diff --git a/lib/sniffer.rb b/lib/sniffer.rb
index f75fee2..df6524a 100644
--- a/lib/sniffer.rb
+++ b/lib/sniffer.rb
@@ -25,23 +25,64 @@ def start
 
     @done    = false
 
+    lookup_magic = { 128 => 'req ', 129 => 'resp'}
+
     cap.setfilter("port #{@port}")
     cap.loop do |packet|
       @metrics[:stats] = cap.stats
 
-      # parse key name, and size from VALUE responses
-      if packet.raw_data =~ /VALUE (\S+) \S+ (\S+)/
-        key   = $1
-        bytes = $2
+      key = ""
+      bytes = 0
+      valid_parse = false
+
+      if not packet.tcp_data.nil?
 
-        @semaphore.synchronize do
-          if @metrics[:calls].has_key?(key)
-            @metrics[:calls][key] += 1
-          else
-            @metrics[:calls][key] = 1
+        magic = packet.tcp_data[0].unpack('C')[0]
+        # binary protocol
+        if magic == 128 or magic == 129
+          # 1 byte magic
+          magic_str = lookup_magic[magic]
+          # 1 byte opcode, e.g. set or get only.. for now  0 get 1 set 2 add
+          opcode = packet.tcp_data[1].unpack('C')[0]
+          # 2 byte key length  reqs only...
+          key_length = packet.tcp_data[2,3].unpack('n')[0]
+          # 1 byte extra length
+          # 1 byte data type
+          # 2 byte status
+          # 4 byte total body length
+          total_body_length = packet.tcp_data[8,11].unpack('N')[0]
+          # 14 byte opaque
+          # 4 byte cas
+          # ---- total 24 bytes
+
+          # only do this if our opcode is 0x01 e.g. set
+          if opcode == 1 and magic == 128
+            key += packet.tcp_data[24..-1]
+            # body_length - 4 bytes gives us bytes like the ascii parser. why? cas?
+            bytes = total_body_length - 4
+            valid_parse = true
           end
+        # ascii protocol
+        elsif packet.raw_data =~ /VALUE (\S+) \S+ (\S+)/
+          key   = $1
+          bytes = $2
+          valid_parse = true
+        end
+        # replace non printable by ~
+        unless key.nil?
+          key   = key.gsub(/[^[:print:]]/, '~')
+        end
+
+        if valid_parse
+          @semaphore.synchronize do
+            if @metrics[:calls].has_key?(key)
+              @metrics[:calls][key] += 1
+            else
+              @metrics[:calls][key] = 1
+            end
 
-          @metrics[:objsize][key] = bytes.to_i
+            @metrics[:objsize][key] = bytes.to_i
+          end
         end
       end