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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.
*
* ---------------------------------------------------
*/
// 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 "inspircd.h"
class FilterPCREException : public ModuleException
{
public:
virtual const char* GetReason()
{
return "Could not find <filter file=\"\"> definition in your config file!";
}
};
/* $ModDesc: m_filter with regexps */
/* $CompileFlags: -I`pcre-config --prefix`/include */
/* $LinkerFlags: `pcre-config --libs` `perl extra/pcre_rpath.pl` -lpcre */
class ModuleFilterPCRE : public Module
{
class Filter
{
public:
pcre* regexp;
std::string reason;
std::string action;
Filter(pcre* r, const std::string &rea, const std::string &act)
: regexp(r), reason(rea), action(act)
{
}
};
InspIRCd* Srv;
std::vector<Filter> filters;
pcre *re;
const char *error;
int erroffset;
public:
ModuleFilterPCRE(InspIRCd* Me)
: Module::Module(Me), Srv(Me)
{
OnRehash("");
}
virtual ~ModuleFilterPCRE()
{
}
void Implements(char* List)
{
List[I_OnUserPreMessage] = List[I_OnUserPreNotice] = List[I_OnRehash] = 1;
}
// format of a config entry is <keyword pattern="^regexp$" 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++)
{
Filter& filt = filters[index];
if (pcre_exec(filt.regexp,NULL,text.c_str(),text.length(),0,0,NULL,0) > -1)
{
const char* target;
if(filt.action.empty())
filt.action = "none";
if (target_type == TYPE_USER)
{
userrec* t = (userrec*)dest;
target = t->nick;
}
else if (target_type == TYPE_CHANNEL)
{
chanrec* t = (chanrec*)dest;
target = t->name;
}
else
{
target = "";
}
ServerInstance->Log(DEFAULT, "Filter: %s had their notice filtered, target was %s: %s Action: %s", user->nick, target, filt.reason.c_str(), filt.action.c_str());
if (filt.action == "block")
{
Srv->WriteOpers("Filter: %s had their notice filtered, target was %s: %s", user->nick, target, filt.reason.c_str());
user->WriteServ("NOTICE "+std::string(user->nick)+" :Your notice has been filtered and opers notified: "+filt.reason);
}
else if (filt.action == "kill")
{
userrec::QuitUser(Srv, user, filt.reason);
}
return 1;
}
}
return 0;
}
virtual void OnRehash(const std::string ¶meter)
{
/* Read the configuration file on startup and rehash.
* 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.
*/
ConfigReader Conf(Srv);
std::string filterfile = Conf.ReadValue("filter", "file", 0);
ConfigReader MyConf(Srv, filterfile);
if (filterfile.empty() || !MyConf.Verify())
{
FilterPCREException e;
throw(e);
}
ServerInstance->Log(DEFAULT,"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);
std::string reason = MyConf.ReadValue("keyword","reason",index);
std::string action = MyConf.ReadValue("keyword","action",index);
re = pcre_compile(pattern.c_str(),0,&error,&erroffset,NULL);
if (!re)
{
ServerInstance->Log(DEFAULT,"Error in regular expression: %s at offset %d: %s\n", pattern.c_str(), erroffset, error);
ServerInstance->Log(DEFAULT,"Regular expression %s not loaded.", pattern.c_str());
}
else
{
filters.push_back(Filter(re, reason, action));
ServerInstance->Log(DEFAULT,"Regular expression %s loaded.", pattern.c_str());
}
}
}
virtual Version GetVersion()
{
/* Version 1.x is the unreleased unrealircd module */
return Version(3,2,0,0,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(InspIRCd* Me)
{
return new ModuleFilterPCRE(Me);
}
};
extern "C" void * init_module( void )
{
return new ModuleFilterPCREFactory;
}
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