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/**
* @file
* Defines the public interface for file context entries.
*
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
*
* Copyright (C) 2007 Tresys Technology, LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SEFS_ENTRY_H
#define SEFS_ENTRY_H
#ifdef __cplusplus
extern "C"
{
#endif
#include <sys/types.h>
#include <apol/context-query.h>
#include <apol/vector.h>
#ifdef __cplusplus
}
#include <stdexcept>
class sefs_fclist;
struct sefs_context_node;
/**
* This class represents an individual entry within a list an fcfile
* object. Note that the entry's contents (even upon a
* copy-constructed version of the entry) are always tied to its
* fclist, so do not access entries whose fclist has been destroyed.
*/
class sefs_entry
{
friend class sefs_db;
friend class sefs_fcfile;
friend class sefs_filesystem;
public:
/**
* Perform a deep copy of an entry object.
*/
sefs_entry(const sefs_entry * e);
~sefs_entry();
/**
* Get the context from a sefs entry. If the entry has no
* context (such as being marked <tt><<none>></tt>
* in a file_contexts file) then apol_context_get_user() and
* others will return an empty string.
* @return A pointer to the context, or NULL on error. The
* caller should not modify or destroy the returned context.
*/
const apol_context_t *context() const;
/**
* Get the inode number associated with a sefs entry.
* @return Inode number associated with the entry or 0 on
* error. Entries originating from a file_contexts object
* will have no inode and thus return 0.
*/
ino64_t inode() const;
/**
* Get the device name associated with a sefs entry. For
* example, if /dev/sda5 is mounted as /home, the device name
* for entry "/home/gburdell" will be "/dev/sda5".
* @return Device number associated with the entry or NULL on
* error. Do not free() this value. Entries originating from
* a file_contexts object will have no device name and thus
* return NULL.
*/
const char *dev() const;
/**
* Get the object class associated with a sefs entry. The
* returned value will be one of one of QPOL_CLASS_ALL,
* QPOL_CLASS_FILE, etc., as defined in
* <qpol/genfscon_query.h>. If this returns QPOL_CLASS_ALL
* then the entry is associated with all object classes.
* @return Entry's object class. Upon error return
* QPOL_CLASS_ALL.
* @see apol_objclass_to_str() to convert the value to a
* string.
*/
uint32_t objectClass() const;
/**
* Get the paths associated with a sefs entry.
* @return Path for the entry.If the entry came from a
* file_contexts object the paths will be a regular expression
* rather than literal paths. Do not free() this pointer.
*/
const char *path() const;
/**
* Get the file from which a sefs entry originated.
* This function is only meaningful when entries are returned
* from a query on a modular file context file.
* @return The path of the file (policy package or source
* file) providing the entry or NULL if the entry is not from
* a module. Do not free() this pointer.
*/
const char *origin() const;
/**
* Return a string representation of this entry. The string
* is suitable for printing to the screen or to a
* file_contexts file.
* @return An allocated string representation. The caller is
* responsibily for free()ing the string afterwards.
* @exception std::bad_alloc Out of memory.
*/
char *toString() const throw(std::bad_alloc);
private:
/**
* Create a blank entry. The entity creating this entry is
* responsible for setting additional values as needed.
* @param fclist List that will contain this entry. This
* constructor will not add itself to the fclist.
* @param new_context Context node containing the SELinux
* context.
* @param new_objectClass Object class for the entry.
* @param new_path Path to this entry. The entry will share
* this pointer.
* @param new_origin Name of file_contexts file from which
* this entry originated. The entry will share this pointer.
* @exception std::bad_alloc Out of memory.
*/
sefs_entry(class sefs_fclist * fclist, const struct sefs_context_node *new_context, uint32_t new_objectClass,
const char *new_path, const char *new_origin = NULL);
// note that entry does not own any of these pointers; they
// are shallow copies into the fclist's BST
class sefs_fclist *_fclist;
const struct sefs_context_node *_context;
ino64_t _inode;
const char *_dev;
uint32_t _objectClass;
const char *_path, *_origin;
};
extern "C"
{
#endif
//we do not want to wrap two copies of everything so have SWIG ignore
//the compatibility section.
#ifndef SWIG
typedef struct sefs_entry sefs_entry_t;
/**
* Get the context from a sefs entry.
* @see sefs_entry::context()
*/
extern const apol_context_t *sefs_entry_get_context(const sefs_entry_t * ent);
/**
* Get the inode number associated with a sefs entry.
* @see sefs_entry::inode()
*/
extern ino64_t sefs_entry_get_inode(const sefs_entry_t * ent);
/**
* Get the device number associated with a sefs entry.
* @see sefs_entry::dev()
*/
extern const char *sefs_entry_get_dev(const sefs_entry_t * ent);
/**
* Get the object class associated with a sefs entry.
* @see sefs_entry::objectClass()
*/
extern uint32_t sefs_entry_get_object_class(const sefs_entry_t * ent);
/**
* Get the path associated with a sefs entry.
* @see sefs_entry::path()
*/
extern const char *sefs_entry_get_path(const sefs_entry_t * ent);
/**
* Get the file from which a sefs entry originated.
* @see sefs_entry::origin()
*/
extern const char *sefs_entry_get_origin(const sefs_entry_t * ent);
/**
* Return a string representation of this entry.
* @see sefs_entry::toString()
*/
extern char *sefs_entry_to_string(const sefs_entry_t * ent);
#endif /* SWIG */
#ifdef __cplusplus
}
#endif
#endif /* SEFS_ENTRY_H */
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