diff options
| -rw-r--r-- | lib/ipmi_fru.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/lib/ipmi_fru.c b/lib/ipmi_fru.c index 2d8daaf..4d1dbbb 100644 --- a/lib/ipmi_fru.c +++ b/lib/ipmi_fru.c @@ -141,6 +141,50 @@ read_fru_area(struct ipmi_intf * intf, struct fru_info *fru, uint8_t id, uint32_t offset, uint32_t length, uint8_t *frubuf); void free_fru_bloc(t_ipmi_fru_bloc *bloc); +/** + * Caclculate the simple FRU checksum as per IPMI FRU specification. + * Works both for the whole FRU image and for separate areas. + * + * @param[in] area Pointer to the start of checksummed area, + * the area must end with the checksum byte + * @param[in[ len Length of the checksummed area, including + * the trailing checksum byte + * @returns The calculated checksum byte + */ +static +uint8_t fru_calc_checksum(void *area, size_t len) +{ + uint8_t checksum = 0; + uint8_t * data = area; + size_t i; + + for (i = 0; i < len - 1; i++) + checksum += data[i]; + + return -checksum; +} + +/** + * Check if FRU checksum is valid. Works both on the + * whole FRU image and on separate areas. + * + * @param[in] area Pointer to the start of checksummed area, + * the area must end with the checksum byte + * @param[in[ len Length of the checksummed area, including + * the trailing checksum byte + * @returns The boolean state of checksum validity + * @retval true Checksum is valid + * @retval false Checsum in invalid + */ +static +bool fru_checksum_is_valid(void *area, size_t len) +{ + uint8_t * data = area; + + /* Checksum is valid when the stored checksum equals calculated */ + return data[len - 1] == fru_calc_checksum(area, len); +} + /* get_fru_area_str - Parse FRU area string from raw data * * @data: raw FRU data @@ -1048,6 +1092,12 @@ fru_area_print_chassis(struct ipmi_intf * intf, struct fru_info * fru, } } + /* Check area checksum */ + printf(" Chassis Area Checksum : %s\n", + fru_checksum_is_valid(fru_data, fru_len) + ? "OK" + : "INVALID"); + free_n(&fru_data); } @@ -1159,6 +1209,12 @@ fru_area_print_board(struct ipmi_intf * intf, struct fru_info * fru, break; } + /* Check area checksum */ + printf(" Board Area Checksum : %s\n", + fru_checksum_is_valid(fru_data, fru_len) + ? "OK" + : "INVALID"); + free_n(&fru_data); } @@ -1281,6 +1337,12 @@ fru_area_print_product(struct ipmi_intf * intf, struct fru_info * fru, break; } + /* Check area checksum */ + printf(" Product Area Checksum : %s\n", + fru_checksum_is_valid(fru_data, fru_len) + ? "OK" + : "INVALID"); + free_n(&fru_data); } |