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 "inspircd_util.h"
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <sys/errno.h>
  28 #include <sys/ioctl.h>
  29 #include <sys/utsname.h>
  30 #include <time.h>
  31 #include <string>
  32 #ifdef GCC3
  33 #include <ext/hash_map>
  34 #else
  35 #include <hash_map>
  36 #endif
  37 #include <map>
  38 #include <sstream>
  39 #include <vector>
  40 #include <deque>
  41 #include <sched.h>
  42 #ifdef THREADED_DNS
  43 #include <pthread.h>
  44 #endif
  45 #include "users.h"
  46 #include "ctables.h"
  47 #include "globals.h"
  48 #include "modules.h"
  49 #include "dynamic.h"
  50 #include "wildcard.h"
  51 #include "message.h"
  52 #include "mode.h"
  53 #include "commands.h"
  54 #include "xline.h"
  55 #include "inspstring.h"
  56 #include "dnsqueue.h"
  57 #include "helperfuncs.h"
  58 #include "hashcomp.h"
  59 #include "socketengine.h"
  60 #include "typedefs.h"
  61
  62 extern int MODCOUNT;
  63 extern int openSockfd[MAXSOCKS];
  64 extern struct sockaddr_in client,server;
  65 extern socklen_t length;
  66 extern std::vector<Module*> modules;
  67 extern std::vector<std::string> module_names;
  68 extern std::vector<ircd_module*> factory;
  69 extern std::vector<InspSocket*> module_sockets;
  70 extern SocketEngine* SE;
  71 extern time_t TIME;
  72 extern time_t OLDTIME;
  73 extern time_t startup_time;
  74
  75 extern serverstats* stats;
  76 extern ServerConfig *Config;
  77
  78 extern userrec* fd_ref_table[65536];
  79 char data[65536];
  80
  81 extern user_hash clientlist;
  82 extern chan_hash chanlist;
  83 extern whowas_hash whowas;
  84
  85 void ProcessUser(userrec* cu)
  86 {
  87         int result = EAGAIN;
  88         log(DEBUG,"Processing user with fd %d",cu->fd);
  89         int MOD_RESULT = 0;
  90         int result2 = 0;
  91         FOREACH_RESULT(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         log(DEBUG,"Read result: %d",result);
 102         if (result)
 103         {
 104                 stats->statsRecv += result;
 105                 // perform a check on the raw buffer as an array (not a string!) to remove
 106                 // characters 0 and 7 which are illegal in the RFC - replace them with spaces.
 107                 // hopefully this should stop even more people whining about "Unknown command: *"
 108                 for (int checker = 0; checker < result; checker++)
 109                 {
 110                         if ((data[checker] == 0) || (data[checker] == 7))
 111                                 data[checker] = ' ';
 112                 }
 113                 if (result > 0)
 114                         data[result] = '\0';
 115                 userrec* current = cu;
 116                 int currfd = current->fd;
 117                 int floodlines = 0;
 118                 // add the data to the users buffer
 119                 if (result > 0)
 120                 {
 121                         if (!current->AddBuffer(data))
 122                         {
 123                                 // AddBuffer returned false, theres too much data in the user's buffer and theyre up to no good.
 124                                 if (current->registered == 7)
 125                                 {
 126                                         kill_link(current,"RecvQ exceeded");
 127                                 }
 128                                 else
 129                                 {
 130                                         WriteOpers("*** Excess flood from %s",current->ip);
 131                                         log(DEFAULT,"Excess flood from: %s",current->ip);
 132                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 133                                         apply_lines(APPLY_ZLINES);
 134                                 }
 135                                 return;
 136                         }
 137                         if (current->recvq.length() > (unsigned)Config->NetBufferSize)
 138                         {
 139                                 if (current->registered == 7)
 140                                 {
 141                                         kill_link(current,"RecvQ exceeded");
 142                                 }
 143                                 else
 144                                 {
 145                                         WriteOpers("*** Excess flood from %s",current->ip);
 146                                         log(DEFAULT,"Excess flood from: %s",current->ip);
 147                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 148                                         apply_lines(APPLY_ZLINES);
 149                                 }
 150                                 return;
 151                         }
 152                         // while there are complete lines to process...
 153                         while (current->BufferIsReady())
 154                         {
 155                                 floodlines++;
 156                                 if (TIME > current->reset_due)
 157                                 {
 158                                         current->reset_due = TIME + current->threshold;
 159                                         current->lines_in = 0;
 160                                 }
 161                                 current->lines_in++;
 162                                 if (current->lines_in > current->flood)
 163                                 {
 164                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 165                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 166                                         kill_link(current,"Excess flood");
 167                                         return;
 168                                 }
 169                                 if ((floodlines > current->flood) && (current->flood != 0))
 170                                 {
 171                                         if (current->registered == 7)
 172                                         {
 173                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 174                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 175                                                 kill_link(current,"Excess flood");
 176                                         }
 177                                         else
 178                                         {
 179                                                 add_zline(120,Config->ServerName,"Flood from unregistered connection",current->ip);
 180                                                 apply_lines(APPLY_ZLINES);
 181                                         }
 182                                         return;
 183                                 }
 184                                 char sanitized[MAXBUF];
 185                                 // use GetBuffer to copy single lines into the sanitized string
 186                                 std::string single_line = current->GetBuffer();
 187                                 current->bytes_in += single_line.length();
 188                                 current->cmds_in++;
 189                                 if (single_line.length()>512)
 190                                 {
 191                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 192                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 193                                         kill_link(current,"Excess flood");
 194                                         return;
 195                                 }
 196                                 strlcpy(sanitized,single_line.c_str(),MAXBUF);
 197                                 if (*sanitized)
 198                                 {
 199                                         userrec* old_comp = fd_ref_table[currfd];
 200                                         // we're gonna re-scan to check if the nick is gone, after every
 201                                         // command - if it has, we're gonna bail
 202                                         process_buffer(sanitized,current);
 203                                         // look for the user's record in case it's changed... if theyve quit,
 204                                         // we cant do anything more with their buffer, so bail.
 205                                         // there used to be an ugly, slow loop here. Now we have a reference
 206                                         // table, life is much easier (and FASTER)
 207                                         userrec* new_comp = fd_ref_table[currfd];
 208                                         if ((currfd < 0) || (!fd_ref_table[currfd]) || (old_comp != new_comp))
 209                                         {
 210                                                 return;
 211                                         }
 212                                         else
 213                                         {
 214                                                 /* The user is still here, flush their buffer */
 215                                                 current->FlushWriteBuf();
 216                                         }
 217                                 }
 218                         }
 219                         return;
 220                 }
 221                 if ((result == -1) && (errno != EAGAIN) && (errno != EINTR))
 222                 {
 223                         log(DEBUG,"killing: %s",cu->nick);
 224                         kill_link(cu,strerror(errno));
 225                         return;
 226                 }
 227         }
 228         // result EAGAIN means nothing read
 229         else if (result == EAGAIN)
 230         {
 231         }
 232         else if (result == 0)
 233         {
 234                 log(DEBUG,"InspIRCd: Exited: %s",cu->nick);
 235                 kill_link(cu,"Client exited");
 236                 log(DEBUG,"Bailing from client exit");
 237                 return;
 238         }
 239 }
 240
 241
 242 /**
 243  * This function is called once a second from the mainloop.
 244  * It is intended to do background checking on all the user structs, e.g.
 245  * stuff like ping checks, registration timeouts, etc.
 246  * The function returns false when it is finished, and true if
 247  * it needs to be run again (e.g. it has processed one of a batch of
 248  * QUIT messages, but couldnt continue iterating because the iterator
 249  * became invalid). This function is also responsible for checking
 250  * if InspSocket derived classes are timed out.
 251  */
 252 bool DoBackgroundUserStuff(time_t TIME)
 253 {
 254         unsigned int numsockets = module_sockets.size();
 255         for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 256         {
 257                 InspSocket* s = (InspSocket*)*a;
 258                 if (s->Timeout(TIME))
 259                 {
 260                         log(DEBUG,"Socket poll returned false, close and bail");
 261                         SE->DelFd(s->GetFd());
 262                         s->Close();
 263                         module_sockets.erase(a);
 264                         delete s;
 265                         break;
 266                 }
 267                 if (module_sockets.size() != numsockets) break;
 268         }
 269         /* TODO: We need a seperate hash containing only local users for this
 270          */
 271         for (user_hash::iterator count2 = clientlist.begin(); count2 != clientlist.end(); count2++)
 272         {
 273                 /* Sanity checks for corrupted iterators (yes, really) */
 274                 userrec* curr = NULL;
 275                 if (count2->second)
 276                         curr = count2->second;
 277                 if ((long)curr == -1)
 278                         return false;
 279
 280                 if ((curr) && (curr->fd != 0)) /* XXX - why are we checking fd != 0? --w00t */
 281                 {
 282                         int currfd = curr->fd;
 283                         // we don't check the state of remote users.
