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];
191 #define RBUF_WRITE(value) if (tp < rbuf+sizeof(rbuf)-1) *tp++=value
194 * Try to extract the real envelope addressee. We look here
195 * specifically for the mailserver's Received line.
196 * Note: this will only work for sendmail, or an MTA that
197 * shares sendmail's convention for embedding the envelope
198 * address in the Received line. Sendmail itself only
199 * does this when the mail has a single recipient.
201 if (outlevel >= O_DEBUG)
202 report(stdout, GT_("analyzing Received line:\n%s"), bufp);
204 /* search for whitepace-surrounded "by" followed by valid address */
205 for (base = bufp; ; base = ok + 2)
207 if (!(ok = strstr(base, "by")))
209 else if (!isspace(ok[-1]) || !isspace(ok[2]))
215 /* extract space-delimited token after "by" */
216 for (sp = ok + 2; isspace(*sp); sp++)
219 for (; !isspace(*sp); sp++)
223 /* look for valid address */
224 if (VALID_ADDRESS(rbuf))
227 ok = sp - 1; /* arrange to skip this token */
233 * If it's a DNS name of the mail server, look for the
234 * recipient name after a following "for". Otherwise
237 if (is_host_alias(rbuf, ctl))
239 if (outlevel >= O_DEBUG)
241 GT_("line accepted, %s is an alias of the mailserver\n"), rbuf);
245 if (outlevel >= O_DEBUG)
247 GT_("line rejected, %s is not an alias of the mailserver\n"),
252 /* search for whitepace-surrounded "for" followed by xxxx@yyyy */
253 for (base = ok + 4 + strlen(rbuf); ; base = ok + 2)
255 if (!(ok = strstr(base, "for")))
257 else if (!isspace(ok[-1]) || !isspace(ok[3]))
263 /* extract space-delimited token after "for" */
264 for (sp = ok + 3; isspace(*sp); sp++)
267 for (; !isspace(*sp); sp++)
271 if (strchr(rbuf, '@'))
274 ok = sp - 1; /* arrange to skip this token */
279 flag want_gt = FALSE;
282 /* char after "for" could be space or a continuation newline */
283 for (sp = ok + 4; isspace(*sp); sp++)
286 RBUF_WRITE(':'); /* Here is the hack. This is to be friends */
287 RBUF_WRITE(' '); /* with nxtaddr()... */
293 while (*sp == '@') /* skip routes */
294 while (*sp && *sp++ != ':')
297 && (want_gt ? (*sp != '>') : !isspace(*sp))
306 /* uh oh -- whitespace here can't be right! */
312 if (strlen(rbuf) <= 3) /* apparently nothing has been found */
320 if (outlevel >= O_DEBUG)
321 report(stdout, GT_("no Received address found\n"));
326 if (outlevel >= O_DEBUG) {
327 char *lf = rbuf + strlen(rbuf)-1;
329 if (outlevel >= O_DEBUG)
330 report(stdout, GT_("found Received address `%s'\n"), rbuf+2);
337 /* shared by readheaders and readbody */
338 static int sizeticker;
340 #define EMPTYLINE(s) ((s)[0] == '\r' && (s)[1] == '\n' && (s)[2] == '\0')
342 int readheaders(int sock,
347 /* read message headers and ship to SMTP or MDA */
348 /* sock: to which the server is connected */
349 /* fetchlen: length of message according to fetch response */
350 /* reallen: length of message according to getsizes */
351 /* ctl: query control record */
352 /* num: index of message */
357 struct addrblk *next;
359 struct addrblk *to_addrchain = NULL;
360 struct addrblk **to_chainptr = &to_addrchain;
361 struct addrblk *resent_to_addrchain = NULL;
362 struct addrblk **resent_to_chainptr = &resent_to_addrchain;
364 char buf[MSGBUFSIZE+1];
365 int from_offs, reply_to_offs, resent_from_offs;
366 int app_from_offs, sender_offs, resent_sender_offs;
368 char *received_for, *rcv, *cp, *delivered_to;
369 int n, linelen, oldlen, ch, remaining, skipcount;
371 flag no_local_matches = FALSE;
372 flag headers_ok, has_nuls;
373 int olderrs, good_addresses, bad_addresses;
376 has_nuls = headers_ok = FALSE;
377 msgblk.return_path[0] = '\0';
378 olderrs = ctl->errcount;
380 /* read message headers */
381 msgblk.reallen = reallen;
384 * We used to free the header block unconditionally at the end of
385 * readheaders, but it turns out that if close_sink() hits an error
386 * condition the code for sending bouncemail will actually look
387 * at the freed storage and coredump...
