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;
37 static flag do_idle, has_idle;
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"))
61 strncpy(capabilities, buf + 12, sizeof(capabilities));
62 capabilities[sizeof(capabilities)-1] = '\0';
64 else if (strstr(buf, "EXISTS"))
68 * Don't trust the message count passed by the server.
69 * Without this check, it might be possible to do a
70 * DNS-spoofing attack that would pass back a ridiculous
71 * count, and allocate a malloc area that would overlap
72 * a portion of the stack.
74 if (count > INT_MAX/sizeof(int))
76 report(stderr, "bogus message count!");
81 * Nasty kluge to handle RFC2177 IDLE. If we know we're idling
82 * we can't wait for the tag matching the IDLE; we have to tell the
83 * server the IDLE is finished by shipping back a DONE when we
84 * see an EXISTS. Only after that will a tagged response be
85 * shipped. The idling flag also gets cleared on a timeout.
87 if (stage == STAGE_IDLE)
89 /* If IDLE isn't supported, we were only sending NOOPs anyway. */
92 /* we do our own write and report here to disable tagging */
93 SockWrite(sock, "DONE\r\n", 6);
94 if (outlevel >= O_MONITOR)
95 report(stdout, "IMAP> DONE\n");
98 mytimeout = saved_timeout;
102 /* a space is required to avoid confusion with the \Recent flag */
103 else if (strstr(buf, " RECENT"))
105 recentcount = atoi(buf+2);
107 else if (strstr(buf, "PREAUTH"))
110 * The server may decide to make the mailbox read-only,
111 * which causes fetchmail to go into a endless loop
112 * fetching the same message over and over again.
114 * However, for check_only, we use EXAMINE which will
115 * mark the mailbox read-only as per the RFC.
117 * This checks for the condition and aborts if
118 * the mailbox is read-only.
120 * See RFC 2060 section 6.3.1 (SELECT).
121 * See RFC 2060 section 6.3.2 (EXAMINE).
123 else if (!check_only && strstr(buf, "[READ-ONLY]"))
126 (tag[0] != '\0' && strncmp(buf, tag, strlen(tag)));
139 for (cp = buf; !isspace(*cp); cp++)
144 if (strncasecmp(cp, "OK", 2) == 0)
150 else if (strncasecmp(cp, "BAD", 3) == 0)
152 else if (strncasecmp(cp, "NO", 2) == 0)
154 if (stage == STAGE_GETAUTH)
155 return(PS_AUTHFAIL); /* RFC2060, 6.2.2 */
167 static tSmbNtlmAuthRequest request;
168 static tSmbNtlmAuthChallenge challenge;
169 static tSmbNtlmAuthResponse response;
172 * NTLM support by Grant Edwards.
174 * Handle MS-Exchange NTLM authentication method. This is the same
175 * as the NTLM auth used by Samba for SMB related services. We just
176 * encode the packets in base64 instead of sending them out via a
179 * Much source (ntlm.h, smb*.c smb*.h) was borrowed from Samba.
