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* Srv;             // Server* class used for core communications
  34         userrec* u;              // user record that the lookup is associated with
  35         sockaddr_in sock_us;     // our port number
  36         sockaddr_in sock_them;   // their port number
  37         socklen_t uslen;         // length of our port number
  38         socklen_t themlen;       // length of their port number
  39         char ident_request[128]; // buffer used to make up the request string
  40  public:
  41
  42         RFC1413(userrec* user, int maxtime, Server* S) : InspSocket(user->host, 113, false, maxtime), Srv(S), u(user)
  43         {
  44                 Srv->Log(DEBUG,"Ident: associated.");
  45         }
  46
  47         virtual void OnTimeout()
  48         {
  49                 // When we timeout, the connection failed within the allowed timeframe,
  50                 // so we just display a notice, and tidy off the ident_data.
  51                 u->Shrink("ident_data");
  52                 Srv->SendServ(u->fd,"NOTICE "+std::string(u->nick)+" :*** Could not find your ident, using "+std::string(u->ident)+" instead.");
  53         }
  54
  55         virtual bool OnDataReady()
  56         {
  57                 char* ibuf = this->Read();
  58                 if (ibuf)
  59                 {
  60                         char* savept;
  61                         char* section = strtok_r(ibuf,":",&savept);
  62                         while (section)
  63                         {
  64                                 if (strstr(section,"USERID"))
  65                                 {
  66                                         section = strtok_r(NULL,":",&savept);
  67                                         if (section)
  68                                         {
  69                                                 // ID type, usually UNIX or OTHER... we dont want it, so read the next token
  70                                                 section = strtok_r(NULL,":",&savept);
  71                                                 if (section)
  72                                                 {
  73                                                         while (*section == ' ') section++; // strip leading spaces
  74                                                         int t = strlen(section);
  75                                                         for (int j = 0; j < t; j++)
  76                                                         if ((section[j] < 33) || (section[j]>126))
  77                                                                 section[j] = '\0'; // truncate at invalid chars
  78                                                         if (strlen(section))
  79                                                         {
  80                                                                 strlcpy(u->ident,section,IDENTMAX);
  81                                                                 Srv->Log(DEBUG,"IDENT SET: "+std::string(u->ident));
  82                                                                 Srv->SendServ(u->fd,"NOTICE "+std::string(u->nick)+" :*** Found your ident: "+std::string(u->ident));
  83                                                         }
  84                                                         return false;
  85                                                 }
  86                                         }
  87                                 }
  88                                 section = strtok_r(NULL,":",&savept);
  89                         }
  90                 }
  91                 return false;
  92         }
  93
  94         virtual void OnClose()
  95         {
  96                 // tidy up after ourselves when the connection is done.
  97                 // We receive this event straight after a timeout, too.
  98                 u->Shrink("ident_data");
  99         }
 100
 101         virtual void OnError(InspSocketError e)
 102         {
 103                 u->Shrink("ident_data");
 104         }
 105
 106         virtual bool OnConnected()
 107         {
 108                 uslen = sizeof(sock_us);
 109                 themlen = sizeof(sock_them);
 110                 if ((getsockname(this->u->fd,(sockaddr*)&sock_us,&uslen) || getpeername(this->u->fd, (sockaddr*)&sock_them, &themlen)))
 111                 {
 112                         Srv->Log(DEBUG,"Ident: failed to get socket names, bailing");
 113                         return false;
 114                 }
 115                 else
 116                 {
 117                         // send the request in the following format: theirsocket,oursocket
 118                         snprintf(ident_request,127,"%d,%d\r\n",ntohs(sock_them.sin_port),ntohs(sock_us.sin_port));
 119                         this->Write(ident_request);
 120                         Srv->Log(DEBUG,"Sent ident request, waiting for reply");
 121                         return true;
 122                 }
 123         }
 124 };
 125
 126 class ModuleIdent : public Module
 127 {
 128
 129         ConfigReader* Conf;
 130         Server* Srv;
 131         int IdentTimeout;
 132
 133  public:
 134         void ReadSettings()
 135         {
 136                 Conf = new ConfigReader;
 137                 IdentTimeout = Conf->ReadInteger("ident","timeout",0,true);
 138                 if (!IdentTimeout)
 139                         IdentTimeout = 1;
 140                 delete Conf;
 141         }
 142
 143         ModuleIdent(Server* Me)
 144                 : Module::Module(Me)
 145         {
 146                 Srv = Me;
 147                 ReadSettings();
 148         }
 149
 150         void Implements(char* List)
 151         {
 152                 List[I_OnCleanup] = List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCheckReady] = List[I_OnUserDisconnect] = 1;
 153         }
 154
 155         virtual void OnRehash(std::string parameter)
 156         {
 157                 ReadSettings();
 158         }
 159
 160         virtual void OnUserRegister(userrec* user)
 161         {
 162                 // when the new user connects, before they authenticate with USER/NICK/PASS, we do
 163                 // their ident lookup. We do this by instantiating an object of type RFC1413, which
 164                 // is derived from InspSocket, and inserting it into the socket engine using the
 165                 // Server::AddSocket() call.