390 free(msgblk.headers);
392 /* initially, no message ID */
397 msgblk.headers = received_for = delivered_to = NULL;
398 from_offs = reply_to_offs = resent_from_offs = app_from_offs =
399 sender_offs = resent_sender_offs = env_offs = -1;
405 for (remaining = fetchlen; remaining > 0 || protocol->delimited; remaining -= linelen)
408 int overlong = FALSE;
410 line = xmalloc(sizeof(buf));
414 set_timeout(mytimeout);
415 if ((n = SockRead(sock, buf, sizeof(buf)-1)) == -1) {
418 free(msgblk.headers);
419 msgblk.headers = NULL;
427 * Try to gracefully handle the case, where the length of a
428 * line exceeds MSGBUFSIZE.
430 if ( n && buf[n-1] != '\n' ) {
431 unsigned int llen = strlen(line);
433 line = realloc(line, llen + n + 1);
434 strcpy(line + llen, buf);
435 ch = ' '; /* So the next iteration starts */
439 /* lines may not be properly CRLF terminated; fix this for qmail */
442 cp = buf + strlen(buf) - 1;
443 if (*cp == '\n' && (cp == buf || cp[-1] != '\r'))
452 * Decode MIME encoded headers. We MUST do this before
453 * looking at the Content-Type / Content-Transfer-Encoding
454 * headers (RFC 2046).
456 if ( ctl->mimedecode && overlong ) {
458 * If we received an overlong line, we have to decode the
459 * whole line at once.
461 line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
466 if ( ctl->mimedecode )
469 line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
473 /* check for end of headers */
477 has_nuls = (linelen != strlen(line));
479 goto process_headers;
483 * Check for end of message immediately. If one of your folders
484 * has been mangled, the delimiter may occur directly after the
487 if (protocol->delimited && line[0] == '.' && EMPTYLINE(line+1))
490 has_nuls = (linelen != strlen(line));
492 goto process_headers;
496 * At least one brain-dead website (netmind.com) is known to
497 * send out robotmail that's missing the RFC822 delimiter blank
498 * line before the body! Without this check fetchmail segfaults.
499 * With it, we treat such messages as though they had the missing
502 if (!isspace(line[0]) && !strchr(line, ':'))
505 has_nuls = (linelen != strlen(line));
507 goto process_headers;
510 /* check for RFC822 continuations */
511 set_timeout(mytimeout);
515 (ch == ' ' || ch == '\t'); /* continuation to next line? */
517 /* write the message size dots */
518 if ((outlevel > O_SILENT && outlevel < O_VERBOSE) && linelen > 0)
520 sizeticker += linelen;
521 while (sizeticker >= SIZETICKER)
523 if ((!run.use_syslog && !isafile(1)) || run.showdots)
528 sizeticker -= SIZETICKER;
532 /* we see an ordinary (non-header, non-message-delimiter line */
533 has_nuls = (linelen != strlen(line));
535 /* save the message's ID, we may use it for killing duplicates later */
536 if (MULTIDROP(ctl) && !strncasecmp(line, "Message-ID:", 11))
537 ctl->thisid = xstrdup(line);
540 * The University of Washington IMAP server (the reference
541 * implementation of IMAP4 written by Mark Crispin) relies
542 * on being able to keep base-UID information in a special
543 * message at the head of the mailbox. This message should
544 * neither be deleted nor forwarded.
548 * We disable this check under POP2 because there's no way to
549 * prevent deletion of the message. So at least we ought to
550 * forward it to the user so he or she will have some clue
551 * that things have gone awry.
554 if (strncmp(protocol->service, "pop2", 4))
555 #else /* INET6_ENABLE */
556 if (protocol->port != 109)
557 #endif /* INET6_ENABLE */
558 #endif /* POP2_ENABLE */
559 if (num == 1 && !strncasecmp(line, "X-IMAP:", 7)) {
561 free(msgblk.headers);
562 msgblk.headers = NULL;
567 * This code prevents fetchmail from becoming an accessory after
568 * the fact to upstream sendmails with the `E' option on. It also
569 * copes with certain brain-dead POP servers (like NT's) that pass
570 * through Unix from_ lines.
572 * Either of these bugs can result in a non-RFC822 line at the
573 * beginning of the headers. If fetchmail just passes it
574 * through, the client listener may think the message has *no*
575 * headers (since the first) line it sees doesn't look
576 * RFC822-conformant) and fake up a set.
