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? */
86 static const struct method *protocol;
87 static jmp_buf restart;
91 #define GENSYM (sprintf(tag, "A%04d", ++tagnum % TAGMOD), tag)
93 static char shroud[PASSWORDLEN]; /* string to shroud in debug output */
94 static int mytimeout; /* value of nonreponse timeout */
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)
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);
728 else if (!strncasecmp("Message-Id:", buf, 11))
730 if (ctl->server.uidl)
734 buf[IDLEN+12] = 0; /* prevent stack overflow */
735 sscanf(buf+12, "%s", id);
736 if (!str_find( &ctl->newsaved, num))
738 struct idlist *new = save_str(&ctl->newsaved,id,UID_SEEN);
739 new->val.status.num = num;
744 else if (!MULTIDROP(ctl))
747 else if (!strncasecmp("To:", line, 3)
748 || !strncasecmp("Cc:", line, 3)
749 || !strncasecmp("Bcc:", line, 4)
750 || !strncasecmp("Apparently-To:", line, 14))
752 *to_chainptr = xmalloc(sizeof(struct addrblk));
753 (*to_chainptr)->offset = (line - msgblk.headers);
754 to_chainptr = &(*to_chainptr)->next;
758 else if (!strncasecmp("Resent-To:", line, 10)
759 || !strncasecmp("Resent-Cc:", line, 10)
760 || !strncasecmp("Resent-Bcc:", line, 11))
762 *resent_to_chainptr = xmalloc(sizeof(struct addrblk));
763 (*resent_to_chainptr)->offset = (line - msgblk.headers);
764 resent_to_chainptr = &(*resent_to_chainptr)->next;
765 *resent_to_chainptr = NULL;
768 else if (ctl->server.envelope != STRING_DISABLED)
770 if (ctl->server.envelope
771 && strcasecmp(ctl->server.envelope, "Received"))
773 if (env_offs == -1 && !strncasecmp(ctl->server.envelope,
775 strlen(ctl->server.envelope)))
777 if (skipcount++ != ctl->server.envskip)
779 env_offs = (line - msgblk.headers);
782 else if (!received_for && !strncasecmp("Received:", line, 9))
784 if (skipcount++ != ctl->server.envskip)
786 received_for = parse_received(ctl, line);
793 * We want to detect this early in case there are so few headers that the
794 * dispatch logic barfs.
798 if (outlevel > O_SILENT)
800 _("message delimiter found while scanning headers\n"));
804 * Hack time. If the first line of the message was blank, with no headers
805 * (this happens occasionally due to bad gatewaying software) cons up
806 * a set of fake headers.
808 * If you modify the fake header template below, be sure you don't
809 * make either From or To address @-less, otherwise the reply_hack
810 * logic will do bad things.
812 if (msgblk.headers == (char *)NULL)
815 snprintf(buf, sizeof(buf),
818 #endif /* HAVE_SNPRINTF */
819 "From: FETCHMAIL-DAEMON\r\nTo: %s@%s\r\nSubject: Headerless mail from %s's mailbox on %s\r\n",
820 user, fetchmailhost, ctl->remotename, ctl->server.truename);
821 msgblk.headers = xstrdup(buf);
825 * We can now process message headers before reading the text.
826 * In fact we have to, as this will tell us where to forward to.
829 /* Check for MIME headers indicating possible 8-bit data */
830 ctl->mimemsg = MimeBodyType(msgblk.headers, ctl->mimedecode);
833 if (ctl->server.sdps && sdps_envfrom)
835 /* We have the real envelope return-path, stored out of band by
836 * SDPS - that's more accurate than any header is going to be.
838 strcpy(msgblk.return_path, sdps_envfrom);
841 #endif /* SDPS_ENABLE */
843 * If there is a Return-Path address on the message, this was
844 * almost certainly the MAIL FROM address given the originating
845 * sendmail. This is the best thing to use for logging the
846 * message origin (it sets up the right behavior for bounces and
847 * mailing lists). Otherwise, fall down to the next available
848 * envelope address (which is the most probable real sender).
849 * *** The order is important! ***
850 * This is especially useful when receiving mailing list
851 * messages in multidrop mode. if a local address doesn't
852 * exist, the bounce message won't be returned blindly to the
853 * author or to the list itself but rather to the list manager
854 * (ex: specified by "Sender:") which is much less annoying. This
855 * is true for most mailing list packages.
857 if( !msgblk.return_path[0] ){
859 if (resent_sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_sender_offs)));
860 else if (sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + sender_offs)));
861 else if (resent_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_from_offs)));
862 else if (from_offs >= 0 && (ap = nxtaddr(msgblk.headers + from_offs)));
863 else if (reply_to_offs >= 0 && (ap = nxtaddr(msgblk.headers + reply_to_offs)));
864 else if (app_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + app_from_offs)));
865 if (ap) strcpy( msgblk.return_path, ap );
868 /* cons up a list of local recipients */
869 msgblk.recipients = (struct idlist *)NULL;
870 accept_count = reject_count = 0;
871 /* is this a multidrop box? */
875 if (ctl->server.sdps && sdps_envto)
877 /* We have the real envelope recipient, stored out of band by
878 * SDPS - that's more accurate than any header is going to be.
880 find_server_names(sdps_envto, ctl, &msgblk.recipients);
883 #endif /* SDPS_ENABLE */
884 if (env_offs > -1) /* We have the actual envelope addressee */
885 find_server_names(msgblk.headers + env_offs, ctl, &msgblk.recipients);
886 else if (received_for)
888 * We have the Received for addressee.
889 * It has to be a mailserver address, or we
890 * wouldn't have got here.
891 * We use find_server_names() to let local
892 * hostnames go through.
894 find_server_names(received_for, ctl, &msgblk.recipients);
898 * We haven't extracted the envelope address.
899 * So check all the "Resent-To" header addresses if
900 * they exist. If and only if they don't, consider
901 * the "To" addresses.
