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262 lines
6.4 KiB
262 lines
6.4 KiB
#!/bin/bash
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# Copyright 2010 Google Inc.
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# All right reserved.
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# Author: Szymon Jakubczak <szym@google.com>
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#
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# Configure the host and the Android phone for "reverse tethering".
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# (Route all network traffic via the host.)
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# default values
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: ${BRIDGE:=usbeth}
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: ${LAN_DEV:=eth0} # LAN uplink on the host
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: ${HOST_DEV:=usb0} # name of the RNDIS interface on the host
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: ${PHONE_DEV:=rndis0} # name of the RNDIS interface on the phone
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: ${PHONE_IP:=192.168.77.2} # for NAT and tests
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: ${HOST_IP:=192.168.77.1}
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: ${NETMASK:=255.255.255.0}
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# location of the hwaddr utility
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: ${HWADDR:=/home/build/nonconf/google3/experimental/users/szym/moblat/hwaddr/hwaddr-armeabi}
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: ${PHONE_HW:=""} # hardware (Ethernet) address for the interface (bridge only)
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# for NAT configuration
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: ${DNS1:=8.8.8.8}
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: ${DNS2:=8.8.4.4}
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# export ADB=/path/to/sdk/adb for custom adb
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ADB="${ADB:-adb} ${SERIAL:+-s $SERIAL}"
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set -e
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trap error ERR
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error() {
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echo >&2 "Error occured: $?"
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}
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usage() {
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echo "Usage: $0 <command>"
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echo " rndis -- start RNDIS and test ping the phone"
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echo " nat -- use host as NAT"
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echo " nat+secure -- nat + extra security"
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echo " bridge -- use host as bridge"
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echo " stop -- switch back to 3G"
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echo " stop-all -- clean up everything"
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echo
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echo "Advanced Commands"
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echo " Host:"
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echo " nat_start "
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echo " nat_secure "
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echo " nat_stop "
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echo " bridge_start "
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echo " bridge_add "
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echo " bridge_stop "
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echo " Phone:"
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echo " rndis_start "
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echo " rndis_stop "
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echo " rndis_test "
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echo " route_nat "
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echo " route_bridge "
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echo " route_reset "
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echo
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echo "Options and Environment Variables:"
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echo " -h|--help"
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echo " -b bridge_name BRIDGE=$BRIDGE"
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echo " -s serial_number SERIAL=$SERIAL"
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echo " -u host_usb_device HOST_DEV=$HOST_DEV"
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echo " -l host_lan_device LAN_DEV=$LAN_DEV"
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echo " -d dns1 dns2 DNS1=$DNS1"
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echo " DNS2=$DNS2"
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echo " -p phone_ip PHONE_IP=$PHONE_IP"
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echo " -a host_ip HOST_IP=$HOST_IP"
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echo " -m netmask NETMASK=$NETMASK"
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echo " -e hardware_addr PHONE_HW=$PHONE_HW"
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echo
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echo " HWADDR=$HWADDR"
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echo " ADB=$ADB"
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}
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##################################
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### PHONE configuration routines
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##################################
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rndis_start() {
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echo "Starting RNDIS..."
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$ADB wait-for-device
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$ADB shell "svc usb setFunction rndis"
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$ADB wait-for-device
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$ADB shell "ifconfig $PHONE_DEV down"
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if [[ -n "$PHONE_HW" ]]; then
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$ADB push $HWADDR /data/local/hwaddr # TODO(szym) handle failures?
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$ADB shell "/data/local/hwaddr $PHONE_DEV $PHONE_HW"
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$ADB shell "/data/local/hwaddr $PHONE_DEV"
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fi
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}
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rndis_stop() {
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$ADB shell "svc usb setFunction" #empty to clear
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}
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rndis_test() {
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# configure some IPs, so that we can ping
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$ADB shell "ifconfig $PHONE_DEV $PHONE_IP netmask $NETMASK up"
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sudo ifconfig $HOST_DEV $HOST_IP netmask $NETMASK up
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echo "Pinging the phone..."
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ping -q -c 1 -W 1 $PHONE_IP
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echo "Success!"
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}
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update_dns() {
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$ADB shell 'setprop net.dnschange $((`getprop net.dnschange`+1))'
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}
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default_routes() {
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$ADB shell 'cat /proc/net/route' | awk '{ if ($2==00000000) print $1 }'
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}
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route_none() {
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$ADB shell "svc data disable"
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$ADB shell "svc wifi disable"
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# kill all default route interfaces (just in case something remains)
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for dev in `default_routes`; do
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$ADB shell "ifconfig $dev down"
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done
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}
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route_nat() {
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echo "Setting up phone routes and DNS..."
