src/userprocess.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 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 "configreader.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 #include <ext/hash_map>
  32 #include <map>
  33 #include <sstream>
  34 #include <vector>
  35 #include <deque>
  36 #include <sched.h>
  37 #ifdef THREADED_DNS
  38 #include <pthread.h>
  39 #endif
  40 #include "users.h"
  41 #include "ctables.h"
  42 #include "globals.h"
  43 #include "modules.h"
  44 #include "dynamic.h"
  45 #include "wildcard.h"
  46 #include "message.h"
  47 #include "mode.h"
  48 #include "commands.h"
  49 #include "xline.h"
  50 #include "inspstring.h"
  51 #include "dnsqueue.h"
  52 #include "helperfuncs.h"
  53 #include "hashcomp.h"
  54 #include "socketengine.h"
  55 #include "userprocess.h"
  56 #include "typedefs.h"
  57 #include "command_parse.h"
  58 #include "cull_list.h"
  59
  60 extern struct sockaddr_in client,server;
  61 extern socklen_t length;
  62 extern std::vector<Module*> modules;
  63 extern std::vector<ircd_module*> factory;
  64 extern std::vector<InspSocket*> module_sockets;
  65 extern time_t TIME;
  66 extern time_t OLDTIME;
  67 extern std::vector<userrec*> local_users;
  68 extern InspSocket* socket_ref[MAX_DESCRIPTORS];
  69
  70 extern InspIRCd* ServerInstance;
  71 extern ServerConfig *Config;
  72 extern userrec* fd_ref_table[MAX_DESCRIPTORS];
  73 char data[65536];
  74
  75 extern user_hash clientlist;
  76 extern chan_hash chanlist;
  77
  78 void ProcessUser(userrec* cu)
  79 {
  80         int result = EAGAIN;
  81
  82         if (cu->fd == FD_MAGIC_NUMBER)
  83                 return;
  84
  85         log(DEBUG,"Processing user with fd %d",cu->fd);
  86
  87         if (Config->GetIOHook(cu->port))
  88         {
  89                 int result2 = 0;
  90                 int MOD_RESULT = 0;
  91
  92                 try
  93                 {
  94                         MOD_RESULT = Config->GetIOHook(cu->port)->OnRawSocketRead(cu->fd,data,65535,result2);
  95                         log(DEBUG,"Data result returned by module: %d",MOD_RESULT);
  96                 }
  97                 catch (ModuleException& modexcept)
  98                 {
  99                         log(DEBUG,"Module exception caught: %s",modexcept.GetReason());
 100                 }
 101
 102                 if (MOD_RESULT < 0)
 103                 {
 104                         result = -EAGAIN;
 105                 }
 106                 else
 107                 {
 108                         result = result2;
 109                 }
 110         }
 111         else
 112         {
 113                 result = cu->ReadData(data, 65535);
 114         }
 115
 116         log(DEBUG,"Read result: %d",result);
 117
 118         if ((result) && (result != -EAGAIN))
 119         {
 120                 userrec *current;
 121                 int currfd;
 122                 int floodlines;
 123
 124                 ServerInstance->stats->statsRecv += result;
 125                 /*
 126                  * perform a check on the raw buffer as an array (not a string!) to remove
 127                  * characters 0 and 7 which are illegal in the RFC - replace them with spaces.
 128                  * hopefully this should stop even more people whining about "Unknown command: *"
 129                  */
 130
 131                 /*
 132                  * XXX - potential replacement for the below using my beloved pointers. --w00t
 133                  * XXX - no garauntee there's not \0's in the middle of the data,
 134                  *       and no reason for it to be terminated either. -- Om
 135                  *
 136                  * for (char *c = data; data && *data; data++)
 137                  * {
 138                  *      if (*data == 0 || *data == 7)
 139                  *              data = ' ';
 140                  * }
 141                  */
 142
 143                 for (int checker = 0; checker < result; checker++)
 144                 {
 145                         if ((data[checker] == 0) || (data[checker] == 7))
 146                                 data[checker] = ' ';
 147                 }
 148
 149                 if (result > 0)
 150                         data[result] = '\0';
 151
 152                 current = cu;
 153                 currfd = current->fd;
 154                 floodlines = 0;
 155
 156                 // add the data to the users buffer
 157                 if (result > 0)
 158                 {
 159                         if (!current->AddBuffer(data))
 160                         {
 161                                 // AddBuffer returned false, theres too much data in the user's buffer and theyre up to no good.
 162                                 if (current->registered == 7)
 163                                 {
 164                                         // Make sure they arn't flooding long lines.
 165                                         if (TIME > current->reset_due)
 166                                         {
 167                                                 current->reset_due = TIME + current->threshold;
 168                                                 current->lines_in = 0;
 169                                         }
 170
 171                                         current->lines_in++;
 172
 173                                         if (current->lines_in > current->flood)
 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                                                 return;
 179                                         }
 180                                         else
 181                                         {
 182                                                 WriteServ(currfd, "NOTICE %s :Your previous line was too long and was not delivered (Over 512chars) Please shorten it.", current->nick);
 183                                                 current->recvq = "";
 184                                         }
 185                                 }
 186                                 else
 187                                 {
 188                                         WriteOpers("*** Excess flood from %s",(char*)inet_ntoa(current->ip4));
 189                                         log(DEFAULT,"Excess flood from: %s",(char*)inet_ntoa(current->ip4));
 190                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 191                                         apply_lines(APPLY_ZLINES);
 192                                 }
 193
 194                                 return;
 195                         }
 196
 197                         if (current->recvq.length() > (unsigned)Config->NetBufferSize)
 198                         {
 199                                 if (current->registered == 7)
 200                                 {
 201                                         kill_link(current,"RecvQ exceeded");
 202                                 }
 203                                 else
 204                                 {
 205                                         WriteOpers("*** Excess flood from %s",(char*)inet_ntoa(current->ip4));
 206                                         log(DEFAULT,"Excess flood from: %s",(char*)inet_ntoa(current->ip4));
 207                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 208                                         apply_lines(APPLY_ZLINES);
 209                                 }
 210
 211                                 return;
 212                         }
 213
 214                         // while there are complete lines to process...
 215                         while (current->BufferIsReady())
 216                         {
 217                                 char sanitized[MAXBUF];
 218
 219                                 floodlines++;
 220                                 if (TIME > current->reset_due)
 221                                 {
 222                                         current->reset_due = TIME + current->threshold;
 223                                         current->lines_in = 0;
 224                                 }
 225
 226                                 current->lines_in++;
 227
 228                                 if (current->lines_in > current->flood)
 229                                 {
 230                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 231                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 232                                         kill_link(current,"Excess flood");
 233                                         return;
 234                                 }
 235
 236                                 if ((floodlines > current->flood) && (current->flood != 0))
 237                                 {
 238                                         if (current->registered == 7)
 239                                         {
 240                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 241                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 242                                                 kill_link(current,"Excess flood");
 243                                         }
 244                                         else
 245                                         {
 246                                                 add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 247                                                 apply_lines(APPLY_ZLINES);
 248                                         }
 249
 250                                         return;
 251                                 }
 252
 253                                 // use GetBuffer to copy single lines into the sanitized string
 254                                 std::string single_line = current->GetBuffer();
 255                                 current->bytes_in += single_line.length();
 256                                 current->cmds_in++;
 257                                 strlcpy(sanitized,single_line.c_str(),511);
 258
 259                                 if (*sanitized)
 260                                 {
 261                                         userrec* old_comp = fd_ref_table[currfd];
 262
 263                                         ServerInstance->Parser->ProcessBuffer(sanitized,current);
 264                                         /*
 265                                          * look for the user's record in case it's changed... if theyve quit,
 266                                          * we cant do anything more with their buffer, so bail.
