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)
16 #include "fetchmail.h"
22 #endif /* OPIE_ENABLE */
24 #ifndef strstr /* glibc-2.1 declares this as a macro */
25 extern char *strstr(); /* needed on sysV68 R3V7.1. */
28 /* imap_version values */
29 #define IMAP2 -1 /* IMAP2 or IMAP2BIS, RFC1176 */
30 #define IMAP4 0 /* IMAP4 rev 0, RFC1730 */
31 #define IMAP4rev1 1 /* IMAP4 rev 1, RFC2060 */
33 static int count = 0, recentcount = 0, unseen = 0, deletions = 0;
34 static unsigned int startcount = 1;
35 static int expunged, expunge_period, saved_timeout = 0;
36 static int imap_version, preauth;
38 static char capabilities[MSGBUFSIZE+1];
39 static unsigned int *unseen_messages;
41 static int imap_ok(int sock, char *argbuf)
42 /* parse command response */
44 char buf[MSGBUFSIZE+1];
50 if ((ok = gen_recv(sock, buf, sizeof(buf))))
53 /* all tokens in responses are caseblind */
54 for (cp = buf; *cp; cp++)
58 /* interpret untagged status responses */
59 if (strstr(buf, "* CAPABILITY"))
60 strncpy(capabilities, buf + 12, sizeof(capabilities));
61 else if (strstr(buf, "EXISTS"))
65 * Don't trust the message count passed by the server.
66 * Without this check, it might be possible to do a
67 * DNS-spoofing attack that would pass back a ridiculous
68 * count, and allocate a malloc area that would overlap
69 * a portion of the stack.
71 if (count > INT_MAX/sizeof(int))
73 report(stderr, "bogus message count!");
78 * Nasty kluge to handle RFC2177 IDLE. If we know we're idling
79 * we can't wait for the tag matching the IDLE; we have to tell the
80 * server the IDLE is finished by shipping back a DONE when we
81 * see an EXISTS. Only after that will a tagged response be
82 * shipped. The idling flag also gets cleared on a timeout.
84 if (stage == STAGE_IDLE)
86 /* we do our own write and report here to disable tagging */
87 SockWrite(sock, "DONE\r\n", 6);
88 if (outlevel >= O_MONITOR)
89 report(stdout, "IMAP> DONE\n");
91 mytimeout = saved_timeout;
95 else if (strstr(buf, "RECENT"))
97 recentcount = atoi(buf+2);
99 else if (strstr(buf, "PREAUTH"))
102 * The server may decide to make the mailbox read-only,
103 * which causes fetchmail to go into a endless loop
104 * fetching the same message over and over again.
106 * However, for check_only, we use EXAMINE which will
107 * mark the mailbox read-only as per the RFC.
109 * This checks for the condition and aborts if
110 * the mailbox is read-only.
112 * See RFC 2060 section 6.3.1 (SELECT).
113 * See RFC 2060 section 6.3.2 (EXAMINE).
115 else if (!check_only && strstr(buf, "[READ-ONLY]"))
118 (tag[0] != '\0' && strncmp(buf, tag, strlen(tag)));
131 for (cp = buf; !isspace(*cp); cp++)
136 if (strncmp(cp, "OK", 2) == 0)
142 else if (strncmp(cp, "BAD", 3) == 0)
144 else if (strncmp(cp, "NO", 2) == 0)
146 if (stage == STAGE_GETAUTH)
147 return(PS_AUTHFAIL); /* RFC2060, 6.2.2 */
159 static tSmbNtlmAuthRequest request;
160 static tSmbNtlmAuthChallenge challenge;
161 static tSmbNtlmAuthResponse response;
164 * NTLM support by Grant Edwards.
166 * Handle MS-Exchange NTLM authentication method. This is the same
167 * as the NTLM auth used by Samba for SMB related services. We just
168 * encode the packets in base64 instead of sending them out via a
171 * Much source (ntlm.h, smb*.c smb*.h) was borrowed from Samba.
