+++ /dev/null
-//
-// NNTP server module (RFC 3977)
-//
-// Copyright (c) 2014-2020 by the citadel.org team
-//
-// This program is open source software; you can redistribute it and/or modify
-// it under the terms of the GNU General Public License version 3.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-
-#include "sysdep.h"
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <termios.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <pwd.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <syslog.h>
-#include <time.h>
-#include <sys/wait.h>
-#include <ctype.h>
-#include <string.h>
-#include <limits.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <libcitadel.h>
-#include "citadel.h"
-#include "server.h"
-#include "citserver.h"
-#include "support.h"
-#include "config.h"
-#include "control.h"
-#include "user_ops.h"
-#include "room_ops.h"
-#include "database.h"
-#include "msgbase.h"
-#include "internet_addressing.h"
-#include "genstamp.h"
-#include "domain.h"
-#include "clientsocket.h"
-#include "locate_host.h"
-#include "citadel_dirs.h"
-#include "ctdl_module.h"
-#include "serv_nntp.h"
-
-#ifndef __FreeBSD__
-extern long timezone;
-#endif
-
-//
-// Tests whether the supplied string is a valid newsgroup name
-// Returns true (nonzero) or false (0)
-//
-int is_valid_newsgroup_name(char *name) {
- char *ptr = name;
- int has_a_letter = 0;
- int num_dots = 0;
-
- if (!ptr) return(0);
- if (!strncasecmp(name, "ctdl.", 5)) return(0);
-
- while (*ptr != 0) {
-
- if (isalpha(ptr[0])) {
- has_a_letter = 1;
- }
-
- if (ptr[0] == '.') {
- ++num_dots;
- }
-
- if ( (isalnum(ptr[0]))
- || (ptr[0] == '.')
- || (ptr[0] == '+')
- || (ptr[0] == '-')
- ) {
- ++ptr;
- }
- else {
- return(0);
- }
- }
- return( (has_a_letter) && (num_dots >= 1) ) ;
-}
-
-
-//
-// Convert a Citadel room name to a valid newsgroup name
-//
-void room_to_newsgroup(char *target, char *source, size_t target_size) {
-
- if (!target) return;
- if (!source) return;
-
- if (is_valid_newsgroup_name(source)) {
- strncpy(target, source, target_size);
- return;
- }
-
- strcpy(target, "ctdl.");
- int len = 5;
- char *ptr = source;
- char ch;
-
- while (ch=*ptr++, ch!=0) {
- if (len >= target_size) return;
- if ( (isalnum(ch))
- || (ch == '.')
- || (ch == '-')
- ) {
- target[len++] = tolower(ch);
- target[len] = 0;
- }
- else {
- target[len++] = '+' ;
- sprintf(&target[len], "%02x", ch);
- len += 2;
- target[len] = 0;
- }
- }
-}
-
-
-//
-// Convert a newsgroup name to a Citadel room name.
-// This function recognizes names converted with room_to_newsgroup() and restores them with full fidelity.
-//
-void newsgroup_to_room(char *target, char *source, size_t target_size) {
-
- if (!target) return;
- if (!source) return;
-
- if (strncasecmp(source, "ctdl.", 5)) { // not a converted room name; pass through as-is
- strncpy(target, source, target_size);
- return;
- }
-
- target[0] = 0;
- int len = 0;
- char *ptr = &source[5];
- char ch;
-
- while (ch=*ptr++, ch!=0) {
- if (len >= target_size) return;
- if (ch == '+') {
- char hex[3];
- long digit;
- hex[0] = *ptr++;
- hex[1] = *ptr++;
- hex[2] = 0;
- digit = strtol(hex, NULL, 16);
- ch = (char)digit;
- }
- target[len++] = ch;
- target[len] = 0;
- }
-}
-
-
-//
-// Here's where our NNTP session begins its happy day.
-//
-void nntp_greeting(void) {
- strcpy(CC->cs_clientname, "NNTP session");
- CC->cs_flags |= CS_STEALTH;
-
- CC->session_specific_data = malloc(sizeof(citnntp));
- citnntp *nntpstate = (citnntp *) CC->session_specific_data;
- memset(nntpstate, 0, sizeof(citnntp));
-
- if (CC->nologin==1) {
- cprintf("451 Too many connections are already open; please try again later.\r\n");
- CC->kill_me = KILLME_MAX_SESSIONS_EXCEEDED;
- return;
- }
-
- // Display the standard greeting
- cprintf("200 %s NNTP Citadel server is not finished yet\r\n", CtdlGetConfigStr("c_fqdn"));
-}
-
-
-//
-// NNTPS is just like NNTP, except it goes crypto right away.
