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 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 snprintf(boundary, sizeof(boundary),
300 #endif /* HAVE_SNPRINTF */
301 "foo-mani-padme-hum-%d-%d-%ld",
302 (int)getpid(), (int)getppid(), time((time_t *)NULL));
304 if (outlevel >= O_VERBOSE)
305 report(stdout, _("SMTP: (bounce-message body)\n"));
307 /* this will usually go to sylog... */
308 report(stderr, _("mail from %s bounced to %s\n"),
309 daemon_name, bounce_to);
311 /* bouncemail headers */
312 SockPrintf(sock, "Return-Path: <>\r\n");
313 SockPrintf(sock, "From: %s\r\n", daemon_name);
314 SockPrintf(sock, "To: %s\r\n", bounce_to);
315 SockPrintf(sock, "MIME-Version: 1.0\r\n");
316 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
317 SockPrintf(sock, "\r\n");
319 /* RFC1892 part 1 -- human-readable message */
320 SockPrintf(sock, "--%s\r\n", boundary);
321 SockPrintf(sock,"Content-Type: text/plain\r\n");
322 SockPrintf(sock, "\r\n");
323 SockWrite(sock, message, strlen(message));
324 SockPrintf(sock, "\r\n");
325 SockPrintf(sock, "\r\n");
332 /* RFC1892 part 2 -- machine-readable responses */
333 SockPrintf(sock, "--%s\r\n", boundary);
334 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
335 SockPrintf(sock, "\r\n");
336 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fetchmailhost);
339 for (idp = msg->recipients; idp; idp = idp->next)
340 if (idp->val.status.mark == userclass)
343 /* Minimum RFC1894 compliance + Diagnostic-Code field */
344 SockPrintf(sock, "\r\n");
345 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n", idp->id);
346 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", rfc822timestamp());
347 SockPrintf(sock, "Action: failed\r\n");
350 /* one error applies to all users */
352 else if (nerrors > nusers)
354 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
358 /* errors correspond 1-1 to selected users */
359 error = errors[nusers++];
361 if (strlen(error) > 9 && isdigit(error[4])
362 && error[5] == '.' && isdigit(error[6])
363 && error[7] == '.' && isdigit(error[8]))
364 /* Enhanced status code available, use it */
365 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
367 /* Enhanced status code not available, fake one */
368 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
369 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
371 SockPrintf(sock, "\r\n");
374 /* RFC1892 part 3 -- headers of undelivered message */
375 SockPrintf(sock, "--%s\r\n", boundary);
376 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
377 SockPrintf(sock, "\r\n");
378 SockWrite(sock, msg->headers, strlen(msg->headers));
379 SockPrintf(sock, "\r\n");
380 SockPrintf(sock, "--%s--\r\n", boundary);
382 if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
390 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
391 /* handle SMTP errors based on the content of SMTP_response */
392 /* return of PS_REFUSED deletes mail from the server; PS_TRANSIENT keeps it */
394 int smtperr = atoi(smtp_response);
397 xalloca(responses[0], char *, strlen(smtp_response)+1);
398 strcpy(responses[0], smtp_response);
400 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
402 if (outlevel >= O_DEBUG)
403 report(stdout, _("Saved error is still %d\n"), smtperr);
406 * Note: send_bouncemail message strings are not made subject
407 * to gettext translation because (a) they're going to be
408 * embedded in a text/plain 7bit part, and (b) they're
409 * going to be associated with listener error-response
410 * messages, which are probably in English (none of the
411 * MTAs I know about are internationalized).
413 if (str_find(&ctl->antispam, smtperr))
416 * SMTP listener explicitly refuses to deliver mail
417 * coming from this address, probably due to an
418 * anti-spam domain exclusion. Respect this. Don't
419 * try to ship the message, and don't prevent it from
420 * being deleted. There's no point in bouncing the
421 * email either since most spammers don't put their
422 * real return email address anywhere in the headers
423 * (unless the user insists with the SET SPAMBOUNCE
428 * 571 = sendmail's "unsolicited email refused"
429 * 550 = exim's new antispam response (temporary)
430 * 501 = exim's old antispam response
431 * 554 = Postfix antispam response.
435 send_bouncemail(ctl, msg, XMIT_ACCEPT,
436 "Our spam filter rejected this transaction.\r\n",
442 * Suppress error message only if the response specifically
443 * meant `excluded for policy reasons'. We *should* see
444 * an error when the return code is less specific.
447 report(stderr, _("%cMTP error: %s\n"),
453 case 552: /* message exceeds fixed maximum message size */
455 * Permanent no-go condition on the
456 * ESMTP server. Don't try to ship the message,
457 * and allow it to be deleted.
