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.
20 #endif /* HAVE_MEMORY_H */
21 #if defined(STDC_HEADERS)
24 #if defined(HAVE_UNISTD_H)
27 #if defined(HAVE_STDARG_H)
35 #include "fetchmail.h"
37 /* for W* macros after pclose() */
39 #include <sys/types.h>
40 #include <sys/resource.h>
47 /* BSD portability hack...I know, this is an ugly place to put it */
48 #if !defined(SIGCHLD) && defined(SIGCLD)
49 #define SIGCHLD SIGCLD
52 /* makes the open_sink()/close_sink() pair non-reentrant */
53 static int lmtp_responses;
55 void smtp_close(struct query *ctl, int sayquit)
56 /* close the socket to SMTP server */
58 if (ctl->smtp_socket != -1)
61 SMTP_quit(ctl->smtp_socket, ctl->smtphostmode);
62 SockClose(ctl->smtp_socket);
63 ctl->smtp_socket = -1;
68 int smtp_open(struct query *ctl)
69 /* try to open a socket to the appropriate SMTP server for this query */
71 /* maybe it's time to close the socket in order to force delivery */
72 if (last_smtp_ok > 0 && time((time_t *)NULL) - last_smtp_ok > mytimeout)
77 if (NUM_NONZERO(ctl->batchlimit)) {
78 if (batchcount == ctl->batchlimit)
83 /* if no socket to any SMTP host is already set up, try to open one */
84 if (ctl->smtp_socket == -1)
87 * RFC 1123 requires that the domain name in HELO address is a
88 * "valid principal domain name" for the client host. If we're
89 * running in invisible mode, violate this with malice
90 * aforethought in order to make the Received headers and
93 * In fact this code relies on the RFC1123 requirement that the
94 * SMTP listener must accept messages even if verification of the
95 * HELO name fails (RFC1123 section 5.2.5, paragraph 2).
97 * How we compute the true mailhost name to pass to the
98 * listener doesn't affect behavior on RFC1123-violating
99 * listeners that check for name match; we're going to lose
100 * on those anyway because we can never give them a name
101 * that matches the local machine fetchmail is running on.
102 * What it will affect is the listener's logging.
105 const char *id_me = run.invisible ? ctl->server.truename : fetchmailhost;
106 int oldphase = phase;
107 char *parsed_host = NULL;
112 * Run down the SMTP hunt list looking for a server that's up.
113 * Use both explicit hunt entries (value TRUE) and implicit
114 * (default) ones (value FALSE).
117 phase = LISTENER_WAIT;
119 set_timeout(ctl->server.timeout);
120 for (idp = ctl->smtphunt; idp; idp = idp->next)
123 char *portnum = SMTP_PORT;
125 ctl->smtphost = idp->id; /* remember last host tried. */
126 if (ctl->smtphost[0]=='/')
128 ctl->smtphostmode = LMTP_MODE;
130 if ((ctl->smtp_socket = UnixOpen(ctl->smtphost))==-1)
135 ctl->smtphostmode = ctl->listener;
136 parsed_host = xstrdup(idp->id);
137 if ((cp = strrchr(parsed_host, '/')))
143 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,
144 ctl->server.plugout, &ai1)) == -1)
151 /* return immediately for ODMR */
152 if (ctl->server.protocol == P_ODMR)
157 return(ctl->smtp_socket); /* success */
160 /* first, probe for ESMTP */
161 if (SMTP_ok(ctl->smtp_socket, ctl->smtphostmode) == SM_OK &&
162 SMTP_ehlo(ctl->smtp_socket, ctl->smtphostmode, id_me,
163 ctl->server.esmtp_name, ctl->server.esmtp_password,
164 &ctl->server.esmtp_options) == SM_OK)
168 * RFC 1869 warns that some listeners hang up on a failed EHLO,
169 * so it's safest not to assume the socket will still be good.
173 /* if opening for ESMTP failed, try SMTP */
174 if (ctl->smtphost[0]=='/')
176 if ((ctl->smtp_socket = UnixOpen(ctl->smtphost))==-1)
181 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,
182 ctl->server.plugout, &ai1)) == -1)
189 if (SMTP_ok(ctl->smtp_socket, ctl->smtphostmode) == SM_OK &&
190 SMTP_helo(ctl->smtp_socket, ctl->smtphostmode, id_me) == SM_OK)
199 * RFC 1123 requires that the domain name part of the
200 * RCPT TO address be "canonicalized", that is a FQDN
201 * or MX but not a CNAME. Some listeners (like exim)
202 * enforce this. Now that we have the actual hostname,
203 * compute what we should canonicalize with.
