Log ESSIDs

log_essids.sh

#!/bin/sh -e

_WLAN=$1
_DATE=$(date +%Y%m%d)
_STAMP=$(date +%s)

_LOG_DIR=/var/log/essids
_TMP=/tmp/essids.tmp
_LOG=$_LOG_DIR/$_DATE/$_STAMP.log

_OPEN=$_LOG_DIR/$_DATE/$_STAMP-open.log
_CLOSED=$_LOG_DIR/$_DATE/$_STAMP-closed.log

_CLOSED_ALL=$_LOG_DIR/closed.log
_OPEN_ALL=$_LOG_DIR/open.log
_ALL=$_LOG_DIR/all.log

mkdir -p "$_LOG_DIR"/"$_DATE"

if [ $# -eq 0 ]
  then
   _WLAN=wlan0
fi

strip_logs() {
	grep -B4 "Encryption key:$1" "$_TMP" | \
		awk -F 'ESSID:"' '{print $2}' | \
		sed -e '/^\s*$/d' -e 's/"$//' > "$2"

	cat "$2" >> "$3"
	sort -u "$3" -o "$3"
	sed -i -e '/<hidden>/d' "$3"
}

/sbin/iwlist "$_WLAN" scan > "$_TMP"
strip_logs 'on' "$_CLOSED" "$_CLOSED_ALL"
strip_logs 'off' "$_OPEN" "$_OPEN_ALL"

sort "$_OPEN" "$_CLOSED" -o "$_LOG"
sort "$_OPEN_ALL" "$_CLOSED_ALL" -o "$_ALL"