src/inspircd.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  Inspire is copyright (C) 2002-2005 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 /* Now with added unF! ;) */
  18
  19 using namespace std;
  20
  21 #include "inspircd_config.h"
  22 #include "inspircd.h"
  23 #include "inspircd_io.h"
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <sys/errno.h>
  27 #include <sys/ioctl.h>
  28 #include <sys/utsname.h>
  29 #include <time.h>
  30 #include <string>
  31 #ifdef GCC3
  32 #include <ext/hash_map>
  33 #else
  34 #include <hash_map>
  35 #endif
  36 #include <map>
  37 #include <sstream>
  38 #include <vector>
  39 #include <deque>
  40 #ifdef THREADED_DNS
  41 #include <pthread.h>
  42 #endif
  43 #include "users.h"
  44 #include "ctables.h"
  45 #include "globals.h"
  46 #include "modules.h"
  47 #include "dynamic.h"
  48 #include "wildcard.h"
  49 #include "message.h"
  50 #include "mode.h"
  51 #include "commands.h"
  52 #include "xline.h"
  53 #include "inspstring.h"
  54 #include "dnsqueue.h"
  55 #include "helperfuncs.h"
  56 #include "hashcomp.h"
  57 #include "socketengine.h"
  58 #include "userprocess.h"
  59 #include "socket.h"
  60 #include "typedefs.h"
  61 #include "command_parse.h"
  62
  63 InspIRCd* ServerInstance;
  64
  65 int WHOWAS_STALE = 48; // default WHOWAS Entries last 2 days before they go 'stale'
  66 int WHOWAS_MAX = 100;  // default 100 people maximum in the WHOWAS list
  67
  68 extern std::vector<Module*> modules;
  69 extern std::vector<ircd_module*> factory;
  70
  71 std::vector<InspSocket*> module_sockets;
  72 std::vector<userrec*> local_users;
  73
  74 extern int MODCOUNT;
  75 int openSockfd[MAXSOCKS];
  76 sockaddr_in client,server;
  77 socklen_t length;
  78
  79 extern InspSocket* socket_ref[MAX_DESCRIPTORS];
  80
  81 time_t TIME = time(NULL), OLDTIME = time(NULL);
  82
  83 // This table references users by file descriptor.
  84 // its an array to make it VERY fast, as all lookups are referenced
  85 // by an integer, meaning there is no need for a scan/search operation.
  86 userrec* fd_ref_table[65536];
  87
  88 Server* MyServer = new Server;
  89 ServerConfig *Config = new ServerConfig;
  90
  91 user_hash clientlist;
  92 chan_hash chanlist;
  93 whowas_hash whowas;
  94 servernamelist servernames;
  95 char lowermap[255];
  96
  97 void AddServerName(std::string servername)
  98 {
  99         log(DEBUG,"Adding server name: %s",servername.c_str());
 100         for (servernamelist::iterator a = servernames.begin(); a < servernames.end(); a++)
 101         {
 102                 if (*a == servername)
 103                         return;
 104         }
 105         servernames.push_back(servername);
 106 }
 107
 108 const char* FindServerNamePtr(std::string servername)
 109 {
 110         for (servernamelist::iterator a = servernames.begin(); a < servernames.end(); a++)
 111         {
 112                 if (*a == servername)
 113                         return a->c_str();
 114         }
 115         AddServerName(servername);
 116         return FindServerNamePtr(servername);
 117 }
 118
 119 std::string InspIRCd::GetRevision()
 120 {
 121         /* w00t got me to replace a bunch of strtok_r
 122          * with something nicer, so i did this. Its the
 123          * same thing really, only in C++. It places the
 124          * text into a std::stringstream which is a readable
 125          * and writeable buffer stream, and then pops two
 126          * words off it, space delimited. Because it reads
 127          * into the same variable twice, the first word
 128          * is discarded, and the second one returned.
