2 * pop3.c -- POP3 protocol methods
4 * Copyright 1998 by Eric S. Raymond.
5 * For license terms, see the file COPYING in this directory.
13 #if defined(HAVE_UNISTD_H)
16 #if defined(STDC_HEADERS)
20 #include "fetchmail.h"
26 #endif /* OPIE_ENABLE */
32 #endif /* SDPS_ENABLE */
35 static char lastok[POPBUFSIZE+1];
36 #endif /* OPIE_ENABLE */
38 /* these variables are shared between the CAPA probe and the authenticator */
40 flag has_gssapi = FALSE;
41 #endif /* defined(GSSAPI) */
42 #if defined(KERBEROS_V4) || defined(KERBEROS_V5)
43 flag has_kerberos = FALSE;
44 #endif /* defined(KERBEROS_V4) || defined(KERBEROS_V5) */
45 static flag has_cram = FALSE;
48 #endif /* OPIE_ENABLE */
50 static flag has_ssl = FALSE;
51 #endif /* SSL_ENABLE */
56 static tSmbNtlmAuthRequest request;
57 static tSmbNtlmAuthChallenge challenge;
58 static tSmbNtlmAuthResponse response;
61 * NTLM support by Grant Edwards.
63 * Handle MS-Exchange NTLM authentication method. This is the same
64 * as the NTLM auth used by Samba for SMB related services. We just
65 * encode the packets in base64 instead of sending them out via a
68 * Much source (ntlm.h, smb*.c smb*.h) was borrowed from Samba.
71 static int do_pop3_ntlm(int sock, struct query *ctl)
76 gen_send(sock, "AUTH MSN");
78 if ((result = gen_recv(sock, msgbuf, sizeof msgbuf)))
84 buildSmbNtlmAuthRequest(&request,ctl->remotename,NULL);
86 if (outlevel >= O_DEBUG)
87 dumpSmbNtlmAuthRequest(stdout, &request);
89 memset(msgbuf,0,sizeof msgbuf);
90 to64frombits (msgbuf, (unsigned char*)&request, SmbLength(&request));
92 if (outlevel >= O_MONITOR)
93 report(stdout, "POP3> %s\n", msgbuf);
95 strcat(msgbuf,"\r\n");
96 SockWrite (sock, msgbuf, strlen (msgbuf));
98 if ((gen_recv(sock, msgbuf, sizeof msgbuf)))
101 len = from64tobits ((unsigned char*)&challenge, msgbuf, sizeof(msgbuf));
103 if (outlevel >= O_DEBUG)
104 dumpSmbNtlmAuthChallenge(stdout, &challenge);
106 buildSmbNtlmAuthResponse(&challenge, &response,ctl->remotename,ctl->password);
108 if (outlevel >= O_DEBUG)
109 dumpSmbNtlmAuthResponse(stdout, &response);
111 memset(msgbuf,0,sizeof msgbuf);
112 to64frombits (msgbuf, (unsigned char*)&response, SmbLength(&response));
114 if (outlevel >= O_MONITOR)
115 report(stdout, "POP3> %s\n", msgbuf);
117 strcat(msgbuf,"\r\n");
118 SockWrite (sock, msgbuf, strlen (msgbuf));
120 if ((result = gen_recv (sock, msgbuf, sizeof msgbuf)))
123 if (strstr (msgbuf, "OK"))
131 #define DOTLINE(s) (s[0] == '.' && (s[1]=='\r'||s[1]=='\n'||s[1]=='\0'))
133 static int pop3_ok (int sock, char *argbuf)
134 /* parse command response */
137 char buf [POPBUFSIZE+1];
140 if ((ok = gen_recv(sock, buf, sizeof(buf))) == 0)
142 if (*bufp == '+' || *bufp == '-')
147 while (isalpha((unsigned char)*bufp))
153 if (strcmp(buf,"+OK") == 0)
156 strcpy(lastok, bufp);
157 #endif /* OPIE_ENABLE */
160 else if (strncmp(buf,"-ERR", 4) == 0)
162 if (stage == STAGE_FETCH)
164 else if (stage > STAGE_GETAUTH)
167 * We're checking for "lock busy", "unable to lock",
168 * "already locked", "wait a few minutes" etc. here.
