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_RES_SEARCH
37 #endif /* HAVE_RES_SEARCH */
41 #include <kerberosIV/des.h>
42 #include <kerberosIV/krb.h>
44 #if defined (__bsdi__)
45 #include <des.h> /* order of includes matters */
47 #define krb_get_err_text(e) (krb_err_txt[e])
49 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__)
50 #define krb_get_err_text(e) (krb_err_txt[e])
56 #endif /* ! defined (__FreeBSD__) */
57 #endif /* ! defined (__bsdi__) */
58 #endif /* KERBEROS_V5 */
59 #include <netinet/in.h>
61 #endif /* KERBEROS_V4 */
65 #endif /* KERBEROS_V5 */
69 #include "fetchmail.h"
72 /* throw types for runtime errors */
73 #define THROW_TIMEOUT 1 /* server timed out */
74 #define THROW_SIGPIPE 2 /* SIGPIPE on stream socket */
76 #ifndef strstr /* glibc-2.1 declares this as a macro */
77 extern char *strstr(); /* needed on sysV68 R3V7.1. */
80 int batchcount; /* count of messages sent in current batch */
81 flag peek_capable; /* can we peek for better error recovery? */
82 int pass; /* how many times have we re-polled? */
83 int stage; /* where are we? */
84 int phase; /* where are we, for error-logging purposes? */
85 int mytimeout; /* value of nonreponse timeout */
87 static const struct method *protocol;
88 static jmp_buf restart;
92 #define GENSYM (sprintf(tag, "A%04d", ++tagnum % TAGMOD), tag)
94 static char shroud[PASSWORDLEN]; /* string to shroud in debug output */
95 static int timeoutcount; /* count consecutive timeouts */
96 static int msglen; /* actual message length */
98 void set_timeout(int timeleft)
99 /* reset the nonresponse-timeout */
102 struct itimerval ntimeout;
107 ntimeout.it_interval.tv_sec = ntimeout.it_interval.tv_usec = 0;
108 ntimeout.it_value.tv_sec = timeleft;
109 ntimeout.it_value.tv_usec = 0;
110 setitimer(ITIMER_REAL, &ntimeout, (struct itimerval *)NULL);
114 static void timeout_handler (int signal)
115 /* handle SIGALRM signal indicating a server timeout */
118 longjmp(restart, THROW_TIMEOUT);
121 static void sigpipe_handler (int signal)
122 /* handle SIGPIPE signal indicating a broken stream socket */
124 longjmp(restart, THROW_SIGPIPE);
127 static int accept_count, reject_count;
129 static void map_name(const char *name, struct query *ctl, struct idlist **xmit_names)
130 /* add given name to xmit_names if it matches declared localnames */
131 /* name: name to map */
132 /* ctl: list of permissible aliases */
133 /* xmit_names: list of recipient names parsed out */
138 lname = idpair_find(&ctl->localnames, name+off);
139 if (!lname && ctl->wildcard)
142 if (lname != (char *)NULL)
144 if (outlevel >= O_DEBUG)
145 report(stdout, _("mapped %s to local %s\n"), name, lname);
146 save_str(xmit_names, lname, XMIT_ACCEPT);
151 static void find_server_names(const char *hdr,
153 struct idlist **xmit_names)
154 /* parse names out of a RFC822 header into an ID list */
155 /* hdr: RFC822 header in question */
156 /* ctl: list of permissible aliases */
157 /* xmit_names: list of recipient names parsed out */
159 if (hdr == (char *)NULL)
165 for (cp = nxtaddr(hdr);
172 * If the name of the user begins with a qmail virtual
173 * domain prefix, ignore the prefix. Doing this here
174 * means qvirtual will work either with ordinary name
175 * mapping or with a localdomains option.
177 if (ctl->server.qvirtual)
179 int sl = strlen(ctl->server.qvirtual);
181 if (!strncasecmp(cp, ctl->server.qvirtual, sl))
185 if ((atsign = strchr(cp, '@'))) {
189 * Does a trailing segment of the hostname match something
190 * on the localdomains list? If so, save the whole name
193 for (idp = ctl->server.localdomains; idp; idp = idp->next) {
196 rhs = atsign + (strlen(atsign) - strlen(idp->id));
198 (rhs[-1] == '.' || rhs[-1] == '@') &&
199 strcasecmp(rhs, idp->id) == 0)
201 if (outlevel >= O_DEBUG)
202 report(stdout, _("passed through %s matching %s\n"),
204 save_str(xmit_names, cp, XMIT_ACCEPT);
210 /* if we matched a local domain, idp != NULL */
214 * Check to see if the right-hand part is an alias
215 * or MX equivalent of the mailserver. If it's
216 * not, skip this name. If it is, we'll keep
217 * going and try to find a mapping to a client name.
219 if (!is_host_alias(atsign+1, ctl))
221 save_str(xmit_names, cp, XMIT_REJECT);
227 map_name(cp, ctl, xmit_names);
235 * Return zero on a syntactically invalid address, nz on a valid one.
237 * This used to be strchr(a, '.'), but it turns out that lines like this
239 * Received: from punt-1.mail.demon.net by mailstore for markb@ordern.com
240 * id 938765929:10:27223:2; Fri, 01 Oct 99 08:18:49 GMT
242 * are not uncommon. So now we just check that the following token is
243 * not itself an email address.
245 #define VALID_ADDRESS(a) !strchr(a, '@')
247 static char *parse_received(struct query *ctl, char *bufp)
248 /* try to extract real address from the Received line */
249 /* If a valid Received: line is found, we return the full address in
250 * a buffer which can be parsed from nxtaddr(). This is to ansure that
251 * the local domain part of the address can be passed along in
252 * find_server_names() if it contains one.
253 * Note: We should return a dummy header containing the address
254 * which makes nxtaddr() behave correctly.
257 char *base, *ok = (char *)NULL;
258 static char rbuf[HOSTLEN + USERNAMELEN + 4];
261 * Try to extract the real envelope addressee. We look here
262 * specifically for the mailserver's Received line.
263 * Note: this will only work for sendmail, or an MTA that
264 * shares sendmail's convention for embedding the envelope
265 * address in the Received line. Sendmail itself only
266 * does this when the mail has a single recipient.
