src/users.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 #include "inspircd_config.h"
  18 #include "configreader.h"
  19 #include "channels.h"
  20 #include "connection.h"
  21 #include "users.h"
  22 #include "inspircd.h"
  23 #include <stdio.h>
  24 #include "inspstring.h"
  25 #include "commands.h"
  26 #include "helperfuncs.h"
  27 #include "typedefs.h"
  28 #include "socketengine.h"
  29 #include "hashcomp.h"
  30 #include "message.h"
  31 #include "wildcard.h"
  32 #include "xline.h"
  33 #include "cull_list.h"
  34
  35 extern InspIRCd* ServerInstance;
  36 extern int WHOWAS_STALE;
  37 extern int WHOWAS_MAX;
  38 extern std::vector<Module*> modules;
  39 extern std::vector<ircd_module*> factory;
  40 extern std::vector<InspSocket*> module_sockets;
  41 extern int MODCOUNT;
  42 extern InspSocket* socket_ref[MAX_DESCRIPTORS];
  43 extern time_t TIME;
  44 extern userrec* fd_ref_table[MAX_DESCRIPTORS];
  45 extern ServerConfig *Config;
  46 extern user_hash clientlist;
  47 extern Server* MyServer;
  48
  49 whowas_users whowas;
  50
  51 extern std::vector<userrec*> local_users;
  52
  53 std::vector<userrec*> all_opers;
  54
  55 typedef std::map<irc::string,char*> opertype_t;
  56 typedef opertype_t operclass_t;
  57
  58 opertype_t opertypes;
  59 operclass_t operclass;
  60
  61 bool InitTypes(const char* tag)
  62 {
  63         for (opertype_t::iterator n = opertypes.begin(); n != opertypes.end(); n++)
  64         {
  65                 if (n->second)
  66                         delete[] n->second;
  67         }
  68
  69         opertypes.clear();
  70         return true;
  71 }
  72
  73 bool InitClasses(const char* tag)
  74 {
  75         for (operclass_t::iterator n = operclass.begin(); n != operclass.end(); n++)
  76         {
  77                 if (n->second)
  78                         delete[] n->second;
  79         }
  80
  81         operclass.clear();
  82         return true;
  83 }
  84
  85 bool DoType(const char* tag, char** entries, void** values, int* types)
  86 {
  87         char* TypeName = (char*)values[0];
  88         char* Classes = (char*)values[1];
  89
  90         opertypes[TypeName] = strdup(Classes);
  91         log(DEBUG,"Read oper TYPE '%s' with classes '%s'",TypeName,Classes);
  92         return true;
  93 }
  94
  95 bool DoClass(const char* tag, char** entries, void** values, int* types)
  96 {
  97         char* ClassName = (char*)values[0];
  98         char* CommandList = (char*)values[1];
  99
 100         operclass[ClassName] = strdup(CommandList);
 101         log(DEBUG,"Read oper CLASS '%s' with commands '%s'",ClassName,CommandList);
 102         return true;
 103 }
 104
 105 bool DoneClassesAndTypes(const char* tag)
 106 {
 107         return true;
 108 }
 109
 110 bool userrec::ProcessNoticeMasks(const char *sm)
 111 {
 112         bool adding = true;
 113         const char *c = sm;
 114
 115         while (c && *c)
 116         {
 117                 switch (*c)
 118                 {
 119                         case '+':
 120                                 adding = true;
 121                                 break;
 122                         case '-':
 123                                 adding = false;
 124                                 break;
 125                         default:
 126                                 if ((*c >= 'A') && (*c <= 'z'))
 127                                         this->SetNoticeMask(*c, adding);
 128                                 break;
 129                 }
 130
 131                 *c++;
 132         }
 133
 134         return true;
 135 }
 136
 137 void userrec::StartDNSLookup()
 138 {
 139         log(DEBUG,"Commencing forward lookup");
 140         res_reverse = new UserResolver(this, insp_ntoa(this->ip4), false);
 141         MyServer->AddResolver(res_reverse);
 142 }
 143
 144 UserResolver::UserResolver(userrec* user, std::string to_resolve, bool forward) : Resolver(to_resolve, forward), bound_user(user)
 145 {
 146         this->bound_fd = user->fd;
 147 }
 148
 149 void UserResolver::OnLookupComplete(const std::string &result)
 150 {
 151         if ((!this->fwd) && (fd_ref_table[this->bound_fd] == this->bound_user))
 152         {
 153                 log(DEBUG,"Commencing reverse lookup");
