DNS-基于Bind-dlz的智能DNS实现

简介

本文主要介绍bind结合mysql实现智能dns，以centos-6 32为例安装(原文为编译安装，我搭建的是yum安装！结合之前的DNS环境部署)
注：bind 9.4.0之后的版本都已经打了dlz的补丁了！

部署过程

1、安装mysql

yum install gcc gcc-c++ openssl-devel wget ncurses-devel make
groupadd mysql
useradd -g mysql mysql -s /sbin/nologin
cd /tmp
wget http://cdn.mysql.com/Downloads/MySQL-5.1/mysql-5.1.65.tar.gz
tar xzf mysql-5.1.65.tar.gz
cd mysql-5.1.65
./configure --prefix=/usr/local/mysql/ --without-pthread --with-unix-socket-path=/tmp/mysql.sock --with-extra-charsets=gbk,gb2312,utf8
make
make install
cp support-files/my-medium.cnf /etc/my.cnf
/usr/local/mysql/bin/mysql_install_db --user=mysql
chown -R root.mysql /usr/local/mysql
chown -R mysql /usr/local/mysql/var
cp support-files/mysql.server /etc/init.d/mysqld
chown root.root /etc/rc.d/init.d/mysqld
chmod 755 /etc/rc.d/init.d/mysqld
chkconfig --add mysqld
chkconfig  mysqld on
ln -s /usr/local/mysql/bin/mysql /usr/bin
ln -s /usr/local/mysql/bin/mysqladmin /usr/bin
service mysqld start
mysqladmin -u root password root

2、安装bind

cd /tmp
wget http://ftp.isc.org/isc/bind9/cur/9.9/bind-9.9.1-P2.tar.gz
tar xzf bind-9.9.1-P2.tar.gz
cd bind-9.9.1-P2
./configure --prefix=/usr/local/bind/ --disable-openssl-version-check --with-dlz-mysql=/usr/local/mysql
make
make install

3、配置bind

cd /usr/local/bind/etc
../sbin/rndc-confgen -r /dev/urandom >rndc.conf
tail -n10 rndc.conf | head -n9 | sed -e s/#//g>named.conf

vi named.conf
在后面增加：

include "/usr/local/bind/etc/CHINANET.acl"; //联通ACL
include "/usr/local/bind/etc/CNC.acl"; //电信ACL
include "/usr/local/bind/etc/view.conf"; //DLZ相关的配置

acl文件：

注：通过如下网址进行实时更新筛选
https://tsov.net/uupee/22325/
http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest

view.conf内容：

其中需要修改的字段为user=root pass=root，即此处mysql用户为root，密码为root。

view "CHINANET_view" {
  match-clients  { CHINANET; };
  allow-query-cache { none; };
  allow-recursion { none; };
  allow-transfer { none; };
  recursion no;
 
    dlz "Mysql zone" {
    database "mysql
    {host=127.0.0.1 dbname=dns_data ssl=false port=3306 user=root pass=root}
    {select zone from dns_records where zone = '$zone$' and  view = 'any' limit 1}
    {select ttl,type,mx_priority,case when lower(type)='txt' then concat('"',data,'"') when lower(type)    =  'soa'  then   concat_ws(' ',  data,  resp_person,  serial,  refresh,  retry,  expire,  minimum)   else   data   end   as   mydata   from   dns_records where zone = '$zone$'   and host = '$record$' and view=(select view from dns_records where zone = '$zone$' and host = '$record$' and (view='CHINANET' or view='any') order by priority asc limit 1)}";
};
};
view "CNC_view" {
  match-clients  { CNC; };
  allow-query-cache { none; };
  allow-recursion { none; };
  allow-transfer { none; };
  recursion no;
 
    dlz "Mysql zone" {
    database "mysql
    {host=127.0.0.1 dbname=dns_data ssl=false port=3306 user=root pass=root}
    {select zone from dns_records where zone = '$zone$' and  view = 'any' limit 1}
    {select ttl,type,mx_priority,case when lower(type)='txt' then concat('"',data,'"') when lower(type)    =  'soa'  then   concat_ws(' ',  data,  resp_person,  serial,  refresh,  retry,  expire,  minimum)   else   data   end   as   mydata   from   dns_records where zone = '$zone$'   and host = '$record$' and view=(select view from dns_records where zone = '$zone$' and host = '$record$' and (view='CNC' or view='any') order by priority asc limit 1)}";
};
};
view "any_view" {
  match-clients  { any; };
  allow-query-cache { none; };
  allow-recursion { none; };
  allow-transfer { none; };
  recursion no;
 
