[김필모] 10주차 미션 제출 (#117)

8th_members/김필모/10주차.md

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+# Port Scanner 예제 실행해보기
+
+### 싱글 프로세스 + 싱글 스레드
+```python3
+from queue import Queue
+import socket
+import time
+
+timeout = 1.0
+
+def check_port(host: str, port: int, results: Queue):
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.settimeout(timeout)
+    result = sock.connect_ex((host, port))
+    if result == 0:
+        results.put(port)
+    sock.close()
+
+def main():
+    start = time.time()
+    host = "localhost" # Replace with a host you own 
+    results = Queue()
+    for port in range(30000, 65536):
+        check_port(host, port, results) 
+    while not results.empty():
+        print("Port {0} is open".format(results.get())) 
+    print("Completed scan in {0} seconds".format(time.time() - start))
+
+if __name__ == '__main__':
+    main()
+```
+<img width="831" alt="Screenshot 2024-06-30 at 2 44 52 PM" src="https://github.com/why-arong/CPython-Guide/assets/68311908/2860fa95-7d0c-447b-815a-f0e3effb4fd2">
+
+
+### 멀티스레딩
+
+
+```python3
+from threading import Thread
+from queue import Queue
+import socket
+import time
+
+timeout = 1.0
+
+def check_port(host: str, port: int, results: Queue):
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.settimeout(timeout)
+    result = sock.connect_ex((host, port))
+    if result == 0:
+        results.put(port)
+    sock.close()
+
+def main():
+    start = time.time()
+    host = "localhost" # Replace with a host you own
+    threads = []
+    results = Queue()
+    for port in range(30000, 65536):
+        t = Thread(target=check_port, args=(host, port, results))
+        t.start()
+        threads.append(t)
+    for t in threads:
+        t.join()
+    while not results.empty():
+        print("Port {0} is open".format(results.get()))
+    print("Completed scan in {0} seconds".format(time.time() - start))
+
+if __name__ == '__main__':
+     main()
+```
+<img width="894" alt="Screenshot 2024-06-30 at 2 45 36 PM" src="https://github.com/why-arong/CPython-Guide/assets/68311908/1af4f0cd-182c-4474-949e-b58c2ebd388b">
+
+
+### 멀티스레딩 + 스레드 개수 제한
+```python3
+import socket
+import time
+from concurrent.futures import ThreadPoolExecutor, as_completed
+from queue import Queue
+
+timeout = 1.0
+
+
+def check_port(host: str, port: int) -> int:
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
+        sock.settimeout(timeout)
+        result = sock.connect_ex((host, port))
+        if result == 0:
+            return port
+    return None
+
+
+def main():
+    start = time.time()
+    host = "localhost"  # Replace with a host you own
+    open_ports = []
+
+    with ThreadPoolExecutor(max_workers=50) as executor:
+        futures = [executor.submit(check_port, host, port)
+                   for port in range(30000, 65536)]
+
+        for future in as_completed(futures):
+            port = future.result()
+            if port is not None:
+                open_ports.append(port)
+
+    for port in open_ports:
+        print(f"Port {port} is open")
+    print(f"Completed scan in {time.time() - start:.2f} seconds")
+
+
+if __name__ == '__main__':
+    main()
+
+```
+
+<img width="871" alt="Screenshot 2024-06-30 at 2 46 34 PM" src="https://github.com/why-arong/CPython-Guide/assets/68311908/74eb275c-56ad-4307-84fe-6395b388ddc1">
+
+