remove old relays file

- Added IPv4 endpoint address as a new column in the results table
- Adjusted column formatting to accommodate the new 15-character wide column
- Makes it easier to see which IP addresses correspond to each relay

.gitignore

@@ -1 +1 @@
-cmd/mullvadclosest/mullvadclosest
+bin

LICENSE

@@ -0,0 +1,14 @@
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+                    Version 2, December 2004
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.
+

Makefile

@@ -2,3 +2,15 @@ default: build
 
 build:
 	@go build -o bin/ ./...
+
+run:
+	sudo go run ./cmd/mullvadclosest/*.go
+
+test:
+	go test -v ./...
+
+fmt:
+	go fmt ./...
+
+lint:
+	golangci-lint run

README.md

@@ -0,0 +1,156 @@
+# mullvadclosest
+
+A small golang program that checks your latency to all of the known mullvad
+relays.
+
+This will use your local relay database as installed by the mullvad client
+if it finds it. Otherwise, it will use a bundled copy which may be a bit
+out of date. If that happens, contact me and I'll update it.
+
+This will show you the top 25 lowest latency relays (VPN servers) to you,
+and the 5 highest for comparison.
+
+# Errata
+
+The go ICMP ping library I'm using doesn't work on OSX if you're not root, so the
+program requires it. Oh well.
+
+# Usage
+
+Make sure you're **disconnected** from the VPN when you run this. It needs
+to be able to ping the relays directly, and if you're connected to the VPN
+you'll get the latency through the VPN server to which you're connected,
+which is not what you want.
+
+Run:
+
+```
+GOPROXY=direct go run sneak.berlin/go/mullvadclosest/cmd/mullvadclosest@4dd5e871f830ff62bb30c2290623ad9d8c4d4554
+```
+
+The GOPROXY=direct means to download the code directly from my servers, not
+the Google-operated golang module proxy. Given that you're running this
+program as root from a random place on the internet, downloading it directly
+from me avoids the case where Google can serve you arbitrary code that runs
+on your machine.
+
+The full git commit hash is provided to ensure that you're running the
+specific version of the code that I've tested and that you're expecting to
+run. Don't do "git run <whatever>@latest" because it's just granting random
+people code exec on your machine. (Same goes for docker images that use
+_any_ tag that uses `:` instead of a specific hash identified by `@`.)
+
+# Example output
+
+Run from the southwestern US:
+
+```
+root@bastion:~# GOPROXY=direct go run sneak.berlin/go/mullvadclosest/cmd/mullvadclosest@latest
+Checking liveness 100% |███████████████████████████████████████████████████████████████████████████████████████████████| (684/684, 78 it/s)
+Measuring latency 100% |███████████████████████████████████████████████████████████████████████████████████████████████| (673/673, 7 it/s)
+Total relays: 684
+Live relays: 673
+Dead relays: 11
+Min latency: 11.240837ms (Relay(hostname=us-lax-wg-203, ip=169.150.203.28, country=USA))
+Max latency: 351.145942ms (Relay(hostname=sg-sin-wg-002, ip=138.199.60.15, country=Singapore))
+Median latency: 152.235439ms (Relay(hostname=de-fra-wg-106, ip=146.70.117.34, country=Germany))
+Mean latency: 122.094918ms
+Stddev latency: 63.354381ms
+
+Country              City                 Hostname                       Latency
+USA                  Los Angeles, CA      us-lax-wg-203                  11.240837ms
+USA                  Los Angeles, CA      us-lax-wg-303                  11.414964ms
+USA                  Los Angeles, CA      us-lax-ovpn-201                11.575832ms
+USA                  Los Angeles, CA      us-lax-wg-404                  12.160305ms
+USA                  Los Angeles, CA      us-lax-wg-102                  12.189879ms
+USA                  Los Angeles, CA      us-lax-ovpn-402                12.37345ms
+USA                  Los Angeles, CA      us-lax-wg-403                  12.724075ms
+USA                  Los Angeles, CA      us-lax-wg-401                  12.802629ms
+USA                  Los Angeles, CA      us-lax-ovpn-202                13.044014ms
+USA                  Los Angeles, CA      us-lax-wg-202                  13.129124ms
+USA                  Los Angeles, CA      us-lax-wg-406                  13.655117ms
+USA                  Los Angeles, CA      us-lax-wg-302                  13.804244ms
+USA                  Los Angeles, CA      us-lax-wg-501                  13.854577ms
+USA                  Los Angeles, CA      us-lax-wg-502                  14.668269ms
+USA                  Los Angeles, CA      us-lax-br-401                  15.198631ms
+USA                  Los Angeles, CA      us-lax-wg-405                  15.47022ms
+USA                  Los Angeles, CA      us-lax-ovpn-102                15.764457ms
+USA                  Los Angeles, CA      us-lax-wg-503                  15.918306ms
+USA                  Los Angeles, CA      us-lax-ovpn-401                16.264245ms
