Hands-On Network Programming with C - Learn socket programming in C and write secure and optimized network code (true pdf)

Cover
Title Page
Copyright and Credits
Dedication
About Packt
Contributors
Table of Contents
Preface
Section 1 - Getting Started with Network Programming
Chapter 1: Introducing Networks and Protocols
	Technical requirements
	The internet and C
	OSI layer model
	TCP/IP layer model
	Data encapsulation
	Internet Protocol
		What is an address?
	Domain names
	Internet routing
		Local networks and address translation
		Subnetting and CIDR
		Multicast, broadcast, and anycast
	Port numbers
	Clients and servers
	Putting it together
	What's your address?
	Listing network adapters from C
		Listing network adapters on Windows
		Listing network adapters on Linux and macOS
	Summary
	Questions
Chapter 2: Getting to Grips with Socket APIs
	Technical requirements
	What are sockets?
	Socket setup
	Two types of sockets
	Socket functions
	Anatomy of a socket program
		TCP program flow
		UDP program flow
	Berkeley sockets versus Winsock sockets
		Header files
		Socket data type
		Invalid sockets
		Closing sockets
		Error handling
	Our first program
		A motivating example
		Making it networked
		Working with IPv6
		Supporting both IPv4 and IPv6
		Networking with inetd
	Summary
	Questions
Chapter 3: An In-Depth Overview of TCP Connections
	Technical requirements
	Multiplexing TCP connections
		Polling non-blocking sockets
		Forking and multithreading
		The select() function
	Synchronous multiplexing with select()
		select() timeout
		Iterating through an fd_set
		select() on non-sockets
	A TCP client
		TCP client code
	A TCP server
		TCP server code
		Building a chat room
	Blocking on send()
	TCP is a stream protocol
	Summary
	Questions
Chapter 4: Establishing UDP Connections
	Technical requirements
	How UDP sockets differ
		UDP client methods
		UDP server methods
	A first UDP client/server
		A simple UDP server
		A simple UDP client
	A UDP server
	Summary
	Questions
Chapter 5: Hostname Resolution and DNS
	Technical requirements
	How hostname resolution works
		DNS record types
		DNS security
	Name/address translation functions
		Using getaddrinfo()
		Using getnameinfo()
		Alternative functions
		IP lookup example program
	The DNS protocol
		DNS message format
		DNS message header format
		Question format
		Answer format
		Endianness
		A simple DNS query
	A DNS query program
		Printing a DNS message name
		Printing a DNS message
		Sending the query
	Summary
	Questions
	Further reading
Section 2 - An Overview of Application Layer Protocols
Chapter 6: Building a Simple Web Client
	Technical requirements
	The HTTP protocol
		HTTP request types
		HTTP request format
		HTTP response format
		HTTP response codes
		Response body length
	What's in a URL
		Parsing a URL
	Implementing a web client
	HTTP POST requests
		Encoding form data
		File uploads
	Summary
	Questions
	Further reading
Chapter 7: Building a Simple Web Server
	Technical requirements
	The HTTP server
		The server architecture
	Content types
		Returning Content-Type from a filename
	Creating the server socket
	Multiple connections buffering
		get_client()
		drop_client()
		get_client_address()
		wait_on_clients()
		send_400()
		send_404()
		serve_resource()
	The main loop
	Security and robustness
		Open source servers
	Summary
	Questions
	Further reading
Chapter 8: Making Your Program Send Email
	Technical requirements
	Email servers
		SMTP security
		Finding an email server
	SMTP dialog
	The format of an email
	A simple SMTP client program
	Enhanced emails
		Email file attachments
	Spam-blocking pitfalls
	Summary
	Questions
	Further reading
Section 3 - Understanding Encrypted Protocols and OpenSSL
Chapter 9: Loading Secure Web Pages with HTTPS and OpenSSL
	Technical requirements
	HTTPS overview
	Encryption basics
		Symmetric ciphers
		Asymmetric ciphers
		How TLS uses ciphers
	The TLS protocol
		Certificates
		Server name identification