459 send_bouncemail(ctl, msg, XMIT_ACCEPT,
460 "This message was too large (SMTP error 552).\r\n",
462 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
464 case 553: /* invalid sending domain */
466 * These latter days 553 usually means a spammer is trying to
467 * cover his tracks. We never bouncemail on these, because
468 * (a) the return address is invalid by definition, and
469 * (b) we wouldn't want spammers to get confirmation that
470 * this address is live, anyway.
472 send_bouncemail(ctl, msg, XMIT_ACCEPT,
473 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
478 /* bounce non-transient errors back to the sender */
479 if (smtperr >= 500 && smtperr <= 599)
480 if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
481 "General SMTP/ESMTP error.\r\n",
483 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
485 * We're going to end up here on 4xx errors, like:
487 * 451: temporarily unable to identify sender (exim)
488 * 452: temporary out-of-queue-space condition on the ESMTP server.
490 * These are temporary errors. Don't try to ship the message,
491 * and suppress deletion so it can be retried on a future
494 * Bouncemail *might* be appropriate here as a delay
495 * notification (note; if we ever add this, we must make
496 * sure the RFC1894 Action field is "delayed" rather thwn
497 * "failed"). But it's not really necessary because
498 * these are not actual failures, we're very likely to be
499 * able to recover on the next cycle.
501 return(PS_TRANSIENT);
505 int open_sink(struct query *ctl, struct msgblk *msg,
506 int *good_addresses, int *bad_addresses)
507 /* set up sinkfp to be an input sink we can ship a message to */
510 #ifdef HAVE_SIGACTION
511 struct sigaction sa_new;
512 #endif /* HAVE_SIGACTION */
514 *bad_addresses = *good_addresses = 0;
516 if (ctl->bsmtp) /* dump to a BSMTP batch file */
518 if (strcmp(ctl->bsmtp, "-") == 0)
521 sinkfp = fopen(ctl->bsmtp, "a");
523 /* see the ap computation under the SMTP branch */
525 "MAIL FROM: %s", (msg->return_path[0]) ? msg->return_path : user);
527 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
528 fputs(" BODY=8BITMIME", sinkfp);
529 else if (ctl->mimemsg & MSG_IS_7BIT)
530 fputs(" BODY=7BIT", sinkfp);
532 /* exim's BSMTP processor does not handle SIZE */
533 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
535 fprintf(sinkfp, "\r\n");
538 * RFC 1123 requires that the domain name part of the
539 * RCPT TO address be "canonicalized", that is a FQDN
540 * or MX but not a CNAME. Some listeners (like exim)
541 * enforce this. Now that we have the actual hostname,
542 * compute what we should canonicalize with.
544 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
547 for (idp = msg->recipients; idp; idp = idp->next)
548 if (idp->val.status.mark == XMIT_ACCEPT)
551 fprintf(sinkfp, "RCPT TO: %s\r\n", ctl->smtpname);
552 else if (strchr(idp->id, '@'))
554 "RCPT TO: %s\r\n", idp->id);
557 "RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
561 fputs("DATA\r\n", sinkfp);
565 report(stderr, _("BSMTP file open or preamble write failed\n"));
571 * Try to forward to an SMTP or LMTP listener. If the attempt to
572 * open a socket fails, fall through to attempt delivery via
575 else if (!ctl->mda && smtp_open(ctl) != -1)
578 char options[MSGBUFSIZE];
579 char addr[HOSTLEN+USERNAMELEN+1];
580 char **from_responses;
584 * Compute ESMTP options.
587 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
588 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
589 strcpy(options, " BODY=8BITMIME");
590 else if (ctl->mimemsg & MSG_IS_7BIT)
591 strcpy(options, " BODY=7BIT");
594 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
595 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
598 * Try to get the SMTP listener to take the Return-Path
599 * address as MAIL FROM. If it won't, fall back on the
600 * remotename and mailserver host. This won't affect replies,
601 * which use the header From address anyway; the MAIL FROM
602 * address is a place for the SMTP listener to send
603 * bouncemail. The point is to guarantee a FQDN in the MAIL
604 * FROM line -- some SMTP listeners, like smail, become
607 * RFC 1123 requires that the domain name part of the
608 * MAIL FROM address be "canonicalized", that is a
609 * FQDN or MX but not a CNAME. We'll assume the Return-Path
610 * header is already in this form here (it certainly
611 * is if rewrite is on). RFC 1123 is silent on whether
612 * a nonexistent hostname part is considered canonical.
614 * This is a potential problem if the MTAs further upstream
615 * didn't pass canonicalized From/Return-Path lines, *and* the
616 * local SMTP listener insists on them.
