Initial Fork

.github/workflows/checks.yml

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+name: checks
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['*']
+
+jobs:
+  checks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: WillAbides/setup-go-faster@v1.7.0
+        with:
+          go-version: 1.17
+      - run: go install mvdan.cc/gofumpt@latest
+      - run: test -z $(gofumpt -l .)
+      - run: go vet ./...
+      - run: go build ./...

.github/workflows/release.yml

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+name: release
+
+on:
+  push:
+    tags: ['v*']
+
+permissions:
+  contents: write
+  packages: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: WillAbides/setup-go-faster@v1.7.0
+        with:
+          go-version: 1.17
+      - uses: goreleaser/goreleaser-action@v2
+        with:
+          distribution: goreleaser
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

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+tsstate/
+dist/

.goreleaser.yml

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+before:
+  hooks:
+    - go mod tidy -compat=1.17
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+    goarch:
+      - amd64
+      - arm64
+    ignore:
+      - goos: windows
+        goarch: arm64
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ .Tag }}-next"

LICENSE

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+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# tailscale-netcat
+
+This tool is designed to immitate netcat for the purposes of SSH's ProxyCommand. It may work for other uses of netcat within a Tailscale network but I wouldn't trust it.
+
+## Usage
+
+On first run you will need to login, a link is provided for ease of use. Auth keys are also supported, see below for use
+```
+sean@laptop:~$ ssh -o 'ProxyCommand tailscale-netcat -host %h -port %p' myserver
+2022/04/02 15:54:42 NeedsLogin: https://login.tailscale.com/a/12345678
+kex_exchange_identification: Connection closed by remote host
+```
+
+On second login, you'll be in:
+```
+sean@laptop:~$ ssh -o 'ProxyCommand tailscale-netcat -host %h -port %p' myserver
+sean@myserver:~$
+```
+
+Optional Env Vars:
+
+`TS_AUTHKEY` is now enabled for this project. You can provide this variable with a key, consult the tailscale documentation to determine the appropriate key to use.
+
+`TS_STATEDIR` is the location where the persistent data for the sidecar will be stored. This is used to not need to re-authorise the instance. In a container setup, you'll want to have this persisted. The default is `./tsstate`, which will result in Tailscale using `home/nonroot/tsstate` in the Docker container.
+
+
+## Credits
+* https://github.com/markpash/tailscale-sidecar
+* https://github.com/vfedoroff/go-netcat

go.mod

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+module github.com/seanhood/tailscale-netcat
+
+go 1.17
+
+require tailscale.com v1.22.2
+
+require (
+	github.com/akutz/memconn v0.1.0 // indirect
+	github.com/alexbrainman/sspi v0.0.0-20210105120005-909beea2cc74 // indirect
+	github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be // indirect
+	github.com/coreos/go-iptables v0.6.0 // indirect
+	github.com/creack/pty v1.1.17 // indirect
+	github.com/gliderlabs/ssh v0.3.3 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/godbus/dbus/v5 v5.0.6 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/google/btree v1.0.1 // indirect
+	github.com/google/go-cmp v0.5.7 // indirect
+	github.com/insomniacslk/dhcp v0.0.0-20211026125128-ad197bcd36fd // indirect
+	github.com/josharian/native v1.0.0 // indirect
+	github.com/jsimonetti/rtnetlink v0.0.0-20211203074127-fd9a11f42291 // indirect
+	github.com/klauspost/compress v1.13.6 // indirect
+	github.com/mdlayher/netlink v1.6.0 // indirect
+	github.com/mdlayher/sdnotify v0.0.0-20210228150836-ea3ec207d697 // indirect
+	github.com/mdlayher/socket v0.1.1 // indirect
+	github.com/mitchellh/go-ps v1.0.0 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/tailscale/certstore v0.0.0-20210528134328-066c94b793d3 // indirect
+	github.com/tailscale/goupnp v1.0.1-0.20210804011211-c64d0f06ea05 // indirect
+	github.com/tailscale/netlink v1.1.1-0.20211101221916-cabfb018fe85 // indirect
+	github.com/tcnksm/go-httpstat v0.2.0 // indirect
+	github.com/u-root/uio v0.0.0-20210528114334-82958018845c // indirect
+	github.com/vishvananda/netlink v1.1.1-0.20211101163509-b10eb8fe5cf6 // indirect
+	github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74 // indirect
+	go4.org/intern v0.0.0-20211027215823-ae77deb06f29 // indirect
+	go4.org/mem v0.0.0-20210711025021-927187094b94 // indirect
+	go4.org/unsafe/assume-no-moving-gc v0.0.0-20211027215541-db492cf91b37 // indirect
+	golang.org/x/crypto v0.0.0-20211202192323-5770296d904e // indirect
+	golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/sys v0.0.0-20220128215802-99c3d69c2c27 // indirect
+	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/time v0.0.0-20211116232009-f0f3c7e86c11 // indirect
+	golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 // indirect
+	golang.zx2c4.com/wireguard v0.0.0-20211116201604-de7c702ace45 // indirect
+	golang.zx2c4.com/wireguard/windows v0.4.10 // indirect
+	gvisor.dev/gvisor v0.0.0-20220126021142-d8aa030b2591 // indirect
+	inet.af/netaddr v0.0.0-20211027220019-c74959edd3b6 // indirect
+	nhooyr.io/websocket v1.8.7 // indirect
+)