src/modules/m_park.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 <string>
  21 #include <vector>
  22 #include "users.h"
  23 #include "channels.h"
  24 #include "helperfuncs.h"
  25 #include "modules.h"
  26
  27 /* $ModDesc: Provides support for user parking/unparking */
  28
  29 class awaymsg
  30 {
  31  public:
  32         std::string from;
  33         std::string text;
  34         time_t tm;
  35 };
  36
  37 class parkedinfo
  38 {
  39  public:
  40         std::string nick;
  41         std::string host;
  42         time_t parktime;
  43 };
  44
  45 static Server *Srv;
  46 typedef std::vector<awaymsg> awaylog;
  47 typedef std::vector<parkedinfo> parkinfo;
  48 parkinfo pinfo;
  49 long ParkMaxTime;
  50 long ConcurrentParks;
  51 long ParkMaxMsgs;
  52 parkedinfo pi;
  53
  54 class cmd_park : public command_t
  55 {
  56  public:
  57         cmd_park () : command_t("PARK", 0, 0)
  58         {
  59                 this->source = "m_park.so";
  60         }
  61
  62         void Handle (char **parameters, int pcnt, userrec *user)
  63         {
  64                 /** Parking. easy stuff.
  65                  *
  66                  * We duplicate and switch the users file descriptor, so that they can remain forever as a 'ghost'
  67                  * We then disconnect the real user leaving a controlled ghost in their place :)
  68                  */
  69                 int othersessions = 0;
  70                 /* XXX - why can't just use pinfo.size() like we do below, rather than iterating over the whole vector? -- w00t */
  71                 if (pinfo.size())
  72                         for (parkinfo::iterator j = pinfo.begin(); j != pinfo.end(); j++)
  73                                 if (j->host == std::string(user->host))
  74                                         othersessions++;
  75                 if (othersessions >= ConcurrentParks)
  76                 {
  77                         Srv->SendServ(user->fd,"927 "+std::string(user->nick)+" :You are already parked up to the maximum number of allowed times.");
  78                 }
  79                 else
  80                 {
  81                         awaylog* aw;
  82                         char msg[MAXBUF];
  83                         unsigned long key = abs(random() * 12345);
  84                         snprintf(msg,MAXBUF,"You are now parked. To unpark use /UNPARK %s %lu",user->nick,key);
  85                         Srv->UserToPseudo(user,std::string(msg));
  86                         aw = new awaylog;
  87                         user->Extend("park_awaylog",(char*)aw);
  88                         user->Extend("park_key",(char*)key);
  89                         pi.nick = user->nick;
  90                         pi.host = user->host;
  91                         pi.parktime = time(NULL);
  92                         pinfo.push_back(pi);
  93                 }
  94         }
  95
  96 };
  97
  98 class cmd_parkstats : public command_t
  99 {
 100  public:
 101         cmd_parkstats () : command_t("PARKSTATS", 'o', 0)
 102         {
 103                 this->source = "m_park.so";
 104         }
 105
 106         void Handle (char **parameters, int pcnt, userrec *user)
 107         {
 108                 char status[MAXBUF];
 109                 snprintf(status,MAXBUF,"NOTICE %s :There are a total of %lu parked clients on this server, with a maximum of %lu parked sessions allowed per user.",user->nick,(unsigned long)pinfo.size(),(unsigned long)ConcurrentParks);
 110                 Srv->SendServ(user->fd,status);
 111         }
 112 };
 113
 114 class cmd_unpark : public command_t
 115 {
 116  public:
 117         cmd_unpark () : command_t("UNPARK", 0, 2)
 118         {
 119                 this->source = "m_park.so";
 120         }
 121
 122         void Handle (char **parameters, int pcnt, userrec *user)
 123         {
 124                 /** Unparking. complicated stuff.
 125                  *
 126                  * Unparking is done in several steps:
 127                  *
 128                  * (1) Check if the user is parked
 129                  * (2) Check the key of the user against the one provided
 130                  * (3) Part the user who issued the command from all of their channels so as not to confuse clients
 131                  * (4) Remove all the users UMODEs
 132                  * (5) Duplicate and switch file descriptors on the two users, and disconnect the dead one
 133                  * (6) Force a nickchange onto the user who issued the command forcing them to change to the parked nick
 134                  * (7) Force join the user into all the channels the parked nick is currently in (send them localized join and namelist)
 135                  * (8) Send the user the umodes of their new 'persona'
 136                  * (9) Spool any awaylog messages to the user
 137                  *
 138                  * And there you have it, easy huh (NOT)...
