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 "inspircd.h"
  25
  26 /* $ModDesc: Provides channel mode +f (message flood protection) */
  27
  28
  29
  30 class floodsettings : public classbase
  31 {
  32  public:
  33         bool ban;
  34         int secs;
  35         int lines;
  36         time_t reset;
  37         std::map<userrec*,int> counters;
  38
  39         floodsettings() : ban(0), secs(0), lines(0) {};
  40         floodsettings(bool a, int b, int c) : ban(a), secs(b), lines(c)
  41         {
  42                 reset = time(NULL) + secs;
  43         };
  44
  45         void addmessage(userrec* who)
  46         {
  47                 std::map<userrec*,int>::iterator iter = counters.find(who);
  48                 if (iter != counters.end())
  49                 {
  50                         iter->second++;
  51                 }
  52                 else
  53                 {
  54                         counters[who] = 1;
  55                 }
  56                 if (time(NULL) > reset)
  57                 {
  58                         counters.clear();
  59                         reset = time(NULL) + secs;
  60                 }
  61         }
  62
  63         bool shouldkick(userrec* who)
  64         {
  65                 std::map<userrec*,int>::iterator iter = counters.find(who);
  66                 if (iter != counters.end())
  67                 {
  68                         return (iter->second >= this->lines);
  69                 }
  70                 else return false;
  71         }
  72
  73         void clear(userrec* who)
  74         {
  75                 std::map<userrec*,int>::iterator iter = counters.find(who);
  76                 if (iter != counters.end())
  77                 {
  78                         counters.erase(iter);
  79                 }
  80         }
  81 };
  82
  83 class MsgFlood : public ModeHandler
  84 {
  85  public:
  86         MsgFlood(InspIRCd* Instance) : ModeHandler(Instance, 'f', 1, 0, false, MODETYPE_CHANNEL, false) { }
  87
  88         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
  89         {
  90                 floodsettings* x;
  91                 if (channel->GetExt("flood",x))
  92                         return std::make_pair(true, (x->ban ? "*" : "")+ConvToStr(x->lines)+":"+ConvToStr(x->secs));
  93                 else
  94                         return std::make_pair(false, parameter);
  95         }
  96
  97         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
  98         {
  99                 /* When TS is equal, the alphabetically later one wins */
 100                 return (their_param < our_param);
 101         }
 102
 103         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 104         {
 105                 floodsettings *f;
 106
 107                 if (adding)
 108                 {
 109                         char ndata[MAXBUF];
 110                         char* data = ndata;
 111                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 112                         char* lines = data;
 113                         char* secs = NULL;
 114                         bool ban = false;
 115                         if (*data == '*')
 116                         {
 117                                 ban = true;
 118                                 lines++;
 119                         }
 120                         else
 121                         {
 122                                 ban = false;
 123                         }
 124                         while (*data)
 125                         {
 126                                 if (*data == ':')
 127                                 {
 128                                         *data = 0;
 129                                         data++;
 130                                         secs = data;
 131                                         break;
 132                                 }
 133                                 else data++;
 134                         }
 135                         if (secs)
 136                         {
 137                                 /* Set up the flood parameters for this channel */
 138                                 int nlines = atoi(lines);
 139                                 int nsecs = atoi(secs);
 140                                 if ((nlines<1) || (nsecs<1))
 141                                 {
 142                                         source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 143                                         parameter = "";
 144                                         return MODEACTION_DENY;
 145                                 }
 146                                 else
 147                                 {
 148                                         if (!channel->GetExt("flood", f))
 149                                         {
 150                                                 parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 151                                                 floodsettings *f = new floodsettings(ban,nsecs,nlines);
 152                                                 channel->Extend("flood",f);
 153                                                 channel->SetMode('f', true);
 154                                                 channel->SetModeParam('f', parameter.c_str(), true);
 155                                                 return MODEACTION_ALLOW;
 156                                         }
 157                                         else
 158                                         {
 159                                                 if (((nlines != f->lines) || (nsecs != f->secs)) && ((nsecs > 0) && (nlines > 0)))
 160                                                 {
 161                                                         delete f;
 162                                                         floodsettings *f = new floodsettings(ban,nsecs,nlines);