-//
-void nntps_greeting(void) {
- CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
-#ifdef HAVE_OPENSSL
- if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO; /* kill session if no crypto */
-#endif
- nntp_greeting();
-}
-
-
-//
-// implements the STARTTLS command
-//
-void nntp_starttls(void) {
- char ok_response[SIZ];
- char nosup_response[SIZ];
- char error_response[SIZ];
-
- sprintf(ok_response, "382 Begin TLS negotiation now\r\n");
- sprintf(nosup_response, "502 Can not initiate TLS negotiation\r\n");
- sprintf(error_response, "580 Internal error\r\n");
- CtdlModuleStartCryptoMsgs(ok_response, nosup_response, error_response);
-}
-
-
-//
-// Implements the CAPABILITY command
-//
-void nntp_capabilities(void) {
- cprintf("101 Capability list:\r\n");
- cprintf("IMPLEMENTATION Citadel %d\r\n", REV_LEVEL);
- cprintf("VERSION 2\r\n");
- cprintf("READER\r\n");
- cprintf("MODE-READER\r\n");
- cprintf("LIST ACTIVE NEWSGROUPS\r\n");
- cprintf("OVER\r\n");
-#ifdef HAVE_OPENSSL
- cprintf("STARTTLS\r\n");
-#endif
- if (!CC->logged_in) {
- cprintf("AUTHINFO USER\r\n");
- }
- cprintf(".\r\n");
-}
-
-
-//
-// Implements the QUIT command
-//
-void nntp_quit(void) {
- cprintf("221 Goodbye...\r\n");
- CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
-}
-
-
-//
-// Implements the AUTHINFO USER command (RFC 4643)
-//
-void nntp_authinfo_user(const char *username) {
- int a = CtdlLoginExistingUser(username);
- switch (a) {
- case login_already_logged_in:
- cprintf("482 Already logged in\r\n");
- return;
- case login_too_many_users:
- cprintf("481 Too many users are already online (maximum is %d)\r\n", CtdlGetConfigInt("c_maxsessions"));
- return;
- case login_ok:
- cprintf("381 Password required for %s\r\n", CC->curr_user);
- return;
- case login_not_found:
- cprintf("481 %s not found\r\n", username);
- return;
- default:
- cprintf("502 Internal error\r\n");
- }
-}
-
-
-//
-// Implements the AUTHINFO PASS command (RFC 4643)
-//
-void nntp_authinfo_pass(const char *buf) {
- int a;
-
- a = CtdlTryPassword(buf, strlen(buf));
-
- switch (a) {
- case pass_already_logged_in:
- cprintf("482 Already logged in\r\n");
- return;
- case pass_no_user:
- cprintf("482 Authentication commands issued out of sequence\r\n");
- return;
- case pass_wrong_password:
- cprintf("481 Authentication failed\r\n");
- return;
- case pass_ok:
- cprintf("281 Authentication accepted\r\n");
- return;
- }
-}
-
-
-//
-// Implements the AUTHINFO extension (RFC 4643) in USER/PASS mode
-//
-void nntp_authinfo(const char *cmd) {
-
- if (!strncasecmp(cmd, "authinfo user ", 14)) {
- nntp_authinfo_user(&cmd[14]);
- }
-
- else if (!strncasecmp(cmd, "authinfo pass ", 14)) {
- nntp_authinfo_pass(&cmd[14]);
- }
-
- else {
- cprintf("502 command unavailable\r\n");
- }
-}
-
-
-//
-// Utility function to fetch the current list of message numbers in a room
-//
-struct nntp_msglist nntp_fetch_msglist(struct ctdlroom *qrbuf) {
- struct nntp_msglist nm;
- struct cdbdata *cdbfr;
-
- cdbfr = cdb_fetch(CDB_MSGLISTS, &qrbuf->QRnumber, sizeof(long));
- if (cdbfr != NULL) {
- nm.msgnums = (long*)cdbfr->ptr;
- cdbfr->ptr = NULL;
- nm.num_msgs = cdbfr->len / sizeof(long);
- cdbfr->len = 0;
- cdb_free(cdbfr);
- } else {
- nm.num_msgs = 0;
- nm.msgnums = NULL;
- }
- return(nm);
-}
-
-
-//
-// Output a room name (newsgroup name) in formats required for LIST and NEWGROUPS command
-//
-void output_roomname_in_list_format(struct ctdlroom *qrbuf, int which_format, char *wildmat_pattern) {
- char n_name[1024];
- struct nntp_msglist nm;
- long low_water_mark = 0;
- long high_water_mark = 0;
-
- room_to_newsgroup(n_name, qrbuf->QRname, sizeof n_name);
-
- if ((wildmat_pattern != NULL) && (!IsEmptyStr(wildmat_pattern))) {
- if (!wildmat(n_name, wildmat_pattern)) {
- return;
- }
- }
-
- nm = nntp_fetch_msglist(qrbuf);
- if ((nm.num_msgs > 0) && (nm.msgnums != NULL)) {
- low_water_mark = nm.msgnums[0];
- high_water_mark = nm.msgnums[nm.num_msgs - 1];
- }
