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.
15 #endif /* HAVE_MEMORY_H */
16 #if defined(STDC_HEADERS)
20 #if defined(HAVE_UNISTD_H)
23 #if defined(HAVE_SYS_ITIMER_H)
24 #include <sys/itimer.h>
27 #ifdef HAVE_SYS_WAIT_H
31 #ifdef HAVE_SYS_SOCKET_H
32 #include <sys/socket.h>
34 #ifdef HAVE_NET_SOCKET_H
35 #include <net/socket.h>
38 #ifdef HAVE_PKG_hesiod
46 #include <netinet/in.h>
47 #endif /* KERBEROS_V4 */
52 #include "fetchmail.h"
53 #include "getaddrinfo.h"
56 /* throw types for runtime errors */
57 #define THROW_TIMEOUT 1 /* server timed out */
59 /* magic values for the message length array */
60 #define MSGLEN_UNKNOWN 0 /* length unknown (0 is impossible) */
61 #define MSGLEN_INVALID -1 /* length passed back is invalid */
62 #define MSGLEN_TOOLARGE -2 /* message is too large */
63 #define MSGLEN_OLD -3 /* message is old */
65 int pass; /* how many times have we re-polled? */
66 int stage; /* where are we? */
67 int phase; /* where are we, for error-logging purposes? */
68 int batchcount; /* count of messages sent in current batch */
69 flag peek_capable; /* can we peek for better error recovery? */
70 int mailserver_socket_temp = -1; /* socket to free if connect timeout */
72 struct addrinfo *ai0, *ai1; /* clean these up after signal */
74 static volatile int timeoutcount = 0; /* count consecutive timeouts */
75 static volatile int idletimeout = 0; /* timeout occured in idle stage? */
77 static sigjmp_buf restart;
79 int is_idletimeout(void)
80 /* last timeout occured in idle stage? */
85 void resetidletimeout(void)
90 void set_timeout(int timeleft)
91 /* reset the nonresponse-timeout */
93 #if !defined(__EMX__) && !defined(__BEOS__)
94 struct itimerval ntimeout;
99 ntimeout.it_interval.tv_sec = ntimeout.it_interval.tv_usec = 0;
100 ntimeout.it_value.tv_sec = timeleft;
101 ntimeout.it_value.tv_usec = 0;
102 setitimer(ITIMER_REAL, &ntimeout, (struct itimerval *)NULL);
106 static RETSIGTYPE timeout_handler (int signal)
107 /* handle SIGALRM signal indicating a server timeout */
110 if(stage != STAGE_IDLE) {
112 /* XXX FIXME: this siglongjmp must die - it's not safe to be
113 * called from a function handler and breaks, for instance,
115 siglongjmp(restart, THROW_TIMEOUT);
120 #define CLEANUP_TIMEOUT 60 /* maximum timeout during cleanup */
122 static int cleanupSockClose (int fd)
123 /* close sockets in maximum CLEANUP_TIMEOUT seconds during cleanup */
126 SIGHANDLERTYPE alrmsave;
127 alrmsave = set_signal_handler(SIGALRM, null_signal_handler);
128 set_timeout(CLEANUP_TIMEOUT);
129 scerror = SockClose(fd);
131 set_signal_handler(SIGALRM, alrmsave);
136 static int kerberos_auth(socket, canonical, principal)
137 /* authenticate to the server host using Kerberos V4 */
138 int socket; /* socket to server host */
139 char *canonical; /* server name */
145 Key_schedule schedule;
147 char * prin_copy = (char *) NULL;
148 char * prin = (char *) NULL;
149 char * inst = (char *) NULL;
150 char * realm = (char *) NULL;
152 if (principal != (char *)NULL && *principal)
155 prin = prin_copy = xstrdup(principal);
156 for (cp = prin_copy; *cp && *cp != '.'; ++cp)
162 while (*cp && *cp != '@')
172 ticket = xmalloc(sizeof (KTEXT_ST));
173 rem = (krb_sendauth (0L, socket, ticket,
175 inst ? inst : canonical,
176 realm ? realm : ((char *) (krb_realmofhost (canonical))),
181 ((struct sockaddr_in *) 0),
182 ((struct sockaddr_in *) 0),
191 report(stderr, GT_("kerberos error %s\n"), (krb_get_err_text (rem)));
192 return (PS_AUTHFAIL);
196 #endif /* KERBEROS_V4 */
199 static int kerberos5_auth(socket, canonical)
200 /* authenticate to the server host using Kerberos V5 */
201 int socket; /* socket to server host */
202 const char *canonical; /* server name */
204 krb5_error_code retval;
205 krb5_context context;
207 krb5_principal client = NULL, server = NULL;
208 krb5_error *err_ret = NULL;
210 krb5_auth_context auth_context = NULL;
212 krb5_init_context(&context);
213 krb5_auth_con_init(context, &auth_context);
215 if ((retval = krb5_cc_default(context, &ccdef))) {
216 report(stderr, "krb5_cc_default: %s\n", error_message(retval));
220 if ((retval = krb5_cc_get_principal(context, ccdef, &client))) {
221 report(stderr, "krb5_cc_get_principal: %s\n", error_message(retval));
225 if ((retval = krb5_sname_to_principal(context, canonical, "pop",
228 report(stderr, "krb5_sname_to_principal: %s\n", error_message(retval));
232 retval = krb5_sendauth(context, &auth_context, (krb5_pointer) &socket,
233 "KPOPV1.0", client, server,
234 AP_OPTS_MUTUAL_REQUIRED,
235 NULL, /* no data to checksum */
236 0, /* no creds, use ccache instead */
240 NULL); /* don't need reply */
242 krb5_free_principal(context, server);
243 krb5_free_principal(context, client);
244 krb5_auth_con_free(context, auth_context);
248 if (err_ret && err_ret->e_text) {
249 report(stderr, GT_("krb5_sendauth: %s [server says '%*s'] \n"),
250 error_message(retval),
253 if (err_ret && err_ret->text.length) {
254 report(stderr, GT_("krb5_sendauth: %s [server says '%*s'] \n"),
