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 */
58 #define THROW_SIGPIPE 2 /* SIGPIPE on stream socket */
60 /* magic values for the message length array */
61 #define MSGLEN_UNKNOWN 0 /* length unknown (0 is impossible) */
62 #define MSGLEN_INVALID -1 /* length passed back is invalid */
63 #define MSGLEN_TOOLARGE -2 /* message is too large */
64 #define MSGLEN_OLD -3 /* message is old */
66 int pass; /* how many times have we re-polled? */
67 int stage; /* where are we? */
68 int phase; /* where are we, for error-logging purposes? */
69 int batchcount; /* count of messages sent in current batch */
70 flag peek_capable; /* can we peek for better error recovery? */
71 int mailserver_socket_temp = -1; /* socket to free if connect timeout */
73 static volatile int timeoutcount = 0; /* count consecutive timeouts */
74 static volatile int idletimeout = 0; /* timeout occured in idle stage? */
76 static jmp_buf restart;
78 int is_idletimeout(void)
79 /* last timeout occured in idle stage? */
84 void resetidletimeout(void)
89 void set_timeout(int timeleft)
90 /* reset the nonresponse-timeout */
92 #if !defined(__EMX__) && !defined(__BEOS__)
93 struct itimerval ntimeout;
98 ntimeout.it_interval.tv_sec = ntimeout.it_interval.tv_usec = 0;
99 ntimeout.it_value.tv_sec = timeleft;
100 ntimeout.it_value.tv_usec = 0;
101 setitimer(ITIMER_REAL, &ntimeout, (struct itimerval *)NULL);
105 static RETSIGTYPE timeout_handler (int signal)
106 /* handle SIGALRM signal indicating a server timeout */
109 if(stage != STAGE_IDLE) {
111 longjmp(restart, THROW_TIMEOUT);
116 static RETSIGTYPE sigpipe_handler (int signal)
117 /* handle SIGPIPE signal indicating a broken stream socket */
120 longjmp(restart, THROW_SIGPIPE);
123 #define CLEANUP_TIMEOUT 60 /* maximum timeout during cleanup */
125 static int cleanupSockClose (int fd)
126 /* close sockets in maximum CLEANUP_TIMEOUT seconds during cleanup */
129 SIGHANDLERTYPE alrmsave;
130 alrmsave = set_signal_handler(SIGALRM, null_signal_handler);
131 set_timeout(CLEANUP_TIMEOUT);
132 scerror = SockClose(fd);
134 set_signal_handler(SIGALRM, alrmsave);
139 static int kerberos_auth(socket, canonical, principal)
140 /* authenticate to the server host using Kerberos V4 */
141 int socket; /* socket to server host */
142 char *canonical; /* server name */
148 Key_schedule schedule;
150 char * prin_copy = (char *) NULL;
151 char * prin = (char *) NULL;
152 char * inst = (char *) NULL;
153 char * realm = (char *) NULL;
155 if (principal != (char *)NULL && *principal)
158 prin = prin_copy = xstrdup(principal);
159 for (cp = prin_copy; *cp && *cp != '.'; ++cp)
165 while (*cp && *cp != '@')
175 ticket = xmalloc(sizeof (KTEXT_ST));
176 rem = (krb_sendauth (0L, socket, ticket,
178 inst ? inst : canonical,
179 realm ? realm : ((char *) (krb_realmofhost (canonical))),
184 ((struct sockaddr_in *) 0),
185 ((struct sockaddr_in *) 0),
194 report(stderr, GT_("kerberos error %s\n"), (krb_get_err_text (rem)));
195 return (PS_AUTHFAIL);
199 #endif /* KERBEROS_V4 */
202 static int kerberos5_auth(socket, canonical)
203 /* authenticate to the server host using Kerberos V5 */
204 int socket; /* socket to server host */
205 const char *canonical; /* server name */
207 krb5_error_code retval;
208 krb5_context context;
210 krb5_principal client = NULL, server = NULL;
211 krb5_error *err_ret = NULL;
213 krb5_auth_context auth_context = NULL;
215 krb5_init_context(&context);
216 krb5_auth_con_init(context, &auth_context);
218 if ((retval = krb5_cc_default(context, &ccdef))) {
219 report(stderr, "krb5_cc_default: %s\n", error_message(retval));
223 if ((retval = krb5_cc_get_principal(context, ccdef, &client))) {
224 report(stderr, "krb5_cc_get_principal: %s\n", error_message(retval));
228 if ((retval = krb5_sname_to_principal(context, canonical, "pop",
231 report(stderr, "krb5_sname_to_principal: %s\n", error_message(retval));
235 retval = krb5_sendauth(context, &auth_context, (krb5_pointer) &socket,
236 "KPOPV1.0", client, server,
237 AP_OPTS_MUTUAL_REQUIRED,
238 NULL, /* no data to checksum */
239 0, /* no creds, use ccache instead */
243 NULL); /* don't need reply */
245 krb5_free_principal(context, server);
246 krb5_free_principal(context, client);
247 krb5_auth_con_free(context, auth_context);
251 if (err_ret && err_ret->e_text) {
252 report(stderr, GT_("krb5_sendauth: %s [server says '%*s'] \n"),
253 error_message(retval),
256 if (err_ret && err_ret->text.length) {
257 report(stderr, GT_("krb5_sendauth: %s [server says '%*s'] \n"),
258 error_message(retval),
259 err_ret->text.length,
262 krb5_free_error(context, err_ret);
264 report(stderr, "krb5_sendauth: %s\n", error_message(retval));
270 #endif /* KERBEROS_V5 */
272 static void clean_skipped_list(struct idlist **skipped_list)
273 /* struct "idlist" contains no "prev" ptr; we must remove unused items first */
275 struct idlist *current=NULL, *prev=NULL, *tmp=NULL, *head=NULL;
276 prev = current = head = *skipped_list;
282 /* if item has no reference, remove it */