618 if (!msg->return_path[0])
621 snprintf(addr, sizeof(addr),
624 #endif /* HAVE_SNPRINTF */
625 "%s@%s", ctl->remotename, ctl->server.truename);
628 else if (strchr(msg->return_path, '@'))
629 ap = msg->return_path;
630 else /* in case Return-Path existed but was local */
633 snprintf(addr, sizeof(addr),
636 #endif /* HAVE_SNPRINTF */
637 "%s@%s", msg->return_path, ctl->server.truename);
641 if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
642 return(handle_smtp_report(ctl, msg));
645 * Now list the recipient addressees
648 for (idp = msg->recipients; idp; idp = idp->next)
650 xalloca(from_responses, char **, sizeof(char *) * total_addresses);
651 for (idp = msg->recipients; idp; idp = idp->next)
652 if (idp->val.status.mark == XMIT_ACCEPT)
654 if (strchr(idp->id, '@'))
655 strcpy(addr, idp->id);
659 snprintf(addr, sizeof(addr)-1, "%s", ctl->smtpname);
661 sprintf(addr, "%s", ctl->smtpname);
662 #endif /* HAVE_SNPRINTF */
666 snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
668 sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
669 #endif /* HAVE_SNPRINTF */
672 if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
676 char errbuf[POPBUFSIZE];
680 * I don't remember how this got in here, but it doesn't
681 * work. The obvious symptom is that no bounce message
682 * is sent for a nonexistent user. Less obviously
683 * Forwarding to postmaster also does not work. The body is
686 * If a mail is sent to one valid and one invalid
687 * user, the mail does not go to the valid user
688 * also as the body is discarded after calling
692 if ((res = handle_smtp_report(ctl, msg))==PS_REFUSED)
694 #endif /* __UNUSED__ */
697 snprintf(errbuf, sizeof(errbuf), "%s: %s",
698 idp->id, smtp_response);
700 strncpy(errbuf, idp->id, sizeof(errbuf));
701 strcat(errbuf, ": ");
702 strcat(errbuf, smtp_response);
703 #endif /* HAVE_SNPRINTF */
705 xalloca(from_responses[*bad_addresses],
708 strcpy(from_responses[*bad_addresses], errbuf);
711 idp->val.status.mark = XMIT_RCPTBAD;
712 if (outlevel >= O_VERBOSE)
714 _("%cMTP listener doesn't like recipient address `%s'\n"),
715 ctl->listener, addr);
719 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
720 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
721 *bad_addresses, from_responses);
723 * It's tempting to do local notification only if bouncemail was
724 * insufficient -- that is, to add && total_addresses > *bad_addresses
725 * to the test here. The problem with this theory is that it would
726 * make initial diagnosis of a broken multidrop configuration very
727 * hard -- most single-recipient messages would just invisibly bounce.
729 if (!(*good_addresses))
731 if (strchr(run.postmaster, '@'))
732 strncpy(addr, run.postmaster, sizeof(addr));
736 snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
738 sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
739 #endif /* HAVE_SNPRINTF */
742 if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
744 report(stderr, _("can't even send to %s!\n"), run.postmaster);
745 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
749 if (outlevel >= O_VERBOSE)
750 report(stderr, _("no address matches; forwarding to %s.\n"), run.postmaster);
754 * Tell the listener we're ready to send data.
755 * Some listeners (like zmailer) may return antispam errors here.
757 if (SMTP_data(ctl->smtp_socket) != SM_OK)
758 return(handle_smtp_report(ctl, msg));
762 * Awkward case. User didn't specify an MDA. Our attempt to get a
763 * listener socket failed. Try to cope anyway -- initial configuration
764 * may have found procmail.
768 report(stderr, _("%cMTP connect to %s failed\n"),
770 ctl->smtphost ? ctl->smtphost : "localhost");
773 /* No fallback MDA declared. Bail out. */
777 * If user had things set up to forward offsite, no way
778 * we want to deliver locally!
780 if (ctl->smtphost && strcmp(ctl->smtphost, "localhost"))
784 * User was delivering locally. We have a fallback MDA.
785 * Latch it in place, logging the error, and fall through.
787 ctl->mda = FALLBACK_MDA;
789 report(stderr, _("can't raise the listener; falling back to %s"),
794 if (ctl->mda) /* must deliver through an MDA */
796 int length = 0, fromlen = 0, nameslen = 0;
797 char *names = NULL, *before, *after, *from = NULL;
799 ctl->destaddr = "localhost";
801 for (idp = msg->recipients; idp; idp = idp->next)
802 if (idp->val.status.mark == XMIT_ACCEPT)
805 length = strlen(ctl->mda);
806 before = xstrdup(ctl->mda);
808 /* get user addresses for %T (or %s for backward compatibility) */
809 if (strstr(before, "%s") || strstr(before, "%T"))
812 * We go through this in order to be able to handle very
813 * long lists of users and (re)implement %s.
