aboutsummaryrefslogtreecommitdiff
path: root/busybox.c
blob: 5c10eb1d917a1ce74dfceea36514cbb6017020be (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
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
/* vi: set sw=4 ts=4: */
#include "internal.h"
#include <stdio.h>
#include <string.h>
#include <errno.h>

static int been_there_done_that = 0;

/* It has been alledged that doing such things can
 * help reduce binary size when staticly linking,
 * of course with glibc, this is unlikely as long
 * as we use things like printf -- perhaps a printf
 * replacement may be in order 
 */
#if 0
void exit(int status) __attribute__ ((noreturn));
void exit(int status)
{
	_exit(status);
};
void abort(void) __attribute__ ((__noreturn__));
void abort(void)
{
	_exit(0);
};
int atexit(void (*__func) (void))
{
	_exit(0);
};
void *__libc_stack_end;
#endif

const struct BB_applet applets[] = {

#ifdef BB_AR
	{"ar", ar_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_BASENAME
	{"basename", basename_main, _BB_DIR_USR_BIN},
#endif
	{"busybox", busybox_main, _BB_DIR_BIN},
#ifdef BB_CAT
	{"cat", cat_main, _BB_DIR_BIN},
#endif
#ifdef BB_CHMOD_CHOWN_CHGRP
	{"chgrp", chmod_chown_chgrp_main, _BB_DIR_BIN},
#endif
#ifdef BB_CHMOD_CHOWN_CHGRP
	{"chmod", chmod_chown_chgrp_main, _BB_DIR_BIN},
#endif
#ifdef BB_CHMOD_CHOWN_CHGRP
	{"chown", chmod_chown_chgrp_main, _BB_DIR_BIN},
#endif
#ifdef BB_CHROOT
	{"chroot", chroot_main, _BB_DIR_SBIN},
#endif
#ifdef BB_CLEAR
	{"clear", clear_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_CHVT
	{"chvt", chvt_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_CP_MV
	{"cp", cp_mv_main, _BB_DIR_BIN},
#endif
#ifdef BB_CUT
	{"cut", cut_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_DATE
	{"date", date_main, _BB_DIR_BIN},
#endif
#ifdef BB_DC
	{"dc", dc_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_DD
	{"dd", dd_main, _BB_DIR_BIN},
#endif
#ifdef BB_DF
	{"df", df_main, _BB_DIR_BIN},
#endif
#ifdef BB_DIRNAME
	{"dirname", dirname_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_DMESG
	{"dmesg", dmesg_main, _BB_DIR_BIN},
#endif
#ifdef BB_DU
	{"du", du_main, _BB_DIR_BIN},
#endif
#ifdef BB_DUTMP
	{"dutmp", dutmp_main, _BB_DIR_USR_SBIN},
#endif
#ifdef BB_ECHO
	{"echo", echo_main, _BB_DIR_BIN},
#endif
#ifdef BB_TRUE_FALSE
	{"false", false_main, _BB_DIR_BIN},
#endif
#ifdef BB_FBSET
	{"fbset", fbset_main, _BB_DIR_USR_SBIN},
#endif
#ifdef BB_FDFLUSH
	{"fdflush", fdflush_main, _BB_DIR_BIN},
#endif
#ifdef BB_FIND
	{"find", find_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_FREE
	{"free", free_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_FREERAMDISK
	{"freeramdisk", freeramdisk_main, _BB_DIR_SBIN},
#endif
#ifdef BB_DEALLOCVT
	{"deallocvt", deallocvt_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_FSCK_MINIX
	{"fsck.minix", fsck_minix_main, _BB_DIR_SBIN},
#endif
#ifdef BB_GREP
	{"grep", grep_main, _BB_DIR_BIN},
#endif
#ifdef BB_GUNZIP
	{"gunzip", gunzip_main, _BB_DIR_BIN},
#endif
#ifdef BB_GZIP
	{"gzip", gzip_main, _BB_DIR_BIN},
#endif
#ifdef BB_HALT
	{"halt", halt_main, _BB_DIR_SBIN},
#endif
#ifdef BB_HEAD
	{"head", head_main, _BB_DIR_BIN},
#endif
#ifdef BB_HOSTID
	{"hostid", hostid_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_HOSTNAME
	{"hostname", hostname_main, _BB_DIR_BIN},
#endif
#ifdef BB_ID
	{"id", id_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_INIT
	{"init", init_main, _BB_DIR_SBIN},
#endif
#ifdef BB_INSMOD
	{"insmod", insmod_main, _BB_DIR_SBIN},
#endif
#ifdef BB_KILL
	{"kill", kill_main, _BB_DIR_BIN},
#endif
#ifdef BB_KILLALL
	{"killall", kill_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_LENGTH
	{"length", length_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_LINUXRC
	{"linuxrc", init_main, _BB_DIR_ROOT},
#endif
#ifdef BB_LN
	{"ln", ln_main, _BB_DIR_BIN},
#endif
#ifdef BB_LOADACM
	{"loadacm", loadacm_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_LOADFONT
	{"loadfont", loadfont_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_LOADKMAP
	{"loadkmap", loadkmap_main, _BB_DIR_SBIN},
