This SNTP client creates a socket connection and sends the protocol data. After receiving the response from the NTP server (in this case, 0.uk.pool.ntp.org), it unpacks the data with struct. Finally, it subtracts the reference time, which is January 1, 1970, and prints the time using the ctime() built-in method in the Python time module.
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by Dr. M. O. Faruque Sarker, Pradeeban Kathiravelu
Python Network Programming Cookbook - Second Edition
- Preface
- Sockets, IPv4, and Simple Client/Server Programming
- Introduction
- 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 sizes
- 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
- Multiplexing Socket I/O for Better Performance
- IPv6, Unix Domain Sockets, and Network Interfaces
- Introduction
- Forwarding a local port to a remote host
- Pinging hosts on the network with ICMP
- Waiting for a remote network service
- Enumerating interfaces on your machine
- Finding the IP address for a specific interface on your machine
- Finding whether an interface is up on your machine
- Detecting inactive machines on your network
- Performing a basic IPC using connected sockets (socketpair)
- Performing IPC using Unix domain sockets
- Finding out if your Python supports IPv6 sockets
- Extracting an IPv6 prefix from an IPv6 address
- Writing an IPv6 echo client/server
- Programming with HTTP for the Internet
- Introduction
- Downloading data from an HTTP server
- Serving HTTP requests from your machine
- Extracting cookie information after visiting a website
- Submitting web forms
- Sending web requests through a proxy server
- Checking whether a web page exists with the HEAD request
- Spoofing Mozilla Firefox in your client code
- Saving bandwidth in web requests with the HTTP compression
- Writing an HTTP fail-over client with resume and partial downloading
- Writing a simple HTTPS server code with Python and OpenSSL
- Building asynchronous network applications with Twisted
- Building asynchronous network applications with Tornado
- Building concurrent applications with Tornado Future
- Email Protocols, FTP, and CGI Programming
- Introduction
- Listing the files in a remote FTP server
- Uploading a local file to a remote FTP server
- Emailing your current working directory as a compressed ZIP file
- Downloading your Google email with POP3
- Checking your remote email with IMAP
- Sending an email with an attachment via Gmail SMTP server
- Writing a guestbook for your (Python-based) web server with CGI
- Finding the mail server from an email address
- Writing a simple SMTP server
- Writing a secure SMTP client using TLS
- Writing an email client with POP3
- Programming Across Machine Boundaries
- Introduction
- Executing a remote shell command using telnet
- Copying a file to a remote machine by SFTP
- Printing a remote machine's CPU information
- Installing a Python package remotely
- Running a MySQL command remotely
- Transferring files to a remote machine over SSH
- Configuring Apache remotely to host a website
- Working with Web Services – XML-RPC, SOAP, and REST
- Introduction
- Querying a local XML-RPC server
- Writing a multithreaded, multicall XML-RPC server
- Running an XML-RPC server with a basic HTTP authentication
- Collecting some photo information from Flickr using REST
- Searching for SOAP methods from an Amazon S3 web service
- Searching Amazon for books through the product search API
- Creating RESTful web applications with Flask
- Network Monitoring and Security
- Introduction
- Sniffing packets on your network
- Saving packets in the pcap format using the pcap dumper
- Adding an extra header in HTTP packets
- Scanning the ports of a remote host
- Customizing the IP address of a packet
- Replaying traffic by reading from a saved pcap file
- Scanning the broadcast of packets
- Network Modeling
- Getting Started with SDN
- Introduction
- SDN emulation with Mininet
- Developing Software-Defined Networks with OpenDaylight controller
- Developing Software-Defined Networks with ONOS controller
- Developing Software-Defined Networks with Floodlight controller
- Developing Software-Defined Networks with Ryu controller
- Developing Software-Defined Networks with POX controller
- Developing Software-Defined Networks visually with MiniEdit
- Authentication, Authorization, and Accounting (AAA)
- Open and Proprietary Networking Solutions
- NFV and Orchestration – A Larger Ecosystem
- Programming the Internet
How it works...
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