205 xfree(ctl->destaddr);
206 if (ctl->smtpaddress)
207 ctl->destaddr = xstrdup(ctl->smtpaddress);
208 /* parsed_host is smtphost without the /port */
209 else if (parsed_host && parsed_host[0] != 0)
210 ctl->destaddr = xstrdup(parsed_host);
211 /* No smtphost is specified or it is a UNIX socket, then use
212 localhost as a domain part. */
214 ctl->destaddr = xstrdup("localhost");
217 /* end if (ctl->smtp_socket == -1) */
219 if (outlevel >= O_DEBUG && ctl->smtp_socket != -1)
220 report(stdout, GT_("forwarding to %s\n"), ctl->smtphost);
222 return(ctl->smtp_socket);
225 static void sanitize(char *s)
230 for (cp = s; (cp = strchr (cp, '\'')); cp++)
234 char *rcpt_address(struct query *ctl, const char *id,
237 static char addr[HOSTLEN+USERNAMELEN+1];
240 snprintf(addr, sizeof (addr), "%s", id);
242 else if (usesmtpname && ctl->smtpname)
244 snprintf(addr, sizeof (addr), "%s", ctl->smtpname);
248 snprintf(addr, sizeof (addr), "%s@%s", id, ctl->destaddr);
253 static int send_bouncemail(struct query *ctl, struct msgblk *msg,
254 int userclass, char *message,
255 int nerrors, char *errors[])
256 /* bounce back an error report a la RFC 1892 */
258 char daemon_name[15 + HOSTLEN] = "MAILER-DAEMON@";
259 char boundary[BUFSIZ], *bounce_to;
261 static char *fqdn_of_host = NULL;
262 const char *md1 = "MAILER-DAEMON", *md2 = "MAILER-DAEMON@";
264 /* don't bounce in reply to undeliverable bounces */
265 if (!msg->return_path[0] ||
266 strcmp(msg->return_path, "<>") == 0 ||
267 strcasecmp(msg->return_path, md1) == 0 ||
268 strncasecmp(msg->return_path, md2, strlen(md2)) == 0)
271 bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
273 /* can't just use fetchmailhost here, it might be localhost */
274 if (fqdn_of_host == NULL)
275 fqdn_of_host = host_fqdn(0); /* can't afford to bail out and
277 strlcat(daemon_name, fqdn_of_host, sizeof(daemon_name));
279 /* we need only SMTP for this purpose */
280 /* XXX FIXME: hardcoding localhost is nonsense if smtphost can be
282 if ((sock = SockOpen("localhost", SMTP_PORT, NULL, &ai1)) == -1)
285 if (SMTP_ok(sock, SMTP_MODE) != SM_OK)
291 if (SMTP_helo(sock, SMTP_MODE, fetchmailhost) != SM_OK
292 || SMTP_from(sock, SMTP_MODE, "<>", (char *)NULL) != SM_OK
293 || SMTP_rcpt(sock, SMTP_MODE, bounce_to) != SM_OK
294 || SMTP_data(sock, SMTP_MODE) != SM_OK)
296 SMTP_quit(sock, SMTP_MODE);
301 /* our first duty is to keep the sacred foo counters turning... */
302 snprintf(boundary, sizeof(boundary), "foo-mani-padme-hum-%ld-%ld-%ld",
303 (long)getpid(), (long)getppid(), (long)time(NULL));
305 if (outlevel >= O_VERBOSE)
306 report(stdout, GT_("SMTP: (bounce-message body)\n"));
308 /* this will usually go to sylog... */
309 report(stderr, GT_("mail from %s bounced to %s\n"),
310 daemon_name, bounce_to);
313 /* bouncemail headers */
314 SockPrintf(sock, "Subject: Mail delivery failed: returning message to sender\r\n");
315 SockPrintf(sock, "From: Mail Delivery System <%s>\r\n", daemon_name);
316 SockPrintf(sock, "To: %s\r\n", bounce_to);
317 SockPrintf(sock, "MIME-Version: 1.0\r\n");
318 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
319 SockPrintf(sock, "\r\n");
321 /* RFC1892 part 1 -- human-readable message */
322 SockPrintf(sock, "--%s\r\n", boundary);
323 SockPrintf(sock,"Content-Type: text/plain\r\n");
324 SockPrintf(sock, "\r\n");
325 SockPrintf(sock, "This message was created automatically by mail delivery software.\r\n\r\n");
326 SockPrintf(sock, "A message that you sent could not be delivered to one or more of its\r\n");
327 SockPrintf(sock, "recipients. This is a permanent error. The following address(es) failed:\r\n");
328 SockPrintf(sock, "\r\n");
336 for (idp = msg->recipients; idp; idp = idp->next)
338 if (idp->val.status.mark == userclass)
341 SockPrintf(sock, "%s\r\n", rcpt_address (ctl, idp->id, 1));
343 if (nerrors == 1) error = errors[0];
344 else if (nerrors <= nusers)
346 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
349 else error = errors[nusers++];
351 SockPrintf(sock, " SMTP error: %s\r\n\r\n", error);
355 /* RFC1892 part 2 -- machine-readable responses */
356 SockPrintf(sock, "--%s\r\n", boundary);
357 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
358 SockPrintf(sock, "\r\n");
359 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fqdn_of_host);
362 for (idp = msg->recipients; idp; idp = idp->next)
363 if (idp->val.status.mark == userclass)
366 /* Minimum RFC1894 compliance + Diagnostic-Code field */
367 SockPrintf(sock, "\r\n");
368 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n",
369 rcpt_address (ctl, idp->id, 1));
370 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", rfc822timestamp());
371 SockPrintf(sock, "Action: failed\r\n");
374 /* one error applies to all users */
376 else if (nerrors <= nusers)
378 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
