/*kHTTPd -- the next generationPass connections to userspace-daemons*//**************************************************************** *	This program is free software; you can redistribute it and/or modify *	it under the terms of the GNU General Public License as published by *	the Free Software Foundation; either version 2, or (at your option) *	any later version. * *	This program is distributed in the hope that it will be useful, *	but WITHOUT ANY WARRANTY; without even the implied warranty of *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *	GNU General Public License for more details. * *	You should have received a copy of the GNU General Public License *	along with this program; if not, write to the Free Software *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * ****************************************************************//*Purpose:Userspace() hands all requests in the queue to the userspace-daemon, ifsuch beast exists.Return value:	The number of requests that changed status*/#include <linux/kernel.h>#include <linux/errno.h>#include <linux/slab.h>#include <linux/net.h>#include <linux/sched.h>#include <linux/skbuff.h>#include <linux/smp_lock.h>#include <linux/un.h>#include <linux/unistd.h>#include <linux/wait.h>#include <net/ip.h>#include <net/sock.h>#include <net/tcp.h>#include <asm/atomic.h>#include <asm/semaphore.h>#include <asm/processor.h>#include <asm/uaccess.h>#include <linux/file.h>#include "structure.h"#include "prototypes.h"#include "sysctl.h"/* prototypes of local, static functions */static int AddSocketToAcceptQueue(struct socket *sock,const int Port);int Userspace(const int CPUNR){	struct http_request *CurrentRequest,**Prev,*Next;		EnterFunction("Userspace");			CurrentRequest = threadinfo[CPUNR].UserspaceQueue;	Prev = &(threadinfo[CPUNR].UserspaceQueue);		while (CurrentRequest!=NULL)	{		/* Clean-up the waitqueue of the socket.. Bad things happen if		   this is forgotten. */		if (CurrentRequest->sock!=NULL)		{			if ((CurrentRequest->sock!=NULL)&&(CurrentRequest->sock->sk!=NULL))			{				remove_wait_queue(CurrentRequest->sock->sk->sleep,&(CurrentRequest->sleep));			}		} 				if  (AddSocketToAcceptQueue(CurrentRequest->sock,sysctl_khttpd_clientport)>=0)		{						(*Prev) = CurrentRequest->Next;			Next = CurrentRequest->Next;									sock_release(CurrentRequest->sock);			CurrentRequest->sock = NULL;	 /* We no longer own it */						CleanUpRequest(CurrentRequest); 							CurrentRequest = Next;			continue;				}		else /* No userspace-daemon present, or other problems with it */		{			(*Prev) = CurrentRequest->Next;			Next = CurrentRequest->Next;						Send403(CurrentRequest->sock); /* Sorry, no go... */						CleanUpRequest(CurrentRequest); 							CurrentRequest = Next;			continue;				}				Prev = &(CurrentRequest->Next);			CurrentRequest = CurrentRequest->Next;	}		LeaveFunction("Userspace");	return 0;}void StopUserspace(const int CPUNR){	struct http_request *CurrentRequest,*Next;		EnterFunction("StopUserspace");	CurrentRequest = threadinfo[CPUNR].UserspaceQueue;	while (CurrentRequest!=NULL)	{		Next= CurrentRequest->Next;		CleanUpRequest(CurrentRequest);		CurrentRequest=Next;			}	threadinfo[CPUNR].UserspaceQueue = NULL;		LeaveFunction("StopUserspace");}/*    "FindUserspace" returns the struct sock of the userspace-daemon, so that we can   "drop" our request in the accept-queue */static struct sock *FindUserspace(const unsigned short Port){	struct sock *sk;	EnterFunction("FindUserspace");	local_bh_disable();	sk = tcp_v4_lookup_listener(INADDR_ANY,Port,0);	local_bh_enable();	return sk;}static void dummy_destructor(struct open_request *req){}static struct or_calltable Dummy = {	0, 	NULL, 	NULL, 	&dummy_destructor, 	NULL};static int AddSocketToAcceptQueue(struct socket *sock,const int Port){	struct open_request *req;	struct sock *sk, *nsk;		EnterFunction("AddSocketToAcceptQueue");		sk = FindUserspace((unsigned short)Port);			if (sk==NULL)   /* No userspace-daemon found */	{		return -1;	}		lock_sock(sk);	if (sk->state != TCP_LISTEN || tcp_acceptq_is_full(sk))	{		release_sock(sk);		sock_put(sk);		return -1;	}	req = tcp_openreq_alloc();		if (req==NULL)	{			release_sock(sk);		sock_put(sk);		return -1;	}		nsk = sock->sk;	sock->sk = NULL;	sock->state = SS_UNCONNECTED;	req->class	= &Dummy;	write_lock_bh(&nsk->callback_lock);	nsk->socket = NULL;        nsk->sleep  = NULL;	write_unlock_bh(&nsk->callback_lock);	tcp_acceptq_queue(sk, req, nsk);		sk->data_ready(sk, 0);	release_sock(sk);	sock_put(sk);	LeaveFunction("AddSocketToAcceptQueue");			return +1;				}void InitUserspace(const int CPUNR){}