1 #ifndef HEADER_CURL_PINGPONG_H
2 #define HEADER_CURL_PINGPONG_H
3 /***************************************************************************
5 * Project ___| | | | _ \| |
7 * | (__| |_| | _ <| |___
8 * \___|\___/|_| \_\_____|
10 * Copyright (C) 1998 - 2021, 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 ***************************************************************************/
25 #include "curl_setup.h"
27 #if !defined(CURL_DISABLE_IMAP) || !defined(CURL_DISABLE_FTP) || \
28 !defined(CURL_DISABLE_POP3) || !defined(CURL_DISABLE_SMTP)
32 /* forward-declaration, this is defined in urldata.h */
36 PPTRANSFER_BODY, /* yes do transfer a body */
37 PPTRANSFER_INFO, /* do still go through to get info/headers */
38 PPTRANSFER_NONE /* don't get anything and don't get info */
42 * 'pingpong' is the generic struct used for protocols doing server<->client
43 * conversations in a back-and-forth style such as FTP, IMAP, POP3, SMTP etc.
45 * It holds response cache and non-blocking sending data.
48 char *cache; /* data cache between getresponse()-calls */
49 size_t cache_size; /* size of cache in bytes */
50 size_t nread_resp; /* number of bytes currently read of a server response */
51 char *linestart_resp; /* line start pointer for the server response
53 bool pending_resp; /* set TRUE when a server response is pending or in
54 progress, and is cleared once the last response is
56 char *sendthis; /* allocated pointer to a buffer that is to be sent to the
58 size_t sendleft; /* number of bytes left to send from the sendthis buffer */
59 size_t sendsize; /* total size of the sendthis buffer */
60 struct curltime response; /* set to Curl_now() when a command has been sent
61 off, used to time-out response reading */
62 timediff_t response_time; /* When no timeout is given, this is the amount of
63 milliseconds we await for a server response. */
64 struct dynbuf sendbuf;
66 /* Function pointers the protocols MUST implement and provide for the
67 pingpong layer to function */
69 CURLcode (*statemachine)(struct Curl_easy *data, struct connectdata *conn);
70 bool (*endofresp)(struct Curl_easy *data, struct connectdata *conn,
71 char *ptr, size_t len, int *code);
74 #define PINGPONG_SETUP(pp,s,e) \
76 pp->response_time = RESP_TIMEOUT; \
77 pp->statemachine = s; \
84 * called repeatedly until done. Set 'wait' to make it wait a while on the
85 * socket if there's no traffic.
87 CURLcode Curl_pp_statemach(struct Curl_easy *data, struct pingpong *pp,
88 bool block, bool disconnecting);
90 /* initialize stuff to prepare for reading a fresh new response */
91 void Curl_pp_init(struct Curl_easy *data, struct pingpong *pp);
93 /* setup for the transfer */
94 void Curl_pp_setup(struct pingpong *pp);
96 /* Returns timeout in ms. 0 or negative number means the timeout has already
98 timediff_t Curl_pp_state_timeout(struct Curl_easy *data,
99 struct pingpong *pp, bool disconnecting);
102 /***********************************************************************
106 * Send the formatted string as a command to a pingpong server. Note that
107 * the string should not have any CRLF appended, as this function will
108 * append the necessary things itself.
110 * made to never block
112 CURLcode Curl_pp_sendf(struct Curl_easy *data,
114 const char *fmt, ...);
116 /***********************************************************************
120 * Send the formatted string as a command to a pingpong server. Note that
121 * the string should not have any CRLF appended, as this function will
122 * append the necessary things itself.
124 * made to never block
126 CURLcode Curl_pp_vsendf(struct Curl_easy *data,
134 * Reads a piece of a server response.
136 CURLcode Curl_pp_readresp(struct Curl_easy *data,
137 curl_socket_t sockfd,
139 int *code, /* return the server code if done */
140 size_t *size); /* size of the response */
143 CURLcode Curl_pp_flushsend(struct Curl_easy *data,
144 struct pingpong *pp);
146 /* call this when a pingpong connection is disconnected */
147 CURLcode Curl_pp_disconnect(struct pingpong *pp);
149 int Curl_pp_getsock(struct Curl_easy *data, struct pingpong *pp,
150 curl_socket_t *socks);
153 /***********************************************************************
157 * Returns whether there are still more data in the cache and so a call
158 * to Curl_pp_readresp() will not block.
160 bool Curl_pp_moredata(struct pingpong *pp);
162 #endif /* HEADER_CURL_PINGPONG_H */