summary refs log tree commit diff
path: root/bin/catsh/test.c
blob: a153cdb375211cd4c852a233fa1395c580e545ca (plain) (blame)
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
/*	$NetBSD: test.c,v 1.21 1999/04/05 09:48:38 kleink Exp $	*/

/*-
 * test(1); version 7-like  --  author Erik Baalbergen
 * modified by Eric Gisin to be used as built-in.
 * modified by Arnold Robbins to add SVR3 compatibility
 * (-x -c -b -p -u -g -k) plus Korn's -L -nt -ot -ef and new -S (socket).
 * modified by J.T. Conklin for NetBSD.
 *
 * This program is in the Public Domain.
 */
/*
 * Important: This file is used both as a standalone program /bin/test and
 * as a builtin for /bin/sh (#define SHELL).
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: releng/12.0/bin/test/test.c 298232 2016-04-19 00:38:07Z araujo $");

#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef SHELL
#define main testcmd
#include "bltin.h"
#else
#include <locale.h>

static void error(const char *, ...) __dead2 __printf0like(1, 2);

static void
error(const char *msg, ...)
{
	va_list ap;
	va_start(ap, msg);
	verrx(2, msg, ap);
	/*NOTREACHED*/
	va_end(ap);
}
#endif

/* test(1) accepts the following grammar:
	oexpr	::= aexpr | aexpr "-o" oexpr ;
	aexpr	::= nexpr | nexpr "-a" aexpr ;
	nexpr	::= primary | "!" primary
	primary	::= unary-operator operand
		| operand binary-operator operand
		| operand
		| "(" oexpr ")"
		;
	unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"|
		"-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S";

	binary-operator ::= "="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
			"-nt"|"-ot"|"-ef";
	operand ::= <any legal UNIX file name>
*/

enum token_types {
	UNOP = 0x100,
	BINOP = 0x200,
	BUNOP = 0x300,
	BBINOP = 0x400,
	PAREN = 0x500
};

enum token {
	EOI,
	OPERAND,
	FILRD = UNOP + 1,
	FILWR,
	FILEX,
	FILEXIST,
	FILREG,
	FILDIR,
	FILCDEV,
	FILBDEV,
	FILFIFO,
	FILSOCK,
	FILSYM,
	FILGZ,
	FILTT,
	FILSUID,
	FILSGID,
	FILSTCK,
	STREZ,
	STRNZ,
	FILUID,
	FILGID,
	FILNT = BINOP + 1,
	FILOT,
	FILEQ,
	STREQ,
	STRNE,
	STRLT,
	STRGT,
	INTEQ,
	INTNE,
	INTGE,
	INTGT,
	INTLE,
	INTLT,
	UNOT = BUNOP + 1,
	BAND = BBINOP + 1,
	BOR,
	LPAREN = PAREN + 1,
	RPAREN
};

#define TOKEN_TYPE(token) ((token) & 0xff00)

static const struct t_op {
	char op_text[2];
	short op_num;
} ops1[] = {
	{"=",	STREQ},
	{"<",	STRLT},
	{">",	STRGT},
	{"!",	UNOT},
	{"(",	LPAREN},
	{")",	RPAREN},
}, opsm1[] = {
	{"r",	FILRD},
	{"w",	FILWR},
	{"x",	FILEX},
	{"e",	FILEXIST},
	{"f",	FILREG},
	{"d",	FILDIR},
	{"c",	FILCDEV},
	{"b",	FILBDEV},
	{"p",	FILFIFO},
	{"u",	FILSUID},
	{"g",	FILSGID},
	{"k",	FILSTCK},
	{"s",	FILGZ},
	{"t",	FILTT},
	{"z",	STREZ},
	{"n",	STRNZ},
	{"h",	FILSYM},		/* for backwards compat */
	{"O",	FILUID},
	{"G",	FILGID},
	{"L",	FILSYM},
	{"S",	FILSOCK},
	{"a",	BAND},
	{"o",	BOR},
}, ops2[] = {
	{"==",	STREQ},
	{"!=",	STRNE},
}, opsm2[] = {
	{"eq",	INTEQ},
	{"ne",	INTNE},
	{"ge",	INTGE},
	{"gt",	INTGT},
	{"le",	INTLE},
	{"lt",	INTLT},
	{"nt",	FILNT},
	{"ot",	FILOT},
	{"ef",	FILEQ},
};