+USA                  Los Angeles, CA      us-lax-wg-103                  16.35017ms
+USA                  Los Angeles, CA      us-lax-wg-201                  16.469779ms
+USA                  Los Angeles, CA      us-lax-ovpn-101                16.655777ms
+USA                  Los Angeles, CA      us-lax-ovpn-403                17.289434ms
+USA                  Los Angeles, CA      us-lax-wg-402                  18.19131ms
+USA                  Los Angeles, CA      us-lax-wg-101                  18.290308ms
+
+South Africa         Johannesburg         za-jnb-wg-001                  288.186466ms
+Singapore            Singapore            sg-sin-wg-001                  342.030852ms
+Singapore            Singapore            sg-sin-wg-003                  346.614045ms
+Singapore            Singapore            sg-sin-wg-002                  351.145942ms
+```
+
+Run from an LTE connection in Türkiye:
+
+```
+akrotiri:~$ GOPROXY=direct sudo go run sneak.berlin/go/mullvadclosest/cmd/mullvadclosest@latest
+Checking liveness 100% |███████████████████████████████████████████████████████████████████████████████████████████| (684/684, 25 it/s)
+Measuring latency 100% |███████████████████████████████████████████████████████████████████████████████████████████| (602/602, 5 it/s)
+Total relays: 684
+Live relays: 602
+Dead relays: 82
+Min latency: 87.088ms (Relay(hostname=nl-ams-ovpn-003, ip=185.65.134.73, country=Netherlands))
+Max latency: 560.733ms (Relay(hostname=th-bkk-wg-001, ip=156.59.50.194, country=Thailand))
+Median latency: 155.925ms (Relay(hostname=gr-ath-wg-101, ip=149.102.246.2, country=Greece))
+Mean latency: 175.519705ms
+Stddev latency: 84.258738ms
+
+Country              City                 Hostname                       Latency
+Netherlands          Amsterdam            nl-ams-ovpn-003                87.088ms
+Netherlands          Amsterdam            nl-ams-wg-006                  87.523ms
+Netherlands          Amsterdam            nl-ams-wg-101                  89.472ms
+Netherlands          Amsterdam            nl-ams-wg-201                  91.061ms
+Netherlands          Amsterdam            nl-ams-ovpn-005                91.272ms
+Netherlands          Amsterdam            nl-ams-wg-004                  91.527ms
+Belgium              Brussels             be-bru-wg-102                  92.082ms
+Netherlands          Amsterdam            nl-ams-ovpn-004                93.036ms
+Belgium              Brussels             be-bru-wg-101                  93.22ms
+Germany              Frankfurt            de-fra-wg-004                  94.146ms
+Netherlands          Amsterdam            nl-ams-ovpn-001                94.465ms
+Netherlands          Amsterdam            nl-ams-wg-007                  94.578ms
+Germany              Frankfurt            de-fra-ovpn-003                94.681ms
+Germany              Dusseldorf           de-dus-wg-002                  95.224ms
+Netherlands          Amsterdam            nl-ams-wg-001                  95.555ms
+UK                   London               gb-lon-wg-202                  96.297ms
+UK                   London               gb-lon-wg-201                  96.468ms
+Germany              Frankfurt            de-fra-ovpn-006                96.544ms
+Germany              Frankfurt            de-fra-wg-006                  96.58ms
+UK                   London               gb-lon-ovpn-002                96.775ms
+UK                   London               gb-lon-wg-203                  96.822ms
+Germany              Dusseldorf           de-dus-wg-001                  96.865ms
+Belgium              Brussels             be-bru-ovpn-101                96.869ms
+UK                   London               gb-lon-ovpn-301                96.922ms
+UK                   London               gb-lon-ovpn-005                97.231ms
+
+Australia            Perth                au-per-wg-302                  438.455ms
+Singapore            Singapore            sg-sin-ovpn-102                444.711ms
+Indonesia            Jakarta              id-jpu-wg-002                  504.1ms
+Thailand             Bangkok              th-bkk-wg-001                  560.733ms
+```
+
+# Author
+
+sneak &lt;[sneak@sneak.berlin](mailto:sneak@sneak.berlin)&gt;
+
+# License
+
+[WTFPL](./LICENSE)
+
+Do with it what you will. There is no warranty, express or implied,
+including but not limited to merchantability or fitness for a particular
+purpose. Use at your own risk. Maybe clone it and read the code before
+you run random shit from some weirdo from the internet as root.
+
+# Source
+
+https://sneak.berlin/go/mullvadclosest

cmd/mullvadclosest/main.go

@@ -2,8 +2,9 @@ package main
 
 import (
 	"encoding/json"
+	"flag"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"math"
 	"math/rand"
 	"net/http"
@@ -15,6 +16,9 @@ import (
 	"github.com/schollz/progressbar/v3"
 )
 
