2 * sink.c -- forwarding/delivery support for fetchmail
4 * The interface of this module (open_sink(), stuff_line(), close_sink(),
5 * release_sink()) seals off the delivery logic from the protocol machine,
6 * so the latter won't have to care whether it's shipping to an [SL]MTP
7 * listener daemon or an MDA pipe.
9 * Copyright 1998 by Eric S. Raymond
10 * For license terms, see the file COPYING in this directory.
21 #endif /* HAVE_MEMORY_H */
22 #if defined(STDC_HEADERS)
25 #if defined(HAVE_UNISTD_H)
28 #if defined(HAVE_STDARG_H)
35 #include "fetchmail.h"
40 /* BSD portability hack...I know, this is an ugly place to put it */
41 #if !defined(SIGCHLD) && defined(SIGCLD)
42 #define SIGCHLD SIGCLD
45 /* makes the open_sink()/close_sink() pair non-reentrant */
46 static int lmtp_responses;
48 static int smtp_open(struct query *ctl)
49 /* try to open a socket to the appropriate SMTP server for this query */
51 /* maybe it's time to close the socket in order to force delivery */
52 if (NUM_NONZERO(ctl->batchlimit) && (ctl->smtp_socket != -1) && ++batchcount == ctl->batchlimit)
54 SockClose(ctl->smtp_socket);
55 ctl->smtp_socket = -1;
59 /* if no socket to any SMTP host is already set up, try to open one */
60 if (ctl->smtp_socket == -1)
63 * RFC 1123 requires that the domain name in HELO address is a
64 * "valid principal domain name" for the client host. If we're
65 * running in invisible mode, violate this with malice
66 * aforethought in order to make the Received headers and
69 * In fact this code relies on the RFC1123 requirement that the
70 * SMTP listener must accept messages even if verification of the
71 * HELO name fails (RFC1123 section 5.2.5, paragraph 2).
73 * How we compute the true mailhost name to pass to the
74 * listener doesn't affect behavior on RFC1123- violating
75 * listeners that check for name match; we're going to lose
76 * on those anyway because we can never give them a name
77 * that matches the local machine fetchmail is running on.
78 * What it will affect is the listener's logging.
81 const char *id_me = run.invisible ? ctl->server.truename : fetchmailhost;
87 * Run down the SMTP hunt list looking for a server that's up.
88 * Use both explicit hunt entries (value TRUE) and implicit
89 * (default) ones (value FALSE).
92 phase = LISTENER_WAIT;
94 set_timeout(ctl->server.timeout);
95 for (idp = ctl->smtphunt; idp; idp = idp->next)
97 char *cp, *parsed_host;
99 char *portnum = SMTP_PORT;
101 int portnum = SMTP_PORT;
102 #endif /* INET6_ENABLE */
104 xalloca(parsed_host, char *, strlen(idp->id) + 1);
106 ctl->smtphost = idp->id; /* remember last host tried. */
108 strcpy(parsed_host, idp->id);
109 if ((cp = strrchr(parsed_host, '/')))
116 #endif /* INET6_ENABLE */
119 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
120 ctl->server.plugout)) == -1)
123 /* are we doing SMTP or LMTP? */
124 SMTP_setmode(ctl->listener);
126 /* first, probe for ESMTP */
127 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
128 SMTP_ehlo(ctl->smtp_socket, id_me,
129 &ctl->server.esmtp_options) == SM_OK)
133 * RFC 1869 warns that some listeners hang up on a failed EHLO,
134 * so it's safest not to assume the socket will still be good.
136 SockClose(ctl->smtp_socket);
137 ctl->smtp_socket = -1;
139 /* if opening for ESMTP failed, try SMTP */
140 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
141 ctl->server.plugout)) == -1)
144 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
145 SMTP_helo(ctl->smtp_socket, id_me) == SM_OK)
148 SockClose(ctl->smtp_socket);
149 ctl->smtp_socket = -1;
156 * RFC 1123 requires that the domain name part of the
157 * RCPT TO address be "canonicalized", that is a FQDN
158 * or MX but not a CNAME. Some listeners (like exim)
159 * enforce this. Now that we have the actual hostname,
160 * compute what we should canonicalize with.
