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1 /*
2  * set_fields.c --- set a superblock value
3  *
4  * Copyright (C) 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o.
5  *
6  * %Begin-Header%
7  * This file may be redistributed under the terms of the GNU Public
8  * License.
9  * %End-Header%
10  */
11 
12 #define _XOPEN_SOURCE 600 /* for inclusion of strptime() and strtoull */
13 
14 #ifdef HAVE_STRTOULL
15 #define STRTOULL strtoull
16 #else
17 #define STRTOULL strtoul
18 #endif
19 
20 #include "config.h"
21 #include <stdio.h>
22 #include <unistd.h>
23 #include <stdlib.h>
24 #include <ctype.h>
25 #include <string.h>
26 #include <strings.h>
27 #include <time.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #ifdef HAVE_ERRNO_H
31 #include <errno.h>
32 #endif
33 #include <assert.h>
34 #if HAVE_STRINGS_H
35 #include <strings.h>
36 #endif
37 #include <fcntl.h>
38 #include <utime.h>
39 
40 #include "debugfs.h"
41 #include "uuid/uuid.h"
42 #include "e2p/e2p.h"
43 #include "support/quotaio.h"
44 
45 static struct ext2_super_block set_sb;
46 static struct ext2_inode_large set_inode;
47 static struct ext2_group_desc set_gd;
48 static struct ext4_group_desc set_gd4;
49 static struct mmp_struct set_mmp;
50 static dgrp_t set_bg;
51 static ext2_ino_t set_ino;
52 static int array_idx;
53 
54 #define FLAG_ARRAY	0x0001
55 #define FLAG_ALIAS	0x0002	/* Data intersects with other field */
56 
57 struct field_set_info {
58 	const char	*name;
59 	void	*ptr;
60 	void	*ptr2;
61 	unsigned int	size;
62 	errcode_t (*func)(struct field_set_info *info, char *field, char *arg);
63 	int flags;
64 	int max_idx;
65 };
66 
67 static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg);
68 static errcode_t parse_int(struct field_set_info *info, char *field, char *arg);
69 static errcode_t parse_string(struct field_set_info *info, char *field, char *arg);
70 static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg);
71 static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg);
72 static errcode_t parse_time(struct field_set_info *info, char *field, char *arg);
73 static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg);
74 static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg);
75 static errcode_t parse_mmp_clear(struct field_set_info *info, char *field,
76 				 char *arg);
77 
78 #if __GNUC_PREREQ (4, 6) || defined(__clang__)
79 #pragma GCC diagnostic push
80 #pragma GCC diagnostic ignored "-Wmissing-field-initializers"
81 #endif
82 
83 static struct field_set_info super_fields[] = {
84 	{ "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
85 	{ "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi,
86 		4, parse_uint },
87 	{ "r_blocks_count", &set_sb.s_r_blocks_count,
88 		&set_sb.s_r_blocks_count_hi, 4, parse_uint },
89 	{ "free_blocks_count", &set_sb.s_free_blocks_count,
90 		&set_sb.s_free_blocks_hi, 4, parse_uint },
91 	{ "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint },
92 	{ "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint },
93 	{ "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint },
94 	{ "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int },
95 	{ "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint },
96 	{ "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint },
97 	{ "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint },
98 	{ "mtime", &set_sb.s_mtime, NULL, 4, parse_time },
99 	{ "wtime", &set_sb.s_wtime, NULL, 4, parse_time },
100 	{ "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint },
101 	{ "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int },
102 	/* s_magic */
103 	{ "state", &set_sb.s_state, NULL, 2, parse_uint },
104 	{ "errors", &set_sb.s_errors, NULL, 2, parse_uint },
105 	{ "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint },
106 	{ "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time },
107 	{ "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint },
108 	{ "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint },
109 	{ "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint },
110 	{ "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint },
111 	{ "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint },
112 	{ "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint },
113 	{ "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint },
114 	{ "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint },
115 	{ "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint },
