Struct NEFilterPacketProvider

Source

#[repr(C)]
pub struct NEFilterPacketProvider { /* private fields */ }

Expand description

The NEFilterPacketProvider class declares the programmatic interface for an object that evaluates network packets decisions about whether to block, allow, or delay the packets.

Implementations§

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impl NEFilterPacketProvider

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pub unsafe fn delayCurrentPacket( &self, context: &NEFilterPacketContext, ) -> Retained<NEPacket>

This function is used to delay a packet currently presented by packetHandler. This function is only valid within the packetHandler block and a verdict of NEFilterPacketProviderVerdictDelay must be returned after a packet is delayed. A delayed packet will be prevented from continuing its journey through the networking stack until it is either allowed by calling allow() or is dropped by being released.

Parameter context: The context of the current packet filter which is passed to the packetHandler block. The packetHandler block must pass this context when calling delayCurrentPacket().

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pub unsafe fn allowPacket(&self, packet: &NEPacket)

This function is used to allow a previously-delayed packet to continue its journey into or out of the networking stack.

Parameter packet: A NEPacket object that contains the data of the packet that was previously delayed by the NEFilterPacketProvider.

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impl NEFilterPacketProvider

Methods declared on superclass NSObject.

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pub unsafe fn init(this: Allocated<Self>) -> Retained<Self>

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pub unsafe fn new() -> Retained<Self>

Methods from Deref<Target = NEFilterProvider>§

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pub unsafe fn startFilterWithCompletionHandler( &self, completion_handler: &DynBlock<dyn Fn(*mut NSError)>, )

Available on crate feature block2 only.

This function is called by the framework when the content filter is being started. Subclasses must override this method and perform whatever steps are necessary to start the filter.

Parameter completionHandler: A block that must be called when the process of starting the filter is complete. If the filter was started successfully, subclass implementations must pass the nil value to this block. If an error occurred while starting the filter, sublcass implementations must pass a non-nil NSError containing more details about the error.

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pub unsafe fn stopFilterWithReason_completionHandler( &self, reason: NEProviderStopReason, completion_handler: &DynBlock<dyn Fn()>, )

Available on crate feature block2 only.

This function is called by the framework when the content filter is being stopped. Subclasses must override this method and perform whatever steps are necessary to stop the filter.

Parameter reason: An NEProviderStopReason indicating why the filter is being stopped.

Parameter completionHandler: A block that must be called when the process of stopping the filter is complete.

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pub unsafe fn filterConfiguration( &self, ) -> Retained<NEFilterProviderConfiguration>

An NEContentFilterConfiguration object containing the current filter configuration. The value of this property can change during the lifetime of a filter. Filter implementations can use KVO to be notified when the configuration changes.

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pub unsafe fn handleReport(&self, report: &NEFilterReport)

This function is called by the framework when the data provider extension returns a verdict with the report property set to True. Subclass implementations may override this method to handle the flow report.

Parameter report: The report being delivered.

Methods from Deref<Target = NEProvider>§

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pub unsafe fn sleepWithCompletionHandler( &self, completion_handler: &DynBlock<dyn Fn()>, )

Available on crate feature block2 only.

This function is called by the framework when the system is about to go to sleep. Subclass developers can override this method to implement custom behavior such as closing connections or pausing some network activity.

Parameter completionHandler: When the method is finished handling the sleep event it must execute this completion handler.

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pub unsafe fn wake(&self)

This function is called by the framework immediately after the system wakes up from sleep. Subclass developers can override this method to implement custom behavior such as re-establishing connections or resuming some network activity.

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pub unsafe fn createTCPConnectionToEndpoint_enableTLS_TLSParameters_delegate( &self, remote_endpoint: &NWEndpoint, enable_tls: bool, tls_parameters: Option<&NWTLSParameters>, delegate: Option<&AnyObject>, ) -> Retained<NWTCPConnection>

👎Deprecated: Use nw_connection_t in Network framework instead

This function can be called by subclass implementations to create a TCP connection to a given network endpoint. This function should not be overridden by subclasses.

Parameter remoteEndpoint: An NWEndpoint object that specifies the remote network endpoint to connect to.

Parameter enableTLS: A flag indicating if a TLS session should be negotiated on the connection.

Parameter TLSParameters: A set of optional TLS parameters. Only valid if enableTLS is YES. If TLSParameters is nil, the default system parameters will be used for TLS negotiation.

Parameter delegate: An object to use as the connections delegate. This object should conform to the NWTCPConnectionAuthenticationDelegate protocol.

Returns: An NWTCPConnection object.