283 if (current && current->val.status.mark == 0)
285 if (current == head) /* remove first item (head) */
287 head = current->next;
288 if (current->id) free(current->id);
290 prev = current = head;
292 else /* remove middle/last item */
296 if (current->id) free(current->id);
301 else /* skip this item */
304 current = current->next;
308 *skipped_list = head;
311 static void send_size_warnings(struct query *ctl)
312 /* send warning mail with skipped msg; reset msg count when user notified */
315 int msg_to_send = FALSE;
316 struct idlist *head=NULL, *current=NULL;
317 int max_warning_poll_count;
323 /* don't start a notification message unless we need to */
324 for (current = head; current; current = current->next)
325 if (current->val.status.num == 0 && current->val.status.mark)
331 * There's no good way to recover if we can't send notification mail,
332 * but it's not a disaster, either, since the skipped mail will not
335 if (open_warning_by_mail(ctl))
337 stuff_warning(iana_charset, ctl,
338 GT_("Subject: Fetchmail oversized-messages warning"));
339 stuff_warning(NULL, ctl, "%s", "");
341 stuff_warning(NULL, ctl,
342 GT_("The following oversized messages were deleted on server %s account %s:"),
343 ctl->server.pollname, ctl->remotename);
345 stuff_warning(NULL, ctl,
346 GT_("The following oversized messages remain on server %s account %s:"),
347 ctl->server.pollname, ctl->remotename);
349 stuff_warning(NULL, ctl, "%s", "");
351 if (run.poll_interval == 0)
352 max_warning_poll_count = 0;
354 max_warning_poll_count = ctl->warnings/run.poll_interval;
356 /* parse list of skipped msg, adding items to the mail */
357 for (current = head; current; current = current->next)
359 if (current->val.status.num == 0 && current->val.status.mark)
361 nbr = current->val.status.mark;
362 size = atoi(current->id);
364 stuff_warning(NULL, ctl,
365 GT_(" %d msg %d octets long deleted by fetchmail."),
368 stuff_warning(NULL, ctl,
369 GT_(" %d msg %d octets long skipped by fetchmail."),
372 current->val.status.num++;
373 current->val.status.mark = 0;
375 if (current->val.status.num >= max_warning_poll_count)
376 current->val.status.num = 0;
379 stuff_warning(NULL, ctl, "%s", "");
381 close_warning_by_mail(ctl, (struct msgblk *)NULL);
384 static void mark_oversized(struct query *ctl, int size)
385 /* mark a message oversized */
387 struct idlist *current=NULL, *tmp=NULL;
391 /* convert size to string */
392 snprintf(sizestr, sizeof(sizestr), "%d", size);
394 /* build a list of skipped messages
395 * val.id = size of msg (string cnvt)
396 * val.status.num = warning_poll_count
397 * val.status.mask = nbr of msg this size
400 current = ctl->skipped;
402 /* initialise warning_poll_count to the
403 * current value so that all new msg will
404 * be included in the next mail
406 cnt = current ? current->val.status.num : 0;
408 /* if entry exists, increment the count */
409 if (current && (tmp = str_in_list(¤t, sizestr, FALSE)))
411 tmp->val.status.mark++;
413 /* otherwise, create a new entry */
414 /* initialise with current poll count */
417 tmp = save_str(&ctl->skipped, sizestr, 1);
418 tmp->val.status.num = cnt;
422 static int fetch_messages(int mailserver_socket, struct query *ctl,
423 int count, int **msgsizes, int maxfetch,
424 int *fetches, int *dispatches, int *deletions)
425 /* fetch messages in lockstep mode */
427 flag force_retrieval;
428 int num, firstnum = 1, lastnum = 0, err, len;
429 int fetchsizelimit = ctl->fetchsizelimit;
431 int initialfetches = *fetches;
433 if (ctl->server.base_protocol->getpartialsizes && NUM_NONZERO(fetchsizelimit))
435 /* for POP3, we can get the size of one mail only! Unfortunately, this
436 * protocol specific test cannot be done elsewhere as the protocol
437 * could be "auto". */
438 switch (ctl->server.protocol)
440 case P_POP3: case P_APOP: case P_RPOP:
444 /* Time to allocate memory to store the sizes */
446 *msgsizes = xmalloc(sizeof(int) * fetchsizelimit);
450 * What forces this code is that in POP2 and
451 * IMAP2bis you can't fetch a message without
452 * having it marked `seen'. In POP3 and IMAP4, on the
453 * other hand, you can (peek_capable is set by
454 * each driver module to convey this; it's not a
455 * method constant because of the difference between
456 * IMAP2bis and IMAP4, and because POP3 doesn't peek
457 * if fetchall is on).
459 * The result of being unable to peek is that if there's
460 * any kind of transient error (DNS lookup failure, or
461 * sendmail refusing delivery due to process-table limits)
462 * the message will be marked "seen" on the server without
463 * having been delivered. This is not a big problem if
464 * fetchmail is running in foreground, because the user
465 * will see a "skipped" message when it next runs and get
468 * But in daemon mode this leads to the message
469 * being silently ignored forever. This is not
472 * We compensate for this by checking the error
473 * count from the previous pass and forcing all
474 * messages to be considered new if it's nonzero.
