Feature request (module enhancement): Filter module with seperate flags for channel PM , Notice and other.

[ctcp-1]

(The other request we did for this seems to be in the wrong section since this is somewhat a module enhancement)
we used this filter module in V2 that used flags to seperate channel query and such to have more choice of a detailed monitor of
text i was wondering if it could be ported to V3 this would be a usefull future for networks that are liberal when it comes to messages sent privately and focus on messages sent to channels to be filtered and other configurable options of the filter module

thank you.

/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2016 Christoph Kern <sheogorath@shivering-isles.com>
 *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
 *   Copyright (C) 2004, 2008 Craig Edwards <craigedwards@brainbox.cc>
 *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
 *   Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
 *
 * This file is part of InspIRCd.  InspIRCd 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, version 2.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */


#include "inspircd.h"
#include "xline.h"
#include "m_regex.h"

/* $ModDesc: Text (spam) filtering */

class ModuleFilter;

enum FilterFlags
{
	FLAG_PART = 2,
	FLAG_QUIT = 4,
	FLAG_PRIVMSG = 8,
	FLAG_NOTICE = 16,
	FLAG_QUERY = 32
};

enum FilterAction
{
	FA_GLINE,
	FA_BLOCK,
	FA_SILENT,
	FA_KILL,
	FA_NONE
};

class FilterResult
{
 public:
	std::string freeform;
	std::string reason;
	FilterAction action;
	long gline_time;

	bool flag_no_opers;
	bool flag_part_message;
	bool flag_quit_message;
	bool flag_privmsg;
	bool flag_notice;
	bool flag_query;
	bool flag_strip_color;

	FilterResult(const std::string& free, const std::string& rea, FilterAction act, long gt, const std::string& fla) :
			freeform(free), reason(rea), action(act), gline_time(gt)
	{
		this->FillFlags(fla);
	}

	char FillFlags(const std::string &fl)
	{
		flag_no_opers = flag_part_message = flag_quit_message = flag_privmsg =
			flag_notice = flag_strip_color = false;

		for (std::string::const_iterator n = fl.begin(); n != fl.end(); ++n)
		{
			switch (*n)
			{
				case 'o':
					flag_no_opers = true;
				break;
				case 'P':
					flag_part_message = true;
				break;
				case 'q':
					flag_quit_message = true;
				break;
				case 'p':
					flag_privmsg = true;
				break;
				case 'n':
					flag_notice = true;
				break;
				case 'Q':
					flag_query = true;
				break;
				case 'c':
					flag_strip_color = true;
				break;
				case '*':
					flag_no_opers = flag_part_message = flag_quit_message =
						flag_privmsg = flag_notice = flag_strip_color = flag_query = true;
				break;
				default:
					return *n;
				break;
			}
		}
		return 0;
	}

	std::string GetFlags()
	{
		std::string flags;
		if (flag_no_opers)
			flags.push_back('o');
		if (flag_part_message)
			flags.push_back('P');
		if (flag_quit_message)
			flags.push_back('q');
		if (flag_privmsg)
			flags.push_back('p');
		if (flag_notice)
			flags.push_back('n');
		if (flag_query)
			flags.push_back('Q');

		/* Order is important here, 'c' must be the last char in the string as it is unsupported
		 * on < 2.0.10, and the logic in FillFlags() stops parsing when it ecounters an unknown
		 * character.
		 */
		if (flag_strip_color)
			flags.push_back('c');

		if (flags.empty())
			flags.push_back('-');

		return flags;
	}

	FilterResult()
	{
	}
};

class CommandFilter : public Command
{
 public:
	CommandFilter(Module* f)
		: Command(f, "FILTER", 1, 5)
	{
		flags_needed = 'o';
		this->syntax = "<filter-definition> <action> <flags> [<gline-duration>] :<reason>";
	}
	CmdResult Handle(const std::vector<std::string>&, User*);

	RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
	{
		return ROUTE_BROADCAST;
	}
};

class ImplFilter : public FilterResult
{
 public:
	Regex* regex;

	ImplFilter(ModuleFilter* mymodule, const std::string &rea, FilterAction act, long glinetime, const std::string &pat, const std::string &flgs);
};


class ModuleFilter : public Module
{
	bool initing;
	RegexFactory* factory;
	void FreeFilters();

 public:
	CommandFilter filtcommand;
	dynamic_reference<RegexFactory> RegexEngine;

	std::vector<ImplFilter> filters;
	int flags;

	std::set<std::string> exemptfromfilter; // List of channel names excluded from filtering.

