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54 lines
2 KiB
Go
54 lines
2 KiB
Go
package proxy
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import (
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"bytes"
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"fmt"
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)
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// bash header plus an embedded perl script that can be used
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// as an alternative to socat to proxy tcp traffic.
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const header = `#!/bin/bash
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set +e
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`
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// TODO(bradrydzewski) probably going to remove this
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//echo 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 | base64 -d | gunzip > /tmp/socat && chmod +x /tmp/socat
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// this command string will check if the socat utility
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// exists, and if it does, will proxy connections to
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// the external IP address.
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const command = "command -v socat >/dev/null && socat TCP-LISTEN:%s,fork TCP:%s:%s &\n"
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// alternative command that acts as a "polyfill" for socat
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// in the event that it isn't installed on the server
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const polyfill = "[ -x /tmp/socat ] && /tmp/socat TCP-LISTEN:%s,fork TCP:%s:%s &\n"
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// Proxy stores proxy configuration details mapping
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// a local port to an external IP address with the
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// same port number.
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type Proxy map[string]string
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func (p Proxy) Set(port, ip string) {
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p[port] = ip
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}
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// String converts the proxy configuration details
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// to a bash script.
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func (p Proxy) String() string {
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var buf bytes.Buffer
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buf.WriteString(header)
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for port, ip := range p {
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buf.WriteString(fmt.Sprintf(command, port, ip, port))
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// TODO(bradrydzewski) probably going to remove this
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//buf.WriteString(fmt.Sprintf(polyfill, port, ip, port))
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}
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return buf.String()
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}
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// Bytes converts the proxy configuration details
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// to a bash script in byte array format.
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func (p Proxy) Bytes() []byte {
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return []byte(p.String())
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}
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