903 register struct addrblk *nextptr;
904 if (resent_to_addrchain) {
905 /* delete the "To" chain and substitute it
906 * with the "Resent-To" list
908 while (to_addrchain) {
909 nextptr = to_addrchain->next;
911 to_addrchain = nextptr;
913 to_addrchain = resent_to_addrchain;
914 resent_to_addrchain = NULL;
916 /* now look for remaining adresses */
917 while (to_addrchain) {
918 find_server_names(msgblk.headers+to_addrchain->offset, ctl, &msgblk.recipients);
919 nextptr = to_addrchain->next;
921 to_addrchain = nextptr;
926 no_local_matches = TRUE;
927 save_str(&msgblk.recipients, run.postmaster, XMIT_ACCEPT);
928 if (outlevel >= O_DEBUG)
930 _("no local matches, forwarding to %s\n"),
934 else /* it's a single-drop box, use first localname */
935 save_str(&msgblk.recipients, ctl->localnames->id, XMIT_ACCEPT);
939 * Time to either address the message or decide we can't deliver it yet.
941 if (ctl->errcount > olderrs) /* there were DNS errors above */
943 if (outlevel >= O_DEBUG)
945 _("forwarding and deletion suppressed due to DNS errors\n"));
946 free(msgblk.headers);
947 free_str_list(&msgblk.recipients);
948 return(PS_TRANSIENT);
952 /* set up stuffline() so we can deliver the message body through it */
953 if ((n = open_sink(ctl, &msgblk,
954 &good_addresses, &bad_addresses)) != PS_SUCCESS)
956 free(msgblk.headers);
957 free_str_list(&msgblk.recipients);
964 * Some server/sendmail combinations cause problems when our
965 * synthetic Received line is before the From header. Cope
968 if ((rcv = strstr(msgblk.headers, "Received:")) == (char *)NULL)
969 rcv = msgblk.headers;
970 /* handle ">Received:" lines too */
971 while (rcv > msgblk.headers && rcv[-1] != '\n')
973 if (rcv > msgblk.headers)
978 n = stuffline(ctl, msgblk.headers);
981 if (!run.invisible && n != -1)
983 /* utter any per-message Received information we need here */
984 sprintf(buf, "Received: from %s\r\n", ctl->server.truename);
985 n = stuffline(ctl, buf);
989 * This header is technically invalid under RFC822.
990 * POP3, IMAP, etc. are not legal mail-parameter values.
992 * We used to include ctl->remotename in this log line,
993 * but this can be secure information that would be bad
996 sprintf(buf, "\tby %s with %s (fetchmail-%s)\r\n",
1000 n = stuffline(ctl, buf);
1004 if (good_addresses == 0)
1007 "for %s@%s (by default); ",
1008 user, ctl->destaddr);
1010 else if (good_addresses == 1)
1012 for (idp = msgblk.recipients; idp; idp = idp->next)
1013 if (idp->val.status.mark == XMIT_ACCEPT)
1014 break; /* only report first address */
1015 if (strchr(idp->id, '@'))
1016 sprintf(buf+1, "for %s", idp->id);
1019 * This could be a bit misleading, as destaddr is
1020 * the forwarding host rather than the actual
1021 * destination. Most of the time they coincide.
1023 sprintf(buf+1, "for %s@%s", idp->id, ctl->destaddr);
1024 sprintf(buf+strlen(buf), " (%s); ",
1025 MULTIDROP(ctl) ? "multi-drop" : "single-drop");
1030 strcat(buf, rfc822timestamp());
1031 strcat(buf, "\r\n");
1032 n = stuffline(ctl, buf);
1038 n = stuffline(ctl, rcv); /* ship out rest of msgblk.headers */
1042 report(stdout, _("writing RFC822 msgblk.headers\n"));
1044 free(msgblk.headers);
1045 free_str_list(&msgblk.recipients);
1048 else if (!run.use_syslog && outlevel >= O_VERBOSE)
1051 /* write error notifications */
1052 if (no_local_matches || has_nuls || bad_addresses)
1055 char errhd[USERNAMELEN + POPBUFSIZE], *errmsg;
1058 (void) strcpy(errhd, "X-Fetchmail-Warning: ");
1059 if (no_local_matches)
1061 if (reject_count != 1)
1062 strcat(errhd, _("no recipient addresses matched declared local names"));
1065 for (idp = msgblk.recipients; idp; idp = idp->next)
1066 if (idp->val.status.mark == XMIT_REJECT)
1068 sprintf(errhd+strlen(errhd), _("recipient address %s didn't match any local name"), idp->id);
1074 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1075 strcat(errhd, "; ");
1076 strcat(errhd, _("message has embedded NULs"));
1081 if (errhd[sizeof("X-Fetchmail-Warning: ")])
1082 strcat(errhd, "; ");
1083 strcat(errhd, _("SMTP listener rejected local recipient addresses: "));
1084 errlen = strlen(errhd);
1085 for (idp = msgblk.recipients; idp; idp = idp->next)
1086 if (idp->val.status.mark == XMIT_RCPTBAD)
1087 errlen += strlen(idp->id) + 2;
1089 xalloca(errmsg, char *, errlen+3);
1090 (void) strcpy(errmsg, errhd);
1091 for (idp = msgblk.recipients; idp; idp = idp->next)
1092 if (idp->val.status.mark == XMIT_RCPTBAD)
1094 strcat(errmsg, idp->id);
1096 strcat(errmsg, ", ");
1101 strcat(errmsg, "\r\n");
1103 /* ship out the error line */
1104 stuffline(ctl, errmsg);
1107 /* issue the delimiter line */
1112 stuffline(ctl, buf);
1114 free(msgblk.headers);
1115 free_str_list(&msgblk.recipients);
1116 return(headers_ok ? PS_SUCCESS : PS_TRUNCATED);
1119 static int readbody(int sock, struct query *ctl, flag forward, int len)
1120 /* read and dispose of a message body presented on sock */
1121 /* ctl: query control record */
1122 /* sock: to which the server is connected */
1123 /* len: length of message */
1124 /* forward: TRUE to forward */
1127 unsigned char buf[MSGBUFSIZE+4];
1128 unsigned char *inbufp = buf;
1129 flag issoftline = FALSE;
1132 * Pass through the text lines in the body.