 129          */
 130         std::stringstream Revision("$Revision$");
 131         std::string single;
 132         Revision >> single >> single;
 133         return single;
 134 }
 135
 136 void InspIRCd::MakeLowerMap()
 137 {
 138         // initialize the lowercase mapping table
 139         for (unsigned int cn = 0; cn < 256; cn++)
 140                 lowermap[cn] = cn;
 141         // lowercase the uppercase chars
 142         for (unsigned int cn = 65; cn < 91; cn++)
 143                 lowermap[cn] = tolower(cn);
 144         // now replace the specific chars for scandanavian comparison
 145         lowermap[(unsigned)'['] = '{';
 146         lowermap[(unsigned)']'] = '}';
 147         lowermap[(unsigned)'\\'] = '|';
 148 }
 149
 150 InspIRCd::InspIRCd(int argc, char** argv)
 151 {
 152         Start();
 153         module_sockets.clear();
 154         this->startup_time = time(NULL);
 155         srand(time(NULL));
 156         log(DEBUG,"*** InspIRCd starting up!");
 157         if (!FileExists(CONFIG_FILE))
 158         {
 159                 printf("ERROR: Cannot open config file: %s\nExiting...\n",CONFIG_FILE);
 160                 log(DEFAULT,"main: no config");
 161                 printf("ERROR: Your config file is missing, this IRCd will self destruct in 10 seconds!\n");
 162                 Exit(ERROR);
 163         }
 164         if (argc > 1) {
 165                 for (int i = 1; i < argc; i++)
 166                 {
 167                         if (!strcmp(argv[i],"-nofork")) {
 168                                 Config->nofork = true;
 169                         }
 170                         if (!strcmp(argv[i],"-wait")) {
 171                                 sleep(6);
 172                         }
 173                         if (!strcmp(argv[i],"-nolimit")) {
 174                                 Config->unlimitcore = true;
 175                         }
 176                 }
 177         }
 178
 179         strlcpy(Config->MyExecutable,argv[0],MAXBUF);
 180
 181         this->MakeLowerMap();
 182
 183         OpenLog(argv, argc);
 184         Config->ClearStack();
 185         Config->Read(true,NULL);
 186         CheckRoot();
 187         this->ModeGrok = new ModeParser();
 188         this->Parser = new CommandParser();
 189         this->stats = new serverstats();
 190         AddServerName(Config->ServerName);
 191         CheckDie();
 192         stats->BoundPortCount = BindPorts();
 193
 194         for(int t = 0; t < 255; t++)
 195                 Config->global_implementation[t] = 0;
 196
 197         memset(&Config->implement_lists,0,sizeof(Config->implement_lists));
 198
 199         printf("\n");
 200         SetSignals();
 201         if (!Config->nofork)
 202         {
 203                 if (DaemonSeed() == ERROR)
 204                 {
 205                         printf("ERROR: could not go into daemon mode. Shutting down.\n");
 206                         Exit(ERROR);
 207                 }
 208         }
 209
 210         /* Because of limitations in kqueue on freebsd, we must fork BEFORE we
 211          * initialize the socket engine.
