First import

.github/test.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+((count = 100))                        
+while [[ $count -ne 0 ]] ; do
+    ping -c 1 $1                   
+    rc=$?
+    if [[ $rc -eq 0 ]] ; then
+        ((count = 1))
+    fi
+    ((count = count - 1))
+done
+
+if [[ $rc -eq 0 ]] ; then
+    echo "Alright"
+    sleep 20
+    exit 0
+else
+    echo "Test failed"
+    exit 1
+fi

.github/workflows/build.yml

@@ -0,0 +1,22 @@
+name: Build
+
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: build --rm-dist --snapshot

.github/workflows/release.yml

@@ -0,0 +1,26 @@
+name: goreleaser
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 

.github/workflows/test.yml

@@ -0,0 +1,70 @@
+name: Test
+
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
+      
+      - name: Build
+        run:
+            go build
+      
+      - name: Generate edgevpnconfig
+        run: |
+              ./edgevpn -g > config.yaml
+
+
+      - name: Upload results
+        uses: actions/upload-artifact@v2
+        with:
+          name: connection
+          path: config.yaml
+          if-no-files-found: error
+      - name: Upload results
+        uses: actions/upload-artifact@v2
+        with:
+          name: edgevpn
+          path: edgevpn
+          if-no-files-found: error
+  
+  test:
+    runs-on: ubuntu-latest
+    needs: build
+    strategy:
+      matrix:
+        include:
+          - ip: "10.1.0.13/24"
+            target_ip: "10.1.0.11"
+          - ip: "10.1.0.11/24"
+            target_ip: "10.1.0.13"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Download result for build
+        uses: actions/download-artifact@v2
+        with:
+          name: connection
+          path: ./
+      - name: Download result for build
+        uses: actions/download-artifact@v2
+        with:
+          name: edgevpn
+          path: ./
+      - name: Ping test
+        run: |
+              chmod +x edgevpn
+              sudo EDGEVPNCONFIG=config.yaml IFACE=edgevpn0 ADDRESS=${{ matrix.ip }} ./edgevpn &
+              bash ./.github/test.sh ${{ matrix.target_ip }}

.gitignore

@@ -0,0 +1,4 @@
+/edgevpn
+/edgevpn*.yaml
+/dist
+/vendor

.goreleaser.yml

@@ -0,0 +1,40 @@
+# Make sure to check the documentation at http://goreleaser.com
+builds:
+  - ldflags:
+      - -w -s
+      - -X github.com/mudler/edgevpn/internal.Version={{.Tag}}
+      - -X github.com/mudler/edgevpn/internal.Commit={{.Commit}}
+    env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+    goarch:
+      - amd64
+      - arm
+      - 386
+      - arm64
+source:
+  enabled: true
+  name_template: '{{ .ProjectName }}-{{ .Tag }}-source'
+archives:
+  # Default template uses underscores instead of -
+  - name_template: "{{ .ProjectName }}-{{ .Tag }}-{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}"
+    replacements:
+      darwin: Darwin
+      linux: Linux
+      windows: Windows
+      386: i386
+      amd64: x86_64
+checksum:
+  name_template: '{{ .ProjectName }}-{{ .Tag }}-checksums.txt'
+snapshot:
+  name_template: "{{ .Tag }}-next"
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'
+      - '^Merge pull request'

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
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+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
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+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
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+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
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+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    {one line to give the program's name and a brief idea of what it does.}
+    Copyright (C) {year}  {name of author}
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    {project}  Copyright (C) {year}  {fullname}
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

README.md

@@ -0,0 +1,91 @@
+# :sailboat: EdgeVPN
+
+Fully Decentralized. Immutable. Portable. Easy to use Statically compiled VPN
+
+## Usage
+
+Generate a config:
+
+```bash
+./edgevpn -g > config.yaml
+```
+
+Run it on multiple hosts:
+
+```bash
+EDGEVPNCONFIG=config.yaml IFACE=edgevpn0 ADDRESS=10.1.0.11/24 ./edgevpn
+EDGEVPNCONFIG=config.yaml IFACE=edgevpn0 ADDRESS=10.1.0.12/24 ./edgevpn
+EDGEVPNCONFIG=config.yaml IFACE=edgevpn0 ADDRESS=10.1.0.13/24 ./edgevpn
+...
+```
+
+... and that's it!
+
+*Note*: It might take up time to build the connection between nodes. Wait at least 5 mins, it depends on the network behind the hosts.
+
+## Is it for me?
+
+EdgeVPN makes VPN decentralization a first strong requirement. 
+
+Its mainly use is for edge and low-end devices and especially for development.
+
+The decentralized approach has few cons:
+
+- The underlaying network is chatty. It uses a Gossip protocol and p2p. Every message is broadcasted to all peers.
+- Not suited for low latency. On my local tests on very slow connections, ping took ~200ms.
+
+Keep that in mind before using it for your prod networks!
+
+But it has a strong pro: it just works everywhere libp2p works!
+
+## As a library
+
+EdgeVPN can be used as a library. It is very portable and offers a functional interface:
+
+```golang
+
+import (
+    edgevpn "github.com/mudler/edgevpn/pkg/edgevpn"
+)
+
+e := edgevpn.New(edgevpn.Logger(l),
+    edgevpn.LogLevel(log.LevelInfo),
+    edgevpn.MaxMessageSize(2 << 20),
+    edgevpn.WithMTU(1500),
+    edgevpn.WithInterfaceMTU(1300),
+    edgevpn.WithInterfaceAddress(os.Getenv("ADDRESS")),
+    edgevpn.WithInterfaceName(os.Getenv("IFACE")),
+    // ....
+    edgevpn.WithInterfaceType(water.TAP))
+
+e.Start()
+
+```
+
+## Architecture
+
+- p2p encryption between peers with libp2p
+- randezvous points dynamically generated from OTP keys
+- extra AES symmetric encryption on top. In case randezvous point is compromised
+
+
+## Credits
+
+- The awesome [libp2p](https://github.com/libp2p) library
+- [https://github.com/songgao/water](https://github.com/songgao/water) for tun/tap devices in golang
+- [Room example](https://github.com/libp2p/go-libp2p/tree/master/examples/chat-with-rendezvous) (shamelessly parts are copied by)
+
+## Disclaimers
+
+I'm not a security expert, and this software didn't went through a full security audit, so don't use and rely it for sensible traffic! I did this mostly for fun while I was experimenting with libp2p. 
+
+## LICENSE
+
+GNU GPLv3.
+
+```
+edgevpn  Copyright (C) 2021 Ettore Di Giacinto
+This program comes with ABSOLUTELY NO WARRANTY.
+This is free software, and you are welcome to redistribute it
+under certain conditions.
+```

