1 /*
2 * Copyright (c) Ian F. Darwin 1986-1995.
3 * Software written by Ian F. Darwin and others;
4 * maintained 1995-present by Christos Zoulas and others.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice immediately at the beginning of the file, without modification,
11 * this list of conditions, and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 /*
29 * compress routines:
30 * zmagic() - returns 0 if not recognized, uncompresses and prints
31 * information if recognized
32 * uncompress(method, old, n, newch) - uncompress old into new,
33 * using method, return sizeof new
34 */
35 #include "file.h"
36
37 #ifndef lint
38 FILE_RCSID("@(#)$File: compress.c,v 1.107 2018/04/28 18:48:22 christos Exp $")
39 #endif
40
41 #include "magic.h"
42 #include <stdlib.h>
43 #ifdef HAVE_UNISTD_H
44 #include <unistd.h>
45 #endif
46 #include <string.h>
47 #include <errno.h>
48 #include <ctype.h>
49 #include <stdarg.h>
50 #ifdef HAVE_SIGNAL_H
51 #include <signal.h>
52 # ifndef HAVE_SIG_T
53 typedef void (*sig_t)(int);
54 # endif /* HAVE_SIG_T */
55 #endif
56 #if !defined(__MINGW32__) && !defined(WIN32)
57 #include <sys/ioctl.h>
58 #endif
59 #ifdef HAVE_SYS_WAIT_H
60 #include <sys/wait.h>
61 #endif
62 #if defined(HAVE_SYS_TIME_H)
63 #include <sys/time.h>
64 #endif
65 #if defined(HAVE_ZLIB_H) && defined(ZLIBSUPPORT)
66 #define BUILTIN_DECOMPRESS
67 #include <zlib.h>
68 #endif
69 #ifdef DEBUG
70 int tty = -1;
71 #define DPRINTF(...) do { \
72 if (tty == -1) \
73 tty = open("/dev/tty", O_RDWR); \
74 if (tty == -1) \
75 abort(); \
76 dprintf(tty, __VA_ARGS__); \
77 } while (/*CONSTCOND*/0)
78 #else
79 #define DPRINTF(...)
80 #endif
81
82 #ifdef ZLIBSUPPORT
83 /*
84 * The following python code is not really used because ZLIBSUPPORT is only
85 * defined if we have a built-in zlib, and the built-in zlib handles that.
86 * That is not true for android where we have zlib.h and not -lz.
87 */
88 static const char zlibcode[] =
89 "import sys, zlib; sys.stdout.write(zlib.decompress(sys.stdin.read()))";
90
91 static const char *zlib_args[] = { "python", "-c", zlibcode, NULL };
92
93 static int
zlibcmp(const unsigned char * buf)94 zlibcmp(const unsigned char *buf)
95 {
96 unsigned short x = 1;
97 unsigned char *s = CAST(unsigned char *, CAST(void *, &x));
98
99 if ((buf[0] & 0xf) != 8 || (buf[0] & 0x80) != 0)
100 return 0;
101 if (s[0] != 1) /* endianness test */
102 x = buf[0] | (buf[1] << 8);
103 else
104 x = buf[1] | (buf[0] << 8);
105 if (x % 31)
106 return 0;
107 return 1;
108 }
109 #endif
110
111 #define gzip_flags "-cd"
112 #define lrzip_flags "-do"
113 #define lzip_flags gzip_flags
114
115 static const char *gzip_args[] = {
116 "gzip", gzip_flags, NULL
117 };
118 static const char *uncompress_args[] = {
119 "uncompress", "-c", NULL
120 };
121 static const char *bzip2_args[] = {
122 "bzip2", "-cd", NULL
123 };
124 static const char *lzip_args[] = {
125 "lzip", lzip_flags, NULL
126 };
127 static const char *xz_args[] = {
128 "xz", "-cd", NULL
129 };
130 static const char *lrzip_args[] = {
131 "lrzip", lrzip_flags, NULL
132 };
133 static const char *lz4_args[] = {
134 "lz4", "-cd", NULL
135 };
136 static const char *zstd_args[] = {
137 "zstd", "-cd", NULL
138 };
139
140 private const struct {
141 const void *magic;
142 size_t maglen;
143 const char **argv;
144 } compr[] = {
145 { "\037\235", 2, gzip_args }, /* compressed */
146 /* Uncompress can get stuck; so use gzip first if we have it
147 * Idea from Damien Clark, thanks! */
148 { "\037\235", 2, uncompress_args }, /* compressed */
149 { "\037\213", 2, gzip_args }, /* gzipped */
150 { "\037\236", 2, gzip_args }, /* frozen */
