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 */
183 #ifndef HAVE_SIGACTION
184 static RETSIGTYPE (*sigchld)(int);
186 static struct sigaction sa_old;
187 #endif /* HAVE_SIGACTION */
189 int stuffline(struct query *ctl, char *buf)
190 /* ship a line to the given control block's output sink (SMTP server or MDA) */
195 /* The line may contain NUL characters. Find the last char to use
196 * -- the real line termination is the sequence "\n\0".
199 while ((last += strlen(last)) && (last[-1] != '\n'))
202 /* fix message lines that have only \n termination (for qmail) */
205 if (last - 1 == buf || last[-2] != '\r')
214 phase = FORWARDING_WAIT;
217 * SMTP byte-stuffing. We only do this if the protocol does *not*
218 * use .<CR><LF> as EOM. If it does, the server will already have
219 * decorated any . lines it sends back up.
223 if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
228 /* writing to SMTP, leave the byte-stuffing in place */;
230 else /* if (!protocol->delimited) -- not byte-stuffed already */
233 SockWrite(ctl->smtp_socket, buf, 1); /* byte-stuff it */
235 /* leave it alone */;
239 /* we may need to strip carriage returns */
244 for (sp = tp = buf; sp < last; sp++)
252 if (ctl->mda || ctl->bsmtp)
253 n = fwrite(buf, 1, last - buf, sinkfp);
254 else if (ctl->smtp_socket != -1)
255 n = SockWrite(ctl->smtp_socket, buf, last - buf);
262 static void sanitize(char *s)
263 /* replace unsafe shellchars by an _ */
265 const static char *ok_chars = " 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
268 for (cp = s; *(cp += strspn(cp, ok_chars)); /* NO INCREMENT */)
272 static int send_bouncemail(struct query *ctl, struct msgblk *msg,
273 int userclass, char *message,
274 int nerrors, char *errors[])
275 /* bounce back an error report a la RFC 1892 */
277 char daemon_name[18 + HOSTLEN] = "FETCHMAIL-DAEMON@";
278 char boundary[BUFSIZ], *bounce_to;
281 /* don't bounce in reply to undeliverable bounces */
282 if (!msg->return_path[0] || strcmp(msg->return_path, "<>") == 0)
285 bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
287 SMTP_setmode(SMTP_MODE);
289 strcat(daemon_name, fetchmailhost);
291 /* we need only SMTP for this purpose */
292 if ((sock = SockOpen("localhost", SMTP_PORT, NULL, NULL)) == -1
293 || SMTP_ok(sock) != SM_OK
294 || SMTP_helo(sock, "localhost") != SM_OK
295 || SMTP_from(sock, daemon_name, (char *)NULL) != SM_OK
296 || SMTP_rcpt(sock, bounce_to) != SM_OK
297 || SMTP_data(sock) != SM_OK)
300 /* our first duty is to keep the sacred foo counters turning... */
302 snprintf(boundary, sizeof(boundary),
305 #endif /* HAVE_SNPRINTF */
306 "foo-mani-padme-hum-%d-%d-%ld",
307 (int)getpid(), (int)getppid(), time((time_t *)NULL));
309 if (outlevel >= O_VERBOSE)
310 report(stdout, _("SMTP: (bounce-message body)\n"));
312 /* this will usually go to sylog... */
313 report(stderr, _("mail from %s bounced to %s\n"),
314 daemon_name, bounce_to);
316 /* bouncemail headers */
317 SockPrintf(sock, "Return-Path: <>\r\n");
318 SockPrintf(sock, "From: %s\r\n", daemon_name);
319 SockPrintf(sock, "To: %s\r\n", bounce_to);
320 SockPrintf(sock, "MIME-Version: 1.0\r\n");
321 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
322 SockPrintf(sock, "\r\n");
324 /* RFC1892 part 1 -- human-readable message */
325 SockPrintf(sock, "--%s\r\n", boundary);
326 SockPrintf(sock,"Content-Type: text/plain\r\n");
327 SockPrintf(sock, "\r\n");
328 SockWrite(sock, message, strlen(message));
329 SockPrintf(sock, "\r\n");
330 SockPrintf(sock, "\r\n");
337 /* RFC1892 part 2 -- machine-readable responses */
338 SockPrintf(sock, "--%s\r\n", boundary);
339 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
340 SockPrintf(sock, "\r\n");
341 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fetchmailhost);
344 for (idp = msg->recipients; idp; idp = idp->next)
345 if (idp->val.status.mark == userclass)
348 /* Minimum RFC1894 compliance + Diagnostic-Code field */
349 SockPrintf(sock, "\r\n");
350 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n", idp->id);
351 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", rfc822timestamp());
352 SockPrintf(sock, "Action: failed\r\n");
355 /* one error applies to all users */
357 else if (nerrors > nusers)
359 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
363 /* errors correspond 1-1 to selected users */
364 error = errors[nusers++];
366 if (strlen(error) > 9 && isdigit(error[4])
367 && error[5] == '.' && isdigit(error[6])
