/usr/share/doc/netcat-openbsd/examples/iscan is in netcat-openbsd 1.130-3.
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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 30 31 32 33 34 | #! /bin/sh
## duplicate DaveG's ident-scan thingie using netcat. Oooh, he'll be pissed.
## args: target port [port port port ...]
## hose stdout *and* stderr together.
##
## advantages: runs slower than ident-scan, giving remote inetd less cause
## for alarm, and only hits the few known daemon ports you specify.
## disadvantages: requires numeric-only port args, the output sleazitude,
## and won't work for r-services when coming from high source ports.
case "${2}" in
"" ) echo needs HOST and at least one PORT ; exit 1 ;;
esac
# ping 'em once and see if they *are* running identd
nc -z -w 9 "$1" 113 || { echo "oops, $1 isn't running identd" ; exit 0 ; }
# generate a randomish base port
RP=`expr $$ % 999 + 31337`
TRG="$1"
shift
while test "$1" ; do
nc -v -w 8 -p ${RP} "$TRG" ${1} < /dev/null > /dev/null &
PROC=$!
sleep 3
echo "${1},${RP}" | nc -w 4 -r "$TRG" 113 2>&1
sleep 2
# does this look like a lamer script or what...
kill -HUP $PROC
RP=`expr ${RP} + 1`
shift
done
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