static int nargc;
static char **t_wp;
static int parenlevel;

static int	aexpr(enum token);
static int	binop(enum token);
static int	equalf(const char *, const char *);
static int	filstat(char *, enum token);
static int	getn(const char *);
static intmax_t	getq(const char *);
static int	intcmp(const char *, const char *);
static int	isunopoperand(void);
static int	islparenoperand(void);
static int	isrparenoperand(void);
static int	newerf(const char *, const char *);
static int	nexpr(enum token);
static int	oexpr(enum token);
static int	olderf(const char *, const char *);
static int	primary(enum token);
static void	syntax(const char *, const char *);
static enum	token t_lex(char *);

int
main(int argc, char **argv)
{
	int	res;
	char	*p;

	if ((p = strrchr(argv[0], '/')) == NULL)
		p = argv[0];
	else
		p++;
	if (strcmp(p, "[") == 0) {
		if (strcmp(argv[--argc], "]") != 0)
			error("missing ]");
		argv[argc] = NULL;
	}

	/* no expression => false */
	if (--argc <= 0)
		return 1;

#ifndef SHELL
	(void)setlocale(LC_CTYPE, "");
#endif
	nargc = argc;
	t_wp = &argv[1];
	parenlevel = 0;
	if (nargc == 4 && strcmp(*t_wp, "!") == 0) {
		/* Things like ! "" -o x do not fit in the normal grammar. */
		--nargc;
		++t_wp;
		res = oexpr(t_lex(*t_wp));
	} else
		res = !oexpr(t_lex(*t_wp));

	if (--nargc > 0)
		syntax(*t_wp, "unexpected operator");

	return res;
}

static void
syntax(const char *op, const char *msg)
{

	if (op && *op)
		error("%s: %s", op, msg);
	else
		error("%s", msg);
}

static int
oexpr(enum token n)
{
	int res;

	res = aexpr(n);
	if (t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL) == BOR)
		return oexpr(t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL)) ||
		    res;
	t_wp--;
	nargc++;
	return res;
}

static int
aexpr(enum token n)
{
	int res;

	res = nexpr(n);
	if (t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL) == BAND)
		return aexpr(t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL)) &&
		    res;
	t_wp--;
	nargc++;
	return res;
}

static int
nexpr(enum token n)
{
	if (n == UNOT)
		return !nexpr(t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL));
	return primary(n);
}

static int
primary(enum token n)
{
	enum token nn;
	int res;

	if (n == EOI)
		return 0;		/* missing expression */
	if (n == LPAREN) {
		parenlevel++;
		if ((nn = t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL)) ==
		    RPAREN) {
			parenlevel--;
			return 0;	/* missing expression */
		}
		res = oexpr(nn);
		if (t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL) != RPAREN)
			syntax(NULL, "closing paren expected");
		parenlevel--;
		return res;
	}
	if (TOKEN_TYPE(n) == UNOP) {
		/* unary expression */
		if (--nargc == 0)
			syntax(NULL, "argument expected"); /* impossible */
		switch (n) {
		case STREZ:
			return strlen(*++t_wp) == 0;
		case STRNZ:
			return strlen(*++t_wp) != 0;
		case FILTT:
			return isatty(getn(*++t_wp));
		default:
			return filstat(*++t_wp, n);
		}
	}

	nn = t_lex(nargc > 0 ? t_wp[1] : NULL);
	if (TOKEN_TYPE(nn) == BINOP)
		return binop(nn);

