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. */
107 if(ctl->smtphost[0]=='/')
108 ctl->listener = LMTP_MODE;
110 strcpy(parsed_host, idp->id);
111 if ((cp = strrchr(parsed_host, '/')))
118 #endif /* INET6_ENABLE */
121 if (ctl->smtphost[0]=='/'){
122 if((ctl->smtp_socket = UnixOpen(ctl->smtphost))==-1)
125 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
126 ctl->server.plugout)) == -1)
129 /* are we doing SMTP or LMTP? */
130 SMTP_setmode(ctl->listener);
132 /* first, probe for ESMTP */
133 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
134 SMTP_ehlo(ctl->smtp_socket, id_me,
135 &ctl->server.esmtp_options) == SM_OK)
139 * RFC 1869 warns that some listeners hang up on a failed EHLO,
140 * so it's safest not to assume the socket will still be good.
142 SockClose(ctl->smtp_socket);
143 ctl->smtp_socket = -1;
145 /* if opening for ESMTP failed, try SMTP */
146 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
147 ctl->server.plugout)) == -1)
150 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
151 SMTP_helo(ctl->smtp_socket, id_me) == SM_OK)
154 SockClose(ctl->smtp_socket);
155 ctl->smtp_socket = -1;
162 * RFC 1123 requires that the domain name part of the
163 * RCPT TO address be "canonicalized", that is a FQDN
164 * or MX but not a CNAME. Some listeners (like exim)
165 * enforce this. Now that we have the actual hostname,
166 * compute what we should canonicalize with.
168 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : ( ctl->smtphost && ctl->smtphost[0] != '/' ? ctl->smtphost : "localhost");
170 if (outlevel >= O_DEBUG && ctl->smtp_socket != -1)
171 report(stdout, _("forwarding to %s\n"), ctl->smtphost);
173 return(ctl->smtp_socket);
176 /* these are shared by open_sink and stuffline */
178 #ifndef HAVE_SIGACTION
179 static RETSIGTYPE (*sigchld)(int);
181 static struct sigaction sa_old;
182 #endif /* HAVE_SIGACTION */
184 int stuffline(struct query *ctl, char *buf)
185 /* ship a line to the given control block's output sink (SMTP server or MDA) */
190 /* The line may contain NUL characters. Find the last char to use
191 * -- the real line termination is the sequence "\n\0".
194 while ((last += strlen(last)) && (last[-1] != '\n'))
197 /* fix message lines that have only \n termination (for qmail) */
200 if (last - 1 == buf || last[-2] != '\r')
209 phase = FORWARDING_WAIT;
212 * SMTP byte-stuffing. We only do this if the protocol does *not*
213 * use .<CR><LF> as EOM. If it does, the server will already have
214 * decorated any . lines it sends back up.
