Sockets, IPv4, and Simple Client/Server Programming

In this chapter, we will cover the following recipes:

• Printing your machine's name and IPv4 address
• Retrieving a remote machine's IP address
• Converting an IPv4 address to different formats
• Finding a service name, given the port and protocol
• Converting integers to and from host to network byte order
• Setting and getting the default socket timeout
• Handling socket errors gracefully
• Modifying a socket's send/receive buffer size
• Changing a socket to the blocking/non-blocking mode
• Reusing socket addresses
• Printing the current time from the internet time server
• Writing an SNTP client
• Writing a simple TCP echo client/server application
• Writing a simple UDP echo client/server application