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/*
* A server-side module for Citadel designed to filter idiots off the network.
*
* Copyright (c) 2002-2017 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 <fcntl.h>
#include <signal.h>
#include <pwd.h>
#include <errno.h>
#include <sys/types.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include <sys/wait.h>
#include <string.h>
#include <limits.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 "database.h"
#include "msgbase.h"
#include "ctdl_module.h"
typedef struct FilterList FilterList;
struct FilterList {
FilterList *next;
char fl_user[SIZ];
char fl_room[SIZ];
char fl_node[SIZ];
};
struct FilterList *filterlist = NULL;
/*
* Keep track of what messages to reject
*/
FilterList *load_filter_list(void) {
char *serialized_list = NULL;
int i;
char buf[SIZ];
FilterList *newlist = NULL;
FilterList *nptr;
serialized_list = CtdlGetSysConfig(FILTERLIST);
if (serialized_list == NULL) return(NULL); /* if null, no entries */
/* Use the string tokenizer to grab one line at a time */
for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
extract_token(buf, serialized_list, i, '\n', sizeof buf);
nptr = (FilterList *) malloc(sizeof(FilterList));
extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
striplt(nptr->fl_user);
extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
striplt(nptr->fl_room);
extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
striplt(nptr->fl_node);
/* Cowardly refuse to add an any/any/any entry that would
* end up filtering every single message.
*/
if (IsEmptyStr(nptr->fl_user) &&
IsEmptyStr(nptr->fl_room) &&
IsEmptyStr(nptr->fl_node)) {
free(nptr);
}
else {
nptr->next = newlist;
newlist = nptr;
}
}
free(serialized_list);
return newlist;
}
void free_filter_list(FilterList *fl) {
if (fl == NULL) return;
free_filter_list(fl->next);
free(fl);
}
void free_netfilter_list(void)
{
free_filter_list(filterlist);
filterlist = NULL;
}
void load_network_filter_list(void)
{
filterlist = load_filter_list();
}
/*
* This handler detects whether an incoming network message is from some
* moron user who the site operator has elected to filter out. If a match
* is found, the message is rejected.
*/
int filter_the_idiots(struct CtdlMessage *msg, char *target_room) {
FilterList *fptr;
int zap_user = 0;
int zap_room = 0;
int zap_node = 0;
if ( (msg == NULL) || (filterlist == NULL) ) {
return(0);
}
for (fptr = filterlist; fptr != NULL; fptr = fptr->next) {
zap_user = 0;
zap_room = 0;
zap_node = 0;
if (!CM_IsEmpty(msg, eAuthor)) {
if ( (!strcasecmp(msg->cm_fields[eAuthor], fptr->fl_user))
|| (fptr->fl_user[0] == 0) ) {
zap_user = 1;
}
}
if (!CM_IsEmpty(msg, eRemoteRoom)) {
if ( (!strcasecmp(msg->cm_fields[eRemoteRoom], fptr->fl_room))
|| (fptr->fl_room[0] == 0) ) {
zap_room = 1;
}
}
if (!CM_IsEmpty(msg, eOriginalRoom)) {
if ( (!strcasecmp(msg->cm_fields[eOriginalRoom], fptr->fl_room))
|| (fptr->fl_room[0] == 0) ) {
zap_room = 1;
}
}
if (!CM_IsEmpty(msg, eNodeName)) {
if ( (!strcasecmp(msg->cm_fields[eNodeName], fptr->fl_node))
|| (fptr->fl_node[0] == 0) ) {
zap_node = 1;
}
}
if (zap_user + zap_room + zap_node == 3) return(1);
}
return(0);
}
CTDL_MODULE_INIT(netfilter)
{
if (!threading)
{
/*
currently unsupported.
CtdlRegisterNetprocHook(filter_the_idiots);
*/
}
/* return our module name for the log */
return "netfilter";
}
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