2 * sink.c -- forwarding/delivery support for fetchmail
4 * The interface of this module (open_sink(), stuff_line(), close_sink(),
5 * release_sink()) seals off the delivery logic from the protocol machine,
6 * so the latter won't have to care whether it's shipping to an [SL]MTP
7 * listener daemon or an MDA pipe.
9 * Copyright 1998 by Eric S. Raymond
10 * For license terms, see the file COPYING in this directory.
21 #endif /* HAVE_MEMORY_H */
22 #if defined(STDC_HEADERS)
25 #if defined(HAVE_UNISTD_H)
28 #if defined(HAVE_STDARG_H)
36 /* for W* macros after pclose() */
38 #include <sys/types.h>
40 #include <sys/resource.h>
44 #include "fetchmail.h"
49 /* BSD portability hack...I know, this is an ugly place to put it */
50 #if !defined(SIGCHLD) && defined(SIGCLD)
51 #define SIGCHLD SIGCLD
54 /* makes the open_sink()/close_sink() pair non-reentrant */
55 static int lmtp_responses;
57 void smtp_close(struct query *ctl, int sayquit)
58 /* close the socket to SMTP server */
60 if (ctl->smtp_socket != -1)
63 SMTP_quit(ctl->smtp_socket);
64 SockClose(ctl->smtp_socket);
65 ctl->smtp_socket = -1;
70 int smtp_open(struct query *ctl)
71 /* try to open a socket to the appropriate SMTP server for this query */
73 char *parsed_host = NULL;
75 /* maybe it's time to close the socket in order to force delivery */
76 if (last_smtp_ok > 0 && time((time_t *)NULL) - last_smtp_ok > mytimeout)
81 if (NUM_NONZERO(ctl->batchlimit)) {
82 if (batchcount == ctl->batchlimit)
87 /* if no socket to any SMTP host is already set up, try to open one */
88 if (ctl->smtp_socket == -1)
91 * RFC 1123 requires that the domain name in HELO address is a
92 * "valid principal domain name" for the client host. If we're
93 * running in invisible mode, violate this with malice
94 * aforethought in order to make the Received headers and
97 * In fact this code relies on the RFC1123 requirement that the
98 * SMTP listener must accept messages even if verification of the
99 * HELO name fails (RFC1123 section 5.2.5, paragraph 2).
101 * How we compute the true mailhost name to pass to the
102 * listener doesn't affect behavior on RFC1123-violating
103 * listeners that check for name match; we're going to lose
104 * on those anyway because we can never give them a name
105 * that matches the local machine fetchmail is running on.
106 * What it will affect is the listener's logging.
109 const char *id_me = run.invisible ? ctl->server.truename : fetchmailhost;
110 int oldphase = phase;
115 * Run down the SMTP hunt list looking for a server that's up.
116 * Use both explicit hunt entries (value TRUE) and implicit
117 * (default) ones (value FALSE).
120 phase = LISTENER_WAIT;
122 set_timeout(ctl->server.timeout);
123 for (idp = ctl->smtphunt; idp; idp = idp->next)
127 char *portnum = SMTP_PORT;
129 int portnum = SMTP_PORT;
130 #endif /* INET6_ENABLE */
132 xalloca(parsed_host, char *, strlen(idp->id) + 1);
134 ctl->smtphost = idp->id; /* remember last host tried. */
135 if(ctl->smtphost[0]=='/')
136 ctl->listener = LMTP_MODE;
138 strcpy(parsed_host, idp->id);
139 if ((cp = strrchr(parsed_host, '/')))
146 #endif /* INET6_ENABLE */
149 if (ctl->smtphost[0]=='/'){
150 if ((ctl->smtp_socket = UnixOpen(ctl->smtphost))==-1)
153 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
154 ctl->server.plugout)) == -1)
157 /* return immediately for ODMR */
158 if (ctl->server.protocol == P_ODMR)
162 return(ctl->smtp_socket); /* success */
165 /* are we doing SMTP or LMTP? */
166 SMTP_setmode(ctl->listener);
168 /* first, probe for ESMTP */
169 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
170 SMTP_ehlo(ctl->smtp_socket, id_me,
171 ctl->server.esmtp_name, ctl->server.esmtp_password,
172 &ctl->server.esmtp_options) == SM_OK)
176 * RFC 1869 warns that some listeners hang up on a failed EHLO,
177 * so it's safest not to assume the socket will still be good.
