src/modules/extra/m_filter_pcre.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *          the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include <stdio.h>
  15 #include <string>
  16 #include <pcre.h>
  17 #include "users.h"
  18 #include "channels.h"
  19 #include "modules.h"
  20 #include "inspircd.h"
  21 #include "m_filter.h"
  22
  23 /* $ModDesc: m_filter with regexps */
  24 /* $CompileFlags: exec("pcre-config --cflags") */
  25 /* $LinkerFlags: exec("pcre-config --libs") rpath("pcre-config --libs") -lpcre */
  26 /* $ModDep: m_filter.h */
  27
  28 class PCREFilter : public FilterResult
  29 {
  30  public:
  31          pcre* regexp;
  32
  33          PCREFilter(pcre* r, const std::string &rea, const std::string &act, long gline_time, const std::string &pat)
  34                  : FilterResult::FilterResult(pat, rea, act, gline_time), regexp(r)
  35          {
  36          }
  37 };
  38
  39 class ModuleFilterPCRE : public FilterBase
  40 {
  41         std::vector<PCREFilter> filters;
  42         pcre *re;
  43         const char *error;
  44         int erroffset;
  45
  46  public:
  47         ModuleFilterPCRE(InspIRCd* Me)
  48         : FilterBase::FilterBase(Me, "m_filter_pcre.so")
  49         {
  50                 OnRehash(NULL,"");
  51         }
  52
  53         virtual ~ModuleFilterPCRE()
  54         {
  55         }
  56
  57         virtual FilterResult* FilterMatch(const std::string &text)
  58         {
  59                 for (std::vector<PCREFilter>::iterator index = filters.begin(); index != filters.end(); index++)
  60                 {
  61                         if (pcre_exec(index->regexp, NULL, text.c_str(), text.length(), 0, 0, NULL, 0) > -1)
  62                         {
  63                                 PCREFilter* fr = &(*index);
  64                                 if (index != filters.begin())
  65                                 {
  66                                         filters.erase(index);
  67                                         filters.insert(filters.begin(), *fr);
  68                                         index = filters.begin();
  69                                 }
  70                                 return &(*index);
  71                         }
  72                 }
  73                 return NULL;
  74         }
  75
  76         virtual bool DeleteFilter(const std::string &freeform)
  77         {
  78                 for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
  79                 {
  80                         if (i->freeform == freeform)
  81                         {
  82                                 pcre_free((*i).regexp);
  83                                 filters.erase(i);
  84                                 return true;
  85                         }
  86                 }
  87                 return false;
  88         }
  89
  90         virtual void SyncFilters(Module* proto, void* opaque)
  91         {
  92                 for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
  93                 {
  94                         this->SendFilter(proto, opaque, &(*i));
  95                 }
  96         }
  97
  98         virtual std::pair<bool, std::string> AddFilter(const std::string &freeform, const std::string &type, const std::string &reason, long duration)
  99         {
 100                 for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 101                 {
 102                         if (i->freeform == freeform)
 103                         {
 104                                 return std::make_pair(false, "Filter already exists");
 105                         }
 106                 }
 107
 108                 re = pcre_compile(freeform.c_str(),0,&error,&erroffset,NULL);
 109
 110                 if (!re)
 111                 {
 112                         ServerInstance->Log(DEFAULT,"Error in regular expression: %s at offset %d: %s\n", freeform.c_str(), erroffset, error);
 113                         ServerInstance->Log(DEFAULT,"Regular expression %s not loaded.", freeform.c_str());
 114                         return std::make_pair(false, "Error in regular expression at offset " + ConvToStr(erroffset) + ": "+error);
 115                 }
 116                 else
 117                 {
 118                         filters.push_back(PCREFilter(re, reason, type, duration, freeform));
 119                         return std::make_pair(true, "");
 120                 }
 121         }
 122
 123         virtual void OnRehash(userrec* user, const std::string &parameter)
 124         {
 125                 ConfigReader MyConf(ServerInstance);
 126
 127                 for (int index = 0; index < MyConf.Enumerate("keyword"); index++)
 128                 {
 129                         this->DeleteFilter(MyConf.ReadValue("keyword", "pattern", index));
 130
 131                         std::string pattern = MyConf.ReadValue("keyword", "pattern", index);
 132                         std::string reason = MyConf.ReadValue("keyword", "reason", index);
 133                         std::string action = MyConf.ReadValue("keyword", "action", index);
 134                         long gline_time = ServerInstance->Duration(MyConf.ReadValue("keyword", "duration", index).c_str());
 135
 136                         re = pcre_compile(pattern.c_str(),0,&error,&erroffset,NULL);
 137
 138                         if (!re)
 139                         {
 140                                 ServerInstance->Log(DEFAULT,"Error in regular expression: %s at offset %d: %s\n", pattern.c_str(), erroffset, error);
 141                                 ServerInstance->Log(DEFAULT,"Regular expression %s not loaded.", pattern.c_str());
 142                         }
 143                         else
 144                         {
 145                                 filters.push_back(PCREFilter(re, reason, action, gline_time, pattern));
 146                                 ServerInstance->Log(DEFAULT,"Regular expression %s loaded.", pattern.c_str());
 147                         }
 148                 }
 149         }
 150
 151         virtual int OnStats(char symbol, userrec* user, string_list &results)
 152         {
 153                 if (symbol == 's')
 154                 {
 155                         std::string sn = ServerInstance->Config->ServerName;
 156                         for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 157                         {
 158                                 results.push_back(sn+" 223 "+user->nick+" :REGEXP:"+i->freeform+" "+i->action+" "+ConvToStr(i->gline_time)+" :"+i->reason);
 159                         }
 160                 }
 161                 return 0;
 162         }
 163 };
 164
 165
 166 class ModuleFilterPCREFactory : public ModuleFactory
 167 {
 168  public:
 169         ModuleFilterPCREFactory()
 170         {
 171         }
 172
 173         ~ModuleFilterPCREFactory()
 174         {
 175         }
 176
 177         virtual Module * CreateModule(InspIRCd* Me)
 178         {
 179                 return new ModuleFilterPCRE(Me);
 180         }
 181
 182 };
 183
 184
 185 extern "C" void * init_module( void )
 186 {
 187         return new ModuleFilterPCREFactory;
 188 }