acrosync-library

Acrosync is a new cross-platform rsync client for Windows/Max/iOS/Android that we built from scratch, without taking any code from the open source rsync project.

This is the library behind Acrosync, which implements a large portion of the client-side of the (undocumented) rsync protocol, including the famous delta sync algorithm.

PhotoBackup, our iOS app for uploading photos and videos to computers, uses a slightly modified version of this library.

##Features

• Talks the rsync protocol version 29 (rsync 2.6.4+) and version 30 (rsync 3.x.x).
• Written in C++ and builds on Win32, Mac OS X, Linux, iOS, and Android.
• The only dependencies are libssh2 and openssl.
• Can connect to the rsync server either via ssh, or via the rsync daemon protocol.
• For ssh connections, supports both password login and public key authentication (with or without a passphrase).
• Symbolic links are supported.

Build Instructions

First you'll need to install openssl and libssh2. Assume we're on a linux machine and these two packages are already installed in the default locations.

Run the following command to build the test programs:

$ python qi/qi-make.py test

You will find a new executable build-linux/rsync/t_rsync_client which can download a remote directory using the rsync over ssh protocol:

$ build-linux/rsync/t_rsync_client <server> <username> <password> <remote dir> <local dir>

The same build command works for Mac and Windows, but you will need to install openssl and libssh2 to a subdirectory named install-mac or install-win under the top level directory.

Here the build system is written with Qi-Make, a tool that we developed by extending the basic syntax of make. The file qi/qi_build.h contains actual rules for building intermediate objects and final test programs. It should be fairly easy to make changes for your own build environments.

##License

This library is licensed under the Reciprocal Public License. If this license does not work for you, a commercial license is available for a one-time fee or on a subscription basis. Contact software2015@acrosync.com for licensing details.