368 && error[7] == '.' && isdigit(error[8]))
369 /* Enhanced status code available, use it */
370 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
372 /* Enhanced status code not available, fake one */
373 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
374 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
376 SockPrintf(sock, "\r\n");
379 /* RFC1892 part 3 -- headers of undelivered message */
380 SockPrintf(sock, "--%s\r\n", boundary);
381 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
382 SockPrintf(sock, "\r\n");
383 SockWrite(sock, msg->headers, strlen(msg->headers));
384 SockPrintf(sock, "\r\n");
385 SockPrintf(sock, "--%s--\r\n", boundary);
387 if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
395 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
396 /* handle SMTP errors based on the content of SMTP_response */
397 /* return of PS_REFUSED deletes mail from the server; PS_TRANSIENT keeps it */
399 int smtperr = atoi(smtp_response);
402 xalloca(responses[0], char *, strlen(smtp_response)+1);
403 strcpy(responses[0], smtp_response);
407 * Don't do this! It can really mess you up if, for example, you're
408 * reporting an error with a single RCPT TO address among several;
409 * RSET discards the message body and it doesn't get sent to the
412 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
413 if (outlevel >= O_DEBUG)
414 report(stdout, _("Saved error is still %d\n"), smtperr);
415 #endif /* __UNUSED */
418 * Note: send_bouncemail message strings are not made subject
419 * to gettext translation because (a) they're going to be
420 * embedded in a text/plain 7bit part, and (b) they're
421 * going to be associated with listener error-response
422 * messages, which are probably in English (none of the
423 * MTAs I know about are internationalized).
425 if (str_find(&ctl->antispam, smtperr))
428 * SMTP listener explicitly refuses to deliver mail
429 * coming from this address, probably due to an
430 * anti-spam domain exclusion. Respect this. Don't
431 * try to ship the message, and don't prevent it from
432 * being deleted. There's no point in bouncing the
433 * email either since most spammers don't put their
434 * real return email address anywhere in the headers
435 * (unless the user insists with the SET SPAMBOUNCE
440 * 571 = sendmail's "unsolicited email refused"
441 * 550 = exim's new antispam response (temporary)
442 * 501 = exim's old antispam response
443 * 554 = Postfix antispam response.
447 send_bouncemail(ctl, msg, XMIT_ACCEPT,
448 "Our spam filter rejected this transaction.\r\n",
454 * Suppress error message only if the response specifically
455 * meant `excluded for policy reasons'. We *should* see
456 * an error when the return code is less specific.
459 report(stderr, _("%cMTP error: %s\n"),
465 case 552: /* message exceeds fixed maximum message size */
467 * Permanent no-go condition on the
468 * ESMTP server. Don't try to ship the message,
469 * and allow it to be deleted.
471 send_bouncemail(ctl, msg, XMIT_ACCEPT,
472 "This message was too large (SMTP error 552).\r\n",
474 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
476 case 553: /* invalid sending domain */
478 * These latter days 553 usually means a spammer is trying to
479 * cover his tracks. We never bouncemail on these, because
480 * (a) the return address is invalid by definition, and
481 * (b) we wouldn't want spammers to get confirmation that
482 * this address is live, anyway.
484 send_bouncemail(ctl, msg, XMIT_ACCEPT,
485 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
490 /* bounce non-transient errors back to the sender */
491 if (smtperr >= 500 && smtperr <= 599)
492 if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
493 "General SMTP/ESMTP error.\r\n",
495 return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
497 * We're going to end up here on 4xx errors, like:
499 * 451: temporarily unable to identify sender (exim)
500 * 452: temporary out-of-queue-space condition on the ESMTP server.
502 * These are temporary errors. Don't try to ship the message,
503 * and suppress deletion so it can be retried on a future
506 * Bouncemail *might* be appropriate here as a delay
507 * notification (note; if we ever add this, we must make
508 * sure the RFC1894 Action field is "delayed" rather thwn
509 * "failed"). But it's not really necessary because
510 * these are not actual failures, we're very likely to be
511 * able to recover on the next cycle.