476 force_retrieval = !peek_capable && (ctl->errcount > 0);
478 for (num = 1; num <= count; num++)
480 flag suppress_delete = FALSE;
481 flag suppress_forward = FALSE;
482 flag suppress_readbody = FALSE;
483 flag retained = FALSE;
484 int msgcode = MSGLEN_UNKNOWN;
486 /* check if the message is old
487 * Note: the size of the message may not be known here */
488 if (ctl->fetchall || force_retrieval)
490 else if (ctl->server.base_protocol->is_old && (ctl->server.base_protocol->is_old)(mailserver_socket,ctl,num))
491 msgcode = MSGLEN_OLD;
492 if (msgcode == MSGLEN_OLD)
494 /* To avoid flooding the syslog when using --keep,
495 * report "Skipped message" only when:
496 * 1) --verbose is on, or
497 * 2) fetchmail does not use syslog
499 if ( (outlevel >= O_VERBOSE) ||
500 (outlevel > O_SILENT && !run.use_syslog)
504 GT_("skipping message %s@%s:%d"),
505 ctl->remotename, ctl->server.truename, num);
511 if (ctl->server.base_protocol->getpartialsizes && NUM_NONZERO(fetchsizelimit) &&
514 /* Instead of getting the sizes of all mails at the start, we get
515 * the sizes in blocks of fetchsizelimit. This leads to better
516 * performance when there are too many mails (say, 10000) in
517 * the mailbox and either we are not getting all the mails at
518 * one go (--fetchlimit 100) or there is a frequent socket
519 * error while just getting the sizes of all mails! */
522 int oldstage = stage;
524 lastnum = num + fetchsizelimit - 1;
527 for (i = 0; i < fetchsizelimit; i++)
530 stage = STAGE_GETSIZES;
531 err = (ctl->server.base_protocol->getpartialsizes)(mailserver_socket, num, lastnum, *msgsizes);
538 msgsize = *msgsizes ? (*msgsizes)[num-firstnum] : 0;
540 /* check if the message is oversized */
541 if (NUM_NONZERO(ctl->limit) && (msgsize > ctl->limit))
542 msgcode = MSGLEN_TOOLARGE;
543 /* else if (msgsize == 512)
544 msgcode = MSGLEN_OLD; (hmh) sample code to skip message */
548 if (msgcode == MSGLEN_TOOLARGE)
550 mark_oversized(ctl, msgsize);
551 if (!ctl->limitflush)
552 suppress_delete = TRUE;
554 if (outlevel > O_SILENT)
556 /* old messages are already handled above */
558 GT_("skipping message %s@%s:%d (%d octets)"),
559 ctl->remotename, ctl->server.truename, num,
565 * Invalid lengths are produced by Post Office/NT's
566 * annoying habit of randomly prepending bogus
567 * LIST items of length -1. Patrick Audley
568 * <paudley@pobox.com> tells us: LIST shows a
569 * size of -1, RETR and TOP return "-ERR
570 * System error - couldn't open message", and
571 * DELE succeeds but doesn't actually delete
574 report_build(stdout, GT_(" (length -1)"));
576 case MSGLEN_TOOLARGE:
577 report_build(stdout, GT_(" (oversized)"));
584 flag wholesize = !ctl->server.base_protocol->fetch_body;
585 flag separatefetchbody = (ctl->server.base_protocol->fetch_body) ? TRUE : FALSE;
587 /* request a message */
588 err = (ctl->server.base_protocol->fetch_headers)(mailserver_socket,ctl,num, &len);
589 if (err == PS_TRANSIENT) /* server is probably Exchange */
592 GT_("couldn't fetch headers, message %s@%s:%d (%d octets)\n"),
593 ctl->remotename, ctl->server.truename, num,
600 /* -1 means we didn't see a size in the response */
607 if (outlevel > O_SILENT)
609 report_build(stdout, GT_("reading message %s@%s:%d of %d"),
610 ctl->remotename, ctl->server.truename,
614 report_build(stdout, wholesize ? GT_(" (%d octets)")
615 : GT_(" (%d header octets)"), len);
616 if (outlevel >= O_VERBOSE)
617 report_complete(stdout, "\n");
619 report_complete(stdout, " ");
623 * Read the message headers and ship them to the
626 err = readheaders(mailserver_socket, len, msgsize,
628 /* pass the suppress_readbody flag only if the underlying
629 * protocol does not fetch the body separately */
630 separatefetchbody ? 0 : &suppress_readbody);
631 if (err == PS_RETAINED)
632 suppress_forward = suppress_delete = retained = TRUE;
633 else if (err == PS_TRANSIENT)
634 suppress_delete = suppress_forward = TRUE;
635 else if (err == PS_REFUSED)
636 suppress_forward = TRUE;
637 else if (err == PS_TRUNCATED)
638 suppress_readbody = TRUE;
642 /* tell server we got it OK and resynchronize */
643 if (separatefetchbody && ctl->server.base_protocol->trail)
645 if (outlevel >= O_VERBOSE && !is_a_file(1) && !run.use_syslog)
651 if ((err = (ctl->server.base_protocol->trail)(mailserver_socket, ctl, tag)))
655 /* do not read the body which is not being forwarded only if
656 * the underlying protocol allows the body to be fetched
658 if (separatefetchbody && suppress_forward)
659 suppress_readbody = TRUE;
662 * If we're using IMAP4 or something else that
663 * can fetch headers separately from bodies,
664 * it's time to request the body now. This
665 * fetch may be skipped if we got an anti-spam
666 * or other PS_REFUSED error response during
669 if (!suppress_readbody)
671 if (separatefetchbody)
674 if ((err=(ctl->server.base_protocol->fetch_body)(mailserver_socket,ctl,num,&len)))
677 * Work around a bug in Novell's
678 * broken GroupWise IMAP server;
679 * its body FETCH response is missing
680 * the required length for the data
681 * string. This violates RFC2060.