578 * What the user would see in this case is bogus (synthesized)
579 * headers, followed by a blank line, followed by the >From,
580 * followed by the real headers, followed by a blank line,
583 * We forestall this lossage by tossing anything that looks
584 * like an escaped or passed-through From_ line in headers.
585 * These aren't RFC822 so our conscience is clear...
587 if (!strncasecmp(line, ">From ", 6) || !strncasecmp(line, "From ", 5))
594 * We remove all Delivered-To: headers.
596 * This is to avoid false mail loops messages when delivering
597 * local messages to and from a Postfix/qmail mailserver.
599 if (ctl->dropdelivered && !strncasecmp(line, "Delivered-To:", 13))
609 * If we see a Status line, it may have been inserted by an MUA
610 * on the mail host, or it may have been inserted by the server
611 * program after the headers in the transaction stream. This
612 * can actually hose some new-mail notifiers such as xbuffy,
613 * which assumes any Status line came from a *local* MDA and
614 * therefore indicates that the message has been seen.
616 * Some buggy POP servers (including at least the 3.3(20)
617 * version of the one distributed with IMAP) insert empty
618 * Status lines in the transaction stream; we'll chuck those
619 * unconditionally. Nonempty ones get chucked if the user
620 * turns on the dropstatus flag.
625 if (!strncasecmp(line, "Status:", 7))
627 else if (!strncasecmp(line, "X-Mozilla-Status:", 17))
632 while (*cp && isspace(*cp)) cp++;
633 if (!*cp || ctl->dropstatus)
642 line = reply_hack(line, ctl->server.truename);
645 * OK, this is messy. If we're forwarding by SMTP, it's the
646 * SMTP-receiver's job (according to RFC821, page 22, section
647 * 4.1.1) to generate a Return-Path line on final delivery.
648 * The trouble is, we've already got one because the
649 * mailserver's SMTP thought *it* was responsible for final
652 * Stash away the contents of Return-Path (as modified by reply_hack)
653 * for use in generating MAIL FROM later on, then prevent the header
654 * from being saved with the others. In effect, we strip it off here.
656 * If the SMTP server conforms to the standards, and fetchmail gets the
657 * envelope sender from the Return-Path, the new Return-Path should be
658 * exactly the same as the original one.
660 * We do *not* want to ignore empty Return-Path headers. These should
661 * be passed through as a way of indicating that a message should
662 * not trigger bounces if delivery fails. What we *do* need to do is
663 * make sure we never try to rewrite such a blank Return-Path. We
664 * handle this with a check for <> in the rewrite logic above.
666 if (!strncasecmp("Return-Path:", line, 12) && (cp = nxtaddr(line)))
668 strncpy(msgblk.return_path, cp, sizeof(msgblk.return_path));
669 msgblk.return_path[sizeof(msgblk.return_path)-1] = '\0';
678 oldlen = strlen(line);
679 msgblk.headers = xmalloc(oldlen + 1);
680 (void) strcpy(msgblk.headers, line);
682 line = msgblk.headers;
689 newlen = oldlen + strlen(line);
690 newhdrs = (char *) realloc(msgblk.headers, newlen + 1);
691 if (newhdrs == NULL) {
695 msgblk.headers = newhdrs;
696 strcpy(msgblk.headers + oldlen, line);
698 line = msgblk.headers + oldlen;
702 /* find offsets of various special headers */
703 if (!strncasecmp("From:", line, 5))
704 from_offs = (line - msgblk.headers);
705 else if (!strncasecmp("Reply-To:", line, 9))
706 reply_to_offs = (line - msgblk.headers);
707 else if (!strncasecmp("Resent-From:", line, 12))
708 resent_from_offs = (line - msgblk.headers);
709 else if (!strncasecmp("Apparently-From:", line, 16))
710 app_from_offs = (line - msgblk.headers);
712 * Netscape 4.7 puts "Sender: zap" in mail headers. Perverse...
714 * But a literal reading of RFC822 sec. 4.4.2 supports the idea
715 * that Sender: *doesn't* have to be a working email address.
717 * The definition of the Sender header in RFC822 says, in
718 * part, "The Sender mailbox specification includes a word
719 * sequence which must correspond to a specific agent (i.e., a
720 * human user or a computer program) rather than a standard
721 * address." That implies that the contents of the Sender
722 * field don't need to be a legal email address at all So
723 * ignore any Sender or Resent-Semnder lines unless they
726 * (RFC2822 says the condents of Sender must be a valid mailbox
727 * address, which is also what RFC822 4.4.4 implies.)
