127 lines
3.7 KiB
Bash
Executable File
127 lines
3.7 KiB
Bash
Executable File
#!/bin/sh
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#
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# capture.sh, Copyright © 2011 Matteo Cypriani <mcy@lm7.fr>
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#
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########################################################################
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# This program is licensed under the terms of the Expat license.
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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########################################################################
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#
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# Captures a few packets on a Wi-Fi interface, using Tcpdump, and
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# writes them to a Pcap file along with some information about the
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# system. A tarball containing all these files is finally created.
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#set -x
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set -e
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error()
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{
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echo "$1"
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exit 1
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}
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[ $# -eq 1 ] \
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|| error "Usage: $0 <wifi_interface>"
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which tcpdump >/dev/null \
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|| error "tcpdump is required to run this program!"
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## Parameters (tune them if you want) ##
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# Number of packet to capture:
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NB_PKT=10
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# Temporary directory:
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TMP=/tmp
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# Name of the capture file:
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FILE=capture.pcap
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# Channel to scan
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CHANNEL=1
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## Generated parameters ##
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# Interface to capture from:
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IFACE=$1
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# Machine information:
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OS=`uname`
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HOSTNAME=`uname -n`
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echo -n "Shuting down interface $IFACE... "
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ifconfig $IFACE down && echo "OK." \
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|| error "Cannot shut down the interface!"
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echo -n "Switching interface $IFACE to monitor mode... "
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case $OS in
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Linux)
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[ -x /sbin/iwconfig ] \
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|| error "iwconfig is required to run this program on Linux!"
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iwconfig $IFACE mode monitor channel $CHANNEL \
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&& echo "OK." \
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|| error "Cannot configure the interface!"
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;;
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*)
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error "Your OS is not supported."
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;;
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esac
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echo -n "Turning up interface $IFACE... "
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ifconfig $IFACE up && echo "OK." \
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|| error "Cannot turn the interface up!"
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echo "Capturing $NB_PKT packets..."
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DIR=$(mktemp -d "$TMP"/capture_${OS}_${IFACE}_${HOSTNAME}-XXXXXXXX)
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FILE="$DIR/$FILE"
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tcpdump -i $IFACE -c $NB_PKT -w "$FILE"
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echo "Capture file \"$FILE\" created."
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echo -n "Gathering system information... "
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# Kernel & other information:
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uname -a >"$DIR"/uname-a
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# Wi-Fi interface information:
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ifconfig $IFACE >"$DIR"/ifconfig_$IFACE
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# PCI devices:
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which lspci >/dev/null \
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&& lspci >"$DIR"/lspci \
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|| echo "lspci not available! Please install pciutils. "
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# Loaded kernel modules & USB devices:
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case $OS in
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Linux)
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lsmod >"$DIR"/lsmod
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which lsusb >/dev/null \
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&& lsusb >"$DIR"/lsusb \
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|| echo "lsusb not available! Please install usbutils. "
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;;
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DragonFly)
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kldstat >"$DIR"/kldstat
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which usbstats >/dev/null \
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&& usbstats >"$DIR"/usbstats \
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|| echo "usbstats not available! Please install usbutil. "
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;;
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esac
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echo "OK."
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FILE="${DIR}.tar.gz"
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DIR=`basename "$DIR"`
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tar -C "$TMP" -czf "$FILE" "$DIR"
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echo "Archive \"$FILE\" created."
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rm -fr "$TMP/$DIR"
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echo
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echo "You can now shut down the interface $IFACE if you want:"
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echo " ifconfig $IFACE down"
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