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)
36 #include "fetchmail.h"
41 /* BSD portability hack...I know, this is an ugly place to put it */
42 #if !defined(SIGCHLD) && defined(SIGCLD)
43 #define SIGCHLD SIGCLD
46 /* makes the open_sink()/close_sink() pair non-reentrant */
47 static int lmtp_responses;
49 int smtp_open(struct query *ctl)
50 /* try to open a socket to the appropriate SMTP server for this query */
52 /* maybe it's time to close the socket in order to force delivery */
53 if (NUM_NONZERO(ctl->batchlimit) && (ctl->smtp_socket != -1) && ++batchcount == ctl->batchlimit)
55 SockClose(ctl->smtp_socket);
56 ctl->smtp_socket = -1;
60 /* if no socket to any SMTP host is already set up, try to open one */
61 if (ctl->smtp_socket == -1)
64 * RFC 1123 requires that the domain name in HELO address is a
65 * "valid principal domain name" for the client host. If we're
66 * running in invisible mode, violate this with malice
67 * aforethought in order to make the Received headers and
70 * In fact this code relies on the RFC1123 requirement that the
71 * SMTP listener must accept messages even if verification of the
72 * HELO name fails (RFC1123 section 5.2.5, paragraph 2).
74 * How we compute the true mailhost name to pass to the
75 * listener doesn't affect behavior on RFC1123-violating
76 * listeners that check for name match; we're going to lose
77 * on those anyway because we can never give them a name
78 * that matches the local machine fetchmail is running on.
79 * What it will affect is the listener's logging.
82 const char *id_me = run.invisible ? ctl->server.truename : fetchmailhost;
88 * Run down the SMTP hunt list looking for a server that's up.
89 * Use both explicit hunt entries (value TRUE) and implicit
90 * (default) ones (value FALSE).
93 phase = LISTENER_WAIT;
95 set_timeout(ctl->server.timeout);
96 for (idp = ctl->smtphunt; idp; idp = idp->next)
98 char *cp, *parsed_host;
100 char *portnum = SMTP_PORT;
102 int portnum = SMTP_PORT;
103 #endif /* INET6_ENABLE */
105 xalloca(parsed_host, char *, strlen(idp->id) + 1);
107 ctl->smtphost = idp->id; /* remember last host tried. */
108 if(ctl->smtphost[0]=='/')
109 ctl->listener = LMTP_MODE;
111 strcpy(parsed_host, idp->id);
112 if ((cp = strrchr(parsed_host, '/')))
119 #endif /* INET6_ENABLE */
122 if (ctl->smtphost[0]=='/'){
123 if((ctl->smtp_socket = UnixOpen(ctl->smtphost))==-1)
126 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
127 ctl->server.plugout)) == -1)
130 /* return immediately for ODMR */
131 if (ctl->server.protocol == P_ODMR)
132 return(ctl->smtp_socket); /* success */
134 /* are we doing SMTP or LMTP? */
135 SMTP_setmode(ctl->listener);
137 /* first, probe for ESMTP */
138 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
139 SMTP_ehlo(ctl->smtp_socket, id_me,
140 &ctl->server.esmtp_options) == SM_OK)
144 * RFC 1869 warns that some listeners hang up on a failed EHLO,
145 * so it's safest not to assume the socket will still be good.
147 SockClose(ctl->smtp_socket);
148 ctl->smtp_socket = -1;
150 /* if opening for ESMTP failed, try SMTP */
151 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
152 ctl->server.plugout)) == -1)
155 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
156 SMTP_helo(ctl->smtp_socket, id_me) == SM_OK)
159 SockClose(ctl->smtp_socket);
160 ctl->smtp_socket = -1;
167 * RFC 1123 requires that the domain name part of the
168 * RCPT TO address be "canonicalized", that is a FQDN
169 * or MX but not a CNAME. Some listeners (like exim)
170 * enforce this. Now that we have the actual hostname,
171 * compute what we should canonicalize with.
