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/*
* Copyright (C) 2010 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.
*/
#include <android_runtime/AndroidRuntime.h>
#include <JNIHelp.h>
#include <jni.h>
#include <ScopedUtfChars.h>
#include <utils/misc.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <utils/Log.h>
#include <inttypes.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
namespace android {
uint64_t get_block_device_size(int fd)
{
uint64_t size = 0;
int ret;
ret = ioctl(fd, BLKGETSIZE64, &size);
if (ret)
return 0;
return size;
}
int wipe_block_device(int fd)
{
uint64_t range[2];
int ret;
uint64_t len = get_block_device_size(fd);
range[0] = 0;
range[1] = len;
if (range[1] == 0)
return 0;
ret = ioctl(fd, BLKSECDISCARD, &range);
if (ret < 0) {
ALOGE("Something went wrong secure discarding block: %s\n", strerror(errno));
range[0] = 0;
range[1] = len;
ret = ioctl(fd, BLKDISCARD, &range);
if (ret < 0) {
ALOGE("Discard failed: %s\n", strerror(errno));
return -1;
} else {
ALOGE("Wipe via secure discard failed, used non-secure discard instead\n");
return 0;
}
}
return ret;
}
static jlong com_android_server_PersistentDataBlockService_getBlockDeviceSize(JNIEnv *env, jclass, jstring jpath)
{
ScopedUtfChars path(env, jpath);
int fd = open(path.c_str(), O_RDONLY);
if (fd < 0)
return 0;
const uint64_t size = get_block_device_size(fd);
close(fd);
return size;
}
static int com_android_server_PersistentDataBlockService_wipe(JNIEnv *env, jclass, jstring jpath) {
ScopedUtfChars path(env, jpath);
int fd = open(path.c_str(), O_WRONLY);
if (fd < 0)
return 0;
const int ret = wipe_block_device(fd);
close(fd);
return ret;
}
static JNINativeMethod sMethods[] = {
/* name, signature, funcPtr */
{"nativeGetBlockDeviceSize", "(Ljava/lang/String;)J", (void*)com_android_server_PersistentDataBlockService_getBlockDeviceSize},
{"nativeWipe", "(Ljava/lang/String;)I", (void*)com_android_server_PersistentDataBlockService_wipe},
};
int register_android_server_PersistentDataBlockService(JNIEnv* env)
{
return jniRegisterNativeMethods(env, "com/android/server/PersistentDataBlockService",
sMethods, NELEM(sMethods));
}
} /* namespace android */
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