From 2265dd235bf7ad5cc9937a7046a790b0d82d8f51 Mon Sep 17 00:00:00 2001
From: "Dustin C. Hatch" <dustin@hatch.name>
Date: Fri, 22 Mar 2019 09:42:42 -0500
Subject: [PATCH] roles/hass-dhcp: Deploy DHCP server for HA

The *hass-dhcp* role installs dnsmasq and configures it to serve DHCP
requests on the Home Assistant network. Since this network is not
routed, the regular DHCP relay/server setup will not work.
---
 homeassistant.yml                                  |  9 +++++++++
 roles/hass-dhcp/defaults/main.yml                  |  5 +++++
 roles/hass-dhcp/handlers/main.yml                  |  4 ++++
 roles/hass-dhcp/tasks/main.yml                     | 14 ++++++++++++++
 .../templates/homeassistant.dnsmasq.conf.j2        |  3 +++
 5 files changed, 35 insertions(+)
 create mode 100644 roles/hass-dhcp/defaults/main.yml
 create mode 100644 roles/hass-dhcp/handlers/main.yml
 create mode 100644 roles/hass-dhcp/tasks/main.yml
 create mode 100644 roles/hass-dhcp/templates/homeassistant.dnsmasq.conf.j2

diff --git a/homeassistant.yml b/homeassistant.yml
index 40d5f5f..1d46ed0 100644
--- a/homeassistant.yml
+++ b/homeassistant.yml
@@ -11,3 +11,12 @@
     service:
       name: httpd
       state: started
+
+- hosts: home-assistant
+  roles:
+  - hass-dhcp
+  tasks:
+  - name: ensure dnsmasq is running
+    service:
+      name: dnsmasq
+      state: started
diff --git a/roles/hass-dhcp/defaults/main.yml b/roles/hass-dhcp/defaults/main.yml
new file mode 100644
index 0000000..3f30a2e
--- /dev/null
+++ b/roles/hass-dhcp/defaults/main.yml
@@ -0,0 +1,5 @@
+hass_dhcp_range:
+  start: 192.168.1.100
+  end: 192.168.1.250
+hass_dhcp_lease_time: 1h
+hass_dns_domain: homeassistant.io
diff --git a/roles/hass-dhcp/handlers/main.yml b/roles/hass-dhcp/handlers/main.yml
new file mode 100644
index 0000000..bf3bfdc
--- /dev/null
+++ b/roles/hass-dhcp/handlers/main.yml
@@ -0,0 +1,4 @@
+- name: restart dnsmasq
+  service:
+    name: dnsmasq
+    state: restarted
diff --git a/roles/hass-dhcp/tasks/main.yml b/roles/hass-dhcp/tasks/main.yml
new file mode 100644
index 0000000..8a0a651
--- /dev/null
+++ b/roles/hass-dhcp/tasks/main.yml
@@ -0,0 +1,14 @@
+- name: ensure dnsmasq is installed
+  package:
+    name: dnsmasq
+    state: present
+  tags:
+  - install
+
+- name: ensure dnsmasq is configured for homeassistant
+  template:
+    src: homeassistant.dnsmasq.conf.j2
+    dest: /etc/dnsmasq.d/homeassistant.conf
+    mode: '0644'
+  notify:
+  - restart dnsmasq
diff --git a/roles/hass-dhcp/templates/homeassistant.dnsmasq.conf.j2 b/roles/hass-dhcp/templates/homeassistant.dnsmasq.conf.j2
new file mode 100644
index 0000000..8b54181
--- /dev/null
+++ b/roles/hass-dhcp/templates/homeassistant.dnsmasq.conf.j2
@@ -0,0 +1,3 @@
+interface={{ hass_interface }}
+dhcp-range={{ hass_dhcp_range.start }},{{ hass_dhcp_range.end }},{{ hass_dhcp_lease_time }}
+domain={{ hass_dns_domain }}