src/userprocess.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 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 "typedefs.h"
  61 #include "command_parse.h"
  62 #include "cull_list.h"
  63
  64 extern int MODCOUNT;
  65 extern struct sockaddr_in client,server;
  66 extern socklen_t length;
  67 extern std::vector<Module*> modules;
  68 extern std::vector<ircd_module*> factory;
  69 extern std::vector<InspSocket*> module_sockets;
  70 extern time_t TIME;
  71 extern time_t OLDTIME;
  72 extern std::vector<userrec*> local_users;
  73 char LOG_FILE[MAXBUF];
  74
  75 extern InspIRCd* ServerInstance;
  76 extern ServerConfig *Config;
  77 extern userrec* fd_ref_table[MAX_DESCRIPTORS];
  78 char data[65536];
  79
  80 extern user_hash clientlist;
  81 extern chan_hash chanlist;
  82
  83 void ProcessUser(userrec* cu)
  84 {
  85         int result = EAGAIN;
  86
  87         if (cu->fd == FD_MAGIC_NUMBER)
  88                 return;
  89
  90         log(DEBUG,"Processing user with fd %d",cu->fd);
  91
  92         if (Config->GetIOHook(cu->port))
  93         {
  94                 int result2 = 0;
  95                 int MOD_RESULT = 0;
  96
  97                 try
  98                 {
  99                         MOD_RESULT = Config->GetIOHook(cu->port)->OnRawSocketRead(cu->fd,data,65535,result2);
 100                         log(DEBUG,"Data result returned by module: %d",MOD_RESULT);
 101                 }
 102                 catch (ModuleException& modexcept)
 103                 {
 104                         log(DEBUG,"Module exception cought: %s",modexcept.GetReason()); \
 105                 }
 106
 107                 if (MOD_RESULT < 0)
 108                 {
 109                         result = -EAGAIN;
 110                 }
 111                 else
 112                 {
 113                         result = result2;
 114                 }
 115         }
 116         else
 117         {
 118                 result = cu->ReadData(data, 65535);
 119         }
 120
 121         log(DEBUG,"Read result: %d",result);
 122
 123         if ((result) && (result != -EAGAIN))
 124         {
 125                 userrec *current;
 126                 int currfd;
 127                 int floodlines;
 128
 129                 ServerInstance->stats->statsRecv += result;
 130                 /*
 131                  * perform a check on the raw buffer as an array (not a string!) to remove
 132                  * characters 0 and 7 which are illegal in the RFC - replace them with spaces.
 133                  * hopefully this should stop even more people whining about "Unknown command: *"
 134                  */
 135
 136                 /*
 137                  * XXX - potential replacement for the below using my beloved pointers. --w00t
 138                  *
 139                  * for (char *c = data; data && *data; data++)
 140                  * {
 141                  *      if (*data == 0 || *data == 7)
 142                  *              data = ' ';
 143                  * }
 144                  */
 145
 146                 for (int checker = 0; checker < result; checker++)
 147                 {
 148                         if ((data[checker] == 0) || (data[checker] == 7))
 149                                 data[checker] = ' ';
 150                 }
 151
 152                 if (result > 0)
 153                         data[result] = '\0';
 154
 155                 current = cu;
 156                 currfd = current->fd;
 157                 floodlines = 0;
 158
 159                 // add the data to the users buffer
 160                 if (result > 0)
 161                 {
 162                         if (!current->AddBuffer(data))
 163                         {
 164                                 // AddBuffer returned false, theres too much data in the user's buffer and theyre up to no good.
 165                                 if (current->registered == 7)
 166                                 {
 167                                         // Make sure they arn't flooding long lines.
 168                                         if (TIME > current->reset_due)
 169                                         {
 170                                                 current->reset_due = TIME + current->threshold;
 171                                                 current->lines_in = 0;
 172                                         }
 173
 174                                         current->lines_in++;
 175
 176                                         if (current->lines_in > current->flood)
 177                                         {
 178                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 179                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 180                                                 kill_link(current,"Excess flood");
 181                                                 return;
 182                                         }
 183                                         else
 184                                         {
 185                                                 WriteServ(currfd, "NOTICE %s :Your previous line was too long and was not delivered (Over 512chars) Please shorten it.", current->nick);
 186                                                 current->recvq = "";
 187                                         }
 188                                 }
 189                                 else
 190                                 {
 191                                         WriteOpers("*** Excess flood from %s",(char*)inet_ntoa(current->ip4));
 192                                         log(DEFAULT,"Excess flood from: %s",(char*)inet_ntoa(current->ip4));
 193                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 194                                         apply_lines(APPLY_ZLINES);
 195                                 }
 196
 197                                 return;
 198                         }
 199
 200                         if (current->recvq.length() > (unsigned)Config->NetBufferSize)
 201                         {
 202                                 if (current->registered == 7)
 203                                 {
 204                                         kill_link(current,"RecvQ exceeded");
 205                                 }
 206                                 else
 207                                 {
 208                                         WriteOpers("*** Excess flood from %s",(char*)inet_ntoa(current->ip4));
 209                                         log(DEFAULT,"Excess flood from: %s",(char*)inet_ntoa(current->ip4));
 210                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 211                                         apply_lines(APPLY_ZLINES);
 212                                 }
 213
 214                                 return;
 215                         }
 216
 217                         // while there are complete lines to process...
