coreboot-kgpe-d16/util/cbfstool/elogtool.c

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/* SPDX-License-Identifier: BSD-3-Clause */
#include <assert.h>
#include <getopt.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <common.h>
#include <commonlib/bsd/elog.h>
#include <flashrom.h>
#include "eventlog.h"
/* Only refers to the data max size. The "-1" is the checksum byte */
#define ELOG_MAX_EVENT_DATA_SIZE (ELOG_MAX_EVENT_SIZE - sizeof(struct event_header) - 1)
enum elogtool_return {
ELOGTOOL_EXIT_SUCCESS = 0,
ELOGTOOL_EXIT_BAD_ARGS,
ELOGTOOL_EXIT_READ_ERROR,
ELOGTOOL_EXIT_WRITE_ERROR,
ELOGTOOL_EXIT_NOT_ENOUGH_MEMORY,
ELOGTOOL_EXIT_INVALID_ELOG_FORMAT,
ELOGTOOL_EXIT_NOT_ENOUGH_BUFFER_SPACE,
};
static int cmd_list(const struct buffer *);
static int cmd_clear(const struct buffer *);
static int cmd_add(const struct buffer *);
static const struct {
const char *name;
int (*func)(const struct buffer *buf);
/* Whether it requires to write the buffer back */
bool write_back;
} cmds[] = {
{"list", cmd_list, false},
{"clear", cmd_clear, true},
{"add", cmd_add, true},
};
static char **cmd_argv; /* Command arguments */
static char *argv0; /* Used as invoked_as */
static struct option long_options[] = {
{"file", required_argument, 0, 'f'},
{"help", no_argument, 0, 'h'},
{NULL, 0, 0, 0},
};
static void usage(char *invoked_as)
{
fprintf(stderr, "elogtool: edit elog events\n\n"
"USAGE:\n"
"\t%s COMMAND [-f <filename>]\n\n"
"where, COMMAND is:\n"
" list lists all the event logs in human readable format\n"
" clear clears all the event logs\n"
" add <event_type> [event_data] add an entry to the event log\n"
"\n"
"ARGS\n"
"-f, --file <filename> File that holds event log partition.\n"
" If empty it will try to read/write from/to\n"
" the " ELOG_RW_REGION_NAME " using flashrom.\n"
"-h, --help Print this help\n",
invoked_as);
}
/*
* If filename is empty, read RW_ELOG from flashrom.
* Otherwise read the RW_ELOG from a file.
* It fails if the ELOG header is invalid.
* On success, buffer must be freed by caller.
*/
static int elog_read(struct buffer *buffer, const char *filename)
{
if (filename == NULL) {
if (flashrom_host_read(buffer, ELOG_RW_REGION_NAME) != 0) {
fprintf(stderr, "Could not read RW_ELOG region using flashrom\n");
return ELOGTOOL_EXIT_READ_ERROR;
}
} else if (buffer_from_file(buffer, filename) != 0) {
fprintf(stderr, "Could not read input file: %s\n", filename);
return ELOGTOOL_EXIT_READ_ERROR;
}
if (elog_verify_header(buffer_get(buffer)) != CB_SUCCESS) {
fprintf(stderr, "FATAL: Invalid elog header\n");
buffer_delete(buffer);
return ELOGTOOL_EXIT_INVALID_ELOG_FORMAT;
}
return ELOGTOOL_EXIT_SUCCESS;
}
/*
* If filename is NULL, it saves the buffer using flashrom.
* Otherwise, it saves the buffer in the given filename.
*/
static int elog_write(struct buffer *buffer, const char *filename)
{
if (filename == NULL) {
if (flashrom_host_write(buffer, ELOG_RW_REGION_NAME) != 0) {
fprintf(stderr,
"Failed to write to RW_ELOG region using flashrom\n");
return ELOGTOOL_EXIT_WRITE_ERROR;
}
return ELOGTOOL_EXIT_SUCCESS;
}
if (buffer_write_file(buffer, filename) != 0) {
fprintf(stderr, "Failed to write to file %s\n", filename);
return ELOGTOOL_EXIT_WRITE_ERROR;
}
return ELOGTOOL_EXIT_SUCCESS;
}
/* Buffer offset must point to a valid event_header struct */
static size_t next_available_event_offset(const struct buffer *buf)
{
const struct event_header *event;
struct buffer copy, *iter = &copy;
assert(buffer_offset(buf) >= sizeof(struct elog_header));
buffer_clone(iter, buf);
while (buffer_size(iter) >= sizeof(struct event_header)) {
event = buffer_get(iter);
if (event->type == ELOG_TYPE_EOL || event->length == 0)
break;
assert(event->length <= buffer_size(iter));
buffer_seek(iter, event->length);
}
return buffer_offset(iter) - buffer_offset(buf);
}
/*
* Shrinks buffer by ~bytes_to_shrink, then appends a LOG_CLEAR event,
* and finally fills the remaining area with EOL events.
