| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include "netd_resolv/resolv.h" |
| |
| #include <stddef.h> |
| |
| #include <unordered_map> |
| #include <vector> |
| |
| struct __res_state; |
| struct resolv_cache; |
| |
| constexpr int DNSEVENT_SUBSAMPLING_MAP_DEFAULT_KEY = -1; |
| |
| /* sets the name server addresses to the provided res_state structure. The |
| * name servers are retrieved from the cache which is associated |
| * with the network to which the res_state structure is associated */ |
| void _resolv_populate_res_for_net(struct __res_state* statp); |
| |
| std::vector<unsigned> resolv_list_caches(); |
| |
| std::vector<std::string> resolv_cache_dump_subsampling_map(unsigned netid); |
| uint32_t resolv_cache_get_subsampling_denom(unsigned netid, int return_code); |
| |
| typedef enum { |
| RESOLV_CACHE_UNSUPPORTED, /* the cache can't handle that kind of queries */ |
| /* or the answer buffer is too small */ |
| RESOLV_CACHE_NOTFOUND, /* the cache doesn't know about this query */ |
| RESOLV_CACHE_FOUND, /* the cache found the answer */ |
| RESOLV_CACHE_SKIP /* Don't do anything on cache */ |
| } ResolvCacheStatus; |
| |
| ResolvCacheStatus resolv_cache_lookup(unsigned netid, const void* query, int querylen, void* answer, |
| int answersize, int* answerlen, uint32_t flags); |
| |
| // add a (query,answer) to the cache. If the pair has been in the cache, no new entry will be added |
| // in the cache. |
| int resolv_cache_add(unsigned netid, const void* query, int querylen, const void* answer, |
| int answerlen); |
| |
| /* Notify the cache a request failed */ |
| void _resolv_cache_query_failed(unsigned netid, const void* query, int querylen, uint32_t flags); |
| |
| // Sets name servers for a given network. |
| int resolv_set_nameservers(unsigned netid, const std::vector<std::string>& servers, |
| const std::vector<std::string>& domains, const res_params& params); |
| |
| // Creates the cache associated with the given network. |
| int resolv_create_cache_for_net(unsigned netid); |
| |
| // Deletes the cache associated with the given network. |
| void resolv_delete_cache_for_net(unsigned netid); |
| |
| // For test only. |
| // Return true if the cache is existent in the given network, false otherwise. |
| bool has_named_cache(unsigned netid); |
| |
| // For test only. |
| // Get the expiration time of a cache entry. Return 0 on success; otherwise, an negative error is |
| // returned if the expiration time can't be acquired. |
| int resolv_cache_get_expiration(unsigned netid, const std::vector<char>& query, time_t* expiration); |