#! /usr/bin/env bash
#
# Usage:
#   send-mail subject [destination] < txt
#
# subject:  subject line for the email message.
# destination:  recipient email address (optional).
#
# Sends stdin per mail to recipients, adding some common headers/footers

. `dirname $0`/zeekctl-config.sh
if [ $? -ne 0 ]; then
    exit 1
fi

if [ -z "${sendmail}" ]; then
    # If the "sendmail" config option has no value, then don't try to send mail
    # (this is not an error).
    exit 0
fi

if [ ! -f "${sendmail}" ]; then
    echo "send-mail: ${sendmail} not found"
    exit 1
fi

if [ $# -lt 1 ] || [ $# -gt 2 ]; then
    echo "send-mail: wrong usage"
    exit 1
fi

if [ $# -eq 2 ]; then
    to=$2
else
    to=${mailto}
fi

if [ -z "$to" ]; then
    echo "send-mail: no recipients"
    exit 1
fi

from=${mailfrom}
subject="${mailsubjectprefix} $1"

if [ ! -d "${tmpdir}" ]; then
    echo "send-mail: directory not found: ${tmpdir}"
    exit 1
fi

tmp=${tmpdir}/mail.$$.tmp

rm -f "$tmp"
if [ $? -ne 0 ]; then
    exit 1
fi

# Verify that we have write access to the directory
touch "$tmp"
if [ $? -ne 0 ]; then
    exit 1
fi

cat >>"$tmp" <<_EOF_
From: $from
Subject: $subject
To: $to
User-Agent: ZeekControl ${version}
_EOF_

if [ -n "${mailreplyto}" ]; then
    echo Reply-To: ${mailreplyto} >>"$tmp"
fi

echo >>"$tmp"

cat >>"$tmp"

cat >>"$tmp" <<EOF

--
[Automatically generated.]

EOF

${sendmail} -t -oi <"$tmp" && rm -f "$tmp"