182 static int do_imap_ntlm(int sock, struct query *ctl)
187 gen_send(sock, "AUTHENTICATE NTLM");
189 if ((result = gen_recv(sock, msgbuf, sizeof msgbuf)))
192 if (msgbuf[0] != '+')
195 buildSmbNtlmAuthRequest(&request,ctl->remotename,NULL);
197 if (outlevel >= O_DEBUG)
198 dumpSmbNtlmAuthRequest(stdout, &request);
200 memset(msgbuf,0,sizeof msgbuf);
201 to64frombits (msgbuf, (unsigned char*)&request, SmbLength(&request));
203 if (outlevel >= O_MONITOR)
204 report(stdout, "IMAP> %s\n", msgbuf);
206 strcat(msgbuf,"\r\n");
207 SockWrite (sock, msgbuf, strlen (msgbuf));
209 if ((gen_recv(sock, msgbuf, sizeof msgbuf)))
212 len = from64tobits ((char*)&challenge, msgbuf, sizeof(challenge));
214 if (outlevel >= O_DEBUG)
215 dumpSmbNtlmAuthChallenge(stdout, &challenge);
217 buildSmbNtlmAuthResponse(&challenge, &response,ctl->remotename,ctl->password);
219 if (outlevel >= O_DEBUG)
220 dumpSmbNtlmAuthResponse(stdout, &response);
222 memset(msgbuf,0,sizeof msgbuf);
223 to64frombits (msgbuf, (unsigned char*)&response, SmbLength(&response));
225 if (outlevel >= O_MONITOR)
226 report(stdout, "IMAP> %s\n", msgbuf);
228 strcat(msgbuf,"\r\n");
229 SockWrite (sock, msgbuf, strlen (msgbuf));
231 if ((result = gen_recv (sock, msgbuf, sizeof msgbuf)))
234 if (strstr (msgbuf, "OK"))
241 static int imap_canonicalize(char *result, char *raw, int maxlen)
242 /* encode an IMAP password as per RFC1730's quoting conventions */
247 for (i = 0; i < strlen(raw) && i < maxlen; i++)
249 if ((raw[i] == '\\') || (raw[i] == '"'))
251 result[j++] = raw[i];
258 static void capa_probe(int sock, struct query *ctl)
259 /* set capability variables from a CAPA probe */
263 /* probe to see if we're running IMAP4 and can use RFC822.PEEK */
264 capabilities[0] = '\0';
265 if ((ok = gen_transact(sock, "CAPABILITY")) == PS_SUCCESS)
269 /* capability checks are supposed to be caseblind */
270 for (cp = capabilities; *cp; cp++)
273 /* UW-IMAP server 10.173 notifies in all caps, but RFC2060 says we
274 should expect a response in mixed-case */
275 if (strstr(capabilities, "IMAP4REV1"))
277 imap_version = IMAP4rev1;
278 if (outlevel >= O_DEBUG)
279 report(stdout, GT_("Protocol identified as IMAP4 rev 1\n"));
283 imap_version = IMAP4;
284 if (outlevel >= O_DEBUG)
285 report(stdout, GT_("Protocol identified as IMAP4 rev 0\n"));
288 else if (ok == PS_ERROR)
290 imap_version = IMAP2;
291 if (outlevel >= O_DEBUG)
292 report(stdout, GT_("Protocol identified as IMAP2 or IMAP2BIS\n"));
296 * Handle idling. We depend on coming through here on startup
297 * and after each timeout (including timeouts during idles).
302 if (strstr(capabilities, "IDLE"))
306 if (outlevel >= O_VERBOSE)
307 report(stdout, GT_("will idle after poll\n"));
310 peek_capable = (imap_version >= IMAP4);
313 static int imap_getauth(int sock, struct query *ctl, char *greeting)
314 /* apply for connection authorization */
318 flag did_stls = FALSE;
319 #endif /* SSL_ENABLE */
322 * Assumption: expunges are cheap, so we want to do them
323 * after every message unless user said otherwise.
325 if (NUM_SPECIFIED(ctl->expunge))
326 expunge_period = NUM_VALUE_OUT(ctl->expunge);
330 capa_probe(sock, ctl);
333 * If either (a) we saw a PREAUTH token in the greeting, or
334 * (b) the user specified ssh preauthentication, then we're done.
336 if (preauth || ctl->server.authenticate == A_SSH)
338 preauth = FALSE; /* reset for the next session */
343 if ((!ctl->sslproto || !strcmp(ctl->sslproto,"tls1"))
345 && strstr(capabilities, "STARTTLS"))
349 realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname;
350 ok = gen_transact(sock, "STARTTLS");
352 /* We use "tls1" instead of ctl->sslproto, as we want STARTTLS,
353 * not other SSL protocols
355 if (ok == PS_SUCCESS &&
356 SSLOpen(sock,ctl->sslcert,ctl->sslkey,"tls1",ctl->sslcertck, ctl->sslcertpath,ctl->sslfingerprint,realhost,ctl->server.pollname) == -1)
358 if (!ctl->sslproto && !ctl->wehaveauthed)
360 ctl->sslproto = xstrdup("");
361 /* repoll immediately */
365 GT_("SSL connection failed.\n"));
371 * RFC 2595 says this:
373 * "Once TLS has been started, the client MUST discard cached
374 * information about server capabilities and SHOULD re-issue the
375 * CAPABILITY command. This is necessary to protect against
376 * man-in-the-middle attacks which alter the capabilities list prior
377 * to STARTTLS. The server MAY advertise different capabilities
380 capa_probe(sock, ctl);
382 #endif /* SSL_ENABLE */
385 * Time to authenticate the user.
