hobokenchicken
00a95fda80
Registers {hostname}.home.dustin.coffee → host IP on boot via AdGuard Home API.
Deploy to any LXC/VM with ./install.sh — supports root (system service),
sudo user (system via sudo), and unprivileged user (systemd --user or crontab).
Files:
- adguard-register.sh — detects hostname+IP, idempotent create/update
- install.sh — deployment script with auto-detection of install method
- uninstall.sh — removes service and binary
- README.md — full documentation
Tested across 24 hosts (LXCs and VMs) on a 172.20.0.0/16 home lab network.
89 lines
2.7 KiB
Bash
Executable File
89 lines
2.7 KiB
Bash
Executable File
#!/bin/bash
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# adguard-register — registers this host with AdGuard Home DNS rewrites
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# Deploy to each LXC/VM, run at boot via systemd oneshot or @reboot cron
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set -euo pipefail
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ADGUARD_URL="http://172.20.1.1"
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USERNAME="newkirk"
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PASSWORD="Vaxjy911!"
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# Get short hostname (portable: try hostname -s, fall back to /etc/hostname or /proc)
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if command -v hostname &>/dev/null; then
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HOSTNAME=$(hostname -s)
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elif [ -f /etc/hostname ]; then
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HOSTNAME=$(cat /etc/hostname | cut -d. -f1)
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else
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HOSTNAME=$(cat /proc/sys/kernel/hostname 2>/dev/null | cut -d. -f1)
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fi
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# Get primary IPv4 (non-loopback, non-docker, non-tailscale)
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IP=$(ip -4 addr show scope global | grep -v 'docker\|tailscale\|br-\|veth' | grep -oP 'inet \K[\d.]+' | head -1)
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if [ -z "$IP" ]; then
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echo "ERROR: Could not determine primary IPv4 address"
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exit 1
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fi
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DOMAIN="${HOSTNAME}.home.dustin.coffee"
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# Login
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COOKIE=$(curl -s -D - "${ADGUARD_URL}/control/login" \
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-H "Content-Type: application/json" \
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-d "{\"name\":\"${USERNAME}\",\"password\":\"${PASSWORD}\"}" \
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| grep -i 'set-cookie' | grep -oP 'agh_session=[a-f0-9]+' | head -1)
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if [ -z "$COOKIE" ]; then
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echo "ERROR: Failed to authenticate with AdGuard Home"
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exit 1
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fi
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# Check if rewrite already exists
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EXISTING=$(curl -s "${ADGUARD_URL}/control/rewrite/list" -b "$COOKIE")
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EXISTING_ANSWER=$(echo "$EXISTING" | python3 -c "
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import sys,json
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data=json.load(sys.stdin)
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for r in data:
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if r.get('domain') == '$DOMAIN':
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print(r.get('answer',''))
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break
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" 2>/dev/null)
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if [ -n "$EXISTING_ANSWER" ]; then
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if [ "$EXISTING_ANSWER" = "$IP" ]; then
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echo "OK: $DOMAIN already points to $IP — nothing to do"
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exit 0
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fi
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# Update existing
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echo "Updating $DOMAIN: $EXISTING_ANSWER → $IP"
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curl -s -X POST "${ADGUARD_URL}/control/rewrite/update" \
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-b "$COOKIE" \
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-H "Content-Type: application/json" \
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-d "{\"target\":{\"domain\":\"$DOMAIN\"},\"update\":{\"domain\":\"$DOMAIN\",\"answer\":\"$IP\"}}" \
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> /dev/null
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else
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# Create new
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echo "Registering $DOMAIN → $IP"
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curl -s -X POST "${ADGUARD_URL}/control/rewrite/add" \
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-b "$COOKIE" \
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-H "Content-Type: application/json" \
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-d "{\"domain\":\"$DOMAIN\",\"answer\":\"$IP\"}" \
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> /dev/null
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fi
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# Verify
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VERIFY=$(curl -s "${ADGUARD_URL}/control/rewrite/list" -b "$COOKIE" | python3 -c "
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import sys,json
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data=json.load(sys.stdin)
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for r in data:
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if r.get('domain') == '$DOMAIN':
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print(r.get('answer',''))
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" 2>/dev/null)
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if [ "$VERIFY" = "$IP" ]; then
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echo "SUCCESS: $DOMAIN → $IP verified"
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exit 0
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else
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echo "WARN: Verification failed — $DOMAIN resolves to '$VERIFY', expected '$IP'"
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exit 1
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fi
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