382 /* errors correspond 1-1 to selected users */
383 error = errors[nusers++];
385 if (strlen(error) > 9 && isdigit((unsigned char)error[4])
386 && error[5] == '.' && isdigit((unsigned char)error[6])
387 && error[7] == '.' && isdigit((unsigned char)error[8]))
388 /* Enhanced status code available, use it */
389 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
391 /* Enhanced status code not available, fake one */
392 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
393 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
395 SockPrintf(sock, "\r\n");
398 /* RFC1892 part 3 -- headers of undelivered message */
399 SockPrintf(sock, "--%s\r\n", boundary);
400 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
401 SockPrintf(sock, "\r\n");
404 SockWrite(sock, msg->headers, strlen(msg->headers));
405 SockPrintf(sock, "\r\n");
407 SockPrintf(sock, "--%s--\r\n", boundary);
409 if (SMTP_eom(sock, SMTP_MODE) != SM_OK
410 || SMTP_quit(sock, SMTP_MODE) != SM_OK)
421 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
422 /* handle SMTP errors based on the content of SMTP_response */
423 /* returns either PS_REFUSED (to delete message from the server),
424 * or PS_TRANSIENT (keeps the message on the server) */
426 int smtperr = atoi(smtp_response);
431 responses[0] = xstrdup(smtp_response);
435 * Don't do this! It can really mess you up if, for example, you're
436 * reporting an error with a single RCPT TO address among several;
437 * RSET discards the message body and it doesn't get sent to the
440 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
441 if (outlevel >= O_DEBUG)
442 report(stdout, GT_("Saved error is still %d\n"), smtperr);
443 #endif /* __UNUSED */
446 * Note: send_bouncemail message strings are not made subject
447 * to gettext translation because (a) they're going to be
448 * embedded in a text/plain 7bit part, and (b) they're
449 * going to be associated with listener error-response
450 * messages, which are probably in English (none of the
451 * MTAs I know about are internationalized).
453 for( walk = ctl->antispam; walk; walk = walk->next )
454 if ( walk->val.status.num == smtperr )
460 /* if (str_find(&ctl->antispam, smtperr)) */
464 * SMTP listener explicitly refuses to deliver mail
465 * coming from this address, probably due to an
466 * anti-spam domain exclusion. Respect this. Don't
467 * try to ship the message, and don't prevent it from
468 * being deleted. There's no point in bouncing the
469 * email either since most spammers don't put their
470 * real return email address anywhere in the headers
471 * (unless the user insists with the SET SPAMBOUNCE
476 * 571 = sendmail's "unsolicited email refused"
477 * 550 = exim's new antispam response (temporary)
478 * 501 = exim's old antispam response
479 * 554 = Postfix antispam response.
485 snprintf(rejmsg, sizeof(rejmsg),
486 "spam filter or virus scanner rejected message because:\r\n"
487 "%s\r\n", responses[0]);
489 send_bouncemail(ctl, msg, XMIT_ACCEPT,
490 rejmsg, 1, responses);
497 * Suppress error message only if the response specifically
498 * meant `excluded for policy reasons'. We *should* see
499 * an error when the return code is less specific.
502 report(stderr, GT_("%cMTP error: %s\n"),
508 case 552: /* message exceeds fixed maximum message size */
510 * Permanent no-go condition on the
511 * ESMTP server. Don't try to ship the message,
512 * and allow it to be deleted.
515 send_bouncemail(ctl, msg, XMIT_ACCEPT,
516 "This message was too large (SMTP error 552).\r\n",
521 case 553: /* invalid sending domain */
523 * These latter days 553 usually means a spammer is trying to
524 * cover his tracks. We never bouncemail on these, because
525 * (a) the return address is invalid by definition, and
526 * (b) we wouldn't want spammers to get confirmation that
527 * this address is live, anyway.
529 #ifdef __DONT_FEED_THE_SPAMMERS__
531 send_bouncemail(ctl, msg, XMIT_ACCEPT,
532 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
534 #endif /* __DONT_FEED_THE_SPAMMERS__ */
539 /* bounce non-transient errors back to the sender */
540 if (smtperr >= 500 && smtperr <= 599)
543 send_bouncemail(ctl, msg, XMIT_ACCEPT,
544 "General SMTP/ESMTP error.\r\n",
550 * We're going to end up here on 4xx errors, like:
552 * 451: temporarily unable to identify sender (exim)
553 * 452: temporary out-of-queue-space condition on the ESMTP server.
555 * These are temporary errors. Don't try to ship the message,
556 * and suppress deletion so it can be retried on a future
559 * Bouncemail *might* be appropriate here as a delay
560 * notification (note; if we ever add this, we must make
561 * sure the RFC1894 Action field is "delayed" rather than
562 * "failed"). But it's not really necessary because
563 * these are not actual failures, we're very likely to be
564 * able to recover on the next cycle.
