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 extern Server* MyServer;
  52
  53 whowas_users whowas;
  54
  55 extern std::vector<userrec*> local_users;
  56
  57 std::vector<userrec*> all_opers;
  58
  59 typedef std::map<irc::string,char*> opertype_t;
  60 typedef opertype_t operclass_t;
  61
  62 opertype_t opertypes;
  63 operclass_t operclass;
  64
  65 bool InitTypes(const char* tag)
  66 {
  67         for (opertype_t::iterator n = opertypes.begin(); n != opertypes.end(); n++)
  68         {
  69                 if (n->second)
  70                         delete[] n->second;
  71         }
  72
  73         opertypes.clear();
  74         return true;
  75 }
  76
  77 bool InitClasses(const char* tag)
  78 {
  79         for (operclass_t::iterator n = operclass.begin(); n != operclass.end(); n++)
  80         {
  81                 if (n->second)
  82                         delete[] n->second;
  83         }
  84
  85         operclass.clear();
  86         return true;
  87 }
  88
  89 bool DoType(const char* tag, char** entries, void** values, int* types)
  90 {
  91         char* TypeName = (char*)values[0];
  92         char* Classes = (char*)values[1];
  93
  94         opertypes[TypeName] = strdup(Classes);
  95         log(DEBUG,"Read oper TYPE '%s' with classes '%s'",TypeName,Classes);
  96         return true;
  97 }
  98
  99 bool DoClass(const char* tag, char** entries, void** values, int* types)
 100 {
 101         char* ClassName = (char*)values[0];
 102         char* CommandList = (char*)values[1];
 103
 104         operclass[ClassName] = strdup(CommandList);
 105         log(DEBUG,"Read oper CLASS '%s' with commands '%s'",ClassName,CommandList);
 106         return true;
 107 }
 108
 109 bool DoneClassesAndTypes(const char* tag)
 110 {
 111         return true;
 112 }
 113
 114 bool userrec::ProcessNoticeMasks(const char *sm)
 115 {
 116         bool adding = true;
 117         const char *c = sm;
 118
 119         while (c && *c)
 120         {
 121                 switch (*c)
 122                 {
 123                         case '+':
 124                                 adding = true;
 125                                 break;
 126                         case '-':
 127                                 adding = false;
 128                                 break;
 129                         default:
 130                                 if ((*c >= 'A') && (*c <= 'z'))
 131                                         this->SetNoticeMask(*c, adding);
 132                                 break;
 133                 }
 134
 135                 *c++;
 136         }
 137
 138         return true;
 139 }
 140
 141 void userrec::StartDNSLookup()
 142 {
 143         log(DEBUG,"Commencing forward lookup");
 144         res_reverse = new UserResolver(this, insp_ntoa(this->ip4), false);
 145         MyServer->AddResolver(res_reverse);
 146 }
 147
 148 UserResolver::UserResolver(userrec* user, std::string to_resolve, bool forward) : Resolver(to_resolve, forward), bound_user(user)
 149 {
 150         this->bound_fd = user->fd;
 151 }
 152
 153 void UserResolver::OnLookupComplete(const std::string &result)
 154 {
 155         if ((!this->fwd) && (fd_ref_table[this->bound_fd] == this->bound_user))
 156         {
 157                 log(DEBUG,"Commencing reverse lookup");
 158                 this->bound_user->stored_host = result;
 159                 bound_user->res_forward = new UserResolver(this->bound_user, result, true);
 160                 MyServer->AddResolver(bound_user->res_forward);
 161         }
 162         else if ((this->fwd) && (fd_ref_table[this->bound_fd] == this->bound_user))
 163         {
 164                 /* Both lookups completed */
 165                 if (insp_ntoa(this->bound_user->ip4) == result)
 166                 {
 167                         std::string hostname = this->bound_user->stored_host;
 168                         if (hostname.length() < 64)
 169                         {
 170                                 WriteServ(this->bound_fd, "*** Found your hostname (%s)", this->bound_user->stored_host.c_str());
 171                                 this->bound_user->dns_done = true;
 172                                 strlcpy(this->bound_user->dhost, hostname.c_str(),64);
 173                                 strlcpy(this->bound_user->host, hostname.c_str(),64);
 174                         }
 175                 }
 176         }
 177 }
 178
 179 void UserResolver::OnError(ResolverError e)
 180 {
 181         if (fd_ref_table[this->bound_fd] == this->bound_user)
 182         {
 183                 /* Error message here */
 184                 WriteServ(this->bound_fd, "*** Could not resolve your hostname, using your IP address (%s) instead.", insp_ntoa(this->bound_user->ip4));
 185                 this->bound_user->dns_done = true;
 186         }
 187 }
 188
 189