+// Package-level variable for debug flag
+var debugMode bool
+
 // RelayLatency holds a relay and its associated latency
 type RelayLatency struct {
 	Relay   Relay
@@ -46,7 +50,7 @@ func livenessWorker(id int, jobs <-chan Relay, results chan<- RelayLatency, wg *
 		if err == nil && isLive {
 			results <- RelayLatency{Relay: relay, Latency: latency}
 		}
-		bar.Add(1)
+		_ = bar.Add(1)
 	}
 }
 
@@ -60,8 +64,10 @@ func latencyWorker(id int, jobs <-chan RelayLatency, results chan<- RelayLatency
 				Relay:   relayLatency.Relay,
 				Latency: latency,
 			}
+		} else if debugMode {
+			fmt.Printf("Debug: Error measuring latency for %s: %v\n", relayLatency.Relay.Hostname, err)
 		}
-		bar.Add(1)
+		_ = bar.Add(1)
 	}
 }
 
@@ -180,13 +186,14 @@ func PrintRelayLatencies(relayLatencies []RelayLatency, totalRelays int, deadRel
 		fmt.Println()
 	}
 
-	fmt.Printf("%-20s %-20s %-30s %s\n", "Country", "City", "Hostname", "Latency")
+	fmt.Printf("%-20s %-20s %-30s %-15s %s\n", "Country", "City", "Hostname", "IPv4 Address", "Latency")
 	for i, rl := range relayLatencies {
 		if i < 25 || i >= len(relayLatencies)-4 {
-			fmt.Printf("%-20s %-20s %-30s %v\n",
+			fmt.Printf("%-20s %-20s %-30s %-15s %v\n",
 				rl.Relay.Location.Country,
 				rl.Relay.Location.City,
 				rl.Relay.Hostname,
+				rl.Relay.Ipv4AddrIn,
 				rl.Latency)
 		}
 		if i == 24 {
@@ -203,7 +210,7 @@ func CheckMullvadExitIP() (bool, error) {
 	}
 	defer resp.Body.Close()
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return false, fmt.Errorf("failed to read response body: %v", err)
 	}
@@ -217,6 +224,14 @@ func CheckMullvadExitIP() (bool, error) {
 }
 
 func main() {
+	// Define force flag
+	force := flag.Bool("force", false, "Force execution even when connected to VPN")
+	debug := flag.Bool("debug", false, "Enable debug output")
+	flag.Parse()
+
+	// Set the global debug mode
+	debugMode = *debug
+
 	currentUser, err := user.Current()
 	if err != nil {
 		panic("Failed to get current user")
@@ -231,8 +246,9 @@ func main() {
 		panic(fmt.Sprintf("Error checking Mullvad exit IP: %v", err))
 	}
 
-	if isMullvadExitIP {
+	if isMullvadExitIP && !*force {
 		fmt.Println("This program is designed to test latency between your actual IP and the Mullvad VPN servers. Please disconnect from the VPN and run the program again.")
+		fmt.Println("Use -force flag to bypass this check.")
 		return
 	}
 

cmd/mullvadclosest/relays.go

@@ -3,7 +3,6 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"time"
 
@@ -46,11 +45,21 @@ func (r Relay) CheckLiveness() (bool, time.Duration, error) {
 	pinger.Count = 1
 	pinger.Timeout = 3 * time.Second // Increased timeout for the single ping
 	pinger.SetPrivileged(true)
-	pinger.Run()
+	if err := pinger.Run(); err != nil {
+		return false, 0, err
+	}
 	stats := pinger.Statistics()
 	if stats.PacketsRecv == 0 {
 		return false, 0, nil
 	}
+
+	// Validate that we don't have a zero latency for a successful ping
+	if stats.AvgRtt == 0 {
+		// Return as live but with no initial latency measurement
+		// The actual latency will be measured in MeasureLatency
+		return true, time.Duration(1), nil
+	}
+
 	return true, stats.AvgRtt, nil
 }
 
@@ -64,8 +73,28 @@ func (r Relay) MeasureLatency() (time.Duration, error) {
 	pinger.Interval = 1 * time.Second // Adding interval between pings
 	pinger.Timeout = 10 * time.Second // Increased overall timeout
 	pinger.SetPrivileged(true)
-	pinger.Run()
+	if err := pinger.Run(); err != nil {
+		return 0, err
+	}
 	stats := pinger.Statistics()
+
+	// Debug output
+	if debugMode && (stats.MinRtt == 0 || stats.AvgRtt == 0) {
+		fmt.Printf("Debug: %s (%s) - PacketsSent: %d, PacketsRecv: %d, MinRtt: %v, AvgRtt: %v, MaxRtt: %v\n",
+			r.Hostname, r.Ipv4AddrIn, stats.PacketsSent, stats.PacketsRecv,
+			stats.MinRtt, stats.AvgRtt, stats.MaxRtt)
+	}
+
+	// Validate the statistics - if MinRtt is 0 but we received packets, something is wrong
+	if stats.PacketsRecv > 0 && stats.MinRtt == 0 {
+		// Use average RTT if available and non-zero
+		if stats.AvgRtt > 0 {
+			return stats.AvgRtt, nil
+		}
+		// If all RTT values are 0, this is likely a bug - return an error
+		return 0, fmt.Errorf("invalid zero latency for relay %s", r.Hostname)
+	}
+
 	return stats.MinRtt, nil
 }
 
