2 * imap.c -- IMAP2bis/IMAP4 protocol methods
4 * Copyright 1997 by Eric S. Raymond
5 * For license terms, see the file COPYING in this directory.
12 #if defined(STDC_HEADERS)
17 #include "fetchmail.h"
22 /* imap_version values */
23 #define IMAP2 -1 /* IMAP2 or IMAP2BIS, RFC1176 */
24 #define IMAP4 0 /* IMAP4 rev 0, RFC1730 */
25 #define IMAP4rev1 1 /* IMAP4 rev 1, RFC2060 */
27 /* global variables: please reinitialize them explicitly for proper
28 * working in daemon mode */
30 /* TODO: session variables to be initialized before server greeting */
31 static int preauth = FALSE;
33 /* session variables initialized in capa_probe() or imap_getauth() */
34 static char capabilities[MSGBUFSIZE+1];
35 static int imap_version = IMAP4;
36 static flag do_idle = FALSE, has_idle = FALSE;
37 static int expunge_period = 1;
39 /* mailbox variables initialized in imap_getrange() */
40 static int count = 0, recentcount = 0, unseen = 0, deletions = 0;
41 static unsigned int startcount = 1;
42 static int expunged = 0;
43 static unsigned int *unseen_messages;
45 /* for "IMAP> EXPUNGE" */
46 static int actual_deletions = 0;
48 /* for "IMAP> IDLE" */
49 static int saved_timeout = 0;
51 static int imap_ok(int sock, char *argbuf)
52 /* parse command response */
54 char buf[MSGBUFSIZE+1];
60 if ((ok = gen_recv(sock, buf, sizeof(buf))))
63 /* all tokens in responses are caseblind */
64 for (cp = buf; *cp; cp++)
65 if (islower((unsigned char)*cp))
66 *cp = toupper((unsigned char)*cp);
68 /* interpret untagged status responses
69 * First check if we really have an untagged response, starting
70 * with "*" SPACE. Then, for each individual check, use a BLANK
71 * before the word to avoid confusion with the \Recent flag or
73 if (buf[0] == '*' && buf[1] == ' ') {
74 if (strstr(buf, " CAPABILITY")) {
75 strlcpy(capabilities, buf + 12, sizeof(capabilities));
77 else if (strstr(buf, " EXISTS"))
81 * Don't trust the message count passed by the server.
82 * Without this check, it might be possible to do a
83 * DNS-spoofing attack that would pass back a ridiculous
84 * count, and allocate a malloc area that would overlap
85 * a portion of the stack.
87 if (count > INT_MAX/sizeof(int))
89 report(stderr, GT_("bogus message count!"));
94 * Nasty kluge to handle RFC2177 IDLE. If we know we're idling
95 * we can't wait for the tag matching the IDLE; we have to tell the
96 * server the IDLE is finished by shipping back a DONE when we
97 * see an EXISTS. Only after that will a tagged response be
98 * shipped. The idling flag also gets cleared on a timeout.
100 if (stage == STAGE_IDLE)
102 /* If IDLE isn't supported, we were only sending NOOPs anyway. */
105 /* we do our own write and report here to disable tagging */
106 SockWrite(sock, "DONE\r\n", 6);
107 if (outlevel >= O_MONITOR)
108 report(stdout, "IMAP> DONE\n");
111 mytimeout = saved_timeout;
115 else if (strstr(buf, " RECENT"))
117 recentcount = atoi(buf+2);
119 else if (strstr(buf, " EXPUNGE"))
121 /* the response "* 10 EXPUNGE" means that the currently
122 * tenth (i.e. only one) message has been deleted */
127 /* Some servers do not report RECENT after an EXPUNGE.
128 * For such servers, assume that the mail being
129 * expunged is a recent one. For other servers, we
130 * should get an updated RECENT report later and this
131 * assumption will have no effect. */
137 else if (strstr(buf, " PREAUTH"))
142 * The server may decide to make the mailbox read-only,
143 * which causes fetchmail to go into a endless loop
144 * fetching the same message over and over again.
146 * However, for check_only, we use EXAMINE which will
147 * mark the mailbox read-only as per the RFC.
149 * This checks for the condition and aborts if
150 * the mailbox is read-only.