go.mod

@@ -0,0 +1,40 @@
+module github.com/mudler/edgevpn
+
+go 1.14
+
+require (
+	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
+	github.com/golang/protobuf v1.4.3 // indirect
+	github.com/google/go-cmp v0.5.5 // indirect
+	github.com/ipfs/go-log/v2 v2.1.1
+	github.com/kr/text v0.2.0 // indirect
+	github.com/libp2p/go-libp2p v0.13.0
+	github.com/libp2p/go-libp2p-core v0.8.0
+	github.com/libp2p/go-libp2p-discovery v0.5.0
+	github.com/libp2p/go-libp2p-kad-dht v0.11.1
+	github.com/libp2p/go-libp2p-pubsub v0.4.1
+	github.com/lthibault/jitterbug v2.0.0+incompatible
+	github.com/multiformats/go-multiaddr v0.3.1
+	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
+	github.com/pkg/errors v0.9.1
+	github.com/songgao/packets v0.0.0-20160404182456-549a10cd4091
+	github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8
+	github.com/vishvananda/netlink v1.1.0
+	github.com/xlzd/gotp v0.0.0-20181030022105-c8557ba2c119
+	go.uber.org/zap v1.16.0
+	golang.org/x/crypto v0.0.0-20210317152858-513c2a44f670 // indirect
+	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
+	golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4 // indirect
+	golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4 // indirect
+	golang.org/x/text v0.3.5 // indirect
+	golang.org/x/tools v0.1.1-0.20210319172145-bda8f5cee399 // indirect
+	google.golang.org/protobuf v1.25.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
+	gopkg.in/yaml.v2 v2.4.0
+	gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c // indirect
+	honnef.co/go/tools v0.1.1 // indirect
+)
+
+//replace berty.tech/go-libp2p-tor-transport => github.com/Jorropo/go-libp2p-tor-transport v0.5.2-0.20210219105543-8147363e3140

go.sum

@@ -0,0 +1,776 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/AndreasBriese/bbloom v0.0.0-20180913140656-343706a395b7/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
+github.com/AndreasBriese/bbloom v0.0.0-20190306092124-e2d15f34fcf9/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/Kubuxu/go-os-helper v0.0.1/go.mod h1:N8B+I7vPCT80IcP58r50u4+gEEcsZETFUpAzWW2ep1Y=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6 h1:G1bPvciwNyF7IUmKXNt9Ak3m6u9DE1rF+RmtIkBpVdA=
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+github.com/benbjohnson/clock v1.0.2/go.mod h1:bGMdMPoPVvcYyt1gHDf4J2KE153Yf9BuiUKYMaxlTDM=
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+github.com/btcsuite/go-socks v0.0.0-20170105172521-4720035b7bfd/go.mod h1:HHNXQzUsZCxOoE+CPiyCTO6x34Zs86zZUiwtpXoGdtg=
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internal/version.go

@@ -0,0 +1,4 @@
+package internal
+
+var Version = ""
+var Commit = ""

main.go

@@ -0,0 +1,100 @@
+// Copyright © 2021 Ettore Di Giacinto <[email protected]>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/ipfs/go-log/v2"
+	"github.com/songgao/water"
+
+	internal "github.com/mudler/edgevpn/internal"
+	"go.uber.org/zap"
+	"gopkg.in/yaml.v2"
+
+	edgevpn "github.com/mudler/edgevpn/pkg/edgevpn"
+)
+
+func main() {
+	help := flag.Bool("h", false, "Display Help")
+	genKeys := flag.Bool("g", false, "Generate pub/priv keys")
+
+	l, _ := zap.NewProduction()
+	defer l.Sync() // flushes buffer, if any
+
+	opts := []edgevpn.Option{
+		edgevpn.Logger(l),
+		edgevpn.LogLevel(log.LevelInfo),
+		edgevpn.MaxMessageSize(2 << 20), // 2MB
+		edgevpn.WithMTU(1500),
+		edgevpn.WithInterfaceMTU(1300),
+		edgevpn.WithInterfaceAddress(os.Getenv("ADDRESS")),
+		edgevpn.WithInterfaceName(os.Getenv("IFACE")),
+		edgevpn.WithInterfaceType(water.TAP),
+	}
+
+	opts = append(opts, edgevpn.FromYaml(os.Getenv("EDGEVPNCONFIG")))
+	flag.Parse()
+
+	e := edgevpn.New(opts...)
+
+	if *help {
+		fmt.Println("edgevpn uses libp2p to build an immutable trusted p2p network")
+		fmt.Println("")
+		fmt.Println()
+		fmt.Println("Usage: Run './edgevpn in two different terminals. Let them connect to the bootstrap nodes, announce themselves and connect to the peers")
+		flag.PrintDefaults()
+		return
+	}
+
+	if *genKeys {
+		newData, err := edgevpn.GenerateNewConnectionData()
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+
+		bytesData, err := yaml.Marshal(newData)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+
+		fmt.Println(string(bytesData))
+		os.Exit(0)
+	}
+
+	l.Sugar().Info(`
+	edgevpn  Copyright (C) 2021 Ettore Di Giacinto
+	This program comes with ABSOLUTELY NO WARRANTY.
+	This is free software, and you are welcome to redistribute it
+	under certain conditions.
+	`)
+
+	l.Sugar().Infof("Version: %s commit: %s", internal.Version, internal.Commit)
+	if os.Getenv("EDGEVPNCONFIG") == "" {
+		l.Sugar().Fatal("EDGEVPNCONFIG not supplied. config file is required")
+	}
+	l.Sugar().Info("Start")
+
+	if err := e.Start(); err != nil {
+		l.Sugar().Info("Failed")
+		os.Exit(1)
+	}
+
+}

