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 /* for W* macros after pclose() */
37 #include <sys/types.h>
38 #include <sys/resource.h>
42 #include "fetchmail.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();
297 strlcat(daemon_name, fqdn_of_host, sizeof(daemon_name));
299 /* we need only SMTP for this purpose */
300 if ((sock = SockOpen("localhost", SMTP_PORT, NULL)) == -1)
303 if (SMTP_ok(sock) != SM_OK)
309 if (SMTP_helo(sock, fetchmailhost) != SM_OK
310 || SMTP_from(sock, "<>", (char *)NULL) != SM_OK
311 || SMTP_rcpt(sock, bounce_to) != SM_OK
312 || SMTP_data(sock) != SM_OK)
319 /* our first duty is to keep the sacred foo counters turning... */
320 snprintf(boundary, sizeof(boundary), "foo-mani-padme-hum-%ld-%ld-%ld",
321 (long)getpid(), (long)getppid(), time(NULL));
323 if (outlevel >= O_VERBOSE)
324 report(stdout, GT_("SMTP: (bounce-message body)\n"));
326 /* this will usually go to sylog... */
327 report(stderr, GT_("mail from %s bounced to %s\n"),
328 daemon_name, bounce_to);
331 /* bouncemail headers */
332 SockPrintf(sock, "Subject: Mail delivery failed: returning message to sender\r\n");
333 SockPrintf(sock, "From: Mail Delivery System <%s>\r\n", daemon_name);
334 SockPrintf(sock, "To: %s\r\n", bounce_to);
335 SockPrintf(sock, "MIME-Version: 1.0\r\n");
336 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
337 SockPrintf(sock, "\r\n");
339 /* RFC1892 part 1 -- human-readable message */
340 SockPrintf(sock, "--%s\r\n", boundary);
341 SockPrintf(sock,"Content-Type: text/plain\r\n");
342 SockPrintf(sock, "\r\n");
343 SockPrintf(sock, "This message was created automatically by mail delivery software.\r\n\r\n");
344 SockPrintf(sock, "A message that you sent could not be delivered to one or more of its\r\n");
345 SockPrintf(sock, "recipients. This is a permanent error. The following address(es) failed:\r\n");
346 SockPrintf(sock, "\r\n");
354 for (idp = msg->recipients; idp; idp = idp->next)
356 if (idp->val.status.mark == userclass)
359 SockPrintf(sock, "%s\r\n", rcpt_address (ctl, idp->id, 1));
361 if (nerrors == 1) error = errors[0];
362 else if (nerrors <= nusers)
364 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
367 else error = errors[nusers++];
369 SockPrintf(sock, " SMTP error: %s\r\n\r\n", error);
373 /* RFC1892 part 2 -- machine-readable responses */
374 SockPrintf(sock, "--%s\r\n", boundary);
375 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
376 SockPrintf(sock, "\r\n");
377 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fqdn_of_host);
380 for (idp = msg->recipients; idp; idp = idp->next)
381 if (idp->val.status.mark == userclass)
384 /* Minimum RFC1894 compliance + Diagnostic-Code field */
385 SockPrintf(sock, "\r\n");
386 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n",
387 rcpt_address (ctl, idp->id, 1));
388 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", rfc822timestamp());
389 SockPrintf(sock, "Action: failed\r\n");
392 /* one error applies to all users */
394 else if (nerrors <= nusers)
396 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
400 /* errors correspond 1-1 to selected users */
401 error = errors[nusers++];
403 if (strlen(error) > 9 && isdigit((unsigned char)error[4])
404 && error[5] == '.' && isdigit((unsigned char)error[6])
405 && error[7] == '.' && isdigit((unsigned char)error[8]))
406 /* Enhanced status code available, use it */
407 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
409 /* Enhanced status code not available, fake one */
410 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
411 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
413 SockPrintf(sock, "\r\n");
416 /* RFC1892 part 3 -- headers of undelivered message */
417 SockPrintf(sock, "--%s\r\n", boundary);
418 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
419 SockPrintf(sock, "\r\n");
422 SockWrite(sock, msg->headers, strlen(msg->headers));
423 SockPrintf(sock, "\r\n");
425 SockPrintf(sock, "--%s--\r\n", boundary);
