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- /*
- * Copyright (c) 1983 Eric P. Allman
- * Copyright (c) 1988 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- # include "sendmail.h"
-
- #ifndef lint
- #ifdef SMTP
- static char sccsid[] = "@(#)usersmtp.c 5.16 (Berkeley) 3/2/91 (with SMTP)";
- #else
- static char sccsid[] = "@(#)usersmtp.c 5.16 (Berkeley) 3/2/91 (without SMTP)";
- #endif
- #endif /* not lint */
-
- # include <sysexits.h>
- # include <errno.h>
-
- # ifdef 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.
- **
- ** 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.
- ** If not EX_OK, it should close the connection.
- **
- ** 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];
- static int greettimeout();
-
- /*
- ** Open the connection to the mailer.
- */
-
- if (SmtpState == SMTP_OPEN)
- syserr("smtpinit: already open");
-
- SmtpIn = SmtpOut = NULL;
- SmtpState = SMTP_CLOSED;
- SmtpError[0] = '\0';
- SmtpPhase = "user open";
- setproctitle("%s %s: %s", CurEnv->e_id, pvp[1], SmtpPhase);
- SmtpPid = openmailer(m, pvp, (ADDRESS *) NULL, TRUE, &SmtpOut, &SmtpIn);
- if (SmtpPid < 0)
- {
- if (tTd(18, 1))
- printf("smtpinit: cannot open %s: stat %d errno %d\n",
- pvp[0], ExitStat, errno);
- if (CurEnv->e_xfp != NULL)
- {
- register char *p;
- extern char *errstring();
- extern char *statstring();
-
- if (errno == 0)
- {
- p = statstring(ExitStat);
- fprintf(CurEnv->e_xfp,
- "%.3s %s.%s... %s\n",
- p, pvp[1], m->m_name, p);
- }
- else
- {
- r = errno;
- fprintf(CurEnv->e_xfp,
- "421 %s.%s... Deferred: %s\n",
- pvp[1], m->m_name, errstring(errno));
- errno = r;
- }
- }
- return (ExitStat);
- }
- SmtpState = SMTP_OPEN;
-
- /*
- ** Get the greeting message.
- ** This should appear spontaneously. Give it five minutes to
- ** happen.
- */
-
- if (setjmp(CtxGreeting) != 0)
- goto tempfail;
- gte = setevent((time_t) 300, greettimeout, 0);
- SmtpPhase = "greeting wait";
- setproctitle("%s %s: %s", CurEnv->e_id, CurHostName, SmtpPhase);
- r = reply(m);
- clrevent(gte);
- if (r < 0 || REPLYTYPE(r) != 2)
- goto tempfail;
-
- /*
- ** Send the HELO command.
- ** My mother taught me to always introduce myself.
- */
-
- smtpmessage("HELO %s", m, MyHostName);
- SmtpPhase = "HELO wait";
- setproctitle("%s %s: %s", CurEnv->e_id, CurHostName, SmtpPhase);
- r = reply(m);
- if (r < 0)
- goto tempfail;
- else if (REPLYTYPE(r) == 5)
- goto unavailable;
- else if (REPLYTYPE(r) != 2)
- goto 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)
- goto tempfail;
-
- /* tell it we will be sending one transaction only */
- smtpmessage("ONEX", m);
- r = reply(m);
- if (r < 0)
- goto tempfail;
- }
-
- /*
- ** 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);
- }
- else
- {
- smtpmessage("MAIL From:<@%s%c%s>", m, MyHostName,
- buf[0] == '@' ? ',' : ':', buf);
- }
- SmtpPhase = "MAIL wait";
- setproctitle("%s %s: %s", CurEnv->e_id, CurHostName, SmtpPhase);
- r = reply(m);
- if (r < 0 || REPLYTYPE(r) == 4)
- goto tempfail;
- else if (r == 250)
- return (EX_OK);
- else if (r == 552)
- goto unavailable;
-
- /* protocol error -- close up */
- smtpquit(m);
- return (EX_PROTOCOL);
-
- /* signal a temporary failure */
- tempfail:
- smtpquit(m);
- return (EX_TEMPFAIL);
-
- /* signal service unavailable */
- unavailable:
- smtpquit(m);
- return (EX_UNAVAILABLE);
- }
-
-
- 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));
-
- SmtpPhase = "RCPT wait";
- setproctitle("%s %s: %s", CurEnv->e_id, CurHostName, SmtpPhase);
- 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);
- SmtpPhase = "DATA wait";
- setproctitle("%s %s: %s", CurEnv->e_id, CurHostName, SmtpPhase);
- 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 */
- SmtpPhase = "result wait";
- setproctitle("%s %s: %s", CurEnv->e_id, CurHostName, SmtpPhase);
- 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:
- ** m -- a pointer to the mailer.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** sends the final protocol and closes the connection.
- */
-
- smtpquit(m)
- 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, m->m_argv[0]);
- if (i != EX_OK)
- syserr("smtpquit %s: stat %d", m->m_argv[0], 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 */
-
- /* if the remote end closed early, fake an error */
- if (errno == 0)
- # ifdef ECONNRESET
- errno = ECONNRESET;
- # else ECONNRESET
- errno = EPIPE;
- # endif ECONNRESET
-
- message(Arpa_TSyserr, "reply: read error");
- /* if debugging, pause so we can see state */
- if (tTd(18, 100))
- pause();
- # ifdef LOG
- syslog(LOG_INFO, "%s", &MsgBuf[4]);
- # endif LOG
- SmtpState = SMTP_CLOSED;
- smtpquit(m);
- return (-1);
- }
- 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);
- SmtpMsgBuffer[0] = '\0';
-
- /* 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]))
- 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(m);
- }
-
- /* save temporary failure messages for posterity */
- if (SmtpReplyBuffer[0] == '4' && SmtpError[0] == '\0')
- (void) strcpy(SmtpError, &SmtpReplyBuffer[4]);
-
- 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;
- {
- (void) sprintf(SmtpMsgBuffer, f, a, b, c);
- if (tTd(18, 1) || (Verbose && !HoldErrs))
- nmessage(Arpa_Info, ">>> %s", SmtpMsgBuffer);
- if (SmtpOut != NULL)
- fprintf(SmtpOut, "%s%s", SmtpMsgBuffer,
- m == 0 ? "\r\n" : m->m_eol);
- }
-
- # endif SMTP
-