173 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : ( ctl->smtphost && ctl->smtphost[0] != '/' ? ctl->smtphost : "localhost");
175 if (outlevel >= O_DEBUG && ctl->smtp_socket != -1)
176 report(stdout, _("forwarding to %s\n"), ctl->smtphost);
178 return(ctl->smtp_socket);
181 /* these are shared by open_sink and stuffline */
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);
402 * Don't do this! It can really mess you up if, for example, you're
403 * reporting an error with a single RCPT TO address among several;
404 * RSET discards the message body and it doesn't get sent to the
407 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
408 if (outlevel >= O_DEBUG)
409 report(stdout, _("Saved error is still %d\n"), smtperr);
410 #endif /* __UNUSED */
413 * Note: send_bouncemail message strings are not made subject
414 * to gettext translation because (a) they're going to be
415 * embedded in a text/plain 7bit part, and (b) they're
416 * going to be associated with listener error-response
417 * messages, which are probably in English (none of the
418 * MTAs I know about are internationalized).
420 if (str_find(&ctl->antispam, smtperr))
423 * SMTP listener explicitly refuses to deliver mail
424 * coming from this address, probably due to an
425 * anti-spam domain exclusion. Respect this. Don't
426 * try to ship the message, and don't prevent it from
427 * being deleted. There's no point in bouncing the
428 * email either since most spammers don't put their
429 * real return email address anywhere in the headers
430 * (unless the user insists with the SET SPAMBOUNCE
435 * 571 = sendmail's "unsolicited email refused"
436 * 550 = exim's new antispam response (temporary)
437 * 501 = exim's old antispam response
438 * 554 = Postfix antispam response.
442 send_bouncemail(ctl, msg, XMIT_ACCEPT,
443 "Our spam filter rejected this transaction.\r\n",
449 * Suppress error message only if the response specifically
450 * meant `excluded for policy reasons'. We *should* see
451 * an error when the return code is less specific.
454 report(stderr, _("%cMTP error: %s\n"),
460 case 552: /* message exceeds fixed maximum message size */
462 * Permanent no-go condition on the
463 * ESMTP server. Don't try to ship the message,
464 * and allow it to be deleted.
466 send_bouncemail(ctl, msg, XMIT_ACCEPT,
467 "This message was too large (SMTP error 552).\r\n",
469 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
471 case 553: /* invalid sending domain */
473 * These latter days 553 usually means a spammer is trying to
474 * cover his tracks. We never bouncemail on these, because
475 * (a) the return address is invalid by definition, and
476 * (b) we wouldn't want spammers to get confirmation that
477 * this address is live, anyway.
479 send_bouncemail(ctl, msg, XMIT_ACCEPT,
480 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
485 /* bounce non-transient errors back to the sender */
486 if (smtperr >= 500 && smtperr <= 599)
487 if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
488 "General SMTP/ESMTP error.\r\n",
490 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
492 * We're going to end up here on 4xx errors, like:
494 * 451: temporarily unable to identify sender (exim)
495 * 452: temporary out-of-queue-space condition on the ESMTP server.
497 * These are temporary errors. Don't try to ship the message,
498 * and suppress deletion so it can be retried on a future
501 * Bouncemail *might* be appropriate here as a delay
502 * notification (note; if we ever add this, we must make
503 * sure the RFC1894 Action field is "delayed" rather thwn
504 * "failed"). But it's not really necessary because
505 * these are not actual failures, we're very likely to be
506 * able to recover on the next cycle.
508 return(PS_TRANSIENT);
512 int open_sink(struct query *ctl, struct msgblk *msg,
513 int *good_addresses, int *bad_addresses)
514 /* set up sinkfp to be an input sink we can ship a message to */
517 #ifdef HAVE_SIGACTION
518 struct sigaction sa_new;
519 #endif /* HAVE_SIGACTION */
521 *bad_addresses = *good_addresses = 0;
523 if (ctl->bsmtp) /* dump to a BSMTP batch file */
525 if (strcmp(ctl->bsmtp, "-") == 0)
528 sinkfp = fopen(ctl->bsmtp, "a");
530 /* see the ap computation under the SMTP branch */
532 "MAIL FROM: %s", (msg->return_path[0]) ? msg->return_path : user);
534 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
535 fputs(" BODY=8BITMIME", sinkfp);
536 else if (ctl->mimemsg & MSG_IS_7BIT)
537 fputs(" BODY=7BIT", sinkfp);
539 /* exim's BSMTP processor does not handle SIZE */
540 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
542 fprintf(sinkfp, "\r\n");
545 * RFC 1123 requires that the domain name part of the
546 * RCPT TO address be "canonicalized", that is a FQDN
547 * or MX but not a CNAME. Some listeners (like exim)
548 * enforce this. Now that we have the actual hostname,
549 * compute what we should canonicalize with.
