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2b3dfb4ad4
- allow to specify when they are wanted on starting a resolve - match dns cache entries accordingly. An entry which never tried to get HTTPS-RRs is no answer for a resolve that wants it. - fix late arrivals of resolve answers to match the "async" records that started them - if it still exists. - provide for multiple "async" resolves in a transfer at the same time. We may need to resolve an IP interface while the main connection resolve has not finished yet. - allow lookup of HTTPS-RR information as soon as it is available, even if A/AAAA queries are still ongoing. For this, the "async" infrastructure is changed: - Defined bits for DNS queries `CURL_DNSQ_A`, `CURL_DNSQ_AAAA` and `CURL_DNSQ_HTTPS`. These replace `ip_version` which says nothing about HTTPS. Use them in dns cache entries for matching. - enhance the `async->id` to be a unique `uint32_t` for resolves inside one multi. This is weak, as the id may wrap around. However it is combined with the `mid` of the easy handle, making collisions highly unlikely. `data->state.async` is only accessed in few places where the mid/async-id match is performed. - vtls: for ECH supporting TLS backends (openssl, rustls, wolfssl), retrieve the HTTPS-RR information from the dns connection filter. Delay the connect if the HTTPS-RR is needed, but has not been resolved yet. The implementation of all this is complete for the threaded resolver. c-ares resolver and DoH do not take advantage of all new async features yet. To be done in separate PRs. Details: c-ares: cleanup settings and initialisation. Any ares channel is only being created on starting a resolve and propagating operations in setopt.c to the channel are not helpful. Changed threaded+ares pollset handling so that they do not overwrite each others `ASYNC_NAME` timeouts. Add trace name 'threads' for tracing thread queue and pool used by threaded resolver. Closes #21175
147 lines
5.0 KiB
C
147 lines
5.0 KiB
C
#ifndef HEADER_CURL_DNSCACHE_H
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#define HEADER_CURL_DNSCACHE_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#include "hash.h"
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#include "curlx/timeval.h"
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struct addrinfo;
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struct hostent;
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struct Curl_easy;
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struct connectdata;
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struct easy_pollset;
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struct Curl_https_rrinfo;
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struct Curl_multi;
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struct Curl_dns_entry {
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struct Curl_addrinfo *addr;
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#ifdef USE_HTTPSRR
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struct Curl_https_rrinfo *hinfo;
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#endif
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/* timestamp == 0 -- permanent CURLOPT_RESOLVE entry (does not time out) */
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struct curltime timestamp;
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/* reference counter, entry is freed on reaching 0 */
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uint32_t refcount;
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/* hostname port number that resolved to addr. */
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uint16_t port;
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uint8_t dns_queries; /* CURL_DNSQ_* type of queries performed for this */
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uint8_t dns_responses; /* CURL_DNSQ_* type this entry has responses for */
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/* hostname that resolved to addr. may be NULL (Unix domain sockets). */
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char hostname[1];
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};
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/*
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* Create a `Curl_dns_entry` with a reference count of 1.
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* Use `Curl_dns_entry_unlink()` to release your hold on it.
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*
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* The call takes ownership of `addr`, even in case of failure, and always
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* clears `*paddr`. It makes a copy of `hostname`.
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*
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* Returns entry or NULL on OOM.
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*/
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struct Curl_dns_entry *
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Curl_dnscache_mk_entry(struct Curl_easy *data,
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uint8_t dns_queries,
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struct Curl_addrinfo **paddr,
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const char *hostname,
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uint16_t port);
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struct Curl_dns_entry *
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Curl_dnscache_mk_entry2(struct Curl_easy *data,
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uint8_t dns_queries,
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struct Curl_addrinfo **paddr1,
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struct Curl_addrinfo **paddr2,
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const char *hostname,
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uint16_t port);
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#ifdef USE_HTTPSRR
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void Curl_dns_entry_set_https_rr(struct Curl_dns_entry *dns,
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struct Curl_https_rrinfo *hinfo);
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#endif /* USE_HTTPSRR */
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/* Increase the ref counter and return it for storing in another place.
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* May be called with NULL, in which case it returns NULL. */
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struct Curl_dns_entry *Curl_dns_entry_link(struct Curl_easy *data,
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struct Curl_dns_entry *dns);
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/* unlink a dns entry, frees all resources if it was the last reference.
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* Always clears `*pdns`` */
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void Curl_dns_entry_unlink(struct Curl_easy *data,
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struct Curl_dns_entry **pdns);
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struct Curl_dnscache {
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struct Curl_hash entries;
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};
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/* init a new dns cache */
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void Curl_dnscache_init(struct Curl_dnscache *dns, size_t hashsize);
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void Curl_dnscache_destroy(struct Curl_dnscache *dns);
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/* prune old entries from the DNS cache */
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void Curl_dnscache_prune(struct Curl_easy *data);
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/* clear the DNS cache */
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void Curl_dnscache_clear(struct Curl_easy *data);
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/*
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* Curl_dnscache_get() fetches a 'Curl_dns_entry' already in the DNS cache.
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*
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* Returns the Curl_dns_entry entry pointer or NULL if not in the cache.
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*
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* The returned data *MUST* be "released" with Curl_dns_entry_unlink() after
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* use, or we will leak memory!
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* Returns CURLE_OK or CURLE_COULDNT_RESOLVE_HOST when a negative
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* entry was in the cache.
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*/
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CURLcode Curl_dnscache_get(struct Curl_easy *data,
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uint8_t dns_queries,
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const char *hostname,
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uint16_t port,
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struct Curl_dns_entry **pentry);
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/*
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* Curl_dnscache_addr() adds `entry` to the cache, increasing its
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* reference count on success.
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*/
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CURLcode Curl_dnscache_add(struct Curl_easy *data,
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struct Curl_dns_entry *entry);
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/* Store a "negative" entry for host:port, e.g. remember that
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* it could not be resolved. */
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CURLcode Curl_dnscache_add_negative(struct Curl_easy *data,
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uint8_t dns_queries,
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const char *host,
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uint16_t port);
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/*
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* Populate the cache with specified entries from CURLOPT_RESOLVE.
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*/
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CURLcode Curl_loadhostpairs(struct Curl_easy *data);
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#endif /* HEADER_CURL_DNSCACHE_H */
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