Updates to protocol

Add ping function to test connectivity, detect send buffer attacks, and sync time.
Report a client's own IP back to it.
Add a status field to transactions (optional, used for consensus building)
Update contact field:
 Contact records are signed so you can't lie about other nodes
 Contact record can contain multiple addresses (say, one IPv4 and one IPv6)
 Contact record is timestamped, so you can't provide an obsolete one
 Nodes can extend their contact record with an URL, organization name, or policy
Add a command to request contact information.
Allow nodes to locate nodes in their static trust list if they wish.

newcoin.proto

@@ -1,6 +1,6 @@
 package newcoin;
 
-enum Type { 
+enum Type {
 	HELLO=				1; 
 	TRANSACTION=		2; 
 	FULL_LEDGER=		3;
@@ -10,14 +10,18 @@ enum Type {
 	GET_VALIDATIONS=	7;
 	GET_CONTACTS=		8;
 	CONTACT=			9;
-	ERROR_MSG=			10;
+	PING=				10;
+	ERROR_MSG=			11;
 }
 
 // Sent on connect
 message Hello {
 	required int32 version			= 1;
 	required bytes nodeID			= 2;
-	required int32 port				= 3;
+	required bytes pubKey			= 3;
+	required int32 port			= 4;
+	optional int32 yourIP			= 5; // client may not know own IP
+	optional int64 netTime			= 6;
 }
 
 
@@ -28,14 +32,28 @@ you must first combine coins from one address to another.
 */
 // TODO: do we need a transID? I don't think we do
 // ledgerIndex should increase the ledger coherence
+
+enum TransactionStatus {
+	ACCEPTED=		1;
+	INVALID=		2; // signature or format error
+	INSUFFICIENT_FUNDS=	3;
+	INSUFFICIENT_FEE=	4;
+	CONFLICTED=		5; // send account is past the index
+	HELD=			6; // ledger or index in the future
+}
+	
+
 message Transaction {
 	required bytes from				= 1;
 	required bytes dest				= 2;
 	required uint64 amount			= 3;
-	required uint32 ledgerIndex		= 4;
-	required int32 seqNum			= 5;
-	required bytes pubKey			= 6;
-	required bytes sig				= 7;
+	required uint32 sourceLedgerIndex	= 4;
+	required uint32 seqNum			= 5;
+	required uint32 ident			= 6;
+	required bytes pubKey			= 7;
+	required bytes sig				= 8;
+	optional TransactionStatus status		= 9;
+	optional uint32 ledgerIndex			= 10;
 }
 
 // Sequence number is incremented if you must change the ledger that you are validating
@@ -76,10 +94,42 @@ message GetValidations {
 	required uint32 ledgerIndex		= 1;
 }
 
+
 message Contact {
-	required string nodeID			= 1;
-	required string nodeIP			= 2;
-	required int32 port				= 3;
+
+	message NodeInfo { // optional node identifying information
+		enum infoType {
+			ORG_NAME	= 0;
+			NODE_NAME	= 1;
+			URL		= 2;
+			ADMIN_EMAIL	= 3;
+			NODE_POLICY	= 4;
+		}
+		required infoType NItype = 1;
+		required string NIvalue = 2;
+	}
+
+	message ContactInfo { // this is the signed portion
+		required string nodeID			= 1;
+		required bytes pubKey			= 2;
+		required string nodeIP			= 3;
+		repeated string additionalIPs		= 4; // support both IPv4 and IPv6
+		required int32 port				= 5;
+		required int32 protoVersion			= 6;
+		required int32 nodeFlags			= 7;
+		repeated NodeInfo nodeInfo			= 8;
+		optional uint64 timestamp			= 9;
+	}
+
+	required ContactInfo nodeInfo			= 1;
+	required bytes signature			= 2;
+	required int32 distance				= 3; // hops to this node
+}
+
+// request node information
+message GetContacts {
+	repeated bytes nodeIDs			=1; // specific nodes we want
+	optional int32 nodeCount		=2; // get some random nodes
 }
 
 // I thought about adding a hash of the transactions here so you know if the difference is 
@@ -88,11 +138,25 @@ message Contact {
 // but it might be worth also sending a hash of the accounts since if these match you don't care that the transactions don't
 message ProposeLedger {
 	required uint32 ledgerIndex		= 1;
-	required bytes hash				= 2;
-	optional uint64 numTransactions	= 3;
+	required bytes hash			= 2;
+	optional uint64 numTransactions		= 3;
 }
 
+
+message Ping {
+	enum pingType {
+		PING = 0; // we want a reply
+		PONG = 1; // this is a reply
+	}
+	required pingType type		= 1;
+	optional int32 pingVal		= 2; // detect stale replies, ensure other side is reading
+	optional uint64 pingTime	= 3; // know when we think we sent the ping
+	optional uint64 netTime		= 4;
+}
+
+
 message ErrorMsg {
 	optional int32 errorCode		= 1;
 	optional string message			= 2;
-}
+}
+