	ModuleFilter();
	void init();
	CullResult cull();
	ModResult OnUserPreMessage(User* user,void* dest,int target_type, std::string &text, char status, CUList &exempt_list);
	FilterResult* FilterMatch(User* user, const std::string &text, int flags, int target_type = TYPE_CHANNEL);
	bool DeleteFilter(const std::string &freeform);
	std::pair<bool, std::string> AddFilter(const std::string &freeform, FilterAction type, const std::string &reason, long duration, const std::string &flags);
	ModResult OnUserPreNotice(User* user,void* dest,int target_type, std::string &text, char status, CUList &exempt_list);
	void OnRehash(User* user);
	Version GetVersion();
	std::string EncodeFilter(FilterResult* filter);
	FilterResult DecodeFilter(const std::string &data);
	void OnSyncNetwork(Module* proto, void* opaque);
	void OnDecodeMetaData(Extensible* target, const std::string &extname, const std::string &extdata);
	ModResult OnStats(char symbol, User* user, string_list &results);
	ModResult OnPreCommand(std::string &command, std::vector<std::string> &parameters, LocalUser *user, bool validated, const std::string &original_line);
	void OnUnloadModule(Module* mod);
	bool AppliesToMe(User* user, FilterResult* filter, int flags);
	void ReadFilters();
	static bool StringToFilterAction(const std::string& str, FilterAction& fa);
	static std::string FilterActionToString(FilterAction fa);
};

CmdResult CommandFilter::Handle(const std::vector<std::string> &parameters, User *user)
{
	if (parameters.size() == 1)
	{
		/* Deleting a filter */
		Module *me = creator;
		if (static_cast<ModuleFilter *>(me)->DeleteFilter(parameters[0]))
		{
			user->WriteServ("NOTICE %s :*** Removed filter '%s'", user->nick.c_str(), parameters[0].c_str());
			ServerInstance->SNO->WriteToSnoMask(IS_LOCAL(user) ? 'a' : 'A', "FILTER: "+user->nick+" removed filter '"+parameters[0]+"'");
			return CMD_SUCCESS;
		}
		else
		{
			user->WriteServ("NOTICE %s :*** Filter '%s' not found in list, try /stats s.", user->nick.c_str(), parameters[0].c_str());
			return CMD_FAILURE;
		}
	}
	else
	{
		/* Adding a filter */
		if (parameters.size() >= 4)
		{
			const std::string& freeform = parameters[0];
			FilterAction type;
			const std::string& flags = parameters[2];
			unsigned int reasonindex;
			long duration = 0;

			if (!ModuleFilter::StringToFilterAction(parameters[1], type))
			{
				user->WriteServ("NOTICE %s :*** Invalid filter type '%s'. Supported types are 'gline', 'none', 'block', 'silent' and 'kill'.", user->nick.c_str(), parameters[1].c_str());
				return CMD_FAILURE;
			}

			if (type == FA_GLINE)
			{
				if (parameters.size() >= 5)
				{
					duration = ServerInstance->Duration(parameters[3]);
					reasonindex = 4;
				}
				else
				{
					user->WriteServ("NOTICE %s :*** Not enough parameters: When setting a gline type filter, a gline duration must be specified as the third parameter.", user->nick.c_str());
					return CMD_FAILURE;
				}
			}
			else
			{
				reasonindex = 3;
			}

			Module *me = creator;
			std::pair<bool, std::string> result = static_cast<ModuleFilter *>(me)->AddFilter(freeform, type, parameters[reasonindex], duration, flags);
			if (result.first)
			{
				user->WriteServ("NOTICE %s :*** Added filter '%s', type '%s'%s%s, flags '%s', reason: '%s'", user->nick.c_str(), freeform.c_str(),
						parameters[1].c_str(), (duration ? ", duration " : ""), (duration ? parameters[3].c_str() : ""),
						flags.c_str(), parameters[reasonindex].c_str());