181 /* if opening for ESMTP failed, try SMTP */
182 if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
183 ctl->server.plugout)) == -1)
186 if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
187 SMTP_helo(ctl->smtp_socket, id_me) == SM_OK)
197 * RFC 1123 requires that the domain name part of the
198 * RCPT TO address be "canonicalized", that is a FQDN
199 * or MX but not a CNAME. Some listeners (like exim)
200 * enforce this. Now that we have the actual hostname,
201 * compute what we should canonicalize with.
203 * make sure we do not forget to drop the /port if
206 if (ctl->listener == LMTP_MODE && !ctl->smtpaddress)
208 if (parsed_host && parsed_host[0] != 0)
209 ctl->destaddr = xstrdup(parsed_host);
211 ctl->destaddr = (ctl->smtphost && ctl->smtphost[0] != '/') ? ctl->smtphost : "localhost";
216 * Here we try to find a correct domain name part for the RCPT
217 * TO address. If smtpaddress is set, no need to guestimate
218 * it. Otherwise, using ctl->smtphost as a base is a good
219 * base, although we may have to strip any port appended to
220 * communicate with SMTP servers that do not listen on the
221 * SMTP port. (benj) */
222 if (ctl->smtpaddress)
223 ctl->destaddr = ctl->smtpaddress;
224 else if (ctl->smtphost && ctl->smtphost[0] != '/')
227 if (cp = strchr (ctl->smtphost, '/'))
229 /* As an alternate port for smtphost is specified, we
230 need to strip it from domain name. */
232 xalloca(smtpname, char *, cp - ctl->smtphost + 1);
233 strncpy(smtpname, ctl->smtphost, cp - ctl->smtphost +1);
234 cp = strchr(smtpname, '/');
236 ctl->destaddr = smtpname;
239 /* No need to strip port, domain name is smtphost. */
240 ctl->destaddr = ctl->smtphost;
242 /* No smtphost is specified or it is a UNIX socket, then use
243 localhost as a domain part. */
245 ctl->destaddr = "localhost";
248 if (outlevel >= O_DEBUG && ctl->smtp_socket != -1)
249 report(stdout, GT_("forwarding to %s\n"), ctl->smtphost);
251 return(ctl->smtp_socket);
254 static void sanitize(char *s)
259 for (cp = s; (cp = strchr (cp, '\'')); cp++)
263 char *rcpt_address(struct query *ctl, const char *id,
266 static char addr[HOSTLEN+USERNAMELEN+1];
270 snprintf(addr, sizeof (addr), "%s", id);
272 sprintf(addr, "%s", id);
273 #endif /* HAVE_SNPRINTF */
275 else if (usesmtpname && ctl->smtpname)
278 snprintf(addr, sizeof (addr), "%s", ctl->smtpname);
280 sprintf(addr, "%s", ctl->smtpname);
281 #endif /* HAVE_SNPRINTF */
286 snprintf(addr, sizeof (addr), "%s@%s", id, ctl->destaddr);
288 sprintf(addr, "%s@%s", id, ctl->destaddr);
289 #endif /* HAVE_SNPRINTF */
294 static int send_bouncemail(struct query *ctl, struct msgblk *msg,
295 int userclass, char *message,
296 int nerrors, char *errors[])
297 /* bounce back an error report a la RFC 1892 */
299 char daemon_name[18 + HOSTLEN] = "FETCHMAIL-DAEMON@";
300 char boundary[BUFSIZ], *bounce_to;
302 static char *fqdn_of_host = NULL;
303 const char *md1 = "MAILER-DAEMON", *md2 = "MAILER-DAEMON@";
305 /* don't bounce in reply to undeliverable bounces */
306 if (!msg->return_path[0] ||
307 strcmp(msg->return_path, "<>") == 0 ||
308 strcasecmp(msg->return_path, md1) == 0 ||
309 strncasecmp(msg->return_path, md2, strlen(md2)) == 0)
312 bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
314 SMTP_setmode(SMTP_MODE);
316 /* can't just use fetchmailhost here, it might be localhost */
317 if (fqdn_of_host == NULL)
318 fqdn_of_host = host_fqdn();
319 strcat(daemon_name, fqdn_of_host);
321 /* we need only SMTP for this purpose */
322 if ((sock = SockOpen("localhost", SMTP_PORT, NULL, NULL)) == -1)
325 if (SMTP_ok(sock) != SM_OK)
331 if (SMTP_helo(sock, fetchmailhost) != SM_OK
332 || SMTP_from(sock, daemon_name, (char *)NULL) != SM_OK
333 || SMTP_rcpt(sock, bounce_to) != SM_OK
334 || SMTP_data(sock) != SM_OK)
