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') \
341 || ((s)[0] == '\n' && (s)[1] == '\0'))
343 static int end_of_header (const char *s)
344 /* accept "\r*\n" as EOH in order to be bulletproof against broken survers */
348 return (s[0] == '\n' && s[1] == '\0');
351 int readheaders(int sock,
356 /* read message headers and ship to SMTP or MDA */
357 /* sock: to which the server is connected */
358 /* fetchlen: length of message according to fetch response */
359 /* reallen: length of message according to getsizes */
360 /* ctl: query control record */
361 /* num: index of message */
366 struct addrblk *next;
368 struct addrblk *to_addrchain = NULL;
369 struct addrblk **to_chainptr = &to_addrchain;
370 struct addrblk *resent_to_addrchain = NULL;
371 struct addrblk **resent_to_chainptr = &resent_to_addrchain;
373 char buf[MSGBUFSIZE+1];
374 int from_offs, reply_to_offs, resent_from_offs;
375 int app_from_offs, sender_offs, resent_sender_offs;
377 char *received_for, *rcv, *cp;
378 static char *delivered_to = NULL;
379 int n, linelen, oldlen, ch, remaining, skipcount;
381 flag no_local_matches = FALSE;
382 flag headers_ok, has_nuls;
383 int olderrs, good_addresses, bad_addresses;
385 flag already_has_return_path = FALSE;
388 has_nuls = headers_ok = FALSE;
389 msgblk.return_path[0] = '\0';
390 olderrs = ctl->errcount;
392 /* read message headers */
393 msgblk.reallen = reallen;
396 * We used to free the header block unconditionally at the end of
397 * readheaders, but it turns out that if close_sink() hits an error
398 * condition the code for sending bouncemail will actually look
399 * at the freed storage and coredump...
402 free(msgblk.headers);
403 free_str_list(&msgblk.recipients);
407 /* initially, no message ID */
412 msgblk.headers = received_for = delivered_to = NULL;
413 from_offs = reply_to_offs = resent_from_offs = app_from_offs =
414 sender_offs = resent_sender_offs = env_offs = -1;
420 for (remaining = fetchlen; remaining > 0 || protocol->delimited; remaining -= linelen)
423 int overlong = FALSE;
425 line = xmalloc(sizeof(buf));
429 set_timeout(mytimeout);
430 if ((n = SockRead(sock, buf, sizeof(buf)-1)) == -1) {
433 free(msgblk.headers);
434 msgblk.headers = NULL;
442 * Try to gracefully handle the case, where the length of a
443 * line exceeds MSGBUFSIZE.
445 if ( n && buf[n-1] != '\n' ) {
446 unsigned int llen = strlen(line);
448 line = realloc(line, llen + n + 1);
449 strcpy(line + llen, buf);
450 ch = ' '; /* So the next iteration starts */
454 /* lines may not be properly CRLF terminated; fix this for qmail */
457 cp = buf + strlen(buf) - 1;
458 if (*cp == '\n' && (cp == buf || cp[-1] != '\r'))
467 * Decode MIME encoded headers. We MUST do this before
468 * looking at the Content-Type / Content-Transfer-Encoding
469 * headers (RFC 2046).
471 if ( ctl->mimedecode && overlong ) {
473 * If we received an overlong line, we have to decode the
474 * whole line at once.
476 line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
481 if ( ctl->mimedecode )
484 line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
488 /* check for end of headers */
489 if (end_of_header(line))
492 has_nuls = (linelen != strlen(line));
494 goto process_headers;
498 * Check for end of message immediately. If one of your folders
499 * has been mangled, the delimiter may occur directly after the
502 if (protocol->delimited && line[0] == '.' && EMPTYLINE(line+1))
505 has_nuls = (linelen != strlen(line));
507 goto process_headers;
511 * At least one brain-dead website (netmind.com) is known to
512 * send out robotmail that's missing the RFC822 delimiter blank
513 * line before the body! Without this check fetchmail segfaults.
