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 extern InspIRCd* ServerInstance;
  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                 log(DEBUG,"Create new floodsettings: %lu %lu",time(NULL),reset);
  45         };
  46
  47         void addmessage(userrec* who)
  48         {
  49                 std::map<userrec*,int>::iterator iter = counters.find(who);
  50                 if (iter != counters.end())
  51                 {
  52                         iter->second++;
  53                         log(DEBUG,"Count for %s is now %d",who->nick,iter->second);
  54                 }
  55                 else
  56                 {
  57                         counters[who] = 1;
  58                         log(DEBUG,"Count for %s is now *1*",who->nick);
  59                 }
  60                 if (time(NULL) > reset)
  61                 {
  62                         log(DEBUG,"floodsettings timer Resetting.");
  63                         counters.clear();
  64                         reset = time(NULL) + secs;
  65                 }
  66         }
  67
  68         bool shouldkick(userrec* who)
  69         {
  70                 std::map<userrec*,int>::iterator iter = counters.find(who);
  71                 if (iter != counters.end())
  72                 {
  73                         log(DEBUG,"should kick? %d, %d",iter->second,this->lines);
  74                         return (iter->second >= this->lines);
  75                 }
  76                 else return false;
  77         }
  78
  79         void clear(userrec* who)
  80         {
  81                 std::map<userrec*,int>::iterator iter = counters.find(who);
  82                 if (iter != counters.end())
  83                 {
  84                         counters.erase(iter);
  85                 }
  86         }
  87 };
  88
  89 class MsgFlood : public ModeHandler
  90 {
  91  public:
  92         MsgFlood(InspIRCd* Instance) : ModeHandler(Instance, 'f', 1, 0, false, MODETYPE_CHANNEL, false) { }
  93
  94         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
  95         {
  96                 floodsettings* x;
  97                 if (channel->GetExt("flood",x))
  98                         return std::make_pair(true, (x->ban ? "*" : "")+ConvToStr(x->lines)+":"+ConvToStr(x->secs));
  99                 else
 100                         return std::make_pair(false, parameter);
 101         }
 102
 103         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 104         {
 105                 /* When TS is equal, the alphabetically later one wins */
 106                 return (their_param < our_param);
 107         }
 108
 109         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 110         {
 111                 floodsettings *f;
 112
 113                 if (adding)
 114                 {
 115                         char ndata[MAXBUF];
 116                         char* data = ndata;
 117                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 118                         char* lines = data;
 119                         char* secs = NULL;
 120                         bool ban = false;
 121                         if (*data == '*')
 122                         {
 123                                 ban = true;
 124                                 lines++;
 125                         }
 126                         else
 127                         {
 128                                 ban = false;
 129                         }
 130                         while (*data)
 131                         {
 132                                 if (*data == ':')
 133                                 {
 134                                         *data = 0;
 135                                         data++;
 136                                         secs = data;
 137                                         break;
 138                                 }
 139                                 else data++;
 140                         }
 141                         if (secs)
 142                         {
 143                                 /* Set up the flood parameters for this channel */
 144                                 int nlines = atoi(lines);
 145                                 int nsecs = atoi(secs);
 146                                 if ((nlines<1) || (nsecs<1))
 147                                 {
 148                                         source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 149                                         parameter = "";
 150                                         return MODEACTION_DENY;
 151                                 }
 152                                 else
 153                                 {
 154                                         if (!channel->GetExt("flood", f))
 155                                         {
 156                                                 parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 157                                                 floodsettings *f = new floodsettings(ban,nsecs,nlines);
 158                                                 channel->Extend("flood",f);
 159                                                 channel->SetMode('f', true);
 160                                                 channel->SetModeParam('f', parameter.c_str(), true);
 161                                                 return MODEACTION_ALLOW;
 162                                         }
 163                                 }
 164                         }
