https client module for ota image download
This commit is contained in:
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a787a18d21
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d50985c577
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@ -27,213 +27,349 @@
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#include "esp_crt_bundle.h"
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/* Constants that aren't configurable in menuconfig */
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#define WEB_SERVER "ota.hendrikschutter.com"
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#define WEB_PORT "443"
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#define WEB_URL "https://ota.hendrikschutter.com/hello-world.bin"
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/* Constants that aren't configurable in menuconfig, yet */
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#define HTTPS_CLIENT_COMMON_NAME "ota.hendrikschutter.com"
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#define HTTPS_CLIENT_PORT "443"
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#define HTTPS_CLIENT_URL "https://ota.hendrikschutter.com/hello-world.bin"
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#define HTTPS_CLIENT_AUTH "b3RhOnB3" //base64("username:password")
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static const char *TAG = "example";
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#define HTTPS_CLIENT_OK 0
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#define HTTPS_CLIENT_ERROR -1
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#define HTTPS_CLIENT_ERROR_INIT_EMBEDTLS -2
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#define HTTPS_CLIENT_ERROR_INIT_CONNECT_TWO_SERVER -3
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#define HTTPS_CLIENT_ERROR_INIT_VALIDATE_SERVER -4
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#define HTTPS_CLIENT_ERROR_INIT_SEND_REQUEST -5
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static const char *REQUEST = "GET " WEB_URL " HTTP/1.1\r\n"
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"Host: "WEB_SERVER"\r\n"
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"User-Agent: esp-idf/1.0 esp32\r\n"
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"Authorization: Basic b3RhOnB3\r\n" //base64("username:password")
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"\r\n";
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static void https_get_task(void *pvParameters)
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struct HTTPS_Client
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{
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char buf[512];
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int ret, flags, len;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_ssl_context ssl;
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mbedtls_x509_crt cacert;
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mbedtls_ssl_config conf;
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mbedtls_net_context server_fd;
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};
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mbedtls_ssl_init(&ssl);
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mbedtls_x509_crt_init(&cacert);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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ESP_LOGI(TAG, "Seeding the random number generator");
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typedef int32_t https_client_ret_t;
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typedef struct HTTPS_Client HTTPS_Client_t;
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mbedtls_ssl_config_init(&conf);
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static const char *TAG = "https_client";
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mbedtls_entropy_init(&entropy);
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if((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, NULL, 0)) != 0)
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static const char *REQUEST = "GET " HTTPS_CLIENT_URL " HTTP/1.1\r\n"
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"Host: "HTTPS_CLIENT_COMMON_NAME"\r\n"
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"User-Agent: esp-idf/1.0 esp32\r\n"
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"Authorization: Basic " HTTPS_CLIENT_AUTH "\r\n"
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"\r\n";
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static HTTPS_Client_t sHTTPS_ClientConfig;
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https_client_ret_t https_clientInitialize();
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https_client_ret_t https_clientRetrieveData();
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https_client_ret_t https_clientDeinitialize();
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https_client_ret_t https_clientInitEmbedTLS();
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https_client_ret_t https_clientConnectToServer();
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https_client_ret_t https_clientValidateServer();
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https_client_ret_t https_clientSendRequest();
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https_client_ret_t https_clientInitialize()
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{
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https_client_ret_t i32RetHTTPClient = HTTPS_CLIENT_OK;
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i32RetHTTPClient = https_clientInitEmbedTLS();
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if(i32RetHTTPClient == HTTPS_CLIENT_OK)
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{
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ESP_LOGE(TAG, "mbedtls_ctr_drbg_seed returned %d", ret);
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abort();
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i32RetHTTPClient = https_clientConnectToServer();
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}
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ESP_LOGI(TAG, "Attaching the certificate bundle...");
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ret = esp_crt_bundle_attach(&conf);
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if(ret < 0)
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if(i32RetHTTPClient == HTTPS_CLIENT_OK)
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{
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ESP_LOGE(TAG, "esp_crt_bundle_attach returned -0x%x\n\n", -ret);
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abort();