514 * With it, we treat such messages as though they had the missing
517 if (!isspace(line[0]) && !strchr(line, ':'))
520 has_nuls = (linelen != strlen(line));
521 if (outlevel > O_SILENT)
523 GT_("incorrect header line found while scanning headers\n"));
524 goto process_headers;
527 /* check for RFC822 continuations */
528 set_timeout(mytimeout);
532 (ch == ' ' || ch == '\t'); /* continuation to next line? */
534 /* write the message size dots */
535 if ((outlevel > O_SILENT && outlevel < O_VERBOSE) && linelen > 0)
537 sizeticker += linelen;
538 while (sizeticker >= SIZETICKER)
540 if ((!run.use_syslog && !isafile(1)) || run.showdots)
545 sizeticker -= SIZETICKER;
549 /* we see an ordinary (non-header, non-message-delimiter line */
550 has_nuls = (linelen != strlen(line));
552 /* save the message's ID, we may use it for killing duplicates later */
553 if (MULTIDROP(ctl) && !strncasecmp(line, "Message-ID:", 11))
554 ctl->thisid = xstrdup(line);
557 * The University of Washington IMAP server (the reference
558 * implementation of IMAP4 written by Mark Crispin) relies
559 * on being able to keep base-UID information in a special
560 * message at the head of the mailbox. This message should
561 * neither be deleted nor forwarded.
565 * We disable this check under POP2 because there's no way to
566 * prevent deletion of the message. So at least we ought to
567 * forward it to the user so he or she will have some clue
568 * that things have gone awry.
571 if (strncmp(protocol->service, "pop2", 4))
572 #else /* INET6_ENABLE */
573 if (protocol->port != 109)
574 #endif /* INET6_ENABLE */
575 #endif /* POP2_ENABLE */
576 if (num == 1 && !strncasecmp(line, "X-IMAP:", 7)) {
583 * This code prevents fetchmail from becoming an accessory after
584 * the fact to upstream sendmails with the `E' option on. It also
585 * copes with certain brain-dead POP servers (like NT's) that pass
586 * through Unix from_ lines.
588 * Either of these bugs can result in a non-RFC822 line at the
589 * beginning of the headers. If fetchmail just passes it
590 * through, the client listener may think the message has *no*
591 * headers (since the first) line it sees doesn't look
592 * RFC822-conformant) and fake up a set.
594 * What the user would see in this case is bogus (synthesized)
595 * headers, followed by a blank line, followed by the >From,
596 * followed by the real headers, followed by a blank line,
599 * We forestall this lossage by tossing anything that looks
600 * like an escaped or passed-through From_ line in headers.
601 * These aren't RFC822 so our conscience is clear...
603 if (!strncasecmp(line, ">From ", 6) || !strncasecmp(line, "From ", 5))
610 * We remove all Delivered-To: headers.
612 * This is to avoid false mail loops messages when delivering
613 * local messages to and from a Postfix/qmail mailserver.
615 if (ctl->dropdelivered && !strncasecmp(line, "Delivered-To:", 13))
625 * If we see a Status line, it may have been inserted by an MUA
626 * on the mail host, or it may have been inserted by the server
627 * program after the headers in the transaction stream. This
628 * can actually hose some new-mail notifiers such as xbuffy,
629 * which assumes any Status line came from a *local* MDA and
630 * therefore indicates that the message has been seen.
632 * Some buggy POP servers (including at least the 3.3(20)
633 * version of the one distributed with IMAP) insert empty
634 * Status lines in the transaction stream; we'll chuck those
635 * unconditionally. Nonempty ones get chucked if the user
636 * turns on the dropstatus flag.
641 if (!strncasecmp(line, "Status:", 7))
643 else if (!strncasecmp(line, "X-Mozilla-Status:", 17))
648 while (*cp && isspace(*cp)) cp++;
649 if (!*cp || ctl->dropstatus)
658 line = reply_hack(line, ctl->server.truename);
661 * OK, this is messy. If we're forwarding by SMTP, it's the
662 * SMTP-receiver's job (according to RFC821, page 22, section
663 * 4.1.1) to generate a Return-Path line on final delivery.
664 * The trouble is, we've already got one because the
665 * mailserver's SMTP thought *it* was responsible for final
668 * Stash away the contents of Return-Path (as modified by reply_hack)
669 * for use in generating MAIL FROM later on, then prevent the header
670 * from being saved with the others. In effect, we strip it off here.
