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# µcp/ucp: µTP copy (very remote file transfer)
This is basically a clone of SSH's scp command that uses the µTP (the Micro
Transport Protocol) over UDP instead of passing data through the TCP SSH
connection. SSH (and TCP) is used for authentication and setup, just like
`mosh` does; the server-side ucp process is not a daemon and is not running
continuously.
The motivation for this tool is to get better bandwidth utilization over
high-latency links with mild packet loss, while remaining well-behaved netizen.
Just like `scp`, this program is based on the old `rcp` "protocol" and is very
simple. There is no session resumption, or extra checksums or integrity checks,
support for file metadata beyond old-school UNIX permissions, or anything like
that. There is a bunch of overhead sending small files, so if you have a lot of
those and a high-latency link you should probably `tar` things up first. There
also isn't any compression, so you might want to `gzip` that tarball.
### Dependencies
You need the Sodium (wrapper for NaCl) library and headers installed. On Linux,
this is, eg, libsodium-dev.
Uses sodiumoxide instead of rust-crypto because there aren't online docs for
rust-crypto, and AFAIK Sodium and NaCl have been reviewed and rust-crypto has
not.
Uses rustc-serialize instead of serde, because serde seems more complicated
(both nightly/compiler API and a non-macro API?) and doesn't seem to support
base64.
### Usage
The command must be installed on both the local and remote machines.
To send a local file named `insurance.aes256` to the home directory of `robin`
on `files.the-nsa.org`:
ucp insurance.aes256 robin@files.the-nsa.org:
To copy a complete directory of files from the directory "~/everything/" on the
remote server to a new folder `/tmp/img/` locally:
ucp -r robin@files.the-nsa.org:everything /tmp
### rcp Protocol
The `rcp` protocol is described in a
[Jul 09, 2007 blog post by janp](https://blogs.oracle.com/janp/entry/how_the_scp_protocol_works),
which is mirrored as text in the `doc` folder of this repo.
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