1 /* +------------------------------------+
\r * | Inspire Internet Relay Chat Daemon |
\r * +------------------------------------+
\r *
\r * InspIRCd: (C) 2002-2007 InspIRCd Development Team
\r * See: http://www.inspircd.org/wiki/index.php/Credits
\r *
\r * This program is free but copyrighted software; see
\r * the file COPYING for details.
\r *
\r * ---------------------------------------------------
\r */
\r\r#include "inspircd.h"
\r#include "users.h"
\r#include "channels.h"
\r#include "modules.h"
\r\r/* $ModDesc: Provides support for RFC 1413 ident lookups */
\r\r// Version 1.5.0.0 - Updated to use InspSocket, faster and neater.
\r\r/** Handles RFC1413 ident connections to users
\r */
\rclass RFC1413 : public InspSocket
\r{
\r protected:
\r socklen_t uslen; // length of our port number
\r socklen_t themlen; // length of their port number
\r char ident_request[128]; // buffer used to make up the request string
\r public:
\r\r userrec* u; // user record that the lookup is associated with
\r int ufd;
\r\r RFC1413(InspIRCd* SI, userrec* user, int maxtime, const std::string &bindto) : InspSocket(SI, user->GetIPString(), 113, false, maxtime, bindto), u(user)
\r {
\r ufd = user->GetFd();
\r }
\r\r virtual void OnTimeout()
\r {
\r // When we timeout, the connection failed within the allowed timeframe,
\r // so we just display a notice, and tidy off the ident_data.
\r if (u && (Instance->SE->GetRef(ufd) == u))
\r {
\r u->Shrink("ident_data");
\r Instance->next_call = Instance->Time();
\r }
\r }
\r\r virtual bool OnDataReady()
\r {
\r char* ibuf = this->Read();
\r if (ibuf)
\r {
\r char* savept;
\r char* section = strtok_r(ibuf,":",&savept);
\r while (section)
\r {
\r if (strstr(section,"USERID"))
\r {
\r section = strtok_r(NULL,":",&savept);
\r if (section)
\r {
\r // ID type, usually UNIX or OTHER... we dont want it, so read the next token
\r section = strtok_r(NULL,":",&savept);
\r if (section)
\r {
\r while (*section == ' ') section++; // strip leading spaces
\r for (char* j = section; *j; j++)
\r if ((*j < 33) || (*j > 126))
\r *j = '\0'; // truncate at invalid chars
\r if (*section)
\r {
\r if (u && (Instance->SE->GetRef(ufd) == u))
\r {
\r if (this->Instance->IsIdent(section))
\r {
\r u->Extend("IDENT", new std::string(std::string(section) + "," + std::string(u->ident)));
\r strlcpy(u->ident,section,IDENTMAX);
\r u->WriteServ("NOTICE "+std::string(u->nick)+" :*** Found your ident: "+std::string(u->ident));
\r }
\r }
\r }
\r return false;
\r }
\r }
\r }
\r section = strtok_r(NULL,":",&savept);
\r }
\r }
\r return false;
\r }
\r\r virtual void OnClose()
\r {
\r // tidy up after ourselves when the connection is done.
\r // We receive this event straight after a timeout, too.
\r //
\r //
\r // OK, now listen up. The weird looking check here is
\r // REQUIRED. Don't try and optimize it away.
\r //
\r // When a socket is closed, it is not immediately removed
\r // from the socket list, there can be a short delay
\r // before it is culled from the list. This means that
\r // without this check, there is a chance that a user
\r // may not exist when we come to ::Shrink them, which
\r // results in a segfault. The value of "u" may not
\r // always be NULL at this point, so, what we do is
\r // check against the fd_ref_table, to see if (1) the user
\r // exists, and (2) its the SAME user, on the same file
\r // descriptor that they were when the lookup began.
\r //
\r // Fixes issue reported by webs, 7 Jun 2006
\r if (u && (Instance->SE->GetRef(ufd) == u))
\r {
\r Instance->next_call = Instance->Time();
\r u->Shrink("ident_data");
\r }
\r }
\r\r virtual void OnError(InspSocketError e)
\r {
\r if (u && (Instance->SE->GetRef(ufd) == u))
\r {
\r if (*u->ident == '~')
\r u->WriteServ("NOTICE "+std::string(u->nick)+" :*** Could not find your ident, using "+std::string(u->ident)+" instead.");
\r\r Instance->next_call = Instance->Time();
\r u->Shrink("ident_data");
\r }
\r }
\r\r virtual bool OnConnected()
\r {
\r if (u && (Instance->SE->GetRef(ufd) == u))
\r {
\r sockaddr* sock_us = new sockaddr[2];
\r sockaddr* sock_them = new sockaddr[2];
\r bool success = false;
\r uslen = sizeof(sockaddr_in);
\r themlen = sizeof(sockaddr_in);
\r#ifdef IPV6
\r if (this->u->GetProtocolFamily() == AF_INET6)
\r {
\r themlen = sizeof(sockaddr_in6);
\r uslen = sizeof(sockaddr_in6);
\r }
\r#endif
\r success = ((getsockname(this->u->GetFd(),sock_us,&uslen) || getpeername(this->u->GetFd(), sock_them, &themlen)));
\r if (success)
\r {
\r delete[] sock_us;
\r delete[] sock_them;
\r return false;
\r }
\r else
\r {
\r // send the request in the following format: theirsocket,oursocket
\r#ifdef IPV6
