2.9BSD/usr/src/ucb/sendmail/src/usersmtp.c
# include <ctype.h>
# include <sysexits.h>
# include "sendmail.h"
# ifndef SMTP
SCCSID(@(#)usersmtp.c 4.2 8/31/83 (no SMTP));
# else SMTP
SCCSID(@(#)usersmtp.c 4.2 8/31/83);
/*
** 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 SmtpReplyBuffer[MAXLINE]; /* buffer for replies */
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.
**
** Parameters:
** m -- mailer to create connection to.
** pvp -- pointer to parameter vector to pass to
** the mailer.
**
** Returns:
** appropriate exit status -- EX_OK on success.
**
** Side Effects:
** creates connection and sends initial protocol.
*/
jmp_buf CtxGreeting;
smtpinit(m, pvp)
struct mailer *m;
char **pvp;
{
register int r;
EVENT *gte;
char buf[MAXNAME];
extern greettimeout();
/*
** Open the connection to the mailer.
*/
#ifdef DEBUG
if (SmtpState == SMTP_OPEN)
syserr("smtpinit: already open");
#endif DEBUG
SmtpIn = SmtpOut = NULL;
SmtpState = SMTP_CLOSED;
SmtpPid = openmailer(m, pvp, (ADDRESS *) NULL, TRUE, &SmtpOut, &SmtpIn);
if (SmtpPid < 0)
{
# ifdef DEBUG
if (tTd(18, 1))
printf("smtpinit: cannot open %s: stat %d errno %d\n",
pvp[0], ExitStat, errno);
# endif DEBUG
return (ExitStat);
}
SmtpState = SMTP_OPEN;
/*
** Get the greeting message.
** This should appear spontaneously. Give it two minutes to
** happen.
*/
if (setjmp(CtxGreeting) != 0)
return (EX_TEMPFAIL);
gte = setevent((time_t) 120, greettimeout, 0);
r = reply(m);
clrevent(gte);
if (r < 0 || REPLYTYPE(r) != 2)
return (EX_TEMPFAIL);
/*
** Send the HELO command.
** My mother taught me to always introduce myself.
*/
smtpmessage("HELO %s", m, HostName);
r = reply(m);
if (r < 0)
return (EX_TEMPFAIL);
else if (REPLYTYPE(r) == 5)
return (EX_UNAVAILABLE);
else if (REPLYTYPE(r) != 2)
return (EX_TEMPFAIL);
/*
** If this is expected to be another sendmail, send some internal
** commands.
*/
if (bitnset(M_INTERNAL, m->m_flags))
{
/* tell it to be verbose */
smtpmessage("VERB", m);
r = reply(m);
if (r < 0)
return (EX_TEMPFAIL);
/* tell it we will be sending one transaction only */
smtpmessage("ONEX", m);
r = reply(m);
if (r < 0)
return (EX_TEMPFAIL);
}
/*
** Send the MAIL command.
** Designates the sender.
*/
expand("$g", 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);
}
else
{
smtpmessage("MAIL From:<@%s%c%s>", m, HostName,
buf[0] == '@' ? ',' : ':', buf);
}
r = reply(m);
if (r < 0 || REPLYTYPE(r) == 4)
return (EX_TEMPFAIL);
else if (r == 250)
return (EX_OK);
else if (r == 552)
return (EX_UNAVAILABLE);
return (EX_PROTOCOL);
}
static
greettimeout()
{
/* timeout reading the greeting message */
longjmp(CtxGreeting, 1);
}
/*
** SMTPRCPT -- designate recipient.
**
** Parameters:
** to -- address of recipient.
** m -- the mailer we are sending to.
**
** Returns:
** exit status corresponding to recipient status.
**
** Side Effects:
** Sends the mail via SMTP.
*/
smtprcpt(to, m)
ADDRESS *to;
register MAILER *m;
{
register int r;
extern char *remotename();
smtpmessage("RCPT To:<%s>", m, remotename(to->q_user, m, FALSE, TRUE));
r = reply(m);
if (r < 0 || REPLYTYPE(r) == 4)
return (EX_TEMPFAIL);
else if (REPLYTYPE(r) == 2)
return (EX_OK);
else if (r == 550 || r == 551 || r == 553)
return (EX_NOUSER);
else if (r == 552 || r == 554)
return (EX_UNAVAILABLE);
return (EX_PROTOCOL);
}
/*
** SMTPDATA -- send the data and clean up the transaction.
**
** Parameters:
** m -- mailer being sent to.
** e -- the envelope for this message.
**
** Returns:
** exit status corresponding to DATA command.
**
** Side Effects:
** none.
*/
smtpdata(m, e)
struct mailer *m;
register ENVELOPE *e;
{
register int r;
