📄 http.c
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/*********************************************************************************
* http.c v1.00 webserver程序 *
* 版权(c) 2004- 北京百科融创科技有限公司 *
* 设计者： 赵治心 *
* 邮箱： ourui.wl@263.net *
**********************************************************************************/
#include "stdio.h"
#include "tcp_ip.h"
#include "8019head.h"
#include "global.h"
char html_header[] = {
"HTTP/1.1 200 OK\n"
"Cache-control: no-cache\n"
"Connection: Keep-Alive\n"
"Content-Length: 186\n"
"Content-Type: text/html\r\n\r\n" };
// This page displays a table with weather data and a switch
// to turn a port pin on and off.
char web_page[] = {
"<html>\n"
"<head>\n"
"<title>Title of page</title>\n"
"</head>\n"
"<body>\n"
"<marquee height=40 width=100% bgcolor=aaeeaa>\n"
"<h1>北京百科融创科技有限公司欢迎您选用本公司产品!</h1>\n"
"</marquee>\n"
"</body>\n"
"</html>\n"
};
UINT strlen(char *string)
{
char *rstr = string;
UINT n = 0;
while (*rstr++) ++n;
return (n);
}
char * strstr(char *haystack, char *needle)
{
char *ptr1, *ptr2;
// Protect against NULL pointer
if (*needle == 0) return(haystack);
for( ; *haystack; haystack++ )
{
for(ptr1 = needle, ptr2 = haystack; *ptr1 && (*ptr1 == *ptr2); ++ptr1, ++ptr2);
// If there is a match then return pointer to needle in haystack
if(*ptr1 == 0) return(haystack);
}
return NULL; // no matching string found
}
void http_send(UCHAR * outbuf, UINT len, UCHAR nr)
{
TCP_HEADER * tcp;
IP_HEADER * ip;
ULONG sum;
UINT result;
int i;
// Fill in TCP segment header
tcp = (TCP_HEADER *)(outbuf + 34);
ip = (IP_HEADER *)(outbuf + 14);
tcp->source_port[0] = (HTTP_PORT&0xff00)>>8;
tcp->source_port[1] = HTTP_PORT&0x00ff;
tcp->dest_port[0] = conxn[nr].port[0];
tcp->dest_port[1] = conxn[nr].port[1];
for(i=0;i<4;i++)
{
tcp->sequence[i] = conxn[nr].my_sequence[i];
tcp->ack_number[i] = conxn[nr].his_sequence[i];
}
// Header is always 20 bytes long
i = 0x5000 | FLG_ACK | FLG_PSH;
tcp->flags[0] = (i&0xff00)>>8;
tcp->flags[1] = i&0x00ff;
tcp->window[0] = 4;
tcp->window[1] = 0;
tcp->checksum[0] = 0;
tcp->checksum[1] = 0;
tcp->urgent_ptr[0] = 0;
tcp->urgent_ptr[1] = 0;
// Compute checksum including 12 bytes of pseudoheader
// Must pre-fill 2 items in ip header to do this
for(i=0;i<4;i++)
{
ip->dest_ipaddr[i] = conxn[nr].ipaddr[i];
ip->source_ipaddr[i] = sed_lclIPAddr[i];
}
// Sum source_ipaddr, dest_ipaddr, and entire TCP message
sum = (ULONG)cksum(outbuf + 26, 8 + len);
// Add in the rest of pseudoheader which is
// protocol id and TCP segment length
sum += (ULONG)0x0006;
sum += (ULONG)len;
// In case there was a carry, add it back around
result = (UINT)(sum + (sum >> 16));
result = ~result;
tcp->checksum[0] = (result&0xff00)>>8;
tcp->checksum[1] = result&0x00ff;
//if (debug) printf("TCP: Sending msg to IP layer\n");
ip_send(outbuf, conxn[nr].ipaddr, TCP_TYPE, len);
// (Re)start TCP retransmit timer
conxn[nr].timer = TCP_TIMEOUT;
}
UINT http_server(UCHAR * inbuf, UINT header_len, UCHAR nr, UCHAR resend)
{
ULONG sum;
int i,temp;
UINT body_len, hhdr_len, jhdr_len, page_len, jpeg_len;
UINT sent, remaining;
UCHAR * outbuf;
UCHAR * ptr;
UCHAR * tcp_data;
UCHAR request;
static UCHAR post_flg = FALSE;
// Make sure this is a valid connection
if (nr == NO_CONNECTION) return 0;
// Compute start of TCP data
if (!resend)
{
tcp_data = inbuf + 34 + header_len;
for(i=0;i<20;i++)
conxn[nr].query[i] = *(tcp_data+1);
for(i=0;i<4;i++)
conxn[nr].old_sequence[i] = conxn[nr].my_sequence[i];
}
// If this is a resend, set sequence number to what it was
// the last time we sent this
else
{
tcp_data = inbuf;
for(i=0;i<4;i++)
conxn[nr].my_sequence[i] = conxn[nr].old_sequence[i];
}
// Start off with no request
request = NONE;
// See if this is a GET message
if (strstr((char *)tcp_data, (char *)"GET") != NULL)
{
post_flg = FALSE;
if (strstr((char *)tcp_data, (char *)"/ ") != NULL) request = GET_PAGE;
else if (strstr((char *)tcp_data, (char *)"index") != NULL) request = GET_PAGE;
}
if (request == GET_PAGE)
{
// Figure out sizes
hhdr_len = strlen(html_header);
page_len = strlen(web_page);
body_len = hhdr_len + page_len;
outbuf = (UCHAR *)SendBuffer;
for(i=0;i<hhdr_len;i++)
*(outbuf+i+54) = html_header[i];
for(i=0;i<page_len;i++)
*(outbuf+i+hhdr_len+54) = web_page[i];
*(outbuf + body_len+54) = 0; // Append NULL
// Segment length = body_len + 20
http_send(outbuf, body_len + 20, nr);
temp = (conxn[nr].my_sequence[2]<<8)+conxn[nr].my_sequence[3];
sum = (conxn[nr].my_sequence[0]<<8)+conxn[nr].my_sequence[1];
sum = (sum<<16)+(LONG)temp+body_len;
temp = (UINT)(sum>>16);
conxn[nr].my_sequence[0] = (temp&0xff00)>>8;
conxn[nr].my_sequence[1] = temp&0x00ff;
temp = (UINT)sum;
conxn[nr].my_sequence[2] = (temp&0xff00)>>8;
conxn[nr].my_sequence[3] = temp&0x00ff;
}
else
return 0;
return(body_len);
}
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