255 error_message(retval),
256 err_ret->text.length,
259 krb5_free_error(context, err_ret);
261 report(stderr, "krb5_sendauth: %s\n", error_message(retval));
267 #endif /* KERBEROS_V5 */
269 static void clean_skipped_list(struct idlist **skipped_list)
270 /* struct "idlist" contains no "prev" ptr; we must remove unused items first */
272 struct idlist *current=NULL, *prev=NULL, *tmp=NULL, *head=NULL;
273 prev = current = head = *skipped_list;
279 /* if item has no reference, remove it */
280 if (current && current->val.status.mark == 0)
282 if (current == head) /* remove first item (head) */
284 head = current->next;
285 if (current->id) free(current->id);
287 prev = current = head;
289 else /* remove middle/last item */
293 if (current->id) free(current->id);
298 else /* skip this item */
301 current = current->next;
305 *skipped_list = head;
308 static void send_size_warnings(struct query *ctl)
309 /* send warning mail with skipped msg; reset msg count when user notified */
312 int msg_to_send = FALSE;
313 struct idlist *head=NULL, *current=NULL;
314 int max_warning_poll_count;
320 /* don't start a notification message unless we need to */
321 for (current = head; current; current = current->next)
322 if (current->val.status.num == 0 && current->val.status.mark)
328 * There's no good way to recover if we can't send notification mail,
329 * but it's not a disaster, either, since the skipped mail will not
332 if (open_warning_by_mail(ctl))
334 stuff_warning(iana_charset, ctl,
335 GT_("Subject: Fetchmail oversized-messages warning"));
336 stuff_warning(NULL, ctl, "%s", "");
338 stuff_warning(NULL, ctl,
339 GT_("The following oversized messages were deleted on server %s account %s:"),
340 ctl->server.pollname, ctl->remotename);
342 stuff_warning(NULL, ctl,
343 GT_("The following oversized messages remain on server %s account %s:"),
344 ctl->server.pollname, ctl->remotename);
346 stuff_warning(NULL, ctl, "%s", "");
348 if (run.poll_interval == 0)
349 max_warning_poll_count = 0;
351 max_warning_poll_count = ctl->warnings/run.poll_interval;
353 /* parse list of skipped msg, adding items to the mail */
354 for (current = head; current; current = current->next)
356 if (current->val.status.num == 0 && current->val.status.mark)
358 nbr = current->val.status.mark;
359 size = atoi(current->id);
361 stuff_warning(NULL, ctl,
362 ngettext(" %d message %d octets long deleted by fetchmail.",
363 " %d messages %d octets long deleted by fetchmail.", nbr),
366 stuff_warning(NULL, ctl,
367 ngettext(" %d message %d octets long skipped by fetchmail.",
368 " %d messages %d octets long skipped by fetchmail.", nbr),
371 current->val.status.num++;
372 current->val.status.mark = 0;
374 if (current->val.status.num >= max_warning_poll_count)
375 current->val.status.num = 0;
378 stuff_warning(NULL, ctl, "%s", "");
380 close_warning_by_mail(ctl, (struct msgblk *)NULL);
383 static void mark_oversized(struct query *ctl, int size)
384 /* mark a message oversized */
386 struct idlist *current=NULL, *tmp=NULL;
390 /* convert size to string */
391 snprintf(sizestr, sizeof(sizestr), "%d", size);
393 /* build a list of skipped messages
394 * val.id = size of msg (string cnvt)
395 * val.status.num = warning_poll_count
396 * val.status.mask = nbr of msg this size
399 current = ctl->skipped;
401 /* initialise warning_poll_count to the
402 * current value so that all new msg will
403 * be included in the next mail
405 cnt = current ? current->val.status.num : 0;
407 /* if entry exists, increment the count */
408 if (current && (tmp = str_in_list(¤t, sizestr, FALSE)))
410 tmp->val.status.mark++;
412 /* otherwise, create a new entry */
413 /* initialise with current poll count */
416 tmp = save_str(&ctl->skipped, sizestr, 1);
417 tmp->val.status.num = cnt;
421 static int fetch_messages(int mailserver_socket, struct query *ctl,
422 int count, int **msgsizes, int maxfetch,
423 int *fetches, int *dispatches, int *deletions)
424 /* fetch messages in lockstep mode */
426 flag force_retrieval;
427 int num, firstnum = 1, lastnum = 0, err, len;
428 int fetchsizelimit = ctl->fetchsizelimit;
430 int initialfetches = *fetches;
432 if (ctl->server.base_protocol->getpartialsizes && NUM_NONZERO(fetchsizelimit))
434 /* for POP3, we can get the size of one mail only! Unfortunately, this
435 * protocol specific test cannot be done elsewhere as the protocol
436 * could be "auto". */
437 switch (ctl->server.protocol)
439 case P_POP3: case P_APOP: case P_RPOP:
443 /* Time to allocate memory to store the sizes */
445 *msgsizes = (int *)xmalloc(sizeof(int) * fetchsizelimit);
449 * What forces this code is that in POP2 and
450 * IMAP2bis you can't fetch a message without
451 * having it marked `seen'. In POP3 and IMAP4, on the
452 * other hand, you can (peek_capable is set by
453 * each driver module to convey this; it's not a
454 * method constant because of the difference between
455 * IMAP2bis and IMAP4, and because POP3 doesn't peek
456 * if fetchall is on).
