1#ifndef HEADER_CURL_SMTP_H
2#define HEADER_CURL_SMTP_H
3/***************************************************************************
4 * _ _ ____ _
5 * Project ___| | | | _ \| |
6 * / __| | | | |_) | |
7 * | (__| |_| | _ <| |___
8 * \___|\___/|_| \_\_____|
9 *
10 * Copyright (C) 2009 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
11 *
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.
15 *
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.
19 *
20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21 * KIND, either express or implied.
22 *
23 ***************************************************************************/
24
25#include "pingpong.h"
26#include "curl_sasl.h"
27
28/****************************************************************************
29 * SMTP unique setup
30 ***************************************************************************/
31typedef enum {
32 SMTP_STOP, /* do nothing state, stops the state machine */
33 SMTP_SERVERGREET, /* waiting for the initial greeting immediately after
34 a connect */
35 SMTP_EHLO,
36 SMTP_HELO,
37 SMTP_STARTTLS,
38 SMTP_UPGRADETLS, /* asynchronously upgrade the connection to SSL/TLS
39 (multi mode only) */
40 SMTP_AUTH,
41 SMTP_COMMAND, /* VRFY, EXPN, NOOP, RSET and HELP */
42 SMTP_MAIL, /* MAIL FROM */
43 SMTP_RCPT, /* RCPT TO */
44 SMTP_DATA,
45 SMTP_POSTDATA,
46 SMTP_QUIT,
47 SMTP_LAST /* never used */
48} smtpstate;
49
50/* This SMTP struct is used in the Curl_easy. All SMTP data that is
51 connection-oriented must be in smtp_conn to properly deal with the fact that
52 perhaps the Curl_easy is changed between the times the connection is
53 used. */
54struct SMTP {
55 curl_pp_transfer transfer;
56 char *custom; /* Custom Request */
57 struct curl_slist *rcpt; /* Recipient list */
58 bool rcpt_had_ok; /* Whether any of RCPT TO commands (depends on
59 total number of recipients) succeeded so far */
60 bool trailing_crlf; /* Specifies if the trailing CRLF is present */
61 int rcpt_last_error; /* The last error received for RCPT TO command */
62 size_t eob; /* Number of bytes of the EOB (End Of Body) that
63 have been received so far */
64};
65
66/* smtp_conn is used for struct connection-oriented data in the connectdata
67 struct */
68struct smtp_conn {
69 struct pingpong pp;
70 smtpstate state; /* Always use smtp.c:state() to change state! */
71 bool ssldone; /* Is connect() over SSL done? */
72 char *domain; /* Client address/name to send in the EHLO */
73 struct SASL sasl; /* SASL-related storage */
74 bool tls_supported; /* StartTLS capability supported by server */
75 bool size_supported; /* If server supports SIZE extension according to
76 RFC 1870 */
77 bool utf8_supported; /* If server supports SMTPUTF8 extension according
78 to RFC 6531 */
79 bool auth_supported; /* AUTH capability supported by server */
80};
81
82extern const struct Curl_handler Curl_handler_smtp;
83extern const struct Curl_handler Curl_handler_smtps;
84
85/* this is the 5-bytes End-Of-Body marker for SMTP */
86#define SMTP_EOB "\x0d\x0a\x2e\x0d\x0a"
87#define SMTP_EOB_LEN 5
88#define SMTP_EOB_FIND_LEN 3
89
90/* if found in data, replace it with this string instead */
91#define SMTP_EOB_REPL "\x0d\x0a\x2e\x2e"
92#define SMTP_EOB_REPL_LEN 4
93
94CURLcode Curl_smtp_escape_eob(struct Curl_easy *data, const ssize_t nread);
95
96#endif /* HEADER_CURL_SMTP_H */
97