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[65535];
  80
  81 time_t TIME = time(NULL), OLDTIME = time(NULL);
  82
  83 SocketEngine* SE = NULL;
  84
  85 // This table references users by file descriptor.
  86 // its an array to make it VERY fast, as all lookups are referenced
  87 // by an integer, meaning there is no need for a scan/search operation.
  88 userrec* fd_ref_table[65536];
  89
  90 Server* MyServer = new Server;
  91 ServerConfig *Config = new ServerConfig;
  92
  93 user_hash clientlist;
  94 chan_hash chanlist;
  95 whowas_hash whowas;
  96 servernamelist servernames;
  97 char lowermap[255];
  98
  99 void AddServerName(std::string servername)
 100 {
 101         log(DEBUG,"Adding server name: %s",servername.c_str());
 102         for (servernamelist::iterator a = servernames.begin(); a < servernames.end(); a++)
 103         {
 104                 if (*a == servername)
 105                         return;
 106         }
 107         servernames.push_back(servername);
 108 }
 109
 110 const char* FindServerNamePtr(std::string servername)
 111 {
 112         for (servernamelist::iterator a = servernames.begin(); a < servernames.end(); a++)
 113         {
 114                 if (*a == servername)
 115                         return a->c_str();
 116         }
 117         AddServerName(servername);
 118         return FindServerNamePtr(servername);
 119 }
 120
 121 std::string InspIRCd::GetRevision()
 122 {
 123         /* w00t got me to replace a bunch of strtok_r
 124          * with something nicer, so i did this. Its the
 125          * same thing really, only in C++. It places the
 126          * text into a std::stringstream which is a readable
 127          * and writeable buffer stream, and then pops two
 128          * words off it, space delimited. Because it reads
 129          * into the same variable twice, the first word
 130          * is discarded, and the second one returned.
 131          */
 132         std::stringstream Revision("$Revision$");
 133         std::string single;
 134         Revision >> single >> single;
 135         return single;
 136 }
 137
 138 void InspIRCd::MakeLowerMap()
 139 {
 140         // initialize the lowercase mapping table
 141         for (unsigned int cn = 0; cn < 256; cn++)
 142                 lowermap[cn] = cn;
 143         // lowercase the uppercase chars
 144         for (unsigned int cn = 65; cn < 91; cn++)
 145                 lowermap[cn] = tolower(cn);
 146         // now replace the specific chars for scandanavian comparison
 147         lowermap[(unsigned)'['] = '{';
 148         lowermap[(unsigned)']'] = '}';
 149         lowermap[(unsigned)'\\'] = '|';
 150 }
 151
 152 InspIRCd::InspIRCd(int argc, char** argv)
 153 {
 154         Start();
 155         module_sockets.clear();
 156         this->startup_time = time(NULL);
 157         srand(time(NULL));
 158         log(DEBUG,"*** InspIRCd starting up!");
 159         if (!FileExists(CONFIG_FILE))
 160         {
 161                 printf("ERROR: Cannot open config file: %s\nExiting...\n",CONFIG_FILE);
 162                 log(DEFAULT,"main: no config");
 163                 printf("ERROR: Your config file is missing, this IRCd will self destruct in 10 seconds!\n");
 164                 Exit(ERROR);
 165         }
 166         if (argc > 1) {
 167                 for (int i = 1; i < argc; i++)
 168                 {
 169                         if (!strcmp(argv[i],"-nofork")) {
 170                                 Config->nofork = true;
 171                         }
 172                         if (!strcmp(argv[i],"-wait")) {
 173                                 sleep(6);
 174                         }
 175                         if (!strcmp(argv[i],"-nolimit")) {
 176                                 Config->unlimitcore = true;
 177                         }
 178                 }
 179         }
 180
 181         strlcpy(Config->MyExecutable,argv[0],MAXBUF);
 182
 183         this->MakeLowerMap();
 184
 185         OpenLog(argv, argc);
 186         Config->ClearStack();
 187         Config->Read(true,NULL);
 188         CheckRoot();
 189         this->ModeGrok = new ModeParser();
 190         this->Parser = new CommandParser();
 191         this->stats = new serverstats();
 192         AddServerName(Config->ServerName);
 193         CheckDie();
 194         stats->BoundPortCount = BindPorts();
 195
 196         for(int t = 0; t < 255; t++)
 197                 Config->global_implementation[t] = 0;
 198
 199         memset(&Config->implement_lists,0,sizeof(Config->implement_lists));
 200
 201         printf("\n");
 202         if (!Config->nofork)
 203         {
 204                 if (DaemonSeed() == ERROR)
 205                 {
 206                         printf("ERROR: could not go into daemon mode. Shutting down.\n");
 207                         Exit(ERROR);
 208                 }
 209         }
 210
 211         /* Because of limitations in kqueue on freebsd, we must fork BEFORE we
 212          * initialize the socket engine.
