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[arm] build boa based embedded web server on nuc977

2022-06-26 05:22:00 【Boiled cabbage】

One 、 The experiment purpose

Set up based on arm Development board web Server program , Control the development board through the web page LED state

Two 、boa brief introduction

Boa The server is a small and efficient web The server , It's a program that runs on unix or linux Under the , Support CGI Of 、 Single task for embedded systems http The server , Open source 、 High performance .Boa It's a very small Web The server , Its executable code is only about 60KB about . As a single task Web The server ,Boa Only the user's requests can be completed in turn , Not fork Create a new process to handle concurrent connection requests . but Boa Support CGI, Can be CGI Program fork Create a process to execute .Boa The design goal is speed and safety .

3、 ... and 、 Source download

Download link to ：http://www.boa.org/news.html
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Four 、 Source code compilation

#  decompression 
tar- xvf boa-0.94.14rc21.tar.gz
cd boa-0.94.14rc21
#  Configuration generation makefile
./configure
#  modify makefile Compiler tools ： Here choose your own cross compiler 
vim ./src/Makefile

CC = arm-linux-gcc
CPP = arm-linux-gcc -E

#  compile 
make

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For the duration of insurance we use file Command to check whether the generated file is arm edition

Then we begin to prepare the required file configuration on the development board

mkdir nuc977
cp src/boa
cp src/boa ./nuc977/
cp examples/boa.conf ./nuc977/
cp /etc/mime.types ./nuc977/
touch ./nuc977/group
mkdir ./nuc977/www
mkdir ./nuc977/www/cgi-bin
touch ./nuc977/index.html
cd nuc977/

// If there is no example Folders can use “find ./ -name boa.conf” This command looks for the source code conf The location of the file must be
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Then transfer these files to nfs In the folder

5、 ... and 、 Development board configuration

mkdir /etc/boa
cp /mnt/nuc977/www / -rf
cp /mnt/nuc977/boa /etc/boa
cp /mnt/nuc977/boa.conf /etc/boa
cp /mnt/nuc977/mime.types /etc
cp /mnt/nuc977/group /etc
cp /mnt/nuc977/index.html /www

Then we need to modify our etc/boa/box.conf The contents of the document

Group nogroup  Change it to Group 0 //  modify nogroup by 0
ErrorLog /etc/boa/error_log  //  alternate path 
AccessLog /etc/boa/access_log //  alternate path 
ServerName www.your.org.here //  uncomment 
DocumentRoot /www  //  Modify the path 
ScriptAlias /cgi-bin/ /www/cgi-bin/  //  Modify the path

modify index.html Interface , The contents are as follows ：

 <!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>LED Control page </title>
    </head>
    <body> 
		<input type="button" value=" open "/>
		<input type="button" value=" Turn off "/>
    </body>
</html>

cd /etc/boa 
 ./boa

And then we ifconfig Check out the development board ip, And then we pc The end browser inputs this ip Address view effect
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6、 ... and 、 control led Lamp experiment

programme 1

boaapp.c file

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>

void led_on()
{
    
    char ubuf[2] = {
    1, 0};    
    int fd; 

    fd = open("/dev/led",O_RDWR);
 
    if(fd < 0)
    {
    
        printf("open runled device error\r\n");
        return;
    }   
    write(fd, ubuf, 1); 
    close(fd);
}

void led_off()
{
    
    char ubuf[2] = {
    0, 0};    
    int fd; 

    fd = open("/dev/led",O_RDWR);
 
    if(fd < 0)
    {
       
        printf("open runled device error\r\n");
        return;
    }   
    write(fd, ubuf, 1); 
    close(fd);
}

int main(void)
{
    
    char *data;

    printf("Content-Type:text/html;charset=gb2312\n\n");// It's a MIME Header information , It tells Web The subsequent output of the server is in the form of html In the form of 
    printf("<html>\n");
    printf("<body>\n");
    printf("<title>this is title</title> ");
    printf("<h3>this is h3</h3> ");
    data = getenv("QUERY_STRING");// Get the data sent by the client 
    printf("<p> The data received is :%d</p>",data);
    if(strcmp(data,"on"))
    {
    
        led_on();
    }else if(strcmp(data,"off"))
    {
    
        led_off();
    }
    printf("</body>\n");
    printf("</html>\n");