1134 * Yes, this wants to be ||, not &&. The problem is that in the most
1135 * important delimited protocol, POP3, the length is not reliable.
1136 * As usual, the problem is Microsoft brain damage; see FAQ item S2.
1137 * So, for delimited protocols we need to ignore the length here and
1138 * instead drop out of the loop with a break statement when we see
1139 * the message delimiter.
1141 while (protocol->delimited || len > 0)
1143 set_timeout(mytimeout);
1144 if ((linelen = SockRead(sock, inbufp, sizeof(buf)-4-(inbufp-buf)))==-1)
1152 /* write the message size dots */
1155 sizeticker += linelen;
1156 while (sizeticker >= SIZETICKER)
1158 if (!run.use_syslog && outlevel > O_SILENT)
1163 sizeticker -= SIZETICKER;
1168 /* check for end of message */
1169 if (protocol->delimited && *inbufp == '.')
1171 if (inbufp[1] == '\r' && inbufp[2] == '\n' && inbufp[3] == '\0')
1173 else if (inbufp[1] == '\n' && inbufp[2] == '\0')
1176 msglen--; /* subtract the size of the dot escape */
1181 if (ctl->mimedecode && (ctl->mimemsg & MSG_NEEDS_DECODE)) {
1182 issoftline = UnMimeBodyline(&inbufp, protocol->delimited, issoftline);
1183 if (issoftline && (sizeof(buf)-1-(inbufp-buf) < 200))
1186 * Soft linebreak, but less than 200 bytes left in
1187 * input buffer. Rather than doing a buffer overrun,
1188 * ignore the soft linebreak, NL-terminate data and
1189 * deliver what we have now.
1190 * (Who writes lines longer than 2K anyway?)
1192 *inbufp = '\n'; *(inbufp+1) = '\0';
1197 /* ship out the text line */
1198 if (forward && (!issoftline))
1203 /* guard against very long lines */
1204 buf[MSGBUFSIZE+1] = '\r';
1205 buf[MSGBUFSIZE+2] = '\n';
1206 buf[MSGBUFSIZE+3] = '\0';
1208 n = stuffline(ctl, buf);
1212 report(stdout, _("writing message text\n"));
1216 else if (outlevel >= O_VERBOSE)
1226 kerberos_auth (socket, canonical)
1227 /* authenticate to the server host using Kerberos V4 */
1228 int socket; /* socket to server host */
1229 #if defined(__FreeBSD__) || defined(__OpenBSD__)
1230 char *canonical; /* server name */
1232 const char *canonical; /* server name */
1235 char * host_primary;
1239 Key_schedule schedule;
1242 xalloca(ticket, KTEXT, sizeof (KTEXT_ST));
1243 rem = (krb_sendauth (0L, socket, ticket, "pop",
1245 ((char *) (krb_realmofhost (canonical))),
1246 ((unsigned long) 0),
1250 ((struct sockaddr_in *) 0),
1251 ((struct sockaddr_in *) 0),
1253 if (rem != KSUCCESS)
1255 report(stderr, _("kerberos error %s\n"), (krb_get_err_text (rem)));
1256 return (PS_AUTHFAIL);
1260 #endif /* KERBEROS_V4 */
1263 static int kerberos5_auth(socket, canonical)
1264 /* authenticate to the server host using Kerberos V5 */
1265 int socket; /* socket to server host */
1266 const char *canonical; /* server name */
1268 krb5_error_code retval;
1269 krb5_context context;
1271 krb5_principal client = NULL, server = NULL;
1272 krb5_error *err_ret = NULL;
1274 krb5_auth_context auth_context = NULL;
1276 krb5_init_context(&context);
1277 krb5_init_ets(context);
1278 krb5_auth_con_init(context, &auth_context);
1280 if (retval = krb5_cc_default(context, &ccdef)) {
1281 report(stderr, "krb5_cc_default: %s\n", error_message(retval));
1285 if (retval = krb5_cc_get_principal(context, ccdef, &client)) {
1286 report(stderr, "krb5_cc_get_principal: %s\n", error_message(retval));
1290 if (retval = krb5_sname_to_principal(context, canonical, "pop",
1293 report(stderr, "krb5_sname_to_principal: %s\n", error_message(retval));
1297 retval = krb5_sendauth(context, &auth_context, (krb5_pointer) &socket,
1298 "KPOPV1.0", client, server,
1299 AP_OPTS_MUTUAL_REQUIRED,
1300 NULL, /* no data to checksum */
1301 0, /* no creds, use ccache instead */
1305 NULL); /* don't need reply */
1307 krb5_free_principal(context, server);
1308 krb5_free_principal(context, client);
1309 krb5_auth_con_free(context, auth_context);
1313 if (err_ret && err_ret->e_text) {
1314 report(stderr, _("krb5_sendauth: %s [server says '%*s'] \n"),
1315 error_message(retval),
1318 if (err_ret && err_ret->text.length) {
1319 report(stderr, _("krb5_sendauth: %s [server says '%*s'] \n"),
1320 error_message(retval),
1321 err_ret->text.length,
1322 err_ret->text.data);
1324 krb5_free_error(context, err_ret);
1326 report(stderr, "krb5_sendauth: %s\n", error_message(retval));
1332 #endif /* KERBEROS_V5 */
1334 static void clean_skipped_list(struct idlist **skipped_list)
1335 /* struct "idlist" contains no "prev" ptr; we must remove unused items first */