427 if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
438 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
439 /* handle SMTP errors based on the content of SMTP_response */
440 /* returns either PS_REFUSED (to delete message from the server),
441 * or PS_TRANSIENT (keeps the message on the server) */
443 int smtperr = atoi(smtp_response);
448 responses[0] = xstrdup(smtp_response);
452 * Don't do this! It can really mess you up if, for example, you're
453 * reporting an error with a single RCPT TO address among several;
454 * RSET discards the message body and it doesn't get sent to the
457 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
458 if (outlevel >= O_DEBUG)
459 report(stdout, GT_("Saved error is still %d\n"), smtperr);
460 #endif /* __UNUSED */
463 * Note: send_bouncemail message strings are not made subject
464 * to gettext translation because (a) they're going to be
465 * embedded in a text/plain 7bit part, and (b) they're
466 * going to be associated with listener error-response
467 * messages, which are probably in English (none of the
468 * MTAs I know about are internationalized).
470 for( walk = ctl->antispam; walk; walk = walk->next )
471 if ( walk->val.status.num == smtperr )
477 /* if (str_find(&ctl->antispam, smtperr)) */
481 * SMTP listener explicitly refuses to deliver mail
482 * coming from this address, probably due to an
483 * anti-spam domain exclusion. Respect this. Don't
484 * try to ship the message, and don't prevent it from
485 * being deleted. There's no point in bouncing the
486 * email either since most spammers don't put their
487 * real return email address anywhere in the headers
488 * (unless the user insists with the SET SPAMBOUNCE
493 * 571 = sendmail's "unsolicited email refused"
494 * 550 = exim's new antispam response (temporary)
495 * 501 = exim's old antispam response
496 * 554 = Postfix antispam response.
502 snprintf(rejmsg, sizeof(rejmsg),
503 "spam filter or virus scanner rejected message because:\r\n"
504 "%s\r\n", responses[0]);
506 send_bouncemail(ctl, msg, XMIT_ACCEPT,
507 rejmsg, 1, responses);
514 * Suppress error message only if the response specifically
515 * meant `excluded for policy reasons'. We *should* see
516 * an error when the return code is less specific.
519 report(stderr, GT_("%cMTP error: %s\n"),
525 case 552: /* message exceeds fixed maximum message size */
527 * Permanent no-go condition on the
528 * ESMTP server. Don't try to ship the message,
529 * and allow it to be deleted.
532 send_bouncemail(ctl, msg, XMIT_ACCEPT,
533 "This message was too large (SMTP error 552).\r\n",
538 case 553: /* invalid sending domain */
540 * These latter days 553 usually means a spammer is trying to
541 * cover his tracks. We never bouncemail on these, because
542 * (a) the return address is invalid by definition, and
543 * (b) we wouldn't want spammers to get confirmation that
544 * this address is live, anyway.
546 #ifdef __DONT_FEED_THE_SPAMMERS__
548 send_bouncemail(ctl, msg, XMIT_ACCEPT,
549 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
551 #endif /* __DONT_FEED_THE_SPAMMERS__ */
556 /* bounce non-transient errors back to the sender */
557 if (smtperr >= 500 && smtperr <= 599)
559 send_bouncemail(ctl, msg, XMIT_ACCEPT,
560 "General SMTP/ESMTP error.\r\n",
566 * We're going to end up here on 4xx errors, like:
568 * 451: temporarily unable to identify sender (exim)
569 * 452: temporary out-of-queue-space condition on the ESMTP server.
571 * These are temporary errors. Don't try to ship the message,
572 * and suppress deletion so it can be retried on a future
575 * Bouncemail *might* be appropriate here as a delay
576 * notification (note; if we ever add this, we must make
577 * sure the RFC1894 Action field is "delayed" rather than
578 * "failed"). But it's not really necessary because
579 * these are not actual failures, we're very likely to be
580 * able to recover on the next cycle.
