Differences

This shows you the differences between two versions of the page.

@@ Line 1: / Line 1: @@
+====== Port Scanner ======
+<file c++ port_scanner.cc>
+#include <cstdlib>
+#include <iomanip>
+#include <iostream>
+#include <SFML/Network.hpp>
+#include <sstream>
+#include <string>
+#include <vector>
+static bool port_is_open(const std::string& address, int port)
+{
+    return (sf::SocketTCP().connect(address, port) == sf::Socket::Done);
+}
+static std::vector<std::string> split(const std::string& string,
+                                      char delimiter = ' ',
+                                      bool allow_empty = false)
+{
+    std::vector<std::string> tokens;
+    std::stringstream sstream(string);
+    std::string token;
+    while (std::getline(sstream, token, delimiter)) {
+        if (allow_empty || token.size() > 0)
+            tokens.push_back(token);
+    }
+    return tokens;
+}
+static int string_to_int(const std::string& string)
+{
+    std::stringstream sstream(string);
+    int i;
+    sstream >> i;
+    return i;
+}
+template <typename T>
+static void swap(T& a, T& b)
+{
+    T c = a;
+    a = b;
+    b = c;
+}
+template <typename T>
+static std::vector<T> range(T min, T max)
+{
+    if (min > max)
+        swap(min, max);
+    if (min == max)
+        return std::vector<T>(1, min);
+    std::vector<T> values;
+    for (; min <= max; ++min)
+        values.push_back(min);
+    return values;
+}
+static std::vector<int> parse_ports_list(const std::string& list)
+{
+    std::vector<int> ports;
+    for (const std::string& token : split(list, ',')) {
+        std::vector<std::string> strrange = split(token, '-');
+        switch (strrange.size()) {
+            case 0: ports.push_back(string_to_int(token));       break;
+            case 1: ports.push_back(string_to_int(strrange[0])); break;
+            case 2:
+            {
+                int min = string_to_int(strrange[0]),
+                    max = string_to_int(strrange[1]);
+                for (int port : range(min, max))
+                    ports.push_back(port);
+                break;
+            }
+            default:
+                break;
+        }
+    }
+    return ports;
+}
+template <typename T>
+static T maximum(const std::vector<T>& values)
+{
+    T max = values[0];
+    for (T value : values) {
+        if (value > max)
+            max = value;
+    }
+    return max;
+}
+template <typename T>
+static size_t digits(T value)
+{
+    size_t count = (value < 0) ? 1 : 0;
+    if (value == 0)
+        return 0;
+    while (value) {
+        value /= 10;
+        ++count;
+    };
+    return count;
+}
+int main(int argc, char* argv[])
+{
+    std::string address;
+    std::vector<int> ports;
+    if (argc == 3) {
+        address = argv[1];
+        ports = parse_ports_list(std::string(argv[2]));
+    } else {
+        std::string port_list;
+        std::cout << "Address: " << std::flush;
+        std::getline(std::cin, address);
+        std::cout << "Port: " << std::flush;
+        std::getline(std::cin, port_list);
+        ports = parse_ports_list(port_list);
+    }
+    std::cout << "Showing open ports on " << address << "...\n";
+    size_t width = digits(maximum(ports));
+    for (int port : ports) {
+        if (port_is_open(address, port))
+            std::cout << "Port " << std::setw(width) << port << " : OPEN\n";
+    }
+    std::cout << std::flush;
+    return 0;
+}
+</file>

Trace:

Differences

Search