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);
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 char *parsed_host = NULL;
73 /* maybe it's time to close the socket in order to force delivery */
74 if (last_smtp_ok > 0 && time((time_t *)NULL) - last_smtp_ok > mytimeout)
79 if (NUM_NONZERO(ctl->batchlimit)) {
80 if (batchcount == ctl->batchlimit)
85 /* if no socket to any SMTP host is already set up, try to open one */
86 if (ctl->smtp_socket == -1)
89 * RFC 1123 requires that the domain name in HELO address is a
90 * "valid principal domain name" for the client host. If we're
91 * running in invisible mode, violate this with malice
92 * aforethought in order to make the Received headers and
95 * In fact this code relies on the RFC1123 requirement that the
96 * SMTP listener must accept messages even if verification of the
97 * HELO name fails (RFC1123 section 5.2.5, paragraph 2).
99 * How we compute the true mailhost name to pass to the
100 * listener doesn't affect behavior on RFC1123-violating
101 * listeners that check for name match; we're going to lose
102 * on those anyway because we can never give them a name
103 * that matches the local machine fetchmail is running on.
104 * What it will affect is the listener's logging.
107 const char *id_me = run.invisible ? ctl->server.truename : fetchmailhost;
108 int oldphase = phase;
113 * Run down the SMTP hunt list looking for a server that's up.
114 * Use both explicit hunt entries (value TRUE) and implicit
115 * (default) ones (value FALSE).
118 phase = LISTENER_WAIT;
120 set_timeout(ctl->server.timeout);
121 for (idp = ctl->smtphunt; idp; idp = idp->next)
124 char *portnum = SMTP_PORT;
126 ctl->smtphost = idp->id; /* remember last host tried. */
127 if(ctl->smtphost[0]=='/')
128 ctl->listener = LMTP_MODE;
130 parsed_host = xstrdup(idp->id);
132 if ((cp = strrchr(parsed_host, '/')))
138 if (ctl->smtphost[0]=='/'){
139 if ((ctl->smtp_socket = UnixOpen(ctl->smtphost))==-1)
142 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,
143 ctl->server.plugout)) == -1)
146 /* return immediately for ODMR */
147 if (ctl->server.protocol == P_ODMR)
152 return(ctl->smtp_socket); /* success */
155 /* are we doing SMTP or LMTP? */
156 SMTP_setmode(ctl->listener);
158 /* first, probe for ESMTP */
159 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
160 SMTP_ehlo(ctl->smtp_socket, id_me,
161 ctl->server.esmtp_name, ctl->server.esmtp_password,
162 &ctl->server.esmtp_options) == SM_OK)
166 * RFC 1869 warns that some listeners hang up on a failed EHLO,
167 * so it's safest not to assume the socket will still be good.
171 /* if opening for ESMTP failed, try SMTP */
172 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,
173 ctl->server.plugout)) == -1)
176 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
177 SMTP_helo(ctl->smtp_socket, id_me) == SM_OK)
187 * RFC 1123 requires that the domain name part of the
188 * RCPT TO address be "canonicalized", that is a FQDN
189 * or MX but not a CNAME. Some listeners (like exim)
190 * enforce this. Now that we have the actual hostname,
191 * compute what we should canonicalize with.
193 * make sure we do not forget to drop the /port if
196 if (ctl->listener == LMTP_MODE && !ctl->smtpaddress)
198 if (parsed_host && parsed_host[0] != 0)
199 ctl->destaddr = xstrdup(parsed_host);
201 ctl->destaddr = (ctl->smtphost && ctl->smtphost[0] != '/') ? ctl->smtphost : "localhost";
206 * Here we try to find a correct domain name part for the RCPT
207 * TO address. If smtpaddress is set, no need to guestimate
208 * it. Otherwise, using ctl->smtphost as a base is a good
209 * base, although we may have to strip any port appended to
210 * communicate with SMTP servers that do not listen on the
211 * SMTP port. (benj) */
212 if (ctl->smtpaddress)
213 ctl->destaddr = ctl->smtpaddress;
214 else if (ctl->smtphost && ctl->smtphost[0] != '/')
217 if ((cp = strchr (ctl->smtphost, '/')))
219 /* As an alternate port for smtphost is specified, we
220 need to strip it from domain name. */
221 char *smtpname = xmalloc(cp - ctl->smtphost + 1);
222 strncpy(smtpname, ctl->smtphost, cp - ctl->smtphost +1);
223 cp = strchr(smtpname, '/');
225 ctl->destaddr = smtpname;
228 /* No need to strip port, domain name is smtphost. */
229 ctl->destaddr = ctl->smtphost;
231 /* No smtphost is specified or it is a UNIX socket, then use
232 localhost as a domain part. */
234 ctl->destaddr = "localhost";
237 if (outlevel >= O_DEBUG && ctl->smtp_socket != -1)