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pub unsafe fn createUDPSessionToEndpoint_fromEndpoint( &self, remote_endpoint: &NWEndpoint, local_endpoint: Option<&NWHostEndpoint>, ) -> Retained<NWUDPSession>

👎Deprecated: Use nw_connection_t in Network framework instead

This function can be called by subclass implementations to create a UDP session between a local network endpoint and a remote network endpoint. This function should not be overridden by subclasses.

Parameter remoteEndpoint: An NWEndpoint object that specifies the remote endpoint to which UDP datagrams will be sent by the UDP session.

Parameter localEndpoint: An NWHostEndpoint object that specifies the local IP address endpoint to use as the source endpoint of the UDP session.

Returns: An NWUDPSession object.

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pub unsafe fn displayMessage_completionHandler( &self, message: &NSString, completion_handler: &DynBlock<dyn Fn(Bool)>, )

👎Deprecated

Available on crate feature block2 only.

This method can be called by subclass implementations to display a message to the user.

Parameter message: The message to be displayed.

Parameter completionHandler: A block that is executed when the user acknowledges the message. If this method is called on a NEFilterDataProvider instance or the message cannot be displayed, then the completion handler block will be executed immediately with success parameter set to NO. If the message was successfully displayed to the user, then the completion handler block is executed with the success parameter set to YES when the user dismisses the message.

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pub unsafe fn defaultPath(&self) -> Option<Retained<NWPath>>

👎Deprecated: Use nw_path_monitor_t in Network framework instead

The current default path for connections created by the provider. Use KVO to watch for network changes.

Methods from Deref<Target = NSObject>§

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pub fn doesNotRecognizeSelector(&self, sel: Sel) -> !

Handle messages the object doesn’t recognize.

See Apple’s documentation for details.

Methods from Deref<Target = AnyObject>§

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pub fn class(&self) -> &'static AnyClass

Dynamically find the class of this object.

§Panics

May panic if the object is invalid (which may be the case for objects returned from unavailable init/new methods).

§Example

Check that an instance of NSObject has the precise class NSObject.

use objc2::ClassType;
use objc2::runtime::NSObject;

let obj = NSObject::new();
assert_eq!(obj.class(), NSObject::class());

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pub unsafe fn get_ivar<T>(&self, name: &str) -> &T
where T: Encode,

👎Deprecated: this is difficult to use correctly, use Ivar::load instead.

Use Ivar::load instead.

§Safety

The object must have an instance variable with the given name, and it must be of type T.

See Ivar::load_ptr for details surrounding this.

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pub fn downcast_ref<T>(&self) -> Option<&T>
where T: DowncastTarget,

Attempt to downcast the object to a class of type T.

This is the reference-variant. Use Retained::downcast if you want to convert a retained object to another type.

§Mutable classes

Some classes have immutable and mutable variants, such as NSString and NSMutableString.

When some Objective-C API signature says it gives you an immutable class, it generally expects you to not mutate that, even though it may technically be mutable “under the hood”.

So using this method to convert a NSString to a NSMutableString, while not unsound, is generally frowned upon unless you created the string yourself, or the API explicitly documents the string to be mutable.

See Apple’s documentation on mutability and on isKindOfClass: for more details.

§Generic classes

Objective-C generics are called “lightweight generics”, and that’s because they aren’t exposed in the runtime. This makes it impossible to safely downcast to generic collections, so this is disallowed by this method.

You can, however, safely downcast to generic collections where all the type-parameters are AnyObject.

§Panics

This works internally by calling isKindOfClass:. That means that the object must have the instance method of that name, and an exception will be thrown (if CoreFoundation is linked) or the process will abort if that is not the case. In the vast majority of cases, you don’t need to worry about this, since both root objects NSObject and NSProxy implement this method.

§Examples

Cast an NSString back and forth from NSObject.

use objc2::rc::Retained;
use objc2_foundation::{NSObject, NSString};

let obj: Retained<NSObject> = NSString::new().into_super();
let string = obj.downcast_ref::<NSString>().unwrap();
// Or with `downcast`, if we do not need the object afterwards
let string = obj.downcast::<NSString>().unwrap();

Try (and fail) to cast an NSObject to an NSString.

use objc2_foundation::{NSObject, NSString};

let obj = NSObject::new();
assert!(obj.downcast_ref::<NSString>().is_none());

Try to cast to an array of strings.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);
// This is invalid and doesn't type check.
let arr = arr.downcast_ref::<NSArray<NSString>>();

This fails to compile, since it would require enumerating over the array to ensure that each element is of the desired type, which is a performance pitfall.

Downcast when processing each element instead.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);

for elem in arr {
    if let Some(data) = elem.downcast_ref::<NSString>() {
        // handle `data`
    }
}