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*2+1]; /* 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 * Handle empty address from a To: header containing only
103 * If the name of the user begins with a qmail virtual
104 * domain prefix, ignore the prefix. Doing this here
105 * means qvirtual will work either with ordinary name
106 * mapping or with a localdomains option.
108 if (ctl->server.qvirtual)
110 int sl = strlen(ctl->server.qvirtual);
112 if (!strncasecmp(cp, ctl->server.qvirtual, sl))
116 if ((atsign = strchr(cp, '@'))) {
120 * Does a trailing segment of the hostname match something
121 * on the localdomains list? If so, save the whole name
124 for (idp = ctl->server.localdomains; idp; idp = idp->next) {
127 rhs = atsign + (strlen(atsign) - strlen(idp->id));
129 (rhs[-1] == '.' || rhs[-1] == '@') &&
130 strcasecmp(rhs, idp->id) == 0)
132 if (outlevel >= O_DEBUG)
133 report(stdout, GT_("passed through %s matching %s\n"),
135 save_str(xmit_names, cp, XMIT_ACCEPT);
141 /* if we matched a local domain, idp != NULL */
145 * Check to see if the right-hand part is an alias
146 * or MX equivalent of the mailserver. If it's
147 * not, skip this name. If it is, we'll keep
148 * going and try to find a mapping to a client name.
150 if (!is_host_alias(atsign+1, ctl))
152 save_str(xmit_names, cp, XMIT_REJECT);
158 map_name(cp, ctl, xmit_names);
166 * Return zero on a syntactically invalid address, nz on a valid one.
168 * This used to be strchr(a, '.'), but it turns out that lines like this
170 * Received: from punt-1.mail.demon.net by mailstore for markb@ordern.com
171 * id 938765929:10:27223:2; Fri, 01 Oct 99 08:18:49 GMT
173 * are not uncommon. So now we just check that the following token is
174 * not itself an email address.
176 #define VALID_ADDRESS(a) !strchr(a, '@')
178 static char *parse_received(struct query *ctl, char *bufp)
179 /* try to extract real address from the Received line */
180 /* If a valid Received: line is found, we return the full address in
181 * a buffer which can be parsed from nxtaddr(). This is to ansure that
182 * the local domain part of the address can be passed along in
183 * find_server_names() if it contains one.
184 * Note: We should return a dummy header containing the address
185 * which makes nxtaddr() behave correctly.
188 char *base, *ok = (char *)NULL;
189 static char rbuf[HOSTLEN + USERNAMELEN + 4];
192 * Try to extract the real envelope addressee. We look here
193 * specifically for the mailserver's Received line.
194 * Note: this will only work for sendmail, or an MTA that
195 * shares sendmail's convention for embedding the envelope
196 * address in the Received line. Sendmail itself only
197 * does this when the mail has a single recipient.
199 if (outlevel >= O_DEBUG)
200 report(stdout, GT_("analyzing Received line:\n%s"), bufp);
202 /* search for whitepace-surrounded "by" followed by valid address */
203 for (base = bufp; ; base = ok + 2)
205 if (!(ok = strstr(base, "by")))
207 else if (!isspace(ok[-1]) || !isspace(ok[2]))
213 /* extract space-delimited token after "by" */
214 for (sp = ok + 2; isspace(*sp); sp++)
217 for (; !isspace(*sp); sp++)
221 /* look for valid address */
222 if (VALID_ADDRESS(rbuf))
225 ok = sp - 1; /* arrange to skip this token */
231 * If it's a DNS name of the mail server, look for the
232 * recipient name after a following "for". Otherwise
235 if (is_host_alias(rbuf, ctl))
237 if (outlevel >= O_DEBUG)
239 GT_("line accepted, %s is an alias of the mailserver\n"), rbuf);
243 if (outlevel >= O_DEBUG)
245 GT_("line rejected, %s is not an alias of the mailserver\n"),
250 /* search for whitepace-surrounded "for" followed by xxxx@yyyy */
251 for (base = ok + 4 + strlen(rbuf); ; base = ok + 2)
253 if (!(ok = strstr(base, "for")))
255 else if (!isspace(ok[-1]) || !isspace(ok[3]))
261 /* extract space-delimited token after "for" */
262 for (sp = ok + 3; isspace(*sp); sp++)
265 for (; !isspace(*sp); sp++)
269 if (strchr(rbuf, '@'))
272 ok = sp - 1; /* arrange to skip this token */
277 flag want_gt = FALSE;
280 /* char after "for" could be space or a continuation newline */
