File: scanmacho.c

package info (click to toggle)
pax-utils 1.2.4-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 728 kB
  • sloc: ansic: 8,752; sh: 671; python: 495; makefile: 303
file content (775 lines) | stat: -rw-r--r-- 21,375 bytes parent folder | download
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
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
/*
 * Copyright 2008-2012 Gentoo Foundation
 * Distributed under the terms of the GNU General Public License v2
 *
 * based on scanelf by:
 * Copyright 2003-2012 Ned Ludd        - <solar@gentoo.org>
 * Copyright 2004-2012 Mike Frysinger  - <vapier@gentoo.org>
 * for Darwin specific fun:
 *           2008-2013 Fabian Groffen  - <grobian@gentoo.org>
 */

const char argv0[] = "scanmacho";

#include "paxinc.h"

#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')

/* prototypes */
static int scanmacho_fatobj(fatobj *fobj);
static int scanmacho_file(const char *filename, const struct stat *st_cache);
static int scanmacho_from_file(const char *filename);
static int scanmacho_dir(const char *path);
static void scanmacho_envpath(void);
static void usage(int status);
static int parseargs(int argc, char *argv[]);

/* variables to control behavior */
static const char *match_etypes = NULL;
static char scan_envpath = 0;
static char scan_symlink = 1;
static char scan_archives = 0;
static char dir_recurse = 0;
static char dir_crossmount = 1;
static char show_perms = 0;
static char show_size = 0;
static char show_rpath = 0;
static char show_needed = 0;
static char show_interp = 0;
static char show_bind = 0;
static char show_soname = 0;
static char show_banner = 1;
static char show_endian = 0;
static char be_quiet = 0;
static char be_verbose = 0;
static char be_wewy_wewy_quiet = 0;
static char be_semi_verbose = 0;
static char *find_lib = NULL;
static char *out_format = NULL;
static char *search_path = NULL;
static char g_match = 0;

static int match_bits = 0;
static unsigned int match_perms = 0;

static void scanmacho_file_rpath(
		fatobj *fobj,
		char *found_rpath,
		char **ret,
		size_t *ret_len)
{
	loadcmd *lcmd;
	uint32_t lc_rpath;

	if (!show_rpath) return;

	lcmd = firstloadcmd(fobj);
	lc_rpath = MGET(fobj->swapped, LC_RPATH);

	do {
		if (lcmd->lcmd->cmd == lc_rpath) {
			struct rpath_command *dlcmd = lcmd->data;
			char *rpath;
			rpath = lcmd->data + MGET(fobj->swapped, dlcmd->path.offset);
			if (*found_rpath)
				xchrcat(ret, ':', ret_len);
			xstrcat(ret, rpath, ret_len);
			*found_rpath = 1;
		}
	} while (nextloadcmd(lcmd));

	if (be_wewy_wewy_quiet) return;

	if (!*found_rpath && !be_quiet)
		xstrcat(ret, "  -  ", ret_len);
}

static const char *macho_file_needed_lib(
		fatobj *fobj,
		char *found_needed,
		char *found_lib,
		int op,
		char **ret,
		size_t *ret_len
) {
	loadcmd *lcmd;
	uint32_t lc_load_dylib;

	if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
		return NULL;

	lcmd = firstloadcmd(fobj);
	lc_load_dylib = MGET(fobj->swapped, LC_LOAD_DYLIB);

	do {
		if (lcmd->lcmd->cmd == lc_load_dylib) {
			struct dylib_command *dlcmd = lcmd->data;
			char *needed;
			needed = lcmd->data + MGET(fobj->swapped, dlcmd->dylib.name.offset);
			if (op == 0) {
				if (!be_wewy_wewy_quiet) {
					if (*found_needed)
						xchrcat(ret, ',', ret_len);
					xstrcat(ret, needed, ret_len);
				}
				*found_needed = 1;
			} else {
				if (!strncmp(find_lib, needed,
							strlen(!g_match ? needed : find_lib)))
				{
					*found_lib = 1;
					free(lcmd);
					return (be_wewy_wewy_quiet ? NULL : needed);
				}
			}
		}
	} while (nextloadcmd(lcmd));

	if (op == 0 && !*found_needed && be_verbose)
		warn("Mach-O lacks LC_LOAD_DYLIB commands: %s", fobj->filename);

