1 /*
2 * Copyright (c) Christos Zoulas 2003.
3 * All Rights Reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice immediately at the beginning of the file, without modification,
10 * this list of conditions, and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27 #include "file.h"
28
29 #ifndef lint
30 FILE_RCSID("@(#)$File: funcs.c,v 1.121 2021/02/05 22:29:07 christos Exp $")
31 #endif /* lint */
32
33 #include "magic.h"
34 #include <assert.h>
35 #include <stdarg.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <ctype.h>
39 #ifdef HAVE_UNISTD_H
40 #include <unistd.h> /* for pipe2() */
41 #endif
42 #if defined(HAVE_WCHAR_H)
43 #include <wchar.h>
44 #endif
45 #if defined(HAVE_WCTYPE_H)
46 #include <wctype.h>
47 #endif
48 #include <limits.h>
49
50 #ifndef SIZE_MAX
51 #define SIZE_MAX ((size_t)~0)
52 #endif
53
54 protected char *
file_copystr(char * buf,size_t blen,size_t width,const char * str)55 file_copystr(char *buf, size_t blen, size_t width, const char *str)
56 {
57 if (++width > blen)
58 width = blen;
59 strlcpy(buf, str, width);
60 return buf;
61 }
62
63 private void
file_clearbuf(struct magic_set * ms)64 file_clearbuf(struct magic_set *ms)
65 {
66 free(ms->o.buf);
67 ms->o.buf = NULL;
68 ms->o.blen = 0;
69 }
70
71 private int
file_checkfield(char * msg,size_t mlen,const char * what,const char ** pp)72 file_checkfield(char *msg, size_t mlen, const char *what, const char **pp)
73 {
74 const char *p = *pp;
75 int fw = 0;
76
77 while (*p && isdigit((unsigned char)*p))
78 fw = fw * 10 + (*p++ - '0');
79
80 *pp = p;
81
82 if (fw < 1024)
83 return 1;
84 if (msg)
85 snprintf(msg, mlen, "field %s too large: %d", what, fw);
86
87 return 0;
88 }
89
90 protected int
file_checkfmt(char * msg,size_t mlen,const char * fmt)91 file_checkfmt(char *msg, size_t mlen, const char *fmt)
92 {
93 for (const char *p = fmt; *p; p++) {
94 if (*p != '%')
95 continue;
96 if (*++p == '%')
97 continue;
98 // Skip uninteresting.
99 while (strchr("#0.'+- ", *p) != NULL)
100 p++;
101 if (*p == '*') {
102 if (msg)
103 snprintf(msg, mlen, "* not allowed in format");
104 return -1;
105 }
106
107 if (!file_checkfield(msg, mlen, "width", &p))
108 return -1;
109
110 if (*p == '.') {
111 p++;
112 if (!file_checkfield(msg, mlen, "precision", &p))
113 return -1;
114 }
115
116 if (!isalpha((unsigned char)*p)) {
117 if (msg)
118 snprintf(msg, mlen, "bad format char: %c", *p);
119 return -1;
120 }
121 }
122 return 0;
123 }
124
125 /*
126 * Like printf, only we append to a buffer.
127 */
128 protected int
file_vprintf(struct magic_set * ms,const char * fmt,va_list ap)129 file_vprintf(struct magic_set *ms, const char *fmt, va_list ap)
130 {
131 int len;
132 char *buf, *newstr;
133 char tbuf[1024];
134
135 if (ms->event_flags & EVENT_HAD_ERR)
136 return 0;
137
138 if (file_checkfmt(tbuf, sizeof(tbuf), fmt)) {
139 file_clearbuf(ms);
140 file_error(ms, 0, "Bad magic format `%s' (%s)", fmt, tbuf);
141 return -1;
142 }
143
144 len = vasprintf(&buf, fmt, ap);
145 if (len < 0 || (size_t)len > 1024 || len + ms->o.blen > 1024 * 1024) {
146 size_t blen = ms->o.blen;
147 free(buf);
148 file_clearbuf(ms);
149 file_error(ms, 0, "Output buffer space exceeded %d+%zu", len,
150 blen);
151 return -1;
152 }
153
154 if (ms->o.buf != NULL) {
155 len = asprintf(&newstr, "%s%s", ms->o.buf, buf);
156 free(buf);
157 if (len < 0)
158 goto out;
159 free(ms->o.buf);
160 buf = newstr;
161 }
162 ms->o.buf = buf;
163 ms->o.blen = len;
164 return 0;
165 out:
166 file_clearbuf(ms);
167 file_error(ms, errno, "vasprintf failed");
168 return -1;
169 }
170
171 protected int
file_printf(struct magic_set * ms,const char * fmt,...)172 file_printf(struct magic_set *ms, const char *fmt, ...)