162 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : ( ctl->smtphost ? ctl->smtphost : "localhost");
164 if (outlevel >= O_DEBUG && ctl->smtp_socket != -1)
165 report(stdout, _("forwarding to %s\n"), ctl->smtphost);
167 return(ctl->smtp_socket);
170 /* these are shared by open_sink and stuffline */
172 #ifndef HAVE_SIGACTION
173 static RETSIGTYPE (*sigchld)(int);
175 static struct sigaction sa_old;
176 #endif /* HAVE_SIGACTION */
178 int stuffline(struct query *ctl, char *buf)
179 /* ship a line to the given control block's output sink (SMTP server or MDA) */
184 /* The line may contain NUL characters. Find the last char to use
185 * -- the real line termination is the sequence "\n\0".
188 while ((last += strlen(last)) && (last[-1] != '\n'))
191 /* fix message lines that have only \n termination (for qmail) */
194 if (last - 1 == buf || last[-2] != '\r')
203 phase = FORWARDING_WAIT;
206 * SMTP byte-stuffing. We only do this if the protocol does *not*
207 * use .<CR><LF> as EOM. If it does, the server will already have
208 * decorated any . lines it sends back up.
212 if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
217 /* writing to SMTP, leave the byte-stuffing in place */;
219 else /* if (!protocol->delimited) -- not byte-stuffed already */
222 SockWrite(ctl->smtp_socket, buf, 1); /* byte-stuff it */
224 /* leave it alone */;
228 /* we may need to strip carriage returns */
233 for (sp = tp = buf; sp < last; sp++)
241 if (ctl->mda || ctl->bsmtp)
242 n = fwrite(buf, 1, last - buf, sinkfp);
243 else if (ctl->smtp_socket != -1)
244 n = SockWrite(ctl->smtp_socket, buf, last - buf);
251 static void sanitize(char *s)
252 /* replace unsafe shellchars by an _ */
254 const static char *ok_chars = " 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
257 for (cp = s; *(cp += strspn(cp, ok_chars)); /* NO INCREMENT */)
261 static int send_bouncemail(struct query *ctl, struct msgblk *msg,
262 int userclass, char *message,
263 int nerrors, char *errors[])
264 /* bounce back an error report a la RFC 1892 */
266 char daemon_name[18 + HOSTLEN] = "FETCHMAIL-DAEMON@";
267 char boundary[BUFSIZ], *ts, *bounce_to;
270 /* don't bounce in reply to undeliverable bounces */
271 if (!msg->return_path[0] || strcmp(msg->return_path, "<>") == 0)
274 bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
276 SMTP_setmode(SMTP_MODE);
278 strcat(daemon_name, fetchmailhost);
280 /* we need only SMTP for this purpose */
281 if ((sock = SockOpen("localhost", SMTP_PORT, NULL, NULL)) == -1
282 || SMTP_ok(sock) != SM_OK
283 || SMTP_helo(sock, "localhost") != SM_OK
284 || SMTP_from(sock, daemon_name, (char *)NULL) != SM_OK
285 || SMTP_rcpt(sock, bounce_to) != SM_OK
286 || SMTP_data(sock) != SM_OK)
289 /* our first duty is to keep the sacred foo counters turning... */
291 "foo-mani-padme-hum-%d-%d-%ld",
292 (int)getpid(), (int)getppid(), time((time_t *)NULL));
294 ts = rfc822timestamp();
296 if (outlevel >= O_VERBOSE)
297 report(stdout, "SMTP: (bounce-message body)\n");
299 /* this will usually go to sylog... */
300 report(stderr, "mail from %s bounced to %s\n",
301 daemon_name, bounce_to);
303 /* bouncemail headers */
304 SockPrintf(sock, "Return-Path: <>\r\n");
305 SockPrintf(sock, "From: %s\r\n", daemon_name);
306 SockPrintf(sock, "To: %s\r\n", bounce_to);
307 SockPrintf(sock, "MIME-Version: 1.0\r\n");
308 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
309 SockPrintf(sock, "\r\n");
311 /* RFC1892 part 1 -- human-readable message */
312 SockPrintf(sock, "--%s\r\n", boundary);
313 SockPrintf(sock,"Content-Type: text/plain\r\n");
314 SockPrintf(sock, "\r\n");
315 SockWrite(sock, message, strlen(message));
316 SockPrintf(sock, "\r\n");
317 SockPrintf(sock, "\r\n");
324 /* RFC1892 part 2 -- machine-readable responses */
325 SockPrintf(sock, "--%s\r\n", boundary);
326 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
