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/* Copyright (c) 2001, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* httpd.c
*
* Author : Adam Dunkels <adam@sics.se>
*
*/
#include "httpserver.h"
#include "lwip/tcp.h"
#include "fsdata.c"
#include "main.h"
#include "flash_if.h"
#include "lcd_log.h"
#include <string.h>
#include <stdio.h>
#ifdef USE_IAP_HTTP
static __IO uint32_t DataFlag=0;
static __IO uint32_t size =0;
static __IO uint32_t FlashWriteAddress;
static uint32_t TotalReceived=0;
static char LeftBytesTab[4];
static uint8_t LeftBytes=0;
static __IO uint8_t resetpage=0;
static uint32_t ContentLengthOffset =0,BrowserFlag=0;
static __IO uint32_t TotalData=0, checklogin=0;
struct http_state
{
char *file;
u32_t left;
};
typedef enum
{
LoginPage = 0,
FileUploadPage,
UploadDonePage,
ResetDonePage
}htmlpageState;
htmlpageState htmlpage;
static const char http_crnl_2[4] =
/* "\r\n--" */
{0xd, 0xa,0x2d,0x2d};
static const char octet_stream[14] =
/* "octet-stream" */
{0x6f, 0x63, 0x74, 0x65, 0x74, 0x2d, 0x73, 0x74, 0x72, 0x65, 0x61, 0x6d,0x0d, };
static const char Content_Length[17] =
/* Content Length */
{0x43, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74, 0x2d, 0x4c, 0x65, 0x6e, 0x67,0x74, 0x68, 0x3a, 0x20, };
static uint32_t Parse_Content_Length(char *data, uint32_t len);
static void IAP_HTTP_writedata(char* data, uint32_t len);
/* file must be allocated by caller and will be filled in
by the function. */
static int fs_open(char *name, struct fs_file *file);
/**
* @brief callback function for handling connection errors
* @param arg: pointer to an argument to be passed to callback function
* @param err: LwIP error code
* @retval None
*/
static void conn_err(void *arg, err_t err)
{
struct http_state *hs;
hs = arg;
mem_free(hs);
}
/**
* @brief closes tcp connection
* @param pcb: pointer to a tcp_pcb struct
* @param hs: pointer to a http_state struct
* @retval
*/
static void close_conn(struct tcp_pcb *pcb, struct http_state *hs)
{
tcp_arg(pcb, NULL);
tcp_sent(pcb, NULL);
tcp_recv(pcb, NULL);
mem_free(hs);
tcp_close(pcb);
}
/**
* @brief sends data found in member "file" of a http_state struct
* @param pcb: pointer to a tcp_pcb struct
* @param hs: pointer to a http_state struct
* @retval None
*/
static void send_data(struct tcp_pcb *pcb, struct http_state *hs)
{
err_t err;
u16_t len;
/* We cannot send more data than space available in the send
buffer */
if (tcp_sndbuf(pcb) < hs->left)
{
len = tcp_sndbuf(pcb);
}
else
{
len = hs->left;
}
err = tcp_write(pcb, hs->file, len, 0);
if (err == ERR_OK)
{
hs->file += len;
hs->left -= len;
}
}
/**
* @brief tcp poll callback function
* @param arg: pointer to an argument to be passed to callback function
* @param pcb: pointer on tcp_pcb structure
* @retval err_t
*/
static err_t http_poll(void *arg, struct tcp_pcb *pcb)
{
if (arg == NULL)
{
tcp_close(pcb);
}
else
{
send_data(pcb, (struct http_state *)arg);
}
return ERR_OK;
}
/**
* @brief callback function called after a successful TCP data packet transmission
* @param arg: pointer to an argument to be passed to callback function
* @param pcb: pointer on tcp_pcb structure
* @param len
* @retval err : LwIP error code
*/
static err_t http_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
{
struct http_state *hs;
hs = arg;
if (hs->left > 0)
{
send_data(pcb, hs);
}
else
{
close_conn(pcb, hs);
if(resetpage ==1)
{
/* Generate a software reset */
NVIC_SystemReset();
}
}
return ERR_OK;
}
/**
* @brief callback function for handling TCP HTTP traffic
* @param arg: pointer to an argument structure to be passed to callback function
* @param pcb: pointer to a tcp_pcb structure
* @param p: pointer to a packet buffer
* @param err: LwIP error code
* @retval err
*/
static err_t http_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
int32_t i,len=0;
uint32_t DataOffset, FilenameOffset;
char *data, *ptr, filename[40], login[LOGIN_SIZE+1];
