src/modules/extra/m_filter_pcre.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2004 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 // Message and notice filtering using regex patterns
  18 // a module based on the original work done by Craig Edwards in 2003
  19 // for the chatspike network.
  20
  21 #include <stdio.h>
  22 #include <string>
  23 #include <pcre.h>
  24 #include "users.h"
  25 #include "channels.h"
  26 #include "modules.h"
  27 #include "inspircd.h"
  28 #include "m_filter.h"
  29
  30 /* $ModDesc: m_filter with regexps */
  31 /* $CompileFlags: `pcre-config --cflags` */
  32 /* $LinkerFlags: `pcre-config --libs` `perl extra/pcre_rpath.pl` -lpcre */
  33 /* $ModDep: ../m_filter.h */
  34
  35 class PCREFilter : public FilterResult
  36 {
  37  public:
  38          pcre* regexp;
  39
  40          PCREFilter(pcre* r, const std::string &rea, const std::string &act)
  41                  : FilterResult::FilterResult(rea, act), regexp(r)
  42          {
  43          }
  44 };
  45
  46 class ModuleFilterPCRE : public FilterBase
  47 {
  48         std::vector<PCREFilter> filters;
  49         pcre *re;
  50         const char *error;
  51         int erroffset;
  52
  53  public:
  54         ModuleFilterPCRE(InspIRCd* Me)
  55         : FilterBase::FilterBase(Me)
  56         {
  57                 OnRehash("");
  58         }
  59
  60         virtual ~ModuleFilterPCRE()
  61         {
  62         }
  63
  64         virtual FilterResult* FilterMatch(const std::string &text)
  65         {
  66                 for (unsigned int index = 0; index < filters.size(); index++)
  67                 {
  68                         PCREFilter& filt = filters[index];
  69
  70                         if (pcre_exec(filt.regexp,NULL,text.c_str(),text.length(),0,0,NULL,0) > -1)
  71                         {
  72                                 return &filt;
  73                         }
  74                 }
  75                 return NULL;
  76         }
  77
  78         virtual void OnRehash(const std::string &parameter)
  79         {
  80                 ConfigReader MyConf(ServerInstance);
  81
  82                 for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
  83                         pcre_free((*i).regexp);
  84
  85                 filters.clear();
  86
  87                 for (int index = 0; index < MyConf.Enumerate("keyword"); index++)
  88                 {
  89                         std::string pattern = MyConf.ReadValue("keyword","pattern",index);
  90                         std::string reason = MyConf.ReadValue("keyword","reason",index);
  91                         std::string action = MyConf.ReadValue("keyword","action",index);
  92
  93                         re = pcre_compile(pattern.c_str(),0,&error,&erroffset,NULL);
  94
  95                         if (!re)
  96                         {
  97                                 ServerInstance->Log(DEFAULT,"Error in regular expression: %s at offset %d: %s\n", pattern.c_str(), erroffset, error);
  98                                 ServerInstance->Log(DEFAULT,"Regular expression %s not loaded.", pattern.c_str());
  99                         }
 100                         else
 101                         {
 102                                 filters.push_back(PCREFilter(re, reason, action));
 103                                 ServerInstance->Log(DEFAULT,"Regular expression %s loaded.", pattern.c_str());
 104                         }
 105                 }
 106         }
 107 };
 108
 109
 110 class ModuleFilterPCREFactory : public ModuleFactory
 111 {
 112  public:
 113         ModuleFilterPCREFactory()
 114         {
 115         }
 116
 117         ~ModuleFilterPCREFactory()
 118         {
 119         }
 120
 121         virtual Module * CreateModule(InspIRCd* Me)
 122         {
 123                 return new ModuleFilterPCRE(Me);
 124         }
 125
 126 };
 127
 128
 129 extern "C" void * init_module( void )
 130 {
 131         return new ModuleFilterPCREFactory;
 132 }