#!/bin/bash

E_OPTERROR=65

TIMESTAMP="`date +"%s"`"
MailReport=0
MailTo="${USER}@$(domainname -d)"
MailFrom="${USER}@$(domainname -d)"
TMPLOG=/tmp/.glsa-check-${TIMESTAMP}.${PPID}
TMPDATA=/tmp/.glsa-check-data-${TIMESTAMP}.${PPID}

trap 'rm -f "${TMPLOG}" "${TMPDATA}"; exit;' TERM INT EXIT HUP KILL

function usage() {

    echo "Usage: `basename $0` [-h] [-m [-t <to email>] [-f <from email>]]"
        echo "       -m:  Mail Report (automatically turned on if -t or -f are used)"
        echo "       -t:  Email address to mail report to (default: ${USER}@$(domainname -d))"
        echo "       -f:  Email address to use as the From address (default: ${USER}@$(domainname -d))"
        echo "       -h:  This help stuff :-)"
}

function generateReport() {

    local counter advisory

    /usr/bin/glsa-check --nocolor --list 2>&1 | grep -E '^[0-9-]+ \[N' > "${TMPDATA}"

    if [ -z "$(cat ${TMPDATA} | tr -d "\n\r ")" ]; then
        exit;
    else
        total=$(cat ${TMPDATA} | wc -l)
        {
            counter=0;
            echo "Current Relevant Security Advisories:";
            echo "-------------------------------------";
            echo
            echo "Summary:";
            echo "--------";
            echo

            while read line; do
                advisory="$(echo $line | perl -pi -e 's/^([0-9-]+)[^\]]+\] ([^(]+).*/(GLSA \1) \2/g')";
                counter=$(($counter + 1));

                echo "${counter}  -  ${advisory}";
            done < "${TMPDATA}"

                echo
            echo "Full text listing:";
            echo "------------------";
                    echo

            counter=0;
            for advisory in $(cat "${TMPDATA}" | perl -pi -e 's/^([0-9-]+).*\n/\1 /g'); do
                counter=$(($counter + 1));
                echo -en "${counter} - ";
                /usr/bin/glsa-check --dump $advisory 2>/dev/null
            done
        } > "${TMPLOG}"

        if [ ${MailReport} -eq 1 ]; then
            mail "${MailTo}" -a "From: ${MailFrom}" -s "$(uname -n) Security Advisories (${total} package(s))" < "${TMPLOG}"
        else
            cat "${TMPLOG}"
        fi
    fi
}

while getopts "hmt:f:" Option
do
  case $Option in
    m ) MailReport=1;;
    t ) {
            MailTo="${OPTARG}"
            MailReport=1
            if [ -z "${MailTo}" -o $(echo "${MailTo}" | grep -cP '^[A-Za-z0-9_.+-]+@([a-zA-Z0-9-]+\.)+[a-zA-Z0-9]+') -le 0 ]; then
                echo
                echo "Invalid (-t) Mail To address '${MailTo}' !!";
                echo
                usage;
                exit $E_OPTERROR;
            fi
        };;
    f ) {
            MailReport=1
            MailFrom="${OPTARG}"
            if [ -z "${MailFrom}" -o $(echo "${MailFrom}" | grep -cP '^[A-Za-z0-9_.+-]+@([a-zA-Z0-9-]+\.)+[a-zA-Z0-9]+') -le 0 ]; then
                echo
                echo "Invalid (-f) Mail From address '${MailFrom}' !!";
                echo
                usage;
                exit $E_OPTERROR;
            fi
        };;
    h | *) usage;
        exit 1;;
  esac
done

shift $(($OPTIND - 1))

generateReport

exit 0;

5 0 * * *  /usr/local/bin/glsa.sh -t noc@somewhere.com -f glsa@somewhere.com