2 * sink.c -- forwarding/delivery support for fetchmail
4 * The interface of this module (open_sink(), stuff_line(), close_sink(),
5 * release_sink()) seals off the delivery logic from the protocol machine,
6 * so the latter won't have to care whether it's shipping to an [SL]MTP
7 * listener daemon or an MDA pipe.
9 * Copyright 1998 by Eric S. Raymond
10 * For license terms, see the file COPYING in this directory.
21 #endif /* HAVE_MEMORY_H */
22 #if defined(STDC_HEADERS)
25 #if defined(HAVE_UNISTD_H)
28 #if defined(HAVE_STDARG_H)
35 #include "fetchmail.h"
40 /* BSD portability hack...I know, this is an ugly place to put it */
41 #if !defined(SIGCHLD) && defined(SIGCLD)
42 #define SIGCHLD SIGCLD
45 /* makes the open_sink()/close_sink() pair non-reentrant */
46 static int lmtp_responses;
48 static int smtp_open(struct query *ctl)
49 /* try to open a socket to the appropriate SMTP server for this query */
51 /* maybe it's time to close the socket in order to force delivery */
52 if (NUM_NONZERO(ctl->batchlimit) && (ctl->smtp_socket != -1) && ++batchcount == ctl->batchlimit)
54 SockClose(ctl->smtp_socket);
55 ctl->smtp_socket = -1;
59 /* if no socket to any SMTP host is already set up, try to open one */
60 if (ctl->smtp_socket == -1)
63 * RFC 1123 requires that the domain name in HELO address is a
64 * "valid principal domain name" for the client host. If we're
65 * running in invisible mode, violate this with malice
66 * aforethought in order to make the Received headers and
69 * In fact this code relies on the RFC1123 requirement that the
70 * SMTP listener must accept messages even if verification of the
71 * HELO name fails (RFC1123 section 5.2.5, paragraph 2).
73 * How we compute the true mailhost name to pass to the
74 * listener doesn't affect behavior on RFC1123- violating
75 * listeners that check for name match; we're going to lose
76 * on those anyway because we can never give them a name
77 * that matches the local machine fetchmail is running on.
78 * What it will affect is the listener's logging.
81 const char *id_me = run.invisible ? ctl->server.truename : fetchmailhost;
87 * Run down the SMTP hunt list looking for a server that's up.
88 * Use both explicit hunt entries (value TRUE) and implicit
89 * (default) ones (value FALSE).
92 phase = LISTENER_WAIT;
94 set_timeout(ctl->server.timeout);
95 for (idp = ctl->smtphunt; idp; idp = idp->next)
97 char *cp, *parsed_host;
99 char *portnum = SMTP_PORT;
101 int portnum = SMTP_PORT;
102 #endif /* INET6_ENABLE */
104 xalloca(parsed_host, char *, strlen(idp->id) + 1);
106 ctl->smtphost = idp->id; /* remember last host tried. */
108 strcpy(parsed_host, idp->id);
109 if ((cp = strrchr(parsed_host, '/')))
116 #endif /* INET6_ENABLE */
119 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
120 ctl->server.plugout)) == -1)
123 /* are we doing SMTP or LMTP? */
124 SMTP_setmode(ctl->listener);
126 /* first, probe for ESMTP */
127 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
128 SMTP_ehlo(ctl->smtp_socket, id_me,
129 &ctl->server.esmtp_options) == SM_OK)
133 * RFC 1869 warns that some listeners hang up on a failed EHLO,
134 * so it's safest not to assume the socket will still be good.
136 SockClose(ctl->smtp_socket);
137 ctl->smtp_socket = -1;
139 /* if opening for ESMTP failed, try SMTP */
140 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
141 ctl->server.plugout)) == -1)
144 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
145 SMTP_helo(ctl->smtp_socket, id_me) == SM_OK)
148 SockClose(ctl->smtp_socket);
149 ctl->smtp_socket = -1;
156 * RFC 1123 requires that the domain name part of the
157 * RCPT TO address be "canonicalized", that is a FQDN
158 * or MX but not a CNAME. Some listeners (like exim)
159 * enforce this. Now that we have the actual hostname,
160 * compute what we should canonicalize with.
162 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : ( ctl->smtphost ? ctl->smtphost : "localhost");
164 if (outlevel >= O_DEBUG && ctl->smtp_socket != -1)
165 report(stdout, _("forwarding to %s\n"), ctl->smtphost);
167 return(ctl->smtp_socket);
170 /* these are shared by open_sink and stuffline */
172 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.
