bind.sh

#!/bin/bash
#    GPL, of course, 
#    Main config file when calling named
configCore="/etc/bind/named.conf"
#    Where to write TSIG and zones configuration
configCustom="/etc/bind/named.conf.local"

function initMasterZones {

    echo "Creating Master Zone Configuration"
    for domain in $(ls /etc/bind/zones/)
    do
        named-checkzone $domain /etc/bind/zones/$domain
        if [ $? -ne 0 ]
        then
            exit 1;
        else
            if [ -n "$BIND_SLAVE_IP" ]
            then
#    IP AUTH MODE
                echo -e "zone \"$domain\" {\n\ttype master;\n\tfile \"/etc/bind/zones/$domain\";\n\tallow-transfer { $BIND_SLAVE_IP; };\n};\n\n" >> $configCustom
            else
#    Defaults to docker0. We don't want everyone to be able to perform AXFR!
                echo -e "zone \"$domain\" {\n\ttype master;\n\tfile \"/etc/bind/zones/$domain\";\n\tallow-transfer { 172.16.0.0/12; };\n};\n\n" >> $configCustom
            fi
        fi
    done

}

function initSlaveZones {

    for domain in $(ls /etc/bind/zones/)
    do
        echo "Creating $domain config"
        echo -e "zone \"$domain\" {\n\ttype slave;\n\tfile \"$domain\";\n\tmasters { $BIND_MASTER_IP; };\n\tnotify no;\n};\n\n" >> $configCustom
    done

}

if [ "$BIND_MASTER" = "true" ]
then
    initMasterZones
elif [ -n "$BIND_MASTER_IP" ]
then
    initSlaveZones
else
    echo "Missing required variables: BIND_MASTER==true+BIND_SLAVE_IP for master or BIND_MASTER_IP for slave"
    exit 1
fi

/usr/sbin/named -c $configCore -4 -g