116 	{ "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint },
117 	{ "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint },
118 	{ "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid },
119 	{ "volume_name",  &set_sb.s_volume_name, NULL, 16, parse_string },
120 	{ "last_mounted",  &set_sb.s_last_mounted, NULL, 64, parse_string },
121 	{ "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL,
122 		  4, parse_uint },
123 	{ "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint },
124 	{ "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1,
125 		  parse_uint },
126 	{ "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2,
127 		  parse_uint },
128 	{ "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid },
129 	{ "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint },
130 	{ "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint },
131 	{ "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint },
132 	{ "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid },
133 	{ "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg },
134 	{ "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint },
135 	{ "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint },
136 	{ "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint },
137 	{ "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint },
138 	{ "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time },
139 	{ "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY,
140 	  17 },
141 	{ "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint },
142 	{ "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint },
143 	{ "flags", &set_sb.s_flags, NULL, 4, parse_uint },
144 	{ "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint },
145 	{ "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint },
146 	{ "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint },
147 	{ "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint },
148 	{ "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint },
149 	{ "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint },
150 	{ "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint },
151 	{ "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint },
152 	{ "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count,
153 	  NULL, 8, parse_uint },
154 	{ "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint },
155 	{ "mount_opts",  &set_sb.s_mount_opts, NULL, 64, parse_string },
156 	{ "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint },
157 	{ "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint },
158 	{ "prj_quota_inum", &set_sb.s_prj_quota_inum, NULL, 4, parse_uint },
159 	{ "overhead_blocks", &set_sb.s_overhead_blocks, NULL, 4, parse_uint },
160 	{ "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint,
161 	  FLAG_ARRAY, 2 },
162 	{ "checksum", &set_sb.s_checksum, NULL, 4, parse_uint },
163 	{ "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint },
164 	{ "encryption_level", &set_sb.s_encryption_level, NULL, 1, parse_uint },
165 	{ "error_count", &set_sb.s_error_count, NULL, 4, parse_uint },
166 	{ "first_error_time", &set_sb.s_first_error_time, NULL, 4, parse_time },
167 	{ "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint },
168 	{ "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint },
169 	{ "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string },
170 	{ "first_error_line", &set_sb.s_first_error_line, NULL, 4, parse_uint },
171 	{ "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time },
172 	{ "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint },
173 	{ "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint },
174 	{ "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string },
175 	{ "last_error_line", &set_sb.s_last_error_line, NULL, 4, parse_uint },
176 	{ "encrypt_algos", &set_sb.s_encrypt_algos, NULL, 1, parse_uint,
177 	  FLAG_ARRAY, 4 },
178 	{ "encrypt_pw_salt", &set_sb.s_encrypt_pw_salt, NULL, 16, parse_uuid },
179 	{ "lpf_ino", &set_sb.s_lpf_ino, NULL, 4, parse_uint },
180 	{ "checksum_seed", &set_sb.s_checksum_seed, NULL, 4, parse_uint },
181 	{ 0, 0, 0, 0 }
182 };
183 
184 static struct field_set_info inode_fields[] = {
185 	{ "mode", &set_inode.i_mode, NULL, 2, parse_uint },
186 	{ "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
187 		2, parse_uint },
188 	{ "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint },
189 	{ "atime", &set_inode.i_atime, &set_inode.i_atime_extra,
190 		4, parse_time },
