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 #include "cull_list.h"
  62
  63 extern int MODCOUNT;
  64 extern struct sockaddr_in client,server;
  65 extern socklen_t length;
  66 extern std::vector<Module*> modules;
  67 extern std::vector<ircd_module*> factory;
  68 extern std::vector<InspSocket*> module_sockets;
  69 extern time_t TIME;
  70 extern time_t OLDTIME;
  71 extern std::vector<userrec*> local_users;
  72
  73 extern InspIRCd* ServerInstance;
  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 void ProcessUser(userrec* cu)
  82 {
  83         int result = EAGAIN;
  84         log(DEBUG,"Processing user with fd %d",cu->fd);
  85         if (Config->GetIOHook(cu->port))
  86         {
  87                 int result2 = 0;
  88                 int MOD_RESULT = Config->GetIOHook(cu->port)->OnRawSocketRead(cu->fd,data,65535,result2);
  89                 log(DEBUG,"Data result returned by module: %d",MOD_RESULT);
  90                 if (MOD_RESULT < 0)
  91                 {
  92                         result = EAGAIN;
  93                 }
  94                 else
  95                 {
  96                         result = result2;
  97                 }
  98         }
  99         else
 100         {
 101                 result = cu->ReadData(data, 65535);
 102         }
 103         log(DEBUG,"Read result: %d",result);
 104         if (result)
 105         {
 106                 ServerInstance->stats->statsRecv += result;
 107                 // perform a check on the raw buffer as an array (not a string!) to remove
 108                 // characters 0 and 7 which are illegal in the RFC - replace them with spaces.
 109                 // hopefully this should stop even more people whining about "Unknown command: *"
 110                 for (int checker = 0; checker < result; checker++)
 111                 {
 112                         if ((data[checker] == 0) || (data[checker] == 7))
 113                                 data[checker] = ' ';
 114                 }
 115                 if (result > 0)
 116                         data[result] = '\0';
 117                 userrec* current = cu;
 118                 int currfd = current->fd;
 119                 int floodlines = 0;
 120                 // add the data to the users buffer
 121                 if (result > 0)
 122                 {
 123                         if (!current->AddBuffer(data))
 124                         {
 125                                 // AddBuffer returned false, theres too much data in the user's buffer and theyre up to no good.
 126                                 if (current->registered == 7)
 127                                 {
 128                                         kill_link(current,"RecvQ exceeded");
 129                                 }
 130                                 else
 131                                 {
 132                                         WriteOpers("*** Excess flood from %s",current->ip);
 133                                         log(DEFAULT,"Excess flood from: %s",current->ip);
 134                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 135                                         apply_lines(APPLY_ZLINES);
 136                                 }
 137                                 return;
 138                         }
 139                         if (current->recvq.length() > (unsigned)Config->NetBufferSize)
 140                         {
 141                                 if (current->registered == 7)
 142                                 {
 143                                         kill_link(current,"RecvQ exceeded");
 144                                 }
 145                                 else
 146                                 {
 147                                         WriteOpers("*** Excess flood from %s",current->ip);
 148                                         log(DEFAULT,"Excess flood from: %s",current->ip);
 149                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 150                                         apply_lines(APPLY_ZLINES);
 151                                 }
 152                                 return;
 153                         }
 154                         // while there are complete lines to process...
 155                         while (current->BufferIsReady())
 156                         {
 157                                 floodlines++;
 158                                 if (TIME > current->reset_due)
 159                                 {
 160                                         current->reset_due = TIME + current->threshold;
 161                                         current->lines_in = 0;
 162                                 }
 163                                 current->lines_in++;
 164                                 if (current->lines_in > current->flood)
 165                                 {
 166                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 167                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 168                                         kill_link(current,"Excess flood");
 169                                         return;
 170                                 }
 171                                 if ((floodlines > current->flood) && (current->flood != 0))
 172                                 {
 173                                         if (current->registered == 7)
 174                                         {
 175                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 176                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 177                                                 kill_link(current,"Excess flood");
 178                                         }
 179                                         else
 180                                         {
 181                                                 add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 182                                                 apply_lines(APPLY_ZLINES);
 183                                         }
 184                                         return;
 185                                 }
 186                                 char sanitized[MAXBUF];
 187                                 // use GetBuffer to copy single lines into the sanitized string
 188                                 std::string single_line = current->GetBuffer();
 189                                 current->bytes_in += single_line.length();
 190                                 current->cmds_in++;
 191                                 if (single_line.length()>512)
 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                                 strlcpy(sanitized,single_line.c_str(),MAXBUF);
 199                                 if (*sanitized)
 200                                 {
 201                                         userrec* old_comp = fd_ref_table[currfd];
 202                                         // we're gonna re-scan to check if the nick is gone, after every
 203                                         // command - if it has, we're gonna bail
 204                                         ServerInstance->Parser->ProcessBuffer(sanitized,current);
 205                                         // look for the user's record in case it's changed... if theyve quit,
 206                                         // we cant do anything more with their buffer, so bail.
