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/*
* Copyright (C) 2009 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 __KEYSTORE_GET_H__
#define __KEYSTORE_GET_H__
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <cutils/sockets.h>
#define KEYSTORE_MESSAGE_SIZE 65535
#ifdef __cplusplus
extern "C" {
#endif
/* This function is provided for native components to get values from keystore.
* Users are required to link against libcutils. Keys and values are 8-bit safe.
* The first two arguments are the key and its length. The third argument
* specifies the buffer to store the retrieved value, which must be an array of
* KEYSTORE_MESSAGE_SIZE bytes. This function returns the length of the value or
* -1 if an error happens. */
static int keystore_get(const char *key, int length, char *value)
{
uint8_t bytes[2] = {length >> 8, length};
uint8_t code = 'g';
int sock;
if (length < 0 || length > KEYSTORE_MESSAGE_SIZE) {
return -1;
}
sock = socket_local_client("keystore", ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_STREAM);
if (sock == -1) {
return -1;
}
if (send(sock, &code, 1, 0) == 1 && send(sock, bytes, 2, 0) == 2 &&
send(sock, key, length, 0) == length && shutdown(sock, SHUT_WR) == 0 &&
recv(sock, &code, 1, 0) == 1 && code == /* NO_ERROR */ 1 &&
recv(sock, &bytes[0], 1, 0) == 1 && recv(sock, &bytes[1], 1, 0) == 1) {
int offset = 0;
length = bytes[0] << 8 | bytes[1];
while (offset < length) {
int n = recv(sock, &value[offset], length - offset, 0);
if (n <= 0) {
length = -1;
break;
}
offset += n;
}
} else {
length = -1;
}
close(sock);
return length;
}
#ifdef __cplusplus
}
#endif
#endif
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