Remove interface availability check in main function to streamline execution flow

listener.py

@@ -39,6 +39,12 @@ vendor_cache = {}
 CHANNEL_LIST = [1, 6, 11, 36, 40, 48, 52, 64, 100, 104, 108, 112, 149, 153, 161] # Channels to hop
 CHANNEL_HOP_INTERVAL = 5   # Seconds per channel
 
+def safe_call(cmd):
+    try:
+        subprocess.check_call(cmd)
+    except subprocess.CalledProcessError as e:
+        print(f"[!] Command failed: {' '.join(cmd)}\n{e}")
+
 def get_channel_from_freq(freq):
     if 2412 <= freq <= 2472:
         return (freq - 2407) // 5
@@ -202,11 +208,11 @@ def write_csv(outfile):
 def reset_interface(interface):
     print(f"[~] Resetting interface {interface} to default state...")
     try:
-        subprocess.call(["ip", "link", "set", interface, "down"])
+        safe_call(["ip", "link", "set", interface, "down"])
         time.sleep(1)
-        subprocess.call(["iw", interface, "set", "type", "monitor"])
+        safe_call(["iw", interface, "set", "type", "monitor"])
         time.sleep(1)
-        subprocess.call(["ip", "link", "set", interface, "up"])
+        safe_call(["ip", "link", "set", interface, "up"])
         time.sleep(1)
         print(f"[+] Interface {interface} reset complete.")
     except Exception as e:
@@ -258,16 +264,28 @@ def channel_hopper(interface, hop_interval):
 def is_deadpoint(ap_bssid):
     return sum(ap_clients[ap_bssid].values()) < 2  # No meaningful client interaction
 
-def wait_for_interface_up(iface, timeout=5):
-    print(f"[~] Waiting for interface {iface} to become available...")
-    for _ in range(timeout * 10):  # check every 0.1s for `timeout` seconds
-        if iface in psutil.net_if_stats():
-            print(f"[+] Interface {iface} is up!")
-            return True
-        time.sleep(0.1)
-    print(f"[!] Interface {iface} did not become available in {timeout} seconds.")
+def wait_for_interface_up(interface, timeout=5):
+    import shutil
+    import time
+
+    for _ in range(timeout * 5):
+        result = shutil.which("iw")  # Just checking iw exists first
+        if not result:
+            print("[!] 'iw' not found.")
+            return False
+
+        try:
+            info = subprocess.check_output(["iw", "dev"]).decode()
+            if f"Interface {interface}" in info:
+                if "type monitor" in info:
+                    return True
+        except subprocess.CalledProcessError:
+            pass
+        time.sleep(0.2)
+    print(f"[!] Timeout waiting for interface {interface} to be up and in monitor mode.")
     return False
 
+
 # === Main ===
 def main():
     parser = ArgumentParser()
@@ -284,8 +302,10 @@ def main():
 
     reset_interface(args.monitor_iface)
     if not wait_for_interface_up(args.monitor_iface):
+        print("[!] Interface failed to become available. Exiting.")
         sys.exit(1)
 
+
     print(f"[+] Starting passive observer.")
     print(f"    Main interface: {args.main_iface}")
     print(f"    Monitor interface: {args.monitor_iface}")
@@ -339,8 +359,6 @@ def main():
         print(f"    {bssid} → {vendor}")
 
     reset_interface(args.monitor_iface)
-    if not wait_for_interface_up(args.monitor_iface):
-        sys.exit(1)
 
 def get_mac_vendor(mac):
     prefix = mac.upper()[0:8].replace(":", "-")