49 lines
1.2 KiB
Bash
Executable File
49 lines
1.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# ssh-mdns-proxy: Resolve .local via mDNS with fallbacks, then connect
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#
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# Resolution order: mDNS → Tailscale DNS → cached IP
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# Usage: ssh-mdns-proxy <hostname> [port]
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#
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# Configure your Tailscale domain:
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TAILSCALE_DOMAIN="${TAILSCALE_DOMAIN:-tailb0bb74.ts.net}"
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HOST="$1"
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PORT="${2:-22}"
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CACHE="$HOME/.ssh/mdns-cache"
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QUERY="${HOST%.local}"
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# Alias mapping (short name -> mDNS hostname)
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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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SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
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# 1. mDNS resolution
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IP=$("$SCRIPT_DIR/mdns-resolve" "${QUERY}.local" 2 2>/dev/null)
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# 2. Fallback: Tailscale DNS
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if [[ -z "$IP" ]]; then
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IP=$(getent hosts "${QUERY}.${TAILSCALE_DOMAIN}" 2>/dev/null | awk '{print $1}')
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fi
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# 3. Fallback: cached IP
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if [[ -z "$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: cannot resolve ${HOST}" >&2
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exit 1
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fi
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# Save to cache
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mkdir -p "$(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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exec nc "$IP" "$PORT"
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