672 * If the SMTP server conforms to the standards, and fetchmail gets the
673 * envelope sender from the Return-Path, the new Return-Path should be
674 * exactly the same as the original one.
676 * We do *not* want to ignore empty Return-Path headers. These should
677 * be passed through as a way of indicating that a message should
678 * not trigger bounces if delivery fails. What we *do* need to do is
679 * make sure we never try to rewrite such a blank Return-Path. We
680 * handle this with a check for <> in the rewrite logic above.
682 * Also, if an email has multiple Return-Path: statement, we only
683 * read the first occurance, as some spam email has more than one
687 if ((already_has_return_path==FALSE) && !strncasecmp("Return-Path:", line, 12) && (cp = nxtaddr(line)))
689 already_has_return_path = TRUE;
690 strncpy(msgblk.return_path, cp, sizeof(msgblk.return_path));
691 msgblk.return_path[sizeof(msgblk.return_path)-1] = '\0';
700 oldlen = strlen(line);
701 msgblk.headers = xmalloc(oldlen + 1);
702 (void) strcpy(msgblk.headers, line);
704 line = msgblk.headers;
711 newlen = oldlen + strlen(line);
712 newhdrs = (char *) realloc(msgblk.headers, newlen + 1);
713 if (newhdrs == NULL) {
717 msgblk.headers = newhdrs;
718 strcpy(msgblk.headers + oldlen, line);
720 line = msgblk.headers + oldlen;
724 /* find offsets of various special headers */
725 if (!strncasecmp("From:", line, 5))
726 from_offs = (line - msgblk.headers);
727 else if (!strncasecmp("Reply-To:", line, 9))
728 reply_to_offs = (line - msgblk.headers);
729 else if (!strncasecmp("Resent-From:", line, 12))
730 resent_from_offs = (line - msgblk.headers);
731 else if (!strncasecmp("Apparently-From:", line, 16))
732 app_from_offs = (line - msgblk.headers);
734 * Netscape 4.7 puts "Sender: zap" in mail headers. Perverse...
736 * But a literal reading of RFC822 sec. 4.4.2 supports the idea
737 * that Sender: *doesn't* have to be a working email address.
739 * The definition of the Sender header in RFC822 says, in
740 * part, "The Sender mailbox specification includes a word
741 * sequence which must correspond to a specific agent (i.e., a
742 * human user or a computer program) rather than a standard
743 * address." That implies that the contents of the Sender
744 * field don't need to be a legal email address at all So
745 * ignore any Sender or Resent-Semnder lines unless they
748 * (RFC2822 says the condents of Sender must be a valid mailbox
749 * address, which is also what RFC822 4.4.4 implies.)
751 else if (!strncasecmp("Sender:", line, 7) && (strchr(line, '@') || strchr(line, '!')))
752 sender_offs = (line - msgblk.headers);
753 else if (!strncasecmp("Resent-Sender:", line, 14) && (strchr(line, '@') || strchr(line, '!')))