				ServerInstance->SNO->WriteToSnoMask(IS_LOCAL(user) ? 'a' : 'A', "FILTER: "+user->nick+" added filter '"+freeform+"', type '"+parameters[1]+"', "+(duration ? "duration "+parameters[3]+", " : "")+"flags '"+flags+"', reason: "+parameters[reasonindex]);

				return CMD_SUCCESS;
			}
			else
			{
				user->WriteServ("NOTICE %s :*** Filter '%s' could not be added: %s", user->nick.c_str(), freeform.c_str(), result.second.c_str());
				return CMD_FAILURE;
			}
		}
		else
		{
			user->WriteServ("NOTICE %s :*** Not enough parameters.", user->nick.c_str());
			return CMD_FAILURE;
		}

	}
}

bool ModuleFilter::AppliesToMe(User* user, FilterResult* filter, int iflags)
{
	if ((filter->flag_no_opers) && IS_OPER(user))
		return false;
	if ((iflags & FLAG_PRIVMSG) && (!filter->flag_privmsg))
		return false;
	if ((iflags & FLAG_NOTICE) && (!filter->flag_notice))
		return false;
	if ((iflags & FLAG_QUIT)   && (!filter->flag_quit_message))
		return false;
	if ((iflags & FLAG_PART)   && (!filter->flag_part_message))
		return false;
	if ((iflags & FLAG_QUERY) && (!filter->flag_query))
		return false;
	return true;
}

ModuleFilter::ModuleFilter()
	: initing(true), filtcommand(this), RegexEngine(this, "regex")
{
}

void ModuleFilter::init()
{
	ServerInstance->Modules->AddService(filtcommand);
	Implementation eventlist[] = { I_OnPreCommand, I_OnStats, I_OnSyncNetwork, I_OnDecodeMetaData, I_OnUserPreMessage, I_OnUserPreNotice, I_OnRehash, I_OnUnloadModule };
	ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
	OnRehash(NULL);
}

CullResult ModuleFilter::cull()
{
	FreeFilters();
	return Module::cull();
}

void ModuleFilter::FreeFilters()
{
	for (std::vector<ImplFilter>::const_iterator i = filters.begin(); i != filters.end(); ++i)
		delete i->regex;

	filters.clear();
}

ModResult ModuleFilter::OnUserPreMessage(User* user,void* dest,int target_type, std::string &text, char status, CUList &exempt_list)
{
	if (!IS_LOCAL(user))
		return MOD_RES_PASSTHRU;

	if (target_type == TYPE_USER)
	    flags = FLAG_QUERY;
	else
	    flags = FLAG_PRIVMSG;

	return OnUserPreNotice(user,dest,target_type,text,status,exempt_list);
}

ModResult ModuleFilter::OnUserPreNotice(User* user,void* dest,int target_type, std::string &text, char status, CUList &exempt_list)
{
	/* Leave ulines alone */
	if ((ServerInstance->ULine(user->server)) || (!IS_LOCAL(user)) || (target_type == TYPE_USER && (ServerInstance->ULine(((User*) dest)->server))))
		return MOD_RES_PASSTHRU;

	if (!flags)
		flags = FLAG_NOTICE;

	FilterResult* f = this->FilterMatch(user, text, flags, target_type);
	if (f)
	{
		std::string target;
		if (target_type == TYPE_USER)
		{
			User* t = (User*)dest;
			target = t->nick;
		}
		else if (target_type == TYPE_CHANNEL)
		{
			Channel* t = (Channel*)dest;
			if (exemptfromfilter.find(t->name) != exemptfromfilter.end())
				return MOD_RES_PASSTHRU;

			target = t->name;
		}
		if (f->action == FA_BLOCK)
		{
			ServerInstance->SNO->WriteGlobalSno('a', "FILTER: "+user->nick+" had their message filtered, target was "+target+": "+f->reason);
			if (target_type == TYPE_CHANNEL)
				user->WriteNumeric(404, "%s %s :Your Message to channel was blocked (%s)",user->nick.c_str(), target.c_str(), f->reason.c_str());
			else
				user->WriteServ("NOTICE "+user->nick+" :Your message to "+target+" was blocked: "+f->reason);
		}
		else if (f->action == FA_SILENT)
		{
			if (target_type == TYPE_CHANNEL)
				user->WriteNumeric(404, "%s %s :Message to channel blocked (%s)",user->nick.c_str(), target.c_str(), f->reason.c_str());
			else
				user->WriteServ("NOTICE "+user->nick+" :Your message to "+target+" was blocked: "+f->reason);
		}
		else if (f->action == FA_KILL)
		{
			ServerInstance->Users->QuitUser(user, "Filtered: " + f->reason);
		}
		else if (f->action == FA_GLINE)
		{
			GLine* gl = new GLine(ServerInstance->Time(), f->gline_time, ServerInstance->Config->ServerName.c_str(), f->reason.c_str(), "*", user->GetIPString());
			if (ServerInstance->XLines->AddLine(gl,NULL))
			{
				ServerInstance->XLines->ApplyLines();
			}
			else
				delete gl;
		}

