2 * transact.c -- transaction primitives for the fetchmail driver loop
4 * Copyright 2001 by Eric S. Raymond
5 * For license terms, see the file COPYING in this directory.
13 #include <ctype.h> /* isspace() */
16 #endif /* HAVE_MEMORY_H */
17 #if defined(STDC_HEADERS)
20 #if defined(HAVE_UNISTD_H)
23 #if defined(HAVE_STDARG_H)
29 #ifdef HAVE_NET_SOCKET_H
30 #include <net/socket.h>
35 #include "fetchmail.h"
37 #ifndef strstr /* glibc-2.1 declares this as a macro */
38 extern char *strstr(); /* needed on sysV68 R3V7.1. */
41 int mytimeout; /* value of nonreponse timeout */
42 int suppress_tags; /* emit tags? */
43 char shroud[PASSWORDLEN]; /* string to shroud in debug output */
48 #define GENSYM (sprintf(tag, "A%04d", ++tagnum % TAGMOD), tag)
50 static int accept_count, reject_count;
51 static struct method *protocol;
53 static void map_name(const char *name, struct query *ctl, struct idlist **xmit_names)
54 /* add given name to xmit_names if it matches declared localnames */
55 /* name: name to map */
56 /* ctl: list of permissible aliases */
57 /* xmit_names: list of recipient names parsed out */
62 lname = idpair_find(&ctl->localnames, name+off);
63 if (!lname && ctl->wildcard)
66 if (lname != (char *)NULL)
68 if (outlevel >= O_DEBUG)
69 report(stdout, GT_("mapped %s to local %s\n"), name, lname);
70 save_str(xmit_names, lname, XMIT_ACCEPT);
75 static void find_server_names(const char *hdr,
77 struct idlist **xmit_names)
78 /* parse names out of a RFC822 header into an ID list */
79 /* hdr: RFC822 header in question */
80 /* ctl: list of permissible aliases */
81 /* xmit_names: list of recipient names parsed out */
83 if (hdr == (char *)NULL)
89 for (cp = nxtaddr(hdr);
96 * If the name of the user begins with a qmail virtual
97 * domain prefix, ignore the prefix. Doing this here
98 * means qvirtual will work either with ordinary name
99 * mapping or with a localdomains option.
101 if (ctl->server.qvirtual)
103 int sl = strlen(ctl->server.qvirtual);
105 if (!strncasecmp(cp, ctl->server.qvirtual, sl))
109 if ((atsign = strchr(cp, '@'))) {
113 * Does a trailing segment of the hostname match something
114 * on the localdomains list? If so, save the whole name
117 for (idp = ctl->server.localdomains; idp; idp = idp->next) {
120 rhs = atsign + (strlen(atsign) - strlen(idp->id));
122 (rhs[-1] == '.' || rhs[-1] == '@') &&
123 strcasecmp(rhs, idp->id) == 0)
125 if (outlevel >= O_DEBUG)
126 report(stdout, GT_("passed through %s matching %s\n"),
128 save_str(xmit_names, cp, XMIT_ACCEPT);
134 /* if we matched a local domain, idp != NULL */
138 * Check to see if the right-hand part is an alias
139 * or MX equivalent of the mailserver. If it's
140 * not, skip this name. If it is, we'll keep
141 * going and try to find a mapping to a client name.
143 if (!is_host_alias(atsign+1, ctl))
145 save_str(xmit_names, cp, XMIT_REJECT);
151 map_name(cp, ctl, xmit_names);
159 * Return zero on a syntactically invalid address, nz on a valid one.
161 * This used to be strchr(a, '.'), but it turns out that lines like this
163 * Received: from punt-1.mail.demon.net by mailstore for markb@ordern.com
164 * id 938765929:10:27223:2; Fri, 01 Oct 99 08:18:49 GMT
166 * are not uncommon. So now we just check that the following token is
167 * not itself an email address.
169 #define VALID_ADDRESS(a) !strchr(a, '@')
171 static char *parse_received(struct query *ctl, char *bufp)
172 /* try to extract real address from the Received line */
173 /* If a valid Received: line is found, we return the full address in
174 * a buffer which can be parsed from nxtaddr(). This is to ansure that
175 * the local domain part of the address can be passed along in
176 * find_server_names() if it contains one.
177 * Note: We should return a dummy header containing the address
178 * which makes nxtaddr() behave correctly.
181 char *base, *ok = (char *)NULL;
182 static char rbuf[HOSTLEN + USERNAMELEN + 4];
185 * Try to extract the real envelope addressee. We look here
186 * specifically for the mailserver's Received line.
187 * Note: this will only work for sendmail, or an MTA that
188 * shares sendmail's convention for embedding the envelope
189 * address in the Received line. Sendmail itself only
190 * does this when the mail has a single recipient.
