contiki/apps/webserver/urlconv.c

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/*
* Copyright (c) 2010, Kajtar Zsolt <soci@c64.rulez.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* Author: Kajtar Zsolt <soci@c64.rulez.org>
*
*/
#include <string.h>
#include "cfs/cfs.h"
#include "http-strings.h"
#define ISO_number 0x23
#define ISO_percent 0x25
#define ISO_period 0x2e
#define ISO_slash 0x2f
#define ISO_question 0x3f
static char wwwroot[40];
static unsigned char wwwrootlen;
void
urlconv_init(void)
{
int fd = cfs_open("wwwroot.cfg", CFS_READ);
int rd = cfs_read(fd, wwwroot, sizeof(wwwroot));
cfs_close(fd);
if(rd != -1) wwwrootlen = rd;
}
/*---------------------------------------------------------------------------*/
/* URL to filename conversion
*
* prepends wwwroot prefix
* normalizes path by removing "/./"
* interprets "/../" and calculates path accordingly
* resulting path is always absolute
* replaces "%AB" notation with characters
* strips "#fragment" and "?query" from end
* replaces multiple slashes with a single one
* rejects non-ASCII characters
*
* MAXLEN is including trailing zero!
* input and output is ASCII
*/
void
urlconv_tofilename(char *dest, char *source, unsigned char maxlen)
{
static unsigned char len;
static unsigned char c, hex1;
static unsigned char *from, *to;
*dest = ISO_slash;
strncpy(dest + 1, wwwroot, wwwrootlen);
len = 0;
from = source; to = dest + wwwrootlen;
maxlen -= 2 + wwwrootlen;
do {
c = *(from++);
switch(c) {
case ISO_number:
case ISO_question:
c = 0;
break;
case ISO_percent:
c = 0;
hex1 = (*(from++) | 0x20) ^ 0x30; // ascii only!
if(hex1 > 0x50 && hex1 < 0x57)
hex1 -= 0x47;
else
if(hex1 > 9)
break; // invalid hex
c = (*(from++) | 0x20) ^ 0x30; // ascii only!
if(c > 0x50 && c < 0x57)
c -= 0x47;
else
if(c > 9)
break; // invalid hex
c |= hex1 << 4;
}
if(c < 0x20 || c > 0x7e)
c = 0; // non ascii?!
if(len >= maxlen)
c = 0; // too long?
if(c == ISO_slash || !c) {
switch(*to) {
case ISO_slash:
continue; // no repeated slash
case ISO_period:
switch(to[-1]) {
case ISO_slash: // handle "./"
--to; --len;
continue;
case ISO_period:
if(to[-2] == ISO_slash) {
to -= 2; len -= 2;
if(len) {
do {
--to; --len;
} while(*to != ISO_slash);
}
continue;
}
}
}
}
if(c) {
++to; ++len;
*to = c;
}
} while(c);
if(*to == ISO_slash && (len + sizeof(http_index_htm) - 3) < maxlen) {
strcpy(to, http_index_htm); // add index.htm
} else {
++to;
*to = 0;
}
}
/*---------------------------------------------------------------------------*/