238 report(stdout, GT_("forwarding to %s\n"), ctl->smtphost);
241 return(ctl->smtp_socket);
244 static void sanitize(char *s)
249 for (cp = s; (cp = strchr (cp, '\'')); cp++)
253 char *rcpt_address(struct query *ctl, const char *id,
256 static char addr[HOSTLEN+USERNAMELEN+1];
259 snprintf(addr, sizeof (addr), "%s", id);
261 else if (usesmtpname && ctl->smtpname)
263 snprintf(addr, sizeof (addr), "%s", ctl->smtpname);
267 snprintf(addr, sizeof (addr), "%s@%s", id, ctl->destaddr);
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[15 + HOSTLEN] = "MAILER-DAEMON@";
278 char boundary[BUFSIZ], *bounce_to;
280 static char *fqdn_of_host = NULL;
281 const char *md1 = "MAILER-DAEMON", *md2 = "MAILER-DAEMON@";
283 /* don't bounce in reply to undeliverable bounces */
284 if (!msg->return_path[0] ||
285 strcmp(msg->return_path, "<>") == 0 ||
286 strcasecmp(msg->return_path, md1) == 0 ||
287 strncasecmp(msg->return_path, md2, strlen(md2)) == 0)
290 bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
292 SMTP_setmode(SMTP_MODE);
294 /* can't just use fetchmailhost here, it might be localhost */
295 if (fqdn_of_host == NULL)
296 fqdn_of_host = host_fqdn(0); /* can't afford to bail out and
298 strlcat(daemon_name, fqdn_of_host, sizeof(daemon_name));
300 /* we need only SMTP for this purpose */
301 /* XXX FIXME: hardcoding localhost is nonsense if smtphost can be
303 if ((sock = SockOpen("localhost", SMTP_PORT, NULL)) == -1)
306 if (SMTP_ok(sock) != SM_OK)
312 if (SMTP_helo(sock, fetchmailhost) != SM_OK
313 || SMTP_from(sock, "<>", (char *)NULL) != SM_OK
314 || SMTP_rcpt(sock, bounce_to) != SM_OK
315 || SMTP_data(sock) != SM_OK)
322 /* our first duty is to keep the sacred foo counters turning... */
323 snprintf(boundary, sizeof(boundary), "foo-mani-padme-hum-%ld-%ld-%ld",
324 (long)getpid(), (long)getppid(), time(NULL));
326 if (outlevel >= O_VERBOSE)
327 report(stdout, GT_("SMTP: (bounce-message body)\n"));
329 /* this will usually go to sylog... */
330 report(stderr, GT_("mail from %s bounced to %s\n"),
331 daemon_name, bounce_to);
334 /* bouncemail headers */
335 SockPrintf(sock, "Subject: Mail delivery failed: returning message to sender\r\n");
336 SockPrintf(sock, "From: Mail Delivery System <%s>\r\n", daemon_name);
337 SockPrintf(sock, "To: %s\r\n", bounce_to);
338 SockPrintf(sock, "MIME-Version: 1.0\r\n");
339 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
340 SockPrintf(sock, "\r\n");
342 /* RFC1892 part 1 -- human-readable message */
343 SockPrintf(sock, "--%s\r\n", boundary);
344 SockPrintf(sock,"Content-Type: text/plain\r\n");
345 SockPrintf(sock, "\r\n");
346 SockPrintf(sock, "This message was created automatically by mail delivery software.\r\n\r\n");
347 SockPrintf(sock, "A message that you sent could not be delivered to one or more of its\r\n");
348 SockPrintf(sock, "recipients. This is a permanent error. The following address(es) failed:\r\n");
349 SockPrintf(sock, "\r\n");
357 for (idp = msg->recipients; idp; idp = idp->next)
359 if (idp->val.status.mark == userclass)
362 SockPrintf(sock, "%s\r\n", rcpt_address (ctl, idp->id, 1));
364 if (nerrors == 1) error = errors[0];
365 else if (nerrors <= nusers)
367 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
370 else error = errors[nusers++];
372 SockPrintf(sock, " SMTP error: %s\r\n\r\n", error);
376 /* RFC1892 part 2 -- machine-readable responses */
377 SockPrintf(sock, "--%s\r\n", boundary);
378 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
379 SockPrintf(sock, "\r\n");
380 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fqdn_of_host);
383 for (idp = msg->recipients; idp; idp = idp->next)
384 if (idp->val.status.mark == userclass)
387 /* Minimum RFC1894 compliance + Diagnostic-Code field */
388 SockPrintf(sock, "\r\n");
389 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n",
390 rcpt_address (ctl, idp->id, 1));
391 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", rfc822timestamp());
392 SockPrintf(sock, "Action: failed\r\n");
395 /* one error applies to all users */
397 else if (nerrors <= nusers)
399 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
403 /* errors correspond 1-1 to selected users */
404 error = errors[nusers++];
406 if (strlen(error) > 9 && isdigit((unsigned char)error[4])
407 && error[5] == '.' && isdigit((unsigned char)error[6])
408 && error[7] == '.' && isdigit((unsigned char)error[8]))
409 /* Enhanced status code available, use it */
410 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