281 for (sp = ok + 4; isspace(*sp); sp++)
284 *tp++ = ':'; /* Here is the hack. This is to be friends */
285 *tp++ = ' '; /* with nxtaddr()... */
291 while (*sp == '@') /* skip routes */
292 while (*sp && *sp++ != ':')
295 && (want_gt ? (*sp != '>') : !isspace(*sp))
301 /* uh oh -- whitespace here can't be right! */
307 if (strlen(rbuf) <= 3) /* apparently nothing has been found */
315 if (outlevel >= O_DEBUG)
316 report(stdout, GT_("no Received address found\n"));
321 if (outlevel >= O_DEBUG) {
322 char *lf = rbuf + strlen(rbuf)-1;
324 if (outlevel >= O_DEBUG)
325 report(stdout, GT_("found Received address `%s'\n"), rbuf+2);
332 /* shared by readheaders and readbody */
333 static int sizeticker;
335 #define EMPTYLINE(s) ((s)[0] == '\r' && (s)[1] == '\n' && (s)[2] == '\0')
337 int readheaders(int sock,
342 /* read message headers and ship to SMTP or MDA */
343 /* sock: to which the server is connected */
344 /* fetchlen: length of message according to fetch response */
345 /* reallen: length of message according to getsizes */
346 /* ctl: query control record */
347 /* num: index of message */
352 struct addrblk *next;
354 struct addrblk *to_addrchain = NULL;
355 struct addrblk **to_chainptr = &to_addrchain;
356 struct addrblk *resent_to_addrchain = NULL;
357 struct addrblk **resent_to_chainptr = &resent_to_addrchain;
359 char buf[MSGBUFSIZE+1];
360 int from_offs, reply_to_offs, resent_from_offs;
361 int app_from_offs, sender_offs, resent_sender_offs;
363 char *received_for, *rcv, *cp, *delivered_to;
364 int n, linelen, oldlen, ch, remaining, skipcount;
366 flag no_local_matches = FALSE;
367 flag headers_ok, has_nuls;
368 int olderrs, good_addresses, bad_addresses;
371 has_nuls = headers_ok = FALSE;
372 msgblk.return_path[0] = '\0';
373 olderrs = ctl->errcount;
375 /* read message headers */
376 msgblk.reallen = reallen;
379 * We used to free the header block unconditionally at the end of
380 * readheaders, but it turns out that if close_sink() hits an error
381 * condition the code for sending bouncemail will actually look
382 * at the freed storage and coredump...
385 free(msgblk.headers);
387 /* initially, no message ID */
392 msgblk.headers = received_for = delivered_to = NULL;
393 from_offs = reply_to_offs = resent_from_offs = app_from_offs =
394 sender_offs = resent_sender_offs = env_offs = -1;
400 for (remaining = fetchlen; remaining > 0 || protocol->delimited; remaining -= linelen)
403 int overlong = FALSE;
405 line = xmalloc(sizeof(buf));
409 set_timeout(mytimeout);
410 if ((n = SockRead(sock, buf, sizeof(buf)-1)) == -1) {
413 free(msgblk.headers);
414 msgblk.headers = NULL;
422 * Try to gracefully handle the case, where the length of a
423 * line exceeds MSGBUFSIZE.
425 if ( n && buf[n-1] != '\n' ) {
426 unsigned int llen = strlen(line);
428 line = realloc(line, llen + n + 1);
429 strcpy(line + llen, buf);
430 ch = ' '; /* So the next iteration starts */
434 /* lines may not be properly CRLF terminated; fix this for qmail */
437 cp = buf + strlen(buf) - 1;
438 if (*cp == '\n' && (cp == buf || cp[-1] != '\r'))
447 * Decode MIME encoded headers. We MUST do this before
448 * looking at the Content-Type / Content-Transfer-Encoding
449 * headers (RFC 2046).
451 if ( ctl->mimedecode && overlong ) {
453 * If we received an overlong line, we have to decode the
454 * whole line at once.
456 line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
461 if ( ctl->mimedecode )
464 line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
468 /* check for end of headers */
472 has_nuls = (linelen != strlen(line));
474 goto process_headers;
478 * Check for end of message immediately. If one of your folders
479 * has been mangled, the delimiter may occur directly after the
482 if (protocol->delimited && line[0] == '.' && EMPTYLINE(line+1))
485 has_nuls = (linelen != strlen(line));
487 goto process_headers;
491 * At least one brain-dead website (netmind.com) is known to
492 * send out robotmail that's missing the RFC822 delimiter blank
493 * line before the body! Without this check fetchmail segfaults.
