2 * driver.c -- generic driver for mail fetch method protocols
4 * Copyright 1997 by Eric S. Raymond
5 * For license terms, see the file COPYING in this directory.
16 #endif /* HAVE_MEMORY_H */
17 #if defined(STDC_HEADERS)
20 #if defined(HAVE_UNISTD_H)
23 #if defined(HAVE_STDARG_H)
28 #if defined(HAVE_SYS_ITIMER_H)
29 #include <sys/itimer.h>
34 #ifdef HAVE_NET_SOCKET_H
35 #include <net/socket.h>
38 #ifdef HAVE_RES_SEARCH
41 #endif /* HAVE_RES_SEARCH */
45 #include <kerberosIV/des.h>
46 #include <kerberosIV/krb.h>
48 #if defined (__bsdi__)
49 #include <des.h> /* order of includes matters */
51 #define krb_get_err_text(e) (krb_err_txt[e])
53 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__)
54 #define krb_get_err_text(e) (krb_err_txt[e])
60 #endif /* ! defined (__FreeBSD__) */
61 #endif /* ! defined (__bsdi__) */
62 #endif /* KERBEROS_V5 */
63 #include <netinet/in.h>
65 #endif /* KERBEROS_V4 */
69 #endif /* KERBEROS_V5 */
73 #include "fetchmail.h"
76 /* throw types for runtime errors */
77 #define THROW_TIMEOUT 1 /* server timed out */
78 #define THROW_SIGPIPE 2 /* SIGPIPE on stream socket */
80 #ifndef strstr /* glibc-2.1 declares this as a macro */
81 extern char *strstr(); /* needed on sysV68 R3V7.1. */
84 int batchcount; /* count of messages sent in current batch */
85 flag peek_capable; /* can we peek for better error recovery? */
86 int pass; /* how many times have we re-polled? */
87 int stage; /* where are we? */
88 int phase; /* where are we, for error-logging purposes? */
89 int mytimeout; /* value of nonreponse timeout */
91 static const struct method *protocol;
92 static jmp_buf restart;
96 #define GENSYM (sprintf(tag, "A%04d", ++tagnum % TAGMOD), tag)
98 static char shroud[PASSWORDLEN]; /* string to shroud in debug output */
99 static int timeoutcount; /* count consecutive timeouts */
100 static int msglen; /* actual message length */
102 void set_timeout(int timeleft)
103 /* reset the nonresponse-timeout */
105 #if !defined(__EMX__) && !defined(__BEOS__)
106 struct itimerval ntimeout;
111 ntimeout.it_interval.tv_sec = ntimeout.it_interval.tv_usec = 0;
112 ntimeout.it_value.tv_sec = timeleft;
113 ntimeout.it_value.tv_usec = 0;
114 setitimer(ITIMER_REAL, &ntimeout, (struct itimerval *)NULL);
118 static void timeout_handler (int signal)
119 /* handle SIGALRM signal indicating a server timeout */
122 longjmp(restart, THROW_TIMEOUT);
125 static void sigpipe_handler (int signal)
126 /* handle SIGPIPE signal indicating a broken stream socket */
128 longjmp(restart, THROW_SIGPIPE);
131 static int accept_count, reject_count;
133 static void map_name(const char *name, struct query *ctl, struct idlist **xmit_names)
134 /* add given name to xmit_names if it matches declared localnames */
135 /* name: name to map */
136 /* ctl: list of permissible aliases */
137 /* xmit_names: list of recipient names parsed out */
142 lname = idpair_find(&ctl->localnames, name+off);
143 if (!lname && ctl->wildcard)
146 if (lname != (char *)NULL)
148 if (outlevel >= O_DEBUG)
149 report(stdout, _("mapped %s to local %s\n"), name, lname);
150 save_str(xmit_names, lname, XMIT_ACCEPT);
155 static void find_server_names(const char *hdr,
157 struct idlist **xmit_names)
158 /* parse names out of a RFC822 header into an ID list */
159 /* hdr: RFC822 header in question */
160 /* ctl: list of permissible aliases */
161 /* xmit_names: list of recipient names parsed out */
163 if (hdr == (char *)NULL)
169 for (cp = nxtaddr(hdr);
176 * If the name of the user begins with a qmail virtual
177 * domain prefix, ignore the prefix. Doing this here
178 * means qvirtual will work either with ordinary name
179 * mapping or with a localdomains option.
181 if (ctl->server.qvirtual)
183 int sl = strlen(ctl->server.qvirtual);
185 if (!strncasecmp(cp, ctl->server.qvirtual, sl))
189 if ((atsign = strchr(cp, '@'))) {
193 * Does a trailing segment of the hostname match something
194 * on the localdomains list? If so, save the whole name
197 for (idp = ctl->server.localdomains; idp; idp = idp->next) {
200 rhs = atsign + (strlen(atsign) - strlen(idp->id));
202 (rhs[-1] == '.' || rhs[-1] == '@') &&
203 strcasecmp(rhs, idp->id) == 0)
205 if (outlevel >= O_DEBUG)
206 report(stdout, _("passed through %s matching %s\n"),
208 save_str(xmit_names, cp, XMIT_ACCEPT);
214 /* if we matched a local domain, idp != NULL */
218 * Check to see if the right-hand part is an alias
219 * or MX equivalent of the mailserver. If it's
220 * not, skip this name. If it is, we'll keep
221 * going and try to find a mapping to a client name.
223 if (!is_host_alias(atsign+1, ctl))
225 save_str(xmit_names, cp, XMIT_REJECT);
231 map_name(cp, ctl, xmit_names);
239 * Return zero on a syntactically invalid address, nz on a valid one.
241 * This used to be strchr(a, '.'), but it turns out that lines like this
243 * Received: from punt-1.mail.demon.net by mailstore for markb@ordern.com
244 * id 938765929:10:27223:2; Fri, 01 Oct 99 08:18:49 GMT
246 * are not uncommon. So now we just check that the following token is
247 * not itself an email address.
249 #define VALID_ADDRESS(a) !strchr(a, '@')
251 static char *parse_received(struct query *ctl, char *bufp)
252 /* try to extract real address from the Received line */
253 /* If a valid Received: line is found, we return the full address in
254 * a buffer which can be parsed from nxtaddr(). This is to ansure that
255 * the local domain part of the address can be passed along in
256 * find_server_names() if it contains one.
257 * Note: We should return a dummy header containing the address
258 * which makes nxtaddr() behave correctly.
261 char *base, *ok = (char *)NULL;
262 static char rbuf[HOSTLEN + USERNAMELEN + 4];
265 * Try to extract the real envelope addressee. We look here
266 * specifically for the mailserver's Received line.
267 * Note: this will only work for sendmail, or an MTA that
268 * shares sendmail's convention for embedding the envelope
269 * address in the Received line. Sendmail itself only
270 * does this when the mail has a single recipient.