169 * This indicates that we have to wait for the server to
170 * unwedge itself before we can poll again.
172 * PS_LOCKBUSY check empirically verified with two recent
173 * versions of the Berkeley popper; QPOP (version 2.2) and
174 * QUALCOMM Pop server derived from UCB (version 2.1.4-R3)
175 * These are caught by the case-indifferent "lock" check.
176 * The "wait" catches "mail storage services unavailable,
177 * wait a few minutes and try again" on the InterMail server.
179 * If these aren't picked up on correctly, fetchmail will
180 * think there is an authentication failure and wedge the
181 * connection in order to prevent futile polls.
185 else if (strstr(bufp,"lock")
186 || strstr(bufp,"Lock")
187 || strstr(bufp,"LOCK")
188 || strstr(bufp,"wait")
189 /* these are blessed by RFC 2449 */
190 || strstr(bufp,"[IN-USE]")||strstr(bufp,"[LOGIN-DELAY]"))
192 else if ((strstr(bufp,"Service")
193 || strstr(bufp,"service"))
194 && (strstr(bufp,"unavailable")))
199 * We always want to pass the user lock-busy messages, because
200 * they're red flags. Other stuff (like AUTH failures on non-
201 * RFC1734 servers) only if we're debugging.
203 if (*bufp && (ok == PS_LOCKBUSY || outlevel >= O_MONITOR))
204 report(stderr, "%s\n", bufp);
218 static int capa_probe(int sock)
219 /* probe the capabilities of the remote server */
225 #endif /* defined(GSSAPI) */
226 #if defined(KERBEROS_V4) || defined(KERBEROS_V5)
227 has_kerberos = FALSE;
228 #endif /* defined(KERBEROS_V4) || defined(KERBEROS_V5) */
232 #endif /* OPIE_ENABLE */
234 ok = gen_transact(sock, "CAPA");
235 if (ok == PS_SUCCESS)
239 /* determine what authentication methods we have available */
240 while ((ok = gen_recv(sock, buffer, sizeof(buffer))) == 0)
245 if (strstr(buffer, "STLS"))
247 #endif /* SSL_ENABLE */
249 if (strstr(buffer, "GSSAPI"))
251 #endif /* defined(GSSAPI) */
252 #if defined(KERBEROS_V4)
253 if (strstr(buffer, "KERBEROS_V4"))
255 #endif /* defined(KERBEROS_V4) */
257 if (strstr(buffer, "X-OTP"))
259 #endif /* OPIE_ENABLE */
260 if (strstr(buffer, "CRAM-MD5"))
267 static int pop3_getauth(int sock, struct query *ctl, char *greeting)
268 /* apply for connection authorization */
275 #endif /* OPIE_ENABLE */
277 flag did_stls = FALSE;
278 #endif /* SSL_ENABLE */
282 #endif /* defined(GSSAPI) */
283 #if defined(KERBEROS_V4) || defined(KERBEROS_V5)
284 has_kerberos = FALSE;
285 #endif /* defined(KERBEROS_V4) || defined(KERBEROS_V5) */
289 #endif /* OPIE_ENABLE */
292 #endif /* SSL_ENABLE */
294 if (ctl->server.authenticate == A_SSH) {
300 * This needs to catch both demon.co.uk and demon.net.
301 * If we see either, and we're in multidrop mode, try to use
302 * the SDPS *ENV extension.
304 if (!(ctl->server.sdps) && MULTIDROP(ctl) && strstr(greeting, "demon."))