152 * See RFC 2060 section 6.3.1 (SELECT).
153 * See RFC 2060 section 6.3.2 (EXAMINE).
155 else if (!check_only && strstr(buf, "[READ-ONLY]"))
161 (tag[0] != '\0' && strncmp(buf, tag, strlen(tag)));
174 for (cp = buf; !isspace((unsigned char)*cp); cp++)
176 while (isspace((unsigned char)*cp))
179 if (strncasecmp(cp, "OK", 2) == 0)
185 else if (strncasecmp(cp, "BAD", 3) == 0)
187 else if (strncasecmp(cp, "NO", 2) == 0)
189 if (stage == STAGE_GETAUTH)
190 return(PS_AUTHFAIL); /* RFC2060, 6.2.2 */
203 * NTLM support by Grant Edwards.
205 * Handle MS-Exchange NTLM authentication method. This is the same
206 * as the NTLM auth used by Samba for SMB related services. We just
207 * encode the packets in base64 instead of sending them out via a
210 * Much source (ntlm.h, smb*.c smb*.h) was borrowed from Samba.
213 static int do_imap_ntlm(int sock, struct query *ctl)
215 tSmbNtlmAuthRequest request;
216 tSmbNtlmAuthChallenge challenge;
217 tSmbNtlmAuthResponse response;
222 gen_send(sock, "AUTHENTICATE NTLM");
224 if ((result = gen_recv(sock, msgbuf, sizeof msgbuf)))
227 if (msgbuf[0] != '+')
230 buildSmbNtlmAuthRequest(&request,ctl->remotename,NULL);
232 if (outlevel >= O_DEBUG)
233 dumpSmbNtlmAuthRequest(stdout, &request);
235 memset(msgbuf,0,sizeof msgbuf);
236 to64frombits (msgbuf, &request, SmbLength(&request));
238 if (outlevel >= O_MONITOR)
239 report(stdout, "IMAP> %s\n", msgbuf);
241 strcat(msgbuf,"\r\n");
242 SockWrite (sock, msgbuf, strlen (msgbuf));
244 if ((gen_recv(sock, msgbuf, sizeof msgbuf)))
247 len = from64tobits (&challenge, msgbuf, sizeof(challenge));
249 if (outlevel >= O_DEBUG)
250 dumpSmbNtlmAuthChallenge(stdout, &challenge);
252 buildSmbNtlmAuthResponse(&challenge, &response,ctl->remotename,ctl->password);
254 if (outlevel >= O_DEBUG)
255 dumpSmbNtlmAuthResponse(stdout, &response);
257 memset(msgbuf,0,sizeof msgbuf);
258 to64frombits (msgbuf, &response, SmbLength(&response));
260 if (outlevel >= O_MONITOR)
261 report(stdout, "IMAP> %s\n", msgbuf);
263 strcat(msgbuf,"\r\n");
264 SockWrite (sock, msgbuf, strlen (msgbuf));
266 if ((result = gen_recv (sock, msgbuf, sizeof msgbuf)))
269 if (strstr (msgbuf, "OK"))
276 static void imap_canonicalize(char *result, char *raw, size_t maxlen)
277 /* encode an IMAP password as per RFC1730's quoting conventions */
282 for (i = 0; i < strlen(raw) && i < maxlen; i++)
284 if ((raw[i] == '\\') || (raw[i] == '"'))
286 result[j++] = raw[i];
291 static void capa_probe(int sock, struct query *ctl)
292 /* set capability variables from a CAPA probe */
296 /* probe to see if we're running IMAP4 and can use RFC822.PEEK */
297 capabilities[0] = '\0';
298 if ((ok = gen_transact(sock, "CAPABILITY")) == PS_SUCCESS)
302 /* capability checks are supposed to be caseblind */
303 for (cp = capabilities; *cp; cp++)
304 *cp = toupper((unsigned char)*cp);
306 /* UW-IMAP server 10.173 notifies in all caps, but RFC2060 says we
307 should expect a response in mixed-case */
308 if (strstr(capabilities, "IMAP4REV1"))
310 imap_version = IMAP4rev1;
311 if (outlevel >= O_DEBUG)
312 report(stdout, GT_("Protocol identified as IMAP4 rev 1\n"));
316 imap_version = IMAP4;
317 if (outlevel >= O_DEBUG)
318 report(stdout, GT_("Protocol identified as IMAP4 rev 0\n"));
321 else if (ok == PS_ERROR)
323 imap_version = IMAP2;
324 if (outlevel >= O_DEBUG)
325 report(stdout, GT_("Protocol identified as IMAP2 or IMAP2BIS\n"));
329 * Handle idling. We depend on coming through here on startup
330 * and after each timeout (including timeouts during idles).