174 static int do_imap_ntlm(int sock, struct query *ctl)
179 gen_send(sock, "AUTHENTICATE NTLM");
181 if ((result = gen_recv(sock, msgbuf, sizeof msgbuf)))
184 if (msgbuf[0] != '+')
187 buildSmbNtlmAuthRequest(&request,ctl->remotename,NULL);
189 if (outlevel >= O_DEBUG)
190 dumpSmbNtlmAuthRequest(stdout, &request);
192 memset(msgbuf,0,sizeof msgbuf);
193 to64frombits (msgbuf, (unsigned char*)&request, SmbLength(&request));
195 if (outlevel >= O_MONITOR)
196 report(stdout, "IMAP> %s\n", msgbuf);
198 strcat(msgbuf,"\r\n");
199 SockWrite (sock, msgbuf, strlen (msgbuf));
201 if ((gen_recv(sock, msgbuf, sizeof msgbuf)))
204 len = from64tobits ((char*)&challenge, msgbuf, sizeof(challenge));
206 if (outlevel >= O_DEBUG)
207 dumpSmbNtlmAuthChallenge(stdout, &challenge);
209 buildSmbNtlmAuthResponse(&challenge, &response,ctl->remotename,ctl->password);
211 if (outlevel >= O_DEBUG)
212 dumpSmbNtlmAuthResponse(stdout, &response);
214 memset(msgbuf,0,sizeof msgbuf);
215 to64frombits (msgbuf, (unsigned char*)&response, SmbLength(&response));
217 if (outlevel >= O_MONITOR)
218 report(stdout, "IMAP> %s\n", msgbuf);
220 strcat(msgbuf,"\r\n");
221 SockWrite (sock, msgbuf, strlen (msgbuf));
223 if ((result = gen_recv (sock, msgbuf, sizeof msgbuf)))
226 if (strstr (msgbuf, "OK"))
233 static int imap_canonicalize(char *result, char *raw, int maxlen)
234 /* encode an IMAP password as per RFC1730's quoting conventions */
239 for (i = 0; i < strlen(raw) && i < maxlen; i++)
241 if ((raw[i] == '\\') || (raw[i] == '"'))
243 result[j++] = raw[i];
250 static int imap_getauth(int sock, struct query *ctl, char *greeting)
251 /* apply for connection authorization */
255 /* probe to see if we're running IMAP4 and can use RFC822.PEEK */
256 capabilities[0] = '\0';
257 if ((ok = gen_transact(sock, "CAPABILITY")) == PS_SUCCESS)
261 /* capability checks are supposed to be caseblind */
262 for (cp = capabilities; *cp; cp++)
265 /* UW-IMAP server 10.173 notifies in all caps, but RFC2060 says we
266 should expect a response in mixed-case */
267 if (strstr(capabilities, "IMAP4REV1"))
269 imap_version = IMAP4rev1;
270 if (outlevel >= O_DEBUG)
271 report(stdout, GT_("Protocol identified as IMAP4 rev 1\n"));
275 imap_version = IMAP4;
276 if (outlevel >= O_DEBUG)
277 report(stdout, GT_("Protocol identified as IMAP4 rev 0\n"));
280 else if (ok == PS_ERROR)
282 imap_version = IMAP2;
283 if (outlevel >= O_DEBUG)
284 report(stdout, GT_("Protocol identified as IMAP2 or IMAP2BIS\n"));
289 peek_capable = (imap_version >= IMAP4);
292 * Assumption: expunges are cheap, so we want to do them
293 * after every message unless user said otherwise.
295 if (NUM_SPECIFIED(ctl->expunge))
296 expunge_period = NUM_VALUE_OUT(ctl->expunge);
301 * Handle idling. We depend on coming through here on startup
302 * and after each timeout (including timeouts during idles).
