* Copyright (c) 1983 Eric P. Allman
* Copyright (c) 1988 Regents of the University of California.
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
static char sccsid
[] = "@(#)usersmtp.c 5.11 (Berkeley) %G% (with SMTP)";
static char sccsid
[] = "@(#)usersmtp.c 5.11 (Berkeley) %G% (without SMTP)";
** USERSMTP -- run SMTP protocol from the user end.
** This protocol is described in RFC821.
#define REPLYTYPE(r) ((r) / 100) /* first digit of reply code */
#define REPLYCLASS(r) (((r) / 10) % 10) /* second digit of reply code */
#define SMTPCLOSING 421 /* "Service Shutting Down" */
char SmtpMsgBuffer
[MAXLINE
]; /* buffer for commands */
char SmtpReplyBuffer
[MAXLINE
]; /* buffer for replies */
char SmtpError
[MAXLINE
] = ""; /* save failure error messages */
FILE *SmtpOut
; /* output file */
FILE *SmtpIn
; /* input file */
int SmtpPid
; /* pid of mailer */
/* following represents the state of the SMTP connection */
int SmtpState
; /* connection state, see below */
#define SMTP_CLOSED 0 /* connection is closed */
#define SMTP_OPEN 1 /* connection is open for business */
#define SMTP_SSD 2 /* service shutting down */
** SMTPINIT -- initialize SMTP.
** Opens the connection and sends the initial protocol.
** m -- mailer to create connection to.
** pvp -- pointer to parameter vector to pass to
** appropriate exit status -- EX_OK on success.
** If not EX_OK, it should close the connection.
** creates connection and sends initial protocol.
** Open the connection to the mailer.
if (SmtpState
== SMTP_OPEN
)
syserr("smtpinit: already open");
SmtpPid
= openmailer(m
, pvp
, (ADDRESS
*) NULL
, TRUE
, &SmtpOut
, &SmtpIn
);
printf("smtpinit: cannot open %s: stat %d errno %d\n",
pvp
[0], ExitStat
, errno
);
if (CurEnv
->e_xfp
!= NULL
)
extern char *errstring();
extern char *statstring();
p
= statstring(ExitStat
);
p
, pvp
[1], m
->m_name
, p
);
"421 %s.%s... Deferred: %s\n",
pvp
[1], m
->m_name
, errstring(errno
));
** Get the greeting message.
** This should appear spontaneously. Give it five minutes to
if (setjmp(CtxGreeting
) != 0)
gte
= setevent((time_t) 300, greettimeout
, 0);
SmtpPhase
= "greeting wait";
if (r
< 0 || REPLYTYPE(r
) != 2)
** Send the HELO command.
** My mother taught me to always introduce myself.
smtpmessage("HELO %s", m
, MyHostName
);
else if (REPLYTYPE(r
) == 5)
else if (REPLYTYPE(r
) != 2)
** If this is expected to be another sendmail, send some internal
if (bitnset(M_INTERNAL
, m
->m_flags
))
/* tell it to be verbose */
/* tell it we will be sending one transaction only */
** Send the HOPS command.
** This is non-standard and may give an "unknown command".
** It can give a "bad hop count" error if the hop
** Send the MAIL command.
** Designates the sender.
expand("\001g", buf
, &buf
[sizeof buf
- 1], CurEnv
);
if (CurEnv
->e_from
.q_mailer
== LocalMailer
||
!bitnset(M_FROMPATH
, m
->m_flags
))
smtpmessage("MAIL From:<%s>", m
, buf
);
smtpmessage("MAIL From:<@%s%c%s>", m
, MyHostName
,
buf
[0] == '@' ? ',' : ':', buf
);
if (r
< 0 || REPLYTYPE(r
) == 4)
/* protocol error -- close up */
/* signal a temporary failure */
/* signal service unavailable */
/* timeout reading the greeting message */
** SMTPRCPT -- designate recipient.
** to -- address of recipient.
** m -- the mailer we are sending to.
** exit status corresponding to recipient status.
** Sends the mail via SMTP.
extern char *remotename();
smtpmessage("RCPT To:<%s>", m
, remotename(to
->q_user
, m
, FALSE
, TRUE
));
if (r
< 0 || REPLYTYPE(r
) == 4)
else if (REPLYTYPE(r
) == 2)
else if (r
== 550 || r
== 551 || r
== 553)
else if (r
== 552 || r
== 554)
