2 // NNTP server module (RFC 3977)
4 // Copyright (c) 2014 by the citadel.org team
6 // This program is open source software; you can redistribute it and/or modify
7 // it under the terms of the GNU General Public License version 3.
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
24 #include <sys/types.h>
27 #if TIME_WITH_SYS_TIME
28 # include <sys/time.h>
32 # include <sys/time.h>
42 #include <sys/socket.h>
43 #include <netinet/in.h>
44 #include <arpa/inet.h>
45 #include <libcitadel.h>
48 #include "citserver.h"
56 #include "internet_addressing.h"
59 #include "clientsocket.h"
60 #include "locate_host.h"
61 #include "citadel_dirs.h"
62 #include "ctdl_module.h"
63 #include "serv_nntp.h"
67 // ***************** BEGIN UTILITY FUNCTIONS THAT COULD BE MOVED ELSEWHERE LATER **************
71 // Tests whether the supplied string is a valid newsgroup name
72 // Returns true (nonzero) or false (0)
74 int is_valid_newsgroup_name(char *name) {
79 if (!strncasecmp(name, "ctdl.", 5)) return(0);
83 if (isalpha(ptr[0])) {
87 if ( (isalnum(ptr[0]))
103 // Convert a Citadel room name to a valid newsgroup name
105 void room_to_newsgroup(char *target, char *source, size_t target_size) {
110 if (is_valid_newsgroup_name(source)) {
111 strncpy(target, source, target_size);
115 strcpy(target, "ctdl.");
120 while (ch=*ptr++, ch!=0) {
121 if (len >= target_size) return;
130 target[len++] = '+' ;
131 sprintf(&target[len], "%02x", ch);
140 // Convert a newsgroup name to a Citadel room name.
141 // This function recognizes names converted with room_to_newsgroup() and restores them with full fidelity.
143 void newsgroup_to_room(char *target, char *source, size_t target_size) {
148 if (strncasecmp(source, "ctdl.", 5)) { // not a converted room name; pass through as-is
149 strncpy(target, source, target_size);
155 char *ptr = &source[5];
158 while (ch=*ptr++, ch!=0) {
159 if (len >= target_size) return;
166 digit = strtol(hex, NULL, 16);
175 // ***************** END UTILITY FUNCTIONS THAT COULD BE MOVED ELSEWHERE LATER **************
180 // Here's where our NNTP session begins its happy day.
182 void nntp_greeting(void)
184 strcpy(CC->cs_clientname, "NNTP session");
185 CC->cs_flags |= CS_STEALTH;
187 CC->session_specific_data = malloc(sizeof(citnntp));
188 citnntp *nntpstate = (citnntp *) CC->session_specific_data;
189 memset(nntpstate, 0, sizeof(citnntp));
191 if (CC->nologin==1) {
192 cprintf("451 Too many connections are already open; please try again later.\r\n");
193 CC->kill_me = KILLME_MAX_SESSIONS_EXCEEDED;
197 // Display the standard greeting
198 cprintf("200 %s NNTP Citadel server is not finished yet\r\n", config.c_fqdn);
203 // NNTPS is just like NNTP, except it goes crypto right away.
