ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/external/routing/alfred/files/bat-hosts.lua b/external/routing/alfred/files/bat-hosts.lua
new file mode 100644
index 0000000..f9fe586
--- /dev/null
+++ b/external/routing/alfred/files/bat-hosts.lua
@@ -0,0 +1,112 @@
+#!/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
+-- "alfred -r" can fail in slave nodes (returns empty stdout), so:
+-- check output is not null before writing /tmp/bat-hosts, and retry 3 times before giving up.
+ for n = 1, 3 do
+ 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")
+ fd:close()
+ if output and output ~= "" then
+ assert(loadstring("rows = {" .. output .. "}"))()
+ write_bat_hosts(rows)
+ break
+ end
+ end
+ end
+end
+
+publish_bat_hosts()
+receive_bat_hosts()