513 return(PS_TRANSIENT);
517 int open_sink(struct query *ctl, struct msgblk *msg,
518 int *good_addresses, int *bad_addresses)
519 /* set up sinkfp to be an input sink we can ship a message to */
522 #ifdef HAVE_SIGACTION
523 struct sigaction sa_new;
524 #endif /* HAVE_SIGACTION */
526 *bad_addresses = *good_addresses = 0;
528 if (ctl->bsmtp) /* dump to a BSMTP batch file */
530 if (strcmp(ctl->bsmtp, "-") == 0)
533 sinkfp = fopen(ctl->bsmtp, "a");
535 /* see the ap computation under the SMTP branch */
537 "MAIL FROM: %s", (msg->return_path[0]) ? msg->return_path : user);
539 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
540 fputs(" BODY=8BITMIME", sinkfp);
541 else if (ctl->mimemsg & MSG_IS_7BIT)
542 fputs(" BODY=7BIT", sinkfp);
544 /* exim's BSMTP processor does not handle SIZE */
545 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
547 fprintf(sinkfp, "\r\n");
550 * RFC 1123 requires that the domain name part of the
551 * RCPT TO address be "canonicalized", that is a FQDN
552 * or MX but not a CNAME. Some listeners (like exim)
553 * enforce this. Now that we have the actual hostname,
554 * compute what we should canonicalize with.
556 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
559 for (idp = msg->recipients; idp; idp = idp->next)
560 if (idp->val.status.mark == XMIT_ACCEPT)
563 fprintf(sinkfp, "RCPT TO: %s\r\n", ctl->smtpname);
564 else if (strchr(idp->id, '@'))
566 "RCPT TO: %s\r\n", idp->id);
569 "RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
573 fputs("DATA\r\n", sinkfp);
577 report(stderr, _("BSMTP file open or preamble write failed\n"));
583 * Try to forward to an SMTP or LMTP listener. If the attempt to
584 * open a socket fails, fall through to attempt delivery via
587 else if (!ctl->mda && smtp_open(ctl) != -1)
590 char options[MSGBUFSIZE];
591 char addr[HOSTLEN+USERNAMELEN+1];
592 char **from_responses;
596 * Compute ESMTP options.
599 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
600 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
601 strcpy(options, " BODY=8BITMIME");
602 else if (ctl->mimemsg & MSG_IS_7BIT)
603 strcpy(options, " BODY=7BIT");
606 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
607 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
610 * Try to get the SMTP listener to take the Return-Path
611 * address as MAIL FROM. If it won't, fall back on the
612 * remotename and mailserver host. This won't affect replies,
613 * which use the header From address anyway; the MAIL FROM
614 * address is a place for the SMTP listener to send
615 * bouncemail. The point is to guarantee a FQDN in the MAIL
616 * FROM line -- some SMTP listeners, like smail, become
619 * RFC 1123 requires that the domain name part of the
620 * MAIL FROM address be "canonicalized", that is a
621 * FQDN or MX but not a CNAME. We'll assume the Return-Path
622 * header is already in this form here (it certainly
623 * is if rewrite is on). RFC 1123 is silent on whether
624 * a nonexistent hostname part is considered canonical.
626 * This is a potential problem if the MTAs further upstream
627 * didn't pass canonicalized From/Return-Path lines, *and* the
628 * local SMTP listener insists on them.
630 * Handle the case where an upstream MTA is setting a return
631 * path equal to "@". Ghod knows why anyone does this, but
632 * it's been reported to happen in mail from Amazon.com and
635 if (!msg->return_path[0] || (0 == strcmp(msg->return_path, "@")))
638 snprintf(addr, sizeof(addr),
641 #endif /* HAVE_SNPRINTF */
642 "%s@%s", ctl->remotename, ctl->server.truename);
645 else if (strchr(msg->return_path, '@'))
646 ap = msg->return_path;
647 else /* in case Return-Path existed but was local */
650 snprintf(addr, sizeof(addr),
653 #endif /* HAVE_SNPRINTF */
654 "%s@%s", msg->return_path, ctl->server.truename);
658 if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
660 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
661 return(handle_smtp_report(ctl, msg));
665 * Now list the recipient addressees
668 for (idp = msg->recipients; idp; idp = idp->next)
670 xalloca(from_responses, char **, sizeof(char *) * total_addresses);
671 for (idp = msg->recipients; idp; idp = idp->next)
672 if (idp->val.status.mark == XMIT_ACCEPT)
674 if (strchr(idp->id, '@'))
675 strcpy(addr, idp->id);
679 snprintf(addr, sizeof(addr)-1, "%s", ctl->smtpname);
681 sprintf(addr, "%s", ctl->smtpname);
682 #endif /* HAVE_SNPRINTF */
686 snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
688 sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
689 #endif /* HAVE_SNPRINTF */
692 if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
696 char errbuf[POPBUFSIZE];
700 * Do *not* interpret a PS_REFUSED here as a directive
701 * to break out of the address loop. We want to go through
702 * and process the rest of the RCPT TO addresses.
