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curl/lib/hostip.h

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#ifndef HEADER_CURL_HOSTIP_H
#define HEADER_CURL_HOSTIP_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#include "hash.h"
#include "curl_addrinfo.h"
#include "asyn.h"
#ifdef HAVE_SETJMP_H
#include <setjmp.h>
#endif
#ifdef NETWARE
#undef in_addr_t
#define in_addr_t unsigned long
#endif
/* Allocate enough memory to hold the full name information structs and
* everything. OSF1 is known to require at least 8872 bytes. The buffer
* required for storing all possible aliases and IP numbers is according to
* Stevens' Unix Network Programming 2nd edition, p. 304: 8192 bytes!
*/
#define CURL_HOSTENT_SIZE 9000
#define CURL_TIMEOUT_RESOLVE 300 /* when using asynch methods, we allow this
many seconds for a name resolve */
#define CURL_ASYNC_SUCCESS CURLE_OK
struct addrinfo;
struct hostent;
struct Curl_easy;
struct connectdata;
/*
* Curl_global_host_cache_init() initializes and sets up a global DNS cache.
* Global DNS cache is general badness. Do not use. This will be removed in
* a future version. Use the share interface instead!
*
* Returns a struct curl_hash pointer on success, NULL on failure.
*/
struct curl_hash *Curl_global_host_cache_init(void);
void Curl_global_host_cache_dtor(void);
struct Curl_dns_entry {
Curl_addrinfo *addr;
/* timestamp == 0 -- CURLOPT_RESOLVE entry, doesn't timeout */
time_t timestamp;
/* use-counter, use Curl_resolv_unlock to release reference */
long inuse;
};
/*
* Curl_resolv() returns an entry with the info for the specified host
* and port.
*
* The returned data *MUST* be "unlocked" with Curl_resolv_unlock() after
* use, or we'll leak memory!
*/
/* return codes */
#define CURLRESOLV_TIMEDOUT -2
#define CURLRESOLV_ERROR -1
#define CURLRESOLV_RESOLVED 0
#define CURLRESOLV_PENDING 1
int Curl_resolv(struct connectdata *conn, const char *hostname,
int port, struct Curl_dns_entry **dnsentry);
int Curl_resolv_timeout(struct connectdata *conn, const char *hostname,
int port, struct Curl_dns_entry **dnsentry,
long timeoutms);
#ifdef CURLRES_IPV6
/*
* Curl_ipv6works() returns TRUE if IPv6 seems to work.
*/
bool Curl_ipv6works(void);
#else
#define Curl_ipv6works() FALSE
#endif
/*
* Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
* been set and returns TRUE if they are OK.
*/
bool Curl_ipvalid(struct connectdata *conn);
/*
* Curl_getaddrinfo() is the generic low-level name resolve API within this
* source file. There are several versions of this function - for different
* name resolve layers (selected at build-time). They all take this same set
* of arguments
*/
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname,
int port,
int *waitp);
/* unlock a previously resolved dns entry */
void Curl_resolv_unlock(struct Curl_easy *data,
struct Curl_dns_entry *dns);
/* for debugging purposes only: */
void Curl_scan_cache_used(void *user, void *ptr);
/* init a new dns cache and return success */
int Curl_mk_dnscache(struct curl_hash *hash);
/* prune old entries from the DNS cache */
void Curl_hostcache_prune(struct Curl_easy *data);
/* Return # of adresses in a Curl_addrinfo struct */
int Curl_num_addresses (const Curl_addrinfo *addr);
#if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
GETNAMEINFO_TYPE_ARG2 salen,
char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
GETNAMEINFO_TYPE_ARG7 flags,
int line, const char *source);
#endif
/* IPv4 threadsafe resolve function used for synch and asynch builds */
Curl_addrinfo *Curl_ipv4_resolve_r(const char * hostname, int port);
CURLcode Curl_async_resolved(struct connectdata *conn,
bool *protocol_connect);
#ifndef CURLRES_ASYNCH
#define Curl_async_resolved(x,y) CURLE_OK
#endif
/*
* Curl_addrinfo_callback() is used when we build with any asynch specialty.
* Handles end of async request processing. Inserts ai into hostcache when
* status is CURL_ASYNC_SUCCESS. Twiddles fields in conn to indicate async
* request completed whether successful or failed.
*/
CURLcode Curl_addrinfo_callback(struct connectdata *conn,
int status,
Curl_addrinfo *ai);
/*
* Curl_printable_address() returns a printable version of the 1st address
* given in the 'ip' argument. The result will be stored in the buf that is
* bufsize bytes big.
*/
const char *Curl_printable_address(const Curl_addrinfo *ip,
char *buf, size_t bufsize);
/*
* Curl_fetch_addr() fetches a 'Curl_dns_entry' already in the DNS cache.
*
* Returns the Curl_dns_entry entry pointer or NULL if not in the cache.
*
* The returned data *MUST* be "unlocked" with Curl_resolv_unlock() after
* use, or we'll leak memory!
*/
struct Curl_dns_entry *
Curl_fetch_addr(struct connectdata *conn,
const char *hostname,
int port);
/*
* Curl_cache_addr() stores a 'Curl_addrinfo' struct in the DNS cache.
*
* Returns the Curl_dns_entry entry pointer or NULL if the storage failed.
*/
struct Curl_dns_entry *
Curl_cache_addr(struct Curl_easy *data, Curl_addrinfo *addr,
const char *hostname, int port);
#ifndef INADDR_NONE
#define CURL_INADDR_NONE (in_addr_t) ~0
#else
#define CURL_INADDR_NONE INADDR_NONE
#endif
#ifdef HAVE_SIGSETJMP
/* Forward-declaration of variable defined in hostip.c. Beware this
* is a global and unique instance. This is used to store the return
* address that we can jump back to from inside a signal handler.
* This is not thread-safe stuff.
*/
extern sigjmp_buf curl_jmpenv;
#endif
/*
* Function provided by the resolver backend to set DNS servers to use.
*/
CURLcode Curl_set_dns_servers(struct Curl_easy *data, char *servers);
/*
* Function provided by the resolver backend to set
* outgoing interface to use for DNS requests
*/
CURLcode Curl_set_dns_interface(struct Curl_easy *data,
const char *interf);
/*
* Function provided by the resolver backend to set
* local IPv4 address to use as source address for DNS requests
*/
CURLcode Curl_set_dns_local_ip4(struct Curl_easy *data,
const char *local_ip4);
/*
* Function provided by the resolver backend to set
* local IPv6 address to use as source address for DNS requests
*/
CURLcode Curl_set_dns_local_ip6(struct Curl_easy *data,
const char *local_ip6);
/*
* Clean off entries from the cache
*/
void Curl_hostcache_clean(struct Curl_easy *data, struct curl_hash *hash);
/*
* Destroy the hostcache of this handle.
*/
void Curl_hostcache_destroy(struct Curl_easy *data);
/*
* Populate the cache with specified entries from CURLOPT_RESOLVE.
*/
CURLcode Curl_loadhostpairs(struct Curl_easy *data);
#endif /* HEADER_CURL_HOSTIP_H */
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