Golconda

Golconda is a client/server that aim to find reverse port open.

$ ./golconda 
A Fast client / server reverse port discovery made with love.
         Please use it with love too <3.

Usage:
  golconda [command]

Available Commands:
  client      Use client to discover reverse ports.
  help        Help about any command
  server      Use server to listen reverse ports.

Flags:
  -h, --help   help for golconda

Use "golconda [command] --help" for more information about a command.

Examples

Basic

golconda server -p 8080,9000,9001

golconda client -t 127.0.0.1 -p 8080,9000,9001

Port range

golconda server -p 8080-9001

golconda client -t 127.0.0.1 -p 8080-9001

Print client oneliner

golconda client -t 127.0.0.1 -p 8080,9000,9001 -c powershell

Top ports

This option is based on the nmap-services file from: https://github.com/nmap/nmap

golconda client -t 10.10.10.9 --top-ports 100

golconda server --top-ports 100

Exclude ports

This option is based on the nmap-services file from: https://github.com/nmap/nmap

golconda client -t 10.10.10.9 -e 80,22

golconda server --top-ports 100 -e 80,22

Monitor interface

This feature monitor upcoming connections from a target.

Linux

Based on tcpdump, it's not working on Windows now.

golconda server -d -i eth0 -t 10.10.10.10 

Windows

First, get the mac address of the adaptator you want to monitor

ipconfig /all

Then use getmac to list the Windows device name.

Physical Address    Transport Name
=================== ==========================================================
00-FF-78-16-5B-54   Media disconnected
00-FF-1D-D9-30-08   Media disconnected
C0-B8-83-EB-39-E9   \Device\Tcpip_{BE995E05-272D-4004-BD00-48767E71E5FF}
00-50-56-C0-00-01   \Device\Tcpip_{FF430151-6520-4A67-AAF9-82B6A9A3F75A}
00-50-56-C0-00-08   \Device\Tcpip_{DB6EA806-DB19-4E40-BDDA-5ECEADAC1413}
C0-B8-83-EB-39-ED   Media disconnected
00-FF-64-8C-46-01   Media disconnected
00-FF-B2-BC-FF-42   Media disconnected

Change Tcpip to NPF.

golconda.exe server -d -i \Device\NPF_{DB6EA806-DB19-4E40-BDDA-5ECEADAC1413} -t 10.10.10.10 

Manual install

go build

Errors

Too many open files

[-] Error starting listener. listen tcp :XXXXX: socket: too many open files

Check your limit size

$ ulimit -n

Change your limit size

$ ulimit -n 65600

Todo

• New server feature, listening to the network interface to monitor upcoming ports
• Change the top-ports configuration to be more accurate
• Exclusion ports
• Add logging
• Change GetClientCommand to key value strings
• Add Timeout for client DialTimeout function
• Change arguments location, globals placed to root
• Add C oneliner portscanner
• Sleep time between each ports