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 SocketEngine* SE;
  74 extern serverstats* stats;
  75 extern ServerConfig *Config;
  76 extern CommandParser *Parser;
  77
  78 extern userrec* fd_ref_table[65536];
  79 char data[65536];
  80
  81 extern user_hash clientlist;
  82 extern chan_hash chanlist;
  83
  84 extern Module* IOHookModule;
  85
  86 void ProcessUser(userrec* cu)
  87 {
  88         int result = EAGAIN;
  89         log(DEBUG,"Processing user with fd %d",cu->fd);
  90         if (IOHookModule)
  91         {
  92                 int MOD_RESULT = 0;
  93                 int result2 = 0;
  94                 IOHookModule->OnRawSocketRead(cu->fd,data,65535,result2);
  95                 if (!MOD_RESULT)
  96                 {
  97                         result = cu->ReadData(data, 65535);
  98                 }
  99                 else
 100                 {
 101                         log(DEBUG,"Data result returned by module: %d",MOD_RESULT);
 102                         result = result2;
 103                 }
 104         }
 105         else
 106         {
 107                 result = cu->ReadData(data, 65535);
 108         }
 109         log(DEBUG,"Read result: %d",result);
 110         if (result)
 111         {
 112                 stats->statsRecv += result;
 113                 // perform a check on the raw buffer as an array (not a string!) to remove
 114                 // characters 0 and 7 which are illegal in the RFC - replace them with spaces.
 115                 // hopefully this should stop even more people whining about "Unknown command: *"
 116                 for (int checker = 0; checker < result; checker++)
 117                 {
 118                         if ((data[checker] == 0) || (data[checker] == 7))
 119                                 data[checker] = ' ';
 120                 }
 121                 if (result > 0)
 122                         data[result] = '\0';
 123                 userrec* current = cu;
 124                 int currfd = current->fd;
 125                 int floodlines = 0;
 126                 // add the data to the users buffer
 127                 if (result > 0)
 128                 {
 129                         if (!current->AddBuffer(data))
 130                         {
 131                                 // AddBuffer returned false, theres too much data in the user's buffer and theyre up to no good.
 132                                 if (current->registered == 7)
 133                                 {
 134                                         kill_link(current,"RecvQ exceeded");
 135                                 }
 136                                 else
 137                                 {
 138                                         WriteOpers("*** Excess flood from %s",current->ip);
 139                                         log(DEFAULT,"Excess flood from: %s",current->ip);
 140                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 141                                         apply_lines(APPLY_ZLINES);
 142                                 }
 143                                 return;
 144                         }
 145                         if (current->recvq.length() > (unsigned)Config->NetBufferSize)
 146                         {
 147                                 if (current->registered == 7)
 148                                 {
 149                                         kill_link(current,"RecvQ exceeded");
 150                                 }
 151                                 else
 152                                 {
 153                                         WriteOpers("*** Excess flood from %s",current->ip);
 154                                         log(DEFAULT,"Excess flood from: %s",current->ip);
 155                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 156                                         apply_lines(APPLY_ZLINES);
 157                                 }
 158                                 return;
 159                         }
 160                         // while there are complete lines to process...
 161                         while (current->BufferIsReady())
 162                         {
 163                                 floodlines++;
 164                                 if (TIME > current->reset_due)
 165                                 {
 166                                         current->reset_due = TIME + current->threshold;
 167                                         current->lines_in = 0;
 168                                 }
 169                                 current->lines_in++;
 170                                 if (current->lines_in > current->flood)
 171                                 {
 172                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 173                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 174                                         kill_link(current,"Excess flood");
 175                                         return;
 176                                 }
 177                                 if ((floodlines > current->flood) && (current->flood != 0))
 178                                 {
 179                                         if (current->registered == 7)
 180                                         {
 181                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 182                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 183                                                 kill_link(current,"Excess flood");
 184                                         }
 185                                         else
 186                                         {
 187                                                 add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 188                                                 apply_lines(APPLY_ZLINES);
 189                                         }
 190                                         return;
 191                                 }
 192                                 char sanitized[MAXBUF];
 193                                 // use GetBuffer to copy single lines into the sanitized string
 194                                 std::string single_line = current->GetBuffer();
 195                                 current->bytes_in += single_line.length();
 196                                 current->cmds_in++;
 197                                 if (single_line.length()>512)
 198                                 {
 199                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 200                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 201                                         kill_link(current,"Excess flood");
 202                                         return;
 203                                 }
 204                                 strlcpy(sanitized,single_line.c_str(),MAXBUF);
 205                                 if (*sanitized)
 206                                 {
 207                                         userrec* old_comp = fd_ref_table[currfd];
 208                                         // we're gonna re-scan to check if the nick is gone, after every
 209                                         // command - if it has, we're gonna bail
 210                                         Parser->ProcessBuffer(sanitized,current);
 211                                         // look for the user's record in case it's changed... if theyve quit,
 212                                         // we cant do anything more with their buffer, so bail.
