src/userprocess.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  Inspire is copyright (C) 2002-2005 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 "typedefs.h"
  60 #include "command_parse.h"
  61
  62 extern int MODCOUNT;
  63 extern struct sockaddr_in client,server;
  64 extern socklen_t length;
  65 extern std::vector<Module*> modules;
  66 extern std::vector<ircd_module*> factory;
  67 extern std::vector<InspSocket*> module_sockets;
  68 extern time_t TIME;
  69 extern time_t OLDTIME;
  70 extern std::vector<userrec*> local_users;
  71
  72 extern InspIRCd* ServerInstance;
  73 extern serverstats* stats;
  74 extern ServerConfig *Config;
  75 extern userrec* fd_ref_table[65536];
  76 char data[65536];
  77
  78 extern user_hash clientlist;
  79 extern chan_hash chanlist;
  80
  81 extern Module* IOHookModule;
  82
  83 void ProcessUser(userrec* cu)
  84 {
  85         int result = EAGAIN;
  86         log(DEBUG,"Processing user with fd %d",cu->fd);
  87         if (IOHookModule)
  88         {
  89                 int MOD_RESULT = 0;
  90                 int result2 = 0;
  91                 IOHookModule->OnRawSocketRead(cu->fd,data,65535,result2);
  92                 if (!MOD_RESULT)
  93                 {
  94                         result = cu->ReadData(data, 65535);
  95                 }
  96                 else
  97                 {
  98                         log(DEBUG,"Data result returned by module: %d",MOD_RESULT);
  99                         result = result2;
 100                 }
 101         }
 102         else
 103         {
 104                 result = cu->ReadData(data, 65535);
 105         }
 106         log(DEBUG,"Read result: %d",result);
 107         if (result)
 108         {
 109                 stats->statsRecv += result;
 110                 // perform a check on the raw buffer as an array (not a string!) to remove
 111                 // characters 0 and 7 which are illegal in the RFC - replace them with spaces.
 112                 // hopefully this should stop even more people whining about "Unknown command: *"
 113                 for (int checker = 0; checker < result; checker++)
 114                 {
 115                         if ((data[checker] == 0) || (data[checker] == 7))
 116                                 data[checker] = ' ';
 117                 }
 118                 if (result > 0)
 119                         data[result] = '\0';
 120                 userrec* current = cu;
 121                 int currfd = current->fd;
 122                 int floodlines = 0;
 123                 // add the data to the users buffer
 124                 if (result > 0)
 125                 {
 126                         if (!current->AddBuffer(data))
 127                         {
 128                                 // AddBuffer returned false, theres too much data in the user's buffer and theyre up to no good.
 129                                 if (current->registered == 7)
 130                                 {
 131                                         kill_link(current,"RecvQ exceeded");
 132                                 }
 133                                 else
 134                                 {
 135                                         WriteOpers("*** Excess flood from %s",current->ip);
 136                                         log(DEFAULT,"Excess flood from: %s",current->ip);
 137                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 138                                         apply_lines(APPLY_ZLINES);
 139                                 }
 140                                 return;
 141                         }
 142                         if (current->recvq.length() > (unsigned)Config->NetBufferSize)
 143                         {
 144                                 if (current->registered == 7)
 145                                 {
 146                                         kill_link(current,"RecvQ exceeded");
 147                                 }
 148                                 else
 149                                 {
 150                                         WriteOpers("*** Excess flood from %s",current->ip);
 151                                         log(DEFAULT,"Excess flood from: %s",current->ip);
 152                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 153                                         apply_lines(APPLY_ZLINES);
 154                                 }
 155                                 return;
 156                         }
 157                         // while there are complete lines to process...