327 SockPrintf(sock, "\r\n");
328 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fetchmailhost);
331 for (idp = msg->recipients; idp; idp = idp->next)
332 if (idp->val.status.mark == userclass)
335 /* Minimum RFC1894 compliance + Diagnostic-Code field */
336 SockPrintf(sock, "\r\n");
337 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n", idp->id);
338 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", ts);
339 SockPrintf(sock, "Action: failed\r\n");
342 /* one error applies to all users */
344 else if (nerrors > nusers)
346 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
350 /* errors correspond 1-1 to selected users */
351 error = errors[nusers++];
353 if (strlen(error) > 9 && isdigit(error[4])
354 && error[5] == '.' && isdigit(error[6])
355 && error[7] == '.' && isdigit(error[8]))
356 /* Enhanced status code available, use it */
357 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
359 /* Enhanced status code not available, fake one */
360 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
361 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
363 SockPrintf(sock, "\r\n");
366 /* RFC1892 part 3 -- headers of undelivered message */
367 SockPrintf(sock, "--%s\r\n", boundary);
368 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
369 SockPrintf(sock, "\r\n");
370 SockWrite(sock, msg->headers, strlen(msg->headers));
371 SockPrintf(sock, "\r\n");
372 SockPrintf(sock, "--%s--\r\n", boundary);
374 if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
382 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
383 /* handle SMTP errors based on the content of SMTP_response */
384 /* return of PS_REFUSED deletes mail from the server; PS_TRANSIENT keeps it */
386 int smtperr = atoi(smtp_response);
389 xalloca(responses[0], char *, strlen(smtp_response)+1);
390 strcpy(responses[0], smtp_response);
392 SMTP_rset(ctl->smtp_socket); /* stay on the safe site */
394 if (outlevel >= O_DEBUG)
395 report(stdout, "Saved error is still %d\n", smtperr);
398 * Note: send_bouncemail message strings are not made subject
399 * to gettext translation because (a) they're going to be
400 * embedded in a text/plain 7bit part, and (b) they're
401 * going to be associated with listener error-response
402 * messages, which are probably in English (none of the
403 * MTAs I know about are internationalized).
405 if (str_find(&ctl->antispam, smtperr))
408 * SMTP listener explicitly refuses to deliver mail
409 * coming from this address, probably due to an
410 * anti-spam domain exclusion. Respect this. Don't
411 * try to ship the message, and don't prevent it from
412 * being deleted. Default values:
414 * 571 = sendmail's "unsolicited email refused"
415 * 550 = exim's new antispam response (temporary)
416 * 501 = exim's old antispam response
417 * 554 = Postfix antispam response.
420 send_bouncemail(ctl, msg, XMIT_ACCEPT,
421 "Our spam filter rejected this transaction.\r\n",
427 * Suppress error message only if the response specifically
428 * meant `excluded for policy reasons'. We *should* see
429 * an error when the return code is less specific.
432 report(stderr, _("%cMTP error: %s\n"),
438 case 552: /* message exceeds fixed maximum message size */
440 * Permanent no-go condition on the
441 * ESMTP server. Don't try to ship the message,
442 * and allow it to be deleted.
444 send_bouncemail(ctl, msg, XMIT_ACCEPT,
445 "This message was too large (SMTP error 552).\r\n",
447 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
449 case 553: /* invalid sending domain */
451 * These latter days 553 usually means a spammer is trying to
452 * cover his tracks. We never bouncemail on these, because
453 * (a) the return address is invalid by definition, and
454 * (b) we wouldn't want spammers to get confirmation that
455 * this address is live, anyway.
