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 extern InspSocket* socket_ref[MAX_DESCRIPTORS];
  74 char LOG_FILE[MAXBUF];
  75
  76 extern InspIRCd* ServerInstance;
  77 extern ServerConfig *Config;
  78 extern userrec* fd_ref_table[MAX_DESCRIPTORS];
  79 char data[65536];
  80
  81 extern user_hash clientlist;
  82 extern chan_hash chanlist;
  83
  84 void ProcessUser(userrec* cu)
  85 {
  86         int result = EAGAIN;
  87
  88         if (cu->fd == FD_MAGIC_NUMBER)
  89                 return;
  90
  91         log(DEBUG,"Processing user with fd %d",cu->fd);
  92
  93         if (Config->GetIOHook(cu->port))
  94         {
  95                 int result2 = 0;
  96                 int MOD_RESULT = 0;
  97
  98                 try
  99                 {
 100                         MOD_RESULT = Config->GetIOHook(cu->port)->OnRawSocketRead(cu->fd,data,65535,result2);
 101                         log(DEBUG,"Data result returned by module: %d",MOD_RESULT);
 102                 }
 103                 catch (ModuleException& modexcept)
 104                 {
 105                         log(DEBUG,"Module exception caught: %s",modexcept.GetReason());
 106                 }
 107
 108                 if (MOD_RESULT < 0)
 109                 {
 110                         result = -EAGAIN;
 111                 }
 112                 else
 113                 {
 114                         result = result2;
 115                 }
 116         }
 117         else
 118         {
 119                 result = cu->ReadData(data, 65535);
 120         }
 121
 122         log(DEBUG,"Read result: %d",result);
 123
 124         if ((result) && (result != -EAGAIN))
 125         {
 126                 userrec *current;
 127                 int currfd;
 128                 int floodlines;
 129
 130                 ServerInstance->stats->statsRecv += result;
 131                 /*
 132                  * perform a check on the raw buffer as an array (not a string!) to remove
 133                  * characters 0 and 7 which are illegal in the RFC - replace them with spaces.
 134                  * hopefully this should stop even more people whining about "Unknown command: *"
 135                  */
 136
 137                 /*
 138                  * XXX - potential replacement for the below using my beloved pointers. --w00t
 139                  * XXX - no garauntee there's not \0's in the middle of the data,
 140                  *       and no reason for it to be terminated either. -- Om
 141                  *
 142                  * for (char *c = data; data && *data; data++)
 143                  * {
 144                  *      if (*data == 0 || *data == 7)
 145                  *              data = ' ';
 146                  * }
 147                  */
 148
 149                 for (int checker = 0; checker < result; checker++)
 150                 {
 151                         if ((data[checker] == 0) || (data[checker] == 7))
 152                                 data[checker] = ' ';
 153                 }
 154
 155                 if (result > 0)
 156                         data[result] = '\0';
 157
 158                 current = cu;
 159                 currfd = current->fd;
 160                 floodlines = 0;
 161
 162                 // add the data to the users buffer
 163                 if (result > 0)
 164                 {
 165                         if (!current->AddBuffer(data))
 166                         {
 167                                 // AddBuffer returned false, theres too much data in the user's buffer and theyre up to no good.
 168                                 if (current->registered == 7)
 169                                 {
 170                                         // Make sure they arn't flooding long lines.
 171                                         if (TIME > current->reset_due)
 172                                         {
 173                                                 current->reset_due = TIME + current->threshold;
 174                                                 current->lines_in = 0;
 175                                         }
 176
 177                                         current->lines_in++;
 178
 179                                         if (current->lines_in > current->flood)
 180                                         {
 181                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 182                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 183                                                 kill_link(current,"Excess flood");
 184                                                 return;
 185                                         }
 186                                         else
 187                                         {
 188                                                 WriteServ(currfd, "NOTICE %s :Your previous line was too long and was not delivered (Over 512chars) Please shorten it.", current->nick);
 189                                                 current->recvq = "";
 190                                         }
 191                                 }
 192                                 else
 193                                 {
 194                                         WriteOpers("*** Excess flood from %s",(char*)inet_ntoa(current->ip4));
 195                                         log(DEFAULT,"Excess flood from: %s",(char*)inet_ntoa(current->ip4));
 196                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 197                                         apply_lines(APPLY_ZLINES);
 198                                 }
 199
 200                                 return;
 201                         }
 202
 203                         if (current->recvq.length() > (unsigned)Config->NetBufferSize)
 204                         {
 205                                 if (current->registered == 7)
 206                                 {
 207                                         kill_link(current,"RecvQ exceeded");
 208                                 }
 209                                 else
 210                                 {
 211                                         WriteOpers("*** Excess flood from %s",(char*)inet_ntoa(current->ip4));
 212                                         log(DEFAULT,"Excess flood from: %s",(char*)inet_ntoa(current->ip4));
 213                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 214                                         apply_lines(APPLY_ZLINES);
 215                                 }
 216
 217                                 return;
 218                         }
 219
 220                         // while there are complete lines to process...
