MFC r267897: MFV r267843:

Update file/libmagic to 5.19.

1 files changed, 524 insertions, 0 deletions

diff --git a/contrib/file/src/magic.c b/contrib/file/src/magic.c
new file mode 100644
index 0000000..e4bd12b
--- /dev/null
+++ b/contrib/file/src/magic.c
@@ -0,0 +1,524 @@
+/*
+ * Copyright (c) Christos Zoulas 2003.
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice immediately at the beginning of the file, without modification,
+ *    this list of conditions, and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifdef WIN32
+#include <windows.h>
+#include <shlwapi.h>
+#endif
+
+#include "file.h"
+
+#ifndef	lint
+FILE_RCSID("@(#)$File: magic.c,v 1.84 2014/05/14 23:15:42 christos Exp $")
+#endif	/* lint */
+
+#include "magic.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#ifdef QUICK
+#include <sys/mman.h>
+#endif
+#ifdef HAVE_LIMITS_H
+#include <limits.h>	/* for PIPE_BUF */
+#endif
+
+#if defined(HAVE_UTIMES)
+# include <sys/time.h>
+#elif defined(HAVE_UTIME)
+# if defined(HAVE_SYS_UTIME_H)
+#  include <sys/utime.h>
+# elif defined(HAVE_UTIME_H)
+#  include <utime.h>
+# endif
+#endif
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>	/* for read() */
+#endif
+
+#ifndef PIPE_BUF
+/* Get the PIPE_BUF from pathconf */
+#ifdef _PC_PIPE_BUF
+#define PIPE_BUF pathconf(".", _PC_PIPE_BUF)
+#else
+#define PIPE_BUF 512
+#endif
+#endif
+
+private void close_and_restore(const struct magic_set *, const char *, int,
+    const struct stat *);
+private int unreadable_info(struct magic_set *, mode_t, const char *);
+private const char* get_default_magic(void);
+#ifndef COMPILE_ONLY
+private const char *file_or_fd(struct magic_set *, const char *, int);
+#endif
+
+#ifndef	STDIN_FILENO
+#define	STDIN_FILENO	0
+#endif
+
+private const char *
+get_default_magic(void)
+{
+	static const char hmagic[] = "/.magic/magic.mgc";
+	static char *default_magic;
+	char *home, *hmagicpath;
+
+#ifndef WIN32
+	struct stat st;
+
+	if (default_magic) {
+		free(default_magic);
+		default_magic = NULL;
+	}
+	if ((home = getenv("HOME")) == NULL)
+		return MAGIC;
+
+	if (asprintf(&hmagicpath, "%s/.magic.mgc", home) < 0)
+		return MAGIC;
+	if (stat(hmagicpath, &st) == -1) {
+		free(hmagicpath);
+		if (asprintf(&hmagicpath, "%s/.magic", home) < 0)
+			return MAGIC;
+		if (stat(hmagicpath, &st) == -1)
+			goto out;
+		if (S_ISDIR(st.st_mode)) {
+			free(hmagicpath);
+			if (asprintf(&hmagicpath, "%s/%s", home, hmagic) < 0)
+				return MAGIC;
+			if (access(hmagicpath, R_OK) == -1)
+				goto out;
+		}
+	}
+
+	if (asprintf(&default_magic, "%s:%s", hmagicpath, MAGIC) < 0)
+		goto out;
+	free(hmagicpath);
+	return default_magic;
+out:
+	default_magic = NULL;
+	free(hmagicpath);
+	return MAGIC;
+#else
+	char *hmagicp;
+	char *tmppath = NULL;
+	hmagicpath = NULL;
+
+#define APPENDPATH() \
+	do { \
+		if (tmppath && access(tmppath, R_OK) != -1) { \
+			if (hmagicpath == NULL) \
+				hmagicpath = tmppath; \
+			else { \
+				if (asprintf(&hmagicp, "%s%c%s", hmagicpath, \
+				    PATHSEP, tmppath) >= 0) { \
+					free(hmagicpath); \
+					hmagicpath = hmagicp; \
+				} \
+				free(tmppath); \
+			} \
+			tmppath = NULL; \
+		} \
+	} while (/*CONSTCOND*/0)
+				
+	if (default_magic) {
+		free(default_magic);
+		default_magic = NULL;
+	}
+
+	/* First, try to get user-specific magic file */
