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name: Go
on:
push:
branches: [ main ]
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
with:
fetch-depth: 0
- name: Set up Go
uses: actions/setup-go@v2
with:
go-version: 1.17
- name: Test
run: go test -v ./...
- name: Lint source code
run: |
make tools lint
rm -rf .bin/
rm -rf dist/
- name: Set up Git actions user
uses: fregante/setup-git-user@v1
- name: Collect and save licenses
run: |
go install github.com/google/go-licenses@latest
rm -rf licenses
go-licenses save . --save_path="licenses" --ignore "github.com/bastiandoetsch/mullvad-best-server"
git add licenses
git commit -m "Updated licenses" && git push || echo "No changes to commit"
git clean -f && git reset --hard
- name: Create release tag
run: |
git tag "v$(git show -s --format=%cd --date=format:%Y%m%d.%H%M%S)"
git push --tags
- name: Release binaries with GoReleaser
uses: goreleaser/goreleaser-action@v2
env:
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
with:
args: release --rm-dist

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dist/
.idea
*.iml
*.eml

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.golangci.yaml Normal file
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linters:
disable-all: true
enable:
- deadcode
- errcheck
- gofmt
- goimports
- gosimple
- ineffassign
- misspell
- staticcheck
- structcheck
- unconvert
- unused
- varcheck
- govet
linters-settings:
goimports:
local-prefixes: github.com/bastiandoetsch/mullvad-best-server
output:
format: tab
run:
deadline: 10m

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project_name: mullvad-best-server
before:
hooks:
- go mod tidy
builds:
- flags:
- -trimpath
env:
- CGO_ENABLED=0
goos:
- linux
- windows
- darwin
mod_timestamp: "{{ .CommitTimestamp }}"
archives:
- replacements:
darwin: Darwin
linux: Linux
windows: Windows
386: i386
amd64: x86_64
format: binary
name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
checksum:
name_template: 'checksums.txt'
snapshot:
name_template: "{{ incpatch .Version }}-next"
changelog:
sort: asc
filters:
exclude:
- '^docs:'
- '^test:'

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LICENSE Normal file
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MIT License
Copyright (c) 2022 Bastian Doetsch
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.

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# project variables
PROJECT_NAME := mullvad-best-server
# build variables
.DEFAULT_GOAL = lint
BUILD_DIR := dist
DEV_GOARCH := $(shell go env GOARCH)
DEV_GOOS := $(shell go env GOOS)
## tools: Install required tooling.
.PHONY: tools
tools:
ifeq (,$(wildcard ./.bin/golangci-lint*))
@curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b .bin/ v1.44.2
else
@echo "==> Required tooling is already installed"
endif
## clean: Delete the build directory
.PHONY: clean
clean:
@echo "==> Removing '$(BUILD_DIR)' directory..."
@rm -rf $(BUILD_DIR)
## lint: Lint code with golangci-lint.
.PHONY: lint
lint: tools
@echo "==> Linting code with 'golangci-lint'..."
@.bin/golangci-lint run ./...
## test: Run all unit tests.
.PHONY: test
test:
@echo "==> Running unit tests..."
@mkdir -p $(BUILD_DIR)
@go test -count=1 -v -cover -coverprofile=$(BUILD_DIR)/coverage.out -parallel=4 ./...
## build: Build binary for default local system's OS and architecture.
.PHONY: build
build:
@echo "==> Building binary..."
@echo " running go build for GOOS=$(DEV_GOOS) GOARCH=$(DEV_GOARCH)"
# workaround for missing .exe extension on Windows
ifeq ($(OS),Windows_NT)
@go build -o $(BUILD_DIR)/$(PROJECT_NAME).$(DEV_GOOS).$(DEV_GOARCH).exe
else
@go build -o $(BUILD_DIR)/$(PROJECT_NAME).$(DEV_GOOS).$(DEV_GOARCH)
endif
.PHONY: run
run:
@echo "==> Running $(PROJECT_NAME)"
@go run main.go
help: Makefile
@echo "Usage: make <command>"
@echo ""
@echo "Commands:"
@sed -n 's/^##//p' $< | column -t -s ':' | sed -e 's/^/ /'