458 * The result of being unable to peek is that if there's
459 * any kind of transient error (DNS lookup failure, or
460 * sendmail refusing delivery due to process-table limits)
461 * the message will be marked "seen" on the server without
462 * having been delivered. This is not a big problem if
463 * fetchmail is running in foreground, because the user
464 * will see a "skipped" message when it next runs and get
467 * But in daemon mode this leads to the message
468 * being silently ignored forever. This is not
471 * We compensate for this by checking the error
472 * count from the previous pass and forcing all
473 * messages to be considered new if it's nonzero.
475 force_retrieval = !peek_capable && (ctl->errcount > 0);
477 for (num = 1; num <= count; num++)
479 flag suppress_delete = FALSE;
480 flag suppress_forward = FALSE;
481 flag suppress_readbody = FALSE;
482 flag retained = FALSE;
483 int msgcode = MSGLEN_UNKNOWN;
485 /* check if the message is old
486 * Note: the size of the message may not be known here */
487 if (ctl->fetchall || force_retrieval)
489 else if (ctl->server.base_protocol->is_old && (ctl->server.base_protocol->is_old)(mailserver_socket,ctl,num))
490 msgcode = MSGLEN_OLD;
491 if (msgcode == MSGLEN_OLD)
493 /* To avoid flooding the syslog when using --keep,
494 * report "Skipped message" only when:
495 * 1) --verbose is on, or
496 * 2) fetchmail does not use syslog
498 if ( (outlevel >= O_VERBOSE) ||
499 (outlevel > O_SILENT && !run.use_syslog)
503 GT_("skipping message %s@%s:%d"),
504 ctl->remotename, ctl->server.truename, num);
510 if (ctl->server.base_protocol->getpartialsizes && NUM_NONZERO(fetchsizelimit) &&
513 /* Instead of getting the sizes of all mails at the start, we get
514 * the sizes in blocks of fetchsizelimit. This leads to better
515 * performance when there are too many mails (say, 10000) in
516 * the mailbox and either we are not getting all the mails at
517 * one go (--fetchlimit 100) or there is a frequent socket
518 * error while just getting the sizes of all mails! */
521 int oldstage = stage;
523 lastnum = num + fetchsizelimit - 1;
526 for (i = 0; i < fetchsizelimit; i++)
529 stage = STAGE_GETSIZES;
530 err = (ctl->server.base_protocol->getpartialsizes)(mailserver_socket, num, lastnum, *msgsizes);
537 msgsize = *msgsizes ? (*msgsizes)[num-firstnum] : 0;
539 /* check if the message is oversized */
540 if (NUM_NONZERO(ctl->limit) && (msgsize > ctl->limit))
541 msgcode = MSGLEN_TOOLARGE;
542 /* else if (msgsize == 512)
543 msgcode = MSGLEN_OLD; (hmh) sample code to skip message */
547 if (msgcode == MSGLEN_TOOLARGE)
549 mark_oversized(ctl, msgsize);
550 if (!ctl->limitflush)
551 suppress_delete = TRUE;
553 if (outlevel > O_SILENT)
555 /* old messages are already handled above */
557 GT_("skipping message %s@%s:%d (%d octets)"),
558 ctl->remotename, ctl->server.truename, num,
564 * Invalid lengths are produced by Post Office/NT's
565 * annoying habit of randomly prepending bogus
566 * LIST items of length -1. Patrick Audley
567 * <paudley@pobox.com> tells us: LIST shows a
568 * size of -1, RETR and TOP return "-ERR
569 * System error - couldn't open message", and
570 * DELE succeeds but doesn't actually delete
573 report_build(stdout, GT_(" (length -1)"));
575 case MSGLEN_TOOLARGE:
576 report_build(stdout, GT_(" (oversized)"));
583 flag wholesize = !ctl->server.base_protocol->fetch_body;
584 flag separatefetchbody = (ctl->server.base_protocol->fetch_body) ? TRUE : FALSE;
586 /* request a message */
587 err = (ctl->server.base_protocol->fetch_headers)(mailserver_socket,ctl,num, &len);
588 if (err == PS_TRANSIENT) /* server is probably Exchange */
591 GT_("couldn't fetch headers, message %s@%s:%d (%d octets)\n"),
592 ctl->remotename, ctl->server.truename, num,
599 /* -1 means we didn't see a size in the response */
606 if (outlevel > O_SILENT)
608 report_build(stdout, GT_("reading message %s@%s:%d of %d"),
609 ctl->remotename, ctl->server.truename,
613 report_build(stdout, wholesize ? GT_(" (%d octets)")
614 : GT_(" (%d header octets)"), len);
615 if (outlevel >= O_VERBOSE)
616 report_complete(stdout, "\n");
620 * Read the message headers and ship them to the
623 err = readheaders(mailserver_socket, len, msgsize,
625 /* pass the suppress_readbody flag only if the underlying
626 * protocol does not fetch the body separately */
627 separatefetchbody ? 0 : &suppress_readbody);
628 if (err == PS_RETAINED)
629 suppress_forward = suppress_delete = retained = TRUE;
630 else if (err == PS_TRANSIENT)
631 suppress_delete = suppress_forward = TRUE;
632 else if (err == PS_REFUSED)
633 suppress_forward = TRUE;
637 /* tell server we got it OK and resynchronize */
638 if (separatefetchbody && ctl->server.base_protocol->trail)
640 if (outlevel >= O_VERBOSE && !is_a_file(1) && !run.use_syslog)
646 if ((err = (ctl->server.base_protocol->trail)(mailserver_socket, ctl, tag)))
650 /* do not read the body which is not being forwarded only if
651 * the underlying protocol allows the body to be fetched
653 if (separatefetchbody && suppress_forward)
654 suppress_readbody = TRUE;
657 * If we're using IMAP4 or something else that
658 * can fetch headers separately from bodies,
659 * it's time to request the body now. This
660 * fetch may be skipped if we got an anti-spam
661 * or other PS_REFUSED error response during
664 if (!suppress_readbody)
666 if (separatefetchbody)
669 if ((err=(ctl->server.base_protocol->fetch_body)(mailserver_socket,ctl,num,&len)))
672 * Work around a bug in Novell's
673 * broken GroupWise IMAP server;
674 * its body FETCH response is missing
675 * the required length for the data
676 * string. This violates RFC2060.