386 * Try the protocol variants that don't require passwords first.
391 if ((ctl->server.authenticate == A_ANY
392 || ctl->server.authenticate == A_GSSAPI)
393 && strstr(capabilities, "AUTH=GSSAPI"))
394 if(ok = do_gssauth(sock, "AUTHENTICATE", ctl->server.truename, ctl->remotename))
396 /* SASL cancellation of authentication */
398 if(ctl->server.authenticate != A_ANY)
406 if ((ctl->server.authenticate == A_ANY
407 || ctl->server.authenticate == A_KERBEROS_V4
408 || ctl->server.authenticate == A_KERBEROS_V5)
409 && strstr(capabilities, "AUTH=KERBEROS_V4"))
411 if ((ok = do_rfc1731(sock, "AUTHENTICATE", ctl->server.truename)))
413 /* SASL cancellation of authentication */
415 if(ctl->server.authenticate != A_ANY)
421 #endif /* KERBEROS_V4 */
424 * No such luck. OK, now try the variants that mask your password
425 * in a challenge-response.
428 if ((ctl->server.authenticate == A_ANY && strstr(capabilities, "AUTH=CRAM-MD5"))
429 || ctl->server.authenticate == A_CRAM_MD5)
431 if ((ok = do_cram_md5 (sock, "AUTHENTICATE", ctl, NULL)))
433 /* SASL cancellation of authentication */
435 if(ctl->server.authenticate != A_ANY)
443 if ((ctl->server.authenticate == A_ANY
444 || ctl->server.authenticate == A_OTP)
445 && strstr(capabilities, "AUTH=X-OTP"))
446 if ((ok = do_otp(sock, "AUTHENTICATE", ctl)))
448 /* SASL cancellation of authentication */
450 if(ctl->server.authenticate != A_ANY)
456 if (ctl->server.authenticate == A_OTP)
459 GT_("Required OTP capability not compiled into fetchmail\n"));
461 #endif /* OPIE_ENABLE */
464 if ((ctl->server.authenticate == A_ANY
465 || ctl->server.authenticate == A_NTLM)
466 && strstr (capabilities, "AUTH=NTLM")) {
467 if ((ok = do_imap_ntlm(sock, ctl)))
469 /* SASL cancellation of authentication */
471 if(ctl->server.authenticate != A_ANY)
478 if (ctl->server.authenticate == A_NTLM)
481 GT_("Required NTLM capability not compiled into fetchmail\n"));
483 #endif /* NTLM_ENABLE */
485 #ifdef __UNUSED__ /* The Cyrus IMAP4rev1 server chokes on this */
486 /* this handles either AUTH=LOGIN or AUTH-LOGIN */
487 if ((imap_version >= IMAP4rev1) && (!strstr(capabilities, "LOGIN")))
490 GT_("Required LOGIN capability not supported by server\n"));
492 #endif /* __UNUSED__ */
495 * We're stuck with sending the password en clair.
496 * The reason for this odd-looking logic is that some
497 * servers return LOGINDISABLED even though login
498 * actually works. So arrange things in such a way that
499 * setting auth passwd makes it ignore this capability.