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# mullvad-best-server
![Build](https://github.com/bastiandoetsch/mullvad-best-server/actions/workflows/go.yml/badge.svg)
Determines the mullvad.net server with the lowest latency on macOS and Linux. On Windows, it can only check if the server is up.
The reason lies with the golang network libraries, according to the `go-ping` library, that is used under the hood for pinging:
```
Please note that accessing packet TTL values is not supported due to limitations in the Go x/net/ipv4 and x/net/ipv6 packages.
```
## Installation
Download binary from releases for your platform and unpack.
## Usage
### Default usage
Execute `mullvad-best-server`. It outputs the code, e.g. `de05`. You can then connect to it with e.g. wireguard using the normal shell scripts.
### Command line parameters
```angular2html
Usage of dist/mullvad-best-server_darwin_amd64/mullvad-best-server:
-c string
Server country code, e.g. ch for Switzerland (default "ch")
-l string
Log level. Allowed values: trace, debug, info, warn, error, fatal, panic (default "info")
-o string
Output format. 'json' outputs server json
-t string
Server type, e.g. wireguard (default "wireguard")
```
If you want the full server information, execute `mullvad-best-server -o json`. It returns the full json output of the server information.
The `-c` flag allows to give a country code. Else `ch` will be used.
## Background
The program uses `https://api.mullvad.net/www/relays/<SERVER_TYPE>/` to get the current server list, pings the ones with the right country
and outputs the server with the lowest ping.
## Integration into a script
I use it on my router like this (yes, I know I could have done the whole thing with jq and shell scripting, but wanted to use go for maintainability).
```
#!/bin/sh
set -e
LATEST_RELEASE=$(curl -sSL https://api.github.com/repos/bastiandoetsch/mullvad-best-server/releases/latest | jq -r '.assets[]| .browser_download_url' | grep Linux_arm64)
curl -sSL $LATEST_RELEASE > /root/mullvad-best-server
chmod +x /root/mullvad-best-server
/usr/bin/wg-quick down $(wg show|grep interface | cut -d: -f2) || echo "nothing to shut down"
/usr/bin/wg-quick up "mullvad-$(/root/mullvad-best-server -c de)"
```
## Troubleshooting
You may have to update your `/usr/bin/wg-quick` script for the new mullvad servers, as they have names longer than 15 chars. Replace `[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,15} ]]$` with `[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,25}$ ]]` and `[[ $CONFIG_FILE =~ (^|/)([a-zA-Z0-9_=+.-]{1,15})\.conf$ ]]` with `[[ $CONFIG_FILE =~ (^|/)([a-zA-Z0-9_=+.-]{1,25})\.conf$ ]]`

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module github.com/bastiandoetsch/mullvad-best-server
go 1.17
require (
github.com/go-ping/ping v1.1.0
github.com/rs/zerolog v1.27.0
)
require (
github.com/google/uuid v1.3.0 // indirect
github.com/mattn/go-colorable v0.1.12 // indirect
github.com/mattn/go-isatty v0.0.14 // indirect
golang.org/x/net v0.0.0-20220728211354-c7608f3a8462 // indirect
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4 // indirect
golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 // indirect
)

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github.com/coreos/go-systemd/v22 v22.3.3-0.20220203105225-a9a7ef127534/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
github.com/go-ping/ping v1.1.0 h1:3MCGhVX4fyEUuhsfwPrsEdQw6xspHkv5zHsiSoDFZYw=
github.com/go-ping/ping v1.1.0/go.mod h1:xIFjORFzTxqIV/tDVGO4eDy/bLuSyawEeojSm3GfRGk=
github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40=
github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/rs/xid v1.3.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
github.com/rs/zerolog v1.27.0 h1:1T7qCieN22GVc8S4Q2yuexzBb1EqjbgjSH9RohbMjKs=
github.com/rs/zerolog v1.27.0/go.mod h1:7frBqO0oezxmnO7GF86FY++uy8I0Tk/If5ni1G9Qc0U=
golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
golang.org/x/net v0.0.0-20220728211354-c7608f3a8462 h1:UreQrH7DbFXSi9ZFox6FNT3WBooWmdANpU+IfkT1T4I=
golang.org/x/net v0.0.0-20220728211354-c7608f3a8462/go.mod h1:YDH+HFinaLZZlnHAfSS6ZXJJ9M9t4Dl22yv3iI2vPwk=
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4 h1:uVc8UZUe6tr40fFVnUP5Oj+veunVezqYl9z7DYw9xzw=
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210315160823-c6e025ad8005/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 h1:WIoqL4EROvwiPdUtaip4VcDdpZ4kha7wBWZrbVKCIZg=
golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

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The MIT License (MIT)
Copyright (c) 2016 Cameron Sparr and contributors.
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.

27
licenses/github.com/google/uuid/LICENSE Normal file
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Copyright (c) 2009,2014 Google Inc. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

21
licenses/github.com/mattn/go-colorable/LICENSE Normal file
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@ -0,0 +1,21 @@
The MIT License (MIT)
Copyright (c) 2016 Yasuhiro Matsumoto
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.

9
licenses/github.com/mattn/go-isatty/LICENSE Normal file
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@ -0,0 +1,9 @@
Copyright (c) Yasuhiro MATSUMOTO <mattn.jp@gmail.com>
MIT License (Expat)
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.