457 send_bouncemail(ctl, msg, XMIT_ACCEPT,
458 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
463 /* bounce non-transient errors back to the sender */
464 if (smtperr >= 500 && smtperr <= 599)
465 if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
466 "General SMTP/ESMTP error.\r\n",
468 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
470 * We're going to end up here on 4xx errors, like:
472 * 451: temporarily unable to identify sender (exim)
473 * 452: temporary out-of-queue-space condition on the ESMTP server.
475 * These are temporary errors. Don't try to ship the message,
476 * and suppress deletion so it can be retried on a future
479 * Bouncemail *might* be appropriate here as a delay
480 * notification (note; if we ever add this, we must make
481 * sure the RFC1894 Action field is "delayed" rather thwn
482 * "failed"). But it's not really necessary because
483 * these are not actual failures, we're very likely to be
484 * able to recover on the next cycle.
486 return(PS_TRANSIENT);
490 int open_sink(struct query *ctl, struct msgblk *msg,
491 int *good_addresses, int *bad_addresses)
492 /* set up sinkfp to be an input sink we can ship a message to */
495 #ifdef HAVE_SIGACTION
496 struct sigaction sa_new;
497 #endif /* HAVE_SIGACTION */
499 *bad_addresses = *good_addresses = 0;
501 if (ctl->bsmtp) /* dump to a BSMTP batch file */
503 if (strcmp(ctl->bsmtp, "-") == 0)
506 sinkfp = fopen(ctl->bsmtp, "a");
508 /* see the ap computation under the SMTP branch */
510 "MAIL FROM: %s", (msg->return_path[0]) ? msg->return_path : user);
512 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
513 fputs(" BODY=8BITMIME", sinkfp);
514 else if (ctl->mimemsg & MSG_IS_7BIT)
515 fputs(" BODY=7BIT", sinkfp);
517 /* exim's BSMTP processor does not handle SIZE */
518 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
520 fprintf(sinkfp, "\r\n");
523 * RFC 1123 requires that the domain name part of the
524 * RCPT TO address be "canonicalized", that is a FQDN
525 * or MX but not a CNAME. Some listeners (like exim)
526 * enforce this. Now that we have the actual hostname,
527 * compute what we should canonicalize with.
529 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
532 for (idp = msg->recipients; idp; idp = idp->next)
533 if (idp->val.status.mark == XMIT_ACCEPT)
536 fprintf(sinkfp, "RCPT TO: %s\r\n", ctl->smtpname);
537 else if (strchr(idp->id, '@'))
539 "RCPT TO: %s\r\n", idp->id);
542 "RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
546 fputs("DATA\r\n", sinkfp);
550 report(stderr, _("BSMTP file open or preamble write failed\n"));
554 else if (ctl->mda) /* we have a declared MDA */
556 int length = 0, fromlen = 0, nameslen = 0;
557 char *names = NULL, *before, *after, *from = NULL;
559 ctl->destaddr = "localhost";
561 for (idp = msg->recipients; idp; idp = idp->next)
562 if (idp->val.status.mark == XMIT_ACCEPT)
565 length = strlen(ctl->mda);
566 before = xstrdup(ctl->mda);
568 /* get user addresses for %T (or %s for backward compatibility) */
569 if (strstr(before, "%s") || strstr(before, "%T"))
572 * We go through this in order to be able to handle very
573 * long lists of users and (re)implement %s.
