108 lines
2.8 KiB
Lua
108 lines
2.8 KiB
Lua
|
#!/usr/bin/lua
|
||
|
|
|
||
|
|
local type_id = 64 -- bat-hosts
|
||
|
|
|
||
|
|
function get_hostname()
|
||
|
|
local hostfile = io.open("/proc/sys/kernel/hostname", "r")
|
||
|
|
local ret_string = hostfile:read()
|
||
|
|
hostfile:close()
|
||
|
|
return ret_string
|
||
|
|
end
|
||
|
|
|
||
|
|
function get_interfaces_names()
|
||
|
|
local ret = {}
|
||
|
|
|
||
|
|
for name in io.popen("ls -1 /sys/class/net/"):lines() do
|
||
|
|
table.insert(ret, name)
|
||
|
|
end
|
||
|
|
|
||
|
|
return ret
|
||
|
|
end
|
||
|
|
|
||
|
|
function get_interface_address(name)
|
||
|
|
local addressfile = io.open("/sys/class/net/"..name.."/address", "r")
|
||
|
|
local ret_string = addressfile:read()
|
||
|
|
addressfile:close()
|
||
|
|
return ret_string
|
||
|
|
end
|
||
|
|
|
||
|
|
|
||
|
|
local function generate_bat_hosts()
|
||
|
|
-- get hostname and interface macs/names
|
||
|
|
-- then return a table containing valid bat-hosts lines
|
||
|
|
local n, i
|
||
|
|
local ifaces, ret = {}, {}
|
||
|
|
|
||
|
|
local hostname = get_hostname()
|
||
|
|
|
||
|
|
for n, i in ipairs(get_interfaces_names()) do
|
||
|
|
local address = get_interface_address(i)
|
||
|
|
if not ifaces[address] then ifaces[address] = i end
|
||
|
|
end
|
||
|
|
|
||
|
|
for mac, iname in pairs(ifaces) do
|
||
|
|
if mac:match("^%x%x:%x%x:%x%x:%x%x:%x%x:%x%x$") and not mac:match("00:00:00:00:00:00") then
|
||
|
|
table.insert(ret, mac.." "..hostname.."_"..iname.."\n")
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
return ret
|
||
|
|
end
|
||
|
|
|
||
|
|
local function publish_bat_hosts()
|
||
|
|
-- pass a raw chunk of data to alfred
|
||
|
|
local fd = io.popen("alfred -s " .. type_id, "w")
|
||
|
|
if fd then
|
||
|
|
local ret = generate_bat_hosts()
|
||
|
|
if ret then
|
||
|
|
fd:write(table.concat(ret))
|
||
|
|
end
|
||
|
|
fd:close()
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
local function write_bat_hosts(rows)
|
||
|
|
local content = { "### /tmp/bat-hosts generated by alfred-bat-hosts\n",
|
||
|
|
"### /!\\ This file is overwritten every 5 minutes /!\\\n",
|
||
|
|
"### (To keep manual changes, replace /etc/bat-hosts symlink with a static file)\n" }
|
||
|
|
|
||
|
|
-- merge the chunks from all nodes, de-escaping newlines
|
||
|
|
for _, row in ipairs(rows) do
|
||
|
|
local node, value = unpack(row)
|
||
|
|
table.insert(content, "# Node ".. node .. "\n")
|
||
|
|
table.insert(content, value:gsub("\x0a", "\n") .. "\n")
|
||
|
|
end
|
||
|
|
|
||
|
|
-- write parsed content down to disk
|
||
|
|
local fd = io.open("/tmp/bat-hosts", "w")
|
||
|
|
if fd then
|
||
|
|
fd:write(table.concat(content))
|
||
|
|
fd:close()
|
||
|
|
end
|
||
|
|
|
||
|
|
-- try to make a symlink in /etc pointing to /tmp,
|
||
|
|
-- if it exists, ln will do nothing.
|
||
|
|
os.execute("ln -ns /tmp/bat-hosts /etc/bat-hosts 2>/dev/null")
|
||
|
|
end
|
||
|
|
|
||
|
|
local function receive_bat_hosts()
|
||
|
|
-- read raw chunks from alfred, convert them to a nested table and call write_bat_hosts
|
||
|
|
local fd = io.popen("alfred -r " .. type_id)
|
||
|
|
--[[ this command returns something like
|
||
|
|
{ "54:e6:fc:b9:cb:37", "00:11:22:33:44:55 ham_wlan0\x0a00:22:33:22:33:22 ham_eth0\x0a" },
|
||
|
|
{ "90:f6:52:bb:ec:57", "00:22:33:22:33:23 spam\x0a" },
|
||
|
|
]]--
|
||
|
|
|
||
|
|
if fd then
|
||
|
|
local output = fd:read("*a")
|
||
|
|
if output then
|
||
|
|
assert(loadstring("rows = {" .. output .. "}"))()
|
||
|
|
write_bat_hosts(rows)
|
||
|
|
end
|
||
|
|
fd:close()
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
publish_bat_hosts()
|
||
|
|
receive_bat_hosts()
|