583 return(PS_TRANSIENT);
587 static int handle_smtp_report_without_bounce(struct query *ctl, struct msgblk *msg)
588 /* handle SMTP errors based on the content of SMTP_response */
589 /* atleast one PS_TRANSIENT: do not send the bounce mail, keep the mail;
590 * no PS_TRANSIENT, atleast one PS_SUCCESS: send the bounce mail, delete the mail;
591 * no PS_TRANSIENT, no PS_SUCCESS: do not send the bounce mail, delete the mail */
593 int smtperr = atoi(smtp_response);
595 if (str_find(&ctl->antispam, smtperr))
603 report(stderr, GT_("%cMTP error: %s\n"),
609 case 552: /* message exceeds fixed maximum message size */
614 case 553: /* invalid sending domain */
615 #ifdef __DONT_FEED_THE_SPAMMERS__
618 #endif /* __DONT_FEED_THE_SPAMMERS__ */
622 /* bounce non-transient errors back to the sender */
623 if (smtperr >= 500 && smtperr <= 599)
625 return(PS_TRANSIENT);
629 /* these are shared by open_sink and stuffline */
632 int stuffline(struct query *ctl, char *buf)
633 /* ship a line to the given control block's output sink (SMTP server or MDA) */
638 /* The line may contain NUL characters. Find the last char to use
639 * -- the real line termination is the sequence "\n\0".
641 last = buf + 1; /* last[-1] must be valid! */
642 while ((last += strlen(last)) && (last[-1] != '\n'))
645 /* fix message lines that have only \n termination (for qmail) */
648 if (last - 1 == buf || last[-2] != '\r')
657 phase = FORWARDING_WAIT;
660 * SMTP byte-stuffing. We only do this if the protocol does *not*
661 * use .<CR><LF> as EOM. If it does, the server will already have
662 * decorated any . lines it sends back up.
666 if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
671 /* writing to SMTP, leave the byte-stuffing in place */;
674 else /* if (!protocol->delimited) -- not byte-stuffed already */
676 if (!ctl->mda) /* byte-stuff it */
679 SockWrite(ctl->smtp_socket, buf, 1);
682 fwrite(buf, 1, 1, sinkfp);
688 /* we may need to strip carriage returns */
693 for (sp = tp = buf; sp < last; sp++)
701 if (ctl->mda || ctl->bsmtp)
702 n = fwrite(buf, last - buf, 1, sinkfp);
703 else if (ctl->smtp_socket != -1)
704 n = SockWrite(ctl->smtp_socket, buf, last - buf);
711 static int open_bsmtp_sink(struct query *ctl, struct msgblk *msg,
712 int *good_addresses, int *bad_addresses)
713 /* open a BSMTP stream */
717 if (strcmp(ctl->bsmtp, "-") == 0)
720 sinkfp = fopen(ctl->bsmtp, "a");
722 /* see the ap computation under the SMTP branch */
724 "MAIL FROM:%s", (msg->return_path[0]) ? msg->return_path : user);
726 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
727 fputs(" BODY=8BITMIME", sinkfp);
728 else if (ctl->mimemsg & MSG_IS_7BIT)
729 fputs(" BODY=7BIT", sinkfp);
731 /* exim's BSMTP processor does not handle SIZE */
732 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
734 fprintf(sinkfp, "\r\n");
737 * RFC 1123 requires that the domain name part of the
738 * RCPT TO address be "canonicalized", that is a FQDN
739 * or MX but not a CNAME. Some listeners (like exim)
740 * enforce this. Now that we have the actual hostname,
741 * compute what we should canonicalize with.