679 len = msgsize - msgblk.msglen;
680 if (outlevel > O_SILENT && !wholesize)
682 GT_(" (%d body octets)"), len);
685 /* process the body now */
686 err = readbody(mailserver_socket,
690 if (err == PS_TRANSIENT)
691 suppress_delete = suppress_forward = TRUE;
695 /* tell server we got it OK and resynchronize */
696 if (ctl->server.base_protocol->trail)
698 if (outlevel >= O_VERBOSE && !is_a_file(1) && !run.use_syslog)
704 err = (ctl->server.base_protocol->trail)(mailserver_socket, ctl, tag);
710 /* count # messages forwarded on this pass */
711 if (!suppress_forward)
715 * Check to see if the numbers matched?
717 * Yes, some servers foo this up horribly.
718 * All IMAP servers seem to get it right, and
719 * so does Eudora QPOP at least in 2.xx
722 * Microsoft Exchange gets it completely
723 * wrong, reporting compressed rather than
724 * actual sizes (so the actual length of
725 * message is longer than the reported size).
726 * Another fine example of Microsoft brain death!
728 * Some older POP servers, like the old UCB
729 * POP server and the pre-QPOP QUALCOMM
730 * versions, report a longer size in the LIST
731 * response than actually gets shipped up.
732 * It's unclear what is going on here, as the
733 * QUALCOMM server (at least) seems to be
734 * reporting the on-disk size correctly.
736 * qmail-pop3d also goofs up message sizes and does not
737 * count the line end characters properly.
739 if (msgblk.msglen != msgsize)
741 if (outlevel >= O_DEBUG)
743 GT_("message %s@%s:%d was not the expected length (%d actual != %d expected)\n"),
744 ctl->remotename, ctl->server.truename, num,
745 msgblk.msglen, msgsize);
748 /* end-of-message processing starts here */
749 if (!close_sink(ctl, &msgblk, !suppress_forward))
752 suppress_delete = TRUE;
760 * At this point in flow of control, either
761 * we've bombed on a protocol error or had
762 * delivery refused by the SMTP server
763 * (unlikely -- I've never seen it) or we've
764 * seen `accepted for delivery' and the
765 * message is shipped. It's safe to mark the
766 * message seen and delete it on the server
770 /* maybe we delete this message now? */
773 if (outlevel > O_SILENT)
774 report_complete(stdout, GT_(" retained\n"));
776 else if (ctl->server.base_protocol->delete_msg
778 && ((msgcode >= 0 && !ctl->keep)
779 || (msgcode == MSGLEN_OLD && ctl->flush)
780 || (msgcode == MSGLEN_TOOLARGE && ctl->limitflush)))
783 if (outlevel > O_SILENT)
784 report_complete(stdout, GT_(" flushed\n"));
785 err = (ctl->server.base_protocol->delete_msg)(mailserver_socket, ctl, num);
791 if ( (outlevel >= O_VERBOSE) ||
792 /* To avoid flooding the syslog when using --keep,
793 * report "Skipped message" only when:
794 * 1) --verbose is on, or
795 * 2) fetchmail does not use syslog, or
796 * 3) the message was skipped for some other
797 * reason than just being old.
799 (outlevel > O_SILENT && (!run.use_syslog || msgcode != MSGLEN_OLD))
801 report_complete(stdout, GT_(" not flushed\n"));
803 /* maybe we mark this message as seen now? */
804 if (ctl->server.base_protocol->mark_seen
806 && (msgcode >= 0 && ctl->keep))
808 err = (ctl->server.base_protocol->mark_seen)(mailserver_socket, ctl, num);
814 /* perhaps this as many as we're ready to handle */
815 if (maxfetch && maxfetch <= *fetches && num < count)
817 int remcount = count - (*fetches - initialfetches);
819 ngettext("fetchlimit %d reached; %d message left on server %s account %s\n",
820 "fetchlimit %d reached; %d messages left on server %s account %s\n", remcount),
821 maxfetch, remcount, ctl->server.truename, ctl->remotename);
824 } /* for (num = 1; num <= count; num++) */
829 /* retrieve messages from server using given protocol method table */
830 static int do_session(
831 /* parsed options with merged-in defaults */
833 /* protocol method table */
834 const struct method *proto,
835 /* maximum number of messages to fetch */
838 static int *msgsizes;
839 volatile int err, mailserver_socket = -1; /* pacifies -Wall */
841 int deletions = 0, js;
843 SIGHANDLERTYPE alrmsave;
845 ctl->server.base_protocol = proto;
850 init_transact(proto);
852 /* set up the server-nonresponse timeout */
853 alrmsave = set_signal_handler(SIGALRM, timeout_handler);
854 mytimeout = ctl->server.timeout;
856 if ((js = sigsetjmp(restart,1)))
858 /* exception caught */
861 sigfillset(&allsigs);
862 sigprocmask(SIG_UNBLOCK, &allsigs, NULL);
865 fm_freeaddrinfo(ai0); ai0 = NULL;
869 fm_freeaddrinfo(ai1); ai1 = NULL;
872 if (js == THROW_TIMEOUT)
874 if (phase == OPEN_WAIT)
876 GT_("timeout after %d seconds waiting to connect to server %s.\n"),
877 ctl->server.timeout, ctl->server.pollname);
878 else if (phase == SERVER_WAIT)
880 GT_("timeout after %d seconds waiting for server %s.\n"),
881 ctl->server.timeout, ctl->server.pollname);
882 else if (phase == FORWARDING_WAIT)
884 GT_("timeout after %d seconds waiting for %s.\n"),
886 ctl->mda ? "MDA" : "SMTP");
887 else if (phase == LISTENER_WAIT)
889 GT_("timeout after %d seconds waiting for listener to respond.\n"), ctl->server.timeout);
892 GT_("timeout after %d seconds.\n"), ctl->server.timeout);
895 * If we've exceeded our threshold for consecutive timeouts,
896 * try to notify the user, then mark the connection wedged.