+	if ((home = getenv("LOCALAPPDATA")) == NULL) {
+		if ((home = getenv("USERPROFILE")) != NULL)
+			if (asprintf(&tmppath,
+			    "%s/Local Settings/Application Data%s", home,
+			    hmagic) < 0)
+				tmppath = NULL;
+	} else {
+		if (asprintf(&tmppath, "%s%s", home, hmagic) < 0)
+			tmppath = NULL;
+	}
+
+	APPENDPATH();
+
+	/* Second, try to get a magic file from Common Files */
+	if ((home = getenv("COMMONPROGRAMFILES")) != NULL) {
+		if (asprintf(&tmppath, "%s%s", home, hmagic) >= 0)
+			APPENDPATH();
+	}
+
+	/* Third, try to get magic file relative to dll location */
+	LPTSTR dllpath = malloc(sizeof(*dllpath) * (MAX_PATH + 1));
+	dllpath[MAX_PATH] = 0;	/* just in case long path gets truncated and not null terminated */
+	if (GetModuleFileNameA(NULL, dllpath, MAX_PATH)){
+		PathRemoveFileSpecA(dllpath);
+		if (strlen(dllpath) > 3 &&
+		    stricmp(&dllpath[strlen(dllpath) - 3], "bin") == 0) {
+			if (asprintf(&tmppath,
+			    "%s/../share/misc/magic.mgc", dllpath) >= 0)
+				APPENDPATH();
+		} else {
+			if (asprintf(&tmppath,
+			    "%s/share/misc/magic.mgc", dllpath) >= 0)
+				APPENDPATH();
+			else if (asprintf(&tmppath,
+			    "%s/magic.mgc", dllpath) >= 0)
+				APPENDPATH();
+		}
+	}
+
+	/* Don't put MAGIC constant - it likely points to a file within MSys
+	tree */
+	default_magic = hmagicpath;
+	return default_magic;
+#endif
+}
+
+public const char *
+magic_getpath(const char *magicfile, int action)
+{
+	if (magicfile != NULL)
+		return magicfile;
+
+	magicfile = getenv("MAGIC");
+	if (magicfile != NULL)
+		return magicfile;
+
+	return action == FILE_LOAD ? get_default_magic() : MAGIC;
+}
+
+public struct magic_set *
+magic_open(int flags)
+{
+	return file_ms_alloc(flags);
+}
+
+private int
+unreadable_info(struct magic_set *ms, mode_t md, const char *file)
+{
+	if (file) {
+		/* We cannot open it, but we were able to stat it. */
+		if (access(file, W_OK) == 0)
+			if (file_printf(ms, "writable, ") == -1)
+				return -1;
+		if (access(file, X_OK) == 0)
+			if (file_printf(ms, "executable, ") == -1)
+				return -1;
+	}
+	if (S_ISREG(md))
+		if (file_printf(ms, "regular file, ") == -1)
+			return -1;
+	if (file_printf(ms, "no read permission") == -1)
+		return -1;
+	return 0;
+}
+
+public void
+magic_close(struct magic_set *ms)
+{
+	if (ms == NULL)
+		return;
+	file_ms_free(ms);
+}
+
+/*
+ * load a magic file
+ */
+public int
+magic_load(struct magic_set *ms, const char *magicfile)
+{
+	if (ms == NULL)
+		return -1;
+	return file_apprentice(ms, magicfile, FILE_LOAD);
+}
+
+public int
+magic_compile(struct magic_set *ms, const char *magicfile)
+{
+	if (ms == NULL)
+		return -1;
+	return file_apprentice(ms, magicfile, FILE_COMPILE);
+}
+
+public int
+magic_check(struct magic_set *ms, const char *magicfile)
+{
+	if (ms == NULL)
+		return -1;
+	return file_apprentice(ms, magicfile, FILE_CHECK);
+}
+
+public int
+magic_list(struct magic_set *ms, const char *magicfile)
+{
+	if (ms == NULL)
+		return -1;
+	return file_apprentice(ms, magicfile, FILE_LIST);
+}
+
+private void
+close_and_restore(const struct magic_set *ms, const char *name, int fd,
+    const struct stat *sb)
+{
+	if (fd == STDIN_FILENO || name == NULL)
+		return;
+	(void) close(fd);
+
+	if ((ms->flags & MAGIC_PRESERVE_ATIME) != 0) {
+		/*
+		 * Try to restore access, modification times if read it.
