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 class floodsettings : public classbase
  30 {
  31  public:
  32         bool ban;
  33         int secs;
  34         int lines;
  35         time_t reset;
  36         std::map<userrec*,int> counters;
  37
  38         floodsettings() : ban(0), secs(0), lines(0) {};
  39         floodsettings(bool a, int b, int c) : ban(a), secs(b), lines(c)
  40         {
  41                 reset = time(NULL) + secs;
  42                 log(DEBUG,"Create new floodsettings: %lu %lu",time(NULL),reset);
  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                         log(DEBUG,"Count for %s is now %d",who->nick,iter->second);
  52                 }
  53                 else
  54                 {
  55                         counters[who] = 1;
  56                         log(DEBUG,"Count for %s is now *1*",who->nick);
  57                 }
  58                 if (time(NULL) > reset)
  59                 {
  60                         log(DEBUG,"floodsettings timer Resetting.");
  61                         counters.clear();
  62                         reset = time(NULL) + secs;
  63                 }
  64         }
  65
  66         bool shouldkick(userrec* who)
  67         {
  68                 std::map<userrec*,int>::iterator iter = counters.find(who);
  69                 if (iter != counters.end())
  70                 {
  71                         log(DEBUG,"should kick? %d, %d",iter->second,this->lines);
  72                         return (iter->second >= this->lines);
  73                 }
  74                 else return false;
  75         }
  76
  77         void clear(userrec* who)
  78         {
  79                 std::map<userrec*,int>::iterator iter = counters.find(who);
  80                 if (iter != counters.end())
  81                 {
  82                         counters.erase(iter);
  83                 }
  84         }
  85 };
  86
  87 class MsgFlood : public ModeHandler
  88 {
  89  public:
  90         MsgFlood() : ModeHandler('f', 1, 0, false, MODETYPE_CHANNEL, false) { }
  91
  92         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
  93         {
  94                 floodsettings* x;
  95                 if (channel->GetExt("flood",x))
  96                         return std::make_pair(true, (x->ban ? "*" : "")+ConvToStr(x->lines)+":"+ConvToStr(x->secs));
  97                 else
  98                         return std::make_pair(false, parameter);
  99         }
 100
 101         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 102         {
 103                 /* When TS is equal, the alphabetically later one wins */
 104                 return (their_param < our_param);
 105         }
 106
 107         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 108         {
 109                 floodsettings *f;
 110
 111                 if (adding)
 112                 {
 113                         char ndata[MAXBUF];
 114                         char* data = ndata;
 115                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 116                         char* lines = data;
 117                         char* secs = NULL;
 118                         bool ban = false;
 119                         if (*data == '*')
 120                         {
 121                                 ban = true;
 122                                 lines++;
 123                         }
 124                         else
 125                         {
 126                                 ban = false;
 127                         }
 128                         while (*data)
 129                         {
 130                                 if (*data == ':')
 131                                 {
 132                                         *data = 0;
 133                                         data++;
 134                                         secs = data;
 135                                         break;
 136                                 }
 137                                 else data++;
 138                         }
 139                         if (secs)
 140                         {
 141                                 /* Set up the flood parameters for this channel */
 142                                 int nlines = atoi(lines);
 143                                 int nsecs = atoi(secs);
 144                                 if ((nlines<1) || (nsecs<1))
 145                                 {
 146                                         source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 147                                         parameter = "";
 148                                         return MODEACTION_DENY;
 149                                 }
 150                                 else
 151                                 {
 152                                         if (!channel->GetExt("flood", f))
 153                                         {
 154                                                 parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 155                                                 floodsettings *f = new floodsettings(ban,nsecs,nlines);
 156                                                 channel->Extend("flood",f);
 157                                                 channel->SetMode('f', true);
 158                                                 channel->SetModeParam('f', parameter.c_str(), true);
 159                                                 return MODEACTION_ALLOW;
 160                                         }
