forked from orafce/orafce
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathfile.c
1383 lines (1143 loc) · 28 KB
/
file.c
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
/*
* Attention - this functionality doesn't work when Orace is not linked with
* correct runtime library. The combination "vcruntime140.dll" is working for
* PostgreSQL 12 (vcruntime140d.dll doesn't work). Probably this runtime should
* be same like Postgres server runtime (what is used can be detected by
* dependency walker). Without correct linking the server crash when IO related
* functionality is used.
*/
#ifdef _MSC_VER
#define _CRT_SECURE_NO_DEPRECATE
#endif
#include "postgres.h"
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include "executor/spi.h"
#include "access/htup_details.h"
#include "catalog/pg_type.h"
#include "fmgr.h"
#include "funcapi.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "port.h"
#include "storage/fd.h"
#include "utils/builtins.h"
#include "utils/memutils.h"
#ifdef WIN32
#include "utils/pg_locale.h"
#endif
#include "orafce.h"
#include "builtins.h"
#ifndef ERRCODE_NO_DATA_FOUND
#define ERRCODE_NO_DATA_FOUND MAKE_SQLSTATE('P','0', '0','0','2')
#endif
#define INVALID_OPERATION "UTL_FILE_INVALID_OPERATION"
#define WRITE_ERROR "UTL_FILE_WRITE_ERROR"
#define READ_ERROR "UTL_FILE_READ_ERROR"
#define INVALID_FILEHANDLE "UTL_FILE_INVALID_FILEHANDLE"
#define INVALID_MAXLINESIZE "UTL_FILE_INVALID_MAXLINESIZE"
#define INVALID_MODE "UTL_FILE_INVALID_MODE"
#define INVALID_PATH "UTL_FILE_INVALID_PATH"
#define VALUE_ERROR "UTL_FILE_VALUE_ERROR"
PG_FUNCTION_INFO_V1(utl_file_fopen);
PG_FUNCTION_INFO_V1(utl_file_is_open);
PG_FUNCTION_INFO_V1(utl_file_get_line);
PG_FUNCTION_INFO_V1(utl_file_get_nextline);
PG_FUNCTION_INFO_V1(utl_file_put);
PG_FUNCTION_INFO_V1(utl_file_put_line);
PG_FUNCTION_INFO_V1(utl_file_new_line);
PG_FUNCTION_INFO_V1(utl_file_putf);
PG_FUNCTION_INFO_V1(utl_file_fflush);
PG_FUNCTION_INFO_V1(utl_file_fclose);
PG_FUNCTION_INFO_V1(utl_file_fclose_all);
PG_FUNCTION_INFO_V1(utl_file_fremove);
PG_FUNCTION_INFO_V1(utl_file_frename);
PG_FUNCTION_INFO_V1(utl_file_fcopy);
PG_FUNCTION_INFO_V1(utl_file_fgetattr);
PG_FUNCTION_INFO_V1(utl_file_tmpdir);
#define CUSTOM_EXCEPTION(msg, detail) \
ereport(ERROR, \
(errcode(ERRCODE_RAISE_EXCEPTION), \
errmsg("%s", msg), \
errdetail("%s", detail)))
#define STRERROR_EXCEPTION(msg) \
do { char *strerr = strerror(errno); CUSTOM_EXCEPTION(msg, strerr); } while(0);
#define INVALID_FILEHANDLE_EXCEPTION() CUSTOM_EXCEPTION(INVALID_FILEHANDLE, "Used file handle isn't valid.")
#define CHECK_FILE_HANDLE() \
if (PG_ARGISNULL(0)) \
CUSTOM_EXCEPTION(INVALID_FILEHANDLE, "Used file handle isn't valid.")
#define NON_EMPTY_TEXT(dat) \
if (VARSIZE(dat) - VARHDRSZ == 0) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
errmsg("invalid parameter"), \
errdetail("Empty string isn't allowed.")));
#define NOT_NULL_ARG(n) \
if (PG_ARGISNULL(n)) \
ereport(ERROR, \
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED), \
errmsg("null value not allowed"), \
errhint("%dth argument is NULL.", n)));
#define MAX_LINESIZE 32767
#define CHECK_LINESIZE(max_linesize) \
do { \
if ((max_linesize) < 1 || (max_linesize) > MAX_LINESIZE) \
CUSTOM_EXCEPTION(INVALID_MAXLINESIZE, "maxlinesize is out of range"); \
} while(0)
typedef struct FileSlot
{
FILE *file;
int max_linesize;
int encoding;
int32 id;
} FileSlot;
#define MAX_SLOTS 50 /* Oracle 10g supports 50 files */
#define INVALID_SLOTID 0 /* invalid slot id */
static FileSlot slots[MAX_SLOTS]; /* initilaized with zeros */
static int32 slotid = 0; /* next slot id */
static void check_secure_locality(const char *path);
static char *get_safe_path(text *location, text *filename);
static int copy_text_file(FILE *srcfile, FILE *dstfile,
int start_line, int end_line);
/*
* get_descriptor(FILE *file) find any free slot for FILE pointer.
