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/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd is copyright (C) 2002-2004 ChatSpike-Dev.
* E-mail:
* <brain@chatspike.net>
* <Craig@chatspike.net>
*
* Written by Craig Edwards, Craig McLure, and others.
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
using namespace std;
// Message and notice filtering using regex patterns
// a module based on the original work done by Craig Edwards in 2003
// for the chatspike network.
#include <stdio.h>
#include <string>
#include <pcre.h>
#include "users.h"
#include "channels.h"
#include "modules.h"
#include "helperfuncs.h"
class FilterPCREException : public ModuleException
{
public:
virtual char* GetReason()
{
return "Could not find <filter file=\"\"> definition in your config file!";
}
};
/* $ModDesc: m_filter with regexps */
/* $CompileFlags: -I/usr/local/include */
/* $LinkerFlags: -L/usr/local/lib -lpcre */
class ModuleFilterPCRE : public Module
{
Server *Srv;
ConfigReader *Conf, *MyConf;
std::vector<pcre*> filters;
pcre *re;
const char *error;
int erroffset;
public:
ModuleFilterPCRE(Server* Me)
: Module::Module(Me)
{
// read the configuration file on startup.
// it is perfectly valid to set <filter file> to the value of the
// main config file, then append your <keyword> tags to the bottom
// of the main config... but rather messy. That's why the capability
// of using a seperate config file is provided.
Srv = Me;
Conf = new ConfigReader;
std::string filterfile = Conf->ReadValue("filter","file",0);
MyConf = new ConfigReader(filterfile);
if ((filterfile == "") || (!MyConf->Verify()))
{
FilterPCREException e;
throw(e);
}
Srv->Log(DEFAULT,std::string("m_filter_pcre: read configuration from ")+filterfile);
filters.clear();
for (int index = 0; index < MyConf->Enumerate("keyword"); index++)
{
std::string pattern = MyConf->ReadValue("keyword","pattern",index);
re = pcre_compile(pattern.c_str(),0,&error,&erroffset,NULL);
if (!re)
{
log(DEFAULT,"Error in regular expression: %s at offset %d: %s\n", pattern.c_str(), erroffset, error);
log(DEFAULT,"Regular expression %s not loaded.", pattern.c_str());
}
else
{
filters.push_back(re);
log(DEFAULT,"Regular expression %s loaded.", pattern.c_str());
}
}
}
virtual ~ModuleFilterPCRE()
{
delete MyConf;
delete Conf;
}
void Implements(char* List)
{
List[I_OnUserPreMessage] = List[I_OnUserPreNotice] = List[I_OnRehash] = 1;
}
// format of a config entry is <keyword pattern="^regexp$" reason="Some reason here" action="kill/block">
virtual int OnUserPreMessage(userrec* user,void* dest,int target_type, std::string &text, char status)
{
return OnUserPreNotice(user,dest,target_type,text,status);
}
virtual int OnUserPreNotice(userrec* user,void* dest,int target_type, std::string &text, char status)
{
for (unsigned int index = 0; index < filters.size(); index++)
{
if (pcre_exec(filters[index],NULL,text.c_str(),text.length(),0,0,NULL,0) > -1)
{
std::string target = "";
std::string reason = MyConf->ReadValue("keyword","reason",index);
std::string do_action = MyConf->ReadValue("keyword","action",index);
if (do_action == "")
do_action = "none";
if (target_type == TYPE_USER)
{
userrec* t = (userrec*)dest;
target = std::string(t->nick);
}
else if (target_type == TYPE_CHANNEL)
{
chanrec* t = (chanrec*)dest;
target = std::string(t->name);
}
if (do_action == "block")
{
Srv->SendOpers(std::string("Filter: ")+std::string(user->nick)+
std::string(" had their notice filtered, target was ")+
target+": "+reason);
Srv->SendTo(NULL,user,"NOTICE "+std::string(user->nick)+
" :Your notice has been filtered and opers notified: "+reason);
}
Srv->Log(DEFAULT,std::string("Filter: ")+std::string(user->nick)+
std::string(" had their notice filtered, target was ")+
target+": "+reason+" Action: "+do_action);
if (do_action == "kill")
{
Srv->QuitUser(user,reason);
}
return 1;
}
}
return 0;
}
virtual void OnRehash(const std::string ¶meter)
{
// reload our config file on rehash - we must destroy and re-allocate the classes
// to call the constructor again and re-read our data.
delete Conf;
delete MyConf;
Conf = new ConfigReader;
std::string filterfile = Conf->ReadValue("filter","file",0);
// this automatically re-reads the configuration file into the class
MyConf = new ConfigReader(filterfile);
if ((filterfile == "") || (!MyConf->Verify()))
{
FilterPCREException e;
// bail if the user forgot to create a config file
throw(e);
}
Srv->Log(DEFAULT,std::string("m_filter_pcre: read configuration from ")+filterfile);
filters.clear();
for (int index = 0; index < MyConf->Enumerate("keyword"); index++)
{
std::string pattern = MyConf->ReadValue("keyword","pattern",index);
re = pcre_compile(pattern.c_str(),0,&error,&erroffset,NULL);
if (!re)
{
log(DEFAULT,"Error in regular expression: %s at offset %d: %s\n", pattern.c_str(), erroffset, error);
log(DEFAULT,"Regular expression %s not loaded.", pattern.c_str());
}
else
{
filters.push_back(re);
log(DEFAULT,"Regular expression %s loaded.", pattern.c_str());
}
}
}
virtual Version GetVersion()
{
// This is version 2 because version 1.x is the unreleased unrealircd module
return Version(3,0,0,0,VF_VENDOR);
}
};
// stuff down here is the module-factory stuff. For basic modules you can ignore this.
class ModuleFilterPCREFactory : public ModuleFactory
{
public:
ModuleFilterPCREFactory()
{
}
~ModuleFilterPCREFactory()
{
}
virtual Module * CreateModule(Server* Me)
{
return new ModuleFilterPCRE(Me);
}
};
extern "C" void * init_module( void )
{
return new ModuleFilterPCREFactory;
}
|
