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
  97 user_hash clientlist;
  98 chan_hash chanlist;
  99 whowas_hash whowas;
 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         Parser = new CommandParser;
 192         Parser->SetupCommandTable();
 193         AddServerName(Config->ServerName);
 194         CheckDie();
 195         stats->BoundPortCount = BindPorts();
 196
 197         printf("\n");
 198         if (!Config->nofork)
 199         {
 200                 if (DaemonSeed() == ERROR)
 201                 {
 202                         printf("ERROR: could not go into daemon mode. Shutting down.\n");
 203                         Exit(ERROR);
 204                 }
 205         }
 206
 207         /* Because of limitations in kqueue on freebsd, we must fork BEFORE we
 208          * initialize the socket engine.
 209          */
 210         SE = new SocketEngine();
 211
 212         /* We must load the modules AFTER initializing the socket engine, now */
 213         LoadAllModules();
 214
 215         printf("\nInspIRCd is now running!\n");
 216
 217         return;
 218 }
 219
 220 std::string InspIRCd::GetVersionString()
 221 {
 222         char versiondata[MAXBUF];
 223 #ifdef THREADED_DNS
 224         char dnsengine[] = "multithread";
 225 #else
 226         char dnsengine[] = "singlethread";
 227 #endif
 228         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);
 229         return versiondata;
 230 }
 231
 232 char* InspIRCd::ModuleError()
 233 {
 234         return MODERR;
 235 }
 236
 237 void InspIRCd::erase_factory(int j)
 238 {
 239         int v = 0;
 240         for (std::vector<ircd_module*>::iterator t = factory.begin(); t != factory.end(); t++)
 241         {
 242                 if (v == j)
 243                 {
 244                         factory.erase(t);
 245                         factory.push_back(NULL);
 246                         return;
 247                 }
 248                 v++;
 249         }
 250 }
 251
 252 void InspIRCd::erase_module(int j)
 253 {
 254         int v1 = 0;
 255         for (std::vector<Module*>::iterator m = modules.begin(); m!= modules.end(); m++)
 256         {
 257                 if (v1 == j)
 258                 {
 259                         delete *m;
 260                         modules.erase(m);
 261                         modules.push_back(NULL);
 262                         break;
 263                 }
 264                 v1++;
 265         }
 266         int v2 = 0;
 267         for (std::vector<std::string>::iterator v = Config->module_names.begin(); v != Config->module_names.end(); v++)
 268         {
 269                 if (v2 == j)
 270                 {
 271                        Config->module_names.erase(v);
 272                        break;
 273                 }
 274                 v2++;
 275         }
 276
 277 }
 278
 279 bool InspIRCd::UnloadModule(const char* filename)
 280 {
 281         std::string filename_str = filename;
 282         for (unsigned int j = 0; j != Config->module_names.size(); j++)
 283         {
 284                 if (Config->module_names[j] == filename_str)
 285                 {
 286                         if (modules[j]->GetVersion().Flags & VF_STATIC)
 287                         {
 288                                 log(DEFAULT,"Failed to unload STATIC module %s",filename);
 289                                 snprintf(MODERR,MAXBUF,"Module not unloadable (marked static)");
 290                                 return false;
 291                         }
 292                         /* Give the module a chance to tidy out all its metadata */
 293                         for (chan_hash::iterator c = chanlist.begin(); c != chanlist.end(); c++)
 294                         {
 295                                 modules[j]->OnCleanup(TYPE_CHANNEL,c->second);
 296                         }
 297                         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 298                         {
 299                                 modules[j]->OnCleanup(TYPE_USER,u->second);
 300                         }
 301                         FOREACH_MOD OnUnloadModule(modules[j],Config->module_names[j]);
 302                         // found the module
 303                         log(DEBUG,"Deleting module...");
 304                         erase_module(j);
 305                         log(DEBUG,"Erasing module entry...");
 306                         erase_factory(j);
 307                         log(DEBUG,"Removing dependent commands...");
 308                         Parser->RemoveCommands(filename);
 309                         log(DEFAULT,"Module %s unloaded",filename);
 310                         MODCOUNT--;
 311                         return true;
 312                 }
 313         }
 314         log(DEFAULT,"Module %s is not loaded, cannot unload it!",filename);
 315         snprintf(MODERR,MAXBUF,"Module not loaded");
 316         return false;
 317 }
 318
 319 bool InspIRCd::LoadModule(const char* filename)
 320 {
 321         char modfile[MAXBUF];
 322 #ifdef STATIC_LINK
 323         snprintf(modfile,MAXBUF,"%s",filename);
 324 #else
 325         snprintf(modfile,MAXBUF,"%s/%s",Config->ModPath,filename);
 326 #endif
 327         std::string filename_str = filename;
 328 #ifndef STATIC_LINK
 329         if (!DirValid(modfile))
 330         {
 331                 log(DEFAULT,"Module %s is not within the modules directory.",modfile);