* If isn't realloc array slots and add 32 new free slots.
*
*/
static int
get_descriptor(FILE *file, int max_linesize, int encoding)
{
int i;
for (i = 0; i < MAX_SLOTS; i++)
{
if (slots[i].id == INVALID_SLOTID)
{
slots[i].id = ++slotid;
if (slots[i].id == INVALID_SLOTID)
slots[i].id = ++slotid; /* skip INVALID_SLOTID */
slots[i].file = file;
slots[i].max_linesize = max_linesize;
slots[i].encoding = encoding;
return slots[i].id;
}
}
return INVALID_SLOTID;
}
/* return stored pointer to FILE */
static FILE *
get_stream(int d, size_t *max_linesize, int *encoding)
{
int i;
if (d == INVALID_SLOTID)
INVALID_FILEHANDLE_EXCEPTION();
for (i = 0; i < MAX_SLOTS; i++)
{
if (slots[i].id == d)
{
if (max_linesize)
*max_linesize = slots[i].max_linesize;
if (encoding)
*encoding = slots[i].encoding;
return slots[i].file;
}
}
INVALID_FILEHANDLE_EXCEPTION();
return NULL; /* keep compiler quiet */
}
static void
IO_EXCEPTION(void)
{
switch (errno)
{
case EACCES:
case ENAMETOOLONG:
case ENOENT:
case ENOTDIR:
STRERROR_EXCEPTION(INVALID_PATH);
break;
default:
STRERROR_EXCEPTION(INVALID_OPERATION);
}
}
/*
* On WIN32 platform multibyte chars are not supported by
* fopen function. Instead we can use _wfopen functin. The
* arguments are of wchar strings, and should to use UTF16
* charset. Conversion from server encoding to wide strings
* is provided by function char2wchar (tested only for UTF8)
*/
#ifdef WIN32
static wchar_t *
to_wchar(const char *str)
{
size_t nbytes;
wchar_t *buff;
nbytes = strlen(str);
if ((nbytes + 1) > INT_MAX / sizeof(wchar_t))
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
buff = (wchar_t *) palloc((nbytes + 1) * sizeof(wchar_t));
char2wchar(buff, nbytes + 1, str, nbytes, 0);
return buff;
}
#endif
/*
* FUNCTION UTL_FILE.FOPEN(location text,
* filename text,
* open_mode text,
* max_linesize integer
* [, encoding text ])
* RETURNS UTL_FILE.FILE_TYPE;
*
* The FOPEN function opens specified file and returns file handle.
* open_mode: ['R', 'W', 'A']
* max_linesize: [1 .. 32767]
*
* Exceptions:
* INVALID_MODE, INVALID_OPERATION, INVALID_PATH, INVALID_MAXLINESIZE
*/
Datum
utl_file_fopen(PG_FUNCTION_ARGS)
{
text *open_mode;
int max_linesize;
int encoding;
const char *mode = NULL;
FILE *file;
char *fullname;
int d;
NOT_NULL_ARG(0);
NOT_NULL_ARG(1);
NOT_NULL_ARG(2);
NOT_NULL_ARG(3);
open_mode = PG_GETARG_TEXT_P(2);
NON_EMPTY_TEXT(open_mode);
max_linesize = PG_GETARG_INT32(3);
CHECK_LINESIZE(max_linesize);
if (PG_NARGS() > 4 && !PG_ARGISNULL(4))
{
const char *encname = NameStr(*PG_GETARG_NAME(4));
encoding = pg_char_to_encoding(encname);
if (encoding < 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid encoding name \"%s\"", encname)));
}
else
encoding = GetDatabaseEncoding();
if (VARSIZE(open_mode) - VARHDRSZ != 1)
CUSTOM_EXCEPTION(INVALID_MODE, "open mode is different than [R,W,A]");
switch (*((char*)VARDATA(open_mode)))
{
case 'a':
case 'A':
mode = "a";
break;
case 'r':
case 'R':
mode = "r";
break;
case 'w':
case 'W':
mode = "w";
break;
default:
CUSTOM_EXCEPTION(INVALID_MODE, "open mode is different than [R,W,A]");
}
/* open file */
fullname = get_safe_path(PG_GETARG_TEXT_P(0), PG_GETARG_TEXT_P(1));
/*
* We cannot use AllocateFile here because those files are automatically
* closed at the end of (sub)transactions, but we want to keep them open
* for oracle compatibility.