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route_none
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$ADB shell "ifconfig $PHONE_DEV $PHONE_IP netmask $NETMASK up"
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$ADB shell "route add default gw $HOST_IP dev $PHONE_DEV"
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$ADB shell "setprop net.dns1 $DNS1"
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$ADB shell "setprop net.dns2 $DNS2"
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update_dns
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}
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route_bridge() {
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echo "Running DHCP on the phone..."
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route_none
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$ADB shell "ifconfig $PHONE_DEV up"
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$ADB shell "netcfg $PHONE_DEV dhcp"
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$ADB shell "ifconfig $PHONE_DEV" # for diagnostics
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DNS1=`$ADB shell getprop net.${PHONE_DEV}.dns1`
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$ADB shell "setprop net.dns1 $DNS1"
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DNS2=`$ADB shell getprop net.${PHONE_DEV}.dns2`
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$ADB shell "setprop net.dns2 $DNS2"
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update_dns
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}
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route_reset() {
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route_none
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$ADB shell "svc data enable"
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}
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#################################
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### HOST configuration routines
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#################################
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nat_start() {
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echo "Configuring NAT..."
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sudo sysctl -w net.ipv4.ip_forward=1
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sudo iptables -F
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sudo iptables -t nat -F
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sudo iptables -t nat -A POSTROUTING -o $LAN_DEV -j MASQUERADE
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sudo iptables -P FORWARD ACCEPT
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sudo ifconfig $HOST_DEV $HOST_IP netmask $NETMASK up
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}
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nat_secure() {
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echo "Making your NAT secure..."
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sudo iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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sudo iptables -A FORWARD -m state --state NEW -i $HOST_DEV -j ACCEPT
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sudo iptables -P FORWARD DROP
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sudo ifconfig usb0 $HOST_IP netmask $NETMASK up
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}
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nat_stop() {
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sudo sysctl -w net.ipv4.ip_forward=0
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sudo iptables -F
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sudo iptables -t nat -F
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}
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bridge_start() {
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echo "Configuring bridge..."
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sudo brctl addbr $BRIDGE || return 0 # all good
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sudo brctl setfd $BRIDGE 0
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sudo ifconfig $LAN_DEV 0.0.0.0
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sudo brctl addif $BRIDGE $LAN_DEV
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sudo dhclient $BRIDGE || {
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echo "DHCP failed. Recovering..."
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bridge_stop
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false
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}
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}
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bridge_add() {
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echo "Adding usb0 to the bridge"
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sudo brctl delif $BRIDGE $HOST_DEV 2>/dev/null || true # ignore
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sudo ifconfig $HOST_DEV 0.0.0.0
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sudo brctl addif $BRIDGE $HOST_DEV
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}
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bridge_stop() {
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sudo ifconfig $BRIDGE down || true # ignore errors
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sudo brctl delbr $BRIDGE || true
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sudo dhclient $LAN_DEV
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}
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### command-line interpreter
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if [ $# == "0" ]; then
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usage
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fi
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while (( $# )); do
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case $1 in
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--help|-h)
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usage
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exit
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;;
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-b) shift; BRIDGE=$1 ;;
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-s) shift; SERIAL=$1 ;;
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-u) shift; HOST_DEV=$1 ;;
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-l) shift; LAN_DEV=$1 ;;
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-d) shift; DNS1=$1; shift; DNS2=$1 ;;
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-p) shift; PHONE_IP=$1 ;;
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-a) shift; HOST_IP=$1 ;;
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-m) shift; NETMASK=$1 ;;
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-e) shift; PHONE_HW=$1 ;;
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rndis)
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rndis_start
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rndis_test
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;;
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bridge)
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ifconfig $HOST_DEV >/dev/null || $0 rndis
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bridge_start
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bridge_add
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route_bridge
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;;
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nat)
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ifconfig $HOST_DEV >/dev/null || $0 rndis
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nat_start
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route_nat
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;;
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nat+secure)
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$0 nat
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nat_secure
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;;
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stop)
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route_reset
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;;
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stop-all)
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bridge_stop
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nat_stop
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route_reset
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rndis_stop
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;;
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*) # execute 'advanced command' by function name
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$1
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;;
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esac
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shift
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done
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