192 if (outlevel >= O_DEBUG)
193 report(stdout, GT_("analyzing Received line:\n%s"), bufp);
195 /* search for whitepace-surrounded "by" followed by valid address */
196 for (base = bufp; ; base = ok + 2)
198 if (!(ok = strstr(base, "by")))
200 else if (!isspace(ok[-1]) || !isspace(ok[2]))
206 /* extract space-delimited token after "by" */
207 for (sp = ok + 2; isspace(*sp); sp++)
210 for (; !isspace(*sp); sp++)
214 /* look for valid address */
215 if (VALID_ADDRESS(rbuf))
218 ok = sp - 1; /* arrange to skip this token */
224 * If it's a DNS name of the mail server, look for the
225 * recipient name after a following "for". Otherwise
228 if (is_host_alias(rbuf, ctl))
230 if (outlevel >= O_DEBUG)
232 GT_("line accepted, %s is an alias of the mailserver\n"), rbuf);
236 if (outlevel >= O_DEBUG)
238 GT_("line rejected, %s is not an alias of the mailserver\n"),
243 /* search for whitepace-surrounded "for" followed by xxxx@yyyy */
244 for (base = ok + 4 + strlen(rbuf); ; base = ok + 2)
246 if (!(ok = strstr(base, "for")))
248 else if (!isspace(ok[-1]) || !isspace(ok[3]))
254 /* extract space-delimited token after "for" */
255 for (sp = ok + 3; isspace(*sp); sp++)
258 for (; !isspace(*sp); sp++)
262 if (strchr(rbuf, '@'))
265 ok = sp - 1; /* arrange to skip this token */
270 flag want_gt = FALSE;
273 /* char after "for" could be space or a continuation newline */
274 for (sp = ok + 4; isspace(*sp); sp++)
277 *tp++ = ':'; /* Here is the hack. This is to be friends */
278 *tp++ = ' '; /* with nxtaddr()... */
284 while (*sp == '@') /* skip routes */
285 while (*sp && *sp++ != ':')
288 && (want_gt ? (*sp != '>') : !isspace(*sp))
294 /* uh oh -- whitespace here can't be right! */
300 if (strlen(rbuf) <= 3) /* apparently nothing has been found */
308 if (outlevel >= O_DEBUG)
309 report(stdout, GT_("no Received address found\n"));
314 if (outlevel >= O_DEBUG) {
315 char *lf = rbuf + strlen(rbuf)-1;
317 if (outlevel >= O_DEBUG)
318 report(stdout, GT_("found Received address `%s'\n"), rbuf+2);
325 /* shared by readheaders and readbody */
326 static int sizeticker;
328 #define EMPTYLINE(s) ((s)[0] == '\r' && (s)[1] == '\n' && (s)[2] == '\0')
330 int readheaders(int sock,
335 /* read message headers and ship to SMTP or MDA */
336 /* sock: to which the server is connected */
337 /* fetchlen: length of message according to fetch response */
338 /* reallen: length of message according to getsizes */
339 /* ctl: query control record */
340 /* num: index of message */
345 struct addrblk *next;
347 struct addrblk *to_addrchain = NULL;
348 struct addrblk **to_chainptr = &to_addrchain;
349 struct addrblk *resent_to_addrchain = NULL;
350 struct addrblk **resent_to_chainptr = &resent_to_addrchain;
352 char buf[MSGBUFSIZE+1];
353 int from_offs, reply_to_offs, resent_from_offs;
354 int app_from_offs, sender_offs, resent_sender_offs;
356 char *received_for, *rcv, *cp, *delivered_to;
357 int n, linelen, oldlen, ch, remaining, skipcount;
359 flag no_local_matches = FALSE;
360 flag headers_ok, has_nuls;
361 int olderrs, good_addresses, bad_addresses;
364 has_nuls = headers_ok = FALSE;
365 msgblk.return_path[0] = '\0';
366 olderrs = ctl->errcount;
368 /* read message headers */
369 msgblk.reallen = reallen;
372 * We used to free the header block unconditionally at the end of
373 * readheaders, but it turns out that if close_sink() hits an error
374 * condition the code for sending bouncemail will actually look
375 * at the freed storage and coredump...
378 free(msgblk.headers);
380 /* initially, no message ID */
385 msgblk.headers = received_for = delivered_to = NULL;
386 from_offs = reply_to_offs = resent_from_offs = app_from_offs =
387 sender_offs = resent_sender_offs = env_offs = -1;
393 for (remaining = fetchlen; remaining > 0 || protocol->delimited; remaining -= linelen)
396 int overlong = FALSE;
398 line = xmalloc(sizeof(buf));
402 set_timeout(mytimeout);
403 if ((n = SockRead(sock, buf, sizeof(buf)-1)) == -1) {
406 free(msgblk.headers);
407 msgblk.headers = NULL;
415 * Try to gracefully handle the case, where the length of a
416 * line exceeds MSGBUFSIZE.
