Return ERR_INPUTTOOLONG instead of closing connection on messages lon…

…ger than ~1020 bytes

As recommended by https://ircv3.net/specs/extensions/message-tags#size-limit

client_listener/Cargo.toml

@@ -8,6 +8,7 @@ edition = "2018"
 [dependencies]
 sable_macros = { path = "../sable_macros" }
 sable_ipc = { path = "../sable_ipc" }
+bincode = "1.3"
 tracing = "0.1"
 thiserror = "1"
 serde = { version = "1", features = [ "derive" ] }

client_listener/src/error.rs

@@ -13,6 +13,8 @@ pub enum ConnectionError {
     InternalError,
     #[error("Send queue full")]
     SendQueueFull,
+    #[error("Input line was too long")]
+    InputLineTooLong,
 }
 
 /// An error that might occur when configuring a listener.

client_listener/src/internal/connection_task.rs

@@ -51,7 +51,11 @@ where
                 message = lines.next_line() => match message {
                     Ok(None) => { break; },
                     Ok(Some(m)) => {
-                        if self.event_channel.send(InternalConnectionEventType::Event(InternalConnectionEvent::Message(self.id, m))).await.is_err() {
+                        if m.as_bytes().len() as u64 > crate::MAX_MSG_SIZE {
+                            if self.event_channel.send(InternalConnectionEventType::Event(InternalConnectionEvent::ConnectionError(self.id, ConnectionError::InputLineTooLong))).await.is_err() {
+                            tracing::error!("Error notifying socket error on connection {:?}", self.id);
+                            }
+                        } else if self.event_channel.send(InternalConnectionEventType::Event(InternalConnectionEvent::Message(self.id, m))).await.is_err() {
                             tracing::error!("Error notifying socket message on connection {:?}", self.id);
                         }
                     }

sable_ircd/src/messages/numeric.rs

@@ -78,6 +78,7 @@ define_messages! {
     406(WasNoSuchNick)          => { (nick: &Nickname)          => "{nick} :There was no such nickname" },
     410(InvalidCapCmd)          => { (subcommand: &str)         => "{subcommand} :Invalid CAP command" },
     412(NoTextToSend)           => { ()                         => ":No text to send" },
+    417(InputTooLong)           => { ()                         => ":Input line was too long" },
     421(UnknownCommand)         => { (command: &str)            => "{command} :Unknown command" },
     432(ErroneousNickname)      => { (nick: &str)               => "{nick} :Erroneous nickname" },
     433(NicknameInUse)          => { (nick: &Nickname)          => "{nick} :Nickname is already in use." },

sable_ircd/src/server/mod.rs

@@ -336,7 +336,15 @@ impl ClientServer {
                             .await;
                         }
                     }
-                    conn.send(message::Error::new(&e.to_string()));
+                    match e {
+                        ConnectionError::InputLineTooLong => {
+                            conn.send(numeric::InputTooLong::new_for(
+                                &self.node.name().to_string(),
+                                &"*".to_string(),
+                            ))
+                        }
+                        _ => conn.send(message::Error::new(&e.to_string())),
+                    }
                 }
                 self.connections.write().remove(msg.source);
             }