Httpd server.

#include <string.h>
#include "lwip/debug.h"
#include "lwip/stats.h"
#include "lwip/tcp.h"
#include "lwipopts.h"
#include "httpd.h"
#include "fs.h"
#include <port.h>

Data Structures
struct	http_state
	state info for file sending by http More...

Functions
static int	cgi_GetStaus (const char name, char recv_buf, size_t recv_len)
	Send a JSON string representing the board status. More...

static http_handler_t	cgi_search (const char name, HttpCGI table)
	CGI request search engine. More...

static int	cgi_SetLed (const char name, char recv_buf, size_t recv_len)
	Set the led status and send back the new status. More...

static const char *	get_ext (const char *name)
	Get filename extension type. More...

static err_t	http_accept (void arg, struct tcp_pcb pcb, err_t err)
	Accept incoming HTTP connection requests. More...

static void	http_close_conn (struct tcp_pcb pcb, struct http_state hs)
	Close HTTP connection. More...

static void	http_conn_err (void *arg, err_t err)
	Callback called on connection error. More...

static void	http_decodeUrl (const char raw_buf, size_t raw_len, char decodec_buf, size_t len)
	Decode URL. More...

static void	http_getPageName (const char recv_buf, size_t recv_len, char page_name, size_t len)
	Get requested page name. More...

static int	http_getValue (char tolenized_buf, size_t tolenized_buf_len, const char key, char *value, size_t len)
	Get key value from tokenized buffer. More...

static char	http_hexToAscii (char first, char second)
	ASCII to HEX converter. More...

static err_t	http_poll (void arg, struct tcp_pcb pcb)
	Poll for HTTP data. More...

static err_t	http_recv (void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
	Core HTTP server receive function. More...

static int	http_searchContentType (const char *name)
	Match content type based on filename extension. More...

static void	http_send_data (struct tcp_pcb pcb, struct http_state hs)
	Send HTTP data. More...

static void	http_sendInternalErr (int content_type)
	Send HTTP internal server error code. More...

static void	http_sendOk (int content_type)
	Send the HTTP header with the appropriated content type. More...

static err_t	http_sent (void arg, struct tcp_pcb pcb, u16_t len)
	Callback to handle data transfered. More...

static int	http_tokenizeGetRequest (char *raw_buf, size_t raw_len)
	Tokenize a buffer. More...

static void	http_write (const char *buf, u32_t len)
	Write HTTP data. More...

void	httpd_init (void)
	HTTP server init. More...

Variables
HttpCGI	cgi_table []
	CGI table where we associate one callback to one page. More...

static char	decoded_str [80]
	Decoded message buffer. More...

struct http_state *	g_hs

struct tcp_pcb *	g_pcb
	the TCP protocol control block More...

struct {
const char * content

const char * key

}	http_content_type []
	http content type indicated with keys More...

static const char	http_html_hdr_200 [] = "HTTP/1.0 200 OK\r\n"
	http html header More...

static const char	http_html_hdr_404 [] = "HTTP/1.0 404 Not Found\r\n"

static const char	http_html_hdr_500 [] = "HTTP/1.0 500 Internal Server Error\r\n"

const char	http_server_error []
	http error page html More...

static char	key_value [80]
	HTTP buffer to store key value. More...

static char	req_string [80]
	Handle the incoming client request. More...

u8_t	tx_buf [CONFIG_AFSK_TX_BUFLEN]

static int cgi_GetStaus	(	const char *	name,
		char *	recv_buf,
		size_t	recv_len
	)

static

Send a JSON string representing the board status.

Parameters

name	String containing the status request.
recv_buf	Receive buffer.
recv_len	Receive buffer length.

Returns: -1 failed,0:success.

References HTTP_CONTENT_JSON, http_sendOk(), http_write(), LED_0_PIN, port_pin_get_output_level(), tx_buf, and UNUSED.

static http_handler_t cgi_search	(	const char *	name,
		HttpCGI *	table
	)

static

CGI request search engine.

Parameters

name	CGI request name.
table	CGI handler table.

Returns: A valid function handler for the specified CGI request, NULL otherwise.

References CGI_MATCH_EXT, CGI_MATCH_NAME, get_ext(), HttpCGI::handler, and NULL.

Referenced by http_recv().

static int cgi_SetLed	(	const char *	name,
		char *	recv_buf,
		size_t	recv_len
	)

static

Set the led status and send back the new status.

Parameters

name	String containing the status request.
recv_buf	Receive buffer.
recv_len	Receive buffer length.

Returns: -1 failed,0:success.