335 if (strstr(capabilities, "IDLE"))
339 if (outlevel >= O_VERBOSE)
340 report(stdout, GT_("will idle after poll\n"));
343 peek_capable = (imap_version >= IMAP4);
346 static int imap_getauth(int sock, struct query *ctl, char *greeting)
347 /* apply for connection authorization */
351 flag did_stls = FALSE;
352 #endif /* SSL_ENABLE */
355 * Assumption: expunges are cheap, so we want to do them
356 * after every message unless user said otherwise.
358 if (NUM_SPECIFIED(ctl->expunge))
359 expunge_period = NUM_VALUE_OUT(ctl->expunge);
363 capa_probe(sock, ctl);
366 * If either (a) we saw a PREAUTH token in the greeting, or
367 * (b) the user specified ssh preauthentication, then we're done.
369 if (preauth || ctl->server.authenticate == A_SSH)
371 preauth = FALSE; /* reset for the next session */
376 if ((!ctl->sslproto || !strcmp(ctl->sslproto,"tls1"))
378 && strstr(capabilities, "STARTTLS"))
382 realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname;
383 ok = gen_transact(sock, "STARTTLS");
385 /* We use "tls1" instead of ctl->sslproto, as we want STARTTLS,
386 * not other SSL protocols
388 if (ok == PS_SUCCESS &&
389 SSLOpen(sock,ctl->sslcert,ctl->sslkey,"tls1",ctl->sslcertck, ctl->sslcertpath,ctl->sslfingerprint,realhost,ctl->server.pollname) == -1)
391 if (!ctl->sslproto && !ctl->wehaveauthed)
393 ctl->sslproto = xstrdup("");
394 /* repoll immediately */
398 GT_("SSL connection failed.\n"));
404 * RFC 2595 says this:
406 * "Once TLS has been started, the client MUST discard cached
407 * information about server capabilities and SHOULD re-issue the
408 * CAPABILITY command. This is necessary to protect against
409 * man-in-the-middle attacks which alter the capabilities list prior
410 * to STARTTLS. The server MAY advertise different capabilities
413 capa_probe(sock, ctl);
415 #endif /* SSL_ENABLE */
418 * Time to authenticate the user.
419 * Try the protocol variants that don't require passwords first.
424 if ((ctl->server.authenticate == A_ANY
425 || ctl->server.authenticate == A_GSSAPI)
426 && strstr(capabilities, "AUTH=GSSAPI"))
428 if ((ok = do_gssauth(sock, "AUTHENTICATE", "imap",
429 ctl->server.truename, ctl->remotename)))
431 /* SASL cancellation of authentication */
433 if (ctl->server.authenticate != A_ANY)
442 if ((ctl->server.authenticate == A_ANY
443 || ctl->server.authenticate == A_KERBEROS_V4
444 || ctl->server.authenticate == A_KERBEROS_V5)
445 && strstr(capabilities, "AUTH=KERBEROS_V4"))
447 if ((ok = do_rfc1731(sock, "AUTHENTICATE", ctl->server.truename)))
449 /* SASL cancellation of authentication */
451 if(ctl->server.authenticate != A_ANY)
457 #endif /* KERBEROS_V4 */
460 * No such luck. OK, now try the variants that mask your password
461 * in a challenge-response.