816 for (idp = msg->recipients; idp; idp = idp->next)
817 if ((idp->val.status.mark == XMIT_ACCEPT))
818 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
819 if ((*good_addresses == 0))
820 nameslen = strlen(run.postmaster);
822 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
823 if (*good_addresses == 0)
824 strcpy(names, run.postmaster);
828 for (idp = msg->recipients; idp; idp = idp->next)
829 if (idp->val.status.mark == XMIT_ACCEPT)
831 strcat(names, idp->id);
834 names[--nameslen] = '\0'; /* chop trailing space */
837 /* sanitize names in order to contain only harmless shell chars */
841 /* get From address for %F */
842 if (strstr(before, "%F"))
844 from = xstrdup(msg->return_path);
846 /* sanitize from in order to contain *only* harmless shell chars */
849 fromlen = strlen(from);
852 /* do we have to build an mda string? */
857 /* find length of resulting mda string */
859 while ((sp = strstr(sp, "%s"))) {
860 length += nameslen - 2; /* subtract %s */
864 while ((sp = strstr(sp, "%T"))) {
865 length += nameslen - 2; /* subtract %T */
869 while ((sp = strstr(sp, "%F"))) {
870 length += fromlen - 2; /* subtract %F */
874 after = xmalloc(length + 1);
876 /* copy mda source string to after, while expanding %[sTF] */
877 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
878 if (sp[0] != '%') continue;
880 /* need to expand? BTW, no here overflow, because in
881 ** the worst case (end of string) sp[1] == '\0' */
882 if (sp[1] == 's' || sp[1] == 'T') {
885 sp++; /* position sp over [sT] */
886 dp--; /* adjust dp */
887 } else if (sp[1] == 'F') {
890 sp++; /* position sp over F */
891 dp--; /* adjust dp */
910 if (outlevel >= O_DEBUG)
911 report(stdout, _("about to deliver with: %s\n"), before);
915 * Arrange to run with user's permissions if we're root.
916 * This will initialize the ownership of any files the
917 * MDA creates properly. (The seteuid call is available
918 * under all BSDs and Linux)
921 #endif /* HAVE_SETEUID */
923 sinkfp = popen(before, "w");
928 /* this will fail quietly if we didn't start as root */
930 #endif /* HAVE_SETEUID */
934 report(stderr, _("MDA open failed\n"));
938 #ifndef HAVE_SIGACTION
939 sigchld = signal(SIGCHLD, SIG_DFL);
941 memset (&sa_new, 0, sizeof sa_new);
942 sigemptyset (&sa_new.sa_mask);
943 sa_new.sa_handler = SIG_DFL;
944 sigaction (SIGCHLD, &sa_new, &sa_old);
945 #endif /* HAVE_SIGACTION */
949 * We need to stash this away in order to know how many
950 * response lines to expect after the LMTP end-of-message.
952 lmtp_responses = *good_addresses;
957 void release_sink(struct query *ctl)
958 /* release the per-message output sink, whether it's a pipe or SMTP socket */
960 if (ctl->bsmtp && sinkfp)
967 sinkfp = (FILE *)NULL;
969 #ifndef HAVE_SIGACTION
970 signal(SIGCHLD, sigchld);
972 sigaction (SIGCHLD, &sa_old, NULL);
973 #endif /* HAVE_SIGACTION */
978 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
979 /* perform end-of-message actions on the current output sink */
985 /* close the delivery pipe, we'll reopen before next message */
989 sinkfp = (FILE *)NULL;
993 #ifndef HAVE_SIGACTION
994 signal(SIGCHLD, sigchld);
996 sigaction (SIGCHLD, &sa_old, NULL);
997 #endif /* HAVE_SIGACTION */
1002 _("MDA exited abnormally or returned nonzero status\n"));
1006 else if (ctl->bsmtp && sinkfp)
1010 /* implicit disk-full check here... */
1011 fputs(".\r\n", sinkfp);
1012 error = ferror(sinkfp);
1013 if (strcmp(ctl->bsmtp, "-"))
1014 if (fclose(sinkfp) == EOF) error = 1;
1018 _("Message termination or close of BSMTP file failed\n"));
1024 /* write message terminator */
1025 if (SMTP_eom(ctl->smtp_socket) != SM_OK)
1027 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
1031 report(stderr, _("SMTP listener refused delivery\n"));
1037 * If this is an SMTP connection, SMTP_eom() ate the response.
