Refactor send_wol function to streamline magic packet creation and enforce IPv4 UDP socket binding

scripts/auto-boot-ollama-host.lua

@@ -43,37 +43,27 @@ local function mac_to_bytes(mac)
 end
 
 local function send_wol(mac_str, bcast_ip, port)
-  local mb = mac_to_bytes(mac_str)
-  if not mb then return false, "invalid MAC" end
-  local packet = string.rep(string.char(0xFF), 6) .. mb:rep(16)
+  -- Build magic packet
+  local bytes = {}
+  for byte in mac_str:gmatch("(%x%x)") do table.insert(bytes, tonumber(byte, 16)) end
+  if #bytes ~= 6 then return false, "invalid MAC" end
+  local mac = string.char(table.unpack(bytes))
+  local packet = string.rep(string.char(0xFF), 6) .. mac:rep(16)
 
-  -- 1) Force an IPv4 UDP socket (fallback to udp() if udp4() is not available)
-  local udp_ctor = socket.udp4 or socket.udp
-  local udp = assert(udp_ctor())
+  -- Create IPv4 UDP socket (udp4 if available), bind to IPv4 wildcard to lock AF_INET
+  local udp = assert((socket.udp4 or socket.udp)())
   udp:settimeout(2)
+  assert(udp:setsockname("0.0.0.0", 0))       -- force IPv4 family
+  assert(udp:setoption("broadcast", true))    -- allow broadcast
 
-  -- 2) Bind to an IPv4 source to lock the address family
-  --    If you have WOL_SRC_IP set, bind to that; otherwise 0.0.0.0.
-  local src_ip = os.getenv("WOL_SRC_IP")
-  if src_ip and src_ip ~= "" then
-    assert(udp:setsockname(src_ip, 0))
-  else
-    assert(udp:setsockname("0.0.0.0", 0))
-  end
-
-  -- 3) Enable broadcast. This will fail on AF_INET6, so do it *after* binding IPv4.
-  assert(udp:setoption("broadcast", true))
-
-  -- 4) Send to directed broadcast (recommended) or 255.255.255.255 if you must.
   local ok, err = udp:sendto(packet, bcast_ip, port)
-
   udp:close()
-  if not ok then return false, err end
-  return true
+  return ok ~= nil, err
 end
 
 
 
+
 -- Kept for reference; not used to keep parity with your minimal bash
 -- local function port_is_up(host, port, timeout_sec)
 --   local deadline = socket.gettime() + (timeout_sec or 1)