 213                                         // there used to be an ugly, slow loop here. Now we have a reference
 214                                         // table, life is much easier (and FASTER)
 215                                         userrec* new_comp = fd_ref_table[currfd];
 216                                         if ((currfd < 0) || (!fd_ref_table[currfd]) || (old_comp != new_comp))
 217                                         {
 218                                                 return;
 219                                         }
 220                                         else
 221                                         {
 222                                                 /* The user is still here, flush their buffer */
 223                                                 current->FlushWriteBuf();
 224                                         }
 225                                 }
 226                         }
 227                         return;
 228                 }
 229                 if ((result == -1) && (errno != EAGAIN) && (errno != EINTR))
 230                 {
 231                         log(DEBUG,"killing: %s",cu->nick);
 232                         kill_link(cu,strerror(errno));
 233                         return;
 234                 }
 235         }
 236         // result EAGAIN means nothing read
 237         else if (result == EAGAIN)
 238         {
 239         }
 240         else if (result == 0)
 241         {
 242                 log(DEBUG,"InspIRCd: Exited: %s",cu->nick);
 243                 kill_link(cu,"Client exited");
 244                 log(DEBUG,"Bailing from client exit");
 245                 return;
 246         }
 247 }
 248
 249
 250 /**
 251  * This function is called once a second from the mainloop.
 252  * It is intended to do background checking on all the user structs, e.g.
 253  * stuff like ping checks, registration timeouts, etc.
 254  * The function returns false when it is finished, and true if
 255  * it needs to be run again (e.g. it has processed one of a batch of
 256  * QUIT messages, but couldnt continue iterating because the iterator
 257  * became invalid). This function is also responsible for checking
 258  * if InspSocket derived classes are timed out.
 259  */
 260 bool DoBackgroundUserStuff(time_t TIME)
 261 {
 262         unsigned int numsockets = module_sockets.size();
 263         for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 264         {
 265                 InspSocket* s = (InspSocket*)*a;
 266                 if (s->Timeout(TIME))
 267                 {
 268                         log(DEBUG,"Socket poll returned false, close and bail");
 269                         SE->DelFd(s->GetFd());
 270                         s->Close();
 271                         module_sockets.erase(a);
 272                         delete s;
 273                         break;
 274                 }
 275                 if (module_sockets.size() != numsockets) break;
 276         }
 277         /* TODO: We need a seperate hash containing only local users for this
 278          */
 279         for (std::vector<userrec*>::iterator count2 = local_users.begin(); count2 != local_users.end(); count2++)
 280         {
 281                 /* Sanity checks for corrupted iterators (yes, really) */
 282                 userrec* curr = NULL;
 283                 if (*count2)
 284                         curr = (userrec*)(*count2);
 285                 if ((long)curr == -1)
 286                         return false;
 287
 288                 if ((curr) && (curr->fd != 0)) /* XXX - why are we checking fd != 0? --w00t */
 289                 {
 290                         int currfd = curr->fd;
 291                         // we don't check the state of remote users.
 292                         if (IS_LOCAL(curr))
 293                         {
 294                                 curr->FlushWriteBuf();
 295                                 if (curr->GetWriteError() != "")
 296                                 {
 297                                         log(DEBUG,"InspIRCd: write error: %s",curr->GetWriteError().c_str());
 298                                         kill_link(curr,curr->GetWriteError().c_str());
 299                                         return true;
 300                                 }
 301                                 // registration timeout -- didnt send USER/NICK/HOST in the time specified in
 302                                 // their connection class.