@@ -110,7 +139,7 @@ func ParseRelayData() ([]Relay, error) {
 			return nil, fmt.Errorf("failed to read embedded file: %v", err)
 		}
 	} else {
-		fileData, err = ioutil.ReadFile(filePath)
+		fileData, err = os.ReadFile(filePath)
 		if err != nil {
 			return nil, fmt.Errorf("failed to read file: %v", err)
 		}

embed.go

@@ -4,7 +4,7 @@ import (
 	"embed"
 )
 
-//go:embed relays.2024-06-04.json
+//go:embed relays.2025-07-14.json
 var fs embed.FS
 
 func GetEmbeddedFile(name string) ([]byte, error) {
@@ -12,5 +12,5 @@ func GetEmbeddedFile(name string) ([]byte, error) {
 }
 
 func GetRelays() ([]byte, error) {
-	return GetEmbeddedFile("relays.2024-06-04.json")
+	return GetEmbeddedFile("relays.2025-07-14.json")
 }

go.mod

@@ -1,15 +1,20 @@
 module sneak.berlin/go/mullvadclosest
 
-go 1.22.3
+go 1.23.0
+
+toolchain go1.24.4
+
+require (
+	github.com/go-ping/ping v1.1.0
+	github.com/schollz/progressbar/v3 v3.14.3
+)
 
 require (
-	github.com/go-ping/ping v1.1.0 // indirect
 	github.com/google/uuid v1.2.0 // indirect
 	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/schollz/progressbar/v3 v3.14.3 // indirect
-	golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4 // indirect
+	golang.org/x/net v0.42.0 // indirect
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
-	golang.org/x/sys v0.20.0 // indirect
-	golang.org/x/term v0.20.0 // indirect
+	golang.org/x/sys v0.34.0 // indirect
+	golang.org/x/term v0.33.0 // indirect
 )

go.sum

@@ -1,4 +1,5 @@
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+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/go-ping/ping v1.1.0 h1:3MCGhVX4fyEUuhsfwPrsEdQw6xspHkv5zHsiSoDFZYw=
 github.com/go-ping/ping v1.1.0/go.mod h1:xIFjORFzTxqIV/tDVGO4eDy/bLuSyawEeojSm3GfRGk=
@@ -8,25 +9,32 @@ github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213/go.mod h1:vNUNkEQ1
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
 github.com/schollz/progressbar/v3 v3.14.3 h1:oOuWW19ka12wxYU1XblR4n16wF/2Y1dBLMarMo6p4xU=
 github.com/schollz/progressbar/v3 v3.14.3/go.mod h1:aT3UQ7yGm+2ZjeXPqsjTenwL3ddUiuZ0kfQ/2tHlyNI=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4 h1:b0LrWgu8+q7z4J+0Y3Umo5q1dL7NXBkKBWkaVkAq17E=
 golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
+golang.org/x/net v0.42.0 h1:jzkYrhi3YQWD6MLBJcsklgQsoAcw89EcZbJw8Z614hs=
+golang.org/x/net v0.42.0/go.mod h1:FF1RA5d3u7nAYA4z2TkclSCKh68eSXtiFwcWQpPXdt8=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/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 h1:pDMpM2zh2MT0kHy037cKlSby2nEhD50SYqwQk76Nm40=
 golang.org/x/sys v0.0.0-20210315160823-c6e025ad8005/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
 golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.34.0 h1:H5Y5sJ2L2JRdyv7ROF1he/lPdvFsd0mJHFw2ThKHxLA=
+golang.org/x/sys v0.34.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.20.0 h1:VnkxpohqXaOBYJtBmEppKUG6mXpi+4O6purfc2+sMhw=
 golang.org/x/term v0.20.0/go.mod h1:8UkIAJTvZgivsXaD6/pH6U9ecQzZ45awqEOzuCvwpFY=
+golang.org/x/term v0.33.0 h1:NuFncQrRcaRvVmgRkvM3j/F00gWIAlcmlB8ACEKmGIg=
+golang.org/x/term v0.33.0/go.mod h1:s18+ql9tYWp1IfpV9DmCtQDDSRBUjKaw9M1eAv5UeF0=
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