272 if (outlevel >= O_DEBUG)
273 report(stdout, _("analyzing Received line:\n%s"), bufp);
275 /* search for whitepace-surrounded "by" followed by valid address */
276 for (base = bufp; ; base = ok + 2)
278 if (!(ok = strstr(base, "by")))
280 else if (!isspace(ok[-1]) || !isspace(ok[2]))
286 /* extract space-delimited token after "by" */
287 for (sp = ok + 2; isspace(*sp); sp++)
290 for (; !isspace(*sp); sp++)
294 /* look for valid address */
295 if (VALID_ADDRESS(rbuf))
298 ok = sp - 1; /* arrange to skip this token */
304 * If it's a DNS name of the mail server, look for the
305 * recipient name after a following "for". Otherwise
308 if (is_host_alias(rbuf, ctl))
310 if (outlevel >= O_DEBUG)
312 _("line accepted, %s is an alias of the mailserver\n"), rbuf);
316 if (outlevel >= O_DEBUG)
318 _("line rejected, %s is not an alias of the mailserver\n"),
323 /* search for whitepace-surrounded "for" followed by xxxx@yyyy */
324 for (base = ok + 4 + strlen(rbuf); ; base = ok + 2)
326 if (!(ok = strstr(base, "for")))
328 else if (!isspace(ok[-1]) || !isspace(ok[3]))
334 /* extract space-delimited token after "for" */
335 for (sp = ok + 3; isspace(*sp); sp++)
338 for (; !isspace(*sp); sp++)
342 if (strchr(rbuf, '@'))
345 ok = sp - 1; /* arrange to skip this token */
350 flag want_gt = FALSE;
353 /* char after "for" could be space or a continuation newline */
354 for (sp = ok + 4; isspace(*sp); sp++)
357 *tp++ = ':'; /* Here is the hack. This is to be friends */
358 *tp++ = ' '; /* with nxtaddr()... */
364 while (*sp == '@') /* skip routes */
365 while (*sp && *sp++ != ':')
368 && (want_gt ? (*sp != '>') : !isspace(*sp))
374 /* uh oh -- whitespace here can't be right! */
380 if (strlen(rbuf) <= 3) /* apparently nothing has been found */
388 if (outlevel >= O_DEBUG)
389 report(stdout, _("no Received address found\n"));
394 if (outlevel >= O_DEBUG) {
395 char *lf = rbuf + strlen(rbuf)-1;
397 if (outlevel >= O_DEBUG)
398 report(stdout, _("found Received address `%s'\n"), rbuf+2);
405 /* shared by readheaders and readbody */
406 static int sizeticker;
407 static struct msgblk msgblk;
409 #define EMPTYLINE(s) ((s)[0] == '\r' && (s)[1] == '\n' && (s)[2] == '\0')
411 static int readheaders(int sock,
416 /* read message headers and ship to SMTP or MDA */
417 /* sock: to which the server is connected */
418 /* fetchlen: length of message according to fetch response */
419 /* reallen: length of message according to getsizes */
420 /* ctl: query control record */
421 /* num: index of message */
426 struct addrblk *next;
428 struct addrblk *to_addrchain = NULL;
429 struct addrblk **to_chainptr = &to_addrchain;
430 struct addrblk *resent_to_addrchain = NULL;
431 struct addrblk **resent_to_chainptr = &resent_to_addrchain;
433 char buf[MSGBUFSIZE+1];
434 int from_offs, reply_to_offs, resent_from_offs;
435 int app_from_offs, sender_offs, resent_sender_offs;
437 char *received_for, *rcv, *cp;
438 int n, linelen, oldlen, ch, remaining, skipcount;
440 flag no_local_matches = FALSE;
441 flag headers_ok, has_nuls;
442 int olderrs, good_addresses, bad_addresses;
445 has_nuls = headers_ok = FALSE;
446 msgblk.return_path[0] = '\0';
447 olderrs = ctl->errcount;
449 /* read message headers */
450 msgblk.reallen = reallen;
451 msgblk.headers = received_for = NULL;
452 from_offs = reply_to_offs = resent_from_offs = app_from_offs =
453 sender_offs = resent_sender_offs = env_offs = -1;
459 for (remaining = fetchlen; remaining > 0 || protocol->delimited; remaining -= linelen)
463 line = xmalloc(sizeof(buf));
467 set_timeout(mytimeout);
468 if ((n = SockRead(sock, buf, sizeof(buf)-1)) == -1) {
471 free(msgblk.headers);
478 /* lines may not be properly CRLF terminated; fix this for qmail */
481 cp = buf + strlen(buf) - 1;
482 if (*cp == '\n' && (cp == buf || cp[-1] != '\r'))
491 * Decode MIME encoded headers. We MUST do this before
492 * looking at the Content-Type / Content-Transfer-Encoding
493 * headers (RFC 2046).
498 line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
502 /* check for end of headers */
506 has_nuls = (linelen != strlen(line));
508 goto process_headers;
512 * Check for end of message immediately. If one of your folders
513 * has been mangled, the delimiter may occur directly after the
516 if (protocol->delimited && line[0] == '.' && EMPTYLINE(line+1))
519 has_nuls = (linelen != strlen(line));
520 goto process_headers;
523 /* check for RFC822 continuations */
524 set_timeout(mytimeout);
528 (ch == ' ' || ch == '\t'); /* continuation to next line? */
530 /* write the message size dots */
531 if ((outlevel > O_SILENT && outlevel < O_VERBOSE) && linelen > 0)
533 sizeticker += linelen;
534 while (sizeticker >= SIZETICKER)
536 if (!run.use_syslog && !isafile(1))
541 sizeticker -= SIZETICKER;
545 /* we see an ordinary (non-header, non-message-delimiter line */
546 has_nuls = (linelen != strlen(line));
549 * When mail delivered to a multidrop mailbox on the server is
550 * addressed to multiple people on the client machine, there
551 * will be one copy left in the box for each recipient. Thus,
552 * if the mail is addressed to N people, each recipient will
555 * Foil this by suppressing all but one copy of a message with
556 * a given Message-ID. Note: This implementation only catches
557 * runs of successive identical messages, but that should be
560 * The accept_count test ensures that multiple pieces of identical
561 * email, each with a *single* addressee, won't be suppressed.
563 if (MULTIDROP(ctl) && accept_count > 1 && !strncasecmp(line, "Message-ID:", 11))
565 if (ctl->lastid && !strcasecmp(ctl->lastid, line))
571 ctl->lastid = strdup(line);
576 * The University of Washington IMAP server (the reference
577 * implementation of IMAP4 written by Mark Crispin) relies
578 * on being able to keep base-UID information in a special
579 * message at the head of the mailbox. This message should
580 * neither be deleted nor forwarded.
584 * We disable this check under POP2 because there's no way to
585 * prevent deletion of the message. So at least we ought to
586 * forward it to the user so he or she will have some clue
587 * that things have gone awry.
590 if (strncmp(protocol->service, "pop2", 4))
591 #else /* INET6_ENABLE */
592 if (protocol->port != 109)
593 #endif /* INET6_ENABLE */
594 #endif /* POP2_ENABLE */
595 if (num == 1 && !strncasecmp(line, "X-IMAP:", 7)) {
597 free(msgblk.headers);
602 * This code prevents fetchmail from becoming an accessory after
603 * the fact to upstream sendmails with the `E' option on. It also
604 * copes with certain brain-dead POP servers (like NT's) that pass
605 * through Unix from_ lines.
607 * Either of these bugs can result in a non-RFC822 line at the
608 * beginning of the headers. If fetchmail just passes it
609 * through, the client listener may think the message has *no*
610 * headers (since the first) line it sees doesn't look
611 * RFC822-conformant) and fake up a set.
613 * What the user would see in this case is bogus (synthesized)
614 * headers, followed by a blank line, followed by the >From,
615 * followed by the real headers, followed by a blank line,
618 * We forestall this lossage by tossing anything that looks
619 * like an escaped or passed-through From_ line in headers.
620 * These aren't RFC822 so our conscience is clear...
622 if (!strncasecmp(line, ">From ", 6) || !strncasecmp(line, "From ", 5))
629 * If we see a Status line, it may have been inserted by an MUA
630 * on the mail host, or it may have been inserted by the server
631 * program after the headers in the transaction stream. This
632 * can actually hose some new-mail notifiers such as xbuffy,
633 * which assumes any Status line came from a *local* MDA and
634 * therefore indicates that the message has been seen.
636 * Some buggy POP servers (including at least the 3.3(20)
637 * version of the one distributed with IMAP) insert empty
638 * Status lines in the transaction stream; we'll chuck those
639 * unconditionally. Nonempty ones get chucked if the user
640 * turns on the dropstatus flag.
645 if (!strncasecmp(line, "Status:", 7))
647 else if (!strncasecmp(line, "X-Mozilla-Status:", 17))
652 while (*cp && isspace(*cp)) cp++;
653 if (!*cp || ctl->dropstatus)
662 line = reply_hack(line, ctl->server.truename);
665 * OK, this is messy. If we're forwarding by SMTP, it's the
666 * SMTP-receiver's job (according to RFC821, page 22, section
667 * 4.1.1) to generate a Return-Path line on final delivery.
668 * The trouble is, we've already got one because the
669 * mailserver's SMTP thought *it* was responsible for final
672 * Stash away the contents of Return-Path (as modified by reply_hack)
673 * for use in generating MAIL FROM later on, then prevent the header
674 * from being saved with the others. In effect, we strip it off here.
676 * If the SMTP server conforms to the standards, and fetchmail gets the
677 * envelope sender from the Return-Path, the new Return-Path should be
678 * exactly the same as the original one.
680 * We do *not* want to ignore empty Return-Path headers. These should
681 * be passed through as a way of indicating that a message should
682 * not trigger bounces if delivery fails. What we *do* need to do is
683 * make sure we never try to rewrite such a blank Return-Path. We
684 * handle this with a check for <> in the rewrite logic above.