729 else if (!strncasecmp("Sender:", line, 7) && (strchr(line, '@') || strchr(line, '!')))
730 sender_offs = (line - msgblk.headers);
731 else if (!strncasecmp("Resent-Sender:", line, 14) && (strchr(line, '@') || strchr(line, '!')))
732 resent_sender_offs = (line - msgblk.headers);
735 else if (!strncasecmp("Message-Id:", line, 11))
737 if (ctl->server.uidl)
741 line[IDLEN+12] = 0; /* prevent stack overflow */
742 sscanf(line+12, "%s", id);
743 if (!str_find( &ctl->newsaved, num))
745 struct idlist *new = save_str(&ctl->newsaved,id,UID_SEEN);
746 new->val.status.num = num;
750 #endif /* __UNUSED__ */
752 /* if multidrop is on, gather addressee headers */
755 if (!strncasecmp("To:", line, 3)
756 || !strncasecmp("Cc:", line, 3)
757 || !strncasecmp("Bcc:", line, 4)
758 || !strncasecmp("Apparently-To:", line, 14))
760 *to_chainptr = xmalloc(sizeof(struct addrblk));
761 (*to_chainptr)->offset = (line - msgblk.headers);
762 to_chainptr = &(*to_chainptr)->next;
766 else if (!strncasecmp("Resent-To:", line, 10)
767 || !strncasecmp("Resent-Cc:", line, 10)
768 || !strncasecmp("Resent-Bcc:", line, 11))
770 *resent_to_chainptr = xmalloc(sizeof(struct addrblk));
771 (*resent_to_chainptr)->offset = (line - msgblk.headers);
772 resent_to_chainptr = &(*resent_to_chainptr)->next;
773 *resent_to_chainptr = NULL;
776 else if (ctl->server.envelope != STRING_DISABLED)
778 if (ctl->server.envelope
779 && strcasecmp(ctl->server.envelope, "Received"))
781 if (env_offs == -1 && !strncasecmp(ctl->server.envelope,
783 strlen(ctl->server.envelope)))
785 if (skipcount++ < ctl->server.envskip)
787 env_offs = (line - msgblk.headers);
790 else if (!received_for && !strncasecmp("Received:", line, 9))
792 if (skipcount++ < ctl->server.envskip)
794 received_for = parse_received(ctl, line);
802 * When mail delivered to a multidrop mailbox on the server is
803 * addressed to multiple people on the client machine, there will
804 * be one copy left in the box for each recipient. This is not a
805 * problem if we have the actual recipient address to dispatch on
806 * (e.g. because we've mined it out of sendmail trace headers, or
807 * a qmail Delivered-To line, or a declared sender envelope line).
809 * But if we're mining addressees out of the To/Cc/Bcc fields, and
810 * if the mail is addressed to N people, each recipient will
811 * get N copies. This is bad when N > 1.
813 * Foil this by suppressing all but one copy of a message with
814 * a given Message-ID. The accept_count test ensures that
815 * multiple pieces of email with the same Message-ID, each
816 * with a *single* addressee (the N == 1 case), won't be
819 * Note: This implementation only catches runs of successive
820 * messages with the same ID, but that should be good
821 * enough. A more general implementation would have to store
822 * ever-growing lists of seen message-IDs; in a long-running
823 * daemon this would turn into a memory leak even if the
824 * implementation were perfect.
826 * Don't mess with this code casually. It would be way too easy
827 * to break it in a way that blackholed mail. Better to pass
828 * the occasional duplicate than to do that...
830 if (!received_for && env_offs == -1 && !delivered_to)
832 if (ctl->lastid && ctl->thisid && !strcasecmp(ctl->lastid, ctl->thisid))
834 if (accept_count > 1)
841 ctl->lastid = ctl->thisid;
847 * We want to detect this early in case there are so few headers that the
848 * dispatch logic barfs.
852 if (outlevel > O_SILENT)
854 GT_("message delimiter found while scanning headers\n"));
858 * Hack time. If the first line of the message was blank, with no headers
859 * (this happens occasionally due to bad gatewaying software) cons up
860 * a set of fake headers.
862 * If you modify the fake header template below, be sure you don't
863 * make either From or To address @-less, otherwise the reply_hack
864 * logic will do bad things.