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i32RetHTTPClient = https_clientValidateServer();
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}
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ESP_LOGI(TAG, "Setting hostname for TLS session...");
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/* Hostname set here should match CN in server certificate */
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if((ret = mbedtls_ssl_set_hostname(&ssl, WEB_SERVER)) != 0)
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if(i32RetHTTPClient == HTTPS_CLIENT_OK)
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{
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ESP_LOGE(TAG, "mbedtls_ssl_set_hostname returned -0x%x", -ret);
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abort();
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i32RetHTTPClient = https_clientSendRequest();
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}
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ESP_LOGI(TAG, "Setting up the SSL/TLS structure...");
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if((ret = mbedtls_ssl_config_defaults(&conf,
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MBEDTLS_SSL_IS_CLIENT,
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MBEDTLS_SSL_TRANSPORT_STREAM,
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MBEDTLS_SSL_PRESET_DEFAULT)) != 0)
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switch (i32RetHTTPClient)
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{
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ESP_LOGE(TAG, "mbedtls_ssl_config_defaults returned %d", ret);
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goto exit;
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case HTTPS_CLIENT_ERROR_INIT_EMBEDTLS:
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ESP_LOGE(TAG, "Unable to initialize EmbedTLS");
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i32RetHTTPClient = HTTPS_CLIENT_ERROR;
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break;
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case HTTPS_CLIENT_ERROR_INIT_CONNECT_TWO_SERVER:
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ESP_LOGE(TAG, "Unable to connect to server");
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i32RetHTTPClient = HTTPS_CLIENT_ERROR;
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break;
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case HTTPS_CLIENT_ERROR_INIT_VALIDATE_SERVER:
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ESP_LOGE(TAG, "Unable to validate the server");
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i32RetHTTPClient = HTTPS_CLIENT_ERROR;
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break;
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case HTTPS_CLIENT_ERROR_INIT_SEND_REQUEST:
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ESP_LOGE(TAG, "Unable to send request to server");
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i32RetHTTPClient = HTTPS_CLIENT_ERROR;
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break;
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case HTTPS_CLIENT_OK:
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ESP_LOGI(TAG, "HTTPS Client successfully initialized");
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i32RetHTTPClient = HTTPS_CLIENT_OK;
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break;
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default:
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i32RetHTTPClient = HTTPS_CLIENT_ERROR;
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ESP_LOGE(TAG, "Unknown error while init");
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break;
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}
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mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_REQUIRED);
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mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);
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mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
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return i32RetHTTPClient;
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}
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if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0)
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https_client_ret_t https_clientRetrieveData(unsigned char* pu8Data, uint32_t* pu32DataLenght, uint32_t* pu32BytesRead)
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{
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https_client_ret_t i32RetHTTPClient = HTTPS_CLIENT_OK;
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int32_t i32RetRetrieveData = ESP_OK;
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bzero(pu8Data, *pu32DataLenght);
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bool bRetriveData = true;
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while (bRetriveData)
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{
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ESP_LOGE(TAG, "mbedtls_ssl_setup returned -0x%x\n\n", -ret);
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goto exit;
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}
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//Reading HTTP response
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i32RetRetrieveData = mbedtls_ssl_read(&sHTTPS_ClientConfig.ssl, (unsigned char *)pu8Data, *pu32DataLenght);
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mbedtls_net_init(&server_fd);
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ESP_LOGI(TAG, "Connecting to %s:%s...", WEB_SERVER, WEB_PORT);
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if ((ret = mbedtls_net_connect(&server_fd, WEB_SERVER,
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WEB_PORT, MBEDTLS_NET_PROTO_TCP)) != 0)
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{
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ESP_LOGE(TAG, "mbedtls_net_connect returned -%x", -ret);
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goto exit;
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}
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ESP_LOGI(TAG, "Connected.");
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mbedtls_ssl_set_bio(&ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
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ESP_LOGI(TAG, "Performing the SSL/TLS handshake...");
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while ((ret = mbedtls_ssl_handshake(&ssl)) != 0)