304 if (strstr(capabilities, "IDLE") && ctl->idle)
307 if (outlevel >= O_VERBOSE)
308 report(stdout, GT_("will idle after poll\n"));
312 * If either (a) we saw a PREAUTH token in the greeting, or
313 * (b) the user specified ssh preauthentication, then we're done.
315 if (preauth || ctl->server.authenticate == A_SSH)
317 preauth = FALSE; /* reset for the next session */
322 * Time to authenticate the user.
323 * Try the protocol variants that don't require passwords first.
328 if ((ctl->server.authenticate == A_ANY
329 || ctl->server.authenticate == A_GSSAPI)
330 && strstr(capabilities, "AUTH=GSSAPI"))
331 if(ok = do_gssauth(sock, "AUTHENTICATE", ctl->server.truename, ctl->remotename))
333 /* SASL cancellation of authentication */
335 if(ctl->server.authenticate != A_ANY)
343 if ((ctl->server.authenticate == A_ANY
344 || ctl->server.authenticate == A_KERBEROS_V4
345 || ctl->server.authenticate == A_KERBEROS_V5)
346 && strstr(capabilities, "AUTH=KERBEROS_V4"))
348 if ((ok = do_rfc1731(sock, "AUTHENTICATE", ctl->server.truename)))
350 /* SASL cancellation of authentication */
352 if(ctl->server.authenticate != A_ANY)
358 #endif /* KERBEROS_V4 */
361 if ((ctl->server.authenticate == A_ANY)
363 && strstr(capabilities, "STARTTLS"))
367 realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname;
368 gen_transact(sock, "STARTTLS");
370 /* We use "tls1" instead of ctl->sslproto, as we want STARTTLS,
371 * not other SSL protocols
373 if (SSLOpen(sock,ctl->sslcert,ctl->sslkey,"tls1",ctl->sslcertck, ctl->sslcertpath,ctl->sslfingerprint,realhost,ctl->server.pollname) == -1)
376 GT_("SSL connection failed.\n"));
380 #endif /* SSL_ENABLE */
383 * No such luck. OK, now try the variants that mask your password
384 * in a challenge-response.
387 if ((ctl->server.authenticate == A_ANY
388 || ctl->server.authenticate == A_CRAM_MD5)
389 && strstr(capabilities, "AUTH=CRAM-MD5"))
391 if ((ok = do_cram_md5 (sock, "AUTHENTICATE", ctl, NULL)))
393 /* SASL cancellation of authentication */
395 if(ctl->server.authenticate != A_ANY)
403 if ((ctl->server.authenticate == A_ANY
404 || ctl->server.authenticate == A_OTP)
405 && strstr(capabilities, "AUTH=X-OTP"))
406 if ((ok = do_otp(sock, "AUTHENTICATE", ctl)))
408 /* SASL cancellation of authentication */
410 if(ctl->server.authenticate != A_ANY)
416 if (ctl->server.authenticate == A_OTP)
419 GT_("Required OTP capability not compiled into fetchmail\n"));
421 #endif /* OPIE_ENABLE */
424 if ((ctl->server.authenticate == A_ANY
425 || ctl->server.authenticate == A_NTLM)
426 && strstr (capabilities, "AUTH=NTLM")) {
427 if ((ok = do_imap_ntlm(sock, ctl)))
429 /* SASL cancellation of authentication */
431 if(ctl->server.authenticate != A_ANY)
438 if (ctl->server.authenticate == A_NTLM)
441 GT_("Required NTLM capability not compiled into fetchmail\n"));
443 #endif /* NTLM_ENABLE */
445 #ifdef __UNUSED__ /* The Cyrus IMAP4rev1 server chokes on this */
446 /* this handles either AUTH=LOGIN or AUTH-LOGIN */
447 if ((imap_version >= IMAP4rev1) && (!strstr(capabilities, "LOGIN")))
450 GT_("Required LOGIN capability not supported by server\n"));
452 #endif /* __UNUSED__ */
454 /* we're stuck with sending the password en clair */
455 if ((ctl->server.authenticate == A_ANY
456 || ctl->server.authenticate == A_PASSWORD)
457 && !strstr (capabilities, "LOGINDISABLED"))
459 /* these sizes guarantee no buffer overflow */
