Openwrt的wifi脚本分析
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首先分享一下/sbin/wifi脚本
#!/bin/sh # Copyright (C) 2006 OpenWrt.org . /lib/functions.sh . /usr/share/libubox/jshn.sh usage() { cat <<EOF Usage: $0 [down|detect|reload|status] enables (default), disables or detects a wifi configuration. EOF exit 1 } ubus_wifi_cmd() { local cmd="$1" local dev="$2" json_init [ -n "$2" ] && json_add_string device "$2" ubus call network.wireless "$1" "$(json_dump)" } find_net_config() {( local vif="$1" local cfg local ifname config_get cfg "$vif" network [ -z "$cfg" ] && { include /lib/network scan_interfaces config_get ifname "$vif" ifname cfg="$(find_config "$ifname")" } [ -z "$cfg" ] && return 0 echo "$cfg" )} bridge_interface() {( local cfg="$1" [ -z "$cfg" ] && return 0 include /lib/network scan_interfaces for cfg in $cfg; do config_get iftype "$cfg" type [ "$iftype" = bridge ] && config_get "$cfg" ifname prepare_interface_bridge "$cfg" return $? done )} prepare_key_wep() { local key="$1" local hex=1 echo -n "$key" | grep -qE "[^a-fA-F0-9]" && hex=0 [ "${#key}" -eq 10 -a $hex -eq 1 ] || \ [ "${#key}" -eq 26 -a $hex -eq 1 ] || { [ "${key:0:2}" = "s:" ] && key="${key#s:}" key="$(echo -n "$key" | hexdump -ve '1/1 "%02x" ""')" } echo "$key" } wifi_fixup_hwmode() { local device="$1" local default="$2" local hwmode hwmode_11n config_get channel "$device" channel config_get hwmode "$device" hwmode case "$hwmode" in 11bg) hwmode=bg;; 11a) hwmode=a;; 11b) hwmode=b;; 11g) hwmode=g;; 11n*) hwmode_11n="${hwmode##11n}" case "$hwmode_11n" in a|g) ;; default) hwmode_11n="$default" esac config_set "$device" hwmode_11n "$hwmode_11n" ;; *) hwmode= if [ "${channel:-0}" -gt 0 ]; then if [ "${channel:-0}" -gt 14 ]; then hwmode=a else hwmode=g fi else hwmode="$default" fi ;; esac config_set "$device" hwmode "$hwmode" } _wifi_updown() { for device in ${2:-$DEVICES}; do ( config_get disabled "$device" disabled [ 1 == "$disabled" ] && { echo "'$device' is disabled" set disable } config_get iftype "$device" type if eval "type ${1}_$iftype" 2>/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 "$TYPE" in wifi-device) append DEVICES "$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 前面定义了函数，后面实际运行
wifi up
wifi down
wifi detect
wifi status
wifi reload
wifi reload_legacy
wifi –help
wifi **
不同的命令调动不同的函数
这里只分析wifi up
wifi up = wifi
执行 ubus call network reload
对network进行了reload
wifi_updown “enable” “
$2为网络设备
wifi_updown() { cmd=down [ enable = "$1" ] && { _wifi_updown disable "$2" ubus_wifi_cmd "$cmd" "$2" scan_wifi cmd=up } ubus_wifi_cmd "$cmd" "$2" _wifi_updown "$@" } 进入函数enable
ubus_wifi_cmd
ubus_wifi_cmd() { local cmd="$1" local dev="$2" json_init [ -n "$2" ] && json_add_string device "$2" ubus call network.wireless "$1" "$(json_dump)" } 0 0
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