151 { "\037\240", 2, gzip_args }, /* SCO LZH */
152 /* the standard pack utilities do not accept standard input */
153 { "\037\036", 2, gzip_args }, /* packed */
154 { "PK\3\4", 4, gzip_args }, /* pkzipped, */
155 /* ...only first file examined */
156 { "BZh", 3, bzip2_args }, /* bzip2-ed */
157 { "LZIP", 4, lzip_args }, /* lzip-ed */
158 { "\3757zXZ\0", 6, xz_args }, /* XZ Utils */
159 { "LRZI", 4, lrzip_args }, /* LRZIP */
160 { "\004\"M\030",4, lz4_args }, /* LZ4 */
161 { "\x28\xB5\x2F\xFD", 4, zstd_args }, /* zstd */
162 #ifdef ZLIBSUPPORT
163 { RCAST(const void *, zlibcmp), 0, zlib_args }, /* zlib */
164 #endif
165 };
166
167 #define OKDATA 0
168 #define NODATA 1
169 #define ERRDATA 2
170
171 private ssize_t swrite(int, const void *, size_t);
172 #if HAVE_FORK
173 private size_t ncompr = sizeof(compr) / sizeof(compr[0]);
174 private int uncompressbuf(int, size_t, size_t, const unsigned char *,
175 unsigned char **, size_t *);
176 #ifdef BUILTIN_DECOMPRESS
177 private int uncompresszlib(const unsigned char *, unsigned char **, size_t,
178 size_t *, int);
179 private int uncompressgzipped(const unsigned char *, unsigned char **, size_t,
180 size_t *);
181 #endif
182 static int makeerror(unsigned char **, size_t *, const char *, ...)
183 __attribute__((__format__(__printf__, 3, 4)));
184 private const char *methodname(size_t);
185
186 private int
format_decompression_error(struct magic_set * ms,size_t i,unsigned char * buf)187 format_decompression_error(struct magic_set *ms, size_t i, unsigned char *buf)
188 {
189 unsigned char *p;
190 int mime = ms->flags & MAGIC_MIME;
191
192 if (!mime)
193 return file_printf(ms, "ERROR:[%s: %s]", methodname(i), buf);
194
195 for (p = buf; *p; p++)
196 if (!isalnum(*p))
197 *p = '-';
198
199 return file_printf(ms, "application/x-decompression-error-%s-%s",
200 methodname(i), buf);
201 }
202
203 protected int
file_zmagic(struct magic_set * ms,const struct buffer * b,const char * name)204 file_zmagic(struct magic_set *ms, const struct buffer *b, const char *name)
205 {
206 unsigned char *newbuf = NULL;
207 size_t i, nsz;
208 char *rbuf;
209 file_pushbuf_t *pb;
210 int urv, prv, rv = 0;
211 int mime = ms->flags & MAGIC_MIME;
212 int fd = b->fd;
213 const unsigned char *buf = b->fbuf;
214 size_t nbytes = b->flen;
215 #ifdef HAVE_SIGNAL_H
216 sig_t osigpipe;
217 #endif
218
219 if ((ms->flags & MAGIC_COMPRESS) == 0)
220 return 0;
221
222 #ifdef HAVE_SIGNAL_H
223 osigpipe = signal(SIGPIPE, SIG_IGN);
224 #endif
225 for (i = 0; i < ncompr; i++) {
226 int zm;
227 if (nbytes < compr[i].maglen)
228 continue;
229 #ifdef ZLIBSUPPORT
230 if (compr[i].maglen == 0)
231 zm = (RCAST(int (*)(const unsigned char *),
232 CCAST(void *, compr[i].magic)))(buf);
233 else
234 #endif
235 zm = memcmp(buf, compr[i].magic, compr[i].maglen) == 0;
236
237 if (!zm)
238 continue;
239 nsz = nbytes;
240 urv = uncompressbuf(fd, ms->bytes_max, i, buf, &newbuf, &nsz);
241 DPRINTF("uncompressbuf = %d, %s, %zu\n", urv, (char *)newbuf,
242 nsz);
243 switch (urv) {
244 case OKDATA:
245 case ERRDATA:
246 ms->flags &= ~MAGIC_COMPRESS;
247 if (urv == ERRDATA)
248 prv = format_decompression_error(ms, i, newbuf);
249 else
250 prv = file_buffer(ms, -1, name, newbuf, nsz);
251 if (prv == -1)
252 goto error;
253 rv = 1;
254 if ((ms->flags & MAGIC_COMPRESS_TRANSP) != 0)
255 goto out;
256 if (mime != MAGIC_MIME && mime != 0)
257 goto out;
258 if ((file_printf(ms,
259 mime ? " compressed-encoding=" : " (")) == -1)
260 goto error;
261 if ((pb = file_push_buffer(ms)) == NULL)
262 goto error;
263 /*
264 * XXX: If file_buffer fails here, we overwrite
265 * the compressed text. FIXME.
