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Leopard Reference Library: Networking
Darwin is the open source UNIX-based foundation of Mac OS X. Darwin networking includes various low-level networking facilities such as zero-configuration networking (Bonjour), BSD sockets, and network kernel extensions.

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Network Kernel Extensions Programming Guide (HTML) (PDF)
Describes how to write a kernel extension for adding or modifying functionality of a networking stack (Mac OS X 10.4 and later).
Guides 2009-03-02
Getting a Packet Trace (HTML) (日本語 HTML)
QA1176: Lists tools available for looking at the network packets on the wire.
Technical Q&As 2008-06-03
Darwin Notification API Reference (HTML)
Describes the Darwin API for interprocess notification.
Reference 2008-04-08
System Configuration Framework Reference (HTML)
Describes the API for configuration of network resources, the reachability of target hosts, and connection to network services.
Reference 2008-04-08
Bonjour Printer Subtype for HTTP (HTML)
QA1555: Describes how printer vendors can register their bonjour service such that Safari can see them.
Technical Q&As 2008-03-25
CFProxySupportTool (HTML) (DMG) (ZIP)
Shows how to use the CFProxySupport APIs to decide whether a network connection should pass through a proxy.
Sample Code 2007-10-29
Descriptor Passing Problems (HTML)
QA1541: Describes how to work around common problems with descriptor passing.
Technical Q&As 2007-10-29
System Configuration Reference Update (HTML) (PDF)
Summarizes the symbols added to the System Configuration framework.
Release Notes 2007-07-18
CCL Modem Scripting Guide (HTML) (PDF)
Guides 2007-06-28
MoreSCF (HTML) (DMG) (ZIP)
High-level wrapper around System Configuration framework, making common operations easy.
Sample Code 2007-06-07
Open Directory Programming Guide (HTML) (PDF)
Explains how to implement centralized storage and retrieval of information in Carbon.
Guides 2007-01-08
Network Kernel Extensions (legacy) (HTML) (PDF)
Describes how to write a kernel extension for adding or modifying functionality of a networking stack (Mac OS X 10.3 and earlier).
Guides 2006-10-03
The state of mDNSResponder (HTML)
QA1339: Explains how to obtain information regarding the internal state of mDNSResponder.
Technical Q&As 2006-10-03
KPI Reference (HTML)
Provides information on the NKE Sustainable API in Headerdoc format.
Reference 2006-07-17
Apple Filing Protocol Reference (HTML) (PDF)
Describes the Apple Filing Protocol commands.
Reference 2006-05-23
Open Directory Plug-in Programming Guide (HTML) (PDF)
Explains how to implement dynamically loaded libraries that respond to Open Directory client requests in Carbon.
Guides 2006-05-23
Open Directory Reference (HTML) (PDF)
Describes the Carbon API for using Open Directory.
Reference 2006-05-23
Apple Filing Protocol Programming Guide (HTML) (PDF)
Describes high-level concepts for Apple Filing Protocol commands.
Guides 2006-04-04
System Configuration Programming Guidelines (HTML) (PDF)
Explains how to use system configuration services for network configuration and management, including determining reachability and getting connected.
Guides 2006-02-07
GetPrimaryMACAddress (HTML) (DMG) (ZIP)
Demonstrates retrieving the MAC address of the built-in Ethernet controller. Useful for uniquely identifying a Macintosh system.
Sample Code 2005-10-27
SocketCancel (HTML) (DMG) (ZIP)
Shows how to safely cancel threads that are blocked within BSD sockets calls.
Sample Code 2005-08-10
SimpleDial (HTML) (DMG) (ZIP)
Demonstrates management of dialup connections, such as PPP, using System Configuration framework network connection API.
Sample Code 2005-07-26
SimpleReach (HTML) (DMG) (ZIP)
Demonstrates network host reachability testing using the System Configuration framework asynchronous network reachability API.
Sample Code 2005-07-26
Mixing link-local IP addresses and routable IP addresses (HTML)
QA1357: Explains how to enable communication between devices with link-local addresses and devices with routable addresses.
Technical Q&As 2005-07-06
DNSServiceMetaQuery (HTML) (DMG) (ZIP)
Shows how to discover Bonjour service types being advertised on the local network.
Sample Code 2005-06-01
Writing Open Directory Plug-ins (HTML)
Learn how to write Open Directory plug-ins to help your application locate and manage network information.
Articles 2004-09-13
Bonjour enforces the TXT record format in Panther (HTML)
QA1306: Explains how mDNSResponder enforces the proper TXT record format in Panther.
Technical Q&As 2004-07-14
Updating the TXT record of a Bonjour service (HTML)
QA1302: Explains how to update a Bonjour TXT record while running on either Jaguar or Panther.
Technical Q&As 2004-07-14
Discovering all advertised Bonjour service types (HTML)
QA1337: Explains how to discover all Bonjour service types being advertised on the local network.
Technical Q&As 2004-06-01
MoreIsBetter (HTML) (DMG) (ZIP)
Library providing indispensable wrapers and workarounds for many areas of Mac OS programming.
Sample Code 2003-10-27
SimplePing (HTML) (DMG) (ZIP)
Sample provides simple API to programatically ping a remote host without admin privileges
Sample Code 2003-10-27
QISA (HTML) (DMG) (ZIP)
Demonstrates the basics of writing an Internet setup assistant for traditional Mac OS and Mac OS X.
Sample Code 2003-05-15
GetMACAddressSample (HTML) (DMG) (ZIP)
Demonstrates how to retrieve the MAC address for each Ethernet interface from the Mac OS X I/O Registry.
Sample Code 2003-01-14