| /* Copyright 2020 The ChromiumOS 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 "internal" |
| |
| /** |
| * 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; |
| } |