191 	{ "ctime", &set_inode.i_ctime, &set_inode.i_ctime_extra,
192 		4, parse_time },
193 	{ "mtime", &set_inode.i_mtime, &set_inode.i_mtime_extra,
194 		4, parse_time },
195 	{ "dtime", &set_inode.i_dtime, NULL,
196 		4, parse_time },
197 	{ "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high,
198 		2, parse_uint },
199 	{ "links_count", &set_inode.i_links_count, NULL, 2, parse_uint },
200 	/* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */
201 	{ "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi,
202 		6, parse_uint },
203 	{ "flags", &set_inode.i_flags, NULL, 4, parse_uint },
204 	{ "version", &set_inode.osd1.linux1.l_i_version,
205 		&set_inode.i_version_hi, 4, parse_uint },
206 	{ "translator", &set_inode.osd1.hurd1.h_i_translator, NULL,
207 		4, parse_uint, FLAG_ALIAS },
208 	{ "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
209 	  EXT2_NDIR_BLOCKS },
210 	{ "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
211 	{ "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint },
212 	{ "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint },
213 	{ "generation", &set_inode.i_generation, NULL, 4, parse_uint },
214 	/* Special case: i_file_acl_high is 2 bytes */
215 	{ "file_acl", &set_inode.i_file_acl,
216 		&set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
217 	{ "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
218 	{ "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint, FLAG_ALIAS },
219 	{ "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
220 	{ "checksum", &set_inode.osd2.linux2.l_i_checksum_lo,
221 		&set_inode.i_checksum_hi, 2, parse_uint },
222 	{ "author", &set_inode.osd2.hurd2.h_i_author, NULL,
223 		4, parse_uint, FLAG_ALIAS },
224 	{ "extra_isize", &set_inode.i_extra_isize, NULL,
225 		2, parse_uint },
226 	{ "ctime_extra", &set_inode.i_ctime_extra, NULL,
227 		4, parse_uint, FLAG_ALIAS },
228 	{ "mtime_extra", &set_inode.i_mtime_extra, NULL,
229 		4, parse_uint, FLAG_ALIAS  },
230 	{ "atime_extra", &set_inode.i_atime_extra, NULL,
231 		4, parse_uint, FLAG_ALIAS },
232 	{ "crtime", &set_inode.i_crtime, &set_inode.i_crtime_extra,
233 		4, parse_time },
234 	{ "crtime_extra", &set_inode.i_crtime_extra, NULL,
235 		4, parse_uint, FLAG_ALIAS },
236 	{ "projid", &set_inode.i_projid, NULL, 4, parse_uint },
237 	{ "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY },
238 	{ 0, 0, 0, 0 }
239 };
240 
241 static struct field_set_info ext2_bg_fields[] = {
242 	{ "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint },
243 	{ "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint },
244 	{ "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint },
245 	{ "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint },
246 	{ "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint },
247 	{ "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint },
248 	{ "flags", &set_gd.bg_flags, NULL, 2, parse_uint },
249 	{ "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint },
250 	{ "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum },
251 	{ 0, 0, 0, 0 }
252 };
253 
254 static struct field_set_info ext4_bg_fields[] = {
255 	{ "block_bitmap", &set_gd4.bg_block_bitmap,
256 		&set_gd4.bg_block_bitmap_hi, 4, parse_uint },
257 	{ "inode_bitmap", &set_gd4.bg_inode_bitmap,
258 		&set_gd4.bg_inode_bitmap_hi, 4, parse_uint },
259 	{ "inode_table", &set_gd4.bg_inode_table,
260 		&set_gd4.bg_inode_table_hi, 4, parse_uint },
261 	{ "free_blocks_count", &set_gd4.bg_free_blocks_count,
262 		&set_gd4.bg_free_blocks_count_hi, 2, parse_uint },
263 	{ "free_inodes_count", &set_gd4.bg_free_inodes_count,
264 		&set_gd4.bg_free_inodes_count_hi, 2, parse_uint },
265 	{ "used_dirs_count", &set_gd4.bg_used_dirs_count,
266 		&set_gd4.bg_used_dirs_count_hi, 2, parse_uint },
267 	{ "flags", &set_gd4.bg_flags, NULL, 2, parse_uint },
268 	{ "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo,
269 		&set_gd4.bg_exclude_bitmap_hi, 4, parse_uint },
270 	{ "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo,
271 		&set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint },
272 	{ "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo,
273 		&set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint },
274 	{ "itable_unused", &set_gd4.bg_itable_unused,
275 		&set_gd4.bg_itable_unused_hi, 2, parse_uint },
276 	{ "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum },
277 	{ 0, 0, 0, 0 }
278 };
279 
280 static struct field_set_info mmp_fields[] = {