 161                                 }
 162                         }
 163                         else
 164                         {
 165                                 source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 166                                 parameter = "";
 167                                 return MODEACTION_DENY;
 168                         }
 169                 }
 170                 else
 171                 {
 172                         if (channel->GetExt("flood", f))
 173                         {
 174                                 DELETE(f);
 175                                 channel->Shrink("flood");
 176                                 channel->SetMode('f', false);
 177                                 return MODEACTION_ALLOW;
 178                         }
 179                 }
 180
 181                 return MODEACTION_DENY;
 182         }
 183 };
 184
 185 class ModuleMsgFlood : public Module
 186 {
 187         Server *Srv;
 188         MsgFlood* mf;
 189
 190  public:
 191
 192         ModuleMsgFlood(Server* Me)
 193                 : Module::Module(Me)
 194         {
 195                 Srv = Me;
 196                 mf = new MsgFlood();
 197                 Srv->AddMode(mf, 'f');
 198         }
 199
 200         void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
 201         {
 202                 if (IS_LOCAL(user))
 203                 {
 204                         floodsettings *f;
 205                         if (dest->GetExt("flood", f))
 206                         {
 207                                 f->addmessage(user);
 208                                 if (f->shouldkick(user))
 209                                 {
 210                                         /* Youre outttta here! */
 211                                         f->clear(user);
 212                                         if (f->ban)
 213                                         {
 214                                                 const char* parameters[3];
 215                                                 parameters[0] = dest->name;
 216                                                 parameters[1] = "+b";
 217                                                 parameters[2] = user->MakeWildHost();
 218                                                 Srv->SendMode(parameters,3,user);
 219                                                 std::deque<std::string> n;
 220                                                 /* Propogate the ban to other servers.
 221                                                  * We dont know what protocol we may be using,
 222                                                  * so this event is picked up by our protocol
 223                                                  * module and formed into a ban command that
 224                                                  * suits the protocol in use.
 225                                                  */
 226                                                 n.push_back(dest->name);
 227                                                 n.push_back("+b");
 228                                                 n.push_back(user->MakeWildHost());
 229                                                 Event rmode((char *)&n, NULL, "send_mode");
 230                                                 rmode.Send();
 231                                         }
 232                                         dest->ServerKickUser(user, "Channel flood triggered (mode +f)", true);
 233                                 }
 234                         }
 235                 }
 236         }
 237
 238         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status)
 239         {
 240                 if (target_type == TYPE_CHANNEL)
 241                 {
 242                         ProcessMessages(user,(chanrec*)dest,text);
 243                 }
 244         }
 245
 246         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status)
 247         {
 248                 if (target_type == TYPE_CHANNEL)
 249                 {
 250                         ProcessMessages(user,(chanrec*)dest,text);
 251                 }
 252         }
 253
 254         void OnChannelDelete(chanrec* chan)
 255         {
 256                 floodsettings* f;
 257                 if (chan->GetExt("flood", f))
 258                 {
 259                         DELETE(f);
 260                         chan->Shrink("flood");
 261                 }
 262         }
 263
 264         void Implements(char* List)
 265         {
 266                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserNotice] = List[I_OnUserMessage] = 1;
 267         }
 268
 269         virtual void On005Numeric(std::string &output)
 270         {
 271                 InsertMode(output, "f", 3);
 272         }
 273
 274         virtual ~ModuleMsgFlood()
 275         {
 276                 DELETE(mf);
 277         }
 278
 279         virtual Version GetVersion()
 280         {
 281                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 282         }
 283 };
 284
 285
 286 class ModuleMsgFloodFactory : public ModuleFactory
 287 {
 288  public:
 289         ModuleMsgFloodFactory()
 290         {
 291         }
 292
 293         ~ModuleMsgFloodFactory()
 294         {
 295         }
 296
 297         virtual Module * CreateModule(Server* Me)
 298         {
 299                 return new ModuleMsgFlood(Me);
 300         }
 301
 302 };
 303
 304
 305 extern "C" void * init_module( void )
 306 {
 307         return new ModuleMsgFloodFactory;
 308 }
 309