嵌入式web服务器boa的测试

在移动互联网的时代，我们希望通过internet控制手持终端设备，故而手持设备上运行轻型、占用内存小的web服务器成为必要的选择。

本学期想要通过zedboard实现开发一款机器人，主要通过手机客户端或者电脑进行控制。想到移植web服务器到zedboard，通过web页面或则客户端进行控制。

我使用嵌入式boa服务器，其下载地址如下：boa

下载boa-0.94.13.tar.gz解压缩文件：

tar xvzf boa-0.94.13.tar.gz

进入目录boa-0.94.13/src，执行脚本./configure生成Makefile文件。

我们本次在本机测试，默认即可，不需要对Makefile进行修改。

如果要移植到zedboard，需要修改Makefile文件。修改其中的CC=arm-xilinx-linux-gnueabi-gcc CPP=arm-xilinx-linux-gnueabi-g++

接下来，我们需要对boa.c做一小小的改动，vim打开boa.c，找到225～227行，注释掉这三行，然后保存退出。

/*if (setuid(0) != -1) {
DIE(“icky Linux kernel bug!”);
}*/

然后再修改compat.h，修改位置如下：

#define TIMEZONE_OFFSET(foo) foo## ->tm_gmtoff

修改为
#define TIMEZONE_OFFSET(foo) foo ->tm_gmtoff

修改完上述两个位置后，直接make，在当前的src目录下就会生成可执行文件boa。

接下来，我们对boa服务器进行配置。

回到源文件下，找到boa.conf，打开此文件进行配置。需要修改的几个地方如下：

User nobody
Group nogroup
改为
User 0
Group 0

DocumentRoot /var/www/boa #定义html文件的主目录

DirectoryIndex index.html #默认的html访问文件

ScriptAlias /cgi-bin/ /var/www/boa/cgi-bin/ #输入站点cgi程序位置

配置好的boa.conf如下：

Port 80
# Listen: the Internet address to bind(2) to.  If you leave it out,
# it takes the behavior before 0.93.17.2, which is to bind to all
# addresses (INADDR_ANY).  You only get one "Listen" directive,
# if you want service on multiple IP addresses, you have three choices:
#    1. Run boa without a "Listen" directive
#       a. All addresses are treated the same; makes sense if the addresses
#          are localhost, ppp, and eth0.
#       b. Use the VirtualHost directive below to point requests to different
#          files.  Should be good for a very large number of addresses (web
#          hosting clients).
#    2. Run one copy of boa per IP address, each has its own configuration
#       with a "Listen" directive.  No big deal up to a few tens of addresses.
#       Nice separation between clients.
# The name you provide gets run through inet_aton(3), so you have to use dotted
# quad notation.  This configuration is too important to trust some DNS.

#Listen 192.68.0.5

#  User: The name or UID the server should run as.
# Group: The group name or GID the server should run as.

#User nobody
#Group nogroup
User 0
Group 0
# ServerAdmin: The email address where server problems should be sent.
# Note: this is not currently used, except as an environment variable
# for CGIs.

#ServerAdmin root@localhost

# ErrorLog: The location of the error log file. If this does not start
# with /, it is considered relative to the server root.
# Set to /dev/null if you don't want errors logged.
# If unset, defaults to /dev/stderr

ErrorLog /var/log/boa/error_log
# Please NOTE: Sending the logs to a pipe ('|'), as shown below,
#  is somewhat experimental and might fail under heavy load.
# "Usual libc implementations of printf will stall the whole
#  process if the receiving end of a pipe stops reading."
#ErrorLog "|/usr/sbin/cronolog --symlink=/var/log/boa/error_log /var/log/boa/error-%Y%m%d.log"

# AccessLog: The location of the access log file. If this does not
# start with /, it is considered relative to the server root.
# Comment out or set to /dev/null (less effective) to disable
# Access logging.

AccessLog /var/log/boa/access_log
# Please NOTE: Sending the logs to a pipe ('|'), as shown below,
#  is somewhat experimental and might fail under heavy load.
# "Usual libc implementations of printf will stall the whole
#  process if the receiving end of a pipe stops reading."
#AccessLog  "|/usr/sbin/cronolog --symlink=/var/log/boa/access_log /var/log/boa/access-%Y%m%d.log"

# UseLocaltime: Logical switch.  Uncomment to use localtime
# instead of UTC time
#UseLocaltime

# VerboseCGILogs: this is just a logical switch.
#  It simply notes the start and stop times of cgis in the error log
# Comment out to disable.

#VerboseCGILogs

# ServerName: the name of this server that should be sent back to
# clients if different than that returned by gethostname + gethostbyname

ServerName www.ballrobot.net

# VirtualHost: a logical switch.
# Comment out to disable.
# Given DocumentRoot /var/www, requests on interface 'A' or IP 'IP-A'
# become /var/www/IP-A.
# Example: http://localhost/ becomes /var/www/127.0.0.1
#
# Not used until version 0.93.17.2.  This "feature" also breaks commonlog
# output rules, it prepends the interface number to each access_log line.
# You are expected to fix that problem with a postprocessing script.