 218                         while (current->BufferIsReady())
 219                         {
 220                                 char sanitized[MAXBUF];
 221
 222                                 floodlines++;
 223                                 if (TIME > current->reset_due)
 224                                 {
 225                                         current->reset_due = TIME + current->threshold;
 226                                         current->lines_in = 0;
 227                                 }
 228
 229                                 current->lines_in++;
 230
 231                                 if (current->lines_in > current->flood)
 232                                 {
 233                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 234                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 235                                         kill_link(current,"Excess flood");
 236                                         return;
 237                                 }
 238
 239                                 if ((floodlines > current->flood) && (current->flood != 0))
 240                                 {
 241                                         if (current->registered == 7)
 242                                         {
 243                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 244                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 245                                                 kill_link(current,"Excess flood");
 246                                         }
 247                                         else
 248                                         {
 249                                                 add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 250                                                 apply_lines(APPLY_ZLINES);
 251                                         }
 252
 253                                         return;
 254                                 }
 255
 256                                 // use GetBuffer to copy single lines into the sanitized string
 257                                 std::string single_line = current->GetBuffer();
 258                                 current->bytes_in += single_line.length();
 259                                 current->cmds_in++;
 260                                 strlcpy(sanitized,single_line.c_str(),511);
 261
 262                                 if (*sanitized)
 263                                 {
 264                                         userrec* old_comp = fd_ref_table[currfd];
 265
 266                                         ServerInstance->Parser->ProcessBuffer(sanitized,current);
 267                                         /*
 268                                          * look for the user's record in case it's changed... if theyve quit,
 269                                          * we cant do anything more with their buffer, so bail.
 270                                          * there used to be an ugly, slow loop here. Now we have a reference
 271                                          * table, life is much easier (and FASTER)
 272                                          */
 273                                         userrec* new_comp = fd_ref_table[currfd];
 274                                         if ((currfd < 0) || (!fd_ref_table[currfd]) || (old_comp != new_comp))
 275                                         {
 276                                                 return;
 277                                         }
 278                                         else
 279                                         {
 280                                                 /* The user is still here, flush their buffer */
 281                                                 current->FlushWriteBuf();
 282                                         }
 283                                 }
 284                         }
 285
 286                         return;
 287                 }
 288
 289                 if ((result == -1) && (errno != EAGAIN) && (errno != EINTR))
 290                 {
 291                         log(DEBUG,"killing: %s",cu->nick);
 292                         kill_link(cu,strerror(errno));
 293                         return;
 294                 }
 295         }
 296
 297         // result EAGAIN means nothing read
 298         else if ((result == EAGAIN) || (result == -EAGAIN))
 299         {
 300                 /* do nothing */
 301         }
 302         else if (result == 0)
 303         {
 304                 log(DEBUG,"InspIRCd: Exited: %s",cu->nick);
 305                 kill_link(cu,"Client exited");
 306                 log(DEBUG,"Bailing from client exit");
 307                 return;
 308         }
 309 }
 310
 311 void DoSocketTimeouts(time_t TIME)
 312 {
 313         unsigned int numsockets = module_sockets.size();
 314         SocketEngine* SE = ServerInstance->SE;
 315
 316         for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 317         {
 318                 InspSocket* s = (InspSocket*)*a;
 319                 if (s->Timeout(TIME))
 320                 {
 321                         log(DEBUG,"Socket poll returned false, close and bail");
 322                         SE->DelFd(s->GetFd());
 323                         s->Close();
 324                         module_sockets.erase(a);
 325                         delete s;
 326                         break;
 327                 }
 328
 329                 if (module_sockets.size() != numsockets)
 330                         break;
 331         }
 332 }
 333
 334 /**
 335  * This function is called once a second from the mainloop.
 336  * It is intended to do background checking on all the user structs, e.g.
 337  * stuff like ping checks, registration timeouts, etc. This function is
 338  * also responsible for checking if InspSocket derived classes are timed out.
 339  */
 340 void DoBackgroundUserStuff(time_t TIME)
 341 {
 342         CullList* GlobalGoners = new CullList();
 343
 344         for (std::vector<userrec*>::iterator count2 = local_users.begin(); count2 != local_users.end(); count2++)
 345         {
 346                 /* Sanity checks for corrupted iterators (yes, really) */
 347                 userrec* curr = NULL;
 348
 349                 if (*count2)
 350                         curr = (userrec*)(*count2);
 351                 if ((long)curr == -1)
 352                         return;
 353
 354                 if (curr)
 355                 {
 356                         /*
 357                          * registration timeout -- didnt send USER/NICK/HOST
 358                          * in the time specified in their connection class.
