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#ifndef __HOSTIP_H
#define __HOSTIP_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2004, 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 http://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.
*
* $Id$
***************************************************************************/
#include "setup.h"
#include "hash.h"
struct addrinfo;
struct hostent;
struct SessionHandle;
struct connectdata;
void Curl_global_host_cache_init(void);
void Curl_global_host_cache_dtor(void);
curl_hash *Curl_global_host_cache_get(void);
#define Curl_global_host_cache_use(__p) ((__p)->set.global_dns_cache)
struct Curl_dns_entry {
Curl_addrinfo *addr;
time_t timestamp;
long inuse; /* use-counter, make very sure you decrease this
when you're done using the address you received */
};
/*
* 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!
*/
int Curl_resolv(struct connectdata *conn,
char *hostname,
int port,
struct Curl_dns_entry **dnsentry);
/*
* Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
* been set and returns TRUE if they are OK.
*/
bool Curl_ipvalid(struct SessionHandle *data);
/*
* 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,
char *hostname,
int port,
int *waitp);
CURLcode Curl_is_resolved(struct connectdata *conn,
struct Curl_dns_entry **dns);
CURLcode Curl_wait_for_resolv(struct connectdata *conn,
struct Curl_dns_entry **dnsentry);
/* Curl_fdset() is a generic function that exists in multiple versions
depending on what name resolve technology we've built to use. The function
is called from the curl_multi_fdset() function */
CURLcode Curl_fdset(struct connectdata *conn,
fd_set *read_fd_set,
fd_set *write_fd_set,
int *max_fdp);
/* unlock a previously resolved dns entry */
void Curl_resolv_unlock(struct SessionHandle *data, struct Curl_dns_entry *dns);
/* for debugging purposes only: */
void Curl_scan_cache_used(void *user, void *ptr);
/* free name info */
void Curl_freeaddrinfo(Curl_addrinfo *freeaddr);
/* make a new dns cache and return the handle */
curl_hash *Curl_mk_dnscache(void);
/* prune old entries from the DNS cache */
void Curl_hostcache_prune(struct SessionHandle *data);
#ifdef CURLDEBUG
void curl_dofreeaddrinfo(struct addrinfo *freethis,
int line, const char *source);
int curl_dogetaddrinfo(char *hostname, char *service,
struct addrinfo *hints,
struct addrinfo **result,
int line, const char *source);
int curl_dogetnameinfo(const struct sockaddr *sa, socklen_t salen,
char *host, size_t hostlen,
char *serv, size_t servlen, int flags,
int line, const char *source);
#endif
/* This is the callback function that is used when we build with asynch
resolve */
void Curl_addrinfo_callback(void *arg,
int status,
Curl_addrinfo *hostent);
/* This is a utility-function for ipv4-builds to create a hostent struct
from a numerical-only IP address */
Curl_addrinfo *Curl_ip2addr(unsigned long num, char *hostname);
/* relocate a hostent struct */
void Curl_hostent_relocate(struct hostent *h, long offset);
/* copy a Curl_addrinfo struct, currently this only supports copying
a hostent (ipv4-style) struct */
Curl_addrinfo *Curl_addrinfo_copy(Curl_addrinfo *orig);
/*
* (IPv6) Curl_printable_address() returns a printable version of the
* ai->ai_addr address given in the 2nd argument. The first should be the
* ai->ai_family and the result will be stored in the buf that is bufsize
* bytes big.
*/
const char *Curl_printable_address(int af, void *addr,
char *buf, size_t bufsize);
/*
* 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 SessionHandle *data, Curl_addrinfo *addr,
char *hostname, int port);
#ifndef INADDR_NONE
#define CURL_INADDR_NONE (in_addr_t) ~0
#else
#define CURL_INADDR_NONE INADDR_NONE
#endif
/*
* Setup comfortable CURLRES_* defines to use in the host*.c sources.
*/
#ifdef USE_ARES
#define CURLRES_ASYNCH
#define CURLRES_ARES
#endif
#ifdef USE_THREADING_GETHOSTBYNAME
#define CURLRES_ASYNCH
#define CURLRES_THREADED
#endif
#ifdef USE_THREADING_GETADDRINFO
#define CURLRES_ASYNCH
#define CURLRES_THREADED
#endif
#ifdef ENABLE_IPV6
#define CURLRES_IPV6
#else
#define CURLRES_IPV4
#endif
#ifdef CURLRES_IPV4
#if !defined(HAVE_GETHOSTBYNAME_R) || defined(CURLRES_ASYNCH)
/* If built for ipv4 and missing gethostbyname_r(), or if using async name
resolve, we need the Curl_addrinfo_copy() function (which itself needs the
Curl_hostent_relocate() function)) */
#define CURLRES_ADDRINFO_COPY
#define CURLRES_HOSTENT_RELOCATE
#endif
#endif /* IPv4-only */
#ifdef HAVE_GETHOSTBYNAME_R_6
#define CURLRES_HOSTENT_RELOCATE
#endif
#ifdef HAVE_GETHOSTBYNAME_R_5
#define CURLRES_HOSTENT_RELOCATE
#endif
#ifndef CURLRES_ASYNCH
#define CURLRES_SYNCH
#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 */
#ifdef CURLRES_ARES
#define CURL_ASYNC_SUCCESS ARES_SUCCESS
#else
#define CURL_ASYNC_SUCCESS CURLE_OK
#endif
#endif
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