#VirtualHost

# DocumentRoot: The root directory of the HTML documents.
# Comment out to disable server non user files.

DocumentRoot /var/www/boa

# UserDir: The name of the directory which is appended onto a user's home
# directory if a ~user request is recieved.

UserDir public_html

# DirectoryIndex: Name of the file to use as a pre-written HTML
# directory index.  Please MAKE AND USE THESE FILES.  On the
# fly creation of directory indexes can be _slow_.
# Comment out to always use DirectoryMaker

DirectoryIndex index.html

# DirectoryMaker: Name of program used to create a directory listing.
# Comment out to disable directory listings.  If both this and
# DirectoryIndex are commented out, accessing a directory will give
# an error (though accessing files in the directory are still ok).

DirectoryMaker /usr/lib/boa/boa_indexer

# DirectoryCache: If DirectoryIndex doesn't exist, and DirectoryMaker
# has been commented out, the the on-the-fly indexing of Boa can be used
# to generate indexes of directories. Be warned that the output is
# extremely minimal and can cause delays when slow disks are used.
# Note: The DirectoryCache must be writable by the same user/group that
# Boa runs as.

# DirectoryCache /var/spool/boa/dircache

# KeepAliveMax: Number of KeepAlive requests to allow per connection
# Comment out, or set to 0 to disable keepalive processing

KeepAliveMax 1000

# KeepAliveTimeout: seconds to wait before keepalive connection times out

KeepAliveTimeout 10

# MimeTypes: This is the file that is used to generate mime type pairs
# and Content-Type fields for boa.
# Set to /dev/null if you do not want to load a mime types file.
# Do *not* comment out (better use AddType!)

MimeTypes /etc/mime.types

# DefaultType: MIME type used if the file extension is unknown, or there
# is no file extension.

DefaultType text/plain

# CGIPath: The value of the $PATH environment variable given to CGI progs.

CGIPath /bin:/usr/bin:/usr/local/bin

# SinglePostLimit: The maximum allowable number of bytes in
# a single POST.  Default is normally 1MB.

# AddType: adds types without editing mime.types
# Example: AddType type extension [extension ...]

# Uncomment the next line if you want .cgi files to execute from anywhere
#AddType application/x-httpd-cgi cgi

# Redirect, Alias, and ScriptAlias all have the same semantics -- they
# match the beginning of a request and take appropriate action.  Use
# Redirect for other servers, Alias for the same server, and ScriptAlias
# to enable directories for script execution.

# Redirect allows you to tell clients about documents which used to exist in
# your server's namespace, but do not anymore. This allows you to tell the
# clients where to look for the relocated document.
# Example: Redirect /bar http://elsewhere/feh/bar 
# Aliases: Aliases one path to another.
# Example: Alias /path1/bar /path2/foo

Alias /doc /usr/doc

# ScriptAlias: Maps a virtual path to a directory for serving scripts
# Example: ScriptAlias /htbin/ /www/htbin/

ScriptAlias /cgi-bin/ /var/www/boa/cgi-bin/

然后执行如下命令：

mkdir /etc/boa
mkdir /var/www/boa
mkdir /var/www/boa/cgi-bin
cp {编译boa的路径}/src/boa  /etc/boa
cp {编译boa的路径}/src/boa  /sbin  #方便boa启动
cp {编译boa的路径}/boa.conf /etc/boa

cp /etc/mime.typs /etc/boa
cp /etc/boa/* /var/www/boa/ -rf

这里需要注意的是，boa服务器默认的启动路径为/etc/boa，所以一定要在/etc/目录下建立boa文件夹，并将boa、boa.conf、mime.types三个文件复制到此目录下。

同理移植到zedboard上同样需要这样。

完成以上步骤后，我们在/var/www/boa/目录下新建index.html。

<html>

<head>

<title>Boa local test</title>

</head>

<body>

<test>hello codeworld!!!</test>

<p><a href="./cgi-bin/a.out">cgi in the boa server</a></p>

</body>

</html>

在/var/www/boa/cgi-bin目录下建立cgi测试程序：

#include <stdio.h>

int main()

{

printf("Content-Type:text/html\r\n\r\n");

printf("<html><head>\n");

printf("<title>cgi</title>\n");

printf("</head>\n");

printf("<body>\n");

printf("<hello>OBB-damn it!!!</hello>\n");

printf("<p>this is a demo of cgi in the boa server</p>\n");

printf("<html><head>\n");

return 0;

}

直接gcc cgi-test生成a.out文件。

接下来，我们测试boa服务器。终端键入boa&，后台运行boa服务器。

打开浏览器键入127.0.0.1即可测试