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@ -52,7 +52,7 @@ CHANNEL=1
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# Displays the message in argument on the error output and exits
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error()
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{
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echo "$1" >&2
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printf '%s\n' "$1" >&2
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clean
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exit 1
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}
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@ -66,7 +66,7 @@ clean()
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# Verifies the presence of the needed programs
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check_dependencies()
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{
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which tcpdump >/dev/null \
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command -v tcpdump >/dev/null \
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|| error "tcpdump is required to run this program!"
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if [ "$OS" = Linux ] ; then
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@ -80,25 +80,25 @@ check_dependencies()
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iface_set_channel()
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{
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echo "Setting interface $IFACE on channel $1..."
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case $OS in
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case "$OS" in
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Linux)
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iface_down
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iwconfig $IFACE mode managed
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iwconfig "$IFACE" mode managed
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iface_up
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iwconfig $IFACE channel $1
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iwconfig "$IFACE" channel "$1"
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;;
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NetBSD | OpenBSD)
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iface_down
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ifconfig $IFACE media autoselect chan $1
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ifconfig "$IFACE" media autoselect chan "$1"
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iface_up
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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 "Channel set." \
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|| error "Cannot set the channel!"
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echo "Channel set."
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iface_monitor
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}
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@ -107,54 +107,56 @@ iface_monitor()
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{
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iface_down
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echo -n "Switching interface $IFACE to monitor mode... "
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case $OS in
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printf 'Switching interface %s to monitor mode... ' "$IFACE"
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case "$OS" in
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Linux)
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iwconfig $IFACE mode monitor
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iwconfig "$IFACE" mode monitor
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;;
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NetBSD | OpenBSD)
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ifconfig $IFACE media autoselect mediaopt monitor
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ifconfig "$IFACE" media autoselect mediaopt monitor
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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 "OK." \
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|| error "Cannot switch the interface to monitor mode!"
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echo "OK."
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iface_up
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}
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# Shuts down the capture interface
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iface_down()
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{
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echo -n "Shuting down interface $IFACE... "
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ifconfig $IFACE down && echo "OK." \
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printf 'Shuting down interface %s... ' "$IFACE"
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ifconfig "$IFACE" down \
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|| error "Cannot shut down the interface!"
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echo "OK."
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}
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# Turns on the capture interface
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iface_up()
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{
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echo -n "Turning up interface $IFACE... "
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ifconfig $IFACE up && echo "OK." \
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printf 'Turning up interface %s... ' "$IFACE"
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ifconfig "$IFACE" up \
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|| error "Cannot turn the interface up!"
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echo "OK."
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}
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# Invokes tcpdump and displays the number of packets captured
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invoke_tcpdump()
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{
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NCAP=$(tcpdump -i $IFACE -c $NB_PKT -w "$FILE" 2>&1 \
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NCAP=$(tcpdump -i "$IFACE" -c "$NB_PKT" -w "$FILE" 2>&1 \
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| sed -nr 's/([[:digit:]]+) packets received by filter$/\1/p')
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[ "$NCAP" = "" ] \
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[ -z "$NCAP" ] \
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&& error "Error parsing the tcpdump messages! (NCAP=\"$NCAP\")"
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echo $NCAP
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echo "$NCAP"
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}
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# Waits for a number of seconds, then kills any tcpdump process
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wait_tcpdump()
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{
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sleep $1
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sleep "$1"
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echo "$1 seconds passed, killing all tcpdump processes..."
