locals {
  #The below locals convert an IP address range into separate elements.  Take 10.0.2.0/24 for example:
  first_octet = var.create_reverse_dns_zone == true && var.address_range != null ? element(split(".", element(var.address_range, 0)), 0) : null
  # Gets the first octet of range, so for example, 10
  second_octet = var.create_reverse_dns_zone == true && var.address_range != null ? element(split(".", element(var.address_range, 0)), 1) : null
  # Gets the second octet of range, so for example, 0
  third_octet = var.create_reverse_dns_zone == true && var.address_range != null ? element(split(".", element(var.address_range, 0)), 2) : null
  # Gets the third octet of range, so for example, 2
  fourth_element = var.create_reverse_dns_zone == true && var.address_range != null ? element(split(".", element(var.address_range, 0)), 3) : null
  # Gets the forth element of range, so for example, 0/24
  fourth_octet = var.create_reverse_dns_zone == true && var.address_range != null && local.fourth_element != null ? element(split("/", local.fourth_element), 0) : null
  # Gets the fourth element of range, so for example, 0
  cidr_range = var.create_reverse_dns_zone == true && var.address_range != null && local.fourth_element != null ? element(split("/", local.fourth_element), 1) : null
  # Gets the the cidr portion of the range, so for example, 24

  # Reconstructs the name using above elements to create, for example, 24-0.2.0.10.in-addr.arpa
  reverse_zone_name = var.create_reverse_dns_zone == true && var.address_range != null ? format("%d-%d.%d.%d.%d.in-addr.arpa", local.cidr_range, local.fourth_octet, local.third_octet, local.second_octet, local.first_octet) : null
}

resource "azurerm_private_dns_zone" "reverse_dns_zone" {
  for_each = var.create_reverse_dns_zone == true && var.address_range != null ? toset(var.address_range) : []

  name                = local.reverse_zone_name
  resource_group_name = var.rg_name
  tags                = var.tags
}

resource "azurerm_private_dns_zone_virtual_network_link" "reverse_dns_zone_link" {
  for_each              = try(var.link_to_vnet, true) == true && var.create_reverse_dns_zone == true && var.address_range != null ? toset(var.address_range) : []
  name                  = var.vnet_link_name == null ? "${lower(replace(azurerm_private_dns_zone.reverse_dns_zone[each.key].name, ".", "-"))}-link-to-${local.vnet_name}" : try(var.vnet_link_name, null)
  resource_group_name   = try(var.rg_name, null)
  private_dns_zone_name = azurerm_private_dns_zone.reverse_dns_zone[each.key].name
  virtual_network_id    = try(var.vnet_id, null)
  tags                  = try(var.tags, null)
}

resource "azurerm_private_dns_zone_virtual_network_link" "reverse_dns_zone_link_hub" {
  for_each              = try(var.link_to_vnet, true) == true && var.create_reverse_dns_zone == true && var.attempt_reverse_dns_dns_zone_link_to_hub == true && var.address_range != null ? toset(var.address_range) : []
  name                  = var.vnet_link_name == null ? "${lower(replace(azurerm_private_dns_zone.reverse_dns_zone[each.key].name, ".", "-"))}-link-to-${local.hub_vnet_name}" : try(var.vnet_link_name, null)
  resource_group_name   = try(var.rg_name, null)
  private_dns_zone_name = azurerm_private_dns_zone.reverse_dns_zone[each.key].name
  virtual_network_id    = try(var.hub_vnet_id, null)
  tags                  = try(var.tags, null)
}

Requirements

No requirements.

Providers

Name	Version
azurerm	n/a

Modules

No modules.

Resources

Name	Type
azurerm_private_dns_zone.reverse_dns_zone	resource
azurerm_private_dns_zone_virtual_network_link.reverse_dns_zone_link	resource
azurerm_private_dns_zone_virtual_network_link.reverse_dns_zone_link_hub	resource

Inputs

Name	Description	Type	Default	Required
address_range	If creating a reverse DNS zone, provide this input with a full cidr range, e.g. 10.0.0.0/16, as it will be split and made if the create_reverse_dns_zone variable is set to true	list(string)	null	no
attempt_reverse_dns_dns_zone_link_to_hub	Whether the DNS zone being made should be linked to the hub	bool	false	no
create_reverse_dns_zone	Whether or not to create a reverse DNS zone, defaults to false	bool	false	no
hub_vnet_id	The ID of the hub vnet	string	null	no
link_to_vnet	Whether or not the zone should be linked to the vnet, defaults to false	bool	false	no
location	The location for this resource to be put in	string	n/a	yes
rg_name	The name of the resource group, this module does not create a resource group, it is expecting the value of a resource group already exists	string	n/a	yes
tags	A map of the tags to use on the resources that are deployed with this module.	map(string)	n/a	yes
vnet_id	The vnet id the dns zones should be linked to	string	null	no
vnet_link_name	The name of the vnet link if one is made, defaults to null	string	null	no

Outputs

Name	Description
dns_number_of_record_sets	The max number of virtual network links with registration
dns_zone_id	The dns zone ids
dns_zone_max_number_of_record_sets	The max number of record sets
dns_zone_max_number_of_virtual_network_links	The dns max number of virtual network links
dns_zone_max_number_of_virtual_network_links_with_registration	The max number of virtual network links with registration
dns_zone_name	The dns zone name
vnet_link_id	The vnet link ids