	return NULL;
}

static char *macho_file_interp(fatobj *fobj, char *found_interp)
{
	loadcmd *lcmd;
	uint32_t lc_load_dylinker;

	if (!show_interp)
		return NULL;

	lcmd = firstloadcmd(fobj);
	lc_load_dylinker = MGET(fobj->swapped, LC_LOAD_DYLINKER);

	do {
		if (lcmd->lcmd->cmd == lc_load_dylinker) {
			struct dylinker_command *dlcmd = lcmd->data;
			char *dylinker;
			dylinker = lcmd->data + MGET(fobj->swapped, dlcmd->name.offset);
			*found_interp = 1;
			free(lcmd);
			return (be_wewy_wewy_quiet ? NULL : dylinker);
		}
	} while (nextloadcmd(lcmd));

	return NULL;
}

static char *macho_file_soname(fatobj *fobj, char *found_soname)
{
	loadcmd *lcmd;
	uint32_t lc_id_dylib;

	if (!show_soname)
		return NULL;

	lcmd = firstloadcmd(fobj);
	lc_id_dylib = MGET(fobj->swapped, LC_ID_DYLIB);

	do {
		if (lcmd->lcmd->cmd == lc_id_dylib) {
			struct dylib_command *dlcmd = lcmd->data;
			char *soname;
			soname = lcmd->data + MGET(fobj->swapped, dlcmd->dylib.name.offset);
			*found_soname = 1;
			free(lcmd);
			return (be_wewy_wewy_quiet ? NULL : soname);
		}
	} while (nextloadcmd(lcmd));

	return NULL;
}

/* scan a macho file and show all the fun stuff */
#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
static int scanmacho_fatobj(fatobj *fobj)
{
	unsigned long i;
	char found_rpath, found_needed, found_interp, found_soname,
		 found_lib, found_file;
	static char *out_buffer = NULL;
	static size_t out_len;

	found_rpath = found_needed = found_interp = found_soname = \
	found_lib = found_file = 0;

	if (be_verbose > 2)
		printf("%s: scanning file {%s,%s}\n", fobj->filename,
		       get_machocputype(fobj),
		       get_machosubcputype(fobj));
	else if (be_verbose > 1)
		printf("%s: scanning file\n", fobj->filename);

	/* init output buffer */
	if (!out_buffer) {
		out_len = sizeof(char) * 80;
		out_buffer = xmalloc(out_len);
	}
	*out_buffer = '\0';

	/* show the header */
	if (!be_quiet && show_banner) {
		for (i = 0; out_format[i]; ++i) {
			if (!IS_MODIFIER(out_format[i])) continue;

			switch (out_format[++i]) {
			case '+': break;
			case '%': break;
			case '#': break;
			case 'F':
			case 'p':
			case 'f': prints("FILE "); found_file = 1; break;
			case 'o': prints("  TYPE   "); break;
			case 'M': prints("CPU "); break;
			case 'r': prints("RPATH "); break;
			case 'n': prints("NEEDED "); break;
			case 'i': prints("DYLINKER "); break;
			case 'b': prints("FLAGS "); break;
			case 'Z': prints("SIZE "); break;
			case 'S': prints("INSTALLNAME "); break;
			case 'N': prints("LIB "); break;
			case 'a': prints("ARCH "); break;
			case 'O': prints("PERM "); break;
			case 'D': prints("ENDIAN "); break;
			default: warnf("'%c' has no title ?", out_format[i]);
			}
		}
		if (!found_file) prints("FILE ");
		prints("\n");
		found_file = 0;
		show_banner = 0;
	}

	/* dump all the good stuff */
	for (i = 0; out_format[i]; ++i) {
		const char *out;
		const char *tmp;
		static char ubuf[sizeof(unsigned long)*2];
		if (!IS_MODIFIER(out_format[i])) {
			xchrcat(&out_buffer, out_format[i], &out_len);
			continue;
		}