897 * Don't do this if the connection can idle, though; idle
898 * timeouts just mean the frequency of mail is low.
900 if (timeoutcount > MAX_TIMEOUTS
901 && !open_warning_by_mail(ctl))
903 stuff_warning(iana_charset, ctl,
904 GT_("Subject: fetchmail sees repeated timeouts"));
905 stuff_warning(NULL, ctl, "%s", "");
906 stuff_warning(NULL, ctl,
907 GT_("Fetchmail saw more than %d timeouts while attempting to get mail from %s@%s.\n"),
909 ctl->remotename, ctl->server.truename);
910 stuff_warning(NULL, ctl,
911 GT_("This could mean that your mailserver is stuck, or that your SMTP\n" \
912 "server is wedged, or that your mailbox file on the server has been\n" \
913 "corrupted by a server error. You can run `fetchmail -v -v' to\n" \
914 "diagnose the problem.\n\n" \
915 "Fetchmail won't poll this mailbox again until you restart it.\n"));
916 close_warning_by_mail(ctl, (struct msgblk *)NULL);
926 /* sigsetjmp returned zero -> normal operation */
927 char buf[MSGBUFSIZE+1], *realhost;
928 int count, newm, bytes;
929 int fetches, dispatches, oldphase;
932 /* execute pre-initialization command, if any */
933 if (ctl->preconnect && (err = system(ctl->preconnect)))
936 GT_("pre-connection command failed with status %d\n"), err);
941 /* open a socket to the mail server */
944 set_timeout(mytimeout);
946 #ifdef HAVE_PKG_hesiod
947 /* If either the pollname or vianame are "hesiod" we want to
948 lookup the user's hesiod pobox host */
949 if (!strcasecmp(ctl->server.queryname, "hesiod")) {
950 struct hes_postoffice *hes_p;
951 hes_p = hes_getmailhost(ctl->remotename);
952 if (hes_p != NULL && strcmp(hes_p->po_type, "POP") == 0) {
953 free(ctl->server.queryname);
954 ctl->server.queryname = xstrdup(hes_p->po_host);
956 free(ctl->server.via);
957 ctl->server.via = xstrdup(hes_p->po_host);
960 GT_("couldn't find HESIOD pobox for %s\n"),
967 * Canonicalize the server truename for later use. This also
968 * functions as a probe for whether the mailserver is accessible.
969 * We try it on each poll cycle until we get a result. This way,
970 * fetchmail won't fail if started up when the network is inaccessible.
972 if (ctl->server.dns && !ctl->server.trueaddr)
974 if (ctl->server.lead_server)
976 char *leadname = ctl->server.lead_server->truename;
978 /* prevent core dump from ill-formed or duplicate entry */
981 report(stderr, GT_("Lead server has no name.\n"));
988 xfree(ctl->server.truename);
989 ctl->server.truename = xstrdup(leadname);
993 struct addrinfo hints, *res;
996 memset(&hints, 0, sizeof(hints));
997 hints.ai_socktype = SOCK_STREAM;
998 hints.ai_family = AF_UNSPEC;
999 hints.ai_flags = AI_CANONNAME;
1001 error = fm_getaddrinfo(ctl->server.queryname, NULL, &hints, &res);
1005 GT_("couldn't find canonical DNS name of %s (%s): %s\n"),
1006 ctl->server.pollname, ctl->server.queryname,
1007 gai_strerror(error));
1015 xfree(ctl->server.truename);
1016 /* Older FreeBSD versions return NULL in ai_canonname
1017 * if they cannot canonicalize, rather than copying
1018 * the queryname here, as IEEE Std 1003.1-2001
1019 * requires. Work around NULL. */
1020 if (res->ai_canonname != NULL) {
1021 ctl->server.truename = xstrdup(res->ai_canonname);
1023 ctl->server.truename = xstrdup(ctl->server.queryname);
1025 ctl->server.trueaddr = (struct sockaddr *)xmalloc(res->ai_addrlen);
1026 ctl->server.trueaddr_len = res->ai_addrlen;
1027 memcpy(ctl->server.trueaddr, res->ai_addr, res->ai_addrlen);
1028 fm_freeaddrinfo(res);
1033 realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname;
1035 /* allow time for the port to be set up if we have a plugin */
1036 if (ctl->server.plugin)
1038 if ((mailserver_socket = SockOpen(realhost,
1039 ctl->server.service ? ctl->server.service : ( ctl->use_ssl ? ctl->server.base_protocol->sslservice : ctl->server.base_protocol->service ),
1040 ctl->server.plugin, &ai0)) == -1)
1042 char errbuf[BUFSIZ];
1045 * Avoid generating a bogus error every poll cycle when we're
1046 * in daemon mode but the connection to the outside world
1049 if (!((err_no == EHOSTUNREACH || err_no == ENETUNREACH)
1050 && run.poll_interval))
1052 report_build(stderr, GT_("%s connection to %s failed"),
1053 ctl->server.base_protocol->name, ctl->server.pollname);
1054 strlcpy(errbuf, strerror(err_no), sizeof(errbuf));
1055 report_complete(stderr, ": %s\n", errbuf);
1059 * Don't use this. It was an attempt to address Debian bug
1060 * #47143 (Notify user by mail when pop server nonexistent).
1061 * Trouble is, that doesn't work; you trip over the case
1062 * where your SLIP or PPP link is down...