 213          */
 214         SE = new SocketEngine();
 215
 216         /* We must load the modules AFTER initializing the socket engine, now */
 217
 218         return;
 219 }
 220
 221 std::string InspIRCd::GetVersionString()
 222 {
 223         char versiondata[MAXBUF];
 224 #ifdef THREADED_DNS
 225         char dnsengine[] = "multithread";
 226 #else
 227         char dnsengine[] = "singlethread";
 228 #endif
 229         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);
 230         return versiondata;
 231 }
 232
 233 char* InspIRCd::ModuleError()
 234 {
 235         return MODERR;
 236 }
 237
 238 void InspIRCd::erase_factory(int j)
 239 {
 240         int v = 0;
 241         for (std::vector<ircd_module*>::iterator t = factory.begin(); t != factory.end(); t++)
 242         {
 243                 if (v == j)
 244                 {
 245                         factory.erase(t);
 246                         factory.push_back(NULL);
 247                         return;
 248                 }
 249                 v++;
 250         }
 251 }
 252
 253 void InspIRCd::erase_module(int j)
 254 {
 255         int v1 = 0;
 256         for (std::vector<Module*>::iterator m = modules.begin(); m!= modules.end(); m++)
 257         {
 258                 if (v1 == j)
 259                 {
 260                         delete *m;
 261                         modules.erase(m);
 262                         modules.push_back(NULL);
 263                         break;
 264                 }
 265                 v1++;
 266         }
 267         int v2 = 0;
 268         for (std::vector<std::string>::iterator v = Config->module_names.begin(); v != Config->module_names.end(); v++)
 269         {
 270                 if (v2 == j)
 271                 {
 272                        Config->module_names.erase(v);
 273                        break;
 274                 }
 275                 v2++;
 276         }
 277
 278 }
 279
 280 bool InspIRCd::UnloadModule(const char* filename)
 281 {
 282         std::string filename_str = filename;
 283         for (unsigned int j = 0; j != Config->module_names.size(); j++)
 284         {
 285                 if (Config->module_names[j] == filename_str)
 286                 {
 287                         if (modules[j]->GetVersion().Flags & VF_STATIC)
 288                         {
 289                                 log(DEFAULT,"Failed to unload STATIC module %s",filename);
 290                                 snprintf(MODERR,MAXBUF,"Module not unloadable (marked static)");
 291                                 return false;
 292                         }
 293                         /* Give the module a chance to tidy out all its metadata */
 294                         for (chan_hash::iterator c = chanlist.begin(); c != chanlist.end(); c++)
 295                         {
 296                                 modules[j]->OnCleanup(TYPE_CHANNEL,c->second);
 297                         }
 298                         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 299                         {
 300                                 modules[j]->OnCleanup(TYPE_USER,u->second);
 301                         }
 302
 303                         for(int t = 0; t < 255; t++)
 304                         {
 305                                 Config->global_implementation[t] -= Config->implement_lists[j][t];
 306                         }
 307
 308                         FOREACH_MOD(I_OnUnloadModule,OnUnloadModule(modules[j],Config->module_names[j]));
 309                         // found the module
 310                         log(DEBUG,"Deleting module...");
 311                         erase_module(j);
 312                         log(DEBUG,"Erasing module entry...");
 313                         erase_factory(j);
 314                         log(DEBUG,"Removing dependent commands...");
 315                         Parser->RemoveCommands(filename);
 316                         log(DEFAULT,"Module %s unloaded",filename);
 317                         MODCOUNT--;
 318                         return true;
