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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef AMEND_PERMISSIONS_H_
#define AMEND_PERMISSIONS_H_
#include <stdbool.h>
#define PERM_NONE (0)
#define PERM_STAT (1<<0)
#define PERM_READ (1<<1)
#define PERM_WRITE (1<<2) // including create, delete, mkdir, rmdir
#define PERM_CHMOD (1<<3)
#define PERM_CHOWN (1<<4)
#define PERM_CHGRP (1<<5)
#define PERM_SETUID (1<<6)
#define PERM_SETGID (1<<7)
#define PERMSET_READ (PERM_STAT | PERM_READ)
#define PERMSET_WRITE (PERMSET_READ | PERM_WRITE)
#define PERMSET_ALL \
(PERM_STAT | PERM_READ | PERM_WRITE | PERM_CHMOD | \
PERM_CHOWN | PERM_CHGRP | PERM_SETUID | PERM_SETGID)
typedef struct {
unsigned int requested;
unsigned int allowed;
const char *path;
bool recursive;
} PermissionRequest;
typedef struct {
PermissionRequest *requests;
int numRequests;
int requestsAllocated;
} PermissionRequestList;
/* Properly clear out a PermissionRequestList.
*
* @return 0 if list is non-NULL, negative otherwise.
*/
int initPermissionRequestList(PermissionRequestList *list);
/* Add a permission request to the list, allocating more space
* if necessary.
*
* @return 0 on success or a negative value on failure.
*/
int addPermissionRequestToList(PermissionRequestList *list,
const char *path, bool recursive, unsigned int permissions);
/* Free anything allocated by addPermissionRequestToList(). The caller
* is responsible for freeing the actual PermissionRequestList.
*/
void freePermissionRequestListElements(PermissionRequestList *list);
/*
* Global permission table
*/
typedef struct {
const char *path;
unsigned int allowed;
} Permission;
int permissionInit(void);
void permissionCleanup(void);
/* Returns the allowed permissions for the path in "outAllowed".
* Returns 0 if successful, negative if a parameter or global state
* is bad.
*/
int getAllowedPermissions(const char *path, bool recursive,
unsigned int *outAllowed);
/* More-recently-registered permissions override older permissions.
*/
int registerPermissionSet(int count, Permission *set);
/* Check to make sure that each request is allowed.
*
* @param requests The list of permission requests
* @param updateAllowed If true, update the "allowed" field in each
* element of the list
* @return the number of requests that were denied, or negative if
* an error occurred.
*/
int countPermissionConflicts(PermissionRequestList *requests,
bool updateAllowed);
/* Inspection/testing/debugging functions
*/
int getPermissionCount(void);
const Permission *getPermissionAt(int index);
#endif // AMEND_PERMISSIONS_H_
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