		out = NULL;
		be_wewy_wewy_quiet = (out_format[i] == '#');
		be_semi_verbose = (out_format[i] == '+');
		switch (out_format[++i]) {
		case '+':
		case '%':
		case '#':
			xchrcat(&out_buffer, out_format[i], &out_len); break;
		case 'F':
			found_file = 1;
			if (be_wewy_wewy_quiet) break;
			xstrcat(&out_buffer, fobj->filename, &out_len);
			break;
		case 'p':
			found_file = 1;
			if (be_wewy_wewy_quiet) break;
			tmp = fobj->filename;
			if (search_path) {
				ssize_t len_search = strlen(search_path);
				ssize_t len_file = strlen(fobj->filename);
				if (!strncmp(fobj->filename, search_path, len_search) && \
				    len_file > len_search)
					tmp += len_search;
				if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
			}
			xstrcat(&out_buffer, tmp, &out_len);
			break;
		case 'f':
			found_file = 1;
			if (be_wewy_wewy_quiet) break;
			xstrcat(&out_buffer, fobj->base_filename, &out_len);
			break;
		case 'r': scanmacho_file_rpath(fobj, &found_rpath, &out_buffer, &out_len); break;
		case 'o': out = get_machomhtype(fobj); break;
		case 'M': out = get_machocputype(fobj); break;
		case 'D': out = get_machoendian(fobj); break;
		case 'O': out = strfileperms(fobj->filename); break;
		case 'n':
		case 'N': out = macho_file_needed_lib(fobj, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
		case 'i': out = macho_file_interp(fobj, &found_interp); break;
		case 'b': get_machomhflags(fobj, &out_buffer, &out_len); break;
		case 'S': out = macho_file_soname(fobj, &found_soname); break;
		case 'a': out = get_machomtype(fobj); break;
		case 'Z': snprintf(ubuf, sizeof(ubuf), "%llu", (unsigned long long int)fobj->len); out = ubuf; break;;
		default: warnf("'%c' has no scan code?", out_format[i]);
		}
		if (out) {
			/* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
			if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
				xstrncat(&out_buffer, out, &out_len, (tmp-out));
			else
				xstrcat(&out_buffer, out, &out_len);
		}
	}

#define FOUND_SOMETHING() \
	(found_rpath || found_needed || found_interp || found_soname || found_lib)

	if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
		xchrcat(&out_buffer, ' ', &out_len);
		xstrcat(&out_buffer, fobj->filename, &out_len);
	}
	if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
		puts(out_buffer);
		fflush(stdout);
	}

	return 0;
}

/* scan a single Mach-O */
static int scanmacho_fat(const char *filename, int fd, size_t len)
{
	int ret = 1;
	fatobj *fobj;
	fatobj *walk;

	/* verify this is real Mach-O */
	if ((fobj = readmacho_fd(filename, fd, len)) == NULL) {
		if (be_verbose > 2) printf("%s: not a Mach-O object\n", filename);
		return ret;
	}
	switch (match_bits) {
		case 32:
		case 64:
			walk = fobj;
			do {
				if ((walk->ismach64 && match_bits == 64) ||
						(!walk->ismach64 && match_bits == 32))
				{
					ret = scanmacho_fatobj(walk);
				}
			} while (walk->next != NULL && (walk = walk->next));
			goto label_done;
		default:
			break;
	}
	if (match_etypes) {
		char sbuf[128];
		char ftype[32];

		snprintf(sbuf, 128, ",%s,", match_etypes);

		walk = fobj;
		do {
			snprintf(ftype, 32, ",%s,", get_machomhtype(walk));
			if (strstr(sbuf, ftype) != NULL) {
				ret = scanmacho_fatobj(walk);
			}
		} while (walk->next != NULL && (walk = walk->next));
		goto label_done;
	}

	walk = fobj;
	do {
		ret = scanmacho_fatobj(walk);
	} while (walk->next != NULL && (walk = walk->next));

label_done:
	unreadmacho(fobj);
	return ret;
}

/* scan an archive of Mach-Os */
static int scanmacho_archive(const char *filename, int fd, size_t len)
{
	archive_handle *ar;
	archive_member *m;
	char *ar_buffer;
	fatobj *fobj;
	fatobj *walk;

	ar = ar_open_fd(filename, fd, be_verbose);
	if (ar == NULL)
		return 1;

	ar_buffer = mmap(0, len, PROT_READ, MAP_PRIVATE, fd, 0);
	while ((m = ar_next(ar)) != NULL) {
		fobj = readmacho_buffer(m->name, ar_buffer + lseek(fd, 0, SEEK_CUR), m->size);
		if (fobj) {
			walk = fobj;
			do {
				scanmacho_fatobj(walk);
			} while (walk->next != NULL && (walk = walk->next));
			fobj->data = NULL;
			unreadmacho(fobj);
		}
	}
	munmap(ar_buffer, len);

	return 0;
}
/* scan a file which may be an Mach-O or an archive or some other
 * magical beast */
static int scanmacho_file(const char *filename, const struct stat *st_cache)
{
	const struct stat *st = st_cache;
	struct stat symlink_st;
	int fd;

