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1.1 misho 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 "config.h"
36: #include "file.h"
37:
38: #ifndef lint
1.1.1.2 ! misho 39: FILE_RCSID("@(#)$File: compress.c,v 1.68 2011/12/08 12:38:24 rrt Exp $")
1.1 misho 40: #endif
41:
42: #include "magic.h"
43: #include <stdlib.h>
44: #ifdef HAVE_UNISTD_H
45: #include <unistd.h>
46: #endif
47: #include <string.h>
48: #include <errno.h>
49: #include <sys/types.h>
50: #ifndef PHP_WIN32
51: #include <sys/ioctl.h>
52: #endif
53: #ifdef HAVE_SYS_WAIT_H
54: #include <sys/wait.h>
55: #endif
56: #if defined(HAVE_SYS_TIME_H)
57: #include <sys/time.h>
58: #endif
59: #if defined(HAVE_ZLIB_H) && defined(HAVE_LIBZ)
60: #define BUILTIN_DECOMPRESS
61: #include <zlib.h>
62: #endif
63:
64: #undef FIONREAD
65:
66:
67: private const struct {
68: const char magic[8];
69: size_t maglen;
70: const char *argv[3];
71: int silent;
72: } compr[] = {
73: { "\037\235", 2, { "gzip", "-cdq", NULL }, 1 }, /* compressed */
74: /* Uncompress can get stuck; so use gzip first if we have it
75: * Idea from Damien Clark, thanks! */
76: { "\037\235", 2, { "uncompress", "-c", NULL }, 1 }, /* compressed */
77: { "\037\213", 2, { "gzip", "-cdq", NULL }, 1 }, /* gzipped */
78: { "\037\236", 2, { "gzip", "-cdq", NULL }, 1 }, /* frozen */
79: { "\037\240", 2, { "gzip", "-cdq", NULL }, 1 }, /* SCO LZH */
80: /* the standard pack utilities do not accept standard input */
81: { "\037\036", 2, { "gzip", "-cdq", NULL }, 0 }, /* packed */
82: { "PK\3\4", 4, { "gzip", "-cdq", NULL }, 1 }, /* pkzipped, */
83: /* ...only first file examined */
84: { "BZh", 3, { "bzip2", "-cd", NULL }, 1 }, /* bzip2-ed */
85: { "LZIP", 4, { "lzip", "-cdq", NULL }, 1 },
86: { "\3757zXZ\0",6,{ "xz", "-cd", NULL }, 1 }, /* XZ Utils */
1.1.1.2 ! misho 87: { "LRZI", 4, { "lrzip", "-dqo-", NULL }, 1 }, /* LRZIP */
1.1 misho 88: };
89:
90: #define NODATA ((size_t)~0)
91:
92: private ssize_t swrite(int, const void *, size_t);
93: #ifdef PHP_FILEINFO_UNCOMPRESS
94: private size_t uncompressbuf(struct magic_set *, int, size_t,
95: const unsigned char *, unsigned char **, size_t);
96: #ifdef BUILTIN_DECOMPRESS
97: private size_t uncompressgzipped(struct magic_set *, const unsigned char *,
98: unsigned char **, size_t);
99: #endif
100:
101: protected int
102: file_zmagic(struct magic_set *ms, int fd, const char *name,
103: const unsigned char *buf, size_t nbytes)
104: {
105: unsigned char *newbuf = NULL;
106: size_t i, nsz;
107: int rv = 0;
108: int mime = ms->flags & MAGIC_MIME;
109: size_t ncompr;
110:
111: if ((ms->flags & MAGIC_COMPRESS) == 0)
112: return 0;
113:
114: ncompr = sizeof(compr) / sizeof(compr[0]);
115:
116: for (i = 0; i < ncompr; i++) {
117: if (nbytes < compr[i].maglen)
118: continue;
119: if (memcmp(buf, compr[i].magic, compr[i].maglen) == 0 &&
120: (nsz = uncompressbuf(ms, fd, i, buf, &newbuf,
121: nbytes)) != NODATA) {
122: ms->flags &= ~MAGIC_COMPRESS;
123: rv = -1;
124: if (file_buffer(ms, -1, name, newbuf, nsz) == -1)
125: goto error;
126:
127: if (mime == MAGIC_MIME || mime == 0) {
128: if (file_printf(ms, mime ?
