Python 3 simple port scanner

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I wrote a simple python port scanner today and I would like to get some advice on how to improve on the code in different ways. I am aware that I can implement threading to reduce runtime but I won't for now as it feels a bit advanced at this time.

You can find the code on my GitHub. I am aware that the logging is a bit redundant as it doesn't log anything now, I simply forgot to remove it. You don't close your sockets and connections. The best way to ensure you close them is with a context manager with -statement.

You can also reuse the socket you make, and connect it to other ports. This would make a SocketConnection :. Caveat: I don't know a lot about socket programming. I just used the python documentation, so there might be socket-related bugs. This would also work with an async model as the dictionary is a hash and won't store a key more than once. You could add a socket. Use argparse or sys. You could add a range of ports to the port scanner instead of creating a SConnect for every port.

One weakness of this approach is the sequential nature - by trying ports consecutively, we have to wait for a connect to fail before beginning the next one. This can take a while, particularly for hosts with "blackhole" firewall rules that drop incoming packets rather than replying with a connection-refused status.

To open TCP connections asynchronously, you'll want to read the Creating connections section of the asyncio documentation.

Sockets Tutorial with Python 3 part 1 - sending and receiving data

Don't expect to be able to begin the opening of all ports at once, because most OSes have a limit on the number of open socket descriptors - start with a hundred or so, then throttle so that you then only open a new one when you get a result back and close a candidate.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

python 3 simple port scanner

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm a beginner to python and i'm learning the socket objects in python.

I found out a script on the internet that is:. But it is just a toy, you can not use it for something real, if you want scan the ports of other's computer, try nmap. Here is my version of your port scanner. I tried to explain how everything works in the comments. Learn more. Port Scanner python script Ask Question. Asked 5 years, 3 months ago. Active 2 years, 4 months ago. Viewed 2k times. Thanks alot!

It can certainly "scan" one TCP port on one host. Active Oldest Votes.

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This means, the code that i posted, cannot run on other's computer? What if i place an external ip of a friend of mine with his permission and try to test his ports from my computer? First,the code can run anywhere with Python. Second, you can change the host value and the code can scan the ports of the host. If the connection is a success we can safely assume the host is up and listing on port x. If the connection fails for any other reason we assume the host is down and the port is closed.

This is useful to support, for example, asynchronous connects. The underlying system resource e.

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Once that happens, all future operations on the socket object will fail. The remote end will receive no more data after queued data is flushed.Using the socket library in Python, it is fairly easy to whip up a simple port scanner, as you can see below. As this is a short enough script, I'll go over it piece by piece so that hopefully everyone will understand what it does. This bit of the script just imports the socket library, which allows the rest of the code to actually make the connections.

These two lines setup the lists for the hosts we will scan, as well as the ports that we will check for each host. If we wanted to scan more ports or hosts, then we could add those values to these lists or create them via a range.

python 3 simple port scanner

The first two lines of this section set up our loops. The application will first perform the scan on each host in the list one by one. For each host, the application will loop through the port list, before continuing on to the next host. The third line just sets up our code for exception handling, for when we run into any errors with our socket connections. Up next we display what host and port we are attempting to connect to.

After that, we set up our actual socket that we will use to make the connections. Additionally, once we create this socket, we can set the timeout 5 seconds in this example to speed up the scanning a bit. The script then attempts to connect to the host, and returns a numeric value as the response. If the result from the connection was a 0 value, then it means the connection was successful, and the script prints out that the port is open. Any other value indicates an error of some sort generally the port being closedand could be handled on a case by case basis.

Once we have our result, we can close the socket. This prevents any connection issues or socket reuse errors in future connections. The last two lines are to catch any exceptions from our initial "try" before we started making socket connections. That said, if any exceptions actually occur, then the application ignores them and execution continues. This is far from best practice exceptions should at the very least be output in generalbut is fine for this simple script.

Some of the next steps for this program would be to handle specific exceptions properly and provide the user with more information though. The code and updates can be found in my GitHub repository. I am looking for a port scanner that scans an IP range e. If you have credentials, then you can use them against the discovered ports.

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python 3 simple port scanner

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But this is too slow, I want to somehow be able to some how close or break code after a period of time of not returning anything. In addition to setting socket timeout, you can also apply multi-threading technique to turbo boost the process. It will be, at best, N times faster when you have N ports to scan.

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Consider setting a timeout instead of a for loop by using socket. One can use threading. Thread and threading. Condition to synchronize port check and spawning new threads. Learn more. Asked 5 years, 6 months ago. Active 7 months ago. Viewed 39k times. So I'm making a port scanner in python Drise 3, 3 3 gold badges 31 31 silver badges 59 59 bronze badges.

