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https://github.com/smittix/intercept.git
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Robust monitor mode interface detection
- Get list of interfaces before/after enabling monitor mode - Detect new interface by comparing before/after sets - Multiple fallback methods: new interface detection, regex patterns, iwconfig check - Verify interface exists before using it - Add detailed debug logging for troubleshooting 🤖 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
+128
-17
@@ -4860,6 +4860,48 @@ def toggle_monitor_mode():
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# Try airmon-ng first
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if check_tool('airmon-ng'):
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try:
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import re
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# Get list of wireless interfaces BEFORE enabling monitor mode
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def get_wireless_interfaces():
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"""Get all wireless interface names."""
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interfaces = set()
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try:
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# Try iwconfig first (shows wireless interfaces)
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result = subprocess.run(['iwconfig'], capture_output=True, text=True, timeout=5)
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for line in result.stdout.split('\n'):
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if line and not line.startswith(' ') and 'no wireless' not in line.lower():
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iface = line.split()[0] if line.split() else None
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if iface:
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interfaces.add(iface)
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except:
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pass
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try:
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# Also check /sys/class/net for interfaces with wireless dir
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import os
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for iface in os.listdir('/sys/class/net'):
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if os.path.exists(f'/sys/class/net/{iface}/wireless'):
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interfaces.add(iface)
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except:
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pass
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try:
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# Also try ip link to find any interface
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result = subprocess.run(['ip', 'link', 'show'], capture_output=True, text=True, timeout=5)
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for match in re.finditer(r'^\d+:\s+(\S+):', result.stdout, re.MULTILINE):
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iface = match.group(1).rstrip(':')
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# Include interfaces that look like wireless (wl*, wlan*, etc)
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if iface.startswith('wl') or 'mon' in iface:
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interfaces.add(iface)
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except:
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pass
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return interfaces
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interfaces_before = get_wireless_interfaces()
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print(f"[WiFi] Interfaces before monitor mode: {interfaces_before}", flush=True)
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# Kill interfering processes
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subprocess.run(['airmon-ng', 'check', 'kill'], capture_output=True, timeout=10)
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@@ -4867,29 +4909,98 @@ def toggle_monitor_mode():
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result = subprocess.run(['airmon-ng', 'start', interface],
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capture_output=True, text=True, timeout=15)
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# Parse output to find monitor interface name
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output = result.stdout + result.stderr
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# Common patterns: wlan0mon, wlp3s0mon, etc.
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import re
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# Look for "on <interface>mon" pattern first (most reliable)
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match = re.search(r'\bon\s+(\w+mon)\b', output, re.IGNORECASE)
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if not match:
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# Fallback: look for interface pattern like wlan0mon, wlp3s0mon (must have a digit)
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match = re.search(r'\b(\w*\d+\w*mon)\b', output)
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if not match:
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# Second fallback: look for the original interface + mon in output
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iface_pattern = re.escape(interface) + r'mon'
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match = re.search(r'\b(' + iface_pattern + r')\b', output)
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if match:
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wifi_monitor_interface = match.group(1)
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else:
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# Assume it's interface + 'mon'
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wifi_monitor_interface = interface + 'mon'
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print(f"[WiFi] airmon-ng output:\n{output}", flush=True)
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# Get interfaces AFTER enabling monitor mode
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import time
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time.sleep(1) # Give system time to register new interface
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interfaces_after = get_wireless_interfaces()
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print(f"[WiFi] Interfaces after monitor mode: {interfaces_after}", flush=True)
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# Find the new interface (the monitor mode one)
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new_interfaces = interfaces_after - interfaces_before
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print(f"[WiFi] New interfaces detected: {new_interfaces}", flush=True)
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# Determine monitor interface
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monitor_iface = None
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# Method 1: New interface appeared
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if new_interfaces:
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# Prefer interface with 'mon' in name
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for iface in new_interfaces:
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if 'mon' in iface:
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monitor_iface = iface
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break
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if not monitor_iface:
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monitor_iface = list(new_interfaces)[0]
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# Method 2: Parse airmon-ng output
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if not monitor_iface:
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# Look for various patterns in airmon-ng output
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patterns = [
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r'monitor mode.*enabled.*on\s+(\S+)', # "monitor mode enabled on wlan0mon"
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r'\(monitor mode.*enabled.*?(\S+mon)\)', # "(monitor mode enabled on wlan0mon)"
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r'created\s+(\S+mon)', # "created wlan0mon"
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r'\bon\s+(\S+mon)\b', # "on wlan0mon"
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r'\b(\S+mon)\b.*monitor', # "wlan0mon in monitor"
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r'\b(' + re.escape(interface) + r'mon)\b', # exact match: interfacemon
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]
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for pattern in patterns:
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match = re.search(pattern, output, re.IGNORECASE)
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if match:
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monitor_iface = match.group(1)
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print(f"[WiFi] Found monitor interface via pattern '{pattern}': {monitor_iface}", flush=True)
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break
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# Method 3: Check if original interface now in monitor mode
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if not monitor_iface:
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# Check if original interface is now in monitor mode
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try:
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result = subprocess.run(['iwconfig', interface], capture_output=True, text=True, timeout=5)
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if 'Mode:Monitor' in result.stdout:
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monitor_iface = interface
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print(f"[WiFi] Original interface {interface} is now in monitor mode", flush=True)
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except:
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pass
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# Method 4: Check interface + 'mon'
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if not monitor_iface:
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potential = interface + 'mon'
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if potential in interfaces_after:
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monitor_iface = potential
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# Method 5: Last resort - assume interface + 'mon'
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if not monitor_iface:
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monitor_iface = interface + 'mon'
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print(f"[WiFi] Assuming monitor interface: {monitor_iface}", flush=True)
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# Verify the interface actually exists
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try:
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result = subprocess.run(['ip', 'link', 'show', monitor_iface], capture_output=True, text=True, timeout=5)
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if result.returncode != 0:
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# Interface doesn't exist - try to find any mon interface
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for iface in interfaces_after:
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if 'mon' in iface or iface.startswith('wl'):
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# Check if it's in monitor mode
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try:
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check = subprocess.run(['iwconfig', iface], capture_output=True, text=True, timeout=5)
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if 'Mode:Monitor' in check.stdout:
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monitor_iface = iface
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print(f"[WiFi] Found working monitor interface: {monitor_iface}", flush=True)
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break
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except:
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pass
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except:
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pass
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wifi_monitor_interface = monitor_iface
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wifi_queue.put({'type': 'info', 'text': f'Monitor mode enabled on {wifi_monitor_interface}'})
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return jsonify({'status': 'success', 'monitor_interface': wifi_monitor_interface})
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except Exception as e:
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import traceback
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print(f"[WiFi] Error enabling monitor mode: {e}\n{traceback.format_exc()}", flush=True)
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return jsonify({'status': 'error', 'message': str(e)})
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# Fallback to iw (Linux)
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