A simple pocket sized port scanner written in Go.
The idea dawned on me when I was solving a HTB machine where you needed to perform a port scan to discover internal networks while running proxychains. So, you either needed a portable nmap binary (found one, but didn't work) or an alternate method. I could not find any simple tool to just upload it to the remote machine and scan ports. There were ps1 and batch scripts, but they were not straight forward to use.
So, here we are. A simple, portable, easy to use port scanner. Also, I wanted to do something with Go.
Note: This is not as efficient as nmap and it does not aim to replace nmap. This tool's purpose is to be your emergency port scanner when you don't have access to nmap.
go run gps.go
-i IP address to scan. Default is localhost.
-t Number of threads to use for scanner. The input values get divided accordingly and each thread gets equal number of ports to scan. Default is 20.
-v Verbose output (currently kinda useless and I used it to debug). If true, shows failed connections too. Default is false.
-d Delay/Timeout time for each connection in milliseconds. Default is 700ms.
-p Ports to scan. Default value (empty field) scan will use nmap top 1000 ports.
Custom ports example: 21,22,53,... etc.
-h Displays these options.
- Add port range scans
- Clean the code and make it more readable (currently looks like a rushed job (which it was))
- Add pre-built Linux and Windows binaries
- Research on how to improve the performance more. (Maybe apply some of them OOP patterns?)
- Add UDP maybe?
- Colors?
When? Later.