268 if (outlevel >= O_DEBUG)
269 report(stdout, _("analyzing Received line:\n%s"), bufp);
271 /* search for whitepace-surrounded "by" followed by valid address */
272 for (base = bufp; ; base = ok + 2)
274 if (!(ok = strstr(base, "by")))
276 else if (!isspace(ok[-1]) || !isspace(ok[2]))
282 /* extract space-delimited token after "by" */
283 for (sp = ok + 2; isspace(*sp); sp++)
286 for (; !isspace(*sp); sp++)
290 /* look for valid address */
291 if (VALID_ADDRESS(rbuf))
294 ok = sp - 1; /* arrange to skip this token */
300 * If it's a DNS name of the mail server, look for the
301 * recipient name after a following "for". Otherwise
304 if (is_host_alias(rbuf, ctl))
306 if (outlevel >= O_DEBUG)
308 _("line accepted, %s is an alias of the mailserver\n"), rbuf);
312 if (outlevel >= O_DEBUG)
314 _("line rejected, %s is not an alias of the mailserver\n"),
319 /* search for whitepace-surrounded "for" followed by xxxx@yyyy */
320 for (base = ok + 4 + strlen(rbuf); ; base = ok + 2)
322 if (!(ok = strstr(base, "for")))
324 else if (!isspace(ok[-1]) || !isspace(ok[3]))
330 /* extract space-delimited token after "for" */
331 for (sp = ok + 3; isspace(*sp); sp++)
334 for (; !isspace(*sp); sp++)
338 if (strchr(rbuf, '@'))
341 ok = sp - 1; /* arrange to skip this token */
346 flag want_gt = FALSE;
349 /* char after "for" could be space or a continuation newline */
350 for (sp = ok + 4; isspace(*sp); sp++)
353 *tp++ = ':'; /* Here is the hack. This is to be friends */
354 *tp++ = ' '; /* with nxtaddr()... */
360 while (*sp == '@') /* skip routes */
361 while (*sp && *sp++ != ':')
364 && (want_gt ? (*sp != '>') : !isspace(*sp))
370 /* uh oh -- whitespace here can't be right! */
376 if (strlen(rbuf) <= 3) /* apparently nothing has been found */
384 if (outlevel >= O_DEBUG)
385 report(stdout, _("no Received address found\n"));
390 if (outlevel >= O_DEBUG) {
391 char *lf = rbuf + strlen(rbuf)-1;
393 if (outlevel >= O_DEBUG)
394 report(stdout, _("found Received address `%s'\n"), rbuf+2);
401 /* shared by readheaders and readbody */
402 static int sizeticker;
403 static struct msgblk msgblk;
405 #define EMPTYLINE(s) ((s)[0] == '\r' && (s)[1] == '\n' && (s)[2] == '\0')
407 static int readheaders(int sock,
412 /* read message headers and ship to SMTP or MDA */
413 /* sock: to which the server is connected */
414 /* fetchlen: length of message according to fetch response */
415 /* reallen: length of message according to getsizes */
416 /* ctl: query control record */
417 /* num: index of message */
422 struct addrblk *next;
424 struct addrblk *to_addrchain = NULL;
425 struct addrblk **to_chainptr = &to_addrchain;
426 struct addrblk *resent_to_addrchain = NULL;
427 struct addrblk **resent_to_chainptr = &resent_to_addrchain;
429 char buf[MSGBUFSIZE+1];
430 int from_offs, reply_to_offs, resent_from_offs;
431 int app_from_offs, sender_offs, resent_sender_offs;
433 char *received_for, *rcv, *cp;
434 int n, linelen, oldlen, ch, remaining, skipcount;
436 flag no_local_matches = FALSE;
437 flag headers_ok, has_nuls;
438 int olderrs, good_addresses, bad_addresses;
441 has_nuls = headers_ok = FALSE;
442 msgblk.return_path[0] = '\0';
443 olderrs = ctl->errcount;
445 /* read message headers */
446 msgblk.reallen = reallen;
447 msgblk.headers = received_for = NULL;
448 from_offs = reply_to_offs = resent_from_offs = app_from_offs =
449 sender_offs = resent_sender_offs = env_offs = -1;
455 for (remaining = fetchlen; remaining > 0 || protocol->delimited; remaining -= linelen)
459 line = xmalloc(sizeof(buf));
463 set_timeout(mytimeout);
464 if ((n = SockRead(sock, buf, sizeof(buf)-1)) == -1) {
467 free(msgblk.headers);
474 /* lines may not be properly CRLF terminated; fix this for qmail */
477 cp = buf + strlen(buf) - 1;
478 if (*cp == '\n' && (cp == buf || cp[-1] != '\r'))
487 * Decode MIME encoded headers. We MUST do this before
488 * looking at the Content-Type / Content-Transfer-Encoding
489 * headers (RFC 2046).
494 line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
498 /* check for end of headers */
502 has_nuls = (linelen != strlen(line));
504 goto process_headers;
508 * Check for end of message immediately. If one of your folders
509 * has been mangled, the delimiter may occur directly after the
512 if (protocol->delimited && line[0] == '.' && EMPTYLINE(line+1))
515 has_nuls = (linelen != strlen(line));
516 goto process_headers;
519 /* check for RFC822 continuations */
520 set_timeout(mytimeout);
524 (ch == ' ' || ch == '\t'); /* continuation to next line? */
526 /* write the message size dots */
527 if ((outlevel > O_SILENT && outlevel < O_VERBOSE) && linelen > 0)
529 sizeticker += linelen;
530 while (sizeticker >= SIZETICKER)
532 if (!run.use_syslog && isatty(1))
537 sizeticker -= SIZETICKER;
541 /* we see an ordinary (non-header, non-message-delimiter line */
542 has_nuls = (linelen != strlen(line));
545 * When mail delivered to a multidrop mailbox on the server is
546 * addressed to multiple people on the client machine, there
547 * will be one copy left in the box for each recipient. Thus,
548 * if the mail is addressed to N people, each recipient will
551 * Foil this by suppressing all but one copy of a message with
552 * a given Message-ID. Note: This implementation only catches
553 * runs of successive identical messages, but that should be
556 * The accept_count test ensures that multiple pieces of identical
557 * email, each with a *single* addressee, won't be suppressed.
559 if (MULTIDROP(ctl) && accept_count > 1 && !strncasecmp(line, "Message-ID:", 11))
561 if (ctl->lastid && !strcasecmp(ctl->lastid, line))
567 ctl->lastid = strdup(line);
572 * The University of Washington IMAP server (the reference
573 * implementation of IMAP4 written by Mark Crispin) relies
574 * on being able to keep base-UID information in a special
575 * message at the head of the mailbox. This message should
576 * neither be deleted nor forwarded.
580 * We disable this check under POP2 because there's no way to
581 * prevent deletion of the message. So at least we ought to
582 * forward it to the user so he or she will have some clue
583 * that things have gone awry.
586 if (strncmp(protocol->service, "pop2", 4))
587 #else /* INET6_ENABLE */
588 if (protocol->port != 109)
589 #endif /* INET6_ENABLE */
590 #endif /* POP2_ENABLE */
591 if (num == 1 && !strncasecmp(line, "X-IMAP:", 7)) {
593 free(msgblk.headers);
598 * This code prevents fetchmail from becoming an accessory after
599 * the fact to upstream sendmails with the `E' option on. It also
600 * copes with certain brain-dead POP servers (like NT's) that pass
601 * through Unix from_ lines.
603 * Either of these bugs can result in a non-RFC822 line at the
604 * beginning of the headers. If fetchmail just passes it
605 * through, the client listener may think the message has *no*
606 * headers (since the first) line it sees doesn't look
607 * RFC822-conformant) and fake up a set.
609 * What the user would see in this case is bogus (synthesized)
610 * headers, followed by a blank line, followed by the >From,
611 * followed by the real headers, followed by a blank line,
614 * We forestall this lossage by tossing anything that looks
615 * like an escaped or passed-through From_ line in headers.
616 * These aren't RFC822 so our conscience is clear...
618 if (!strncasecmp(line, ">From ", 6) || !strncasecmp(line, "From ", 5))
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 if (!strncasecmp("Return-Path:", line, 12) && (cp = nxtaddr(line)))
684 strcpy(msgblk.return_path, cp);
693 oldlen = strlen(line);
694 msgblk.headers = xmalloc(oldlen + 1);
695 (void) strcpy(msgblk.headers, line);
697 line = msgblk.headers;
703 newlen = oldlen + strlen(line);
704 msgblk.headers = (char *) realloc(msgblk.headers, newlen + 1);
705 if (msgblk.headers == NULL) {
709 strcpy(msgblk.headers + oldlen, line);
711 line = msgblk.headers + oldlen;
715 if (!strncasecmp("From:", line, 5))
716 from_offs = (line - msgblk.headers);
717 else if (!strncasecmp("Reply-To:", line, 9))
718 reply_to_offs = (line - msgblk.headers);
719 else if (!strncasecmp("Resent-From:", line, 12))
720 resent_from_offs = (line - msgblk.headers);
721 else if (!strncasecmp("Apparently-From:", line, 16))
722 app_from_offs = (line - msgblk.headers);
723 else if (!strncasecmp("Sender:", line, 7))
724 sender_offs = (line - msgblk.headers);
725 else if (!strncasecmp("Resent-Sender:", line, 14))
726 resent_sender_offs = (line - msgblk.headers);
729 else if (!strncasecmp("Message-Id:", line, 11))
731 if (ctl->server.uidl)
735 line[IDLEN+12] = 0; /* prevent stack overflow */
736 sscanf(line+12, "%s", id);
737 if (!str_find( &ctl->newsaved, num))
739 struct idlist *new = save_str(&ctl->newsaved,id,UID_SEEN);
740 new->val.status.num = num;
744 #endif /* __UNUSED__ */
746 else if (!MULTIDROP(ctl))
749 else if (!strncasecmp("To:", line, 3)
750 || !strncasecmp("Cc:", line, 3)
751 || !strncasecmp("Bcc:", line, 4)
752 || !strncasecmp("Apparently-To:", line, 14))
754 *to_chainptr = xmalloc(sizeof(struct addrblk));
755 (*to_chainptr)->offset = (line - msgblk.headers);
756 to_chainptr = &(*to_chainptr)->next;
760 else if (!strncasecmp("Resent-To:", line, 10)
761 || !strncasecmp("Resent-Cc:", line, 10)
762 || !strncasecmp("Resent-Bcc:", line, 11))
764 *resent_to_chainptr = xmalloc(sizeof(struct addrblk));
765 (*resent_to_chainptr)->offset = (line - msgblk.headers);
766 resent_to_chainptr = &(*resent_to_chainptr)->next;
767 *resent_to_chainptr = NULL;
770 else if (ctl->server.envelope != STRING_DISABLED)
772 if (ctl->server.envelope
773 && strcasecmp(ctl->server.envelope, "Received"))
775 if (env_offs == -1 && !strncasecmp(ctl->server.envelope,
777 strlen(ctl->server.envelope)))
779 if (skipcount++ != ctl->server.envskip)
781 env_offs = (line - msgblk.headers);
784 else if (!received_for && !strncasecmp("Received:", line, 9))
786 if (skipcount++ != ctl->server.envskip)
788 received_for = parse_received(ctl, line);
795 * We want to detect this early in case there are so few headers that the
796 * dispatch logic barfs.