686 if (!strncasecmp("Return-Path:", line, 12) && (cp = nxtaddr(line)))
688 strcpy(msgblk.return_path, cp);
697 oldlen = strlen(line);
698 msgblk.headers = xmalloc(oldlen + 1);
699 (void) strcpy(msgblk.headers, line);
701 line = msgblk.headers;
707 newlen = oldlen + strlen(line);
708 msgblk.headers = (char *) realloc(msgblk.headers, newlen + 1);
709 if (msgblk.headers == NULL) {
713 strcpy(msgblk.headers + oldlen, line);
715 line = msgblk.headers + oldlen;
719 if (!strncasecmp("From:", line, 5))
720 from_offs = (line - msgblk.headers);
721 else if (!strncasecmp("Reply-To:", line, 9))
722 reply_to_offs = (line - msgblk.headers);
723 else if (!strncasecmp("Resent-From:", line, 12))
724 resent_from_offs = (line - msgblk.headers);
725 else if (!strncasecmp("Apparently-From:", line, 16))
726 app_from_offs = (line - msgblk.headers);
727 else if (!strncasecmp("Sender:", line, 7))
728 sender_offs = (line - msgblk.headers);
729 else if (!strncasecmp("Resent-Sender:", line, 14))
730 resent_sender_offs = (line - msgblk.headers);
733 else if (!strncasecmp("Message-Id:", line, 11))
735 if (ctl->server.uidl)
739 line[IDLEN+12] = 0; /* prevent stack overflow */
740 sscanf(line+12, "%s", id);
741 if (!str_find( &ctl->newsaved, num))
743 struct idlist *new = save_str(&ctl->newsaved,id,UID_SEEN);
744 new->val.status.num = num;
748 #endif /* __UNUSED__ */
750 else if (!MULTIDROP(ctl))
753 else if (!strncasecmp("To:", line, 3)
754 || !strncasecmp("Cc:", line, 3)
755 || !strncasecmp("Bcc:", line, 4)
756 || !strncasecmp("Apparently-To:", line, 14))
758 *to_chainptr = xmalloc(sizeof(struct addrblk));
759 (*to_chainptr)->offset = (line - msgblk.headers);
760 to_chainptr = &(*to_chainptr)->next;
764 else if (!strncasecmp("Resent-To:", line, 10)
765 || !strncasecmp("Resent-Cc:", line, 10)
766 || !strncasecmp("Resent-Bcc:", line, 11))
768 *resent_to_chainptr = xmalloc(sizeof(struct addrblk));
769 (*resent_to_chainptr)->offset = (line - msgblk.headers);
770 resent_to_chainptr = &(*resent_to_chainptr)->next;
771 *resent_to_chainptr = NULL;
774 else if (ctl->server.envelope != STRING_DISABLED)
776 if (ctl->server.envelope
777 && strcasecmp(ctl->server.envelope, "Received"))
779 if (env_offs == -1 && !strncasecmp(ctl->server.envelope,
781 strlen(ctl->server.envelope)))
783 if (skipcount++ != ctl->server.envskip)
785 env_offs = (line - msgblk.headers);
788 else if (!received_for && !strncasecmp("Received:", line, 9))
790 if (skipcount++ != ctl->server.envskip)
792 received_for = parse_received(ctl, line);
799 * We want to detect this early in case there are so few headers that the
800 * dispatch logic barfs.
804 if (outlevel > O_SILENT)
806 _("message delimiter found while scanning headers\n"));
810 * Hack time. If the first line of the message was blank, with no headers
811 * (this happens occasionally due to bad gatewaying software) cons up
812 * a set of fake headers.
814 * If you modify the fake header template below, be sure you don't
815 * make either From or To address @-less, otherwise the reply_hack
816 * logic will do bad things.
818 if (msgblk.headers == (char *)NULL)
821 snprintf(buf, sizeof(buf),
824 #endif /* HAVE_SNPRINTF */
825 "From: FETCHMAIL-DAEMON\r\nTo: %s@%s\r\nSubject: Headerless mail from %s's mailbox on %s\r\n",
826 user, fetchmailhost, ctl->remotename, ctl->server.truename);
827 msgblk.headers = xstrdup(buf);
831 * We can now process message headers before reading the text.
832 * In fact we have to, as this will tell us where to forward to.
835 /* Check for MIME headers indicating possible 8-bit data */
836 ctl->mimemsg = MimeBodyType(msgblk.headers, ctl->mimedecode);
839 if (ctl->server.sdps && sdps_envfrom)
841 /* We have the real envelope return-path, stored out of band by
842 * SDPS - that's more accurate than any header is going to be.
844 strcpy(msgblk.return_path, sdps_envfrom);
847 #endif /* SDPS_ENABLE */
849 * If there is a Return-Path address on the message, this was
850 * almost certainly the MAIL FROM address given the originating
851 * sendmail. This is the best thing to use for logging the
852 * message origin (it sets up the right behavior for bounces and
853 * mailing lists). Otherwise, fall down to the next available
854 * envelope address (which is the most probable real sender).
855 * *** The order is important! ***
856 * This is especially useful when receiving mailing list
857 * messages in multidrop mode. if a local address doesn't
858 * exist, the bounce message won't be returned blindly to the
859 * author or to the list itself but rather to the list manager
860 * (ex: specified by "Sender:") which is much less annoying. This
861 * is true for most mailing list packages.
863 if( !msgblk.return_path[0] ){
865 if (resent_sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_sender_offs)));
866 else if (sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + sender_offs)));
867 else if (resent_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_from_offs)));
868 else if (from_offs >= 0 && (ap = nxtaddr(msgblk.headers + from_offs)));
869 else if (reply_to_offs >= 0 && (ap = nxtaddr(msgblk.headers + reply_to_offs)));
870 else if (app_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + app_from_offs)));
871 if (ap) strcpy( msgblk.return_path, ap );
874 /* cons up a list of local recipients */
875 msgblk.recipients = (struct idlist *)NULL;
876 accept_count = reject_count = 0;
877 /* is this a multidrop box? */
881 if (ctl->server.sdps && sdps_envto)
883 /* We have the real envelope recipient, stored out of band by
884 * SDPS - that's more accurate than any header is going to be.
886 find_server_names(sdps_envto, ctl, &msgblk.recipients);
889 #endif /* SDPS_ENABLE */
890 if (env_offs > -1) /* We have the actual envelope addressee */
891 find_server_names(msgblk.headers + env_offs, ctl, &msgblk.recipients);
892 else if (received_for)
894 * We have the Received for addressee.
895 * It has to be a mailserver address, or we
896 * wouldn't have got here.
897 * We use find_server_names() to let local
898 * hostnames go through.
900 find_server_names(received_for, ctl, &msgblk.recipients);
904 * We haven't extracted the envelope address.
905 * So check all the "Resent-To" header addresses if
906 * they exist. If and only if they don't, consider
907 * the "To" addresses.
909 register struct addrblk *nextptr;
910 if (resent_to_addrchain) {
911 /* delete the "To" chain and substitute it
912 * with the "Resent-To" list
914 while (to_addrchain) {
915 nextptr = to_addrchain->next;
917 to_addrchain = nextptr;
919 to_addrchain = resent_to_addrchain;
920 resent_to_addrchain = NULL;
922 /* now look for remaining adresses */
923 while (to_addrchain) {
924 find_server_names(msgblk.headers+to_addrchain->offset, ctl, &msgblk.recipients);
925 nextptr = to_addrchain->next;
927 to_addrchain = nextptr;
932 no_local_matches = TRUE;
933 save_str(&msgblk.recipients, run.postmaster, XMIT_ACCEPT);
934 if (outlevel >= O_DEBUG)
936 _("no local matches, forwarding to %s\n"),
940 else /* it's a single-drop box, use first localname */
941 save_str(&msgblk.recipients, ctl->localnames->id, XMIT_ACCEPT);
945 * Time to either address the message or decide we can't deliver it yet.