-
- // Only the mandatory formats are supported
- switch(which_format) {
- case NNTP_LIST_ACTIVE:
- // FIXME we have hardcoded "n" for "no posting allowed" -- fix when we add posting
- cprintf("%s %ld %ld n\r\n", n_name, high_water_mark, low_water_mark);
- break;
- case NNTP_LIST_NEWSGROUPS:
- cprintf("%s %s\r\n", n_name, qrbuf->QRname);
- break;
- }
-
- if (nm.msgnums != NULL) {
- free(nm.msgnums);
- }
-}
-
-
-//
-// Called once per room by nntp_newgroups() to qualify and possibly output a single room
-//
-void nntp_newgroups_backend(struct ctdlroom *qrbuf, void *data) {
- int ra;
- int view;
- time_t thetime = *(time_t *)data;
-
- CtdlRoomAccess(qrbuf, &CC->user, &ra, &view);
-
- /*
- * The "created after <date/time>" heuristics depend on the happy coincidence
- * that for a very long time we have used a unix timestamp as the room record's
- * generation number (QRgen). When this module is merged into the master
- * source tree we should rename QRgen to QR_create_time or something like that.
- */
-
- if (ra & UA_KNOWN) {
- if (qrbuf->QRgen >= thetime) {
- output_roomname_in_list_format(qrbuf, NNTP_LIST_ACTIVE, NULL);
- }
- }
-}
-
-
-//
-// Implements the NEWGROUPS command
-//
-void nntp_newgroups(const char *cmd) {
- if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
-
- char stringy_date[16];
- char stringy_time[16];
- char stringy_gmt[16];
- struct tm tm;
- time_t thetime;
-
- extract_token(stringy_date, cmd, 1, ' ', sizeof stringy_date);
- extract_token(stringy_time, cmd, 2, ' ', sizeof stringy_time);
- extract_token(stringy_gmt, cmd, 3, ' ', sizeof stringy_gmt);
-
- memset(&tm, 0, sizeof tm);
- if (strlen(stringy_date) == 6) {
- sscanf(stringy_date, "%2d%2d%2d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
- tm.tm_year += 100;
- }
- else {
- sscanf(stringy_date, "%4d%2d%2d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
- tm.tm_year -= 1900;
- }
- tm.tm_mon -= 1; // tm_mon is zero based (0=January)
- tm.tm_isdst = (-1); // let the C library figure out whether DST is in effect
- sscanf(stringy_time, "%2d%2d%2d", &tm.tm_hour, &tm.tm_min ,&tm.tm_sec);
- thetime = mktime(&tm);
- if (!strcasecmp(stringy_gmt, "GMT")) {
- tzset();
-#ifdef __FreeBSD__
- thetime += &tm.tm_gmtoff;
-#else
- thetime += timezone;
-#endif
- }
-
-
- cprintf("231 list of new newsgroups follows\r\n");
- CtdlGetUser(&CC->user, CC->curr_user);
- CtdlForEachRoom(nntp_newgroups_backend, &thetime);
- cprintf(".\r\n");
-}
-
-
-//
-// Called once per room by nntp_list() to qualify and possibly output a single room
-//
-void nntp_list_backend(struct ctdlroom *qrbuf, void *data) {
- int ra;
- int view;
- struct nntp_list_data *nld = (struct nntp_list_data *)data;
-
- CtdlRoomAccess(qrbuf, &CC->user, &ra, &view);
- if (ra & UA_KNOWN) {
- output_roomname_in_list_format(qrbuf, nld->list_format, nld->wildmat_pattern);
- }
-}
-
-
-//
-// Implements the LIST commands
-//
-void nntp_list(const char *cmd) {
- if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
-
- char list_format[64];
- char wildmat_pattern[1024];
- struct nntp_list_data nld;
-
- extract_token(list_format, cmd, 1, ' ', sizeof list_format);
- extract_token(wildmat_pattern, cmd, 2, ' ', sizeof wildmat_pattern);
-
- if (strlen(wildmat_pattern) > 0) {
- nld.wildmat_pattern = wildmat_pattern;
- }
- else {
- nld.wildmat_pattern = NULL;
- }
-
- if ( (strlen(cmd) < 6) || (!strcasecmp(list_format, "ACTIVE")) ) {
- nld.list_format = NNTP_LIST_ACTIVE;
- }
- else if (!strcasecmp(list_format, "NEWSGROUPS")) {
- nld.list_format = NNTP_LIST_NEWSGROUPS;
- }
- else if (!strcasecmp(list_format, "OVERVIEW.FMT")) {
- nld.list_format = NNTP_LIST_OVERVIEW_FMT;
- }
- else {
- cprintf("501 syntax error , unsupported list format\r\n");
- return;
- }
-
- // OVERVIEW.FMT delivers a completely different type of data than all of the
- // other LIST commands. It's a stupid place to put it. But that's how it's
- // written into RFC3977, so we have to handle it here.