576 for (idp = msg->recipients; idp; idp = idp->next)
577 if ((idp->val.status.mark == XMIT_ACCEPT))
578 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
579 if ((*good_addresses == 0))
580 nameslen = strlen(run.postmaster);
582 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
583 if (*good_addresses == 0)
584 strcpy(names, run.postmaster);
588 for (idp = msg->recipients; idp; idp = idp->next)
589 if (idp->val.status.mark == XMIT_ACCEPT)
591 strcat(names, idp->id);
594 names[--nameslen] = '\0'; /* chop trailing space */
597 /* sanitize names in order to contain only harmless shell chars */
601 /* get From address for %F */
602 if (strstr(before, "%F"))
604 from = xstrdup(msg->return_path);
606 /* sanitize from in order to contain *only* harmless shell chars */
609 fromlen = strlen(from);
612 /* do we have to build an mda string? */
617 /* find length of resulting mda string */
619 while ((sp = strstr(sp, "%s"))) {
620 length += nameslen - 2; /* subtract %s */
624 while ((sp = strstr(sp, "%T"))) {
625 length += nameslen - 2; /* subtract %T */
629 while ((sp = strstr(sp, "%F"))) {
630 length += fromlen - 2; /* subtract %F */
634 after = xmalloc(length + 1);
636 /* copy mda source string to after, while expanding %[sTF] */
637 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
638 if (sp[0] != '%') continue;
640 /* need to expand? BTW, no here overflow, because in
641 ** the worst case (end of string) sp[1] == '\0' */
642 if (sp[1] == 's' || sp[1] == 'T') {
645 sp++; /* position sp over [sT] */
646 dp--; /* adjust dp */
647 } else if (sp[1] == 'F') {
650 sp++; /* position sp over F */
651 dp--; /* adjust dp */
670 if (outlevel >= O_DEBUG)
671 report(stdout, _("about to deliver with: %s\n"), before);
675 * Arrange to run with user's permissions if we're root.
676 * This will initialize the ownership of any files the
677 * MDA creates properly. (The seteuid call is available
678 * under all BSDs and Linux)
681 #endif /* HAVE_SETEUID */
683 sinkfp = popen(before, "w");
688 /* this will fail quietly if we didn't start as root */
690 #endif /* HAVE_SETEUID */
694 report(stderr, _("MDA open failed\n"));
698 #ifndef HAVE_SIGACTION
699 sigchld = signal(SIGCHLD, SIG_DFL);
701 memset (&sa_new, 0, sizeof sa_new);
702 sigemptyset (&sa_new.sa_mask);
703 sa_new.sa_handler = SIG_DFL;
704 sigaction (SIGCHLD, &sa_new, &sa_old);
705 #endif /* HAVE_SIGACTION */
707 else /* forward to an SMTP or LMTP listener */
710 char options[MSGBUFSIZE];
711 char addr[HOSTLEN+USERNAMELEN+1];
712 char **from_responses;
715 /* build a connection to the SMTP listener */
716 if ((smtp_open(ctl) == -1))
718 report(stderr, _("%cMTP connect to %s failed\n"),
720 ctl->smtphost ? ctl->smtphost : "localhost");
725 * Compute ESMTP options.
728 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
729 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
730 strcpy(options, " BODY=8BITMIME");
731 else if (ctl->mimemsg & MSG_IS_7BIT)
732 strcpy(options, " BODY=7BIT");
735 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
736 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
739 * Try to get the SMTP listener to take the Return-Path
740 * address as MAIL FROM. If it won't, fall back on the
741 * remotename and mailserver host. This won't affect replies,
742 * which use the header From address anyway; the MAIL FROM
743 * address is a place for the SMTP listener to send
744 * bouncemail. The point is to guarantee a FQDN in the MAIL
745 * FROM line -- some SMTP listeners, like smail, become
748 * RFC 1123 requires that the domain name part of the
749 * MAIL FROM address be "canonicalized", that is a
750 * FQDN or MX but not a CNAME. We'll assume the Return-Path
751 * header is already in this form here (it certainly
752 * is if rewrite is on). RFC 1123 is silent on whether
753 * a nonexistent hostname part is considered canonical.
755 * This is a potential problem if the MTAs further upstream
756 * didn't pass canonicalized From/Return-Path lines, *and* the
757 * local SMTP listener insists on them.