947 if (ctl->errcount > olderrs) /* there were DNS errors above */
949 if (outlevel >= O_DEBUG)
951 _("forwarding and deletion suppressed due to DNS errors\n"));
952 free(msgblk.headers);
953 free_str_list(&msgblk.recipients);
954 return(PS_TRANSIENT);
958 /* set up stuffline() so we can deliver the message body through it */
959 if ((n = open_sink(ctl, &msgblk,
960 &good_addresses, &bad_addresses)) != PS_SUCCESS)
962 free(msgblk.headers);
963 free_str_list(&msgblk.recipients);
970 * Some server/sendmail combinations cause problems when our
971 * synthetic Received line is before the From header. Cope
974 if ((rcv = strstr(msgblk.headers, "Received:")) == (char *)NULL)
975 rcv = msgblk.headers;
976 /* handle ">Received:" lines too */
977 while (rcv > msgblk.headers && rcv[-1] != '\n')
979 if (rcv > msgblk.headers)
984 n = stuffline(ctl, msgblk.headers);
987 if (!run.invisible && n != -1)
989 /* utter any per-message Received information we need here */
990 if (ctl->server.trueaddr) {
991 sprintf(buf, "Received: from %s [%u.%u.%u.%u]\r\n",
992 ctl->server.truename,
993 (unsigned char)ctl->server.trueaddr[0],
994 (unsigned char)ctl->server.trueaddr[1],
995 (unsigned char)ctl->server.trueaddr[2],
996 (unsigned char)ctl->server.trueaddr[3]);
998 sprintf(buf, "Received: from %s\r\n", ctl->server.truename);
1000 n = stuffline(ctl, buf);
1004 * This header is technically invalid under RFC822.
1005 * POP3, IMAP, etc. are not legal mail-parameter values.
1007 * We used to include ctl->remotename in this log line,
1008 * but this can be secure information that would be bad
1011 sprintf(buf, "\tby %s with %s (fetchmail-%s)\r\n",
1015 n = stuffline(ctl, buf);
1019 if (good_addresses == 0)
1022 "for %s@%s (by default); ",
1023 user, ctl->destaddr);
1025 else if (good_addresses == 1)
1027 for (idp = msgblk.recipients; idp; idp = idp->next)
1028 if (idp->val.status.mark == XMIT_ACCEPT)
1029 break; /* only report first address */
1030 if (strchr(idp->id, '@'))
1031 sprintf(buf+1, "for %s", idp->id);
1034 * This could be a bit misleading, as destaddr is
1035 * the forwarding host rather than the actual
1036 * destination. Most of the time they coincide.
1038 sprintf(buf+1, "for %s@%s", idp->id, ctl->destaddr);
1039 sprintf(buf+strlen(buf), " (%s); ",
1040 MULTIDROP(ctl) ? "multi-drop" : "single-drop");
1045 strcat(buf, rfc822timestamp());
1046 strcat(buf, "\r\n");
1047 n = stuffline(ctl, buf);
1053 n = stuffline(ctl, rcv); /* ship out rest of msgblk.headers */
1057 report(stdout, _("writing RFC822 msgblk.headers\n"));
1059 free(msgblk.headers);
1060 free_str_list(&msgblk.recipients);
1063 else if ((run.poll_interval == 0 || nodetach) && outlevel >= O_VERBOSE && !isafile(2))
1066 /* write error notifications */
1067 if (no_local_matches || has_nuls || bad_addresses)
1070 char errhd[USERNAMELEN + POPBUFSIZE], *errmsg;
1073 (void) strcpy(errhd, "X-Fetchmail-Warning: ");
1074 if (no_local_matches)
1076 if (reject_count != 1)
1077 strcat(errhd, _("no recipient addresses matched declared local names"));
1080 for (idp = msgblk.recipients; idp; idp = idp->next)
1081 if (idp->val.status.mark == XMIT_REJECT)
1083 sprintf(errhd+strlen(errhd), _("recipient address %s didn't match any local name"), idp->id);
1089 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1090 strcat(errhd, "; ");
1091 strcat(errhd, _("message has embedded NULs"));
1096 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1097 strcat(errhd, "; ");
1098 strcat(errhd, _("SMTP listener rejected local recipient addresses: "));
1099 errlen = strlen(errhd);
1100 for (idp = msgblk.recipients; idp; idp = idp->next)
1101 if (idp->val.status.mark == XMIT_RCPTBAD)
1102 errlen += strlen(idp->id) + 2;
1104 xalloca(errmsg, char *, errlen+3);
1105 (void) strcpy(errmsg, errhd);
1106 for (idp = msgblk.recipients; idp; idp = idp->next)
1107 if (idp->val.status.mark == XMIT_RCPTBAD)
1109 strcat(errmsg, idp->id);
1111 strcat(errmsg, ", ");
1116 strcat(errmsg, "\r\n");
1118 /* ship out the error line */
1119 stuffline(ctl, errmsg);
1122 /* issue the delimiter line */
1127 stuffline(ctl, buf);
1129 free(msgblk.headers);
1130 free_str_list(&msgblk.recipients);
1131 return(headers_ok ? PS_SUCCESS : PS_TRUNCATED);
1134 static int readbody(int sock, struct query *ctl, flag forward, int len)
1135 /* read and dispose of a message body presented on sock */
1136 /* ctl: query control record */
1137 /* sock: to which the server is connected */
1138 /* len: length of message */
1139 /* forward: TRUE to forward */
1142 unsigned char buf[MSGBUFSIZE+4];
1143 unsigned char *inbufp = buf;
1144 flag issoftline = FALSE;
1147 * Pass through the text lines in the body.
1149 * Yes, this wants to be ||, not &&. The problem is that in the most
1150 * important delimited protocol, POP3, the length is not reliable.
1151 * As usual, the problem is Microsoft brain damage; see FAQ item S2.
1152 * So, for delimited protocols we need to ignore the length here and
1153 * instead drop out of the loop with a break statement when we see
1154 * the message delimiter.
1156 while (protocol->delimited || len > 0)
1158 set_timeout(mytimeout);
1159 if ((linelen = SockRead(sock, inbufp, sizeof(buf)-4-(inbufp-buf)))==-1)
1167 /* write the message size dots */
1170 sizeticker += linelen;
1171 while (sizeticker >= SIZETICKER)
1173 if ((run.poll_interval == 0 || nodetach) && outlevel > O_SILENT && !isafile(1))
1178 sizeticker -= SIZETICKER;
1183 /* check for end of message */
1184 if (protocol->delimited && *inbufp == '.')
1186 if (inbufp[1] == '\r' && inbufp[2] == '\n' && inbufp[3] == '\0')
1188 else if (inbufp[1] == '\n' && inbufp[2] == '\0')
1191 msglen--; /* subtract the size of the dot escape */
1196 if (ctl->mimedecode && (ctl->mimemsg & MSG_NEEDS_DECODE)) {
1197 issoftline = UnMimeBodyline(&inbufp, protocol->delimited, issoftline);
1198 if (issoftline && (sizeof(buf)-1-(inbufp-buf) < 200))
1201 * Soft linebreak, but less than 200 bytes left in
1202 * input buffer. Rather than doing a buffer overrun,
1203 * ignore the soft linebreak, NL-terminate data and
1204 * deliver what we have now.
1205 * (Who writes lines longer than 2K anyway?)
