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This article explains how to work with sockets and socket streams at various levels, from POSIX through Foundation.

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Important: This article describes ways to make socket connections that are completely under the control of your program. Most programs would be better served by higher-level APIs such as NSURLConnection. To learn more about these higher-level APIs, read Networking Overview.

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The APIs described in this article should be used only if you need to support some protocol other than the protocols supported by built-in Cocoa or Core Foundation functionality.

At almost every level of networking, software can be divided into two categories: clients (programs that connect to other apps) and services (programs that other apps connect to). At a high level, these lines are clear. Most programs written using high-level APIs are purely clients. At a lower level, however, the lines are often blurry.

Socket and stream programming generally falls into one of the following broad categories:

Packet-based communication—Programs that operate on one packet at a time, listening for incoming packets, then sending packets in reply.
With packet-based communication, the only differences between clients and servers are the contents of the packets that each program sends and receives, and (presumably) what each program does with the data. The networking code itself is identical.
Stream-based clients—Programs that use TCP to send and receive data as two continuous streams of bytes, one in each direction.
With stream-based communication, clients and servers are somewhat more distinct. The actual data handling part of clients and servers is similar, but the way that the program initially constructs the communication channel is very different.

This chapter is divided into sections based on the above tasks:

Choosing an API Family—Describes how to decide which API family to use when writing networking code.
Writing a TCP-Based Client—Describes how to make outgoing TCP connections to existing servers and services.
Writing a TCP-Based Server—Describes how to listen for incoming TCP connections when writing servers and services.
Working with Packet-Based Sockets—Describes how to work with non-TCP protocols, such as UDP.

Choosing an API Family

The API you choose for socket-based connections depends on whether you are making a connection to another host or receiving a connection from another host. It also depends on whether you are using TCP or some other protocol. Here are a few factors to consider:

In OS X, if you already have networking code that is shared with non-Apple platforms, you can use POSIX C networking APIs and continue to use your networking code as-is (on a separate thread). If your program is based on a Core Foundation or Cocoa (Foundation) run loop, you can also use the Core Foundation CFStream API to integrate the POSIX networking code into your overall architecture on the main thread. Alternatively, if you are using Grand Central Dispatch (GCD), you can add a socket as a dispatch source.
In iOS, POSIX networking is discouraged because it does not activate the cellular radio or on-demand VPN. Thus, as a general rule, you should separate the networking code from any common data processing functionality and rewrite the networking code using higher-level APIs.
Note: If you use POSIX networking code, you should be aware that the POSIX networking API is not protocol-agnostic (you must handle some of the differences between IPv4 and IPv6 yourself). It is a connect-by-IP API rather than a connect-by-name API, which means that you must do a lot of extra work if you want to achieve the same initial-connection performance and robustness that higher-level APIs give you for free. Before you decide to reuse existing POSIX networking code, be sure to read Avoid Resolving DNS Names Before Connecting to a Host in Networking Overview.
For daemons and services that listen on a port, or for non-TCP connections, use POSIX or Core Foundation (CFSocket) C networking APIs.
For client code in Objective-C, use Foundation Objective-C networking APIs. Foundation defines high-level classes for managing URL connections, socket streams, network services, and other networking tasks. It is also the primary non-UI Objective-C framework in OS X and iOS, providing routines for run loops, string handling, collection objects, file access, and so on.
For client code in C, use Core Foundation C networking APIs. The Core Foundation framework and the CFNetwork framework are two of the primary C-language frameworks in OS X and iOS. Together they define the functions and structures upon which the Foundation networking classes are built.
Note: In OS X, CFNetwork is a subframework of the Core Services framework; in iOS, CFNetwork is a top-level framework.

Writing a TCP-Based Client

The way you make an outgoing connection depends on what programming language you are using, on the type of connection (TCP, UDP, and so forth), and on whether you are trying to share code with other (non-Mac, non-iOS) platforms.