418 if ( n && buf[n-1] != '\n' ) {
419 unsigned int llen = strlen(line);
421 line = realloc(line, llen + n + 1);
422 strcpy(line + llen, buf);
423 ch = ' '; /* So the next iteration starts */
427 /* lines may not be properly CRLF terminated; fix this for qmail */
430 cp = buf + strlen(buf) - 1;
431 if (*cp == '\n' && (cp == buf || cp[-1] != '\r'))
440 * Decode MIME encoded headers. We MUST do this before
441 * looking at the Content-Type / Content-Transfer-Encoding
442 * headers (RFC 2046).
444 if ( ctl->mimedecode && overlong ) {
446 * If we received an overlong line, we have to decode the
447 * whole line at once.
449 line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
454 if ( ctl->mimedecode )
457 line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
461 /* check for end of headers */
465 has_nuls = (linelen != strlen(line));
467 goto process_headers;
471 * Check for end of message immediately. If one of your folders
472 * has been mangled, the delimiter may occur directly after the
475 if (protocol->delimited && line[0] == '.' && EMPTYLINE(line+1))
477 has_nuls = (linelen != strlen(line));
479 goto process_headers;
483 * At least one brain-dead website (netmind.com) is known to
484 * send out robotmail that's missing the RFC822 delimiter blank
485 * line before the body! Without this check fetchmail segfaults.
486 * With it, we treat such messages as though they had the missing
489 if (!isspace(line[0]) && !strchr(line, ':'))
492 has_nuls = (linelen != strlen(line));
494 goto process_headers;
497 /* check for RFC822 continuations */
498 set_timeout(mytimeout);
502 (ch == ' ' || ch == '\t'); /* continuation to next line? */
504 /* write the message size dots */
505 if ((outlevel > O_SILENT && outlevel < O_VERBOSE) && linelen > 0)
507 sizeticker += linelen;
508 while (sizeticker >= SIZETICKER)
510 if ((!run.use_syslog && !isafile(1)) || run.showdots)
515 sizeticker -= SIZETICKER;
519 /* we see an ordinary (non-header, non-message-delimiter line */
520 has_nuls = (linelen != strlen(line));
522 /* save the message's ID, we may use it for killing duplicates later */
523 if (MULTIDROP(ctl) && !strncasecmp(line, "Message-ID:", 11))
524 ctl->thisid = xstrdup(line);
527 * The University of Washington IMAP server (the reference
528 * implementation of IMAP4 written by Mark Crispin) relies
529 * on being able to keep base-UID information in a special
530 * message at the head of the mailbox. This message should
531 * neither be deleted nor forwarded.
535 * We disable this check under POP2 because there's no way to
536 * prevent deletion of the message. So at least we ought to
537 * forward it to the user so he or she will have some clue
538 * that things have gone awry.
541 if (strncmp(protocol->service, "pop2", 4))
542 #else /* INET6_ENABLE */
543 if (protocol->port != 109)
544 #endif /* INET6_ENABLE */
545 #endif /* POP2_ENABLE */
546 if (num == 1 && !strncasecmp(line, "X-IMAP:", 7)) {
548 free(msgblk.headers);
549 msgblk.headers = NULL;
554 * This code prevents fetchmail from becoming an accessory after
555 * the fact to upstream sendmails with the `E' option on. It also
556 * copes with certain brain-dead POP servers (like NT's) that pass
557 * through Unix from_ lines.
559 * Either of these bugs can result in a non-RFC822 line at the
560 * beginning of the headers. If fetchmail just passes it
561 * through, the client listener may think the message has *no*
562 * headers (since the first) line it sees doesn't look
563 * RFC822-conformant) and fake up a set.
565 * What the user would see in this case is bogus (synthesized)
566 * headers, followed by a blank line, followed by the >From,
567 * followed by the real headers, followed by a blank line,
570 * We forestall this lossage by tossing anything that looks
571 * like an escaped or passed-through From_ line in headers.
572 * These aren't RFC822 so our conscience is clear...
574 if (!strncasecmp(line, ">From ", 6) || !strncasecmp(line, "From ", 5))
581 * We remove all Delivered-To: headers.
583 * This is to avoid false mail loops messages when delivering
584 * local messages to and from a Postfix/qmail mailserver.
586 if (ctl->dropdelivered && !strncasecmp(line, "Delivered-To:", 13))
596 * If we see a Status line, it may have been inserted by an MUA
597 * on the mail host, or it may have been inserted by the server
598 * program after the headers in the transaction stream. This
599 * can actually hose some new-mail notifiers such as xbuffy,
600 * which assumes any Status line came from a *local* MDA and
601 * therefore indicates that the message has been seen.
603 * Some buggy POP servers (including at least the 3.3(20)
604 * version of the one distributed with IMAP) insert empty
605 * Status lines in the transaction stream; we'll chuck those
606 * unconditionally. Nonempty ones get chucked if the user
607 * turns on the dropstatus flag.
612 if (!strncasecmp(line, "Status:", 7))
614 else if (!strncasecmp(line, "X-Mozilla-Status:", 17))
619 while (*cp && isspace(*cp)) cp++;
620 if (!*cp || ctl->dropstatus)
629 line = reply_hack(line, ctl->server.truename);
632 * OK, this is messy. If we're forwarding by SMTP, it's the
633 * SMTP-receiver's job (according to RFC821, page 22, section
634 * 4.1.1) to generate a Return-Path line on final delivery.
