CentOS7.x上轻量级TCP转发工具rinetd的安装配置

【rinetd】CentOS7.x上轻量级TCP转发工具rinetd的安装配置

一、实验背景

Linux下端口转发一般都使用iptables来实现,使用iptables可以很容易将TCP和UDP端口从防火墙转发到内部主机上。

如果需要将流量从专用地址转发到不在您当前网络上的机器上,可尝试另一个应用层端口转发程序rinetd,配置起来比iptables也简单很多。

Rinetd是为在一个Unix和Linux操作系统中为重定向传输控制协议(TCP)连接的一个工具。Rinetd是单一过程的服务器,它处理任何数量的连接到在配置文件etc/rinetd中指定的地址/端口对,尽管rinetd使用非闭锁I/O运行作为一个单一过程,它可能重定向很多连接而不对这台机器增加额外的负担。

虽然这些代码有点古老,版本很多年没有更新了,但很短小、高效,对于解决这种问题来说是非常完美的。

二、实验环境

操作系统: CentOS7.5 Minimal

rinted服务器: 192.168.1.103

Backend服务器: 192.168.1.107

三、安装rinetd

安装rinted方式主要有两种:rpm包安装和源码编译安装

rpm安装方式

网上有人用源码包编译了rpm安装包,联网的情况下我们可以直接配置yum源安装,离线的情况下我们可以将下载的rpm包拷贝到无网的服务器,因为主包没有依赖,安装显得异常简单方便。

配置yum仓库安装

#  vim /etc/yum.repos.d/nux-misc.repo

####################################################

[nux-misc]

name=Nux Misc

baseurl=http://li.nux.ro/download/nux/misc/el7/x86_64/

enabled=0

gpgcheck=1

gpgkey=http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro

#######################################################

# yum  -y install  rinetd  –disablerepo=”*”  –enablerepo=nux-misc

# wget  http://li.nux.ro/download/nux/misc/el7/x86_64//rinetd-0.62-9.el7.nux.x86_64.rpm

# rpm  -ivh  rinetd-0.62-9.el7.nux.x86_64.rpm

# rpm -ql  rinetd

# cat  /etc/rc.d/init.d/rinetd

# cat /etc/rinetd.conf

# /usr/sbin/rinetd  –help

#  /usr/sbin/rinetd  -v

# systemctl  status rinetd

源码编译安装

#  yum  -y install  gcc make

# wget http://www.boutell.com/rinetd/http/rinetd.tar.gz

# tar  -zxf  rinetd.tar.gz

# cd rinetd

#  mkdir -p /usr/man/man8

# make && make install

# which rinetd

# /usr/sbin/rinetd –help

# /usr/sbin/rinetd -v

# man rinetd

# man rinetd  > rinetd.txt

四、将源码编译安装注册成系统服务

# mkdir /usr/local/rinetd

# mkdir /usr/local/rinetd/sbin

# mkdir /usr/local/rinetd/etc/

# mkdir /usr/local/rinetd/log

# mv  /usr/sbin/rinetd  /usr/local/rinetd/sbin

#  vim /usr/local/rinetd/etc/rinetd.conf

#############################################################

# example configuration file for rinetd

# to forward connections to port 80 on 10.10.10.2 to port 80 on 192.168.0.2

#  10.10.10.2 80 192.168.0.2 80

# to forward connections to port 80 on all addresses to port 80 on 192.168.0.2

# 0.0.0.0 80 192.168.0.2 80

# access controls can be set with allow and deny rules

# allow and deny before the first forwarding rule are global

# allow and deny after a specific rule apply to it only

# this rule allows hosts from 172.16.32.0/24 netblock

# allow 172.16.32.*

# this rule denies the host 192.168.32.12

# deny 192.168.32.12

# rinetd supports logging – to enable, uncomment the following

# logfile /var/log/rinetd.log

# by default, logs are in a tab-delimited format. Web common-log format

# is available by uncommenting the following

# logcommon

#############################################################

编写Unit文件

#  vim  /etc/systemd/system/rinetd.service

##########################################################

[Unit]

Description=Rinetd Daemon

After=network.service

Wants=network.service

[Service]

Type=forking

PIDFile=/var/run/rinetd.pid

ExecStart=/usr/local/rinetd/sbin/rinetd -c /usr/local/rinetd/etc/rinetd.conf

Restart=on-failure

[Install]

WantedBy=multi-user.target

###############################################################

#  systemctl  daemon-reload

# systemctl  start    rinetd.service

# systemctl  enable  rinetd.service

# systemctl  status  rinetd.service

rinetd  用于网络端口转发,运行用户只能是root

五、关于rinetd 的配置文件的配置

rpm安装的配置文件默认路径是/etc/rinetd.conf,本实验中我们将编译安装的配置文件  /usr/local/rinetd/etc/rinetd.conf

注意:源端口转发到目标端口时,源端口要是空闲端口,否则会报端口已被占用

关于配置文件的更多其他配置,见参考文档

 

六、端口转发测试

实验:将rinted服务器(192.168.1.103)的6033端口转到Backend服务器(192.168.1.107)的3306

在Backend服务器(192.168.1.107)

# systemctl  status mysqld

# ss  -tan | grep 3306

# firewall-cmd –zone=public–add-port=3306/tcp –permanent

# firewall-cmd –reload

在rinted服务器(192.168.1.103)

# firewall-cmd –zone=public–add-port=6033/tcp –permanent

# firewall-cmd –reload

# vim  /usr/local/rinetd/etc/rinetd.conf

#############################################

192.168.1.103 6033  192.168.1.107 3306

allow 192.168.1.*

logfile /usr/local/rinetd/log/rinetd.log

#############################################

# systemctl  restart  rinetd.service

# systemctl  status  rinetd.service

# echo  >  /dev/tcp/192.168.1.103/6033

# echo  >  /dev/tcp/192.168.1.107/3306

# tail  /usr/local/rinetd/log/rinetd.log

七、参考

Linux下使用 Rinetd 来实现端口转发

https://www.hi-linux.com/posts/29683.html

RINETD(8) Unix System Manager’s Manual

https://www.boutell.com/rinetd

生产环境中谨慎使用rinetd

https://blog.csdn.net/woshiaotian/article/details/78133195

Linux安装rinetd实现TCP端口转发

https://www.xiaoz.me/archives/10175

rinetd-0.62-9.el7.nux.x86_64.rpm

https://centos.pkgs.org/7/nux-misc-x86_64/rinetd-0.62-9.el7.nux.x86_64.rpm.html

Port-Forwarding With rinetd

https://www.howtoforge.com/port-forwarding-with-rinetd-on-debian-etch

Comprehensive Guide to Port Redirection using Rinetd

https://www.hackingarticles.in/comprehensive-guide-to-port-redirection-using-rinetd

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