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#!/bin/sh
# travelmate, a wlan connection manager for travel router
# 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/>.
# set initial defaults
#
LC_ALL=C
PATH="/usr/sbin:/usr/bin:/sbin:/bin"
trm_ver="0.9.5"
trm_sysver="$(ubus -S call system board | jsonfilter -e '@.release.description')"
trm_enabled=0
trm_debug=0
trm_automatic=1
trm_maxretry=3
trm_maxwait=30
trm_timeout=60
trm_iwinfo="$(command -v iwinfo)"
trm_radio=""
trm_rtfile="/tmp/trm_runtime.json"
# f_envload: load travelmate environment
#
f_envload()
{
# initialize lists
#
trm_devlist=""
trm_stalist=""
trm_radiolist=""
# load uci config and check 'enabled' option
#
option_cb()
{
local option="${1}"
local value="${2}"
eval "${option}=\"${value}\""
}
config_load travelmate
if [ ${trm_enabled} -ne 1 ]
then
f_log "info " "travelmate is currently disabled, please set 'trm_enabled' to '1' to use this service"
exit 0
fi
}
# f_prepare: gather radio information & bring down all STA interfaces
#
f_prepare()
{
local config="${1}"
local mode="$(uci -q get wireless."${config}".mode)"
local radio="$(uci -q get wireless."${config}".device)"
local disabled="$(uci -q get wireless."${config}".disabled)"
if ([ -z "${trm_radio}" ] || [ "${trm_radio}" = "${radio}" ]) && \
[ -z "$(printf "%s" "${trm_radiolist}" | grep -Fo " ${radio}")" ]
then
trm_radiolist="${trm_radiolist} ${radio}"
fi
if [ "${mode}" = "sta" ]
then
trm_stalist="${trm_stalist} ${config}_${radio}"
if [ -z "${disabled}" ] || [ "${disabled}" = "0" ]
then
uci -q set wireless."${config}".disabled=1
fi
fi
f_log "debug" "prepare: ${mode}, radio: ${radio}, config: ${config}, disabled: ${disabled}"
}
# f_check: check interface status
#
f_check()
{
local ifname radio status cnt=1 mode="${1}"
trm_ifstatus="false"
ubus call network reload
while [ ${cnt} -le ${trm_maxwait} ]
do
status="$(ubus -S call network.wireless status 2>/dev/null)"
if [ -n "${status}" ]
then
if [ "${mode}" = "dev" ]
then
for radio in ${trm_radiolist}
do
trm_ifstatus="$(printf "%s" "${status}" | jsonfilter -l1 -e "@.${radio}.up")"
if [ "${trm_ifstatus}" = "true" ]
then
trm_devlist="${trm_devlist} ${radio}"
else
trm_devlist=""
break
fi
done
ifname="${trm_devlist}"
else
ifname="$(printf "%s" "${status}" | jsonfilter -l1 -e '@.*.interfaces[@.config.mode="sta"].ifname')"
if [ -n "${ifname}" ]
then
trm_ifstatus="$(ubus -S call network.interface dump 2>/dev/null | jsonfilter -l1 -e "@.interface[@.device=\"${ifname}\"].up")"
fi
fi
if [ "${mode}" = "initial" ] || [ "${trm_ifstatus}" = "true" ]
then
break
fi
fi
cnt=$((cnt+1))
sleep 1
done
f_log "debug" "check: ${mode}, name: ${ifname}, status: ${trm_ifstatus}, count: ${cnt}, max-wait: ${trm_maxwait}, automatic: ${trm_automatic}"
}
# f_jsnupdate: update runtime information
#
f_jsnupdate()
{
local iface="${1}" radio="${2}" essid="${3:-"n/a"}" bssid="${4:-"n/a"}"
json_init
json_add_object "data"
json_add_string "travelmate_version" "${trm_ver}"
json_add_string "station_connection" "${trm_ifstatus}"
json_add_string "station_id" "${essid}/${bssid}"
json_add_string "station_interface" "${iface}"
json_add_string "station_radio" "${radio}"
json_add_string "last_rundate" "$(/bin/date "+%d.%m.%Y %H:%M:%S")"
json_add_string "system" "${trm_sysver}"
json_close_object
json_dump > "${trm_rtfile}"
}
# f_status: output runtime information
#
f_status()
{
local key keylist value
if [ -s "${trm_rtfile}" ]
then
printf "%s\n" "::: travelmate runtime information"
json_load "$(cat "${trm_rtfile}" 2>/dev/null)"
json_select data
json_get_keys keylist
for key in ${keylist}
do
json_get_var value "${key}"
printf " %-18s : %s\n" "${key}" "${value}"
done
fi
}
# f_log: write to syslog, exit on error
#
f_log()
{
local class="${1}"
local log_msg="${2}"
if [ -n "${log_msg}" ] && ([ "${class}" != "debug" ] || [ ${trm_debug} -eq 1 ])
