pync

Name

pync - arbitrary TCP and UDP connections and listens (Netcat for Python).

Synopsis

Unix

pync [-46bCDdhklnruvz] [-c string] [-e filename] [-I length]
     [-i interval] [-O length] [-P proxyuser] [-p source_port]
     [-q seconds] [-s source] [-T keyword] [-w timeout]
     [-X proto] [-x addr[:port]]
     [-Y pyfile] [-y pycode] [dest] [port]

Windows

py -m pync [-46bCDdhklnruvz] [-c string] [-e filename] [-I length]
           [-i interval] [-O length] [-P proxyuser] [-p source_port]
           [-q seconds] [-s source] [-T keyword] [-w timeout]
           [-X proto] [-x addr[:port]]
           [-Y pyfile] [-y pycode] [dest] [port]

Python

import pync
args = '''[-46bCDdhklnruvz] [-c string] [-e filename] [-I length]
          [-i interval] [-O length] [-P proxyuser] [-p source_port]
          [-q seconds] [-s source] [-T keyword] [-w timeout]
          [-X proto] [-x addr[:port]]
          [-Y pyfile] [-y pycode] [dest] [port]'''
pync.run(args, stdin, stdout, stderr)

Description

Inspired by the Black Hat Python book, the goal of pync is to create an easy to use library that provides Netcat-like functionality for Python developers.

Common uses include:

• simple TCP proxies
• python-script based HTTP clients and servers
• network daemon testing
• a SOCKS or HTTP ProxyCommand for ssh(1)

Installation

pync should work on any system with Python installed (version 2.7 or higher).

Use Python's pip command to install pync straight from github:

Unix

python -m pip install https://github.com/bw0rth/pync/archive/main.zip

Windows

py -m pip install https://github.com/bw0rth/pync/archive/main.zip

Usage

• Client/Server Model
• Data Transfer
• Talking to Servers
• Port Scanning
• Remote Command Execution
• Remote Code Execution
• pync For Developers

Options

Option	Description
-4	Use IPv4 addresses only
-6	Use IPv6 addresses only
-b	Allow broadcast
-C	Send CRLF as line-ending
-c string	specify shell commands to exec after connect (use with caution).
-D	Enable the debug socket option
-d	Detach from stdin
-e filename	specify filename to exec after connect (use with caution).
-h, --help	show available options and exit.
-I length	TCP receive buffer length
-i secs	Delay interval for lines sent, ports scanned
-k	Keep inbound sockets open for multiple connects
-l	Listen mode, for inbound connects
-n	Suppress name/port resolutions
-O length	TCP send buffer length
-P proxy_username	Username for proxy authentication
-p source_port	Specify local port for remote connects
-q seconds	quit after EOF on stdin and delay of seconds
-r	Randomize remote ports
-s source	Local source address
-T toskeyword	Set IP Type of Service
-u	UDP mode [default: TCP]
-v	Verbose
-w secs	Timeout for connects and final net reads
-X proxy_protocol	Proxy protocol: "4", "5" (SOCKS) or "connect"
-x proxy_address[:port]	Specify proxy address and port
-Y pyfile	specify python file to exec after connect (use with caution).
-y pycode	specify python code to exec after connect (use with caution).
-z	Zero-I/O mode [used for scanning]
dest	The destination host name or ip to connect or bind to
port	The port number to connect or bind to

API Reference

• pync.run
• Netcat
• Clients
• Servers
• Connections

Examples

Example	Description
chat.py	Simple chat protocol with a custom username
upload.py	Simple file upload (use with caution).
download.py	Simple file download (use with caution).
echo.py	Echo client/server
proxy.py	Simple TCP proxy server
pyshell.py	Reverse or bind python interpreter shell (use with caution).
scan.py	Simple TCP connect port scanner
shell.py	Reverse or bind remote system shell (use with caution).
sock.py	Using sockets with pync

See Also

• Netcat man page

Caveats

UDP port scans will always succeed (i.e report the port as open), rendering the -uz combination of flags relatively useless.