129: " compressed-encoding=" : " (") == -1)
130: goto error;
131: }
132:
133: if ((mime == 0 || mime & MAGIC_MIME_ENCODING) &&
134: file_buffer(ms, -1, NULL, buf, nbytes) == -1)
135: goto error;
136:
137: if (!mime && file_printf(ms, ")") == -1)
138: goto error;
139: rv = 1;
140: break;
141: }
142: }
143: error:
144: if (newbuf)
145: efree(newbuf);
146: ms->flags |= MAGIC_COMPRESS;
147: return rv;
148: }
149: #endif
150: /*
151: * `safe' write for sockets and pipes.
152: */
153: private ssize_t
154: swrite(int fd, const void *buf, size_t n)
155: {
1.1.1.2 ! misho 156: ssize_t rv;
1.1 misho 157: size_t rn = n;
158:
159: do
160: switch (rv = write(fd, buf, n)) {
161: case -1:
162: if (errno == EINTR)
163: continue;
164: return -1;
165: default:
166: n -= rv;
1.1.1.2 ! misho 167: buf = CAST(const char *, buf) + rv;
1.1 misho 168: break;
169: }
170: while (n > 0);
171: return rn;
172: }
173:
174:
175: /*
176: * `safe' read for sockets and pipes.
177: */
178: protected ssize_t
179: sread(int fd, void *buf, size_t n, int canbepipe)
180: {
1.1.1.2 ! misho 181: ssize_t rv;
1.1 misho 182: #ifdef FIONREAD
183: int t = 0;
184: #endif
185: size_t rn = n;
186:
187: if (fd == STDIN_FILENO)
188: goto nocheck;
189:
190: #ifdef FIONREAD
191: if ((canbepipe && (ioctl(fd, FIONREAD, &t) == -1)) || (t == 0)) {
192: #ifdef FD_ZERO
193: int cnt;
194: for (cnt = 0;; cnt++) {
195: fd_set check;
196: struct timeval tout = {0, 100 * 1000};
197: int selrv;
198:
199: FD_ZERO(&check);
200: FD_SET(fd, &check);
201:
202: /*
203: * Avoid soft deadlock: do not read if there
204: * is nothing to read from sockets and pipes.
205: */
206: selrv = select(fd + 1, &check, NULL, NULL, &tout);
207: if (selrv == -1) {
208: if (errno == EINTR || errno == EAGAIN)
209: continue;
210: } else if (selrv == 0 && cnt >= 5) {
211: return 0;
212: } else
213: break;
214: }
215: #endif
216: (void)ioctl(fd, FIONREAD, &t);
217: }
218:
219: if (t > 0 && (size_t)t < n) {
220: n = t;
221: rn = n;
222: }
223: #endif
224:
225: nocheck:
226: do
1.1.1.2 ! misho 227: switch ((rv = FINFO_READ_FUNC(fd, buf, n))) {
1.1 misho 228: case -1:
229: if (errno == EINTR)
230: continue;
231: return -1;
232: case 0:
233: return rn - n;
234: default:
235: n -= rv;
236: buf = ((char *)buf) + rv;
237: break;
238: }
239: while (n > 0);
240: return rn;
241: }
242:
243: protected int
244: file_pipe2file(struct magic_set *ms, int fd, const void *startbuf,
245: size_t nbytes)
246: {
247: char buf[4096];
1.1.1.2 ! misho 248: ssize_t r;
! 249: int tfd;
! 250: #ifdef HAVE_MKSTEMP
! 251: int te;
! 252: #endif
1.1 misho 253:
254: (void)strlcpy(buf, "/tmp/file.XXXXXX", sizeof buf);
255: #ifndef HAVE_MKSTEMP
256: {
257: char *ptr = mktemp(buf);
258: tfd = open(ptr, O_RDWR|O_TRUNC|O_EXCL|O_CREAT, 0600);
259: r = errno;
260: (void)unlink(ptr);
261: errno = r;
262: }
263: #else
264: tfd = mkstemp(buf);
1.1.1.2 ! misho 265: te = errno;
1.1 misho 266: (void)unlink(buf);
1.1.1.2 ! misho 267: errno = te;
1.1 misho 268: #endif
269: if (tfd == -1) {
270: file_error(ms, errno,
271: "cannot create temporary file for pipe copy");
272: return -1;
273: }
274:
275: if (swrite(tfd, startbuf, nbytes) != (ssize_t)nbytes)
276: r = 1;
277: else {
278: while ((r = sread(fd, buf, sizeof(buf), 1)) > 0)
279: if (swrite(tfd, buf, (size_t)r) != r)
280: break;
281: }
282:
283: switch (r) {
284: case -1:
285: file_error(ms, errno, "error copying from pipe to temp file");
286: return -1;
287: case 0:
288: break;
289: default:
290: file_error(ms, errno, "error while writing to temp file");
291: return -1;
292: }
293:
294: /*
295: * We duplicate the file descriptor, because fclose on a
296: * tmpfile will delete the file, but any open descriptors
297: * can still access the phantom inode.