704 handle_smtp_report(ctl, msg);
707 snprintf(errbuf, sizeof(errbuf), "%s: %s",
708 idp->id, smtp_response);
710 strncpy(errbuf, idp->id, sizeof(errbuf));
711 strcat(errbuf, ": ");
712 strcat(errbuf, smtp_response);
713 #endif /* HAVE_SNPRINTF */
715 xalloca(from_responses[*bad_addresses],
718 strcpy(from_responses[*bad_addresses], errbuf);
721 idp->val.status.mark = XMIT_RCPTBAD;
722 if (outlevel >= O_VERBOSE)
724 _("%cMTP listener doesn't like recipient address `%s'\n"),
725 ctl->listener, addr);
729 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
730 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
731 *bad_addresses, from_responses);
733 * It's tempting to do local notification only if bouncemail was
734 * insufficient -- that is, to add && total_addresses > *bad_addresses
735 * to the test here. The problem with this theory is that it would
736 * make initial diagnosis of a broken multidrop configuration very
737 * hard -- most single-recipient messages would just invisibly bounce.
739 if (!(*good_addresses))
741 if (!run.postmaster[0])
743 if (outlevel >= O_VERBOSE)
744 report(stderr, _("no address matches; no postmaster set.\n"));
745 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
748 if (strchr(run.postmaster, '@'))
749 strncpy(addr, run.postmaster, sizeof(addr));
753 snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
755 sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
756 #endif /* HAVE_SNPRINTF */
759 if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
761 report(stderr, _("can't even send to %s!\n"), run.postmaster);
762 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
766 if (outlevel >= O_VERBOSE)
767 report(stderr, _("no address matches; forwarding to %s.\n"), run.postmaster);
771 * Tell the listener we're ready to send data.
772 * Some listeners (like zmailer) may return antispam errors here.
774 if (SMTP_data(ctl->smtp_socket) != SM_OK)
776 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
777 return(handle_smtp_report(ctl, msg));
782 * Awkward case. User didn't specify an MDA. Our attempt to get a
783 * listener socket failed. Try to cope anyway -- initial configuration
784 * may have found procmail.
788 report(stderr, _("%cMTP connect to %s failed\n"),
790 ctl->smtphost ? ctl->smtphost : "localhost");
793 /* No fallback MDA declared. Bail out. */
797 * If user had things set up to forward offsite, no way
798 * we want to deliver locally!
800 if (ctl->smtphost && strcmp(ctl->smtphost, "localhost"))
804 * User was delivering locally. We have a fallback MDA.
805 * Latch it in place, logging the error, and fall through.
807 ctl->mda = FALLBACK_MDA;
809 report(stderr, _("can't raise the listener; falling back to %s"),
814 if (ctl->mda) /* must deliver through an MDA */
816 int length = 0, fromlen = 0, nameslen = 0;
817 char *names = NULL, *before, *after, *from = NULL;
819 ctl->destaddr = "localhost";
821 for (idp = msg->recipients; idp; idp = idp->next)
822 if (idp->val.status.mark == XMIT_ACCEPT)
825 length = strlen(ctl->mda);
826 before = xstrdup(ctl->mda);
828 /* get user addresses for %T (or %s for backward compatibility) */
829 if (strstr(before, "%s") || strstr(before, "%T"))
832 * We go through this in order to be able to handle very
833 * long lists of users and (re)implement %s.