1207 *inbufp = '\n'; *(inbufp+1) = '\0';
1212 /* ship out the text line */
1213 if (forward && (!issoftline))
1218 /* guard against very long lines */
1219 buf[MSGBUFSIZE+1] = '\r';
1220 buf[MSGBUFSIZE+2] = '\n';
1221 buf[MSGBUFSIZE+3] = '\0';
1223 n = stuffline(ctl, buf);
1227 report(stdout, _("writing message text\n"));
1231 else if (outlevel >= O_VERBOSE && !isafile(1))
1244 kerberos_auth (socket, canonical)
1245 /* authenticate to the server host using Kerberos V4 */
1246 int socket; /* socket to server host */
1247 #if defined(__FreeBSD__) || defined(__OpenBSD__)
1248 char *canonical; /* server name */
1250 const char *canonical; /* server name */
1253 char * host_primary;
1257 Key_schedule schedule;
1260 xalloca(ticket, KTEXT, sizeof (KTEXT_ST));
1261 rem = (krb_sendauth (0L, socket, ticket, "pop",
1263 ((char *) (krb_realmofhost (canonical))),
1264 ((unsigned long) 0),
1268 ((struct sockaddr_in *) 0),
1269 ((struct sockaddr_in *) 0),
1271 if (rem != KSUCCESS)
1273 report(stderr, _("kerberos error %s\n"), (krb_get_err_text (rem)));
1274 return (PS_AUTHFAIL);
1278 #endif /* KERBEROS_V4 */
1281 static int kerberos5_auth(socket, canonical)
1282 /* authenticate to the server host using Kerberos V5 */
1283 int socket; /* socket to server host */
1284 const char *canonical; /* server name */
1286 krb5_error_code retval;
1287 krb5_context context;
1289 krb5_principal client = NULL, server = NULL;
1290 krb5_error *err_ret = NULL;
1292 krb5_auth_context auth_context = NULL;
1294 krb5_init_context(&context);
1295 krb5_init_ets(context);
1296 krb5_auth_con_init(context, &auth_context);
1298 if (retval = krb5_cc_default(context, &ccdef)) {
1299 report(stderr, "krb5_cc_default: %s\n", error_message(retval));
1303 if (retval = krb5_cc_get_principal(context, ccdef, &client)) {
1304 report(stderr, "krb5_cc_get_principal: %s\n", error_message(retval));
1308 if (retval = krb5_sname_to_principal(context, canonical, "pop",
1311 report(stderr, "krb5_sname_to_principal: %s\n", error_message(retval));
1315 retval = krb5_sendauth(context, &auth_context, (krb5_pointer) &socket,
1316 "KPOPV1.0", client, server,
1317 AP_OPTS_MUTUAL_REQUIRED,
1318 NULL, /* no data to checksum */
1319 0, /* no creds, use ccache instead */
1323 NULL); /* don't need reply */
1325 krb5_free_principal(context, server);
1326 krb5_free_principal(context, client);
1327 krb5_auth_con_free(context, auth_context);
1331 if (err_ret && err_ret->e_text) {
1332 report(stderr, _("krb5_sendauth: %s [server says '%*s'] \n"),
1333 error_message(retval),
1336 if (err_ret && err_ret->text.length) {
1337 report(stderr, _("krb5_sendauth: %s [server says '%*s'] \n"),
1338 error_message(retval),
1339 err_ret->text.length,
1340 err_ret->text.data);
1342 krb5_free_error(context, err_ret);
1344 report(stderr, "krb5_sendauth: %s\n", error_message(retval));
1350 #endif /* KERBEROS_V5 */
1352 static void clean_skipped_list(struct idlist **skipped_list)
1353 /* struct "idlist" contains no "prev" ptr; we must remove unused items first */
1355 struct idlist *current=NULL, *prev=NULL, *tmp=NULL, *head=NULL;
1356 prev = current = head = *skipped_list;
1362 /* if item has no reference, remove it */
1363 if (current && current->val.status.mark == 0)
1365 if (current == head) /* remove first item (head) */
1367 head = current->next;
1368 if (current->id) free(current->id);
1370 prev = current = head;
1372 else /* remove middle/last item */
1374 tmp = current->next;
1376 if (current->id) free(current->id);
1381 else /* skip this item */
1384 current = current->next;
1388 *skipped_list = head;
1391 static void send_size_warnings(struct query *ctl)
1392 /* send warning mail with skipped msg; reset msg count when user notified */
1395 int msg_to_send = FALSE;
1396 struct idlist *head=NULL, *current=NULL;
1397 int max_warning_poll_count;
1398 #define OVERHD "Subject: Fetchmail oversized-messages warning.\r\n\r\nThe following oversized messages remain on the mail server %s:"
1400 head = ctl->skipped;
1404 /* don't start a notification message unless we need to */
1405 for (current = head; current; current = current->next)
1406 if (current->val.status.num == 0 && current->val.status.mark)
1412 * There's no good way to recover if we can't send notification mail,
1413 * but it's not a disaster, either, since the skipped mail will not
1416 if (open_warning_by_mail(ctl, (struct msgblk *)NULL))
1418 stuff_warning(ctl, OVERHD, ctl->server.pollname);
1420 if (run.poll_interval == 0)
1421 max_warning_poll_count = 0;
1423 max_warning_poll_count = ctl->warnings/run.poll_interval;
1425 /* parse list of skipped msg, adding items to the mail */
1426 for (current = head; current; current = current->next)
1428 if (current->val.status.num == 0 && current->val.status.mark)
1430 nbr = current->val.status.mark;
1431 size = atoi(current->id);
1433 _("\t%d msg %d octets long skipped by fetchmail.\r\n"),
1436 current->val.status.num++;
1437 current->val.status.mark = 0;
1439 if (current->val.status.num >= max_warning_poll_count)
1440 current->val.status.num = 0;
1443 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1447 static int do_session(ctl, proto, maxfetch)
1448 /* retrieve messages from server using given protocol method table */
1449 struct query *ctl; /* parsed options with merged-in defaults */
1450 const struct method *proto; /* protocol method table */
1451 const int maxfetch; /* maximum number of messages to fetch */
1454 #ifdef HAVE_VOLATILE
1455 volatile int ok, mailserver_socket = -1; /* pacifies -Wall */
1457 int ok, mailserver_socket = -1;
1458 #endif /* HAVE_VOLATILE */
1460 void (*pipesave)(int);
1461 void (*alrmsave)(int);
1462 struct idlist *current=NULL, *tmp=NULL;
1465 ctl->server.base_protocol = protocol;
1469 tag[0] = '\0'; /* nuke any tag hanging out from previous query */
1472 /* set up the server-nonresponse timeout */
1473 alrmsave = signal(SIGALRM, timeout_handler);
1474 mytimeout = ctl->server.timeout;
1476 /* set up the broken-pipe timeout */
1477 pipesave = signal(SIGPIPE, sigpipe_handler);
1479 if ((js = setjmp(restart)))
1481 #ifdef HAVE_SIGPROCMASK
1483 * Don't rely on setjmp() to restore the blocked-signal mask.
1484 * It does this under BSD but is required not to under POSIX.
1486 * If your Unix doesn't have sigprocmask, better hope it has
1487 * BSD-like behavior. Otherwise you may see fetchmail get
1488 * permanently wedged after a second timeout on a bad read,
1489 * because alarm signals were blocked after the first.
1493 sigfillset(&allsigs);
1494 sigprocmask(SIG_UNBLOCK, &allsigs, NULL);
1495 #endif /* HAVE_SIGPROCMASK */
1497 if (js == THROW_SIGPIPE)
1499 signal(SIGPIPE, SIG_IGN);
1501 _("SIGPIPE thrown from an MDA or a stream socket error\n"));
1505 else if (js == THROW_TIMEOUT)
1507 if (phase == OPEN_WAIT)
1509 _("timeout after %d seconds waiting to connect to server %s.\n"),
1510 ctl->server.timeout, ctl->server.pollname);
1511 else if (phase == SERVER_WAIT)
1513 _("timeout after %d seconds waiting for server %s.\n"),
1514 ctl->server.timeout, ctl->server.pollname);
1515 else if (phase == FORWARDING_WAIT)
1517 _("timeout after %d seconds waiting for %s.\n"),
1518 ctl->server.timeout,
1519 ctl->mda ? "MDA" : "SMTP");
1520 else if (phase == LISTENER_WAIT)
1522 _("timeout after %d seconds waiting for listener to respond.\n"), ctl->server.timeout);
1525 _("timeout after %d seconds.\n"), ctl->server.timeout);
1528 * If we've exceeded our threshold for consecutive timeouts,
1529 * try to notify the user, then mark the connection wedged.
1530 * Don't do this if the connection can idle, though; idle
1531 * timeouts just mean the frequency of mail is low.