551 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
554 for (idp = msg->recipients; idp; idp = idp->next)
555 if (idp->val.status.mark == XMIT_ACCEPT)
558 fprintf(sinkfp, "RCPT TO: %s\r\n", ctl->smtpname);
559 else if (strchr(idp->id, '@'))
561 "RCPT TO: %s\r\n", idp->id);
564 "RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
568 fputs("DATA\r\n", sinkfp);
572 report(stderr, _("BSMTP file open or preamble write failed\n"));
578 * Try to forward to an SMTP or LMTP listener. If the attempt to
579 * open a socket fails, fall through to attempt delivery via
582 else if (!ctl->mda && smtp_open(ctl) != -1)
585 char options[MSGBUFSIZE];
586 char addr[HOSTLEN+USERNAMELEN+1];
587 char **from_responses;
591 * Compute ESMTP options.
594 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
595 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
596 strcpy(options, " BODY=8BITMIME");
597 else if (ctl->mimemsg & MSG_IS_7BIT)
598 strcpy(options, " BODY=7BIT");
601 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
602 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
605 * Try to get the SMTP listener to take the Return-Path
606 * address as MAIL FROM. If it won't, fall back on the
607 * remotename and mailserver host. This won't affect replies,
608 * which use the header From address anyway; the MAIL FROM
609 * address is a place for the SMTP listener to send
610 * bouncemail. The point is to guarantee a FQDN in the MAIL
611 * FROM line -- some SMTP listeners, like smail, become
614 * RFC 1123 requires that the domain name part of the
615 * MAIL FROM address be "canonicalized", that is a
616 * FQDN or MX but not a CNAME. We'll assume the Return-Path
617 * header is already in this form here (it certainly
618 * is if rewrite is on). RFC 1123 is silent on whether
619 * a nonexistent hostname part is considered canonical.
621 * This is a potential problem if the MTAs further upstream
622 * didn't pass canonicalized From/Return-Path lines, *and* the
623 * local SMTP listener insists on them.
625 * Handle the case where an upstream MTA is setting a return
626 * path equal to "@". Ghod knows why anyone does this, but
627 * it's been reported to happen in mail from Amazon.com and
630 if (!msg->return_path[0] || (0 == strcmp(msg->return_path, "@")))
633 snprintf(addr, sizeof(addr),
636 #endif /* HAVE_SNPRINTF */
637 "%s@%s", ctl->remotename, ctl->server.truename);
640 else if (strchr(msg->return_path, '@'))
641 ap = msg->return_path;
642 else /* in case Return-Path existed but was local */
645 snprintf(addr, sizeof(addr),
648 #endif /* HAVE_SNPRINTF */
649 "%s@%s", msg->return_path, ctl->server.truename);
653 if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
655 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
656 return(handle_smtp_report(ctl, msg));
660 * Now list the recipient addressees
663 for (idp = msg->recipients; idp; idp = idp->next)
665 xalloca(from_responses, char **, sizeof(char *) * total_addresses);
666 for (idp = msg->recipients; idp; idp = idp->next)
667 if (idp->val.status.mark == XMIT_ACCEPT)
669 if (strchr(idp->id, '@'))
670 strcpy(addr, idp->id);
674 snprintf(addr, sizeof(addr)-1, "%s", ctl->smtpname);
676 sprintf(addr, "%s", ctl->smtpname);
677 #endif /* HAVE_SNPRINTF */
681 snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
683 sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
684 #endif /* HAVE_SNPRINTF */
687 if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
691 char errbuf[POPBUFSIZE];
694 * Do *not* interpret a PS_REFUSED here as a directive
695 * to break out of the address loop. We want to go through
696 * and process the rest of the RCPT TO addresses.