    dlz "Mysql zone" {
    database "mysql
    {host=127.0.0.1 dbname=dns_data ssl=false port=3306 user=root pass=root}
    {select zone from dns_records where zone = '$zone$' and view = 'any' limit 1}
    {select ttl,type,mx_priority,case when lower(type)='txt' then concat('"',data,'"') when lower(type) = 'soa' then concat_ws(' ',data,resp_person,serial,refresh,retry,expire,minimum) else  data end as mydata from dns_records where zone = '$zone$' and host ='$record$' and view = 'any'}";
};
};

我的view.conf

view "CNC_View" {
        match-clients { CNC; };
        allow-query-cache { any; };
        #allow-recursion { none; };
        allow-transfer { none; };
        recursion no;

        dlz "Mysql zone" {
        database "mysql
        {host=127.0.0.1 dbname=dns_data ssl=false port=3306 user=root pass=root}
        {select zone from dns_CNC where zone = '$zone$'}
        {select ttl, type, mx_priority, case when lower(type)='txt' then concat('"', data, '"')
                when lower(type) = 'soa' then concat_ws(' ', data, resp_person, serial, refresh, retry, expire, minimum)
                else data end from dns_CNC where zone = '$zone$' and host = '$record$'}";
        };
};

view "CHINANET_View" {
        match-clients { CHINANET; };
        allow-query-cache { any; };
        #allow-recursion { none; };
        allow-transfer { none; };
        recursion no;

        dlz "Mysql zone" {
        database "mysql
        {host=127.0.0.1 dbname=dns_data ssl=false port=3306 user=root pass=root}
        {select zone from dns_CHINANET where zone = '$zone$'}
        {select ttl, type, mx_priority, case when lower(type)='txt' then concat('"', data, '"')
                when lower(type) = 'soa' then concat_ws(' ', data, resp_person, serial, refresh, retry, expire, minimum)
                else data end from dns_CHINANET where zone = '$zone$' and host = '$record$'}";
        };
};

view "CMCC_View" {
        match-clients { CMCC; };
        allow-query-cache { any; };
        #allow-recursion { none; };
        allow-transfer { none; };
        recursion no;

        dlz "Mysql zone" {
        database "mysql
        {host=127.0.0.1 dbname=dns_data ssl=false port=3306 user=root pass=root}
        {select zone from dns_CMCC where zone = '$zone$'}
        {select ttl, type, mx_priority, case when lower(type)='txt' then concat('"', data, '"')
                when lower(type) = 'soa' then concat_ws(' ', data, resp_person, serial, refresh, retry, expire, minimum)
                else data end from dns_CMCC where zone = '$zone$' and host = '$record$'}";
        };
};

view "OTHER_View" {
        match-clients { OTHER; };
        allow-query-cache { any; };
        #allow-recursion { none; };
        allow-transfer { none; };
        recursion no;

        dlz "Mysql zone" {
        database "mysql
        {host=127.0.0.1 dbname=dns_data ssl=false port=3306 user=root pass=root}
        {select zone from dns_OTHER where zone = '$zone$'}
        {select ttl, type, mx_priority, case when lower(type)='txt' then concat('"', data, '"')
                when lower(type) = 'soa' then concat_ws(' ', data, resp_person, serial, refresh, retry, expire, minimum)
                else data end from dns_OTHER where zone = '$zone$' and host = '$record$'}";
        };
};