341 /* our first duty is to keep the sacred foo counters turning... */
343 snprintf(boundary, sizeof(boundary),
346 #endif /* HAVE_SNPRINTF */
347 "foo-mani-padme-hum-%d-%d-%ld",
348 (int)getpid(), (int)getppid(), time((time_t *)NULL));
350 if (outlevel >= O_VERBOSE)
351 report(stdout, GT_("SMTP: (bounce-message body)\n"));
353 /* this will usually go to sylog... */
354 report(stderr, GT_("mail from %s bounced to %s\n"),
355 daemon_name, bounce_to);
357 /* bouncemail headers */
358 SockPrintf(sock, "Return-Path: <>\r\n");
359 SockPrintf(sock, "From: %s\r\n", daemon_name);
360 SockPrintf(sock, "To: %s\r\n", bounce_to);
361 SockPrintf(sock, "MIME-Version: 1.0\r\n");
362 SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
363 SockPrintf(sock, "\r\n");
365 /* RFC1892 part 1 -- human-readable message */
366 SockPrintf(sock, "--%s\r\n", boundary);
367 SockPrintf(sock,"Content-Type: text/plain\r\n");
368 SockPrintf(sock, "\r\n");
369 SockWrite(sock, message, strlen(message));
370 SockPrintf(sock, "\r\n");
371 SockPrintf(sock, "\r\n");
378 /* RFC1892 part 2 -- machine-readable responses */
379 SockPrintf(sock, "--%s\r\n", boundary);
380 SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
381 SockPrintf(sock, "\r\n");
382 SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fetchmailhost);
385 for (idp = msg->recipients; idp; idp = idp->next)
386 if (idp->val.status.mark == userclass)
389 /* Minimum RFC1894 compliance + Diagnostic-Code field */
390 SockPrintf(sock, "\r\n");
391 SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n",
392 rcpt_address (ctl, idp->id, 1));
393 SockPrintf(sock, "Last-Attempt-Date: %s\r\n", rfc822timestamp());
394 SockPrintf(sock, "Action: failed\r\n");
397 /* one error applies to all users */
399 else if (nerrors <= nusers)
401 SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
405 /* errors correspond 1-1 to selected users */
406 error = errors[nusers++];
408 if (strlen(error) > 9 && isdigit(error[4])
409 && error[5] == '.' && isdigit(error[6])
410 && error[7] == '.' && isdigit(error[8]))
411 /* Enhanced status code available, use it */
412 SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
414 /* Enhanced status code not available, fake one */
415 SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
416 SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
418 SockPrintf(sock, "\r\n");
421 /* RFC1892 part 3 -- headers of undelivered message */
422 SockPrintf(sock, "--%s\r\n", boundary);
423 SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
424 SockPrintf(sock, "\r\n");
427 SockWrite(sock, msg->headers, strlen(msg->headers));
428 SockPrintf(sock, "\r\n");
430 SockPrintf(sock, "--%s--\r\n", boundary);
432 if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
443 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
444 /* handle SMTP errors based on the content of SMTP_response */
445 /* return of PS_REFUSED deletes mail from the server; PS_TRANSIENT keeps it */
447 int smtperr = atoi(smtp_response);
452 xalloca(responses[0], char *, strlen(smtp_response)+1);
453 strcpy(responses[0], smtp_response);
457 * Don't do this! It can really mess you up if, for example, you're
458 * reporting an error with a single RCPT TO address among several;
459 * RSET discards the message body and it doesn't get sent to the
462 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
463 if (outlevel >= O_DEBUG)
464 report(stdout, GT_("Saved error is still %d\n"), smtperr);
465 #endif /* __UNUSED */
468 * Note: send_bouncemail message strings are not made subject
469 * to gettext translation because (a) they're going to be
470 * embedded in a text/plain 7bit part, and (b) they're
471 * going to be associated with listener error-response
472 * messages, which are probably in English (none of the
473 * MTAs I know about are internationalized).