205 void nntps_greeting(void) {
206 CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
208 if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO; /* kill session if no crypto */
215 // implements the STARTTLS command
217 void nntp_starttls(void)
219 char ok_response[SIZ];
220 char nosup_response[SIZ];
221 char error_response[SIZ];
223 sprintf(ok_response, "382 Begin TLS negotiation now\r\n");
224 sprintf(nosup_response, "502 Can not initiate TLS negotiation\r\n");
225 sprintf(error_response, "580 Internal error\r\n");
226 CtdlModuleStartCryptoMsgs(ok_response, nosup_response, error_response);
231 // Implements the CAPABILITY command
233 void nntp_capabilities(void)
235 cprintf("101 Capability list:\r\n");
236 cprintf("IMPLEMENTATION Citadel v%d.%02d\r\n", (REV_LEVEL/100), (REV_LEVEL%100));
237 cprintf("VERSION 2\r\n");
238 cprintf("READER\r\n");
239 cprintf("MODE-READER\r\n");
240 cprintf("LIST ACTIVE NEWSGROUPS\r\n");
243 cprintf("STARTTLS\r\n");
245 if (!CC->logged_in) {
246 cprintf("AUTHINFO USER\r\n");
253 // Implements the QUIT command
257 cprintf("221 Goodbye...\r\n");
258 CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
263 // Cleanup hook for this module
265 void nntp_cleanup(void)
267 /* nothing here yet */
272 // Implements the AUTHINFO USER command (RFC 4643)
274 void nntp_authinfo_user(const char *username)
276 int a = CtdlLoginExistingUser(NULL, username);
278 case login_already_logged_in:
279 cprintf("482 Already logged in\r\n");
281 case login_too_many_users:
282 cprintf("481 Too many users are already online (maximum is %d)\r\n", config.c_maxsessions);
285 cprintf("381 Password required for %s\r\n", CC->curr_user);
287 case login_not_found:
288 cprintf("481 %s not found\r\n", username);
291 cprintf("502 Internal error\r\n");
297 // Implements the AUTHINFO PASS command (RFC 4643)
299 void nntp_authinfo_pass(const char *buf)
303 a = CtdlTryPassword(buf, strlen(buf));
306 case pass_already_logged_in:
307 cprintf("482 Already logged in\r\n");
310 cprintf("482 Authentication commands issued out of sequence\r\n");
312 case pass_wrong_password:
313 cprintf("481 Authentication failed\r\n");
316 cprintf("281 Authentication accepted\r\n");
323 // Implements the AUTHINFO extension (RFC 4643) in USER/PASS mode
325 void nntp_authinfo(const char *cmd) {
327 if (!strncasecmp(cmd, "authinfo user ", 14)) {
328 nntp_authinfo_user(&cmd[14]);
331 else if (!strncasecmp(cmd, "authinfo pass ", 14)) {
332 nntp_authinfo_pass(&cmd[14]);
336 cprintf("502 command unavailable\r\n");
342 // Utility function to fetch the current list of message numbers in a room
344 struct nntp_msglist nntp_fetch_msglist(struct ctdlroom *qrbuf) {
345 struct nntp_msglist nm;
346 struct cdbdata *cdbfr;
348 cdbfr = cdb_fetch(CDB_MSGLISTS, &qrbuf->QRnumber, sizeof(long));
350 nm.msgnums = (long*)cdbfr->ptr;
352 nm.num_msgs = cdbfr->len / sizeof(long);
364 // Output a room name (newsgroup name) in formats required for LIST and NEWGROUPS command
366 void output_roomname_in_list_format(struct ctdlroom *qrbuf, int which_format, char *wildmat_pattern) {
368 struct nntp_msglist nm;
369 long low_water_mark = 0;
370 long high_water_mark = 0;
372 room_to_newsgroup(n_name, qrbuf->QRname, sizeof n_name);
374 if ((wildmat_pattern != NULL) && (!IsEmptyStr(wildmat_pattern))) {
375 if (!wildmat(n_name, wildmat_pattern)) {
380 nm = nntp_fetch_msglist(qrbuf);
381 if ((nm.num_msgs > 0) && (nm.msgnums != NULL)) {
382 low_water_mark = nm.msgnums[0];
383 high_water_mark = nm.msgnums[nm.num_msgs - 1];
386 // Only the mandatory formats are supported
387 switch(which_format) {
388 case NNTP_LIST_ACTIVE:
389 // FIXME we have hardcoded "n" for "no posting allowed" -- fix when we add posting
390 cprintf("%s %ld %ld n\r\n", n_name, high_water_mark, low_water_mark);
392 case NNTP_LIST_NEWSGROUPS:
393 cprintf("%s %s\r\n", n_name, qrbuf->QRname);
397 if (nm.msgnums != NULL) {
404 // Called once per room by nntp_newgroups() to qualify and possibly output a single room
406 void nntp_newgroups_backend(struct ctdlroom *qrbuf, void *data)
410 time_t thetime = *(time_t *)data;
412 CtdlRoomAccess(qrbuf, &CC->user, &ra, &view);
415 * The "created after <date/time>" heuristics depend on the happy coincidence
416 * that for a very long time we have used a unix timestamp as the room record's
417 * generation number (QRgen). When this module is merged into the master
418 * source tree we should rename QRgen to QR_create_time or something like that.