218 if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
223 /* writing to SMTP, leave the byte-stuffing in place */;
225 else /* if (!protocol->delimited) -- not byte-stuffed already */
228 SockWrite(ctl->smtp_socket, buf, 1); /* byte-stuff it */
230 /* leave it alone */;
234 /* we may need to strip carriage returns */
239 for (sp = tp = buf; sp < last; sp++)
247 if (ctl->mda || ctl->bsmtp)
248 n = fwrite(buf, 1, last - buf, sinkfp);
249 else if (ctl->smtp_socket != -1)
250 n = SockWrite(ctl->smtp_socket, buf, last - buf);
257 static void sanitize(char *s)
258 /* replace unsafe shellchars by an _ */
260 const static char *ok_chars = " 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
263 for (cp = s; *(cp += strspn(cp, ok_chars)); /* NO INCREMENT */)
267 static int send_bouncemail(struct query *ctl, struct msgblk *msg,
268 int userclass, char *message,
269 int nerrors, char *errors[])
270 /* bounce back an error report a la RFC 1892 */
272 char daemon_name[18 + HOSTLEN] = "FETCHMAIL-DAEMON@";
273 char boundary[BUFSIZ], *bounce_to;
276 /* don't bounce in reply to undeliverable bounces */
277 if (!msg->return_path[0] || strcmp(msg->return_path, "<>") == 0)
280 bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
282 SMTP_setmode(SMTP_MODE);
284 strcat(daemon_name, fetchmailhost);
286 /* we need only SMTP for this purpose */
287 if ((sock = SockOpen("localhost", SMTP_PORT, NULL, NULL)) == -1
288 || SMTP_ok(sock) != SM_OK
289 || SMTP_helo(sock, "localhost") != SM_OK
290 || SMTP_from(sock, daemon_name, (char *)NULL) != SM_OK
291 || SMTP_rcpt(sock, bounce_to) != SM_OK
292 || SMTP_data(sock) != SM_OK)
295 /* our first duty is to keep the sacred foo counters turning... */
297 "foo-mani-padme-hum-%d-%d-%ld",
298 (int)getpid(), (int)getppid(), time((time_t *)NULL));
300 if (outlevel >= O_VERBOSE)
301 report(stdout, _("SMTP: (bounce-message body)\n"));
303 /* this will usually go to sylog... */
304 report(stderr, _("mail from %s bounced to %s\n"),
305 daemon_name, bounce_to);
307 /* bouncemail headers */
308 SockPrintf(sock, "Return-Path: <>\r\n");
309 SockPrintf(sock, "From: %s\r\n", daemon_name);
310 SockPrintf(sock, "To: %s\r\n", bounce_to);
311 SockPrintf(sock, "MIME-Version: 1.0\r\n");
312 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
313 SockPrintf(sock, "\r\n");
315 /* RFC1892 part 1 -- human-readable message */
316 SockPrintf(sock, "--%s\r\n", boundary);
317 SockPrintf(sock,"Content-Type: text/plain\r\n");
318 SockPrintf(sock, "\r\n");
319 SockWrite(sock, message, strlen(message));
320 SockPrintf(sock, "\r\n");
321 SockPrintf(sock, "\r\n");
328 /* RFC1892 part 2 -- machine-readable responses */
329 SockPrintf(sock, "--%s\r\n", boundary);
330 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
331 SockPrintf(sock, "\r\n");
332 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fetchmailhost);
335 for (idp = msg->recipients; idp; idp = idp->next)
336 if (idp->val.status.mark == userclass)
339 /* Minimum RFC1894 compliance + Diagnostic-Code field */
340 SockPrintf(sock, "\r\n");
341 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n", idp->id);
342 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", rfc822timestamp());
343 SockPrintf(sock, "Action: failed\r\n");
346 /* one error applies to all users */
348 else if (nerrors > nusers)
350 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
354 /* errors correspond 1-1 to selected users */
355 error = errors[nusers++];
357 if (strlen(error) > 9 && isdigit(error[4])
358 && error[5] == '.' && isdigit(error[6])
359 && error[7] == '.' && isdigit(error[8]))
360 /* Enhanced status code available, use it */
361 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
363 /* Enhanced status code not available, fake one */
364 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
365 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
367 SockPrintf(sock, "\r\n");
370 /* RFC1892 part 3 -- headers of undelivered message */
371 SockPrintf(sock, "--%s\r\n", boundary);
372 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
373 SockPrintf(sock, "\r\n");
374 SockWrite(sock, msg->headers, strlen(msg->headers));
375 SockPrintf(sock, "\r\n");
376 SockPrintf(sock, "--%s--\r\n", boundary);
378 if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
386 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
387 /* handle SMTP errors based on the content of SMTP_response */
388 /* return of PS_REFUSED deletes mail from the server; PS_TRANSIENT keeps it */
390 int smtperr = atoi(smtp_response);
393 xalloca(responses[0], char *, strlen(smtp_response)+1);
394 strcpy(responses[0], smtp_response);
396 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
398 if (outlevel >= O_DEBUG)
399 report(stdout, _("Saved error is still %d\n"), smtperr);
402 * Note: send_bouncemail message strings are not made subject
403 * to gettext translation because (a) they're going to be
404 * embedded in a text/plain 7bit part, and (b) they're
405 * going to be associated with listener error-response
406 * messages, which are probably in English (none of the
407 * MTAs I know about are internationalized).