Use NSStream for outgoing connections in Objective-C.
If you are connecting to a specific host, create a CFHost object (not NSHost—they are not toll-free bridged), then use CFStreamCreatePairWithSocketToHost or CFStreamCreatePairWithSocketToCFHost to open a socket connected to that host and port and associate a pair of CFStream objects with it. You can then cast these to an NSStream object.
You can also use the CFStreamCreatePairWithSocketToNetService function with a CFNetServiceRef object to connect to a Bonjour service. Read Discovering and Advertising Network Services in Networking Overview for more information.
Note: The getStreamsToHost:port:inputStream:outputStream: method of NSNetService is not available on iOS, and is discouraged on OS X for performance reasons. Specifically, NSNetService requires you to create an instance of NSHost. When you create the object, the lookup is performed synchronously. Thus, it is unsafe to construct an NSHost object on your main application thread. See NSNetService and Automatic Reference Counting (ARC) for details.
Use CFStream for outgoing connections in C.
If you are writing code that cannot include Objective-C, use the CFStream API. It integrates more easily with other Core Foundation APIs than CFSocket, and enables the cellular hardware on iOS (where applicable), unlike lower-level APIs. You can use CFStreamCreatePairWithSocketToHost or CFStreamCreatePairWithSocketToCFHost to open a socket connected to a given host and port and associate a pair of CFStream objects with it.
You can also use the CFStreamCreatePairWithSocketToNetService function to connect to a Bonjour service. Read Discovering and Advertising Network Services in Networking Overview for more information.
Use POSIX calls if cross-platform portability is required.
If you are writing networking code that runs exclusively in OS X and iOS, you should generally avoid POSIX networking calls, because they are harder to work with than higher-level APIs. However, if you are writing networking code that must be shared with other platforms, you can use the POSIX networking APIs so that you can use the same code everywhere.
Never use synchronous POSIX networking APIs on the main thread of a GUI application. If you use synchronous networking calls in a GUI application, you must do so on a separate thread.
Note: POSIX networking does not activate the cellular radio on iOS. For this reason, the POSIX networking API is generally discouraged in iOS.

The subsections below describe the use of NSStream. Except where noted, the CFStream API has functions with similar names, and behaves similarly.

To learn more about the POSIX socket API, read the UNIX Socket FAQ at http://developerweb.net/.

Establishing a Connection

As a rule, the recommended way to establish a TCP connection to a remote host is with streams. Streams automatically handle many of the challenges that TCP connections present. For example, streams provide the ability to connect by hostname, and in iOS, they automatically activate a device’s cellular modem or on-demand VPN when needed (unlike CFSocket or BSD sockets). Streams are also a more Cocoa-like networking interface than lower-level protocols, behaving in a way that is largely compatible with the Cocoa file stream APIs.

The way you obtain input and output streams for a host depends on whether you used service discovery to discover the host:

If you already know the DNS name or IP address of the remote host, obtain Core Foundation read (input) and write (output) streams with the CFStreamCreatePairWithSocketToHost function. You can then take advantage of the toll-free bridge between CFStream and NSStream to cast your CFReadStreamRef and CFWriteStreamRef objects to NSInputStream and NSOutputStream objects.
If you discovered the host by browsing for network services with a CFNetServiceBrowser object, you obtain input and output streams for the service with the CFStreamCreatePairWithSocketToNetService function. Read Discovering and Advertising Network Services in Networking Overview for more information.

After you have obtained your input and output streams, you should retain them immediately if you are not using automatic reference counting. Then cast them to NSInputStream and NSOutputStream objects, set their delegate objects (which should conform to the NSStreamDelegate protocol), schedule them on the current run loop, and call their open methods.

Note: If you are working with more than one connection at a time, you must also keep track of which input stream is associated with a given output stream and vice versa. The most straightforward way to do this is to create your own connection object that holds references to both streams, and then set that object as the delegate for each stream.

Handling Events

When the stream:handleEvent: method is called on the NSOutputStream object’s delegate and the streamEvent parameter’s value is NSStreamEventHasSpaceAvailable, call write:maxLength: to send data. This method returns the number of bytes written or a negative number on error. If fewer bytes were written than you tried to send, you must queue up the remaining data and send it after the delegate method gets called again with an NSStreamEventHasSpaceAvailable event. If an error occurs, you should call streamError to find out what went wrong.

