src/modules/m_ident.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include <stdio.h>
  15 #include <string>
  16 #include "users.h"
  17 #include "channels.h"
  18 #include "modules.h"
  19 #include "inspircd.h"
  20
  21 /* $ModDesc: Provides support for RFC 1413 ident lookups */
  22
  23 // Version 1.5.0.0 - Updated to use InspSocket, faster and neater.
  24
  25 /** Handles RFC1413 ident connections to users
  26  */
  27 class RFC1413 : public InspSocket
  28 {
  29  protected:
  30         socklen_t uslen;         // length of our port number
  31         socklen_t themlen;       // length of their port number
  32         char ident_request[128]; // buffer used to make up the request string
  33  public:
  34
  35         userrec* u;              // user record that the lookup is associated with
  36         int ufd;
  37
  38         RFC1413(InspIRCd* SI, userrec* user, int maxtime) : InspSocket(SI, user->GetIPString(), 113, false, maxtime), u(user)
  39         {
  40                 ufd = user->GetFd();
  41         }
  42
  43         virtual void OnTimeout()
  44         {
  45                 // When we timeout, the connection failed within the allowed timeframe,
  46                 // so we just display a notice, and tidy off the ident_data.
  47                 if (u && (Instance->SE->GetRef(ufd) == u))
  48                 {
  49                         u->Shrink("ident_data");
  50                         Instance->next_call = Instance->Time();
  51                 }
  52         }
  53
  54         virtual bool OnDataReady()
  55         {
  56                 char* ibuf = this->Read();
  57                 if (ibuf)
  58                 {
  59                         char* savept;
  60                         char* section = strtok_r(ibuf,":",&savept);
  61                         while (section)
  62                         {
  63                                 if (strstr(section,"USERID"))
  64                                 {
  65                                         section = strtok_r(NULL,":",&savept);
  66                                         if (section)
  67                                         {
  68                                                 // ID type, usually UNIX or OTHER... we dont want it, so read the next token
  69                                                 section = strtok_r(NULL,":",&savept);
  70                                                 if (section)
  71                                                 {
  72                                                         while (*section == ' ') section++; // strip leading spaces
  73                                                         for (char* j = section; *j; j++)
  74                                                         if ((*j < 33) || (*j > 126))
  75                                                                 *j = '\0'; // truncate at invalid chars
  76                                                         if (*section)
  77                                                         {
  78                                                                 if (u && (Instance->SE->GetRef(ufd) == u))
  79                                                                 {
  80                                                                         if (this->Instance->IsIdent(section))
  81                                                                         {
  82                                                                                 u->Extend("IDENT", new std::string(std::string(section) + "," + std::string(u->ident)));
  83                                                                                 strlcpy(u->ident,section,IDENTMAX);
  84                                                                                 u->WriteServ("NOTICE "+std::string(u->nick)+" :*** Found your ident: "+std::string(u->ident));
  85                                                                         }
  86                                                                 }
  87                                                         }
  88                                                         return false;
  89                                                 }
  90                                         }
  91                                 }
  92                                 section = strtok_r(NULL,":",&savept);
  93                         }
  94                 }
  95                 return false;
  96         }
  97
  98         virtual void OnClose()
  99         {
 100                 // tidy up after ourselves when the connection is done.
 101                 // We receive this event straight after a timeout, too.
 102                 //
 103                 //
 104                 // OK, now listen up. The weird looking check here is
 105                 // REQUIRED. Don't try and optimize it away.
 106                 //
 107                 // When a socket is closed, it is not immediately removed
 108                 // from the socket list, there can be a short delay
 109                 // before it is culled from the list. This means that
 110                 // without this check, there is a chance that a user
 111                 // may not exist when we come to ::Shrink them, which
 112                 // results in a segfault. The value of "u" may not
 113                 // always be NULL at this point, so, what we do is
 114                 // check against the fd_ref_table, to see if (1) the user
 115                 // exists, and (2) its the SAME user, on the same file
 116                 // descriptor that they were when the lookup began.