pkg/discovery/address.go

@@ -0,0 +1,27 @@
+package discovery
+
+import (
+	"strings"
+
+	maddr "github.com/multiformats/go-multiaddr"
+)
+
+// A new type we need for writing a custom flag parser
+type AddrList []maddr.Multiaddr
+
+func (al *AddrList) String() string {
+	strs := make([]string, len(*al))
+	for i, addr := range *al {
+		strs[i] = addr.String()
+	}
+	return strings.Join(strs, ",")
+}
+
+func (al *AddrList) Set(value string) error {
+	addr, err := maddr.NewMultiaddr(value)
+	if err != nil {
+		return err
+	}
+	*al = append(*al, addr)
+	return nil
+}

pkg/discovery/dht.go

@@ -0,0 +1,170 @@
+package discovery
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"go.uber.org/zap"
+
+	"github.com/libp2p/go-libp2p"
+	"github.com/libp2p/go-libp2p-core/host"
+	"github.com/libp2p/go-libp2p-core/peer"
+	"github.com/libp2p/go-libp2p-core/routing"
+	discovery "github.com/libp2p/go-libp2p-discovery"
+	dht "github.com/libp2p/go-libp2p-kad-dht"
+	"github.com/lthibault/jitterbug"
+	"github.com/xlzd/gotp"
+)
+
+type DHT struct {
+	OTPKey               string
+	OTPInterval          int
+	KeyLength            int
+	RendezvousString     string
+	BootstrapPeers       AddrList
+	latestRendezvous     string
+	console              *zap.Logger
+	RefreshDiscoveryTime int64
+	dht                  *dht.IpfsDHT
+}
+
+func (d *DHT) Option(ctx context.Context) func(c *libp2p.Config) error {
+	return libp2p.Routing(func(h host.Host) (routing.PeerRouting, error) {
+		// make the DHT with the given Host
+		return d.startDHT(ctx, h)
+	})
+}
+func (d *DHT) Rendezvous() string {
+	if d.OTPKey != "" {
+		totp := gotp.NewTOTP(d.OTPKey, 6, d.OTPInterval, nil)
+
+		//totp := gotp.NewDefaultTOTP(d.OTPKey)
+		rv := totp.Now()
+		d.latestRendezvous = rv
+		return rv
+	}
+	return d.RendezvousString
+}
+
+func (d *DHT) startDHT(ctx context.Context, h host.Host) (*dht.IpfsDHT, error) {
+	if d.dht == nil {
+		// Start a DHT, for use in peer discovery. We can't just make a new DHT
+		// client because we want each peer to maintain its own local copy of the
+		// DHT, so that the bootstrapping node of the DHT can go down without
+		// inhibiting future peer discovery.
+		kad, err := dht.New(ctx, h)
+		if err != nil {
+			return d.dht, err
+		}
+		d.dht = kad
+	}
+
+	return d.dht, nil
+}
+
+func (d *DHT) Run(c *zap.Logger, ctx context.Context, host host.Host) error {
+	d.console = c
+	if len(d.BootstrapPeers) == 0 {
+		d.BootstrapPeers = dht.DefaultBootstrapPeers
+	}
+	// Start a DHT, for use in peer discovery. We can't just make a new DHT
+	// client because we want each peer to maintain its own local copy of the
+	// DHT, so that the bootstrapping node of the DHT can go down without
+	// inhibiting future peer discovery.
+	kademliaDHT, err := d.startDHT(ctx, host)
+	if err != nil {
+		return err
+	}
+
+	// Bootstrap the DHT. In the default configuration, this spawns a Background
+	// thread that will refresh the peer table every five minutes.
+	c.Sugar().Info("Bootstrapping the DHT")
+	if err = kademliaDHT.Bootstrap(ctx); err != nil {
+		return err
+	}
+
+	d.bootstrapPeers(c, ctx, host)
+	d.announceAndConnect(ctx, kademliaDHT, host, d.Rendezvous())
+
+	go func() {
+
+		t := jitterbug.New(
+			time.Second*time.Duration(d.RefreshDiscoveryTime),
+			&jitterbug.Norm{Stdev: time.Second * 10},
+		)
+		defer t.Stop()
+		for {
+			select {
+			case <-t.C:
+				d.bootstrapPeers(c, ctx, host)
+				if d.latestRendezvous != "" {
+					d.announceAndConnect(ctx, kademliaDHT, host, d.latestRendezvous)
+				}
+
+				rv := d.Rendezvous()
+				d.announceAndConnect(ctx, kademliaDHT, host, rv)
+
+			case <-ctx.Done():
+				return
+			}
+		}
+	}()
+
+	return nil
+}
+
+func (d *DHT) bootstrapPeers(c *zap.Logger, ctx context.Context, host host.Host) {
+	// Let's connect to the bootstrap nodes first. They will tell us about the
+	// other nodes in the network.
+	var wg sync.WaitGroup
+	for _, peerAddr := range d.BootstrapPeers {
+		peerinfo, _ := peer.AddrInfoFromP2pAddr(peerAddr)
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			if err := host.Connect(ctx, *peerinfo); err != nil {
+				c.Sugar().Warn(err.Error())
+			} else {
+				c.Sugar().Info("Connection established with bootstrap node:", *peerinfo)
+			}
+		}()
+	}
+	wg.Wait()
+}
+
+func (d *DHT) announceAndConnect(ctx context.Context, kademliaDHT *dht.IpfsDHT, host host.Host, rv string) error {
+	d.console.Sugar().Info("Announcing ourselves...")
+	routingDiscovery := discovery.NewRoutingDiscovery(kademliaDHT)
+	discovery.Advertise(ctx, routingDiscovery, rv)
+	d.console.Sugar().Info("Successfully announced!")
+	// Now, look for others who have announced
+	// This is like your friend telling you the location to meet you.
+	d.console.Sugar().Info("Searching for other peers...")
+	peerChan, err := routingDiscovery.FindPeers(ctx, rv)
+	if err != nil {
+		return err
+	}
+	var wg sync.WaitGroup
+
+	for p := range peerChan {
+		// Don't dial ourselves or peers without address
+		if p.ID == host.ID() || len(p.Addrs) == 0 {
+			continue
+		}
+		wg.Add(1)
+		go func(a peer.AddrInfo) {
+			defer wg.Done()
+			d.console.Sugar().Info("Found peer:", a)
+			if err := host.Connect(ctx, a); err != nil {
+				d.console.Sugar().Info("Failed connecting to", a)
+			} else {
+				d.console.Sugar().Info("Connected to:", a)
+			}
+		}(p)
+
+	}
+	wg.Wait()
+
+	return nil
+}