 359                          */
 360                         if (((unsigned)TIME > (unsigned)curr->timeout) && (curr->registered != 7))
 361                         {
 362                                 log(DEBUG,"InspIRCd: registration timeout: %s",curr->nick);
 363                                 GlobalGoners->AddItem(curr,"Registration timeout");
 364                                 continue;
 365                         }
 366
 367                         /*
 368                          * user has signed on with USER/NICK/PASS, and dns has completed, all the modules
 369                          * say this user is ok to proceed, fully connect them.
 370                          */
 371                         if ((TIME > curr->signon) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 372                         {
 373                                 curr->dns_done = true;
 374                                 ServerInstance->stats->statsDnsBad++;
 375                                 FullConnectUser(curr,GlobalGoners);
 376                                 continue;
 377                         }
 378
 379                         if ((curr->dns_done) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 380                         {
 381                                 log(DEBUG,"dns done, registered=3, and modules ready, OK");
 382                                 FullConnectUser(curr,GlobalGoners);
 383                                 continue;
 384                         }
 385
 386                         // It's time to PING this user. Send them a ping.
 387                         if ((TIME > curr->nping) && (curr->registered == 7))
 388                         {
 389                                 // This user didn't answer the last ping, remove them
 390                                 if (!curr->lastping)
 391                                 {
 392                                         GlobalGoners->AddItem(curr,"Ping timeout");
 393                                         continue;
 394                                 }
 395
 396                                 Write(curr->fd,"PING :%s",Config->ServerName);
 397                                 curr->lastping = 0;
 398                                 curr->nping = TIME+curr->pingmax;
 399                         }
 400
 401                         /*
 402                          * We can flush the write buffer as the last thing we do, because if they
 403                          * match any of the above conditions its no use flushing their buffer anyway.
 404                          */
 405                         curr->FlushWriteBuf();
 406
 407                         if (curr->GetWriteError() != "")
 408                         {
 409                                 GlobalGoners->AddItem(curr,curr->GetWriteError());
 410                                 continue;
 411                         }
 412                 }
 413         }
 414
 415         /* Remove all the queued users who are due to be quit, free memory used. */
 416         GlobalGoners->Apply();
 417         delete GlobalGoners;
 418         return;
 419 }
 420
 421 void OpenLog(char** argv, int argc)
 422 {
 423         if (!*LOG_FILE)
 424         {
 425                 if (Config->logpath == "")
 426                 {
 427                         Config->logpath = GetFullProgDir(argv,argc) + "/ircd.log";
 428                 }
 429         }
 430         else
 431         {
 432                 Config->log_file = fopen(LOG_FILE,"a+");
 433
 434                 if (!Config->log_file)
 435                 {
 436                         printf("ERROR: Could not write to logfile %s, bailing!\n\n",Config->logpath.c_str());
 437                         Exit(ERROR);
 438                 }
 439
 440                 return;
 441         }
 442
 443         Config->log_file = fopen(Config->logpath.c_str(),"a+");
 444
 445         if (!Config->log_file)
 446         {
 447                 printf("ERROR: Could not write to logfile %s, bailing!\n\n",Config->logpath.c_str());
 448                 Exit(ERROR);
 449         }
 450 }
 451
 452
 453 void CheckRoot()
 454 {
 455         if (geteuid() == 0)
 456         {
 457                 printf("WARNING!!! You are running an irc server as ROOT!!! DO NOT DO THIS!!!\n\n");
 458                 log(DEFAULT,"InspIRCd: startup: not starting with UID 0!");
 459                 Exit(ERROR);
 460         }
 461 }
 462
 463
 464 void CheckDie()
 465 {
 466         if (*Config->DieValue)
 467         {
 468                 printf("WARNING: %s\n\n",Config->DieValue);
 469                 log(DEFAULT,"Uh-Oh, somebody didn't read their config file: '%s'",Config->DieValue);
 470                 Exit(ERROR);
 471         }
 472 }
 473
 474 /* We must load the modules AFTER initializing the socket engine, now */
 475 void LoadAllModules(InspIRCd* ServerInstance)
 476 {
 477         char configToken[MAXBUF];
 478
 479         MODCOUNT = -1;
 480
 481         for (int count = 0; count < Config->ConfValueEnum("module",&Config->config_f); count++)
 482         {
 483                 Config->ConfValue("module","name",count,configToken,&Config->config_f);
 484                 printf("[\033[1;32m*\033[0m] Loading module:\t\033[1;32m%s\033[0m\n",configToken);
 485
 486                 if (!ServerInstance->LoadModule(configToken))
 487                 {
 488                         log(DEFAULT,"Exiting due to a module loader error.");
 489                         printf("\nThere was an error loading a module: %s\n\n",ServerInstance->ModuleError());
 490                         Exit(0);
 491                 }
 492         }
 493
 494         log(DEFAULT,"Total loaded modules: %lu",(unsigned long)MODCOUNT+1);
 495 }
 496
 497