 212          */
 213         SE = new SocketEngine();
 214
 215         /* We must load the modules AFTER initializing the socket engine, now */
 216
 217         return;
 218 }
 219
 220 std::string InspIRCd::GetVersionString()
 221 {
 222         char versiondata[MAXBUF];
 223 #ifdef THREADED_DNS
 224         char dnsengine[] = "multithread";
 225 #else
 226         char dnsengine[] = "singlethread";
 227 #endif
 228         snprintf(versiondata,MAXBUF,"%s Rev. %s %s :%s [FLAGS=%lu,%s,%s]",VERSION,GetRevision().c_str(),Config->ServerName,SYSTEM,(unsigned long)OPTIMISATION,SE->GetName().c_str(),dnsengine);
 229         return versiondata;
 230 }
 231
 232 char* InspIRCd::ModuleError()
 233 {
 234         return MODERR;
 235 }
 236
 237 void InspIRCd::erase_factory(int j)
 238 {
 239         int v = 0;
 240         for (std::vector<ircd_module*>::iterator t = factory.begin(); t != factory.end(); t++)
 241         {
 242                 if (v == j)
 243                 {
 244                         factory.erase(t);
 245                         factory.push_back(NULL);
 246                         return;
 247                 }
 248                 v++;
 249         }
 250 }
 251
 252 void InspIRCd::erase_module(int j)
 253 {
 254         int v1 = 0;
 255         for (std::vector<Module*>::iterator m = modules.begin(); m!= modules.end(); m++)
 256         {
 257                 if (v1 == j)
 258                 {
 259                         delete *m;
 260                         modules.erase(m);
 261                         modules.push_back(NULL);
 262                         break;
 263                 }
 264                 v1++;
 265         }
 266         int v2 = 0;
 267         for (std::vector<std::string>::iterator v = Config->module_names.begin(); v != Config->module_names.end(); v++)
 268         {
 269                 if (v2 == j)
 270                 {
 271                        Config->module_names.erase(v);
 272                        break;
 273                 }
 274                 v2++;
 275         }
 276
 277 }
 278
 279 void InspIRCd::BuildISupport()
 280 {
 281         // the neatest way to construct the initial 005 numeric, considering the number of configure constants to go in it...
 282         std::stringstream v;
 283         v << "WALLCHOPS MODES=13 CHANTYPES=# PREFIX=(ohv)@%+ MAP SAFELIST MAXCHANNELS=" << MAXCHANS << " MAXBANS=60 NICKLEN=" << NICKMAX;
 284         v << " CASEMAPPING=rfc1459 STATUSMSG=@+ CHARSET=ascii TOPICLEN=" << MAXTOPIC << " KICKLEN=" << MAXKICK << " MAXTARGETS=20 AWAYLEN=";
 285         v << MAXAWAY << " CHANMODES=ohvb,k,l,psmnti NETWORK=" << Config->Network;
 286         Config->data005 = v.str();
 287         FOREACH_MOD(I_On005Numeric,On005Numeric(Config->data005));
 288 }
 289
 290 bool InspIRCd::UnloadModule(const char* filename)
 291 {
 292         std::string filename_str = filename;
 293         for (unsigned int j = 0; j != Config->module_names.size(); j++)
 294         {
 295                 if (Config->module_names[j] == filename_str)
 296                 {
 297                         if (modules[j]->GetVersion().Flags & VF_STATIC)
 298                         {
 299                                 log(DEFAULT,"Failed to unload STATIC module %s",filename);
 300                                 snprintf(MODERR,MAXBUF,"Module not unloadable (marked static)");
 301                                 return false;
 302                         }
 303                         /* Give the module a chance to tidy out all its metadata */
 304                         for (chan_hash::iterator c = chanlist.begin(); c != chanlist.end(); c++)
 305                         {
 306                                 modules[j]->OnCleanup(TYPE_CHANNEL,c->second);
 307                         }
 308                         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 309                         {
 310                                 modules[j]->OnCleanup(TYPE_USER,u->second);
 311                         }
 312
 313                         for(int t = 0; t < 255; t++)
 314                         {
 315                                 Config->global_implementation[t] -= Config->implement_lists[j][t];
 316                         }
 317
 318                         /* We have to renumber implement_lists after unload because the module numbers change!