pkg/discovery/mdns.go

@@ -0,0 +1,55 @@
+package discovery
+
+import (
+	"context"
+	"time"
+
+	"github.com/libp2p/go-libp2p"
+	"go.uber.org/zap"
+
+	"github.com/libp2p/go-libp2p-core/peer"
+	"github.com/libp2p/go-libp2p/p2p/discovery"
+
+	"github.com/libp2p/go-libp2p-core/host"
+)
+
+type MDNS struct {
+	DiscoveryServiceTag string
+}
+
+// DiscoveryInterval is how often we re-publish our mDNS records.
+const DiscoveryInterval = time.Second
+
+// discoveryNotifee gets notified when we find a new peer via mDNS discovery
+type discoveryNotifee struct {
+	h host.Host
+	c *zap.Logger
+}
+
+// HandlePeerFound connects to peers discovered via mDNS. Once they're connected,
+// the PubSub system will automatically start interacting with them if they also
+// support PubSub.
+func (n *discoveryNotifee) HandlePeerFound(pi peer.AddrInfo) {
+	//n.c.Infof("mDNS: discovered new peer %s\n", pi.ID.Pretty())
+	err := n.h.Connect(context.Background(), pi)
+	if err != nil {
+		n.c.Sugar().Warnf("mDNS: error connecting to peer %s: %s\n", pi.ID.Pretty(), err)
+	}
+}
+
+func (d *MDNS) Option(ctx context.Context) func(c *libp2p.Config) error {
+	return func(*libp2p.Config) error { return nil }
+}
+
+func (d *MDNS) Run(l *zap.Logger, ctx context.Context, host host.Host) error {
+
+	// setup mDNS discovery to find local peers
+	disc, err := discovery.NewMdnsService(ctx, host, DiscoveryInterval, d.DiscoveryServiceTag)
+	if err != nil {
+		return err
+	}
+
+	n := discoveryNotifee{h: host, c: l}
+	disc.RegisterNotifee(&n)
+	return nil
+}

pkg/edgevpn/config.go

@@ -0,0 +1,68 @@
+package edgevpn
+
+import (
+	"context"
+
+	"github.com/libp2p/go-libp2p"
+	"github.com/libp2p/go-libp2p-core/host"
+	discovery "github.com/mudler/edgevpn/pkg/discovery"
+	hub "github.com/mudler/edgevpn/pkg/hub"
+	"github.com/songgao/water"
+	"go.uber.org/zap"
+)
+
+type Config struct {
+	// ExchangeKey is a Symmetric key used to seal the messages
+	ExchangeKey string
+
+	// RoomName is the gossip room where all peers are subscribed to
+	RoomName string
+
+	// ListenAddresses is the discovery peer initial bootstrap addresses
+	ListenAddresses discovery.AddrList
+
+	// Insecure disables secure p2p e2e encrypted communication
+	Insecure bool
+
+	// Handlers are a list of handlers subscribed to messages received by the vpn interface
+	Handlers []Handler
+
+	MaxMessageSize   int
+	MTU              int
+	SealKeyInterval  int
+	Interface        *water.Interface
+	InterfaceName    string
+	InterfaceAddress string
+	InterfaceMTU     int
+	DeviceType       water.DeviceType
+	ServiceDiscovery []ServiceDiscovery
+	Logger           *zap.Logger
+
+	SealKeyLength int
+
+	// Handle is a handle consumed by HumanInterfaces to handle received messages
+	Handle func(bool, *hub.Message)
+}
+
+type Handler func(*hub.Message) error
+
+type ServiceDiscovery interface {
+	Run(*zap.Logger, context.Context, host.Host) error
+	Option(context.Context) func(c *libp2p.Config) error
+}
+
+type Option func(cfg *Config) error
+
+// Apply applies the given options to the config, returning the first error
+// encountered (if any).
+func (cfg *Config) Apply(opts ...Option) error {
+	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
+		if err := opt(cfg); err != nil {
+			return err
+		}
+	}
+	return nil
+}