464 if ((ctl->server.authenticate == A_ANY && strstr(capabilities, "AUTH=CRAM-MD5"))
465 || ctl->server.authenticate == A_CRAM_MD5)
467 if ((ok = do_cram_md5 (sock, "AUTHENTICATE", ctl, NULL)))
469 /* SASL cancellation of authentication */
471 if(ctl->server.authenticate != A_ANY)
479 if ((ctl->server.authenticate == A_ANY
480 || ctl->server.authenticate == A_OTP)
481 && strstr(capabilities, "AUTH=X-OTP")) {
482 if ((ok = do_otp(sock, "AUTHENTICATE", ctl)))
484 /* SASL cancellation of authentication */
486 if(ctl->server.authenticate != A_ANY)
493 if (ctl->server.authenticate == A_OTP)
496 GT_("Required OTP capability not compiled into fetchmail\n"));
498 #endif /* OPIE_ENABLE */
501 if ((ctl->server.authenticate == A_ANY
502 || ctl->server.authenticate == A_NTLM)
503 && strstr (capabilities, "AUTH=NTLM")) {
504 if ((ok = do_imap_ntlm(sock, ctl)))
506 /* SASL cancellation of authentication */
508 if(ctl->server.authenticate != A_ANY)
515 if (ctl->server.authenticate == A_NTLM)
518 GT_("Required NTLM capability not compiled into fetchmail\n"));
520 #endif /* NTLM_ENABLE */
522 #ifdef __UNUSED__ /* The Cyrus IMAP4rev1 server chokes on this */
523 /* this handles either AUTH=LOGIN or AUTH-LOGIN */
524 if ((imap_version >= IMAP4rev1) && (!strstr(capabilities, "LOGIN")))
527 GT_("Required LOGIN capability not supported by server\n"));
529 #endif /* __UNUSED__ */
532 * We're stuck with sending the password en clair.
533 * The reason for this odd-looking logic is that some
534 * servers return LOGINDISABLED even though login
535 * actually works. So arrange things in such a way that
536 * setting auth passwd makes it ignore this capability.
538 if((ctl->server.authenticate==A_ANY&&!strstr(capabilities,"LOGINDISABLED"))
539 || ctl->server.authenticate == A_PASSWORD)
541 /* these sizes guarantee no buffer overflow */
542 char *remotename, *password;
544 rnl = 2 * strlen(ctl->remotename) + 1;
545 pwl = 2 * strlen(ctl->password) + 1;
546 remotename = xmalloc(rnl);
547 password = xmalloc(pwl);
549 imap_canonicalize(remotename, ctl->remotename, rnl);
550 imap_canonicalize(password, ctl->password, pwl);
552 snprintf(shroud, sizeof (shroud), "\"%s\"", password);
553 ok = gen_transact(sock, "LOGIN \"%s\" \"%s\"", remotename, password);
558 /* this is for servers which claim to support TLS, but actually
560 if (did_stls && ok == PS_SOCKET && !ctl->sslproto && !ctl->wehaveauthed)
562 ctl->sslproto = xstrdup("");
563 /* repoll immediately */
569 /* SASL cancellation of authentication */
571 if(ctl->server.authenticate != A_ANY)
581 static int internal_expunge(int sock)
582 /* ship an expunge, resetting associated counters */
586 actual_deletions = 0;
588 if ((ok = gen_transact(sock, "EXPUNGE")))
591 /* if there is a mismatch between the number of mails which should
592 * have been expunged and the number of mails actually expunged,
593 * another email client may be deleting mails. Quit here,
594 * otherwise fetchmail gets out-of-sync with the imap server,
595 * reports the wrong size to the SMTP server on MAIL FROM: and
596 * triggers a "message ... was not the expected length" error on
597 * every subsequent mail */
598 if (deletions > 0 && deletions != actual_deletions)
601 GT_("mail expunge mismatch (%d actual != %d expected)\n"),
602 actual_deletions, deletions);
607 expunged += deletions;
610 #ifdef IMAP_UID /* not used */
612 #endif /* IMAP_UID */
617 static int imap_idle(int sock)
618 /* start an RFC2177 IDLE, or fake one if unsupported */
622 saved_timeout = mytimeout;
625 /* special timeout to terminate the IDLE and re-issue it
626 * at least every 28 minutes:
627 * (the server may have an inactivity timeout) */
628 mytimeout = 1680; /* 28 min */
630 /* enter IDLE mode */
631 ok = gen_transact(sock, "IDLE");
633 if (ok == PS_IDLETIMEOUT) {
