feat(net): Add OpenSSH 2.0 Server Daemon (sshd) and Remote Execution Client (ssh)

include/net/ssh.h

@@ -0,0 +1,50 @@
+#ifndef _NET_SSH_H
+#define _NET_SSH_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#define SSH_DEFAULT_PORT 22
+#define SSH_MAX_SESSIONS 8
+#define SSH_BANNER "SSH-2.0-SUB_OS_SSH_1.0 (Titan-Enterprise)\r\n"
+#define SSH_BUFFER_SIZE 2048
+
+typedef enum {
+    SSH_STATE_DISCONNECTED = 0,
+    SSH_STATE_BANNER_SENT,
+    SSH_STATE_KEX_INIT,
+    SSH_STATE_AUTH_REQUEST,
+    SSH_STATE_AUTHENTICATED,
+    SSH_STATE_CHANNEL_OPEN,
+    SSH_STATE_SHELL_ACTIVE
+} ssh_state_t;
+
+typedef struct ssh_session {
+    uint32_t session_id;
+    char username[32];
+    uint32_t client_ip;
+    uint16_t client_port;
+    ssh_state_t state;
+    bool authenticated;
+    uint64_t connect_time;
+    uint64_t bytes_rx;
+    uint64_t bytes_tx;
+    bool in_use;
+} ssh_session_t;
+
+void sshd_init(void);
+int  sshd_start(uint16_t port);
+int  sshd_stop(void);
+bool sshd_is_running(void);
+uint16_t sshd_get_port(void);
+uint32_t sshd_get_sessions_count(void);
+const ssh_session_t* sshd_get_session(size_t index);
+
+// SSH Remote Execution & Handshake Processor
+int sshd_process_packet(const char* in_data, size_t in_len, char* out_resp, size_t max_resp_len);
+
+// SSH Client Command Runner (e.g. ssh user@host "command")
+int ssh_client_execute(const char* username, const char* password, const char* host, uint16_t port, const char* command, char* out_buf, size_t max_len);
+
+#endif // _NET_SSH_H