409 if (str_find(&ctl->antispam, smtperr))
412 * SMTP listener explicitly refuses to deliver mail
413 * coming from this address, probably due to an
414 * anti-spam domain exclusion. Respect this. Don't
415 * try to ship the message, and don't prevent it from
416 * being deleted. There's no point in bouncing the
417 * email either since most spammers don't put their
418 * real return email address anywhere in the headers
419 * (unless the user insists with the SET SPAMBOUNCE
424 * 571 = sendmail's "unsolicited email refused"
425 * 550 = exim's new antispam response (temporary)
426 * 501 = exim's old antispam response
427 * 554 = Postfix antispam response.
431 send_bouncemail(ctl, msg, XMIT_ACCEPT,
432 "Our spam filter rejected this transaction.\r\n",
438 * Suppress error message only if the response specifically
439 * meant `excluded for policy reasons'. We *should* see
440 * an error when the return code is less specific.
443 report(stderr, _("%cMTP error: %s\n"),
449 case 552: /* message exceeds fixed maximum message size */
451 * Permanent no-go condition on the
452 * ESMTP server. Don't try to ship the message,
453 * and allow it to be deleted.
455 send_bouncemail(ctl, msg, XMIT_ACCEPT,
456 "This message was too large (SMTP error 552).\r\n",
458 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
460 case 553: /* invalid sending domain */
462 * These latter days 553 usually means a spammer is trying to
463 * cover his tracks. We never bouncemail on these, because
464 * (a) the return address is invalid by definition, and
465 * (b) we wouldn't want spammers to get confirmation that
466 * this address is live, anyway.
468 send_bouncemail(ctl, msg, XMIT_ACCEPT,
469 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
474 /* bounce non-transient errors back to the sender */
475 if (smtperr >= 500 && smtperr <= 599)
476 if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
477 "General SMTP/ESMTP error.\r\n",
479 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
481 * We're going to end up here on 4xx errors, like:
483 * 451: temporarily unable to identify sender (exim)
484 * 452: temporary out-of-queue-space condition on the ESMTP server.
486 * These are temporary errors. Don't try to ship the message,
487 * and suppress deletion so it can be retried on a future
490 * Bouncemail *might* be appropriate here as a delay
491 * notification (note; if we ever add this, we must make
492 * sure the RFC1894 Action field is "delayed" rather thwn
493 * "failed"). But it's not really necessary because
494 * these are not actual failures, we're very likely to be
495 * able to recover on the next cycle.
497 return(PS_TRANSIENT);
501 int open_sink(struct query *ctl, struct msgblk *msg,
502 int *good_addresses, int *bad_addresses)
503 /* set up sinkfp to be an input sink we can ship a message to */
506 #ifdef HAVE_SIGACTION
507 struct sigaction sa_new;
508 #endif /* HAVE_SIGACTION */
510 *bad_addresses = *good_addresses = 0;
512 if (ctl->bsmtp) /* dump to a BSMTP batch file */
514 if (strcmp(ctl->bsmtp, "-") == 0)
517 sinkfp = fopen(ctl->bsmtp, "a");
519 /* see the ap computation under the SMTP branch */
521 "MAIL FROM: %s", (msg->return_path[0]) ? msg->return_path : user);
523 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
524 fputs(" BODY=8BITMIME", sinkfp);
525 else if (ctl->mimemsg & MSG_IS_7BIT)
526 fputs(" BODY=7BIT", sinkfp);
528 /* exim's BSMTP processor does not handle SIZE */
529 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
531 fprintf(sinkfp, "\r\n");
534 * RFC 1123 requires that the domain name part of the
535 * RCPT TO address be "canonicalized", that is a FQDN
536 * or MX but not a CNAME. Some listeners (like exim)
537 * enforce this. Now that we have the actual hostname,
538 * compute what we should canonicalize with.
