SNT - Simple Network Tool

snt - simple-network-tool is a network tool for performing network performance tests. The program supports multiple benchmark modes for testing various aspect of the network. The benchmark can use compression and encryption optionally in order to check how encryption and compression will change the network performance.

The snt program uses the server/client connection model. Where the server and client is executed on the same executable binary.

Benchmark modes

• Performance - Send as much data as possible by specified payload size.
• Integrity - Sends a number sequence or time stamp to compare the arrival in order to check if they arrived in a consecutive order or not.
• File-Transfer - Send a file, used for repeatable benchmark testing when using encryption and compression.

Motivation

This project was created for educational purposes. It was created in order learn about creating a secure connection with asymmetric and symmetric ciphers.

Installation

The program is installed with the following commands.

mkdir build
cd build
cmake ..
make

Wireshark

The wireshark dissector for decoding snt packets with the wireshark program can be installed with the following command:

make install_wireshark

This will install a lua script in the $(USER)/.wireshark directory.

Service

The service script can be installed to run the snt program as a deamon service. This can be done with the following command:

make insall_service 

make install_systemd_service

The service can be started as followed:

service sntd start

Certificates

The snt program support loading certificate and PEM files at startup. The snt default settings is to load a certifcate and a PEM file from the filesystem. The following command will generate the certificate, private key and diffie hellman parameter. This may take a long time because diffie hellman is set to 2048 bit. This can overriden by appending the argument DHPARAM=1024, this would change the diffie hellman from its default 2048 bit to 1024 bit.

make cert
make install_cert

Examples

This section cover some examples of how to use the snt program. See snt(1) for what command line options are available for usage.

Client

Running in client mode requires at least the -h option with the hostname or IP address argument of the server that it shall connect to. The snt program is by default set to run as a client.

snt -h localhost --secure --compression -b performance --verbose

Using the file benchmark mode.

snt -h localhost --secure --compression -b file --file='valid path' --verbose

Specifying a compression algorithm. Valid options are: lz4, gzip, and bzip2.

snt -h localhost --secure --compression=lz4

Specifying a symmetric cipher algorithm. Valid options are: aesecb128, aesecb192, aesecb256, blowfish, des, 3des, aescbc128, aescbc192, aescbc256, aescfb128, aescfb192, aescfb256, aesofb128, aesofb192, aesofb256, 3descbc, bfcbc, bfcfb, rc4, cast, castcbc and castcfb.

snt -h localhost --secure --cipher=aescbc128

Server

The server mode requires at least that the --server option is specified in order for the snt program to run in server mode.

snt --server --secure --compression=all --verbose

Set the affinity mapping that has the following format: CPU, core index, number of adjacent cores.

snt --server affinity=0,1,2

Contributing

Please read the CONTRIBUTING.md for more details of how you can contriubute.

Dependencies

In order to compile the program, the following Debian packages is required.

apt-get install libzip-dev liblz4-dev libssl1.0-dev libbz2-dev

In order to use the system v service, the following Debian package is required.

apt-get install daemon

License

This project is licensed under the GPL+3 License - see the LICENSE file for details.