    // free(data);
    return 0;
}

compile

arm-linux-gcc boaapp.c -o boaapp.cgi -static

Then we copy the compiled file to the development board www/cgi-bin In the folder , Then we go to the browser to access , Then all the time there are mistakes , Through experiments, we can know that the problem lies in the function getenv On （http://192.168.1.3/cgi-bin/boaapp.cgi）
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As long as you comment out here, you can access it normally

programme 2

download https://github.com/boutell/cgic
modify cgictest.c

#include"cgic.h"
#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>

void led_on()
{
    
    char ubuf[2] = {
    1, 0};     
    int fd;

    fd = open("/dev/led",O_RDWR);
 
    if(fd < 0)
    {
    
        printf("<p align=\"center\">open onled device error<\p>>");
        return;
    }
    write(fd, ubuf, 1);
    close(fd);
}

void led_off()
{
    
    char ubuf[2] = {
    0, 0};     
    int fd;

    fd = open("/dev/led",O_RDWR);
 
    if(fd < 0)
    {
    
        printf("<p align=\"center\">open offled device error<\p>>");
        return;
    }
    write(fd, ubuf, 1);
    close(fd);
}
int cgiMain()
{
     
	char state[10]; 
	// cgiFormString("led_num", led_num, 10); //  From the form led_num Field get value stored in led_num 
	cgiFormString("state", state, 10);//  From the form led_state Field get value stored in led_state 
	cgiHeaderContentType("text/html"); //  Set the output content format   Here we want to output HTML
	fprintf(cgiOut,"<title>LED Test</title>"); 
	fprintf(cgiOut,"<p align=\"center\">recv from arm:</p>");
	fprintf(cgiOut,"<form action=\"cgictest.cgi\" align=\"center\">LED_STATE<br><input type=\"text\" name=\"state\" \ value=\"on\"><br><input type=\"submit\" value=\"push\"></form>");
	// fprintf(cgiOut,"led_num: %s", led_num);
	fprintf(cgiOut,"<br> <p align=\"center\">state: %s</p>", state);
	
	if(!strcmp(state,"on"))
    {
    
        led_on();
		system("echo 1>/dev/led");
    }else if(!strcmp(state,"off"))
    {
    
        led_off();
		system("echo 0>/dev/led");
    }
	
	return 0;
}

modify makefile： Reference resources

CFLAGS=-g -Wall
CC=arm-linux-gcc
AR=arm-linux-ar
RANLIB=arm-linux-ranlib
LIBS=-L./ -lcgic

all: libcgic.a cgictest.cgi

install: libcgic.a
	cp libcgic.a /usr/local/lib
	cp cgic.h /usr/local/include
	@echo libcgic.a is in /usr/local/lib. cgic.h is in /usr/local/include.

libcgic.a: cgic.o cgic.h
	rm -f libcgic.a
	$(AR) rc libcgic.a cgic.o
	$(RANLIB) libcgic.a

#mingw32 and cygwin users: replace .cgi with .exe

cgictest.cgi: cgictest.o libcgic.a
	$(CC) cgictest.o -o cgictest.cgi ${LIBS}

clean:
	rm -f *.o *.a cgictest.cgi capture cgicunittest

test:
	$(CC) -D UNIT_TEST=1 cgic.c -o cgicunittest
	./cgicunittest

Final directory composition
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perform make And then what will be generated .cgi Copy the file to the board www/cgi-bin Directory and then open the browser
Final effect （ at present ）