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