Previously I played with squid proxy server, today I wanted to try with some alternatives and selected tinyproxy. This proxy also supports HTTP/HTTPS, it is light weight proxy. HTTP/HTTPS. The key features of tinyproxy include: Anonymous mode, Access control, Small footprint, Proxy chaining, remote monitoring and others. The tinyproxy is configurable by editing /etc/tinyproxy/tinyproxy.conf file… Read More »
.Net core is actually very cool brainchild of Microsoft. It tries give you possibility to publish the same code to the multiple OS platforms. The result sometime looks cumbersome but probably it does not matter so far, if you want to migrate Windows code to Linux, Mac OSX and Android fast. Definitely it is not… Read More »
Raspbian OS for Raspberry PI is Linux based operating system derived from Debian. So it could be easily to create Raspbian virtual machine on Oracle VirtualBox. The initial experience with Oracle VirtualBox is required. And you need to install it first. The second you need to download IOS image of Raspbian OS. I downloaded Raspbian… Read More »
SNMP v3 is the version of Simple Network Management Protocol with advance security mechanism to handle SNMP packets. The net-snmp agent is free snmp v3 agent. The version 3 of Simple Network Management Protocol provides more secure authentication and cryptographic features. The snmpv3 defined in RFCs 3413 and 3414. The steps presented below related to… Read More »
The sysinfo system call returns a lot of useful system statistic data: memory usage, number of currently running processes, seconds since last boot. The only argument used by sysinfo is a pointer to a sysinfo structure. The first member of sysinfo structure is uptime which contains number of seconds since last reboot. For more details… Read More »
Recently it was needed to convert UTC time string to local computer time string in C++ code. After analyzing several examples from stackoverflow and other resources I implemented this one. It is short application free from explicitely specified time zone. It is not extremely sophisticated at all. I am keeping it here mainly for my… Read More »
EOVERFLOW (Value too large for defined data type) error or error with code 75 is defined in errno.h file. The error is very common on 32-bit Linux OS when code tries to proceed with size 2 GB or more. It is very simple to simulate the error. Let us create file with size which exceeds… Read More »
To diagnose program crashing failure let us create our own simple c++ application which will be crashing during execution. Save it as exemplo.cpp. Build executable without debug information: g++ -o exemplo exemplo.cpp When we start it we receive information that application crashed because of segmentation fault: ./exemplo Crashing application Segmentation fault (core dumped) The simplest… Read More »
This is the example how to organize remote monitoring of processes running on Linux devices. Let us create simple script which executes ps command, saves results in html file and uploads the file in http server. 2 arguments are required to run the script: the fist one is html file name without extension and the… Read More »
I decided to test how proxy server anonymity looks like and how to control it. The purpose was to get HTTP request header which server receives from proxy when proxy settings are anonymous, semi-anonymous or what ever. I installed squid proxy server on one Linux machine and started to play with its settings located in… Read More »