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184 lines
6.6 KiB
184 lines
6.6 KiB
#ifndef HEADER_CURL_ASYN_H
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#define HEADER_CURL_ASYN_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "curl_setup.h"
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#include "curl_addrinfo.h"
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struct addrinfo;
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struct hostent;
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struct Curl_easy;
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struct connectdata;
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struct Curl_dns_entry;
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/*
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* This header defines all functions in the internal asynch resolver interface.
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* All asynch resolvers need to provide these functions.
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* asyn-ares.c and asyn-thread.c are the current implementations of asynch
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* resolver backends.
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*/
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/*
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* Curl_resolver_global_init()
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*
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* Called from curl_global_init() to initialize global resolver environment.
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* Returning anything else than CURLE_OK fails curl_global_init().
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*/
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int Curl_resolver_global_init(void);
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/*
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* Curl_resolver_global_cleanup()
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* Called from curl_global_cleanup() to destroy global resolver environment.
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*/
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void Curl_resolver_global_cleanup(void);
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/*
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* Curl_resolver_init()
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* Called from curl_easy_init() -> Curl_open() to initialize resolver
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* URL-state specific environment ('resolver' member of the UrlState
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* structure). Should fill the passed pointer by the initialized handler.
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* Returning anything else than CURLE_OK fails curl_easy_init() with the
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* correspondent code.
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*/
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CURLcode Curl_resolver_init(struct Curl_easy *easy, void **resolver);
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/*
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* Curl_resolver_cleanup()
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* Called from curl_easy_cleanup() -> Curl_close() to cleanup resolver
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* URL-state specific environment ('resolver' member of the UrlState
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* structure). Should destroy the handler and free all resources connected to
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* it.
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*/
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void Curl_resolver_cleanup(void *resolver);
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/*
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* Curl_resolver_duphandle()
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* Called from curl_easy_duphandle() to duplicate resolver URL-state specific
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* environment ('resolver' member of the UrlState structure). Should
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* duplicate the 'from' handle and pass the resulting handle to the 'to'
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* pointer. Returning anything else than CURLE_OK causes failed
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* curl_easy_duphandle() call.
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*/
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CURLcode Curl_resolver_duphandle(struct Curl_easy *easy, void **to,
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void *from);
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/*
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* Curl_resolver_cancel().
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*
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* It is called from inside other functions to cancel currently performing
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* resolver request. Should also free any temporary resources allocated to
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* perform a request. This never waits for resolver threads to complete.
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*
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* It is safe to call this when conn is in any state.
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*/
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void Curl_resolver_cancel(struct connectdata *conn);
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/*
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* Curl_resolver_kill().
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*
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* This acts like Curl_resolver_cancel() except it will block until any threads
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* associated with the resolver are complete. This never blocks for resolvers
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* that do not use threads. This is intended to be the "last chance" function
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* that cleans up an in-progress resolver completely (before its owner is about
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* to die).
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*
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* It is safe to call this when conn is in any state.
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*/
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void Curl_resolver_kill(struct connectdata *conn);
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/* Curl_resolver_getsock()
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*
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* This function is called from the multi_getsock() function. 'sock' is a
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* pointer to an array to hold the file descriptors, with 'numsock' being the
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* size of that array (in number of entries). This function is supposed to
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* return bitmask indicating what file descriptors (referring to array indexes
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* in the 'sock' array) to wait for, read/write.
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*/
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int Curl_resolver_getsock(struct connectdata *conn, curl_socket_t *sock);
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/*
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* Curl_resolver_is_resolved()
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*
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* Called repeatedly to check if a previous name resolve request has
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* completed. It should also make sure to time-out if the operation seems to
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* take too long.
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*
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* Returns normal CURLcode errors.
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*/
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CURLcode Curl_resolver_is_resolved(struct connectdata *conn,
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struct Curl_dns_entry **dns);
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/*
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* Curl_resolver_wait_resolv()
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*
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* Waits for a resolve to finish. This function should be avoided since using
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* this risk getting the multi interface to "hang".
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*
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* If 'entry' is non-NULL, make it point to the resolved dns entry
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*
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* Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved,
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* CURLE_OPERATION_TIMEDOUT if a time-out occurred, or other errors.
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*/
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CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
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struct Curl_dns_entry **dnsentry);
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/*
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* Curl_resolver_getaddrinfo() - when using this resolver
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*
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* Returns name information about the given hostname and port number. If
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* successful, the 'hostent' is returned and the forth argument will point to
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* memory we need to free after use. That memory *MUST* be freed with
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* Curl_freeaddrinfo(), nothing else.
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*
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* Each resolver backend must of course make sure to return data in the
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* correct format to comply with this.
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*/
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struct Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
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const char *hostname,
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int port,
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int *waitp);
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#ifndef CURLRES_ASYNCH
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/* convert these functions if an asynch resolver isn't used */
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#define Curl_resolver_cancel(x) Curl_nop_stmt
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#define Curl_resolver_kill(x) Curl_nop_stmt
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#define Curl_resolver_is_resolved(x,y) CURLE_COULDNT_RESOLVE_HOST
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#define Curl_resolver_wait_resolv(x,y) CURLE_COULDNT_RESOLVE_HOST
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#define Curl_resolver_getsock(x,y,z) 0
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#define Curl_resolver_duphandle(x,y,z) CURLE_OK
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#define Curl_resolver_init(x,y) CURLE_OK
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#define Curl_resolver_global_init() CURLE_OK
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#define Curl_resolver_global_cleanup() Curl_nop_stmt
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#define Curl_resolver_cleanup(x) Curl_nop_stmt
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#endif
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#ifdef CURLRES_ASYNCH
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#define Curl_resolver_asynch() 1
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#else
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#define Curl_resolver_asynch() 0
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#endif
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/********** end of generic resolver interface functions *****************/
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#endif /* HEADER_CURL_ASYN_H */
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