src/modules/m_messageflood.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 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 using namespace std;
  18
  19 #include <stdio.h>
  20 #include <map>
  21 #include "users.h"
  22 #include "channels.h"
  23 #include "modules.h"
  24 #include "helperfuncs.h"
  25
  26 /* $ModDesc: Provides channel mode +f (message flood protection) */
  27
  28 class floodsettings
  29 {
  30  public:
  31         bool ban;
  32         int secs;
  33         int lines;
  34         time_t reset;
  35         std::map<userrec*,int> counters;
  36
  37         floodsettings() : ban(0), secs(0), lines(0) {};
  38         floodsettings(bool a, int b, int c) : ban(a), secs(b), lines(c)
  39         {
  40                 reset = time(NULL) + secs;
  41                 log(DEBUG,"Create new floodsettings: %lu %lu",time(NULL),reset);
  42         };
  43
  44         void addmessage(userrec* who)
  45         {
  46                 std::map<userrec*,int>::iterator iter = counters.find(who);
  47                 if (iter != counters.end())
  48                 {
  49                         iter->second++;
  50                         log(DEBUG,"Count for %s is now %d",who->nick,iter->second);
  51                 }
  52                 else
  53                 {
  54                         counters[who] = 1;
  55                         log(DEBUG,"Count for %s is now *1*",who->nick);
  56                 }
  57                 if (time(NULL) > reset)
  58                 {
  59                         log(DEBUG,"floodsettings timer Resetting.");
  60                         counters.clear();
  61                         reset = time(NULL) + secs;
  62                 }
  63         }
  64
  65         bool shouldkick(userrec* who)
  66         {
  67                 std::map<userrec*,int>::iterator iter = counters.find(who);
  68                 if (iter != counters.end())
  69                 {
  70                         return (iter->second >= this->lines);
  71                 }
  72                 else return false;
  73         }
  74
  75         void clear(userrec* who)
  76         {
  77                 std::map<userrec*,int>::iterator iter = counters.find(who);
  78                 if (iter != counters.end())
  79                 {
  80                         counters.erase(iter);
  81                 }
  82         }
  83 };
  84
  85 class ModuleMsgFlood : public Module
  86 {
  87         Server *Srv;
  88
  89  public:
  90
  91         ModuleMsgFlood(Server* Me)
  92                 : Module::Module(Me)
  93         {
  94                 Srv = Me;
  95                 Srv->AddExtendedMode('f',MT_CHANNEL,false,1,0);
  96         }
  97
  98         virtual int OnExtendedMode(userrec* user, void* target, char modechar, int type, bool mode_on, string_list &params)
  99         {
 100                 if ((modechar == 'f') && (type == MT_CHANNEL))
 101                 {
 102                         if (mode_on)
 103                         {
 104                                 std::string FloodParams = params[0];
 105                                 chanrec* c = (chanrec*)target;
 106                                 char ndata[MAXBUF];
 107                                 char* data = ndata;
 108                                 strlcpy(ndata,FloodParams.c_str(),MAXBUF);
 109                                 char* lines = data;
 110                                 char* secs = NULL;
 111                                 bool ban = false;
 112                                 if (*data == '*')
 113                                 {
 114                                         ban = true;
 115                                         lines++;
 116                                 }
 117                                 else
 118                                 {
 119                                         ban = false;
 120                                 }
 121                                 while (*data)
 122                                 {
 123                                         if (*data == ':')
 124                                         {
 125                                                 *data = 0;
 126                                                 data++;
 127                                                 secs = data;
 128                                                 break;
 129                                         }
 130                                         else data++;
 131                                 }
 132                                 if (secs)
 133                                 {
 134                                         /* Set up the flood parameters for this channel */
 135                                         int nlines = atoi(lines);
 136                                         int nsecs = atoi(secs);
 137                                         if ((nlines<1) || (nsecs<1))
 138                                         {
 139                                                 WriteServ(user->fd,"608 %s %s :Invalid flood parameter",user->nick,c->name);
 140                                                 return 0;
 141                                         }
 142                                         else
 143                                         {
 144                                                 if (!c->GetExt("flood"))
 145                                                 {
 146                                                         floodsettings *f = new floodsettings(ban,nlines,nsecs);