1337 struct idlist *current=NULL, *prev=NULL, *tmp=NULL, *head=NULL;
1338 prev = current = head = *skipped_list;
1344 /* if item has no reference, remove it */
1345 if (current && current->val.status.mark == 0)
1347 if (current == head) /* remove first item (head) */
1349 head = current->next;
1350 if (current->id) free(current->id);
1352 prev = current = head;
1354 else /* remove middle/last item */
1356 tmp = current->next;
1358 if (current->id) free(current->id);
1363 else /* skip this item */
1366 current = current->next;
1370 *skipped_list = head;
1373 static void send_size_warnings(struct query *ctl)
1374 /* send warning mail with skipped msg; reset msg count when user notified */
1377 int msg_to_send = FALSE;
1378 struct idlist *head=NULL, *current=NULL;
1379 int max_warning_poll_count;
1380 #define OVERHD "Subject: Fetchmail oversized-messages warning.\r\n\r\nThe following oversized messages remain on the mail server %s:"
1382 head = ctl->skipped;
1386 /* don't start a notification message unless we need to */
1387 for (current = head; current; current = current->next)
1388 if (current->val.status.num == 0 && current->val.status.mark)
1394 * There's no good way to recover if we can't send notification mail,
1395 * but it's not a disaster, either, since the skipped mail will not
1398 if (open_warning_by_mail(ctl, (struct msgblk *)NULL))
1400 stuff_warning(ctl, OVERHD, ctl->server.pollname);
1402 if (run.poll_interval == 0)
1403 max_warning_poll_count = 0;
1405 max_warning_poll_count = ctl->warnings/run.poll_interval;
1407 /* parse list of skipped msg, adding items to the mail */
1408 for (current = head; current; current = current->next)
1410 if (current->val.status.num == 0 && current->val.status.mark)
1412 nbr = current->val.status.mark;
1413 size = atoi(current->id);
1415 _("\t%d msg %d octets long skipped by fetchmail.\n"),
1418 current->val.status.num++;
1419 current->val.status.mark = 0;
1421 if (current->val.status.num >= max_warning_poll_count)
1422 current->val.status.num = 0;
1425 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1429 static int do_session(ctl, proto, maxfetch)
1430 /* retrieve messages from server using given protocol method table */
1431 struct query *ctl; /* parsed options with merged-in defaults */
1432 const struct method *proto; /* protocol method table */
1433 const int maxfetch; /* maximum number of messages to fetch */
1436 #ifdef HAVE_VOLATILE
1437 volatile int ok, mailserver_socket = -1; /* pacifies -Wall */
1439 int ok, mailserver_socket = -1;
1440 #endif /* HAVE_VOLATILE */
1442 void (*pipesave)(int);
1443 void (*alrmsave)(int);
1444 struct idlist *current=NULL, *tmp=NULL;
1447 ctl->server.base_protocol = protocol;
1451 tag[0] = '\0'; /* nuke any tag hanging out from previous query */
1454 /* set up the server-nonresponse timeout */
1455 alrmsave = signal(SIGALRM, timeout_handler);
1456 mytimeout = ctl->server.timeout;
1458 /* set up the broken-pipe timeout */
1459 pipesave = signal(SIGPIPE, sigpipe_handler);
1461 if ((js = setjmp(restart)))
1463 #ifdef HAVE_SIGPROCMASK
1465 * Don't rely on setjmp() to restore the blocked-signal mask.
1466 * It does this under BSD but is required not to under POSIX.
1468 * If your Unix doesn't have sigprocmask, better hope it has
1469 * BSD-like behavior. Otherwise you may see fetchmail get
1470 * permanently wedged after a second timeout on a bad read,
1471 * because alarm signals were blocked after the first.
1475 sigfillset(&allsigs);
1476 sigprocmask(SIG_UNBLOCK, &allsigs, NULL);
1477 #endif /* HAVE_SIGPROCMASK */
1479 if (js == THROW_SIGPIPE)
1482 _("SIGPIPE thrown from an MDA or a stream socket error"));
1485 else if (js == THROW_TIMEOUT)
1487 if (phase == OPEN_WAIT)
1489 _("timeout after %d seconds waiting to connect to server %s.\n"),
1490 ctl->server.timeout, ctl->server.pollname);
1491 else if (phase == SERVER_WAIT)
1493 _("timeout after %d seconds waiting for server %s.\n"),
1494 ctl->server.timeout, ctl->server.pollname);
1495 else if (phase == FORWARDING_WAIT)
1497 _("timeout after %d seconds waiting for %s.\n"),
1498 ctl->server.timeout,
1499 ctl->mda ? "MDA" : "SMTP");
1500 else if (phase == LISTENER_WAIT)
1502 _("timeout after %d seconds waiting for listener to respond.\n"));
1505 _("timeout after %d seconds.\n"), ctl->server.timeout);
1508 * If we've exceeded our threshold for consecutive timeouts,
1509 * try to notify the user, then mark the connection wedged.
