simpletun, a (too) simple tunnelling program. To compile the program, just do $ gcc simpletun.c -o simpletun If you have GNU make, you can also exploit implicit targets and do $ make simpletun Usage: simpletun -i <ifacename> [-s|-c <serverIP>] [-p <port>] [-u|-a] [-d] simpletun -h -i <ifacename>: Name of interface to use (mandatory) -s|-c <serverIP>: run in server mode (-s), or specify server address (-c <serverIP>) (mandatory) -p <port>: port to listen on (if run in server mode) or to connect to (in client mode), default 55555 -u|-a: use TUN (-u, default) or TAP (-a) -d: outputs debug information while running -h: prints this help text Refer to http://backreference.org/2010/03/27/tuntap-interface-tutorial/ for more information on tun/tap interfaces in Linux in general, and on this program in particular. The program must be run at one end as a server, and as client at the other end. The tun/tap interface must already exist, be up and configured with an IP address, and owned by the user who runs simpletun. That user must also have read/write permission on /dev/net/tun. (Alternatively, you can run the program as root, and configure the transient interfaces manually before starting to exchange packets. This is not recommended) Use is straightforward. On one end just run [server]$ ./simpletun -i tun13 -s at the other end run [client]$ ./simpletun -i tun0 -c 10.2.3.4 where 10.2.3.4 is the remote server's IP address, and tun13 and tun0 must be replaced with the names of the actual tun interfaces used on the computers. By default it assumes a tun device is being used (use -u to be explicit), and -a can be used to tell the program that the interface is tap. By default it uses TCP port 55555, but you can change that by using -p (the value you use must match on the client and the server, of course). Use -d to add some debug information. Press ctrl-c on either side to exit (the other end will exit too). The program is very limited, so expect to be disappointed.
from https://github.com/gregnietsky/simpletun
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在linux vps上，安装没问题。
在mac上，不行：
yudeMacBook-Air:simpletun brite$ ls
AUTHORS LICENSE README
Changelog Makefile simpletun.c
yudeMacBook-Air:simpletun brite$ gcc simpletun.c -o simpletun
simpletun.c:28:10: fatal error: 'linux/if_tun.h' file not found
#include <linux/if_tun.h>
^
1 error generated.
yudeMacBook-Air:simpletun brite$
看到上面的蓝色文字了吗？说明只能在linux系统（比如linux桌面系统）上安装！
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Simpletun
This is a
simple tunnelling program written to test tunnelling of IPv4 and IPv6
over IPv4. It can use TCP or UDP as underlying protocol over which
tunnelling happens.
This is a simple tunnelling program written to test tunnelling of
IPv4 and IPv6 over IPv4 or IPv6. It can use TCP or UDP as underlying
protocol over which tunnelling happens.
It can also create a persistent tun device and set its owner.The program uses multithreading (pthread) to read and write between two devices (tun and network). Although the code is written by me, I have referred to and am influenced by article and code snippets on http://backreference.org/2010/03/26/tuntap-interface-tutorial/
from https://github.com/aoak/Simpletun
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Virtual Private Network (VPN) Lab
Overview
A Virtual Private Network (VPN) is used for creating a private scope of computer communications or providing a secure extension of a private network into an insecure network such as the Internet. VPN is a widely used security technology. VPN can be built upon IPSec or Secure Socket Layer (SSL). These are two fundamentally different approaches for building VPNs. In this lab, we focus on the SSL-based VPNs. This type of VPNs is often referred to as SSL VPNs. The learning objective of this lab is for students to master the network and security technologies underlying SSL VPNs. The design and implementation of SSL VPNs exemplify a number of security principles and technologies, including crypto, integrity, authentication, key management, key exchange, and Public-Key Infrastructure (PKI). To achieve this goal, students will implement miniVPN, a simple SSL VPN, in the Linux operating system.Lab Description and Tasks (PDF)
-
For instructors: if you prefer to modify the lab description
to suit your own courses, you can download the source files (Latex)
from here.
Recommended Time: 4 weeks
Files You Need
Helpful Documents
- TA's presentation slides used in lab session
- If you use VirtualBox, you can following the instruction in this document to set up the virtual networks in your environment.
- Tun/tap interface tutorial
- A simple UDP client/server program.
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https://blog.cobaltstrike.com/2014/10/14/how-vpn-pivoting-works-with-source-code/
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