635 * The trouble is, we've already got one because the
636 * mailserver's SMTP thought *it* was responsible for final
639 * Stash away the contents of Return-Path (as modified by reply_hack)
640 * for use in generating MAIL FROM later on, then prevent the header
641 * from being saved with the others. In effect, we strip it off here.
643 * If the SMTP server conforms to the standards, and fetchmail gets the
644 * envelope sender from the Return-Path, the new Return-Path should be
645 * exactly the same as the original one.
647 * We do *not* want to ignore empty Return-Path headers. These should
648 * be passed through as a way of indicating that a message should
649 * not trigger bounces if delivery fails. What we *do* need to do is
650 * make sure we never try to rewrite such a blank Return-Path. We
651 * handle this with a check for <> in the rewrite logic above.
653 if (!strncasecmp("Return-Path:", line, 12) && (cp = nxtaddr(line)))
655 strcpy(msgblk.return_path, cp);
664 oldlen = strlen(line);
665 msgblk.headers = xmalloc(oldlen + 1);
666 (void) strcpy(msgblk.headers, line);
668 line = msgblk.headers;
675 newlen = oldlen + strlen(line);
676 newhdrs = (char *) realloc(msgblk.headers, newlen + 1);
677 if (newhdrs == NULL) {
681 msgblk.headers = newhdrs;
682 strcpy(msgblk.headers + oldlen, line);
684 line = msgblk.headers + oldlen;
688 if (!strncasecmp("From:", line, 5))
689 from_offs = (line - msgblk.headers);
690 else if (!strncasecmp("Reply-To:", line, 9))
691 reply_to_offs = (line - msgblk.headers);
692 else if (!strncasecmp("Resent-From:", line, 12))
693 resent_from_offs = (line - msgblk.headers);
694 else if (!strncasecmp("Apparently-From:", line, 16))
695 app_from_offs = (line - msgblk.headers);
697 * Netscape 4.7 puts "Sender: zap" in mail headers. Perverse...
699 * But a literal reading of RFC822 sec. 4.4.2 supports the idea
700 * that Sender: *doesn't* have to be a working email address.
702 * The definition of the Sender header in RFC822 says, in
703 * part, "The Sender mailbox specification includes a word
704 * sequence which must correspond to a specific agent (i.e., a
705 * human user or a computer program) rather than a standard
706 * address." That implies that the contents of the Sender
707 * field don't need to be a legal email address at all So
708 * ignore any Sender or Resent-Semnder lines unless they
711 * (RFC2822 says the condents of Sender must be a valid mailbox
712 * address, which is also what RFC822 4.4.4 implies.)
714 else if (!strncasecmp("Sender:", line, 7) && (strchr(line, '@') || strchr(line, '!')))
715 sender_offs = (line - msgblk.headers);
716 else if (!strncasecmp("Resent-Sender:", line, 14) && (strchr(line, '@') || strchr(line, '!')))
717 resent_sender_offs = (line - msgblk.headers);
720 else if (!strncasecmp("Message-Id:", line, 11))
722 if (ctl->server.uidl)
726 line[IDLEN+12] = 0; /* prevent stack overflow */
727 sscanf(line+12, "%s", id);
728 if (!str_find( &ctl->newsaved, num))
730 struct idlist *new = save_str(&ctl->newsaved,id,UID_SEEN);
731 new->val.status.num = num;
735 #endif /* __UNUSED__ */
737 else if (!MULTIDROP(ctl))
740 else if (!strncasecmp("To:", line, 3)
741 || !strncasecmp("Cc:", line, 3)
742 || !strncasecmp("Bcc:", line, 4)
743 || !strncasecmp("Apparently-To:", line, 14))
745 *to_chainptr = xmalloc(sizeof(struct addrblk));
746 (*to_chainptr)->offset = (line - msgblk.headers);
747 to_chainptr = &(*to_chainptr)->next;
751 else if (!strncasecmp("Resent-To:", line, 10)
752 || !strncasecmp("Resent-Cc:", line, 10)
753 || !strncasecmp("Resent-Bcc:", line, 11))
755 *resent_to_chainptr = xmalloc(sizeof(struct addrblk));
756 (*resent_to_chainptr)->offset = (line - msgblk.headers);
757 resent_to_chainptr = &(*resent_to_chainptr)->next;
758 *resent_to_chainptr = NULL;
761 else if (ctl->server.envelope != STRING_DISABLED)
763 if (ctl->server.envelope
764 && strcasecmp(ctl->server.envelope, "Received"))
766 if (env_offs == -1 && !strncasecmp(ctl->server.envelope,
768 strlen(ctl->server.envelope)))
770 if (skipcount++ < ctl->server.envskip)
772 env_offs = (line - msgblk.headers);
775 else if (!received_for && !strncasecmp("Received:", line, 9))
777 if (skipcount++ < ctl->server.envskip)
779 received_for = parse_received(ctl, line);
786 * When mail delivered to a multidrop mailbox on the server is
787 * addressed to multiple people on the client machine, there will
788 * be one copy left in the box for each recipient. This is not a
789 * problem if we have the actual recipient address to dispatch on
790 * (e.g. because we've mined it out of sendmail trace headers, or
791 * a qmail Delivered-To line, or a declared sender envelope line).
