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261 lines
6.4 KiB
261 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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