From d0536a3bad8802379ba7faf14f29540ab3af60ae Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Fri, 9 Mar 2018 06:26:48 +0000
Subject: [PATCH] Fix bitcoin-info displaying incorrect last block; add user
 agent output

---
 nselib/bitcoin.lua       | 6 ++++--
 scripts/bitcoin-info.nse | 3 +++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/nselib/bitcoin.lua b/nselib/bitcoin.lua
index b656926bd..e22589fa4 100644
--- a/nselib/bitcoin.lua
+++ b/nselib/bitcoin.lua
@@ -299,12 +299,14 @@ Response = {
 
     -- Parses the raw data and builds the Version instance
     parse = function(self)
-      local ra, sa, cmd, nodeid
+      local ra, sa, cmd, nodeid, pos
 
       -- After 2012-02-20, version messages contain checksums
       self.magic, cmd, self.len, self.checksum, self.ver_raw, self.service,
         self.timestamp, ra, sa, nodeid,
-        self.subver, self.lastblock = string.unpack("<I4 c12 I4 I4 I4 I8 I8 c26 c26 c8 B I4", self.data)
+        pos = string.unpack("<I4 c12 I4 I4 I4 I8 I8 c26 c26 c8", self.data)
+      pos, self.user_agent = Util.decodeVarString(self.data, pos)
+      self.lastblock, pos = string.unpack("<I4", self.data, pos)
       self.nodeid = stdnse.tohex(nodeid)
       self.cmd = string.unpack("z", cmd)
 
diff --git a/scripts/bitcoin-info.nse b/scripts/bitcoin-info.nse
index 92fac1a78..5e3a0f258 100644
--- a/scripts/bitcoin-info.nse
+++ b/scripts/bitcoin-info.nse
@@ -67,6 +67,9 @@ action = function(host, port)
   result["Version"] = ver.ver
   result["Node Id"] = ver.nodeid
   result["Lastblock"] = ver.lastblock
+  if ver.user_agent ~= "" then
+    result["User Agent"] = ver.user_agent
+  end
 
   return result
 end