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