422 if (qrbuf->QRgen >= thetime) {
423 output_roomname_in_list_format(qrbuf, NNTP_LIST_ACTIVE, NULL);
430 // Implements the NEWGROUPS command
432 void nntp_newgroups(const char *cmd) {
433 if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
435 char stringy_date[16];
436 char stringy_time[16];
437 char stringy_gmt[16];
441 extract_token(stringy_date, cmd, 1, ' ', sizeof stringy_date);
442 extract_token(stringy_time, cmd, 2, ' ', sizeof stringy_time);
443 extract_token(stringy_gmt, cmd, 3, ' ', sizeof stringy_gmt);
445 memset(&tm, 0, sizeof tm);
446 if (strlen(stringy_date) == 6) {
447 sscanf(stringy_date, "%2d%2d%2d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
451 sscanf(stringy_date, "%4d%2d%2d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
454 tm.tm_mon -= 1; // tm_mon is zero based (0=January)
455 tm.tm_isdst = (-1); // let the C library figure out whether DST is in effect
456 sscanf(stringy_time, "%2d%2d%2d", &tm.tm_hour, &tm.tm_min ,&tm.tm_sec);
457 thetime = mktime(&tm);
458 if (!strcasecmp(stringy_gmt, "GMT")) {
464 cprintf("231 list of new newsgroups follows\r\n");
465 CtdlGetUser(&CC->user, CC->curr_user);
466 CtdlForEachRoom(nntp_newgroups_backend, &thetime);
472 // Called once per room by nntp_list() to qualify and possibly output a single room
474 void nntp_list_backend(struct ctdlroom *qrbuf, void *data)
478 struct nntp_list_data *nld = (struct nntp_list_data *)data;
480 CtdlRoomAccess(qrbuf, &CC->user, &ra, &view);
482 output_roomname_in_list_format(qrbuf, nld->list_format, nld->wildmat_pattern);
488 // Implements the LIST commands
490 void nntp_list(const char *cmd) {
491 if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
493 char list_format[64];
494 char wildmat_pattern[1024];
495 struct nntp_list_data nld;
497 extract_token(list_format, cmd, 1, ' ', sizeof list_format);
498 extract_token(wildmat_pattern, cmd, 2, ' ', sizeof wildmat_pattern);
500 if (strlen(wildmat_pattern) > 0) {
501 nld.wildmat_pattern = wildmat_pattern;
504 nld.wildmat_pattern = NULL;
507 if ( (strlen(cmd) < 6) || (!strcasecmp(list_format, "ACTIVE")) ) {
508 nld.list_format = NNTP_LIST_ACTIVE;
510 else if (!strcasecmp(list_format, "NEWSGROUPS")) {
511 nld.list_format = NNTP_LIST_NEWSGROUPS;
513 else if (!strcasecmp(list_format, "OVERVIEW.FMT")) {
514 nld.list_format = NNTP_LIST_OVERVIEW_FMT;
517 cprintf("501 syntax error , unsupported list format\r\n");
521 // OVERVIEW.FMT delivers a completely different type of data than all of the
522 // other LIST commands. It's a stupid place to put it. But that's how it's
523 // written into RFC3977, so we have to handle it here.
524 if (nld.list_format == NNTP_LIST_OVERVIEW_FMT) {
525 cprintf("215 Order of fields in overview database.\r\n");
526 cprintf("Subject:\r\n");
527 cprintf("From:\r\n");
528 cprintf("Date:\r\n");
529 cprintf("Message-ID:\r\n");
530 cprintf("References:\r\n");
531 cprintf(":bytes\r\n");
532 cprintf(":lines\r\n");
537 cprintf("215 list of newsgroups follows\r\n");
538 CtdlGetUser(&CC->user, CC->curr_user);
539 CtdlForEachRoom(nntp_list_backend, &nld);
545 // Implement HELP command.
547 void nntp_help(void) {
548 cprintf("100 This is the Citadel NNTP service.\r\n");
549 cprintf("RTFM http://www.ietf.org/rfc/rfc3977.txt\r\n");
555 // Implement DATE command.
