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fqrouter released under the terms of GPL v3.0

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fqrouter's Issues

Linux本机使用的单向代理

使用TCP Hole Punching开NAT洞
用单向代理转发上行流量
用TCP或者UDP包过滤避免DNS污染
打包成socks代理的形式给本地应用使用
python编写

评估穿墙方式的现状

穿墙方式是指不依赖于客户端与服务器之外的第三个EndPoint帮助实现的的翻墙。但是会对网络中的路由器有一定依赖。
Overlapped IP Fragmentation
TTL Injection Same Sequence TCP Packet
TCP Connection State Obfuscation
Unidirectional IP Packet Proxy
Drop Invalid DNS Answer

帮助client建立好TCP连接

收到client发出的SYN之后，记录下来，然后DROP掉。用raw socket帮助client建立好TCP连接，然后再给client返回SYN+ACK继续TCP连接过程。SEQ号需要-1，因为要额外多发一个ACK包。

用lua编写smuggler

需要用到
提供nfqueue接口：nfq.so
提供tcp/ip协议封装：nmap:nselib => bit.so

执行probe

按照probe request的要求，发送带有错误ACK号的SYN+ACK包以指定src和sport发送给指定dst和dport。

异步重发SYN

当outbound端口确定之后，用UDP重发TCP的初始SYN，以克服IP封锁

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