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Add error handling for WiFi and Bluetooth scanning

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- Add stderr capture and display for airodump-ng errors in WiFi scanning
- Add early failure detection with helpful error messages for WiFi scan
- Add timeout warning when no scan data received after 5 seconds
- Add error handling for Bluetooth scanning with stderr capture
- Add showError() function to display errors in red in the output panel
- Add error type handlers to WiFi and Bluetooth SSE event streams
- Hide RTL-SDR device section when in WiFi or Bluetooth modes
- Improve error messages with install instructions for missing tools

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
James Smith
2025-12-20 12:24:13 +00:00
parent 2f9bc3a26e
commit e5eb95231c
1 changed files with 147 additions and 7 deletions
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154
intercept.py
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@@ -1389,8 +1389,8 @@ HTML_TEMPLATE = '''
<button class="mode-tab" onclick="switchMode('bluetooth')">BT</button>
</div>
<div class="section">
<h3>Device</h3>
<div class="section" id="rtlDeviceSection">
<h3>RTL-SDR Device</h3>
<div class="form-group">
<select id="deviceSelect">
{% if devices %}
@@ -1933,6 +1933,9 @@ HTML_TEMPLATE = '''
document.getElementById('wifiVisuals').style.display = mode === 'wifi' ? 'grid' : 'none';
document.getElementById('btVisuals').style.display = mode === 'bluetooth' ? 'grid' : 'none';
// Show RTL-SDR device section only for modes that use it (pager and sensor/433MHz)
document.getElementById('rtlDeviceSection').style.display = (mode === 'pager' || mode === 'sensor') ? 'block' : 'none';
// Load interfaces when switching modes
if (mode === 'wifi') {
refreshWifiInterfaces();
@@ -2624,6 +2627,22 @@ HTML_TEMPLATE = '''
output.insertBefore(infoEl, output.firstChild);
}
function showError(text) {
const output = document.getElementById('output');
// Clear placeholder only (has the 'placeholder' class)
const placeholder = output.querySelector('.placeholder');
if (placeholder) {
placeholder.remove();
}
const errorEl = document.createElement('div');
errorEl.className = 'error-msg';
errorEl.style.cssText = 'padding: 12px 15px; margin-bottom: 8px; background: #1a0a0a; border: 1px solid #2a1a1a; border-left: 2px solid #ff3366; font-family: "JetBrains Mono", monospace; font-size: 11px; color: #ff6688; word-break: break-all;';
errorEl.textContent = '⚠ ' + text;
output.insertBefore(errorEl, output.firstChild);
}
function clearMessages() {
document.getElementById('output').innerHTML = `
<div class="placeholder" style="color: #888; text-align: center; padding: 50px;">
@@ -3137,6 +3156,8 @@ HTML_TEMPLATE = '''
handleWifiClient(data);
} else if (data.type === 'info' || data.type === 'raw') {
showInfo(data.text);
} else if (data.type === 'error') {
showError(data.text);
} else if (data.type === 'status') {
if (data.text === 'stopped') {
setWifiRunning(false);
@@ -3740,6 +3761,8 @@ HTML_TEMPLATE = '''
handleBtDevice(data);
} else if (data.type === 'info' || data.type === 'raw') {
showInfo(data.text);
} else if (data.type === 'error') {
showError(data.text);
} else if (data.type === 'status') {
if (data.text === 'stopped') {
setBtRunning(false);
@@ -4859,7 +4882,7 @@ def toggle_monitor_mode():
except Exception as e:
return jsonify({'status': 'error', 'message': str(e)})
else:
return jsonify({'status': 'error', 'message': 'No monitor mode tools available (need airmon-ng or iw)'})
return jsonify({'status': 'error', 'message': 'No monitor mode tools available. Install aircrack-ng (brew install aircrack-ng) or iw.'})
else: # stop
if check_tool('airmon-ng'):
@@ -4951,17 +4974,42 @@ def stream_airodump_output(process, csv_path):
"""Stream airodump-ng output to queue."""
global wifi_process, wifi_networks, wifi_clients
import time
import select
try:
wifi_queue.put({'type': 'status', 'text': 'started'})
last_parse = 0
start_time = time.time()
csv_found = False
while process.poll() is None:
# Check for stderr output (non-blocking)
try:
import fcntl
# Make stderr non-blocking
fd = process.stderr.fileno()
fl = fcntl.fcntl(fd, fcntl.F_GETFL)
fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_NONBLOCK)
stderr_data = process.stderr.read()
if stderr_data:
stderr_text = stderr_data.decode('utf-8', errors='replace').strip()
if stderr_text:
# Filter out progress updates, report actual errors
for line in stderr_text.split('\n'):
line = line.strip()
if line and not line.startswith('CH') and not line.startswith('Elapsed'):
wifi_queue.put({'type': 'error', 'text': f'airodump-ng: {line}'})
except Exception:
pass
# Parse CSV file periodically
current_time = time.time()
if current_time - last_parse >= 2: # Parse every 2 seconds
if os.path.exists(csv_path + '-01.csv'):
networks, clients = parse_airodump_csv(csv_path + '-01.csv')
csv_file = csv_path + '-01.csv'
if os.path.exists(csv_file):
csv_found = True
networks, clients = parse_airodump_csv(csv_file)
# Detect new networks
for bssid, net in networks.items():
@@ -4991,9 +5039,28 @@ def stream_airodump_output(process, csv_path):
wifi_networks = networks
wifi_clients = clients
last_parse = current_time
elif current_time - start_time > 5 and not csv_found:
# No CSV after 5 seconds - likely a problem
wifi_queue.put({'type': 'error', 'text': 'No scan data after 5 seconds. Check if monitor mode is properly enabled.'})
start_time = current_time + 30 # Don't spam this message
time.sleep(0.5)
# Process exited - capture any remaining stderr
try:
remaining_stderr = process.stderr.read()
if remaining_stderr:
stderr_text = remaining_stderr.decode('utf-8', errors='replace').strip()
if stderr_text:
wifi_queue.put({'type': 'error', 'text': f'airodump-ng exited: {stderr_text}'})
except Exception:
pass
# Check exit code
exit_code = process.returncode
if exit_code != 0 and exit_code is not None:
wifi_queue.put({'type': 'error', 'text': f'airodump-ng exited with code {exit_code}'})
except Exception as e:
wifi_queue.put({'type': 'error', 'text': str(e)})
finally:
@@ -5062,6 +5129,29 @@ def start_wifi_scan():
stderr=subprocess.PIPE
)
# Wait briefly to check if process fails immediately
import time
time.sleep(0.5)
if wifi_process.poll() is not None:
# Process already exited - capture error
stderr_output = wifi_process.stderr.read().decode('utf-8', errors='replace').strip()
stdout_output = wifi_process.stdout.read().decode('utf-8', errors='replace').strip()
exit_code = wifi_process.returncode
wifi_process = None
error_msg = stderr_output or stdout_output or f'Process exited with code {exit_code}'
# Common error explanations
if 'No such device' in error_msg or 'No such interface' in error_msg:
error_msg = f'Interface "{interface}" not found. Make sure monitor mode is enabled.'
