Add DNS server (#83)

Add DNS server

dhcp_server/Dockerfile

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+FROM %%BASE_IMAGE%%
+
+# Add env
+ENV LANG C.UTF-8
+
+# Setup base
+RUN apk add --no-cache tzdata jq dhcp
+
+# Copy data
+COPY run.sh /
+COPY dhcpd.conf /etc/
+
+RUN chmod a+x /run.sh
+
+CMD [ "/run.sh" ]

dhcp_server/config.json

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+{
+  "name": "DHCP server",
+  "version": "0.1",
+  "slug": "dhcp_server",
+  "description": "A simple dhcp server",
+  "url": "https://home-assistant.io/addons/dhcp_server/",
+  "startup": "before",
+  "boot": "auto",
+  "ports": {
+    "67/tcp": 67,
+    "67/udp": 67
+  },
+  "options": {
+    "domain": null,
+    "domain-name-servers": [null],
+    "networks": [
+      {
+        "subnet": "192.168.1.0",
+        "netmask": "255.255.255.0",
+        "range_start": "192.168.1.100",
+        "range_end": "192.168.1.200",
+        "broadcast": "192.168.1.254",
+        "routers": ["192.168.1.1"]
+      }
+    ],
+    "hosts": [
+      {}
+    ]
+  },
+  "schema": {
+    "domain": null,
+    "dns": ["8.8.8.8", "8.8.4.4"],
+    "networks": [
+      {
+        "subnet": "str",
+        "netmask": "str",
+        "range_start": "str",
+        "range_end": "str",
+        "broadcast": "str",
+        "routers": ["str"]
+      }
+    ],
+    "hosts": [
+      {
+        "mac": "str",
+        "name": "str",
+        "ip": "str"
+      }
+    ]
+  },
+  "image": "homeassistant/{arch}-addon-dhcp_server"
+}

dhcp_server/dhcpd.conf

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+option domain-name "%%DOMAIN%%";
+option domain-name-servers %%DNS_SERVERS%%;
+
+default-lease-time 600;
+max-lease-time 7200;
+
+authoritative;

dhcp_server/run.sh

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+#!/bin/bash
+set -e
+
+CONFIG_PATH=/data/options.json
+
+DOMAIN=$(jq --raw-output '.domain' $CONFIG_PATH)
+DNS=$(jq --raw-output '.dns | join(", ")' $CONFIG_PATH)
+NETWORKS=$(jq --raw-output '.networks | length' $CONFIG_PATH)
+HOSTS=$(jq --raw-output '.hosts | length' $CONFIG_PATH)
+
+sed -i "s/%%DOMAIN%%/$DOMAIN/g" /etc/dhcpd.conf
+sed -i "s/%%DNS_SERVERS%%/$DNS/g" /etc/dhcpd.conf
+
+# Create networks
+for (( i=0; i < "$NETWORKS"; i++ )); do
+    SUBNET=$(jq --raw-output ".networks[$i].subnet" $CONFIG_PATH)
+    NETMASK=$(jq --raw-output ".networks[$i].netmask" $CONFIG_PATH)
+    RANGE_START=$(jq --raw-output ".networks[$i].range_start" $CONFIG_PATH)
+    RANGE_END=$(jq --raw-output ".networks[$i].range_end" $CONFIG_PATH)
+    BROADCAST=$(jq --raw-output ".networks[$i].broadcast" $CONFIG_PATH)
+    ROUTERS=$(jq --raw-output ".networks[$i].routers | joint(\", \")" $CONFIG_PATH)
+
+    {
+        echo "subnet $SUBNET netmask $NETMASK {"
+        echo "  range $RANGE_START $RANGE_END;"
+        echo "  option routers $ROUTERS;"
+        echo "  option broadcast-address $BROADCAST;"
+        echo "}"
+    } >> /etc/dhcpd.conf
+done
+
+# Create hosts
+for (( i=0; i < "$HOSTS"; i++ )); do
+    MAC=$(jq --raw-output ".hosts[$i].mac" $CONFIG_PATH)
+    NAME=$(jq --raw-output ".hosts[$i].name" $CONFIG_PATH)
+    IP=$(jq --raw-output ".hosts[$i].ip" $CONFIG_PATH)
+
+    {
+        echo "host $NAME {"
+        echo "  hardware ethernet $MAC;"
+        echo "  fixed-address $IP;"
+        echo "  option host-name \"$NAME\";"
+        echo "}"
+    } >> /etc/dhcpd.conf
+done
+
+# run dhcp server
+exec /usr/sbin/dhcpd -4 -f -d --no-pid -lf /data/dhcpd.lease -cf /etc/dhcpd.conf < /dev/null