 190 bool userrec::IsNoticeMaskSet(unsigned char sm)
 191 {
 192         return (snomasks[sm-65]);
 193 }
 194
 195 void userrec::SetNoticeMask(unsigned char sm, bool value)
 196 {
 197         snomasks[sm-65] = value;
 198 }
 199
 200 const char* userrec::FormatNoticeMasks()
 201 {
 202         static char data[MAXBUF];
 203         int offset = 0;
 204
 205         for (int n = 0; n < 64; n++)
 206         {
 207                 if (snomasks[n])
 208                         data[offset++] = n+65;
 209         }
 210
 211         data[offset] = 0;
 212         return data;
 213 }
 214
 215
 216
 217 bool userrec::IsModeSet(unsigned char m)
 218 {
 219         return (modes[m-65]);
 220 }
 221
 222 void userrec::SetMode(unsigned char m, bool value)
 223 {
 224         modes[m-65] = value;
 225 }
 226
 227 const char* userrec::FormatModes()
 228 {
 229         static char data[MAXBUF];
 230         int offset = 0;
 231         for (int n = 0; n < 64; n++)
 232         {
 233                 if (modes[n])
 234                         data[offset++] = n+65;
 235         }
 236         data[offset] = 0;
 237         return data;
 238 }
 239
 240 userrec::userrec()
 241 {
 242         // the PROPER way to do it, AVOID bzero at *ALL* costs
 243         *password = *nick = *ident = *host = *dhost = *fullname = *awaymsg = *oper = 0;
 244         server = (char*)FindServerNamePtr(Config->ServerName);
 245         reset_due = TIME;
 246         lines_in = fd = lastping = signon = idle_lastmsg = nping = registered = 0;
 247         timeout = flood = port = bytes_in = bytes_out = cmds_in = cmds_out = 0;
 248         haspassed = dns_done = false;
 249         recvq = "";
 250         sendq = "";
 251         res_forward = res_reverse = NULL;
 252         chans.clear();
 253         invites.clear();
 254         chans.resize(MAXCHANS);
 255         memset(modes,0,sizeof(modes));
 256
 257         for (unsigned int n = 0; n < MAXCHANS; n++)
 258         {
 259                 ucrec* x = new ucrec();
 260                 chans[n] = x;
 261                 x->channel = NULL;
 262                 x->uc_modes = 0;
 263         }
 264 }
 265
 266 userrec::~userrec()
 267 {
 268         for (std::vector<ucrec*>::iterator n = chans.begin(); n != chans.end(); n++)
 269         {
 270                 ucrec* x = (ucrec*)*n;
 271                 delete x;
 272         }
 273 #ifdef THREADED_DNS
 274         if ((IS_LOCAL(this)) && (!dns_done) && (registered >= REG_NICKUSER))
 275         {
 276                 pthread_kill(this->dnsthread, SIGTERM);
 277         }
 278 #endif
 279 }
 280
 281 /* XXX - minor point, other *Host functions return a char *, this one creates it. Might be nice to be consistant? */
 282 void userrec::MakeHost(char* nhost)
 283 {
 284         /* This is much faster than snprintf */
 285         char* t = nhost;
 286         for(char* n = ident; *n; n++)
 287                 *t++ = *n;
 288         *t++ = '@';
 289         for(char* n = host; *n; n++)
 290                 *t++ = *n;
 291         *t = 0;
 292 }
 293
 294 void userrec::CloseSocket()
 295 {
 296         shutdown(this->fd,2);
 297         close(this->fd);
 298 }
 299
 300 char* userrec::GetFullHost()
 301 {
 302         static char result[MAXBUF];
 303         char* t = result;
 304         for(char* n = nick; *n; n++)
 305                 *t++ = *n;
 306         *t++ = '!';
 307         for(char* n = ident; *n; n++)
 308                 *t++ = *n;
 309         *t++ = '@';
 310         for(char* n = dhost; *n; n++)
 311                 *t++ = *n;
 312         *t = 0;
 313         return result;
 314 }
 315
 316 char* userrec::MakeWildHost()
 317 {
 318         static char nresult[MAXBUF];
 319         char* t = nresult;
 320         *t++ = '*';     *t++ = '!';
 321         *t++ = '*';     *t++ = '@';
 322         for(char* n = dhost; *n; n++)
 323                 *t++ = *n;
 324         *t = 0;
 325         return nresult;
 326 }
 327
 328 int userrec::ReadData(void* buffer, size_t size)
 329 {
 330         if (this->fd > -1)
 331         {
 332                 return read(this->fd, buffer, size);
 333         }
 334         else
 335                 return 0;
 336 }
 337
 338
 339 char* userrec::GetFullRealHost()
 340 {
 341         static char fresult[MAXBUF];
 342         char* t = fresult;
 343         for(char* n = nick; *n; n++)
 344                 *t++ = *n;
 345         *t++ = '!';
 346         for(char* n = ident; *n; n++)
 347                 *t++ = *n;
 348         *t++ = '@';
 349         for(char* n = host; *n; n++)
 350                 *t++ = *n;
 351         *t = 0;
 352         return fresult;
 353 }
 354
 355 bool userrec::IsInvited(irc::string &channel)
 356 {
 357         for (InvitedList::iterator i = invites.begin(); i != invites.end(); i++)
 358         {
 359                 irc::string compare = i->channel;
 360
 361                 if (compare == channel)