281 	{ "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp),
282 		parse_mmp_clear, FLAG_ALIAS },
283 	{ "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
284 	{ "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
285 	{ "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
286 	{ "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename),
287 		parse_string },
288 	{ "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname),
289 		parse_string },
290 	{ "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
291 	{ "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint },
292 	{ 0, 0, 0, 0 }
293 };
294 #if __GNUC_PREREQ (4, 6)
295 #pragma GCC diagnostic pop
296 #endif
297 
298 #ifdef UNITTEST
299 
300 
do_verify_field_set_info(struct field_set_info * fields,const void * data,size_t size)301 static void do_verify_field_set_info(struct field_set_info *fields,
302 		const void *data, size_t size)
303 {
304 	struct field_set_info *ss, *ss2;
305 	const char *begin = (char *)data;
306 	const char *end = begin + size;
307 
308 	for (ss = fields ; ss->name ; ss++) {
309 		const char *ptr;
310 
311 		/* Check pointers */
312 		ptr = ss->ptr;
313 		assert(!ptr || (ptr >= begin && ptr < end));
314 		ptr = ss->ptr2;
315 		assert(!ptr || (ptr >= begin && ptr < end));
316 
317 		/* Check function */
318 		assert(ss->func);
319 
320 		for (ss2 = fields ; ss2 != ss ; ss2++) {
321 			/* Check duplicate names */
322 			assert(strcmp(ss->name, ss2->name));
323 
324 			if (ss->flags & FLAG_ALIAS || ss2->flags & FLAG_ALIAS)
325 				continue;
326 			/* Check false aliases, might be copy-n-paste error */
327 			assert(!ss->ptr || (ss->ptr != ss2->ptr &&
328 					    ss->ptr != ss2->ptr2));
329 			assert(!ss->ptr2 || (ss->ptr2 != ss2->ptr &&
330 					     ss->ptr2 != ss2->ptr2));
331 		}
332 	}
333 }
334 
main(int argc,char ** argv)335 int main(int argc, char **argv)
336 {
337 	do_verify_field_set_info(super_fields, &set_sb, sizeof(set_sb));
338 	do_verify_field_set_info(inode_fields, &set_inode, sizeof(set_inode));
339 	do_verify_field_set_info(ext2_bg_fields, &set_gd, sizeof(set_gd));
340 	do_verify_field_set_info(ext4_bg_fields, &set_gd4, sizeof(set_gd4));
341 	do_verify_field_set_info(mmp_fields, &set_mmp, sizeof(set_mmp));
342 	return 0;
343 }
344 
345 ext2_filsys current_fs;
346 ext2_ino_t root, cwd;
347 
348 #endif /* UNITTEST */
349 
check_suffix(const char * field)350 static int check_suffix(const char *field)
351 {
352 	int len = strlen(field);
353 
354 	if (len <= 3)
355 		return 0;
356 	field += len-3;
357 	if (!strcmp(field, "_lo"))
358 		return 1;
359 	if (!strcmp(field, "_hi"))
360 		return 2;
361 	return 0;
362 }
363 
find_field(struct field_set_info * fields,char * field)364 static struct field_set_info *find_field(struct field_set_info *fields,
365 					 char *field)
366 {
367 	struct field_set_info *ss;
368 	const char	*prefix;
369 	char		*arg, *delim, *idx, *tmp;
370 	int		suffix, prefix_len;
371 
372 	if (fields == super_fields)
373 		prefix = "s_";
374 	else if (fields == inode_fields)
375 		prefix = "i_";
376 	else
377 		prefix = "bg_";
378 	prefix_len = strlen(prefix);
379 	if (strncmp(field, prefix, prefix_len) == 0)
380 		field += prefix_len;
381 
382 	arg = malloc(strlen(field)+1);
383 	if (!arg)
384 		return NULL;
385 	strcpy(arg, field);
386 
387 	idx = strchr(arg, '[');
388 	if (idx) {
389 		*idx++ = 0;
390 		delim = idx + strlen(idx) - 1;
391 		if (!*idx || *delim != ']')
392 			idx = 0;
393 		else
394 			*delim = 0;
395 	}
396 	/*
397 	 * Can we parse the number?
398 	 */
399 	if (idx) {
400 		array_idx = strtol(idx, &tmp, 0);
401 		if (*tmp) {
402 			*(--idx) = '[';
403 			*delim = ']';
404 			idx = 0;
405 		}
406 	}
407 
408 	/*
409 	 * If there is a valid _hi or a _lo suffix, strip it off
410 	 */
411 	suffix = check_suffix(arg);
412 	if (suffix > 0)
413 		arg[strlen(arg)-3] = 0;
414 
415 	for (ss = fields ; ss->name ; ss++) {
416 		if (suffix && ss->ptr2 == 0)
417 			continue;
418 		if (ss->flags & FLAG_ARRAY) {
419 			if (!idx || (strcmp(ss->name, arg) != 0))
420 				continue;
421 			if (ss->max_idx > 0 && array_idx >= ss->max_idx)
422 				continue;
423 		} else {
424 			if (strcmp(ss->name, arg) != 0)
425 				continue;
426 		}
427 		free(arg);
428 		return ss;
429 	}
430 	free(arg);
431 	return NULL;
432 }
433 
434 /*
435  * Note: info->size == 6 is special; this means a base size 4 bytes,
436  * and secondary (high) size of 2 bytes.  This is needed for the
437  * special case of i_blocks_high and i_file_acl_high.