pkg/edgevpn/connection.go

@@ -0,0 +1,91 @@
+package edgevpn
+
+import (
+	"context"
+	"crypto/rand"
+	"io"
+	mrand "math/rand"
+
+	"github.com/libp2p/go-libp2p"
+	"github.com/libp2p/go-libp2p-core/crypto"
+	"github.com/libp2p/go-libp2p-core/host"
+
+	hub "github.com/mudler/edgevpn/pkg/hub"
+	multiaddr "github.com/multiformats/go-multiaddr"
+	"github.com/xlzd/gotp"
+)
+
+func (e *EdgeVPN) Host() host.Host {
+	return e.host
+}
+
+func (e *EdgeVPN) genHost(ctx context.Context) (host.Host, error) {
+
+	var r io.Reader
+	if e.seed == 0 {
+		r = rand.Reader
+	} else {
+		r = mrand.New(mrand.NewSource(e.seed))
+	}
+	// Creates a new RSA key pair for this host.
+	prvKey, _, err := crypto.GenerateKeyPairWithReader(crypto.RSA, 2048, r)
+	if err != nil {
+		return nil, err
+	}
+
+	opts := []libp2p.Option{
+		libp2p.ListenAddrs([]multiaddr.Multiaddr(e.config.ListenAddresses)...),
+		libp2p.Identity(prvKey),
+		libp2p.EnableAutoRelay(),
+		libp2p.EnableNATService(),
+	}
+
+	for _, d := range e.config.ServiceDiscovery {
+		opts = append(opts, d.Option(ctx))
+	}
+
+	if e.config.Insecure {
+		opts = append(opts, libp2p.NoSecurity)
+	}
+
+	return libp2p.New(ctx, opts...)
+}
+
+func (e *EdgeVPN) sealkey() string {
+	totp := gotp.NewTOTP(e.config.ExchangeKey, 6, e.config.SealKeyInterval, nil)
+	return totp.Now()
+}
+
+func (e *EdgeVPN) handleEvents(ctx context.Context) {
+	for {
+		select {
+		case m := <-e.inputCh:
+			if err := m.Seal(e.sealkey()); err != nil {
+				e.config.Logger.Sugar().Warn(err.Error())
+			}
+			e.handleOutgoingMessage(m)
+		case m := <-e.HubRoom.Messages:
+			if err := m.Unseal(e.sealkey()); err != nil {
+				e.config.Logger.Sugar().Warn(err.Error())
+			}
+			e.handleReceivedMessage(m)
+		case <-ctx.Done():
+			return
+		case <-e.doneCh:
+			return
+		}
+	}
+}
+
+func (e *EdgeVPN) handleReceivedMessage(m *hub.Message) {
+	for _, h := range e.config.Handlers {
+		h(m)
+	}
+}
+
+func (e *EdgeVPN) handleOutgoingMessage(m *hub.Message) {
+	err := e.HubRoom.PublishMessage(m)
+	if err != nil {
+		e.config.Logger.Sugar().Warnf("publish error: %s", err)
+	}
+}

