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         SetSignals();
 203         if (!Config->nofork)
 204         {
 205                 if (DaemonSeed() == ERROR)
 206                 {
 207                         printf("ERROR: could not go into daemon mode. Shutting down.\n");
 208                         Exit(ERROR);
 209                 }
 210         }
 211
 212         /* Because of limitations in kqueue on freebsd, we must fork BEFORE we
 213          * initialize the socket engine.
 214          */
 215         SE = new SocketEngine();
 216
 217         /* We must load the modules AFTER initializing the socket engine, now */
 218
 219         return;
 220 }
 221
 222 std::string InspIRCd::GetVersionString()
 223 {
 224         char versiondata[MAXBUF];
 225 #ifdef THREADED_DNS
 226         char dnsengine[] = "multithread";
 227 #else
 228         char dnsengine[] = "singlethread";
 229 #endif
 230         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);
 231         return versiondata;
 232 }
 233
 234 char* InspIRCd::ModuleError()
 235 {
 236         return MODERR;
 237 }
 238
 239 void InspIRCd::erase_factory(int j)
 240 {
 241         int v = 0;
 242         for (std::vector<ircd_module*>::iterator t = factory.begin(); t != factory.end(); t++)
 243         {
 244                 if (v == j)
 245                 {
 246                         factory.erase(t);
 247                         factory.push_back(NULL);
 248                         return;
 249                 }
 250                 v++;
 251         }
 252 }
 253
 254 void InspIRCd::erase_module(int j)
 255 {
 256         int v1 = 0;
 257         for (std::vector<Module*>::iterator m = modules.begin(); m!= modules.end(); m++)
 258         {
 259                 if (v1 == j)
 260                 {
 261                         delete *m;
 262                         modules.erase(m);
 263                         modules.push_back(NULL);
 264                         break;
 265                 }
 266                 v1++;
 267         }
 268         int v2 = 0;
 269         for (std::vector<std::string>::iterator v = Config->module_names.begin(); v != Config->module_names.end(); v++)
 270         {
 271                 if (v2 == j)
 272                 {
 273                        Config->module_names.erase(v);
 274                        break;
 275                 }
 276                 v2++;
 277         }
 278
 279 }
 280
 281 bool InspIRCd::UnloadModule(const char* filename)
 282 {
 283         std::string filename_str = filename;
 284         for (unsigned int j = 0; j != Config->module_names.size(); j++)
 285         {
 286                 if (Config->module_names[j] == filename_str)
 287                 {
 288                         if (modules[j]->GetVersion().Flags & VF_STATIC)
 289                         {
 290                                 log(DEFAULT,"Failed to unload STATIC module %s",filename);
 291                                 snprintf(MODERR,MAXBUF,"Module not unloadable (marked static)");
 292                                 return false;
 293                         }
 294                         /* Give the module a chance to tidy out all its metadata */
 295                         for (chan_hash::iterator c = chanlist.begin(); c != chanlist.end(); c++)
 296                         {
 297                                 modules[j]->OnCleanup(TYPE_CHANNEL,c->second);
 298                         }
 299                         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 300                         {
 301                                 modules[j]->OnCleanup(TYPE_USER,u->second);
 302                         }
 303
 304                         for(int t = 0; t < 255; t++)
 305                         {
 306                                 Config->global_implementation[t] -= Config->implement_lists[j][t];
 307                         }
 308
 309                         FOREACH_MOD(I_OnUnloadModule,OnUnloadModule(modules[j],Config->module_names[j]));
 310                         // found the module
 311                         log(DEBUG,"Deleting module...");
 312                         erase_module(j);
 313                         log(DEBUG,"Erasing module entry...");
 314                         erase_factory(j);
 315                         log(DEBUG,"Removing dependent commands...");
 316                         Parser->RemoveCommands(filename);
 317                         log(DEFAULT,"Module %s unloaded",filename);
 318                         MODCOUNT--;
 319                         return true;
 320                 }
 321         }
 322         log(DEFAULT,"Module %s is not loaded, cannot unload it!",filename);
 323         snprintf(MODERR,MAXBUF,"Module not loaded");
 324         return false;
 325 }
 326
 327 bool InspIRCd::LoadModule(const char* filename)
 328 {
 329         char modfile[MAXBUF];
 330 #ifdef STATIC_LINK
 331         snprintf(modfile,MAXBUF,"%s",filename);
 332 #else
 333         snprintf(modfile,MAXBUF,"%s/%s",Config->ModPath,filename);
 334 #endif
 335         std::string filename_str = filename;
 336 #ifndef STATIC_LINK
 337         if (!DirValid(modfile))
 338         {
 339                 log(DEFAULT,"Module %s is not within the modules directory.",modfile);
 340                 snprintf(MODERR,MAXBUF,"Module %s is not within the modules directory.",modfile);
 341                 return false;
 342         }
 343 #endif
 344         log(DEBUG,"Loading module: %s",modfile);
 345 #ifndef STATIC_LINK
 346         if (FileExists(modfile))
 347         {
 348 #endif