501 if((ctl->server.authenticate==A_ANY&&!strstr(capabilities,"LOGINDISABLED"))
502 || ctl->server.authenticate == A_PASSWORD)
504 /* these sizes guarantee no buffer overflow */
505 char remotename[NAMELEN*2+1], password[PASSWORDLEN*2+1];
507 imap_canonicalize(remotename, ctl->remotename, NAMELEN);
508 imap_canonicalize(password, ctl->password, PASSWORDLEN);
511 snprintf(shroud, sizeof (shroud), "\"%s\"", password);
513 strcpy(shroud, "\"");
514 strcat(shroud, password);
515 strcat(shroud, "\"");
517 ok = gen_transact(sock, "LOGIN \"%s\" \"%s\"", remotename, password);
520 /* this is for servers which claim to support TLS, but actually
522 if (did_stls && ok == PS_SOCKET && !ctl->sslproto && !ctl->wehaveauthed)
524 ctl->sslproto = xstrdup("");
525 /* repoll immediately */
531 /* SASL cancellation of authentication */
533 if(ctl->server.authenticate != A_ANY)
543 static int internal_expunge(int sock)
544 /* ship an expunge, resetting associated counters */
548 if ((ok = gen_transact(sock, "EXPUNGE")))
551 expunged += deletions;
554 #ifdef IMAP_UID /* not used */
556 #endif /* IMAP_UID */
561 static int imap_idle(int sock)
562 /* start an RFC2177 IDLE, or fake one if unsupported */
567 saved_timeout = mytimeout;
570 /* special timeout to terminate the IDLE and re-issue it
571 * at least every 28 minutes:
572 * (the server may have an inactivity timeout) */
573 mytimeout = 1680; /* 28 min */
574 /* enter IDLE mode */
575 ok = gen_transact(sock, "IDLE");
577 if (ok == PS_IDLETIMEOUT) {
578 /* send "DONE" continuation */
579 SockWrite(sock, "DONE\r\n", 6);
580 if (outlevel >= O_MONITOR)
581 report(stdout, "IMAP> DONE\n");
583 /* not idle timeout */
585 } else { /* no idle support, fake it */
586 /* when faking an idle, we can't assume the server will
587 * send us the new messages out of the blue (RFC2060);
588 * this timeout is potentially the delay before we notice
589 * new mail (can be small since NOOP checking is cheap) */
591 ok = gen_transact(sock, "NOOP");
592 /* if there's an error (not likely) or we just found mail (stage
593 * has changed, timeout has also been restored), we're done */
594 if (ok != 0 || stage != STAGE_IDLE)
597 /* wait (briefly) for an unsolicited status update */
598 ok = imap_ok(sock, NULL);
599 /* again, this is new mail or an error */
600 if (ok != PS_IDLETIMEOUT)
604 /* restore normal timeout value */
605 mytimeout = saved_timeout;
608 /* get OK IDLE message */
610 return imap_ok(sock, NULL);
615 static int imap_getrange(int sock,
618 int *countp, int *newp, int *bytes)
619 /* get range of messages to be fetched */
622 char buf[MSGBUFSIZE+1], *cp;
624 /* find out how many messages are waiting */
630 * We have to have an expunge here, otherwise the re-poll will
631 * infinite-loop picking up un-expunged messages -- unless the
632 * expunge period is one and we've been nuking each message
633 * just after deletion.
637 ok = internal_expunge(sock);
640 report(stderr, GT_("expunge failed\n"));
646 * recentcount is already set here by the last imap command which
647 * returned RECENT on detecting new mail. if recentcount is 0, wait
651 /* some servers do not report RECENT after an EXPUNGE. this check
652 * forces an incorrect recentcount to be ignored. */
653 if (recentcount > count)
655 /* this is a while loop because imap_idle() might return on other
656 * mailbox changes also */
657 while (recentcount == 0 && do_idle) {
659 ok = imap_idle(sock);
662 report(stderr, GT_("re-poll failed\n"));
666 /* if recentcount is 0, return no mail */
667 if (recentcount == 0)
669 if (outlevel >= O_DEBUG)
670 report(stdout, GT_("%d messages waiting after re-poll\n"), count);
