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home » brain » inspircd-cvs » inspircd » src » modules » extra

m_filter_pcre.cpp

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/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
 * See: http://www.inspircd.org/wiki/index.php/Credits
 *
 * This program is free but copyrighted software; see
 *          the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include "inspircd.h"
#include <pcre.h>
#include "users.h"
#include "channels.h"
#include "modules.h"
#include "m_filter.h"

/* $ModDesc: m_filter with regexps */
/* $CompileFlags: exec("pcre-config --cflags") */
/* $LinkerFlags: exec("pcre-config --libs") rpath("pcre-config --libs") -lpcre */
/* $ModDep: m_filter.h */

#ifdef WINDOWS
#pragma comment(lib, "pcre.lib")
#endif

class PCREFilter : public FilterResult
{
 public:
         pcre* regexp;

         PCREFilter(pcre* r, const std::string &rea, const std::string &act, long glinetime, const std::string &pat, const std::string &flgs)
                 : FilterResult(pat, rea, act, glinetime, flgs), regexp(r)
         {
         }

         PCREFilter()
         {
         }
};

class ModuleFilterPCRE : public FilterBase
{
        std::vector<PCREFilter> filters;
        pcre *re;
        const char *error;
        int erroffset;
        PCREFilter fr;

 public:
        ModuleFilterPCRE(InspIRCd* Me)
        : FilterBase(Me, "m_filter_pcre.so")
        {
                OnRehash(NULL,"");

        }

        virtual ~ModuleFilterPCRE()
        {
        }

        virtual FilterResult* FilterMatch(User* user, const std::string &text, int flgs)
        {
                for (std::vector<PCREFilter>::iterator index = filters.begin(); index != filters.end(); index++)
                {
                        /* Skip ones that dont apply to us */

                        if (!FilterBase::AppliesToMe(user, dynamic_cast<FilterResult*>(&(*index)), flgs))
                                continue;

                        if (pcre_exec(index->regexp, NULL, text.c_str(), text.length(), 0, 0, NULL, 0) > -1)
                        {
                                fr = *index;
                                if (index != filters.begin())
                                {
                                        filters.erase(index);
                                        filters.insert(filters.begin(), fr);
                                }
                                return &fr;
                        }
                }
                return NULL;
        }

        virtual bool DeleteFilter(const std::string &freeform)
        {
                for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
                {
                        if (i->freeform == freeform)
                        {
                                pcre_free((*i).regexp);
                                filters.erase(i);
                                return true;
                        }
                }
                return false;
        }

        virtual void SyncFilters(Module* proto, void* opaque)
        {
                for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
                {
                        this->SendFilter(proto, opaque, &(*i));
                }
        }

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

                re = pcre_compile(freeform.c_str(),0,&error,&erroffset,NULL);

                if (!re)
                {
                        ServerInstance->Logs->Log("m_filter_pcre", DEFAULT,"Error in regular expression: %s at offset %d: %s\n", freeform.c_str(), erroffset, error);
                        ServerInstance->Logs->Log("m_filter_pcre", DEFAULT,"Regular expression %s not loaded.", freeform.c_str());
                        return std::make_pair(false, "Error in regular expression at offset " + ConvToStr(erroffset) + ": "+error);
                }
                else
                {
                        filters.push_back(PCREFilter(re, reason, type, duration, freeform, flgs));
                        return std::make_pair(true, "");
                }
        }

        virtual void OnRehash(User* user, const std::string &parameter)
        {
                ConfigReader MyConf(ServerInstance);

                for (int index = 0; index < MyConf.Enumerate("keyword"); index++)
                {
                        this->DeleteFilter(MyConf.ReadValue("keyword", "pattern", 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);
                        std::string flgs = MyConf.ReadValue("keyword", "flags", index);
                        long gline_time = ServerInstance->Duration(MyConf.ReadValue("keyword", "duration", index));
                        if (action.empty())
                                action = "none";
                        if (flgs.empty())
                                flgs = "*";

                        re = pcre_compile(pattern.c_str(),0,&error,&erroffset,NULL);

                        if (!re)
                        {
                                ServerInstance->Logs->Log("CONFIG",DEFAULT,"Error in regular expression: %s at offset %d: %s\n", pattern.c_str(), erroffset, error);
                                ServerInstance->Logs->Log("CONFIG",DEFAULT,"Regular expression %s not loaded.", pattern.c_str());
                        }
                        else
                        {
                                filters.push_back(PCREFilter(re, reason, action, gline_time, pattern, flgs));
                                ServerInstance->Logs->Log("CONFIG",DEFAULT,"Regular expression %s loaded.", pattern.c_str());
                        }
                }
                FilterBase::OnRehash(user, parameter);
        }

        virtual int OnStats(char symbol, User* user, string_list &results)
        {
                if (symbol == 's')
                {
                        std::string sn = ServerInstance->Config->ServerName;
                        for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
                        {
                                results.push_back(sn+" 223 "+user->nick+" :REGEXP:"+i->freeform+" "+i->flags+" "+i->action+" "+ConvToStr(i->gline_time)+" :"+i->reason);
                        }
                        for (std::vector<std::string>::iterator i = exemptfromfilter.begin(); i != exemptfromfilter.end(); ++i)
                        {
                                results.push_back(sn+" 223 "+user->nick+" :EXEMPT "+(*i));
                        }
                }
                return 0;
        }
};

MODULE_INIT(ModuleFilterPCRE)