2 * Copyright (c) Christos Zoulas 2003.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
35 #include <sys/types.h>
36 #include <sys/param.h> /* for MAXPATHLEN */
38 #include <fcntl.h> /* for open() */
43 #if defined(HAVE_UTIMES)
44 # include <sys/time.h>
45 #elif defined(HAVE_UTIME)
46 # if defined(HAVE_SYS_UTIME_H)
47 # include <sys/utime.h>
48 # elif defined(HAVE_UTIME_H)
54 #include <unistd.h> /* for read() */
61 #include <netinet/in.h> /* for byte swapping */
63 #include "patchlevel.h"
66 FILE_RCSID("@(#)$Id: magic.c,v 1.28 2005/06/25 15:52:14 christos Exp $")
70 private char *apptypeName = NULL;
71 protected int file_os2_apptype(struct magic_set *ms, const char *fn,
72 const void *buf, size_t nb);
75 private void free_mlist(struct mlist *);
76 private void close_and_restore(const struct magic_set *, const char *, int,
79 public struct magic_set *
84 if ((ms = malloc(sizeof(struct magic_set))) == NULL)
87 if (magic_setflags(ms, flags) == -1) {
92 ms->o.ptr = ms->o.buf = malloc(ms->o.size = 1024);
93 if (ms->o.buf == NULL)
96 ms->o.pbuf = malloc(ms->o.psize = 1024);
97 if (ms->o.pbuf == NULL)
100 ms->c.off = malloc((ms->c.len = 10) * sizeof(*ms->c.off));
101 if (ms->c.off == NULL)
119 free_mlist(struct mlist *mlist)
126 for (ml = mlist->next; ml != mlist;) {
127 struct mlist *next = ml->next;
128 struct magic *mg = ml->magic;
129 file_delmagic(mg, ml->mapped, ml->nmagic);
138 struct magic_set *ms;
140 free_mlist(ms->mlist);
151 magic_load(struct magic_set *ms, const char *magicfile)
153 struct mlist *ml = file_apprentice(ms, magicfile, FILE_LOAD);
155 free_mlist(ms->mlist);
163 magic_compile(struct magic_set *ms, const char *magicfile)
165 struct mlist *ml = file_apprentice(ms, magicfile, FILE_COMPILE);
171 magic_check(struct magic_set *ms, const char *magicfile)
173 struct mlist *ml = file_apprentice(ms, magicfile, FILE_CHECK);
179 close_and_restore(const struct magic_set *ms, const char *name, int fd,
180 const struct stat *sb)
183 if (fd != STDIN_FILENO && (ms->flags & MAGIC_PRESERVE_ATIME) != 0) {
185 * Try to restore access, modification times if read it.
186 * This is really *bad* because it will modify the status
187 * time of the file... And of course this will affect
191 struct timeval utsbuf[2];
192 utsbuf[0].tv_sec = sb->st_atime;
193 utsbuf[1].tv_sec = sb->st_mtime;
195 (void) utimes(name, utsbuf); /* don't care if loses */
196 #elif defined(HAVE_UTIME_H) || defined(HAVE_SYS_UTIME_H)
197 struct utimbuf utbuf;
199 utbuf.actime = sb->st_atime;
200 utbuf.modtime = sb->st_mtime;
201 (void) utime(name, &utbuf); /* don't care if loses */
208 * find type of named file
211 magic_file(struct magic_set *ms, const char *inname)
217 ssize_t nbytes = 0; /* number of bytes read from a datafile */
220 * one extra for terminating '\0', and
221 * some overlapping space for matches near EOF
223 #define SLOP (1 + sizeof(union VALUETYPE))
224 if ((buf = malloc(HOWMANY + SLOP)) == NULL)
227 if (file_reset(ms) == -1)
230 switch (file_fsmagic(ms, inname, &sb)) {
241 #define STDIN_FILENO 0
245 else if ((fd = open(inname, O_RDONLY)) < 0) {
246 /* We cannot open it, but we were able to stat it. */
247 if (sb.st_mode & 0222)
248 if (file_printf(ms, "writable, ") == -1)
250 if (sb.st_mode & 0111)
251 if (file_printf(ms, "executable, ") == -1)
253 if (S_ISREG(sb.st_mode))
254 if (file_printf(ms, "regular file, ") == -1)
256 if (file_printf(ms, "no read permission") == -1)
263 * try looking at the first HOWMANY bytes
265 if ((nbytes = read(fd, (char *)buf, HOWMANY)) == -1) {
266 file_error(ms, errno, "cannot read `%s'", inname);
271 if (file_printf(ms, (ms->flags & MAGIC_MIME) ?
272 "application/x-empty" : "empty") == -1)
274 } else if (nbytes == 1) {
275 if (file_printf(ms, "very short file (no magic)") == -1)
278 (void)memset(buf + nbytes, 0, SLOP); /* NUL terminate */
280 switch (file_os2_apptype(ms, inname, buf, nbytes)) {
290 if (file_buffer(ms, fd, buf, (size_t)nbytes) == -1)
295 * We matched something in the file, so this *might*
296 * be an ELF file, and the file is at least 5 bytes
297 * long, so if it's an ELF file it has at least one
298 * byte past the ELF magic number - try extracting
299 * information from the ELF headers that cannot easily
300 * be extracted with rules in the magic file.
302 file_tryelf(ms, fd, buf, (size_t)nbytes);
309 close_and_restore(ms, inname, fd, &sb);
310 return rv == 0 ? file_getbuffer(ms) : NULL;
315 magic_buffer(struct magic_set *ms, const void *buf, size_t nb)
317 if (file_reset(ms) == -1)
320 * The main work is done here!
321 * We have the file name and/or the data buffer to be identified.
323 if (file_buffer(ms, -1, buf, nb) == -1) {
326 return file_getbuffer(ms);
331 magic_error(struct magic_set *ms)
333 return ms->haderr ? ms->o.buf : NULL;
337 magic_errno(struct magic_set *ms)
339 return ms->haderr ? ms->error : 0;
343 magic_setflags(struct magic_set *ms, int flags)
345 #if !defined(HAVE_UTIME) && !defined(HAVE_UTIMES)
346 if (flags & MAGIC_PRESERVE_ATIME)