173 {
174 int rv;
175 va_list ap;
176
177 va_start(ap, fmt);
178 rv = file_vprintf(ms, fmt, ap);
179 va_end(ap);
180 return rv;
181 }
182
183 /*
184 * error - print best error message possible
185 */
186 /*VARARGS*/
187 __attribute__((__format__(__printf__, 3, 0)))
188 private void
file_error_core(struct magic_set * ms,int error,const char * f,va_list va,size_t lineno)189 file_error_core(struct magic_set *ms, int error, const char *f, va_list va,
190 size_t lineno)
191 {
192 /* Only the first error is ok */
193 if (ms->event_flags & EVENT_HAD_ERR)
194 return;
195 if (lineno != 0) {
196 file_clearbuf(ms);
197 (void)file_printf(ms, "line %" SIZE_T_FORMAT "u:", lineno);
198 }
199 if (ms->o.buf && *ms->o.buf)
200 (void)file_printf(ms, " ");
201 (void)file_vprintf(ms, f, va);
202 if (error > 0)
203 (void)file_printf(ms, " (%s)", strerror(error));
204 ms->event_flags |= EVENT_HAD_ERR;
205 ms->error = error;
206 }
207
208 /*VARARGS*/
209 protected void
file_error(struct magic_set * ms,int error,const char * f,...)210 file_error(struct magic_set *ms, int error, const char *f, ...)
211 {
212 va_list va;
213 va_start(va, f);
214 file_error_core(ms, error, f, va, 0);
215 va_end(va);
216 }
217
218 /*
219 * Print an error with magic line number.
220 */
221 /*VARARGS*/
222 protected void
file_magerror(struct magic_set * ms,const char * f,...)223 file_magerror(struct magic_set *ms, const char *f, ...)
224 {
225 va_list va;
226 va_start(va, f);
227 file_error_core(ms, 0, f, va, ms->line);
228 va_end(va);
229 }
230
231 protected void
file_oomem(struct magic_set * ms,size_t len)232 file_oomem(struct magic_set *ms, size_t len)
233 {
234 file_error(ms, errno, "cannot allocate %" SIZE_T_FORMAT "u bytes",
235 len);
236 }
237
238 protected void
file_badseek(struct magic_set * ms)239 file_badseek(struct magic_set *ms)
240 {
241 file_error(ms, errno, "error seeking");
242 }
243
244 protected void
file_badread(struct magic_set * ms)245 file_badread(struct magic_set *ms)
246 {
247 file_error(ms, errno, "error reading");
248 }
249
250 #ifndef COMPILE_ONLY
251 #define FILE_SEPARATOR "\n- "
252
253 protected int
file_separator(struct magic_set * ms)254 file_separator(struct magic_set *ms)
255 {
256 return file_printf(ms, FILE_SEPARATOR);
257 }
258
259 static void
trim_separator(struct magic_set * ms)260 trim_separator(struct magic_set *ms)
261 {
262 size_t l;
263
264 if (ms->o.buf == NULL)
265 return;
266
267 l = strlen(ms->o.buf);
268 if (l < sizeof(FILE_SEPARATOR))
269 return;
270
271 l -= sizeof(FILE_SEPARATOR) - 1;
272 if (strcmp(ms->o.buf + l, FILE_SEPARATOR) != 0)
273 return;
274
275 ms->o.buf[l] = '\0';
276 }
277
278 static int
checkdone(struct magic_set * ms,int * rv)279 checkdone(struct magic_set *ms, int *rv)