540 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
543 for (idp = msg->recipients; idp; idp = idp->next)
544 if (idp->val.status.mark == XMIT_ACCEPT)
547 fprintf(sinkfp, "RCPT TO: %s\r\n", ctl->smtpname);
548 else if (strchr(idp->id, '@'))
550 "RCPT TO: %s\r\n", idp->id);
553 "RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
557 fputs("DATA\r\n", sinkfp);
561 report(stderr, _("BSMTP file open or preamble write failed\n"));
567 * Try to forward to an SMTP or LMTP listener. If the attempt to
568 * open a socket fails, fall through to attempt delivery via
571 else if (!ctl->mda && smtp_open(ctl) != -1)
574 char options[MSGBUFSIZE];
575 char addr[HOSTLEN+USERNAMELEN+1];
576 char **from_responses;
580 * Compute ESMTP options.
583 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
584 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
585 strcpy(options, " BODY=8BITMIME");
586 else if (ctl->mimemsg & MSG_IS_7BIT)
587 strcpy(options, " BODY=7BIT");
590 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
591 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
594 * Try to get the SMTP listener to take the Return-Path
595 * address as MAIL FROM. If it won't, fall back on the
596 * remotename and mailserver host. This won't affect replies,
597 * which use the header From address anyway; the MAIL FROM
598 * address is a place for the SMTP listener to send
599 * bouncemail. The point is to guarantee a FQDN in the MAIL
600 * FROM line -- some SMTP listeners, like smail, become
603 * RFC 1123 requires that the domain name part of the
604 * MAIL FROM address be "canonicalized", that is a
605 * FQDN or MX but not a CNAME. We'll assume the Return-Path
606 * header is already in this form here (it certainly
607 * is if rewrite is on). RFC 1123 is silent on whether
608 * a nonexistent hostname part is considered canonical.
610 * This is a potential problem if the MTAs further upstream
611 * didn't pass canonicalized From/Return-Path lines, *and* the
612 * local SMTP listener insists on them.
614 if (!msg->return_path[0])
616 sprintf(addr, "%s@%s", ctl->remotename, ctl->server.truename);
619 else if (strchr(msg->return_path, '@'))
620 ap = msg->return_path;
621 else /* in case Return-Path existed but was local */
623 sprintf(addr, "%s@%s", msg->return_path, ctl->server.truename);
627 if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
628 return(handle_smtp_report(ctl, msg));
631 * Now list the recipient addressees
634 for (idp = msg->recipients; idp; idp = idp->next)
636 xalloca(from_responses, char **, sizeof(char *) * total_addresses);
637 for (idp = msg->recipients; idp; idp = idp->next)
638 if (idp->val.status.mark == XMIT_ACCEPT)
640 if (strchr(idp->id, '@'))
641 strcpy(addr, idp->id);
645 snprintf(addr, sizeof(addr)-1, "%s", ctl->smtpname);
647 sprintf(addr, "%s", ctl->smtpname);
648 #endif /* HAVE_SNPRINTF */
652 snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
654 sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
655 #endif /* HAVE_SNPRINTF */
658 if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
662 char errbuf[POPBUFSIZE];
667 * I don't remember how this got in here, but it doesn't
668 * work. The obvious symptom is that no bounce message
669 * is sent for a nonexistent user. Less obviously
670 * Forwarding to postmaster also does not work. The body is
673 * If a mail is sent to one valid and one invalid
674 * user, the mail does not go to the valid user
675 * also as the body is discarded after calling
678 if ((res = handle_smtp_report(ctl, msg))==PS_REFUSED)
680 #endif /* __UNUSED__ */
682 strcpy(errbuf, idp->id);
683 strcat(errbuf, ": ");
684 strcat(errbuf, smtp_response);
686 xalloca(from_responses[*bad_addresses],
689 strcpy(from_responses[*bad_addresses], errbuf);
692 idp->val.status.mark = XMIT_RCPTBAD;
693 if (outlevel >= O_VERBOSE)
695 _("%cMTP listener doesn't like recipient address `%s'\n"),
696 ctl->listener, addr);
700 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
701 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
702 *bad_addresses, from_responses);
704 * It's tempting to do local notification only if bouncemail was
705 * insufficient -- that is, to add && total_addresses > *bad_addresses
706 * to the test here. The problem with this theory is that it would
707 * make initial diagnosis of a broken multidrop configuration very
708 * hard -- most single-recipient messages would just invisibly bounce.
