#include "file.h"
#ifndef lint
FILE_RCSID("@(#)$File: fsmagic.c,v 1.80 2019/04/23 18:59:27 christos Exp $")
#endif
#include "magic.h"
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#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)
# 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
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
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;
}
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++ ? ", " : "")
#ifdef S_IFLNK
if ((ms->flags & MAGIC_SYMLINK) == 0)
ret = lstat(fn, sb);
else
#endif
ret = stat(fn, sb);
#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) {
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
#ifdef S_IFLNK
if (ret && (ms->flags & MAGIC_SYMLINK) != 0) {
ret = lstat(fn, sb);
}
#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 ((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 ((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
#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';
#ifdef __linux__
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 = strrchr(fn, '/')) == NULL) {
tmp = buf;
} 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;
}
(void)strlcpy(buf2, fn, sizeof buf2);
buf2[tmp - fn + 1] = '\0';
(void)strlcat(buf2, buf, sizeof buf2);
tmp = buf2;
}
if (stat(tmp, &tstatbuf) < 0)
return bad_link(ms, errno, buf);
}
#endif
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 {
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:
if (ms->flags & MAGIC_REGULAR) {
if (file_printf(ms, "regular file") == -1)
return -1;
return 1;
}
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;
}
if (!silent && !mime && did && ret == 0) {
if (file_printf(ms, " ") == -1)
return -1;
}
return ret;
}