1511 if (timeoutcount > MAX_TIMEOUTS
1512 && !open_warning_by_mail(ctl, (struct msgblk *)NULL))
1515 _("Subject: fetchmail sees repeated timeouts\r\n"));
1517 _("Fetchmail saw more than %d timeouts while attempting to get mail from %s@%s.\r\n"),
1520 ctl->server.truename);
1522 _("This could mean that your mailserver is stuck, or that your SMTP\r\n" \
1523 "server is wedged, or that your mailbox file on the server has been\r\n" \
1524 "corrupted by a server error. You can run `fetchmail -v -v' to\r\n" \
1525 "diagnose the problem.\r\n\r\n" \
1526 "Fetchmail won't poll this mailbox again until you restart it.\r\n"));
1527 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1534 /* try to clean up all streams */
1536 if (ctl->smtp_socket != -1)
1537 close(ctl->smtp_socket);
1538 if (mailserver_socket != -1)
1539 SockClose(mailserver_socket);
1543 char buf[POPBUFSIZE+1], *realhost;
1544 int len, num, count, new, bytes, deletions = 0, *msgsizes = NULL;
1546 int fetches, dispatches, oldphase;
1547 #else /* INET6_ENABLE */
1548 int port, fetches, dispatches, oldphase;
1549 #endif /* INET6_ENABLE */
1552 /* execute pre-initialization command, if any */
1553 if (ctl->preconnect && (ok = system(ctl->preconnect)))
1556 _("pre-connection command failed with status %d\n"), ok);
1561 /* open a socket to the mail server */
1564 set_timeout(mytimeout);
1567 port = ctl->server.port ? ctl->server.port : ( ctl->use_ssl ? protocol->sslport : protocol->port );
1569 port = ctl->server.port ? ctl->server.port : protocol->port;
1571 #endif /* !INET6_ENABLE */
1572 realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname;
1574 /* allow time for the port to be set up if we have a plugin */
1575 if (ctl->server.plugin)
1578 if ((mailserver_socket = SockOpen(realhost,
1579 ctl->server.service ? ctl->server.service : protocol->service,
1580 ctl->server.netsec, ctl->server.plugin)) == -1)
1581 #else /* INET6_ENABLE */
1582 if ((mailserver_socket = SockOpen(realhost, port, NULL, ctl->server.plugin)) == -1)
1583 #endif /* INET6_ENABLE */
1587 #ifdef HAVE_RES_SEARCH
1588 if (err_no != 0 && h_errno != 0)
1589 report(stderr, _("fetchmail: internal inconsistency\n"));
1592 * Avoid generating a bogus error every poll cycle when we're
1593 * in daemon mode but the connection to the outside world
1596 if (err_no == EHOSTUNREACH && run.poll_interval)
1599 report_build(stderr, _("fetchmail: %s connection to %s failed"),
1600 protocol->name, ctl->server.pollname);
1601 #ifdef HAVE_RES_SEARCH
1604 if (h_errno == HOST_NOT_FOUND)
1605 report_complete(stderr, _(": host is unknown\n"));
1606 else if (h_errno == NO_ADDRESS)
1607 report_complete(stderr, _(": name is valid but has no IP address\n"));
1608 else if (h_errno == NO_RECOVERY)
1609 report_complete(stderr, _(": unrecoverable name server error\n"));
1610 else if (h_errno == TRY_AGAIN)
1611 report_complete(stderr, _(": temporary name server error\n"));
1613 report_complete(stderr, _(": unknown DNS error %d\n"), h_errno);
1616 #endif /* HAVE_RES_SEARCH */
1617 report_complete(stderr, ": %s\n", strerror(err_no));
1620 #endif /* INET6_ENABLE */
1630 /* perform initial SSL handshake on open connection */
1631 /* Note: We pass the realhost name over for certificate
1632 verification. We may want to make this configurable */
1633 if (ctl->use_ssl && SSLOpen(mailserver_socket,ctl->sslkey,ctl->sslcert,realhost) == -1)
1635 report(stderr, "SSL connection failed.");
1641 if (ctl->server.preauthenticate == A_KERBEROS_V4)
1643 set_timeout(mytimeout);
1644 ok = kerberos_auth(mailserver_socket, ctl->server.truename);
1649 #endif /* KERBEROS_V4 */
1652 if (ctl->server.preauthenticate == A_KERBEROS_V5)
1654 set_timeout(mytimeout);
1655 ok = kerberos5_auth(mailserver_socket, ctl->server.truename);
1660 #endif /* KERBEROS_V5 */
1662 /* accept greeting message from mail server */
1663 ok = (protocol->parse_response)(mailserver_socket, buf);
1667 /* try to get authorized to fetch mail */
1668 stage = STAGE_GETAUTH;
1669 if (protocol->getauth)
1671 if (protocol->password_canonify)
1672 (protocol->password_canonify)(shroud, ctl->password, PASSWORDLEN);
1674 strcpy(shroud, ctl->password);
1676 ok = (protocol->getauth)(mailserver_socket, ctl, buf);
1679 if (ok == PS_LOCKBUSY)
1680 report(stderr, _("Lock-busy error on %s@%s\n"),
1682 ctl->server.truename);
1683 else if (ok == PS_AUTHFAIL)
1685 report(stderr, _("Authorization failure on %s@%s\n"),
1687 ctl->server.truename);
1690 * If we're running in background, try to mail the
1691 * calling user a heads-up about the authentication
1692 * failure once it looks like this isn't a fluke
1693 * due to the server being temporarily inaccessible.
1695 if (run.poll_interval
1696 && ctl->authfailcount++ > MAX_AUTHFAILS
1697 && !open_warning_by_mail(ctl, (struct msgblk *)NULL))
1700 _("Subject: fetchmail authentication failed\r\n"));
1702 _("Fetchmail could not get mail from %s@%s.\r\n"),
1704 ctl->server.truename);
1706 _("The attempt to get authorization failed.\r\n" \
1707 "This probably means your password is invalid, but POP3 servers have\r\n" \
1708 "other failure modes that fetchmail cannot distinguish from this\r\n" \
1709 "because they don't send useful error messages on login failure.\r\n"));
1710 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1715 report(stderr, _("Unknown login or authentication error on %s@%s\n"),
1717 ctl->server.truename);
1723 ctl->errcount = fetches = 0;
1725 /* now iterate over each folder selected */
1726 for (idp = ctl->mailboxes; idp; idp = idp->next)
1733 if (outlevel >= O_DEBUG)
1736 report(stdout, _("selecting or re-polling folder %s\n"), idp->id);
1738 report(stdout, _("selecting or re-polling default folder\n"));
1741 /* compute # of messages and number of new messages waiting */
1742 stage = STAGE_GETRANGE;
1743 ok = (protocol->getrange)(mailserver_socket, ctl, idp->id, &count, &new, &bytes);
1747 /* show user how many messages we downloaded */
1749 (void) sprintf(buf, _("%s at %s (folder %s)"),
1750 ctl->remotename, ctl->server.truename, idp->id);
1752 (void) sprintf(buf, _("%s at %s"),
1753 ctl->remotename, ctl->server.truename);
1754 if (outlevel > O_SILENT)
1756 if (count == -1) /* only used for ETRN */
1757 report(stdout, _("Polling %s\n"), ctl->server.truename);
1758 else if (count != 0)
1760 if (new != -1 && (count - new) > 0)
1761 report_build(stdout, _("%d %s (%d seen) for %s"),
1762 count, count > 1 ? _("messages") :
1766 report_build(stdout, _("%d %s for %s"),
1767 count, count > 1 ? _("messages") :
1770 report_complete(stdout, ".\n");
1772 report_complete(stdout, _(" (%d octets).\n"), bytes);
1776 /* these are pointless in normal daemon mode */
1777 if (pass == 1 && (run.poll_interval == 0 || outlevel >= O_VERBOSE))
1778 report(stdout, _("No mail for %s\n"), buf);
1782 /* very important, this is where we leave the do loop */
1788 if (new == -1 || ctl->fetchall)
1790 fetches = new; /* set error status ccorrectly */
1795 flag force_retrieval;
1798 * What forces this code is that in POP2 and
1799 * IMAP2bis you can't fetch a message without
1800 * having it marked `seen'. In POP3 and IMAP4, on the
1801 * other hand, you can (peek_capable is set by
1802 * each driver module to convey this; it's not a
1803 * method constant because of the difference between
1804 * IMAP2bis and IMAP4, and because POP3 doesn't peek
1805 * if fetchall is on).
