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/*
kbs - Simple, easily fooled, POP3 spam filter
Copyright (C) 2003 Ian Cowburn (ianc@noddybox.demon.co.uk)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-------------------------------------------------------------------------
Rules database
*/
static const char id[]="$Id$";
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <stdio.h>
#include <ctype.h>
#include "global.h"
#include "dbase.h"
#include "dstring.h"
#include "config.h"
#include "rexp.h"
#include "util.h"
/* ---------------------------------------- TYPES
*/
struct Domain
{
char *name;
int def_block;
int no_user;
int no_block;
int no_allow;
char **user;
char **block;
char **allow;
Domain *next;
Domain *prev;
};
/* ---------------------------------------- GLOBALS
*/
static Domain *head;
static Domain *tail;
static int no_trusted_users=0;
static int no_trusted_domains=0;
static char **trusted_user=NULL;
static char **trusted_domain=NULL;
/* ---------------------------------------- PRVIVATE FUNCTIONS
*/
static int IsTrustedUser(const char *username)
{
int f;
for(f=0;f<no_trusted_users;f++)
{
if (strcasecmp(username,trusted_user[f])==0)
return TRUE;
}
return FALSE;
}
static int IsTrustedDomain(const char *domain)
{
int f;
for(f=0;f<no_trusted_domains;f++)
{
if (strcasecmp(domain,trusted_domain[f])==0)
return TRUE;
}
return FALSE;
}
static const Domain *GetDomain(const char *domain)
{
Domain *dom;
dom=head;
while(dom)
{
if (RExpSearch(dom->name,domain)==RE_Found)
return dom;
dom=dom->next;
}
return NULL;
}
static void DeJunk(DString ds, const char *p)
{
int last_ws=FALSE;
while(*p)
{
if (isspace(*p))
{
if (!last_ws)
DSAddChar(ds,' ');
last_ws=TRUE;
}
else
last_ws=FALSE;
if (isalnum(*p))
{
DSAddChar(ds,*p);
}
p++;
}
}
/* ---------------------------------------- INTERFACES
*/
Domain *DBNewDomain(const char *regexp)
{
Domain *dom;
dom=Malloc(sizeof *dom);
dom->name=CopyStr(regexp);
dom->def_block=FALSE;
dom->no_user=0;
dom->no_block=0;
dom->no_allow=0;
dom->user=NULL;
dom->block=NULL;
dom->allow=NULL;
if (tail)
tail->next=dom;
else
head=tail=dom;
dom->prev=tail;
dom->next=NULL;
return dom;
}
void DBDefault(Domain *domain, int block)
{
domain->def_block=block;
}
void DBBlockUser(Domain *domain, const char *username)
{
domain->no_user++;
domain->user=Realloc(domain->user,sizeof(char *)*domain->no_user);
domain->user[domain->no_user-1]=CopyStr(username);
}
void DBAllowSubject(Domain *domain, const char *regexp)
{
domain->no_allow++;
domain->allow=Realloc(domain->allow,sizeof(char *)*domain->no_allow);
domain->allow[domain->no_allow-1]=CopyStr(regexp);
}
void DBBlockSubject(Domain *domain, const char *regexp)
{
domain->no_block++;
domain->block=Realloc(domain->block,sizeof(char *)*domain->no_block);
domain->block[domain->no_block-1]=CopyStr(regexp);
}
void DBTrustedUser(const char *username)
{
no_trusted_users++;
trusted_user=Realloc(trusted_user,sizeof(char *)*no_trusted_users);
trusted_user[no_trusted_users-1]=CopyStr(username);
}
void DBTrustedDomain(const char *domain)
{
no_trusted_domains++;
trusted_domain=Realloc(trusted_domain,sizeof(char *)*no_trusted_domains);
trusted_domain[no_trusted_domains-1]=CopyStr(domain);
}
int DBBlockMessage(const POP3Message *msg)
{
static const char *html="text/html";
DString ds;
const Domain *dom;
int f;
if (ConfigInt(CONFIG_BLOCKHTML) &&
strncmp(msg->content_type,html,strlen(html))==0)
{
return TRUE;
}
if (IsTrustedDomain(msg->from_domain))
return FALSE;
if (IsTrustedUser(msg->from_uname))
return FALSE;
if (!(dom=GetDomain(msg->from_domain)))
return FALSE;
for(f=0;f<dom->no_user;f++)
{
if (ConfigInt(CONFIG_CASESENSE))
{
if (strcmp(dom->user[f],msg->from_uname)==0)
return TRUE;
}
else
{
if (strcasecmp(dom->user[f],msg->from_uname)==0)
return TRUE;
}
}
ds=DSInit();
if (ConfigInt(CONFIG_DEJUNK))
DeJunk(ds,msg->subject);
else
DSAddCP(ds,msg->subject);
for(f=0;f<dom->no_allow;f++)
{
if (RExpSearch(dom->allow[f],ds->text)==RE_Found)
{
DSFree(ds);
return FALSE;
}
}
for(f=0;f<dom->no_block;f++)
{
if (RExpSearch(dom->block[f],ds->text)==RE_Found)
{
DSFree(ds);
return TRUE;
}
}
DSFree(ds);
return dom->def_block;
}
/* END OF FILE */
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