When the stream:handleEvent: method is called on your NSInputStream object’s delegate and the streamEvent parameter’s value is NSStreamEventHasBytesAvailable, your input stream has received data that you can read with the read:maxLength: method. This method returns the number of bytes read, or a negative number on error.

If fewer bytes were read than you need, you must queue the data and wait until you receive another stream event with additional data. If an error occurs, you should call streamError to find out what went wrong.

If the other end of the connection closes the connection:

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Your connection delegate’s stream:handleEvent: method is called with streamEvent set to NSStreamEventHasBytesAvailable. When you read from that stream, you get a length of zero (0).
Your connection delegate’s stream:handleEvent: method is called with streamEvent set to NSStreamEventEndEncountered.

When either of these two events occurs, the delegate method is responsible for detecting the end-of-file condition and cleaning up.

Closing the Connection

To close your connection, unschedule it from the run loop, set the connection’s delegate to nil (the delegate is unretained), close both of the associated streams with the close method, and then release the streams themselves (if you are not using ARC) or set them to nil (if you are). By default, this closes the underlying socket connection. There are two situations in which you must close it yourself, however:

If you previously set the kCFStreamPropertyShouldCloseNativeSocket to kCFBooleanFalse by calling setProperty:forKey: on the stream.
If you created the streams based on an existing BSD socket by calling CFStreamCreatePairWithSocket.
By default, streams created from an existing native socket do not close their underlying socket. However, you can enable automatic closing by setting the kCFStreamPropertyShouldCloseNativeSocket to kCFBooleanTrue with the setProperty:forKey: method.

For More Information

To learn more, read Setting Up Socket Streams in Stream Programming Guide, Using NSStreams For A TCP Connection Without NSHost, or see the SimpleNetworkStreams and RemoteCurrency sample code projects.

Writing a TCP-Based Server

As mentioned previously, a server and a client are similar once the connection is established. The main difference is that clients make outgoing connections, whereas servers create a listening socket (sometimes listen socket)—a socket that listens for incoming connections—then accept connections on that socket. After that, each resulting connection behaves just like a connection you might make in a client.

The API you should choose for your server depends primarily on whether you are trying to share the code with other (non-Mac, non-iOS) platforms. There are only two APIs that provide the ability to listen for incoming network connections: the Core Foundation socket API and the POSIX (BSD) socket API. Higher-level APIs cannot be used for accepting incoming connections.

If you are writing code for OS X and iOS exclusively, use POSIX networking calls to set up your network sockets. Then, use GCD or CFSocket to integrate the sockets into your run loop.
Use pure POSIX networking code with a POSIX-based run loop (select) if cross-platform portability with non-Apple platforms is required.
If you are writing networking code that runs exclusively in OS X and iOS, you should generally avoid POSIX networking calls because they are harder to work with than higher level APIs. However, if you are writing networking code that must be shared with other platforms, you can use the POSIX networking APIs so that you can use the same code everywhere.
Never use NSSocketPort or NSFileHandle for general socket communication. For details, see Do Not Use NSSocketPort (OS X) or NSFileHandle for General Socket Communication in Networking Overview.

The following sections describe how to use these APIs to listen for incoming connections.

Listening with Core Foundation

To use Core Foundation APIs to listen for incoming connections, you must do the following:

Add appropriate includes:
Create socket objects (returned as a CFSocketRef object) with the CFSocketCreate or CFSocketCreateWithNative function. Specify kCFSocketAcceptCallBack as the callBackTypes parameter value. Provide a pointer to a CFSocketCallBack callback function as the callout parameter value.
Bind a socket with the CFSocketSetAddress function. Provide a CFData object containing a sockaddr struct that specifies information about the desired port and family.
Begin listening on a socket by adding the socket to a run loop.
Create a run-loop source for a socket with the CFSocketCreateRunLoopSource function. Then, add the socket to a run loop by providing its run-loop source to the CFRunLoopAddSource function.

After this, you can access the underlying BSD socket descriptor with the CFSocketGetNative function.

When you are through with the socket, you must close it by calling CFSocketInvalidate.