684 len = msgsize - msgblk.msglen;
685 if (outlevel > O_SILENT && !wholesize)
686 report_complete(stdout,
687 GT_(" (%d body octets) "), len);
690 /* process the body now */
691 err = readbody(mailserver_socket,
695 if (err == PS_TRANSIENT)
696 suppress_delete = suppress_forward = TRUE;
700 /* tell server we got it OK and resynchronize */
701 if (ctl->server.base_protocol->trail)
703 if (outlevel >= O_VERBOSE && !is_a_file(1) && !run.use_syslog)
709 err = (ctl->server.base_protocol->trail)(mailserver_socket, ctl, tag);
715 /* count # messages forwarded on this pass */
716 if (!suppress_forward)
720 * Check to see if the numbers matched?
722 * Yes, some servers foo this up horribly.
723 * All IMAP servers seem to get it right, and
724 * so does Eudora QPOP at least in 2.xx
727 * Microsoft Exchange gets it completely
728 * wrong, reporting compressed rather than
729 * actual sizes (so the actual length of
730 * message is longer than the reported size).
731 * Another fine example of Microsoft brain death!
733 * Some older POP servers, like the old UCB
734 * POP server and the pre-QPOP QUALCOMM
735 * versions, report a longer size in the LIST
736 * response than actually gets shipped up.
737 * It's unclear what is going on here, as the
738 * QUALCOMM server (at least) seems to be
739 * reporting the on-disk size correctly.
741 if (msgblk.msglen != msgsize)
743 if (outlevel >= O_DEBUG)
745 GT_("message %s@%s:%d was not the expected length (%d actual != %d expected)\n"),
746 ctl->remotename, ctl->server.truename, num,
747 msgblk.msglen, msgsize);
750 /* end-of-message processing starts here */
751 if (!close_sink(ctl, &msgblk, !suppress_forward))
754 suppress_delete = TRUE;
762 * At this point in flow of control, either
763 * we've bombed on a protocol error or had
764 * delivery refused by the SMTP server
765 * (unlikely -- I've never seen it) or we've
766 * seen `accepted for delivery' and the
767 * message is shipped. It's safe to mark the
768 * message seen and delete it on the server
772 /* maybe we delete this message now? */
775 if (outlevel > O_SILENT)
776 report(stdout, GT_(" retained\n"));
778 else if (ctl->server.base_protocol->delete_msg
780 && ((msgcode >= 0 && !ctl->keep)
781 || (msgcode == MSGLEN_OLD && ctl->flush)
782 || (msgcode == MSGLEN_TOOLARGE && ctl->limitflush)))
785 if (outlevel > O_SILENT)
786 report_complete(stdout, GT_(" flushed\n"));
787 err = (ctl->server.base_protocol->delete_msg)(mailserver_socket, ctl, num);
793 if ( (outlevel >= O_VERBOSE) ||
794 /* To avoid flooding the syslog when using --keep,
795 * report "Skipped message" only when:
796 * 1) --verbose is on, or
797 * 2) fetchmail does not use syslog, or
798 * 3) the message was skipped for some other
799 * reason than just being old.
801 (outlevel > O_SILENT && (!run.use_syslog || msgcode != MSGLEN_OLD))
803 report_complete(stdout, GT_(" not flushed\n"));
805 /* maybe we mark this message as seen now? */
806 if (ctl->server.base_protocol->mark_seen
808 && (msgcode >= 0 && ctl->keep))
810 err = (ctl->server.base_protocol->mark_seen)(mailserver_socket, ctl, num);
816 /* perhaps this as many as we're ready to handle */
817 if (maxfetch && maxfetch <= *fetches && num < count)
819 int remcount = count - (*fetches - initialfetches);
821 ngettext("fetchlimit %d reached; %d message left on server %s account %s\n",
822 "fetchlimit %d reached; %d messages left on server %s account %s\n", remcount),
823 maxfetch, remcount, ctl->server.truename, ctl->remotename);
826 } /* for (num = 1; num <= count; num++) */
831 /* retrieve messages from server using given protocol method table */
832 static int do_session(
833 /* parsed options with merged-in defaults */
835 /* protocol method table */
836 const struct method *proto,
837 /* maximum number of messages to fetch */
840 static int *msgsizes;
841 volatile int err, mailserver_socket = -1; /* pacifies -Wall */
843 int deletions = 0, js;
845 SIGHANDLERTYPE pipesave;
846 SIGHANDLERTYPE alrmsave;
848 ctl->server.base_protocol = proto;
853 init_transact(proto);
855 /* set up the server-nonresponse timeout */
856 alrmsave = set_signal_handler(SIGALRM, timeout_handler);
857 mytimeout = ctl->server.timeout;
859 /* set up the broken-pipe timeout */
860 pipesave = set_signal_handler(SIGPIPE, sigpipe_handler);
862 if ((js = setjmp(restart)))
864 /* exception caught */
865 #ifdef HAVE_SIGPROCMASK
867 * Don't rely on setjmp() to restore the blocked-signal mask.
868 * It does this under BSD but is required not to under POSIX.
870 * If your Unix doesn't have sigprocmask, better hope it has
871 * BSD-like behavior. Otherwise you may see fetchmail get
872 * permanently wedged after a second timeout on a bad read,
873 * because alarm signals were blocked after the first.
877 sigfillset(&allsigs);
878 sigprocmask(SIG_UNBLOCK, &allsigs, NULL);
879 #endif /* HAVE_SIGPROCMASK */
881 if (js == THROW_SIGPIPE)
883 set_signal_handler(SIGPIPE, SIG_IGN);
885 GT_("SIGPIPE thrown from an MDA or a stream socket error\n"));
888 else if (js == THROW_TIMEOUT)
890 if (phase == OPEN_WAIT)
892 GT_("timeout after %d seconds waiting to connect to server %s.\n"),
893 ctl->server.timeout, ctl->server.pollname);
894 else if (phase == SERVER_WAIT)
896 GT_("timeout after %d seconds waiting for server %s.\n"),
897 ctl->server.timeout, ctl->server.pollname);
898 else if (phase == FORWARDING_WAIT)
900 GT_("timeout after %d seconds waiting for %s.\n"),
902 ctl->mda ? "MDA" : "SMTP");
903 else if (phase == LISTENER_WAIT)
905 GT_("timeout after %d seconds waiting for listener to respond.\n"), ctl->server.timeout);
908 GT_("timeout after %d seconds.\n"), ctl->server.timeout);
911 * If we've exceeded our threshold for consecutive timeouts,
912 * try to notify the user, then mark the connection wedged.