305 ctl->server.sdps = TRUE;
306 #endif /* SDPS_ENABLE */
308 /* MSN servers require the use of NTLM (MSN) authentication */
309 if (!strcasecmp(ctl->server.pollname, "pop3.email.msn.com") ||
310 ctl->server.authenticate == A_NTLM)
312 if (!do_pop3_ntlm(sock, ctl))
323 switch (ctl->server.protocol) {
326 /* CompuServe POP3 Servers as of 990730 want AUTH first for RPA */
327 if (strstr(ctl->remotename, "@compuserve.com"))
329 /* AUTH command should return a list of available mechanisms */
330 if (gen_transact(sock, "AUTH") == 0)
333 flag has_rpa = FALSE;
335 while ((ok = gen_recv(sock, buffer, sizeof(buffer))) == 0)
339 if (strncasecmp(buffer, "rpa", 3) == 0)
342 if (has_rpa && !POP3_auth_rpa(ctl->remotename,
343 ctl->password, sock))
349 #endif /* RPA_ENABLE */
352 * CAPA command may return a list including available
353 * authentication mechanisms. if it doesn't, no harm done, we
354 * just fall back to a plain login. Note that this code
355 * latches the server's authentication type, so that in daemon mode
356 * the CAPA check only needs to be done once at start of run.
358 * If CAPA fails, then force the authentication method to PASSORD
359 * and repoll immediately.
361 * These authentication methods are blessed by RFC1734,
362 * describing the POP3 AUTHentication command.
364 if ((ctl->server.authenticate == A_ANY) ||
365 (ctl->server.authenticate == A_GSSAPI) ||
366 (ctl->server.authenticate == A_KERBEROS_V4) ||
367 (ctl->server.authenticate == A_OTP) ||
368 (ctl->server.authenticate == A_CRAM_MD5))
370 if ((ok = capa_probe(sock)) != PS_SUCCESS)
371 /* we are in STAGE_GETAUTH! */
372 if (ok == PS_AUTHFAIL ||
373 /* Some servers directly close the socket. However, if we
374 * have already authenticated before, then a previous CAPA
375 * must have succeeded. In that case, treat this as a
376 * genuine socket error and do not change the auth method.
378 (ok == PS_SOCKET && !ctl->wehaveauthed))
380 ctl->server.authenticate = A_PASSWORD;
381 /* repoll immediately */
390 && (!ctl->sslproto || !strcmp(ctl->sslproto,"tls1")))
394 realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname;
395 ok = gen_transact(sock, "STLS");
397 /* We use "tls1" instead of ctl->sslproto, as we want STLS,
398 * not other SSL protocols
400 if (ok == PS_SUCCESS &&
401 SSLOpen(sock,ctl->sslcert,ctl->sslkey,"tls1",ctl->sslcertck, ctl->sslcertpath,ctl->sslfingerprint,realhost,ctl->server.pollname) == -1)
403 if (!ctl->sslproto && !ctl->wehaveauthed)
405 ctl->sslproto = xstrdup("");
406 /* repoll immediately */
410 GT_("SSL connection failed.\n"));
416 * RFC 2595 says this:
418 * "Once TLS has been started, the client MUST discard cached
419 * information about server capabilities and SHOULD re-issue the
420 * CAPABILITY command. This is necessary to protect against
421 * man-in-the-middle attacks which alter the capabilities list prior
422 * to STARTTLS. The server MAY advertise different capabilities
427 #endif /* SSL_ENABLE */
430 * OK, we have an authentication type now.
432 #if defined(KERBEROS_V4)
434 * Servers doing KPOP have to go through a dummy login sequence
435 * rather than doing SASL.
