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#!/bin/bash
## Poor man's password generator.
#
# Requires:
# xclip (optional): copies password to clipboard
# qrencode (optional): generate QR code of the password
#
# TODO:
# Override clipboard after a configurable amount of time (https://git.zx2c4.com/password-store/tree/src/password-store.sh#n173)
NC='\033[0m'
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
msg_info() {
echo -e "${GREEN}$1${NC}"
}
msg_warn() {
echo -e "${YELLOW}$1${NC}"
}
msg_error() {
echo -e "${RED}$1${NC}"
}
print_help() {
echo
echo "genpass - a poor man's password generator"
echo
echo "USAGE:"
echo " genpass [OPTION ...]"
echo
echo "where OPTIONs are:"
echo " -c | --clipboard:"
echo " copy the generated password to clipboard (needs xclip)"
echo " -f | --filter <filter>:"
echo " specify a custom filter for the password (see specification"
echo " for SETs in 'tr' man page). Defaults to 'A-Za-z0-9_'."
echo " -h | -h | --help:"
echo " print this help message"
echo " -l | --length <num>:"
echo " provide password length (defaults to 32)"
echo " -q | --qrcode:"
echo " generate a qrcode of the password (needs qrencode) and"
echo " print it to stdout (UTF8 format)"
echo
}
CLIPBOARD=0
QRCODE=0
LENGTH=32
FILTER=A-Za-z0-9_
while [ $# != 0 ]
do
arg=$1
case "$arg" in
-c|--clipboard)
CLIPBOARD=1
;;
-f|--filter)
if [[ $# -ge 2 ]]; then
FILTER=$2
shift
else
msg_error "No value found for flag $arg!"
print_help
exit 1
fi
;;
-h|--help)
print_help
exit 0
;;
-l|--length)
if [[ $# -ge 2 ]]; then
LENGTH=$2
shift
else
msg_error "No value found for flag $arg!"
print_help
exit 2
fi
;;
-q|--qrcode)
QRCODE=1
;;
*)
msg_error "$1: invalid option"
print_help
exit 3
;;
esac
shift
done
PASSWD="$(tr -dc $FILTER < /dev/urandom | head -c $LENGTH)"
if [ $CLIPBOARD -eq 1 ]; then
echo -nE "$PASSWD" | xclip -in -selection clipboard
elif [ $QRCODE -eq 1 ]; then
echo -nE "$PASSWD" | qrencode --size=5 --type=UTF8 -o -
else
echo -E "$PASSWD"
fi
exit 0
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