567 return(PS_TRANSIENT);
571 static int handle_smtp_report_without_bounce(struct query *ctl, struct msgblk *msg)
572 /* handle SMTP errors based on the content of SMTP_response */
573 /* atleast one PS_TRANSIENT: do not send the bounce mail, keep the mail;
574 * no PS_TRANSIENT, atleast one PS_SUCCESS: send the bounce mail, delete the mail;
575 * no PS_TRANSIENT, no PS_SUCCESS: do not send the bounce mail, delete the mail */
577 int smtperr = atoi(smtp_response);
579 if (str_find(&ctl->antispam, smtperr))
587 report(stderr, GT_("%cMTP error: %s\n"),
593 case 552: /* message exceeds fixed maximum message size */
598 case 553: /* invalid sending domain */
599 #ifdef __DONT_FEED_THE_SPAMMERS__
602 #endif /* __DONT_FEED_THE_SPAMMERS__ */
606 /* bounce non-transient errors back to the sender */
607 if (smtperr >= 500 && smtperr <= 599)
609 return(PS_TRANSIENT);
613 /* these are shared by open_sink and stuffline */
616 int stuffline(struct query *ctl, char *buf)
617 /* ship a line to the given control block's output sink (SMTP server or MDA) */
622 /* The line may contain NUL characters. Find the last char to use
623 * -- the real line termination is the sequence "\n\0".
625 last = buf + 1; /* last[-1] must be valid! */
626 while ((last += strlen(last)) && (last[-1] != '\n'))
629 /* fix message lines that have only \n termination (for qmail) */
632 if (last - 1 == buf || last[-2] != '\r')
641 phase = FORWARDING_WAIT;
644 * SMTP byte-stuffing. We only do this if the protocol does *not*
645 * use .<CR><LF> as EOM. If it does, the server will already have
646 * decorated any . lines it sends back up.
650 if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
653 /* writing to MDA, undo byte-stuffing */
656 /* writing to SMTP, leave the byte-stuffing in place */;
659 else /* if (!protocol->delimited) -- not byte-stuffed already */
664 n = SockWrite(ctl->smtp_socket, buf, 1);
666 n = fwrite(buf, 1, 1, sinkfp);
667 if (ferror(sinkfp)) n = -1;
675 /* we may need to strip carriage returns */
680 for (sp = tp = buf; sp < last; sp++)
688 if (ctl->mda || ctl->bsmtp) {
689 n = fwrite(buf, last - buf, 1, sinkfp);
690 if (ferror(sinkfp)) n = -1;
691 } else if (ctl->smtp_socket != -1)
692 n = SockWrite(ctl->smtp_socket, buf, last - buf);
699 static int open_bsmtp_sink(struct query *ctl, struct msgblk *msg,
700 int *good_addresses, int *bad_addresses)
701 /* open a BSMTP stream */
706 if (strcmp(ctl->bsmtp, "-") == 0)
709 sinkfp = fopen(ctl->bsmtp, "a");
711 /* see the ap computation under the SMTP branch */
712 need_anglebrs = (msg->return_path[0] != '<');
715 need_anglebrs ? "<" : "",
716 (msg->return_path[0]) ? msg->return_path : user,
717 need_anglebrs ? ">" : "");
719 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
720 fputs(" BODY=8BITMIME", sinkfp);
721 else if (ctl->mimemsg & MSG_IS_7BIT)
722 fputs(" BODY=7BIT", sinkfp);
724 /* exim's BSMTP processor does not handle SIZE */
725 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
727 fprintf(sinkfp, "\r\n");
730 * RFC 1123 requires that the domain name part of the
731 * RCPT TO address be "canonicalized", that is a FQDN
732 * or MX but not a CNAME. Some listeners (like exim)
733 * enforce this. Now that we have the actual hostname,
734 * compute what we should canonicalize with.
736 xfree(ctl->destaddr);
737 ctl->destaddr = xstrdup(ctl->smtpaddress ? ctl->smtpaddress : "localhost");
740 for (idp = msg->recipients; idp; idp = idp->next)
741 if (idp->val.status.mark == XMIT_ACCEPT)
743 fprintf(sinkfp, "RCPT TO:<%s>\r\n",
744 rcpt_address (ctl, idp->id, 1));
748 fputs("DATA\r\n", sinkfp);
752 report(stderr, GT_("BSMTP file open or preamble write failed\n"));
759 /* this is experimental and will be removed if double bounces are reported */
760 #define EXPLICIT_BOUNCE_ON_BAD_ADDRESS
763 static const char *is_quad(const char *q)
764 /* Check if the string passed in points to what could be one quad of a
765 * dotted-quad IP address. Requirements are that the string is not a
766 * NULL pointer, begins with a period (which is skipped) or a digit
767 * and ends with a period or a NULL. If these requirements are met, a
768 * pointer to the last character (the period or the NULL character) is
769 * returned; otherwise NULL.
778 for(r=q;isdigit((unsigned char)*r);r++)
780 if ( ((*r) && (*r != '.')) || ((r-q) < 1) || ((r-q)>3) )
782 /* Make sure quad is < 255 */
791 else if (*(q+1) == '5')
801 static int is_dottedquad(const char *hostname)
802 /* Returns a true value if the passed in string looks like an IP
803 * address in dotted-quad form, and a false value otherwise.
807 return ((hostname=is_quad(is_quad(is_quad(is_quad(hostname))))) != NULL) &&
811 static int open_smtp_sink(struct query *ctl, struct msgblk *msg,
812 int *good_addresses, int *bad_addresses /* this must be signed, to prevent endless loop in from_addresses */)
813 /* open an SMTP stream */
817 char options[MSGBUFSIZE];
818 char addr[HOSTLEN+USERNAMELEN+1];
819 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
820 char **from_responses;
821 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
823 int force_transient_error = 0;
827 * Compute ESMTP options.