* Buffer offset must point to a valid event_header struct.
*/
static int shrink_buffer(const struct buffer *buf, size_t bytes_to_shrink)
{
struct buffer copy, *iter = &copy;
const struct event_header *event;
uint32_t cleared;
int remaining;
uint8_t *data;
assert(buffer_offset(buf) >= sizeof(struct elog_header));
buffer_clone(&copy, buf);
/* Save copy of first event for later */
data = buffer_get(buf);
/* Set buffer offset pointing to the event right after bytes_to_shrink */
while (buffer_offset(iter) < bytes_to_shrink) {
event = buffer_get(iter);
assert(!(event->type == ELOG_TYPE_EOL || event->length == 0));
buffer_seek(iter, event->length);
}
/* Must be relative to the buffer offset */
cleared = buffer_offset(iter) - buffer_offset(buf);
remaining = buffer_size(iter);
/* Overlapping copy */
memmove(data, data + cleared, remaining);
memset(data + remaining, ELOG_TYPE_EOL, cleared);
/* Re-init copy to have a clean offset. Needed for init_event() */
buffer_clone(&copy, buf);
buffer_seek(&copy, next_available_event_offset(&copy));
if (!eventlog_init_event(&copy, ELOG_TYPE_LOG_CLEAR, &cleared, sizeof(cleared)))
return ELOGTOOL_EXIT_NOT_ENOUGH_BUFFER_SPACE;
return ELOGTOOL_EXIT_SUCCESS;
}
static int cmd_list(const struct buffer *buf)
{
const struct event_header *event;
unsigned int count = 0;
/* Point to the first event */
event = buffer_get(buf) + sizeof(struct elog_header);
while ((const void *)(event) < buffer_end(buf)) {
if (((const void *)event + sizeof(*event)) >= buffer_end(buf)
|| event->length <= sizeof(*event)
|| event->length > ELOG_MAX_EVENT_SIZE
|| ((const void *)event + event->length) >= buffer_end(buf)
|| event->type == ELOG_TYPE_EOL)
break;
eventlog_print_event(event, count);
event = elog_get_next_event(event);
count++;
}
return ELOGTOOL_EXIT_SUCCESS;
}
/*
* Clears the elog events from the given buffer, which is a valid RW_ELOG region.
* A LOG_CLEAR event is appended.
*/
static int cmd_clear(const struct buffer *buf)
{
uint32_t used_data_size;
struct buffer copy;
/* Clone the buffer to avoid changing the offset of the original buffer */
buffer_clone(&copy, buf);
buffer_seek(&copy, sizeof(struct elog_header));
/*
* Calculate the size of the "used" buffer, needed for ELOG_TYPE_LOG_CLEAR.
* Then overwrite the entire buffer with ELOG_TYPE_EOL.
* Finally insert a LOG_CLEAR event into the buffer.