475 for( walk = ctl->antispam; walk; walk = walk->next )
476 if ( walk->val.status.num == smtperr )
482 /* if (str_find(&ctl->antispam, smtperr)) */
486 * SMTP listener explicitly refuses to deliver mail
487 * coming from this address, probably due to an
488 * anti-spam domain exclusion. Respect this. Don't
489 * try to ship the message, and don't prevent it from
490 * being deleted. There's no point in bouncing the
491 * email either since most spammers don't put their
492 * real return email address anywhere in the headers
493 * (unless the user insists with the SET SPAMBOUNCE
498 * 571 = sendmail's "unsolicited email refused"
499 * 550 = exim's new antispam response (temporary)
500 * 501 = exim's old antispam response
501 * 554 = Postfix antispam response.
508 snprintf(rejmsg, sizeof(rejmsg),
511 #endif /* HAVE_SNPRINTF */
512 "spam filter or virus scanner rejected message because:\r\n"
513 "%s\r\n", responses[0]);
515 send_bouncemail(ctl, msg, XMIT_ACCEPT,
516 rejmsg, 1, responses);
522 * Suppress error message only if the response specifically
523 * meant `excluded for policy reasons'. We *should* see
524 * an error when the return code is less specific.
527 report(stderr, GT_("%cMTP error: %s\n"),
533 case 552: /* message exceeds fixed maximum message size */
535 * Permanent no-go condition on the
536 * ESMTP server. Don't try to ship the message,
537 * and allow it to be deleted.
540 send_bouncemail(ctl, msg, XMIT_ACCEPT,
541 "This message was too large (SMTP error 552).\r\n",
545 case 553: /* invalid sending domain */
547 * These latter days 553 usually means a spammer is trying to
548 * cover his tracks. We never bouncemail on these, because
549 * (a) the return address is invalid by definition, and
550 * (b) we wouldn't want spammers to get confirmation that
551 * this address is live, anyway.
553 #ifdef __DONT_FEED_THE_SPAMMERS__
555 send_bouncemail(ctl, msg, XMIT_ACCEPT,
556 "Invalid address in MAIL FROM (SMTP error 553).\r\n",
558 #endif /* __DONT_FEED_THE_SPAMMERS__ */
562 /* bounce non-transient errors back to the sender */
563 if (smtperr >= 500 && smtperr <= 599)
565 send_bouncemail(ctl, msg, XMIT_ACCEPT,
566 "General SMTP/ESMTP error.\r\n",
571 * We're going to end up here on 4xx errors, like:
573 * 451: temporarily unable to identify sender (exim)
574 * 452: temporary out-of-queue-space condition on the ESMTP server.
576 * These are temporary errors. Don't try to ship the message,
577 * and suppress deletion so it can be retried on a future
580 * Bouncemail *might* be appropriate here as a delay
581 * notification (note; if we ever add this, we must make
582 * sure the RFC1894 Action field is "delayed" rather than
583 * "failed"). But it's not really necessary because
584 * these are not actual failures, we're very likely to be
585 * able to recover on the next cycle.
