alex/esp-idf
alex/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2024-10-05 20:47:46 -04:00
Code Issues Actions 2 Packages Projects Releases Wiki Activity

provisioning: use memcpy instead of strncpy for copying SSID

Browse Source 
Per WiFi library requirement, SSID can be non-null terminated string
if its length goes to 32 bytes (maximum). Use of strncpy in this case,
along with compiler optimization level -O2 results in some warnings
for potential use of non-null terminated strings.

Fix here ensures use of memcpy to copy SSID string upto appropriate
desired length. This helps to avoid compiler specific workaround
flags added earlier.

Closes https://github.com/espressif/esp-idf/issues/5866
Closes IDFGH-3983
This commit is contained in:
Mahavir Jain 2020-09-15 12:17:52 +05:30
parent c2f46eb802
commit 04b8564249
8 changed files with 37 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
components/wifi_provisioning/CMakeLists.txt
View File

@ -20,9 +20,3 @@ idf_component_register(SRCS "${srcs}"
PRIV_INCLUDE_DIRS src proto-c ../protocomm/proto-c
REQUIRES lwip protocomm
PRIV_REQUIRES protobuf-c bt mdns json)
# To avoid warning for strncpy
set_source_files_properties(src/handlers.c src/scheme_softap.c
PROPERTIES COMPILE_FLAGS
-Wno-stringop-truncation
)

3
components/wifi_provisioning/component.mk
View File

@ -2,9 +2,6 @@ COMPONENT_SRCDIRS := src proto-c
COMPONENT_ADD_INCLUDEDIRS := include
COMPONENT_PRIV_INCLUDEDIRS := src proto-c ../protocomm/proto-c/
# To avoid warning for strncpy in "handlers.c" and "scheme_softap.c"
CPPFLAGS += -Wno-stringop-truncation
ifndef CONFIG_BT_BLUEDROID_ENABLED
ifndef CONFIG_BT_NIMBLE_ENABLED
COMPONENT_OBJEXCLUDE := src/scheme_ble.o

11
components/wifi_provisioning/src/handlers.c
View File

@ -105,10 +105,15 @@ static esp_err_t set_config_handler(const wifi_prov_config_set_data_t *req_data,
ESP_LOGD(TAG, "Wi-Fi Credentials Received");
/* Using strncpy allows the max SSID length to be 32 bytes (as per 802.11 standard).
/* Using memcpy 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) */
strncpy((char *) wifi_cfg->sta.ssid, req_data->ssid, sizeof(wifi_cfg->sta.ssid));
* 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 */
const size_t ssid_len = strnlen(req_data->ssid, sizeof(wifi_cfg->sta.ssid));
/* Ensure SSID less than 32 bytes is null terminated */
memset(wifi_cfg->sta.ssid, 0, sizeof(wifi_cfg->sta.ssid));
memcpy(wifi_cfg->sta.ssid, req_data->ssid, ssid_len);
/* Using strlcpy allows both max passphrase length (63 bytes) and ensures null termination
* because size of wifi_cfg->sta.password is 64 bytes (1 extra byte for null character) */

7
components/wifi_provisioning/src/scheme_softap.c
View File

@ -43,8 +43,11 @@ 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 = strnlen(ssid, sizeof(wifi_config.ap.ssid));
/* SSID can be a non NULL terminated string if `ap.ssid_len` is specified
* Hence, memcpy is used to support 32 bytes long SSID per 802.11 standard */
const size_t ssid_len = strnlen(ssid, sizeof(wifi_config.ap.ssid));
memcpy(wifi_config.ap.ssid, ssid, ssid_len);
wifi_config.ap.ssid_len = ssid_len;
if (strlen(pass) == 0) {
memset(wifi_config.ap.password, 0, sizeof(wifi_config.ap.password));

8
examples/provisioning/ble_prov/main/app_prov_handlers.c
View File

@ -98,12 +98,16 @@ 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);
/* Using strncpy allows the max SSID length to be 32 bytes (as per 802.11 standard).
/* Using memcpy 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));
const size_t ssid_len = strnlen(req_data->ssid, sizeof(wifi_cfg->sta.ssid));
/* Ensure SSID less than 32 bytes is null terminated */
memset(wifi_cfg->sta.ssid, 0, sizeof(wifi_cfg->sta.ssid));
memcpy(wifi_cfg->sta.ssid, req_data->ssid, ssid_len);
strlcpy((char *) wifi_cfg->sta.password, req_data->password, sizeof(wifi_cfg->sta.password));
return ESP_OK;
}

8
examples/provisioning/console_prov/main/app_prov_handlers.c
View File

@ -98,12 +98,16 @@ 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);
/* Using strncpy allows the max SSID length to be 32 bytes (as per 802.11 standard).
/* Using memcpy 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));
const size_t ssid_len = strnlen(req_data->ssid, sizeof(wifi_cfg->sta.ssid));
/* Ensure SSID less than 32 bytes is null terminated */
memset(wifi_cfg->sta.ssid, 0, sizeof(wifi_cfg->sta.ssid));
memcpy(wifi_cfg->sta.ssid, req_data->ssid, ssid_len);
strlcpy((char *) wifi_cfg->sta.password, req_data->password, sizeof(wifi_cfg->sta.password));
return ESP_OK;
}

8
examples/provisioning/custom_config/main/app_prov_handlers.c
View File

@ -110,12 +110,16 @@ 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);
/* Using strncpy allows the max SSID length to be 32 bytes (as per 802.11 standard).
/* Using memcpy 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));
const size_t ssid_len = strnlen(req_data->ssid, sizeof(wifi_cfg->sta.ssid));
/* Ensure SSID less than 32 bytes is null terminated */
memset(wifi_cfg->sta.ssid, 0, sizeof(wifi_cfg->sta.ssid));
memcpy(wifi_cfg->sta.ssid, req_data->ssid, ssid_len);
strlcpy((char *) wifi_cfg->sta.password, req_data->password, sizeof(wifi_cfg->sta.password));
return ESP_OK;
}

8
examples/provisioning/softap_prov/main/app_prov_handlers.c
View File

@ -98,12 +98,16 @@ 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);
/* Using strncpy allows the max SSID length to be 32 bytes (as per 802.11 standard).
/* Using memcpy 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));
const size_t ssid_len = strnlen(req_data->ssid, sizeof(wifi_cfg->sta.ssid));
/* Ensure SSID less than 32 bytes is null terminated */
memset(wifi_cfg->sta.ssid, 0, sizeof(wifi_cfg->sta.ssid));
memcpy(wifi_cfg->sta.ssid, req_data->ssid, ssid_len);
strlcpy((char *) wifi_cfg->sta.password, req_data->password, sizeof(wifi_cfg->sta.password));
return ESP_OK;
}