CS 330: Lab - Notes

• Upgrade VM
• Setup Environment
• Install Wireshark
• Install Python
• File Commands and Directory Navigation
• Networking
• Socket

Upgrade VM

• sudo apt update - downloads package information from all configured sources.
• sudo apt upgrade - will upgrade all installed packages to their latest versions.
• sudo apt-get autoremove - deletes orphaned packages, or dependencies that remain installed after you have installed an application and then deleted it.
• sudo apt-get clean - removes all packages from the cache.

Setup Environment

• GNU Development Tools Packages: sudo apt install build-essential gcc make perl dkms
• Install netcat: sudo apt-get install netcat
• Install networking tools: sudo apt install net-tools
• Visual Studio Code: sudo snap install --classic code
  • Sublime: sudo snap install sublime-text --classic
  • clion: sudo snap install clion --classic
• Test Setup:
  • List Network Adapters: list-network-adapters.c
    • Compile with gcc list-network-adapters.c -o list-network-adapters
    • Run with ./list-network-adapters

Install Wireshark

• sudo apt-get install wireshark
• sudo dpkg-reconfigure wireshark-common
• sudo adduser $USER wireshark
• sudo chmod +x /usr/bin/dumpcap

Install Python

• sudo apt-get install python3
  • Run a webserver: python3 -m http.server 8000

File Commands and Directory Navigation

• cd go to $HOME directory.
• cd ... go one level up the directory tree.
• cd /etc to change to the /etc directory.
• ls list all files.
  • Use -R to list all-subdirectories as well
  • -a will list hidden files as well
  • Use the -al argument to view details
• pwd lists the present working directory.
• mkdir directory created a directory.
• rm -r directory removes the directory and its contents recursively. Use the f argument to forcefully remove, re: rm -rf directory.
• touch file will create an empty file.
• rm file removes a flle.
• cp file file2 will copy file to file2.
• mv file file2 renames or moves file to file2.
• cat filename will display the contests of filename.
• cat > filename creates a new file with filename.

Networking

• ifconfig -a displays all network interfaces and IP address.
• hostname -I displays the IP addresses of the host (all local IP addresses).
• host domain displays IP address for domain.
• ping host sends ICMP echo request to host.
• whois domain displays whois records for domain.
• dig domain displays DNS information for domain.
• dig -x IP does reverse lookup of IP address.
• nslookup query Internet name servers interactively.
• To display the IP/kernel routing table:
  • netstat -rn
  • ip route
  • route -n

Socket

• tcp_server.c
  • Why 14 on line 61?
  • Display Client Data?
  • Create a new server or update to handle HTTP requests.