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/*
kHTTPd -- the next generation
RFC 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 40
static 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 BENCHMARK
static char HeaderPart1b[] ="HTTP/1.0 200 OK";
#endif
static 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;
}
#else
void 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 important
place 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");
}
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