 154                 this->bound_user->stored_host = result;
 155                 bound_user->res_forward = new UserResolver(this->bound_user, result, true);
 156                 MyServer->AddResolver(bound_user->res_forward);
 157         }
 158         else if ((this->fwd) && (fd_ref_table[this->bound_fd] == this->bound_user))
 159         {
 160                 /* Both lookups completed */
 161                 if (insp_ntoa(this->bound_user->ip4) == result)
 162                 {
 163                         std::string hostname = this->bound_user->stored_host;
 164                         if (hostname.length() < 65)
 165                         {
 166                                 WriteServ(this->bound_fd, "NOTICE Auth :*** Found your hostname (%s)", this->bound_user->stored_host.c_str());
 167                                 this->bound_user->dns_done = true;
 168                                 strlcpy(this->bound_user->dhost, hostname.c_str(),64);
 169                                 strlcpy(this->bound_user->host, hostname.c_str(),64);
 170                         }
 171                         else
 172                         {
 173                                 WriteServ(this->bound_fd, "NOTICE Auth :*** Your hostname is longer than the maximum of 64 characters, using your IP address (%s) instead.", insp_ntoa(this->bound_user->ip4));
 174                         }
 175                 }
 176                 else
 177                 {
 178                         WriteServ(this->bound_fd, "NOTICE Auth :*** Your hostname does not match up with your IP address. Sorry, using your IP address (%s) instead.", insp_ntoa(this->bound_user->ip4));
 179                 }
 180         }
 181 }
 182
 183 void UserResolver::OnError(ResolverError e)
 184 {
 185         if (fd_ref_table[this->bound_fd] == this->bound_user)
 186         {
 187                 /* Error message here */
 188                 WriteServ(this->bound_fd, "*** Could not resolve your hostname, using your IP address (%s) instead.", insp_ntoa(this->bound_user->ip4));
 189                 this->bound_user->dns_done = true;
 190         }
 191 }
 192
 193
 194 bool userrec::IsNoticeMaskSet(unsigned char sm)
 195 {
 196         return (snomasks[sm-65]);
 197 }
 198
 199 void userrec::SetNoticeMask(unsigned char sm, bool value)
 200 {
 201         snomasks[sm-65] = value;
 202 }
 203
 204 const char* userrec::FormatNoticeMasks()
 205 {
 206         static char data[MAXBUF];
 207         int offset = 0;
 208
 209         for (int n = 0; n < 64; n++)
 210         {
 211                 if (snomasks[n])
 212                         data[offset++] = n+65;
 213         }
 214
 215         data[offset] = 0;
 216         return data;
 217 }
 218
 219
 220
 221 bool userrec::IsModeSet(unsigned char m)
 222 {
 223         return (modes[m-65]);
 224 }
 225
 226 void userrec::SetMode(unsigned char m, bool value)
 227 {
 228         modes[m-65] = value;
 229 }
 230
 231 const char* userrec::FormatModes()
 232 {
 233         static char data[MAXBUF];
 234         int offset = 0;
 235         for (int n = 0; n < 64; n++)
 236         {
 237                 if (modes[n])
 238                         data[offset++] = n+65;
 239         }
 240         data[offset] = 0;
 241         return data;
 242 }
 243
 244 userrec::userrec()
 245 {
 246         // the PROPER way to do it, AVOID bzero at *ALL* costs
 247         *password = *nick = *ident = *host = *dhost = *fullname = *awaymsg = *oper = 0;
 248         server = (char*)FindServerNamePtr(Config->ServerName);
 249         reset_due = TIME;
 250         lines_in = fd = lastping = signon = idle_lastmsg = nping = registered = 0;
 251         timeout = flood = port = bytes_in = bytes_out = cmds_in = cmds_out = 0;
 252         haspassed = dns_done = false;
 253         recvq = "";
 254         sendq = "";
 255         res_forward = res_reverse = NULL;
 256         chans.clear();
 257         invites.clear();
 258         chans.resize(MAXCHANS);
 259         memset(modes,0,sizeof(modes));
 260
 261         for (unsigned int n = 0; n < MAXCHANS; n++)
 262         {
 263                 ucrec* x = new ucrec();
 264                 chans[n] = x;
 265                 x->channel = NULL;
 266                 x->uc_modes = 0;
 267         }
 268 }
 269
 270 userrec::~userrec()
