1 /* 2 * Copyright (C) 2023 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <sys/cdefs.h> 20 #include <sys/types.h> 21 22 __BEGIN_DECLS 23 24 /* 25 * Perform any required initialization - including opening any required BPF maps. This function 26 * needs to be called before using other functions of this library. 27 * 28 * Returns 0 on success, -EOPNOTSUPP when the function is called on the Android version before 29 * T. Returns a negative POSIX error code (see errno.h) on other failures. 30 */ 31 int ADnsHelper_init(); 32 33 /* 34 * The function reads bpf maps and returns whether the given uid has blocked networking or not. The 35 * function is supported starting from Android T. 36 * 37 * |uid| is a Linux/Android UID to be queried. It is a combination of UserID and AppID. 38 * |metered| indicates whether the uid is currently using a billing network. 39 * 40 * Returns 0(false)/1(true) on success, -EUNATCH when the ADnsHelper_init is not called before 41 * calling this function. Returns a negative POSIX error code (see errno.h) on other failures 42 * that return from bpf syscall. 43 */ 44 int ADnsHelper_isUidNetworkingBlocked(uid_t uid, bool metered); 45 46 __END_DECLS 47