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