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-rw-r--r--src/dissect/dissect.c282
1 files changed, 282 insertions, 0 deletions
diff --git a/src/dissect/dissect.c b/src/dissect/dissect.c
new file mode 100644
index 0000000..50de0af
--- /dev/null
+++ b/src/dissect/dissect.c
@@ -0,0 +1,282 @@
+/* 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 "main-func.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_DESTRUCTOR_REGISTER(arg_root_hash, freep);
+
+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
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Unknown --discard= parameter: %s",
+ optarg);
+ 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': %m", 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)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Expected a file path as only argument.");
+
+ arg_image = argv[optind];
+ arg_flags |= DISSECT_IMAGE_READ_ONLY;
+ break;
+
+ case ACTION_MOUNT:
+ if (optind + 2 != argc)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Expected a file path and mount point path as only arguments.");
+
+ arg_image = argv[optind];
+ arg_path = argv[optind + 1];
+ break;
+
+ default:
+ assert_not_reached("Unknown action.");
+ }
+
+ return 1;
+}
+
+static int run(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)
+ return r;
+
+ r = loop_device_make_by_path(arg_image, (arg_flags & DISSECT_IMAGE_READ_ONLY) ? O_RDONLY : O_RDWR, &d);
+ if (r < 0)
+ return log_error_errno(r, "Failed to set up loopback device: %m");
+
+ if (!arg_root_hash) {
+ r = root_hash_load(arg_image, &arg_root_hash, &arg_root_hash_size);
+ if (r < 0)
+ return log_error_errno(r, "Failed to read root hash file for %s: %m", arg_image);
+ }
+
+ r = dissect_image_and_warn(d->fd, arg_image, arg_root_hash, arg_root_hash_size, arg_flags, &m);
+ if (r < 0)
+ return r;
+
+ 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)
+ return log_error_errno(r, "Failed to acquire image metadata: %m");
+
+ 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)
+ return r;
+
+ r = dissected_image_mount(m, arg_path, UID_INVALID, arg_flags);
+ if (r < 0)
+ return log_error_errno(r, "Failed to mount image: %m");
+
+ if (di) {
+ r = decrypted_image_relinquish(di);
+ if (r < 0)
+ return log_error_errno(r, "Failed to relinquish DM devices: %m");
+ }
+
+ loop_device_relinquish(d);
+ break;
+
+ default:
+ assert_not_reached("Unknown action.");
+ }
+
+ return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 17:17:54 +0000