412 /* Enhanced status code not available, fake one */
413 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
414 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
416 SockPrintf(sock, "\r\n");
419 /* RFC1892 part 3 -- headers of undelivered message */
420 SockPrintf(sock, "--%s\r\n", boundary);
421 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
422 SockPrintf(sock, "\r\n");
425 SockWrite(sock, msg->headers, strlen(msg->headers));
426 SockPrintf(sock, "\r\n");
428 SockPrintf(sock, "--%s--\r\n", boundary);
430 if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
441 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
442 /* handle SMTP errors based on the content of SMTP_response */
443 /* returns either PS_REFUSED (to delete message from the server),
444 * or PS_TRANSIENT (keeps the message on the server) */
446 int smtperr = atoi(smtp_response);
451 responses[0] = xstrdup(smtp_response);
455 * Don't do this! It can really mess you up if, for example, you're
456 * reporting an error with a single RCPT TO address among several;
457 * RSET discards the message body and it doesn't get sent to the
460 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
461 if (outlevel >= O_DEBUG)
462 report(stdout, GT_("Saved error is still %d\n"), smtperr);
463 #endif /* __UNUSED */
466 * Note: send_bouncemail message strings are not made subject
467 * to gettext translation because (a) they're going to be
468 * embedded in a text/plain 7bit part, and (b) they're
469 * going to be associated with listener error-response
470 * messages, which are probably in English (none of the
471 * MTAs I know about are internationalized).
473 for( walk = ctl->antispam; walk; walk = walk->next )
474 if ( walk->val.status.num == smtperr )
480 /* if (str_find(&ctl->antispam, smtperr)) */
484 * SMTP listener explicitly refuses to deliver mail
485 * coming from this address, probably due to an
486 * anti-spam domain exclusion. Respect this. Don't
487 * try to ship the message, and don't prevent it from
488 * being deleted. There's no point in bouncing the
489 * email either since most spammers don't put their
490 * real return email address anywhere in the headers
491 * (unless the user insists with the SET SPAMBOUNCE
496 * 571 = sendmail's "unsolicited email refused"
497 * 550 = exim's new antispam response (temporary)
498 * 501 = exim's old antispam response
499 * 554 = Postfix antispam response.
505 snprintf(rejmsg, sizeof(rejmsg),
506 "spam filter or virus scanner rejected message because:\r\n"
507 "%s\r\n", responses[0]);
509 send_bouncemail(ctl, msg, XMIT_ACCEPT,
510 rejmsg, 1, responses);
517 * Suppress error message only if the response specifically
518 * meant `excluded for policy reasons'. We *should* see
519 * an error when the return code is less specific.
522 report(stderr, GT_("%cMTP error: %s\n"),
528 case 552: /* message exceeds fixed maximum message size */
530 * Permanent no-go condition on the
531 * ESMTP server. Don't try to ship the message,
532 * and allow it to be deleted.
535 send_bouncemail(ctl, msg, XMIT_ACCEPT,
536 "This message was too large (SMTP error 552).\r\n",
541 case 553: /* invalid sending domain */
543 * These latter days 553 usually means a spammer is trying to
544 * cover his tracks. We never bouncemail on these, because
545 * (a) the return address is invalid by definition, and
546 * (b) we wouldn't want spammers to get confirmation that
547 * this address is live, anyway.
549 #ifdef __DONT_FEED_THE_SPAMMERS__
551 send_bouncemail(ctl, msg, XMIT_ACCEPT,
552 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
554 #endif /* __DONT_FEED_THE_SPAMMERS__ */
559 /* bounce non-transient errors back to the sender */
560 if (smtperr >= 500 && smtperr <= 599)
562 send_bouncemail(ctl, msg, XMIT_ACCEPT,
563 "General SMTP/ESMTP error.\r\n",
569 * We're going to end up here on 4xx errors, like:
571 * 451: temporarily unable to identify sender (exim)
572 * 452: temporary out-of-queue-space condition on the ESMTP server.
574 * These are temporary errors. Don't try to ship the message,
575 * and suppress deletion so it can be retried on a future
578 * Bouncemail *might* be appropriate here as a delay
579 * notification (note; if we ever add this, we must make
580 * sure the RFC1894 Action field is "delayed" rather than
581 * "failed"). But it's not really necessary because
582 * these are not actual failures, we're very likely to be
583 * able to recover on the next cycle.