 284                         if (IS_LOCAL(curr))
 285                         {
 286                                 curr->FlushWriteBuf();
 287                                 if (curr->GetWriteError() != "")
 288                                 {
 289                                         log(DEBUG,"InspIRCd: write error: %s",curr->GetWriteError().c_str());
 290                                         kill_link(curr,curr->GetWriteError().c_str());
 291                                         return true;
 292                                 }
 293                                 // registration timeout -- didnt send USER/NICK/HOST in the time specified in
 294                                 // their connection class.
 295                                 if (((unsigned)TIME > (unsigned)curr->timeout) && (curr->registered != 7))
 296                                 {
 297                                         log(DEBUG,"InspIRCd: registration timeout: %s",curr->nick);
 298                                         kill_link(curr,"Registration timeout");
 299                                         return true;
 300                                 }
 301                                 if ((TIME > curr->signon) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 302                                 {
 303                                         log(DEBUG,"signon exceed, registered=3, and modules ready, OK: %d %d",TIME,curr->signon);
 304                                         curr->dns_done = true;
 305                                         stats->statsDnsBad++;
 306                                         FullConnectUser(curr);
 307                                         if (fd_ref_table[currfd] != curr) // something changed, bail pronto
 308                                                 return true;
 309                                  }
 310                                  if ((curr->dns_done) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 311                                  {
 312                                        log(DEBUG,"dns done, registered=3, and modules ready, OK");
 313                                        FullConnectUser(curr);
 314                                        if (fd_ref_table[currfd] != curr) // something changed, bail pronto
 315                                                 return true;
 316                                  }
 317                                  if ((TIME > curr->nping) && (isnick(curr->nick)) && (curr->registered == 7))
 318                                  {
 319                                        if ((!curr->lastping) && (curr->registered == 7))
 320                                        {
 321                                                log(DEBUG,"InspIRCd: ping timeout: %s",curr->nick);
 322                                                kill_link(curr,"Ping timeout");
 323                                                return true;
 324                                        }
 325                                        Write(curr->fd,"PING :%s",Config->ServerName);
 326                                        log(DEBUG,"InspIRCd: pinging: %s",curr->nick);
 327                                        curr->lastping = 0;
 328                                        curr->nping = TIME+curr->pingmax;       // was hard coded to 120
 329                                 }
 330                         }
 331                 }
 332         }
 333         return false;
 334 }
 335
 336 void OpenLog(char** argv, int argc)
 337 {
 338         std::string logpath = GetFullProgDir(argv,argc) + "/ircd.log";
 339         Config->log_file = fopen(logpath.c_str(),"a+");
 340         if (!Config->log_file)
 341         {
 342                 printf("ERROR: Could not write to logfile %s, bailing!\n\n",logpath.c_str());
 343                 Exit(ERROR);
 344         }
 345 #ifdef IS_CYGWIN
 346         printf("Logging to ircd.log...\n");
 347 #else
 348         printf("Logging to %s...\n",logpath.c_str());
 349 #endif
 350 }
 351
 352
 353 void CheckRoot()
 354 {
 355         if (geteuid() == 0)
 356         {
 357                 printf("WARNING!!! You are running an irc server as ROOT!!! DO NOT DO THIS!!!\n\n");
 358                 log(DEFAULT,"InspIRCd: startup: not starting with UID 0!");
 359                 Exit(ERROR);
 360         }
 361 }
 362
 363
 364 void CheckDie()
 365 {
 366         if (*Config->DieValue)
 367         {
 368                 printf("WARNING: %s\n\n",Config->DieValue);
 369                 log(DEFAULT,"Ut-Oh, somebody didn't read their config file: '%s'",Config->DieValue);
 370                 exit(0);
 371         }
 372 }
 373
 374 void LoadAllModules()
 375 {
 376         /* We must load the modules AFTER initializing the socket engine, now */
 377         MODCOUNT = -1;
 378         char configToken[MAXBUF];
 379         for (int count = 0; count < ConfValueEnum("module",&Config->config_f); count++)
 380         {
 381                 ConfValue("module","name",count,configToken,&Config->config_f);
 382                 printf("Loading module... \033[1;32m%s\033[0m\n",configToken);
 383                 if (!LoadModule(configToken))
 384                 {
 385                         log(DEFAULT,"Exiting due to a module loader error.");
 386                         printf("\nThere was an error loading a module: %s\n\nYou might want to do './inspircd start' instead of 'bin/inspircd'\n\n",ModuleError());
 387                         Exit(0);
 388                 }
 389         }
 390         log(DEFAULT,"Total loaded modules: %lu",(unsigned long)MODCOUNT+1);
 391 }
 392
 393