1807 * The result of being unable to peek is that if there's
1808 * any kind of transient error (DNS lookup failure, or
1809 * sendmail refusing delivery due to process-table limits)
1810 * the message will be marked "seen" on the server without
1811 * having been delivered. This is not a big problem if
1812 * fetchmail is running in foreground, because the user
1813 * will see a "skipped" message when it next runs and get
1816 * But in daemon mode this leads to the message
1817 * being silently ignored forever. This is not
1820 * We compensate for this by checking the error
1821 * count from the previous pass and forcing all
1822 * messages to be considered new if it's nonzero.
1824 force_retrieval = !peek_capable && (ctl->errcount > 0);
1827 * We need the size of each message before it's
1828 * loaded in order to pass it to the ESMTP SIZE
1829 * option. If the protocol has a getsizes method,
1830 * we presume this means it doesn't get reliable
1831 * sizes from message fetch responses.
1833 if (proto->getsizes)
1837 xalloca(msgsizes, int *, sizeof(int) * count);
1838 for (i = 0; i < count; i++)
1841 stage = STAGE_GETSIZES;
1842 ok = (proto->getsizes)(mailserver_socket, count, msgsizes);
1849 for (i = 0; i < count; i++)
1850 bytes += msgsizes[i];
1854 /* read, forward, and delete messages */
1855 stage = STAGE_FETCH;
1856 for (num = 1; num <= count; num++)
1858 flag toolarge = NUM_NONZERO(ctl->limit)
1859 && msgsizes && (msgsizes[num-1] > ctl->limit);
1860 flag oldmsg = (!new) || (protocol->is_old && (protocol->is_old)(mailserver_socket,ctl,num));
1861 flag fetch_it = !toolarge
1862 && (ctl->fetchall || force_retrieval || !oldmsg);
1863 flag suppress_delete = FALSE;
1864 flag suppress_forward = FALSE;
1865 flag suppress_readbody = FALSE;
1866 flag retained = FALSE;
1869 * This check copes with Post Office/NT's
1870 * annoying habit of randomly prepending bogus
1871 * LIST items of length -1. Patrick Audley
1872 * <paudley@pobox.com> tells us: LIST shows a
1873 * size of -1, RETR and TOP return "-ERR
1874 * System error - couldn't open message", and
1875 * DELE succeeds but doesn't actually delete
1878 if (msgsizes && msgsizes[num-1] == -1)
1880 if (outlevel >= O_VERBOSE)
1882 _("Skipping message %d, length -1\n"),
1888 * We may want to reject this message if it's old
1889 * or oversized, and we're not forcing retrieval.
1893 if (outlevel > O_SILENT)
1895 report_build(stdout, _("skipping message %d"), num);
1896 if (toolarge && !check_only)
1901 /* convert sz to string */
1902 sprintf(size, "%d", msgsizes[num-1]);
1904 /* build a list of skipped messages
1905 * val.id = size of msg (string cnvt)
1906 * val.status.num = warning_poll_count
1907 * val.status.mask = nbr of msg this size
1910 current = ctl->skipped;
1912 /* initialise warning_poll_count to the
1913 * current value so that all new msg will
1914 * be included in the next mail
1916 cnt = current? current->val.status.num : 0;
1918 /* if entry exists, increment the count */
1920 str_in_list(¤t, size, FALSE))
1923 current = current->next)
1925 if (strcmp(current->id, size) == 0)
1927 current->val.status.mark++;
1932 /* otherwise, create a new entry */
1933 /* initialise with current poll count */
1936 tmp = save_str(&ctl->skipped, size, 1);
1937 tmp->val.status.num = cnt;
1940 report_build(stdout, _(" (oversized, %d octets)"),
1947 flag wholesize = !protocol->fetch_body;
1949 /* request a message */
1950 ok = (protocol->fetch_headers)(mailserver_socket,ctl,num, &len);
1954 /* -1 means we didn't see a size in the response */
1955 if (len == -1 && msgsizes)
1957 len = msgsizes[num - 1];
1961 if (outlevel > O_SILENT)
1963 report_build(stdout, _("reading message %d of %d"),
1967 report_build(stdout, _(" (%d %soctets)"),
1968 len, wholesize ? "" : _("header "));
1969 if (outlevel >= O_VERBOSE)
1970 report_complete(stdout, "\n");
1972 report_complete(stdout, " ");
1976 * Read the message headers and ship them to the
1979 ok = readheaders(mailserver_socket, len, msgsizes[num-1],
1981 if (ok == PS_RETAINED)
1982 suppress_forward = retained = TRUE;
1983 else if (ok == PS_TRANSIENT)
1984 suppress_delete = suppress_forward = TRUE;
1985 else if (ok == PS_REFUSED)
1986 suppress_forward = TRUE;
1987 else if (ok == PS_TRUNCATED)
1988 suppress_readbody = TRUE;
1993 * If we're using IMAP4 or something else that
1994 * can fetch headers separately from bodies,
1995 * it's time to request the body now. This
1996 * fetch may be skipped if we got an anti-spam
1997 * or other PS_REFUSED error response during
2000 if (protocol->fetch_body && !suppress_readbody)
2002 if (outlevel >= O_VERBOSE)
2004 fputc('\n', stdout);
2008 if ((ok = (protocol->trail)(mailserver_socket, ctl, num)))
2011 if (!suppress_forward)
2013 if ((ok=(protocol->fetch_body)(mailserver_socket,ctl,num,&len)))
2016 * Work around a bug in Novell's
2017 * broken GroupWise IMAP server;
2018 * its body FETCH response is missing
2019 * the required length for the data
2020 * string. This violates RFC2060.
