summaryrefslogtreecommitdiffstats
path: root/target/makedevs/makedevs.c
blob: d2b3a2a74b6fbdf53cf32332380738a0b06d837b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
/* vi: set sw=4 ts=4: */
/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Library General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <getopt.h>
#include <time.h>
#include <pwd.h>
#include <grp.h>
#include <unistd.h>
#include <errno.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/sysmacros.h>     /* major() and minor() */


const char *bb_applet_name;

void bb_verror_msg(const char *s, va_list p)
{
	fflush(stdout);
	fprintf(stderr, "%s: ", bb_applet_name);
	vfprintf(stderr, s, p);
}

void bb_error_msg(const char *s, ...)
{
	va_list p;

	va_start(p, s);
	bb_verror_msg(s, p);
	va_end(p);
	putc('\n', stderr);
}

void bb_error_msg_and_die(const char *s, ...)
{
	va_list p;

	va_start(p, s);
	bb_verror_msg(s, p);
	va_end(p);
	putc('\n', stderr);
	exit(1);
}
void bb_vperror_msg(const char *s, va_list p)
{
	int err=errno;
	if(s == 0) s = "";
	bb_verror_msg(s, p);
	if (*s) s = ": ";
	fprintf(stderr, "%s%s\n", s, strerror(err));
}

void bb_perror_msg(const char *s, ...)
{
	va_list p;

	va_start(p, s);
	bb_vperror_msg(s, p);
	va_end(p);
}

void bb_perror_msg_and_die(const char *s, ...)
{
	va_list p;

	va_start(p, s);
	bb_vperror_msg(s, p);
	va_end(p);
	exit(1);
}

FILE *bb_xfopen(const char *path, const char *mode)
{
	FILE *fp;
	if ((fp = fopen(path, mode)) == NULL)
		bb_perror_msg_and_die("%s", path);
	return fp;
}

int bb_make_directory (char *path, long mode, int flags)
{
	mode_t mask;
	const char *fail_msg;
	char *s = path;
	char c;
	struct stat st;
	enum {
		FILEUTILS_PRESERVE_STATUS = 1,
		FILEUTILS_DEREFERENCE = 2,
		FILEUTILS_RECUR = 4,
		FILEUTILS_FORCE = 8,
		FILEUTILS_INTERACTIVE = 16
	};

	mask = umask(0);
	if (mode == -1) {
		umask(mask);
		mode = (S_IXUSR | S_IXGRP | S_IXOTH |
				S_IWUSR | S_IWGRP | S_IWOTH |
				S_IRUSR | S_IRGRP | S_IROTH) & ~mask;
	} else {
		umask(mask & ~0300);
	}

	do {
		c = 0;

		if (flags & FILEUTILS_RECUR) {	/* Get the parent. */
			/* Bypass leading non-'/'s and then subsequent '/'s. */
			while (*s) {
				if (*s == '/') {
					do {
						++s;
					} while (*s == '/');
					c = *s;		/* Save the current char */
					*s = 0;		/* and replace it with nul. */
					break;
				}
				++s;
			}
		}

		if (mkdir(path, 0777) < 0) {
			/* If we failed for any other reason than the directory
			 * already exists, output a diagnostic and return -1.*/
			if (errno != EEXIST
				|| !(flags & FILEUTILS_RECUR)
				|| (stat(path, &st) < 0 || !S_ISDIR(st.st_mode))) {
				fail_msg = "create";
				umask(mask);
				break;
			}
			/* Since the directory exists, don't attempt to change
			 * permissions if it was the full target.  Note that
			 * this is not an error conditon. */
			if (!c) {
				umask(mask);
				return 0;
			}
		}

		if (!c) {
			/* Done.  If necessary, updated perms on the newly
			 * created directory.  Failure to update here _is_
			 * an error.*/
			umask(mask);
			if ((mode != -1) && (chmod(path, mode) < 0)){
				fail_msg = "set permissions of";
				break;
			}
			return 0;
		}

		/* Remove any inserted nul from the path (recursive mode). */
		*s = c;

