/*kHTTPd -- the next generationRFC related functions (headers and stuff)*//**************************************************************** *	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/semaphore.h>#include <asm/processor.h>#include <asm/uaccess.h>#include "prototypes.h"#include "structure.h"#include "sysctl.h"#define KHTTPD_NUMMIMETYPES 	40static atomic_t	MimeCount;struct MimeType{	__u32 	identifier;	char	type[64-sizeof(__u32)-sizeof(__kernel_size_t)];  	__kernel_size_t	len;};static struct MimeType	MimeTypes[KHTTPD_NUMMIMETYPES];void AddMimeType(const char *Ident,const char *Type){		__u32	*I;		EnterFunction("AddMimeType");		if (strlen(Ident)!=4)    	{	   		(void)printk(KERN_ERR "httpd: Only 4-byte mime-identifiers are accepted\n");   		return;   	}	if (strlen(Type)>(64-sizeof(__u32)-sizeof(__kernel_size_t) ) )     	{	   		(void)printk(KERN_ERR "httpd: Mime-string too long.\n");   		return;   	}   	   	I=(__u32*)Ident;   	   	/* FIXME: Need to lock-down all access to the mime-structure here */   	/*        For now, just don't add mime-types after initialisation */   	   	   	MimeTypes[atomic_read(&MimeCount)].identifier=*I;   	strncpy(MimeTypes[atomic_read(&MimeCount)].type,Type,(64-sizeof(__u32)-sizeof(__kernel_size_t)));   	MimeTypes[atomic_read(&MimeCount)].len = strlen(Type);   	   	atomic_inc(&MimeCount);   	LeaveFunction("AddMimeType");}char *ResolveMimeType(const char *File,__kernel_size_t *Len)/*	The returned string is for READ ONLY, ownership of the memory is NOT	transferred.*/{		__u32	*I;	int pos,lc,filelen;		EnterFunction("ResolveMimeType");		*Len = 0;		if (File==NULL)		return NULL;		filelen = (int)strlen(File);		if (filelen<4)    	{	   		return NULL;   	}   	   	/* The Merced-people are NOT going to like this! So this has to be fixed   	   in a later stage. */	pos = filelen-4;   	I=(__u32*)(File+pos);   	   	lc=0;   	   	while (lc<atomic_read(&MimeCount)) 	{   		if (MimeTypes[lc].identifier == *I)   		{   			*Len = MimeTypes[lc].len;   			LeaveFunction("ResolveMimeType - success");   	  		return MimeTypes[lc].type;   	  	}   	  	lc++;   	} 	   		if (sysctl_khttpd_sloppymime)	{		*Len = MimeTypes[0].len;  		LeaveFunction("ResolveMimeType - unknown");	   	return MimeTypes[0].type;	}	else	{		LeaveFunction("ResolveMimeType - failure");	   	return NULL;	}}static char HeaderPart1[] = "HTTP/1.0 200 OK\r\nServer: kHTTPd/0.1.6\r\nDate: ";#ifdef BENCHMARKstatic char HeaderPart1b[] ="HTTP/1.0 200 OK";#endifstatic char HeaderPart3[] = "\r\nContent-type: ";static char HeaderPart5[] = "\r\nLast-modified: ";static char HeaderPart7[] = "\r\nContent-length: ";static char HeaderPart9[] = "\r\n\r\n";#ifdef BENCHMARK/* In BENCHMARK-mode, just send the bare essentials */void SendHTTPHeader(struct http_request *Request){	struct msghdr	msg;	mm_segment_t	oldfs;	struct iovec	iov[9];	int 		len,len2;			EnterFunction("SendHTTPHeader");			msg.msg_name     = 0;	msg.msg_namelen  = 0;	msg.msg_iov	 = &iov[0];	msg.msg_iovlen   = 6;	msg.msg_control  = NULL;	msg.msg_controllen = 0;	msg.msg_flags    = 0;  /* Synchronous for now */		iov[0].iov_base = HeaderPart1b;	iov[0].iov_len  = 15;	iov[1].iov_base = HeaderPart3;	iov[1].iov_len  = 16;	iov[2].iov_base = Request->MimeType;	iov[2].iov_len  = Request->MimeLength;		iov[3].iov_base = HeaderPart7;	iov[3].iov_len  = 18;			