866 if (msgblk.headers == (char *)NULL)
869 snprintf(buf, sizeof(buf),
872 #endif /* HAVE_SNPRINTF */
873 "From: FETCHMAIL-DAEMON\r\nTo: %s@%s\r\nSubject: Headerless mail from %s's mailbox on %s\r\n",
874 user, fetchmailhost, ctl->remotename, ctl->server.truename);
875 msgblk.headers = xstrdup(buf);
879 * We can now process message headers before reading the text.
880 * In fact we have to, as this will tell us where to forward to.
883 /* Check for MIME headers indicating possible 8-bit data */
884 ctl->mimemsg = MimeBodyType(msgblk.headers, ctl->mimedecode);
887 if (ctl->server.sdps && sdps_envfrom)
889 /* We have the real envelope return-path, stored out of band by
890 * SDPS - that's more accurate than any header is going to be.
892 strcpy(msgblk.return_path, sdps_envfrom);
895 #endif /* SDPS_ENABLE */
897 * If there is a Return-Path address on the message, this was
898 * almost certainly the MAIL FROM address given the originating
899 * sendmail. This is the best thing to use for logging the
900 * message origin (it sets up the right behavior for bounces and
901 * mailing lists). Otherwise, fall down to the next available
902 * envelope address (which is the most probable real sender).
903 * *** The order is important! ***
904 * This is especially useful when receiving mailing list
905 * messages in multidrop mode. if a local address doesn't
906 * exist, the bounce message won't be returned blindly to the
907 * author or to the list itself but rather to the list manager
908 * (ex: specified by "Sender:") which is much less annoying. This
909 * is true for most mailing list packages.
911 if( !msgblk.return_path[0] ){
913 if (resent_sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_sender_offs)));
914 else if (sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + sender_offs)));
915 else if (resent_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_from_offs)));
916 else if (from_offs >= 0 && (ap = nxtaddr(msgblk.headers + from_offs)));
917 else if (reply_to_offs >= 0 && (ap = nxtaddr(msgblk.headers + reply_to_offs)));
918 else if (app_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + app_from_offs)));
919 /* multi-line MAIL FROM addresses confuse SMTP terribly */
920 if (ap && !strchr(ap, '\n')) {
921 strncpy(msgblk.return_path, ap, sizeof(msgblk.return_path));
922 msgblk.return_path[sizeof(msgblk.return_path)-1] = '\0';
926 /* cons up a list of local recipients */
927 msgblk.recipients = (struct idlist *)NULL;
928 accept_count = reject_count = 0;
929 /* is this a multidrop box? */
933 if (ctl->server.sdps && sdps_envto)
935 /* We have the real envelope recipient, stored out of band by
936 * SDPS - that's more accurate than any header is going to be.
938 find_server_names(sdps_envto, ctl, &msgblk.recipients);
941 #endif /* SDPS_ENABLE */
942 if (env_offs > -1) /* We have the actual envelope addressee */
943 find_server_names(msgblk.headers + env_offs, ctl, &msgblk.recipients);
944 else if (delivered_to && ctl->server.envelope != STRING_DISABLED &&
945 ctl->server.envelope && !strcasecmp(ctl->server.envelope, "Delivered-To"))
947 find_server_names(delivered_to, ctl, &msgblk.recipients);
950 else if (received_for)
952 * We have the Received for addressee.
953 * It has to be a mailserver address, or we
954 * wouldn't have got here.
955 * We use find_server_names() to let local
956 * hostnames go through.
958 find_server_names(received_for, ctl, &msgblk.recipients);
962 * We haven't extracted the envelope address.
963 * So check all the "Resent-To" header addresses if
964 * they exist. If and only if they don't, consider
965 * the "To" addresses.
967 register struct addrblk *nextptr;
968 if (resent_to_addrchain) {
969 /* delete the "To" chain and substitute it
970 * with the "Resent-To" list
972 while (to_addrchain) {
973 nextptr = to_addrchain->next;
975 to_addrchain = nextptr;
977 to_addrchain = resent_to_addrchain;
978 resent_to_addrchain = NULL;
980 /* now look for remaining adresses */
981 while (to_addrchain) {
982 find_server_names(msgblk.headers+to_addrchain->offset, ctl, &msgblk.recipients);
983 nextptr = to_addrchain->next;
985 to_addrchain = nextptr;
990 no_local_matches = TRUE;
991 save_str(&msgblk.recipients, run.postmaster, XMIT_ACCEPT);
992 if (outlevel >= O_DEBUG)
994 GT_("no local matches, forwarding to %s\n"),
998 else /* it's a single-drop box, use first localname */
999 save_str(&msgblk.recipients, ctl->localnames->id, XMIT_ACCEPT);
1003 * Time to either address the message or decide we can't deliver it yet.
