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 #include "inspircd.h"
  26
  27 /* $ModDesc: Provides channel mode +f (message flood protection) */
  28
  29
  30
  31 class floodsettings : public classbase
  32 {
  33  public:
  34         bool ban;
  35         int secs;
  36         int lines;
  37         time_t reset;
  38         std::map<userrec*,int> counters;
  39
  40         floodsettings() : ban(0), secs(0), lines(0) {};
  41         floodsettings(bool a, int b, int c) : ban(a), secs(b), lines(c)
  42         {
  43                 reset = time(NULL) + secs;
  44         };
  45
  46         void addmessage(userrec* who)
  47         {
  48                 std::map<userrec*,int>::iterator iter = counters.find(who);
  49                 if (iter != counters.end())
  50                 {
  51                         iter->second++;
  52                 }
  53                 else
  54                 {
  55                         counters[who] = 1;
  56                 }
  57                 if (time(NULL) > reset)
  58                 {
  59                         counters.clear();
  60                         reset = time(NULL) + secs;
  61                 }
  62         }
  63
  64         bool shouldkick(userrec* who)
  65         {
  66                 std::map<userrec*,int>::iterator iter = counters.find(who);
  67                 if (iter != counters.end())
  68                 {
  69                         return (iter->second >= this->lines);
  70                 }
  71                 else return false;
  72         }
  73
  74         void clear(userrec* who)
  75         {
  76                 std::map<userrec*,int>::iterator iter = counters.find(who);
  77                 if (iter != counters.end())
  78                 {
  79                         counters.erase(iter);
  80                 }
  81         }
  82 };
  83
  84 class MsgFlood : public ModeHandler
  85 {
  86  public:
  87         MsgFlood(InspIRCd* Instance) : ModeHandler(Instance, 'f', 1, 0, false, MODETYPE_CHANNEL, false) { }
  88
  89         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
  90         {
  91                 floodsettings* x;
  92                 if (channel->GetExt("flood",x))
  93                         return std::make_pair(true, (x->ban ? "*" : "")+ConvToStr(x->lines)+":"+ConvToStr(x->secs));
  94                 else
  95                         return std::make_pair(false, parameter);
  96         }
  97
  98         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
  99         {
 100                 /* When TS is equal, the alphabetically later one wins */
 101                 return (their_param < our_param);
 102         }
 103
 104         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 105         {
 106                 floodsettings *f;
 107
 108                 if (adding)
 109                 {
 110                         char ndata[MAXBUF];
 111                         char* data = ndata;
 112                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 113                         char* lines = data;
 114                         char* secs = NULL;
 115                         bool ban = false;
 116                         if (*data == '*')
 117                         {
 118                                 ban = true;
 119                                 lines++;
 120                         }
 121                         else
 122                         {
 123                                 ban = false;
 124                         }
 125                         while (*data)
 126                         {
 127                                 if (*data == ':')
 128                                 {
 129                                         *data = 0;
 130                                         data++;
 131                                         secs = data;
 132                                         break;
 133                                 }
 134                                 else data++;
 135                         }
 136                         if (secs)
 137                         {
 138                                 /* Set up the flood parameters for this channel */
 139                                 int nlines = atoi(lines);
 140                                 int nsecs = atoi(secs);
 141                                 if ((nlines<1) || (nsecs<1))
 142                                 {
 143                                         source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 144                                         parameter = "";
 145                                         return MODEACTION_DENY;
 146                                 }
 147                                 else
 148                                 {
 149                                         if (!channel->GetExt("flood", f))
 150                                         {
 151                                                 parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 152                                                 floodsettings *f = new floodsettings(ban,nsecs,nlines);
 153                                                 channel->Extend("flood",f);
 154                                                 channel->SetMode('f', true);
 155                                                 channel->SetModeParam('f', parameter.c_str(), true);
 156                                                 return MODEACTION_ALLOW;
 157                                         }
 158                                 }
 159                         }