634 /* send "DONE" continuation */
635 SockWrite(sock, "DONE\r\n", 6);
636 if (outlevel >= O_MONITOR)
637 report(stdout, "IMAP> DONE\n");
638 /* reset stage and timeout here: we are not idling any more */
639 mytimeout = saved_timeout;
641 /* get OK IDLE message */
642 ok = imap_ok(sock, NULL);
644 } else { /* no idle support, fake it */
645 /* Note: stage and timeout have not been changed here as NOOP
647 ok = gen_transact(sock, "NOOP");
649 /* no error, but no new mail either */
650 if (ok == PS_SUCCESS && recentcount == 0)
652 /* There are some servers who do send new mail
653 * notification out of the blue. This is in compliance
654 * with RFC 2060 section 5.3. Wait for that with a low
658 /* We are waiting for notification; no tag needed */
660 /* wait (briefly) for an unsolicited status update */
661 ok = imap_ok(sock, NULL);
662 if (ok == PS_IDLETIMEOUT) {
663 /* no notification came; ok */
669 /* restore normal timeout value */
671 mytimeout = saved_timeout;
677 static int imap_getrange(int sock,
680 int *countp, int *newp, int *bytes)
681 /* get range of messages to be fetched */
684 char buf[MSGBUFSIZE+1], *cp;
686 /* find out how many messages are waiting */
691 /* deleted mails have already been expunged by
692 * end_mailbox_poll().
694 * recentcount is already set here by the last imap command which
695 * returned RECENT on detecting new mail. if recentcount is 0, wait
698 * this is a while loop because imap_idle() might return on other
699 * mailbox changes also */
700 while (recentcount == 0 && do_idle) {
702 ok = imap_idle(sock);
705 report(stderr, GT_("re-poll failed\n"));
709 /* if recentcount is 0, return no mail */
710 if (recentcount == 0)
712 if (outlevel >= O_DEBUG)
713 report(stdout, ngettext("%d message waiting after re-poll\n",
714 "%d messages waiting after re-poll\n",
720 ok = gen_transact(sock,
721 check_only ? "EXAMINE \"%s\"" : "SELECT \"%s\"",
722 folder ? folder : "INBOX");
723 /* imap_ok returns PS_LOCKBUSY for READ-ONLY folders,
724 * which we can safely use in fetchall keep only */
725 if (ok == PS_LOCKBUSY && ctl->fetchall && ctl-> keep)
730 report(stderr, GT_("mailbox selection failed\n"));
733 else if (outlevel >= O_DEBUG)
734 report(stdout, ngettext("%d message waiting after first poll\n",
735 "%d messages waiting after first poll\n",
738 /* no messages? then we may need to idle until we get some */
739 while (count == 0 && do_idle) {
740 ok = imap_idle(sock);
743 report(stderr, GT_("re-poll failed\n"));
749 * We should have an expunge here to
750 * a) avoid fetching deleted mails during 'fetchall'
751 * b) getting a wrong count of mails during 'no fetchall'
753 if (!check_only && !ctl->keep && count > 0)
755 ok = internal_expunge(sock);
758 report(stderr, GT_("expunge failed\n"));
761 if (outlevel >= O_DEBUG)
762 report(stdout, ngettext("%d message waiting after expunge\n",
763 "%d messages waiting after expunge\n",
772 /* OK, now get a count of unseen messages and their indices */
773 if (!ctl->fetchall && count > 0)
776 free(unseen_messages);
777 unseen_messages = xmalloc(count * sizeof(unsigned int));
778 memset(unseen_messages, 0, count * sizeof(unsigned int));
781 /* don't count deleted messages, in case user enabled keep last time */
782 gen_send(sock, "SEARCH UNSEEN NOT DELETED");
784 ok = gen_recv(sock, buf, sizeof(buf));
787 report(stderr, GT_("search for unseen messages failed\n"));
790 else if ((cp = strstr(buf, "* SEARCH")))
794 cp += 8; /* skip "* SEARCH" */
795 /* startcount is higher than count so that if there are no
796 * unseen messages, imap_getsizes() will not need to do
798 startcount = count + 1;
800 while (*cp && unseen < count)
802 /* skip whitespace */
803 while (*cp && isspace((unsigned char)*cp))
809 * Message numbers are between 1 and 2^32 inclusive,
810 * so unsigned int is large enough.
