main/main.c (simple sample)

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

/* Simple HTTP + SSL Server Example This example code is in the Public Domain (or CC0 licensed, at your option.) Unless required by applicable law or agreed to in writing, this software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */ #include <esp_wifi.h> #include <esp_event.h> #include <esp_log.h> #include <esp_system.h> #include <nvs_flash.h> #include <sys/param.h> #include "esp_netif.h" #include "esp_eth.h" #include "protocol_examples_common.h" #include <esp_https_server.h> #include "esp_tls.h" #include "sdkconfig.h" /* A simple example that demonstrates how to create GET and POST * handlers and start an HTTPS server. */ static const char *TAG = "example"; /* Event handler for catching system events */ static void event_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) { if (event_base == ESP_HTTPS_SERVER_EVENT) { if (event_id == HTTPS_SERVER_EVENT_ERROR) { esp_https_server_last_error_t *last_error = (esp_tls_last_error_t *) event_data; ESP_LOGE(TAG, "Error event triggered: last_error = %s, last_tls_err = %d, tls_flag = %d", esp_err_to_name(last_error->last_error), last_error->esp_tls_error_code, last_error->esp_tls_flags); } } } /* An HTTP GET handler */ static esp_err_t root_get_handler(httpd_req_t *req) { httpd_resp_set_type(req, "text/html"); httpd_resp_send(req, "<h1>Hello Secure World!</h1>", HTTPD_RESP_USE_STRLEN); return ESP_OK; } #if CONFIG_EXAMPLE_ENABLE_HTTPS_USER_CALLBACK #ifdef CONFIG_ESP_TLS_USING_MBEDTLS static void print_peer_cert_info(const mbedtls_ssl_context *ssl) { const mbedtls_x509_crt *cert; const size_t buf_size = 1024; char *buf = calloc(buf_size, sizeof(char)); if (buf == NULL) { ESP_LOGE(TAG, "Out of memory - Callback execution failed!"); return; } // Logging the peer certificate info cert = mbedtls_ssl_get_peer_cert(ssl); if (cert != NULL) { mbedtls_x509_crt_info((char *) buf, buf_size - 1, " ", cert); ESP_LOGI(TAG, "Peer certificate info:\n%s", buf); } else { ESP_LOGW(TAG, "Could not obtain the peer certificate!"); } free(buf); } #endif /** * Example callback function to get the certificate of connected clients, * whenever a new SSL connection is created and closed * * Can also be used to other information like Socket FD, Connection state, etc. * * NOTE: This callback will not be able to obtain the client certificate if the * following config `Set minimum Certificate Verification mode to Optional` is * not enabled (enabled by default in this example). * * The config option is found here - Component config → ESP-TLS * */ static void https_server_user_callback(esp_https_server_user_cb_arg_t *user_cb) { ESP_LOGI(TAG, "User callback invoked!"); #ifdef CONFIG_ESP_TLS_USING_MBEDTLS mbedtls_ssl_context *ssl_ctx = NULL; #endif switch(user_cb->user_cb_state) { case HTTPD_SSL_USER_CB_SESS_CREATE: ESP_LOGD(TAG, "At session creation"); // Logging the socket FD int sockfd = -1; esp_err_t esp_ret; esp_ret = esp_tls_get_conn_sockfd(user_cb->tls, &sockfd); if (esp_ret != ESP_OK) { ESP_LOGE(TAG, "Error in obtaining the sockfd from tls context"); break; } ESP_LOGI(TAG, "Socket FD: %d", sockfd); #ifdef CONFIG_ESP_TLS_USING_MBEDTLS ssl_ctx = (mbedtls_ssl_context *) esp_tls_get_ssl_context(user_cb->tls); if (ssl_ctx == NULL) { ESP_LOGE(TAG, "Error in obtaining ssl context"); break; } // Logging the current ciphersuite ESP_LOGI(TAG, "Current Ciphersuite: %s", mbedtls_ssl_get_ciphersuite(ssl_ctx)); #endif break; case HTTPD_SSL_USER_CB_SESS_CLOSE: ESP_LOGD(TAG, "At session close"); #ifdef CONFIG_ESP_TLS_USING_MBEDTLS // Logging the peer certificate ssl_ctx = (mbedtls_ssl_context *) esp_tls_get_ssl_context(user_cb->tls); if (ssl_ctx == NULL) { ESP_LOGE(TAG, "Error in obtaining ssl context"); break; } print_peer_cert_info(ssl_ctx); #endif break; default: ESP_LOGE(TAG, "Illegal state!"); return; } } #endif static const httpd_uri_t root = { .uri = "/", .method = HTTP_GET, .handler = root_get_handler }; static httpd_handle_t start_webserver(void) { httpd_handle_t server = NULL; // Start the httpd server ESP_LOGI(TAG, "Starting server"); httpd_ssl_config_t conf = HTTPD_SSL_CONFIG_DEFAULT(); extern const unsigned char servercert_start[] asm("_binary_servercert_pem_start"); extern const unsigned char servercert_end[] asm("_binary_servercert_pem_end"); conf.servercert = servercert_start; conf.servercert_len = servercert_end - servercert_start; extern const unsigned char prvtkey_pem_start[] asm("_binary_prvtkey_pem_start"); extern const unsigned char prvtkey_pem_end[] asm("_binary_prvtkey_pem_end"); conf.prvtkey_pem = prvtkey_pem_start; conf.prvtkey_len = prvtkey_pem_end - prvtkey_pem_start; #if CONFIG_EXAMPLE_ENABLE_HTTPS_USER_CALLBACK conf.user_cb = https_server_user_callback; #endif esp_err_t ret = httpd_ssl_start(&server, &conf); if (ESP_OK != ret) { ESP_LOGI(TAG, "Error starting server!"); return NULL; } // Set URI handlers ESP_LOGI(TAG, "Registering URI handlers"); httpd_register_uri_handler(server, &root); return server; } static esp_err_t stop_webserver(httpd_handle_t server) { // Stop the httpd server return httpd_ssl_stop(server); } static void disconnect_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) { httpd_handle_t* server = (httpd_handle_t*) arg; if (*server) { if (stop_webserver(*server) == ESP_OK) { *server = NULL; } else { ESP_LOGE(TAG, "Failed to stop https server"); } } } static void connect_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) { httpd_handle_t* server = (httpd_handle_t*) arg; if (*server == NULL) { *server = start_webserver(); } } void app_main(void) { static httpd_handle_t server = NULL; ESP_ERROR_CHECK(nvs_flash_init()); ESP_ERROR_CHECK(esp_netif_init()); ESP_ERROR_CHECK(esp_event_loop_create_default()); /* Register event handlers to start server when Wi-Fi or Ethernet is connected, * and stop server when disconnection happens. */ #ifdef CONFIG_EXAMPLE_CONNECT_WIFI ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &connect_handler, &server)); ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_DISCONNECTED, &disconnect_handler, &server)); #endif // CONFIG_EXAMPLE_CONNECT_WIFI #ifdef CONFIG_EXAMPLE_CONNECT_ETHERNET ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_ETH_GOT_IP, &connect_handler, &server)); ESP_ERROR_CHECK(esp_event_handler_register(ETH_EVENT, ETHERNET_EVENT_DISCONNECTED, &disconnect_handler, &server)); #endif // CONFIG_EXAMPLE_CONNECT_ETHERNET ESP_ERROR_CHECK(esp_event_handler_register(ESP_HTTPS_SERVER_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL)); /* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig. * Read "Establishing Wi-Fi or Ethernet Connection" section in * examples/protocols/README.md for more information about this function. */ ESP_ERROR_CHECK(example_connect()); }