 319                          */
 320                         for(int j2 = j; j2 < 254; j2++)
 321                         {
 322                                 for(int t = 0; t < 255; t++)
 323                                 {
 324                                         Config->implement_lists[j2][t] = Config->implement_lists[j2+1][t];
 325                                 }
 326                         }
 327
 328                         FOREACH_MOD(I_OnUnloadModule,OnUnloadModule(modules[j],Config->module_names[j]));
 329                         // found the module
 330                         log(DEBUG,"Deleting module...");
 331                         erase_module(j);
 332                         log(DEBUG,"Erasing module entry...");
 333                         erase_factory(j);
 334                         log(DEBUG,"Removing dependent commands...");
 335                         Parser->RemoveCommands(filename);
 336                         log(DEFAULT,"Module %s unloaded",filename);
 337                         MODCOUNT--;
 338                         BuildISupport();
 339                         return true;
 340                 }
 341         }
 342         log(DEFAULT,"Module %s is not loaded, cannot unload it!",filename);
 343         snprintf(MODERR,MAXBUF,"Module not loaded");
 344         return false;
 345 }
 346
 347 bool InspIRCd::LoadModule(const char* filename)
 348 {
 349         char modfile[MAXBUF];
 350 #ifdef STATIC_LINK
 351         strlcpy(modfile,filename,MAXBUF);
 352 #else
 353         snprintf(modfile,MAXBUF,"%s/%s",Config->ModPath,filename);
 354 #endif
 355         std::string filename_str = filename;
 356 #ifndef STATIC_LINK
 357         if (!DirValid(modfile))
 358         {
 359                 log(DEFAULT,"Module %s is not within the modules directory.",modfile);
 360                 snprintf(MODERR,MAXBUF,"Module %s is not within the modules directory.",modfile);
 361                 return false;
 362         }
 363 #endif
 364         log(DEBUG,"Loading module: %s",modfile);
 365 #ifndef STATIC_LINK
 366         if (FileExists(modfile))
 367         {
 368 #endif
 369                 for (unsigned int j = 0; j < Config->module_names.size(); j++)
 370                 {
 371                         if (Config->module_names[j] == filename_str)
 372                         {
 373                                 log(DEFAULT,"Module %s is already loaded, cannot load a module twice!",modfile);
 374                                 snprintf(MODERR,MAXBUF,"Module already loaded");
 375                                 return false;
 376                         }
 377                 }
 378                 ircd_module* a = new ircd_module(modfile);
 379                 factory[MODCOUNT+1] = a;
 380                 if (factory[MODCOUNT+1]->LastError())
 381                 {
 382                         log(DEFAULT,"Unable to load %s: %s",modfile,factory[MODCOUNT+1]->LastError());
 383                         snprintf(MODERR,MAXBUF,"Loader/Linker error: %s",factory[MODCOUNT+1]->LastError());
 384                         MODCOUNT--;
 385                         return false;
 386                 }
 387                 if (factory[MODCOUNT+1]->factory)
 388                 {
 389                         Module* m = factory[MODCOUNT+1]->factory->CreateModule(MyServer);
 390                         modules[MODCOUNT+1] = m;
 391                         /* save the module and the module's classfactory, if
 392                          * this isnt done, random crashes can occur :/ */
 393                         Config->module_names.push_back(filename);
 394
 395                         char* x = &Config->implement_lists[MODCOUNT+1][0];
 396                         for(int t = 0; t < 255; t++)
 397                                 x[t] = 0;
 398
 399                         modules[MODCOUNT+1]->Implements(x);
 400
 401                         for(int t = 0; t < 255; t++)
 402                         {
 403                                 Config->global_implementation[t] += Config->implement_lists[MODCOUNT+1][t];
 404                                 if (Config->implement_lists[MODCOUNT+1][t])
 405                                 {
 406                                         log(DEBUG,"Add global implementation: %d %d => %d",MODCOUNT+1,t,Config->global_implementation[t]);
 407                                 }
 408                         }
 409                 }
 410                 else
 411                 {
 412                         log(DEFAULT,"Unable to load %s",modfile);
 413                         snprintf(MODERR,MAXBUF,"Factory function failed!");
 414                         return false;