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{
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE)
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if(i32RetRetrieveData > 0)
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{
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ESP_LOGE(TAG, "mbedtls_ssl_handshake returned -0x%x", -ret);
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goto exit;
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//Data received
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*pu32BytesRead = *pu32BytesRead + i32RetRetrieveData;
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*pu32DataLenght = *pu32DataLenght - *pu32BytesRead;
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if(*pu32DataLenght > 0)
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{
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//buffer not full yet --> read some more
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bRetriveData = true;
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}
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else
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{
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//buffer full --> stop reading
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bRetriveData = false;
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}
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}
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if(i32RetRetrieveData == 0)
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{
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//all data read --> stop reading
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bRetriveData = false;
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}
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if(i32RetRetrieveData == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
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{
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//connection is going to be closed
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i32RetHTTPClient = HTTPS_CLIENT_ERROR;
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bRetriveData = false;
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}
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}
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return i32RetHTTPClient;
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}
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https_client_ret_t https_clientDeinitialize()
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{
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https_client_ret_t i32RetHTTPClient = HTTPS_CLIENT_OK;
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i32RetHTTPClient = mbedtls_ssl_close_notify(&sHTTPS_ClientConfig.ssl);
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if(i32RetHTTPClient != ESP_OK)
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{
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ESP_LOGE(TAG, "mbedtls_ssl_close_notify returned 0x%x", i32RetHTTPClient);
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}
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mbedtls_ssl_session_reset(&sHTTPS_ClientConfig.ssl);
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mbedtls_net_free(&sHTTPS_ClientConfig.server_fd);
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return i32RetHTTPClient;
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}
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https_client_ret_t https_clientInitEmbedTLS() {
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https_client_ret_t i32RetHTTPClient = HTTPS_CLIENT_OK;
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int32_t i32RetEmbedTLS = ESP_OK;
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mbedtls_ssl_init(&sHTTPS_ClientConfig.ssl);
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mbedtls_x509_crt_init(&sHTTPS_ClientConfig.cacert);
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mbedtls_ctr_drbg_init(&sHTTPS_ClientConfig.ctr_drbg);
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mbedtls_ssl_config_init(&sHTTPS_ClientConfig.conf);
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mbedtls_entropy_init(&sHTTPS_ClientConfig.entropy);
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i32RetEmbedTLS = mbedtls_ctr_drbg_seed(&sHTTPS_ClientConfig.ctr_drbg, mbedtls_entropy_func, &sHTTPS_ClientConfig.entropy, NULL, 0);
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if(i32RetEmbedTLS!= ESP_OK)
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{
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ESP_LOGE(TAG, "mbedtls_ctr_drbg_seed returned %d", i32RetEmbedTLS);
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}
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if(i32RetEmbedTLS == ESP_OK)
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{
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//Attaching the certificate bundle
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i32RetEmbedTLS = esp_crt_bundle_attach(&sHTTPS_ClientConfig.conf);
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if(i32RetEmbedTLS != ESP_OK)
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{
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ESP_LOGE(TAG, "esp_crt_bundle_attach returned 0x%x\n\n", i32RetEmbedTLS);
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}
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}
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ESP_LOGI(TAG, "Verifying peer X.509 certificate...");
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if ((flags = mbedtls_ssl_get_verify_result(&ssl)) != 0)
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if(i32RetEmbedTLS == ESP_OK)
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{
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/* In real life, we probably want to close connection if ret != 0 */
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ESP_LOGW(TAG, "Failed to verify peer certificate!");
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bzero(buf, sizeof(buf));
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mbedtls_x509_crt_verify_info(buf, sizeof(buf), " ! ", flags);
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ESP_LOGW(TAG, "verification info: %s", buf);
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}
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else {
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ESP_LOGI(TAG, "Certificate verified.");
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//Setting hostname for TLS session.