*/
#ifndef WIN32
file = fopen(fullname, mode);
#else
if (pg_database_encoding_max_length() > 1)
{
wchar_t *_fullname = to_wchar(fullname);
wchar_t *_mode = to_wchar(mode);
file = _wfopen(_fullname, _mode);
pfree(_fullname);
pfree(_mode);
}
else
file = fopen(fullname, mode);
#endif
if (!file)
IO_EXCEPTION();
d = get_descriptor(file, max_linesize, encoding);
if (d == INVALID_SLOTID)
{
fclose(file);
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("program limit exceeded"),
errdetail("Too many files opened concurrently"),
errhint("You can only open a maximum of ten files for each session")));
}
PG_RETURN_INT32(d);
}
Datum
utl_file_is_open(PG_FUNCTION_ARGS)
{
if (!PG_ARGISNULL(0))
{
int i;
int d = PG_GETARG_INT32(0);
for (i = 0; i < MAX_SLOTS; i++)
{
if (slots[i].id == d)
PG_RETURN_BOOL(slots[i].file != NULL);
}
}
PG_RETURN_BOOL(false);
}
#define CHECK_LENGTH(l) \
if (l > max_linesize) \
CUSTOM_EXCEPTION(VALUE_ERROR, "buffer is too short");
/* read line from file. set eof if is EOF */
static text *
get_line(FILE *f, size_t max_linesize, int encoding, bool *iseof)
{
int c;
char *buffer = NULL;
char *bpt;
size_t csize = 0;
text *result = NULL;
bool eof = true;
buffer = palloc(max_linesize + 2);
bpt = buffer;
errno = 0;
while (csize < max_linesize && (c = fgetc(f)) != EOF)
{
eof = false; /* I was able read one char */
if (c == '\r') /* lookin ahead \n */
{
c = fgetc(f);
if (c == EOF)
break; /* last char */
if (c != '\n')
ungetc(c, f);
/* skip \r\n */
break;
}
else if (c == '\n')
break;
++csize;
*bpt++ = c;
}
if (!eof)
{
char *decoded;
size_t len;
pg_verify_mbstr(encoding, buffer, size2int(csize), false);
decoded = (char *) pg_do_encoding_conversion((unsigned char *) buffer,
size2int(csize), encoding, GetDatabaseEncoding());
len = (decoded == buffer ? csize : strlen(decoded));
result = palloc(len + VARHDRSZ);
memcpy(VARDATA(result), decoded, len);
SET_VARSIZE(result, len + VARHDRSZ);
if (decoded != buffer)
pfree(decoded);
*iseof = false;
}
else
{
switch (errno)
{
case 0:
break;
case EBADF:
CUSTOM_EXCEPTION(INVALID_OPERATION, "file descriptor isn't valid for reading");
break;
default:
STRERROR_EXCEPTION(READ_ERROR);
break;
}
*iseof = true;
}
pfree(buffer);
return result;
}
/*
* FUNCTION UTL_FILE.GET_LINE(file UTL_TYPE.FILE_TYPE, line int DEFAULT NULL)
* RETURNS text;
*
* Reads one line from file.
*
* Exceptions:
* NO_DATA_FOUND, INVALID_FILEHANDLE, INVALID_OPERATION, READ_ERROR
*/
Datum
utl_file_get_line(PG_FUNCTION_ARGS)
{
size_t max_linesize = 0; /* keep compiler quiet */
int encoding = 0; /* keep compiler quiet */
FILE *f;
text *result;
bool iseof;
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), &max_linesize, &encoding);
/* 'len' overwrites max_linesize, but must be smaller than max_linesize */
if (PG_NARGS() > 1 && !PG_ARGISNULL(1))
{
size_t len = (size_t) PG_GETARG_INT32(1);
CHECK_LINESIZE(len);
if (max_linesize > len)
max_linesize = len;
}
result = get_line(f, max_linesize, encoding, &iseof);
if (iseof)
ereport(ERROR,
(errcode(ERRCODE_NO_DATA_FOUND),
errmsg("no data found")));
PG_RETURN_TEXT_P(result);
}
/*
* FUNCTION UTL_FILE.GET_NEXTLINE(file UTL_TYPE.FILE_TYPE)
* RETURNS text;
*
* Reads one line from file or retutns NULL
* by Steven Feuerstein.