587 return(PS_TRANSIENT);
591 static int handle_smtp_report_without_bounce(struct query *ctl, struct msgblk *msg)
592 /* handle SMTP errors based on the content of SMTP_response */
593 /* atleast one PS_TRANSIENT: do not send the bounce mail, keep the mail;
594 * no PS_TRANSIENT, atleast one PS_SUCCESS: send the bounce mail, delete the mail;
595 * no PS_TRANSIENT, no PS_SUCCESS: do not send the bounce mail, delete the mail */
597 int smtperr = atoi(smtp_response);
599 if (str_find(&ctl->antispam, smtperr))
607 report(stderr, GT_("%cMTP error: %s\n"),
613 case 552: /* message exceeds fixed maximum message size */
618 case 553: /* invalid sending domain */
619 #ifdef __DONT_FEED_THE_SPAMMERS__
622 #endif /* __DONT_FEED_THE_SPAMMERS__ */
626 /* bounce non-transient errors back to the sender */
627 if (smtperr >= 500 && smtperr <= 599)
629 return(PS_TRANSIENT);
633 /* these are shared by open_sink and stuffline */
636 int stuffline(struct query *ctl, char *buf)
637 /* ship a line to the given control block's output sink (SMTP server or MDA) */
642 /* The line may contain NUL characters. Find the last char to use
643 * -- the real line termination is the sequence "\n\0".
645 last = buf + 1; /* last[-1] must be valid! */
646 while ((last += strlen(last)) && (last[-1] != '\n'))
649 /* fix message lines that have only \n termination (for qmail) */
652 if (last - 1 == buf || last[-2] != '\r')
661 phase = FORWARDING_WAIT;
664 * SMTP byte-stuffing. We only do this if the protocol does *not*
665 * use .<CR><LF> as EOM. If it does, the server will already have
666 * decorated any . lines it sends back up.
670 if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
675 /* 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, 1, last - buf, 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 */
720 if (strcmp(ctl->bsmtp, "-") == 0)
723 sinkfp = fopen(ctl->bsmtp, "a");
725 /* see the ap computation under the SMTP branch */
727 "MAIL FROM: %s", (msg->return_path[0]) ? msg->return_path : user);
729 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
730 fputs(" BODY=8BITMIME", sinkfp);
731 else if (ctl->mimemsg & MSG_IS_7BIT)
732 fputs(" BODY=7BIT", sinkfp);
734 /* exim's BSMTP processor does not handle SIZE */
735 /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
737 fprintf(sinkfp, "\r\n");
740 * RFC 1123 requires that the domain name part of the
741 * RCPT TO address be "canonicalized", that is a FQDN
742 * or MX but not a CNAME. Some listeners (like exim)
743 * enforce this. Now that we have the actual hostname,
744 * compute what we should canonicalize with.
746 ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
749 for (idp = msg->recipients; idp; idp = idp->next)
750 if (idp->val.status.mark == XMIT_ACCEPT)
752 fprintf(sinkfp, "RCPT TO: %s\r\n",
753 rcpt_address (ctl, idp->id, 1));
757 fputs("DATA\r\n", sinkfp);
761 report(stderr, GT_("BSMTP file open or preamble write failed\n"));
768 /* this is experimental and will be removed if double bounces are reported */
769 #define EXPLICIT_BOUNCE_ON_BAD_ADDRESS
772 static const char *is_quad(const char *q)
773 /* Check if the string passed in points to what could be one quad of a
774 * dotted-quad IP address. Requirements are that the string is not a
775 * NULL pointer, begins with a period (which is skipped) or a digit
776 * and ends with a period or a NULL. If these requirements are met, a
777 * pointer to the last character (the period or the NULL character) is
778 * returned; otherwise NULL.
787 for(r=q;isdigit(*r);r++)
789 if ( ((*r) && (*r != '.')) || ((r-q) < 1) || ((r-q)>3) )
791 /* Make sure quad is < 255 */
800 else if (*(q+1) == '5')
810 static int is_dottedquad(const char *hostname)
811 /* Returns a true value if the passed in string looks like an IP
812 * address in dotted-quad form, and a false value otherwise.
816 return ((hostname=is_quad(is_quad(is_quad(is_quad(hostname))))) != NULL) &&
820 static int open_smtp_sink(struct query *ctl, struct msgblk *msg,
821 int *good_addresses, int *bad_addresses)
822 /* open an SMTP stream */
826 char options[MSGBUFSIZE];
827 char addr[HOSTLEN+USERNAMELEN+1];
828 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
829 char **from_responses;
830 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
832 int force_transient_error = 0;
836 * Compute ESMTP options.
