SSH 代理服務器：SSH Piper

SSH Piper 是一款 根可以 根據 ssh 用戶名選擇 目標服務器 的 ssh 代理軟件

+---------+                      +------------------+          +-----------------+
|         |                      |                  |          |                 |
|   Bob   +----ssh -l bob----+   |   SSH Piper   +------------->   Bob' machine  |
|         |                  |   |               |  |          |                 |
+---------+                  |   |               |  |          +-----------------+
                             +---> pipe-by-name--+  |                             
+---------+                  |   |               |  |          +-----------------+
|         |                  |   |               |  |          |                 |
|  Alice  +----ssh -l alice--+   |               +------------->  Alice' machine |
|         |                      |                  |          |                 |
+---------+                      +------------------+          +-----------------+

 Downstream                         SSH Piper                       Upstream</pre> 
安裝方法：

go get github.com/tg123/sshpiper/sshpiperd
go install github.com/tg123/sshpiper/sshpiperd
 
運行：

$GOPATH/src/github.com/tg123/sshpiper/sshpiperd/example/showme.sh
 
將啟動 sshpiper 服務器：

ssh 127.0.0.1 -p 2222 -l github # connect to github.com:22
ssh 127.0.0.1 -p 2222 -l linode # connect to lish-atlanta.linode.com:22
 
連接方法：

$ ssh 0 -p 2222 -l linode.com:22
linode@0's password:

$ ssh 0 -p 2222 -l github
Permission denied (publickey).</pre> 
配置：

$ sshpiperd -h
  -h=false: Print help and exit
  -i="/etc/ssh/ssh_host_rsa_key": Key file for SSH Piper
  -l="0.0.0.0": Listening Address
  -p=2222: Listening Port
  -w="/var/sshpiper": Working Dir
 
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