793 * But if we're mining addressees out of the To/Cc/Bcc fields, and
794 * if the mail is addressed to N people, each recipient will
795 * get N copies. This is bad when N > 1.
797 * Foil this by suppressing all but one copy of a message with
798 * a given Message-ID. The accept_count test ensures that
799 * multiple pieces of email with the same Message-ID, each
800 * with a *single* addressee (the N == 1 case), won't be
803 * Note: This implementation only catches runs of successive
804 * messages with the same ID, but that should be good
805 * enough. A more general implementation would have to store
806 * ever-growing lists of seen message-IDs; in a long-running
807 * daemon this would turn into a memory leak even if the
808 * implementation were perfect.
810 * Don't mess with this code casually. It would be way too easy
811 * to break it in a way that blackholed mail. Better to pass
812 * the occasional duplicate than to do that...
814 if (!received_for && env_offs == -1 && !delivered_to)
816 if (ctl->lastid && ctl->thisid && !strcasecmp(ctl->lastid, ctl->thisid))
818 if (accept_count > 1)
825 ctl->lastid = ctl->thisid;
831 * We want to detect this early in case there are so few headers that the
832 * dispatch logic barfs.
836 if (outlevel > O_SILENT)
838 GT_("message delimiter found while scanning headers\n"));
842 * Hack time. If the first line of the message was blank, with no headers
843 * (this happens occasionally due to bad gatewaying software) cons up
844 * a set of fake headers.
846 * If you modify the fake header template below, be sure you don't
847 * make either From or To address @-less, otherwise the reply_hack
848 * logic will do bad things.
850 if (msgblk.headers == (char *)NULL)
853 snprintf(buf, sizeof(buf),
856 #endif /* HAVE_SNPRINTF */
857 "From: FETCHMAIL-DAEMON\r\nTo: %s@%s\r\nSubject: Headerless mail from %s's mailbox on %s\r\n",
858 user, fetchmailhost, ctl->remotename, ctl->server.truename);
859 msgblk.headers = xstrdup(buf);
863 * We can now process message headers before reading the text.
864 * In fact we have to, as this will tell us where to forward to.
867 /* Check for MIME headers indicating possible 8-bit data */
868 ctl->mimemsg = MimeBodyType(msgblk.headers, ctl->mimedecode);
871 if (ctl->server.sdps && sdps_envfrom)
873 /* We have the real envelope return-path, stored out of band by
874 * SDPS - that's more accurate than any header is going to be.
876 strcpy(msgblk.return_path, sdps_envfrom);
879 #endif /* SDPS_ENABLE */
881 * If there is a Return-Path address on the message, this was
882 * almost certainly the MAIL FROM address given the originating
883 * sendmail. This is the best thing to use for logging the
884 * message origin (it sets up the right behavior for bounces and
885 * mailing lists). Otherwise, fall down to the next available
886 * envelope address (which is the most probable real sender).
887 * *** The order is important! ***
888 * This is especially useful when receiving mailing list
889 * messages in multidrop mode. if a local address doesn't
890 * exist, the bounce message won't be returned blindly to the
891 * author or to the list itself but rather to the list manager
892 * (ex: specified by "Sender:") which is much less annoying. This
893 * is true for most mailing list packages.
895 if( !msgblk.return_path[0] ){
897 if (resent_sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_sender_offs)));
898 else if (sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + sender_offs)));
899 else if (resent_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_from_offs)));
900 else if (from_offs >= 0 && (ap = nxtaddr(msgblk.headers + from_offs)));
901 else if (reply_to_offs >= 0 && (ap = nxtaddr(msgblk.headers + reply_to_offs)));
902 else if (app_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + app_from_offs)));
903 /* multi-line MAIL FROM addresses confuse SMTP terribly */
904 if (ap && !strchr(ap, '\n'))
905 strcpy(msgblk.return_path, ap);
908 /* cons up a list of local recipients */
909 msgblk.recipients = (struct idlist *)NULL;
910 accept_count = reject_count = 0;
911 /* is this a multidrop box? */
915 if (ctl->server.sdps && sdps_envto)
917 /* We have the real envelope recipient, stored out of band by
918 * SDPS - that's more accurate than any header is going to be.
