2 * plausible.c --- Figure out if a pathname is ext* or something else.
4 * Copyright 2014, Oracle, Inc.
7 * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
10 * This file may be redistributed under the terms of the GNU Public
15 #ifndef _LARGEFILE_SOURCE
16 #define _LARGEFILE_SOURCE
18 #ifndef _LARGEFILE64_SOURCE
19 #define _LARGEFILE64_SOURCE
25 #include <sys/types.h>
26 #ifdef HAVE_SYS_STAT_H
35 #include "plausible.h"
36 #include "ext2fs/ext2fs.h"
37 #include "nls-enable.h"
38 #include "blkid/blkid.h"
41 static magic_t (*dl_magic_open)(int);
42 static const char *(*dl_magic_file)(magic_t, const char *);
43 static int (*dl_magic_load)(magic_t, const char *);
44 static void (*dl_magic_close)(magic_t);
47 * NO_CHECK functionality was only added in file 4.20.
48 * Older systems like RHEL 5.x still have file 4.17
50 #ifndef MAGIC_NO_CHECK_COMPRESS
51 #define MAGIC_NO_CHECK_COMPRESS 0x0001000
53 #ifndef MAGIC_NO_CHECK_ELF
54 #define MAGIC_NO_CHECK_ELF 0x0010000
60 static void *magic_handle;
62 static int magic_library_available(void)
65 magic_handle = dlopen("libmagic.so.1", RTLD_NOW);
69 dl_magic_open = (magic_t (*)(int))
70 dlsym(magic_handle, "magic_open");
71 dl_magic_file = (const char *(*)(magic_t, const char *))
72 dlsym(magic_handle, "magic_file");
73 dl_magic_load = (int (*)(magic_t, const char *))
74 dlsym(magic_handle, "magic_load");
75 dl_magic_close = (void (*)(magic_t))
76 dlsym(magic_handle, "magic_close");
79 if (!dl_magic_open || !dl_magic_file ||
80 !dl_magic_load || !dl_magic_close)
85 static int magic_library_available(void)
87 dl_magic_open = magic_open;
88 dl_magic_file = magic_file;
89 dl_magic_load = magic_load;
90 dl_magic_close = magic_close;
97 static void print_ext2_info(const char *device)
100 struct ext2_super_block *sb;
105 retval = ext2fs_open2(device, 0, EXT2_FLAG_64BITS, 0, 0,
118 if (sb->s_last_mounted[0])
119 printf(_("\tlast mounted on %.*s on %s"),
120 EXT2_LEN_STR(sb->s_last_mounted), ctime(&tm));
122 printf(_("\tlast mounted on %s"), ctime(&tm));
123 } else if (sb->s_mkfs_time) {
124 tm = sb->s_mkfs_time;
125 printf(_("\tcreated on %s"), ctime(&tm));
126 } else if (sb->s_wtime) {
128 printf(_("\tlast modified on %s"), ctime(&tm));
130 ext2fs_close_free(&fs);
134 * return 1 if there is no partition table, 0 if a partition table is
135 * detected, and -1 on an error.
137 #ifdef HAVE_BLKID_PROBE_ENABLE_PARTITIONS
138 static int check_partition_table(const char *device)
144 pr = blkid_new_probe_from_filename(device);
148 ret = blkid_probe_enable_partitions(pr, 1);
152 ret = blkid_probe_enable_superblocks(pr, 0);
156 ret = blkid_do_fullprobe(pr);
160 ret = blkid_probe_lookup_value(pr, "PTTYPE", &value, NULL);
162 fprintf(stderr, _("Found a %s partition table in %s\n"),
168 blkid_free_probe(pr);
172 static int check_partition_table(const char *device EXT2FS_ATTR((unused)))
179 * return 1 if the device looks plausible, creating the file if necessary
181 int check_plausibility(const char *device, int flags, int *ret_is_dev)
183 int fd, ret, is_dev = 0;
184 ext2fs_struct_stat s;
186 blkid_cache cache = NULL;
187 char *fs_type = NULL;
188 char *fs_label = NULL;
190 fd = ext2fs_open_file(device, fl, 0666);
191 if ((fd < 0) && (errno == ENOENT) && (flags & NO_SIZE)) {
192 fprintf(stderr, _("The file %s does not exist and no "
193 "size was specified.\n"), device);
196 if ((fd < 0) && (errno == ENOENT) && (flags & CREATE_FILE)) {
198 fd = ext2fs_open_file(device, fl, 0666);
199 if (fd >= 0 && (flags & VERBOSE_CREATE))
200 printf(_("Creating regular file %s\n"), device);
203 fprintf(stderr, _("Could not open %s: %s\n"),
204 device, error_message(errno));
206 fputs(_("\nThe device apparently does not exist; "
207 "did you specify it correctly?\n"), stderr);
211 if (ext2fs_fstat(fd, &s) < 0) {
217 if (S_ISBLK(s.st_mode))
219 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
220 /* On FreeBSD, all disk devices are character specials */
221 if (S_ISCHR(s.st_mode))
225 *ret_is_dev = is_dev;
227 if ((flags & CHECK_BLOCK_DEV) && !is_dev) {
228 printf(_("%s is not a block special device.\n"), device);
233 * Note: we use the older-style blkid API's here because we
234 * want as much functionality to be available when using the
235 * internal blkid library, when e2fsprogs is compiled for
236 * non-Linux systems that will probably not have the libraries
237 * from util-linux available. We only use the newer
238 * blkid-probe interfaces to access functionality not
239 * available in the original blkid library.
241 if ((flags & CHECK_FS_EXIST) && blkid_get_cache(&cache, NULL) >= 0) {
242 fs_type = blkid_get_tag_value(cache, "TYPE", device);
244 fs_label = blkid_get_tag_value(cache, "LABEL", device);
245 blkid_put_cache(cache);
250 printf(_("%s contains a %s file system labelled '%s'\n"),
251 device, fs_type, fs_label);
253 printf(_("%s contains a %s file system\n"), device,
255 if (strncmp(fs_type, "ext", 3) == 0)
256 print_ext2_info(device);
263 if ((flags & CHECK_FS_EXIST) &&
264 !getenv("E2FSPROGS_LIBMAGIC_SUPPRESS") &&
265 magic_library_available()) {
270 mag = dl_magic_open(MAGIC_RAW | MAGIC_SYMLINK | MAGIC_DEVICES |
271 MAGIC_ERROR | MAGIC_NO_CHECK_ELF |
272 MAGIC_NO_CHECK_COMPRESS);
273 dl_magic_load(mag, NULL);
275 msg = dl_magic_file(mag, device);
276 if (msg && strcmp(msg, "data") && strcmp(msg, "empty")) {
277 printf(_("%s contains `%s' data\n"), device, msg);
285 if (flags & CHECK_FS_EXIST) {
286 ret = check_partition_table(device);