460 char remotename[NAMELEN*2+1], password[PASSWORDLEN*2+1];
462 imap_canonicalize(remotename, ctl->remotename, NAMELEN);
463 imap_canonicalize(password, ctl->password, PASSWORDLEN);
465 strcpy(shroud, password);
466 ok = gen_transact(sock, "LOGIN \"%s\" \"%s\"", remotename, password);
470 /* SASL cancellation of authentication */
472 if(ctl->server.authenticate != A_ANY)
482 static int internal_expunge(int sock)
483 /* ship an expunge, resetting associated counters */
487 if ((ok = gen_transact(sock, "EXPUNGE")))
490 expunged += deletions;
493 #ifdef IMAP_UID /* not used */
495 #endif /* IMAP_UID */
500 static int imap_idle(int sock)
501 /* start an RFC2177 IDLE */
504 saved_timeout = mytimeout;
507 return (gen_transact(sock, "IDLE"));
510 static int imap_getrange(int sock,
513 int *countp, int *newp, int *bytes)
514 /* get range of messages to be fetched */
517 char buf[MSGBUFSIZE+1], *cp;
519 /* find out how many messages are waiting */
525 * We have to have an expunge here, otherwise the re-poll will
526 * infinite-loop picking up un-expunged messages -- unless the
527 * expunge period is one and we've been nuking each message
528 * just after deletion.
532 ok = internal_expunge(sock);
535 report(stderr, GT_("expunge failed\n"));
541 * recentcount is already set here by the last imap command which
542 * returned RECENT on detecting new mail. if recentcount is 0, wait
546 /* this is a while loop because imap_idle() might return on other
547 * mailbox changes also */
548 while (recentcount == 0 && do_idle) {
550 ok = imap_idle(sock);
553 report(stderr, GT_("re-poll failed\n"));
557 /* if recentcount is 0, return no mail */
558 if (recentcount == 0)
560 if (outlevel >= O_DEBUG)
561 report(stdout, GT_("%d messages waiting after re-poll\n"), count);
566 ok = gen_transact(sock,
567 check_only ? "EXAMINE \"%s\"" : "SELECT \"%s\"",
568 folder ? folder : "INBOX");
571 report(stderr, GT_("mailbox selection failed\n"));
574 else if (outlevel >= O_DEBUG)
575 report(stdout, GT_("%d messages waiting after first poll\n"), count);
577 /* no messages? then we may need to idle until we get some */
578 while (count == 0 && do_idle) {
579 ok = imap_idle(sock);
582 report(stderr, GT_("re-poll failed\n"));
588 * We should have an expunge here to
589 * a) avoid fetching deleted mails during 'fetchall'
590 * b) getting a wrong count of mails during 'no fetchall'
592 if (!check_only && !ctl->keep && count > 0)
594 ok = internal_expunge(sock);
597 report(stderr, GT_("expunge failed\n"));
600 if (outlevel >= O_DEBUG)
601 report(stdout, GT_("%d messages waiting after expunge\n"), count);
609 /* OK, now get a count of unseen messages and their indices */
610 if (!ctl->fetchall && count > 0)
613 free(unseen_messages);
614 unseen_messages = xmalloc(count * sizeof(unsigned int));
615 memset(unseen_messages, 0, count * sizeof(unsigned int));
618 gen_send(sock, "SEARCH UNSEEN");
620 ok = gen_recv(sock, buf, sizeof(buf));
623 report(stderr, GT_("search for unseen messages failed\n"));
626 else if ((cp = strstr(buf, "* SEARCH")))
630 cp += 8; /* skip "* SEARCH" */
631 /* startcount is higher than count so that if there are no
632 * unseen messages, imap_getsizes() will not need to do
634 startcount = count + 1;
636 while (*cp && unseen < count)
638 /* skip whitespace */
639 while (*cp && isspace(*cp))
645 * Message numbers are between 1 and 2^32 inclusive,
646 * so unsigned int is large enough.
