Adding upstream version 1:5.44.upstream/1%5.44upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 435 insertions, 0 deletions

diff --git a/src/fsmagic.c b/src/fsmagic.c
new file mode 100644
index 0000000..5a13dbd
--- /dev/null
+++ b/src/fsmagic.c
@@ -0,0 +1,435 @@
+/*
+ * Copyright (c) Ian F. Darwin 1986-1995.
+ * Software written by Ian F. Darwin and others;
+ * maintained 1995-present by Christos Zoulas and others.
+ *
+ * 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.
+ */
+/*
+ * fsmagic - magic based on filesystem info - directory, special files, etc.
+ */
+
+#include "file.h"
+
+#ifndef	lint
+FILE_RCSID("@(#)$File: fsmagic.c,v 1.85 2022/12/26 17:31:14 christos Exp $")
+#endif	/* lint */
+
+#include "magic.h"
+#include <string.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <stdlib.h>
+/* Since major is a function on SVR4, we cannot use `ifndef major'.  */
+#ifdef MAJOR_IN_MKDEV
+# include <sys/mkdev.h>
+# define HAVE_MAJOR
+#endif
+#ifdef HAVE_SYS_SYSMACROS_H
+# include <sys/sysmacros.h>
+#endif
+#ifdef MAJOR_IN_SYSMACROS
+# define HAVE_MAJOR
+#endif
+#if defined(major) && !defined(HAVE_MAJOR)
+/* Might be defined in sys/types.h.  */
+# define HAVE_MAJOR
+#endif
+#ifdef WIN32
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+#endif
+
+#ifndef HAVE_MAJOR
+# define major(dev)  (((dev) >> 8) & 0xff)
+# define minor(dev)  ((dev) & 0xff)
+#endif
+#undef HAVE_MAJOR
+#ifdef	S_IFLNK
+file_private int
+bad_link(struct magic_set *ms, int err, char *buf)
+{
+	int mime = ms->flags & MAGIC_MIME;
+	if ((mime & MAGIC_MIME_TYPE) &&
+	    file_printf(ms, "inode/symlink")
+	    == -1)
+		return -1;
+	else if (!mime) {
+		if (ms->flags & MAGIC_ERROR) {
+			file_error(ms, err,
+				   "broken symbolic link to %s", buf);
+			return -1;
+		}
+		if (file_printf(ms, "broken symbolic link to %s", buf) == -1)
+			return -1;
+	}
+	return 1;
+}
+#endif
+file_private int
+handle_mime(struct magic_set *ms, int mime, const char *str)
+{
+	if ((mime & MAGIC_MIME_TYPE)) {
+		if (file_printf(ms, "inode/%s", str) == -1)
+			return -1;
+		if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms,
+		    "; charset=") == -1)
+			return -1;
+	}
+	if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms, "binary") == -1)
+		return -1;
+	return 0;
+}
+
+file_protected int
+file_fsmagic(struct magic_set *ms, const char *fn, struct stat *sb)
+{
+	int ret, did = 0;
+	int mime = ms->flags & MAGIC_MIME;
+	int silent = ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION);
+#ifdef	S_IFLNK
+	char buf[BUFSIZ+4];
+	ssize_t nch;
+	struct stat tstatbuf;
+#endif
+
+	if (fn == NULL)
+		return 0;
+
+#define COMMA	(did++ ? ", " : "")
+	/*
+	 * Fstat is cheaper but fails for files you don't have read perms on.
+	 * On 4.2BSD and similar systems, use lstat() to identify symlinks.
+	 */
+#ifdef	S_IFLNK
+	if ((ms->flags & MAGIC_SYMLINK) == 0)
+		ret = lstat(fn, sb);
+	else
+#endif
+	ret = stat(fn, sb);	/* don't merge into if; see "ret =" above */
+
+#ifdef WIN32
+	{
+		HANDLE hFile = CreateFile((LPCSTR)fn, 0, FILE_SHARE_DELETE |
+		    FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0,
+		    NULL);
+		if (hFile != INVALID_HANDLE_VALUE) {
+			/*
+			 * Stat failed, but we can still open it - assume it's
+			 * a block device, if nothing else.