743 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
746 for (idp = msg->recipients; idp; idp = idp->next)
747 if (idp->val.status.mark == XMIT_ACCEPT)
749 fprintf(sinkfp, "RCPT TO: %s\r\n",
750 rcpt_address (ctl, idp->id, 1));
754 fputs("DATA\r\n", sinkfp);
758 report(stderr, GT_("BSMTP file open or preamble write failed\n"));
765 /* this is experimental and will be removed if double bounces are reported */
766 #define EXPLICIT_BOUNCE_ON_BAD_ADDRESS
769 static const char *is_quad(const char *q)
770 /* Check if the string passed in points to what could be one quad of a
771 * dotted-quad IP address. Requirements are that the string is not a
772 * NULL pointer, begins with a period (which is skipped) or a digit
773 * and ends with a period or a NULL. If these requirements are met, a
774 * pointer to the last character (the period or the NULL character) is
775 * returned; otherwise NULL.
784 for(r=q;isdigit((unsigned char)*r);r++)
786 if ( ((*r) && (*r != '.')) || ((r-q) < 1) || ((r-q)>3) )
788 /* Make sure quad is < 255 */
797 else if (*(q+1) == '5')
807 static int is_dottedquad(const char *hostname)
808 /* Returns a true value if the passed in string looks like an IP
809 * address in dotted-quad form, and a false value otherwise.
813 return ((hostname=is_quad(is_quad(is_quad(is_quad(hostname))))) != NULL) &&
817 static int open_smtp_sink(struct query *ctl, struct msgblk *msg,
818 int *good_addresses, int *bad_addresses /* this must be signed, to prevent endless loop in from_addresses */)
819 /* open an SMTP stream */
823 char options[MSGBUFSIZE];
824 char addr[HOSTLEN+USERNAMELEN+1];
825 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
826 char **from_responses;
827 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
829 int force_transient_error = 0;
833 * Compute ESMTP options.
836 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
837 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
838 strcpy(options, " BODY=8BITMIME");
839 else if (ctl->mimemsg & MSG_IS_7BIT)
840 strcpy(options, " BODY=7BIT");
843 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
844 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
847 * Try to get the SMTP listener to take the Return-Path
848 * address as MAIL FROM. If it won't, fall back on the
849 * remotename and mailserver host. This won't affect replies,
850 * which use the header From address anyway; the MAIL FROM
851 * address is a place for the SMTP listener to send
852 * bouncemail. The point is to guarantee a FQDN in the MAIL
853 * FROM line -- some SMTP listeners, like smail, become
856 * RFC 1123 requires that the domain name part of the
857 * MAIL FROM address be "canonicalized", that is a
858 * FQDN or MX but not a CNAME. We'll assume the Return-Path
859 * header is already in this form here (it certainly
860 * is if rewrite is on). RFC 1123 is silent on whether
861 * a nonexistent hostname part is considered canonical.
863 * This is a potential problem if the MTAs further upstream
864 * didn't pass canonicalized From/Return-Path lines, *and* the
865 * local SMTP listener insists on them.
867 * Handle the case where an upstream MTA is setting a return
868 * path equal to "@". Ghod knows why anyone does this, but
869 * it's been reported to happen in mail from Amazon.com and
872 * Also, if the hostname is a dotted quad, wrap it in square brackets.
873 * Apparently this is required by RFC2821, section 4.1.3.
875 if (!msg->return_path[0] || (msg->return_path[0] == '@'))
877 if (strchr(ctl->remotename,'@') || strchr(ctl->remotename,'!'))
879 snprintf(addr, sizeof(addr), "%s", ctl->remotename);
881 else if (is_dottedquad(ctl->server.truename))
883 snprintf(addr, sizeof(addr), "%s@[%s]", ctl->remotename,
884 ctl->server.truename);
888 snprintf(addr, sizeof(addr),
889 "%s@%s", ctl->remotename, ctl->server.truename);
893 else if (strchr(msg->return_path,'@') || strchr(msg->return_path,'!'))