		ServerInstance->Logs->Log("FILTER",DEFAULT,"FILTER: "+ user->nick + " had their message filtered, target was " + target + ": " + f->reason + " Action: " + ModuleFilter::FilterActionToString(f->action));
		return MOD_RES_DENY;
	}
	return MOD_RES_PASSTHRU;
}

ModResult ModuleFilter::OnPreCommand(std::string &command, std::vector<std::string> &parameters, LocalUser *user, bool validated, const std::string &original_line)
{
	if (validated && IS_LOCAL(user))
	{
		flags = 0;
		bool parting;

		if (command == "QUIT")
		{
			/* QUIT with no reason: nothing to do */
			if (parameters.size() < 1)
				return MOD_RES_PASSTHRU;

			parting = false;
			flags = FLAG_QUIT;
		}
		else if (command == "PART")
		{
			/* PART with no reason: nothing to do */
			if (parameters.size() < 2)
				return MOD_RES_PASSTHRU;

			if (exemptfromfilter.find(parameters[0]) != exemptfromfilter.end())
				return MOD_RES_PASSTHRU;

			parting = true;
			flags = FLAG_PART;
		}
		else
			/* We're only messing with PART and QUIT */
			return MOD_RES_PASSTHRU;

		FilterResult* f = this->FilterMatch(user, parameters[parting ? 1 : 0], flags);
		if (!f)
			/* PART or QUIT reason doesnt match a filter */
			return MOD_RES_PASSTHRU;

		/* We cant block a part or quit, so instead we change the reason to 'Reason filtered' */
		parameters[parting ? 1 : 0] = "Reason filtered";

		/* We're blocking, OR theyre quitting and its a KILL action
		 * (we cant kill someone whos already quitting, so filter them anyway)
		 */
		if ((f->action == FA_BLOCK) || (((!parting) && (f->action == FA_KILL))) || (f->action == FA_SILENT))
		{
			return MOD_RES_PASSTHRU;
		}
		else
		{
			/* Are they parting, if so, kill is applicable */
			if ((parting) && (f->action == FA_KILL))
			{
				user->WriteServ("NOTICE %s :*** Your PART message was filtered: %s", user->nick.c_str(), f->reason.c_str());
				ServerInstance->Users->QuitUser(user, "Filtered: " + f->reason);
			}
			if (f->action == FA_GLINE)
			{
				/* Note: We gline *@IP so that if their host doesnt resolve the gline still applies. */
				GLine* gl = new GLine(ServerInstance->Time(), f->gline_time, ServerInstance->Config->ServerName.c_str(), f->reason.c_str(), "*", user->GetIPString());
				if (ServerInstance->XLines->AddLine(gl,NULL))
				{
					ServerInstance->XLines->ApplyLines();
				}
				else
					delete gl;
			}
			return MOD_RES_DENY;
		}
	}
	return MOD_RES_PASSTHRU;
}

void ModuleFilter::OnRehash(User* user)
{
	ConfigTagList tags = ServerInstance->Config->ConfTags("exemptfromfilter");
	exemptfromfilter.clear();
	for (ConfigIter i = tags.first; i != tags.second; ++i)
	{
		std::string chan = i->second->getString("channel");
		if (!chan.empty())
			exemptfromfilter.insert(chan);
	}

	std::string newrxengine = ServerInstance->Config->ConfValue("filteropts")->getString("engine");

	factory = RegexEngine ? (RegexEngine.operator->()) : NULL;

	if (newrxengine.empty())
		RegexEngine.SetProvider("regex");
	else
		RegexEngine.SetProvider("regex/" + newrxengine);

