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HTTPServer.m
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HTTPServer.m
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//
// HTTPServer.m
// TextTransfer
//
// Created by Matt Gallagher on 2009/07/13.
// Copyright 2009 Matt Gallagher. All rights reserved.
//
// Permission is given to use this source code file, free of charge, in any
// project, commercial or otherwise, entirely at your risk, with the condition
// that any redistribution (in part or whole) of source code must retain
// this copyright and permission notice. Attribution in compiled projects is
// appreciated but not required.
//
#import "HTTPServer.h"
#import "SynthesizeSingleton.h"
#import <sys/socket.h>
#import <netinet/in.h>
#if TARGET_OS_IPHONE
#import <CFNetwork/CFNetwork.h>
#endif
#import "HTTPResponseHandler.h"
NSString * const HTTPServerNotificationStateChanged = @"ServerNotificationStateChanged";
//
// Internal methods and properties:
// The "lastError" and "state" are only writable by the server itself.
//
@interface HTTPServer ()
@property (nonatomic, readwrite, retain) NSError *lastError;
@property (readwrite, assign) HTTPServerState state;
@end
@implementation HTTPServer
@synthesize lastError;
@synthesize state;
SYNTHESIZE_SINGLETON_FOR_CLASS(HTTPServer);
//
// init
//
// Set the initial state and allocate the responseHandlers and incomingRequests
// collections.
//
// returns the initialized server object.
//
- (id)init
{
self = [super init];
if (self != nil)
{
self.state = SERVER_STATE_IDLE;
responseHandlers = [[NSMutableSet alloc] init];
incomingRequests =
CFDictionaryCreateMutable(
kCFAllocatorDefault,
0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
}
return self;
}
-(void)startBonjourServices
{
socks5NetService = [[NSNetService alloc] initWithDomain:@"" type:@"_socks5._tcp."
name:@"" port:SOCKS_PROXY_PORT];
socks5NetService.delegate = self;
[socks5NetService publish];
pacFileServerNetService = [[NSNetService alloc] initWithDomain:@"" type:@"_pacfileserver._tcp."
name:@"" port:self.httpServerPort];
pacFileServerNetService.delegate = self;
[pacFileServerNetService publish];
}
-(void)stopBonjourServices
{
[socks5NetService stop];
[socks5NetService release];
socks5NetService = nil;
[pacFileServerNetService stop];
[pacFileServerNetService release];
pacFileServerNetService = nil;
}
//
// setLastError:
//
// Custom setter method. Stops the server and
//
// Parameters:
// anError - the new error value (nil to clear)
//
- (void)setLastError:(NSError *)anError
{
[anError retain];
[lastError release];
lastError = anError;
if (lastError == nil)
{
return;
}
[self stop];
self.state = SERVER_STATE_IDLE;
NSLog(@"HTTPServer error: %@", self.lastError);
}
//
// errorWithName:
//
// Stops the server and sets the last error to "errorName", localized using the
// HTTPServerErrors.strings file (if present).
//
// Parameters:
// errorName - the description used for the error
//
- (void)errorWithName:(NSString *)errorName
{
self.lastError = [NSError
errorWithDomain:@"HTTPServerError"
code:0
userInfo:
[NSDictionary dictionaryWithObject:
NSLocalizedStringFromTable(
errorName,
@"",
@"HTTPServerErrors")
forKey:NSLocalizedDescriptionKey]];
}
//
// setState:
//
// Changes the server state and posts a notification (if the state changes).
//
// Parameters:
// newState - the new state for the server
//
- (void)setState:(HTTPServerState)newState
{
if (state == newState)
{
return;
}
state = newState;
[[NSNotificationCenter defaultCenter]
postNotificationName:HTTPServerNotificationStateChanged
object:self];
}
//
// start
//
// Creates the socket and starts listening for connections on it.
//
- (void)start
{
self.lastError = nil;
self.state = SERVER_STATE_STARTING;
socket = CFSocketCreate(kCFAllocatorDefault, PF_INET, SOCK_STREAM,
IPPROTO_TCP, 0, NULL, NULL);
if (!socket)
{
[self errorWithName:@"Unable to create socket."];
return;
}
int reuse = true;
int fileDescriptor = CFSocketGetNative(socket);
if (setsockopt(fileDescriptor, SOL_SOCKET, SO_REUSEADDR,
(void *)&reuse, sizeof(int)) != 0)
{
[self errorWithName:@"Unable to set socket options."];
return;
}
struct sockaddr_in address;
memset(&address, 0, sizeof(address));
address.sin_len = sizeof(address);
address.sin_family = AF_INET;
address.sin_addr.s_addr = htonl(INADDR_ANY);
address.sin_port = htons(self.httpServerPort);
CFDataRef addressData =
CFDataCreate(NULL, (const UInt8 *)&address, sizeof(address));
[(id)addressData autorelease];
if (CFSocketSetAddress(socket, addressData) != kCFSocketSuccess)
{
[self errorWithName:@"Unable to bind socket to address."];
return;
}
listeningHandle = [[NSFileHandle alloc]
initWithFileDescriptor:fileDescriptor
closeOnDealloc:YES];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(receiveIncomingConnectionNotification:)
name:NSFileHandleConnectionAcceptedNotification
object:nil];
[listeningHandle acceptConnectionInBackgroundAndNotify];
self.state = SERVER_STATE_RUNNING;
[self startBonjourServices];
}
//
// stopReceivingForFileHandle:close:
//
// If a file handle is accumulating the header for a new connection, this
// method will close the handle, stop listening to it and release the
// accumulated memory.