698 handle_smtp_report(ctl, msg);
701 snprintf(errbuf, sizeof(errbuf), "%s: %s",
702 idp->id, smtp_response);
704 strncpy(errbuf, idp->id, sizeof(errbuf));
705 strcat(errbuf, ": ");
706 strcat(errbuf, smtp_response);
707 #endif /* HAVE_SNPRINTF */
709 xalloca(from_responses[*bad_addresses],
712 strcpy(from_responses[*bad_addresses], errbuf);
715 idp->val.status.mark = XMIT_RCPTBAD;
716 if (outlevel >= O_VERBOSE)
718 _("%cMTP listener doesn't like recipient address `%s'\n"),
719 ctl->listener, addr);
723 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
724 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
725 *bad_addresses, from_responses);
727 * It's tempting to do local notification only if bouncemail was
728 * insufficient -- that is, to add && total_addresses > *bad_addresses
729 * to the test here. The problem with this theory is that it would
730 * make initial diagnosis of a broken multidrop configuration very
731 * hard -- most single-recipient messages would just invisibly bounce.
733 if (!(*good_addresses))
735 if (!run.postmaster[0])
737 if (outlevel >= O_VERBOSE)
738 report(stderr, _("no address matches; no postmaster set.\n"));
739 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
742 if (strchr(run.postmaster, '@'))
743 strncpy(addr, run.postmaster, sizeof(addr));
747 snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
749 sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
750 #endif /* HAVE_SNPRINTF */
753 if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
755 report(stderr, _("can't even send to %s!\n"), run.postmaster);
756 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
760 if (outlevel >= O_VERBOSE)
761 report(stderr, _("no address matches; forwarding to %s.\n"), run.postmaster);
765 * Tell the listener we're ready to send data.
766 * Some listeners (like zmailer) may return antispam errors here.
768 if (SMTP_data(ctl->smtp_socket) != SM_OK)
770 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
771 return(handle_smtp_report(ctl, msg));
776 * Awkward case. User didn't specify an MDA. Our attempt to get a
777 * listener socket failed. Try to cope anyway -- initial configuration
778 * may have found procmail.
782 report(stderr, _("%cMTP connect to %s failed\n"),
784 ctl->smtphost ? ctl->smtphost : "localhost");
787 /* No fallback MDA declared. Bail out. */
791 * If user had things set up to forward offsite, no way
792 * we want to deliver locally!
794 if (ctl->smtphost && strcmp(ctl->smtphost, "localhost"))
798 * User was delivering locally. We have a fallback MDA.
799 * Latch it in place, logging the error, and fall through.
801 ctl->mda = FALLBACK_MDA;
803 report(stderr, _("can't raise the listener; falling back to %s"),
808 if (ctl->mda) /* must deliver through an MDA */
810 int length = 0, fromlen = 0, nameslen = 0;
811 char *names = NULL, *before, *after, *from = NULL;
813 ctl->destaddr = "localhost";
815 for (idp = msg->recipients; idp; idp = idp->next)
816 if (idp->val.status.mark == XMIT_ACCEPT)
819 length = strlen(ctl->mda);
820 before = xstrdup(ctl->mda);
822 /* get user addresses for %T (or %s for backward compatibility) */
823 if (strstr(before, "%s") || strstr(before, "%T"))
826 * We go through this in order to be able to handle very
827 * long lists of users and (re)implement %s.