- if (nld.list_format == NNTP_LIST_OVERVIEW_FMT) {
- cprintf("215 Order of fields in overview database.\r\n");
- cprintf("Subject:\r\n");
- cprintf("From:\r\n");
- cprintf("Date:\r\n");
- cprintf("Message-ID:\r\n");
- cprintf("References:\r\n");
- cprintf("Bytes:\r\n");
- cprintf("Lines:\r\n");
- cprintf(".\r\n");
- return;
- }
-
- cprintf("215 list of newsgroups follows\r\n");
- CtdlGetUser(&CC->user, CC->curr_user);
- CtdlForEachRoom(nntp_list_backend, &nld);
- cprintf(".\r\n");
-}
-
-
-//
-// Implement HELP command.
-//
-void nntp_help(void) {
- cprintf("100 This is the Citadel NNTP service.\r\n");
- cprintf("RTFM http://www.ietf.org/rfc/rfc3977.txt\r\n");
- cprintf(".\r\n");
-}
-
-
-//
-// Implement DATE command.
-//
-void nntp_date(void) {
- time_t now;
- struct tm nowLocal;
- struct tm nowUtc;
- char tsFromUtc[32];
-
- now = time(NULL);
- localtime_r(&now, &nowLocal);
- gmtime_r(&now, &nowUtc);
-
- strftime(tsFromUtc, sizeof(tsFromUtc), "%Y%m%d%H%M%S", &nowUtc);
-
- cprintf("111 %s\r\n", tsFromUtc);
-}
-
-
-//
-// back end for the LISTGROUP command , called for each message number
-//
-void nntp_listgroup_backend(long msgnum, void *userdata) {
-
- struct listgroup_range *lr = (struct listgroup_range *)userdata;
-
- // check range if supplied
- if (msgnum < lr->lo) return;
- if ((lr->hi != 0) && (msgnum > lr->hi)) return;
-
- cprintf("%ld\r\n", msgnum);
-}
-
-
-//
-// Implements the GROUP and LISTGROUP commands
-//
-void nntp_group(const char *cmd) {
- if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
-
- citnntp *nntpstate = (citnntp *) CC->session_specific_data;
- char verb[16];
- char requested_group[1024];
- char message_range[256];
- char range_lo[256];
- char range_hi[256];
- char requested_room[ROOMNAMELEN];
- char augmented_roomname[ROOMNAMELEN];
- int c = 0;
- int ok = 0;
- int ra = 0;
- struct ctdlroom QRscratch;
- int msgs, new;
- long oldest,newest;
- struct listgroup_range lr;
-
- extract_token(verb, cmd, 0, ' ', sizeof verb);
- extract_token(requested_group, cmd, 1, ' ', sizeof requested_group);
- extract_token(message_range, cmd, 2, ' ', sizeof message_range);
- extract_token(range_lo, message_range, 0, '-', sizeof range_lo);
- extract_token(range_hi, message_range, 1, '-', sizeof range_hi);
- lr.lo = atoi(range_lo);
- lr.hi = atoi(range_hi);
-
- /* In LISTGROUP mode we can specify an empty name for 'currently selected' */
- if ((!strcasecmp(verb, "LISTGROUP")) && (IsEmptyStr(requested_group))) {
- room_to_newsgroup(requested_group, CC->room.QRname, sizeof requested_group);
- }
-
- /* First try a regular match */
- newsgroup_to_room(requested_room, requested_group, sizeof requested_room);
- c = CtdlGetRoom(&QRscratch, requested_room);
-
- /* Then try a mailbox name match */
- if (c != 0) {
- CtdlMailboxName(augmented_roomname, sizeof augmented_roomname, &CC->user, requested_room);
- c = CtdlGetRoom(&QRscratch, augmented_roomname);
- if (c == 0) {
- safestrncpy(requested_room, augmented_roomname, sizeof(requested_room));
- }
- }
-
- /* If the room exists, check security/access */
- if (c == 0) {
- /* See if there is an existing user/room relationship */
- CtdlRoomAccess(&QRscratch, &CC->user, &ra, NULL);
-
- /* normal clients have to pass through security */
- if (ra & UA_KNOWN) {
- ok = 1;
- }
- }
-
- /* Fail here if no such room */
- if (!ok) {
- cprintf("411 no such newsgroup\r\n");
- return;
- }
-
-
- /*
- * CtdlUserGoto() formally takes us to the desired room, happily returning
- * the number of messages and number of new messages.