 207                                         // there used to be an ugly, slow loop here. Now we have a reference
 208                                         // table, life is much easier (and FASTER)
 209                                         userrec* new_comp = fd_ref_table[currfd];
 210                                         if ((currfd < 0) || (!fd_ref_table[currfd]) || (old_comp != new_comp))
 211                                         {
 212                                                 return;
 213                                         }
 214                                         else
 215                                         {
 216                                                 /* The user is still here, flush their buffer */
 217                                                 current->FlushWriteBuf();
 218                                         }
 219                                 }
 220                         }
 221                         return;
 222                 }
 223                 if ((result == -1) && (errno != EAGAIN) && (errno != EINTR))
 224                 {
 225                         log(DEBUG,"killing: %s",cu->nick);
 226                         kill_link(cu,strerror(errno));
 227                         return;
 228                 }
 229         }
 230         // result EAGAIN means nothing read
 231         else if (result == EAGAIN)
 232         {
 233         }
 234         else if (result == 0)
 235         {
 236                 log(DEBUG,"InspIRCd: Exited: %s",cu->nick);
 237                 kill_link(cu,"Client exited");
 238                 log(DEBUG,"Bailing from client exit");
 239                 return;
 240         }
 241 }
 242
 243 /**
 244  * This function is called once a second from the mainloop.
 245  * It is intended to do background checking on all the user structs, e.g.
 246  * stuff like ping checks, registration timeouts, etc.
 247  * The function returns false when it is finished, and true if
 248  * it needs to be run again (e.g. it has processed one of a batch of
 249  * QUIT messages, but couldnt continue iterating because the iterator
 250  * became invalid). This function is also responsible for checking
 251  * if InspSocket derived classes are timed out.
 252  */
 253 bool DoBackgroundUserStuff(time_t TIME)
 254 {
 255         unsigned int numsockets = module_sockets.size();
 256         SocketEngine* SE = ServerInstance->SE;
 257         for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 258         {
 259                 InspSocket* s = (InspSocket*)*a;
 260                 if (s->Timeout(TIME))
 261                 {
 262                         log(DEBUG,"Socket poll returned false, close and bail");
 263                         SE->DelFd(s->GetFd());
 264                         s->Close();
 265                         module_sockets.erase(a);
 266                         delete s;
 267                         break;
 268                 }
 269                 if (module_sockets.size() != numsockets) break;
 270         }
 271         CullList* GlobalGoners = new CullList();
 272         for (std::vector<userrec*>::iterator count2 = local_users.begin(); count2 != local_users.end(); count2++)
 273         {
 274                 /* Sanity checks for corrupted iterators (yes, really) */
 275                 userrec* curr = NULL;
 276                 if (*count2)
 277                         curr = (userrec*)(*count2);
 278                 if ((long)curr == -1)
 279                         return false;
 280
 281                 if (curr)
 282                 {
 283                         // registration timeout -- didnt send USER/NICK/HOST in the time specified in
 284                         // their connection class.
 285                         if (((unsigned)TIME > (unsigned)curr->timeout) && (curr->registered != 7))
 286                         {
 287                                 log(DEBUG,"InspIRCd: registration timeout: %s",curr->nick);
 288                                 GlobalGoners->AddItem(curr,"Registration timeout");
 289                                 continue;
 290                         }
 291                         // user has signed on with USER/NICK/PASS, and dns has completed, all the modules
 292                         // say this user is ok to proceed, fully connect them.
