The project consists of a file backup system developed using C++ in a UNIX environment. The system utilizes RawSockets for communication between a Client and a Server, requiring an Ethernet cable connection between the machines. Another option for testing is to use the computer's loopback interface if only one machine is available.
All messages sent and received by both machines are instances of the class Message. For sending, the Controller is responsible for receiving all the information from the message and copying it to the sending buffer. On the other hand, during reception, the channel data will be assigned to an object of the class Message. For reading and writing, all files are treated as binary files. The messages attributes are:
| Attribute | Value |
|---|---|
| Ethernet Header | 14 bytes |
| Init Markerk | 01111110 |
| Data Size | 6 bits |
| Sequence | 6 bits |
| Type | 4 bits |
| Data | 0 a 63 bytes |
| Parity (Data) | 1 byte |
The communication uses the "Stop and Wait" protocol, in which the sender sends a data packet and waits for the receiver's confirmation before sending the next packet. This ensures the integrity of the transmission by allowing the retransmission of lost or corrupted packets.
To compile the project, run the following command in the root directory:
makeIf you want to compile the project with debug information, use:
make debugTo run the Server and the Client you need to run the following commands in the root directory with sudo option:
./server./clientIn both client.cpp and server.cpp the interface is set to eno1. You must change it to the interface you are using. To check the available interfaces, run the following command:
ifconfigIf you want to use the loopback interface, change the interface to lo.
To verify the backup, the system provides the MD5 option to check the integrity of the files. Other options are available, such as the diff command, which compares the files byte by byte.