 221                         while (current->BufferIsReady())
 222                         {
 223                                 char sanitized[MAXBUF];
 224
 225                                 floodlines++;
 226                                 if (TIME > current->reset_due)
 227                                 {
 228                                         current->reset_due = TIME + current->threshold;
 229                                         current->lines_in = 0;
 230                                 }
 231
 232                                 current->lines_in++;
 233
 234                                 if (current->lines_in > current->flood)
 235                                 {
 236                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 237                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 238                                         kill_link(current,"Excess flood");
 239                                         return;
 240                                 }
 241
 242                                 if ((floodlines > current->flood) && (current->flood != 0))
 243                                 {
 244                                         if (current->registered == 7)
 245                                         {
 246                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 247                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 248                                                 kill_link(current,"Excess flood");
 249                                         }
 250                                         else
 251                                         {
 252                                                 add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 253                                                 apply_lines(APPLY_ZLINES);
 254                                         }
 255
 256                                         return;
 257                                 }
 258
 259                                 // use GetBuffer to copy single lines into the sanitized string
 260                                 std::string single_line = current->GetBuffer();
 261                                 current->bytes_in += single_line.length();
 262                                 current->cmds_in++;
 263                                 strlcpy(sanitized,single_line.c_str(),511);
 264
 265                                 if (*sanitized)
 266                                 {
 267                                         userrec* old_comp = fd_ref_table[currfd];
 268
 269                                         ServerInstance->Parser->ProcessBuffer(sanitized,current);
 270                                         /*
 271                                          * look for the user's record in case it's changed... if theyve quit,
 272                                          * we cant do anything more with their buffer, so bail.
 273                                          * there used to be an ugly, slow loop here. Now we have a reference
 274                                          * table, life is much easier (and FASTER)
 275                                          */
 276                                         userrec* new_comp = fd_ref_table[currfd];
 277                                         if ((currfd < 0) || (!fd_ref_table[currfd]) || (old_comp != new_comp))
 278                                         {
 279                                                 return;
 280                                         }
 281                                         else
 282                                         {
 283                                                 /* The user is still here, flush their buffer */
 284                                                 current->FlushWriteBuf();
 285                                         }
 286                                 }
 287                         }
 288
 289                         return;
 290                 }
 291
 292                 if ((result == -1) && (errno != EAGAIN) && (errno != EINTR))
 293                 {
 294                         log(DEBUG,"killing: %s",cu->nick);
 295                         kill_link(cu,strerror(errno));
 296                         return;
 297                 }
 298         }
 299
 300         // result EAGAIN means nothing read
 301         else if ((result == EAGAIN) || (result == -EAGAIN))
 302         {
 303                 /* do nothing */
 304         }
 305         else if (result == 0)
 306         {
 307                 log(DEBUG,"InspIRCd: Exited: %s",cu->nick);
 308                 kill_link(cu,"Client exited");
 309                 log(DEBUG,"Bailing from client exit");
 310                 return;
 311         }
 312 }
 313
 314 void DoSocketTimeouts(time_t TIME)
 315 {
 316         unsigned int numsockets = module_sockets.size();
 317         SocketEngine* SE = ServerInstance->SE;
 318
 319         for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 320         {
 321                 InspSocket* s = (InspSocket*)*a;
 322                 if ((s) && (s->GetFd() >= 0) && (s->GetFd() < MAX_DESCRIPTORS) && (socket_ref[s->GetFd()] != NULL) && (s->Timeout(TIME)))
 323                 {
 324                         log(DEBUG,"userprocess.cpp: Socket poll returned false, close and bail");
 325                         socket_ref[s->GetFd()] = NULL;
 326                         SE->DelFd(s->GetFd());
 327                         module_sockets.erase(a);
 328                         s->Close();
 329                         delete s;
 330                         break;
 331                 }
 332
 333                 if (module_sockets.size() != numsockets)
 334                         break;
 335         }
 336 }
 337
 338 /**
 339  * This function is called once a second from the mainloop.
 340  * It is intended to do background checking on all the user structs, e.g.
 341  * stuff like ping checks, registration timeouts, etc. This function is
 342  * also responsible for checking if InspSocket derived classes are timed out.
 343  */
 344 void DoBackgroundUserStuff(time_t TIME)
 345 {
 346         CullList GlobalGoners;
 347
 348         for (std::vector<userrec*>::iterator count2 = local_users.begin(); count2 != local_users.end(); count2++)
 349         {
 350                 /* Sanity checks for corrupted iterators (yes, really) */
 351                 userrec* curr = NULL;
 352
 353                 if (*count2)
 354                         curr = (userrec*)(*count2);
 355                 if ((long)curr == -1)
 356                         return;
 357
 358                 if (curr)
 359                 {
 360                         /*
 361                          * registration timeout -- didnt send USER/NICK/HOST
 362                          * in the time specified in their connection class.