** SMTPDATA -- send the data and clean up the transaction.
** m -- mailer being sent to.
** e -- the envelope for this message.
** exit status corresponding to DATA command.
** First send the command and check that it is ok.
** Follow it up with a dot to terminate.
** Finally get the results of the transaction.
/* send the command and check ok to proceed */
if (r
< 0 || REPLYTYPE(r
) == 4)
/* now output the actual message */
(*e
->e_puthdr
)(SmtpOut
, m
, CurEnv
);
putline("\n", SmtpOut
, m
);
(*e
->e_putbody
)(SmtpOut
, m
, CurEnv
);
/* terminate the message */
fprintf(SmtpOut
, ".%s", m
->m_eol
);
if (Verbose
&& !HoldErrs
)
nmessage(Arpa_Info
, ">>> .");
/* check for the results of the transaction */
SmtpPhase
= "result wait";
if (r
< 0 || REPLYTYPE(r
) == 4)
else if (r
== 552 || r
== 554)
** SMTPQUIT -- close the SMTP connection.
** m -- a pointer to the mailer.
** sends the final protocol and closes the connection.
/* if the connection is already closed, don't bother */
/* send the quit message if not a forced quit */
if (SmtpState
== SMTP_OPEN
|| SmtpState
== SMTP_SSD
)
if (SmtpState
== SMTP_CLOSED
)
/* now actually close the connection */
/* and pick up the zombie */
i
= endmailer(SmtpPid
, m
->m_argv
[0]);
syserr("smtpquit %s: stat %d", m
->m_argv
[0], i
);
** REPLY -- read arpanet reply
** m -- the mailer we are reading the reply from.
** flushes the mail file.
** Read the input line, being careful not to hang.
/* actually do the read */
if (CurEnv
->e_xfp
!= NULL
)
(void) fflush(CurEnv
->e_xfp
); /* for debugging */
/* if we are in the process of closing just give the code */
if (SmtpState
== SMTP_CLOSED
)
/* get the line from the other side */
p
= sfgets(SmtpReplyBuffer
, sizeof SmtpReplyBuffer
, SmtpIn
);
extern char MsgBuf
[]; /* err.c */
extern char Arpa_TSyserr
[]; /* conf.c */
/* if the remote end closed early, fake an error */
message(Arpa_TSyserr
, "reply: read error");
/* if debugging, pause so we can see state */
syslog(LOG_INFO
, "%s", &MsgBuf
[4]);
fixcrlf(SmtpReplyBuffer
, TRUE
);
if (CurEnv
->e_xfp
!= NULL
&& index("45", SmtpReplyBuffer
[0]) != NULL
)
/* serious error -- log the previous command */
if (SmtpMsgBuffer
[0] != '\0')
fprintf(CurEnv
->e_xfp
, ">>> %s\n", SmtpMsgBuffer
);
/* now log the message as from the other side */
fprintf(CurEnv
->e_xfp
, "<<< %s\n", SmtpReplyBuffer
);
/* display the input for verbose mode */
if (Verbose
&& !HoldErrs
)
nmessage(Arpa_Info
, "%s", SmtpReplyBuffer
);
/* if continuation is required, we can go on */
if (SmtpReplyBuffer
[3] == '-' || !isdigit(SmtpReplyBuffer
[0]))
/* decode the reply code */
r
= atoi(SmtpReplyBuffer
);
/* extra semantics: 0xx codes are "informational" */
/* reply code 421 is "Service Shutting Down" */
if (r
== SMTPCLOSING
&& SmtpState
!= SMTP_SSD
)
/* send the quit protocol */
/* save temporary failure messages for posterity */
if (SmtpReplyBuffer
[0] == '4' && SmtpError
[0] == '\0')
(void) strcpy(SmtpError
, &SmtpReplyBuffer
[4]);
** SMTPMESSAGE -- send message to server
** m -- the mailer to control formatting.
** writes message to SmtpOut.
smtpmessage(f
, m
, a
, b
, c
)
(void) sprintf(SmtpMsgBuffer
, f
, a
, b
, c
);
if (tTd(18, 1) || (Verbose
&& !HoldErrs
))
nmessage(Arpa_Info
, ">>> %s", SmtpMsgBuffer
);
fprintf(SmtpOut
, "%s%s", SmtpMsgBuffer
, m
->m_eol
);