557 void nntp_date(void) {
564 localtime_r(&now, &nowLocal);
565 gmtime_r(&now, &nowUtc);
567 strftime(tsFromUtc, sizeof(tsFromUtc), "%Y%m%d%H%M%S", &nowUtc);
569 cprintf("111 %s\r\n", tsFromUtc);
574 // back end for the LISTGROUP command , called for each message number
576 void nntp_listgroup_backend(long msgnum, void *userdata) {
578 struct listgroup_range *lr = (struct listgroup_range *)userdata;
580 // check range if supplied
581 if (msgnum < lr->lo) return;
582 if ((lr->hi != 0) && (msgnum > lr->hi)) return;
584 cprintf("%ld\r\n", msgnum);
589 // Implements the GROUP and LISTGROUP commands
591 void nntp_group(const char *cmd) {
592 if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
594 citnntp *nntpstate = (citnntp *) CC->session_specific_data;
596 char requested_group[1024];
597 char message_range[256];
600 char requested_room[ROOMNAMELEN];
601 char augmented_roomname[ROOMNAMELEN];
605 struct ctdlroom QRscratch;
608 struct listgroup_range lr;
610 extract_token(verb, cmd, 0, ' ', sizeof verb);
611 extract_token(requested_group, cmd, 1, ' ', sizeof requested_group);
612 extract_token(message_range, cmd, 2, ' ', sizeof message_range);
613 extract_token(range_lo, message_range, 0, '-', sizeof range_lo);
614 extract_token(range_hi, message_range, 1, '-', sizeof range_hi);
615 lr.lo = atoi(range_lo);
616 lr.hi = atoi(range_hi);
618 /* In LISTGROUP mode we can specify an empty name for 'currently selected' */
619 if ((!strcasecmp(verb, "LISTGROUP")) && (IsEmptyStr(requested_group))) {
620 room_to_newsgroup(requested_group, CC->room.QRname, sizeof requested_group);
623 /* First try a regular match */
624 newsgroup_to_room(requested_room, requested_group, sizeof requested_room);
625 c = CtdlGetRoom(&QRscratch, requested_room);
627 /* Then try a mailbox name match */
629 CtdlMailboxName(augmented_roomname, sizeof augmented_roomname, &CC->user, requested_room);
630 c = CtdlGetRoom(&QRscratch, augmented_roomname);
632 safestrncpy(requested_room, augmented_roomname, sizeof(requested_room));
636 /* If the room exists, check security/access */
638 /* See if there is an existing user/room relationship */
639 CtdlRoomAccess(&QRscratch, &CC->user, &ra, NULL);
641 /* normal clients have to pass through security */
647 /* Fail here if no such room */
649 cprintf("411 no such newsgroup\r\n");
655 * CtdlUserGoto() formally takes us to the desired room, happily returning
656 * the number of messages and number of new messages.
658 memcpy(&CC->room, &QRscratch, sizeof(struct ctdlroom));
659 CtdlUserGoto(NULL, 0, 0, &msgs, &new, &oldest, &newest);
660 cprintf("211 %d %ld %ld %s\r\n", msgs, oldest, newest, requested_group);
662 // If this is a GROUP command, set the "current article number" to zero, and then stop here.
663 if (!strcasecmp(verb, "GROUP")) {
664 nntpstate->current_article_number = oldest;
668 // If we get to this point we are running a LISTGROUP command. Fetch those message numbers.
669 CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL, nntp_listgroup_backend, &lr);
675 // Implements the MODE command
677 void nntp_mode(const char *cmd) {
681 extract_token(which_mode, cmd, 1, ' ', sizeof which_mode);
683 if (!strcasecmp(which_mode, "reader")) {
684 cprintf("201 Reader mode FIXME implement posting and change to 200\r\n");
687 cprintf("501 unknown mode\r\n");
693 // Implements the ARTICLE, HEAD, BODY, and STAT commands.
694 // (These commands all accept the same parameters; they differ only in how they output the retrieved message.)
696 void nntp_article(const char *cmd) {
697 if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
699 citnntp *nntpstate = (citnntp *) CC->session_specific_data;
700 char which_command[16];
702 char requested_article[256];
703 long requested_msgnum = 0;
704 char *lb, *rb = NULL;
705 int must_change_currently_selected_article = 0;
707 // We're going to store one of these values in the variable 'acmd' so that
708 // we can quickly check later which version of the output we want.
