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README
LGPL-3.0

mysync - 单向同步软件

关于 v3.1.1

以很小的代价消除了上一版本的副作用。同时改进了客户端,减少了计算量。

关于 v3.1.0

该版本和 v3.0.1 兼容,改进之处:服务端使用文件 _desc.json 保存各个文件的 MD5

  • 优点是:免去了每次同步时的重复计算,当目录中有大文件时,明显减轻了服务器负担。
  • 副作用:如果手动改动了服务端的文件,必须删除 _desc.json,否则服务器无法感知文件的改变。

项目介绍

这是基于RSA、AES256加密验证的单向同步软件,从客户端同步到服务端,自动跳过第一级目录中以._开头的文件和目录。

服务器和客户端的通讯使用TLS安全连接进行RPC调用。

源代码地址

百度网盘下载

https://pan.baidu.com/s/103cgeSFOmPZFvVZOQYdDPw

算法说明

  • 首先由客户端获取本地目录的文件列表,并且逐一计算各个文件的MD5值,然后把文件名、MD5列表发送到服务器。
  • 接着服务器也计算服务器上的文件、MD5列表,根据各个文件的MD5与客户端上传的列表进行比较,找出被客户端修改、新增、删除了的文件,然后删除已被客户端删除的文件,并且向客户端返回修改、新增文件列表。
  • 最后客户端把已经修改、新增的文件压缩打包后上传到服务器,服务器解开压缩包,更新服务器上的文件夹内容。

系统构架

本软件有4个程序构成:

  1. mysyncd - 服务端程序,可以使用参数改变端口,查询参数:mysyncd -h
  2. mysync - 客户端程序。
  3. genca - 生成自签名的TLS证书对servername-cert.pem、servername-key.pem,用法参考:genca -h
  4. genkey - 生成一对RSA2048密钥name.pubname.key,用法:genkey -k name

配置文件路径

  • 服务器:在Linux系统上是:HOME/config/mysyncd/;在Windows系统上是:/path/to/mysyncd/config/mysyncd/
  • 客户端:在需要同步的目录中的子目录 _mysync

配置TLS证书:

  1. genca程序生成servername-cert.pem、servername-key.pem
  2. 服务端:把servername-cert.pem、servername-key.pem复制到config/mysyncd/rootcas,改名为cert.pem、key.pem
  3. 客户端:把servername-cert.pem复制到_mysync中,改名为cert.pem

配置服务器mysyncd

把客户端RSA公钥mykey.pub复制到config/mysyncd目录中,编辑对应的mykey.json文件指明同步目录, 注意JSON文件和.pub文件的名字是一一对应的。mykey名字可以改变,和客户端的配置相对应。默认绑定地址为":6080",可使用mysyncd程序的参数host改变,参数格式:-host IP:PORT

服务端可以配置多对mykey.pub、mykey.json

配置客户端mysync

把客户端的RSA私钥mykey.key复制到_mysync目录中,编辑配置文件config.json指明 服务器地址host,标识符key,标识符必须和服务器上的.pub.json文件前面的名字以及本地的私钥文件.key文件的名字相同。

服务端配置目录结构

config/mysyncd/
├── mykey.json
├── mykey.pub
└── rootcas
    ├── cert.pem
    └── key.pem

客户端配置文件结构

_mysync/
├── cert.pem
├── config.json
└── mykey.key
GNU LESSER GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. [http://fsf.org/] Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. This version of the GNU Lesser General Public License incorporates the terms and conditions of version 3 of the GNU General Public License, supplemented by the additional permissions listed below. 0. Additional Definitions. As used herein, "this License" refers to version 3 of the GNU Lesser General Public License, and the "GNU GPL" refers to version 3 of the GNU General Public License. "The Library" refers to a covered work governed by this License, other than an Application or a Combined Work as defined below. An "Application" is any work that makes use of an interface provided by the Library, but which is not otherwise based on the Library. 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