 332                 snprintf(MODERR,MAXBUF,"Module %s is not within the modules directory.",modfile);
 333                 return false;
 334         }
 335 #endif
 336         log(DEBUG,"Loading module: %s",modfile);
 337 #ifndef STATIC_LINK
 338         if (FileExists(modfile))
 339         {
 340 #endif
 341                 for (unsigned int j = 0; j < Config->module_names.size(); j++)
 342                 {
 343                         if (Config->module_names[j] == filename_str)
 344                         {
 345                                 log(DEFAULT,"Module %s is already loaded, cannot load a module twice!",modfile);
 346                                 snprintf(MODERR,MAXBUF,"Module already loaded");
 347                                 return false;
 348                         }
 349                 }
 350                 ircd_module* a = new ircd_module(modfile);
 351                 factory[MODCOUNT+1] = a;
 352                 if (factory[MODCOUNT+1]->LastError())
 353                 {
 354                         log(DEFAULT,"Unable to load %s: %s",modfile,factory[MODCOUNT+1]->LastError());
 355                         snprintf(MODERR,MAXBUF,"Loader/Linker error: %s",factory[MODCOUNT+1]->LastError());
 356                         MODCOUNT--;
 357                         return false;
 358                 }
 359                 if (factory[MODCOUNT+1]->factory)
 360                 {
 361                         Module* m = factory[MODCOUNT+1]->factory->CreateModule(MyServer);
 362                         modules[MODCOUNT+1] = m;
 363                         /* save the module and the module's classfactory, if
 364                          * this isnt done, random crashes can occur :/ */
 365                         Config->module_names.push_back(filename);
 366                 }
 367                 else
 368                 {
 369                         log(DEFAULT,"Unable to load %s",modfile);
 370                         snprintf(MODERR,MAXBUF,"Factory function failed!");
 371                         return false;
 372                 }
 373 #ifndef STATIC_LINK
 374         }
 375         else
 376         {
 377                 log(DEFAULT,"InspIRCd: startup: Module Not Found %s",modfile);
 378                 snprintf(MODERR,MAXBUF,"Module file could not be found");
 379                 return false;
 380         }
 381 #endif
 382         MODCOUNT++;
 383         FOREACH_MOD OnLoadModule(modules[MODCOUNT],filename_str);
 384         return true;
 385 }
 386
 387 int InspIRCd::Run()
 388 {
 389         bool expire_run = false;
 390         std::vector<int> activefds;
 391         int incomingSockfd;
 392         int in_port;
 393         userrec* cu = NULL;
 394         InspSocket* s = NULL;
 395         InspSocket* s_del = NULL;
 396         char* target;
 397         unsigned int numberactive;
 398         sockaddr_in sock_us;     // our port number
 399         socklen_t uslen;         // length of our port number
 400
 401         if (!Config->nofork)
 402         {
 403                 freopen("/dev/null","w",stdout);
 404                 freopen("/dev/null","w",stderr);
 405         }
 406
 407         /* Add the listening sockets used for client inbound connections
 408          * to the socket engine
 409          */
 410         for (int count = 0; count < stats->BoundPortCount; count++)
 411                 SE->AddFd(openSockfd[count],true,X_LISTEN);
 412
 413         WritePID(Config->PID);
 414
 415         /* main loop, this never returns */
 416         for (;;)
 417         {
 418                 /* time() seems to be a pretty expensive syscall, so avoid calling it too much.
 419                  * Once per loop iteration is pleanty.
 420                  */
 421                 OLDTIME = TIME;
 422                 TIME = time(NULL);
 423
 424                 /* Run background module timers every few seconds
 425                  * (the docs say modules shouldnt rely on accurate
 426                  * timing using this event, so we dont have to
 427                  * time this exactly).
 428                  */
 429                 if (((TIME % 8) == 0) && (!expire_run))
 430                 {
 431                         expire_lines();
 432                         FOREACH_MOD OnBackgroundTimer(TIME);
 433                         expire_run = true;
 434                         continue;
 435                 }
 436                 if ((TIME % 8) == 1)
 437                         expire_run = false;
 438
 439                 /* Once a second, do the background processing */
 440                 if (TIME != OLDTIME)
 441                         while (DoBackgroundUserStuff(TIME));
 442
 443                 /* Call the socket engine to wait on the active
 444                  * file descriptors. The socket engine has everything's
 445                  * descriptors in its list... dns, modules, users,
 446                  * servers... so its nice and easy, just one call.
 447                  */
 448                 SE->Wait(activefds);
 449
 450                 /**
 451                  * Now process each of the fd's. For users, we have a fast
 452                  * lookup table which can find a user by file descriptor, so
 453                  * processing them by fd isnt expensive. If we have a lot of
 454                  * listening ports or module sockets though, things could get
 455                  * ugly.