pkg/edgevpn/edgevpn.go

@@ -0,0 +1,150 @@
+package edgevpn
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/libp2p/go-libp2p-core/host"
+	pubsub "github.com/libp2p/go-libp2p-pubsub"
+	hub "github.com/mudler/edgevpn/pkg/hub"
+	"github.com/songgao/packets/ethernet"
+	"github.com/songgao/water"
+	"go.uber.org/zap"
+)
+
+type EdgeVPN struct {
+	config  Config
+	HubRoom *hub.Room
+	doneCh  chan struct{}
+	inputCh chan *hub.Message
+	seed    int64
+	nick    string
+	host    host.Host
+}
+
+func New(p ...Option) *EdgeVPN {
+	c := Config{}
+	c.Apply(p...)
+
+	return &EdgeVPN{
+		config:  c,
+		doneCh:  make(chan struct{}, 1),
+		inputCh: make(chan *hub.Message, 3000),
+		seed:    0,
+	}
+}
+
+func (e *EdgeVPN) Start() error {
+	ifce, err := e.createInterface()
+	if err != nil {
+		return err
+	}
+	defer ifce.Close()
+
+	// Set the handler when we receive packages
+	e.config.Handlers = append(e.config.Handlers, IfaceWriter(ifce))
+
+	e.config.Logger.Sugar().Info("starting edgevpn background daemon")
+
+	// Startup libp2p network
+	err = e.network()
+	if err != nil {
+		return err
+	}
+
+	// Write packets from interface
+	return e.writePackets(ifce)
+}
+
+func (e *EdgeVPN) writePackets(ifce *water.Interface) error {
+
+	if err := e.prepareInterface(); err != nil {
+		return err
+	}
+
+	mw, err := e.MessageWriter()
+	if err != nil {
+		return err
+	}
+	var frame ethernet.Frame
+
+	for {
+		frame.Resize(e.config.MTU)
+		n, err := ifce.Read([]byte(frame))
+		if err != nil {
+			return err
+		}
+		frame = frame[:n]
+		mw.Write(frame)
+		e.config.Logger.Debug("packet",
+			zap.String("dst", frame.Destination().String()),
+			zap.String("Src", frame.Source().String()),
+			zap.String("Ethertype", fmt.Sprint(frame.Ethertype())),
+			zap.String("Payload", fmt.Sprint(frame.Payload())),
+			zap.String("dst", frame.Destination().String()),
+		)
+	}
+}
+
+func (e *EdgeVPN) MessageWriter(opts ...hub.MessageOption) (*MessageWriter, error) {
+	mess := &hub.Message{}
+	mess.Apply(opts...)
+
+	return &MessageWriter{
+		c:     e.config,
+		input: e.inputCh,
+		mess:  mess,
+	}, nil
+}
+
+func (e *EdgeVPN) network() error {
+
+	ctx := context.Background()
+	e.config.Logger.Sugar().Info("generating host data")
+
+	host, err := e.genHost(ctx)
+	if err != nil {
+		e.config.Logger.Sugar().Error(err.Error())
+
+		return err
+	}
+	e.host = host
+
+	e.config.Logger.Sugar().Info("Host created. We are:", host.ID())
+	e.config.Logger.Sugar().Info(host.Addrs())
+
+	// Set a function as stream handler. This function is called when a peer
+	// initiates a connection and starts a stream with this peer.
+	//host.SetStreamHandler(protocol.ID(e.config.ProtocolID), w.handleStream)
+
+	// create a new PubSub service using the GossipSub router
+	ps, err := pubsub.NewGossipSub(ctx, host, pubsub.WithMaxMessageSize(e.config.MaxMessageSize))
+	if err != nil {
+		return err
+	}
+
+	// join the chat room
+	cr, err := hub.JoinRoom(ctx, ps, host.ID(), e.config.RoomName)
+	if err != nil {
+		return err
+	}
+
+	e.HubRoom = cr
+
+	for _, sd := range e.config.ServiceDiscovery {
+		if err := sd.Run(e.config.Logger, ctx, host); err != nil {
+			e.config.Logger.Sugar().Fatal(err)
+		}
+	}
+
+	e.config.Logger.Sugar().Info("starting event handler")
+	go e.handleEvents(ctx)
+	e.config.Logger.Sugar().Info("started event handler successfully")
+
+	return nil
+}
+
+// end signals the event loop to exit gracefully
+func (e *EdgeVPN) Stop() {
+	e.doneCh <- struct{}{}
+}

pkg/edgevpn/interface.go

@@ -0,0 +1,44 @@
+// +build !windows
+
+package edgevpn
+
+import (
+	"github.com/songgao/water"
+	"github.com/vishvananda/netlink"
+)
+
+func (e *EdgeVPN) createInterface() (*water.Interface, error) {
+	config := water.Config{
+		DeviceType: e.config.DeviceType,
+	}
+	config.Name = e.config.InterfaceName
+
+	return water.New(config)
+}
+
+func (e *EdgeVPN) prepareInterface() error {
+	link, err := netlink.LinkByName(e.config.InterfaceName)
+	if err != nil {
+		return err
+	}
+	addr, err := netlink.ParseAddr(e.config.InterfaceAddress)
+	if err != nil {
+		return err
+	}
+
+	err = netlink.LinkSetMTU(link, e.config.InterfaceMTU)
+	if err != nil {
+		return err
+	}
+
+	err = netlink.AddrAdd(link, addr)
+	if err != nil {
+		return err
+	}
+
+	err = netlink.LinkSetUp(link)
+	if err != nil {
+		return err
+	}
+	return nil
+}

pkg/edgevpn/interface_windows.go

@@ -0,0 +1,18 @@
+// +build windows
+
+package edgevpn
+
+import "github.com/songgao/water"
+
+func (e *EdgeVPN) prepareInterface() error {
+
+	return nil
+}
+
+func (e *EdgeVPN) createInterface() (*water.Interface, error) {
+	config := water.Config{
+		DeviceType: e.config.DeviceType,
+	}
+
+	return water.New(config)
+}

pkg/edgevpn/message.go

@@ -0,0 +1,26 @@
+package edgevpn
+
+import (
+	"fmt"
+
+	hub "github.com/mudler/edgevpn/pkg/hub"
+)
+
+type MessageWriter struct {
+	input chan<- *hub.Message
+	c     Config
+	mess  *hub.Message
+}
+
+func Message(template string, opts ...interface{}) []byte {
+	return []byte(fmt.Sprintf(template, opts...))
+}
+
+func (mw *MessageWriter) Write(p []byte) (n int, err error) {
+	return mw.Send(mw.mess.WithMessage(string(p)))
+}
+
+func (mw *MessageWriter) Send(copy *hub.Message) (n int, err error) {
+	mw.input <- copy
+	return len(copy.Message), nil
+}