+		 * This is really *bad* because it will modify the status
+		 * time of the file... And of course this will affect
+		 * backup programs
+		 */
+#ifdef HAVE_UTIMES
+		struct timeval  utsbuf[2];
+		(void)memset(utsbuf, 0, sizeof(utsbuf));
+		utsbuf[0].tv_sec = sb->st_atime;
+		utsbuf[1].tv_sec = sb->st_mtime;
+
+		(void) utimes(name, utsbuf); /* don't care if loses */
+#elif defined(HAVE_UTIME_H) || defined(HAVE_SYS_UTIME_H)
+		struct utimbuf  utbuf;
+
+		(void)memset(&utbuf, 0, sizeof(utbuf));
+		utbuf.actime = sb->st_atime;
+		utbuf.modtime = sb->st_mtime;
+		(void) utime(name, &utbuf); /* don't care if loses */
+#endif
+	}
+}
+
+#ifndef COMPILE_ONLY
+
+/*
+ * find type of descriptor
+ */
+public const char *
+magic_descriptor(struct magic_set *ms, int fd)
+{
+	if (ms == NULL)
+		return NULL;
+	return file_or_fd(ms, NULL, fd);
+}
+
+/*
+ * find type of named file
+ */
+public const char *
+magic_file(struct magic_set *ms, const char *inname)
+{
+	if (ms == NULL)
+		return NULL;
+	return file_or_fd(ms, inname, STDIN_FILENO);
+}
+
+private const char *
+file_or_fd(struct magic_set *ms, const char *inname, int fd)
+{
+	int	rv = -1;
+	unsigned char *buf;
+	struct stat	sb;
+	ssize_t nbytes = 0;	/* number of bytes read from a datafile */
+	int	ispipe = 0;
+	off_t	pos = (off_t)-1;
+
+	if (file_reset(ms) == -1)
+		goto out;
+
+	/*
+	 * one extra for terminating '\0', and
+	 * some overlapping space for matches near EOF
+	 */
+#define SLOP (1 + sizeof(union VALUETYPE))
+	if ((buf = CAST(unsigned char *, malloc(HOWMANY + SLOP))) == NULL)
+		return NULL;
+
+	switch (file_fsmagic(ms, inname, &sb)) {
+	case -1:		/* error */
+		goto done;
+	case 0:			/* nothing found */
+		break;
+	default:		/* matched it and printed type */
+		rv = 0;
+		goto done;
+	}
+
+#ifdef WIN32
+	/* Place stdin in binary mode, so EOF (Ctrl+Z) doesn't stop early. */
+	if (fd == STDIN_FILENO)
+		_setmode(STDIN_FILENO, O_BINARY);
+#endif
+
+	if (inname == NULL) {
+		if (fstat(fd, &sb) == 0 && S_ISFIFO(sb.st_mode))
+			ispipe = 1;
+		else
+			pos = lseek(fd, (off_t)0, SEEK_CUR);
+	} else {
+		int flags = O_RDONLY|O_BINARY;
+		int okstat = stat(inname, &sb) == 0;
+
+		if (okstat && S_ISFIFO(sb.st_mode)) {
+#ifdef O_NONBLOCK
+			flags |= O_NONBLOCK;
+#endif
+			ispipe = 1;
+		}
+
+		errno = 0;
+		if ((fd = open(inname, flags)) < 0) {
+#ifdef WIN32
+			/*
+			 * Can't stat, can't open.  It may have been opened in
+			 * fsmagic, so if the user doesn't have read permission,
+			 * allow it to say so; otherwise an error was probably
+			 * displayed in fsmagic.