830 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
831 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
832 strcpy(options, " BODY=8BITMIME");
833 else if (ctl->mimemsg & MSG_IS_7BIT)
834 strcpy(options, " BODY=7BIT");
837 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
838 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
841 * Try to get the SMTP listener to take the Return-Path
842 * address as MAIL FROM. If it won't, fall back on the
843 * remotename and mailserver host. This won't affect replies,
844 * which use the header From address anyway; the MAIL FROM
845 * address is a place for the SMTP listener to send
846 * bouncemail. The point is to guarantee a FQDN in the MAIL
847 * FROM line -- some SMTP listeners, like smail, become
850 * RFC 1123 requires that the domain name part of the
851 * MAIL FROM address be "canonicalized", that is a
852 * FQDN or MX but not a CNAME. We'll assume the Return-Path
853 * header is already in this form here (it certainly
854 * is if rewrite is on). RFC 1123 is silent on whether
855 * a nonexistent hostname part is considered canonical.
857 * This is a potential problem if the MTAs further upstream
858 * didn't pass canonicalized From/Return-Path lines, *and* the
859 * local SMTP listener insists on them.
861 * Handle the case where an upstream MTA is setting a return
862 * path equal to "@". Ghod knows why anyone does this, but
863 * it's been reported to happen in mail from Amazon.com and
866 * Also, if the hostname is a dotted quad, wrap it in square brackets.
867 * Apparently this is required by RFC2821, section 4.1.3.
869 if (!msg->return_path[0] || (msg->return_path[0] == '@'))
871 if (strchr(ctl->remotename,'@') || strchr(ctl->remotename,'!'))
873 snprintf(addr, sizeof(addr), "%s", ctl->remotename);
875 else if (is_dottedquad(ctl->server.truename))
877 snprintf(addr, sizeof(addr), "%s@[%s]", ctl->remotename,
878 ctl->server.truename);
882 snprintf(addr, sizeof(addr),
883 "%s@%s", ctl->remotename, ctl->server.truename);
887 else if (strchr(msg->return_path,'@') || strchr(msg->return_path,'!'))
888 ap = msg->return_path;
889 /* in case Return-Path was "<>" we want to preserve that */
890 else if (strcmp(msg->return_path,"<>") == 0)
891 ap = msg->return_path;
892 else /* in case Return-Path existed but was local */
894 if (is_dottedquad(ctl->server.truename))
896 snprintf(addr, sizeof(addr), "%s@[%s]", msg->return_path,
897 ctl->server.truename);
901 snprintf(addr, sizeof(addr), "%s@%s",
902 msg->return_path, ctl->server.truename);
907 if ((smtp_err = SMTP_from(ctl->smtp_socket, ctl->smtphostmode,
908 ap, options)) == SM_UNRECOVERABLE)
911 return(PS_TRANSIENT);
913 if (smtp_err != SM_OK)
915 int err = handle_smtp_report(ctl, msg); /* map to PS_TRANSIENT or PS_REFUSED */
917 SMTP_rset(ctl->smtp_socket, ctl->smtphostmode); /* stay on the safe side */
922 * Now list the recipient addressees
925 for (idp = msg->recipients; idp; idp = idp->next)
927 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
928 from_responses = (char **)xmalloc(sizeof(char *) * total_addresses);
929 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
930 for (idp = msg->recipients; idp; idp = idp->next)
931 if (idp->val.status.mark == XMIT_ACCEPT)
934 address = rcpt_address (ctl, idp->id, 1);
935 if ((smtp_err = SMTP_rcpt(ctl->smtp_socket, ctl->smtphostmode,
936 address)) == SM_UNRECOVERABLE)
940 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
941 while (*bad_addresses)
942 free(from_responses[--*bad_addresses]);
943 free(from_responses);
944 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
945 return(PS_TRANSIENT);
947 if (smtp_err == SM_OK)
951 switch (handle_smtp_report_without_bounce(ctl, msg))
954 force_transient_error = 1;
958 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
959 from_responses[*bad_addresses] = xstrdup(smtp_response);
960 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
963 idp->val.status.mark = XMIT_RCPTBAD;
964 if (outlevel >= O_VERBOSE)
966 GT_("%cMTP listener doesn't like recipient address `%s'\n"),
967 ctl->smtphostmode, address);
971 if (outlevel >= O_VERBOSE)
973 GT_("%cMTP listener doesn't really like recipient address `%s'\n"),
974 ctl->smtphostmode, address);
980 if (force_transient_error) {
981 /* do not risk dataloss due to overengineered multidrop
982 * crap. If one of the recipients returned PS_TRANSIENT,
983 * we return exactly that.
985 SMTP_rset(ctl->smtp_socket, ctl->smtphostmode); /* required by RFC1870 */
988 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
990 * This should not be necessary, because the SMTP listener itself
991 * should generate a bounce for the bad address.
993 * XXX FIXME 2006-01-19: is this comment true? I don't think
994 * it is, because the SMTP listener isn't required to accept bogus
995 * messages. There appears to be general SMTP<->MDA and
996 * responsibility confusion.