1038 * But could be this is an LMTP connection, in which case we have to
1039 * interpret either (a) a single 503 response meaning there
1040 * were no successful RCPT TOs, or (b) a variable number of
1041 * responses, one for each successful RCPT TO. We need to send
1042 * bouncemail on each failed response and then return TRUE anyway,
1043 * otherwise the message will get left in the queue and resent
1044 * to people who got it the first time.
1046 if (ctl->listener == LMTP_MODE)
1048 if (lmtp_responses == 0)
1050 SMTP_ok(ctl->smtp_socket);
1053 * According to RFC2033, 503 is the only legal response
1054 * if no RCPT TO commands succeeded. No error recovery
1055 * is really possible here, as we have no idea what
1056 * insane thing the listener might be doing if it doesn't
1059 if (atoi(smtp_response) == 503)
1060 report(stderr, _("LMTP delivery error on EOM\n"));
1063 _("Unexpected non-503 response to LMTP EOM: %s\n"),
1067 * It's not completely clear what to do here. We choose to
1068 * interpret delivery failure here as a transient error,
1069 * the same way SMTP delivery failure is handled. If we're
1070 * wrong, an undead message will get stuck in the queue.
1079 /* eat the RFC2033-required responses, saving errors */
1080 xalloca(responses, char **, sizeof(char *) * lmtp_responses);
1081 for (errors = i = 0; i < lmtp_responses; i++)
1083 if (SMTP_ok(ctl->smtp_socket) == SM_OK)
1084 responses[i] = (char *)NULL;
1087 xalloca(responses[errors],
1089 strlen(smtp_response)+1);
1090 strcpy(responses[errors], smtp_response);
1096 return(TRUE); /* all deliveries succeeded */
1099 * One or more deliveries failed.
1100 * If we can bounce a failures list back to the
1101 * sender, and the postmaster does not want to
1102 * deal with the bounces return TRUE, deleting the
1103 * message from the server so it won't be
1104 * re-forwarded on subsequent poll cycles.
1106 return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
1107 "LSMTP partial delivery failure.\r\n",
1108 errors, responses));
1116 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
1117 /* set up output sink for a mailed warning to calling user */
1122 * Dispatching warning email is a little complicated. The problem is
1123 * that we have to deal with three distinct cases:
1125 * 1. Single-drop running from user account. Warning mail should
1126 * go to the local name for which we're collecting (coincides
1127 * with calling user).
1129 * 2. Single-drop running from root or other privileged ID, with rc
1130 * file generated on the fly (Ken Estes's weird setup...) Mail
1131 * should go to the local name for which we're collecting (does not
1132 * coincide with calling user).
1134 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1135 * member null so this message will fall through to run.postmaster.
1137 * The zero in the reallen element means we won't pass a SIZE
1138 * option to ESMTP; the message length would be more trouble than
1139 * it's worth to compute.
1141 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
1143 strcat(reply.return_path, fetchmailhost);
1145 if (!MULTIDROP(ctl)) /* send to calling user */
1149 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1150 status = open_sink(ctl, &reply, &good, &bad);
1151 free_str_list(&reply.recipients);
1154 else /* send to postmaster */
1155 return(open_sink(ctl, &reply, &good, &bad));
1158 #if defined(HAVE_STDARG_H)
1159 void stuff_warning(struct query *ctl, const char *fmt, ... )
1161 void stuff_warning(struct query *ctl, fmt, va_alist)
1163 const char *fmt; /* printf-style format */
1166 /* format and ship a warning message line by mail */
1168 char buf[POPBUFSIZE];
1172 * stuffline() requires its input to be writeable (for CR stripping),
1173 * so we needed to copy the message to a writeable buffer anyway in
1174 * case it was a string constant. We make a virtue of that necessity
1175 * here by supporting stdargs/varargs.
1177 #if defined(HAVE_STDARG_H)
1182 #ifdef HAVE_VSNPRINTF
1183 vsnprintf(buf, sizeof(buf), fmt, ap);
1185 vsprintf(buf, fmt, ap);
1189 #ifdef HAVE_SNPRINTF
1190 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1192 strcat(buf, "\r\n");
1193 #endif /* HAVE_SNPRINTF */
1195 stuffline(ctl, buf);
1198 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1199 /* sign and send mailed warnings */
1201 stuff_warning(ctl, _("--\r\n\t\t\t\tThe Fetchmail Daemon\r\n"));
1202 close_sink(ctl, msg, TRUE);
1205 /* sink.c ends here */