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// Hostname cloaking (+x mode) module for inspircd.
// version 1.0.0.1 by brain (C. J. Edwards) Mar 2004.
//
// When loaded this module will automatically set the
// +x mode on all connecting clients.
//
// Setting +x on a client causes the module to change the
// dhost entry (displayed host) for each user who has the
// mode, cloaking their host. Unlike unreal, the algorithm
// is non-reversible as uncloaked hosts are passed along
// the server->server link, and all encoding of hosts is
// done locally on the server by this module.
#include <stdio.h>
#include "users.h"
#include "channels.h"
#include "modules.h"
/* $ModDesc: Provides masking of user hostnames */
class ModuleCloaking : public Module
{
private:
Server *Srv;
public:
ModuleCloaking()
{
// We must create an instance of the Server class to work with
Srv = new Server;
// we must create a new mode. Set the parameters so the
// mode doesn't require oper, and is a client usermode
// with no parameters (actually, you cant have params for a umode!)
if (!Srv->AddExtendedMode('x',MT_CLIENT,false,0,0))
{
// we couldn't claim mode x... possibly anther module has it,
// this might become likely to happen if there are a lot of 3rd
// party modules around in the future -- any 3rd party modules
// SHOULD implement a system of configurable mode letters (e.g.
// from a config file)
Srv->Log(DEFAULT,"*** m_cloaking: ERROR, failed to allocate user mode +x!");
printf("Could not claim usermode +x for this module!");
exit(0);
}
}
virtual ~ModuleCloaking()
{
// not really neccessary, but free it anyway
delete Srv;
}
virtual Version GetVersion()
{
// returns the version number of the module to be
// listed in /MODULES
return Version(1,0,0,1);
}
virtual int OnExtendedMode(userrec* user, void* target, char modechar, int type, bool mode_on, string_list ¶ms)
{
// this method is called for any extended mode character.
// all module modes for all modules pass through here
// (unless another module further up the chain claims them)
// so we must be VERY careful to only act upon modes which
// we have claimed ourselves. This is a feature to allow
// modules to 'spy' on extended mode activity if they so wish.
if ((modechar == 'x') && (type == MT_CLIENT))
{
// OnExtendedMode gives us a void* as the target, we must cast
// it into a userrec* or a chanrec* depending on the value of
// the 'type' parameter (MT_CLIENT or MT_CHANNEL)
userrec* dest = (userrec*)target;
// we've now determined that this is our mode character...
// is the user adding the mode to their list or removing it?
if (mode_on)
{
// the mode is being turned on - so attempt to
// allocate the user a cloaked host using a non-reversible
// algorithm (its simple, but its non-reversible so the
// simplicity doesnt really matter). This algorithm
// will not work if the user has only one level of domain
// naming in their hostname (e.g. if they are on a lan or
// are connecting via localhost) -- this doesnt matter much.
if (strchr(dest->host,'.'))
{
// in inspircd users have two hostnames. A displayed
// hostname which can be modified by modules (e.g.
// to create vhosts, implement chghost, etc) and a
// 'real' hostname which you shouldnt write to.
std::string a = strstr(dest->host,".");
char ra[64];
long seed,s2;
memcpy(&seed,dest->host,sizeof(long));
memcpy(&s2,a.c_str(),sizeof(long));
sprintf(ra,"%.8X",seed*s2*strlen(dest->host));
std::string b = Srv->GetNetworkName() + "-" + ra + a;
Srv->Log(DEBUG,"cloak: allocated "+b);
Srv->ChangeHost(dest,b);
}
}
else
{
// user is removing the mode, so just restore their real host
// and make it match the displayed one.
Srv->ChangeHost(dest,dest->host);
}
// this mode IS ours, and we have handled it. If we chose not to handle it,
// for example the user cannot cloak as they have a vhost or such, then
// we could return 0 here instead of 1 and the core would not send the mode
// change to the user.
return 1;
}
else
{
// this mode isn't ours, we have to bail and return 0 to not handle it.
return 0;
}
}
virtual void OnUserConnect(userrec* user)
{
// Heres the weird bit. When a user connects we must set +x on them, so
// we're going to use the SendMode method of the Server class to send
// the mode to the client. This is basically the same as sending an
// SAMODE in unreal. Note that to the user it will appear as if they set
// the mode on themselves.
char* modes[2]; // only two parameters
modes[0] = user->nick; // first parameter is the nick
modes[1] = "+x"; // second parameter is the mode
Srv->SendMode(modes,2,user); // send these, forming the command "MODE <nick> +x"
}
};
// stuff down here is the module-factory stuff. For basic modules you can ignore this.
class ModuleCloakingFactory : public ModuleFactory
{
public:
ModuleCloakingFactory()
{
}
~ModuleCloakingFactory()
{
}
virtual Module * CreateModule()
{
return new ModuleCloaking;
}
};
extern "C" void * init_module( void )
{
return new ModuleCloakingFactory;
}
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