1005 if (ctl->errcount > olderrs) /* there were DNS errors above */
1007 if (outlevel >= O_DEBUG)
1009 GT_("forwarding and deletion suppressed due to DNS errors\n"));
1010 free(msgblk.headers);
1011 msgblk.headers = NULL;
1012 free_str_list(&msgblk.recipients);
1013 return(PS_TRANSIENT);
1017 /* set up stuffline() so we can deliver the message body through it */
1018 if ((n = open_sink(ctl, &msgblk,
1019 &good_addresses, &bad_addresses)) != PS_SUCCESS)
1021 free(msgblk.headers);
1022 msgblk.headers = NULL;
1023 free_str_list(&msgblk.recipients);
1030 * Some server/sendmail combinations cause problems when our
1031 * synthetic Received line is before the From header. Cope
1034 if ((rcv = strstr(msgblk.headers, "Received:")) == (char *)NULL)
1035 rcv = msgblk.headers;
1036 /* handle ">Received:" lines too */
1037 while (rcv > msgblk.headers && rcv[-1] != '\n')
1039 if (rcv > msgblk.headers)
1044 n = stuffline(ctl, msgblk.headers);
1047 if (!run.invisible && n != -1)
1049 /* utter any per-message Received information we need here */
1050 if (ctl->server.trueaddr) {
1051 #ifdef HAVE_SNPRINTF
1052 snprintf(buf, sizeof(buf),
1055 #endif /* HAVE_SNPRINTF */
1056 "Received: from %s [%u.%u.%u.%u]\r\n",
1057 ctl->server.truename,
1058 (unsigned char)ctl->server.trueaddr[0],
1059 (unsigned char)ctl->server.trueaddr[1],
1060 (unsigned char)ctl->server.trueaddr[2],
1061 (unsigned char)ctl->server.trueaddr[3]);
1063 #ifdef HAVE_SNPRINTF
1064 snprintf(buf, sizeof(buf),
1067 #endif /* HAVE_SNPRINTF */
1068 "Received: from %s\r\n", ctl->server.truename);
1070 n = stuffline(ctl, buf);
1074 * This header is technically invalid under RFC822.
1075 * POP3, IMAP, etc. are not legal mail-parameter values.
1077 #ifdef HAVE_SNPRINTF
1078 snprintf(buf, sizeof(buf),
1081 #endif /* HAVE_SNPRINTF */
1082 "\tby %s with %s (fetchmail-%s",
1086 if (ctl->tracepolls)
1088 sprintf(buf + strlen(buf), " polling %s account %s",
1089 ctl->server.pollname,
1092 #ifdef HAVE_SNPRINTF
1093 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), ")\r\n");
1095 strcat(buf, ")\r\n");
1096 #endif /* HAVE_SNPRINTF */
1097 n = stuffline(ctl, buf);
1101 if (good_addresses == 0)
1103 #ifdef HAVE_SNPRINTF
1104 snprintf(buf+1, sizeof(buf)-1,
1107 #endif /* HAVE_SNPRINTF */
1108 "for %s (by default); ",
1109 rcpt_address (ctl, run.postmaster, 0));
1111 else if (good_addresses == 1)
1113 for (idp = msgblk.recipients; idp; idp = idp->next)
1114 if (idp->val.status.mark == XMIT_ACCEPT)
1115 break; /* only report first address */
1116 #ifdef HAVE_SNPRINTF
1117 snprintf(buf+1, sizeof(buf)-1,
1120 #endif /* HAVE_SNPRINTF */
1121 "for %s", rcpt_address (ctl, idp->id, 1));
1122 sprintf(buf+strlen(buf), " (%s); ",
1123 MULTIDROP(ctl) ? "multi-drop" : "single-drop");
1128 #ifdef HAVE_SNPRINTF
1129 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "%s\r\n",
1132 strcat(buf, rfc822timestamp());
1133 strcat(buf, "\r\n");
1134 #endif /* HAVE_SNPRINTF */
1135 n = stuffline(ctl, buf);
1141 n = stuffline(ctl, rcv); /* ship out rest of msgblk.headers */
1145 report(stdout, GT_("writing RFC822 msgblk.headers\n"));
1147 free(msgblk.headers);
1148 msgblk.headers = NULL;
1149 free_str_list(&msgblk.recipients);
1152 else if ((run.poll_interval == 0 || nodetach) && outlevel >= O_VERBOSE && !isafile(2))
1155 /* write error notifications */
1156 if (no_local_matches || has_nuls || bad_addresses)
1159 char errhd[USERNAMELEN + POPBUFSIZE], *errmsg;
1162 (void) strcpy(errhd, "X-Fetchmail-Warning: ");
1163 if (no_local_matches)
1165 if (reject_count != 1)
1166 strcat(errhd, GT_("no recipient addresses matched declared local names"));
