Skip to content
Fetching contributors…
Cannot retrieve contributors at this time
226 lines (194 sloc) 7.8 KB
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
* Copyright (C) 1998 - 2010, 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 <setjmp.h>
#ifdef NETWARE
#undef in_addr_t
#define in_addr_t unsigned long
* Comfortable CURLRES_* definitions are included from setup.h
#ifdef USE_ARES
#include <ares_version.h>
/* 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 */
#if ARES_VERSION >= 0x010500
/* c-ares 1.5.0 or later, the callback proto is modified */
#define ares_cancel(x) do {} while(0)
#define ares_destroy(x) do {} while(0)
struct addrinfo;
struct hostent;
struct SessionHandle;
struct connectdata;
void Curl_async_cancel(struct connectdata *conn);
#define Curl_async_cancel(x) do {} while(0)
* 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_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);
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_resolv_getsock() 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 multi_getsock() function. 'sock' is a pointer
to an array to hold the file descriptors, with 'numsock' being the size of
that array (in number of entries). This function is supposed to return
bitmask indicating what file descriptors (referring to array indexes in the
'sock' array) to wait for, read/write. */
int Curl_resolv_getsock(struct connectdata *conn, curl_socket_t *sock,
int numsocks);
/* 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);
* 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 wether successfull 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);
* Curl_destroy_thread_data() cleans up async resolver data.
* Complementary of ares_destroy.
struct Curl_async; /* forward-declaration */
void Curl_destroy_thread_data(struct Curl_async *async);
#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;
Jump to Line
Something went wrong with that request. Please try again.