src: replace DEVICE env variable with get_ethernet_interface()

Use a python function to obtain the main net interface. Detect
the first ethernet inferface in use.
Stop using the DEVICE environment variable.

src/live/ogOperations.py

@@ -24,7 +24,7 @@ from src.live.parttypes import get_parttype
 
 from src.utils.image import *
 from src.utils.postinstall import configure_os
-from src.utils.net import ethtool
+from src.utils.net import *
 from src.utils.menu import generate_menu
 from src.utils.fs import *
 from src.utils.probe import os_probe, get_cache_dev_path
@@ -343,7 +343,7 @@ class OgLiveOperations:
                 f.truncate(0)
 
     def _poweroff_oglive(self, operation='poweroff'):
-        interface = os.getenv('DEVICE')
+        interface = get_ethernet_interface()
         cmd_ethtool = shlex.split(f'ethtool -s {interface} wol g')
         cmd_browser = shlex.split('pkill -9 browser')
         if shutil.which('busybox'):
@@ -772,7 +772,7 @@ class OgLiveOperations:
 
         cache = get_cache_dev_path()
         disks = get_disks()
-        interface = os.getenv('DEVICE')
+        interface = get_ethernet_interface()
         link = ethtool(interface)
         json_body = { 'serial_number': '',
                 'disk_setup': [],

src/log.py

@@ -9,6 +9,7 @@
 import logging
 import logging.config
 import os
+from src.utils.net import get_ethernet_interface
 
 
 class OgError(Exception):
@@ -67,7 +68,7 @@ def _default_logging_live():
             'samba': {
                 'class': 'logging.FileHandler',
                 'formatter': 'formatter.syslogtime',
-                'filename': f'/opt/opengnsys/log/{getifaddr(os.getenv("DEVICE"))}.log',
+                'filename': f'/opt/opengnsys/log/{getifaddr(get_ethernet_interface())}.log',
             }
         }
     rtlog = {

src/utils/cache.py

@@ -10,7 +10,7 @@ import logging
 import os
 
 from src.utils.fs import mount_mkdir, umount
-from src.utils.net import getifaddr
+from src.utils.net import *
 from src.utils.probe import get_cache_dev_path
 
 OG_IMAGE_PATH = '/opt/opengnsys/images/'
@@ -45,7 +45,7 @@ def write_cache_txt(content):
     """
     Dumps content to /opt/opengnsys/log/{ip}.cache.txt
     """
-    client_ip = getifaddr(os.getenv('DEVICE'))
+    client_ip = getifaddr(get_ethernet_interface())
     with open(OGCLIENT_LOG_CACHE.format(ip=client_ip), 'w') as f:
         logging.debug('Writing cache contents to %s.cache.txt', client_ip)
         f.write(content)

src/utils/menu.py

@@ -13,7 +13,7 @@ Utility module for ogBrowser menu generation
 import os
 import socket
 
-from src.utils.net import getifaddr, getifhwaddr, ethtool
+from src.utils.net import *
 
 MENU_TEMPLATE = """
 <div align="center" style="font-family: Arial, Helvetica, sans-serif;">
@@ -39,7 +39,7 @@ def generate_menu(part_setup):
     Writes html menu to /opt/opengnsys/log/{ip}.info.html based on a partition
     setup
     """
-    device = os.getenv('DEVICE')
+    device = get_ethernet_interface()
     if not device:
         return False
 

src/utils/net.py

@@ -10,6 +10,73 @@ import array
 import fcntl
 import socket
 import struct
+import psutil
+import logging
+
+def is_ethernet(interface):
+    SIOCGIFHWADDR = 0x8927
+    ARPHRD_ETHER = 1
+
+    try:
+        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        info = fcntl.ioctl(
+            s.fileno(),
+            SIOCGIFHWADDR,
+            struct.pack('256s', interface.encode('utf-8')[:15]))
+        if struct.unpack('H', info[16:18])[0] == ARPHRD_ETHER:
+            return True
+        return False
+    except IOError:
+        return False
+    finally:
+        s.close()
+
+def is_wifi(interface):
+    SIOCGIWNAME = 0x8B01  # Wireless-specific ioctl
+
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    try:
+        buffer = struct.pack('256s', interface.encode('utf-8'))
+        info = fcntl.ioctl(sock.fileno(), SIOCGIWNAME, buffer)
+        return True
+    except IOError:
+        return False
+    finally:
+        sock.close()
+
+def is_link_active(interface):
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+
+    try:
+        # Get interface flags
+        ifreq = struct.pack('16sh', interface.encode('utf-8'), 0)
+        flags = struct.unpack('16sh', fcntl.ioctl(sock.fileno(), 0x8913, ifreq))[1]
+
+        # Check if IFF_UP and IFF_RUNNING flags are set
+        if flags & 0x1 and flags & 0x40:
+            return True
+        else:
+            return False
+    except IOError:
+        return False
+    finally:
+        sock.close()
+
+def get_ethernet_interface():
+    eth_interfaces = []
+    interfaces = psutil.net_if_addrs()
+    for interface in interfaces:
+        if is_ethernet(interface) and not is_wifi(interface) and is_link_active(interface):
+            eth_interfaces.append(interface)
+
+    if len(eth_interfaces) > 1:
+        logging.info(f'Multiple active ethernet interfaces found: {", ".join(eth_interfaces)}. Using {eth_interfaces[0]}')
+
+    if not eth_interfaces:
+        logging.info('No valid ethernet interface found')
+        return None
+
+    return eth_interfaces[0]
 
 def ethtool(interface):
     try: