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
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
|
/* vi: set sw=4 ts=4: */
/*
* test implementation for busybox
*
* Copyright (c) by a whole pile of folks:
*
* 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.
* modified by Herbert Xu to be used as built-in in ash.
* modified by Erik Andersen <andersen@codepoet.org> to be used
* in busybox.
* modified by Bernhard Reutner-Fischer to be useable (i.e. a bit less bloaty).
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
* Original copyright notice states:
* "This program is in the Public Domain."
*/
//config:config TEST
//config: bool "test (4.1 kb)"
//config: default y
//config: help
//config: test is used to check file types and compare values,
//config: returning an appropriate exit code. The bash shell
//config: has test built in, ash can build it in optionally.
//config:
//config:config TEST1
//config: bool "test as ["
//config: default y
//config: help
//config: Provide test command in the "[ EXPR ]" form
//config:
//config:config TEST2
//config: bool "test as [["
//config: default y
//config: help
//config: Provide test command in the "[[ EXPR ]]" form
//config:
//config:config FEATURE_TEST_64
//config: bool "Extend test to 64 bit"
//config: default y
//config: depends on TEST || TEST1 || TEST2 || ASH_TEST || HUSH_TEST
//config: help
//config: Enable 64-bit support in test.
//applet:IF_TEST(APPLET_NOFORK(test, test, BB_DIR_USR_BIN, BB_SUID_DROP, test))
//applet:IF_TEST1(APPLET_NOFORK([, test, BB_DIR_USR_BIN, BB_SUID_DROP, test))
//applet:IF_TEST2(APPLET_NOFORK([[, test, BB_DIR_USR_BIN, BB_SUID_DROP, test))
//kbuild:lib-$(CONFIG_TEST) += test.o test_ptr_hack.o
//kbuild:lib-$(CONFIG_TEST1) += test.o test_ptr_hack.o
//kbuild:lib-$(CONFIG_TEST2) += test.o test_ptr_hack.o
//kbuild:lib-$(CONFIG_ASH_TEST) += test.o test_ptr_hack.o
//kbuild:lib-$(CONFIG_HUSH_TEST) += test.o test_ptr_hack.o
/* "test --help" is special-cased to ignore --help */
//usage:#define test_trivial_usage NOUSAGE_STR
//usage:#define test_full_usage ""
//usage:
//usage:#define test_example_usage
//usage: "$ test 1 -eq 2\n"
//usage: "$ echo $?\n"
//usage: "1\n"
//usage: "$ test 1 -eq 1\n"
//usage: "$ echo $?\n"
//usage: "0\n"
//usage: "$ [ -d /etc ]\n"
//usage: "$ echo $?\n"
//usage: "0\n"
//usage: "$ [ -d /junk ]\n"
//usage: "$ echo $?\n"
//usage: "1\n"
#include "libbb.h"
#include <regex.h>
#include <fnmatch.h>
/* This is a NOFORK applet. Be very careful! */
/* test_main() is called from shells, and we need to be extra careful here.
* This is true regardless of PREFER_APPLETS and SH_STANDALONE
* state. */
/* 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>
*/
/* TODO: handle [[ expr ]] bashism bash-compatibly.
* [[ ]] is meant to be a "better [ ]", with less weird syntax
* and without the risk of variables and quoted strings misinterpreted
* as operators.
* This will require support from shells - we need to know quote status
* of each parameter (see below).
*
* Word splitting and pathname expansion should NOT be performed:
* # a="a b"; [[ $a = "a b" ]] && echo YES
* YES
* # [[ /bin/m* ]] && echo YES
* YES
*
* =~ should do regexp match
* = and == should do pattern match against right side:
* # [[ *a* == bab ]] && echo YES
* # [[ bab == *a* ]] && echo YES
* YES
* != does the negated == (i.e., also with pattern matching).
* Pattern matching is quotation-sensitive:
* # [[ bab == "b"a* ]] && echo YES
* YES
* # [[ bab == b"a*" ]] && echo YES
*
* Conditional operators such as -f must be unquoted literals to be recognized:
* # [[ -e /bin ]] && echo YES
* YES
* # [[ '-e' /bin ]] && echo YES
* bash: conditional binary operator expected...
* # A='-e'; [[ $A /bin ]] && echo YES
* bash: conditional binary operator expected...
*
* || and && should work as -o and -a work in [ ]
* -a and -o aren't recognized (&& and || are to be used instead)
* ( and ) do not need to be quoted unlike in [ ]:
* # [[ ( abc ) && '' ]] && echo YES
* # [[ ( abc ) || '' ]] && echo YES
* YES
* # [[ ( abc ) -o '' ]] && echo YES
* bash: syntax error in conditional expression...
*
* Apart from the above, [[ expr ]] should work as [ expr ]
*/
#define TEST_DEBUG 0
#if ENABLE_TEST2 \
|| (ENABLE_ASH_BASH_COMPAT && ENABLE_ASH_TEST) \
|| (ENABLE_HUSH_BASH_COMPAT && ENABLE_HUSH_TEST)
# define BASH_TEST2 1
#else
# define BASH_TEST2 0
#endif
enum token {
EOI,
FILRD, /* file access */
FILWR,
FILEX,
FILEXIST,
FILREG, /* file type */
FILDIR,
FILCDEV,
FILBDEV,
FILFIFO,
FILSOCK,
FILSYM,
FILGZ,
FILTT,
FILSUID, /* file bit */
FILSGID,
FILSTCK,
FILNT, /* file ops */
FILOT,
FILEQ,
FILUID,
FILGID,
STREZ, /* str ops */
STRNZ,
STREQ,
STRNE,
STRLT,
STRGT,
#if BASH_TEST2
REGEX,
#endif
INTEQ, /* int ops */
INTNE,
INTGE,
INTGT,
INTLE,
INTLT,
UNOT,
BAND,
BOR,
LPAREN,
RPAREN,
OPERAND
};
#define is_int_op(a) (((unsigned char)((a) - INTEQ)) <= 5)
#define is_str_op(a) (((unsigned char)((a) - STREZ)) <= 5)
#define is_file_op(a) (((unsigned char)((a) - FILNT)) <= 2)
#define is_file_access(a) (((unsigned char)((a) - FILRD)) <= 2)
#define is_file_type(a) (((unsigned char)((a) - FILREG)) <= 5)
#define is_file_bit(a) (((unsigned char)((a) - FILSUID)) <= 2)
#if TEST_DEBUG
int depth;
#define nest_msg(...) do { \
depth++; \
fprintf(stderr, "%*s", depth*2, ""); \
fprintf(stderr, __VA_ARGS__); \
} while (0)
#define unnest_msg(...) do { \
fprintf(stderr, "%*s", depth*2, ""); \
fprintf(stderr, __VA_ARGS__); \
depth--; \
} while (0)
#define dbg_msg(...) do { \
fprintf(stderr, "%*s", depth*2, ""); \
fprintf(stderr, __VA_ARGS__); \
} while (0)
#define unnest_msg_and_return(expr, ...) do { \
number_t __res = (expr); \
fprintf(stderr, "%*s", depth*2, ""); \
fprintf(stderr, __VA_ARGS__, res); \
depth--; \
return __res; \
} while (0)
static const char *const TOKSTR[] ALIGN_PTR = {
"EOI",
"FILRD",
"FILWR",
"FILEX",
"FILEXIST",
"FILREG",
"FILDIR",
"FILCDEV",
"FILBDEV",
"FILFIFO",
"FILSOCK",
"FILSYM",
"FILGZ",
"FILTT",
"FILSUID",
"FILSGID",
"FILSTCK",
"FILNT",
"FILOT",
"FILEQ",
"FILUID",
"FILGID",
"STREZ",
"STRNZ",
"STREQ",
"STRNE",
"STRLT",
"STRGT",
#if BASH_TEST2
"REGEX",
#endif
"INTEQ",
"INTNE",
"INTGE",
"INTGT",
"INTLE",
"INTLT",
"UNOT",
"BAND",
"BOR",
"LPAREN",
"RPAREN",
"OPERAND"
};
#else
#define nest_msg(...) ((void)0)
#define unnest_msg(...) ((void)0)
#define dbg_msg(...) ((void)0)
#define unnest_msg_and_return(expr, ...) return expr
#endif
enum {
UNOP,
BINOP,
BUNOP,
BBINOP,
PAREN
};
struct operator_t {
unsigned char op_num, op_type;
};
static const struct operator_t ops_table[] ALIGN2 = {
{ /* "-r" */ FILRD , UNOP },
{ /* "-w" */ FILWR , UNOP },
{ /* "-x" */ FILEX , UNOP },
{ /* "-e" */ FILEXIST, UNOP },
{ /* "-f" */ FILREG , UNOP },
{ /* "-d" */ FILDIR , UNOP },
{ /* "-c" */ FILCDEV , UNOP },
{ /* "-b" */ FILBDEV , UNOP },
{ /* "-p" */ FILFIFO , UNOP },
{ /* "-u" */ FILSUID , UNOP },
{ /* "-g" */ FILSGID , UNOP },
{ /* "-k" */ FILSTCK , UNOP },
{ /* "-s" */ FILGZ , UNOP },
{ /* "-t" */ FILTT , UNOP },
{ /* "-z" */ STREZ , UNOP },
{ /* "-n" */ STRNZ , UNOP },
{ /* "-h" */ FILSYM , UNOP }, /* for backwards compat */
{ /* "-O" */ FILUID , UNOP },
{ /* "-G" */ FILGID , UNOP },
{ /* "-L" */ FILSYM , UNOP },
{ /* "-S" */ FILSOCK , UNOP },
{ /* "=" */ STREQ , BINOP },
/* "==" is bashism, http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html
* lists only "=" as comparison operator.
*/
{ /* "==" */ STREQ , BINOP },
{ /* "!=" */ STRNE , BINOP },
{ /* "<" */ STRLT , BINOP },
{ /* ">" */ STRGT , BINOP },
#if BASH_TEST2
{ /* "=~" */ REGEX , BINOP },
#endif
{ /* "-eq"*/ INTEQ , BINOP },
{ /* "-ne"*/ INTNE , BINOP },
{ /* "-ge"*/ INTGE , BINOP },
{ /* "-gt"*/ INTGT , BINOP },
{ /* "-le"*/ INTLE , BINOP },
{ /* "-lt"*/ INTLT , BINOP },
{ /* "-nt"*/ FILNT , BINOP },
{ /* "-ot"*/ FILOT , BINOP },
{ /* "-ef"*/ FILEQ , BINOP },
{ /* "!" */ UNOT , BUNOP },
{ /* "-a" */ BAND , BBINOP },
{ /* "-o" */ BOR , BBINOP },
#if BASH_TEST2
{ /* "&&" */ BAND , BBINOP },
{ /* "||" */ BOR , BBINOP },
#endif
{ /* "(" */ LPAREN , PAREN },
{ /* ")" */ RPAREN , PAREN },
};
/* Please keep these two tables in sync */
static const char ops_texts[] ALIGN1 =
"-r" "\0"
"-w" "\0"
"-x" "\0"
"-e" "\0"
"-f" "\0"
"-d" "\0"
"-c" "\0"
"-b" "\0"
"-p" "\0"
"-u" "\0"
"-g" "\0"
"-k" "\0"
"-s" "\0"
"-t" "\0"
"-z" "\0"
"-n" "\0"
"-h" "\0"
"-O" "\0"
"-G" "\0"
"-L" "\0"
"-S" "\0"
"=" "\0"
/* "==" is bashism */
"==" "\0"
"!=" "\0"
"<" "\0"
">" "\0"
#if BASH_TEST2
"=~" "\0"
#endif
"-eq" "\0"
"-ne" "\0"
"-ge" "\0"
"-gt" "\0"
"-le" "\0"
"-lt" "\0"
"-nt" "\0"
"-ot" "\0"
"-ef" "\0"
"!" "\0"
"-a" "\0"
"-o" "\0"
#if BASH_TEST2
"&&" "\0"
"||" "\0"
#endif
"(" "\0"
")" "\0"
;
#if ENABLE_FEATURE_TEST_64
typedef int64_t number_t;
#else
typedef int number_t;
#endif
/* We try to minimize both static and stack usage. */
struct test_statics {
char **args;
/* set only by check_operator(), either to bogus struct
* or points to matching operator_t struct. Never NULL. */
const struct operator_t *last_operator;
gid_t *group_array;
int ngroups;
#if BASH_TEST2
bool bash_test2;
#endif
jmp_buf leaving;
};
/* See test_ptr_hack.c */
extern struct test_statics *BB_GLOBAL_CONST test_ptr_to_statics;
#define S (*test_ptr_to_statics)
#define args (S.args )
#define last_operator (S.last_operator)
#define group_array (S.group_array )
#define ngroups (S.ngroups )
#define bash_test2 (S.bash_test2 )
#define leaving (S.leaving )
#define INIT_S() do { \
XZALLOC_CONST_PTR(&test_ptr_to_statics, sizeof(S)); \
} while (0)
#define DEINIT_S() do { \
free(group_array); \
free(test_ptr_to_statics); \
} while (0)
static number_t primary(enum token n);
static void syntax(const char *op, const char *msg) NORETURN;
static void syntax(const char *op, const char *msg)
{
if (op && *op) {
bb_error_msg("%s: %s", op, msg);
} else {
bb_error_msg("%s: %s"+4, msg);
}
longjmp(leaving, 2);
}
/* atoi with error detection */
//XXX: FIXME: duplicate of existing libbb function?
static number_t getn(const char *s)
{
char *p;
#if ENABLE_FEATURE_TEST_64
long long r;
#else
long r;
#endif
errno = 0;
#if ENABLE_FEATURE_TEST_64
r = strtoll(s, &p, 10);
#else
r = strtol(s, &p, 10);
#endif
if (errno != 0)
syntax(s, "out of range");
if (p == s || *(skip_whitespace(p)) != '\0')
syntax(s, "bad number");
return r;
}
/* UNUSED
static int newerf(const char *f1, const char *f2)
{
struct stat b1, b2;
return (stat(f1, &b1) == 0 &&
stat(f2, &b2) == 0 && b1.st_mtime > b2.st_mtime);
}
static int olderf(const char *f1, const char *f2)
{
struct stat b1, b2;
return (stat(f1, &b1) == 0 &&
stat(f2, &b2) == 0 && b1.st_mtime < b2.st_mtime);
}
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);
}
*/
static enum token check_operator(const char *s)
{
static const struct operator_t no_op = {
.op_num = -1,
.op_type = -1
};
int n;
last_operator = &no_op;
if (s == NULL)
return EOI;
n = index_in_strings(ops_texts, s);
if (n < 0)
return OPERAND;
#if BASH_TEST2
if (ops_table[n].op_num == REGEX && !bash_test2) {
/* =~ is only for [[ ]] */
return OPERAND;
}
if (ops_table[n].op_num == BAND || ops_table[n].op_num == BOR) {
/* [ ] accepts -a and -o but not && and || */
/* [[ ]] accepts && and || but not -a and -o */
if (bash_test2 == (s[0] == '-'))
return OPERAND;
}
#endif
last_operator = &ops_table[n];
return ops_table[n].op_num;
}
static int binop(void)
{
const char *opnd1, *opnd2;
const struct operator_t *op;
number_t val1, val2;
opnd1 = *args;
check_operator(*++args);
op = last_operator;
opnd2 = *++args;
if (opnd2 == NULL)
syntax(args[-1], "argument expected");
if (is_int_op(op->op_num)) {
val1 = getn(opnd1);
val2 = getn(opnd2);
if (op->op_num == INTEQ)
return val1 == val2;
if (op->op_num == INTNE)
return val1 != val2;
if (op->op_num == INTGE)
return val1 >= val2;
if (op->op_num == INTGT)
return val1 > val2;
if (op->op_num == INTLE)
return val1 <= val2;
/*if (op->op_num == INTLT)*/
return val1 < val2;
}
#if BASH_TEST2
if (bash_test2) {
if (op->op_num == STREQ) {
val1 = fnmatch(opnd2, opnd1, 0);
return val1 == 0;
}
if (op->op_num == STRNE) {
val1 = fnmatch(opnd2, opnd1, 0);
return val1 != 0;
}
if (op->op_num == REGEX) {
regex_t re_buffer;
memset(&re_buffer, 0, sizeof(re_buffer));
if (regcomp(&re_buffer, opnd2, REG_EXTENDED)) { // REG_NEWLINE?
/* Bad regex */
longjmp(leaving, 2); /* [[ a =~ * ]]; echo $? - prints 2 (silently, no error msg) */
}
val1 = regexec(&re_buffer, opnd1, 0, NULL, 0);
regfree(&re_buffer);
return val1 == 0;
}
}
#endif
if (is_str_op(op->op_num)) {
val1 = strcmp(opnd1, opnd2);
if (op->op_num == STREQ)
return val1 == 0;
if (op->op_num == STRNE)
return val1 != 0;
if (op->op_num == STRLT)
return val1 < 0;
/*if (op->op_num == STRGT)*/
return val1 > 0;
}
/* We are sure that these three are by now the only binops we didn't check
* yet, so we do not check if the class is correct:
*/
/* if (is_file_op(op->op_num)) */
{
struct stat b1, b2;
if (stat(opnd1, &b1) || stat(opnd2, &b2))
return 0; /* false, since at least one stat failed */
if (op->op_num == FILNT)
return b1.st_mtime > b2.st_mtime;
if (op->op_num == FILOT)
return b1.st_mtime < b2.st_mtime;
/*if (op->op_num == FILEQ)*/
return b1.st_dev == b2.st_dev && b1.st_ino == b2.st_ino;
}
/*return 1; - NOTREACHED */
}
static void initialize_group_array(void)
{
group_array = bb_getgroups(&ngroups, NULL);
}
/* Return non-zero if GID is one that we have in our groups list. */
//XXX: FIXME: duplicate of existing libbb function?
// see toplevel TODO file:
// possible code duplication ingroup() and is_a_group_member()
static int is_a_group_member(gid_t gid)
{
int i;
/* Short-circuit if possible, maybe saving a call to getgroups(). */
if (gid == getgid() || gid == getegid())
return 1;
if (ngroups == 0)
initialize_group_array();
/* Search through the list looking for GID. */
for (i = 0; i < ngroups; i++)
if (gid == group_array[i])
return 1;
return 0;
}
/* Do the same thing access(2) does, but use the effective uid and gid,
and don't make the mistake of telling root that any file is
executable. */
static int test_eaccess(struct stat *st, int mode)
{
unsigned int euid = geteuid();
if (euid == 0) {
/* Root can read or write any file. */
if (mode != X_OK)
return 0;
/* Root can execute any file that has any one of the execute
* bits set. */
if (st->st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
return 0;
}
if (st->st_uid == euid) /* owner */
mode <<= 6;
else if (is_a_group_member(st->st_gid))
mode <<= 3;
if (st->st_mode & mode)
return 0;
return -1;
}
static int filstat(char *nm, enum token mode)
{
struct stat s;
unsigned i = i; /* gcc 3.x thinks it can be used uninitialized */
if (mode == FILSYM) {
#ifdef S_IFLNK
if (lstat(nm, &s) == 0) {
i = S_IFLNK;
goto filetype;
}
#endif
return 0;
}
if (stat(nm, &s) != 0)
return 0;
if (mode == FILEXIST)
return 1;
if (is_file_access(mode)) {
if (mode == FILRD)
i = R_OK;
if (mode == FILWR)
i = W_OK;
if (mode == FILEX)
i = X_OK;
return test_eaccess(&s, i) == 0;
}
if (is_file_type(mode)) {
if (mode == FILREG)
i = S_IFREG;
if (mode == FILDIR)
i = S_IFDIR;
if (mode == FILCDEV)
i = S_IFCHR;
if (mode == FILBDEV)
i = S_IFBLK;
if (mode == FILFIFO) {
#ifdef S_IFIFO
i = S_IFIFO;
#else
return 0;
#endif
}
if (mode == FILSOCK) {
#ifdef S_IFSOCK
i = S_IFSOCK;
#else
return 0;
#endif
}
filetype:
return ((s.st_mode & S_IFMT) == i);
}
if (is_file_bit(mode)) {
