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Systemd/src/dissect/dissect.c
Lennart Poettering 0c69794138 tree-wide: remove Lennart's copyright lines 
These lines are generally out-of-date, incomplete and unnecessary. With
SPDX and git repository much more accurate and fine grained information
about licensing and authorship is available, hence let's drop the
per-file copyright notice. Of course, removing copyright lines of others
is problematic, hence this commit only removes my own lines and leaves
all others untouched. It might be nicer if sooner or later those could
go away too, making git the only and accurate source of authorship
information.
2018-06-14 10:20:20 +02:00

292 lines
9.8 KiB
C
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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <fcntl.h>
#include <stdio.h>
#include <getopt.h>
#include "architecture.h"
#include "dissect-image.h"
#include "hexdecoct.h"
#include "log.h"
#include "loop-util.h"
#include "string-util.h"
#include "strv.h"
#include "user-util.h"
#include "util.h"
static enum {
ACTION_DISSECT,
ACTION_MOUNT,
} arg_action = ACTION_DISSECT;
static const char *arg_image = NULL;
static const char *arg_path = NULL;
static DissectImageFlags arg_flags = DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_DISCARD_ON_LOOP;
static void *arg_root_hash = NULL;
static size_t arg_root_hash_size = 0;
static void help(void) {
printf("%s [OPTIONS...] IMAGE\n"
"%s [OPTIONS...] --mount IMAGE PATH\n"
"Dissect a file system OS image.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -m --mount Mount the image to the specified directory\n"
" -r --read-only Mount read-only\n"
" --discard=MODE Choose 'discard' mode (disabled, loop, all, crypto)\n"
" --root-hash=HASH Specify root hash for verity\n",
program_invocation_short_name,
program_invocation_short_name);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_DISCARD,
ARG_ROOT_HASH,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "mount", no_argument, NULL, 'm' },
{ "read-only", no_argument, NULL, 'r' },
{ "discard", required_argument, NULL, ARG_DISCARD },
{ "root-hash", required_argument, NULL, ARG_ROOT_HASH },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hmr", options, NULL)) >= 0) {
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
return version();
case 'm':
arg_action = ACTION_MOUNT;
break;
case 'r':
arg_flags |= DISSECT_IMAGE_READ_ONLY;
break;
case ARG_DISCARD: {
DissectImageFlags flags;
if (streq(optarg, "disabled"))
flags = 0;
else if (streq(optarg, "loop"))
flags = DISSECT_IMAGE_DISCARD_ON_LOOP;
else if (streq(optarg, "all"))
flags = DISSECT_IMAGE_DISCARD_ON_LOOP | DISSECT_IMAGE_DISCARD;
else if (streq(optarg, "crypt"))
flags = DISSECT_IMAGE_DISCARD_ANY;
else {
log_error("Unknown --discard= parameter: %s", optarg);
return -EINVAL;
}
arg_flags = (arg_flags & ~DISSECT_IMAGE_DISCARD_ANY) | flags;
break;
}
case ARG_ROOT_HASH: {
void *p;
size_t l;
r = unhexmem(optarg, strlen(optarg), &p, &l);
if (r < 0)
return log_error_errno(r, "Failed to parse root hash: %s", optarg);
if (l < sizeof(sd_id128_t)) {
log_error("Root hash must be at least 128bit long: %s", optarg);
free(p);
return -EINVAL;
}
free(arg_root_hash);
arg_root_hash = p;
arg_root_hash_size = l;
break;
}
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
}
switch (arg_action) {
case ACTION_DISSECT:
if (optind + 1 != argc) {
log_error("Expected a file path as only argument.");
return -EINVAL;
}
arg_image = argv[optind];
arg_flags |= DISSECT_IMAGE_READ_ONLY;
break;
case ACTION_MOUNT:
if (optind + 2 != argc) {
log_error("Expected a file path and mount point path as only arguments.");
return -EINVAL;
}
arg_image = argv[optind];
arg_path = argv[optind + 1];
break;
default:
assert_not_reached("Unknown action.");
}
return 1;
}
int main(int argc, char *argv[]) {
_cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
_cleanup_(decrypted_image_unrefp) DecryptedImage *di = NULL;
_cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
int r;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
r = loop_device_make_by_path(arg_image, (arg_flags & DISSECT_IMAGE_READ_ONLY) ? O_RDONLY : O_RDWR, &d);
if (r < 0) {
log_error_errno(r, "Failed to set up loopback device: %m");
goto finish;
}
if (!arg_root_hash) {
r = root_hash_load(arg_image, &arg_root_hash, &arg_root_hash_size);
if (r < 0) {
log_error_errno(r, "Failed to read root hash file for %s: %m", arg_image);
goto finish;
}
}
r = dissect_image_and_warn(d->fd, arg_image, arg_root_hash, arg_root_hash_size, arg_flags, &m);
if (r < 0)
goto finish;
switch (arg_action) {
case ACTION_DISSECT: {
unsigned i;
for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
DissectedPartition *p = m->partitions + i;
int k;
if (!p->found)
continue;
printf("Found %s '%s' partition",
p->rw ? "writable" : "read-only",
partition_designator_to_string(i));
if (!sd_id128_is_null(p->uuid))
printf(" (UUID " SD_ID128_FORMAT_STR ")", SD_ID128_FORMAT_VAL(p->uuid));
if (p->fstype)
printf(" of type %s", p->fstype);
if (p->architecture != _ARCHITECTURE_INVALID)
printf(" for %s", architecture_to_string(p->architecture));
k = PARTITION_VERITY_OF(i);
if (k >= 0)
printf(" %s verity", m->partitions[k].found ? "with" : "without");
if (p->partno >= 0)
printf(" on partition #%i", p->partno);
if (p->node)
printf(" (%s)", p->node);
putchar('\n');
}
r = dissected_image_acquire_metadata(m);
if (r < 0) {
log_error_errno(r, "Failed to acquire image metadata: %m");
goto finish;
}
if (m->hostname)
printf(" Hostname: %s\n", m->hostname);
if (!sd_id128_is_null(m->machine_id))
printf("Machine ID: " SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->machine_id));
if (!strv_isempty(m->machine_info)) {
char **p, **q;
STRV_FOREACH_PAIR(p, q, m->machine_info)
printf("%s %s=%s\n",
p == m->machine_info ? "Mach. Info:" : " ",
*p, *q);
}
if (!strv_isempty(m->os_release)) {
char **p, **q;
STRV_FOREACH_PAIR(p, q, m->os_release)
printf("%s %s=%s\n",
p == m->os_release ? "OS Release:" : " ",
*p, *q);
}
break;
}
case ACTION_MOUNT:
r = dissected_image_decrypt_interactively(m, NULL, arg_root_hash, arg_root_hash_size, arg_flags, &di);
if (r < 0)
goto finish;
r = dissected_image_mount(m, arg_path, UID_INVALID, arg_flags);
if (r < 0) {
log_error_errno(r, "Failed to mount image: %m");
goto finish;
}
if (di) {
r = decrypted_image_relinquish(di);
if (r < 0) {
log_error_errno(r, "Failed to relinquish DM devices: %m");
goto finish;
}
}
loop_device_relinquish(d);
break;
default:
assert_not_reached("Unknown action.");
}
finish:
free(arg_root_hash);
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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