894 ap = msg->return_path;
895 /* in case Return-Path was "<>" we want to preserve that */
896 else if (strcmp(msg->return_path,"<>") == 0)
897 ap = msg->return_path;
898 else /* in case Return-Path existed but was local */
900 if (is_dottedquad(ctl->server.truename))
902 snprintf(addr, sizeof(addr), "%s@[%s]", msg->return_path,
903 ctl->server.truename);
907 snprintf(addr, sizeof(addr), "%s@%s",
908 msg->return_path, ctl->server.truename);
913 if ((smtp_err = SMTP_from(ctl->smtp_socket, ap, options)) == SM_UNRECOVERABLE)
916 return(PS_TRANSIENT);
918 if (smtp_err != SM_OK)
920 int err = handle_smtp_report(ctl, msg); /* map to PS_TRANSIENT or PS_REFUSED */
922 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
927 * Now list the recipient addressees
930 for (idp = msg->recipients; idp; idp = idp->next)
932 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
933 from_responses = xmalloc(sizeof(char *) * total_addresses);
934 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
935 for (idp = msg->recipients; idp; idp = idp->next)
936 if (idp->val.status.mark == XMIT_ACCEPT)
939 address = rcpt_address (ctl, idp->id, 1);
940 if ((smtp_err = SMTP_rcpt(ctl->smtp_socket, address)) == SM_UNRECOVERABLE)
944 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
945 while (*bad_addresses)
946 free(from_responses[*--bad_addresses]);
947 free(from_responses);
948 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
949 return(PS_TRANSIENT);
951 if (smtp_err == SM_OK)
955 switch (handle_smtp_report_without_bounce(ctl, msg))
958 force_transient_error = 1;
962 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
963 from_responses[*bad_addresses] = xstrdup(smtp_response);
964 strcpy(from_responses[*bad_addresses], smtp_response);
965 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
968 idp->val.status.mark = XMIT_RCPTBAD;
969 if (outlevel >= O_VERBOSE)
971 GT_("%cMTP listener doesn't like recipient address `%s'\n"),
972 ctl->listener, address);
976 if (outlevel >= O_VERBOSE)
978 GT_("%cMTP listener doesn't really like recipient address `%s'\n"),
979 ctl->listener, address);
985 if (force_transient_error) {
986 /* do not risk dataloss due to overengineered multidrop
987 * crap. If one of the recipients returned PS_TRANSIENT,
988 * we return exactly that.
990 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
993 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
995 * This should not be necessary, because the SMTP listener itself
996 * should genrate a bounce for the bad address.
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); /* required by RFC1870 */
1023 if ((smtp_err = SMTP_rcpt(ctl->smtp_socket,
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); /* 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)) == SM_UNRECOVERABLE)
1047 return(PS_TRANSIENT);
1049 if (smtp_err != SM_OK)
1051 int err = handle_smtp_report(ctl, msg);
1052 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
1057 * We need to stash this away in order to know how many
1058 * response lines to expect after the LMTP end-of-message.
1060 lmtp_responses = *good_addresses;
1065 static int open_mda_sink(struct query *ctl, struct msgblk *msg,
1066 int *good_addresses, int *bad_addresses)
1067 /* open a stream to a local MDA */
1071 #endif /* HAVE_SETEUID */
1073 int length = 0, fromlen = 0, nameslen = 0;
1074 char *names = NULL, *before, *after, *from = NULL;
1076 ctl->destaddr = "localhost";
1078 for (idp = msg->recipients; idp; idp = idp->next)
1079 if (idp->val.status.mark == XMIT_ACCEPT)
1080 (*good_addresses)++;
1082 length = strlen(ctl->mda);
1083 before = xstrdup(ctl->mda);
1085 /* get user addresses for %T (or %s for backward compatibility) */
1086 if (strstr(before, "%s") || strstr(before, "%T"))
1089 * We go through this in order to be able to handle very
1090 * long lists of users and (re)implement %s.
