Reference

link_dump.lua

#!/usr/bin/env eco

local hex = require 'eco.encoding.hex'
local socket = require 'eco.socket'
local rtnl = require 'eco.rtnl'
local nl = require 'eco.nl'

local function print_link(msg)
    local info = rtnl.parse_ifinfomsg(msg)

    for k, v in pairs(info) do
        if k == 'flags' or k == 'change' then
            print(k .. ':', string.format('0x%x', v))
        elseif k == 'type' then
            if v == socket.ARPHRD_ETHER then
                print(k .. ':', 'ether')
            elseif v == socket.ARPHRD_LOOPBACK then
                print(k .. ':', 'loopback')
            elseif v == socket.ARPHRD_IEEE80211_RADIOTAP then
                print(k .. ':', 'ieee802.11/radiotap')
            else
                print(k .. ':', v)
            end
        else
            print(k .. ':', v)
        end
    end

    if info.flags & rtnl.IFF_RUNNING > 0 then
        print('RUNNING')
    else
        print('NOT RUNNING')
    end

    local attrs = msg:parse_attr(rtnl.IFINFOMSG_SIZE)

    if attrs[rtnl.IFLA_IFNAME] then
        local ifname = nl.attr_get_str(attrs[rtnl.IFLA_IFNAME])
        print('ifname:', ifname)
    end

    if attrs[rtnl.IFLA_MTU] then
        local mtu = nl.attr_get_u32(attrs[rtnl.IFLA_MTU])
        print('mtu:', mtu)
    end

    if attrs[rtnl.IFLA_ADDRESS] then
        local addr = nl.attr_get_payload(attrs[rtnl.IFLA_ADDRESS])
        print('addr:', hex.encode(addr, ':'))
    end

    print()
end

local sock, err = nl.open(nl.NETLINK_ROUTE)
if not sock then
    print(err)
    return
end

local msg = nl.nlmsg(rtnl.RTM_GETLINK, nl.NLM_F_REQUEST | nl.NLM_F_DUMP)

msg:put(rtnl.rtgenmsg({ family = socket.AF_PACKET }))

local ok, err = sock:request_dump(msg, function(reply, nlh)
    if nlh.type == rtnl.RTM_NEWLINK then
        print_link(reply)
    end
end)
if not ok then
    print('err:', err)
end
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link_dump.lua
