261 lines
7.4 KiB
C
Executable File
261 lines
7.4 KiB
C
Executable File
/* OpenSSL server Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include "openssl_server_example.h"
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#include <string.h>
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#include "openssl/ssl.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/event_groups.h"
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#include "esp_log.h"
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#include "esp_wifi.h"
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#include "esp_event_loop.h"
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#include "nvs_flash.h"
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#include "lwip/sockets.h"
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#include "lwip/netdb.h"
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static EventGroupHandle_t wifi_event_group;
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/* The event group allows multiple bits for each event,
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but we only care about one event - are we connected
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to the AP with an IP? */
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const static int CONNECTED_BIT = BIT0;
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const static char *TAG = "Openssl_example";
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#define OPENSSL_EXAMPLE_SERVER_ACK "HTTP/1.1 200 OK\r\n" \
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"Content-Type: text/html\r\n" \
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"Content-Length: 98\r\n\r\n" \
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"<html>\r\n" \
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"<head>\r\n" \
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"<title>OpenSSL example</title></head><body>\r\n" \
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"OpenSSL server example!\r\n" \
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"</body>\r\n" \
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"</html>\r\n" \
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"\r\n"
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static void openssl_example_task(void *p)
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{
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int ret;
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SSL_CTX *ctx;
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SSL *ssl;
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int socket, new_socket;
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socklen_t addr_len;
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struct sockaddr_in sock_addr;
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char recv_buf[OPENSSL_EXAMPLE_RECV_BUF_LEN];
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const char send_data[] = OPENSSL_EXAMPLE_SERVER_ACK;
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const int send_bytes = sizeof(send_data);
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extern const unsigned char cacert_pem_start[] asm("_binary_cacert_pem_start");
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extern const unsigned char cacert_pem_end[] asm("_binary_cacert_pem_end");
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const unsigned int cacert_pem_bytes = cacert_pem_end - cacert_pem_start;
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extern const unsigned char prvtkey_pem_start[] asm("_binary_prvtkey_pem_start");
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extern const unsigned char prvtkey_pem_end[] asm("_binary_prvtkey_pem_end");
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const unsigned int prvtkey_pem_bytes = prvtkey_pem_end - prvtkey_pem_start;
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ESP_LOGI(TAG, "SSL server context create ......");
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/* For security reasons, it is best if you can use
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TLSv1_2_server_method() here instead of TLS_server_method().
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However some old browsers may not support TLS v1.2.
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*/
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ctx = SSL_CTX_new(TLS_server_method());
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if (!ctx) {
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ESP_LOGI(TAG, "failed");
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goto failed1;
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}
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ESP_LOGI(TAG, "OK");
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ESP_LOGI(TAG, "SSL server context set own certification......");
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ret = SSL_CTX_use_certificate_ASN1(ctx, cacert_pem_bytes, cacert_pem_start);
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if (!ret) {
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ESP_LOGI(TAG, "failed");
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goto failed2;
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}
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ESP_LOGI(TAG, "OK");
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ESP_LOGI(TAG, "SSL server context set private key......");
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ret = SSL_CTX_use_PrivateKey_ASN1(0, ctx, prvtkey_pem_start, prvtkey_pem_bytes);
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if (!ret) {
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ESP_LOGI(TAG, "failed");
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goto failed2;
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}
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ESP_LOGI(TAG, "OK");
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ESP_LOGI(TAG, "SSL server create socket ......");
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socket = socket(AF_INET, SOCK_STREAM, 0);
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if (socket < 0) {
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ESP_LOGI(TAG, "failed");
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goto failed2;
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}
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ESP_LOGI(TAG, "OK");
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ESP_LOGI(TAG, "SSL server socket bind ......");
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memset(&sock_addr, 0, sizeof(sock_addr));
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sock_addr.sin_family = AF_INET;
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sock_addr.sin_addr.s_addr = 0;
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sock_addr.sin_port = htons(OPENSSL_EXAMPLE_LOCAL_TCP_PORT);
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ret = bind(socket, (struct sockaddr*)&sock_addr, sizeof(sock_addr));
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if (ret) {
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ESP_LOGI(TAG, "failed");
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goto failed3;
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}
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ESP_LOGI(TAG, "OK");
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ESP_LOGI(TAG, "SSL server socket listen ......");
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ret = listen(socket, 32);
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if (ret) {
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ESP_LOGI(TAG, "failed");
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goto failed3;
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}
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ESP_LOGI(TAG, "OK");
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reconnect:
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ESP_LOGI(TAG, "SSL server create ......");
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ssl = SSL_new(ctx);
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if (!ssl) {
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ESP_LOGI(TAG, "failed");
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goto failed3;
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}
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ESP_LOGI(TAG, "OK");