836 for (idp = msg->recipients; idp; idp = idp->next)
837 if ((idp->val.status.mark == XMIT_ACCEPT))
838 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
839 if ((*good_addresses == 0))
840 nameslen = strlen(run.postmaster);
842 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
843 if (*good_addresses == 0)
844 strcpy(names, run.postmaster);
848 for (idp = msg->recipients; idp; idp = idp->next)
849 if (idp->val.status.mark == XMIT_ACCEPT)
851 strcat(names, idp->id);
854 names[--nameslen] = '\0'; /* chop trailing space */
857 /* sanitize names in order to contain only harmless shell chars */
861 /* get From address for %F */
862 if (strstr(before, "%F"))
864 from = xstrdup(msg->return_path);
866 /* sanitize from in order to contain *only* harmless shell chars */
869 fromlen = strlen(from);
872 /* do we have to build an mda string? */
877 /* find length of resulting mda string */
879 while ((sp = strstr(sp, "%s"))) {
880 length += nameslen - 2; /* subtract %s */
884 while ((sp = strstr(sp, "%T"))) {
885 length += nameslen - 2; /* subtract %T */
889 while ((sp = strstr(sp, "%F"))) {
890 length += fromlen - 2; /* subtract %F */
894 after = xmalloc(length + 1);
896 /* copy mda source string to after, while expanding %[sTF] */
897 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
898 if (sp[0] != '%') continue;
900 /* need to expand? BTW, no here overflow, because in
901 ** the worst case (end of string) sp[1] == '\0' */
902 if (sp[1] == 's' || sp[1] == 'T') {
905 sp++; /* position sp over [sT] */
906 dp--; /* adjust dp */
907 } else if (sp[1] == 'F') {
910 sp++; /* position sp over F */
911 dp--; /* adjust dp */
930 if (outlevel >= O_DEBUG)
931 report(stdout, _("about to deliver with: %s\n"), before);
935 * Arrange to run with user's permissions if we're root.
936 * This will initialize the ownership of any files the
937 * MDA creates properly. (The seteuid call is available
938 * under all BSDs and Linux)
941 #endif /* HAVE_SETEUID */
943 sinkfp = popen(before, "w");
948 /* this will fail quietly if we didn't start as root */
950 #endif /* HAVE_SETEUID */
954 report(stderr, _("MDA open failed\n"));
959 * We need to disable the normal SIGCHLD handling here because
960 * sigchld_handler() would reap away the error status, returning
961 * error status instead of 0 for successful completion.
963 #ifndef HAVE_SIGACTION
964 sigchld = signal(SIGCHLD, SIG_DFL);
966 memset (&sa_new, 0, sizeof sa_new);
967 sigemptyset (&sa_new.sa_mask);
968 sa_new.sa_handler = SIG_DFL;
969 sigaction (SIGCHLD, &sa_new, &sa_old);
970 #endif /* HAVE_SIGACTION */
974 * We need to stash this away in order to know how many
975 * response lines to expect after the LMTP end-of-message.
977 lmtp_responses = *good_addresses;
982 void release_sink(struct query *ctl)
983 /* release the per-message output sink, whether it's a pipe or SMTP socket */
985 if (ctl->bsmtp && sinkfp)
992 sinkfp = (FILE *)NULL;
994 #ifndef HAVE_SIGACTION
995 signal(SIGCHLD, sigchld);
997 sigaction (SIGCHLD, &sa_old, NULL);
998 #endif /* HAVE_SIGACTION */
1003 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
1004 /* perform end-of-message actions on the current output sink */
1010 /* close the delivery pipe, we'll reopen before next message */
1013 rc = pclose(sinkfp);
1014 sinkfp = (FILE *)NULL;
1018 #ifndef HAVE_SIGACTION
1019 signal(SIGCHLD, sigchld);
1021 sigaction (SIGCHLD, &sa_old, NULL);
1022 #endif /* HAVE_SIGACTION */
1023 deal_with_sigchld();
1027 _("MDA returned nonzero status %d\n"), rc);
1031 else if (ctl->bsmtp && sinkfp)
1035 /* implicit disk-full check here... */
1036 fputs(".\r\n", sinkfp);
1037 error = ferror(sinkfp);
1038 if (strcmp(ctl->bsmtp, "-"))
1039 if (fclose(sinkfp) == EOF) error = 1;
1043 _("Message termination or close of BSMTP file failed\n"));
1049 /* write message terminator */
1050 if (SMTP_eom(ctl->smtp_socket) != SM_OK)
1052 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
1053 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
1057 report(stderr, _("SMTP listener refused delivery\n"));
1063 * If this is an SMTP connection, SMTP_eom() ate the response.
