Read servers from OpenVPN client cfg file and sort them by average ping rtt

openvpn-ping-servers.sh

#!/usr/bin/env bash
# libcrack.so
# Tue Jul 26 23:50:46 CEST 2016

if [[ -z "${1}" ]]; then
    printf "\n\tUsage: ${MYSELF##*/} <openvpn_client.conf>\n\n"
    exit 1
fi

MYSELF="$(realpath -e "${0#-*}")"
MYHOME="$(dirname ${MYSELF})"
TMP_FILE="$(mktemp /tmp/XXXXXXXX)"
CSV_FILE="${MYHOME}/openvpn-servers.csv"
CONFIG_FILE="${1}"

PING_NR=10
ALIGN_MAX=35
SERVERS=
SERVERS_NR=
PING_OPT="-q -n -c ${PING_NR}"

_read_server_list(){
    if [[ -f "${CONFIG_FILE}" ]]; then
        printf "\e[32m[+]\e[0m Reading servers from ${CONFIG_FILE}\n"
        SERVERS="$(grep remote "${CONFIG_FILE}" | awk '{print $2}' | sort -u)"
        SERVERS_NR="$(grep remote "${CONFIG_FILE}" | awk '{print $2}' | sort -u | wc -l | awk '{print $1}')"
        printf "\e[32m[+]\e[0m Pinging ${SERVERS_NR} servers\n"
    else
        printf "\e[31m[x]\e[0m Failed to read servers from \"${CONFIG_FILE}\"\n"
        exit 1
    fi
}

_benchmark_server_list(){
    local count=0

    for server in ${SERVERS}; do
        local align=$((${ALIGN_MAX}-${#server}))
        printf "\e[32m[+]\e[0m (${count}/${SERVERS_NR}) ${server} %${align}s"
        local avg="$(ping ${PING_OPT} "${server}" | egrep '^(round-trip|rtt)'|cut -f5 -d/)"

        if [[ $? == 0 ]]; then
            if [[ ${avg} =~ \d*\.\d* ]]; then
                printf "${avg}\n"
                printf "${server} ${avg}\n" >> "${TMP_FILE}"
            else
                printf "\e[31m${avg} (parse error)\e[0m\n"
            fi
        else
            printf "\e[31mNULL\e[0m (ping error)\n"
        fi
        count=$((${count}+1))
    done

    printf "\e[32m[+]\e[0m Finished pinging ${SERVERS_NR} servers\n"
    printf "\e[32m[+]\e[0m Online servers: ${count}\n"
}

_print_server_list(){
    while read line; do
        server="${line%% *}"
        msecs="${line##* }"
        if [[ ! -z "${server}" && ! -z "${msecs}" ]]; then
            printf "\e[32m[+]\e[0m ${msecs} ${server}\n"
        else
            printf "\e[31m[\e[0m${count}\e[31m]\e[0m failed to parse \"${line}\"\n"
        fi
    done < <(cat "${TMP_FILE}" | sort -k 2 -n)
}

_write_server_list(){
    if [[ -f "${TMP_FILE}" ]]; then
        printf "\e[32m[+]\e[0m Creating ${CSV_FILE}\n"
        cat "${TMP_FILE}" | sort -k 2 -n | tr ' ' ',' > "${CSV_FILE}"
        if [[ $? != 0 ]]; then
            printf "\e[31m[x]\e[0m Error creating ${CSV_FILE}\n"
        fi

        printf "\e[32m[+]\e[0m Deleting ${TMP_FILE}\n"
        rm "${TMP_FILE}"
        return $?

    else
        printf "\e[31m[x]\e[0m Error: cannot find ${TMP_FILE}\n"
        return 1
    fi
}

_read_server_list

_benchmark_server_list

_print_server_list

_write_server_list

exit 0