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