339 lines
9.1 KiB
C
339 lines
9.1 KiB
C
/**
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* \addtogroup apps
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* @{
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*/
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/**
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* \defgroup httpd Web server
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* @{
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* The uIP web server is a very simplistic implementation of an HTTP
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* server. It can serve web pages and files from a read-only ROM
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* filesystem, and provides a very small scripting language.
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*/
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/**
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* \file
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* Web server
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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/*
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* Copyright (c) 2004, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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* $Id: httpd.c,v 1.2 2006/06/11 21:46:38 adam Exp $
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*/
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#include "uip.h"
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#include "httpd.h"
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#include "httpd-fs.h"
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#include "httpd-cgi.h"
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#include "http-strings.h"
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#include <string.h>
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#define STATE_WAITING 0
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#define STATE_OUTPUT 1
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#define ISO_nl 0x0a
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#define ISO_space 0x20
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#define ISO_bang 0x21
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#define ISO_percent 0x25
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#define ISO_period 0x2e
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#define ISO_slash 0x2f
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#define ISO_colon 0x3a
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/*---------------------------------------------------------------------------*/
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static unsigned short
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generate_part_of_file(void *state)
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{
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struct httpd_state *s = (struct httpd_state *)state;
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if(s->file.len > uip_mss()) {
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s->len = uip_mss();
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} else {
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s->len = s->file.len;
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}
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memcpy(uip_appdata, s->file.data, s->len);
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return s->len;
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}
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(send_file(struct httpd_state *s))
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{
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PSOCK_BEGIN(&s->sout);
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do {
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PSOCK_GENERATOR_SEND(&s->sout, generate_part_of_file, s);
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s->file.len -= s->len;
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s->file.data += s->len;
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} while(s->file.len > 0);
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PSOCK_END(&s->sout);
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}
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(send_part_of_file(struct httpd_state *s))
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{
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PSOCK_BEGIN(&s->sout);
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PSOCK_SEND(&s->sout, s->file.data, s->len);
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PSOCK_END(&s->sout);
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}
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/*---------------------------------------------------------------------------*/
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static void
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next_scriptstate(struct httpd_state *s)
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{
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char *p;
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p = strchr(s->scriptptr, ISO_nl) + 1;
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s->scriptlen -= (unsigned short)(p - s->scriptptr);
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s->scriptptr = p;
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}
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(handle_script(struct httpd_state *s))
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{
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char *ptr;
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PT_BEGIN(&s->scriptpt);
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while(s->file.len > 0) {
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/* Check if we should start executing a script. */
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if(*s->file.data == ISO_percent &&
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*(s->file.data + 1) == ISO_bang) {
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s->scriptptr = s->file.data + 3;
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s->scriptlen = s->file.len - 3;
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if(*(s->scriptptr - 1) == ISO_colon) {
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httpd_fs_open(s->scriptptr + 1, &s->file);
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PT_WAIT_THREAD(&s->scriptpt, send_file(s));
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} else {
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PT_WAIT_THREAD(&s->scriptpt,
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httpd_cgi(s->scriptptr)(s, s->scriptptr));
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}
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next_scriptstate(s);
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/* The script is over, so we reset the pointers and continue
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sending the rest of the file. */
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s->file.data = s->scriptptr;
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s->file.len = s->scriptlen;
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} else {
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/* See if we find the start of script marker in the block of HTML
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to be sent. */
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if(s->file.len > uip_mss()) {
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s->len = uip_mss();
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} else {
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s->len = s->file.len;
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}
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if(*s->file.data == ISO_percent) {
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ptr = strchr(s->file.data + 1, ISO_percent);
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} else {
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ptr = strchr(s->file.data, ISO_percent);
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}
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if(ptr != NULL &&
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ptr != s->file.data) {
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s->len = (int)(ptr - s->file.data);
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if(s->len >= uip_mss()) {
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s->len = uip_mss();
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}
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}
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PT_WAIT_THREAD(&s->scriptpt, send_part_of_file(s));
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s->file.data += s->len;
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s->file.len -= s->len;
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}
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}
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PT_END(&s->scriptpt);
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}
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(send_headers(struct httpd_state *s, const char *statushdr))
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{
