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 MsgFlood : public ModeHandler
  87 {
  88  public:
  89         MsgFlood() : ModeHandler('f', 1, 0, false, MODETYPE_CHANNEL, false) { }
  90
  91         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
  92         {
  93                 if (adding)
  94                 {
  95                         char ndata[MAXBUF];
  96                         char* data = ndata;
  97                         strlcpy(ndata,parameter.c_str(),MAXBUF);
  98                         char* lines = data;
  99                         char* secs = NULL;
 100                         bool ban = false;
 101                         if (*data == '*')
 102                         {
 103                                 ban = true;
 104                                 lines++;
 105                         }
 106                         else
 107                         {
 108                                 ban = false;
 109                         }
 110                         while (*data)
 111                         {
 112                                 if (*data == ':')
 113                                 {
 114                                         *data = 0;
 115                                         data++;
 116                                         secs = data;
 117                                         break;
 118                                 }
 119                                 else data++;
 120                         }
 121                         if (secs)
 122                         {
 123                                 /* Set up the flood parameters for this channel */
 124                                 int nlines = atoi(lines);
 125                                 int nsecs = atoi(secs);
 126                                 if ((nlines<1) || (nsecs<1))
 127                                 {
 128                                         WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 129                                         parameter = "";
 130                                         return MODEACTION_DENY;
 131                                 }
 132                                 else
 133                                 {
 134                                         if (!channel->GetExt("flood"))
 135                                         {
 136                                                 parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 137                                                 floodsettings *f = new floodsettings(ban,nsecs,nlines);
 138                                                 channel->Extend("flood",(char*)f);
 139                                                 channel->SetMode('f', true);
 140                                                 channel->SetModeParam('f', parameter.c_str(), true);
 141                                                 return MODEACTION_ALLOW;
 142                                         }
 143                                 }
 144                         }
 145                         else
 146                         {
 147                                 WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 148                                 parameter = "";
 149                                 return MODEACTION_DENY;
 150                         }
 151                 }
 152                 else
 153                 {
 154                         if (channel->GetExt("flood"))
 155                         {
 156                                 floodsettings *f = (floodsettings*)channel->GetExt("flood");
 157                                 DELETE(f);
 158                                 channel->Shrink("flood");
 159                                 channel->SetMode('f', false);
 160                                 return MODEACTION_ALLOW;
 161                         }
 162                 }
 163
 164                 return MODEACTION_DENY;
 165         }
 166 };
 167
 168 class ModuleMsgFlood : public Module
 169 {
 170         Server *Srv;
 171         MsgFlood* mf;
 172
 173  public:
 174
 175         ModuleMsgFlood(Server* Me)
 176                 : Module::Module(Me)
 177         {
 178                 Srv = Me;
 179                 mf = new MsgFlood();
 180                 Srv->AddMode(mf, 'f');
 181         }
 182
 183         void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
 184         {
 185                 if (IS_LOCAL(user))
 186                 {
 187                         floodsettings *f = (floodsettings*)dest->GetExt("flood");
 188                         if (f)
 189                         {
 190                                 f->addmessage(user);
 191                                 if (f->shouldkick(user))
 192                                 {
 193                                         /* Youre outttta here! */
 194                                         f->clear(user);
 195                                         if (f->ban)
 196                                         {
 197                                                 char* parameters[3];
 198                                                 parameters[0] = dest->name;
 199                                                 parameters[1] = "+b";
 200                                                 parameters[2] = user->MakeWildHost();
 201                                                 Srv->SendMode(parameters,3,user);
 202                                                 std::deque<std::string> n;
 203                                                 /* Propogate the ban to other servers.
 204                                                  * We dont know what protocol we may be using,
 205                                                  * so this event is picked up by our protocol
 206                                                  * module and formed into a ban command that
 207                                                  * suits the protocol in use.
 208                                                  */
 209                                                 n.push_back(dest->name);
 210                                                 n.push_back("+b");
 211                                                 n.push_back(user->MakeWildHost());
 212                                                 Event rmode((char *)&n, NULL, "send_mode");
 213                                                 rmode.Send();
 214                                         }
 215                                         Srv->KickUser(NULL, user, dest, "Channel flood triggered (mode +f)");
 216                                 }
 217                         }
 218                 }
 219         }
 220
 221         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status)
 222         {
 223                 if (target_type == TYPE_CHANNEL)
 224                 {
 225                         ProcessMessages(user,(chanrec*)dest,text);
 226                 }
 227         }
 228
 229         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status)
 230         {
 231                 if (target_type == TYPE_CHANNEL)
 232                 {
 233                         ProcessMessages(user,(chanrec*)dest,text);
 234                 }
 235         }
 236
 237         void OnChannelDelete(chanrec* chan)
 238         {
 239                 if (chan->GetExt("flood"))
 240                 {
 241                         floodsettings *f = (floodsettings*)chan->GetExt("flood");
 242                         DELETE(f);
 243                         chan->Shrink("flood");
 244                 }
 245         }
 246
 247         void Implements(char* List)
 248         {
 249                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserNotice] = List[I_OnUserMessage] = 1;
 250         }
 251
 252         virtual void On005Numeric(std::string &output)
 253         {
 254                 InsertMode(output, "f", 3);
 255         }
 256
 257         virtual ~ModuleMsgFlood()
 258         {
 259                 DELETE(mf);
 260         }
 261
 262         virtual Version GetVersion()
 263         {
 264                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 265         }
 266 };
 267
 268
 269 class ModuleMsgFloodFactory : public ModuleFactory
 270 {
 271  public:
 272         ModuleMsgFloodFactory()
 273         {
 274         }
 275
 276         ~ModuleMsgFloodFactory()
 277         {
 278         }
 279
 280         virtual Module * CreateModule(Server* Me)
 281         {
 282                 return new ModuleMsgFlood(Me);
 283         }
 284
 285 };
 286
 287
 288 extern "C" void * init_module( void )
 289 {
 290         return new ModuleMsgFloodFactory;
 291 }
 292