pkg/edgevpn/options.go

@@ -0,0 +1,225 @@
+package edgevpn
+
+import (
+	"io/ioutil"
+
+	"github.com/ipfs/go-log/v2"
+	discovery "github.com/mudler/edgevpn/pkg/discovery"
+	"github.com/mudler/edgevpn/pkg/hub"
+	"github.com/mudler/edgevpn/pkg/utils"
+	"github.com/pkg/errors"
+	"github.com/songgao/water"
+	"github.com/xlzd/gotp"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+	"gopkg.in/yaml.v2"
+)
+
+func IfaceWriter(i *water.Interface) Handler {
+	return Handler(func(m *hub.Message) error {
+		i.Write([]byte(m.Message))
+		return nil
+	})
+}
+
+func WithInterface(i *water.Interface) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.Interface = i
+		return nil
+	}
+}
+
+func WithInterfaceAddress(i string) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.InterfaceAddress = i
+		return nil
+	}
+}
+
+func WithInterfaceMTU(i int) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.InterfaceMTU = i
+		return nil
+	}
+}
+
+func WithInterfaceType(d water.DeviceType) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.DeviceType = d
+		return nil
+	}
+}
+
+func WithInterfaceName(i string) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.InterfaceName = i
+		return nil
+	}
+}
+
+func Logger(l *zap.Logger) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.Logger = l
+		return nil
+	}
+}
+
+// Handlers adds a handler to the list that is called on each received message
+func Handlers(h ...Handler) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		for _, cc := range h {
+			cfg.Handlers = append(cfg.Handlers, cc)
+		}
+		return nil
+	}
+}
+
+// DiscoveryService Adds the service given as argument to the discovery services
+func DiscoveryService(s ...ServiceDiscovery) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		for _, cc := range s {
+			cfg.ServiceDiscovery = append(cfg.ServiceDiscovery, cc)
+		}
+		return nil
+	}
+}
+
+func ListenAddresses(s string) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.ListenAddresses.Set(s)
+		return nil
+	}
+}
+
+func Insecure(b bool) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.Insecure = b
+		return nil
+	}
+}
+
+func ExchangeKeys(s string) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.ExchangeKey = s
+		return nil
+	}
+}
+
+func RoomName(s string) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.RoomName = s
+		return nil
+	}
+}
+
+func SealKeyInterval(i int) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.SealKeyInterval = i
+		return nil
+	}
+}
+
+func WithMTU(i int) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.MTU = i
+		return nil
+	}
+}
+
+func SealKeyLength(i int) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.SealKeyLength = i
+		return nil
+	}
+}
+
+func LogLevel(l log.LogLevel) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		log.SetAllLoggers(l)
+		log.SetLogLevel("edgevpn", zapcore.Level(l).String())
+		log.SetLogLevel("pubsub", "fatal")
+		log.SetLogLevel("dht/RtRefreshManager", "fatal")
+		log.SetLogLevel("swarm2", "fatal")
+		log.SetLogLevel("basichost", "fatal")
+		log.SetLogLevel("relay", "fatal")
+		log.SetLogLevel("dht", "fatal")
+		log.SetLogLevel("mdns", "fatal")
+		log.SetLogLevel("net/identify", "fatal")
+		return nil
+	}
+}
+
+func MaxMessageSize(i int) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		cfg.MaxMessageSize = i
+		return nil
+	}
+}
+
+type OTPConfig struct {
+	Interval int    `yaml:"interval"`
+	Key      string `yaml:"key"`
+	Length   int    `yaml:"length"`
+}
+
+type OTP struct {
+	DHT    OTPConfig `yaml:"dht"`
+	Crypto OTPConfig `yaml:"crypto"`
+}
+
+type YAMLConnectionConfig struct {
+	OTP OTP `yaml:"otp"`
+
+	RoomName   string `yaml:"room"`
+	Rendezvous string `yaml:"rendezvous"`
+	MDNS       string `yaml:"mdns"`
+}
+
+func (y YAMLConnectionConfig) Fill(cfg *Config) {
+	d := &discovery.DHT{
+		RefreshDiscoveryTime: 60,
+		OTPInterval:          y.OTP.DHT.Interval,
+		OTPKey:               y.OTP.DHT.Key,
+		KeyLength:            y.OTP.DHT.Length,
+		RendezvousString:     y.Rendezvous,
+	}
+	m := &discovery.MDNS{DiscoveryServiceTag: y.MDNS}
+	cfg.ExchangeKey = y.OTP.Crypto.Key
+	cfg.RoomName = y.RoomName
+	cfg.SealKeyInterval = y.OTP.Crypto.Interval
+	cfg.ServiceDiscovery = []ServiceDiscovery{d, m}
+	cfg.SealKeyLength = y.OTP.Crypto.Length
+}
+
+func GenerateNewConnectionData() (*YAMLConnectionConfig, error) {
+	config := YAMLConnectionConfig{}
+
+	config.RoomName = utils.RandStringRunes(23)
+	config.Rendezvous = utils.RandStringRunes(23)
+	config.MDNS = utils.RandStringRunes(23)
+
+	config.OTP.DHT.Key = gotp.RandomSecret(16)
+	config.OTP.Crypto.Key = gotp.RandomSecret(16)
+	config.OTP.DHT.Interval = 9000
+	config.OTP.Crypto.Interval = 9000
+	config.OTP.Crypto.Length = 12
+	config.OTP.DHT.Length = 12
+
+	return &config, nil
+}
+
+func FromYaml(path string) func(cfg *Config) error {
+	return func(cfg *Config) error {
+		t := YAMLConnectionConfig{}
+		data, err := ioutil.ReadFile(path)
+		if err != nil {
+			return errors.Wrap(err, "reading yaml file")
+		}
+
+		if err := yaml.Unmarshal(data, &t); err != nil {
+			return errors.Wrap(err, "parsing yaml")
+		}
+		t.Fill(cfg)
+		return nil
+	}
+}

