Added trade hack detection code

changelog.txt

@@ -1,7 +1,12 @@
 EQEMu Changelog (Started on Sept 24, 2003 15:50)
 -------------------------------------------------------
-== 21/01/2016 ==
+== 12/03/2016 ==
-Uleat: Disabled RoF+ clients from augmentation items not in their possessions slots (0-29, 9999, 251-330) to abate an exploit in the current code
+Uleat: Added hack detection to trade code
+	- If illegal items are found in trade slots when the 'trade' button is clicked, the trade is cancelled and a message is sent to the offending player
+	- Future revisions will, at a minimum, log the player as a hacker once the quirks have been worked out
+
+== 12/01/2016 ==
+Uleat: Disabled RoF+ clients from augmenting items not in their possessions slots (0-29, 9999, 251-330) to abate an exploit in the current code
 
 == 10/17/2016 ==
 Uleat: Moved namespace ItemField from item_instance.h to shareddb.cpp - the only place it is used

common/item_instance.cpp

@@ -819,6 +819,32 @@ bool EQEmu::ItemInstance::IsSlotAllowed(int16 slot_id) const {
 	else { return false; }
 }
 
+bool EQEmu::ItemInstance::IsDroppable(bool recurse) const
+{
+	if (!m_item)
+		return false;
+	/*if (m_ornamentidfile) // not implemented
+		return false;*/
+	if (m_attuned)
+		return false;
+	/*if (m_item->FVNoDrop != 0) // not implemented
+		return false;*/
+	if (m_item->NoDrop == 0)
+		return false;
+
+	if (recurse) {
+		for (auto iter : m_contents) {
+			if (!iter.second)
+				continue;
+
+			if (!iter.second->IsDroppable(recurse))
+				return false;
+		}
+	}
+	
+	return true;
+}
+
 void EQEmu::ItemInstance::Initialize(SharedDatabase *db) {
 	// if there's no actual item, don't do anything
 	if (!m_item)

common/item_instance.h

@@ -188,6 +188,8 @@ namespace EQEmu
 
 		bool IsSlotAllowed(int16 slot_id) const;
 
+		bool IsDroppable(bool recurse = true) const;
+
 		bool IsScaling() const				{ return m_scaling; }
 		bool IsEvolving() const				{ return (m_evolveLvl >= 1); }
 		uint32 GetExp() const				{ return m_exp; }

zone/client.h

@@ -855,6 +855,7 @@ public:
 	void SetConsumption(int32 in_hunger, int32 in_thirst);
 
 	bool CheckTradeLoreConflict(Client* other);
+	bool CheckTradeNonDroppable();
 	void LinkDead();
 	void Insight(uint32 t_id);
 	bool CheckDoubleAttack();

zone/client_packet.cpp

@@ -13287,7 +13287,6 @@ void Client::Handle_OP_TradeAcceptClick(const EQApplicationPacket *app)
 			other->trade->state = TradeCompleting;
 			trade->state = TradeCompleting;
 
-			// should we do this for NoDrop items as well?
 			if (CheckTradeLoreConflict(other) || other->CheckTradeLoreConflict(this)) {
 				Message_StringID(13, TRADE_CANCEL_LORE);
 				other->Message_StringID(13, TRADE_CANCEL_LORE);
@@ -13296,6 +13295,26 @@ void Client::Handle_OP_TradeAcceptClick(const EQApplicationPacket *app)
 				other->trade->Reset();
 				trade->Reset();
 			}
+			else if (CheckTradeNonDroppable()) {
+				Message_StringID(13, TRADE_HAS_BEEN_CANCELLED);
+				other->Message_StringID(13, TRADE_HAS_BEEN_CANCELLED);
+				this->FinishTrade(this);
+				other->FinishTrade(other);
+				other->trade->Reset();
+				trade->Reset();
+				Message(15, "Hacking activity detected in trade transaction.");
+				// TODO: query (this) as a hacker
+			}
+			else if (other->CheckTradeNonDroppable()) {
+				Message_StringID(13, TRADE_HAS_BEEN_CANCELLED);
+				other->Message_StringID(13, TRADE_HAS_BEEN_CANCELLED);
+				this->FinishTrade(this);
+				other->FinishTrade(other);
+				other->trade->Reset();
+				trade->Reset();
+				other->Message(15, "Hacking activity detected in trade transaction.");
+				// TODO: query (other) as a hacker
+			}
 			else {
 				// Audit trade to database for both trade streams
 				other->trade->LogTrade();

zone/string_ids.h

@@ -255,6 +255,7 @@
 #define MEMBER_OF_YOUR_GUILD		1429
 #define OFFICER_OF_YOUR_GUILD		1430
 #define LEADER_OF_YOUR_GUILD		1431
+#define TRADE_HAS_BEEN_CANCELLED	1449
 #define RECEIVED_PLATINUM			1452	//You receive %1 Platinum from %2.
 #define RECEIVED_GOLD				1453	//You receive %1 Gold from %2.
 #define RECEIVED_SILVER				1454	//You receive %1 Silver from %2.

zone/trading.cpp

@@ -967,23 +967,37 @@ bool Client::CheckTradeLoreConflict(Client* other)
 {
 	if (!other)
 		return true;
-	// Move each trade slot into free inventory slot
-	for (int16 i = EQEmu::legacy::TRADE_BEGIN; i <= EQEmu::legacy::TRADE_END; i++){
-		const EQEmu::ItemInstance* inst = m_inv[i];
 
-		if (inst && inst->GetItem()) {
+	for (int16 index = EQEmu::legacy::TRADE_BEGIN; index <= EQEmu::legacy::TRADE_END; ++index) {
+		const EQEmu::ItemInstance* inst = m_inv[index];
+		if (!inst || !inst->GetItem())
+			continue;
+
 		if (other->CheckLoreConflict(inst->GetItem()))
 			return true;
 	}
-	}
 
-	for (int16 i = EQEmu::legacy::TRADE_BAGS_BEGIN; i <= EQEmu::legacy::TRADE_BAGS_END; i++){
+	for (int16 index = EQEmu::legacy::TRADE_BAGS_BEGIN; index <= EQEmu::legacy::TRADE_BAGS_END; ++index) {
-		const EQEmu::ItemInstance* inst = m_inv[i];
+		const EQEmu::ItemInstance* inst = m_inv[index];
+		if (!inst || !inst->GetItem())
+			continue;
 
-		if (inst && inst->GetItem()) {
 		if (other->CheckLoreConflict(inst->GetItem()))
 			return true;
 	}
+
+	return false;
+}
+
+bool Client::CheckTradeNonDroppable()
+{
+	for (int16 index = EQEmu::legacy::TRADE_BEGIN; index <= EQEmu::legacy::TRADE_END; ++index){
+		const EQEmu::ItemInstance* inst = m_inv[index];
+		if (!inst)
+			continue;
+
+		if (!inst->IsDroppable())
+			return true;
 	}
 
 	return false;