2023 len = msgsizes[num-1] - msglen;
2024 if (outlevel > O_SILENT && !wholesize)
2025 report_complete(stdout,
2026 _(" (%d body octets) "), len);
2030 /* process the body now */
2033 if (suppress_readbody)
2035 /* When readheaders returns PS_TRUNCATED,
2036 the body (which has no content
2037 has already been read by readheaders,
2038 so we say readbody returned PS_SUCCESS */
2043 ok = readbody(mailserver_socket,
2048 if (ok == PS_TRANSIENT)
2049 suppress_delete = suppress_forward = TRUE;
2053 /* tell server we got it OK and resynchronize */
2054 if (protocol->trail)
2056 if (outlevel >= O_VERBOSE)
2058 fputc('\n', stdout);
2062 ok = (protocol->trail)(mailserver_socket, ctl, num);
2068 /* count # messages forwarded on this pass */
2069 if (!suppress_forward)
2073 * Check to see if the numbers matched?
2075 * Yes, some servers foo this up horribly.
2076 * All IMAP servers seem to get it right, and
2077 * so does Eudora QPOP at least in 2.xx
2080 * Microsoft Exchange gets it completely
2081 * wrong, reporting compressed rather than
2082 * actual sizes (so the actual length of
2083 * message is longer than the reported size).
2084 * Another fine example of Microsoft brain death!
2086 * Some older POP servers, like the old UCB
2087 * POP server and the pre-QPOP QUALCOMM
2088 * versions, report a longer size in the LIST
2089 * response than actually gets shipped up.
2090 * It's unclear what is going on here, as the
2091 * QUALCOMM server (at least) seems to be
2092 * reporting the on-disk size correctly.
2094 if (msgsizes && msglen != msgsizes[num-1])
2096 if (outlevel >= O_DEBUG)
2098 _("message %d was not the expected length (%d actual != %d expected)\n"),
2099 num, msglen, msgsizes[num-1]);
2102 /* end-of-message processing starts here */
2103 if (!close_sink(ctl, &msgblk, !suppress_forward))
2106 suppress_delete = TRUE;
2112 * At this point in flow of control, either
2113 * we've bombed on a protocol error or had
2114 * delivery refused by the SMTP server
2115 * (unlikely -- I've never seen it) or we've
2116 * seen `accepted for delivery' and the
2117 * message is shipped. It's safe to mark the
2118 * message seen and delete it on the server
2122 /* tell the UID code we've seen this */
2127 for (sdp = ctl->newsaved; sdp; sdp = sdp->next)
2128 if (sdp->val.status.num == num)
2129 sdp->val.status.mark = UID_SEEN;
2132 /* maybe we delete this message now? */
2135 if (outlevel > O_SILENT)
2136 report(stdout, _(" retained\n"));
2138 else if (protocol->delete
2140 && (fetch_it ? !ctl->keep : ctl->flush))
2143 if (outlevel > O_SILENT)
2144 report_complete(stdout, _(" flushed\n"));
2145 ok = (protocol->delete)(mailserver_socket, ctl, num);
2149 delete_str(&ctl->newsaved, num);
2150 #endif /* POP3_ENABLE */
2152 else if (outlevel > O_SILENT)
2153 report_complete(stdout, _(" not flushed\n"));
2155 /* perhaps this as many as we're ready to handle */
2156 if (maxfetch && maxfetch <= fetches && fetches < count)
2158 report(stdout, _("fetchlimit %d reached; %d messages left on server\n"),
2159 maxfetch, count - fetches);
2165 if (!check_only && ctl->skipped
2166 && run.poll_interval > 0 && !nodetach)
2168 clean_skipped_list(&ctl->skipped);
2169 send_size_warnings(ctl);
2174 * Only re-poll if we had some actual forwards, allowed
2175 * deletions and had no errors.
2176 * Otherwise it is far too easy to get into infinite loops.
2178 (dispatches && protocol->retry && !ctl->keep && !ctl->errcount);
2182 /* ordinary termination with no errors -- officially log out */
2183 ok = (protocol->logout_cmd)(mailserver_socket, ctl);
2185 * Hmmmm...arguably this would be incorrect if we had fetches but
2186 * no dispatches (due to oversized messages, etc.)