759 if (!msg->return_path[0])
761 sprintf(addr, "%s@%s", ctl->remotename, ctl->server.truename);
764 else if (strchr(msg->return_path, '@'))
765 ap = msg->return_path;
766 else /* in case Return-Path existed but was local */
768 sprintf(addr, "%s@%s", msg->return_path, ctl->server.truename);
772 if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
773 return(handle_smtp_report(ctl, msg));
776 * Now list the recipient addressees
779 for (idp = msg->recipients; idp; idp = idp->next)
781 xalloca(from_responses, char **, sizeof(char *) * total_addresses);
782 for (idp = msg->recipients; idp; idp = idp->next)
783 if (idp->val.status.mark == XMIT_ACCEPT)
785 if (strchr(idp->id, '@'))
786 strcpy(addr, idp->id);
790 snprintf(addr, sizeof(addr)-1, "%s", ctl->smtpname);
792 sprintf(addr, "%s", ctl->smtpname);
793 #endif /* HAVE_SNPRINTF */
797 snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
799 sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
800 #endif /* HAVE_SNPRINTF */
803 if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
807 char errbuf[POPBUFSIZE];
809 strcpy(errbuf, idp->id);
810 strcat(errbuf, ": ");
811 strcat(errbuf, smtp_response);
813 xalloca(from_responses[*bad_addresses],
816 strcpy(from_responses[*bad_addresses], errbuf);
819 idp->val.status.mark = XMIT_RCPTBAD;
820 if (outlevel >= O_VERBOSE)
822 _("%cMTP listener doesn't like recipient address `%s'\n"),
823 ctl->listener, addr);
827 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
828 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
829 *bad_addresses, from_responses);
831 * It's tempting to do local notification only if bouncemail was
832 * insufficient -- that is, to add && total_addresses > *bad_addresses
833 * to the test here. The problem with this theory is that it would
834 * make initial diagnosis of a broken multidrop configuration very
835 * hard -- most single-recipient messages would just invisibly bounce.
837 if (!(*good_addresses))
839 if (strchr(run.postmaster, '@'))
840 strcpy(addr, run.postmaster);
844 snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
846 sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
847 #endif /* HAVE_SNPRINTF */
850 if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
852 report(stderr, _("can't even send to %s!\n"), run.postmaster);
853 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
857 if (outlevel >= O_VERBOSE)
858 report(stderr, _("no address matches; forwarding to %s.\n"), run.postmaster);
862 * Tell the listener we're ready to send data.
863 * Some listeners (like zmailer) may return antispam errors here.
865 if (SMTP_data(ctl->smtp_socket) != SM_OK)
866 return(handle_smtp_report(ctl, msg));
870 * We need to stash this away in order to know how many
871 * response lines to expect after the LMTP end-of-message.
873 lmtp_responses = *good_addresses;
878 void release_sink(struct query *ctl)
879 /* release the per-message output sink, whether it's a pipe or SMTP socket */
888 sinkfp = (FILE *)NULL;
890 #ifndef HAVE_SIGACTION
891 signal(SIGCHLD, sigchld);
893 sigaction (SIGCHLD, &sa_old, NULL);
894 #endif /* HAVE_SIGACTION */
898 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
899 /* perform end-of-message actions on the current output sink */
905 /* close the delivery pipe, we'll reopen before next message */
909 sinkfp = (FILE *)NULL;
913 #ifndef HAVE_SIGACTION
914 signal(SIGCHLD, sigchld);
916 sigaction (SIGCHLD, &sa_old, NULL);
917 #endif /* HAVE_SIGACTION */
921 _("MDA exited abnormally or returned nonzero status\n"));
929 /* implicit disk-full check here... */
930 fputs(".\r\n", sinkfp);
931 error = ferror(sinkfp);
932 if (strcmp(ctl->bsmtp, "-"))
933 if (fclose(sinkfp) == EOF) error = 1;
937 _("Message termination or close of BSMTP file failed\n"));
943 /* write message terminator */
944 if (SMTP_eom(ctl->smtp_socket) != SM_OK)
946 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
950 report(stderr, _("SMTP listener refused delivery\n"));
956 * If this is an SMTP connection, SMTP_eom() ate the response.
957 * But could be this is an LMTP connection, in which case we have to
958 * interpret either (a) a single 503 response meaning there
959 * were no successful RCPT TOs, or (b) a variable number of
960 * responses, one for each successful RCPT TO. We need to send
961 * bouncemail on each failed response and then return TRUE anyway,
962 * otherwise the message will get left in the queue and resent
963 * to people who got it the first time.
