Here is the script I promised Martin.
>From f7333e727d7c3d89c3f6bc727dba7061d7ae584d Mon Sep 17 00:00:00 2001
From: Joshua Pritikin
Date: Fri, 7 Aug 2009 10:26:23 +0530
Subject: [PATCH] Automate iptable rules generation
---
sysconfig/iptables-config |7 +
sysconfig/olpc-scripts/gen-iptables | 46 +++
sysconfig/xs_wan_device |1 +
3 files changed, 49 insertions(+), 5 deletions(-)
create mode 100755 sysconfig/olpc-scripts/gen-iptables
create mode 100644 sysconfig/xs_wan_device
diff --git a/sysconfig/iptables-config b/sysconfig/iptables-config
index 819d809..f22076e 100755
--- a/sysconfig/iptables-config
+++ b/sysconfig/iptables-config
@@ -7,11 +7,8 @@
## config settings
SERVER_NUM=`cat /etc/sysconfig/xs_server_number`
if [ $SERVER_NUM=1 ];then
-if [ -e /etc/sysconfig/xs_httpcache_on ]; then
- IPTABLES_DATA=/etc/sysconfig/olpc-scripts/iptables.principal.cache
-else
- IPTABLES_DATA=/etc/sysconfig/olpc-scripts/iptables.principal
-fi
+IPTABLES_DATA=/etc/sysconfig/olpc-scripts/iptables-xs
+/etc/sysconfig/olpc-scripts/gen-iptables > $IPTABLES_DATA
fi
# Load additional iptables modules (nat helpers)
diff --git a/sysconfig/olpc-scripts/gen-iptables b/sysconfig/olpc-scripts/gen-iptables
new file mode 100755
index 000..e67cdfa
--- /dev/null
+++ b/sysconfig/olpc-scripts/gen-iptables
@@ -0,0 +1,46 @@
+#!/usr/bin/python
+
+import re;
+import os;
+import logging;
+
+#sysconfig = './' # for testing
+sysconfig = '/etc/sysconfig/'
+
+wan = 'eth0'
+try:
+ conf = sysconfig + 'xs_wan_device'
+ file = open(conf)
+ wan = file.readline()
+ wan = re.sub(r'\s$', '', wan)
+except IOError:
+ logging.warning(conf + " not found, assuming "+wan)
+
+try:
+ conf = sysconfig + 'xs_httpcache_on'
+ os.stat(conf)
+ squid = 1
+except OSError:
+ squid = 0
+
+#print("wan="+wan+" squid=%i" % squid)
+
+print '''\
+*nat
+:PREROUTING ACCEPT [0:0]
+:POSTROUTING ACCEPT [0:0]
+:OUTPUT ACCEPT [0:0]'''
+
+if squid:
+ for inf in ('lanbond0', 'mshbond0', 'mshbond1', 'mshbond2'):
+ print '-A PREROUTING -i %s -p tcp --dport 80 -j REDIRECT --to-ports 3128' % inf
+
+print '-A POSTROUTING -o %s -j MASQUERADE' % wan
+
+print '''\
+COMMIT
+*filter
+:INPUT ACCEPT [0:0]
+:FORWARD ACCEPT [0:0]
+:OUTPUT ACCEPT [0:0]
+COMMIT'''
diff --git a/sysconfig/xs_wan_device b/sysconfig/xs_wan_device
new file mode 100644
index 000..d4398d5
--- /dev/null
+++ b/sysconfig/xs_wan_device
@@ -0,0 +1 @@
+ppp0
--
1.6.0.6
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