#include "file.h"
#ifndef lint
FILE_RCSID("@(#)$File: fsmagic.c,v 1.60 2009/05/08 17:41:59 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 MAJOR_IN_SYSMACROS
# include <sys/sysmacros.h>
# define HAVE_MAJOR
#endif
#ifdef major
# define HAVE_MAJOR
#endif
#ifndef HAVE_MAJOR
# define major(dev) (((dev) >> 8) & 0xff)
# define minor(dev) ((dev) & 0xff)
#endif
#undef HAVE_MAJOR
private int
bad_link(struct magic_set *ms, int err, char *buf)
{
const char *errfmt;
int mime = ms->flags & MAGIC_MIME;
if ((mime & MAGIC_MIME_TYPE) &&
file_printf(ms, "application/x-symlink")
== -1)
return -1;
else if (!mime) {
if (err == ELOOP)
errfmt = "symbolic link in a loop";
else
errfmt = "broken symbolic link to %s";
if (ms->flags & MAGIC_ERROR) {
file_error(ms, err, errfmt, buf);
return -1;
}
if (file_printf(ms, errfmt, buf) == -1)
return -1;
}
return 1;
}
private int
handle_mime(struct magic_set *ms, int mime, const char *str)
{
if ((mime & MAGIC_MIME_TYPE)) {
if (file_printf(ms, "application/%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 = 0;
int mime = ms->flags & MAGIC_MIME;
#ifdef S_IFLNK
char buf[BUFSIZ+4];
ssize_t nch;
struct stat tstatbuf;
#endif
if (ms->flags & MAGIC_APPLE)
return 0;
if (fn == NULL)
return 0;
#ifdef S_IFLNK
if ((ms->flags & MAGIC_SYMLINK) == 0)
ret = lstat(fn, sb);
else
#endif
ret = stat(fn, sb);
#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 1;
}
if (!mime) {
#ifdef S_ISUID
if (sb->st_mode & S_ISUID)
if (file_printf(ms, "setuid ") == -1)
return -1;
#endif
#ifdef S_ISGID
if (sb->st_mode & S_ISGID)
if (file_printf(ms, "setgid ") == -1)
return -1;
#endif
#ifdef S_ISVTX
if (sb->st_mode & S_ISVTX)
if (file_printf(ms, "sticky ") == -1)
return -1;
#endif
}
switch (sb->st_mode & S_IFMT) {
case S_IFDIR:
if (mime) {
if (handle_mime(ms, mime, "x-directory") == -1)
return -1;
} else if (file_printf(ms, "directory") == -1)
return -1;
return 1;
#ifdef S_IFCHR
case S_IFCHR:
if ((ms->flags & MAGIC_DEVICES) != 0)
break;
if (mime) {
if (handle_mime(ms, mime, "x-character-device") == -1)
return -1;
} else {
#ifdef HAVE_STAT_ST_RDEV
# ifdef dv_unit
if (file_printf(ms, "character special (%d/%d/%d)",
major(sb->st_rdev), dv_unit(sb->st_rdev),
dv_subunit(sb->st_rdev)) == -1)
return -1;
# else
if (file_printf(ms, "character special (%ld/%ld)",
(long)major(sb->st_rdev), (long)minor(sb->st_rdev))
== -1)
return -1;
# endif
#else
if (file_printf(ms, "character special") == -1)
return -1;
#endif
}
return 1;
#endif
#ifdef S_IFBLK
case S_IFBLK:
if ((ms->flags & MAGIC_DEVICES) != 0)
break;
if (mime) {
if (handle_mime(ms, mime, "x-block-device") == -1)
return -1;
} else {
#ifdef HAVE_STAT_ST_RDEV
# ifdef dv_unit
if (file_printf(ms, "block special (%d/%d/%d)",
major(sb->st_rdev), dv_unit(sb->st_rdev),
dv_subunit(sb->st_rdev)) == -1)
return -1;
# else
if (file_printf(ms, "block special (%ld/%ld)",
(long)major(sb->st_rdev), (long)minor(sb->st_rdev)) == -1)
return -1;
# endif
#else
if (file_printf(ms, "block special") == -1)
return -1;
#endif
}
return 1;
#endif
#ifdef S_IFIFO
case S_IFIFO:
if((ms->flags & MAGIC_DEVICES) != 0)
break;
if (mime) {
if (handle_mime(ms, mime, "x-fifo") == -1)
return -1;
} else if (file_printf(ms, "fifo (named pipe)") == -1)
return -1;
return 1;
#endif
#ifdef S_IFDOOR
case S_IFDOOR:
if (mime) {
if (handle_mime(ms, mime, "x-door") == -1)
return -1;
} else if (file_printf(ms, "door") == -1)
return -1;
return 1;
#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, "x-symlink") == -1)
return -1;
} else if (file_printf(ms,
"unreadable symlink `%s' (%s)", fn,
strerror(errno)) == -1)
return -1;
return 1;
}
buf[nch] = '\0';
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 (file_printf(ms,
"path too long: `%s'", fn) == -1)
return -1;
return 1;
}
(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);
}
if ((ms->flags & MAGIC_SYMLINK) != 0) {
const char *p;
ms->flags &= MAGIC_SYMLINK;
p = magic_file(ms, buf);
ms->flags |= MAGIC_SYMLINK;
return p != NULL ? 1 : -1;
} else {
if (mime) {
if (handle_mime(ms, mime, "x-symlink") == -1)
return -1;
} else if (file_printf(ms, "symbolic link to %s",
buf) == -1)
return -1;
}
return 1;
#endif
#ifdef S_IFSOCK
#ifndef __COHERENT__
case S_IFSOCK:
if (mime) {
if (handle_mime(ms, mime, "x-socket") == -1)
return -1;
} else if (file_printf(ms, "socket") == -1)
return -1;
return 1;
#endif
#endif
case S_IFREG:
if (ms->flags & MAGIC_REGULAR) {
if (file_printf(ms, "regular file") == -1)
return -1;
return 1;
}
break;
default:
file_error(ms, 0, "invalid mode 0%o", sb->st_mode);
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 (file_printf(ms, "empty") == -1)
return -1;
return 1;
}
return 0;
}