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/* Copyright 2014 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <inttypes.h>
#include <limits.h>
#include <stddef.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 "fmap.h"
#include "futility.h"
static const char usage[] = "\n"
"Usage: " MYNAME " %s [OPTIONS] FILE AREA:file [AREA:file ...]\n"
"\n"
"Replace the contents of specific FMAP areas. This is the complement\n"
"of " MYNAME " dump_fmap -x FILE AREA [AREA ...]\n"
"\n"
"Options:\n"
" -o OUTFILE Write the result to this file, instead of modifying\n"
" the input file. This is safer, since there are no\n"
" safeguards against doing something stupid.\n"
"\n"
"Example:\n"
"\n"
" This will clear the RO_VPD area, and scramble VBLOCK_B:\n"
"\n"
" " MYNAME " %s image.bin RO_VPD:/dev/zero VBLOCK_B:/dev/urandom\n"
"\n";
static void print_help(int argc, char *argv[])
{
printf(usage, argv[0], argv[0]);
}
enum {
OPT_HELP = 1000,
};
static const struct option long_opts[] = {
/* name hasarg *flag val */
{"help", 0, NULL, OPT_HELP},
{NULL, 0, NULL, 0},
};
static const char *short_opts = ":o:";
static int copy_to_area(const char *file, uint8_t *buf,
const uint32_t len, const char *area)
{
int retval = 0;
FILE *fp = fopen(file, "r");
if (!fp) {
ERROR("area %s: can't open %s for reading: %s\n",
area, file, strerror(errno));
return 1;
}
size_t n = fread(buf, 1, len, fp);
if (!n) {
if (feof(fp))
ERROR("area %s: unexpected EOF on %s\n", area, file);
if (ferror(fp))
ERROR("area %s: can't read from %s: %s\n",
area, file, strerror(errno));
retval = 1;
} else if (n < len) {
ERROR("Warning on area %s: only read %zu "
"(not %d) from %s\n", area, n, len, file);
}
if (fclose(fp)) {
ERROR("area %s: error closing %s: %s\n",
area, file, strerror(errno));
retval = 1;
}
return retval;
}
static int do_load_fmap(int argc, char *argv[])
{
char *outfile = NULL;
int errorcnt = 0;
int i;
opterr = 0; /* quiet, you */
while ((i = getopt_long(argc, argv, short_opts, long_opts, 0)) != -1) {
switch (i) {
case 'o':
outfile = optarg;
break;
case OPT_HELP:
print_help(argc, argv);
return !!errorcnt;
case '?':
if (optopt)
ERROR("Unrecognized option: -%c\n",
optopt);
else
ERROR("Unrecognized option\n");
errorcnt++;
break;
case ':':
ERROR("Missing argument to -%c\n", optopt);
errorcnt++;
break;
default:
FATAL("Unrecognized getopt output: %d\n", i);
}
}
if (errorcnt) {
print_help(argc, argv);
return 1;
}
if (argc - optind < 2) {
ERROR("You must specify an input file"
" and at least one AREA:file argument\n");
print_help(argc, argv);
return 1;
}
const char *infile = argv[optind++];
/* okay, let's do it ... */
if (!outfile)
outfile = (char *)infile;
else
if (futil_copy_file(infile, outfile) < 0)
exit(1);
int fd;
uint8_t *buf;
uint32_t len;
errorcnt |= futil_open_and_map_file(outfile, &fd, FILE_RW, &buf, &len);
if (errorcnt)
goto done;
FmapHeader *fmap = fmap_find(buf, len);
if (!fmap) {
ERROR("Can't find an FMAP in %s\n", infile);
errorcnt++;
goto done;
}
for (i = optind; i < argc; i++) {
char *a = argv[i];
char *f = strchr(a, ':');
if (!f || a == f || *(f+1) == '\0') {
ERROR("argument \"%s\" is bogus\n", a);
errorcnt++;
break;
}
*f++ = '\0';
FmapAreaHeader *ah;
uint8_t *area_buf = fmap_find_by_name(buf, len, fmap, a, &ah);
if (!area_buf) {
ERROR("Can't find area \"%s\" in FMAP\n", a);
errorcnt++;
break;
}
if (copy_to_area(f, area_buf, ah->area_size, a)) {
errorcnt++;
break;
}
}
done:
errorcnt |= futil_unmap_and_close_file(fd, FILE_RW, buf, len);
return !!errorcnt;
}
DECLARE_FUTIL_COMMAND(load_fmap, do_load_fmap, VBOOT_VERSION_ALL,
"Replace the contents of specified FMAP areas");
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