From 4687983a57d1acdcb90e39de555d04d8b1ced795 Mon Sep 17 00:00:00 2001
From: ache <ache@ache.one>
Date: Sat, 17 Feb 2018 00:28:46 +0100
Subject: [autoDHCP] ake iptables

---
 autoDHCP.sh | 80 ++++++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 56 insertions(+), 24 deletions(-)

diff --git a/autoDHCP.sh b/autoDHCP.sh
index f6e144d..7b39de3 100755
--- a/autoDHCP.sh
+++ b/autoDHCP.sh
@@ -3,21 +3,58 @@
 interface="";
 server="dhcpd"
 ip="10.5.5.11"
-range="/24"
+range="24"
+interface_internet=""
 
-# Todo : List interface ✓ 
+# Todo : List interface ✓
 #        Select first ✓
 #        Select dhcpd or dnsmasq ✓
 #        Select ip range ✓
 #        Select ip ✓
 #        Help ✓
 #        Install from Makefile ✓
+#        Add support for tethapp
+#        dnsmasq config overwrite
 
 # Default interface is the first non-wireless interfaces (sorted alpha-num)
 
+function guess_nowifi {
+    for i in `ls /sys/class/net/`; do
+        if [ ! -d "/sys/class/net/$i/wireless" ] ; then 
+            if [ "$interface" ] ; then 
+                if [[ "$i" < "$înterface" ]] ; then
+                    interface="$i"
+                fi
+            else
+                interface="$i"
+            fi
+        fi
+    done
+}
+function guess_internet {
+    echo $(ip route show | grep 'default' |  \
+                    sed 's/.*dev/dev/' | sed 's/scope//' | \
+                    sed 's/src \([[:digit:]]\{1,3\}\.\)\{3\}[[:digit:]]\{1,3\}//g' | \
+                    sed 's/link//' |
+                    tr -s ' ' |
+                    cut -d' ' -f 2)
+}
+
+
+
+
+
+
 if [ "$1" == "dns" ] ; then
     server="dnsmasq"
     shift
+elif [ "$1" == "teth" ] ; then
+  interface_internet=$(guess_internet)
+  shift
+elif [ "$1" == "teth_dns" ] ; then
+  interface_internet=$(guess_internet)
+  server="dnsmasq"
+  shift
 fi
 
 if [ "$1" == "help" -o "$1" == "-h" -o "$1" == "--help" ] ; then
@@ -52,36 +89,22 @@ if [ "$3" == "dns" ] ; then
     server="dnsmasq"
 fi
 
+IFS='.' read -r -a ipList <<< "$ip"
+mask=$(( 4294967295 >> 32-${range} << 32-${range} ))
+ipRaw=$(( ipList[0]*2**24 + ipList[1]*2**16 + ipList[2]*2**8 + ipList[3] ))
+ipNetRaw=$(( ipRaw & mask ))
 
-
-
-
-
-
-function guess_nowifi {
-    for i in `ls /sys/class/net/`; do
-        if [ ! -d "/sys/class/net/$i/wireless" ] ; then 
-            if [ "$interface" ] ; then 
-                if [[ "$i" < "$înterface" ]] ; then
-                    interface="$i"
-                fi
-            else
-                interface="$i"
-            fi
-        fi
-    done
-}
-
-
+ipNet="$(( ipNetRaw >> 24 )).$(( ipNetRaw >> 16 & 255 )).$(( ipNetRaw >> 8 & 255)).$(( ipNetRaw & 255))"
 
 if [ -z "$interface" ] ; then
-    guess_nowifi
+  guess_nowifi
 fi
 
 sudo ip l set "$interface" up
 sudo ip a r "${ip}/${range}" dev "$interface"
+#sudo ip r a "${ip}/${range}" dev "$interface" src "${ip}"
 
-if [ "$server" == "dhcpd" ] ; then 
+if [ "$server" == "dhcpd" ] ; then
     sudo /usr/bin/dhcpd -4 -q -pf /run/dhcpd4.pid "$interface"
 elif [ "$server" == "dnsmasq" ] ; then
 
@@ -107,4 +130,13 @@ else
     echo "Server name ${server} unknow"
 fi
 
+
+if [ -n "$interface_internet" ] ; then
+  echo "Routage des connections internet (${interface_internet} => ${interface})"
+  sudo iptables -t nat -A POSTROUTING -o "${interface_internet}" -j MASQUERADE
+  sudo iptables -A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+  sudo iptables -A FORWARD -i "${interface}" -o "${interface_internet}" -j ACCEPT
+fi
+
+
 echo 'Should be ready ;)'
-- 
cgit v1.2.3