48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
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#!/data/data/com.termux/files/usr/bin/bash
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# resolve: hostname -> IP con fallback mDNS (LAN) -> Tailscale DNS -> cache
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# Uso: resolve <hostname>[.local|.tailnet]
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# Ej: resolve lenovo # -> 100.69.236.16
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# ping $(resolve hp62a)
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# curl "http://$(resolve dell):8080"
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set -e
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HOST="${1:-}"
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[[ -z "$HOST" ]] && { echo "Uso: resolve <hostname>" >&2; exit 1; }
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CACHE="$HOME/.ssh/resolve-cache"
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TAILSCALE_DOMAIN="${TAILSCALE_DOMAIN:-tailb0bb74.ts.net}"
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MDNS_TIMEOUT="${MDNS_TIMEOUT:-1}"
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QUERY="${HOST%.local}"
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QUERY="${QUERY%.${TAILSCALE_DOMAIN}}"
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declare -A ALIASES=(
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[dell]="dell-latitude3400"
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[lenovo]="lenovo-ideapad"
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)
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[[ -n "${ALIASES[$QUERY]:-}" ]] && QUERY="${ALIASES[$QUERY]}"
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# 1. mDNS multicast (LAN)
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IP=$("$HOME/.local/bin/mdns-resolve" "${QUERY}.local" "$MDNS_TIMEOUT" 2>/dev/null || true)
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# 2. Tailscale MagicDNS (remoto)
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if [[ -z "$IP" ]]; then
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IP=$(python -c "import socket; print(socket.gethostbyname('${QUERY}.${TAILSCALE_DOMAIN}'))" 2>/dev/null || true)
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fi
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# 3. Cache
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if [[ -z "$IP" && -f "$CACHE" ]]; then
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IP=$(grep "^${QUERY} " "$CACHE" 2>/dev/null | awk '{print $2}')
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fi
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if [[ -z "$IP" ]]; then
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echo "Error: no se resuelve '${HOST}'" >&2
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exit 1
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fi
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mkdir -p "$(dirname "$CACHE")"
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grep -v "^${QUERY} " "$CACHE" > "${CACHE}.tmp" 2>/dev/null || true
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echo "${QUERY} ${IP}" >> "${CACHE}.tmp"
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mv "${CACHE}.tmp" "$CACHE"
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echo "$IP"
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