getdomainnames.sh

#!/bin/sh
#_______________________________________________________________________________________________________________
#
# This script will format the output stored in 'myfile' created using the command: tail -f dnsmasq.log > myfile
# and save the output to myfile_domains. The file name 'myfile' is an example. You can enter any name.
#
# Usage Instructions:
#  1. Navigate to the log file directory /opt/var/log
#  2. Enter the command: tail -f dnsmasq.log > myfile
#  3. Access the streaming service and watch some videos for a few seconds and select each option to generate
#     domain names.
#  4. Type 'Ctrl-C' to exit
#  5. Navigate to /jffs/scripts
#  6. Run getdomainnames.sh
#  7. The domains collected will be stored in /opt/var/log/ directory using the same name as the output file
#     with '_domains' concatenated at the end of the file name (e.g myfile_domains)
#
# Parameters Passed
# $1 = provide the name of the source file when running the script
# $2 = IPv4 address of client device that was used to query domains
# Usage Example:
#   sh getdomainnames.sh myfile 192.168.1.50
#_______________________________________________________________________________________________________________

# Print between line beginning with '#_' to first blank line inclusive
ShowHelp() {
  awk '/^#__/{f=1} f{print; if (!NF) exit}' "$0" | more
}

# Need assistance!???
if [ "$1" = "help" ] || [ "$1" = "-h" ]; then
  ShowHelp
  exit 0
fi

[ -z "$1" ] && echo "Error! Missing parameter 1" && exit 1
[ -z "$2" ] && echo "Error! Missing parameter 2" && exit 1

SOURCE_FILE="/opt/var/log/$1"
IPv4="$2"

A=$(echo "$IPv4" | grep -oE "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$")

if [ -z "$A" ]; then
  printf 'Error! "%s" is not a valid IPv4 address\n' "$IPv4"
  exit 1
fi

if [ -s "$SOURCE_FILE" ]; then
  OUTPUT_FILE="${SOURCE_FILE}_domains"
  true >"$OUTPUT_FILE"
  grep "$IPv4" "$SOURCE_FILE" | grep "query" | awk '{ print $6 }' | sort -u >>"$OUTPUT_FILE"
else
  echo "Error! $SOURCE_FILE does not exist"
fi