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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Script to test latency of Mullvad WireGuard relays and generate a PAC file.
Uses raw sockets for cross-platform ICMP ping functionality.
"""
import argparse
import socket
import statistics
import sys
import time
from concurrent.futures import ThreadPoolExecutor
from typing import List, TypedDict
import requests
from loguru import logger
class Relay(TypedDict):
hostname: str
location: str
socks5: str
class RelayResult(TypedDict):
relay: Relay
latency: float
def ping_host(hostname: str, ping_count: int, ping_timeout: int) -> float:
try:
try:
ip_address = socket.gethostbyname(hostname)
except socket.gaierror:
return float("inf")
rtts = []
for _ in range(ping_count):
try:
start = time.time()
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(ping_timeout)
s.connect((ip_address, 1080))
s.close()
rtts.append((time.time() - start) * 1000)
except (socket.timeout, socket.error):
rtts.append(float("inf"))
valid_rtts = [rtt for rtt in rtts if rtt != float("inf")]
return statistics.mean(valid_rtts) if valid_rtts else float("inf")
except Exception as e:
logger.error(f"Error pinging {hostname}: {str(e)}")
return float("inf")
def get_relays(relays_url: str, location_prefixes: List[str]) -> List[Relay]:
try:
response = requests.get(relays_url, timeout=5).json()
relays = []
for relay in response["wireguard"]["relays"]:
if (
any(
relay["location"].startswith(prefix) for prefix in location_prefixes
)
and relay["active"] is True
):
host = "{}.relays.mullvad.net".format(
relay["hostname"].replace("wg-", "wg-socks5-")
)
relays.append(
{
"hostname": host,
"location": relay["location"],
"socks5": f"SOCKS5 {host}:1080",
}
)
return relays
except Exception as e:
logger.error(f"Failed to fetch relays: {str(e)}")
return []
def measure_latency(
relays: List[Relay], ping_count: int, ping_timeout: int
) -> List[RelayResult]:
results = []
with ThreadPoolExecutor(max_workers=10) as executor:
futures = []
for relay in relays:
futures.append(
(
relay,
executor.submit(
ping_host, relay["hostname"], ping_count, ping_timeout
),
)
)
processed = 0
total = len(relays)
for relay, future in futures:
latency = future.result()
results.append({"relay": relay, "latency": latency})
processed += 1
if latency == float("inf"):
logger.warning(f"[{processed}/{total}] {relay['hostname']}: timed out")
else:
logger.info(
f"[{processed}/{total}] {relay['hostname']}: {latency:.2f} ms"
)
results.sort(key=lambda x: x["latency"])
return results
def generate_pac(ranked_relays: List[RelayResult]) -> str:
pac_content = """function FindProxyForURL(url, host) {
var proxies = [
"""
for result in ranked_relays:
pac_content += f' "{result["relay"]["socks5"]}",\n'
pac_content += """ ];
var i = Math.floor(Math.random() * proxies.length);
return proxies[i];
}"""
return pac_content
def main() -> int:
parser = argparse.ArgumentParser(
description="Mullvad WireGuard Relay Latency Tester and PAC Generator"
)
parser.add_argument(
"--relays-url",
default="https://api.mullvad.net/public/relays/wireguard/v2",
help="URL for Mullvad relays",
)
parser.add_argument(
"--pac-file", default="mullvad_proxy.pac", help="Output PAC file"
)
parser.add_argument(
"--ping-count", default=5, type=int, help="Number of connectivity checks"
)
parser.add_argument(
"--ping-timeout",
default=1,
type=int,
help="Timeout (seconds) for each connectivity check",
)
parser.add_argument(
"--max-latency",
default=None,
type=float,
help="Ignore relays with latency above this threshold (ms)",
)
parser.add_argument(
"--location-prefixes",
default=[""],
nargs="+",
help="Location prefixes to filter relays",
)
args = parser.parse_args()
logger.info(f"Using location prefixes: {args.location_prefixes}")
logger.info("Fetching relays...")
relays = get_relays(args.relays_url, args.location_prefixes)
if not relays:
logger.error("No relays found!")
return 1
logger.info("Measuring latency...")
ranked_relays = measure_latency(relays, args.ping_count, args.ping_timeout)
working_relays = [r for r in ranked_relays if r["latency"] != float("inf")]
if args.max_latency is not None:
working_relays = [r for r in working_relays if r["latency"] <= args.max_latency]
logger.info(
f"Found {len(working_relays)} working relays out of {len(relays)} total."
)
if not working_relays:
logger.error("No working relays found under the specified conditions!")
return 2
logger.info("Sorted relays by latency (lowest first):")
for i, result in enumerate(working_relays):
logger.info(
f"{i + 1}. {result['relay']['hostname']}: {result['latency']:.2f} ms"
)
logger.info("Generating PAC file content...")
pac_content = generate_pac(working_relays)
logger.info(f"Saving PAC file to {args.pac_file}")
try:
with open(args.pac_file, "w", encoding="utf-8") as f:
f.write(pac_content)
logger.success(f"PAC file saved with {len(working_relays)} working relays.")
except Exception as e:
logger.error(f"Failed to save PAC file: {str(e)}")
return 3
return 0
if __name__ == "__main__":
start_time = time.time()
exit_code = 0
try:
exit_code = main()
except Exception as e:
logger.error(f"Script failed: {str(e)}")
exit_code = 4
finally:
logger.info(f"Total execution time: {time.time() - start_time:.2f} seconds")
sys.exit(exit_code)
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