#
# /usr/local/etc/nsd/nsd.conf
# See nsd.conf(5)
#
# References
# ----------
# * NSD DNS Server Tutorial
#   https://calomel.org/nsd_dns.html
# * Host Your own DNS, without Sacrificing Reliability
#   https://blog.tom-fitzhenry.me.uk/2012/12/host-your-own-dns-without-sacrificing-reliability.html
# * Stealth (a.k.a. DMZ or Hidden Master) Name Server
#   http://www.zytrax.com/books/dns/ch4/#stealth
# * Free Secondary/slave DNS services
#   http://www.frankb.us/dns/
# * Free Secondary (slave) DNS
#   https://bornoe.org/blog/2015/10/free-secondary-slave-dns/
#
#
# Aaron LI
#

# NOTE:
# Authoritative master server in *stealth* mode, i.e., hidden master.
#
# Due to the importance of the DNS, many registrars require that at least 2
# name servers are provided from different machines or even from different
# countries.  Maybe you could create another glue record with the same IP
# address to fool the registrar, but some registrars may further check the
# IP addresses.  Nevertheless, it is highly unrecommended to host your own
# DNS on single machine, and secondary/slave DNS services should be used.
# One can even configure a hidden master DNS with several slaves, which
# can greatly reduce the traffic to the (small) master DNS, since only the
# configured slaves have access to it, and the better security (avoid DDoS).

server:
    # Specify the interfaces to bind.
    # Default are the wildcard interfaces 0.0.0.0 and ::0).
    ip-address: {{ network.ipv4.address }}
    ip-address: {{ network.ipv6.address }}

    # Use the reuseport socket option for performance.
    # Default: no.
    reuseport: yes

    # Listen on IPv4 connections
    do-ip4: yes

    # Listen on IPv6 connections
    do-ip6: yes

    # The file used to store the compiled zone information.
    # If set to "" then no disk-database is used, less memory used
    # but zone updates are not (immediately) spooled to disk.
    #database: "/var/db/nsd/nsd.db"
    database: ""

    # Don't answer VERSION.BIND and VERSION.SERVER CHAOS class queries
    hide-version: yes

    # Identify the server (CH TXT ID.SERVER entry)
    identity: ""

    # Statistics are produced every number of seconds.
    # NOTE: requires BIND 8 statistics, which is disabled in the package
    #statistics: 7200

    # Verbosity level (0, 1, 2).
    # Level 0 will print warnings and errors, and other events that are
    # important to keep NSD running.
    verbosity: 1

    # Log messages to file.  Default to stderr and syslog (with
    # facility LOG_DAEMON).  stderr disappears when daemon goes to bg.
    #logfile: "/var/log/nsd.log"


# Remote control config section.
#
remote-control:
    # Enable remote control with nsd-control(8) here.
    control-enable: yes

    # Interfaces listened to for control.  Default is on localhost.
    control-interface: 127.0.0.1
    control-interface: ::1

    # Server and nsd-control key and certificate files for remote control.
    # Set up the keys and certificates with nsd-control-setup.
    server-key-file: "/usr/local/etc/nsd/nsd_server.key"
    server-cert-file: "/usr/local/etc/nsd/nsd_server.pem"
    control-key-file: "/usr/local/etc/nsd/nsd_control.key"
    control-cert-file: "/usr/local/etc/nsd/nsd_control.pem"


# Patterns have zone configuration that are shared by one or more zones.
#
pattern:
    # Name by which the pattern is referred to
    name: "stealth_zones"

    # The zonefile for the zones that use this pattern.
    # If relative then from the zonesdir (inside the chroot).
    # the name is processed: %s - zone name (as appears in zone:name).
    zonefile: "zones/%s.zone"

    # Use "%s" to use the name of the zone to track its statistics from
    # nsd-control stats and stats_noreset.
    zonestats: "%s"

    # Notify these slaves when the master zone changes, and allow them
    # to transfer zones.
{% for server in nameservers %}
    notify: {{ server.xfr_ip }} NOKEY  # {{ server.name }}
    provide-xfr: {{ server.xfr_ip }} NOKEY  # {{ server.name }}
{% endfor %}


# Fixed zone entries.  Here you can config zones that cannot be deleted.
# Zones that are dynamically added and deleted are put in the zonelist file.
#
{% for zf in zonefiles %}
zone:
    name: "{{ zf | basename | regex_replace('\.zone\.j2', '') }}"
    include-pattern: "stealth_zones"

{% endfor %}