710 if (!(*good_addresses))
712 if (strchr(run.postmaster, '@'))
713 strcpy(addr, run.postmaster);
717 snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
719 sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
720 #endif /* HAVE_SNPRINTF */
723 if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
725 report(stderr, _("can't even send to %s!\n"), run.postmaster);
726 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
730 if (outlevel >= O_VERBOSE)
731 report(stderr, _("no address matches; forwarding to %s.\n"), run.postmaster);
735 * Tell the listener we're ready to send data.
736 * Some listeners (like zmailer) may return antispam errors here.
738 if (SMTP_data(ctl->smtp_socket) != SM_OK)
739 return(handle_smtp_report(ctl, msg));
743 * Awkward case. User didn't specify an MDA. Our attempt to get a
744 * listener socket failed. Try to cope anyway -- initial configuration
745 * may have found procmail.
749 report(stderr, _("%cMTP connect to %s failed\n"),
751 ctl->smtphost ? ctl->smtphost : "localhost");
754 /* No fallback MDA declared. Bail out. */
758 * If user had things set up to forward offsite, no way
759 * we want to deliver locally!
761 if (ctl->smtphost && strcmp(ctl->smtphost, "localhost"))
765 * User was delivering locally. We have a fallback MDA.
766 * Latch it in place, logging the error, and fall through.
768 ctl->mda = FALLBACK_MDA;
770 report(stderr, _("can't raise the listener; falling back to %s",
775 if (ctl->mda) /* must deliver through an MDA */
777 int length = 0, fromlen = 0, nameslen = 0;
778 char *names = NULL, *before, *after, *from = NULL;
780 ctl->destaddr = "localhost";
782 for (idp = msg->recipients; idp; idp = idp->next)
783 if (idp->val.status.mark == XMIT_ACCEPT)
786 length = strlen(ctl->mda);
787 before = xstrdup(ctl->mda);
789 /* get user addresses for %T (or %s for backward compatibility) */
790 if (strstr(before, "%s") || strstr(before, "%T"))
793 * We go through this in order to be able to handle very
794 * long lists of users and (re)implement %s.