	/* always handle regular files and handle symlinked files if no -y */
	if (S_ISLNK(st->st_mode)) {
		if (!scan_symlink)
			return 1;
		if (stat(filename, &symlink_st))
			return 1;
		st = &symlink_st;
	}

	if (!S_ISREG(st->st_mode)) {
		if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
		return 1;
	}

	if (match_perms) {
		if ((st->st_mode | match_perms) != st->st_mode)
			return 1;
	}
	if ((fd = open(filename, O_RDONLY)) == -1)
		return 1;

	if (scanmacho_fat(filename, fd, st->st_size) == 1 && scan_archives)
		/* if it isn't an Mach-O, maybe it's an .a archive */
		scanmacho_archive(filename, fd, st->st_size);

	close(fd);
	return 0;
}

/* scan a directory for Mach-O files and print when we find one */
static int scanmacho_dir(const char *path)
{
	register DIR *dir;
	register struct dirent *dentry;
	struct stat st_top, st;
	char buf[__PAX_UTILS_PATH_MAX];
	size_t pathlen = 0, len = 0;
	int ret = 0;

	/* make sure path exists */
	if (lstat(path, &st_top) == -1) {
		if (be_verbose > 2) printf("%s: does not exist\n", path);
		return 1;
	}

	/* ok, if it isn't a directory, assume we can open it */
	if (!S_ISDIR(st_top.st_mode))
		return scanmacho_file(path, &st_top);

	/* now scan the dir looking for fun stuff */
	if ((dir = opendir(path)) == NULL) {
		warnf("could not opendir %s: %s", path, strerror(errno));
		return 1;
	}
	if (be_verbose > 1) printf("%s: scanning dir\n", path);

	pathlen = strlen(path);
	while ((dentry = readdir(dir))) {
		if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
			continue;
		len = (pathlen + 1 + strlen(dentry->d_name) + 1);
		if (len >= sizeof(buf)) {
			warnf("Skipping '%s': len > sizeof(buf); %zu > %zu",
			      path, len, sizeof(buf));
			continue;
		}
		snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
		if (lstat(buf, &st) != -1) {
			if (S_ISREG(st.st_mode))
				ret = scanmacho_file(buf, &st);
			else if (dir_recurse && S_ISDIR(st.st_mode)) {
				if (dir_crossmount || (st_top.st_dev == st.st_dev))
					ret = scanmacho_dir(buf);
			}
		}
	}
	closedir(dir);
	return ret;
}

static int scanmacho_from_file(const char *filename)
{
	FILE *fp = NULL;
	char *p;
	char path[__PAX_UTILS_PATH_MAX];
	int ret = 0;

	if (strcmp(filename, "-") == 0)
		fp = stdin;
	else if ((fp = fopen(filename, "r")) == NULL)
		return 1;

	while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
		if ((p = strchr(path, '\n')) != NULL)
			*p = 0;
		search_path = path;
		ret = scanmacho_dir(path);
	}
	if (fp != stdin)
		fclose(fp);
	return ret;
}

/* scan env PATH for paths */
static void scanmacho_envpath(void)
{
	char *path, *p;

	path = getenv("PATH");
	if (!path)
		err("PATH is not set in your env !");
	path = xstrdup(path);