208 if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
213 /* writing to SMTP, leave the byte-stuffing in place */;
215 else /* if (!protocol->delimited) -- not byte-stuffed already */
218 SockWrite(ctl->smtp_socket, buf, 1); /* byte-stuff it */
220 /* leave it alone */;
224 /* we may need to strip carriage returns */
229 for (sp = tp = buf; sp < last; sp++)
237 if (ctl->mda || ctl->bsmtp)
238 n = fwrite(buf, 1, last - buf, sinkfp);
239 else if (ctl->smtp_socket != -1)
240 n = SockWrite(ctl->smtp_socket, buf, last - buf);
247 static void sanitize(char *s)
248 /* replace unsafe shellchars by an _ */
250 const static char *ok_chars = " 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
253 for (cp = s; *(cp += strspn(cp, ok_chars)); /* NO INCREMENT */)
257 static int send_bouncemail(struct query *ctl, struct msgblk *msg,
258 int userclass, char *message,
259 int nerrors, char *errors[])
260 /* bounce back an error report a la RFC 1892 */
262 char daemon_name[18 + HOSTLEN] = "FETCHMAIL-DAEMON@";
263 char boundary[BUFSIZ], *ts, *bounce_to;
266 /* don't bounce in reply to undeliverable bounces */
267 if (!msg->return_path[0] || strcmp(msg->return_path, "<>") == 0)
270 bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
272 SMTP_setmode(SMTP_MODE);
274 strcat(daemon_name, fetchmailhost);
276 /* we need only SMTP for this purpose */
277 if ((sock = SockOpen("localhost", SMTP_PORT, NULL, NULL)) == -1
278 || SMTP_ok(sock) != SM_OK
279 || SMTP_helo(sock, "localhost") != SM_OK
280 || SMTP_from(sock, daemon_name, (char *)NULL) != SM_OK
281 || SMTP_rcpt(sock, bounce_to) != SM_OK
282 || SMTP_data(sock) != SM_OK)
285 /* our first duty is to keep the sacred foo counters turning... */
287 "foo-mani-padme-hum-%d-%d-%ld",
288 (int)getpid(), (int)getppid(), time((time_t *)NULL));
290 ts = rfc822timestamp();
292 if (outlevel >= O_VERBOSE)
293 report(stdout, "SMTP: (bounce-message body)\n");
295 /* this will usually go to sylog... */
296 report(stderr, "mail from %s bounced to %s\n",
297 daemon_name, bounce_to);
299 /* bouncemail headers */
300 SockPrintf(sock, "Return-Path: <>\r\n");
301 SockPrintf(sock, "From: %s\r\n", daemon_name);
302 SockPrintf(sock, "To: %s\r\n", bounce_to);
303 SockPrintf(sock, "MIME-Version: 1.0\r\n");
304 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
305 SockPrintf(sock, "\r\n");
307 /* RFC1892 part 1 -- human-readable message */
308 SockPrintf(sock, "--%s\r\n", boundary);
309 SockPrintf(sock,"Content-Type: text/plain\r\n");
310 SockPrintf(sock, "\r\n");
311 SockWrite(sock, message, strlen(message));
312 SockPrintf(sock, "\r\n");
313 SockPrintf(sock, "\r\n");
320 /* RFC1892 part 2 -- machine-readable responses */
321 SockPrintf(sock, "--%s\r\n", boundary);
322 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
323 SockPrintf(sock, "\r\n");
324 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fetchmailhost);
327 for (idp = msg->recipients; idp; idp = idp->next)
328 if (idp->val.status.mark == userclass)
331 /* Minimum RFC1894 compliance + Diagnostic-Code field */
332 SockPrintf(sock, "\r\n");
333 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n", idp->id);
334 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", ts);
335 SockPrintf(sock, "Action: failed\r\n");
338 /* one error applies to all users */
340 else if (nerrors > nusers)
342 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
346 /* errors correspond 1-1 to selected users */
347 error = errors[nusers++];
349 if (strlen(error) > 9 && isdigit(error[4])
350 && error[5] == '.' && isdigit(error[6])
351 && error[7] == '.' && isdigit(error[8]))
352 /* Enhanced status code available, use it */
353 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
355 /* Enhanced status code not available, fake one */
356 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
357 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
359 SockPrintf(sock, "\r\n");
362 /* RFC1892 part 3 -- headers of undelivered message */
363 SockPrintf(sock, "--%s\r\n", boundary);
364 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
365 SockPrintf(sock, "\r\n");
366 SockWrite(sock, msg->headers, strlen(msg->headers));
367 SockPrintf(sock, "\r\n");
368 SockPrintf(sock, "--%s--\r\n", boundary);
370 if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
378 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
379 /* handle SMTP errors based on the content of SMTP_response */
380 /* return of PS_REFUSED deletes mail from the server; PS_TRANSIENT keeps it */
382 int smtperr = atoi(smtp_response);
385 xalloca(responses[0], char *, strlen(smtp_response)+1);
386 strcpy(responses[0], smtp_response);
388 SMTP_rset(ctl->smtp_socket); /* stay on the safe site */
390 if (outlevel >= O_DEBUG)
391 report(stdout, "Saved error is still %d\n", smtperr);
394 * Note: send_bouncemail message strings are not made subject
395 * to gettext translation because (a) they're going to be
396 * embedded in a text/plain 7bit part, and (b) they're
397 * going to be associated with listener error-response
398 * messages, which are probably in English (none of the
399 * MTAs I know about are internationalized).