1064 /* warn the system administrator */
1065 if (open_warning_by_mail(ctl) == 0)
1067 stuff_warning(iana_charset, ctl,
1068 GT_("Subject: Fetchmail unreachable-server warning."));
1069 stuff_warning(NULL, ctl, "");
1070 stuff_warning(NULL, ctl, GT_("Fetchmail could not reach the mail server %s:"),
1071 ctl->server.pollname);
1072 stuff_warning(NULL, ctl, errbuf, ctl->server.pollname);
1073 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1084 /* Save the socket opened. Useful if Fetchmail hangs on SSLOpen
1085 * because the socket can be closed.
1087 mailserver_socket_temp = mailserver_socket;
1088 set_timeout(mytimeout);
1090 /* perform initial SSL handshake on open connection */
1092 SSLOpen(mailserver_socket, ctl->sslcert, ctl->sslkey,
1093 ctl->sslproto, ctl->sslcertck, ctl->sslcertpath,
1094 ctl->sslfingerprint, ctl->sslcommonname ?
1095 ctl->sslcommonname : realhost, ctl->server.pollname,
1096 &ctl->remotename) == -1)
1098 report(stderr, GT_("SSL connection failed.\n"));
1103 /* Fetchmail didn't hang on SSLOpen,
1104 * then no need to set mailserver_socket_temp
1106 mailserver_socket_temp = -1;
1109 /* A timeout is still defined before SSLOpen,
1110 * then Fetchmail hanging on SSLOpen is handled.
1115 if (ctl->server.authenticate == A_KERBEROS_V4 && (strcasecmp(proto->name,"IMAP") != 0))
1117 set_timeout(mytimeout);
1118 err = kerberos_auth(mailserver_socket, ctl->server.truename,
1119 ctl->server.principal);
1124 #endif /* KERBEROS_V4 */
1127 if (ctl->server.authenticate == A_KERBEROS_V5)
1129 set_timeout(mytimeout);
1130 err = kerberos5_auth(mailserver_socket, ctl->server.truename);
1135 #endif /* KERBEROS_V5 */
1137 /* accept greeting message from mail server */
1138 err = (ctl->server.base_protocol->parse_response)(mailserver_socket, buf);
1142 /* try to get authorized to fetch mail */
1143 stage = STAGE_GETAUTH;
1144 if (ctl->server.base_protocol->getauth)
1146 err = (ctl->server.base_protocol->getauth)(mailserver_socket, ctl, buf);
1150 if (err == PS_LOCKBUSY)
1151 report(stderr, GT_("Lock-busy error on %s@%s\n"),
1153 ctl->server.truename);
1154 else if (err == PS_SERVBUSY)
1155 report(stderr, GT_("Server busy error on %s@%s\n"),
1157 ctl->server.truename);
1158 else if (err == PS_AUTHFAIL)
1160 report(stderr, GT_("Authorization failure on %s@%s%s\n"),
1162 ctl->server.truename,
1163 (ctl->wehaveauthed ? GT_(" (previously authorized)") : "")
1167 * If we're running in background, try to mail the
1168 * calling user a heads-up about the authentication
1169 * failure once it looks like this isn't a fluke
1170 * due to the server being temporarily inaccessible.
1171 * When we get third succesive failure, we notify the user
1172 * but only if we haven't already managed to get
1173 * authorization. After that, once we get authorization
1174 * we let the user know service is restored.
1176 if (run.poll_interval
1177 && !ctl->wehavesentauthnote
1178 && ((ctl->wehaveauthed && ++ctl->authfailcount >= 10)
1179 || (!ctl->wehaveauthed && ++ctl->authfailcount >= 3))
1180 && !open_warning_by_mail(ctl))
1182 ctl->wehavesentauthnote = 1;
1183 stuff_warning(iana_charset, ctl,
1184 GT_("Subject: fetchmail authentication failed on %s@%s"),
1185 ctl->remotename, ctl->server.truename);
1186 stuff_warning(NULL, ctl, "%s", "");
1187 stuff_warning(NULL, ctl,
1188 GT_("Fetchmail could not get mail from %s@%s.\n"),
1190 ctl->server.truename);
1191 if (ctl->wehaveauthed) {
1192 stuff_warning(NULL, ctl, GT_("\
1193 The attempt to get authorization failed.\n\
1194 Since we have already succeeded in getting authorization for this\n\
1195 connection, this is probably another failure mode (such as busy server)\n\
1196 that fetchmail cannot distinguish because the server didn't send a useful\n\
1198 stuff_warning(NULL, ctl, GT_("\
1200 However, if you HAVE changed your account details since starting the\n\
1201 fetchmail daemon, you need to stop the daemon, change your configuration\n\
1202 of fetchmail, and then restart the daemon.\n\
1204 The fetchmail daemon will continue running and attempt to connect\n\
1205 at each cycle. No future notifications will be sent until service\n\
1208 stuff_warning(NULL, ctl, GT_("\
1209 The attempt to get authorization failed.\n\
1210 This probably means your password is invalid, but some servers have\n\
1211 other failure modes that fetchmail cannot distinguish from this\n\
1212 because they don't send useful error messages on login failure.\n\
1214 The fetchmail daemon will continue running and attempt to connect\n\
1215 at each cycle. No future notifications will be sent until service\n\
1218 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1221 else if (err == PS_REPOLL)
1223 if (outlevel >= O_VERBOSE)
1224 report(stderr, GT_("Repoll immediately on %s@%s\n"),
1226 ctl->server.truename);
1229 report(stderr, GT_("Unknown login or authentication error on %s@%s\n"),
1231 ctl->server.truename);
1238 * This connection has given us authorization at least once.
1240 * There are dodgy server (clubinternet.fr for example) that
1241 * give spurious authorization failures on patently good
1242 * account/password details, then 5 minutes later let you in!