if (mode == FILSUID)
i = S_ISUID;
if (mode == FILSGID)
i = S_ISGID;
if (mode == FILSTCK)
i = S_ISVTX;
return ((s.st_mode & i) != 0);
}
if (mode == FILGZ)
return s.st_size > 0L;
if (mode == FILUID)
return s.st_uid == geteuid();
if (mode == FILGID)
return s.st_gid == getegid();
return 1; /* NOTREACHED */
}
static number_t nexpr(enum token n)
{
number_t res;
nest_msg(">nexpr(%s)\n", TOKSTR[n]);
if (n == UNOT) {
n = check_operator(*++args);
if (n == EOI) {
/* special case: [ ! ], [ a -a ! ] are valid */
/* IOW, "! ARG" may miss ARG */
args--;
unnest_msg("<nexpr:1 (!EOI), args:%s(%p)\n", args[0], &args[0]);
return 1;
}
res = !nexpr(n);
unnest_msg("<nexpr:%lld\n", res);
return res;
}
res = primary(n);
unnest_msg("<nexpr:%lld\n", res);
return res;
}
static number_t aexpr(enum token n)
{
number_t res;
nest_msg(">aexpr(%s)\n", TOKSTR[n]);
res = nexpr(n);
dbg_msg("aexpr: nexpr:%lld, next args:%s(%p)\n", res, args[1], &args[1]);
if (check_operator(*++args) == BAND) {
dbg_msg("aexpr: arg is AND, next args:%s(%p)\n", args[1], &args[1]);
res = aexpr(check_operator(*++args)) && res;
unnest_msg("<aexpr:%lld\n", res);
return res;
}
args--;
unnest_msg("<aexpr:%lld, args:%s(%p)\n", res, args[0], &args[0]);
return res;
}
static number_t oexpr(enum token n)
{
number_t res;
nest_msg(">oexpr(%s)\n", TOKSTR[n]);
res = aexpr(n);
dbg_msg("oexpr: aexpr:%lld, next args:%s(%p)\n", res, args[1], &args[1]);
if (check_operator(*++args) == BOR) {
dbg_msg("oexpr: next arg is OR, next args:%s(%p)\n", args[1], &args[1]);
res = oexpr(check_operator(*++args)) || res;
unnest_msg("<oexpr:%lld\n", res);
return res;
}
args--;
unnest_msg("<oexpr:%lld, args:%s(%p)\n", res, args[0], &args[0]);
return res;
}
static number_t primary(enum token n)
{
#if TEST_DEBUG
number_t res = res; /* for compiler */
#else
number_t res;
#endif
const struct operator_t *args0_op;
nest_msg(">primary(%s)\n", TOKSTR[n]);
if (n == EOI) {
syntax(NULL, "argument expected");
}
if (n == LPAREN) {
res = oexpr(check_operator(*++args));
if (check_operator(*++args) != RPAREN)
syntax(NULL, "closing paren expected");
unnest_msg("<primary:%lld\n", res);
return res;
}
/* coreutils 6.9 checks "is args[1] binop and args[2] exist?" first,
* do the same */
args0_op = last_operator;
/* last_operator = operator at args[1] */
if (check_operator(args[1]) != EOI) { /* if args[1] != NULL */
if (args[2]) {
// coreutils also does this:
// if (args[3] && args[0]="-l" && args[2] is BINOP)
// return binop(1 /* prepended by -l */);
if (last_operator->op_type == BINOP)
unnest_msg_and_return(binop(), "<primary: binop:%lld\n");
}
}
/* check "is args[0] unop?" second */
if (args0_op->op_type == UNOP) {
/* unary expression */
if (args[1] == NULL)
// syntax(args0_op->op_text, "argument expected");
goto check_emptiness;
args++;
if (n == STREZ)
unnest_msg_and_return(args[0][0] == '\0', "<primary:%lld\n");
if (n == STRNZ)
unnest_msg_and_return(args[0][0] != '\0', "<primary:%lld\n");
if (n == FILTT)
unnest_msg_and_return(isatty(getn(*args)), "<primary: isatty(%s)%lld\n", *args);