 163                                                         parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 164                                                         channel->Shrink("flood");
 165                                                         channel->Extend("flood",f);
 166                                                         channel->SetModeParam('f', parameter.c_str(), true);
 167                                                         return MODEACTION_ALLOW;
 168                                                 }
 169                                         }
 170                                 }
 171                         }
 172                         else
 173                         {
 174                                 source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 175                                 parameter = "";
 176                                 return MODEACTION_DENY;
 177                         }
 178                 }
 179                 else
 180                 {
 181                         if (channel->GetExt("flood", f))
 182                         {
 183                                 DELETE(f);
 184                                 channel->Shrink("flood");
 185                                 channel->SetMode('f', false);
 186                                 return MODEACTION_ALLOW;
 187                         }
 188                 }
 189
 190                 return MODEACTION_DENY;
 191         }
 192 };
 193
 194 class ModuleMsgFlood : public Module
 195 {
 196
 197         MsgFlood* mf;
 198
 199  public:
 200
 201         ModuleMsgFlood(InspIRCd* Me)
 202                 : Module::Module(Me)
 203         {
 204
 205                 mf = new MsgFlood(ServerInstance);
 206                 ServerInstance->AddMode(mf, 'f');
 207         }
 208
 209         void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
 210         {
 211                 if (IS_LOCAL(user))
 212                 {
 213                         floodsettings *f;
 214                         if (dest->GetExt("flood", f))
 215                         {
 216                                 f->addmessage(user);
 217                                 if (f->shouldkick(user))
 218                                 {
 219                                         /* Youre outttta here! */
 220                                         f->clear(user);
 221                                         if (f->ban)
 222                                         {
 223                                                 const char* parameters[3];
 224                                                 parameters[0] = dest->name;
 225                                                 parameters[1] = "+b";
 226                                                 parameters[2] = user->MakeWildHost();
 227                                                 ServerInstance->SendMode(parameters,3,user);
 228                                                 std::deque<std::string> n;
 229                                                 /* Propogate the ban to other servers.
 230                                                  * We dont know what protocol we may be using,
 231                                                  * so this event is picked up by our protocol
 232                                                  * module and formed into a ban command that
 233                                                  * suits the protocol in use.
 234                                                  */
 235                                                 n.push_back(dest->name);
 236                                                 n.push_back("+b");
 237                                                 n.push_back(user->MakeWildHost());
 238                                                 Event rmode((char *)&n, NULL, "send_mode");
 239                                                 rmode.Send(ServerInstance);
 240                                         }
 241                                         dest->ServerKickUser(user, "Channel flood triggered (mode +f)", true);
 242                                 }
 243                         }
 244                 }
 245         }
 246
 247         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status)
 248         {
 249                 if (target_type == TYPE_CHANNEL)
 250                 {
 251                         ProcessMessages(user,(chanrec*)dest,text);
 252                 }
 253         }
 254
 255         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status)
 256         {
 257                 if (target_type == TYPE_CHANNEL)
 258                 {
 259                         ProcessMessages(user,(chanrec*)dest,text);
 260                 }
 261         }
 262
 263         void OnChannelDelete(chanrec* chan)
 264         {
 265                 floodsettings* f;
 266                 if (chan->GetExt("flood", f))
 267                 {
 268                         DELETE(f);
 269                         chan->Shrink("flood");
 270                 }
 271         }
 272
 273         void Implements(char* List)
 274         {
 275                 List[I_OnChannelDelete] = List[I_OnUserNotice] = List[I_OnUserMessage] = 1;
 276         }
 277
 278         virtual ~ModuleMsgFlood()
 279         {
 280                 ServerInstance->Modes->DelMode(mf);
 281                 DELETE(mf);
 282         }
 283
 284         virtual Version GetVersion()
 285         {
 286                 return Version(1, 0, 0, 0, VF_COMMON | VF_VENDOR);
 287         }
 288 };
 289
 290
 291 class ModuleMsgFloodFactory : public ModuleFactory
 292 {
 293  public:
 294         ModuleMsgFloodFactory()
 295         {
 296         }
 297
 298         ~ModuleMsgFloodFactory()
 299         {
 300         }
 301
 302         virtual Module * CreateModule(InspIRCd* Me)
 303         {
 304                 return new ModuleMsgFlood(Me);
 305         }
 306
 307 };
 308
 309
 310 extern "C" void * init_module( void )
 311 {
 312         return new ModuleMsgFloodFactory;
 313 }
 314