lwip/raw_http_basic_example_ajax/network/httpserver/httpd.c File Reference

Httpd server.

Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.

#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(), len, 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, i, 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, 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, and http_state::retries.

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(), and NULL.

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 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(), and i.

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.

References i.

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, http_decodeUrl(), and i.

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

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 buf, buflen, cgi_search(), fs_file::data, ERR_OK, http_state::file, fs_open(), g_pcb, 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, 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, i, 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, ERR_MEM, ERR_OK, http_state::file, http_state::left, and len.

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 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.

References i.

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 buf, http_state::file, g_pcb, http_send_data(), http_sent(), http_state::left, and len.

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

void httpd_init

(

void

)

HTTP server init.

References http_accept(), httpd_cgi_init(), led_socket, led_socket_callback(), memb_init(), NULL, tcp_listen(), udp_socket_bind(), udp_socket_register(), and UIP_HTONS.

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 handle_tcpip_recv(), 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

Referenced by http_recv(), and http_write().

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(), http_sendOk(), and parse_headers().

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 _load_setting_from_sd(), adc_calibration(), http_searchContentType(), index_from_lladdr(), main(), nbr_table_add_lladdr(), nbr_table_allocate(), nbr_table_get_lladdr(), nbr_table_next(), netstack_aes_decrypt(), netstack_aes_encrypt(), netstack_aes_set_key(), netstack_aes_set_master_key(), and netstack_aes_verify().

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().

u8_t tx_buf[CONFIG_AFSK_TX_BUFLEN]