439 ctl->server.service && (strcmp(ctl->server.service, KPOP_PORT)!=0)
440 #else /* INET6_ENABLE */
441 ctl->server.port != KPOP_PORT
442 #endif /* INET6_ENABLE */
443 && (ctl->server.authenticate == A_KERBEROS_V4
444 || ctl->server.authenticate == A_KERBEROS_V5
445 || ctl->server.authenticate == A_ANY))
447 ok = do_rfc1731(sock, "AUTH", ctl->server.truename);
448 if (ok == PS_SUCCESS || ctl->server.authenticate != A_ANY)
451 #endif /* defined(KERBEROS_V4) || defined(KERBEROS_V5) */
455 (ctl->server.authenticate == A_GSSAPI ||
456 ctl->server.authenticate == A_ANY))
458 ok = do_gssauth(sock,"AUTH","pop",ctl->server.truename,ctl->remotename);
459 if (ok == PS_SUCCESS || ctl->server.authenticate != A_ANY)
462 #endif /* defined(GSSAPI) */
466 (ctl->server.authenticate == A_OTP ||
467 ctl->server.authenticate == A_ANY))
469 ok = do_otp(sock, "AUTH", ctl);
470 if (ok == PS_SUCCESS || ctl->server.authenticate != A_ANY)
473 #endif /* OPIE_ENABLE */
475 if (ctl->server.authenticate == A_CRAM_MD5 ||
476 (has_cram && ctl->server.authenticate == A_ANY))
478 ok = do_cram_md5(sock, "AUTH", ctl, NULL);
479 if (ok == PS_SUCCESS || ctl->server.authenticate != A_ANY)
483 /* ordinary validation, no one-time password or RPA */
484 gen_transact(sock, "USER %s", ctl->remotename);
487 /* see RFC1938: A One-Time Password System */
488 if ((challenge = strstr(lastok, "otp-"))) {
489 char response[OPIE_RESPONSE_MAX+1];
492 i = opiegenerator(challenge, !strcmp(ctl->password, "opie") ? "" : ctl->password, response);
493 if ((i == -2) && !run.poll_interval) {
494 char secret[OPIE_SECRET_MAX+1];
495 fprintf(stderr, GT_("Secret pass phrase: "));
496 if (opiereadpass(secret, sizeof(secret), 0))
497 i = opiegenerator(challenge, secret, response);
498 memset(secret, 0, sizeof(secret));
506 ok = gen_transact(sock, "PASS %s", response);
509 #endif /* OPIE_ENABLE */
511 strcpy(shroud, ctl->password);
512 ok = gen_transact(sock, "PASS %s", ctl->password);
515 /* this is for servers which claim to support TLS, but actually
517 if (did_stls && ok == PS_SOCKET && !ctl->sslproto && !ctl->wehaveauthed)
519 ctl->sslproto = xstrdup("");
520 /* repoll immediately */
527 /* build MD5 digest from greeting timestamp + password */
528 /* find start of timestamp */
529 for (start = greeting; *start != 0 && *start != '<'; start++)
533 GT_("Required APOP timestamp not found in greeting\n"));
537 /* find end of timestamp */
538 for (end = start; *end != 0 && *end != '>'; end++)
540 if (*end == 0 || end == start + 1) {
542 GT_("Timestamp syntax error in greeting\n"));
548 /* copy timestamp and password into digestion buffer */
549 xalloca(msg, char *, (end-start+1) + strlen(ctl->password) + 1);
551 strcat(msg,ctl->password);
553 strcpy(ctl->digest, MD5Digest((unsigned char *)msg));
555 ok = gen_transact(sock, "APOP %s %s", ctl->remotename, ctl->digest);
559 if ((ok = gen_transact(sock,"USER %s", ctl->remotename)) == 0)
560 ok = gen_transact(sock, "RPOP %s", ctl->password);
564 report(stderr, GT_("Undefined protocol request in POP3_auth\n"));
570 /* maybe we detected a lock-busy condition? */
571 if (ok == PS_LOCKBUSY)
572 report(stderr, GT_("lock busy! Is another session active?\n"));
577 /* Disable the sleep. Based on patch by Brian Candler 2004-04-19/2004-11-08,
578 * accepted by Matthias Andree.
580 * Rationale: the server must have locked the spool before returning +OK;
581 * this sleep just wastes time and hence, for modem and CSD users, money. */
584 * Empirical experience shows some server/OS combinations
585 * may need a brief pause even after any lockfiles on the
586 * server are released, to give the server time to finish
587 * copying back very large mailfolders from the temp-file...
588 * this is only ever an issue with extremely large mailboxes.
