initial commit

Dockerfile

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+FROM xena/go:1.13.3 AS build
+ENV PORT 2222
+ENV TARGET 127.0.0.1:22
+ENV GOPROXY https://cache.greedo.xeserv.us
+ENV CGO_ENABLED 0
+WORKDIR /within/proxystrip
+COPY . .
+RUN GOBIN=/usr/local/bin go install
+
+FROM gitea/gitea:1.10.0
+COPY --from=build /usr/local/bin/proxystrip /usr/local/bin/proxystrip
+COPY run.sh /etc/s6/proxystrip/run

LICENSE

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+Copyright (c) 2019 Christine Dodrill <me@christine.website>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.

README.md

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+# proxystrip
+
+A hack to make my gitea instance work over SSH+PROXY protocol.

go.mod

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+module tulpa.dev/within/proxystrip
+
+go 1.13
+
+require (
+	github.com/armon/go-proxyproto v0.0.0-20190211145416-68259f75880e
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/facebookgo/ensure v0.0.0-20160127193407-b4ab57deab51 // indirect
+	github.com/facebookgo/flagenv v0.0.0-20160425205200-fcd59fca7456
+	github.com/facebookgo/stack v0.0.0-20160209184415-751773369052 // indirect
+	github.com/facebookgo/subset v0.0.0-20150612182917-8dac2c3c4870 // indirect
+)

go.sum

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+github.com/armon/go-proxyproto v0.0.0-20190211145416-68259f75880e h1:h0gP0hBU6DsA5IQduhLWGOEfIUKzJS5hhXQBSgHuF/g=
+github.com/armon/go-proxyproto v0.0.0-20190211145416-68259f75880e/go.mod h1:QmP9hvJ91BbJmGVGSbutW19IC0Q9phDCLGaomwTJbgU=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/facebookgo/ensure v0.0.0-20160127193407-b4ab57deab51 h1:0JZ+dUmQeA8IIVUMzysrX4/AKuQwWhV2dYQuPZdvdSQ=
+github.com/facebookgo/ensure v0.0.0-20160127193407-b4ab57deab51/go.mod h1:Yg+htXGokKKdzcwhuNDwVvN+uBxDGXJ7G/VN1d8fa64=
+github.com/facebookgo/flagenv v0.0.0-20160425205200-fcd59fca7456 h1:CkmB2l68uhvRlwOTPrwnuitSxi/S3Cg4L5QYOcL9MBc=
+github.com/facebookgo/flagenv v0.0.0-20160425205200-fcd59fca7456/go.mod h1:zFhibDvPDWmtk4dAQ05sRobtyoffEHygEt3wSNuAzz8=
+github.com/facebookgo/stack v0.0.0-20160209184415-751773369052 h1:JWuenKqqX8nojtoVVWjGfOF9635RETekkoH6Cc9SX0A=
+github.com/facebookgo/stack v0.0.0-20160209184415-751773369052/go.mod h1:UbMTZqLaRiH3MsBH8va0n7s1pQYcu3uTb8G4tygF4Zg=
+github.com/facebookgo/subset v0.0.0-20150612182917-8dac2c3c4870 h1:E2s37DuLxFhQDg5gKsWoLBOB0n+ZW8s599zru8FJ2/Y=
+github.com/facebookgo/subset v0.0.0-20150612182917-8dac2c3c4870/go.mod h1:5tD+neXqOorC30/tWg0LCSkrqj/AR6gu8yY8/fpw1q0=

main.go

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+package main
+
+import (
+	"flag"
+	"io"
+	"log"
+	"net"
+
+	"github.com/armon/go-proxyproto"
+	"github.com/facebookgo/flagenv"
+)
+
+var (
+	target = flag.String("target-host", "127.0.0.1:22", "target TCP host:port")
+	port   = flag.String("port", "2222", "TCP port to listen on")
+)
+
+func main() {
+	flagenv.Parse()
+	flag.Parse()
+
+	list, err := net.Listen("tcp", ":"+*port)
+	if err != nil {
+		panic(err)
+	}
+
+	log.Printf("now listening on port %s, forwarding traffic to %s", *port, *target)
+
+	proxyList := &proxyproto.Listener{Listener: list}
+
+	for {
+		conn, err := proxyList.Accept()
+		if err != nil {
+			log.Println(err)
+			continue
+		}
+		go dataTo(conn)
+	}
+}
+
+func dataTo(conn net.Conn) {
+	defer conn.Close()
+	peer, err := net.Dial("tcp", *target)
+	if err != nil {
+		log.Println(*target, err)
+	}
+	defer peer.Close()
+
+	go io.Copy(conn, peer)
+	io.Copy(peer, conn)
+}

run.sh

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+#!/bin/sh
+
+proxystrip