/*
** Send the data.
** First send the command and check that it is ok.
** Then send the data.
** Follow it up with a dot to terminate.
** Finally get the results of the transaction.
*/
/* send the command and check ok to proceed */
smtpmessage("DATA", m);
r = reply(m);
if (r < 0 || REPLYTYPE(r) == 4)
return (EX_TEMPFAIL);
else if (r == 554)
return (EX_UNAVAILABLE);
else if (r != 354)
return (EX_PROTOCOL);
/* 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 */
r = reply(m);
if (r < 0 || REPLYTYPE(r) == 4)
return (EX_TEMPFAIL);
else if (r == 250)
return (EX_OK);
else if (r == 552 || r == 554)
return (EX_UNAVAILABLE);
return (EX_PROTOCOL);
}
/*
** SMTPQUIT -- close the SMTP connection.
**
** Parameters:
** name -- name of mailer we are quitting.
**
** Returns:
** none.
**
** Side Effects:
** sends the final protocol and closes the connection.
*/
smtpquit(name, m)
char *name;
register MAILER *m;
{
int i;
/* if the connection is already closed, don't bother */
if (SmtpIn == NULL)
return;
/* send the quit message if not a forced quit */
if (SmtpState == SMTP_OPEN || SmtpState == SMTP_SSD)
{
smtpmessage("QUIT", m);
(void) reply(m);
if (SmtpState == SMTP_CLOSED)
return;
}
/* now actually close the connection */
(void) fclose(SmtpIn);
(void) fclose(SmtpOut);
SmtpIn = SmtpOut = NULL;
SmtpState = SMTP_CLOSED;
/* and pick up the zombie */
i = endmailer(SmtpPid, name);
if (i != EX_OK)
syserr("smtpquit %s: stat %d", name, i);
}
/*
** REPLY -- read arpanet reply
**
** Parameters:
** m -- the mailer we are reading the reply from.
**
** Returns:
** reply code it reads.
**
** Side Effects:
** flushes the mail file.
*/
reply(m)
MAILER *m;
{
(void) fflush(SmtpOut);
if (tTd(18, 1))
printf("reply\n");
/*
** Read the input line, being careful not to hang.
*/
for (;;)
{
register int r;
register char *p;
/* 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)
return (SMTPCLOSING);
/* get the line from the other side */
p = sfgets(SmtpReplyBuffer, sizeof SmtpReplyBuffer, SmtpIn);
if (p == NULL)
{
extern char MsgBuf[]; /* err.c */
extern char Arpa_TSyserr[]; /* conf.c */
message(Arpa_TSyserr, "reply: read error");
# ifdef DEBUG
/* if debugging, pause so we can see state */
if (tTd(18, 100))
pause();
# endif DEBUG
# ifdef LOG
syslog(LOG_ERR, "%s", &MsgBuf[4]);
# endif LOG
SmtpState = SMTP_CLOSED;
smtpquit("reply error", m);
return (-1);
}
fixcrlf(SmtpReplyBuffer, TRUE);
/* log the input in the transcript for future error returns */
if (Verbose && !HoldErrs)
nmessage(Arpa_Info, "%s", SmtpReplyBuffer);
else if (CurEnv->e_xfp != NULL)
fprintf(CurEnv->e_xfp, "%s\n", SmtpReplyBuffer);
/* if continuation is required, we can go on */
if (SmtpReplyBuffer[3] == '-' || !isdigit(SmtpReplyBuffer[0]))
continue;
/* decode the reply code */
r = atoi(SmtpReplyBuffer);
/* extra semantics: 0xx codes are "informational" */
if (r < 100)
continue;
/* reply code 421 is "Service Shutting Down" */
if (r == SMTPCLOSING && SmtpState != SMTP_SSD)
{
/* send the quit protocol */
SmtpState = SMTP_SSD;
smtpquit("SMTP Shutdown", m);
}
return (r);
}
}
/*
** SMTPMESSAGE -- send message to server
**
** Parameters:
** f -- format
** m -- the mailer to control formatting.
** a, b, c -- parameters
**
** Returns:
** none.
**
** Side Effects:
** writes message to SmtpOut.
*/
/*VARARGS1*/
smtpmessage(f, m, a, b, c)
char *f;
MAILER *m;
{
char buf[MAXLINE];
(void) sprintf(buf, f, a, b, c);
if (tTd(18, 1) || (Verbose && !HoldErrs))
nmessage(Arpa_Info, ">>> %s", buf);
else if (CurEnv->e_xfp != NULL)
fprintf(CurEnv->e_xfp, ">>> %s\n", buf);
if (SmtpOut != NULL)
fprintf(SmtpOut, "%s%s", buf, m->m_eol);
}
# endif SMTP