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Shane Shane 1 1 gold badge 3 3 silver badges 12 12 bronze badges. Active Oldest Votes. Billy T Billy T 1 1 silver badge 5 5 bronze badges. Dataman Dataman 1, 13 13 silver badges 24 24 bronze badges. Gysi Rrjolli Gysi Rrjolli 21 3 3 bronze badges. This should be a bit faster. If the connection is a success we can safely assume the host is up and listing on port x.

If the connection fails for any other reason we assume the host is down and the port is closed. This is useful to support, for example, asynchronous connects.Becoming a penetration tester is not just merely being able to exploit certain target instantly. Actually, those who have the dependency to rely on tools are usually stamped as script kiddies. Each field of expertise must have levels, it is also called a process, not the least of which is the field of hacking.

In the following article, we will learn about the implementation of a programming language in the field of hacking. Who does not know about Python programming language? Yes, of course you already know. Python is created for general purposes, such desktop applications development with its GUI, web development, and including hacking or penetration testing.

Python has an active community whom some of them are insane, a. Python has also become my favorite programming language since I knew the field of penetration testing. I do not just love it for granted. However, for some reason, in essence, python is a less complex and more efficient programming language. What I mean by that is, it is almost near to human language, is not it? From a novice point of view like mine, Python readability rate is insane.

Ok, enough to overstate python. Now I will explain the point of this article. Here we will learn to create a simple port scanner with verbosity with only 13 lines. On the other hand there are other advantages, i.

This will be easier of course if we can make the port scanner ourself. Quote from the above quotation. Lets do it with practice, open your favorite text editor. Do not waste your time using a high featured IDE to do simple scripting. Just be efficient. I prefer Gedit, rather than the prebuilt Kali Linux text editor, Leafpad. Because of one reason, Gedit supports color highlighting for various programming languages.

Type the following text in your text editor. In the line 1 we need to import module socket in order to use socket function. In line 2 we create a socket object with the syntax:.Calibre has the ability to view, convert, edit, and catalog e-books of almost any e-book format.

The goals include maintaining an active iperf 2 code base code originated from iperf 2. Also added python code to centralize test control Wapiti is a vulnerability scanner for web applications. It use the Python 3 programming language. The main intent of developing this toolkit was to provide the security professional and network administrator with a comprehensive set of Open Source Network Security Tools.

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python 3 simple port scanner

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Download receivesms. Footswitch 2 is a media player for transcription on Linux. Written in python and using the python bindings for VLC it allows a transcriber to control the audio or video with an Infinity footpedal, and includes a set of macros that integrate into LibreOffice.

Control of the media player from LibreOffice can be via Hotkeys or an integrated EasyUpload is a client-server project for uploading images from Android to a PC.Port scanning may be defined as a surveillance technique, which is used in order to locate the open ports available on a particular host.

Network administrator, penetration tester or a hacker can use this technique. We can configure the port scanner according to our requirements to get maximum information from the target system. Port scanning is just like a thief who wants to enter into a house by checking every door and window to see which ones are open. Both of the protocols have 0 to ports. As it always advisable to close unnecessary ports of our system hence essentially, there are more than doors ports to lock.

In our previous chapter, we discussed what a socket is.

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Now, we will build a simple port scanner using socket. When we run the above script, it will prompt for the hostname, you can provide any hostname like name of any website but be careful because port scanning can be seen as, or construed as, a crime. We should never execute a port scanner against any website or IP address without explicit, written permission from the owner of the server or computer that you are targeting.

That is why it is advisable to use port scanner on localhost or your own website if any. The output shows that in the range of 50 to as provided in the scriptthis port scanner found two ports — port andopen. We can change this range and can check for other ports. ICMP is not a port scan but it is used to ping the remote host to check if the host is up.

This scan is useful when we have to check a number of live hosts in a network. Actually in one or other sense, ping sweep is also known as ping sweeping. The only difference is that ping sweeping is the procedure to find more than one machine availability in specific network range.

For example, suppose we want to test a full list of IP addresses then by using the ping scan, i. That is why we need to use ping sweep script. The above script works in three parts. It first selects the range of IP address to ping sweep scan by splitting it into parts. This is followed by using the function, which will select command for ping sweeping according to the operating system, and last it is giving the response about the host and time taken for completing the scanning process.

The above output is showing no live ports because the firewall is on and ICMP inbound settings are disabled too. After changing these settings, we can get the list of live ports in the range from 1 to provided in the output.

To establish a TCP connection, the host must perform a three-way handshake. In this step, the system that is trying to initiate a connection starts with a packet that has the SYN flag set.