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#!/bin/bash
# Copyright 2014 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
if [ "$#" -lt 2 ]; then
cat 1>&2 <<EOF
$0 compiles a BPF expression to be passed to stenotype to apply a socket filter.
Its first argument is the interface (link type is required) and all other arguments
are passed to TCPDump.
Examples:
$0 eth0 dst port 80
$0 eth0 udp port 53
EOF
exit 1
fi
interface="$1"
shift
sudo tcpdump -i $interface -ddd $@ | tail -n+2 |
while read line; do
cols=( $line )
printf "%04x%02x%02x%08x" ${cols[0]} ${cols[1]} ${cols[2]} ${cols[3]}
done
echo ""
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