implement `connect`, `disconnect` and `accept`

3 files changed, 85 insertions, 9 deletions

diff --git a/PROTOCOL.md b/PROTOCOL.md
index 3bf9358..a0dd433 100644
--- a/PROTOCOL.md
+++ b/PROTOCOL.md
@@ -7,9 +7,9 @@ this should suffice as a starting point.
 | id | direction | captured | known | packet name | short description |  
 |-|-|-|-|-|-|
 | 0 |  | ☐ | ☐ | | |
-| 1 | c->s | ☑ | ☐ | | |
-| 2 |  | ☐ | ☐ | | |
-| 3 | c<-s | &#x2611; | &#x2610; | | |
+| 1 | c->s | &#x2611; | &#x2611; | connect | login initialization |
+| 2 | s->c | &#x2611; | &#x2611; | disconnect | kick client |
+| 3 | c<-s | &#x2611; | &#x2611; | accept | accept connection |
 | 4 | c->s | &#x2611; | &#x2610; | | |
 | 5 | c->s | &#x2611; | &#x2610; | | |
 | 6 | c->s | &#x2611; | &#x2610; | | |
@@ -261,4 +261,60 @@ this should suffice as a starting point.
 | 252 |  | &#x2610; | &#x2610; | | |
 | 253 |  | &#x2610; | &#x2610; | | |
 | 254 |  | &#x2610; | &#x2610; | | |
-| 255 |  | &#x2610; | &#x2610; | | |
\ No newline at end of file
+| 255 |  | &#x2610; | &#x2610; | | |
+
+
+## `id 1` `c->s` connect
+
+| name | type | size | description |
+|--|--|--|--|
+| version | pstring | - | terraria protocol version in form of "TerrariaXXX" |
+
+ilspy decompilation:
+```csharp
+    // Terraria.NetMessage.SendData
+    case 1:
+        writer.Write("Terraria" + 318);
+        break;
+```
+
+## `id 2` `s->c` disconnect
+kick client from server. server closes connection right after sending this
+
+| name | type | size | description |
+|--|--|--|--|
+| reason | netstring | - | reason for kicking. may be ban, invalid client version, etc. |
+
+ilspy decompilation:
+```csharp
+    // Terraria.NetMessage.SendData
+    case 2:
+        text.Serialize(writer);
+        if (Main.dedServ)
+        {
+            Console.WriteLine(Language.GetTextValue("CLI.ClientWasBooted", Netplay.Clients[num].Socket.GetRemoteAddress().ToString(), text));
+        }
+        break;
+```
+
+## `id 3` `s->c` accept
+accept client connection, pick new (player) slot id and send server flags
+
+| name | type | size | description |
+|--|--|--|--|
+| slot | uint8_t | 1 | player id |
+| server_flags | uint8_t | 1 | flags, always 0 |
+
+ilspy decompilation:
+```csharp
+    // Terraria.NetMessage.SendData
+    case 3:
+        writer.Write((byte)remoteClient);
+        writer.Write(value: false);
+        break;
+
+    // Terraria.MessageBuffer.GetData
+    int num95 = reader.ReadByte();
+    bool value2 = reader.ReadBoolean();
+    Netplay.Connection.ServerSpecialFlags[2] = value2;
+```
\ No newline at end of file
diff --git a/include/net/types.hpp b/include/net/types.hpp
index b9453d6..5301021 100644
--- a/include/net/types.hpp
+++ b/include/net/types.hpp
@@ -72,6 +72,25 @@ struct vec2 {
 	T y;
 };
 
+// NetMessages
+
+struct connect {
+	static constexpr uint8_t packet_id = 1;
+	
+	std::string version;
+};
+
+struct disconnect {
+	static constexpr uint8_t packet_id = 2;
+
+	nstring reason;
+};
+
+struct accept {
+	uint8_t slot;
+	uint8_t server_flags = 0;
+};
+
 inline nstring operator""_ns(const char* str, std::size_t)
 {
 	return nstring{nstring::Literal, str};
@@ -79,3 +98,5 @@ inline nstring operator""_ns(const char* str, std::size_t)
 
 }
 }
+
+using net::packet::operator""_ns;
diff --git a/include/util/io.hpp b/include/util/io.hpp
index 629bf59..9131a96 100644
--- a/include/util/io.hpp
+++ b/include/util/io.hpp
@@ -16,11 +16,11 @@
 namespace io {
 
 template <class T, class K>
-concept custom_write = requires(T t) {
-	{ t.write(K()) } -> std::same_as<ssize_t>;
+concept custom_write = requires(T t, K &k) {
+	{ t.write(k) } -> std::same_as<ssize_t>;
 };
 template <class T, class K>
-concept custom_read = requires(T& t, K& k) {
+concept custom_read = requires(T& t, K &k) {
 	{ t.read(k) } -> std::same_as<ssize_t>;
 };
 
@@ -108,7 +108,6 @@ public:
 template <class I>
 class serialized_io {
 	I io;
-
 public:
 	serialized_io(I io)
 	    : io(io)
@@ -193,7 +192,7 @@ public:
 	}
 
 	template <custom_write<serialized_io<I>> T>
-	ssize_t write(T& f)
+	ssize_t write(T f)
 	{
 		return f.write(*this);
 	}