590 sleep(3); /* to be _really_ safe, probably need sleep(5)! */
593 /* we're peek-capable if use of TOP is enabled */
594 peek_capable = !(ctl->fetchall || (ctl->keep && !ctl->server.uidl));
600 static int pop3_gettopid( int sock, int num , char *id)
604 char buf [POPBUFSIZE+1];
605 snprintf(buf, sizeof(buf), "TOP %d 1", num);
606 if ((ok = gen_transact(sock, buf )) != 0)
609 while ((ok = gen_recv(sock, buf, sizeof(buf))) == 0)
613 if ( ! got_it && ! strncasecmp("Message-Id:", buf, 11 )) {
615 /* prevent stack overflows */
617 sscanf( buf+12, "%s", id);
623 static int pop3_getuidl( int sock, int num , char *id)
626 char buf [POPBUFSIZE+1];
627 gen_send(sock, "UIDL %d", num);
628 if ((ok = pop3_ok(sock, buf)) != 0)
630 if (sscanf(buf, "%d %s", &num, id) != 2)
635 static int pop3_fastuidl( int sock, struct query *ctl, unsigned int count, int *newp)
638 unsigned int first_nr, last_nr, try_nr;
643 while (first_nr < last_nr - 1)
647 try_nr = (first_nr + last_nr) / 2;
648 if( (ok = pop3_getuidl( sock, try_nr, id )) != 0 )
650 if ((new = str_in_list(&ctl->oldsaved, id, FALSE)))
652 flag mark = new->val.status.mark;
653 if (mark == UID_DELETED || mark == UID_EXPUNGED)
655 if (outlevel >= O_VERBOSE)
656 report(stderr, GT_("id=%s (num=%d) was deleted, but is still present!\n"), id, try_nr);
657 /* just mark it as seen now! */
658 new->val.status.mark = mark = UID_SEEN;
661 /* narrow the search region! */
662 if (mark == UID_UNSEEN)
664 if (outlevel >= O_DEBUG)
665 report(stdout, GT_("%u is unseen\n"), try_nr);
671 /* save the number */
672 new->val.status.num = try_nr;
676 if (outlevel >= O_DEBUG)
677 report(stdout, GT_("%u is unseen\n"), try_nr);
681 new = save_str(&ctl->oldsaved, id, UID_UNSEEN);
682 new->val.status.num = try_nr;
685 if (outlevel >= O_DEBUG && last_nr <= count)
686 report(stdout, GT_("%u is first unseen\n"), last_nr);
689 *newp = count - first_nr;
694 static int pop3_slowuidl( int sock, struct query *ctl, int *countp, int *newp)
696 /* This approach tries to get the message headers from the
697 * remote hosts and compares the message-id to the already known
699 * + if the first message containes a new id, all messages on
700 * the server will be new
701 * + if the first is known, try to estimate the last known message
702 * on the server and check. If this works you know the total number
703 * of messages to get.
704 * + Otherwise run a binary search to determine the last known message
706 int ok, nolinear = 0;
707 int first_nr, list_len, try_id, try_nr, add_id;
711 if( (ok = pop3_gettopid( sock, 1, id )) != 0 )
714 if( ( first_nr = str_nr_in_list(&ctl->oldsaved, id) ) == -1 ) {
715 /* the first message is unknown -> all messages are new */
720 /* check where we expect the latest known message */
721 list_len = count_list( &ctl->oldsaved );
722 try_id = list_len - first_nr; /* -1 + 1 */
724 if( try_id <= *countp ) {
725 if( (ok = pop3_gettopid( sock, try_id, id )) != 0 )
728 try_nr = str_nr_last_in_list(&ctl->oldsaved, id);
733 if( try_nr != list_len -1 ) {
734 /* some messages inbetween have been deleted... */
738 for( add_id = 1<<30; add_id > try_id-1; add_id >>= 1 )
740 for( ; add_id; add_id >>= 1 ) {
742 if( try_id - add_id <= 1 ) {
749 if( (ok = pop3_gettopid( sock, try_id, id )) != 0 )
751 try_nr = str_nr_in_list(&ctl->oldsaved, id);
758 GT_("Messages inserted into list on server. Cannot handle this.\n"));
763 /* the first try_id messages are known -> copy them to the newsaved list */
764 for( num = first_nr; num < list_len; num++ )
766 struct idlist *new = save_str(&ctl->newsaved,
767 str_from_nr_list(&ctl->oldsaved, num),
769 new->val.status.num = num - first_nr + 1;
773 free_str_list(&ctl->oldsaved);
778 *newp = *countp - try_id;
782 static int pop3_getrange(int sock,
785 int *countp, int *newp, int *bytes)
786 /* get range of messages to be fetched */
789 char buf [POPBUFSIZE+1];
791 /* Ensure that the new list is properly empty */
792 ctl->newsaved = (struct idlist *)NULL;
795 /* Alain Knaff suggests this, but it's not RFC standard */
797 if ((ok = gen_transact(sock, "MBOX %s", folder)))
801 /* get the total message count */
802 gen_send(sock, "STAT");
803 ok = pop3_ok(sock, buf);
805 sscanf(buf,"%d %d", countp, bytes);
810 * Newer, RFC-1725-conformant POP servers may not have the LAST command.