830 for (idp = msg->recipients; idp; idp = idp->next)
831 if ((idp->val.status.mark == XMIT_ACCEPT))
832 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
833 if ((*good_addresses == 0))
834 nameslen = strlen(run.postmaster);
836 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
837 if (*good_addresses == 0)
838 strcpy(names, run.postmaster);
842 for (idp = msg->recipients; idp; idp = idp->next)
843 if (idp->val.status.mark == XMIT_ACCEPT)
845 strcat(names, idp->id);
848 names[--nameslen] = '\0'; /* chop trailing space */
851 /* sanitize names in order to contain only harmless shell chars */
855 /* get From address for %F */
856 if (strstr(before, "%F"))
858 from = xstrdup(msg->return_path);
860 /* sanitize from in order to contain *only* harmless shell chars */
863 fromlen = strlen(from);
866 /* do we have to build an mda string? */
871 /* find length of resulting mda string */
873 while ((sp = strstr(sp, "%s"))) {
874 length += nameslen - 2; /* subtract %s */
878 while ((sp = strstr(sp, "%T"))) {
879 length += nameslen - 2; /* subtract %T */
883 while ((sp = strstr(sp, "%F"))) {
884 length += fromlen - 2; /* subtract %F */
888 after = xmalloc(length + 1);
890 /* copy mda source string to after, while expanding %[sTF] */
891 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
892 if (sp[0] != '%') continue;
894 /* need to expand? BTW, no here overflow, because in
895 ** the worst case (end of string) sp[1] == '\0' */
896 if (sp[1] == 's' || sp[1] == 'T') {
899 sp++; /* position sp over [sT] */
900 dp--; /* adjust dp */
901 } else if (sp[1] == 'F') {
904 sp++; /* position sp over F */
905 dp--; /* adjust dp */
924 if (outlevel >= O_DEBUG)
925 report(stdout, _("about to deliver with: %s\n"), before);
929 * Arrange to run with user's permissions if we're root.
930 * This will initialize the ownership of any files the
931 * MDA creates properly. (The seteuid call is available
932 * under all BSDs and Linux)
935 #endif /* HAVE_SETEUID */
937 sinkfp = popen(before, "w");
942 /* this will fail quietly if we didn't start as root */
944 #endif /* HAVE_SETEUID */
948 report(stderr, _("MDA open failed\n"));
953 * We need to disable the normal SIGCHLD handling here because
954 * sigchld_handler() would reap away the error status, returning
955 * error status instead of 0 for successful completion.
957 #ifndef HAVE_SIGACTION
958 sigchld = signal(SIGCHLD, SIG_DFL);
960 memset (&sa_new, 0, sizeof sa_new);
961 sigemptyset (&sa_new.sa_mask);
962 sa_new.sa_handler = SIG_DFL;
963 sigaction (SIGCHLD, &sa_new, NULL);
964 #endif /* HAVE_SIGACTION */
968 * We need to stash this away in order to know how many
969 * response lines to expect after the LMTP end-of-message.
971 lmtp_responses = *good_addresses;
976 void release_sink(struct query *ctl)
977 /* release the per-message output sink, whether it's a pipe or SMTP socket */
979 if (ctl->bsmtp && sinkfp)
986 sinkfp = (FILE *)NULL;
988 deal_with_sigchld(); /* Restore SIGCHLD handling to reap zombies */
992 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
993 /* perform end-of-message actions on the current output sink */
999 /* close the delivery pipe, we'll reopen before next message */
1002 rc = pclose(sinkfp);
1003 sinkfp = (FILE *)NULL;
1008 deal_with_sigchld(); /* Restore SIGCHLD handling to reap zombies */
1013 _("MDA returned nonzero status %d\n"), rc);
1017 else if (ctl->bsmtp && sinkfp)
1021 /* implicit disk-full check here... */
1022 fputs(".\r\n", sinkfp);
1023 error = ferror(sinkfp);
1024 if (strcmp(ctl->bsmtp, "-"))
1025 if (fclose(sinkfp) == EOF) error = 1;
1029 _("Message termination or close of BSMTP file failed\n"));
1035 /* write message terminator */
1036 if (SMTP_eom(ctl->smtp_socket) != SM_OK)
1038 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
1039 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
1043 report(stderr, _("SMTP listener refused delivery\n"));
1049 * If this is an SMTP connection, SMTP_eom() ate the response.
1050 * But could be this is an LMTP connection, in which case we have to
1051 * interpret either (a) a single 503 response meaning there
1052 * were no successful RCPT TOs, or (b) a variable number of
1053 * responses, one for each successful RCPT TO. We need to send
1054 * bouncemail on each failed response and then return TRUE anyway,
1055 * otherwise the message will get left in the queue and resent
1056 * to people who got it the first time.
