In this example, we’ll use a Raspberry Pi and a DHT22 temperature and humidity sensor to print values on a web interface.
Continue reading Web interface for Raspberry’s sensors (GPIO)
Category: Linux
Anonymize TCP traffic on Debian with Tor
Tor is free software for enabling anonymous communication.Tor directs Internet traffic through a free, worldwide, volunteer network consisting of more than seven thousand relays to conceal a user’s location and usage from anyone conducting network surveillance or traffic analysis.
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Flightradar24 : Behind the scene – Receiver setup
The technology used by Flightradar24 is based on ADS-B technology.
Automatic Dependent Surveillance – Broadcast (ADS–B) is a cooperative surveillance technology in which an aircraft determines its position via satellite navigation and periodically 
broadcasts it, enabling it to be tracked. The information can be received by air traffic control ground stations as a replacement for secondary radar. It can also be received by other aircraft to provide situational awareness and allow self separation.
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Cross compilation of a Kernel module on Ubuntu for Raspbian
The D-Link DWA-131 WiFi dongle is not supported out of the box on Raspbian, a compilation is required.
You have two options : Compile on the Pi or cross-compile on a other machine. I prefer to cross-compile as it’s faster and easier : you avoid to install the compilation tools and download huge sources on a small SD card…
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C7824WIP Security Review
1. Camera specifications
– Brand : Vstarcam
– Product name : C7824WIP HD indoor IP Camera
– Model : C7824WIP
– OS : Embedded Linux OS
– CPU :
> cat /proc/cpuinfo Processor : ARM926EJ-S rev 5 (v5l) BogoMIPS : 217.08 Features : swp half thumb fastmult edsp java CPU implementer : 0x41 CPU architecture: 5TEJ CPU variant : 0x0 CPU part : 0x926 CPU revision : 5 Hardware : hi3518 Revision : 0000 Serial : 0000000000000000
2. Security vulnerabilities
Achievements :
– Remotely take control of the camera (telnet)
– Find the web UI password
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Zabbix – Monitor a device behind a NAT / firewall
There is two modes for Zabbix checks:
– Passive check : a simple data request. Zabbix server or proxy asks for some data (for example, CPU load) and Zabbix agent sends back the result to the server.
– Active check : the agent must first retrieve from the server(s) a list of items for independent processing. Then the agent then periodically sends the new values to the server(s).
Monitoring a Zabbix agent behind a firewall or a NAT without any port redirection requires to use the active mode.
It’s not recommended to monitor over internet without using a VPN.
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FreeBSD 10.1 – Zabbix 2.4 monitoring system
Zabbix is an enterprise open source monitoring solution for networks and applications.
The Zabbix monitoring system is divided in 3 sub-systems :
– Zabbix server : Collect and store data from the devices.
– Zabbix frontend : Render the data and manage the web UI.
– Zabbix agent : Run locally on the different devices to be monitored.
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Raspberry – Direct network connection and internet sharing
Just installed Raspbian on my Pi but I have no router, no screen and no keyboard : Just a laptop connected to a WiFi network and one network cable.
We can use ICS (Internet Connection Sharing) to connect our Pi to our Laptop. We’ll be able to use SSH and the raspberry Pi will have an internet access.
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