 349                 for (unsigned int j = 0; j < Config->module_names.size(); j++)
 350                 {
 351                         if (Config->module_names[j] == filename_str)
 352                         {
 353                                 log(DEFAULT,"Module %s is already loaded, cannot load a module twice!",modfile);
 354                                 snprintf(MODERR,MAXBUF,"Module already loaded");
 355                                 return false;
 356                         }
 357                 }
 358                 ircd_module* a = new ircd_module(modfile);
 359                 factory[MODCOUNT+1] = a;
 360                 if (factory[MODCOUNT+1]->LastError())
 361                 {
 362                         log(DEFAULT,"Unable to load %s: %s",modfile,factory[MODCOUNT+1]->LastError());
 363                         snprintf(MODERR,MAXBUF,"Loader/Linker error: %s",factory[MODCOUNT+1]->LastError());
 364                         MODCOUNT--;
 365                         return false;
 366                 }
 367                 if (factory[MODCOUNT+1]->factory)
 368                 {
 369                         Module* m = factory[MODCOUNT+1]->factory->CreateModule(MyServer);
 370                         modules[MODCOUNT+1] = m;
 371                         /* save the module and the module's classfactory, if
 372                          * this isnt done, random crashes can occur :/ */
 373                         Config->module_names.push_back(filename);
 374
 375                         char* x = &Config->implement_lists[MODCOUNT+1][0];
 376                         for(int t = 0; t < 255; t++)
 377                                 x[t] = 0;
 378
 379                         modules[MODCOUNT+1]->Implements(x);
 380
 381                         for(int t = 0; t < 255; t++)
 382                         {
 383                                 Config->global_implementation[t] += Config->implement_lists[MODCOUNT+1][t];
 384                                 if (Config->implement_lists[MODCOUNT+1][t])
 385                                 {
 386                                         log(DEBUG,"Add global implementation: %d %d => %d",MODCOUNT+1,t,Config->global_implementation[t]);
 387                                 }
 388                         }
 389                 }
 390                 else
 391                 {
 392                         log(DEFAULT,"Unable to load %s",modfile);
 393                         snprintf(MODERR,MAXBUF,"Factory function failed!");
 394                         return false;
 395                 }
 396 #ifndef STATIC_LINK
 397         }
 398         else
 399         {
 400                 log(DEFAULT,"InspIRCd: startup: Module Not Found %s",modfile);
 401                 snprintf(MODERR,MAXBUF,"Module file could not be found");
 402                 return false;
 403         }
 404 #endif
 405         MODCOUNT++;
 406         FOREACH_MOD(I_OnLoadModule,OnLoadModule(modules[MODCOUNT],filename_str));
 407         return true;
 408 }
 409
 410 int InspIRCd::Run()
 411 {
 412         bool expire_run = false;
 413         std::vector<int> activefds;
 414         int incomingSockfd;
 415         int in_port;
 416         userrec* cu = NULL;
 417         InspSocket* s = NULL;
 418         InspSocket* s_del = NULL;
 419         char* target;
 420         unsigned int numberactive;
 421         sockaddr_in sock_us;     // our port number
 422         socklen_t uslen;         // length of our port number
 423
 424         /* Until THIS point, ServerInstance == NULL */
 425
 426         LoadAllModules(this);
 427
 428         printf("\nInspIRCd is now running!\n");
 429
 430         if (!Config->nofork)
 431         {
 432                 freopen("/dev/null","w",stdout);
 433                 freopen("/dev/null","w",stderr);
 434         }
 435
 436         /* Add the listening sockets used for client inbound connections
 437          * to the socket engine
 438          */
 439         for (int count = 0; count < stats->BoundPortCount; count++)
 440                 SE->AddFd(openSockfd[count],true,X_LISTEN);
 441
 442         WritePID(Config->PID);
 443
 444         /* main loop, this never returns */
 445         for (;;)
 446         {
 447                 /* time() seems to be a pretty expensive syscall, so avoid calling it too much.
 448                  * Once per loop iteration is pleanty.
 449                  */
 450                 OLDTIME = TIME;
 451                 TIME = time(NULL);
 452
 453                 /* Run background module timers every few seconds
 454                  * (the docs say modules shouldnt rely on accurate
 455                  * timing using this event, so we dont have to
 456                  * time this exactly).
 457                  */
 458                 if (((TIME % 8) == 0) && (!expire_run))
 459                 {
 460                         expire_lines();
 461                         FOREACH_MOD(I_OnBackgroundTimer,OnBackgroundTimer(TIME));
 462                         expire_run = true;
 463                         continue;
 464                 }
 465                 if ((TIME % 8) == 1)
 466                         expire_run = false;
 467
 468                 /* Once a second, do the background processing */
 469                 if (TIME != OLDTIME)
 470                         while (DoBackgroundUserStuff(TIME));
 471
 472                 /* Call the socket engine to wait on the active
 473                  * file descriptors. The socket engine has everything's
 474                  * descriptors in its list... dns, modules, users,
 475                  * servers... so its nice and easy, just one call.