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pkill tcpdump
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}
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@ -162,15 +164,15 @@ wait_tcpdump()
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# Gets some information about the running system
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gather_system_information()
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{
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echo -n "Gathering system information... "
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printf "Gathering system information... "
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# Kernel & other information:
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uname -a >"$DESTDIR"/uname-a
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# Wi-Fi interface information:
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ifconfig $IFACE >"$DESTDIR"/ifconfig_$IFACE
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[ $OS = Linux ] \
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&& iwconfig $IFACE >"$DESTDIR"/iwconfig_$IFACE
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ifconfig "$IFACE" >"$DESTDIR/ifconfig_$IFACE"
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[ "$OS" = Linux ] \
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&& iwconfig "$IFACE" >"$DESTDIR/iwconfig_$IFACE"
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# PCI devices:
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which lspci >/dev/null \
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command -v lspci >/dev/null \
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&& lspci >"$DESTDIR"/lspci \
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|| echo "lspci not available! Please install pciutils. "
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# USB devices:
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@ -183,14 +185,14 @@ gather_system_information()
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# Gets information about the plugged usb devices
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gather_usb_devices()
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{
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case $OS in
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case "$OS" in
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Linux)
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which lsusb >/dev/null \
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command -v lsusb >/dev/null \
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&& lsusb >"$DESTDIR"/lsusb \
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|| echo "lsusb not available! Please install usbutils. "
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;;
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NetBSD | OpenBSD | DragonFly)
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which usbstats >/dev/null \
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command -v usbstats >/dev/null \
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&& usbstats >"$DESTDIR"/usbstats \
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|| echo "usbstats not available! Please install usbutil. "
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;;
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@ -200,7 +202,7 @@ gather_usb_devices()
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# Gets information about the loaded kernel modules
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gather_kernel_modules()
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{
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case $OS in
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case "$OS" in
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Linux)
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lsmod >"$DESTDIR"/lsmod
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;;
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@ -217,7 +219,7 @@ gather_kernel_modules()
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create_archive()
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{
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TARBALL="${DESTDIR}.tar.gz"
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DIR=`basename "$DESTDIR"`
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DIR=$(basename "$DESTDIR")
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tar -C "$TMP" -czf "$TARBALL" "$DIR"
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echo "Archive \"$TARBALL\" created."
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}
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@ -231,14 +233,14 @@ create_archive()
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# Interface to capture from:
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IFACE=$1
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# Machine information:
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OS=`uname`
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OS_RELEASE=`uname -r`
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HOSTNAME=`uname -n`
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OS=$(uname)
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OS_RELEASE=$(uname -r)
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HOSTNAME=$(uname -n)
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# Current date:
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DATE=`date +%FT%H%M%S`
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DATE=$(date +%FT%H%M%S)
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# Temporary destination directory:
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DESTDIR=$(mktemp -d \
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"$TMP"/capture_${OS}-${OS_RELEASE}_${IFACE}_${HOSTNAME}_${DATE}_XXX)
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"$TMP/capture_${OS}-${OS_RELEASE}_${IFACE}_${HOSTNAME}_${DATE}_XXX")
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# Update capture file with full path:
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FILE="$DESTDIR/$FILE"
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@ -246,26 +248,25 @@ check_dependencies
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echo "Trying to capture $NB_PKT packets..."
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CAPTURED=0
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while [ $CAPTURED -eq 0 -a $CHANNEL -le 14 ] ; do
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while [ "$CAPTURED" -eq 0 ] && [ "$CHANNEL" -le 14 ] ; do
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echo
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iface_set_channel $CHANNEL
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wait_tcpdump $TIMEOUT &
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iface_set_channel "$CHANNEL"
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wait_tcpdump "$TIMEOUT" &
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CAPTURED=$(invoke_tcpdump)
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[ $CAPTURED -eq 0 ] \
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[ "$CAPTURED" -eq 0 ] \
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&& echo "No packet captured on channel $CHANNEL." \
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|| echo "$CAPTURED packets captured on channel $CHANNEL."
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CHANNEL=`expr $CHANNEL + 1`
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CHANNEL=$((CHANNEL + 1))
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done
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echo
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[ $CAPTURED -gt 0 ] \
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&& echo "Capture file \"$FILE\" created." \
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[ "$CAPTURED" -gt 0 ] \
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|| error "Failed to capture any packet!"
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echo "Capture file \"$FILE\" created."
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gather_system_information
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create_archive
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clean
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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 $IFACE down"
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printf '\nYou can now shut down the interface %s if you would like:\n' "$IFACE"
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printf '\tifconfig %s down\n' "$IFACE"
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