\r if (this->u->GetProtocolFamily() == AF_INET6)
\r snprintf(ident_request,127,"%d,%d\r\n",ntohs(((sockaddr_in6*)sock_them)->sin6_port),ntohs(((sockaddr_in6*)sock_us)->sin6_port));
\r else
\r#endif
\r snprintf(ident_request,127,"%d,%d\r\n",ntohs(((sockaddr_in*)sock_them)->sin_port),ntohs(((sockaddr_in*)sock_us)->sin_port));
\r this->Write(ident_request);
\r delete[] sock_us;
\r delete[] sock_them;
\r return true;
\r }
\r }
\r else
\r {
\r Instance->next_call = Instance->Time();
\r return true;
\r }
\r }
\r};
\r\rclass ModuleIdent : public Module
\r{
\r\r ConfigReader* Conf;
\r int IdentTimeout;
\r std::string PortBind;
\r\r public:
\r void ReadSettings()
\r {
\r Conf = new ConfigReader(ServerInstance);
\r IdentTimeout = Conf->ReadInteger("ident", "timeout", 0, true);
\r PortBind = Conf->ReadValue("ident", "bind", 0);
\r if (!IdentTimeout)
\r IdentTimeout = 1;
\r DELETE(Conf);
\r }
\r\r ModuleIdent(InspIRCd* Me)
\r : Module(Me)
\r {
\r\r ReadSettings();
\r }
\r\r void Implements(char* List)
\r {
\r List[I_OnCleanup] = List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCheckReady] = List[I_OnUserDisconnect] = 1;
\r }
\r\r void OnSyncUserMetaData(userrec* user, Module* proto,void* opaque, const std::string &extname, bool displayable)
\r {
\r if ((displayable) && (extname == "IDENT"))
\r {
\r std::string* ident;
\r if (GetExt("IDENT", ident))
\r proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *ident);
\r }
\r }
\r\r\r virtual void OnRehash(userrec* user, const std::string ¶meter)
\r {
\r ReadSettings();
\r }
\r\r virtual int OnUserRegister(userrec* user)
\r {
\r /*
\r * when the new user connects, before they authenticate with USER/NICK/PASS, we do
\r * their ident lookup. We do this by instantiating an object of type RFC1413, which
\r * is derived from InspSocket, and inserting it into the socket engine using the
\r * Server::AddSocket() call.
\r */
\r char newident[MAXBUF];
\r strcpy(newident,"~");
\r strlcat(newident,user->ident,IDENTMAX);
\r strlcpy(user->ident,newident,IDENTMAX);
\r \r\r user->WriteServ("NOTICE "+std::string(user->nick)+" :*** Looking up your ident...");
\r RFC1413* ident = new RFC1413(ServerInstance, user, IdentTimeout, PortBind);
\r if ((ident->GetState() == I_CONNECTING) || (ident->GetState() == I_CONNECTED))
\r {
\r user->Extend("ident_data", (char*)ident);
\r }
\r else
\r {
\r user->WriteServ("NOTICE "+std::string(user->nick)+" :*** Could not find your ident, using "+std::string(user->ident)+" instead.");
\r ServerInstance->next_call = ServerInstance->Time();
\r }
\r return 0;
\r }
\r\r virtual bool OnCheckReady(userrec* user)
\r {
\r /*
\r * The socket engine will clean up their ident request for us when it completes,
\r * either due to timeout or due to closing, so, we just hold them until they dont
\r * have an ident field any more.
\r */
\r RFC1413* ident;
\r return (!user->GetExt("ident_data", ident));
\r }
\r\r virtual void OnCleanup(int target_type, void* item)
\r {
\r if (target_type == TYPE_USER)
\r {
\r userrec* user = (userrec*)item;
\r RFC1413* ident;
\r std::string* identstr;
\r if (user->GetExt("ident_data", ident))
\r {
\r // FIX: If the user record is deleted, the socket wont be removed
\r // immediately so there is chance of the socket trying to write to
\r // a user which has now vanished! To prevent this, set ident::u
\r // to NULL and check it so that we dont write users who have gone away.
\r ident->u = NULL;
\r ServerInstance->SE->DelFd(ident);
\r //delete ident;
\r }
\r if (user->GetExt("IDENT", identstr))
\r {
\r delete identstr;
\r }
\r }
\r }
\r\r virtual void OnUserDisconnect(userrec* user)
\r {
\r /*
\r * when the user quits tidy up any ident lookup they have pending to keep things tidy.
\r * When we call RemoveSocket, the abstractions tied into the system evnetually work their
\r * way to RFC1459::OnClose(), which shrinks off the ident_data for us, so we dont need
\r * to do it here. If we don't tidy this up, there may still be lingering idents for users
\r * who have quit, as class RFC1459 is only loosely bound to userrec* via a pair of pointers
\r * and this would leave at least one of the invalid ;)
\r */
\r RFC1413* ident;
\r std::string* identstr;
\r if (user->GetExt("ident_data", ident))
\r {
\r ident->u = NULL;
\r ServerInstance->SE->DelFd(ident);
\r }
\r if (user->GetExt("IDENT", identstr))
\r {
\r delete identstr;
\r }
\r }
\r\r virtual ~ModuleIdent()
\r {
\r ServerInstance->next_call = ServerInstance->Time();
\r }
\r\r virtual Version GetVersion()
\r {
\r return Version(1,1,0,0,VF_VENDOR,API_VERSION);
\r }
\r\r};
\r\rMODULE_INIT(ModuleIdent)
\r
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