 476                  */
 477                 SE->Wait(activefds);
 478
 479                 /**
 480                  * Now process each of the fd's. For users, we have a fast
 481                  * lookup table which can find a user by file descriptor, so
 482                  * processing them by fd isnt expensive. If we have a lot of
 483                  * listening ports or module sockets though, things could get
 484                  * ugly.
 485                  */
 486                 numberactive = activefds.size();
 487                 for (unsigned int activefd = 0; activefd < numberactive; activefd++)
 488                 {
 489                         int socket_type = SE->GetType(activefds[activefd]);
 490                         switch (socket_type)
 491                         {
 492                                 case X_ESTAB_CLIENT:
 493
 494                                         cu = fd_ref_table[activefds[activefd]];
 495                                         if (cu)
 496                                                 ProcessUser(cu);
 497
 498                                 break;
 499
 500                                 case X_ESTAB_MODULE:
 501
 502                                         /* Process module-owned sockets.
 503                                          * Modules are encouraged to inherit their sockets from
 504                                          * InspSocket so we can process them neatly like this.
 505                                          */
 506                                         s = socket_ref[activefds[activefd]];
 507
 508                                         if ((s) && (!s->Poll()))
 509                                         {
 510                                                 log(DEBUG,"Socket poll returned false, close and bail");
 511                                                 SE->DelFd(s->GetFd());
 512                                                 for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 513                                                 {
 514                                                         s_del = (InspSocket*)*a;
 515                                                         if ((s_del) && (s_del->GetFd() == activefds[activefd]))
 516                                                         {
 517                                                                 module_sockets.erase(a);
 518                                                                 break;
 519                                                         }
 520                                                 }
 521                                                 s->Close();
 522                                                 delete s;
 523                                         }
 524
 525                                 break;
 526
 527                                 case X_ESTAB_DNS:
 528
 529                                         /* When we are using single-threaded dns,
 530                                          * the sockets for dns end up in our mainloop.
 531                                          * When we are using multi-threaded dns,
 532                                          * each thread has its own basic poll() loop
 533                                          * within it, making them 'fire and forget'
 534                                          * and independent of the mainloop.
 535                                          */
 536 #ifndef THREADED_DNS
 537                                         dns_poll(activefds[activefd]);
 538 #endif
 539                                 break;
 540
 541                                 case X_LISTEN:
 542
 543                                         /* It's a listener */
 544                                         uslen = sizeof(sock_us);
 545                                         length = sizeof(client);
 546                                         incomingSockfd = accept (activefds[activefd],(struct sockaddr*)&client,&length);
 547                                         if (!getsockname(incomingSockfd,(sockaddr*)&sock_us,&uslen))
 548                                         {
 549                                                 in_port = ntohs(sock_us.sin_port);
 550                                                 log(DEBUG,"Accepted socket %d",incomingSockfd);
 551                                                 target = (char*)inet_ntoa(client.sin_addr);
 552                                                 /* Years and years ago, we used to resolve here
 553                                                  * using gethostbyaddr(). That is sucky and we
 554                                                  * don't do that any more...
 555                                                  */
 556                                                 if (incomingSockfd >= 0)
 557                                                 {
 558                                                         NonBlocking(incomingSockfd);
 559                                                         if (Config->GetIOHook(in_port))
 560                                                         {
 561                                                                 Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, target, in_port);
 562                                                         }
 563                                                         stats->statsAccept++;
 564                                                         AddClient(incomingSockfd, target, in_port, false, target);
 565                                                         log(DEBUG,"Adding client on port %lu fd=%lu",(unsigned long)in_port,(unsigned long)incomingSockfd);
 566                                                 }
 567                                                 else
 568                                                 {
 569                                                         WriteOpers("*** WARNING: accept() failed on port %lu (%s)",(unsigned long)in_port,target);
 570                                                         log(DEBUG,"accept failed: %lu",(unsigned long)in_port);
 571                                                         stats->statsRefused++;
 572                                                 }
 573                                         }
 574                                         else
 575                                         {
 576                                                 log(DEBUG,"Couldnt look up the port number for fd %lu (OS BROKEN?!)",incomingSockfd);
 577                                                 shutdown(incomingSockfd,2);
 578                                                 close(incomingSockfd);
 579                                         }
 580                                 break;
 581
 582                                 default:
 583                                         /* Something went wrong if we're in here.
 584                                          * In fact, so wrong, im not quite sure
 585                                          * what we would do, so for now, its going
 586                                          * to safely do bugger all.
 587                                          */
 588                                 break;
 589                         }
 590                 }
 591
 592         }
 593         /* This is never reached -- we hope! */
 594         return 0;
 595 }
 596
 597 /**********************************************************************************/
 598
 599 /**
 600  * An ircd in four lines! bwahahaha. ahahahahaha. ahahah *cough*.
 601  */
 602
 603 int main(int argc, char** argv)
 604 {
 605         ServerInstance = new InspIRCd(argc, argv);
 606         ServerInstance->Run();
 607         delete ServerInstance;
 608         return 0;
 609 }
 610