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char *ptr;
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PSOCK_BEGIN(&s->sout);
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PSOCK_SEND_STR(&s->sout, statushdr);
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ptr = strrchr(s->filename, ISO_period);
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if(ptr == NULL) {
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PSOCK_SEND_STR(&s->sout, http_content_type_binary);
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} else if(strncmp(http_html, ptr, 5) == 0 ||
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strncmp(http_shtml, ptr, 6) == 0) {
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PSOCK_SEND_STR(&s->sout, http_content_type_html);
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} else if(strncmp(http_css, ptr, 4) == 0) {
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PSOCK_SEND_STR(&s->sout, http_content_type_css);
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} else if(strncmp(http_png, ptr, 4) == 0) {
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PSOCK_SEND_STR(&s->sout, http_content_type_png);
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} else if(strncmp(http_gif, ptr, 4) == 0) {
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PSOCK_SEND_STR(&s->sout, http_content_type_gif);
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} else if(strncmp(http_jpg, ptr, 4) == 0) {
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PSOCK_SEND_STR(&s->sout, http_content_type_jpg);
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} else {
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PSOCK_SEND_STR(&s->sout, http_content_type_plain);
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}
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PSOCK_END(&s->sout);
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}
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(handle_output(struct httpd_state *s))
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{
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char *ptr;
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PT_BEGIN(&s->outputpt);
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if(!httpd_fs_open(s->filename, &s->file)) {
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httpd_fs_open(http_404_html, &s->file);
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strcpy(s->filename, http_404_html);
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PT_WAIT_THREAD(&s->outputpt,
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send_headers(s,
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http_header_404));
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PT_WAIT_THREAD(&s->outputpt,
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send_file(s));
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} else {
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PT_WAIT_THREAD(&s->outputpt,
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send_headers(s,
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http_header_200));
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ptr = strchr(s->filename, ISO_period);
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if(ptr != NULL && strncmp(ptr, http_shtml, 6) == 0) {
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PT_INIT(&s->scriptpt);
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PT_WAIT_THREAD(&s->outputpt, handle_script(s));
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} else {
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PT_WAIT_THREAD(&s->outputpt,
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send_file(s));
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}
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}
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PSOCK_CLOSE(&s->sout);
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PT_END(&s->outputpt);
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}
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(handle_input(struct httpd_state *s))
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{
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PSOCK_BEGIN(&s->sin);
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PSOCK_READTO(&s->sin, ISO_space);
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if(strncmp(s->inputbuf, http_get, 4) != 0) {
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PSOCK_CLOSE_EXIT(&s->sin);
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}
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PSOCK_READTO(&s->sin, ISO_space);
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if(s->inputbuf[0] != ISO_slash) {
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PSOCK_CLOSE_EXIT(&s->sin);
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}
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if(s->inputbuf[1] == ISO_space) {
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strncpy(s->filename, http_index_html, sizeof(s->filename));
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} else {
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s->inputbuf[PSOCK_DATALEN(&s->sin) - 1] = 0;
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strncpy(s->filename, &s->inputbuf[0], sizeof(s->filename));
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}
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/* httpd_log_file(uip_conn->ripaddr, s->filename);*/
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s->state = STATE_OUTPUT;
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while(1) {
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PSOCK_READTO(&s->sin, ISO_nl);
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if(strncmp(s->inputbuf, http_referer, 8) == 0) {
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s->inputbuf[PSOCK_DATALEN(&s->sin) - 2] = 0;
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/* httpd_log(&s->inputbuf[9]);*/
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}
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}
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PSOCK_END(&s->sin);
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}
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/*---------------------------------------------------------------------------*/
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static void
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handle_connection(struct httpd_state *s)
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{
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handle_input(s);
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if(s->state == STATE_OUTPUT) {
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handle_output(s);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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httpd_appcall(void)
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{
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struct httpd_state *s = (struct httpd_state *)&(uip_conn->appstate);
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if(uip_closed() || uip_aborted() || uip_timedout()) {
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} else if(uip_connected()) {
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PSOCK_INIT(&s->sin, s->inputbuf, sizeof(s->inputbuf) - 1);
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PSOCK_INIT(&s->sout, s->inputbuf, sizeof(s->inputbuf) - 1);
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PT_INIT(&s->outputpt);
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s->state = STATE_WAITING;
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/* timer_set(&s->timer, CLOCK_SECOND * 100);*/
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s->timer = 0;
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handle_connection(s);
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} else if(s != NULL) {
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if(uip_poll()) {
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++s->timer;
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if(s->timer >= 20) {
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uip_abort();
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}
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} else {
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s->timer = 0;
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}
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handle_connection(s);
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} else {
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uip_abort();
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Initialize the web server
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*
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* This function initializes the web server and should be
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* called at system boot-up.
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*/
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void
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httpd_init(void)
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{
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uip_listen(HTONS(80));
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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