754 resent_sender_offs = (line - msgblk.headers);
757 else if (!strncasecmp("Message-Id:", line, 11))
759 if (ctl->server.uidl)
763 line[IDLEN+12] = 0; /* prevent stack overflow */
764 sscanf(line+12, "%s", id);
765 if (!str_find( &ctl->newsaved, num))
767 struct idlist *new = save_str(&ctl->newsaved,id,UID_SEEN);
768 new->val.status.num = num;
772 #endif /* __UNUSED__ */
774 /* if multidrop is on, gather addressee headers */
777 if (!strncasecmp("To:", line, 3)
778 || !strncasecmp("Cc:", line, 3)
779 || !strncasecmp("Bcc:", line, 4)
780 || !strncasecmp("Apparently-To:", line, 14))
782 *to_chainptr = xmalloc(sizeof(struct addrblk));
783 (*to_chainptr)->offset = (line - msgblk.headers);
784 to_chainptr = &(*to_chainptr)->next;
788 else if (!strncasecmp("Resent-To:", line, 10)
789 || !strncasecmp("Resent-Cc:", line, 10)
790 || !strncasecmp("Resent-Bcc:", line, 11))
792 *resent_to_chainptr = xmalloc(sizeof(struct addrblk));
793 (*resent_to_chainptr)->offset = (line - msgblk.headers);
794 resent_to_chainptr = &(*resent_to_chainptr)->next;
795 *resent_to_chainptr = NULL;
798 else if (ctl->server.envelope != STRING_DISABLED)
800 if (ctl->server.envelope
801 && strcasecmp(ctl->server.envelope, "Received"))
803 if (env_offs == -1 && !strncasecmp(ctl->server.envelope,
805 strlen(ctl->server.envelope)))
807 if (skipcount++ < ctl->server.envskip)
809 env_offs = (line - msgblk.headers);
812 else if (!received_for && !strncasecmp("Received:", line, 9))
814 if (skipcount++ < ctl->server.envskip)
816 received_for = parse_received(ctl, line);
826 free(msgblk.headers);
827 msgblk.headers = NULL;
831 * When mail delivered to a multidrop mailbox on the server is
832 * addressed to multiple people on the client machine, there will
833 * be one copy left in the box for each recipient. This is not a
834 * problem if we have the actual recipient address to dispatch on
835 * (e.g. because we've mined it out of sendmail trace headers, or
836 * a qmail Delivered-To line, or a declared sender envelope line).
838 * But if we're mining addressees out of the To/Cc/Bcc fields, and
839 * if the mail is addressed to N people, each recipient will
840 * get N copies. This is bad when N > 1.
842 * Foil this by suppressing all but one copy of a message with
843 * a given Message-ID. The accept_count test ensures that
844 * multiple pieces of email with the same Message-ID, each
845 * with a *single* addressee (the N == 1 case), won't be
848 * Note: This implementation only catches runs of successive
849 * messages with the same ID, but that should be good
850 * enough. A more general implementation would have to store
851 * ever-growing lists of seen message-IDs; in a long-running
852 * daemon this would turn into a memory leak even if the
853 * implementation were perfect.
855 * Don't mess with this code casually. It would be way too easy
856 * to break it in a way that blackholed mail. Better to pass
857 * the occasional duplicate than to do that...
859 if (!received_for && env_offs == -1 && !delivered_to)
861 if (ctl->lastid && ctl->thisid && !strcasecmp(ctl->lastid, ctl->thisid))
863 if (accept_count > 1)
870 ctl->lastid = ctl->thisid;
876 * Hack time. If the first line of the message was blank, with no headers
877 * (this happens occasionally due to bad gatewaying software) cons up
878 * a set of fake headers.
880 * If you modify the fake header template below, be sure you don't
881 * make either From or To address @-less, otherwise the reply_hack
882 * logic will do bad things.
884 if (msgblk.headers == (char *)NULL)
887 snprintf(buf, sizeof(buf),
890 #endif /* HAVE_SNPRINTF */
891 "From: FETCHMAIL-DAEMON\r\nTo: %s@%s\r\nSubject: Headerless mail from %s's mailbox on %s\r\n",
892 user, fetchmailhost, ctl->remotename, ctl->server.truename);
893 msgblk.headers = xstrdup(buf);
897 * We can now process message headers before reading the text.
898 * In fact we have to, as this will tell us where to forward to.
901 /* Check for MIME headers indicating possible 8-bit data */
902 ctl->mimemsg = MimeBodyType(msgblk.headers, ctl->mimedecode);
905 if (ctl->server.sdps && sdps_envfrom)
907 /* We have the real envelope return-path, stored out of band by
908 * SDPS - that's more accurate than any header is going to be.
910 strcpy(msgblk.return_path, sdps_envfrom);
913 #endif /* SDPS_ENABLE */
915 * If there is a Return-Path address on the message, this was
916 * almost certainly the MAIL FROM address given the originating
917 * sendmail. This is the best thing to use for logging the
918 * message origin (it sets up the right behavior for bounces and
919 * mailing lists). Otherwise, fall down to the next available
920 * envelope address (which is the most probable real sender).