1093 for (idp = msg->recipients; idp; idp = idp->next)
1094 if ((idp->val.status.mark == XMIT_ACCEPT))
1095 nameslen += (strlen(idp->id) + 1); /* string + ' ' */
1096 if ((*good_addresses == 0))
1097 nameslen = strlen(run.postmaster);
1099 names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
1100 if (*good_addresses == 0)
1101 strcpy(names, run.postmaster);
1105 for (idp = msg->recipients; idp; idp = idp->next)
1106 if (idp->val.status.mark == XMIT_ACCEPT)
1108 strcat(names, idp->id);
1111 names[--nameslen] = '\0'; /* chop trailing space */
1117 /* get From address for %F */
1118 if (strstr(before, "%F"))
1120 from = xstrdup(msg->return_path);
1124 fromlen = strlen(from);
1127 /* do we have to build an mda string? */
1132 /* find length of resulting mda string */
1134 while ((sp = strstr(sp, "%s"))) {
1135 length += nameslen; /* subtract %s and add '' */
1139 while ((sp = strstr(sp, "%T"))) {
1140 length += nameslen; /* subtract %T and add '' */
1144 while ((sp = strstr(sp, "%F"))) {
1145 length += fromlen; /* subtract %F and add '' */
1149 after = xmalloc(length + 1);
1151 /* copy mda source string to after, while expanding %[sTF] */
1152 for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
1153 if (sp[0] != '%') continue;
1155 /* need to expand? BTW, no here overflow, because in
1156 ** the worst case (end of string) sp[1] == '\0' */
1157 if (sp[1] == 's' || sp[1] == 'T') {
1162 sp++; /* position sp over [sT] */
1163 dp--; /* adjust dp */
1164 } else if (sp[1] == 'F') {
1169 sp++; /* position sp over F */
1170 dp--; /* adjust dp */
1189 if (outlevel >= O_DEBUG)
1190 report(stdout, GT_("about to deliver with: %s\n"), before);
1194 * Arrange to run with user's permissions if we're root.
1195 * This will initialize the ownership of any files the
1196 * MDA creates properly. (The seteuid call is available
1197 * under all BSDs and Linux)
1199 orig_uid = getuid();
1201 #endif /* HAVE_SETEUID */
1203 sinkfp = popen(before, "w");
1208 /* this will fail quietly if we didn't start as root */
1210 #endif /* HAVE_SETEUID */
1214 report(stderr, GT_("MDA open failed\n"));
1219 * We need to disable the normal SIGCHLD handling here because
1220 * sigchld_handler() would reap away the error status, returning
1221 * error status instead of 0 for successful completion.
1223 set_signal_handler(SIGCHLD, SIG_DFL);
1228 int open_sink(struct query *ctl, struct msgblk *msg,
1229 int *good_addresses, int *bad_addresses)
1230 /* set up sinkfp to be an input sink we can ship a message to */
1232 *bad_addresses = *good_addresses = 0;
1234 if (ctl->bsmtp) /* dump to a BSMTP batch file */
1235 return(open_bsmtp_sink(ctl, msg, good_addresses, bad_addresses));
1237 * Try to forward to an SMTP or LMTP listener. If the attempt to
1238 * open a socket fails, fall through to attempt delivery via
1241 else if (!ctl->mda && smtp_open(ctl) != -1)
1242 return(open_smtp_sink(ctl, msg, good_addresses, bad_addresses));
1245 * Awkward case. User didn't specify an MDA. Our attempt to get a
1246 * listener socket failed. Try to cope anyway -- initial configuration
1247 * may have found procmail.
1251 report(stderr, GT_("%cMTP connect to %s failed\n"),
1253 ctl->smtphost ? ctl->smtphost : "localhost");
1255 #ifndef FALLBACK_MDA
1256 /* No fallback MDA declared. Bail out. */
1260 * If user had things set up to forward offsite, no way
1261 * we want to deliver locally!
1263 if (ctl->smtphost && strcmp(ctl->smtphost, "localhost"))
1267 * User was delivering locally. We have a fallback MDA.
1268 * Latch it in place, logging the error, and fall through.