1533 if (timeoutcount > MAX_TIMEOUTS
1534 && !open_warning_by_mail(ctl, (struct msgblk *)NULL))
1537 _("Subject: fetchmail sees repeated timeouts\r\n"));
1539 _("Fetchmail saw more than %d timeouts while attempting to get mail from %s@%s.\r\n"),
1542 ctl->server.truename);
1544 _("This could mean that your mailserver is stuck, or that your SMTP\r\n" \
1545 "server is wedged, or that your mailbox file on the server has been\r\n" \
1546 "corrupted by a server error. You can run `fetchmail -v -v' to\r\n" \
1547 "diagnose the problem.\r\n\r\n" \
1548 "Fetchmail won't poll this mailbox again until you restart it.\r\n"));
1549 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1556 /* try to clean up all streams */
1558 if (ctl->smtp_socket != -1)
1559 SockClose(ctl->smtp_socket);
1560 if (mailserver_socket != -1)
1561 SockClose(mailserver_socket);
1565 char buf[MSGBUFSIZE+1], *realhost;
1566 int len, num, count, new, bytes, deletions = 0, *msgsizes = NULL;
1568 int fetches, dispatches, oldphase;
1569 #else /* INET6_ENABLE */
1570 int port, fetches, dispatches, oldphase;
1571 #endif /* INET6_ENABLE */
1574 /* execute pre-initialization command, if any */
1575 if (ctl->preconnect && (ok = system(ctl->preconnect)))
1578 _("pre-connection command failed with status %d\n"), ok);
1583 /* open a socket to the mail server */
1586 set_timeout(mytimeout);
1589 port = ctl->server.port ? ctl->server.port : ( ctl->use_ssl ? protocol->sslport : protocol->port );
1591 port = ctl->server.port ? ctl->server.port : protocol->port;
1593 #endif /* !INET6_ENABLE */
1594 realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname;
1596 /* allow time for the port to be set up if we have a plugin */
1597 if (ctl->server.plugin)
1600 if ((mailserver_socket = SockOpen(realhost,
1601 ctl->server.service ? ctl->server.service : ( ctl->use_ssl ? protocol->sslservice : protocol->service ),
1602 ctl->server.netsec, ctl->server.plugin)) == -1)
1603 #else /* INET6_ENABLE */
1604 if ((mailserver_socket = SockOpen(realhost, port, NULL, ctl->server.plugin)) == -1)
1605 #endif /* INET6_ENABLE */
1607 char errbuf[BUFSIZ];
1610 #ifdef HAVE_RES_SEARCH
1611 if (err_no != 0 && h_errno != 0)
1612 report(stderr, _("fetchmail: internal inconsistency\n"));
1615 * Avoid generating a bogus error every poll cycle when we're
1616 * in daemon mode but the connection to the outside world
1619 if (!((err_no == EHOSTUNREACH || err_no == ENETUNREACH)
1620 && run.poll_interval))
1622 report_build(stderr, _("fetchmail: %s connection to %s failed"),
1623 protocol->name, ctl->server.pollname);
1624 #ifdef HAVE_RES_SEARCH
1627 if (h_errno == HOST_NOT_FOUND)
1628 strcpy(errbuf, _("host is unknown."));
1630 else if (h_errno == NO_ADDRESS)
1631 strcpy(errbuf, _("name is valid but has no IP address."));
1633 else if (h_errno == NO_RECOVERY)
1634 strcpy(errbuf, _("unrecoverable name server error."));
1635 else if (h_errno == TRY_AGAIN)
1636 strcpy(errbuf, _("temporary name server error."));
1638 sprintf(errbuf, _("unknown DNS error %d."), h_errno);
1641 #endif /* HAVE_RES_SEARCH */
1642 strcpy(errbuf, strerror(err_no));
1643 report_complete(stderr, ": %s\n", errbuf);
1647 * Don't use this. It was an attempt to address Debian bug
1648 * #47143 (Notify user by mail when pop server nonexistent).
1649 * Trouble is, that doesn't work; you trip over the case
1650 * where your SLIP or PPP link is down...
1652 /* warn the system administrator */
1653 if (open_warning_by_mail(ctl, (struct msgblk *)NULL) == 0)
1655 #define OPENFAIL "Subject: Fetchmail unreachable-server warning.\r\n\r\nFetchmail could not reach the mail server %s:"
1656 stuff_warning(ctl, OPENFAIL, ctl->server.pollname);
1657 stuff_warning(ctl, errbuf, ctl->server.pollname);
1658 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1663 #endif /* INET6_ENABLE */
1673 /* perform initial SSL handshake on open connection */
1674 /* Note: We pass the realhost name over for certificate
1675 verification. We may want to make this configurable */
1676 if (ctl->use_ssl && SSLOpen(mailserver_socket,ctl->sslkey,ctl->sslcert,realhost) == -1)
1678 report(stderr, "SSL connection failed.\n");
1684 if (ctl->server.preauthenticate == A_KERBEROS_V4)
1686 set_timeout(mytimeout);
1687 ok = kerberos_auth(mailserver_socket, ctl->server.truename);
1692 #endif /* KERBEROS_V4 */
1695 if (ctl->server.preauthenticate == A_KERBEROS_V5)
1697 set_timeout(mytimeout);
1698 ok = kerberos5_auth(mailserver_socket, ctl->server.truename);
1703 #endif /* KERBEROS_V5 */
1705 /* accept greeting message from mail server */
1706 ok = (protocol->parse_response)(mailserver_socket, buf);
1710 /* try to get authorized to fetch mail */
1711 stage = STAGE_GETAUTH;
1712 if (protocol->getauth)
1714 if (protocol->password_canonify)
1715 (protocol->password_canonify)(shroud, ctl->password, PASSWORDLEN);
1717 strcpy(shroud, ctl->password);
1719 ok = (protocol->getauth)(mailserver_socket, ctl, buf);
1722 if (ok == PS_LOCKBUSY)
1723 report(stderr, _("Lock-busy error on %s@%s\n"),
1725 ctl->server.truename);
1726 else if (ok == PS_AUTHFAIL)
1728 report(stderr, _("Authorization failure on %s@%s\n"),
1730 ctl->server.truename);
1733 * If we're running in background, try to mail the
1734 * calling user a heads-up about the authentication
1735 * failure once it looks like this isn't a fluke
1736 * due to the server being temporarily inaccessible.
1738 if (run.poll_interval
1739 && ctl->authfailcount++ > MAX_AUTHFAILS
1740 && !open_warning_by_mail(ctl, (struct msgblk *)NULL))
1743 _("Subject: fetchmail authentication failed\r\n"));
1745 _("Fetchmail could not get mail from %s@%s.\r\n"),
1747 ctl->server.truename);
1749 _("The attempt to get authorization failed.\r\n" \
1750 "This probably means your password is invalid, but POP3 servers have\r\n" \
1751 "other failure modes that fetchmail cannot distinguish from this\r\n" \
1752 "because they don't send useful error messages on login failure.\r\n"));
1753 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1758 report(stderr, _("Unknown login or authentication error on %s@%s\n"),
1760 ctl->server.truename);
1766 ctl->errcount = fetches = 0;
1768 /* now iterate over each folder selected */
1769 for (idp = ctl->mailboxes; idp; idp = idp->next)
1776 /* reset timeout, in case we did an IDLE */
1777 mytimeout = ctl->server.timeout;
1779 if (outlevel >= O_DEBUG)
1782 report(stdout, _("selecting or re-polling folder %s\n"), idp->id);
1784 report(stdout, _("selecting or re-polling default folder\n"));
1787 /* compute # of messages and number of new messages waiting */
1788 stage = STAGE_GETRANGE;
1789 ok = (protocol->getrange)(mailserver_socket, ctl, idp->id, &count, &new, &bytes);
1793 /* show user how many messages we downloaded */
1795 (void) sprintf(buf, _("%s at %s (folder %s)"),
1796 ctl->remotename, ctl->server.truename, idp->id);
1798 (void) sprintf(buf, _("%s at %s"),
1799 ctl->remotename, ctl->server.truename);
1800 if (outlevel > O_SILENT)
1802 if (count == -1) /* only used for ETRN */
1803 report(stdout, _("Polling %s\n"), ctl->server.truename);
1804 else if (count != 0)
1806 if (new != -1 && (count - new) > 0)
1807 report_build(stdout, _("%d %s (%d seen) for %s"),
1808 count, count > 1 ? _("messages") :
1812 report_build(stdout, _("%d %s for %s"),
1813 count, count > 1 ? _("messages") :
1816 report_complete(stdout, ".\n");
1818 report_complete(stdout, _(" (%d octets).\n"), bytes);
1822 /* these are pointless in normal daemon mode */
1823 if (pass == 1 && (run.poll_interval == 0 || outlevel >= O_VERBOSE))
1824 report(stdout, _("No mail for %s\n"), buf);
1828 /* very important, this is where we leave the do loop */
1834 if (new == -1 || ctl->fetchall)
1836 fetches = new; /* set error status ccorrectly */
1838 * There used to be a `got noerror' here, but this
1839 * prevneted checking of multiple folders. This
1840 * comment is a reminder in case I introduced some
1841 * subtle bug by removing it...
1846 flag force_retrieval;
1849 * What forces this code is that in POP2 and
1850 * IMAP2bis you can't fetch a message without
1851 * having it marked `seen'. In POP3 and IMAP4, on the
1852 * other hand, you can (peek_capable is set by
1853 * each driver module to convey this; it's not a
1854 * method constant because of the difference between
1855 * IMAP2bis and IMAP4, and because POP3 doesn't peek
1856 * if fetchall is on).