298: */
299: if ((fd = dup2(tfd, fd)) == -1) {
300: file_error(ms, errno, "could not dup descriptor for temp file");
301: return -1;
302: }
303: (void)close(tfd);
1.1.1.2 ! misho 304: if (FINFO_LSEEK_FUNC(fd, (off_t)0, SEEK_SET) == (off_t)-1) {
1.1 misho 305: file_badseek(ms);
306: return -1;
307: }
308: return fd;
309: }
310:
311: #ifdef PHP_FILEINFO_UNCOMPRESS
312: #ifdef BUILTIN_DECOMPRESS
313:
314: #define FHCRC (1 << 1)
315: #define FEXTRA (1 << 2)
316: #define FNAME (1 << 3)
317: #define FCOMMENT (1 << 4)
318:
319: private size_t
320: uncompressgzipped(struct magic_set *ms, const unsigned char *old,
321: unsigned char **newch, size_t n)
322: {
323: unsigned char flg = old[3];
324: size_t data_start = 10;
325: z_stream z;
326: int rc;
327:
328: if (flg & FEXTRA) {
329: if (data_start+1 >= n)
330: return 0;
331: data_start += 2 + old[data_start] + old[data_start + 1] * 256;
332: }
333: if (flg & FNAME) {
334: while(data_start < n && old[data_start])
335: data_start++;
336: data_start++;
337: }
338: if(flg & FCOMMENT) {
339: while(data_start < n && old[data_start])
340: data_start++;
341: data_start++;
342: }
343: if(flg & FHCRC)
344: data_start += 2;
345:
346: if (data_start >= n)
347: return 0;
348: *newch = (unsigned char *)emalloc(HOWMANY + 1));
349:
350: /* XXX: const castaway, via strchr */
351: z.next_in = (Bytef *)strchr((const char *)old + data_start,
352: old[data_start]);
1.1.1.2 ! misho 353: z.avail_in = CAST(uint32_t, (n - data_start));
1.1 misho 354: z.next_out = *newch;
355: z.avail_out = HOWMANY;
356: z.zalloc = Z_NULL;
357: z.zfree = Z_NULL;
358: z.opaque = Z_NULL;
359:
1.1.1.2 ! misho 360: /* LINTED bug in header macro */
1.1 misho 361: rc = inflateInit2(&z, -15);
362: if (rc != Z_OK) {
363: file_error(ms, 0, "zlib: %s", z.msg);
364: return 0;
365: }
366:
367: rc = inflate(&z, Z_SYNC_FLUSH);
368: if (rc != Z_OK && rc != Z_STREAM_END) {
369: file_error(ms, 0, "zlib: %s", z.msg);
370: return 0;
371: }
372:
373: n = (size_t)z.total_out;
374: (void)inflateEnd(&z);
375:
376: /* let's keep the nul-terminate tradition */
377: (*newch)[n] = '\0';
378:
379: return n;
380: }
381: #endif
382:
383: private size_t
384: uncompressbuf(struct magic_set *ms, int fd, size_t method,
385: const unsigned char *old, unsigned char **newch, size_t n)
386: {
387: int fdin[2], fdout[2];
1.1.1.2 ! misho 388: ssize_t r;
! 389: pid_t pid;
1.1 misho 390:
391: #ifdef BUILTIN_DECOMPRESS
392: /* FIXME: This doesn't cope with bzip2 */
393: if (method == 2)
394: return uncompressgzipped(ms, old, newch, n);
395: #endif