	} while (1);

	bb_perror_msg ("Cannot %s directory `%s'", fail_msg, path);
	return -1;
}

const char * const bb_msg_memory_exhausted = "memory exhausted";

void *xmalloc(size_t size)
{
	void *ptr = malloc(size);
	if (ptr == NULL && size != 0)
		bb_error_msg_and_die(bb_msg_memory_exhausted);
	return ptr;
}

void *xcalloc(size_t nmemb, size_t size)
{
	void *ptr = calloc(nmemb, size);
	if (ptr == NULL && nmemb != 0 && size != 0)
		bb_error_msg_and_die(bb_msg_memory_exhausted);
	return ptr;
}

void *xrealloc(void *ptr, size_t size)
{
	ptr = realloc(ptr, size);
	if (ptr == NULL && size != 0)
		bb_error_msg_and_die(bb_msg_memory_exhausted);
	return ptr;
}

char *private_get_line_from_file(FILE *file, int c)
{
#define GROWBY (80)		/* how large we will grow strings by */

	int ch;
	int idx = 0;
	char *linebuf = NULL;
	int linebufsz = 0;

	while ((ch = getc(file)) != EOF) {
		/* grow the line buffer as necessary */
		if (idx > linebufsz - 2) {
			linebuf = xrealloc(linebuf, linebufsz += GROWBY);
		}
		linebuf[idx++] = (char)ch;
		if (!ch) return linebuf;
		if (c<2 && ch == '\n') {
			if (c) {
				--idx;
			}
			break;
		}
	}
	if (linebuf) {
		if (ferror(file)) {
			free(linebuf);
			return NULL;
		}
		linebuf[idx] = 0;
	}
	return linebuf;
}

char *bb_get_chomped_line_from_file(FILE *file)
{
	return private_get_line_from_file(file, 1);
}

long my_getpwnam(const char *name)
{
	struct passwd *myuser;

	myuser  = getpwnam(name);
	if (myuser==NULL)
		bb_error_msg_and_die("unknown user name: %s", name);

	return myuser->pw_uid;
}

long my_getgrnam(const char *name)
{
	struct group *mygroup;

	mygroup  = getgrnam(name);
	if (mygroup==NULL)
		bb_error_msg_and_die("unknown group name: %s", name);

	return (mygroup->gr_gid);
}

unsigned long get_ug_id(const char *s, long (*my_getxxnam)(const char *))
{
	unsigned long r;
	char *p;

	r = strtoul(s, &p, 10);
	if (*p || (s == p)) {
		r = my_getxxnam(s);
	}

	return r;
}

char * last_char_is(const char *s, int c)
{
	char *sret = (char *)s;
	if (sret) {
		sret = strrchr(sret, c);
		if(sret != NULL && *(sret+1) != 0)
			sret = NULL;
	}
	return sret;
}

void bb_xasprintf(char **string_ptr, const char *format, ...)
{
	va_list p;
	int r;

	va_start(p, format);
	r = vasprintf(string_ptr, format, p);
	va_end(p);

	if (r < 0) {
		bb_perror_msg_and_die("bb_xasprintf");
	}
}

char *concat_path_file(const char *path, const char *filename)
{
	char *outbuf;
	char *lc;

	if (!path)
		path = "";
	lc = last_char_is(path, '/');
	while (*filename == '/')
		filename++;
	bb_xasprintf(&outbuf, "%s%s%s", path, (lc==NULL ? "/" : ""), filename);

	return outbuf;
}

int main(int argc, char **argv)
{
	int opt;
	FILE *table = stdin;
	char *rootdir = "./";
	char *line;
	int ret = EXIT_SUCCESS;

	bb_applet_name = argv[0];