1858 * The result of being unable to peek is that if there's
1859 * any kind of transient error (DNS lookup failure, or
1860 * sendmail refusing delivery due to process-table limits)
1861 * the message will be marked "seen" on the server without
1862 * having been delivered. This is not a big problem if
1863 * fetchmail is running in foreground, because the user
1864 * will see a "skipped" message when it next runs and get
1867 * But in daemon mode this leads to the message
1868 * being silently ignored forever. This is not
1871 * We compensate for this by checking the error
1872 * count from the previous pass and forcing all
1873 * messages to be considered new if it's nonzero.
1875 force_retrieval = !peek_capable && (ctl->errcount > 0);
1878 * We need the size of each message before it's
1879 * loaded in order to pass it to the ESMTP SIZE
1880 * option. If the protocol has a getsizes method,
1881 * we presume this means it doesn't get reliable
1882 * sizes from message fetch responses.
1884 if (proto->getsizes)
1888 xalloca(msgsizes, int *, sizeof(int) * count);
1889 for (i = 0; i < count; i++)
1892 stage = STAGE_GETSIZES;
1893 ok = (proto->getsizes)(mailserver_socket, count, msgsizes);
1900 for (i = 0; i < count; i++)
1901 bytes += msgsizes[i];
1905 /* read, forward, and delete messages */
1906 stage = STAGE_FETCH;
1907 for (num = 1; num <= count; num++)
1909 flag toolarge = NUM_NONZERO(ctl->limit)
1910 && msgsizes && (msgsizes[num-1] > ctl->limit);
1911 flag oldmsg = (!new) || (protocol->is_old && (protocol->is_old)(mailserver_socket,ctl,num));
1912 flag fetch_it = !toolarge
1913 && (ctl->fetchall || force_retrieval || !oldmsg);
1914 flag suppress_delete = FALSE;
1915 flag suppress_forward = FALSE;
1916 flag suppress_readbody = FALSE;
1917 flag retained = FALSE;
1920 * This check copes with Post Office/NT's
1921 * annoying habit of randomly prepending bogus
1922 * LIST items of length -1. Patrick Audley
1923 * <paudley@pobox.com> tells us: LIST shows a
1924 * size of -1, RETR and TOP return "-ERR
1925 * System error - couldn't open message", and
1926 * DELE succeeds but doesn't actually delete
1929 if (msgsizes && msgsizes[num-1] == -1)
1931 if (outlevel >= O_VERBOSE)
1933 _("Skipping message %d, length -1\n"),
1939 * We may want to reject this message if it's old
1940 * or oversized, and we're not forcing retrieval.
1944 if (outlevel > O_SILENT)
1946 report_build(stdout, _("skipping message %d"), num);
1947 if (toolarge && !check_only)
1952 /* convert sz to string */
1953 sprintf(size, "%d", msgsizes[num-1]);
1955 /* build a list of skipped messages
1956 * val.id = size of msg (string cnvt)
1957 * val.status.num = warning_poll_count
1958 * val.status.mask = nbr of msg this size
1961 current = ctl->skipped;
1963 /* initialise warning_poll_count to the
1964 * current value so that all new msg will
1965 * be included in the next mail
1967 cnt = current? current->val.status.num : 0;
1969 /* if entry exists, increment the count */
1971 str_in_list(¤t, size, FALSE))
1974 current = current->next)
1976 if (strcmp(current->id, size) == 0)
1978 current->val.status.mark++;
1983 /* otherwise, create a new entry */
1984 /* initialise with current poll count */
1987 tmp = save_str(&ctl->skipped, size, 1);
1988 tmp->val.status.num = cnt;
1991 report_build(stdout, _(" (oversized, %d octets)"),
1998 flag wholesize = !protocol->fetch_body;
2000 /* request a message */
2001 ok = (protocol->fetch_headers)(mailserver_socket,ctl,num, &len);
2005 /* -1 means we didn't see a size in the response */
2006 if (len == -1 && msgsizes)
2008 len = msgsizes[num - 1];
2012 if (outlevel > O_SILENT)
2014 report_build(stdout, _("reading message %d of %d"),
2018 report_build(stdout, _(" (%d %soctets)"),
2019 len, wholesize ? "" : _("header "));
2020 if (outlevel >= O_VERBOSE)
2021 report_complete(stdout, "\n");
2023 report_complete(stdout, " ");
2027 * Read the message headers and ship them to the
2030 ok = readheaders(mailserver_socket, len, msgsizes[num-1],
2032 if (ok == PS_RETAINED)
2033 suppress_forward = retained = TRUE;
2034 else if (ok == PS_TRANSIENT)
2035 suppress_delete = suppress_forward = TRUE;
2036 else if (ok == PS_REFUSED)
2037 suppress_forward = TRUE;
2038 else if (ok == PS_TRUNCATED)
2039 suppress_readbody = TRUE;
2044 * If we're using IMAP4 or something else that
2045 * can fetch headers separately from bodies,
2046 * it's time to request the body now. This
2047 * fetch may be skipped if we got an anti-spam
2048 * or other PS_REFUSED error response during
2051 if (protocol->fetch_body && !suppress_readbody)
2053 if (outlevel >= O_VERBOSE && !isafile(1))
2055 fputc('\n', stdout);
2059 if ((ok = (protocol->trail)(mailserver_socket, ctl, num)))
2062 if (!suppress_forward)
2064 if ((ok=(protocol->fetch_body)(mailserver_socket,ctl,num,&len)))
2067 * Work around a bug in Novell's
2068 * broken GroupWise IMAP server;
2069 * its body FETCH response is missing
2070 * the required length for the data
2071 * string. This violates RFC2060.
2074 len = msgsizes[num-1] - msglen;
2075 if (outlevel > O_SILENT && !wholesize)
2076 report_complete(stdout,
2077 _(" (%d body octets) "), len);
2081 /* process the body now */
2084 if (suppress_readbody)
2086 /* When readheaders returns PS_TRUNCATED,
2087 the body (which has no content
2088 has already been read by readheaders,
2089 so we say readbody returned PS_SUCCESS */
2094 ok = readbody(mailserver_socket,
2099 if (ok == PS_TRANSIENT)
2100 suppress_delete = suppress_forward = TRUE;
2104 /* tell server we got it OK and resynchronize */
2105 if (protocol->trail)
2107 if (outlevel >= O_VERBOSE && !isafile(1))
2109 fputc('\n', stdout);
2113 ok = (protocol->trail)(mailserver_socket, ctl, num);
2119 /* count # messages forwarded on this pass */
2120 if (!suppress_forward)
2124 * Check to see if the numbers matched?
2126 * Yes, some servers foo this up horribly.
2127 * All IMAP servers seem to get it right, and
2128 * so does Eudora QPOP at least in 2.xx
2131 * Microsoft Exchange gets it completely
2132 * wrong, reporting compressed rather than
2133 * actual sizes (so the actual length of
2134 * message is longer than the reported size).
2135 * Another fine example of Microsoft brain death!
2137 * Some older POP servers, like the old UCB
2138 * POP server and the pre-QPOP QUALCOMM
2139 * versions, report a longer size in the LIST
2140 * response than actually gets shipped up.
2141 * It's unclear what is going on here, as the
2142 * QUALCOMM server (at least) seems to be
2143 * reporting the on-disk size correctly.
2145 if (msgsizes && msglen != msgsizes[num-1])
2147 if (outlevel >= O_DEBUG)
2149 _("message %d was not the expected length (%d actual != %d expected)\n"),
2150 num, msglen, msgsizes[num-1]);
2153 /* end-of-message processing starts here */
2154 if (!close_sink(ctl, &msgblk, !suppress_forward))
2157 suppress_delete = TRUE;
2163 * At this point in flow of control, either
2164 * we've bombed on a protocol error or had
2165 * delivery refused by the SMTP server
2166 * (unlikely -- I've never seen it) or we've
2167 * seen `accepted for delivery' and the
2168 * message is shipped. It's safe to mark the
2169 * message seen and delete it on the server
2173 /* tell the UID code we've seen this */
2178 for (sdp = ctl->newsaved; sdp; sdp = sdp->next)
2179 if (sdp->val.status.num == num)
2180 sdp->val.status.mark = UID_SEEN;
2183 /* maybe we delete this message now? */
2186 if (outlevel > O_SILENT)
2187 report(stdout, _(" retained\n"));
2189 else if (protocol->delete
2191 && (fetch_it ? !ctl->keep : ctl->flush))
2194 if (outlevel > O_SILENT)
2195 report_complete(stdout, _(" flushed\n"));
2196 ok = (protocol->delete)(mailserver_socket, ctl, num);
2200 delete_str(&ctl->newsaved, num);
2201 #endif /* POP3_ENABLE */
2203 else if (outlevel > O_SILENT)
2204 report_complete(stdout, _(" not flushed\n"));
2206 /* perhaps this as many as we're ready to handle */
2207 if (maxfetch && maxfetch <= fetches && fetches < count)
2209 report(stdout, _("fetchlimit %d reached; %d messages left on server\n"),
2210 maxfetch, count - fetches);
2216 if (!check_only && ctl->skipped
2217 && run.poll_interval > 0 && !nodetach)
2219 clean_skipped_list(&ctl->skipped);
2220 send_size_warnings(ctl);
2225 * Only re-poll if we either had some actual forwards and
2226 * either allowed deletions and had no errors.
