1 #ifndef HEADER_CURL_PINGPONG_H
2 #define HEADER_CURL_PINGPONG_H
3 /***************************************************************************
5 * Project ___| | | | _ \| |
7 * | (__| |_| | _ <| |___
8 * \___|\___/|_| \_\_____|
10 * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
12 * This software is licensed as described in the file COPYING, which
13 * you should have received as part of this distribution. The terms
14 * are also available at https://curl.se/docs/copyright.html.
16 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
17 * copies of the Software, and permit persons to whom the Software is
18 * furnished to do so, under the terms of the COPYING file.
20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21 * KIND, either express or implied.
23 * SPDX-License-Identifier: curl
25 ***************************************************************************/
27 #include "curl_setup.h"
29 #if !defined(CURL_DISABLE_IMAP) || !defined(CURL_DISABLE_FTP) || \
30 !defined(CURL_DISABLE_POP3) || !defined(CURL_DISABLE_SMTP)
34 /* forward-declaration, this is defined in urldata.h */
38 PPTRANSFER_BODY, /* yes do transfer a body */
39 PPTRANSFER_INFO, /* do still go through to get info/headers */
40 PPTRANSFER_NONE /* don't get anything and don't get info */
44 * 'pingpong' is the generic struct used for protocols doing server<->client
45 * conversations in a back-and-forth style such as FTP, IMAP, POP3, SMTP etc.
47 * It holds response cache and non-blocking sending data.
50 char *cache; /* data cache between getresponse()-calls */
51 size_t cache_size; /* size of cache in bytes */
52 size_t nread_resp; /* number of bytes currently read of a server response */
53 char *linestart_resp; /* line start pointer for the server response
55 bool pending_resp; /* set TRUE when a server response is pending or in
56 progress, and is cleared once the last response is
58 char *sendthis; /* allocated pointer to a buffer that is to be sent to the
60 size_t sendleft; /* number of bytes left to send from the sendthis buffer */
61 size_t sendsize; /* total size of the sendthis buffer */
62 struct curltime response; /* set to Curl_now() when a command has been sent
63 off, used to time-out response reading */
64 timediff_t response_time; /* When no timeout is given, this is the amount of
65 milliseconds we await for a server response. */
66 struct dynbuf sendbuf;
68 /* Function pointers the protocols MUST implement and provide for the
69 pingpong layer to function */
71 CURLcode (*statemachine)(struct Curl_easy *data, struct connectdata *conn);
72 bool (*endofresp)(struct Curl_easy *data, struct connectdata *conn,
73 char *ptr, size_t len, int *code);
76 #define PINGPONG_SETUP(pp,s,e) \
78 pp->response_time = RESP_TIMEOUT; \
79 pp->statemachine = s; \
86 * called repeatedly until done. Set 'wait' to make it wait a while on the
87 * socket if there's no traffic.
89 CURLcode Curl_pp_statemach(struct Curl_easy *data, struct pingpong *pp,
90 bool block, bool disconnecting);
92 /* initialize stuff to prepare for reading a fresh new response */
93 void Curl_pp_init(struct Curl_easy *data, struct pingpong *pp);
95 /* setup for the transfer */
96 void Curl_pp_setup(struct pingpong *pp);
98 /* Returns timeout in ms. 0 or negative number means the timeout has already
100 timediff_t Curl_pp_state_timeout(struct Curl_easy *data,
101 struct pingpong *pp, bool disconnecting);
104 /***********************************************************************
108 * Send the formatted string as a command to a pingpong server. Note that
109 * the string should not have any CRLF appended, as this function will
110 * append the necessary things itself.
112 * made to never block
114 CURLcode Curl_pp_sendf(struct Curl_easy *data,
116 const char *fmt, ...);
118 /***********************************************************************
122 * Send the formatted string as a command to a pingpong server. Note that
123 * the string should not have any CRLF appended, as this function will
124 * append the necessary things itself.
126 * made to never block
128 CURLcode Curl_pp_vsendf(struct Curl_easy *data,
136 * Reads a piece of a server response.
138 CURLcode Curl_pp_readresp(struct Curl_easy *data,
139 curl_socket_t sockfd,
141 int *code, /* return the server code if done */
142 size_t *size); /* size of the response */
145 CURLcode Curl_pp_flushsend(struct Curl_easy *data,
146 struct pingpong *pp);
148 /* call this when a pingpong connection is disconnected */
149 CURLcode Curl_pp_disconnect(struct pingpong *pp);
151 int Curl_pp_getsock(struct Curl_easy *data, struct pingpong *pp,
152 curl_socket_t *socks);
155 /***********************************************************************
159 * Returns whether there are still more data in the cache and so a call
160 * to Curl_pp_readresp() will not block.
162 bool Curl_pp_moredata(struct pingpong *pp);
164 #endif /* HEADER_CURL_PINGPONG_H */