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冯佳
2026-02-09 10:27:21 +08:00
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12
lwip/lwip-2.2.1/contrib/apps/httpserver/README Normal file
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HTTPSERVER
This is a demonstration of how to make the most basic kind
of server using lWIP.
* httpserver-raw.c - uses raw TCP calls (coming soon!)
* httpserver-netconn.c - uses netconn and netbuf API
This code updates the examples in Adam Dunkel's original
lwIP documentation to match changes in the code since that
PDF release.

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lwip/lwip-2.2.1/contrib/apps/httpserver/httpserver-netconn.c Normal file
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#include "lwip/opt.h"
#include "lwip/arch.h"
#include "lwip/api.h"
#include "httpserver-netconn.h"
#if LWIP_NETCONN
#ifndef HTTPD_DEBUG
#define HTTPD_DEBUG LWIP_DBG_OFF
#endif
static const char http_html_hdr[] = "HTTP/1.1 200 OK\r\nContent-type: text/html\r\n\r\n";
static const 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, served by httpserver-netconn.</body></html>";
/** Serve one HTTP connection accepted in the http thread */
static void
http_server_netconn_serve(struct netconn *conn)
{
struct netbuf *inbuf;
char *buf;
u16_t buflen;
err_t err;
/* Read the data from the port, blocking if nothing yet there.
We assume the request (the part we care about) is in one netbuf */
err = netconn_recv(conn, &inbuf);
if (err == ERR_OK) {
netbuf_data(inbuf, (void**)&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 don't 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);
}
/** The main function, never returns! */
static void
http_server_netconn_thread(void *arg)
{
struct netconn *conn, *newconn;
err_t err;
LWIP_UNUSED_ARG(arg);
/* Create a new TCP connection handle */
/* Bind to port 80 (HTTP) with default IP address */
#if LWIP_IPV6
conn = netconn_new(NETCONN_TCP_IPV6);
netconn_bind(conn, IP6_ADDR_ANY, 80);
#else /* LWIP_IPV6 */
conn = netconn_new(NETCONN_TCP);
netconn_bind(conn, IP_ADDR_ANY, 80);
#endif /* LWIP_IPV6 */
LWIP_ERROR("http_server: invalid conn", (conn != NULL), return;);
/* Put the connection into LISTEN state */
netconn_listen(conn);
do {
err = netconn_accept(conn, &newconn);
if (err == ERR_OK) {
http_server_netconn_serve(newconn);
netconn_delete(newconn);
}
} while(err == ERR_OK);
LWIP_DEBUGF(HTTPD_DEBUG,
("http_server_netconn_thread: netconn_accept received error %d, shutting down\n",
err));
netconn_close(conn);
netconn_delete(conn);
}
/** Initialize the HTTP server (start its thread) */
void
http_server_netconn_init(void)
{
sys_thread_new("http_server_netconn", http_server_netconn_thread, NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
}
#endif /* LWIP_NETCONN*/

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lwip/lwip-2.2.1/contrib/apps/httpserver/httpserver-netconn.h Normal file
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#ifndef LWIP_HTTPSERVER_NETCONN_H
#define LWIP_HTTPSERVER_NETCONN_H
void http_server_netconn_init(void);
#endif /* LWIP_HTTPSERVER_NETCONN_H */