References CGI_LED_CMD_KEY, CGI_LED_ID_KEY, HTTP_CONTENT_JSON, http_getValue(), http_sendInternalErr(), http_sendOk(), http_tokenizeGetRequest(), http_write(), key_value, LED_0_PIN, port_pin_set_output_level(), tx_buf, and UNUSED.

static const char* get_ext ( const char * name )

static

Get filename extension type.

Parameters

name	String containing a filename.

Returns: Extension type on success, NULL otherwise.

References NULL.

Referenced by cgi_search(), and http_searchContentType().

static err_t http_accept	(	void *	arg,
		struct tcp_pcb *	pcb,
		err_t	err
	)

static

Accept incoming HTTP connection requests.

Parameters

arg	Pointer to structure representing the HTTP state.
pcb	Pointer to a TCP connection structure.
err	Connection status.

Returns: ERR_OK on success.

References ERR_MEM, ERR_OK, http_state::file, http_conn_err(), http_poll(), http_recv(), http_state::left, LWIP_UNUSED_ARG, mem_malloc(), NULL, http_state::retries, tcp_arg(), tcp_err(), tcp_poll(), TCP_PRIO_MIN, tcp_recv(), and tcp_setprio().

Referenced by httpd_init().

static void http_close_conn	(	struct tcp_pcb *	pcb,
		struct http_state *	hs
	)

static

Close HTTP connection.

Parameters

pcb	Pointer to a TCP connection structure.
hs	Pointer to structure representing the HTTP state.

References mem_free(), NULL, tcp_arg(), tcp_close(), tcp_recv(), and tcp_sent().

Referenced by http_recv(), and http_sent().

static void http_conn_err	(	void *	arg,
		err_t	err
	)

static

Callback called on connection error.

Parameters

arg	Pointer to structure representing the HTTP state.
err	Error code.

References arg, LWIP_UNUSED_ARG, and mem_free().

Referenced by http_accept().

static void http_decodeUrl	(	const char *	raw_buf,
		size_t	raw_len,
		char *	decodec_buf,
		size_t	len
	)

static

Decode URL.

Parameters

raw_buf	Input buffer.
raw_len	Input buffer length.
decodec_buf	Output decoded buffer.
len	Output buffer length.

References http_hexToAscii().

Referenced by http_getValue().

static void http_getPageName	(	const char *	recv_buf,
		size_t	recv_len,
		char *	page_name,
		size_t	len
	)

static

Get requested page name.

Parameters

recv_buf	Receive buffer.
recv_len	Receive buffer length.
page_name	Output buffer to store requestd page name.
len	Output buffer length.

Referenced by http_recv().

static int http_getValue	(	char *	tolenized_buf,
		size_t	tolenized_buf_len,
		const char *	key,
		char *	value,
		size_t	len
	)

static

Get key value from tokenized buffer.

Parameters

tolenized_buf	.
tolenized_buf_len	.
key	.
value
len	.

References decoded_str, and http_decodeUrl().

Referenced by cgi_SetLed().

static char http_hexToAscii	(	char	first,
		char	second
	)

static

ASCII to HEX converter.

Parameters

first	First digit.
second	Second digit.

Returns: String result.

Referenced by http_decodeUrl().

static err_t http_poll	(	void *	arg,
		struct tcp_pcb *	pcb
	)

static

Poll for HTTP data.

Parameters

arg	Pointer to structure representing the HTTP state.
pcb	Pointer to a TCP connection structure.

Returns: ERR_OK on success, ERR_ABRT otherwise.

References arg, ERR_ABRT, ERR_OK, http_state::file, http_send_data(), NULL, http_state::retries, and tcp_abort().

Referenced by http_accept().

static err_t http_recv	(	void *	arg,
		struct tcp_pcb *	pcb,
		struct pbuf *	p,
		err_t	err
	)

static

Core HTTP server receive function.

Handle the request and process it.

Parameters

arg	Pointer to structure representing the HTTP state.
pcb	Pointer to a TCP connection structure.
p	Incoming request.
err	Connection status.

Returns: ERR_OK.

References arg, cgi_search(), fs_file::data, ERR_OK, http_state::file, fs_open(), http_close_conn(), HTTP_CONTENT_HTML, HTTP_DEFAULT_PAGE, http_getPageName(), http_html_hdr_404, http_searchContentType(), http_sendInternalErr(), http_sendOk(), http_server_error, http_write(), fs_file::len, pbuf::len, NULL, pbuf::payload, pbuf_free(), req_string, tcp_recved(), and pbuf::tot_len.

Referenced by http_accept().

static int http_searchContentType ( const char * name )

static

Match content type based on filename extension.

Parameters

name	String containing a filename.

Returns: Content type index on success, 0 otherwise.

References get_ext(), HTTP_CONTENT_CNT, HTTP_CONTENT_JPEG, http_content_type, and key.