 363                          */
 364                         if (((unsigned)TIME > (unsigned)curr->timeout) && (curr->registered != 7))
 365                         {
 366                                 log(DEBUG,"InspIRCd: registration timeout: %s",curr->nick);
 367                                 GlobalGoners.AddItem(curr,"Registration timeout");
 368                                 continue;
 369                         }
 370
 371                         /*
 372                          * user has signed on with USER/NICK/PASS, and dns has completed, all the modules
 373                          * say this user is ok to proceed, fully connect them.
 374                          */
 375                         if ((TIME > curr->signon) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 376                         {
 377                                 curr->dns_done = true;
 378                                 ServerInstance->stats->statsDnsBad++;
 379                                 FullConnectUser(curr,&GlobalGoners);
 380                                 continue;
 381                         }
 382
 383                         if ((curr->dns_done) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 384                         {
 385                                 log(DEBUG,"dns done, registered=3, and modules ready, OK");
 386                                 FullConnectUser(curr,&GlobalGoners);
 387                                 continue;
 388                         }
 389
 390                         // It's time to PING this user. Send them a ping.
 391                         if ((TIME > curr->nping) && (curr->registered == 7))
 392                         {
 393                                 // This user didn't answer the last ping, remove them
 394                                 if (!curr->lastping)
 395                                 {
 396                                         GlobalGoners.AddItem(curr,"Ping timeout");
 397                                         continue;
 398                                 }
 399
 400                                 Write(curr->fd,"PING :%s",Config->ServerName);
 401                                 curr->lastping = 0;
 402                                 curr->nping = TIME+curr->pingmax;
 403                         }
 404
 405                         /*
 406                          * We can flush the write buffer as the last thing we do, because if they
 407                          * match any of the above conditions its no use flushing their buffer anyway.
 408                          */
 409                         curr->FlushWriteBuf();
 410
 411                         if (*curr->GetWriteError())
 412                         {
 413                                 GlobalGoners.AddItem(curr,curr->GetWriteError());
 414                                 continue;
 415                         }
 416                 }
 417         }
 418
 419         /* Remove all the queued users who are due to be quit, free memory used. */
 420         GlobalGoners.Apply();
 421 }
 422
 423 void OpenLog(char** argv, int argc)
 424 {
 425         if (!*LOG_FILE)
 426         {
 427                 if (Config->logpath == "")
 428                 {
 429                         Config->logpath = GetFullProgDir(argv,argc) + "/ircd.log";
 430                 }
 431         }
 432         else
 433         {
 434                 Config->log_file = fopen(LOG_FILE,"a+");
 435
 436                 if (!Config->log_file)
 437                 {
 438                         printf("ERROR: Could not write to logfile %s, bailing!\n\n",Config->logpath.c_str());
 439                         Exit(ERROR);
 440                 }
 441
 442                 return;
 443         }
 444
 445         Config->log_file = fopen(Config->logpath.c_str(),"a+");
 446
 447         if (!Config->log_file)
 448         {
 449                 printf("ERROR: Could not write to logfile %s, bailing!\n\n",Config->logpath.c_str());
 450                 Exit(ERROR);
 451         }
 452 }
 453
 454
 455 void CheckRoot()
 456 {
 457         if (geteuid() == 0)
 458         {
 459                 printf("WARNING!!! You are running an irc server as ROOT!!! DO NOT DO THIS!!!\n\n");
 460                 log(DEFAULT,"InspIRCd: startup: not starting with UID 0!");
 461                 Exit(ERROR);
 462         }
 463 }
 464
 465
 466 void CheckDie()
 467 {
 468         if (*Config->DieValue)
 469         {
 470                 printf("WARNING: %s\n\n",Config->DieValue);
 471                 log(DEFAULT,"Uh-Oh, somebody didn't read their config file: '%s'",Config->DieValue);
 472                 Exit(ERROR);
 473         }
 474 }
 475
 476 /* We must load the modules AFTER initializing the socket engine, now */
 477 void LoadAllModules(InspIRCd* ServerInstance)
 478 {
 479         char configToken[MAXBUF];
 480         Config->module_names.clear();
 481
 482         MODCOUNT = -1;
 483
 484         for (int count = 0; count < Config->ConfValueEnum("module",&Config->config_f); count++)
 485         {
 486                 Config->ConfValue("module","name",count,configToken,&Config->config_f);
 487                 printf("[\033[1;32m*\033[0m] Loading module:\t\033[1;32m%s\033[0m\n",configToken);
 488
 489                 if (!ServerInstance->LoadModule(configToken))
 490                 {
 491                         log(DEFAULT,"Exiting due to a module loader error.");
 492                         printf("\nThere was an error loading a module: %s\n\n",ServerInstance->ModuleError());
 493                         Exit(0);
 494                 }
 495         }
 496
 497         log(DEFAULT,"Total loaded modules: %lu",(unsigned long)MODCOUNT+1);
 498 }