 415                 }
 416 #ifndef STATIC_LINK
 417         }
 418         else
 419         {
 420                 log(DEFAULT,"InspIRCd: startup: Module Not Found %s",modfile);
 421                 snprintf(MODERR,MAXBUF,"Module file could not be found");
 422                 return false;
 423         }
 424 #endif
 425         MODCOUNT++;
 426         FOREACH_MOD(I_OnLoadModule,OnLoadModule(modules[MODCOUNT],filename_str));
 427         BuildISupport();
 428         return true;
 429 }
 430
 431 int InspIRCd::Run()
 432 {
 433         bool expire_run = false;
 434         int activefds[MAX_DESCRIPTORS];
 435         int incomingSockfd;
 436         int in_port;
 437         userrec* cu = NULL;
 438         InspSocket* s = NULL;
 439         InspSocket* s_del = NULL;
 440         char* target;
 441         unsigned int numberactive;
 442         sockaddr_in sock_us;     // our port number
 443         socklen_t uslen;         // length of our port number
 444
 445         /* Until THIS point, ServerInstance == NULL */
 446
 447         LoadAllModules(this);
 448
 449         printf("\nInspIRCd is now running!\n");
 450
 451         if (!Config->nofork)
 452         {
 453                 freopen("/dev/null","w",stdout);
 454                 freopen("/dev/null","w",stderr);
 455         }
 456
 457         /* Add the listening sockets used for client inbound connections
 458          * to the socket engine
 459          */
 460         for (int count = 0; count < stats->BoundPortCount; count++)
 461                 SE->AddFd(openSockfd[count],true,X_LISTEN);
 462
 463         WritePID(Config->PID);
 464
 465         /* main loop, this never returns */
 466         for (;;)
 467         {
 468                 /* time() seems to be a pretty expensive syscall, so avoid calling it too much.
 469                  * Once per loop iteration is pleanty.
 470                  */
 471                 OLDTIME = TIME;
 472                 TIME = time(NULL);
 473
 474                 /* Run background module timers every few seconds
 475                  * (the docs say modules shouldnt rely on accurate
 476                  * timing using this event, so we dont have to
 477                  * time this exactly).
 478                  */
 479                 if (((TIME % 8) == 0) && (!expire_run))
 480                 {
 481                         expire_lines();
 482                         FOREACH_MOD(I_OnBackgroundTimer,OnBackgroundTimer(TIME));
 483                         expire_run = true;
 484                         continue;
 485                 }
 486                 else if ((TIME % 8) == 1)
 487                 {
 488                         expire_run = false;
 489                 }
 490
 491                 /* Once a second, do the background processing */
 492                 if (TIME != OLDTIME)
 493                         DoBackgroundUserStuff(TIME);
 494
 495                 /* Call the socket engine to wait on the active
 496                  * file descriptors. The socket engine has everything's
 497                  * descriptors in its list... dns, modules, users,
 498                  * servers... so its nice and easy, just one call.
 499                  */
 500                 if (!(numberactive = SE->Wait(activefds)))
 501                         continue;
 502
 503                 /**
 504                  * Now process each of the fd's. For users, we have a fast
 505                  * lookup table which can find a user by file descriptor, so
 506                  * processing them by fd isnt expensive. If we have a lot of
 507                  * listening ports or module sockets though, things could get
 508                  * ugly.
 509                  */
 510                 for (unsigned int activefd = 0; activefd < numberactive; activefd++)
 511                 {
 512                         int socket_type = SE->GetType(activefds[activefd]);
 513                         switch (socket_type)
 514                         {
 515                                 case X_ESTAB_CLIENT:
 516
 517                                         cu = fd_ref_table[activefds[activefd]];
 518                                         if (cu)
 519                                                 ProcessUser(cu);
 520
 521                                 break;
 522
 523                                 case X_ESTAB_MODULE:
 524
 525                                         /* Process module-owned sockets.
 526                                          * Modules are encouraged to inherit their sockets from
 527                                          * InspSocket so we can process them neatly like this.