 362                 {
 363                         return true;
 364                 }
 365         }
 366         return false;
 367 }
 368
 369 InvitedList* userrec::GetInviteList()
 370 {
 371         return &invites;
 372 }
 373
 374 void userrec::InviteTo(irc::string &channel)
 375 {
 376         Invited i;
 377         i.channel = channel;
 378         invites.push_back(i);
 379 }
 380
 381 void userrec::RemoveInvite(irc::string &channel)
 382 {
 383         log(DEBUG,"Removing invites");
 384
 385         if (invites.size())
 386         {
 387                 for (InvitedList::iterator i = invites.begin(); i != invites.end(); i++)
 388                 {
 389                         irc::string compare = i->channel;
 390
 391                         if (compare == channel)
 392                         {
 393                                 invites.erase(i);
 394                                 return;
 395                         }
 396                 }
 397         }
 398 }
 399
 400 bool userrec::HasPermission(const std::string &command)
 401 {
 402         char* mycmd;
 403         char* savept;
 404         char* savept2;
 405
 406         /*
 407          * users on remote servers can completely bypass all permissions based checks.
 408          * This prevents desyncs when one server has different type/class tags to another.
 409          * That having been said, this does open things up to the possibility of source changes
 410          * allowing remote kills, etc - but if they have access to the src, they most likely have
 411          * access to the conf - so it's an end to a means either way.
 412          */
 413         if (!IS_LOCAL(this))
 414                 return true;
 415
 416         // are they even an oper at all?
 417         if (*this->oper)
 418         {
 419                 opertype_t::iterator iter_opertype = opertypes.find(this->oper);
 420                 if (iter_opertype != opertypes.end())
 421                 {
 422                         char* Classes = strdup(iter_opertype->second);
 423                         char* myclass = strtok_r(Classes," ",&savept);
 424                         while (myclass)
 425                         {
 426                                 operclass_t::iterator iter_operclass = operclass.find(myclass);
 427                                 if (iter_operclass != operclass.end())
 428                                 {
 429                                         char* CommandList = strdup(iter_operclass->second);
 430                                         mycmd = strtok_r(CommandList," ",&savept2);
 431                                         while (mycmd)
 432                                         {
 433                                                 if ((!strcasecmp(mycmd,command.c_str())) || (*mycmd == '*'))
 434                                                 {
 435                                                         free(Classes);
 436                                                         free(CommandList);
 437                                                         return true;
 438                                                 }
 439                                                 mycmd = strtok_r(NULL," ",&savept2);
 440                                         }
 441                                         free(CommandList);
 442                                 }
 443                                 myclass = strtok_r(NULL," ",&savept);
 444                         }
 445                         free(Classes);
 446                 }
 447         }
 448         return false;
 449 }
 450
 451
 452 bool userrec::AddBuffer(const std::string &a)
 453 {
 454         std::string b = "";
 455
 456         /* NB: std::string is arsey about \r and \n and tries to translate them
 457          * somehow, so we CANNOT use std::string::find() here :(
 458          */
 459         for (std::string::const_iterator i = a.begin(); i != a.end(); i++)
 460         {
 461                 if (*i != '\r')
 462                         b += *i;
 463         }
 464
 465         if (b.length())
 466                 recvq.append(b);
 467
 468         if (recvq.length() > (unsigned)this->recvqmax)
 469         {
 470                 this->SetWriteError("RecvQ exceeded");
 471                 WriteOpers("*** User %s RecvQ of %d exceeds connect class maximum of %d",this->nick,recvq.length(),this->recvqmax);
 472                 return false;
 473         }
 474
 475         return true;
 476 }
 477
 478 bool userrec::BufferIsReady()
 479 {
 480         return (recvq.find('\n') != std::string::npos);
 481 }
 482
 483 void userrec::ClearBuffer()
 484 {
 485         recvq = "";
 486 }
 487
 488 std::string userrec::GetBuffer()
 489 {
 490         if (!recvq.length())
 491                 return "";
 492
 493         /* Strip any leading \r or \n off the string.