811 * We work as hard as possible to hide this ugliness, but it makes
812 * counting new messages intrinsically quadratic in the worst case.
816 if (*countp > 0 && !ctl->fetchall)
821 /* should we do fast uidl this time? */
822 fastuidl = ctl->fastuidl;
823 if (*countp > 7 && /* linear search is better if there are few mails! */
824 !ctl->flush && /* with flush, it is safer to disable fastuidl */
825 NUM_NONZERO (fastuidl))
830 dofastuidl = ctl->fastuidlcount != 0;
835 if (!ctl->server.uidl) {
836 gen_send(sock, "LAST");
837 ok = pop3_ok(sock, buf);
842 if (sscanf(buf, "%d", &last) == 0)
844 report(stderr, GT_("protocol error\n"));
847 *newp = (*countp - last);
852 return(pop3_fastuidl( sock, ctl, *countp, newp));
853 /* grab the mailbox's UID list */
854 if ((ok = gen_transact(sock, "UIDL")) != 0)
856 /* don't worry, yet! do it the slow way */
857 if((ok = pop3_slowuidl( sock, ctl, countp, newp))!=0)
859 report(stderr, GT_("protocol error while fetching UIDLs\n"));
868 while ((ok = gen_recv(sock, buf, sizeof(buf))) == 0)
872 else if (sscanf(buf, "%d %s", &num, id) == 2)
874 struct idlist *old, *new;
876 new = save_str(&ctl->newsaved, id, UID_UNSEEN);
877 new->val.status.num = num;
879 if ((old = str_in_list(&ctl->oldsaved, id, FALSE)))
881 flag mark = old->val.status.mark;
882 if (mark == UID_DELETED || mark == UID_EXPUNGED)
884 if (outlevel >= O_VERBOSE)
885 report(stderr, GT_("id=%s (num=%d) was deleted, but is still present!\n"), id, num);
886 /* just mark it as seen now! */
887 old->val.status.mark = mark = UID_SEEN;
889 new->val.status.mark = mark;
890 if (mark == UID_UNSEEN)
893 if (outlevel >= O_DEBUG)
894 report(stdout, GT_("%u is unseen\n"), num);
900 if (outlevel >= O_DEBUG)
901 report(stdout, GT_("%u is unseen\n"), num);
902 /* add it to oldsaved also! In case, we do not
903 * swap the lists (say, due to socket error),
904 * the same mail will not be downloaded again.