921 * *** The order is important! ***
922 * This is especially useful when receiving mailing list
923 * messages in multidrop mode. if a local address doesn't
924 * exist, the bounce message won't be returned blindly to the
925 * author or to the list itself but rather to the list manager
926 * (ex: specified by "Sender:") which is much less annoying. This
927 * is true for most mailing list packages.
929 if( !msgblk.return_path[0] ){
931 if (resent_sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_sender_offs)));
932 else if (sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + sender_offs)));
933 else if (resent_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_from_offs)));
934 else if (from_offs >= 0 && (ap = nxtaddr(msgblk.headers + from_offs)));
935 else if (reply_to_offs >= 0 && (ap = nxtaddr(msgblk.headers + reply_to_offs)));
936 else if (app_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + app_from_offs)));
937 /* multi-line MAIL FROM addresses confuse SMTP terribly */
938 if (ap && !strchr(ap, '\n')) {
939 strncpy(msgblk.return_path, ap, sizeof(msgblk.return_path));
940 msgblk.return_path[sizeof(msgblk.return_path)-1] = '\0';
944 /* cons up a list of local recipients */
945 msgblk.recipients = (struct idlist *)NULL;
946 accept_count = reject_count = 0;
947 /* is this a multidrop box? */
951 if (ctl->server.sdps && sdps_envto)
953 /* We have the real envelope recipient, stored out of band by
954 * SDPS - that's more accurate than any header is going to be.
956 find_server_names(sdps_envto, ctl, &msgblk.recipients);
959 #endif /* SDPS_ENABLE */
960 if (env_offs > -1) /* We have the actual envelope addressee */
961 find_server_names(msgblk.headers + env_offs, ctl, &msgblk.recipients);
962 else if (delivered_to && ctl->server.envelope != STRING_DISABLED &&
963 ctl->server.envelope && !strcasecmp(ctl->server.envelope, "Delivered-To"))
965 find_server_names(delivered_to, ctl, &msgblk.recipients);
969 else if (received_for)
971 * We have the Received for addressee.
972 * It has to be a mailserver address, or we
973 * wouldn't have got here.
974 * We use find_server_names() to let local
975 * hostnames go through.
977 find_server_names(received_for, ctl, &msgblk.recipients);
981 * We haven't extracted the envelope address.
982 * So check all the "Resent-To" header addresses if
983 * they exist. If and only if they don't, consider
984 * the "To" addresses.
986 register struct addrblk *nextptr;
987 if (resent_to_addrchain) {
988 /* delete the "To" chain and substitute it
989 * with the "Resent-To" list
991 while (to_addrchain) {
992 nextptr = to_addrchain->next;
994 to_addrchain = nextptr;
996 to_addrchain = resent_to_addrchain;
997 resent_to_addrchain = NULL;
999 /* now look for remaining adresses */
1000 while (to_addrchain) {
1001 find_server_names(msgblk.headers+to_addrchain->offset, ctl, &msgblk.recipients);
1002 nextptr = to_addrchain->next;
1004 to_addrchain = nextptr;
1009 no_local_matches = TRUE;
1010 save_str(&msgblk.recipients, run.postmaster, XMIT_ACCEPT);
1011 if (outlevel >= O_DEBUG)
1013 GT_("no local matches, forwarding to %s\n"),
1017 else /* it's a single-drop box, use first localname */
1018 save_str(&msgblk.recipients, ctl->localnames->id, XMIT_ACCEPT);
1022 * Time to either address the message or decide we can't deliver it yet.
