implement new packet implementation

bot/src/main.rs

@@ -3,7 +3,7 @@ use minecraft_protocol::ServerAddress;
 use tokio::runtime::Runtime;
 
 async fn bot() {
-    let address = ServerAddress::parse(&"play.wynncraft.com".to_string()).unwrap();
+    let address = ServerAddress::parse(&"mc.hypixel.net".to_string()).unwrap();
     minecraft_protocol::server_status_pinger::ping_server(&address)
         .await
         .unwrap();

minecraft-protocol/src/connection.rs

@@ -1,6 +1,9 @@
-use crate::ServerIpAddress;
+use crate::{friendly_byte_buf::FriendlyByteBuf, packets::Packet, ServerIpAddress};
 use bytes::BytesMut;
-use tokio::{io::BufWriter, net::TcpStream};
+use tokio::{
+    io::{AsyncWriteExt, BufWriter},
+    net::TcpStream,
+};
 
 pub enum PacketFlow {
     ClientToServer,
@@ -35,4 +38,30 @@ impl Connection {
             buffer: BytesMut::with_capacity(4 * 1024 * 1024),
         })
     }
+
+    /// Write a packet to the server
+    pub async fn send_packet(&mut self, packet: &dyn Packet) {
+        // packet structure:
+        // length + id + data
+
+        // Is this efficient? I have no idea, probably not.
+        // getting rid of the FriendlyByteBuffer struct might help
+
+        // write the packet id
+        let mut id_and_data_buf = vec![packet.get_id()];
+
+        // write the packet data
+        let mut id_and_data_friendly_buf = FriendlyByteBuf::new(&mut id_and_data_buf);
+        packet.write(&mut id_and_data_friendly_buf);
+
+        // add the packet length to the beginning
+        let mut complete_buf: Vec<u8> = Vec::new();
+        let mut complete_friendly_buf = FriendlyByteBuf::new(&mut complete_buf);
+        complete_friendly_buf.write_varint(id_and_data_buf.len() as u32);
+        complete_buf.append(&mut id_and_data_buf);
+
+        // finally, write and flush to the stream
+        self.stream.write_all(&complete_buf).await.unwrap();
+        self.stream.flush().await.unwrap();
+    }
 }

minecraft-protocol/src/friendly_byte_buf.rs

@@ -1,22 +1,24 @@
 //! Minecraft calls it a "friendly byte buffer".
 
 use byteorder::{BigEndian, WriteBytesExt};
-// use std::io::Write;
 
-const MAX_VARINT_SIZE: u32 = 5;
-const MAX_VARLONG_SIZE: u32 = 10;
-const DEFAULT_NBT_QUOTA: u32 = 2097152;
+// const MAX_VARINT_SIZE: u32 = 5;
+// const MAX_VARLONG_SIZE: u32 = 10;
+// const DEFAULT_NBT_QUOTA: u32 = 2097152;
 const MAX_STRING_LENGTH: u16 = 32767;
-const MAX_COMPONENT_STRING_LENGTH: u32 = 262144;
+// const MAX_COMPONENT_STRING_LENGTH: u32 = 262144;
 
 pub struct FriendlyByteBuf<'a> {
     source: &'a mut Vec<u8>,
 }
 
-impl FriendlyByteBuf<'_> {
+impl<'a> FriendlyByteBuf<'a> {
+    pub fn new(source: &'a mut Vec<u8>) -> FriendlyByteBuf<'a> {
+        FriendlyByteBuf { source }
+    }
+
     pub fn write_byte(&mut self, n: u8) {
         self.source.write_u8(n).unwrap();
-        println!("write_byte: {}", n);
     }
 
     pub fn write_bytes(&mut self, bytes: &[u8]) {

minecraft-protocol/src/packets/client_intention_packet.rs

@@ -5,17 +5,19 @@ use crate::friendly_byte_buf::FriendlyByteBuf;
 use super::{ConnectionProtocol, Packet};
 
 #[derive(Hash)]
-pub struct ClientIntentionPacket {
-    protocol_version: u32,
-    hostname: String,
-    port: u16,
+pub struct ClientIntentionPacket<'a> {
+    pub protocol_version: u32,
+    pub hostname: &'a String,
+    pub port: u16,
     /// 1 for status, 2 for login
-    intention: ConnectionProtocol,
+    pub intention: ConnectionProtocol,
 }
 
 // implement "Packet" for "ClientIntentionPacket"
-impl Packet for ClientIntentionPacket {
-    const ID: u8 = 0x00;
+impl<'a> Packet for ClientIntentionPacket<'a> {
+    fn get_id(&self) -> u8 {
+        0x00
+    }
 
