iOS Networking

1
iOS Networking

• CS328

2
Big Picture
3
Core Foundation Networking

• CF Networking APIs are abstractions on top of the
  BSD sockets to make it easier to program network
  protocols.
• working with BSD sockets
• Creating and using SSL and TLS
• Resolving DNS host requests
• Working with HTTP
• Working with FTP
• Publishing , resolving and browsing Bonjour
  services

4
CF Network Concepts

• Low level, high performance framework to give
  detailed control over the protocol stack
• An extension of BSD sockets

5
CFSocket and CFStream

• CFSocket and CFStream are fundamental to
  CFNetwork
• First well look at both before looking at
  CFNetwork

6
CFSocket

• Most basic level of network communication
• Uses BSD Socket but the abstraction allows the
  CFSocket to be integrated with a program
  run-loop.
• Can also be used for UDP sockets.

7
CFSocket

• CFSocketCreate makes a CFSocket from scratch
• CFSocketCreateWithNative Create a CFSocket out
  of a BSD socket
• CFSocketCreateRunLoopSource Create a CFSocket
  to use in a program run loop.
• CFSocket Reference

8
CFStream

• Provides the abstraction to read and write
  information from one socket on the local machine
  and another on a remote machine (could also be on
  the local machine).
• Streams can be attached to memory, files or
  sockets/network
• CFReadStream
• CFWriteStream

9
The Framework
10
Using

• Use in the same way as a UNIX stream
• Create the stream (instantiate it)
• Open it
• Read or write it.
• Close/Dispose of
• CFStream Reference

11
Other CFNetwork APIs

• CFFTP create read/write streams for uploading
  and downloading files from FTP servers. This
  implements the FTP protocol
• CFHTTP - create read/write streams for sending
  HTTP Requests and receiving HTTP Response
  packets. This implements the HTTP protocol

12

• CFHTTPAuthentication provides for interfacing
  with an HTTP server set up for challenge/response
  authentication.
• CFHost Lets you query host information from
  DNS.
• CFNetServices Interface to Bonjour.

13
Bonjour

• Bonjour is Apple Inc.'s trade name for its
  implementation of Zeroconf, a group of
  technologies that includes service discovery,
  address assignment, and name resolution. Bonjour
  locates devices such as printers, other
  computers, and the services that those devices
  offer on a local network using multicast Domain
  Name System (mDNS) service records.

14
Zeroconf

• Zero configuration networking (zeroconf), is a
  set of techniques that automatically creates a
  usable Internet Protocol (IP) network without
  manual operator intervention or special
  configuration servers.