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 #include <sched.h>
  41 #ifdef THREADED_DNS
  42 #include <pthread.h>
  43 #endif
  44 #include "users.h"
  45 #include "ctables.h"
  46 #include "globals.h"
  47 #include "modules.h"
  48 #include "dynamic.h"
  49 #include "wildcard.h"
  50 #include "message.h"
  51 #include "mode.h"
  52 #include "commands.h"
  53 #include "xline.h"
  54 #include "inspstring.h"
  55 #include "dnsqueue.h"
  56 #include "helperfuncs.h"
  57 #include "hashcomp.h"
  58 #include "socketengine.h"
  59 #include "userprocess.h"
  60 #include "socket.h"
  61 #include "dns.h"
  62 #include "typedefs.h"
  63 #include "command_parse.h"
  64
  65 InspIRCd* ServerInstance;
  66
  67 int WHOWAS_STALE = 48; // default WHOWAS Entries last 2 days before they go 'stale'
  68 int WHOWAS_MAX = 100;  // default 100 people maximum in the WHOWAS list
  69
  70 extern std::vector<Module*> modules;
  71 extern std::vector<ircd_module*> factory;
  72 std::vector<InspSocket*> module_sockets;
  73 std::vector<userrec*> local_users;
  74
  75 extern int MODCOUNT;
  76 int openSockfd[MAXSOCKS];
  77 sockaddr_in client,server;
  78 socklen_t length;
  79 extern Module* IOHookModule;
  80
  81 extern InspSocket* socket_ref[65535];
  82
  83 time_t TIME = time(NULL), OLDTIME = time(NULL);
  84
  85 SocketEngine* SE = NULL;
  86
  87 // This table references users by file descriptor.
  88 // its an array to make it VERY fast, as all lookups are referenced
  89 // by an integer, meaning there is no need for a scan/search operation.
  90 userrec* fd_ref_table[65536];
  91
  92 serverstats* stats = new serverstats;
  93 Server* MyServer = new Server;
  94 ServerConfig *Config = new ServerConfig;
  95 CommandParser *Parser = NULL;
  96 ModeParser *ModeGrok = NULL;
  97
  98 user_hash clientlist;
  99 chan_hash chanlist;
 100 whowas_hash whowas;
 101 servernamelist servernames;
 102 char lowermap[255];
 103
 104 void AddServerName(std::string servername)
 105 {
 106         log(DEBUG,"Adding server name: %s",servername.c_str());
 107         for (servernamelist::iterator a = servernames.begin(); a < servernames.end(); a++)
 108         {
 109                 if (*a == servername)
 110                         return;
 111         }
 112         servernames.push_back(servername);
 113 }
 114
 115 const char* FindServerNamePtr(std::string servername)
 116 {
 117         for (servernamelist::iterator a = servernames.begin(); a < servernames.end(); a++)
 118         {
 119                 if (*a == servername)
 120                         return a->c_str();
 121         }
 122         AddServerName(servername);
 123         return FindServerNamePtr(servername);
 124 }
 125
 126 std::string InspIRCd::GetRevision()
 127 {
 128         /* w00t got me to replace a bunch of strtok_r
 129          * with something nicer, so i did this. Its the
 130          * same thing really, only in C++. It places the
 131          * text into a std::stringstream which is a readable
 132          * and writeable buffer stream, and then pops two
 133          * words off it, space delimited. Because it reads
 134          * into the same variable twice, the first word
 135          * is discarded, and the second one returned.
