hex2bin is an utility to convert a string in hexadecimal format like
"2b2b2b415448300d" (an example to test a stupid modem vulnerability)
in the binary equivalent. For example:
# echo -n "2b2b2b415448300d" | ./hex2bin > modem.string
# cat modem.string
+++ATH0
# ls -l modem.string
-rw-r--r-- 1 antirez users 8 Nov 17 16:01 modem.string
# hping2 --file ./modem.string -d 8 --icmp target.host.org
using switch '-r' hex2bin perform exactly the inverse operation.
for example:
echo "antirez" | ./hex2bin -r
616e746972657a0a