920 find_server_names(sdps_envto, ctl, &msgblk.recipients);
923 #endif /* SDPS_ENABLE */
924 if (env_offs > -1) /* We have the actual envelope addressee */
925 find_server_names(msgblk.headers + env_offs, ctl, &msgblk.recipients);
926 else if (delivered_to && ctl->server.envelope != STRING_DISABLED &&
927 ctl->server.envelope && !strcasecmp(ctl->server.envelope, "Delivered-To"))
929 find_server_names(delivered_to, ctl, &msgblk.recipients);
932 else if (received_for)
934 * We have the Received for addressee.
935 * It has to be a mailserver address, or we
936 * wouldn't have got here.
937 * We use find_server_names() to let local
938 * hostnames go through.
940 find_server_names(received_for, ctl, &msgblk.recipients);
944 * We haven't extracted the envelope address.
945 * So check all the "Resent-To" header addresses if
946 * they exist. If and only if they don't, consider
947 * the "To" addresses.
949 register struct addrblk *nextptr;
950 if (resent_to_addrchain) {
951 /* delete the "To" chain and substitute it
952 * with the "Resent-To" list
954 while (to_addrchain) {
955 nextptr = to_addrchain->next;
957 to_addrchain = nextptr;
959 to_addrchain = resent_to_addrchain;
960 resent_to_addrchain = NULL;
962 /* now look for remaining adresses */
963 while (to_addrchain) {
964 find_server_names(msgblk.headers+to_addrchain->offset, ctl, &msgblk.recipients);
965 nextptr = to_addrchain->next;
967 to_addrchain = nextptr;
972 no_local_matches = TRUE;
973 save_str(&msgblk.recipients, run.postmaster, XMIT_ACCEPT);
974 if (outlevel >= O_DEBUG)
976 GT_("no local matches, forwarding to %s\n"),
980 else /* it's a single-drop box, use first localname */
981 save_str(&msgblk.recipients, ctl->localnames->id, XMIT_ACCEPT);
985 * Time to either address the message or decide we can't deliver it yet.
987 if (ctl->errcount > olderrs) /* there were DNS errors above */
989 if (outlevel >= O_DEBUG)
991 GT_("forwarding and deletion suppressed due to DNS errors\n"));
992 free(msgblk.headers);
993 msgblk.headers = NULL;
994 free_str_list(&msgblk.recipients);
995 return(PS_TRANSIENT);
999 /* set up stuffline() so we can deliver the message body through it */
1000 if ((n = open_sink(ctl, &msgblk,
1001 &good_addresses, &bad_addresses)) != PS_SUCCESS)
1003 free(msgblk.headers);
1004 msgblk.headers = NULL;
1005 free_str_list(&msgblk.recipients);
1012 * Some server/sendmail combinations cause problems when our
1013 * synthetic Received line is before the From header. Cope
1016 if ((rcv = strstr(msgblk.headers, "Received:")) == (char *)NULL)
1017 rcv = msgblk.headers;
1018 /* handle ">Received:" lines too */
1019 while (rcv > msgblk.headers && rcv[-1] != '\n')
1021 if (rcv > msgblk.headers)
1026 n = stuffline(ctl, msgblk.headers);
1029 if (!run.invisible && n != -1)
1031 /* utter any per-message Received information we need here */
1032 if (ctl->server.trueaddr) {
1033 #ifdef HAVE_SNPRINTF
1034 snprintf(buf, sizeof(buf),
1037 #endif /* HAVE_SNPRINTF */
1038 "Received: from %s [%u.%u.%u.%u]\r\n",
1039 ctl->server.truename,
1040 (unsigned char)ctl->server.trueaddr[0],
1041 (unsigned char)ctl->server.trueaddr[1],
1042 (unsigned char)ctl->server.trueaddr[2],
1043 (unsigned char)ctl->server.trueaddr[3]);
1045 #ifdef HAVE_SNPRINTF
1046 snprintf(buf, sizeof(buf),
1049 #endif /* HAVE_SNPRINTF */
1050 "Received: from %s\r\n", ctl->server.truename);
1052 n = stuffline(ctl, buf);
1056 * This header is technically invalid under RFC822.
1057 * POP3, IMAP, etc. are not legal mail-parameter values.
1059 #ifdef HAVE_SNPRINTF
1060 snprintf(buf, sizeof(buf),
1063 #endif /* HAVE_SNPRINTF */
1064 "\tby %s with %s (fetchmail-%s",
1068 if (ctl->tracepolls)
1070 sprintf(buf + strlen(buf), " polling %s account %s",
1071 ctl->server.pollname,
1074 #ifdef HAVE_SNPRINTF
1075 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), ")\r\n");
1077 strcat(buf, ")\r\n");
1078 #endif /* HAVE_SNPRINTF */
1079 n = stuffline(ctl, buf);
1083 if (good_addresses == 0)
1085 #ifdef HAVE_SNPRINTF
1086 snprintf(buf+1, sizeof(buf)-1,
1089 #endif /* HAVE_SNPRINTF */
1090 "for %s@%s (by default); ",
1091 user, ctl->destaddr);
1093 else if (good_addresses == 1)
1095 for (idp = msgblk.recipients; idp; idp = idp->next)
1096 if (idp->val.status.mark == XMIT_ACCEPT)
1097 break; /* only report first address */
1098 if (strchr(idp->id, '@'))
1099 #ifdef HAVE_SNPRINTF
1100 snprintf(buf+1, sizeof(buf)-1,
1103 #endif /* HAVE_SNPRINTF */
1107 * This could be a bit misleading, as destaddr is
1108 * the forwarding host rather than the actual
1109 * destination. Most of the time they coincide.