 136          */
 137         std::stringstream Revision("$Revision$");
 138         std::string single;
 139         Revision >> single >> single;
 140         return single;
 141 }
 142
 143
 144
 145 InspIRCd::InspIRCd(int argc, char** argv)
 146 {
 147         Start();
 148         module_sockets.clear();
 149         this->startup_time = time(NULL);
 150         srand(time(NULL));
 151         log(DEBUG,"*** InspIRCd starting up!");
 152         if (!FileExists(CONFIG_FILE))
 153         {
 154                 printf("ERROR: Cannot open config file: %s\nExiting...\n",CONFIG_FILE);
 155                 log(DEFAULT,"main: no config");
 156                 printf("ERROR: Your config file is missing, this IRCd will self destruct in 10 seconds!\n");
 157                 Exit(ERROR);
 158         }
 159         if (argc > 1) {
 160                 for (int i = 1; i < argc; i++)
 161                 {
 162                         if (!strcmp(argv[i],"-nofork")) {
 163                                 Config->nofork = true;
 164                         }
 165                         if (!strcmp(argv[i],"-wait")) {
 166                                 sleep(6);
 167                         }
 168                         if (!strcmp(argv[i],"-nolimit")) {
 169                                 Config->unlimitcore = true;
 170                         }
 171                 }
 172         }
 173
 174         strlcpy(Config->MyExecutable,argv[0],MAXBUF);
 175
 176         // initialize the lowercase mapping table
 177         for (unsigned int cn = 0; cn < 256; cn++)
 178                 lowermap[cn] = cn;
 179         // lowercase the uppercase chars
 180         for (unsigned int cn = 65; cn < 91; cn++)
 181                 lowermap[cn] = tolower(cn);
 182         // now replace the specific chars for scandanavian comparison
 183         lowermap[(unsigned)'['] = '{';
 184         lowermap[(unsigned)']'] = '}';
 185         lowermap[(unsigned)'\\'] = '|';
 186
 187
 188         OpenLog(argv, argc);
 189         Config->ClearStack();
 190         Config->Read(true,NULL);
 191         CheckRoot();
 192         ModeGrok = new ModeParser();
 193         Parser = new CommandParser();
 194         AddServerName(Config->ServerName);
 195         CheckDie();
 196         stats->BoundPortCount = BindPorts();
 197
 198         printf("\n");
 199         if (!Config->nofork)
 200         {
 201                 if (DaemonSeed() == ERROR)
 202                 {
 203                         printf("ERROR: could not go into daemon mode. Shutting down.\n");
 204                         Exit(ERROR);
 205                 }
 206         }
 207
 208         /* Because of limitations in kqueue on freebsd, we must fork BEFORE we
 209          * initialize the socket engine.
 210          */
 211         SE = new SocketEngine();
 212
 213         /* We must load the modules AFTER initializing the socket engine, now */
 214         LoadAllModules();
 215
 216         printf("\nInspIRCd is now running!\n");
 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                         FOREACH_MOD OnUnloadModule(modules[j],Config->module_names[j]);
 303                         // found the module
 304                         log(DEBUG,"Deleting module...");
 305                         erase_module(j);
 306                         log(DEBUG,"Erasing module entry...");
 307                         erase_factory(j);
 308                         log(DEBUG,"Removing dependent commands...");
 309                         Parser->RemoveCommands(filename);
 310                         log(DEFAULT,"Module %s unloaded",filename);
 311                         MODCOUNT--;
 312                         return true;
 313                 }
 314         }
 315         log(DEFAULT,"Module %s is not loaded, cannot unload it!",filename);
 316         snprintf(MODERR,MAXBUF,"Module not loaded");
 317         return false;
 318 }
 319
 320 bool InspIRCd::LoadModule(const char* filename)
 321 {
 322         char modfile[MAXBUF];
 323 #ifdef STATIC_LINK
 324         snprintf(modfile,MAXBUF,"%s",filename);
 325 #else
 326         snprintf(modfile,MAXBUF,"%s/%s",Config->ModPath,filename);
 327 #endif
 328         std::string filename_str = filename;
 329 #ifndef STATIC_LINK
 330         if (!DirValid(modfile))
 331         {
 332                 log(DEFAULT,"Module %s is not within the modules directory.",modfile);
 333                 snprintf(MODERR,MAXBUF,"Module %s is not within the modules directory.",modfile);
 334                 return false;
 335         }
 336 #endif
 337         log(DEBUG,"Loading module: %s",modfile);
 338 #ifndef STATIC_LINK
 339         if (FileExists(modfile))
 340         {
 341 #endif
 342                 for (unsigned int j = 0; j < Config->module_names.size(); j++)
 343                 {
 344                         if (Config->module_names[j] == filename_str)
 345                         {
 346                                 log(DEFAULT,"Module %s is already loaded, cannot load a module twice!",modfile);
 347                                 snprintf(MODERR,MAXBUF,"Module already loaded");
 348                                 return false;
 349                         }
 350                 }
 351                 ircd_module* a = new ircd_module(modfile);
 352                 factory[MODCOUNT+1] = a;
