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                         log(DEBUG,"should kick? %d, %d",iter->second,this->lines);
  71                         return (iter->second >= this->lines);
  72                 }
  73                 else return false;
  74         }
  75
  76         void clear(userrec* who)
  77         {
  78                 std::map<userrec*,int>::iterator iter = counters.find(who);
  79                 if (iter != counters.end())
  80                 {
  81                         counters.erase(iter);
  82                 }
  83         }
  84 };
  85
  86 class ModuleMsgFlood : public Module
  87 {
  88         Server *Srv;
  89
  90  public:
  91
  92         ModuleMsgFlood(Server* Me)
  93                 : Module::Module(Me)
  94         {
  95                 Srv = Me;
  96                 Srv->AddExtendedMode('f',MT_CHANNEL,false,1,0);
  97         }
  98
  99         virtual int OnExtendedMode(userrec* user, void* target, char modechar, int type, bool mode_on, string_list &params)
 100         {
 101                 if ((modechar == 'f') && (type == MT_CHANNEL))
 102                 {
 103                         if (mode_on)
 104                         {
 105                                 std::string FloodParams = params[0];
 106                                 chanrec* c = (chanrec*)target;
 107                                 char ndata[MAXBUF];
 108                                 char* data = ndata;
 109                                 strlcpy(ndata,FloodParams.c_str(),MAXBUF);
 110                                 char* lines = data;
 111                                 char* secs = NULL;
 112                                 bool ban = false;
 113                                 if (*data == '*')
 114                                 {
 115                                         ban = true;
 116                                         lines++;
 117                                 }
 118                                 else
 119                                 {
 120                                         ban = false;
 121                                 }
 122                                 while (*data)
 123                                 {
 124                                         if (*data == ':')
 125                                         {
 126                                                 *data = 0;
 127                                                 data++;
 128                                                 secs = data;
 129                                                 break;
 130                                         }
 131                                         else data++;
 132                                 }
 133                                 if (secs)
 134                                 {
 135                                         /* Set up the flood parameters for this channel */
 136                                         int nlines = atoi(lines);
 137                                         int nsecs = atoi(secs);
 138                                         if ((nlines<1) || (nsecs<1))
 139                                         {
 140                                                 WriteServ(user->fd,"608 %s %s :Invalid flood parameter",user->nick,c->name);
 141                                                 return 0;
 142                                         }
 143                                         else
 144                                         {
 145                                                 if (!c->GetExt("flood"))
 146                                                 {
 147                                                         floodsettings *f = new floodsettings(ban,nsecs,nlines);
 148                                                         c->Extend("flood",(char*)f);
 149                                                 }
 150                                         }
 151                                         return 1;
 152                                 }
 153                                 else
 154                                 {
 155                                         WriteServ(user->fd,"608 %s %s :Invalid flood parameter",user->nick,c->name);
 156                                         return 0;
 157                                 }
 158
 159                         }
 160                         else
 161                         {
 162                                 chanrec* c = (chanrec*)target;
 163                                 if (c->GetExt("flood"))
 164                                 {
 165                                         floodsettings *f = (floodsettings*)c->GetExt("flood");
 166                                         DELETE(f);
 167                                         c->Shrink("flood");
 168                                 }
 169                         }
 170                         return 1;
 171                 }
 172                 return 0;
 173         }
 174
 175         void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
 176         {
 177                 if (IS_LOCAL(user))
 178                 {
 179                         floodsettings *f = (floodsettings*)dest->GetExt("flood");
 180                         if (f)
 181                         {
 182                                 f->addmessage(user);
 183                                 if (f->shouldkick(user))
 184                                 {
 185                                         /* Youre outttta here! */
 186                                         f->clear(user);
 187                                         if (f->ban)
 188                                         {
 189                                                 char* parameters[3];
 190                                                 parameters[0] = dest->name;
 191                                                 parameters[1] = "+b";
 192                                                 parameters[2] = user->MakeWildHost();
 193                                                 Srv->SendMode(parameters,3,user);
 194                                         }
 195                                         Srv->KickUser(NULL, user, dest, "Channel flood triggered (mode +f)");
 196                                 }
 197                         }
 198                 }
 199         }
 200
 201         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status)
 202         {
 203                 if (target_type == TYPE_CHANNEL)
 204                 {
 205                         ProcessMessages(user,(chanrec*)dest,text);
 206                 }
 207         }
 208
 209         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status)
 210         {
 211                 if (target_type == TYPE_CHANNEL)
 212                 {
 213                         ProcessMessages(user,(chanrec*)dest,text);
 214                 }
 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_OnUserNotice] = List[I_OnUserMessage] = 1;
 230         }
 231
 232         virtual void On005Numeric(std::string &output)
 233         {
 234                 InsertMode(output, "f", 3);
 235         }
 236
 237         virtual ~ModuleMsgFlood()
 238         {
 239         }
 240
 241         virtual Version GetVersion()
 242         {
 243                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 244         }
 245 };
 246
 247
 248 class ModuleMsgFloodFactory : public ModuleFactory
 249 {
 250  public:
 251         ModuleMsgFloodFactory()
 252         {
 253         }
 254
 255         ~ModuleMsgFloodFactory()
 256         {
 257         }
 258
 259         virtual Module * CreateModule(Server* Me)
 260         {
 261                 return new ModuleMsgFlood(Me);
 262         }
 263
 264 };
 265
 266
 267 extern "C" void * init_module( void )
 268 {
 269         return new ModuleMsgFloodFactory;
 270 }
 271