 494          * Usually there are only one or two of these,
 495          * so its is computationally cheap to do.
 496          */
 497         while ((*recvq.begin() == '\r') || (*recvq.begin() == '\n'))
 498                 recvq.erase(recvq.begin());
 499
 500         for (std::string::iterator x = recvq.begin(); x != recvq.end(); x++)
 501         {
 502                 /* Find the first complete line, return it as the
 503                  * result, and leave the recvq as whats left
 504                  */
 505                 if (*x == '\n')
 506                 {
 507                         std::string ret = std::string(recvq.begin(), x);
 508                         recvq.erase(recvq.begin(), x + 1);
 509                         return ret;
 510                 }
 511         }
 512         return "";
 513 }
 514
 515 void userrec::AddWriteBuf(const std::string &data)
 516 {
 517         if (*this->GetWriteError())
 518                 return;
 519
 520         if (sendq.length() + data.length() > (unsigned)this->sendqmax)
 521         {
 522                 /*
 523                  * Fix by brain - Set the error text BEFORE calling writeopers, because
 524                  * if we dont it'll recursively  call here over and over again trying
 525                  * to repeatedly add the text to the sendq!
 526                  */
 527                 this->SetWriteError("SendQ exceeded");
 528                 WriteOpers("*** User %s SendQ of %d exceeds connect class maximum of %d",this->nick,sendq.length() + data.length(),this->sendqmax);
 529                 return;
 530         }
 531
 532         if (data.length() > 512)
 533         {
 534                 std::string newdata(data);
 535                 newdata.resize(510);
 536                 newdata.append("\r\n");
 537                 sendq.append(newdata);
 538         }
 539         else
 540         {
 541                 sendq.append(data);
 542         }
 543 }
 544
 545 // send AS MUCH OF THE USERS SENDQ as we are able to (might not be all of it)
 546 void userrec::FlushWriteBuf()
 547 {
 548         if ((sendq.length()) && (this->fd != FD_MAGIC_NUMBER))
 549         {
 550                 const char* tb = this->sendq.c_str();
 551                 int n_sent = write(this->fd,tb,this->sendq.length());
 552                 if (n_sent == -1)
 553                 {
 554                         if (errno != EAGAIN)
 555                                 this->SetWriteError(strerror(errno));
 556                 }
 557                 else
 558                 {
 559                         // advance the queue
 560                         tb += n_sent;
 561                         this->sendq = tb;
 562                         // update the user's stats counters
 563                         this->bytes_out += n_sent;
 564                         this->cmds_out++;
 565                 }
 566         }
 567 }
 568
 569 void userrec::SetWriteError(const std::string &error)
 570 {
 571         // don't try to set the error twice, its already set take the first string.
 572         if (!this->WriteError.length())
 573         {
 574                 log(DEBUG,"Setting error string for %s to '%s'",this->nick,error.c_str());
 575                 this->WriteError = error;
 576         }
 577 }
 578
 579 const char* userrec::GetWriteError()
 580 {
 581         return this->WriteError.c_str();
 582 }
 583
 584 void AddOper(userrec* user)
 585 {
 586         log(DEBUG,"Oper added to optimization list");
 587         all_opers.push_back(user);
 588 }
 589
 590 void DeleteOper(userrec* user)
 591 {
 592         for (std::vector<userrec*>::iterator a = all_opers.begin(); a < all_opers.end(); a++)
 593         {
 594                 if (*a == user)
 595                 {
 596                         log(DEBUG,"Oper removed from optimization list");
 597                         all_opers.erase(a);
 598                         return;
 599                 }
 600         }
 601 }
 602
 603 void kill_link(userrec *user,const char* r)
 604 {
 605         user_hash::iterator iter = clientlist.find(user->nick);
 606
 607 /*
 608  * I'm pretty sure returning here is causing a desync when part of the net thinks a user is gone,
 609  * and another part doesn't. We want to broadcast the quit/kill before bailing so the net stays in sync.