438  */
parse_uint(struct field_set_info * info,char * field,char * arg)439 static errcode_t parse_uint(struct field_set_info *info, char *field,
440 			    char *arg)
441 {
442 	unsigned long long n, num, mask, limit;
443 	int suffix = check_suffix(field);
444 	char *tmp;
445 	void *field1 = info->ptr, *field2 = info->ptr2;
446 	int size = (info->size == 6) ? 4 : info->size;
447 	union {
448 		__u64	*ptr64;
449 		__u32	*ptr32;
450 		__u16	*ptr16;
451 		__u8	*ptr8;
452 	} u;
453 
454 	if (suffix == 1)
455 		field2 = 0;
456 	if (suffix == 2) {
457 		field1 = field2;
458 		field2 = 0;
459 	}
460 
461 	u.ptr8 = (__u8 *) field1;
462 	if (info->flags & FLAG_ARRAY)
463 		u.ptr8 += array_idx * info->size;
464 
465 	errno = 0;
466 	num = STRTOULL(arg, &tmp, 0);
467 	if (*tmp || errno) {
468 		fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
469 			arg, info->name);
470 		return EINVAL;
471 	}
472 	mask = ~0ULL >> ((8 - size) * 8);
473 	limit = ~0ULL >> ((8 - info->size) * 8);
474 	if (field2 && info->size != 6)
475 		limit = ~0ULL >> ((8 - info->size*2) * 8);
476 
477 	if (num > limit) {
478 		fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
479 			arg, info->name, limit);
480 		return EINVAL;
481 	}
482 	n = num & mask;
483 	switch (size) {
484 	case 8:
485 		/* Should never get here */
486 		fprintf(stderr, "64-bit field %s has a second 64-bit field\n"
487 			"defined; BUG?!?\n", info->name);
488 		*u.ptr64 = 0;
489 		break;
490 	case 4:
491 		*u.ptr32 = n;
492 		break;
493 	case 2:
494 		*u.ptr16 = n;
495 		break;
496 	case 1:
497 		*u.ptr8 = n;
498 		break;
499 	}
500 	if (!field2)
501 		return 0;
502 	n = (size == 8) ? 0 : (num >> (size*8));
503 	u.ptr8 = (__u8 *) field2;
504 	if (info->size == 6)
505 		size = 2;
506 	switch (size) {
507 	case 8:
508 		*u.ptr64 = n;
509 		break;
510 	case 4:
511 		*u.ptr32 = n;
512 		break;
513 	case 2:
514 		*u.ptr16 = n;
515 		break;
516 	case 1:
517 		*u.ptr8 = n;
518 		break;
519 	}
520 	return 0;
521 }
522 
parse_int(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)523 static errcode_t parse_int(struct field_set_info *info,
524 			   char *field EXT2FS_ATTR((unused)), char *arg)
525 {
526 	long	num;
527 	char *tmp;
528 	__s32	*ptr32;
529 	__s16	*ptr16;
530 	__s8	*ptr8;
531 
532 	num = strtol(arg, &tmp, 0);
533 	if (*tmp) {
534 		fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
535 			arg, info->name);
536 		return EINVAL;
537 	}
538 	switch (info->size) {
539 	case 4:
540 		ptr32 = (__s32 *) info->ptr;
541 		*ptr32 = num;
542 		break;
543 	case 2:
544 		ptr16 = (__s16 *) info->ptr;
545 		*ptr16 = num;
546 		break;
547 	case 1:
548 		ptr8 = (__s8 *) info->ptr;
549 		*ptr8 = num;
550 		break;
551 	}
552 	return 0;
553 }
554 
parse_string(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)555 static errcode_t parse_string(struct field_set_info *info,
556 			      char *field EXT2FS_ATTR((unused)), char *arg)
557 {
558 	char	*cp = (char *) info->ptr;
559 
560 	if (strlen(arg) >= info->size) {
561 		fprintf(stderr, "Error maximum size for %s is %d.\n",
562 			info->name, info->size);
563 		return EINVAL;
564 	}
565 	strcpy(cp, arg);
566 	return 0;
567 }
568 
parse_time(struct field_set_info * info,char * field,char * arg)569 static errcode_t parse_time(struct field_set_info *info,
570 			    char *field, char *arg)
571 {
572 	__s64		t;
573 	__u32		t_low, t_high;
574 	__u32		*ptr_low, *ptr_high;
575 
576 	if (check_suffix(field))
577 		return parse_uint(info, field, arg);
578 
579 	ptr_low  = (__u32 *) info->ptr;
580 	ptr_high = (__u32 *) info->ptr2;
581 
582 	t = string_to_time(arg);
583 
584 	if (t == -1) {
585 		fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
