From 67b0a6ba4928b73672dd127c9d99bea99aea131b Mon Sep 17 00:00:00 2001
From: Jaroslav Svoboda <multi.flexi@seznam.cz>
Date: Tue, 13 May 2025 16:01:34 +0200
Subject: [PATCH] ESC/VP.net detector

---
 scripts/escvpnet.nse | 59 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 scripts/escvpnet.nse

diff --git a/scripts/escvpnet.nse b/scripts/escvpnet.nse
new file mode 100644
index 000000000..4c74a4636
--- /dev/null
+++ b/scripts/escvpnet.nse
@@ -0,0 +1,59 @@
+local nmap = require "nmap"
+local shortport = require "shortport"
+local stdnse = require "stdnse"
+
+description = [[
+Detects availability of the ESC/VP.net protocol used to 
+monitor and control Epson projectors.
+Sends a specific ESC/VP.net message and parses the response.
+]]
+
+author = "Jaroslav Svoboda"
+license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
+categories = {"discovery", "safe"}
+
+portrule = shortport.port_or_service({3629}, "escvpnet")
+
+action = function(host, port)
+    local socket = nmap.new_socket()
+    local status, err
+    local output
+
+    -- Define the ESC/VP.net message
+    local message = "ESC/VP.net\x10\x01\x00\x00\x00\x00"
+
+    -- Try to connect to the target
+    status, err = socket:connect(host, port)
+    if not status then
+        return "Failed to connect: " .. err
+    else
+        stdnse.print_debug(1, "Connected to " .. host.ip .. ":" .. port.number)
+    end
+
+    -- Send the ESC/VP.net message
+    status, err = socket:send(message)
+    if not status then
+        socket:close()
+        return "Failed to send message: " .. err
+    else
+        stdnse.print_debug(1, "Command sent: " .. stdnse.tohex(message))
+    end
+
+    -- Receive the response
+    local status, lines = socket:receive_lines(1)
+    if not status then
+        socket:close()
+        return "Failed to receive response: " .. lines
+    end
+
+    socket:close()
+
+    stdnse.print_debug(1, "Raw response received: " .. stdnse.tohex(lines))
+    if lines:match("^ESC/VP.net") then
+        output = "ESC/VP.net device detected"
+    else
+        output = "No valid ESC/VP.net response detected."
+    end
+
+    return output
+end