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 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 close(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;
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, '/')))
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 static RETSIGTYPE (*sigchld)(int);
174 int stuffline(struct query *ctl, char *buf)
175 /* ship a line to the given control block's output sink (SMTP server or MDA) */
180 /* The line may contain NUL characters. Find the last char to use
181 * -- the real line termination is the sequence "\n\0".
184 while ((last += strlen(last)) && (last[-1] != '\n'))
187 /* fix message lines that have only \n termination (for qmail) */
190 if (last - 1 == buf || last[-2] != '\r')
199 phase = FORWARDING_WAIT;
202 * SMTP byte-stuffing. We only do this if the protocol does *not*
203 * use .<CR><LF> as EOM. If it does, the server will already have
204 * decorated any . lines it sends back up.
207 if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
212 /* writing to SMTP, leave the byte-stuffing in place */;
214 else /* if (!protocol->delimited) -- not byte-stuffed already */
217 SockWrite(ctl->smtp_socket, buf, 1); /* byte-stuff it */
219 /* leave it alone */;
222 /* we may need to strip carriage returns */
227 for (sp = tp = buf; sp < last; sp++)
235 if (ctl->mda || ctl->bsmtp)
236 n = fwrite(buf, 1, last - buf, sinkfp);
237 else if (ctl->smtp_socket != -1)
238 n = SockWrite(ctl->smtp_socket, buf, last - buf);
245 static void sanitize(char *s)
246 /* replace unsafe shellchars by an _ */
248 const static char *ok_chars = " 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
251 for (cp = s; *(cp += strspn(cp, ok_chars)); /* NO INCREMENT */)
255 static int send_bouncemail(struct query *ctl, struct msgblk *msg,
256 int userclass, char *message,
257 int nerrors, char *errors[])
258 /* bounce back an error report a la RFC 1892 */
260 char daemon_name[18 + HOSTLEN] = "FETCHMAIL-DAEMON@";
261 char boundary[BUFSIZ], *ts, *bounce_to;
264 /* don't bounce in reply to undeliverable bounces */
265 if (!msg->return_path[0] || strcmp(msg->return_path, "<>") == 0)
268 bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
270 SMTP_setmode(SMTP_MODE);
272 strcat(daemon_name, fetchmailhost);
274 /* we need only SMTP for this purpose */
275 if ((sock = SockOpen("localhost", SMTP_PORT, NULL, NULL)) == -1
276 || SMTP_ok(sock) != SM_OK
277 || SMTP_helo(sock, "localhost") != SM_OK
278 || SMTP_from(sock, daemon_name, (char *)NULL) != SM_OK
279 || SMTP_rcpt(sock, bounce_to) != SM_OK
280 || SMTP_data(sock) != SM_OK)
284 "om-mani-padme-hum-%d-%d-%ld",
285 (int)getpid(), (int)getppid(), time((time_t *)NULL));
287 ts = rfc822timestamp();
289 if (outlevel >= O_VERBOSE)
290 report(stdout, "SMTP: (bounce-message body)\n");
292 /* bouncemail headers */
293 SockPrintf(sock, "Return-Path: <>\r\n");
294 SockPrintf(sock, "From: %s\r\n", daemon_name);
295 SockPrintf(sock, "To: %s\r\n", bounce_to);
296 SockPrintf(sock, "MIME-Version: 1.0\r\n");
297 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
298 SockPrintf(sock, "\r\n");
300 /* RFC1892 part 1 -- human-readable message */
301 SockPrintf(sock, "--%s\r\n", boundary);
302 SockPrintf(sock,"Content-Type: text/plain\r\n");
303 SockPrintf(sock, "\r\n");
304 SockWrite(sock, message, strlen(message));
305 SockPrintf(sock, "\r\n");
306 SockPrintf(sock, "\r\n");
313 /* RFC1892 part 2 -- machine-readable responses */
314 SockPrintf(sock, "--%s\r\n", boundary);
315 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
316 SockPrintf(sock, "\r\n");
317 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fetchmailhost);
320 for (idp = msg->recipients; idp; idp = idp->next)
321 if (idp->val.status.mark == userclass)
324 /* Minimum RFC1894 compliance + Diagnostic-Code field */
325 SockPrintf(sock, "\r\n");
326 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n", idp->id);
327 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", ts);
328 SockPrintf(sock, "Action: failed\r\n");
331 /* one error applies to all users */
333 else if (nerrors > nusers)
335 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
339 /* errors correspond 1-1 to selected users */
340 error = errors[nusers++];
342 if (strlen(error) > 9 && isdigit(error[4])
343 && error[5] == '.' && isdigit(error[6])
344 && error[7] == '.' && isdigit(error[8]))
345 /* Enhanced status code available, use it */
346 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
348 /* Enhanced status code not available, fake one */
349 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
