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 #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 "userprocess.h"
  60 #include "typedefs.h"
  61 #include "command_parse.h"
  62 #include "cull_list.h"
  63
  64 extern struct sockaddr_in client,server;
  65 extern socklen_t length;
  66 extern std::vector<Module*> modules;
  67 extern std::vector<ircd_module*> factory;
  68 extern std::vector<InspSocket*> module_sockets;
  69 extern time_t TIME;
  70 extern time_t OLDTIME;
  71 extern std::vector<userrec*> local_users;
  72 extern InspSocket* socket_ref[MAX_DESCRIPTORS];
  73
  74 extern InspIRCd* ServerInstance;
  75 extern ServerConfig *Config;
  76 extern userrec* fd_ref_table[MAX_DESCRIPTORS];
  77 char data[65536];
  78
  79 extern user_hash clientlist;
  80 extern chan_hash chanlist;
  81
  82 void ProcessUser(userrec* cu)
  83 {
  84         int result = EAGAIN;
  85
  86         if (cu->fd == FD_MAGIC_NUMBER)
  87                 return;
  88
  89         log(DEBUG,"Processing user with fd %d",cu->fd);
  90
  91         if (Config->GetIOHook(cu->port))
  92         {
  93                 int result2 = 0;
  94                 int MOD_RESULT = 0;
  95
  96                 try
  97                 {
  98                         MOD_RESULT = Config->GetIOHook(cu->port)->OnRawSocketRead(cu->fd,data,65535,result2);
  99                         log(DEBUG,"Data result returned by module: %d",MOD_RESULT);
 100                 }
 101                 catch (ModuleException& modexcept)
 102                 {
 103                         log(DEBUG,"Module exception caught: %s",modexcept.GetReason());
 104                 }
 105
 106                 if (MOD_RESULT < 0)
 107                 {
 108                         result = -EAGAIN;
 109                 }
 110                 else
 111                 {
 112                         result = result2;
 113                 }
 114         }
 115         else
 116         {
 117                 result = cu->ReadData(data, 65535);
 118         }
 119
 120         log(DEBUG,"Read result: %d",result);
 121
 122         if ((result) && (result != -EAGAIN))
 123         {
 124                 userrec *current;
 125                 int currfd;
 126                 int floodlines;
 127
 128                 ServerInstance->stats->statsRecv += result;
 129                 /*
 130                  * perform a check on the raw buffer as an array (not a string!) to remove
 131                  * characters 0 and 7 which are illegal in the RFC - replace them with spaces.
 132                  * hopefully this should stop even more people whining about "Unknown command: *"
 133                  */
 134
 135                 /*
 136                  * XXX - potential replacement for the below using my beloved pointers. --w00t
 137                  * XXX - no garauntee there's not \0's in the middle of the data,
 138                  *       and no reason for it to be terminated either. -- Om
 139                  *
 140                  * for (char *c = data; data && *data; data++)
 141                  * {
 142                  *      if (*data == 0 || *data == 7)
 143                  *              data = ' ';
 144                  * }
 145                  */
 146
 147                 for (int checker = 0; checker < result; checker++)
 148                 {
 149                         if ((data[checker] == 0) || (data[checker] == 7))
 150                                 data[checker] = ' ';
 151                 }
 152
 153                 if (result > 0)
 154                         data[result] = '\0';
 155
 156                 current = cu;
 157                 currfd = current->fd;
 158                 floodlines = 0;
 159
 160                 // add the data to the users buffer
 161                 if (result > 0)
 162                 {
 163                         if (!current->AddBuffer(data))
 164                         {
 165                                 // AddBuffer returned false, theres too much data in the user's buffer and theyre up to no good.
 166                                 if (current->registered == 7)
 167                                 {
 168                                         // Make sure they arn't flooding long lines.