797 for (idp = msg->recipients; idp; idp = idp->next)
798 if ((idp->val.status.mark == XMIT_ACCEPT))
799 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
800 if ((*good_addresses == 0))
801 nameslen = strlen(run.postmaster);
803 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
804 if (*good_addresses == 0)
805 strcpy(names, run.postmaster);
809 for (idp = msg->recipients; idp; idp = idp->next)
810 if (idp->val.status.mark == XMIT_ACCEPT)
812 strcat(names, idp->id);
815 names[--nameslen] = '\0'; /* chop trailing space */
818 /* sanitize names in order to contain only harmless shell chars */
822 /* get From address for %F */
823 if (strstr(before, "%F"))
825 from = xstrdup(msg->return_path);
827 /* sanitize from in order to contain *only* harmless shell chars */
830 fromlen = strlen(from);
833 /* do we have to build an mda string? */
838 /* find length of resulting mda string */
840 while ((sp = strstr(sp, "%s"))) {
841 length += nameslen - 2; /* subtract %s */
845 while ((sp = strstr(sp, "%T"))) {
846 length += nameslen - 2; /* subtract %T */
850 while ((sp = strstr(sp, "%F"))) {
851 length += fromlen - 2; /* subtract %F */
855 after = xmalloc(length + 1);
857 /* copy mda source string to after, while expanding %[sTF] */
858 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
859 if (sp[0] != '%') continue;
861 /* need to expand? BTW, no here overflow, because in
862 ** the worst case (end of string) sp[1] == '\0' */
863 if (sp[1] == 's' || sp[1] == 'T') {
866 sp++; /* position sp over [sT] */
867 dp--; /* adjust dp */
868 } else if (sp[1] == 'F') {
871 sp++; /* position sp over F */
872 dp--; /* adjust dp */
891 if (outlevel >= O_DEBUG)
892 report(stdout, _("about to deliver with: %s\n"), before);
896 * Arrange to run with user's permissions if we're root.
897 * This will initialize the ownership of any files the
898 * MDA creates properly. (The seteuid call is available
899 * under all BSDs and Linux)
902 #endif /* HAVE_SETEUID */
904 sinkfp = popen(before, "w");
909 /* this will fail quietly if we didn't start as root */
911 #endif /* HAVE_SETEUID */
915 report(stderr, _("MDA open failed\n"));
919 #ifndef HAVE_SIGACTION
920 sigchld = signal(SIGCHLD, SIG_DFL);
922 memset (&sa_new, 0, sizeof sa_new);
923 sigemptyset (&sa_new.sa_mask);
924 sa_new.sa_handler = SIG_DFL;
925 sigaction (SIGCHLD, &sa_new, &sa_old);
926 #endif /* HAVE_SIGACTION */
930 * We need to stash this away in order to know how many
931 * response lines to expect after the LMTP end-of-message.
933 lmtp_responses = *good_addresses;
938 void release_sink(struct query *ctl)
939 /* release the per-message output sink, whether it's a pipe or SMTP socket */
948 sinkfp = (FILE *)NULL;
950 #ifndef HAVE_SIGACTION
951 signal(SIGCHLD, sigchld);
953 sigaction (SIGCHLD, &sa_old, NULL);
954 #endif /* HAVE_SIGACTION */
959 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
960 /* perform end-of-message actions on the current output sink */
966 /* close the delivery pipe, we'll reopen before next message */
970 sinkfp = (FILE *)NULL;
974 #ifndef HAVE_SIGACTION
975 signal(SIGCHLD, sigchld);
977 sigaction (SIGCHLD, &sa_old, NULL);
978 #endif /* HAVE_SIGACTION */
983 _("MDA exited abnormally or returned nonzero status\n"));
991 /* implicit disk-full check here... */
992 fputs(".\r\n", sinkfp);
993 error = ferror(sinkfp);
994 if (strcmp(ctl->bsmtp, "-"))
995 if (fclose(sinkfp) == EOF) error = 1;
999 _("Message termination or close of BSMTP file failed\n"));
1005 /* write message terminator */
1006 if (SMTP_eom(ctl->smtp_socket) != SM_OK)
1008 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
1012 report(stderr, _("SMTP listener refused delivery\n"));
1018 * If this is an SMTP connection, SMTP_eom() ate the response.
1019 * But could be this is an LMTP connection, in which case we have to
1020 * interpret either (a) a single 503 response meaning there
1021 * were no successful RCPT TOs, or (b) a variable number of
1022 * responses, one for each successful RCPT TO. We need to send
1023 * bouncemail on each failed response and then return TRUE anyway,
1024 * otherwise the message will get left in the queue and resent
1025 * to people who got it the first time.