280 {
281 if ((ms->flags & MAGIC_CONTINUE) == 0)
282 return 1;
283 if (file_separator(ms) == -1)
284 *rv = -1;
285 return 0;
286 }
287
288 protected int
file_default(struct magic_set * ms,size_t nb)289 file_default(struct magic_set *ms, size_t nb)
290 {
291 if (ms->flags & MAGIC_MIME) {
292 if ((ms->flags & MAGIC_MIME_TYPE) &&
293 file_printf(ms, "application/%s",
294 nb ? "octet-stream" : "x-empty") == -1)
295 return -1;
296 return 1;
297 }
298 if (ms->flags & MAGIC_APPLE) {
299 if (file_printf(ms, "UNKNUNKN") == -1)
300 return -1;
301 return 1;
302 }
303 if (ms->flags & MAGIC_EXTENSION) {
304 if (file_printf(ms, "???") == -1)
305 return -1;
306 return 1;
307 }
308 return 0;
309 }
310
311 /*
312 * The magic detection functions return:
313 * 1: found
314 * 0: not found
315 * -1: error
316 */
317 /*ARGSUSED*/
318 protected int
file_buffer(struct magic_set * ms,int fd,struct stat * st,const char * inname,const void * buf,size_t nb)319 file_buffer(struct magic_set *ms, int fd, struct stat *st,
320 const char *inname __attribute__ ((__unused__)),
321 const void *buf, size_t nb)
322 {
323 int m = 0, rv = 0, looks_text = 0;
324 const char *code = NULL;
325 const char *code_mime = "binary";
326 const char *def = "data";
327 const char *ftype = NULL;
328 char *rbuf = NULL;
329 struct buffer b;
330
331 buffer_init(&b, fd, st, buf, nb);
332 ms->mode = b.st.st_mode;
333
334 if (nb == 0) {
335 def = "empty";
336 goto simple;
337 } else if (nb == 1) {
338 def = "very short file (no magic)";
339 goto simple;
340 }
341
342 if ((ms->flags & MAGIC_NO_CHECK_ENCODING) == 0) {
343 looks_text = file_encoding(ms, &b, NULL, 0,
344 &code, &code_mime, &ftype);
345 }
346
347 #ifdef __EMX__
348 if ((ms->flags & MAGIC_NO_CHECK_APPTYPE) == 0 && inname) {
349 m = file_os2_apptype(ms, inname, &b);
350 if ((ms->flags & MAGIC_DEBUG) != 0)
351 (void)fprintf(stderr, "[try os2_apptype %d]\n", m);
352 switch (m) {
353 case -1:
354 return -1;
355 case 0:
356 break;
357 default:
358 return 1;
359 }
360 }
361 #endif
362 #if HAVE_FORK
363 /* try compression stuff */
364 if ((ms->flags & MAGIC_NO_CHECK_COMPRESS) == 0) {
365 m = file_zmagic(ms, &b, inname);
366 if ((ms->flags & MAGIC_DEBUG) != 0)
367 (void)fprintf(stderr, "[try zmagic %d]\n", m);
368 if (m) {
369 goto done_encoding;
370 }
371 }
372 #endif
373 /* Check if we have a tar file */
374 if ((ms->flags & MAGIC_NO_CHECK_TAR) == 0) {
375 m = file_is_tar(ms, &b);
376 if ((ms->flags & MAGIC_DEBUG) != 0)
377 (void)fprintf(stderr, "[try tar %d]\n", m);
378 if (m) {
379 if (checkdone(ms, &rv))
380 goto done;
381 }
382 }
383
384 /* Check if we have a JSON file */
385 if ((ms->flags & MAGIC_NO_CHECK_JSON) == 0) {
386 m = file_is_json(ms, &b);
387 if ((ms->flags & MAGIC_DEBUG) != 0)