struct fs_file file = {0, 0};
struct http_state *hs;
struct pbuf *ptmp = p;
#ifdef USE_LCD
char message[46];
#endif
hs = arg;
if (err == ERR_OK && p != NULL)
{
/* Inform TCP that we have taken the data */
tcp_recved(pcb, p->tot_len);
if (hs->file == NULL)
{
data = p->payload;
len = p->tot_len;
/* process HTTP GET Login page requests */
if (strncmp(data, "GET / HTTP", 10) == 0)
{
/*send the login page (which is the index page) */
htmlpage = LoginPage;
fs_open("/index.html", &file);
hs->file = file.data;
hs->left = file.len;
pbuf_free(p);
/* send index.html page */
send_data(pcb, hs);
/* Tell TCP that we wish be to informed of data that has been
successfully sent by a call to the http_sent() function. */
tcp_sent(pcb, http_sent);
}
/* process HTTP GET reset mcu requests */
else if ((strncmp(data, "GET /resetmcu.cgi", 17) ==0)&&(htmlpage == UploadDonePage))
{
htmlpage = ResetDonePage;
fs_open("/reset.html", &file);
hs->file = file.data;
hs->left = file.len;
pbuf_free(p);
/* send reset.html page */
send_data(pcb, hs);
resetpage = 1;
/* Tell TCP that we wish be to informed of data that has been
successfully sent by a call to the http_sent() function. */
tcp_sent(pcb, http_sent);
}
/* process POST request for checking login */
else if ((strncmp(data, "POST /checklogin.cgi",20)==0)&&(htmlpage== LoginPage))
{
/* parse packet for the username & password */
for (i=0;i<len;i++)
{
if (strncmp ((char*)(data+i), "username=", 9)==0)
{
sprintf((char *)login,"username=%s&password=%s",USERID,PASSWORD);
if (strncmp((char*)(data+i), (char *)login ,LOGIN_SIZE)==0)
{
htmlpage = FileUploadPage;
fs_open("/upload.html", &file);
}
else
{
htmlpage = LoginPage;
/* reload index.html */
fs_open("/index.html", &file);
}
hs->file = file.data;
hs->left = file.len;
pbuf_free(p);
/* send index.html page */
send_data(pcb, hs);
/* Tell TCP that we wish be to informed of data that has been
successfully sent by a call to the http_sent() function. */
tcp_sent(pcb, http_sent);
break;
}
}
/* process POST request for file upload and incoming data packets after POST request*/
else if (((strncmp(data, "POST /upload.cgi",16)==0)||(DataFlag >=1))&&(htmlpage == FileUploadPage))
{
DataOffset =0;
/* POST Packet received */
if (DataFlag ==0)
{
BrowserFlag=0;
TotalReceived =0;
/* parse packet for Content-length field */
size = Parse_Content_Length(data, (uint32_t)(p->tot_len));
/* parse packet for the octet-stream field */
for (i=0;i<len;i++)
{
if (strncmp ((char*)(data+i), octet_stream, 13)==0)
{
DataOffset = i+16;
break;
}
}
if (((DataFlag ==1)&&(BrowserFlag==1)) || ((DataFlag ==0)&&(BrowserFlag==0)))
{
if ((DataFlag ==0)&&(BrowserFlag==0))
{
DataFlag++;
}
else if ((DataFlag ==1)&&(BrowserFlag==1))
{
/* parse packet for the octet-stream field */
for (i=0;i<len;i++)
{
if (strncmp ((char*)(data+i), octet_stream, 13)==0)
{
DataOffset = i+16;
break;
}
}
/* parse packet for the filename field */
FilenameOffset = 0;
for (i=0;i<len;i++)
{
if (strncmp ((char*)(data+i), "filename=", 9)==0)
{
FilenameOffset = i+10;
break;
}
}
/* DataFlag >1 => the packet is data only */
else
{
TotalReceived +=len;
}
ptr = (char*)(data + DataOffset);
len-= DataOffset;
/* update Total data received counter */
TotalData +=len;
/* check if last data packet */
if (TotalReceived == size)
{
/* if last packet need to remove the http boundary tag */
/* parse packet for "\r\n--" starting from end of data */
i=4;
while (strncmp ((char*)(data+ p->tot_len -i),http_crnl_2 , 4) && (p->tot_len -i > 0))
{
i++;
}
len-=i;
TotalData-=i;
/* write data in Flash */
if (len)
IAP_HTTP_writedata(ptr,len);
DataFlag=0;
#ifdef USE_LCD
sprintf(message, "%d bytes ",(int)TotalData);
LCD_UsrLog("Tot bytes Received: %s\n", message);
LCD_UsrLog(" State: Prog Finished ");
#endif
htmlpage = UploadDonePage;
/* send uploaddone.html page */
fs_open("/uploaddone.html", &file);
hs->file = file.data;
hs->left = file.len;