401 if (str_find(&ctl->antispam, smtperr))
404 * SMTP listener explicitly refuses to deliver mail
405 * coming from this address, probably due to an
406 * anti-spam domain exclusion. Respect this. Don't
407 * try to ship the message, and don't prevent it from
408 * being deleted. Default values:
410 * 571 = sendmail's "unsolicited email refused"
411 * 550 = exim's new antispam response (temporary)
412 * 501 = exim's old antispam response
413 * 554 = Postfix antispam response.
416 send_bouncemail(ctl, msg, XMIT_ACCEPT,
417 "Our spam filter rejected this transaction.\r\n",
423 * Suppress error message only if the response specifically
424 * meant `excluded for policy reasons'. We *should* see
425 * an error when the return code is less specific.
428 report(stderr, _("%cMTP error: %s\n"),
434 case 552: /* message exceeds fixed maximum message size */
436 * Permanent no-go condition on the
437 * ESMTP server. Don't try to ship the message,
438 * and allow it to be deleted.
440 send_bouncemail(ctl, msg, XMIT_ACCEPT,
441 "This message was too large (SMTP error 552).\r\n",
443 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
445 case 553: /* invalid sending domain */
447 * These latter days 553 usually means a spammer is trying to
448 * cover his tracks. We never bouncemail on these, because
449 * (a) the return address is invalid by definition, and
450 * (b) we wouldn't want spammers to get confirmation that
451 * this address is live, anyway.
453 send_bouncemail(ctl, msg, XMIT_ACCEPT,
454 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
459 /* bounce non-transient errors back to the sender */
460 if (smtperr >= 500 && smtperr <= 599)
461 if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
462 "General SMTP/ESMTP error.\r\n",
464 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
466 * We're going to end up here on 4xx errors, like:
468 * 451: temporarily unable to identify sender (exim)
469 * 452: temporary out-of-queue-space condition on the ESMTP server.
471 * These are temporary errors. Don't try to ship the message,
472 * and suppress deletion so it can be retried on a future
475 * Bouncemail *might* be appropriate here as a delay
476 * notification (note; if we ever add this, we must make
477 * sure the RFC1894 Action field is "delayed" rather thwn
478 * "failed"). But it's not really necessary because
479 * these are not actual failures, we're very likely to be
480 * able to recover on the next cycle.
482 return(PS_TRANSIENT);
486 int open_sink(struct query *ctl, struct msgblk *msg,
487 int *good_addresses, int *bad_addresses)
488 /* set up sinkfp to be an input sink we can ship a message to */
492 *bad_addresses = *good_addresses = 0;
494 if (ctl->bsmtp) /* dump to a BSMTP batch file */
496 if (strcmp(ctl->bsmtp, "-") == 0)
499 sinkfp = fopen(ctl->bsmtp, "a");
501 /* see the ap computation under the SMTP branch */
503 "MAIL FROM: %s", (msg->return_path[0]) ? msg->return_path : user);
505 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
506 fputs(" BODY=8BITMIME", sinkfp);
507 else if (ctl->mimemsg & MSG_IS_7BIT)
508 fputs(" BODY=7BIT", sinkfp);
510 /* exim's BSMTP processor does not handle SIZE */
511 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
513 fprintf(sinkfp, "\r\n");
516 * RFC 1123 requires that the domain name part of the
517 * RCPT TO address be "canonicalized", that is a FQDN
518 * or MX but not a CNAME. Some listeners (like exim)
519 * enforce this. Now that we have the actual hostname,
520 * compute what we should canonicalize with.
