feat: adding packet handling to server

sparse-05/sparse-05-server/src/connection.rs

@@ -1,4 +1,5 @@
 use std::{
+    collections::HashMap,
     net::{Ipv4Addr, UdpSocket},
     sync::{
         mpsc::{channel, Receiver, Sender},
@@ -214,6 +215,8 @@ fn authenticate<F: Fn()>(
     handle_full_connection(capabilities, packet_handler, conninfo, close)
 }
 
+mod command;
+
 fn handle_full_connection<F>(
     capabilities: Arc<Capabilities>,
     packet_handler: Receiver<EthernetPacket>,
@@ -223,8 +226,48 @@ fn handle_full_connection<F>(
 where
     F: Fn(),
 {
+    use packets::*;
+
+    let mut commands = HashMap::new();
+    let mut uploaded_files = HashMap::new();
+    let mut downloaded_files = HashMap::new();
+
     loop {
         let msg = packet_handler.recv()?;
+        let pkt = msg.pkt();
+
+        let Layer3Pkt::IPv4Pkt(ip_pkt) = pkt.get_layer3_pkt()?;
+        let Layer4Pkt::UDP(udp_pkt) = ip_pkt.get_layer4_packet()?;
+
+        if ip_pkt.source_ip() != conninfo.srcip || udp_pkt.srcport() != conninfo.srcport {
+            continue;
+        }
+
+        let Ok(data) = conninfo.try_decrypt_and_verify_comm(udp_pkt.get_data()) else {
+            continue;
+        };
+
+        match data {
+            Command::RunCommand(_) => {}
+            Command::SendStdin(_, _) => {}
+
+            Command::Cd(_) => {}
+            Command::Ls(_) => {}
+
+            Command::OpenTTY => {}
+            Command::CloseTTY(_) => {}
+            Command::SendTTYData(_, _) => {}
+            Command::SendTTYSignal(_, _) => {}
+
+            Command::StartUploadFile(_, _) => {}
+            Command::SendFileSegment(_, _, _) => {}
+            Command::StartDownloadFile(_) => {}
+            Command::DownloadFileStatus(_) => {}
+
+            Command::Disconnect => {
+                break;
+            }
+        }
     }
 
     close();