913 * Don't do this if the connection can idle, though; idle
914 * timeouts just mean the frequency of mail is low.
916 if (timeoutcount > MAX_TIMEOUTS
917 && !open_warning_by_mail(ctl))
919 stuff_warning(iana_charset, ctl,
920 GT_("Subject: fetchmail sees repeated timeouts"));
921 stuff_warning(NULL, ctl, "%s", "");
922 stuff_warning(NULL, ctl,
923 GT_("Fetchmail saw more than %d timeouts while attempting to get mail from %s@%s.\n"),
925 ctl->remotename, ctl->server.truename);
926 stuff_warning(NULL, ctl,
927 GT_("This could mean that your mailserver is stuck, or that your SMTP\n" \
928 "server is wedged, or that your mailbox file on the server has been\n" \
929 "corrupted by a server error. You can run `fetchmail -v -v' to\n" \
930 "diagnose the problem.\n\n" \
931 "Fetchmail won't poll this mailbox again until you restart it.\n"));
932 close_warning_by_mail(ctl, (struct msgblk *)NULL);
942 /* setjmp returned zero -> normal operation */
943 char buf[MSGBUFSIZE+1], *realhost;
944 int count, newm, bytes;
945 int fetches, dispatches, oldphase;
948 /* execute pre-initialization command, if any */
949 if (ctl->preconnect && (err = system(ctl->preconnect)))
952 GT_("pre-connection command failed with status %d\n"), err);
957 /* open a socket to the mail server */
960 set_timeout(mytimeout);
962 #ifdef HAVE_PKG_hesiod
963 /* If either the pollname or vianame are "hesiod" we want to
964 lookup the user's hesiod pobox host */
965 if (!strcasecmp(ctl->server.queryname, "hesiod")) {
966 struct hes_postoffice *hes_p;
967 hes_p = hes_getmailhost(ctl->remotename);
968 if (hes_p != NULL && strcmp(hes_p->po_type, "POP") == 0) {
969 free(ctl->server.queryname);
970 ctl->server.queryname = xstrdup(hes_p->po_host);
972 free(ctl->server.via);
973 ctl->server.via = xstrdup(hes_p->po_host);
976 GT_("couldn't find HESIOD pobox for %s\n"),
983 * Canonicalize the server truename for later use. This also
984 * functions as a probe for whether the mailserver is accessible.
985 * We try it on each poll cycle until we get a result. This way,
986 * fetchmail won't fail if started up when the network is inaccessible.
988 if (ctl->server.dns && !ctl->server.trueaddr)
990 if (ctl->server.lead_server)
992 char *leadname = ctl->server.lead_server->truename;
994 /* prevent core dump from ill-formed or duplicate entry */
997 report(stderr, GT_("Lead server has no name.\n"));
1004 xfree(ctl->server.truename);
1005 ctl->server.truename = xstrdup(leadname);
1009 struct addrinfo hints, *res;
1012 memset(&hints, 0, sizeof(hints));
1013 hints.ai_socktype = SOCK_STREAM;
1014 hints.ai_family = AF_UNSPEC;
1015 hints.ai_flags = AI_CANONNAME;
1017 error = getaddrinfo(ctl->server.queryname, NULL, &hints, &res);
1021 GT_("couldn't find canonical DNS name of %s (%s)\n"),
1022 ctl->server.pollname, ctl->server.queryname);
1030 xfree(ctl->server.truename);
1031 ctl->server.truename = xstrdup(res->ai_canonname);
1032 ctl->server.trueaddr = xmalloc(res->ai_addrlen);
1033 ctl->server.trueaddr_len = res->ai_addrlen;
1034 memcpy(ctl->server.trueaddr, res->ai_addr, res->ai_addrlen);
1040 realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname;
1042 /* allow time for the port to be set up if we have a plugin */
1043 if (ctl->server.plugin)
1045 if ((mailserver_socket = SockOpen(realhost,
1046 ctl->server.service ? ctl->server.service : ( ctl->use_ssl ? ctl->server.base_protocol->sslservice : ctl->server.base_protocol->service ),
1047 ctl->server.plugin)) == -1)
1049 char errbuf[BUFSIZ];
1052 * Avoid generating a bogus error every poll cycle when we're
1053 * in daemon mode but the connection to the outside world
1056 if (!((err_no == EHOSTUNREACH || err_no == ENETUNREACH)
1057 && run.poll_interval))
1059 report_build(stderr, GT_("%s connection to %s failed"),
1060 ctl->server.base_protocol->name, ctl->server.pollname);
1061 strlcpy(errbuf, strerror(err_no), sizeof(errbuf));
1062 report_complete(stderr, ": %s\n", errbuf);
1066 * Don't use this. It was an attempt to address Debian bug
1067 * #47143 (Notify user by mail when pop server nonexistent).
1068 * Trouble is, that doesn't work; you trip over the case
1069 * where your SLIP or PPP link is down...
1071 /* warn the system administrator */
1072 if (open_warning_by_mail(ctl) == 0)
1074 stuff_warning(iana_charset, ctl,
1075 GT_("Subject: Fetchmail unreachable-server warning."));
1076 stuff_warning(NULL, ctl, "");
1077 stuff_warning(NULL, ctl, GT_("Fetchmail could not reach the mail server %s:"),
1078 ctl->server.pollname);
1079 stuff_warning(NULL, ctl, errbuf, ctl->server.pollname);
1080 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1091 /* Save the socket opened. Useful if Fetchmail hangs on SSLOpen
1092 * because the socket can be closed.
