Add hostname resolution and fix UTF-8 encoding issues

opnsense_device_manager.py

@@ -6,6 +6,7 @@ Helps discover devices on the network and manage MAC-based internet blocking
 
 import requests
 import json
+import socket
 from typing import List, Dict
 from urllib3.exceptions import InsecureRequestWarning
 requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
@@ -44,6 +45,15 @@ class OPNsenseDeviceManager:
             print(f"Error making request to {endpoint}: {e}")
             return None
     
+    def _get_hostname(self, ip: str) -> str:
+        """Try to resolve hostname from IP address"""
+        try:
+            hostname, _, _ = socket.gethostbyaddr(ip)
+            return hostname
+        except (socket.herror, socket.gaierror, socket.timeout):
+            return ""
+
+    
     def discover_devices(self) -> List[Dict]:
         """Discover all devices from ARP table"""
         result = self._make_request("diagnostics/interface/getArp")
@@ -72,20 +82,30 @@ class OPNsenseDeviceManager:
             
             seen_macs.add(mac)
             
+            # Try to get hostname
+            hostname = self._get_hostname(ip)
+            
             device_info = {
                 'mac': mac,
                 'ip': ip,
+                'hostname': hostname,
                 'manufacturer': manufacturer,
                 'intf_description': entry.get('intf_description', 'LAN'),
-                'suggested_name': self._suggest_device_name(manufacturer, ip)
+                'suggested_name': self._suggest_device_name(manufacturer, ip, hostname)
             }
             
             devices.append(device_info)
         
         return sorted(devices, key=lambda x: x['ip'])
     
-    def _suggest_device_name(self, manufacturer: str, ip: str) -> str:
-        """Suggest a device name based on manufacturer"""
+    def _suggest_device_name(self, manufacturer: str, ip: str, hostname: str = "") -> str:
+        """Suggest a device name based on manufacturer and hostname"""
+        # If we have a hostname, use it
+        if hostname:
+            # Clean up hostname (remove domain suffix if present)
+            clean_hostname = hostname.split('.')[0]
+            return clean_hostname
+        
         manufacturer = manufacturer.lower()
         
         if 'apple' in manufacturer:
@@ -215,6 +235,8 @@ class OPNsenseDeviceManager:
             for device in device_list:
                 report += f"  MAC: {device['mac']}\n"
                 report += f"  IP:  {device['ip']}\n"
+                if device['hostname']:
+                    report += f"  Hostname: {device['hostname']}\n"
                 report += f"  Suggested Name: {device['suggested_name']}\n"
                 report += "\n"
         
@@ -225,14 +247,16 @@ class OPNsenseDeviceManager:
         """Export devices in a format easy to copy into Home Assistant"""
         devices = self.discover_devices()
         
-        with open(output_file, 'w') as f:
+        with open(output_file, 'w', encoding='utf-8') as f:
             f.write("# Copy these MAC addresses into your Home Assistant input_text entities\n")
-            f.write("# Format: device_name | MAC Address | IP | Manufacturer\n\n")
+            f.write("# Format: device_name | MAC Address | IP | Hostname | Manufacturer\n\n")
             
             for device in devices:
+                hostname = device['hostname'] if device['hostname'] else "N/A"
                 f.write(f"{device['suggested_name']:<40} | "
                        f"{device['mac']:<20} | "
                        f"{device['ip']:<15} | "
+                       f"{hostname:<30} | "
                        f"{device['manufacturer']}\n")
         
         print(f"Device list exported to: {output_file}")
@@ -272,6 +296,8 @@ def main():
                 print(f"{idx}. {device['suggested_name']}")
                 print(f"   MAC: {device['mac']}")
                 print(f"   IP:  {device['ip']}")
+                if device['hostname']:
+                    print(f"   Hostname: {device['hostname']}")
                 print(f"   Manufacturer: {device['manufacturer']}")
                 print()
         
@@ -281,7 +307,7 @@ def main():
             
             save = input("Save report to file? (y/n): ").strip().lower()
             if save == 'y':
-                with open('device_report.txt', 'w') as f:
+                with open('device_report.txt', 'w', encoding='utf-8') as f:
                     f.write(report)
                 print("Report saved to: device_report.txt")