388 (void)fprintf(stderr, "[try json %d]\n", m);
389 if (m) {
390 if (checkdone(ms, &rv))
391 goto done;
392 }
393 }
394
395 /* Check if we have a CSV file */
396 if ((ms->flags & MAGIC_NO_CHECK_CSV) == 0) {
397 m = file_is_csv(ms, &b, looks_text);
398 if ((ms->flags & MAGIC_DEBUG) != 0)
399 (void)fprintf(stderr, "[try csv %d]\n", m);
400 if (m) {
401 if (checkdone(ms, &rv))
402 goto done;
403 }
404 }
405
406 /* Check if we have a CDF file */
407 if ((ms->flags & MAGIC_NO_CHECK_CDF) == 0) {
408 m = file_trycdf(ms, &b);
409 if ((ms->flags & MAGIC_DEBUG) != 0)
410 (void)fprintf(stderr, "[try cdf %d]\n", m);
411 if (m) {
412 if (checkdone(ms, &rv))
413 goto done;
414 }
415 }
416 #ifdef BUILTIN_ELF
417 if ((ms->flags & MAGIC_NO_CHECK_ELF) == 0 && nb > 5 && fd != -1) {
418 file_pushbuf_t *pb;
419 /*
420 * We matched something in the file, so this
421 * *might* be an ELF file, and the file is at
422 * least 5 bytes long, so if it's an ELF file
423 * it has at least one byte past the ELF magic
424 * number - try extracting information from the
425 * ELF headers that cannot easily be extracted
426 * with rules in the magic file. We we don't
427 * print the information yet.
428 */
429 if ((pb = file_push_buffer(ms)) == NULL)
430 return -1;
431
432 rv = file_tryelf(ms, &b);
433 rbuf = file_pop_buffer(ms, pb);
434 if (rv == -1) {
435 free(rbuf);
436 rbuf = NULL;
437 }
438 if ((ms->flags & MAGIC_DEBUG) != 0)
439 (void)fprintf(stderr, "[try elf %d]\n", m);
440 }
441 #endif
442
443 /* try soft magic tests */
444 if ((ms->flags & MAGIC_NO_CHECK_SOFT) == 0) {
445 m = file_softmagic(ms, &b, NULL, NULL, BINTEST, looks_text);
446 if ((ms->flags & MAGIC_DEBUG) != 0)
447 (void)fprintf(stderr, "[try softmagic %d]\n", m);
448 if (m == 1 && rbuf) {
449 if (file_printf(ms, "%s", rbuf) == -1)
450 goto done;
451 }
452 if (m) {
453 if (checkdone(ms, &rv))
454 goto done;
455 }
456 }
457
458 /* try text properties */
459 if ((ms->flags & MAGIC_NO_CHECK_TEXT) == 0) {
460
461 m = file_ascmagic(ms, &b, looks_text);
462 if ((ms->flags & MAGIC_DEBUG) != 0)
463 (void)fprintf(stderr, "[try ascmagic %d]\n", m);
464 if (m) {
465 goto done;
466 }
467 }
468
469 simple:
470 /* give up */
471 if (m == 0) {
472 m = 1;
473 rv = file_default(ms, nb);
474 if (rv == 0)
475 if (file_printf(ms, "%s", def) == -1)
476 rv = -1;
477 }
478 done:
479 trim_separator(ms);
480 if ((ms->flags & MAGIC_MIME_ENCODING) != 0) {
481 if (ms->flags & MAGIC_MIME_TYPE)
482 if (file_printf(ms, "; charset=") == -1)
483 rv = -1;
484 if (file_printf(ms, "%s", code_mime) == -1)
485 rv = -1;
486 }
487 #if HAVE_FORK
488 done_encoding:
489 #endif
490 free(rbuf);
491 buffer_fini(&b);
492 if (rv)
493 return rv;
494
495 return m;
496 }
497 #endif