1169 for (idp = msgblk.recipients; idp; idp = idp->next)
1170 if (idp->val.status.mark == XMIT_REJECT)
1172 #ifdef HAVE_SNPRINTF
1173 snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd),
1175 sprintf(errhd+strlen(errhd),
1176 #endif /* HAVE_SNPRINTF */
1177 GT_("recipient address %s didn't match any local name"), idp->id);
1183 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1184 #ifdef HAVE_SNPRINTF
1185 snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd), "; ");
1186 snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd),
1188 strcat(errhd, "; ");
1190 #endif /* HAVE_SNPRINTF */
1191 GT_("message has embedded NULs"));
1196 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1197 #ifdef HAVE_SNPRINTF
1198 snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd), "; ");
1199 snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd),
1201 strcat(errhd, "; ");
1203 #endif /* HAVE_SNPRINTF */
1204 GT_("SMTP listener rejected local recipient addresses: "));
1205 errlen = strlen(errhd);
1206 for (idp = msgblk.recipients; idp; idp = idp->next)
1207 if (idp->val.status.mark == XMIT_RCPTBAD)
1208 errlen += strlen(idp->id) + 2;
1210 xalloca(errmsg, char *, errlen+3);
1211 (void) strcpy(errmsg, errhd);
1212 for (idp = msgblk.recipients; idp; idp = idp->next)
1213 if (idp->val.status.mark == XMIT_RCPTBAD)
1215 strcat(errmsg, idp->id);
1217 strcat(errmsg, ", ");
1222 strcat(errmsg, "\r\n");
1224 /* ship out the error line */
1225 stuffline(ctl, errmsg);
1228 /* issue the delimiter line */
1233 stuffline(ctl, buf);
1235 /* free(msgblk.headers); */
1236 free_str_list(&msgblk.recipients);
1237 return(headers_ok ? PS_SUCCESS : PS_TRUNCATED);
1240 int readbody(int sock, struct query *ctl, flag forward, int len)
1241 /* read and dispose of a message body presented on sock */
1242 /* ctl: query control record */
1243 /* sock: to which the server is connected */
1244 /* len: length of message */
1245 /* forward: TRUE to forward */
1248 unsigned char buf[MSGBUFSIZE+4];
1249 unsigned char *inbufp = buf;
1250 flag issoftline = FALSE;
1253 * Pass through the text lines in the body.
1255 * Yes, this wants to be ||, not &&. The problem is that in the most
1256 * important delimited protocol, POP3, the length is not reliable.
1257 * As usual, the problem is Microsoft brain damage; see FAQ item S2.
1258 * So, for delimited protocols we need to ignore the length here and
1259 * instead drop out of the loop with a break statement when we see
1260 * the message delimiter.
1262 while (protocol->delimited || len > 0)
1264 set_timeout(mytimeout);
1265 if ((linelen = SockRead(sock, inbufp, sizeof(buf)-4-(inbufp-buf)))==-1)
1273 /* write the message size dots */
1276 sizeticker += linelen;
1277 while (sizeticker >= SIZETICKER)
1279 if (outlevel > O_SILENT && (((run.poll_interval == 0 || nodetach) && !isafile(1)) || run.showdots))
1284 sizeticker -= SIZETICKER;
1289 /* check for end of message */
1290 if (protocol->delimited && *inbufp == '.')
1292 if (inbufp[1] == '\r' && inbufp[2] == '\n' && inbufp[3] == '\0')
1294 else if (inbufp[1] == '\n' && inbufp[2] == '\0')
1297 msgblk.msglen--; /* subtract the size of the dot escape */
1300 msgblk.msglen += linelen;
1302 if (ctl->mimedecode && (ctl->mimemsg & MSG_NEEDS_DECODE)) {
1303 issoftline = UnMimeBodyline(&inbufp, protocol->delimited, issoftline);
1304 if (issoftline && (sizeof(buf)-1-(inbufp-buf) < 200))
1307 * Soft linebreak, but less than 200 bytes left in
1308 * input buffer. Rather than doing a buffer overrun,
1309 * ignore the soft linebreak, NL-terminate data and
1310 * deliver what we have now.