494 * With it, we treat such messages as though they had the missing
497 if (!isspace(line[0]) && !strchr(line, ':'))
500 has_nuls = (linelen != strlen(line));
502 goto process_headers;
505 /* check for RFC822 continuations */
506 set_timeout(mytimeout);
510 (ch == ' ' || ch == '\t'); /* continuation to next line? */
512 /* write the message size dots */
513 if ((outlevel > O_SILENT && outlevel < O_VERBOSE) && linelen > 0)
515 sizeticker += linelen;
516 while (sizeticker >= SIZETICKER)
518 if ((!run.use_syslog && !isafile(1)) || run.showdots)
523 sizeticker -= SIZETICKER;
527 /* we see an ordinary (non-header, non-message-delimiter line */
528 has_nuls = (linelen != strlen(line));
530 /* save the message's ID, we may use it for killing duplicates later */
531 if (MULTIDROP(ctl) && !strncasecmp(line, "Message-ID:", 11))
532 ctl->thisid = xstrdup(line);
535 * The University of Washington IMAP server (the reference
536 * implementation of IMAP4 written by Mark Crispin) relies
537 * on being able to keep base-UID information in a special
538 * message at the head of the mailbox. This message should
539 * neither be deleted nor forwarded.
543 * We disable this check under POP2 because there's no way to
544 * prevent deletion of the message. So at least we ought to
545 * forward it to the user so he or she will have some clue
546 * that things have gone awry.
549 if (strncmp(protocol->service, "pop2", 4))
550 #else /* INET6_ENABLE */
551 if (protocol->port != 109)
552 #endif /* INET6_ENABLE */
553 #endif /* POP2_ENABLE */
554 if (num == 1 && !strncasecmp(line, "X-IMAP:", 7)) {
556 free(msgblk.headers);
557 msgblk.headers = NULL;
562 * This code prevents fetchmail from becoming an accessory after
563 * the fact to upstream sendmails with the `E' option on. It also
564 * copes with certain brain-dead POP servers (like NT's) that pass
565 * through Unix from_ lines.
567 * Either of these bugs can result in a non-RFC822 line at the
568 * beginning of the headers. If fetchmail just passes it
569 * through, the client listener may think the message has *no*
570 * headers (since the first) line it sees doesn't look
571 * RFC822-conformant) and fake up a set.
573 * What the user would see in this case is bogus (synthesized)
574 * headers, followed by a blank line, followed by the >From,
575 * followed by the real headers, followed by a blank line,
578 * We forestall this lossage by tossing anything that looks
579 * like an escaped or passed-through From_ line in headers.
580 * These aren't RFC822 so our conscience is clear...
582 if (!strncasecmp(line, ">From ", 6) || !strncasecmp(line, "From ", 5))
589 * We remove all Delivered-To: headers.
591 * This is to avoid false mail loops messages when delivering
592 * local messages to and from a Postfix/qmail mailserver.
594 if (ctl->dropdelivered && !strncasecmp(line, "Delivered-To:", 13))
604 * If we see a Status line, it may have been inserted by an MUA
605 * on the mail host, or it may have been inserted by the server
606 * program after the headers in the transaction stream. This
607 * can actually hose some new-mail notifiers such as xbuffy,
608 * which assumes any Status line came from a *local* MDA and
609 * therefore indicates that the message has been seen.
611 * Some buggy POP servers (including at least the 3.3(20)
612 * version of the one distributed with IMAP) insert empty
613 * Status lines in the transaction stream; we'll chuck those
614 * unconditionally. Nonempty ones get chucked if the user
615 * turns on the dropstatus flag.
620 if (!strncasecmp(line, "Status:", 7))
622 else if (!strncasecmp(line, "X-Mozilla-Status:", 17))
627 while (*cp && isspace(*cp)) cp++;
628 if (!*cp || ctl->dropstatus)
637 line = reply_hack(line, ctl->server.truename);
640 * OK, this is messy. If we're forwarding by SMTP, it's the
641 * SMTP-receiver's job (according to RFC821, page 22, section
642 * 4.1.1) to generate a Return-Path line on final delivery.
643 * The trouble is, we've already got one because the
644 * mailserver's SMTP thought *it* was responsible for final
647 * Stash away the contents of Return-Path (as modified by reply_hack)
648 * for use in generating MAIL FROM later on, then prevent the header
649 * from being saved with the others. In effect, we strip it off here.
651 * If the SMTP server conforms to the standards, and fetchmail gets the
652 * envelope sender from the Return-Path, the new Return-Path should be
653 * exactly the same as the original one.
655 * We do *not* want to ignore empty Return-Path headers. These should
656 * be passed through as a way of indicating that a message should
657 * not trigger bounces if delivery fails. What we *do* need to do is
658 * make sure we never try to rewrite such a blank Return-Path. We
659 * handle this with a check for <> in the rewrite logic above.