522 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
525 for (idp = msg->recipients; idp; idp = idp->next)
526 if (idp->val.status.mark == XMIT_ACCEPT)
529 fprintf(sinkfp, "RCPT TO: %s\r\n", ctl->smtpname);
530 else if (strchr(idp->id, '@'))
532 "RCPT TO: %s\r\n", idp->id);
535 "RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
539 fputs("DATA\r\n", sinkfp);
543 report(stderr, _("BSMTP file open or preamble write failed\n"));
547 else if (ctl->mda) /* we have a declared MDA */
549 int length = 0, fromlen = 0, nameslen = 0;
550 char *names = NULL, *before, *after, *from = NULL;
552 ctl->destaddr = "localhost";
554 for (idp = msg->recipients; idp; idp = idp->next)
555 if (idp->val.status.mark == XMIT_ACCEPT)
558 length = strlen(ctl->mda);
559 before = xstrdup(ctl->mda);
561 /* get user addresses for %T (or %s for backward compatibility) */
562 if (strstr(before, "%s") || strstr(before, "%T"))
565 * We go through this in order to be able to handle very
566 * long lists of users and (re)implement %s.
569 for (idp = msg->recipients; idp; idp = idp->next)
570 if ((idp->val.status.mark == XMIT_ACCEPT))
571 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
572 if ((*good_addresses == 0))
573 nameslen = strlen(run.postmaster);
575 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
576 if (*good_addresses == 0)
577 strcpy(names, run.postmaster);
581 for (idp = msg->recipients; idp; idp = idp->next)
582 if (idp->val.status.mark == XMIT_ACCEPT)
584 strcat(names, idp->id);
587 names[--nameslen] = '\0'; /* chop trailing space */
590 /* sanitize names in order to contain only harmless shell chars */
594 /* get From address for %F */
595 if (strstr(before, "%F"))
597 from = xstrdup(msg->return_path);
599 /* sanitize from in order to contain *only* harmless shell chars */
602 fromlen = strlen(from);
605 /* do we have to build an mda string? */
610 /* find length of resulting mda string */
612 while ((sp = strstr(sp, "%s"))) {
613 length += nameslen - 2; /* subtract %s */
617 while ((sp = strstr(sp, "%T"))) {
618 length += nameslen - 2; /* subtract %T */
622 while ((sp = strstr(sp, "%F"))) {
623 length += fromlen - 2; /* subtract %F */
627 after = xmalloc(length + 1);
629 /* copy mda source string to after, while expanding %[sTF] */
630 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
631 if (sp[0] != '%') continue;
633 /* need to expand? BTW, no here overflow, because in
634 ** the worst case (end of string) sp[1] == '\0' */
635 if (sp[1] == 's' || sp[1] == 'T') {
638 sp++; /* position sp over [sT] */
639 dp--; /* adjust dp */
640 } else if (sp[1] == 'F') {
643 sp++; /* position sp over F */
644 dp--; /* adjust dp */
663 if (outlevel >= O_DEBUG)
664 report(stdout, _("about to deliver with: %s\n"), before);
668 * Arrange to run with user's permissions if we're root.
669 * This will initialize the ownership of any files the
670 * MDA creates properly. (The seteuid call is available
671 * under all BSDs and Linux)
674 #endif /* HAVE_SETEUID */
676 sinkfp = popen(before, "w");
681 /* this will fail quietly if we didn't start as root */
683 #endif /* HAVE_SETEUID */
687 report(stderr, _("MDA open failed\n"));
691 sigchld = signal(SIGCHLD, SIG_DFL);
693 else /* forward to an SMTP or LMTP listener */
696 char options[MSGBUFSIZE];
697 char addr[HOSTLEN+USERNAMELEN+1];
698 char **from_responses;
701 /* build a connection to the SMTP listener */
702 if ((smtp_open(ctl) == -1))
704 report(stderr, _("%cMTP connect to %s failed\n"),
706 ctl->smtphost ? ctl->smtphost : "localhost");
711 * Compute ESMTP options.
