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
  26 /* $ModDesc: Provides channel mode +f (message flood protection) */
  27
  28 class floodsettings : public classbase
  29 {
  30  public:
  31         bool ban;
  32         int secs;
  33         int lines;
  34         time_t reset;
  35         std::map<userrec*,int> counters;
  36
  37         floodsettings() : ban(0), secs(0), lines(0) {};
  38         floodsettings(bool a, int b, int c) : ban(a), secs(b), lines(c)
  39         {
  40                 reset = time(NULL) + secs;
  41                 log(DEBUG,"Create new floodsettings: %lu %lu",time(NULL),reset);
  42         };
  43
  44         void addmessage(userrec* who)
  45         {
  46                 std::map<userrec*,int>::iterator iter = counters.find(who);
  47                 if (iter != counters.end())
  48                 {
  49                         iter->second++;
  50                         log(DEBUG,"Count for %s is now %d",who->nick,iter->second);
  51                 }
  52                 else
  53                 {
  54                         counters[who] = 1;
  55                         log(DEBUG,"Count for %s is now *1*",who->nick);
  56                 }
  57                 if (time(NULL) > reset)
  58                 {
  59                         log(DEBUG,"floodsettings timer Resetting.");
  60                         counters.clear();
  61                         reset = time(NULL) + secs;
  62                 }
  63         }
  64
  65         bool shouldkick(userrec* who)
  66         {
  67                 std::map<userrec*,int>::iterator iter = counters.find(who);
  68                 if (iter != counters.end())
  69                 {
  70                         log(DEBUG,"should kick? %d, %d",iter->second,this->lines);
  71                         return (iter->second >= this->lines);
  72                 }
  73                 else return false;
  74         }
  75
  76         void clear(userrec* who)
  77         {
  78                 std::map<userrec*,int>::iterator iter = counters.find(who);
  79                 if (iter != counters.end())
  80                 {
  81                         counters.erase(iter);
  82                 }
  83         }
  84 };
  85
  86 class MsgFlood : public ModeHandler
  87 {
  88  public:
  89         MsgFlood() : ModeHandler('f', 1, 0, false, MODETYPE_CHANNEL, false) { }
  90
  91         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
  92         {
  93                 floodsettings* x;
  94                 if (channel->GetExt("flood",x))
  95                         return std::make_pair(true, (x->ban ? "*" : "")+ConvToStr(x->lines)+":"+ConvToStr(x->secs));
  96                 else
  97                         return std::make_pair(false, parameter);
  98         }
  99
 100         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 101         {
 102                 /* When TS is equal, the alphabetically later one wins */
 103                 return (their_param < our_param);
 104         }
 105
 106         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 107         {
 108                 floodsettings *f;
 109
 110                 if (adding)
 111                 {
 112                         char ndata[MAXBUF];
 113                         char* data = ndata;
 114                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 115                         char* lines = data;
 116                         char* secs = NULL;
 117                         bool ban = false;
 118                         if (*data == '*')
 119                         {
 120                                 ban = true;
 121                                 lines++;
 122                         }
 123                         else
 124                         {
 125                                 ban = false;
 126                         }
 127                         while (*data)
 128                         {
 129                                 if (*data == ':')
 130                                 {
 131                                         *data = 0;
 132                                         data++;
 133                                         secs = data;
 134                                         break;
 135                                 }
 136                                 else data++;
 137                         }
 138                         if (secs)
 139                         {
 140                                 /* Set up the flood parameters for this channel */
 141                                 int nlines = atoi(lines);
 142                                 int nsecs = atoi(secs);
 143                                 if ((nlines<1) || (nsecs<1))
 144                                 {
 145                                         WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 146                                         parameter = "";
 147                                         return MODEACTION_DENY;
 148                                 }
 149                                 else
 150                                 {
 151                                         if (!channel->GetExt("flood", f))
 152                                         {
 153                                                 parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 154                                                 floodsettings *f = new floodsettings(ban,nsecs,nlines);
 155                                                 channel->Extend("flood",f);
 156                                                 channel->SetMode('f', true);
 157                                                 channel->SetModeParam('f', parameter.c_str(), true);