4、数据库配置

mysql>create database dns_data;        //创建数据库名为 dns_data
   mysql>use dns_data;
   DROP TABLE IF EXISTS `dns_records`;
   CREATE TABLE `dns_records` (
   `id` int(10) unsigned NOT NULL auto_increment,
   `zone` varchar(255) NOT NULL,
   `host` varchar(255) NOT NULL default '@',
   `type` enum('MX','CNAME','NS','SOA','A','PTR') NOT NULL,
   `data` varchar(255) default NULL,
   `ttl` int(11) NOT NULL default '800',
   `view` char(20) default 'any',     //any 代表默认，SOA 查询需，其它可以分，CNC……
   `mx_priority` int(11) default NULL,
   `priority` int(3) default 255,  //any为255，其它如CNC,CHINANET等线路为200
   `refresh` int(11) NOT NULL default '3600',
   `retry` int(11) NOT NULL default '3600',
   `expire` int(11) NOT NULL default '86400',
   `minimum` int(11) NOT NULL default '3600',
   `serial` bigint(20) NOT NULL default '2008082700',
   `resp_person` varchar(64) NOT NULL default 'root.domain.com.',
   `primary_ns` varchar(64) NOT NULL default 'ns1.domain.com.',
   `data_count` int(11) NOT NULL default '0',
   PRIMARY KEY          (`id`),
   KEY `type` (`type`),
   KEY `host` (`host`),
   KEY `zone` (`zone`)
   ) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=gbk;

此处我使用phpMyadmin进行创建

mysql> describe dns_records;
+-------------+------------+------+-----+---------+-------+
| Field       | Type       | Null | Key | Default | Extra |
+-------------+------------+------+-----+---------+-------+
| zone        | text       | YES  |     | NULL    |       |
| host        | text       | YES  |     | NULL    |       |
| type        | text       | YES  |     | NULL    |       |
| data        | text       |      |     |         |       |
| ttl         | int(11)    | YES  |     | NULL    |       |
| mx_priority | text       | YES  |     | NULL    |       |
| refresh     | int(11)    | YES  |     | NULL    |       |
| retry       | int(11)    | YES  |     | NULL    |       |
| expire      | int(11)    | YES  |     | NULL    |       |
| minimum     | int(11)    | YES  |     | NULL    |       |
| serial      | bigint(20) | YES  |     | NULL    |       |
| resp_person | text       | YES  |     | NULL    |       |
| primary_ns  | text       | YES  |     | NULL    |       |
+-------------+------------+------+-----+---------+-------+
13 rows in set (0.00 sec)

5、启动bind服务

# /usr/local/bind/sbin/named -uroot -g -d 9 //调试状态，如果没有报错说明环境配置正确。

做成启动服务. Debug 的时候多用此模式启动bind.

# /usr/local/bind/sbin/rndc reload 重载 named.conf 相关配置文件.
# /usr/local/bind/sbin/named -uroot -c /usr/local/bind/etc/named.conf 启动 bind 服务.

6、插入记录的sql实例

--SOA
 
     INSERT INTO `dns_records` (`zone`,`host`,`type`,`data`,`ttl`,`mx_priority`,`refresh`, `retry`,`expire`,`minimum`,`serial`,`resp_person`,`primary_ns`,`data_count`) VALUES ('centos.bz', '@','SOA','ns1.centos.bz.',10,NULL,3600,3600,86400,10,2008082700,'root.centos.bz.','ns1.centos.bz.', 0);
 
--@ NS
 
     INSERT INTO `dns_records` (`zone`,`host`,`type`,`data`) VALUES ('centos.bz','@','NS','ns1.centos.bz.'),('centos.bz','@','NS','ns2.centos.bz.');
 
--NS A
     INSERT INTO `dns_records` (`zone`,`host`,`type`,`data`) VALUES ('centos.bz', 'ns1', 'A', '211.100.72.137'),   ('centos.bz', 'ns2', 'A', '219.232.244.11');
 
--A
 
     INSERT INTO `dns_records` (`zone`, `host`, `type`, `data`, `ttl`, `view`,`priority`) VALUES   ('centos.bz', 'www', 'A', '210.51.36.116', 3600, 'CNC',200), ('centos.bz', 'www', 'A','221.238.249.178', 3600, 'CHINANET',200), ('centos.bz', 'www', 'A', '211.103.156.230', 3600, 'any',255);
 
--CNAME
 
     INSERT INTO dns_records (zone,host,type,DATA,view,priority) VALUES ('centos.bz', 'man', 'CNAME', 'www','CNC',200),('centos.bz', 'man', 'CNAME', 'www','CHINANET',200), ('centos.bz', 'man', 'CNAME', 'www','any',255);