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i32RetEmbedTLS = mbedtls_ssl_set_hostname(&sHTTPS_ClientConfig.ssl, HTTPS_CLIENT_COMMON_NAME);
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// Hostname set here should match CN in server certificate
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if(i32RetEmbedTLS != ESP_OK)
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{
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ESP_LOGE(TAG, "mbedtls_ssl_set_hostname returned 0x%x", i32RetEmbedTLS);
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}
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}
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if(i32RetEmbedTLS == ESP_OK)
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{
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//Setting up the SSL/TLS structure
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i32RetEmbedTLS = mbedtls_ssl_config_defaults(&sHTTPS_ClientConfig.conf,
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MBEDTLS_SSL_IS_CLIENT,
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MBEDTLS_SSL_TRANSPORT_STREAM,
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MBEDTLS_SSL_PRESET_DEFAULT);
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ESP_LOGI(TAG, "Cipher suite is %s", mbedtls_ssl_get_ciphersuite(&ssl));
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ESP_LOGI(TAG, "Writing HTTP request...");
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size_t written_bytes = 0;
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while(written_bytes < strlen(REQUEST)) {
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ret = mbedtls_ssl_write(&ssl,
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(const unsigned char *)REQUEST + written_bytes,
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strlen(REQUEST) - written_bytes);
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if (ret >= 0) {
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ESP_LOGI(TAG, "%d bytes written", ret);
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written_bytes += ret;
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} else if (ret != MBEDTLS_ERR_SSL_WANT_WRITE && ret != MBEDTLS_ERR_SSL_WANT_READ) {
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ESP_LOGE(TAG, "mbedtls_ssl_write returned -0x%x", -ret);
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goto exit;
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if(i32RetEmbedTLS != ESP_OK)
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{
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ESP_LOGE(TAG, "mbedtls_ssl_config_defaults returned %d", i32RetEmbedTLS);
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}
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}
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ESP_LOGI(TAG, "Reading HTTP response...");
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if(i32RetEmbedTLS == ESP_OK)
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{
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mbedtls_ssl_conf_authmode(&sHTTPS_ClientConfig.conf, MBEDTLS_SSL_VERIFY_REQUIRED);
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mbedtls_ssl_conf_ca_chain(&sHTTPS_ClientConfig.conf, &sHTTPS_ClientConfig.cacert, NULL);
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mbedtls_ssl_conf_rng(&sHTTPS_ClientConfig.conf, mbedtls_ctr_drbg_random, &sHTTPS_ClientConfig.ctr_drbg);
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//do
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/// {
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len = sizeof(buf) - 1;
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bzero(buf, sizeof(buf));
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ret = mbedtls_ssl_read(&ssl, (unsigned char *)buf, len);
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if(ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE)
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// continue;
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if(ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
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ret = 0;
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// break;
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i32RetEmbedTLS = mbedtls_ssl_setup(&sHTTPS_ClientConfig.ssl, &sHTTPS_ClientConfig.conf);
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if(i32RetEmbedTLS != ESP_OK)
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{
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ESP_LOGE(TAG, "mbedtls_ssl_setup returned -0x%x\n\n", i32RetEmbedTLS);
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}
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}
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if(ret < 0)
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if(i32RetEmbedTLS == ESP_OK)
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{
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ESP_LOGE(TAG, "mbedtls_ssl_read returned -0x%x", -ret);
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// break;
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mbedtls_net_init(&sHTTPS_ClientConfig.server_fd);
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}
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if(ret == 0)
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if (i32RetEmbedTLS != ESP_OK)
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{
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ESP_LOGI(TAG, "connection closed");
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// break;
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i32RetHTTPClient = HTTPS_CLIENT_ERROR_INIT_EMBEDTLS;
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}
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len = ret;
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return i32RetHTTPClient;
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}
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ESP_LOGI(TAG, "%d bytes read", len);
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https_client_ret_t https_clientConnectToServer()
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{
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https_client_ret_t i32RetHTTPClient = HTTPS_CLIENT_OK;
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int32_t i32RetServerConnect = ESP_OK;