*
* Exceptions:
* INVALID_FILEHANDLE, INVALID_OPERATION, READ_ERROR
*/
Datum
utl_file_get_nextline(PG_FUNCTION_ARGS)
{
size_t max_linesize = 0; /* keep compiler quiet */
int encoding = 0; /* keep compiler quiet */
FILE *f;
text *result;
bool iseof;
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), &max_linesize, &encoding);
result = get_line(f, max_linesize, encoding, &iseof);
if (iseof)
PG_RETURN_NULL();
PG_RETURN_TEXT_P(result);
}
static void
do_flush(FILE *f)
{
if (fflush(f) != 0)
{
if (errno == EBADF)
CUSTOM_EXCEPTION(INVALID_OPERATION, "File is not an opened, or is not open for writing");
else
STRERROR_EXCEPTION(WRITE_ERROR);
}
}
/*
* FUNCTION UTL_FILE.PUT(file UTL_FILE.FILE_TYPE, buffer text)
* RETURNS bool;
*
* The PUT function puts data out to specified file. Buffer length allowed is
* 32K or 1024 (max_linesize);
*
* Exceptions:
* INVALID_FILEHANDLE, INVALID_OPERATION, WRITE_ERROR, VALUE_ERROR
*
* Note: returns bool because I cannot do envelope over void function
*/
#define CHECK_ERRNO_PUT() \
switch (errno) \
{ \
case EBADF: \
CUSTOM_EXCEPTION(INVALID_OPERATION, "file descriptor isn't valid for writing"); \
break; \
default: \
STRERROR_EXCEPTION(WRITE_ERROR); \
}
/* encode(t, encoding) */
static char *
encode_text(int encoding, text *t, size_t *length)
{
char *src = VARDATA_ANY(t);
char *encoded;
encoded = (char *) pg_do_encoding_conversion((unsigned char *) src,
VARSIZE_ANY_EXHDR(t), GetDatabaseEncoding(), encoding);
*length = (src == encoded ? VARSIZE_ANY_EXHDR(t) : strlen(encoded));
return encoded;
}
/* fwrite(encode(args[n], encoding), f) */
static size_t
do_write(PG_FUNCTION_ARGS, int n, FILE *f, size_t max_linesize, int encoding)
{
text *arg = PG_GETARG_TEXT_P(n);
char *str;
size_t len;
str = encode_text(encoding, arg, &len);
CHECK_LENGTH(len);
if (fwrite(str, 1, len, f) != len)
CHECK_ERRNO_PUT();
if (VARDATA(arg) != str)
pfree(str);
PG_FREE_IF_COPY(arg, n);
return len;
}
static FILE *
do_put(PG_FUNCTION_ARGS)
{
FILE *f;
size_t max_linesize = 0; /* keep compiler quiet */
int encoding = 0; /* keep compiler quiet */
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), &max_linesize, &encoding);
NOT_NULL_ARG(1);
do_write(fcinfo, 1, f, max_linesize, encoding);
return f;
}
Datum
utl_file_put(PG_FUNCTION_ARGS)
{
do_put(fcinfo);
PG_RETURN_BOOL(true);
}
static void
do_new_line(FILE *f, int lines)
{
int i;
for (i = 0; i < lines; i++)
{
#ifndef WIN32
if (fputc('\n', f) == EOF)
CHECK_ERRNO_PUT();
#else
if (fputs("\r\n", f) == EOF)
CHECK_ERRNO_PUT();
#endif
}
}
Datum
utl_file_put_line(PG_FUNCTION_ARGS)
{
FILE *f;
bool autoflush;
f = do_put(fcinfo);
autoflush = PG_GETARG_IF_EXISTS(2, BOOL, false);
do_new_line(f, 1);
if (autoflush)
do_flush(f);
PG_RETURN_BOOL(true);
}
Datum
utl_file_new_line(PG_FUNCTION_ARGS)
{
FILE *f;
int lines;
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), NULL, NULL);
lines = PG_GETARG_IF_EXISTS(1, INT32, 1);
do_new_line(f, lines);
PG_RETURN_BOOL(true);
}
/*
* FUNCTION UTL_FILE.PUTF(file UTL_FILE.FILE_TYPE,
* format text,
* arg1 text,
* arg2 text,
* arg3 text,
* arg4 text,
* arg5 text)
* RETURNS bool;
*
* Puts formated data to file. Allows %s like subst symbol.
