355 lines
7.6 KiB
C
355 lines
7.6 KiB
C
/*****************************************************************************
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*
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* $Id$
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* Purpose ...............: Message areas record Access
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*
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*****************************************************************************
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* Copyright (C) 1997-2004
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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#include "../config.h"
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#include "mbselib.h"
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#include "users.h"
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#include "mbsedb.h"
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char msgs_fil[PATH_MAX]; /* Database filename */
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char mgrp_fil[PATH_MAX]; /* Group database filename */
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long msgs_pos = -1; /* Current record position */
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long mgrp_pos = -1; /* Current group position */
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unsigned long msgs_crc = -1; /* CRC value of current record */
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unsigned long mgrp_crc = -1; /* CRC value of group record */
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static long sysstart, sysrecord;
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int InitMsgs(void)
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{
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FILE *fil;
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memset(&msgs, 0, sizeof(msgs));
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memset(&mgroup, 0, sizeof(mgroup));
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LoadConfig();
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sysstart = -1;
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sprintf(msgs_fil, "%s/etc/mareas.data", getenv("MBSE_ROOT"));
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if ((fil = fopen(msgs_fil, "r")) == NULL)
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return FALSE;
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fread(&msgshdr, sizeof(msgshdr), 1, fil);
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fseek(fil, 0, SEEK_END);
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msgs_cnt = (ftell(fil) - msgshdr.hdrsize) / (msgshdr.recsize + msgshdr.syssize);
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fclose(fil);
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sprintf(mgrp_fil, "%s/etc/mgroups.data", getenv("MBSE_ROOT"));
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return TRUE;
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}
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int smsgarea(char *, int);
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int smsgarea(char *what, int newsgroup)
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{
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FILE *fil;
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if ((fil = fopen(msgs_fil, "r")) == NULL) {
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return FALSE;
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}
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fread(&msgshdr, sizeof(msgshdr), 1, fil);
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while (fread(&msgs, msgshdr.recsize, 1, fil) == 1) {
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/*
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* Mark the start of the connected systems records
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* for later use and skip the system records.
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*/
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msgs_pos = ftell(fil) - msgshdr.recsize;
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sysstart = ftell(fil);
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fseek(fil, msgshdr.syssize, SEEK_CUR);
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if (((!strcmp(what, msgs.Tag) && !newsgroup) || (!strcmp(what, msgs.Newsgroup) && newsgroup)) && msgs.Active) {
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sysrecord = 0;
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fclose(fil);
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msgs_crc = 0xffffffff;
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msgs_crc = upd_crc32((char *)&msgs, msgs_crc, msgshdr.recsize);
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mgrp_pos = -1;
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mgrp_crc = -1;
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if (strlen(msgs.Group)) {
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if ((fil = fopen(mgrp_fil, "r")) != NULL) {
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fread(&mgrouphdr, sizeof(mgrouphdr), 1, fil);
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while ((fread(&mgroup, mgrouphdr.recsize, 1, fil)) == 1) {
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if (!strcmp(msgs.Group, mgroup.Name)) {
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mgrp_pos = ftell(fil) - mgrouphdr.recsize;
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mgrp_crc = 0xffffffff;
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mgrp_crc = upd_crc32((char *)&mgroup, mgrp_crc, mgrouphdr.recsize);
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break;
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}
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}
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fclose(fil);
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}
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} else
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memset(&mgroup, 0, sizeof(mgroup));
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return TRUE;
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}
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}
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sysstart = -1;
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msgs_crc = -1;
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msgs_pos = -1;
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fclose(fil);
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return FALSE;
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}
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int SearchMsgs(char *Area)
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{
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return smsgarea(Area, FALSE);
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}
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int SearchMsgsNews(char *Group)
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{
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return smsgarea(Group, TRUE);
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}
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/*
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* Check if system is connected
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*/
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int MsgSystemConnected(sysconnect Sys)
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{
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FILE *fil;
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sysconnect T;
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if (sysstart == -1)
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return FALSE;
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if ((fil = fopen(msgs_fil, "r")) == NULL)
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return FALSE;
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if (fseek(fil, sysstart, SEEK_SET) != 0) {
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fclose(fil);
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return FALSE;
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}
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while (ftell(fil) != (sysstart + msgshdr.syssize)) {
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fread(&T, sizeof(sysconnect), 1, fil);
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if ((T.aka.zone == Sys.aka.zone) &&
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(T.aka.net == Sys.aka.net) &&
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(T.aka.node == Sys.aka.node) &&
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(T.aka.point == Sys.aka.point)) {
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fclose(fil);
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return TRUE;
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}
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}
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fclose(fil);
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return FALSE;
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}
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/*
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* Change system's status, if the Read or Write flags are clear,
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* the connection will be erased, else updated or connected.