350 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
352 SockPrintf(sock, "\r\n");
355 /* RFC1892 part 3 -- headers of undelivered message */
356 SockPrintf(sock, "--%s\r\n", boundary);
357 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
358 SockPrintf(sock, "\r\n");
359 SockWrite(sock, msg->headers, strlen(msg->headers));
360 SockPrintf(sock, "\r\n");
361 SockPrintf(sock, "--%s--\r\n", boundary);
363 if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
371 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
372 /* handle SMTP errors based on the content of SMTP_response */
373 /* Mail is deleted from the server if this function returns PS_REFUSED. */
375 int smtperr = atoi(smtp_response);
378 xalloca(responses[0], char *, strlen(smtp_response)+1);
379 strcpy(responses[0], smtp_response);
382 * Note: send_bouncemail message strings are not made subject
383 * to gettext translation because (a) they're going to be
384 * embedded in a text/plain 7bit part, and (b) they're
385 * going to be associated with listener error-response
386 * messages, which are probably in English (none of the
387 * MTAs I know about are internationalized).
389 if (str_find(&ctl->antispam, smtperr))
392 * SMTP listener explicitly refuses to deliver mail
393 * coming from this address, probably due to an
394 * anti-spam domain exclusion. Respect this. Don't
395 * try to ship the message, and don't prevent it from
396 * being deleted. Typical values:
398 * 501 = exim's old antispam response
399 * 550 = exim's new antispam response (temporary)
400 * 553 = sendmail 8.8.7's generic REJECT
401 * 571 = sendmail's "unsolicited email refused"
404 SMTP_rset(ctl->smtp_socket); /* stay on the safe site */
405 send_bouncemail(ctl, msg, XMIT_ACCEPT,
406 "Our spam filter rejected this transaction.\r\n",
412 * Suppress error message only if the response specifically
413 * meant `excluded for policy reasons'. We *should* see
414 * an error when the return code is less specific.
417 report(stderr, _("%cMTP error: %s\n"),
423 case 452: /* insufficient system storage */
425 * Temporary out-of-queue-space condition on the
426 * ESMTP server. Don't try to ship the message,
427 * and suppress deletion so it can be retried on
428 * a future retrieval cycle.
430 * Bouncemail *might* be appropriate here as a delay
431 * notification (note; if we ever add this, we must make
432 * sure the RFC1894 Action field is "delayed" rather thwn
433 * "failed"). But it's not really necessary because
434 * this is not an actual failure, we're very likely to be
435 * able to recover on the next cycle.
437 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
438 return(PS_TRANSIENT);
440 case 552: /* message exceeds fixed maximum message size */
442 * Permanent no-go condition on the
443 * ESMTP server. Don't try to ship the message,
444 * and allow it to be deleted.
446 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
447 send_bouncemail(ctl, msg, XMIT_ACCEPT,
448 "This message was too large.\r\n",
450 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
452 case 553: /* invalid sending domain */
454 * These latter days 553 usually means a spammer is trying to
457 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
458 send_bouncemail(ctl, msg, XMIT_ACCEPT,
459 "Invalid address.\r\n",
463 default: /* bounce the error back to the sender */
464 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
465 if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
466 "General SMTP/ESMTP error.\r\n",
468 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
470 return(PS_TRANSIENT);
474 int open_sink(struct query *ctl, struct msgblk *msg,
475 int *good_addresses, int *bad_addresses)
476 /* set up sinkfp to be an input sink we can ship a message to */
480 *bad_addresses = *good_addresses = 0;
482 if (ctl->bsmtp) /* dump to a BSMTP batch file */
484 if (strcmp(ctl->bsmtp, "-") == 0)
487 sinkfp = fopen(ctl->bsmtp, "a");
489 /* see the ap computation under the SMTP branch */
491 "MAIL FROM: %s", (msg->return_path[0]) ? msg->return_path : user);
493 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
494 fputs(" BODY=8BITMIME", sinkfp);
495 else if (ctl->mimemsg & MSG_IS_7BIT)
496 fputs(" BODY=7BIT", sinkfp);
498 fprintf(sinkfp, " SIZE=%d\r\n", msg->reallen);
501 * RFC 1123 requires that the domain name part of the
502 * RCPT TO address be "canonicalized", that is a FQDN
503 * or MX but not a CNAME. Some listeners (like exim)
504 * enforce this. Now that we have the actual hostname,
505 * compute what we should canonicalize with.
