Import reverse tethering scripts

Full credit for creating these scripts goes to Paul Kocialkowski and
Riku Saikkonen.

2 files changed, 193 insertions, 0 deletions

diff --git a/networking/usb/device.sh b/networking/usb/device.sh
new file mode 100644
index 0000000..b95be13
--- /dev/null
+++ b/networking/usb/device.sh
@@ -0,0 +1,121 @@
+#!/system/bin/sh
+
+# Replicant USB Networking
+# ========================
+#
+# Copyright (C) 2011,2014 Paul Kocialkowski and Riku Saikkonen, GPLv3+
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set -e
+
+CFG_TYPE="static"               # default to "dhcp" or "static"
+USB_IFACE="rndis0"
+STATIC_IP="192.168.4.202"
+STATIC_IFCONFIG_OPTIONS=""      # e.g. "netmask 255.255.255.0"
+STATIC_GATEWAY="192.168.4.200"
+STATIC_DNS1="8.8.8.8"
+STATIC_DNS2=""
+
+start_rndis () {
+    #echo 1 >/sys/class/android_usb/android0/enable
+    #setprop sys.usb.config rndis,adb
+    svc usb setFunction rndis
+}
+
+stop_rndis () {
+    #echo 0 >/sys/class/android_usb/android0/enable
+    #setprop sys.usb.config mtp,adb
+    svc usb setFunction
+}
+
+if_up () {
+    #ifconfig $USB_IFACE up
+    netcfg $USB_IFACE up
+}
+
+if_down () {
+    #ifconfig $USB_IFACE down
+    netcfg $USB_IFACE down
+}
+
+dns_changed () {
+    # Signal possible change of DNS server to libc
+    setprop net.dnschange $((`getprop net.dnschange`+1))
+}
+
+configure_static () {
+    if_up
+    ifconfig $USB_IFACE $STATIC_IP $STATIC_IFCONFIG_OPTIONS
+    route add default gw $STATIC_GATEWAY dev $USB_IFACE
+    setprop net.dns1 "$STATIC_DNS1"
+    setprop net.dns2 "$STATIC_DNS2"
+    dns_changed
+    echo "Static IP $STATIC_IP configured"
+}
+
+configure_dhcp () {
+    echo "Configuring DHCP, please wait"
+    #if_up
+    #dhcpcd -d $USB_IFACE
+    netcfg $USB_IFACE dhcp
+    setprop net.dns1 "`getprop net.$USB_IFACE.dns1`"
+    setprop net.dns2 "`getprop net.$USB_IFACE.dns2`"
+    dns_changed
+    echo "DHCP configured"
+}
+
+configure () {
+    case "$CFG_TYPE" in
+        dhcp)
+            configure_dhcp
+            ;;
+        static)
+            configure_static
+            ;;
+        *)
+            echo "$0: invalid type: $CFG_TYPE" 1>&2
+            exit 1
+            ;;
+    esac
+}
+
+[ "" != "$2" ] && CFG_TYPE="$2"
+
+case "$1" in
+    start1)
+        echo "Starting Replicant USB networking, phase 1"
+        start_rndis
+        ;;
+    start2)
+        echo "Starting Replicant USB networking, phase 2"
+        configure
+        ;;
+    start)
+        echo "Starting Replicant USB networking"
+        start_rndis
+        echo "Please start connection sharing on host now!"
+        # work around short DHCP timeout by sleeping here
+        if [ "dhcp" = "$CFG_TYPE" ]; then
+            echo "Waiting 15 s"
+            sleep 15
+        fi
+        configure
+        ;;
+    stop)
+        echo "Stopping Replicant USB networking"
+        if_down
+        stop_rndis
+        ;;
+    *)
+        echo "Usage: sh $0 {start|start1|start2|stop} [{dhcp|static}]"
+        ;;
+esac
+
+exit 0
diff --git a/networking/usb/host.sh b/networking/usb/host.sh
new file mode 100644
index 0000000..a4e9345
--- /dev/null
+++ b/networking/usb/host.sh
@@ -0,0 +1,72 @@
+#!/bin/sh
+
+# Replicant USB Networking
+# ========================                             
+# 
+# Copyright (C) 2011 Paul Kocialkowski, GPLv3+
+# 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+IPTABLES_CLEAN_RULES=true
+
+USB_IFACE="usb0" 
+INTERNET_IFACE="eth0" 
+
+USB_IFACE_IP="192.168.4.200" 
+
+# Clean iptables rules
+
+iptables_rules_clean () {
+    if [ $IPTABLES_CLEAN_RULES = false ]
+    then
+        return
+    fi
+
+    iptables --flush
+    iptables --table nat --flush
+    iptables --delete-chain
+    iptables --table nat --delete-chain
+}
+
+# Inject iptables forwarding rules
+
+iptables_forward_rules_apply () {
+    iptables --table nat --append POSTROUTING --out-interface $INTERNET_IFACE -j MASQUERADE
+    iptables --append FORWARD --in-interface $USB_IFACE -j ACCEPT
+    echo 1 > /proc/sys/net/ipv4/ip_forward 
+}
+
+# Configure network link
+
+usb_networking_configure () {
+    ifconfig $USB_IFACE up
+    ifconfig $USB_IFACE $USB_IFACE_IP
+}
+
+usb_networking_disable () {
+    ifconfig $USB_IFACE down
+    echo 0 > /proc/sys/net/ipv4/ip_forward 
+}
+
+case $1 in
+    "start")
+        echo "Starting Replicant USB Networking" 
+        iptables_rules_clean
+        usb_networking_configure
+        iptables_forward_rules_apply
+    ;;
+    "stop")
+        echo "Stopping Replicant USB Networking" 
+        usb_networking_disable
+        iptables_rules_clean
+    ;;
+    *)
+        echo "Usage: sh $0 {start|stop}" 
+    ;;
+esac