716 extract_token(which_command, cmd, 0, ' ', sizeof which_command);
718 if (!strcasecmp(which_command, "article")) {
721 else if (!strcasecmp(which_command, "head")) {
724 else if (!strcasecmp(which_command, "body")) {
727 else if (!strcasecmp(which_command, "stat")) {
731 cprintf("500 I'm afraid I can't do that.\r\n");
735 // Which NNTP command was issued, determines whether we will fetch headers, body, or both.
736 int headers_only = HEADERS_ALL;
737 if (acmd == HEAD) headers_only = HEADERS_FAST;
738 else if (acmd == BODY) headers_only = HEADERS_NONE;
739 else if (acmd == STAT) headers_only = HEADERS_FAST;
741 // now figure out what the client is asking for.
742 extract_token(requested_article, cmd, 1, ' ', sizeof requested_article);
743 lb = strchr(requested_article, '<');
744 rb = strchr(requested_article, '>');
745 requested_msgnum = atol(requested_article);
747 // If no article number or message-id is specified, the client wants the "currently selected article"
748 if (IsEmptyStr(requested_article)) {
749 if (nntpstate->current_article_number < 1) {
750 cprintf("420 No current article selected\r\n");
753 requested_msgnum = nntpstate->current_article_number;
754 must_change_currently_selected_article = 1;
755 // got it -- now fall through and keep going
758 // If the requested article is numeric, it maps directly to a message number. Good.
759 else if (requested_msgnum > 0) {
760 must_change_currently_selected_article = 1;
761 // good -- fall through and keep going
764 // If the requested article has angle brackets, the client wants a specific message-id.
765 // We don't know how to do that yet.
766 else if ( (lb != NULL) && (rb != NULL) && (lb < rb) ) {
767 must_change_currently_selected_article = 0;
768 cprintf("500 FIXME I don't know how to fetch by message-id yet.\r\n");
772 // Anything else is noncompliant gobbledygook and should die in a car fire.
774 must_change_currently_selected_article = 0;
775 cprintf("500 syntax error\r\n");
779 // At this point we know the message number of the "article" being requested.
780 // We have an awesome API call that does all the heavy lifting for us.
781 char *fetched_message_id = NULL;
782 CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
783 int fetch = CtdlOutputMsg(requested_msgnum,
784 MT_RFC822, // output in RFC822 format ... sort of
785 headers_only, // headers, body, or both?
786 0, // don't do Citadel protocol responses
788 NULL, // teh whole thing, not just a section
789 0, // no flags yet ... maybe new ones for Path: etc ?
792 &fetched_message_id // extract the message ID from the message as we go...
794 StrBuf *msgtext = CC->redirect_buffer;
795 CC->redirect_buffer = NULL;
797 if (fetch != om_ok) {
798 cprintf("423 no article with that number\r\n");
799 FreeStrBuf(&msgtext);
803 // RFC3977 6.2.1.2 specifes conditions under which the "currently selected article"
804 // MUST or MUST NOT be set to the message we just referenced.
805 if (must_change_currently_selected_article) {
806 nntpstate->current_article_number = requested_msgnum;
809 // Now give the client what it asked for.
810 if (acmd == ARTICLE) {
811 cprintf("220 %ld <%s>\r\n", requested_msgnum, fetched_message_id);
814 cprintf("221 %ld <%s>\r\n", requested_msgnum, fetched_message_id);
817 cprintf("222 %ld <%s>\r\n", requested_msgnum, fetched_message_id);
820 cprintf("223 %ld <%s>\r\n", requested_msgnum, fetched_message_id);
821 FreeStrBuf(&msgtext);
825 client_write(SKEY(msgtext));
826 cprintf(".\r\n"); // this protocol uses a dot terminator
827 FreeStrBuf(&msgtext);
828 if (fetched_message_id) free(fetched_message_id);
833 // Utility function for nntp_last_next() that turns a msgnum into a message ID.
834 // The memory for the returned string is pwnz0red by the caller.
836 char *message_id_from_msgnum(long msgnum) {
838 char *fetched_message_id = NULL;
839 CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
840 CtdlOutputMsg(msgnum,
841 MT_RFC822, // output in RFC822 format ... sort of
842 HEADERS_FAST, // headers, body, or both?
843 0, // don't do Citadel protocol responses
845 NULL, // teh whole thing, not just a section
846 0, // no flags yet ... maybe new ones for Path: etc ?
