Layout for 802.11AB Spec Created

Author: king-jam

decode/lldp.js

@@ -1,22 +1,38 @@
-var TLV = require("./lldp_tlv");
+var TLV = require("./lldp/lldp_tlv");
 
 function LLDP(emitter) {
-    this.emitter = emitter;
-    this.tlvArray = [];
+	this.emitter = emitter;
+	this.chassisTlv = undefined;
+	this.portIdTlv = undefined
+	this.ttlTlv = undefined;
+	this.optionalTlv = [];
 }
 
 LLDP.prototype.decode = function (raw_packet, offset) {
-    while(raw_packet.readUInt16BE(offset, true) != 0) {
-        currentTLVLength = (raw_packet.readUInt16BE(offset, true) & 0x01ff) + 2;
-        this.tlvArray.push(new TLV(this.emitter).decode (raw_packet, offset));
-        offset += currentTLVLength;
-    }
+	this.chassisTLV = new TLV(this.emitter).decode (raw_packet, offset);
+	offset += getTlvLength(raw_packet, offset);
+	this.portIdTLV = new TLV(this.emitter).decode (raw_packet, offset);
+	offset += getTlvLength(raw_packet, offset);
+	this.ttlTLV = new TLV(this.emitter).decode (raw_packet, offset);
+	offset += getTlvLength(raw_packet, offset);
+	while(raw_packet.readUInt16BE(offset, true) != 0) {
+		this.optionalTlv.push(new TLV(this.emitter).decode (raw_packet, offset));
+		offset += getTlvLength(raw_packet, offset);
+  }
 
-    if(this.emitter) { this.emitter.emit("lldp", this); }
-    return this;
+	if(this.emitter) { this.emitter.emit("lldp", this); }
+	return this;
+}
+
+var getTlvLength = function(raw_packet, offset) {
+	var tlvHeaderSize = 2;
+	length = (raw_packet.readUInt16BE(offset, true) & 0x01ff) + tlvHeaderSize;
+	return length;
 }
 
 LLDP.prototype.decoderName = "lldp";
 LLDP.prototype.eventsOnDecode = true;
 
+LLDP.prototype.toString() = function {}
+
 module.exports = LLDP;

decode/lldp/chassisId.js

@@ -1,3 +1,5 @@
+var types = require("./tlv_types");
+
 function TLV(emitter) {
 	this.emitter = emitter;
 	this.tlvType = undefined;
@@ -10,8 +12,12 @@ TLV.prototype.decode = function (raw_packet, offset) {
   // https://en.wikipedia.org/wiki/Link_Layer_Discovery_Protocol
   this.tlvType = (raw_packet.readUInt16BE(offset, true) & 0xfe00) >> 9;
   this.tlvLength = (raw_packet.readUInt16BE(offset, true) & 0x01ff);
-  this.payload = new Buffer(this.tlvLength);
-  this.payload.slice(raw_packet[offset+2],raw_packet[offset+this.tlvLength+2]);
+  var TlvDecoder = types[this.tlvType];
+  if(TlvDecoder == undefined) {
+    this.payload = "Unknown";
+  } else {
+    this.payload = new TlvDecoder().decode(raw_packet, offset, tlvLength);
+  }
   return this;
 }
 

decode/lldp_tlv.js renamed to decode/lldp/lldp_tlv.js

@@ -0,0 +1,17 @@
+var types = new Array(128);
+
+module.exports = types;
+
+function init(){
+  types[0] = undefined;
+  types[1] = require("./chassisId");
+  types[2] = require("./portId");
+  types[3] = require("./ttl");
+  types[4] = require("./portDescription");
+  types[5] = require("./systemName");
+  types[6] = require("./systemDesciption");
+  types[7] = require("./systemCaps");
+  types[8] = require("./managementAddress");
+  types[127] = require("./organization");
+}
+init();