* ---------------------------------------------------
*/
+using namespace std;
+
#include <stdio.h>
#include <string>
+#include <stdlib.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
#include "users.h"
#include "channels.h"
#include "modules.h"
+#include "inspircd.h"
/* $ModDesc: Provides support for RFC 1413 ident lookups */
Server *Srv;
-
+
+// State engine constants. We have three states,
+// connecting, waiting for data, and finished.
+
+#define IDENT_STATE_CONNECT 1
+#define IDENT_STATE_WAITDATA 2
+#define IDENT_STATE_DONE 3
+
+// Ident lookups are done by attaching an RFC1413 class to the
+// userrec record using the Extensible system.
+// The RFC1413 class is written especially for this module but
+// it should be relatively standalone for anyone else who wishes
+// to have a nonblocking ident lookup in a program :)
+// the class operates on a simple state engine, each state of the
+// connection incrementing a state counter, leading through to
+// a concluding state which terminates the lookup.
+
+class RFC1413
+{
+ protected:
+ int fd; // file descriptor
+ userrec* u; // user record that the lookup is associated with
+ sockaddr_in addr; // address we're connecting to
+ in_addr addy; // binary ip address
+ int state; // state (this class operates on a state engine)
+ char ibuf[MAXBUF]; // input buffer
+ sockaddr_in sock_us; // our port number
+ sockaddr_in sock_them; // their port number
+ socklen_t uslen; // length of our port number
+ socklen_t themlen; // length of their port number
+ int nrecv; // how many bytes we've received
+ time_t timeout_end; // how long until the operation times out
+ bool timeout; // true if we've timed out and should bail
+ char ident_request[128]; // buffer used to make up the request string
+ public:
+
+ // The destructor makes damn sure the socket is freed :)
+
+ ~RFC1413()
+ {
+ if (this->fd != -1)
+ {
+ shutdown(this->fd,2);
+ close(this->fd);
+ this->fd = -1;
+ }
+ }
+
+ // establish an ident connection, maxtime is the time to spend trying
+ // returns true if successful, false if something was catastrophically wrong.
+ // note that failed connects are not reported here but detected in RFC1413::Poll()
+ // as the socket is nonblocking
+
+ bool Connect(userrec* user, int maxtime)
+ {
+ timeout_end = time(NULL)+maxtime;
+ timeout = false;
+ if ((this->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
+ {
+ // theres been a boo-boo... no more fd's left for us, woe is me!
+ Srv->Log(DEBUG,"Ident: socket failed for: "+std::string(user->ip));
+ return false;
+ }
+ inet_aton(user->ip,&addy);
+ addr.sin_family = AF_INET;
+ addr.sin_addr = addy;
+ addr.sin_port = htons(113);
+
+ int flags;
+ flags = fcntl(this->fd, F_GETFL, 0);
+ fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
+
+ if(connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)) == -1)
+ {
+ // theres been an error, but EINPROGRESS just means 'right, im on it, call me later'
+ if (errno != EINPROGRESS)
+ {
+ // ... so that error isnt fatal, like the rest.
+ Srv->Log(DEBUG,"Ident: connect failed for: "+std::string(user->ip));
+ shutdown(this->fd,2);
+ close(this->fd);
+ this->fd = -1;
+ return false;
+ }
+ }
+ Srv->Log(DEBUG,"Ident: successful connect associated with user "+std::string(user->nick));
+ this->u = user;
+ this->state = IDENT_STATE_CONNECT;
+ return true;
+ }
+
+ // Poll the socket to see if we have an ident result, and if we do apply it to the user.
+ // returns false if we cannot poll for some reason (e.g. timeout).
+
+ bool Poll()
+ {
+ if (time(NULL) > timeout_end)
+ {
+ timeout = true;
+ Srv->SendServ(u->fd,"NOTICE "+std::string(u->nick)+" :*** Could not find your ident, using "+std::string(u->ident)+" instead.");
+ shutdown(this->fd,2);
+ close(this->fd);
+ this->fd = -1;
+ return false;
+ }
+ pollfd polls;
+ polls.fd = this->fd;
+ if (state == IDENT_STATE_CONNECT)
+ {
+ // during state IDENT_STATE_CONNECT (leading up to the connect)
+ // we're watching for writeability
+ polls.events = POLLOUT;
+ }
+ else
+ {
+ // the rest of the time we're waiting for data
+ // back on the socket, or a socket close
+ polls.events = POLLIN;
+ }
+ int ret = poll(&polls,1,1);
+
+ if (ret > 0)
+ {
+ switch (this->state)
+ {
+ case IDENT_STATE_CONNECT:
+ uslen = sizeof(sock_us);
+ themlen = sizeof(sock_them);
+ if ((getsockname(this->u->fd,(sockaddr*)&sock_us,&uslen) || getpeername(this->u->fd, (sockaddr*)&sock_them, &themlen)))
+ {
+ Srv->Log(DEBUG,"Ident: failed to get socket names, bailing to state 3");
+ shutdown(this->fd,2);
