From 83a8e8601612a1612ef42883a1f8fd46ba723e1f Mon Sep 17 00:00:00 2001
From: Tiago <tiago.aica@outlook.pt>
Date: Sat, 14 Feb 2026 23:29:10 +0000
Subject: [PATCH] Update debian/set_mac_wifi.sh

---
 debian/set_mac_wifi.sh | 68 +++++++++++++++++++++++++++++++++++++++---
 1 file changed, 64 insertions(+), 4 deletions(-)

diff --git a/debian/set_mac_wifi.sh b/debian/set_mac_wifi.sh
index 65ff3ae..3a5e0d7 100644
--- a/debian/set_mac_wifi.sh
+++ b/debian/set_mac_wifi.sh
@@ -1,9 +1,10 @@
 #!/bin/bash
 # Script to set fixed MAC address and disable Wi-Fi if eth0 configuration succeeds
 # Must be run with sudo!
+# Update: Agora gera um MAC único automaticamente se nenhum for especificado (resolver problema do DM9601).
 
 # --- Configuration ---
-ETH0_MAC="00:00:00:00:00:00"  # Default MAC - will be changed by setup script
+ETH0_MAC="00:00:00:00:00:00"  # Default MAC - será alterado automaticamente se mantiver este valor
 # WLAN0_MAC="XX:XX:XX:XX:XX:XX"  # Uncomment and set if needed
 
 # Verify root privileges
@@ -113,9 +114,68 @@ disable_wifi() {
     fi
 }
 
-# --- Execution ---
-# Set MAC for eth0 and disable Wi-Fi if successful
+# --- Novas Funções Complementares (Dinâmicas) ---
+
+# Função para gerar um MAC único baseado no Serial do Raspberry Pi
+# Garante que cada dispositivo fica com um MAC diferente mas consistente
+generate_unique_mac() {
+    local serial
+    serial=$(awk '/Serial/ {print $3}' /proc/cpuinfo | tr -d ' ')
+    
+    if [ -z "$serial" ]; then
+        # Fallback aleatório caso não encontre serial
+        printf '%02X:%02X:%02X:%02X:%02X:%02X' $((0x02 | (RANDOM % 256) & 0xFE)) $((RANDOM % 256)) $((RANDOM % 256)) $((RANDOM % 256)) $((RANDOM % 256)) $((RANDOM % 256))
+    else
+        # Gera hash do serial para criar os octetos
+        local hash
+        hash=$(echo -n "$serial-dm9601" | md5sum | cut -c1-10)
+        # 02 define como Local Admin Address
+        echo "02:${hash:0:2}:${hash:2:2}:${hash:4:2}:${hash:6:2}:${hash:8:2}"
+    fi
+}
+
+# Função para criar regra Udev persistente (Best Practice)
+# Isto faz com que o MAC seja aplicado no boot, evitando erros de "Device Busy"
+setup_udev_persistence() {
+    local interface="$1"
+    local target_mac="$2"
+    local log_file="/var/log/set_mac.log"
+
+    # Obtém o MAC original (físico) do adaptador
+    local original_mac
+    original_mac=$(ip link show "$interface" | awk '/ether/ {print $2}' | tr '[:upper:]' '[:lower:]')
+    target_mac=$(echo "$target_mac" | tr '[:upper:]' '[:lower:]')
+
+    if [ -z "$original_mac" ]; then return 1; fi
+
+    local rules_file="/etc/udev/rules.d/81-mac-spoof.rules"
+
+    # Se a regra já existe para este MAC original, não faz nada
+    if grep -q "$original_mac" "$rules_file" 2>/dev/null; then
+        return 0
+    fi
+
+    echo "$(date): Criando regra udev persistente para $interface" | tee -a "$log_file"
+    echo "ACTION==\"add\", SUBSYSTEM==\"net\", ATTR{address}==\"$original_mac\", RUN+=\"/usr/bin/ip link set dev \$name address $target_mac\"" >> "$rules_file"
+    udevadm control --reload-rules
+}
+
+# --- Execução Principal ---
+
+# LÓGICA COMPLEMENTAR:
+# Se ETH0_MAC for o valor padrão (00:00...) ou vazio, gera um novo automaticamente.
+if [ -z "$ETH0_MAC" ] || [ "$ETH0_MAC" == "00:00:00:00:00:00" ]; then
+    echo "$(date): Nenhum MAC específico definido. Gerando MAC único automático..." | tee -a /var/log/set_mac.log
+    ETH0_MAC=$(generate_unique_mac)
+    echo "$(date): Novo MAC gerado: $ETH0_MAC" | tee -a /var/log/set_mac.log
+fi
+
+# Executa a lógica original com o MAC definido (seja o do config ou o gerado)
 if set_mac "eth0" "$ETH0_MAC"; then
+    # Se definiu o MAC com sucesso, tenta criar persistência via Udev
+    # Isto resolve o problema do adapter mantendo o MAC em futuros boots
+    setup_udev_persistence "eth0" "$ETH0_MAC"
+
     # Check if disable_wifi is already running
     if ! pgrep -f "disable_wifi" > /dev/null; then
         #configure_static_ip
@@ -130,4 +190,4 @@ fi
 # Uncomment if you want to set MAC for wlan0 (optional)
 # if [[ -n "$WLAN0_MAC" ]]; then
 #     set_mac "wlan0" "$WLAN0_MAC"
-# fi
+# fi
\ No newline at end of file