839 if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
840 if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
841 strcpy(options, " BODY=8BITMIME");
842 else if (ctl->mimemsg & MSG_IS_7BIT)
843 strcpy(options, " BODY=7BIT");
846 if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
847 sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
850 * Try to get the SMTP listener to take the Return-Path
851 * address as MAIL FROM. If it won't, fall back on the
852 * remotename and mailserver host. This won't affect replies,
853 * which use the header From address anyway; the MAIL FROM
854 * address is a place for the SMTP listener to send
855 * bouncemail. The point is to guarantee a FQDN in the MAIL
856 * FROM line -- some SMTP listeners, like smail, become
859 * RFC 1123 requires that the domain name part of the
860 * MAIL FROM address be "canonicalized", that is a
861 * FQDN or MX but not a CNAME. We'll assume the Return-Path
862 * header is already in this form here (it certainly
863 * is if rewrite is on). RFC 1123 is silent on whether
864 * a nonexistent hostname part is considered canonical.
866 * This is a potential problem if the MTAs further upstream
867 * didn't pass canonicalized From/Return-Path lines, *and* the
868 * local SMTP listener insists on them.
870 * Handle the case where an upstream MTA is setting a return
871 * path equal to "@". Ghod knows why anyone does this, but
872 * it's been reported to happen in mail from Amazon.com and
875 * Also, if the hostname is a dotted quad, wrap it in square brackets.
876 * Apparently this is required by RFC2821, section 4.1.3.
878 if (!msg->return_path[0] || (msg->return_path[0] == '@'))
880 if (is_dottedquad(ctl->server.truename))
883 snprintf(addr, sizeof(addr),
886 #endif /* HAVE_SNPRINTF */
887 "%s@[%s]", ctl->remotename, ctl->server.truename);
892 snprintf(addr, sizeof(addr),
895 #endif /* HAVE_SNPRINTF */
896 "%s@%s", ctl->remotename, ctl->server.truename);
900 else if (strchr(msg->return_path,'@') || strchr(msg->return_path,'!'))
901 ap = msg->return_path;
902 /* in case Return-Path was "<>" we want to preserve that */
903 else if (strcmp(msg->return_path,"<>") == 0)
904 ap = msg->return_path;
905 else /* in case Return-Path existed but was local */
907 if (is_dottedquad(ctl->server.truename))
910 snprintf(addr, sizeof(addr),
913 #endif /* HAVE_SNPRINTF */
914 "%s@[%s]", msg->return_path, ctl->server.truename);
919 snprintf(addr, sizeof(addr),
922 #endif /* HAVE_SNPRINTF */
923 "%s@%s", msg->return_path, ctl->server.truename);
928 if ((smtp_err = SMTP_from(ctl->smtp_socket, ap, options)) == SM_UNRECOVERABLE)
931 return(PS_TRANSIENT);
933 if (smtp_err != SM_OK)
935 int err = handle_smtp_report(ctl, msg);
937 SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
942 * Now list the recipient addressees
945 for (idp = msg->recipients; idp; idp = idp->next)
947 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
948 xalloca(from_responses, char **, sizeof(char *) * total_addresses);
949 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
950 for (idp = msg->recipients; idp; idp = idp->next)
951 if (idp->val.status.mark == XMIT_ACCEPT)
954 address = rcpt_address (ctl, idp->id, 1);
955 if ((smtp_err = SMTP_rcpt(ctl->smtp_socket, address)) == SM_UNRECOVERABLE)
958 return(PS_TRANSIENT);
960 if (smtp_err == SM_OK)
964 switch (handle_smtp_report_without_bounce(ctl, msg))
967 force_transient_error = 1;
971 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
972 xalloca(from_responses[*bad_addresses],
974 strlen(smtp_response)+1);
975 strcpy(from_responses[*bad_addresses], smtp_response);
976 #endif /* EXPLICIT_BOUNCE_ON_BAD_ADDRESS */
979 idp->val.status.mark = XMIT_RCPTBAD;
980 if (outlevel >= O_VERBOSE)
982 GT_("%cMTP listener doesn't like recipient address `%s'\n"),
983 ctl->listener, address);
987 if (outlevel >= O_VERBOSE)
989 GT_("%cMTP listener doesn't really like recipient address `%s'\n"),
990 ctl->listener, address);
996 if (force_transient_error) {
997 /* do not risk dataloss due to overengineered multidrop
998 * crap. If one of the recipients returned PS_TRANSIENT,
999 * we return exactly that.
