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 /** Holds flood settings and state for mode +f
  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 /** Handles channel mode +f
  84  */
  85 class MsgFlood : public ModeHandler
  86 {
  87  public:
  88         MsgFlood(InspIRCd* Instance) : ModeHandler(Instance, 'f', 1, 0, false, MODETYPE_CHANNEL, false) { }
  89
  90         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
  91         {
  92                 floodsettings* x;
  93                 if (channel->GetExt("flood",x))
  94                         return std::make_pair(true, (x->ban ? "*" : "")+ConvToStr(x->lines)+":"+ConvToStr(x->secs));
  95                 else
  96                         return std::make_pair(false, parameter);
  97         }
  98
  99         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 100         {
 101                 /* When TS is equal, the alphabetically later one wins */
 102                 return (their_param < our_param);
 103         }
 104
 105         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 106         {
 107                 floodsettings *f;
 108
 109                 if (adding)
 110                 {
 111                         char ndata[MAXBUF];
 112                         char* data = ndata;
 113                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 114                         char* lines = data;
 115                         char* secs = NULL;
 116                         bool ban = false;
 117                         if (*data == '*')
 118                         {
 119                                 ban = true;
 120                                 lines++;
 121                         }
 122                         else
 123                         {
 124                                 ban = false;
 125                         }
 126                         while (*data)
 127                         {
 128                                 if (*data == ':')
 129                                 {
 130                                         *data = 0;
 131                                         data++;
 132                                         secs = data;
 133                                         break;
 134                                 }
 135                                 else data++;
 136                         }
 137                         if (secs)
 138                         {
 139                                 /* Set up the flood parameters for this channel */
 140                                 int nlines = atoi(lines);
 141                                 int nsecs = atoi(secs);
 142                                 if ((nlines<1) || (nsecs<1))
 143                                 {
 144                                         source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 145                                         parameter = "";
 146                                         return MODEACTION_DENY;
 147                                 }
 148                                 else
 149                                 {
 150                                         if (!channel->GetExt("flood", f))
 151                                         {
 152                                                 parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 153                                                 floodsettings *f = new floodsettings(ban,nsecs,nlines);
 154                                                 channel->Extend("flood",f);
 155                                                 channel->SetMode('f', true);
 156                                                 channel->SetModeParam('f', parameter.c_str(), true);
 157                                                 return MODEACTION_ALLOW;
 158                                         }
 159                                         else
 160                                         {
 161                                                 if (((nlines != f->lines) || (nsecs != f->secs)) && ((nsecs > 0) && (nlines > 0)))
 162                                                 {
 163                                                         delete f;
 164                                                         floodsettings *f = new floodsettings(ban,nsecs,nlines);
 165                                                         parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 166                                                         channel->Shrink("flood");
 167                                                         channel->Extend("flood",f);
 168                                                         channel->SetModeParam('f', parameter.c_str(), true);
 169                                                         return MODEACTION_ALLOW;
 170                                                 }
 171                                         }
 172                                 }
 173                         }
 174                         else
 175                         {
 176                                 source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 177                                 parameter = "";
 178                                 return MODEACTION_DENY;
 179                         }
 180                 }
 181                 else
 182                 {
 183                         if (channel->GetExt("flood", f))
 184                         {
 185                                 DELETE(f);
 186                                 channel->Shrink("flood");
 187                                 channel->SetMode('f', false);
 188                                 return MODEACTION_ALLOW;
 189                         }
 190                 }
 191
 192                 return MODEACTION_DENY;
 193         }
 194 };
 195
 196 class ModuleMsgFlood : public Module
 197 {
 198
 199         MsgFlood* mf;
 200
 201  public:
 202
 203         ModuleMsgFlood(InspIRCd* Me)
 204                 : Module::Module(Me)
 205         {
 206
 207                 mf = new MsgFlood(ServerInstance);
 208                 ServerInstance->AddMode(mf, 'f');
 209         }
 210
 211         void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
 212         {
 213                 if (IS_LOCAL(user))
 214                 {
 215                         floodsettings *f;
 216                         if (dest->GetExt("flood", f))
 217                         {
 218                                 f->addmessage(user);
 219                                 if (f->shouldkick(user))
 220                                 {
 221                                         /* Youre outttta here! */
 222                                         f->clear(user);
 223                                         if (f->ban)
 224                                         {
 225                                                 const char* parameters[3];
 226                                                 parameters[0] = dest->name;
 227                                                 parameters[1] = "+b";
 228                                                 parameters[2] = user->MakeWildHost();
 229                                                 ServerInstance->SendMode(parameters,3,user);
 230                                                 std::deque<std::string> n;
 231                                                 /* Propogate the ban to other servers.
 232                                                  * We dont know what protocol we may be using,
 233                                                  * so this event is picked up by our protocol
 234                                                  * module and formed into a ban command that
 235                                                  * suits the protocol in use.
 236                                                  */
 237                                                 n.push_back(dest->name);
 238                                                 n.push_back("+b");
 239                                                 n.push_back(user->MakeWildHost());
 240                                                 Event rmode((char *)&n, NULL, "send_mode");
 241                                                 rmode.Send(ServerInstance);
 242                                         }
 243                                         dest->ServerKickUser(user, "Channel flood triggered (mode +f)", true);
 244                                 }
 245                         }
 246                 }
 247         }
 248
 249         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status, const CUList &exempt_list)
 250         {
 251                 if (target_type == TYPE_CHANNEL)
 252                 {
 253                         ProcessMessages(user,(chanrec*)dest,text);
 254                 }
 255         }
 256
 257         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status, const CUList &exempt_list)
 258         {
 259                 if (target_type == TYPE_CHANNEL)
 260                 {
 261                         ProcessMessages(user,(chanrec*)dest,text);
 262                 }
 263         }
 264
 265         void OnChannelDelete(chanrec* chan)
 266         {
 267                 floodsettings* f;
 268                 if (chan->GetExt("flood", f))
 269                 {
 270                         DELETE(f);
 271                         chan->Shrink("flood");
 272                 }
 273         }
 274
 275         void Implements(char* List)
 276         {
 277                 List[I_OnChannelDelete] = List[I_OnUserNotice] = List[I_OnUserMessage] = 1;
 278         }
 279
 280         virtual ~ModuleMsgFlood()
 281         {
 282                 ServerInstance->Modes->DelMode(mf);
 283                 DELETE(mf);
 284         }
 285
 286         virtual Version GetVersion()
 287         {
 288                 return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
 289         }
 290 };
 291
 292
 293 class ModuleMsgFloodFactory : public ModuleFactory
 294 {
 295  public:
 296         ModuleMsgFloodFactory()
 297         {
 298         }
 299
 300         ~ModuleMsgFloodFactory()
 301         {
 302         }
 303
 304         virtual Module * CreateModule(InspIRCd* Me)
 305         {
 306                 return new ModuleMsgFlood(Me);
 307         }
 308
 309 };
 310
 311
 312 extern "C" void * init_module( void )
 313 {
 314         return new ModuleMsgFloodFactory;
 315 }
 316