237 lines
7.2 KiB
C
237 lines
7.2 KiB
C
// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <string.h>
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#include <stdlib.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_tls.h"
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#include "esp_log.h"
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#include "esp_system.h"
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#include "esp_transport.h"
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#include "esp_transport_ssl.h"
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#include "esp_transport_utils.h"
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static const char *TAG = "TRANS_SSL";
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typedef enum {
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TRANS_SSL_INIT = 0,
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TRANS_SSL_CONNECTING,
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} transport_ssl_conn_state_t;
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/**
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* mbedtls specific transport data
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*/
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typedef struct {
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esp_tls_t *tls;
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esp_tls_cfg_t cfg;
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bool ssl_initialized;
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transport_ssl_conn_state_t conn_state;
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} transport_ssl_t;
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static int ssl_close(esp_transport_handle_t t);
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static int ssl_connect_async(esp_transport_handle_t t, const char *host, int port, int timeout_ms)
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{
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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if (ssl->conn_state == TRANS_SSL_INIT) {
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ssl->cfg.timeout_ms = timeout_ms;
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ssl->cfg.non_block = true;
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ssl->ssl_initialized = true;
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ssl->tls = calloc(1, sizeof(esp_tls_t));
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if (!ssl->tls) {
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return -1;
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}
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ssl->conn_state = TRANS_SSL_CONNECTING;
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}
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if (ssl->conn_state == TRANS_SSL_CONNECTING) {
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return esp_tls_conn_new_async(host, strlen(host), port, &ssl->cfg, ssl->tls);
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}
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return 0;
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}
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static int ssl_connect(esp_transport_handle_t t, const char *host, int port, int timeout_ms)
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{
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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ssl->cfg.timeout_ms = timeout_ms;
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ssl->ssl_initialized = true;
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ssl->tls = esp_tls_conn_new(host, strlen(host), port, &ssl->cfg);
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if (!ssl->tls) {
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ESP_LOGE(TAG, "Failed to open a new connection");
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return -1;
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}
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return 0;
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}
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static int ssl_poll_read(esp_transport_handle_t t, int timeout_ms)
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{
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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int ret = -1;
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fd_set readset;
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fd_set errset;
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FD_ZERO(&readset);
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FD_ZERO(&errset);
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FD_SET(ssl->tls->sockfd, &readset);
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FD_SET(ssl->tls->sockfd, &errset);
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struct timeval timeout;
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esp_transport_utils_ms_to_timeval(timeout_ms, &timeout);
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ret = select(ssl->tls->sockfd + 1, &readset, NULL, &errset, &timeout);
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if (ret > 0 && FD_ISSET(ssl->tls->sockfd, &errset)) {
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int sock_errno = 0;
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uint32_t optlen = sizeof(sock_errno);
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getsockopt(ssl->tls->sockfd, SOL_SOCKET, SO_ERROR, &sock_errno, &optlen);
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ESP_LOGE(TAG, "ssl_poll_read select error %d, errno = %s, fd = %d", sock_errno, strerror(sock_errno), ssl->tls->sockfd);
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ret = -1;
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}
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return ret;
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}
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static int ssl_poll_write(esp_transport_handle_t t, int timeout_ms)
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{
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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int ret = -1;
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fd_set writeset;
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fd_set errset;
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FD_ZERO(&writeset);
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FD_ZERO(&errset);
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FD_SET(ssl->tls->sockfd, &writeset);
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FD_SET(ssl->tls->sockfd, &errset);
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struct timeval timeout;
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esp_transport_utils_ms_to_timeval(timeout_ms, &timeout);
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ret = select(ssl->tls->sockfd + 1, NULL, &writeset, &errset, &timeout);
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if (ret > 0 && FD_ISSET(ssl->tls->sockfd, &errset)) {
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int sock_errno = 0;
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uint32_t optlen = sizeof(sock_errno);
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getsockopt(ssl->tls->sockfd, SOL_SOCKET, SO_ERROR, &sock_errno, &optlen);
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ESP_LOGE(TAG, "ssl_poll_write select error %d, errno = %s, fd = %d", sock_errno, strerror(sock_errno), ssl->tls->sockfd);
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ret = -1;
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}