Referenced by http_recv().

static void http_send_data	(	struct tcp_pcb *	pcb,
		struct http_state *	hs
	)

static

Send HTTP data.

Parameters

pcb	Pointer to a TCP connection structure.
hs	Pointer to structure representing the HTTP state.

References ERR_MEM, ERR_OK, http_state::file, http_state::left, tcp_sndbuf, tcp_write(), and TCP_WRITE_FLAG_COPY.

Referenced by http_poll(), http_sent(), and http_write().

static void http_sendInternalErr ( int content_type )

static

Send HTTP internal server error code.

Parameters

content_type HTTP content type.

References content, http_content_type, http_html_hdr_500, and http_write().

Referenced by cgi_SetLed(), and http_recv().

static void http_sendOk ( int content_type )

static

Send the HTTP header with the appropriated content type.

Parameters

content_type Index in the http_content_type table.

References content, http_content_type, http_html_hdr_200, and http_write().

Referenced by cgi_GetStaus(), cgi_SetLed(), and http_recv().

static err_t http_sent	(	void *	arg,
		struct tcp_pcb *	pcb,
		u16_t	len
	)

static

Callback to handle data transfered.

Parameters

arg	Pointer to structure representing the HTTP state.
pcb	Pointer to a TCP connection structure.
len	Unused.

Returns: ERR_OK on success, ERR_ABRT otherwise.

References arg, ERR_OK, http_close_conn(), http_send_data(), http_state::left, LWIP_UNUSED_ARG, and http_state::retries.

Referenced by http_write().

static int http_tokenizeGetRequest	(	char *	raw_buf,
		size_t	raw_len
	)

static

Tokenize a buffer.

Parameters

raw_buf	Buffer to parse.
raw_len	Buffer length.

Returns: The number of found tokens.

Referenced by cgi_SetLed().

static void http_write	(	const char *	buf,
		u32_t	len
	)

static

Write HTTP data.

Parameters

buf	Buffer to write.
len	Buffer length.

References http_state::file, http_send_data(), http_sent(), http_state::left, and tcp_sent().

Referenced by cgi_GetStaus(), cgi_SetLed(), http_recv(), http_sendInternalErr(), and http_sendOk().

void httpd_init ( void )

HTTP server init.

References http_accept(), IP_ADDR_ANY, tcp_accept(), tcp_bind(), tcp_listen, and tcp_new().

Referenced by main().

HttpCGI cgi_table[]

Initial value:

= {
    {CGI_MATCH_NAME, "set_led", cgi_SetLed},
    {CGI_MATCH_NAME, "status", cgi_GetStaus},
    {CGI_MATCH_NONE, NULL, NULL}
}

CGI table where we associate one callback to one page.

const char* content

Referenced by http_sendInternalErr(), and http_sendOk().

char decoded_str[80]

static

Decoded message buffer.

Referenced by http_getValue().

struct http_state* g_hs

struct tcp_pcb* g_pcb

the TCP protocol control block

struct { ... } http_content_type[]

Initial value:

= {
    {"", "Content-type: application/json\r\n\r\n"},
    {"html", "Content-type: text/html\r\n\r\n"},
    {"css", "Content-type: text/css\r\n\r\n"},
    {"js", "Content-type: text/javascript\r\n\r\n"},
    {"png", "Content-type: image/png\r\n\r\n"},
    {"jpg", "Content-type: image/jpeg\r\n\r\n"},
    {"gif", "Content-type: image/gif\r\n\r\n"},
    {"txt", "Content-type: text/plain\r\n\r\n"},
}

http content type indicated with keys

Referenced by http_searchContentType(), http_sendInternalErr(), and http_sendOk().

const char http_html_hdr_200[] = "HTTP/1.0 200 OK\r\n"

static

http html header

Referenced by http_sendOk().

const char http_html_hdr_404[] = "HTTP/1.0 404 Not Found\r\n"

static

Referenced by http_recv().

const char http_html_hdr_500[] = "HTTP/1.0 500 Internal Server Error\r\n"

static

Referenced by http_sendInternalErr().

const char http_server_error[]

Initial value:

= " \
<!DOCTYPE html PUBLIC \"-//IETF//DTD HTML 2.0//EN\"> \
<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\"> \
<title>500 Internal Server error</title></head><body><h1>500 Internal Server error</h1> \
<p>The internal server error was occur while processing the requested page.</p> \
</body></html>"

http error page html

Referenced by http_recv().

const char* key

Referenced by http_searchContentType().

char key_value[80]

static

HTTP buffer to store key value.

Referenced by cgi_SetLed().

char req_string[80]

static

Handle the incoming client request.

Referenced by http_recv().