 610  *
 611  * I can't imagine this blowing up, so I'm commenting it out. We still check
 612  * before playing with a bad iterator below in our if(). DISCUSS THIS BEFORE YOU DO ANYTHING. --w00t
 613  *
 614  *      if (iter == clientlist.end())
 615  *              return;
 616  */
 617
 618         char reason[MAXBUF];
 619
 620         strlcpy(reason,r,MAXQUIT-1);
 621         log(DEBUG,"kill_link: %s %d '%s'",user->nick,user->fd,reason);
 622
 623         if (IS_LOCAL(user))
 624                 Write(user->fd,"ERROR :Closing link (%s@%s) [%s]",user->ident,user->host,reason);
 625
 626         if (user->registered == REG_ALL)
 627         {
 628                 purge_empty_chans(user);
 629                 FOREACH_MOD(I_OnUserQuit,OnUserQuit(user,reason));
 630                 WriteCommonExcept(user,"QUIT :%s",reason);
 631         }
 632
 633         if (IS_LOCAL(user))
 634                 user->FlushWriteBuf();
 635
 636         FOREACH_MOD(I_OnUserDisconnect,OnUserDisconnect(user));
 637
 638         if (IS_LOCAL(user))
 639         {
 640                 if (Config->GetIOHook(user->port))
 641                 {
 642                         try
 643                         {
 644                                 Config->GetIOHook(user->port)->OnRawSocketClose(user->fd);
 645                         }
 646                         catch (ModuleException& modexcept)
 647                         {
 648                                 log(DEBUG,"Module exception cought: %s",modexcept.GetReason());
 649                         }
 650                 }
 651
 652                 ServerInstance->SE->DelFd(user->fd);
 653                 user->CloseSocket();
 654         }
 655
 656         /*
 657          * this must come before the WriteOpers so that it doesnt try to fill their buffer with anything
 658          * if they were an oper with +s.
 659          *
 660          * XXX -
 661          * In the current implementation, we only show local quits, as we only show local connects. With
 662          * the proposed implmentation of snomasks however, this will likely change in the (near?) future.
 663          */
 664         if (user->registered == REG_ALL)
 665         {
 666                 if (IS_LOCAL(user))
 667                         WriteOpers("*** Client exiting: %s!%s@%s [%s]",user->nick,user->ident,user->host,reason);
 668                 AddWhoWas(user);
 669         }
 670
 671         if (iter != clientlist.end())
 672         {
 673                 log(DEBUG,"deleting user hash value %lx",(unsigned long)user);
 674                 if (IS_LOCAL(user))
 675                 {
 676                         fd_ref_table[user->fd] = NULL;
 677                         if (find(local_users.begin(),local_users.end(),user) != local_users.end())
 678                         {
 679                                 local_users.erase(find(local_users.begin(),local_users.end(),user));
 680                                 log(DEBUG,"Delete local user");
 681                         }
 682                 }
 683                 clientlist.erase(iter);
 684                 DELETE(user);
 685         }
 686 }
 687
 688 WhoWasGroup::WhoWasGroup(userrec* user) : host(NULL), dhost(NULL), ident(NULL), server(NULL), gecos(NULL), signon(user->signon)
 689 {
 690         this->host = strdup(user->host);
 691         this->dhost = strdup(user->dhost);
 692         this->ident = strdup(user->ident);
 693         this->server = user->server;
 694         this->gecos = strdup(user->fullname);
 695 }
 696
 697 WhoWasGroup::~WhoWasGroup()
 698 {
 699         if (host)
 700                 free(host);
 701         if (dhost)
 702                 free(dhost);
 703         if (ident)
 704                 free(ident);
 705         if (gecos)
 706                 free(gecos);
 707 }
 708
 709 /* adds or updates an entry in the whowas list */
 710 void AddWhoWas(userrec* u)
 711 {
 712         whowas_users::iterator iter = whowas.find(u->nick);
 713
 714         if (iter == whowas.end())
 715         {
 716                 whowas_set* n = new whowas_set;
 717                 WhoWasGroup *a = new WhoWasGroup(u);
 718                 n->push_back(a);
 719                 whowas[u->nick] = n;
 720         }
 721         else
 722         {
 723                 whowas_set* group = (whowas_set*)iter->second;
 724
 725                 if (group->size() > 10)
 726                 {
 727                         WhoWasGroup *a = (WhoWasGroup*)*(group->begin());
 728                         DELETE(a);
 729                         group->pop_front();
 730                 }
 731
 732                 WhoWasGroup *a = new WhoWasGroup(u);
 733                 group->push_back(a);
 734         }
 735 }
 736
 737 /* every hour, run this function which removes all entries over 3 days */
 738 void MaintainWhoWas(time_t TIME)
 739 {
 740         for (whowas_users::iterator iter = whowas.begin(); iter != whowas.end(); iter++)
 741         {
 742                 whowas_set* n = (whowas_set*)iter->second;
 743                 if (n->size())
 744                 {
 745                         while ((n->begin() != n->end()) && ((*n->begin())->signon < TIME - 259200)) // 3 days
 746                         {
 747                                 WhoWasGroup *a = *(n->begin());
 748                                 DELETE(a);
 749                                 n->erase(n->begin());
 750                         }
 751                 }
 752         }
 753 }
 754
 755 /* add a client connection to the sockets list */
 756 void AddClient(int socket, int port, bool iscached, insp_inaddr ip4)
 757 {
 758         std::string tempnick = ConvToStr(socket) + "-unknown";
 759         user_hash::iterator iter = clientlist.find(tempnick);
 760         const char *ipaddr = insp_ntoa(ip4);
 761         userrec* _new;
 762         int j = 0;
 763
 764         /*
 765          * fix by brain.