1094 mailserver_socket_temp = mailserver_socket;
1095 set_timeout(mytimeout);
1097 /* perform initial SSL handshake on open connection */
1098 /* Note: We pass the realhost name over for certificate
1099 verification. We may want to make this configurable */
1100 if (ctl->use_ssl && SSLOpen(mailserver_socket,ctl->sslcert,ctl->sslkey,ctl->sslproto,ctl->sslcertck,
1101 ctl->sslcertpath,ctl->sslfingerprint,realhost,ctl->server.pollname) == -1)
1103 report(stderr, GT_("SSL connection failed.\n"));
1108 /* Fetchmail didn't hang on SSLOpen,
1109 * then no need to set mailserver_socket_temp
1111 mailserver_socket_temp = -1;
1114 /* A timeout is still defined before SSLOpen,
1115 * then Fetchmail hanging on SSLOpen is handled.
1120 if (ctl->server.authenticate == A_KERBEROS_V4 && (strcasecmp(proto->name,"IMAP") != 0))
1122 set_timeout(mytimeout);
1123 err = kerberos_auth(mailserver_socket, ctl->server.truename,
1124 ctl->server.principal);
1129 #endif /* KERBEROS_V4 */
1132 if (ctl->server.authenticate == A_KERBEROS_V5)
1134 set_timeout(mytimeout);
1135 err = kerberos5_auth(mailserver_socket, ctl->server.truename);
1140 #endif /* KERBEROS_V5 */
1142 /* accept greeting message from mail server */
1143 err = (ctl->server.base_protocol->parse_response)(mailserver_socket, buf);
1147 /* try to get authorized to fetch mail */
1148 stage = STAGE_GETAUTH;
1149 if (ctl->server.base_protocol->getauth)
1151 err = (ctl->server.base_protocol->getauth)(mailserver_socket, ctl, buf);
1155 if (err == PS_LOCKBUSY)
1156 report(stderr, GT_("Lock-busy error on %s@%s\n"),
1158 ctl->server.truename);
1159 else if (err == PS_SERVBUSY)
1160 report(stderr, GT_("Server busy error on %s@%s\n"),
1162 ctl->server.truename);
1163 else if (err == PS_AUTHFAIL)
1165 report(stderr, GT_("Authorization failure on %s@%s%s\n"),
1167 ctl->server.truename,
1168 (ctl->wehaveauthed ? GT_(" (previously authorized)") : "")
1172 * If we're running in background, try to mail the
1173 * calling user a heads-up about the authentication
1174 * failure once it looks like this isn't a fluke
1175 * due to the server being temporarily inaccessible.
1176 * When we get third succesive failure, we notify the user
1177 * but only if we haven't already managed to get
1178 * authorization. After that, once we get authorization
1179 * we let the user know service is restored.
1181 if (run.poll_interval
1182 && !ctl->wehavesentauthnote
1183 && ((ctl->wehaveauthed && ++ctl->authfailcount >= 10)
1184 || (!ctl->wehaveauthed && ++ctl->authfailcount >= 3))
1185 && !open_warning_by_mail(ctl))
1187 ctl->wehavesentauthnote = 1;
1188 stuff_warning(iana_charset, ctl,
1189 GT_("Subject: fetchmail authentication failed on %s@%s"),
1190 ctl->remotename, ctl->server.truename);
1191 stuff_warning(NULL, ctl, "%s", "");
1192 stuff_warning(NULL, ctl,
1193 GT_("Fetchmail could not get mail from %s@%s.\n"),
1195 ctl->server.truename);
1196 if (ctl->wehaveauthed) {
1197 stuff_warning(NULL, ctl, GT_("\
1198 The attempt to get authorization failed.\n\
1199 Since we have already succeeded in getting authorization for this\n\
1200 connection, this is probably another failure mode (such as busy server)\n\
1201 that fetchmail cannot distinguish because the server didn't send a useful\n\
1203 stuff_warning(NULL, ctl, GT_("\
1205 However, if you HAVE changed your account details since starting the\n\
1206 fetchmail daemon, you need to stop the daemon, change your configuration\n\
1207 of fetchmail, and then restart the daemon.\n\
1209 The fetchmail daemon will continue running and attempt to connect\n\
1210 at each cycle. No future notifications will be sent until service\n\
1213 stuff_warning(NULL, ctl, GT_("\
1214 The attempt to get authorization failed.\n\
1215 This probably means your password is invalid, but some servers have\n\
1216 other failure modes that fetchmail cannot distinguish from this\n\
1217 because they don't send useful error messages on login failure.\n\
1219 The fetchmail daemon will continue running and attempt to connect\n\
1220 at each cycle. No future notifications will be sent until service\n\
1223 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1226 else if (err == PS_REPOLL)
1228 if (outlevel >= O_VERBOSE)
1229 report(stderr, GT_("Repoll immediately on %s@%s\n"),
1231 ctl->server.truename);
1234 report(stderr, GT_("Unknown login or authentication error on %s@%s\n"),
1236 ctl->server.truename);
1243 * This connection has given us authorization at least once.
1245 * There are dodgy server (clubinternet.fr for example) that
1246 * give spurious authorization failures on patently good
1247 * account/password details, then 5 minutes later let you in!
