mirror of
https://github.com/curl/curl.git
synced 2024-11-27 05:50:21 +08:00
a55faf33d4
It was used (intended) to pass in the size of the 'socks' array that is also passed to these functions, but was rarely actually checked/used and the array is defined to a fixed size of MAX_SOCKSPEREASYHANDLE entries that should be used instead. Closes #4169
184 lines
6.6 KiB
C
184 lines
6.6 KiB
C
#ifndef HEADER_CURL_ASYN_H
|
|
#define HEADER_CURL_ASYN_H
|
|
/***************************************************************************
|
|
* _ _ ____ _
|
|
* Project ___| | | | _ \| |
|
|
* / __| | | | |_) | |
|
|
* | (__| |_| | _ <| |___
|
|
* \___|\___/|_| \_\_____|
|
|
*
|
|
* Copyright (C) 1998 - 2019, 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 "curl_addrinfo.h"
|
|
|
|
struct addrinfo;
|
|
struct hostent;
|
|
struct Curl_easy;
|
|
struct connectdata;
|
|
struct Curl_dns_entry;
|
|
|
|
/*
|
|
* This header defines all functions in the internal asynch resolver interface.
|
|
* All asynch resolvers need to provide these functions.
|
|
* asyn-ares.c and asyn-thread.c are the current implementations of asynch
|
|
* resolver backends.
|
|
*/
|
|
|
|
/*
|
|
* Curl_resolver_global_init()
|
|
*
|
|
* Called from curl_global_init() to initialize global resolver environment.
|
|
* Returning anything else than CURLE_OK fails curl_global_init().
|
|
*/
|
|
int Curl_resolver_global_init(void);
|
|
|
|
/*
|
|
* Curl_resolver_global_cleanup()
|
|
* Called from curl_global_cleanup() to destroy global resolver environment.
|
|
*/
|
|
void Curl_resolver_global_cleanup(void);
|
|
|
|
/*
|
|
* Curl_resolver_init()
|
|
* Called from curl_easy_init() -> Curl_open() to initialize resolver
|
|
* URL-state specific environment ('resolver' member of the UrlState
|
|
* structure). Should fill the passed pointer by the initialized handler.
|
|
* Returning anything else than CURLE_OK fails curl_easy_init() with the
|
|
* correspondent code.
|
|
*/
|
|
CURLcode Curl_resolver_init(struct Curl_easy *easy, void **resolver);
|
|
|
|
/*
|
|
* Curl_resolver_cleanup()
|
|
* Called from curl_easy_cleanup() -> Curl_close() to cleanup resolver
|
|
* URL-state specific environment ('resolver' member of the UrlState
|
|
* structure). Should destroy the handler and free all resources connected to
|
|
* it.
|
|
*/
|
|
void Curl_resolver_cleanup(void *resolver);
|
|
|
|
/*
|
|
* Curl_resolver_duphandle()
|
|
* Called from curl_easy_duphandle() to duplicate resolver URL-state specific
|
|
* environment ('resolver' member of the UrlState structure). Should
|
|
* duplicate the 'from' handle and pass the resulting handle to the 'to'
|
|
* pointer. Returning anything else than CURLE_OK causes failed
|
|
* curl_easy_duphandle() call.
|
|
*/
|
|
CURLcode Curl_resolver_duphandle(struct Curl_easy *easy, void **to,
|
|
void *from);
|
|
|
|
/*
|
|
* Curl_resolver_cancel().
|
|
*
|
|
* It is called from inside other functions to cancel currently performing
|
|
* resolver request. Should also free any temporary resources allocated to
|
|
* perform a request. This never waits for resolver threads to complete.
|
|
*
|
|
* It is safe to call this when conn is in any state.
|
|
*/
|
|
void Curl_resolver_cancel(struct connectdata *conn);
|
|
|
|
/*
|
|
* Curl_resolver_kill().
|
|
*
|
|
* This acts like Curl_resolver_cancel() except it will block until any threads
|
|
* associated with the resolver are complete. This never blocks for resolvers
|
|
* that do not use threads. This is intended to be the "last chance" function
|
|
* that cleans up an in-progress resolver completely (before its owner is about
|
|
* to die).
|
|
*
|
|
* It is safe to call this when conn is in any state.
|
|
*/
|
|
void Curl_resolver_kill(struct connectdata *conn);
|
|
|
|
/* Curl_resolver_getsock()
|
|
*
|
|
* This 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_resolver_getsock(struct connectdata *conn, curl_socket_t *sock);
|
|
|
|
/*
|
|
* Curl_resolver_is_resolved()
|
|
*
|
|
* Called repeatedly to check if a previous name resolve request has
|
|
* completed. It should also make sure to time-out if the operation seems to
|
|
* take too long.
|
|
*
|
|
* Returns normal CURLcode errors.
|
|
*/
|
|
CURLcode Curl_resolver_is_resolved(struct connectdata *conn,
|
|
struct Curl_dns_entry **dns);
|
|
|
|
/*
|
|
* Curl_resolver_wait_resolv()
|
|
*
|
|
* Waits for a resolve to finish. This function should be avoided since using
|
|
* this risk getting the multi interface to "hang".
|
|
*
|
|
* If 'entry' is non-NULL, make it point to the resolved dns entry
|
|
*
|
|
* Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved,
|
|
* CURLE_OPERATION_TIMEDOUT if a time-out occurred, or other errors.
|
|
*/
|
|
CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
|
|
struct Curl_dns_entry **dnsentry);
|
|
|
|
/*
|
|
* Curl_resolver_getaddrinfo() - when using this resolver
|
|
*
|
|
* Returns name information about the given hostname and port number. If
|
|
* successful, the 'hostent' is returned and the forth argument will point to
|
|
* memory we need to free after use. That memory *MUST* be freed with
|
|
* Curl_freeaddrinfo(), nothing else.
|
|
*
|
|
* Each resolver backend must of course make sure to return data in the
|
|
* correct format to comply with this.
|
|
*/
|
|
Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
|
|
const char *hostname,
|
|
int port,
|
|
int *waitp);
|
|
|
|
#ifndef CURLRES_ASYNCH
|
|
/* convert these functions if an asynch resolver isn't used */
|
|
#define Curl_resolver_cancel(x) Curl_nop_stmt
|
|
#define Curl_resolver_kill(x) Curl_nop_stmt
|
|
#define Curl_resolver_is_resolved(x,y) CURLE_COULDNT_RESOLVE_HOST
|
|
#define Curl_resolver_wait_resolv(x,y) CURLE_COULDNT_RESOLVE_HOST
|
|
#define Curl_resolver_getsock(x,y,z) 0
|
|
#define Curl_resolver_duphandle(x,y,z) CURLE_OK
|
|
#define Curl_resolver_init(x,y) CURLE_OK
|
|
#define Curl_resolver_global_init() CURLE_OK
|
|
#define Curl_resolver_global_cleanup() Curl_nop_stmt
|
|
#define Curl_resolver_cleanup(x) Curl_nop_stmt
|
|
#endif
|
|
|
|
#ifdef CURLRES_ASYNCH
|
|
#define Curl_resolver_asynch() 1
|
|
#else
|
|
#define Curl_resolver_asynch() 0
|
|
#endif
|
|
|
|
|
|
/********** end of generic resolver interface functions *****************/
|
|
#endif /* HEADER_CURL_ASYN_H */
|