 319                 }
 320         }
 321         log(DEFAULT,"Module %s is not loaded, cannot unload it!",filename);
 322         snprintf(MODERR,MAXBUF,"Module not loaded");
 323         return false;
 324 }
 325
 326 bool InspIRCd::LoadModule(const char* filename)
 327 {
 328         char modfile[MAXBUF];
 329 #ifdef STATIC_LINK
 330         snprintf(modfile,MAXBUF,"%s",filename);
 331 #else
 332         snprintf(modfile,MAXBUF,"%s/%s",Config->ModPath,filename);
 333 #endif
 334         std::string filename_str = filename;
 335 #ifndef STATIC_LINK
 336         if (!DirValid(modfile))
 337         {
 338                 log(DEFAULT,"Module %s is not within the modules directory.",modfile);
 339                 snprintf(MODERR,MAXBUF,"Module %s is not within the modules directory.",modfile);
 340                 return false;
 341         }
 342 #endif
 343         log(DEBUG,"Loading module: %s",modfile);
 344 #ifndef STATIC_LINK
 345         if (FileExists(modfile))
 346         {
 347 #endif
 348                 for (unsigned int j = 0; j < Config->module_names.size(); j++)
 349                 {
 350                         if (Config->module_names[j] == filename_str)
 351                         {
 352                                 log(DEFAULT,"Module %s is already loaded, cannot load a module twice!",modfile);
 353                                 snprintf(MODERR,MAXBUF,"Module already loaded");
 354                                 return false;
 355                         }
 356                 }
 357                 ircd_module* a = new ircd_module(modfile);
 358                 factory[MODCOUNT+1] = a;
 359                 if (factory[MODCOUNT+1]->LastError())
 360                 {
 361                         log(DEFAULT,"Unable to load %s: %s",modfile,factory[MODCOUNT+1]->LastError());
 362                         snprintf(MODERR,MAXBUF,"Loader/Linker error: %s",factory[MODCOUNT+1]->LastError());
 363                         MODCOUNT--;
 364                         return false;
 365                 }
 366                 if (factory[MODCOUNT+1]->factory)
 367                 {
 368                         Module* m = factory[MODCOUNT+1]->factory->CreateModule(MyServer);
 369                         modules[MODCOUNT+1] = m;
 370                         /* save the module and the module's classfactory, if
 371                          * this isnt done, random crashes can occur :/ */
 372                         Config->module_names.push_back(filename);
 373
 374                         char* x = &Config->implement_lists[MODCOUNT+1][0];
 375                         for(int t = 0; t < 255; t++)
 376                                 x[t] = 0;
 377
 378                         modules[MODCOUNT+1]->Implements(x);
 379
 380                         for(int t = 0; t < 255; t++)
 381                         {
 382                                 Config->global_implementation[t] += Config->implement_lists[MODCOUNT+1][t];
 383                                 if (Config->implement_lists[MODCOUNT+1][t])
 384                                 {
 385                                         log(DEBUG,"Add global implementation: %d %d => %d",MODCOUNT+1,t,Config->global_implementation[t]);
 386                                 }
 387                         }
 388                 }
 389                 else
 390                 {
 391                         log(DEFAULT,"Unable to load %s",modfile);
 392                         snprintf(MODERR,MAXBUF,"Factory function failed!");
 393                         return false;
 394                 }
 395 #ifndef STATIC_LINK
 396         }
 397         else
 398         {
 399                 log(DEFAULT,"InspIRCd: startup: Module Not Found %s",modfile);
 400                 snprintf(MODERR,MAXBUF,"Module file could not be found");
 401                 return false;
 402         }
 403 #endif
 404         MODCOUNT++;
 405         FOREACH_MOD(I_OnLoadModule,OnLoadModule(modules[MODCOUNT],filename_str));
 406         return true;
 407 }
 408
 409 int InspIRCd::Run()
 410 {