1249 * This is meant to build in some tolerance of such nasty bits
1252 ctl->wehaveauthed = 1;
1253 /*if (ctl->authfailcount >= 3)*/
1254 if (ctl->wehavesentauthnote)
1256 ctl->wehavesentauthnote = 0;
1258 GT_("Authorization OK on %s@%s\n"),
1260 ctl->server.truename);
1261 if (!open_warning_by_mail(ctl))
1263 stuff_warning(iana_charset, ctl,
1264 GT_("Subject: fetchmail authentication OK on %s@%s"),
1265 ctl->remotename, ctl->server.truename);
1266 stuff_warning(NULL, ctl, "%s", "");
1267 stuff_warning(NULL, ctl,
1268 GT_("Fetchmail was able to log into %s@%s.\n"),
1270 ctl->server.truename);
1271 stuff_warning(NULL, ctl,
1272 GT_("Service has been restored.\n"));
1273 close_warning_by_mail(ctl, (struct msgblk *)NULL);
1278 * Reporting only after the first three
1279 * consecutive failures, or ten consecutive
1280 * failures after we have managed to get
1283 ctl->authfailcount = 0;
1287 ctl->errcount = fetches = 0;
1289 /* now iterate over each folder selected */
1290 for (idp = ctl->mailboxes; idp; idp = idp->next)
1297 /* reset timeout, in case we did an IDLE */
1298 mytimeout = ctl->server.timeout;
1300 if (outlevel >= O_DEBUG)
1303 report(stdout, GT_("selecting or re-polling folder %s\n"), idp->id);
1305 report(stdout, GT_("selecting or re-polling default folder\n"));
1308 /* compute # of messages and number of new messages waiting */
1309 stage = STAGE_GETRANGE;
1310 err = (ctl->server.base_protocol->getrange)(mailserver_socket, ctl, idp->id, &count, &newm, &bytes);
1313 /* show user how many messages we downloaded */
1315 (void) snprintf(buf, sizeof(buf),
1316 GT_("%s at %s (folder %s)"),
1317 ctl->remotename, ctl->server.pollname, idp->id);
1319 (void) snprintf(buf, sizeof(buf), GT_("%s at %s"),
1320 ctl->remotename, ctl->server.pollname);
1321 if (outlevel > O_SILENT)
1323 if (count == -1) /* only used for ETRN */
1324 report(stdout, GT_("Polling %s\n"), ctl->server.truename);
1325 else if (count != 0)
1327 if (newm != -1 && (count - newm) > 0)
1328 report_build(stdout, ngettext("%d message (%d %s) for %s", "%d messages (%d %s) for %s", (unsigned long)count),
1331 ngettext("seen", "seen", (unsigned long)count-newm),
1334 report_build(stdout, ngettext("%d message for %s",
1335 "%d messages for %s",
1339 report_complete(stdout, ".\n");
1341 report_complete(stdout, GT_(" (%d octets).\n"), bytes);
1345 /* these are pointless in normal daemon mode */
1346 if (pass == 1 && (run.poll_interval == 0 || outlevel >= O_VERBOSE))
1347 report(stdout, GT_("No mail for %s\n"), buf);
1351 /* very important, this is where we leave the do loop */
1357 if (newm == -1 || ctl->fetchall)
1359 fetches = newm; /* set error status correctly */
1361 * There used to be a `goto noerror' here, but this
1362 * prevented checking of multiple folders. This
1363 * comment is a reminder in case I introduced some
1364 * subtle bug by removing it...
1372 * Don't trust the message count passed by the server.
1373 * Without this check, it might be possible to do a
1374 * DNS-spoofing attack that would pass back a ridiculous
1375 * count, and allocate a malloc area that would overlap
1376 * a portion of the stack.
1378 if ((unsigned)count > INT_MAX/sizeof(int))
1380 report(stderr, GT_("bogus message count!"));
1386 * We need the size of each message before it's
1387 * loaded in order to pass it to the ESMTP SIZE
1388 * option. If the protocol has a getsizes method,
1389 * we presume this means it doesn't get reliable
1390 * sizes from message fetch responses.
1392 * If the protocol supports getting sizes of subset of
1393 * messages, we skip this step now.
1395 if (proto->getsizes &&
1396 !(proto->getpartialsizes && NUM_NONZERO(ctl->fetchsizelimit)))
1399 msgsizes = xmalloc(sizeof(int) * count);
1400 for (i = 0; i < count; i++)
1403 stage = STAGE_GETSIZES;
1404 err = (proto->getsizes)(mailserver_socket, count, msgsizes);
1411 for (i = 0; i < count; i++)
1412 bytes += msgsizes[i];
1416 /* read, forward, and delete messages */
1417 stage = STAGE_FETCH;
1419 /* fetch in lockstep mode */
1420 err = fetch_messages(mailserver_socket, ctl,
1423 &fetches, &dispatches, &deletions);
1424 if (err != PS_SUCCESS && err != PS_MAXFETCH)
1427 if (!check_only && ctl->skipped
1428 && run.poll_interval > 0 && !nodetach)
1430 clean_skipped_list(&ctl->skipped);
1431 send_size_warnings(ctl);
1435 /* end-of-mailbox processing before we repoll or switch to another one */
1436 if (ctl->server.base_protocol->end_mailbox_poll)
1438 err = (ctl->server.base_protocol->end_mailbox_poll)(mailserver_socket, ctl);
1442 /* Return now if we have reached the fetchlimit */
1443 if (maxfetch && maxfetch <= fetches)
1447 * Only re-poll if we either had some actual forwards and
1448 * either allowed deletions and had no errors.
1449 * Otherwise it is far too easy to get into infinite loops.
1451 (dispatches && ctl->server.base_protocol->retry && !ctl->keep && !ctl->errcount);
1454 /* XXX: From this point onwards, preserve err unless a new error has occurred */
1457 /* PS_SUCCESS, PS_MAXFETCH: ordinary termination with no errors -- officially log out */
1458 stage = STAGE_LOGOUT;
1459 tmperr = (ctl->server.base_protocol->logout_cmd)(mailserver_socket, ctl);
1460 if (tmperr != PS_SUCCESS)
1463 * Hmmmm...arguably this would be incorrect if we had fetches but
1464 * no dispatches (due to oversized messages, etc.)