661 if (!strncasecmp("Return-Path:", line, 12) && (cp = nxtaddr(line)))
663 strcpy(msgblk.return_path, cp);
672 oldlen = strlen(line);
673 msgblk.headers = xmalloc(oldlen + 1);
674 (void) strcpy(msgblk.headers, line);
676 line = msgblk.headers;
683 newlen = oldlen + strlen(line);
684 newhdrs = (char *) realloc(msgblk.headers, newlen + 1);
685 if (newhdrs == NULL) {
689 msgblk.headers = newhdrs;
690 strcpy(msgblk.headers + oldlen, line);
692 line = msgblk.headers + oldlen;
696 /* find offsets of various special headers */
697 if (!strncasecmp("From:", line, 5))
698 from_offs = (line - msgblk.headers);
699 else if (!strncasecmp("Reply-To:", line, 9))
700 reply_to_offs = (line - msgblk.headers);
701 else if (!strncasecmp("Resent-From:", line, 12))
702 resent_from_offs = (line - msgblk.headers);
703 else if (!strncasecmp("Apparently-From:", line, 16))
704 app_from_offs = (line - msgblk.headers);
706 * Netscape 4.7 puts "Sender: zap" in mail headers. Perverse...
708 * But a literal reading of RFC822 sec. 4.4.2 supports the idea
709 * that Sender: *doesn't* have to be a working email address.
711 * The definition of the Sender header in RFC822 says, in
712 * part, "The Sender mailbox specification includes a word
713 * sequence which must correspond to a specific agent (i.e., a
714 * human user or a computer program) rather than a standard
715 * address." That implies that the contents of the Sender
716 * field don't need to be a legal email address at all So
717 * ignore any Sender or Resent-Semnder lines unless they
720 * (RFC2822 says the condents of Sender must be a valid mailbox
721 * address, which is also what RFC822 4.4.4 implies.)
723 else if (!strncasecmp("Sender:", line, 7) && (strchr(line, '@') || strchr(line, '!')))
724 sender_offs = (line - msgblk.headers);
725 else if (!strncasecmp("Resent-Sender:", line, 14) && (strchr(line, '@') || strchr(line, '!')))
726 resent_sender_offs = (line - msgblk.headers);
729 else if (!strncasecmp("Message-Id:", line, 11))
731 if (ctl->server.uidl)
735 line[IDLEN+12] = 0; /* prevent stack overflow */
736 sscanf(line+12, "%s", id);
737 if (!str_find( &ctl->newsaved, num))
739 struct idlist *new = save_str(&ctl->newsaved,id,UID_SEEN);
740 new->val.status.num = num;
744 #endif /* __UNUSED__ */
746 /* if multidrop is on, gather addressee headers */
749 if (!strncasecmp("To:", line, 3)
750 || !strncasecmp("Cc:", line, 3)
751 || !strncasecmp("Bcc:", line, 4)
752 || !strncasecmp("Apparently-To:", line, 14))
754 *to_chainptr = xmalloc(sizeof(struct addrblk));
755 (*to_chainptr)->offset = (line - msgblk.headers);
756 to_chainptr = &(*to_chainptr)->next;
760 else if (!strncasecmp("Resent-To:", line, 10)
761 || !strncasecmp("Resent-Cc:", line, 10)
762 || !strncasecmp("Resent-Bcc:", line, 11))
764 *resent_to_chainptr = xmalloc(sizeof(struct addrblk));
765 (*resent_to_chainptr)->offset = (line - msgblk.headers);
766 resent_to_chainptr = &(*resent_to_chainptr)->next;
767 *resent_to_chainptr = NULL;
770 else if (ctl->server.envelope != STRING_DISABLED)
772 if (ctl->server.envelope
773 && strcasecmp(ctl->server.envelope, "Received"))
775 if (env_offs == -1 && !strncasecmp(ctl->server.envelope,
777 strlen(ctl->server.envelope)))
779 if (skipcount++ < ctl->server.envskip)
781 env_offs = (line - msgblk.headers);
784 else if (!received_for && !strncasecmp("Received:", line, 9))
786 if (skipcount++ < ctl->server.envskip)
788 received_for = parse_received(ctl, line);
796 * When mail delivered to a multidrop mailbox on the server is
797 * addressed to multiple people on the client machine, there will
798 * be one copy left in the box for each recipient. This is not a
799 * problem if we have the actual recipient address to dispatch on
800 * (e.g. because we've mined it out of sendmail trace headers, or
801 * a qmail Delivered-To line, or a declared sender envelope line).
803 * But if we're mining addressees out of the To/Cc/Bcc fields, and
804 * if the mail is addressed to N people, each recipient will
805 * get N copies. This is bad when N > 1.