 271 {
 272         for (std::vector<ucrec*>::iterator n = chans.begin(); n != chans.end(); n++)
 273         {
 274                 ucrec* x = (ucrec*)*n;
 275                 delete x;
 276         }
 277 }
 278
 279 /* XXX - minor point, other *Host functions return a char *, this one creates it. Might be nice to be consistant? */
 280 void userrec::MakeHost(char* nhost)
 281 {
 282         /* This is much faster than snprintf */
 283         char* t = nhost;
 284         for(char* n = ident; *n; n++)
 285                 *t++ = *n;
 286         *t++ = '@';
 287         for(char* n = host; *n; n++)
 288                 *t++ = *n;
 289         *t = 0;
 290 }
 291
 292 void userrec::CloseSocket()
 293 {
 294         shutdown(this->fd,2);
 295         close(this->fd);
 296 }
 297
 298 char* userrec::GetFullHost()
 299 {
 300         static char result[MAXBUF];
 301         char* t = result;
 302         for(char* n = nick; *n; n++)
 303                 *t++ = *n;
 304         *t++ = '!';
 305         for(char* n = ident; *n; n++)
 306                 *t++ = *n;
 307         *t++ = '@';
 308         for(char* n = dhost; *n; n++)
 309                 *t++ = *n;
 310         *t = 0;
 311         return result;
 312 }
 313
 314 char* userrec::MakeWildHost()
 315 {
 316         static char nresult[MAXBUF];
 317         char* t = nresult;
 318         *t++ = '*';     *t++ = '!';
 319         *t++ = '*';     *t++ = '@';
 320         for(char* n = dhost; *n; n++)
 321                 *t++ = *n;
 322         *t = 0;
 323         return nresult;
 324 }
 325
 326 int userrec::ReadData(void* buffer, size_t size)
 327 {
 328         if (this->fd > -1)
 329         {
 330                 return read(this->fd, buffer, size);
 331         }
 332         else
 333                 return 0;
 334 }
 335
 336
 337 char* userrec::GetFullRealHost()
 338 {
 339         static char fresult[MAXBUF];
 340         char* t = fresult;
 341         for(char* n = nick; *n; n++)
 342                 *t++ = *n;
 343         *t++ = '!';
 344         for(char* n = ident; *n; n++)
 345                 *t++ = *n;
 346         *t++ = '@';
 347         for(char* n = host; *n; n++)
 348                 *t++ = *n;
 349         *t = 0;
 350         return fresult;
 351 }
 352
 353 bool userrec::IsInvited(irc::string &channel)
 354 {
 355         for (InvitedList::iterator i = invites.begin(); i != invites.end(); i++)
 356         {
 357                 irc::string compare = i->channel;
 358
 359                 if (compare == channel)
 360                 {
 361                         return true;
 362                 }
 363         }
 364         return false;
 365 }
 366
 367 InvitedList* userrec::GetInviteList()
 368 {
 369         return &invites;
 370 }
 371
 372 void userrec::InviteTo(irc::string &channel)
 373 {
 374         Invited i;
 375         i.channel = channel;
 376         invites.push_back(i);
 377 }
 378
 379 void userrec::RemoveInvite(irc::string &channel)
 380 {
 381         log(DEBUG,"Removing invites");
 382
 383         if (invites.size())
 384         {
 385                 for (InvitedList::iterator i = invites.begin(); i != invites.end(); i++)
 386                 {
 387                         irc::string compare = i->channel;
 388
 389                         if (compare == channel)
 390                         {
 391                                 invites.erase(i);
 392                                 return;
 393                         }
 394                 }
 395         }
 396 }
 397
 398 bool userrec::HasPermission(const std::string &command)
 399 {
 400         char* mycmd;
 401         char* savept;
 402         char* savept2;
 403
 404         /*
 405          * users on remote servers can completely bypass all permissions based checks.
 406          * This prevents desyncs when one server has different type/class tags to another.
 407          * That having been said, this does open things up to the possibility of source changes
 408          * allowing remote kills, etc - but if they have access to the src, they most likely have
 409          * access to the conf - so it's an end to a means either way.
 410          */
 411         if (!IS_LOCAL(this))
 412                 return true;
 413
 414         // are they even an oper at all?