 411         bool expire_run = false;
 412         std::vector<int> activefds;
 413         int incomingSockfd;
 414         int in_port;
 415         userrec* cu = NULL;
 416         InspSocket* s = NULL;
 417         InspSocket* s_del = NULL;
 418         char* target;
 419         unsigned int numberactive;
 420         sockaddr_in sock_us;     // our port number
 421         socklen_t uslen;         // length of our port number
 422
 423         /* Until THIS point, ServerInstance == NULL */
 424
 425         LoadAllModules(this);
 426
 427         printf("\nInspIRCd is now running!\n");
 428
 429         if (!Config->nofork)
 430         {
 431                 freopen("/dev/null","w",stdout);
 432                 freopen("/dev/null","w",stderr);
 433         }
 434
 435         /* Add the listening sockets used for client inbound connections
 436          * to the socket engine
 437          */
 438         for (int count = 0; count < stats->BoundPortCount; count++)
 439                 SE->AddFd(openSockfd[count],true,X_LISTEN);
 440
 441         WritePID(Config->PID);
 442
 443         /* main loop, this never returns */
 444         for (;;)
 445         {
 446                 /* time() seems to be a pretty expensive syscall, so avoid calling it too much.
 447                  * Once per loop iteration is pleanty.
 448                  */
 449                 OLDTIME = TIME;
 450                 TIME = time(NULL);
 451
 452                 /* Run background module timers every few seconds
 453                  * (the docs say modules shouldnt rely on accurate
 454                  * timing using this event, so we dont have to
 455                  * time this exactly).
 456                  */
 457                 if (((TIME % 8) == 0) && (!expire_run))
 458                 {
 459                         expire_lines();
 460                         FOREACH_MOD(I_OnBackgroundTimer,OnBackgroundTimer(TIME));
 461                         expire_run = true;
 462                         continue;
 463                 }
 464                 if ((TIME % 8) == 1)
 465                         expire_run = false;
 466
 467                 /* Once a second, do the background processing */
 468                 if (TIME != OLDTIME)
 469                         while (DoBackgroundUserStuff(TIME));
 470
 471                 /* Call the socket engine to wait on the active
 472                  * file descriptors. The socket engine has everything's
 473                  * descriptors in its list... dns, modules, users,
 474                  * servers... so its nice and easy, just one call.
 475                  */
 476                 SE->Wait(activefds);
 477
 478                 /**
 479                  * Now process each of the fd's. For users, we have a fast
 480                  * lookup table which can find a user by file descriptor, so
 481                  * processing them by fd isnt expensive. If we have a lot of
 482                  * listening ports or module sockets though, things could get
 483                  * ugly.
 484                  */
 485                 numberactive = activefds.size();
 486                 for (unsigned int activefd = 0; activefd < numberactive; activefd++)
 487                 {
 488                         int socket_type = SE->GetType(activefds[activefd]);
 489                         switch (socket_type)
 490                         {
 491                                 case X_ESTAB_CLIENT:
 492
 493                                         cu = fd_ref_table[activefds[activefd]];
 494                                         if (cu)
 495                                                 ProcessUser(cu);
 496
 497                                 break;
 498
 499                                 case X_ESTAB_MODULE:
 500
 501                                         /* Process module-owned sockets.
 502                                          * Modules are encouraged to inherit their sockets from
 503                                          * InspSocket so we can process them neatly like this.