396: (void)fflush(stdout);
397: (void)fflush(stderr);
398:
399: if ((fd != -1 && pipe(fdin) == -1) || pipe(fdout) == -1) {
400: file_error(ms, errno, "cannot create pipe");
401: return NODATA;
402: }
1.1.1.2 ! misho 403: switch (pid = fork()) {
1.1 misho 404: case 0: /* child */
405: (void) close(0);
406: if (fd != -1) {
407: (void) dup(fd);
1.1.1.2 ! misho 408: (void) FINFO_LSEEK_FUNC(0, (off_t)0, SEEK_SET);
1.1 misho 409: } else {
410: (void) dup(fdin[0]);
411: (void) close(fdin[0]);
412: (void) close(fdin[1]);
413: }
414:
415: (void) close(1);
416: (void) dup(fdout[1]);
417: (void) close(fdout[0]);
418: (void) close(fdout[1]);
419: #ifndef DEBUG
420: if (compr[method].silent)
421: (void)close(2);
422: #endif
423:
424: (void)execvp(compr[method].argv[0],
425: (char *const *)(intptr_t)compr[method].argv);
426: #ifdef DEBUG
427: (void)fprintf(stderr, "exec `%s' failed (%s)\n",
428: compr[method].argv[0], strerror(errno));
429: #endif
430: exit(1);
431: /*NOTREACHED*/
432: case -1:
433: file_error(ms, errno, "could not fork");
434: return NODATA;
435:
436: default: /* parent */
437: (void) close(fdout[1]);
438: if (fd == -1) {
439: (void) close(fdin[0]);
440: /*
441: * fork again, to avoid blocking because both
442: * pipes filled
443: */
444: switch (fork()) {
445: case 0: /* child */
446: (void)close(fdout[0]);
447: if (swrite(fdin[1], old, n) != (ssize_t)n) {
448: #ifdef DEBUG
449: (void)fprintf(stderr,
450: "Write failed (%s)\n",
451: strerror(errno));
452: #endif
453: exit(1);
454: }
455: exit(0);
456: /*NOTREACHED*/
457:
458: case -1:
459: #ifdef DEBUG
460: (void)fprintf(stderr, "Fork failed (%s)\n",
461: strerror(errno));
462: #endif
463: exit(1);
464: /*NOTREACHED*/
465:
466: default: /* parent */
467: break;
468: }
469: (void) close(fdin[1]);
470: fdin[1] = -1;
471: }
472:
473: *newch = (unsigned char *) emalloc(HOWMANY + 1);
474:
475: if ((r = sread(fdout[0], *newch, HOWMANY, 0)) <= 0) {
476: #ifdef DEBUG
477: (void)fprintf(stderr, "Read failed (%s)\n",
478: strerror(errno));
479: #endif
480: efree(*newch);
481: n = 0;
482: newch[0] = '\0';
483: goto err;
484: } else {
485: n = r;
486: }
487: /* NUL terminate, as every buffer is handled here. */
488: (*newch)[n] = '\0';
489: err:
490: if (fdin[1] != -1)
491: (void) close(fdin[1]);
492: (void) close(fdout[0]);
493: #ifdef WNOHANG
1.1.1.2 ! misho 494: while (waitpid(pid, NULL, WNOHANG) != -1)
1.1 misho 495: continue;
496: #else
497: (void)wait(NULL);
498: #endif
499: (void) close(fdin[0]);
500:
501: return n;
502: }
503: }
504: #endif /* if PHP_FILEINFO_UNCOMPRESS */