 415         if (*this->oper)
 416         {
 417                 opertype_t::iterator iter_opertype = opertypes.find(this->oper);
 418                 if (iter_opertype != opertypes.end())
 419                 {
 420                         char* Classes = strdup(iter_opertype->second);
 421                         char* myclass = strtok_r(Classes," ",&savept);
 422                         while (myclass)
 423                         {
 424                                 operclass_t::iterator iter_operclass = operclass.find(myclass);
 425                                 if (iter_operclass != operclass.end())
 426                                 {
 427                                         char* CommandList = strdup(iter_operclass->second);
 428                                         mycmd = strtok_r(CommandList," ",&savept2);
 429                                         while (mycmd)
 430                                         {
 431                                                 if ((!strcasecmp(mycmd,command.c_str())) || (*mycmd == '*'))
 432                                                 {
 433                                                         free(Classes);
 434                                                         free(CommandList);
 435                                                         return true;
 436                                                 }
 437                                                 mycmd = strtok_r(NULL," ",&savept2);
 438                                         }
 439                                         free(CommandList);
 440                                 }
 441                                 myclass = strtok_r(NULL," ",&savept);
 442                         }
 443                         free(Classes);
 444                 }
 445         }
 446         return false;
 447 }
 448
 449
 450 bool userrec::AddBuffer(const std::string &a)
 451 {
 452         std::string b = "";
 453
 454         /* NB: std::string is arsey about \r and \n and tries to translate them
 455          * somehow, so we CANNOT use std::string::find() here :(
 456          */
 457         for (std::string::const_iterator i = a.begin(); i != a.end(); i++)
 458         {
 459                 if (*i != '\r')
 460                         b += *i;
 461         }
 462
 463         if (b.length())
 464                 recvq.append(b);
 465
 466         if (recvq.length() > (unsigned)this->recvqmax)
 467         {
 468                 this->SetWriteError("RecvQ exceeded");
 469                 WriteOpers("*** User %s RecvQ of %d exceeds connect class maximum of %d",this->nick,recvq.length(),this->recvqmax);
 470                 return false;
 471         }
 472
 473         return true;
 474 }
 475
 476 bool userrec::BufferIsReady()
 477 {
 478         return (recvq.find('\n') != std::string::npos);
 479 }
 480
 481 void userrec::ClearBuffer()
 482 {
 483         recvq = "";
 484 }
 485
 486 std::string userrec::GetBuffer()
 487 {
 488         if (!recvq.length())
 489                 return "";
 490
 491         /* Strip any leading \r or \n off the string.
 492          * Usually there are only one or two of these,
 493          * so its is computationally cheap to do.
 494          */
 495         while ((*recvq.begin() == '\r') || (*recvq.begin() == '\n'))
 496                 recvq.erase(recvq.begin());
 497
 498         for (std::string::iterator x = recvq.begin(); x != recvq.end(); x++)
 499         {
 500                 /* Find the first complete line, return it as the
 501                  * result, and leave the recvq as whats left
 502                  */
 503                 if (*x == '\n')
 504                 {
 505                         std::string ret = std::string(recvq.begin(), x);
 506                         recvq.erase(recvq.begin(), x + 1);
 507                         return ret;
 508                 }
 509         }
 510         return "";
 511 }
 512
 513 void userrec::AddWriteBuf(const std::string &data)
 514 {
 515         if (*this->GetWriteError())
 516                 return;
 517
 518         if (sendq.length() + data.length() > (unsigned)this->sendqmax)
 519         {
 520                 /*
 521                  * Fix by brain - Set the error text BEFORE calling writeopers, because
 522                  * if we dont it'll recursively  call here over and over again trying
 523                  * to repeatedly add the text to the sendq!
 524                  */
 525                 this->SetWriteError("SendQ exceeded");
 526                 WriteOpers("*** User %s SendQ of %d exceeds connect class maximum of %d",this->nick,sendq.length() + data.length(),this->sendqmax);
 527                 return;
 528         }
 529
 530         if (data.length() > 512)
 531         {
 532                 std::string newdata(data);
 533                 newdata.resize(510);
 534                 newdata.append("\r\n");
 535                 sendq.append(newdata);
 536         }
 537         else
 538         {
 539                 sendq.append(data);
 540         }
 541 }
 542
 543 // send AS MUCH OF THE USERS SENDQ as we are able to (might not be all of it)
 544 void userrec::FlushWriteBuf()
 545 {
 546         if ((sendq.length()) && (this->fd != FD_MAGIC_NUMBER))
 547         {
 548                 const char* tb = this->sendq.c_str();
 549                 int n_sent = write(this->fd,tb,this->sendq.length());
 550                 if (n_sent == -1)
 551                 {
 552                         if (errno != EAGAIN)
 553                                 this->SetWriteError(strerror(errno));
 554                 }
 555                 else
 556                 {
 557                         // advance the queue
 558                         tb += n_sent;
 559                         this->sendq = tb;
 560                         // update the user's stats counters
 561                         this->bytes_out += n_sent;
 562                         this->cmds_out++;
 563                 }
 564         }
 565 }
 566
 567 void userrec::SetWriteError(const std::string &error)
 568 {
 569         // don't try to set the error twice, its already set take the first string.
 570         if (!this->WriteError.length())
 571         {
 572                 log(DEBUG,"Setting error string for %s to '%s'",this->nick,error.c_str());
 573                 this->WriteError = error;
 574         }
 575 }
 576
 577 const char* userrec::GetWriteError()
 578 {
 579         return this->WriteError.c_str();
 580 }
 581
 582 void AddOper(userrec* user)
 583 {
 584         log(DEBUG,"Oper added to optimization list");
 585         all_opers.push_back(user);
 586 }
 587
 588 void DeleteOper(userrec* user)
 589 {
 590         for (std::vector<userrec*>::iterator a = all_opers.begin(); a < all_opers.end(); a++)
 591         {
 592                 if (*a == user)
 593                 {
 594                         log(DEBUG,"Oper removed from optimization list");
 595                         all_opers.erase(a);
 596                         return;
 597                 }
 598         }
 599 }
 600
 601 void kill_link(userrec *user,const char* r)
 602 {
 603         user_hash::iterator iter = clientlist.find(user->nick);
 604
 605 /*
 606  * I'm pretty sure returning here is causing a desync when part of the net thinks a user is gone,
 607  * and another part doesn't. We want to broadcast the quit/kill before bailing so the net stays in sync.