999 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
1000 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
1001 *bad_addresses, from_responses);
1002 while (*bad_addresses)
1003 free(from_responses[--*bad_addresses]);
1004 free(from_responses);
1005 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
1008 * It's tempting to do local notification only if bouncemail was
1009 * insufficient -- that is, to add && total_addresses > *bad_addresses
1010 * to the test here. The problem with this theory is that it would
1011 * make initial diagnosis of a broken multidrop configuration very
1012 * hard -- most single-recipient messages would just invisibly bounce.
1014 if (!(*good_addresses))
1016 if (!run.postmaster[0])
1018 if (outlevel >= O_VERBOSE)
1019 report(stderr, GT_("no address matches; no postmaster set.\n"));
1020 SMTP_rset(ctl->smtp_socket, ctl->smtphostmode); /* required by RFC1870 */
1023 if ((smtp_err = SMTP_rcpt(ctl->smtp_socket, ctl->smtphostmode,
1024 rcpt_address (ctl, run.postmaster, 0))) == SM_UNRECOVERABLE)
1027 return(PS_TRANSIENT);
1029 if (smtp_err != SM_OK)
1031 report(stderr, GT_("can't even send to %s!\n"), run.postmaster);
1032 SMTP_rset(ctl->smtp_socket, ctl->smtphostmode); /* required by RFC1870 */
1036 if (outlevel >= O_VERBOSE)
1037 report(stderr, GT_("no address matches; forwarding to %s.\n"), run.postmaster);
1041 * Tell the listener we're ready to send data.
1042 * Some listeners (like zmailer) may return antispam errors here.
1044 if ((smtp_err = SMTP_data(ctl->smtp_socket, ctl->smtphostmode))
1045 == SM_UNRECOVERABLE)
1048 return(PS_TRANSIENT);
1050 if (smtp_err != SM_OK)
1052 int err = handle_smtp_report(ctl, msg);
1053 SMTP_rset(ctl->smtp_socket, ctl->smtphostmode); /* stay on the safe side */
1058 * We need to stash this away in order to know how many
1059 * response lines to expect after the LMTP end-of-message.
1061 lmtp_responses = *good_addresses;
1066 static int open_mda_sink(struct query *ctl, struct msgblk *msg,
1067 int *good_addresses, int *bad_addresses)
1068 /* open a stream to a local MDA */
1072 #endif /* HAVE_SETEUID */
1074 int length = 0, fromlen = 0, nameslen = 0;
1075 char *names = NULL, *before, *after, *from = NULL;
1077 (void)bad_addresses;
1078 xfree(ctl->destaddr);
1079 ctl->destaddr = xstrdup("localhost");
1081 for (idp = msg->recipients; idp; idp = idp->next)
1082 if (idp->val.status.mark == XMIT_ACCEPT)
1083 (*good_addresses)++;
1085 length = strlen(ctl->mda);
1086 before = xstrdup(ctl->mda);
1088 /* get user addresses for %T (or %s for backward compatibility) */
1089 if (strstr(before, "%s") || strstr(before, "%T"))
1092 * We go through this in order to be able to handle very
1093 * long lists of users and (re)implement %s.
1096 for (idp = msg->recipients; idp; idp = idp->next)
1097 if ((idp->val.status.mark == XMIT_ACCEPT))
1098 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
1099 if ((*good_addresses == 0))
1100 nameslen = strlen(run.postmaster);
1102 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
1103 if (*good_addresses == 0)
1104 strcpy(names, run.postmaster);
1108 for (idp = msg->recipients; idp; idp = idp->next)
1109 if (idp->val.status.mark == XMIT_ACCEPT)
1111 strcat(names, idp->id);
1114 names[--nameslen] = '\0'; /* chop trailing space */
1120 /* get From address for %F */
1121 if (strstr(before, "%F"))
1123 from = xstrdup(msg->return_path);
1127 fromlen = strlen(from);
1130 /* do we have to build an mda string? */
1135 /* find length of resulting mda string */
1137 while ((sp = strstr(sp, "%s"))) {
1138 length += nameslen; /* subtract %s and add '' */
1142 while ((sp = strstr(sp, "%T"))) {
1143 length += nameslen; /* subtract %T and add '' */
1147 while ((sp = strstr(sp, "%F"))) {
1148 length += fromlen; /* subtract %F and add '' */
1152 after = xmalloc(length + 1);
1154 /* copy mda source string to after, while expanding %[sTF] */
1155 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
1156 if (sp[0] != '%') continue;
1158 /* need to expand? BTW, no here overflow, because in
1159 ** the worst case (end of string) sp[1] == '\0' */
1160 if (sp[1] == 's' || sp[1] == 'T') {
1165 sp++; /* position sp over [sT] */
1166 dp--; /* adjust dp */
1167 } else if (sp[1] == 'F') {
1172 sp++; /* position sp over F */
1173 dp--; /* adjust dp */
1192 if (outlevel >= O_DEBUG)
1193 report(stdout, GT_("about to deliver with: %s\n"), before);
1197 * Arrange to run with user's permissions if we're root.
