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    1: #ifndef HEADER_CURL_SMTP_H
    2: #define HEADER_CURL_SMTP_H
    3: /***************************************************************************
    4:  *                                  _   _ ____  _
    5:  *  Project                     ___| | | |  _ \| |
    6:  *                             / __| | | | |_) | |
    7:  *                            | (__| |_| |  _ <| |___
    8:  *                             \___|\___/|_| \_\_____|
    9:  *
   10:  * Copyright (C) 2009 - 2020, 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.haxx.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:  ***************************************************************************/
   31: typedef 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. */
   54: struct 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:   int rcpt_last_error;     /* The last error received for RCPT TO command */
   61:   size_t eob;              /* Number of bytes of the EOB (End Of Body) that
   62:                               have been received so far */
   63:   bool trailing_crlf;      /* Specifies if the tailing CRLF is present */
   64: };
   65: 
   66: /* smtp_conn is used for struct connection-oriented data in the connectdata
   67:    struct */
   68: struct 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: 
   82: extern const struct Curl_handler Curl_handler_smtp;
   83: extern 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: 
   94: CURLcode Curl_smtp_escape_eob(struct connectdata *conn, const ssize_t nread);
   95: 
   96: #endif /* HEADER_CURL_SMTP_H */