sprintf(Request->LengthS,"%i",Request->FileLength);	iov[4].iov_base = Request->LengthS;	iov[4].iov_len  = strlen(Request->LengthS);	iov[5].iov_base = HeaderPart9;	iov[5].iov_len  = 4;		len2=15+16+18+iov[2].iov_len+iov[4].iov_len+4;			len = 0;		oldfs = get_fs(); set_fs(KERNEL_DS);	len = sock_sendmsg(Request->sock,&msg,len2);	set_fs(oldfs);		return;	}#elsevoid SendHTTPHeader(struct http_request *Request){	struct msghdr	msg;	mm_segment_t	oldfs;	struct iovec	iov[9];	int 		len,len2;	__kernel_size_t	slen;		EnterFunction("SendHTTPHeader");		msg.msg_name     = 0;	msg.msg_namelen  = 0;	msg.msg_iov	 = &(iov[0]);	msg.msg_iovlen   = 9;	msg.msg_control  = NULL;	msg.msg_controllen = 0;	msg.msg_flags    = 0;  /* Synchronous for now */		iov[0].iov_base = HeaderPart1;	iov[0].iov_len  = 45;	iov[1].iov_base = CurrentTime;	iov[1].iov_len  = 29;	iov[2].iov_base = HeaderPart3;	iov[2].iov_len  = 16;		iov[3].iov_base = Request->MimeType;	iov[3].iov_len  = Request->MimeLength;		iov[4].iov_base = HeaderPart5;	iov[4].iov_len  = 17;	iov[5].iov_base = &(Request->TimeS[0]);	iov[5].iov_len  = 29;	iov[6].iov_base = HeaderPart7;	iov[6].iov_len  = 18;	iov[7].iov_base = &(Request->LengthS[0]);	slen = strlen(Request->LengthS); 	iov[7].iov_len  = slen;	iov[8].iov_base = HeaderPart9;	iov[8].iov_len  = 4;		len2=45+2*29+16+17+18+slen+4+iov[3].iov_len;		len = 0;	oldfs = get_fs(); set_fs(KERNEL_DS);	len = sock_sendmsg(Request->sock,&msg,len2);	set_fs(oldfs);	LeaveFunction("SendHTTPHeader");		return;	}#endif/* Parse a HTTP-header. Be careful for buffer-overflows here, this is the most importantplace for this, since the remote-user controls the data.*/void ParseHeader(char *Buffer,const int length, struct http_request *Head){	char *Endval,*EOL,*tmp;		EnterFunction("ParseHeader");	Endval = Buffer + length;		/* We want to parse only the first header if multiple headers are present */	tmp = strstr(Buffer,"\r\n\r\n"); 	if (tmp!=NULL)	    Endval = tmp;			while (Buffer<Endval)	{		if (isspace(Buffer[0]))		{			Buffer++;			continue;		}							EOL=strchr(Buffer,'\n');				if (EOL==NULL) EOL=Endval;				if (EOL-Buffer<4) 		{			Buffer++;			continue;		}				if (strncmp("GET ",Buffer,4)==0)		{			int PrefixLen;			Buffer+=4;						tmp=strchr(Buffer,' ');			if (tmp==0) 			{				tmp=EOL-1;				Head->HTTPVER = 9;			} else				Head->HTTPVER = 10;						if (tmp>Endval) continue;						strncpy(Head->FileName,sysctl_khttpd_docroot,sizeof(Head->FileName));			PrefixLen = strlen(sysctl_khttpd_docroot);			Head->FileNameLength = min_t(unsigned int, 255, tmp - Buffer + PrefixLen);								strncat(Head->FileName,Buffer,min_t(unsigned int, 255 - PrefixLen, tmp - Buffer));								Buffer=EOL+1;	#ifdef BENCHMARK			break;#endif									continue;		}#ifndef BENCHMARK				if (strncmp("If-Modified-Since: ",Buffer,19)==0)		{			Buffer+=19;						strncpy(Head->IMS,Buffer,min_t(unsigned int, 127,EOL-Buffer-1));								Buffer=EOL+1;				continue;		}		if (strncmp("User-Agent: ",Buffer,12)==0)		{			Buffer+=12;						strncpy(Head->Agent,Buffer,min_t(unsigned int, 127,EOL-Buffer-1));								Buffer=EOL+1;				continue;		}				if (strncmp("Host: ",Buffer,6)==0)		{			Buffer+=6;						strncpy(Head->Host,Buffer,min_t(unsigned int, 127,EOL-Buffer-1));								Buffer=EOL+1;				continue;		}#endif				Buffer = EOL+1;  /* Skip line */	}	LeaveFunction("ParseHeader");}