	while ((p = strrchr(path, ':')) != NULL) {
		scanmacho_dir(p + 1);
		*p = 0;
	}

	free(path);
}

/* usage / invocation handling functions */ /* Free Flags: c d e j k l s t u w x z G H I J K L P Q T U W X Y */
#define PARSE_FLAGS "pRmyArnibSN:gE:M:DO:ZaqvF:f:o:CBhV"
#define a_argument required_argument
static struct option const long_opts[] = {
	{"path",      no_argument, NULL, 'p'},
	{"recursive", no_argument, NULL, 'R'},
	{"mount",     no_argument, NULL, 'm'},
	{"symlink",   no_argument, NULL, 'y'},
	{"archives",  no_argument, NULL, 'A'},
	{"rpath",     no_argument, NULL, 'r'},
	{"needed",    no_argument, NULL, 'n'},
	{"interp",    no_argument, NULL, 'i'},
	{"bind",      no_argument, NULL, 'b'},
	{"soname",    no_argument, NULL, 'S'},
	{"lib",        a_argument, NULL, 'N'},
	{"gmatch",    no_argument, NULL, 'g'},
	{"etype",      a_argument, NULL, 'E'},
	{"bits",       a_argument, NULL, 'M'},
	{"endian",    no_argument, NULL, 'D'},
	{"perms",      a_argument, NULL, 'O'},
	{"size",      no_argument, NULL, 'Z'},
	{"all",       no_argument, NULL, 'a'},
	{"quiet",     no_argument, NULL, 'q'},
	{"verbose",   no_argument, NULL, 'v'},
	{"format",     a_argument, NULL, 'F'},
	{"from",       a_argument, NULL, 'f'},
	{"file",       a_argument, NULL, 'o'},
	{"nocolor",   no_argument, NULL, 'C'},
	{"nobanner",  no_argument, NULL, 'B'},
	{"help",      no_argument, NULL, 'h'},
	{"version",   no_argument, NULL, 'V'},
	{NULL,        no_argument, NULL, 0x0}
};

static const char * const opts_help[] = {
	"Scan all directories in PATH environment",
	"Scan directories recursively",
	"Don't recursively cross mount points",
	"Don't scan symlinks",
	"Scan archives (.a files)\n",
	"Print LC_RPATH information (ELF: RPATH/RUNPATH)",
	"Print LC_LOAD_DYLIB information (ELF: NEEDED)",
	"Print LC_LOAD_DYLINKER information (ELF: INTERP)",
	"Print flags from mach_header (ELF: BIND)",
	"Print LC_ID_DYLIB information (ELF: SONAME)",
	"Find a specified library",
	"Use strncmp to match libraries. (use with -N)",
	"Print only Mach-O files matching mach_header\n"
		"                        MH_OBJECT,MH_EXECUTE ... (ELF: etype)",
	"Print only Mach-O files matching numeric bits",
	"Print Endianness",
	"Print only Mach-O files matching octal permissions",
	"Print Mach-O file size",
	"Print all useful/simple info\n",
	"Only output 'bad' things",
	"Be verbose (can be specified more than once)",
	"Use specified format for output",
	"Read input stream from a filename",
	"Write output stream to a filename",
	"Don't emit color in output",
	"Don't display the header",
	"Print this help and exit",
	"Print version and exit",
	NULL
};

/* display usage and exit */
static void usage(int status)
{
	unsigned long i;
	printf("* Scan Mach-O binaries for stuff\n\n"
	       "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
	printf("Options: -[%s]\n", PARSE_FLAGS);
	for (i = 0; long_opts[i].name; ++i)
		if (long_opts[i].has_arg == no_argument)
			printf("  -%c, --%-14s* %s\n", long_opts[i].val,
			       long_opts[i].name, opts_help[i]);
		else
			printf("  -%c, --%-7s <arg> * %s\n", long_opts[i].val,
			       long_opts[i].name, opts_help[i]);

	puts("\nFor more information, see the scanmacho(1) manpage");
	exit(status);
}

/* parse command line arguments and preform needed actions */
static int parseargs(int argc, char *argv[])
{
	int i;
	const char *from_file = NULL;
	int ret = 0;

	opterr = 0;
	while ((i = getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
		switch (i) {