648 um=(unsigned int)strtol(cp,&ep,10);
651 unseen_messages[unseen++] = um;
652 if (outlevel >= O_DEBUG)
653 report(stdout, GT_("%u is unseen\n"), um);
662 (tag[0] != '\0' && strncmp(buf, tag, strlen(tag)));
664 if (outlevel >= O_DEBUG && unseen > 0)
665 report(stdout, GT_("%u is first unseen\n"), startcount);
677 static int imap_getsizes(int sock, int count, int *sizes)
678 /* capture the sizes of all messages */
680 char buf [MSGBUFSIZE+1];
683 * Some servers (as in, PMDF5.1-9.1 under OpenVMS 6.1)
684 * won't accept 1:1 as valid set syntax. Some implementors
685 * should be taken out and shot for excessive anality.
687 * Microsoft Exchange (brain-dead piece of crap that it is)
688 * sometimes gets its knickers in a knot about bodiless messages.
689 * You may see responses like this:
691 * fetchmail: IMAP> A0004 FETCH 1:9 RFC822.SIZE
692 * fetchmail: IMAP< * 2 FETCH (RFC822.SIZE 1187)
693 * fetchmail: IMAP< * 3 FETCH (RFC822.SIZE 3954)
694 * fetchmail: IMAP< * 4 FETCH (RFC822.SIZE 1944)
695 * fetchmail: IMAP< * 5 FETCH (RFC822.SIZE 2933)
696 * fetchmail: IMAP< * 6 FETCH (RFC822.SIZE 1854)
697 * fetchmail: IMAP< * 7 FETCH (RFC822.SIZE 34054)
698 * fetchmail: IMAP< * 8 FETCH (RFC822.SIZE 5561)
699 * fetchmail: IMAP< * 9 FETCH (RFC822.SIZE 1101)
700 * fetchmail: IMAP< A0004 NO The requested item could not be found.
702 * This means message 1 has only headers. For kicks and grins
703 * you can telnet in and look:
705 * A003 NO The requested item could not be found.
706 * A004 fetch 1 rfc822.header
707 * A004 NO The requested item could not be found.
709 * * 1 FETCH (BODY ("TEXT" "PLAIN" ("CHARSET" "US-ASCII") NIL NIL "7BIT" 35 3))
710 * A006 OK FETCH completed.
712 * To get around this, we terminate the read loop on a NO and count
713 * on the fact that the sizes array has been preinitialized with a
714 * known-bad size value.
716 /* if fetchall is specified, startcount is 1;
717 * else if there is new mail, startcount is first unseen message;
718 * else startcount is greater than count.
720 if (count == startcount)
721 gen_send(sock, "FETCH %d RFC822.SIZE", count);
722 else if (count > startcount)
723 gen_send(sock, "FETCH %d:%d RFC822.SIZE", startcount, count);
724 else /* no unseen messages! */
728 unsigned int num, size;
731 if ((ok = gen_recv(sock, buf, sizeof(buf))))
733 /* an untagged NO means that a message was not readable */
734 else if (strstr(buf, "* NO"))
736 else if (strstr(buf, "OK") || strstr(buf, "NO"))
738 else if (sscanf(buf, "* %u FETCH (RFC822.SIZE %u)", &num, &size) == 2) {
739 if (num > 0 && num <= count)
740 sizes[num - 1] = size;
742 report(stderr, "Warning: ignoring bogus data for message sizes returned by the server.\n");
749 static int imap_is_old(int sock, struct query *ctl, int number)
750 /* is the given message old? */
756 * Expunges change the fetch numbers, but unseen_messages contains
757 * indices from before any expungees were done. So neither the
758 * argument nor the values in message_sequence need to be decremented.