807 * Foil this by suppressing all but one copy of a message with
808 * a given Message-ID. The accept_count test ensures that
809 * multiple pieces of email with the same Message-ID, each
810 * with a *single* addressee (the N == 1 case), won't be
813 * Note: This implementation only catches runs of successive
814 * messages with the same ID, but that should be good
815 * enough. A more general implementation would have to store
816 * ever-growing lists of seen message-IDs; in a long-running
817 * daemon this would turn into a memory leak even if the
818 * implementation were perfect.
820 * Don't mess with this code casually. It would be way too easy
821 * to break it in a way that blackholed mail. Better to pass
822 * the occasional duplicate than to do that...
824 if (!received_for && env_offs == -1 && !delivered_to)
826 if (ctl->lastid && ctl->thisid && !strcasecmp(ctl->lastid, ctl->thisid))
828 if (accept_count > 1)
835 ctl->lastid = ctl->thisid;
841 * We want to detect this early in case there are so few headers that the
842 * dispatch logic barfs.
846 if (outlevel > O_SILENT)
848 GT_("message delimiter found while scanning headers\n"));
852 * Hack time. If the first line of the message was blank, with no headers
853 * (this happens occasionally due to bad gatewaying software) cons up
854 * a set of fake headers.
856 * If you modify the fake header template below, be sure you don't
857 * make either From or To address @-less, otherwise the reply_hack
858 * logic will do bad things.
860 if (msgblk.headers == (char *)NULL)
863 snprintf(buf, sizeof(buf),
866 #endif /* HAVE_SNPRINTF */
867 "From: FETCHMAIL-DAEMON\r\nTo: %s@%s\r\nSubject: Headerless mail from %s's mailbox on %s\r\n",
868 user, fetchmailhost, ctl->remotename, ctl->server.truename);
869 msgblk.headers = xstrdup(buf);
873 * We can now process message headers before reading the text.
874 * In fact we have to, as this will tell us where to forward to.
877 /* Check for MIME headers indicating possible 8-bit data */
878 ctl->mimemsg = MimeBodyType(msgblk.headers, ctl->mimedecode);
881 if (ctl->server.sdps && sdps_envfrom)
883 /* We have the real envelope return-path, stored out of band by
884 * SDPS - that's more accurate than any header is going to be.
886 strcpy(msgblk.return_path, sdps_envfrom);
889 #endif /* SDPS_ENABLE */
891 * If there is a Return-Path address on the message, this was
892 * almost certainly the MAIL FROM address given the originating
893 * sendmail. This is the best thing to use for logging the
894 * message origin (it sets up the right behavior for bounces and
895 * mailing lists). Otherwise, fall down to the next available
896 * envelope address (which is the most probable real sender).
897 * *** The order is important! ***
898 * This is especially useful when receiving mailing list
899 * messages in multidrop mode. if a local address doesn't
900 * exist, the bounce message won't be returned blindly to the
901 * author or to the list itself but rather to the list manager
902 * (ex: specified by "Sender:") which is much less annoying. This
903 * is true for most mailing list packages.
905 if( !msgblk.return_path[0] ){
907 if (resent_sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_sender_offs)));
908 else if (sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + sender_offs)));
909 else if (resent_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_from_offs)));
910 else if (from_offs >= 0 && (ap = nxtaddr(msgblk.headers + from_offs)));
911 else if (reply_to_offs >= 0 && (ap = nxtaddr(msgblk.headers + reply_to_offs)));
912 else if (app_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + app_from_offs)));
913 /* multi-line MAIL FROM addresses confuse SMTP terribly */
914 if (ap && !strchr(ap, '\n'))
915 strcpy(msgblk.return_path, ap);
918 /* cons up a list of local recipients */
919 msgblk.recipients = (struct idlist *)NULL;
920 accept_count = reject_count = 0;
921 /* is this a multidrop box? */
925 if (ctl->server.sdps && sdps_envto)
927 /* We have the real envelope recipient, stored out of band by
928 * SDPS - that's more accurate than any header is going to be.
930 find_server_names(sdps_envto, ctl, &msgblk.recipients);
933 #endif /* SDPS_ENABLE */
934 if (env_offs > -1) /* We have the actual envelope addressee */
935 find_server_names(msgblk.headers + env_offs, ctl, &msgblk.recipients);
936 else if (delivered_to && ctl->server.envelope != STRING_DISABLED &&
937 ctl->server.envelope && !strcasecmp(ctl->server.envelope, "Delivered-To"))
939 find_server_names(delivered_to, ctl, &msgblk.recipients);
942 else if (received_for)
944 * We have the Received for addressee.
945 * It has to be a mailserver address, or we
946 * wouldn't have got here.
947 * We use find_server_names() to let local
948 * hostnames go through.
950 find_server_names(received_for, ctl, &msgblk.recipients);
954 * We haven't extracted the envelope address.