965 if (ctl->listener == LMTP_MODE)
967 if (lmtp_responses == 0)
969 SMTP_ok(ctl->smtp_socket);
972 * According to RFC2033, 503 is the only legal response
973 * if no RCPT TO commands succeeded. No error recovery
974 * is really possible here, as we have no idea what
975 * insane thing the listener might be doing if it doesn't
978 if (atoi(smtp_response) == 503)
979 report(stderr, _("LMTP delivery error on EOM\n"));
982 _("Unexpected non-503 response to LMTP EOM: %s\n"),
986 * It's not completely clear what to do here. We choose to
987 * interpret delivery failure here as a transient error,
988 * the same way SMTP delivery failure is handled. If we're
989 * wrong, an undead message will get stuck in the queue.
998 /* eat the RFC2033-required responses, saving errors */
999 xalloca(responses, char **, sizeof(char *) * lmtp_responses);
1000 for (errors = i = 0; i < lmtp_responses; i++)
1002 if (SMTP_ok(ctl->smtp_socket) == SM_OK)
1003 responses[i] = (char *)NULL;
1006 xalloca(responses[errors],
1008 strlen(smtp_response)+1);
1009 strcpy(responses[errors], smtp_response);
1015 return(TRUE); /* all deliveries succeeded */
1018 * One or more deliveries failed.
1019 * If we can bounce a failures list back to the
1020 * sender, and the postmaster does not want to
1021 * deal with the bounces return TRUE, deleting the
1022 * message from the server so it won't be
1023 * re-forwarded on subsequent poll cycles.
1025 return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
1026 "LSMTP partial delivery failure.\r\n",
1027 errors, responses));
1035 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
1036 /* set up output sink for a mailed warning to calling user */
1041 * Dispatching warning email is a little complicated. The problem is
1042 * that we have to deal with three distinct cases:
1044 * 1. Single-drop running from user account. Warning mail should
1045 * go to the local name for which we're collecting (coincides
1046 * with calling user).
1048 * 2. Single-drop running from root or other privileged ID, with rc
1049 * file generated on the fly (Ken Estes's weird setup...) Mail
1050 * should go to the local name for which we're collecting (does not
1051 * coincide with calling user).
1053 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1054 * member null so this message will fall through to run.postmaster.
1056 * The zero in the reallen element means we won't pass a SIZE
1057 * option to ESMTP; the message length would be more trouble than
1058 * it's worth to compute.
1060 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
1062 strcat(reply.return_path, fetchmailhost);
1064 if (!MULTIDROP(ctl)) /* send to calling user */
1068 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1069 status = open_sink(ctl, &reply, &good, &bad);
1070 free_str_list(&reply.recipients);
1073 else /* send to postmaster */
1074 return(open_sink(ctl, &reply, &good, &bad));
1077 #if defined(HAVE_STDARG_H)
1078 void stuff_warning(struct query *ctl, const char *fmt, ... )
1080 void stuff_warning(struct query *ctl, fmt, va_alist)
1082 const char *fmt; /* printf-style format */
1085 /* format and ship a warning message line by mail */
1087 char buf[POPBUFSIZE];
1091 * stuffline() requires its input to be writeable (for CR stripping),
1092 * so we needed to copy the message to a writeable buffer anyway in
1093 * case it was a string constant. We make a virtue of that necessity
1094 * here by supporting stdargs/varargs.
1096 #if defined(HAVE_STDARG_H)
1101 #ifdef HAVE_VSNPRINTF
1102 vsnprintf(buf, sizeof(buf), fmt, ap);
1104 vsprintf(buf, fmt, ap);
1108 strcat(buf, "\r\n");
1110 stuffline(ctl, buf);
1113 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1114 /* sign and send mailed warnings */
1116 stuff_warning(ctl, "--\r\n\t\t\t\tThe Fetchmail Daemon\r\n");
1117 close_sink(ctl, msg, TRUE);
1120 /* sink.c ends here */