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ESP_LOGI(TAG, "SSL server socket accept client ......");
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new_socket = accept(socket, (struct sockaddr *)&sock_addr, &addr_len);
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if (new_socket < 0) {
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ESP_LOGI(TAG, "failed" );
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goto failed4;
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}
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ESP_LOGI(TAG, "OK");
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SSL_set_fd(ssl, new_socket);
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ESP_LOGI(TAG, "SSL server accept client ......");
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ret = SSL_accept(ssl);
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if (!ret) {
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ESP_LOGI(TAG, "failed");
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goto failed5;
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}
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ESP_LOGI(TAG, "OK");
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ESP_LOGI(TAG, "SSL server read message ......");
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do {
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memset(recv_buf, 0, OPENSSL_EXAMPLE_RECV_BUF_LEN);
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ret = SSL_read(ssl, recv_buf, OPENSSL_EXAMPLE_RECV_BUF_LEN - 1);
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if (ret <= 0) {
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break;
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}
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ESP_LOGI(TAG, "SSL read: %s", recv_buf);
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if (strstr(recv_buf, "GET ") &&
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strstr(recv_buf, " HTTP/1.1")) {
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ESP_LOGI(TAG, "SSL get matched message")
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ESP_LOGI(TAG, "SSL write message")
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ret = SSL_write(ssl, send_data, send_bytes);
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if (ret > 0) {
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ESP_LOGI(TAG, "OK")
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} else {
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ESP_LOGI(TAG, "error")
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}
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break;
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}
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} while (1);
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SSL_shutdown(ssl);
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failed5:
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close(new_socket);
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new_socket = -1;
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failed4:
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SSL_free(ssl);
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ssl = NULL;
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goto reconnect;
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failed3:
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close(socket);
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socket = -1;
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failed2:
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SSL_CTX_free(ctx);
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ctx = NULL;
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failed1:
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vTaskDelete(NULL);
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return ;
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}
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static void openssl_client_init(void)
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{
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int ret;
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xTaskHandle openssl_handle;
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ret = xTaskCreate(openssl_example_task,
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OPENSSL_EXAMPLE_TASK_NAME,
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OPENSSL_EXAMPLE_TASK_STACK_WORDS,
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NULL,
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OPENSSL_EXAMPLE_TASK_PRORIOTY,
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&openssl_handle);
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if (ret != pdPASS) {
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ESP_LOGI(TAG, "create task %s failed", OPENSSL_EXAMPLE_TASK_NAME);
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}
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}
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static esp_err_t wifi_event_handler(void *ctx, system_event_t *event)
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{
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switch(event->event_id) {
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case SYSTEM_EVENT_STA_START:
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esp_wifi_connect();
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break;
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case SYSTEM_EVENT_STA_GOT_IP:
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xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
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openssl_client_init();
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break;
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case SYSTEM_EVENT_STA_DISCONNECTED:
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/* This is a workaround as ESP32 WiFi libs don't currently
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auto-reassociate. */
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esp_wifi_connect();
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xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
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break;
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default:
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break;
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}
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return ESP_OK;
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}
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static void wifi_conn_init(void)
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{
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tcpip_adapter_init();
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wifi_event_group = xEventGroupCreate();
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ESP_ERROR_CHECK( esp_event_loop_init(wifi_event_handler, NULL) );
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
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ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
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wifi_config_t wifi_config = {
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.sta = {
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.ssid = EXAMPLE_WIFI_SSID,
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.password = EXAMPLE_WIFI_PASS,
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},
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};
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ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
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ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
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ESP_LOGI(TAG, "start the WIFI SSID:[%s] password:[%s]\n", EXAMPLE_WIFI_SSID, EXAMPLE_WIFI_PASS);
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ESP_ERROR_CHECK( esp_wifi_start() );
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}
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void app_main(void)
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{
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ESP_ERROR_CHECK( nvs_flash_init() );
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wifi_conn_init();
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}
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