	if (!RegexEngine)
	{
		if (newrxengine.empty())
			ServerInstance->SNO->WriteGlobalSno('a', "WARNING: No regex engine loaded - Filter functionality disabled until this is corrected.");
		else
			ServerInstance->SNO->WriteGlobalSno('a', "WARNING: Regex engine '%s' is not loaded - Filter functionality disabled until this is corrected.", newrxengine.c_str());

		initing = false;
		FreeFilters();
		return;
	}

	if ((!initing) && (RegexEngine.operator->() != factory))
	{
		ServerInstance->SNO->WriteGlobalSno('a', "Dumping all filters due to regex engine change");
		FreeFilters();
	}

	initing = false;
	ReadFilters();
}

Version ModuleFilter::GetVersion()
{
	return Version("Text (spam) filtering", VF_VENDOR | VF_COMMON, RegexEngine ? RegexEngine->name : "");
}

std::string ModuleFilter::EncodeFilter(FilterResult* filter)
{
	std::ostringstream stream;
	std::string x = filter->freeform;

	/* Hax to allow spaces in the freeform without changing the design of the irc protocol */
	for (std::string::iterator n = x.begin(); n != x.end(); n++)
		if (*n == ' ')
			*n = '\7';

	stream << x << " " << FilterActionToString(filter->action) << " " << filter->GetFlags() << " " << filter->gline_time << " :" << filter->reason;
	return stream.str();
}

FilterResult ModuleFilter::DecodeFilter(const std::string &data)
{
	std::string filteraction;
	FilterResult res;
	irc::tokenstream tokens(data);
	tokens.GetToken(res.freeform);
	tokens.GetToken(filteraction);
	if (!StringToFilterAction(filteraction, res.action))
		throw ModuleException("Invalid action: " + filteraction);

	std::string filterflags;
	tokens.GetToken(filterflags);
	char c = res.FillFlags(filterflags);
	if (c != 0)
		throw ModuleException("Invalid flag: '" + std::string(1, c) + "'");

	tokens.GetToken(res.gline_time);
	tokens.GetToken(res.reason);

	/* Hax to allow spaces in the freeform without changing the design of the irc protocol */
	for (std::string::iterator n = res.freeform.begin(); n != res.freeform.end(); n++)
		if (*n == '\7')
			*n = ' ';

	return res;
}

void ModuleFilter::OnSyncNetwork(Module* proto, void* opaque)
{
	for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); ++i)
	{
		proto->ProtoSendMetaData(opaque, NULL, "filter", EncodeFilter(&(*i)));
	}
}

void ModuleFilter::OnDecodeMetaData(Extensible* target, const std::string &extname, const std::string &extdata)
{
	if ((target == NULL) && (extname == "filter"))
	{
		try
		{
			FilterResult data = DecodeFilter(extdata);
			this->AddFilter(data.freeform, data.action, data.reason, data.gline_time, data.GetFlags());
		}
		catch (ModuleException& e)
		{
			ServerInstance->Logs->Log("m_filter", DEBUG, "Error when unserializing filter: " + std::string(e.GetReason()));
		}
	}
}

ImplFilter::ImplFilter(ModuleFilter* mymodule, const std::string &rea, FilterAction act, long glinetime, const std::string &pat, const std::string &flgs)
		: FilterResult(pat, rea, act, glinetime, flgs)
{
	if (!mymodule->RegexEngine)
		throw ModuleException("Regex module implementing '"+mymodule->RegexEngine.GetProvider()+"' is not loaded!");
	regex = mymodule->RegexEngine->Create(pat);
}

FilterResult* ModuleFilter::FilterMatch(User* user, const std::string &text, int flgs, int target_type)
{
	static std::string stripped_text;
	stripped_text.clear();

	for (std::vector<ImplFilter>::iterator index = filters.begin(); index != filters.end(); index++)
	{
		FilterResult* filter = dynamic_cast<FilterResult*>(&(*index));

		/* Skip ones that dont apply to us */
		if (!AppliesToMe(user, filter, flgs))
			continue;

		if ((filter->flag_strip_color) && (stripped_text.empty()))
		{
			stripped_text = text;
			InspIRCd::StripColor(stripped_text);
		}

