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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* For strdup */
#define _POSIX_C_SOURCE 200809L
#include <fcntl.h>
#include <limits.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "common.h" /* from cbfstool for buffer API. */
#include "subprocess.h" /* from vboot_reference */
#include "flashrom.h"
#define FLASHROM_EXEC_NAME "flashrom"
#define FLASHROM_PROGRAMMER_INTERNAL_AP "host"
/**
* Helper to create a temporary file.
*
* @param path_out An output pointer for the filename. Caller should free.
*
* @return 0 on success, -1 for file open error, or -2 for write error.
*/
static int create_temp_file(char **path_out)
{
int fd;
int rv;
char *path;
mode_t umask_save;
#if defined(__FreeBSD__)
#define P_tmpdir "/tmp"
#endif
*path_out = NULL;
path = strdup(P_tmpdir "/flashrom.XXXXXX");
/* Set the umask before mkstemp for security considerations. */
umask_save = umask(077);
fd = mkstemp(path);
umask(umask_save);
if (fd < 0) {
rv = -1;
goto fail;
}
close(fd);
*path_out = path;
return 0;
fail:
free(path);
return rv;
}
static int run_flashrom(const char *const argv[])
{
int status = subprocess_run(argv, &subprocess_null, &subprocess_null,
&subprocess_null);
if (status) {
fprintf(stderr, "Flashrom invocation failed (exit status %d):",
status);
for (const char *const *argp = argv; *argp; argp++)
fprintf(stderr, " %s", *argp);
fprintf(stderr, "\n");
return -1;
}
return 0;
}
int flashrom_host_read(struct buffer *buffer, const char *region)
{
char *tmpfile;
char region_param[PATH_MAX];
int rv;
if (create_temp_file(&tmpfile) != 0)
return -1;
if (region)
snprintf(region_param, sizeof(region_param), "%s:%s", region,
tmpfile);
const char *const argv[] = {
FLASHROM_EXEC_NAME,
"-p",
FLASHROM_PROGRAMMER_INTERNAL_AP,
"-r",
region ? "-i" : tmpfile,
region ? region_param : NULL,
NULL,
};
rv = run_flashrom(argv);
if (!rv)
rv = buffer_from_file(buffer, tmpfile);
unlink(tmpfile);
free(tmpfile);
return rv;
}
int flashrom_host_write(struct buffer *buffer, const char *region)
{
char *tmpfile;
char region_param[PATH_MAX];
int rv;
if (create_temp_file(&tmpfile) != 0)
return -1;
if (buffer_write_file(buffer, tmpfile) != 0) {
rv = -2;
goto fail;
}
if (region)
snprintf(region_param, sizeof(region_param), "%s:%s", region,
tmpfile);
const char *const argv[] = {
FLASHROM_EXEC_NAME,
"-p",
FLASHROM_PROGRAMMER_INTERNAL_AP,
"--noverify-all",
"-w",
region ? "-i" : tmpfile,
region ? region_param : NULL,
NULL,
};
rv = run_flashrom(argv);
fail:
unlink(tmpfile);
free(tmpfile);
return rv;
}
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