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 #ifndef HAVE_SIGACTION
173 static RETSIGTYPE (*sigchld)(int);
175 static struct sigaction sa_old;
176 #endif /* HAVE_SIGACTION */
178 int stuffline(struct query *ctl, char *buf)
179 /* ship a line to the given control block's output sink (SMTP server or MDA) */
184 /* The line may contain NUL characters. Find the last char to use
185 * -- the real line termination is the sequence "\n\0".
188 while ((last += strlen(last)) && (last[-1] != '\n'))
191 /* fix message lines that have only \n termination (for qmail) */
194 if (last - 1 == buf || last[-2] != '\r')
203 phase = FORWARDING_WAIT;
206 * SMTP byte-stuffing. We only do this if the protocol does *not*
207 * use .<CR><LF> as EOM. If it does, the server will already have
208 * decorated any . lines it sends back up.
212 if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
217 /* writing to SMTP, leave the byte-stuffing in place */;
219 else /* if (!protocol->delimited) -- not byte-stuffed already */
222 SockWrite(ctl->smtp_socket, buf, 1); /* byte-stuff it */
224 /* leave it alone */;
228 /* we may need to strip carriage returns */
233 for (sp = tp = buf; sp < last; sp++)
241 if (ctl->mda || ctl->bsmtp)
242 n = fwrite(buf, 1, last - buf, sinkfp);
243 else if (ctl->smtp_socket != -1)
244 n = SockWrite(ctl->smtp_socket, buf, last - buf);
251 static void sanitize(char *s)
252 /* replace unsafe shellchars by an _ */
254 const static char *ok_chars = " 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
257 for (cp = s; *(cp += strspn(cp, ok_chars)); /* NO INCREMENT */)
261 static int send_bouncemail(struct query *ctl, struct msgblk *msg,
262 int userclass, char *message,
263 int nerrors, char *errors[])
264 /* bounce back an error report a la RFC 1892 */
266 char daemon_name[18 + HOSTLEN] = "FETCHMAIL-DAEMON@";
267 char boundary[BUFSIZ], *bounce_to;
270 /* don't bounce in reply to undeliverable bounces */
271 if (!msg->return_path[0] || strcmp(msg->return_path, "<>") == 0)
274 bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
276 SMTP_setmode(SMTP_MODE);
278 strcat(daemon_name, fetchmailhost);
280 /* we need only SMTP for this purpose */
281 if ((sock = SockOpen("localhost", SMTP_PORT, NULL, NULL)) == -1
282 || SMTP_ok(sock) != SM_OK
283 || SMTP_helo(sock, "localhost") != SM_OK
284 || SMTP_from(sock, daemon_name, (char *)NULL) != SM_OK
285 || SMTP_rcpt(sock, bounce_to) != SM_OK
286 || SMTP_data(sock) != SM_OK)
289 /* our first duty is to keep the sacred foo counters turning... */
291 "foo-mani-padme-hum-%d-%d-%ld",
292 (int)getpid(), (int)getppid(), time((time_t *)NULL));
294 if (outlevel >= O_VERBOSE)
295 report(stdout, _("SMTP: (bounce-message body)\n"));
297 /* this will usually go to sylog... */
298 report(stderr, _("mail from %s bounced to %s\n"),
299 daemon_name, bounce_to);
301 /* bouncemail headers */
302 SockPrintf(sock, "Return-Path: <>\r\n");
303 SockPrintf(sock, "From: %s\r\n", daemon_name);
304 SockPrintf(sock, "To: %s\r\n", bounce_to);
305 SockPrintf(sock, "MIME-Version: 1.0\r\n");
306 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
307 SockPrintf(sock, "\r\n");
309 /* RFC1892 part 1 -- human-readable message */
310 SockPrintf(sock, "--%s\r\n", boundary);
311 SockPrintf(sock,"Content-Type: text/plain\r\n");
312 SockPrintf(sock, "\r\n");
313 SockWrite(sock, message, strlen(message));
314 SockPrintf(sock, "\r\n");
315 SockPrintf(sock, "\r\n");
322 /* RFC1892 part 2 -- machine-readable responses */
323 SockPrintf(sock, "--%s\r\n", boundary);
324 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
325 SockPrintf(sock, "\r\n");
326 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fetchmailhost);