 158                                                 return MODEACTION_ALLOW;
 159                                         }
 160                                 }
 161                         }
 162                         else
 163                         {
 164                                 WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 165                                 parameter = "";
 166                                 return MODEACTION_DENY;
 167                         }
 168                 }
 169                 else
 170                 {
 171                         if (channel->GetExt("flood", f))
 172                         {
 173                                 DELETE(f);
 174                                 channel->Shrink("flood");
 175                                 channel->SetMode('f', false);
 176                                 return MODEACTION_ALLOW;
 177                         }
 178                 }
 179
 180                 return MODEACTION_DENY;
 181         }
 182 };
 183
 184 class ModuleMsgFlood : public Module
 185 {
 186         Server *Srv;
 187         MsgFlood* mf;
 188
 189  public:
 190
 191         ModuleMsgFlood(Server* Me)
 192                 : Module::Module(Me)
 193         {
 194                 Srv = Me;
 195                 mf = new MsgFlood();
 196                 Srv->AddMode(mf, 'f');
 197         }
 198
 199         void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
 200         {
 201                 if (IS_LOCAL(user))
 202                 {
 203                         floodsettings *f;
 204                         if (dest->GetExt("flood", f))
 205                         {
 206                                 f->addmessage(user);
 207                                 if (f->shouldkick(user))
 208                                 {
 209                                         /* Youre outttta here! */
 210                                         f->clear(user);
 211                                         if (f->ban)
 212                                         {
 213                                                 const char* parameters[3];
 214                                                 parameters[0] = dest->name;
 215                                                 parameters[1] = "+b";
 216                                                 parameters[2] = user->MakeWildHost();
 217                                                 Srv->SendMode(parameters,3,user);
 218                                                 std::deque<std::string> n;
 219                                                 /* Propogate the ban to other servers.
 220                                                  * We dont know what protocol we may be using,
 221                                                  * so this event is picked up by our protocol
 222                                                  * module and formed into a ban command that
 223                                                  * suits the protocol in use.
 224                                                  */
 225                                                 n.push_back(dest->name);
 226                                                 n.push_back("+b");
 227                                                 n.push_back(user->MakeWildHost());
 228                                                 Event rmode((char *)&n, NULL, "send_mode");
 229                                                 rmode.Send();
 230                                         }
 231                                         dest->ServerKickUser(user, "Channel flood triggered (mode +f)", true);
 232                                 }
 233                         }
 234                 }
 235         }
 236
 237         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status)
 238         {
 239                 if (target_type == TYPE_CHANNEL)
 240                 {
 241                         ProcessMessages(user,(chanrec*)dest,text);
 242                 }
 243         }
 244
 245         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status)
 246         {
 247                 if (target_type == TYPE_CHANNEL)
 248                 {
 249                         ProcessMessages(user,(chanrec*)dest,text);
 250                 }
 251         }
 252
 253         void OnChannelDelete(chanrec* chan)
 254         {
 255                 floodsettings* f;
 256                 if (chan->GetExt("flood", f))
 257                 {
 258                         DELETE(f);
 259                         chan->Shrink("flood");
 260                 }
 261         }
 262
 263         void Implements(char* List)
 264         {
 265                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserNotice] = List[I_OnUserMessage] = 1;
 266         }
 267
 268         virtual void On005Numeric(std::string &output)
 269         {
 270                 InsertMode(output, "f", 3);
 271         }
 272
 273         virtual ~ModuleMsgFlood()
 274         {
 275                 DELETE(mf);
 276         }
 277
 278         virtual Version GetVersion()
 279         {
 280                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 281         }
 282 };
 283
 284
 285 class ModuleMsgFloodFactory : public ModuleFactory
 286 {
 287  public:
 288         ModuleMsgFloodFactory()
 289         {
 290         }
 291
 292         ~ModuleMsgFloodFactory()
 293         {
 294         }
 295
 296         virtual Module * CreateModule(Server* Me)
 297         {
 298                 return new ModuleMsgFlood(Me);
 299         }
 300
 301 };
 302
 303
 304 extern "C" void * init_module( void )
 305 {
 306         return new ModuleMsgFloodFactory;
 307 }
 308