955 * So check all the "Resent-To" header addresses if
956 * they exist. If and only if they don't, consider
957 * the "To" addresses.
959 register struct addrblk *nextptr;
960 if (resent_to_addrchain) {
961 /* delete the "To" chain and substitute it
962 * with the "Resent-To" list
964 while (to_addrchain) {
965 nextptr = to_addrchain->next;
967 to_addrchain = nextptr;
969 to_addrchain = resent_to_addrchain;
970 resent_to_addrchain = NULL;
972 /* now look for remaining adresses */
973 while (to_addrchain) {
974 find_server_names(msgblk.headers+to_addrchain->offset, ctl, &msgblk.recipients);
975 nextptr = to_addrchain->next;
977 to_addrchain = nextptr;
982 no_local_matches = TRUE;
983 save_str(&msgblk.recipients, run.postmaster, XMIT_ACCEPT);
984 if (outlevel >= O_DEBUG)
986 GT_("no local matches, forwarding to %s\n"),
990 else /* it's a single-drop box, use first localname */
991 save_str(&msgblk.recipients, ctl->localnames->id, XMIT_ACCEPT);
995 * Time to either address the message or decide we can't deliver it yet.
997 if (ctl->errcount > olderrs) /* there were DNS errors above */
999 if (outlevel >= O_DEBUG)
1001 GT_("forwarding and deletion suppressed due to DNS errors\n"));
1002 free(msgblk.headers);
1003 msgblk.headers = NULL;
1004 free_str_list(&msgblk.recipients);
1005 return(PS_TRANSIENT);
1009 /* set up stuffline() so we can deliver the message body through it */
1010 if ((n = open_sink(ctl, &msgblk,
1011 &good_addresses, &bad_addresses)) != PS_SUCCESS)
1013 free(msgblk.headers);
1014 msgblk.headers = NULL;
1015 free_str_list(&msgblk.recipients);
1022 * Some server/sendmail combinations cause problems when our
1023 * synthetic Received line is before the From header. Cope
1026 if ((rcv = strstr(msgblk.headers, "Received:")) == (char *)NULL)
1027 rcv = msgblk.headers;
1028 /* handle ">Received:" lines too */
1029 while (rcv > msgblk.headers && rcv[-1] != '\n')
1031 if (rcv > msgblk.headers)
1036 n = stuffline(ctl, msgblk.headers);
1039 if (!run.invisible && n != -1)
1041 /* utter any per-message Received information we need here */
1042 if (ctl->server.trueaddr) {
1043 #ifdef HAVE_SNPRINTF
1044 snprintf(buf, sizeof(buf),
1047 #endif /* HAVE_SNPRINTF */
1048 "Received: from %s [%u.%u.%u.%u]\r\n",
1049 ctl->server.truename,
1050 (unsigned char)ctl->server.trueaddr[0],
1051 (unsigned char)ctl->server.trueaddr[1],
1052 (unsigned char)ctl->server.trueaddr[2],
1053 (unsigned char)ctl->server.trueaddr[3]);
1055 #ifdef HAVE_SNPRINTF
1056 snprintf(buf, sizeof(buf),
1059 #endif /* HAVE_SNPRINTF */
1060 "Received: from %s\r\n", ctl->server.truename);
1062 n = stuffline(ctl, buf);
1066 * This header is technically invalid under RFC822.
1067 * POP3, IMAP, etc. are not legal mail-parameter values.