*
* Exception:
* INVALID_FILEHANDLE, INVALID_OPERATION, WRITE_ERROR
*/
Datum
utl_file_putf(PG_FUNCTION_ARGS)
{
FILE *f;
char *format;
size_t max_linesize;
int encoding;
size_t format_length;
char *fpt;
int cur_par = 0;
size_t cur_len = 0;
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), &max_linesize, &encoding);
NOT_NULL_ARG(1);
format = encode_text(encoding, PG_GETARG_TEXT_P(1), &format_length);
for (fpt = format; format_length > 0; fpt++, format_length--)
{
if (format_length == 1)
{
/* last char */
CHECK_LENGTH(++cur_len);
if (fputc(*fpt, f) == EOF)
CHECK_ERRNO_PUT();
continue;
}
/* ansi compatible string */
if (fpt[0] == '\\' && fpt[1] == 'n')
{
CHECK_LENGTH(++cur_len);
if (fputc('\n', f) == EOF)
CHECK_ERRNO_PUT();
fpt++; format_length--;
continue;
}
if (fpt[0] == '%')
{
if (fpt[1] == '%')
{
CHECK_LENGTH(++cur_len);
if (fputc('%', f) == EOF)
CHECK_ERRNO_PUT();
}
else if (fpt[1] == 's' && ++cur_par <= 5 && !PG_ARGISNULL(cur_par + 1))
{
cur_len += do_write(fcinfo, cur_par + 1, f, max_linesize - cur_len, encoding);
}
fpt++; format_length--;
continue;
}
CHECK_LENGTH(++cur_len);
if (fputc(fpt[0], f) == EOF)
CHECK_ERRNO_PUT();
}
PG_RETURN_BOOL(true);
}
/*
* FUNCTION UTL_FILE.FFLUSH(file UTL_FILE.FILE_TYPE)
* RETURNS void;
*
* This function makes sure that all pending data for the specified file is written
* physically out to file.
*
* Exceptions:
* INVALID_FILEHANDLE, INVALID_OPERATION, WRITE_ERROR
*/
Datum
utl_file_fflush(PG_FUNCTION_ARGS)
{
FILE *f;
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), NULL, NULL);
do_flush(f);
PG_RETURN_VOID();
}
/*
* FUNCTION UTL_FILE.FCLOSE(file UTL_FILE.FILE_TYPE)
* RETURNS NULL
*
* Close an open file. This function reset file handle to NULL on Oracle platform.
* It isn't possible in PostgreSQL, and then you have to call fclose function
* like:
* file := utl_file.fclose(file);
*
* Exception:
* INVALID_FILEHANDLE, WRITE_ERROR
*/
Datum
utl_file_fclose(PG_FUNCTION_ARGS)
{
int i;
int d = PG_GETARG_INT32(0);
for (i = 0; i < MAX_SLOTS; i++)
{
if (slots[i].id == d)
{
if (slots[i].file && fclose(slots[i].file) != 0)
{
if (errno == EBADF)
CUSTOM_EXCEPTION(INVALID_FILEHANDLE, "File is not an opened");
else
STRERROR_EXCEPTION(WRITE_ERROR);
}
slots[i].file = NULL;
slots[i].id = INVALID_SLOTID;
PG_RETURN_NULL();
}
}
INVALID_FILEHANDLE_EXCEPTION();
PG_RETURN_NULL();
}
/*
* FUNCTION UTL_FILE.FCLOSE_ALL()
* RETURNS void
*
* Close all opened files.
*
* Exceptions: WRITE_ERROR
*/
Datum
utl_file_fclose_all(PG_FUNCTION_ARGS)
{
int i;
for (i = 0; i < MAX_SLOTS; i++)
{
if (slots[i].id != INVALID_SLOTID)
{
if (slots[i].file && fclose(slots[i].file) != 0)
{
if (errno == EBADF)
CUSTOM_EXCEPTION(INVALID_FILEHANDLE, "File is not an opened");
else
STRERROR_EXCEPTION(WRITE_ERROR);
}
slots[i].file = NULL;
slots[i].id = INVALID_SLOTID;
}
}
PG_RETURN_VOID();
}
/*
* utl_file_dir security .. is solved with aux. table.
