165 lines
6.0 KiB
C
165 lines
6.0 KiB
C
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#ifndef HEADER_CURL_PINGPONG_H
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#define HEADER_CURL_PINGPONG_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) 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.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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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if !defined(CURL_DISABLE_IMAP) || !defined(CURL_DISABLE_FTP) || \
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!defined(CURL_DISABLE_POP3) || !defined(CURL_DISABLE_SMTP)
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#define USE_PINGPONG
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#endif
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/* forward-declaration, this is defined in urldata.h */
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struct connectdata;
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typedef enum {
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PPTRANSFER_BODY, /* yes do transfer a body */
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PPTRANSFER_INFO, /* do still go through to get info/headers */
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PPTRANSFER_NONE /* don't get anything and don't get info */
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} curl_pp_transfer;
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/*
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* 'pingpong' is the generic struct used for protocols doing server<->client
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* conversations in a back-and-forth style such as FTP, IMAP, POP3, SMTP etc.
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*
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* It holds response cache and non-blocking sending data.
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*/
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struct pingpong {
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char *cache; /* data cache between getresponse()-calls */
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size_t cache_size; /* size of cache in bytes */
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size_t nread_resp; /* number of bytes currently read of a server response */
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char *linestart_resp; /* line start pointer for the server response
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reader function */
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bool pending_resp; /* set TRUE when a server response is pending or in
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progress, and is cleared once the last response is
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read */
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char *sendthis; /* allocated pointer to a buffer that is to be sent to the
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server */
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size_t sendleft; /* number of bytes left to send from the sendthis buffer */
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size_t sendsize; /* total size of the sendthis buffer */
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struct curltime response; /* set to Curl_now() when a command has been sent
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off, used to time-out response reading */
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timediff_t response_time; /* When no timeout is given, this is the amount of
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milliseconds we await for a server response. */
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struct dynbuf sendbuf;
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/* Function pointers the protocols MUST implement and provide for the
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pingpong layer to function */
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CURLcode (*statemachine)(struct Curl_easy *data, struct connectdata *conn);
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bool (*endofresp)(struct Curl_easy *data, struct connectdata *conn,
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char *ptr, size_t len, int *code);
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};
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#define PINGPONG_SETUP(pp,s,e) \
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do { \
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pp->response_time = RESP_TIMEOUT; \
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pp->statemachine = s; \
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pp->endofresp = e; \
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} while(0)
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/*
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* Curl_pp_statemach()
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*
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* called repeatedly until done. Set 'wait' to make it wait a while on the
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* socket if there's no traffic.
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*/
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CURLcode Curl_pp_statemach(struct Curl_easy *data, struct pingpong *pp,
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bool block, bool disconnecting);
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/* initialize stuff to prepare for reading a fresh new response */
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void Curl_pp_init(struct Curl_easy *data, struct pingpong *pp);
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/* setup for the transfer */
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void Curl_pp_setup(struct pingpong *pp);
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/* Returns timeout in ms. 0 or negative number means the timeout has already
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triggered */
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timediff_t Curl_pp_state_timeout(struct Curl_easy *data,
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struct pingpong *pp, bool disconnecting);
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/***********************************************************************
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*
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* Curl_pp_sendf()
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*
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* Send the formatted string as a command to a pingpong server. Note that
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* the string should not have any CRLF appended, as this function will
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* append the necessary things itself.
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*
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* made to never block
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*/
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CURLcode Curl_pp_sendf(struct Curl_easy *data,
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struct pingpong *pp,
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const char *fmt, ...);
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/***********************************************************************
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*
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* Curl_pp_vsendf()
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*
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* Send the formatted string as a command to a pingpong server. Note that
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* the string should not have any CRLF appended, as this function will
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* append the necessary things itself.
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*
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* made to never block
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*/
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CURLcode Curl_pp_vsendf(struct Curl_easy *data,
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struct pingpong *pp,
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const char *fmt,
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va_list args);
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/*
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* Curl_pp_readresp()
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*
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* Reads a piece of a server response.
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*/
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CURLcode Curl_pp_readresp(struct Curl_easy *data,
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curl_socket_t sockfd,
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struct pingpong *pp,
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int *code, /* return the server code if done */
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size_t *size); /* size of the response */
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CURLcode Curl_pp_flushsend(struct Curl_easy *data,
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struct pingpong *pp);
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/* call this when a pingpong connection is disconnected */
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CURLcode Curl_pp_disconnect(struct pingpong *pp);
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int Curl_pp_getsock(struct Curl_easy *data, struct pingpong *pp,
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curl_socket_t *socks);
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/***********************************************************************
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*
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* Curl_pp_moredata()
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*
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* Returns whether there are still more data in the cache and so a call
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* to Curl_pp_readresp() will not block.
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*/
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bool Curl_pp_moredata(struct pingpong *pp);
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#endif /* HEADER_CURL_PINGPONG_H */
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