 165                         else
 166                         {
 167                                 source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 168                                 parameter = "";
 169                                 return MODEACTION_DENY;
 170                         }
 171                 }
 172                 else
 173                 {
 174                         if (channel->GetExt("flood", f))
 175                         {
 176                                 DELETE(f);
 177                                 channel->Shrink("flood");
 178                                 channel->SetMode('f', false);
 179                                 return MODEACTION_ALLOW;
 180                         }
 181                 }
 182
 183                 return MODEACTION_DENY;
 184         }
 185 };
 186
 187 class ModuleMsgFlood : public Module
 188 {
 189
 190         MsgFlood* mf;
 191
 192  public:
 193
 194         ModuleMsgFlood(InspIRCd* Me)
 195                 : Module::Module(Me)
 196         {
 197
 198                 mf = new MsgFlood(ServerInstance);
 199                 ServerInstance->AddMode(mf, 'f');
 200         }
 201
 202         void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
 203         {
 204                 if (IS_LOCAL(user))
 205                 {
 206                         floodsettings *f;
 207                         if (dest->GetExt("flood", f))
 208                         {
 209                                 f->addmessage(user);
 210                                 if (f->shouldkick(user))
 211                                 {
 212                                         /* Youre outttta here! */
 213                                         f->clear(user);
 214                                         if (f->ban)
 215                                         {
 216                                                 const char* parameters[3];
 217                                                 parameters[0] = dest->name;
 218                                                 parameters[1] = "+b";
 219                                                 parameters[2] = user->MakeWildHost();
 220                                                 ServerInstance->SendMode(parameters,3,user);
 221                                                 std::deque<std::string> n;
 222                                                 /* Propogate the ban to other servers.
 223                                                  * We dont know what protocol we may be using,
 224                                                  * so this event is picked up by our protocol
 225                                                  * module and formed into a ban command that
 226                                                  * suits the protocol in use.
 227                                                  */
 228                                                 n.push_back(dest->name);
 229                                                 n.push_back("+b");
 230                                                 n.push_back(user->MakeWildHost());
 231                                                 Event rmode((char *)&n, NULL, "send_mode");
 232                                                 rmode.Send();
 233                                         }
 234                                         dest->ServerKickUser(user, "Channel flood triggered (mode +f)", true);
 235                                 }
 236                         }
 237                 }
 238         }
 239
 240         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status)
 241         {
 242                 if (target_type == TYPE_CHANNEL)
 243                 {
 244                         ProcessMessages(user,(chanrec*)dest,text);
 245                 }
 246         }
 247
 248         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status)
 249         {
 250                 if (target_type == TYPE_CHANNEL)
 251                 {
 252                         ProcessMessages(user,(chanrec*)dest,text);
 253                 }
 254         }
 255
 256         void OnChannelDelete(chanrec* chan)
 257         {
 258                 floodsettings* f;
 259                 if (chan->GetExt("flood", f))
 260                 {
 261                         DELETE(f);
 262                         chan->Shrink("flood");
 263                 }
 264         }
 265
 266         void Implements(char* List)
 267         {
 268                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserNotice] = List[I_OnUserMessage] = 1;
 269         }
 270
 271         virtual void On005Numeric(std::string &output)
 272         {
 273                 ServerInstance->ModeGrok->InsertMode(output, "f", 3);
 274         }
 275
 276         virtual ~ModuleMsgFlood()
 277         {
 278                 DELETE(mf);
 279         }
 280
 281         virtual Version GetVersion()
 282         {
 283                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 284         }
 285 };
 286
 287
 288 class ModuleMsgFloodFactory : public ModuleFactory
 289 {
 290  public:
 291         ModuleMsgFloodFactory()
 292         {
 293         }
 294
 295         ~ModuleMsgFloodFactory()
 296         {
 297         }
 298
 299         virtual Module * CreateModule(InspIRCd* Me)
 300         {
 301                 return new ModuleMsgFlood(Me);
 302         }
 303
 304 };
 305
 306
 307 extern "C" void * init_module( void )
 308 {
 309         return new ModuleMsgFloodFactory;
 310 }
 311