64 lines
2.5 KiB
C
64 lines
2.5 KiB
C
/*
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* Copyright (C) 2016 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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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/socket.h>
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#include <time.h>
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#include "params.h"
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#define RCODE_INTERNAL_ERROR 254
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#define RCODE_TIMEOUT 255
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struct res_sample {
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time_t at; // time in s at which the sample was recorded
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uint16_t rtt; // round-trip time in ms
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uint8_t rcode; // the DNS rcode or RCODE_XXX defined above
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};
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// Resolver reachability statistics and run-time parameters.
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struct res_stats {
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// Stats of the last <sample_count> queries.
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res_sample samples[MAXNSSAMPLES];
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// The number of samples stored.
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uint8_t sample_count;
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// The next sample to modify.
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uint8_t sample_next;
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};
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// Aggregates the reachability statistics for the given server based on on the stored samples.
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void android_net_res_stats_aggregate(res_stats* stats, int* successes, int* errors, int* timeouts,
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int* internal_errors, int* rtt_avg, time_t* last_sample_time);
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int android_net_res_stats_get_info_for_net(unsigned netid, int* nscount,
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sockaddr_storage servers[MAXNS], int* dcount,
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char domains[MAXDNSRCH][MAXDNSRCHPATH],
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res_params* params, res_stats stats[MAXNS],
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int* wait_for_pending_req_timeout_count);
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// Returns an array of bools indicating which servers are considered good
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int android_net_res_stats_get_usable_servers(const res_params* params, res_stats stats[],
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int nscount, bool valid_servers[]);
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// Calculate the round-trip-time from start time t0 and end time t1.
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int res_stats_calculate_rtt(const timespec* t1, const timespec* t0);
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// Create a sample for calculating server reachability statistics.
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void res_stats_set_sample(res_sample* sample, time_t now, int rcode, int rtt);
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