 158                         while (current->BufferIsReady())
 159                         {
 160                                 floodlines++;
 161                                 if (TIME > current->reset_due)
 162                                 {
 163                                         current->reset_due = TIME + current->threshold;
 164                                         current->lines_in = 0;
 165                                 }
 166                                 current->lines_in++;
 167                                 if (current->lines_in > current->flood)
 168                                 {
 169                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 170                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 171                                         kill_link(current,"Excess flood");
 172                                         return;
 173                                 }
 174                                 if ((floodlines > current->flood) && (current->flood != 0))
 175                                 {
 176                                         if (current->registered == 7)
 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                                         }
 182                                         else
 183                                         {
 184                                                 add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 185                                                 apply_lines(APPLY_ZLINES);
 186                                         }
 187                                         return;
 188                                 }
 189                                 char sanitized[MAXBUF];
 190                                 // use GetBuffer to copy single lines into the sanitized string
 191                                 std::string single_line = current->GetBuffer();
 192                                 current->bytes_in += single_line.length();
 193                                 current->cmds_in++;
 194                                 if (single_line.length()>512)
 195                                 {
 196                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 197                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 198                                         kill_link(current,"Excess flood");
 199                                         return;
 200                                 }
 201                                 strlcpy(sanitized,single_line.c_str(),MAXBUF);
 202                                 if (*sanitized)
 203                                 {
 204                                         userrec* old_comp = fd_ref_table[currfd];
 205                                         // we're gonna re-scan to check if the nick is gone, after every
 206                                         // command - if it has, we're gonna bail
 207                                         ServerInstance->Parser->ProcessBuffer(sanitized,current);
 208                                         // look for the user's record in case it's changed... if theyve quit,
 209                                         // we cant do anything more with their buffer, so bail.
 210                                         // there used to be an ugly, slow loop here. Now we have a reference
 211                                         // table, life is much easier (and FASTER)
 212                                         userrec* new_comp = fd_ref_table[currfd];
 213                                         if ((currfd < 0) || (!fd_ref_table[currfd]) || (old_comp != new_comp))
 214                                         {
 215                                                 return;
 216                                         }
 217                                         else
 218                                         {
 219                                                 /* The user is still here, flush their buffer */
 220                                                 current->FlushWriteBuf();
 221                                         }
 222                                 }
 223                         }
 224                         return;
 225                 }
 226                 if ((result == -1) && (errno != EAGAIN) && (errno != EINTR))
 227                 {
 228                         log(DEBUG,"killing: %s",cu->nick);
 229                         kill_link(cu,strerror(errno));
 230                         return;
 231                 }
 232         }
 233         // result EAGAIN means nothing read
 234         else if (result == EAGAIN)
 235         {
 236         }
 237         else if (result == 0)
 238         {
 239                 log(DEBUG,"InspIRCd: Exited: %s",cu->nick);
 240                 kill_link(cu,"Client exited");
 241                 log(DEBUG,"Bailing from client exit");
 242                 return;
 243         }
 244 }
 245
 246
 247 /**
 248  * This function is called once a second from the mainloop.
 249  * It is intended to do background checking on all the user structs, e.g.
 250  * stuff like ping checks, registration timeouts, etc.
 251  * The function returns false when it is finished, and true if
 252  * it needs to be run again (e.g. it has processed one of a batch of
 253  * QUIT messages, but couldnt continue iterating because the iterator
 254  * became invalid). This function is also responsible for checking
 255  * if InspSocket derived classes are timed out.
 256  */
 257 bool DoBackgroundUserStuff(time_t TIME)
 258 {
 259         unsigned int numsockets = module_sockets.size();
 260         SocketEngine* SE = ServerInstance->SE;
 261         for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 262         {
 263                 InspSocket* s = (InspSocket*)*a;
 264                 if (s->Timeout(TIME))
 265                 {
 266                         log(DEBUG,"Socket poll returned false, close and bail");
 267                         SE->DelFd(s->GetFd());
 268                         s->Close();
 269                         module_sockets.erase(a);
 270                         delete s;
 271                         break;
 272                 }
 273                 if (module_sockets.size() != numsockets) break;
 274         }
 275         /* TODO: We need a seperate hash containing only local users for this
 276          */
 277         for (std::vector<userrec*>::iterator count2 = local_users.begin(); count2 != local_users.end(); count2++)
 278         {
 279                 /* Sanity checks for corrupted iterators (yes, really) */
 280                 userrec* curr = NULL;
 281                 if (*count2)
 282                         curr = (userrec*)(*count2);
 283                 if ((long)curr == -1)
 284                         return false;
 285
 286                 if ((curr) && (curr->fd != 0)) /* XXX - why are we checking fd != 0? --w00t */
 287                 {
 288                         int currfd = curr->fd;
 289                         // we don't check the state of remote users.