849 &fetched_message_id // extract the message ID from the message as we go...
851 StrBuf *msgtext = CC->redirect_buffer;
852 CC->redirect_buffer = NULL;
854 FreeStrBuf(&msgtext);
855 return(fetched_message_id);
860 // The LAST and NEXT commands are so similar that they are handled by a single function.
862 void nntp_last_next(const char *cmd) {
863 if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
865 citnntp *nntpstate = (citnntp *) CC->session_specific_data;
866 char which_command[16];
869 // We're going to store one of these values in the variable 'acmd' so that
870 // we can quickly check later which version of the output we want.
876 extract_token(which_command, cmd, 0, ' ', sizeof which_command);
878 if (!strcasecmp(which_command, "last")) {
881 else if (!strcasecmp(which_command, "next")) {
885 cprintf("500 I'm afraid I can't do that.\r\n");
889 // ok, here we go ... fetch the msglist so we can figure out our place in the universe
890 struct nntp_msglist nm;
892 long selected_msgnum = 0;
893 char *message_id = NULL;
895 nm = nntp_fetch_msglist(&CC->room);
896 if ((nm.num_msgs < 0) || (nm.msgnums == NULL)) {
897 cprintf("500 something bad happened\r\n");
901 if ( (acmd == NNTP_LAST) && (nm.num_msgs == 0) ) {
902 cprintf("422 no previous article in this group\r\n"); // nothing here
905 else if ( (acmd == NNTP_LAST) && (nntpstate->current_article_number <= nm.msgnums[0]) ) {
906 cprintf("422 no previous article in this group\r\n"); // already at the beginning
909 else if (acmd == NNTP_LAST) {
910 for (i=0; ((i<nm.num_msgs)&&(selected_msgnum<=0)); ++i) {
911 if ( (nm.msgnums[i] >= nntpstate->current_article_number) && (i > 0) ) {
912 selected_msgnum = nm.msgnums[i-1];
915 if (selected_msgnum > 0) {
916 nntpstate->current_article_number = selected_msgnum;
917 message_id = message_id_from_msgnum(nntpstate->current_article_number);
918 cprintf("223 %ld <%s>\r\n", nntpstate->current_article_number, message_id);
919 if (message_id) free(message_id);
922 cprintf("422 no previous article in this group\r\n");
926 else if ( (acmd == NNTP_NEXT) && (nm.num_msgs == 0) ) {
927 cprintf("421 no next article in this group\r\n"); // nothing here
930 else if ( (acmd == NNTP_NEXT) && (nntpstate->current_article_number >= nm.msgnums[nm.num_msgs-1]) ) {
931 cprintf("421 no next article in this group\r\n"); // already at the end
934 else if (acmd == NNTP_NEXT) {
935 for (i=0; ((i<nm.num_msgs)&&(selected_msgnum<=0)); ++i) {
936 if (nm.msgnums[i] > nntpstate->current_article_number) {
937 selected_msgnum = nm.msgnums[i];
940 if (selected_msgnum > 0) {
941 nntpstate->current_article_number = selected_msgnum;
942 message_id = message_id_from_msgnum(nntpstate->current_article_number);
943 cprintf("223 %ld <%s>\r\n", nntpstate->current_article_number, message_id);
944 if (message_id) free(message_id);
947 cprintf("421 no next article in this group\r\n");
951 // should never get here
953 cprintf("500 internal error\r\n");
956 if (nm.msgnums != NULL) {
964 // back end for the XOVER command , called for each message number
966 void nntp_xover_backend(long msgnum, void *userdata) {
968 struct listgroup_range *lr = (struct listgroup_range *)userdata;
970 // check range if supplied
971 if (msgnum < lr->lo) return;
972 if ((lr->hi != 0) && (msgnum > lr->hi)) return;
974 cprintf("FIXME %ld FIXME\r\n", msgnum); // FIXME need to actually show the overview data
980 // XOVER is used by some clients, even if we don't offer it
982 void nntp_xover(const char *cmd) {
983 if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
985 citnntp *nntpstate = (citnntp *) CC->session_specific_data;
987 struct listgroup_range lr;
989 extract_token(range, cmd, 1, ' ', sizeof range);
992 lr.lo = nntpstate->current_article_number;
993 lr.hi = nntpstate->current_article_number;
996 char *dash = strchr(range, '-');
1003 if (lr.hi < lr.lo) {
1012 cprintf("224 Overview information follows\r\n");
1013 CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL, nntp_xover_backend, &lr);
1019 // Main command loop for NNTP server sessions.
