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