From 8bfc6cafb37c0bc3849c64022eea02e2698b8ed3 Mon Sep 17 00:00:00 2001
From: Joshua Goins <josh@redstrate.com>
Date: Thu, 13 Mar 2025 21:11:20 -0400
Subject: [PATCH] Send a message when logging in

---
 src/bin/kawari-world.rs | 28 ++++++++++++++++++++++++++++
 src/ipc.rs              | 12 ++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/src/bin/kawari-world.rs b/src/bin/kawari-world.rs
index e1aa623..44b75ca 100644
--- a/src/bin/kawari-world.rs
+++ b/src/bin/kawari-world.rs
@@ -354,6 +354,34 @@ async fn main() {
                                             "Client has finished loading... spawning in!"
                                         );
 
+                                        // send welcome message
+                                        {
+                                            let ipc = IPCSegment {
+                                                unk1: 0,
+                                                unk2: 0,
+                                                op_code: IPCOpCode::ServerChatMessage,
+                                                server_id: 0,
+                                                timestamp: timestamp_secs(),
+                                                data: IPCStructData::ServerChatMessage {
+                                                    message: "Welcome to Kawari!".to_string(),
+                                                    unk: 0,
+                                                },
+                                            };
+
+                                            let response_packet = PacketSegment {
+                                                source_actor: state.player_id.unwrap(),
+                                                target_actor: state.player_id.unwrap(),
+                                                segment_type: SegmentType::Ipc { data: ipc },
+                                            };
+                                            send_packet(
+                                                &mut write,
+                                                &[response_packet],
+                                                &mut state,
+                                                CompressionType::Oodle,
+                                            )
+                                            .await;
+                                        }
+
                                         // send player spawn
                                         {
                                             let ipc = IPCSegment {
diff --git a/src/ipc.rs b/src/ipc.rs
index ff9d1ef..8607c44 100644
--- a/src/ipc.rs
+++ b/src/ipc.rs
@@ -83,6 +83,8 @@ pub enum IPCOpCode {
     GameMasterCommand = 0x3B3,
     // Sent by the server to modify the client's position
     ActorSetPos = 0x223,
+    // Sent by the server when they send a chat message
+    ServerChatMessage = 0x196,
 }
 
 #[binrw]
@@ -430,6 +432,15 @@ pub enum IPCStructData {
     },
     #[br(pre_assert(false))]
     ActorSetPos(ActorSetPos),
+    #[br(pre_assert(false))]
+    ServerChatMessage {
+        unk: u8, // channel?
+        #[brw(pad_after = 775)]
+        #[br(count = 775)]
+        #[br(map = read_string)]
+        #[bw(map = write_string)]
+        message: String,
+    },
 }
 
 #[binrw]
@@ -488,6 +499,7 @@ impl IPCSegment {
                 IPCStructData::ChatMessage { .. } => 1056,
                 IPCStructData::GameMasterCommand { .. } => todo!(),
                 IPCStructData::ActorSetPos { .. } => 24,
+                IPCStructData::ServerChatMessage { .. } => 776,
             }
     }
 }