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 : public classbase
  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         std::pair<bool,std::string> ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
  92         {
  93                 floodsettings* x;
  94                 if (channel->GetExt("flood",x))
  95                         return std::make_pair(true, (x->ban ? "*" : "")+ConvToStr(x->lines)+":"+ConvToStr(x->secs));
  96                 else
  97                         return std::make_pair(false, parameter);
  98         }
  99
 100         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 101         {
 102                 floodsettings *f;
 103
 104                 if (adding)
 105                 {
 106                         char ndata[MAXBUF];
 107                         char* data = ndata;
 108                         strlcpy(ndata,parameter.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(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 140                                         parameter = "";
 141                                         return MODEACTION_DENY;
 142                                 }
 143                                 else
 144                                 {
 145                                         if (!channel->GetExt("flood", f))
 146                                         {
 147                                                 parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 148                                                 floodsettings *f = new floodsettings(ban,nsecs,nlines);
 149                                                 channel->Extend("flood",f);
 150                                                 channel->SetMode('f', true);
 151                                                 channel->SetModeParam('f', parameter.c_str(), true);
 152                                                 return MODEACTION_ALLOW;
 153                                         }
 154                                 }
 155                         }
 156                         else
 157                         {
 158                                 WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 159                                 parameter = "";
 160                                 return MODEACTION_DENY;
 161                         }
 162                 }
 163                 else
 164                 {
 165                         if (channel->GetExt("flood", f))
 166                         {
 167                                 DELETE(f);
 168                                 channel->Shrink("flood");
 169                                 channel->SetMode('f', false);
 170                                 return MODEACTION_ALLOW;
 171                         }
 172                 }
 173
 174                 return MODEACTION_DENY;
 175         }
 176 };
 177
 178 class ModuleMsgFlood : public Module
 179 {
 180         Server *Srv;
 181         MsgFlood* mf;
 182
 183  public:
 184
 185         ModuleMsgFlood(Server* Me)
 186                 : Module::Module(Me)
 187         {
 188                 Srv = Me;
 189                 mf = new MsgFlood();
 190                 Srv->AddMode(mf, 'f');
 191         }
 192
 193         void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
 194         {
 195                 if (IS_LOCAL(user))
 196                 {
 197                         floodsettings *f;
 198                         if (dest->GetExt("flood", f))
 199                         {
 200                                 f->addmessage(user);
 201                                 if (f->shouldkick(user))
 202                                 {
 203                                         /* Youre outttta here! */
 204                                         f->clear(user);
 205                                         if (f->ban)
 206                                         {
 207                                                 const char* parameters[3];
 208                                                 parameters[0] = dest->name;
 209                                                 parameters[1] = "+b";
 210                                                 parameters[2] = user->MakeWildHost();
 211                                                 Srv->SendMode(parameters,3,user);
 212                                                 std::deque<std::string> n;
 213                                                 /* Propogate the ban to other servers.
 214                                                  * We dont know what protocol we may be using,
 215                                                  * so this event is picked up by our protocol
 216                                                  * module and formed into a ban command that
 217                                                  * suits the protocol in use.
 218                                                  */
 219                                                 n.push_back(dest->name);
 220                                                 n.push_back("+b");
 221                                                 n.push_back(user->MakeWildHost());
 222                                                 Event rmode((char *)&n, NULL, "send_mode");
 223                                                 rmode.Send();
 224                                         }
 225                                         Srv->KickUser(NULL, user, dest, "Channel flood triggered (mode +f)");
 226                                 }
 227                         }
 228                 }
 229         }
 230
 231         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status)
 232         {
 233                 if (target_type == TYPE_CHANNEL)
 234                 {
 235                         ProcessMessages(user,(chanrec*)dest,text);
 236                 }
 237         }
 238
 239         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status)
 240         {
 241                 if (target_type == TYPE_CHANNEL)
 242                 {
 243                         ProcessMessages(user,(chanrec*)dest,text);
 244                 }
 245         }
 246
 247         void OnChannelDelete(chanrec* chan)
 248         {
 249                 floodsettings* f;
 250                 if (chan->GetExt("flood", f))
 251                 {
 252                         DELETE(f);
 253                         chan->Shrink("flood");
 254                 }
 255         }
 256
 257         void Implements(char* List)
 258         {
 259                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserNotice] = List[I_OnUserMessage] = 1;
 260         }
 261
 262         virtual void On005Numeric(std::string &output)
 263         {
 264                 InsertMode(output, "f", 3);
 265         }
 266
 267         virtual ~ModuleMsgFlood()
 268         {
 269                 DELETE(mf);
 270         }
 271
 272         virtual Version GetVersion()
 273         {
 274                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 275         }
 276 };
 277
 278
 279 class ModuleMsgFloodFactory : public ModuleFactory
 280 {
 281  public:
 282         ModuleMsgFloodFactory()
 283         {
 284         }
 285
 286         ~ModuleMsgFloodFactory()
 287         {
 288         }
 289
 290         virtual Module * CreateModule(Server* Me)
 291         {
 292                 return new ModuleMsgFlood(Me);
 293         }
 294
 295 };
 296
 297
 298 extern "C" void * init_module( void )
 299 {
 300         return new ModuleMsgFloodFactory;
 301 }
 302