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