core-agent-linux/common/qubes_setup_dnat_to_ns
Rafal Wojtczuk c0f47663c8 Unify dom0 and netvm sysconfig/iptables
Plus:
- dedicated chain for DNAT to nameservers
- prevent intervm networking. Can be conveniently overriden in necessary cases
by inserting ACCEPT clauses (per VM, probably) at the top of FORWARD
2010-09-06 15:10:01 +02:00

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#!/bin/sh
addrule()
{
if [ $FIRSTONE = yes ] ; then
FIRSTONE=no
RULE1="-A PR-QBS -d $NS1 -p udp --dport 53 -j DNAT --to $1"
else
RULE2="-A PR-QBS -d $NS2 -p udp --dport 53 -j DNAT --to $1"
NS=$NS2
fi
}
export PATH=$PATH:/sbin:/bin
source /var/run/qubes/qubes_ns
if [ "X"$NS1 = "X" ] ; then exit ; fi
iptables -t nat -F PR-QBS
FIRSTONE=yes
grep ^nameserver /etc/resolv.conf | head -2 |
(
while read x y z ; do
addrule "$y"
done
(echo "*nat"; echo $RULE1; echo $RULE2; echo COMMIT) | iptables-restore -n
)