params.h

/*
 * Copyright (C) 2016 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 <stdint.h>

#define MAXNS 4            // max # name servers we'll track
#define MAXDNSRCH 6        // max # domains in search path
#define MAXDNSRCHPATH 256  // max length of domain search paths
#define MAXNSSAMPLES 64    // max # samples to store per server

// Per-netid configuration parameters passed from netd to the resolver
struct res_params {
    uint16_t sample_validity;  // sample lifetime in s
    // threshold of success / total samples below which a server is considered broken
    uint8_t success_threshold;  // 0: disable, value / 100 otherwise
    uint8_t min_samples;        // min # samples needed for statistics to be considered meaningful
    uint8_t max_samples;        // max # samples taken into account for statistics
    int base_timeout_msec;      // base query retry timeout (if 0, use RES_TIMEOUT)
    int retry_count;            // number of retries
};