+			 */
+			if (!okstat && errno == EACCES) {
+				sb.st_mode = S_IFBLK;
+				okstat = 1;
+			}
+#endif
+			if (okstat &&
+			    unreadable_info(ms, sb.st_mode, inname) == -1)
+				goto done;
+			rv = 0;
+			goto done;
+		}
+#ifdef O_NONBLOCK
+		if ((flags = fcntl(fd, F_GETFL)) != -1) {
+			flags &= ~O_NONBLOCK;
+			(void)fcntl(fd, F_SETFL, flags);
+		}
+#endif
+	}
+
+	/*
+	 * try looking at the first HOWMANY bytes
+	 */
+	if (ispipe) {
+		ssize_t r = 0;
+
+		while ((r = sread(fd, (void *)&buf[nbytes],
+		    (size_t)(HOWMANY - nbytes), 1)) > 0) {
+			nbytes += r;
+			if (r < PIPE_BUF) break;
+		}
+
+		if (nbytes == 0) {
+			/* We can not read it, but we were able to stat it. */
+			if (unreadable_info(ms, sb.st_mode, inname) == -1)
+				goto done;
+			rv = 0;
+			goto done;
+		}
+
+	} else {
+		/* Windows refuses to read from a big console buffer. */
+		size_t howmany =
+#if defined(WIN32) && HOWMANY > 8 * 1024
+				_isatty(fd) ? 8 * 1024 :
+#endif
+				HOWMANY;
+		if ((nbytes = read(fd, (char *)buf, howmany)) == -1) {
+			if (inname == NULL && fd != STDIN_FILENO)
+				file_error(ms, errno, "cannot read fd %d", fd);
+			else
+				file_error(ms, errno, "cannot read `%s'",
+				    inname == NULL ? "/dev/stdin" : inname);
+			goto done;
+		}
+	}
+
+	(void)memset(buf + nbytes, 0, SLOP); /* NUL terminate */
+	if (file_buffer(ms, fd, inname, buf, (size_t)nbytes) == -1)
+		goto done;
+	rv = 0;
+done:
+	free(buf);
+	if (pos != (off_t)-1)
+		(void)lseek(fd, pos, SEEK_SET);
+	close_and_restore(ms, inname, fd, &sb);
+out:
+	return rv == 0 ? file_getbuffer(ms) : NULL;
+}
+
+
+public const char *
+magic_buffer(struct magic_set *ms, const void *buf, size_t nb)
+{
+	if (ms == NULL)
+		return NULL;
+	if (file_reset(ms) == -1)
+		return NULL;
+	/*
+	 * The main work is done here!
+	 * We have the file name and/or the data buffer to be identified.
+	 */
+	if (file_buffer(ms, -1, NULL, buf, nb) == -1) {
+		return NULL;
+	}
+	return file_getbuffer(ms);
+}
+#endif
+
+public const char *
+magic_error(struct magic_set *ms)
+{
+	if (ms == NULL)
+		return "Magic database is not open";
+	return (ms->event_flags & EVENT_HAD_ERR) ? ms->o.buf : NULL;
+}
+
+public int
+magic_errno(struct magic_set *ms)
+{
+	if (ms == NULL)
+		return EINVAL;
+	return (ms->event_flags & EVENT_HAD_ERR) ? ms->error : 0;
+}
+
+public int
+magic_setflags(struct magic_set *ms, int flags)
+{
+	if (ms == NULL)
+		return -1;
+#if !defined(HAVE_UTIME) && !defined(HAVE_UTIMES)
+	if (flags & MAGIC_PRESERVE_ATIME)
+		return -1;
+#endif
+	ms->flags = flags;
+	return 0;
+}
+
+public int
+magic_version(void)
+{
+	return MAGIC_VERSION;
+}