 608  *
 609  * I can't imagine this blowing up, so I'm commenting it out. We still check
 610  * before playing with a bad iterator below in our if(). DISCUSS THIS BEFORE YOU DO ANYTHING. --w00t
 611  *
 612  *      if (iter == clientlist.end())
 613  *              return;
 614  */
 615
 616         char reason[MAXBUF];
 617
 618         strlcpy(reason,r,MAXQUIT-1);
 619         log(DEBUG,"kill_link: %s %d '%s'",user->nick,user->fd,reason);
 620
 621         if (IS_LOCAL(user))
 622                 Write(user->fd,"ERROR :Closing link (%s@%s) [%s]",user->ident,user->host,reason);
 623
 624         if (user->registered == REG_ALL)
 625         {
 626                 purge_empty_chans(user);
 627                 FOREACH_MOD(I_OnUserQuit,OnUserQuit(user,reason));
 628                 WriteCommonExcept(user,"QUIT :%s",reason);
 629         }
 630
 631         if (IS_LOCAL(user))
 632                 user->FlushWriteBuf();
 633
 634         FOREACH_MOD(I_OnUserDisconnect,OnUserDisconnect(user));
 635
 636         if (IS_LOCAL(user))
 637         {
 638                 if (Config->GetIOHook(user->port))
 639                 {
 640                         try
 641                         {
 642                                 Config->GetIOHook(user->port)->OnRawSocketClose(user->fd);
 643                         }
 644                         catch (ModuleException& modexcept)
 645                         {
 646                                 log(DEBUG,"Module exception cought: %s",modexcept.GetReason());
 647                         }
 648                 }
 649
 650                 ServerInstance->SE->DelFd(user->fd);
 651                 user->CloseSocket();
 652         }
 653
 654         /*
 655          * this must come before the WriteOpers so that it doesnt try to fill their buffer with anything
 656          * if they were an oper with +s.
 657          *
 658          * XXX -
 659          * In the current implementation, we only show local quits, as we only show local connects. With
 660          * the proposed implmentation of snomasks however, this will likely change in the (near?) future.
 661          */
 662         if (user->registered == REG_ALL)
 663         {
 664                 if (IS_LOCAL(user))
 665                         WriteOpers("*** Client exiting: %s!%s@%s [%s]",user->nick,user->ident,user->host,reason);
 666                 AddWhoWas(user);
 667         }
 668
 669         if (iter != clientlist.end())
 670         {
 671                 log(DEBUG,"deleting user hash value %lx",(unsigned long)user);
 672                 if (IS_LOCAL(user))
 673                 {
 674                         fd_ref_table[user->fd] = NULL;
 675                         if (find(local_users.begin(),local_users.end(),user) != local_users.end())
 676                         {
 677                                 local_users.erase(find(local_users.begin(),local_users.end(),user));
 678                                 log(DEBUG,"Delete local user");
 679                         }
 680                 }
 681                 clientlist.erase(iter);
 682                 DELETE(user);
 683         }
 684 }
 685
 686 WhoWasGroup::WhoWasGroup(userrec* user) : host(NULL), dhost(NULL), ident(NULL), server(NULL), gecos(NULL), signon(user->signon)
 687 {
 688         this->host = strdup(user->host);
 689         this->dhost = strdup(user->dhost);
 690         this->ident = strdup(user->ident);
 691         this->server = user->server;
 692         this->gecos = strdup(user->fullname);
 693 }
 694
 695 WhoWasGroup::~WhoWasGroup()
 696 {
 697         if (host)
 698                 free(host);
 699         if (dhost)
 700                 free(dhost);
 701         if (ident)
 702                 free(ident);
 703         if (gecos)
 704                 free(gecos);
 705 }
 706
 707 /* adds or updates an entry in the whowas list */
 708 void AddWhoWas(userrec* u)
 709 {
 710         whowas_users::iterator iter = whowas.find(u->nick);
 711
 712         if (iter == whowas.end())
 713         {
 714                 whowas_set* n = new whowas_set;
 715                 WhoWasGroup *a = new WhoWasGroup(u);
 716                 n->push_back(a);
 717                 whowas[u->nick] = n;
 718         }
 719         else
 720         {
 721                 whowas_set* group = (whowas_set*)iter->second;
 722
 723                 if (group->size() > 10)
 724                 {
 725                         WhoWasGroup *a = (WhoWasGroup*)*(group->begin());
 726                         DELETE(a);
 727                         group->pop_front();
 728                 }
 729
 730                 WhoWasGroup *a = new WhoWasGroup(u);
 731                 group->push_back(a);
 732         }
 733 }