 169                                         if (TIME > current->reset_due)
 170                                         {
 171                                                 current->reset_due = TIME + current->threshold;
 172                                                 current->lines_in = 0;
 173                                         }
 174
 175                                         current->lines_in++;
 176
 177                                         if (current->lines_in > current->flood)
 178                                         {
 179                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 180                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 181                                                 kill_link(current,"Excess flood");
 182                                                 return;
 183                                         }
 184                                         else
 185                                         {
 186                                                 WriteServ(currfd, "NOTICE %s :Your previous line was too long and was not delivered (Over 512chars) Please shorten it.", current->nick);
 187                                                 current->recvq = "";
 188                                         }
 189                                 }
 190                                 else
 191                                 {
 192                                         WriteOpers("*** Excess flood from %s",(char*)inet_ntoa(current->ip4));
 193                                         log(DEFAULT,"Excess flood from: %s",(char*)inet_ntoa(current->ip4));
 194                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 195                                         apply_lines(APPLY_ZLINES);
 196                                 }
 197
 198                                 return;
 199                         }
 200
 201                         if (current->recvq.length() > (unsigned)Config->NetBufferSize)
 202                         {
 203                                 if (current->registered == 7)
 204                                 {
 205                                         kill_link(current,"RecvQ exceeded");
 206                                 }
 207                                 else
 208                                 {
 209                                         WriteOpers("*** Excess flood from %s",(char*)inet_ntoa(current->ip4));
 210                                         log(DEFAULT,"Excess flood from: %s",(char*)inet_ntoa(current->ip4));
 211                                         add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 212                                         apply_lines(APPLY_ZLINES);
 213                                 }
 214
 215                                 return;
 216                         }
 217
 218                         // while there are complete lines to process...
 219                         while (current->BufferIsReady())
 220                         {
 221                                 char sanitized[MAXBUF];
 222
 223                                 floodlines++;
 224                                 if (TIME > current->reset_due)
 225                                 {
 226                                         current->reset_due = TIME + current->threshold;
 227                                         current->lines_in = 0;
 228                                 }
 229
 230                                 current->lines_in++;
 231
 232                                 if (current->lines_in > current->flood)
 233                                 {
 234                                         log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 235                                         WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 236                                         kill_link(current,"Excess flood");
 237                                         return;
 238                                 }
 239
 240                                 if ((floodlines > current->flood) && (current->flood != 0))
 241                                 {
 242                                         if (current->registered == 7)
 243                                         {
 244                                                 log(DEFAULT,"Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 245                                                 WriteOpers("*** Excess flood from: %s!%s@%s",current->nick,current->ident,current->host);
 246                                                 kill_link(current,"Excess flood");
 247                                         }
 248                                         else
 249                                         {
 250                                                 add_zline(120,Config->ServerName,"Flood from unregistered connection",(char*)inet_ntoa(current->ip4));
 251                                                 apply_lines(APPLY_ZLINES);
 252                                         }
 253
 254                                         return;
 255                                 }
 256
 257                                 // use GetBuffer to copy single lines into the sanitized string
 258                                 std::string single_line = current->GetBuffer();
 259                                 current->bytes_in += single_line.length();
 260                                 current->cmds_in++;
 261                                 strlcpy(sanitized,single_line.c_str(),511);
 262
 263                                 if (*sanitized)
 264                                 {
 265                                         userrec* old_comp = fd_ref_table[currfd];
 266
 267                                         ServerInstance->Parser->ProcessBuffer(sanitized,current);
 268                                         /*
 269                                          * look for the user's record in case it's changed... if theyve quit,
 270                                          * we cant do anything more with their buffer, so bail.
 271                                          * there used to be an ugly, slow loop here. Now we have a reference
 272                                          * table, life is much easier (and FASTER)
 273                                          */
 274                                         userrec* new_comp = fd_ref_table[currfd];
 275                                         if ((currfd < 0) || (!fd_ref_table[currfd]) || (old_comp != new_comp))
 276                                         {
 277                                                 return;
 278                                         }
 279                                         else
 280                                         {
 281                                                 /* The user is still here, flush their buffer */
 282                                                 current->FlushWriteBuf();
 283                                         }
 284                                 }
 285                         }
 286
 287                         return;
 288                 }
 289
 290                 if ((result == -1) && (errno != EAGAIN) && (errno != EINTR))
 291                 {
 292                         log(DEBUG,"killing: %s",cu->nick);
 293                         kill_link(cu,strerror(errno));
 294                         return;
 295                 }
 296         }
 297
 298         // result EAGAIN means nothing read
 299         else if ((result == EAGAIN) || (result == -EAGAIN))
 300         {
 301                 /* do nothing */
 302         }
 303         else if (result == 0)
 304         {
 305                 log(DEBUG,"InspIRCd: Exited: %s",cu->nick);
 306                 kill_link(cu,"Client exited");
 307                 log(DEBUG,"Bailing from client exit");
 308                 return;
 309         }
 310 }
 311
 312 void DoSocketTimeouts(time_t TIME)
 313 {
 314         unsigned int numsockets = module_sockets.size();
 315         SocketEngine* SE = ServerInstance->SE;
 316
 317         for (std::vector<InspSocket*>::iterator a = module_sockets.begin(); a < module_sockets.end(); a++)
 318         {
 319                 InspSocket* s = (InspSocket*)*a;
 320                 if ((s) && (s->GetFd() >= 0) && (s->GetFd() < MAX_DESCRIPTORS) && (socket_ref[s->GetFd()] != NULL) && (s->Timeout(TIME)))
 321                 {
 322                         log(DEBUG,"userprocess.cpp: Socket poll returned false, close and bail");
 323                         socket_ref[s->GetFd()] = NULL;
 324                         SE->DelFd(s->GetFd());
 325                         module_sockets.erase(a);
 326                         s->Close();
 327                         delete s;
 328                         break;
 329                 }
 330
 331                 if (module_sockets.size() != numsockets)
 332                         break;
 333         }
 334 }
 335
 336 /**
 337  * This function is called once a second from the mainloop.
