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