		case 'V':
			printf("pax-utils-%s: %s\n"
			       "%s written for Gentoo by <solar, vapier and grobian @ gentoo.org>\n",
			       VERSION, VCSID, argv0);
			exit(EXIT_SUCCESS);
			break;
		case 'h': usage(EXIT_SUCCESS); break;
		case 'f':
			if (from_file) warn("You prob don't want to specify -f twice");
			from_file = optarg;
			break;
		case 'E':
			match_etypes = optarg;
			break;
		case 'M':
			match_bits = atoi(optarg);
			break;
		case 'O':
			if (sscanf(optarg, "%o", &match_perms) == -1)
				match_bits = 0;
			break;
		case 'o': {
			if (freopen(optarg, "w", stdout) == NULL)
				err("Could not open output stream '%s': %s", optarg, strerror(errno));
			break;
		}
		case 'N': {
			if (find_lib) warn("You prob don't want to specify -N twice");
			find_lib = optarg;
			break;
		}
		case 'F': {
			if (out_format) warn("You prob don't want to specify -F twice");
			out_format = optarg;
			break;
		}
		case 'Z': show_size = 1; break;
		case 'g': g_match = 1; break;
		case 'y': scan_symlink = 0; break;
		case 'A': scan_archives = 1; break;
		case 'C': color_init(true); break;
		case 'B': show_banner = 0; break;
		case 'p': scan_envpath = 1; break;
		case 'R': dir_recurse = 1; break;
		case 'm': dir_crossmount = 0; break;
		case 'r': show_rpath = 1; break;
		case 'n': show_needed = 1; break;
		case 'i': show_interp = 1; break;
		case 'b': show_bind = 1; break;
		case 'S': show_soname = 1; break;
		case 'q': be_quiet = 1; break;
		case 'v': be_verbose = (be_verbose % 20) + 1; break;
		case 'a': show_perms = show_endian = show_bind = 1; break;
		case 'D': show_endian = 1; break;
		case ':':
			err("Option '%c' is missing parameter", optopt);
		case '?':
			err("Unknown option '%c' or argument missing", optopt);
		default:
			err("Unhandled option '%c'; please report this", i);
		}
	}
	/* let the format option override all other options */
	if (out_format) {
		show_rpath = show_needed = show_interp = show_bind = show_soname = \
		show_perms = show_endian = show_size = 0;
		for (i = 0; out_format[i]; ++i) {
			if (!IS_MODIFIER(out_format[i])) continue;

			switch (out_format[++i]) {
			case '+': break;
			case '%': break;
			case '#': break;
			case 'F': break;
			case 'p': break;
			case 'f': break;
			case 'k': break;
			case 'N': break;
			case 'o': break;
			case 'a': break;
			case 'M': break;
			case 'Z': show_size = 1; break;
			case 'D': show_endian = 1; break;
			case 'O': show_perms = 1; break;
			case 'r': show_rpath = 1; break;
			case 'n': show_needed = 1; break;
			case 'i': show_interp = 1; break;
			case 'b': show_bind = 1; break;
			case 'S': show_soname = 1; break;
			default:
				err("Invalid format specifier '%c' (byte %i)",
				    out_format[i], i+1);
			}
		}

	/* construct our default format */
	} else {
		size_t fmt_len = 30;
		out_format = xmalloc(sizeof(char) * fmt_len);
		*out_format = '\0';
		if (!be_quiet)     xstrcat(&out_format, "%a ", &fmt_len);
		if (!be_quiet)     xstrcat(&out_format, "%o ", &fmt_len);
		if (show_perms)    xstrcat(&out_format, "%O ", &fmt_len);
		if (show_size)     xstrcat(&out_format, "%Z ", &fmt_len);
		if (show_endian)   xstrcat(&out_format, "%D ", &fmt_len);
		if (show_rpath)    xstrcat(&out_format, "%r ", &fmt_len);
		if (show_needed)   xstrcat(&out_format, "%n ", &fmt_len);
		if (show_interp)   xstrcat(&out_format, "%i ", &fmt_len);
		if (show_bind)     xstrcat(&out_format, "%b ", &fmt_len);
		if (show_soname)   xstrcat(&out_format, "%S ", &fmt_len);
		if (find_lib)      xstrcat(&out_format, "%N ", &fmt_len);
		if (!be_quiet)     xstrcat(&out_format, "%F ", &fmt_len);
	}
	if (be_verbose > 2) printf("Format: %s\n", out_format);

	/* now lets actually do the scanning */
	if (scan_envpath)
		scanmacho_envpath();
	if (!from_file && optind == argc && ttyname(0) == NULL && !scan_envpath)
		from_file = "-";
	if (from_file) {
		scanmacho_from_file(from_file);
		from_file = *argv;
	}
	if (optind == argc && !scan_envpath && !from_file)
		err("Nothing to scan !?");
	while (optind < argc) {
		search_path = argv[optind++];
		ret = scanmacho_dir(search_path);
	}

	return ret;
}

int main(int argc, char *argv[])
{
	int ret;
	security_init(false);
	if (argc < 2)
		usage(EXIT_FAILURE);
	color_init(false);
	ret = parseargs(argc, argv);
	fclose(stdout);
	return ret;
}