#endif
#ifdef BB_LOGGER
	{"logger", logger_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_LOGNAME
	{"logname", logname_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_LS
	{"ls", ls_main, _BB_DIR_BIN},
#endif
#ifdef BB_LSMOD
	{"lsmod", lsmod_main, _BB_DIR_SBIN},
#endif
#ifdef BB_MAKEDEVS
	{"makedevs", makedevs_main, _BB_DIR_SBIN},
#endif
#ifdef BB_MD5SUM
	{"md5sum", md5sum_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_MKDIR
	{"mkdir", mkdir_main, _BB_DIR_BIN},
#endif
#ifdef BB_MKFIFO
	{"mkfifo", mkfifo_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_MKFS_MINIX
	{"mkfs.minix", mkfs_minix_main, _BB_DIR_SBIN},
#endif
#ifdef BB_MKNOD
	{"mknod", mknod_main, _BB_DIR_BIN},
#endif
#ifdef BB_MKSWAP
	{"mkswap", mkswap_main, _BB_DIR_SBIN},
#endif
#ifdef BB_MKTEMP
	{"mktemp", mktemp_main, _BB_DIR_BIN},
#endif
#ifdef BB_NC
	{"nc", nc_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_MORE
	{"more", more_main, _BB_DIR_BIN},
#endif
#ifdef BB_MOUNT
	{"mount", mount_main, _BB_DIR_BIN},
#endif
#ifdef BB_MT
	{"mt", mt_main, _BB_DIR_BIN},
#endif
#ifdef BB_CP_MV
	{"mv", cp_mv_main, _BB_DIR_BIN},
#endif
#ifdef BB_NSLOOKUP
	{"nslookup", nslookup_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_PING
	{"ping", ping_main, _BB_DIR_BIN},
#endif
#ifdef BB_POWEROFF
	{"poweroff", poweroff_main, _BB_DIR_SBIN},
#endif
#ifdef BB_PRINTF
	{"printf", printf_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_PS
	{"ps", ps_main, _BB_DIR_BIN},
#endif
#ifdef BB_PWD
	{"pwd", pwd_main, _BB_DIR_BIN},
#endif
#ifdef BB_REBOOT
	{"reboot", reboot_main, _BB_DIR_SBIN},
#endif
#ifdef BB_RM
	{"rm", rm_main, _BB_DIR_BIN},
#endif
#ifdef BB_RMDIR
	{"rmdir", rmdir_main, _BB_DIR_BIN},
#endif
#ifdef BB_RMMOD
	{"rmmod", rmmod_main, _BB_DIR_SBIN},
#endif
#ifdef BB_SED
	{"sed", sed_main, _BB_DIR_BIN},
#endif
#ifdef BB_SETKEYCODES
	{"setkeycodes", setkeycodes_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_SFDISK
	{"sfdisk", sfdisk_main, _BB_DIR_SBIN},
#endif
#ifdef BB_SH
	{"sh", shell_main, _BB_DIR_BIN},
#endif
#ifdef BB_SLEEP
	{"sleep", sleep_main, _BB_DIR_BIN},
#endif
#ifdef BB_SORT
	{"sort", sort_main, _BB_DIR_BIN},
#endif
#ifdef BB_SYNC
	{"sync", sync_main, _BB_DIR_BIN},
#endif
#ifdef BB_SYSLOGD
	{"syslogd", syslogd_main, _BB_DIR_SBIN},
#endif
#ifdef BB_SWAPONOFF
	{"swapon", swap_on_off_main, _BB_DIR_SBIN},
#endif
#ifdef BB_SWAPONOFF
	{"swapoff", swap_on_off_main, _BB_DIR_SBIN},
#endif
#ifdef BB_TAIL
	{"tail", tail_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_TAR
	{"tar", tar_main, _BB_DIR_BIN},
#endif
#ifdef BB_TELNET
	{"telnet", telnet_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_TEST
	{"test", test_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_TEE
	{"tee", tee_main, _BB_DIR_BIN},
#endif
#ifdef BB_TOUCH
	{"touch", touch_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_TR
	{"tr", tr_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_TRUE_FALSE
	{"true", true_main, _BB_DIR_BIN},
#endif
#ifdef BB_TTY
	{"tty", tty_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_UMOUNT
	{"umount", umount_main, _BB_DIR_BIN},
#endif
#ifdef BB_UNAME
	{"uname", uname_main, _BB_DIR_BIN},
#endif
#ifdef BB_UNIQ
	{"uniq", uniq_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_UPDATE
	{"update", update_main, _BB_DIR_SBIN},
#endif
#ifdef BB_UPTIME
	{"uptime", uptime_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_UUENCODE
	{"uuencode", uuencode_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_UUDECODE
	{"uudecode", uudecode_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_USLEEP
	{"usleep", usleep_main, _BB_DIR_BIN},
#endif
#ifdef BB_WC
	{"wc", wc_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_WHICH
	{"which", which_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_WHOAMI
	{"whoami", whoami_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_YES
	{"yes", yes_main, _BB_DIR_USR_BIN},
#endif
#ifdef BB_GUNZIP
	{"zcat", gunzip_main, _BB_DIR_BIN},
#endif
#ifdef BB_TEST
	{"[", test_main, _BB_DIR_USR_BIN},
#endif
	{0}
};