800 if (outlevel > O_SILENT)
802 _("message delimiter found while scanning headers\n"));
806 * Hack time. If the first line of the message was blank, with no headers
807 * (this happens occasionally due to bad gatewaying software) cons up
808 * a set of fake headers.
810 * If you modify the fake header template below, be sure you don't
811 * make either From or To address @-less, otherwise the reply_hack
812 * logic will do bad things.
814 if (msgblk.headers == (char *)NULL)
817 snprintf(buf, sizeof(buf),
820 #endif /* HAVE_SNPRINTF */
821 "From: FETCHMAIL-DAEMON\r\nTo: %s@%s\r\nSubject: Headerless mail from %s's mailbox on %s\r\n",
822 user, fetchmailhost, ctl->remotename, ctl->server.truename);
823 msgblk.headers = xstrdup(buf);
827 * We can now process message headers before reading the text.
828 * In fact we have to, as this will tell us where to forward to.
831 /* Check for MIME headers indicating possible 8-bit data */
832 ctl->mimemsg = MimeBodyType(msgblk.headers, ctl->mimedecode);
835 if (ctl->server.sdps && sdps_envfrom)
837 /* We have the real envelope return-path, stored out of band by
838 * SDPS - that's more accurate than any header is going to be.
840 strcpy(msgblk.return_path, sdps_envfrom);
843 #endif /* SDPS_ENABLE */
845 * If there is a Return-Path address on the message, this was
846 * almost certainly the MAIL FROM address given the originating
847 * sendmail. This is the best thing to use for logging the
848 * message origin (it sets up the right behavior for bounces and
849 * mailing lists). Otherwise, fall down to the next available
850 * envelope address (which is the most probable real sender).
851 * *** The order is important! ***
852 * This is especially useful when receiving mailing list
853 * messages in multidrop mode. if a local address doesn't
854 * exist, the bounce message won't be returned blindly to the
855 * author or to the list itself but rather to the list manager
856 * (ex: specified by "Sender:") which is much less annoying. This
857 * is true for most mailing list packages.
859 if( !msgblk.return_path[0] ){
861 if (resent_sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_sender_offs)));
862 else if (sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + sender_offs)));
863 else if (resent_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_from_offs)));
864 else if (from_offs >= 0 && (ap = nxtaddr(msgblk.headers + from_offs)));
865 else if (reply_to_offs >= 0 && (ap = nxtaddr(msgblk.headers + reply_to_offs)));
866 else if (app_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + app_from_offs)));
867 if (ap) strcpy( msgblk.return_path, ap );
870 /* cons up a list of local recipients */
871 msgblk.recipients = (struct idlist *)NULL;
872 accept_count = reject_count = 0;
873 /* is this a multidrop box? */
877 if (ctl->server.sdps && sdps_envto)
879 /* We have the real envelope recipient, stored out of band by
880 * SDPS - that's more accurate than any header is going to be.
882 find_server_names(sdps_envto, ctl, &msgblk.recipients);
885 #endif /* SDPS_ENABLE */
886 if (env_offs > -1) /* We have the actual envelope addressee */
887 find_server_names(msgblk.headers + env_offs, ctl, &msgblk.recipients);
888 else if (received_for)
890 * We have the Received for addressee.
891 * It has to be a mailserver address, or we
892 * wouldn't have got here.
893 * We use find_server_names() to let local
894 * hostnames go through.
896 find_server_names(received_for, ctl, &msgblk.recipients);
900 * We haven't extracted the envelope address.
901 * So check all the "Resent-To" header addresses if
902 * they exist. If and only if they don't, consider
903 * the "To" addresses.
905 register struct addrblk *nextptr;
906 if (resent_to_addrchain) {
907 /* delete the "To" chain and substitute it
908 * with the "Resent-To" list
910 while (to_addrchain) {
911 nextptr = to_addrchain->next;
913 to_addrchain = nextptr;
915 to_addrchain = resent_to_addrchain;
916 resent_to_addrchain = NULL;
918 /* now look for remaining adresses */
919 while (to_addrchain) {
920 find_server_names(msgblk.headers+to_addrchain->offset, ctl, &msgblk.recipients);
921 nextptr = to_addrchain->next;
923 to_addrchain = nextptr;
928 no_local_matches = TRUE;
929 save_str(&msgblk.recipients, run.postmaster, XMIT_ACCEPT);
930 if (outlevel >= O_DEBUG)
932 _("no local matches, forwarding to %s\n"),
936 else /* it's a single-drop box, use first localname */
937 save_str(&msgblk.recipients, ctl->localnames->id, XMIT_ACCEPT);
941 * Time to either address the message or decide we can't deliver it yet.
943 if (ctl->errcount > olderrs) /* there were DNS errors above */
945 if (outlevel >= O_DEBUG)
947 _("forwarding and deletion suppressed due to DNS errors\n"));
948 free(msgblk.headers);
949 free_str_list(&msgblk.recipients);
950 return(PS_TRANSIENT);
954 /* set up stuffline() so we can deliver the message body through it */
955 if ((n = open_sink(ctl, &msgblk,
956 &good_addresses, &bad_addresses)) != PS_SUCCESS)
958 free(msgblk.headers);
959 free_str_list(&msgblk.recipients);
966 * Some server/sendmail combinations cause problems when our
967 * synthetic Received line is before the From header. Cope
970 if ((rcv = strstr(msgblk.headers, "Received:")) == (char *)NULL)
971 rcv = msgblk.headers;
972 /* handle ">Received:" lines too */
973 while (rcv > msgblk.headers && rcv[-1] != '\n')
975 if (rcv > msgblk.headers)
980 n = stuffline(ctl, msgblk.headers);
983 if (!run.invisible && n != -1)
985 /* utter any per-message Received information we need here */
986 sprintf(buf, "Received: from %s\r\n", ctl->server.truename);
987 n = stuffline(ctl, buf);
991 * This header is technically invalid under RFC822.
992 * POP3, IMAP, etc. are not legal mail-parameter values.
994 * We used to include ctl->remotename in this log line,
995 * but this can be secure information that would be bad
998 sprintf(buf, "\tby %s with %s (fetchmail-%s)\r\n",
1002 n = stuffline(ctl, buf);
1006 if (good_addresses == 0)
1009 "for %s@%s (by default); ",
1010 user, ctl->destaddr);
1012 else if (good_addresses == 1)
1014 for (idp = msgblk.recipients; idp; idp = idp->next)
1015 if (idp->val.status.mark == XMIT_ACCEPT)
1016 break; /* only report first address */
1017 if (strchr(idp->id, '@'))
1018 sprintf(buf+1, "for %s", idp->id);
1021 * This could be a bit misleading, as destaddr is
1022 * the forwarding host rather than the actual
1023 * destination. Most of the time they coincide.
