DD-WRT script for selecting an optimal ProtonVPN server

vpn-refresh.sh

#!/bin/sh

# https://collinmbarrett.com/protonvpn-dd-wrt-api-script/

# specify PATH to run from cron
PATH=/bin:/usr/bin:/sbin:/usr/sbin:/jffs/sbin:/jffs/bin:/jffs/usr/sbin:/jffs/usr/bin:/mmc/sbin:/mmc/bin:/mmc/usr/sbin:/mmc/usr/bin:/opt/sbin:/opt/bin:/opt/usr/sbin:/opt/usr/bin

# kill openvpn
PID=$(pidof openvpn)
kill -s SIGTERM "$PID"
while $(kill -0 "$PID" 2>/dev/null); do
  sleep 1
done

# fetch ProtonVPN server info
LOGICALS=$(curl -s -H "Cache-Control: no-cache" -H "Accept: application/json" https://api.protonmail.ch/vpn/logicals)

# query for optimal server
IPSTRING=$(echo "$LOGICALS" | jq '.LogicalServers | map(select(.Status == 1 and .Tier == 2 and (.Name | (startswith("US-TX#") or startswith("US-GA#")) and (endswith("TOR") | not)))) | [sort_by(.Score, .Load)[]][0] | .Servers[0].EntryIP')

# update openvpn config
if [ -n "$IPSTRING" ]
then
  sed -i '/^remote/d' /tmp/openvpncl/openvpn.conf
  IPSTRING="${IPSTRING%\"}"
  IP="${IPSTRING#\"}"
  REMOTE="remote ${IP} 443"
  echo $REMOTE >> /tmp/openvpncl/openvpn.conf
fi

# restart openvpn
openvpn --config /tmp/openvpncl/openvpn.conf --route-up /tmp/openvpncl/route-up.sh --route-pre-down /tmp/openvpncl/route-down.sh --daemon

Blog post: https://collinmbarrett.com/protonvpn-dd-wrt-api-script/