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241 lines
7.5 KiB
241 lines
7.5 KiB
#!/bin/sh
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# travelmate, a wlan connection manager for travel router
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# written by 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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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# set initial defaults
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#
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LC_ALL=C
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PATH="/usr/sbin:/usr/bin:/sbin:/bin"
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trm_ver="0.5.0"
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trm_sysver="$(ubus -S call system board | jsonfilter -e '@.release.description')"
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trm_enabled=1
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trm_debug=0
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trm_active=0
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trm_maxwait=30
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trm_maxretry=3
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trm_timeout=60
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trm_iw=1
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# f_envload: load travelmate environment
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#
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f_envload()
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{
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# source required system libraries
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#
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if [ -r "/lib/functions.sh" ]
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then
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. "/lib/functions.sh"
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else
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f_log "error" "required system library not found"
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fi
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# load uci config and check 'enabled' option
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#
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option_cb()
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{
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local option="${1}"
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local value="${2}"
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eval "${option}=\"${value}\""
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}
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config_load travelmate
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if [ ${trm_enabled} -ne 1 ]
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then
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f_log "info " "travelmate is currently disabled, please set 'trm_enabled' to '1' to use this service"
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exit 0
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fi
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# check for preferred wireless tool
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#
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if [ ${trm_iw} -eq 1 ]
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then
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trm_scanner="$(which iw)"
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else
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trm_scanner="$(which iwinfo)"
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fi
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if [ -z "${trm_scanner}" ]
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then
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f_log "error" "no wireless tool for wlan scanning found, please install 'iw' or 'iwinfo'"
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fi
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}
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# f_prepare: gather radio information & bring down all STA interfaces
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#
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f_prepare()
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{
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local config="${1}"
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local mode="$(uci -q get wireless."${config}".mode)"
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local radio="$(uci -q get wireless."${config}".device)"
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local disabled="$(uci -q get wireless."${config}".disabled)"
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if [ "${mode}" = "ap" ] && ([ -z "${disabled}" ] || [ "${disabled}" = "0" ]) && \
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([ -z "${trm_radio}" ] || [ "${trm_radio}" = "${radio}" ])
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then
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trm_radiolist="${trm_radiolist} ${radio}"
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elif [ "${mode}" = "sta" ]
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then
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trm_stalist="${trm_stalist} ${config}_${radio}"
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if [ -z "${disabled}" ] || [ "${disabled}" = "0" ]
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then
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uci -q set wireless."${config}".disabled=1
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fi
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fi
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f_log "debug" "mode: ${mode}, radio: ${radio}, config: ${config}, disabled: ${disabled}"
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}
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# f_check: check interface status
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#
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f_check()
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{
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local ifname radio cnt=1 mode="${1}"
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trm_ifstatus="false"
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while [ ${cnt} -le ${trm_maxwait} ]
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do
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if [ "${mode}" = "ap" ]
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then
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for radio in ${trm_radiolist}
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do
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trm_ifstatus="$(ubus -S call network.wireless status | jsonfilter -e "@.${radio}.up")"
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if [ "${trm_ifstatus}" = "true" ]
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then
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trm_aplist="${trm_aplist} $(ubus -S call network.wireless status | jsonfilter -e "@.${radio}.interfaces[@.config.mode=\"ap\"].ifname")_${radio}"
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ifname="${trm_aplist}"
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else
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trm_aplist=""
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trm_ifstatus="false"
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break
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fi
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done
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else
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ifname="$(ubus -S call network.wireless status | jsonfilter -l1 -e '@.*.interfaces[@.config.mode="sta"].ifname')"
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if [ -n "${ifname}" ]
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then
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trm_ifstatus="$(ubus -S call network.interface dump | jsonfilter -e "@.interface[@.device=\"${ifname}\"].up")"
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fi
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fi
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if [ "${mode}" = "initial" ] || [ "${trm_ifstatus}" = "true" ]
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then
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break