     // implement "from_reader" for "ClientIntentionPacket"
     fn write(&self, buf: &mut FriendlyByteBuf) {
@@ -25,4 +27,3 @@ impl Packet for ClientIntentionPacket {
         buf.write_varint(self.intention.clone() as u32);
     }
 }
-

minecraft-protocol/src/packets/mod.rs

@@ -1,6 +1,7 @@
-pub mod client_intention_packet;
-
-use std::collections::HashMap;
+mod client_intention_packet;
+pub use client_intention_packet::ClientIntentionPacket;
+mod serverbound_status_request_packet;
+pub use serverbound_status_request_packet::ServerboundStatusRequestPacket;
 
 use crate::friendly_byte_buf::FriendlyByteBuf;
 
@@ -13,9 +14,8 @@ pub enum ConnectionProtocol {
 }
 
 pub trait Packet {
-    /// The id of the packet, this is always a byte in vanilla.
-    /// This might be bigger than a u8 if using modpacks with lots of custom packets?
-    const ID: u8;
+    /// Get the id of the packet, this is always a byte.
+    fn get_id(&self) -> u8;
 
     fn write(&self, friendly_byte_buf: &mut FriendlyByteBuf) -> ();
 }

minecraft-protocol/src/server_status_pinger.rs

@@ -1,81 +1,22 @@
-use crate::{connection::Connection, resolver, ServerAddress};
-use tokio::{
-    io::{AsyncReadExt, AsyncWriteExt, BufWriter},
-    net::TcpStream,
-};
-
-struct ServerStatus {}
-
-async fn write_byte(buf: &mut Vec<u8>, n: u8) {
-    buf.write_u8(n).await.unwrap();
-    println!("write_byte: {}", n);
-}
-
-async fn write_bytes(buf: &mut Vec<u8>, bytes: &[u8]) {
-    buf.write_all(bytes).await.unwrap();
-    println!("write_bytes: {:?}", buf);
-}
-
-async fn write_varint(buf: &mut Vec<u8>, mut n: u32) {
-    loop {
-        if (n & 0xFFFFFF80) == 0 {
-            write_byte(buf, n as u8).await;
-            return ();
-        }
-        write_byte(buf, (n & 0x7F | 0x80) as u8).await;
-        n >>= 7;
-    }
-}
-
-async fn write_utf(buf: &mut Vec<u8>, string: &[u8], len: usize) {
-    if string.len() > len {
-        panic!(
-            "String too big (was {} bytes encoded, max {})",
-            string.len(),
-            len
-        );
-    }
-    write_varint(buf, string.len() as u32).await;
-    write_bytes(buf, string).await;
-}
-
-async fn write_short(buf: &mut Vec<u8>, n: u16) {
-    buf.write_u16(n).await.unwrap();
-    println!("write_short: {}", n);
-}
+use crate::{connection::Connection, resolver, ServerAddress, packets::{ClientIntentionPacket, ServerboundStatusRequestPacket, ConnectionProtocol}};
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
 
 pub async fn ping_server(address: &ServerAddress) -> Result<(), String> {
     let resolved_address = resolver::resolve_address(&address).await?;
 
     let mut conn = Connection::new(&resolved_address).await?;
 
-    // protocol version is 757
-
-    // client intention packet
-    // friendlyByteBuf.writeVarInt(this.protocolVersion);
-    // friendlyByteBuf.writeUtf(this.hostName);
-    // friendlyByteBuf.writeShort(this.port);
-    // friendlyByteBuf.writeVarInt(this.intention.getId());
-
     println!("resolved_address {}", &resolved_address.ip);
     println!("writing intention packet {}", address.host);
 
-    let mut buf: Vec<u8> = vec![0x00]; // 0 is the packet id for handshake
-    write_varint(&mut buf, 757).await;
-    write_utf(&mut buf, address.host.as_bytes(), 32767).await;
-    write_short(&mut buf, address.port).await;
-    write_varint(&mut buf, 1).await;
+    conn.send_packet(&ClientIntentionPacket {
+        protocol_version: 757,
+        hostname: &address.host,
+        port: address.port,
+        intention: ConnectionProtocol::Status,
+    }).await;
+    conn.send_packet(&ServerboundStatusRequestPacket {}).await;
 
-    let mut full_buffer = vec![];
-    write_varint(&mut full_buffer, buf.len() as u32).await; // length of 1st packet id + data as VarInt
-    full_buffer.append(&mut buf);
-    full_buffer.extend_from_slice(&[
-        1,    // length of 2nd packet id + data as VarInt
-        0x00, // 2nd packet id: 0 for request as VarInt
-    ]);
-
-    conn.stream.write_all(&full_buffer).await.unwrap();
-    conn.stream.flush().await.unwrap();
 
     // log what the server sends back
     loop {
@@ -95,6 +36,4 @@ pub async fn ping_server(address: &ServerAddress) -> Result<(), String> {
             }
         }
     }
-
-    Ok(())
 }