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alfred: optionally bundle a lua script for generating a bat-hosts
Provide a lua script that uses alfred to propagate and collect all interface mac + names, then generate a /tmp/bat-hosts file. If there's already a (probably hand-made) /etc/bat-hosts it won't overwrite it, but if there's none, it will symlink /etc/bat-hosts -> /tmp/bat-hosts Signed-off-by: Gui Iribarren <gui@altermundi.net> Thanks-to: Joshua Head <joshua.head@outlook.com> [sw@simonwunderlich.de: bumped release number] Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
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@ -1,3 +1,6 @@
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config ALFRED_NEEDS_lua
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bool
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config ALFRED_NEEDS_libgps
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bool
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@ -6,6 +9,12 @@ config PACKAGE_ALFRED_VIS
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depends on PACKAGE_alfred
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default y
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config PACKAGE_ALFRED_BATHOSTS
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bool "enable autogeneration of /etc/bat-hosts"
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depends on PACKAGE_alfred
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select ALFRED_NEEDS_lua
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default n
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config PACKAGE_ALFRED_GPSD
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bool "enable gpsd service for alfred"
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depends on PACKAGE_alfred
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@ -12,7 +12,7 @@ include $(TOPDIR)/rules.mk
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#
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PKG_NAME:=alfred
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PKG_VERSION:=2013.4.0
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PKG_RELEASE:=0
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PKG_RELEASE:=1
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PKG_MD5SUM:=3891697e127b1037cfc9349fd96e9993
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PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
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@ -28,6 +28,7 @@ define Package/alfred
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CATEGORY:=Network
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TITLE:=A.L.F.R.E.D. - Almighty Lightweight Fact Remote Exchange Daemon
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DEPENDS:= +libc +IPV6:kmod-ipv6 +librt \
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+ALFRED_NEEDS_lua:lua \
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+ALFRED_NEEDS_libgps:libgps
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endef
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@ -77,6 +78,8 @@ define Package/alfred/install
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$(INSTALL_BIN) ./files/alfred.init $(1)/etc/init.d/alfred
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$(INSTALL_DIR) $(1)/etc/config
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$(INSTALL_DATA) ./files/alfred.config $(1)/etc/config/alfred
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$(INSTALL_DIR) $(1)/etc/alfred
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[ "x$(CONFIG_PACKAGE_ALFRED_BATHOSTS)" == "xy" ] && $(INSTALL_BIN) ./files/bat-hosts.lua $(1)/etc/alfred/bat-hosts.lua ; true
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endef
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$(eval $(call BuildPackage,alfred))
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107
alfred/files/bat-hosts.lua
Normal file
107
alfred/files/bat-hosts.lua
Normal file
@ -0,0 +1,107 @@
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#!/usr/bin/lua
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local type_id = 64 -- bat-hosts
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function get_hostname()
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local hostfile = io.open("/proc/sys/kernel/hostname", "r")
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local ret_string = hostfile:read()
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hostfile:close()
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return ret_string
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end
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function get_interfaces_names()
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local ret = {}
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for name in io.popen("ls -1 /sys/class/net/"):lines() do
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table.insert(ret, name)
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end
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return ret
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end
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function get_interface_address(name)
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local addressfile = io.open("/sys/class/net/"..name.."/address", "r")
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local ret_string = addressfile:read()
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addressfile:close()
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return ret_string
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end
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local function generate_bat_hosts()
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-- get hostname and interface macs/names
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-- then return a table containing valid bat-hosts lines
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local n, i
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local ifaces, ret = {}, {}
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local hostname = get_hostname()
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for n, i in ipairs(get_interfaces_names()) do
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local address = get_interface_address(i)
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if not ifaces[address] then ifaces[address] = i end
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end
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for mac, iname in pairs(ifaces) do
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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
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table.insert(ret, mac.." "..hostname.."_"..iname.."\n")
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end
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end
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return ret
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end
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local function publish_bat_hosts()
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-- pass a raw chunk of data to alfred
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local fd = io.popen("alfred -s " .. type_id, "w")
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if fd then
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local ret = generate_bat_hosts()
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if ret then
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fd:write(table.concat(ret))
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end
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fd:close()
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end
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end
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local function write_bat_hosts(rows)
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local content = { "### /tmp/bat-hosts generated by alfred-bat-hosts\n",
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"### /!\\ This file is overwritten every 5 minutes /!\\\n",
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"### (To keep manual changes, replace /etc/bat-hosts symlink with a static file)\n" }
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-- merge the chunks from all nodes, de-escaping newlines
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for _, row in ipairs(rows) do
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local node, value = unpack(row)
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table.insert(content, "# Node ".. node .. "\n")
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table.insert(content, value:gsub("\x0a", "\n") .. "\n")
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end
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-- write parsed content down to disk
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local fd = io.open("/tmp/bat-hosts", "w")
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if fd then
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fd:write(table.concat(content))
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fd:close()
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end
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-- try to make a symlink in /etc pointing to /tmp,
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-- if it exists, ln will do nothing.
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os.execute("ln -ns /tmp/bat-hosts /etc/bat-hosts 2>/dev/null")
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end
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local function receive_bat_hosts()
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-- read raw chunks from alfred, convert them to a nested table and call write_bat_hosts
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local fd = io.popen("alfred -r " .. type_id)
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--[[ this command returns something like
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{ "54:e6:fc:b9:cb:37", "00:11:22:33:44:55 ham_wlan0\x0a00:22:33:22:33:22 ham_eth0\x0a" },
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{ "90:f6:52:bb:ec:57", "00:22:33:22:33:23 spam\x0a" },
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]]--
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if fd then
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local output = fd:read("*a")
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if output then
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assert(loadstring("rows = {" .. output .. "}"))()
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write_bat_hosts(rows)
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end
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fd:close()
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end
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end
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publish_bat_hosts()
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receive_bat_hosts()
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