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Diffstat (limited to 'media/cast/test/utility/shadow.sh')
| -rwxr-xr-x | media/cast/test/utility/shadow.sh | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/media/cast/test/utility/shadow.sh b/media/cast/test/utility/shadow.sh new file mode 100755 index 0000000..4163fd0 --- /dev/null +++ b/media/cast/test/utility/shadow.sh @@ -0,0 +1,121 @@ +#!/bin/sh +# Copyright 2014 The Chromium Authors. All rights reserved. +# Use of this source code is governed by a BSD-style license that can be +# found in the LICENSE file. +# +# The purpose of this script is to set up all the neccessary magic to +# pipe network traffic through a user-space process. That user-space +# process can then delay, reorder and drop packets as it pleases to +# emulate various network environments. +# +# The script currently assumes that you communicate with your cast streaming +# receiver through eth1. After running "shadow.sh start", your network will +# look something like this: +# +# +--------------------------------------------------+ +# | Your linux machine | +# | +---------------+ | +# cast | |shadowbr bridge| +-------------+ | +# streaming <--+-+---> eth1 | |routing table| | +# receiver | | tap2 <---+-> tap_proxy <-+-> tap1 | | +# | | +->veth | | eth0 <----+--+->internet +# | +--+------------+ | lo | | +# | | +-------------+ | +# | | +------------------+ ^ | +# | | |shadow container | | | +# | +------+-->veth | chrome | +# | | netload.py server| netload.py client| +# | +------------------+ | +# +--------------------------------------------------+ +# +# The result should be that all traffic to/from the cast streaming receiver +# will go through tap_proxy. All traffic to/from the shadow container +# will also go through the tap_proxy. (A container is kind of like a +# virtual machine, but more lightweight.) Running "shadow.sh start" does +# not start the tap_proxy, so you'll have to start it manually with +# the command "tap_proxy tap1 tap2 <network_profile>" where +# <network_profile> is one of "perfect", "good", "wifi", "bad" or "evil". +# +# While testing mirroring, we can now generate TCP traffic through +# the tap proxy by talking to the netload server inside the "shadow" +# container by using the following command: +# +# $ netload.py upload IP PORT +# +# The IP and PORT are printed out by this script when you run +# "shadow.sh start", but will generally be the *.*.*.253 address +# of the eth1 network, so hopefully that's not already taken... + +set -x + +DEV=eth1 +TAP1=tap1 +TAP2=tap2 + +IP="$(ifconfig $DEV | sed -n 's@.*inet addr:\([^ ]*\).*@\1@gp')" +MASK="$(ifconfig $DEV | sed -n 's@.*Mask:\([^ ]*\).*@\1@gp')" +BCAST="$(ifconfig $DEV | sed -n 's@.*Bcast:\([^ ]*\).*@\1@gp')" +NET=$(route -n | grep $DEV | head -1 | awk '{print $1}') +DIR=$(dirname "$0") + +case "$MASK" in + 255.255.255.0) MASK_BITS=24 ;; + 255.255.0.0) MASK_BITS=16 ;; + 255.0.0.0) MASK_BITS=8 ;; + *) + echo "Unknown network mask" + exit 1 + ;; +esac + +SHADOWIP="$(echo $IP | sed 's@[^.]*$@@g')253" +SHADOWCONF="/tmp/shadowconf.$$" +cat <<EOF >$SHADOWCONF +lxc.utsname = shadow +lxc.network.type = veth +lxc.network.link = shadowbr +lxc.network.flags = up +lxc.network.ipv4 = $SHADOWIP/$MASK_BITS +lxc.network.ipv4.gateway = $IP +lxc.kmsg = 0 +EOF + +trap "rm $SHADOWCONF" SIGINT SIGTERM EXIT +LXC_COMMON="-n shadow -f $SHADOWCONF" + +case "$1" in + start) + openvpn --mktun --dev $TAP1 + openvpn --mktun --dev $TAP2 + ifconfig $TAP1 $IP netmask $MASK broadcast $BCAST up + ifconfig $TAP2 up + route add -net $NET netmask $MASK $TAP1 + brctl addbr shadowbr + brctl addif shadowbr $TAP2 $DEV + ifconfig shadowbr up + lxc-create $LXC_COMMON + lxc-execute $LXC_COMMON -- \ + "$DIRNAME/netload.py listen 9999" >/dev/null </dev/null 2>&1 & + echo "Now run: tap_proxy $TAP1 $TAP2 wifi" + echo "Data sink/source is available on $SHADOWIP 9999" + ;; + + stop) + lxc-kill -n shadow + sleep 1 + lxc-destroy $LXC_COMMON + ifconfig $TAP1 down + ifconfig $TAP2 down + ifconfig shadowbr down + brctl delbr shadowbr + openvpn --rmtun --dev $TAP1 + openvpn --rmtun --dev $TAP2 + ;; + + *) + echo "$0 start/stop" + echo "Read $0 for more information." + ;; +esac + + |