1198 * This will initialize the ownership of any files the
1199 * MDA creates properly. (The seteuid call is available
1200 * under all BSDs and Linux)
1202 orig_uid = getuid();
1204 #endif /* HAVE_SETEUID */
1206 sinkfp = popen(before, "w");
1211 /* this will fail quietly if we didn't start as root */
1213 #endif /* HAVE_SETEUID */
1217 report(stderr, GT_("MDA open failed\n"));
1222 * We need to disable the normal SIGCHLD handling here because
1223 * sigchld_handler() would reap away the error status, returning
1224 * error status instead of 0 for successful completion.
1226 set_signal_handler(SIGCHLD, SIG_DFL);
1231 int open_sink(struct query *ctl, struct msgblk *msg,
1232 int *good_addresses, int *bad_addresses)
1233 /* set up sinkfp to be an input sink we can ship a message to */
1235 *bad_addresses = *good_addresses = 0;
1237 if (ctl->bsmtp) /* dump to a BSMTP batch file */
1238 return(open_bsmtp_sink(ctl, msg, good_addresses, bad_addresses));
1240 * Try to forward to an SMTP or LMTP listener. If the attempt to
1241 * open a socket fails, fall through to attempt delivery via
1244 else if (!ctl->mda && smtp_open(ctl) != -1)
1245 return(open_smtp_sink(ctl, msg, good_addresses, bad_addresses));
1248 * Awkward case. User didn't specify an MDA. Our attempt to get a
1249 * listener socket failed. Try to cope anyway -- initial configuration
1250 * may have found procmail.
1254 report(stderr, GT_("%cMTP connect to %s failed\n"),
1256 ctl->smtphost ? ctl->smtphost : "localhost");
1258 #ifndef FALLBACK_MDA
1259 /* No fallback MDA declared. Bail out. */
1263 * If user had things set up to forward offsite, no way
1264 * we want to deliver locally!
1266 if (ctl->smtphost && strcmp(ctl->smtphost, "localhost"))
1270 * User was delivering locally. We have a fallback MDA.
1271 * Latch it in place, logging the error, and fall through.
1272 * Set stripcr as we would if MDA had been the initial transport
1274 ctl->mda = FALLBACK_MDA;
1276 ctl->stripcr = TRUE;
1278 report(stderr, GT_("can't raise the listener; falling back to %s"),
1283 if (ctl->mda) /* must deliver through an MDA */
1284 return(open_mda_sink(ctl, msg, good_addresses, bad_addresses));
1289 void release_sink(struct query *ctl)
1290 /* release the per-message output sink, whether it's a pipe or SMTP socket */
1292 if (ctl->bsmtp && sinkfp)
1294 if (strcmp(ctl->bsmtp, "-"))
1297 sinkfp = (FILE *)NULL;
1305 sinkfp = (FILE *)NULL;
1307 deal_with_sigchld(); /* Restore SIGCHLD handling to reap zombies */
1311 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
1312 /* perform end-of-message actions on the current output sink */
1317 int rc,e,e2,err = 0;
1319 /* close the delivery pipe, we'll reopen before next message */
1323 err = 1, e2 = errno;
1324 if ((fflush(sinkfp)))
1325 err = 1, e2 = errno;
1328 rc = pclose(sinkfp);
1330 sinkfp = (FILE *)NULL;
1335 deal_with_sigchld(); /* Restore SIGCHLD handling to reap zombies */
1340 report(stderr, GT_("Error writing to MDA: %s\n"), strerror(e2));
1341 } else if (WIFSIGNALED(rc)) {
1343 GT_("MDA died of signal %d\n"), WTERMSIG(rc));
1344 } else if (WIFEXITED(rc)) {
1346 GT_("MDA returned nonzero status %d\n"), WEXITSTATUS(rc));
1349 GT_("Strange: MDA pclose returned %d and errno %d/%s, cannot handle at %s:%d\n"),
1350 rc, e, strerror(e), __FILE__, __LINE__);
1356 else if (ctl->bsmtp && sinkfp)
1360 /* implicit disk-full check here... */
1361 fputs(".\r\n", sinkfp);
1362 error = ferror(sinkfp);
1363 if (strcmp(ctl->bsmtp, "-"))
1365 if (fclose(sinkfp) == EOF) error = 1;
1366 sinkfp = (FILE *)NULL;
1371 GT_("Message termination or close of BSMTP file failed\n"));
1377 /* write message terminator */
1378 if ((smtp_err = SMTP_eom(ctl->smtp_socket, ctl->smtphostmode))
1379 == SM_UNRECOVERABLE)
1384 if (smtp_err != SM_OK)
1386 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
1388 SMTP_rset(ctl->smtp_socket, ctl->smtphostmode); /* stay on the safe side */
1393 report(stderr, GT_("SMTP listener refused delivery\n"));
1394 SMTP_rset(ctl->smtp_socket, ctl->smtphostmode); /* stay on the safe side */
1400 * If this is an SMTP connection, SMTP_eom() ate the response.
1401 * But could be this is an LMTP connection, in which case we have to
1402 * interpret either (a) a single 503 response meaning there
1403 * were no successful RCPT TOs, or (b) a variable number of
1404 * responses, one for each successful RCPT TO. We need to send
1405 * bouncemail on each failed response and then return TRUE anyway,
1406 * otherwise the message will get left in the queue and resent
1407 * to people who got it the first time.