- */
- memcpy(&CC->room, &QRscratch, sizeof(struct ctdlroom));
- CtdlUserGoto(NULL, 0, 0, &msgs, &new, &oldest, &newest);
- cprintf("211 %d %ld %ld %s\r\n", msgs, oldest, newest, requested_group);
-
- // If this is a GROUP command, set the "current article number" to zero, and then stop here.
- if (!strcasecmp(verb, "GROUP")) {
- nntpstate->current_article_number = oldest;
- return;
- }
-
- // If we get to this point we are running a LISTGROUP command. Fetch those message numbers.
- CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL, nntp_listgroup_backend, &lr);
- cprintf(".\r\n");
-}
-
-
-//
-// Implements the MODE command
-//
-void nntp_mode(const char *cmd) {
-
- char which_mode[16];
-
- extract_token(which_mode, cmd, 1, ' ', sizeof which_mode);
-
- if (!strcasecmp(which_mode, "reader")) {
- // FIXME implement posting and change to 200
- cprintf("201 Reader mode activated\r\n");
- }
- else {
- cprintf("501 unknown mode\r\n");
- }
-}
-
-
-//
-// Implements the ARTICLE, HEAD, BODY, and STAT commands.
-// (These commands all accept the same parameters; they differ only in how they output the retrieved message.)
-//
-void nntp_article(const char *cmd) {
- if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
-
- citnntp *nntpstate = (citnntp *) CC->session_specific_data;
- char which_command[16];
- int acmd = 0;
- char requested_article[256];
- long requested_msgnum = 0;
- char *lb, *rb = NULL;
- int must_change_currently_selected_article = 0;
-
- // We're going to store one of these values in the variable 'acmd' so that
- // we can quickly check later which version of the output we want.
- enum {
- ARTICLE,
- HEAD,
- BODY,
- STAT
- };
-
- extract_token(which_command, cmd, 0, ' ', sizeof which_command);
-
- if (!strcasecmp(which_command, "article")) {
- acmd = ARTICLE;
- }
- else if (!strcasecmp(which_command, "head")) {
- acmd = HEAD;
- }
- else if (!strcasecmp(which_command, "body")) {
- acmd = BODY;
- }
- else if (!strcasecmp(which_command, "stat")) {
- acmd = STAT;
- }
- else {
- cprintf("500 I'm afraid I can't do that.\r\n");
- return;
- }
-
- // Which NNTP command was issued, determines whether we will fetch headers, body, or both.
- int headers_only = HEADERS_ALL;
- if (acmd == HEAD) headers_only = HEADERS_FAST;
- else if (acmd == BODY) headers_only = HEADERS_NONE;
- else if (acmd == STAT) headers_only = HEADERS_FAST;
-
- // now figure out what the client is asking for.
- extract_token(requested_article, cmd, 1, ' ', sizeof requested_article);
- lb = strchr(requested_article, '<');
- rb = strchr(requested_article, '>');
- requested_msgnum = atol(requested_article);
-
- // If no article number or message-id is specified, the client wants the "currently selected article"
- if (IsEmptyStr(requested_article)) {
- if (nntpstate->current_article_number < 1) {
- cprintf("420 No current article selected\r\n");
- return;
- }
- requested_msgnum = nntpstate->current_article_number;
- must_change_currently_selected_article = 1;
- // got it -- now fall through and keep going
- }
-
- // If the requested article is numeric, it maps directly to a message number. Good.
- else if (requested_msgnum > 0) {
- must_change_currently_selected_article = 1;
- // good -- fall through and keep going
- }
-
- // If the requested article has angle brackets, the client wants a specific message-id.
- // We don't know how to do that yet.