1025 sprintf(buf+1, "for %s@%s", idp->id, ctl->destaddr);
1026 sprintf(buf+strlen(buf), " (%s); ",
1027 MULTIDROP(ctl) ? "multi-drop" : "single-drop");
1032 strcat(buf, rfc822timestamp());
1033 strcat(buf, "\r\n");
1034 n = stuffline(ctl, buf);
1040 n = stuffline(ctl, rcv); /* ship out rest of msgblk.headers */
1044 report(stdout, _("writing RFC822 msgblk.headers\n"));
1046 free(msgblk.headers);
1047 free_str_list(&msgblk.recipients);
1050 else if ((run.poll_interval == 0 || nodetach) && outlevel >= O_VERBOSE && isatty(2))
1053 /* write error notifications */
1054 if (no_local_matches || has_nuls || bad_addresses)
1057 char errhd[USERNAMELEN + POPBUFSIZE], *errmsg;
1060 (void) strcpy(errhd, "X-Fetchmail-Warning: ");
1061 if (no_local_matches)
1063 if (reject_count != 1)
1064 strcat(errhd, _("no recipient addresses matched declared local names"));
1067 for (idp = msgblk.recipients; idp; idp = idp->next)
1068 if (idp->val.status.mark == XMIT_REJECT)
1070 sprintf(errhd+strlen(errhd), _("recipient address %s didn't match any local name"), idp->id);
1076 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1077 strcat(errhd, "; ");
1078 strcat(errhd, _("message has embedded NULs"));
1083 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1084 strcat(errhd, "; ");
1085 strcat(errhd, _("SMTP listener rejected local recipient addresses: "));
1086 errlen = strlen(errhd);
1087 for (idp = msgblk.recipients; idp; idp = idp->next)
1088 if (idp->val.status.mark == XMIT_RCPTBAD)
1089 errlen += strlen(idp->id) + 2;
1091 xalloca(errmsg, char *, errlen+3);
1092 (void) strcpy(errmsg, errhd);
1093 for (idp = msgblk.recipients; idp; idp = idp->next)
1094 if (idp->val.status.mark == XMIT_RCPTBAD)
1096 strcat(errmsg, idp->id);
1098 strcat(errmsg, ", ");
1103 strcat(errmsg, "\r\n");
1105 /* ship out the error line */
1106 stuffline(ctl, errmsg);
1109 /* issue the delimiter line */
1114 stuffline(ctl, buf);
1116 free(msgblk.headers);
1117 free_str_list(&msgblk.recipients);
1118 return(headers_ok ? PS_SUCCESS : PS_TRUNCATED);
1121 static int readbody(int sock, struct query *ctl, flag forward, int len)
1122 /* read and dispose of a message body presented on sock */
1123 /* ctl: query control record */
1124 /* sock: to which the server is connected */
1125 /* len: length of message */
1126 /* forward: TRUE to forward */
1129 unsigned char buf[MSGBUFSIZE+4];
1130 unsigned char *inbufp = buf;
1131 flag issoftline = FALSE;
1134 * Pass through the text lines in the body.
1136 * Yes, this wants to be ||, not &&. The problem is that in the most
1137 * important delimited protocol, POP3, the length is not reliable.
1138 * As usual, the problem is Microsoft brain damage; see FAQ item S2.
1139 * So, for delimited protocols we need to ignore the length here and
1140 * instead drop out of the loop with a break statement when we see
1141 * the message delimiter.
1143 while (protocol->delimited || len > 0)
1145 set_timeout(mytimeout);
1146 if ((linelen = SockRead(sock, inbufp, sizeof(buf)-4-(inbufp-buf)))==-1)
1154 /* write the message size dots */
1157 sizeticker += linelen;
1158 while (sizeticker >= SIZETICKER)
1160 if ((run.poll_interval == 0 || nodetach) && outlevel > O_SILENT && isatty(1))
1165 sizeticker -= SIZETICKER;
1170 /* check for end of message */
1171 if (protocol->delimited && *inbufp == '.')
1173 if (inbufp[1] == '\r' && inbufp[2] == '\n' && inbufp[3] == '\0')
1175 else if (inbufp[1] == '\n' && inbufp[2] == '\0')
1178 msglen--; /* subtract the size of the dot escape */
1183 if (ctl->mimedecode && (ctl->mimemsg & MSG_NEEDS_DECODE)) {
1184 issoftline = UnMimeBodyline(&inbufp, protocol->delimited, issoftline);
1185 if (issoftline && (sizeof(buf)-1-(inbufp-buf) < 200))
1188 * Soft linebreak, but less than 200 bytes left in
1189 * input buffer. Rather than doing a buffer overrun,
1190 * ignore the soft linebreak, NL-terminate data and
1191 * deliver what we have now.
1192 * (Who writes lines longer than 2K anyway?)
1194 *inbufp = '\n'; *(inbufp+1) = '\0';
1199 /* ship out the text line */
1200 if (forward && (!issoftline))
1205 /* guard against very long lines */
1206 buf[MSGBUFSIZE+1] = '\r';
1207 buf[MSGBUFSIZE+2] = '\n';
1208 buf[MSGBUFSIZE+3] = '\0';
1210 n = stuffline(ctl, buf);
1214 report(stdout, _("writing message text\n"));
1218 else if (outlevel >= O_VERBOSE && isatty(1))
1231 kerberos_auth (socket, canonical)
1232 /* authenticate to the server host using Kerberos V4 */
1233 int socket; /* socket to server host */
1234 #if defined(__FreeBSD__) || defined(__OpenBSD__)
1235 char *canonical; /* server name */
1237 const char *canonical; /* server name */
1240 char * host_primary;
1244 Key_schedule schedule;
1247 xalloca(ticket, KTEXT, sizeof (KTEXT_ST));
1248 rem = (krb_sendauth (0L, socket, ticket, "pop",
1250 ((char *) (krb_realmofhost (canonical))),
1251 ((unsigned long) 0),
1255 ((struct sockaddr_in *) 0),
1256 ((struct sockaddr_in *) 0),
1258 if (rem != KSUCCESS)
1260 report(stderr, _("kerberos error %s\n"), (krb_get_err_text (rem)));
1261 return (PS_AUTHFAIL);
1265 #endif /* KERBEROS_V4 */
1268 static int kerberos5_auth(socket, canonical)
1269 /* authenticate to the server host using Kerberos V5 */
1270 int socket; /* socket to server host */
1271 const char *canonical; /* server name */
1273 krb5_error_code retval;
1274 krb5_context context;
1276 krb5_principal client = NULL, server = NULL;
1277 krb5_error *err_ret = NULL;
1279 krb5_auth_context auth_context = NULL;
1281 krb5_init_context(&context);
1282 krb5_init_ets(context);
1283 krb5_auth_con_init(context, &auth_context);
1285 if (retval = krb5_cc_default(context, &ccdef)) {
1286 report(stderr, "krb5_cc_default: %s\n", error_message(retval));
1290 if (retval = krb5_cc_get_principal(context, ccdef, &client)) {
1291 report(stderr, "krb5_cc_get_principal: %s\n", error_message(retval));
1295 if (retval = krb5_sname_to_principal(context, canonical, "pop",
1298 report(stderr, "krb5_sname_to_principal: %s\n", error_message(retval));
1302 retval = krb5_sendauth(context, &auth_context, (krb5_pointer) &socket,
1303 "KPOPV1.0", client, server,
1304 AP_OPTS_MUTUAL_REQUIRED,
1305 NULL, /* no data to checksum */
1306 0, /* no creds, use ccache instead */
1310 NULL); /* don't need reply */
1312 krb5_free_principal(context, server);
1313 krb5_free_principal(context, client);
1314 krb5_auth_con_free(context, auth_context);
1318 if (err_ret && err_ret->e_text) {
1319 report(stderr, _("krb5_sendauth: %s [server says '%*s'] \n"),
1320 error_message(retval),
1323 if (err_ret && err_ret->text.length) {
1324 report(stderr, _("krb5_sendauth: %s [server says '%*s'] \n"),
1325 error_message(retval),
1326 err_ret->text.length,
1327 err_ret->text.data);
1329 krb5_free_error(context, err_ret);
1331 report(stderr, "krb5_sendauth: %s\n", error_message(retval));
1337 #endif /* KERBEROS_V5 */
1339 static void clean_skipped_list(struct idlist **skipped_list)
1340 /* struct "idlist" contains no "prev" ptr; we must remove unused items first */
1342 struct idlist *current=NULL, *prev=NULL, *tmp=NULL, *head=NULL;
1343 prev = current = head = *skipped_list;
1349 /* if item has no reference, remove it */
1350 if (current && current->val.status.mark == 0)
1352 if (current == head) /* remove first item (head) */
1354 head = current->next;
1355 if (current->id) free(current->id);
1357 prev = current = head;
1359 else /* remove middle/last item */
1361 tmp = current->next;