 338  * It is intended to do background checking on all the user structs, e.g.
 339  * stuff like ping checks, registration timeouts, etc. This function is
 340  * also responsible for checking if InspSocket derived classes are timed out.
 341  */
 342 void DoBackgroundUserStuff(time_t TIME)
 343 {
 344         CullList GlobalGoners;
 345
 346         for (std::vector<userrec*>::iterator count2 = local_users.begin(); count2 != local_users.end(); count2++)
 347         {
 348                 /* Sanity checks for corrupted iterators (yes, really) */
 349                 userrec* curr = NULL;
 350
 351                 if (*count2)
 352                         curr = (userrec*)(*count2);
 353                 if ((long)curr == -1)
 354                         return;
 355
 356                 if (curr)
 357                 {
 358                         /*
 359                          * registration timeout -- didnt send USER/NICK/HOST
 360                          * in the time specified in their connection class.
 361                          */
 362                         if (((unsigned)TIME > (unsigned)curr->timeout) && (curr->registered != 7))
 363                         {
 364                                 log(DEBUG,"InspIRCd: registration timeout: %s",curr->nick);
 365                                 GlobalGoners.AddItem(curr,"Registration timeout");
 366                                 continue;
 367                         }
 368
 369                         /*
 370                          * user has signed on with USER/NICK/PASS, and dns has completed, all the modules
 371                          * say this user is ok to proceed, fully connect them.
 372                          */
 373                         if ((TIME > curr->signon) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 374                         {
 375                                 curr->dns_done = true;
 376                                 ServerInstance->stats->statsDnsBad++;
 377                                 FullConnectUser(curr,&GlobalGoners);
 378                                 continue;
 379                         }
 380
 381                         if ((curr->dns_done) && (curr->registered == 3) && (AllModulesReportReady(curr)))
 382                         {
 383                                 log(DEBUG,"dns done, registered=3, and modules ready, OK");
 384                                 FullConnectUser(curr,&GlobalGoners);
 385                                 continue;
 386                         }
 387
 388                         // It's time to PING this user. Send them a ping.
 389                         if ((TIME > curr->nping) && (curr->registered == 7))
 390                         {
 391                                 // This user didn't answer the last ping, remove them
 392                                 if (!curr->lastping)
 393                                 {
 394                                         GlobalGoners.AddItem(curr,"Ping timeout");
 395                                         continue;
 396                                 }
 397
 398                                 Write(curr->fd,"PING :%s",Config->ServerName);
 399                                 curr->lastping = 0;
 400                                 curr->nping = TIME+curr->pingmax;
 401                         }
 402
 403                         /*
 404                          * We can flush the write buffer as the last thing we do, because if they
 405                          * match any of the above conditions its no use flushing their buffer anyway.
 406                          */
 407                         curr->FlushWriteBuf();
 408
 409                         if (*curr->GetWriteError())
 410                         {
 411                                 GlobalGoners.AddItem(curr,curr->GetWriteError());
 412                                 continue;
 413                         }
 414                 }
 415         }
 416
 417         /* Remove all the queued users who are due to be quit, free memory used. */
 418         GlobalGoners.Apply();
 419 }