329 for (idp = msg->recipients; idp; idp = idp->next)
330 if (idp->val.status.mark == userclass)
333 /* Minimum RFC1894 compliance + Diagnostic-Code field */
334 SockPrintf(sock, "\r\n");
335 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n", idp->id);
336 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", rfc822timestamp());
337 SockPrintf(sock, "Action: failed\r\n");
340 /* one error applies to all users */
342 else if (nerrors > nusers)
344 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
348 /* errors correspond 1-1 to selected users */
349 error = errors[nusers++];
351 if (strlen(error) > 9 && isdigit(error[4])
352 && error[5] == '.' && isdigit(error[6])
353 && error[7] == '.' && isdigit(error[8]))
354 /* Enhanced status code available, use it */
355 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
357 /* Enhanced status code not available, fake one */
358 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
359 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
361 SockPrintf(sock, "\r\n");
364 /* RFC1892 part 3 -- headers of undelivered message */
365 SockPrintf(sock, "--%s\r\n", boundary);
366 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
367 SockPrintf(sock, "\r\n");
368 SockWrite(sock, msg->headers, strlen(msg->headers));
369 SockPrintf(sock, "\r\n");
370 SockPrintf(sock, "--%s--\r\n", boundary);
372 if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
380 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
381 /* handle SMTP errors based on the content of SMTP_response */
382 /* return of PS_REFUSED deletes mail from the server; PS_TRANSIENT keeps it */
384 int smtperr = atoi(smtp_response);
387 xalloca(responses[0], char *, strlen(smtp_response)+1);
388 strcpy(responses[0], smtp_response);
390 SMTP_rset(ctl->smtp_socket); /* stay on the safe site */
392 if (outlevel >= O_DEBUG)
393 report(stdout, _("Saved error is still %d\n"), smtperr);
396 * Note: send_bouncemail message strings are not made subject
397 * to gettext translation because (a) they're going to be
398 * embedded in a text/plain 7bit part, and (b) they're
399 * going to be associated with listener error-response
400 * messages, which are probably in English (none of the
401 * MTAs I know about are internationalized).
403 if (str_find(&ctl->antispam, smtperr))
406 * SMTP listener explicitly refuses to deliver mail
407 * coming from this address, probably due to an
408 * anti-spam domain exclusion. Respect this. Don't
409 * try to ship the message, and don't prevent it from
410 * being deleted. Default values:
412 * 571 = sendmail's "unsolicited email refused"
413 * 550 = exim's new antispam response (temporary)
414 * 501 = exim's old antispam response
415 * 554 = Postfix antispam response.
418 send_bouncemail(ctl, msg, XMIT_ACCEPT,
419 "Our spam filter rejected this transaction.\r\n",
425 * Suppress error message only if the response specifically
426 * meant `excluded for policy reasons'. We *should* see
427 * an error when the return code is less specific.
430 report(stderr, _("%cMTP error: %s\n"),
436 case 552: /* message exceeds fixed maximum message size */
438 * Permanent no-go condition on the
439 * ESMTP server. Don't try to ship the message,
440 * and allow it to be deleted.
442 send_bouncemail(ctl, msg, XMIT_ACCEPT,
443 "This message was too large (SMTP error 552).\r\n",
445 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
447 case 553: /* invalid sending domain */
449 * These latter days 553 usually means a spammer is trying to
450 * cover his tracks. We never bouncemail on these, because
451 * (a) the return address is invalid by definition, and
452 * (b) we wouldn't want spammers to get confirmation that
453 * this address is live, anyway.
