/*

File: ReceiveServerController.m

Contains: Manages the receive server tab.

Written by: DTS

Copyright: Copyright (c) 2009-2012 Apple Inc. All Rights Reserved.

Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc.

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original Apple software (the "Apple Software"), to use,

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The Apple Software is provided by Apple on an "AS IS" basis.

APPLE MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING

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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING

THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

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*/

#import "ReceiveServerController.h"

#import "NetworkManager.h"

#include <CFNetwork/CFNetwork.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <unistd.h>

@interface ReceiveServerController () <NSStreamDelegate, NSNetServiceDelegate>

// stuff for IB

@property (nonatomic, strong, readwrite) IBOutlet UIImageView * imageView;

@property (nonatomic, strong, readwrite) IBOutlet UILabel * statusLabel;

@property (nonatomic, strong, readwrite) IBOutlet UIActivityIndicatorView * activityIndicator;

@property (nonatomic, strong, readwrite) IBOutlet UIButton * startOrStopButton;

- (IBAction)startOrStopAction:(id)sender;

// private properties

@property (nonatomic, assign, readonly ) BOOL isStarted;

@property (nonatomic, assign, readonly ) BOOL isReceiving;

@property (nonatomic, strong, readwrite) NSNetService * netService;

@property (nonatomic, assign, readwrite) CFSocketRef listeningSocket;

@property (nonatomic, strong, readwrite) NSInputStream * networkStream;

@property (nonatomic, strong, readwrite) NSOutputStream * fileStream;

@property (nonatomic, copy, readwrite) NSString * filePath;

// forward declarations

- (void)stopServer:(NSString *)reason;

@end

@implementation ReceiveServerController

@synthesize netService = _netService;

@synthesize networkStream = _networkStream;

@synthesize listeningSocket = _listeningSocket;

@synthesize fileStream = _fileStream;

@synthesize filePath = _filePath;

@synthesize imageView = _imageView;

@synthesize statusLabel = _statusLabel;

@synthesize activityIndicator = _activityIndicator;

@synthesize startOrStopButton = _startOrStopButton;

#pragma mark * Status management

// These methods are used by the core transfer code to update the UI.

- (void)serverDidStartOnPort:(NSUInteger)port

{

assert( (port != 0) && (port < 65536) );

self.statusLabel.text = [NSString stringWithFormat:@"Started on port %zu", (size_t) port];

[self.startOrStopButton setTitle:@"Stop" forState:UIControlStateNormal];

self.tabBarItem.image = [UIImage imageNamed:@"receiveserverOn.png"];

}

- (void)serverDidStopWithReason:(NSString *)reason

{

if (reason == nil) {

reason = @"Stopped";

}

self.statusLabel.text = reason;

[self.startOrStopButton setTitle:@"Start" forState:UIControlStateNormal];

self.tabBarItem.image = [UIImage imageNamed:@"receiveserverOff.png"];

}

- (void)receiveDidStart

{

self.statusLabel.text = @"Receiving";

self.imageView.image = [UIImage imageNamed:@"NoImage.png"];

[self.activityIndicator startAnimating];

[[NetworkManager sharedInstance] didStartNetworkOperation];

}

- (void)updateStatus:(NSString *)statusString

{

assert(statusString != nil);

self.statusLabel.text = statusString;

}

- (void)receiveDidStopWithStatus:(NSString *)statusString

{

if (statusString == nil) {

assert(self.filePath != nil);

self.imageView.image = [UIImage imageWithContentsOfFile:self.filePath];

statusString = @"Receive succeeded";

}

self.statusLabel.text = statusString;

[self.activityIndicator stopAnimating];

[[NetworkManager sharedInstance] didStopNetworkOperation];

}

#pragma mark * Core transfer code

// This is the code that actually does the networking.

- (BOOL)isStarted

{

return (self.netService != nil);

}

- (BOOL)isReceiving

{

return (self.networkStream != nil);

}

- (void)startReceive:(int)fd

{

CFReadStreamRef readStream;

assert(fd >= 0);

assert(self.networkStream == nil); // can't already be receiving

assert(self.fileStream == nil); // ditto

assert(self.filePath == nil); // ditto

// Open a stream for the file we're going to receive into.

self.filePath = [[NetworkManager sharedInstance] pathForTemporaryFileWithPrefix:@"Receive"];

assert(self.filePath != nil);

self.fileStream = [NSOutputStream outputStreamToFileAtPath:self.filePath append:NO];

assert(self.fileStream != nil);

[self.fileStream open];

// Open a stream based on the existing socket file descriptor. Then configure

// the stream for async operation.

