请注意，这个Pardiff VPN是很多年前我不是很懂web的时候做的，我觉得不是很适合作为生产环境使用，小心谨慎

ParDiff VPN source code

Features of ParDiff VPN includes,

• Generic password for OpenVPN, PPTP, Web Login
• Charge users by traffic
• Detailed recording system
• Price/Usage separated
• Usage can be sold as voucher/SN, xtremely easy to manage
• Graphic report system
• Massive mail-out system
• Support system (ticket system)

It is consisted of the following several components,

• static web site
• database schema - store all billing information
• cronjobs - generate usage accounting, aggregation, reporting, monitoring traffic
• init scripts - mainly security settings, protect system from hacker attack or inappropriate user activities
• cgi interfaces

• admin interface
• user interface

• interface with AliPay API (not released yet)
• scripts to generate/remove/manage credit points

To be functioning, administrators are required to install the following packages. They are packaged separately to avoid license issue. They are NOT part of this software.

• modified openvpn and pptp plugins