 766          * as these nicknames are 'RFC impossible', we can be sure nobody is going to be
 767          * using one as a registered connection. As they are per fd, we can also safely assume
 768          * that we wont have collisions. Therefore, if the nick exists in the list, its only
 769          * used by a dead socket, erase the iterator so that the new client may reclaim it.
 770          * this was probably the cause of 'server ignores me when i hammer it with reconnects'
 771          * issue in earlier alphas/betas
 772          */
 773         if (iter != clientlist.end())
 774         {
 775                 userrec* goner = iter->second;
 776                 DELETE(goner);
 777                 clientlist.erase(iter);
 778         }
 779
 780         log(DEBUG,"AddClient: %d %d %s",socket,port,ipaddr);
 781
 782         _new = new userrec();
 783         clientlist[tempnick] = _new;
 784         _new->fd = socket;
 785         strlcpy(_new->nick,tempnick.c_str(),NICKMAX-1);
 786
 787         /* Smarter than your average bear^H^H^H^Hset of strlcpys. */
 788         for (const char* temp = ipaddr; *temp && j < 64; temp++, j++)
 789                 _new->dhost[j] = _new->host[j] = *temp;
 790         _new->dhost[j] = _new->host[j] = 0;
 791
 792         _new->server = FindServerNamePtr(Config->ServerName);
 793         /* We don't need range checking here, we KNOW 'unknown\0' will fit into the ident field. */
 794         strcpy(_new->ident, "unknown");
 795
 796         _new->registered = REG_NONE;
 797         _new->signon = TIME + Config->dns_timeout;
 798         _new->lastping = 1;
 799         _new->ip4 = ip4;
 800         _new->port = port;
 801
 802         // set the registration timeout for this user
 803         unsigned long class_regtimeout = 90;
 804         int class_flood = 0;
 805         long class_threshold = 5;
 806         long class_sqmax = 262144;      // 256kb
 807         long class_rqmax = 4096;        // 4k
 808
 809         for (ClassVector::iterator i = Config->Classes.begin(); i != Config->Classes.end(); i++)
 810         {
 811                 if ((i->type == CC_ALLOW) && (match(ipaddr,i->host.c_str())))
 812                 {
 813                         class_regtimeout = (unsigned long)i->registration_timeout;
 814                         class_flood = i->flood;
 815                         _new->pingmax = i->pingtime;
 816                         class_threshold = i->threshold;
 817                         class_sqmax = i->sendqmax;
 818                         class_rqmax = i->recvqmax;
 819                         break;
 820                 }
 821         }
 822
 823         _new->nping = TIME + _new->pingmax + Config->dns_timeout;
 824         _new->timeout = TIME+class_regtimeout;
 825         _new->flood = class_flood;
 826         _new->threshold = class_threshold;
 827         _new->sendqmax = class_sqmax;
 828         _new->recvqmax = class_rqmax;
 829
 830         fd_ref_table[socket] = _new;
 831         local_users.push_back(_new);
 832
 833         if (local_users.size() > Config->SoftLimit)
 834         {
 835                 kill_link(_new,"No more connections allowed");
 836                 return;
 837         }
 838
 839         if (local_users.size() >= MAXCLIENTS)
 840         {
 841                 kill_link(_new,"No more connections allowed");
 842                 return;
 843         }
 844
 845         /*
 846          * XXX -
 847          * this is done as a safety check to keep the file descriptors within range of fd_ref_table.
 848          * its a pretty big but for the moment valid assumption:
 849          * file descriptors are handed out starting at 0, and are recycled as theyre freed.