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return ret;
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}
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static int ssl_write(esp_transport_handle_t t, const char *buffer, int len, int timeout_ms)
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{
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int poll, ret;
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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if ((poll = esp_transport_poll_write(t, timeout_ms)) <= 0) {
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ESP_LOGW(TAG, "Poll timeout or error, errno=%s, fd=%d, timeout_ms=%d", strerror(errno), ssl->tls->sockfd, timeout_ms);
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return poll;
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}
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ret = esp_tls_conn_write(ssl->tls, (const unsigned char *) buffer, len);
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if (ret < 0) {
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ESP_LOGE(TAG, "esp_tls_conn_write error, errno=%s", strerror(errno));
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}
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return ret;
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}
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static int ssl_read(esp_transport_handle_t t, char *buffer, int len, int timeout_ms)
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{
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int poll, ret;
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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if (esp_tls_get_bytes_avail(ssl->tls) <= 0) {
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if ((poll = esp_transport_poll_read(t, timeout_ms)) <= 0) {
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return poll;
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}
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}
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ret = esp_tls_conn_read(ssl->tls, (unsigned char *)buffer, len);
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if (ret < 0) {
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ESP_LOGE(TAG, "esp_tls_conn_read error, errno=%s", strerror(errno));
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}
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if (ret == 0) {
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ret = -1;
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}
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return ret;
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}
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static int ssl_close(esp_transport_handle_t t)
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{
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int ret = -1;
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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if (ssl->ssl_initialized) {
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esp_tls_conn_delete(ssl->tls);
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ssl->ssl_initialized = false;
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}
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return ret;
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}
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static int ssl_destroy(esp_transport_handle_t t)
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{
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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esp_transport_close(t);
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free(ssl);
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return 0;
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}
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void esp_transport_ssl_enable_global_ca_store(esp_transport_handle_t t)
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{
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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if (t && ssl) {
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ssl->cfg.use_global_ca_store = true;
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}
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}
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void esp_transport_ssl_set_cert_data(esp_transport_handle_t t, const char *data, int len)
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{
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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if (t && ssl) {
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ssl->cfg.cacert_pem_buf = (void *)data;
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ssl->cfg.cacert_pem_bytes = len + 1;
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}
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}
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void esp_transport_ssl_set_client_cert_data(esp_transport_handle_t t, const char *data, int len)
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{
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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if (t && ssl) {
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ssl->cfg.clientcert_pem_buf = (void *)data;
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ssl->cfg.clientcert_pem_bytes = len + 1;
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}
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}
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void esp_transport_ssl_set_client_key_data(esp_transport_handle_t t, const char *data, int len)
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{
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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if (t && ssl) {
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ssl->cfg.clientkey_pem_buf = (void *)data;
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ssl->cfg.clientkey_pem_bytes = len + 1;
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}
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}
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void esp_transport_ssl_skip_common_name_check(esp_transport_handle_t t)
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{
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transport_ssl_t *ssl = esp_transport_get_context_data(t);
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if (t && ssl) {
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ssl->cfg.skip_common_name = true;
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}
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}
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esp_transport_handle_t esp_transport_ssl_init()
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{
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esp_transport_handle_t t = esp_transport_init();
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transport_ssl_t *ssl = calloc(1, sizeof(transport_ssl_t));
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ESP_TRANSPORT_MEM_CHECK(TAG, ssl, return NULL);
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esp_transport_set_context_data(t, ssl);
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esp_transport_set_func(t, ssl_connect, ssl_read, ssl_write, ssl_close, ssl_poll_read, ssl_poll_write, ssl_destroy);
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esp_transport_set_async_connect_func(t, ssl_connect_async);
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return t;
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}
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