ifaces" slist => { @(sys.interfaces) } ;
> "ip[$(ifaces)]" string => "$(sys.ipv4[$(ifaces)])" ;
>
>
> methods:
>
> reports:
> inform_mode|verbose_mode::
> "Interface: $(ifaces) ($(ip[$(ifaces)]))" ;
> "Octets 1-$(octets): $(sys.ipv4_$(octets)[$(ifaces)])" ;
> }
produces the following results:
> root@cooper:~# cf-agent -KI -f /var/cfengine/inputs/test-bundle.cf
> R: Interface: wlan0 (192.168.0.5)
> R: Interface: tun0 ($(sys.ipv4[tun0]))
> R: Octets 1-1: 192
> R: Octets 1-1: $(sys.ipv4_1[tun0])
> R: Octets 1-2: 192.168
> R: Octets 1-2: $(sys.ipv4_2[tun0])
> R: Octets 1-3: 192.168.0
> R: Octets 1-3: $(sys.ipv4_3[tun0])
So, apparently, cfengine is able to tell that tun0 is up and configured
and has an IP address, but is not able to tell the address. I understand
from the reference guide that an interface doesn't show up in
sys.interfaces if it's not up and configured with an IP address, so
that's a bit weird that $(sys.ipv4[tun0]) and friends are undefined...
Ciao
-- bronto
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