CFStreamCreatePairWithSocket(NULL, fd, &readStream, NULL);

assert(readStream != NULL);

self.networkStream = (__bridge NSInputStream *) readStream;

CFRelease(readStream);

[self.networkStream setProperty:(id)kCFBooleanTrue forKey:(NSString *)kCFStreamPropertyShouldCloseNativeSocket];

self.networkStream.delegate = self;

[self.networkStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

[self.networkStream open];

// Tell the UI we're receiving.

[self receiveDidStart];

}

- (void)stopReceiveWithStatus:(NSString *)statusString

{

if (self.networkStream != nil) {

self.networkStream.delegate = nil;

[self.networkStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

[self.networkStream close];

self.networkStream = nil;

}

if (self.fileStream != nil) {

[self.fileStream close];

self.fileStream = nil;

}

[self receiveDidStopWithStatus:statusString];

self.filePath = nil;

}

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode

// An NSStream delegate callback that's called when events happen on our

// network stream.

{

assert(aStream == self.networkStream);

#pragma unused(aStream)

switch (eventCode) {

case NSStreamEventOpenCompleted: {

[self updateStatus:@"Opened connection"];

} break;

case NSStreamEventHasBytesAvailable: {

NSInteger bytesRead;

uint8_t buffer[32768];

[self updateStatus:@"Receiving"];

// Pull some data off the network.

bytesRead = [self.networkStream read:buffer maxLength:sizeof(buffer)];

if (bytesRead == -1) {

[self stopReceiveWithStatus:@"Network read error"];

} else if (bytesRead == 0) {

[self stopReceiveWithStatus:nil];

} else {

NSInteger bytesWritten;

NSInteger bytesWrittenSoFar;

// Write to the file.

bytesWrittenSoFar = 0;

do {

bytesWritten = [self.fileStream write:&buffer[bytesWrittenSoFar] maxLength:bytesRead - bytesWrittenSoFar];

assert(bytesWritten != 0);

if (bytesWritten == -1) {

[self stopReceiveWithStatus:@"File write error"];

break;

} else {

bytesWrittenSoFar += bytesWritten;

}

} while (bytesWrittenSoFar != bytesRead);

}

} break;

case NSStreamEventHasSpaceAvailable: {

assert(NO); // should never happen for the output stream

} break;

case NSStreamEventErrorOccurred: {

[self stopReceiveWithStatus:@"Stream open error"];

} break;

case NSStreamEventEndEncountered: {

// ignore

} break;

default: {

assert(NO);

} break;

}

}

- (void)acceptConnection:(int)fd

{

int junk;

// If we already have a connection, reject this new one. This is one of the

// big simplifying assumptions in this code. A real server should handle

// multiple simultaneous connections.

if ( self.isReceiving ) {

junk = close(fd);

assert(junk == 0);

} else {

[self startReceive:fd];

}

}

static void AcceptCallback(CFSocketRef s, CFSocketCallBackType type, CFDataRef address, const void *data, void *info)

// Called by CFSocket when someone connects to our listening socket.

// This implementation just bounces the request up to Objective-C.

{

ReceiveServerController * obj;

#pragma unused(type)

assert(type == kCFSocketAcceptCallBack);

#pragma unused(address)

// assert(address == NULL);

assert(data != NULL);

obj = (__bridge ReceiveServerController *) info;

assert(obj != nil);

assert(s == obj->_listeningSocket);

#pragma unused(s)

[obj acceptConnection:*(int *)data];

}

- (void)netService:(NSNetService *)sender didNotPublish:(NSDictionary *)errorDict

// A NSNetService delegate callback that's called if our Bonjour registration

// fails. We respond by shutting down the server.

//

// This is another of the big simplifying assumptions in this sample.