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/* Print response directly to stdout as it is read */
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for(int i = 0; i < len; i++) {
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putchar(buf[i]);
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//printf("0x%x ", buf[i]);
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}
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printf("\n");
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// } while(1);
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ret = mbedtls_ssl_close_notify(&ssl);
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if(ret != 0)
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{
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ESP_LOGE(TAG, "mbedtls_ssl_close_notify returned 0x%x", ret);
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}
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exit:
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mbedtls_ssl_session_reset(&ssl);
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mbedtls_net_free(&server_fd);
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if(ret != 0)
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//Connecting to server
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i32RetServerConnect = mbedtls_net_connect(&sHTTPS_ClientConfig.server_fd, HTTPS_CLIENT_COMMON_NAME, HTTPS_CLIENT_PORT, MBEDTLS_NET_PROTO_TCP);
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if (i32RetServerConnect != ESP_OK)
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{
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mbedtls_strerror(ret, buf, 100);
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ESP_LOGE(TAG, "Last error was: -0x%x - %s", -ret, buf);
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ESP_LOGE(TAG, "mbedtls_net_connect returned %x", i32RetServerConnect);
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}
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putchar('\n'); // JSON output doesn't have a newline at end
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if(i32RetServerConnect == ESP_OK)
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{
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mbedtls_ssl_set_bio(&sHTTPS_ClientConfig.ssl, &sHTTPS_ClientConfig.server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
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static int request_count;
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ESP_LOGI(TAG, "Completed %d requests", ++request_count);
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//Performing the SSL/TLS handshake
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while ((i32RetServerConnect = mbedtls_ssl_handshake(&sHTTPS_ClientConfig.ssl)) != 0)
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{
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if ((i32RetServerConnect != MBEDTLS_ERR_SSL_WANT_READ) && (i32RetServerConnect != MBEDTLS_ERR_SSL_WANT_WRITE))
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{
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ESP_LOGE(TAG, "mbedtls_ssl_handshake returned 0x%x", i32RetServerConnect);
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}
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}
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}
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if(i32RetServerConnect != ESP_OK)
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{
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i32RetHTTPClient = HTTPS_CLIENT_ERROR_INIT_CONNECT_TWO_SERVER;
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}
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return i32RetHTTPClient;
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}
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https_client_ret_t https_clientValidateServer()
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{
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https_client_ret_t i32RetHTTPClient = HTTPS_CLIENT_OK;
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int32_t i32RetValidateServer = ESP_OK;
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||||
//Verifying peer X.509 certificate
|
||||
if ((i32RetValidateServer = mbedtls_ssl_get_verify_result(&sHTTPS_ClientConfig.ssl)) != 0)
|
||||
{
|
||||
ESP_LOGE(TAG, "Failed to verify peer certificate!");
|
||||
}
|
||||
|
||||
if(i32RetValidateServer != ESP_OK)
|
||||
{
|
||||
i32RetHTTPClient = HTTPS_CLIENT_ERROR_INIT_VALIDATE_SERVER;
|
||||
}
|
||||
return i32RetHTTPClient;
|
||||
}
|
||||
|
||||
https_client_ret_t https_clientSendRequest()
|
||||
{
|
||||
https_client_ret_t i32RetHTTPClient = HTTPS_CLIENT_OK;
|
||||
int32_t i32RetSendRequest = ESP_OK;
|
||||
uint32_t u32WrittenBytes = 0;
|
||||
bool bWrite = true;
|
||||
|
||||
//Writing HTTP request
|
||||
while((u32WrittenBytes < strlen(REQUEST)) && bWrite)
|
||||
{
|
||||
i32RetSendRequest = mbedtls_ssl_write(&sHTTPS_ClientConfig.ssl,
|
||||
(const unsigned char *)REQUEST + u32WrittenBytes,
|
||||
strlen(REQUEST) - u32WrittenBytes);
|
||||
if (i32RetSendRequest >= 0)
|
||||
{
|
||||
//bytes written
|
||||
u32WrittenBytes += i32RetSendRequest;
|
||||
} else if (i32RetSendRequest != MBEDTLS_ERR_SSL_WANT_WRITE && i32RetSendRequest != MBEDTLS_ERR_SSL_WANT_READ) {
|
||||
ESP_LOGE(TAG, "mbedtls_ssl_write returned 0x%x", i32RetSendRequest);
|
||||
bWrite = false;
|
||||
}
|
||||
}
|
||||
|
||||
if(bWrite == false)
|
||||
{
|
||||
i32RetHTTPClient = HTTPS_CLIENT_ERROR_INIT_SEND_REQUEST;
|
||||
}
|
||||
return i32RetHTTPClient;
|
||||
}
|
||||
|
||||
|
||||
ESP_LOGI(TAG, "going into endless loop!");
|
||||
|
||||
static void https_get_task(void *pvParameters)
|
||||
{
|
||||
|
||||
while(1) {
|
||||
https_clientInitialize();
|
||||
|
||||
uint32_t u32BufferLenght = 1024U;
|
||||
unsigned char buffer[1024U];
|
||||
uint32_t u32BytesRead = 0;
|
||||
|
||||
https_clientRetrieveData(buffer, &u32BufferLenght, &u32BytesRead);
|
||||
|
||||
// Print response directly to stdout as it is read
|
||||
for(uint32_t i = 0; i < u32BytesRead; i++) {
|
||||
putchar(buffer[i]);
|
||||
// printf("%x ", buffer[i]);
|
||||
}
|
||||
printf("\n END \n");
|
||||
|
||||
https_clientDeinitialize();
|
||||
|
||||
while(1)
|
||||
{
|
||||
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue