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