- else if ( (lb != NULL) && (rb != NULL) && (lb < rb) ) {
- must_change_currently_selected_article = 0;
- cprintf("500 I don't know how to fetch by message-id yet.\r\n"); // FIXME
- return;
- }
-
- // Anything else is noncompliant gobbledygook and should die in a car fire.
- else {
- must_change_currently_selected_article = 0;
- cprintf("500 syntax error\r\n");
- return;
- }
-
- // At this point we know the message number of the "article" being requested.
- // We have an awesome API call that does all the heavy lifting for us.
- char *fetched_message_id = NULL;
- CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
- int fetch = CtdlOutputMsg(requested_msgnum,
- MT_RFC822, // output in RFC822 format ... sort of
- headers_only, // headers, body, or both?
- 0, // don't do Citadel protocol responses
- 1, // CRLF newlines
- NULL, // teh whole thing, not just a section
- 0, // no flags yet ... maybe new ones for Path: etc ?
- NULL,
- NULL,
- &fetched_message_id // extract the message ID from the message as we go...
- );
- StrBuf *msgtext = CC->redirect_buffer;
- CC->redirect_buffer = NULL;
-
- if (fetch != om_ok) {
- cprintf("423 no article with that number\r\n");
- FreeStrBuf(&msgtext);
- return;
- }
-
- // RFC3977 6.2.1.2 specifes conditions under which the "currently selected article"
- // MUST or MUST NOT be set to the message we just referenced.
- if (must_change_currently_selected_article) {
- nntpstate->current_article_number = requested_msgnum;
- }
-
- // Now give the client what it asked for.
- if (acmd == ARTICLE) {
- cprintf("220 %ld <%s>\r\n", requested_msgnum, fetched_message_id);
- }
- if (acmd == HEAD) {
- cprintf("221 %ld <%s>\r\n", requested_msgnum, fetched_message_id);
- }
- if (acmd == BODY) {
- cprintf("222 %ld <%s>\r\n", requested_msgnum, fetched_message_id);
- }
- if (acmd == STAT) {
- cprintf("223 %ld <%s>\r\n", requested_msgnum, fetched_message_id);
- FreeStrBuf(&msgtext);
- return;
- }
-
- client_write(SKEY(msgtext));
- cprintf(".\r\n"); // this protocol uses a dot terminator
- FreeStrBuf(&msgtext);
- if (fetched_message_id) free(fetched_message_id);
-}
-
-
-//
-// Utility function for nntp_last_next() that turns a msgnum into a message ID.
-// The memory for the returned string is pwnz0red by the caller.
-//
-char *message_id_from_msgnum(long msgnum) {
- char *fetched_message_id = NULL;
- CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
- CtdlOutputMsg(msgnum,
- MT_RFC822, // output in RFC822 format ... sort of
- HEADERS_FAST, // headers, body, or both?
- 0, // don't do Citadel protocol responses
- 1, // CRLF newlines
- NULL, // teh whole thing, not just a section
- 0, // no flags yet ... maybe new ones for Path: etc ?
- NULL,
- NULL,
- &fetched_message_id // extract the message ID from the message as we go...
- );
- StrBuf *msgtext = CC->redirect_buffer;
- CC->redirect_buffer = NULL;
-
- FreeStrBuf(&msgtext);
- return(fetched_message_id);
-}
-
-
-//
-// The LAST and NEXT commands are so similar that they are handled by a single function.
-//
-void nntp_last_next(const char *cmd) {
- if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
-
- citnntp *nntpstate = (citnntp *) CC->session_specific_data;
- char which_command[16];
- int acmd = 0;
-
- // We're going to store one of these values in the variable 'acmd' so that
- // we can quickly check later which version of the output we want.
