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 with user "+std::string(user->nick));
  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                 std::string databuf = this->Read();
  58                 if (databuf != "")
  59                 {
  60                         char ibuf[1024];
  61                         strlcpy(ibuf,databuf.c_str(),1024);
  62                         Srv->Log(DEBUG,"Received ident response");
  63                         char* savept;
  64                         char* section = strtok_r(ibuf,":",&savept);
  65                         while (section)
  66                         {
  67                                 if (strstr(section,"USERID"))
  68                                 {
  69                                         section = strtok_r(NULL,":",&savept);
  70                                         if (section)
  71                                         {
  72                                                 // ID type, usually UNIX or OTHER... we dont want it, so read the next token
  73                                                 section = strtok_r(NULL,":",&savept);
  74                                                 if (section)
  75                                                 {
  76                                                         while (*section == ' ') section++; // strip leading spaces
  77                                                         int t = strlen(section);
  78                                                         for (int j = 0; j < t; j++)
  79                                                         if ((section[j] < 33) || (section[j]>126))
  80                                                                 section[j] = '\0'; // truncate at invalid chars
  81                                                         if (strlen(section))
  82                                                         {
  83                                                                 strlcpy(u->ident,section,IDENTMAX);
  84                                                                 Srv->Log(DEBUG,"IDENT SET: "+std::string(u->ident));
  85                                                                 Srv->SendServ(u->fd,"NOTICE "+std::string(u->nick)+" :*** Found your ident: "+std::string(u->ident));
  86                                                         }
  87                                                         return false;
  88                                                 }
  89                                         }
  90                                 }
  91                                 section = strtok_r(NULL,":",&savept);
  92                         }
  93                 }
  94                 return false;
  95         }
  96
  97         virtual void OnClose()
  98         {
  99                 // tidy up after ourselves when the connection is done.
 100                 // We receive this event straight after a timeout, too.
 101                 u->Shrink("ident_data");
 102         }
 103
 104         virtual bool OnConnected()
 105         {
 106                 uslen = sizeof(sock_us);
 107                 themlen = sizeof(sock_them);
 108                 if ((getsockname(this->u->fd,(sockaddr*)&sock_us,&uslen) || getpeername(this->u->fd, (sockaddr*)&sock_them, &themlen)))
 109                 {
 110                         Srv->Log(DEBUG,"Ident: failed to get socket names, bailing");
 111                         return false;
 112                 }
 113                 else
 114                 {
 115                         // send the request in the following format: theirsocket,oursocket
 116                         snprintf(ident_request,127,"%d,%d\r\n",ntohs(sock_them.sin_port),ntohs(sock_us.sin_port));
 117                         this->Write(ident_request);
 118                         Srv->Log(DEBUG,"Sent ident request, waiting for reply");
 119                         return true;
 120                 }
 121         }
 122 };
 123
 124 class ModuleIdent : public Module
 125 {
 126
 127         ConfigReader* Conf;
 128         Server* Srv;
 129         int IdentTimeout;
 130
 131  public:
 132         void ReadSettings()
 133         {
 134                 Conf = new ConfigReader;
 135                 IdentTimeout = Conf->ReadInteger("ident","timeout",0,true);
 136                 if (!IdentTimeout)
 137                         IdentTimeout = 1;
 138                 delete Conf;
 139         }
 140
 141         ModuleIdent(Server* Me)
 142                 : Module::Module(Me)
 143         {
 144                 Srv = Me;
 145                 ReadSettings();
 146         }
 147
 148         void Implements(char* List)
 149         {
 150                 List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCheckReady] = List[I_OnUserDisconnect] = 1;
 151         }
 152
 153         virtual void OnRehash(std::string parameter)
 154         {
 155                 ReadSettings();
 156         }
 157
 158         virtual void OnUserRegister(userrec* user)
 159         {
 160                 // when the new user connects, before they authenticate with USER/NICK/PASS, we do
 161                 // their ident lookup. We do this by instantiating an object of type RFC1413, which
 162                 // is derived from InspSocket, and inserting it into the socket engine using the
 163                 // Server::AddSocket() call.
 164                 Srv->SendServ(user->fd,"NOTICE "+std::string(user->nick)+" :*** Looking up your ident...");
 165                 RFC1413* ident = new RFC1413(user, IdentTimeout, Srv);
 166                 user->Extend("ident_data", (char*)ident);
 167                 Srv->AddSocket(ident);
 168         }
 169
 170         virtual bool OnCheckReady(userrec* user)
 171         {
 172                 // The socket engine will clean up their ident request for us when it completes,
 173                 // either due to timeout or due to closing, so, we just hold them until they dont
 174                 // have an ident field any more.
 175                 RFC1413* ident = (RFC1413*)user->GetExt("ident_data");
 176                 return (!ident);
 177         }
 178
 179         virtual void OnUserDisconnect(userrec* user)
 180         {
 181                 // when the user quits tidy up any ident lookup they have pending to keep things tidy.
 182                 // When we call RemoveSocket, the abstractions tied into the system evnetually work their
 183                 // way to RFC1459::OnClose(), which shrinks off the ident_data for us, so we dont need
 184                 // to do it here. If we don't tidy this up, there may still be lingering idents for users
 185                 // who have quit, as class RFC1459 is only loosely bound to userrec* via a pair of pointers
 186                 // and this would leave at least one of the invalid ;)
 187                 RFC1413* ident = (RFC1413*)user->GetExt("ident_data");
 188                 if (ident)
 189                 {
 190                         Srv->RemoveSocket(ident);
 191                 }
 192         }
 193
 194         virtual ~ModuleIdent()
 195         {
 196         }
 197
 198         virtual Version GetVersion()
 199         {
 200                 return Version(1,5,0,0,VF_VENDOR);
 201         }
 202
 203 };
 204
 205 class ModuleIdentFactory : public ModuleFactory
 206 {
 207  public:
 208         ModuleIdentFactory()
 209         {
 210         }
 211
 212         ~ModuleIdentFactory()
 213         {
 214         }
 215
 216         virtual Module * CreateModule(Server* Me)
 217         {
 218                 return new ModuleIdent(Me);
 219         }
 220
 221 };
 222
 223
 224 extern "C" void * init_module( void )
 225 {
 226         return new ModuleIdentFactory;
 227 }
 228