1069 #ifdef HAVE_SNPRINTF
1070 snprintf(buf, sizeof(buf),
1073 #endif /* HAVE_SNPRINTF */
1074 "\tby %s with %s (fetchmail-%s",
1078 if (ctl->tracepolls)
1080 sprintf(buf + strlen(buf), " polling %s account %s",
1081 ctl->server.pollname,
1084 #ifdef HAVE_SNPRINTF
1085 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), ")\r\n");
1087 strcat(buf, ")\r\n");
1088 #endif /* HAVE_SNPRINTF */
1089 n = stuffline(ctl, buf);
1093 if (good_addresses == 0)
1095 #ifdef HAVE_SNPRINTF
1096 snprintf(buf+1, sizeof(buf)-1,
1099 #endif /* HAVE_SNPRINTF */
1100 "for %s (by default); ",
1101 rcpt_address (ctl, run.postmaster, 0));
1103 else if (good_addresses == 1)
1105 for (idp = msgblk.recipients; idp; idp = idp->next)
1106 if (idp->val.status.mark == XMIT_ACCEPT)
1107 break; /* only report first address */
1108 #ifdef HAVE_SNPRINTF
1109 snprintf(buf+1, sizeof(buf)-1,
1112 #endif /* HAVE_SNPRINTF */
1113 "for %s", rcpt_address (ctl, idp->id, 1));
1114 sprintf(buf+strlen(buf), " (%s); ",
1115 MULTIDROP(ctl) ? "multi-drop" : "single-drop");
1120 #ifdef HAVE_SNPRINTF
1121 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "%s\r\n",
1124 strcat(buf, rfc822timestamp());
1125 strcat(buf, "\r\n");
1126 #endif /* HAVE_SNPRINTF */
1127 n = stuffline(ctl, buf);
1133 n = stuffline(ctl, rcv); /* ship out rest of msgblk.headers */
1137 report(stdout, GT_("writing RFC822 msgblk.headers\n"));
1139 free(msgblk.headers);
1140 msgblk.headers = NULL;
1141 free_str_list(&msgblk.recipients);
1144 else if ((run.poll_interval == 0 || nodetach) && outlevel >= O_VERBOSE && !isafile(2))
1147 /* write error notifications */
1148 if (no_local_matches || has_nuls || bad_addresses)
1151 char errhd[USERNAMELEN + POPBUFSIZE], *errmsg;
1154 (void) strcpy(errhd, "X-Fetchmail-Warning: ");
1155 if (no_local_matches)
1157 if (reject_count != 1)
1158 strcat(errhd, GT_("no recipient addresses matched declared local names"));
1161 for (idp = msgblk.recipients; idp; idp = idp->next)
1162 if (idp->val.status.mark == XMIT_REJECT)
1164 sprintf(errhd+strlen(errhd), GT_("recipient address %s didn't match any local name"), idp->id);
1170 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1171 strcat(errhd, "; ");
1172 strcat(errhd, GT_("message has embedded NULs"));
1177 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1178 strcat(errhd, "; ");
1179 strcat(errhd, GT_("SMTP listener rejected local recipient addresses: "));
1180 errlen = strlen(errhd);
1181 for (idp = msgblk.recipients; idp; idp = idp->next)
1182 if (idp->val.status.mark == XMIT_RCPTBAD)
1183 errlen += strlen(idp->id) + 2;
1185 xalloca(errmsg, char *, errlen+3);
1186 (void) strcpy(errmsg, errhd);
1187 for (idp = msgblk.recipients; idp; idp = idp->next)
1188 if (idp->val.status.mark == XMIT_RCPTBAD)
1190 strcat(errmsg, idp->id);
1192 strcat(errmsg, ", ");
1197 strcat(errmsg, "\r\n");
1199 /* ship out the error line */
1200 stuffline(ctl, errmsg);
1203 /* issue the delimiter line */
1208 stuffline(ctl, buf);
1210 /* free(msgblk.headers); */
1211 free_str_list(&msgblk.recipients);
1212 return(headers_ok ? PS_SUCCESS : PS_TRUNCATED);
1215 int readbody(int sock, struct query *ctl, flag forward, int len)
1216 /* read and dispose of a message body presented on sock */
1217 /* ctl: query control record */
1218 /* sock: to which the server is connected */
1219 /* len: length of message */
1220 /* forward: TRUE to forward */
1223 unsigned char buf[MSGBUFSIZE+4];
1224 unsigned char *inbufp = buf;
1225 flag issoftline = FALSE;
1228 * Pass through the text lines in the body.
1230 * Yes, this wants to be ||, not &&. The problem is that in the most
1231 * important delimited protocol, POP3, the length is not reliable.
1232 * As usual, the problem is Microsoft brain damage; see FAQ item S2.
1233 * So, for delimited protocols we need to ignore the length here and
1234 * instead drop out of the loop with a break statement when we see
1235 * the message delimiter.
1237 while (protocol->delimited || len > 0)
1239 set_timeout(mytimeout);
1240 if ((linelen = SockRead(sock, inbufp, sizeof(buf)-4-(inbufp-buf)))==-1)
1248 /* write the message size dots */
1251 sizeticker += linelen;
1252 while (sizeticker >= SIZETICKER)
1254 if (outlevel > O_SILENT && (((run.poll_interval == 0 || nodetach) && !isafile(1)) || run.showdots))
1259 sizeticker -= SIZETICKER;
1264 /* check for end of message */
1265 if (protocol->delimited && *inbufp == '.')
1267 if (inbufp[1] == '\r' && inbufp[2] == '\n' && inbufp[3] == '\0')
1269 else if (inbufp[1] == '\n' && inbufp[2] == '\0')
1272 msgblk.msglen--; /* subtract the size of the dot escape */
1275 msgblk.msglen += linelen;
1277 if (ctl->mimedecode && (ctl->mimemsg & MSG_NEEDS_DECODE)) {
1278 issoftline = UnMimeBodyline(&inbufp, protocol->delimited, issoftline);
1279 if (issoftline && (sizeof(buf)-1-(inbufp-buf) < 200))
1282 * Soft linebreak, but less than 200 bytes left in
1283 * input buffer. Rather than doing a buffer overrun,
1284 * ignore the soft linebreak, NL-terminate data and
1285 * deliver what we have now.
