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// SPDX-License-Identifier: BSD-3-Clause
#include "config.h"
#include "id.h"
#include "random-seed.h"
#include "sha2.h"
#include "util.h"
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/vfs.h>
#include <unistd.h>
#ifdef HAVE_LIBUDEV
#include <libudev.h>
#endif
#ifdef HAVE_UTIL_LINUX
#include <blkid.h>
#include <libmount.h>
#endif
static const char *MACHINE_ID_PATHS[] = THE_MACHINE_ID_PATHS;
bool ensure_rs_device(struct random_seed *rs, int fd) {
assert(!major(rs->dev));
struct stat statbuf;
if (fstat(fd, &statbuf) == -1) {
perror("warning: failed getting seed device");
return false;
}
memcpy(&rs->dev, &statbuf.st_dev, sizeof(dev_t));
return true;
}
#ifdef HAVE_LIBUDEV
static struct udev *udev;
bool ensure_udev_device(struct random_seed *rs) {
if (!udev)
udev = udev_new();
if (!udev) {
fputs("error initializing libudev\n", stderr);
return false;
}
if (!major(rs->dev)) {
assert(rs->file);
if (!ensure_rs_device(rs, fileno(rs->file)))
return false;
}
if (!rs->udev_dev)
rs->udev_dev = udev_device_new_from_devnum(udev, 'b', rs->dev);
return !!rs->udev_dev;
}
const char *get_fs_uuid_udev(struct random_seed *rs) {
if (!ensure_udev_device(rs))
return NULL;
return udev_device_get_property_value(rs->udev_dev, "ID_FS_UUID_ENC");
}
const char *get_drive_id(struct random_seed *rs) {
if (!ensure_udev_device(rs))
return NULL;
return udev_device_get_property_value(rs->udev_dev, "ID_SERIAL");
}
#endif
#ifdef HAVE_UTIL_LINUX
const char *get_fs_uuid_util_linux(struct random_seed *rs) {
(void)rs;
fputs("error: util linux not implemented\n", stderr);
return NULL;
}
#endif
#if defined(HAVE_LIBUDEV) && defined(HAVE_UTIL_LINUX)
const char *get_fs_uuid(struct random_seed *rs) {
const char *rv = get_fs_uuid_udev(rs);
if (!rv)
rv = get_fs_uuid_util_linux(rs);
return rv;
}
#elif defined(HAVE_LIBUDEV)
const char *get_fs_uuid(struct random_seed *rs) {
return get_fs_uuid_udev(rs);
}
#elif defined(HAVE_UTIL_LINUX)
const char *get_fs_uuid(struct random_seed *rs) {
return get_fs_uuid_util_linux(rs);
}
#endif
static char *really_get_machine_id() {
FILE *machine_id_file;
for (size_t i = 0; i < ARRAY_SIZE(MACHINE_ID_PATHS); i++) {
machine_id_file = fopen(MACHINE_ID_PATHS[i], "r");
if (!machine_id_file)
fprintf(stderr, "warning: failed to open machine id %s: %s\n", MACHINE_ID_PATHS[i], strerror(errno));
}
if (!machine_id_file) {
fputs("error: failed to open all machine id files\n", stderr);
return NULL;
}
char *machine_id = NULL;
size_t machine_id_len = 0;
if (getdelim(&machine_id, &machine_id_len, '\0', machine_id_file) == -1) {
fputs("error reading machine id file\n", stderr);
free(machine_id);
return NULL;
}
return machine_id;
}
const char *get_machine_id() {
static char *c_machine_id;
if (!c_machine_id)
c_machine_id = really_get_machine_id();
return c_machine_id;
}
bool get_fs_id(fsid_t *fs_id, int seed_fd) {
struct statfs statfs_buf;
if (fstatfs(seed_fd, &statfs_buf) == -1) {
perror("error: statfs seed file: %s");
return false;
}
switch (statfs_buf.f_type) {
case 0x9123683e: // BTRFS_SUPER_MAGIC
case 0xef53: // EXT2_SUPER_MAGIC == EXT3_SUPER_MAGIC == EXT4_SUPER_MAGIC
case 0x3153464a: // JFS_SUPER_MAGIC
case 0x5346544e: // NTFS_SB_MAGIC
case 0x52654973: // REISERFS_SUPER_MAGIC
case 0x24051905: // UBIFS_SUPER_MAGIC
memcpy(fs_id, &statfs_buf.f_fsid, sizeof(fsid_t));
return true;
default:
fprintf(stderr, "error: filesystem type 0x%08x does not have consistent f_fsid\n", (unsigned int)statfs_buf.f_type);
return false;
}
}
void hash(const unsigned char salt[static SALT_LEN], unsigned char out[static HASH_LEN], const void *in, size_t size) {
assert(size < INT_MAX - SALT_LEN - 100);
sha256_ctx ctx;
sha256_init(&ctx);
sha256_update(&ctx, salt, SALT_LEN);
sha256_update(&ctx, in, (unsigned int)size);
sha256_final(&ctx, out);
}
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