 139                  */
 140                 userrec* unpark = Srv->FindNick(std::string(parameters[0]));
 141                 if (!unpark)
 142                 {
 143                         WriteServ(user->fd,"942 %s %s :Invalid user specified.",user->nick, parameters[0]);
 144                         return;
 145                 }
 146                 awaylog* awy = (awaylog*)unpark->GetExt("park_awaylog");
 147                 long key = (long)unpark->GetExt("park_key");
 148                 if (!awy)
 149                 {
 150                         WriteServ(user->fd,"943 %s %s :This user is not parked.",user->nick, unpark->nick);
 151                         return;
 152                 }
 153                 if (key == atoi(parameters[1]))
 154                 {
 155                         // first part the user from all chans theyre on, so things dont get messy
 156                         for (std::vector<ucrec*>::iterator i = user->chans.begin(); i != user->chans.end(); i++)
 157                         {
 158                                 if (((ucrec*)(*i))->channel != NULL)
 159                                 {
 160                                         Srv->PartUserFromChannel(user,((ucrec*)(*i))->channel->name,"Unparking");
 161                                 }
 162                         }
 163                         // remove all their old modes
 164                         WriteServ(user->fd,"MODE %s -%s",user->nick,user->FormatModes());
 165                         // now, map them to the parked user, while nobody can see :p
 166                         Srv->PseudoToUser(user,unpark,"Unparked to "+std::string(parameters[0]));
 167                         // set all their new modes
 168                         WriteServ(unpark->fd,"MODE %s +%s",unpark->nick,unpark->FormatModes());
 169                         // spool their away log to them
 170                         WriteServ(unpark->fd,"NOTICE %s :*** You are now unparked. You have successfully taken back the nickname and privilages of %s.",unpark->nick,unpark->nick);
 171                         for (awaylog::iterator i = awy->begin(); i != awy->end(); i++)
 172                         {
 173                                 char timebuf[MAXBUF];
 174                                 tm *timeinfo = localtime(&i->tm);
 175                                 strlcpy(timebuf,asctime(timeinfo),MAXBUF);
 176                                 timebuf[strlen(timebuf)-1] = '\0';
 177                                 WriteServ(unpark->fd,"NOTICE %s :From %s at %s: \2%s\2",unpark->nick,i->from.c_str(),timebuf,i->text.c_str());
 178                         }
 179                         DELETE(awy);
 180                         unpark->Shrink("park_awaylog");
 181                         unpark->Shrink("park_key");
 182                         for (parkinfo::iterator j = pinfo.begin(); j != pinfo.end(); j++)
 183                         {
 184                                 if (j->nick == std::string(unpark->nick))
 185                                 {
 186                                         pinfo.erase(j);
 187                                         break;
 188                                 }
 189                         }
 190                 }
 191                 else
 192                 {
 193                         Srv->SendServ(user->fd,"928 "+std::string(user->nick)+" :Incorrect park key.");
 194                 }
 195         }
 196 };
 197
 198 class ModulePark : public Module
 199 {
 200  protected:
 201         ConfigReader* Conf;
 202         cmd_park*       cmd1;
 203         cmd_unpark*     cmd2;
 204         cmd_parkstats*  cmd3;
 205  public:
 206         virtual void ReadSettings()
 207         {
 208                 Conf = new ConfigReader;
 209                 ParkMaxTime = Conf->ReadInteger("park","maxtime",0,true);
 210                 ConcurrentParks = Conf->ReadInteger("park","maxperip",0,true);
 211                 ParkMaxMsgs = Conf->ReadInteger("park","maxmessages",0,true);
 212                 DELETE(Conf);
 213         }
 214
 215         ModulePark(Server* Me)
 216                 : Module::Module(Me)
 217         {
 218                 Srv = Me;
 219                 pinfo.clear();
 220                 this->ReadSettings();
 221                 cmd1 = new cmd_park();
 222                 cmd2 = new cmd_unpark();
 223                 cmd3 = new cmd_parkstats();
 224                 Srv->AddCommand(cmd1);
 225                 Srv->AddCommand(cmd2);
 226                 Srv->AddCommand(cmd3);
 227         }
 228
 229         virtual ~ModulePark()
 230         {
 231         }
 232
 233         void Implements(char* List)
 234         {
 235                 List[I_On005Numeric] = List[I_OnRehash] = List[I_OnUserQuit] = List[I_OnUserPreMessage] = List[I_OnUserPreNick] = List[I_OnBackgroundTimer] = List[I_OnWhois] = 1;
 236         }
 237
 238         virtual void OnRehash(const std::string &parameter)
 239         {
 240                 this->ReadSettings();
 241         }
 242
 243         virtual void On005Numeric(std::string &output)
 244         {
 245                 output = output + std::string(" PARK");
 246         }
 247
 248         virtual void OnUserQuit(userrec* user, const std::string &reason)