In your listening socket’s callback function (handleConnect in this case), you should check to make sure the value of the callbackType parameter is kCFSocketAcceptCallBack, which means that a new connection has been accepted. In this case, the data parameter of the callback is a pointer to a CFSocketNativeHandle value (an integer socket number) representing the socket.

To handle the new incoming connections, you can use the CFStream, NSStream, or CFSocket APIs. The stream-based APIs are strongly recommended.

To do this:

Create read and write streams for the socket with the CFStreamCreatePairWithSocket function.
Cast the streams to an NSInputStream object and an NSOutputStream object if you are working in Cocoa.
Use the streams as described in Writing a TCP-Based Client.

For more information, see CFSocket Reference. For sample code, see the RemoteCurrency and WiTap sample code projects.

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Listening with POSIX Socket APIs

POSIX networking is fairly similar to the CFSocket API, except that you have to write your own run-loop-handling code.

Important: Never use POSIX networking APIs on the main thread of a GUI application. If you use POSIX networking in a GUI application, you must either do so on a separate thread or use GCD.

Here are the basic steps for creating a POSIX-level server:

Create a socket by calling socket. For example:
Bind it to a port.
- If you have a specific port in mind, use that.
- If you don’t have a specific port in mind, pass zero for the port number, and the operating system will assign you an ephemeral port. (If you are going to advertise your service with Bonjour, you should almost always use an ephemeral port.)
For example:
If you are using an ephemeral port, call getsockname to find out what port you are using. You can then register this port with Bonjour. For example:
Call listen to begin listening for incoming connections on that port.

The next steps depend on whether you intend to use pure POSIX socket code or a higher level abstraction.

Handling Events with Core Foundation

Call CFSocketCreateWithNative. Then follow the directions in Listening with Core Foundation, beginning at step 3.

Handling Events with Grand Central Dispatch

GCD allows you to perform operations asynchronously, and provides an event queue mechanism for determining when to read data from the socket. After creating the listening socket, a GCD-based server should:

Call dispatch_source_create to create a dispatch source for the listening socket, specifying DISPATCH_SOURCE_TYPE_READ as the source type.
Call dispatch_source_set_event_handler (or dispatch_source_set_event_handler_f and dispatch_set_context) to set a handler that gets called whenever a new connection arrives on the socket.
When the listen socket handler is called (upon a new connection), it should:
- Call accept. This function fills a new sockaddr structure with information about the connection and returns a new socket for that connection.
  If desired, call ntohl(my_sockaddr_obj.sin_addr.s_addr) to determine the client’s IP address.
- Call dispatch_source_create to create a dispatch source for the client socket, specifying DISPATCH_SOURCE_TYPE_READ as the source type.
- Call setsockopt to set the SO_NOSIGPIPE flag on the socket.
- Call dispatch_source_set_event_handler (or dispatch_source_set_event_handler_f and dispatch_set_context) to set a handler that gets called whenever the state of the connection changes.
In the client socket handler, call dispatch_async or dispatch_async_f and pass a block that calls read on the socket to grab any new data, then handle that data appropriately. This block can also send responses by calling write on the socket.

Handling Events with Pure POSIX Code

Create a file descriptor set and add new sockets to that set as new connections come in.
If you need to perform actions periodically on your networking thread, construct a timeval structure for the select timeout.
It is important to choose a timeout that is reasonable. Short timeout values bog down the system by causing your process to run more frequently than is necessary. Unless you are doing something very unusual, your select loop should not wake more than a few times per second, at most, and on iOS, you should try to avoid doing this at all. For alternatives, read Avoid POSIX Sockets and CFSocket on iOS Where Possible in Networking Overview.
If you do not need to perform periodic actions, pass NULL.
Call select in a loop, passing two separate copies of that file descriptor set (created by calling FD_COPY) for the read and write descriptor sets. The select system call modifies these descriptor sets, clearing any descriptors that are not ready for reading or writing.
For the timeout parameter, pass the timeval structure you created earlier. Although OS X and iOS do not modify this structure, some other operating systems replace this value with the amount of time remaining. Thus, for cross-platform compatibility, you must reset this value each time you call select.
For the nfds parameter, pass a number that is one higher than the highest-numbered file descriptor that is actually in use.
Read data from sockets, calling FD_ISSET to determine if a given socket has pending data.
Write data to calling FD_ISSET to determine if a given socket has room for new data.
Maintain appropriate queues for incoming and outgoing data.