1021 void nntp_command_loop(void)
1023 StrBuf *Cmd = NewStrBuf();
1027 if (CtdlClientGetLine(Cmd) < 1) {
1028 syslog(LOG_CRIT, "NNTP: client disconnected: ending session.\n");
1029 CC->kill_me = KILLME_CLIENT_DISCONNECTED;
1033 syslog(LOG_DEBUG, "NNTP: %s\n", ((!strncasecmp(ChrPtr(Cmd), "AUTHINFO", 8)) ? "AUTHINFO ..." : ChrPtr(Cmd)));
1034 extract_token(cmdname, ChrPtr(Cmd), 0, ' ', sizeof cmdname);
1036 // Rumpelstiltskin lookups are *awesome*
1038 if (!strcasecmp(cmdname, "quit")) {
1042 else if (!strcasecmp(cmdname, "help")) {
1046 else if (!strcasecmp(cmdname, "date")) {
1050 else if (!strcasecmp(cmdname, "capabilities")) {
1051 nntp_capabilities();
1054 else if (!strcasecmp(cmdname, "starttls")) {
1058 else if (!strcasecmp(cmdname, "authinfo")) {
1059 nntp_authinfo(ChrPtr(Cmd));
1062 else if (!strcasecmp(cmdname, "newgroups")) {
1063 nntp_newgroups(ChrPtr(Cmd));
1066 else if (!strcasecmp(cmdname, "list")) {
1067 nntp_list(ChrPtr(Cmd));
1070 else if (!strcasecmp(cmdname, "group")) {
1071 nntp_group(ChrPtr(Cmd));
1074 else if (!strcasecmp(cmdname, "listgroup")) {
1075 nntp_group(ChrPtr(Cmd));
1078 else if (!strcasecmp(cmdname, "mode")) {
1079 nntp_mode(ChrPtr(Cmd));
1083 (!strcasecmp(cmdname, "article"))
1084 || (!strcasecmp(cmdname, "head"))
1085 || (!strcasecmp(cmdname, "body"))
1086 || (!strcasecmp(cmdname, "stat"))
1089 nntp_article(ChrPtr(Cmd));
1093 (!strcasecmp(cmdname, "last"))
1094 || (!strcasecmp(cmdname, "next"))
1097 nntp_last_next(ChrPtr(Cmd));
1101 (!strcasecmp(cmdname, "xover"))
1102 || (!strcasecmp(cmdname, "over"))
1105 nntp_xover(ChrPtr(Cmd));
1109 cprintf("500 I'm afraid I can't do that.\r\n");
1116 // ****************************************************************************
1117 // MODULE INITIALIZATION STUFF
1118 // ****************************************************************************
1122 // This cleanup function blows away the temporary memory used by
1125 void nntp_cleanup_function(void)
1127 /* Don't do this stuff if this is not an NNTP session! */
1128 if (CC->h_command_function != nntp_command_loop) return;
1130 syslog(LOG_DEBUG, "Performing NNTP cleanup hook\n");
1131 citnntp *nntpstate = (citnntp *) CC->session_specific_data;
1132 if (nntpstate != NULL) {
1138 const char *CitadelServiceNNTP="NNTP";
1140 CTDL_MODULE_INIT(nntp)
1144 CtdlRegisterServiceHook(119, // FIXME config.c_nntp_port,
1149 CitadelServiceNNTP);
1152 CtdlRegisterServiceHook(563, // FIXME config.c_nntps_port,
1157 CitadelServiceNNTP);
1160 CtdlRegisterCleanupHook(nntp_cleanup);
1161 CtdlRegisterSessionHook(nntp_cleanup_function, EVT_STOP, PRIO_STOP + 250);
1164 /* return our module name for the log */