lots of stuff lumped together

[distro-setup] / mail-route

diff --git a/mail-route b/mail-route
index a508e2e9b0a95d50add908ec3744c8ef90fd591d..d130ca966f6f037aa219ab2056858e48843540df 100755 (executable)
--- a/mail-route
+++ b/mail-route
@@ -59,12 +59,22 @@ esac
 # exim is replying to. I don't know why.
 #iptables -t mangle -A OUTPUT -m owner --uid-owner Debian-exim -j MARK --set-mark 0x1
 
+# match source or dest port. when we send to 25, it picks a random high port as
+# the source.
 
-e iptables -t mangle $iptables_op OUTPUT -m tcp -p tcp -m multiport --sports 25 -j MARK --set-mark 0x1
+for port in 25 143; do # smtp and imap.
+    e iptables -t mangle $iptables_op \
+      OUTPUT -m tcp -p tcp -m multiport --ports $port -j MARK --set-mark 0x1
+    e iptables -t mangle $iptables_op \
+    OUTPUT -m tcp -p tcp -m multiport --ports $port -j MARK --set-mark 0x0 \
+    -d 10.0.0.0/8,172.16.0.0/12,192.168.0.0/16
+# note, we could have used a custom chain and returned instead of setting the mark again.
+    # in case anyone was ever curious, the inverse of private ips is:   #0.0.0.0/5,8.0.0.0/7,11.0.0.0/8,12.0.0.0/6,16.0.0.0/4,32.0.0.0/3,64.0.0.0/2,128.0.0.0/3,160.0.0.0/5,168.0.0.0/6,172.0.0.0/12,172.32.0.0/11,172.64.0.0/10,172.128.0.0/9,173.0.0.0/8,174.0.0.0/7,176.0.0.0/4,192.0.0.0/9,192.128.0.0/11,192.160.0.0/13,192.169.0.0/16,192.170.0.0/15,192.172.0.0/14,192.176.0.0/12,192.192.0.0/10,193.0.0.0/8,194.0.0.0/7,196.0.0.0/6,200.0.0.0/5,208.0.0.0/4,224.0.0.0/3
+
+done
 e iptables -t nat $iptables_op POSTROUTING -o tun0 -m mark --mark 0x1 -j SNAT --to-source 10.8.0.4
 e ip rule $ip_op fwmark 1 table 1
 # note, this rule does not persist when the tun interface is deleted
 e ip route $ip_op default via 10.8.0.1 table 1
-e ip route $ip_op 192.168.1.0/24 via 192.168.1.1 dev br0 table 1
 
 exit 0