1466 else if (err == PS_SUCCESS && fetches == 0)
1469 * Close all SMTP delivery sockets. For optimum performance
1470 * we'd like to hold them open til end of run, but (1) this
1471 * loses if our poll interval is longer than the MTA's
1472 * inactivity timeout, and (2) some MTAs (like smail) don't
1473 * deliver after each message, but rather queue up mail and
1474 * wait to actually deliver it until the input socket is
1477 * don't send QUIT for ODMR case because we're acting as a
1478 * proxy between the SMTP server and client.
1480 smtp_close(ctl, ctl->server.protocol != P_ODMR);
1481 cleanupSockClose(mailserver_socket);
1485 /* we only get here on error */
1486 if (err != 0 && err != PS_SOCKET && err != PS_REPOLL)
1488 stage = STAGE_LOGOUT;
1489 (ctl->server.base_protocol->logout_cmd)(mailserver_socket, ctl);
1492 /* try to clean up all streams */
1495 * Sending SMTP QUIT on signal is theoretically nice, but led
1496 * to a subtle bug. If fetchmail was terminated by signal
1497 * while it was shipping message text, it would hang forever
1498 * waiting for a command acknowledge. In theory we could
1499 * enable the QUIT only outside of the message send. In
1500 * practice, we don't care. All mailservers hang up on a
1501 * dropped TCP/IP connection anyway.
1504 if (mailserver_socket != -1) {
1505 cleanupSockClose(mailserver_socket);
1506 mailserver_socket = -1;
1508 /* If there was a connect timeout, the socket should be closed.
1509 * mailserver_socket_temp contains the socket to close.
1511 if (mailserver_socket_temp != -1) {
1512 cleanupSockClose(mailserver_socket_temp);
1513 mailserver_socket_temp = -1;
1517 /* no report on PS_AUTHFAIL */
1522 msg = GT_("socket");
1525 msg = GT_("missing or bad RFC822 header");
1531 msg = GT_("client/server synchronization");
1534 msg = GT_("client/server protocol");
1537 msg = GT_("lock busy on server");
1540 msg = GT_("SMTP transaction");
1543 msg = GT_("DNS lookup");
1546 msg = GT_("undefined");
1550 if (phase == FORWARDING_WAIT || phase == LISTENER_WAIT
1552 report(stderr, GT_("%s error while fetching from %s@%s and delivering to SMTP host %s\n"),
1553 msg, ctl->remotename, ctl->server.pollname,
1554 ctl->smtphost ? ctl->smtphost : GT_("unknown"));
1556 report(stderr, GT_("%s error while fetching from %s@%s\n"),
1557 msg, ctl->remotename, ctl->server.pollname);
1563 /* execute wrapup command, if any */
1564 if (ctl->postconnect && (tmperr = system(ctl->postconnect)))
1566 report(stderr, GT_("post-connection command failed with status %d\n"), tmperr);
1567 if (err == PS_SUCCESS)
1571 set_timeout(0); /* cancel any pending alarm */
1572 set_signal_handler(SIGALRM, alrmsave);
1573 set_signal_handler(SIGPIPE, pipesave);
1577 int do_protocol(ctl, proto)
1578 /* retrieve messages from server using given protocol method table */
1579 struct query *ctl; /* parsed options with merged-in defaults */
1580 const struct method *proto; /* protocol method table */
1585 if (ctl->server.authenticate == A_KERBEROS_V4)
1587 report(stderr, GT_("Kerberos V4 support not linked.\n"));
1590 #endif /* KERBEROS_V4 */
1593 if (ctl->server.authenticate == A_KERBEROS_V5)
1595 report(stderr, GT_("Kerberos V5 support not linked.\n"));
1598 #endif /* KERBEROS_V5 */
1600 /* lacking methods, there are some options that may fail */
1603 /* check for unsupported options */
1606 GT_("Option --flush is not supported with %s\n"),
1610 else if (ctl->fetchall) {
1612 GT_("Option --all is not supported with %s\n"),
1617 if (!(proto->getsizes || proto->getpartialsizes)
1618 && NUM_SPECIFIED(ctl->limit))
1621 GT_("Option --limit is not supported with %s\n"),
1627 * If no expunge limit or we do expunges within the driver,
1628 * then just do one session, passing in any fetchlimit.
1630 if ((ctl->keep && !ctl->flush) ||
1631 proto->retry || !NUM_SPECIFIED(ctl->expunge))
1632 return(do_session(ctl, proto, NUM_VALUE_OUT(ctl->fetchlimit)));
1634 * There's an expunge limit, and it isn't handled in the driver itself.
1635 * OK; do multiple sessions, each fetching a limited # of messages.
1636 * Stop if the total count of retrieved messages exceeds ctl->fetchlimit
1637 * (if it was nonzero).
1643 int expunge = NUM_VALUE_OUT(ctl->expunge);
1644 int fetchlimit = NUM_VALUE_OUT(ctl->fetchlimit);
1647 if (fetchlimit > 0 && (expunge == 0 || expunge > fetchlimit - totalcount))
1648 expunge = fetchlimit - totalcount;
1649 err = do_session(ctl, proto, expunge);
1650 totalcount += expunge;
1651 if (NUM_SPECIFIED(ctl->fetchlimit) && totalcount >= fetchlimit)
1653 if (err != PS_LOCKBUSY)
1655 else if (lockouts >= MAX_LOCKOUTS)
1657 else /* err == PS_LOCKBUSY */
1660 * Allow time for the server lock to release. if we
1661 * don't do this, we'll often hit a locked-mailbox
1662 * condition and fail.
1668 (err == PS_MAXFETCH || err == PS_LOCKBUSY);
1675 /* driver.c ends here */