266 */
267 if (file_buffer(ms, -1, NULL, buf, nbytes) == -1)
268 goto error;
269 if ((rbuf = file_pop_buffer(ms, pb)) != NULL) {
270 if (file_printf(ms, "%s", rbuf) == -1) {
271 free(rbuf);
272 goto error;
273 }
274 free(rbuf);
275 }
276 if (!mime && file_printf(ms, ")") == -1)
277 goto error;
278 /*FALLTHROUGH*/
279 case NODATA:
280 break;
281 default:
282 abort();
283 /*NOTREACHED*/
284 error:
285 rv = -1;
286 break;
287 }
288 }
289 out:
290 DPRINTF("rv = %d\n", rv);
291
292 #ifdef HAVE_SIGNAL_H
293 (void)signal(SIGPIPE, osigpipe);
294 #endif
295 free(newbuf);
296 ms->flags |= MAGIC_COMPRESS;
297 DPRINTF("Zmagic returns %d\n", rv);
298 return rv;
299 }
300 #endif
301 /*
302 * `safe' write for sockets and pipes.
303 */
304 private ssize_t
swrite(int fd,const void * buf,size_t n)305 swrite(int fd, const void *buf, size_t n)
306 {
307 ssize_t rv;
308 size_t rn = n;
309
310 do
311 switch (rv = write(fd, buf, n)) {
312 case -1:
313 if (errno == EINTR)
314 continue;
315 return -1;
316 default:
317 n -= rv;
318 buf = CAST(const char *, buf) + rv;
319 break;
320 }
321 while (n > 0);
322 return rn;
323 }
324
325
326 /*
327 * `safe' read for sockets and pipes.
328 */
329 protected ssize_t
sread(int fd,void * buf,size_t n,int canbepipe)330 sread(int fd, void *buf, size_t n, int canbepipe __attribute__((__unused__)))
331 {
332 ssize_t rv;
333 #ifdef FIONREAD
334 int t = 0;
335 #endif
336 size_t rn = n;
337
338 if (fd == STDIN_FILENO)
339 goto nocheck;
340
341 #ifdef FIONREAD
342 if (canbepipe && (ioctl(fd, FIONREAD, &t) == -1 || t == 0)) {
343 #ifdef FD_ZERO
344 ssize_t cnt;
345 for (cnt = 0;; cnt++) {
346 fd_set check;
347 struct timeval tout = {0, 100 * 1000};
348 int selrv;
349
350 FD_ZERO(&check);
351 FD_SET(fd, &check);
352
353 /*
354 * Avoid soft deadlock: do not read if there
355 * is nothing to read from sockets and pipes.
