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);
49 static void *magic_handle;
51 static int magic_library_available(void)
54 magic_handle = dlopen("libmagic.so.1", RTLD_NOW);
58 dl_magic_open = (magic_t (*)(int))
59 dlsym(magic_handle, "magic_open");
60 dl_magic_file = (const char *(*)(magic_t, const char *))
61 dlsym(magic_handle, "magic_file");
62 dl_magic_load = (int (*)(magic_t, const char *))
63 dlsym(magic_handle, "magic_load");
64 dl_magic_close = (void (*)(magic_t))
65 dlsym(magic_handle, "magic_close");
68 if (!dl_magic_open || !dl_magic_file ||
69 !dl_magic_load || !dl_magic_close)
74 static int magic_library_available(void)
76 dl_magic_open = magic_open;
77 dl_magic_file = magic_file;
78 dl_magic_load = magic_load;
79 dl_magic_close = magic_close;
86 static void print_ext2_info(const char *device)
89 struct ext2_super_block *sb;
95 retval = ext2fs_open2(device, 0, EXT2_FLAG_64BITS, 0, 0,
96 unix_io_manager, &fs);
103 if (sb->s_last_mounted[0]) {
104 memset(buf, 0, sizeof(buf));
105 strncpy(buf, sb->s_last_mounted,
106 sizeof(sb->s_last_mounted));
107 printf(_("\tlast mounted on %s on %s"), buf,
110 printf(_("\tlast mounted on %s"), ctime(&tm));
111 } else if (sb->s_mkfs_time) {
112 tm = sb->s_mkfs_time;
113 printf(_("\tcreated on %s"), ctime(&tm));
114 } else if (sb->s_wtime) {
116 printf(_("\tlast modified on %s"), ctime(&tm));
118 ext2fs_close_free(&fs);
122 * return 1 if there is no partition table, 0 if a partition table is
123 * detected, and -1 on an error.
125 #ifdef HAVE_BLKID_PROBE_ENABLE_PARTITIONS
126 static int check_partition_table(const char *device)
132 pr = blkid_new_probe_from_filename(device);
136 ret = blkid_probe_enable_partitions(pr, 1);
140 ret = blkid_probe_enable_superblocks(pr, 0);
144 ret = blkid_do_fullprobe(pr);
148 ret = blkid_probe_lookup_value(pr, "PTTYPE", &value, NULL);
150 fprintf(stderr, _("Found a %s partition table in %s\n"),
156 blkid_free_probe(pr);
160 static int check_partition_table(const char *device EXT2FS_ATTR((unused)))
167 * return 1 if the device looks plausible, creating the file if necessary
169 int check_plausibility(const char *device, int flags, int *ret_is_dev)
171 int fd, ret, is_dev = 0;
172 ext2fs_struct_stat s;
174 blkid_cache cache = NULL;
175 char *fs_type = NULL;
176 char *fs_label = NULL;
178 fd = ext2fs_open_file(device, fl, 0666);
179 if ((fd < 0) && (errno == ENOENT) && (flags & NO_SIZE)) {
180 fprintf(stderr, _("The file %s does not exist and no "
181 "size was specified.\n"), device);
184 if ((fd < 0) && (errno == ENOENT) && (flags & CREATE_FILE)) {
186 fd = ext2fs_open_file(device, fl, 0666);
187 if (fd >= 0 && (flags & VERBOSE_CREATE))
188 printf(_("Creating regular file %s\n"), device);
191 fprintf(stderr, _("Could not open %s: %s\n"),
192 device, error_message(errno));
194 fputs(_("\nThe device apparently does not exist; "
195 "did you specify it correctly?\n"), stderr);
199 if (ext2fs_fstat(fd, &s) < 0) {
205 if (S_ISBLK(s.st_mode))
207 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
208 /* On FreeBSD, all disk devices are character specials */
209 if (S_ISCHR(s.st_mode))
213 *ret_is_dev = is_dev;
215 if ((flags & CHECK_BLOCK_DEV) && !is_dev) {
216 printf(_("%s is not a block special device.\n"), device);
221 * Note: we use the older-style blkid API's here because we
222 * want as much functionality to be available when using the
223 * internal blkid library, when e2fsprogs is compiled for
224 * non-Linux systems that will probably not have the libraries
225 * from util-linux available. We only use the newer
226 * blkid-probe interfaces to access functionality not
227 * available in the original blkid library.
229 if ((flags & CHECK_FS_EXIST) && blkid_get_cache(&cache, NULL) >= 0) {
230 fs_type = blkid_get_tag_value(cache, "TYPE", device);
232 fs_label = blkid_get_tag_value(cache, "LABEL", device);
233 blkid_put_cache(cache);
238 printf(_("%s contains a %s file system "
239 "labelled '%s'\n"), device, fs_type, fs_label);
241 printf(_("%s contains a %s file system\n"), device,
243 if (strncmp(fs_type, "ext", 3) == 0)
244 print_ext2_info(device);
251 if ((flags & CHECK_FS_EXIST) &&
252 !getenv("E2FSPROGS_LIBMAGIC_SUPPRESS") &&
253 magic_library_available()) {
258 mag = dl_magic_open(MAGIC_RAW | MAGIC_SYMLINK | MAGIC_DEVICES |
259 MAGIC_ERROR | MAGIC_NO_CHECK_ELF |
260 MAGIC_NO_CHECK_COMPRESS);
261 dl_magic_load(mag, NULL);
263 msg = dl_magic_file(mag, device);
264 if (msg && strcmp(msg, "data") && strcmp(msg, "empty")) {
265 printf(_("%s contains `%s' data\n"), device, msg);
274 ret = check_partition_table(device);