*/
used_data_size = next_available_event_offset(&copy);
memset(buffer_get(&copy), ELOG_TYPE_EOL, buffer_size(&copy));
if (!eventlog_init_event(&copy, ELOG_TYPE_LOG_CLEAR,
&used_data_size, sizeof(used_data_size)))
return ELOGTOOL_EXIT_NOT_ENOUGH_BUFFER_SPACE;
return ELOGTOOL_EXIT_SUCCESS;
}
static void cmd_add_usage(void)
{
usage(argv0);
fprintf(stderr, "\n\nSpecific to ADD command:\n"
"\n"
"<event_type>: an hexadecimal number (0-255). Prefix '0x' is optional\n"
"[event_data]: (optional) a series of hexadecimal numbers. Must be:\n"
" - len(event_data) %% 2 == 0\n"
" - len(event_data) in bytes <= %zu\n"
"\n"
"Example:\n"
"%s add 0x16 01ABF0 # 01ABF0 is actually three bytes: 0x01, 0xAB and 0xF0\n"
"%s add 17 # 17 is in hexa\n",
ELOG_MAX_EVENT_DATA_SIZE, argv0, argv0
);
}
static int cmd_add_parse_args(uint8_t *type, uint8_t *data, size_t *data_size)
{
char byte[3] = {0};
int argc = 0;
char *endptr;
long value;
int len;
while (cmd_argv[argc] != NULL)
argc++;
if (argc != 1 && argc != 2)
return ELOGTOOL_EXIT_BAD_ARGS;
/* Force type to be an hexa value to be consistent with the data values */
value = strtol(cmd_argv[0], NULL, 16);
if (value > 255) {
fprintf(stderr, "Error: Event type should be between 0-0xff; "
"got: 0x%04lx\n", value);
return ELOGTOOL_EXIT_BAD_ARGS;
}
*type = value;
if (argc == 1)
return ELOGTOOL_EXIT_SUCCESS;
/* Assuming argc == 2 */
len = strlen(cmd_argv[1]);
/* Needs 2 bytes per number */
if (len % 2 != 0) {
fprintf(stderr,
"Error: Event data length should be an even number; got: %d\n", len);
return ELOGTOOL_EXIT_BAD_ARGS;
}
*data_size = len / 2;
if (*data_size > ELOG_MAX_EVENT_DATA_SIZE) {
fprintf(stderr,
"Error: Event data length (in bytes) should be <= %zu; got: %zu\n",
ELOG_MAX_EVENT_DATA_SIZE, *data_size);
return ELOGTOOL_EXIT_BAD_ARGS;
}
for (unsigned int i = 0; i < *data_size; i++) {
byte[0] = *cmd_argv[1]++;
byte[1] = *cmd_argv[1]++;
data[i] = strtol(byte, &endptr, 16);
if (endptr != &byte[2]) {
fprintf(stderr, "Error: Event data length contains invalid data. "
"Only hexa digits are valid\n");
return ELOGTOOL_EXIT_BAD_ARGS;
}
}
return ELOGTOOL_EXIT_SUCCESS;
}
/* Appends an elog entry to EventLog buffer. */
static int cmd_add(const struct buffer *buf)
{
uint8_t data[ELOG_MAX_EVENT_DATA_SIZE];
size_t data_size = 0;
struct buffer copy;
uint8_t type = 0;
size_t next_event;
size_t threshold;
int ret;
if (cmd_add_parse_args(&type, data, &data_size) != ELOGTOOL_EXIT_SUCCESS) {
cmd_add_usage();
return ELOGTOOL_EXIT_BAD_ARGS;
}
buffer_clone(&copy, buf);
buffer_seek(&copy, sizeof(struct elog_header));
threshold = buffer_size(&copy) * 3 / 4;
next_event = next_available_event_offset(&copy);
if (next_event > threshold) {
/* Shrink ~ 1/4 of the size */
ret = shrink_buffer(&copy, buffer_size(buf) - threshold);
if (ret != ELOGTOOL_EXIT_SUCCESS)
return ret;
next_event = next_available_event_offset(&copy);
}
buffer_seek(&copy, next_event);
if (!eventlog_init_event(&copy, type, data, data_size))
return ELOGTOOL_EXIT_NOT_ENOUGH_BUFFER_SPACE;
return ELOGTOOL_EXIT_SUCCESS;
}
int main(int argc, char **argv)
{
char *filename = NULL;
struct buffer buf;
unsigned int i;
int argflag;
int ret;
if (argc < 2) {
usage(argv[0]);
return ELOGTOOL_EXIT_BAD_ARGS;
}
while (1) {
int option_index;
argflag = getopt_long(argc, argv, "hf:", long_options, &option_index);
if (argflag == -1)
break;
switch (argflag) {
case 'h':
case '?':
usage(argv[0]);
return ELOGTOOL_EXIT_SUCCESS;
case 'f':
if (!optarg) {
usage(argv[0]);
return ELOGTOOL_EXIT_BAD_ARGS;
}
filename = optarg;
break;
default:
break;
}
}
/* At least one command must be available. */
if (optind >= argc) {
usage(argv[0]);
return ELOGTOOL_EXIT_BAD_ARGS;
}
/* Returned buffer must be freed. */
ret = elog_read(&buf, filename);
if (ret)
return ret;
for (i = 0; i < ARRAY_SIZE(cmds); i++) {
if (!strcmp(cmds[i].name, argv[optind])) {
/* For commands that parse their own arguments. */
cmd_argv = &argv[optind+1];
argv0 = argv[0];
ret = cmds[i].func(&buf);
break;
}
}
if (i == ARRAY_SIZE(cmds)) {
usage(argv[0]);
ret = ELOGTOOL_EXIT_BAD_ARGS;
}
if (!ret && cmds[i].write_back)
ret = elog_write(&buf, filename);
buffer_delete(&buf);
return ret;
}