21
licenses/github.com/rs/zerolog/LICENSE Normal file
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MIT License
Copyright (c) 2017 Olivier Poitrey
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.

27
licenses/golang.org/x/net/LICENSE Normal file
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Copyright (c) 2009 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

27
licenses/golang.org/x/sync/errgroup/LICENSE Normal file
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@ -0,0 +1,27 @@
Copyright (c) 2009 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

27
licenses/golang.org/x/sys/LICENSE Normal file
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Copyright (c) 2009 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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package main
import (
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"net/http"
"runtime"
"strings"
"time"
"github.com/go-ping/ping"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
)
func main() {
var outputFlag = flag.String("o", "", "Output format. 'json' outputs server json")
var countryFlag = flag.String("c", "ch", "Server country code, e.g. ch for Switzerland")
var typeFlag = flag.String("t", "wireguard", "Server type, e.g. wireguard")
var logLevel = flag.String("l", "info", "Log level. Allowed values: trace, debug, info, warn, error, fatal, panic")
var ownedFlag = flag.String("m", "true", "Server owned by Mullvad")
flag.Parse()
level, err := zerolog.ParseLevel(*logLevel)
if err != nil {
log.Fatal().Err(err).Msg("Unable to set log level")
}
zerolog.SetGlobalLevel(level)
servers := getServers(*typeFlag)
bestIndex := selectBestServerIndex(servers, *countryFlag, *ownedFlag)
if bestIndex == -1 {
log.Fatal().Str("country", *countryFlag).Msg("No servers for country found.")
}
best := servers[bestIndex]
log.Debug().Interface("server", best).Msg("Best latency server found.")
hostname := strings.TrimSuffix(best.Hostname, "-wireguard")
if *outputFlag != "json" {
fmt.Println(hostname)
} else {
serverJson, err := json.Marshal(best)
if err != nil {
log.Fatal().Err(err).Msg("Couldn't marshal server information to Json")
}
fmt.Println(string(serverJson))
}
}
func getOwned(ownedInput string) bool {
if ownedInput == "true" {
return true
} else {
return false
}
}
func selectBestServerIndex(servers []server, country string, ownedInput string) int {
bestIndex := -1
var bestPing time.Duration
for i, server := range servers {
if getOwned(ownedInput) == true {
if server.Active && server.CountryCode == country && server.Owned == true {
duration, err := serverLatency(server)
if err == nil {
if bestIndex == -1 || bestPing > duration {
bestIndex = i
bestPing = duration
}
} else {
log.Err(err).Msg("Error determining the server latency via ping.")
}
}
} else {
if server.Active && server.CountryCode == country {
duration, err := serverLatency(server)
if err == nil {
if bestIndex == -1 || bestPing > duration {
bestIndex = i
bestPing = duration
}
} else {
log.Err(err).Msg("Error determining the server latency via ping.")
}
}
}
}
return bestIndex
}
func getServers(serverType string) []server {
resp, err := http.Get("https://api.mullvad.net/www/relays/" + serverType + "/")
if err != nil {
log.Fatal().Err(err).Msg("Couldn't retrieve servers")
}
responseBody, err := ioutil.ReadAll(resp.Body)
defer func(Body io.ReadCloser) {
err := Body.Close()
if err != nil {
log.Err(err)
}
}(resp.Body)
if err != nil {
log.Fatal().Err(err)
}
var servers []server
err = json.Unmarshal(responseBody, &servers)
if err != nil {
log.Fatal().Err(err).Msg("couldn't unmarshall server json")
}
return servers
}
//goland:noinspection GoBoolExpressions
func serverLatency(s server) (time.Duration, error) {
pinger, err := ping.NewPinger(s.Ipv4AddrIn)
if runtime.GOOS == "windows" {
pinger.SetPrivileged(true)
}
pinger.Count = 1
if err != nil {
return 0, err
}
var duration time.Duration
pinger.OnRecv = func(pkt *ping.Packet) {
log.Debug().Str("Server", s.Hostname).IPAddr("IP", pkt.IPAddr.IP).Dur("RTT", pkt.Rtt).Msg("Added server latency.")
duration = pkt.Rtt
}
err = pinger.Run()
return duration, err
}
type server struct {
Hostname string `json:"hostname"`
CountryCode string `json:"country_code"`
CountryName string `json:"country_name"`
CityCode string `json:"city_code"`
CityName string `json:"city_name"`
Active bool `json:"active"`
Owned bool `json:"owned"`
Provider string `json:"provider"`
Ipv4AddrIn string `json:"ipv4_addr_in"`
Ipv6AddrIn string `json:"ipv6_addr_in"`
NetworkPortSpeed int `json:"network_port_speed"`
Pubkey string `json:"pubkey"`
MultihopPort int `json:"multihop_port"`
SocksName string `json:"socks_name"`
}