	OpenSSL
		Encrypted sockets with OpenSSL
		Certificates
	A simple HTTPS client
	Other examples
	Summary
	Questions
	Further reading
Chapter 10: Implementing a Secure Web Server
	Technical requirements
	HTTPS and OpenSSL summary
		Certificates
		Self-signed certificates with OpenSSL
	HTTPS server with OpenSSL
		Time server example
		A full HTTPS server
	HTTPS server challenges
		OpenSSL alternatives
		Alternatives to TLS
	Summary
	Questions
	Further reading
Chapter 11: Establishing SSH Connections with libssh
	Technical requirements
	The SSH protocol
	libssh
		Testing out libssh
		Establishing a connection
	SSH authentication
		Server authentication
		Client authentication
	Executing a remote command
	Downloading a file
	Summary
	Questions
	Further reading
Section 4 - Odds and Ends
Chapter 12: Network Monitoring and Security
	Technical requirements
	The purpose of network monitoring
	Testing reachability
		Checking a route
		How traceroute works
		Raw sockets
	Checking local connections
	Snooping on connections
		Deep packet inspection
		Capturing all network traffic
	Network security
		Application security and safety
	Network-testing etiquette
	Summary
	Questions
	Further reading
Chapter 13: Socket Programming Tips and Pitfalls
	Technical requirements
	Error handling
		Obtaining error descriptions
	TCP socket tips
		Timeout on connect()
		TCP flow control and avoiding deadlock
		Congestion control
		The Nagle algorithm
		Delayed acknowledgment
		Connection tear-down
		The shutdown() function
		Preventing address-in-use errors
		Sending to a disconnected peer
	Socket's local address
	Multiplexing with a large number of sockets
	Summary
	Questions
Chapter 14: Web Programming for the Internet of Things
	Technical requirements
	What is the IoT?
	Connectivity options
		Wi-Fi
		Ethernet
		Cellular
		Bluetooth
		IEEE 802.15.4 WPANs
	Hardware choices
		Single-board computers
		Microcontrollers
		FPGAs
	External transceivers and modems
	IoT protocols
	Firmware updates
	Ethics of IoT
		Privacy and data collection
		End-of-life planning
		Security
	Summary
	Questions
Appendix A: Answers to Questions
	Chapter 1, Introducing Networks and Protocols
	Chapter 2, Getting to Grips with Socket APIs
	Chapter 3, An In-Depth Overview of TCP Connections
	Chapter 4, Establishing UDP Connections
	Chapter 5, Hostname Resolution and DNS
	Chapter 6, Building a Simple Web Client
	Chapter 7, Building a Simple Web Server
	Chapter 8, Making Your Program Send Email
	Chapter 9, Loading Secure Web Pages with HTTPS and OpenSSL
	Chapter 10, Implementing a Secure Web Server
	Chapter 11, Establishing SSH Connections with libssh
	Chapter 12, Network Monitoring and Security
	Chapter 13, Socket Programming Tips and Pitfalls
	Chapter 14, Web Programming for the Internet of Things
Appendix B: Setting Up Your C Compiler on Windows
	Installing MinGW GCC
	Installing Git
	Installing OpenSSL
	Installing libssh
	Alternatives
Appendix C: Setting Up Your C Compiler on Linux
	Installing GCC
	Installing Git
	Installing OpenSSL
	Installing libssh
Appendix D: Setting Up Your C Compiler on macOS
	Installing Homebrew and the C compiler
	Installing OpenSSL
	Installing libssh
Appendix E: Example Programs
	Code license
	Code included with this book
		Chapter 1 – Introducing Networks and Protocols
		Chapter 2 – Getting to Grips with Socket APIs
		Chapter 3 – An In-Depth Overview of TCP Connections
		Chapter 4 – Establishing UDP Connections
		Chapter 5 – Hostname Resolution and DNS
		Chapter 6 – Building a Simple Web Client
		Chapter 7 – Building a Simple Web Server
		Chapter 8 – Making Your Program Send Email
		Chapter 9 – Loading Secure Web Pages with HTTPS and OpenSSL
		Chapter 10 – Implementing a Secure Web Server
		Chapter 11 – Establishing SSH Connections with libssh
		Chapter 12 – Network Monitoring and Security
		Chapter 13 – Socket Programming Tips and Pitfalls
		Chapter 14 – Web Programming for the Internet of Things
Other Book You May Enjoy
Index