906 old = save_str(&ctl->oldsaved, id, UID_UNSEEN);
907 old->val.status.num = num;
918 static int pop3_getpartialsizes(int sock, int first, int last, int *sizes)
919 /* capture the size of message #first */
922 char buf [POPBUFSIZE+1];
923 unsigned int num, size;
925 for (i = first; i <= last; i++) {
926 gen_send(sock, "LIST %d", i);
927 if ((ok = pop3_ok(sock, buf)) != 0)
929 if (sscanf(buf, "%u %u", &num, &size) == 2) {
931 sizes[i - first] = size;
933 /* warn about possible attempt to induce buffer overrun
935 * we expect server reply message number and requested
936 * message number to match */
937 report(stderr, "Warning: ignoring bogus data for message sizes returned by server.\n");
943 static int pop3_getsizes(int sock, int count, int *sizes)
944 /* capture the sizes of all messages */
948 if ((ok = gen_transact(sock, "LIST")) != 0)
952 char buf [POPBUFSIZE+1];
954 while ((ok = gen_recv(sock, buf, sizeof(buf))) == 0)
956 unsigned int num, size;
960 else if (sscanf(buf, "%u %u", &num, &size) == 2) {
961 if (num > 0 && num <= count)
962 sizes[num - 1] = size;
964 /* warn about possible attempt to induce buffer overrun */
965 report(stderr, "Warning: ignoring bogus data for message sizes returned by server.\n");
973 static int pop3_is_old(int sock, struct query *ctl, int num)
974 /* is the given message old? */
978 return (num <= last);
986 /* in fast uidl, we manipulate the old list only! */
988 if ((new = id_find(&ctl->oldsaved, num)))
990 /* we already have the id! */
991 return(new->val.status.mark != UID_UNSEEN);
994 /* get the uidl first! */
995 if (pop3_getuidl(sock, num, id) != PS_SUCCESS)
998 if ((new = str_in_list(&ctl->oldsaved, id, FALSE))) {
999 /* we already have the id! */
1000 new->val.status.num = num;
1001 return(new->val.status.mark != UID_UNSEEN);
1005 new = save_str(&ctl->oldsaved, id, UID_UNSEEN);
1006 new->val.status.num = num;
1010 return ((new = id_find(&ctl->newsaved, num)) != NULL &&
1011 new->val.status.mark != UID_UNSEEN);
1016 * We could use this to fetch headers only as we do for IMAP. The trouble
1017 * is that there's no way to fetch the body only. So the following RETR
1018 * would have to re-fetch the header. Enough messages have longer headers
1019 * than bodies to make this a net loss.
1021 static int pop_fetch_headers(int sock, struct query *ctl,int number,int *lenp)
1022 /* request headers of nth message */
1025 char buf[POPBUFSIZE+1];
1027 gen_send(sock, "TOP %d 0", number);
1028 if ((ok = pop3_ok(sock, buf)) != 0)
1031 *lenp = -1; /* we got sizes from the LIST response */
1037 static int pop3_fetch(int sock, struct query *ctl, int number, int *lenp)
1038 /* request nth message */
1041 char buf[POPBUFSIZE+1];
1045 * See http://www.demon.net/services/mail/sdps-tech.html
1046 * for a description of what we're parsing here.
1048 if (ctl->server.sdps)
1052 sdps_envfrom = (char *)NULL;
1053 sdps_envto = (char *)NULL;
1054 gen_send(sock, "*ENV %d", number);
1056 if (gen_recv(sock, buf, sizeof(buf)))
1061 switch (linecount) {
1063 /* No need to wrap envelope from address */
1064 sdps_envfrom = xmalloc(strlen(buf)+1);
1065 strcpy(sdps_envfrom,buf);
1068 /* Wrap address with To: <> so nxtaddr() likes it */
1069 sdps_envto = xmalloc(strlen(buf)+7);
1070 sprintf(sdps_envto,"To: <%s>",buf);
1074 (!(buf[0] == '.' && (buf[1] == '\r' || buf[1] == '\n' || buf[1] == '\0')));
1076 #endif /* SDPS_ENABLE */
1079 * Though the POP RFCs don't document this fact, on almost every
1080 * POP3 server I know of messages are marked "seen" only at the
1081 * time the OK response to a RETR is issued.
1083 * This means we can use TOP to fetch the message without setting its
1084 * seen flag. This is good! It means that if the protocol exchange
1085 * craps out during the message, it will still be marked `unseen' on
1086 * the server. (Exception: in early 1999 SpryNet's POP3 servers were
1087 * reported to mark messages seen on a TOP fetch.)
1089 * However...*don't* do this if we're using keep to suppress deletion!
1090 * In that case, marking the seen flag is the only way to prevent the
1091 * message from being re-fetched on subsequent runs.
1093 * Also use RETR if fetchall is on. This gives us a workaround
1094 * for servers like usa.net's that bungle TOP. It's pretty
1095 * harmless because fetchall guarantees that any message dropped
1096 * by an interrupted RETR will be picked up on the next poll of the
1099 * We take advantage here of the fact that, according to all the
1100 * POP RFCs, "if the number of lines requested by the POP3 client
1101 * is greater than than the number of lines in the body, then the
1102 * POP3 server sends the entire message.").