1058 if (ctl->listener == LMTP_MODE)
1060 if (lmtp_responses == 0)
1062 SMTP_ok(ctl->smtp_socket);
1065 * According to RFC2033, 503 is the only legal response
1066 * if no RCPT TO commands succeeded. No error recovery
1067 * is really possible here, as we have no idea what
1068 * insane thing the listener might be doing if it doesn't
1071 if (atoi(smtp_response) == 503)
1072 report(stderr, _("LMTP delivery error on EOM\n"));
1075 _("Unexpected non-503 response to LMTP EOM: %s\n"),
1079 * It's not completely clear what to do here. We choose to
1080 * interpret delivery failure here as a transient error,
1081 * the same way SMTP delivery failure is handled. If we're
1082 * wrong, an undead message will get stuck in the queue.
1091 /* eat the RFC2033-required responses, saving errors */
1092 xalloca(responses, char **, sizeof(char *) * lmtp_responses);
1093 for (errors = i = 0; i < lmtp_responses; i++)
1095 if (SMTP_ok(ctl->smtp_socket) == SM_OK)
1096 responses[i] = (char *)NULL;
1099 xalloca(responses[errors],
1101 strlen(smtp_response)+1);
1102 strcpy(responses[errors], smtp_response);
1108 return(TRUE); /* all deliveries succeeded */
1111 * One or more deliveries failed.
1112 * If we can bounce a failures list back to the
1113 * sender, and the postmaster does not want to
1114 * deal with the bounces return TRUE, deleting the
1115 * message from the server so it won't be
1116 * re-forwarded on subsequent poll cycles.
1118 return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
1119 "LSMTP partial delivery failure.\r\n",
1120 errors, responses));
1128 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
1129 /* set up output sink for a mailed warning to calling user */
1134 * Dispatching warning email is a little complicated. The problem is
1135 * that we have to deal with three distinct cases:
1137 * 1. Single-drop running from user account. Warning mail should
1138 * go to the local name for which we're collecting (coincides
1139 * with calling user).
1141 * 2. Single-drop running from root or other privileged ID, with rc
1142 * file generated on the fly (Ken Estes's weird setup...) Mail
1143 * should go to the local name for which we're collecting (does not
1144 * coincide with calling user).
1146 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1147 * member null so this message will fall through to run.postmaster.
1149 * The zero in the reallen element means we won't pass a SIZE
1150 * option to ESMTP; the message length would be more trouble than
1151 * it's worth to compute.
1153 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
1155 strcat(reply.return_path, fetchmailhost);
1157 if (!MULTIDROP(ctl)) /* send to calling user */
1161 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1162 status = open_sink(ctl, &reply, &good, &bad);
1163 free_str_list(&reply.recipients);
1166 else /* send to postmaster */
1167 return(open_sink(ctl, &reply, &good, &bad));
1170 #if defined(HAVE_STDARG_H)
1171 void stuff_warning(struct query *ctl, const char *fmt, ... )
1173 void stuff_warning(struct query *ctl, fmt, va_alist)
1175 const char *fmt; /* printf-style format */
1178 /* format and ship a warning message line by mail */
1180 char buf[POPBUFSIZE];
1184 * stuffline() requires its input to be writeable (for CR stripping),
1185 * so we needed to copy the message to a writeable buffer anyway in
1186 * case it was a string constant. We make a virtue of that necessity
1187 * here by supporting stdargs/varargs.
1189 #if defined(HAVE_STDARG_H)
1194 #ifdef HAVE_VSNPRINTF
1195 vsnprintf(buf, sizeof(buf), fmt, ap);
1197 vsprintf(buf, fmt, ap);
1201 #ifdef HAVE_SNPRINTF
1202 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1204 strcat(buf, "\r\n");
1205 #endif /* HAVE_SNPRINTF */
1207 stuffline(ctl, buf);
1210 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1211 /* sign and send mailed warnings */
1213 stuff_warning(ctl, _("--\r\n\t\t\t\tThe Fetchmail Daemon\r\n"));
1214 close_sink(ctl, msg, TRUE);
1217 /* sink.c ends here */