RCPD

This is a modern re-implementation of rcp (remote copy protocol) daemon, originally part berkeley r-commands.

Motivation

Easily copy files between vintage computer clients and a modern server/NAS. The r-commands are ubiquitous on old operating systems, even Windows NT. Also rcp is NAT/QEMU/Docker frienly as it uses only a single TCP port, unlike for example ftp or tftp.

In recent years both r-daemons and inetd have been deprecated on modern OSes, leaving little alternatives.

Implementation

This implementaion of rcpd is fully self contained, stand-alone, statically linked binary, with zero dependencies. Doesn't require rshd, inetd, shell or anything else. It can be run as a Docker container with ease.

Security considerations

This implementation is fully open, with no security what so ever. Ignoring user names, authentication, .rhosts, /etc/hosts.equiv and all that nonsense. It's intended to be used on a secure LAN only.

Usage

Server

./rcpd -root_dir=/some/path

The server must bind to port 514/tcp, which may require elevated privileges.

Docker

https://hub.docker.com/r/tenox7/rcpd

Inside docker container root dir is /srv:

docker run -d --name rcpd -v /some/dir:/srv -p 514:514 tenox7/rcpd:latest

Client

Just like scp:

rcp host:/dir/file.txt .
rcp file.txt host:
rcp file.txt host:/path

Legal

• This code has been writen entirely by Claude
• License: Public Domain