1409 if (ctl->smtphostmode == LMTP_MODE)
1411 if (lmtp_responses == 0)
1413 SMTP_ok(ctl->smtp_socket, ctl->smtphostmode);
1416 * According to RFC2033, 503 is the only legal response
1417 * if no RCPT TO commands succeeded. No error recovery
1418 * is really possible here, as we have no idea what
1419 * insane thing the listener might be doing if it doesn't
1422 if (atoi(smtp_response) == 503)
1423 report(stderr, GT_("LMTP delivery error on EOM\n"));
1426 GT_("Unexpected non-503 response to LMTP EOM: %s\n"),
1430 * It's not completely clear what to do here. We choose to
1431 * interpret delivery failure here as a transient error,
1432 * the same way SMTP delivery failure is handled. If we're
1433 * wrong, an undead message will get stuck in the queue.
1439 int i, errors, rc = FALSE;
1442 /* eat the RFC2033-required responses, saving errors */
1443 responses = (char **)xmalloc(sizeof(char *) * lmtp_responses);
1444 for (errors = i = 0; i < lmtp_responses; i++)
1446 if ((smtp_err = SMTP_ok(ctl->smtp_socket, ctl->smtphostmode))
1447 == SM_UNRECOVERABLE)
1452 if (smtp_err != SM_OK)
1454 responses[errors] = xstrdup(smtp_response);
1460 rc = TRUE; /* all deliveries succeeded */
1463 * One or more deliveries failed.
1464 * If we can bounce a failures list back to the
1465 * sender, and the postmaster does not want to
1466 * deal with the bounces return TRUE, deleting the
1467 * message from the server so it won't be
1468 * re-forwarded on subsequent poll cycles.
1470 rc = send_bouncemail(ctl, msg, XMIT_ACCEPT,
1471 "LMTP partial delivery failure.\r\n",
1475 for (i = 0; i < errors; i++)
1486 int open_warning_by_mail(struct query *ctl)
1487 /* set up output sink for a mailed warning to calling user */
1492 * Dispatching warning email is a little complicated. The problem is
1493 * that we have to deal with three distinct cases:
1495 * 1. Single-drop running from user account. Warning mail should
1496 * go to the local name for which we're collecting (coincides
1497 * with calling user).
1499 * 2. Single-drop running from root or other privileged ID, with rc
1500 * file generated on the fly (Ken Estes's weird setup...) Mail
1501 * should go to the local name for which we're collecting (does not
1502 * coincide with calling user).
1504 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1505 * member null so this message will fall through to run.postmaster.
1507 * The zero in the reallen element means we won't pass a SIZE
1508 * option to ESMTP; the message length would be more trouble than
1509 * it's worth to compute.
1511 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0, 0};
1514 strlcat(reply.return_path, ctl->smtpaddress ? ctl->smtpaddress :
1515 fetchmailhost, sizeof(reply.return_path));
1517 if (!MULTIDROP(ctl)) /* send to calling user */
1519 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1520 status = open_sink(ctl, &reply, &good, &bad);
1521 free_str_list(&reply.recipients);
1523 else /* send to postmaster */
1524 status = open_sink(ctl, &reply, &good, &bad);
1526 stuff_warning(NULL, ctl, "From: FETCHMAIL-DAEMON@%s",
1527 ctl->smtpaddress ? ctl->smtpaddress : fetchmailhost);
1528 stuff_warning(NULL, ctl, "Date: %s", rfc822timestamp());
1529 stuff_warning(NULL, ctl, "MIME-Version: 1.0");
1530 stuff_warning(NULL, ctl, "Content-Transfer-Encoding: 8bit");
1531 stuff_warning(NULL, ctl, "Content-Type: text/plain; charset=\"%s\"", iana_charset);
1536 /* format and ship a warning message line by mail */
1537 /* if rfc2047charset is non-NULL, encode the line (that is assumed to be
1538 * a header line) as per RFC-2047 using rfc2047charset as the character
1540 #if defined(HAVE_STDARG_H)
1541 void stuff_warning(const char *rfc2047charset, struct query *ctl, const char *fmt, ... )
1543 void stuff_warning(rfc2047charset, ctl, fmt, va_alist)
1544 const char *charset;
1546 const char *fmt; /* printf-style format */
1550 /* make huge -- i18n can bulk up error messages a lot */
1551 char buf[2*MSGBUFSIZE+4];
1555 * stuffline() requires its input to be writeable (for CR stripping),
1556 * so we needed to copy the message to a writeable buffer anyway in
1557 * case it was a string constant. We make a virtue of that necessity
1558 * here by supporting stdargs/varargs.
1560 #if defined(HAVE_STDARG_H)
1565 vsnprintf(buf, sizeof(buf) - 2, fmt, ap);
1568 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1570 /* guard against very long lines */
1571 buf[MSGBUFSIZE+1] = '\r';
1572 buf[MSGBUFSIZE+2] = '\n';
1573 buf[MSGBUFSIZE+3] = '\0';
1575 stuffline(ctl, rfc2047charset != NULL ? rfc2047e(buf, rfc2047charset) : buf);
1578 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1579 /* sign and send mailed warnings */
1581 stuff_warning(NULL, ctl, GT_("-- \nThe Fetchmail Daemon"));
1582 close_sink(ctl, msg, TRUE);
1585 /* sink.c ends here */