diff --git a/examples/provisioning/ble_prov/main/app_prov_handlers.c b/examples/provisioning/ble_prov/main/app_prov_handlers.c index 4a0c0d99a..05dc895dc 100644 --- a/examples/provisioning/ble_prov/main/app_prov_handlers.c +++ b/examples/provisioning/ble_prov/main/app_prov_handlers.c @@ -98,10 +98,14 @@ static esp_err_t set_config_handler(const wifi_prov_config_set_data_t *req_data, ESP_LOGI(TAG, "WiFi Credentials Received : \n\tssid %s \n\tpassword %s", req_data->ssid, req_data->password); - memcpy((char *) wifi_cfg->sta.ssid, req_data->ssid, - strnlen(req_data->ssid, sizeof(wifi_cfg->sta.ssid))); - memcpy((char *) wifi_cfg->sta.password, req_data->password, - strnlen(req_data->password, sizeof(wifi_cfg->sta.password))); + + /* Using strncpy allows the max SSID length to be 32 bytes (as per 802.11 standard). + * But this doesn't guarantee that the saved SSID will be null terminated, because + * wifi_cfg->sta.ssid is also 32 bytes long (without extra 1 byte for null character). + * Although, this is not a matter for concern because esp_wifi library reads the SSID + * upto 32 bytes in absence of null termination */ + strncpy((char *) wifi_cfg->sta.ssid, req_data->ssid, sizeof(wifi_cfg->sta.ssid)); + strlcpy((char *) wifi_cfg->sta.password, req_data->password, sizeof(wifi_cfg->sta.password)); return ESP_OK; } diff --git a/examples/provisioning/console_prov/main/app_prov_handlers.c b/examples/provisioning/console_prov/main/app_prov_handlers.c index 49c29739f..e3fa61496 100644 --- a/examples/provisioning/console_prov/main/app_prov_handlers.c +++ b/examples/provisioning/console_prov/main/app_prov_handlers.c @@ -98,10 +98,14 @@ static esp_err_t set_config_handler(const wifi_prov_config_set_data_t *req_data, ESP_LOGI(TAG, "WiFi Credentials Received : \n\tssid %s \n\tpassword %s", req_data->ssid, req_data->password); - memcpy((char *) wifi_cfg->sta.ssid, req_data->ssid, - strnlen(req_data->ssid, sizeof(wifi_cfg->sta.ssid))); - memcpy((char *) wifi_cfg->sta.password, req_data->password, - strnlen(req_data->password, sizeof(wifi_cfg->sta.password))); + + /* Using strncpy allows the max SSID length to be 32 bytes (as per 802.11 standard). + * But this doesn't guarantee that the saved SSID will be null terminated, because + * wifi_cfg->sta.ssid is also 32 bytes long (without extra 1 byte for null character). + * Although, this is not a matter for concern because esp_wifi library reads the SSID + * upto 32 bytes in absence of null termination */ + strncpy((char *) wifi_cfg->sta.ssid, req_data->ssid, sizeof(wifi_cfg->sta.ssid)); + strlcpy((char *) wifi_cfg->sta.password, req_data->password, sizeof(wifi_cfg->sta.password)); return ESP_OK; } diff --git a/examples/provisioning/custom_config/main/app_prov.c b/examples/provisioning/custom_config/main/app_prov.c index 6ed3df19a..1bd773386 100644 --- a/examples/provisioning/custom_config/main/app_prov.c +++ b/examples/provisioning/custom_config/main/app_prov.c @@ -327,13 +327,13 @@ static esp_err_t start_wifi_ap(const char *ssid, const char *pass) }; strncpy((char *) wifi_config.ap.ssid, ssid, sizeof(wifi_config.ap.ssid)); - wifi_config.ap.ssid_len = strlen(ssid); + wifi_config.ap.ssid_len = strnlen(ssid, sizeof(wifi_config.ap.ssid)); if (strlen(pass) == 0) { memset(wifi_config.ap.password, 0, sizeof(wifi_config.ap.password)); wifi_config.ap.authmode = WIFI_AUTH_OPEN; } else { - strncpy((char *) wifi_config.ap.password, pass, sizeof(wifi_config.ap.password)); + strlcpy((char *) wifi_config.ap.password, pass, sizeof(wifi_config.ap.password)); wifi_config.ap.authmode = WIFI_AUTH_WPA_WPA2_PSK; } diff --git a/examples/provisioning/custom_config/main/app_prov_handlers.c b/examples/provisioning/custom_config/main/app_prov_handlers.c index c67eeebca..2f320890e 100644 --- a/examples/provisioning/custom_config/main/app_prov_handlers.c +++ b/examples/provisioning/custom_config/main/app_prov_handlers.c @@ -110,10 +110,14 @@ static esp_err_t set_config_handler(const wifi_prov_config_set_data_t *req_data, ESP_LOGI(TAG, "WiFi Credentials Received : \n\tssid %s \n\tpassword %s", req_data->ssid, req_data->password); - memcpy((char *) wifi_cfg->sta.ssid, req_data->ssid, - strnlen(req_data->ssid, sizeof(wifi_cfg->sta.ssid))); - memcpy((char *) wifi_cfg->sta.password, req_data->password, - strnlen(req_data->password, sizeof(wifi_cfg->sta.password))); + + /* Using strncpy allows the max SSID length to be 32 bytes (as per 802.11 standard). + * But this doesn't guarantee that the saved SSID will be null terminated, because + * wifi_cfg->sta.ssid is also 32 bytes long (without extra 1 byte for null character). + * Although, this is not a matter for concern because esp_wifi library reads the SSID + * upto 32 bytes in absence of null termination */ + strncpy((char *) wifi_cfg->sta.ssid, req_data->ssid, sizeof(wifi_cfg->sta.ssid)); + strlcpy((char *) wifi_cfg->sta.password, req_data->password, sizeof(wifi_cfg->sta.password)); return ESP_OK; } diff --git a/examples/provisioning/softap_prov/main/app_prov.c b/examples/provisioning/softap_prov/main/app_prov.c index 79c1e0da0..23e030415 100644 --- a/examples/provisioning/softap_prov/main/app_prov.c +++ b/examples/provisioning/softap_prov/main/app_prov.c @@ -314,13 +314,13 @@ static esp_err_t start_wifi_ap(const char *ssid, const char *pass) }; strncpy((char *) wifi_config.ap.ssid, ssid, sizeof(wifi_config.ap.ssid)); - wifi_config.ap.ssid_len = strlen(ssid); + wifi_config.ap.ssid_len = strnlen(ssid, sizeof(wifi_config.ap.ssid)); if (strlen(pass) == 0) { memset(wifi_config.ap.password, 0, sizeof(wifi_config.ap.password)); wifi_config.ap.authmode = WIFI_AUTH_OPEN; } else { - strncpy((char *) wifi_config.ap.password, pass, sizeof(wifi_config.ap.password)); + strlcpy((char *) wifi_config.ap.password, pass, sizeof(wifi_config.ap.password)); wifi_config.ap.authmode = WIFI_AUTH_WPA_WPA2_PSK; } diff --git a/examples/provisioning/softap_prov/main/app_prov_handlers.c b/examples/provisioning/softap_prov/main/app_prov_handlers.c index 4a0c0d99a..05dc895dc 100644 --- a/examples/provisioning/softap_prov/main/app_prov_handlers.c +++ b/examples/provisioning/softap_prov/main/app_prov_handlers.c @@ -98,10 +98,14 @@ static esp_err_t set_config_handler(const wifi_prov_config_set_data_t *req_data, ESP_LOGI(TAG, "WiFi Credentials Received : \n\tssid %s \n\tpassword %s", req_data->ssid, req_data->password); - memcpy((char *) wifi_cfg->sta.ssid, req_data->ssid, - strnlen(req_data->ssid, sizeof(wifi_cfg->sta.ssid))); - memcpy((char *) wifi_cfg->sta.password, req_data->password, - strnlen(req_data->password, sizeof(wifi_cfg->sta.password))); + + /* Using strncpy allows the max SSID length to be 32 bytes (as per 802.11 standard). + * But this doesn't guarantee that the saved SSID will be null terminated, because + * wifi_cfg->sta.ssid is also 32 bytes long (without extra 1 byte for null character). + * Although, this is not a matter for concern because esp_wifi library reads the SSID + * upto 32 bytes in absence of null termination */ + strncpy((char *) wifi_cfg->sta.ssid, req_data->ssid, sizeof(wifi_cfg->sta.ssid)); + strlcpy((char *) wifi_cfg->sta.password, req_data->password, sizeof(wifi_cfg->sta.password)); return ESP_OK; }