498
499 protected int
file_reset(struct magic_set * ms,int checkloaded)500 file_reset(struct magic_set *ms, int checkloaded)
501 {
502 if (checkloaded && ms->mlist[0] == NULL) {
503 file_error(ms, 0, "no magic files loaded");
504 return -1;
505 }
506 file_clearbuf(ms);
507 if (ms->o.pbuf) {
508 free(ms->o.pbuf);
509 ms->o.pbuf = NULL;
510 }
511 ms->event_flags &= ~EVENT_HAD_ERR;
512 ms->error = -1;
513 return 0;
514 }
515
516 #define OCTALIFY(n, o) \
517 /*LINTED*/ \
518 (void)(*(n)++ = '\\', \
519 *(n)++ = ((CAST(uint32_t, *(o)) >> 6) & 3) + '0', \
520 *(n)++ = ((CAST(uint32_t, *(o)) >> 3) & 7) + '0', \
521 *(n)++ = ((CAST(uint32_t, *(o)) >> 0) & 7) + '0', \
522 (o)++)
523
524 protected const char *
file_getbuffer(struct magic_set * ms)525 file_getbuffer(struct magic_set *ms)
526 {
527 char *pbuf, *op, *np;
528 size_t psize, len;
529
530 if (ms->event_flags & EVENT_HAD_ERR)
531 return NULL;
532
533 if (ms->flags & MAGIC_RAW)
534 return ms->o.buf;
535
536 if (ms->o.buf == NULL)
537 return NULL;
538
539 /* * 4 is for octal representation, + 1 is for NUL */
540 len = strlen(ms->o.buf);
541 if (len > (SIZE_MAX - 1) / 4) {
542 file_oomem(ms, len);
543 return NULL;
544 }
545 psize = len * 4 + 1;
546 if ((pbuf = CAST(char *, realloc(ms->o.pbuf, psize))) == NULL) {
547 file_oomem(ms, psize);
548 return NULL;
549 }
550 ms->o.pbuf = pbuf;
551
552 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
553 {
554 mbstate_t state;
555 wchar_t nextchar;
556 int mb_conv = 1;
557 size_t bytesconsumed;
558 char *eop;
559 (void)memset(&state, 0, sizeof(mbstate_t));
560
561 np = ms->o.pbuf;
562 op = ms->o.buf;
563 eop = op + len;
564
565 while (op < eop) {
566 bytesconsumed = mbrtowc(&nextchar, op,
567 CAST(size_t, eop - op), &state);
568 if (bytesconsumed == CAST(size_t, -1) ||
569 bytesconsumed == CAST(size_t, -2)) {
570 mb_conv = 0;
571 break;
572 }
573
574 if (iswprint(nextchar)) {
575 (void)memcpy(np, op, bytesconsumed);
576 op += bytesconsumed;
577 np += bytesconsumed;
578 } else {
579 while (bytesconsumed-- > 0)
580 OCTALIFY(np, op);
581 }
582 }
583 *np = '\0';
584
585 /* Parsing succeeded as a multi-byte sequence */
586 if (mb_conv != 0)
587 return ms->o.pbuf;
588 }
589 #endif
590
591 for (np = ms->o.pbuf, op = ms->o.buf; *op;) {
592 if (isprint(CAST(unsigned char, *op))) {
593 *np++ = *op++;
594 } else {
595 OCTALIFY(np, op);
596 }
597 }
598 *np = '\0';
599 return ms->o.pbuf;
600 }
601
602 protected int
file_check_mem(struct magic_set * ms,unsigned int level)603 file_check_mem(struct magic_set *ms, unsigned int level)
604 {
605 size_t len;
606
607 if (level >= ms->c.len) {
608 len = (ms->c.len = 20 + level) * sizeof(*ms->c.li);
609 ms->c.li = CAST(struct level_info *, (ms->c.li == NULL) ?
