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 "inspircd.h"
  15 #include <pcre.h>
  16 #include "users.h"
  17 #include "channels.h"
  18 #include "modules.h"
  19 #include "m_filter.h"
  20
  21 /* $ModDesc: m_filter with regexps */
  22 /* $CompileFlags: exec("pcre-config --cflags") */
  23 /* $LinkerFlags: exec("pcre-config --libs") rpath("pcre-config --libs") -lpcre */
  24 /* $ModDep: m_filter.h */
  25
  26 #ifdef WINDOWS
  27 #pragma comment(lib, "pcre.lib")
  28 #endif
  29
  30 class PCREFilter : public FilterResult
  31 {
  32  public:
  33          pcre* regexp;
  34
  35          PCREFilter(pcre* r, const std::string &rea, const std::string &act, long gline_time, const std::string &pat, const std::string &flags)
  36                  : FilterResult(pat, rea, act, gline_time, flags), regexp(r)
  37          {
  38          }
  39
  40          PCREFilter()
  41          {
  42          }
  43 };
  44
  45 class ModuleFilterPCRE : public FilterBase
  46 {
  47         std::vector<PCREFilter> filters;
  48         pcre *re;
  49         const char *error;
  50         int erroffset;
  51         PCREFilter fr;
  52
  53  public:
  54         ModuleFilterPCRE(InspIRCd* Me)
  55         : FilterBase(Me, "m_filter_pcre.so")
  56         {
  57                 OnRehash(NULL,"");
  58         }
  59
  60         virtual ~ModuleFilterPCRE()
  61         {
  62         }
  63
  64         virtual FilterResult* FilterMatch(User* user, const std::string &text, int flags)
  65         {
  66                 for (std::vector<PCREFilter>::iterator index = filters.begin(); index != filters.end(); index++)
  67                 {
  68                         /* Skip ones that dont apply to us */
  69
  70                         if (!FilterBase::AppliesToMe(user, dynamic_cast<FilterResult*>(&(*index)), flags))
  71                                 continue;
  72
  73                         if (pcre_exec(index->regexp, NULL, text.c_str(), text.length(), 0, 0, NULL, 0) > -1)
  74                         {
  75                                 fr = *index;
  76                                 if (index != filters.begin())
  77                                 {
  78                                         filters.erase(index);
  79                                         filters.insert(filters.begin(), fr);
  80                                 }
  81                                 return &fr;
  82                         }
  83                 }
  84                 return NULL;
  85         }
  86
  87         virtual bool DeleteFilter(const std::string &freeform)
  88         {
  89                 for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
  90                 {
  91                         if (i->freeform == freeform)
  92                         {
  93                                 pcre_free((*i).regexp);
  94                                 filters.erase(i);
  95                                 return true;
  96                         }
  97                 }
  98                 return false;
  99         }
 100
 101         virtual void SyncFilters(Module* proto, void* opaque)
 102         {
 103                 for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 104                 {
 105                         this->SendFilter(proto, opaque, &(*i));
 106                 }
 107         }
 108
 109         virtual std::pair<bool, std::string> AddFilter(const std::string &freeform, const std::string &type, const std::string &reason, long duration, const std::string &flags)
 110         {
 111                 for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 112                 {
 113                         if (i->freeform == freeform)
 114                         {
 115                                 return std::make_pair(false, "Filter already exists");
 116                         }
 117                 }
 118
 119                 re = pcre_compile(freeform.c_str(),0,&error,&erroffset,NULL);
 120
 121                 if (!re)
 122                 {
 123                         ServerInstance->Log(DEFAULT,"Error in regular expression: %s at offset %d: %s\n", freeform.c_str(), erroffset, error);
 124                         ServerInstance->Log(DEFAULT,"Regular expression %s not loaded.", freeform.c_str());
 125                         return std::make_pair(false, "Error in regular expression at offset " + ConvToStr(erroffset) + ": "+error);
 126                 }
 127                 else
 128                 {
 129                         filters.push_back(PCREFilter(re, reason, type, duration, freeform, flags));
 130                         return std::make_pair(true, "");
 131                 }
 132         }
 133
 134         virtual void OnRehash(User* user, const std::string &parameter)
 135         {
 136                 ConfigReader MyConf(ServerInstance);
 137
 138                 for (int index = 0; index < MyConf.Enumerate("keyword"); index++)
 139                 {
 140                         this->DeleteFilter(MyConf.ReadValue("keyword", "pattern", index));
 141
 142                         std::string pattern = MyConf.ReadValue("keyword", "pattern", index);
 143                         std::string reason = MyConf.ReadValue("keyword", "reason", index);
 144                         std::string action = MyConf.ReadValue("keyword", "action", index);
 145                         std::string flags = MyConf.ReadValue("keyword", "flags", index);
 146                         long gline_time = ServerInstance->Duration(MyConf.ReadValue("keyword", "duration", index));
 147                         if (action.empty())
 148                                 action = "none";
 149                         if (flags.empty())
 150                                 flags = "*";
 151
 152                         re = pcre_compile(pattern.c_str(),0,&error,&erroffset,NULL);
 153
 154                         if (!re)
 155                         {
 156                                 ServerInstance->Log(DEFAULT,"Error in regular expression: %s at offset %d: %s\n", pattern.c_str(), erroffset, error);
 157                                 ServerInstance->Log(DEFAULT,"Regular expression %s not loaded.", pattern.c_str());
 158                         }
 159                         else
 160                         {
 161                                 filters.push_back(PCREFilter(re, reason, action, gline_time, pattern, flags));
 162                                 ServerInstance->Log(DEFAULT,"Regular expression %s loaded.", pattern.c_str());
 163                         }
 164                 }
 165         }
 166
 167         virtual int OnStats(char symbol, User* user, string_list &results)
 168         {
 169                 if (symbol == 's')
 170                 {
 171                         std::string sn = ServerInstance->Config->ServerName;
 172                         for (std::vector<PCREFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 173                         {
 174                                 results.push_back(sn+" 223 "+user->nick+" :REGEXP:"+i->freeform+" "+i->flags+" "+i->action+" "+ConvToStr(i->gline_time)+" :"+i->reason);
 175                         }
 176                 }
 177                 return 0;
 178         }
 179 };
 180
 181 MODULE_INIT(ModuleFilterPCRE)
 182