 293                         if ((TIME > curr->signon) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 294                         {
 295                                 curr->dns_done = true;
 296                                 ServerInstance->stats->statsDnsBad++;
 297                                 FullConnectUser(curr,GlobalGoners);
 298                                 continue;
 299                         }
 300                         if ((curr->dns_done) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 301                         {
 302                                 log(DEBUG,"dns done, registered=3, and modules ready, OK");
 303                                 FullConnectUser(curr,GlobalGoners);
 304                                 continue;
 305                         }
 306                         // It's time to PING this user. Send them a ping.
 307                         // XXX: We were checking isnick() here -- why when we check curr->registered? - Brain
 308                         if ((TIME > curr->nping) && (curr->registered == 7))
 309                         {
 310                                 // This user didn't answer the last ping, remove them
 311                                 if (!curr->lastping)
 312                                 {
 313                                         GlobalGoners->AddItem(curr,"Ping timeout");
 314                                         continue;
 315                                 }
 316                                 Write(curr->fd,"PING :%s",Config->ServerName);
 317                                 curr->lastping = 0;
 318                                 curr->nping = TIME+curr->pingmax;
 319                         }
 320                         // XXX: We can flush the write buffer as the last thing we do, because if they
 321                         // match any of the above conditions its no use flushing their buffer anyway.
 322                         curr->FlushWriteBuf();
 323                         if (curr->GetWriteError() != "")
 324                         {
 325                                 GlobalGoners->AddItem(curr,curr->GetWriteError());
 326                                 continue;
 327                         }
 328                 }
 329         }
 330         /** Remove all the queued users who are due to be quit
 331          */
 332         GlobalGoners->Apply();
 333         /** Free to memory used
 334          */
 335         delete GlobalGoners;
 336         /** XXX: The old system prior to 1.0RC2 would call this function
 337          * repeatedly until everything was ship-shape, however now we are
 338          * using CullList to avoid bailing from the loop, so this is no
 339          * longer required. We always return false here so this only executes
 340          * once. At some future date the while loop may be removed from
 341          * the mainloop which calls this function.
 342          */
 343         return false;
 344 }
 345
 346 void OpenLog(char** argv, int argc)
 347 {
 348         std::string logpath = GetFullProgDir(argv,argc) + "/ircd.log";
 349         Config->log_file = fopen(logpath.c_str(),"a+");
 350         if (!Config->log_file)
 351         {
 352                 printf("ERROR: Could not write to logfile %s, bailing!\n\n",logpath.c_str());
 353                 Exit(ERROR);
 354         }
 355 #ifdef IS_CYGWIN
 356         printf("Logging to ircd.log...\n");
 357 #else
 358         printf("Logging to %s...\n",logpath.c_str());
 359 #endif
 360 }
 361
 362
 363 void CheckRoot()
 364 {
 365         if (geteuid() == 0)
 366         {
 367                 printf("WARNING!!! You are running an irc server as ROOT!!! DO NOT DO THIS!!!\n\n");
 368                 log(DEFAULT,"InspIRCd: startup: not starting with UID 0!");
 369                 Exit(ERROR);
 370         }
 371 }
 372
 373
 374 void CheckDie()
 375 {
 376         if (*Config->DieValue)
 377         {
 378                 printf("WARNING: %s\n\n",Config->DieValue);
 379                 log(DEFAULT,"Ut-Oh, somebody didn't read their config file: '%s'",Config->DieValue);
 380                 exit(0);
 381         }
 382 }
 383
 384 void LoadAllModules(InspIRCd* ServerInstance)
 385 {
 386         /* We must load the modules AFTER initializing the socket engine, now */
 387         MODCOUNT = -1;
 388         char configToken[MAXBUF];
 389         for (int count = 0; count < Config->ConfValueEnum("module",&Config->config_f); count++)
 390         {
 391                 Config->ConfValue("module","name",count,configToken,&Config->config_f);
 392                 printf("Loading module... \033[1;32m%s\033[0m\n",configToken);
 393                 if (!ServerInstance->LoadModule(configToken))
 394                 {
 395                         log(DEFAULT,"Exiting due to a module loader error.");
 396                         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());
 397                         Exit(0);
 398                 }
 399         }
 400         log(DEFAULT,"Total loaded modules: %lu",(unsigned long)MODCOUNT+1);
 401 }
 402
 403