- enum {
- NNTP_LAST,
- NNTP_NEXT
- };
-
- extract_token(which_command, cmd, 0, ' ', sizeof which_command);
-
- if (!strcasecmp(which_command, "last")) {
- acmd = NNTP_LAST;
- }
- else if (!strcasecmp(which_command, "next")) {
- acmd = NNTP_NEXT;
- }
- else {
- cprintf("500 I'm afraid I can't do that.\r\n");
- return;
- }
-
- // ok, here we go ... fetch the msglist so we can figure out our place in the universe
- struct nntp_msglist nm;
- int i = 0;
- long selected_msgnum = 0;
- char *message_id = NULL;
-
- nm = nntp_fetch_msglist(&CC->room);
- if ((nm.num_msgs < 0) || (nm.msgnums == NULL)) {
- cprintf("500 something bad happened\r\n");
- return;
- }
-
- if ( (acmd == NNTP_LAST) && (nm.num_msgs == 0) ) {
- cprintf("422 no previous article in this group\r\n"); // nothing here
- }
-
- else if ( (acmd == NNTP_LAST) && (nntpstate->current_article_number <= nm.msgnums[0]) ) {
- cprintf("422 no previous article in this group\r\n"); // already at the beginning
- }
-
- else if (acmd == NNTP_LAST) {
- for (i=0; ((i<nm.num_msgs)&&(selected_msgnum<=0)); ++i) {
- if ( (nm.msgnums[i] >= nntpstate->current_article_number) && (i > 0) ) {
- selected_msgnum = nm.msgnums[i-1];
- }
- }
- if (selected_msgnum > 0) {
- nntpstate->current_article_number = selected_msgnum;
- message_id = message_id_from_msgnum(nntpstate->current_article_number);
- cprintf("223 %ld <%s>\r\n", nntpstate->current_article_number, message_id);
- if (message_id) free(message_id);
- }
- else {
- cprintf("422 no previous article in this group\r\n");
- }
- }
-
- else if ( (acmd == NNTP_NEXT) && (nm.num_msgs == 0) ) {
- cprintf("421 no next article in this group\r\n"); // nothing here
- }
-
- else if ( (acmd == NNTP_NEXT) && (nntpstate->current_article_number >= nm.msgnums[nm.num_msgs-1]) ) {
- cprintf("421 no next article in this group\r\n"); // already at the end
- }
-
- else if (acmd == NNTP_NEXT) {
- for (i=0; ((i<nm.num_msgs)&&(selected_msgnum<=0)); ++i) {
- if (nm.msgnums[i] > nntpstate->current_article_number) {
- selected_msgnum = nm.msgnums[i];
- }
- }
- if (selected_msgnum > 0) {
- nntpstate->current_article_number = selected_msgnum;
- message_id = message_id_from_msgnum(nntpstate->current_article_number);
- cprintf("223 %ld <%s>\r\n", nntpstate->current_article_number, message_id);
- if (message_id) free(message_id);
- }
- else {
- cprintf("421 no next article in this group\r\n");
- }
- }
-
- // should never get here
- else {
- cprintf("500 internal error\r\n");
- }
-
- if (nm.msgnums != NULL) {
- free(nm.msgnums);
- }
-
-}
-
-
-//
-// back end for the XOVER command , called for each message number
-//
-void nntp_xover_backend(long msgnum, void *userdata) {
-
- struct listgroup_range *lr = (struct listgroup_range *)userdata;
-
- // check range if supplied
- if (msgnum < lr->lo) return;
- if ((lr->hi != 0) && (msgnum > lr->hi)) return;
-
- struct CtdlMessage *msg = CtdlFetchMessage(msgnum, 0);
- if (msg == NULL) {
- return;
- }
-
- // Teh RFC says we need:
- // -------------------------
- // Subject header content
- // From header content
- // Date header content
- // Message-ID header content
- // References header content
- // :bytes metadata item
- // :lines metadata item
-
- time_t msgtime = atol(msg->cm_fields[eTimestamp]);
- char strtimebuf[26];
- ctime_r(&msgtime, strtimebuf);
-
- // here we go -- print the line o'data
- cprintf("%ld\t%s\t%s <%s>\t%s\t%s\t%s\t100\t10\r\n",
- msgnum,
- msg->cm_fields[eMsgSubject],
- msg->cm_fields[eAuthor],
- msg->cm_fields[erFc822Addr],
- strtimebuf,
- msg->cm_fields[emessageId],
- msg->cm_fields[eWeferences]
- );
-
- CM_Free(msg);
-}
-
-
-//
-//
-// XOVER is used by some clients, even if we don't offer it
-//
-void nntp_xover(const char *cmd) {
- if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
-
- citnntp *nntpstate = (citnntp *) CC->session_specific_data;
- char range[256];
- struct listgroup_range lr;
-
- extract_token(range, cmd, 1, ' ', sizeof range);
- lr.lo = atol(range);
- if (lr.lo <= 0) {
- lr.lo = nntpstate->current_article_number;
- lr.hi = nntpstate->current_article_number;
- }
- else {
- char *dash = strchr(range, '-');
- if (dash != NULL) {
- ++dash;
- lr.hi = atol(dash);
- if (lr.hi == 0) {
- lr.hi = LONG_MAX;
- }
- if (lr.hi < lr.lo) {
- lr.hi = lr.lo;
- }
- }
- else {
- lr.hi = lr.lo;
- }
- }
-
- cprintf("224 Overview information follows\r\n");
- CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL, nntp_xover_backend, &lr);
- cprintf(".\r\n");
-}
-
-
-//
-// Main command loop for NNTP server sessions.