356 */
357 selrv = select(fd + 1, &check, NULL, NULL, &tout);
358 if (selrv == -1) {
359 if (errno == EINTR || errno == EAGAIN)
360 continue;
361 } else if (selrv == 0 && cnt >= 5) {
362 return 0;
363 } else
364 break;
365 }
366 #endif
367 (void)ioctl(fd, FIONREAD, &t);
368 }
369
370 if (t > 0 && (size_t)t < n) {
371 n = t;
372 rn = n;
373 }
374 #endif
375
376 nocheck:
377 do
378 switch ((rv = read(fd, buf, n))) {
379 case -1:
380 if (errno == EINTR)
381 continue;
382 return -1;
383 case 0:
384 return rn - n;
385 default:
386 n -= rv;
387 buf = CAST(char *, CCAST(void *, buf)) + rv;
388 break;
389 }
390 while (n > 0);
391 return rn;
392 }
393
394 protected int
file_pipe2file(struct magic_set * ms,int fd,const void * startbuf,size_t nbytes)395 file_pipe2file(struct magic_set *ms, int fd, const void *startbuf,
396 size_t nbytes)
397 {
398 char buf[4096];
399 ssize_t r;
400 int tfd;
401
402 (void)strlcpy(buf, "/tmp/file.XXXXXX", sizeof buf);
403 #ifndef HAVE_MKSTEMP
404 {
405 char *ptr = mktemp(buf);
406 tfd = open(ptr, O_RDWR|O_TRUNC|O_EXCL|O_CREAT, 0600);
407 r = errno;
408 (void)unlink(ptr);
409 errno = r;
410 }
411 #else
412 {
413 int te;
414 tfd = mkstemp(buf);
415 te = errno;
416 (void)unlink(buf);
417 errno = te;
418 }
419 #endif
420 if (tfd == -1) {
421 file_error(ms, errno,
422 "cannot create temporary file for pipe copy");
423 return -1;
424 }
425
426 if (swrite(tfd, startbuf, nbytes) != (ssize_t)nbytes)
427 r = 1;
428 else {
429 while ((r = sread(fd, buf, sizeof(buf), 1)) > 0)
430 if (swrite(tfd, buf, (size_t)r) != r)
431 break;
432 }
433
434 switch (r) {
435 case -1:
436 file_error(ms, errno, "error copying from pipe to temp file");
437 return -1;
438 case 0:
439 break;
440 default:
441 file_error(ms, errno, "error while writing to temp file");
442 return -1;
443 }
444
445 /*
446 * We duplicate the file descriptor, because fclose on a
447 * tmpfile will delete the file, but any open descriptors
448 * can still access the phantom inode.
449 */
450 if ((fd = dup2(tfd, fd)) == -1) {
451 file_error(ms, errno, "could not dup descriptor for temp file");
452 return -1;
453 }
454 (void)close(tfd);
455 if (lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) {
456 file_badseek(ms);
457 return -1;
458 }
459 return fd;
460 }
461 #if HAVE_FORK
462 #ifdef BUILTIN_DECOMPRESS
463
464 #define FHCRC (1 << 1)
465 #define FEXTRA (1 << 2)
466 #define FNAME (1 << 3)
467 #define FCOMMENT (1 << 4)
468
469
470 private int
uncompressgzipped(const unsigned char * old,unsigned char ** newch,size_t bytes_max,size_t * n)471 uncompressgzipped(const unsigned char *old, unsigned char **newch,
472 size_t bytes_max, size_t *n)
473 {
474 unsigned char flg = old[3];
475 size_t data_start = 10;
476
477 if (flg & FEXTRA) {
478 if (data_start + 1 >= *n)
479 goto err;
480 data_start += 2 + old[data_start] + old[data_start + 1] * 256;
481 }
482 if (flg & FNAME) {
483 while(data_start < *n && old[data_start])
484 data_start++;
485 data_start++;
486 }
487 if (flg & FCOMMENT) {
488 while(data_start < *n && old[data_start])
489 data_start++;
490 data_start++;
491 }
492 if (flg & FHCRC)
493 data_start += 2;
494
495 if (data_start >= *n)
496 goto err;
497
498 *n -= data_start;
499 old += data_start;
500 return uncompresszlib(old, newch, bytes_max, n, 0);
501 err:
502 return makeerror(newch, n, "File too short");
503 }
504
505 private int
uncompresszlib(const unsigned char * old,unsigned char ** newch,size_t bytes_max,size_t * n,int zlib)506 uncompresszlib(const unsigned char *old, unsigned char **newch,
507 size_t bytes_max, size_t *n, int zlib)
508 {
509 int rc;
510 z_stream z;
511
512 if ((*newch = CAST(unsigned char *, malloc(bytes_max + 1))) == NULL)
513 return makeerror(newch, n, "No buffer, %s", strerror(errno));
514
515 z.next_in = CCAST(Bytef *, old);
516 z.avail_in = CAST(uint32_t, *n);
517 z.next_out = *newch;
518 z.avail_out = CAST(unsigned int, bytes_max);
519 z.zalloc = Z_NULL;
520 z.zfree = Z_NULL;
521 z.opaque = Z_NULL;
522
523 /* LINTED bug in header macro */
524 rc = zlib ? inflateInit(&z) : inflateInit2(&z, -15);
525 if (rc != Z_OK)
526 goto err;
527
528 rc = inflate(&z, Z_SYNC_FLUSH);
529 if (rc != Z_OK && rc != Z_STREAM_END)
530 goto err;
531
532 *n = (size_t)z.total_out;
533 rc = inflateEnd(&z);
534 if (rc != Z_OK)
535 goto err;
536
537 /* let's keep the nul-terminate tradition */
538 (*newch)[*n] = '\0';
539
540 return OKDATA;
541 err:
542 strlcpy((char *)*newch, z.msg ? z.msg : zError(rc), bytes_max);
543 *n = strlen((char *)*newch);
544 return ERRDATA;
545 }
546 #endif
547
548 static int
makeerror(unsigned char ** buf,size_t * len,const char * fmt,...)549 makeerror(unsigned char **buf, size_t *len, const char *fmt, ...)