1111 #ifdef HAVE_SNPRINTF
1112 snprintf(buf+1, sizeof(buf)-1,
1115 #endif /* HAVE_SNPRINTF */
1116 "for %s@%s", idp->id, ctl->destaddr);
1117 sprintf(buf+strlen(buf), " (%s); ",
1118 MULTIDROP(ctl) ? "multi-drop" : "single-drop");
1123 #ifdef HAVE_SNPRINTF
1124 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "%s\r\n",
1127 strcat(buf, rfc822timestamp());
1128 strcat(buf, "\r\n");
1129 #endif /* HAVE_SNPRINTF */
1130 n = stuffline(ctl, buf);
1136 n = stuffline(ctl, rcv); /* ship out rest of msgblk.headers */
1140 report(stdout, GT_("writing RFC822 msgblk.headers\n"));
1142 free(msgblk.headers);
1143 msgblk.headers = NULL;
1144 free_str_list(&msgblk.recipients);
1147 else if ((run.poll_interval == 0 || nodetach) && outlevel >= O_VERBOSE && !isafile(2))
1150 /* write error notifications */
1151 if (no_local_matches || has_nuls || bad_addresses)
1154 char errhd[USERNAMELEN + POPBUFSIZE], *errmsg;
1157 (void) strcpy(errhd, "X-Fetchmail-Warning: ");
1158 if (no_local_matches)
1160 if (reject_count != 1)
1161 strcat(errhd, GT_("no recipient addresses matched declared local names"));
1164 for (idp = msgblk.recipients; idp; idp = idp->next)
1165 if (idp->val.status.mark == XMIT_REJECT)
1167 sprintf(errhd+strlen(errhd), GT_("recipient address %s didn't match any local name"), idp->id);
1173 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1174 strcat(errhd, "; ");
1175 strcat(errhd, GT_("message has embedded NULs"));
1180 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1181 strcat(errhd, "; ");
1182 strcat(errhd, GT_("SMTP listener rejected local recipient addresses: "));
1183 errlen = strlen(errhd);
1184 for (idp = msgblk.recipients; idp; idp = idp->next)
1185 if (idp->val.status.mark == XMIT_RCPTBAD)
1186 errlen += strlen(idp->id) + 2;
1188 xalloca(errmsg, char *, errlen+3);
1189 (void) strcpy(errmsg, errhd);
1190 for (idp = msgblk.recipients; idp; idp = idp->next)
1191 if (idp->val.status.mark == XMIT_RCPTBAD)
1193 strcat(errmsg, idp->id);
1195 strcat(errmsg, ", ");
1200 strcat(errmsg, "\r\n");
1202 /* ship out the error line */
1203 stuffline(ctl, errmsg);
1206 /* issue the delimiter line */
1211 stuffline(ctl, buf);
1213 /* free(msgblk.headers); */
1214 free_str_list(&msgblk.recipients);
1215 return(headers_ok ? PS_SUCCESS : PS_TRUNCATED);
1218 int readbody(int sock, struct query *ctl, flag forward, int len)
1219 /* read and dispose of a message body presented on sock */
1220 /* ctl: query control record */
1221 /* sock: to which the server is connected */
1222 /* len: length of message */
1223 /* forward: TRUE to forward */
1226 unsigned char buf[MSGBUFSIZE+4];
1227 unsigned char *inbufp = buf;
1228 flag issoftline = FALSE;
1231 * Pass through the text lines in the body.
1233 * Yes, this wants to be ||, not &&. The problem is that in the most
1234 * important delimited protocol, POP3, the length is not reliable.
1235 * As usual, the problem is Microsoft brain damage; see FAQ item S2.
1236 * So, for delimited protocols we need to ignore the length here and
1237 * instead drop out of the loop with a break statement when we see
1238 * the message delimiter.
1240 while (protocol->delimited || len > 0)
1242 set_timeout(mytimeout);
1243 if ((linelen = SockRead(sock, inbufp, sizeof(buf)-4-(inbufp-buf)))==-1)
1251 /* write the message size dots */
1254 sizeticker += linelen;
1255 while (sizeticker >= SIZETICKER)
1257 if (outlevel > O_SILENT && (((run.poll_interval == 0 || nodetach) && !isafile(1)) || run.showdots))
1262 sizeticker -= SIZETICKER;
1267 /* check for end of message */
1268 if (protocol->delimited && *inbufp == '.')