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*/
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int MsgSystemConnect(sysconnect *Sys, int New)
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{
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FILE *fil;
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sysconnect T;
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if (sysstart == -1)
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return FALSE;
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if ((fil = fopen(msgs_fil, "r+")) == NULL)
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return FALSE;
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if (fseek(fil, sysstart, SEEK_SET) != 0) {
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fclose(fil);
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return FALSE;
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}
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while (ftell(fil) != (sysstart + msgshdr.syssize)) {
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fread(&T, sizeof(sysconnect), 1, fil);
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/*
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* For a new connection, search an empty slot.
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*/
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if (New && (!T.aka.zone)) {
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fseek(fil, - sizeof(sysconnect), SEEK_CUR);
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fwrite(Sys, sizeof(sysconnect), 1, fil);
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fclose(fil);
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return TRUE;
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}
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/*
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* If not new it is an update
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*/
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if ((!New) && (T.aka.zone == Sys->aka.zone) &&
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(T.aka.net == Sys->aka.net) && (T.aka.node == Sys->aka.node) &&
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(T.aka.point == Sys->aka.point)) {
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fseek(fil, - sizeof(sysconnect), SEEK_CUR);
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if ((!Sys->sendto) && (!Sys->receivefrom)) {
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/*
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* It's a deletion, if the area is mandatory or
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* the node is cutoff, refuse the deletion.
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*/
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if (msgs.Mandatory || T.cutoff) {
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fclose(fil);
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return FALSE;
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}
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memset(&T, 0, sizeof(sysconnect));
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fwrite(&T, sizeof(sysconnect), 1, fil);
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} else {
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/*
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* It's a update, refuse it if the node is cutoff.
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*/
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if (T.cutoff) {
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fclose(fil);
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return FALSE;
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}
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fwrite(Sys, sizeof(sysconnect), 1, fil);
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}
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fclose(fil);
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return TRUE;
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}
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}
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fclose(fil);
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return FALSE;
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}
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int GetMsgSystem(sysconnect * Sys, int First)
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{
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FILE *fil;
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memset(Sys, 0, sizeof(sysconnect));
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if (sysstart == -1)
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return FALSE;
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if (First)
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sysrecord = 0;
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else
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sysrecord++;
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if (sysrecord >= CFG.toss_systems)
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return FALSE;
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if ((fil = fopen(msgs_fil, "r")) == NULL)
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return FALSE;
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if (fseek(fil, sysstart + (sysrecord * sizeof(sysconnect)), SEEK_SET) != 0) {
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fclose(fil);
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return FALSE;
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}
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if (fread(Sys, sizeof(sysconnect), 1, fil) == 1) {
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fclose(fil);
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return TRUE;
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}
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fclose(fil);
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return FALSE;
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}
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int SearchNetBoard(unsigned short zone, unsigned short net)
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{
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FILE *fil;
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mgrp_pos = -1;
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mgrp_crc = -1;
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if ((fil = fopen(msgs_fil, "r")) == NULL) {
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return FALSE;
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}
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fread(&msgshdr, sizeof(msgshdr), 1, fil);
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while (fread(&msgs, msgshdr.recsize, 1, fil) == 1) {
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fseek(fil, msgshdr.syssize, SEEK_CUR);
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if ((msgs.Type == NETMAIL) && (msgs.Active) &&
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(zone == msgs.Aka.zone) && (net == msgs.Aka.net)) {
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msgs_pos = ftell(fil) - (msgshdr.recsize + msgshdr.syssize);
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msgs_crc = 0xffffffff;
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msgs_crc = upd_crc32((char *)&msgs, msgs_crc, msgshdr.recsize);
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fclose(fil);
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return TRUE;
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}
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}
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fclose(fil);
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msgs_pos = -1;
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msgs_crc = -1;
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sysstart = -1;
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return FALSE;
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}
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void UpdateMsgs()
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{
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unsigned long crc = 0xffffffff;
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FILE *fil;
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if (msgs_pos == -1)
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return;
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crc = upd_crc32((char *)&msgs, crc, msgshdr.recsize);
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if (crc != msgs_crc) {
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if ((fil = fopen(msgs_fil, "r+")) == NULL) {
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msgs_pos = -1;
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return;
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}
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fseek(fil, msgs_pos, SEEK_SET);
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fwrite(&msgs, msgshdr.recsize, 1, fil);
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fclose(fil);
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}
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msgs_pos = -1;
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msgs_crc = -1;
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if (mgrp_pos == -1)
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return;
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crc = 0xffffffff;
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crc = upd_crc32((char *)&mgroup, crc, mgrouphdr.recsize);
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if (crc != mgrp_crc) {
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if ((fil = fopen(mgrp_fil, "r+")) == NULL) {
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mgrp_pos = -1;
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return;
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}
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fseek(fil, mgrp_pos, SEEK_SET);
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fwrite(&mgroup, mgrouphdr.recsize, 1, fil);
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fclose(fil);
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}
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mgrp_pos = -1;
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mgrp_crc = -1;
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}
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