675 ok = gen_transact(sock,
676 check_only ? "EXAMINE \"%s\"" : "SELECT \"%s\"",
677 folder ? folder : "INBOX");
680 report(stderr, GT_("mailbox selection failed\n"));
683 else if (outlevel >= O_DEBUG)
684 report(stdout, GT_("%d messages waiting after first poll\n"), count);
686 /* no messages? then we may need to idle until we get some */
687 while (count == 0 && do_idle) {
688 ok = imap_idle(sock);
691 report(stderr, GT_("re-poll failed\n"));
697 * We should have an expunge here to
698 * a) avoid fetching deleted mails during 'fetchall'
699 * b) getting a wrong count of mails during 'no fetchall'
701 if (!check_only && !ctl->keep && count > 0)
703 ok = internal_expunge(sock);
706 report(stderr, GT_("expunge failed\n"));
709 if (outlevel >= O_DEBUG)
710 report(stdout, GT_("%d messages waiting after expunge\n"), count);
718 /* OK, now get a count of unseen messages and their indices */
719 if (!ctl->fetchall && count > 0)
722 free(unseen_messages);
723 unseen_messages = xmalloc(count * sizeof(unsigned int));
724 memset(unseen_messages, 0, count * sizeof(unsigned int));
727 gen_send(sock, "SEARCH UNSEEN");
729 ok = gen_recv(sock, buf, sizeof(buf));
732 report(stderr, GT_("search for unseen messages failed\n"));
735 else if ((cp = strstr(buf, "* SEARCH")))
739 cp += 8; /* skip "* SEARCH" */
740 /* startcount is higher than count so that if there are no
741 * unseen messages, imap_getsizes() will not need to do
743 startcount = count + 1;
745 while (*cp && unseen < count)
747 /* skip whitespace */
748 while (*cp && isspace(*cp))
754 * Message numbers are between 1 and 2^32 inclusive,
755 * so unsigned int is large enough.
757 um=(unsigned int)strtol(cp,&ep,10);
760 unseen_messages[unseen++] = um;
761 if (outlevel >= O_DEBUG)
762 report(stdout, GT_("%u is unseen\n"), um);
771 (tag[0] != '\0' && strncmp(buf, tag, strlen(tag)));
773 if (outlevel >= O_DEBUG && unseen > 0)
774 report(stdout, GT_("%u is first unseen\n"), startcount);
786 static int imap_getsizes(int sock, int count, int *sizes)
787 /* capture the sizes of all messages */
789 char buf [MSGBUFSIZE+1];
792 * Some servers (as in, PMDF5.1-9.1 under OpenVMS 6.1)
793 * won't accept 1:1 as valid set syntax. Some implementors
794 * should be taken out and shot for excessive anality.
796 * Microsoft Exchange (brain-dead piece of crap that it is)
797 * sometimes gets its knickers in a knot about bodiless messages.
798 * You may see responses like this:
800 * fetchmail: IMAP> A0004 FETCH 1:9 RFC822.SIZE
801 * fetchmail: IMAP< * 2 FETCH (RFC822.SIZE 1187)
802 * fetchmail: IMAP< * 3 FETCH (RFC822.SIZE 3954)
803 * fetchmail: IMAP< * 4 FETCH (RFC822.SIZE 1944)
804 * fetchmail: IMAP< * 5 FETCH (RFC822.SIZE 2933)
805 * fetchmail: IMAP< * 6 FETCH (RFC822.SIZE 1854)
806 * fetchmail: IMAP< * 7 FETCH (RFC822.SIZE 34054)
807 * fetchmail: IMAP< * 8 FETCH (RFC822.SIZE 5561)
808 * fetchmail: IMAP< * 9 FETCH (RFC822.SIZE 1101)
809 * fetchmail: IMAP< A0004 NO The requested item could not be found.
811 * This means message 1 has only headers. For kicks and grins
812 * you can telnet in and look:
814 * A003 NO The requested item could not be found.
815 * A004 fetch 1 rfc822.header
816 * A004 NO The requested item could not be found.
818 * * 1 FETCH (BODY ("TEXT" "PLAIN" ("CHARSET" "US-ASCII") NIL NIL "7BIT" 35 3))
819 * A006 OK FETCH completed.
821 * To get around this, we terminate the read loop on a NO and count
822 * on the fact that the sizes array has been preinitialized with a
823 * known-bad size value.
825 /* if fetchall is specified, startcount is 1;
826 * else if there is new mail, startcount is first unseen message;
827 * else startcount is greater than count.