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fi
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cnt=$((cnt+1))
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sleep 1
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done
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f_log "debug" "mode: ${mode}, name: ${ifname}, status: ${trm_ifstatus}, count: ${cnt}, max-wait: ${trm_maxwait}"
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}
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# f_active: keep travelmate in an active state
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#
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f_active()
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{
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if [ ${trm_active} -eq 1 ]
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then
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(sleep ${trm_timeout}; /etc/init.d/travelmate start >/dev/null 2>&1) &
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fi
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}
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# f_log: function to write to syslog
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#
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f_log()
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{
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local class="${1}"
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local log_msg="${2}"
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if [ -n "${log_msg}" ] && ([ "${class}" != "debug" ] || [ ${trm_debug} -eq 1 ])
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then
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logger -t "travelmate-[${trm_ver}] ${class}" "${log_msg}"
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if [ "${class}" = "error" ]
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then
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logger -t "travelmate-[${trm_ver}] ${class}" "Please check 'https://github.com/openwrt/packages/blob/master/net/travelmate/files/README.md' (${trm_sysver})"
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f_active
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exit 255
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fi
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fi
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}
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# f_main: main function for connection handling
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#
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f_main()
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{
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local ssid_list config ap_radio sta_radio ssid cnt=1
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f_check "initial"
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if [ "${trm_ifstatus}" != "true" ]
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then
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config_load wireless
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config_foreach f_prepare wifi-iface
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if [ -n "$(uci -q changes wireless)" ]
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then
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uci -q commit wireless
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ubus call network reload
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fi
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f_check "ap"
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f_log "debug" "ap-list: ${trm_aplist}, sta-list: ${trm_stalist}"
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if [ -z "${trm_aplist}" ] || [ -z "${trm_stalist}" ]
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then
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f_log "error" "no usable AP/STA configuration found"
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fi
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for ap in ${trm_aplist}
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do
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cnt=1
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ap_radio="${ap##*_}"
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ap="${ap%%_*}"
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if [ -z "$(printf "${trm_stalist}" | grep -Fo "_${ap_radio}")" ]
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then
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continue
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fi
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while [ ${cnt} -le ${trm_maxretry} ]
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do
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if [ ${trm_iw} -eq 1 ]
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then
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ssid_list="$(${trm_scanner} dev "${ap}" scan 2>/dev/null | \
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awk '/SSID: /{if(!seen[$0]++){printf "\"";for(i=2; i<=NF; i++)if(i==2)printf $i;else printf " "$i;printf "\" "}}')"
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else
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ssid_list="$(${trm_scanner} "${ap}" scan | \
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awk '/ESSID: ".*"/{ORS=" ";if (!seen[$0]++) for(i=2; i<=NF; i++) print $i}')"
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fi
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f_log "debug" "scanner: ${trm_scanner}, ap: ${ap}, ssids: ${ssid_list}"
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if [ -n "${ssid_list}" ]
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then
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for sta in ${trm_stalist}
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do
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config="${sta%%_*}"
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sta_radio="${sta##*_}"
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ssid="\"$(uci -q get wireless."${config}".ssid)\""
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if [ -n "$(printf "${ssid_list}" | grep -Fo "${ssid}")" ] && [ "${ap_radio}" = "${sta_radio}" ]
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then
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uci -q set wireless."${config}".disabled=0
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ubus call network reload
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f_check "sta"
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if [ "${trm_ifstatus}" = "true" ]
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then
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uci -q commit wireless
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f_log "info " "wwan interface connected to uplink ${ssid} (${trm_sysver})"
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sleep 5
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return 0
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else
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uci -q revert wireless
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ubus call network reload
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f_log "info " "wwan interface can't connect to uplink ${ssid} (${trm_sysver})"
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fi
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fi
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done
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fi
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cnt=$((cnt+1))
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sleep 5
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done
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done
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fi
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}
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f_envload
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if [ ${trm_active} -eq 0 ] || ([ ${trm_active} -eq 1 ] && [ $(pgrep -f "/usr/bin/travelmate.sh" | wc -l) -eq 3 ])
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then
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f_main
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f_active
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fi
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exit 0
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