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contiki/apps/webserver/httpd.c

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/*
* Copyright (c) 2004, Adam Dunkels.
* 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: Adam Dunkels <adam@sics.se>
*
* $Id: httpd.c,v 1.12 2009/08/12 18:23:37 dak664 Exp $
*/
#include <stdio.h>
#include <string.h>
#include "contiki-net.h"
#include "webserver.h"
#include "httpd-fs.h"
#include "httpd-cgi.h"
#include "lib/petsciiconv.h"
#include "http-strings.h"
#include "httpd.h"
#ifndef WEBSERVER_CONF_CGI_CONNS
#define CONNS 4
#else /* WEBSERVER_CONF_CGI_CONNS */
#define CONNS WEBSERVER_CONF_CGI_CONNS
#endif /* WEBSERVER_CONF_CGI_CONNS */
#define STATE_WAITING 0
#define STATE_OUTPUT 1
#define SEND_STRING(s, str) PSOCK_SEND(s, (uint8_t *)str, (unsigned int)strlen(str))
MEMB(conns, struct httpd_state, CONNS);
#define ISO_nl 0x0a
#define ISO_space 0x20
#define ISO_bang 0x21
#define ISO_percent 0x25
#define ISO_period 0x2e
#define ISO_slash 0x2f
#define ISO_colon 0x3a
/*---------------------------------------------------------------------------*/
static unsigned short
generate(void *state)
{
struct httpd_state *s = (struct httpd_state *)state;
if(s->file.len > uip_mss()) {
s->len = uip_mss();
} else {
s->len = s->file.len;
}
memcpy(uip_appdata, s->file.data, s->len);
return s->len;
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(send_file(struct httpd_state *s))
{
PSOCK_BEGIN(&s->sout);
do {
PSOCK_GENERATOR_SEND(&s->sout, generate, s);
s->file.len -= s->len;
s->file.data += s->len;
} while(s->file.len > 0);
PSOCK_END(&s->sout);
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(send_part_of_file(struct httpd_state *s))
{
PSOCK_BEGIN(&s->sout);
PSOCK_SEND(&s->sout, (uint8_t *)s->file.data, s->len);
PSOCK_END(&s->sout);
}
/*---------------------------------------------------------------------------*/
static void
next_scriptstate(struct httpd_state *s)
{
char *p;
if((p = strchr(s->scriptptr, ISO_nl)) != NULL) {
p += 1;
s->scriptlen -= (unsigned short)(p - s->scriptptr);
s->scriptptr = p;
} else {
s->scriptlen = 0;
}
/* char *p;
p = strchr(s->scriptptr, ISO_nl) + 1;
s->scriptlen -= (unsigned short)(p - s->scriptptr);
s->scriptptr = p;*/
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(handle_script(struct httpd_state *s))
{
char *ptr;
PT_BEGIN(&s->scriptpt);
while(s->file.len > 0) {
/* Check if we should start executing a script. */
if(*s->file.data == ISO_percent &&
*(s->file.data + 1) == ISO_bang) {
s->scriptptr = s->file.data + 3;
s->scriptlen = s->file.len - 3;
if(*(s->scriptptr - 1) == ISO_colon) {
httpd_fs_open(s->scriptptr + 1, &s->file);
PT_WAIT_THREAD(&s->scriptpt, send_file(s));
} else {
PT_WAIT_THREAD(&s->scriptpt,
httpd_cgi(s->scriptptr)(s, s->scriptptr));
}
next_scriptstate(s);
/* The script is over, so we reset the pointers and continue
sending the rest of the file. */
s->file.data = s->scriptptr;
s->file.len = s->scriptlen;
} else {
/* See if we find the start of script marker in the block of HTML
to be sent. */
if(s->file.len > uip_mss()) {
s->len = uip_mss();
} else {
s->len = s->file.len;
}
if(*s->file.data == ISO_percent) {
ptr = strchr(s->file.data + 1, ISO_percent);
} else {
ptr = strchr(s->file.data, ISO_percent);
}
if(ptr != NULL &&
ptr != s->file.data) {
s->len = (int)(ptr - s->file.data);
if(s->len >= uip_mss()) {
s->len = uip_mss();
}
}
PT_WAIT_THREAD(&s->scriptpt, send_part_of_file(s));
s->file.data += s->len;
s->file.len -= s->len;
}
}
PT_END(&s->scriptpt);
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(send_headers(struct httpd_state *s, const char *statushdr))
{
char *ptr;
PSOCK_BEGIN(&s->sout);
SEND_STRING(&s->sout, statushdr);
ptr = strrchr(s->filename, ISO_period);
if(ptr == NULL) {
SEND_STRING(&s->sout, http_content_type_binary);
} else if(strncmp(http_html, ptr, 5) == 0 ||
strncmp(http_shtml, ptr, 6) == 0) {
SEND_STRING(&s->sout, http_content_type_html);
} else if(strncmp(http_css, ptr, 4) == 0) {
