/*kHTTPd -- the next generationGeneral functions*//**************************************************************** *	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. * ****************************************************************/#include <linux/kernel.h>#include <linux/ctype.h>#include <linux/errno.h>#include <linux/slab.h>#include <linux/net.h>#include <linux/sched.h>#include <linux/skbuff.h>#include <linux/unistd.h>#include <linux/file.h>#include <linux/smp_lock.h>#include <net/ip.h>#include <net/sock.h>#include <asm/atomic.h>#include <asm/errno.h>#include <asm/semaphore.h>#include <asm/processor.h>#include <asm/uaccess.h>#include "structure.h"#include "prototypes.h"#ifndef ECONNRESET#define ECONNRESET 102#endif/*Readrest reads and discards all pending input on a socket. This is requiredbefore closing the socket.*/static void ReadRest(struct socket *sock){	struct msghdr		msg;	struct iovec		iov;	int			len;	mm_segment_t		oldfs;			EnterFunction("ReadRest");			if (sock->sk==NULL)		return;	len = 1;			while (len>0)	{		static char		Buffer[1024];   /* Never read, so doesn't need to							   be SMP safe */		msg.msg_name     = 0;		msg.msg_namelen  = 0;		msg.msg_iov	 = &iov;		msg.msg_iovlen   = 1;		msg.msg_control  = NULL;		msg.msg_controllen = 0;		msg.msg_flags    = MSG_DONTWAIT;			msg.msg_iov->iov_base = &Buffer[0];		msg.msg_iov->iov_len  = (__kernel_size_t)1024;			len = 0;		oldfs = get_fs(); set_fs(KERNEL_DS);		len = sock_recvmsg(sock,&msg,1024,MSG_DONTWAIT);		set_fs(oldfs);	}	LeaveFunction("ReadRest");}/*CleanUpRequest takes care of shutting down the connection, closing the file-pointerand releasing the memory of the request-structure. Do not try to access it afterwards!*/void CleanUpRequest(struct http_request *Req){	EnterFunction("CleanUpRequest");			/* Close the socket ....*/	if ((Req->sock!=NULL)&&(Req->sock->sk!=NULL))	{		ReadRest(Req->sock);		remove_wait_queue(Req->sock->sk->sleep,&(Req->sleep));	    	sock_release(Req->sock);	}		/* ... and the file-pointer ... */	if (Req->filp!=NULL)	{	    	fput(Req->filp);	    	Req->filp = NULL;	}			/* ... and release the memory for the structure. */	kfree(Req);		atomic_dec(&ConnectCount);	LeaveFunction("CleanUpRequest");}/*SendBuffer and Sendbuffer_async send "Length" bytes from "Buffer" to the "sock"et.The _async-version is non-blocking.A positive return-value indicates the number of bytes sent, a negative value indicatesan error-condition.*/int SendBuffer(struct socket *sock, const char *Buffer,const size_t Length){	struct msghdr	msg;	mm_segment_t	oldfs;	struct iovec	iov;	int 		len;		EnterFunction("SendBuffer");		msg.msg_name     = 0;	msg.msg_namelen  = 0;	msg.msg_iov	 = &iov;	msg.msg_iovlen   = 1;	msg.msg_control  = NULL;	msg.msg_controllen = 0;	msg.msg_flags    = MSG_NOSIGNAL;    	msg.msg_iov->iov_len = (__kernel_size_t)Length;	msg.msg_iov->iov_base = (char*) Buffer;			len = 0;		oldfs = get_fs(); set_fs(KERNEL_DS);	len = sock_sendmsg(sock,&msg,(size_t)(Length-len));	set_fs(oldfs);	LeaveFunction("SendBuffer");	return len;	}int SendBuffer_async(struct socket *sock, const char *Buffer,const size_t Length){	struct msghdr	msg;	mm_segment_t	oldfs;	struct iovec	iov;	int 		len;		EnterFunction("SendBuffer_async");	msg.msg_name     = 0;	msg.msg_namelen  = 0;	msg.msg_iov	 = &iov;	msg.msg_iovlen   = 1;	msg.msg_control  = NULL;	msg.msg_controllen = 0;	msg.msg_flags    = MSG_DONTWAIT|MSG_NOSIGNAL;    	msg.msg_iov->iov_base = (char*) Buffer;	msg.msg_iov->iov_len  = (__kernel_size_t)Length;		if (sock->sk)	{			oldfs = get_fs(); set_fs(KERNEL_DS);		len = sock_sendmsg(sock,&msg,(size_t)(Length));		set_fs(oldfs);	} else	{		return -ECONNRESET;	}		LeaveFunction("SendBuffer_async");	return len;	}/* HTTP header shortcuts. Hardcoded since these might be called in a low-memorysituation, and they don't change anyhow.*/static char NoPerm[] = "HTTP/1.0 403 Forbidden\r\nServer: kHTTPd 0.1.6\r\n\r\n";static char TryLater[] = "HTTP/1.0 503 Service Unavailable\r\nServer: kHTTPd 0.1.6\r\nContent-Length: 15\r\n\r\nTry again later";static char NotModified[] = "HTTP/1.0 304 Not Modified\r\nServer: kHTTPd 0.1.6\r\n\r\n";void Send403(struct socket *sock){	EnterFunction("Send403");	(void)SendBuffer(sock,NoPerm,strlen(NoPerm));	LeaveFunction("Send403");}void Send304(struct socket *sock){	EnterFunction("Send304");	(void)SendBuffer(sock,NotModified,strlen(NotModified));	LeaveFunction("Send304");}void Send50x(struct socket *sock){	EnterFunction("Send50x");	(void)SendBuffer(sock,TryLater,strlen(TryLater));	LeaveFunction("Send50x");}