	return strlen(*t_wp) > 0;
}

static int
binop(enum token n)
{
	const char *opnd1, *op, *opnd2;

	opnd1 = *t_wp;
	op = nargc > 0 ? (--nargc, *++t_wp) : NULL;

	if ((opnd2 = nargc > 0 ? (--nargc, *++t_wp) : NULL) == NULL)
		syntax(op, "argument expected");

	switch (n) {
	case STREQ:
		return strcmp(opnd1, opnd2) == 0;
	case STRNE:
		return strcmp(opnd1, opnd2) != 0;
	case STRLT:
		return strcmp(opnd1, opnd2) < 0;
	case STRGT:
		return strcmp(opnd1, opnd2) > 0;
	case INTEQ:
		return intcmp(opnd1, opnd2) == 0;
	case INTNE:
		return intcmp(opnd1, opnd2) != 0;
	case INTGE:
		return intcmp(opnd1, opnd2) >= 0;
	case INTGT:
		return intcmp(opnd1, opnd2) > 0;
	case INTLE:
		return intcmp(opnd1, opnd2) <= 0;
	case INTLT:
		return intcmp(opnd1, opnd2) < 0;
	case FILNT:
		return newerf (opnd1, opnd2);
	case FILOT:
		return olderf (opnd1, opnd2);
	case FILEQ:
		return equalf (opnd1, opnd2);
	default:
		abort();
		/* NOTREACHED */
	}
}

static int
filstat(char *nm, enum token mode)
{
	struct stat s;

	if (mode == FILSYM ? lstat(nm, &s) : stat(nm, &s))
		return 0;

	switch (mode) {
	case FILRD:
		return (faccessat(AT_FDCWD, nm, R_OK, AT_EACCESS) == 0);
	case FILWR:
		return (faccessat(AT_FDCWD, nm, W_OK, AT_EACCESS) == 0);
	case FILEX:
		/* XXX work around eaccess(2) false positives for superuser */
		if (faccessat(AT_FDCWD, nm, X_OK, AT_EACCESS) != 0)
			return 0;
		if (S_ISDIR(s.st_mode) || geteuid() != 0)
			return 1;
		return (s.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0;
	case FILEXIST:
		return (faccessat(AT_FDCWD, nm, F_OK, AT_EACCESS) == 0);
	case FILREG:
		return S_ISREG(s.st_mode);
	case FILDIR:
		return S_ISDIR(s.st_mode);
	case FILCDEV:
		return S_ISCHR(s.st_mode);
	case FILBDEV:
		return S_ISBLK(s.st_mode);
	case FILFIFO:
		return S_ISFIFO(s.st_mode);
	case FILSOCK:
		return S_ISSOCK(s.st_mode);
	case FILSYM:
		return S_ISLNK(s.st_mode);
	case FILSUID:
		return (s.st_mode & S_ISUID) != 0;
	case FILSGID:
		return (s.st_mode & S_ISGID) != 0;
	case FILSTCK:
		return (s.st_mode & S_ISVTX) != 0;
	case FILGZ:
		return s.st_size > (off_t)0;
	case FILUID:
		return s.st_uid == geteuid();
	case FILGID:
		return s.st_gid == getegid();
	default:
		return 1;
	}
}

static int
find_op_1char(const struct t_op *op, const struct t_op *end, const char *s)
{
	char c;

	c = s[0];
	while (op != end) {
		if (c == *op->op_text)
			return op->op_num;
		op++;
	}
	return OPERAND;
}

static int
find_op_2char(const struct t_op *op, const struct t_op *end, const char *s)
{
	while (op != end) {
		if (s[0] == op->op_text[0] && s[1] == op->op_text[1])
			return op->op_num;
		op++;
	}
	return OPERAND;
}