+ close(this->fd);
+ this->fd = -1;
+ state = IDENT_STATE_DONE;
+ }
+ else
+ {
+ // send the request in the following format: theirsocket,oursocket
+ snprintf(ident_request,127,"%d,%d\r\n",ntohs(sock_them.sin_port),ntohs(sock_us.sin_port));
+ send(this->fd,ident_request,strlen(ident_request),0);
+ Srv->Log(DEBUG,"Sent ident request, moving to state 2");
+ state = IDENT_STATE_WAITDATA;
+ }
+ break;
+ case IDENT_STATE_WAITDATA:
+ nrecv = recv(this->fd,ibuf,sizeof(ibuf),0);
+ if (nrecv > 0)
+ {
+ // we have the response line in the following format:
+ // 6193, 23 : USERID : UNIX : stjohns
+ // 6195, 23 : ERROR : NO-USER
+ ibuf[nrecv] = '\0';
+ Srv->Log(DEBUG,"Received ident response: "+std::string(ibuf));
+ shutdown(this->fd,2);
+ close(this->fd);
+ this->fd = -1;
+ char* savept;
+ char* section = strtok_r(ibuf,":",&savept);
+ while (section)
+ {
+ if (strstr(section,"USERID"))
+ {
+ section = strtok_r(NULL,":",&savept);
+ if (section)
+ {
+ // ID type, usually UNIX or OTHER... we dont want it, so read the next token
+ section = strtok_r(NULL,":",&savept);
+ if (section)
+ {
+ while ((*section == ' ') && (strlen(section)>0)) section++; // strip leading spaces
+ int t = strlen(section);
+ for (int j = 0; j < t; j++)
+ if ((section[j] < 33) || (section[j]>126))
+ section[j] = '\0'; // truncate at invalid chars
+ if (strlen(section))
+ {
+ strlcpy(u->ident,section,IDENTMAX);
+ Srv->Log(DEBUG,"IDENT SET: "+std::string(u->ident));
+ Srv->SendServ(u->fd,"NOTICE "+std::string(u->nick)+" :*** Found your ident: "+std::string(u->ident));
+ }
+ break;
+ }
+ }
+ }
+ section = strtok_r(NULL,":",&savept);
+ }
+ state = IDENT_STATE_DONE;
+ }
+ break;
+ case IDENT_STATE_DONE:
+ shutdown(this->fd,2);
+ close(this->fd);
+ this->fd = -1;
+ Srv->Log(DEBUG,"Ident lookup is complete!");
+ break;
+ default:
+ Srv->Log(DEBUG,"Ident: invalid ident state!!!");
+ break;
+ }
+ }
+ return true;
+ }
+
+ // returns true if the operation is completed,
+ // either due to complete request, or a timeout
+
+ bool Done()
+ {
+ return ((state == IDENT_STATE_DONE) || (timeout == true));
+ }
+};
+
class ModuleIdent : public Module
{
+
+ ConfigReader* Conf;
+ int IdentTimeout;
+
public:
- ModuleIdent()
+ void ReadSettings()
+ {
+ Conf = new ConfigReader;
+ IdentTimeout = Conf->ReadInteger("ident","timeout",0,true);
+ delete Conf;
+ }
+
+ ModuleIdent(Server* Me)
+ : Module::Module(Me)
+ {
+ Srv = Me;
+ ReadSettings();
+ }
+
+ virtual void OnRehash(std::string parameter)
{
- Srv = new Server;
+ ReadSettings();
}
virtual void OnUserRegister(userrec* user)
{
+ // when the new user connects, before they authenticate with USER/NICK/PASS, we do
+ // their ident lookup.
+
+ RFC1413* ident = new RFC1413;
+ Srv->SendServ(user->fd,"NOTICE "+std::string(user->nick)+" :*** Looking up your ident...");
+ if (ident->Connect(user,IdentTimeout))
+ {
+ // attach the object to the user record
+ user->Extend("ident_data",(char*)ident);
+ // start it off polling (always good to have a head start)
+ // because usually connect has completed by now
+ ident->Poll();
+ }
+ else
+ {
+ // something went wrong, call an irc-ambulance!
+ Srv->SendServ(user->fd,"NOTICE "+std::string(user->nick)+" :*** Could not look up your ident.");
+ delete ident;
+ }
}
- virtual bool OnUserReady(userrec* user)
+ virtual bool OnCheckReady(userrec* user)
{
+ RFC1413* ident = (RFC1413*)user->GetExt("ident_data");
+ if (ident)
+ {
+ // this user has a pending ident lookup, poll it
+ ident->Poll();
+ // is it done?
+ if (ident->Done())
+ {
+ // their ident is done, zap the structures
+ Srv->Log(DEBUG,"Ident: removing ident gubbins");
+ user->Shrink("ident_data");
+ delete ident;
+ // ...and send them on their way
+ return true;
+ }
+ // nope, we hold them in this state, they dont go anywhere
+ return false;
+ }
return true;
}
+
+ virtual void OnUserDisconnect(userrec* user)
+ {
+ // when the user quits tidy up any ident lookup they have pending to keep things tidy
+ // and to prevent a memory and FD leaks
+ RFC1413* ident = (RFC1413*)user->GetExt("ident_data");
+ if (ident)
+ {
+ delete ident;
+ user->Shrink("ident_data");
+ }
+ }
virtual ~ModuleIdent()
{
- delete Srv;
}
virtual Version GetVersion()
};
-// stuff down here is the module-factory stuff. For basic modules you can ignore this.
-
class ModuleIdentFactory : public ModuleFactory
{
public:
{
}
- virtual Module * CreateModule()
+ virtual Module * CreateModule(Server* Me)
{
- return new ModuleIdent;
+ return new ModuleIdent(Me);
}
};
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