220 lines
7.0 KiB
C
220 lines
7.0 KiB
C
#ifndef HEADER_CURL_HOSTIP_H
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#define HEADER_CURL_HOSTIP_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 "curl_addrinfo.h"
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#include "curlx/timeval.h" /* for timediff_t */
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#include "asyn.h"
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#include "httpsrr.h"
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#include <setjmp.h>
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#ifdef USE_HTTPSRR
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# include <stdint.h>
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#endif
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/* Allocate enough memory to hold the full name information structs and
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* everything. OSF1 is known to require at least 8872 bytes. The buffer
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* required for storing all possible aliases and IP numbers is according to
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* Stevens' Unix Network Programming 2nd edition, p. 304: 8192 bytes!
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*/
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#define CURL_HOSTENT_SIZE 9000
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#define CURL_TIMEOUT_RESOLVE 300 /* when using asynch methods, we allow this
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many seconds for a name resolve */
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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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enum alpnid {
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ALPN_none = 0,
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ALPN_h1 = CURLALTSVC_H1,
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ALPN_h2 = CURLALTSVC_H2,
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ALPN_h3 = CURLALTSVC_H3
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};
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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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size_t refcount;
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/* hostname port number that resolved to addr. */
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int hostport;
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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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struct Curl_dnscache {
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struct Curl_hash entries;
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};
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bool Curl_host_is_ipnum(const char *hostname);
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/*
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* Curl_resolv() returns an entry with the info for the specified host
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* and port.
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*
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* The returned data *MUST* be "released" with Curl_resolv_unlink() after
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* use, or we will leak memory!
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*/
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CURLcode Curl_resolv(struct Curl_easy *data,
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const char *hostname,
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int port,
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int ip_version,
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bool allowDOH,
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struct Curl_dns_entry **dnsentry);
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CURLcode Curl_resolv_blocking(struct Curl_easy *data,
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const char *hostname,
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int port,
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int ip_version,
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struct Curl_dns_entry **dnsentry);
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CURLcode Curl_resolv_timeout(struct Curl_easy *data,
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const char *hostname, int port,
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int ip_version,
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struct Curl_dns_entry **dnsentry,
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timediff_t timeoutms);
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#ifdef USE_IPV6
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/*
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* Curl_ipv6works() returns TRUE if IPv6 seems to work.
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*/
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bool Curl_ipv6works(struct Curl_easy *data);
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#else
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#define Curl_ipv6works(x) FALSE
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#endif
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/* unlink a dns entry, potentially shared with a cache */
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void Curl_resolv_unlink(struct Curl_easy *data,
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struct Curl_dns_entry **pdns);
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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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/* IPv4 threadsafe resolve function used for synch and asynch builds */
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struct Curl_addrinfo *Curl_ipv4_resolve_r(const char *hostname, int port);
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CURLcode Curl_once_resolved(struct Curl_easy *data,
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struct Curl_dns_entry *dns,
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bool *protocol_connect);
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/*
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* Curl_printable_address() returns a printable version of the 1st address
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* given in the 'ip' argument. The result will be stored in the buf that is
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* bufsize bytes big.
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*/
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void Curl_printable_address(const struct Curl_addrinfo *ip,
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char *buf, size_t bufsize);
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/*
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* Make a `Curl_dns_entry`.
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* Creates a dnscache entry *without* adding it to a dnscache. This allows
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* further modifications of the entry *before* then adding it to a cache.
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*
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* The entry is created with a reference count of 1.
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* Use `Curl_resolv_unlink()` to release your hold on it.
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*
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* The call takes ownership of `addr`and 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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struct Curl_addrinfo *addr,
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const char *hostname,
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size_t hostlen, /* length or zero */
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int port,
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bool permanent);
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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_resolv_unlink() after
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* use, or we will leak memory!
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*/
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struct Curl_dns_entry *
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Curl_dnscache_get(struct Curl_easy *data,
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const char *hostname,
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int port, int ip_version);
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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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/*
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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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#ifdef USE_CURL_ASYNC
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CURLcode Curl_resolv_check(struct Curl_easy *data,
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struct Curl_dns_entry **dns);
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#else
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#define Curl_resolv_check(x,y) CURLE_NOT_BUILT_IN
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#endif
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CURLcode Curl_resolv_pollset(struct Curl_easy *data,
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struct easy_pollset *ps);
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CURLcode Curl_resolver_error(struct Curl_easy *data, const char *detail);
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#ifdef CURLRES_SYNCH
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/*
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* Curl_sync_getaddrinfo() is the non-async low-level name resolve API.
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* There are several versions of this function - depending on IPV6
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* support and platform.
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*/
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struct Curl_addrinfo *Curl_sync_getaddrinfo(struct Curl_easy *data,
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const char *hostname,
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int port,
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int ip_version);
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#endif
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#endif /* HEADER_CURL_HOSTIP_H */
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