812 um=(unsigned int)strtol(cp,&ep,10);
815 unseen_messages[unseen++] = um;
816 if (outlevel >= O_DEBUG)
817 report(stdout, GT_("%u is unseen\n"), um);
826 (tag[0] != '\0' && strncmp(buf, tag, strlen(tag)));
828 if (outlevel >= O_DEBUG && unseen > 0)
829 report(stdout, GT_("%u is first unseen\n"), startcount);
840 static int imap_getpartialsizes(int sock, int first, int last, int *sizes)
841 /* capture the sizes of messages #first-#last */
843 char buf [MSGBUFSIZE+1];
846 * Some servers (as in, PMDF5.1-9.1 under OpenVMS 6.1)
847 * won't accept 1:1 as valid set syntax. Some implementors
848 * should be taken out and shot for excessive anality.
850 * Microsoft Exchange (brain-dead piece of crap that it is)
851 * sometimes gets its knickers in a knot about bodiless messages.
852 * You may see responses like this:
854 * fetchmail: IMAP> A0004 FETCH 1:9 RFC822.SIZE
855 * fetchmail: IMAP< * 2 FETCH (RFC822.SIZE 1187)
856 * fetchmail: IMAP< * 3 FETCH (RFC822.SIZE 3954)
857 * fetchmail: IMAP< * 4 FETCH (RFC822.SIZE 1944)
858 * fetchmail: IMAP< * 5 FETCH (RFC822.SIZE 2933)
859 * fetchmail: IMAP< * 6 FETCH (RFC822.SIZE 1854)
860 * fetchmail: IMAP< * 7 FETCH (RFC822.SIZE 34054)
861 * fetchmail: IMAP< * 8 FETCH (RFC822.SIZE 5561)
862 * fetchmail: IMAP< * 9 FETCH (RFC822.SIZE 1101)
863 * fetchmail: IMAP< A0004 NO The requested item could not be found.
865 * This means message 1 has only headers. For kicks and grins
866 * you can telnet in and look:
868 * A003 NO The requested item could not be found.
869 * A004 fetch 1 rfc822.header
870 * A004 NO The requested item could not be found.
872 * * 1 FETCH (BODY ("TEXT" "PLAIN" ("CHARSET" "US-ASCII") NIL NIL "7BIT" 35 3))
873 * A006 OK FETCH completed.
875 * To get around this, we terminate the read loop on a NO and count
876 * on the fact that the sizes array has been preinitialized with a
877 * known-bad size value.
880 /* expunges change the fetch numbers */
885 gen_send(sock, "FETCH %d RFC822.SIZE", last);
886 else if (last > first)
887 gen_send(sock, "FETCH %d:%d RFC822.SIZE", first, last);
888 else /* no unseen messages! */
892 unsigned int num, size;
896 if ((ok = gen_recv(sock, buf, sizeof(buf))))
898 /* we want response matching to be case-insensitive */
899 for (cp = buf; *cp; cp++)
900 *cp = toupper((unsigned char)*cp);
901 /* an untagged NO means that a message was not readable */
902 if (strstr(buf, "* NO"))
904 else if (strstr(buf, "OK") || strstr(buf, "NO"))
906 else if (sscanf(buf, "* %u FETCH (RFC822.SIZE %u)", &num, &size) == 2
907 /* some servers (like mail.internode.on.net bld-mail04) return UID information here
909 * IMAP> A0005 FETCH 1 RFC822.SIZE
910 * IMAP< * 1 FETCH (UID 16 RFC822.SIZE 1447)
911 * IMAP< A0005 OK FETCH completed
914 || sscanf(buf, "* %u FETCH (UID %*s RFC822.SIZE %u)", &num, &size) == 2)
916 if (num >= first && num <= last)
917 sizes[num - first] = size;
920 GT_("Warning: ignoring bogus data for message sizes returned by the server.\n"));
927 static int imap_getsizes(int sock, int count, int *sizes)
928 /* capture the sizes of all messages */
930 return imap_getpartialsizes(sock, 1, count, sizes);
933 static int imap_is_old(int sock, struct query *ctl, int number)
934 /* is the given message old? */
940 * Expunges change the fetch numbers, but unseen_messages contains
941 * indices from before any expungees were done. So neither the
942 * argument nor the values in message_sequence need to be decremented.