SEND_STRING(&s->sout, http_content_type_css);
} else if(strncmp(http_png, ptr, 4) == 0) {
SEND_STRING(&s->sout, http_content_type_png);
} else if(strncmp(http_gif, ptr, 4) == 0) {
SEND_STRING(&s->sout, http_content_type_gif);
} else if(strncmp(http_jpg, ptr, 4) == 0) {
SEND_STRING(&s->sout, http_content_type_jpg);
} else {
SEND_STRING(&s->sout, http_content_type_plain);
}
PSOCK_END(&s->sout);
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(handle_output(struct httpd_state *s))
{
char *ptr;
PT_BEGIN(&s->outputpt);
if(!httpd_fs_open(s->filename, &s->file)) {
httpd_fs_open(http_404_html, &s->file);
PT_WAIT_THREAD(&s->outputpt,
send_headers(s,
http_header_404));
PT_WAIT_THREAD(&s->outputpt,
send_file(s));
} else {
PT_WAIT_THREAD(&s->outputpt,
send_headers(s,
http_header_200));
ptr = strchr(s->filename, ISO_period);
if(ptr != NULL && strncmp(ptr, http_shtml, 6) == 0) {
PT_INIT(&s->scriptpt);
PT_WAIT_THREAD(&s->outputpt, handle_script(s));
} else {
PT_WAIT_THREAD(&s->outputpt,
send_file(s));
}
}
PSOCK_CLOSE(&s->sout);
PT_END(&s->outputpt);
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(handle_input(struct httpd_state *s))
{
PSOCK_BEGIN(&s->sin);
PSOCK_READTO(&s->sin, ISO_space);
if(strncmp(s->inputbuf, http_get, 4) != 0) {
PSOCK_CLOSE_EXIT(&s->sin);
}
PSOCK_READTO(&s->sin, ISO_space);
if(s->inputbuf[0] != ISO_slash) {
PSOCK_CLOSE_EXIT(&s->sin);
}
if(s->inputbuf[1] == ISO_space) {
strncpy(s->filename, http_index_html, sizeof(s->filename));
} else {
s->inputbuf[PSOCK_DATALEN(&s->sin) - 1] = 0;
strncpy(s->filename, &s->inputbuf[0], sizeof(s->filename));
}
webserver_log_file(&uip_conn->ripaddr, s->filename);
s->state = STATE_OUTPUT;
while(1) {
PSOCK_READTO(&s->sin, ISO_nl);
if(strncmp(s->inputbuf, http_referer, 8) == 0) {
s->inputbuf[PSOCK_DATALEN(&s->sin) - 2] = 0;
petsciiconv_topetscii(s->inputbuf, PSOCK_DATALEN(&s->sin) - 2);
webserver_log(s->inputbuf);
}
}
PSOCK_END(&s->sin);
}
/*---------------------------------------------------------------------------*/
static void
handle_connection(struct httpd_state *s)
{
handle_input(s);
if(s->state == STATE_OUTPUT) {
handle_output(s);
}
}
/*---------------------------------------------------------------------------*/
void
httpd_appcall(void *state)
{
struct httpd_state *s = (struct httpd_state *)state;
if(uip_closed() || uip_aborted() || uip_timedout()) {
if(s != NULL) {
memb_free(&conns, s);
}
} else if(uip_connected()) {
s = (struct httpd_state *)memb_alloc(&conns);
if(s == NULL) {
uip_abort();
return;
}
tcp_markconn(uip_conn, s);
PSOCK_INIT(&s->sin, (uint8_t *)s->inputbuf, sizeof(s->inputbuf) - 1);
PSOCK_INIT(&s->sout, (uint8_t *)s->inputbuf, sizeof(s->inputbuf) - 1);
PT_INIT(&s->outputpt);
s->state = STATE_WAITING;
/* timer_set(&s->timer, CLOCK_SECOND * 100);*/
s->timer = 0;
handle_connection(s);
} else if(s != NULL) {
if(uip_poll()) {
++s->timer;
if(s->timer >= 20) {
uip_abort();
memb_free(&conns, s);
}
} else {
s->timer = 0;
}
handle_connection(s);
} else {
uip_abort();
}
}
/*---------------------------------------------------------------------------*/
void
httpd_init(void)
{
tcp_listen(HTONS(80));
memb_init(&conns);
httpd_cgi_init();
}
#if UIP_CONF_IPV6
/*---------------------------------------------------------------------------*/
uint8_t
httpd_sprint_ip6(uip_ip6addr_t addr, char * result)
{
unsigned char i = 0;
unsigned char zerocnt = 0;
unsigned char numprinted = 0;
char * starting = result;
*result++='[';
while (numprinted < 8) {
if ((addr.u16[i] == 0) && (zerocnt == 0)) {
while(addr.u16[zerocnt + i] == 0) zerocnt++;
if (zerocnt == 1) {
*result++ = '0';
numprinted++;
break;
}
i += zerocnt;
numprinted += zerocnt;
} else {
result += sprintf(result, "%x", (unsigned int)(ntohs(addr.u16[i])));
i++;
numprinted++;
}
if (numprinted != 8) *result++ = ':';
}
*result++=']';
*result=0;
return (result - starting);
}
#endif /* UIP_CONF_IPV6 */
/*---------------------------------------------------------------------------*/
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