 850          * therefore if there is ever an fd over 65535, 65536 clients must be connected to the
 851          * irc server at once (or the irc server otherwise initiating this many connections, files etc)
 852          * which for the time being is a physical impossibility (even the largest networks dont have more
 853          * than about 10,000 users on ONE server!)
 854          */
 855         if ((unsigned)socket >= MAX_DESCRIPTORS)
 856         {
 857                 kill_link(_new,"Server is full");
 858                 return;
 859         }
 860         char* e = matches_exception(ipaddr);
 861         if (!e)
 862         {
 863                 char* r = matches_zline(ipaddr);
 864                 if (r)
 865                 {
 866                         char reason[MAXBUF];
 867                         snprintf(reason,MAXBUF,"Z-Lined: %s",r);
 868                         kill_link(_new,reason);
 869                         return;
 870                 }
 871         }
 872
 873         if (socket > -1)
 874         {
 875                 ServerInstance->SE->AddFd(socket,true,X_ESTAB_CLIENT);
 876         }
 877
 878         WriteServ(_new->fd,"NOTICE Auth :*** Looking up your hostname...");
 879 }
 880
 881 long FindMatchingGlobal(userrec* user)
 882 {
 883         long x = 0;
 884         for (user_hash::const_iterator a = clientlist.begin(); a != clientlist.end(); a++)
 885         {
 886 #ifdef IPV6
 887                 /* I dont think theres any faster way of matching two ipv6 addresses than memcmp
 888                  * Let me know if you think of one.
 889                   */
 890                 if (!memcmp(a->second->ip4.s6_addr, user->ip4.s6_addr, sizeof(in6_addr)))
 891                         x++;
 892 #else
 893                 if (a->second->ip4.s_addr == user->ip4.s_addr)
 894                         x++;
 895 #endif
 896         }
 897         return x;
 898 }
 899
 900 long FindMatchingLocal(userrec* user)
 901 {
 902         long x = 0;
 903         for (std::vector<userrec*>::const_iterator a = local_users.begin(); a != local_users.end(); a++)
 904         {
 905                 userrec* comp = *a;
 906 #ifdef IPV6
 907                 /* I dont think theres any faster way of matching two ipv6 addresses than memcmp */
 908                 if (!memcmp(comp->ip4.s6_addr, user->ip4.s6_addr, sizeof(in6_addr)))
 909                         x++;
 910 #else
 911                 if (comp->ip4.s_addr == user->ip4.s_addr)
 912                         x++;
 913 #endif
 914         }
 915         return x;
 916 }
 917
 918 void FullConnectUser(userrec* user, CullList* Goners)
 919 {
 920         ServerInstance->stats->statsConnects++;
 921         user->idle_lastmsg = TIME;
 922         log(DEBUG,"ConnectUser: %s",user->nick);
 923
 924         ConnectClass a = GetClass(user);
 925
 926         if (a.type == CC_DENY)
 927         {
 928                 Goners->AddItem(user,"Unauthorised connection");
 929                 return;
 930         }
 931
 932         if ((*(a.pass.c_str())) && (!user->haspassed))
 933         {
 934                 Goners->AddItem(user,"Invalid password");
 935                 return;
 936         }
 937
 938         if (FindMatchingLocal(user) > a.maxlocal)
 939         {
 940                 Goners->AddItem(user,"No more connections allowed from your host via this connect class (local)");
 941                 WriteOpers("*** WARNING: maximum LOCAL connections (%ld) exceeded for IP %s",a.maxlocal,insp_ntoa(user->ip4));
 942                 return;
 943         }
 944         else if (FindMatchingGlobal(user) > a.maxglobal)
 945         {
 946                 Goners->AddItem(user,"No more connections allowed from your host via this connect class (global)");
 947                 WriteOpers("*** WARNING: maximum GLOBAL connections (%ld) exceeded for IP %s",a.maxglobal,insp_ntoa(user->ip4));
 948                 return;
 949         }
 950
 951         char match_against[MAXBUF];
 952         snprintf(match_against,MAXBUF,"%s@%s",user->ident,user->host);
 953         char* e = matches_exception(match_against);
 954
 955         if (!e)
 956         {
 957                 char* r = matches_gline(match_against);
 958
 959                 if (r)
 960                 {
 961                         char reason[MAXBUF];
 962                         snprintf(reason,MAXBUF,"G-Lined: %s",r);
 963                         Goners->AddItem(user,reason);
 964                         return;
 965                 }
 966
 967                 r = matches_kline(match_against);
 968
 969                 if (r)
 970                 {
 971                         char reason[MAXBUF];
 972                         snprintf(reason,MAXBUF,"K-Lined: %s",r);
 973                         Goners->AddItem(user,reason);
 974                         return;
 975                 }
 976         }
 977
 978
 979         WriteServ(user->fd,"NOTICE Auth :Welcome to \002%s\002!",Config->Network);
 980         WriteServ(user->fd,"001 %s :Welcome to the %s IRC Network %s!%s@%s",user->nick,Config->Network,user->nick,user->ident,user->host);
 981         WriteServ(user->fd,"002 %s :Your host is %s, running version %s",user->nick,Config->ServerName,VERSION);
 982         WriteServ(user->fd,"003 %s :This server was created %s %s",user->nick,__TIME__,__DATE__);
 983         WriteServ(user->fd,"004 %s %s %s iowghrasxRVSCWBG lvhopsmntikrcaqbegIOLQRSKVHGCNT vhobeIaqglk",user->nick,Config->ServerName,VERSION);
 984
 985         // anfl @ #ratbox, efnet reminded me that according to the RFC this cant contain more than 13 tokens per line...