1269 * Set stripcr as we would if MDA had been the initial transport
1271 ctl->mda = FALLBACK_MDA;
1273 ctl->stripcr = TRUE;
1275 report(stderr, GT_("can't raise the listener; falling back to %s"),
1280 if (ctl->mda) /* must deliver through an MDA */
1281 return(open_mda_sink(ctl, msg, good_addresses, bad_addresses));
1286 void release_sink(struct query *ctl)
1287 /* release the per-message output sink, whether it's a pipe or SMTP socket */
1289 if (ctl->bsmtp && sinkfp)
1291 if (strcmp(ctl->bsmtp, "-"))
1294 sinkfp = (FILE *)NULL;
1302 sinkfp = (FILE *)NULL;
1304 deal_with_sigchld(); /* Restore SIGCHLD handling to reap zombies */
1308 int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
1309 /* perform end-of-message actions on the current output sink */
1316 /* close the delivery pipe, we'll reopen before next message */
1319 rc = pclose(sinkfp);
1320 sinkfp = (FILE *)NULL;
1325 deal_with_sigchld(); /* Restore SIGCHLD handling to reap zombies */
1329 if (WIFSIGNALED(rc)) {
1331 GT_("MDA died of signal %d\n"), WTERMSIG(rc));
1332 } else if (WIFEXITED(rc)) {
1334 GT_("MDA returned nonzero status %d\n"), WEXITSTATUS(rc));
1337 GT_("Strange: MDA pclose returned %d, cannot handle at %s:%d\n"), rc, __FILE__, __LINE__);
1343 else if (ctl->bsmtp && sinkfp)
1347 /* implicit disk-full check here... */
1348 fputs(".\r\n", sinkfp);
1349 error = ferror(sinkfp);
1350 if (strcmp(ctl->bsmtp, "-"))
1352 if (fclose(sinkfp) == EOF) error = 1;
1353 sinkfp = (FILE *)NULL;
1358 GT_("Message termination or close of BSMTP file failed\n"));
1364 /* write message terminator */
1365 if ((smtp_err = SMTP_eom(ctl->smtp_socket)) == SM_UNRECOVERABLE)
1370 if (smtp_err != SM_OK)
1372 if (handle_smtp_report(ctl, msg) != PS_REFUSED)
1374 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
1379 report(stderr, GT_("SMTP listener refused delivery\n"));
1380 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
1386 * If this is an SMTP connection, SMTP_eom() ate the response.
1387 * But could be this is an LMTP connection, in which case we have to
1388 * interpret either (a) a single 503 response meaning there
1389 * were no successful RCPT TOs, or (b) a variable number of
1390 * responses, one for each successful RCPT TO. We need to send
1391 * bouncemail on each failed response and then return TRUE anyway,
1392 * otherwise the message will get left in the queue and resent
1393 * to people who got it the first time.
1395 if (ctl->listener == LMTP_MODE)
1397 if (lmtp_responses == 0)
1399 SMTP_ok(ctl->smtp_socket);
1402 * According to RFC2033, 503 is the only legal response
1403 * if no RCPT TO commands succeeded. No error recovery
1404 * is really possible here, as we have no idea what
1405 * insane thing the listener might be doing if it doesn't
1408 if (atoi(smtp_response) == 503)
1409 report(stderr, GT_("LMTP delivery error on EOM\n"));
1412 GT_("Unexpected non-503 response to LMTP EOM: %s\n"),
1416 * It's not completely clear what to do here. We choose to
1417 * interpret delivery failure here as a transient error,
1418 * the same way SMTP delivery failure is handled. If we're
1419 * wrong, an undead message will get stuck in the queue.
1425 int i, errors, rc = FALSE;
1428 /* eat the RFC2033-required responses, saving errors */
1429 responses = xmalloc(sizeof(char *) * lmtp_responses);
1430 for (errors = i = 0; i < lmtp_responses; i++)
1432 if ((smtp_err = SMTP_ok(ctl->smtp_socket)) == SM_UNRECOVERABLE)
1437 if (smtp_err != SM_OK)
1439 responses[errors] = xstrdup(smtp_response);
1445 rc = TRUE; /* all deliveries succeeded */
1448 * One or more deliveries failed.