1363 if (current->id) free(current->id);
1368 else /* skip this item */
1371 current = current->next;
1375 *skipped_list = head;
1378 static void send_size_warnings(struct query *ctl)
1379 /* send warning mail with skipped msg; reset msg count when user notified */
1382 int msg_to_send = FALSE;
1383 struct idlist *head=NULL, *current=NULL;
1384 int max_warning_poll_count;
1385 #define OVERHD "Subject: Fetchmail oversized-messages warning.\r\n\r\nThe following oversized messages remain on the mail server %s:"
1387 head = ctl->skipped;
1391 /* don't start a notification message unless we need to */
1392 for (current = head; current; current = current->next)
1393 if (current->val.status.num == 0 && current->val.status.mark)
1399 * There's no good way to recover if we can't send notification mail,
1400 * but it's not a disaster, either, since the skipped mail will not
1403 if (open_warning_by_mail(ctl, (struct msgblk *)NULL))
1405 stuff_warning(ctl, OVERHD, ctl->server.pollname);
1407 if (run.poll_interval == 0)
1408 max_warning_poll_count = 0;
1410 max_warning_poll_count = ctl->warnings/run.poll_interval;
1412 /* parse list of skipped msg, adding items to the mail */
1413 for (current = head; current; current = current->next)
1415 if (current->val.status.num == 0 && current->val.status.mark)
1417 nbr = current->val.status.mark;
1418 size = atoi(current->id);
1420 _("\t%d msg %d octets long skipped by fetchmail.\r\n"),
1423 current->val.status.num++;
1424 current->val.status.mark = 0;
1426 if (current->val.status.num >= max_warning_poll_count)
1427 current->val.status.num = 0;
1430 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1434 static int do_session(ctl, proto, maxfetch)
1435 /* retrieve messages from server using given protocol method table */
1436 struct query *ctl; /* parsed options with merged-in defaults */
1437 const struct method *proto; /* protocol method table */
1438 const int maxfetch; /* maximum number of messages to fetch */
1441 #ifdef HAVE_VOLATILE
1442 volatile int ok, mailserver_socket = -1; /* pacifies -Wall */
1444 int ok, mailserver_socket = -1;
1445 #endif /* HAVE_VOLATILE */
1447 void (*pipesave)(int);
1448 void (*alrmsave)(int);
1449 struct idlist *current=NULL, *tmp=NULL;
1452 ctl->server.base_protocol = protocol;
1456 tag[0] = '\0'; /* nuke any tag hanging out from previous query */
1459 /* set up the server-nonresponse timeout */
1460 alrmsave = signal(SIGALRM, timeout_handler);
1461 mytimeout = ctl->server.timeout;
1463 /* set up the broken-pipe timeout */
1464 pipesave = signal(SIGPIPE, sigpipe_handler);
1466 if ((js = setjmp(restart)))
1468 #ifdef HAVE_SIGPROCMASK
1470 * Don't rely on setjmp() to restore the blocked-signal mask.
1471 * It does this under BSD but is required not to under POSIX.
1473 * If your Unix doesn't have sigprocmask, better hope it has
1474 * BSD-like behavior. Otherwise you may see fetchmail get
1475 * permanently wedged after a second timeout on a bad read,
1476 * because alarm signals were blocked after the first.
1480 sigfillset(&allsigs);
1481 sigprocmask(SIG_UNBLOCK, &allsigs, NULL);
1482 #endif /* HAVE_SIGPROCMASK */
1484 if (js == THROW_SIGPIPE)
1487 _("SIGPIPE thrown from an MDA or a stream socket error\n"));
1491 else if (js == THROW_TIMEOUT)
1493 if (phase == OPEN_WAIT)
1495 _("timeout after %d seconds waiting to connect to server %s.\n"),
1496 ctl->server.timeout, ctl->server.pollname);
1497 else if (phase == SERVER_WAIT)
1499 _("timeout after %d seconds waiting for server %s.\n"),
1500 ctl->server.timeout, ctl->server.pollname);
1501 else if (phase == FORWARDING_WAIT)
1503 _("timeout after %d seconds waiting for %s.\n"),
1504 ctl->server.timeout,
1505 ctl->mda ? "MDA" : "SMTP");
1506 else if (phase == LISTENER_WAIT)
1508 _("timeout after %d seconds waiting for listener to respond.\n"), ctl->server.timeout);
1511 _("timeout after %d seconds.\n"), ctl->server.timeout);
1514 * If we've exceeded our threshold for consecutive timeouts,
1515 * try to notify the user, then mark the connection wedged.
1516 * Don't do this if the connection can idle, though; idle
1517 * timeouts just mean the frequency of mail is low.
1519 if (!ctl->idle && timeoutcount > MAX_TIMEOUTS
1520 && !open_warning_by_mail(ctl, (struct msgblk *)NULL))
1523 _("Subject: fetchmail sees repeated timeouts\r\n"));
1525 _("Fetchmail saw more than %d timeouts while attempting to get mail from %s@%s.\r\n"),
1528 ctl->server.truename);
1530 _("This could mean that your mailserver is stuck, or that your SMTP\r\n" \
1531 "server is wedged, or that your mailbox file on the server has been\r\n" \
1532 "corrupted by a server error. You can run `fetchmail -v -v' to\r\n" \
1533 "diagnose the problem.\r\n\r\n" \
1534 "Fetchmail won't poll this mailbox again until you restart it.\r\n"));
1535 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1542 /* try to clean up all streams */
1544 if (ctl->smtp_socket != -1)
1545 SockClose(ctl->smtp_socket);
1546 if (mailserver_socket != -1)
1547 SockClose(mailserver_socket);
1551 char buf[MSGBUFSIZE+1], *realhost;
1552 int len, num, count, new, bytes, deletions = 0, *msgsizes = NULL;
1554 int fetches, dispatches, oldphase;
1555 #else /* INET6_ENABLE */
1556 int port, fetches, dispatches, oldphase;
1557 #endif /* INET6_ENABLE */
1560 /* execute pre-initialization command, if any */
1561 if (ctl->preconnect && (ok = system(ctl->preconnect)))
1564 _("pre-connection command failed with status %d\n"), ok);
1569 /* open a socket to the mail server */
1572 set_timeout(mytimeout);
1575 port = ctl->server.port ? ctl->server.port : ( ctl->use_ssl ? protocol->sslport : protocol->port );
1577 port = ctl->server.port ? ctl->server.port : protocol->port;
1579 #endif /* !INET6_ENABLE */
1580 realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname;
1582 /* allow time for the port to be set up if we have a plugin */
1583 if (ctl->server.plugin)
1586 if ((mailserver_socket = SockOpen(realhost,
1587 ctl->server.service ? ctl->server.service : protocol->service,
1588 ctl->server.netsec, ctl->server.plugin)) == -1)
1589 #else /* INET6_ENABLE */
1590 if ((mailserver_socket = SockOpen(realhost, port, NULL, ctl->server.plugin)) == -1)
1591 #endif /* INET6_ENABLE */
1593 char errbuf[BUFSIZ];
1596 #ifdef HAVE_RES_SEARCH
1597 if (err_no != 0 && h_errno != 0)
1598 report(stderr, _("fetchmail: internal inconsistency\n"));
1601 * Avoid generating a bogus error every poll cycle when we're
1602 * in daemon mode but the connection to the outside world
1605 if (!((err_no == EHOSTUNREACH || err_no == ENETUNREACH)
1606 && run.poll_interval))
1608 report_build(stderr, _("fetchmail: %s connection to %s failed"),
1609 protocol->name, ctl->server.pollname);
1610 #ifdef HAVE_RES_SEARCH
1613 if (h_errno == HOST_NOT_FOUND)
1614 strcpy(errbuf, _("host is unknown."));
1615 else if (h_errno == NO_ADDRESS)
1616 strcpy(errbuf, _("name is valid but has no IP address."));
1617 else if (h_errno == NO_RECOVERY)
1618 strcpy(errbuf, _("unrecoverable name server error."));
1619 else if (h_errno == TRY_AGAIN)
1620 strcpy(errbuf, _("temporary name server error."));
1622 sprintf(errbuf, _("unknown DNS error %d."), h_errno);
1625 #endif /* HAVE_RES_SEARCH */
1626 strcpy(errbuf, strerror(err_no));
1627 report_complete(stderr, ": %s\n", errbuf);
1631 * Don't use this. It was an attempt to address Debian bug
1632 * #47143 (Notify user by mail when pop server nonexistent).
