Openwrt.wifi.脚本分析之/sbin/wifi
作用：
1.使用wifi脚本自动生成配置，命令是rm /etc/config/wireless; wifi detect > /etc/config/wireless
2.使用wifi脚本打开wifi功能。
3.使用wifi脚本查看当前wifi信息。
#!/bin/sh
# Copyright (C) 2006 OpenWrt.org
. /lib/functions.sh
. /usr/share/libubox/jshn.sh
usage() {
cat </dev/null >/dev/null; then
eval "scan_$iftype '$device'"
eval "${1}_$iftype '$device'" || echo "$device($iftype): ${1} failed"
elif [ ! -f /lib/netifd/wireless/$iftype.sh ]; then
echo "$device($iftype): Interface type not supported"
fi
); done
}
wifi_updown() {
cmd=down
[ enable = "$1" ] && {
_wifi_updown disable "$2"
ubus_wifi_cmd "$cmd" "$2"
scan_wifi
cmd=up
}
ubus_wifi_cmd "$cmd" "$2"
_wifi_updown "$@"
}
wifi_reload_legacy() {
_wifi_updown "disable" "$1"
scan_wifi
_wifi_updown "enable" "$1"
}
wifi_reload() {
ubus call network reload
wifi_reload_legacy
}
wifi_detect() {
for driver in ${2:-$DRIVERS}; do (
if eval "type detect_$driver" 2>/dev/null >/dev/null; then
eval "detect_$driver" || echo "$driver: Detect failed" >&2
else
echo "$driver: Hardware detection not supported" >&2
fi
); done
}
start_net() {(
local iface="$1"
local config="$2"
local vifmac="$3"
[ -f "/var/run/$iface.pid" ] && kill "$(cat /var/run/${iface}.pid)" 2>/dev/null
[ -z "$config" ] || {
include /lib/network
scan_interfaces
for config in $config; do
setup_interface "$iface" "$config" "" "$vifmac"
done
}
)}
set_wifi_up() {
local cfg="$1"
local ifname="$2"
uci_set_state wireless "$cfg" up 1
uci_set_state wireless "$cfg" ifname "$ifname"
}
set_wifi_down() {
local cfg="$1"
local vifs vif vifstr
[ -f "/var/run/wifi-${cfg}.pid" ] &&
kill "$(cat "/var/run/wifi-${cfg}.pid")" 2>/dev/null
uci_revert_state wireless "$cfg"
config_get vifs "$cfg" vifs
for vif in $vifs; do
uci_revert_state wireless "$vif"
done
}
scan_wifi() {
local cfgfile="$1"
DEVICES=
config_cb() {
local type="$1"
local section="$2"
# section start
case "$type" in
wifi-device)
append DEVICES "$section"
config_set "$section" vifs ""
config_set "$section" ht_capab ""
;;
esac
# section end
config_get TYPE "$CONFIG_SECTION" TYPE
case "$TYPE" in
wifi-iface)
config_get device "$CONFIG_SECTION" device
config_get vifs "$device" vifs
append vifs "$CONFIG_SECTION"
config_set "$device" vifs "$vifs"
;;
esac
}
config_load "${cfgfile:-wireless}"
}
DEVICES=
DRIVERS=
include /lib/wifi
scan_wifi
case "$1" in
down) wifi_updown "disable" "$2";;
detect) wifi_detect "$2";;
status) ubus_wifi_cmd "status" "$2";;
reload) wifi_reload "$2";;
reload_legacy) wifi_reload_legacy "$2";;
--help|help) usage;;
*) ubus call network reload; wifi_updown "enable" "$2";;
esac 前面定义函数，后面定义执行任务。
wifi up wlan3：执行 ubus call network reload，对network进行了reload ，而后执行 wifi_updown “enable” “wlan3".2”
wifi down ：
wifi detect >/etc/config/wireless：
wifi status ：json格式返回当前的wifi状态信息。
root@OpenWrt:~# wifi status
{
"radio0": {
"up": true,
"pending": false,
"autostart": true,
"disabled": false,
"config": {
"hwmode": "11ng",
"path": "10180000.wmac",
"htmode": "HT20",
"ht_capab": [
"GF",
"SHORT-GI-20",
"SHORT-GI-40",
"RX-STBC1"
],
"country": "00",
"txpower": 15,
"channel": "3",
"disabled": false
},
"interfaces": [
{
"section": "@wifi-iface[0]",
"ifname": "wlan0",
"config": {
"mode": "ap",
"encryption": "psk-mixed",
"ssid": "LE20903",
"key": "LLE20903",
"mode": "ap",
"network": [
"lan"
],
"disabled": false
}
},
{
"section": "@wifi-iface[1]",
"ifname": "wlan0-1",
"config": {
"mode": "ap",
"encryption": "psk-mixed",
"ssid": "LL20903",
"key": "157AECC4C364",
"mode": "ap",
"network": [
"lan"
],
"disabled": false
}
}
]
}
}