then
logger -t "travelmate-[${trm_ver}] ${class}" "${log_msg}"
if [ "${class}" = "error" ]
then
logger -t "travelmate-[${trm_ver}] ${class}" "Please check 'https://github.com/openwrt/packages/blob/master/net/travelmate/files/README.md' (${trm_sysver})"
exit 255
fi
fi
}
# f_main: main function for connection handling
#
f_main()
{
local dev config raw_scan essid_list bssid_list sta_essid sta_bssid sta_radio sta_iface cnt=1
f_check "initial"
if [ "${trm_ifstatus}" != "true" ]
then
> "${trm_rtfile}"
config_load wireless
config_foreach f_prepare wifi-iface
if [ -n "$(uci -q changes wireless)" ]
then
uci -q commit wireless
fi
f_check "dev"
f_log "debug" "main: ${trm_devlist}, sta-list: ${trm_stalist}"
for dev in ${trm_devlist}
do
cnt=1
if [ -z "$(printf "%s" "${trm_stalist}" | grep -Fo "_${dev}")" ]
then
continue
fi
while [ ${trm_maxretry} -eq 0 ] || [ ${cnt} -le ${trm_maxretry} ]
do
raw_scan="$(${trm_iwinfo} "${dev}" scan)"
essid_list="$(printf "%s" "${raw_scan}" | awk '/ESSID: "/{ORS=" ";if (!seen[$0]++) for(i=2; i<=NF; i++) print $i}')"
bssid_list="$(printf "%s" "${raw_scan}" | awk '/Address: /{ORS=" ";if (!seen[$5]++) print $5}')"
f_log "debug" "main: ${trm_iwinfo}, dev: ${dev}, essid-list: ${essid_list}, bssid-list: ${bssid_list}"
if [ -n "${essid_list}" ] || [ -n "${bssid_list}" ]
then
for sta in ${trm_stalist}
do
config="${sta%%_*}"
sta_radio="${sta##*_}"
sta_essid="$(uci -q get wireless."${config}".ssid)"
sta_bssid="$(uci -q get wireless."${config}".bssid)"
sta_iface="$(uci -q get wireless."${config}".network)"
if ([ -n "$(printf "%s" "${essid_list}" | grep -Fo "\"${sta_essid}\"")" ] ||\
[ -n "$(printf "%s" "${bssid_list}" | grep -Fo "${sta_bssid}")" ]) && [ "${dev}" = "${sta_radio}" ]
then
uci -q set wireless."${config}".disabled=0
f_check "sta"
if [ "${trm_ifstatus}" = "true" ]
then
uci -q commit wireless
f_log "info " "interface '${sta_iface}' on '${sta_radio}' connected to uplink '${sta_essid:-"-"}/${sta_bssid:-"-"}' (${trm_sysver})"
f_jsnupdate "${sta_iface}" "${sta_radio}" "${sta_essid}" "${sta_bssid}"
return 0
elif [ ${trm_maxretry} -ne 0 ] && [ ${cnt} -eq ${trm_maxretry} ]
then
uci -q set wireless."${config}".disabled=1
if [ -n "${sta_essid}" ]
then
uci -q set wireless."${config}".ssid="${sta_essid}_err"
fi
if [ -n "${sta_bssid}" ]
then
uci -q set wireless."${config}".bssid="${sta_bssid}_err"
fi
uci -q commit wireless
f_check "dev"
f_log "info " "can't connect to uplink '${sta_essid:-"-"}/${sta_bssid:-"-"}' (${cnt}/${trm_maxretry}), uplink disabled (${trm_sysver})"
else
if [ ${trm_maxretry} -eq 0 ]
then
cnt=0
fi
uci -q revert wireless
f_check "dev"
f_log "info " "can't connect to uplink '${sta_essid:-"-"}/${sta_bssid:-"-"}' (${cnt}/${trm_maxretry}) (${trm_sysver})"
fi
f_jsnupdate "${sta_iface}" "${sta_radio}" "${sta_essid}" "${sta_bssid}"
fi
done
fi
cnt=$((cnt+1))
sleep 5
done
done
if [ ! -s "${trm_rtfile}" ]
then
trm_ifstatus="false"
f_jsnupdate "n/a" "n/a" "n/a" "n/a"
fi
else
if [ ! -s "${trm_rtfile}" ]
then
config="$(ubus -S call network.wireless status | jsonfilter -l1 -e '@.*.interfaces[@.config.mode="sta"].section')"
sta_radio="$(uci -q get wireless."${config}".device)"
sta_essid="$(uci -q get wireless."${config}".ssid)"
sta_bssid="$(uci -q get wireless."${config}".bssid)"
sta_iface="$(uci -q get wireless."${config}".network)"
f_jsnupdate "${sta_iface}" "${sta_radio}" "${sta_essid}" "${sta_bssid}"
fi
fi
}
# source required system libraries
#
if [ -r "/lib/functions.sh" ] && [ -r "/usr/share/libubox/jshn.sh" ]
then
. "/lib/functions.sh"
. "/usr/share/libubox/jshn.sh"
else
f_log "error" "system libraries not found"
fi
# handle different travelmate actions
#
f_envload
case "${1}" in
status)
f_status
;;
*)
f_main
while [ ${trm_automatic} -eq 1 ]
do
sleep ${trm_timeout}
f_envload
f_main
done
;;
esac
exit 0