[refactor] Validate all inbound packets before handling them

src/core/Packets.hpp

@@ -0,0 +1,63 @@
+#pragma once
+
+#include "CNStructs.hpp"
+
+#include <map>
+
+// Packet Descriptor
+struct PacketDesc {
+        uint32_t val;
+        std::string name;
+        size_t size;
+        bool variadic;
+        size_t cntMembOfs;
+        size_t trailerSize;
+
+        PacketDesc() {}
+
+        PacketDesc(const PacketDesc& other) {
+            val = other.val;
+            name = other.name;
+            size = other.size;
+            variadic = other.variadic;
+            cntMembOfs = other.cntMembOfs;
+            trailerSize = other.trailerSize;
+        }
+
+        PacketDesc(PacketDesc&& other) {
+            val = other.val;
+            name = std::move(other.name);
+            size = other.size;
+            variadic = other.variadic;
+            cntMembOfs = other.cntMembOfs;
+            trailerSize = other.trailerSize;
+        }
+
+        // non-variadic constructor
+        PacketDesc(uint32_t v, size_t s, std::string n) :
+            val(v), name(n), size(s), variadic(false) {}
+
+        // variadic constructor
+        PacketDesc(uint32_t v, size_t s, std::string n, size_t ofs, size_t ts) :
+            val(v), name(n), size(s), variadic(true), cntMembOfs(ofs), trailerSize(ts) {}
+};
+
+/*
+ * Extra trailer structs for places where the client doesn't have any, but
+ * really should.
+ */
+struct sGM_PVPTarget {
+    uint32_t eCT;
+    uint32_t iID;
+};
+
+struct sSkillResult_Leech {
+    sSkillResult_Heal_HP Heal;
+    sSkillResult_Damage Damage;
+};
+
+namespace Packets {
+    extern std::map<uint32_t, PacketDesc> packets;
+
+    std::string p2str(int val);
+}