 147                                                         c->Extend("flood",(char*)f);
 148                                                 }
 149                                         }
 150                                         return 1;
 151                                 }
 152                                 else
 153                                 {
 154                                         WriteServ(user->fd,"608 %s %s :Invalid flood parameter",user->nick,c->name);
 155                                         return 0;
 156                                 }
 157
 158                         }
 159                         else
 160                         {
 161                                 chanrec* c = (chanrec*)target;
 162                                 if (c->GetExt("flood"))
 163                                 {
 164                                         floodsettings *f = (floodsettings*)c->GetExt("flood");
 165                                         delete f;
 166                                         c->Shrink("flood");
 167                                 }
 168                         }
 169                         return 1;
 170                 }
 171                 return 0;
 172         }
 173
 174         int ProcessMessages(userrec* user,chanrec* dest,std::string &text)
 175         {
 176                 floodsettings *f = (floodsettings*)dest->GetExt("flood");
 177                 if (f)
 178                 {
 179                         f->addmessage(user);
 180                         if (f->shouldkick(user))
 181                         {
 182                                 /* Youre outttta here! */
 183                                 f->clear(user);
 184                                 if (f->ban)
 185                                 {
 186                                         char* parameters[3];
 187                                         parameters[0] = dest->name;
 188                                         parameters[1] = "+b";
 189                                         parameters[2] = user->MakeWildHost();
 190                                         Srv->SendMode(parameters,3,user);
 191                                 }
 192                                 Srv->KickUser(NULL, user, dest, "Channel flood triggered (mode +f)");
 193                                 return 1;
 194                         }
 195                 }
 196                 return 0;
 197         }
 198
 199         virtual int OnUserPreMessage(userrec* user,void* dest,int target_type, std::string &text)
 200         {
 201                 if (target_type == TYPE_CHANNEL)
 202                 {
 203                         return ProcessMessages(user,(chanrec*)dest,text);
 204                 }
 205                 else return 0;
 206         }
 207
 208         virtual int OnUserPreNotice(userrec* user,void* dest,int target_type, std::string &text)
 209         {
 210                 if (target_type == TYPE_CHANNEL)
 211                 {
 212                         return ProcessMessages(user,(chanrec*)dest,text);
 213                 }
 214                 else return 0;
 215         }
 216
 217         void OnChannelDelete(chanrec* chan)
 218         {
 219                 if (chan->GetExt("flood"))
 220                 {
 221                         floodsettings *f = (floodsettings*)chan->GetExt("flood");
 222                         delete f;
 223                         chan->Shrink("flood");
 224                 }
 225         }
 226
 227         void Implements(char* List)
 228         {
 229                 List[I_On005Numeric] = List[I_OnExtendedMode] = List[I_OnChannelDelete] = List[I_OnUserPreNotice] = List[I_OnUserPreMessage] = 1;
 230         }
 231
 232         virtual void On005Numeric(std::string &output)
 233         {
 234                 std::stringstream line(output);
 235                 std::string temp1, temp2;
 236                 while (!line.eof())
 237                 {
 238                         line >> temp1;
 239                         if (temp1.substr(0,10) == "CHANMODES=")
 240                         {
 241                                 // By doing this we're *assuming* no other module has fucked up the CHANMODES=
 242                                 // section of the 005 numeric. If they have, we're going DOWN in a blaze of glory,
 243                                 // with a honking great EXCEPTION :)
 244                                 temp1.insert(temp1.find(",")+1,"f");
 245                         }
 246                         temp2 = temp2 + temp1 + " ";
 247                 }
 248                 if (temp2.length())
 249                         output = temp2.substr(0,temp2.length()-1);
 250         }
 251
 252         virtual ~ModuleMsgFlood()
 253         {
 254         }
 255
 256         virtual Version GetVersion()
 257         {
 258                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 259         }
 260 };
 261
 262
 263 class ModuleMsgFloodFactory : public ModuleFactory
 264 {
 265  public:
 266         ModuleMsgFloodFactory()
 267         {
 268         }
 269
 270         ~ModuleMsgFloodFactory()
 271         {
 272         }
 273
 274         virtual Module * CreateModule(Server* Me)
 275         {
 276                 return new ModuleMsgFlood(Me);
 277         }
 278
 279 };
 280
 281
 282 extern "C" void * init_module( void )
 283 {
 284         return new ModuleMsgFloodFactory;
 285 }
 286