586 return(PS_TRANSIENT);
590 static int handle_smtp_report_without_bounce(struct query *ctl, struct msgblk *msg)
591 /* handle SMTP errors based on the content of SMTP_response */
592 /* atleast one PS_TRANSIENT: do not send the bounce mail, keep the mail;
593 * no PS_TRANSIENT, atleast one PS_SUCCESS: send the bounce mail, delete the mail;
594 * no PS_TRANSIENT, no PS_SUCCESS: do not send the bounce mail, delete the mail */
596 int smtperr = atoi(smtp_response);
598 if (str_find(&ctl->antispam, smtperr))
606 report(stderr, GT_("%cMTP error: %s\n"),
612 case 552: /* message exceeds fixed maximum message size */
617 case 553: /* invalid sending domain */
618 #ifdef __DONT_FEED_THE_SPAMMERS__
621 #endif /* __DONT_FEED_THE_SPAMMERS__ */
625 /* bounce non-transient errors back to the sender */
626 if (smtperr >= 500 && smtperr <= 599)
628 return(PS_TRANSIENT);
632 /* these are shared by open_sink and stuffline */
635 int stuffline(struct query *ctl, char *buf)
636 /* ship a line to the given control block's output sink (SMTP server or MDA) */
641 /* The line may contain NUL characters. Find the last char to use
642 * -- the real line termination is the sequence "\n\0".
644 last = buf + 1; /* last[-1] must be valid! */
645 while ((last += strlen(last)) && (last[-1] != '\n'))
648 /* fix message lines that have only \n termination (for qmail) */
651 if (last - 1 == buf || last[-2] != '\r')
660 phase = FORWARDING_WAIT;
663 * SMTP byte-stuffing. We only do this if the protocol does *not*
664 * use .<CR><LF> as EOM. If it does, the server will already have
665 * decorated any . lines it sends back up.
669 if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
674 /* writing to SMTP, leave the byte-stuffing in place */;
677 else /* if (!protocol->delimited) -- not byte-stuffed already */
679 if (!ctl->mda) /* byte-stuff it */
682 SockWrite(ctl->smtp_socket, buf, 1);
685 fwrite(buf, 1, 1, sinkfp);
691 /* we may need to strip carriage returns */
696 for (sp = tp = buf; sp < last; sp++)
704 if (ctl->mda || ctl->bsmtp)
705 n = fwrite(buf, last - buf, 1, sinkfp);
706 else if (ctl->smtp_socket != -1)
707 n = SockWrite(ctl->smtp_socket, buf, last - buf);
714 static int open_bsmtp_sink(struct query *ctl, struct msgblk *msg,
715 int *good_addresses, int *bad_addresses)
716 /* open a BSMTP stream */
721 if (strcmp(ctl->bsmtp, "-") == 0)
724 sinkfp = fopen(ctl->bsmtp, "a");
726 /* see the ap computation under the SMTP branch */
727 need_anglebrs = (msg->return_path[0] != '<');
730 need_anglebrs ? "<" : "",
731 (msg->return_path[0]) ? msg->return_path : user,
732 need_anglebrs ? ">" : "");
734 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
735 fputs(" BODY=8BITMIME", sinkfp);
736 else if (ctl->mimemsg & MSG_IS_7BIT)
737 fputs(" BODY=7BIT", sinkfp);
739 /* exim's BSMTP processor does not handle SIZE */
740 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
742 fprintf(sinkfp, "\r\n");
745 * RFC 1123 requires that the domain name part of the
746 * RCPT TO address be "canonicalized", that is a FQDN
747 * or MX but not a CNAME. Some listeners (like exim)
748 * enforce this. Now that we have the actual hostname,
749 * compute what we should canonicalize with.
751 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
754 for (idp = msg->recipients; idp; idp = idp->next)
755 if (idp->val.status.mark == XMIT_ACCEPT)
757 fprintf(sinkfp, "RCPT TO:<%s>\r\n",
758 rcpt_address (ctl, idp->id, 1));
762 fputs("DATA\r\n", sinkfp);
766 report(stderr, GT_("BSMTP file open or preamble write failed\n"));
773 /* this is experimental and will be removed if double bounces are reported */
774 #define EXPLICIT_BOUNCE_ON_BAD_ADDRESS
777 static const char *is_quad(const char *q)
778 /* Check if the string passed in points to what could be one quad of a
779 * dotted-quad IP address. Requirements are that the string is not a
780 * NULL pointer, begins with a period (which is skipped) or a digit
781 * and ends with a period or a NULL. If these requirements are met, a
782 * pointer to the last character (the period or the NULL character) is
783 * returned; otherwise NULL.
792 for(r=q;isdigit((unsigned char)*r);r++)
794 if ( ((*r) && (*r != '.')) || ((r-q) < 1) || ((r-q)>3) )
796 /* Make sure quad is < 255 */
805 else if (*(q+1) == '5')
815 static int is_dottedquad(const char *hostname)
816 /* Returns a true value if the passed in string looks like an IP
817 * address in dotted-quad form, and a false value otherwise.