1001 SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
1002 return(PS_TRANSIENT);
1004 #ifdef EXPLICIT_BOUNCE_ON_BAD_ADDRESS
1006 * This should not be necessary, because the SMTP listener itself
1007 * should genrate a bounce for the bad address.
1010 send_bouncemail(ctl, msg, XMIT_RCPTBAD,
1011 "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
1012 *bad_addresses, 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.
1436 /* eat the RFC2033-required responses, saving errors */
1437 xalloca(responses, char **, 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)
1446 responses[i] = (char *)NULL;
1449 xalloca(responses[errors],
1451 strlen(smtp_response)+1);
1452 strcpy(responses[errors], smtp_response);
1458 return(TRUE); /* all deliveries succeeded */
1461 * One or more deliveries failed.
1462 * If we can bounce a failures list back to the
1463 * sender, and the postmaster does not want to
1464 * deal with the bounces return TRUE, deleting the
1465 * message from the server so it won't be
1466 * re-forwarded on subsequent poll cycles.
1468 return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
1469 "LSMTP partial delivery failure.\r\n",
1470 errors, responses));
1478 int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
1479 /* set up output sink for a mailed warning to calling user */
1484 * Dispatching warning email is a little complicated. The problem is
1485 * that we have to deal with three distinct cases:
1487 * 1. Single-drop running from user account. Warning mail should
1488 * go to the local name for which we're collecting (coincides
1489 * with calling user).
1491 * 2. Single-drop running from root or other privileged ID, with rc
1492 * file generated on the fly (Ken Estes's weird setup...) Mail
1493 * should go to the local name for which we're collecting (does not
1494 * coincide with calling user).
1496 * 3. Multidrop. Mail must go to postmaster. We leave the recipients
1497 * member null so this message will fall through to run.postmaster.
1499 * The zero in the reallen element means we won't pass a SIZE
1500 * option to ESMTP; the message length would be more trouble than
1501 * it's worth to compute.
1503 struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
1506 strcat(reply.return_path, ctl->smtpaddress ? ctl->smtpaddress :
1509 if (!MULTIDROP(ctl)) /* send to calling user */
1511 save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
1512 status = open_sink(ctl, &reply, &good, &bad);
1513 free_str_list(&reply.recipients);
1515 else /* send to postmaster */
1516 status = open_sink(ctl, &reply, &good, &bad);
1517 if (status == 0) stuff_warning(ctl, "Date: %s", rfc822timestamp());
1521 #if defined(HAVE_STDARG_H)
1522 void stuff_warning(struct query *ctl, const char *fmt, ... )
1524 void stuff_warning(struct query *ctl, fmt, va_alist)
1526 const char *fmt; /* printf-style format */
1529 /* format and ship a warning message line by mail */
1531 /* make huge -- i18n can bulk up error messages a lot */
1532 char buf[2*MSGBUFSIZE+4];
1536 * stuffline() requires its input to be writeable (for CR stripping),
1537 * so we needed to copy the message to a writeable buffer anyway in
1538 * case it was a string constant. We make a virtue of that necessity
1539 * here by supporting stdargs/varargs.
1541 #if defined(HAVE_STDARG_H)
1546 #ifdef HAVE_VSNPRINTF
1547 vsnprintf(buf, sizeof(buf), fmt, ap);
1549 vsprintf(buf, fmt, ap);
1553 #ifdef HAVE_SNPRINTF
1554 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1556 strcat(buf, "\r\n");
1557 #endif /* HAVE_SNPRINTF */
1559 /* guard against very long lines */
1560 buf[MSGBUFSIZE+1] = '\r';
1561 buf[MSGBUFSIZE+2] = '\n';
1562 buf[MSGBUFSIZE+3] = '\0';
1564 stuffline(ctl, buf);
1567 void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
1568 /* sign and send mailed warnings */
1570 stuff_warning(ctl, GT_("--\n\t\t\t\tThe Fetchmail Daemon\n"));
1571 close_sink(ctl, msg, TRUE);
1574 /* sink.c ends here */