 353                 if (factory[MODCOUNT+1]->LastError())
 354                 {
 355                         log(DEFAULT,"Unable to load %s: %s",modfile,factory[MODCOUNT+1]->LastError());
 356                         snprintf(MODERR,MAXBUF,"Loader/Linker error: %s",factory[MODCOUNT+1]->LastError());
 357                         MODCOUNT--;
 358                         return false;
 359                 }
 360                 if (factory[MODCOUNT+1]->factory)
 361                 {
 362                         Module* m = factory[MODCOUNT+1]->factory->CreateModule(MyServer);
 363                         modules[MODCOUNT+1] = m;
 364                         /* save the module and the module's classfactory, if
 365                          * this isnt done, random crashes can occur :/ */
 366                         Config->module_names.push_back(filename);
 367                 }
 368                 else
 369                 {
 370                         log(DEFAULT,"Unable to load %s",modfile);
 371                         snprintf(MODERR,MAXBUF,"Factory function failed!");
 372                         return false;
 373                 }
 374 #ifndef STATIC_LINK
 375         }
 376         else
 377         {
 378                 log(DEFAULT,"InspIRCd: startup: Module Not Found %s",modfile);
 379                 snprintf(MODERR,MAXBUF,"Module file could not be found");
 380                 return false;
 381         }
 382 #endif
 383         MODCOUNT++;
 384         FOREACH_MOD OnLoadModule(modules[MODCOUNT],filename_str);
 385         return true;
 386 }
 387
 388 int InspIRCd::Run()
 389 {
 390         bool expire_run = false;
 391         std::vector<int> activefds;
 392         int incomingSockfd;
 393         int in_port;
 394         userrec* cu = NULL;
 395         InspSocket* s = NULL;
 396         InspSocket* s_del = NULL;
 397         char* target;
 398         unsigned int numberactive;
 399         sockaddr_in sock_us;     // our port number
 400         socklen_t uslen;         // length of our port number
 401
 402         if (!Config->nofork)
 403         {
 404                 freopen("/dev/null","w",stdout);
 405                 freopen("/dev/null","w",stderr);
 406         }
 407
 408         /* Add the listening sockets used for client inbound connections
 409          * to the socket engine
 410          */
 411         for (int count = 0; count < stats->BoundPortCount; count++)
 412                 SE->AddFd(openSockfd[count],true,X_LISTEN);
 413
 414         WritePID(Config->PID);
 415
 416         /* main loop, this never returns */
 417         for (;;)
 418         {
 419                 /* time() seems to be a pretty expensive syscall, so avoid calling it too much.
 420                  * Once per loop iteration is pleanty.
 421                  */
 422                 OLDTIME = TIME;
 423                 TIME = time(NULL);
 424
 425                 /* Run background module timers every few seconds
 426                  * (the docs say modules shouldnt rely on accurate
 427                  * timing using this event, so we dont have to
 428                  * time this exactly).
 429                  */
 430                 if (((TIME % 8) == 0) && (!expire_run))
 431                 {
 432                         expire_lines();
 433                         FOREACH_MOD OnBackgroundTimer(TIME);
 434                         expire_run = true;
 435                         continue;
 436                 }
 437                 if ((TIME % 8) == 1)
 438                         expire_run = false;
 439
 440                 /* Once a second, do the background processing */
 441                 if (TIME != OLDTIME)
 442                         while (DoBackgroundUserStuff(TIME));
 443
 444                 /* Call the socket engine to wait on the active
 445                  * file descriptors. The socket engine has everything's
 446                  * descriptors in its list... dns, modules, users,
 447                  * servers... so its nice and easy, just one call.
 448                  */
 449                 SE->Wait(activefds);
 450
 451                 /**
 452                  * Now process each of the fd's. For users, we have a fast
 453                  * lookup table which can find a user by file descriptor, so
 454                  * processing them by fd isnt expensive. If we have a lot of
 455                  * listening ports or module sockets though, things could get
 456                  * ugly.
 457                  */
 458                 numberactive = activefds.size();
 459                 for (unsigned int activefd = 0; activefd < numberactive; activefd++)
 460                 {
 461                         int socket_type = SE->GetType(activefds[activefd]);
 462                         switch (socket_type)
 463                         {
 464                                 case X_ESTAB_CLIENT:
 465
 466                                         cu = fd_ref_table[activefds[activefd]];
 467                                         if (cu)
 468                                                 ProcessUser(cu);
 469
 470                                 break;
 471
 472                                 case X_ESTAB_MODULE:
 473
 474                                         /* Process module-owned sockets.