821 return ((hostname=is_quad(is_quad(is_quad(is_quad(hostname))))) != NULL) &&
825 static int open_smtp_sink(struct query *ctl, struct msgblk *msg,
826 int *good_addresses, int *bad_addresses /* this must be signed, to prevent endless loop in from_addresses */)
827 /* open an SMTP stream */
831 char options[MSGBUFSIZE];
832 char addr[HOSTLEN+USERNAMELEN+1];
833 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
834 char **from_responses;
835 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
837 int force_transient_error = 0;
841 * Compute ESMTP options.
844 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
845 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
846 strcpy(options, " BODY=8BITMIME");
847 else if (ctl->mimemsg & MSG_IS_7BIT)
848 strcpy(options, " BODY=7BIT");
851 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
852 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
855 * Try to get the SMTP listener to take the Return-Path
856 * address as MAIL FROM. If it won't, fall back on the
857 * remotename and mailserver host. This won't affect replies,
858 * which use the header From address anyway; the MAIL FROM
859 * address is a place for the SMTP listener to send
860 * bouncemail. The point is to guarantee a FQDN in the MAIL
861 * FROM line -- some SMTP listeners, like smail, become
864 * RFC 1123 requires that the domain name part of the
865 * MAIL FROM address be "canonicalized", that is a
866 * FQDN or MX but not a CNAME. We'll assume the Return-Path
867 * header is already in this form here (it certainly
868 * is if rewrite is on). RFC 1123 is silent on whether
869 * a nonexistent hostname part is considered canonical.
871 * This is a potential problem if the MTAs further upstream
872 * didn't pass canonicalized From/Return-Path lines, *and* the
873 * local SMTP listener insists on them.
875 * Handle the case where an upstream MTA is setting a return
876 * path equal to "@". Ghod knows why anyone does this, but
877 * it's been reported to happen in mail from Amazon.com and
880 * Also, if the hostname is a dotted quad, wrap it in square brackets.
881 * Apparently this is required by RFC2821, section 4.1.3.
883 if (!msg->return_path[0] || (msg->return_path[0] == '@'))
885 if (strchr(ctl->remotename,'@') || strchr(ctl->remotename,'!'))
887 snprintf(addr, sizeof(addr), "%s", ctl->remotename);
889 else if (is_dottedquad(ctl->server.truename))
891 snprintf(addr, sizeof(addr), "%s@[%s]", ctl->remotename,
892 ctl->server.truename);
896 snprintf(addr, sizeof(addr),
897 "%s@%s", ctl->remotename, ctl->server.truename);
901 else if (strchr(msg->return_path,'@') || strchr(msg->return_path,'!'))
902 ap = msg->return_path;
903 /* in case Return-Path was "<>" we want to preserve that */
904 else if (strcmp(msg->return_path,"<>") == 0)
905 ap = msg->return_path;
906 else /* in case Return-Path existed but was local */
908 if (is_dottedquad(ctl->server.truename))
910 snprintf(addr, sizeof(addr), "%s@[%s]", msg->return_path,
911 ctl->server.truename);
915 snprintf(addr, sizeof(addr), "%s@%s",
916 msg->return_path, ctl->server.truename);
921 if ((smtp_err = SMTP_from(ctl->smtp_socket, ap, options)) == SM_UNRECOVERABLE)
924 return(PS_TRANSIENT);
926 if (smtp_err != SM_OK)
928 int err = handle_smtp_report(ctl, msg); /* map to PS_TRANSIENT or PS_REFUSED */
930 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
935 * Now list the recipient addressees
938 for (idp = msg->recipients; idp; idp = idp->next)
940 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
941 from_responses = xmalloc(sizeof(char *) * total_addresses);
942 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
943 for (idp = msg->recipients; idp; idp = idp->next)
944 if (idp->val.status.mark == XMIT_ACCEPT)
947 address = rcpt_address (ctl, idp->id, 1);
948 if ((smtp_err = SMTP_rcpt(ctl->smtp_socket, address)) == SM_UNRECOVERABLE)
952 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
953 while (*bad_addresses)
954 free(from_responses[*--bad_addresses]);
955 free(from_responses);
956 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
957 return(PS_TRANSIENT);
959 if (smtp_err == SM_OK)
963 switch (handle_smtp_report_without_bounce(ctl, msg))
966 force_transient_error = 1;
970 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
971 from_responses[*bad_addresses] = xstrdup(smtp_response);
972 strcpy(from_responses[*bad_addresses], smtp_response);
973 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
976 idp->val.status.mark = XMIT_RCPTBAD;
977 if (outlevel >= O_VERBOSE)
979 GT_("%cMTP listener doesn't like recipient address `%s'\n"),
980 ctl->listener, address);
984 if (outlevel >= O_VERBOSE)
986 GT_("%cMTP listener doesn't really like recipient address `%s'\n"),
987 ctl->listener, address);
993 if (force_transient_error) {
994 /* do not risk dataloss due to overengineered multidrop
995 * crap. If one of the recipients returned PS_TRANSIENT,
996 * we return exactly that.
998 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
1001 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
1003 * This should not be necessary, because the SMTP listener itself
1004 * should genrate a bounce for the bad address.