1633 * Trouble is, that doesn't work; you trip over the case
1634 * where your SLIP or PPP link is down...
1636 /* warn the system administrator */
1637 if (open_warning_by_mail(ctl, (struct msgblk *)NULL) == 0)
1639 #define OPENFAIL "Subject: Fetchmail unreachable-server warning.\r\n\r\nFetchmail could not reach the mail server %s:"
1640 stuff_warning(ctl, OPENFAIL, ctl->server.pollname);
1641 stuff_warning(ctl, errbuf, ctl->server.pollname);
1642 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1647 #endif /* INET6_ENABLE */
1657 /* perform initial SSL handshake on open connection */
1658 /* Note: We pass the realhost name over for certificate
1659 verification. We may want to make this configurable */
1660 if (ctl->use_ssl && SSLOpen(mailserver_socket,ctl->sslkey,ctl->sslcert,realhost) == -1)
1662 report(stderr, "SSL connection failed.");
1668 if (ctl->server.preauthenticate == A_KERBEROS_V4)
1670 set_timeout(mytimeout);
1671 ok = kerberos_auth(mailserver_socket, ctl->server.truename);
1676 #endif /* KERBEROS_V4 */
1679 if (ctl->server.preauthenticate == A_KERBEROS_V5)
1681 set_timeout(mytimeout);
1682 ok = kerberos5_auth(mailserver_socket, ctl->server.truename);
1687 #endif /* KERBEROS_V5 */
1689 /* accept greeting message from mail server */
1690 ok = (protocol->parse_response)(mailserver_socket, buf);
1694 /* try to get authorized to fetch mail */
1695 stage = STAGE_GETAUTH;
1696 if (protocol->getauth)
1698 if (protocol->password_canonify)
1699 (protocol->password_canonify)(shroud, ctl->password, PASSWORDLEN);
1701 strcpy(shroud, ctl->password);
1703 ok = (protocol->getauth)(mailserver_socket, ctl, buf);
1706 if (ok == PS_LOCKBUSY)
1707 report(stderr, _("Lock-busy error on %s@%s\n"),
1709 ctl->server.truename);
1710 else if (ok == PS_AUTHFAIL)
1712 report(stderr, _("Authorization failure on %s@%s\n"),
1714 ctl->server.truename);
1717 * If we're running in background, try to mail the
1718 * calling user a heads-up about the authentication
1719 * failure once it looks like this isn't a fluke
1720 * due to the server being temporarily inaccessible.
1722 if (run.poll_interval
1723 && ctl->authfailcount++ > MAX_AUTHFAILS
1724 && !open_warning_by_mail(ctl, (struct msgblk *)NULL))
1727 _("Subject: fetchmail authentication failed\r\n"));
1729 _("Fetchmail could not get mail from %s@%s.\r\n"),
1731 ctl->server.truename);
1733 _("The attempt to get authorization failed.\r\n" \
1734 "This probably means your password is invalid, but POP3 servers have\r\n" \
1735 "other failure modes that fetchmail cannot distinguish from this\r\n" \
1736 "because they don't send useful error messages on login failure.\r\n"));
1737 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1742 report(stderr, _("Unknown login or authentication error on %s@%s\n"),
1744 ctl->server.truename);
1750 ctl->errcount = fetches = 0;
1752 /* now iterate over each folder selected */
1753 for (idp = ctl->mailboxes; idp; idp = idp->next)
1760 /* reset timeout, in case we did an IDLE */
1761 mytimeout = ctl->server.timeout;
1763 if (outlevel >= O_DEBUG)
1766 report(stdout, _("selecting or re-polling folder %s\n"), idp->id);
1768 report(stdout, _("selecting or re-polling default folder\n"));
1771 /* compute # of messages and number of new messages waiting */
1772 stage = STAGE_GETRANGE;
1773 ok = (protocol->getrange)(mailserver_socket, ctl, idp->id, &count, &new, &bytes);
1777 /* show user how many messages we downloaded */
1779 (void) sprintf(buf, _("%s at %s (folder %s)"),
1780 ctl->remotename, ctl->server.truename, idp->id);
1782 (void) sprintf(buf, _("%s at %s"),
1783 ctl->remotename, ctl->server.truename);
1784 if (outlevel > O_SILENT)
1786 if (count == -1) /* only used for ETRN */
1787 report(stdout, _("Polling %s\n"), ctl->server.truename);
1788 else if (count != 0)
1790 if (new != -1 && (count - new) > 0)
1791 report_build(stdout, _("%d %s (%d seen) for %s"),
1792 count, count > 1 ? _("messages") :
1796 report_build(stdout, _("%d %s for %s"),
1797 count, count > 1 ? _("messages") :
1800 report_complete(stdout, ".\n");
1802 report_complete(stdout, _(" (%d octets).\n"), bytes);
1806 /* these are pointless in normal daemon mode */
1807 if (pass == 1 && (run.poll_interval == 0 || outlevel >= O_VERBOSE))
1808 report(stdout, _("No mail for %s\n"), buf);
1812 /* very important, this is where we leave the do loop */
1818 if (new == -1 || ctl->fetchall)
1820 fetches = new; /* set error status ccorrectly */
1822 * There used to be a `got noerror' here, but this
1823 * prevneted checking of multiple folders. This
1824 * comment is a reminder in case I introduced some
1825 * subtle bug by removing it...
1830 flag force_retrieval;
1833 * What forces this code is that in POP2 and
1834 * IMAP2bis you can't fetch a message without
1835 * having it marked `seen'. In POP3 and IMAP4, on the
1836 * other hand, you can (peek_capable is set by
1837 * each driver module to convey this; it's not a
1838 * method constant because of the difference between
1839 * IMAP2bis and IMAP4, and because POP3 doesn't peek
1840 * if fetchall is on).
1842 * The result of being unable to peek is that if there's
1843 * any kind of transient error (DNS lookup failure, or
1844 * sendmail refusing delivery due to process-table limits)
1845 * the message will be marked "seen" on the server without
1846 * having been delivered. This is not a big problem if
1847 * fetchmail is running in foreground, because the user
1848 * will see a "skipped" message when it next runs and get
1851 * But in daemon mode this leads to the message
1852 * being silently ignored forever. This is not
1855 * We compensate for this by checking the error
1856 * count from the previous pass and forcing all
1857 * messages to be considered new if it's nonzero.
1859 force_retrieval = !peek_capable && (ctl->errcount > 0);
1862 * We need the size of each message before it's
1863 * loaded in order to pass it to the ESMTP SIZE
1864 * option. If the protocol has a getsizes method,
1865 * we presume this means it doesn't get reliable
1866 * sizes from message fetch responses.
