[Add] Implement nmap network scanner.

assets/scripts/bin/nmap.lua

@@ -0,0 +1,9 @@
+-- /bin/nmap - Network exploration tool and security/port scanner.
+local target_ip = arg[1]
+
+if not target_ip then
+  return "nmap: requires a target host to be specified"
+end
+
+-- TODO: Add args such as -sV for version detection etc.
+return { action = "scan", target = target_ip }

client/src/terminal.cpp

@@ -3,6 +3,8 @@
 #include <SDL3/SDL.h>
 #include <GL/glew.h>
 #include <SDL3/SDL_events.h>
+#include <sstream>
+#include <algorithm>
 
 #include "terminal.h"
 #include "client_network.h"
@@ -43,7 +45,21 @@ void Terminal::update(void) {
       _prompt = server_msg.substr(last_newline+1);
       std::string output = server_msg.substr(0, last_newline);
       if(!output.empty()) {
-        _history.push_back(output);
+        /* Split multiline output and push each line to history. */
+        std::stringstream ss(output);
+        std::string line;
+        while(std::getline(ss, line, '\n')) {
+          /* Replace tabs. */
+          std::string line_with_spaces;
+          for(char ch : line) {
+            if(ch == '\t') {
+              line_with_spaces += "   ";
+            } else {
+              line_with_spaces += ch;
+            }
+          }
+          _history.push_back(line_with_spaces);
+        }
       }
     } else {
       /*

common/src/command_processor.cpp

@@ -192,6 +192,24 @@ std::string CommandProcessor::_handle_vfs_action(sol::table action) {
     return "Connection closed.";
   } else if(action_name == "close_terminal") {
     return "__CLOSE_CONNECTION__";
+  } else if(action_name == "scan") {
+    std::string target_ip = action["target"].get_or<std::string>("");
+    if(!_world_vfs.count(target_ip)) {
+      return std::string("nmap: Could not resolve host: ") + target_ip;
+    }
+
+    vfs_node* target_root = _world_vfs[target_ip];
+    if(target_root->services.empty()) {
+      return std::string("No open ports for ") + target_ip;
+    }
+
+    std::stringstream ss;
+    ss<<"Host: "<<target_ip<<"\n";
+    ss<<"PORT\tSTATE\tSERVICE\n";
+    for(auto const& [port, service_name] : target_root->services) {
+      ss<<port<<"/tcp\t"<<"open\t"<<service_name<<"\n";
+    }
+    return ss.str();
   }
   return "Error: Unknown VFS action '" + action_name + "'";
 }

common/src/vfs.h

@@ -24,6 +24,9 @@ struct vfs_node {
   /* Directories. */
   vfs_child_map children;
   vfs_node* parent;
+
+  /* Services (for root nodes). */
+  std::map<int, std::string> services;
 };
 
 std::string get_full_path(vfs_node* node);

common/src/vfs_manager.cpp

@@ -77,6 +77,9 @@ vfs_node* VFSManager::create_vfs(const std::string& system_type) {
   /* Link to the shared directories from the template. */
   root->children["bin"] = copy_vfs_node(_vfs_root->children["bin"], root);
 
+  /* Default services. All machines have SSH currently. */
+  root->services[22] = "SSH v1.2";
+
   if(system_type == "npc") {
     vfs_node* npc_file = new_node("npc_system.txt", FILE_NODE, root);
     npc_file->content = "This guy sucks nuts!";

server/src/network_manager.cpp

@@ -16,6 +16,11 @@ NetworkManager::NetworkManager(void) : _acceptor(_io_context) {
   /* VFS setup. */
   _world_vfs["8.8.8.8"]   = _vfs_manager.create_vfs("npc");
   _world_vfs["10.0.2.15"] = _vfs_manager.create_vfs("npc");
+
+  /* Specific npc services. */
+  _world_vfs["8.8.8.8"]->services[80] = "HTTPD v2.4";
+  _world_vfs["10.0.2.15"]->services[21] = "FTPd v3.0";
+
   fprintf(stderr, "Created world with %zu networks\n", _world_vfs.size());
 }