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#!/bin/sh /etc/rc.common
# Copyright 2017-2020 Stan Grishin (stangri@melmac.net)
# shellcheck disable=SC2039,SC1091,SC2086
PKG_VERSION='dev-test'
# shellcheck disable=SC2034
START=94
# shellcheck disable=SC2034
USE_PROCD=1
# shellcheck disable=SC2034
extra_command "version" "Print version information"
version() { echo "$PKG_VERSION"; }
readonly __ERROR__='\033[0;31mERROR\033[0m'
# shellcheck disable=SC2034
serviceEnabled=0
verbosity=2
TID='200'
IPSET='vpnbypass'
FW_MARK='0x010000'
FW_MASK='0xff0000'
wan_if4=''
wan_gw=''
readonly packageName='vpnbypass'
readonly serviceName="$packageName $PKG_VERSION"
readonly sharedMemoryOutput="/dev/shm/$packageName-output"
output() {
# Can take a single parameter (text) to be output at any verbosity
# Or target verbosity level and text to be output at specifc verbosity
local msg memmsg logmsg
if [ $# -ne 1 ]; then
if [ $((verbosity & $1)) -gt 0 ] || [ "$verbosity" = "$1" ]; then shift; else return 0; fi
fi
[ -t 1 ] && printf "%b" "$1"
msg="${1//$serviceName /service }";
if [ "$(printf "%b" "$msg" | wc -l)" -gt 0 ]; then
[ -s "$sharedMemoryOutput" ] && memmsg="$(cat "$sharedMemoryOutput")"
logmsg="$(printf "%b" "${memmsg}${msg}" | sed 's/\x1b\[[0-9;]*m//g')"
logger -t "${packageName:-service} [$$]" "$(printf "%b" "$logmsg")"
rm -f "$sharedMemoryOutput"
else
printf "%b" "$msg" >> "$sharedMemoryOutput"
fi
}
load_package_config() {
config_load "$packageName"
config_get_bool serviceEnabled 'config' 'enabled' 1
config_get verbosity 'config' 'verbosity' '2'
if [ -z "${verbosity##*[!0-9]*}" ] || [ "$verbosity" -lt 0 ] || [ "$verbosity" -gt 2 ]; then
verbosity=1
fi
. /lib/functions/network.sh
}
is_enabled() {
local sleepCount=1
load_package_config
while : ; do
network_find_wan wan_if4
[ "$serviceEnabled" -gt 0 ] || return 1
[ -n "$wan_if4" ] && network_get_gateway wan_gw "$wan_if4"
if [ $sleepCount -ge 25 ] || [ -n "$wan_gw" ]; then break; fi
output "$serviceName waiting for wan gateway...\\n"
sleep 2; network_flush_cache; let "sleepCount+=1";
done
[ -n "$wan_gw" ] && return 0
output "$__ERROR__: $serviceName failed to discover WAN gateway.\\n"; return 1;
}
is_ovpn() { local dev; dev=$(uci -q get network."$1".ifname); if [ "${dev:0:3}" = "tun" ] || [ "${dev:0:3}" = "tap" ] || [ -f "/sys/devices/virtual/net/${dev}/tun_flags" ]; then return 0; else return 1; fi; }
is_wan() { if [ -n "$wan_if4" ] && [ "$1" = "$wan_if4" ]; then return 0; else return 1; fi; }
is_supported_interface() { if is_wan "$1" || is_ovpn "$1"; then return 0; else return 1; fi; }
ipt() {
local d;
d="${*//-A/-D}"; [ "$d" != "$*" ] && iptables $d >/dev/null 2>&1
d="${*//-I/-D}"; [ "$d" != "$*" ] && iptables $d >/dev/null 2>&1
d="${*//-N/-F}"; [ "$d" != "$*" ] && iptables $d >/dev/null 2>&1
d="${*//-N/-X}"; [ "$d" != "$*" ] && iptables $d >/dev/null 2>&1
d="$*"; iptables $d >/dev/null 2>&1 || output "\\n$__ERROR__: iptables $d\\n"
}
start_service() {
local ll lports rports routes ranges
is_enabled || return 1
config_get lports 'config' 'localport'
config_get rports 'config' 'remoteport'
config_get routes 'config' 'remotesubnet'
config_get ranges 'config' 'localsubnet'
procd_open_instance "main"
procd_set_param command /bin/true
procd_set_param stdout 1
procd_set_param stderr 1
procd_close_instance
ipt -t mangle -D PREROUTING -m mark --mark 0x00/${FW_MASK} -g VPNBYPASS >/dev/null 2>&1
{ ipt -t mangle -N VPNBYPASS; ipt -t mangle -A PREROUTING -m mark --mark 0x00/${FW_MASK} -g VPNBYPASS; } >/dev/null 2>&1
ipt -t mangle -A VPNBYPASS -m set --match-set $IPSET dst -j MARK --set-mark ${FW_MARK}/${FW_MASK} >/dev/null 2>&1
ip rule del fwmark "$FW_MARK" table "$TID" >/dev/null 2>&1;
ipset -q flush "$IPSET"; ipset -q destroy "$IPSET";
ip route flush table "$TID"; ip route flush cache;
ip route add default via "$wan_gw" table "$TID"; ip route flush cache;
ipset -q -exist create "$IPSET" hash:ip; ipset -q flush "$IPSET"
ip rule add fwmark "$FW_MARK" table "$TID"
{ modprobe xt_set; modprobe ip_set; modprobe ip_set_hash_ip; } >/dev/null 2>&1
for ll in ${ranges}; do ipt -t mangle -I VPNBYPASS 1 -j MARK --set-mark ${FW_MARK}/${FW_MASK} -s "$ll"; done
for ll in ${lports}; do ipt -t mangle -I VPNBYPASS 1 -j MARK --set-mark ${FW_MARK}/${FW_MASK} -p tcp -m multiport --sport "${ll//-/:}"; done
for ll in ${routes}; do ipt -t mangle -I VPNBYPASS 1 -j MARK --set-mark ${FW_MARK}/${FW_MASK} -d "$ll"; done
for ll in ${rports}; do ipt -t mangle -I VPNBYPASS 1 -j MARK --set-mark ${FW_MARK}/${FW_MASK} -p tcp -m multiport --dport "${ll//-/:}"; done
output "$serviceName started with TID: $TID; FW_MARK: $FW_MARK\\n"
}
stop_service() {
load_package_config
ip rule del fwmark "$FW_MARK" table "$TID" >/dev/null 2>&1;
ipset -q flush "$IPSET"; ipset -q destroy "$IPSET";
ip route flush table "$TID"; ip route flush cache;
ipt -t mangle -D PREROUTING -m mark --mark 0x00/${FW_MASK} -g VPNBYPASS >/dev/null 2>&1
{ ipt -t mangle -F VPNBYPASS; ipt -t mangle -X VPNBYPASS; } >/dev/null 2>&1
output "$serviceName stopped\\n"
}
service_triggers_load_interface() { is_supported_interface "$1" && ifaces="${ifaces}${1} "; }
service_triggers() {
local ifaces n
config_load network; config_foreach service_triggers_load_interface 'interface';
procd_add_reload_trigger 'firewall' 'openvpn' 'vpnbypass'
procd_open_trigger
for n in $ifaces; do procd_add_reload_interface_trigger "$n"; procd_add_interface_trigger "interface.*" "$n" /etc/init.d/vpnbypass reload; done;
output "$serviceName monitoring interfaces: $ifaces\\n"
procd_close_trigger
}