 117                 //
 118                 // Fixes issue reported by webs, 7 Jun 2006
 119                 if (u && (Instance->SE->GetRef(ufd) == u))
 120                 {
 121                         Instance->next_call = Instance->Time();
 122                         u->Shrink("ident_data");
 123                 }
 124         }
 125
 126         virtual void OnError(InspSocketError e)
 127         {
 128                 if (u && (Instance->SE->GetRef(ufd) == u))
 129                 {
 130                         if (*u->ident == '~')
 131                                 u->WriteServ("NOTICE "+std::string(u->nick)+" :*** Could not find your ident, using "+std::string(u->ident)+" instead.");
 132
 133                         Instance->next_call = Instance->Time();
 134                         u->Shrink("ident_data");
 135                 }
 136         }
 137
 138         virtual bool OnConnected()
 139         {
 140                 if (u && (Instance->SE->GetRef(ufd) == u))
 141                 {
 142                         sockaddr* sock_us = new sockaddr[2];
 143                         sockaddr* sock_them = new sockaddr[2];
 144                         bool success = false;
 145                         uslen = sizeof(sockaddr_in);
 146                         themlen = sizeof(sockaddr_in);
 147 #ifdef IPV6
 148                         if (this->u->GetProtocolFamily() == AF_INET6)
 149                         {
 150                                 themlen = sizeof(sockaddr_in6);
 151                                 uslen = sizeof(sockaddr_in6);
 152                                 success = ((getsockname(this->u->GetFd(),sock_us,&uslen) || getpeername(this->u->GetFd(), sock_them, &themlen)));
 153                         }
 154                         else
 155                                 success = ((getsockname(this->u->GetFd(),sock_us,&uslen) || getpeername(this->u->GetFd(), sock_them, &themlen)));
 156 #else
 157                         success = ((getsockname(this->u->GetFd(),sock_us,&uslen) || getpeername(this->u->GetFd(), sock_them, &themlen)));
 158 #endif
 159                         if (success)
 160                         {
 161                                 delete[] sock_us;
 162                                 delete[] sock_them;
 163                                 return false;
 164                         }
 165                         else
 166                         {
 167                                 // send the request in the following format: theirsocket,oursocket
 168 #ifdef IPV6
 169                                 if (this->u->GetProtocolFamily() == AF_INET6)
 170                                         snprintf(ident_request,127,"%d,%d\r\n",ntohs(((sockaddr_in6*)sock_them)->sin6_port),ntohs(((sockaddr_in6*)sock_us)->sin6_port));
 171                                 else
 172                                         snprintf(ident_request,127,"%d,%d\r\n",ntohs(((sockaddr_in*)sock_them)->sin_port),ntohs(((sockaddr_in*)sock_us)->sin_port));
 173 #else
 174                                 snprintf(ident_request,127,"%d,%d\r\n",ntohs(((sockaddr_in*)sock_them)->sin_port),ntohs(((sockaddr_in*)sock_us)->sin_port));
 175 #endif
 176                                 this->Write(ident_request);
 177                                 delete[] sock_us;
 178                                 delete[] sock_them;
 179                                 return true;
 180                         }
 181                 }
 182                 else
 183                 {
 184                         Instance->next_call = Instance->Time();
 185                         return true;
 186                 }
 187         }
 188 };
 189
 190 class ModuleIdent : public Module
 191 {
 192
 193         ConfigReader* Conf;
 194
 195         int IdentTimeout;
 196
 197  public:
 198         void ReadSettings()
 199         {
 200                 Conf = new ConfigReader(ServerInstance);
 201                 IdentTimeout = Conf->ReadInteger("ident","timeout",0,true);
 202                 if (!IdentTimeout)
 203                         IdentTimeout = 1;
 204                 DELETE(Conf);
 205         }
 206
 207         ModuleIdent(InspIRCd* Me)
 208                 : Module(Me)
 209         {
 210
 211                 ReadSettings();
 212         }
 213
 214         void Implements(char* List)
 215         {
 216                 List[I_OnCleanup] = List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCheckReady] = List[I_OnUserDisconnect] = 1;
 217         }
 218
 219         void OnSyncUserMetaData(userrec* user, Module* proto,void* opaque, const std::string &extname, bool displayable)
 220         {
 221                 if ((displayable) && (extname == "IDENT"))
 222                 {
 223                         std::string* ident;
 224                         if (GetExt("IDENT", ident))
 225                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *ident);
 226                 }
 227         }
 228
 229
 230         virtual void OnRehash(userrec* user, const std::string &parameter)
 231         {
 232                 ReadSettings();
 233         }
 234
 235         virtual int OnUserRegister(userrec* user)
 236         {
 237                 /*
 238                  * when the new user connects, before they authenticate with USER/NICK/PASS, we do
 239                  * their ident lookup. We do this by instantiating an object of type RFC1413, which
 240                  * is derived from InspSocket, and inserting it into the socket engine using the
 241                  * Server::AddSocket() call.