+			 */
+			if (ret) {
+				sb->st_mode = S_IFBLK;
+				ret = 0;
+			}
+			switch (GetFileType(hFile)) {
+			case FILE_TYPE_CHAR:
+				sb->st_mode |= S_IFCHR;
+				sb->st_mode &= ~S_IFREG;
+				break;
+			case FILE_TYPE_PIPE:
+				sb->st_mode |= S_IFIFO;
+				sb->st_mode &= ~S_IFREG;
+				break;
+			}
+			CloseHandle(hFile);
+		}
+	}
+#endif
+
+	if (ret) {
+		if (ms->flags & MAGIC_ERROR) {
+			file_error(ms, errno, "cannot stat `%s'", fn);
+			return -1;
+		}
+		if (file_printf(ms, "cannot open `%s' (%s)",
+		    fn, strerror(errno)) == -1)
+			return -1;
+		return 0;
+	}
+
+	ret = 1;
+	if (!mime && !silent) {
+#ifdef S_ISUID
+		if (sb->st_mode & S_ISUID)
+			if (file_printf(ms, "%ssetuid", COMMA) == -1)
+				return -1;
+#endif
+#ifdef S_ISGID
+		if (sb->st_mode & S_ISGID)
+			if (file_printf(ms, "%ssetgid", COMMA) == -1)
+				return -1;
+#endif
+#ifdef S_ISVTX
+		if (sb->st_mode & S_ISVTX)
+			if (file_printf(ms, "%ssticky", COMMA) == -1)
+				return -1;
+#endif
+	}
+
+	switch (sb->st_mode & S_IFMT) {
+	case S_IFDIR:
+		if (mime) {
+			if (handle_mime(ms, mime, "directory") == -1)
+				return -1;
+		} else if (silent) {
+		} else if (file_printf(ms, "%sdirectory", COMMA) == -1)
+			return -1;
+		break;
+#ifdef S_IFCHR
+	case S_IFCHR:
+		/*
+		 * If -s has been specified, treat character special files
+		 * like ordinary files.  Otherwise, just report that they
+		 * are block special files and go on to the next file.
+		 */
+		if ((ms->flags & MAGIC_DEVICES) != 0) {
+			ret = 0;
+			break;
+		}
+		if (mime) {
+			if (handle_mime(ms, mime, "chardevice") == -1)
+				return -1;
+		} else if (silent) {
+		} else {
+#ifdef HAVE_STRUCT_STAT_ST_RDEV
+# ifdef dv_unit
+			if (file_printf(ms, "%scharacter special (%d/%d/%d)",
+			    COMMA, major(sb->st_rdev), dv_unit(sb->st_rdev),
+					dv_subunit(sb->st_rdev)) == -1)
+				return -1;
+# else
+			if (file_printf(ms, "%scharacter special (%ld/%ld)",
+			    COMMA, (long)major(sb->st_rdev),
+			    (long)minor(sb->st_rdev)) == -1)
+				return -1;
+# endif
+#else
+			if (file_printf(ms, "%scharacter special", COMMA) == -1)
+				return -1;
+#endif
+		}
+		break;
+#endif
+#ifdef S_IFBLK
+	case S_IFBLK:
+		/*
+		 * If -s has been specified, treat block special files
+		 * like ordinary files.  Otherwise, just report that they
+		 * are block special files and go on to the next file.
+		 */
+		if ((ms->flags & MAGIC_DEVICES) != 0) {
+			ret = 0;
+			break;
+		}
+		if (mime) {
+			if (handle_mime(ms, mime, "blockdevice") == -1)
+				return -1;
+		} else if (silent) {
+		} else {
+#ifdef HAVE_STRUCT_STAT_ST_RDEV
+# ifdef dv_unit
+			if (file_printf(ms, "%sblock special (%d/%d/%d)",
+			    COMMA, major(sb->st_rdev), dv_unit(sb->st_rdev),
+			    dv_subunit(sb->st_rdev)) == -1)
+				return -1;
+# else
+			if (file_printf(ms, "%sblock special (%ld/%ld)",
+			    COMMA, (long)major(sb->st_rdev),
+			    (long)minor(sb->st_rdev)) == -1)
+				return -1;
+# endif
+#else
+			if (file_printf(ms, "%sblock special", COMMA) == -1)
+				return -1;
+#endif
+		}
+		break;
+#endif
+	/* TODO add code to handle V7 MUX and Blit MUX files */
+#ifdef	S_IFIFO
+	case S_IFIFO:
+		if((ms->flags & MAGIC_DEVICES) != 0)
+			break;
+		if (mime) {
+			if (handle_mime(ms, mime, "fifo") == -1)
+				return -1;
+		} else if (silent) {
+		} else if (file_printf(ms, "%sfifo (named pipe)", COMMA) == -1)
+			return -1;
+		break;
+#endif
+#ifdef	S_IFDOOR
+	case S_IFDOOR:
+		if (mime) {
+			if (handle_mime(ms, mime, "door") == -1)
+				return -1;
+		} else if (silent) {
+		} else if (file_printf(ms, "%sdoor", COMMA) == -1)
+			return -1;
+		break;
+#endif
+#ifdef	S_IFLNK
+	case S_IFLNK:
+		if ((nch = readlink(fn, buf, BUFSIZ-1)) <= 0) {
+			if (ms->flags & MAGIC_ERROR) {
+			    file_error(ms, errno, "unreadable symlink `%s'",
+				fn);
+			    return -1;
+			}
+			if (mime) {
+				if (handle_mime(ms, mime, "symlink") == -1)
+					return -1;
+			} else if (silent) {
+			} else if (file_printf(ms,
+			    "%sunreadable symlink `%s' (%s)", COMMA, fn,
+			    strerror(errno)) == -1)
+				return -1;
+			break;
+		}
+		buf[nch] = '\0';	/* readlink(2) does not do this */
+
+		/* If broken symlink, say so and quit early. */
+#ifdef __linux__
+		/*
+		 * linux procfs/devfs makes symlinks like pipe:[3515864880]
+		 * that we can't stat their readlink output, so stat the
+		 * original filename instead.
