/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <android_runtime/AndroidRuntime.h>
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#include <nativehelper/JNIHelp.h>
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#include <jni.h>
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#include <nativehelper/ScopedUtfChars.h>
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#include <utils/misc.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <utils/Log.h>
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#include <inttypes.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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namespace android {
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uint64_t get_block_device_size(int fd)
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{
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uint64_t size = 0;
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int ret;
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ret = ioctl(fd, BLKGETSIZE64, &size);
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if (ret)
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return 0;
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return size;
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}
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int wipe_block_device(int fd)
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{
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uint64_t range[2];
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int ret;
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uint64_t len = get_block_device_size(fd);
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range[0] = 0;
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range[1] = len;
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if (range[1] == 0)
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return 0;
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ret = ioctl(fd, BLKSECDISCARD, &range);
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if (ret < 0) {
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ALOGE("Something went wrong secure discarding block: %s\n", strerror(errno));
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range[0] = 0;
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range[1] = len;
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ret = ioctl(fd, BLKDISCARD, &range);
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if (ret < 0) {
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ALOGE("Discard failed: %s\n", strerror(errno));
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return -1;
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} else {
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ALOGE("Wipe via secure discard failed, used non-secure discard instead\n");
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return 0;
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}
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}
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return ret;
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}
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static jlong com_android_server_PersistentDataBlockService_getBlockDeviceSize(JNIEnv *env, jclass, jstring jpath)
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{
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ScopedUtfChars path(env, jpath);
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int fd = open(path.c_str(), O_RDONLY);
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if (fd < 0)
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return 0;
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const uint64_t size = get_block_device_size(fd);
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close(fd);
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return size;
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}
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static int com_android_server_PersistentDataBlockService_wipe(JNIEnv *env, jclass, jstring jpath) {
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ScopedUtfChars path(env, jpath);
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int fd = open(path.c_str(), O_WRONLY);
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if (fd < 0)
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return 0;
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const int ret = wipe_block_device(fd);
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close(fd);
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return ret;
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}
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static const JNINativeMethod sMethods[] = {
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/* name, signature, funcPtr */
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{"nativeGetBlockDeviceSize", "(Ljava/lang/String;)J", (void*)com_android_server_PersistentDataBlockService_getBlockDeviceSize},
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{"nativeWipe", "(Ljava/lang/String;)I", (void*)com_android_server_PersistentDataBlockService_wipe},
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};
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int register_android_server_PersistentDataBlockService(JNIEnv* env)
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{
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return jniRegisterNativeMethods(env, "com/android/server/PersistentDataBlockService",
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sMethods, NELEM(sMethods));
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}
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} /* namespace android */
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