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chapter14/mk_swkey.ksh

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+#!/usr/bin/ksh
+#
+# SCRIPT: mk_swkey.ksh
+# AUTHOR: Randy Michael
+# DATE: 07/07/2007
+# REV: 1.2.P
+#
+# PURPOSE: This script is used to create a software
+#          license key based on the IP address of the 
+#          system that this shell script is executed on.
+#          The system is queried for the system's IP
+#          address. The IP address is striped of the
+#          dots (.) and each number is converted to 
+#          hexadecimal. Then each hex string is combined 
+#          into a single hex string, which is the software
+#          license key.
+#
+# REV LIST:
+#
+#
+# set -x # Uncomment to debug this script
+# set -n # Uncomment to check command syntax without any execution
+#
+#################################################
+# DEFINE FILES AND VARIABLES HERE
+#################################################
+
+# Set up the correct echo command usage. Many Linux
+# distributions will execute in Bash even if the
+# script specifies Korn shell. Bash shell requires
+# we use echo -e when we use \n, \c, etc.
+
+case $SHELL in
+*/bin/bash) alias echo="echo -e"
+            echo -e "\nWARNING: This script is executing in Bash shell."
+            echo "This script may fail because of an unsupported typeset"
+            echo -e "command option that is only supported in Korn shell\n"
+            ;;
+esac
+
+# Set up the correct awk usage. Solaris needs to
+# use nawk instead of awk.
+
+case $(uname) in
+SunOS) alias awk="nawk"
+       ;;
+esac
+
+#################################################
+# DEFINE FUNCTIONS HERE
+#################################################
+
+function convert_base_10_to_16
+{
+# set -x # Uncomment to debug this function
+
+typeset -i16 BASE_16_NUM
+
+BASE_10_NUM=$1
+
+BASE_16_NUM=$((10#${BASE_10_NUM}))
+
+# Strip the number base prefix from the hexadecimal
+# number. This prefix is not needed here.
+
+echo $BASE_16_NUM | grep -q '#'
+if (($? == 0))
+then
+        echo $BASE_16_NUM | awk -F '#' '{print $2}'
+else
+        echo $BASE_16_NUM
+fi
+}
+
+#############################################################
+# BEGINNING OF MAIN 
+#############################################################
+
+# Query the system for the IP address using the "host $(hostname)"
+# command substitution.
+
+IP=$(host $(hostname) | awk '{print $3}' | awk -F ',' '{print $1}')
+
+# Field delimit the IP address on the dots (.) and assign each
+# number to a separate variable in a "while read" loop.
+
+echo $IP | awk -F '.' '{print $1, $2, $3, $4}' | while read a b c d junk
+do
+     # Convert each of the numbers in the IP address
+     # into hexadecimal by calling the "convert_base_10_to16"
+     # function.
+
+     FIRST=$(convert_base_10_to_16 $a)
+     SECOND=$(convert_base_10_to_16 $b)
+     THIRD=$(convert_base_10_to_16 $c)
+     FORTH=$(convert_base_10_to_16 $d)
+done
+
+# Combine all of the hexadecimal strings into a single
+# hexadecimal string, which represents the software key.
+
+echo "${FIRST}${SECOND}${THIRD}${FORTH}"
+