+		 */
+		if (stat(fn, &tstatbuf) < 0)
+			return bad_link(ms, errno, buf);
+#else
+		if (*buf == '/') {
+			if (stat(buf, &tstatbuf) < 0)
+				return bad_link(ms, errno, buf);
+		} else {
+			char *tmp;
+			char buf2[BUFSIZ+BUFSIZ+4];
+
+			if ((tmp = CCAST(char *, strrchr(fn,  '/'))) == NULL) {
+				tmp = buf; /* in current directory anyway */
+			} else {
+				if (tmp - fn + 1 > BUFSIZ) {
+					if (ms->flags & MAGIC_ERROR) {
+						file_error(ms, 0,
+						    "path too long: `%s'", buf);
+						return -1;
+					}
+					if (mime) {
+						if (handle_mime(ms, mime,
+						    "x-path-too-long") == -1)
+							return -1;
+					} else if (silent) {
+					} else if (file_printf(ms,
+					    "%spath too long: `%s'", COMMA,
+					    fn) == -1)
+						return -1;
+					break;
+				}
+				/* take dir part */
+				(void)strlcpy(buf2, fn, sizeof buf2);
+				buf2[tmp - fn + 1] = '\0';
+				/* plus (rel) link */
+				(void)strlcat(buf2, buf, sizeof buf2);
+				tmp = buf2;
+			}
+			if (stat(tmp, &tstatbuf) < 0)
+				return bad_link(ms, errno, buf);
+		}
+#endif
+
+		/* Otherwise, handle it. */
+		if ((ms->flags & MAGIC_SYMLINK) != 0) {
+			const char *p;
+			ms->flags &= MAGIC_SYMLINK;
+			p = magic_file(ms, buf);
+			ms->flags |= MAGIC_SYMLINK;
+			if (p == NULL)
+				return -1;
+		} else { /* just print what it points to */
+			if (mime) {
+				if (handle_mime(ms, mime, "symlink") == -1)
+					return -1;
+			} else if (silent) {
+			} else if (file_printf(ms, "%ssymbolic link to %s",
+			    COMMA, buf) == -1)
+				return -1;
+		}
+		break;
+#endif
+#ifdef	S_IFSOCK
+#ifndef __COHERENT__
+	case S_IFSOCK:
+		if (mime) {
+			if (handle_mime(ms, mime, "socket") == -1)
+				return -1;
+		} else if (silent) {
+		} else if (file_printf(ms, "%ssocket", COMMA) == -1)
+			return -1;
+		break;
+#endif
+#endif
+	case S_IFREG:
+		/*
+		 * regular file, check next possibility
+		 *
+		 * If stat() tells us the file has zero length, report here that
+		 * the file is empty, so we can skip all the work of opening and
+		 * reading the file.
+		 * But if the -s option has been given, we skip this
+		 * optimization, since on some systems, stat() reports zero
+		 * size for raw disk partitions. (If the block special device
+		 * really has zero length, the fact that it is empty will be
+		 * detected and reported correctly when we read the file.)
+		 */
+		if ((ms->flags & MAGIC_DEVICES) == 0 && sb->st_size == 0) {
+			if (mime) {
+				if (handle_mime(ms, mime, "x-empty") == -1)
+					return -1;
+			} else if (silent) {
+			} else if (file_printf(ms, "%sempty", COMMA) == -1)
+				return -1;
+			break;
+		}
+		ret = 0;
+		break;
+
+	default:
+		file_error(ms, 0, "invalid mode 0%o", sb->st_mode);
+		return -1;
+		/*NOTREACHED*/
+	}
+
+	if (!silent && !mime && did && ret == 0) {
+	    if (file_printf(ms, " ") == -1)
+		    return -1;
+	}
+	/*
+	 * If we were looking for extensions or apple (silent) it is not our
+	 * job to print here, so don't count this as a match.
+	 */
+	if (ret == 1 && silent)
+		return 0;
+	return ret;
+}