1868 if (proto->getsizes)
1872 xalloca(msgsizes, int *, sizeof(int) * count);
1873 for (i = 0; i < count; i++)
1876 stage = STAGE_GETSIZES;
1877 ok = (proto->getsizes)(mailserver_socket, count, msgsizes);
1884 for (i = 0; i < count; i++)
1885 bytes += msgsizes[i];
1889 /* read, forward, and delete messages */
1890 stage = STAGE_FETCH;
1891 for (num = 1; num <= count; num++)
1893 flag toolarge = NUM_NONZERO(ctl->limit)
1894 && msgsizes && (msgsizes[num-1] > ctl->limit);
1895 flag oldmsg = (!new) || (protocol->is_old && (protocol->is_old)(mailserver_socket,ctl,num));
1896 flag fetch_it = !toolarge
1897 && (ctl->fetchall || force_retrieval || !oldmsg);
1898 flag suppress_delete = FALSE;
1899 flag suppress_forward = FALSE;
1900 flag suppress_readbody = FALSE;
1901 flag retained = FALSE;
1904 * This check copes with Post Office/NT's
1905 * annoying habit of randomly prepending bogus
1906 * LIST items of length -1. Patrick Audley
1907 * <paudley@pobox.com> tells us: LIST shows a
1908 * size of -1, RETR and TOP return "-ERR
1909 * System error - couldn't open message", and
1910 * DELE succeeds but doesn't actually delete
1913 if (msgsizes && msgsizes[num-1] == -1)
1915 if (outlevel >= O_VERBOSE)
1917 _("Skipping message %d, length -1\n"),
1923 * We may want to reject this message if it's old
1924 * or oversized, and we're not forcing retrieval.
1928 if (outlevel > O_SILENT)
1930 report_build(stdout, _("skipping message %d"), num);
1931 if (toolarge && !check_only)
1936 /* convert sz to string */
1937 sprintf(size, "%d", msgsizes[num-1]);
1939 /* build a list of skipped messages
1940 * val.id = size of msg (string cnvt)
1941 * val.status.num = warning_poll_count
1942 * val.status.mask = nbr of msg this size
1945 current = ctl->skipped;
1947 /* initialise warning_poll_count to the
1948 * current value so that all new msg will
1949 * be included in the next mail
1951 cnt = current? current->val.status.num : 0;
1953 /* if entry exists, increment the count */
1955 str_in_list(¤t, size, FALSE))
1958 current = current->next)
1960 if (strcmp(current->id, size) == 0)
1962 current->val.status.mark++;
1967 /* otherwise, create a new entry */
1968 /* initialise with current poll count */
1971 tmp = save_str(&ctl->skipped, size, 1);
1972 tmp->val.status.num = cnt;
1975 report_build(stdout, _(" (oversized, %d octets)"),
1982 flag wholesize = !protocol->fetch_body;
1984 /* request a message */
1985 ok = (protocol->fetch_headers)(mailserver_socket,ctl,num, &len);
1989 /* -1 means we didn't see a size in the response */
1990 if (len == -1 && msgsizes)
1992 len = msgsizes[num - 1];
1996 if (outlevel > O_SILENT)
1998 report_build(stdout, _("reading message %d of %d"),
2002 report_build(stdout, _(" (%d %soctets)"),
2003 len, wholesize ? "" : _("header "));
2004 if (outlevel >= O_VERBOSE)
2005 report_complete(stdout, "\n");
2007 report_complete(stdout, " ");
2011 * Read the message headers and ship them to the
2014 ok = readheaders(mailserver_socket, len, msgsizes[num-1],
2016 if (ok == PS_RETAINED)
2017 suppress_forward = retained = TRUE;
2018 else if (ok == PS_TRANSIENT)
2019 suppress_delete = suppress_forward = TRUE;
2020 else if (ok == PS_REFUSED)
2021 suppress_forward = TRUE;
2022 else if (ok == PS_TRUNCATED)
2023 suppress_readbody = TRUE;
2028 * If we're using IMAP4 or something else that
2029 * can fetch headers separately from bodies,
2030 * it's time to request the body now. This
2031 * fetch may be skipped if we got an anti-spam
2032 * or other PS_REFUSED error response during
2035 if (protocol->fetch_body && !suppress_readbody)
2037 if (outlevel >= O_VERBOSE && isatty(1))
2039 fputc('\n', stdout);
2043 if ((ok = (protocol->trail)(mailserver_socket, ctl, num)))
2046 if (!suppress_forward)
2048 if ((ok=(protocol->fetch_body)(mailserver_socket,ctl,num,&len)))
2051 * Work around a bug in Novell's
2052 * broken GroupWise IMAP server;
2053 * its body FETCH response is missing
2054 * the required length for the data
2055 * string. This violates RFC2060.
2058 len = msgsizes[num-1] - msglen;
2059 if (outlevel > O_SILENT && !wholesize)
2060 report_complete(stdout,
2061 _(" (%d body octets) "), len);
2065 /* process the body now */
2068 if (suppress_readbody)
2070 /* When readheaders returns PS_TRUNCATED,
2071 the body (which has no content
2072 has already been read by readheaders,
2073 so we say readbody returned PS_SUCCESS */
2078 ok = readbody(mailserver_socket,
2083 if (ok == PS_TRANSIENT)
2084 suppress_delete = suppress_forward = TRUE;
2088 /* tell server we got it OK and resynchronize */
2089 if (protocol->trail)
2091 if (outlevel >= O_VERBOSE && isatty(1))
2093 fputc('\n', stdout);
2097 ok = (protocol->trail)(mailserver_socket, ctl, num);
2103 /* count # messages forwarded on this pass */
2104 if (!suppress_forward)
2108 * Check to see if the numbers matched?
2110 * Yes, some servers foo this up horribly.
2111 * All IMAP servers seem to get it right, and
2112 * so does Eudora QPOP at least in 2.xx
2115 * Microsoft Exchange gets it completely
2116 * wrong, reporting compressed rather than
2117 * actual sizes (so the actual length of
2118 * message is longer than the reported size).
2119 * Another fine example of Microsoft brain death!
2121 * Some older POP servers, like the old UCB
2122 * POP server and the pre-QPOP QUALCOMM
2123 * versions, report a longer size in the LIST
2124 * response than actually gets shipped up.
2125 * It's unclear what is going on here, as the
2126 * QUALCOMM server (at least) seems to be
2127 * reporting the on-disk size correctly.
2129 if (msgsizes && msglen != msgsizes[num-1])
2131 if (outlevel >= O_DEBUG)
2133 _("message %d was not the expected length (%d actual != %d expected)\n"),
2134 num, msglen, msgsizes[num-1]);
2137 /* end-of-message processing starts here */
2138 if (!close_sink(ctl, &msgblk, !suppress_forward))
2141 suppress_delete = TRUE;
2147 * At this point in flow of control, either
2148 * we've bombed on a protocol error or had
2149 * delivery refused by the SMTP server
2150 * (unlikely -- I've never seen it) or we've
2151 * seen `accepted for delivery' and the
2152 * message is shipped. It's safe to mark the
2153 * message seen and delete it on the server
2157 /* tell the UID code we've seen this */
2162 for (sdp = ctl->newsaved; sdp; sdp = sdp->next)
2163 if (sdp->val.status.num == num)
2164 sdp->val.status.mark = UID_SEEN;
2167 /* maybe we delete this message now? */
2170 if (outlevel > O_SILENT)
2171 report(stdout, _(" retained\n"));
2173 else if (protocol->delete
2175 && (fetch_it ? !ctl->keep : ctl->flush))
2178 if (outlevel > O_SILENT)
2179 report_complete(stdout, _(" flushed\n"));
2180 ok = (protocol->delete)(mailserver_socket, ctl, num);
2184 delete_str(&ctl->newsaved, num);
2185 #endif /* POP3_ENABLE */
2187 else if (outlevel > O_SILENT)
2188 report_complete(stdout, _(" not flushed\n"));
2190 /* perhaps this as many as we're ready to handle */
2191 if (maxfetch && maxfetch <= fetches && fetches < count)
2193 report(stdout, _("fetchlimit %d reached; %d messages left on server\n"),
2194 maxfetch, count - fetches);
2200 if (!check_only && ctl->skipped
2201 && run.poll_interval > 0 && !nodetach)
2203 clean_skipped_list(&ctl->skipped);
2204 send_size_warnings(ctl);
2209 * Only re-poll if we either had some actual forwards or,
2210 * are idling, and allowed deletions and had no errors.