1311 * (Who writes lines longer than 2K anyway?)
1313 *inbufp = '\n'; *(inbufp+1) = '\0';
1318 /* ship out the text line */
1319 if (forward && (!issoftline))
1324 /* guard against very long lines */
1325 buf[MSGBUFSIZE+1] = '\r';
1326 buf[MSGBUFSIZE+2] = '\n';
1327 buf[MSGBUFSIZE+3] = '\0';
1329 n = stuffline(ctl, buf);
1333 report(stdout, GT_("writing message text\n"));
1337 else if (outlevel >= O_VERBOSE && !isafile(1))
1348 void init_transact(const struct method *proto)
1349 /* initialize state for the send and receive functions */
1352 tag[0] = '\0'; /* nuke any tag hanging out from previous query */
1353 protocol = (struct method *)proto;
1356 static void enshroud(char *buf)
1357 /* shroud a password in the given buffer */
1361 if (shroud[0] && (cp = strstr(buf, shroud)))
1365 sp = cp + strlen(shroud);
1373 #if defined(HAVE_STDARG_H)
1374 void gen_send(int sock, const char *fmt, ... )
1376 void gen_send(sock, fmt, va_alist)
1377 int sock; /* socket to which server is connected */
1378 const char *fmt; /* printf-style format */
1381 /* assemble command in printf(3) style and send to the server */
1383 char buf [MSGBUFSIZE+1];
1386 if (protocol->tagged && !suppress_tags)
1387 (void) sprintf(buf, "%s ", GENSYM);
1391 #if defined(HAVE_STDARG_H)
1396 #ifdef HAVE_VSNPRINTF
1397 vsnprintf(buf + strlen(buf), sizeof(buf)-strlen(buf), fmt, ap);
1399 vsprintf(buf + strlen(buf), fmt, ap);
1403 #ifdef HAVE_SNPRINTF
1404 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1406 strcat(buf, "\r\n");
1407 #endif /* HAVE_SNPRINTF */
1408 SockWrite(sock, buf, strlen(buf));
1410 if (outlevel >= O_MONITOR)
1413 buf[strlen(buf)-2] = '\0';
1414 report(stdout, "%s> %s\n", protocol->name, buf);
1418 int gen_recv(sock, buf, size)
1419 /* get one line of input from the server */
1420 int sock; /* socket to which server is connected */
1421 char *buf; /* buffer to receive input */
1422 int size; /* length of buffer */
1424 int oldphase = phase; /* we don't have to be re-entrant */
1426 phase = SERVER_WAIT;
1427 set_timeout(mytimeout);
1428 if (SockRead(sock, buf, size) == -1)
1437 if (buf[strlen(buf)-1] == '\n')
1438 buf[strlen(buf)-1] = '\0';
1439 if (buf[strlen(buf)-1] == '\r')
1440 buf[strlen(buf)-1] = '\0';
1441 if (outlevel >= O_MONITOR)
1442 report(stdout, "%s< %s\n", protocol->name, buf);
1448 #if defined(HAVE_STDARG_H)
1449 int gen_transact(int sock, const char *fmt, ... )
1451 int gen_transact(int sock, fmt, va_alist)
1452 int sock; /* socket to which server is connected */
1453 const char *fmt; /* printf-style format */
1456 /* assemble command in printf(3) style, send to server, accept a response */
1459 char buf [MSGBUFSIZE+1];
1461 int oldphase = phase; /* we don't have to be re-entrant */
1463 phase = SERVER_WAIT;
1465 if (protocol->tagged && !suppress_tags)
1466 (void) sprintf(buf, "%s ", GENSYM);
1470 #if defined(HAVE_STDARG_H)
1475 #ifdef HAVE_VSNPRINTF
1476 vsnprintf(buf + strlen(buf), sizeof(buf)-strlen(buf), fmt, ap);
1478 vsprintf(buf + strlen(buf), fmt, ap);
1482 #ifdef HAVE_SNPRINTF
1483 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1485 strcat(buf, "\r\n");
1486 #endif /* HAVE_SNPRINTF */
1487 SockWrite(sock, buf, strlen(buf));
1489 if (outlevel >= O_MONITOR)
1492 buf[strlen(buf)-2] = '\0';
1493 report(stdout, "%s> %s\n", protocol->name, buf);
1496 /* we presume this does its own response echoing */
1497 ok = (protocol->parse_response)(sock, buf);
1503 /* transact.c ends here */