610 malloc(len) :
611 realloc(ms->c.li, len));
612 if (ms->c.li == NULL) {
613 file_oomem(ms, len);
614 return -1;
615 }
616 }
617 ms->c.li[level].got_match = 0;
618 #ifdef ENABLE_CONDITIONALS
619 ms->c.li[level].last_match = 0;
620 ms->c.li[level].last_cond = COND_NONE;
621 #endif /* ENABLE_CONDITIONALS */
622 return 0;
623 }
624
625 protected size_t
file_printedlen(const struct magic_set * ms)626 file_printedlen(const struct magic_set *ms)
627 {
628 return ms->o.blen;
629 }
630
631 protected int
file_replace(struct magic_set * ms,const char * pat,const char * rep)632 file_replace(struct magic_set *ms, const char *pat, const char *rep)
633 {
634 file_regex_t rx;
635 int rc, rv = -1;
636
637 rc = file_regcomp(&rx, pat, REG_EXTENDED);
638 if (rc) {
639 file_regerror(&rx, rc, ms);
640 } else {
641 regmatch_t rm;
642 int nm = 0;
643 while (file_regexec(&rx, ms->o.buf, 1, &rm, 0) == 0) {
644 ms->o.buf[rm.rm_so] = '\0';
645 if (file_printf(ms, "%s%s", rep,
646 rm.rm_eo != 0 ? ms->o.buf + rm.rm_eo : "") == -1)
647 goto out;
648 nm++;
649 }
650 rv = nm;
651 }
652 out:
653 file_regfree(&rx);
654 return rv;
655 }
656
657 protected int
file_regcomp(file_regex_t * rx,const char * pat,int flags)658 file_regcomp(file_regex_t *rx, const char *pat, int flags)
659 {
660 #ifdef USE_C_LOCALE
661 rx->c_lc_ctype = newlocale(LC_CTYPE_MASK, "C", 0);
662 assert(rx->c_lc_ctype != NULL);
663 rx->old_lc_ctype = uselocale(rx->c_lc_ctype);
664 assert(rx->old_lc_ctype != NULL);
665 #else
666 rx->old_lc_ctype = setlocale(LC_CTYPE, NULL);
667 assert(rx->old_lc_ctype != NULL);
668 rx->old_lc_ctype = strdup(rx->old_lc_ctype);
669 assert(rx->old_lc_ctype != NULL);
670 (void)setlocale(LC_CTYPE, "C");
671 #endif
672 rx->pat = pat;
673
674 return rx->rc = regcomp(&rx->rx, pat, flags);
675 }
676
677 protected int
file_regexec(file_regex_t * rx,const char * str,size_t nmatch,regmatch_t * pmatch,int eflags)678 file_regexec(file_regex_t *rx, const char *str, size_t nmatch,
679 regmatch_t* pmatch, int eflags)
680 {
681 assert(rx->rc == 0);
682 /* XXX: force initialization because glibc does not always do this */
683 if (nmatch != 0)
684 memset(pmatch, 0, nmatch * sizeof(*pmatch));
685 return regexec(&rx->rx, str, nmatch, pmatch, eflags);
686 }
687
688 protected void
file_regfree(file_regex_t * rx)689 file_regfree(file_regex_t *rx)
690 {
691 if (rx->rc == 0)
692 regfree(&rx->rx);
693 #ifdef USE_C_LOCALE
694 (void)uselocale(rx->old_lc_ctype);
695 freelocale(rx->c_lc_ctype);
696 #else
697 (void)setlocale(LC_CTYPE, rx->old_lc_ctype);
698 free(rx->old_lc_ctype);
699 #endif
700 }
701
702 protected void
file_regerror(file_regex_t * rx,int rc,struct magic_set * ms)703 file_regerror(file_regex_t *rx, int rc, struct magic_set *ms)
704 {
705 char errmsg[512];
706
707 (void)regerror(rc, &rx->rx, errmsg, sizeof(errmsg));
708 file_magerror(ms, "regex error %d for `%s', (%s)", rc, rx->pat,
709 errmsg);
710 }
711
712 protected file_pushbuf_t *
file_push_buffer(struct magic_set * ms)713 file_push_buffer(struct magic_set *ms)
714 {
715 file_pushbuf_t *pb;
716
717 if (ms->event_flags & EVENT_HAD_ERR)
718 return NULL;
719
720 if ((pb = (CAST(file_pushbuf_t *, malloc(sizeof(*pb))))) == NULL)
721 return NULL;
722
723 pb->buf = ms->o.buf;
724 pb->blen = ms->o.blen;
725 pb->offset = ms->offset;
726
727 ms->o.buf = NULL;
728 ms->o.blen = 0;
729 ms->offset = 0;
730
731 return pb;
732 }
733
734 protected char *
file_pop_buffer(struct magic_set * ms,file_pushbuf_t * pb)735 file_pop_buffer(struct magic_set *ms, file_pushbuf_t *pb)
736 {
737 char *rbuf;
738
739 if (ms->event_flags & EVENT_HAD_ERR) {
740 free(pb->buf);
741 free(pb);
742 return NULL;
743 }
744
745 rbuf = ms->o.buf;
746
747 ms->o.buf = pb->buf;
748 ms->o.blen = pb->blen;
749 ms->offset = pb->offset;
750
751 free(pb);
752 return rbuf;
753 }
754
755 /*
756 * convert string to ascii printable format.