unnest_msg_and_return(filstat(*args, n), "<primary: filstat(%s):%lld\n", *args);
}
/*check_operator(args[1]); - already done */
if (last_operator->op_type == BINOP) {
/* args[2] is known to be NULL, isn't it bound to fail? */
unnest_msg_and_return(binop(), "<primary:%lld\n");
}
check_emptiness:
unnest_msg_and_return(args[0][0] != '\0', "<primary:%lld\n");
}
int test_main(int argc, char **argv)
{
int res;
const char *arg0;
#if BASH_TEST2
bool bt2 = 0;
#endif
arg0 = bb_basename(argv[0]);
if ((ENABLE_TEST1 || ENABLE_TEST2 || ENABLE_ASH_TEST || ENABLE_HUSH_TEST)
&& (arg0[0] == '[')
) {
--argc;
if (!arg0[1]) { /* "[" ? */
if (NOT_LONE_CHAR(argv[argc], ']')) {
bb_simple_error_msg("missing ]");
return 2;
}
} else { /* assuming "[[" */
if (strcmp(argv[argc], "]]") != 0) {
bb_simple_error_msg("missing ]]");
return 2;
}
#if BASH_TEST2
bt2 = 1;
#endif
}
argv[argc] = NULL;
}
/* argc is unused after this point */
/* We must do DEINIT_S() prior to returning */
INIT_S();
#if BASH_TEST2
bash_test2 = bt2;
#endif
res = setjmp(leaving);
if (res)
goto ret;
/* resetting ngroups is probably unnecessary. it will
* force a new call to getgroups(), which prevents using
* group data fetched during a previous call. but the
* only way the group data could be stale is if there's
* been an intervening call to setgroups(), and this
* isn't likely in the case of a shell. paranoia
* prevails...
*/
/*ngroups = 0; - done by INIT_S() */
argv++;
args = argv;
/* Implement special cases from POSIX.2, section 4.62.4.
* Testcase: "test '(' = '('"
* The general parser would misinterpret '(' as group start.
*/
if (1) {
int negate = 0;
again:
if (!argv[0]) {
/* "test" */
res = 1;
goto ret_special;
}
if (!argv[1]) {
/* "test [!] arg" */
res = (argv[0][0] == '\0');
goto ret_special;
}
if (argv[2]) {
if (!argv[3]) {
/*
* http://pubs.opengroup.org/onlinepubs/009695399/utilities/test.html
* """ 3 arguments:
* If $2 is a binary primary, perform the binary test of $1 and $3.
* """
*/
check_operator(argv[1]);
if (last_operator->op_type == BINOP) {
/* "test [!] arg1 <binary_op> arg2" */
args = argv;
res = (binop() == 0);
ret_special:
/* If there was leading "!" op... */
res ^= negate;
goto ret;
}
/* """If $1 is '(' and $3 is ')', perform the unary test of $2."""
* Looks like this works without additional coding.
*/
goto check_negate;
}
/* argv[3] exists (at least 4 args), is it exactly 4 args? */
if (!argv[4]) {
/*
* """ 4 arguments:
* If $1 is '!', negate the three-argument test of $2, $3, and $4.
* If $1 is '(' and $4 is ')', perform the two-argument test of $2 and $3.
* """
* Example why code below is necessary: test '(' ! -e ')'
*/
if (LONE_CHAR(argv[0], '(')
&& LONE_CHAR(argv[3], ')')
) {
/* "test [!] ( x y )" */
argv[3] = NULL;
argv++;
}
}
}
check_negate:
if (LONE_CHAR(argv[0], '!')) {
argv++;
negate ^= 1;
goto again;
}
}
res = !oexpr(check_operator(*args));
if (*args != NULL && *++args != NULL) {
/* Examples:
* test 3 -lt 5 6
* test -t 1 2
*/
bb_error_msg("%s: unknown operand", *args);
res = 2;
}
ret:
DEINIT_S();
return res;
}
|