// A real server would use the real name of the device for registrations,

// and handle automatically renaming the service on conflicts. A real

// client would allow the user to browse for services. To simplify things

// we just hard-wire the service name in the client and, in the server, fail

// if there's a service name conflict.

{

#pragma unused(sender)

assert(sender == self.netService);

#pragma unused(errorDict)

[self stopServer:@"Registration failed"];

}

- (void)startServer

{

BOOL success;

int err;

int fd;

int junk;

struct sockaddr_in addr;

NSUInteger port;

// Create a listening socket and use CFSocket to integrate it into our

// runloop. We bind to port 0, which causes the kernel to give us

// any free port, then use getsockname to find out what port number we

// actually got.

port = 0;

fd = socket(AF_INET, SOCK_STREAM, 0);

success = (fd != -1);

if (success) {

memset(&addr, 0, sizeof(addr));

addr.sin_len = sizeof(addr);

addr.sin_family = AF_INET;

addr.sin_port = 0;

addr.sin_addr.s_addr = INADDR_ANY;

err = bind(fd, (const struct sockaddr *) &addr, sizeof(addr));

success = (err == 0);

}

if (success) {

err = listen(fd, 5);

success = (err == 0);

}

if (success) {

socklen_t addrLen;

addrLen = sizeof(addr);

err = getsockname(fd, (struct sockaddr *) &addr, &addrLen);

success = (err == 0);

if (success) {

assert(addrLen == sizeof(addr));

port = ntohs(addr.sin_port);

}

}

if (success) {

CFSocketContext context = { 0, (__bridge void *) self, NULL, NULL, NULL };

assert(self->_listeningSocket == NULL);

self->_listeningSocket = CFSocketCreateWithNative(

NULL,

fd,

kCFSocketAcceptCallBack,

AcceptCallback,

&context

);

success = (self->_listeningSocket != NULL);

if (success) {

CFRunLoopSourceRef rls;

fd = -1; // listeningSocket is now responsible for closing fd

rls = CFSocketCreateRunLoopSource(NULL, self.listeningSocket, 0);

assert(rls != NULL);

CFRunLoopAddSource(CFRunLoopGetCurrent(), rls, kCFRunLoopDefaultMode);

CFRelease(rls);

}

}

// Now register our service with Bonjour. See the comments in -netService:didNotPublish:

// for more info about this simplifying assumption.

if (success) {

self.netService = [[NSNetService alloc] initWithDomain:@"local." type:@"_x-SNSUpload._tcp." name:@"Test" port:port];

success = (self.netService != nil);

}

if (success) {

self.netService.delegate = self;

[self.netService publishWithOptions:NSNetServiceNoAutoRename];

// continues in -netServiceDidPublish: or -netService:didNotPublish: ...

}

// Clean up after failure.

if ( success ) {

assert(port != 0);

[self serverDidStartOnPort:port];

} else {

[self stopServer:@"Start failed"];

if (fd != -1) {

junk = close(fd);

assert(junk == 0);

}

}

}

- (void)stopServer:(NSString *)reason

{

if (self.isReceiving) {

[self stopReceiveWithStatus:@"Cancelled"];

}

if (self.netService != nil) {

[self.netService stop];

self.netService = nil;

}

if (self.listeningSocket != NULL) {

CFSocketInvalidate(self.listeningSocket);

CFRelease(self->_listeningSocket);

self->_listeningSocket = NULL;

}

[self serverDidStopWithReason:reason];

}

#pragma mark * Actions

- (IBAction)startOrStopAction:(id)sender

{

#pragma unused(sender)

if (self.isStarted) {

[self stopServer:nil];

} else {

[self startServer];

}

}

#pragma mark * View controller boilerplate

- (void)viewDidLoad

{

[super viewDidLoad];

assert(self.imageView != nil);

assert(self.statusLabel != nil);

assert(self.activityIndicator != nil);

assert(self.startOrStopButton != nil);

self.activityIndicator.hidden = YES;

self.statusLabel.text = @"Tap Start to start the server";

}

- (void)viewDidUnload

{

[super viewDidUnload];

self.imageView = nil;

self.statusLabel = nil;

self.activityIndicator = nil;

self.startOrStopButton = nil;

}

- (void)dealloc

{

[self stopServer:nil];

}

@end