586 			arg, info->name);
587 		return EINVAL;
588 	}
589 	t_low = (__u32) t;
590 	t_high = ((t - (__s32)t) >> 32) & EXT4_EPOCH_MASK;
591 	*ptr_low = t_low;
592 	if (ptr_high)
593 		*ptr_high = (*ptr_high & ~EXT4_EPOCH_MASK) | t_high;
594 	return 0;
595 }
596 
parse_uuid(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)597 static errcode_t parse_uuid(struct field_set_info *info,
598 			    char *field EXT2FS_ATTR((unused)), char *arg)
599 {
600 	unsigned char *	p = (unsigned char *) info->ptr;
601 
602 	if ((strcasecmp(arg, "null") == 0) ||
603 	    (strcasecmp(arg, "clear") == 0)) {
604 		uuid_clear(p);
605 	} else if (strcasecmp(arg, "time") == 0) {
606 		uuid_generate_time(p);
607 	} else if (strcasecmp(arg, "random") == 0) {
608 		uuid_generate(p);
609 	} else if (uuid_parse(arg, p)) {
610 		fprintf(stderr, "Invalid UUID format: %s\n", arg);
611 		return EINVAL;
612 	}
613 	return 0;
614 }
615 
parse_hashalg(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)616 static errcode_t parse_hashalg(struct field_set_info *info,
617 			       char *field EXT2FS_ATTR((unused)), char *arg)
618 {
619 	int	hashv;
620 	unsigned char	*p = (unsigned char *) info->ptr;
621 
622 	hashv = e2p_string2hash(arg);
623 	if (hashv < 0) {
624 		fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
625 		return EINVAL;
626 	}
627 	*p = hashv;
628 	return 0;
629 }
630 
parse_bmap(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)631 static errcode_t parse_bmap(struct field_set_info *info,
632 			    char *field EXT2FS_ATTR((unused)), char *arg)
633 {
634 	blk64_t		blk;
635 	errcode_t	retval;
636 	char		*tmp;
637 
638 	blk = strtoull(arg, &tmp, 0);
639 	if (*tmp) {
640 		fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
641 			arg, info->name);
642 		return EINVAL;
643 	}
644 
645 	retval = ext2fs_bmap2(current_fs, set_ino,
646 			      (struct ext2_inode *) &set_inode,
647 			      NULL, BMAP_ALLOC | BMAP_SET, array_idx, NULL,
648 			      &blk);
649 	if (retval) {
650 		com_err("set_inode", retval, "while setting block map");
651 	}
652 	return retval;
653 }
654 
parse_gd_csum(struct field_set_info * info,char * field,char * arg)655 static errcode_t parse_gd_csum(struct field_set_info *info, char *field,
656 			       char *arg)
657 {
658 	__u16 *checksum = info->ptr;
659 
660 	if (strcmp(arg, "calc") == 0) {
661 		*checksum = ext2fs_group_desc_csum(current_fs, set_bg);
662 		printf("Checksum set to 0x%04x\n", *checksum);
663 		return 0;
664 	}
665 	return parse_uint(info, field, arg);
666 }
667 
print_possible_fields(struct field_set_info * fields)668 static void print_possible_fields(struct field_set_info *fields)
669 {
670 	struct field_set_info *ss;
671 	const char	*type, *cmd;
672 	FILE *f;
673 	char name[40], idx[40];
674 
675 	if (fields == super_fields) {
676 		type = "Superblock";
677 		cmd = "set_super_value";
678 	} else if (fields == inode_fields) {
679 		type = "Inode";
680 		cmd = "set_inode";
681 	} else if (fields == mmp_fields) {
682 		type = "MMP";
683 		cmd = "set_mmp_value";
684 	} else {
685 		type = "Block group descriptor";
686 		cmd = "set_block_group";
687 	}
688 	f = open_pager();
689 
690 	fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
691 
692 	for (ss = fields ; ss->name ; ss++) {
693 		type = "unknown";
694 		if (ss->func == parse_string)
695 			type = "string";
696 		else if (ss->func == parse_int)
697 			type = "integer";
698 		else if (ss->func == parse_uint)
699 			type = "unsigned integer";
700 		else if (ss->func == parse_uuid)
701 			type = "UUID";
702 		else if (ss->func == parse_hashalg)
703 			type = "hash algorithm";
704 		else if (ss->func == parse_time)