 986         // so i'd better split it :)
 987         std::stringstream out(Config->data005);
 988         std::string token = "";
 989         std::string line5 = "";
 990         int token_counter = 0;
 991
 992         while (!out.eof())
 993         {
 994                 out >> token;
 995                 line5 = line5 + token + " ";
 996                 token_counter++;
 997
 998                 if ((token_counter >= 13) || (out.eof() == true))
 999                 {
1000                         WriteServ(user->fd,"005 %s %s:are supported by this server",user->nick,line5.c_str());
1001                         line5 = "";
1002                         token_counter = 0;
1003                 }
1004         }
1005
1006         ShowMOTD(user);
1007
1008         /*
1009          * fix 3 by brain, move registered = 7 below these so that spurious modes and host
1010          * changes dont go out onto the network and produce 'fake direction'.
1011          */
1012         FOREACH_MOD(I_OnUserConnect,OnUserConnect(user));
1013         FOREACH_MOD(I_OnGlobalConnect,OnGlobalConnect(user));
1014         user->registered = REG_ALL;
1015         WriteOpers("*** Client connecting on port %lu: %s!%s@%s [%s]",(unsigned long)user->port,user->nick,user->ident,user->host,insp_ntoa(user->ip4));
1016 }
1017
1018 /** ReHashNick()
1019  * re-allocates a nick in the user_hash after they change nicknames,
1020  * returns a pointer to the new user as it may have moved
1021  */
1022 userrec* ReHashNick(const char* Old, const char* New)
1023 {
1024         //user_hash::iterator newnick;
1025         user_hash::iterator oldnick = clientlist.find(Old);
1026
1027         log(DEBUG,"ReHashNick: %s %s",Old,New);
1028
1029         if (!strcasecmp(Old,New))
1030         {
1031                 log(DEBUG,"old nick is new nick, skipping");
1032                 return oldnick->second;
1033         }
1034
1035         if (oldnick == clientlist.end())
1036                 return NULL; /* doesnt exist */
1037
1038         log(DEBUG,"ReHashNick: Found hashed nick %s",Old);
1039
1040         userrec* olduser = oldnick->second;
1041         clientlist[New] = olduser;
1042         clientlist.erase(oldnick);
1043
1044         log(DEBUG,"ReHashNick: Nick rehashed as %s",New);
1045
1046         return clientlist[New];
1047 }
1048
1049 void force_nickchange(userrec* user,const char* newnick)
1050 {
1051         char nick[MAXBUF];
1052         int MOD_RESULT = 0;
1053
1054         *nick = 0;
1055
1056         FOREACH_RESULT(I_OnUserPreNick,OnUserPreNick(user,newnick));
1057
1058         if (MOD_RESULT)
1059         {
1060                 ServerInstance->stats->statsCollisions++;
1061                 kill_link(user,"Nickname collision");
1062                 return;
1063         }
1064
1065         if (matches_qline(newnick))
1066         {
1067                 ServerInstance->stats->statsCollisions++;
1068                 kill_link(user,"Nickname collision");
1069                 return;
1070         }
1071
1072         if (user)
1073         {
1074                 if (newnick)
1075                 {
1076                         strlcpy(nick,newnick,MAXBUF-1);
1077                 }
1078
1079                 if (user->registered == REG_ALL)
1080                 {
1081                         const char* pars[1];
1082                         pars[0] = nick;
1083                         std::string cmd = "NICK";
1084
1085                         ServerInstance->Parser->CallHandler(cmd,pars,1,user);
1086                 }
1087         }
1088 }