1007 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
1008 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
1009 *bad_addresses, from_responses);
1010 while (*bad_addresses)
1011 free(from_responses[*--bad_addresses]);
1012 free(from_responses);
1013 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
1016 * It's tempting to do local notification only if bouncemail was
1017 * insufficient -- that is, to add && total_addresses > *bad_addresses
1018 * to the test here. The problem with this theory is that it would
1019 * make initial diagnosis of a broken multidrop configuration very
1020 * hard -- most single-recipient messages would just invisibly bounce.
1022 if (!(*good_addresses))
1024 if (!run.postmaster[0])
1026 if (outlevel >= O_VERBOSE)
1027 report(stderr, GT_("no address matches; no postmaster set.\n"));
1028 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
1031 if ((smtp_err = SMTP_rcpt(ctl->smtp_socket,
1032 rcpt_address (ctl, run.postmaster, 0))) == SM_UNRECOVERABLE)
1035 return(PS_TRANSIENT);
1037 if (smtp_err != SM_OK)
1039 report(stderr, GT_("can't even send to %s!\n"), run.postmaster);
1040 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
1044 if (outlevel >= O_VERBOSE)
1045 report(stderr, GT_("no address matches; forwarding to %s.\n"), run.postmaster);
1049 * Tell the listener we're ready to send data.
1050 * Some listeners (like zmailer) may return antispam errors here.
1052 if ((smtp_err = SMTP_data(ctl->smtp_socket)) == SM_UNRECOVERABLE)
1055 return(PS_TRANSIENT);
1057 if (smtp_err != SM_OK)
1059 int err = handle_smtp_report(ctl, msg);
1060 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
1065 * We need to stash this away in order to know how many
1066 * response lines to expect after the LMTP end-of-message.
1068 lmtp_responses = *good_addresses;
1073 static int open_mda_sink(struct query *ctl, struct msgblk *msg,
1074 int *good_addresses, int *bad_addresses)
1075 /* open a stream to a local MDA */
1079 #endif /* HAVE_SETEUID */
1081 int length = 0, fromlen = 0, nameslen = 0;
1082 char *names = NULL, *before, *after, *from = NULL;
1084 ctl->destaddr = "localhost";
1086 for (idp = msg->recipients; idp; idp = idp->next)
1087 if (idp->val.status.mark == XMIT_ACCEPT)
1088 (*good_addresses)++;
1090 length = strlen(ctl->mda);
1091 before = xstrdup(ctl->mda);
1093 /* get user addresses for %T (or %s for backward compatibility) */
1094 if (strstr(before, "%s") || strstr(before, "%T"))
1097 * We go through this in order to be able to handle very
1098 * long lists of users and (re)implement %s.
1101 for (idp = msg->recipients; idp; idp = idp->next)
1102 if ((idp->val.status.mark == XMIT_ACCEPT))
1103 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
1104 if ((*good_addresses == 0))
1105 nameslen = strlen(run.postmaster);
1107 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
1108 if (*good_addresses == 0)
1109 strcpy(names, run.postmaster);
1113 for (idp = msg->recipients; idp; idp = idp->next)
1114 if (idp->val.status.mark == XMIT_ACCEPT)
1116 strcat(names, idp->id);
1119 names[--nameslen] = '\0'; /* chop trailing space */
1125 /* get From address for %F */
1126 if (strstr(before, "%F"))
1128 from = xstrdup(msg->return_path);
1132 fromlen = strlen(from);
1135 /* do we have to build an mda string? */
1140 /* find length of resulting mda string */
1142 while ((sp = strstr(sp, "%s"))) {
1143 length += nameslen; /* subtract %s and add '' */
1147 while ((sp = strstr(sp, "%T"))) {
1148 length += nameslen; /* subtract %T and add '' */
1152 while ((sp = strstr(sp, "%F"))) {
1153 length += fromlen; /* subtract %F and add '' */
1157 after = xmalloc(length + 1);
1159 /* copy mda source string to after, while expanding %[sTF] */
1160 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
1161 if (sp[0] != '%') continue;
1163 /* need to expand? BTW, no here overflow, because in
1164 ** the worst case (end of string) sp[1] == '\0' */
1165 if (sp[1] == 's' || sp[1] == 'T') {
1170 sp++; /* position sp over [sT] */
1171 dp--; /* adjust dp */
1172 } else if (sp[1] == 'F') {
1177 sp++; /* position sp over F */
1178 dp--; /* adjust dp */
1197 if (outlevel >= O_DEBUG)
1198 report(stdout, GT_("about to deliver with: %s\n"), before);
1202 * Arrange to run with user's permissions if we're root.
