/usr/share/doc/netcat-openbsd/examples/bsh is in netcat-openbsd 1.105-7ubuntu1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | #! /bin/sh
## a little wrapper to "password" and re-launch a shell-listener.
## Arg is taken as the port to listen on. Define "NC" to point wherever.
NC=nc
case "$1" in
?* )
LPN="$1"
export LPN
sleep 1
echo "-l -p $LPN -e $0" | $NC > /dev/null 2>&1 &
echo "launched on port $LPN"
exit 0
;;
esac
# here we play inetd
echo "-l -p $LPN -e $0" | $NC > /dev/null 2>&1 &
while read qq ; do
case "$qq" in
# here's yer password
gimme )
cd /
exec csh -i
;;
esac
done
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