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