1244 * This is meant to build in some tolerance of such nasty bits
1247 ctl->wehaveauthed = 1;
1248 /*if (ctl->authfailcount >= 3)*/
1249 if (ctl->wehavesentauthnote)
1251 ctl->wehavesentauthnote = 0;
1253 GT_("Authorization OK on %s@%s\n"),
1255 ctl->server.truename);
1256 if (!open_warning_by_mail(ctl))
1258 stuff_warning(iana_charset, ctl,
1259 GT_("Subject: fetchmail authentication OK on %s@%s"),
1260 ctl->remotename, ctl->server.truename);
1261 stuff_warning(NULL, ctl, "%s", "");
1262 stuff_warning(NULL, ctl,
1263 GT_("Fetchmail was able to log into %s@%s.\n"),
1265 ctl->server.truename);
1266 stuff_warning(NULL, ctl,
1267 GT_("Service has been restored.\n"));
1268 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1273 * Reporting only after the first three
1274 * consecutive failures, or ten consecutive
1275 * failures after we have managed to get
1278 ctl->authfailcount = 0;
1282 ctl->errcount = fetches = 0;
1284 /* now iterate over each folder selected */
1285 for (idp = ctl->mailboxes; idp; idp = idp->next)
1287 ctl->folder = idp->id;
1293 /* reset timeout, in case we did an IDLE */
1294 mytimeout = ctl->server.timeout;
1296 if (outlevel >= O_DEBUG)
1299 report(stdout, GT_("selecting or re-polling folder %s\n"), idp->id);
1301 report(stdout, GT_("selecting or re-polling default folder\n"));
1304 /* compute # of messages and number of new messages waiting */
1305 stage = STAGE_GETRANGE;
1306 err = (ctl->server.base_protocol->getrange)(mailserver_socket, ctl, idp->id, &count, &newm, &bytes);
1310 /* show user how many messages we downloaded */
1312 (void) snprintf(buf, sizeof(buf),
1313 GT_("%s at %s (folder %s)"),
1314 ctl->remotename, ctl->server.pollname, idp->id);
1316 (void) snprintf(buf, sizeof(buf), GT_("%s at %s"),
1317 ctl->remotename, ctl->server.pollname);
1318 if (outlevel > O_SILENT)
1320 if (count == -1) /* only used for ETRN */
1321 report(stdout, GT_("Polling %s\n"), ctl->server.truename);
1322 else if (count != 0)
1324 if (newm != -1 && (count - newm) > 0)
1325 report_build(stdout, ngettext("%d message (%d %s) for %s", "%d messages (%d %s) for %s", (unsigned long)count),
1328 ngettext("seen", "seen", (unsigned long)count-newm),
1331 report_build(stdout, ngettext("%d message for %s",
1332 "%d messages for %s",
1336 report_complete(stdout, ".\n");
1338 report_complete(stdout, GT_(" (%d octets).\n"), bytes);
1342 /* these are pointless in normal daemon mode */
1343 if (pass == 1 && (run.poll_interval == 0 || outlevel >= O_VERBOSE))
1344 report(stdout, GT_("No mail for %s\n"), buf);
1348 /* very important, this is where we leave the do loop */
1354 if (newm == -1 || ctl->fetchall)
1356 fetches = newm; /* set error status correctly */
1358 * There used to be a `goto noerror' here, but this
1359 * prevented checking of multiple folders. This
1360 * comment is a reminder in case I introduced some
1361 * subtle bug by removing it...
1369 * Don't trust the message count passed by the server.
1370 * Without this check, it might be possible to do a
1371 * DNS-spoofing attack that would pass back a ridiculous
1372 * count, and allocate a malloc area that would overlap
1373 * a portion of the stack.
1375 if ((unsigned)count > INT_MAX/sizeof(int))
1377 report(stderr, GT_("bogus message count!"));
1383 * We need the size of each message before it's
1384 * loaded in order to pass it to the ESMTP SIZE
1385 * option. If the protocol has a getsizes method,
1386 * we presume this means it doesn't get reliable
1387 * sizes from message fetch responses.
1389 * If the protocol supports getting sizes of subset of
1390 * messages, we skip this step now.
1392 if (proto->getsizes &&
1393 !(proto->getpartialsizes && NUM_NONZERO(ctl->fetchsizelimit)))
1396 msgsizes = (int *)xmalloc(sizeof(int) * count);
1397 for (i = 0; i < count; i++)
1400 stage = STAGE_GETSIZES;
1401 err = (proto->getsizes)(mailserver_socket, count, msgsizes);
1408 for (i = 0; i < count; i++)
1409 bytes += msgsizes[i];
1413 /* read, forward, and delete messages */
1414 stage = STAGE_FETCH;
1416 /* fetch in lockstep mode */
1417 err = fetch_messages(mailserver_socket, ctl,
1420 &fetches, &dispatches, &deletions);
1421 if (err != PS_SUCCESS && err != PS_MAXFETCH)
1424 if (!check_only && ctl->skipped
1425 && run.poll_interval > 0 && !nodetach)
1427 clean_skipped_list(&ctl->skipped);
1428 send_size_warnings(ctl);
1432 /* end-of-mailbox processing before we repoll or switch to another one */
1433 if (ctl->server.base_protocol->end_mailbox_poll)
1435 err = (ctl->server.base_protocol->end_mailbox_poll)(mailserver_socket, ctl);
1439 /* Return now if we have reached the fetchlimit */
1440 if (maxfetch && maxfetch <= fetches)
1444 * Only repoll if we either had some actual forwards
1445 * or are idling for new mails and had no errors.
1446 * Otherwise it is far too easy to get into infinite loops.
1448 (ctl->server.base_protocol->retry && (dispatches || ctl->idle) && !ctl->errcount);
1451 /* XXX: From this point onwards, preserve err unless a new error has occurred */
1454 /* PS_SUCCESS, PS_MAXFETCH: ordinary termination with no errors -- officially log out */
1455 stage = STAGE_LOGOUT;
1456 tmperr = (ctl->server.base_protocol->logout_cmd)(mailserver_socket, ctl);
1457 if (tmperr != PS_SUCCESS)
1460 * Hmmmm...arguably this would be incorrect if we had fetches but
1461 * no dispatches (due to oversized messages, etc.)
