feat: Sockets, user-mode networking, IRC client application

kernel/src/Net/Socket.hpp

@@ -0,0 +1,54 @@
+/*
+    * Socket.hpp
+    * Socket descriptor table for userspace TCP access
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+#include <Net/Tcp.hpp>
+
+namespace Net::Socket {
+
+    static constexpr int SOCK_TCP = 1;
+    static constexpr int SOCK_UDP = 2;
+    static constexpr int MAX_SOCKETS = 64;
+
+    struct SocketEntry {
+        bool     Active;
+        int      Type;
+        int      OwnerPid;
+        Tcp::Connection* TcpConn;
+        uint16_t LocalPort;
+    };
+
+    void Initialize();
+
+    // Create a socket of the given type. Returns fd or -1.
+    int Create(int type, int pid);
+
+    // Connect socket fd to remote ip:port. Returns 0 or -1.
+    int Connect(int fd, uint32_t ip, uint16_t port, int pid);
+
+    // Bind socket fd to a local port. Returns 0 or -1.
+    int Bind(int fd, uint16_t port, int pid);
+
+    // Start listening on a bound socket. Returns 0 or -1.
+    int Listen(int fd, int pid);
+
+    // Accept an incoming connection. Returns new fd or -1.
+    int Accept(int fd, int pid);
+
+    // Send data on a connected socket. Returns bytes sent or -1.
+    int Send(int fd, const uint8_t* data, uint32_t len, int pid);
+
+    // Receive data from a connected socket. Returns bytes received, 0 on close, or -1.
+    int Recv(int fd, uint8_t* buf, uint32_t maxLen, int pid);
+
+    // Close a socket.
+    void Close(int fd, int pid);
+
+    // Close all sockets owned by a process (called on process exit).
+    void CleanupProcess(int pid);
+
+}