 528                                          */
 529                                         s = socket_ref[activefds[activefd]];
 530
 531                                         if ((s) && (!s->Poll()))
 532                                         {
 533                                                 log(DEBUG,"Socket poll returned false, close and bail");
 534                                                 SE->DelFd(s->GetFd());
 535                                                 for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 536                                                 {
 537                                                         s_del = (InspSocket*)*a;
 538                                                         if ((s_del) && (s_del->GetFd() == activefds[activefd]))
 539                                                         {
 540                                                                 module_sockets.erase(a);
 541                                                                 break;
 542                                                         }
 543                                                 }
 544                                                 s->Close();
 545                                                 delete s;
 546                                         }
 547
 548                                 break;
 549
 550                                 case X_ESTAB_DNS:
 551
 552                                         /* When we are using single-threaded dns,
 553                                          * the sockets for dns end up in our mainloop.
 554                                          * When we are using multi-threaded dns,
 555                                          * each thread has its own basic poll() loop
 556                                          * within it, making them 'fire and forget'
 557                                          * and independent of the mainloop.
 558                                          */
 559 #ifndef THREADED_DNS
 560                                         dns_poll(activefds[activefd]);
 561 #endif
 562                                 break;
 563
 564                                 case X_LISTEN:
 565
 566                                         /* It's a listener */
 567                                         uslen = sizeof(sock_us);
 568                                         length = sizeof(client);
 569                                         incomingSockfd = accept (activefds[activefd],(struct sockaddr*)&client,&length);
 570                                         if (!getsockname(incomingSockfd,(sockaddr*)&sock_us,&uslen))
 571                                         {
 572                                                 in_port = ntohs(sock_us.sin_port);
 573                                                 log(DEBUG,"Accepted socket %d",incomingSockfd);
 574                                                 target = (char*)inet_ntoa(client.sin_addr);
 575                                                 /* Years and years ago, we used to resolve here
 576                                                  * using gethostbyaddr(). That is sucky and we
 577                                                  * don't do that any more...
 578                                                  */
 579                                                 if (incomingSockfd >= 0)
 580                                                 {
 581                                                         NonBlocking(incomingSockfd);
 582                                                         if (Config->GetIOHook(in_port))
 583                                                         {
 584                                                                 Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, target, in_port);
 585                                                         }
 586                                                         stats->statsAccept++;
 587                                                         AddClient(incomingSockfd, target, in_port, false, target);
 588                                                         log(DEBUG,"Adding client on port %lu fd=%lu",(unsigned long)in_port,(unsigned long)incomingSockfd);
 589                                                 }
 590                                                 else
 591                                                 {
 592                                                         WriteOpers("*** WARNING: accept() failed on port %lu (%s)",(unsigned long)in_port,target);
 593                                                         log(DEBUG,"accept failed: %lu",(unsigned long)in_port);
 594                                                         stats->statsRefused++;
 595                                                 }
 596                                         }
 597                                         else
 598                                         {
 599                                                 log(DEBUG,"Couldnt look up the port number for fd %lu (OS BROKEN?!)",incomingSockfd);
 600                                                 shutdown(incomingSockfd,2);
 601                                                 close(incomingSockfd);
 602                                         }
 603                                 break;
 604
 605                                 default:
 606                                         /* Something went wrong if we're in here.
 607                                          * In fact, so wrong, im not quite sure
 608                                          * what we would do, so for now, its going
 609                                          * to safely do bugger all.
 610                                          */
 611                                 break;
 612                         }
 613                 }
 614
 615         }
 616         /* This is never reached -- we hope! */
 617         return 0;
 618 }
 619
 620 /**********************************************************************************/
 621
 622 /**
 623  * An ircd in four lines! bwahahaha. ahahahahaha. ahahah *cough*.
 624  */
 625
 626 int main(int argc, char** argv)
 627 {
 628         ServerInstance = new InspIRCd(argc, argv);
 629         ServerInstance->Run();
 630         delete ServerInstance;
 631         return 0;
 632 }
 633