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 = 0;
 123
 124                 ServerInstance->stats->statsRecv += result;
 125                 /*
 126                  * perform a check on the raw buffer as an array (not a string!) to remove
 127                  * character 0 which is illegal in the RFC - replace them with spaces.
 128                  * XXX - no garauntee there's not \0's in the middle of the data,
 129                  *       and no reason for it to be terminated either. -- Om
 130                  */
 131
 132                 for (int checker = 0; checker < result; checker++)
 133                 {
 134                         if (data[checker] == 0)
 135                                 data[checker] = ' ';
 136                 }
 137
 138                 if (result > 0)
 139                         data[result] = '\0';
 140
 141                 current = cu;
 142                 currfd = current->fd;
 143
 144                 // add the data to the users buffer
 145                 if (result > 0)
 146                 {
 147                         if (!current->AddBuffer(data))
 148                         {
 149                                 // AddBuffer returned false, theres too much data in the user's buffer and theyre up to no good.
 150                                 if (current->registered == REG_ALL)
 151                                 {
 152                                         // Make sure they arn't flooding long lines.
 153                                         if (TIME > current->reset_due)
 154                                         {
 155                                                 current->reset_due = TIME + current->threshold;
 156                                                 current->lines_in = 0;
 157                                         }
 158
 159                                         current->lines_in++;
 160
 161                                         if (current->lines_in > current->flood)
 162                                         {
 163                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 164                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 165                                                 kill_link(current,"Excess flood");
 166                                                 return;
 167                                         }
 168                                         else
 169                                         {
 170                                                 WriteServ(currfd, "NOTICE %s :Your previous line was too long and was not delivered (Over 512chars) Please shorten it.", current->nick);
 171                                                 current->recvq = "";
 172                                         }
 173                                 }
 174                                 else
 175                                 {
 176                                         WriteOpers("*** Excess flood from %s",(char*)inet_ntoa(current->ip4));
 177                                         log(DEFAULT,"Excess flood from: %s",(char*)inet_ntoa(current->ip4));
 178                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 179                                         apply_lines(APPLY_ZLINES);
 180                                 }
 181
 182                                 return;
 183                         }
 184
 185                         if (current->recvq.length() > (unsigned)Config->NetBufferSize)
 186                         {
 187                                 if (current->registered == REG_ALL)
 188                                 {
 189                                         kill_link(current,"RecvQ exceeded");
 190                                 }
 191                                 else
 192                                 {
 193                                         WriteOpers("*** Excess flood from %s",(char*)inet_ntoa(current->ip4));
 194                                         log(DEFAULT,"Excess flood from: %s",(char*)inet_ntoa(current->ip4));
 195                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 196                                         apply_lines(APPLY_ZLINES);
 197                                 }
 198
 199                                 return;
 200                         }
 201
 202                         // while there are complete lines to process...
 203                         while (current->BufferIsReady())
 204                         {
 205                                 if (TIME > current->reset_due)
 206                                 {
 207                                         current->reset_due = TIME + current->threshold;
 208                                         current->lines_in = 0;
 209                                 }
 210
 211                                 if (++current->lines_in > current->flood)
 212                                 {
 213                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 214                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 215                                         kill_link(current,"Excess flood");
 216                                         return;
 217                                 }
 218
 219                                 if ((++floodlines > current->flood) && (current->flood != 0))
 220                                 {
 221                                         if (current->registered == REG_ALL)
 222                                         {
 223                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 224                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 225                                                 kill_link(current,"Excess flood");
 226                                         }
 227                                         else
 228                                         {
 229                                                 add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 230                                                 apply_lines(APPLY_ZLINES);
 231                                         }
 232
 233                                         return;
 234                                 }
 235
 236                                 // use GetBuffer to copy single lines into the sanitized string
 237                                 std::string single_line = current->GetBuffer();
 238                                 current->bytes_in += single_line.length();
 239                                 current->cmds_in++;
 240                                 if (single_line.length() > 512)
 241                                         single_line.resize(512);
 242
 243                                 userrec* old_comp = fd_ref_table[currfd];
 244
 245                                 ServerInstance->Parser->ProcessBuffer(single_line,current);
 246                                 /*
 247                                  * look for the user's record in case it's changed... if theyve quit,
 248                                  * we cant do anything more with their buffer, so bail.
 249                                  * there used to be an ugly, slow loop here. Now we have a reference
 250                                  * table, life is much easier (and FASTER)
 251                                  */
 252                                 userrec* new_comp = fd_ref_table[currfd];
 253                                 if ((currfd < 0) || (!fd_ref_table[currfd]) || (old_comp != new_comp))
 254                                 {
 255                                         return;
 256                                 }
 257                                 else
 258                                 {
 259                                         /* The user is still here, flush their buffer */
 260                                         current->FlushWriteBuf();
 261                                 }
 262                         }
 263
 264                         return;
 265                 }
 266
 267                 if ((result == -1) && (errno != EAGAIN) && (errno != EINTR))
 268                 {
 269                         log(DEBUG,"killing: %s",cu->nick);
 270                         kill_link(cu,strerror(errno));
 271                         return;
 272                 }
 273         }
 274
 275         // result EAGAIN means nothing read
 276         else if ((result == EAGAIN) || (result == -EAGAIN))
 277         {
 278                 /* do nothing */
 279         }
 280         else if (result == 0)
 281         {
 282                 log(DEBUG,"InspIRCd: Exited: %s",cu->nick);
 283                 kill_link(cu,"Client exited");
 284                 log(DEBUG,"Bailing from client exit");
 285                 return;
 286         }
 287 }
 288
 289 void DoSocketTimeouts(time_t TIME)
 290 {
 291         unsigned int numsockets = module_sockets.size();
 292         SocketEngine* SE = ServerInstance->SE;
 293
 294         for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 295         {
 296                 InspSocket* s = (InspSocket*)*a;
 297                 if ((s) && (s->GetFd() >= 0) && (s->GetFd() < MAX_DESCRIPTORS) && (socket_ref[s->GetFd()] != NULL) && (s->Timeout(TIME)))
 298                 {
 299                         log(DEBUG,"userprocess.cpp: Socket poll returned false, close and bail");
 300                         socket_ref[s->GetFd()] = NULL;
 301                         SE->DelFd(s->GetFd());
 302                         module_sockets.erase(a);
 303                         s->Close();
 304                         DELETE(s);
 305                         break;
 306                 }
 307
 308                 if (module_sockets.size() != numsockets)
 309                         break;
 310         }
 311 }
 312
 313 /**
 314  * This function is called once a second from the mainloop.