1270 if (inbufp[1] == '\r' && inbufp[2] == '\n' && inbufp[3] == '\0')
1272 else if (inbufp[1] == '\n' && inbufp[2] == '\0')
1275 msgblk.msglen--; /* subtract the size of the dot escape */
1278 msgblk.msglen += linelen;
1280 if (ctl->mimedecode && (ctl->mimemsg & MSG_NEEDS_DECODE)) {
1281 issoftline = UnMimeBodyline(&inbufp, protocol->delimited, issoftline);
1282 if (issoftline && (sizeof(buf)-1-(inbufp-buf) < 200))
1285 * Soft linebreak, but less than 200 bytes left in
1286 * input buffer. Rather than doing a buffer overrun,
1287 * ignore the soft linebreak, NL-terminate data and
1288 * deliver what we have now.
1289 * (Who writes lines longer than 2K anyway?)
1291 *inbufp = '\n'; *(inbufp+1) = '\0';
1296 /* ship out the text line */
1297 if (forward && (!issoftline))
1302 /* guard against very long lines */
1303 buf[MSGBUFSIZE+1] = '\r';
1304 buf[MSGBUFSIZE+2] = '\n';
1305 buf[MSGBUFSIZE+3] = '\0';
1307 n = stuffline(ctl, buf);
1311 report(stdout, GT_("writing message text\n"));
1315 else if (outlevel >= O_VERBOSE && !isafile(1))
1326 void init_transact(const struct method *proto)
1327 /* initialize state for the send and receive functions */
1330 tag[0] = '\0'; /* nuke any tag hanging out from previous query */
1331 protocol = (struct method *)proto;
1334 #if defined(HAVE_STDARG_H)
1335 void gen_send(int sock, const char *fmt, ... )
1337 void gen_send(sock, fmt, va_alist)
1338 int sock; /* socket to which server is connected */
1339 const char *fmt; /* printf-style format */
1342 /* assemble command in printf(3) style and send to the server */
1344 char buf [MSGBUFSIZE+1];
1347 if (protocol->tagged && !suppress_tags)
1348 (void) sprintf(buf, "%s ", GENSYM);
1352 #if defined(HAVE_STDARG_H)
1357 #ifdef HAVE_VSNPRINTF
1358 vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap);
1360 vsprintf(buf + strlen(buf), fmt, ap);
1364 #ifdef HAVE_SNPRINTF
1365 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1367 strcat(buf, "\r\n");
1368 #endif /* HAVE_SNPRINTF */
1369 SockWrite(sock, buf, strlen(buf));
1371 if (outlevel >= O_MONITOR)
1375 if (shroud[0] && (cp = strstr(buf, shroud)))
1379 sp = cp + strlen(shroud);
1385 buf[strlen(buf)-2] = '\0';
1386 report(stdout, "%s> %s\n", protocol->name, buf);
1390 int gen_recv(sock, buf, size)
1391 /* get one line of input from the server */
1392 int sock; /* socket to which server is connected */
1393 char *buf; /* buffer to receive input */
1394 int size; /* length of buffer */
1396 int oldphase = phase; /* we don't have to be re-entrant */
1398 phase = SERVER_WAIT;
1399 set_timeout(mytimeout);
1400 if (SockRead(sock, buf, size) == -1)
1409 if (buf[strlen(buf)-1] == '\n')
1410 buf[strlen(buf)-1] = '\0';
1411 if (buf[strlen(buf)-1] == '\r')
1412 buf[strlen(buf)-1] = '\0';
1413 if (outlevel >= O_MONITOR)
1414 report(stdout, "%s< %s\n", protocol->name, buf);
1420 #if defined(HAVE_STDARG_H)
1421 int gen_transact(int sock, const char *fmt, ... )
1423 int gen_transact(int sock, fmt, va_alist)
1424 int sock; /* socket to which server is connected */
1425 const char *fmt; /* printf-style format */
1428 /* assemble command in printf(3) style, send to server, accept a response */
1431 char buf [MSGBUFSIZE+1];
1433 int oldphase = phase; /* we don't have to be re-entrant */
1435 phase = SERVER_WAIT;
1437 if (protocol->tagged && !suppress_tags)
1438 (void) sprintf(buf, "%s ", GENSYM);
1442 #if defined(HAVE_STDARG_H)
1447 #ifdef HAVE_VSNPRINTF
1448 vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap);
1450 vsprintf(buf + strlen(buf), fmt, ap);
1454 #ifdef HAVE_SNPRINTF
1455 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1457 strcat(buf, "\r\n");
1458 #endif /* HAVE_SNPRINTF */
1459 SockWrite(sock, buf, strlen(buf));
1461 if (outlevel >= O_MONITOR)
1465 if (shroud && shroud[0] && (cp = strstr(buf, shroud)))
1469 sp = cp + strlen(shroud);
1475 buf[strlen(buf)-1] = '\0';
1476 report(stdout, "%s> %s\n", protocol->name, buf);
1479 /* we presume this does its own response echoing */
1480 ok = (protocol->parse_response)(sock, buf);
1486 /* transact.c ends here */