714 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
715 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
716 strcpy(options, " BODY=8BITMIME");
717 else if (ctl->mimemsg & MSG_IS_7BIT)
718 strcpy(options, " BODY=7BIT");
721 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
722 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
725 * Try to get the SMTP listener to take the Return-Path
726 * address as MAIL FROM. If it won't, fall back on the
727 * remotename and mailserver host. This won't affect replies,
728 * which use the header From address anyway; the MAIL FROM
729 * address is a place for the SMTP listener to send
730 * bouncemail. The point is to guarantee a FQDN in the MAIL
731 * FROM line -- some SMTP listeners, like smail, become
734 * RFC 1123 requires that the domain name part of the
735 * MAIL FROM address be "canonicalized", that is a
736 * FQDN or MX but not a CNAME. We'll assume the Return-Path
737 * header is already in this form here (it certainly
738 * is if rewrite is on). RFC 1123 is silent on whether
739 * a nonexistent hostname part is considered canonical.
741 * This is a potential problem if the MTAs further upstream
742 * didn't pass canonicalized From/Return-Path lines, *and* the
743 * local SMTP listener insists on them.
745 if (!msg->return_path[0])
747 sprintf(addr, "%s@%s", ctl->remotename, ctl->server.truename);
750 else if (strchr(msg->return_path, '@'))
751 ap = msg->return_path;
752 else /* in case Return-Path existed but was local */
754 sprintf(addr, "%s@%s", msg->return_path, ctl->server.truename);
758 if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
759 return(handle_smtp_report(ctl, msg));
762 * Now list the recipient addressees
765 for (idp = msg->recipients; idp; idp = idp->next)
767 xalloca(from_responses, char **, sizeof(char *) * total_addresses);
768 for (idp = msg->recipients; idp; idp = idp->next)
769 if (idp->val.status.mark == XMIT_ACCEPT)
771 if (strchr(idp->id, '@'))
772 strcpy(addr, idp->id);
776 snprintf(addr, sizeof(addr)-1, "%s", ctl->smtpname);
778 sprintf(addr, "%s", ctl->smtpname);
779 #endif /* HAVE_SNPRINTF */
783 snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
785 sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
786 #endif /* HAVE_SNPRINTF */
789 if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
793 char errbuf[POPBUFSIZE];
795 strcpy(errbuf, idp->id);
796 strcat(errbuf, ": ");
797 strcat(errbuf, smtp_response);
799 xalloca(from_responses[*bad_addresses],
802 strcpy(from_responses[*bad_addresses], errbuf);
805 idp->val.status.mark = XMIT_RCPTBAD;
806 if (outlevel >= O_VERBOSE)
808 _("%cMTP listener doesn't like recipient address `%s'\n"),
809 ctl->listener, addr);
813 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
814 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
815 *bad_addresses, from_responses);
817 * It's tempting to do local notification only if bouncemail was
818 * insufficient -- that is, to add && total_addresses > *bad_addresses
819 * to the test here. The problem with this theory is that it would
820 * make initial diagnosis of a broken multidrop configuration very
821 * hard -- most single-recipient messages would just invisibly bounce.
823 if (!(*good_addresses))
825 if (strchr(run.postmaster, '@'))
826 strcpy(addr, run.postmaster);
830 snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
832 sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
833 #endif /* HAVE_SNPRINTF */
836 if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
838 report(stderr, _("can't even send to %s!\n"), run.postmaster);
839 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
843 if (outlevel >= O_VERBOSE)
844 report(stderr, _("no address matches; forwarding to %s.\n"), run.postmaster);
848 * Tell the listener we're ready to send data.
849 * Some listeners (like zmailer) may return antispam errors here.
851 if (SMTP_data(ctl->smtp_socket) != SM_OK)
852 return(handle_smtp_report(ctl, msg));
856 * We need to stash this away in order to know how many
857 * response lines to expect after the LMTP end-of-message.
859 lmtp_responses = *good_addresses;
864 void release_sink(struct query *ctl)
865 /* release the per-message output sink, whether it's a pipe or SMTP socket */
874 sinkfp = (FILE *)NULL;
876 signal(SIGCHLD, sigchld);
880 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
881 /* perform end-of-message actions on the current output sink */
887 /* close the delivery pipe, we'll reopen before next message */
891 sinkfp = (FILE *)NULL;
895 signal(SIGCHLD, sigchld);
899 _("MDA exited abnormally or returned nonzero status\n"));
907 /* implicit disk-full check here... */
908 fputs(".\r\n", sinkfp);
909 error = ferror(sinkfp);
910 if (strcmp(ctl->bsmtp, "-"))
911 if (fclose(sinkfp) == EOF) error = 1;
915 _("Message termination or close of BSMTP file failed\n"));
921 /* write message terminator */
922 if (SMTP_eom(ctl->smtp_socket) != SM_OK)
924 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
928 report(stderr, _("SMTP listener refused delivery\n"));
934 * If this is an SMTP connection, SMTP_eom() ate the response.