-//
-void nntp_command_loop(void) {
- StrBuf *Cmd = NewStrBuf();
- char cmdname[16];
-
- time(&CC->lastcmd);
- if (CtdlClientGetLine(Cmd) < 1) {
- syslog(LOG_CRIT, "NNTP: client disconnected: ending session.\n");
- CC->kill_me = KILLME_CLIENT_DISCONNECTED;
- FreeStrBuf(&Cmd);
- return;
- }
- syslog(LOG_DEBUG, "NNTP: %s\n", ((!strncasecmp(ChrPtr(Cmd), "AUTHINFO", 8)) ? "AUTHINFO ..." : ChrPtr(Cmd)));
- extract_token(cmdname, ChrPtr(Cmd), 0, ' ', sizeof cmdname);
-
- // Rumpelstiltskin lookups are *awesome*
-
- if (!strcasecmp(cmdname, "quit")) {
- nntp_quit();
- }
-
- else if (!strcasecmp(cmdname, "help")) {
- nntp_help();
- }
-
- else if (!strcasecmp(cmdname, "date")) {
- nntp_date();
- }
-
- else if (!strcasecmp(cmdname, "capabilities")) {
- nntp_capabilities();
- }
-
- else if (!strcasecmp(cmdname, "starttls")) {
- nntp_starttls();
- }
-
- else if (!strcasecmp(cmdname, "authinfo")) {
- nntp_authinfo(ChrPtr(Cmd));
- }
-
- else if (!strcasecmp(cmdname, "newgroups")) {
- nntp_newgroups(ChrPtr(Cmd));
- }
-
- else if (!strcasecmp(cmdname, "list")) {
- nntp_list(ChrPtr(Cmd));
- }
-
- else if (!strcasecmp(cmdname, "group")) {
- nntp_group(ChrPtr(Cmd));
- }
-
- else if (!strcasecmp(cmdname, "listgroup")) {
- nntp_group(ChrPtr(Cmd));
- }
-
- else if (!strcasecmp(cmdname, "mode")) {
- nntp_mode(ChrPtr(Cmd));
- }
-
- else if (
- (!strcasecmp(cmdname, "article"))
- || (!strcasecmp(cmdname, "head"))
- || (!strcasecmp(cmdname, "body"))
- || (!strcasecmp(cmdname, "stat"))
- )
- {
- nntp_article(ChrPtr(Cmd));
- }
-
- else if (
- (!strcasecmp(cmdname, "last"))
- || (!strcasecmp(cmdname, "next"))
- )
- {
- nntp_last_next(ChrPtr(Cmd));
- }
-
- else if (
- (!strcasecmp(cmdname, "xover"))
- || (!strcasecmp(cmdname, "over"))
- )
- {
- nntp_xover(ChrPtr(Cmd));
- }
-
- else {
- cprintf("500 I'm afraid I can't do that.\r\n");
- }
-
- FreeStrBuf(&Cmd);
-}
-
-
-// ****************************************************************************
-// MODULE INITIALIZATION STUFF
-// ****************************************************************************
-
-
-//
-// This cleanup function blows away the temporary memory used by
-// the NNTP server.
-//
-void nntp_cleanup_function(void) {
- /* Don't do this stuff if this is not an NNTP session! */
- if (CC->h_command_function != nntp_command_loop) return;
-
- syslog(LOG_DEBUG, "Performing NNTP cleanup hook\n");
- citnntp *nntpstate = (citnntp *) CC->session_specific_data;
- if (nntpstate != NULL) {
- free(nntpstate);
- nntpstate = NULL;
- }
-}
-
-const char *CitadelServiceNNTP="NNTP";
-const char *CitadelServiceNNTPS="NNTPS";
-
-CTDL_MODULE_INIT(nntp)
-{
- if (!threading)
- {
- CtdlRegisterServiceHook(CtdlGetConfigInt("c_nntp_port"),
- NULL,
- nntp_greeting,
- nntp_command_loop,
- NULL,
- CitadelServiceNNTP);
-
-#ifdef HAVE_OPENSSL
- CtdlRegisterServiceHook(CtdlGetConfigInt("c_nntps_port"),
- NULL,
- nntps_greeting,
- nntp_command_loop,
- NULL,
- CitadelServiceNNTPS);
-#endif
-
- CtdlRegisterSessionHook(nntp_cleanup_function, EVT_STOP, PRIO_STOP + 250);
- }
-
- /* return our module name for the log */
- return "nntp";
-}
projects / citadel.git / blobdiff