DNSCrypt watchdog

是咁的，dnscrypt好似成日有問題.......寫左個簡單script做monitor+restart

#!/bin/bash
DNS_TIMEOUT=5
RESET_WHEN_FAIL_COUNT=5
SLEEP_INTERVAL=3
RESTART_SERVICES="[email protected] dnscrypt-proxy@securedns dnsmasq"

fail_count=0
while true; do
    while true; do
            ping -c 1 8.8.8.8 > /dev/null && break
            echo Network not yet working...
        sleep 1
    done

    timeout ${DNS_TIMEOUT} dig $(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1).wtako.net > /dev/null
    if [ $? -eq 0 ]; then
        fail_count=0
    else
        fail_count=$((fail_count + 1))
        echo DNS FAIL $fail_count
    fi

    if [ $fail_count -ge ${RESET_WHEN_FAIL_COUNT} ]; then
        echo Reset dnscrypt proxies
        systemctl restart ${RESTART_SERVICES}
        fail_count=0
    fi

    sleep ${SLEEP_INTERVAL}
done