 456                  */
 457                 numberactive = activefds.size();
 458                 for (unsigned int activefd = 0; activefd < numberactive; activefd++)
 459                 {
 460                         int socket_type = SE->GetType(activefds[activefd]);
 461                         switch (socket_type)
 462                         {
 463                                 case X_ESTAB_CLIENT:
 464
 465                                         cu = fd_ref_table[activefds[activefd]];
 466                                         if (cu)
 467                                                 ProcessUser(cu);
 468
 469                                 break;
 470
 471                                 case X_ESTAB_MODULE:
 472
 473                                         /* Process module-owned sockets.
 474                                          * Modules are encouraged to inherit their sockets from
 475                                          * InspSocket so we can process them neatly like this.
 476                                          */
 477                                         s = socket_ref[activefds[activefd]];
 478
 479                                         if ((s) && (!s->Poll()))
 480                                         {
 481                                                 log(DEBUG,"Socket poll returned false, close and bail");
 482                                                 SE->DelFd(s->GetFd());
 483                                                 for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 484                                                 {
 485                                                         s_del = (InspSocket*)*a;
 486                                                         if ((s_del) && (s_del->GetFd() == activefds[activefd]))
 487                                                         {
 488                                                                 module_sockets.erase(a);
 489                                                                 break;
 490                                                         }
 491                                                 }
 492                                                 s->Close();
 493                                                 delete s;
 494                                         }
 495
 496                                 break;
 497
 498                                 case X_ESTAB_DNS:
 499
 500                                         /* When we are using single-threaded dns,
 501                                          * the sockets for dns end up in our mainloop.
 502                                          * When we are using multi-threaded dns,
 503                                          * each thread has its own basic poll() loop
 504                                          * within it, making them 'fire and forget'
 505                                          * and independent of the mainloop.
 506                                          */
 507 #ifndef THREADED_DNS
 508                                         dns_poll(activefds[activefd]);
 509 #endif
 510                                 break;
 511
 512                                 case X_LISTEN:
 513
 514                                         /* It's a listener */
 515                                         uslen = sizeof(sock_us);
 516                                         length = sizeof(client);
 517                                         incomingSockfd = accept (activefds[activefd],(struct sockaddr*)&client,&length);
 518                                         if (!getsockname(incomingSockfd,(sockaddr*)&sock_us,&uslen))
 519                                         {
 520                                                 in_port = ntohs(sock_us.sin_port);
 521                                                 log(DEBUG,"Accepted socket %d",incomingSockfd);
 522                                                 target = (char*)inet_ntoa(client.sin_addr);
 523                                                 /* Years and years ago, we used to resolve here
 524                                                  * using gethostbyaddr(). That is sucky and we
 525                                                  * don't do that any more...
 526                                                  */
 527                                                 if (incomingSockfd >= 0)
 528                                                 {
 529                                                         if (IOHookModule)
 530                                                         {
 531                                                                 IOHookModule->OnRawSocketAccept(incomingSockfd, target, in_port);
 532                                                         }
 533                                                         stats->statsAccept++;
 534                                                         AddClient(incomingSockfd, target, in_port, false, target);
 535                                                         log(DEBUG,"Adding client on port %lu fd=%lu",(unsigned long)in_port,(unsigned long)incomingSockfd);
 536                                                 }
 537                                                 else
 538                                                 {
 539                                                         WriteOpers("*** WARNING: accept() failed on port %lu (%s)",(unsigned long)in_port,target);
 540                                                         log(DEBUG,"accept failed: %lu",(unsigned long)in_port);
 541                                                         stats->statsRefused++;
 542                                                 }
 543                                         }
 544                                         else
 545                                         {
 546                                                 log(DEBUG,"Couldnt look up the port number for fd %lu (OS BROKEN?!)",incomingSockfd);
 547                                                 shutdown(incomingSockfd,2);
 548                                                 close(incomingSockfd);
 549                                         }
 550                                 break;
 551
 552                                 default:
 553                                         /* Something went wrong if we're in here.
 554                                          * In fact, so wrong, im not quite sure
 555                                          * what we would do, so for now, its going
 556                                          * to safely do bugger all.
 557                                          */
 558                                 break;
 559                         }
 560                 }
 561
 562         }
 563         /* This is never reached -- we hope! */
 564         return 0;
 565 }
 566
 567 /**********************************************************************************/
 568
 569 /**
 570  * An ircd in four lines! bwahahaha. ahahahahaha. ahahah *cough*.
 571  */
 572
 573 int main(int argc, char** argv)
 574 {
 575         ServerInstance = new InspIRCd(argc, argv);
 576         ServerInstance->Run();
 577         delete ServerInstance;
 578         return 0;
 579 }
 580