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