	while ((opt = getopt(argc, argv, "d:r:")) != -1) {
		switch(opt) {
		case 'd':
			table = bb_xfopen(optarg, "r");
			break;
		case 'n':
			rootdir = optarg;
			break;
		default:
			fprintf(stderr, "%s: [-r rootdir] [device_table]\n\n", bb_applet_name);
			fprintf(stderr, "Creates a batch of special files as specified in a device table.\n");
			fprintf(stderr, "Device table entries take the form of:\n");
			fprintf(stderr, "type mode user group major minor start increment count\n\n");
			fprintf(stderr, "Where name is the file name,  type can be one of:\n");
			fprintf(stderr, "      f       A regular file\n");
			fprintf(stderr, "      d       Directory\n");
			fprintf(stderr, "      c       Character special device file\n");
			fprintf(stderr, "      b       Block special device file\n");
			fprintf(stderr, "      p       Fifo (named pipe)\n");
			fprintf(stderr, "uid is the user id for the target file, gid is the group id for the\n");
			fprintf(stderr, "target file.  The rest of the entries (major, minor, etc) apply to\n");
			fprintf(stderr, "to device special files.  A '-' may be used for blank entries.\n\n");
			fprintf(stderr, "For example:\n");
            fprintf(stderr, "<name>    <type> <mode> <uid> <gid> <major> <minor> <start> <inc> <count>\n");
            fprintf(stderr, "/dev         d    755    0    0     -       -       -       -     -\n");
            fprintf(stderr, "/dev/console c    666    0    0     5       1       -       -     -\n");
            fprintf(stderr, "/dev/null    c    666    0    0     1       3       0       0     -\n");
            fprintf(stderr, "/dev/zero    c    666    0    0     1       5       0       0     -\n");
            fprintf(stderr, "/dev/hda     b    640    0    0     3       0       0       0     -\n");
            fprintf(stderr, "/dev/hda     b    640    0    0     3       1       1       1     15\n\n");
            fprintf(stderr, "Will Produce:\n");
            fprintf(stderr, "/dev\n");
            fprintf(stderr, "/dev/console\n");
            fprintf(stderr, "/dev/null\n");
            fprintf(stderr, "/dev/zero\n");
            fprintf(stderr, "/dev/hda\n");
            fprintf(stderr, "/dev/hda[0-15]\n");
			exit(1);
		}
	}


	if (chdir(rootdir) == -1) {
		bb_perror_msg_and_die("Couldnt chdir to %s", rootdir);
	}

	umask(0);

	while ((line = bb_get_chomped_line_from_file(table))) {
		char type;
		unsigned int mode = 0755;
		unsigned int major = 0;
		unsigned int minor = 0;
		unsigned int count = 0;
		unsigned int increment = 0;
		unsigned int start = 0;
		char name[41];
		char user[41];
		char group[41];
		char *full_name;
		uid_t uid;
		gid_t gid;

		if ((2 > sscanf(line, "%40s %c %o %40s %40s %u %u %u %u %u", name,
			&type, &mode, user, group, &major,
			&minor, &start, &increment, &count)) ||
			((major | minor | start | count | increment) > 255)) {
			bb_error_msg("Ignoring invalid line\n%s\n", line);
			ret = EXIT_FAILURE;
			continue;
		}
		if (name[0] == '#') {
			continue;
		}
		if (group) {
			gid = get_ug_id(group, my_getgrnam);
		} else {
			gid = getgid();
		}
		if (user) {
			uid = get_ug_id(user, my_getpwnam);
		} else {
			uid = getuid();
		}
		full_name = concat_path_file(rootdir, name);

		if (type == 'd') {
			bb_make_directory(full_name, mode | S_IFDIR, 0);
			if (chown(full_name, uid, gid) == -1) {
				bb_perror_msg("chown failed for %s", full_name);
				ret = EXIT_FAILURE;
				goto loop;
			}
		} else {
			dev_t rdev;

			if (type == 'p') {
				mode |= S_IFIFO;
			}
			else if (type == 'c') {
				mode |= S_IFCHR;
			}
			else if (type == 'b') {
				mode |= S_IFBLK;
			} else {
				bb_error_msg("Unsupported file type %c", type);
				ret = EXIT_FAILURE;
				goto loop;
			}

			if (count > 0) {
				int i;
				char *full_name_inc;

				full_name_inc = xmalloc(strlen(full_name) + 4);
				for (i = start; i < count; i++) {
					sprintf(full_name_inc, "%s%d", full_name, i);
					rdev = (major << 8) + minor + (i * increment - start);
					if (mknod(full_name_inc, mode, rdev) == -1) {
						bb_perror_msg("Couldnt create node %s", full_name_inc);
						ret = EXIT_FAILURE;
					}
					else if (chown(full_name_inc, uid, gid) == -1) {
						bb_perror_msg("chown failed for %s", full_name_inc);
						ret = EXIT_FAILURE;
					}
				}
				free(full_name_inc);
			} else {
				rdev = (major << 8) + minor;
				if (mknod(full_name, mode, rdev) == -1) {
					bb_perror_msg("Couldnt create node %s", full_name);
					ret = EXIT_FAILURE;
				}
				else if (chown(full_name, uid, gid) == -1) {
					bb_perror_msg("chown failed for %s", full_name);
					ret = EXIT_FAILURE;
				}
			}
		}
loop:
		free(line);
		free(full_name);
	}
	fclose(table);

	return 0;
}