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