 290                         if (IS_LOCAL(curr))
 291                         {
 292                                 curr->FlushWriteBuf();
 293                                 if (curr->GetWriteError() != "")
 294                                 {
 295                                         log(DEBUG,"InspIRCd: write error: %s",curr->GetWriteError().c_str());
 296                                         kill_link(curr,curr->GetWriteError().c_str());
 297                                         return true;
 298                                 }
 299                                 // registration timeout -- didnt send USER/NICK/HOST in the time specified in
 300                                 // their connection class.
 301                                 if (((unsigned)TIME > (unsigned)curr->timeout) && (curr->registered != 7))
 302                                 {
 303                                         log(DEBUG,"InspIRCd: registration timeout: %s",curr->nick);
 304                                         kill_link(curr,"Registration timeout");
 305                                         return true;
 306                                 }
 307                                 if ((TIME > curr->signon) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 308                                 {
 309                                         log(DEBUG,"signon exceed, registered=3, and modules ready, OK: %d %d",TIME,curr->signon);
 310                                         curr->dns_done = true;
 311                                         stats->statsDnsBad++;
 312                                         FullConnectUser(curr);
 313                                         if (fd_ref_table[currfd] != curr) // something changed, bail pronto
 314                                                 return true;
 315                                  }
 316                                  if ((curr->dns_done) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 317                                  {
 318                                        log(DEBUG,"dns done, registered=3, and modules ready, OK");
 319                                        FullConnectUser(curr);
 320                                        if (fd_ref_table[currfd] != curr) // something changed, bail pronto
 321                                                 return true;
 322                                  }
 323                                  if ((TIME > curr->nping) && (isnick(curr->nick)) && (curr->registered == 7))
 324                                  {
 325                                        if ((!curr->lastping) && (curr->registered == 7))
 326                                        {
 327                                                log(DEBUG,"InspIRCd: ping timeout: %s",curr->nick);
 328                                                kill_link(curr,"Ping timeout");
 329                                                return true;
 330                                        }
 331                                        Write(curr->fd,"PING :%s",Config->ServerName);
 332                                        log(DEBUG,"InspIRCd: pinging: %s",curr->nick);
 333                                        curr->lastping = 0;
 334                                        curr->nping = TIME+curr->pingmax;       // was hard coded to 120
 335                                 }
 336                         }
 337                 }
 338         }
 339         return false;
 340 }
 341
 342 void OpenLog(char** argv, int argc)
 343 {
 344         std::string logpath = GetFullProgDir(argv,argc) + "/ircd.log";
 345         Config->log_file = fopen(logpath.c_str(),"a+");
 346         if (!Config->log_file)
 347         {
 348                 printf("ERROR: Could not write to logfile %s, bailing!\n\n",logpath.c_str());
 349                 Exit(ERROR);
 350         }
 351 #ifdef IS_CYGWIN
 352         printf("Logging to ircd.log...\n");
 353 #else
 354         printf("Logging to %s...\n",logpath.c_str());
 355 #endif
 356 }
 357
 358
 359 void CheckRoot()
 360 {
 361         if (geteuid() == 0)
 362         {
 363                 printf("WARNING!!! You are running an irc server as ROOT!!! DO NOT DO THIS!!!\n\n");
 364                 log(DEFAULT,"InspIRCd: startup: not starting with UID 0!");
 365                 Exit(ERROR);
 366         }
 367 }
 368
 369
 370 void CheckDie()
 371 {
 372         if (*Config->DieValue)
 373         {
 374                 printf("WARNING: %s\n\n",Config->DieValue);
 375                 log(DEFAULT,"Ut-Oh, somebody didn't read their config file: '%s'",Config->DieValue);
 376                 exit(0);
 377         }
 378 }
 379
 380 void LoadAllModules()
 381 {
 382         /* We must load the modules AFTER initializing the socket engine, now */
 383         MODCOUNT = -1;
 384         char configToken[MAXBUF];
 385         for (int count = 0; count < Config->ConfValueEnum("module",&Config->config_f); count++)
 386         {
 387                 Config->ConfValue("module","name",count,configToken,&Config->config_f);
 388                 printf("Loading module... \033[1;32m%s\033[0m\n",configToken);
 389                 if (!ServerInstance->LoadModule(configToken))
 390                 {
 391                         log(DEFAULT,"Exiting due to a module loader error.");
 392                         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());
 393                         Exit(0);
 394                 }
 395         }
 396         log(DEFAULT,"Total loaded modules: %lu",(unsigned long)MODCOUNT+1);
 397 }
 398
 399