1286 * (Who writes lines longer than 2K anyway?)
1288 *inbufp = '\n'; *(inbufp+1) = '\0';
1293 /* ship out the text line */
1294 if (forward && (!issoftline))
1299 /* guard against very long lines */
1300 buf[MSGBUFSIZE+1] = '\r';
1301 buf[MSGBUFSIZE+2] = '\n';
1302 buf[MSGBUFSIZE+3] = '\0';
1304 n = stuffline(ctl, buf);
1308 report(stdout, GT_("writing message text\n"));
1312 else if (outlevel >= O_VERBOSE && !isafile(1))
1323 void init_transact(const struct method *proto)
1324 /* initialize state for the send and receive functions */
1327 tag[0] = '\0'; /* nuke any tag hanging out from previous query */
1328 protocol = (struct method *)proto;
1331 static void enshroud(char *buf)
1332 /* shroud a password in the given buffer */
1336 if (shroud[0] && (cp = strstr(buf, shroud)))
1340 sp = cp + strlen(shroud);
1348 #if defined(HAVE_STDARG_H)
1349 void gen_send(int sock, const char *fmt, ... )
1351 void gen_send(sock, fmt, va_alist)
1352 int sock; /* socket to which server is connected */
1353 const char *fmt; /* printf-style format */
1356 /* assemble command in printf(3) style and send to the server */
1358 char buf [MSGBUFSIZE+1];
1361 if (protocol->tagged && !suppress_tags)
1362 (void) sprintf(buf, "%s ", GENSYM);
1366 #if defined(HAVE_STDARG_H)
1371 #ifdef HAVE_VSNPRINTF
1372 vsnprintf(buf + strlen(buf), sizeof(buf)-strlen(buf), fmt, ap);
1374 vsprintf(buf + strlen(buf), fmt, ap);
1378 #ifdef HAVE_SNPRINTF
1379 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1381 strcat(buf, "\r\n");
1382 #endif /* HAVE_SNPRINTF */
1383 SockWrite(sock, buf, strlen(buf));
1385 if (outlevel >= O_MONITOR)
1388 buf[strlen(buf)-2] = '\0';
1389 report(stdout, "%s> %s\n", protocol->name, buf);
1393 int gen_recv(sock, buf, size)
1394 /* get one line of input from the server */
1395 int sock; /* socket to which server is connected */
1396 char *buf; /* buffer to receive input */
1397 int size; /* length of buffer */
1399 int oldphase = phase; /* we don't have to be re-entrant */
1401 phase = SERVER_WAIT;
1402 set_timeout(mytimeout);
1403 if (SockRead(sock, buf, size) == -1)
1412 if (buf[strlen(buf)-1] == '\n')
1413 buf[strlen(buf)-1] = '\0';
1414 if (buf[strlen(buf)-1] == '\r')
1415 buf[strlen(buf)-1] = '\0';
1416 if (outlevel >= O_MONITOR)
1417 report(stdout, "%s< %s\n", protocol->name, buf);
1423 #if defined(HAVE_STDARG_H)
1424 int gen_transact(int sock, const char *fmt, ... )
1426 int gen_transact(int sock, fmt, va_alist)
1427 int sock; /* socket to which server is connected */
1428 const char *fmt; /* printf-style format */
1431 /* assemble command in printf(3) style, send to server, accept a response */
1434 char buf [MSGBUFSIZE+1];
1436 int oldphase = phase; /* we don't have to be re-entrant */
1438 phase = SERVER_WAIT;
1440 if (protocol->tagged && !suppress_tags)
1441 (void) sprintf(buf, "%s ", GENSYM);
1445 #if defined(HAVE_STDARG_H)
1450 #ifdef HAVE_VSNPRINTF
1451 vsnprintf(buf + strlen(buf), sizeof(buf)-strlen(buf), fmt, ap);
1453 vsprintf(buf + strlen(buf), fmt, ap);
1457 #ifdef HAVE_SNPRINTF
1458 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1460 strcat(buf, "\r\n");
1461 #endif /* HAVE_SNPRINTF */
1462 SockWrite(sock, buf, strlen(buf));
1464 if (outlevel >= O_MONITOR)
1467 buf[strlen(buf)-2] = '\0';
1468 report(stdout, "%s> %s\n", protocol->name, buf);
1471 /* we presume this does its own response echoing */
1472 ok = (protocol->parse_response)(sock, buf);
1478 /* transact.c ends here */