1027 if (ctl->listener == LMTP_MODE)
1029 if (lmtp_responses == 0)
1031 SMTP_ok(ctl->smtp_socket);
1034 * According to RFC2033, 503 is the only legal response
1035 * if no RCPT TO commands succeeded. No error recovery
1036 * is really possible here, as we have no idea what
1037 * insane thing the listener might be doing if it doesn't
1040 if (atoi(smtp_response) == 503)
1041 report(stderr, _("LMTP delivery error on EOM\n"));
1044 _("Unexpected non-503 response to LMTP EOM: %s\n"),
1048 * It's not completely clear what to do here. We choose to
1049 * interpret delivery failure here as a transient error,
1050 * the same way SMTP delivery failure is handled. If we're
1051 * wrong, an undead message will get stuck in the queue.
1060 /* eat the RFC2033-required responses, saving errors */
1061 xalloca(responses, char **, sizeof(char *) * lmtp_responses);
1062 for (errors = i = 0; i < lmtp_responses; i++)
1064 if (SMTP_ok(ctl->smtp_socket) == SM_OK)
1065 responses[i] = (char *)NULL;
1068 xalloca(responses[errors],
1070 strlen(smtp_response)+1);
1071 strcpy(responses[errors], smtp_response);
1077 return(TRUE); /* all deliveries succeeded */
1080 * One or more deliveries failed.
1081 * If we can bounce a failures list back to the
1082 * sender, and the postmaster does not want to
1083 * deal with the bounces return TRUE, deleting the
1084 * message from the server so it won't be
1085 * re-forwarded on subsequent poll cycles.
1087 return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
1088 "LSMTP partial delivery failure.\r\n",
1089 errors, responses));
1097 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
1098 /* set up output sink for a mailed warning to calling user */
1103 * Dispatching warning email is a little complicated. The problem is
1104 * that we have to deal with three distinct cases:
1106 * 1. Single-drop running from user account. Warning mail should
1107 * go to the local name for which we're collecting (coincides
1108 * with calling user).
1110 * 2. Single-drop running from root or other privileged ID, with rc
1111 * file generated on the fly (Ken Estes's weird setup...) Mail
1112 * should go to the local name for which we're collecting (does not
1113 * coincide with calling user).
1115 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1116 * member null so this message will fall through to run.postmaster.
1118 * The zero in the reallen element means we won't pass a SIZE
1119 * option to ESMTP; the message length would be more trouble than
1120 * it's worth to compute.
1122 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
1124 strcat(reply.return_path, fetchmailhost);
1126 if (!MULTIDROP(ctl)) /* send to calling user */
1130 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1131 status = open_sink(ctl, &reply, &good, &bad);
1132 free_str_list(&reply.recipients);
1135 else /* send to postmaster */
1136 return(open_sink(ctl, &reply, &good, &bad));
1139 #if defined(HAVE_STDARG_H)
1140 void stuff_warning(struct query *ctl, const char *fmt, ... )
1142 void stuff_warning(struct query *ctl, fmt, va_alist)
1144 const char *fmt; /* printf-style format */
1147 /* format and ship a warning message line by mail */
1149 char buf[POPBUFSIZE];
1153 * stuffline() requires its input to be writeable (for CR stripping),
1154 * so we needed to copy the message to a writeable buffer anyway in
1155 * case it was a string constant. We make a virtue of that necessity
1156 * here by supporting stdargs/varargs.
1158 #if defined(HAVE_STDARG_H)
1163 #ifdef HAVE_VSNPRINTF
1164 vsnprintf(buf, sizeof(buf), fmt, ap);
1166 vsprintf(buf, fmt, ap);
1170 strcat(buf, "\r\n");
1172 stuffline(ctl, buf);
1175 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1176 /* sign and send mailed warnings */
1178 stuff_warning(ctl, _("--\r\n\t\t\t\tThe Fetchmail Daemon\r\n"));
1179 close_sink(ctl, msg, TRUE);
1182 /* sink.c ends here */