 267                                          * there used to be an ugly, slow loop here. Now we have a reference
 268                                          * table, life is much easier (and FASTER)
 269                                          */
 270                                         userrec* new_comp = fd_ref_table[currfd];
 271                                         if ((currfd < 0) || (!fd_ref_table[currfd]) || (old_comp != new_comp))
 272                                         {
 273                                                 return;
 274                                         }
 275                                         else
 276                                         {
 277                                                 /* The user is still here, flush their buffer */
 278                                                 current->FlushWriteBuf();
 279                                         }
 280                                 }
 281                         }
 282
 283                         return;
 284                 }
 285
 286                 if ((result == -1) && (errno != EAGAIN) && (errno != EINTR))
 287                 {
 288                         log(DEBUG,"killing: %s",cu->nick);
 289                         kill_link(cu,strerror(errno));
 290                         return;
 291                 }
 292         }
 293
 294         // result EAGAIN means nothing read
 295         else if ((result == EAGAIN) || (result == -EAGAIN))
 296         {
 297                 /* do nothing */
 298         }
 299         else if (result == 0)
 300         {
 301                 log(DEBUG,"InspIRCd: Exited: %s",cu->nick);
 302                 kill_link(cu,"Client exited");
 303                 log(DEBUG,"Bailing from client exit");
 304                 return;
 305         }
 306 }
 307
 308 void DoSocketTimeouts(time_t TIME)
 309 {
 310         unsigned int numsockets = module_sockets.size();
 311         SocketEngine* SE = ServerInstance->SE;
 312
 313         for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 314         {
 315                 InspSocket* s = (InspSocket*)*a;
 316                 if ((s) && (s->GetFd() >= 0) && (s->GetFd() < MAX_DESCRIPTORS) && (socket_ref[s->GetFd()] != NULL) && (s->Timeout(TIME)))
 317                 {
 318                         log(DEBUG,"userprocess.cpp: Socket poll returned false, close and bail");
 319                         socket_ref[s->GetFd()] = NULL;
 320                         SE->DelFd(s->GetFd());
 321                         module_sockets.erase(a);
 322                         s->Close();
 323                         DELETE(s);
 324                         break;
 325                 }
 326
 327                 if (module_sockets.size() != numsockets)
 328                         break;
 329         }
 330 }
 331
 332 /**
 333  * This function is called once a second from the mainloop.
 334  * It is intended to do background checking on all the user structs, e.g.
 335  * stuff like ping checks, registration timeouts, etc. This function is
 336  * also responsible for checking if InspSocket derived classes are timed out.
 337  */
 338 void DoBackgroundUserStuff(time_t TIME)
 339 {
 340         CullList GlobalGoners;
 341
 342         for (std::vector<userrec*>::iterator count2 = local_users.begin(); count2 != local_users.end(); count2++)
 343         {
 344                 /* Sanity checks for corrupted iterators (yes, really) */
 345                 userrec* curr = NULL;
 346
 347                 if (*count2)
 348                         curr = (userrec*)(*count2);
 349                 if ((long)curr == -1)
 350                         return;
 351
 352                 if (curr)
 353                 {
 354                         /*
 355                          * registration timeout -- didnt send USER/NICK/HOST
 356                          * in the time specified in their connection class.
 357                          */
 358                         if (((unsigned)TIME > (unsigned)curr->timeout) && (curr->registered != 7))
 359                         {
 360                                 log(DEBUG,"InspIRCd: registration timeout: %s",curr->nick);
 361                                 GlobalGoners.AddItem(curr,"Registration timeout");
 362                                 continue;
 363                         }
 364
 365                         /*
 366                          * user has signed on with USER/NICK/PASS, and dns has completed, all the modules
 367                          * say this user is ok to proceed, fully connect them.
 368                          */
 369                         if ((TIME > curr->signon) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 370                         {
 371                                 curr->dns_done = true;
 372                                 ServerInstance->stats->statsDnsBad++;
 373                                 FullConnectUser(curr,&GlobalGoners);
 374                                 continue;
 375                         }
 376
 377                         if ((curr->dns_done) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 378                         {
 379                                 log(DEBUG,"dns done, registered=3, and modules ready, OK");
 380                                 FullConnectUser(curr,&GlobalGoners);
 381                                 continue;
 382                         }
 383
 384                         // It's time to PING this user. Send them a ping.
 385                         if ((TIME > curr->nping) && (curr->registered == 7))
 386                         {
 387                                 // This user didn't answer the last ping, remove them
 388                                 if (!curr->lastping)
 389                                 {
 390                                         GlobalGoners.AddItem(curr,"Ping timeout");
 391                                         continue;
 392                                 }
 393
 394                                 Write(curr->fd,"PING :%s",Config->ServerName);
 395                                 curr->lastping = 0;
 396                                 curr->nping = TIME+curr->pingmax;
 397                         }
 398
 399                         /*
 400                          * We can flush the write buffer as the last thing we do, because if they
 401                          * match any of the above conditions its no use flushing their buffer anyway.
 402                          */
 403                         curr->FlushWriteBuf();
 404
 405                         if (*curr->GetWriteError())
 406                         {
 407                                 GlobalGoners.AddItem(curr,curr->GetWriteError());
 408                                 continue;
 409                         }
 410                 }
 411         }
 412
 413         /* Remove all the queued users who are due to be quit, free memory used. */
 414         GlobalGoners.Apply();
 415 }