 475                                          * Modules are encouraged to inherit their sockets from
 476                                          * InspSocket so we can process them neatly like this.
 477                                          */
 478                                         s = socket_ref[activefds[activefd]];
 479
 480                                         if ((s) && (!s->Poll()))
 481                                         {
 482                                                 log(DEBUG,"Socket poll returned false, close and bail");
 483                                                 SE->DelFd(s->GetFd());
 484                                                 for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 485                                                 {
 486                                                         s_del = (InspSocket*)*a;
 487                                                         if ((s_del) && (s_del->GetFd() == activefds[activefd]))
 488                                                         {
 489                                                                 module_sockets.erase(a);
 490                                                                 break;
 491                                                         }
 492                                                 }
 493                                                 s->Close();
 494                                                 delete s;
 495                                         }
 496
 497                                 break;
 498
 499                                 case X_ESTAB_DNS:
 500
 501                                         /* When we are using single-threaded dns,
 502                                          * the sockets for dns end up in our mainloop.
 503                                          * When we are using multi-threaded dns,
 504                                          * each thread has its own basic poll() loop
 505                                          * within it, making them 'fire and forget'
 506                                          * and independent of the mainloop.
 507                                          */
 508 #ifndef THREADED_DNS
 509                                         dns_poll(activefds[activefd]);
 510 #endif
 511                                 break;
 512
 513                                 case X_LISTEN:
 514
 515                                         /* It's a listener */
 516                                         uslen = sizeof(sock_us);
 517                                         length = sizeof(client);
 518                                         incomingSockfd = accept (activefds[activefd],(struct sockaddr*)&client,&length);
 519                                         if (!getsockname(incomingSockfd,(sockaddr*)&sock_us,&uslen))
 520                                         {
 521                                                 in_port = ntohs(sock_us.sin_port);
 522                                                 log(DEBUG,"Accepted socket %d",incomingSockfd);
 523                                                 target = (char*)inet_ntoa(client.sin_addr);
 524                                                 /* Years and years ago, we used to resolve here
 525                                                  * using gethostbyaddr(). That is sucky and we
 526                                                  * don't do that any more...
 527                                                  */
 528                                                 if (incomingSockfd >= 0)
 529                                                 {
 530                                                         if (IOHookModule)
 531                                                         {
 532                                                                 IOHookModule->OnRawSocketAccept(incomingSockfd, target, in_port);
 533                                                         }
 534                                                         stats->statsAccept++;
 535                                                         AddClient(incomingSockfd, target, in_port, false, target);
 536                                                         log(DEBUG,"Adding client on port %lu fd=%lu",(unsigned long)in_port,(unsigned long)incomingSockfd);
 537                                                 }
 538                                                 else
 539                                                 {
 540                                                         WriteOpers("*** WARNING: accept() failed on port %lu (%s)",(unsigned long)in_port,target);
 541                                                         log(DEBUG,"accept failed: %lu",(unsigned long)in_port);
 542                                                         stats->statsRefused++;
 543                                                 }
 544                                         }
 545                                         else
 546                                         {
 547                                                 log(DEBUG,"Couldnt look up the port number for fd %lu (OS BROKEN?!)",incomingSockfd);
 548                                                 shutdown(incomingSockfd,2);
 549                                                 close(incomingSockfd);
 550                                         }
 551                                 break;
 552
 553                                 default:
 554                                         /* Something went wrong if we're in here.
 555                                          * In fact, so wrong, im not quite sure
 556                                          * what we would do, so for now, its going
 557                                          * to safely do bugger all.
 558                                          */
 559                                 break;
 560                         }
 561                 }
 562
 563         }
 564         /* This is never reached -- we hope! */
 565         return 0;
 566 }
 567
 568 /**********************************************************************************/
 569
 570 /**
 571  * An ircd in four lines! bwahahaha. ahahahahaha. ahahah *cough*.
 572  */
 573
 574 int main(int argc, char** argv)
 575 {
 576         ServerInstance = new InspIRCd(argc, argv);
 577         ServerInstance->Run();
 578         delete ServerInstance;
 579         return 0;
 580 }
 581