 504                                          */
 505                                         s = socket_ref[activefds[activefd]];
 506
 507                                         if ((s) && (!s->Poll()))
 508                                         {
 509                                                 log(DEBUG,"Socket poll returned false, close and bail");
 510                                                 SE->DelFd(s->GetFd());
 511                                                 for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 512                                                 {
 513                                                         s_del = (InspSocket*)*a;
 514                                                         if ((s_del) && (s_del->GetFd() == activefds[activefd]))
 515                                                         {
 516                                                                 module_sockets.erase(a);
 517                                                                 break;
 518                                                         }
 519                                                 }
 520                                                 s->Close();
 521                                                 delete s;
 522                                         }
 523
 524                                 break;
 525
 526                                 case X_ESTAB_DNS:
 527
 528                                         /* When we are using single-threaded dns,
 529                                          * the sockets for dns end up in our mainloop.
 530                                          * When we are using multi-threaded dns,
 531                                          * each thread has its own basic poll() loop
 532                                          * within it, making them 'fire and forget'
 533                                          * and independent of the mainloop.
 534                                          */
 535 #ifndef THREADED_DNS
 536                                         dns_poll(activefds[activefd]);
 537 #endif
 538                                 break;
 539
 540                                 case X_LISTEN:
 541
 542                                         /* It's a listener */
 543                                         uslen = sizeof(sock_us);
 544                                         length = sizeof(client);
 545                                         incomingSockfd = accept (activefds[activefd],(struct sockaddr*)&client,&length);
 546                                         if (!getsockname(incomingSockfd,(sockaddr*)&sock_us,&uslen))
 547                                         {
 548                                                 in_port = ntohs(sock_us.sin_port);
 549                                                 log(DEBUG,"Accepted socket %d",incomingSockfd);
 550                                                 target = (char*)inet_ntoa(client.sin_addr);
 551                                                 /* Years and years ago, we used to resolve here
 552                                                  * using gethostbyaddr(). That is sucky and we
 553                                                  * don't do that any more...
 554                                                  */
 555                                                 if (incomingSockfd >= 0)
 556                                                 {
 557                                                         NonBlocking(incomingSockfd);
 558                                                         if (Config->GetIOHook(in_port))
 559                                                         {
 560                                                                 Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, target, in_port);
 561                                                         }
 562                                                         stats->statsAccept++;
 563                                                         AddClient(incomingSockfd, target, in_port, false, target);
 564                                                         log(DEBUG,"Adding client on port %lu fd=%lu",(unsigned long)in_port,(unsigned long)incomingSockfd);
 565                                                 }
 566                                                 else
 567                                                 {
 568                                                         WriteOpers("*** WARNING: accept() failed on port %lu (%s)",(unsigned long)in_port,target);
 569                                                         log(DEBUG,"accept failed: %lu",(unsigned long)in_port);
 570                                                         stats->statsRefused++;
 571                                                 }
 572                                         }
 573                                         else
 574                                         {
 575                                                 log(DEBUG,"Couldnt look up the port number for fd %lu (OS BROKEN?!)",incomingSockfd);
 576                                                 shutdown(incomingSockfd,2);
 577                                                 close(incomingSockfd);
 578                                         }
 579                                 break;
 580
 581                                 default:
 582                                         /* Something went wrong if we're in here.
 583                                          * In fact, so wrong, im not quite sure
 584                                          * what we would do, so for now, its going
 585                                          * to safely do bugger all.
 586                                          */
 587                                 break;
 588                         }
 589                 }
 590
 591         }
 592         /* This is never reached -- we hope! */
 593         return 0;
 594 }
 595
 596 /**********************************************************************************/
 597
 598 /**
 599  * An ircd in four lines! bwahahaha. ahahahahaha. ahahah *cough*.
 600  */
 601
 602 int main(int argc, char** argv)
 603 {
 604         ServerInstance = new InspIRCd(argc, argv);
 605         ServerInstance->Run();
 606         delete ServerInstance;
 607         return 0;
 608 }
 609