1024 if (ctl->errcount > olderrs) /* there were DNS errors above */
1026 if (outlevel >= O_DEBUG)
1028 GT_("forwarding and deletion suppressed due to DNS errors\n"));
1029 free(msgblk.headers);
1030 msgblk.headers = NULL;
1031 free_str_list(&msgblk.recipients);
1032 return(PS_TRANSIENT);
1036 /* set up stuffline() so we can deliver the message body through it */
1037 if ((n = open_sink(ctl, &msgblk,
1038 &good_addresses, &bad_addresses)) != PS_SUCCESS)
1040 free(msgblk.headers);
1041 msgblk.headers = NULL;
1042 free_str_list(&msgblk.recipients);
1049 * Some server/sendmail combinations cause problems when our
1050 * synthetic Received line is before the From header. Cope
1053 if ((rcv = strstr(msgblk.headers, "Received:")) == (char *)NULL)
1054 rcv = msgblk.headers;
1055 /* handle ">Received:" lines too */
1056 while (rcv > msgblk.headers && rcv[-1] != '\n')
1058 if (rcv > msgblk.headers)
1063 n = stuffline(ctl, msgblk.headers);
1066 if (!run.invisible && n != -1)
1068 /* utter any per-message Received information we need here */
1069 if (ctl->server.trueaddr) {
1070 #ifdef HAVE_SNPRINTF
1071 snprintf(buf, sizeof(buf),
1074 #endif /* HAVE_SNPRINTF */
1075 "Received: from %s [%u.%u.%u.%u]\r\n",
1076 ctl->server.truename,
1077 (unsigned char)ctl->server.trueaddr[0],
1078 (unsigned char)ctl->server.trueaddr[1],
1079 (unsigned char)ctl->server.trueaddr[2],
1080 (unsigned char)ctl->server.trueaddr[3]);
1082 #ifdef HAVE_SNPRINTF
1083 snprintf(buf, sizeof(buf),
1086 #endif /* HAVE_SNPRINTF */
1087 "Received: from %s\r\n", ctl->server.truename);
1089 n = stuffline(ctl, buf);
1093 * This header is technically invalid under RFC822.
1094 * POP3, IMAP, etc. are not legal mail-parameter values.
1096 #ifdef HAVE_SNPRINTF
1097 snprintf(buf, sizeof(buf),
1100 #endif /* HAVE_SNPRINTF */
1101 "\tby %s with %s (fetchmail-%s",
1105 if (ctl->tracepolls)
1107 sprintf(buf + strlen(buf), " polling %s account %s",
1108 ctl->server.pollname,
1111 #ifdef HAVE_SNPRINTF
1112 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), ")\r\n");
1114 strcat(buf, ")\r\n");
1115 #endif /* HAVE_SNPRINTF */
1116 n = stuffline(ctl, buf);
1120 if (good_addresses == 0)
1122 #ifdef HAVE_SNPRINTF
1123 snprintf(buf+1, sizeof(buf)-1,
1126 #endif /* HAVE_SNPRINTF */
1127 "for %s (by default); ",
1128 rcpt_address (ctl, run.postmaster, 0));
1130 else if (good_addresses == 1)
1132 for (idp = msgblk.recipients; idp; idp = idp->next)
1133 if (idp->val.status.mark == XMIT_ACCEPT)
1134 break; /* only report first address */
1135 #ifdef HAVE_SNPRINTF
1136 snprintf(buf+1, sizeof(buf)-1,
1139 #endif /* HAVE_SNPRINTF */
1140 "for %s", rcpt_address (ctl, idp->id, 1));
1141 sprintf(buf+strlen(buf), " (%s); ",
1142 MULTIDROP(ctl) ? "multi-drop" : "single-drop");
1147 #ifdef HAVE_SNPRINTF
1148 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "%s\r\n",
1151 strcat(buf, rfc822timestamp());
1152 strcat(buf, "\r\n");
1153 #endif /* HAVE_SNPRINTF */
1154 n = stuffline(ctl, buf);
1160 n = stuffline(ctl, rcv); /* ship out rest of msgblk.headers */
1164 report(stdout, GT_("writing RFC822 msgblk.headers\n"));
1166 free(msgblk.headers);
1167 msgblk.headers = NULL;
1168 free_str_list(&msgblk.recipients);
1171 else if ((run.poll_interval == 0 || nodetach) && outlevel >= O_VERBOSE && !isafile(2))
1174 /* write error notifications */
1175 if (no_local_matches || has_nuls || bad_addresses)
1178 char errhd[USERNAMELEN + POPBUFSIZE], *errmsg;
1181 (void) strcpy(errhd, "X-Fetchmail-Warning: ");
1182 if (no_local_matches)
1184 if (reject_count != 1)
1185 strcat(errhd, GT_("no recipient addresses matched declared local names"));