 160                         else
 161                         {
 162                                 source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 163                                 parameter = "";
 164                                 return MODEACTION_DENY;
 165                         }
 166                 }
 167                 else
 168                 {
 169                         if (channel->GetExt("flood", f))
 170                         {
 171                                 DELETE(f);
 172                                 channel->Shrink("flood");
 173                                 channel->SetMode('f', false);
 174                                 return MODEACTION_ALLOW;
 175                         }
 176                 }
 177
 178                 return MODEACTION_DENY;
 179         }
 180 };
 181
 182 class ModuleMsgFlood : public Module
 183 {
 184
 185         MsgFlood* mf;
 186
 187  public:
 188
 189         ModuleMsgFlood(InspIRCd* Me)
 190                 : Module::Module(Me)
 191         {
 192
 193                 mf = new MsgFlood(ServerInstance);
 194                 ServerInstance->AddMode(mf, 'f');
 195         }
 196
 197         void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
 198         {
 199                 if (IS_LOCAL(user))
 200                 {
 201                         floodsettings *f;
 202                         if (dest->GetExt("flood", f))
 203                         {
 204                                 f->addmessage(user);
 205                                 if (f->shouldkick(user))
 206                                 {
 207                                         /* Youre outttta here! */
 208                                         f->clear(user);
 209                                         if (f->ban)
 210                                         {
 211                                                 const char* parameters[3];
 212                                                 parameters[0] = dest->name;
 213                                                 parameters[1] = "+b";
 214                                                 parameters[2] = user->MakeWildHost();
 215                                                 ServerInstance->SendMode(parameters,3,user);
 216                                                 std::deque<std::string> n;
 217                                                 /* Propogate the ban to other servers.
 218                                                  * We dont know what protocol we may be using,
 219                                                  * so this event is picked up by our protocol
 220                                                  * module and formed into a ban command that
 221                                                  * suits the protocol in use.
 222                                                  */
 223                                                 n.push_back(dest->name);
 224                                                 n.push_back("+b");
 225                                                 n.push_back(user->MakeWildHost());
 226                                                 Event rmode((char *)&n, NULL, "send_mode");
 227                                                 rmode.Send(ServerInstance);
 228                                         }
 229                                         dest->ServerKickUser(user, "Channel flood triggered (mode +f)", true);
 230                                 }
 231                         }
 232                 }
 233         }
 234
 235         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status)
 236         {
 237                 if (target_type == TYPE_CHANNEL)
 238                 {
 239                         ProcessMessages(user,(chanrec*)dest,text);
 240                 }
 241         }
 242
 243         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status)
 244         {
 245                 if (target_type == TYPE_CHANNEL)
 246                 {
 247                         ProcessMessages(user,(chanrec*)dest,text);
 248                 }
 249         }
 250
 251         void OnChannelDelete(chanrec* chan)
 252         {
 253                 floodsettings* f;
 254                 if (chan->GetExt("flood", f))
 255                 {
 256                         DELETE(f);
 257                         chan->Shrink("flood");
 258                 }
 259         }
 260
 261         void Implements(char* List)
 262         {
 263                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserNotice] = List[I_OnUserMessage] = 1;
 264         }
 265
 266         virtual void On005Numeric(std::string &output)
 267         {
 268                 ServerInstance->ModeGrok->InsertMode(output, "f", 3);
 269         }
 270
 271         virtual ~ModuleMsgFlood()
 272         {
 273                 DELETE(mf);
 274         }
 275
 276         virtual Version GetVersion()
 277         {
 278                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 279         }
 280 };
 281
 282
 283 class ModuleMsgFloodFactory : public ModuleFactory
 284 {
 285  public:
 286         ModuleMsgFloodFactory()
 287         {
 288         }
 289
 290         ~ModuleMsgFloodFactory()
 291         {
 292         }
 293
 294         virtual Module * CreateModule(InspIRCd* Me)
 295         {
 296                 return new ModuleMsgFlood(Me);
 297         }
 298
 299 };
 300
 301
 302 extern "C" void * init_module( void )
 303 {
 304         return new ModuleMsgFloodFactory;
 305 }
 306