httpd.c
来自「最新版IAR FOR ARM（EWARM）5.11中的代码例子」· C语言 代码 · 共 282 行
C
282 行
//*****************************************************************************
// HTTP server.
// Adam Dunkels <adam@dunkels.com>
//
// Copyright (c) 2001, 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. The name of the author may not be used to endorse or promote
// products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 uIP TCP/IP stack.
//
//*****************************************************************************
#include "uip.h"
#include "httpd.h"
//*****************************************************************************
//
// Macro for easy access to buffer data
//
//*****************************************************************************
#define BUF_APPDATA ((u8_t *)uip_appdata)
//*****************************************************************************
//
// Definitions of HTTP Server States
//
//*****************************************************************************
#define HTTP_NOGET 0
#define HTTP_FILE 1
#define HTTP_TEXT 2
#define HTTP_FUNC 3
#define HTTP_END 4
//*****************************************************************************
//
// Global for keeping up with web server state.
//
//*****************************************************************************
struct httpd_state *hs;
//*****************************************************************************
//
// Default Web Page - allocated in three segments to allow easy update of a
// counter that is incremented each time the page is sent.
//
//*****************************************************************************
static const char default_page_buf1of3[] =
"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd\">"
"<html>"
"<head>"
"<title>Welcome to the uIP web server!</title>"
"</head>"
"<body>"
"This web page is served by a small web server running on top of "
"the <a href=\"http://www.sics.se/~adam/uip/\">uIP embedded TCP/IP "
"stack</a>."
"<hr>"
"The uIP stack is running on the "
"<a href=\"http://www.luminarymicro.com\">Luminary Micro, Inc</a> "
"Stellaris® Ethernet Evaluation Kit"
"<hr>"
"This page has been sent ";
static char default_page_buf2of3[] =
"00001";
static const char default_page_buf3of3[] =
" times since reset!"
"</body>"
"</html>";
//*****************************************************************************
//
// Increment the view count. This routine will increment the 5-digit ascii
// counter that is sent with the web page.
//
//*****************************************************************************
static void
httpd_inc_page_count(void)
{
//
// Increment the 'ones' digit. If it wraps, then increment the 'tens'
// digit.
//
default_page_buf2of3[4]++;
if(default_page_buf2of3[4] == 0x3a)
{
default_page_buf2of3[4] = 0x30;
default_page_buf2of3[3]++;
}
//
// If the 'tens' digit wraps, increment the 'hundreds' digit.
//
if(default_page_buf2of3[3] == 0x3a)
{
default_page_buf2of3[3] = 0x30;
default_page_buf2of3[2]++;
}
//
// If the 'hundreds' digit wraps, increment the 'thousands' digit.
//
if(default_page_buf2of3[2] == 0x3a)
{
default_page_buf2of3[2] = 0x30;
default_page_buf2of3[1]++;
}
//
// If the 'thousands' digit wraps, increment the 'ten-thousands' digit.
//
if(default_page_buf2of3[1] == 0x3a)
{
default_page_buf2of3[1] = 0x30;
default_page_buf2of3[0]++;
}
//
// If the 'ten-thousands' digit wrapped, start over.
//
if(default_page_buf2of3[0] == 0x3a)
{
default_page_buf2of3[0] = 0x30;
}
}
//*****************************************************************************
//
// Initialize the web server.
//
// Starts to listen for incoming connection requests on TCP port 80.
//
//*****************************************************************************
void
httpd_init(void)
{
//
// Listen to port 80.
//
uip_listen(HTONS(80));
}
//*****************************************************************************
//
// HTTP Application Callback Function
//
//*****************************************************************************
void
httpd_appcall(void)
{
switch(uip_conn->lport)
{
//
// This is the web server:
//
case HTONS(80):
{
//
// Pick out the application state from the uip_conn structure.
//
hs = (struct httpd_state *)&(uip_conn->appstate);
//
// We use the uip_ test functions to deduce why we were
// called. If uip_connected() is non-zero, we were called
// because a remote host has connected to us. If
// uip_newdata() is non-zero, we were called because the
// remote host has sent us new data, and if uip_acked() is
// non-zero, the remote host has acknowledged the data we
// previously sent to it. */
if(uip_connected())
{
//
// Since we have just been connected with the remote host, we
// reset the state for this connection. The ->count variable
// contains the amount of data that is yet to be sent to the
// remote host, and the ->state is set to HTTP_NOGET to signal
// that we haven't received any HTTP GET request for this
// connection yet.
//
hs->state = HTTP_NOGET;
hs->count = 0;
return;
}
else if(uip_poll())
{
//
// If we are polled ten times, we abort the connection. This is
// because we don't want connections lingering indefinately in
// the system.
//
if(hs->count++ >= 10)
{
uip_abort();
}
return;
}
else if(uip_newdata() && hs->state == HTTP_NOGET)
{
//
// This is the first data we receive, and it should contain a
// GET.
//
// Check for GET.
//
if(BUF_APPDATA[0] != 'G' ||
BUF_APPDATA[1] != 'E' ||
BUF_APPDATA[2] != 'T' ||
BUF_APPDATA[3] != ' ')
{
//
// If it isn't a GET, we abort the connection.
//
uip_abort();
return;
}
//
// Send buffer 1
//
uip_send(default_page_buf1of3,
sizeof(default_page_buf1of3) - 1);
}
else if(uip_acked())
{
hs->count++;
if(hs->count == 1)
{
uip_send(default_page_buf2of3,
sizeof(default_page_buf2of3) - 1);
}
else if(hs->count == 2)
{
uip_send(default_page_buf3of3,
sizeof(default_page_buf3of3) - 1);
}
else
{
httpd_inc_page_count();
uip_close();
}
}
//
// Finally, return to uIP. Our outgoing packet will soon be on its
// way...
//
return;
}
default:
{
//
// Should never happen.
//
uip_abort();
break;
}
}
}
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