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Table Of Contents

iOS and OS X Network Programming Cookbook

By : Jon Hoffman

4.5 (6)

iOS and OS X Network Programming Cookbook

4.5 (6)

By: Jon Hoffman

Overview of this book

iOS and OS X Network Programming Cookbook

iOS and OS X Network Programming Cookbook

Credits

Credits

About the Author

About the Author

About the Reviewers

About the Reviewers

www.PacktPub.com

www.PacktPub.com

Preface

Preface

Free Chapter

BSD Socket Library

BSD Socket Library

Introduction

Finding the byte order of your device

Retrieving network address information

Performing a network address resolution

Creating an echo server

Creating an echo client

Creating a data server

Creating a data client

Apple Low-level Networking

Apple Low-level Networking

Introduction

Retrieving network address information

Performing a network address resolution

Creating an echo server

Creating an echo client

Creating a server to receive data

Creating a client to send data

Checking the network status

Using Libnet

Using Libnet

Introduction

Installing libnet

Adding libnet to your project

Resolving names to addresses with libnet

Retrieving local addresses with libnet

Constructing a Ping packet with libnet

Constructing a UDP packet with libnet

Constructing a TCP packet with libnet

Using Libpcap

Using Libpcap

Introduction

Adding libpcap to your project

Retrieving network device information

Capturing packets

Decoding Ethernet headers

Decoding IP headers

Decoding ARP headers

Decoding TCP headers

Decoding UDP headers

Decoding ICMP headers

Filtering packets

Saving a capture file

Creating a simple port scanner using libnet and libpcap together

Apple High-level Networking

Apple High-level Networking

Introduction

Performing HTTP(S) synchronous GET requests

Performing HTTP(S) synchronous POST requests

Performing HTTP(S) asynchronous GET requests

Performing HTTP(S) asynchronous POST requests

Parsing an RSS feed with NSXMLParser, NSURL, and NSData

Creating a peer-to-peer bluetooth network

Bonjour

Bonjour

Introduction

Publishing a Bonjour service

Discovering a Bonjour service

Resolving a Bonjour service

Creating an echo server that uses Bonjour to advertise the service

Creating an echo client that uses Bonjour to discover the service

AFNetworking 2.0 Library

AFNetworking 2.0 Library

Introduction

Checking the network connection type and changes

Creating a web client using AFHTTPSessionManager

Creating a custom response serializer

Using the UIImageView+AFNetworking category

Downloading files with a progress bar

MKNetworkKit

MKNetworkKit

Introduction

Creating and using the MKNetworkKit engine

Uploading a file using MKNetworkKit

Downloading a file using MKNetworkKit

Using the UIImageView+MKNetworkKitAdditions.h category and caching the images

Adding a progress bar to upload or download

Index

Index

Decoding UDP headers

In the Decoding IP headers recipe of this chapter, we created a decodeIp() function that decoded the IP headers of a packet. If the protocol type was UDP in that function, we called a decodeUdp() function. We will create the decodeUdp() function in this recipe.

The UDP header is a part of the third layer (Protocol layer) of our header stack. This is what the UDP header looks like:

Let's take a look at the fields of the UDP header:

Source Port: This field identifies the port used by the sender, and it can be assumed that any reply should be sent to this port. If no reply is needed or wanted, we should set this port to 0, indicating that we are not expecting a reply.
Destination Port: This field identifies the port on the client to which the datagram has to be sent. The port should be a valid port number between 0 and 65535.
Length: This field indicates the size of the UDP header and the payload.
Checksum: This field indicates the checksum for the UDP header.

If you recall from...

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