455 send_bouncemail(ctl, msg, XMIT_ACCEPT,
456 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
461 /* bounce non-transient errors back to the sender */
462 if (smtperr >= 500 && smtperr <= 599)
463 if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
464 "General SMTP/ESMTP error.\r\n",
466 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
468 * We're going to end up here on 4xx errors, like:
470 * 451: temporarily unable to identify sender (exim)
471 * 452: temporary out-of-queue-space condition on the ESMTP server.
473 * These are temporary errors. Don't try to ship the message,
474 * and suppress deletion so it can be retried on a future
477 * Bouncemail *might* be appropriate here as a delay
478 * notification (note; if we ever add this, we must make
479 * sure the RFC1894 Action field is "delayed" rather thwn
480 * "failed"). But it's not really necessary because
481 * these are not actual failures, we're very likely to be
482 * able to recover on the next cycle.
484 return(PS_TRANSIENT);
488 int open_sink(struct query *ctl, struct msgblk *msg,
489 int *good_addresses, int *bad_addresses)
490 /* set up sinkfp to be an input sink we can ship a message to */
493 #ifdef HAVE_SIGACTION
494 struct sigaction sa_new;
495 #endif /* HAVE_SIGACTION */
497 *bad_addresses = *good_addresses = 0;
499 if (ctl->bsmtp) /* dump to a BSMTP batch file */
501 if (strcmp(ctl->bsmtp, "-") == 0)
504 sinkfp = fopen(ctl->bsmtp, "a");
506 /* see the ap computation under the SMTP branch */
508 "MAIL FROM: %s", (msg->return_path[0]) ? msg->return_path : user);
510 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
511 fputs(" BODY=8BITMIME", sinkfp);
512 else if (ctl->mimemsg & MSG_IS_7BIT)
513 fputs(" BODY=7BIT", sinkfp);
515 /* exim's BSMTP processor does not handle SIZE */
516 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
518 fprintf(sinkfp, "\r\n");
521 * RFC 1123 requires that the domain name part of the
522 * RCPT TO address be "canonicalized", that is a FQDN
523 * or MX but not a CNAME. Some listeners (like exim)
524 * enforce this. Now that we have the actual hostname,
525 * compute what we should canonicalize with.
527 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
530 for (idp = msg->recipients; idp; idp = idp->next)
531 if (idp->val.status.mark == XMIT_ACCEPT)
534 fprintf(sinkfp, "RCPT TO: %s\r\n", ctl->smtpname);
535 else if (strchr(idp->id, '@'))
537 "RCPT TO: %s\r\n", idp->id);
540 "RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
544 fputs("DATA\r\n", sinkfp);
548 report(stderr, _("BSMTP file open or preamble write failed\n"));
552 else if (ctl->mda) /* we have a declared MDA */
554 int length = 0, fromlen = 0, nameslen = 0;
555 char *names = NULL, *before, *after, *from = NULL;
557 ctl->destaddr = "localhost";
559 for (idp = msg->recipients; idp; idp = idp->next)
560 if (idp->val.status.mark == XMIT_ACCEPT)
563 length = strlen(ctl->mda);
564 before = xstrdup(ctl->mda);
566 /* get user addresses for %T (or %s for backward compatibility) */
567 if (strstr(before, "%s") || strstr(before, "%T"))
570 * We go through this in order to be able to handle very
571 * long lists of users and (re)implement %s.
