1 files changed, 64 insertions, 20 deletions

diff --git a/src/Connection.zig b/src/Connection.zig
index 95805de..19be710 100644
--- a/src/Connection.zig
+++ b/src/Connection.zig
@@ -1,36 +1,80 @@
+// Copyright 2026 Robby Zambito
+//
+// This file is part of zaprus.
+//
+// Zaprus is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// Zaprus is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with
+// Zaprus. If not, see <https://www.gnu.org/licenses/>.
+
 socket: RawSocket,
 headers: EthIpUdp,
 connection: SaprusMessage,
 
 const Connection = @This();
 
-pub fn init(socket: RawSocket, headers: EthIpUdp, connection: SaprusMessage) Connection {
-    return .{
-        .socket = socket,
-        .headers = headers,
-        .connection = connection,
-    };
-}
-
-pub fn next(self: Connection, io: Io, buf: []u8) ![]const u8 {
-    _ = io;
-    log.debug("Awaiting connection message", .{});
-    const res = try self.socket.receive(buf);
-    log.debug("Received {} byte connection message", .{res.len});
-    const msg: SaprusMessage = try .parse(res[42..]);
-    const connection_res = msg.connection;
-
-    log.debug("Payload was {s}", .{connection_res.payload});
-
-    return connection_res.payload;
+// 'p' as base64
+const pong = "cA==";
+
+/// Attempts to read from the network, and returns the next message, if any.
+///
+/// Asserts that `buf` is large enough to store the message that is received.
+///
+/// This will internally process management messages, and return the message
+/// payload for the next non management connection message.
+/// This function is ignorant to the message encoding.
+pub fn next(self: *Connection, io: Io, buf: []u8) ![]const u8 {
+    while (true) {
+        log.debug("Awaiting connection message", .{});
+        const res = try self.socket.receive(buf);
+        log.debug("Received {} byte connection message", .{res.len});
+        const msg = SaprusMessage.parse(res[42..]) catch |err| {
+            log.err("Failed to parse next message: {t}\n{x}\n{x}", .{ err, res[0..], res[42..] });
+            return err;
+        };
+
+        switch (msg) {
+            .connection => |con_res| {
+                if (try con_res.management()) |mgt| {
+                    log.debug("Received management message {t}", .{mgt});
+                    switch (mgt) {
+                        .ping => {
+                            log.debug("Sending pong", .{});
+                            try self.send(io, .{ .management = true }, pong);
+                            log.debug("Sent pong message", .{});
+                        },
+                        else => |m| log.debug("Received management message that I don't know how to handle: {t}", .{m}),
+                    }
+                } else {
+                    log.debug("Payload was {s}", .{con_res.payload});
+                    return con_res.payload;
+                }
+            },
+            else => |m| {
+                std.debug.panic("Expected connection message, instead got {x}. This means there is an error with the BPF.", .{@intFromEnum(m)});
+            },
+        }
+    }
 }
 
-pub fn send(self: *Connection, io: Io, buf: []const u8) !void {
+/// Attempts to write a message to the network.
+///
+/// Clients should pass `.{}` for options unless you know what you are doing.
+/// `buf` will be sent over the network as-is; this function is ignorant of encoding.
+pub fn send(self: *Connection, io: Io, options: SaprusMessage.Connection.Options, buf: []const u8) !void {
     const io_source: std.Random.IoSource = .{ .io = io };
     const rand = io_source.interface();
 
     log.debug("Sending connection message", .{});
 
+    self.connection.connection.options = options;
     self.connection.connection.payload = buf;
     var connection_bytes_buf: [2048]u8 = undefined;
     const connection_bytes = self.connection.toBytes(&connection_bytes_buf);