 303                                 if (((unsigned)TIME > (unsigned)curr->timeout) && (curr->registered != 7))
 304                                 {
 305                                         log(DEBUG,"InspIRCd: registration timeout: %s",curr->nick);
 306                                         kill_link(curr,"Registration timeout");
 307                                         return true;
 308                                 }
 309                                 if ((TIME > curr->signon) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 310                                 {
 311                                         log(DEBUG,"signon exceed, registered=3, and modules ready, OK: %d %d",TIME,curr->signon);
 312                                         curr->dns_done = true;
 313                                         stats->statsDnsBad++;
 314                                         FullConnectUser(curr);
 315                                         if (fd_ref_table[currfd] != curr) // something changed, bail pronto
 316                                                 return true;
 317                                  }
 318                                  if ((curr->dns_done) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 319                                  {
 320                                        log(DEBUG,"dns done, registered=3, and modules ready, OK");
 321                                        FullConnectUser(curr);
 322                                        if (fd_ref_table[currfd] != curr) // something changed, bail pronto
 323                                                 return true;
 324                                  }
 325                                  if ((TIME > curr->nping) && (isnick(curr->nick)) && (curr->registered == 7))
 326                                  {
 327                                        if ((!curr->lastping) && (curr->registered == 7))
 328                                        {
 329                                                log(DEBUG,"InspIRCd: ping timeout: %s",curr->nick);
 330                                                kill_link(curr,"Ping timeout");
 331                                                return true;
 332                                        }
 333                                        Write(curr->fd,"PING :%s",Config->ServerName);
 334                                        log(DEBUG,"InspIRCd: pinging: %s",curr->nick);
 335                                        curr->lastping = 0;
 336                                        curr->nping = TIME+curr->pingmax;       // was hard coded to 120
 337                                 }
 338                         }
 339                 }
 340         }
 341         return false;
 342 }
 343
 344 void OpenLog(char** argv, int argc)
 345 {
 346         std::string logpath = GetFullProgDir(argv,argc) + "/ircd.log";
 347         Config->log_file = fopen(logpath.c_str(),"a+");
 348         if (!Config->log_file)
 349         {
 350                 printf("ERROR: Could not write to logfile %s, bailing!\n\n",logpath.c_str());
 351                 Exit(ERROR);
 352         }
 353 #ifdef IS_CYGWIN
 354         printf("Logging to ircd.log...\n");
 355 #else
 356         printf("Logging to %s...\n",logpath.c_str());
 357 #endif
 358 }
 359
 360
 361 void CheckRoot()
 362 {
 363         if (geteuid() == 0)
 364         {
 365                 printf("WARNING!!! You are running an irc server as ROOT!!! DO NOT DO THIS!!!\n\n");
 366                 log(DEFAULT,"InspIRCd: startup: not starting with UID 0!");
 367                 Exit(ERROR);
 368         }
 369 }
 370
 371
 372 void CheckDie()
 373 {
 374         if (*Config->DieValue)
 375         {
 376                 printf("WARNING: %s\n\n",Config->DieValue);
 377                 log(DEFAULT,"Ut-Oh, somebody didn't read their config file: '%s'",Config->DieValue);
 378                 exit(0);
 379         }
 380 }
 381
 382 void LoadAllModules()
 383 {
 384         /* We must load the modules AFTER initializing the socket engine, now */
 385         MODCOUNT = -1;
 386         char configToken[MAXBUF];
 387         for (int count = 0; count < Config->ConfValueEnum("module",&Config->config_f); count++)
 388         {
 389                 Config->ConfValue("module","name",count,configToken,&Config->config_f);
 390                 printf("Loading module... \033[1;32m%s\033[0m\n",configToken);
 391                 if (!ServerInstance->LoadModule(configToken))
 392                 {
 393                         log(DEFAULT,"Exiting due to a module loader error.");
 394                         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());
 395                         Exit(0);
 396                 }
 397         }
 398         log(DEFAULT,"Total loaded modules: %lu",(unsigned long)MODCOUNT+1);
 399 }
 400
 401