2211 * Otherwise it is far too easy to get into infinite loops.
2213 ((dispatches || ctl->idle) && protocol->retry && !ctl->keep && !ctl->errcount);
2217 /* ordinary termination with no errors -- officially log out */
2218 ok = (protocol->logout_cmd)(mailserver_socket, ctl);
2220 * Hmmmm...arguably this would be incorrect if we had fetches but
2221 * no dispatches (due to oversized messages, etc.)
2224 ok = (fetches > 0) ? PS_SUCCESS : PS_NOMAIL;
2225 SockClose(mailserver_socket);
2229 /* we only get here on error */
2230 if (ok != 0 && ok != PS_SOCKET)
2232 stage = STAGE_LOGOUT;
2233 (protocol->logout_cmd)(mailserver_socket, ctl);
2235 SockClose(mailserver_socket);
2238 msg = (const char *)NULL; /* sacrifice to -Wall */
2245 msg = _("authorization");
2248 msg = _("missing or bad RFC822 header");
2254 msg = _("client/server synchronization");
2257 msg = _("client/server protocol");
2260 msg = _("lock busy on server");
2263 msg = _("SMTP transaction");
2266 msg = _("DNS lookup");
2269 report(stderr, _("undefined error\n"));
2272 /* no report on PS_MAXFETCH or PS_UNDEFINED */
2273 if (ok==PS_SOCKET || ok==PS_AUTHFAIL || ok==PS_SYNTAX
2274 || ok==PS_IOERR || ok==PS_ERROR || ok==PS_PROTOCOL
2275 || ok==PS_LOCKBUSY || ok==PS_SMTP || ok==PS_DNS)
2276 report(stderr, _("%s error while fetching from %s\n"), msg, ctl->server.pollname);
2279 /* execute post-initialization command, if any */
2280 if (ctl->postconnect && (ok = system(ctl->postconnect)))
2282 report(stderr, _("post-connection command failed with status %d\n"), ok);
2283 if (ok == PS_SUCCESS)
2287 signal(SIGALRM, alrmsave);
2288 signal(SIGPIPE, pipesave);
2292 int do_protocol(ctl, proto)
2293 /* retrieve messages from server using given protocol method table */
2294 struct query *ctl; /* parsed options with merged-in defaults */
2295 const struct method *proto; /* protocol method table */
2300 if (ctl->server.preauthenticate == A_KERBEROS_V4)
2302 report(stderr, _("Kerberos V4 support not linked.\n"));
2305 #endif /* KERBEROS_V4 */
2308 if (ctl->server.preauthenticate == A_KERBEROS_V5)
2310 report(stderr, _("Kerberos V5 support not linked.\n"));
2313 #endif /* KERBEROS_V5 */
2315 /* lacking methods, there are some options that may fail */
2318 /* check for unsupported options */
2321 _("Option --flush is not supported with %s\n"),
2325 else if (ctl->fetchall) {
2327 _("Option --all is not supported with %s\n"),
2332 if (!proto->getsizes && NUM_SPECIFIED(ctl->limit))
2335 _("Option --limit is not supported with %s\n"),
2341 * If no expunge limit or we do expunges within the driver,
2342 * then just do one session, passing in any fetchlimit.
2344 if (proto->retry || !NUM_SPECIFIED(ctl->expunge))
2345 return(do_session(ctl, proto, NUM_VALUE_OUT(ctl->fetchlimit)));
2347 * There's an expunge limit, and it isn't handled in the driver itself.
2348 * OK; do multiple sessions, each fetching a limited # of messages.
2349 * Stop if the total count of retrieved messages exceeds ctl->fetchlimit
2350 * (if it was nonzero).
2356 int expunge = NUM_VALUE_OUT(ctl->expunge);
2357 int fetchlimit = NUM_VALUE_OUT(ctl->fetchlimit);
2360 ok = do_session(ctl, proto, expunge);
2361 totalcount += expunge;
2362 if (NUM_SPECIFIED(ctl->fetchlimit) && totalcount >= fetchlimit)
2364 if (ok != PS_LOCKBUSY)
2366 else if (lockouts >= MAX_LOCKOUTS)
2368 else /* ok == PS_LOCKBUSY */
2371 * Allow time for the server lock to release. if we
2372 * don't do this, we'll often hit a locked-mailbox
2373 * condition and fail.
2379 (ok == PS_MAXFETCH || ok == PS_LOCKBUSY);
2385 #if defined(HAVE_STDARG_H)
2386 void gen_send(int sock, const char *fmt, ... )
2388 void gen_send(sock, fmt, va_alist)
2389 int sock; /* socket to which server is connected */
2390 const char *fmt; /* printf-style format */
2393 /* assemble command in printf(3) style and send to the server */
2395 char buf [MSGBUFSIZE+1];
2398 if (protocol->tagged)
2399 (void) sprintf(buf, "%s ", GENSYM);
2403 #if defined(HAVE_STDARG_H)
2408 #ifdef HAVE_VSNPRINTF
2409 vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap);
2411 vsprintf(buf + strlen(buf), fmt, ap);
2415 strcat(buf, "\r\n");
2416 SockWrite(sock, buf, strlen(buf));
2418 if (outlevel >= O_MONITOR)
2422 if (shroud && shroud[0] && (cp = strstr(buf, shroud)))
2426 sp = cp + strlen(shroud);
2432 buf[strlen(buf)-2] = '\0';
2433 report(stdout, "%s> %s\n", protocol->name, buf);
2437 int gen_recv(sock, buf, size)
2438 /* get one line of input from the server */
2439 int sock; /* socket to which server is connected */
2440 char *buf; /* buffer to receive input */
2441 int size; /* length of buffer */
2443 int oldphase = phase; /* we don't have to be re-entrant */
2445 phase = SERVER_WAIT;
2446 set_timeout(mytimeout);
2447 if (SockRead(sock, buf, size) == -1)
2456 if (buf[strlen(buf)-1] == '\n')
2457 buf[strlen(buf)-1] = '\0';
2458 if (buf[strlen(buf)-1] == '\r')
2459 buf[strlen(buf)-1] = '\0';
2460 if (outlevel >= O_MONITOR)
2461 report(stdout, "%s< %s\n", protocol->name, buf);
2467 #if defined(HAVE_STDARG_H)
2468 int gen_transact(int sock, const char *fmt, ... )
2470 int gen_transact(int sock, fmt, va_alist)
2471 int sock; /* socket to which server is connected */
2472 const char *fmt; /* printf-style format */
2475 /* assemble command in printf(3) style, send to server, accept a response */
2478 char buf [MSGBUFSIZE+1];
2480 int oldphase = phase; /* we don't have to be re-entrant */
2482 phase = SERVER_WAIT;
2484 if (protocol->tagged)
2485 (void) sprintf(buf, "%s ", GENSYM);
2489 #if defined(HAVE_STDARG_H)
2494 #ifdef HAVE_VSNPRINTF
2495 vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap);
2497 vsprintf(buf + strlen(buf), fmt, ap);
2501 strcat(buf, "\r\n");
2502 SockWrite(sock, buf, strlen(buf));
2504 if (outlevel >= O_MONITOR)
2508 if (shroud && shroud[0] && (cp = strstr(buf, shroud)))
2512 sp = cp + strlen(shroud);
2518 buf[strlen(buf)-1] = '\0';
2519 report(stdout, "%s> %s\n", protocol->name, buf);
2522 /* we presume this does its own response echoing */
2523 ok = (protocol->parse_response)(sock, buf);
2529 /* driver.c ends here */