1463 else if (err == PS_SUCCESS && fetches == 0)
1466 * Close all SMTP delivery sockets. For optimum performance
1467 * we'd like to hold them open til end of run, but (1) this
1468 * loses if our poll interval is longer than the MTA's
1469 * inactivity timeout, and (2) some MTAs (like smail) don't
1470 * deliver after each message, but rather queue up mail and
1471 * wait to actually deliver it until the input socket is
1474 * don't send QUIT for ODMR case because we're acting as a
1475 * proxy between the SMTP server and client.
1477 smtp_close(ctl, ctl->server.protocol != P_ODMR);
1478 cleanupSockClose(mailserver_socket);
1482 /* we only get here on error */
1483 if (err != 0 && err != PS_SOCKET && err != PS_REPOLL)
1485 stage = STAGE_LOGOUT;
1486 (ctl->server.base_protocol->logout_cmd)(mailserver_socket, ctl);
1489 /* try to clean up all streams */
1492 * Sending SMTP QUIT on signal is theoretically nice, but led
1493 * to a subtle bug. If fetchmail was terminated by signal
1494 * while it was shipping message text, it would hang forever
1495 * waiting for a command acknowledge. In theory we could
1496 * enable the QUIT only outside of the message send. In
1497 * practice, we don't care. All mailservers hang up on a
1498 * dropped TCP/IP connection anyway.
1501 if (mailserver_socket != -1) {
1502 cleanupSockClose(mailserver_socket);
1503 mailserver_socket = -1;
1505 /* If there was a connect timeout, the socket should be closed.
1506 * mailserver_socket_temp contains the socket to close.
1508 if (mailserver_socket_temp != -1) {
1509 cleanupSockClose(mailserver_socket_temp);
1510 mailserver_socket_temp = -1;
1514 /* no report on PS_AUTHFAIL */
1519 msg = GT_("socket");
1522 msg = GT_("missing or bad RFC822 header");
1528 msg = GT_("client/server synchronization");
1531 msg = GT_("client/server protocol");
1534 msg = GT_("lock busy on server");
1537 msg = GT_("SMTP transaction");
1540 msg = GT_("DNS lookup");
1543 msg = GT_("undefined");
1547 if (phase == FORWARDING_WAIT || phase == LISTENER_WAIT
1549 report(stderr, GT_("%s error while fetching from %s@%s and delivering to SMTP host %s\n"),
1550 msg, ctl->remotename, ctl->server.pollname,
1551 ctl->smtphost ? ctl->smtphost : GT_("unknown"));
1553 report(stderr, GT_("%s error while fetching from %s@%s\n"),
1554 msg, ctl->remotename, ctl->server.pollname);
1561 /* execute wrapup command, if any */
1562 if (ctl->postconnect && (tmperr = system(ctl->postconnect)))
1564 report(stderr, GT_("post-connection command failed with status %d\n"), tmperr);
1565 if (err == PS_SUCCESS)
1569 set_timeout(0); /* cancel any pending alarm */
1570 set_signal_handler(SIGALRM, alrmsave);
1574 /** retrieve messages from server using given protocol method table */
1575 int do_protocol(struct query *ctl /** parsed options with merged-in defaults */,
1576 const struct method *proto /** protocol method table */)
1581 if (ctl->server.authenticate == A_KERBEROS_V4)
1583 report(stderr, GT_("Kerberos V4 support not linked.\n"));
1586 #endif /* KERBEROS_V4 */
1589 if (ctl->server.authenticate == A_KERBEROS_V5)
1591 report(stderr, GT_("Kerberos V5 support not linked.\n"));
1594 #endif /* KERBEROS_V5 */
1596 /* lacking methods, there are some options that may fail */
1599 /* check for unsupported options */
1602 GT_("Option --flush is not supported with %s\n"),
1606 else if (ctl->fetchall) {
1608 GT_("Option --all is not supported with %s\n"),
1613 if (!(proto->getsizes || proto->getpartialsizes)
1614 && NUM_SPECIFIED(ctl->limit))
1617 GT_("Option --limit is not supported with %s\n"),
1623 * If no expunge limit or we do expunges within the driver,
1624 * then just do one session, passing in any fetchlimit.
1626 if ((ctl->keep && !ctl->flush) ||
1627 proto->retry || !NUM_SPECIFIED(ctl->expunge))
1628 return(do_session(ctl, proto, NUM_VALUE_OUT(ctl->fetchlimit)));
1630 * There's an expunge limit, and it isn't handled in the driver itself.
1631 * OK; do multiple sessions, each fetching a limited # of messages.
1632 * Stop if the total count of retrieved messages exceeds ctl->fetchlimit
1633 * (if it was nonzero).
1639 int expunge = NUM_VALUE_OUT(ctl->expunge);
1640 int fetchlimit = NUM_VALUE_OUT(ctl->fetchlimit);
1643 if (fetchlimit > 0 && (expunge == 0 || expunge > fetchlimit - totalcount))
1644 expunge = fetchlimit - totalcount;
1645 err = do_session(ctl, proto, expunge);
1646 totalcount += expunge;
1647 if (NUM_SPECIFIED(ctl->fetchlimit) && totalcount >= fetchlimit)
1649 if (err != PS_LOCKBUSY)
1651 else if (lockouts >= MAX_LOCKOUTS)
1653 else /* err == PS_LOCKBUSY */
1656 * Allow time for the server lock to release. if we
1657 * don't do this, we'll often hit a locked-mailbox
1658 * condition and fail.
1664 (err == PS_MAXFETCH || err == PS_LOCKBUSY);
1671 /* driver.c ends here */