574 for (idp = msg->recipients; idp; idp = idp->next)
575 if ((idp->val.status.mark == XMIT_ACCEPT))
576 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
577 if ((*good_addresses == 0))
578 nameslen = strlen(run.postmaster);
580 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
581 if (*good_addresses == 0)
582 strcpy(names, run.postmaster);
586 for (idp = msg->recipients; idp; idp = idp->next)
587 if (idp->val.status.mark == XMIT_ACCEPT)
589 strcat(names, idp->id);
592 names[--nameslen] = '\0'; /* chop trailing space */
595 /* sanitize names in order to contain only harmless shell chars */
599 /* get From address for %F */
600 if (strstr(before, "%F"))
602 from = xstrdup(msg->return_path);
604 /* sanitize from in order to contain *only* harmless shell chars */
607 fromlen = strlen(from);
610 /* do we have to build an mda string? */
615 /* find length of resulting mda string */
617 while ((sp = strstr(sp, "%s"))) {
618 length += nameslen - 2; /* subtract %s */
622 while ((sp = strstr(sp, "%T"))) {
623 length += nameslen - 2; /* subtract %T */
627 while ((sp = strstr(sp, "%F"))) {
628 length += fromlen - 2; /* subtract %F */
632 after = xmalloc(length + 1);
634 /* copy mda source string to after, while expanding %[sTF] */
635 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
636 if (sp[0] != '%') continue;
638 /* need to expand? BTW, no here overflow, because in
639 ** the worst case (end of string) sp[1] == '\0' */
640 if (sp[1] == 's' || sp[1] == 'T') {
643 sp++; /* position sp over [sT] */
644 dp--; /* adjust dp */
645 } else if (sp[1] == 'F') {
648 sp++; /* position sp over F */
649 dp--; /* adjust dp */
668 if (outlevel >= O_DEBUG)
669 report(stdout, _("about to deliver with: %s\n"), before);
673 * Arrange to run with user's permissions if we're root.
674 * This will initialize the ownership of any files the
675 * MDA creates properly. (The seteuid call is available
676 * under all BSDs and Linux)
679 #endif /* HAVE_SETEUID */
681 sinkfp = popen(before, "w");
686 /* this will fail quietly if we didn't start as root */
688 #endif /* HAVE_SETEUID */
692 report(stderr, _("MDA open failed\n"));
696 #ifndef HAVE_SIGACTION
697 sigchld = signal(SIGCHLD, SIG_DFL);
699 memset (&sa_new, 0, sizeof sa_new);
700 sigemptyset (&sa_new.sa_mask);
701 sa_new.sa_handler = SIG_DFL;
702 sigaction (SIGCHLD, &sa_new, &sa_old);
703 #endif /* HAVE_SIGACTION */
705 else /* forward to an SMTP or LMTP listener */
708 char options[MSGBUFSIZE];
709 char addr[HOSTLEN+USERNAMELEN+1];
710 char **from_responses;
713 /* build a connection to the SMTP listener */
714 if ((smtp_open(ctl) == -1))
716 report(stderr, _("%cMTP connect to %s failed\n"),
718 ctl->smtphost ? ctl->smtphost : "localhost");
723 * Compute ESMTP options.
726 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
727 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
728 strcpy(options, " BODY=8BITMIME");
729 else if (ctl->mimemsg & MSG_IS_7BIT)
730 strcpy(options, " BODY=7BIT");
733 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
734 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
737 * Try to get the SMTP listener to take the Return-Path
738 * address as MAIL FROM. If it won't, fall back on the
739 * remotename and mailserver host. This won't affect replies,
740 * which use the header From address anyway; the MAIL FROM
741 * address is a place for the SMTP listener to send
742 * bouncemail. The point is to guarantee a FQDN in the MAIL
743 * FROM line -- some SMTP listeners, like smail, become
746 * RFC 1123 requires that the domain name part of the
747 * MAIL FROM address be "canonicalized", that is a
748 * FQDN or MX but not a CNAME. We'll assume the Return-Path
749 * header is already in this form here (it certainly
750 * is if rewrite is on). RFC 1123 is silent on whether
751 * a nonexistent hostname part is considered canonical.
753 * This is a potential problem if the MTAs further upstream
754 * didn't pass canonicalized From/Return-Path lines, *and* the
755 * local SMTP listener insists on them.
