226 lines
7.5 KiB
C
226 lines
7.5 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 "timeval.h" /* for timediff_t */
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#include "asyn.h"
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#include <setjmp.h>
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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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#define CURL_ASYNC_SUCCESS CURLE_OK
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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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/*
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* Curl_global_host_cache_init() initializes and sets up a global DNS cache.
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* Global DNS cache is general badness. Do not use. This will be removed in
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* a future version. Use the share interface instead!
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*
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* Returns a struct Curl_hash pointer on success, NULL on failure.
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*/
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struct Curl_hash *Curl_global_host_cache_init(void);
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struct Curl_dns_entry {
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struct Curl_addrinfo *addr;
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/* timestamp == 0 -- permanent CURLOPT_RESOLVE entry (doesn't time out) */
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time_t timestamp;
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/* use-counter, use Curl_resolv_unlock to release reference */
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long inuse;
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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 "unlocked" with Curl_resolv_unlock() after
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* use, or we'll leak memory!
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*/
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/* return codes */
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enum resolve_t {
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CURLRESOLV_TIMEDOUT = -2,
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CURLRESOLV_ERROR = -1,
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CURLRESOLV_RESOLVED = 0,
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CURLRESOLV_PENDING = 1
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};
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enum resolve_t Curl_resolv(struct Curl_easy *data,
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const char *hostname,
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int port,
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bool allowDOH,
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struct Curl_dns_entry **dnsentry);
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enum resolve_t Curl_resolv_timeout(struct Curl_easy *data,
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const char *hostname, int port,
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struct Curl_dns_entry **dnsentry,
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timediff_t timeoutms);
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#ifdef ENABLE_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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/*
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* Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
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* been set and returns TRUE if they are OK.
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*/
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bool Curl_ipvalid(struct Curl_easy *data, struct connectdata *conn);
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/*
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* Curl_getaddrinfo() is the generic low-level name resolve API within this
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* source file. There are several versions of this function - for different
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* name resolve layers (selected at build-time). They all take this same set
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* of arguments
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*/
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struct Curl_addrinfo *Curl_getaddrinfo(struct Curl_easy *data,
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const char *hostname,
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int port,
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int *waitp);
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/* unlock a previously resolved dns entry */
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void Curl_resolv_unlock(struct Curl_easy *data,
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struct Curl_dns_entry *dns);
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/* init a new dns cache */
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void Curl_init_dnscache(struct Curl_hash *hash, int hashsize);
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/* prune old entries from the DNS cache */
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void Curl_hostcache_prune(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, bool *protocol_connect);
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/*
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* Curl_addrinfo_callback() is used when we build with any asynch specialty.
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* Handles end of async request processing. Inserts ai into hostcache when
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* status is CURL_ASYNC_SUCCESS. Twiddles fields in conn to indicate async
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* request completed whether successful or failed.
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*/
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CURLcode Curl_addrinfo_callback(struct Curl_easy *data,
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int status,
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struct Curl_addrinfo *ai);
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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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* Curl_fetch_addr() 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 "unlocked" with Curl_resolv_unlock() after
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* use, or we'll leak memory!
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*/
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struct Curl_dns_entry *
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Curl_fetch_addr(struct Curl_easy *data,
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const char *hostname,
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int port);
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/*
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* Curl_cache_addr() stores a 'Curl_addrinfo' struct in the DNS cache.
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*
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* Returns the Curl_dns_entry entry pointer or NULL if the storage failed.
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*/
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struct Curl_dns_entry *
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Curl_cache_addr(struct Curl_easy *data, struct Curl_addrinfo *addr,
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const char *hostname, size_t hostlen, int port);
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#ifndef INADDR_NONE
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#define CURL_INADDR_NONE (in_addr_t) ~0
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#else
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#define CURL_INADDR_NONE INADDR_NONE
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#endif
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/*
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* Function provided by the resolver backend to set DNS servers to use.
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*/
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CURLcode Curl_set_dns_servers(struct Curl_easy *data, char *servers);
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/*
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* Function provided by the resolver backend to set
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* outgoing interface to use for DNS requests
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*/
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CURLcode Curl_set_dns_interface(struct Curl_easy *data,
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const char *interf);
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/*
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* Function provided by the resolver backend to set
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* local IPv4 address to use as source address for DNS requests
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*/
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CURLcode Curl_set_dns_local_ip4(struct Curl_easy *data,
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const char *local_ip4);
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/*
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* Function provided by the resolver backend to set
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* local IPv6 address to use as source address for DNS requests
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*/
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CURLcode Curl_set_dns_local_ip6(struct Curl_easy *data,
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const char *local_ip6);
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/*
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* Clean off entries from the cache
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*/
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void Curl_hostcache_clean(struct Curl_easy *data, struct Curl_hash *hash);
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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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CURLcode Curl_resolv_check(struct Curl_easy *data,
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struct Curl_dns_entry **dns);
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int Curl_resolv_getsock(struct Curl_easy *data,
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curl_socket_t *socks);
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CURLcode Curl_resolver_error(struct Curl_easy *data);
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#endif /* HEADER_CURL_HOSTIP_H */
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