507 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
510 for (idp = msg->recipients; idp; idp = idp->next)
511 if (idp->val.status.mark == XMIT_ACCEPT)
513 if (strchr(idp->id, '@'))
515 "RCPT TO: %s\r\n", idp->id);
518 "RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
522 fputs("DATA\r\n", sinkfp);
526 report(stderr, _("BSMTP file open or preamble write failed\n"));
530 else if (ctl->mda) /* we have a declared MDA */
532 int length = 0, fromlen = 0, nameslen = 0;
533 char *names = NULL, *before, *after, *from = NULL;
535 ctl->destaddr = "localhost";
537 for (idp = msg->recipients; idp; idp = idp->next)
538 if (idp->val.status.mark == XMIT_ACCEPT)
541 length = strlen(ctl->mda);
542 before = xstrdup(ctl->mda);
544 /* get user addresses for %T (or %s for backward compatibility) */
545 if (strstr(before, "%s") || strstr(before, "%T"))
548 * We go through this in order to be able to handle very
549 * long lists of users and (re)implement %s.
552 for (idp = msg->recipients; idp; idp = idp->next)
553 if ((idp->val.status.mark == XMIT_ACCEPT))
554 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
555 if ((*good_addresses == 0))
556 nameslen = strlen(run.postmaster);
558 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
559 if (*good_addresses == 0)
560 strcpy(names, run.postmaster);
564 for (idp = msg->recipients; idp; idp = idp->next)
565 if (idp->val.status.mark == XMIT_ACCEPT)
567 strcat(names, idp->id);
570 names[--nameslen] = '\0'; /* chop trailing space */
573 /* sanitize names in order to contain only harmless shell chars */
577 /* get From address for %F */
578 if (strstr(before, "%F"))
580 from = xstrdup(msg->return_path);
582 /* sanitize from in order to contain *only* harmless shell chars */
585 fromlen = strlen(from);
588 /* do we have to build an mda string? */
593 /* find length of resulting mda string */
595 while ((sp = strstr(sp, "%s"))) {
596 length += nameslen - 2; /* subtract %s */
600 while ((sp = strstr(sp, "%T"))) {
601 length += nameslen - 2; /* subtract %T */
605 while ((sp = strstr(sp, "%F"))) {
606 length += fromlen - 2; /* subtract %F */
610 after = xmalloc(length + 1);
612 /* copy mda source string to after, while expanding %[sTF] */
613 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
614 if (sp[0] != '%') continue;
616 /* need to expand? BTW, no here overflow, because in
617 ** the worst case (end of string) sp[1] == '\0' */
618 if (sp[1] == 's' || sp[1] == 'T') {
621 sp++; /* position sp over [sT] */
622 dp--; /* adjust dp */
623 } else if (sp[1] == 'F') {
626 sp++; /* position sp over F */
627 dp--; /* adjust dp */
646 if (outlevel >= O_DEBUG)
647 report(stdout, _("about to deliver with: %s\n"), before);
651 * Arrange to run with user's permissions if we're root.
652 * This will initialize the ownership of any files the
653 * MDA creates properly. (The seteuid call is available
654 * under all BSDs and Linux)
657 #endif /* HAVE_SETEUID */
659 sinkfp = popen(before, "w");
664 /* this will fail quietly if we didn't start as root */
666 #endif /* HAVE_SETEUID */
670 report(stderr, _("MDA open failed\n"));
674 sigchld = signal(SIGCHLD, SIG_DFL);
676 else /* forward to an SMTP or LMTP listener */
679 char options[MSGBUFSIZE];
680 char addr[HOSTLEN+USERNAMELEN+1];
681 char **from_responses;
684 /* build a connection to the SMTP listener */
685 if ((smtp_open(ctl) == -1))
687 report(stderr, _("%cMTP connect to %s failed\n"),
689 ctl->smtphost ? ctl->smtphost : "localhost");
694 * Compute ESMTP options.
