scanner.py

import socket
import sys
import csv
from datetime import datetime

target_host = "scanme.nmap.org"
ports_to_scan = [21,22,23,25,53,80,110,139,443,445,3306,8080]

scan_results = []

print("-" * 60)
print(f"Scanning Target: {target_host}")
print(f"Time Started: {str(datetime.now())}")
print("-" * 60)

try:
    for port in ports_to_scan:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(3)
        result = s.connect_ex((target_host, port))
        if result == 0:
            banner = "Unknown"
            try:
                s.send(b"HEAD / HTTP/1.1\r\nHost: scan.nmap.org\r\n\r\n")
                banner_data = s.recv(1024).decode('utf-8', errors='ignore').strip()
                if banner_data:
                    banner = banner_data.split("\n")[0]
            except Exception:
                banner = "No banner response / timed out"

                    
            print(f"[+] Port {port:<5} : OPEN | Service: {banner}")
            scan_results.append({"Port" : port, "Status": "OPEN", "Banner": banner})
        else:
            print(f"[-] Port {port:<5} : CLOSED")
            scan_results.append({"Port" : port, "Status": "CLOSED", "Banner" : "N/A"})

        s.close()

except KeyboardInterrupt:
    print("\n[!] Scan interrupted by user.")
    sys.exit()

except socket.gaierror:
    print("\n[!] hostname could not be resolved.")    
    sys.exit()

except socket.error:
    print("\n[!] Could not connect to server.")
    sys.exit()

csv_filename = "scan_results.csv"
with open(csv_filename, mode='w', newline='', encoding='utf-8') as csv_file:
    fieldnames = ["Port", "Status", "Banner"]
    writer = csv.DictWriter(csv_file, fieldnames=fieldnames)
    writer.writeheader()
    writer.writerows(scan_results)

print("-" * 60)
print(f"Scan Completed: {str(datetime.now())}")
print(f"Results saved successfully to {csv_filename}")
print("-" * 60)