static int
find_op(const char *s)
{
	if (s[0] == '\0')
		return OPERAND;
	else if (s[1] == '\0')
		return find_op_1char(ops1, (&ops1)[1], s);
	else if (s[2] == '\0')
		return s[0] == '-' ? find_op_1char(opsm1, (&opsm1)[1], s + 1) :
		    find_op_2char(ops2, (&ops2)[1], s);
	else if (s[3] == '\0')
		return s[0] == '-' ? find_op_2char(opsm2, (&opsm2)[1], s + 1) :
		    OPERAND;
	else
		return OPERAND;
}

static enum token
t_lex(char *s)
{
	int num;

	if (s == NULL) {
		return EOI;
	}
	num = find_op(s);
	if (((TOKEN_TYPE(num) == UNOP || TOKEN_TYPE(num) == BUNOP)
				&& isunopoperand()) ||
	    (num == LPAREN && islparenoperand()) ||
	    (num == RPAREN && isrparenoperand()))
		return OPERAND;
	return num;
}

static int
isunopoperand(void)
{
	char *s;
	char *t;
	int num;

	if (nargc == 1)
		return 1;
	s = *(t_wp + 1);
	if (nargc == 2)
		return parenlevel == 1 && strcmp(s, ")") == 0;
	t = *(t_wp + 2);
	num = find_op(s);
	return TOKEN_TYPE(num) == BINOP &&
	    (parenlevel == 0 || t[0] != ')' || t[1] != '\0');
}

static int
islparenoperand(void)
{
	char *s;
	int num;

	if (nargc == 1)
		return 1;
	s = *(t_wp + 1);
	if (nargc == 2)
		return parenlevel == 1 && strcmp(s, ")") == 0;
	if (nargc != 3)
		return 0;
	num = find_op(s);
	return TOKEN_TYPE(num) == BINOP;
}

static int
isrparenoperand(void)
{
	char *s;

	if (nargc == 1)
		return 0;
	s = *(t_wp + 1);
	if (nargc == 2)
		return parenlevel == 1 && strcmp(s, ")") == 0;
	return 0;
}

/* atoi with error detection */
static int
getn(const char *s)
{
	char *p;
	long r;

	errno = 0;
	r = strtol(s, &p, 10);

	if (s == p)
		error("%s: bad number", s);

	if (errno != 0)
		error((errno == EINVAL) ? "%s: bad number" :
					  "%s: out of range", s);

	while (isspace((unsigned char)*p))
		p++;

	if (*p)
		error("%s: bad number", s);

	return (int) r;
}

/* atoi with error detection and 64 bit range */
static intmax_t
getq(const char *s)
{
	char *p;
	intmax_t r;

	errno = 0;
	r = strtoimax(s, &p, 10);

	if (s == p)
		error("%s: bad number", s);

	if (errno != 0)
		error((errno == EINVAL) ? "%s: bad number" :
					  "%s: out of range", s);

	while (isspace((unsigned char)*p))
		p++;

	if (*p)
		error("%s: bad number", s);

	return r;
}

static int
intcmp (const char *s1, const char *s2)
{
	intmax_t q1, q2;


	q1 = getq(s1);
	q2 = getq(s2);

	if (q1 > q2)
		return 1;

	if (q1 < q2)
		return -1;

	return 0;
}

static int
newerf (const char *f1, const char *f2)
{
	struct stat b1, b2;

	if (stat(f1, &b1) != 0 || stat(f2, &b2) != 0)
		return 0;

	if (b1.st_mtimespec.tv_sec > b2.st_mtimespec.tv_sec)
		return 1;
	if (b1.st_mtimespec.tv_sec < b2.st_mtimespec.tv_sec)
		return 0;

       return (b1.st_mtimespec.tv_nsec > b2.st_mtimespec.tv_nsec);
}

static int
olderf (const char *f1, const char *f2)
{
	return (newerf(f2, f1));
}

static int
equalf (const char *f1, const char *f2)
{
	struct stat b1, b2;

	return (stat (f1, &b1) == 0 &&
		stat (f2, &b2) == 0 &&
		b1.st_dev == b2.st_dev &&
		b1.st_ino == b2.st_ino);
}