gotunnel is a secure tcp tunnel software. It can use tcp or udp connectioin as low level tunnel.
gotunnel could be added to any c/s system using tcp protocol. Make system structure evolve from
client <--------------> server
client <-> gotunnel <--------------> gotunnel <-> server
to gain gotunnel's valuable features, such as secure and persistent.
go install github.com/xjdrew/gotunnel
usage: bin/gotunnel -backend string backend address (default "127.0.0.1:1234") -listen string listen address (default ":8001") -log uint log level (default 1) -secret string tunnel secret (default "the answer to life, the universe and everything") -timeout int tunnel read/write timeout (default 3) -tunnels uint low level tunnel count, 0 if work as server
- secret: for authentication and exchanging encryption key
- tunnels: 0 means gotunnel will and as server; Any value larger than 0 means gotunnel will work as client, and build tunnels tcp connections to server.
- timeout: if can't read a packet body in timeout seconds, will recreate this tunnel. It's useful if theres is a critical firewall between gotunnel client and server.
Suppose you have a squid server, and you use it as a http proxy. Usually, you will start the server:
$ squid3 -a 8080
and use it on your pc:
curl --proxy server:8080 http://example.com
It works fine but all traffic between your server and pc is plaintext, so someone can monitor you easily. In this case, gotunnel could help to encrypt your traffic.
First, on your server, resart squid to listen on a local port, for example 127.0.0.1:3128. Then start gotunnel server listen on 8080 and use 127.0.0.1:3128 as backend.
$ ./gotunnel -listen=:8001 -backend=127.0.0.1:3128 -secret="your secret" -log=10
Second, on your pc, start gotunnel client:
$ ./gotunnel -tunnels=100 -listen="127.0.0.1:8080" -backend="server:8001" -secret="your secret" -log=10
Then you can use squid3 on you local port as before, but all your traffic is encrypted.
Besides that, you don't need to create and destory tcp connection between your pc and server, because gotunnel use long-live tcp connections as low tunnel. In most cases, it would be faster.
The MIT License (MIT)
Copyright (c) 2015 xjdrew