#!/bin/sh
# log service to trace failed ssh/luci logins and conditionally refresh banIP
# written by Dirk Brenken (dev@brenken.org)

# This is free software, licensed under the GNU General Public License v3.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

LC_ALL=C
PATH="/usr/sbin:/usr/bin:/sbin:/bin"
ban_ver="${1}"
ban_sshdaemon="${2}"
ban_logger="$(command -v logger)"
ban_logread="$(command -v logread)"

f_log()
{
	local class="${1}" log_msg="${2}"

	if [ -x "${ban_logger}" ]
	then
		"${ban_logger}" -p "${class}" -t "banIP-${ban_ver}[${$}]" "${log_msg}"
	else
		printf "%s %s %s\\n" "${class}" "banIP-${ban_ver}[${$}]" "${log_msg}"
	fi
}

if [ -x "${ban_logread}" ]
then
	f_log "info" "log/banIP service started"
	"${ban_logread}" -f -e "${ban_sshdaemon}\|luci: failed login" | \
		{ grep -qE "Exit before auth|luci: failed login|[0-9]+ \[preauth\]$"; [ $? -eq 0 ] && /etc/init.d/banip refresh; }
else
	f_log "err" "can't start log/banIP service"
fi