#!/bin/sh
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
# 
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
# 
# * Neither the name of the copyright holder nor the names of its
#   contributors may be used to endorse or promote products derived from
#   this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

. /usr/local/share/bastille/colors.pre.sh
. /usr/local/etc/bastille/bastille.conf

usage() {
    echo -e "${COLOR_RED}Usage: bastille rdr TARGET [clear] | [list] | [tcp <host_port> <jail_port>] | [udp <host_port> <jail_port>]${COLOR_RESET}"
    exit 1
}

# Handle special-case commands first.
case "$1" in
help|-h|--help)
    usage
    ;;
esac

if [ $# -lt 2 ]; then
    usage
fi

TARGET="${1}"
shift

# Can only redirect to single jail
if [ "${TARGET}" = 'ALL' ]; then
    echo -e "${COLOR_RED}Can only redirect to single jail${COLOR_RESET}"
    exit 1
fi

# Check jail name valid
JAIL_NAME=$(jls -j "${TARGET}" name 2>/dev/null)
if [ -z "${JAIL_NAME}" ]; then
    echo -e "${COLOR_RED}Jail not found: ${TARGET}${COLOR_RESET}"
    exit 1
fi

# Check jail ip4 address valid
JAIL_IP=$(jls -j "${TARGET}" ip4.addr 2>/dev/null)
if [ -z "${JAIL_IP}" -o "${JAIL_IP}" = "-" ]; then
    echo -e "${COLOR_RED}Jail IP not found: ${TARGET}${COLOR_RESET}"
    exit 1
fi

# Check rdr-anchor is setup in pf.conf
if !(pfctl -sn | grep rdr-anchor | grep 'rdr/\*' >/dev/null); then
    echo -e "${COLOR_RED}rdr-anchor not found in pf.conf${COLOR_RESET}"
    exit 1
fi

# Check ext_if is setup in pf.conf
EXT_IF=$(grep '^[[:space:]]*ext_if[[:space:]]*=' /etc/pf.conf)
if [ -z "${JAIL_NAME}" ]; then
    echo -e "${COLOR_RED}ext_if not defined in pf.conf${COLOR_RESET}"
    exit 1
fi

while [ $# -gt 0 ]; do
    case "$1" in
        list)
            pfctl -a "rdr/${JAIL_NAME}" -Psn 2>/dev/null
            shift
            ;;
        clear)
            pfctl -a "rdr/${JAIL_NAME}" -Fn
            shift
            ;;
        tcp)
            if [ $# -lt 3 ]; then
                usage
            fi
            ( pfctl -a "rdr/${JAIL_NAME}" -Psn; 
              printf '%s\nrdr on $ext_if inet proto tcp to port %d -> %s port %d\n' "$EXT_IF" "$2" "$JAIL_IP" "$3" ) \
                  | pfctl -a "rdr/${JAIL_NAME}" -f-
            shift 3
            ;;
        udp)
            if [ $# -lt 3 ]; then
                usage
            fi
            ( pfctl -a "rdr/${JAIL_NAME}" -Psn; 
              printf '%s\nrdr on $ext_if inet proto udp to port %d -> %s port %d\n' "$EXT_IF" "$2" "$JAIL_IP" "$3" ) \
                  | pfctl -a "rdr/${JAIL_NAME}" -f-
            shift 3
            ;;
        *)
            usage
            ;;
    esac
done