1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
#include "lwip/opt.h"
#include "lwip/arch.h"
#include "lwip/api.h"
const static char http_html_hdr[] = "HTTP/1.1 200 OK\r\nContent-type: text/html\r\n\r\n";
const static char http_index_html[] = "<html><head><title>Congrats!</title></head><body><h1>Welcome to our lwIP HTTP server!</h1><p>This is a small test page.</body></html>";
void http_server_serve(struct netconn *conn) {
struct netbuf *inbuf;
char *buf;
u16_t buflen;
/* Read the data from the port, blocking if nothing yet there.
We assume the request (the part we care about) is in one netbuf */
inbuf = netconn_recv(conn);
if (netconn_err(conn) == ERR_OK) {
netbuf_data(inbuf, &buf, &buflen);
/* Is this an HTTP GET command? (only check the first 5 chars, since
there are other formats for GET, and we're keeping it very simple )*/
if (buflen>=5 &&
buf[0]=='G' &&
buf[1]=='E' &&
buf[2]=='T' &&
buf[3]==' ' &&
buf[4]=='/' ) {
/* Send the HTML header
* subtract 1 from the size, since we dont send the \0 in the string
* NETCONN_NOCOPY: our data is const static, so no need to copy it
*/
netconn_write(conn, http_html_hdr, sizeof(http_html_hdr)-1, NETCONN_NOCOPY);
/* Send our HTML page */
netconn_write(conn, http_index_html, sizeof(http_index_html)-1, NETCONN_NOCOPY);
}
}
/* Close the connection (server closes in HTTP) */
netconn_close(conn);
/* Delete the buffer (netconn_recv gives us ownership,
so we have to make sure to deallocate the buffer) */
netbuf_delete(inbuf);
}
void http_server(void* parameter) {
struct netconn *conn, *newconn;
/* Create a new TCP connection handle */
conn = netconn_new(NETCONN_TCP);
LWIP_ERROR("http_server: invalid conn", (conn != NULL), );
/* Bind to port 80 (HTTP) with default IP address */
netconn_bind(conn, NULL, 80);
/* Put the connection into LISTEN state */
netconn_listen(conn);
while(1) {
newconn = netconn_accept(conn);
http_server_serve(newconn);
netconn_delete(newconn);
}
}
void httpd_init()
{
rt_thread_t httpd = rt_thread_create("web",
http_server, RT_NULL,
1024, 20, 8);
if (httpd != RT_NULL)
rt_thread_startup(httpd);
}
|
