142 lines
6.3 KiB
C++
142 lines
6.3 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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#include <span>
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#include <unordered_map>
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#include <vector>
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#include <aidl/android/net/IDnsResolver.h>
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#include <aidl/android/net/ResolverOptionsParcel.h>
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#include <netdutils/DumpWriter.h>
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#include <netdutils/InternetAddresses.h>
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#include <stats.pb.h>
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#include "ResolverStats.h"
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#include "params.h"
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#include "stats.h"
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// Sets the name server addresses to the provided ResState.
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// The name servers are retrieved from the cache which is associated
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// with the network to which ResState is associated.
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struct ResState;
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void resolv_populate_res_for_net(ResState* statp);
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std::vector<unsigned> resolv_list_caches();
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std::vector<std::string> resolv_cache_dump_subsampling_map(unsigned netid, bool is_mdns);
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uint32_t resolv_cache_get_subsampling_denom(unsigned netid, int return_code, bool is_mdns);
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typedef enum {
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RESOLV_CACHE_UNSUPPORTED, /* the cache can't handle that kind of queries */
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/* or the answer buffer is too small */
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RESOLV_CACHE_NOTFOUND, /* the cache doesn't know about this query */
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RESOLV_CACHE_FOUND, /* the cache found the answer */
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RESOLV_CACHE_SKIP /* Don't do anything on cache */
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} ResolvCacheStatus;
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ResolvCacheStatus resolv_cache_lookup(unsigned netid, std::span<const uint8_t> query,
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std::span<uint8_t> answer, int* answerlen, uint32_t flags);
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// add a (query,answer) to the cache. If the pair has been in the cache, no new entry will be added
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// in the cache.
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int resolv_cache_add(unsigned netid, std::span<const uint8_t> query,
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std::span<const uint8_t> answer);
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/* Notify the cache a request failed */
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void _resolv_cache_query_failed(unsigned netid, std::span<const uint8_t> query, uint32_t flags);
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// Get a customized table for a given network.
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std::vector<std::string> getCustomizedTableByName(const size_t netid, const char* hostname);
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// Sets name servers for a given network.
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// TODO: Pass all of ResolverParamsParcel and remove the res_params argument.
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int resolv_set_nameservers(unsigned netid, const std::vector<std::string>& servers,
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const std::vector<std::string>& domains, const res_params& params,
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std::optional<aidl::android::net::ResolverOptionsParcel> resolverOptions,
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const std::vector<int32_t>& transportTypes = {});
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// Sets options for a given network.
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int resolv_set_options(unsigned netid, const aidl::android::net::ResolverOptionsParcel& options);
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// Creates the cache associated with the given network.
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int resolv_create_cache_for_net(unsigned netid);
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// Deletes the cache associated with the given network.
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void resolv_delete_cache_for_net(unsigned netid);
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// Flushes the cache associated with the given network.
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int resolv_flush_cache_for_net(unsigned netid);
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// Get transport types to a given network.
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android::net::NetworkType resolv_get_network_types_for_net(unsigned netid);
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// Return true if the pass-in network types support mdns.
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bool is_mdns_supported_transport_types(const std::vector<int32_t>& transportTypes);
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// Return true if the network can support mdns resolution.
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bool is_mdns_supported_network(unsigned netid);
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// Return true if the cache is existent in the given network, false otherwise.
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bool has_named_cache(unsigned netid);
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// For test only.
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// Get the expiration time of a cache entry. Return 0 on success; otherwise, an negative error is
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// returned if the expiration time can't be acquired.
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int resolv_cache_get_expiration(unsigned netid, std::span<const uint8_t> query, time_t* expiration);
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// Set addresses to DnsStats for a given network.
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int resolv_stats_set_addrs(unsigned netid, android::net::Protocol proto,
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const std::vector<std::string>& addrs, int port);
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// Add a statistics record to DnsStats for a given network.
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bool resolv_stats_add(unsigned netid, const android::netdutils::IPSockAddr& server,
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const android::net::DnsQueryEvent* record);
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/* Retrieve a local copy of the stats for the given netid. The buffer must have space for
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* MAXNS __resolver_stats. Returns the revision id of the resolvers used.
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*/
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int resolv_cache_get_resolver_stats(
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unsigned netid, res_params* params, res_stats stats[MAXNS],
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const std::vector<android::netdutils::IPSockAddr>& serverSockAddrs);
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/* Add a sample to the shared struct for the given netid and server, provided that the
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* revision_id of the stored servers has not changed.
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*/
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void resolv_cache_add_resolver_stats_sample(unsigned netid, int revision_id,
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const android::netdutils::IPSockAddr& serverSockAddr,
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const res_sample& sample, int max_samples);
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// Convert TRANSPORT_* to NT_*. It's public only for unit testing.
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android::net::NetworkType convert_network_type(const std::vector<int32_t>& transportTypes);
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// Dump net configuration log for a given network.
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void resolv_netconfig_dump(android::netdutils::DumpWriter& dw, unsigned netid);
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