//
// Parameters:
// incomingFileHandle - the file handle for the incoming request
// closeFileHandle - if YES, the file handle will be closed, if no it is
// assumed that an HTTPResponseHandler will close it when done.
//
- (void)stopReceivingForFileHandle:(NSFileHandle *)incomingFileHandle
close:(BOOL)closeFileHandle
{
if (closeFileHandle)
{
[incomingFileHandle closeFile];
}
[[NSNotificationCenter defaultCenter]
removeObserver:self
name:NSFileHandleDataAvailableNotification
object:incomingFileHandle];
CFDictionaryRemoveValue(incomingRequests, incomingFileHandle);
}
//
// stop
//
// Stops the server.
//
- (void)stop
{
self.state = SERVER_STATE_STOPPING;
[[NSNotificationCenter defaultCenter]
removeObserver:self
name:NSFileHandleConnectionAcceptedNotification
object:nil];
[responseHandlers removeAllObjects];
[listeningHandle closeFile];
[listeningHandle release];
listeningHandle = nil;
for (NSFileHandle *incomingFileHandle in
[[(NSDictionary *)incomingRequests copy] autorelease])
{
[self stopReceivingForFileHandle:incomingFileHandle close:YES];
}
if (socket)
{
CFSocketInvalidate(socket);
CFRelease(socket);
socket = nil;
}
self.state = SERVER_STATE_IDLE;
[self stopBonjourServices];
}
//
// receiveIncomingConnectionNotification:
//
// Receive the notification for a new incoming request. This method starts
// receiving data from the incoming request's file handle and creates a
// new CFHTTPMessageRef to store the incoming data..
//
// Parameters:
// notification - the new connection notification
//
- (void)receiveIncomingConnectionNotification:(NSNotification *)notification
{
NSDictionary *userInfo = [notification userInfo];
NSFileHandle *incomingFileHandle =
[userInfo objectForKey:NSFileHandleNotificationFileHandleItem];
if(incomingFileHandle)
{
CFDictionaryAddValue(
incomingRequests,
incomingFileHandle,
[(id)CFHTTPMessageCreateEmpty(kCFAllocatorDefault, TRUE) autorelease]);
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(receiveIncomingDataNotification:)
name:NSFileHandleDataAvailableNotification
object:incomingFileHandle];
[incomingFileHandle waitForDataInBackgroundAndNotify];
}
[listeningHandle acceptConnectionInBackgroundAndNotify];
}
//
// receiveIncomingDataNotification:
//
// Receive new data for an incoming connection.
//
// Once enough data is received to fully parse the HTTP headers,
// a HTTPResponseHandler will be spawned to generate a response.
//
// Parameters:
// notification - data received notification
//
- (void)receiveIncomingDataNotification:(NSNotification *)notification
{
NSFileHandle *incomingFileHandle = [notification object];
NSData *data = [incomingFileHandle availableData];
if ([data length] == 0)
{
[self stopReceivingForFileHandle:incomingFileHandle close:NO];
return;
}
CFHTTPMessageRef incomingRequest =
(CFHTTPMessageRef)CFDictionaryGetValue(incomingRequests, incomingFileHandle);
if (!incomingRequest)
{
[self stopReceivingForFileHandle:incomingFileHandle close:YES];
return;
}
if (!CFHTTPMessageAppendBytes(
incomingRequest,
[data bytes],
[data length]))
{
[self stopReceivingForFileHandle:incomingFileHandle close:YES];
return;
}
if(CFHTTPMessageIsHeaderComplete(incomingRequest))
{
HTTPResponseHandler *handler =
[HTTPResponseHandler
handlerForRequest:incomingRequest
fileHandle:incomingFileHandle
server:self];
[responseHandlers addObject:handler];
[self stopReceivingForFileHandle:incomingFileHandle close:NO];
[handler startResponse];
return;
}
[incomingFileHandle waitForDataInBackgroundAndNotify];
}
//
// closeHandler:
//
// Shuts down a response handler and removes it from the set of handlers.
//
// Parameters:
// aHandler - the handler to shut down.
//
- (void)closeHandler:(HTTPResponseHandler *)aHandler
{
[aHandler endResponse];
[responseHandlers removeObject:aHandler];
}
- (UInt32)httpServerPort
{
return HTTP_SERVER_PORT;
}
@end