 734
 735 /* every hour, run this function which removes all entries over 3 days */
 736 void MaintainWhoWas(time_t TIME)
 737 {
 738         for (whowas_users::iterator iter = whowas.begin(); iter != whowas.end(); iter++)
 739         {
 740                 whowas_set* n = (whowas_set*)iter->second;
 741                 if (n->size())
 742                 {
 743                         while ((n->begin() != n->end()) && ((*n->begin())->signon < TIME - 259200)) // 3 days
 744                         {
 745                                 WhoWasGroup *a = *(n->begin());
 746                                 DELETE(a);
 747                                 n->erase(n->begin());
 748                         }
 749                 }
 750         }
 751 }
 752
 753 /* add a client connection to the sockets list */
 754 void AddClient(int socket, int port, bool iscached, insp_inaddr ip4)
 755 {
 756         std::string tempnick = ConvToStr(socket) + "-unknown";
 757         user_hash::iterator iter = clientlist.find(tempnick);
 758         const char *ipaddr = insp_ntoa(ip4);
 759         userrec* _new;
 760         int j = 0;
 761
 762         /*
 763          * fix by brain.
 764          * as these nicknames are 'RFC impossible', we can be sure nobody is going to be
 765          * using one as a registered connection. As they are per fd, we can also safely assume
 766          * that we wont have collisions. Therefore, if the nick exists in the list, its only
 767          * used by a dead socket, erase the iterator so that the new client may reclaim it.
 768          * this was probably the cause of 'server ignores me when i hammer it with reconnects'
 769          * issue in earlier alphas/betas
 770          */
 771         if (iter != clientlist.end())
 772         {
 773                 userrec* goner = iter->second;
 774                 DELETE(goner);
 775                 clientlist.erase(iter);
 776         }
 777
 778         log(DEBUG,"AddClient: %d %d %s",socket,port,ipaddr);
 779
 780         _new = new userrec();
 781         clientlist[tempnick] = _new;
 782         _new->fd = socket;
 783         strlcpy(_new->nick,tempnick.c_str(),NICKMAX-1);
 784
 785         /* Smarter than your average bear^H^H^H^Hset of strlcpys. */
 786         for (const char* temp = ipaddr; *temp && j < 64; temp++, j++)
 787                 _new->dhost[j] = _new->host[j] = *temp;
 788         _new->dhost[j] = _new->host[j] = 0;
 789
 790         _new->server = FindServerNamePtr(Config->ServerName);
 791         /* We don't need range checking here, we KNOW 'unknown\0' will fit into the ident field. */
 792         strcpy(_new->ident, "unknown");
 793
 794         _new->registered = REG_NONE;
 795         _new->signon = TIME + Config->dns_timeout;
 796         _new->lastping = 1;
 797         _new->ip4 = ip4;
 798         _new->port = port;
 799
 800         // set the registration timeout for this user
 801         unsigned long class_regtimeout = 90;
 802         int class_flood = 0;
 803         long class_threshold = 5;
 804         long class_sqmax = 262144;      // 256kb
 805         long class_rqmax = 4096;        // 4k
 806
 807         for (ClassVector::iterator i = Config->Classes.begin(); i != Config->Classes.end(); i++)
 808         {
 809                 if ((i->type == CC_ALLOW) && (match(ipaddr,i->host.c_str())))
 810                 {
 811                         class_regtimeout = (unsigned long)i->registration_timeout;
 812                         class_flood = i->flood;
 813                         _new->pingmax = i->pingtime;
 814                         class_threshold = i->threshold;
 815                         class_sqmax = i->sendqmax;
 816                         class_rqmax = i->recvqmax;
 817                         break;
 818                 }
 819         }
 820
 821         _new->nping = TIME + _new->pingmax + Config->dns_timeout;
 822         _new->timeout = TIME+class_regtimeout;
 823         _new->flood = class_flood;
 824         _new->threshold = class_threshold;
 825         _new->sendqmax = class_sqmax;
 826         _new->recvqmax = class_rqmax;
 827
 828         fd_ref_table[socket] = _new;
 829         local_users.push_back(_new);
 830
 831         if (local_users.size() > Config->SoftLimit)
 832         {
 833                 kill_link(_new,"No more connections allowed");
 834                 return;
 835         }
 836
 837         if (local_users.size() >= MAXCLIENTS)
 838         {
 839                 kill_link(_new,"No more connections allowed");
 840                 return;
 841         }
 842
 843         /*
 844          * XXX -
 845          * this is done as a safety check to keep the file descriptors within range of fd_ref_table.