550 {
551 char *msg;
552 va_list ap;
553 int rv;
554
555 va_start(ap, fmt);
556 rv = vasprintf(&msg, fmt, ap);
557 va_end(ap);
558 if (rv < 0) {
559 *buf = NULL;
560 *len = 0;
561 return NODATA;
562 }
563 *buf = (unsigned char *)msg;
564 *len = strlen(msg);
565 return ERRDATA;
566 }
567
568 static void
closefd(int * fd,size_t i)569 closefd(int *fd, size_t i)
570 {
571 if (fd[i] == -1)
572 return;
573 (void) close(fd[i]);
574 fd[i] = -1;
575 }
576
577 static void
closep(int * fd)578 closep(int *fd)
579 {
580 size_t i;
581 for (i = 0; i < 2; i++)
582 closefd(fd, i);
583 }
584
585 static void
copydesc(int i,int * fd)586 copydesc(int i, int *fd)
587 {
588 int j = fd[i == STDIN_FILENO ? 0 : 1];
589 if (j == i)
590 return;
591 if (dup2(j, i) == -1) {
592 DPRINTF("dup(%d, %d) failed (%s)\n", j, i, strerror(errno));
593 exit(1);
594 }
595 closep(fd);
596 }
597
598 static void
writechild(int fdp[3][2],const void * old,size_t n)599 writechild(int fdp[3][2], const void *old, size_t n)
600 {
601 int status;
602
603 closefd(fdp[STDIN_FILENO], 0);
604 /*
605 * fork again, to avoid blocking because both
606 * pipes filled
607 */
608 switch (fork()) {
609 case 0: /* child */
610 closefd(fdp[STDOUT_FILENO], 0);
611 if (swrite(fdp[STDIN_FILENO][1], old, n) != (ssize_t)n) {
612 DPRINTF("Write failed (%s)\n", strerror(errno));
613 exit(1);
614 }
615 exit(0);
616 /*NOTREACHED*/
617
618 case -1:
619 DPRINTF("Fork failed (%s)\n", strerror(errno));
620 exit(1);
621 /*NOTREACHED*/
622
623 default: /* parent */
624 if (wait(&status) == -1) {
625 DPRINTF("Wait failed (%s)\n", strerror(errno));
626 exit(1);
627 }
628 DPRINTF("Grandchild wait return %#x\n", status);
629 }
630 closefd(fdp[STDIN_FILENO], 1);
631 }
632
633 static ssize_t
filter_error(unsigned char * ubuf,ssize_t n)634 filter_error(unsigned char *ubuf, ssize_t n)
635 {
636 char *p;
637 char *buf;
638
639 ubuf[n] = '\0';
640 buf = (char *)ubuf;
641 while (isspace((unsigned char)*buf))
642 buf++;
643 DPRINTF("Filter error[[[%s]]]\n", buf);
644 if ((p = strchr((char *)buf, '\n')) != NULL)
645 *p = '\0';
646 if ((p = strchr((char *)buf, ';')) != NULL)
647 *p = '\0';
648 if ((p = strrchr((char *)buf, ':')) != NULL) {
649 ++p;
650 while (isspace((unsigned char)*p))
651 p++;
652 n = strlen(p);
653 memmove(ubuf, p, CAST(size_t, n + 1));
654 }
655 DPRINTF("Filter error after[[[%s]]]\n", (char *)ubuf);
656 if (islower(*ubuf))
657 *ubuf = toupper(*ubuf);
658 return n;
659 }
660
661 private const char *
methodname(size_t method)662 methodname(size_t method)
663 {
664 #ifdef BUILTIN_DECOMPRESS
665 /* FIXME: This doesn't cope with bzip2 */
666 if (method == 2 || compr[method].maglen == 0)
667 return "zlib";
668 #endif
669 return compr[method].argv[0];
670 }
671
672 private int
uncompressbuf(int fd,size_t bytes_max,size_t method,const unsigned char * old,unsigned char ** newch,size_t * n)673 uncompressbuf(int fd, size_t bytes_max, size_t method, const unsigned char *old,
