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118 lines
5.3 KiB
118 lines
5.3 KiB
#!/bin/sh
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# vpn switch for travelmate
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# Copyright (c) 2020-2021 Dirk Brenken (dev@brenken.org)
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# This is free software, licensed under the GNU General Public License v3.
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# set (s)hellcheck exceptions
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# shellcheck disable=1091,3040,3043
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# Please note: you have to setup the package 'wireguard' or 'openvpn' before using this script
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export LC_ALL=C
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export PATH="/usr/sbin:/usr/bin:/sbin:/bin"
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set -o pipefail
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# source function library if necessary
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#
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if [ -z "${_C}" ]; then
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. "/lib/functions.sh"
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fi
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vpn_action="${1}"
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trm_vpnservice="$(uci_get travelmate global trm_vpnservice)"
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trm_vpniface="$(uci_get travelmate global trm_vpniface)"
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trm_landevice="$(uci_get travelmate global trm_landevice)"
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trm_maxwait="$(uci_get travelmate global trm_maxwait "30")"
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trm_captiveurl="$(uci_get travelmate global trm_captiveurl "http://detectportal.firefox.com")"
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trm_useragent="$(uci_get travelmate global trm_useragent "Mozilla/5.0 (Linux x86_64; rv:90.0) Gecko/20100101 Firefox/90.0")"
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trm_iptrule_accept="FORWARD -i ${trm_landevice} -p tcp --match multiport --dports 80,443 -j ACCEPT"
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trm_iptrule_drop="FORWARD -i ${trm_landevice} -j DROP"
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trm_iptables="$(command -v iptables)"
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trm_logger="$(command -v logger)"
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trm_fetch="$(command -v curl)"
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f_net()
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{
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local IFS json_rc result="net nok"
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json_rc="$(${trm_fetch} --user-agent "${trm_useragent}" --referer "http://www.example.com" --connect-timeout $((trm_maxwait / 10)) --header "Cache-Control: no-cache, no-store, must-revalidate" --header "Pragma: no-cache" --header "Expires: 0" --write-out "%{response_code}" --silent --show-error --output /dev/null "${trm_captiveurl}")"
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if [ "${json_rc}" = "200" ] || [ "${json_rc}" = "204" ]; then
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result="net ok"
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fi
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printf "%s" "${result}"
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}
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if [ -n "${trm_vpnservice}" ] && [ -n "${trm_vpniface}" ] && [ -n "${trm_landevice}" ] && [ -f "/tmp/trm_runtime.json" ]; then
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status="$(jsonfilter -i "/tmp/trm_runtime.json" -l1 -e '@.data.travelmate_status' 2>/dev/null)"
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vpn_status="$(ubus -S call network.interface."${trm_vpniface}" status 2>/dev/null | jsonfilter -l1 -e '@.up')"
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if [ "${vpn_action}" = "disable" ] && [ "${vpn_status}" = "true" ]; then
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if [ -n "$("${trm_iptables}" "-w $((trm_maxwait / 6))" -C "${trm_iptrule_drop}" 2>&1)" ] &&
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[ -n "$("${trm_iptables}" "-w $((trm_maxwait / 6))" -C "${trm_iptrule_accept}" 2>&1)" ]; then
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"${trm_iptables}" "-w $((trm_maxwait / 6))" -I "${trm_iptrule_drop}" 2>&1
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"${trm_logger}" -p "info" -t "trm-vpn [${$}]" "lan forward blocked for device '${trm_landevice}'" 2>/dev/null
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fi
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fi
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if [ "${vpn_action}" = "disable" ] && [ "${status%% (net cp *}" = "connected" ]; then
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if [ -n "$("${trm_iptables}" "-w $((trm_maxwait / 6))" -C "${trm_iptrule_accept}" 2>&1)" ] &&
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[ -z "$("${trm_iptables}" "-w $((trm_maxwait / 6))" -C "${trm_iptrule_drop}" 2>&1)" ]; then
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"${trm_iptables}" "-w $((trm_maxwait / 6))" -I "${trm_iptrule_accept}" 2>&1
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"${trm_logger}" -p "info" -t "trm-vpn [${$}]" "lan forward on ports 80/443 freed for device '${trm_landevice}'" 2>/dev/null
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fi
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fi
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case "${trm_vpnservice}" in
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"wireguard")
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if [ "${vpn_action}" = "enable" ] && [ "${vpn_status}" != "true" ]; then
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ubus call network.interface."${trm_vpniface}" up
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elif [ "${vpn_action}" = "disable" ] && [ "${vpn_status}" = "true" ]; then
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ubus call network.interface."${trm_vpniface}" down
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"${trm_logger}" -p "info" -t "trm-vpn [${$}]" "${trm_vpnservice} client connection disabled" 2>/dev/null
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fi
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;;
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"openvpn")
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if [ "${vpn_action}" = "enable" ] && [ "${vpn_status}" != "true" ]; then
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ubus call network.interface."${trm_vpniface}" up
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/etc/init.d/openvpn restart >/dev/null 2>&1
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elif [ "${vpn_action}" = "disable" ] && [ "${vpn_status}" = "true" ]; then
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ubus call network.interface."${trm_vpniface}" down
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/etc/init.d/openvpn stop >/dev/null 2>&1
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"${trm_logger}" -p "info" -t "trm-vpn [${$}]" "${trm_vpnservice} client connection disabled" 2>/dev/null
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fi
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;;
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esac
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if [ "${vpn_action}" = "enable" ] && [ "${vpn_status}" != "true" ]; then
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cnt=0
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while true; do
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vpn_status="$(ubus -S call network.interface."${trm_vpniface}" status 2>/dev/null | jsonfilter -l1 -e '@.up')"
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if [ "${vpn_status}" = "true" ]; then
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net_status="$(f_net)"
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if [ "${net_status}" = "net ok" ]; then
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"${trm_logger}" -p "info" -t "trm-vpn [${$}]" "${trm_vpnservice} client connection enabled" 2>/dev/null
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if [ -z "$("${trm_iptables}" "-w $((trm_maxwait / 6))" -C "${trm_iptrule_drop}" 2>&1)" ]; then
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"${trm_iptables}" "-w $((trm_maxwait / 6))" -D "${trm_iptrule_drop}" 2>&1
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if [ -z "$("${trm_iptables}" "-w $((trm_maxwait / 6))" -C "${trm_iptrule_accept}" 2>&1)" ]; then
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"${trm_iptables}" "-w $((trm_maxwait / 6))" -D "${trm_iptrule_accept}" 2>&1
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fi
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"${trm_logger}" -p "info" -t "trm-vpn [${$}]" "lan forward freed for device '${trm_landevice}'" 2>/dev/null
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fi
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break
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fi
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fi
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if [ "${cnt}" -ge "$((trm_maxwait / 6))" ]; then
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"${trm_logger}" -p "info" -t "trm-vpn [${$}]" "${trm_vpnservice} restart failed, lan forward for device '${trm_landevice}' still blocked" 2>/dev/null
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ubus call network.interface."${trm_vpniface}" down
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exit 2
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fi
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sleep 1
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cnt="$((cnt + 1))"
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done
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fi
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if [ "${vpn_action}" = "enable" ] && [ "${vpn_status}" = "true" ]; then
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if [ -f "/etc/init.d/sysntpd" ]; then
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/etc/init.d/sysntpd restart >/dev/null 2>&1
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fi
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fi
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exit 0
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fi
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exit 1
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