829 if (count == startcount)
830 gen_send(sock, "FETCH %d RFC822.SIZE", count);
831 else if (count > startcount)
832 gen_send(sock, "FETCH %d:%d RFC822.SIZE", startcount, count);
833 else /* no unseen messages! */
837 unsigned int num, size;
841 if ((ok = gen_recv(sock, buf, sizeof(buf))))
843 /* we want response matching to be case-insensitive */
844 for (cp = buf; *cp; cp++)
846 /* an untagged NO means that a message was not readable */
847 if (strstr(buf, "* NO"))
849 else if (strstr(buf, "OK") || strstr(buf, "NO"))
851 else if (sscanf(buf, "* %u FETCH (RFC822.SIZE %u)", &num, &size) == 2)
853 if (num > 0 && num <= count)
854 sizes[num - 1] = size;
856 report(stderr, "Warning: ignoring bogus data for message sizes returned by the server.\n");
863 static int imap_is_old(int sock, struct query *ctl, int number)
864 /* is the given message old? */
870 * Expunges change the fetch numbers, but unseen_messages contains
871 * indices from before any expungees were done. So neither the
872 * argument nor the values in message_sequence need to be decremented.
876 for (i = 0; i < unseen; i++)
877 if (unseen_messages[i] == number)
886 static char *skip_token(char *ptr)
888 while(isspace(*ptr)) ptr++;
889 while(!isspace(*ptr) && !iscntrl(*ptr)) ptr++;
890 while(isspace(*ptr)) ptr++;
894 static int imap_fetch_headers(int sock, struct query *ctl,int number,int *lenp)
895 /* request headers of nth message */
897 char buf [MSGBUFSIZE+1];
900 /* expunges change the fetch numbers */
904 * This is blessed by RFC1176, RFC1730, RFC2060.
905 * According to the RFCs, it should *not* set the \Seen flag.
907 gen_send(sock, "FETCH %d RFC822.HEADER", number);
909 /* looking for FETCH response */
915 if ((ok = gen_recv(sock, buf, sizeof(buf))))
917 ptr = skip_token(buf); /* either "* " or "AXXXX " */
918 if (sscanf(ptr, "%d FETCH (%*s {%d}", &num, lenp) == 2)
920 /* try to recover from chronically fucked-up M$ Exchange servers */
921 else if (!strncmp(ptr, "NO", 2))
923 /* wait for a tagged response */
924 if (strstr (buf, "* NO"))
926 return(PS_TRANSIENT);
928 else if (!strncmp(ptr, "BAD", 3))
930 /* wait for a tagged response */
931 if (strstr (buf, "* BAD"))
933 return(PS_TRANSIENT);
943 static int imap_fetch_body(int sock, struct query *ctl, int number, int *lenp)
944 /* request body of nth message */
946 char buf [MSGBUFSIZE+1], *cp;
949 /* expunges change the fetch numbers */
953 * If we're using IMAP4, we can fetch the message without setting its
954 * seen flag. This is good! It means that if the protocol exchange
955 * craps out during the message, it will still be marked `unseen' on
958 * According to RFC2060, and Mark Crispin the IMAP maintainer,
959 * FETCH %d BODY[TEXT] and RFC822.TEXT are "functionally
960 * equivalent". However, we know of at least one server that
961 * treats them differently in the presence of MIME attachments;
962 * the latter form downloads the attachment, the former does not.
963 * The server is InterChange, and the fool who implemented this
964 * misfeature ought to be strung up by his thumbs.
966 * When I tried working around this by disabling use of the 4rev1 form,
967 * I found that doing this breaks operation with M$ Exchange.
968 * Annoyingly enough, Exchange's refusal to cope is technically legal
969 * under RFC2062. Trust Microsoft, the Great Enemy of interoperability
970 * standards, to find a way to make standards compliance irritating....
