/*
 * Copyright (C) 2006 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.
 */

#pragma once

#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>

#define ANDROID_SOCKET_ENV_PREFIX "ANDROID_SOCKET_"
#define ANDROID_SOCKET_DIR "/dev/socket"

/*
 * osi_android_get_control_socket - simple helper function to get the file
 * descriptor of our init-managed Unix domain socket. `name' is the name of the
 * socket, as given in init.rc. Returns -1 on error.
 *
 * This is inline and not in libcutils proper because we want to use this in
 * third-party daemons with minimal modification.
 */
static inline int osi_android_get_control_socket(const char* name) {
  char key[64];
  snprintf(key, sizeof(key), ANDROID_SOCKET_ENV_PREFIX "%s", name);

  const char* val = getenv(key);
  if (!val) {
    return -1;
  }

  errno = 0;
  int fd = strtol(val, NULL, 10);
  if (errno) {
    return -1;
  }

  return fd;
}

/*
 * See also android.os.LocalSocketAddress.Namespace
 */
// Linux "abstract" (non-filesystem) namespace
#define ANDROID_SOCKET_NAMESPACE_ABSTRACT 0
// Android "reserved" (/dev/socket) namespace
#define ANDROID_SOCKET_NAMESPACE_RESERVED 1
// Normal filesystem namespace
#define ANDROID_SOCKET_NAMESPACE_FILESYSTEM 2

extern int osi_socket_local_server(const char* name, int namespaceId, int type);
extern int osi_socket_local_server_bind(int s, const char* name,
                                        int namespaceId);
extern int osi_socket_local_client_connect(int fd, const char* name,
                                           int namespaceId, int type);
extern int osi_socket_local_client(const char* name, int namespaceId, int type);