httpd.c File Reference

Httpd server.

Copyright (c) 2013-2018 Microchip Technology Inc. and its subsidiaries.

#include "lwipopts.h"
#include "lwip/ip.h"
#include <string.h>
#include "lwip/tcp.h"
#include "fs.h"
#include "afec.h"
#include "httpd.h"
#include "cgi.h"

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

Macros
#define	HTTP_DEFAULT_PAGE   "index.html"
#define	STEP_AT_27C   144 * 4096 / 330

Functions
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...
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...
void	http_init (void)
	HTTP server init. 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...
void	http_sendInternalErr (int content_type)
	Send HTTP internal server error code. More...
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...
int	http_tokenizeGetRequest (char *raw_buf, size_t raw_len)
	Tokenize a buffer. More...
void	http_write (const char *buf, u32_t len)
	Write HTTP data. More...

Variables
static char	decoded_str [80]
struct http_state *	g_hs
struct tcp_pcb *	g_pcb
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	req_string [80]
	Handle the incoming client request. More...
BoardStatus	status
	board status info More...

#define HTTP_DEFAULT_PAGE   "index.html"

Referenced by http_recv().

#define STEP_AT_27C   144 * 4096 / 330

Referenced by http_accept().

const char* get_ext

(

const char *

name

)

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 afec_channel_get_value(), AFEC_TEMPERATURE_SENSOR, ERR_MEM, ERR_OK, http_state::file, http_conn_err(), http_poll(), http_recv(), BoardStatus::internal_temp, http_state::left, LWIP_UNUSED_ARG, mem_malloc(), NULL, http_state::retries, STEP_AT_27C, tcp_arg(), tcp_err(), tcp_poll(), TCP_PRIO_MIN, tcp_recv(), and tcp_setprio().

Referenced by http_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().

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.

Parameters

tolenized_buf	.
tolenized_buf_len	.
key	.
value
len	.

References decoded_str, and http_decodeUrl().

Referenced by cgi_displayMsg(), and cgi_led().

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().

void http_init

(

void

)

HTTP server init.

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

Referenced by init_ethernet().

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 requests and process them.

Parameters

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

Returns

ERR_OK.

References arg, cgi_search(), cgi_table, 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().

void http_sendInternalErr

(

int

content_type

)

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_displayMsg(), cgi_led(), and http_recv().

void http_sendOk

(

int

content_type

)

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_chipInfo(), cgi_displayMsg(), cgi_echo(), cgi_led(), cgi_ledStatus(), cgi_resistor(), cgi_status(), cgi_temp(), cgi_uptime(), 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().

int http_tokenizeGetRequest	(	char *	raw_buf,
		size_t	raw_len
	)

Tokenize a buffer.

Parameters

raw_buf	Buffer to parse.
raw_len	Buffer length.

Returns

The number of found tokens.

Referenced by cgi_displayMsg(), and cgi_led().

void http_write	(	const char *	buf,
		u32_t	len
	)

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_chipInfo(), cgi_echo(), cgi_led(), cgi_ledStatus(), cgi_resistor(), cgi_status(), cgi_temp(), cgi_uptime(), http_recv(), http_sendInternalErr(), and http_sendOk().

const char* content

Referenced by http_sendInternalErr(), and http_sendOk().

char decoded_str[80]

static

Referenced by http_getValue().

struct http_state* g_hs

struct tcp_pcb* g_pcb

Referenced by cgi_status().

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 req_string[80]

static

Handle the incoming client request.

Referenced by http_recv().

BoardStatus status

board status info

Referenced by afec_process_callback(), cgi_led(), cgi_ledStatus(), cgi_status(), cgi_temp(), cgi_uptime(), pio_handler_process(), twi_master_init(), twi_master_read(), twi_master_write(), twi_slave_read(), and twi_slave_write().