757 if (!msg->return_path[0])
759 sprintf(addr, "%s@%s", ctl->remotename, ctl->server.truename);
762 else if (strchr(msg->return_path, '@'))
763 ap = msg->return_path;
764 else /* in case Return-Path existed but was local */
766 sprintf(addr, "%s@%s", msg->return_path, ctl->server.truename);
770 if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
771 return(handle_smtp_report(ctl, msg));
774 * Now list the recipient addressees
777 for (idp = msg->recipients; idp; idp = idp->next)
779 xalloca(from_responses, char **, sizeof(char *) * total_addresses);
780 for (idp = msg->recipients; idp; idp = idp->next)
781 if (idp->val.status.mark == XMIT_ACCEPT)
783 if (strchr(idp->id, '@'))
784 strcpy(addr, idp->id);
788 snprintf(addr, sizeof(addr)-1, "%s", ctl->smtpname);
790 sprintf(addr, "%s", ctl->smtpname);
791 #endif /* HAVE_SNPRINTF */
795 snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
797 sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
798 #endif /* HAVE_SNPRINTF */
801 if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
805 char errbuf[POPBUFSIZE];
807 strcpy(errbuf, idp->id);
808 strcat(errbuf, ": ");
809 strcat(errbuf, smtp_response);
811 xalloca(from_responses[*bad_addresses],
814 strcpy(from_responses[*bad_addresses], errbuf);
817 idp->val.status.mark = XMIT_RCPTBAD;
818 if (outlevel >= O_VERBOSE)
820 _("%cMTP listener doesn't like recipient address `%s'\n"),
821 ctl->listener, addr);
825 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
826 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
827 *bad_addresses, from_responses);
829 * It's tempting to do local notification only if bouncemail was
830 * insufficient -- that is, to add && total_addresses > *bad_addresses
831 * to the test here. The problem with this theory is that it would
832 * make initial diagnosis of a broken multidrop configuration very
833 * hard -- most single-recipient messages would just invisibly bounce.
835 if (!(*good_addresses))
837 if (strchr(run.postmaster, '@'))
838 strcpy(addr, run.postmaster);
842 snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
844 sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
845 #endif /* HAVE_SNPRINTF */
848 if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
850 report(stderr, _("can't even send to %s!\n"), run.postmaster);
851 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
855 if (outlevel >= O_VERBOSE)
856 report(stderr, _("no address matches; forwarding to %s.\n"), run.postmaster);
860 * Tell the listener we're ready to send data.
861 * Some listeners (like zmailer) may return antispam errors here.
863 if (SMTP_data(ctl->smtp_socket) != SM_OK)
864 return(handle_smtp_report(ctl, msg));
868 * We need to stash this away in order to know how many
869 * response lines to expect after the LMTP end-of-message.
871 lmtp_responses = *good_addresses;
876 void release_sink(struct query *ctl)
877 /* release the per-message output sink, whether it's a pipe or SMTP socket */
886 sinkfp = (FILE *)NULL;
888 #ifndef HAVE_SIGACTION
889 signal(SIGCHLD, sigchld);
891 sigaction (SIGCHLD, &sa_old, NULL);
892 #endif /* HAVE_SIGACTION */
896 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
897 /* perform end-of-message actions on the current output sink */
903 /* close the delivery pipe, we'll reopen before next message */
907 sinkfp = (FILE *)NULL;
911 #ifndef HAVE_SIGACTION
912 signal(SIGCHLD, sigchld);
914 sigaction (SIGCHLD, &sa_old, NULL);
915 #endif /* HAVE_SIGACTION */
919 _("MDA exited abnormally or returned nonzero status\n"));
927 /* implicit disk-full check here... */
928 fputs(".\r\n", sinkfp);
929 error = ferror(sinkfp);
930 if (strcmp(ctl->bsmtp, "-"))
931 if (fclose(sinkfp) == EOF) error = 1;
935 _("Message termination or close of BSMTP file failed\n"));
941 /* write message terminator */
942 if (SMTP_eom(ctl->smtp_socket) != SM_OK)
944 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
948 report(stderr, _("SMTP listener refused delivery\n"));
954 * If this is an SMTP connection, SMTP_eom() ate the response.
955 * But could be this is an LMTP connection, in which case we have to
956 * interpret either (a) a single 503 response meaning there
957 * were no successful RCPT TOs, or (b) a variable number of
958 * responses, one for each successful RCPT TO. We need to send
959 * bouncemail on each failed response and then return TRUE anyway,
960 * otherwise the message will get left in the queue and resent
961 * to people who got it the first time.