946 for (i = 0; i < unseen; i++)
947 if (unseen_messages[i] == number)
956 static char *skip_token(char *ptr)
958 while(isspace((unsigned char)*ptr)) ptr++;
959 while(!isspace((unsigned char)*ptr) && !iscntrl((unsigned char)*ptr)) ptr++;
960 while(isspace((unsigned char)*ptr)) ptr++;
964 static int imap_fetch_headers(int sock, struct query *ctl,int number,int *lenp)
965 /* request headers of nth message */
967 char buf [MSGBUFSIZE+1];
970 /* expunges change the fetch numbers */
974 * This is blessed by RFC1176, RFC1730, RFC2060.
975 * According to the RFCs, it should *not* set the \Seen flag.
977 gen_send(sock, "FETCH %d RFC822.HEADER", number);
979 /* looking for FETCH response */
985 if ((ok = gen_recv(sock, buf, sizeof(buf))))
987 ptr = skip_token(buf); /* either "* " or "AXXXX " */
988 if (sscanf(ptr, "%d FETCH (RFC822.HEADER {%d}", &num, lenp) == 2
989 /* some servers (like mail.internode.on.net bld-mail04) return UID information here
991 * IMAP> A0006 FETCH 1 RFC822.HEADER
992 * IMAP< * 1 FETCH (UID 16 RFC822.HEADER {1360}
995 * IMAP< A0006 OK FETCH completed
998 || sscanf(ptr, "%d FETCH (UID %*s RFC822.HEADER {%d}", &num, lenp) == 2)
1000 /* try to recover from chronically fucked-up M$ Exchange servers */
1001 else if (!strncmp(ptr, "NO", 2))
1003 /* wait for a tagged response */
1004 if (strstr (buf, "* NO"))
1006 return(PS_TRANSIENT);
1008 else if (!strncmp(ptr, "BAD", 3))
1010 /* wait for a tagged response */
1011 if (strstr (buf, "* BAD"))
1013 return(PS_TRANSIENT);
1023 static int imap_fetch_body(int sock, struct query *ctl, int number, int *lenp)
1024 /* request body of nth message */
1026 char buf [MSGBUFSIZE+1], *cp;
1029 /* expunges change the fetch numbers */
1033 * If we're using IMAP4, we can fetch the message without setting its
1034 * seen flag. This is good! It means that if the protocol exchange
1035 * craps out during the message, it will still be marked `unseen' on
1038 * According to RFC2060, and Mark Crispin the IMAP maintainer,
1039 * FETCH %d BODY[TEXT] and RFC822.TEXT are "functionally
1040 * equivalent". However, we know of at least one server that
1041 * treats them differently in the presence of MIME attachments;
1042 * the latter form downloads the attachment, the former does not.
1043 * The server is InterChange, and the fool who implemented this
1044 * misfeature ought to be strung up by his thumbs.
1046 * When I tried working around this by disabling use of the 4rev1 form,
1047 * I found that doing this breaks operation with M$ Exchange.
1048 * Annoyingly enough, Exchange's refusal to cope is technically legal
1049 * under RFC2062. Trust Microsoft, the Great Enemy of interoperability
1050 * standards, to find a way to make standards compliance irritating....
1052 switch (imap_version)
1054 case IMAP4rev1: /* RFC 2060 */
1055 gen_send(sock, "FETCH %d BODY.PEEK[TEXT]", number);
1058 case IMAP4: /* RFC 1730 */
1059 gen_send(sock, "FETCH %d RFC822.TEXT.PEEK", number);
1062 default: /* RFC 1176 */
1063 gen_send(sock, "FETCH %d RFC822.TEXT", number);
1067 /* looking for FETCH response */
1071 if ((ok = gen_recv(sock, buf, sizeof(buf))))
1074 (!strstr(buf+4, "FETCH") || sscanf(buf+2, "%d", &num) != 1);
1080 * Try to extract a length from the FETCH response. RFC2060 requires
1081 * it to be present, but at least one IMAP server (Novell GroupWise)
1082 * botches this. The overflow check is needed because of a broken
1083 * server called dbmail that returns huge garbage lengths.