 242                  */
 243                 char newident[MAXBUF];
 244                 strcpy(newident,"~");
 245                 strlcat(newident,user->ident,IDENTMAX);
 246                 strlcpy(user->ident,newident,IDENTMAX);
 247
 248
 249                 user->WriteServ("NOTICE "+std::string(user->nick)+" :*** Looking up your ident...");
 250                 RFC1413* ident = new RFC1413(ServerInstance, user, IdentTimeout);
 251                 if ((ident->GetState() == I_CONNECTING) || (ident->GetState() == I_CONNECTED))
 252                 {
 253                         user->Extend("ident_data", (char*)ident);
 254                 }
 255                 else
 256                 {
 257                         user->WriteServ("NOTICE "+std::string(user->nick)+" :*** Could not find your ident, using "+std::string(user->ident)+" instead.");
 258                         ServerInstance->next_call = ServerInstance->Time();
 259                 }
 260                 return 0;
 261         }
 262
 263         virtual bool OnCheckReady(userrec* user)
 264         {
 265                 /*
 266                  * The socket engine will clean up their ident request for us when it completes,
 267                  * either due to timeout or due to closing, so, we just hold them until they dont
 268                  * have an ident field any more.
 269                  */
 270                 RFC1413* ident;
 271                 return (!user->GetExt("ident_data", ident));
 272         }
 273
 274         virtual void OnCleanup(int target_type, void* item)
 275         {
 276                 if (target_type == TYPE_USER)
 277                 {
 278                         userrec* user = (userrec*)item;
 279                         RFC1413* ident;
 280                         std::string* identstr;
 281                         if (user->GetExt("ident_data", ident))
 282                         {
 283                                 // FIX: If the user record is deleted, the socket wont be removed
 284                                 // immediately so there is chance of the socket trying to write to
 285                                 // a user which has now vanished! To prevent this, set ident::u
 286                                 // to NULL and check it so that we dont write users who have gone away.
 287                                 ident->u = NULL;
 288                                 ServerInstance->SE->DelFd(ident);
 289                                 //delete ident;
 290                         }
 291                         if (user->GetExt("IDENT", identstr))
 292                         {
 293                                 delete identstr;
 294                         }
 295                 }
 296         }
 297
 298         virtual void OnUserDisconnect(userrec* user)
 299         {
 300                 /*
 301                  * when the user quits tidy up any ident lookup they have pending to keep things tidy.
 302                  * When we call RemoveSocket, the abstractions tied into the system evnetually work their
 303                  * way to RFC1459::OnClose(), which shrinks off the ident_data for us, so we dont need
 304                  * to do it here. If we don't tidy this up, there may still be lingering idents for users
 305                  * who have quit, as class RFC1459 is only loosely bound to userrec* via a pair of pointers
 306                  * and this would leave at least one of the invalid ;)
 307                  */
 308                 RFC1413* ident;
 309                 std::string* identstr;
 310                 if (user->GetExt("ident_data", ident))
 311                 {
 312                         ident->u = NULL;
 313                         ServerInstance->SE->DelFd(ident);
 314                 }
 315                 if (user->GetExt("IDENT", identstr))
 316                 {
 317                         delete identstr;
 318                 }
 319         }
 320
 321         virtual ~ModuleIdent()
 322         {
 323                 ServerInstance->next_call = ServerInstance->Time();
 324         }
 325
 326         virtual Version GetVersion()
 327         {
 328                 return Version(1,1,0,0,VF_VENDOR,API_VERSION);
 329         }
 330
 331 };
 332
 333 class ModuleIdentFactory : public ModuleFactory
 334 {
 335  public:
 336         ModuleIdentFactory()
 337         {
 338         }
 339
 340         ~ModuleIdentFactory()
 341         {
 342         }
 343
 344         virtual Module * CreateModule(InspIRCd* Me)
 345         {
 346                 return new ModuleIdent(Me);
 347         }
 348
 349 };
 350
 351
 352 extern "C" DllExport void * init_module( void )
 353 {
 354         return new ModuleIdentFactory;
 355 }
 356