1203 * This will initialize the ownership of any files the
1204 * MDA creates properly. (The seteuid call is available
1205 * under all BSDs and Linux)
1207 orig_uid = getuid();
1209 #endif /* HAVE_SETEUID */
1211 sinkfp = popen(before, "w");
1216 /* this will fail quietly if we didn't start as root */
1218 #endif /* HAVE_SETEUID */
1222 report(stderr, GT_("MDA open failed\n"));
1227 * We need to disable the normal SIGCHLD handling here because
1228 * sigchld_handler() would reap away the error status, returning
1229 * error status instead of 0 for successful completion.
1231 set_signal_handler(SIGCHLD, SIG_DFL);
1236 int open_sink(struct query *ctl, struct msgblk *msg,
1237 int *good_addresses, int *bad_addresses)
1238 /* set up sinkfp to be an input sink we can ship a message to */
1240 *bad_addresses = *good_addresses = 0;
1242 if (ctl->bsmtp) /* dump to a BSMTP batch file */
1243 return(open_bsmtp_sink(ctl, msg, good_addresses, bad_addresses));
1245 * Try to forward to an SMTP or LMTP listener. If the attempt to
1246 * open a socket fails, fall through to attempt delivery via
1249 else if (!ctl->mda && smtp_open(ctl) != -1)
1250 return(open_smtp_sink(ctl, msg, good_addresses, bad_addresses));
1253 * Awkward case. User didn't specify an MDA. Our attempt to get a
1254 * listener socket failed. Try to cope anyway -- initial configuration
1255 * may have found procmail.
1259 report(stderr, GT_("%cMTP connect to %s failed\n"),
1261 ctl->smtphost ? ctl->smtphost : "localhost");
1263 #ifndef FALLBACK_MDA
1264 /* No fallback MDA declared. Bail out. */
1268 * If user had things set up to forward offsite, no way
1269 * we want to deliver locally!
1271 if (ctl->smtphost && strcmp(ctl->smtphost, "localhost"))
1275 * User was delivering locally. We have a fallback MDA.
1276 * Latch it in place, logging the error, and fall through.
1277 * Set stripcr as we would if MDA had been the initial transport
1279 ctl->mda = FALLBACK_MDA;
1281 ctl->stripcr = TRUE;
1283 report(stderr, GT_("can't raise the listener; falling back to %s"),
1288 if (ctl->mda) /* must deliver through an MDA */
1289 return(open_mda_sink(ctl, msg, good_addresses, bad_addresses));
1294 void release_sink(struct query *ctl)
1295 /* release the per-message output sink, whether it's a pipe or SMTP socket */
1297 if (ctl->bsmtp && sinkfp)
1299 if (strcmp(ctl->bsmtp, "-"))
1302 sinkfp = (FILE *)NULL;
1310 sinkfp = (FILE *)NULL;
1312 deal_with_sigchld(); /* Restore SIGCHLD handling to reap zombies */
1316 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
1317 /* perform end-of-message actions on the current output sink */
1324 /* close the delivery pipe, we'll reopen before next message */
1327 rc = pclose(sinkfp);
1328 sinkfp = (FILE *)NULL;
1333 deal_with_sigchld(); /* Restore SIGCHLD handling to reap zombies */
1337 if (WIFSIGNALED(rc)) {
1339 GT_("MDA died of signal %d\n"), WTERMSIG(rc));
1340 } else if (WIFEXITED(rc)) {
1342 GT_("MDA returned nonzero status %d\n"), WEXITSTATUS(rc));
1345 GT_("Strange: MDA pclose returned %d, cannot handle at %s:%d\n"), rc, __FILE__, __LINE__);
1351 else if (ctl->bsmtp && sinkfp)
1355 /* implicit disk-full check here... */
1356 fputs(".\r\n", sinkfp);
1357 error = ferror(sinkfp);
1358 if (strcmp(ctl->bsmtp, "-"))
1360 if (fclose(sinkfp) == EOF) error = 1;
1361 sinkfp = (FILE *)NULL;
1366 GT_("Message termination or close of BSMTP file failed\n"));
1372 /* write message terminator */
1373 if ((smtp_err = SMTP_eom(ctl->smtp_socket)) == SM_UNRECOVERABLE)
1378 if (smtp_err != SM_OK)
1380 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
1382 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
1387 report(stderr, GT_("SMTP listener refused delivery\n"));
1388 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
1394 * If this is an SMTP connection, SMTP_eom() ate the response.
1395 * But could be this is an LMTP connection, in which case we have to
1396 * interpret either (a) a single 503 response meaning there
1397 * were no successful RCPT TOs, or (b) a variable number of
1398 * responses, one for each successful RCPT TO. We need to send
1399 * bouncemail on each failed response and then return TRUE anyway,
1400 * otherwise the message will get left in the queue and resent
1401 * to people who got it the first time.
