了解openwrt ubus用法

ubus (OpenWrt micro bus architecture)

來源：ubus (OpenWrt micro bus architecture)

• ubus (OpenWrt micro bus architecture)

• provide communication between various daemons and applications

• using Unix sockets and it uses TLV (type-length-value) messages

• Every daemon registers a set of paths under a specific namespace.

• The ubus command line tool allows to interact with the ubusd server

ubus

• 顯示目前系統ubus提供那些service
  ubus list

root@OpenWrt:/# ubus list
dhcp
log
network
network.device
network.interface
network.interface.lan
network.interface.loopback
network.interface.wan
network.interface.wan6
network.wireless
service
session
system
uci

顯示system service 細節
-v (More verbose output)
顯示提供那些call object method

root@OpenWrt:/# ubus -v list system
'system' @b4b76d22
        "board":{}
        "info":{}
        "upgrade":{}
        "watchdog":{"frequency":"Integer","timeout":"Integer","stop":"Boolean"}
        "signal":{"pid":"Integer","signum":"Integer"}
        "nandupgrade":{"path":"String"}
root@OpenWrt:/#

呼叫ubus service

root@OpenWrt:/# ubus call system board
{
        "kernel": "3.18.29",
        "hostname": "OpenWrt",
        "system": "Atheros AR7240 rev 2",
        "model": "TP-Link TL-WR741N\/ND v1",
        "release": {
                "distribution": "OpenWrt",
                "version": "Chaos Calmer",
                "revision": "r49118",
                "codename": "chaos_calmer",
                "target": "ar71xx\/generic",
                "description": "OpenWrt Chaos Calmer 15.05.1"
        }
}

其它

openwrt中ubus的具体使用

來源：openwrt中ubus的具体使用

• ubus有两种调用，一个是method调用，一个是notification

• 其中method包括等待函数返回和不用等待返回

• notification是广播和DBus的signal类似

• ubus可以和ubusd服务器交互(和当前所有已经注册的服务).它对研究和调试注册的命名空间以及编写脚本非常有用

• ubuscall 调用指定命名空间中指定的方法，并且通过消息传递给它， 消息参数必须是有效的JSON字符串，并且携带函数所要求的键及值