 846          * its a pretty big but for the moment valid assumption:
 847          * file descriptors are handed out starting at 0, and are recycled as theyre freed.
 848          * therefore if there is ever an fd over 65535, 65536 clients must be connected to the
 849          * irc server at once (or the irc server otherwise initiating this many connections, files etc)
 850          * which for the time being is a physical impossibility (even the largest networks dont have more
 851          * than about 10,000 users on ONE server!)
 852          */
 853         if ((unsigned)socket >= MAX_DESCRIPTORS)
 854         {
 855                 kill_link(_new,"Server is full");
 856                 return;
 857         }
 858         char* e = matches_exception(ipaddr);
 859         if (!e)
 860         {
 861                 char* r = matches_zline(ipaddr);
 862                 if (r)
 863                 {
 864                         char reason[MAXBUF];
 865                         snprintf(reason,MAXBUF,"Z-Lined: %s",r);
 866                         kill_link(_new,reason);
 867                         return;
 868                 }
 869         }
 870
 871         if (socket > -1)
 872         {
 873                 ServerInstance->SE->AddFd(socket,true,X_ESTAB_CLIENT);
 874         }
 875
 876         WriteServ(_new->fd,"NOTICE Auth :*** Looking up your hostname...");
 877 }
 878
 879 long FindMatchingGlobal(userrec* user)
 880 {
 881         long x = 0;
 882         for (user_hash::const_iterator a = clientlist.begin(); a != clientlist.end(); a++)
 883         {
 884 #ifdef IPV6
 885                 /* I dont think theres any faster way of matching two ipv6 addresses than memcmp
 886                  * Let me know if you think of one.
 887                   */
 888                 if (!memcmp(a->second->ip4.s6_addr, user->ip4.s6_addr, sizeof(in6_addr)))
 889                         x++;
 890 #else
 891                 if (a->second->ip4.s_addr == user->ip4.s_addr)
 892                         x++;
 893 #endif
 894         }
 895         return x;
 896 }
 897
 898 long FindMatchingLocal(userrec* user)
 899 {
 900         long x = 0;
 901         for (std::vector<userrec*>::const_iterator a = local_users.begin(); a != local_users.end(); a++)
 902         {
 903                 userrec* comp = *a;
 904 #ifdef IPV6
 905                 /* I dont think theres any faster way of matching two ipv6 addresses than memcmp */
 906                 if (!memcmp(comp->ip4.s6_addr, user->ip4.s6_addr, sizeof(in6_addr)))
 907                         x++;
 908 #else
 909                 if (comp->ip4.s_addr == user->ip4.s_addr)
 910                         x++;
 911 #endif
 912         }
 913         return x;
 914 }
 915
 916 void FullConnectUser(userrec* user, CullList* Goners)
 917 {
 918         ServerInstance->stats->statsConnects++;
 919         user->idle_lastmsg = TIME;
 920         log(DEBUG,"ConnectUser: %s",user->nick);
 921
 922         ConnectClass a = GetClass(user);
 923
 924         if (a.type == CC_DENY)
 925         {
 926                 Goners->AddItem(user,"Unauthorised connection");
 927                 return;
 928         }
 929
 930         if ((*(a.pass.c_str())) && (!user->haspassed))
 931         {
 932                 Goners->AddItem(user,"Invalid password");
 933                 return;
 934         }
 935
 936         if (FindMatchingLocal(user) > a.maxlocal)
 937         {
 938                 Goners->AddItem(user,"No more connections allowed from your host via this connect class (local)");
 939                 WriteOpers("*** WARNING: maximum LOCAL connections (%ld) exceeded for IP %s",a.maxlocal,insp_ntoa(user->ip4));
 940                 return;
 941         }
 942         else if (FindMatchingGlobal(user) > a.maxglobal)
 943         {
 944                 Goners->AddItem(user,"No more connections allowed from your host via this connect class (global)");
 945                 WriteOpers("*** WARNING: maximum GLOBAL connections (%ld) exceeded for IP %s",a.maxglobal,insp_ntoa(user->ip4));
 946                 return;
 947         }
 948
 949         char match_against[MAXBUF];
 950         snprintf(match_against,MAXBUF,"%s@%s",user->ident,user->host);
 951         char* e = matches_exception(match_against);
 952
 953         if (!e)
 954         {
 955                 char* r = matches_gline(match_against);
 956
 957                 if (r)
 958                 {
 959                         char reason[MAXBUF];
 960                         snprintf(reason,MAXBUF,"G-Lined: %s",r);
 961                         Goners->AddItem(user,reason);
 962                         return;
 963                 }
 964
 965                 r = matches_kline(match_against);
 966
 967                 if (r)
 968                 {
 969                         char reason[MAXBUF];
 970                         snprintf(reason,MAXBUF,"K-Lined: %s",r);
 971                         Goners->AddItem(user,reason);
 972                         return;
 973                 }
 974         }
 975
 976
 977         WriteServ(user->fd,"NOTICE Auth :Welcome to \002%s\002!",Config->Network);
 978         WriteServ(user->fd,"001 %s :Welcome to the %s IRC Network %s!%s@%s",user->nick,Config->Network,user->nick,user->ident,user->host);
 979         WriteServ(user->fd,"002 %s :Your host is %s, running version %s",user->nick,Config->ServerName,VERSION);
 980         WriteServ(user->fd,"003 %s :This server was created %s %s",user->nick,__TIME__,__DATE__);
 981         WriteServ(user->fd,"004 %s %s %s iowghrasxRVSCWBG lvhopsmntikrcaqbegIOLQRSKVHGCNT vhobeIaqglk",user->nick,Config->ServerName,VERSION);
 982
 983         // anfl @ #ratbox, efnet reminded me that according to the RFC this cant contain more than 13 tokens per line...
