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esp32example/.gitignore

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+.pio
+.vscode
+include/theSecrets.h
+components

esp32example/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16.0)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(ESP32Firewall)

esp32example/include/lwip_hooks.h

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+#ifndef _LWIP_HOOKS_H_
+#define _LWIP_HOOKS_H_
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    int lwip_hook_ip4_input(struct pbuf *pbuf, struct netif *input_netif);
+#define LWIP_HOOK_IP4_INPUT lwip_hook_ip4_input
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LWIP_HOOKS_H_ */

esp32example/include/theSecrets-example.h

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+#ifndef _THE_SECRETS_H_
+#define _THE_SECRETS_H_
+
+const char *ssid = "Wifi";
+const char *psk = "password";
+const char *username = "username";
+const char *password = "password";
+
+#endif

esp32example/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[platformio]
+default_envs = esp32
+
+[env:esp32]
+platform = espressif32
+board = az-delivery-devkit-v4
+framework = espidf
+monitor_speed = 115200
+lib_compat_mode = off
+build_flags = 
+	'-Iinclude'
+	'-DESP_IDF_LWIP_HOOK_FILENAME="lwip_hooks.h"'
+lib_deps = https://gitlab.hs-esslingen.de/toheer/iot-security-tools.git

esp32example/src/CMakeLists.txt

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+# This file was automatically generated for projects
+# without default 'CMakeLists.txt' file.
+
+FILE(GLOB_RECURSE app_sources ${CMAKE_SOURCE_DIR}/src/*.*)
+
+idf_component_register(SRCS ${app_sources})

esp32example/src/main.cpp

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+#include "Arduino.h"
+#include "theSecrets.h"
+#include "WiFi.h"
+#include "lwip_hooks.h"
+
+#include "esp32/Firewall.hpp"
+#include "esp32/API.hpp"
+
+fw::Firewall *firewall;
+fw::API *firewallApi;
+
+int lwip_hook_ip4_input(struct pbuf *pbuf, struct netif *input_netif)
+{
+    // Firewall is not setup yet
+    if (firewall != NULL)
+    {
+        if (firewall->is_packet_allowed(pbuf))
+            return 0;
+        else
+        {
+            pbuf_free(pbuf);
+            return 1;
+        }
+    }
+    return 0;
+}
+
+void initFirewall(const String ip)
+{
+    firewall = new fw::Firewall();
+    firewallApi = new fw::API(firewall, username, password, ip);
+}
+
+void handle_wifi_events(WiFiEvent_t event, WiFiEventInfo_t info)
+{
+    switch (event)
+    {
+    case ARDUINO_EVENT_WIFI_STA_START:
+        Serial.println("[WiFi] connecting...");
+        break;
+    case ARDUINO_EVENT_WIFI_STA_CONNECTED:
+        Serial.println("[WiFi] connected");
+        break;
+    case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:
+        Serial.println("[WiFi] disconnected");
+        WiFi.reconnect();
+        break;
+    case ARDUINO_EVENT_WIFI_STA_GOT_IP:
+        initFirewall(WiFi.localIP().toString());
+        break;
+    default:
+        Serial.print("[WiFi] other event: ");
+        Serial.println(event);
+    }
+}
+
+void setup()
+{
+    Serial.begin(115200);
+    WiFi.mode(WIFI_STA);
+    WiFi.onEvent(handle_wifi_events, ARDUINO_EVENT_MAX);
+    WiFi.begin(ssid, psk);
+
+    // fix for https://github.com/espressif/arduino-esp32/issues/4732
+    WiFi.config(((u32_t)0x0UL), ((u32_t)0x0UL), ((u32_t)0x0UL));
+}
+
+void loop()
+{
+    // https://docs.espressif.com/projects/arduino-esp32/en/latest/esp-idf_component.html
+    sleep(1);
+}