pkg/hub/message.go

@@ -0,0 +1,67 @@
+package hub
+
+import (
+	"github.com/mudler/edgevpn/pkg/utils"
+	"github.com/pkg/errors"
+)
+
+// Message gets converted to/from JSON and sent in the body of pubsub messages.
+type Message struct {
+	Message  string
+	SenderID string
+
+	Annotations map[string]string
+}
+
+type MessageOption func(cfg *Message) error
+
+// Apply applies the given options to the config, returning the first error
+// encountered (if any).
+func (m *Message) Apply(opts ...MessageOption) error {
+	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
+		if err := opt(m); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func NewMessage(s string) *Message {
+	return &Message{Message: s}
+}
+
+func (m *Message) Seal(key string) error {
+	enckey := [32]byte{}
+	copy(enckey[:], key)
+	enc, err := utils.AESEncrypt(m.Message, &enckey)
+	if err != nil {
+		return errors.Wrap(err, "while sealing message")
+	}
+	m.Message = enc
+	return nil
+}
+
+func (m *Message) Unseal(key string) error {
+	enckey := [32]byte{}
+	copy(enckey[:], key)
+	dec, err := utils.AESDecrypt(m.Message, &enckey)
+	if err != nil {
+		return errors.Wrapf(err, "while unsealing message from peer: %s", m.SenderID)
+	}
+	m.Message = dec
+	return nil
+}
+
+func (m *Message) Copy() *Message {
+	copy := *m
+	return &copy
+}
+
+func (m *Message) WithMessage(s string) *Message {
+	copy := m.Copy()
+	copy.Message = s
+	return copy
+}

pkg/hub/room.go

@@ -0,0 +1,110 @@
+package hub
+
+import (
+	"context"
+	"encoding/json"
+
+	"github.com/libp2p/go-libp2p-core/peer"
+
+	pubsub "github.com/libp2p/go-libp2p-pubsub"
+)
+
+// RoomBufSize is the number of incoming messages to buffer for each topic.
+const RoomBufSize = 128
+
+// Room represents a subscription to a single PubSub topic. Messages
+// can be published to the topic with Room.Publish, and received
+// messages are pushed to the Messages channel.
+type Room struct {
+	// Messages is a channel of messages received from other peers in the chat room
+	Messages chan *Message
+
+	ctx   context.Context
+	ps    *pubsub.PubSub
+	topic *pubsub.Topic
+	sub   *pubsub.Subscription
+
+	roomName string
+	self     peer.ID
+	nick     string
+}
+
+// JoinRoom tries to subscribe to the PubSub topic for the room name, returning
+// a Room on success.
+func JoinRoom(ctx context.Context, ps *pubsub.PubSub, selfID peer.ID, roomName string) (*Room, error) {
+	// join the pubsub topic
+	topic, err := ps.Join(topicName(roomName))
+	if err != nil {
+		return nil, err
+	}
+
+	// and subscribe to it
+	sub, err := topic.Subscribe()
+	if err != nil {
+		return nil, err
+	}
+
+	cr := &Room{
+		ctx:      ctx,
+		ps:       ps,
+		topic:    topic,
+		sub:      sub,
+		self:     selfID,
+		roomName: roomName,
+		Messages: make(chan *Message, RoomBufSize),
+	}
+
+	// start reading messages from the subscription in a loop
+	go cr.readLoop()
+	return cr, nil
+}
+
+// Publish sends a message to the pubsub topic.
+func (cr *Room) Publish(message string, o ...func(*Message)) error {
+	m := &Message{
+		Message: message,
+	}
+
+	for _, f := range o {
+		f(m)
+	}
+
+	return cr.PublishMessage(m)
+}
+
+// Publish sends a message to the pubsub topic.
+func (cr *Room) PublishMessage(m *Message) error {
+	m.SenderID = cr.self.Pretty()
+
+	msgBytes, err := json.Marshal(m)
+	if err != nil {
+		return err
+	}
+	return cr.topic.Publish(cr.ctx, msgBytes)
+}
+
+// readLoop pulls messages from the pubsub topic and pushes them onto the Messages channel.
+func (cr *Room) readLoop() {
+	for {
+		msg, err := cr.sub.Next(cr.ctx)
+		if err != nil {
+			close(cr.Messages)
+			return
+		}
+		// only forward messages delivered by others
+		if msg.ReceivedFrom == cr.self {
+			continue
+		}
+		cm := new(Message)
+		err = json.Unmarshal(msg.Data, cm)
+		if err != nil {
+			continue
+		}
+		// send valid messages onto the Messages channel
+		cr.Messages <- cm
+	}
+}
+
+func topicName(roomName string) string {
+	return "chat-room:" + roomName
+}

pkg/utils/crypto.go

@@ -0,0 +1,63 @@
+package utils
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+)
+
+func AESEncrypt(plaintext string, key *[32]byte) (ciphertext string, err error) {
+	block, err := aes.NewCipher(key[:])
+	if err != nil {
+		return "", err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+
+	nonce := make([]byte, gcm.NonceSize())
+	_, err = io.ReadFull(rand.Reader, nonce)
+	if err != nil {
+		return "", err
+	}
+
+	cypher := gcm.Seal(nonce, nonce, []byte(plaintext), nil)
+
+	cyp := fmt.Sprintf("%x", cypher)
+	return cyp, nil
+}
+
+func AESDecrypt(text string, key *[32]byte) (plaintext string, err error) {
+	ciphertext, _ := hex.DecodeString(text)
+
+	block, err := aes.NewCipher(key[:])
+	if err != nil {
+		return "", err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+
+	if len(ciphertext) < gcm.NonceSize() {
+		return "", errors.New("malformed ciphertext")
+	}
+
+	decodedtext, err := gcm.Open(nil,
+		ciphertext[:gcm.NonceSize()],
+		ciphertext[gcm.NonceSize():],
+		nil,
+	)
+	if err != nil {
+		return "", err
+	}
+
+	return string(decodedtext), err
+}

pkg/utils/strings.go

@@ -0,0 +1,13 @@
+package utils
+
+import "math/rand"
+
+var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+func RandStringRunes(n int) string {
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letterRunes[rand.Intn(len(letterRunes))]
+	}
+	return string(b)
+}