963 if (ctl->listener == LMTP_MODE)
965 if (lmtp_responses == 0)
967 SMTP_ok(ctl->smtp_socket);
970 * According to RFC2033, 503 is the only legal response
971 * if no RCPT TO commands succeeded. No error recovery
972 * is really possible here, as we have no idea what
973 * insane thing the listener might be doing if it doesn't
976 if (atoi(smtp_response) == 503)
977 report(stderr, _("LMTP delivery error on EOM\n"));
980 _("Unexpected non-503 response to LMTP EOM: %s\n"),
984 * It's not completely clear what to do here. We choose to
985 * interpret delivery failure here as a transient error,
986 * the same way SMTP delivery failure is handled. If we're
987 * wrong, an undead message will get stuck in the queue.
996 /* eat the RFC2033-required responses, saving errors */
997 xalloca(responses, char **, sizeof(char *) * lmtp_responses);
998 for (errors = i = 0; i < lmtp_responses; i++)
1000 if (SMTP_ok(ctl->smtp_socket) == SM_OK)
1001 responses[i] = (char *)NULL;
1004 xalloca(responses[errors],
1006 strlen(smtp_response)+1);
1007 strcpy(responses[errors], smtp_response);
1013 return(TRUE); /* all deliveries succeeded */
1016 * One or more deliveries failed.
1017 * If we can bounce a failures list back to the
1018 * sender, and the postmaster does not want to
1019 * deal with the bounces return TRUE, deleting the
1020 * message from the server so it won't be
1021 * re-forwarded on subsequent poll cycles.
1023 return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
1024 "LSMTP partial delivery failure.\r\n",
1025 errors, responses));
1033 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
1034 /* set up output sink for a mailed warning to calling user */
1039 * Dispatching warning email is a little complicated. The problem is
1040 * that we have to deal with three distinct cases:
1042 * 1. Single-drop running from user account. Warning mail should
1043 * go to the local name for which we're collecting (coincides
1044 * with calling user).
1046 * 2. Single-drop running from root or other privileged ID, with rc
1047 * file generated on the fly (Ken Estes's weird setup...) Mail
1048 * should go to the local name for which we're collecting (does not
1049 * coincide with calling user).
1051 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1052 * member null so this message will fall through to run.postmaster.
1054 * The zero in the reallen element means we won't pass a SIZE
1055 * option to ESMTP; the message length would be more trouble than
1056 * it's worth to compute.
1058 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
1060 strcat(reply.return_path, fetchmailhost);
1062 if (!MULTIDROP(ctl)) /* send to calling user */
1066 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1067 status = open_sink(ctl, &reply, &good, &bad);
1068 free_str_list(&reply.recipients);
1071 else /* send to postmaster */
1072 return(open_sink(ctl, &reply, &good, &bad));
1075 #if defined(HAVE_STDARG_H)
1076 void stuff_warning(struct query *ctl, const char *fmt, ... )
1078 void stuff_warning(struct query *ctl, fmt, va_alist)
1080 const char *fmt; /* printf-style format */
1083 /* format and ship a warning message line by mail */
1085 char buf[POPBUFSIZE];
1089 * stuffline() requires its input to be writeable (for CR stripping),
1090 * so we needed to copy the message to a writeable buffer anyway in
1091 * case it was a string constant. We make a virtue of that necessity
1092 * here by supporting stdargs/varargs.
1094 #if defined(HAVE_STDARG_H)
1099 #ifdef HAVE_VSNPRINTF
1100 vsnprintf(buf, sizeof(buf), fmt, ap);
1102 vsprintf(buf, fmt, ap);
1106 strcat(buf, "\r\n");
1108 stuffline(ctl, buf);
1111 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1112 /* sign and send mailed warnings */
1114 stuff_warning(ctl, _("--\r\n\t\t\t\tThe Fetchmail Daemon\r\n"));
1115 close_sink(ctl, msg, TRUE);
1118 /* sink.c ends here */