As an alternative to the POSIX select function, the BSD-specific kqueue API can also be used to handle socket events.

For More Information

To learn more about POSIX networking, read the socket, listen, FD_SET, and select manual pages.

Working with Packet-Based Sockets

The recommended way to send and receive UDP packets is by combining the POSIX API and either the CFSocket or GCD APIs. To use these APIs, you must perform the following steps:

Create a socket by calling socket.
Bind the socket by calling bind. Provide a sockaddr struct that specifies information about the desired port and family.
Connect the socket by calling connect (optional).
Note that a connected UDP socket is not a connection in the purest sense of the word. However, it provides two advantages over an unconnected socket. First, it removes the need to specify the destination address every time you send a new message. Second, your app may receive errors when a packet cannot be delivered. This error delivery is not guaranteed with UDP, however; it is dependent on network conditions that are beyond your app’s control.

From there, you can work with the connection in three ways:

If you are using GCD for run loop integration (recommended), create a dispatch source by calling dispatch_source_create. Assign an event handler to the dispatch source. Optionally assign a cancellation handler. Finally, pass the dispatch source to the dispatch_resume function to begin handling events.
If you are using CFSocket for integration, this technique is somewhat more complicated, but makes it easier to interface your code with some Cocoa APIs. However, CFSocket objects use a single object to represent a connection (much like sockets at the POSIX layer), whereas most Cocoa APIs are designed to interface with stream-based APIs that use separate objects for sending and receiving. As a result, some Cocoa APIs that expect read or write streams may be difficult to use in conjunction with CFSocketRef objects.
To use CFSocket:
1. Create an object to use for managing the connection. If you are writing Objective-C code, this can be a class. If you are writing pure C code, this should be a Core Foundation object, such as a mutable dictionary.
2. Create a context object to describe that object.
3. Create a CFSocket object (CFSocketRef) for the CFSocketNativeHandle object by calling CFSocketCreateWithNative.
  Be sure to set (at minimum) the kCFSocketDataCallBack flag in your callBackTypes parameter value. Do not set the kCFSocketAcceptCallBack flag.
  You’ll also need to provide a pointer to a CFSocketCallBack callback function as the callout parameter value.
  For example:
4. Tell Core Foundation that it is allowed to close the socket when the underlying Core Foundation object is invalidated.
5. Create an event source for the socket and schedule it on your run loop.
Whenever new data becomes available, the data handler callback gets called. In your callback, if the value of the callbackType parameter is kCFSocketConnectCallBack, check the data parameter passed into the callback. If it is NULL, you have connected to the host. You can then send data using the CFSocketSendData function.
When you are finished with the socket, close and invalidate it by calling the CFSocketInvalidate function.
At any point, you can also access the underlying BSD socket by calling the CFSocketGetNative function.
For more information, see CFSocket Reference. For sample code, see the UDPEcho sample code project.
If you are using pure POSIX sockets, use the select system call to wait for data, then use the read and write system calls to perform I/O. To learn more about sending and receiving UDP packets with the POSIX socket API, read the UNIX Socket FAQ at http://developerweb.net/.

Obtaining the Native Socket Handle for a Socket Stream

Sometimes when working with socket-based streams (NSInputStream, NSOutputStream, CFReadStream, or CFWriteStream), you may need to obtain the underlying socket handle associated with a stream. For example, you might want to find out the IP address and port number for each end of the stream with getsockname and getpeername, or set socket options with setsockopt.

To obtain the native socket handle for an input stream, call the following method:

You can do the same thing with an output stream, but you only need to do this with one or the other because the input and output streams for a given connection always share the same underlying native socket.

Note: If you are working with a Core Foundation stream, you can do the same thing with CFReadStreamCopyProperty, CFDataGetLength, and CFDataGetBytes.