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         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
  92         {
  93                 floodsettings *f;
  94
  95                 if (adding)
  96                 {
  97                         char ndata[MAXBUF];
  98                         char* data = ndata;
  99                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 100                         char* lines = data;
 101                         char* secs = NULL;
 102                         bool ban = false;
 103                         if (*data == '*')
 104                         {
 105                                 ban = true;
 106                                 lines++;
 107                         }
 108                         else
 109                         {
 110                                 ban = false;
 111                         }
 112                         while (*data)
 113                         {
 114                                 if (*data == ':')
 115                                 {
 116                                         *data = 0;
 117                                         data++;
 118                                         secs = data;
 119                                         break;
 120                                 }
 121                                 else data++;
 122                         }
 123                         if (secs)
 124                         {
 125                                 /* Set up the flood parameters for this channel */
 126                                 int nlines = atoi(lines);
 127                                 int nsecs = atoi(secs);
 128                                 if ((nlines<1) || (nsecs<1))
 129                                 {
 130                                         WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 131                                         parameter = "";
 132                                         return MODEACTION_DENY;
 133                                 }
 134                                 else
 135                                 {
 136                                         if (!channel->GetExt("flood", f))
 137                                         {
 138                                                 parameter = ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 139                                                 floodsettings *f = new floodsettings(ban,nsecs,nlines);
 140                                                 channel->Extend("flood",f);
 141                                                 channel->SetMode('f', true);
 142                                                 channel->SetModeParam('f', parameter.c_str(), true);
 143                                                 return MODEACTION_ALLOW;
 144                                         }
 145                                 }
 146                         }
 147                         else
 148                         {
 149                                 WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 150                                 parameter = "";
 151                                 return MODEACTION_DENY;
 152                         }
 153                 }
 154                 else
 155                 {
 156                         if (channel->GetExt("flood", f))
 157                         {
 158                                 DELETE(f);
 159                                 channel->Shrink("flood");
 160                                 channel->SetMode('f', false);
 161                                 return MODEACTION_ALLOW;
 162                         }
 163                 }
 164
 165                 return MODEACTION_DENY;
 166         }
 167 };
 168
 169 class ModuleMsgFlood : public Module
 170 {
 171         Server *Srv;
 172         MsgFlood* mf;
 173
 174  public:
 175
 176         ModuleMsgFlood(Server* Me)
 177                 : Module::Module(Me)
 178         {
 179                 Srv = Me;
 180                 mf = new MsgFlood();
 181                 Srv->AddMode(mf, 'f');
 182         }
 183
 184         void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
 185         {
 186                 if (IS_LOCAL(user))
 187                 {
 188                         floodsettings *f;
 189                         if (dest->GetExt("flood", f))
 190                         {
 191                                 f->addmessage(user);
 192                                 if (f->shouldkick(user))
 193                                 {
 194                                         /* Youre outttta here! */
 195                                         f->clear(user);
 196                                         if (f->ban)
 197                                         {
 198                                                 const char* parameters[3];
 199                                                 parameters[0] = dest->name;
 200                                                 parameters[1] = "+b";
 201                                                 parameters[2] = user->MakeWildHost();
 202                                                 Srv->SendMode(parameters,3,user);
 203                                                 std::deque<std::string> n;
 204                                                 /* Propogate the ban to other servers.
 205                                                  * We dont know what protocol we may be using,
 206                                                  * so this event is picked up by our protocol
 207                                                  * module and formed into a ban command that
 208                                                  * suits the protocol in use.
 209                                                  */
 210                                                 n.push_back(dest->name);
 211                                                 n.push_back("+b");
 212                                                 n.push_back(user->MakeWildHost());
 213                                                 Event rmode((char *)&n, NULL, "send_mode");
 214                                                 rmode.Send();
 215                                         }
 216                                         Srv->KickUser(NULL, user, dest, "Channel flood triggered (mode +f)");
 217                                 }
 218                         }
 219                 }
 220         }
 221
 222         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status)
 223         {
 224                 if (target_type == TYPE_CHANNEL)
 225                 {
 226                         ProcessMessages(user,(chanrec*)dest,text);
 227                 }
 228         }
 229
 230         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status)
 231         {
 232                 if (target_type == TYPE_CHANNEL)
 233                 {
 234                         ProcessMessages(user,(chanrec*)dest,text);
 235                 }
 236         }
 237
 238         void OnChannelDelete(chanrec* chan)
 239         {
 240                 floodsettings* f;
 241                 if (chan->GetExt("flood", f))
 242                 {
 243                         DELETE(f);
 244                         chan->Shrink("flood");
 245                 }
 246         }
 247
 248         void Implements(char* List)
 249         {
 250                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserNotice] = List[I_OnUserMessage] = 1;
 251         }
 252
 253         virtual void On005Numeric(std::string &output)
 254         {
 255                 InsertMode(output, "f", 3);
 256         }
 257
 258         virtual ~ModuleMsgFlood()
 259         {
 260                 DELETE(mf);
 261         }
 262
 263         virtual Version GetVersion()
 264         {
 265                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 266         }
 267 };
 268
 269
 270 class ModuleMsgFloodFactory : public ModuleFactory
 271 {
 272  public:
 273         ModuleMsgFloodFactory()
 274         {
 275         }
 276
 277         ~ModuleMsgFloodFactory()
 278         {
 279         }
 280
 281         virtual Module * CreateModule(Server* Me)
 282         {
 283                 return new ModuleMsgFlood(Me);
 284         }
 285
 286 };
 287
 288
 289 extern "C" void * init_module( void )
 290 {
 291         return new ModuleMsgFloodFactory;
 292 }
 293