added port-sniffer to submissions directory

submissions/jyuart/port-sniffer/sniffer.py

@@ -0,0 +1,44 @@
+import socket
+import click
+
+opened_ports = []
+
+def sniff(ip, ports):
+	start_port = int((ports.split("-"))[0])
+	end_port = int((ports.split("-"))[1])
+	for current_port in range(start_port, end_port):
+		s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+		s.settimeout(0.3)
+		result = s.connect_ex((ip, current_port))
+		if result == 0:
+			print(".", end="")
+			opened_ports.append(str(current_port))
+	if not (opened_ports):
+		print("There are no opened ports in this range:", ports)
+	else:
+		print("\n", ((", ").join(opened_ports)), " ports are opened", sep="")
+
+
+@click.command()
+@click.option("--host", metavar="<domain name or ip>", help="it can be either domain name or IP address")
+@click.option("--ports", metavar="<range of numbers>", default="0-65535", help="it should be two integers divided by hyphen")
+def main(host, ports):
+	""" Sniffer is CLI tool which allows user to easily search for opened TCP ports on particular host (using IP adderess or domain)"""
+	sniff(host, ports)
+
+
+try:
+	if __name__ == "__main__":
+		main()
+
+except socket.gaierror:
+	print("This host is not valid. \nIt can be either domain name, like google.com or IP address like 172.217.3.110")
+
+except ValueError:
+	print("Format of either host or ports is incorrect.\nHost should be domain name like google.com or IP like 172.217.3.110.\nPorts should be a range of numbers like 0-80")
+
+except TypeError:
+	print("Parameter host is required. \nIt can be either domain name, like google.com or IP address like 172.217.3.110")
+
+except IndexError:
+	print("You've entered one number.\nThere should be a range of ports divided by hyphen.")