762 for (i = 0; i < unseen; i++)
763 if (unseen_messages[i] == number)
772 static char *skip_token(char *ptr)
774 while(isspace(*ptr)) ptr++;
775 while(!isspace(*ptr) && !iscntrl(*ptr)) ptr++;
776 while(isspace(*ptr)) ptr++;
780 static int imap_fetch_headers(int sock, struct query *ctl,int number,int *lenp)
781 /* request headers of nth message */
783 char buf [MSGBUFSIZE+1];
786 /* expunges change the fetch numbers */
790 * This is blessed by RFC1176, RFC1730, RFC2060.
791 * According to the RFCs, it should *not* set the \Seen flag.
793 gen_send(sock, "FETCH %d RFC822.HEADER", number);
795 /* looking for FETCH response */
801 if ((ok = gen_recv(sock, buf, sizeof(buf))))
803 ptr = skip_token(buf); /* either "* " or "AXXXX " */
804 if (sscanf(ptr, "%d FETCH (%*s {%d}", &num, lenp) == 2)
806 /* try to recover from chronically fucked-up M$ Exchange servers */
807 else if (!strncmp(ptr, "NO", 2))
809 /* wait for a tagged response */
810 if (strstr (buf, "* NO"))
812 return(PS_TRANSIENT);
814 else if (!strncmp(ptr, "BAD", 3))
816 /* wait for a tagged response */
817 if (strstr (buf, "* BAD"))
819 return(PS_TRANSIENT);
829 static int imap_fetch_body(int sock, struct query *ctl, int number, int *lenp)
830 /* request body of nth message */
832 char buf [MSGBUFSIZE+1], *cp;
835 /* expunges change the fetch numbers */
839 * If we're using IMAP4, we can fetch the message without setting its
840 * seen flag. This is good! It means that if the protocol exchange
841 * craps out during the message, it will still be marked `unseen' on
844 * However...*don't* do this if we're using keep to suppress deletion!
845 * In that case, marking the seen flag is the only way to prevent the
846 * message from being re-fetched on subsequent runs (and according
847 * to RFC2060 p.43 this fetch should set Seen as a side effect).
849 * According to RFC2060, and Mark Crispin the IMAP maintainer,
850 * FETCH %d BODY[TEXT] and RFC822.TEXT are "functionally
851 * equivalent". However, we know of at least one server that
852 * treats them differently in the presence of MIME attachments;
853 * the latter form downloads the attachment, the former does not.
854 * The server is InterChange, and the fool who implemented this
855 * misfeature ought to be strung up by his thumbs.
857 * When I tried working around this by disabling use of the 4rev1 form,
858 * I found that doing this breaks operation with M$ Exchange.
859 * Annoyingly enough, Exchange's refusal to cope is technically legal
860 * under RFC2062. Trust Microsoft, the Great Enemy of interoperability
861 * standards, to find a way to make standards compliance irritating....
