Skip to content


Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tag: curl-7_26_0
Fetching contributors…

Cannot retrieve contributors at this time

211 lines (177 sloc) 7.075 kb
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
* Copyright (C) 1998 - 2011, Daniel Stenberg, <>, 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
* 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 "setup.h"
#include "hash.h"
#include "curl_addrinfo.h"
#include "asyn.h"
#include <setjmp.h>
#ifdef NETWARE
#undef in_addr_t
#define in_addr_t unsigned long
/* 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 */
struct addrinfo;
struct hostent;
struct SessionHandle;
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 -- entry not in hostcache
timestamp != 0 -- entry is in hostcache */
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!
/* return codes */
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);
* Curl_ipv6works() returns TRUE if ipv6 seems to work.
bool Curl_ipv6works(void);
#define Curl_ipv6works() FALSE
* 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 SessionHandle *data,
struct Curl_dns_entry *dns);
/* for debugging purposes only: */
void Curl_scan_cache_used(void *user, void *ptr);
/* make a new dns cache and return the handle */
struct curl_hash *Curl_mk_dnscache(void);
/* prune old entries from the DNS cache */
void Curl_hostcache_prune(struct SessionHandle *data);
/* Return # of adresses in a Curl_addrinfo struct */
int Curl_num_addresses (const Curl_addrinfo *addr);
#if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
int line, const char *source);
/* 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);
#define Curl_async_resolved(x,y) CURLE_OK
* 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_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,
const char *hostname, int port);
#define CURL_INADDR_NONE (in_addr_t) ~0
/* 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;
* Function provided by the resolver backend to set DNS servers to use.
CURLcode Curl_set_dns_servers(struct SessionHandle *data, char *servers);
* Destroy the hostcache of this handle.
void Curl_hostcache_destroy(struct SessionHandle *data);
CURLcode Curl_loadhostpairs(struct SessionHandle *data);
Jump to Line
Something went wrong with that request. Please try again.