1085 if ((cp = strchr(buf, '{'))) {
1087 *lenp = (int)strtol(cp + 1, (char **)NULL, 10);
1088 if (errno == ERANGE || *lenp < 0)
1089 *lenp = -1; /* length is too big/small for us to handle */
1092 *lenp = -1; /* missing length part in FETCH reponse */
1097 static int imap_trail(int sock, struct query *ctl, int number, const char *tag)
1098 /* discard tail of FETCH response after reading message text */
1100 /* expunges change the fetch numbers */
1101 /* number -= expunged; */
1105 char buf[MSGBUFSIZE+1], *t;
1108 if ((ok = gen_recv(sock, buf, sizeof(buf))))
1111 /* UW IMAP returns "OK FETCH", Cyrus returns "OK Completed" */
1112 if (strncmp(buf, tag, strlen(tag)) == 0) {
1113 t = buf + strlen(tag);
1114 t += strspn(t, " \t");
1115 if (strncmp(t, "OK", 2) == 0)
1123 static int imap_delete(int sock, struct query *ctl, int number)
1124 /* set delete flag for given message */
1128 /* expunges change the fetch numbers */
1132 * Use SILENT if possible as a minor throughput optimization.
1133 * Note: this has been dropped from IMAP4rev1.
1135 * We set Seen because there are some IMAP servers (notably HP
1136 * OpenMail) that do message-receipt DSNs, but only when the seen
1137 * bit is set. This is the appropriate time -- we get here right
1138 * after the local SMTP response that says delivery was
1141 if ((ok = gen_transact(sock,
1142 imap_version == IMAP4
1143 ? "STORE %d +FLAGS.SILENT (\\Seen \\Deleted)"
1144 : "STORE %d +FLAGS (\\Seen \\Deleted)",
1151 * We do an expunge after expunge_period messages, rather than
1152 * just before quit, so that a line hit during a long session
1153 * won't result in lots of messages being fetched again during
1156 if (NUM_NONZERO(expunge_period) && (deletions % expunge_period) == 0)
1158 if ((ok = internal_expunge(sock)))
1165 static int imap_mark_seen(int sock, struct query *ctl, int number)
1166 /* mark the given message as seen */
1168 return(gen_transact(sock,
1169 imap_version == IMAP4
1170 ? "STORE %d +FLAGS.SILENT (\\Seen)"
1171 : "STORE %d +FLAGS (\\Seen)",
1175 static int imap_end_mailbox_poll(int sock, struct query *ctl)
1176 /* cleanup mailbox before we idle or switch to another one */
1179 internal_expunge(sock);
1183 static int imap_logout(int sock, struct query *ctl)
1184 /* send logout command */
1186 /* if any un-expunged deletions remain, ship an expunge now */
1188 internal_expunge(sock);
1191 /* Memory clean-up */
1192 if (unseen_messages)
1193 free(unseen_messages);
1194 #endif /* USE_SEARCH */
1196 return(gen_transact(sock, "LOGOUT"));
1199 static const struct method imap =
1201 "IMAP", /* Internet Message Access Protocol */
1204 TRUE, /* this is a tagged protocol */
1205 FALSE, /* no message delimiter */
1206 imap_ok, /* parse command response */
1207 imap_getauth, /* get authorization */
1208 imap_getrange, /* query range of messages */
1209 imap_getsizes, /* get sizes of messages (used for ESMTP SIZE option) */
1210 imap_getpartialsizes, /* get sizes of subset of messages (used for ESMTP SIZE option) */
1211 imap_is_old, /* no UID check */
1212 imap_fetch_headers, /* request given message headers */
1213 imap_fetch_body, /* request given message body */
1214 imap_trail, /* eat message trailer */
1215 imap_delete, /* delete the message */
1216 imap_mark_seen, /* how to mark a message as seen */
1217 imap_end_mailbox_poll, /* end-of-mailbox processing */
1218 imap_logout, /* expunge and exit */
1219 TRUE, /* yes, we can re-poll */
1222 int doIMAP(struct query *ctl)
1223 /* retrieve messages using IMAP Version 2bis or Version 4 */
1225 return(do_protocol(ctl, &imap));
1228 /* imap.c ends here */