 984         // so i'd better split it :)
 985         std::stringstream out(Config->data005);
 986         std::string token = "";
 987         std::string line5 = "";
 988         int token_counter = 0;
 989
 990         while (!out.eof())
 991         {
 992                 out >> token;
 993                 line5 = line5 + token + " ";
 994                 token_counter++;
 995
 996                 if ((token_counter >= 13) || (out.eof() == true))
 997                 {
 998                         WriteServ(user->fd,"005 %s %s:are supported by this server",user->nick,line5.c_str());
 999                         line5 = "";
1000                         token_counter = 0;
1001                 }
1002         }
1003
1004         ShowMOTD(user);
1005
1006         /*
1007          * fix 3 by brain, move registered = 7 below these so that spurious modes and host
1008          * changes dont go out onto the network and produce 'fake direction'.
1009          */
1010         FOREACH_MOD(I_OnUserConnect,OnUserConnect(user));
1011         FOREACH_MOD(I_OnGlobalConnect,OnGlobalConnect(user));
1012         user->registered = REG_ALL;
1013         WriteOpers("*** Client connecting on port %lu: %s!%s@%s [%s]",(unsigned long)user->port,user->nick,user->ident,user->host,insp_ntoa(user->ip4));
1014 }
1015
1016 /** ReHashNick()
1017  * re-allocates a nick in the user_hash after they change nicknames,
1018  * returns a pointer to the new user as it may have moved
1019  */
1020 userrec* ReHashNick(const char* Old, const char* New)
1021 {
1022         //user_hash::iterator newnick;
1023         user_hash::iterator oldnick = clientlist.find(Old);
1024
1025         log(DEBUG,"ReHashNick: %s %s",Old,New);
1026
1027         if (!strcasecmp(Old,New))
1028         {
1029                 log(DEBUG,"old nick is new nick, skipping");
1030                 return oldnick->second;
1031         }
1032
1033         if (oldnick == clientlist.end())
1034                 return NULL; /* doesnt exist */
1035
1036         log(DEBUG,"ReHashNick: Found hashed nick %s",Old);
1037
1038         userrec* olduser = oldnick->second;
1039         clientlist[New] = olduser;
1040         clientlist.erase(oldnick);
1041
1042         log(DEBUG,"ReHashNick: Nick rehashed as %s",New);
1043
1044         return clientlist[New];
1045 }
1046
1047 void force_nickchange(userrec* user,const char* newnick)
1048 {
1049         char nick[MAXBUF];
1050         int MOD_RESULT = 0;
1051
1052         *nick = 0;
1053
1054         FOREACH_RESULT(I_OnUserPreNick,OnUserPreNick(user,newnick));
1055
1056         if (MOD_RESULT)
1057         {
1058                 ServerInstance->stats->statsCollisions++;
1059                 kill_link(user,"Nickname collision");
1060                 return;
1061         }
1062
1063         if (matches_qline(newnick))
1064         {
1065                 ServerInstance->stats->statsCollisions++;
1066                 kill_link(user,"Nickname collision");
1067                 return;
1068         }
1069
1070         if (user)
1071         {
1072                 if (newnick)
1073                 {
1074                         strlcpy(nick,newnick,MAXBUF-1);
1075                 }
1076
1077                 if (user->registered == REG_ALL)
1078                 {
1079                         const char* pars[1];
1080                         pars[0] = nick;
1081                         std::string cmd = "NICK";
1082
1083                         ServerInstance->Parser->CallHandler(cmd,pars,1,user);
1084                 }
1085         }
1086 }