#!/bin/bash
set -euo pipefail
OUT="${1:-$HOME/Desktop/AI_Brain/logs/network_capture.pcap}"
IFACE="${2:-en0}"
DUR="${3:-30}"
echo "📦 Capturing $DUR s of packets on $IFACE to $OUT (sudo required)..."
sudo tcpdump -i "$IFACE" -s 0 -G "$DUR" -W 1 -w "$OUT"
echo "✅ Capture saved to $OUT"