 166                 Srv->SendServ(user->fd,"NOTICE "+std::string(user->nick)+" :*** Looking up your ident...");
 167                 RFC1413* ident = new RFC1413(user, IdentTimeout, Srv);
 168                 if (ident->GetState() != I_ERROR)
 169                 {
 170                         user->Extend("ident_data", (char*)ident);
 171                         Srv->AddSocket(ident);
 172                 }
 173                 else
 174                 {
 175                         Srv->SendServ(user->fd,"NOTICE "+std::string(user->nick)+" :*** Could not find your ident, using "+std::string(user->ident)+" instead.");
 176                         delete ident;
 177                 }
 178         }
 179
 180         virtual bool OnCheckReady(userrec* user)
 181         {
 182                 // The socket engine will clean up their ident request for us when it completes,
 183                 // either due to timeout or due to closing, so, we just hold them until they dont
 184                 // have an ident field any more.
 185                 RFC1413* ident = (RFC1413*)user->GetExt("ident_data");
 186                 return (!ident);
 187         }
 188
 189         virtual void OnCleanup(int target_type, void* item)
 190         {
 191                 if (target_type == TYPE_USER)
 192                 {
 193                         userrec* user = (userrec*)item;
 194                         RFC1413* ident = (RFC1413*)user->GetExt("ident_data");
 195                         if (ident)
 196                         {
 197                                 Srv->RemoveSocket(ident);
 198                         }
 199                 }
 200         }
 201
 202         virtual void OnUserDisconnect(userrec* user)
 203         {
 204                 // when the user quits tidy up any ident lookup they have pending to keep things tidy.
 205                 // When we call RemoveSocket, the abstractions tied into the system evnetually work their
 206                 // way to RFC1459::OnClose(), which shrinks off the ident_data for us, so we dont need
 207                 // to do it here. If we don't tidy this up, there may still be lingering idents for users
 208                 // who have quit, as class RFC1459 is only loosely bound to userrec* via a pair of pointers
 209                 // and this would leave at least one of the invalid ;)
 210                 RFC1413* ident = (RFC1413*)user->GetExt("ident_data");
 211                 if (ident)
 212                 {
 213                         Srv->RemoveSocket(ident);
 214                 }
 215         }
 216
 217         virtual ~ModuleIdent()
 218         {
 219         }
 220
 221         virtual Version GetVersion()
 222         {
 223                 return Version(1,5,0,0,VF_VENDOR);
 224         }
 225
 226 };
 227
 228 class ModuleIdentFactory : public ModuleFactory
 229 {
 230  public:
 231         ModuleIdentFactory()
 232         {
 233         }
 234
 235         ~ModuleIdentFactory()
 236         {
 237         }
 238
 239         virtual Module * CreateModule(Server* Me)
 240         {
 241                 return new ModuleIdent(Me);
 242         }
 243
 244 };
 245
 246
 247 extern "C" void * init_module( void )
 248 {
 249         return new ModuleIdentFactory;
 250 }
 251