674 unsigned char **newch, size_t* n)
675 {
676 int fdp[3][2];
677 int status, rv;
678 size_t i;
679 ssize_t r;
680
681 #ifdef BUILTIN_DECOMPRESS
682 /* FIXME: This doesn't cope with bzip2 */
683 if (method == 2)
684 return uncompressgzipped(old, newch, bytes_max, n);
685 if (compr[method].maglen == 0)
686 return uncompresszlib(old, newch, bytes_max, n, 1);
687 #endif
688 (void)fflush(stdout);
689 (void)fflush(stderr);
690
691 for (i = 0; i < __arraycount(fdp); i++)
692 fdp[i][0] = fdp[i][1] = -1;
693
694 if ((fd == -1 && pipe(fdp[STDIN_FILENO]) == -1) ||
695 pipe(fdp[STDOUT_FILENO]) == -1 || pipe(fdp[STDERR_FILENO]) == -1) {
696 closep(fdp[STDIN_FILENO]);
697 closep(fdp[STDOUT_FILENO]);
698 return makeerror(newch, n, "Cannot create pipe, %s",
699 strerror(errno));
700 }
701 switch (fork()) {
702 case 0: /* child */
703 if (fd != -1) {
704 fdp[STDIN_FILENO][0] = fd;
705 (void) lseek(fd, (off_t)0, SEEK_SET);
706 }
707
708 for (i = 0; i < __arraycount(fdp); i++)
709 copydesc(CAST(int, i), fdp[i]);
710
711 (void)execvp(compr[method].argv[0],
712 (char *const *)(intptr_t)compr[method].argv);
713 dprintf(STDERR_FILENO, "exec `%s' failed, %s",
714 compr[method].argv[0], strerror(errno));
715 exit(1);
716 /*NOTREACHED*/
717 case -1:
718 return makeerror(newch, n, "Cannot fork, %s",
719 strerror(errno));
720
721 default: /* parent */
722 for (i = 1; i < __arraycount(fdp); i++)
723 closefd(fdp[i], 1);
724
725 /* Write the buffer data to the child, if we don't have fd */
726 if (fd == -1)
727 writechild(fdp, old, *n);
728
729 *newch = CAST(unsigned char *, malloc(bytes_max + 1));
730 if (*newch == NULL) {
731 rv = makeerror(newch, n, "No buffer, %s",
732 strerror(errno));
733 goto err;
734 }
735 rv = OKDATA;
736 if ((r = sread(fdp[STDOUT_FILENO][0], *newch, bytes_max, 0)) > 0)
737 break;
738 DPRINTF("Read stdout failed %d (%s)\n", fdp[STDOUT_FILENO][0],
739 r != -1 ? strerror(errno) : "no data");
740
741 rv = ERRDATA;
742 if (r == 0 &&
743 (r = sread(fdp[STDERR_FILENO][0], *newch, bytes_max, 0)) > 0)
744 {
745 r = filter_error(*newch, r);
746 break;
747 }
748 free(*newch);
749 if (r == 0)
750 rv = makeerror(newch, n, "Read failed, %s",
751 strerror(errno));
752 else
753 rv = makeerror(newch, n, "No data");
754 goto err;
755 }
756
757 *n = r;
758 /* NUL terminate, as every buffer is handled here. */
759 (*newch)[*n] = '\0';
760 err:
761 closefd(fdp[STDIN_FILENO], 1);
762 closefd(fdp[STDOUT_FILENO], 0);
763 closefd(fdp[STDERR_FILENO], 0);
764 if (wait(&status) == -1) {
765 free(*newch);
766 rv = makeerror(newch, n, "Wait failed, %s", strerror(errno));
767 DPRINTF("Child wait return %#x\n", status);
768 } else if (!WIFEXITED(status)) {
769 DPRINTF("Child not exited (%#x)\n", status);
770 } else if (WEXITSTATUS(status) != 0) {
771 DPRINTF("Child exited (%#x)\n", WEXITSTATUS(status));
772 }
773
774 closefd(fdp[STDIN_FILENO], 0);
775 DPRINTF("Returning %p n=%zu rv=%d\n", *newch, *n, rv);
776
777 return rv;
778 }
779 #endif
780