972 switch (imap_version)
974 case IMAP4rev1: /* RFC 2060 */
975 gen_send(sock, "FETCH %d BODY.PEEK[TEXT]", number);
978 case IMAP4: /* RFC 1730 */
979 gen_send(sock, "FETCH %d RFC822.TEXT.PEEK", number);
982 default: /* RFC 1176 */
983 gen_send(sock, "FETCH %d RFC822.TEXT", number);
987 /* looking for FETCH response */
991 if ((ok = gen_recv(sock, buf, sizeof(buf))))
994 (!strstr(buf+4, "FETCH") || sscanf(buf+2, "%d", &num) != 1);
1000 * Try to extract a length from the FETCH response. RFC2060 requires
1001 * it to be present, but at least one IMAP server (Novell GroupWise)
1004 if ((cp = strchr(buf, '{')))
1005 *lenp = atoi(cp + 1);
1007 *lenp = -1; /* missing length part in FETCH reponse */
1012 static int imap_trail(int sock, struct query *ctl, int number)
1013 /* discard tail of FETCH response after reading message text */
1015 /* expunges change the fetch numbers */
1016 /* number -= expunged; */
1020 char buf[MSGBUFSIZE+1];
1023 if ((ok = gen_recv(sock, buf, sizeof(buf))))
1026 /* UW IMAP returns "OK FETCH", Cyrus returns "OK Completed" */
1027 if (strstr(buf, "OK"))
1034 static int imap_delete(int sock, struct query *ctl, int number)
1035 /* set delete flag for given message */
1039 /* expunges change the fetch numbers */
1043 * Use SILENT if possible as a minor throughput optimization.
1044 * Note: this has been dropped from IMAP4rev1.
1046 * We set Seen because there are some IMAP servers (notably HP
1047 * OpenMail) that do message-receipt DSNs, but only when the seen
1048 * bit is set. This is the appropriate time -- we get here right
1049 * after the local SMTP response that says delivery was
1052 if ((ok = gen_transact(sock,
1053 imap_version == IMAP4
1054 ? "STORE %d +FLAGS.SILENT (\\Seen \\Deleted)"
1055 : "STORE %d +FLAGS (\\Seen \\Deleted)",
1062 * We do an expunge after expunge_period messages, rather than
1063 * just before quit, so that a line hit during a long session
1064 * won't result in lots of messages being fetched again during
1067 if (NUM_NONZERO(expunge_period) && (deletions % expunge_period) == 0)
1068 internal_expunge(sock);
1073 static int imap_mark_seen(int sock, struct query *ctl, int number)
1074 /* mark the given message as seen */
1076 return(gen_transact(sock,
1077 imap_version == IMAP4
1078 ? "STORE %d +FLAGS.SILENT (\\Seen)"
1079 : "STORE %d +FLAGS (\\Seen)",
1083 static int imap_logout(int sock, struct query *ctl)
1084 /* send logout command */
1086 /* if any un-expunged deletions remain, ship an expunge now */
1088 internal_expunge(sock);
1091 /* Memory clean-up */
1092 if (unseen_messages)
1093 free(unseen_messages);
1094 #endif /* USE_SEARCH */
1096 return(gen_transact(sock, "LOGOUT"));
1099 const static struct method imap =
1101 "IMAP", /* Internet Message Access Protocol */
1105 #else /* INET6_ENABLE */
1106 143, /* standard IMAP2bis/IMAP4 port */
1107 993, /* ssl IMAP2bis/IMAP4 port */
1108 #endif /* INET6_ENABLE */
1109 TRUE, /* this is a tagged protocol */
1110 FALSE, /* no message delimiter */
1111 imap_ok, /* parse command response */
1112 imap_getauth, /* get authorization */
1113 imap_getrange, /* query range of messages */
1114 imap_getsizes, /* get sizes of messages (used for ESMTP SIZE option) */
1115 imap_is_old, /* no UID check */
1116 imap_fetch_headers, /* request given message headers */
1117 imap_fetch_body, /* request given message body */
1118 imap_trail, /* eat message trailer */
1119 imap_delete, /* delete the message */
1120 imap_mark_seen, /* how to mark a message as seen */
1121 imap_logout, /* expunge and exit */
1122 TRUE, /* yes, we can re-poll */
1125 int doIMAP(struct query *ctl)
1126 /* retrieve messages using IMAP Version 2bis or Version 4 */
1128 return(do_protocol(ctl, &imap));
1131 /* imap.c ends here */