1188 for (idp = msgblk.recipients; idp; idp = idp->next)
1189 if (idp->val.status.mark == XMIT_REJECT)
1191 #ifdef HAVE_SNPRINTF
1192 snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd),
1194 sprintf(errhd+strlen(errhd),
1195 #endif /* HAVE_SNPRINTF */
1196 GT_("recipient address %s didn't match any local name"), idp->id);
1202 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1203 #ifdef HAVE_SNPRINTF
1204 snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd), "; ");
1205 snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd),
1207 strcat(errhd, "; ");
1209 #endif /* HAVE_SNPRINTF */
1210 GT_("message has embedded NULs"));
1215 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1216 #ifdef HAVE_SNPRINTF
1217 snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd), "; ");
1218 snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd),
1220 strcat(errhd, "; ");
1222 #endif /* HAVE_SNPRINTF */
1223 GT_("SMTP listener rejected local recipient addresses: "));
1224 errlen = strlen(errhd);
1225 for (idp = msgblk.recipients; idp; idp = idp->next)
1226 if (idp->val.status.mark == XMIT_RCPTBAD)
1227 errlen += strlen(idp->id) + 2;
1229 xalloca(errmsg, char *, errlen+3);
1230 (void) strcpy(errmsg, errhd);
1231 for (idp = msgblk.recipients; idp; idp = idp->next)
1232 if (idp->val.status.mark == XMIT_RCPTBAD)
1234 strcat(errmsg, idp->id);
1236 strcat(errmsg, ", ");
1241 strcat(errmsg, "\r\n");
1243 /* ship out the error line */
1244 stuffline(ctl, errmsg);
1247 /* issue the delimiter line */
1252 stuffline(ctl, buf);
1256 if (outlevel > O_SILENT)
1258 GT_("message delimiter found while scanning headers\n"));
1259 return(PS_TRUNCATED);
1265 int readbody(int sock, struct query *ctl, flag forward, int len)
1266 /* read and dispose of a message body presented on sock */
1267 /* ctl: query control record */
1268 /* sock: to which the server is connected */
1269 /* len: length of message */
1270 /* forward: TRUE to forward */
1273 unsigned char buf[MSGBUFSIZE+4];
1274 unsigned char *inbufp = buf;
1275 flag issoftline = FALSE;
1278 * Pass through the text lines in the body.
1280 * Yes, this wants to be ||, not &&. The problem is that in the most
1281 * important delimited protocol, POP3, the length is not reliable.
1282 * As usual, the problem is Microsoft brain damage; see FAQ item S2.
1283 * So, for delimited protocols we need to ignore the length here and
1284 * instead drop out of the loop with a break statement when we see
1285 * the message delimiter.
1287 while (protocol->delimited || len > 0)
1289 set_timeout(mytimeout);
1290 if ((linelen = SockRead(sock, inbufp, sizeof(buf)-4-(inbufp-buf)))==-1)
1298 /* write the message size dots */
1301 sizeticker += linelen;
1302 while (sizeticker >= SIZETICKER)
1304 if (outlevel > O_SILENT && (((run.poll_interval == 0 || nodetach) && !isafile(1)) || run.showdots))
1309 sizeticker -= SIZETICKER;
1314 /* check for end of message */
1315 if (protocol->delimited && *inbufp == '.')
1317 if (EMPTYLINE(inbufp+1))
1320 msgblk.msglen--; /* subtract the size of the dot escape */
1323 msgblk.msglen += linelen;
1325 if (ctl->mimedecode && (ctl->mimemsg & MSG_NEEDS_DECODE)) {
1326 issoftline = UnMimeBodyline(&inbufp, protocol->delimited, issoftline);
1327 if (issoftline && (sizeof(buf)-1-(inbufp-buf) < 200))
1330 * Soft linebreak, but less than 200 bytes left in
1331 * input buffer. Rather than doing a buffer overrun,
1332 * ignore the soft linebreak, NL-terminate data and
1333 * deliver what we have now.
1334 * (Who writes lines longer than 2K anyway?)
