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