 315  * It is intended to do background checking on all the user structs, e.g.
 316  * stuff like ping checks, registration timeouts, etc. This function is
 317  * also responsible for checking if InspSocket derived classes are timed out.
 318  */
 319 void DoBackgroundUserStuff(time_t TIME)
 320 {
 321         CullList GlobalGoners;
 322
 323         int cfd = 0;
 324
 325         /* XXX: IT IS NOT SAFE TO USE AN ITERATOR HERE. DON'T EVEN THINK ABOUT IT. */
 326         for (unsigned long count2 = 0; count2 != local_users.size(); count2++)
 327         {
 328                 if (count2 >= local_users.size())
 329                         break;
 330
 331                 userrec* curr = local_users[count2];
 332
 333                 if (curr)
 334                 {
 335                         cfd = curr->fd;
 336
 337                         if ((cfd > -1) && (cfd < MAX_DESCRIPTORS) && (fd_ref_table[cfd] == curr) && (curr))
 338                         {
 339                                 /*
 340                                  * registration timeout -- didnt send USER/NICK/HOST
 341                                  * in the time specified in their connection class.
 342                                  */
 343                                 if (((unsigned)TIME > (unsigned)curr->timeout) && (curr->registered != REG_ALL))
 344                                 {
 345                                         log(DEBUG,"InspIRCd: registration timeout: %s",curr->nick);
 346                                         ZapThisDns(curr->fd);
 347                                         GlobalGoners.AddItem(curr,"Registration timeout");
 348                                         continue;
 349                                 }
 350
 351                                 /*
 352                                  * user has signed on with USER/NICK/PASS, and dns has completed, all the modules
 353                                  * say this user is ok to proceed, fully connect them.
 354                                  */
 355                                 if ((TIME > curr->signon) && (curr->registered == REG_NICKUSER) && (AllModulesReportReady(curr)))
 356                                 {
 357                                         curr->dns_done = true;
 358                                         ZapThisDns(curr->fd);
 359                                         ServerInstance->stats->statsDnsBad++;
 360                                         FullConnectUser(curr,&GlobalGoners);
 361                                         continue;
 362                                 }
 363
 364                                 if ((fd_ref_table[cfd] != curr) && (curr))
 365                                         /* Somebody blatted this user in OnCheckReady (!) */
 366                                         continue;
 367
 368                                 if ((curr->dns_done) && (curr->registered == REG_NICKUSER) && (AllModulesReportReady(curr)))
 369                                 {
 370                                         log(DEBUG,"dns done, registered=3, and modules ready, OK");
 371                                         FullConnectUser(curr,&GlobalGoners);
 372                                         ZapThisDns(curr->fd);
 373                                         continue;
 374                                 }
 375
 376                                 if ((fd_ref_table[cfd] != curr) && (curr))
 377                                         /* Somebody blatted this user in OnCheckReady (!) */
 378                                         continue;
 379
 380                                 // It's time to PING this user. Send them a ping.
 381                                 if ((TIME > curr->nping) && (curr->registered == REG_ALL))
 382                                 {
 383                                         // This user didn't answer the last ping, remove them
 384                                         if (!curr->lastping)
 385                                         {
 386                                                 GlobalGoners.AddItem(curr,"Ping timeout");
 387                                                 curr->lastping = 1;
 388                                                 curr->nping = TIME+curr->pingmax;
 389                                                 continue;
 390                                         }
 391
 392                                         Write(curr->fd,"PING :%s",Config->ServerName);
 393                                         curr->lastping = 0;
 394                                         curr->nping = TIME+curr->pingmax;
 395                                 }
 396                         }
 397
 398                         /*
 399                          * We can flush the write buffer as the last thing we do, because if they
 400                          * match any of the above conditions its no use flushing their buffer anyway.
 401                          */
 402
 403                         /* Check again that theyre still here (something above may have changed that) */
 404                         if ((cfd > -1) && (cfd < MAX_DESCRIPTORS) && (fd_ref_table[cfd] == curr) && (curr))
 405                         {
 406                                 curr->FlushWriteBuf();
 407                                 if (*curr->GetWriteError())
 408                                 {
 409                                         GlobalGoners.AddItem(curr,curr->GetWriteError());
 410                                         continue;
 411                                 }
 412                         }
 413                 }
 414         }
 415
 416         /* Remove all the queued users who are due to be quit, free memory used. */
 417         GlobalGoners.Apply();
 418 }