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

m_regex_posix.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 "m_regex.h"
#include <sys/types.h>
#include <regex.h>

/* $ModDesc: Regex Provider Module for POSIX Regular Expressions */
/* $ModDep: m_regex.h */

class POSIXRegexException : public ModuleException
{
public:
        POSIXRegexException(const std::string& rx, const std::string& error)
                : ModuleException(std::string("Error in regex ") + rx + ": " + error)
        {
        }
};

class POSIXRegex : public Regex
{
private:
        regex_t regbuf;

public:
        POSIXRegex(const std::string& rx, InspIRCd* Me, bool extended) : Regex(rx, Me)
        {
                int flags = (extended ? REG_EXTENDED : 0) | REG_NOSUB;
                int errcode;
                errcode = regcomp(&regbuf, rx.c_str(), flags);
                if (errcode)
                {
                        // Get the error string into a std::string. YUCK this involves at least 2 string copies.
                        std::string error;
                        char* errbuf;
                        size_t sz = regerror(errcode, &regbuf, NULL, 0);
                        errbuf = new char[sz + 1];
                        memset(errbuf, 0, sz + 1);
                        regerror(errcode, &regbuf, errbuf, sz + 1);
                        error = errbuf;
                        delete[] errbuf;
                        regfree(&regbuf);
                        throw POSIXRegexException(rx, error);
                }
        }

        virtual ~POSIXRegex()
        {
                regfree(&regbuf);
        }

        virtual bool Matches(const std::string& text)
        {
                if (regexec(&regbuf, text.c_str(), 0, NULL, 0) == 0)
                {
                        // Bang. :D
                        return true;
                }
                return false;
        }
};

class ModuleRegexPOSIX : public Module
{
private:
        bool extended;
public:
        ModuleRegexPOSIX(InspIRCd* Me) : Module(Me)
        {
                Me->Modules->PublishInterface("RegularExpression", this);
                Implementation eventlist[] = { I_OnRequest, I_OnRehash };
                Me->Modules->Attach(eventlist, this, 2);
                OnRehash(NULL, "");
        }

        virtual Version GetVersion()
        {
                return Version("$Id: m_regex_posix.cpp 10593 2008-09-22 15:22:15Z brain $", VF_COMMON | VF_VENDOR | VF_SERVICEPROVIDER, API_VERSION);
        }

        virtual ~ModuleRegexPOSIX()
        {
                ServerInstance->Modules->UnpublishInterface("RegularExpression", this);
        }

        virtual void OnRehash(User* u, const std::string& parameter)
        {
                ConfigReader Conf(ServerInstance);
                extended = Conf.ReadFlag("posix", "extended", 0);
        }

        virtual const char* OnRequest(Request* request)
        {
                if (strcmp("REGEX-NAME", request->GetId()) == 0)
                {
                        return "posix";
                }
                else if (strcmp("REGEX", request->GetId()) == 0)
                {
                        RegexFactoryRequest* rfr = (RegexFactoryRequest*)request;
                        std::string rx = rfr->GetRegex();
                        rfr->result = new POSIXRegex(rx, ServerInstance, extended);
                        return "OK";
                }
                return NULL;
        }
};

MODULE_INIT(ModuleRegexPOSIX)