1104 * The line count passed (99999999) is the maximum value CompuServe will
1105 * accept; it's much lower than the natural value 2147483646 (the maximum
1106 * twos-complement signed 32-bit integer minus 1) */
1108 gen_send(sock, "RETR %d", number);
1110 gen_send(sock, "TOP %d 99999999", number);
1111 if ((ok = pop3_ok(sock, buf)) != 0)
1114 *lenp = -1; /* we got sizes from the LIST response */
1119 static void mark_uid_seen(struct query *ctl, int number)
1120 /* Tell the UID code we've seen this. */
1124 if ((sdp = id_find(&ctl->newsaved, number)))
1125 sdp->val.status.mark = UID_SEEN;
1126 /* mark it as seen in oldsaved also! In case, we do not swap the lists
1127 * (say, due to socket error), the same mail will not be downloaded
1130 if ((sdp = id_find(&ctl->oldsaved, number)))
1131 sdp->val.status.mark = UID_SEEN;
1134 static int pop3_delete(int sock, struct query *ctl, int number)
1135 /* delete a given message */
1138 mark_uid_seen(ctl, number);
1139 /* actually, mark for deletion -- doesn't happen until QUIT time */
1140 ok = gen_transact(sock, "DELE %d", number);
1141 if (ok != PS_SUCCESS)
1143 delete_str(dofastuidl ? &ctl->oldsaved : &ctl->newsaved, number);
1147 static int pop3_mark_seen(int sock, struct query *ctl, int number)
1148 /* mark a given message as seen */
1150 mark_uid_seen(ctl, number);
1154 static int pop3_logout(int sock, struct query *ctl)
1155 /* send logout command */
1161 * We used to do this in case the server marks messages deleted when seen.
1162 * (Yes, this has been reported, in the MercuryP/NLM server.
1163 * It's even legal under RFC 1939 (section 8) as a site policy.)
1164 * It interacted badly with UIDL, though. Thomas Zajic wrote:
1165 * "Running 'fetchmail -F -v' and checking the logs, I found out
1166 * that fetchmail did in fact flush my mailbox properly, but sent
1167 * a RSET just before sending QUIT to log off. This caused the
1168 * POP3 server to undo/forget about the previous DELEs, resetting
1169 * my mailbox to its original (ie. unflushed) state. The
1170 * ~/.fetchids file did get flushed though, so the next time
1171 * fetchmail was run it saw all the old messages as new ones ..."
1174 gen_transact(sock, "RSET");
1175 #endif /* __UNUSED__ */
1177 ok = gen_transact(sock, "QUIT");
1184 static const struct method pop3 =
1186 "POP3", /* Post Office Protocol v3 */
1188 "pop3", /* standard POP3 port */
1189 "pop3s", /* ssl POP3 port */
1190 #else /* INET6_ENABLE */
1191 110, /* standard POP3 port */
1192 995, /* ssl POP3 port */
1193 #endif /* INET6_ENABLE */
1194 FALSE, /* this is not a tagged protocol */
1195 TRUE, /* this uses a message delimiter */
1196 pop3_ok, /* parse command response */
1197 pop3_getauth, /* get authorization */
1198 pop3_getrange, /* query range of messages */
1199 pop3_getsizes, /* we can get a list of sizes */
1200 pop3_getpartialsizes, /* we can get the size of 1 mail */
1201 pop3_is_old, /* how do we tell a message is old? */
1202 pop3_fetch, /* request given message */
1203 NULL, /* no way to fetch body alone */
1204 NULL, /* no message trailer */
1205 pop3_delete, /* how to delete a message */
1206 pop3_mark_seen, /* how to mark a message as seen */
1207 pop3_logout, /* log out, we're done */
1208 FALSE, /* no, we can't re-poll */
1211 int doPOP3 (struct query *ctl)
1212 /* retrieve messages using POP3 */
1215 if (ctl->mailboxes->id) {
1216 fprintf(stderr,GT_("Option --remote is not supported with POP3\n"));
1220 peek_capable = !ctl->fetchall;
1221 return(do_protocol(ctl, &pop3));
1223 #endif /* POP3_ENABLE */
1225 /* pop3.c ends here */