757 */
758 protected char *
file_printable(char * buf,size_t bufsiz,const char * str,size_t slen)759 file_printable(char *buf, size_t bufsiz, const char *str, size_t slen)
760 {
761 char *ptr, *eptr = buf + bufsiz - 1;
762 const unsigned char *s = RCAST(const unsigned char *, str);
763 const unsigned char *es = s + slen;
764
765 for (ptr = buf; ptr < eptr && s < es && *s; s++) {
766 if (isprint(*s)) {
767 *ptr++ = *s;
768 continue;
769 }
770 if (ptr >= eptr - 3)
771 break;
772 *ptr++ = '\\';
773 *ptr++ = ((CAST(unsigned int, *s) >> 6) & 7) + '0';
774 *ptr++ = ((CAST(unsigned int, *s) >> 3) & 7) + '0';
775 *ptr++ = ((CAST(unsigned int, *s) >> 0) & 7) + '0';
776 }
777 *ptr = '\0';
778 return buf;
779 }
780
781 struct guid {
782 uint32_t data1;
783 uint16_t data2;
784 uint16_t data3;
785 uint8_t data4[8];
786 };
787
788 protected int
file_parse_guid(const char * s,uint64_t * guid)789 file_parse_guid(const char *s, uint64_t *guid)
790 {
791 struct guid *g = CAST(struct guid *, CAST(void *, guid));
792 return sscanf(s,
793 "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
794 &g->data1, &g->data2, &g->data3, &g->data4[0], &g->data4[1],
795 &g->data4[2], &g->data4[3], &g->data4[4], &g->data4[5],
796 &g->data4[6], &g->data4[7]) == 11 ? 0 : -1;
797 }
798
799 protected int
file_print_guid(char * str,size_t len,const uint64_t * guid)800 file_print_guid(char *str, size_t len, const uint64_t *guid)
801 {
802 const struct guid *g = CAST(const struct guid *,
803 CAST(const void *, guid));
804
805 return snprintf(str, len, "%.8X-%.4hX-%.4hX-%.2hhX%.2hhX-"
806 "%.2hhX%.2hhX%.2hhX%.2hhX%.2hhX%.2hhX",
807 g->data1, g->data2, g->data3, g->data4[0], g->data4[1],
808 g->data4[2], g->data4[3], g->data4[4], g->data4[5],
809 g->data4[6], g->data4[7]);
810 }
811
812 protected int
file_pipe_closexec(int * fds)813 file_pipe_closexec(int *fds)
814 {
815 #ifdef HAVE_PIPE2
816 return pipe2(fds, O_CLOEXEC);
817 #else
818 if (pipe(fds) == -1)
819 return -1;
820 (void)fcntl(fds[0], F_SETFD, FD_CLOEXEC);
821 (void)fcntl(fds[1], F_SETFD, FD_CLOEXEC);
822 return 0;
823 #endif
824 }
825
826 protected int
file_clear_closexec(int fd)827 file_clear_closexec(int fd) {
828 return fcntl(fd, F_SETFD, 0);
829 }
830
831 protected char *
file_strtrim(char * str)832 file_strtrim(char *str)
833 {
834 char *last;
835
836 while (isspace(CAST(unsigned char, *str)))
837 str++;
838 last = str;
839 while (*last)
840 last++;
841 --last;
842 while (isspace(CAST(unsigned char, *last)))
843 last--;
844 *++last = '\0';
845 return str;
846 }
847