#ifdef BB_FEATURE_INSTALLER
/* 
 * directory table
 *		this should be consistent w/ the enum, internal.h::Location,
 *		or else...
 */
static char* install_dir[] = {
	"/",
	"/bin",
	"/sbin",
	"/usr/bin",
	"/usr/sbin",
};

/* abstract link() */
typedef int (*__link_f)(const char *, const char *);

/* 
 * Where in the filesystem is this busybox?
 * [return]
 *		malloc'd string w/ full pathname of busybox's location
 *		NULL on failure
 */
static char *busybox_fullpath()
{
	pid_t pid;
	char path[256];
	char proc[256];
	int len;

	pid = getpid();
	sprintf(proc, "/proc/%d/exe", pid);
	len = readlink(proc, path, 256);
	if (len != -1) {
		path[len] = 0;
	} else {
		fprintf(stderr, "busybox : %s : %s\n", proc, strerror(errno));
		return NULL;
	}
	return strdup(path);
}

/* create (sym)links for each applet */
static int install_links(const char *busybox, int use_symbolic_links)
{
	__link_f Link = link;

	char command[256];
	int i;
	int rc = 0;

	if (use_symbolic_links) Link = symlink;

	for (i = 0; applets[i].name != NULL; i++) {
		sprintf (
			command, 
			"%s/%s", 
			install_dir[applets[i].location], 
			applets[i].name
		);
#if 1
		rc |= Link(busybox, command);
#else
		puts(command);
#endif
		if (rc) {
			fprintf(stderr,"busybox : %s : %s\n", command, strerror(errno));
		}
	}
	return rc;
}

#if 0
int uninstall_links() ?
#endif
#endif /* BB_FEATURE_INSTALLER */


int main(int argc, char **argv)
{
	char				*s;
	char				*name;
	const struct BB_applet	*a		= applets;

#ifdef BB_FEATURE_INSTALLER	
	/* 
	 * This style of argument parsing doesn't scale well 
	 * in the event that busybox starts wanting more --options.
	 * If someone has a cleaner approach, by all means implement it.
	 */
	if (argc > 1 && (strcmp(argv[1], "--install") == 0)) {
		int use_symbolic_links = 0;
		int rc = 0;
		char *busybox;

		/* to use symlinks, or not to use symlinks... */
		if (argc > 2) {
			if ((strcmp(argv[2], "-s") == 0)) { 
				use_symbolic_links = 1; 
			}
		}

		/* link */
		busybox = busybox_fullpath();
		if (busybox) {
			install_links(busybox, use_symbolic_links);
			free(busybox);
		} else {
			rc = 1;
		}
		return rc;
	}
#endif /* BB_FEATURE_INSTALLER */

	for (s = name = argv[0]; *s != '\0';) {
		if (*s++ == '/')
			name = s;
	}

	*argv = name;

#ifdef BB_SH
	/* Add in a special case hack -- whenever **argv == '-'
	 * (i.e. '-su' or '-sh') always invoke the shell */
	if (**argv == '-')
		exit(((*(shell_main)) (argc, argv)));
#endif

	while (a->name != 0) {
		if (strcmp(name, a->name) == 0) {
			exit(((*(a->main)) (argc, argv)));
		}
		a++;
	}
	return(busybox_main(argc, argv));
}


int busybox_main(int argc, char **argv)
{
	int col = 0;

	argc--;
	argv++;

	if (been_there_done_that == 1 || argc < 1) {
		const struct BB_applet *a = applets;

		fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n"
				"Usage: busybox [function] [arguments]...\n"
				"   or: [function] [arguments]...\n\n"
				"\tBusyBox is a multi-call binary that combines many common Unix\n"
				"\tutilities into a single executable.  Most people will create a\n"
				"\tlink to busybox for each function they wish to use, and BusyBox\n"
				"\twill act like whatever it was invoked as.\n" 
				"\nCurrently defined functions:\n", BB_VER, BB_BT);

		while (a->name != 0) {
			col +=
				fprintf(stderr, "%s%s", ((col == 0) ? "\t" : ", "),
						(a++)->name);
			if (col > 60 && a->name != 0) {
				fprintf(stderr, ",\n");
				col = 0;
			}
		}
		fprintf(stderr, "\n\n");
		exit(-1);
	}
	/* If we've already been here once, exit now */
	been_there_done_that = 1;
	return (main(argc, argv));
}

/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/