1403 if (ctl->listener == LMTP_MODE)
1405 if (lmtp_responses == 0)
1407 SMTP_ok(ctl->smtp_socket);
1410 * According to RFC2033, 503 is the only legal response
1411 * if no RCPT TO commands succeeded. No error recovery
1412 * is really possible here, as we have no idea what
1413 * insane thing the listener might be doing if it doesn't
1416 if (atoi(smtp_response) == 503)
1417 report(stderr, GT_("LMTP delivery error on EOM\n"));
1420 GT_("Unexpected non-503 response to LMTP EOM: %s\n"),
1424 * It's not completely clear what to do here. We choose to
1425 * interpret delivery failure here as a transient error,
1426 * the same way SMTP delivery failure is handled. If we're
1427 * wrong, an undead message will get stuck in the queue.
1433 int i, errors, rc = FALSE;
1436 /* eat the RFC2033-required responses, saving errors */
1437 responses = xmalloc(sizeof(char *) * lmtp_responses);
1438 for (errors = i = 0; i < lmtp_responses; i++)
1440 if ((smtp_err = SMTP_ok(ctl->smtp_socket)) == SM_UNRECOVERABLE)
1445 if (smtp_err != SM_OK)
1447 responses[errors] = xstrdup(smtp_response);
1453 rc = TRUE; /* all deliveries succeeded */
1456 * One or more deliveries failed.
1457 * If we can bounce a failures list back to the
1458 * sender, and the postmaster does not want to
1459 * deal with the bounces return TRUE, deleting the
1460 * message from the server so it won't be
1461 * re-forwarded on subsequent poll cycles.
1463 rc = send_bouncemail(ctl, msg, XMIT_ACCEPT,
1464 "LMTP partial delivery failure.\r\n",
1468 for (i = 0; i < errors; i++)
1479 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
1480 /* set up output sink for a mailed warning to calling user */
1485 * Dispatching warning email is a little complicated. The problem is
1486 * that we have to deal with three distinct cases:
1488 * 1. Single-drop running from user account. Warning mail should
1489 * go to the local name for which we're collecting (coincides
1490 * with calling user).
1492 * 2. Single-drop running from root or other privileged ID, with rc
1493 * file generated on the fly (Ken Estes's weird setup...) Mail
1494 * should go to the local name for which we're collecting (does not
1495 * coincide with calling user).
1497 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1498 * member null so this message will fall through to run.postmaster.
1500 * The zero in the reallen element means we won't pass a SIZE
1501 * option to ESMTP; the message length would be more trouble than
1502 * it's worth to compute.
1504 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0, 0};
1507 strlcat(reply.return_path, ctl->smtpaddress ? ctl->smtpaddress :
1508 fetchmailhost, sizeof(reply.return_path));
1510 if (!MULTIDROP(ctl)) /* send to calling user */
1512 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1513 status = open_sink(ctl, &reply, &good, &bad);
1514 free_str_list(&reply.recipients);
1516 else /* send to postmaster */
1517 status = open_sink(ctl, &reply, &good, &bad);
1519 stuff_warning(NULL, ctl, "From: FETCHMAIL-DAEMON@%s",
1520 ctl->smtpaddress ? ctl->smtpaddress : fetchmailhost);
1521 stuff_warning(NULL, ctl, "Date: %s", rfc822timestamp());
1522 stuff_warning(NULL, ctl, "MIME-Version: 1.0");
1523 stuff_warning(NULL, ctl, "Content-Transfer-Encoding: 8bit");
1524 stuff_warning(NULL, ctl, "Content-Type: text/plain; charset=\"%s\"", iana_charset);
1529 /* format and ship a warning message line by mail */
1530 /* if rfc2047charset is non-NULL, encode the line (that is assumed to be
1531 * a header line) as per RFC-2047 using rfc2047charset as the character
1533 #if defined(HAVE_STDARG_H)
1534 void stuff_warning(const char *rfc2047charset, struct query *ctl, const char *fmt, ... )
1536 void stuff_warning(rfc2047charset, ctl, fmt, va_alist)
1537 const char *charset;
1539 const char *fmt; /* printf-style format */
1543 /* make huge -- i18n can bulk up error messages a lot */
1544 char buf[2*MSGBUFSIZE+4];
1548 * stuffline() requires its input to be writeable (for CR stripping),
1549 * so we needed to copy the message to a writeable buffer anyway in
1550 * case it was a string constant. We make a virtue of that necessity
1551 * here by supporting stdargs/varargs.
1553 #if defined(HAVE_STDARG_H)
1558 vsnprintf(buf, sizeof(buf) - 2, fmt, ap);
1561 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1563 /* guard against very long lines */
1564 buf[MSGBUFSIZE+1] = '\r';
1565 buf[MSGBUFSIZE+2] = '\n';
1566 buf[MSGBUFSIZE+3] = '\0';
1568 stuffline(ctl, rfc2047charset != NULL ? rfc2047e(buf, rfc2047charset) : buf);
1571 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1572 /* sign and send mailed warnings */
1574 stuff_warning(NULL, ctl, GT_("-- \nThe Fetchmail Daemon"));
1575 close_sink(ctl, msg, TRUE);
1578 /* sink.c ends here */