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