2227 * Otherwise it is far too easy to get into infinite loops.
2229 (dispatches && protocol->retry && !ctl->keep && !ctl->errcount);
2233 /* ordinary termination with no errors -- officially log out */
2234 ok = (protocol->logout_cmd)(mailserver_socket, ctl);
2236 * Hmmmm...arguably this would be incorrect if we had fetches but
2237 * no dispatches (due to oversized messages, etc.)
2240 ok = (fetches > 0) ? PS_SUCCESS : PS_NOMAIL;
2241 SockClose(mailserver_socket);
2245 /* we only get here on error */
2246 if (ok != 0 && ok != PS_SOCKET)
2248 stage = STAGE_LOGOUT;
2249 (protocol->logout_cmd)(mailserver_socket, ctl);
2251 SockClose(mailserver_socket);
2254 msg = (const char *)NULL; /* sacrifice to -Wall */
2261 msg = _("authorization");
2264 msg = _("missing or bad RFC822 header");
2270 msg = _("client/server synchronization");
2273 msg = _("client/server protocol");
2276 msg = _("lock busy on server");
2279 msg = _("SMTP transaction");
2282 msg = _("DNS lookup");
2285 report(stderr, _("undefined error\n"));
2288 /* no report on PS_MAXFETCH or PS_UNDEFINED */
2289 if (ok==PS_SOCKET || ok==PS_AUTHFAIL || ok==PS_SYNTAX
2290 || ok==PS_IOERR || ok==PS_ERROR || ok==PS_PROTOCOL
2291 || ok==PS_LOCKBUSY || ok==PS_SMTP || ok==PS_DNS)
2292 report(stderr, _("%s error while fetching from %s\n"), msg, ctl->server.pollname);
2295 /* execute post-initialization command, if any */
2296 if (ctl->postconnect && (ok = system(ctl->postconnect)))
2298 report(stderr, _("post-connection command failed with status %d\n"), ok);
2299 if (ok == PS_SUCCESS)
2303 signal(SIGALRM, alrmsave);
2304 signal(SIGPIPE, pipesave);
2308 int do_protocol(ctl, proto)
2309 /* retrieve messages from server using given protocol method table */
2310 struct query *ctl; /* parsed options with merged-in defaults */
2311 const struct method *proto; /* protocol method table */
2316 if (ctl->server.preauthenticate == A_KERBEROS_V4)
2318 report(stderr, _("Kerberos V4 support not linked.\n"));
2321 #endif /* KERBEROS_V4 */
2324 if (ctl->server.preauthenticate == A_KERBEROS_V5)
2326 report(stderr, _("Kerberos V5 support not linked.\n"));
2329 #endif /* KERBEROS_V5 */
2331 /* lacking methods, there are some options that may fail */
2334 /* check for unsupported options */
2337 _("Option --flush is not supported with %s\n"),
2341 else if (ctl->fetchall) {
2343 _("Option --all is not supported with %s\n"),
2348 if (!proto->getsizes && NUM_SPECIFIED(ctl->limit))
2351 _("Option --limit is not supported with %s\n"),
2357 * If no expunge limit or we do expunges within the driver,
2358 * then just do one session, passing in any fetchlimit.
2360 if (proto->retry || !NUM_SPECIFIED(ctl->expunge))
2361 return(do_session(ctl, proto, NUM_VALUE_OUT(ctl->fetchlimit)));
2363 * There's an expunge limit, and it isn't handled in the driver itself.
2364 * OK; do multiple sessions, each fetching a limited # of messages.
2365 * Stop if the total count of retrieved messages exceeds ctl->fetchlimit
2366 * (if it was nonzero).
2372 int expunge = NUM_VALUE_OUT(ctl->expunge);
2373 int fetchlimit = NUM_VALUE_OUT(ctl->fetchlimit);
2376 ok = do_session(ctl, proto, expunge);
2377 totalcount += expunge;
2378 if (NUM_SPECIFIED(ctl->fetchlimit) && totalcount >= fetchlimit)
2380 if (ok != PS_LOCKBUSY)
2382 else if (lockouts >= MAX_LOCKOUTS)
2384 else /* ok == PS_LOCKBUSY */
2387 * Allow time for the server lock to release. if we
2388 * don't do this, we'll often hit a locked-mailbox
2389 * condition and fail.
2395 (ok == PS_MAXFETCH || ok == PS_LOCKBUSY);
2401 #if defined(HAVE_STDARG_H)
2402 void gen_send(int sock, const char *fmt, ... )
2404 void gen_send(sock, fmt, va_alist)
2405 int sock; /* socket to which server is connected */
2406 const char *fmt; /* printf-style format */
2409 /* assemble command in printf(3) style and send to the server */
2411 char buf [MSGBUFSIZE+1];
2414 if (protocol->tagged)
2415 (void) sprintf(buf, "%s ", GENSYM);
2419 #if defined(HAVE_STDARG_H)
2424 #ifdef HAVE_VSNPRINTF
2425 vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap);
2427 vsprintf(buf + strlen(buf), fmt, ap);
2431 strcat(buf, "\r\n");
2432 SockWrite(sock, buf, strlen(buf));
2434 if (outlevel >= O_MONITOR)
2438 if (shroud && shroud[0] && (cp = strstr(buf, shroud)))
2442 sp = cp + strlen(shroud);
2448 buf[strlen(buf)-2] = '\0';
2449 report(stdout, "%s> %s\n", protocol->name, buf);
2453 int gen_recv(sock, buf, size)
2454 /* get one line of input from the server */
2455 int sock; /* socket to which server is connected */
2456 char *buf; /* buffer to receive input */
2457 int size; /* length of buffer */
2459 int oldphase = phase; /* we don't have to be re-entrant */
2461 phase = SERVER_WAIT;
2462 set_timeout(mytimeout);
2463 if (SockRead(sock, buf, size) == -1)
2472 if (buf[strlen(buf)-1] == '\n')
2473 buf[strlen(buf)-1] = '\0';
2474 if (buf[strlen(buf)-1] == '\r')
2475 buf[strlen(buf)-1] = '\0';
2476 if (outlevel >= O_MONITOR)
2477 report(stdout, "%s< %s\n", protocol->name, buf);
2483 #if defined(HAVE_STDARG_H)
2484 int gen_transact(int sock, const char *fmt, ... )
2486 int gen_transact(int sock, fmt, va_alist)
2487 int sock; /* socket to which server is connected */
2488 const char *fmt; /* printf-style format */
2491 /* assemble command in printf(3) style, send to server, accept a response */
2494 char buf [MSGBUFSIZE+1];
2496 int oldphase = phase; /* we don't have to be re-entrant */
2498 phase = SERVER_WAIT;
2500 if (protocol->tagged)
2501 (void) sprintf(buf, "%s ", GENSYM);
2505 #if defined(HAVE_STDARG_H)
2510 #ifdef HAVE_VSNPRINTF
2511 vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap);
2513 vsprintf(buf + strlen(buf), fmt, ap);
2517 strcat(buf, "\r\n");
2518 SockWrite(sock, buf, strlen(buf));
2520 if (outlevel >= O_MONITOR)
2524 if (shroud && shroud[0] && (cp = strstr(buf, shroud)))
2528 sp = cp + strlen(shroud);
2534 buf[strlen(buf)-1] = '\0';
2535 report(stdout, "%s> %s\n", protocol->name, buf);
2538 /* we presume this does its own response echoing */
2539 ok = (protocol->parse_response)(sock, buf);
2545 /* driver.c ends here */