*
* Raise exception if don't find string in table.
*/
static void
check_secure_locality(const char *path)
{
static SPIPlanPtr plan = NULL;
Datum values[1];
char nulls[1] = {' '};
values[0] = CStringGetTextDatum(path);
/*
* SELECT 1 FROM utl_file.utl_file_dir
* WHERE CASE WHEN substring(dir from '.$') = '/' THEN
* substring($1, 1, length(dir)) = dir
* ELSE
* substring($1, 1, length(dir) + 1) = dir || '/'
* END
*/
if (SPI_connect() < 0)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("SPI_connect failed")));
if (!plan)
{
Oid argtypes[] = {TEXTOID};
/* Don't use LIKE not to escape '_' and '%' */
SPIPlanPtr p = SPI_prepare(
"SELECT 1 FROM utl_file.utl_file_dir"
" WHERE CASE WHEN substring(dir from '.$') = '/' THEN"
" substring($1, 1, length(dir)) = dir"
" ELSE"
" substring($1, 1, length(dir) + 1) = dir || '/'"
" END",
1, argtypes);
if (p == NULL || (plan = SPI_saveplan(p)) == NULL)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("SPI_prepare_failed")));
}
if (SPI_OK_SELECT != SPI_execute_plan(plan, values, nulls, false, 1))
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("can't execute sql")));
if (SPI_processed == 0)
ereport(ERROR,
(errcode(ERRCODE_RAISE_EXCEPTION),
errmsg(INVALID_PATH),
errdetail("you cannot access locality"),
errhint("locality is not found in utl_file_dir table")));
SPI_finish();
}
static char *
safe_named_location(text *location)
{
static SPIPlanPtr plan = NULL;
MemoryContext old_cxt;
Datum values[1];
char nulls[1] = {' '};
char *result;
old_cxt = CurrentMemoryContext;
values[0] = PointerGetDatum(location);
if (SPI_connect() < 0)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("SPI_connect failed")));
if (!plan)
{
Oid argtypes[] = {TEXTOID};
/* Don't use LIKE not to escape '_' and '%' */
SPIPlanPtr p = SPI_prepare(
"SELECT dir FROM utl_file.utl_file_dir WHERE dirname = $1",
1, argtypes);
if (p == NULL || (plan = SPI_saveplan(p)) == NULL)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("SPI_prepare_failed")));
}
if (SPI_OK_SELECT != SPI_execute_plan(plan, values, nulls, false, 1))
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("can't execute sql")));
if (SPI_processed > 0)
{
char *loc = SPI_getvalue(SPI_tuptable->vals[0],
SPI_tuptable->tupdesc, 1);
if (loc)
result = MemoryContextStrdup(old_cxt, loc);
else
result = NULL;
}
else
result = NULL;
SPI_finish();
MemoryContextSwitchTo(old_cxt);
return result;
}
/*
* get_safe_path - make a fullpath and check security.
*/
static char *
get_safe_path(text *location_or_dirname, text *filename)
{
char *fullname;
char *location;
bool check_locality;
NON_EMPTY_TEXT(location_or_dirname);
NON_EMPTY_TEXT(filename);
location = safe_named_location(location_or_dirname);
if (location)
{
int aux_pos = size2int(strlen(location));
int aux_len = VARSIZE_ANY_EXHDR(filename);
fullname = palloc(aux_pos + 1 + aux_len + 1);
strcpy(fullname, location);
fullname[aux_pos] = '/';
memcpy(fullname + aux_pos + 1, VARDATA(filename), aux_len);
fullname[aux_pos + aux_len + 1] = '\0';
/* location is safe (ensured by dirname) */
check_locality = false;
pfree(location);
}
else
{
int aux_pos = VARSIZE_ANY_EXHDR(location_or_dirname);
int aux_len = VARSIZE_ANY_EXHDR(filename);
fullname = palloc(aux_pos + 1 + aux_len + 1);
memcpy(fullname, VARDATA(location_or_dirname), aux_pos);
fullname[aux_pos] = '/';
memcpy(fullname + aux_pos + 1, VARDATA(filename), aux_len);
fullname[aux_pos + aux_len + 1] = '\0';
check_locality = true;
}
/* check locality in canonizalized form of path */
canonicalize_path(fullname);
if (check_locality)
check_secure_locality(fullname);
return fullname;
}
/*