send_data(pcb, hs);
/* Tell TCP that we wish be to informed of data that has been
successfully sent by a call to the http_sent() function. */
tcp_sent(pcb, http_sent);
}
/* not last data packet */
else
{
/* write data in flash */
len = ptmp->len;
len-= DataOffset;
/* write data in flash */
while(ptmp != NULL)
{
if(len)
IAP_HTTP_writedata(ptr,len);
ptmp = ptmp->next;
len = ptmp->len;
ptr = ptmp->payload;
}
}
pbuf_free(p);
}
else
{
/* Bad HTTP requests */
#ifdef USE_LCD
LCD_ErrLog("Bad HTTP request\n");
#endif
close_conn(pcb, hs);
}
}
else
{
pbuf_free(p);
close_conn(pcb,hs);
}
}
if (err == ERR_OK && p == NULL)
{
/* received empty frame */
close_conn(pcb, hs);
}
return ERR_OK;
}
/**
* @brief callback function on TCP connection setup ( on port 80)
* @param arg: pointer to an argument structure to be passed to callback function
* @param pcb: pointer to a tcp_pcb structure
* ¶m err: Lwip stack error code
* @retval err
*/
static err_t http_accept(void *arg, struct tcp_pcb *pcb, err_t err)
{
struct http_state *hs;
/* Allocate memory for the structure that holds the state of the connection */
hs = mem_malloc(sizeof(struct http_state));
if (hs == NULL)
{
return ERR_MEM;
}
/* Initialize the structure. */
hs->file = NULL;
hs->left = 0;
/* Tell TCP that this is the structure we wish to be passed for our
callbacks. */
tcp_arg(pcb, hs);
/* Tell TCP that we wish to be informed of incoming data by a call
to the http_recv() function. */
tcp_recv(pcb, http_recv);
tcp_err(pcb, conn_err);
tcp_poll(pcb, http_poll, 10);
return ERR_OK;
}
/**
* @brief initialize HTTP webserver
* @param none
* @retval None
*/
void IAP_httpd_init(void)
{
struct tcp_pcb *pcb;
/*create new pcb*/
pcb = tcp_new();
/* bind HTTP traffic to pcb */
tcp_bind(pcb, IP_ADDR_ANY, 80);
/* start listening on port 80 */
pcb = tcp_listen(pcb);
/* define callback function for TCP connection setup */
tcp_accept(pcb, http_accept);
}
/**
* @brief Opens a file defined in fsdata.c ROM filesystem
* @param name : pointer to a file name
* @param file : pointer to a fs_file structure
* @retval 1 if success, 0 if fail
*/
static int fs_open(char *name, struct fs_file *file)
{
struct fsdata_file_noconst *f;
for (f = (struct fsdata_file_noconst *)FS_ROOT; f != NULL; f = (struct fsdata_file_noconst *)f->next)
{
if (!strcmp(name, f->name))
{
file->data = f->data;
file->len = f->len;
return 1;
}
}
return 0;
}
/**
* @brief Extract the Content_Length data from HTML data
* @param data : pointer on receive packet buffer
* @param len : buffer length
* @retval size : Content_length in numeric format
*/
static uint32_t Parse_Content_Length(char *data, uint32_t len)
{
uint32_t i=0,size=0, S=1;
int32_t j=0;
char sizestring[6], *ptr;
ContentLengthOffset =0;
/* find Content-Length data in packet buffer */
for (i=0;i<len;i++)
{
if (strncmp ((char*)(data+i), Content_Length, 16)==0)
{
ContentLengthOffset = i+16;
break;
}
}
/**
* @brief writes received data in flash
* @param ptr: data pointer
* @param len: data length
* @retval None
*/
static void IAP_HTTP_writedata(char * ptr, uint32_t len)
{
uint32_t count, i=0, j=0;
/* check if any left bytes from previous packet transfer*/
/* if it is the case do a concat with new data to create a 32-bit word */
if (LeftBytes)
{
while(LeftBytes<=3)
{
if(len>(j+1))
{
LeftBytesTab[LeftBytes++] = *(ptr+j);
}
else
{
LeftBytesTab[LeftBytes++] = 0xFF;
}
j++;
}
FLASH_If_Write(&FlashWriteAddress, (uint32_t*)(LeftBytesTab),1);
LeftBytes =0;
/* update data pointer */
ptr = (char*)(ptr+j);
len = len -j;
}
/* write received bytes into flash */
count = len/4;
/* check if remaining bytes < 4 */
i= len%4;
if (i>0)
{
if (TotalReceived != size)
{
/* store bytes in LeftBytesTab */
LeftBytes=0;
for(;i>0;i--)
LeftBytesTab[LeftBytes++] = *(char*)(ptr+ len-i);
}
else count++;
}
FLASH_If_Write(&FlashWriteAddress, (uint32_t*)ptr ,count);
}
#endif
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/