1449 * If we can bounce a failures list back to the
1450 * sender, and the postmaster does not want to
1451 * deal with the bounces return TRUE, deleting the
1452 * message from the server so it won't be
1453 * re-forwarded on subsequent poll cycles.
1455 rc = send_bouncemail(ctl, msg, XMIT_ACCEPT,
1456 "LMTP partial delivery failure.\r\n",
1460 for (i = 0; i < errors; i++)
1471 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
1472 /* set up output sink for a mailed warning to calling user */
1477 * Dispatching warning email is a little complicated. The problem is
1478 * that we have to deal with three distinct cases:
1480 * 1. Single-drop running from user account. Warning mail should
1481 * go to the local name for which we're collecting (coincides
1482 * with calling user).
1484 * 2. Single-drop running from root or other privileged ID, with rc
1485 * file generated on the fly (Ken Estes's weird setup...) Mail
1486 * should go to the local name for which we're collecting (does not
1487 * coincide with calling user).
1489 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1490 * member null so this message will fall through to run.postmaster.
1492 * The zero in the reallen element means we won't pass a SIZE
1493 * option to ESMTP; the message length would be more trouble than
1494 * it's worth to compute.
1496 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0, 0};
1499 strlcat(reply.return_path, ctl->smtpaddress ? ctl->smtpaddress :
1500 fetchmailhost, sizeof(reply.return_path));
1502 if (!MULTIDROP(ctl)) /* send to calling user */
1504 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1505 status = open_sink(ctl, &reply, &good, &bad);
1506 free_str_list(&reply.recipients);
1508 else /* send to postmaster */
1509 status = open_sink(ctl, &reply, &good, &bad);
1511 stuff_warning(NULL, ctl, "From: FETCHMAIL-DAEMON@%s",
1512 ctl->smtpaddress ? ctl->smtpaddress : fetchmailhost);
1513 stuff_warning(NULL, ctl, "Date: %s", rfc822timestamp());
1514 stuff_warning(NULL, ctl, "MIME-Version: 1.0");
1515 stuff_warning(NULL, ctl, "Content-Transfer-Encoding: 8bit");
1516 stuff_warning(NULL, ctl, "Content-Type: text/plain; charset=\"%s\"", iana_charset);
1521 /* format and ship a warning message line by mail */
1522 /* if rfc2047charset is non-NULL, encode the line (that is assumed to be
1523 * a header line) as per RFC-2047 using rfc2047charset as the character
1525 #if defined(HAVE_STDARG_H)
1526 void stuff_warning(const char *rfc2047charset, struct query *ctl, const char *fmt, ... )
1528 void stuff_warning(rfc2047charset, ctl, fmt, va_alist)
1529 const char *charset;
1531 const char *fmt; /* printf-style format */
1535 /* make huge -- i18n can bulk up error messages a lot */
1536 char buf[2*MSGBUFSIZE+4];
1540 * stuffline() requires its input to be writeable (for CR stripping),
1541 * so we needed to copy the message to a writeable buffer anyway in
1542 * case it was a string constant. We make a virtue of that necessity
1543 * here by supporting stdargs/varargs.
1545 #if defined(HAVE_STDARG_H)
1550 vsnprintf(buf, sizeof(buf) - 2, fmt, ap);
1553 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1555 /* guard against very long lines */
1556 buf[MSGBUFSIZE+1] = '\r';
1557 buf[MSGBUFSIZE+2] = '\n';
1558 buf[MSGBUFSIZE+3] = '\0';
1560 stuffline(ctl, rfc2047charset != NULL ? rfc2047e(buf, rfc2047charset) : buf);
1563 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1564 /* sign and send mailed warnings */
1566 stuff_warning(NULL, ctl, GT_("-- \nThe Fetchmail Daemon"));
1567 close_sink(ctl, msg, TRUE);
1570 /* sink.c ends here */