935 * But could be this is an LMTP connection, in which case we have to
936 * interpret either (a) a single 503 response meaning there
937 * were no successful RCPT TOs, or (b) a variable number of
938 * responses, one for each successful RCPT TO. We need to send
939 * bouncemail on each failed response and then return TRUE anyway,
940 * otherwise the message will get left in the queue and resent
941 * to people who got it the first time.
943 if (ctl->listener == LMTP_MODE)
945 if (lmtp_responses == 0)
947 SMTP_ok(ctl->smtp_socket);
950 * According to RFC2033, 503 is the only legal response
951 * if no RCPT TO commands succeeded. No error recovery
952 * is really possible here, as we have no idea what
953 * insane thing the listener might be doing if it doesn't
956 if (atoi(smtp_response) == 503)
957 report(stderr, _("LMTP delivery error on EOM\n"));
960 _("Unexpected non-503 response to LMTP EOM: %s\n"),
964 * It's not completely clear what to do here. We choose to
965 * interpret delivery failure here as a transient error,
966 * the same way SMTP delivery failure is handled. If we're
967 * wrong, an undead message will get stuck in the queue.
976 /* eat the RFC2033-required responses, saving errors */
977 xalloca(responses, char **, sizeof(char *) * lmtp_responses);
978 for (errors = i = 0; i < lmtp_responses; i++)
980 if (SMTP_ok(ctl->smtp_socket) == SM_OK)
981 responses[i] = (char *)NULL;
984 xalloca(responses[errors],
986 strlen(smtp_response)+1);
987 strcpy(responses[errors], smtp_response);
993 return(TRUE); /* all deliveries succeeded */
996 * One or more deliveries failed.
997 * If we can bounce a failures list back to the
998 * sender, and the postmaster does not want to
999 * deal with the bounces return TRUE, deleting the
1000 * message from the server so it won't be
1001 * re-forwarded on subsequent poll cycles.
1003 return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
1004 "LSMTP partial delivery failure.\r\n",
1005 errors, responses));
1013 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
1014 /* set up output sink for a mailed warning to calling user */
1019 * Dispatching warning email is a little complicated. The problem is
1020 * that we have to deal with three distinct cases:
1022 * 1. Single-drop running from user account. Warning mail should
1023 * go to the local name for which we're collecting (coincides
1024 * with calling user).
1026 * 2. Single-drop running from root or other privileged ID, with rc
1027 * file generated on the fly (Ken Estes's weird setup...) Mail
1028 * should go to the local name for which we're collecting (does not
1029 * coincide with calling user).
1031 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1032 * member null so this message will fall through to run.postmaster.
1034 * The zero in the reallen element means we won't pass a SIZE
1035 * option to ESMTP; the message length would be more trouble than
1036 * it's worth to compute.
1038 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
1040 strcat(reply.return_path, fetchmailhost);
1042 if (!MULTIDROP(ctl)) /* send to calling user */
1046 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1047 status = open_sink(ctl, &reply, &good, &bad);
1048 free_str_list(&reply.recipients);
1051 else /* send to postmaster */
1052 return(open_sink(ctl, &reply, &good, &bad));
1055 #if defined(HAVE_STDARG_H)
1056 void stuff_warning(struct query *ctl, const char *fmt, ... )
1058 void stuff_warning(struct query *ctl, fmt, va_alist)
1060 const char *fmt; /* printf-style format */
1063 /* format and ship a warning message line by mail */
1065 char buf[POPBUFSIZE];
1069 * stuffline() requires its input to be writeable (for CR stripping),
1070 * so we needed to copy the message to a writeable buffer anyway in
1071 * case it was a string constant. We make a virtue of that necessity
1072 * here by supporting stdargs/varargs.
1074 #if defined(HAVE_STDARG_H)
1079 #ifdef HAVE_VSNPRINTF
1080 vsnprintf(buf, sizeof(buf), fmt, ap);
1082 vsprintf(buf, fmt, ap);
1086 strcat(buf, "\r\n");
1088 stuffline(ctl, buf);
1091 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1092 /* sign and send mailed warnings */
1094 stuff_warning(ctl, "--\r\n\t\t\t\tThe Fetchmail Daemon\r\n");
1095 close_sink(ctl, msg, TRUE);
1098 /* sink.c ends here */