697 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
698 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
699 strcpy(options, " BODY=8BITMIME");
700 else if (ctl->mimemsg & MSG_IS_7BIT)
701 strcpy(options, " BODY=7BIT");
704 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
705 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
708 * Try to get the SMTP listener to take the Return-Path
709 * address as MAIL FROM . If it won't, fall back on the
710 * calling-user ID. This won't affect replies, which use the
711 * header From address anyway.
713 * RFC 1123 requires that the domain name part of the
714 * MAIL FROM address be "canonicalized", that is a
715 * FQDN or MX but not a CNAME. We'll assume the From
716 * header is already in this form here (it certainly
717 * is if rewrite is on). RFC 1123 is silent on whether
718 * a nonexistent hostname part is considered canonical.
720 * This is a potential problem if the MTAs further upstream
721 * didn't pass canonicalized From/Return-Path lines, *and* the
722 * local SMTP listener insists on them.
724 ap = (msg->return_path[0]) ? msg->return_path : user;
725 if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
726 return(handle_smtp_report(ctl, msg));
729 * Now list the recipient addressees
732 for (idp = msg->recipients; idp; idp = idp->next)
734 xalloca(from_responses, char **, sizeof(char *) * total_addresses);
735 for (idp = msg->recipients; idp; idp = idp->next)
736 if (idp->val.status.mark == XMIT_ACCEPT)
738 if (strchr(idp->id, '@'))
739 strcpy(addr, idp->id);
742 snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
744 sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
745 #endif /* HAVE_SNPRINTF */
747 if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
751 char errbuf[POPBUFSIZE];
753 strcpy(errbuf, idp->id);
754 strcat(errbuf, ": ");
755 strcat(errbuf, smtp_response);
757 xalloca(from_responses[*bad_addresses],
760 strcpy(from_responses[*bad_addresses], errbuf);
763 idp->val.status.mark = XMIT_RCPTBAD;
764 if (outlevel >= O_VERBOSE)
766 _("%cMTP listener doesn't like recipient address `%s'\n"),
767 ctl->listener, addr);
771 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
772 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
773 *bad_addresses, from_responses);
775 * It's tempting to do local notification only if bouncemail was
776 * insufficient -- that is, to add && total_addresses > *bad_addresses
777 * to the test here. The problem with this theory is that it would
778 * make initial diagnosis of a broken multidrop configuration very
779 * hard -- most single-recipient messages would just invisibly bounce.
781 if (!(*good_addresses))
783 if (strchr(run.postmaster, '@'))
784 strcpy(addr, run.postmaster);
788 snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
790 sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
791 #endif /* HAVE_SNPRINTF */
794 if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
796 report(stderr, _("can't even send to %s!\n"), run.postmaster);
797 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
801 if (outlevel >= O_VERBOSE)
802 report(stderr, _("no address matches; forwarding to %s.\n"), run.postmaster);
806 * Tell the listener we're ready to send data.
807 * Some listeners (like zmailer) may return antispam errors here.
809 if (SMTP_data(ctl->smtp_socket) != SM_OK)
810 return(handle_smtp_report(ctl, msg));
814 * We need to stash this away in order to know how many
815 * response lines to expect after the LMTP end-of-message.
817 lmtp_responses = *good_addresses;
822 void release_sink(struct query *ctl)
823 /* release the per-message output sink, whether it's a pipe or SMTP socket */
832 sinkfp = (FILE *)NULL;
834 signal(SIGCHLD, sigchld);
838 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
839 /* perform end-of-message actions on the current output sink */
845 /* close the delivery pipe, we'll reopen before next message */
849 sinkfp = (FILE *)NULL;
853 signal(SIGCHLD, sigchld);
857 _("MDA exited abnormally or returned nonzero status\n"));
863 /* implicit disk-full check here... */
864 fputs("..\r\n", sinkfp);
865 if (strcmp(ctl->bsmtp, "-"))
870 _("Message termination or close of BSMTP file failed\n"));
876 /* write message terminator */
877 if (SMTP_eom(ctl->smtp_socket) != SM_OK)
879 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
883 report(stderr, _("SMTP listener refused delivery\n"));
889 * If this is an SMTP connection, SMTP_eom() ate the response.