705 			type = "date/time";
706 		else if (ss->func == parse_bmap)
707 			type = "set physical->logical block map";
708 		else if (ss->func == parse_gd_csum)
709 			type = "unsigned integer OR \"calc\"";
710 		strcpy(name, ss->name);
711 		if (ss->flags & FLAG_ARRAY) {
712 			if (ss->max_idx > 0)
713 				sprintf(idx, "[%d]", ss->max_idx);
714 			else
715 				strcpy(idx, "[]");
716 			strcat(name, idx);
717 		}
718 		if (ss->ptr2)
719 			strcat(name, "[_hi|_lo]");
720 		fprintf(f, "\t%-25s\t%s\n", name, type);
721 	}
722 	close_pager(f);
723 }
724 
725 
do_set_super(int argc,char * argv[],int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))726 void do_set_super(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
727 		  void *infop EXT2FS_ATTR((unused)))
728 {
729 	const char *usage = "<field> <value>\n"
730 		"\t\"set_super_value -l\" will list the names of "
731 		"superblock fields\n\twhich can be set.";
732 	static struct field_set_info *ss;
733 
734 	if ((argc == 2) && !strcmp(argv[1], "-l")) {
735 		print_possible_fields(super_fields);
736 		return;
737 	}
738 
739 	if (common_args_process(argc, argv, 3, 3, "set_super_value",
740 				usage, CHECK_FS_RW))
741 		return;
742 
743 	if ((ss = find_field(super_fields, argv[1])) == 0) {
744 		com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
745 		return;
746 	}
747 	set_sb = *current_fs->super;
748 	if (ss->func(ss, argv[1], argv[2]) == 0) {
749 		*current_fs->super = set_sb;
750 		ext2fs_mark_super_dirty(current_fs);
751 	}
752 }
753 
do_set_inode(int argc,char * argv[],int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))754 void do_set_inode(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
755 		  void *infop EXT2FS_ATTR((unused)))
756 {
757 	const char *usage = "<inode> <field> <value>\n"
758 		"\t\"set_inode_field -l\" will list the names of "
759 		"the fields in an ext2 inode\n\twhich can be set.";
760 	static struct field_set_info *ss;
761 
762 	if ((argc == 2) && !strcmp(argv[1], "-l")) {
763 		print_possible_fields(inode_fields);
764 		return;
765 	}
766 
767 	if (common_args_process(argc, argv, 4, 4, "set_inode",
768 				usage, CHECK_FS_RW))
769 		return;
770 
771 	if ((ss = find_field(inode_fields, argv[2])) == 0) {
772 		com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
773 		return;
774 	}
775 
776 	set_ino = string_to_inode(argv[1]);
777 	if (!set_ino)
778 		return;
779 
780 	if (debugfs_read_inode_full(set_ino,
781 			(struct ext2_inode *) &set_inode, argv[1],
782 				    sizeof(set_inode)))
783 		return;
784 
785 	if (ss->func(ss, argv[2], argv[3]) == 0) {
786 		if (debugfs_write_inode_full(set_ino,
787 			     (struct ext2_inode *) &set_inode,
788 			     argv[1], sizeof(set_inode)))
789 			return;
790 	}
791 }
792 
do_set_block_group_descriptor(int argc,char * argv[],int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))793 void do_set_block_group_descriptor(int argc, char *argv[],
794 				   int sci_idx EXT2FS_ATTR((unused)),
795 				   void *infop EXT2FS_ATTR((unused)))
796 {
797 	const char *usage = "<bg number> <field> <value>\n"
798 		"\t\"set_block_group -l\" will list the names of "
799 		"the fields in a block group descriptor\n\twhich can be set.";
800 	struct field_set_info	*table;
801 	struct field_set_info	*ss;
802 	char			*end;
803 	void			*edit, *target;
804 	int			size;
805 
806 	/*
807 	 * Determine whether we are editing an ext2 or ext4 block group
808 	 * descriptor.  Descriptors larger than ext4_group_desc cannot
809 	 * have their fields edited yet, because they do not have any
810 	 * names assigned.  When that happens, this function needs to
811 	 * be updated for the new descriptor struct and fields.
