Oier Bravo Urtasun
c279f35e14
dns-records.sh <mode> hosts prints a marker-wrapped /etc/hosts block to pipe into /etc/hosts (single-machine testing without a DNS server). README documents apply/remove + the airgap caveat (spoof hosts break real internet while present). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
85 lines
2.7 KiB
Bash
Executable File
85 lines
2.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# dns-records.sh — print the DNS records to configure on YOUR party DNS server.
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#
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# Usage: tooling/dns-records.sh [online|airgap] (default: airgap)
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# online service names only — your DNS forwards everything else to the internet
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# airgap service names + the spoofed upstream hosts (Mojang/launcher/NeoForge),
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# so guest laptops fetch game files from the LAN mirror with no internet
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#
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# All names point to HOST_LAN_IP. Reads BASE_DOMAIN / HOST_LAN_IP from .env.
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# Prints several formats; use whichever your DNS UI wants.
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set -euo pipefail
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cd "$(dirname "$0")/.."
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[ -f .env ] && { set -a; . ./.env; set +a; }
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: "${BASE_DOMAIN:?BASE_DOMAIN unset (set in .env)}"
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: "${HOST_LAN_IP:?HOST_LAN_IP unset (set in .env)}"
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mode="${1:-airgap}"
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# Stack service names (always).
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services=(
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"${BASE_DOMAIN}"
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"auth.${BASE_DOMAIN}"
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"packwiz.${BASE_DOMAIN}"
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"mc.${BASE_DOMAIN}"
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)
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# Upstream hosts spoofed onto the LAN mirror (AIRGAP only). Keep in sync with
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# caddy/conf.d/20-mirror.caddy and docker-compose.mirror.yml.
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spoof=(
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"meta.prismlauncher.org"
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"piston-meta.mojang.com"
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"piston-data.mojang.com"
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"libraries.minecraft.net"
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"maven.neoforged.net"
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"resources.download.minecraft.net"
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)
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names=("${services[@]}")
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case "$mode" in
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online) ;;
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airgap) names+=("${spoof[@]}") ;;
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*) echo "usage: $0 [online|airgap] [hosts]" >&2; exit 1 ;;
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esac
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# Marker so /etc/hosts edits can be applied/removed cleanly.
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MARK="ulicraft ${mode}"
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# `hosts` format: print ONLY the /etc/hosts block (marker-wrapped) so it can be
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# piped straight into /etc/hosts to simulate the party DNS. See README.
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if [ "${2:-}" = hosts ]; then
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echo "# >>> ${MARK} >>>"
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for n in "${names[@]}"; do printf '%s %s\n' "$HOST_LAN_IP" "$n"; done
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echo "# <<< ${MARK} <<<"
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exit 0
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fi
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echo "# DNS records for mode=${mode} -> ${HOST_LAN_IP}"
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echo "# Configure these on your party DNS server (all A records to the host)."
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echo
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echo "## Plain (name -> ip)"
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for n in "${names[@]}"; do printf '%-36s %s\n' "$n" "$HOST_LAN_IP"; done
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echo
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echo "## hosts file (/etc/hosts style)"
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for n in "${names[@]}"; do printf '%s %s\n' "$HOST_LAN_IP" "$n"; done
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echo
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echo "## BIND zone (A records)"
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for n in "${names[@]}"; do printf '%-36s IN A %s\n' "${n}." "$HOST_LAN_IP"; done
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echo
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echo "## dnsmasq (address=)"
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echo "address=/${BASE_DOMAIN}/${HOST_LAN_IP} # wildcard covers all *.${BASE_DOMAIN}"
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if [ "$mode" = airgap ]; then
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for n in "${spoof[@]}"; do printf 'address=/%s/%s\n' "$n" "$HOST_LAN_IP"; done
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fi
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echo
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echo "## Minecraft (no port needed)"
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echo "# Clients connect to mc.${BASE_DOMAIN} (defaults to :25565)."
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echo "# Optional SRV if your DNS supports it:"
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echo "_minecraft._tcp.mc.${BASE_DOMAIN}. IN SRV 0 0 25565 mc.${BASE_DOMAIN}."
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