890 * But could be this is an LMTP connection, in which case we have to
891 * interpret either (a) a single 503 response meaning there
892 * were no successful RCPT TOs, or (b) a variable number of
893 * responses, one for each successful RCPT TO. We need to send
894 * bouncemail on each failed response and then return TRUE anyway,
895 * otherwise the message will get left in the queue and resent
896 * to people who got it the first time.
898 if (ctl->listener == LMTP_MODE)
899 if (lmtp_responses == 0)
901 SMTP_ok(ctl->smtp_socket);
904 * According to RFC2033, 503 is the only legal response
905 * if no RCPT TO commands succeeded. No error recovery
906 * is really possible here, as we have no idea what
907 * insane thing the listener might be doing if it doesn't
910 if (atoi(smtp_response) == 503)
911 report(stderr, _("LMTP delivery error on EOM\n"));
914 _("Unexpected non-503 response to LMTP EOM: %s\n"),
918 * It's not completely clear what to do here. We choose to
919 * interpret delivery failure here as a transient error,
920 * the same way SMTP delivery failure is handled. If we're
921 * wrong, an undead message will get stuck in the queue.
930 /* eat the RFC2033-required responses, saving errors */
931 xalloca(responses, char **, sizeof(char *) * lmtp_responses);
932 for (errors = i = 0; i < lmtp_responses; i++)
934 if (SMTP_ok(ctl->smtp_socket) == SM_OK)
935 responses[i] = (char *)NULL;
938 xalloca(responses[errors],
940 strlen(smtp_response)+1);
941 strcpy(responses[errors], smtp_response);
947 return(TRUE); /* all deliveries succeeded */
950 * One or more deliveries failed.
951 * If we can bounce a failures list back to the
952 * sender, and the postmaster does not want to
953 * deal with the bounces return TRUE, deleting the
954 * message from the server so it won't be
955 * re-forwarded on subsequent poll cycles.
957 return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
958 "LSMTP partial delivery failure.\r\n",
966 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
967 /* set up output sink for a mailed warning to calling user */
972 * Dispatching warning email is a little complicated. The problem is
973 * that we have to deal with three distinct cases:
975 * 1. Single-drop running from user account. Warning mail should
976 * go to the local name for which we're collecting (coincides
977 * with calling user).
979 * 2. Single-drop running from root or other privileged ID, with rc
980 * file generated on the fly (Ken Estes's weird setup...) Mail
981 * should go to the local name for which we're collecting (does not
982 * coincide with calling user).
984 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
985 * member null so this message will fall through to run.postmaster.
987 * The zero in the reallen element means we won't pass a SIZE
988 * option to ESMTP; the message length would be more trouble than
989 * it's worth to compute.
991 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
993 strcat(reply.return_path, fetchmailhost);
995 if (!MULTIDROP(ctl)) /* send to calling user */
999 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1000 status = open_sink(ctl, &reply, &good, &bad);
1001 free_str_list(&reply.recipients);
1004 else /* send to postmaster */
1005 return(open_sink(ctl, &reply, &good, &bad));
1008 #if defined(HAVE_STDARG_H)
1009 void stuff_warning(struct query *ctl, const char *fmt, ... )
1011 void stuff_warning(struct query *ctl, fmt, va_alist)
1013 const char *fmt; /* printf-style format */
1016 /* format and ship a warning message line by mail */
1018 char buf[POPBUFSIZE];
1022 * stuffline() requires its input to be writeable (for CR stripping),
1023 * so we needed to copy the message to a writeable buffer anyway in
1024 * case it was a string constant. We make a virtue of that necessity
1025 * here by supporting stdargs/varargs.
1027 #if defined(HAVE_STDARG_H)
1032 #ifdef HAVE_VSNPRINTF
1033 vsnprintf(buf, sizeof(buf), fmt, ap);
1035 vsprintf(buf, fmt, ap);
1039 strcat(buf, "\r\n");
1041 stuffline(ctl, buf);
1044 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1045 /* sign and send mailed warnings */
1047 stuff_warning(ctl, "--\r\n\t\t\t\tThe Fetchmail Daemon\r\n");
1048 close_sink(ctl, msg, TRUE);
1051 /* sink.c ends here */