1064 * But could be this is an LMTP connection, in which case we have to
1065 * interpret either (a) a single 503 response meaning there
1066 * were no successful RCPT TOs, or (b) a variable number of
1067 * responses, one for each successful RCPT TO. We need to send
1068 * bouncemail on each failed response and then return TRUE anyway,
1069 * otherwise the message will get left in the queue and resent
1070 * to people who got it the first time.
1072 if (ctl->listener == LMTP_MODE)
1074 if (lmtp_responses == 0)
1076 SMTP_ok(ctl->smtp_socket);
1079 * According to RFC2033, 503 is the only legal response
1080 * if no RCPT TO commands succeeded. No error recovery
1081 * is really possible here, as we have no idea what
1082 * insane thing the listener might be doing if it doesn't
1085 if (atoi(smtp_response) == 503)
1086 report(stderr, _("LMTP delivery error on EOM\n"));
1089 _("Unexpected non-503 response to LMTP EOM: %s\n"),
1093 * It's not completely clear what to do here. We choose to
1094 * interpret delivery failure here as a transient error,
1095 * the same way SMTP delivery failure is handled. If we're
1096 * wrong, an undead message will get stuck in the queue.
1105 /* eat the RFC2033-required responses, saving errors */
1106 xalloca(responses, char **, sizeof(char *) * lmtp_responses);
1107 for (errors = i = 0; i < lmtp_responses; i++)
1109 if (SMTP_ok(ctl->smtp_socket) == SM_OK)
1110 responses[i] = (char *)NULL;
1113 xalloca(responses[errors],
1115 strlen(smtp_response)+1);
1116 strcpy(responses[errors], smtp_response);
1122 return(TRUE); /* all deliveries succeeded */
1125 * One or more deliveries failed.
1126 * If we can bounce a failures list back to the
1127 * sender, and the postmaster does not want to
1128 * deal with the bounces return TRUE, deleting the
1129 * message from the server so it won't be
1130 * re-forwarded on subsequent poll cycles.
1132 return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
1133 "LSMTP partial delivery failure.\r\n",
1134 errors, responses));
1142 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
1143 /* set up output sink for a mailed warning to calling user */
1148 * Dispatching warning email is a little complicated. The problem is
1149 * that we have to deal with three distinct cases:
1151 * 1. Single-drop running from user account. Warning mail should
1152 * go to the local name for which we're collecting (coincides
1153 * with calling user).
1155 * 2. Single-drop running from root or other privileged ID, with rc
1156 * file generated on the fly (Ken Estes's weird setup...) Mail
1157 * should go to the local name for which we're collecting (does not
1158 * coincide with calling user).
1160 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1161 * member null so this message will fall through to run.postmaster.
1163 * The zero in the reallen element means we won't pass a SIZE
1164 * option to ESMTP; the message length would be more trouble than
1165 * it's worth to compute.
1167 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
1169 strcat(reply.return_path, fetchmailhost);
1171 if (!MULTIDROP(ctl)) /* send to calling user */
1175 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1176 status = open_sink(ctl, &reply, &good, &bad);
1177 free_str_list(&reply.recipients);
1180 else /* send to postmaster */
1181 return(open_sink(ctl, &reply, &good, &bad));
1184 #if defined(HAVE_STDARG_H)
1185 void stuff_warning(struct query *ctl, const char *fmt, ... )
1187 void stuff_warning(struct query *ctl, fmt, va_alist)
1189 const char *fmt; /* printf-style format */
1192 /* format and ship a warning message line by mail */
1194 char buf[POPBUFSIZE];
1198 * stuffline() requires its input to be writeable (for CR stripping),
1199 * so we needed to copy the message to a writeable buffer anyway in
1200 * case it was a string constant. We make a virtue of that necessity
1201 * here by supporting stdargs/varargs.
1203 #if defined(HAVE_STDARG_H)
1208 #ifdef HAVE_VSNPRINTF
1209 vsnprintf(buf, sizeof(buf), fmt, ap);
1211 vsprintf(buf, fmt, ap);
1215 #ifdef HAVE_SNPRINTF
1216 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1218 strcat(buf, "\r\n");
1219 #endif /* HAVE_SNPRINTF */
1221 stuffline(ctl, buf);
1224 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1225 /* sign and send mailed warnings */
1227 stuff_warning(ctl, _("--\r\n\t\t\t\tThe Fetchmail Daemon\r\n"));
1228 close_sink(ctl, msg, TRUE);
1231 /* sink.c ends here */