172 lines
6 KiB
Markdown
172 lines
6 KiB
Markdown
# DHCP Lease Manager
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**Zoraxy plugin** — Manage dnsmasq DHCP leases, assign static IPs, and create network-wide hostnames from the Zoraxy web UI.
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---
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## Quick Install
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```bash
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curl -sSL https://git.lohmar.co.uk/cclohmar/zoraxy-dhcp/raw/branch/main/install.sh | sudo bash
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```
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The installer is fully interactive — it asks for your network settings and then installs everything.
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**What it sets up:**
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- dnsmasq DHCP + DNS server with NAT/routing
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- dhcp-lease-manager plugin inside Zoraxy
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- Group-based permissions for secure config access
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- Linux capabilities (`CAP_SYS_ADMIN`) for dnsmasq reloads
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After installation, open Zoraxy → Plugins → enable **DHCP Lease Manager** → access at `/plugin.ui/dhcp-lease-manager/`.
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---
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## Features
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| Feature | Description |
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|---------|-------------|
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| **View leases** | Active DHCP leases with hostname, IP, MAC, expiry |
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| **Pin leases** | Make a lease permanent — sets static DHCP and optional DNS name |
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| **DNS names** | When pinning, give the device a hostname (e.g. `printer.lan`) — resolves network-wide via dnsmasq DNS |
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| **Unpin leases** | Remove static DHCP assignment and DNS record |
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| **Reload** | Apply changes + scrub expired leases from the lease file |
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| **Status badges** | Green "permanent" / grey "active" indicators |
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---
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## DNS Name Service
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When you pin a lease with a hostname, the plugin writes an `address=/name/IP` record to dnsmasq's config. Every DHCP client using this server for DNS can then resolve the name:
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```bash
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# Before pinning
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$ nslookup printer.lan # → NXDOMAIN
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# Click Pin, enter "printer.lan"
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$ nslookup printer.lan 10.1.0.10 # → 10.1.0.50 ✓
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```
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No extra configuration needed — dnsmasq serves the records automatically on reload. Unpinning removes both the static DHCP assignment and the DNS record.
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---
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## Requirements
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| Component | Detail |
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|-----------|--------|
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| **Zoraxy** | v3.2.0+ (plugin system required) |
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| **OS** | Debian, Ubuntu, RHEL, Fedora, Alpine, Arch |
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| **dnsmasq** | Installed by the script |
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| **Go** | Installed by the script (for building the plugin) |
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| **Permissions** | Script must run as root |
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---
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## Architecture
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```
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┌──────────────────────────────────────────────────┐
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│ Zoraxy UI │
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│ /plugin.ui/dhcp-lease-manager/ ─────► iframe │
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└───────────────────────┬──────────────────────────┘
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│ reverse proxy
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┌───────────────────────▼──────────────────────────┐
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│ dhcp-lease-manager │
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│ Go binary • PluginUiRouter • JSON API │
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│ Reads/writes config + triggers dnsmasq reload │
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└──────┬────────────────────────────────┬──────────┘
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│ read/write │ systemctl reload
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┌──────▼──────────────┐ ┌────────────▼──────────┐
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│ /opt/zoraxy/ │ │ dnsmasq │
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│ conf/dhcp/ │ │ DHCP: 10.1.0.100-150 │
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│ dnsmasq.conf ────┼────► DNS: address=/name/ │
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│ dnsmasq.leases │ │ NAT: MASQUERADE │
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└─────────────────────┘ └───────────────────────┘
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▲ │
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│ DNS queries ▼
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│ "printer.lan?" ┌──────────────┐
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└──────────────────────┤ DHCP clients │
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10.1.0.50 └──────────────┘
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```
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All DHCP + DNS configuration lives under `/opt/zoraxy/conf/dhcp/` — a single, unified location regardless of whether Zoraxy runs bare-metal or in Docker.
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---
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## API Endpoints
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| Method | Path | Purpose |
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|--------|------|---------|
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| `GET` | `/ui/api/leases` | List all active + permanent leases |
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| `POST` | `/ui/api/pin` | Pin a lease — set static IP + optional DNS name (body: `mac`, `ip`, `hostname`) |
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| `POST` | `/ui/api/unpin` | Unpin a lease — removes static IP + DNS record (body: `mac`) |
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| `POST` | `/ui/api/reload` | Reload dnsmasq + scrub expired leases (rate-limited: 5s cooldown) |
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---
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## Environment Variables
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Overridable defaults for custom deployments:
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| Variable | Default |
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|----------|---------|
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| `LEASE_FILE` | `/opt/zoraxy/conf/dhcp/dnsmasq.leases` |
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| `CONF_FILE` | `/opt/zoraxy/conf/dhcp/dnsmasq.conf` |
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| `RELOAD_CMD` | `/usr/bin/systemctl` |
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| `RELOAD_ARGS` | `reload dnsmasq` |
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---
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## Permissions
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The installer creates a `dnsmasq-edit` group for config file access and adds `CAP_SYS_ADMIN` to the Zoraxy systemd service so the plugin can reload dnsmasq without sudo:
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```
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Group: dnsmasq-edit
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→ zoraxy user added
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→ Read/write on /opt/zoraxy/conf/dhcp/
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Zoraxy systemd service:
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→ CapabilityBoundingSet=CAP_SYS_ADMIN
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→ AmbientCapabilities=CAP_SYS_ADMIN
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```
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---
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## Uninstall
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```bash
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sudo bash install.sh --remove
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```
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Removes dnsmasq, the plugin, config files, group, and NAT rules — leaving the system clean.
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---
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## Manual Install
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```bash
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# 1. Clone the repo
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git clone https://git.lohmar.co.uk/cclohmar/zoraxy-dhcp.git /opt/zoraxy/plugins/dhcp-lease-manager
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# 2. Build
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cd /opt/zoraxy/plugins/dhcp-lease-manager
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go build -buildvcs=false -o dhcp-lease-manager .
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# 3. Run setup (as root)
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sudo bash install.sh
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```
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---
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## License
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Zoraxy plugin SDK is LGPL. This plugin is open source.
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---
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## Credits
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- [Zoraxy](https://github.com/tobychui/zoraxy) — Reverse proxy and plugin system
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- [dnsmasq](https://thekelleys.org.uk/dnsmasq/doc.html) — DNS/DHCP server
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