2189 ok = (fetches > 0) ? PS_SUCCESS : PS_NOMAIL;
2190 SockClose(mailserver_socket);
2194 /* we only get here on error */
2195 if (ok != 0 && ok != PS_SOCKET)
2197 stage = STAGE_LOGOUT;
2198 (protocol->logout_cmd)(mailserver_socket, ctl);
2200 SockClose(mailserver_socket);
2203 msg = (const char *)NULL; /* sacrifice to -Wall */
2210 msg = _("authorization");
2213 msg = _("missing or bad RFC822 header");
2219 msg = _("client/server synchronization");
2222 msg = _("client/server protocol");
2225 msg = _("lock busy on server");
2228 msg = _("SMTP transaction");
2231 msg = _("DNS lookup");
2234 report(stderr, _("undefined error\n"));
2237 /* no report on PS_MAXFETCH or PS_UNDEFINED */
2238 if (ok==PS_SOCKET || ok==PS_AUTHFAIL || ok==PS_SYNTAX
2239 || ok==PS_IOERR || ok==PS_ERROR || ok==PS_PROTOCOL
2240 || ok==PS_LOCKBUSY || ok==PS_SMTP || ok==PS_DNS)
2241 report(stderr, _("%s error while fetching from %s\n"), msg, ctl->server.pollname);
2244 /* execute post-initialization command, if any */
2245 if (ctl->postconnect && (ok = system(ctl->postconnect)))
2247 report(stderr, _("post-connection command failed with status %d\n"), ok);
2248 if (ok == PS_SUCCESS)
2252 signal(SIGALRM, alrmsave);
2253 signal(SIGPIPE, pipesave);
2257 int do_protocol(ctl, proto)
2258 /* retrieve messages from server using given protocol method table */
2259 struct query *ctl; /* parsed options with merged-in defaults */
2260 const struct method *proto; /* protocol method table */
2265 if (ctl->server.preauthenticate == A_KERBEROS_V4)
2267 report(stderr, _("Kerberos V4 support not linked.\n"));
2270 #endif /* KERBEROS_V4 */
2273 if (ctl->server.preauthenticate == A_KERBEROS_V5)
2275 report(stderr, _("Kerberos V5 support not linked.\n"));
2278 #endif /* KERBEROS_V5 */
2280 /* lacking methods, there are some options that may fail */
2283 /* check for unsupported options */
2286 _("Option --flush is not supported with %s\n"),
2290 else if (ctl->fetchall) {
2292 _("Option --all is not supported with %s\n"),
2297 if (!proto->getsizes && NUM_SPECIFIED(ctl->limit))
2300 _("Option --limit is not supported with %s\n"),
2306 * If no expunge limit or we do expunges within the driver,
2307 * then just do one session, passing in any fetchlimit.
2309 if (proto->retry || !NUM_SPECIFIED(ctl->expunge))
2310 return(do_session(ctl, proto, NUM_VALUE_OUT(ctl->fetchlimit)));
2312 * There's an expunge limit, and it isn't handled in the driver itself.
2313 * OK; do multiple sessions, each fetching a limited # of messages.
2314 * Stop if the total count of retrieved messages exceeds ctl->fetchlimit
2315 * (if it was nonzero).
2321 int expunge = NUM_VALUE_OUT(ctl->expunge);
2322 int fetchlimit = NUM_VALUE_OUT(ctl->fetchlimit);
2325 ok = do_session(ctl, proto, expunge);
2326 totalcount += expunge;
2327 if (NUM_SPECIFIED(ctl->fetchlimit) && totalcount >= fetchlimit)
2329 if (ok != PS_LOCKBUSY)
2331 else if (lockouts >= MAX_LOCKOUTS)
2333 else /* ok == PS_LOCKBUSY */
2336 * Allow time for the server lock to release. if we
2337 * don't do this, we'll often hit a locked-mailbox
2338 * condition and fail.
2344 (ok == PS_MAXFETCH || ok == PS_LOCKBUSY);
2350 #if defined(HAVE_STDARG_H)
2351 void gen_send(int sock, const char *fmt, ... )
2353 void gen_send(sock, fmt, va_alist)
2354 int sock; /* socket to which server is connected */
2355 const char *fmt; /* printf-style format */
2358 /* assemble command in printf(3) style and send to the server */
2360 char buf [MSGBUFSIZE+1];
2363 if (protocol->tagged)
2364 (void) sprintf(buf, "%s ", GENSYM);
2368 #if defined(HAVE_STDARG_H)
2373 #ifdef HAVE_VSNPRINTF
2374 vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap);
2376 vsprintf(buf + strlen(buf), fmt, ap);
2380 strcat(buf, "\r\n");
2381 SockWrite(sock, buf, strlen(buf));
2383 if (outlevel >= O_MONITOR)
2387 if (shroud && shroud[0] && (cp = strstr(buf, shroud)))
2391 sp = cp + strlen(shroud);
2397 buf[strlen(buf)-2] = '\0';
2398 report(stdout, "%s> %s\n", protocol->name, buf);
2402 int gen_recv(sock, buf, size)
2403 /* get one line of input from the server */
2404 int sock; /* socket to which server is connected */
2405 char *buf; /* buffer to receive input */
2406 int size; /* length of buffer */
2408 int oldphase = phase; /* we don't have to be re-entrant */
2410 phase = SERVER_WAIT;
2411 set_timeout(mytimeout);
2412 if (SockRead(sock, buf, size) == -1)
2421 if (buf[strlen(buf)-1] == '\n')
2422 buf[strlen(buf)-1] = '\0';
2423 if (buf[strlen(buf)-1] == '\r')
2424 buf[strlen(buf)-1] = '\0';
2425 if (outlevel >= O_MONITOR)
2426 report(stdout, "%s< %s\n", protocol->name, buf);
2432 #if defined(HAVE_STDARG_H)
2433 int gen_transact(int sock, const char *fmt, ... )
2435 int gen_transact(int sock, fmt, va_alist)
2436 int sock; /* socket to which server is connected */
2437 const char *fmt; /* printf-style format */
2440 /* assemble command in printf(3) style, send to server, accept a response */
2443 char buf [MSGBUFSIZE+1];
2445 int oldphase = phase; /* we don't have to be re-entrant */
2447 phase = SERVER_WAIT;
2449 if (protocol->tagged)
2450 (void) sprintf(buf, "%s ", GENSYM);
2454 #if defined(HAVE_STDARG_H)
2459 #ifdef HAVE_VSNPRINTF
2460 vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap);
2462 vsprintf(buf + strlen(buf), fmt, ap);
2466 strcat(buf, "\r\n");
2467 SockWrite(sock, buf, strlen(buf));
2469 if (outlevel >= O_MONITOR)
2473 if (shroud && shroud[0] && (cp = strstr(buf, shroud)))
2477 sp = cp + strlen(shroud);
2483 buf[strlen(buf)-1] = '\0';
2484 report(stdout, "%s> %s\n", protocol->name, buf);
2487 /* we presume this does its own response echoing */
2488 ok = (protocol->parse_response)(sock, buf);
2494 /* driver.c ends here */