elif 'Operation not permitted' in error_msg:
error_msg = 'Permission denied. Try running with sudo.'
elif 'monitor mode' in error_msg.lower():
error_msg = f'Interface "{interface}" is not in monitor mode. Enable monitor mode first.'
return jsonify({'status': 'error', 'message': error_msg})
# Start parsing thread
thread = threading.Thread(target=stream_airodump_output, args=(wifi_process, csv_path))
thread.daemon = True
@@ -5072,7 +5162,7 @@ def start_wifi_scan():
return jsonify({'status': 'started', 'interface': interface})
except FileNotFoundError:
return jsonify({'status': 'error', 'message': 'airodump-ng not found. Install aircrack-ng suite.'})
return jsonify({'status': 'error', 'message': 'airodump-ng not found. Install aircrack-ng suite (brew install aircrack-ng).'})
except Exception as e:
return jsonify({'status': 'error', 'message': str(e)})
@@ -5444,6 +5534,17 @@ def stream_bt_scan(process, scan_mode):
try:
bt_queue.put({'type': 'status', 'text': 'started'})
start_time = time.time()
device_found = False
# Set up non-blocking stderr reading
try:
import fcntl
fd = process.stderr.fileno()
fl = fcntl.fcntl(fd, fcntl.F_GETFL)
fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_NONBLOCK)
except Exception:
pass
if scan_mode == 'hcitool':
# hcitool lescan output
@@ -5519,7 +5620,22 @@ def stream_bt_scan(process, scan_mode):
except Exception as e:
bt_queue.put({'type': 'error', 'text': str(e)})
finally:
# Capture any remaining stderr
try:
remaining_stderr = process.stderr.read()
if remaining_stderr:
stderr_text = remaining_stderr.decode('utf-8', errors='replace').strip()
if stderr_text:
bt_queue.put({'type': 'error', 'text': f'Bluetooth scan: {stderr_text}'})
except Exception:
pass
# Check exit code
process.wait()
exit_code = process.returncode
if exit_code != 0 and exit_code is not None:
bt_queue.put({'type': 'error', 'text': f'Bluetooth scan exited with code {exit_code}'})
bt_queue.put({'type': 'status', 'text': 'stopped'})
with bt_lock:
bt_process = None
@@ -5596,6 +5712,29 @@ def start_bt_scan():
else:
return jsonify({'status': 'error', 'message': f'Unknown scan mode: {scan_mode}'})
# Wait briefly to check if process fails immediately
import time
time.sleep(0.5)
if bt_process.poll() is not None:
# Process already exited - capture error
stderr_output = bt_process.stderr.read().decode('utf-8', errors='replace').strip()
stdout_output = bt_process.stdout.read().decode('utf-8', errors='replace').strip()
exit_code = bt_process.returncode
bt_process = None
error_msg = stderr_output or stdout_output or f'Process exited with code {exit_code}'
# Common error explanations
if 'No such device' in error_msg or 'hci0' in error_msg.lower():
error_msg = f'Bluetooth interface "{interface}" not found or not available.'
elif 'Operation not permitted' in error_msg or 'Permission denied' in error_msg:
error_msg = 'Permission denied. Try running with sudo or add user to bluetooth group.'
elif 'busy' in error_msg.lower():
error_msg = f'Bluetooth interface "{interface}" is busy. Stop other Bluetooth operations first.'
return jsonify({'status': 'error', 'message': error_msg})
# Start streaming thread
thread = threading.Thread(target=stream_bt_scan, args=(bt_process, scan_mode))
thread.daemon = True
@@ -5605,7 +5744,8 @@ def start_bt_scan():
return jsonify({'status': 'started', 'mode': scan_mode, 'interface': interface})
except FileNotFoundError as e:
return jsonify({'status': 'error', 'message': f'Tool not found: {e.filename}'})
tool_name = e.filename or scan_mode
return jsonify({'status': 'error', 'message': f'Tool "{tool_name}" not found. Install required Bluetooth tools.'})
except Exception as e:
return jsonify({'status': 'error', 'message': str(e)})