 249         {
 250                 std::string nick = user->nick;
 251                 // track quits in our parked user list
 252                 for (parkinfo::iterator j = pinfo.begin(); j != pinfo.end(); j++)
 253                 {
 254                         if (j->nick == nick)
 255                         {
 256                                 pinfo.erase(j);
 257                                 break;
 258                         }
 259                 }
 260         }
 261
 262
 263         virtual void OnPrePrivmsg(userrec* user, userrec* dest, const std::string &text)
 264         {
 265                 awaylog* awy = (awaylog*)dest->GetExt("park_awaylog");
 266                 if (awy)
 267                 {
 268                         if (awy->size() <= (unsigned)ParkMaxMsgs)
 269                         {
 270                                 awaymsg am;
 271                                 am.text = text;
 272                                 am.from = user->GetFullHost();
 273                                 am.tm = time(NULL);
 274                                 awy->push_back(am);
 275                                 Srv->SendServ(user->fd,"930 "+std::string(user->nick)+" :User "+std::string(dest->nick)+" is parked. Your message has been stored.");
 276                         }
 277                         else Srv->SendServ(user->fd,"929 "+std::string(user->nick)+" :User "+std::string(dest->nick)+" is parked, but their message queue is full. Message not saved.");
 278                 }
 279         }
 280
 281         virtual int OnUserPreNick(userrec* user, const std::string &newnick)
 282         {
 283                 // track nickchanges in our parked user list
 284                 // (this isnt too efficient, i'll tidy it up some time)
 285                 /* XXX - perhaps extend the user record, or, that wouldn't work - perhaps use a map? -- w00t */
 286                 for (parkinfo::iterator j = pinfo.begin(); j != pinfo.end(); j++)
 287                 {
 288                         if (j->nick == std::string(user->nick))
 289                         {
 290                                 j->nick = newnick;
 291                                 break;
 292                         }
 293                 }
 294                 return 0;
 295         }
 296
 297         virtual void OnBackgroundTimer(time_t curtime)
 298         {
 299                 // look for parked clients which have timed out (this needs tidying)
 300                 if (pinfo.empty())
 301                         return;
 302                 bool go_again = true;
 303                 while (go_again)
 304                 {
 305                         go_again = false;
 306                         for (parkinfo::iterator j = pinfo.begin(); j != pinfo.end(); j++)
 307                         {
 308                                 if (time(NULL) >= (j->parktime+ParkMaxTime))
 309                                 {
 310                                         userrec* thisnick = Srv->FindNick(j->nick);
 311                                         // THIS MUST COME BEFORE THE QuitUser - QuitUser can
 312                                         // create a recursive call to OnUserQuit in this module
 313                                         // and then corrupt the pointer!
 314                                         pinfo.erase(j);
 315                                         if (thisnick)
 316                                                 Srv->QuitUser(thisnick,"PARK timeout");
 317                                         go_again = true;
 318                                         break;
 319                                 }
 320                         }
 321                 }
 322         }
 323
 324         /* XXX - why is OnPrePrivmsg seperated here, I assume there is reason for the extra function call? --w00t */
 325         virtual int OnUserPreMessage(userrec* user,void* dest,int target_type, std::string &text, char status)
 326         {
 327                 if (target_type == TYPE_USER)
 328                 {
 329                         userrec* u = (userrec*)dest;
 330                         OnPrePrivmsg(user,u,text);
 331                 }
 332                 return 0;
 333         }
 334
 335         virtual void OnWhois(userrec* src, userrec* dst)
 336         {
 337                 if (dst->GetExt("park_awaylog"))
 338                         Srv->SendTo(NULL,src,"335 "+std::string(src->nick)+" "+std::string(dst->nick)+" :is a parked client");
 339         }
 340
 341         virtual Version GetVersion()
 342         {
 343                 return Version(1,0,0,1,VF_VENDOR);
 344         }
 345
 346 };
 347
 348 // stuff down here is the module-factory stuff. For basic modules you can ignore this.
 349
 350 class ModuleParkFactory : public ModuleFactory
 351 {
 352  public:
 353         ModuleParkFactory()
 354         {
 355         }
 356
 357         ~ModuleParkFactory()
 358         {
 359         }
 360
 361         virtual Module * CreateModule(Server* Me)
 362         {
 363                 return new ModulePark(Me);
 364         }
 365
 366 };
 367
 368
 369 extern "C" void * init_module( void )
 370 {
 371         return new ModuleParkFactory;
 372 }
 373