		//ServerInstance->Logs->Log("m_filter", DEBUG, "Match '%s' against '%s'", text.c_str(), index->freeform.c_str());
		if (index->regex->Matches(filter->flag_strip_color ? stripped_text : text))
		{
			//ServerInstance->Logs->Log("m_filter", DEBUG, "MATCH");
			return &*index;
		}
		//ServerInstance->Logs->Log("m_filter", DEBUG, "NO MATCH");
	}
	return NULL;
}

bool ModuleFilter::DeleteFilter(const std::string &freeform)
{
	for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); i++)
	{
		if (i->freeform == freeform)
		{
			delete i->regex;
			filters.erase(i);
			return true;
		}
	}
	return false;
}

std::pair<bool, std::string> ModuleFilter::AddFilter(const std::string &freeform, FilterAction type, const std::string &reason, long duration, const std::string &flgs)
{
	for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); i++)
	{
		if (i->freeform == freeform)
		{
			return std::make_pair(false, "Filter already exists");
		}
	}

	try
	{
		filters.push_back(ImplFilter(this, reason, type, duration, freeform, flgs));
	}
	catch (ModuleException &e)
	{
		ServerInstance->Logs->Log("m_filter", DEFAULT, "Error in regular expression '%s': %s", freeform.c_str(), e.GetReason());
		return std::make_pair(false, e.GetReason());
	}
	return std::make_pair(true, "");
}

bool ModuleFilter::StringToFilterAction(const std::string& str, FilterAction& fa)
{
	irc::string s(str.c_str());

	if (s == "gline")
		fa = FA_GLINE;
	else if (s == "block")
		fa = FA_BLOCK;
	else if (s == "silent")
		fa = FA_SILENT;
	else if (s == "kill")
		fa = FA_KILL;
	else if (s == "none")
		fa = FA_NONE;
	else
		return false;

	return true;
}

std::string ModuleFilter::FilterActionToString(FilterAction fa)
{
	switch (fa)
	{
		case FA_GLINE:  return "gline";
		case FA_BLOCK:  return "block";
		case FA_SILENT: return "silent";
		case FA_KILL:   return "kill";
		default:		return "none";
	}
}

void ModuleFilter::ReadFilters()
{
	ConfigTagList tags = ServerInstance->Config->ConfTags("keyword");
	for (ConfigIter i = tags.first; i != tags.second; ++i)
	{
		std::string pattern = i->second->getString("pattern");
		this->DeleteFilter(pattern);

		std::string reason = i->second->getString("reason");
		std::string action = i->second->getString("action");
		std::string flgs = i->second->getString("flags");
		long gline_time = ServerInstance->Duration(i->second->getString("duration"));
		if (flgs.empty())
			flgs = "*";

		FilterAction fa;
		if (!StringToFilterAction(action, fa))
			fa = FA_NONE;

		try
		{
			filters.push_back(ImplFilter(this, reason, fa, gline_time, pattern, flgs));
			ServerInstance->Logs->Log("m_filter", DEFAULT, "Regular expression %s loaded.", pattern.c_str());
		}
		catch (ModuleException &e)
		{
			ServerInstance->Logs->Log("m_filter", DEFAULT, "Error in regular expression '%s': %s", pattern.c_str(), e.GetReason());
		}
	}
}

ModResult ModuleFilter::OnStats(char symbol, User* user, string_list &results)
{
	if (symbol == 's')
	{
		for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); i++)
		{
			results.push_back(ServerInstance->Config->ServerName+" 223 "+user->nick+" :"+RegexEngine.GetProvider()+":"+i->freeform+" "+i->GetFlags()+" "+FilterActionToString(i->action)+" "+ConvToStr(i->gline_time)+" :"+i->reason);
		}
		for (std::set<std::string>::iterator i = exemptfromfilter.begin(); i != exemptfromfilter.end(); ++i)
		{
			results.push_back(ServerInstance->Config->ServerName+" 223 "+user->nick+" :EXEMPT "+(*i));
		}
	}
	return MOD_RES_PASSTHRU;
}

void ModuleFilter::OnUnloadModule(Module* mod)
{
	// If the regex engine became unavailable or has changed, remove all filters
	if (!RegexEngine)
	{
		FreeFilters();
	}
	else if (RegexEngine.operator->() != factory)
	{
		factory = RegexEngine.operator->();
		FreeFilters();
	}
}

MODULE_INIT(ModuleFilter)