812 	 */
813 	if (current_fs &&
814 	    EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) {
815 		table = ext4_bg_fields;
816 		edit = &set_gd4;
817 		size = sizeof(set_gd4);
818 	} else {
819 		table = ext2_bg_fields;
820 		edit = &set_gd;
821 		size = sizeof(set_gd);
822 	}
823 
824 	if ((argc == 2) && !strcmp(argv[1], "-l")) {
825 		print_possible_fields(table);
826 		return;
827 	}
828 
829 	if (common_args_process(argc, argv, 4, 4, "set_block_group",
830 				usage, CHECK_FS_RW))
831 		return;
832 
833 	set_bg = strtoul(argv[1], &end, 0);
834 	if (*end) {
835 		com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
836 		return;
837 	}
838 
839 	if (set_bg >= current_fs->group_desc_count) {
840 		com_err(argv[0], 0, "block group number too big: %d", set_bg);
841 		return;
842 	}
843 
844 	if ((ss = find_field(table, argv[2])) == 0) {
845 		com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
846 		return;
847 	}
848 
849 	target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg);
850 	memcpy(edit, target, size);
851 	if (ss->func(ss, argv[2], argv[3]) == 0) {
852 		memcpy(target, edit, size);
853 		ext2fs_mark_super_dirty(current_fs);
854 	}
855 }
856 
parse_mmp_clear(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg EXT2FS_ATTR ((unused)))857 static errcode_t parse_mmp_clear(struct field_set_info *info,
858 				 char *field EXT2FS_ATTR((unused)),
859 				 char *arg EXT2FS_ATTR((unused)))
860 {
861 	errcode_t retval;
862 
863 	retval = ext2fs_mmp_clear(current_fs);
864 	if (retval != 0)
865 		com_err("set_mmp_value", retval, "while clearing MMP block\n");
866 	else
867 		memcpy(info->ptr, current_fs->mmp_buf, info->size);
868 
869 	return 1; /* we don't need the MMP block written again */
870 }
871 
872 #ifdef CONFIG_MMP
do_set_mmp_value(int argc,char * argv[],int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))873 void do_set_mmp_value(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
874 		      void *infop EXT2FS_ATTR((unused)))
875 {
876 	const char *usage = "<field> <value>\n"
877 		"\t\"set_mmp_value -l\" will list the names of "
878 		"MMP fields\n\twhich can be set.";
879 	static struct field_set_info *smmp;
880 	struct mmp_struct *mmp_s;
881 	errcode_t retval;
882 
883 	if (argc == 2 && strcmp(argv[1], "-l") == 0) {
884 		print_possible_fields(mmp_fields);
885 		return;
886 	}
887 
888 	if (check_fs_open(argv[0]))
889 		return;
890 
891 	if (current_fs->super->s_mmp_block == 0) {
892 		com_err(argv[0], 0, "no MMP block allocated\n");
893 		return;
894 	}
895 
896 	if (common_args_process(argc, argv, 2, 3, "set_mmp_value",
897 				usage, CHECK_FS_RW))
898 		return;
899 
900 	mmp_s = current_fs->mmp_buf;
901 	if (mmp_s == NULL) {
902 		retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s);
903 		if (retval) {
904 			com_err(argv[0], retval, "allocating MMP buffer\n");
905 			return;
906 		}
907 		retval = ext2fs_mmp_read(current_fs,
908 					 current_fs->super->s_mmp_block, mmp_s);
909 		if (retval) {
910 			com_err(argv[0], retval, "reading MMP block %llu.\n",
911 				(long long)current_fs->super->s_mmp_block);
912 			ext2fs_free_mem(&mmp_s);
913 			return;
914 		}
915 		current_fs->mmp_buf = mmp_s;
916 	}
917 
918 	smmp = find_field(mmp_fields, argv[1]);
919 	if (smmp == 0) {
920 		com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
921 		return;
922 	}
923 
924 	set_mmp = *mmp_s;
925 	if (smmp->func(smmp, argv[1], argv[2]) == 0) {
926 		ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block,
927 				 &set_mmp);
928 		*mmp_s = set_mmp;
929 	}
930 }
931 #else
do_set_mmp_value(int argc EXT2FS_ATTR ((unused)),char * argv[]EXT2FS_ATTR ((unused)),int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))932 void do_set_mmp_value(int argc EXT2FS_ATTR((unused)),
933 		      char *argv[] EXT2FS_ATTR((unused)),
934 		      int sci_idx EXT2FS_ATTR((unused)),
935 		      void *infop EXT2FS_ATTR((unused)))
936 {
937 	fprintf(stdout, "MMP is unsupported, please recompile with "
938 	                "--enable-mmp\n");
939 }
940 #endif
941 
942