1336 *inbufp = '\n'; *(inbufp+1) = '\0';
1341 /* ship out the text line */
1342 if (forward && (!issoftline))
1347 /* guard against very long lines */
1348 buf[MSGBUFSIZE+1] = '\r';
1349 buf[MSGBUFSIZE+2] = '\n';
1350 buf[MSGBUFSIZE+3] = '\0';
1352 n = stuffline(ctl, buf);
1356 report(stdout, GT_("writing message text\n"));
1360 else if (outlevel >= O_VERBOSE && !isafile(1))
1371 void init_transact(const struct method *proto)
1372 /* initialize state for the send and receive functions */
1375 tag[0] = '\0'; /* nuke any tag hanging out from previous query */
1376 protocol = (struct method *)proto;
1379 static void enshroud(char *buf)
1380 /* shroud a password in the given buffer */
1384 if (shroud[0] && (cp = strstr(buf, shroud)))
1388 sp = cp + strlen(shroud);
1396 #if defined(HAVE_STDARG_H)
1397 void gen_send(int sock, const char *fmt, ... )
1399 void gen_send(sock, fmt, va_alist)
1400 int sock; /* socket to which server is connected */
1401 const char *fmt; /* printf-style format */
1404 /* assemble command in printf(3) style and send to the server */
1406 char buf [MSGBUFSIZE+1];
1409 if (protocol->tagged && !suppress_tags)
1410 (void) sprintf(buf, "%s ", GENSYM);
1414 #if defined(HAVE_STDARG_H)
1419 #ifdef HAVE_VSNPRINTF
1420 vsnprintf(buf + strlen(buf), sizeof(buf)-strlen(buf), fmt, ap);
1422 vsprintf(buf + strlen(buf), fmt, ap);
1426 #ifdef HAVE_SNPRINTF
1427 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1429 strcat(buf, "\r\n");
1430 #endif /* HAVE_SNPRINTF */
1431 SockWrite(sock, buf, strlen(buf));
1433 if (outlevel >= O_MONITOR)
1436 buf[strlen(buf)-2] = '\0';
1437 report(stdout, "%s> %s\n", protocol->name, buf);
1441 int gen_recv(sock, buf, size)
1442 /* get one line of input from the server */
1443 int sock; /* socket to which server is connected */
1444 char *buf; /* buffer to receive input */
1445 int size; /* length of buffer */
1447 int oldphase = phase; /* we don't have to be re-entrant */
1449 phase = SERVER_WAIT;
1450 set_timeout(mytimeout);
1451 if (SockRead(sock, buf, size) == -1)
1456 return(PS_IDLETIMEOUT);
1463 if (buf[strlen(buf)-1] == '\n')
1464 buf[strlen(buf)-1] = '\0';
1465 if (buf[strlen(buf)-1] == '\r')
1466 buf[strlen(buf)-1] = '\0';
1467 if (outlevel >= O_MONITOR)
1468 report(stdout, "%s< %s\n", protocol->name, buf);
1474 #if defined(HAVE_STDARG_H)
1475 int gen_transact(int sock, const char *fmt, ... )
1477 int gen_transact(int sock, fmt, va_alist)
1478 int sock; /* socket to which server is connected */
1479 const char *fmt; /* printf-style format */
1482 /* assemble command in printf(3) style, send to server, accept a response */
1485 char buf [MSGBUFSIZE+1];
1487 int oldphase = phase; /* we don't have to be re-entrant */
1489 phase = SERVER_WAIT;
1491 if (protocol->tagged && !suppress_tags)
1492 (void) sprintf(buf, "%s ", GENSYM);
1496 #if defined(HAVE_STDARG_H)
1501 #ifdef HAVE_VSNPRINTF
1502 vsnprintf(buf + strlen(buf), sizeof(buf)-strlen(buf), fmt, ap);
1504 vsprintf(buf + strlen(buf), fmt, ap);
1508 #ifdef HAVE_SNPRINTF
1509 snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
1511 strcat(buf, "\r\n");
1512 #endif /* HAVE_SNPRINTF */
1513 SockWrite(sock, buf, strlen(buf));
1515 if (outlevel >= O_MONITOR)
1518 buf[strlen(buf)-2] = '\0';
1519 report(stdout, "%s> %s\n", protocol->name, buf);
1522 /* we presume this does its own response echoing */
1523 ok = (protocol->parse_response)(sock, buf);
1529 /* transact.c ends here */