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1 /*
2  * Copyright (C) 2016 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 <stdint.h>
20 
21 #define MAXNS 4            // max # name servers we'll track
22 #define MAXDNSRCH 6        // max # domains in search path
23 #define MAXDNSRCHPATH 256  // max length of domain search paths
24 #define MAXNSSAMPLES 64    // max # samples to store per server
25 
26 // Per-netid configuration parameters passed from netd to the resolver
27 struct res_params {
28     uint16_t sample_validity;  // sample lifetime in s
29     // threshold of success / total samples below which a server is considered broken
30     uint8_t success_threshold;  // 0: disable, value / 100 otherwise
31     uint8_t min_samples;        // min # samples needed for statistics to be considered meaningful
32     uint8_t max_samples;        // max # samples taken into account for statistics
33     int base_timeout_msec;      // base query retry timeout (if 0, use RES_TIMEOUT)
34     int retry_count;            // number of retries
35 };
36