863 switch (imap_version)
865 case IMAP4rev1: /* RFC 2060 */
867 gen_send(sock, "FETCH %d BODY.PEEK[TEXT]", number);
869 gen_send(sock, "FETCH %d BODY[TEXT]", number);
872 case IMAP4: /* RFC 1730 */
874 gen_send(sock, "FETCH %d RFC822.TEXT.PEEK", number);
876 gen_send(sock, "FETCH %d RFC822.TEXT", number);
879 default: /* RFC 1176 */
880 gen_send(sock, "FETCH %d RFC822.TEXT", number);
884 /* looking for FETCH response */
888 if ((ok = gen_recv(sock, buf, sizeof(buf))))
891 (!strstr(buf+4, "FETCH") || sscanf(buf+2, "%d", &num) != 1);
897 * Try to extract a length from the FETCH response. RFC2060 requires
898 * it to be present, but at least one IMAP server (Novell GroupWise)
901 if ((cp = strchr(buf, '{')))
902 *lenp = atoi(cp + 1);
904 *lenp = -1; /* missing length part in FETCH reponse */
909 static int imap_trail(int sock, struct query *ctl, int number)
910 /* discard tail of FETCH response after reading message text */
912 /* expunges change the fetch numbers */
913 /* number -= expunged; */
917 char buf[MSGBUFSIZE+1];
920 if ((ok = gen_recv(sock, buf, sizeof(buf))))
923 /* UW IMAP returns "OK FETCH", Cyrus returns "OK Completed" */
924 if (strstr(buf, "OK"))
929 * Any IMAP server that fails to set Seen on a BODY[TEXT]
930 * fetch violates RFC2060 p.43 (top). This becomes an issue
931 * when keep is on, because seen messages aren't deleted and
932 * get refetched on each poll. As a workaround, if keep is on
933 * we can set the Seen flag explicitly.
935 * This code isn't used yet because we don't know of any IMAP
936 * servers broken in this way.
939 if ((ok = gen_transact(sock,
940 imap_version == IMAP4
941 ? "STORE %d +FLAGS.SILENT (\\Seen)"
942 : "STORE %d +FLAGS (\\Seen)",
945 #endif /* __UNUSED__ */
951 static int imap_delete(int sock, struct query *ctl, int number)
952 /* set delete flag for given message */
956 /* expunges change the fetch numbers */
960 * Use SILENT if possible as a minor throughput optimization.
961 * Note: this has been dropped from IMAP4rev1.
963 * We set Seen because there are some IMAP servers (notably HP
964 * OpenMail) that do message-receipt DSNs, but only when the seen
965 * bit is set. This is the appropriate time -- we get here right
966 * after the local SMTP response that says delivery was
969 if ((ok = gen_transact(sock,
970 imap_version == IMAP4
971 ? "STORE %d +FLAGS.SILENT (\\Seen \\Deleted)"
972 : "STORE %d +FLAGS (\\Seen \\Deleted)",
979 * We do an expunge after expunge_period messages, rather than
980 * just before quit, so that a line hit during a long session
981 * won't result in lots of messages being fetched again during
984 if (NUM_NONZERO(expunge_period) && (deletions % expunge_period) == 0)
985 internal_expunge(sock);
990 static int imap_logout(int sock, struct query *ctl)
991 /* send logout command */
993 /* if any un-expunged deletions remain, ship an expunge now */
995 internal_expunge(sock);
998 /* Memory clean-up */
1000 free(unseen_messages);
1001 #endif /* USE_SEARCH */
1003 return(gen_transact(sock, "LOGOUT"));
1006 const static struct method imap =
1008 "IMAP", /* Internet Message Access Protocol */
1012 #else /* INET6_ENABLE */
1013 143, /* standard IMAP2bis/IMAP4 port */
1014 993, /* ssl IMAP2bis/IMAP4 port */
1015 #endif /* INET6_ENABLE */
1016 TRUE, /* this is a tagged protocol */
1017 FALSE, /* no message delimiter */
1018 imap_ok, /* parse command response */
1019 imap_getauth, /* get authorization */
1020 imap_getrange, /* query range of messages */
1021 imap_getsizes, /* get sizes of messages (used for ESMTP SIZE option) */
1022 imap_is_old, /* no UID check */
1023 imap_fetch_headers, /* request given message headers */
1024 imap_fetch_body, /* request given message body */
1025 imap_trail, /* eat message trailer */
1026 imap_delete, /* delete the message */
1027 imap_logout, /* expunge and exit */
1028 TRUE, /* yes, we can re-poll */
1031 int doIMAP(struct query *ctl)
1032 /* retrieve messages using IMAP Version 2bis or Version 4 */
1034 return(do_protocol(ctl, &imap));
1037 /* imap.c ends here */