DreamTunnel

·286条评论

开发背景

在开发过程中，免不了要接收第三方通知。

比较典型的，就是在做电子商务时的各种支付网关的推送通知，还有接收微信的推送通知。

接收通知需要公网地址，但是目前的民用网络，是没有公网地址的，这给调试开发带来了很多麻烦。

一些下载软件，例如著名的BT下载，eMule下载等P2P下载工具，也是需要公网地址才能达到最高速，传统方法是通过UPnP来做端口映射。以前的电信是有公网地址的，通过UPnP是可以解决问题，但是现在电信也不分配公网地址了，所以这种方法也随之失效了。迅雷也通过中转服务器，离线服务器等来实现高速下载的。

细心的读者可能发现了，这个项目就是做DreamWeixin之前所必须解决的首要问题。

可以说，没有DreamTunnel就没有DreamWeixin。

数据转发

由于多年的专业路由器、可编程式路由器的操作经验，使我对网络有一定的了解。

项目的关键，就在于数据的转发，也类似于路由器的NAT操作（两种NAT方式这里不讨论）。

实际操作上还是比较复杂的。

而主要原因，就在于路由器的NAT操作是在内网的，路由器可以直接访问到主机，直接做转发还是很方便的。但是我利用的是境外服务器，服务器不在内网，远在美国，甚至还要通过电信→电信内网→路由器，经过重重路障才可以到达目标主机。

通讯加密

因为众所周知的原因，境外网络数据是经过审核的。

虽然我并不发布或接收敏感信息，但数据一多，难免会被误判。

一旦被判断为敏感信息，轻则中断连接几分钟到几小时，重则直接封IP。

为避免这些不必要的麻烦，服务端与客户端的通讯是全程加密的。

项目演示

CS架构的项目，且属于纯命令行项目，不方便在线演示，可现场演示。

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